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

   1 /*
   2     process.c -- process management functions
   3     Copyright (C) 1999-2005 Ivo Timmermans,
   4                   2000-2018 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 "logger.h"
  24 #include "names.h"
  25 #include "process.h"
  26 #include "version.h"
  27
  28 #ifdef HAVE_MINGW
  29 #include "utils.h"
  30 #endif
  31
  32 /* If zero, don't detach from the terminal. */
  33 bool do_detach = true;
  34
  35 extern char **g_argv;
  36 extern bool use_logfile;
  37 extern bool use_syslog;
  38
  39 /* Some functions the less gifted operating systems might lack... */
  40
  41 #ifdef HAVE_MINGW
  42 static SC_HANDLE manager = NULL;
  43 static SC_HANDLE service = NULL;
  44 static SERVICE_STATUS status = {0};
  45 static SERVICE_STATUS_HANDLE statushandle = 0;
  46
  47 static bool install_service(void) {
  48         char command[4096] = "\"";
  49         char description_buffer[] = "Virtual Private Network daemon";
  50         SERVICE_DESCRIPTION description = {description_buffer};
  51
  52         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
  53
  54         if(!manager) {
  55                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open service manager: %s", winerror(GetLastError()));
  56                 return false;
  57         }
  58
  59         HMODULE module = GetModuleHandle(NULL);
  60         GetModuleFileName(module, command + 1, sizeof(command) - 1);
  61         command[sizeof(command) - 1] = 0;
  62
  63         strncat(command, "\"", sizeof(command) - strlen(command));
  64
  65         for(char **argp = g_argv + 1; *argp; argp++) {
  66                 char *space = strchr(*argp, ' ');
  67                 strncat(command, " ", sizeof(command) - strlen(command));
  68
  69                 if(space) {
  70                         strncat(command, "\"", sizeof(command) - strlen(command));
  71                 }
  72
  73                 strncat(command, *argp, sizeof(command) - strlen(command));
  74
  75                 if(space) {
  76                         strncat(command, "\"", sizeof(command) - strlen(command));
  77                 }
  78         }
  79
  80         service = CreateService(manager, identname, identname,
  81                                 SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, SERVICE_ERROR_NORMAL,
  82                                 command, NULL, NULL, NULL, NULL, NULL);
  83
  84         if(!service) {
  85                 DWORD lasterror = GetLastError();
  86                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not create %s service: %s", identname, winerror(lasterror));
  87
  88                 if(lasterror != ERROR_SERVICE_EXISTS) {
  89                         return false;
  90                 }
  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
 106         return true;
 107 }
 108
 109 io_t stop_io;
 110
 111 static DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID data, LPVOID context) {
 112         (void)type;
 113         (void)data;
 114         (void)context;
 115
 116         switch(request) {
 117         case SERVICE_CONTROL_INTERROGATE:
 118                 SetServiceStatus(statushandle, &status);
 119                 return NO_ERROR;
 120
 121         case SERVICE_CONTROL_STOP:
 122                 logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_STOP");
 123                 break;
 124
 125         case SERVICE_CONTROL_SHUTDOWN:
 126                 logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_SHUTDOWN");
 127                 break;
 128
 129         default:
 130                 logger(DEBUG_ALWAYS, LOG_WARNING, "Got unexpected request %d", (int)request);
 131                 return ERROR_CALL_NOT_IMPLEMENTED;
 132         }
 133
 134         status.dwWaitHint = 1000;
 135         status.dwCurrentState = SERVICE_STOP_PENDING;
 136         SetServiceStatus(statushandle, &status);
 137
 138         if(WSASetEvent(stop_io.event) == FALSE) {
 139                 abort();
 140         }
 141
 142         return NO_ERROR;
 143 }
 144
 145 static VOID WINAPI run_service(DWORD argc, LPTSTR *argv) {
 146         extern int main2(int argc, char **argv);
 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         return;
 175 }
 176
 177 bool init_service(void) {
 178         SERVICE_TABLE_ENTRY services[] = {
 179                 {identname, run_service},
 180                 {NULL, NULL}
 181         };
 182
 183         if(!StartServiceCtrlDispatcher(services)) {
 184                 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
 185                         return false;
 186                 } else {
 187                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "StartServiceCtrlDispatcher", winerror(GetLastError()));
 188                 }
 189         }
 190
 191         return true;
 192 }
 193 #endif
 194
 195 /*
 196   Detach from current terminal
 197 */
 198 bool detach(void) {
 199         logmode_t logmode;
 200
 201 #ifndef HAVE_MINGW
 202         signal(SIGPIPE, SIG_IGN);
 203         signal(SIGUSR1, SIG_IGN);
 204         signal(SIGUSR2, SIG_IGN);
 205         signal(SIGWINCH, SIG_IGN);
 206
 207         closelogger();
 208 #endif
 209
 210         if(do_detach) {
 211 #ifndef HAVE_MINGW
 212
 213                 if(daemon(1, 0)) {
 214                         logger(DEBUG_ALWAYS, LOG_ERR, "Couldn't detach from terminal: %s", strerror(errno));
 215                         return false;
 216                 }
 217
 218 #else
 219
 220                 if(!statushandle) {
 221                         exit(!install_service());
 222                 }
 223
 224 #endif
 225         }
 226
 227         if(use_logfile) {
 228                 logmode = LOGMODE_FILE;
 229         } else if(use_syslog || do_detach) {
 230                 logmode = LOGMODE_SYSLOG;
 231         } else {
 232                 logmode = LOGMODE_STDERR;
 233         }
 234
 235         openlogger(identname, logmode);
 236
 237         logger(DEBUG_ALWAYS, LOG_NOTICE, "tincd %s (%s %s) starting, debug level %d",
 238                BUILD_VERSION, BUILD_DATE, BUILD_TIME, debug_level);
 239
 240         return true;
 241 }