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 1.5 2003/08/24 20:38:25 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 if(!strchr(program_name, '\\')) {
97 GetCurrentDirectory(sizeof(command) - 1, command + 1);
98 strncat(command, "\\", sizeof(command));
101 strncat(command, program_name, sizeof(command));
103 strncat(command, "\"", sizeof(command));
105 for(argp = g_argv + 1; *argp; argp++) {
106 space = strchr(*argp, ' ');
107 strncat(command, " ", sizeof(command));
110 strncat(command, "\"", sizeof(command));
112 strncat(command, *argp, sizeof(command));
115 strncat(command, "\"", sizeof(command));
118 service = CreateService(manager, identname, identname,
119 SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, SERVICE_ERROR_NORMAL,
120 command, "NDIS", NULL, NULL, NULL, NULL);
123 logger(LOG_ERR, _("Could not create %s service: %s"), identname, winerror(GetLastError()));
127 ChangeServiceConfig2(service, SERVICE_CONFIG_DESCRIPTION, &description);
129 logger(LOG_INFO, _("%s service installed"), identname);
131 if(!StartService(service, 0, NULL))
132 logger(LOG_WARNING, _("Could not start %s service: %s"), identname, winerror(GetLastError()));
134 logger(LOG_INFO, _("%s service started"), identname);
139 bool remove_service(void) {
140 manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
142 logger(LOG_ERR, _("Could not open service manager: %s"), winerror(GetLastError()));
146 service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
149 logger(LOG_ERR, _("Could not open %s service: %s"), identname, winerror(GetLastError()));
153 if(!ControlService(service, SERVICE_CONTROL_STOP, &status))
154 logger(LOG_ERR, _("Could not stop %s service: %s"), identname, winerror(GetLastError()));
156 logger(LOG_INFO, _("%s service stopped"), identname);
158 if(!DeleteService(service)) {
159 logger(LOG_ERR, _("Could not remove %s service: %s"), identname, winerror(GetLastError()));
163 logger(LOG_INFO, _("%s service removed"), identname);
168 DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID boe, LPVOID bah) {
170 case SERVICE_CONTROL_STOP:
171 logger(LOG_NOTICE, _("Got %s request"), "SERVICE_CONTROL_STOP");
173 case SERVICE_CONTROL_SHUTDOWN:
174 logger(LOG_NOTICE, _("Got %s request"), "SERVICE_CONTROL_SHUTDOWN");
177 logger(LOG_WARNING, _("Got unexpected request %d"), request);
178 return ERROR_CALL_NOT_IMPLEMENTED;
183 status.dwWaitHint = 30000;
184 status.dwCurrentState = SERVICE_STOP_PENDING;
185 SetServiceStatus(statushandle, &status);
188 status.dwWaitHint = 0;
189 status.dwCurrentState = SERVICE_STOPPED;
190 SetServiceStatus(statushandle, &status);
196 VOID WINAPI run_service(DWORD argc, LPTSTR* argv)
199 extern int main2(int argc, char **argv);
202 status.dwServiceType = SERVICE_WIN32;
203 status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
204 status.dwWin32ExitCode = 0;
205 status.dwServiceSpecificExitCode = 0;
206 status.dwCheckPoint = 0;
208 statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
211 logger(LOG_ERR, _("System call `%s' failed: %s"), "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
214 status.dwWaitHint = 30000;
215 status.dwCurrentState = SERVICE_START_PENDING;
216 SetServiceStatus(statushandle, &status);
218 status.dwWaitHint = 0;
219 status.dwCurrentState = SERVICE_RUNNING;
220 SetServiceStatus(statushandle, &status);
222 err = main2(argc, argv);
224 status.dwWaitHint = 0;
225 status.dwCurrentState = SERVICE_STOPPED;
226 //status.dwWin32ExitCode = err;
227 SetServiceStatus(statushandle, &status);
233 bool init_service(void) {
234 SERVICE_TABLE_ENTRY services[] = {
235 {identname, run_service},
239 if(!StartServiceCtrlDispatcher(services)) {
240 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
244 logger(LOG_ERR, _("System call `%s' failed: %s"), "StartServiceCtrlDispatcher", winerror(GetLastError()));
253 check for an existing tinc for this net, and write pid to pidfile
255 static bool write_pidfile(void)
261 pid = check_pid(pidfilename);
265 fprintf(stderr, _("A tincd is already running for net `%s' with pid %d.\n"),
268 fprintf(stderr, _("A tincd is already running with pid %d.\n"), pid);
272 /* if it's locked, write-protected, or whatever */
273 if(!write_pid(pidfilename))
281 kill older tincd for this net
283 bool kill_other(int signal)
290 pid = read_pid(pidfilename);
294 fprintf(stderr, _("No other tincd is running for net `%s'.\n"),
297 fprintf(stderr, _("No other tincd is running.\n"));
301 errno = 0; /* No error, sometimes errno is only changed on error */
303 /* ESRCH is returned when no process with that pid is found */
304 if(kill(pid, signal) && errno == ESRCH) {
306 fprintf(stderr, _("The tincd for net `%s' is no longer running. "),
309 fprintf(stderr, _("The tincd is no longer running. "));
311 fprintf(stderr, _("Removing stale lock file.\n"));
312 remove_pid(pidfilename);
317 return remove_service();
322 Detach from current terminal, write pidfile, kill parent
330 /* First check if we can open a fresh new pidfile */
336 /* If we succeeded in doing that, detach */
344 fprintf(stderr, _("Couldn't detach from terminal: %s"),
349 /* Now UPDATE the pid in the pidfile, because we changed it... */
351 if(!write_pid(pidfilename))
355 exit(install_service());
359 openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
361 logger(LOG_NOTICE, _("tincd %s (%s %s) starting, debug level %d"),
362 VERSION, __DATE__, __TIME__, debug_level);
364 xalloc_fail_func = memory_full;
369 bool execute_script(const char *name, char **envp)
379 len = asprintf(&scriptname, "\"%s/%s\"", confbase, name);
381 len = asprintf(&scriptname, "\"%s/%s.bat\"", confbase, name);
386 scriptname[len - 1] = '\0';
388 /* First check if there is a script */
390 if(stat(scriptname + 1, &s))
393 ifdebug(STATUS) logger(LOG_INFO, _("Executing script %s"), name);
396 /* Set environment */
402 scriptname[len - 1] = '\"';
403 status = system(scriptname);
407 /* Unset environment? */
411 if(WIFEXITED(status)) { /* Child exited by itself */
412 if(WEXITSTATUS(status)) {
413 logger(LOG_ERR, _("Script %s exited with non-zero status %d"),
414 name, WEXITSTATUS(status));
417 } else if(WIFSIGNALED(status)) { /* Child was killed by a signal */
418 logger(LOG_ERR, _("Script %s was killed by signal %d (%s)"),
419 name, WTERMSIG(status), strsignal(WTERMSIG(status)));
421 } else { /* Something strange happened */
422 logger(LOG_ERR, _("Script %s terminated abnormally"), name);
426 logger(LOG_ERR, _("System call `%s' failed: %s"), "system", strerror(errno));
440 static RETSIGTYPE sigterm_handler(int a)
442 logger(LOG_NOTICE, _("Got %s signal"), "TERM");
446 static RETSIGTYPE sigquit_handler(int a)
448 logger(LOG_NOTICE, _("Got %s signal"), "QUIT");
452 static RETSIGTYPE fatal_signal_square(int a)
454 logger(LOG_ERR, _("Got another fatal signal %d (%s): not restarting."), a,
460 static RETSIGTYPE fatal_signal_handler(int a)
462 struct sigaction act;
463 logger(LOG_ERR, _("Got fatal signal %d (%s)"), a, strsignal(a));
467 logger(LOG_NOTICE, _("Trying to re-execute in 5 seconds..."));
469 act.sa_handler = fatal_signal_square;
470 act.sa_mask = emptysigset;
472 sigaction(SIGSEGV, &act, NULL);
474 close_network_connections();
476 remove_pid(pidfilename);
477 execvp(g_argv[0], g_argv);
479 logger(LOG_NOTICE, _("Not restarting."));
484 static RETSIGTYPE sighup_handler(int a)
486 logger(LOG_NOTICE, _("Got %s signal"), "HUP");
490 static RETSIGTYPE sigint_handler(int a)
492 logger(LOG_NOTICE, _("Got %s signal"), "INT");
494 if(saved_debug_level != -1) {
495 logger(LOG_NOTICE, _("Reverting to old debug level (%d)"),
497 debug_level = saved_debug_level;
498 saved_debug_level = -1;
501 _("Temporarily setting debug level to 5. Kill me with SIGINT again to go back to level %d."),
503 saved_debug_level = debug_level;
508 static RETSIGTYPE sigalrm_handler(int a)
510 logger(LOG_NOTICE, _("Got %s signal"), "ALRM");
514 static RETSIGTYPE sigusr1_handler(int a)
519 static RETSIGTYPE sigusr2_handler(int a)
527 static RETSIGTYPE sigwinch_handler(int a)
532 static RETSIGTYPE unexpected_signal_handler(int a)
534 logger(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a));
538 static RETSIGTYPE ignore_signal_handler(int a)
540 ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Ignored signal %d (%s)"), a, strsignal(a));
545 void (*handler)(int);
547 {SIGHUP, sighup_handler},
548 {SIGTERM, sigterm_handler},
549 {SIGQUIT, sigquit_handler},
550 {SIGSEGV, fatal_signal_handler},
551 {SIGBUS, fatal_signal_handler},
552 {SIGILL, fatal_signal_handler},
553 {SIGPIPE, ignore_signal_handler},
554 {SIGINT, sigint_handler},
555 {SIGUSR1, sigusr1_handler},
556 {SIGUSR2, sigusr2_handler},
557 {SIGCHLD, ignore_signal_handler},
558 {SIGALRM, sigalrm_handler},
559 {SIGWINCH, sigwinch_handler},
564 void setup_signals(void)
568 struct sigaction act;
570 sigemptyset(&emptysigset);
571 act.sa_handler = NULL;
572 act.sa_mask = emptysigset;
575 /* Set a default signal handler for every signal, errors will be
577 for(i = 0; i < NSIG; i++) {
579 act.sa_handler = SIG_DFL;
581 act.sa_handler = unexpected_signal_handler;
582 sigaction(i, &act, NULL);
585 /* If we didn't detach, allow coredumps */
587 sighandlers[3].handler = SIG_DFL;
589 /* Then, for each known signal that we want to catch, assign a
590 handler to the signal, with error checking this time. */
591 for(i = 0; sighandlers[i].signal; i++) {
592 act.sa_handler = sighandlers[i].handler;
593 if(sigaction(sighandlers[i].signal, &act, NULL) < 0)
594 fprintf(stderr, _("Installing signal handler for signal %d (%s) failed: %s\n"),
595 sighandlers[i].signal, strsignal(sighandlers[i].signal),