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         SERVICE_DESCRIPTION description = {"Virtual Private Network daemon"};
  50
  51         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
  52
  53         if(!manager) {
  54                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open service manager: %s", winerror(GetLastError()));
  55                 return false;
  56         }
  57
  58         HMODULE module = GetModuleHandle(NULL);
  59         GetModuleFileName(module, command + 1, sizeof(command) - 1);
  60         command[sizeof(command) - 1] = 0;
  61
  62         strncat(command, "\"", sizeof(command) - strlen(command));
  63
  64         for(char **argp = g_argv + 1; *argp; argp++) {
  65                 char *space = strchr(*argp, ' ');
  66                 strncat(command, " ", sizeof(command) - strlen(command));
  67
  68                 if(space) {
  69                         strncat(command, "\"", sizeof(command) - strlen(command));
  70                 }
  71
  72                 strncat(command, *argp, sizeof(command) - strlen(command));
  73
  74                 if(space) {
  75                         strncat(command, "\"", sizeof(command) - strlen(command));
  76                 }
  77         }
  78
  79         service = CreateService(manager, identname, identname,
  80                                 SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, SERVICE_ERROR_NORMAL,
  81                                 command, NULL, NULL, NULL, NULL, NULL);
  82
  83         if(!service) {
  84                 DWORD lasterror = GetLastError();
  85                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not create %s service: %s", identname, winerror(lasterror));
  86
  87                 if(lasterror != ERROR_SERVICE_EXISTS) {
  88                         return false;
  89                 }
  90         }
  91
  92         if(service) {
  93                 ChangeServiceConfig2(service, SERVICE_CONFIG_DESCRIPTION, &description);
  94                 logger(DEBUG_ALWAYS, LOG_INFO, "%s service installed", identname);
  95         } else {
  96                 service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
  97         }
  98
  99         if(!StartService(service, 0, NULL)) {
 100                 logger(DEBUG_ALWAYS, LOG_WARNING, "Could not start %s service: %s", identname, winerror(GetLastError()));
 101         } else {
 102                 logger(DEBUG_ALWAYS, LOG_INFO, "%s service started", identname);
 103         }
 104
 105         return true;
 106 }
 107
 108 io_t stop_io;
 109
 110 DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID data, LPVOID context) {
 111         (void)type;
 112         (void)data;
 113         (void)context;
 114
 115         switch(request) {
 116         case SERVICE_CONTROL_INTERROGATE:
 117                 SetServiceStatus(statushandle, &status);
 118                 return NO_ERROR;
 119
 120         case SERVICE_CONTROL_STOP:
 121                 logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_STOP");
 122                 break;
 123
 124         case SERVICE_CONTROL_SHUTDOWN:
 125                 logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_SHUTDOWN");
 126                 break;
 127
 128         default:
 129                 logger(DEBUG_ALWAYS, LOG_WARNING, "Got unexpected request %d", (int)request);
 130                 return ERROR_CALL_NOT_IMPLEMENTED;
 131         }
 132
 133         status.dwWaitHint = 1000;
 134         status.dwCurrentState = SERVICE_STOP_PENDING;
 135         SetServiceStatus(statushandle, &status);
 136
 137         if(WSASetEvent(stop_io.event) == FALSE) {
 138                 abort();
 139         }
 140
 141         return NO_ERROR;
 142 }
 143
 144 VOID WINAPI run_service(DWORD argc, LPTSTR *argv) {
 145         extern int main2(int argc, char **argv);
 146
 147         status.dwServiceType = SERVICE_WIN32;
 148         status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
 149         status.dwWin32ExitCode = 0;
 150         status.dwServiceSpecificExitCode = 0;
 151         status.dwCheckPoint = 0;
 152
 153         statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
 154
 155         if(!statushandle) {
 156                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
 157         } else {
 158                 status.dwWaitHint = 30000;
 159                 status.dwCurrentState = SERVICE_START_PENDING;
 160                 SetServiceStatus(statushandle, &status);
 161
 162                 status.dwWaitHint = 0;
 163                 status.dwCurrentState = SERVICE_RUNNING;
 164                 SetServiceStatus(statushandle, &status);
 165
 166                 main2(argc, argv);
 167
 168                 status.dwWaitHint = 0;
 169                 status.dwCurrentState = SERVICE_STOPPED;
 170                 SetServiceStatus(statushandle, &status);
 171         }
 172
 173         return;
 174 }
 175
 176 bool init_service(void) {
 177         SERVICE_TABLE_ENTRY services[] = {
 178                 {identname, run_service},
 179                 {NULL, NULL}
 180         };
 181
 182         if(!StartServiceCtrlDispatcher(services)) {
 183                 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
 184                         return false;
 185                 } else {
 186                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "StartServiceCtrlDispatcher", winerror(GetLastError()));
 187                 }
 188         }
 189
 190         return true;
 191 }
 192 #endif
 193
 194 /*
 195   Detach from current terminal
 196 */
 197 bool detach(void) {
 198         logmode_t logmode;
 199
 200 #ifndef HAVE_MINGW
 201         signal(SIGPIPE, SIG_IGN);
 202         signal(SIGUSR1, SIG_IGN);
 203         signal(SIGUSR2, SIG_IGN);
 204         signal(SIGWINCH, SIG_IGN);
 205
 206         closelogger();
 207 #endif
 208
 209         if(do_detach) {
 210 #ifndef HAVE_MINGW
 211
 212                 if(daemon(1, 0)) {
 213                         logger(DEBUG_ALWAYS, LOG_ERR, "Couldn't detach from terminal: %s", strerror(errno));
 214                         return false;
 215                 }
 216
 217 #else
 218
 219                 if(!statushandle) {
 220                         exit(!install_service());
 221                 }
 222
 223 #endif
 224         }
 225
 226         if(use_logfile) {
 227                 logmode = LOGMODE_FILE;
 228         } else if(use_syslog || do_detach) {
 229                 logmode = LOGMODE_SYSLOG;
 230         } else {
 231                 logmode = LOGMODE_STDERR;
 232         }
 233
 234         openlogger(identname, logmode);
 235
 236         logger(DEBUG_ALWAYS, LOG_NOTICE, "tincd %s (%s %s) starting, debug level %d",
 237                BUILD_VERSION, BUILD_DATE, BUILD_TIME, debug_level);
 238
 239         return true;
 240 }