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 1.1.2.66 2003/08/08 17:17:13 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));
105 strncat(command, "\"", sizeof(command));
106 strncat(command, *argp, sizeof(command));
108 strncat(command, "\"", sizeof(command));
111 service = CreateService(manager, identname, identname,
112 SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, SERVICE_ERROR_NORMAL,
113 command, "NDIS", NULL, NULL, NULL, NULL);
116 logger(LOG_ERR, _("Could not create %s service: %s"), identname, winerror(GetLastError()));
120 logger(LOG_INFO, _("%s service installed"), identname);
122 if(!StartService(service, 0, NULL))
123 logger(LOG_WARNING, _("Could not start %s service: %s"), identname, winerror(GetLastError()));
125 logger(LOG_INFO, _("%s service started"), identname);
130 bool remove_service(void) {
131 manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
133 logger(LOG_ERR, _("Could not open service manager: %s"), winerror(GetLastError()));
137 service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
140 logger(LOG_ERR, _("Could not open %s service: %s"), identname, winerror(GetLastError()));
144 if(!ControlService(service, SERVICE_CONTROL_STOP, &status))
145 logger(LOG_ERR, _("Could not stop %s service: %s"), identname, winerror(GetLastError()));
147 logger(LOG_INFO, _("%s service stopped"), identname);
149 if(!DeleteService(service)) {
150 logger(LOG_ERR, _("Could not remove %s service: %s"), identname, winerror(GetLastError()));
154 logger(LOG_INFO, _("%s service removed"), identname);
159 DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID boe, LPVOID bah) {
161 case SERVICE_CONTROL_STOP:
162 logger(LOG_NOTICE, _("Got %s request"), "SERVICE_CONTROL_STOP");
165 case SERVICE_CONTROL_SHUTDOWN:
166 logger(LOG_NOTICE, _("Got %s request"), "SERVICE_CONTROL_SHUTDOWN");
170 logger(LOG_WARNING, _("Got unexpected request %d"), request);
171 return ERROR_CALL_NOT_IMPLEMENTED;
175 status.dwWaitHint = 30000;
176 status.dwCurrentState = SERVICE_STOP_PENDING;
177 SetServiceStatus(statushandle, &status);
183 VOID WINAPI run_service(DWORD argc, LPTSTR* argv)
186 extern int main2(int argc, char **argv);
189 status.dwServiceType = SERVICE_WIN32;
190 status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
191 status.dwWin32ExitCode = 0;
192 status.dwServiceSpecificExitCode = 0;
193 status.dwCheckPoint = 0;
195 statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
198 logger(LOG_ERR, _("System call `%s' failed: %s"), "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
201 status.dwWaitHint = 30000;
202 status.dwCurrentState = SERVICE_START_PENDING;
203 SetServiceStatus(statushandle, &status);
205 status.dwWaitHint = 0;
206 status.dwCurrentState = SERVICE_RUNNING;
207 SetServiceStatus(statushandle, &status);
209 err = main2(argc, argv);
211 status.dwWaitHint = 0;
212 status.dwCurrentState = SERVICE_STOPPED;
213 //status.dwWin32ExitCode = err;
214 SetServiceStatus(statushandle, &status);
220 bool init_service(void) {
221 SERVICE_TABLE_ENTRY services[] = {
222 {identname, run_service},
226 if(!StartServiceCtrlDispatcher(services)) {
227 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
231 logger(LOG_ERR, _("System call `%s' failed: %s"), "StartServiceCtrlDispatcher", winerror(GetLastError()));
240 check for an existing tinc for this net, and write pid to pidfile
242 static bool write_pidfile(void)
248 pid = check_pid(pidfilename);
252 fprintf(stderr, _("A tincd is already running for net `%s' with pid %d.\n"),
255 fprintf(stderr, _("A tincd is already running with pid %d.\n"), pid);
259 /* if it's locked, write-protected, or whatever */
260 if(!write_pid(pidfilename))
268 kill older tincd for this net
270 bool kill_other(int signal)
277 pid = read_pid(pidfilename);
281 fprintf(stderr, _("No other tincd is running for net `%s'.\n"),
284 fprintf(stderr, _("No other tincd is running.\n"));
288 errno = 0; /* No error, sometimes errno is only changed on error */
290 /* ESRCH is returned when no process with that pid is found */
291 if(kill(pid, signal) && errno == ESRCH) {
293 fprintf(stderr, _("The tincd for net `%s' is no longer running. "),
296 fprintf(stderr, _("The tincd is no longer running. "));
298 fprintf(stderr, _("Removing stale lock file.\n"));
299 remove_pid(pidfilename);
304 return remove_service();
309 Detach from current terminal, write pidfile, kill parent
317 /* First check if we can open a fresh new pidfile */
323 /* If we succeeded in doing that, detach */
331 fprintf(stderr, _("Couldn't detach from terminal: %s"),
336 /* Now UPDATE the pid in the pidfile, because we changed it... */
338 if(!write_pid(pidfilename))
342 exit(install_service());
346 openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
348 logger(LOG_NOTICE, _("tincd %s (%s %s) starting, debug level %d"),
349 VERSION, __DATE__, __TIME__, debug_level);
351 xalloc_fail_func = memory_full;
356 bool execute_script(const char *name, char **envp)
366 asprintf(&scriptname, "%s/%s", confbase, name);
368 /* First check if there is a script */
370 if(stat(scriptname, &s))
373 /* Set environment */
378 ifdebug(STATUS) logger(LOG_INFO, _("Executing script %s"), name);
380 status = system(scriptname);
384 /* Unset environment? */
387 if(WIFEXITED(status)) { /* Child exited by itself */
388 if(WEXITSTATUS(status)) {
389 logger(LOG_ERR, _("Process %d (%s) exited with non-zero status %d"),
390 pid, name, WEXITSTATUS(status));
393 } else if(WIFSIGNALED(status)) { /* Child was killed by a signal */
394 logger(LOG_ERR, _("Process %d (%s) was killed by signal %d (%s)"), pid,
395 name, WTERMSIG(status), strsignal(WTERMSIG(status)));
397 } else { /* Something strange happened */
398 logger(LOG_ERR, _("Process %d (%s) terminated abnormally"), pid,
403 logger(LOG_ERR, _("System call `%s' failed: %s"), "system",
417 static RETSIGTYPE sigterm_handler(int a)
419 logger(LOG_NOTICE, _("Got %s signal"), "TERM");
423 static RETSIGTYPE sigquit_handler(int a)
425 logger(LOG_NOTICE, _("Got %s signal"), "QUIT");
429 static RETSIGTYPE fatal_signal_square(int a)
431 logger(LOG_ERR, _("Got another fatal signal %d (%s): not restarting."), a,
437 static RETSIGTYPE fatal_signal_handler(int a)
439 struct sigaction act;
440 logger(LOG_ERR, _("Got fatal signal %d (%s)"), a, strsignal(a));
444 logger(LOG_NOTICE, _("Trying to re-execute in 5 seconds..."));
446 act.sa_handler = fatal_signal_square;
447 act.sa_mask = emptysigset;
449 sigaction(SIGSEGV, &act, NULL);
451 close_network_connections();
453 remove_pid(pidfilename);
454 execvp(g_argv[0], g_argv);
456 logger(LOG_NOTICE, _("Not restarting."));
461 static RETSIGTYPE sighup_handler(int a)
463 logger(LOG_NOTICE, _("Got %s signal"), "HUP");
467 static RETSIGTYPE sigint_handler(int a)
469 logger(LOG_NOTICE, _("Got %s signal"), "INT");
471 if(saved_debug_level != -1) {
472 logger(LOG_NOTICE, _("Reverting to old debug level (%d)"),
474 debug_level = saved_debug_level;
475 saved_debug_level = -1;
478 _("Temporarily setting debug level to 5. Kill me with SIGINT again to go back to level %d."),
480 saved_debug_level = debug_level;
485 static RETSIGTYPE sigalrm_handler(int a)
487 logger(LOG_NOTICE, _("Got %s signal"), "ALRM");
491 static RETSIGTYPE sigusr1_handler(int a)
496 static RETSIGTYPE sigusr2_handler(int a)
504 static RETSIGTYPE sigwinch_handler(int a)
509 static RETSIGTYPE unexpected_signal_handler(int a)
511 logger(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a));
515 static RETSIGTYPE ignore_signal_handler(int a)
517 ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Ignored signal %d (%s)"), a, strsignal(a));
522 void (*handler)(int);
524 {SIGHUP, sighup_handler},
525 {SIGTERM, sigterm_handler},
526 {SIGQUIT, sigquit_handler},
527 {SIGSEGV, fatal_signal_handler},
528 {SIGBUS, fatal_signal_handler},
529 {SIGILL, fatal_signal_handler},
530 {SIGPIPE, ignore_signal_handler},
531 {SIGINT, sigint_handler},
532 {SIGUSR1, sigusr1_handler},
533 {SIGUSR2, sigusr2_handler},
534 {SIGCHLD, ignore_signal_handler},
535 {SIGALRM, sigalrm_handler},
536 {SIGWINCH, sigwinch_handler},
541 void setup_signals(void)
545 struct sigaction act;
547 sigemptyset(&emptysigset);
548 act.sa_handler = NULL;
549 act.sa_mask = emptysigset;
552 /* Set a default signal handler for every signal, errors will be
554 for(i = 0; i < NSIG; i++) {
556 act.sa_handler = SIG_DFL;
558 act.sa_handler = unexpected_signal_handler;
559 sigaction(i, &act, NULL);
562 /* If we didn't detach, allow coredumps */
564 sighandlers[3].handler = SIG_DFL;
566 /* Then, for each known signal that we want to catch, assign a
567 handler to the signal, with error checking this time. */
568 for(i = 0; sighandlers[i].signal; i++) {
569 act.sa_handler = sighandlers[i].handler;
570 if(sigaction(sighandlers[i].signal, &act, NULL) < 0)
571 fprintf(stderr, _("Installing signal handler for signal %d (%s) failed: %s\n"),
572 sighandlers[i].signal, strsignal(sighandlers[i].signal),