--- /dev/null
+/*
+ * 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
projects / anytun.git / blobdiff