git.meshlink.io Git - meshlink/blob - src/process.c

   1 /*
   2     process.c -- process management functions
   3     Copyright (C) 1999-2005 Ivo Timmermans,
   4                   2000-2007 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_INTERROGATE:
 152                         SetServiceStatus(statushandle, &status);
 153                         return NO_ERROR;
 154                 case SERVICE_CONTROL_STOP:
 155                         logger(LOG_NOTICE, _("Got %s request"), "SERVICE_CONTROL_STOP");
 156                         break;
 157                 case SERVICE_CONTROL_SHUTDOWN:
 158                         logger(LOG_NOTICE, _("Got %s request"), "SERVICE_CONTROL_SHUTDOWN");
 159                         break;
 160                 default:
 161                         logger(LOG_WARNING, _("Got unexpected request %d"), request);
 162                         return ERROR_CALL_NOT_IMPLEMENTED;
 163         }
 164
 165         event_loopexit(NULL);
 166         status.dwWaitHint = 30000;
 167         status.dwCurrentState = SERVICE_STOP_PENDING;
 168         SetServiceStatus(statushandle, &status);
 169         return NO_ERROR;
 170 }
 171
 172 VOID WINAPI run_service(DWORD argc, LPTSTR* argv) {
 173         int err = 1;
 174         extern int main2(int argc, char **argv);
 175
 176
 177         status.dwServiceType = SERVICE_WIN32;
 178         status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
 179         status.dwWin32ExitCode = 0;
 180         status.dwServiceSpecificExitCode = 0;
 181         status.dwCheckPoint = 0;
 182
 183         statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
 184
 185         if (!statushandle) {
 186                 logger(LOG_ERR, _("System call `%s' failed: %s"), "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
 187                 err = 1;
 188         } else {
 189                 status.dwWaitHint = 30000;
 190                 status.dwCurrentState = SERVICE_START_PENDING;
 191                 SetServiceStatus(statushandle, &status);
 192
 193                 status.dwWaitHint = 0;
 194                 status.dwCurrentState = SERVICE_RUNNING;
 195                 SetServiceStatus(statushandle, &status);
 196
 197                 err = main2(argc, argv);
 198
 199                 status.dwWaitHint = 0;
 200                 status.dwCurrentState = SERVICE_STOPPED;
 201                 //status.dwWin32ExitCode = err;
 202                 SetServiceStatus(statushandle, &status);
 203         }
 204
 205         return;
 206 }
 207
 208 bool init_service(void) {
 209         SERVICE_TABLE_ENTRY services[] = {
 210                 {identname, run_service},
 211                 {NULL, NULL}
 212         };
 213
 214         if(!StartServiceCtrlDispatcher(services)) {
 215                 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
 216                         return false;
 217                 }
 218                 else
 219                         logger(LOG_ERR, _("System call `%s' failed: %s"), "StartServiceCtrlDispatcher", winerror(GetLastError()));
 220         }
 221
 222         return true;
 223 }
 224 #endif
 225
 226 /*
 227   Detach from current terminal
 228 */
 229 bool detach(void) {
 230         cp();
 231
 232         setup_signals();
 233
 234 #ifndef HAVE_MINGW
 235         closelogger();
 236 #endif
 237
 238         if(do_detach) {
 239 #ifndef HAVE_MINGW
 240                 if(daemon(0, 0)) {
 241                         fprintf(stderr, _("Couldn't detach from terminal: %s"),
 242                                         strerror(errno));
 243                         return false;
 244                 }
 245 #else
 246                 if(!statushandle)
 247                         exit(install_service());
 248 #endif
 249         }
 250
 251         openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
 252
 253         logger(LOG_NOTICE, _("tincd %s (%s %s) starting, debug level %d"),
 254                            VERSION, __DATE__, __TIME__, debug_level);
 255
 256         xalloc_fail_func = memory_full;
 257
 258         return true;
 259 }
 260
 261 bool execute_script(const char *name, char **envp) {
 262 #ifdef HAVE_SYSTEM
 263         int status, len;
 264         struct stat s;
 265         char *scriptname, *p;
 266         int i;
 267
 268         cp();
 269
 270 #ifndef HAVE_MINGW
 271         len = asprintf(&scriptname, "\"%s/%s\"", confbase, name);
 272 #else
 273         len = asprintf(&scriptname, "\"%s/%s.bat\"", confbase, name);
 274 #endif
 275         if(len < 0)
 276                 return false;
 277
 278         scriptname[len - 1] = '\0';
 279
 280         /* First check if there is a script */
 281
 282         if(stat(scriptname + 1, &s)) {
 283                 free(scriptname);
 284                 return true;
 285         }
 286
 287         ifdebug(STATUS) logger(LOG_INFO, _("Executing script %s"), name);
 288
 289 #ifdef HAVE_PUTENV
 290         /* Set environment */
 291
 292         for(i = 0; envp[i]; i++)
 293                 putenv(envp[i]);
 294 #endif
 295
 296         scriptname[len - 1] = '\"';
 297         status = system(scriptname);
 298
 299         free(scriptname);
 300
 301         /* Unset environment */
 302
 303         for(i = 0; envp[i]; i++) {
 304                 char *e = strchr(envp[i], '=');
 305                 if(e) {
 306                         p = alloca(e - envp[i] + 1);
 307                         strncpy(p, envp[i], e - envp[i]);
 308                         p[e - envp[i]] = '\0';
 309                         putenv(p);
 310                 }
 311         }
 312
 313 #ifdef WEXITSTATUS
 314         if(status != -1) {
 315                 if(WIFEXITED(status)) { /* Child exited by itself */
 316                         if(WEXITSTATUS(status)) {
 317                                 logger(LOG_ERR, _("Script %s exited with non-zero status %d"),
 318                                            name, WEXITSTATUS(status));
 319                                 return false;
 320                         }
 321                 } else if(WIFSIGNALED(status)) {        /* Child was killed by a signal */
 322                         logger(LOG_ERR, _("Script %s was killed by signal %d (%s)"),
 323                                    name, WTERMSIG(status), strsignal(WTERMSIG(status)));
 324                         return false;
 325                 } else {                        /* Something strange happened */
 326                         logger(LOG_ERR, _("Script %s terminated abnormally"), name);
 327                         return false;
 328                 }
 329         } else {
 330                 logger(LOG_ERR, _("System call `%s' failed: %s"), "system", strerror(errno));
 331                 return false;
 332         }
 333 #endif
 334 #endif
 335         return true;
 336 }
 337
 338
 339 /*
 340   Signal handlers.
 341 */
 342
 343 #ifndef HAVE_MINGW
 344 static RETSIGTYPE fatal_signal_square(int a) {
 345         logger(LOG_ERR, _("Got another fatal signal %d (%s): not restarting."), a,
 346                    strsignal(a));
 347         cp_trace();
 348         exit(1);
 349 }
 350
 351 static RETSIGTYPE fatal_signal_handler(int a) {
 352         struct sigaction act;
 353         logger(LOG_ERR, _("Got fatal signal %d (%s)"), a, strsignal(a));
 354         cp_trace();
 355
 356         if(do_detach) {
 357                 logger(LOG_NOTICE, _("Trying to re-execute in 5 seconds..."));
 358
 359                 act.sa_handler = fatal_signal_square;
 360                 act.sa_mask = emptysigset;
 361                 act.sa_flags = 0;
 362                 sigaction(SIGSEGV, &act, NULL);
 363
 364                 close_network_connections();
 365                 sleep(5);
 366                 exit_control();
 367                 execvp(g_argv[0], g_argv);
 368         } else {
 369                 logger(LOG_NOTICE, _("Not restarting."));
 370                 exit(1);
 371         }
 372 }
 373
 374 static RETSIGTYPE unexpected_signal_handler(int a) {
 375         logger(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a));
 376         cp_trace();
 377 }
 378
 379 static RETSIGTYPE ignore_signal_handler(int a) {
 380         ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Ignored signal %d (%s)"), a, strsignal(a));
 381 }
 382
 383 static struct {
 384         int signal;
 385         void (*handler)(int);
 386 } sighandlers[] = {
 387         {SIGSEGV, fatal_signal_handler},
 388         {SIGBUS, fatal_signal_handler},
 389         {SIGILL, fatal_signal_handler},
 390         {SIGPIPE, ignore_signal_handler},
 391         {SIGCHLD, ignore_signal_handler},
 392         {0, NULL}
 393 };
 394 #endif
 395
 396 void setup_signals(void) {
 397 #ifndef HAVE_MINGW
 398         int i;
 399         struct sigaction act;
 400
 401         sigemptyset(&emptysigset);
 402         act.sa_handler = NULL;
 403         act.sa_mask = emptysigset;
 404         act.sa_flags = 0;
 405
 406         /* Set a default signal handler for every signal, errors will be
 407            ignored. */
 408         for(i = 0; i < NSIG; i++) {
 409                 if(!do_detach)
 410                         act.sa_handler = SIG_DFL;
 411                 else
 412                         act.sa_handler = unexpected_signal_handler;
 413                 sigaction(i, &act, NULL);
 414         }
 415
 416         /* If we didn't detach, allow coredumps */
 417         if(!do_detach)
 418                 sighandlers[0].handler = SIG_DFL;
 419
 420         /* Then, for each known signal that we want to catch, assign a
 421            handler to the signal, with error checking this time. */
 422         for(i = 0; sighandlers[i].signal; i++) {
 423                 act.sa_handler = sighandlers[i].handler;
 424                 if(sigaction(sighandlers[i].signal, &act, NULL) < 0)
 425                         fprintf(stderr, _("Installing signal handler for signal %d (%s) failed: %s\n"),
 426                                         sighandlers[i].signal, strsignal(sighandlers[i].signal),
 427                                         strerror(errno));
 428         }
 429 #endif
 430 }