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 "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
  61         if(!manager) {
  62                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open service manager: %s", winerror(GetLastError()));
  63                 return false;
  64         }
  65
  66         HMODULE module = GetModuleHandle(NULL);
  67         GetModuleFileName(module, command + 1, sizeof(command) - 1);
  68         command[sizeof(command) - 1] = 0;
  69
  70         strncat(command, "\"", sizeof(command) - strlen(command));
  71
  72         for(char **argp = g_argv + 1; *argp; argp++) {
  73                 char *space = strchr(*argp, ' ');
  74                 strncat(command, " ", sizeof(command) - strlen(command));
  75
  76                 if(space) {
  77                         strncat(command, "\"", sizeof(command) - strlen(command));
  78                 }
  79
  80                 strncat(command, *argp, sizeof(command) - strlen(command));
  81
  82                 if(space) {
  83                         strncat(command, "\"", sizeof(command) - strlen(command));
  84                 }
  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
  95                 if(lasterror != ERROR_SERVICE_EXISTS) {
  96                         return false;
  97                 }
  98         }
  99
 100         if(service) {
 101                 ChangeServiceConfig2(service, SERVICE_CONFIG_DESCRIPTION, &description);
 102                 logger(DEBUG_ALWAYS, LOG_INFO, "%s service installed", identname);
 103         } else {
 104                 service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
 105         }
 106
 107         if(!StartService(service, 0, NULL)) {
 108                 logger(DEBUG_ALWAYS, LOG_WARNING, "Could not start %s service: %s", identname, winerror(GetLastError()));
 109         } else {
 110                 logger(DEBUG_ALWAYS, LOG_INFO, "%s service started", identname);
 111         }
 112
 113         return true;
 114 }
 115
 116 io_t stop_io;
 117
 118 DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID data, LPVOID context) {
 119         (void)type;
 120         (void)data;
 121         (void)context;
 122
 123         switch(request) {
 124         case SERVICE_CONTROL_INTERROGATE:
 125                 SetServiceStatus(statushandle, &status);
 126                 return NO_ERROR;
 127
 128         case SERVICE_CONTROL_STOP:
 129                 logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_STOP");
 130                 break;
 131
 132         case SERVICE_CONTROL_SHUTDOWN:
 133                 logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_SHUTDOWN");
 134                 break;
 135
 136         default:
 137                 logger(DEBUG_ALWAYS, LOG_WARNING, "Got unexpected request %d", (int)request);
 138                 return ERROR_CALL_NOT_IMPLEMENTED;
 139         }
 140
 141         status.dwWaitHint = 1000;
 142         status.dwCurrentState = SERVICE_STOP_PENDING;
 143         SetServiceStatus(statushandle, &status);
 144
 145         if(WSASetEvent(stop_io.event) == FALSE) {
 146                 abort();
 147         }
 148
 149         return NO_ERROR;
 150 }
 151
 152 VOID WINAPI run_service(DWORD argc, LPTSTR *argv) {
 153         extern int main2(int argc, char **argv);
 154
 155         status.dwServiceType = SERVICE_WIN32;
 156         status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
 157         status.dwWin32ExitCode = 0;
 158         status.dwServiceSpecificExitCode = 0;
 159         status.dwCheckPoint = 0;
 160
 161         statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
 162
 163         if(!statushandle) {
 164                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
 165         } else {
 166                 status.dwWaitHint = 30000;
 167                 status.dwCurrentState = SERVICE_START_PENDING;
 168                 SetServiceStatus(statushandle, &status);
 169
 170                 status.dwWaitHint = 0;
 171                 status.dwCurrentState = SERVICE_RUNNING;
 172                 SetServiceStatus(statushandle, &status);
 173
 174                 main2(argc, argv);
 175
 176                 status.dwWaitHint = 0;
 177                 status.dwCurrentState = SERVICE_STOPPED;
 178                 SetServiceStatus(statushandle, &status);
 179         }
 180
 181         return;
 182 }
 183
 184 bool init_service(void) {
 185         SERVICE_TABLE_ENTRY services[] = {
 186                 {identname, run_service},
 187                 {NULL, NULL}
 188         };
 189
 190         if(!StartServiceCtrlDispatcher(services)) {
 191                 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
 192                         return false;
 193                 } else {
 194                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "StartServiceCtrlDispatcher", winerror(GetLastError()));
 195                 }
 196         }
 197
 198         return true;
 199 }
 200 #endif
 201
 202 /*
 203   Detach from current terminal
 204 */
 205 bool detach(void) {
 206         logmode_t logmode;
 207
 208 #ifndef HAVE_MINGW
 209         signal(SIGPIPE, SIG_IGN);
 210         signal(SIGUSR1, SIG_IGN);
 211         signal(SIGUSR2, SIG_IGN);
 212         signal(SIGWINCH, SIG_IGN);
 213
 214         closelogger();
 215 #endif
 216
 217         if(do_detach) {
 218 #ifndef HAVE_MINGW
 219
 220                 if(daemon(1, 0)) {
 221                         logger(DEBUG_ALWAYS, LOG_ERR, "Couldn't detach from terminal: %s", strerror(errno));
 222                         return false;
 223                 }
 224
 225 #else
 226
 227                 if(!statushandle) {
 228                         exit(!install_service());
 229                 }
 230
 231 #endif
 232         }
 233
 234         if(use_logfile) {
 235                 logmode = LOGMODE_FILE;
 236         } else if(use_syslog || do_detach) {
 237                 logmode = LOGMODE_SYSLOG;
 238         } else {
 239                 logmode = LOGMODE_STDERR;
 240         }
 241
 242         openlogger(identname, logmode);
 243
 244         logger(DEBUG_ALWAYS, LOG_NOTICE, "tincd %s (%s %s) starting, debug level %d",
 245                BUILD_VERSION, BUILD_DATE, BUILD_TIME, debug_level);
 246
 247         return true;
 248 }