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

   1 /*
   2     script.c -- call an external script
   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 "logger.h"
  25 #include "names.h"
  26 #include "script.h"
  27 #include "xalloc.h"
  28
  29 bool execute_script(const char *name, char **envp) {
  30 #ifdef HAVE_SYSTEM
  31         char *scriptname;
  32         char *command;
  33
  34         xasprintf(&scriptname, "%s" SLASH "%s%s", confbase, name, scriptextension);
  35
  36         /* First check if there is a script */
  37
  38 #ifdef HAVE_MINGW
  39         if(!*scriptextension) {
  40                 const char *pathext = getenv("PATHEXT") ?: ".COM;.EXE;.BAT;.CMD";
  41                 char fullname[strlen(scriptname) + strlen(pathext)];
  42                 char *ext = fullname + strlen(scriptname);
  43                 strcpy(fullname, scriptname);
  44
  45                 const char *p = pathext;
  46                 bool found = false;
  47                 while(p && *p) {
  48                         const char *q = strchr(p, ';');
  49                         if(q) {
  50                                 memcpy(ext, p, q - p);
  51                                 ext[q - p] = 0;
  52                                 q++;
  53                         } else {
  54                                 strcpy(ext, p);
  55                         }
  56                         if((found = !access(fullname, F_OK)))
  57                                 break;
  58                         p = q;
  59                 }
  60                 if(!found) {
  61                         free(scriptname);
  62                         return true;
  63                 }
  64         } else
  65 #endif
  66
  67         if(access(scriptname, F_OK)) {
  68                 free(scriptname);
  69                 return true;
  70         }
  71
  72         logger(DEBUG_STATUS, LOG_INFO, "Executing script %s", name);
  73
  74 #ifdef HAVE_PUTENV
  75         /* Set environment */
  76
  77         for(int i = 0; envp[i]; i++)
  78                 putenv(envp[i]);
  79 #endif
  80
  81         if(scriptinterpreter)
  82                 xasprintf(&command, "%s \"%s\"", scriptinterpreter, scriptname);
  83         else
  84                 xasprintf(&command, "\"%s\"", scriptname);
  85
  86         int status = system(command);
  87
  88         free(command);
  89         free(scriptname);
  90
  91         /* Unset environment */
  92
  93         for(int i = 0; envp[i]; i++) {
  94                 char *e = strchr(envp[i], '=');
  95                 if(e) {
  96                         char p[e - envp[i] + 1];
  97                         strncpy(p, envp[i], e - envp[i]);
  98                         p[e - envp[i]] = '\0';
  99                         putenv(p);
 100                 }
 101         }
 102
 103         if(status != -1) {
 104 #ifdef WEXITSTATUS
 105                 if(WIFEXITED(status)) {          /* Child exited by itself */
 106                         if(WEXITSTATUS(status)) {
 107                                 logger(DEBUG_ALWAYS, LOG_ERR, "Script %s exited with non-zero status %d",
 108                                            name, WEXITSTATUS(status));
 109                                 return false;
 110                         }
 111                 } else if(WIFSIGNALED(status)) { /* Child was killed by a signal */
 112                         logger(DEBUG_ALWAYS, LOG_ERR, "Script %s was killed by signal %d (%s)",
 113                                    name, WTERMSIG(status), strsignal(WTERMSIG(status)));
 114                         return false;
 115                 } else {                         /* Something strange happened */
 116                         logger(DEBUG_ALWAYS, LOG_ERR, "Script %s terminated abnormally", name);
 117                         return false;
 118                 }
 119 #endif
 120         } else {
 121                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "system", strerror(errno));
 122                 return false;
 123         }
 124 #endif
 125         return true;
 126 }