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

   1 /*
   2     process.c -- process management functions
   3     Copyright (C) 1999-2005 Ivo Timmermans,
   4                   2000-2011 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 "logger.h"
  29 #include "net.h"
  30 #include "node.h"
  31 #include "process.h"
  32 #include "subnet.h"
  33 #include "utils.h"
  34 #include "xalloc.h"
  35
  36 /* If zero, don't detach from the terminal. */
  37 bool do_detach = true;
  38 bool sigalrm = false;
  39
  40 extern char *identname;
  41 extern char **g_argv;
  42 extern bool use_logfile;
  43
  44 /* Some functions the less gifted operating systems might lack... */
  45
  46 #ifdef HAVE_MINGW
  47 extern char *identname;
  48 extern char *program_name;
  49 extern char **g_argv;
  50
  51 static SC_HANDLE manager = NULL;
  52 static SC_HANDLE service = NULL;
  53 static SERVICE_STATUS status = {0};
  54 static SERVICE_STATUS_HANDLE statushandle = 0;
  55
  56 static bool install_service(void) {
  57         char command[4096] = "\"";
  58         SERVICE_DESCRIPTION description = {"Virtual Private Network daemon"};
  59
  60         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
  61         if(!manager) {
  62                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open service manager: %s", winerror(GetLastError()));
  63                 return false;
  64         }
  65
  66         if(!strchr(program_name, '\\')) {
  67                 GetCurrentDirectory(sizeof command - 1, command + 1);
  68                 strncat(command, "\\", sizeof command - strlen(command));
  69         }
  70
  71         strncat(command, program_name, sizeof command - strlen(command));
  72
  73         strncat(command, "\"", sizeof command - strlen(command));
  74
  75         for(char **argp = g_argv + 1; *argp; argp++) {
  76                 char &space = strchr(*argp, ' ');
  77                 strncat(command, " ", sizeof command - strlen(command));
  78
  79                 if(space)
  80                         strncat(command, "\"", sizeof command - strlen(command));
  81
  82                 strncat(command, *argp, sizeof command - strlen(command));
  83
  84                 if(space)
  85                         strncat(command, "\"", sizeof command - strlen(command));
  86         }
  87
  88         service = CreateService(manager, identname, identname,
  89                         SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, SERVICE_ERROR_NORMAL,
  90                         command, NULL, NULL, NULL, NULL, NULL);
  91
  92         if(!service) {
  93                 DWORD lasterror = GetLastError();
  94                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not create %s service: %s", identname, winerror(lasterror));
  95                 if(lasterror != ERROR_SERVICE_EXISTS)
  96                         return false;
  97         }
  98
  99         if(service) {
 100                 ChangeServiceConfig2(service, SERVICE_CONFIG_DESCRIPTION, &description);
 101                 logger(DEBUG_ALWAYS, LOG_INFO, "%s service installed", identname);
 102         } else {
 103                 service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
 104         }
 105
 106         if(!StartService(service, 0, NULL))
 107                 logger(DEBUG_ALWAYS, LOG_WARNING, "Could not start %s service: %s", identname, winerror(GetLastError()));
 108         else
 109                 logger(DEBUG_ALWAYS, LOG_INFO, "%s service started", identname);
 110
 111         return true;
 112 }
 113
 114 DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID boe, LPVOID bah) {
 115         switch(request) {
 116                 case SERVICE_CONTROL_INTERROGATE:
 117                         SetServiceStatus(statushandle, &status);
 118                         return NO_ERROR;
 119                 case SERVICE_CONTROL_STOP:
 120                         logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_STOP");
 121                         break;
 122                 case SERVICE_CONTROL_SHUTDOWN:
 123                         logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_SHUTDOWN");
 124                         break;
 125                 default:
 126                         logger(DEBUG_ALWAYS, LOG_WARNING, "Got unexpected request %d", request);
 127                         return ERROR_CALL_NOT_IMPLEMENTED;
 128         }
 129
 130         event_loopexit(NULL);
 131         status.dwWaitHint = 30000;
 132         status.dwCurrentState = SERVICE_STOP_PENDING;
 133         SetServiceStatus(statushandle, &status);
 134         return NO_ERROR;
 135 }
 136
 137 VOID WINAPI run_service(DWORD argc, LPTSTR* argv) {
 138         int err = 1;
 139         extern int main2(int argc, char **argv);
 140
 141
 142         status.dwServiceType = SERVICE_WIN32;
 143         status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
 144         status.dwWin32ExitCode = 0;
 145         status.dwServiceSpecificExitCode = 0;
 146         status.dwCheckPoint = 0;
 147
 148         statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
 149
 150         if (!statushandle) {
 151                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
 152                 err = 1;
 153         } else {
 154                 status.dwWaitHint = 30000;
 155                 status.dwCurrentState = SERVICE_START_PENDING;
 156                 SetServiceStatus(statushandle, &status);
 157
 158                 status.dwWaitHint = 0;
 159                 status.dwCurrentState = SERVICE_RUNNING;
 160                 SetServiceStatus(statushandle, &status);
 161
 162                 err = main2(argc, argv);
 163
 164                 status.dwWaitHint = 0;
 165                 status.dwCurrentState = SERVICE_STOPPED;
 166                 //status.dwWin32ExitCode = err;
 167                 SetServiceStatus(statushandle, &status);
 168         }
 169
 170         return;
 171 }
 172
 173 bool init_service(void) {
 174         SERVICE_TABLE_ENTRY services[] = {
 175                 {identname, run_service},
 176                 {NULL, NULL}
 177         };
 178
 179         if(!StartServiceCtrlDispatcher(services)) {
 180                 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
 181                         return false;
 182                 }
 183                 else
 184                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "StartServiceCtrlDispatcher", winerror(GetLastError()));
 185         }
 186
 187         return true;
 188 }
 189 #endif
 190
 191 /*
 192   Detach from current terminal
 193 */
 194 bool detach(void) {
 195 #ifndef HAVE_MINGW
 196         signal(SIGPIPE, SIG_IGN);
 197         signal(SIGUSR1, SIG_IGN);
 198         signal(SIGUSR2, SIG_IGN);
 199         signal(SIGWINCH, SIG_IGN);
 200
 201         closelogger();
 202 #endif
 203
 204         if(do_detach) {
 205 #ifndef HAVE_MINGW
 206                 if(daemon(0, 0)) {
 207                         fprintf(stderr, "Couldn't detach from terminal: %s",
 208                                         strerror(errno));
 209                         return false;
 210                 }
 211 #else
 212                 if(!statushandle)
 213                         exit(!install_service());
 214 #endif
 215         }
 216
 217         openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
 218
 219         logger(DEBUG_ALWAYS, LOG_NOTICE, "tincd %s (%s %s) starting, debug level %d",
 220                            VERSION, __DATE__, __TIME__, debug_level);
 221
 222         return true;
 223 }
 224
 225 bool execute_script(const char *name, char **envp) {
 226 #ifdef HAVE_SYSTEM
 227         char *scriptname;
 228         char *command;
 229
 230         xasprintf(&scriptname, "%s" SLASH "%s%s", confbase, name, scriptextension);
 231
 232         /* First check if there is a script */
 233
 234         if(access(scriptname, F_OK)) {
 235                 free(scriptname);
 236                 return true;
 237         }
 238
 239         logger(DEBUG_STATUS, LOG_INFO, "Executing script %s", name);
 240
 241 #ifdef HAVE_PUTENV
 242         /* Set environment */
 243
 244         for(int i = 0; envp[i]; i++)
 245                 putenv(envp[i]);
 246 #endif
 247
 248         if(scriptinterpreter)
 249                 xasprintf(&command, "%s \"%s\"", scriptinterpreter, scriptname);
 250         else
 251                 xasprintf(&command, "\"%s\"", scriptname);
 252
 253         int status = system(command);
 254
 255         free(command);
 256         free(scriptname);
 257
 258         /* Unset environment */
 259
 260         for(int i = 0; envp[i]; i++) {
 261                 char *e = strchr(envp[i], '=');
 262                 if(e) {
 263                         char p[e - envp[i] + 1];
 264                         strncpy(p, envp[i], e - envp[i]);
 265                         p[e - envp[i]] = '\0';
 266                         putenv(p);
 267                 }
 268         }
 269
 270 #ifdef WEXITSTATUS
 271         if(status != -1) {
 272                 if(WIFEXITED(status)) {          /* Child exited by itself */
 273                         if(WEXITSTATUS(status)) {
 274                                 logger(DEBUG_ALWAYS, LOG_ERR, "Script %s exited with non-zero status %d",
 275                                            name, WEXITSTATUS(status));
 276                                 return false;
 277                         }
 278                 } else if(WIFSIGNALED(status)) { /* Child was killed by a signal */
 279                         logger(DEBUG_ALWAYS, LOG_ERR, "Script %s was killed by signal %d (%s)",
 280                                    name, WTERMSIG(status), strsignal(WTERMSIG(status)));
 281                         return false;
 282                 } else {                         /* Something strange happened */
 283                         logger(DEBUG_ALWAYS, LOG_ERR, "Script %s terminated abnormally", name);
 284                         return false;
 285                 }
 286         } else {
 287                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "system", strerror(errno));
 288                 return false;
 289         }
 290 #endif
 291 #endif
 292         return true;
 293 }