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 "node.h"
  30 #include "process.h"
  31 #include "subnet.h"
  32 #include "utils.h"
  33 #include "xalloc.h"
  34
  35 /* If zero, don't detach from the terminal. */
  36 bool do_detach = true;
  37 bool sigalrm = false;
  38
  39 extern char *identname;
  40 extern char **g_argv;
  41 extern bool use_logfile;
  42
  43 /* Some functions the less gifted operating systems might lack... */
  44
  45 #ifdef HAVE_MINGW
  46 extern char *identname;
  47 extern char *program_name;
  48 extern char **g_argv;
  49
  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 bool install_service(void) {
  56         char command[4096] = "\"";
  57         char **argp;
  58         bool space;
  59         SERVICE_DESCRIPTION description = {"Virtual Private Network daemon"};
  60
  61         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
  62         if(!manager) {
  63                 logger(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(argp = g_argv + 1; *argp; argp++) {
  77                 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(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(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(LOG_WARNING, "Could not start %s service: %s", identname, winerror(GetLastError()));
 109         else
 110                 logger(LOG_INFO, "%s service started", identname);
 111
 112         return true;
 113 }
 114
 115 bool remove_service(void) {
 116         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
 117         if(!manager) {
 118                 logger(LOG_ERR, "Could not open service manager: %s", winerror(GetLastError()));
 119                 return false;
 120         }
 121
 122         service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
 123
 124         if(!service) {
 125                 logger(LOG_ERR, "Could not open %s service: %s", identname, winerror(GetLastError()));
 126                 return false;
 127         }
 128
 129         if(!ControlService(service, SERVICE_CONTROL_STOP, &status))
 130                 logger(LOG_ERR, "Could not stop %s service: %s", identname, winerror(GetLastError()));
 131         else
 132                 logger(LOG_INFO, "%s service stopped", identname);
 133
 134         if(!DeleteService(service)) {
 135                 logger(LOG_ERR, "Could not remove %s service: %s", identname, winerror(GetLastError()));
 136                 return false;
 137         }
 138
 139         logger(LOG_INFO, "%s service removed", identname);
 140
 141         return true;
 142 }
 143
 144 DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID boe, LPVOID bah) {
 145         switch(request) {
 146                 case SERVICE_CONTROL_INTERROGATE:
 147                         SetServiceStatus(statushandle, &status);
 148                         return NO_ERROR;
 149                 case SERVICE_CONTROL_STOP:
 150                         logger(LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_STOP");
 151                         break;
 152                 case SERVICE_CONTROL_SHUTDOWN:
 153                         logger(LOG_NOTICE, "Got %s request", "SERVICE_CONTROL_SHUTDOWN");
 154                         break;
 155                 default:
 156                         logger(LOG_WARNING, "Got unexpected request %d", request);
 157                         return ERROR_CALL_NOT_IMPLEMENTED;
 158         }
 159
 160         event_loopexit(NULL);
 161         status.dwWaitHint = 30000;
 162         status.dwCurrentState = SERVICE_STOP_PENDING;
 163         SetServiceStatus(statushandle, &status);
 164         return NO_ERROR;
 165 }
 166
 167 VOID WINAPI run_service(DWORD argc, LPTSTR* argv) {
 168         int err = 1;
 169         extern int main2(int argc, char **argv);
 170
 171
 172         status.dwServiceType = SERVICE_WIN32;
 173         status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
 174         status.dwWin32ExitCode = 0;
 175         status.dwServiceSpecificExitCode = 0;
 176         status.dwCheckPoint = 0;
 177
 178         statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL);
 179
 180         if (!statushandle) {
 181                 logger(LOG_ERR, "System call `%s' failed: %s", "RegisterServiceCtrlHandlerEx", winerror(GetLastError()));
 182                 err = 1;
 183         } else {
 184                 status.dwWaitHint = 30000;
 185                 status.dwCurrentState = SERVICE_START_PENDING;
 186                 SetServiceStatus(statushandle, &status);
 187
 188                 status.dwWaitHint = 0;
 189                 status.dwCurrentState = SERVICE_RUNNING;
 190                 SetServiceStatus(statushandle, &status);
 191
 192                 err = main2(argc, argv);
 193
 194                 status.dwWaitHint = 0;
 195                 status.dwCurrentState = SERVICE_STOPPED;
 196                 //status.dwWin32ExitCode = err;
 197                 SetServiceStatus(statushandle, &status);
 198         }
 199
 200         return;
 201 }
 202
 203 bool init_service(void) {
 204         SERVICE_TABLE_ENTRY services[] = {
 205                 {identname, run_service},
 206                 {NULL, NULL}
 207         };
 208
 209         if(!StartServiceCtrlDispatcher(services)) {
 210                 if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
 211                         return false;
 212                 }
 213                 else
 214                         logger(LOG_ERR, "System call `%s' failed: %s", "StartServiceCtrlDispatcher", winerror(GetLastError()));
 215         }
 216
 217         return true;
 218 }
 219 #endif
 220
 221 /*
 222   Detach from current terminal
 223 */
 224 bool detach(void) {
 225         setup_signals();
 226
 227 #ifndef HAVE_MINGW
 228         closelogger();
 229 #endif
 230
 231         if(do_detach) {
 232 #ifndef HAVE_MINGW
 233                 if(daemon(0, 0)) {
 234                         fprintf(stderr, "Couldn't detach from terminal: %s",
 235                                         strerror(errno));
 236                         return false;
 237                 }
 238 #else
 239                 if(!statushandle)
 240                         exit(install_service());
 241 #endif
 242         }
 243
 244         openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
 245
 246         logger(LOG_NOTICE, "tincd %s (%s %s) starting, debug level %d",
 247                            VERSION, __DATE__, __TIME__, debug_level);
 248
 249         return true;
 250 }
 251
 252 bool execute_script(const char *name, char **envp) {
 253 #ifdef HAVE_SYSTEM
 254         int status, len;
 255         char *scriptname;
 256         int i;
 257
 258 #ifndef HAVE_MINGW
 259         len = xasprintf(&scriptname, "\"%s/%s\"", confbase, name);
 260 #else
 261         len = xasprintf(&scriptname, "\"%s/%s.bat\"", confbase, name);
 262 #endif
 263         if(len < 0)
 264                 return false;
 265
 266         scriptname[len - 1] = '\0';
 267
 268 #ifndef HAVE_TUNEMU
 269         /* First check if there is a script */
 270
 271         if(access(scriptname + 1, F_OK)) {
 272                 free(scriptname);
 273                 return true;
 274         }
 275 #endif
 276
 277         ifdebug(STATUS) logger(LOG_INFO, "Executing script %s", name);
 278
 279 #ifdef HAVE_PUTENV
 280         /* Set environment */
 281
 282         for(i = 0; envp[i]; i++)
 283                 putenv(envp[i]);
 284 #endif
 285
 286         scriptname[len - 1] = '\"';
 287         status = system(scriptname);
 288
 289         free(scriptname);
 290
 291         /* Unset environment */
 292
 293         for(i = 0; envp[i]; i++) {
 294                 char *e = strchr(envp[i], '=');
 295                 if(e) {
 296                         char p[e - envp[i] + 1];
 297                         strncpy(p, envp[i], e - envp[i]);
 298                         p[e - envp[i]] = '\0';
 299                         putenv(p);
 300                 }
 301         }
 302
 303 #ifdef WEXITSTATUS
 304         if(status != -1) {
 305                 if(WIFEXITED(status)) { /* Child exited by itself */
 306                         if(WEXITSTATUS(status)) {
 307                                 logger(LOG_ERR, "Script %s exited with non-zero status %d",
 308                                            name, WEXITSTATUS(status));
 309                                 return false;
 310                         }
 311                 } else if(WIFSIGNALED(status)) {        /* Child was killed by a signal */
 312                         logger(LOG_ERR, "Script %s was killed by signal %d (%s)",
 313                                    name, WTERMSIG(status), strsignal(WTERMSIG(status)));
 314                         return false;
 315                 } else {                        /* Something strange happened */
 316                         logger(LOG_ERR, "Script %s terminated abnormally", name);
 317                         return false;
 318                 }
 319         } else {
 320                 logger(LOG_ERR, "System call `%s' failed: %s", "system", strerror(errno));
 321                 return false;
 322         }
 323 #endif
 324 #endif
 325         return true;
 326 }
 327
 328
 329 /*
 330   Signal handlers.
 331 */
 332
 333 #ifndef HAVE_MINGW
 334 static RETSIGTYPE ignore_signal_handler(int a) {
 335         ifdebug(SCARY_THINGS) logger(LOG_DEBUG, "Ignored signal %d (%s)", a, strsignal(a));
 336 }
 337
 338 static struct {
 339         int signal;
 340         void (*handler)(int);
 341 } sighandlers[] = {
 342         {SIGPIPE, ignore_signal_handler},
 343         {SIGCHLD, ignore_signal_handler},
 344         {0, NULL}
 345 };
 346 #endif
 347
 348 void setup_signals(void) {
 349 #ifndef HAVE_MINGW
 350         int i;
 351         struct sigaction act = {{NULL}};
 352
 353         sigemptyset(&act.sa_mask);
 354
 355         for(i = 0; sighandlers[i].signal; i++) {
 356                 act.sa_handler = sighandlers[i].handler;
 357                 if(sigaction(sighandlers[i].signal, &act, NULL) < 0)
 358                         fprintf(stderr, "Installing signal handler for signal %d (%s) failed: %s\n",
 359                                         sighandlers[i].signal, strsignal(sighandlers[i].signal),
 360                                         strerror(errno));
 361         }
 362 #endif
 363 }