/* tincd.c -- the main file for tincd Copyright (C) 1998,1999,2000 Ivo Timmermans 2000 Guus Sliepen This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. 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; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. $Id: tincd.c,v 1.10.4.5 2000/06/29 19:47:04 guus Exp $ */ #include "config.h" #include #include #include #include #include #include #include #include #ifdef HAVE_SYS_IOCTL_H # include #endif #include #include #include #include "conf.h" #include "encr.h" #include "net.h" #include "netutl.h" #include "system.h" /* The name this program was run with. */ char *program_name; /* If nonzero, display usage information and exit. */ static int show_help; /* If nonzero, print the version on standard output and exit. */ static int show_version; /* If nonzero, it will attempt to kill a running tincd and exit. */ static int kill_tincd = 0; /* If zero, don't detach from the terminal. */ static int do_detach = 1; char *confbase = NULL; /* directory in which all config files are */ /* char *configfilename = NULL; /* configuration file name, moved to config.c */ char *identname; /* program name for syslog */ char *netname = NULL; /* name of the vpn network */ char *pidfilename; /* pid file location */ static pid_t ppid; /* pid of non-detached part */ char **g_argv; /* a copy of the cmdline arguments */ void cleanup_and_exit(int); int detach(void); int kill_other(void); void make_names(void); RETSIGTYPE parent_exit(int a); void setup_signals(void); int write_pidfile(void); static struct option const long_options[] = { { "kill", no_argument, NULL, 'k' }, { "net", required_argument, NULL, 'n' }, { "timeout", required_argument, NULL, 'p' }, { "help", no_argument, &show_help, 1 }, { "version", no_argument, &show_version, 1 }, { "no-detach", no_argument, &do_detach, 0 }, { NULL, 0, NULL, 0 } }; static void usage(int status) { if(status != 0) fprintf(stderr, _("Try `%s --help\' for more information.\n"), program_name); else { printf(_("Usage: %s [option]...\n\n"), program_name); printf(_(" -c, --config=FILE Read configuration options from FILE.\n" " -D, --no-detach Don't fork and detach.\n" " -d Increase debug level.\n" " -k, --kill Attempt to kill a running tincd and exit.\n" " -n, --net=NETNAME Connect to net NETNAME.\n" " -t, --timeout=TIMEOUT Seconds to wait before giving a timeout.\n")); printf(_(" --help Display this help and exit.\n" " --version Output version information and exit.\n\n")); printf(_("Report bugs to tinc@nl.linux.org.\n")); } exit(status); } void parse_options(int argc, char **argv, char **envp) { int r; int option_index = 0; config_t *p; while((r = getopt_long(argc, argv, "c:Ddkn:t:", long_options, &option_index)) != EOF) { switch(r) { case 0: /* long option */ break; case 'c': /* config file */ configfilename = xmalloc(strlen(optarg)+1); strcpy(configfilename, optarg); break; case 'D': /* no detach */ do_detach = 0; break; case 'd': /* inc debug level */ debug_lvl++; break; case 'k': /* kill old tincds */ kill_tincd = 1; break; case 'n': /* net name given */ netname = xmalloc(strlen(optarg)+1); strcpy(netname, optarg); break; case 't': /* timeout */ if(!(p = add_config_val(&config, TYPE_INT, optarg))) { printf(_("Invalid timeout value `%s'.\n"), optarg); usage(1); } break; case '?': usage(1); default: break; } } } void memory_full(int size) { syslog(LOG_ERR, _("Memory exhausted (last is %s:%d) (couldn't allocate %d bytes), exiting."), cp_file, cp_line, size); exit(1); } /* Detach from current terminal, write pidfile, kill parent */ int detach(void) { int fd; pid_t pid; if(do_detach) { ppid = getpid(); if((pid = fork()) < 0) { perror("fork"); return -1; } if(pid) /* parent process */ { signal(SIGTERM, parent_exit); sleep(600); /* wait 10 minutes */ exit(1); } } if(write_pidfile()) return -1; if(do_detach) { if((fd = open("/dev/tty", O_RDWR)) >= 0) { if(ioctl(fd, TIOCNOTTY, NULL)) { perror("ioctl"); return -1; } close(fd); } if(setsid() < 0) return -1; kill(ppid, SIGTERM); } chdir("/"); /* avoid keeping a mointpoint busy */ openlog(identname, LOG_CONS | LOG_PID, LOG_DAEMON); if(debug_lvl > 0) syslog(LOG_NOTICE, _("tincd %s (%s %s) starting, debug level %d"), VERSION, __DATE__, __TIME__, debug_lvl); else syslog(LOG_NOTICE, _("tincd %s starting"), VERSION, debug_lvl); xalloc_fail_func = memory_full; return 0; } /* Close network connections, and terminate neatly */ void cleanup_and_exit(int c) { close_network_connections(); if(debug_lvl > 0) syslog(LOG_INFO, _("Total bytes written: tap %d, socket %d; bytes read: tap %d, socket %d"), total_tap_out, total_socket_out, total_tap_in, total_socket_in); closelog(); kill(ppid, SIGTERM); exit(c); } /* check for an existing tinc for this net, and write pid to pidfile */ int write_pidfile(void) { int pid; if((pid = check_pid(pidfilename))) { if(netname) fprintf(stderr, _("A tincd is already running for net `%s' with pid %d.\n"), netname, pid); else fprintf(stderr, _("A tincd is already running with pid %d.\n"), pid); return 1; } /* if it's locked, write-protected, or whatever */ if(!write_pid(pidfilename)) return 1; return 0; } /* kill older tincd for this net */ int kill_other(void) { int pid; if(!(pid = read_pid(pidfilename))) { if(netname) fprintf(stderr, _("No other tincd is running for net `%s'.\n"), netname); else fprintf(stderr, _("No other tincd is running.\n")); return 1; } errno = 0; /* No error, sometimes errno is only changed on error */ /* ESRCH is returned when no process with that pid is found */ if(kill(pid, SIGTERM) && errno == ESRCH) fprintf(stderr, _("Removing stale lock file.\n")); remove_pid(pidfilename); return 0; } /* Set all files and paths according to netname */ void make_names(void) { if(!configfilename) { if(netname) { configfilename = xmalloc(strlen(netname)+18+strlen(CONFDIR)); sprintf(configfilename, "%s/tinc/%s/tinc.conf", CONFDIR, netname); } else { configfilename = xmalloc(17+strlen(CONFDIR)); sprintf(configfilename, "%s/tinc/tinc.conf", CONFDIR); } } if(netname) { pidfilename = xmalloc(strlen(netname)+20); sprintf(pidfilename, "/var/run/tinc.%s.pid", netname); confbase = xmalloc(strlen(netname)+8+strlen(CONFDIR)); sprintf(confbase, "%s/tinc/%s/", CONFDIR, netname); identname = xmalloc(strlen(netname)+7); sprintf(identname, "tinc.%s", netname); } else { pidfilename = "/var/run/tinc.pid"; confbase = xmalloc(7+strlen(CONFDIR)); sprintf(confbase, "%s/tinc/", CONFDIR); identname = "tinc"; } } int main(int argc, char **argv, char **envp) { program_name = argv[0]; setlocale (LC_ALL, ""); bindtextdomain (PACKAGE, LOCALEDIR); textdomain (PACKAGE); parse_options(argc, argv, envp); if(show_version) { printf(_("%s version %s\n"), PACKAGE, VERSION); printf(_("Copyright (C) 1998,1999,2000 Ivo Timmermans and others,\n" "see the AUTHORS file for a complete list.\n\n" "tinc comes with ABSOLUTELY NO WARRANTY. This is free software,\n" "and you are welcome to redistribute it under certain conditions;\n" "see the file COPYING for details.\n\n")); printf(_("This product includes software developed by Eric Young (eay@mincom.oz.au)\n")); return 0; } if(show_help) usage(0); if(geteuid()) { fprintf(stderr, _("You must be root to run this program. Sorry.\n")); return 1; } g_argv = argv; make_names(); if(kill_tincd) exit(kill_other()); if(read_config_file(configfilename)) return 1; setup_signals(); if(detach()) exit(0); if(security_init()) return 1; if(setup_network_connections()) cleanup_and_exit(1); main_loop(); cleanup_and_exit(1); return 1; } RETSIGTYPE sigterm_handler(int a) { if(debug_lvl > 0) syslog(LOG_NOTICE, _("Got TERM signal")); cleanup_and_exit(0); } RETSIGTYPE sigquit_handler(int a) { if(debug_lvl > 0) syslog(LOG_NOTICE, _("Got QUIT signal")); cleanup_and_exit(0); } RETSIGTYPE sigsegv_square(int a) { syslog(LOG_NOTICE, _("Got another SEGV signal: not restarting")); exit(0); } RETSIGTYPE sigsegv_handler(int a) { if(cp_file) syslog(LOG_NOTICE, _("Got SEGV signal after %s line %d, trying to re-execute"), cp_file, cp_line); else syslog(LOG_NOTICE, _("Got SEGV signal, trying to re-execute")); signal(SIGSEGV, sigsegv_square); close_network_connections(); remove_pid(pidfilename); execvp(g_argv[0], g_argv); } RETSIGTYPE sighup_handler(int a) { if(debug_lvl > 0) syslog(LOG_NOTICE, _("Got HUP signal, rereading configuration and restarting")); sighup = 1; } RETSIGTYPE sigint_handler(int a) { if(debug_lvl > 0) syslog(LOG_NOTICE, _("Got INT signal, exitting")); cleanup_and_exit(0); } RETSIGTYPE sigusr1_handler(int a) { dump_conn_list(); } RETSIGTYPE sigusr2_handler(int a) { if(debug_lvl > 1) syslog(LOG_NOTICE, _("Got USR2 signal, forcing new key generation")); regenerate_keys(); } RETSIGTYPE sighuh(int a) { if(cp_file) syslog(LOG_NOTICE, _("Got unexpected signal %d after %s line %d"), a, cp_file, cp_line); else syslog(LOG_NOTICE, _("Got unexpected signal %d"), a); } void setup_signals(void) { int i; for(i=0;i<32;i++) signal(i,sighuh); if(signal(SIGTERM, SIG_IGN) != SIG_ERR) signal(SIGTERM, sigterm_handler); if(signal(SIGQUIT, SIG_IGN) != SIG_ERR) signal(SIGQUIT, sigquit_handler); if(signal(SIGSEGV, SIG_IGN) != SIG_ERR) signal(SIGSEGV, sigsegv_handler); if(signal(SIGHUP, SIG_IGN) != SIG_ERR) signal(SIGHUP, sighup_handler); signal(SIGPIPE, SIG_IGN); if(signal(SIGINT, SIG_IGN) != SIG_ERR) signal(SIGINT, sigint_handler); signal(SIGUSR1, sigusr1_handler); signal(SIGUSR2, sigusr2_handler); // signal(SIGCHLD, parent_exit); } RETSIGTYPE parent_exit(int a) { exit(0); }