2 process.c -- process management functions
3 Copyright (C) 1999-2005 Ivo Timmermans,
4 2000-2009 Guus Sliepen <guus@tinc-vpn.org>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License along
17 with this program; if not, write to the Free Software Foundation, Inc.,
18 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
24 #include "connection.h"
35 /* If zero, don't detach from the terminal. */
36 bool do_detach = true;
40 extern char *identname;
41 extern char *pidfilename;
43 extern bool use_logfile;
44 extern volatile bool running;
48 static int saved_debug_level = -1;
50 static void memory_full(int size) {
51 logger(LOG_ERR, "Memory exhausted (couldn't allocate %d bytes), exitting.", size);
55 /* Some functions the less gifted operating systems might lack... */
58 extern char *identname;
59 extern char *program_name;
62 static SC_HANDLE manager = NULL;
63 static SC_HANDLE service = NULL;
64 static SERVICE_STATUS status = {0};
65 static SERVICE_STATUS_HANDLE statushandle = 0;
67 bool install_service(void) {
68 char command[4096] = "\"";
71 SERVICE_DESCRIPTION description = {"Virtual Private Network daemon"};
73 manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
75 logger(LOG_ERR, "Could not open service manager: %s", winerror(GetLastError()));
79 if(!strchr(program_name, '\\')) {
80 GetCurrentDirectory(sizeof command - 1, command + 1);
81 strncat(command, "\\", sizeof command - strlen(command));
84 strncat(command, program_name, sizeof command - strlen(command));
86 strncat(command, "\"", sizeof command - strlen(command));
88 for(argp = g_argv + 1; *argp; argp++) {
89 space = strchr(*argp, ' ');
90 strncat(command, " ", sizeof command - strlen(command));
93 strncat(command, "\"", sizeof command - strlen(command));
95 strncat(command, *argp, sizeof command - strlen(command));
98 strncat(command, "\"", sizeof command - strlen(command));
101 service = CreateService(manager, identname, identname,
102 SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, SERVICE_ERROR_NORMAL,
103 command, NULL, NULL, NULL, NULL, NULL);
106 DWORD lasterror = GetLastError();
107 logger(LOG_ERR, "Could not create %s service: %s", identname, winerror(lasterror));
108 if(lasterror != ERROR_SERVICE_EXISTS)
113 ChangeServiceConfig2(service, SERVICE_CONFIG_DESCRIPTION, &description);
114 logger(LOG_INFO, "%s service installed", identname);
116 service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
119 if(!StartService(service, 0, NULL))
120 logger(LOG_WARNING, "Could not start %s service: %s", identname, winerror(GetLastError()));
122 logger(LOG_INFO, "%s service started", identname);
127 bool remove_service(void) {
128 manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
130 logger(LOG_ERR, "Could not open service manager: %s", winerror(GetLastError()));
134 service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
137 logger(LOG_ERR, "Could not open %s service: %s", identname, winerror(GetLastError()));
141 if(!ControlService(service, SERVICE_CONTROL_STOP, &status))
142 logger(LOG_ERR, "Could not stop %s service: %s", identname, winerror(GetLastError()));
144 logger(LOG_INFO, "%s service stopped", identname);
146 if(!DeleteService(service)) {
147 logger(LOG_ERR, "Could not remove %s service: %s", identname, winerror(GetLastError()));
151 logger(LOG_INFO, "%s service removed", identname);
156 DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID boe, LPVOID bah) {
158 case SERVICE_CONTROL_INTERROGATE:
159 SetServiceStatus(statushandle, &status);
161 case SERVICE_CONTROL_STOP:
162 logger(LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_STOP");
164 case SERVICE_CONTROL_SHUTDOWN:
165 logger(LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_SHUTDOWN");
168 logger(LOG_WARNING, "Got unexpected request %d", request);
169 return ERROR_CALL_NOT_IMPLEMENTED;
174 status.dwWaitHint = 30000;
175 status.dwCurrentState = SERVICE_STOP_PENDING;
176 SetServiceStatus(statushandle, &status);
179 status.dwWaitHint = 0;
180 status.dwCurrentState = SERVICE_STOPPED;
181 SetServiceStatus(statushandle, &status);
187 VOID WINAPI run_service(DWORD argc, LPTSTR* argv) {
189 extern int main2(int argc, char **argv);
192 status.dwServiceType = SERVICE_WIN32;
193 status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
194 status.dwWin32ExitCode = 0;
195 status.dwServiceSpecificExitCode = 0;
196 status.dwCheckPoint = 0;
198 statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
201 logger(LOG_ERR, "System call `%s' failed: %s", "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
204 status.dwWaitHint = 30000;
205 status.dwCurrentState = SERVICE_START_PENDING;
206 SetServiceStatus(statushandle, &status);
208 status.dwWaitHint = 0;
209 status.dwCurrentState = SERVICE_RUNNING;
210 SetServiceStatus(statushandle, &status);
212 err = main2(argc, argv);
214 status.dwWaitHint = 0;
215 status.dwCurrentState = SERVICE_STOPPED;
216 //status.dwWin32ExitCode = err;
217 SetServiceStatus(statushandle, &status);
223 bool init_service(void) {
224 SERVICE_TABLE_ENTRY services[] = {
225 {identname, run_service},
229 if(!StartServiceCtrlDispatcher(services)) {
230 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
234 logger(LOG_ERR, "System call `%s' failed: %s", "StartServiceCtrlDispatcher", winerror(GetLastError()));
243 check for an existing tinc for this net, and write pid to pidfile
245 static bool write_pidfile(void) {
248 pid = check_pid(pidfilename);
252 fprintf(stderr, "A tincd is already running for net `%s' with pid %ld.\n",
255 fprintf(stderr, "A tincd is already running with pid %ld.\n", (long)pid);
259 /* if it's locked, write-protected, or whatever */
260 if(!write_pid(pidfilename)) {
261 fprintf(stderr, "Could write pid file %s: %s\n", pidfilename, strerror(errno));
270 kill older tincd for this net
272 bool kill_other(int signal) {
276 pid = read_pid(pidfilename);
280 fprintf(stderr, "No other tincd is running for net `%s'.\n",
283 fprintf(stderr, "No other tincd is running.\n");
287 errno = 0; /* No error, sometimes errno is only changed on error */
289 /* ESRCH is returned when no process with that pid is found */
290 if(kill(pid, signal) && errno == ESRCH) {
292 fprintf(stderr, "The tincd for net `%s' is no longer running. ",
295 fprintf(stderr, "The tincd is no longer running. ");
297 fprintf(stderr, "Removing stale lock file.\n");
298 remove_pid(pidfilename);
303 return remove_service();
308 Detach from current terminal, write pidfile, kill parent
313 /* First check if we can open a fresh new pidfile */
319 /* If we succeeded in doing that, detach */
327 fprintf(stderr, "Couldn't detach from terminal: %s",
332 /* Now UPDATE the pid in the pidfile, because we changed it... */
334 if(!write_pid(pidfilename)) {
335 fprintf(stderr, "Could not write pid file %s: %s\n", pidfilename, strerror(errno));
340 exit(install_service());
344 openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
346 logger(LOG_NOTICE, "tincd %s (%s %s) starting, debug level %d",
347 VERSION, __DATE__, __TIME__, debug_level);
349 xalloc_fail_func = memory_full;
354 bool execute_script(const char *name, char **envp) {
357 char *scriptname, *p;
361 len = xasprintf(&scriptname, "\"%s/%s\"", confbase, name);
363 len = xasprintf(&scriptname, "\"%s/%s.bat\"", confbase, name);
368 scriptname[len - 1] = '\0';
371 /* First check if there is a script */
373 if(access(scriptname + 1, F_OK)) {
379 ifdebug(STATUS) logger(LOG_INFO, "Executing script %s", name);
382 /* Set environment */
384 for(i = 0; envp[i]; i++)
388 scriptname[len - 1] = '\"';
389 status = system(scriptname);
393 /* Unset environment */
395 for(i = 0; envp[i]; i++) {
396 char *e = strchr(envp[i], '=');
398 p = alloca(e - envp[i] + 1);
399 strncpy(p, envp[i], e - envp[i]);
400 p[e - envp[i]] = '\0';
407 if(WIFEXITED(status)) { /* Child exited by itself */
408 if(WEXITSTATUS(status)) {
409 logger(LOG_ERR, "Script %s exited with non-zero status %d",
410 name, WEXITSTATUS(status));
413 } else if(WIFSIGNALED(status)) { /* Child was killed by a signal */
414 logger(LOG_ERR, "Script %s was killed by signal %d (%s)",
415 name, WTERMSIG(status), strsignal(WTERMSIG(status)));
417 } else { /* Something strange happened */
418 logger(LOG_ERR, "Script %s terminated abnormally", name);
422 logger(LOG_ERR, "System call `%s' failed: %s", "system", strerror(errno));
436 static RETSIGTYPE sigterm_handler(int a) {
437 logger(LOG_NOTICE, "Got %s signal", "TERM");
444 static RETSIGTYPE sigquit_handler(int a) {
445 logger(LOG_NOTICE, "Got %s signal", "QUIT");
452 static RETSIGTYPE fatal_signal_square(int a) {
453 logger(LOG_ERR, "Got another fatal signal %d (%s): not restarting.", a,
458 static RETSIGTYPE fatal_signal_handler(int a) {
459 struct sigaction act;
460 logger(LOG_ERR, "Got fatal signal %d (%s)", a, strsignal(a));
463 logger(LOG_NOTICE, "Trying to re-execute in 5 seconds...");
465 act.sa_handler = fatal_signal_square;
466 act.sa_mask = emptysigset;
468 sigaction(SIGSEGV, &act, NULL);
470 close_network_connections();
472 remove_pid(pidfilename);
473 execvp(g_argv[0], g_argv);
475 logger(LOG_NOTICE, "Not restarting.");
480 static RETSIGTYPE sighup_handler(int a) {
481 logger(LOG_NOTICE, "Got %s signal", "HUP");
485 static RETSIGTYPE sigint_handler(int a) {
486 logger(LOG_NOTICE, "Got %s signal", "INT");
488 if(saved_debug_level != -1) {
489 logger(LOG_NOTICE, "Reverting to old debug level (%d)",
491 debug_level = saved_debug_level;
492 saved_debug_level = -1;
495 "Temporarily setting debug level to 5. Kill me with SIGINT again to go back to level %d.",
497 saved_debug_level = debug_level;
502 static RETSIGTYPE sigalrm_handler(int a) {
503 logger(LOG_NOTICE, "Got %s signal", "ALRM");
507 static RETSIGTYPE sigusr1_handler(int a) {
511 static RETSIGTYPE sigusr2_handler(int a) {
518 static RETSIGTYPE sigwinch_handler(int a) {
522 static RETSIGTYPE unexpected_signal_handler(int a) {
523 logger(LOG_WARNING, "Got unexpected signal %d (%s)", a, strsignal(a));
526 static RETSIGTYPE ignore_signal_handler(int a) {
527 ifdebug(SCARY_THINGS) logger(LOG_DEBUG, "Ignored signal %d (%s)", a, strsignal(a));
532 void (*handler)(int);
534 {SIGHUP, sighup_handler},
535 {SIGTERM, sigterm_handler},
536 {SIGQUIT, sigquit_handler},
537 {SIGSEGV, fatal_signal_handler},
538 {SIGBUS, fatal_signal_handler},
539 {SIGILL, fatal_signal_handler},
540 {SIGPIPE, ignore_signal_handler},
541 {SIGINT, sigint_handler},
542 {SIGUSR1, sigusr1_handler},
543 {SIGUSR2, sigusr2_handler},
544 {SIGCHLD, ignore_signal_handler},
545 {SIGALRM, sigalrm_handler},
546 {SIGWINCH, sigwinch_handler},
551 void setup_signals(void) {
554 struct sigaction act;
556 sigemptyset(&emptysigset);
557 act.sa_handler = NULL;
558 act.sa_mask = emptysigset;
561 /* Set a default signal handler for every signal, errors will be
563 for(i = 1; i < NSIG; i++) {
565 act.sa_handler = SIG_DFL;
567 act.sa_handler = unexpected_signal_handler;
568 sigaction(i, &act, NULL);
571 /* If we didn't detach, allow coredumps */
573 sighandlers[3].handler = SIG_DFL;
575 /* Then, for each known signal that we want to catch, assign a
576 handler to the signal, with error checking this time. */
577 for(i = 0; sighandlers[i].signal; i++) {
578 act.sa_handler = sighandlers[i].handler;
579 if(sigaction(sighandlers[i].signal, &act, NULL) < 0)
580 fprintf(stderr, "Installing signal handler for signal %d (%s) failed: %s\n",
581 sighandlers[i].signal, strsignal(sighandlers[i].signal),