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 static 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, LOG_WARNING, "Could not start %s service: %s", identname, winerror(GetLastError()));
 110         else
 111                 logger(DEBUG_ALWAYS, LOG_INFO, "%s service started", identname);
 112
 113         return true;
 114 }
 115
 116 DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID boe, LPVOID bah) {
 117         switch(request) {
 118                 case SERVICE_CONTROL_INTERROGATE:
 119                         SetServiceStatus(statushandle, &status);
 120                         return NO_ERROR;
 121                 case SERVICE_CONTROL_STOP:
 122                         logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_STOP");
 123                         break;
 124                 case SERVICE_CONTROL_SHUTDOWN:
 125                         logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_SHUTDOWN");
 126                         break;
 127                 default:
 128                         logger(DEBUG_ALWAYS, LOG_WARNING, "Got unexpected request %d", request);
 129                         return ERROR_CALL_NOT_IMPLEMENTED;
 130         }
 131
 132         event_loopexit(NULL);
 133         status.dwWaitHint = 30000;
 134         status.dwCurrentState = SERVICE_STOP_PENDING;
 135         SetServiceStatus(statushandle, &status);
 136         return NO_ERROR;
 137 }
 138
 139 VOID WINAPI run_service(DWORD argc, LPTSTR* argv) {
 140         int err = 1;
 141         extern int main2(int argc, char **argv);
 142
 143
 144         status.dwServiceType = SERVICE_WIN32;
 145         status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
 146         status.dwWin32ExitCode = 0;
 147         status.dwServiceSpecificExitCode = 0;
 148         status.dwCheckPoint = 0;
 149
 150         statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
 151
 152         if (!statushandle) {
 153                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
 154                 err = 1;
 155         } else {
 156                 status.dwWaitHint = 30000;
 157                 status.dwCurrentState = SERVICE_START_PENDING;
 158                 SetServiceStatus(statushandle, &status);
 159
 160                 status.dwWaitHint = 0;
 161                 status.dwCurrentState = SERVICE_RUNNING;
 162                 SetServiceStatus(statushandle, &status);
 163
 164                 err = main2(argc, argv);
 165
 166                 status.dwWaitHint = 0;
 167                 status.dwCurrentState = SERVICE_STOPPED;
 168                 //status.dwWin32ExitCode = err;
 169                 SetServiceStatus(statushandle, &status);
 170         }
 171
 172         return;
 173 }
 174
 175 bool init_service(void) {
 176         SERVICE_TABLE_ENTRY services[] = {
 177                 {identname, run_service},
 178                 {NULL, NULL}
 179         };
 180
 181         if(!StartServiceCtrlDispatcher(services)) {
 182                 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
 183                         return false;
 184                 }
 185                 else
 186                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "StartServiceCtrlDispatcher", winerror(GetLastError()));
 187         }
 188
 189         return true;
 190 }
 191 #endif
 192
 193 /*
 194   Detach from current terminal
 195 */
 196 bool detach(void) {
 197 #ifndef HAVE_MINGW
 198         signal(SIGPIPE, SIG_IGN);
 199         signal(SIGUSR1, SIG_IGN);
 200         signal(SIGUSR2, SIG_IGN);
 201         signal(SIGWINCH, SIG_IGN);
 202
 203         closelogger();
 204 #endif
 205
 206         if(do_detach) {
 207 #ifndef HAVE_MINGW
 208                 if(daemon(0, 0)) {
 209                         fprintf(stderr, "Couldn't detach from terminal: %s",
 210                                         strerror(errno));
 211                         return false;
 212                 }
 213 #else
 214                 if(!statushandle)
 215                         exit(!install_service());
 216 #endif
 217         }
 218
 219         openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
 220
 221         logger(DEBUG_ALWAYS, LOG_NOTICE, "tincd %s (%s %s) starting, debug level %d",
 222                            VERSION, __DATE__, __TIME__, debug_level);
 223
 224         return true;
 225 }
 226
 227 bool execute_script(const char *name, char **envp) {
 228 #ifdef HAVE_SYSTEM
 229         int status, len;
 230         char *scriptname;
 231         int i;
 232         char *interpreter = NULL;
 233
 234 #ifndef HAVE_MINGW
 235         len = xasprintf(&scriptname, "\"%s" SLASH "%s\"", confbase, name);
 236 #else
 237         len = xasprintf(&scriptname, "\"%s" SLASH "%s.bat\"", confbase, name);
 238 #endif
 239         if(len < 0)
 240                 return false;
 241
 242         scriptname[len - 1] = '\0';
 243
 244 #ifndef HAVE_TUNEMU
 245         /* First check if there is a script */
 246
 247         if(access(scriptname + 1, F_OK)) {
 248                 free(scriptname);
 249                 return true;
 250         }
 251 #endif
 252
 253         // Custom scripts interpreter
 254         if(get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &interpreter)) {
 255                 // Force custom scripts interpreter allowing execution of scripts on android without execution flag (such as on /sdcard)
 256                 free(scriptname);
 257                 len = xasprintf(&scriptname, "%s \"%s/%s\"", interpreter, confbase, name);
 258                 free(interpreter);
 259                 if(len < 0)
 260                         return false;
 261         }
 262
 263         logger(DEBUG_STATUS, LOG_INFO, "Executing script %s", name);
 264
 265
 266 #ifdef HAVE_PUTENV
 267         /* Set environment */
 268
 269         for(i = 0; envp[i]; i++)
 270                 putenv(envp[i]);
 271 #endif
 272
 273         scriptname[len - 1] = '\"';
 274         status = system(scriptname);
 275
 276         free(scriptname);
 277
 278         /* Unset environment */
 279
 280         for(i = 0; envp[i]; i++) {
 281                 char *e = strchr(envp[i], '=');
 282                 if(e) {
 283                         char p[e - envp[i] + 1];
 284                         strncpy(p, envp[i], e - envp[i]);
 285                         p[e - envp[i]] = '\0';
 286                         putenv(p);
 287                 }
 288         }
 289
 290 #ifdef WEXITSTATUS
 291         if(status != -1) {
 292                 if(WIFEXITED(status)) { /* Child exited by itself */
 293                         if(WEXITSTATUS(status)) {
 294                                 logger(DEBUG_ALWAYS, LOG_ERR, "Script %s exited with non-zero status %d",
 295                                            name, WEXITSTATUS(status));
 296                                 return false;
 297                         }
 298                 } else if(WIFSIGNALED(status)) {        /* Child was killed by a signal */
 299                         logger(DEBUG_ALWAYS, LOG_ERR, "Script %s was killed by signal %d (%s)",
 300                                    name, WTERMSIG(status), strsignal(WTERMSIG(status)));
 301                         return false;
 302                 } else {                        /* Something strange happened */
 303                         logger(DEBUG_ALWAYS, LOG_ERR, "Script %s terminated abnormally", name);
 304                         return false;
 305                 }
 306         } else {
 307                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "system", strerror(errno));
 308                 return false;
 309         }
 310 #endif
 311 #endif
 312         return true;
 313 }