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 1.1.2.69 2003/08/08 22:11:54 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, " ", sizeof(command));
106 strncat(command, "\"", sizeof(command));
108 strncat(command, *argp, sizeof(command));
111 strncat(command, "\"", sizeof(command));
114 service = CreateService(manager, identname, identname,
115 SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, SERVICE_ERROR_NORMAL,
116 command, "NDIS", NULL, NULL, NULL, NULL);
119 logger(LOG_ERR, _("Could not create %s service: %s"), identname, winerror(GetLastError()));
123 logger(LOG_INFO, _("%s service installed"), identname);
125 if(!StartService(service, 0, NULL))
126 logger(LOG_WARNING, _("Could not start %s service: %s"), identname, winerror(GetLastError()));
128 logger(LOG_INFO, _("%s service started"), identname);
133 bool remove_service(void) {
134 manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
136 logger(LOG_ERR, _("Could not open service manager: %s"), winerror(GetLastError()));
140 service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
143 logger(LOG_ERR, _("Could not open %s service: %s"), identname, winerror(GetLastError()));
147 if(!ControlService(service, SERVICE_CONTROL_STOP, &status))
148 logger(LOG_ERR, _("Could not stop %s service: %s"), identname, winerror(GetLastError()));
150 logger(LOG_INFO, _("%s service stopped"), identname);
152 if(!DeleteService(service)) {
153 logger(LOG_ERR, _("Could not remove %s service: %s"), identname, winerror(GetLastError()));
157 logger(LOG_INFO, _("%s service removed"), identname);
162 DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID boe, LPVOID bah) {
164 case SERVICE_CONTROL_STOP:
165 logger(LOG_NOTICE, _("Got %s request"), "SERVICE_CONTROL_STOP");
168 case SERVICE_CONTROL_SHUTDOWN:
169 logger(LOG_NOTICE, _("Got %s request"), "SERVICE_CONTROL_SHUTDOWN");
173 logger(LOG_WARNING, _("Got unexpected request %d"), request);
174 return ERROR_CALL_NOT_IMPLEMENTED;
178 status.dwWaitHint = 30000;
179 status.dwCurrentState = SERVICE_STOP_PENDING;
180 SetServiceStatus(statushandle, &status);
186 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)
251 pid = check_pid(pidfilename);
255 fprintf(stderr, _("A tincd is already running for net `%s' with pid %d.\n"),
258 fprintf(stderr, _("A tincd is already running with pid %d.\n"), pid);
262 /* if it's locked, write-protected, or whatever */
263 if(!write_pid(pidfilename))
271 kill older tincd for this net
273 bool kill_other(int signal)
280 pid = read_pid(pidfilename);
284 fprintf(stderr, _("No other tincd is running for net `%s'.\n"),
287 fprintf(stderr, _("No other tincd is running.\n"));
291 errno = 0; /* No error, sometimes errno is only changed on error */
293 /* ESRCH is returned when no process with that pid is found */
294 if(kill(pid, signal) && errno == ESRCH) {
296 fprintf(stderr, _("The tincd for net `%s' is no longer running. "),
299 fprintf(stderr, _("The tincd is no longer running. "));
301 fprintf(stderr, _("Removing stale lock file.\n"));
302 remove_pid(pidfilename);
307 return remove_service();
312 Detach from current terminal, write pidfile, kill parent
320 /* First check if we can open a fresh new pidfile */
326 /* If we succeeded in doing that, detach */
334 fprintf(stderr, _("Couldn't detach from terminal: %s"),
339 /* Now UPDATE the pid in the pidfile, because we changed it... */
341 if(!write_pid(pidfilename))
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)
368 asprintf(&scriptname, "\"%s/%s\"", confbase, name);
371 /* First check if there is a script */
373 if(stat(scriptname, &s))
376 ifdebug(STATUS) logger(LOG_INFO, _("Executing script %s"), name);
380 /* Set environment */
386 status = system(scriptname);
390 /* Unset environment? */
394 if(WIFEXITED(status)) { /* Child exited by itself */
395 if(WEXITSTATUS(status)) {
396 logger(LOG_ERR, _("Script %s exited with non-zero status %d"),
397 name, WEXITSTATUS(status));
400 } else if(WIFSIGNALED(status)) { /* Child was killed by a signal */
401 logger(LOG_ERR, _("Script %s was killed by signal %d (%s)"),
402 name, WTERMSIG(status), strsignal(WTERMSIG(status)));
404 } else { /* Something strange happened */
405 logger(LOG_ERR, _("Script %s terminated abnormally"), name);
409 logger(LOG_ERR, _("System call `%s' failed: %s"), "system", strerror(errno));
423 static RETSIGTYPE sigterm_handler(int a)
425 logger(LOG_NOTICE, _("Got %s signal"), "TERM");
429 static RETSIGTYPE sigquit_handler(int a)
431 logger(LOG_NOTICE, _("Got %s signal"), "QUIT");
435 static RETSIGTYPE fatal_signal_square(int a)
437 logger(LOG_ERR, _("Got another fatal signal %d (%s): not restarting."), a,
443 static RETSIGTYPE fatal_signal_handler(int a)
445 struct sigaction act;
446 logger(LOG_ERR, _("Got fatal signal %d (%s)"), a, strsignal(a));
450 logger(LOG_NOTICE, _("Trying to re-execute in 5 seconds..."));
452 act.sa_handler = fatal_signal_square;
453 act.sa_mask = emptysigset;
455 sigaction(SIGSEGV, &act, NULL);
457 close_network_connections();
459 remove_pid(pidfilename);
460 execvp(g_argv[0], g_argv);
462 logger(LOG_NOTICE, _("Not restarting."));
467 static RETSIGTYPE sighup_handler(int a)
469 logger(LOG_NOTICE, _("Got %s signal"), "HUP");
473 static RETSIGTYPE sigint_handler(int a)
475 logger(LOG_NOTICE, _("Got %s signal"), "INT");
477 if(saved_debug_level != -1) {
478 logger(LOG_NOTICE, _("Reverting to old debug level (%d)"),
480 debug_level = saved_debug_level;
481 saved_debug_level = -1;
484 _("Temporarily setting debug level to 5. Kill me with SIGINT again to go back to level %d."),
486 saved_debug_level = debug_level;
491 static RETSIGTYPE sigalrm_handler(int a)
493 logger(LOG_NOTICE, _("Got %s signal"), "ALRM");
497 static RETSIGTYPE sigusr1_handler(int a)
502 static RETSIGTYPE sigusr2_handler(int a)
510 static RETSIGTYPE sigwinch_handler(int a)
515 static RETSIGTYPE unexpected_signal_handler(int a)
517 logger(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a));
521 static RETSIGTYPE ignore_signal_handler(int a)
523 ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Ignored signal %d (%s)"), a, strsignal(a));
528 void (*handler)(int);
530 {SIGHUP, sighup_handler},
531 {SIGTERM, sigterm_handler},
532 {SIGQUIT, sigquit_handler},
533 {SIGSEGV, fatal_signal_handler},
534 {SIGBUS, fatal_signal_handler},
535 {SIGILL, fatal_signal_handler},
536 {SIGPIPE, ignore_signal_handler},
537 {SIGINT, sigint_handler},
538 {SIGUSR1, sigusr1_handler},
539 {SIGUSR2, sigusr2_handler},
540 {SIGCHLD, ignore_signal_handler},
541 {SIGALRM, sigalrm_handler},
542 {SIGWINCH, sigwinch_handler},
547 void setup_signals(void)
551 struct sigaction act;
553 sigemptyset(&emptysigset);
554 act.sa_handler = NULL;
555 act.sa_mask = emptysigset;
558 /* Set a default signal handler for every signal, errors will be
560 for(i = 0; i < NSIG; i++) {
562 act.sa_handler = SIG_DFL;
564 act.sa_handler = unexpected_signal_handler;
565 sigaction(i, &act, NULL);
568 /* If we didn't detach, allow coredumps */
570 sighandlers[3].handler = SIG_DFL;
572 /* Then, for each known signal that we want to catch, assign a
573 handler to the signal, with error checking this time. */
574 for(i = 0; sighandlers[i].signal; i++) {
575 act.sa_handler = sighandlers[i].handler;
576 if(sigaction(sighandlers[i].signal, &act, NULL) < 0)
577 fprintf(stderr, _("Installing signal handler for signal %d (%s) failed: %s\n"),
578 sighandlers[i].signal, strsignal(sighandlers[i].signal),