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