2 process.c -- process management functions
3 Copyright (C) 1999-2005 Ivo Timmermans,
4 2000-2006 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
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #include "connection.h"
37 /* If zero, don't detach from the terminal. */
38 bool do_detach = true;
41 extern char *identname;
42 extern char *pidfilename;
44 extern bool use_logfile;
45 extern volatile bool running;
49 static int saved_debug_level = -1;
51 static void memory_full(int size)
53 logger(LOG_ERR, _("Memory exhausted (couldn't allocate %d bytes), exitting."), size);
58 /* Some functions the less gifted operating systems might lack... */
61 extern char *identname;
62 extern char *program_name;
65 static SC_HANDLE manager = NULL;
66 static SC_HANDLE service = NULL;
67 static SERVICE_STATUS status = {0};
68 static SERVICE_STATUS_HANDLE statushandle = 0;
70 bool install_service(void) {
71 char command[4096] = "\"";
74 SERVICE_DESCRIPTION description = {"Virtual Private Network daemon"};
76 manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
78 logger(LOG_ERR, _("Could not open service manager: %s"), winerror(GetLastError()));
82 if(!strchr(program_name, '\\')) {
83 GetCurrentDirectory(sizeof command - 1, command + 1);
84 strncat(command, "\\", sizeof command - strlen(command));
87 strncat(command, program_name, sizeof command - strlen(command));
89 strncat(command, "\"", sizeof command - strlen(command));
91 for(argp = g_argv + 1; *argp; argp++) {
92 space = strchr(*argp, ' ');
93 strncat(command, " ", sizeof command - strlen(command));
96 strncat(command, "\"", sizeof command - strlen(command));
98 strncat(command, *argp, sizeof command - strlen(command));
101 strncat(command, "\"", sizeof command - strlen(command));
104 service = CreateService(manager, identname, identname,
105 SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, SERVICE_ERROR_NORMAL,
106 command, NULL, NULL, NULL, NULL, NULL);
109 logger(LOG_ERR, _("Could not create %s service: %s"), identname, winerror(GetLastError()));
113 ChangeServiceConfig2(service, SERVICE_CONFIG_DESCRIPTION, &description);
115 logger(LOG_INFO, _("%s service installed"), identname);
117 if(!StartService(service, 0, NULL))
118 logger(LOG_WARNING, _("Could not start %s service: %s"), identname, winerror(GetLastError()));
120 logger(LOG_INFO, _("%s service started"), identname);
125 bool remove_service(void) {
126 manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
128 logger(LOG_ERR, _("Could not open service manager: %s"), winerror(GetLastError()));
132 service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
135 logger(LOG_ERR, _("Could not open %s service: %s"), identname, winerror(GetLastError()));
139 if(!ControlService(service, SERVICE_CONTROL_STOP, &status))
140 logger(LOG_ERR, _("Could not stop %s service: %s"), identname, winerror(GetLastError()));
142 logger(LOG_INFO, _("%s service stopped"), identname);
144 if(!DeleteService(service)) {
145 logger(LOG_ERR, _("Could not remove %s service: %s"), identname, winerror(GetLastError()));
149 logger(LOG_INFO, _("%s service removed"), identname);
154 DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID boe, LPVOID bah) {
156 case SERVICE_CONTROL_STOP:
157 logger(LOG_NOTICE, _("Got %s request"), "SERVICE_CONTROL_STOP");
159 case SERVICE_CONTROL_SHUTDOWN:
160 logger(LOG_NOTICE, _("Got %s request"), "SERVICE_CONTROL_SHUTDOWN");
163 logger(LOG_WARNING, _("Got unexpected request %d"), request);
164 return ERROR_CALL_NOT_IMPLEMENTED;
169 status.dwWaitHint = 30000;
170 status.dwCurrentState = SERVICE_STOP_PENDING;
171 SetServiceStatus(statushandle, &status);
174 status.dwWaitHint = 0;
175 status.dwCurrentState = SERVICE_STOPPED;
176 SetServiceStatus(statushandle, &status);
182 VOID WINAPI run_service(DWORD argc, LPTSTR* argv)
185 extern int main2(int argc, char **argv);
188 status.dwServiceType = SERVICE_WIN32;
189 status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
190 status.dwWin32ExitCode = 0;
191 status.dwServiceSpecificExitCode = 0;
192 status.dwCheckPoint = 0;
194 statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
197 logger(LOG_ERR, _("System call `%s' failed: %s"), "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
200 status.dwWaitHint = 30000;
201 status.dwCurrentState = SERVICE_START_PENDING;
202 SetServiceStatus(statushandle, &status);
204 status.dwWaitHint = 0;
205 status.dwCurrentState = SERVICE_RUNNING;
206 SetServiceStatus(statushandle, &status);
208 err = main2(argc, argv);
210 status.dwWaitHint = 0;
211 status.dwCurrentState = SERVICE_STOPPED;
212 //status.dwWin32ExitCode = err;
213 SetServiceStatus(statushandle, &status);
219 bool init_service(void) {
220 SERVICE_TABLE_ENTRY services[] = {
221 {identname, run_service},
225 if(!StartServiceCtrlDispatcher(services)) {
226 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
230 logger(LOG_ERR, _("System call `%s' failed: %s"), "StartServiceCtrlDispatcher", winerror(GetLastError()));
239 check for an existing tinc for this net, and write pid to pidfile
241 static bool write_pidfile(void)
247 pid = check_pid(pidfilename);
251 fprintf(stderr, _("A tincd is already running for net `%s' with pid %ld.\n"),
254 fprintf(stderr, _("A tincd is already running with pid %ld.\n"), (long)pid);
258 /* if it's locked, write-protected, or whatever */
259 if(!write_pid(pidfilename)) {
260 fprintf(stderr, _("Could write pid file %s: %s\n"), pidfilename, strerror(errno));
269 kill older tincd for this net
271 bool kill_other(int signal)
278 pid = read_pid(pidfilename);
282 fprintf(stderr, _("No other tincd is running for net `%s'.\n"),
285 fprintf(stderr, _("No other tincd is running.\n"));
289 errno = 0; /* No error, sometimes errno is only changed on error */
291 /* ESRCH is returned when no process with that pid is found */
292 if(kill(pid, signal) && errno == ESRCH) {
294 fprintf(stderr, _("The tincd for net `%s' is no longer running. "),
297 fprintf(stderr, _("The tincd is no longer running. "));
299 fprintf(stderr, _("Removing stale lock file.\n"));
300 remove_pid(pidfilename);
305 return remove_service();
310 Detach from current terminal, write pidfile, kill parent
318 /* First check if we can open a fresh new pidfile */
324 /* If we succeeded in doing that, detach */
332 fprintf(stderr, _("Couldn't detach from terminal: %s"),
337 /* Now UPDATE the pid in the pidfile, because we changed it... */
339 if(!write_pid(pidfilename)) {
340 fprintf(stderr, _("Could not write pid file %s: %s\n"), pidfilename, strerror(errno));
345 exit(install_service());
349 openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
351 logger(LOG_NOTICE, _("tincd %s (%s %s) starting, debug level %d"),
352 VERSION, __DATE__, __TIME__, debug_level);
354 xalloc_fail_func = memory_full;
359 bool execute_script(const char *name, char **envp)
364 char *scriptname, *p;
370 len = asprintf(&scriptname, "\"%s/%s\"", confbase, name);
372 len = asprintf(&scriptname, "\"%s/%s.bat\"", confbase, name);
377 scriptname[len - 1] = '\0';
379 /* First check if there is a script */
381 if(stat(scriptname + 1, &s)) {
386 ifdebug(STATUS) logger(LOG_INFO, _("Executing script %s"), name);
389 /* Set environment */
391 for(i = 0; envp[i]; i++)
395 scriptname[len - 1] = '\"';
396 status = system(scriptname);
400 /* Unset environment */
402 for(i = 0; envp[i]; i++) {
403 char *e = strchr(envp[i], '=');
405 p = alloca(e - envp[i] + 1);
406 strncpy(p, envp[i], e - envp[i]);
407 p[e - envp[i]] = '\0';
414 if(WIFEXITED(status)) { /* Child exited by itself */
415 if(WEXITSTATUS(status)) {
416 logger(LOG_ERR, _("Script %s exited with non-zero status %d"),
417 name, WEXITSTATUS(status));
420 } else if(WIFSIGNALED(status)) { /* Child was killed by a signal */
421 logger(LOG_ERR, _("Script %s was killed by signal %d (%s)"),
422 name, WTERMSIG(status), strsignal(WTERMSIG(status)));
424 } else { /* Something strange happened */
425 logger(LOG_ERR, _("Script %s terminated abnormally"), name);
429 logger(LOG_ERR, _("System call `%s' failed: %s"), "system", strerror(errno));
443 static RETSIGTYPE sigterm_handler(int a)
445 logger(LOG_NOTICE, _("Got %s signal"), "TERM");
452 static RETSIGTYPE sigquit_handler(int a)
454 logger(LOG_NOTICE, _("Got %s signal"), "QUIT");
461 static RETSIGTYPE fatal_signal_square(int a)
463 logger(LOG_ERR, _("Got another fatal signal %d (%s): not restarting."), a,
469 static RETSIGTYPE fatal_signal_handler(int a)
471 struct sigaction act;
472 logger(LOG_ERR, _("Got fatal signal %d (%s)"), a, strsignal(a));
476 logger(LOG_NOTICE, _("Trying to re-execute in 5 seconds..."));
478 act.sa_handler = fatal_signal_square;
479 act.sa_mask = emptysigset;
481 sigaction(SIGSEGV, &act, NULL);
483 close_network_connections();
485 remove_pid(pidfilename);
486 execvp(g_argv[0], g_argv);
488 logger(LOG_NOTICE, _("Not restarting."));
493 static RETSIGTYPE sigint_handler(int a)
495 logger(LOG_NOTICE, _("Got %s signal"), "INT");
497 if(saved_debug_level != -1) {
498 logger(LOG_NOTICE, _("Reverting to old debug level (%d)"),
500 debug_level = saved_debug_level;
501 saved_debug_level = -1;
504 _("Temporarily setting debug level to 5. Kill me with SIGINT again to go back to level %d."),
506 saved_debug_level = debug_level;
511 static RETSIGTYPE sigalrm_handler(int a)
513 logger(LOG_NOTICE, _("Got %s signal"), "ALRM");
517 static RETSIGTYPE sigusr1_handler(int a)
522 static RETSIGTYPE sigusr2_handler(int a)
530 static RETSIGTYPE sigwinch_handler(int a)
535 static RETSIGTYPE unexpected_signal_handler(int a)
537 logger(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a));
541 static RETSIGTYPE ignore_signal_handler(int a)
543 ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Ignored signal %d (%s)"), a, strsignal(a));
548 void (*handler)(int);
550 {SIGTERM, sigterm_handler},
551 {SIGQUIT, sigquit_handler},
552 {SIGSEGV, fatal_signal_handler},
553 {SIGBUS, fatal_signal_handler},
554 {SIGILL, fatal_signal_handler},
555 {SIGPIPE, ignore_signal_handler},
556 {SIGINT, sigint_handler},
557 {SIGUSR1, sigusr1_handler},
558 {SIGUSR2, sigusr2_handler},
559 {SIGCHLD, ignore_signal_handler},
560 {SIGALRM, sigalrm_handler},
561 {SIGWINCH, sigwinch_handler},
566 void setup_signals(void)
570 struct sigaction act;
572 sigemptyset(&emptysigset);
573 act.sa_handler = NULL;
574 act.sa_mask = emptysigset;
577 /* Set a default signal handler for every signal, errors will be
579 for(i = 0; i < NSIG; i++) {
581 act.sa_handler = SIG_DFL;
583 act.sa_handler = unexpected_signal_handler;
584 sigaction(i, &act, NULL);
587 /* If we didn't detach, allow coredumps */
589 sighandlers[2].handler = SIG_DFL;
591 /* Then, for each known signal that we want to catch, assign a
592 handler to the signal, with error checking this time. */
593 for(i = 0; sighandlers[i].signal; i++) {
594 act.sa_handler = sighandlers[i].handler;
595 if(sigaction(sighandlers[i].signal, &act, NULL) < 0)
596 fprintf(stderr, _("Installing signal handler for signal %d (%s) failed: %s\n"),
597 sighandlers[i].signal, strsignal(sighandlers[i].signal),