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-rw-r--r--src/openvpn/forward.c1551
1 files changed, 1551 insertions, 0 deletions
diff --git a/src/openvpn/forward.c b/src/openvpn/forward.c
new file mode 100644
index 0000000..57c7846
--- /dev/null
+++ b/src/openvpn/forward.c
@@ -0,0 +1,1551 @@
+/*
+ * OpenVPN -- An application to securely tunnel IP networks
+ * over a single TCP/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. <sales@openvpn.net>
+ *
+ * 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
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#elif defined(_MSC_VER)
+#include "config-msvc.h"
+#endif
+
+#include "syshead.h"
+
+#include "forward.h"
+#include "init.h"
+#include "push.h"
+#include "gremlin.h"
+#include "mss.h"
+#include "event.h"
+#include "ps.h"
+#include "dhcp.h"
+#include "common.h"
+
+#include "memdbg.h"
+
+#include "forward-inline.h"
+#include "occ-inline.h"
+#include "ping-inline.h"
+#include "mstats.h"
+
+counter_type link_read_bytes_global; /* GLOBAL */
+counter_type link_write_bytes_global; /* GLOBAL */
+
+/* show event wait debugging info */
+
+#ifdef ENABLE_DEBUG
+
+const char *
+wait_status_string (struct context *c, struct gc_arena *gc)
+{
+ struct buffer out = alloc_buf_gc (64, gc);
+ buf_printf (&out, "I/O WAIT %s|%s|%s|%s %s",
+ tun_stat (c->c1.tuntap, EVENT_READ, gc),
+ tun_stat (c->c1.tuntap, EVENT_WRITE, gc),
+ socket_stat (c->c2.link_socket, EVENT_READ, gc),
+ socket_stat (c->c2.link_socket, EVENT_WRITE, gc),
+ tv_string (&c->c2.timeval, gc));
+ return BSTR (&out);
+}
+
+void
+show_wait_status (struct context *c)
+{
+ struct gc_arena gc = gc_new ();
+ dmsg (D_EVENT_WAIT, "%s", wait_status_string (c, &gc));
+ gc_free (&gc);
+}
+
+#endif
+
+/*
+ * In TLS mode, let TLS level respond to any control-channel
+ * packets which were received, or prepare any packets for
+ * transmission.
+ *
+ * tmp_int is purely an optimization that allows us to call
+ * tls_multi_process less frequently when there's not much
+ * traffic on the control-channel.
+ *
+ */
+#if defined(ENABLE_CRYPTO) && defined(ENABLE_SSL)
+void
+check_tls_dowork (struct context *c)
+{
+ interval_t wakeup = BIG_TIMEOUT;
+
+ if (interval_test (&c->c2.tmp_int))
+ {
+ const int tmp_status = tls_multi_process
+ (c->c2.tls_multi, &c->c2.to_link, &c->c2.to_link_addr,
+ get_link_socket_info (c), &wakeup);
+ if (tmp_status == TLSMP_ACTIVE)
+ {
+ update_time ();
+ interval_action (&c->c2.tmp_int);
+ }
+ else if (tmp_status == TLSMP_KILL)
+ {
+ register_signal (c, SIGTERM, "auth-control-exit");
+ }
+
+ interval_future_trigger (&c->c2.tmp_int, wakeup);
+ }
+
+ interval_schedule_wakeup (&c->c2.tmp_int, &wakeup);
+
+ if (wakeup)
+ context_reschedule_sec (c, wakeup);
+}
+#endif
+
+#if defined(ENABLE_CRYPTO) && defined(ENABLE_SSL)
+
+void
+check_tls_errors_co (struct context *c)
+{
+ msg (D_STREAM_ERRORS, "Fatal TLS error (check_tls_errors_co), restarting");
+ register_signal (c, c->c2.tls_exit_signal, "tls-error"); /* SOFT-SIGUSR1 -- TLS error */
+}
+
+void
+check_tls_errors_nco (struct context *c)
+{
+ register_signal (c, c->c2.tls_exit_signal, "tls-error"); /* SOFT-SIGUSR1 -- TLS error */
+}
+
+#endif
+
+#if P2MP
+
+/*
+ * Handle incoming configuration
+ * messages on the control channel.
+ */
+void
+check_incoming_control_channel_dowork (struct context *c)
+{
+ const int len = tls_test_payload_len (c->c2.tls_multi);
+ if (len)
+ {
+ struct gc_arena gc = gc_new ();
+ struct buffer buf = alloc_buf_gc (len, &gc);
+ if (tls_rec_payload (c->c2.tls_multi, &buf))
+ {
+ /* force null termination of message */
+ buf_null_terminate (&buf);
+
+ /* enforce character class restrictions */
+ string_mod (BSTR (&buf), CC_PRINT, CC_CRLF, 0);
+
+ if (buf_string_match_head_str (&buf, "AUTH_FAILED"))
+ receive_auth_failed (c, &buf);
+ else if (buf_string_match_head_str (&buf, "PUSH_"))
+ incoming_push_message (c, &buf);
+ else if (buf_string_match_head_str (&buf, "RESTART"))
+ server_pushed_signal (c, &buf, true, 7);
+ else if (buf_string_match_head_str (&buf, "HALT"))
+ server_pushed_signal (c, &buf, false, 4);
+ else
+ msg (D_PUSH_ERRORS, "WARNING: Received unknown control message: %s", BSTR (&buf));
+ }
+ else
+ {
+ msg (D_PUSH_ERRORS, "WARNING: Receive control message failed");
+ }
+
+ gc_free (&gc);
+ }
+}
+
+/*
+ * Periodically resend PUSH_REQUEST until PUSH message received
+ */
+void
+check_push_request_dowork (struct context *c)
+{
+ send_push_request (c);
+
+ /* if no response to first push_request, retry at PUSH_REQUEST_INTERVAL second intervals */
+ event_timeout_modify_wakeup (&c->c2.push_request_interval, PUSH_REQUEST_INTERVAL);
+}
+
+#endif /* P2MP */
+
+/*
+ * Things that need to happen immediately after connection initiation should go here.
+ */
+void
+check_connection_established_dowork (struct context *c)
+{
+ if (event_timeout_trigger (&c->c2.wait_for_connect, &c->c2.timeval, ETT_DEFAULT))
+ {
+ if (CONNECTION_ESTABLISHED (c))
+ {
+#if P2MP
+ /* if --pull was specified, send a push request to server */
+ if (c->c2.tls_multi && c->options.pull)
+ {
+#ifdef ENABLE_MANAGEMENT
+ if (management)
+ {
+ management_set_state (management,
+ OPENVPN_STATE_GET_CONFIG,
+ NULL,
+ 0,
+ 0);
+ }
+#endif
+ /* send push request in 1 sec */
+ event_timeout_init (&c->c2.push_request_interval, 1, now);
+ reset_coarse_timers (c);
+ }
+ else
+#endif
+ {
+ do_up (c, false, 0);
+ }
+
+ event_timeout_clear (&c->c2.wait_for_connect);
+ }
+ }
+}
+
+/*
+ * Send a string to remote over the TLS control channel.
+ * Used for push/pull messages, passing username/password,
+ * etc.
+ */
+bool
+send_control_channel_string (struct context *c, const char *str, int msglevel)
+{
+#if defined(ENABLE_CRYPTO) && defined(ENABLE_SSL)
+ if (c->c2.tls_multi) {
+ struct gc_arena gc = gc_new ();
+ bool stat;
+
+ /* buffered cleartext write onto TLS control channel */
+ stat = tls_send_payload (c->c2.tls_multi, (uint8_t*) str, strlen (str) + 1);
+
+ /*
+ * Reschedule tls_multi_process.
+ * NOTE: in multi-client mode, usually the below two statements are
+ * insufficient to reschedule the client instance object unless
+ * multi_schedule_context_wakeup(m, mi) is also called.
+ */
+ interval_action (&c->c2.tmp_int);
+ context_immediate_reschedule (c); /* ZERO-TIMEOUT */
+
+ msg (msglevel, "SENT CONTROL [%s]: '%s' (status=%d)",
+ tls_common_name (c->c2.tls_multi, false),
+ sanitize_control_message (str, &gc),
+ (int) stat);
+
+ gc_free (&gc);
+ return stat;
+ }
+#endif
+ return true;
+}
+
+/*
+ * Add routes.
+ */
+
+static void
+check_add_routes_action (struct context *c, const bool errors)
+{
+ do_route (&c->options, c->c1.route_list, c->c1.route_ipv6_list,
+ c->c1.tuntap, c->plugins, c->c2.es);
+ update_time ();
+ event_timeout_clear (&c->c2.route_wakeup);
+ event_timeout_clear (&c->c2.route_wakeup_expire);
+ initialization_sequence_completed (c, errors ? ISC_ERRORS : 0); /* client/p2p --route-delay was defined */
+}
+
+void
+check_add_routes_dowork (struct context *c)
+{
+ if (test_routes (c->c1.route_list, c->c1.tuntap))
+ {
+ check_add_routes_action (c, false);
+ }
+ else if (event_timeout_trigger (&c->c2.route_wakeup_expire, &c->c2.timeval, ETT_DEFAULT))
+ {
+ check_add_routes_action (c, true);
+ }
+ else
+ {
+ msg (D_ROUTE, "Route: Waiting for TUN/TAP interface to come up...");
+ if (c->c1.tuntap)
+ {
+ if (!tun_standby (c->c1.tuntap))
+ {
+ register_signal (c, SIGHUP, "ip-fail");
+ c->persist.restart_sleep_seconds = 10;
+#ifdef WIN32
+ show_routes (M_INFO|M_NOPREFIX);
+ show_adapters (M_INFO|M_NOPREFIX);
+#endif
+ }
+ }
+ update_time ();
+ if (c->c2.route_wakeup.n != 1)
+ event_timeout_init (&c->c2.route_wakeup, 1, now);
+ event_timeout_reset (&c->c2.ping_rec_interval);
+ }
+}
+
+/*
+ * Should we exit due to inactivity timeout?
+ */
+void
+check_inactivity_timeout_dowork (struct context *c)
+{
+ msg (M_INFO, "Inactivity timeout (--inactive), exiting");
+ register_signal (c, SIGTERM, "inactive");
+}
+
+#if P2MP
+
+void
+check_server_poll_timeout_dowork (struct context *c)
+{
+ event_timeout_reset (&c->c2.server_poll_interval);
+ if (!tls_initial_packet_received (c->c2.tls_multi))
+ {
+ msg (M_INFO, "Server poll timeout, restarting");
+ register_signal (c, SIGUSR1, "server_poll");
+ c->persist.restart_sleep_seconds = -1;
+ }
+}
+
+/*
+ * Schedule a signal n_seconds from now.
+ */
+void
+schedule_exit (struct context *c, const int n_seconds, const int signal)
+{
+ tls_set_single_session (c->c2.tls_multi);
+ update_time ();
+ reset_coarse_timers (c);
+ event_timeout_init (&c->c2.scheduled_exit, n_seconds, now);
+ c->c2.scheduled_exit_signal = signal;
+ msg (D_SCHED_EXIT, "Delayed exit in %d seconds", n_seconds);
+}
+
+/*
+ * Scheduled exit?
+ */
+void
+check_scheduled_exit_dowork (struct context *c)
+{
+ register_signal (c, c->c2.scheduled_exit_signal, "delayed-exit");
+}
+
+#endif
+
+/*
+ * Should we write timer-triggered status file.
+ */
+void
+check_status_file_dowork (struct context *c)
+{
+ if (c->c1.status_output)
+ print_status (c, c->c1.status_output);
+}
+
+#ifdef ENABLE_FRAGMENT
+/*
+ * Should we deliver a datagram fragment to remote?
+ */
+void
+check_fragment_dowork (struct context *c)
+{
+ struct link_socket_info *lsi = get_link_socket_info (c);
+
+ /* OS MTU Hint? */
+ if (lsi->mtu_changed && c->c2.ipv4_tun)
+ {
+ frame_adjust_path_mtu (&c->c2.frame_fragment, c->c2.link_socket->mtu,
+ c->options.ce.proto);
+ lsi->mtu_changed = false;
+ }
+
+ if (fragment_outgoing_defined (c->c2.fragment))
+ {
+ if (!c->c2.to_link.len)
+ {
+ /* encrypt a fragment for output to TCP/UDP port */
+ ASSERT (fragment_ready_to_send (c->c2.fragment, &c->c2.buf, &c->c2.frame_fragment));
+ encrypt_sign (c, false);
+ }
+ }
+
+ fragment_housekeeping (c->c2.fragment, &c->c2.frame_fragment, &c->c2.timeval);
+}
+#endif
+
+/*
+ * Buffer reallocation, for use with null encryption.
+ */
+static inline void
+buffer_turnover (const uint8_t *orig_buf, struct buffer *dest_stub, struct buffer *src_stub, struct buffer *storage)
+{
+ if (orig_buf == src_stub->data && src_stub->data != storage->data)
+ {
+ buf_assign (storage, src_stub);
+ *dest_stub = *storage;
+ }
+ else
+ {
+ *dest_stub = *src_stub;
+ }
+}
+
+/*
+ * Compress, fragment, encrypt and HMAC-sign an outgoing packet.
+ * Input: c->c2.buf
+ * Output: c->c2.to_link
+ */
+void
+encrypt_sign (struct context *c, bool comp_frag)
+{
+ struct context_buffers *b = c->c2.buffers;
+ const uint8_t *orig_buf = c->c2.buf.data;
+
+#if P2MP_SERVER
+ /*
+ * Drop non-TLS outgoing packet if client-connect script/plugin
+ * has not yet succeeded.
+ */
+ if (c->c2.context_auth != CAS_SUCCEEDED)
+ c->c2.buf.len = 0;
+#endif
+
+ if (comp_frag)
+ {
+#ifdef ENABLE_LZO
+ /* Compress the packet. */
+ if (lzo_defined (&c->c2.lzo_compwork))
+ lzo_compress (&c->c2.buf, b->lzo_compress_buf, &c->c2.lzo_compwork, &c->c2.frame);
+#endif
+#ifdef ENABLE_FRAGMENT
+ if (c->c2.fragment)
+ fragment_outgoing (c->c2.fragment, &c->c2.buf, &c->c2.frame_fragment);
+#endif
+ }
+
+#ifdef ENABLE_CRYPTO
+#ifdef ENABLE_SSL
+ /*
+ * If TLS mode, get the key we will use to encrypt
+ * the packet.
+ */
+ if (c->c2.tls_multi)
+ {
+ tls_pre_encrypt (c->c2.tls_multi, &c->c2.buf, &c->c2.crypto_options);
+ }
+#endif
+
+ /*
+ * Encrypt the packet and write an optional
+ * HMAC signature.
+ */
+ openvpn_encrypt (&c->c2.buf, b->encrypt_buf, &c->c2.crypto_options, &c->c2.frame);
+#endif
+ /*
+ * Get the address we will be sending the packet to.
+ */
+ link_socket_get_outgoing_addr (&c->c2.buf, get_link_socket_info (c),
+ &c->c2.to_link_addr);
+#ifdef ENABLE_CRYPTO
+#ifdef ENABLE_SSL
+ /*
+ * In TLS mode, prepend the appropriate one-byte opcode
+ * to the packet which identifies it as a data channel
+ * packet and gives the low-permutation version of
+ * the key-id to the recipient so it knows which
+ * decrypt key to use.
+ */
+ if (c->c2.tls_multi)
+ {
+ tls_post_encrypt (c->c2.tls_multi, &c->c2.buf);
+ }
+#endif
+#endif
+
+ /* if null encryption, copy result to read_tun_buf */
+ buffer_turnover (orig_buf, &c->c2.to_link, &c->c2.buf, &b->read_tun_buf);
+}
+
+/*
+ * Coarse timers work to 1 second resolution.
+ */
+static void
+process_coarse_timers (struct context *c)
+{
+#ifdef ENABLE_CRYPTO
+ /* flush current packet-id to file once per 60
+ seconds if --replay-persist was specified */
+ check_packet_id_persist_flush (c);
+#endif
+
+ /* should we update status file? */
+ check_status_file (c);
+
+ /* process connection establishment items */
+ check_connection_established (c);
+
+#if P2MP
+ /* see if we should send a push_request in response to --pull */
+ check_push_request (c);
+#endif
+
+#ifdef PLUGIN_PF
+ pf_check_reload (c);
+#endif
+
+ /* process --route options */
+ check_add_routes (c);
+
+ /* possibly exit due to --inactive */
+ check_inactivity_timeout (c);
+ if (c->sig->signal_received)
+ return;
+
+ /* restart if ping not received */
+ check_ping_restart (c);
+ if (c->sig->signal_received)
+ return;
+
+#if P2MP
+ check_server_poll_timeout (c);
+ if (c->sig->signal_received)
+ return;
+
+ check_scheduled_exit (c);
+ if (c->sig->signal_received)
+ return;
+#endif
+
+#ifdef ENABLE_OCC
+ /* Should we send an OCC_REQUEST message? */
+ check_send_occ_req (c);
+
+ /* Should we send an MTU load test? */
+ check_send_occ_load_test (c);
+
+ /* Should we send an OCC_EXIT message to remote? */
+ if (c->c2.explicit_exit_notification_time_wait)
+ process_explicit_exit_notification_timer_wakeup (c);
+#endif
+
+ /* Should we ping the remote? */
+ check_ping_send (c);
+}
+
+static void
+check_coarse_timers_dowork (struct context *c)
+{
+ const struct timeval save = c->c2.timeval;
+ c->c2.timeval.tv_sec = BIG_TIMEOUT;
+ c->c2.timeval.tv_usec = 0;
+ process_coarse_timers (c);
+ c->c2.coarse_timer_wakeup = now + c->c2.timeval.tv_sec;
+
+ dmsg (D_INTERVAL, "TIMER: coarse timer wakeup %d seconds", (int) c->c2.timeval.tv_sec);
+
+ /* Is the coarse timeout NOT the earliest one? */
+ if (c->c2.timeval.tv_sec > save.tv_sec)
+ c->c2.timeval = save;
+}
+
+static inline void
+check_coarse_timers (struct context *c)
+{
+ const time_t local_now = now;
+ if (local_now >= c->c2.coarse_timer_wakeup)
+ check_coarse_timers_dowork (c);
+ else
+ context_reschedule_sec (c, c->c2.coarse_timer_wakeup - local_now);
+}
+
+static void
+check_timeout_random_component_dowork (struct context *c)
+{
+ const int update_interval = 10; /* seconds */
+ c->c2.update_timeout_random_component = now + update_interval;
+ c->c2.timeout_random_component.tv_usec = (time_t) get_random () & 0x0003FFFF;
+ c->c2.timeout_random_component.tv_sec = 0;
+
+ dmsg (D_INTERVAL, "RANDOM USEC=%d", (int) c->c2.timeout_random_component.tv_usec);
+}
+
+static inline void
+check_timeout_random_component (struct context *c)
+{
+ if (now >= c->c2.update_timeout_random_component)
+ check_timeout_random_component_dowork (c);
+ if (c->c2.timeval.tv_sec >= 1)
+ tv_add (&c->c2.timeval, &c->c2.timeout_random_component);
+}
+
+#ifdef ENABLE_SOCKS
+
+/*
+ * Handle addition and removal of the 10-byte Socks5 header
+ * in UDP packets.
+ */
+
+static inline void
+socks_postprocess_incoming_link (struct context *c)
+{
+ if (c->c2.link_socket->socks_proxy && c->c2.link_socket->info.proto == PROTO_UDPv4)
+ socks_process_incoming_udp (&c->c2.buf, &c->c2.from);
+}
+
+static inline void
+socks_preprocess_outgoing_link (struct context *c,
+ struct link_socket_actual **to_addr,
+ int *size_delta)
+{
+ if (c->c2.link_socket->socks_proxy && c->c2.link_socket->info.proto == PROTO_UDPv4)
+ {
+ *size_delta += socks_process_outgoing_udp (&c->c2.to_link, c->c2.to_link_addr);
+ *to_addr = &c->c2.link_socket->socks_relay;
+ }
+}
+
+/* undo effect of socks_preprocess_outgoing_link */
+static inline void
+link_socket_write_post_size_adjust (int *size,
+ int size_delta,
+ struct buffer *buf)
+{
+ if (size_delta > 0 && *size > size_delta)
+ {
+ *size -= size_delta;
+ if (!buf_advance (buf, size_delta))
+ *size = 0;
+ }
+}
+#endif
+
+/*
+ * Output: c->c2.buf
+ */
+
+void
+read_incoming_link (struct context *c)
+{
+ /*
+ * Set up for recvfrom call to read datagram
+ * sent to our TCP/UDP port.
+ */
+ int status;
+
+ /*ASSERT (!c->c2.to_tun.len);*/
+
+ perf_push (PERF_READ_IN_LINK);
+
+ c->c2.buf = c->c2.buffers->read_link_buf;
+ ASSERT (buf_init (&c->c2.buf, FRAME_HEADROOM_ADJ (&c->c2.frame, FRAME_HEADROOM_MARKER_READ_LINK)));
+
+ status = link_socket_read (c->c2.link_socket,
+ &c->c2.buf,
+ MAX_RW_SIZE_LINK (&c->c2.frame),
+ &c->c2.from);
+
+ if (socket_connection_reset (c->c2.link_socket, status))
+ {
+#if PORT_SHARE
+ if (port_share && socket_foreign_protocol_detected (c->c2.link_socket))
+ {
+ const struct buffer *fbuf = socket_foreign_protocol_head (c->c2.link_socket);
+ const int sd = socket_foreign_protocol_sd (c->c2.link_socket);
+ port_share_redirect (port_share, fbuf, sd);
+ register_signal (c, SIGTERM, "port-share-redirect");
+ }
+ else
+#endif
+ {
+ /* received a disconnect from a connection-oriented protocol */
+ if (c->options.inetd)
+ {
+ register_signal (c, SIGTERM, "connection-reset-inetd");
+ msg (D_STREAM_ERRORS, "Connection reset, inetd/xinetd exit [%d]", status);
+ }
+ else
+ {
+#ifdef ENABLE_OCC
+ if (event_timeout_defined(&c->c2.explicit_exit_notification_interval))
+ {
+ msg (D_STREAM_ERRORS, "Connection reset during exit notification period, ignoring [%d]", status);
+ openvpn_sleep(1);
+ }
+ else
+#endif
+ {
+ register_signal (c, SIGUSR1, "connection-reset"); /* SOFT-SIGUSR1 -- TCP connection reset */
+ msg (D_STREAM_ERRORS, "Connection reset, restarting [%d]", status);
+ }
+ }
+ }
+ perf_pop ();
+ return;
+ }
+
+ /* check recvfrom status */
+ check_status (status, "read", c->c2.link_socket, NULL);
+
+#ifdef ENABLE_SOCKS
+ /* Remove socks header if applicable */
+ socks_postprocess_incoming_link (c);
+#endif
+
+ perf_pop ();
+}
+
+/*
+ * Input: c->c2.buf
+ * Output: c->c2.to_tun
+ */
+
+void
+process_incoming_link (struct context *c)
+{
+ struct gc_arena gc = gc_new ();
+ bool decrypt_status;
+ struct link_socket_info *lsi = get_link_socket_info (c);
+ const uint8_t *orig_buf = c->c2.buf.data;
+
+ perf_push (PERF_PROC_IN_LINK);
+
+ if (c->c2.buf.len > 0)
+ {
+ c->c2.link_read_bytes += c->c2.buf.len;
+ link_read_bytes_global += c->c2.buf.len;
+#ifdef ENABLE_MEMSTATS
+ if (mmap_stats)
+ mmap_stats->link_read_bytes = link_read_bytes_global;
+#endif
+ c->c2.original_recv_size = c->c2.buf.len;
+#ifdef ENABLE_MANAGEMENT
+ if (management)
+ {
+ management_bytes_in (management, c->c2.buf.len);
+#ifdef MANAGEMENT_DEF_AUTH
+ management_bytes_server (management, &c->c2.link_read_bytes, &c->c2.link_write_bytes, &c->c2.mda_context);
+#endif
+ }
+#endif
+ }
+ else
+ c->c2.original_recv_size = 0;
+
+#ifdef ENABLE_DEBUG
+ /* take action to corrupt packet if we are in gremlin test mode */
+ if (c->options.gremlin) {
+ if (!ask_gremlin (c->options.gremlin))
+ c->c2.buf.len = 0;
+ corrupt_gremlin (&c->c2.buf, c->options.gremlin);
+ }
+#endif
+
+ /* log incoming packet */
+#ifdef LOG_RW
+ if (c->c2.log_rw && c->c2.buf.len > 0)
+ fprintf (stderr, "R");
+#endif
+ msg (D_LINK_RW, "%s READ [%d] from %s: %s",
+ proto2ascii (lsi->proto, true),
+ BLEN (&c->c2.buf),
+ print_link_socket_actual (&c->c2.from, &gc),
+ PROTO_DUMP (&c->c2.buf, &gc));
+
+ /*
+ * Good, non-zero length packet received.
+ * Commence multi-stage processing of packet,
+ * such as authenticate, decrypt, decompress.
+ * If any stage fails, it sets buf.len to 0 or -1,
+ * telling downstream stages to ignore the packet.
+ */
+ if (c->c2.buf.len > 0)
+ {
+ if (!link_socket_verify_incoming_addr (&c->c2.buf, lsi, &c->c2.from))
+ link_socket_bad_incoming_addr (&c->c2.buf, lsi, &c->c2.from);
+
+#ifdef ENABLE_CRYPTO
+#ifdef ENABLE_SSL
+ if (c->c2.tls_multi)
+ {
+ /*
+ * If tls_pre_decrypt returns true, it means the incoming
+ * packet was a good TLS control channel packet. If so, TLS code
+ * will deal with the packet and set buf.len to 0 so downstream
+ * stages ignore it.
+ *
+ * If the packet is a data channel packet, tls_pre_decrypt
+ * will load crypto_options with the correct encryption key
+ * and return false.
+ */
+ if (tls_pre_decrypt (c->c2.tls_multi, &c->c2.from, &c->c2.buf, &c->c2.crypto_options))
+ {
+ interval_action (&c->c2.tmp_int);
+
+ /* reset packet received timer if TLS packet */
+ if (c->options.ping_rec_timeout)
+ event_timeout_reset (&c->c2.ping_rec_interval);
+ }
+ }
+#if P2MP_SERVER
+ /*
+ * Drop non-TLS packet if client-connect script/plugin has not
+ * yet succeeded.
+ */
+ if (c->c2.context_auth != CAS_SUCCEEDED)
+ c->c2.buf.len = 0;
+#endif
+#endif /* ENABLE_SSL */
+
+ /* authenticate and decrypt the incoming packet */
+ decrypt_status = openvpn_decrypt (&c->c2.buf, c->c2.buffers->decrypt_buf, &c->c2.crypto_options, &c->c2.frame);
+
+ if (!decrypt_status && link_socket_connection_oriented (c->c2.link_socket))
+ {
+ /* decryption errors are fatal in TCP mode */
+ register_signal (c, SIGUSR1, "decryption-error"); /* SOFT-SIGUSR1 -- decryption error in TCP mode */
+ msg (D_STREAM_ERRORS, "Fatal decryption error (process_incoming_link), restarting");
+ goto done;
+ }
+
+#endif /* ENABLE_CRYPTO */
+
+#ifdef ENABLE_FRAGMENT
+ if (c->c2.fragment)
+ fragment_incoming (c->c2.fragment, &c->c2.buf, &c->c2.frame_fragment);
+#endif
+
+#ifdef ENABLE_LZO
+ /* decompress the incoming packet */
+ if (lzo_defined (&c->c2.lzo_compwork))
+ lzo_decompress (&c->c2.buf, c->c2.buffers->lzo_decompress_buf, &c->c2.lzo_compwork, &c->c2.frame);
+#endif
+
+#ifdef PACKET_TRUNCATION_CHECK
+ /* if (c->c2.buf.len > 1) --c->c2.buf.len; */
+ ipv4_packet_size_verify (BPTR (&c->c2.buf),
+ BLEN (&c->c2.buf),
+ TUNNEL_TYPE (c->c1.tuntap),
+ "POST_DECRYPT",
+ &c->c2.n_trunc_post_decrypt);
+#endif
+
+ /*
+ * Set our "official" outgoing address, since
+ * if buf.len is non-zero, we know the packet
+ * authenticated. In TLS mode we do nothing
+ * because TLS mode takes care of source address
+ * authentication.
+ *
+ * Also, update the persisted version of our packet-id.
+ */
+ if (!TLS_MODE (c))
+ link_socket_set_outgoing_addr (&c->c2.buf, lsi, &c->c2.from, NULL, c->c2.es);
+
+ /* reset packet received timer */
+ if (c->options.ping_rec_timeout && c->c2.buf.len > 0)
+ event_timeout_reset (&c->c2.ping_rec_interval);
+
+ /* increment authenticated receive byte count */
+ if (c->c2.buf.len > 0)
+ {
+ c->c2.link_read_bytes_auth += c->c2.buf.len;
+ c->c2.max_recv_size_local = max_int (c->c2.original_recv_size, c->c2.max_recv_size_local);
+ }
+
+ /* Did we just receive an openvpn ping packet? */
+ if (is_ping_msg (&c->c2.buf))
+ {
+ dmsg (D_PING, "RECEIVED PING PACKET");
+ c->c2.buf.len = 0; /* drop packet */
+ }
+
+#ifdef ENABLE_OCC
+ /* Did we just receive an OCC packet? */
+ if (is_occ_msg (&c->c2.buf))
+ process_received_occ_msg (c);
+#endif
+
+ buffer_turnover (orig_buf, &c->c2.to_tun, &c->c2.buf, &c->c2.buffers->read_link_buf);
+
+ /* to_tun defined + unopened tuntap can cause deadlock */
+ if (!tuntap_defined (c->c1.tuntap))
+ c->c2.to_tun.len = 0;
+ }
+ else
+ {
+ buf_reset (&c->c2.to_tun);
+ }
+ done:
+ perf_pop ();
+ gc_free (&gc);
+}
+
+/*
+ * Output: c->c2.buf
+ */
+
+void
+read_incoming_tun (struct context *c)
+{
+ /*
+ * Setup for read() call on TUN/TAP device.
+ */
+ /*ASSERT (!c->c2.to_link.len);*/
+
+ perf_push (PERF_READ_IN_TUN);
+
+ c->c2.buf = c->c2.buffers->read_tun_buf;
+#ifdef TUN_PASS_BUFFER
+ read_tun_buffered (c->c1.tuntap, &c->c2.buf, MAX_RW_SIZE_TUN (&c->c2.frame));
+#else
+ ASSERT (buf_init (&c->c2.buf, FRAME_HEADROOM (&c->c2.frame)));
+ ASSERT (buf_safe (&c->c2.buf, MAX_RW_SIZE_TUN (&c->c2.frame)));
+ c->c2.buf.len = read_tun (c->c1.tuntap, BPTR (&c->c2.buf), MAX_RW_SIZE_TUN (&c->c2.frame));
+#endif
+
+#ifdef PACKET_TRUNCATION_CHECK
+ ipv4_packet_size_verify (BPTR (&c->c2.buf),
+ BLEN (&c->c2.buf),
+ TUNNEL_TYPE (c->c1.tuntap),
+ "READ_TUN",
+ &c->c2.n_trunc_tun_read);
+#endif
+
+ /* Was TUN/TAP interface stopped? */
+ if (tuntap_stop (c->c2.buf.len))
+ {
+ register_signal (c, SIGTERM, "tun-stop");
+ msg (M_INFO, "TUN/TAP interface has been stopped, exiting");
+ perf_pop ();
+ return;
+ }
+
+ /* Check the status return from read() */
+ check_status (c->c2.buf.len, "read from TUN/TAP", NULL, c->c1.tuntap);
+
+ perf_pop ();
+}
+
+/*
+ * Input: c->c2.buf
+ * Output: c->c2.to_link
+ */
+
+void
+process_incoming_tun (struct context *c)
+{
+ struct gc_arena gc = gc_new ();
+
+ perf_push (PERF_PROC_IN_TUN);
+
+ if (c->c2.buf.len > 0)
+ c->c2.tun_read_bytes += c->c2.buf.len;
+
+#ifdef LOG_RW
+ if (c->c2.log_rw && c->c2.buf.len > 0)
+ fprintf (stderr, "r");
+#endif
+
+ /* Show packet content */
+ dmsg (D_TUN_RW, "TUN READ [%d]", BLEN (&c->c2.buf));
+
+ if (c->c2.buf.len > 0)
+ {
+ /*
+ * The --passtos and --mssfix options require
+ * us to examine the IPv4 header.
+ */
+ process_ipv4_header (c, PIPV4_PASSTOS|PIPV4_MSSFIX|PIPV4_CLIENT_NAT, &c->c2.buf);
+
+#ifdef PACKET_TRUNCATION_CHECK
+ /* if (c->c2.buf.len > 1) --c->c2.buf.len; */
+ ipv4_packet_size_verify (BPTR (&c->c2.buf),
+ BLEN (&c->c2.buf),
+ TUNNEL_TYPE (c->c1.tuntap),
+ "PRE_ENCRYPT",
+ &c->c2.n_trunc_pre_encrypt);
+#endif
+
+ encrypt_sign (c, true);
+ }
+ else
+ {
+ buf_reset (&c->c2.to_link);
+ }
+ perf_pop ();
+ gc_free (&gc);
+}
+
+void
+process_ipv4_header (struct context *c, unsigned int flags, struct buffer *buf)
+{
+ if (!c->options.ce.mssfix)
+ flags &= ~PIPV4_MSSFIX;
+#if PASSTOS_CAPABILITY
+ if (!c->options.passtos)
+ flags &= ~PIPV4_PASSTOS;
+#endif
+ if (!c->options.route_gateway_via_dhcp)
+ flags &= ~PIPV4_EXTRACT_DHCP_ROUTER;
+
+ if (buf->len > 0)
+ {
+ /*
+ * The --passtos and --mssfix options require
+ * us to examine the IPv4 header.
+ */
+#if PASSTOS_CAPABILITY
+ if (flags & (PIPV4_PASSTOS|PIPV4_MSSFIX))
+#else
+ if (flags & PIPV4_MSSFIX)
+#endif
+ {
+ struct buffer ipbuf = *buf;
+ if (is_ipv4 (TUNNEL_TYPE (c->c1.tuntap), &ipbuf))
+ {
+#if PASSTOS_CAPABILITY
+ /* extract TOS from IP header */
+ if (flags & PIPV4_PASSTOS)
+ link_socket_extract_tos (c->c2.link_socket, &ipbuf);
+#endif
+
+ /* possibly alter the TCP MSS */
+ if (flags & PIPV4_MSSFIX)
+ mss_fixup (&ipbuf, MTU_TO_MSS (TUN_MTU_SIZE_DYNAMIC (&c->c2.frame)));
+
+#ifdef ENABLE_CLIENT_NAT
+ /* possibly do NAT on packet */
+ if ((flags & PIPV4_CLIENT_NAT) && c->options.client_nat)
+ {
+ const int direction = (flags & PIPV4_OUTGOING) ? CN_INCOMING : CN_OUTGOING;
+ client_nat_transform (c->options.client_nat, &ipbuf, direction);
+ }
+#endif
+ /* possibly extract a DHCP router message */
+ if (flags & PIPV4_EXTRACT_DHCP_ROUTER)
+ {
+ const in_addr_t dhcp_router = dhcp_extract_router_msg (&ipbuf);
+ if (dhcp_router)
+ route_list_add_vpn_gateway (c->c1.route_list, c->c2.es, dhcp_router);
+ }
+ }
+ }
+ }
+}
+
+/*
+ * Input: c->c2.to_link
+ */
+
+void
+process_outgoing_link (struct context *c)
+{
+ struct gc_arena gc = gc_new ();
+
+ perf_push (PERF_PROC_OUT_LINK);
+
+ if (c->c2.to_link.len > 0 && c->c2.to_link.len <= EXPANDED_SIZE (&c->c2.frame))
+ {
+ /*
+ * Setup for call to send/sendto which will send
+ * packet to remote over the TCP/UDP port.
+ */
+ int size = 0;
+ ASSERT (link_socket_actual_defined (c->c2.to_link_addr));
+
+#ifdef ENABLE_DEBUG
+ /* In gremlin-test mode, we may choose to drop this packet */
+ if (!c->options.gremlin || ask_gremlin (c->options.gremlin))
+#endif
+ {
+ /*
+ * Let the traffic shaper know how many bytes
+ * we wrote.
+ */
+#ifdef ENABLE_FEATURE_SHAPER
+ if (c->options.shaper)
+ shaper_wrote_bytes (&c->c2.shaper, BLEN (&c->c2.to_link)
+ + datagram_overhead (c->options.ce.proto));
+#endif
+ /*
+ * Let the pinger know that we sent a packet.
+ */
+ if (c->options.ping_send_timeout)
+ event_timeout_reset (&c->c2.ping_send_interval);
+
+#if PASSTOS_CAPABILITY
+ /* Set TOS */
+ link_socket_set_tos (c->c2.link_socket);
+#endif
+
+ /* Log packet send */
+#ifdef LOG_RW
+ if (c->c2.log_rw)
+ fprintf (stderr, "W");
+#endif
+ msg (D_LINK_RW, "%s WRITE [%d] to %s: %s",
+ proto2ascii (c->c2.link_socket->info.proto, true),
+ BLEN (&c->c2.to_link),
+ print_link_socket_actual (c->c2.to_link_addr, &gc),
+ PROTO_DUMP (&c->c2.to_link, &gc));
+
+ /* Packet send complexified by possible Socks5 usage */
+ {
+ struct link_socket_actual *to_addr = c->c2.to_link_addr;
+#ifdef ENABLE_SOCKS
+ int size_delta = 0;
+#endif
+
+#ifdef ENABLE_SOCKS
+ /* If Socks5 over UDP, prepend header */
+ socks_preprocess_outgoing_link (c, &to_addr, &size_delta);
+#endif
+ /* Send packet */
+ size = link_socket_write (c->c2.link_socket,
+ &c->c2.to_link,
+ to_addr);
+
+#ifdef ENABLE_SOCKS
+ /* Undo effect of prepend */
+ link_socket_write_post_size_adjust (&size, size_delta, &c->c2.to_link);
+#endif
+ }
+
+ if (size > 0)
+ {
+ c->c2.max_send_size_local = max_int (size, c->c2.max_send_size_local);
+ c->c2.link_write_bytes += size;
+ link_write_bytes_global += size;
+#ifdef ENABLE_MEMSTATS
+ if (mmap_stats)
+ mmap_stats->link_write_bytes = link_write_bytes_global;
+#endif
+#ifdef ENABLE_MANAGEMENT
+ if (management)
+ {
+ management_bytes_out (management, size);
+#ifdef MANAGEMENT_DEF_AUTH
+ management_bytes_server (management, &c->c2.link_read_bytes, &c->c2.link_write_bytes, &c->c2.mda_context);
+#endif
+ }
+#endif
+ }
+ }
+
+ /* Check return status */
+ check_status (size, "write", c->c2.link_socket, NULL);
+
+ if (size > 0)
+ {
+ /* Did we write a different size packet than we intended? */
+ if (size != BLEN (&c->c2.to_link))
+ msg (D_LINK_ERRORS,
+ "TCP/UDP packet was truncated/expanded on write to %s (tried=%d,actual=%d)",
+ print_link_socket_actual (c->c2.to_link_addr, &gc),
+ BLEN (&c->c2.to_link),
+ size);
+ }
+
+ /* if not a ping/control message, indicate activity regarding --inactive parameter */
+ if (c->c2.buf.len > 0 )
+ register_activity (c, size);
+ }
+ else
+ {
+ if (c->c2.to_link.len > 0)
+ msg (D_LINK_ERRORS, "TCP/UDP packet too large on write to %s (tried=%d,max=%d)",
+ print_link_socket_actual (c->c2.to_link_addr, &gc),
+ c->c2.to_link.len,
+ EXPANDED_SIZE (&c->c2.frame));
+ }
+
+ buf_reset (&c->c2.to_link);
+
+ perf_pop ();
+ gc_free (&gc);
+}
+
+/*
+ * Input: c->c2.to_tun
+ */
+
+void
+process_outgoing_tun (struct context *c)
+{
+ struct gc_arena gc = gc_new ();
+
+ /*
+ * Set up for write() call to TUN/TAP
+ * device.
+ */
+ if (c->c2.to_tun.len <= 0)
+ return;
+
+ perf_push (PERF_PROC_OUT_TUN);
+
+ /*
+ * The --mssfix option requires
+ * us to examine the IPv4 header.
+ */
+ process_ipv4_header (c, PIPV4_MSSFIX|PIPV4_EXTRACT_DHCP_ROUTER|PIPV4_CLIENT_NAT|PIPV4_OUTGOING, &c->c2.to_tun);
+
+ if (c->c2.to_tun.len <= MAX_RW_SIZE_TUN (&c->c2.frame))
+ {
+ /*
+ * Write to TUN/TAP device.
+ */
+ int size;
+
+#ifdef LOG_RW
+ if (c->c2.log_rw)
+ fprintf (stderr, "w");
+#endif
+ dmsg (D_TUN_RW, "TUN WRITE [%d]", BLEN (&c->c2.to_tun));
+
+#ifdef PACKET_TRUNCATION_CHECK
+ ipv4_packet_size_verify (BPTR (&c->c2.to_tun),
+ BLEN (&c->c2.to_tun),
+ TUNNEL_TYPE (c->c1.tuntap),
+ "WRITE_TUN",
+ &c->c2.n_trunc_tun_write);
+#endif
+
+#ifdef TUN_PASS_BUFFER
+ size = write_tun_buffered (c->c1.tuntap, &c->c2.to_tun);
+#else
+ size = write_tun (c->c1.tuntap, BPTR (&c->c2.to_tun), BLEN (&c->c2.to_tun));
+#endif
+
+ if (size > 0)
+ c->c2.tun_write_bytes += size;
+ check_status (size, "write to TUN/TAP", NULL, c->c1.tuntap);
+
+ /* check written packet size */
+ if (size > 0)
+ {
+ /* Did we write a different size packet than we intended? */
+ if (size != BLEN (&c->c2.to_tun))
+ msg (D_LINK_ERRORS,
+ "TUN/TAP packet was destructively fragmented on write to %s (tried=%d,actual=%d)",
+ c->c1.tuntap->actual_name,
+ BLEN (&c->c2.to_tun),
+ size);
+
+ /* indicate activity regarding --inactive parameter */
+ register_activity (c, size);
+ }
+ }
+ else
+ {
+ /*
+ * This should never happen, probably indicates some kind
+ * of MTU mismatch.
+ */
+ msg (D_LINK_ERRORS, "tun packet too large on write (tried=%d,max=%d)",
+ c->c2.to_tun.len,
+ MAX_RW_SIZE_TUN (&c->c2.frame));
+ }
+
+ buf_reset (&c->c2.to_tun);
+
+ perf_pop ();
+ gc_free (&gc);
+}
+
+void
+pre_select (struct context *c)
+{
+ /* make sure current time (now) is updated on function entry */
+
+ /*
+ * Start with an effectively infinite timeout, then let it
+ * reduce to a timeout that reflects the component which
+ * needs the earliest service.
+ */
+ c->c2.timeval.tv_sec = BIG_TIMEOUT;
+ c->c2.timeval.tv_usec = 0;
+
+#if defined(WIN32)
+ if (check_debug_level (D_TAP_WIN_DEBUG))
+ {
+ c->c2.timeval.tv_sec = 1;
+ if (tuntap_defined (c->c1.tuntap))
+ tun_show_debug (c->c1.tuntap);
+ }
+#endif
+
+ /* check coarse timers? */
+ check_coarse_timers (c);
+ if (c->sig->signal_received)
+ return;
+
+ /* Does TLS need service? */
+ check_tls (c);
+
+ /* In certain cases, TLS errors will require a restart */
+ check_tls_errors (c);
+ if (c->sig->signal_received)
+ return;
+
+ /* check for incoming configuration info on the control channel */
+ check_incoming_control_channel (c);
+
+#ifdef ENABLE_OCC
+ /* Should we send an OCC message? */
+ check_send_occ_msg (c);
+#endif
+
+#ifdef ENABLE_FRAGMENT
+ /* Should we deliver a datagram fragment to remote? */
+ check_fragment (c);
+#endif
+
+ /* Update random component of timeout */
+ check_timeout_random_component (c);
+}
+
+/*
+ * Wait for I/O events. Used for both TCP & UDP sockets
+ * in point-to-point mode and for UDP sockets in
+ * point-to-multipoint mode.
+ */
+
+void
+io_wait_dowork (struct context *c, const unsigned int flags)
+{
+ unsigned int socket = 0;
+ unsigned int tuntap = 0;
+ struct event_set_return esr[4];
+
+ /* These shifts all depend on EVENT_READ and EVENT_WRITE */
+ static int socket_shift = 0; /* depends on SOCKET_READ and SOCKET_WRITE */
+ static int tun_shift = 2; /* depends on TUN_READ and TUN_WRITE */
+ static int err_shift = 4; /* depends on ES_ERROR */
+#ifdef ENABLE_MANAGEMENT
+ static int management_shift = 6; /* depends on MANAGEMENT_READ and MANAGEMENT_WRITE */
+#endif
+
+ /*
+ * Decide what kind of events we want to wait for.
+ */
+ event_reset (c->c2.event_set);
+
+ /*
+ * On win32 we use the keyboard or an event object as a source
+ * of asynchronous signals.
+ */
+ if (flags & IOW_WAIT_SIGNAL)
+ wait_signal (c->c2.event_set, (void*)&err_shift);
+
+ /*
+ * If outgoing data (for TCP/UDP port) pending, wait for ready-to-send
+ * status from TCP/UDP port. Otherwise, wait for incoming data on
+ * TUN/TAP device.
+ */
+ if (flags & IOW_TO_LINK)
+ {
+ if (flags & IOW_SHAPER)
+ {
+ /*
+ * If sending this packet would put us over our traffic shaping
+ * quota, don't send -- instead compute the delay we must wait
+ * until it will be OK to send the packet.
+ */
+#ifdef ENABLE_FEATURE_SHAPER
+ int delay = 0;
+
+ /* set traffic shaping delay in microseconds */
+ if (c->options.shaper)
+ delay = max_int (delay, shaper_delay (&c->c2.shaper));
+
+ if (delay < 1000)
+ {
+ socket |= EVENT_WRITE;
+ }
+ else
+ {
+ shaper_soonest_event (&c->c2.timeval, delay);
+ }
+#else /* ENABLE_FEATURE_SHAPER */
+ socket |= EVENT_WRITE;
+#endif /* ENABLE_FEATURE_SHAPER */
+ }
+ else
+ {
+ socket |= EVENT_WRITE;
+ }
+ }
+ else if (!((flags & IOW_FRAG) && TO_LINK_FRAG (c)))
+ {
+ if (flags & IOW_READ_TUN)
+ tuntap |= EVENT_READ;
+ }
+
+ /*
+ * If outgoing data (for TUN/TAP device) pending, wait for ready-to-send status
+ * from device. Otherwise, wait for incoming data on TCP/UDP port.
+ */
+ if (flags & IOW_TO_TUN)
+ {
+ tuntap |= EVENT_WRITE;
+ }
+ else
+ {
+ if (flags & IOW_READ_LINK)
+ socket |= EVENT_READ;
+ }
+
+ /*
+ * outgoing bcast buffer waiting to be sent?
+ */
+ if (flags & IOW_MBUF)
+ socket |= EVENT_WRITE;
+
+ /*
+ * Force wait on TUN input, even if also waiting on TCP/UDP output
+ */
+ if (flags & IOW_READ_TUN_FORCE)
+ tuntap |= EVENT_READ;
+
+ /*
+ * Configure event wait based on socket, tuntap flags.
+ */
+ socket_set (c->c2.link_socket, c->c2.event_set, socket, (void*)&socket_shift, NULL);
+ tun_set (c->c1.tuntap, c->c2.event_set, tuntap, (void*)&tun_shift, NULL);
+
+#ifdef ENABLE_MANAGEMENT
+ if (management)
+ management_socket_set (management, c->c2.event_set, (void*)&management_shift, NULL);
+#endif
+
+ /*
+ * Possible scenarios:
+ * (1) tcp/udp port has data available to read
+ * (2) tcp/udp port is ready to accept more data to write
+ * (3) tun dev has data available to read
+ * (4) tun dev is ready to accept more data to write
+ * (5) we received a signal (handler sets signal_received)
+ * (6) timeout (tv) expired
+ */
+
+ c->c2.event_set_status = ES_ERROR;
+
+ if (!c->sig->signal_received)
+ {
+ if (!(flags & IOW_CHECK_RESIDUAL) || !socket_read_residual (c->c2.link_socket))
+ {
+ int status;
+
+#ifdef ENABLE_DEBUG
+ if (check_debug_level (D_EVENT_WAIT))
+ show_wait_status (c);
+#endif
+
+ /*
+ * Wait for something to happen.
+ */
+ status = event_wait (c->c2.event_set, &c->c2.timeval, esr, SIZE(esr));
+
+ check_status (status, "event_wait", NULL, NULL);
+
+ if (status > 0)
+ {
+ int i;
+ c->c2.event_set_status = 0;
+ for (i = 0; i < status; ++i)
+ {
+ const struct event_set_return *e = &esr[i];
+ c->c2.event_set_status |= ((e->rwflags & 3) << *((int*)e->arg));
+ }
+ }
+ else if (status == 0)
+ {
+ c->c2.event_set_status = ES_TIMEOUT;
+ }
+ }
+ else
+ {
+ c->c2.event_set_status = SOCKET_READ;
+ }
+ }
+
+ /* 'now' should always be a reasonably up-to-date timestamp */
+ update_time ();
+
+ /* set signal_received if a signal was received */
+ if (c->c2.event_set_status & ES_ERROR)
+ get_signal (&c->sig->signal_received);
+
+ dmsg (D_EVENT_WAIT, "I/O WAIT status=0x%04x", c->c2.event_set_status);
+}
+
+void
+process_io (struct context *c)
+{
+ const unsigned int status = c->c2.event_set_status;
+
+#ifdef ENABLE_MANAGEMENT
+ if (status & (MANAGEMENT_READ|MANAGEMENT_WRITE))
+ {
+ ASSERT (management);
+ management_io (management);
+ }
+#endif
+
+ /* TCP/UDP port ready to accept write */
+ if (status & SOCKET_WRITE)
+ {
+ process_outgoing_link (c);
+ }
+ /* TUN device ready to accept write */
+ else if (status & TUN_WRITE)
+ {
+ process_outgoing_tun (c);
+ }
+ /* Incoming data on TCP/UDP port */
+ else if (status & SOCKET_READ)
+ {
+ read_incoming_link (c);
+ if (!IS_SIG (c))
+ process_incoming_link (c);
+ }
+ /* Incoming data on TUN device */
+ else if (status & TUN_READ)
+ {
+ read_incoming_tun (c);
+ if (!IS_SIG (c))
+ process_incoming_tun (c);
+ }
+}