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 #include "version.h"
  38
  39 /* If zero, don't detach from the terminal. */
  40 bool do_detach = true;
  41 bool sigalrm = false;
  42
  43 extern char **g_argv;
  44 extern bool use_logfile;
  45 extern bool use_syslog;
  46
  47 /* Some functions the less gifted operating systems might lack... */
  48
  49 #ifdef HAVE_MINGW
  50 static SC_HANDLE manager = NULL;
  51 static SC_HANDLE service = NULL;
  52 static SERVICE_STATUS status = {0};
  53 static SERVICE_STATUS_HANDLE statushandle = 0;
  54
  55 static bool install_service(void) {
  56         char command[4096] = "\"";
  57         SERVICE_DESCRIPTION description = {"Virtual Private Network daemon"};
  58
  59         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
  60         if(!manager) {
  61                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open service manager: %s", winerror(GetLastError()));
  62                 return false;
  63         }
  64
  65         HMODULE module = GetModuleHandle(NULL);
  66         GetModuleFileName(module, command + 1, sizeof command - 1);
  67         command[sizeof command - 1] = 0;
  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 io_t stop_io;
 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         status.dwWaitHint = 1000;
 129         status.dwCurrentState = SERVICE_STOP_PENDING;
 130         SetServiceStatus(statushandle, &status);
 131         if (WSASetEvent(stop_io.event) == FALSE)
 132                 abort();
 133         return NO_ERROR;
 134 }
 135
 136 VOID WINAPI run_service(DWORD argc, LPTSTR* argv) {
 137         extern int main2(int argc, char **argv);
 138
 139         status.dwServiceType = SERVICE_WIN32;
 140         status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
 141         status.dwWin32ExitCode = 0;
 142         status.dwServiceSpecificExitCode = 0;
 143         status.dwCheckPoint = 0;
 144
 145         statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
 146
 147         if (!statushandle) {
 148                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
 149         } else {
 150                 status.dwWaitHint = 30000;
 151                 status.dwCurrentState = SERVICE_START_PENDING;
 152                 SetServiceStatus(statushandle, &status);
 153
 154                 status.dwWaitHint = 0;
 155                 status.dwCurrentState = SERVICE_RUNNING;
 156                 SetServiceStatus(statushandle, &status);
 157
 158                 main2(argc, argv);
 159
 160                 status.dwWaitHint = 0;
 161                 status.dwCurrentState = SERVICE_STOPPED;
 162                 SetServiceStatus(statushandle, &status);
 163         }
 164
 165         return;
 166 }
 167
 168 bool init_service(void) {
 169         SERVICE_TABLE_ENTRY services[] = {
 170                 {identname, run_service},
 171                 {NULL, NULL}
 172         };
 173
 174         if(!StartServiceCtrlDispatcher(services)) {
 175                 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
 176                         return false;
 177                 }
 178                 else
 179                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "StartServiceCtrlDispatcher", winerror(GetLastError()));
 180         }
 181
 182         return true;
 183 }
 184 #endif
 185
 186 /*
 187   Detach from current terminal
 188 */
 189 bool detach(void) {
 190         logmode_t logmode;
 191
 192 #ifndef HAVE_MINGW
 193         signal(SIGPIPE, SIG_IGN);
 194         signal(SIGUSR1, SIG_IGN);
 195         signal(SIGUSR2, SIG_IGN);
 196         signal(SIGWINCH, SIG_IGN);
 197
 198         closelogger();
 199 #endif
 200
 201         if(do_detach) {
 202 #ifndef HAVE_MINGW
 203                 if(daemon(1, 0)) {
 204                         logger(DEBUG_ALWAYS, LOG_ERR, "Couldn't detach from terminal: %s", strerror(errno));
 205                         return false;
 206                 }
 207 #else
 208                 if(!statushandle)
 209                         exit(!install_service());
 210 #endif
 211         }
 212
 213         if(use_logfile)
 214                 logmode = LOGMODE_FILE;
 215         else if(use_syslog || do_detach)
 216                 logmode = LOGMODE_SYSLOG;
 217         else
 218                 logmode = LOGMODE_STDERR;
 219
 220         openlogger(identname, logmode);
 221
 222         logger(DEBUG_ALWAYS, LOG_NOTICE, "tincd %s (%s %s) starting, debug level %d",
 223                            BUILD_VERSION, BUILD_DATE, BUILD_TIME, debug_level);
 224
 225         return true;
 226 }