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