src/sysexec.hpp

   1 /*
   2  *  anytun
   3  *
   4  *  The secure anycast tunneling protocol (satp) defines a protocol used
   5  *  for communication between any combination of unicast and anycast
   6  *  tunnel endpoints.  It has less protocol overhead than IPSec in Tunnel
   7  *  mode and allows tunneling of every ETHER TYPE protocol (e.g.
   8  *  ethernet, ip, arp ...). satp directly includes cryptography and
   9  *  message authentication based on the methodes used by SRTP.  It is
  10  *  intended to deliver a generic, scaleable and secure solution for
  11  *  tunneling and relaying of packets of any protocol.
  12  *
  13  *
  14  *  Copyright (C) 2007-2008 Othmar Gsenger, Erwin Nindl,
  15  *                          Christian Pointner <satp@wirdorange.org>
  16  *
  17  *  This file is part of Anytun.
  18  *
  19  *  Anytun is free software: you can redistribute it and/or modify
  20  *  it under the terms of the GNU General Public License version 3 as
  21  *  published by the Free Software Foundation.
  22  *
  23  *  Anytun is distributed in the hope that it will be useful,
  24  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  25  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26  *  GNU General Public License for more details.
  27  *
  28  *  You should have received a copy of the GNU General Public License
  29  *  along with anytun.  If not, see <http://www.gnu.org/licenses/>.
  30  */
  31
  32 #ifndef _SYSEXEC_HPP
  33 #define _SYSEXEC_HPP
  34 #ifndef NOEXEC
  35
  36 int execScript(std::string const& script, std::string const& ifname)
  37 {
  38   pid_t pid;
  39   pid = fork();
  40   if(!pid) {
  41     int fd;
  42     for (fd=getdtablesize();fd>=0;--fd) // close all file descriptors
  43       close(fd);
  44
  45     fd = open("/dev/null",O_RDWR);        // stdin
  46     if(fd == -1)
  47       cLog.msg(Log::PRIO_WARNING) << "can't open stdin";
  48     else {
  49       if(dup(fd) == -1)   // stdout
  50         cLog.msg(Log::PRIO_WARNING) << "can't open stdout";
  51       if(dup(fd) == -1)   // stderr
  52         cLog.msg(Log::PRIO_WARNING) << "can't open stderr";
  53     }
  54     return execl("/bin/sh", "/bin/sh", script.c_str(), ifname.c_str(), NULL);
  55   }
  56   int status = 0;
  57   waitpid(pid, &status, 0);
  58   return status;
  59 }
  60
  61
  62 #endif
  63 #endif
  64