git.meshlink.io Git - meshlink/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 "net.h"
  27 #include "script.h"
  28 #include "xalloc.h"
  29
  30 bool execute_script(const char *name, char **envp) {
  31 #ifdef HAVE_SYSTEM
  32         char *scriptname;
  33         char *command;
  34
  35         xasprintf(&scriptname, "%s" SLASH "%s%s", confbase, name, scriptextension);
  36
  37         /* First check if there is a script */
  38
  39 #ifdef HAVE_MINGW
  40         if(!*scriptextension) {
  41                 const char *pathext = getenv("PATHEXT") ?: ".COM;.EXE;.BAT;.CMD";
  42                 char fullname[strlen(scriptname) + strlen(pathext)];
  43                 char *ext = fullname + strlen(scriptname);
  44                 strcpy(fullname, scriptname);
  45
  46                 const char *p = pathext;
  47                 bool found = false;
  48                 while(p && *p) {
  49                         const char *q = strchr(p, ';');
  50                         if(q) {
  51                                 memcpy(ext, p, q - p);
  52                                 ext[q - p] = 0;
  53                                 *q++;
  54                         } else {
  55                                 strcpy(ext, p);
  56                         }
  57                         if((found = !access(fullname, F_OK)))
  58                                 break;
  59                         p = q;
  60                 }
  61                 if(!found) {
  62                         free(scriptname);
  63                         return true;
  64                 }
  65         } else
  66 #endif
  67
  68         if(access(scriptname, F_OK)) {
  69                 free(scriptname);
  70                 return true;
  71         }
  72
  73         logger(DEBUG_STATUS, LOG_INFO, "Executing script %s", name);
  74
  75 #ifdef HAVE_PUTENV
  76         /* Set environment */
  77
  78         for(int i = 0; envp[i]; i++)
  79                 putenv(envp[i]);
  80 #endif
  81
  82         if(scriptinterpreter)
  83                 xasprintf(&command, "%s \"%s\"", scriptinterpreter, scriptname);
  84         else
  85                 xasprintf(&command, "\"%s\"", scriptname);
  86
  87         int status = system(command);
  88
  89         free(command);
  90         free(scriptname);
  91
  92         /* Unset environment */
  93
  94         for(int i = 0; envp[i]; i++) {
  95                 char *e = strchr(envp[i], '=');
  96                 if(e) {
  97                         char p[e - envp[i] + 1];
  98                         strncpy(p, envp[i], e - envp[i]);
  99                         p[e - envp[i]] = '\0';
 100                         putenv(p);
 101                 }
 102         }
 103
 104         if(status != -1) {
 105 #ifdef WEXITSTATUS
 106                 if(WIFEXITED(status)) {          /* Child exited by itself */
 107                         if(WEXITSTATUS(status)) {
 108                                 logger(DEBUG_ALWAYS, LOG_ERR, "Script %s exited with non-zero status %d",
 109                                            name, WEXITSTATUS(status));
 110                                 return false;
 111                         }
 112                 } else if(WIFSIGNALED(status)) { /* Child was killed by a signal */
 113                         logger(DEBUG_ALWAYS, LOG_ERR, "Script %s was killed by signal %d (%s)",
 114                                    name, WTERMSIG(status), strsignal(WTERMSIG(status)));
 115                         return false;
 116                 } else {                         /* Something strange happened */
 117                         logger(DEBUG_ALWAYS, LOG_ERR, "Script %s terminated abnormally", name);
 118                         return false;
 119                 }
 120 #endif
 121         } else {
 122                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "system", strerror(errno));
 123                 return false;
 124         }
 125 #endif
 126         return true;
 127 }