X-Git-Url: https://git.syn-net.org/debian/?a=blobdiff_plain;f=src%2Fposix%2FsysExec.hpp;fp=src%2Fposix%2FsysExec.hpp;h=18fde97707d9f504876a3024c5de32c0e779b851;hb=ece844834d2cecc028ce81ca283f5d441088580e;hp=0000000000000000000000000000000000000000;hpb=bb834fe0ed7a38b724f49b944adb801634eb6194;p=anytun.git

diff --git a/src/posix/sysExec.hpp b/src/posix/sysExec.hpp
new file mode 100644
index 0000000..18fde97
--- /dev/null
+++ b/src/posix/sysExec.hpp
@@ -0,0 +1,186 @@
+/*
+ *  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_);
+}
+
+
+template<class T>
+char** dupSysStringArray(T const& array)
+{
+  char** new_array;
+  new_array = static_cast<char**>(malloc((array.size() + 1)*sizeof(char*)));
+  if(!new_array)
+    return NULL;
+
+  unsigned int i = 0;
+  for(typename T::const_iterator it = array.begin(); it != array.end(); ++it) {
+    new_array[i] = strdup(it->c_str());
+    if(!new_array) {
+      while(i--)
+        free(new_array[i]);
+      free(new_array);
+      return NULL;
+    }
+    ++i;
+  }
+  new_array[array.size()] = NULL;
+  return new_array;
+}
+
+void freeSysStringArray(char** array)
+{
+  if(!array)
+    return;
+
+  for(int i=0; array[i] ; ++i)
+    free(array[i]);
+
+  free(array);
+}
+
+void SysExec::doExec(StringVector args, StringList 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";
+  }
+  
+  args.insert(args.begin(), script_);
+  char** argv = dupSysStringArray(args);
+  char** evp = dupSysStringArray(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
+  
+  freeSysStringArray(argv);
+  freeSysStringArray(evp);
+
+  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_ERROR) << "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 if(WIFSTOPPED(s->return_code_))
+    cLog.msg(Log::PRIO_NOTICE) << "script '" << s->script_ << "' stopped after signal " << WSTOPSIG(s->return_code_);
+  else if(WIFCONTINUED(s->return_code_))
+    cLog.msg(Log::PRIO_NOTICE) << "script '" << s->script_ << "' continued after SIGCONT";
+
+  delete(s);
+  s = NULL;
+}
+
+#endif // ANYTUN_sysexec_hpp_INCLUDED