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shadowsocks-libev
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shadowsocks-libev/src/redir.c

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/*
* redir.c - Provide a transparent TCP proxy through remote shadowsocks
* server
*
* Copyright (C) 2013 - 2016, Max Lv <max.c.lv@gmail.com>
*
* This file is part of the shadowsocks-libev.
*
* shadowsocks-libev 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
* (at your option) any later version.
*
* shadowsocks-libev 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 shadowsocks-libev; see the file COPYING. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include <sys/stat.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <locale.h>
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <pthread.h>
#include <signal.h>
#include <string.h>
#include <strings.h>
#include <time.h>
#include <unistd.h>
#include <getopt.h>
#include <limits.h>
#include <linux/if.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
#include <udns.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "netutils.h"
#include "utils.h"
#include "common.h"
#include "redir.h"
#ifndef EAGAIN
#define EAGAIN EWOULDBLOCK
#endif
#ifndef EWOULDBLOCK
#define EWOULDBLOCK EAGAIN
#endif
#ifndef BUF_SIZE
#define BUF_SIZE 2048
#endif
#ifndef IP6T_SO_ORIGINAL_DST
#define IP6T_SO_ORIGINAL_DST 80
#endif
static void accept_cb(EV_P_ ev_io *w, int revents);
static void server_recv_cb(EV_P_ ev_io *w, int revents);
static void server_send_cb(EV_P_ ev_io *w, int revents);
static void remote_recv_cb(EV_P_ ev_io *w, int revents);
static void remote_send_cb(EV_P_ ev_io *w, int revents);
static remote_t *new_remote(int fd, int timeout);
static server_t *new_server(int fd, int method);
static void free_remote(remote_t *remote);
static void close_and_free_remote(EV_P_ remote_t *remote);
static void free_server(server_t *server);
static void close_and_free_server(EV_P_ server_t *server);
int verbose = 0;
static int mode = TCP_ONLY;
static int auth = 0;
#ifdef HAVE_SETRLIMIT
static int nofile = 0;
#endif
int getdestaddr(int fd, struct sockaddr_storage *destaddr)
{
socklen_t socklen = sizeof(*destaddr);
int error = 0;
error = getsockopt(fd, SOL_IPV6, IP6T_SO_ORIGINAL_DST, destaddr, &socklen);
if (error) { // Didn't find a proper way to detect IP version.
error = getsockopt(fd, SOL_IP, SO_ORIGINAL_DST, destaddr, &socklen);
if (error) {
return -1;
}
}
return 0;
}
int setnonblocking(int fd)
{
int flags;
if (-1 == (flags = fcntl(fd, F_GETFL, 0))) {
flags = 0;
}
return fcntl(fd, F_SETFL, flags | O_NONBLOCK);
}
int create_and_bind(const char *addr, const char *port)
{
struct addrinfo hints;
struct addrinfo *result, *rp;
int s, listen_sock;
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = AF_UNSPEC; /* Return IPv4 and IPv6 choices */
hints.ai_socktype = SOCK_STREAM; /* We want a TCP socket */
s = getaddrinfo(addr, port, &hints, &result);
if (s != 0) {
LOGI("getaddrinfo: %s", gai_strerror(s));
return -1;
}
for (rp = result; rp != NULL; rp = rp->ai_next) {
listen_sock = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
if (listen_sock == -1) {
continue;
}
int opt = 1;
setsockopt(listen_sock, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
#ifdef SO_NOSIGPIPE
setsockopt(listen_sock, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof(opt));
#endif
int err = set_reuseport(listen_sock);
if (err == 0) {
LOGI("tcp port reuse enabled");
}
s = bind(listen_sock, rp->ai_addr, rp->ai_addrlen);
if (s == 0) {
/* We managed to bind successfully! */
break;
} else {
ERROR("bind");
}
close(listen_sock);
}
if (rp == NULL) {
LOGE("Could not bind");
return -1;
}
freeaddrinfo(result);
return listen_sock;
}
static void server_recv_cb(EV_P_ ev_io *w, int revents)
{
server_ctx_t *server_recv_ctx = (server_ctx_t *)w;
server_t *server = server_recv_ctx->server;
remote_t *remote = server->remote;
ssize_t r = recv(server->fd, remote->buf->array, BUF_SIZE, 0);
if (r == 0) {
// connection closed
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;
} else if (r < 0) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
// no data
// continue to wait for recv
return;
} else {
ERROR("server recv");
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;
}
}
if (verbose) {
uint16_t port = 0;
char ipstr[INET6_ADDRSTRLEN];
memset(&ipstr, 0, INET6_ADDRSTRLEN);
if (AF_INET == server->destaddr.ss_family) {
struct sockaddr_in *sa = (struct sockaddr_in *)&(server->destaddr);
dns_ntop(AF_INET, &(sa->sin_addr), ipstr, INET_ADDRSTRLEN);
port = ntohs(sa->sin_port);
} else {
// TODO: The code below need to be test in IPv6 envirment, which I
// don't have.
struct sockaddr_in6 *sa = (struct sockaddr_in6 *)&(server->destaddr);
dns_ntop(AF_INET6, &(sa->sin6_addr), ipstr, INET6_ADDRSTRLEN);
port = ntohs(sa->sin6_port);
}
LOGI("redir to %s:%d, len=%zd", ipstr, port, r);
}
remote->buf->len = r;
if (auth) {
ss_gen_hash(remote->buf, &remote->counter, server->e_ctx, BUF_SIZE);
}
if (!remote->send_ctx->connected) {
ev_io_stop(EV_A_ & server_recv_ctx->io);
ev_io_start(EV_A_ & remote->send_ctx->io);
return;
}
int err = ss_encrypt(remote->buf, server->e_ctx, BUF_SIZE);
if (err) {
LOGE("invalid password or cipher");
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;
}
int s = send(remote->fd, remote->buf->array, remote->buf->len, 0);
if (s == -1) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
// no data, wait for send
remote->buf->idx = 0;
ev_io_stop(EV_A_ & server_recv_ctx->io);
ev_io_start(EV_A_ & remote->send_ctx->io);
return;
} else {
ERROR("send");
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;
}
} else if (s < remote->buf->len) {
remote->buf->len -= s;
remote->buf->idx = s;
ev_io_stop(EV_A_ & server_recv_ctx->io);
ev_io_start(EV_A_ & remote->send_ctx->io);
return;
}
}
static void server_send_cb(EV_P_ ev_io *w, int revents)
{
server_ctx_t *server_send_ctx = (server_ctx_t *)w;
server_t *server = server_send_ctx->server;
remote_t *remote = server->remote;
if (server->buf->len == 0) {
// close and free
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;
} else {
// has data to send
ssize_t s = send(server->fd, server->buf->array + server->buf->idx,
server->buf->len, 0);
if (s < 0) {
if (errno != EAGAIN && errno != EWOULDBLOCK) {
ERROR("send");
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
}
return;
} else if (s < server->buf->len) {
// partly sent, move memory, wait for the next time to send
server->buf->len -= s;
server->buf->idx += s;
return;
} else {
// all sent out, wait for reading
server->buf->len = 0;
server->buf->idx = 0;
ev_io_stop(EV_A_ & server_send_ctx->io);
ev_io_start(EV_A_ & remote->recv_ctx->io);
}
}
}
static void remote_timeout_cb(EV_P_ ev_timer *watcher, int revents)
{
remote_ctx_t *remote_ctx = (remote_ctx_t *)(((void *)watcher)
- sizeof(ev_io));
remote_t *remote = remote_ctx->remote;
server_t *server = remote->server;
ev_timer_stop(EV_A_ watcher);
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
}
static void remote_recv_cb(EV_P_ ev_io *w, int revents)
{
remote_ctx_t *remote_recv_ctx = (remote_ctx_t *)w;
remote_t *remote = remote_recv_ctx->remote;
server_t *server = remote->server;
ssize_t r = recv(remote->fd, server->buf->array, BUF_SIZE, 0);
if (r == 0) {
// connection closed
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;
} else if (r < 0) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
// no data
// continue to wait for recv
return;
} else {
ERROR("remote recv");
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;
}
}
server->buf->len = r;
int err = ss_decrypt(server->buf, server->d_ctx, BUF_SIZE);
if (err) {
LOGE("invalid password or cipher");
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;
}
int s = send(server->fd, server->buf->array, server->buf->len, 0);
if (s == -1) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
// no data, wait for send
server->buf->idx = 0;
ev_io_stop(EV_A_ & remote_recv_ctx->io);
ev_io_start(EV_A_ & server->send_ctx->io);
return;
} else {
ERROR("send");
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;
}
} else if (s < server->buf->len) {
server->buf->len -= s;
server->buf->idx = s;
ev_io_stop(EV_A_ & remote_recv_ctx->io);
ev_io_start(EV_A_ & server->send_ctx->io);
return;
}
}
static void remote_send_cb(EV_P_ ev_io *w, int revents)
{
remote_ctx_t *remote_send_ctx = (remote_ctx_t *)w;
remote_t *remote = remote_send_ctx->remote;
server_t *server = remote->server;
if (!remote_send_ctx->connected) {
struct sockaddr_storage addr;
socklen_t len = sizeof addr;
int r = getpeername(remote->fd, (struct sockaddr *)&addr, &len);
if (r == 0) {
remote_send_ctx->connected = 1;
ev_io_stop(EV_A_ & remote_send_ctx->io);
ev_io_stop(EV_A_ & server->recv_ctx->io);
ev_timer_stop(EV_A_ & remote_send_ctx->watcher);
// send destaddr
buffer_t ss_addr_to_send;
buffer_t *abuf = &ss_addr_to_send;
balloc(abuf, BUF_SIZE);
if (AF_INET6 == server->destaddr.ss_family) { // IPv6
abuf->array[abuf->len++] = 4; // Type 4 is IPv6 address
size_t in6_addr_len = sizeof(struct in6_addr);
memcpy(abuf->array + abuf->len,
&(((struct sockaddr_in6 *)&(server->destaddr))->sin6_addr),
in6_addr_len);
abuf->len += in6_addr_len;
memcpy(abuf->array + abuf->len,
&(((struct sockaddr_in6 *)&(server->destaddr))->sin6_port),
2);
} else { // IPv4
abuf->array[abuf->len++] = 1; // Type 1 is IPv4 address
size_t in_addr_len = sizeof(struct in_addr);
memcpy(abuf->array + abuf->len,
&((struct sockaddr_in *)&(server->destaddr))->sin_addr, in_addr_len);
abuf->len += in_addr_len;
memcpy(abuf->array + abuf->len,
&((struct sockaddr_in *)&(server->destaddr))->sin_port, 2);
}
abuf->len += 2;
if (auth) {
abuf->array[0] |= ONETIMEAUTH_FLAG;
ss_onetimeauth(abuf, server->e_ctx->evp.iv, BUF_SIZE);
}
brealloc(remote->buf, remote->buf->len + abuf->len, BUF_SIZE);
memmove(remote->buf->array + abuf->len, remote->buf->array, remote->buf->len);
memcpy(remote->buf->array, abuf->array, abuf->len);
remote->buf->len += abuf->len;
bfree(abuf);
int err = ss_encrypt(remote->buf, server->e_ctx, BUF_SIZE);
if (err) {
LOGE("invalid password or cipher");
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;
}
ev_io_start(EV_A_ & remote->recv_ctx->io);
} else {
ERROR("getpeername");
// not connected
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;
}
}
if (remote->buf->len == 0) {
// close and free
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;
} else {
// has data to send
ssize_t s = send(remote->fd, remote->buf->array + remote->buf->idx,
remote->buf->len, 0);
if (s < 0) {
if (errno != EAGAIN && errno != EWOULDBLOCK) {
ERROR("send");
// close and free
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
}
return;
} else if (s < remote->buf->len) {
// partly sent, move memory, wait for the next time to send
remote->buf->len -= s;
remote->buf->idx += s;
return;
} else {
// all sent out, wait for reading
remote->buf->len = 0;
remote->buf->idx = 0;
ev_io_stop(EV_A_ & remote_send_ctx->io);
ev_io_start(EV_A_ & server->recv_ctx->io);
}
}
}
static remote_t *new_remote(int fd, int timeout)
{
remote_t *remote;
remote = ss_malloc(sizeof(remote_t));
memset(remote, 0, sizeof(remote_t));
remote->recv_ctx = ss_malloc(sizeof(remote_ctx_t));
remote->send_ctx = ss_malloc(sizeof(remote_ctx_t));
remote->buf = ss_malloc(sizeof(buffer_t));
remote->fd = fd;
remote->recv_ctx->remote = remote;
remote->recv_ctx->connected = 0;
remote->send_ctx->remote = remote;
remote->send_ctx->connected = 0;
ev_io_init(&remote->recv_ctx->io, remote_recv_cb, fd, EV_READ);
ev_io_init(&remote->send_ctx->io, remote_send_cb, fd, EV_WRITE);
ev_timer_init(&remote->send_ctx->watcher, remote_timeout_cb,
min(MAX_CONNECT_TIMEOUT, timeout), 0);
balloc(remote->buf, BUF_SIZE);
return remote;
}
static void free_remote(remote_t *remote)
{
if (remote != NULL) {
if (remote->server != NULL) {
remote->server->remote = NULL;
}
if (remote->buf != NULL) {
bfree(remote->buf);
ss_free(remote->buf);
}
ss_free(remote->recv_ctx);
ss_free(remote->send_ctx);
ss_free(remote);
}
}
static void close_and_free_remote(EV_P_ remote_t *remote)
{
if (remote != NULL) {
ev_timer_stop(EV_A_ & remote->send_ctx->watcher);
ev_io_stop(EV_A_ & remote->send_ctx->io);
ev_io_stop(EV_A_ & remote->recv_ctx->io);
close(remote->fd);
free_remote(remote);
}
}
static server_t *new_server(int fd, int method)
{
server_t *server;
server = ss_malloc(sizeof(server_t));
server->recv_ctx = ss_malloc(sizeof(server_ctx_t));
server->send_ctx = ss_malloc(sizeof(server_ctx_t));
server->buf = ss_malloc(sizeof(buffer_t));
server->fd = fd;
server->recv_ctx->server = server;
server->recv_ctx->connected = 0;
server->send_ctx->server = server;
server->send_ctx->connected = 0;
if (method) {
server->e_ctx = ss_malloc(sizeof(enc_ctx_t));
server->d_ctx = ss_malloc(sizeof(enc_ctx_t));
enc_ctx_init(method, server->e_ctx, 1);
enc_ctx_init(method, server->d_ctx, 0);
} else {
server->e_ctx = NULL;
server->d_ctx = NULL;
}
ev_io_init(&server->recv_ctx->io, server_recv_cb, fd, EV_READ);
ev_io_init(&server->send_ctx->io, server_send_cb, fd, EV_WRITE);
balloc(server->buf, BUF_SIZE);
return server;
}
static void free_server(server_t *server)
{
if (server != NULL) {
if (server->remote != NULL) {
server->remote->server = NULL;
}
if (server->e_ctx != NULL) {
cipher_context_release(&server->e_ctx->evp);
ss_free(server->e_ctx);
}
if (server->d_ctx != NULL) {
cipher_context_release(&server->d_ctx->evp);
ss_free(server->d_ctx);
}
if (server->buf != NULL) {
bfree(server->buf);
ss_free(server->buf);
}
ss_free(server->recv_ctx);
ss_free(server->send_ctx);
ss_free(server);
}
}
static void close_and_free_server(EV_P_ server_t *server)
{
if (server != NULL) {
ev_io_stop(EV_A_ & server->send_ctx->io);
ev_io_stop(EV_A_ & server->recv_ctx->io);
close(server->fd);
free_server(server);
}
}
static void accept_cb(EV_P_ ev_io *w, int revents)
{
listen_ctx_t *listener = (listen_ctx_t *)w;
struct sockaddr_storage destaddr;
int err;
int serverfd = accept(listener->fd, NULL, NULL);
if (serverfd == -1) {
ERROR("accept");
return;
}
err = getdestaddr(serverfd, &destaddr);
if (err) {
ERROR("getdestaddr");
return;
}
setnonblocking(serverfd);
int opt = 1;
setsockopt(serverfd, SOL_TCP, TCP_NODELAY, &opt, sizeof(opt));
#ifdef SO_NOSIGPIPE
setsockopt(serverfd, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof(opt));
#endif
int index = rand() % listener->remote_num;
struct sockaddr *remote_addr = listener->remote_addr[index];
int remotefd = socket(remote_addr->sa_family, SOCK_STREAM, IPPROTO_TCP);
if (remotefd < 0) {
ERROR("socket");
return;
}
setsockopt(remotefd, SOL_TCP, TCP_NODELAY, &opt, sizeof(opt));
#ifdef SO_NOSIGPIPE
setsockopt(remotefd, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof(opt));
#endif
// Enable TCP keepalive feature
int keepAlive = 1;
int keepIdle = 40;
int keepInterval = 20;
int keepCount = 5;
setsockopt(remotefd, SOL_SOCKET, SO_KEEPALIVE, (void *)&keepAlive, sizeof(keepAlive));
setsockopt(remotefd, SOL_TCP, TCP_KEEPIDLE, (void *)&keepIdle, sizeof(keepIdle));
setsockopt(remotefd, SOL_TCP, TCP_KEEPINTVL, (void *)&keepInterval, sizeof(keepInterval));
setsockopt(remotefd, SOL_TCP, TCP_KEEPCNT, (void *)&keepCount, sizeof(keepCount));
// Setup
setnonblocking(remotefd);
server_t *server = new_server(serverfd, listener->method);
remote_t *remote = new_remote(remotefd, listener->timeout);
server->remote = remote;
remote->server = server;
server->destaddr = destaddr;
int r = connect(remotefd, remote_addr, get_sockaddr_len(remote_addr));
if (r < 0 && errno != CONNECT_IN_PROGRESS) {
ERROR("connect");
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;
}
if (r == 0) {
if (verbose) LOGI("connected immediately");
remote_send_cb(EV_A_ & remote->send_ctx->io, 0);
} else {
// listen to remote connected event
ev_io_start(EV_A_ & remote->send_ctx->io);
ev_timer_start(EV_A_ & remote->send_ctx->watcher);
}
ev_io_start(EV_A_ & server->recv_ctx->io);
}
int main(int argc, char **argv)
{
int i, c;
int pid_flags = 0;
char *user = NULL;
char *local_port = NULL;
char *local_addr = NULL;
char *password = NULL;
char *timeout = NULL;
char *method = NULL;
char *pid_path = NULL;
char *conf_path = NULL;
int remote_num = 0;
ss_addr_t remote_addr[MAX_REMOTE_NUM];
char *remote_port = NULL;
int option_index = 0;
static struct option long_options[] = {
{ "help", no_argument, 0, 0 },
{ 0, 0, 0, 0 }
};
opterr = 0;
while ((c = getopt_long(argc, argv, "f:s:p:l:k:t:m:c:b:a:n:huUvA",
long_options, &option_index)) != -1) {
switch (c) {
case 0:
if (option_index == 0) {
usage();
exit(EXIT_SUCCESS);
}
break;
case 's':
if (remote_num < MAX_REMOTE_NUM) {
remote_addr[remote_num].host = optarg;
remote_addr[remote_num++].port = NULL;
}
break;
case 'p':
remote_port = optarg;
break;
case 'l':
local_port = optarg;
break;
case 'k':
password = optarg;
break;
case 'f':
pid_flags = 1;
pid_path = optarg;
break;
case 't':
timeout = optarg;
break;
case 'm':
method = optarg;
break;
case 'c':
conf_path = optarg;
break;
case 'b':
local_addr = optarg;
break;
case 'a':
user = optarg;
break;
#ifdef HAVE_SETRLIMIT
case 'n':
nofile = atoi(optarg);
break;
#endif
case 'u':
mode = TCP_AND_UDP;
break;
case 'U':
mode = UDP_ONLY;
break;
case 'v':
verbose = 1;
break;
case 'h':
usage();
exit(EXIT_SUCCESS);
case 'A':
auth = 1;
break;
case '?':
// The option character is not recognized.
opterr = 1;
break;
}
}
if (opterr) {
usage();
exit(EXIT_FAILURE);
}
if (argc == 1) {
if (conf_path == NULL) {
conf_path = DEFAULT_CONF_PATH;
}
}
if (conf_path != NULL) {
jconf_t *conf = read_jconf(conf_path);
if (remote_num == 0) {
remote_num = conf->remote_num;
for (i = 0; i < remote_num; i++)
remote_addr[i] = conf->remote_addr[i];
}
if (remote_port == NULL) {
remote_port = conf->remote_port;
}
if (local_addr == NULL) {
local_addr = conf->local_addr;
}
if (local_port == NULL) {
local_port = conf->local_port;
}
if (password == NULL) {
password = conf->password;
}
if (method == NULL) {
method = conf->method;
}
if (timeout == NULL) {
timeout = conf->timeout;
}
if (auth == 0) {
auth = conf->auth;
}
#ifdef HAVE_SETRLIMIT
if (nofile == 0) {
nofile = conf->nofile;
}
/*
* no need to check the return value here since we will show
* the user an error message if setrlimit(2) fails
*/
if (nofile > 1024) {
if (verbose) {
LOGI("setting NOFILE to %d", nofile);
}
set_nofile(nofile);
}
#endif
}
if (remote_num == 0 || remote_port == NULL ||
local_port == NULL || password == NULL) {
usage();
exit(EXIT_FAILURE);
}
if (timeout == NULL) {
timeout = "60";
}
if (local_addr == NULL) {
local_addr = "127.0.0.1";
}
if (pid_flags) {
USE_SYSLOG(argv[0]);
daemonize(pid_path);
}
if (auth) {
LOGI("onetime authentication enabled");
}
// ignore SIGPIPE
signal(SIGPIPE, SIG_IGN);
signal(SIGABRT, SIG_IGN);
// Setup keys
LOGI("initializing ciphers... %s", method);
int m = enc_init(password, method);
// Setup proxy context
listen_ctx_t listen_ctx;
listen_ctx.remote_num = remote_num;
listen_ctx.remote_addr = ss_malloc(sizeof(struct sockaddr *) * remote_num);
for (int i = 0; i < remote_num; i++) {
char *host = remote_addr[i].host;
char *port = remote_addr[i].port == NULL ? remote_port :
remote_addr[i].port;
struct sockaddr_storage *storage = ss_malloc(sizeof(struct sockaddr_storage));
memset(storage, 0, sizeof(struct sockaddr_storage));
if (get_sockaddr(host, port, storage, 1) == -1) {
FATAL("failed to resolve the provided hostname");
}
listen_ctx.remote_addr[i] = (struct sockaddr *)storage;
}
listen_ctx.timeout = atoi(timeout);
listen_ctx.method = m;
struct ev_loop *loop = EV_DEFAULT;
if (mode != UDP_ONLY) {
// Setup socket
int listenfd;
listenfd = create_and_bind(local_addr, local_port);
if (listenfd < 0) {
FATAL("bind() error");
}
if (listen(listenfd, SOMAXCONN) == -1) {
FATAL("listen() error");
}
setnonblocking(listenfd);
listen_ctx.fd = listenfd;
ev_io_init(&listen_ctx.io, accept_cb, listenfd, EV_READ);
ev_io_start(loop, &listen_ctx.io);
}
// Setup UDP
if (mode != TCP_ONLY) {
LOGI("UDP relay enabled");
init_udprelay(local_addr, local_port, listen_ctx.remote_addr[0],
get_sockaddr_len(listen_ctx.remote_addr[0]), m, auth, listen_ctx.timeout, NULL);
}
if (mode == UDP_ONLY) {
LOGI("TCP relay disabled");
}
LOGI("listening at %s:%s", local_addr, local_port);
// setuid
if (user != NULL) {
run_as(user);
}
ev_run(loop, 0);
return 0;
}