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 1.1.2.61 2003/08/02 20:50:38 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 manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
90 logger(LOG_ERR, _("Could not open service manager: %s"), winerror(GetLastError()));
94 if(!strchr(program_name, '\\')) {
95 GetCurrentDirectory(sizeof(command), command);
96 strncat(command, "\\", sizeof(command));
99 strncat(command, program_name, sizeof(command));
100 for(argp = g_argv + 1; *argp; argp++) {
101 strncat(command, " ", sizeof(command));
102 strncat(command, *argp, sizeof(command));
105 service = CreateService(manager, identname, identname,
106 SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, SERVICE_ERROR_NORMAL,
107 command, "NDIS", NULL, NULL, NULL, NULL);
110 logger(LOG_ERR, _("Could not create %s service: %s"), identname, winerror(GetLastError()));
114 logger(LOG_INFO, _("%s service installed"), identname);
116 if(!StartService(service, 0, NULL))
117 logger(LOG_WARNING, _("Could not start %s service: %s"), identname, winerror(GetLastError()));
119 logger(LOG_INFO, _("%s service started"), identname);
124 bool remove_service(void) {
125 manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
127 logger(LOG_ERR, _("Could not open service manager: %s"), winerror(GetLastError()));
131 service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
134 logger(LOG_ERR, _("Could not open %s service: %s"), identname, winerror(GetLastError()));
138 if(!ControlService(service, SERVICE_CONTROL_STOP, &status))
139 logger(LOG_ERR, _("Could not stop %s service: %s"), identname, winerror(GetLastError()));
141 logger(LOG_INFO, _("%s service stopped"), identname);
143 if(!DeleteService(service)) {
144 logger(LOG_ERR, _("Could not remove %s service: %s"), identname, winerror(GetLastError()));
148 logger(LOG_INFO, _("%s service removed"), identname);
153 DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID boe, LPVOID bah) {
155 case SERVICE_CONTROL_STOP:
156 logger(LOG_NOTICE, _("Got %s request"), "SERVICE_CONTROL_STOP");
159 case SERVICE_CONTROL_SHUTDOWN:
160 logger(LOG_NOTICE, _("Got %s request"), "SERVICE_CONTROL_SHUTDOWN");
164 logger(LOG_WARNING, _("Got unexpected request %d"), request);
165 return ERROR_CALL_NOT_IMPLEMENTED;
171 VOID WINAPI run_service(DWORD argc, LPTSTR* argv)
174 extern int main2(int argc, char **argv);
177 status.dwServiceType = SERVICE_WIN32;
178 status.dwCurrentState = SERVICE_RUNNING;
179 status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
180 status.dwWin32ExitCode = 0;
181 status.dwServiceSpecificExitCode = 0;
182 status.dwCheckPoint = 0;
183 status.dwWaitHint = 0;
185 statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
188 logger(LOG_ERR, _("System call `%s' failed: %s"), "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
191 SetServiceStatus(statushandle, &status);
193 err = main2(argc, argv);
195 status.dwCurrentState = SERVICE_STOPPED;
196 status.dwWin32ExitCode = err;
198 SetServiceStatus(statushandle, &status);
204 bool init_service(void) {
205 SERVICE_TABLE_ENTRY services[] = {
206 {identname, run_service},
210 if(!StartServiceCtrlDispatcher(services)) {
211 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
215 logger(LOG_ERR, _("System call `%s' failed: %s"), "StartServiceCtrlDispatcher", winerror(GetLastError()));
224 check for an existing tinc for this net, and write pid to pidfile
226 static bool write_pidfile(void)
232 pid = check_pid(pidfilename);
236 fprintf(stderr, _("A tincd is already running for net `%s' with pid %d.\n"),
239 fprintf(stderr, _("A tincd is already running with pid %d.\n"), pid);
243 /* if it's locked, write-protected, or whatever */
244 if(!write_pid(pidfilename))
252 kill older tincd for this net
254 bool kill_other(int signal)
261 pid = read_pid(pidfilename);
265 fprintf(stderr, _("No other tincd is running for net `%s'.\n"),
268 fprintf(stderr, _("No other tincd is running.\n"));
272 errno = 0; /* No error, sometimes errno is only changed on error */
274 /* ESRCH is returned when no process with that pid is found */
275 if(kill(pid, signal) && errno == ESRCH) {
277 fprintf(stderr, _("The tincd for net `%s' is no longer running. "),
280 fprintf(stderr, _("The tincd is no longer running. "));
282 fprintf(stderr, _("Removing stale lock file.\n"));
283 remove_pid(pidfilename);
288 return remove_service();
293 Detach from current terminal, write pidfile, kill parent
301 /* First check if we can open a fresh new pidfile */
307 /* If we succeeded in doing that, detach */
315 fprintf(stderr, _("Couldn't detach from terminal: %s"),
320 /* Now UPDATE the pid in the pidfile, because we changed it... */
322 if(!write_pid(pidfilename))
326 exit(install_service());
330 openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
332 logger(LOG_NOTICE, _("tincd %s (%s %s) starting, debug level %d"),
333 VERSION, __DATE__, __TIME__, debug_level);
335 xalloc_fail_func = memory_full;
342 Execute the program name, with sane environment.
344 static void _execute_script(const char *scriptname, char **envp)
345 __attribute__ ((__noreturn__));
346 static void _execute_script(const char *scriptname, char **envp)
359 /* Close all file descriptors */
362 execl(scriptname, scriptname, NULL);
363 /* No return on success */
367 openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
368 logger(LOG_ERR, _("Could not execute `%s': %s"), scriptname,
369 strerror(save_errno));
375 Fork and execute the program pointed to by name.
377 bool execute_script(const char *name, char **envp)
387 asprintf(&scriptname, "%s/%s", confbase, name);
389 /* First check if there is a script */
391 if(stat(scriptname, &s))
397 logger(LOG_ERR, _("System call `%s' failed: %s"), "fork",
403 ifdebug(STATUS) logger(LOG_INFO, _("Executing script %s"), name);
407 if(waitpid(pid, &status, 0) == pid) {
408 if(WIFEXITED(status)) { /* Child exited by itself */
409 if(WEXITSTATUS(status)) {
410 logger(LOG_ERR, _("Process %d (%s) exited with non-zero status %d"),
411 pid, name, WEXITSTATUS(status));
415 } else if(WIFSIGNALED(status)) { /* Child was killed by a signal */
416 logger(LOG_ERR, _("Process %d (%s) was killed by signal %d (%s)"), pid,
417 name, WTERMSIG(status), strsignal(WTERMSIG(status)));
419 } else { /* Something strange happened */
420 logger(LOG_ERR, _("Process %d (%s) terminated abnormally"), pid,
424 } else if (errno != EINTR) {
425 logger(LOG_ERR, _("System call `%s' failed: %s"), "waitpid",
430 /* Why do we get EINTR? */
436 _execute_script(scriptname, envp);
448 static RETSIGTYPE sigterm_handler(int a)
450 logger(LOG_NOTICE, _("Got TERM signal"));
454 static RETSIGTYPE sigquit_handler(int a)
456 logger(LOG_NOTICE, _("Got QUIT signal"));
460 static RETSIGTYPE fatal_signal_square(int a)
462 logger(LOG_ERR, _("Got another fatal signal %d (%s): not restarting."), a,
468 static RETSIGTYPE fatal_signal_handler(int a)
470 struct sigaction act;
471 logger(LOG_ERR, _("Got fatal signal %d (%s)"), a, strsignal(a));
475 logger(LOG_NOTICE, _("Trying to re-execute in 5 seconds..."));
477 act.sa_handler = fatal_signal_square;
478 act.sa_mask = emptysigset;
480 sigaction(SIGSEGV, &act, NULL);
482 close_network_connections();
484 remove_pid(pidfilename);
485 execvp(g_argv[0], g_argv);
487 logger(LOG_NOTICE, _("Not restarting."));
492 static RETSIGTYPE sighup_handler(int a)
494 logger(LOG_NOTICE, _("Got HUP signal"));
498 static RETSIGTYPE sigint_handler(int a)
500 if(saved_debug_level != -1) {
501 logger(LOG_NOTICE, _("Reverting to old debug level (%d)"),
503 debug_level = saved_debug_level;
504 saved_debug_level = -1;
507 _("Temporarily setting debug level to 5. Kill me with SIGINT again to go back to level %d."),
509 saved_debug_level = debug_level;
514 static RETSIGTYPE sigalrm_handler(int a)
516 logger(LOG_NOTICE, _("Got ALRM signal"));
520 static RETSIGTYPE sigusr1_handler(int a)
525 static RETSIGTYPE sigusr2_handler(int a)
533 static RETSIGTYPE sigwinch_handler(int a)
538 static RETSIGTYPE unexpected_signal_handler(int a)
540 logger(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a));
544 static RETSIGTYPE ignore_signal_handler(int a)
546 ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Ignored signal %d (%s)"), a, strsignal(a));
551 void (*handler)(int);
553 {SIGHUP, sighup_handler},
554 {SIGTERM, sigterm_handler},
555 {SIGQUIT, sigquit_handler},
556 {SIGSEGV, fatal_signal_handler},
557 {SIGBUS, fatal_signal_handler},
558 {SIGILL, fatal_signal_handler},
559 {SIGPIPE, ignore_signal_handler},
560 {SIGINT, sigint_handler},
561 {SIGUSR1, sigusr1_handler},
562 {SIGUSR2, sigusr2_handler},
563 {SIGCHLD, ignore_signal_handler},
564 {SIGALRM, sigalrm_handler},
565 {SIGWINCH, sigwinch_handler},
570 void setup_signals(void)
574 struct sigaction act;
576 sigemptyset(&emptysigset);
577 act.sa_handler = NULL;
578 act.sa_mask = emptysigset;
581 /* Set a default signal handler for every signal, errors will be
583 for(i = 0; i < NSIG; i++) {
585 act.sa_handler = SIG_DFL;
587 act.sa_handler = unexpected_signal_handler;
588 sigaction(i, &act, NULL);
591 /* If we didn't detach, allow coredumps */
593 sighandlers[3].handler = SIG_DFL;
595 /* Then, for each known signal that we want to catch, assign a
596 handler to the signal, with error checking this time. */
597 for(i = 0; sighandlers[i].signal; i++) {
598 act.sa_handler = sighandlers[i].handler;
599 if(sigaction(sighandlers[i].signal, &act, NULL) < 0)
600 fprintf(stderr, _("Installing signal handler for signal %d (%s) failed: %s\n"),
601 sighandlers[i].signal, strsignal(sighandlers[i].signal),