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Diffstat (limited to 'spectro/mongoose.c')
| -rw-r--r-- | spectro/mongoose.c | 4819 |
1 files changed, 4819 insertions, 0 deletions
diff --git a/spectro/mongoose.c b/spectro/mongoose.c new file mode 100644 index 0000000..e1df94a --- /dev/null +++ b/spectro/mongoose.c @@ -0,0 +1,4819 @@ +// Copyright (c) 2004-2012 Sergey Lyubka +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +#if defined(_WIN32) +#define _CRT_SECURE_NO_WARNINGS // Disable deprecation warning in VS2005 +#else +#ifdef __linux__ +#define _XOPEN_SOURCE 600 // For flockfile() on Linux +#endif +#define _LARGEFILE_SOURCE // Enable 64-bit file offsets +#define __STDC_FORMAT_MACROS // <inttypes.h> wants this for C++ +#define __STDC_LIMIT_MACROS // C++ wants that for INT64_MAX +#endif + +//#ifdef WIN32_LEAN_AND_MEAN +//#undef WIN32_LEAN_AND_MEAN // Disable WIN32_LEAN_AND_MEAN, if necessary +//#endif + +#define WIN32_LEAN_AND_MEAN // Set WIN32_LEAN_AND_MEAN to prevent winsock2.h problem + +#if defined(__SYMBIAN32__) +#define NO_SSL // SSL is not supported +#define NO_CGI // CGI is not supported +#define PATH_MAX FILENAME_MAX +#endif // __SYMBIAN32__ + +#ifndef _WIN32_WCE // Some ANSI #includes are not available on Windows CE +#include <sys/types.h> +#include <sys/stat.h> +#include <errno.h> +#include <signal.h> +#include <fcntl.h> +#endif // !_WIN32_WCE + +#include <time.h> +#include <stdlib.h> +#include <stdarg.h> +#include <assert.h> +#include <string.h> +#include <ctype.h> +#include <limits.h> +#include <stddef.h> +#include <stdio.h> + +#if defined(_WIN32) && !defined(__SYMBIAN32__) // Windows specific +#if _WIN32_WINNT < 0x0400 +# define _WIN32_WINNT 0x0400 // To make it link in VS2005 +#endif +#ifndef WIN32 +# define WIN32 +#endif +#include <winsock2.h> +#include <windows.h> +#include <ws2tcpip.h> + +#ifndef PATH_MAX +# define PATH_MAX MAX_PATH +#endif + +#ifndef _WIN32_WCE +# include <process.h> +# include <direct.h> +# include <io.h> +#else // _WIN32_WCE +# define NO_CGI // WinCE has no pipes + +typedef long off_t; + +# define errno GetLastError() +# define strerror(x) _ultoa(x, (char *) _alloca(sizeof(x) *3 ), 10) +#endif // _WIN32_WCE + +#define MAKEUQUAD(lo, hi) ((uint64_t)(((uint32_t)(lo)) | \ + ((uint64_t)((uint32_t)(hi))) << 32)) +#define RATE_DIFF 10000000 // 100 nsecs +#define EPOCH_DIFF MAKEUQUAD(0xd53e8000, 0x019db1de) +#define SYS2UNIX_TIME(lo, hi) \ + (time_t) ((MAKEUQUAD((lo), (hi)) - EPOCH_DIFF) / RATE_DIFF) + +// Visual Studio 6 does not know __func__ or __FUNCTION__ +// The rest of MS compilers use __FUNCTION__, not C99 __func__ +// Also use _strtoui64 on modern M$ compilers +#if defined(_MSC_VER) && _MSC_VER < 1300 +# define STRX(x) #x +# define STR(x) STRX(x) +# define __func__ "line " STR(__LINE__) +# define strtoull(x, y, z) strtoul(x, y, z) +# define strtoll(x, y, z) strtol(x, y, z) +#else +# define __func__ __FUNCTION__ +# define strtoull(x, y, z) _strtoui64(x, y, z) +# define strtoll(x, y, z) _strtoi64(x, y, z) +#endif // _MSC_VER + +#define ERRNO GetLastError() +#define NO_SOCKLEN_T +#define SSL_LIB "ssleay32.dll" +#define CRYPTO_LIB "libeay32.dll" +#define O_NONBLOCK 0 +#if !defined(EWOULDBLOCK) +# define EWOULDBLOCK WSAEWOULDBLOCK +#endif // !EWOULDBLOCK +#define _POSIX_ +#define INT64_FMT "I64d" + +#define WINCDECL __cdecl +#define SHUT_WR 1 +#define snprintf _snprintf +#define vsnprintf _vsnprintf +#define mg_sleep(x) Sleep(x) + +#define pipe(x) _pipe(x, MG_BUF_LEN, _O_BINARY) +#ifndef popen +# define popen(x, y) _popen(x, y) +# define pclose(x) _pclose(x) +#endif +#define close(x) _close(x) +#define dlsym(x,y) GetProcAddress((HINSTANCE) (x), (y)) +#define RTLD_LAZY 0 +#define fseeko(x, y, z) _lseeki64(_fileno(x), (y), (z)) +#define fdopen(x, y) _fdopen((x), (y)) +#define write(x, y, z) _write((x), (y), (unsigned) z) +#define read(x, y, z) _read((x), (y), (unsigned) z) +#define flockfile(x) EnterCriticalSection(&global_log_file_lock) +#define funlockfile(x) LeaveCriticalSection(&global_log_file_lock) +#define sleep(x) Sleep((x) * 1000) + +#if !defined(fileno) +#define fileno(x) _fileno(x) +#endif // !fileno MINGW #defines fileno + +typedef HANDLE pthread_mutex_t; +typedef struct {HANDLE signal, broadcast;} pthread_cond_t; +typedef DWORD pthread_t; +#define pid_t HANDLE // MINGW typedefs pid_t to int. Using #define here. + +static int pthread_mutex_lock(pthread_mutex_t *); +static int pthread_mutex_unlock(pthread_mutex_t *); +static FILE *mg_fopen(const char *path, const char *mode); + +#if defined(HAVE_STDINT) || defined(INT64_MAX) +#include <stdint.h> +#else +typedef unsigned int uint32_t; +typedef unsigned short uint16_t; +typedef unsigned __int64 uint64_t; +typedef __int64 int64_t; +#define INT64_MAX 9223372036854775807 +#endif // HAVE_STDINT + +// POSIX dirent interface +struct dirent { + char d_name[PATH_MAX]; +}; + +typedef struct DIR { + HANDLE handle; + WIN32_FIND_DATAW info; + struct dirent result; +} DIR; + +// Mark required libraries +#pragma comment(lib, "Ws2_32.lib") + +#else // UNIX specific +#include <sys/wait.h> +#include <sys/socket.h> +#include <sys/select.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <sys/time.h> +#include <stdint.h> +#include <inttypes.h> +#include <netdb.h> + +#include <pwd.h> +#include <unistd.h> +#include <dirent.h> +#if !defined(NO_SSL_DL) && !defined(NO_SSL) +#include <dlfcn.h> +#endif +#include <pthread.h> +#if defined(__MACH__) +#define SSL_LIB "libssl.dylib" +#define CRYPTO_LIB "libcrypto.dylib" +#else +#if !defined(SSL_LIB) +#define SSL_LIB "libssl.so" +#endif +#if !defined(CRYPTO_LIB) +#define CRYPTO_LIB "libcrypto.so" +#endif +#endif +#ifndef O_BINARY +#define O_BINARY 0 +#endif // O_BINARY +#define closesocket(a) close(a) +#define mg_fopen(x, y) fopen(x, y) +#define mg_mkdir(x, y) mkdir(x, y) +#define mg_remove(x) remove(x) +#define mg_rename(x, y) rename(x, y) +#define mg_sleep(x) usleep((x) * 1000) +#define ERRNO errno +#define INVALID_SOCKET (-1) +#define INT64_FMT PRId64 +typedef int SOCKET; +#define WINCDECL + +#endif // End of Windows and UNIX specific includes + +#include "mongoose.h" + +#define MONGOOSE_VERSION "3.3" +#define PASSWORDS_FILE_NAME ".htpasswd" +#define CGI_ENVIRONMENT_SIZE 4096 +#define MAX_CGI_ENVIR_VARS 64 +#define MG_BUF_LEN 8192 +#define MAX_REQUEST_SIZE 16384 +#define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0])) + +#ifdef _WIN32 +static CRITICAL_SECTION global_log_file_lock; +static pthread_t pthread_self(void) { + return GetCurrentThreadId(); +} +#endif // _WIN32 + +#ifdef DEBUG_TRACE +#undef DEBUG_TRACE +#define DEBUG_TRACE(x) +#else +#if defined(DEBUG) +#define DEBUG_TRACE(x) do { \ + flockfile(stdout); \ + printf("*** %lu.%p.%s.%d: ", \ + (unsigned long) time(NULL), (void *) pthread_self(), \ + __func__, __LINE__); \ + printf x; \ + putchar('\n'); \ + fflush(stdout); \ + funlockfile(stdout); \ +} while (0) +#else +#define DEBUG_TRACE(x) +#endif // DEBUG +#endif // DEBUG_TRACE + +// Darwin prior to 7.0 and Win32 do not have socklen_t +#ifdef NO_SOCKLEN_T +typedef int socklen_t; +#endif // NO_SOCKLEN_T +#define _DARWIN_UNLIMITED_SELECT + +#if !defined(MSG_NOSIGNAL) +#define MSG_NOSIGNAL 0 +#endif + +#if !defined(SOMAXCONN) +#define SOMAXCONN 100 +#endif + +#if !defined(PATH_MAX) +#define PATH_MAX 4096 +#endif + +static const char *http_500_error = "Internal Server Error"; + +// Snatched from OpenSSL includes. I put the prototypes here to be independent +// from the OpenSSL source installation. Having this, mongoose + SSL can be +// built on any system with binary SSL libraries installed. +typedef struct ssl_st SSL; +typedef struct ssl_method_st SSL_METHOD; +typedef struct ssl_ctx_st SSL_CTX; + +#define SSL_ERROR_WANT_READ 2 +#define SSL_ERROR_WANT_WRITE 3 +#define SSL_FILETYPE_PEM 1 +#define CRYPTO_LOCK 1 + +#if defined(NO_SSL_DL) +extern void SSL_free(SSL *); +extern int SSL_accept(SSL *); +extern int SSL_connect(SSL *); +extern int SSL_read(SSL *, void *, int); +extern int SSL_write(SSL *, const void *, int); +extern int SSL_get_error(const SSL *, int); +extern int SSL_set_fd(SSL *, int); +extern SSL *SSL_new(SSL_CTX *); +extern SSL_CTX *SSL_CTX_new(SSL_METHOD *); +extern SSL_METHOD *SSLv23_server_method(void); +extern SSL_METHOD *SSLv23_client_method(void); +extern int SSL_library_init(void); +extern void SSL_load_error_strings(void); +extern int SSL_CTX_use_PrivateKey_file(SSL_CTX *, const char *, int); +extern int SSL_CTX_use_certificate_file(SSL_CTX *, const char *, int); +extern int SSL_CTX_use_certificate_chain_file(SSL_CTX *, const char *); +extern void SSL_CTX_set_default_passwd_cb(SSL_CTX *, mg_callback_t); +extern void SSL_CTX_free(SSL_CTX *); +extern unsigned long ERR_get_error(void); +extern char *ERR_error_string(unsigned long, char *); +extern int CRYPTO_num_locks(void); +extern void CRYPTO_set_locking_callback(void (*)(int, int, const char *, int)); +extern void CRYPTO_set_id_callback(unsigned long (*)(void)); +#else +// Dynamically loaded SSL functionality +struct ssl_func { + const char *name; // SSL function name + void (*ptr)(void); // Function pointer +}; + +#define SSL_free (* (void (*)(SSL *)) ssl_sw[0].ptr) +#define SSL_accept (* (int (*)(SSL *)) ssl_sw[1].ptr) +#define SSL_connect (* (int (*)(SSL *)) ssl_sw[2].ptr) +#define SSL_read (* (int (*)(SSL *, void *, int)) ssl_sw[3].ptr) +#define SSL_write (* (int (*)(SSL *, const void *,int)) ssl_sw[4].ptr) +#define SSL_get_error (* (int (*)(SSL *, int)) ssl_sw[5].ptr) +#define SSL_set_fd (* (int (*)(SSL *, SOCKET)) ssl_sw[6].ptr) +#define SSL_new (* (SSL * (*)(SSL_CTX *)) ssl_sw[7].ptr) +#define SSL_CTX_new (* (SSL_CTX * (*)(SSL_METHOD *)) ssl_sw[8].ptr) +#define SSLv23_server_method (* (SSL_METHOD * (*)(void)) ssl_sw[9].ptr) +#define SSL_library_init (* (int (*)(void)) ssl_sw[10].ptr) +#define SSL_CTX_use_PrivateKey_file (* (int (*)(SSL_CTX *, \ + const char *, int)) ssl_sw[11].ptr) +#define SSL_CTX_use_certificate_file (* (int (*)(SSL_CTX *, \ + const char *, int)) ssl_sw[12].ptr) +#define SSL_CTX_set_default_passwd_cb \ + (* (void (*)(SSL_CTX *, mg_callback_t)) ssl_sw[13].ptr) +#define SSL_CTX_free (* (void (*)(SSL_CTX *)) ssl_sw[14].ptr) +#define SSL_load_error_strings (* (void (*)(void)) ssl_sw[15].ptr) +#define SSL_CTX_use_certificate_chain_file \ + (* (int (*)(SSL_CTX *, const char *)) ssl_sw[16].ptr) +#define SSLv23_client_method (* (SSL_METHOD * (*)(void)) ssl_sw[17].ptr) + +#define CRYPTO_num_locks (* (int (*)(void)) crypto_sw[0].ptr) +#define CRYPTO_set_locking_callback \ + (* (void (*)(void (*)(int, int, const char *, int))) crypto_sw[1].ptr) +#define CRYPTO_set_id_callback \ + (* (void (*)(unsigned long (*)(void))) crypto_sw[2].ptr) +#define ERR_get_error (* (unsigned long (*)(void)) crypto_sw[3].ptr) +#define ERR_error_string (* (char * (*)(unsigned long,char *)) crypto_sw[4].ptr) + +// set_ssl_option() function updates this array. +// It loads SSL library dynamically and changes NULLs to the actual addresses +// of respective functions. The macros above (like SSL_connect()) are really +// just calling these functions indirectly via the pointer. +static struct ssl_func ssl_sw[] = { + {"SSL_free", NULL}, + {"SSL_accept", NULL}, + {"SSL_connect", NULL}, + {"SSL_read", NULL}, + {"SSL_write", NULL}, + {"SSL_get_error", NULL}, + {"SSL_set_fd", NULL}, + {"SSL_new", NULL}, + {"SSL_CTX_new", NULL}, + {"SSLv23_server_method", NULL}, + {"SSL_library_init", NULL}, + {"SSL_CTX_use_PrivateKey_file", NULL}, + {"SSL_CTX_use_certificate_file",NULL}, + {"SSL_CTX_set_default_passwd_cb",NULL}, + {"SSL_CTX_free", NULL}, + {"SSL_load_error_strings", NULL}, + {"SSL_CTX_use_certificate_chain_file", NULL}, + {"SSLv23_client_method", NULL}, + {NULL, NULL} +}; + +// Similar array as ssl_sw. These functions could be located in different lib. +#if !defined(NO_SSL) +static struct ssl_func crypto_sw[] = { + {"CRYPTO_num_locks", NULL}, + {"CRYPTO_set_locking_callback", NULL}, + {"CRYPTO_set_id_callback", NULL}, + {"ERR_get_error", NULL}, + {"ERR_error_string", NULL}, + {NULL, NULL} +}; +#endif // NO_SSL +#endif // NO_SSL_DL + +static const char *month_names[] = { + "Jan", "Feb", "Mar", "Apr", "May", "Jun", + "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" +}; + +// Unified socket address. For IPv6 support, add IPv6 address structure +// in the union u. +union usa { + struct sockaddr sa; + struct sockaddr_in sin; +#if defined(USE_IPV6) + struct sockaddr_in6 sin6; +#endif +}; + +// Describes a string (chunk of memory). +struct vec { + const char *ptr; + size_t len; +}; + +// Structure used by mg_stat() function. Uses 64 bit file length. +struct mgstat { + int is_directory; // Directory marker + int64_t size; // File size + time_t mtime; // Modification time +}; + +// Describes listening socket, or socket which was accept()-ed by the master +// thread and queued for future handling by the worker thread. +struct socket { + struct socket *next; // Linkage + SOCKET sock; // Listening socket + union usa lsa; // Local socket address + union usa rsa; // Remote socket address + int is_ssl; // Is socket SSL-ed +}; + +// NOTE(lsm): this enum shoulds be in sync with the config_options below. +enum { + CGI_EXTENSIONS, CGI_ENVIRONMENT, PUT_DELETE_PASSWORDS_FILE, CGI_INTERPRETER, + PROTECT_URI, AUTHENTICATION_DOMAIN, SSI_EXTENSIONS, THROTTLE, + ACCESS_LOG_FILE, ENABLE_DIRECTORY_LISTING, ERROR_LOG_FILE, + GLOBAL_PASSWORDS_FILE, INDEX_FILES, ENABLE_KEEP_ALIVE, ACCESS_CONTROL_LIST, + EXTRA_MIME_TYPES, LISTENING_PORTS, DOCUMENT_ROOT, SSL_CERTIFICATE, + NUM_THREADS, RUN_AS_USER, REWRITE, HIDE_FILES, + NUM_OPTIONS +}; + +static const char *config_options[] = { + "C", "cgi_pattern", "**.cgi$|**.pl$|**.php$", + "E", "cgi_environment", NULL, + "G", "put_delete_passwords_file", NULL, + "I", "cgi_interpreter", NULL, + "P", "protect_uri", NULL, + "R", "authentication_domain", "mydomain.com", + "S", "ssi_pattern", "**.shtml$|**.shtm$", + "T", "throttle", NULL, + "a", "access_log_file", NULL, + "d", "enable_directory_listing", "yes", + "e", "error_log_file", NULL, + "g", "global_passwords_file", NULL, + "i", "index_files", "index.html,index.htm,index.cgi,index.shtml,index.php", + "k", "enable_keep_alive", "no", + "l", "access_control_list", NULL, + "m", "extra_mime_types", NULL, + "p", "listening_ports", "8080", + "r", "document_root", ".", + "s", "ssl_certificate", NULL, + "t", "num_threads", "20", + "u", "run_as_user", NULL, + "w", "url_rewrite_patterns", NULL, + "x", "hide_files_patterns", NULL, + NULL +}; +#define ENTRIES_PER_CONFIG_OPTION 3 + +struct mg_context { + volatile int stop_flag; // Should we stop event loop + SSL_CTX *ssl_ctx; // SSL context + SSL_CTX *client_ssl_ctx; // Client SSL context + char *config[NUM_OPTIONS]; // Mongoose configuration parameters + mg_callback_t user_callback; // User-defined callback function + void *user_data; // User-defined data + + struct socket *listening_sockets; + + volatile int num_threads; // Number of threads + pthread_mutex_t mutex; // Protects (max|num)_threads + pthread_cond_t cond; // Condvar for tracking workers terminations + + struct socket queue[20]; // Accepted sockets + volatile int sq_head; // Head of the socket queue + volatile int sq_tail; // Tail of the socket queue + pthread_cond_t sq_full; // Signaled when socket is produced + pthread_cond_t sq_empty; // Signaled when socket is consumed +}; + +struct mg_connection { + struct mg_request_info request_info; + struct mg_context *ctx; + SSL *ssl; // SSL descriptor + struct socket client; // Connected client + time_t birth_time; // Time when request was received + int64_t num_bytes_sent; // Total bytes sent to client + int64_t content_len; // Content-Length header value + int64_t consumed_content; // How many bytes of content have been read + char *buf; // Buffer for received data + char *path_info; // PATH_INFO part of the URL + char *log_message; // Placeholder for the mongoose error log message + int must_close; // 1 if connection must be closed + int buf_size; // Buffer size + int request_len; // Size of the request + headers in a buffer + int data_len; // Total size of data in a buffer + int status_code; // HTTP reply status code, e.g. 200 + int throttle; // Throttling, bytes/sec. <= 0 means no throttle + time_t last_throttle_time; // Last time throttled data was sent + int64_t last_throttle_bytes;// Bytes sent this second +}; + +const char **mg_get_valid_option_names(void) { + return config_options; +} + +static void *call_user(struct mg_connection *conn, enum mg_event event) { + return conn == NULL || conn->ctx == NULL || conn->ctx->user_callback == NULL ? + NULL : conn->ctx->user_callback(event, conn); +} + +void *mg_get_user_data(struct mg_connection *conn) { + return conn != NULL && conn->ctx != NULL ? conn->ctx->user_data : NULL; +} + +const char *mg_get_log_message(const struct mg_connection *conn) { + return conn == NULL ? NULL : conn->log_message; +} + +int mg_get_reply_status_code(const struct mg_connection *conn) { + return conn == NULL ? -1 : conn->status_code; +} + +void *mg_get_ssl_context(const struct mg_connection *conn) { + return conn == NULL || conn->ctx == NULL ? NULL : conn->ctx->ssl_ctx; +} + +static int get_option_index(const char *name) { + int i; + + for (i = 0; config_options[i] != NULL; i += ENTRIES_PER_CONFIG_OPTION) { + if (strcmp(config_options[i], name) == 0 || + strcmp(config_options[i + 1], name) == 0) { + return i / ENTRIES_PER_CONFIG_OPTION; + } + } + return -1; +} + +const char *mg_get_option(const struct mg_context *ctx, const char *name) { + int i; + if ((i = get_option_index(name)) == -1) { + return NULL; + } else if (ctx->config[i] == NULL) { + return ""; + } else { + return ctx->config[i]; + } +} + +static void sockaddr_to_string(char *buf, size_t len, + const union usa *usa) { + buf[0] = '\0'; +#if defined(USE_IPV6) + inet_ntop(usa->sa.sa_family, usa->sa.sa_family == AF_INET ? + (void *) &usa->sin.sin_addr : + (void *) &usa->sin6.sin6_addr, buf, len); +#elif defined(_WIN32) + // Only Windoze Vista (and newer) have inet_ntop() + strncpy(buf, inet_ntoa(usa->sin.sin_addr), len); +#else + inet_ntop(usa->sa.sa_family, (void *) &usa->sin.sin_addr, buf, len); +#endif +} + +static void cry(struct mg_connection *conn, + PRINTF_FORMAT_STRING(const char *fmt), ...) PRINTF_ARGS(2, 3); + +// Print error message to the opened error log stream. +static void cry(struct mg_connection *conn, const char *fmt, ...) { + char buf[MG_BUF_LEN], src_addr[20]; + va_list ap; + FILE *fp; + time_t timestamp; + + va_start(ap, fmt); + (void) vsnprintf(buf, sizeof(buf), fmt, ap); + va_end(ap); + + // Do not lock when getting the callback value, here and below. + // I suppose this is fine, since function cannot disappear in the + // same way string option can. + conn->log_message = buf; + if (call_user(conn, MG_EVENT_LOG) == NULL) { + fp = conn->ctx == NULL || conn->ctx->config[ERROR_LOG_FILE] == NULL ? NULL : + mg_fopen(conn->ctx->config[ERROR_LOG_FILE], "a+"); + + if (fp != NULL) { + flockfile(fp); + timestamp = time(NULL); + + sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa); + fprintf(fp, "[%010lu] [error] [client %s] ", (unsigned long) timestamp, + src_addr); + + if (conn->request_info.request_method != NULL) { + fprintf(fp, "%s %s: ", conn->request_info.request_method, + conn->request_info.uri); + } + + (void) fprintf(fp, "%s", buf); + fputc('\n', fp); + funlockfile(fp); + if (fp != stderr) { + fclose(fp); + } + } + } + conn->log_message = NULL; +} + +// Return fake connection structure. Used for logging, if connection +// is not applicable at the moment of logging. +static struct mg_connection *fc(struct mg_context *ctx) { + static struct mg_connection fake_connection; + fake_connection.ctx = ctx; + return &fake_connection; +} + +const char *mg_version(void) { + return MONGOOSE_VERSION; +} + +const struct mg_request_info * +mg_get_request_info(const struct mg_connection *conn) { + return &conn->request_info; +} + +static void mg_strlcpy(register char *dst, register const char *src, size_t n) { + for (; *src != '\0' && n > 1; n--) { + *dst++ = *src++; + } + *dst = '\0'; +} + +static int lowercase(const char *s) { + return tolower(* (const unsigned char *) s); +} + +static int mg_strncasecmp(const char *s1, const char *s2, size_t len) { + int diff = 0; + + if (len > 0) + do { + diff = lowercase(s1++) - lowercase(s2++); + } while (diff == 0 && s1[-1] != '\0' && --len > 0); + + return diff; +} + +static int mg_strcasecmp(const char *s1, const char *s2) { + int diff; + + do { + diff = lowercase(s1++) - lowercase(s2++); + } while (diff == 0 && s1[-1] != '\0'); + + return diff; +} + +static char * mg_strndup(const char *ptr, size_t len) { + char *p; + + if ((p = (char *) malloc(len + 1)) != NULL) { + mg_strlcpy(p, ptr, len + 1); + } + + return p; +} + +static char * mg_strdup(const char *str) { + return mg_strndup(str, strlen(str)); +} + +// Like snprintf(), but never returns negative value, or a value +// that is larger than a supplied buffer. +// Thanks to Adam Zeldis to pointing snprintf()-caused vulnerability +// in his audit report. +static int mg_vsnprintf(struct mg_connection *conn, char *buf, size_t buflen, + const char *fmt, va_list ap) { + int n; + + if (buflen == 0) + return 0; + + n = vsnprintf(buf, buflen, fmt, ap); + + if (n < 0) { + cry(conn, "vsnprintf error"); + n = 0; + } else if (n >= (int) buflen) { + cry(conn, "truncating vsnprintf buffer: [%.*s]", + n > 200 ? 200 : n, buf); + n = (int) buflen - 1; + } + buf[n] = '\0'; + + return n; +} + +static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen, + PRINTF_FORMAT_STRING(const char *fmt), ...) + PRINTF_ARGS(4, 5); + +static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen, + const char *fmt, ...) { + va_list ap; + int n; + + va_start(ap, fmt); + n = mg_vsnprintf(conn, buf, buflen, fmt, ap); + va_end(ap); + + return n; +} + +// Skip the characters until one of the delimiters characters found. +// 0-terminate resulting word. Skip the delimiter and following whitespaces if any. +// Advance pointer to buffer to the next word. Return found 0-terminated word. +// Delimiters can be quoted with quotechar. +static char *skip_quoted(char **buf, const char *delimiters, + const char *whitespace, char quotechar) { + char *p, *begin_word, *end_word, *end_whitespace; + + begin_word = *buf; + end_word = begin_word + strcspn(begin_word, delimiters); + + // Check for quotechar + if (end_word > begin_word) { + p = end_word - 1; + while (*p == quotechar) { + // If there is anything beyond end_word, copy it + if (*end_word == '\0') { + *p = '\0'; + break; + } else { + size_t end_off = strcspn(end_word + 1, delimiters); + memmove (p, end_word, end_off + 1); + p += end_off; // p must correspond to end_word - 1 + end_word += end_off + 1; + } + } + for (p++; p < end_word; p++) { + *p = '\0'; + } + } + + if (*end_word == '\0') { + *buf = end_word; + } else { + end_whitespace = end_word + 1 + strspn(end_word + 1, whitespace); + + for (p = end_word; p < end_whitespace; p++) { + *p = '\0'; + } + + *buf = end_whitespace; + } + + return begin_word; +} + +// Simplified version of skip_quoted without quote char +// and whitespace == delimiters +static char *skip(char **buf, const char *delimiters) { + return skip_quoted(buf, delimiters, delimiters, 0); +} + + +// Return HTTP header value, or NULL if not found. +static const char *get_header(const struct mg_request_info *ri, + const char *name) { + int i; + + for (i = 0; i < ri->num_headers; i++) + if (!mg_strcasecmp(name, ri->http_headers[i].name)) + return ri->http_headers[i].value; + + return NULL; +} + +const char *mg_get_header(const struct mg_connection *conn, const char *name) { + return get_header(&conn->request_info, name); +} + +// A helper function for traversing a comma separated list of values. +// It returns a list pointer shifted to the next value, or NULL if the end +// of the list found. +// Value is stored in val vector. If value has form "x=y", then eq_val +// vector is initialized to point to the "y" part, and val vector length +// is adjusted to point only to "x". +static const char *next_option(const char *list, struct vec *val, + struct vec *eq_val) { + if (list == NULL || *list == '\0') { + // End of the list + list = NULL; + } else { + val->ptr = list; + if ((list = strchr(val->ptr, ',')) != NULL) { + // Comma found. Store length and shift the list ptr + val->len = list - val->ptr; + list++; + } else { + // This value is the last one + list = val->ptr + strlen(val->ptr); + val->len = list - val->ptr; + } + + if (eq_val != NULL) { + // Value has form "x=y", adjust pointers and lengths + // so that val points to "x", and eq_val points to "y". + eq_val->len = 0; + eq_val->ptr = (const char *) memchr(val->ptr, '=', val->len); + if (eq_val->ptr != NULL) { + eq_val->ptr++; // Skip over '=' character + eq_val->len = val->ptr + val->len - eq_val->ptr; + val->len = (eq_val->ptr - val->ptr) - 1; + } + } + } + + return list; +} + +static int match_prefix(const char *pattern, int pattern_len, const char *str) { + const char *or_str; + int i, j, len, res; + + if ((or_str = (const char *) memchr(pattern, '|', pattern_len)) != NULL) { + res = match_prefix(pattern, or_str - pattern, str); + return res > 0 ? res : + match_prefix(or_str + 1, (pattern + pattern_len) - (or_str + 1), str); + } + + i = j = 0; + res = -1; + for (; i < pattern_len; i++, j++) { + if (pattern[i] == '?' && str[j] != '\0') { + continue; + } else if (pattern[i] == '$') { + return str[j] == '\0' ? j : -1; + } else if (pattern[i] == '*') { + i++; + if (pattern[i] == '*') { + i++; + len = (int) strlen(str + j); + } else { + len = (int) strcspn(str + j, "/"); + } + if (i == pattern_len) { + return j + len; + } + do { + res = match_prefix(pattern + i, pattern_len - i, str + j + len); + } while (res == -1 && len-- > 0); + return res == -1 ? -1 : j + res + len; + } else if (pattern[i] != str[j]) { + return -1; + } + } + return j; +} + +// HTTP 1.1 assumes keep alive if "Connection:" header is not set +// This function must tolerate situations when connection info is not +// set up, for example if request parsing failed. +static int should_keep_alive(const struct mg_connection *conn) { + const char *http_version = conn->request_info.http_version; + const char *header = mg_get_header(conn, "Connection"); + if (conn->must_close || + conn->status_code == 401 || + mg_strcasecmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes") != 0 || + (header != NULL && mg_strcasecmp(header, "keep-alive") != 0) || + (header == NULL && http_version && strcmp(http_version, "1.1"))) { + return 0; + } + return 1; +} + +static const char *suggest_connection_header(const struct mg_connection *conn) { + return should_keep_alive(conn) ? "keep-alive" : "close"; +} + +static void send_http_error(struct mg_connection *, int, const char *, + PRINTF_FORMAT_STRING(const char *fmt), ...) + PRINTF_ARGS(4, 5); + + +static void send_http_error(struct mg_connection *conn, int status, + const char *reason, const char *fmt, ...) { + char buf[MG_BUF_LEN]; + va_list ap; + int len; + + conn->status_code = status; + if (call_user(conn, MG_HTTP_ERROR) == NULL) { + buf[0] = '\0'; + len = 0; + + // Errors 1xx, 204 and 304 MUST NOT send a body + if (status > 199 && status != 204 && status != 304) { + len = mg_snprintf(conn, buf, sizeof(buf), "Error %d: %s", status, reason); + buf[len++] = '\n'; + + va_start(ap, fmt); + len += mg_vsnprintf(conn, buf + len, sizeof(buf) - len, fmt, ap); + va_end(ap); + } + DEBUG_TRACE(("[%s]", buf)); + + mg_printf(conn, "HTTP/1.1 %d %s\r\n" + "Content-Length: %d\r\n" + "Connection: %s\r\n\r\n", status, reason, len, + suggest_connection_header(conn)); + conn->num_bytes_sent += mg_printf(conn, "%s", buf); + } +} + +#if defined(_WIN32) && !defined(__SYMBIAN32__) +static int pthread_mutex_init(pthread_mutex_t *mutex, void *unused) { + unused = NULL; + *mutex = CreateMutex(NULL, FALSE, NULL); + return *mutex == NULL ? -1 : 0; +} + +static int pthread_mutex_destroy(pthread_mutex_t *mutex) { + return CloseHandle(*mutex) == 0 ? -1 : 0; +} + +static int pthread_mutex_lock(pthread_mutex_t *mutex) { + return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1; +} + +static int pthread_mutex_unlock(pthread_mutex_t *mutex) { + return ReleaseMutex(*mutex) == 0 ? -1 : 0; +} + +static int pthread_cond_init(pthread_cond_t *cv, const void *unused) { + unused = NULL; + cv->signal = CreateEvent(NULL, FALSE, FALSE, NULL); + cv->broadcast = CreateEvent(NULL, TRUE, FALSE, NULL); + return cv->signal != NULL && cv->broadcast != NULL ? 0 : -1; +} + +static int pthread_cond_wait(pthread_cond_t *cv, pthread_mutex_t *mutex) { + HANDLE handles[] = {cv->signal, cv->broadcast}; + ReleaseMutex(*mutex); + WaitForMultipleObjects(2, handles, FALSE, INFINITE); + return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1; +} + +static int pthread_cond_signal(pthread_cond_t *cv) { + return SetEvent(cv->signal) == 0 ? -1 : 0; +} + +static int pthread_cond_broadcast(pthread_cond_t *cv) { + // Implementation with PulseEvent() has race condition, see + // http://www.cs.wustl.edu/~schmidt/win32-cv-1.html + return PulseEvent(cv->broadcast) == 0 ? -1 : 0; +} + +static int pthread_cond_destroy(pthread_cond_t *cv) { + return CloseHandle(cv->signal) && CloseHandle(cv->broadcast) ? 0 : -1; +} + +// For Windows, change all slashes to backslashes in path names. +static void change_slashes_to_backslashes(char *path) { + int i; + + for (i = 0; path[i] != '\0'; i++) { + if (path[i] == '/') + path[i] = '\\'; + // i > 0 check is to preserve UNC paths, like \\server\file.txt + if (path[i] == '\\' && i > 0) + while (path[i + 1] == '\\' || path[i + 1] == '/') + (void) memmove(path + i + 1, + path + i + 2, strlen(path + i + 1)); + } +} + +// Encode 'path' which is assumed UTF-8 string, into UNICODE string. +// wbuf and wbuf_len is a target buffer and its length. +static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len) { + char buf[PATH_MAX], buf2[PATH_MAX], *p; + + mg_strlcpy(buf, path, sizeof(buf)); + change_slashes_to_backslashes(buf); + + // Point p to the end of the file name + p = buf + strlen(buf) - 1; + + // Trim trailing backslash character + while (p > buf && *p == '\\' && p[-1] != ':') { + *p-- = '\0'; + } + + // Protect from CGI code disclosure. + // This is very nasty hole. Windows happily opens files with + // some garbage in the end of file name. So fopen("a.cgi ", "r") + // actually opens "a.cgi", and does not return an error! + if (*p == 0x20 || // No space at the end + (*p == 0x2e && p > buf) || // No '.' but allow '.' as full path + *p == 0x2b || // No '+' + (*p & ~0x7f)) { // And generally no non-ASCII chars + (void) fprintf(stderr, "Rejecting suspicious path: [%s]", buf); + wbuf[0] = L'\0'; + } else { + // Convert to Unicode and back. If doubly-converted string does not + // match the original, something is fishy, reject. + memset(wbuf, 0, wbuf_len * sizeof(wchar_t)); + MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len); + WideCharToMultiByte(CP_UTF8, 0, wbuf, (int) wbuf_len, buf2, sizeof(buf2), + NULL, NULL); + if (strcmp(buf, buf2) != 0) { + wbuf[0] = L'\0'; + } + } +} + +#if defined(_WIN32_WCE) +static time_t time(time_t *ptime) { + time_t t; + SYSTEMTIME st; + FILETIME ft; + + GetSystemTime(&st); + SystemTimeToFileTime(&st, &ft); + t = SYS2UNIX_TIME(ft.dwLowDateTime, ft.dwHighDateTime); + + if (ptime != NULL) { + *ptime = t; + } + + return t; +} + +static struct tm *localtime(const time_t *ptime, struct tm *ptm) { + int64_t t = ((int64_t) *ptime) * RATE_DIFF + EPOCH_DIFF; + FILETIME ft, lft; + SYSTEMTIME st; + TIME_ZONE_INFORMATION tzinfo; + + if (ptm == NULL) { + return NULL; + } + + * (int64_t *) &ft = t; + FileTimeToLocalFileTime(&ft, &lft); + FileTimeToSystemTime(&lft, &st); + ptm->tm_year = st.wYear - 1900; + ptm->tm_mon = st.wMonth - 1; + ptm->tm_wday = st.wDayOfWeek; + ptm->tm_mday = st.wDay; + ptm->tm_hour = st.wHour; + ptm->tm_min = st.wMinute; + ptm->tm_sec = st.wSecond; + ptm->tm_yday = 0; // hope nobody uses this + ptm->tm_isdst = + GetTimeZoneInformation(&tzinfo) == TIME_ZONE_ID_DAYLIGHT ? 1 : 0; + + return ptm; +} + +static struct tm *gmtime(const time_t *ptime, struct tm *ptm) { + // FIXME(lsm): fix this. + return localtime(ptime, ptm); +} + +static size_t strftime(char *dst, size_t dst_size, const char *fmt, + const struct tm *tm) { + (void) snprintf(dst, dst_size, "implement strftime() for WinCE"); + return 0; +} +#endif + +static int mg_rename(const char* oldname, const char* newname) { + wchar_t woldbuf[PATH_MAX]; + wchar_t wnewbuf[PATH_MAX]; + + to_unicode(oldname, woldbuf, ARRAY_SIZE(woldbuf)); + to_unicode(newname, wnewbuf, ARRAY_SIZE(wnewbuf)); + + return MoveFileW(woldbuf, wnewbuf) ? 0 : -1; +} + + +static FILE *mg_fopen(const char *path, const char *mode) { + wchar_t wbuf[PATH_MAX], wmode[20]; + + to_unicode(path, wbuf, ARRAY_SIZE(wbuf)); + MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, ARRAY_SIZE(wmode)); + + return _wfopen(wbuf, wmode); +} + +static int mg_stat(const char *path, struct mgstat *stp) { + int ok = -1; // Error + wchar_t wbuf[PATH_MAX]; + WIN32_FILE_ATTRIBUTE_DATA info; + + to_unicode(path, wbuf, ARRAY_SIZE(wbuf)); + + if (GetFileAttributesExW(wbuf, GetFileExInfoStandard, &info) != 0) { + stp->size = MAKEUQUAD(info.nFileSizeLow, info.nFileSizeHigh); + stp->mtime = SYS2UNIX_TIME(info.ftLastWriteTime.dwLowDateTime, + info.ftLastWriteTime.dwHighDateTime); + stp->is_directory = + info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY; + ok = 0; // Success + } + + return ok; +} + +static int mg_remove(const char *path) { + wchar_t wbuf[PATH_MAX]; + to_unicode(path, wbuf, ARRAY_SIZE(wbuf)); + return DeleteFileW(wbuf) ? 0 : -1; +} + +static int mg_mkdir(const char *path, int mode) { + char buf[PATH_MAX]; + wchar_t wbuf[PATH_MAX]; + + mode = 0; // Unused + mg_strlcpy(buf, path, sizeof(buf)); + change_slashes_to_backslashes(buf); + + (void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, sizeof(wbuf)); + + return CreateDirectoryW(wbuf, NULL) ? 0 : -1; +} + +// Implementation of POSIX opendir/closedir/readdir for Windows. +static DIR * opendir(const char *name) { + DIR *dir = NULL; + wchar_t wpath[PATH_MAX]; + DWORD attrs; + + if (name == NULL) { + SetLastError(ERROR_BAD_ARGUMENTS); + } else if ((dir = (DIR *) malloc(sizeof(*dir))) == NULL) { + SetLastError(ERROR_NOT_ENOUGH_MEMORY); + } else { + to_unicode(name, wpath, ARRAY_SIZE(wpath)); + attrs = GetFileAttributesW(wpath); + if (attrs != 0xFFFFFFFF && + ((attrs & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)) { + (void) wcscat(wpath, L"\\*"); + dir->handle = FindFirstFileW(wpath, &dir->info); + dir->result.d_name[0] = '\0'; + } else { + free(dir); + dir = NULL; + } + } + + return dir; +} + +static int closedir(DIR *dir) { + int result = 0; + + if (dir != NULL) { + if (dir->handle != INVALID_HANDLE_VALUE) + result = FindClose(dir->handle) ? 0 : -1; + + free(dir); + } else { + result = -1; + SetLastError(ERROR_BAD_ARGUMENTS); + } + + return result; +} + +static struct dirent *readdir(DIR *dir) { + struct dirent *result = 0; + + if (dir) { + if (dir->handle != INVALID_HANDLE_VALUE) { + result = &dir->result; + (void) WideCharToMultiByte(CP_UTF8, 0, + dir->info.cFileName, -1, result->d_name, + sizeof(result->d_name), NULL, NULL); + + if (!FindNextFileW(dir->handle, &dir->info)) { + (void) FindClose(dir->handle); + dir->handle = INVALID_HANDLE_VALUE; + } + + } else { + SetLastError(ERROR_FILE_NOT_FOUND); + } + } else { + SetLastError(ERROR_BAD_ARGUMENTS); + } + + return result; +} + +#define set_close_on_exec(fd) // No FD_CLOEXEC on Windows + +int mg_start_thread(mg_thread_func_t f, void *p) { + return _beginthread((void (__cdecl *)(void *)) f, 0, p) == -1L ? -1 : 0; +} + +static HANDLE dlopen(const char *dll_name, int flags) { + wchar_t wbuf[PATH_MAX]; + flags = 0; // Unused + to_unicode(dll_name, wbuf, ARRAY_SIZE(wbuf)); + return LoadLibraryW(wbuf); +} + +#if !defined(NO_CGI) +#define SIGKILL 0 +static int kill(pid_t pid, int sig_num) { + (void) TerminateProcess(pid, sig_num); + (void) CloseHandle(pid); + return 0; +} + +static pid_t spawn_process(struct mg_connection *conn, const char *prog, + char *envblk, char *envp[], int fd_stdin, + int fd_stdout, const char *dir) { + HANDLE me; + char *p, *interp, full_interp[PATH_MAX], cmdline[PATH_MAX], buf[PATH_MAX]; + FILE *fp; + STARTUPINFOA si = { sizeof(si) }; + PROCESS_INFORMATION pi = { 0 }; + + envp = NULL; // Unused + + // TODO(lsm): redirect CGI errors to the error log file + si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW; + si.wShowWindow = SW_HIDE; + + me = GetCurrentProcess(); + DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdin), me, + &si.hStdInput, 0, TRUE, DUPLICATE_SAME_ACCESS); + DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdout), me, + &si.hStdOutput, 0, TRUE, DUPLICATE_SAME_ACCESS); + + // If CGI file is a script, try to read the interpreter line + interp = conn->ctx->config[CGI_INTERPRETER]; + if (interp == NULL) { + buf[0] = buf[2] = '\0'; + + // Read the first line of the script into the buffer + snprintf(cmdline, sizeof(cmdline), "%s%c%s", dir, '/', prog); + if ((fp = mg_fopen(cmdline, "r")) != NULL) { + fgets(buf, sizeof(buf), fp); + fclose(fp); + buf[sizeof(buf) - 1] = '\0'; + } + + if (buf[0] == '#' && buf[1] == '!') { + // Trim whitespace in interpreter name + for (p = buf + 2; *p != '\0' && isspace(* (unsigned char *) p); ) + p++; + *p = '\0'; + } + interp = buf + 2; + } + + if (interp[0] != '\0') { + GetFullPathName(interp, sizeof(full_interp), full_interp, NULL); + interp = full_interp; + } + + mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%s%s", + interp, interp[0] == '\0' ? "" : " ", prog); + + DEBUG_TRACE(("Running [%s]", cmdline)); + if (CreateProcessA(NULL, cmdline, NULL, NULL, TRUE, + CREATE_NEW_PROCESS_GROUP, envblk, dir, &si, &pi) == 0) { + cry(conn, "%s: CreateProcess(%s): %d", + __func__, cmdline, ERRNO); + pi.hProcess = (pid_t) -1; + } + + // Always close these to prevent handle leakage. + (void) close(fd_stdin); + (void) close(fd_stdout); + + (void) CloseHandle(si.hStdOutput); + (void) CloseHandle(si.hStdInput); + (void) CloseHandle(pi.hThread); + + return (pid_t) pi.hProcess; +} +#endif // !NO_CGI + +static int set_non_blocking_mode(SOCKET sock) { + unsigned long on = 1; + return ioctlsocket(sock, FIONBIO, &on); +} + +#else +static int mg_stat(const char *path, struct mgstat *stp) { + struct stat st; + int ok; + + if (stat(path, &st) == 0) { + ok = 0; + stp->size = st.st_size; + stp->mtime = st.st_mtime; + stp->is_directory = S_ISDIR(st.st_mode); + } else { + ok = -1; + } + + return ok; +} + +static void set_close_on_exec(int fd) { + (void) fcntl(fd, F_SETFD, FD_CLOEXEC); +} + +int mg_start_thread(mg_thread_func_t func, void *param) { + pthread_t thread_id; + pthread_attr_t attr; + + (void) pthread_attr_init(&attr); + (void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); + // TODO(lsm): figure out why mongoose dies on Linux if next line is enabled + // (void) pthread_attr_setstacksize(&attr, sizeof(struct mg_connection) * 5); + + return pthread_create(&thread_id, &attr, func, param); +} + +#ifndef NO_CGI +static pid_t spawn_process(struct mg_connection *conn, const char *prog, + char *envblk, char *envp[], int fd_stdin, + int fd_stdout, const char *dir) { + pid_t pid; + const char *interp; + + envblk = NULL; // Unused + + if ((pid = fork()) == -1) { + // Parent + send_http_error(conn, 500, http_500_error, "fork(): %s", strerror(ERRNO)); + } else if (pid == 0) { + // Child + if (chdir(dir) != 0) { + cry(conn, "%s: chdir(%s): %s", __func__, dir, strerror(ERRNO)); + } else if (dup2(fd_stdin, 0) == -1) { + cry(conn, "%s: dup2(%d, 0): %s", __func__, fd_stdin, strerror(ERRNO)); + } else if (dup2(fd_stdout, 1) == -1) { + cry(conn, "%s: dup2(%d, 1): %s", __func__, fd_stdout, strerror(ERRNO)); + } else { + (void) dup2(fd_stdout, 2); + (void) close(fd_stdin); + (void) close(fd_stdout); + + interp = conn->ctx->config[CGI_INTERPRETER]; + if (interp == NULL) { + (void) execle(prog, prog, NULL, envp); + cry(conn, "%s: execle(%s): %s", __func__, prog, strerror(ERRNO)); + } else { + (void) execle(interp, interp, prog, NULL, envp); + cry(conn, "%s: execle(%s %s): %s", __func__, interp, prog, + strerror(ERRNO)); + } + } + exit(EXIT_FAILURE); + } + + // Parent. Close stdio descriptors + (void) close(fd_stdin); + (void) close(fd_stdout); + + return pid; +} +#endif // !NO_CGI + +static int set_non_blocking_mode(SOCKET sock) { + int flags; + + flags = fcntl(sock, F_GETFL, 0); + (void) fcntl(sock, F_SETFL, flags | O_NONBLOCK); + + return 0; +} +#endif // _WIN32 + +// Write data to the IO channel - opened file descriptor, socket or SSL +// descriptor. Return number of bytes written. +static int64_t push(FILE *fp, SOCKET sock, SSL *ssl, const char *buf, + int64_t len) { + int64_t sent; + int n, k; + + sent = 0; + while (sent < len) { + + // How many bytes we send in this iteration + k = len - sent > INT_MAX ? INT_MAX : (int) (len - sent); + + if (ssl != NULL) { + n = SSL_write(ssl, buf + sent, k); + } else if (fp != NULL) { + n = (int) fwrite(buf + sent, 1, (size_t) k, fp); + if (ferror(fp)) + n = -1; + } else { + n = send(sock, buf + sent, (size_t) k, MSG_NOSIGNAL); + } + + if (n < 0) + break; + + sent += n; + } + + return sent; +} + +// This function is needed to prevent Mongoose to be stuck in a blocking +// socket read when user requested exit. To do that, we sleep in select +// with a timeout, and when returned, check the context for the stop flag. +// If it is set, we return 0, and this means that we must not continue +// reading, must give up and close the connection and exit serving thread. +static int wait_until_socket_is_readable(struct mg_connection *conn) { + int result; + struct timeval tv; + fd_set set; + + do { + tv.tv_sec = 0; + tv.tv_usec = 300 * 1000; + FD_ZERO(&set); + FD_SET(conn->client.sock, &set); + result = select(conn->client.sock + 1, &set, NULL, NULL, &tv); + } while ((result == 0 || (result < 0 && ERRNO == EINTR)) && + conn->ctx->stop_flag == 0); + + return conn->ctx->stop_flag || result < 0 ? 0 : 1; +} + +// Read from IO channel - opened file descriptor, socket, or SSL descriptor. +// Return negative value on error, or number of bytes read on success. +static int pull(FILE *fp, struct mg_connection *conn, char *buf, int len) { + int nread; + + if (fp != NULL) { + // Use read() instead of fread(), because if we're reading from the CGI + // pipe, fread() may block until IO buffer is filled up. We cannot afford + // to block and must pass all read bytes immediately to the client. + nread = read(fileno(fp), buf, (size_t) len); + } else if (!wait_until_socket_is_readable(conn)) { + nread = -1; + } else if (conn->ssl != NULL) { + nread = SSL_read(conn->ssl, buf, len); + } else { + nread = recv(conn->client.sock, buf, (size_t) len, 0); + } + + return conn->ctx->stop_flag ? -1 : nread; +} + +int mg_read(struct mg_connection *conn, void *buf, size_t len) { + int n, buffered_len, nread; + const char *body; + + nread = 0; + if (conn->consumed_content < conn->content_len) { + // Adjust number of bytes to read. + int64_t to_read = conn->content_len - conn->consumed_content; + if (to_read < (int64_t) len) { + len = (size_t) to_read; + } + + // Return buffered data + body = conn->buf + conn->request_len + conn->consumed_content; + buffered_len = &conn->buf[conn->data_len] - body; + if (buffered_len > 0) { + if (len < (size_t) buffered_len) { + buffered_len = (int) len; + } + memcpy(buf, body, (size_t) buffered_len); + len -= buffered_len; + conn->consumed_content += buffered_len; + nread += buffered_len; + buf = (char *) buf + buffered_len; + } + + // We have returned all buffered data. Read new data from the remote socket. + while (len > 0) { + n = pull(NULL, conn, (char *) buf, (int) len); + if (n < 0) { + nread = n; // Propagate the error + break; + } else if (n == 0) { + break; // No more data to read + } else { + buf = (char *) buf + n; + conn->consumed_content += n; + nread += n; + len -= n; + } + } + } + return nread; +} + +int mg_write(struct mg_connection *conn, const void *buf, size_t len) { + time_t now; + int64_t n, total, allowed; + + if (conn->throttle > 0) { + if ((now = time(NULL)) != conn->last_throttle_time) { + conn->last_throttle_time = now; + conn->last_throttle_bytes = 0; + } + allowed = conn->throttle - conn->last_throttle_bytes; + if (allowed > (int64_t) len) { + allowed = len; + } + if ((total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf, + (int64_t) allowed)) == allowed) { + buf = (char *) buf + total; + conn->last_throttle_bytes += total; + while (total < (int64_t) len && conn->ctx->stop_flag == 0) { + allowed = conn->throttle > (int64_t) len - total ? + len - total : conn->throttle; + if ((n = push(NULL, conn->client.sock, conn->ssl, (const char *) buf, + (int64_t) allowed)) != allowed) { + break; + } + sleep(1); + conn->last_throttle_bytes = allowed; + conn->last_throttle_time = time(NULL); + buf = (char *) buf + n; + total += n; + } + } + } else { + total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf, + (int64_t) len); + } + return (int) total; +} + +int mg_printf(struct mg_connection *conn, const char *fmt, ...) { + char mem[MG_BUF_LEN], *buf = mem; + int len; + va_list ap; + + // Print in a local buffer first, hoping that it is large enough to + // hold the whole message + va_start(ap, fmt); + len = vsnprintf(mem, sizeof(mem), fmt, ap); + va_end(ap); + + if (len == 0) { + // Do nothing. mg_printf(conn, "%s", "") was called. + } else if (len < 0) { + // vsnprintf() error, give up + len = -1; + cry(conn, "%s(%s, ...): vsnprintf() error", __func__, fmt); + } else if (len > (int) sizeof(mem) && (buf = (char *) malloc(len + 1)) != NULL) { + // Local buffer is not large enough, allocate big buffer on heap + va_start(ap, fmt); + vsnprintf(buf, len + 1, fmt, ap); + va_end(ap); + len = mg_write(conn, buf, (size_t) len); + free(buf); + } else if (len > (int) sizeof(mem)) { + // Failed to allocate large enough buffer, give up + cry(conn, "%s(%s, ...): Can't allocate %d bytes, not printing anything", + __func__, fmt, len); + len = -1; + } else { + // Copy to the local buffer succeeded + len = mg_write(conn, buf, (size_t) len); + } + + return len; +} + +// URL-decode input buffer into destination buffer. +// 0-terminate the destination buffer. Return the length of decoded data. +// form-url-encoded data differs from URI encoding in a way that it +// uses '+' as character for space, see RFC 1866 section 8.2.1 +// http://ftp.ics.uci.edu/pub/ietf/html/rfc1866.txt +static size_t url_decode(const char *src, size_t src_len, char *dst, + size_t dst_len, int is_form_url_encoded) { + size_t i, j; + int a, b; +#define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W') + + for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) { + if (src[i] == '%' && + isxdigit(* (const unsigned char *) (src + i + 1)) && + isxdigit(* (const unsigned char *) (src + i + 2))) { + a = tolower(* (const unsigned char *) (src + i + 1)); + b = tolower(* (const unsigned char *) (src + i + 2)); + dst[j] = (char) ((HEXTOI(a) << 4) | HEXTOI(b)); + i += 2; + } else if (is_form_url_encoded && src[i] == '+') { + dst[j] = ' '; + } else { + dst[j] = src[i]; + } + } + + dst[j] = '\0'; // Null-terminate the destination + + return j; +} + +// Scan given buffer and fetch the value of the given variable. +// It can be specified in query string, or in the POST data. +// Return -1 if the variable not found, or length of the URL-decoded value +// stored in dst. The dst buffer is guaranteed to be NUL-terminated if it +// is not NULL or zero-length. If dst is NULL or zero-length, then +// -2 is returned. +int mg_get_var(const char *buf, size_t buf_len, const char *name, + char *dst, size_t dst_len) { + const char *p, *e, *s; + size_t name_len; + int len; + + if (dst == NULL || dst_len == 0) { + len = -2; + } else if (buf == NULL || name == NULL || buf_len == 0) { + len = -1; + dst[0] = '\0'; + } else { + name_len = strlen(name); + e = buf + buf_len; + len = -1; + dst[0] = '\0'; + + // buf is "var1=val1&var2=val2...". Find variable first + for (p = buf; p + name_len < e; p++) { + if ((p == buf || p[-1] == '&') && p[name_len] == '=' && + !mg_strncasecmp(name, p, name_len)) { + + // Point p to variable value + p += name_len + 1; + + // Point s to the end of the value + s = (const char *) memchr(p, '&', (size_t)(e - p)); + if (s == NULL) { + s = e; + } + assert(s >= p); + + // Decode variable into destination buffer + if ((size_t) (s - p) < dst_len) { + len = (int) url_decode(p, (size_t)(s - p), dst, dst_len, 1); + } + break; + } + } + } + + return len; +} + +int mg_get_cookie(const struct mg_connection *conn, const char *cookie_name, + char *dst, size_t dst_size) { + const char *s, *p, *end; + int name_len, len = -1; + + dst[0] = '\0'; + if ((s = mg_get_header(conn, "Cookie")) == NULL) { + return -1; + } + + name_len = (int) strlen(cookie_name); + end = s + strlen(s); + + for (; (s = strstr(s, cookie_name)) != NULL; s += name_len) + if (s[name_len] == '=') { + s += name_len + 1; + if ((p = strchr(s, ' ')) == NULL) + p = end; + if (p[-1] == ';') + p--; + if (*s == '"' && p[-1] == '"' && p > s + 1) { + s++; + p--; + } + if ((size_t) (p - s) < dst_size) { + len = p - s; + mg_strlcpy(dst, s, (size_t) len + 1); + } + break; + } + + return len; +} + +static int convert_uri_to_file_name(struct mg_connection *conn, char *buf, + size_t buf_len, struct mgstat *st) { + struct vec a, b; + const char *rewrite, *uri = conn->request_info.uri; + char *p; + int match_len, stat_result; + + buf_len--; // This is because memmove() for PATH_INFO may shift part + // of the path one byte on the right. + mg_snprintf(conn, buf, buf_len, "%s%s", conn->ctx->config[DOCUMENT_ROOT], + uri); + + rewrite = conn->ctx->config[REWRITE]; + while ((rewrite = next_option(rewrite, &a, &b)) != NULL) { + if ((match_len = match_prefix(a.ptr, a.len, uri)) > 0) { + mg_snprintf(conn, buf, buf_len, "%.*s%s", (int) b.len, b.ptr, + uri + match_len); + break; + } + } + + if ((stat_result = mg_stat(buf, st)) != 0) { + // Support PATH_INFO for CGI scripts. + for (p = buf + strlen(buf); p > buf + 1; p--) { + if (*p == '/') { + *p = '\0'; + if (match_prefix(conn->ctx->config[CGI_EXTENSIONS], + strlen(conn->ctx->config[CGI_EXTENSIONS]), buf) > 0 && + (stat_result = mg_stat(buf, st)) == 0) { + // Shift PATH_INFO block one character right, e.g. + // "/x.cgi/foo/bar\x00" => "/x.cgi\x00/foo/bar\x00" + // conn->path_info is pointing to the local variable "path" declared + // in handle_request(), so PATH_INFO is not valid after + // handle_request returns. + conn->path_info = p + 1; + memmove(p + 2, p + 1, strlen(p + 1) + 1); // +1 is for trailing \0 + p[1] = '/'; + break; + } else { + *p = '/'; + stat_result = -1; + } + } + } + } + + return stat_result; +} + +static int sslize(struct mg_connection *conn, SSL_CTX *s, int (*func)(SSL *)) { + return (conn->ssl = SSL_new(s)) != NULL && + SSL_set_fd(conn->ssl, conn->client.sock) == 1 && + func(conn->ssl) == 1; +} + +// Check whether full request is buffered. Return: +// -1 if request is malformed +// 0 if request is not yet fully buffered +// >0 actual request length, including last \r\n\r\n +static int get_request_len(const char *buf, int buflen) { + const char *s, *e; + int len = 0; + + for (s = buf, e = s + buflen - 1; len <= 0 && s < e; s++) + // Control characters are not allowed but >=128 is. + if (!isprint(* (const unsigned char *) s) && *s != '\r' && + *s != '\n' && * (const unsigned char *) s < 128) { + len = -1; + break; // [i_a] abort scan as soon as one malformed character is found; don't let subsequent \r\n\r\n win us over anyhow + } else if (s[0] == '\n' && s[1] == '\n') { + len = (int) (s - buf) + 2; + } else if (s[0] == '\n' && &s[1] < e && + s[1] == '\r' && s[2] == '\n') { + len = (int) (s - buf) + 3; + } + + return len; +} + +// Convert month to the month number. Return -1 on error, or month number +static int get_month_index(const char *s) { + size_t i; + + for (i = 0; i < ARRAY_SIZE(month_names); i++) + if (!strcmp(s, month_names[i])) + return (int) i; + + return -1; +} + +static int num_leap_years(int year) { + return year / 4 - year / 100 + year / 400; +} + +// Parse UTC date-time string, and return the corresponding time_t value. +static time_t parse_date_string(const char *datetime) { + static const unsigned short days_before_month[] = { + 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 + }; + char month_str[32]; + int second, minute, hour, day, month, year, leap_days, days; + time_t result = (time_t) 0; + + if (((sscanf(datetime, "%d/%3s/%d %d:%d:%d", + &day, month_str, &year, &hour, &minute, &second) == 6) || + (sscanf(datetime, "%d %3s %d %d:%d:%d", + &day, month_str, &year, &hour, &minute, &second) == 6) || + (sscanf(datetime, "%*3s, %d %3s %d %d:%d:%d", + &day, month_str, &year, &hour, &minute, &second) == 6) || + (sscanf(datetime, "%d-%3s-%d %d:%d:%d", + &day, month_str, &year, &hour, &minute, &second) == 6)) && + year > 1970 && + (month = get_month_index(month_str)) != -1) { + leap_days = num_leap_years(year) - num_leap_years(1970); + year -= 1970; + days = year * 365 + days_before_month[month] + (day - 1) + leap_days; + result = days * 24 * 3600 + hour * 3600 + minute * 60 + second; + } + + return result; +} + +// Protect against directory disclosure attack by removing '..', +// excessive '/' and '\' characters +static void remove_double_dots_and_double_slashes(char *s) { + char *p = s; + + while (*s != '\0') { + *p++ = *s++; + if (s[-1] == '/' || s[-1] == '\\') { + // Skip all following slashes, backslashes and double-dots + while (s[0] != '\0') { + if (s[0] == '/' || s[0] == '\\') { + s++; + } else if (s[0] == '.' && s[1] == '.') { + s += 2; + } else { + break; + } + } + } + } + *p = '\0'; +} + +static const struct { + const char *extension; + size_t ext_len; + const char *mime_type; +} builtin_mime_types[] = { + {".html", 5, "text/html"}, + {".htm", 4, "text/html"}, + {".shtm", 5, "text/html"}, + {".shtml", 6, "text/html"}, + {".css", 4, "text/css"}, + {".js", 3, "application/x-javascript"}, + {".ico", 4, "image/x-icon"}, + {".gif", 4, "image/gif"}, + {".jpg", 4, "image/jpeg"}, + {".jpeg", 5, "image/jpeg"}, + {".png", 4, "image/png"}, + {".svg", 4, "image/svg+xml"}, + {".txt", 4, "text/plain"}, + {".torrent", 8, "application/x-bittorrent"}, + {".wav", 4, "audio/x-wav"}, + {".mp3", 4, "audio/x-mp3"}, + {".mid", 4, "audio/mid"}, + {".m3u", 4, "audio/x-mpegurl"}, + {".ram", 4, "audio/x-pn-realaudio"}, + {".xml", 4, "text/xml"}, + {".json", 5, "text/json"}, + {".xslt", 5, "application/xml"}, + {".ra", 3, "audio/x-pn-realaudio"}, + {".doc", 4, "application/msword"}, + {".exe", 4, "application/octet-stream"}, + {".zip", 4, "application/x-zip-compressed"}, + {".xls", 4, "application/excel"}, + {".tgz", 4, "application/x-tar-gz"}, + {".tar", 4, "application/x-tar"}, + {".gz", 3, "application/x-gunzip"}, + {".arj", 4, "application/x-arj-compressed"}, + {".rar", 4, "application/x-arj-compressed"}, + {".rtf", 4, "application/rtf"}, + {".pdf", 4, "application/pdf"}, + {".swf", 4, "application/x-shockwave-flash"}, + {".mpg", 4, "video/mpeg"}, + {".webm", 5, "video/webm"}, + {".mpeg", 5, "video/mpeg"}, + {".mp4", 4, "video/mp4"}, + {".m4v", 4, "video/x-m4v"}, + {".asf", 4, "video/x-ms-asf"}, + {".avi", 4, "video/x-msvideo"}, + {".bmp", 4, "image/bmp"}, + {NULL, 0, NULL} +}; + +const char *mg_get_builtin_mime_type(const char *path) { + const char *ext; + size_t i, path_len; + + path_len = strlen(path); + + for (i = 0; builtin_mime_types[i].extension != NULL; i++) { + ext = path + (path_len - builtin_mime_types[i].ext_len); + if (path_len > builtin_mime_types[i].ext_len && + mg_strcasecmp(ext, builtin_mime_types[i].extension) == 0) { + return builtin_mime_types[i].mime_type; + } + } + + return "text/plain"; +} + +// Look at the "path" extension and figure what mime type it has. +// Store mime type in the vector. +static void get_mime_type(struct mg_context *ctx, const char *path, + struct vec *vec) { + struct vec ext_vec, mime_vec; + const char *list, *ext; + size_t path_len; + + path_len = strlen(path); + + // Scan user-defined mime types first, in case user wants to + // override default mime types. + list = ctx->config[EXTRA_MIME_TYPES]; + while ((list = next_option(list, &ext_vec, &mime_vec)) != NULL) { + // ext now points to the path suffix + ext = path + path_len - ext_vec.len; + if (mg_strncasecmp(ext, ext_vec.ptr, ext_vec.len) == 0) { + *vec = mime_vec; + return; + } + } + + vec->ptr = mg_get_builtin_mime_type(path); + vec->len = strlen(vec->ptr); +} + +#ifndef HAVE_MD5 +typedef struct MD5Context { + uint32_t buf[4]; + uint32_t bits[2]; + unsigned char in[64]; +} MD5_CTX; + +#if defined(__BYTE_ORDER) && (__BYTE_ORDER == 1234) +#define byteReverse(buf, len) // Do nothing +#else +static void byteReverse(unsigned char *buf, unsigned longs) { + uint32_t t; + do { + t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 | + ((unsigned) buf[1] << 8 | buf[0]); + *(uint32_t *) buf = t; + buf += 4; + } while (--longs); +} +#endif + +#define F1(x, y, z) (z ^ (x & (y ^ z))) +#define F2(x, y, z) F1(z, x, y) +#define F3(x, y, z) (x ^ y ^ z) +#define F4(x, y, z) (y ^ (x | ~z)) + +#define MD5STEP(f, w, x, y, z, data, s) \ + ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x ) + +// Start MD5 accumulation. Set bit count to 0 and buffer to mysterious +// initialization constants. +static void MD5Init(MD5_CTX *ctx) { + ctx->buf[0] = 0x67452301; + ctx->buf[1] = 0xefcdab89; + ctx->buf[2] = 0x98badcfe; + ctx->buf[3] = 0x10325476; + + ctx->bits[0] = 0; + ctx->bits[1] = 0; +} + +static void MD5Transform(uint32_t buf[4], uint32_t const in[16]) { + register uint32_t a, b, c, d; + + a = buf[0]; + b = buf[1]; + c = buf[2]; + d = buf[3]; + + MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7); + MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12); + MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17); + MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22); + MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7); + MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12); + MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17); + MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22); + MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7); + MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12); + MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17); + MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22); + MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7); + MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12); + MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17); + MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22); + + MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5); + MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9); + MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14); + MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20); + MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5); + MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9); + MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14); + MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20); + MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5); + MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9); + MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14); + MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20); + MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5); + MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9); + MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14); + MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20); + + MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4); + MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11); + MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16); + MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23); + MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4); + MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11); + MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16); + MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23); + MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4); + MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11); + MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16); + MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23); + MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4); + MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11); + MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16); + MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23); + + MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6); + MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10); + MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15); + MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21); + MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6); + MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10); + MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15); + MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21); + MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6); + MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10); + MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15); + MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21); + MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6); + MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10); + MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15); + MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21); + + buf[0] += a; + buf[1] += b; + buf[2] += c; + buf[3] += d; +} + +static void MD5Update(MD5_CTX *ctx, unsigned char const *buf, unsigned len) { + uint32_t t; + + t = ctx->bits[0]; + if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t) + ctx->bits[1]++; + ctx->bits[1] += len >> 29; + + t = (t >> 3) & 0x3f; + + if (t) { + unsigned char *p = (unsigned char *) ctx->in + t; + + t = 64 - t; + if (len < t) { + memcpy(p, buf, len); + return; + } + memcpy(p, buf, t); + byteReverse(ctx->in, 16); + MD5Transform(ctx->buf, (uint32_t *) ctx->in); + buf += t; + len -= t; + } + + while (len >= 64) { + memcpy(ctx->in, buf, 64); + byteReverse(ctx->in, 16); + MD5Transform(ctx->buf, (uint32_t *) ctx->in); + buf += 64; + len -= 64; + } + + memcpy(ctx->in, buf, len); +} + +static void MD5Final(unsigned char digest[16], MD5_CTX *ctx) { + unsigned count; + unsigned char *p; + + count = (ctx->bits[0] >> 3) & 0x3F; + + p = ctx->in + count; + *p++ = 0x80; + count = 64 - 1 - count; + if (count < 8) { + memset(p, 0, count); + byteReverse(ctx->in, 16); + MD5Transform(ctx->buf, (uint32_t *) ctx->in); + memset(ctx->in, 0, 56); + } else { + memset(p, 0, count - 8); + } + byteReverse(ctx->in, 14); + + ((uint32_t *) ctx->in)[14] = ctx->bits[0]; + ((uint32_t *) ctx->in)[15] = ctx->bits[1]; + + MD5Transform(ctx->buf, (uint32_t *) ctx->in); + byteReverse((unsigned char *) ctx->buf, 4); + memcpy(digest, ctx->buf, 16); + memset((char *) ctx, 0, sizeof(*ctx)); +} +#endif // !HAVE_MD5 + +// Stringify binary data. Output buffer must be twice as big as input, +// because each byte takes 2 bytes in string representation +static void bin2str(char *to, const unsigned char *p, size_t len) { + static const char *hex = "0123456789abcdef"; + + for (; len--; p++) { + *to++ = hex[p[0] >> 4]; + *to++ = hex[p[0] & 0x0f]; + } + *to = '\0'; +} + +// Return stringified MD5 hash for list of strings. Buffer must be 33 bytes. +void mg_md5(char buf[33], ...) { + unsigned char hash[16]; + const char *p; + va_list ap; + MD5_CTX ctx; + + MD5Init(&ctx); + + va_start(ap, buf); + while ((p = va_arg(ap, const char *)) != NULL) { + MD5Update(&ctx, (const unsigned char *) p, (unsigned) strlen(p)); + } + va_end(ap); + + MD5Final(hash, &ctx); + bin2str(buf, hash, sizeof(hash)); +} + +// Check the user's password, return 1 if OK +static int check_password(const char *method, const char *ha1, const char *uri, + const char *nonce, const char *nc, const char *cnonce, + const char *qop, const char *response) { + char ha2[32 + 1], expected_response[32 + 1]; + + // Some of the parameters may be NULL + if (method == NULL || nonce == NULL || nc == NULL || cnonce == NULL || + qop == NULL || response == NULL) { + return 0; + } + + // NOTE(lsm): due to a bug in MSIE, we do not compare the URI + // TODO(lsm): check for authentication timeout + if (// strcmp(dig->uri, c->ouri) != 0 || + strlen(response) != 32 + // || now - strtoul(dig->nonce, NULL, 10) > 3600 + ) { + return 0; + } + + mg_md5(ha2, method, ":", uri, NULL); + mg_md5(expected_response, ha1, ":", nonce, ":", nc, + ":", cnonce, ":", qop, ":", ha2, NULL); + + return mg_strcasecmp(response, expected_response) == 0; +} + +// Use the global passwords file, if specified by auth_gpass option, +// or search for .htpasswd in the requested directory. +static FILE *open_auth_file(struct mg_connection *conn, const char *path) { + struct mg_context *ctx = conn->ctx; + char name[PATH_MAX]; + const char *p, *e; + struct mgstat st; + FILE *fp; + + if (ctx->config[GLOBAL_PASSWORDS_FILE] != NULL) { + // Use global passwords file + fp = mg_fopen(ctx->config[GLOBAL_PASSWORDS_FILE], "r"); + if (fp == NULL) + cry(fc(ctx), "fopen(%s): %s", + ctx->config[GLOBAL_PASSWORDS_FILE], strerror(ERRNO)); + } else if (!mg_stat(path, &st) && st.is_directory) { + (void) mg_snprintf(conn, name, sizeof(name), "%s%c%s", + path, '/', PASSWORDS_FILE_NAME); + fp = mg_fopen(name, "r"); + } else { + // Try to find .htpasswd in requested directory. + for (p = path, e = p + strlen(p) - 1; e > p; e--) + if (e[0] == '/') + break; + (void) mg_snprintf(conn, name, sizeof(name), "%.*s%c%s", + (int) (e - p), p, '/', PASSWORDS_FILE_NAME); + fp = mg_fopen(name, "r"); + } + + return fp; +} + +// Parsed Authorization header +struct ah { + char *user, *uri, *cnonce, *response, *qop, *nc, *nonce; +}; + +// Return 1 on success. Always initializes the ah structure. +static int parse_auth_header(struct mg_connection *conn, char *buf, + size_t buf_size, struct ah *ah) { + char *name, *value, *s; + const char *auth_header; + + (void) memset(ah, 0, sizeof(*ah)); + if ((auth_header = mg_get_header(conn, "Authorization")) == NULL || + mg_strncasecmp(auth_header, "Digest ", 7) != 0) { + return 0; + } + + // Make modifiable copy of the auth header + (void) mg_strlcpy(buf, auth_header + 7, buf_size); + s = buf; + + // Parse authorization header + for (;;) { + // Gobble initial spaces + while (isspace(* (unsigned char *) s)) { + s++; + } + name = skip_quoted(&s, "=", " ", 0); + // Value is either quote-delimited, or ends at first comma or space. + if (s[0] == '\"') { + s++; + value = skip_quoted(&s, "\"", " ", '\\'); + if (s[0] == ',') { + s++; + } + } else { + value = skip_quoted(&s, ", ", " ", 0); // IE uses commas, FF uses spaces + } + if (*name == '\0') { + break; + } + + if (!strcmp(name, "username")) { + ah->user = value; + } else if (!strcmp(name, "cnonce")) { + ah->cnonce = value; + } else if (!strcmp(name, "response")) { + ah->response = value; + } else if (!strcmp(name, "uri")) { + ah->uri = value; + } else if (!strcmp(name, "qop")) { + ah->qop = value; + } else if (!strcmp(name, "nc")) { + ah->nc = value; + } else if (!strcmp(name, "nonce")) { + ah->nonce = value; + } + } + + // CGI needs it as REMOTE_USER + if (ah->user != NULL) { + conn->request_info.remote_user = mg_strdup(ah->user); + } else { + return 0; + } + + return 1; +} + +// Authorize against the opened passwords file. Return 1 if authorized. +static int authorize(struct mg_connection *conn, FILE *fp) { + struct ah ah; + char line[256], f_user[256], ha1[256], f_domain[256], buf[MG_BUF_LEN]; + + if (!parse_auth_header(conn, buf, sizeof(buf), &ah)) { + return 0; + } + + // Loop over passwords file + while (fgets(line, sizeof(line), fp) != NULL) { + if (sscanf(line, "%[^:]:%[^:]:%s", f_user, f_domain, ha1) != 3) { + continue; + } + + if (!strcmp(ah.user, f_user) && + !strcmp(conn->ctx->config[AUTHENTICATION_DOMAIN], f_domain)) + return check_password( + conn->request_info.request_method, + ha1, ah.uri, ah.nonce, ah.nc, ah.cnonce, ah.qop, + ah.response); + } + + return 0; +} + +// Return 1 if request is authorised, 0 otherwise. +static int check_authorization(struct mg_connection *conn, const char *path) { + FILE *fp; + char fname[PATH_MAX]; + struct vec uri_vec, filename_vec; + const char *list; + int authorized; + + fp = NULL; + authorized = 1; + + list = conn->ctx->config[PROTECT_URI]; + while ((list = next_option(list, &uri_vec, &filename_vec)) != NULL) { + if (!memcmp(conn->request_info.uri, uri_vec.ptr, uri_vec.len)) { + mg_snprintf(conn, fname, sizeof(fname), "%.*s", + (int) filename_vec.len, filename_vec.ptr); + if ((fp = mg_fopen(fname, "r")) == NULL) { + cry(conn, "%s: cannot open %s: %s", __func__, fname, strerror(errno)); + } + break; + } + } + + if (fp == NULL) { + fp = open_auth_file(conn, path); + } + + if (fp != NULL) { + authorized = authorize(conn, fp); + (void) fclose(fp); + } + + return authorized; +} + +static void send_authorization_request(struct mg_connection *conn) { + conn->status_code = 401; + (void) mg_printf(conn, + "HTTP/1.1 401 Unauthorized\r\n" + "Content-Length: 0\r\n" + "WWW-Authenticate: Digest qop=\"auth\", " + "realm=\"%s\", nonce=\"%lu\"\r\n\r\n", + conn->ctx->config[AUTHENTICATION_DOMAIN], + (unsigned long) time(NULL)); +} + +static int is_authorized_for_put(struct mg_connection *conn) { + FILE *fp; + int ret = 0; + + fp = conn->ctx->config[PUT_DELETE_PASSWORDS_FILE] == NULL ? NULL : + mg_fopen(conn->ctx->config[PUT_DELETE_PASSWORDS_FILE], "r"); + + if (fp != NULL) { + ret = authorize(conn, fp); + (void) fclose(fp); + } + + return ret; +} + +int mg_modify_passwords_file(const char *fname, const char *domain, + const char *user, const char *pass) { + int found; + char line[512], u[512], d[512], ha1[33], tmp[PATH_MAX]; + FILE *fp, *fp2; + + found = 0; + fp = fp2 = NULL; + + // Regard empty password as no password - remove user record. + if (pass != NULL && pass[0] == '\0') { + pass = NULL; + } + + (void) snprintf(tmp, sizeof(tmp), "%s.tmp", fname); + + // Create the file if does not exist + if ((fp = mg_fopen(fname, "a+")) != NULL) { + (void) fclose(fp); + } + + // Open the given file and temporary file + if ((fp = mg_fopen(fname, "r")) == NULL) { + return 0; + } else if ((fp2 = mg_fopen(tmp, "w+")) == NULL) { + fclose(fp); + return 0; + } + + // Copy the stuff to temporary file + while (fgets(line, sizeof(line), fp) != NULL) { + if (sscanf(line, "%[^:]:%[^:]:%*s", u, d) != 2) { + continue; + } + + if (!strcmp(u, user) && !strcmp(d, domain)) { + found++; + if (pass != NULL) { + mg_md5(ha1, user, ":", domain, ":", pass, NULL); + fprintf(fp2, "%s:%s:%s\n", user, domain, ha1); + } + } else { + (void) fprintf(fp2, "%s", line); + } + } + + // If new user, just add it + if (!found && pass != NULL) { + mg_md5(ha1, user, ":", domain, ":", pass, NULL); + (void) fprintf(fp2, "%s:%s:%s\n", user, domain, ha1); + } + + // Close files + (void) fclose(fp); + (void) fclose(fp2); + + // Put the temp file in place of real file + (void) mg_remove(fname); + (void) mg_rename(tmp, fname); + + return 1; +} + +struct de { + struct mg_connection *conn; + char *file_name; + struct mgstat st; +}; + +static void url_encode(const char *src, char *dst, size_t dst_len) { + static const char *dont_escape = "._-$,;~()"; + static const char *hex = "0123456789abcdef"; + const char *end = dst + dst_len - 1; + + for (; *src != '\0' && dst < end; src++, dst++) { + if (isalnum(*(const unsigned char *) src) || + strchr(dont_escape, * (const unsigned char *) src) != NULL) { + *dst = *src; + } else if (dst + 2 < end) { + dst[0] = '%'; + dst[1] = hex[(* (const unsigned char *) src) >> 4]; + dst[2] = hex[(* (const unsigned char *) src) & 0xf]; + dst += 2; + } + } + + *dst = '\0'; +} + +static void print_dir_entry(struct de *de) { + char size[64], mod[64], href[PATH_MAX]; + + if (de->st.is_directory) { + (void) mg_snprintf(de->conn, size, sizeof(size), "%s", "[DIRECTORY]"); + } else { + // We use (signed) cast below because MSVC 6 compiler cannot + // convert unsigned __int64 to double. Sigh. + if (de->st.size < 1024) { + (void) mg_snprintf(de->conn, size, sizeof(size), + "%lu", (unsigned long) de->st.size); + } else if (de->st.size < 0x100000) { + (void) mg_snprintf(de->conn, size, sizeof(size), + "%.1fk", (double) de->st.size / 1024.0); + } else if (de->st.size < 0x40000000) { + (void) mg_snprintf(de->conn, size, sizeof(size), + "%.1fM", (double) de->st.size / 1048576); + } else { + (void) mg_snprintf(de->conn, size, sizeof(size), + "%.1fG", (double) de->st.size / 1073741824); + } + } + (void) strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M", localtime(&de->st.mtime)); + url_encode(de->file_name, href, sizeof(href)); + de->conn->num_bytes_sent += mg_printf(de->conn, + "<tr><td><a href=\"%s%s%s\">%s%s</a></td>" + "<td> %s</td><td> %s</td></tr>\n", + de->conn->request_info.uri, href, de->st.is_directory ? "/" : "", + de->file_name, de->st.is_directory ? "/" : "", mod, size); +} + +// This function is called from send_directory() and used for +// sorting directory entries by size, or name, or modification time. +// On windows, __cdecl specification is needed in case if project is built +// with __stdcall convention. qsort always requires __cdels callback. +static int WINCDECL compare_dir_entries(const void *p1, const void *p2) { + const struct de *a = (const struct de *) p1, *b = (const struct de *) p2; + const char *query_string = a->conn->request_info.query_string; + int cmp_result = 0; + + if (query_string == NULL) { + query_string = "na"; + } + + if (a->st.is_directory && !b->st.is_directory) { + return -1; // Always put directories on top + } else if (!a->st.is_directory && b->st.is_directory) { + return 1; // Always put directories on top + } else if (*query_string == 'n') { + cmp_result = strcmp(a->file_name, b->file_name); + } else if (*query_string == 's') { + cmp_result = a->st.size == b->st.size ? 0 : + a->st.size > b->st.size ? 1 : -1; + } else if (*query_string == 'd') { + cmp_result = a->st.mtime == b->st.mtime ? 0 : + a->st.mtime > b->st.mtime ? 1 : -1; + } + + return query_string[1] == 'd' ? -cmp_result : cmp_result; +} + +static int must_hide_file(struct mg_connection *conn, const char *path) { + const char *pw_pattern = "**" PASSWORDS_FILE_NAME "$"; + const char *pattern = conn->ctx->config[HIDE_FILES]; + return match_prefix(pw_pattern, strlen(pw_pattern), path) > 0 || + (pattern != NULL && match_prefix(pattern, strlen(pattern), path) > 0); +} + +static int scan_directory(struct mg_connection *conn, const char *dir, + void *data, void (*cb)(struct de *, void *)) { + char path[PATH_MAX]; + struct dirent *dp; + DIR *dirp; + struct de de; + + if ((dirp = opendir(dir)) == NULL) { + return 0; + } else { + de.conn = conn; + + while ((dp = readdir(dirp)) != NULL) { + // Do not show current dir and hidden files + if (!strcmp(dp->d_name, ".") || + !strcmp(dp->d_name, "..") || + must_hide_file(conn, dp->d_name)) { + continue; + } + + mg_snprintf(conn, path, sizeof(path), "%s%c%s", dir, '/', dp->d_name); + + // If we don't memset stat structure to zero, mtime will have + // garbage and strftime() will segfault later on in + // print_dir_entry(). memset is required only if mg_stat() + // fails. For more details, see + // http://code.google.com/p/mongoose/issues/detail?id=79 + if (mg_stat(path, &de.st) != 0) { + memset(&de.st, 0, sizeof(de.st)); + } + de.file_name = dp->d_name; + + cb(&de, data); + } + (void) closedir(dirp); + } + return 1; +} + +struct dir_scan_data { + struct de *entries; + int num_entries; + int arr_size; +}; + +static void dir_scan_callback(struct de *de, void *data) { + struct dir_scan_data *dsd = (struct dir_scan_data *) data; + + if (dsd->entries == NULL || dsd->num_entries >= dsd->arr_size) { + dsd->arr_size *= 2; + dsd->entries = (struct de *) realloc(dsd->entries, dsd->arr_size * + sizeof(dsd->entries[0])); + } + if (dsd->entries == NULL) { + // TODO(lsm): propagate an error to the caller + dsd->num_entries = 0; + } else { + dsd->entries[dsd->num_entries].file_name = mg_strdup(de->file_name); + dsd->entries[dsd->num_entries].st = de->st; + dsd->entries[dsd->num_entries].conn = de->conn; + dsd->num_entries++; + } +} + +static void handle_directory_request(struct mg_connection *conn, + const char *dir) { + int i, sort_direction; + struct dir_scan_data data = { NULL, 0, 128 }; + + if (!scan_directory(conn, dir, &data, dir_scan_callback)) { + send_http_error(conn, 500, "Cannot open directory", + "Error: opendir(%s): %s", dir, strerror(ERRNO)); + return; + } + + sort_direction = conn->request_info.query_string != NULL && + conn->request_info.query_string[1] == 'd' ? 'a' : 'd'; + + conn->must_close = 1; + mg_printf(conn, "%s", + "HTTP/1.1 200 OK\r\n" + "Connection: close\r\n" + "Content-Type: text/html; charset=utf-8\r\n\r\n"); + + conn->num_bytes_sent += mg_printf(conn, + "<html><head><title>Index of %s</title>" + "<style>th {text-align: left;}</style></head>" + "<body><h1>Index of %s</h1><pre><table cellpadding=\"0\">" + "<tr><th><a href=\"?n%c\">Name</a></th>" + "<th><a href=\"?d%c\">Modified</a></th>" + "<th><a href=\"?s%c\">Size</a></th></tr>" + "<tr><td colspan=\"3\"><hr></td></tr>", + conn->request_info.uri, conn->request_info.uri, + sort_direction, sort_direction, sort_direction); + + // Print first entry - link to a parent directory + conn->num_bytes_sent += mg_printf(conn, + "<tr><td><a href=\"%s%s\">%s</a></td>" + "<td> %s</td><td> %s</td></tr>\n", + conn->request_info.uri, "..", "Parent directory", "-", "-"); + + // Sort and print directory entries + qsort(data.entries, (size_t) data.num_entries, sizeof(data.entries[0]), + compare_dir_entries); + for (i = 0; i < data.num_entries; i++) { + print_dir_entry(&data.entries[i]); + free(data.entries[i].file_name); + } + free(data.entries); + + conn->num_bytes_sent += mg_printf(conn, "%s", "</table></body></html>"); + conn->status_code = 200; +} + +// Send len bytes from the opened file to the client. +static void send_file_data(struct mg_connection *conn, FILE *fp, int64_t len) { + char buf[MG_BUF_LEN]; + int to_read, num_read, num_written; + + while (len > 0) { + // Calculate how much to read from the file in the buffer + to_read = sizeof(buf); + if ((int64_t) to_read > len) { + to_read = (int) len; + } + + // Read from file, exit the loop on error + if ((num_read = fread(buf, 1, (size_t)to_read, fp)) <= 0) { + break; + } + + // Send read bytes to the client, exit the loop on error + if ((num_written = mg_write(conn, buf, (size_t)num_read)) != num_read) { + break; + } + + // Both read and were successful, adjust counters + conn->num_bytes_sent += num_written; + len -= num_written; + } +} + +static int parse_range_header(const char *header, int64_t *a, int64_t *b) { + return sscanf(header, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b); +} + +static void gmt_time_string(char *buf, size_t buf_len, time_t *t) { + strftime(buf, buf_len, "%a, %d %b %Y %H:%M:%S GMT", gmtime(t)); +} + +static void construct_etag(char *buf, size_t buf_len, + const struct mgstat *stp) { + snprintf(buf, buf_len, "\"%lx.%" INT64_FMT "\"", + (unsigned long) stp->mtime, stp->size); +} + +static void handle_file_request(struct mg_connection *conn, const char *path, + struct mgstat *stp) { + char date[64], lm[64], etag[64], range[64]; + const char *msg = "OK", *hdr; + time_t curtime = time(NULL); + int64_t cl, r1, r2; + struct vec mime_vec; + FILE *fp; + int n; + + get_mime_type(conn->ctx, path, &mime_vec); + cl = stp->size; + conn->status_code = 200; + range[0] = '\0'; + + if ((fp = mg_fopen(path, "rb")) == NULL) { + send_http_error(conn, 500, http_500_error, + "fopen(%s): %s", path, strerror(ERRNO)); + return; + } + set_close_on_exec(fileno(fp)); + + // If Range: header specified, act accordingly + r1 = r2 = 0; + hdr = mg_get_header(conn, "Range"); + if (hdr != NULL && (n = parse_range_header(hdr, &r1, &r2)) > 0) { + conn->status_code = 206; + (void) fseeko(fp, r1, SEEK_SET); + cl = n == 2 ? r2 - r1 + 1: cl - r1; + (void) mg_snprintf(conn, range, sizeof(range), + "Content-Range: bytes " + "%" INT64_FMT "-%" + INT64_FMT "/%" INT64_FMT "\r\n", + r1, r1 + cl - 1, stp->size); + msg = "Partial Content"; + } + + // Prepare Etag, Date, Last-Modified headers. Must be in UTC, according to + // http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3 + gmt_time_string(date, sizeof(date), &curtime); + gmt_time_string(lm, sizeof(lm), &stp->mtime); + construct_etag(etag, sizeof(etag), stp); + + (void) mg_printf(conn, + "HTTP/1.1 %d %s\r\n" + "Date: %s\r\n" + "Last-Modified: %s\r\n" + "Etag: %s\r\n" + "Content-Type: %.*s\r\n" + "Content-Length: %" INT64_FMT "\r\n" + "Connection: %s\r\n" + "Accept-Ranges: bytes\r\n" + "%s\r\n", + conn->status_code, msg, date, lm, etag, (int) mime_vec.len, + mime_vec.ptr, cl, suggest_connection_header(conn), range); + + if (strcmp(conn->request_info.request_method, "HEAD") != 0) { + send_file_data(conn, fp, cl); + } + (void) fclose(fp); +} + +void mg_send_file(struct mg_connection *conn, const char *path) { + struct mgstat st; + if (mg_stat(path, &st) == 0) { + handle_file_request(conn, path, &st); + } else { + send_http_error(conn, 404, "Not Found", "%s", "File not found"); + } +} + + +// Parse HTTP headers from the given buffer, advance buffer to the point +// where parsing stopped. +static void parse_http_headers(char **buf, struct mg_request_info *ri) { + int i; + + for (i = 0; i < (int) ARRAY_SIZE(ri->http_headers); i++) { + ri->http_headers[i].name = skip_quoted(buf, ":", " ", 0); + ri->http_headers[i].value = skip(buf, "\r\n"); + if (ri->http_headers[i].name[0] == '\0') + break; + ri->num_headers = i + 1; + } +} + +static int is_valid_http_method(const char *method) { + return !strcmp(method, "GET") || !strcmp(method, "POST") || + !strcmp(method, "HEAD") || !strcmp(method, "CONNECT") || + !strcmp(method, "PUT") || !strcmp(method, "DELETE") || + !strcmp(method, "OPTIONS") || !strcmp(method, "PROPFIND"); +} + +// Parse HTTP request, fill in mg_request_info structure. +// This function modifies the buffer by NUL-terminating +// HTTP request components, header names and header values. +static int parse_http_message(char *buf, int len, struct mg_request_info *ri) { + int request_length = get_request_len(buf, len); + if (request_length > 0) { + // Reset attributes. DO NOT TOUCH is_ssl, remote_ip, remote_port + ri->remote_user = ri->request_method = ri->uri = ri->http_version = NULL; + ri->num_headers = 0; + + buf[request_length - 1] = '\0'; + + // RFC says that all initial whitespaces should be ingored + while (*buf != '\0' && isspace(* (unsigned char *) buf)) { + buf++; + } + ri->request_method = skip(&buf, " "); + ri->uri = skip(&buf, " "); + ri->http_version = skip(&buf, "\r\n"); + parse_http_headers(&buf, ri); + } + return request_length; +} + +static int parse_http_request(char *buf, int len, struct mg_request_info *ri) { + int result = parse_http_message(buf, len, ri); + if (result > 0 && + is_valid_http_method(ri->request_method) && + !strncmp(ri->http_version, "HTTP/", 5)) { + ri->http_version += 5; // Skip "HTTP/" + } else { + result = -1; + } + return result; +} + +static int parse_http_response(char *buf, int len, struct mg_request_info *ri) { + int result = parse_http_message(buf, len, ri); + return result > 0 && !strncmp(ri->request_method, "HTTP/", 5) ? result : -1; +} + +// Keep reading the input (either opened file descriptor fd, or socket sock, +// or SSL descriptor ssl) into buffer buf, until \r\n\r\n appears in the +// buffer (which marks the end of HTTP request). Buffer buf may already +// have some data. The length of the data is stored in nread. +// Upon every read operation, increase nread by the number of bytes read. +static int read_request(FILE *fp, struct mg_connection *conn, + char *buf, int bufsiz, int *nread) { + int request_len, n = 1; + + request_len = get_request_len(buf, *nread); + while (*nread < bufsiz && request_len == 0 && n > 0) { + n = pull(fp, conn, buf + *nread, bufsiz - *nread); + if (n > 0) { + *nread += n; + request_len = get_request_len(buf, *nread); + } + } + + if (n < 0) { + // recv() error -> propagate error; do not process a b0rked-with-very-high-probability request + return -1; + } + return request_len; +} + +// For given directory path, substitute it to valid index file. +// Return 0 if index file has been found, -1 if not found. +// If the file is found, it's stats is returned in stp. +static int substitute_index_file(struct mg_connection *conn, char *path, + size_t path_len, struct mgstat *stp) { + const char *list = conn->ctx->config[INDEX_FILES]; + struct mgstat st; + struct vec filename_vec; + size_t n = strlen(path); + int found = 0; + + // The 'path' given to us points to the directory. Remove all trailing + // directory separator characters from the end of the path, and + // then append single directory separator character. + while (n > 0 && path[n - 1] == '/') { + n--; + } + path[n] = '/'; + + // Traverse index files list. For each entry, append it to the given + // path and see if the file exists. If it exists, break the loop + while ((list = next_option(list, &filename_vec, NULL)) != NULL) { + + // Ignore too long entries that may overflow path buffer + if (filename_vec.len > path_len - (n + 2)) + continue; + + // Prepare full path to the index file + (void) mg_strlcpy(path + n + 1, filename_vec.ptr, filename_vec.len + 1); + + // Does it exist? + if (mg_stat(path, &st) == 0) { + // Yes it does, break the loop + *stp = st; + found = 1; + break; + } + } + + // If no index file exists, restore directory path + if (!found) { + path[n] = '\0'; + } + + return found; +} + +// Return True if we should reply 304 Not Modified. +static int is_not_modified(const struct mg_connection *conn, + const struct mgstat *stp) { + char etag[64]; + const char *ims = mg_get_header(conn, "If-Modified-Since"); + const char *inm = mg_get_header(conn, "If-None-Match"); + construct_etag(etag, sizeof(etag), stp); + return (inm != NULL && !mg_strcasecmp(etag, inm)) || + (ims != NULL && stp->mtime <= parse_date_string(ims)); +} + +static int forward_body_data(struct mg_connection *conn, FILE *fp, + SOCKET sock, SSL *ssl) { + const char *expect, *body; + char buf[MG_BUF_LEN]; + int to_read, nread, buffered_len, success = 0; + + expect = mg_get_header(conn, "Expect"); + assert(fp != NULL); + + if (conn->content_len == -1) { + send_http_error(conn, 411, "Length Required", "%s", ""); + } else if (expect != NULL && mg_strcasecmp(expect, "100-continue")) { + send_http_error(conn, 417, "Expectation Failed", "%s", ""); + } else { + if (expect != NULL) { + (void) mg_printf(conn, "%s", "HTTP/1.1 100 Continue\r\n\r\n"); + } + + body = conn->buf + conn->request_len + conn->consumed_content; + buffered_len = &conn->buf[conn->data_len] - body; + assert(buffered_len >= 0); + assert(conn->consumed_content == 0); + + if (buffered_len > 0) { + if ((int64_t) buffered_len > conn->content_len) { + buffered_len = (int) conn->content_len; + } + push(fp, sock, ssl, body, (int64_t) buffered_len); + conn->consumed_content += buffered_len; + } + + nread = 0; + while (conn->consumed_content < conn->content_len) { + to_read = sizeof(buf); + if ((int64_t) to_read > conn->content_len - conn->consumed_content) { + to_read = (int) (conn->content_len - conn->consumed_content); + } + nread = pull(NULL, conn, buf, to_read); + if (nread <= 0 || push(fp, sock, ssl, buf, nread) != nread) { + break; + } + conn->consumed_content += nread; + } + + if (conn->consumed_content == conn->content_len) { + success = nread >= 0; + } + + // Each error code path in this function must send an error + if (!success) { + send_http_error(conn, 577, http_500_error, "%s", ""); + } + } + + return success; +} + +#if !defined(NO_CGI) +// This structure helps to create an environment for the spawned CGI program. +// Environment is an array of "VARIABLE=VALUE\0" ASCIIZ strings, +// last element must be NULL. +// However, on Windows there is a requirement that all these VARIABLE=VALUE\0 +// strings must reside in a contiguous buffer. The end of the buffer is +// marked by two '\0' characters. +// We satisfy both worlds: we create an envp array (which is vars), all +// entries are actually pointers inside buf. +struct cgi_env_block { + struct mg_connection *conn; + char buf[CGI_ENVIRONMENT_SIZE]; // Environment buffer + int len; // Space taken + char *vars[MAX_CGI_ENVIR_VARS]; // char **envp + int nvars; // Number of variables +}; + +static char *addenv(struct cgi_env_block *block, + PRINTF_FORMAT_STRING(const char *fmt), ...) + PRINTF_ARGS(2, 3); + +// Append VARIABLE=VALUE\0 string to the buffer, and add a respective +// pointer into the vars array. +static char *addenv(struct cgi_env_block *block, const char *fmt, ...) { + int n, space; + char *added; + va_list ap; + + // Calculate how much space is left in the buffer + space = sizeof(block->buf) - block->len - 2; + assert(space >= 0); + + // Make a pointer to the free space int the buffer + added = block->buf + block->len; + + // Copy VARIABLE=VALUE\0 string into the free space + va_start(ap, fmt); + n = mg_vsnprintf(block->conn, added, (size_t) space, fmt, ap); + va_end(ap); + + // Make sure we do not overflow buffer and the envp array + if (n > 0 && n + 1 < space && + block->nvars < (int) ARRAY_SIZE(block->vars) - 2) { + // Append a pointer to the added string into the envp array + block->vars[block->nvars++] = added; + // Bump up used length counter. Include \0 terminator + block->len += n + 1; + } else { + cry(block->conn, "%s: CGI env buffer truncated for [%s]", __func__, fmt); + } + + return added; +} + +static void prepare_cgi_environment(struct mg_connection *conn, + const char *prog, + struct cgi_env_block *blk) { + const char *s, *slash; + struct vec var_vec; + char *p, src_addr[20]; + int i; + + blk->len = blk->nvars = 0; + blk->conn = conn; + sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa); + + addenv(blk, "SERVER_NAME=%s", conn->ctx->config[AUTHENTICATION_DOMAIN]); + addenv(blk, "SERVER_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]); + addenv(blk, "DOCUMENT_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]); + + // Prepare the environment block + addenv(blk, "%s", "GATEWAY_INTERFACE=CGI/1.1"); + addenv(blk, "%s", "SERVER_PROTOCOL=HTTP/1.1"); + addenv(blk, "%s", "REDIRECT_STATUS=200"); // For PHP + + // TODO(lsm): fix this for IPv6 case + addenv(blk, "SERVER_PORT=%d", ntohs(conn->client.lsa.sin.sin_port)); + + addenv(blk, "REQUEST_METHOD=%s", conn->request_info.request_method); + addenv(blk, "REMOTE_ADDR=%s", src_addr); + addenv(blk, "REMOTE_PORT=%d", conn->request_info.remote_port); + addenv(blk, "REQUEST_URI=%s", conn->request_info.uri); + + // SCRIPT_NAME + assert(conn->request_info.uri[0] == '/'); + slash = strrchr(conn->request_info.uri, '/'); + if ((s = strrchr(prog, '/')) == NULL) + s = prog; + addenv(blk, "SCRIPT_NAME=%.*s%s", (int) (slash - conn->request_info.uri), + conn->request_info.uri, s); + + addenv(blk, "SCRIPT_FILENAME=%s", prog); + addenv(blk, "PATH_TRANSLATED=%s", prog); + addenv(blk, "HTTPS=%s", conn->ssl == NULL ? "off" : "on"); + + if ((s = mg_get_header(conn, "Content-Type")) != NULL) + addenv(blk, "CONTENT_TYPE=%s", s); + + if (conn->request_info.query_string != NULL) + addenv(blk, "QUERY_STRING=%s", conn->request_info.query_string); + + if ((s = mg_get_header(conn, "Content-Length")) != NULL) + addenv(blk, "CONTENT_LENGTH=%s", s); + + if ((s = getenv("PATH")) != NULL) + addenv(blk, "PATH=%s", s); + + if (conn->path_info != NULL) { + addenv(blk, "PATH_INFO=%s", conn->path_info); + } + +#if defined(_WIN32) + if ((s = getenv("COMSPEC")) != NULL) { + addenv(blk, "COMSPEC=%s", s); + } + if ((s = getenv("SYSTEMROOT")) != NULL) { + addenv(blk, "SYSTEMROOT=%s", s); + } + if ((s = getenv("SystemDrive")) != NULL) { + addenv(blk, "SystemDrive=%s", s); + } +#else + if ((s = getenv("LD_LIBRARY_PATH")) != NULL) + addenv(blk, "LD_LIBRARY_PATH=%s", s); +#endif // _WIN32 + + if ((s = getenv("PERLLIB")) != NULL) + addenv(blk, "PERLLIB=%s", s); + + if (conn->request_info.remote_user != NULL) { + addenv(blk, "REMOTE_USER=%s", conn->request_info.remote_user); + addenv(blk, "%s", "AUTH_TYPE=Digest"); + } + + // Add all headers as HTTP_* variables + for (i = 0; i < conn->request_info.num_headers; i++) { + p = addenv(blk, "HTTP_%s=%s", + conn->request_info.http_headers[i].name, + conn->request_info.http_headers[i].value); + + // Convert variable name into uppercase, and change - to _ + for (; *p != '=' && *p != '\0'; p++) { + if (*p == '-') + *p = '_'; + *p = (char) toupper(* (unsigned char *) p); + } + } + + // Add user-specified variables + s = conn->ctx->config[CGI_ENVIRONMENT]; + while ((s = next_option(s, &var_vec, NULL)) != NULL) { + addenv(blk, "%.*s", (int) var_vec.len, var_vec.ptr); + } + + blk->vars[blk->nvars++] = NULL; + blk->buf[blk->len++] = '\0'; + + assert(blk->nvars < (int) ARRAY_SIZE(blk->vars)); + assert(blk->len > 0); + assert(blk->len < (int) sizeof(blk->buf)); +} + +static void handle_cgi_request(struct mg_connection *conn, const char *prog) { + int headers_len, data_len, i, fd_stdin[2], fd_stdout[2]; + const char *status, *status_text; + char buf[16384], *pbuf, dir[PATH_MAX], *p; + struct mg_request_info ri; + struct cgi_env_block blk; + FILE *in, *out; + pid_t pid; + + prepare_cgi_environment(conn, prog, &blk); + + // CGI must be executed in its own directory. 'dir' must point to the + // directory containing executable program, 'p' must point to the + // executable program name relative to 'dir'. + (void) mg_snprintf(conn, dir, sizeof(dir), "%s", prog); + if ((p = strrchr(dir, '/')) != NULL) { + *p++ = '\0'; + } else { + dir[0] = '.', dir[1] = '\0'; + p = (char *) prog; + } + + pid = (pid_t) -1; + fd_stdin[0] = fd_stdin[1] = fd_stdout[0] = fd_stdout[1] = -1; + in = out = NULL; + + if (pipe(fd_stdin) != 0 || pipe(fd_stdout) != 0) { + send_http_error(conn, 500, http_500_error, + "Cannot create CGI pipe: %s", strerror(ERRNO)); + goto done; + } else if ((pid = spawn_process(conn, p, blk.buf, blk.vars, + fd_stdin[0], fd_stdout[1], dir)) == (pid_t) -1) { + send_http_error(conn, 500, http_500_error, + "Cannot spawn CGI process [%s]: %s", prog, strerror(ERRNO)); + goto done; + } + + // spawn_process() must close those! + // If we don't mark them as closed, close() attempt before + // return from this function throws an exception on Windows. + // Windows does not like when closed descriptor is closed again. + fd_stdin[0] = fd_stdout[1] = -1; + + if ((in = fdopen(fd_stdin[1], "wb")) == NULL || + (out = fdopen(fd_stdout[0], "rb")) == NULL) { + send_http_error(conn, 500, http_500_error, + "fopen: %s", strerror(ERRNO)); + goto done; + } + + setbuf(in, NULL); + setbuf(out, NULL); + + // Send POST data to the CGI process if needed + if (!strcmp(conn->request_info.request_method, "POST") && + !forward_body_data(conn, in, INVALID_SOCKET, NULL)) { + goto done; + } + + // Close so child gets an EOF. + fclose(in); + in = NULL; + fd_stdin[1] = -1; + + // Now read CGI reply into a buffer. We need to set correct + // status code, thus we need to see all HTTP headers first. + // Do not send anything back to client, until we buffer in all + // HTTP headers. + data_len = 0; + headers_len = read_request(out, conn, buf, sizeof(buf), &data_len); + if (headers_len <= 0) { + send_http_error(conn, 500, http_500_error, + "CGI program sent malformed or too big (>%u bytes) " + "HTTP headers: [%.*s]", + (unsigned) sizeof(buf), data_len, buf); + goto done; + } + pbuf = buf; + buf[headers_len - 1] = '\0'; + parse_http_headers(&pbuf, &ri); + + // Make up and send the status line + status_text = "OK"; + if ((status = get_header(&ri, "Status")) != NULL) { + conn->status_code = atoi(status); + status_text = status; + while (isdigit(* (unsigned char *) status_text) || *status_text == ' ') { + status_text++; + } + } else if (get_header(&ri, "Location") != NULL) { + conn->status_code = 302; + } else { + conn->status_code = 200; + } + if (get_header(&ri, "Connection") != NULL && + !mg_strcasecmp(get_header(&ri, "Connection"), "keep-alive")) { + conn->must_close = 1; + } + (void) mg_printf(conn, "HTTP/1.1 %d %s\r\n", conn->status_code, + status_text); + + // Send headers + for (i = 0; i < ri.num_headers; i++) { + mg_printf(conn, "%s: %s\r\n", + ri.http_headers[i].name, ri.http_headers[i].value); + } + (void) mg_write(conn, "\r\n", 2); + + // Send chunk of data that may have been read after the headers + conn->num_bytes_sent += mg_write(conn, buf + headers_len, + (size_t)(data_len - headers_len)); + + // Read the rest of CGI output and send to the client + send_file_data(conn, out, INT64_MAX); + +done: + if (pid != (pid_t) -1) { + kill(pid, SIGKILL); + } + if (fd_stdin[0] != -1) { + (void) close(fd_stdin[0]); + } + if (fd_stdout[1] != -1) { + (void) close(fd_stdout[1]); + } + + if (in != NULL) { + (void) fclose(in); + } else if (fd_stdin[1] != -1) { + (void) close(fd_stdin[1]); + } + + if (out != NULL) { + (void) fclose(out); + } else if (fd_stdout[0] != -1) { + (void) close(fd_stdout[0]); + } +} +#endif // !NO_CGI + +// For a given PUT path, create all intermediate subdirectories +// for given path. Return 0 if the path itself is a directory, +// or -1 on error, 1 if OK. +static int put_dir(const char *path) { + char buf[PATH_MAX]; + const char *s, *p; + struct mgstat st; + int len, res = 1; + + for (s = p = path + 2; (p = strchr(s, '/')) != NULL; s = ++p) { + len = p - path; + if (len >= (int) sizeof(buf)) { + res = -1; + break; + } + memcpy(buf, path, len); + buf[len] = '\0'; + + // Try to create intermediate directory + DEBUG_TRACE(("mkdir(%s)", buf)); + if (mg_stat(buf, &st) == -1 && mg_mkdir(buf, 0755) != 0) { + res = -1; + break; + } + + // Is path itself a directory? + if (p[1] == '\0') { + res = 0; + } + } + + return res; +} + +static void put_file(struct mg_connection *conn, const char *path) { + struct mgstat st; + const char *range; + int64_t r1, r2; + FILE *fp; + int rc; + + conn->status_code = mg_stat(path, &st) == 0 ? 200 : 201; + + if ((rc = put_dir(path)) == 0) { + mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->status_code); + } else if (rc == -1) { + send_http_error(conn, 500, http_500_error, + "put_dir(%s): %s", path, strerror(ERRNO)); + } else if ((fp = mg_fopen(path, "wb+")) == NULL) { + send_http_error(conn, 500, http_500_error, + "fopen(%s): %s", path, strerror(ERRNO)); + } else { + set_close_on_exec(fileno(fp)); + range = mg_get_header(conn, "Content-Range"); + r1 = r2 = 0; + if (range != NULL && parse_range_header(range, &r1, &r2) > 0) { + conn->status_code = 206; + // TODO(lsm): handle seek error + (void) fseeko(fp, r1, SEEK_SET); + } + if (forward_body_data(conn, fp, INVALID_SOCKET, NULL)) { + (void) mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->status_code); + } + (void) fclose(fp); + } +} + +static void send_ssi_file(struct mg_connection *, const char *, FILE *, int); + +static void do_ssi_include(struct mg_connection *conn, const char *ssi, + char *tag, int include_level) { + char file_name[MG_BUF_LEN], path[PATH_MAX], *p; + FILE *fp; + + // sscanf() is safe here, since send_ssi_file() also uses buffer + // of size MG_BUF_LEN to get the tag. So strlen(tag) is always < MG_BUF_LEN. + if (sscanf(tag, " virtual=\"%[^\"]\"", file_name) == 1) { + // File name is relative to the webserver root + (void) mg_snprintf(conn, path, sizeof(path), "%s%c%s", + conn->ctx->config[DOCUMENT_ROOT], '/', file_name); + } else if (sscanf(tag, " file=\"%[^\"]\"", file_name) == 1) { + // File name is relative to the webserver working directory + // or it is absolute system path + (void) mg_snprintf(conn, path, sizeof(path), "%s", file_name); + } else if (sscanf(tag, " \"%[^\"]\"", file_name) == 1) { + // File name is relative to the currect document + (void) mg_snprintf(conn, path, sizeof(path), "%s", ssi); + if ((p = strrchr(path, '/')) != NULL) { + p[1] = '\0'; + } + (void) mg_snprintf(conn, path + strlen(path), + sizeof(path) - strlen(path), "%s", file_name); + } else { + cry(conn, "Bad SSI #include: [%s]", tag); + return; + } + + if ((fp = mg_fopen(path, "rb")) == NULL) { + cry(conn, "Cannot open SSI #include: [%s]: fopen(%s): %s", + tag, path, strerror(ERRNO)); + } else { + set_close_on_exec(fileno(fp)); + if (match_prefix(conn->ctx->config[SSI_EXTENSIONS], + strlen(conn->ctx->config[SSI_EXTENSIONS]), path) > 0) { + send_ssi_file(conn, path, fp, include_level + 1); + } else { + send_file_data(conn, fp, INT64_MAX); + } + (void) fclose(fp); + } +} + +#if !defined(NO_POPEN) +static void do_ssi_exec(struct mg_connection *conn, char *tag) { + char cmd[MG_BUF_LEN]; + FILE *fp; + + if (sscanf(tag, " \"%[^\"]\"", cmd) != 1) { + cry(conn, "Bad SSI #exec: [%s]", tag); + } else if ((fp = popen(cmd, "r")) == NULL) { + cry(conn, "Cannot SSI #exec: [%s]: %s", cmd, strerror(ERRNO)); + } else { + send_file_data(conn, fp, INT64_MAX); + (void) pclose(fp); + } +} +#endif // !NO_POPEN + +static void send_ssi_file(struct mg_connection *conn, const char *path, + FILE *fp, int include_level) { + char buf[MG_BUF_LEN]; + int ch, len, in_ssi_tag; + + if (include_level > 10) { + cry(conn, "SSI #include level is too deep (%s)", path); + return; + } + + in_ssi_tag = 0; + len = 0; + + while ((ch = fgetc(fp)) != EOF) { + if (in_ssi_tag && ch == '>') { + in_ssi_tag = 0; + buf[len++] = (char) ch; + buf[len] = '\0'; + assert(len <= (int) sizeof(buf)); + if (len < 6 || memcmp(buf, "<!--#", 5) != 0) { + // Not an SSI tag, pass it + (void) mg_write(conn, buf, (size_t)len); + } else { + if (!memcmp(buf + 5, "include", 7)) { + do_ssi_include(conn, path, buf + 12, include_level); +#if !defined(NO_POPEN) + } else if (!memcmp(buf + 5, "exec", 4)) { + do_ssi_exec(conn, buf + 9); +#endif // !NO_POPEN + } else { + cry(conn, "%s: unknown SSI " "command: \"%s\"", path, buf); + } + } + len = 0; + } else if (in_ssi_tag) { + if (len == 5 && memcmp(buf, "<!--#", 5) != 0) { + // Not an SSI tag + in_ssi_tag = 0; + } else if (len == (int) sizeof(buf) - 2) { + cry(conn, "%s: SSI tag is too large", path); + len = 0; + } + buf[len++] = ch & 0xff; + } else if (ch == '<') { + in_ssi_tag = 1; + if (len > 0) { + (void) mg_write(conn, buf, (size_t)len); + } + len = 0; + buf[len++] = ch & 0xff; + } else { + buf[len++] = ch & 0xff; + if (len == (int) sizeof(buf)) { + (void) mg_write(conn, buf, (size_t)len); + len = 0; + } + } + } + + // Send the rest of buffered data + if (len > 0) { + (void) mg_write(conn, buf, (size_t)len); + } +} + +static void handle_ssi_file_request(struct mg_connection *conn, + const char *path) { + FILE *fp; + + if ((fp = mg_fopen(path, "rb")) == NULL) { + send_http_error(conn, 500, http_500_error, "fopen(%s): %s", path, + strerror(ERRNO)); + } else { + conn->must_close = 1; + set_close_on_exec(fileno(fp)); + mg_printf(conn, "HTTP/1.1 200 OK\r\n" + "Content-Type: text/html\r\nConnection: %s\r\n\r\n", + suggest_connection_header(conn)); + send_ssi_file(conn, path, fp, 0); + (void) fclose(fp); + } +} + +static void send_options(struct mg_connection *conn) { + conn->status_code = 200; + + (void) mg_printf(conn, + "HTTP/1.1 200 OK\r\n" + "Allow: GET, POST, HEAD, CONNECT, PUT, DELETE, OPTIONS\r\n" + "DAV: 1\r\n\r\n"); +} + +// Writes PROPFIND properties for a collection element +static void print_props(struct mg_connection *conn, const char* uri, + struct mgstat* st) { + char mtime[64]; + gmt_time_string(mtime, sizeof(mtime), &st->mtime); + conn->num_bytes_sent += mg_printf(conn, + "<d:response>" + "<d:href>%s</d:href>" + "<d:propstat>" + "<d:prop>" + "<d:resourcetype>%s</d:resourcetype>" + "<d:getcontentlength>%" INT64_FMT "</d:getcontentlength>" + "<d:getlastmodified>%s</d:getlastmodified>" + "</d:prop>" + "<d:status>HTTP/1.1 200 OK</d:status>" + "</d:propstat>" + "</d:response>\n", + uri, + st->is_directory ? "<d:collection/>" : "", + st->size, + mtime); +} + +static void print_dav_dir_entry(struct de *de, void *data) { + char href[PATH_MAX]; + struct mg_connection *conn = (struct mg_connection *) data; + mg_snprintf(conn, href, sizeof(href), "%s%s", + conn->request_info.uri, de->file_name); + print_props(conn, href, &de->st); +} + +static void handle_propfind(struct mg_connection *conn, const char* path, + struct mgstat* st) { + const char *depth = mg_get_header(conn, "Depth"); + + conn->must_close = 1; + conn->status_code = 207; + mg_printf(conn, "HTTP/1.1 207 Multi-Status\r\n" + "Connection: close\r\n" + "Content-Type: text/xml; charset=utf-8\r\n\r\n"); + + conn->num_bytes_sent += mg_printf(conn, + "<?xml version=\"1.0\" encoding=\"utf-8\"?>" + "<d:multistatus xmlns:d='DAV:'>\n"); + + // Print properties for the requested resource itself + print_props(conn, conn->request_info.uri, st); + + // If it is a directory, print directory entries too if Depth is not 0 + if (st->is_directory && + !mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes") && + (depth == NULL || strcmp(depth, "0") != 0)) { + scan_directory(conn, path, conn, &print_dav_dir_entry); + } + + conn->num_bytes_sent += mg_printf(conn, "%s\n", "</d:multistatus>"); +} + +#if defined(USE_WEBSOCKET) + +// START OF SHA-1 code +// Copyright(c) By Steve Reid <steve@edmweb.com> +#define SHA1HANDSOFF +#if defined(__sun) +#include "solarisfixes.h" +#endif +#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits)))) +#if BYTE_ORDER == LITTLE_ENDIAN +#define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \ + |(rol(block->l[i],8)&0x00FF00FF)) +#elif BYTE_ORDER == BIG_ENDIAN +#define blk0(i) block->l[i] +#else +#error "Endianness not defined!" +#endif +#define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \ + ^block->l[(i+2)&15]^block->l[i&15],1)) +#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30); +#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30); +#define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30); +#define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30); +#define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30); + +typedef struct { + uint32_t state[5]; + uint32_t count[2]; + unsigned char buffer[64]; +} SHA1_CTX; + +static void SHA1Transform(uint32_t state[5], const unsigned char buffer[64]) { + uint32_t a, b, c, d, e; + typedef union { unsigned char c[64]; uint32_t l[16]; } CHAR64LONG16; + + CHAR64LONG16 block[1]; + memcpy(block, buffer, 64); + a = state[0]; + b = state[1]; + c = state[2]; + d = state[3]; + e = state[4]; + R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3); + R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7); + R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11); + R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15); + R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19); + R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23); + R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27); + R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31); + R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35); + R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39); + R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43); + R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47); + R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51); + R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55); + R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59); + R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63); + R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67); + R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71); + R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75); + R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79); + state[0] += a; + state[1] += b; + state[2] += c; + state[3] += d; + state[4] += e; + a = b = c = d = e = 0; + memset(block, '\0', sizeof(block)); +} + +static void SHA1Init(SHA1_CTX* context) { + context->state[0] = 0x67452301; + context->state[1] = 0xEFCDAB89; + context->state[2] = 0x98BADCFE; + context->state[3] = 0x10325476; + context->state[4] = 0xC3D2E1F0; + context->count[0] = context->count[1] = 0; +} + +static void SHA1Update(SHA1_CTX* context, const unsigned char* data, + uint32_t len) { + uint32_t i, j; + + j = context->count[0]; + if ((context->count[0] += len << 3) < j) + context->count[1]++; + context->count[1] += (len>>29); + j = (j >> 3) & 63; + if ((j + len) > 63) { + memcpy(&context->buffer[j], data, (i = 64-j)); + SHA1Transform(context->state, context->buffer); + for ( ; i + 63 < len; i += 64) { + SHA1Transform(context->state, &data[i]); + } + j = 0; + } + else i = 0; + memcpy(&context->buffer[j], &data[i], len - i); +} + +static void SHA1Final(unsigned char digest[20], SHA1_CTX* context) { + unsigned i; + unsigned char finalcount[8], c; + + for (i = 0; i < 8; i++) { + finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)] + >> ((3-(i & 3)) * 8) ) & 255); + } + c = 0200; + SHA1Update(context, &c, 1); + while ((context->count[0] & 504) != 448) { + c = 0000; + SHA1Update(context, &c, 1); + } + SHA1Update(context, finalcount, 8); + for (i = 0; i < 20; i++) { + digest[i] = (unsigned char) + ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255); + } + memset(context, '\0', sizeof(*context)); + memset(&finalcount, '\0', sizeof(finalcount)); +} +// END OF SHA1 CODE + +static void base64_encode(const unsigned char *src, int src_len, char *dst) { + static const char *b64 = + "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; + int i, j, a, b, c; + + for (i = j = 0; i < src_len; i += 3) { + a = src[i]; + b = i + 1 >= src_len ? 0 : src[i + 1]; + c = i + 2 >= src_len ? 0 : src[i + 2]; + + dst[j++] = b64[a >> 2]; + dst[j++] = b64[((a & 3) << 4) | (b >> 4)]; + if (i + 1 < src_len) { + dst[j++] = b64[(b & 15) << 2 | (c >> 6)]; + } + if (i + 2 < src_len) { + dst[j++] = b64[c & 63]; + } + } + while (j % 4 != 0) { + dst[j++] = '='; + } + dst[j++] = '\0'; +} + +static void send_websocket_handshake(struct mg_connection *conn) { + static const char *magic = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"; + char buf[100], sha[20], b64_sha[sizeof(sha) * 2]; + SHA1_CTX sha_ctx; + + mg_snprintf(conn, buf, sizeof(buf), "%s%s", + mg_get_header(conn, "Sec-WebSocket-Key"), magic); + SHA1Init(&sha_ctx); + SHA1Update(&sha_ctx, (unsigned char *) buf, strlen(buf)); + SHA1Final((unsigned char *) sha, &sha_ctx); + base64_encode((unsigned char *) sha, sizeof(sha), b64_sha); + mg_printf(conn, "%s%s%s", + "HTTP/1.1 101 Switching Protocols\r\n" + "Upgrade: websocket\r\n" + "Connection: Upgrade\r\n" + "Sec-WebSocket-Accept: ", b64_sha, "\r\n\r\n"); +} + +static void read_websocket(struct mg_connection *conn) { + unsigned char *mask, *buf = (unsigned char *) conn->buf + conn->request_len; + int n, len, mask_len, body_len, discard_len; + + for (;;) { + if ((body_len = conn->data_len - conn->request_len) >= 2) { + len = buf[1] & 127; + mask_len = buf[1] & 128 ? 4 : 0; + if (len < 126) { + conn->content_len = 2 + mask_len + len; + mask = buf + 2; + } else if (len == 126 && body_len >= 4) { + conn->content_len = 2 + mask_len + ((((int) buf[2]) << 8) + buf[3]); + mask = buf + 4; + } else if (body_len >= 10) { + conn->content_len = 2 + mask_len + + ((uint64_t) htonl(* (uint32_t *) &buf[2])) << 32 | + htonl(* (uint32_t *) &buf[6]); + mask = buf + 10; + } + } + + if (conn->content_len > 0) { + if (call_user(conn, MG_WEBSOCKET_MESSAGE) != NULL) { + break; // Callback signalled to exit + } + discard_len = conn->content_len > body_len ? body_len : conn->content_len; + memmove(buf, buf + discard_len, conn->data_len - discard_len); + conn->data_len -= discard_len; + conn->content_len = conn->consumed_content = 0; + } else { + if (wait_until_socket_is_readable(conn) == 0) { + break; + } + n = pull(NULL, conn, conn->buf + conn->data_len, + conn->buf_size - conn->data_len); + if (n <= 0) { + break; + } + conn->data_len += n; + } + } +} + +static void handle_websocket_request(struct mg_connection *conn) { + if (strcmp(mg_get_header(conn, "Sec-WebSocket-Version"), "13") != 0) { + send_http_error(conn, 426, "Upgrade Required", "%s", "Upgrade Required"); + } else if (call_user(conn, MG_WEBSOCKET_CONNECT) != NULL) { + // Callback has returned non-NULL, do not proceed with handshake + } else { + send_websocket_handshake(conn); + call_user(conn, MG_WEBSOCKET_READY); + read_websocket(conn); + call_user(conn, MG_WEBSOCKET_CLOSE); + } +} + +static int is_websocket_request(const struct mg_connection *conn) { + const char *host, *upgrade, *connection, *version, *key; + + host = mg_get_header(conn, "Host"); + upgrade = mg_get_header(conn, "Upgrade"); + connection = mg_get_header(conn, "Connection"); + key = mg_get_header(conn, "Sec-WebSocket-Key"); + version = mg_get_header(conn, "Sec-WebSocket-Version"); + + return host != NULL && upgrade != NULL && connection != NULL && + key != NULL && version != NULL && + !mg_strcasecmp(upgrade, "websocket") && + !mg_strcasecmp(connection, "Upgrade"); +} +#endif // !USE_WEBSOCKET + +static int isbyte(int n) { + return n >= 0 && n <= 255; +} + +static int parse_net(const char *spec, uint32_t *net, uint32_t *mask) { + int n, a, b, c, d, slash = 32, len = 0; + + if ((sscanf(spec, "%d.%d.%d.%d/%d%n", &a, &b, &c, &d, &slash, &n) == 5 || + sscanf(spec, "%d.%d.%d.%d%n", &a, &b, &c, &d, &n) == 4) && + isbyte(a) && isbyte(b) && isbyte(c) && isbyte(d) && + slash >= 0 && slash < 33) { + len = n; + *net = ((uint32_t)a << 24) | ((uint32_t)b << 16) | ((uint32_t)c << 8) | d; + *mask = slash ? 0xffffffffU << (32 - slash) : 0; + } + + return len; +} + +static int set_throttle(const char *spec, uint32_t remote_ip, const char *uri) { + int throttle = 0; + struct vec vec, val; + uint32_t net, mask; + char mult; + double v; + + while ((spec = next_option(spec, &vec, &val)) != NULL) { + mult = ','; + if (sscanf(val.ptr, "%lf%c", &v, &mult) < 1 || v < 0 || + (lowercase(&mult) != 'k' && lowercase(&mult) != 'm' && mult != ',')) { + continue; + } + v *= lowercase(&mult) == 'k' ? 1024 : lowercase(&mult) == 'm' ? 1048576 : 1; + if (vec.len == 1 && vec.ptr[0] == '*') { + throttle = (int) v; + } else if (parse_net(vec.ptr, &net, &mask) > 0) { + if ((remote_ip & mask) == net) { + throttle = (int) v; + } + } else if (match_prefix(vec.ptr, vec.len, uri) > 0) { + throttle = (int) v; + } + } + + return throttle; +} + +static uint32_t get_remote_ip(const struct mg_connection *conn) { + return ntohl(* (uint32_t *) &conn->client.rsa.sin.sin_addr); +} + +// This is the heart of the Mongoose's logic. +// This function is called when the request is read, parsed and validated, +// and Mongoose must decide what action to take: serve a file, or +// a directory, or call embedded function, etcetera. +static void handle_request(struct mg_connection *conn) { + struct mg_request_info *ri = &conn->request_info; + char path[PATH_MAX]; + int stat_result, uri_len; + struct mgstat st; + + if ((conn->request_info.query_string = strchr(ri->uri, '?')) != NULL) { + *conn->request_info.query_string++ = '\0'; + } + uri_len = (int) strlen(ri->uri); + url_decode(ri->uri, (size_t)uri_len, ri->uri, (size_t)(uri_len + 1), 0); + remove_double_dots_and_double_slashes(ri->uri); + stat_result = convert_uri_to_file_name(conn, path, sizeof(path), &st); + conn->throttle = set_throttle(conn->ctx->config[THROTTLE], + get_remote_ip(conn), ri->uri); + + DEBUG_TRACE(("%s", ri->uri)); + if (!check_authorization(conn, path)) { + send_authorization_request(conn); +#if defined(USE_WEBSOCKET) + } else if (is_websocket_request(conn)) { + handle_websocket_request(conn); +#endif + } else if (call_user(conn, MG_NEW_REQUEST) != NULL) { + // Do nothing, callback has served the request + } else if (!strcmp(ri->request_method, "OPTIONS")) { + send_options(conn); + } else if (conn->ctx->config[DOCUMENT_ROOT] == NULL) { + send_http_error(conn, 404, "Not Found", "Not Found"); + } else if ((!strcmp(ri->request_method, "PUT") || + !strcmp(ri->request_method, "DELETE")) && + (conn->ctx->config[PUT_DELETE_PASSWORDS_FILE] == NULL || + is_authorized_for_put(conn) != 1)) { + send_authorization_request(conn); + } else if (!strcmp(ri->request_method, "PUT")) { + put_file(conn, path); + } else if (!strcmp(ri->request_method, "DELETE")) { + if (mg_remove(path) == 0) { + send_http_error(conn, 200, "OK", "%s", ""); + } else { + send_http_error(conn, 500, http_500_error, "remove(%s): %s", path, + strerror(ERRNO)); + } + } else if (stat_result != 0 || must_hide_file(conn, path)) { + send_http_error(conn, 404, "Not Found", "%s", "File not found"); + } else if (st.is_directory && ri->uri[uri_len - 1] != '/') { + (void) mg_printf(conn, "HTTP/1.1 301 Moved Permanently\r\n" + "Location: %s/\r\n\r\n", ri->uri); + } else if (!strcmp(ri->request_method, "PROPFIND")) { + handle_propfind(conn, path, &st); + } else if (st.is_directory && + !substitute_index_file(conn, path, sizeof(path), &st)) { + if (!mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes")) { + handle_directory_request(conn, path); + } else { + send_http_error(conn, 403, "Directory Listing Denied", + "Directory listing denied"); + } +#if !defined(NO_CGI) + } else if (match_prefix(conn->ctx->config[CGI_EXTENSIONS], + strlen(conn->ctx->config[CGI_EXTENSIONS]), + path) > 0) { + if (strcmp(ri->request_method, "POST") && + strcmp(ri->request_method, "GET")) { + send_http_error(conn, 501, "Not Implemented", + "Method %s is not implemented", ri->request_method); + } else { + handle_cgi_request(conn, path); + } +#endif // !NO_CGI + } else if (match_prefix(conn->ctx->config[SSI_EXTENSIONS], + strlen(conn->ctx->config[SSI_EXTENSIONS]), + path) > 0) { + handle_ssi_file_request(conn, path); + } else if (is_not_modified(conn, &st)) { + send_http_error(conn, 304, "Not Modified", "%s", ""); + } else { + handle_file_request(conn, path, &st); + } +} + +static void close_all_listening_sockets(struct mg_context *ctx) { + struct socket *sp, *tmp; + for (sp = ctx->listening_sockets; sp != NULL; sp = tmp) { + tmp = sp->next; + (void) closesocket(sp->sock); + free(sp); + } +} + +// Valid listening port specification is: [ip_address:]port[s] +// Examples: 80, 443s, 127.0.0.1:3128, 1.2.3.4:8080s +// TODO(lsm): add parsing of the IPv6 address +static int parse_port_string(const struct vec *vec, struct socket *so) { + int a, b, c, d, port, len; + + // MacOS needs that. If we do not zero it, subsequent bind() will fail. + // Also, all-zeroes in the socket address means binding to all addresses + // for both IPv4 and IPv6 (INADDR_ANY and IN6ADDR_ANY_INIT). + memset(so, 0, sizeof(*so)); + + if (sscanf(vec->ptr, "%d.%d.%d.%d:%d%n", &a, &b, &c, &d, &port, &len) == 5) { + // Bind to a specific IPv4 address + so->lsa.sin.sin_addr.s_addr = htonl((a << 24) | (b << 16) | (c << 8) | d); + } else if (sscanf(vec->ptr, "%d%n", &port, &len) != 1 || + len <= 0 || + len > (int) vec->len || + (vec->ptr[len] && vec->ptr[len] != 's' && vec->ptr[len] != ',')) { + return 0; + } + + so->is_ssl = vec->ptr[len] == 's'; +#if defined(USE_IPV6) + so->lsa.sin6.sin6_family = AF_INET6; + so->lsa.sin6.sin6_port = htons((uint16_t) port); +#else + so->lsa.sin.sin_family = AF_INET; + so->lsa.sin.sin_port = htons((uint16_t) port); +#endif + + return 1; +} + +static int set_ports_option(struct mg_context *ctx) { + const char *list = ctx->config[LISTENING_PORTS]; + int on = 1, success = 1; + SOCKET sock; + struct vec vec; + struct socket so, *listener; + + while (success && (list = next_option(list, &vec, NULL)) != NULL) { + if (!parse_port_string(&vec, &so)) { + cry(fc(ctx), "%s: %.*s: invalid port spec. Expecting list of: %s", + __func__, (int) vec.len, vec.ptr, "[IP_ADDRESS:]PORT[s|p]"); + success = 0; + } else if (so.is_ssl && + (ctx->ssl_ctx == NULL || ctx->config[SSL_CERTIFICATE] == NULL)) { + cry(fc(ctx), "Cannot add SSL socket, is -ssl_certificate option set?"); + success = 0; + } else if ((sock = socket(so.lsa.sa.sa_family, SOCK_STREAM, 6)) == + INVALID_SOCKET || + // On Windows, SO_REUSEADDR is recommended only for + // broadcast UDP sockets + setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (const char *) &on, + sizeof(on)) != 0 || + // Set TCP keep-alive. This is needed because if HTTP-level + // keep-alive is enabled, and client resets the connection, + // server won't get TCP FIN or RST and will keep the connection + // open forever. With TCP keep-alive, next keep-alive + // handshake will figure out that the client is down and + // will close the server end. + // Thanks to Igor Klopov who suggested the patch. + setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (char *) &on, + sizeof(on)) != 0 || + bind(sock, &so.lsa.sa, sizeof(so.lsa)) != 0 || + listen(sock, SOMAXCONN) != 0) { + closesocket(sock); + cry(fc(ctx), "%s: cannot bind to %.*s: %s", __func__, + (int) vec.len, vec.ptr, strerror(ERRNO)); + success = 0; + } else if ((listener = (struct socket *) + calloc(1, sizeof(*listener))) == NULL) { + // NOTE(lsm): order is important: call cry before closesocket(), + // cause closesocket() alters the errno. + cry(fc(ctx), "%s: %s", __func__, strerror(ERRNO)); + closesocket(sock); + success = 0; + } else { + *listener = so; + listener->sock = sock; + set_close_on_exec(listener->sock); + listener->next = ctx->listening_sockets; + ctx->listening_sockets = listener; + } + } + + if (!success) { + close_all_listening_sockets(ctx); + } + + return success; +} + +static void log_header(const struct mg_connection *conn, const char *header, + FILE *fp) { + const char *header_value; + + if ((header_value = mg_get_header(conn, header)) == NULL) { + (void) fprintf(fp, "%s", " -"); + } else { + (void) fprintf(fp, " \"%s\"", header_value); + } +} + +static void log_access(const struct mg_connection *conn) { + const struct mg_request_info *ri; + FILE *fp; + char date[64], src_addr[20]; + + fp = conn->ctx->config[ACCESS_LOG_FILE] == NULL ? NULL : + mg_fopen(conn->ctx->config[ACCESS_LOG_FILE], "a+"); + + if (fp == NULL) + return; + + strftime(date, sizeof(date), "%d/%b/%Y:%H:%M:%S %z", + localtime(&conn->birth_time)); + + ri = &conn->request_info; + flockfile(fp); + + sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa); + fprintf(fp, "%s - %s [%s] \"%s %s HTTP/%s\" %d %" INT64_FMT, + src_addr, ri->remote_user == NULL ? "-" : ri->remote_user, date, + ri->request_method ? ri->request_method : "-", + ri->uri ? ri->uri : "-", ri->http_version, + conn->status_code, conn->num_bytes_sent); + log_header(conn, "Referer", fp); + log_header(conn, "User-Agent", fp); + fputc('\n', fp); + fflush(fp); + + funlockfile(fp); + fclose(fp); +} + +// Verify given socket address against the ACL. +// Return -1 if ACL is malformed, 0 if address is disallowed, 1 if allowed. +static int check_acl(struct mg_context *ctx, uint32_t remote_ip) { + int allowed, flag; + uint32_t net, mask; + struct vec vec; + const char *list = ctx->config[ACCESS_CONTROL_LIST]; + + // If any ACL is set, deny by default + allowed = list == NULL ? '+' : '-'; + + while ((list = next_option(list, &vec, NULL)) != NULL) { + flag = vec.ptr[0]; + if ((flag != '+' && flag != '-') || + parse_net(&vec.ptr[1], &net, &mask) == 0) { + cry(fc(ctx), "%s: subnet must be [+|-]x.x.x.x[/x]", __func__); + return -1; + } + + if (net == (remote_ip & mask)) { + allowed = flag; + } + } + + return allowed == '+'; +} + +static void add_to_set(SOCKET fd, fd_set *set, int *max_fd) { + FD_SET(fd, set); + if (fd > (SOCKET) *max_fd) { + *max_fd = (int) fd; + } +} + +#if !defined(_WIN32) +static int set_uid_option(struct mg_context *ctx) { + struct passwd *pw; + const char *uid = ctx->config[RUN_AS_USER]; + int success = 0; + + if (uid == NULL) { + success = 1; + } else { + if ((pw = getpwnam(uid)) == NULL) { + cry(fc(ctx), "%s: unknown user [%s]", __func__, uid); + } else if (setgid(pw->pw_gid) == -1) { + cry(fc(ctx), "%s: setgid(%s): %s", __func__, uid, strerror(errno)); + } else if (setuid(pw->pw_uid) == -1) { + cry(fc(ctx), "%s: setuid(%s): %s", __func__, uid, strerror(errno)); + } else { + success = 1; + } + } + + return success; +} +#endif // !_WIN32 + +#if !defined(NO_SSL) +static pthread_mutex_t *ssl_mutexes; + +// Return OpenSSL error message +static const char *ssl_error(void) { + unsigned long err; + err = ERR_get_error(); + return err == 0 ? "" : ERR_error_string(err, NULL); +} + +static void ssl_locking_callback(int mode, int mutex_num, const char *file, + int line) { + line = 0; // Unused + file = NULL; // Unused + + if (mode & CRYPTO_LOCK) { + (void) pthread_mutex_lock(&ssl_mutexes[mutex_num]); + } else { + (void) pthread_mutex_unlock(&ssl_mutexes[mutex_num]); + } +} + +static unsigned long ssl_id_callback(void) { + return (unsigned long) pthread_self(); +} + +#if !defined(NO_SSL_DL) +static int load_dll(struct mg_context *ctx, const char *dll_name, + struct ssl_func *sw) { + union {void *p; void (*fp)(void);} u; + void *dll_handle; + struct ssl_func *fp; + + if ((dll_handle = dlopen(dll_name, RTLD_LAZY)) == NULL) { + cry(fc(ctx), "%s: cannot load %s", __func__, dll_name); + return 0; + } + + for (fp = sw; fp->name != NULL; fp++) { +#ifdef _WIN32 + // GetProcAddress() returns pointer to function + u.fp = (void (*)(void)) dlsym(dll_handle, fp->name); +#else + // dlsym() on UNIX returns void *. ISO C forbids casts of data pointers to + // function pointers. We need to use a union to make a cast. + u.p = dlsym(dll_handle, fp->name); +#endif // _WIN32 + if (u.fp == NULL) { + cry(fc(ctx), "%s: %s: cannot find %s", __func__, dll_name, fp->name); + return 0; + } else { + fp->ptr = u.fp; + } + } + + return 1; +} +#endif // NO_SSL_DL + +// Dynamically load SSL library. Set up ctx->ssl_ctx pointer. +static int set_ssl_option(struct mg_context *ctx) { + int i, size; + const char *pem; + + // If PEM file is not specified, skip SSL initialization. + if ((pem = ctx->config[SSL_CERTIFICATE]) == NULL) { + return 1; + } + +#if !defined(NO_SSL_DL) + if (!load_dll(ctx, SSL_LIB, ssl_sw) || + !load_dll(ctx, CRYPTO_LIB, crypto_sw)) { + return 0; + } +#endif // NO_SSL_DL + + // Initialize SSL crap + SSL_library_init(); + SSL_load_error_strings(); + + if ((ctx->client_ssl_ctx = SSL_CTX_new(SSLv23_client_method())) == NULL) { + cry(fc(ctx), "SSL_CTX_new (client) error: %s", ssl_error()); + } + + if ((ctx->ssl_ctx = SSL_CTX_new(SSLv23_server_method())) == NULL) { + cry(fc(ctx), "SSL_CTX_new (server) error: %s", ssl_error()); + return 0; + } + + // If user callback returned non-NULL, that means that user callback has + // set up certificate itself. In this case, skip sertificate setting. + if (call_user(fc(ctx), MG_INIT_SSL) == NULL && + (SSL_CTX_use_certificate_file(ctx->ssl_ctx, pem, SSL_FILETYPE_PEM) == 0 || + SSL_CTX_use_PrivateKey_file(ctx->ssl_ctx, pem, SSL_FILETYPE_PEM) == 0)) { + cry(fc(ctx), "%s: cannot open %s: %s", __func__, pem, ssl_error()); + return 0; + } + + if (pem != NULL) { + (void) SSL_CTX_use_certificate_chain_file(ctx->ssl_ctx, pem); + } + + // Initialize locking callbacks, needed for thread safety. + // http://www.openssl.org/support/faq.html#PROG1 + size = sizeof(pthread_mutex_t) * CRYPTO_num_locks(); + if ((ssl_mutexes = (pthread_mutex_t *) malloc((size_t)size)) == NULL) { + cry(fc(ctx), "%s: cannot allocate mutexes: %s", __func__, ssl_error()); + return 0; + } + + for (i = 0; i < CRYPTO_num_locks(); i++) { + pthread_mutex_init(&ssl_mutexes[i], NULL); + } + + CRYPTO_set_locking_callback(&ssl_locking_callback); + CRYPTO_set_id_callback(&ssl_id_callback); + + return 1; +} + +static void uninitialize_ssl(struct mg_context *ctx) { + int i; + if (ctx->ssl_ctx != NULL) { + CRYPTO_set_locking_callback(NULL); + for (i = 0; i < CRYPTO_num_locks(); i++) { + pthread_mutex_destroy(&ssl_mutexes[i]); + } + CRYPTO_set_locking_callback(NULL); + CRYPTO_set_id_callback(NULL); + } +} +#endif // !NO_SSL + +static int set_gpass_option(struct mg_context *ctx) { + struct mgstat mgstat; + const char *path = ctx->config[GLOBAL_PASSWORDS_FILE]; + return path == NULL || mg_stat(path, &mgstat) == 0; +} + +static int set_acl_option(struct mg_context *ctx) { + return check_acl(ctx, (uint32_t) 0x7f000001UL) != -1; +} + +static void reset_per_request_attributes(struct mg_connection *conn) { + conn->path_info = conn->log_message = NULL; + conn->num_bytes_sent = conn->consumed_content = 0; + conn->status_code = -1; + conn->must_close = conn->request_len = conn->throttle = 0; +} + +static void close_socket_gracefully(struct mg_connection *conn) { + char buf[MG_BUF_LEN]; + struct linger linger; + int n, sock = conn->client.sock; + + // Set linger option to avoid socket hanging out after close. This prevent + // ephemeral port exhaust problem under high QPS. + linger.l_onoff = 1; + linger.l_linger = 1; + setsockopt(sock, SOL_SOCKET, SO_LINGER, (char *) &linger, sizeof(linger)); + + // Send FIN to the client + (void) shutdown(sock, SHUT_WR); + set_non_blocking_mode(sock); + + // Read and discard pending incoming data. If we do not do that and close the + // socket, the data in the send buffer may be discarded. This + // behaviour is seen on Windows, when client keeps sending data + // when server decides to close the connection; then when client + // does recv() it gets no data back. + do { + n = pull(NULL, conn, buf, sizeof(buf)); + } while (n > 0); + + // Now we know that our FIN is ACK-ed, safe to close + (void) closesocket(sock); +} + +static void close_connection(struct mg_connection *conn) { + if (conn->ssl) { + SSL_free(conn->ssl); + conn->ssl = NULL; + } + + if (conn->client.sock != INVALID_SOCKET) { + close_socket_gracefully(conn); + } +} + +void mg_close_connection(struct mg_connection *conn) { + close_connection(conn); + free(conn); +} + +struct mg_connection *mg_connect(struct mg_context *ctx, + const char *host, int port, int use_ssl) { + struct mg_connection *newconn = NULL; + struct sockaddr_in sin; + struct hostent *he; + int sock; + + if (use_ssl && (ctx == NULL || ctx->client_ssl_ctx == NULL)) { + cry(fc(ctx), "%s: SSL is not initialized", __func__); + } else if ((he = gethostbyname(host)) == NULL) { + cry(fc(ctx), "%s: gethostbyname(%s): %s", __func__, host, strerror(ERRNO)); + } else if ((sock = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) { + cry(fc(ctx), "%s: socket: %s", __func__, strerror(ERRNO)); + } else { + sin.sin_family = AF_INET; + sin.sin_port = htons((uint16_t) port); + sin.sin_addr = * (struct in_addr *) he->h_addr_list[0]; + if (connect(sock, (struct sockaddr *) &sin, sizeof(sin)) != 0) { + cry(fc(ctx), "%s: connect(%s:%d): %s", __func__, host, port, + strerror(ERRNO)); + closesocket(sock); + } else if ((newconn = (struct mg_connection *) + calloc(1, sizeof(*newconn))) == NULL) { + cry(fc(ctx), "%s: calloc: %s", __func__, strerror(ERRNO)); + closesocket(sock); + } else { + newconn->ctx = ctx; + newconn->client.sock = sock; + newconn->client.rsa.sin = sin; + newconn->client.is_ssl = use_ssl; + if (use_ssl) { + sslize(newconn, ctx->client_ssl_ctx, SSL_connect); + } + } + } + + return newconn; +} + +FILE *mg_fetch(struct mg_context *ctx, const char *url, const char *path, + char *buf, size_t buf_len, struct mg_request_info *ri) { + struct mg_connection *newconn; + int n, req_length, data_length, port; + char host[1025], proto[10], buf2[MG_BUF_LEN]; + FILE *fp = NULL; + + if (sscanf(url, "%9[htps]://%1024[^:]:%d/%n", proto, host, &port, &n) == 3) { + } else if (sscanf(url, "%9[htps]://%1024[^/]/%n", proto, host, &n) == 2) { + port = mg_strcasecmp(proto, "https") == 0 ? 443 : 80; + } else { + cry(fc(ctx), "%s: invalid URL: [%s]", __func__, url); + return NULL; + } + + if ((newconn = mg_connect(ctx, host, port, + !strcmp(proto, "https"))) == NULL) { + cry(fc(ctx), "%s: mg_connect(%s): %s", __func__, url, strerror(ERRNO)); + } else { + mg_printf(newconn, "GET /%s HTTP/1.0\r\nHost: %s\r\n\r\n", url + n, host); + data_length = 0; + req_length = read_request(NULL, newconn, buf, buf_len, &data_length); + if (req_length <= 0) { + cry(fc(ctx), "%s(%s): invalid HTTP reply", __func__, url); + } else if (parse_http_response(buf, req_length, ri) <= 0) { + cry(fc(ctx), "%s(%s): cannot parse HTTP headers", __func__, url); + } else if ((fp = fopen(path, "w+b")) == NULL) { + cry(fc(ctx), "%s: fopen(%s): %s", __func__, path, strerror(ERRNO)); + } else { + // Write chunk of data that may be in the user's buffer + data_length -= req_length; + if (data_length > 0 && + fwrite(buf + req_length, 1, data_length, fp) != (size_t) data_length) { + cry(fc(ctx), "%s: fwrite(%s): %s", __func__, path, strerror(ERRNO)); + fclose(fp); + fp = NULL; + } + // Read the rest of the response and write it to the file. Do not use + // mg_read() cause we didn't set newconn->content_len properly. + while (fp && (data_length = pull(0, newconn, buf2, sizeof(buf2))) > 0) { + if (fwrite(buf2, 1, data_length, fp) != (size_t) data_length) { + cry(fc(ctx), "%s: fwrite(%s): %s", __func__, path, strerror(ERRNO)); + fclose(fp); + fp = NULL; + break; + } + } + } + mg_close_connection(newconn); + } + + return fp; +} + +static int is_valid_uri(const char *uri) { + // Conform to http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5.1.2 + // URI can be an asterisk (*) or should start with slash. + return uri[0] == '/' || (uri[0] == '*' && uri[1] == '\0'); +} + +static void process_new_connection(struct mg_connection *conn) { + struct mg_request_info *ri = &conn->request_info; + int keep_alive_enabled, discard_len; + const char *cl; + + keep_alive_enabled = !strcmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes"); + + do { + reset_per_request_attributes(conn); + conn->request_len = read_request(NULL, conn, conn->buf, conn->buf_size, + &conn->data_len); + assert(conn->request_len < 0 || conn->data_len >= conn->request_len); + if (conn->request_len == 0 && conn->data_len == conn->buf_size) { + send_http_error(conn, 413, "Request Too Large", "%s", ""); + return; + } if (conn->request_len <= 0) { + return; // Remote end closed the connection + } + if (parse_http_request(conn->buf, conn->buf_size, ri) <= 0 || + !is_valid_uri(ri->uri)) { + // Do not put garbage in the access log, just send it back to the client + send_http_error(conn, 400, "Bad Request", + "Cannot parse HTTP request: [%.*s]", conn->data_len, conn->buf); + conn->must_close = 1; + } else if (strcmp(ri->http_version, "1.0") && + strcmp(ri->http_version, "1.1")) { + // Request seems valid, but HTTP version is strange + send_http_error(conn, 505, "HTTP version not supported", "%s", ""); + log_access(conn); + } else { + // Request is valid, handle it + if ((cl = get_header(ri, "Content-Length")) != NULL) { + conn->content_len = strtoll(cl, NULL, 10); + } else if (!mg_strcasecmp(ri->request_method, "POST") || + !mg_strcasecmp(ri->request_method, "PUT")) { + conn->content_len = -1; + } else { + conn->content_len = 0; + } + conn->birth_time = time(NULL); + handle_request(conn); + call_user(conn, MG_REQUEST_COMPLETE); + log_access(conn); + } + if (ri->remote_user != NULL) { + free((void *) ri->remote_user); + } + + // Discard all buffered data for this request + discard_len = conn->content_len >= 0 && + conn->request_len + conn->content_len < (int64_t) conn->data_len ? + (int) (conn->request_len + conn->content_len) : conn->data_len; + memmove(conn->buf, conn->buf + discard_len, conn->data_len - discard_len); + conn->data_len -= discard_len; + assert(conn->data_len >= 0); + assert(conn->data_len <= conn->buf_size); + + } while (conn->ctx->stop_flag == 0 && + keep_alive_enabled && + conn->content_len >= 0 && + should_keep_alive(conn)); +} + +// Worker threads take accepted socket from the queue +static int consume_socket(struct mg_context *ctx, struct socket *sp) { + (void) pthread_mutex_lock(&ctx->mutex); + DEBUG_TRACE(("going idle")); + + // If the queue is empty, wait. We're idle at this point. + while (ctx->sq_head == ctx->sq_tail && ctx->stop_flag == 0) { + pthread_cond_wait(&ctx->sq_full, &ctx->mutex); + } + + // If we're stopping, sq_head may be equal to sq_tail. + if (ctx->sq_head > ctx->sq_tail) { + // Copy socket from the queue and increment tail + *sp = ctx->queue[ctx->sq_tail % ARRAY_SIZE(ctx->queue)]; + ctx->sq_tail++; + DEBUG_TRACE(("grabbed socket %d, going busy", sp->sock)); + + // Wrap pointers if needed + while (ctx->sq_tail > (int) ARRAY_SIZE(ctx->queue)) { + ctx->sq_tail -= ARRAY_SIZE(ctx->queue); + ctx->sq_head -= ARRAY_SIZE(ctx->queue); + } + } + + (void) pthread_cond_signal(&ctx->sq_empty); + (void) pthread_mutex_unlock(&ctx->mutex); + + return !ctx->stop_flag; +} + +static void worker_thread(struct mg_context *ctx) { + struct mg_connection *conn; + + conn = (struct mg_connection *) calloc(1, sizeof(*conn) + MAX_REQUEST_SIZE); + if (conn == NULL) { + cry(fc(ctx), "%s", "Cannot create new connection struct, OOM"); + } else { + conn->buf_size = MAX_REQUEST_SIZE; + conn->buf = (char *) (conn + 1); + + // Call consume_socket() even when ctx->stop_flag > 0, to let it signal + // sq_empty condvar to wake up the master waiting in produce_socket() + while (consume_socket(ctx, &conn->client)) { + conn->birth_time = time(NULL); + conn->ctx = ctx; + + // Fill in IP, port info early so even if SSL setup below fails, + // error handler would have the corresponding info. + // Thanks to Johannes Winkelmann for the patch. + // TODO(lsm): Fix IPv6 case + conn->request_info.remote_port = ntohs(conn->client.rsa.sin.sin_port); + memcpy(&conn->request_info.remote_ip, + &conn->client.rsa.sin.sin_addr.s_addr, 4); + conn->request_info.remote_ip = ntohl(conn->request_info.remote_ip); + conn->request_info.is_ssl = conn->client.is_ssl; + + if (!conn->client.is_ssl || + (conn->client.is_ssl && + sslize(conn, conn->ctx->ssl_ctx, SSL_accept))) { + process_new_connection(conn); + } + + close_connection(conn); + } + free(conn); + } + + // Signal master that we're done with connection and exiting + (void) pthread_mutex_lock(&ctx->mutex); + ctx->num_threads--; + (void) pthread_cond_signal(&ctx->cond); + assert(ctx->num_threads >= 0); + (void) pthread_mutex_unlock(&ctx->mutex); + + DEBUG_TRACE(("exiting")); +} + +// Master thread adds accepted socket to a queue +static void produce_socket(struct mg_context *ctx, const struct socket *sp) { + (void) pthread_mutex_lock(&ctx->mutex); + + // If the queue is full, wait + while (ctx->stop_flag == 0 && + ctx->sq_head - ctx->sq_tail >= (int) ARRAY_SIZE(ctx->queue)) { + (void) pthread_cond_wait(&ctx->sq_empty, &ctx->mutex); + } + + if (ctx->sq_head - ctx->sq_tail < (int) ARRAY_SIZE(ctx->queue)) { + // Copy socket to the queue and increment head + ctx->queue[ctx->sq_head % ARRAY_SIZE(ctx->queue)] = *sp; + ctx->sq_head++; + DEBUG_TRACE(("queued socket %d", sp->sock)); + } + + (void) pthread_cond_signal(&ctx->sq_full); + (void) pthread_mutex_unlock(&ctx->mutex); +} + +static void accept_new_connection(const struct socket *listener, + struct mg_context *ctx) { + struct socket accepted; + char src_addr[20]; + socklen_t len; + int allowed; + + len = sizeof(accepted.rsa); + accepted.lsa = listener->lsa; + accepted.sock = accept(listener->sock, &accepted.rsa.sa, &len); + if (accepted.sock != INVALID_SOCKET) { + allowed = check_acl(ctx, ntohl(* (uint32_t *) &accepted.rsa.sin.sin_addr)); + if (allowed) { + // Put accepted socket structure into the queue + DEBUG_TRACE(("accepted socket %d", accepted.sock)); + accepted.is_ssl = listener->is_ssl; + produce_socket(ctx, &accepted); + } else { + sockaddr_to_string(src_addr, sizeof(src_addr), &accepted.rsa); + cry(fc(ctx), "%s: %s is not allowed to connect", __func__, src_addr); + (void) closesocket(accepted.sock); + } + } +} + +static void master_thread(struct mg_context *ctx) { + fd_set read_set; + struct timeval tv; + struct socket *sp; + int max_fd; + + // Increase priority of the master thread +#if defined(_WIN32) + SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_ABOVE_NORMAL); +#endif + +#if defined(ISSUE_317) + struct sched_param sched_param; + sched_param.sched_priority = sched_get_priority_max(SCHED_RR); + pthread_setschedparam(pthread_self(), SCHED_RR, &sched_param); +#endif + + while (ctx->stop_flag == 0) { + FD_ZERO(&read_set); + max_fd = -1; + + // Add listening sockets to the read set + for (sp = ctx->listening_sockets; sp != NULL; sp = sp->next) { + add_to_set(sp->sock, &read_set, &max_fd); + } + + tv.tv_sec = 0; + tv.tv_usec = 200 * 1000; + + if (select(max_fd + 1, &read_set, NULL, NULL, &tv) < 0) { +#ifdef _WIN32 + // On windows, if read_set and write_set are empty, + // select() returns "Invalid parameter" error + // (at least on my Windows XP Pro). So in this case, we sleep here. + mg_sleep(1000); +#endif // _WIN32 + } else { + for (sp = ctx->listening_sockets; sp != NULL; sp = sp->next) { + if (ctx->stop_flag == 0 && FD_ISSET(sp->sock, &read_set)) { + accept_new_connection(sp, ctx); + } + } + } + } + DEBUG_TRACE(("stopping workers")); + + // Stop signal received: somebody called mg_stop. Quit. + close_all_listening_sockets(ctx); + + // Wakeup workers that are waiting for connections to handle. + pthread_cond_broadcast(&ctx->sq_full); + + // Wait until all threads finish + (void) pthread_mutex_lock(&ctx->mutex); + while (ctx->num_threads > 0) { + (void) pthread_cond_wait(&ctx->cond, &ctx->mutex); + } + (void) pthread_mutex_unlock(&ctx->mutex); + + // All threads exited, no sync is needed. Destroy mutex and condvars + (void) pthread_mutex_destroy(&ctx->mutex); + (void) pthread_cond_destroy(&ctx->cond); + (void) pthread_cond_destroy(&ctx->sq_empty); + (void) pthread_cond_destroy(&ctx->sq_full); + +#if !defined(NO_SSL) + uninitialize_ssl(ctx); +#endif + DEBUG_TRACE(("exiting")); + + // Signal mg_stop() that we're done. + // WARNING: This must be the very last thing this + // thread does, as ctx becomes invalid after this line. + ctx->stop_flag = 2; +} + +static void free_context(struct mg_context *ctx) { + int i; + + // Deallocate config parameters + for (i = 0; i < NUM_OPTIONS; i++) { + if (ctx->config[i] != NULL) + free(ctx->config[i]); + } + + // Deallocate SSL context + if (ctx->ssl_ctx != NULL) { + SSL_CTX_free(ctx->ssl_ctx); + } + if (ctx->client_ssl_ctx != NULL) { + SSL_CTX_free(ctx->client_ssl_ctx); + } +#ifndef NO_SSL + if (ssl_mutexes != NULL) { + free(ssl_mutexes); + ssl_mutexes = NULL; + } +#endif // !NO_SSL + + // Deallocate context itself + free(ctx); +} + +void mg_stop(struct mg_context *ctx) { + ctx->stop_flag = 1; + + // Wait until mg_fini() stops + while (ctx->stop_flag != 2) { + (void) mg_sleep(10); + } + free_context(ctx); + +#if defined(_WIN32) && !defined(__SYMBIAN32__) + (void) WSACleanup(); +#endif // _WIN32 +} + +struct mg_context *mg_start(mg_callback_t user_callback, void *user_data, + const char **options) { + struct mg_context *ctx; + const char *name, *value, *default_value; + int i; + +#if defined(_WIN32) && !defined(__SYMBIAN32__) + WSADATA data; + WSAStartup(MAKEWORD(2,2), &data); + InitializeCriticalSection(&global_log_file_lock); +#endif // _WIN32 + + // Allocate context and initialize reasonable general case defaults. + // TODO(lsm): do proper error handling here. + if ((ctx = (struct mg_context *) calloc(1, sizeof(*ctx))) == NULL) { + return NULL; + } + ctx->user_callback = user_callback; + ctx->user_data = user_data; + + while (options && (name = *options++) != NULL) { + if ((i = get_option_index(name)) == -1) { + cry(fc(ctx), "Invalid option: %s", name); + free_context(ctx); + return NULL; + } else if ((value = *options++) == NULL) { + cry(fc(ctx), "%s: option value cannot be NULL", name); + free_context(ctx); + return NULL; + } + if (ctx->config[i] != NULL) { + cry(fc(ctx), "warning: %s: duplicate option", name); + } + ctx->config[i] = mg_strdup(value); + DEBUG_TRACE(("[%s] -> [%s]", name, value)); + } + + // Set default value if needed + for (i = 0; config_options[i * ENTRIES_PER_CONFIG_OPTION] != NULL; i++) { + default_value = config_options[i * ENTRIES_PER_CONFIG_OPTION + 2]; + if (ctx->config[i] == NULL && default_value != NULL) { + ctx->config[i] = mg_strdup(default_value); + DEBUG_TRACE(("Setting default: [%s] -> [%s]", + config_options[i * ENTRIES_PER_CONFIG_OPTION + 1], + default_value)); + } + } + + // NOTE(lsm): order is important here. SSL certificates must + // be initialized before listening ports. UID must be set last. + if (!set_gpass_option(ctx) || +#if !defined(NO_SSL) + !set_ssl_option(ctx) || +#endif + !set_ports_option(ctx) || +#if !defined(_WIN32) + !set_uid_option(ctx) || +#endif + !set_acl_option(ctx)) { + free_context(ctx); + return NULL; + } + +#if !defined(_WIN32) && !defined(__SYMBIAN32__) + // Ignore SIGPIPE signal, so if browser cancels the request, it + // won't kill the whole process. + (void) signal(SIGPIPE, SIG_IGN); + // Also ignoring SIGCHLD to let the OS to reap zombies properly. + (void) signal(SIGCHLD, SIG_IGN); +#endif // !_WIN32 + + (void) pthread_mutex_init(&ctx->mutex, NULL); + (void) pthread_cond_init(&ctx->cond, NULL); + (void) pthread_cond_init(&ctx->sq_empty, NULL); + (void) pthread_cond_init(&ctx->sq_full, NULL); + + // Start master (listening) thread + mg_start_thread((mg_thread_func_t) master_thread, ctx); + + // Start worker threads + for (i = 0; i < atoi(ctx->config[NUM_THREADS]); i++) { + if (mg_start_thread((mg_thread_func_t) worker_thread, ctx) != 0) { + cry(fc(ctx), "Cannot start worker thread: %d", ERRNO); + } else { + ctx->num_threads++; + } + } + + return ctx; +} |