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

   1 /*
   2     process.c -- process management functions
   3     Copyright (C) 1999-2005 Ivo Timmermans,
   4                   2000-2011 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 along
  17     with this program; if not, write to the Free Software Foundation, Inc.,
  18     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19 */
  20
  21 #include "system.h"
  22
  23 #include "conf.h"
  24 #include "connection.h"
  25 #include "control.h"
  26 #include "device.h"
  27 #include "edge.h"
  28 #include "logger.h"
  29 #include "node.h"
  30 #include "process.h"
  31 #include "subnet.h"
  32 #include "utils.h"
  33 #include "xalloc.h"
  34
  35 /* If zero, don't detach from the terminal. */
  36 bool do_detach = true;
  37 bool sigalrm = false;
  38
  39 extern char *identname;
  40 extern char **g_argv;
  41 extern bool use_logfile;
  42
  43 static void memory_full(int size) {
  44         logger(LOG_ERR, "Memory exhausted (couldn't allocate %d bytes), exitting.", size);
  45         exit(1);
  46 }
  47
  48 /* Some functions the less gifted operating systems might lack... */
  49
  50 #ifdef HAVE_MINGW
  51 extern char *identname;
  52 extern char *program_name;
  53 extern char **g_argv;
  54
  55 static SC_HANDLE manager = NULL;
  56 static SC_HANDLE service = NULL;
  57 static SERVICE_STATUS status = {0};
  58 static SERVICE_STATUS_HANDLE statushandle = 0;
  59
  60 bool install_service(void) {
  61         char command[4096] = "\"";
  62         char **argp;
  63         bool space;
  64         SERVICE_DESCRIPTION description = {"Virtual Private Network daemon"};
  65
  66         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
  67         if(!manager) {
  68                 logger(LOG_ERR, "Could not open service manager: %s", winerror(GetLastError()));
  69                 return false;
  70         }
  71
  72         if(!strchr(program_name, '\\')) {
  73                 GetCurrentDirectory(sizeof command - 1, command + 1);
  74                 strncat(command, "\\", sizeof command - strlen(command));
  75         }
  76
  77         strncat(command, program_name, sizeof command - strlen(command));
  78
  79         strncat(command, "\"", sizeof command - strlen(command));
  80
  81         for(argp = g_argv + 1; *argp; argp++) {
  82                 space = strchr(*argp, ' ');
  83                 strncat(command, " ", sizeof command - strlen(command));
  84
  85                 if(space)
  86                         strncat(command, "\"", sizeof command - strlen(command));
  87
  88                 strncat(command, *argp, sizeof command - strlen(command));
  89
  90                 if(space)
  91                         strncat(command, "\"", sizeof command - strlen(command));
  92         }
  93
  94         service = CreateService(manager, identname, identname,
  95                         SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, SERVICE_ERROR_NORMAL,
  96                         command, NULL, NULL, NULL, NULL, NULL);
  97
  98         if(!service) {
  99                 DWORD lasterror = GetLastError();
 100                 logger(LOG_ERR, "Could not create %s service: %s", identname, winerror(lasterror));
 101                 if(lasterror != ERROR_SERVICE_EXISTS)
 102                         return false;
 103         }
 104
 105         if(service) {
 106                 ChangeServiceConfig2(service, SERVICE_CONFIG_DESCRIPTION, &description);
 107                 logger(LOG_INFO, "%s service installed", identname);
 108         } else {
 109                 service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
 110         }
 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         setup_signals();
 231
 232 #ifndef HAVE_MINGW
 233         closelogger();
 234 #endif
 235
 236         if(do_detach) {
 237 #ifndef HAVE_MINGW
 238                 if(daemon(0, 0)) {
 239                         fprintf(stderr, "Couldn't detach from terminal: %s",
 240                                         strerror(errno));
 241                         return false;
 242                 }
 243 #else
 244                 if(!statushandle)
 245                         exit(install_service());
 246 #endif
 247         }
 248
 249         openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
 250
 251         logger(LOG_NOTICE, "tincd %s (%s %s) starting, debug level %d",
 252                            VERSION, __DATE__, __TIME__, debug_level);
 253
 254         xalloc_fail_func = memory_full;
 255
 256         return true;
 257 }
 258
 259 bool execute_script(const char *name, char **envp) {
 260 #ifdef HAVE_SYSTEM
 261         int status, len;
 262         char *scriptname;
 263         int i;
 264
 265 #ifndef HAVE_MINGW
 266         len = xasprintf(&scriptname, "\"%s/%s\"", confbase, name);
 267 #else
 268         len = xasprintf(&scriptname, "\"%s/%s.bat\"", confbase, name);
 269 #endif
 270         if(len < 0)
 271                 return false;
 272
 273         scriptname[len - 1] = '\0';
 274
 275 #ifndef HAVE_TUNEMU
 276         /* First check if there is a script */
 277
 278         if(access(scriptname + 1, F_OK)) {
 279                 free(scriptname);
 280                 return true;
 281         }
 282 #endif
 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                         char p[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 ignore_signal_handler(int a) {
 342         ifdebug(SCARY_THINGS) logger(LOG_DEBUG, "Ignored signal %d (%s)", a, strsignal(a));
 343 }
 344
 345 static struct {
 346         int signal;
 347         void (*handler)(int);
 348 } sighandlers[] = {
 349         {SIGPIPE, ignore_signal_handler},
 350         {SIGCHLD, ignore_signal_handler},
 351         {0, NULL}
 352 };
 353 #endif
 354
 355 void setup_signals(void) {
 356 #ifndef HAVE_MINGW
 357         int i;
 358         struct sigaction act = {NULL};
 359
 360         sigemptyset(&act.sa_mask);
 361
 362         for(i = 0; sighandlers[i].signal; i++) {
 363                 act.sa_handler = sighandlers[i].handler;
 364                 if(sigaction(sighandlers[i].signal, &act, NULL) < 0)
 365                         fprintf(stderr, "Installing signal handler for signal %d (%s) failed: %s\n",
 366                                         sighandlers[i].signal, strsignal(sighandlers[i].signal),
 367                                         strerror(errno));
 368         }
 369 #endif
 370 }