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 1.1.2.72 2003/08/16 12:11:11 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] = "";
88 SERVICE_DESCRIPTION description = {"Virtual Private Network daemon"};
90 manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
92 logger(LOG_ERR, _("Could not open service manager: %s"), winerror(GetLastError()));
96 strncat(command, "\"", sizeof(command));
98 if(!strchr(program_name, '\\')) {
99 GetCurrentDirectory(sizeof(command), command);
100 strncat(command, "\\", sizeof(command));
103 strncat(command, program_name, sizeof(command));
105 strncat(command, "\"", sizeof(command));
107 for(argp = g_argv + 1; *argp; argp++) {
108 space = strchr(*argp, ' ');
109 strncat(command, " ", sizeof(command));
112 strncat(command, "\"", sizeof(command));
114 strncat(command, *argp, sizeof(command));
117 strncat(command, "\"", sizeof(command));
120 service = CreateService(manager, identname, identname,
121 SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, SERVICE_ERROR_NORMAL,
122 command, "NDIS", NULL, NULL, NULL, NULL);
125 logger(LOG_ERR, _("Could not create %s service: %s"), identname, winerror(GetLastError()));
129 ChangeServiceConfig2(service, SERVICE_CONFIG_DESCRIPTION, &description);
131 logger(LOG_INFO, _("%s service installed"), identname);
133 if(!StartService(service, 0, NULL))
134 logger(LOG_WARNING, _("Could not start %s service: %s"), identname, winerror(GetLastError()));
136 logger(LOG_INFO, _("%s service started"), identname);
141 bool remove_service(void) {
142 manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
144 logger(LOG_ERR, _("Could not open service manager: %s"), winerror(GetLastError()));
148 service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
151 logger(LOG_ERR, _("Could not open %s service: %s"), identname, winerror(GetLastError()));
155 if(!ControlService(service, SERVICE_CONTROL_STOP, &status))
156 logger(LOG_ERR, _("Could not stop %s service: %s"), identname, winerror(GetLastError()));
158 logger(LOG_INFO, _("%s service stopped"), identname);
160 if(!DeleteService(service)) {
161 logger(LOG_ERR, _("Could not remove %s service: %s"), identname, winerror(GetLastError()));
165 logger(LOG_INFO, _("%s service removed"), identname);
170 DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID boe, LPVOID bah) {
172 case SERVICE_CONTROL_STOP:
173 logger(LOG_NOTICE, _("Got %s request"), "SERVICE_CONTROL_STOP");
176 case SERVICE_CONTROL_SHUTDOWN:
177 logger(LOG_NOTICE, _("Got %s request"), "SERVICE_CONTROL_SHUTDOWN");
181 logger(LOG_WARNING, _("Got unexpected request %d"), request);
182 return ERROR_CALL_NOT_IMPLEMENTED;
186 status.dwWaitHint = 30000;
187 status.dwCurrentState = SERVICE_STOP_PENDING;
188 SetServiceStatus(statushandle, &status);
194 VOID WINAPI run_service(DWORD argc, LPTSTR* argv)
197 extern int main2(int argc, char **argv);
200 status.dwServiceType = SERVICE_WIN32;
201 status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
202 status.dwWin32ExitCode = 0;
203 status.dwServiceSpecificExitCode = 0;
204 status.dwCheckPoint = 0;
206 statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
209 logger(LOG_ERR, _("System call `%s' failed: %s"), "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
212 status.dwWaitHint = 30000;
213 status.dwCurrentState = SERVICE_START_PENDING;
214 SetServiceStatus(statushandle, &status);
216 status.dwWaitHint = 0;
217 status.dwCurrentState = SERVICE_RUNNING;
218 SetServiceStatus(statushandle, &status);
220 err = main2(argc, argv);
222 status.dwWaitHint = 0;
223 status.dwCurrentState = SERVICE_STOPPED;
224 //status.dwWin32ExitCode = err;
225 SetServiceStatus(statushandle, &status);
231 bool init_service(void) {
232 SERVICE_TABLE_ENTRY services[] = {
233 {identname, run_service},
237 if(!StartServiceCtrlDispatcher(services)) {
238 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
242 logger(LOG_ERR, _("System call `%s' failed: %s"), "StartServiceCtrlDispatcher", winerror(GetLastError()));
251 check for an existing tinc for this net, and write pid to pidfile
253 static bool write_pidfile(void)
259 pid = check_pid(pidfilename);
263 fprintf(stderr, _("A tincd is already running for net `%s' with pid %d.\n"),
266 fprintf(stderr, _("A tincd is already running with pid %d.\n"), pid);
270 /* if it's locked, write-protected, or whatever */
271 if(!write_pid(pidfilename))
279 kill older tincd for this net
281 bool kill_other(int signal)
288 pid = read_pid(pidfilename);
292 fprintf(stderr, _("No other tincd is running for net `%s'.\n"),
295 fprintf(stderr, _("No other tincd is running.\n"));
299 errno = 0; /* No error, sometimes errno is only changed on error */
301 /* ESRCH is returned when no process with that pid is found */
302 if(kill(pid, signal) && errno == ESRCH) {
304 fprintf(stderr, _("The tincd for net `%s' is no longer running. "),
307 fprintf(stderr, _("The tincd is no longer running. "));
309 fprintf(stderr, _("Removing stale lock file.\n"));
310 remove_pid(pidfilename);
315 return remove_service();
320 Detach from current terminal, write pidfile, kill parent
328 /* First check if we can open a fresh new pidfile */
334 /* If we succeeded in doing that, detach */
342 fprintf(stderr, _("Couldn't detach from terminal: %s"),
347 /* Now UPDATE the pid in the pidfile, because we changed it... */
349 if(!write_pid(pidfilename))
353 exit(install_service());
357 openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
359 logger(LOG_NOTICE, _("tincd %s (%s %s) starting, debug level %d"),
360 VERSION, __DATE__, __TIME__, debug_level);
362 xalloc_fail_func = memory_full;
367 bool execute_script(const char *name, char **envp)
377 len = asprintf(&scriptname, "\"%s/%s\"", confbase, name);
379 len = asprintf(&scriptname, "\"%s/%s.bat\"", confbase, name);
384 scriptname[len - 1] = '\0';
386 /* First check if there is a script */
388 if(stat(scriptname + 1, &s))
391 ifdebug(STATUS) logger(LOG_INFO, _("Executing script %s"), name);
394 /* Set environment */
400 scriptname[len - 1] = '\"';
401 status = system(scriptname);
405 /* Unset environment? */
409 if(WIFEXITED(status)) { /* Child exited by itself */
410 if(WEXITSTATUS(status)) {
411 logger(LOG_ERR, _("Script %s exited with non-zero status %d"),
412 name, WEXITSTATUS(status));
415 } else if(WIFSIGNALED(status)) { /* Child was killed by a signal */
416 logger(LOG_ERR, _("Script %s was killed by signal %d (%s)"),
417 name, WTERMSIG(status), strsignal(WTERMSIG(status)));
419 } else { /* Something strange happened */
420 logger(LOG_ERR, _("Script %s terminated abnormally"), name);
424 logger(LOG_ERR, _("System call `%s' failed: %s"), "system", strerror(errno));
438 static RETSIGTYPE sigterm_handler(int a)
440 logger(LOG_NOTICE, _("Got %s signal"), "TERM");
444 static RETSIGTYPE sigquit_handler(int a)
446 logger(LOG_NOTICE, _("Got %s signal"), "QUIT");
450 static RETSIGTYPE fatal_signal_square(int a)
452 logger(LOG_ERR, _("Got another fatal signal %d (%s): not restarting."), a,
458 static RETSIGTYPE fatal_signal_handler(int a)
460 struct sigaction act;
461 logger(LOG_ERR, _("Got fatal signal %d (%s)"), a, strsignal(a));
465 logger(LOG_NOTICE, _("Trying to re-execute in 5 seconds..."));
467 act.sa_handler = fatal_signal_square;
468 act.sa_mask = emptysigset;
470 sigaction(SIGSEGV, &act, NULL);
472 close_network_connections();
474 remove_pid(pidfilename);
475 execvp(g_argv[0], g_argv);
477 logger(LOG_NOTICE, _("Not restarting."));
482 static RETSIGTYPE sighup_handler(int a)
484 logger(LOG_NOTICE, _("Got %s signal"), "HUP");
488 static RETSIGTYPE sigint_handler(int a)
490 logger(LOG_NOTICE, _("Got %s signal"), "INT");
492 if(saved_debug_level != -1) {
493 logger(LOG_NOTICE, _("Reverting to old debug level (%d)"),
495 debug_level = saved_debug_level;
496 saved_debug_level = -1;
499 _("Temporarily setting debug level to 5. Kill me with SIGINT again to go back to level %d."),
501 saved_debug_level = debug_level;
506 static RETSIGTYPE sigalrm_handler(int a)
508 logger(LOG_NOTICE, _("Got %s signal"), "ALRM");
512 static RETSIGTYPE sigusr1_handler(int a)
517 static RETSIGTYPE sigusr2_handler(int a)
525 static RETSIGTYPE sigwinch_handler(int a)
530 static RETSIGTYPE unexpected_signal_handler(int a)
532 logger(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a));
536 static RETSIGTYPE ignore_signal_handler(int a)
538 ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Ignored signal %d (%s)"), a, strsignal(a));
543 void (*handler)(int);
545 {SIGHUP, sighup_handler},
546 {SIGTERM, sigterm_handler},
547 {SIGQUIT, sigquit_handler},
548 {SIGSEGV, fatal_signal_handler},
549 {SIGBUS, fatal_signal_handler},
550 {SIGILL, fatal_signal_handler},
551 {SIGPIPE, ignore_signal_handler},
552 {SIGINT, sigint_handler},
553 {SIGUSR1, sigusr1_handler},
554 {SIGUSR2, sigusr2_handler},
555 {SIGCHLD, ignore_signal_handler},
556 {SIGALRM, sigalrm_handler},
557 {SIGWINCH, sigwinch_handler},
562 void setup_signals(void)
566 struct sigaction act;
568 sigemptyset(&emptysigset);
569 act.sa_handler = NULL;
570 act.sa_mask = emptysigset;
573 /* Set a default signal handler for every signal, errors will be
575 for(i = 0; i < NSIG; i++) {
577 act.sa_handler = SIG_DFL;
579 act.sa_handler = unexpected_signal_handler;
580 sigaction(i, &act, NULL);
583 /* If we didn't detach, allow coredumps */
585 sighandlers[3].handler = SIG_DFL;
587 /* Then, for each known signal that we want to catch, assign a
588 handler to the signal, with error checking this time. */
589 for(i = 0; sighandlers[i].signal; i++) {
590 act.sa_handler = sighandlers[i].handler;
591 if(sigaction(sighandlers[i].signal, &act, NULL) < 0)
592 fprintf(stderr, _("Installing signal handler for signal %d (%s) failed: %s\n"),
593 sighandlers[i].signal, strsignal(sighandlers[i].signal),