tinc-vpn.org Git - tinc/blob - 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_WINDOWS
  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
  37 /* If nonzero, use syslog instead of stderr in no-detach mode. */
  38 bool use_syslog = false;
  39
  40 /* If nonzero, write log entries to a separate file. */
  41 bool use_logfile = false;
  42
  43 /* Some functions the less gifted operating systems might lack... */
  44
  45 #ifdef HAVE_WINDOWS
  46 static SC_HANDLE manager = NULL;
  47 static SC_HANDLE service = NULL;
  48 static SERVICE_STATUS status = {0};
  49 static SERVICE_STATUS_HANDLE statushandle = 0;
  50
  51 static bool install_service(void) {
  52         char command[4096] = "\"";
  53         char description_buffer[] = "Virtual Private Network daemon";
  54         SERVICE_DESCRIPTION description = {description_buffer};
  55
  56         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
  57
  58         if(!manager) {
  59                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open service manager: %s", winerror(GetLastError()));
  60                 return false;
  61         }
  62
  63         HMODULE module = GetModuleHandle(NULL);
  64         GetModuleFileName(module, command + 1, sizeof(command) - 1);
  65         command[sizeof(command) - 1] = 0;
  66
  67         strncat(command, "\"", sizeof(command) - strlen(command));
  68
  69         for(char **argp = g_argv + 1; *argp; argp++) {
  70                 char *space = strchr(*argp, ' ');
  71                 strncat(command, " ", sizeof(command) - strlen(command));
  72
  73                 if(space) {
  74                         strncat(command, "\"", sizeof(command) - strlen(command));
  75                 }
  76
  77                 strncat(command, *argp, sizeof(command) - strlen(command));
  78
  79                 if(space) {
  80                         strncat(command, "\"", sizeof(command) - strlen(command));
  81                 }
  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
  92                 if(lasterror != ERROR_SERVICE_EXISTS) {
  93                         return false;
  94                 }
  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
 110         return true;
 111 }
 112
 113 io_t stop_io;
 114
 115 static DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID data, LPVOID context) {
 116         (void)type;
 117         (void)data;
 118         (void)context;
 119
 120         switch(request) {
 121         case SERVICE_CONTROL_INTERROGATE:
 122                 SetServiceStatus(statushandle, &status);
 123                 return NO_ERROR;
 124
 125         case SERVICE_CONTROL_STOP:
 126                 logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_STOP");
 127                 break;
 128
 129         case SERVICE_CONTROL_SHUTDOWN:
 130                 logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_SHUTDOWN");
 131                 break;
 132
 133         default:
 134                 logger(DEBUG_ALWAYS, LOG_WARNING, "Got unexpected request %d", (int)request);
 135                 return ERROR_CALL_NOT_IMPLEMENTED;
 136         }
 137
 138         status.dwWaitHint = 1000;
 139         status.dwCurrentState = SERVICE_STOP_PENDING;
 140         SetServiceStatus(statushandle, &status);
 141
 142         if(WSASetEvent(stop_io.event) == FALSE) {
 143                 abort();
 144         }
 145
 146         return NO_ERROR;
 147 }
 148
 149 static VOID WINAPI run_service(DWORD argc, LPTSTR *argv) {
 150         extern int main2(int argc, char **argv);
 151
 152         status.dwServiceType = SERVICE_WIN32;
 153         status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
 154         status.dwWin32ExitCode = 0;
 155         status.dwServiceSpecificExitCode = 0;
 156         status.dwCheckPoint = 0;
 157
 158         statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
 159
 160         if(!statushandle) {
 161                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
 162         } else {
 163                 status.dwWaitHint = 30000;
 164                 status.dwCurrentState = SERVICE_START_PENDING;
 165                 SetServiceStatus(statushandle, &status);
 166
 167                 status.dwWaitHint = 0;
 168                 status.dwCurrentState = SERVICE_RUNNING;
 169                 SetServiceStatus(statushandle, &status);
 170
 171                 main2(argc, argv);
 172
 173                 status.dwWaitHint = 0;
 174                 status.dwCurrentState = SERVICE_STOPPED;
 175                 SetServiceStatus(statushandle, &status);
 176         }
 177
 178         return;
 179 }
 180
 181 bool init_service(void) {
 182         SERVICE_TABLE_ENTRY services[] = {
 183                 {identname, run_service},
 184                 {NULL, NULL}
 185         };
 186
 187         if(!StartServiceCtrlDispatcher(services)) {
 188                 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
 189                         return false;
 190                 } else {
 191                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "StartServiceCtrlDispatcher", winerror(GetLastError()));
 192                 }
 193         }
 194
 195         return true;
 196 }
 197 #endif
 198
 199 /*
 200   Detach from current terminal
 201 */
 202 bool detach(void) {
 203         logmode_t logmode;
 204
 205 #ifndef HAVE_WINDOWS
 206         signal(SIGPIPE, SIG_IGN);
 207         signal(SIGUSR1, SIG_IGN);
 208         signal(SIGUSR2, SIG_IGN);
 209         signal(SIGWINCH, SIG_IGN);
 210
 211         closelogger();
 212 #endif
 213
 214         if(do_detach) {
 215 #ifndef HAVE_WINDOWS
 216
 217                 if(daemon(1, 0)) {
 218                         logger(DEBUG_ALWAYS, LOG_ERR, "Couldn't detach from terminal: %s", strerror(errno));
 219                         return false;
 220                 }
 221
 222 #else
 223
 224                 if(!statushandle) {
 225                         exit(!install_service());
 226                 }
 227
 228 #endif
 229         }
 230
 231         if(use_logfile) {
 232                 logmode = LOGMODE_FILE;
 233         } else if(use_syslog || do_detach) {
 234                 logmode = LOGMODE_SYSLOG;
 235         } else {
 236                 logmode = LOGMODE_STDERR;
 237         }
 238
 239         openlogger(identname, logmode);
 240
 241         logger(DEBUG_ALWAYS, LOG_NOTICE, "tincd %s (%s %s) starting, debug level %d",
 242                BUILD_VERSION, BUILD_DATE, BUILD_TIME, debug_level);
 243
 244         return true;
 245 }