tinc-vpn.org Git - tinc/blob - src/process.c

   1 /*
   2     process.c -- process management functions
   3     Copyright (C) 1999-2005 Ivo Timmermans,
   4                   2000-2006 Guus Sliepen <guus@tinc-vpn.org>
   5
   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.
  10
  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.
  15
  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.
  19
  20     $Id$
  21 */
  22
  23 #include "system.h"
  24
  25 #include "conf.h"
  26 #include "connection.h"
  27 #include "control.h"
  28 #include "device.h"
  29 #include "edge.h"
  30 #include "logger.h"
  31 #include "node.h"
  32 #include "process.h"
  33 #include "subnet.h"
  34 #include "utils.h"
  35 #include "xalloc.h"
  36
  37 /* If zero, don't detach from the terminal. */
  38 bool do_detach = true;
  39 bool sigalrm = false;
  40
  41 extern char *identname;
  42 extern char **g_argv;
  43 extern bool use_logfile;
  44
  45 sigset_t emptysigset;
  46
  47 static void memory_full(int size) {
  48         logger(LOG_ERR, _("Memory exhausted (couldn't allocate %d bytes), exitting."), size);
  49         cp_trace();
  50         exit(1);
  51 }
  52
  53 /* Some functions the less gifted operating systems might lack... */
  54
  55 #ifdef HAVE_MINGW
  56 extern char *identname;
  57 extern char *program_name;
  58 extern char **g_argv;
  59
  60 static SC_HANDLE manager = NULL;
  61 static SC_HANDLE service = NULL;
  62 static SERVICE_STATUS status = {0};
  63 static SERVICE_STATUS_HANDLE statushandle = 0;
  64
  65 bool install_service(void) {
  66         char command[4096] = "\"";
  67         char **argp;
  68         bool space;
  69         SERVICE_DESCRIPTION description = {"Virtual Private Network daemon"};
  70
  71         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
  72         if(!manager) {
  73                 logger(LOG_ERR, _("Could not open service manager: %s"), winerror(GetLastError()));
  74                 return false;
  75         }
  76
  77         if(!strchr(program_name, '\\')) {
  78                 GetCurrentDirectory(sizeof command - 1, command + 1);
  79                 strncat(command, "\\", sizeof command - strlen(command));
  80         }
  81
  82         strncat(command, program_name, sizeof command - strlen(command));
  83
  84         strncat(command, "\"", sizeof command - strlen(command));
  85
  86         for(argp = g_argv + 1; *argp; argp++) {
  87                 space = strchr(*argp, ' ');
  88                 strncat(command, " ", sizeof command - strlen(command));
  89
  90                 if(space)
  91                         strncat(command, "\"", sizeof command - strlen(command));
  92
  93                 strncat(command, *argp, sizeof command - strlen(command));
  94
  95                 if(space)
  96                         strncat(command, "\"", sizeof command - strlen(command));
  97         }
  98
  99         service = CreateService(manager, identname, identname,
 100                         SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, SERVICE_ERROR_NORMAL,
 101                         command, NULL, NULL, NULL, NULL, NULL);
 102
 103         if(!service) {
 104                 logger(LOG_ERR, _("Could not create %s service: %s"), identname, winerror(GetLastError()));
 105                 return false;
 106         }
 107
 108         ChangeServiceConfig2(service, SERVICE_CONFIG_DESCRIPTION, &description);
 109
 110         logger(LOG_INFO, _("%s service installed"), identname);
 111
 112         if(!StartService(service, 0, NULL))
 113                 logger(LOG_WARNING, _("Could not start %s service: %s"), identname, winerror(GetLastError()));
 114         else
 115                 logger(LOG_INFO, _("%s service started"), identname);
 116
 117         return true;
 118 }
 119
 120 bool remove_service(void) {
 121         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
 122         if(!manager) {
 123                 logger(LOG_ERR, _("Could not open service manager: %s"), winerror(GetLastError()));
 124                 return false;
 125         }
 126
 127         service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
 128
 129         if(!service) {
 130                 logger(LOG_ERR, _("Could not open %s service: %s"), identname, winerror(GetLastError()));
 131                 return false;
 132         }
 133
 134         if(!ControlService(service, SERVICE_CONTROL_STOP, &status))
 135                 logger(LOG_ERR, _("Could not stop %s service: %s"), identname, winerror(GetLastError()));
 136         else
 137                 logger(LOG_INFO, _("%s service stopped"), identname);
 138
 139         if(!DeleteService(service)) {
 140                 logger(LOG_ERR, _("Could not remove %s service: %s"), identname, winerror(GetLastError()));
 141                 return false;
 142         }
 143
 144         logger(LOG_INFO, _("%s service removed"), identname);
 145
 146         return true;
 147 }
 148
 149 DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID boe, LPVOID bah) {
 150         switch(request) {
 151                 case SERVICE_CONTROL_STOP:
 152                         logger(LOG_NOTICE, _("Got %s request"), "SERVICE_CONTROL_STOP");
 153                         break;
 154                 case SERVICE_CONTROL_SHUTDOWN:
 155                         logger(LOG_NOTICE, _("Got %s request"), "SERVICE_CONTROL_SHUTDOWN");
 156                         break;
 157                 default:
 158                         logger(LOG_WARNING, _("Got unexpected request %d"), request);
 159                         return ERROR_CALL_NOT_IMPLEMENTED;
 160         }
 161
 162         event_loopexit(NULL);
 163         status.dwWaitHint = 30000;
 164         status.dwCurrentState = SERVICE_STOP_PENDING;
 165         SetServiceStatus(statushandle, &status);
 166         return NO_ERROR;
 167 }
 168
 169 VOID WINAPI run_service(DWORD argc, LPTSTR* argv) {
 170         int err = 1;
 171         extern int main2(int argc, char **argv);
 172
 173
 174         status.dwServiceType = SERVICE_WIN32;
 175         status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
 176         status.dwWin32ExitCode = 0;
 177         status.dwServiceSpecificExitCode = 0;
 178         status.dwCheckPoint = 0;
 179
 180         statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
 181
 182         if (!statushandle) {
 183                 logger(LOG_ERR, _("System call `%s' failed: %s"), "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
 184                 err = 1;
 185         } else {
 186                 status.dwWaitHint = 30000;
 187                 status.dwCurrentState = SERVICE_START_PENDING;
 188                 SetServiceStatus(statushandle, &status);
 189
 190                 status.dwWaitHint = 0;
 191                 status.dwCurrentState = SERVICE_RUNNING;
 192                 SetServiceStatus(statushandle, &status);
 193
 194                 err = main2(argc, argv);
 195
 196                 status.dwWaitHint = 0;
 197                 status.dwCurrentState = SERVICE_STOPPED;
 198                 //status.dwWin32ExitCode = err;
 199                 SetServiceStatus(statushandle, &status);
 200         }
 201
 202         return;
 203 }
 204
 205 bool init_service(void) {
 206         SERVICE_TABLE_ENTRY services[] = {
 207                 {identname, run_service},
 208                 {NULL, NULL}
 209         };
 210
 211         if(!StartServiceCtrlDispatcher(services)) {
 212                 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
 213                         return false;
 214                 }
 215                 else
 216                         logger(LOG_ERR, _("System call `%s' failed: %s"), "StartServiceCtrlDispatcher", winerror(GetLastError()));
 217         }
 218
 219         return true;
 220 }
 221 #endif
 222
 223 /*
 224   Detach from current terminal
 225 */
 226 bool detach(void) {
 227         cp();
 228
 229         setup_signals();
 230
 231 #ifndef HAVE_MINGW
 232         closelogger();
 233 #endif
 234
 235         if(do_detach) {
 236 #ifndef HAVE_MINGW
 237                 if(daemon(0, 0)) {
 238                         fprintf(stderr, _("Couldn't detach from terminal: %s"),
 239                                         strerror(errno));
 240                         return false;
 241                 }
 242 #else
 243                 if(!statushandle)
 244                         exit(install_service());
 245 #endif
 246         }
 247
 248         openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
 249
 250         logger(LOG_NOTICE, _("tincd %s (%s %s) starting, debug level %d"),
 251                            VERSION, __DATE__, __TIME__, debug_level);
 252
 253         xalloc_fail_func = memory_full;
 254
 255         return true;
 256 }
 257
 258 bool execute_script(const char *name, char **envp) {
 259 #ifdef HAVE_SYSTEM
 260         int status, len;
 261         struct stat s;
 262         char *scriptname, *p;
 263         int i;
 264
 265         cp();
 266
 267 #ifndef HAVE_MINGW
 268         len = asprintf(&scriptname, "\"%s/%s\"", confbase, name);
 269 #else
 270         len = asprintf(&scriptname, "\"%s/%s.bat\"", confbase, name);
 271 #endif
 272         if(len < 0)
 273                 return false;
 274
 275         scriptname[len - 1] = '\0';
 276
 277         /* First check if there is a script */
 278
 279         if(stat(scriptname + 1, &s)) {
 280                 free(scriptname);
 281                 return true;
 282         }
 283
 284         ifdebug(STATUS) logger(LOG_INFO, _("Executing script %s"), name);
 285
 286 #ifdef HAVE_PUTENV
 287         /* Set environment */
 288
 289         for(i = 0; envp[i]; i++)
 290                 putenv(envp[i]);
 291 #endif
 292
 293         scriptname[len - 1] = '\"';
 294         status = system(scriptname);
 295
 296         free(scriptname);
 297
 298         /* Unset environment */
 299
 300         for(i = 0; envp[i]; i++) {
 301                 char *e = strchr(envp[i], '=');
 302                 if(e) {
 303                         p = alloca(e - envp[i] + 1);
 304                         strncpy(p, envp[i], e - envp[i]);
 305                         p[e - envp[i]] = '\0';
 306                         putenv(p);
 307                 }
 308         }
 309
 310 #ifdef WEXITSTATUS
 311         if(status != -1) {
 312                 if(WIFEXITED(status)) { /* Child exited by itself */
 313                         if(WEXITSTATUS(status)) {
 314                                 logger(LOG_ERR, _("Script %s exited with non-zero status %d"),
 315                                            name, WEXITSTATUS(status));
 316                                 return false;
 317                         }
 318                 } else if(WIFSIGNALED(status)) {        /* Child was killed by a signal */
 319                         logger(LOG_ERR, _("Script %s was killed by signal %d (%s)"),
 320                                    name, WTERMSIG(status), strsignal(WTERMSIG(status)));
 321                         return false;
 322                 } else {                        /* Something strange happened */
 323                         logger(LOG_ERR, _("Script %s terminated abnormally"), name);
 324                         return false;
 325                 }
 326         } else {
 327                 logger(LOG_ERR, _("System call `%s' failed: %s"), "system", strerror(errno));
 328                 return false;
 329         }
 330 #endif
 331 #endif
 332         return true;
 333 }
 334
 335
 336 /*
 337   Signal handlers.
 338 */
 339
 340 #ifndef HAVE_MINGW
 341 static RETSIGTYPE fatal_signal_square(int a) {
 342         logger(LOG_ERR, _("Got another fatal signal %d (%s): not restarting."), a,
 343                    strsignal(a));
 344         cp_trace();
 345         exit(1);
 346 }
 347
 348 static RETSIGTYPE fatal_signal_handler(int a) {
 349         struct sigaction act;
 350         logger(LOG_ERR, _("Got fatal signal %d (%s)"), a, strsignal(a));
 351         cp_trace();
 352
 353         if(do_detach) {
 354                 logger(LOG_NOTICE, _("Trying to re-execute in 5 seconds..."));
 355
 356                 act.sa_handler = fatal_signal_square;
 357                 act.sa_mask = emptysigset;
 358                 act.sa_flags = 0;
 359                 sigaction(SIGSEGV, &act, NULL);
 360
 361                 close_network_connections();
 362                 sleep(5);
 363                 exit_control();
 364                 execvp(g_argv[0], g_argv);
 365         } else {
 366                 logger(LOG_NOTICE, _("Not restarting."));
 367                 exit(1);
 368         }
 369 }
 370
 371 static RETSIGTYPE unexpected_signal_handler(int a) {
 372         logger(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a));
 373         cp_trace();
 374 }
 375
 376 static RETSIGTYPE ignore_signal_handler(int a) {
 377         ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Ignored signal %d (%s)"), a, strsignal(a));
 378 }
 379
 380 static struct {
 381         int signal;
 382         void (*handler)(int);
 383 } sighandlers[] = {
 384         {SIGSEGV, fatal_signal_handler},
 385         {SIGBUS, fatal_signal_handler},
 386         {SIGILL, fatal_signal_handler},
 387         {SIGPIPE, ignore_signal_handler},
 388         {SIGCHLD, ignore_signal_handler},
 389         {0, NULL}
 390 };
 391 #endif
 392
 393 void setup_signals(void) {
 394 #ifndef HAVE_MINGW
 395         int i;
 396         struct sigaction act;
 397
 398         sigemptyset(&emptysigset);
 399         act.sa_handler = NULL;
 400         act.sa_mask = emptysigset;
 401         act.sa_flags = 0;
 402
 403         /* Set a default signal handler for every signal, errors will be
 404            ignored. */
 405         for(i = 0; i < NSIG; i++) {
 406                 if(!do_detach)
 407                         act.sa_handler = SIG_DFL;
 408                 else
 409                         act.sa_handler = unexpected_signal_handler;
 410                 sigaction(i, &act, NULL);
 411         }
 412
 413         /* If we didn't detach, allow coredumps */
 414         if(!do_detach)
 415                 sighandlers[0].handler = SIG_DFL;
 416
 417         /* Then, for each known signal that we want to catch, assign a
 418            handler to the signal, with error checking this time. */
 419         for(i = 0; sighandlers[i].signal; i++) {
 420                 act.sa_handler = sighandlers[i].handler;
 421                 if(sigaction(sighandlers[i].signal, &act, NULL) < 0)
 422                         fprintf(stderr, _("Installing signal handler for signal %d (%s) failed: %s\n"),
 423                                         sighandlers[i].signal, strsignal(sighandlers[i].signal),
 424                                         strerror(errno));
 425         }
 426 #endif
 427 }