2 process.c -- process management functions
3 Copyright (C) 1999-2003 Ivo Timmermans <ivo@o2w.nl>,
4 2000-2003 Guus Sliepen <guus@sliepen.eu.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.
20 $Id: process.c,v 1.1.2.67 2003/08/08 19:43:47 guus Exp $
26 #include "connection.h"
37 /* If zero, don't detach from the terminal. */
38 bool do_detach = true;
42 extern char *identname;
43 extern char *pidfilename;
45 extern bool use_logfile;
46 extern volatile bool running;
50 static int saved_debug_level = -1;
52 static void memory_full(int size)
54 logger(LOG_ERR, _("Memory exhausted (couldn't allocate %d bytes), exitting."), size);
59 /* Some functions the less gifted operating systems might lack... */
61 #ifndef HAVE_FCLOSEALL
62 static int fcloseall(void)
75 extern char *identname;
76 extern char *program_name;
79 static SC_HANDLE manager = NULL;
80 static SC_HANDLE service = NULL;
81 static SERVICE_STATUS status = {0};
82 static SERVICE_STATUS_HANDLE statushandle = 0;
84 bool install_service(void) {
85 char command[4096] = "";
89 manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
91 logger(LOG_ERR, _("Could not open service manager: %s"), winerror(GetLastError()));
95 if(!strchr(program_name, '\\')) {
96 GetCurrentDirectory(sizeof(command), command);
97 strncat(command, "\\", sizeof(command));
100 strncat(command, program_name, sizeof(command));
101 for(argp = g_argv + 1; *argp; argp++) {
102 space = strchr(*argp, ' ');
103 strncat(command, space?" \"":" ", sizeof(command));
104 strncat(command, *argp, sizeof(command));
106 strncat(command, "\"", sizeof(command));
109 service = CreateService(manager, identname, identname,
110 SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, SERVICE_ERROR_NORMAL,
111 command, "NDIS", NULL, NULL, NULL, NULL);
114 logger(LOG_ERR, _("Could not create %s service: %s"), identname, winerror(GetLastError()));
118 logger(LOG_INFO, _("%s service installed"), identname);
120 if(!StartService(service, 0, NULL))
121 logger(LOG_WARNING, _("Could not start %s service: %s"), identname, winerror(GetLastError()));
123 logger(LOG_INFO, _("%s service started"), identname);
128 bool remove_service(void) {
129 manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
131 logger(LOG_ERR, _("Could not open service manager: %s"), winerror(GetLastError()));
135 service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
138 logger(LOG_ERR, _("Could not open %s service: %s"), identname, winerror(GetLastError()));
142 if(!ControlService(service, SERVICE_CONTROL_STOP, &status))
143 logger(LOG_ERR, _("Could not stop %s service: %s"), identname, winerror(GetLastError()));
145 logger(LOG_INFO, _("%s service stopped"), identname);
147 if(!DeleteService(service)) {
148 logger(LOG_ERR, _("Could not remove %s service: %s"), identname, winerror(GetLastError()));
152 logger(LOG_INFO, _("%s service removed"), identname);
157 DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID boe, LPVOID bah) {
159 case SERVICE_CONTROL_STOP:
160 logger(LOG_NOTICE, _("Got %s request"), "SERVICE_CONTROL_STOP");
163 case SERVICE_CONTROL_SHUTDOWN:
164 logger(LOG_NOTICE, _("Got %s request"), "SERVICE_CONTROL_SHUTDOWN");
168 logger(LOG_WARNING, _("Got unexpected request %d"), request);
169 return ERROR_CALL_NOT_IMPLEMENTED;
173 status.dwWaitHint = 30000;
174 status.dwCurrentState = SERVICE_STOP_PENDING;
175 SetServiceStatus(statushandle, &status);
181 VOID WINAPI run_service(DWORD argc, LPTSTR* argv)
184 extern int main2(int argc, char **argv);
187 status.dwServiceType = SERVICE_WIN32;
188 status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
189 status.dwWin32ExitCode = 0;
190 status.dwServiceSpecificExitCode = 0;
191 status.dwCheckPoint = 0;
193 statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
196 logger(LOG_ERR, _("System call `%s' failed: %s"), "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
199 status.dwWaitHint = 30000;
200 status.dwCurrentState = SERVICE_START_PENDING;
201 SetServiceStatus(statushandle, &status);
203 status.dwWaitHint = 0;
204 status.dwCurrentState = SERVICE_RUNNING;
205 SetServiceStatus(statushandle, &status);
207 err = main2(argc, argv);
209 status.dwWaitHint = 0;
210 status.dwCurrentState = SERVICE_STOPPED;
211 //status.dwWin32ExitCode = err;
212 SetServiceStatus(statushandle, &status);
218 bool init_service(void) {
219 SERVICE_TABLE_ENTRY services[] = {
220 {identname, run_service},
224 if(!StartServiceCtrlDispatcher(services)) {
225 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
229 logger(LOG_ERR, _("System call `%s' failed: %s"), "StartServiceCtrlDispatcher", winerror(GetLastError()));
238 check for an existing tinc for this net, and write pid to pidfile
240 static bool write_pidfile(void)
246 pid = check_pid(pidfilename);
250 fprintf(stderr, _("A tincd is already running for net `%s' with pid %d.\n"),
253 fprintf(stderr, _("A tincd is already running with pid %d.\n"), pid);
257 /* if it's locked, write-protected, or whatever */
258 if(!write_pid(pidfilename))
266 kill older tincd for this net
268 bool kill_other(int signal)
275 pid = read_pid(pidfilename);
279 fprintf(stderr, _("No other tincd is running for net `%s'.\n"),
282 fprintf(stderr, _("No other tincd is running.\n"));
286 errno = 0; /* No error, sometimes errno is only changed on error */
288 /* ESRCH is returned when no process with that pid is found */
289 if(kill(pid, signal) && errno == ESRCH) {
291 fprintf(stderr, _("The tincd for net `%s' is no longer running. "),
294 fprintf(stderr, _("The tincd is no longer running. "));
296 fprintf(stderr, _("Removing stale lock file.\n"));
297 remove_pid(pidfilename);
302 return remove_service();
307 Detach from current terminal, write pidfile, kill parent
315 /* First check if we can open a fresh new pidfile */
321 /* If we succeeded in doing that, detach */
329 fprintf(stderr, _("Couldn't detach from terminal: %s"),
334 /* Now UPDATE the pid in the pidfile, because we changed it... */
336 if(!write_pid(pidfilename))
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)
364 asprintf(&scriptname, "\"%s/%s\"", confbase, name);
367 /* First check if there is a script */
369 if(stat(scriptname, &s))
372 ifdebug(STATUS) logger(LOG_INFO, _("Executing script %s"), name);
375 /* Set environment */
380 status = system(scriptname);
384 /* Unset environment? */
388 if(WIFEXITED(status)) { /* Child exited by itself */
389 if(WEXITSTATUS(status)) {
390 logger(LOG_ERR, _("Process %d (%s) exited with non-zero status %d"),
391 pid, name, WEXITSTATUS(status));
394 } else if(WIFSIGNALED(status)) { /* Child was killed by a signal */
395 logger(LOG_ERR, _("Process %d (%s) was killed by signal %d (%s)"), pid,
396 name, WTERMSIG(status), strsignal(WTERMSIG(status)));
398 } else { /* Something strange happened */
399 logger(LOG_ERR, _("Process %d (%s) terminated abnormally"), pid,
404 logger(LOG_ERR, _("System call `%s' failed: %s"), "system",
419 static RETSIGTYPE sigterm_handler(int a)
421 logger(LOG_NOTICE, _("Got %s signal"), "TERM");
425 static RETSIGTYPE sigquit_handler(int a)
427 logger(LOG_NOTICE, _("Got %s signal"), "QUIT");
431 static RETSIGTYPE fatal_signal_square(int a)
433 logger(LOG_ERR, _("Got another fatal signal %d (%s): not restarting."), a,
439 static RETSIGTYPE fatal_signal_handler(int a)
441 struct sigaction act;
442 logger(LOG_ERR, _("Got fatal signal %d (%s)"), a, strsignal(a));
446 logger(LOG_NOTICE, _("Trying to re-execute in 5 seconds..."));
448 act.sa_handler = fatal_signal_square;
449 act.sa_mask = emptysigset;
451 sigaction(SIGSEGV, &act, NULL);
453 close_network_connections();
455 remove_pid(pidfilename);
456 execvp(g_argv[0], g_argv);
458 logger(LOG_NOTICE, _("Not restarting."));
463 static RETSIGTYPE sighup_handler(int a)
465 logger(LOG_NOTICE, _("Got %s signal"), "HUP");
469 static RETSIGTYPE sigint_handler(int a)
471 logger(LOG_NOTICE, _("Got %s signal"), "INT");
473 if(saved_debug_level != -1) {
474 logger(LOG_NOTICE, _("Reverting to old debug level (%d)"),
476 debug_level = saved_debug_level;
477 saved_debug_level = -1;
480 _("Temporarily setting debug level to 5. Kill me with SIGINT again to go back to level %d."),
482 saved_debug_level = debug_level;
487 static RETSIGTYPE sigalrm_handler(int a)
489 logger(LOG_NOTICE, _("Got %s signal"), "ALRM");
493 static RETSIGTYPE sigusr1_handler(int a)
498 static RETSIGTYPE sigusr2_handler(int a)
506 static RETSIGTYPE sigwinch_handler(int a)
511 static RETSIGTYPE unexpected_signal_handler(int a)
513 logger(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a));
517 static RETSIGTYPE ignore_signal_handler(int a)
519 ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Ignored signal %d (%s)"), a, strsignal(a));
524 void (*handler)(int);
526 {SIGHUP, sighup_handler},
527 {SIGTERM, sigterm_handler},
528 {SIGQUIT, sigquit_handler},
529 {SIGSEGV, fatal_signal_handler},
530 {SIGBUS, fatal_signal_handler},
531 {SIGILL, fatal_signal_handler},
532 {SIGPIPE, ignore_signal_handler},
533 {SIGINT, sigint_handler},
534 {SIGUSR1, sigusr1_handler},
535 {SIGUSR2, sigusr2_handler},
536 {SIGCHLD, ignore_signal_handler},
537 {SIGALRM, sigalrm_handler},
538 {SIGWINCH, sigwinch_handler},
543 void setup_signals(void)
547 struct sigaction act;
549 sigemptyset(&emptysigset);
550 act.sa_handler = NULL;
551 act.sa_mask = emptysigset;
554 /* Set a default signal handler for every signal, errors will be
556 for(i = 0; i < NSIG; i++) {
558 act.sa_handler = SIG_DFL;
560 act.sa_handler = unexpected_signal_handler;
561 sigaction(i, &act, NULL);
564 /* If we didn't detach, allow coredumps */
566 sighandlers[3].handler = SIG_DFL;
568 /* Then, for each known signal that we want to catch, assign a
569 handler to the signal, with error checking this time. */
570 for(i = 0; sighandlers[i].signal; i++) {
571 act.sa_handler = sighandlers[i].handler;
572 if(sigaction(sighandlers[i].signal, &act, NULL) < 0)
573 fprintf(stderr, _("Installing signal handler for signal %d (%s) failed: %s\n"),
574 sighandlers[i].signal, strsignal(sighandlers[i].signal),