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
  45 /* Some functions the less gifted operating systems might lack... */
  46
  47 #ifdef HAVE_MINGW
  48 static SC_HANDLE manager = NULL;
  49 static SC_HANDLE service = NULL;
  50 static SERVICE_STATUS status = {0};
  51 static SERVICE_STATUS_HANDLE statushandle = 0;
  52
  53 static bool install_service(void) {
  54         char command[4096] = "\"";
  55         SERVICE_DESCRIPTION description = {"Virtual Private Network daemon"};
  56
  57         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
  58         if(!manager) {
  59                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open service manager: %s", winerror(GetLastError()));
  60                 return false;
  61         }
  62
  63         if(!strchr(program_name, '\\')) {
  64                 GetCurrentDirectory(sizeof command - 1, command + 1);
  65                 strncat(command, "\\", sizeof command - strlen(command));
  66         }
  67
  68         strncat(command, program_name, sizeof command - strlen(command));
  69
  70         strncat(command, "\"", sizeof command - strlen(command));
  71
  72         for(char **argp = g_argv + 1; *argp; argp++) {
  73                 char *space = strchr(*argp, ' ');
  74                 strncat(command, " ", sizeof command - strlen(command));
  75
  76                 if(space)
  77                         strncat(command, "\"", sizeof command - strlen(command));
  78
  79                 strncat(command, *argp, sizeof command - strlen(command));
  80
  81                 if(space)
  82                         strncat(command, "\"", sizeof command - strlen(command));
  83         }
  84
  85         service = CreateService(manager, identname, identname,
  86                         SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, SERVICE_ERROR_NORMAL,
  87                         command, NULL, NULL, NULL, NULL, NULL);
  88
  89         if(!service) {
  90                 DWORD lasterror = GetLastError();
  91                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not create %s service: %s", identname, winerror(lasterror));
  92                 if(lasterror != ERROR_SERVICE_EXISTS)
  93                         return false;
  94         }
  95
  96         if(service) {
  97                 ChangeServiceConfig2(service, SERVICE_CONFIG_DESCRIPTION, &description);
  98                 logger(DEBUG_ALWAYS, LOG_INFO, "%s service installed", identname);
  99         } else {
 100                 service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
 101         }
 102
 103         if(!StartService(service, 0, NULL))
 104                 logger(DEBUG_ALWAYS, LOG_WARNING, "Could not start %s service: %s", identname, winerror(GetLastError()));
 105         else
 106                 logger(DEBUG_ALWAYS, LOG_INFO, "%s service started", identname);
 107
 108         return true;
 109 }
 110
 111 static io_t stop_io;
 112
 113 DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID boe, LPVOID bah) {
 114         switch(request) {
 115                 case SERVICE_CONTROL_INTERROGATE:
 116                         SetServiceStatus(statushandle, &status);
 117                         return NO_ERROR;
 118                 case SERVICE_CONTROL_STOP:
 119                         logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_STOP");
 120                         break;
 121                 case SERVICE_CONTROL_SHUTDOWN:
 122                         logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_SHUTDOWN");
 123                         break;
 124                 default:
 125                         logger(DEBUG_ALWAYS, LOG_WARNING, "Got unexpected request %d", (int)request);
 126                         return ERROR_CALL_NOT_IMPLEMENTED;
 127         }
 128
 129         status.dwWaitHint = 1000;
 130         status.dwCurrentState = SERVICE_STOP_PENDING;
 131         SetServiceStatus(statushandle, &status);
 132         if (WSASetEvent(stop_io.event) == FALSE)
 133                 abort();
 134         return NO_ERROR;
 135 }
 136
 137 static void stop_handler(void *data, int flags) {
 138         event_exit();
 139 }
 140
 141 VOID WINAPI run_service(DWORD argc, LPTSTR* argv) {
 142         extern int main2(int argc, char **argv);
 143
 144         io_add_event(&stop_io, stop_handler, NULL, WSACreateEvent());
 145         if (stop_io.event == FALSE)
 146                 abort();
 147
 148         status.dwServiceType = SERVICE_WIN32;
 149         status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
 150         status.dwWin32ExitCode = 0;
 151         status.dwServiceSpecificExitCode = 0;
 152         status.dwCheckPoint = 0;
 153
 154         statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
 155
 156         if (!statushandle) {
 157                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
 158         } else {
 159                 status.dwWaitHint = 30000;
 160                 status.dwCurrentState = SERVICE_START_PENDING;
 161                 SetServiceStatus(statushandle, &status);
 162
 163                 status.dwWaitHint = 0;
 164                 status.dwCurrentState = SERVICE_RUNNING;
 165                 SetServiceStatus(statushandle, &status);
 166
 167                 main2(argc, argv);
 168
 169                 status.dwWaitHint = 0;
 170                 status.dwCurrentState = SERVICE_STOPPED;
 171                 SetServiceStatus(statushandle, &status);
 172         }
 173
 174         if (WSACloseEvent(stop_io.event) == FALSE)
 175                 abort();
 176         io_del(&stop_io);
 177         return;
 178 }
 179
 180 bool init_service(void) {
 181         SERVICE_TABLE_ENTRY services[] = {
 182                 {identname, run_service},
 183                 {NULL, NULL}
 184         };
 185
 186         if(!StartServiceCtrlDispatcher(services)) {
 187                 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
 188                         return false;
 189                 }
 190                 else
 191                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "StartServiceCtrlDispatcher", winerror(GetLastError()));
 192         }
 193
 194         return true;
 195 }
 196 #endif
 197
 198 /*
 199   Detach from current terminal
 200 */
 201 bool detach(void) {
 202 #ifndef HAVE_MINGW
 203         signal(SIGPIPE, SIG_IGN);
 204         signal(SIGUSR1, SIG_IGN);
 205         signal(SIGUSR2, SIG_IGN);
 206         signal(SIGWINCH, SIG_IGN);
 207
 208         closelogger();
 209 #endif
 210
 211         if(do_detach) {
 212 #ifndef HAVE_MINGW
 213                 if(daemon(0, 0)) {
 214                         logger(DEBUG_ALWAYS, LOG_ERR, "Couldn't detach from terminal: %s", strerror(errno));
 215                         return false;
 216                 }
 217 #else
 218                 if(!statushandle)
 219                         exit(!install_service());
 220 #endif
 221         }
 222
 223         openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
 224
 225         logger(DEBUG_ALWAYS, LOG_NOTICE, "tincd %s (%s %s) starting, debug level %d",
 226                            VERSION, __DATE__, __TIME__, debug_level);
 227
 228         return true;
 229 }
 230
 231