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/*
* tcpproxy
*
* tcpproxy is a simple tcp connection proxy which combines the
* features of rinetd and 6tunnel. tcpproxy supports IPv4 and
* IPv6 and also supports connections from IPv6 to IPv4
* endpoints and vice versa.
*
*
* Copyright (C) 2010-2011 Christian Pointner <equinox@spreadspace.org>
*
* This file is part of tcpproxy.
*
* tcpproxy 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.
*
* tcpproxy 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 tcpproxy. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <sys/select.h>
#include "datatypes.h"
#include "options.h"
#include "string_list.h"
#include "log.h"
#include "daemon.h"
#include "listener.h"
#include "clients.h"
#include "cfg_parser.h"
int main_loop(options_t* opt, listeners_t* listeners)
{
log_printf(INFO, "entering main loop");
int sig_fd = signal_init();
if(sig_fd < 0)
return -1;
clients_t clients;
int return_value = clients_init(&clients, opt->buffer_size_);
while(!return_value) {
fd_set readfds, writefds;
FD_ZERO(&readfds);
FD_ZERO(&writefds);
FD_SET(sig_fd, &readfds);
int nfds = sig_fd;
listeners_read_fds(listeners, &readfds, &nfds);
clients_read_fds(&clients, &readfds, &nfds);
clients_write_fds(&clients, &writefds, &nfds);
int ret = select(nfds + 1, &readfds, &writefds, NULL, NULL);
if(ret == -1 && errno != EINTR) {
log_printf(ERROR, "select returned with error: %s", strerror(errno));
return_value = -1;
break;
}
if(!ret || ret == -1)
continue;
if(FD_ISSET(sig_fd, &readfds)) {
return_value = signal_handle();
if(return_value == 1) break;
if(return_value == 2) {
if(opt->config_file_) {
log_printf(NOTICE, "re-reading config file: %s", opt->config_file_);
read_configfile(opt->config_file_, listeners);
} else
log_printf(NOTICE, "ignoring SIGHUP: no config file specified");
return_value = 0;
} else if(return_value == 3) {
listeners_print(listeners);
} else if(return_value == 4) {
clients_print(&clients);
}
}
return_value = listeners_handle_accept(listeners, &clients, &readfds);
if(return_value) break;
return_value = clients_write(&clients, &writefds);
if(return_value) break;
return_value = clients_read(&clients, &readfds);
}
clients_clear(&clients);
signal_stop();
return return_value;
}
int main(int argc, char* argv[])
{
log_init();
options_t opt;
int ret = options_parse(&opt, argc, argv);
if(ret) {
if(ret > 0) {
fprintf(stderr, "syntax error near: %s\n\n", argv[ret]);
}
if(ret == -2) {
fprintf(stderr, "memory error on options_parse, exitting\n");
}
if(ret == -3) {
options_print_version();
}
if(ret != -2 && ret != -3)
options_print_usage();
if(ret == -1 || ret == -3)
ret = 0;
options_clear(&opt);
log_close();
exit(ret);
}
slist_element_t* tmp = opt.log_targets_.first_;
while(tmp) {
ret = log_add_target(tmp->data_);
if(ret) {
switch(ret) {
case -2: fprintf(stderr, "memory error on log_add_target, exitting\n"); break;
case -3: fprintf(stderr, "unknown log target: '%s', exitting\n", (char*)(tmp->data_)); break;
case -4: fprintf(stderr, "this log target is only allowed once: '%s', exitting\n", (char*)(tmp->data_)); break;
default: fprintf(stderr, "syntax error near: '%s', exitting\n", (char*)(tmp->data_)); break;
}
options_clear(&opt);
log_close();
exit(ret);
}
tmp = tmp->next_;
}
log_printf(NOTICE, "just started...");
options_parse_post(&opt);
listeners_t listeners;
ret = listeners_init(&listeners);
if(ret) {
options_clear(&opt);
log_close();
exit(-1);
}
if(opt.local_port_) {
ret = listeners_add(&listeners, opt.local_addr_, opt.lresolv_type_, opt.local_port_, opt.remote_addr_, opt.rresolv_type_, opt.remote_port_, opt.source_addr_);
if(!ret) ret = listeners_update(&listeners);
if(ret) {
listeners_clear(&listeners);
options_clear(&opt);
log_close();
exit(-1);
}
} else {
ret = read_configfile(opt.config_file_, &listeners);
if(ret || !slist_length(&listeners)) {
if(!ret)
log_printf(ERROR, "no listeners defined in config file %s", opt.config_file_);
listeners_clear(&listeners);
options_clear(&opt);
log_close();
exit(-1);
}
}
priv_info_t priv;
if(opt.username_)
if(priv_init(&priv, opt.username_, opt.groupname_)) {
listeners_clear(&listeners);
options_clear(&opt);
log_close();
exit(-1);
}
FILE* pid_file = NULL;
if(opt.pid_file_) {
pid_file = fopen(opt.pid_file_, "w");
if(!pid_file) {
log_printf(WARNING, "unable to open pid file: %s", strerror(errno));
}
}
if(opt.chroot_dir_)
if(do_chroot(opt.chroot_dir_)) {
listeners_clear(&listeners);
options_clear(&opt);
log_close();
exit(-1);
}
if(opt.username_)
if(priv_drop(&priv)) {
listeners_clear(&listeners);
options_clear(&opt);
log_close();
exit(-1);
}
if(opt.daemonize_) {
pid_t oldpid = getpid();
daemonize();
log_printf(INFO, "running in background now (old pid: %d)", oldpid);
}
if(pid_file) {
pid_t pid = getpid();
fprintf(pid_file, "%d", pid);
fclose(pid_file);
}
ret = main_loop(&opt, &listeners);
listeners_clear(&listeners);
options_clear(&opt);
if(!ret)
log_printf(NOTICE, "normal shutdown");
else if(ret < 0)
log_printf(NOTICE, "shutdown after error");
else
log_printf(NOTICE, "shutdown after signal");
log_close();
return ret;
}
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