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

   1 /*
   2     process.c -- process management functions
   3     Copyright (C) 1999-2005 Ivo Timmermans,
   4                   2000-2013 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 "edge.h"
  27 #include "event.h"
  28 #include "logger.h"
  29 #include "names.h"
  30 #include "net.h"
  31 #include "node.h"
  32 #include "process.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 **g_argv;
  41 extern bool use_logfile;
  42
  43 /* Some functions the less gifted operating systems might lack... */
  44
  45 #ifdef HAVE_MINGW
  46 static SC_HANDLE manager = NULL;
  47 static SC_HANDLE service = NULL;
  48 static SERVICE_STATUS status = {0};
  49 static SERVICE_STATUS_HANDLE statushandle = 0;
  50
  51 static bool install_service(void) {
  52         char command[4096] = "\"";
  53         SERVICE_DESCRIPTION description = {"Virtual Private Network daemon"};
  54
  55         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
  56         if(!manager) {
  57                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open service manager: %s", winerror(GetLastError()));
  58                 return false;
  59         }
  60
  61         if(!strchr(program_name, '\\')) {
  62                 GetCurrentDirectory(sizeof command - 1, command + 1);
  63                 strncat(command, "\\", sizeof command - strlen(command));
  64         }
  65
  66         strncat(command, program_name, sizeof command - strlen(command));
  67
  68         strncat(command, "\"", sizeof command - strlen(command));
  69
  70         for(char **argp = g_argv + 1; *argp; argp++) {
  71                 char *space = strchr(*argp, ' ');
  72                 strncat(command, " ", sizeof command - strlen(command));
  73
  74                 if(space)
  75                         strncat(command, "\"", sizeof command - strlen(command));
  76
  77                 strncat(command, *argp, sizeof command - strlen(command));
  78
  79                 if(space)
  80                         strncat(command, "\"", sizeof command - strlen(command));
  81         }
  82
  83         service = CreateService(manager, identname, identname,
  84                         SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, SERVICE_ERROR_NORMAL,
  85                         command, NULL, NULL, NULL, NULL, NULL);
  86
  87         if(!service) {
  88                 DWORD lasterror = GetLastError();
  89                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not create %s service: %s", identname, winerror(lasterror));
  90                 if(lasterror != ERROR_SERVICE_EXISTS)
  91                         return false;
  92         }
  93
  94         if(service) {
  95                 ChangeServiceConfig2(service, SERVICE_CONFIG_DESCRIPTION, &description);
  96                 logger(DEBUG_ALWAYS, LOG_INFO, "%s service installed", identname);
  97         } else {
  98                 service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
  99         }
 100
 101         if(!StartService(service, 0, NULL))
 102                 logger(DEBUG_ALWAYS, LOG_WARNING, "Could not start %s service: %s", identname, winerror(GetLastError()));
 103         else
 104                 logger(DEBUG_ALWAYS, LOG_INFO, "%s service started", identname);
 105
 106         return true;
 107 }
 108
 109 DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID boe, LPVOID bah) {
 110         switch(request) {
 111                 case SERVICE_CONTROL_INTERROGATE:
 112                         SetServiceStatus(statushandle, &status);
 113                         return NO_ERROR;
 114                 case SERVICE_CONTROL_STOP:
 115                         logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_STOP");
 116                         break;
 117                 case SERVICE_CONTROL_SHUTDOWN:
 118                         logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_SHUTDOWN");
 119                         break;
 120                 default:
 121                         logger(DEBUG_ALWAYS, LOG_WARNING, "Got unexpected request %d", (int)request);
 122                         return ERROR_CALL_NOT_IMPLEMENTED;
 123         }
 124
 125         event_exit();
 126         status.dwWaitHint = 30000;
 127         status.dwCurrentState = SERVICE_STOP_PENDING;
 128         SetServiceStatus(statushandle, &status);
 129         return NO_ERROR;
 130 }
 131
 132 VOID WINAPI run_service(DWORD argc, LPTSTR* argv) {
 133         extern int main2(int argc, char **argv);
 134
 135         status.dwServiceType = SERVICE_WIN32;
 136         status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
 137         status.dwWin32ExitCode = 0;
 138         status.dwServiceSpecificExitCode = 0;
 139         status.dwCheckPoint = 0;
 140
 141         statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
 142
 143         if (!statushandle) {
 144                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
 145         } else {
 146                 status.dwWaitHint = 30000;
 147                 status.dwCurrentState = SERVICE_START_PENDING;
 148                 SetServiceStatus(statushandle, &status);
 149
 150                 status.dwWaitHint = 0;
 151                 status.dwCurrentState = SERVICE_RUNNING;
 152                 SetServiceStatus(statushandle, &status);
 153
 154                 main2(argc, argv);
 155
 156                 status.dwWaitHint = 0;
 157                 status.dwCurrentState = SERVICE_STOPPED;
 158                 SetServiceStatus(statushandle, &status);
 159         }
 160
 161         return;
 162 }
 163
 164 bool init_service(void) {
 165         SERVICE_TABLE_ENTRY services[] = {
 166                 {identname, run_service},
 167                 {NULL, NULL}
 168         };
 169
 170         if(!StartServiceCtrlDispatcher(services)) {
 171                 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
 172                         return false;
 173                 }
 174                 else
 175                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "StartServiceCtrlDispatcher", winerror(GetLastError()));
 176         }
 177
 178         return true;
 179 }
 180 #endif
 181
 182 /*
 183   Detach from current terminal
 184 */
 185 bool detach(void) {
 186 #ifndef HAVE_MINGW
 187         signal(SIGPIPE, SIG_IGN);
 188         signal(SIGUSR1, SIG_IGN);
 189         signal(SIGUSR2, SIG_IGN);
 190         signal(SIGWINCH, SIG_IGN);
 191
 192         closelogger();
 193 #endif
 194
 195         if(do_detach) {
 196 #ifndef HAVE_MINGW
 197                 if(daemon(0, 0)) {
 198                         logger(DEBUG_ALWAYS, LOG_ERR, "Couldn't detach from terminal: %s", strerror(errno));
 199                         return false;
 200                 }
 201 #else
 202                 if(!statushandle)
 203                         exit(!install_service());
 204 #endif
 205         }
 206
 207         openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
 208
 209         logger(DEBUG_ALWAYS, LOG_NOTICE, "tincd %s (%s %s) starting, debug level %d",
 210                            VERSION, __DATE__, __TIME__, debug_level);
 211
 212         return true;
 213 }
 214
 215