diff options
Diffstat (limited to 'openvpn.c')
| -rw-r--r-- | openvpn.c | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/openvpn.c b/openvpn.c new file mode 100644 index 0000000..47701f9 --- /dev/null +++ b/openvpn.c @@ -0,0 +1,242 @@ +/* + * 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) 2002-2005 OpenVPN Solutions LLC <info@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 WIN32 +#include "config-win32.h" +#else +#include "config.h" +#endif + +#include "syshead.h" + +#include "init.h" +#include "forward.h" +#include "multi.h" + +#include "memdbg.h" + +#include "forward-inline.h" + +#define P2P_CHECK_SIG() EVENT_LOOP_CHECK_SIGNAL (c, process_signal_p2p, c); + +static bool +process_signal_p2p (struct context *c) +{ + remap_signal (c); + return process_signal (c); +} + +static void +tunnel_point_to_point (struct context *c) +{ + context_clear_2 (c); + + /* set point-to-point mode */ + c->mode = CM_P2P; + + /* initialize tunnel instance */ + init_instance_handle_signals (c, c->es, CC_HARD_USR1_TO_HUP); + if (IS_SIG (c)) + return; + + init_management_callback_p2p (c); + + /* main event loop */ + while (true) + { + perf_push (PERF_EVENT_LOOP); + + /* process timers, TLS, etc. */ + pre_select (c); + P2P_CHECK_SIG(); + + /* set up and do the I/O wait */ + io_wait (c, p2p_iow_flags (c)); + P2P_CHECK_SIG(); + + /* timeout? */ + if (c->c2.event_set_status == ES_TIMEOUT) + { + perf_pop (); + continue; + } + + /* process the I/O which triggered select */ + process_io (c); + P2P_CHECK_SIG(); + + perf_pop (); + } + + uninit_management_callback (); + + /* tear down tunnel instance (unless --persist-tun) */ + close_instance (c); +} + +#undef PROCESS_SIGNAL_P2P + +int +main (int argc, char *argv[]) +{ + struct context c; + +#if PEDANTIC + fprintf (stderr, "Sorry, I was built with --enable-pedantic and I am incapable of doing any real work!\n"); + return 1; +#endif + + CLEAR (c); + + /* signify first time for components which can + only be initialized once per program instantiation. */ + c.first_time = true; + + /* initialize program-wide statics */ + if (init_static ()) + { + /* + * This loop is initially executed on startup and then + * once per SIGHUP. + */ + do + { + /* zero context struct but leave first_time member alone */ + context_clear_all_except_first_time (&c); + + /* static signal info object */ + CLEAR (siginfo_static); + c.sig = &siginfo_static; + + /* initialize garbage collector scoped to context object */ + gc_init (&c.gc); + + /* initialize environmental variable store */ + c.es = env_set_create (&c.gc); + +#ifdef ENABLE_MANAGEMENT + /* initialize management subsystem */ + init_management (&c); +#endif + + /* initialize options to default state */ + init_options (&c.options); + + /* parse command line options, and read configuration file */ + parse_argv (&c.options, argc, argv, M_USAGE, OPT_P_DEFAULT, NULL, c.es); + + /* init verbosity and mute levels */ + init_verb_mute (&c, IVM_LEVEL_1); + + /* set dev options */ + init_options_dev (&c.options); + + /* openssl print info? */ + if (print_openssl_info (&c.options)) + break; + + /* --genkey mode? */ + if (do_genkey (&c.options)) + break; + + /* tun/tap persist command? */ + if (do_persist_tuntap (&c.options)) + break; + + /* sanity check on options */ + options_postprocess (&c.options, c.first_time); + + /* show all option settings */ + show_settings (&c.options); + + /* print version number */ + msg (M_INFO, "%s", title_string); + + /* misc stuff */ + pre_setup (&c.options); + + /* test crypto? */ + if (do_test_crypto (&c.options)) + break; + +#ifdef ENABLE_MANAGEMENT + /* open management subsystem */ + if (!open_management (&c)) + break; +#endif + + /* set certain options as environmental variables */ + setenv_settings (c.es, &c.options); + + /* finish context init */ + context_init_1 (&c); + + do + { + /* run tunnel depending on mode */ + switch (c.options.mode) + { + case MODE_POINT_TO_POINT: + tunnel_point_to_point (&c); + break; +#if P2MP_SERVER + case MODE_SERVER: + tunnel_server (&c); + break; +#endif + default: + ASSERT (0); + } + + /* indicates first iteration -- has program-wide scope */ + c.first_time = false; + + /* any signals received? */ + if (IS_SIG (&c)) + print_signal (c.sig, NULL, M_INFO); + + /* pass restart status to management subsystem */ + signal_restart_status (c.sig); + } + while (c.sig->signal_received == SIGUSR1); + + uninit_options (&c.options); + gc_reset (&c.gc); + } + while (c.sig->signal_received == SIGHUP); + } + + context_gc_free (&c); + +#ifdef ENABLE_MANAGEMENT + /* close management interface */ + close_management (); +#endif + + /* uninitialize program-wide statics */ + uninit_static (); + + openvpn_exit (OPENVPN_EXIT_STATUS_GOOD); /* exit point */ + return 0; /* NOTREACHED */ +} |