1 files changed, 166 insertions, 0 deletions
diff --git a/src/posix/sysExec.hpp b/src/posix/sysExec.hpp
new file mode 100644
index 0000000..506e03d
--- /dev/null
+++ b/src/posix/sysExec.hpp
@@ -0,0 +1,166 @@
+/*
+ *  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
+\ No newline at end of file