www.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
  38 /* If zero, don't detach from the terminal. */
  39 bool do_detach = true;
  40 bool sigalrm = false;
  41
  42 extern char **g_argv;
  43 extern bool use_logfile;
  44
  45 /* Some functions the less gifted operating systems might lack... */
  46
  47 #ifdef HAVE_MINGW
  48 static SC_HANDLE manager = NULL;
  49 static SC_HANDLE service = NULL;
  50 static SERVICE_STATUS status = {0};
  51 static SERVICE_STATUS_HANDLE statushandle = 0;
  52
  53 static bool install_service(void) {
  54         char command[4096] = "\"";
  55         SERVICE_DESCRIPTION description = {"Virtual Private Network daemon"};
  56
  57         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
  58         if(!manager) {
  59                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open service manager: %s", winerror(GetLastError()));
  60                 return false;
  61         }
  62
  63         if(!strchr(program_name, '\\')) {
  64                 GetCurrentDirectory(sizeof command - 1, command + 1);
  65                 strncat(command, "\\", sizeof command - strlen(command));
  66         }
  67
  68         strncat(command, program_name, sizeof command - strlen(command));
  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                 strncat(command, *argp, sizeof command - strlen(command));
  80
  81                 if(space)
  82                         strncat(command, "\"", sizeof command - strlen(command));
  83         }
  84
  85         service = CreateService(manager, identname, identname,
  86                         SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, SERVICE_ERROR_NORMAL,
  87                         command, NULL, NULL, NULL, NULL, NULL);
  88
  89         if(!service) {
  90                 DWORD lasterror = GetLastError();
  91                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not create %s service: %s", identname, winerror(lasterror));
  92                 if(lasterror != ERROR_SERVICE_EXISTS)
  93                         return false;
  94         }
  95
  96         if(service) {
  97                 ChangeServiceConfig2(service, SERVICE_CONFIG_DESCRIPTION, &description);
  98                 logger(DEBUG_ALWAYS, LOG_INFO, "%s service installed", identname);
  99         } else {
 100                 service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
 101         }
 102
 103         if(!StartService(service, 0, NULL))
 104                 logger(DEBUG_ALWAYS, LOG_WARNING, "Could not start %s service: %s", identname, winerror(GetLastError()));
 105         else
 106                 logger(DEBUG_ALWAYS, LOG_INFO, "%s service started", identname);
 107
 108         return true;
 109 }
 110
 111 DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID boe, LPVOID bah) {
 112         switch(request) {
 113                 case SERVICE_CONTROL_INTERROGATE:
 114                         SetServiceStatus(statushandle, &status);
 115                         return NO_ERROR;
 116                 case SERVICE_CONTROL_STOP:
 117                         logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_STOP");
 118                         break;
 119                 case SERVICE_CONTROL_SHUTDOWN:
 120                         logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_SHUTDOWN");
 121                         break;
 122                 default:
 123                         logger(DEBUG_ALWAYS, LOG_WARNING, "Got unexpected request %d", (int)request);
 124                         return ERROR_CALL_NOT_IMPLEMENTED;
 125         }
 126
 127         event_exit();
 128         status.dwWaitHint = 30000;
 129         status.dwCurrentState = SERVICE_STOP_PENDING;
 130         SetServiceStatus(statushandle, &status);
 131         return NO_ERROR;
 132 }
 133
 134 VOID WINAPI run_service(DWORD argc, LPTSTR* argv) {
 135         extern int main2(int argc, char **argv);
 136
 137         status.dwServiceType = SERVICE_WIN32;
 138         status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
 139         status.dwWin32ExitCode = 0;
 140         status.dwServiceSpecificExitCode = 0;
 141         status.dwCheckPoint = 0;
 142
 143         statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
 144
 145         if (!statushandle) {
 146                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
 147         } else {
 148                 status.dwWaitHint = 30000;
 149                 status.dwCurrentState = SERVICE_START_PENDING;
 150                 SetServiceStatus(statushandle, &status);
 151
 152                 status.dwWaitHint = 0;
 153                 status.dwCurrentState = SERVICE_RUNNING;
 154                 SetServiceStatus(statushandle, &status);
 155
 156                 main2(argc, argv);
 157
 158                 status.dwWaitHint = 0;
 159                 status.dwCurrentState = SERVICE_STOPPED;
 160                 SetServiceStatus(statushandle, &status);
 161         }
 162
 163         return;
 164 }
 165
 166 bool init_service(void) {
 167         SERVICE_TABLE_ENTRY services[] = {
 168                 {identname, run_service},
 169                 {NULL, NULL}
 170         };
 171
 172         if(!StartServiceCtrlDispatcher(services)) {
 173                 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
 174                         return false;
 175                 }
 176                 else
 177                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "StartServiceCtrlDispatcher", winerror(GetLastError()));
 178         }
 179
 180         return true;
 181 }
 182 #endif
 183
 184 /*
 185   Detach from current terminal
 186 */
 187 bool detach(void) {
 188 #ifndef HAVE_MINGW
 189         signal(SIGPIPE, SIG_IGN);
 190         signal(SIGUSR1, SIG_IGN);
 191         signal(SIGUSR2, SIG_IGN);
 192         signal(SIGWINCH, SIG_IGN);
 193
 194         closelogger();
 195 #endif
 196
 197         if(do_detach) {
 198 #ifndef HAVE_MINGW
 199                 if(daemon(0, 0)) {
 200                         logger(DEBUG_ALWAYS, LOG_ERR, "Couldn't detach from terminal: %s", strerror(errno));
 201                         return false;
 202                 }
 203 #else
 204                 if(!statushandle)
 205                         exit(!install_service());
 206 #endif
 207         }
 208
 209         openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
 210
 211         logger(DEBUG_ALWAYS, LOG_NOTICE, "tincd %s (%s %s) starting, debug level %d",
 212                            VERSION, __DATE__, __TIME__, debug_level);
 213
 214         return true;
 215 }
 216
 217 bool execute_script(const char *name, char **envp) {
 218 #ifdef HAVE_SYSTEM
 219         char *scriptname;
 220         char *command;
 221
 222         xasprintf(&scriptname, "%s" SLASH "%s%s", confbase, name, scriptextension);
 223
 224         /* First check if there is a script */
 225
 226         if(access(scriptname, F_OK)) {
 227                 free(scriptname);
 228                 return true;
 229         }
 230
 231         logger(DEBUG_STATUS, LOG_INFO, "Executing script %s", name);
 232
 233 #ifdef HAVE_PUTENV
 234         /* Set environment */
 235
 236         for(int i = 0; envp[i]; i++)
 237                 putenv(envp[i]);
 238 #endif
 239
 240         if(scriptinterpreter)
 241                 xasprintf(&command, "%s \"%s\"", scriptinterpreter, scriptname);
 242         else
 243                 xasprintf(&command, "\"%s\"", scriptname);
 244
 245         int status = system(command);
 246
 247         free(command);
 248         free(scriptname);
 249
 250         /* Unset environment */
 251
 252         for(int i = 0; envp[i]; i++) {
 253                 char *e = strchr(envp[i], '=');
 254                 if(e) {
 255                         char p[e - envp[i] + 1];
 256                         strncpy(p, envp[i], e - envp[i]);
 257                         p[e - envp[i]] = '\0';
 258                         putenv(p);
 259                 }
 260         }
 261
 262         if(status != -1) {
 263 #ifdef WEXITSTATUS
 264                 if(WIFEXITED(status)) {          /* Child exited by itself */
 265                         if(WEXITSTATUS(status)) {
 266                                 logger(DEBUG_ALWAYS, LOG_ERR, "Script %s exited with non-zero status %d",
 267                                            name, WEXITSTATUS(status));
 268                                 return false;
 269                         }
 270                 } else if(WIFSIGNALED(status)) { /* Child was killed by a signal */
 271                         logger(DEBUG_ALWAYS, LOG_ERR, "Script %s was killed by signal %d (%s)",
 272                                    name, WTERMSIG(status), strsignal(WTERMSIG(status)));
 273                         return false;
 274                 } else {                         /* Something strange happened */
 275                         logger(DEBUG_ALWAYS, LOG_ERR, "Script %s terminated abnormally", name);
 276                         return false;
 277                 }
 278 #endif
 279         } else {
 280                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "system", strerror(errno));
 281                 return false;
 282         }
 283 #endif
 284         return true;
 285 }