4 * uAnytun is a tiny implementation of SATP. Unlike Anytun which is a full
5 * featured implementation uAnytun has no support for multiple connections
6 * or synchronisation. It is a small single threaded implementation intended
7 * to act as a client on small platforms.
8 * The secure anycast tunneling protocol (satp) defines a protocol used
9 * for communication between any combination of unicast and anycast
10 * tunnel endpoints. It has less protocol overhead than IPSec in Tunnel
11 * mode and allows tunneling of every ETHER TYPE protocol (e.g.
12 * ethernet, ip, arp ...). satp directly includes cryptography and
13 * message authentication based on the methodes used by SRTP. It is
14 * intended to deliver a generic, scaleable and secure solution for
15 * tunneling and relaying of packets of any protocol.
18 * Copyright (C) 2007-2010 Christian Pointner <equinox@anytun.org>
20 * This file is part of uAnytun.
22 * uAnytun is free software: you can redistribute it and/or modify
23 * it under the terms of the GNU General Public License as published by
24 * the Free Software Foundation, either version 3 of the License, or
27 * uAnytun is distributed in the hope that it will be useful,
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
30 * GNU General Public License for more details.
32 * You should have received a copy of the GNU General Public License
33 * along with uAnytun. If not, see <http://www.gnu.org/licenses/>.
36 #include "datatypes.h"
38 #include <sys/types.h>
43 #include <sys/select.h>
50 int uanytun_exec(const char* script, char* const argv[], char* const evp[])
56 if(pipe(pipefd) == -1) {
57 log_printf(ERROR, "executing script '%s' pipe() error: %s", script, strerror(errno));
64 log_printf(ERROR, "executing script '%s' fork() error: %s", script, strerror(errno));
70 for (fd=getdtablesize();fd>=0;--fd) // close all file descriptors
71 if(fd != pipefd[1]) close(fd);
73 fd = open("/dev/null",O_RDWR); // stdin
75 log_printf(WARNING, "can't open stdin");
77 if(dup(fd) == -1) // stdout
78 log_printf(WARNING, "can't open stdout");
79 if(dup(fd) == -1) // stderr
80 log_printf(WARNING, "can't open stderr");
82 execve(script, argv, evp);
83 // if execve returns, an error occurred, but logging doesn't work
84 // because we closed all file descriptors, so just write errno to
86 write(pipefd[1], (void*)(&errno), sizeof(errno));
92 waitpid(pid, &status, 0);
96 FD_SET(pipefd[0], &rfds);
97 struct timeval tv = { 0 , 0 };
98 if(select(pipefd[0]+1, &rfds, NULL, NULL, &tv) == 1) {
100 if(read(pipefd[0], (void*)(&err), sizeof(err)) >= sizeof(err)) {
101 log_printf(NOTICE, "script '%s' exec() error: %s", script, strerror(err));
106 if(WIFEXITED(status))
107 log_printf(NOTICE, "script '%s' returned %d", script, WEXITSTATUS(status));
108 else if(WIFSIGNALED(status))
109 log_printf(NOTICE, "script '%s' terminated after signal %d", script, WTERMSIG(status));
111 log_printf(ERROR, "executing script '%s': unkown error", script);