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/*
* anytun
*
* The secure anycast tunneling protocol (satp) defines a protocol used
* for communication between any combination of unicast and anycast
* tunnel endpoints. It has less protocol overhead than IPSec in Tunnel
* mode and allows tunneling of every ETHER TYPE protocol (e.g.
* ethernet, ip, arp ...). satp directly includes cryptography and
* message authentication based on the methodes used by SRTP. It is
* intended to deliver a generic, scaleable and secure solution for
* tunneling and relaying of packets of any protocol.
*
*
* Copyright (C) 2007-2009 Othmar Gsenger, Erwin Nindl,
* Christian Pointner <satp@wirdorange.org>
*
* This file is part of Anytun.
*
* Anytun is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* Anytun is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with anytun. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#ifndef ANYTUN_sysexec_hpp_INCLUDED
#define ANYTUN_sysexec_hpp_INCLUDED
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/wait.h>
#include <sys/select.h>
#include <stdlib.h>
#include <string.h>
#include <cstring>
SysExec::~SysExec()
{
if(!closed_)
close(pipefd_);
}
char** dupEnv(StringList const& env)
{
char** evp;
evp = new char*[env.size() + 1];
unsigned int i = 0;
for(StringList::const_iterator it = env.begin(); it != env.end(); ++it) {
evp[i] = new char[it->size() + 1];
std::strcpy(evp[i], it->c_str());
++i;
}
evp[env.size()] = NULL;
return evp;
}
void SysExec::doExec(std::string const& script, StringVector const& args, StringList const& env)
{
int pipefd[2];
if(pipe(pipefd) == -1) {
cLog.msg(Log::PRIO_ERROR) << "executing script '" << script << "' pipe() error: " << AnytunErrno(errno);
return;
}
pid_ = fork();
if(pid_ == -1) {
cLog.msg(Log::PRIO_ERROR) << "executing script '" << script << "' fork() error: " << AnytunErrno(errno);
return;
}
if(pid_) {
close(pipefd[1]);
pipefd_=pipefd[0];
// parent exits here, call waitForScript to cleanup up zombie
return;
}
// child code, exec the script
int fd;
for (fd=getdtablesize();fd>=0;--fd) // close all file descriptors
if(fd != pipefd[1]) close(fd);
fd = open("/dev/null",O_RDWR); // stdin
if(fd == -1)
cLog.msg(Log::PRIO_WARNING) << "can't open stdin";
else {
if(dup(fd) == -1) // stdout
cLog.msg(Log::PRIO_WARNING) << "can't open stdout";
if(dup(fd) == -1) // stderr
cLog.msg(Log::PRIO_WARNING) << "can't open stderr";
}
char** argv = new char*[args.size() + 2];
argv[0] = new char[script.size() + 1];
std::strcpy(argv[0], script.c_str());
for(unsigned int i=0; i<args.size(); ++i) {
argv[i+1] = new char[args[i].size() + 1];
std::strcpy(argv[i+1], args[i].c_str());
}
argv[args.size() + 1] = NULL;
char** evp = dupEnv(env);
execve(script.c_str(), argv, evp);
// if execve returns, an error occurred, but logging doesn't work
// because we closed all file descriptors, so just write errno to
// pipe and call exit
int err = errno;
int ret = write(pipefd[1], (void*)(&err), sizeof(err));
if(ret != sizeof(errno))
exit(-2);
exit(-1);
}
int SysExec::waitForScript()
{
int status = 0;
waitpid(pid_, &status, 0);
fd_set rfds;
FD_ZERO(&rfds);
FD_SET(pipefd_, &rfds);
struct timeval tv = { 0 , 0 };
if(select(pipefd_+1, &rfds, NULL, NULL, &tv) == 1) {
int err = 0;
if(read(pipefd_, (void*)(&err), sizeof(err)) >= static_cast<int>(sizeof(err))) {
cLog.msg(Log::PRIO_NOTICE) << "script '" << script_ << "' exec() error: " << AnytunErrno(err);
close(pipefd_);
return_code_ = -1;
return return_code_;
}
}
close(pipefd_);
closed_ = true;
return_code_ = status;
return return_code_;
}
void SysExec::waitAndDestroy(SysExec*& s)
{
if(!s)
return;
s->waitForScript();
if(WIFEXITED(s->return_code_))
cLog.msg(Log::PRIO_NOTICE) << "script '" << s->script_ << "' returned " << WEXITSTATUS(s->return_code_);
else if(WIFSIGNALED(s->return_code_))
cLog.msg(Log::PRIO_NOTICE) << "script '" << s->script_ << "' terminated after signal " << WTERMSIG(s->return_code_);
else
cLog.msg(Log::PRIO_ERROR) << "executing script '" << s->script_ << "': unknown error";
delete(s);
s = NULL;
}
#endif // ANYTUN_sysexec_hpp_INCLUDED
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