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 "net.h"
  30 #include "node.h"
  31 #include "process.h"
  32 #include "subnet.h"
  33 #include "utils.h"
  34 #include "xalloc.h"
  35
  36 /* If zero, don't detach from the terminal. */
  37 bool do_detach = true;
  38 bool sigalrm = false;
  39
  40 extern char *identname;
  41 extern char **g_argv;
  42 extern bool use_logfile;
  43
  44 /* Some functions the less gifted operating systems might lack... */
  45
  46 #ifdef HAVE_MINGW
  47 extern char *identname;
  48 extern char *program_name;
  49 extern char **g_argv;
  50
  51 static SC_HANDLE manager = NULL;
  52 static SC_HANDLE service = NULL;
  53 static SERVICE_STATUS status = {0};
  54 static SERVICE_STATUS_HANDLE statushandle = 0;
  55
  56 bool install_service(void) {
  57         char command[4096] = "\"";
  58         char **argp;
  59         bool space;
  60         SERVICE_DESCRIPTION description = {"Virtual Private Network daemon"};
  61
  62         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
  63         if(!manager) {
  64                 logger(LOG_ERR, "Could not open service manager: %s", winerror(GetLastError()));
  65                 return false;
  66         }
  67
  68         if(!strchr(program_name, '\\')) {
  69                 GetCurrentDirectory(sizeof command - 1, command + 1);
  70                 strncat(command, "\\", sizeof command - strlen(command));
  71         }
  72
  73         strncat(command, program_name, sizeof command - strlen(command));
  74
  75         strncat(command, "\"", sizeof command - strlen(command));
  76
  77         for(argp = g_argv + 1; *argp; argp++) {
  78                 space = strchr(*argp, ' ');
  79                 strncat(command, " ", sizeof command - strlen(command));
  80
  81                 if(space)
  82                         strncat(command, "\"", sizeof command - strlen(command));
  83
  84                 strncat(command, *argp, sizeof command - strlen(command));
  85
  86                 if(space)
  87                         strncat(command, "\"", sizeof command - strlen(command));
  88         }
  89
  90         service = CreateService(manager, identname, identname,
  91                         SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, SERVICE_ERROR_NORMAL,
  92                         command, NULL, NULL, NULL, NULL, NULL);
  93
  94         if(!service) {
  95                 DWORD lasterror = GetLastError();
  96                 logger(LOG_ERR, "Could not create %s service: %s", identname, winerror(lasterror));
  97                 if(lasterror != ERROR_SERVICE_EXISTS)
  98                         return false;
  99         }
 100
 101         if(service) {
 102                 ChangeServiceConfig2(service, SERVICE_CONFIG_DESCRIPTION, &description);
 103                 logger(LOG_INFO, "%s service installed", identname);
 104         } else {
 105                 service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
 106         }
 107
 108         if(!StartService(service, 0, NULL))
 109                 logger(LOG_WARNING, "Could not start %s service: %s", identname, winerror(GetLastError()));
 110         else
 111                 logger(LOG_INFO, "%s service started", identname);
 112
 113         return true;
 114 }
 115
 116 bool remove_service(void) {
 117         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
 118         if(!manager) {
 119                 logger(LOG_ERR, "Could not open service manager: %s", winerror(GetLastError()));
 120                 return false;
 121         }
 122
 123         service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
 124
 125         if(!service) {
 126                 logger(LOG_ERR, "Could not open %s service: %s", identname, winerror(GetLastError()));
 127                 return false;
 128         }
 129
 130         if(!ControlService(service, SERVICE_CONTROL_STOP, &status))
 131                 logger(LOG_ERR, "Could not stop %s service: %s", identname, winerror(GetLastError()));
 132         else
 133                 logger(LOG_INFO, "%s service stopped", identname);
 134
 135         if(!DeleteService(service)) {
 136                 logger(LOG_ERR, "Could not remove %s service: %s", identname, winerror(GetLastError()));
 137                 return false;
 138         }
 139
 140         logger(LOG_INFO, "%s service removed", identname);
 141
 142         return true;
 143 }
 144
 145 DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID boe, LPVOID bah) {
 146         switch(request) {
 147                 case SERVICE_CONTROL_INTERROGATE:
 148                         SetServiceStatus(statushandle, &status);
 149                         return NO_ERROR;
 150                 case SERVICE_CONTROL_STOP:
 151                         logger(LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_STOP");
 152                         break;
 153                 case SERVICE_CONTROL_SHUTDOWN:
 154                         logger(LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_SHUTDOWN");
 155                         break;
 156                 default:
 157                         logger(LOG_WARNING, "Got unexpected request %d", request);
 158                         return ERROR_CALL_NOT_IMPLEMENTED;
 159         }
 160
 161         event_loopexit(NULL);
 162         status.dwWaitHint = 30000;
 163         status.dwCurrentState = SERVICE_STOP_PENDING;
 164         SetServiceStatus(statushandle, &status);
 165         return NO_ERROR;
 166 }
 167
 168 VOID WINAPI run_service(DWORD argc, LPTSTR* argv) {
 169         int err = 1;
 170         extern int main2(int argc, char **argv);
 171
 172
 173         status.dwServiceType = SERVICE_WIN32;
 174         status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
 175         status.dwWin32ExitCode = 0;
 176         status.dwServiceSpecificExitCode = 0;
 177         status.dwCheckPoint = 0;
 178
 179         statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
 180
 181         if (!statushandle) {
 182                 logger(LOG_ERR, "System call `%s' failed: %s", "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
 183                 err = 1;
 184         } else {
 185                 status.dwWaitHint = 30000;
 186                 status.dwCurrentState = SERVICE_START_PENDING;
 187                 SetServiceStatus(statushandle, &status);
 188
 189                 status.dwWaitHint = 0;
 190                 status.dwCurrentState = SERVICE_RUNNING;
 191                 SetServiceStatus(statushandle, &status);
 192
 193                 err = main2(argc, argv);
 194
 195                 status.dwWaitHint = 0;
 196                 status.dwCurrentState = SERVICE_STOPPED;
 197                 //status.dwWin32ExitCode = err;
 198                 SetServiceStatus(statushandle, &status);
 199         }
 200
 201         return;
 202 }
 203
 204 bool init_service(void) {
 205         SERVICE_TABLE_ENTRY services[] = {
 206                 {identname, run_service},
 207                 {NULL, NULL}
 208         };
 209
 210         if(!StartServiceCtrlDispatcher(services)) {
 211                 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
 212                         return false;
 213                 }
 214                 else
 215                         logger(LOG_ERR, "System call `%s' failed: %s", "StartServiceCtrlDispatcher", winerror(GetLastError()));
 216         }
 217
 218         return true;
 219 }
 220 #endif
 221
 222 /*
 223   Detach from current terminal
 224 */
 225 bool detach(void) {
 226 #ifndef HAVE_MINGW
 227         signal(SIGALRM, SIG_IGN);
 228         signal(SIGPIPE, SIG_IGN);
 229         signal(SIGUSR1, SIG_IGN);
 230         signal(SIGUSR2, SIG_IGN);
 231         signal(SIGWINCH, SIG_IGN);
 232
 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         return true;
 255 }
 256
 257 bool execute_script(const char *name, char **envp) {
 258 #ifdef HAVE_SYSTEM
 259         int status, len;
 260         char *scriptname;
 261         int i;
 262
 263 #ifndef HAVE_MINGW
 264         len = xasprintf(&scriptname, "\"%s/%s\"", confbase, name);
 265 #else
 266         len = xasprintf(&scriptname, "\"%s/%s.bat\"", confbase, name);
 267 #endif
 268         if(len < 0)
 269                 return false;
 270
 271         scriptname[len - 1] = '\0';
 272
 273 #ifndef HAVE_TUNEMU
 274         /* First check if there is a script */
 275
 276         if(access(scriptname + 1, F_OK)) {
 277                 free(scriptname);
 278                 return true;
 279         }
 280 #endif
 281
 282         ifdebug(STATUS) logger(LOG_INFO, "Executing script %s", name);
 283
 284 #ifdef HAVE_PUTENV
 285         /* Set environment */
 286
 287         for(i = 0; envp[i]; i++)
 288                 putenv(envp[i]);
 289 #endif
 290
 291         scriptname[len - 1] = '\"';
 292         status = system(scriptname);
 293
 294         free(scriptname);
 295
 296         /* Unset environment */
 297
 298         for(i = 0; envp[i]; i++) {
 299                 char *e = strchr(envp[i], '=');
 300                 if(e) {
 301                         char p[e - envp[i] + 1];
 302                         strncpy(p, envp[i], e - envp[i]);
 303                         p[e - envp[i]] = '\0';
 304                         putenv(p);
 305                 }
 306         }
 307
 308 #ifdef WEXITSTATUS
 309         if(status != -1) {
 310                 if(WIFEXITED(status)) { /* Child exited by itself */
 311                         if(WEXITSTATUS(status)) {
 312                                 logger(LOG_ERR, "Script %s exited with non-zero status %d",
 313                                            name, WEXITSTATUS(status));
 314                                 return false;
 315                         }
 316                 } else if(WIFSIGNALED(status)) {        /* Child was killed by a signal */
 317                         logger(LOG_ERR, "Script %s was killed by signal %d (%s)",
 318                                    name, WTERMSIG(status), strsignal(WTERMSIG(status)));
 319                         return false;
 320                 } else {                        /* Something strange happened */
 321                         logger(LOG_ERR, "Script %s terminated abnormally", name);
 322                         return false;
 323                 }
 324         } else {
 325                 logger(LOG_ERR, "System call `%s' failed: %s", "system", strerror(errno));
 326                 return false;
 327         }
 328 #endif
 329 #endif
 330         return true;
 331 }