tinc-vpn.org Git - tinc/blob - src/process.c

   1 /*
   2     process.c -- process management functions
   3     Copyright (C) 1999-2005 Ivo Timmermans,
   4                   2000-2013 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 "device.h"
  27 #include "edge.h"
  28 #include "event.h"
  29 #include "logger.h"
  30 #include "names.h"
  31 #include "net.h"
  32 #include "node.h"
  33 #include "process.h"
  34 #include "subnet.h"
  35 #include "utils.h"
  36 #include "xalloc.h"
  37
  38 /* If zero, don't detach from the terminal. */
  39 bool do_detach = true;
  40 bool sigalrm = false;
  41
  42 extern char **g_argv;
  43 extern bool use_logfile;
  44 extern bool use_syslog;
  45
  46 /* Some functions the less gifted operating systems might lack... */
  47
  48 #ifdef HAVE_MINGW
  49 static SC_HANDLE manager = NULL;
  50 static SC_HANDLE service = NULL;
  51 static SERVICE_STATUS status = {0};
  52 static SERVICE_STATUS_HANDLE statushandle = 0;
  53
  54 static bool install_service(void) {
  55         char command[4096] = "\"";
  56         SERVICE_DESCRIPTION description = {"Virtual Private Network daemon"};
  57
  58         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
  59         if(!manager) {
  60                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open service manager: %s", winerror(GetLastError()));
  61                 return false;
  62         }
  63
  64         if(!strchr(program_name, '\\')) {
  65                 GetCurrentDirectory(sizeof command - 1, command + 1);
  66                 strncat(command, "\\", sizeof command - strlen(command));
  67         }
  68
  69         strncat(command, program_name, sizeof command - strlen(command));
  70
  71         strncat(command, "\"", sizeof command - strlen(command));
  72
  73         for(char **argp = g_argv + 1; *argp; argp++) {
  74                 char *space = strchr(*argp, ' ');
  75                 strncat(command, " ", sizeof command - strlen(command));
  76
  77                 if(space)
  78                         strncat(command, "\"", sizeof command - strlen(command));
  79
  80                 strncat(command, *argp, sizeof command - strlen(command));
  81
  82                 if(space)
  83                         strncat(command, "\"", sizeof command - strlen(command));
  84         }
  85
  86         service = CreateService(manager, identname, identname,
  87                         SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, SERVICE_ERROR_NORMAL,
  88                         command, NULL, NULL, NULL, NULL, NULL);
  89
  90         if(!service) {
  91                 DWORD lasterror = GetLastError();
  92                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not create %s service: %s", identname, winerror(lasterror));
  93                 if(lasterror != ERROR_SERVICE_EXISTS)
  94                         return false;
  95         }
  96
  97         if(service) {
  98                 ChangeServiceConfig2(service, SERVICE_CONFIG_DESCRIPTION, &description);
  99                 logger(DEBUG_ALWAYS, LOG_INFO, "%s service installed", identname);
 100         } else {
 101                 service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
 102         }
 103
 104         if(!StartService(service, 0, NULL))
 105                 logger(DEBUG_ALWAYS, LOG_WARNING, "Could not start %s service: %s", identname, winerror(GetLastError()));
 106         else
 107                 logger(DEBUG_ALWAYS, LOG_INFO, "%s service started", identname);
 108
 109         return true;
 110 }
 111
 112 DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID boe, LPVOID bah) {
 113         switch(request) {
 114                 case SERVICE_CONTROL_INTERROGATE:
 115                         SetServiceStatus(statushandle, &status);
 116                         return NO_ERROR;
 117                 case SERVICE_CONTROL_STOP:
 118                         logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_STOP");
 119                         break;
 120                 case SERVICE_CONTROL_SHUTDOWN:
 121                         logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_SHUTDOWN");
 122                         break;
 123                 default:
 124                         logger(DEBUG_ALWAYS, LOG_WARNING, "Got unexpected request %d", (int)request);
 125                         return ERROR_CALL_NOT_IMPLEMENTED;
 126         }
 127
 128         event_exit();
 129         status.dwWaitHint = 30000;
 130         status.dwCurrentState = SERVICE_STOP_PENDING;
 131         SetServiceStatus(statushandle, &status);
 132         return NO_ERROR;
 133 }
 134
 135 VOID WINAPI run_service(DWORD argc, LPTSTR* argv) {
 136         extern int main2(int argc, char **argv);
 137
 138         status.dwServiceType = SERVICE_WIN32;
 139         status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
 140         status.dwWin32ExitCode = 0;
 141         status.dwServiceSpecificExitCode = 0;
 142         status.dwCheckPoint = 0;
 143
 144         statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
 145
 146         if (!statushandle) {
 147                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
 148         } else {
 149                 status.dwWaitHint = 30000;
 150                 status.dwCurrentState = SERVICE_START_PENDING;
 151                 SetServiceStatus(statushandle, &status);
 152
 153                 status.dwWaitHint = 0;
 154                 status.dwCurrentState = SERVICE_RUNNING;
 155                 SetServiceStatus(statushandle, &status);
 156
 157                 main2(argc, argv);
 158
 159                 status.dwWaitHint = 0;
 160                 status.dwCurrentState = SERVICE_STOPPED;
 161                 SetServiceStatus(statushandle, &status);
 162         }
 163
 164         return;
 165 }
 166
 167 bool init_service(void) {
 168         SERVICE_TABLE_ENTRY services[] = {
 169                 {identname, run_service},
 170                 {NULL, NULL}
 171         };
 172
 173         if(!StartServiceCtrlDispatcher(services)) {
 174                 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
 175                         return false;
 176                 }
 177                 else
 178                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "StartServiceCtrlDispatcher", winerror(GetLastError()));
 179         }
 180
 181         return true;
 182 }
 183 #endif
 184
 185 /*
 186   Detach from current terminal
 187 */
 188 bool detach(void) {
 189         logmode_t logmode;
 190
 191 #ifndef HAVE_MINGW
 192         signal(SIGPIPE, SIG_IGN);
 193         signal(SIGUSR1, SIG_IGN);
 194         signal(SIGUSR2, SIG_IGN);
 195         signal(SIGWINCH, SIG_IGN);
 196
 197         closelogger();
 198 #endif
 199
 200         if(do_detach) {
 201 #ifndef HAVE_MINGW
 202                 if(daemon(0, 0)) {
 203                         logger(DEBUG_ALWAYS, LOG_ERR, "Couldn't detach from terminal: %s", strerror(errno));
 204                         return false;
 205                 }
 206 #else
 207                 if(!statushandle)
 208                         exit(!install_service());
 209 #endif
 210         }
 211
 212         logmode = use_logfile?LOGMODE_FILE:LOGMODE_SYSLOG;
 213         if(do_detach && !use_syslog)
 214                 logmode = LOGMODE_STDERR;
 215         openlogger(identname, logmode);
 216
 217         logger(DEBUG_ALWAYS, LOG_NOTICE, "tincd %s (%s %s) starting, debug level %d",
 218                            VERSION, __DATE__, __TIME__, debug_level);
 219
 220         return true;
 221 }