From 349cfa7acb95abe865209a28e417ec74b56f9bba Mon Sep 17 00:00:00 2001 From: Alberto Gonzalez Iniesta Date: Tue, 21 Feb 2012 15:53:40 +0100 Subject: Imported Upstream version 2.2.1 --- buffer.h | 864 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 864 insertions(+) create mode 100644 buffer.h (limited to 'buffer.h') diff --git a/buffer.h b/buffer.h new file mode 100644 index 0000000..3b24d09 --- /dev/null +++ b/buffer.h @@ -0,0 +1,864 @@ +/* + * OpenVPN -- An application to securely tunnel IP networks + * over a single UDP port, with support for SSL/TLS-based + * session authentication and key exchange, + * packet encryption, packet authentication, and + * packet compression. + * + * Copyright (C) 2002-2010 OpenVPN Technologies, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program (see the file COPYING included with this + * distribution); if not, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef BUFFER_H +#define BUFFER_H + +#include "basic.h" + +#define BUF_SIZE_MAX 1000000 + +/* + * Define verify_align function, otherwise + * it will be a noop. + */ +/* #define VERIFY_ALIGNMENT */ + +/* + * Keep track of source file/line of buf_init calls + */ +#ifdef VERIFY_ALIGNMENT +#define BUF_INIT_TRACKING +#endif + +/* basic buffer class for OpenVPN */ + +struct buffer +{ + int capacity; /* size of buffer allocated by malloc */ + int offset; /* data starts at data + offset, offset > 0 to allow for efficient prepending */ + int len; /* length of data that starts at data + offset */ + uint8_t *data; + +#ifdef BUF_INIT_TRACKING + const char *debug_file; + int debug_line; +#endif +}; + +/* for garbage collection */ + +struct gc_entry +{ + struct gc_entry *next; +}; + +struct gc_arena +{ + struct gc_entry *list; +}; + +#define BPTR(buf) (buf_bptr(buf)) +#define BEND(buf) (buf_bend(buf)) +#define BLAST(buf) (buf_blast(buf)) +#define BLEN(buf) (buf_len(buf)) +#define BDEF(buf) (buf_defined(buf)) +#define BSTR(buf) (buf_str(buf)) +#define BCAP(buf) (buf_forward_capacity (buf)) + +void buf_clear (struct buffer *buf); + +struct buffer clear_buf (void); +void free_buf (struct buffer *buf); + +bool buf_assign (struct buffer *dest, const struct buffer *src); + +void string_clear (char *str); +int string_array_len (const char **array); + +size_t array_mult_safe (const size_t m1, const size_t m2, const size_t extra); + +#define PA_BRACKET (1<<0) +char *print_argv (const char **p, struct gc_arena *gc, const unsigned int flags); + +void buf_size_error (const size_t size); + +/* for dmalloc debugging */ + +#ifdef DMALLOC + +#define alloc_buf(size) alloc_buf_debug (size, __FILE__, __LINE__) +#define alloc_buf_gc(size, gc) alloc_buf_gc_debug (size, gc, __FILE__, __LINE__); +#define clone_buf(buf) clone_buf_debug (buf, __FILE__, __LINE__); +#define gc_malloc(size, clear, arena) gc_malloc_debug (size, clear, arena, __FILE__, __LINE__) +#define string_alloc(str, gc) string_alloc_debug (str, gc, __FILE__, __LINE__) +#define string_alloc_buf(str, gc) string_alloc_buf_debug (str, gc, __FILE__, __LINE__) + +struct buffer alloc_buf_debug (size_t size, const char *file, int line); +struct buffer alloc_buf_gc_debug (size_t size, struct gc_arena *gc, const char *file, int line); +struct buffer clone_buf_debug (const struct buffer* buf, const char *file, int line); +void *gc_malloc_debug (size_t size, bool clear, struct gc_arena *a, const char *file, int line); +char *string_alloc_debug (const char *str, struct gc_arena *gc, const char *file, int line); +struct buffer string_alloc_buf_debug (const char *str, struct gc_arena *gc, const char *file, int line); + +#else + +struct buffer alloc_buf (size_t size); +struct buffer alloc_buf_gc (size_t size, struct gc_arena *gc); /* allocate buffer with garbage collection */ +struct buffer clone_buf (const struct buffer* buf); +void *gc_malloc (size_t size, bool clear, struct gc_arena *a); +char *string_alloc (const char *str, struct gc_arena *gc); +struct buffer string_alloc_buf (const char *str, struct gc_arena *gc); + +#endif + +#ifdef BUF_INIT_TRACKING +#define buf_init(buf, offset) buf_init_debug (buf, offset, __FILE__, __LINE__) +bool buf_init_debug (struct buffer *buf, int offset, const char *file, int line); +#else +#define buf_init(buf, offset) buf_init_dowork (buf, offset) +#endif + + +/* inline functions */ + +static inline bool +buf_defined (const struct buffer *buf) +{ + return buf->data != NULL; +} + +static inline bool +buf_valid (const struct buffer *buf) +{ + return likely (buf->data != NULL) && likely (buf->len >= 0); +} + +static inline uint8_t * +buf_bptr (const struct buffer *buf) +{ + if (buf_valid (buf)) + return buf->data + buf->offset; + else + return NULL; +} + +static int +buf_len (const struct buffer *buf) +{ + if (buf_valid (buf)) + return buf->len; + else + return 0; +} + +static inline uint8_t * +buf_bend (const struct buffer *buf) +{ + return buf_bptr (buf) + buf_len (buf); +} + +static inline uint8_t * +buf_blast (const struct buffer *buf) +{ + if (buf_len (buf) > 0) + return buf_bptr (buf) + buf_len (buf) - 1; + else + return NULL; +} + +static inline bool +buf_size_valid (const size_t size) +{ + return likely (size < BUF_SIZE_MAX); +} + +static inline bool +buf_size_valid_signed (const int size) +{ + return likely (size >= -BUF_SIZE_MAX) && likely (size < BUF_SIZE_MAX); +} + +static inline char * +buf_str (const struct buffer *buf) +{ + return (char *)buf_bptr(buf); +} + +static inline void +buf_reset (struct buffer *buf) +{ + buf->capacity = 0; + buf->offset = 0; + buf->len = 0; + buf->data = NULL; +} + +static inline void +buf_reset_len (struct buffer *buf) +{ + buf->len = 0; + buf->offset = 0; +} + +static inline bool +buf_init_dowork (struct buffer *buf, int offset) +{ + if (offset < 0 || offset > buf->capacity || buf->data == NULL) + return false; + buf->len = 0; + buf->offset = offset; + return true; +} + +static inline void +buf_set_write (struct buffer *buf, uint8_t *data, int size) +{ + if (!buf_size_valid (size)) + buf_size_error (size); + buf->len = 0; + buf->offset = 0; + buf->capacity = size; + buf->data = data; + if (size > 0 && data) + *data = 0; +} + +static inline void +buf_set_read (struct buffer *buf, const uint8_t *data, int size) +{ + if (!buf_size_valid (size)) + buf_size_error (size); + buf->len = buf->capacity = size; + buf->offset = 0; + buf->data = (uint8_t *)data; +} + +/* Like strncpy but makes sure dest is always null terminated */ +static inline void +strncpynt (char *dest, const char *src, size_t maxlen) +{ + strncpy (dest, src, maxlen); + if (maxlen > 0) + dest[maxlen - 1] = 0; +} + +/* return true if string contains at least one numerical digit */ +static inline bool +has_digit (const unsigned char* src) +{ + unsigned char c; + while ((c = *src++)) + { + if (isdigit(c)) + return true; + } + return false; +} + +/* + * printf append to a buffer with overflow check + */ +bool buf_printf (struct buffer *buf, const char *format, ...) +#ifdef __GNUC__ + __attribute__ ((format (printf, 2, 3))) +#endif + ; + +/* + * Like snprintf but guarantees null termination for size > 0 + */ +int openvpn_snprintf(char *str, size_t size, const char *format, ...) +#ifdef __GNUC__ + __attribute__ ((format (printf, 3, 4))) +#endif + ; + +/* + * remove/add trailing characters + */ + +void buf_null_terminate (struct buffer *buf); +void buf_chomp (struct buffer *buf); +void buf_rmtail (struct buffer *buf, uint8_t remove); + +/* + * non-buffer string functions + */ +void chomp (char *str); +void rm_trailing_chars (char *str, const char *what_to_delete); +const char *skip_leading_whitespace (const char *str); +void string_null_terminate (char *str, int len, int capacity); + +/* + * Write string in buf to file descriptor fd. + * NOTE: requires that string be null terminated. + */ +void buf_write_string_file (const struct buffer *buf, const char *filename, int fd); + +/* + * write a string to the end of a buffer that was + * truncated by buf_printf + */ +void buf_catrunc (struct buffer *buf, const char *str); + +/* + * convert a multi-line output to one line + */ +void convert_to_one_line (struct buffer *buf); + +/* + * Parse a string based on a given delimiter char + */ +bool buf_parse (struct buffer *buf, const int delim, char *line, const int size); + +/* + * Hex dump -- Output a binary buffer to a hex string and return it. + */ +char * +format_hex_ex (const uint8_t *data, int size, int maxoutput, + int space_break, const char* separator, + struct gc_arena *gc); + +static inline char * +format_hex (const uint8_t *data, int size, int maxoutput, struct gc_arena *gc) +{ + return format_hex_ex (data, size, maxoutput, 4, " ", gc); +} + +/* + * Return a buffer that is a subset of another buffer. + */ +struct buffer buf_sub (struct buffer *buf, int size, bool prepend); + +/* + * Check if sufficient space to append to buffer. + */ + +static inline bool +buf_safe (const struct buffer *buf, int len) +{ + return buf_valid (buf) && buf_size_valid (len) + && buf->offset + buf->len + len <= buf->capacity; +} + +static inline bool +buf_safe_bidir (const struct buffer *buf, int len) +{ + if (buf_valid (buf) && buf_size_valid_signed (len)) + { + const int newlen = buf->len + len; + return newlen >= 0 && buf->offset + newlen <= buf->capacity; + } + else + return false; +} + +static inline int +buf_forward_capacity (const struct buffer *buf) +{ + if (buf_valid (buf)) + { + int ret = buf->capacity - (buf->offset + buf->len); + if (ret < 0) + ret = 0; + return ret; + } + else + return 0; +} + +static inline int +buf_forward_capacity_total (const struct buffer *buf) +{ + if (buf_valid (buf)) + { + int ret = buf->capacity - buf->offset; + if (ret < 0) + ret = 0; + return ret; + } + else + return 0; +} + +static inline int +buf_reverse_capacity (const struct buffer *buf) +{ + if (buf_valid (buf)) + return buf->offset; + else + return 0; +} + +static inline bool +buf_inc_len (struct buffer *buf, int inc) +{ + if (!buf_safe_bidir (buf, inc)) + return false; + buf->len += inc; + return true; +} + +/* + * Make space to prepend to a buffer. + * Return NULL if no space. + */ + +static inline uint8_t * +buf_prepend (struct buffer *buf, int size) +{ + if (!buf_valid (buf) || size < 0 || size > buf->offset) + return NULL; + buf->offset -= size; + buf->len += size; + return BPTR (buf); +} + +static inline bool +buf_advance (struct buffer *buf, int size) +{ + if (!buf_valid (buf) || size < 0 || buf->len < size) + return false; + buf->offset += size; + buf->len -= size; + return true; +} + +/* + * Return a pointer to allocated space inside a buffer. + * Return NULL if no space. + */ + +static inline uint8_t * +buf_write_alloc (struct buffer *buf, int size) +{ + uint8_t *ret; + if (!buf_safe (buf, size)) + return NULL; + ret = BPTR (buf) + buf->len; + buf->len += size; + return ret; +} + +static inline uint8_t * +buf_write_alloc_prepend (struct buffer *buf, int size, bool prepend) +{ + return prepend ? buf_prepend (buf, size) : buf_write_alloc (buf, size); +} + +static inline uint8_t * +buf_read_alloc (struct buffer *buf, int size) +{ + uint8_t *ret; + if (size < 0 || buf->len < size) + return NULL; + ret = BPTR (buf); + buf->offset += size; + buf->len -= size; + return ret; +} + +static inline bool +buf_write (struct buffer *dest, const void *src, int size) +{ + uint8_t *cp = buf_write_alloc (dest, size); + if (!cp) + return false; + memcpy (cp, src, size); + return true; +} + +static inline bool +buf_write_prepend (struct buffer *dest, const void *src, int size) +{ + uint8_t *cp = buf_prepend (dest, size); + if (!cp) + return false; + memcpy (cp, src, size); + return true; +} + +static inline bool +buf_write_u8 (struct buffer *dest, int data) +{ + uint8_t u8 = (uint8_t) data; + return buf_write (dest, &u8, sizeof (uint8_t)); +} + +static inline bool +buf_write_u16 (struct buffer *dest, int data) +{ + uint16_t u16 = htons ((uint16_t) data); + return buf_write (dest, &u16, sizeof (uint16_t)); +} + +static inline bool +buf_write_u32 (struct buffer *dest, int data) +{ + uint32_t u32 = htonl ((uint32_t) data); + return buf_write (dest, &u32, sizeof (uint32_t)); +} + +static inline bool +buf_copy (struct buffer *dest, const struct buffer *src) +{ + return buf_write (dest, BPTR (src), BLEN (src)); +} + +static inline bool +buf_copy_n (struct buffer *dest, struct buffer *src, int n) +{ + uint8_t *cp = buf_read_alloc (src, n); + if (!cp) + return false; + return buf_write (dest, cp, n); +} + +static inline bool +buf_copy_range (struct buffer *dest, + int dest_index, + const struct buffer *src, + int src_index, + int src_len) +{ + if (src_index < 0 + || src_len < 0 + || src_index + src_len > src->len + || dest_index < 0 + || dest->offset + dest_index + src_len > dest->capacity) + return false; + memcpy (dest->data + dest->offset + dest_index, src->data + src->offset + src_index, src_len); + if (dest_index + src_len > dest->len) + dest->len = dest_index + src_len; + return true; +} + +/* truncate src to len, copy excess data beyond len to dest */ +static inline bool +buf_copy_excess (struct buffer *dest, + struct buffer *src, + int len) +{ + if (len < 0) + return false; + if (src->len > len) + { + struct buffer b = *src; + src->len = len; + if (!buf_advance (&b, len)) + return false; + return buf_copy (dest, &b); + } + else + { + return true; + } +} + +static inline bool +buf_read (struct buffer *src, void *dest, int size) +{ + uint8_t *cp = buf_read_alloc (src, size); + if (!cp) + return false; + memcpy (dest, cp, size); + return true; +} + +static inline int +buf_read_u8 (struct buffer *buf) +{ + int ret; + if (BLEN (buf) < 1) + return -1; + ret = *BPTR(buf); + buf_advance (buf, 1); + return ret; +} + +static inline int +buf_read_u16 (struct buffer *buf) +{ + uint16_t ret; + if (!buf_read (buf, &ret, sizeof (uint16_t))) + return -1; + return ntohs (ret); +} + +static inline uint32_t +buf_read_u32 (struct buffer *buf, bool *good) +{ + uint32_t ret; + if (!buf_read (buf, &ret, sizeof (uint32_t))) + { + if (good) + *good = false; + return 0; + } + else + { + if (good) + *good = true; + return ntohl (ret); + } +} + +static inline bool +buf_string_match (const struct buffer *src, const void *match, int size) +{ + if (size != src->len) + return false; + return memcmp (BPTR (src), match, size) == 0; +} + +static inline bool +buf_string_match_head (const struct buffer *src, const void *match, int size) +{ + if (size < 0 || size > src->len) + return false; + return memcmp (BPTR (src), match, size) == 0; +} + +bool buf_string_match_head_str (const struct buffer *src, const char *match); +bool buf_string_compare_advance (struct buffer *src, const char *match); +int buf_substring_len (const struct buffer *buf, int delim); + +/* + * Bitwise operations + */ +static inline void +xor (uint8_t *dest, const uint8_t *src, int len) +{ + while (len-- > 0) + *dest++ ^= *src++; +} + +/* + * Print a string which might be NULL + */ +const char *np (const char *str); + +/*#define CHARACTER_CLASS_DEBUG*/ + +/* character classes */ + +#define CC_ANY (1<<0) +#define CC_NULL (1<<1) + +#define CC_ALNUM (1<<2) +#define CC_ALPHA (1<<3) +#define CC_ASCII (1<<4) +#define CC_CNTRL (1<<5) +#define CC_DIGIT (1<<6) +#define CC_PRINT (1<<7) +#define CC_PUNCT (1<<8) +#define CC_SPACE (1<<9) +#define CC_XDIGIT (1<<10) + +#define CC_BLANK (1<<11) +#define CC_NEWLINE (1<<12) +#define CC_CR (1<<13) + +#define CC_BACKSLASH (1<<14) +#define CC_UNDERBAR (1<<15) +#define CC_DASH (1<<16) +#define CC_DOT (1<<17) +#define CC_COMMA (1<<18) +#define CC_COLON (1<<19) +#define CC_SLASH (1<<20) +#define CC_SINGLE_QUOTE (1<<21) +#define CC_DOUBLE_QUOTE (1<<22) +#define CC_REVERSE_QUOTE (1<<23) +#define CC_AT (1<<24) +#define CC_EQUAL (1<<25) + +/* macro classes */ +#define CC_NAME (CC_ALNUM|CC_UNDERBAR) +#define CC_CRLF (CC_CR|CC_NEWLINE) + +bool char_class (const unsigned char c, const unsigned int flags); +bool string_class (const char *str, const unsigned int inclusive, const unsigned int exclusive); +bool string_mod (char *str, const unsigned int inclusive, const unsigned int exclusive, const char replace); + +const char *string_mod_const (const char *str, + const unsigned int inclusive, + const unsigned int exclusive, + const char replace, + struct gc_arena *gc); + +void string_replace_leading (char *str, const char match, const char replace); + +#ifdef CHARACTER_CLASS_DEBUG +void character_class_debug (void); +#endif + +/* + * Verify that a pointer is correctly aligned + */ +#ifdef VERIFY_ALIGNMENT + void valign4 (const struct buffer *buf, const char *file, const int line); +# define verify_align_4(ptr) valign4(buf, __FILE__, __LINE__) +#else +# define verify_align_4(ptr) +#endif + +/* + * Very basic garbage collection, mostly for routines that return + * char ptrs to malloced strings. + */ + +void gc_transfer (struct gc_arena *dest, struct gc_arena *src); + +void x_gc_free (struct gc_arena *a); + +static inline bool +gc_defined (struct gc_arena *a) +{ + return a->list != NULL; +} + +static inline void +gc_init (struct gc_arena *a) +{ + a->list = NULL; +} + +static inline void +gc_detach (struct gc_arena *a) +{ + gc_init (a); +} + +static inline struct gc_arena +gc_new (void) +{ + struct gc_arena ret; + ret.list = NULL; + return ret; +} + +static inline void +gc_free (struct gc_arena *a) +{ + if (a->list) + x_gc_free (a); +} + +static inline void +gc_reset (struct gc_arena *a) +{ + gc_free (a); +} + +/* + * Allocate memory to hold a structure + */ + +void out_of_memory (void); + +#define ALLOC_OBJ(dptr, type) \ +{ \ + check_malloc_return ((dptr) = (type *) malloc (sizeof (type))); \ +} + +#define ALLOC_OBJ_CLEAR(dptr, type) \ +{ \ + ALLOC_OBJ (dptr, type); \ + memset ((dptr), 0, sizeof(type)); \ +} + +#define ALLOC_ARRAY(dptr, type, n) \ +{ \ + check_malloc_return ((dptr) = (type *) malloc (array_mult_safe (sizeof (type), (n), 0))); \ +} + +#define ALLOC_ARRAY_GC(dptr, type, n, gc) \ +{ \ + (dptr) = (type *) gc_malloc (array_mult_safe (sizeof (type), (n), 0), false, (gc)); \ +} + +#define ALLOC_ARRAY_CLEAR(dptr, type, n) \ +{ \ + ALLOC_ARRAY (dptr, type, n); \ + memset ((dptr), 0, (array_mult_safe (sizeof(type), (n), 0))); \ +} + +#define ALLOC_ARRAY_CLEAR_GC(dptr, type, n, gc) \ +{ \ + (dptr) = (type *) gc_malloc (array_mult_safe (sizeof (type), (n), 0), true, (gc)); \ +} + +#define ALLOC_VAR_ARRAY_CLEAR_GC(dptr, type, atype, n, gc) \ +{ \ + (dptr) = (type *) gc_malloc (array_mult_safe (sizeof (atype), (n), sizeof (type)), true, (gc)); \ +} + +#define ALLOC_OBJ_GC(dptr, type, gc) \ +{ \ + (dptr) = (type *) gc_malloc (sizeof (type), false, (gc)); \ +} + +#define ALLOC_OBJ_CLEAR_GC(dptr, type, gc) \ +{ \ + (dptr) = (type *) gc_malloc (sizeof (type), true, (gc)); \ +} + +static inline void +check_malloc_return (void *p) +{ + void out_of_memory (void); + if (!p) + out_of_memory (); +} + +/* + * Manage lists of buffers + */ + +#ifdef ENABLE_BUFFER_LIST + +struct buffer_entry +{ + struct buffer buf; + struct buffer_entry *next; +}; + +struct buffer_list +{ + struct buffer_entry *head; /* next item to pop/peek */ + struct buffer_entry *tail; /* last item pushed */ + int size; /* current number of entries */ + int max_size; /* maximum size list should grow to */ +}; + +struct buffer_list *buffer_list_new (const int max_size); +void buffer_list_free (struct buffer_list *ol); + +bool buffer_list_defined (const struct buffer_list *ol); +void buffer_list_reset (struct buffer_list *ol); + +void buffer_list_push (struct buffer_list *ol, const unsigned char *str); +struct buffer_entry *buffer_list_push_data (struct buffer_list *ol, const uint8_t *data, size_t size); +struct buffer *buffer_list_peek (struct buffer_list *ol); +void buffer_list_advance (struct buffer_list *ol, int n); +void buffer_list_pop (struct buffer_list *ol); + +void buffer_list_aggregate (struct buffer_list *bl, const size_t max); + +struct buffer_list *buffer_list_file (const char *fn, int max_line_len); + +#endif + +#endif /* BUFFER_H */ -- cgit v1.2.3