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

   1 /*
   2     process.c -- process management functions
   3     Copyright (C) 1999-2005 Ivo Timmermans,
   4                   2000-2012 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 "net.h"
  31 #include "node.h"
  32 #include "process.h"
  33 #include "subnet.h"
  34 #include "utils.h"
  35 #include "xalloc.h"
  36
  37 /* If zero, don't detach from the terminal. */
  38 bool do_detach = true;
  39 bool sigalrm = false;
  40
  41 extern char *identname;
  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 extern char *identname;
  49 extern char *program_name;
  50 extern char **g_argv;
  51
  52 static SC_HANDLE manager = NULL;
  53 static SC_HANDLE service = NULL;
  54 static SERVICE_STATUS status = {0};
  55 static SERVICE_STATUS_HANDLE statushandle = 0;
  56
  57 static bool install_service(void) {
  58         char command[4096] = "\"";
  59         SERVICE_DESCRIPTION description = {"Virtual Private Network daemon"};
  60
  61         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
  62         if(!manager) {
  63                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open service manager: %s", winerror(GetLastError()));
  64                 return false;
  65         }
  66
  67         if(!strchr(program_name, '\\')) {
  68                 GetCurrentDirectory(sizeof command - 1, command + 1);
  69                 strncat(command, "\\", sizeof command - strlen(command));
  70         }
  71
  72         strncat(command, program_name, sizeof command - strlen(command));
  73
  74         strncat(command, "\"", sizeof command - strlen(command));
  75
  76         for(char **argp = g_argv + 1; *argp; argp++) {
  77                 char *space = strchr(*argp, ' ');
  78                 strncat(command, " ", sizeof command - strlen(command));
  79
  80                 if(space)
  81                         strncat(command, "\"", sizeof command - strlen(command));
  82
  83                 strncat(command, *argp, sizeof command - strlen(command));
  84
  85                 if(space)
  86                         strncat(command, "\"", sizeof command - strlen(command));
  87         }
  88
  89         service = CreateService(manager, identname, identname,
  90                         SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, SERVICE_ERROR_NORMAL,
  91                         command, NULL, NULL, NULL, NULL, NULL);
  92
  93         if(!service) {
  94                 DWORD lasterror = GetLastError();
  95                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not create %s service: %s", identname, winerror(lasterror));
  96                 if(lasterror != ERROR_SERVICE_EXISTS)
  97                         return false;
  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         return true;
 113 }
 114
 115 DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID boe, LPVOID bah) {
 116         switch(request) {
 117                 case SERVICE_CONTROL_INTERROGATE:
 118                         SetServiceStatus(statushandle, &status);
 119                         return NO_ERROR;
 120                 case SERVICE_CONTROL_STOP:
 121                         logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_STOP");
 122                         break;
 123                 case SERVICE_CONTROL_SHUTDOWN:
 124                         logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_SHUTDOWN");
 125                         break;
 126                 default:
 127                         logger(DEBUG_ALWAYS, LOG_WARNING, "Got unexpected request %d", (int)request);
 128                         return ERROR_CALL_NOT_IMPLEMENTED;
 129         }
 130
 131         event_exit();
 132         status.dwWaitHint = 30000;
 133         status.dwCurrentState = SERVICE_STOP_PENDING;
 134         SetServiceStatus(statushandle, &status);
 135         return NO_ERROR;
 136 }
 137
 138 VOID WINAPI run_service(DWORD argc, LPTSTR* argv) {
 139         extern int main2(int argc, char **argv);
 140
 141         status.dwServiceType = SERVICE_WIN32;
 142         status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
 143         status.dwWin32ExitCode = 0;
 144         status.dwServiceSpecificExitCode = 0;
 145         status.dwCheckPoint = 0;
 146
 147         statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
 148
 149         if (!statushandle) {
 150                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
 151         } else {
 152                 status.dwWaitHint = 30000;
 153                 status.dwCurrentState = SERVICE_START_PENDING;
 154                 SetServiceStatus(statushandle, &status);
 155
 156                 status.dwWaitHint = 0;
 157                 status.dwCurrentState = SERVICE_RUNNING;
 158                 SetServiceStatus(statushandle, &status);
 159
 160                 main2(argc, argv);
 161
 162                 status.dwWaitHint = 0;
 163                 status.dwCurrentState = SERVICE_STOPPED;
 164                 SetServiceStatus(statushandle, &status);
 165         }
 166
 167         return;
 168 }
 169
 170 bool init_service(void) {
 171         SERVICE_TABLE_ENTRY services[] = {
 172                 {identname, run_service},
 173                 {NULL, NULL}
 174         };
 175
 176         if(!StartServiceCtrlDispatcher(services)) {
 177                 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
 178                         return false;
 179                 }
 180                 else
 181                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "StartServiceCtrlDispatcher", winerror(GetLastError()));
 182         }
 183
 184         return true;
 185 }
 186 #endif
 187
 188 /*
 189   Detach from current terminal
 190 */
 191 bool detach(void) {
 192 #ifndef HAVE_MINGW
 193         signal(SIGPIPE, SIG_IGN);
 194         signal(SIGUSR1, SIG_IGN);
 195         signal(SIGUSR2, SIG_IGN);
 196         signal(SIGWINCH, SIG_IGN);
 197
 198         closelogger();
 199 #endif
 200
 201         if(do_detach) {
 202 #ifndef HAVE_MINGW
 203                 if(daemon(0, 0)) {
 204                         logger(DEBUG_ALWAYS, LOG_ERR, "Couldn't detach from terminal: %s", strerror(errno));
 205                         return false;
 206                 }
 207 #else
 208                 if(!statushandle)
 209                         exit(!install_service());
 210 #endif
 211         }
 212
 213         openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
 214
 215         logger(DEBUG_ALWAYS, LOG_NOTICE, "tincd %s (%s %s) starting, debug level %d",
 216                            VERSION, __DATE__, __TIME__, debug_level);
 217
 218         return true;
 219 }
 220
 221 bool execute_script(const char *name, char **envp) {
 222 #ifdef HAVE_SYSTEM
 223         char *scriptname;
 224         char *command;
 225
 226         xasprintf(&scriptname, "%s" SLASH "%s%s", confbase, name, scriptextension);
 227
 228         /* First check if there is a script */
 229
 230         if(access(scriptname, F_OK)) {
 231                 free(scriptname);
 232                 return true;
 233         }
 234
 235         logger(DEBUG_STATUS, LOG_INFO, "Executing script %s", name);
 236
 237 #ifdef HAVE_PUTENV
 238         /* Set environment */
 239
 240         for(int i = 0; envp[i]; i++)
 241                 putenv(envp[i]);
 242 #endif
 243
 244         if(scriptinterpreter)
 245                 xasprintf(&command, "%s \"%s\"", scriptinterpreter, scriptname);
 246         else
 247                 xasprintf(&command, "\"%s\"", scriptname);
 248
 249         int status = system(command);
 250
 251         free(command);
 252         free(scriptname);
 253
 254         /* Unset environment */
 255
 256         for(int i = 0; envp[i]; i++) {
 257                 char *e = strchr(envp[i], '=');
 258                 if(e) {
 259                         char p[e - envp[i] + 1];
 260                         strncpy(p, envp[i], e - envp[i]);
 261                         p[e - envp[i]] = '\0';
 262                         putenv(p);
 263                 }
 264         }
 265
 266 #ifdef WEXITSTATUS
 267         if(status != -1) {
 268                 if(WIFEXITED(status)) {          /* Child exited by itself */
 269                         if(WEXITSTATUS(status)) {
 270                                 logger(DEBUG_ALWAYS, LOG_ERR, "Script %s exited with non-zero status %d",
 271                                            name, WEXITSTATUS(status));
 272                                 return false;
 273                         }
 274                 } else if(WIFSIGNALED(status)) { /* Child was killed by a signal */
 275                         logger(DEBUG_ALWAYS, LOG_ERR, "Script %s was killed by signal %d (%s)",
 276                                    name, WTERMSIG(status), strsignal(WTERMSIG(status)));
 277                         return false;
 278                 } else {                         /* Something strange happened */
 279                         logger(DEBUG_ALWAYS, LOG_ERR, "Script %s terminated abnormally", name);
 280                         return false;
 281                 }
 282         } else {
 283                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "system", strerror(errno));
 284                 return false;
 285         }
 286 #endif
 287 #endif
 288         return true;
 289 }