2 process.c -- process management functions
3 Copyright (C) 1999-2005 Ivo Timmermans,
4 2000-2006 Guus Sliepen <guus@tinc-vpn.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.
26 #include "connection.h"
37 /* If zero, don't detach from the terminal. */
38 bool do_detach = true;
41 extern char *identname;
42 extern char *pidfilename;
44 extern bool use_logfile;
48 static int saved_debug_level = -1;
50 static void memory_full(int size)
52 logger(LOG_ERR, _("Memory exhausted (couldn't allocate %d bytes), exitting."), size);
57 /* Some functions the less gifted operating systems might lack... */
60 extern char *identname;
61 extern char *program_name;
64 static SC_HANDLE manager = NULL;
65 static SC_HANDLE service = NULL;
66 static SERVICE_STATUS status = {0};
67 static SERVICE_STATUS_HANDLE statushandle = 0;
69 bool install_service(void) {
70 char command[4096] = "\"";
73 SERVICE_DESCRIPTION description = {"Virtual Private Network daemon"};
75 manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
77 logger(LOG_ERR, _("Could not open service manager: %s"), winerror(GetLastError()));
81 if(!strchr(program_name, '\\')) {
82 GetCurrentDirectory(sizeof command - 1, command + 1);
83 strncat(command, "\\", sizeof command - strlen(command));
86 strncat(command, program_name, sizeof command - strlen(command));
88 strncat(command, "\"", sizeof command - strlen(command));
90 for(argp = g_argv + 1; *argp; argp++) {
91 space = strchr(*argp, ' ');
92 strncat(command, " ", sizeof command - strlen(command));
95 strncat(command, "\"", sizeof command - strlen(command));
97 strncat(command, *argp, sizeof command - strlen(command));
100 strncat(command, "\"", sizeof command - strlen(command));
103 service = CreateService(manager, identname, identname,
104 SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, SERVICE_ERROR_NORMAL,
105 command, NULL, NULL, NULL, NULL, NULL);
108 logger(LOG_ERR, _("Could not create %s service: %s"), identname, winerror(GetLastError()));
112 ChangeServiceConfig2(service, SERVICE_CONFIG_DESCRIPTION, &description);
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");
158 case SERVICE_CONTROL_SHUTDOWN:
159 logger(LOG_NOTICE, _("Got %s request"), "SERVICE_CONTROL_SHUTDOWN");
162 logger(LOG_WARNING, _("Got unexpected request %d"), request);
163 return ERROR_CALL_NOT_IMPLEMENTED;
166 event_loopexit(NULL);
167 status.dwWaitHint = 30000;
168 status.dwCurrentState = SERVICE_STOP_PENDING;
169 SetServiceStatus(statushandle, &status);
173 VOID WINAPI run_service(DWORD argc, LPTSTR* argv)
176 extern int main2(int argc, char **argv);
179 status.dwServiceType = SERVICE_WIN32;
180 status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
181 status.dwWin32ExitCode = 0;
182 status.dwServiceSpecificExitCode = 0;
183 status.dwCheckPoint = 0;
185 statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
188 logger(LOG_ERR, _("System call `%s' failed: %s"), "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
191 status.dwWaitHint = 30000;
192 status.dwCurrentState = SERVICE_START_PENDING;
193 SetServiceStatus(statushandle, &status);
195 status.dwWaitHint = 0;
196 status.dwCurrentState = SERVICE_RUNNING;
197 SetServiceStatus(statushandle, &status);
199 err = main2(argc, argv);
201 status.dwWaitHint = 0;
202 status.dwCurrentState = SERVICE_STOPPED;
203 //status.dwWin32ExitCode = err;
204 SetServiceStatus(statushandle, &status);
210 bool init_service(void) {
211 SERVICE_TABLE_ENTRY services[] = {
212 {identname, run_service},
216 if(!StartServiceCtrlDispatcher(services)) {
217 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
221 logger(LOG_ERR, _("System call `%s' failed: %s"), "StartServiceCtrlDispatcher", winerror(GetLastError()));
230 check for an existing tinc for this net, and write pid to pidfile
232 static bool write_pidfile(void)
238 pid = check_pid(pidfilename);
242 fprintf(stderr, _("A tincd is already running for net `%s' with pid %ld.\n"),
245 fprintf(stderr, _("A tincd is already running with pid %ld.\n"), (long)pid);
249 /* if it's locked, write-protected, or whatever */
250 if(!write_pid(pidfilename)) {
251 fprintf(stderr, _("Could write pid file %s: %s\n"), pidfilename, strerror(errno));
260 kill older tincd for this net
262 bool kill_other(int signal)
269 pid = read_pid(pidfilename);
273 fprintf(stderr, _("No other tincd is running for net `%s'.\n"),
276 fprintf(stderr, _("No other tincd is running.\n"));
280 errno = 0; /* No error, sometimes errno is only changed on error */
282 /* ESRCH is returned when no process with that pid is found */
283 if(kill(pid, signal) && errno == ESRCH) {
285 fprintf(stderr, _("The tincd for net `%s' is no longer running. "),
288 fprintf(stderr, _("The tincd is no longer running. "));
290 fprintf(stderr, _("Removing stale lock file.\n"));
291 remove_pid(pidfilename);
296 return remove_service();
301 Detach from current terminal, write pidfile, kill parent
309 /* First check if we can open a fresh new pidfile */
315 /* If we succeeded in doing that, detach */
323 fprintf(stderr, _("Couldn't detach from terminal: %s"),
328 /* Now UPDATE the pid in the pidfile, because we changed it... */
330 if(!write_pid(pidfilename)) {
331 fprintf(stderr, _("Could not write pid file %s: %s\n"), pidfilename, strerror(errno));
336 exit(install_service());
340 openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
342 logger(LOG_NOTICE, _("tincd %s (%s %s) starting, debug level %d"),
343 VERSION, __DATE__, __TIME__, debug_level);
345 xalloc_fail_func = memory_full;
350 bool execute_script(const char *name, char **envp)
355 char *scriptname, *p;
361 len = asprintf(&scriptname, "\"%s/%s\"", confbase, name);
363 len = asprintf(&scriptname, "\"%s/%s.bat\"", confbase, name);
368 scriptname[len - 1] = '\0';
370 /* First check if there is a script */
372 if(stat(scriptname + 1, &s)) {
377 ifdebug(STATUS) logger(LOG_INFO, _("Executing script %s"), name);
380 /* Set environment */
382 for(i = 0; envp[i]; i++)
386 scriptname[len - 1] = '\"';
387 status = system(scriptname);
391 /* Unset environment */
393 for(i = 0; envp[i]; i++) {
394 char *e = strchr(envp[i], '=');
396 p = alloca(e - envp[i] + 1);
397 strncpy(p, envp[i], e - envp[i]);
398 p[e - envp[i]] = '\0';
405 if(WIFEXITED(status)) { /* Child exited by itself */
406 if(WEXITSTATUS(status)) {
407 logger(LOG_ERR, _("Script %s exited with non-zero status %d"),
408 name, WEXITSTATUS(status));
411 } else if(WIFSIGNALED(status)) { /* Child was killed by a signal */
412 logger(LOG_ERR, _("Script %s was killed by signal %d (%s)"),
413 name, WTERMSIG(status), strsignal(WTERMSIG(status)));
415 } else { /* Something strange happened */
416 logger(LOG_ERR, _("Script %s terminated abnormally"), name);
420 logger(LOG_ERR, _("System call `%s' failed: %s"), "system", strerror(errno));
434 static RETSIGTYPE fatal_signal_square(int a)
436 logger(LOG_ERR, _("Got another fatal signal %d (%s): not restarting."), a,
442 static RETSIGTYPE fatal_signal_handler(int a)
444 struct sigaction act;
445 logger(LOG_ERR, _("Got fatal signal %d (%s)"), a, strsignal(a));
449 logger(LOG_NOTICE, _("Trying to re-execute in 5 seconds..."));
451 act.sa_handler = fatal_signal_square;
452 act.sa_mask = emptysigset;
454 sigaction(SIGSEGV, &act, NULL);
456 close_network_connections();
458 remove_pid(pidfilename);
459 execvp(g_argv[0], g_argv);
461 logger(LOG_NOTICE, _("Not restarting."));
466 static RETSIGTYPE unexpected_signal_handler(int a)
468 logger(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a));
472 static RETSIGTYPE ignore_signal_handler(int a)
474 ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Ignored signal %d (%s)"), a, strsignal(a));
479 void (*handler)(int);
481 {SIGSEGV, fatal_signal_handler},
482 {SIGBUS, fatal_signal_handler},
483 {SIGILL, fatal_signal_handler},
484 {SIGPIPE, ignore_signal_handler},
485 {SIGCHLD, ignore_signal_handler},
490 void setup_signals(void)
494 struct sigaction act;
496 sigemptyset(&emptysigset);
497 act.sa_handler = NULL;
498 act.sa_mask = emptysigset;
501 /* Set a default signal handler for every signal, errors will be
503 for(i = 0; i < NSIG; i++) {
505 act.sa_handler = SIG_DFL;
507 act.sa_handler = unexpected_signal_handler;
508 sigaction(i, &act, NULL);
511 /* If we didn't detach, allow coredumps */
513 sighandlers[0].handler = SIG_DFL;
515 /* Then, for each known signal that we want to catch, assign a
516 handler to the signal, with error checking this time. */
517 for(i = 0; sighandlers[i].signal; i++) {
518 act.sa_handler = sighandlers[i].handler;
519 if(sigaction(sighandlers[i].signal, &act, NULL) < 0)
520 fprintf(stderr, _("Installing signal handler for signal %d (%s) failed: %s\n"),
521 sighandlers[i].signal, strsignal(sighandlers[i].signal),