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/*
* uAnytun
*
* uAnytun is a tiny implementation of SATP. Unlike Anytun which is a full
* featured implementation uAnytun has no support for multiple connections
* or synchronisation. It is a small single threaded implementation intended
* to act as a client on small platforms.
* 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 methods 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) 2007-2017 Christian Pointner <equinox@anytun.org>
*
* This file is part of uAnytun.
*
* uAnytun 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.
*
* uAnytun 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 uAnytun. If not, see <http://www.gnu.org/licenses/>.
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
#include "datatypes.h"
#include "log.h"
#include "sig_handler.h"
#include <signal.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
static int sig_pipe_fds[2];
static void sig_handler(int sig)
{
sigset_t set;
int ret = read(sig_pipe_fds[0], &set, sizeof(sigset_t));
if(ret != sizeof(sigset_t))
sigemptyset(&set);
sigaddset(&set, sig);
ret = write(sig_pipe_fds[1], &set, sizeof(sigset_t));
}
int signal_init()
{
if(pipe(sig_pipe_fds)) {
log_printf(ERROR, "signal handling init failed (pipe error: %s)", strerror(errno));
return -1;
}
int i;
for(i=0; i<2; ++i) {
int fd_flags = fcntl(sig_pipe_fds[i], F_GETFL);
if(fd_flags == -1) {
log_printf(ERROR, "signal handling init failed (pipe fd[%d] read flags error: %s)", i, strerror(errno));
return -1;
}
if(fcntl(sig_pipe_fds[i], F_SETFL, fd_flags | O_NONBLOCK) == -1){
log_printf(ERROR, "signal handling init failed (pipe fd[%d] write flags error: %s)", i, strerror(errno));
return -1;
}
}
struct sigaction act, ign;
act.sa_handler = sig_handler;
sigfillset(&act.sa_mask);
act.sa_flags = 0;
ign.sa_handler = SIG_IGN;
sigfillset(&ign.sa_mask);
ign.sa_flags = 0;
if((sigaction(SIGINT, &act, NULL) < 0) ||
(sigaction(SIGQUIT, &act, NULL) < 0) ||
(sigaction(SIGTERM, &act, NULL) < 0) ||
(sigaction(SIGHUP, &act, NULL) < 0) ||
(sigaction(SIGUSR1, &act, NULL) < 0) ||
(sigaction(SIGUSR2, &act, NULL) < 0) ||
(sigaction(SIGCHLD, &ign, NULL) < 0) ||
(sigaction(SIGPIPE, &ign, NULL) < 0)) {
log_printf(ERROR, "signal handling init failed (sigaction error: %s)", strerror(errno));
close(sig_pipe_fds[0]);
close(sig_pipe_fds[1]);
}
return sig_pipe_fds[0];
}
int signal_handle()
{
sigset_t set, oldset, tmpset;
sigemptyset(&tmpset);
sigaddset(&tmpset, SIGINT);
sigaddset(&tmpset, SIGQUIT);
sigaddset(&tmpset, SIGTERM);
sigaddset(&tmpset, SIGHUP);
sigaddset(&tmpset, SIGUSR1);
sigaddset(&tmpset, SIGUSR2);
sigprocmask(SIG_BLOCK, &tmpset, &oldset);
int ret = read(sig_pipe_fds[0], &set, sizeof(sigset_t));
if(ret != sizeof(sigset_t))
sigemptyset(&set);
int return_value = 0;
int sig;
for(sig=1; sig < NSIG; ++sig) {
if(sigismember(&set, sig)) {
switch(sig) {
case SIGINT: log_printf(NOTICE, "SIG-Int caught, exitting"); return_value = SIGINT; break;
case SIGQUIT: log_printf(NOTICE, "SIG-Quit caught, exitting"); return_value = SIGQUIT; break;
case SIGTERM: log_printf(NOTICE, "SIG-Term caught, exitting"); return_value = SIGTERM; break;
case SIGHUP: log_printf(NOTICE, "SIG-Hup caught"); return_value = SIGHUP; break;
case SIGUSR1: log_printf(NOTICE, "SIG-Usr1 caught"); break;
case SIGUSR2: log_printf(NOTICE, "SIG-Usr2 caught"); break;
default: log_printf(WARNING, "unknown signal %d caught, ignoring", sig); break;
}
sigdelset(&set, sig);
}
}
sigprocmask(SIG_SETMASK, &oldset, NULL);
return return_value;
}
void signal_stop()
{
struct sigaction act;
act.sa_handler = SIG_DFL;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
sigaction(SIGINT, &act, NULL);
sigaction(SIGQUIT, &act, NULL);
sigaction(SIGTERM, &act, NULL);
sigaction(SIGHUP, &act, NULL);
sigaction(SIGUSR1, &act, NULL);
sigaction(SIGUSR2, &act, NULL);
sigaction(SIGPIPE, &act, NULL);
sigaction(SIGCHLD, &act, NULL);
close(sig_pipe_fds[0]);
close(sig_pipe_fds[1]);
}
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