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 "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 **g_argv;
  42 extern bool use_logfile;
  43
  44 /* Some functions the less gifted operating systems might lack... */
  45
  46 #ifdef HAVE_MINGW
  47 static SC_HANDLE manager = NULL;
  48 static SC_HANDLE service = NULL;
  49 static SERVICE_STATUS status = {0};
  50 static SERVICE_STATUS_HANDLE statushandle = 0;
  51
  52 static bool install_service(void) {
  53         char command[4096] = "\"";
  54         SERVICE_DESCRIPTION description = {"Virtual Private Network daemon"};
  55
  56         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
  57         if(!manager) {
  58                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open service manager: %s", winerror(GetLastError()));
  59                 return false;
  60         }
  61
  62         if(!strchr(program_name, '\\')) {
  63                 GetCurrentDirectory(sizeof command - 1, command + 1);
  64                 strncat(command, "\\", sizeof command - strlen(command));
  65         }
  66
  67         strncat(command, program_name, sizeof command - strlen(command));
  68
  69         strncat(command, "\"", sizeof command - strlen(command));
  70
  71         for(char **argp = g_argv + 1; *argp; argp++) {
  72                 char *space = strchr(*argp, ' ');
  73                 strncat(command, " ", sizeof command - strlen(command));
  74
  75                 if(space)
  76                         strncat(command, "\"", sizeof command - strlen(command));
  77
  78                 strncat(command, *argp, sizeof command - strlen(command));
  79
  80                 if(space)
  81                         strncat(command, "\"", sizeof command - strlen(command));
  82         }
  83
  84         service = CreateService(manager, identname, identname,
  85                         SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, SERVICE_ERROR_NORMAL,
  86                         command, NULL, NULL, NULL, NULL, NULL);
  87
  88         if(!service) {
  89                 DWORD lasterror = GetLastError();
  90                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not create %s service: %s", identname, winerror(lasterror));
  91                 if(lasterror != ERROR_SERVICE_EXISTS)
  92                         return false;
  93         }
  94
  95         if(service) {
  96                 ChangeServiceConfig2(service, SERVICE_CONFIG_DESCRIPTION, &description);
  97                 logger(DEBUG_ALWAYS, LOG_INFO, "%s service installed", identname);
  98         } else {
  99                 service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
 100         }
 101
 102         if(!StartService(service, 0, NULL))
 103                 logger(DEBUG_ALWAYS, LOG_WARNING, "Could not start %s service: %s", identname, winerror(GetLastError()));
 104         else
 105                 logger(DEBUG_ALWAYS, LOG_INFO, "%s service started", identname);
 106
 107         return true;
 108 }
 109
 110 DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID boe, LPVOID bah) {
 111         switch(request) {
 112                 case SERVICE_CONTROL_INTERROGATE:
 113                         SetServiceStatus(statushandle, &status);
 114                         return NO_ERROR;
 115                 case SERVICE_CONTROL_STOP:
 116                         logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_STOP");
 117                         break;
 118                 case SERVICE_CONTROL_SHUTDOWN:
 119                         logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_SHUTDOWN");
 120                         break;
 121                 default:
 122                         logger(DEBUG_ALWAYS, LOG_WARNING, "Got unexpected request %d", (int)request);
 123                         return ERROR_CALL_NOT_IMPLEMENTED;
 124         }
 125
 126         event_exit();
 127         status.dwWaitHint = 30000;
 128         status.dwCurrentState = SERVICE_STOP_PENDING;
 129         SetServiceStatus(statushandle, &status);
 130         return NO_ERROR;
 131 }
 132
 133 VOID WINAPI run_service(DWORD argc, LPTSTR* argv) {
 134         extern int main2(int argc, char **argv);
 135
 136         status.dwServiceType = SERVICE_WIN32;
 137         status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
 138         status.dwWin32ExitCode = 0;
 139         status.dwServiceSpecificExitCode = 0;
 140         status.dwCheckPoint = 0;
 141
 142         statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
 143
 144         if (!statushandle) {
 145                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
 146         } else {
 147                 status.dwWaitHint = 30000;
 148                 status.dwCurrentState = SERVICE_START_PENDING;
 149                 SetServiceStatus(statushandle, &status);
 150
 151                 status.dwWaitHint = 0;
 152                 status.dwCurrentState = SERVICE_RUNNING;
 153                 SetServiceStatus(statushandle, &status);
 154
 155                 main2(argc, argv);
 156
 157                 status.dwWaitHint = 0;
 158                 status.dwCurrentState = SERVICE_STOPPED;
 159                 SetServiceStatus(statushandle, &status);
 160         }
 161
 162         return;
 163 }
 164
 165 bool init_service(void) {
 166         SERVICE_TABLE_ENTRY services[] = {
 167                 {identname, run_service},
 168                 {NULL, NULL}
 169         };
 170
 171         if(!StartServiceCtrlDispatcher(services)) {
 172                 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
 173                         return false;
 174                 }
 175                 else
 176                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "StartServiceCtrlDispatcher", winerror(GetLastError()));
 177         }
 178
 179         return true;
 180 }
 181 #endif
 182
 183 /*
 184   Detach from current terminal
 185 */
 186 bool detach(void) {
 187 #ifndef HAVE_MINGW
 188         signal(SIGPIPE, SIG_IGN);
 189         signal(SIGUSR1, SIG_IGN);
 190         signal(SIGUSR2, SIG_IGN);
 191         signal(SIGWINCH, SIG_IGN);
 192
 193         closelogger();
 194 #endif
 195
 196         if(do_detach) {
 197 #ifndef HAVE_MINGW
 198                 if(daemon(0, 0)) {
 199                         logger(DEBUG_ALWAYS, LOG_ERR, "Couldn't detach from terminal: %s", strerror(errno));
 200                         return false;
 201                 }
 202 #else
 203                 if(!statushandle)
 204                         exit(!install_service());
 205 #endif
 206         }
 207
 208         openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
 209
 210         logger(DEBUG_ALWAYS, LOG_NOTICE, "tincd %s (%s %s) starting, debug level %d",
 211                            VERSION, __DATE__, __TIME__, debug_level);
 212
 213         return true;
 214 }
 215
 216