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shadowsocks-libev/src/tunnel.c
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/*
* tunnel.c - Setup a local port forwarding through remote shadowsocks server
*
* Copyright (C) 2013 - 2019, 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 <fcntl.h>
#include <locale.h>
#include <signal.h>
#include <ctype.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include <getopt.h>
#ifndef __MINGW32__
#include <errno.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <netinet/in.h>
#include <pthread.h>
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#if defined(HAVE_SYS_IOCTL_H) && defined(HAVE_NET_IF_H) && defined(__linux__)
#include <net/if.h>
#include <sys/ioctl.h>
#define SET_INTERFACE
#endif
#include "core.h"
#include "netutils.h"
#include "utils.h"
#include "plugin.h"
#include "tunnel.h"
#include "ss_windows.h"
#ifndef EAGAIN
#define EAGAIN EWOULDBLOCK
#endif
#ifndef EWOULDBLOCK
#define EWOULDBLOCK EAGAIN
#endif
static void accept_cb(SS_P_ ss_io *w, int revents);
static void server_recv_cb(SS_P_ ss_io *w, int revents);
static void server_send_cb(SS_P_ ss_io *w, int revents);
static void remote_recv_cb(SS_P_ ss_io *w, int revents);
static void remote_send_cb(SS_P_ ss_io *w, int revents);
static remote_t *new_remote(int fd, int timeout);
static server_t *new_server(int fd);
static void free_remote(remote_t *remote);
static void close_and_free_remote(SS_P_ remote_t *remote);
static void free_server(server_t *server);
static void close_and_free_server(SS_P_ server_t *server);
static int
validate_tunnel_addr(const ss_addr_t *addr)
{
struct ss_ip ip;
uint16_t port;
if (addr->host == NULL || addr->port == NULL) {
return -1;
}
if (ss_parse_uint16_port(addr->port, &port) == -1) {
return -1;
}
if (ss_ip_init(&ip, addr->host) == -1) {
size_t host_len = strlen(addr->host);
if (!validate_hostname(addr->host, host_len)) {
return -1;
}
}
return 0;
}
#ifdef __ANDROID__
int vpn = 0;
#endif
int verbose = 0;
int reuse_port = 0;
int tcp_incoming_sndbuf = 0;
int tcp_incoming_rcvbuf = 0;
int tcp_outgoing_sndbuf = 0;
int tcp_outgoing_rcvbuf = 0;
static crypto_t *crypto;
static int ipv6first = 0;
static int mode = TCP_ONLY;
#ifdef HAVE_SETRLIMIT
static int nofile = 0;
#endif
static int no_delay = 0;
int fast_open = 0;
static int ret_val = 0;
static struct ss_signal sigint_watcher;
static struct ss_signal sigterm_watcher;
#ifndef __MINGW32__
static struct ss_signal sigchld_watcher;
#else
static struct plugin_watcher_t {
ss_io io;
SOCKET fd;
uint16_t port;
int valid;
} plugin_watcher;
#endif
#ifndef __MINGW32__
static int
setnonblocking(int fd)
{
int flags;
if (-1 == (flags = fcntl(fd, F_GETFL, 0))) {
flags = 0;
}
return fcntl(fd, F_SETFL, flags | O_NONBLOCK);
}
#endif
int
create_and_bind(const char *addr, const char *port)
{
struct addrinfo hints;
struct addrinfo *result, *rp;
int s, listen_sock = -1;
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 */
result = NULL;
s = getaddrinfo(addr, port, &hints, &result);
if (s != 0) {
LOGI("getaddrinfo: %s", gai_strerror(s));
return -1;
}
if (result == NULL) {
LOGE("Could not bind");
return -1;
}
for (rp = result; rp != NULL; rp = rp->ai_next) {
listen_sock = ss_socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
if (listen_sock == -1) {
continue;
}
int opt = 1;
ss_setsockopt(listen_sock, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
#ifdef SO_NOSIGPIPE
ss_setsockopt(listen_sock, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof(opt));
#endif
if (reuse_port) {
int err = set_reuseport(listen_sock);
if (err == 0) {
LOGI("tcp port reuse enabled");
}
}
if (tcp_incoming_sndbuf > 0) {
ss_setsockopt(listen_sock, SOL_SOCKET, SO_SNDBUF, &tcp_incoming_sndbuf, sizeof(int));
}
if (tcp_incoming_rcvbuf > 0) {
ss_setsockopt(listen_sock, SOL_SOCKET, SO_RCVBUF, &tcp_incoming_rcvbuf, sizeof(int));
}
s = bind(listen_sock, rp->ai_addr, rp->ai_addrlen);
if (s == 0) {
/* We managed to bind successfully! */
break;
} else {
ERROR("bind");
}
ss_socket_close(listen_sock);
listen_sock = -1;
}
freeaddrinfo(result);
return listen_sock;
}
static void
server_recv_cb(SS_P_ ss_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;
if (remote == NULL) {
close_and_free_server(SS_A_ server);
return;
}
ssize_t r = recv(server->fd, remote->buf->data, SOCKET_BUF_SIZE, 0);
if (r == 0) {
// connection closed
close_and_free_remote(SS_A_ remote);
close_and_free_server(SS_A_ server);
return;
} else if (r == -1) {
if (ss_socket_error() == EAGAIN || ss_socket_error() == EWOULDBLOCK) {
// no data
// continue to wait for recv
return;
} else {
ERROR("server recv");
close_and_free_remote(SS_A_ remote);
close_and_free_server(SS_A_ server);
return;
}
}
remote->buf->len = r;
int err = crypto->encrypt(remote->buf, server->e_ctx, SOCKET_BUF_SIZE);
if (err) {
LOGE("invalid password or cipher");
close_and_free_remote(SS_A_ remote);
close_and_free_server(SS_A_ server);
return;
}
int s = send(remote->fd, remote->buf->data, remote->buf->len, 0);
if (s == -1) {
if (ss_socket_error() == EAGAIN || ss_socket_error() == EWOULDBLOCK) {
// no data, wait for send
remote->buf->idx = 0;
ss_io_stop(SS_A_ & server_recv_ctx->io);
ss_io_start(SS_A_ & remote->send_ctx->io);
return;
} else {
ERROR("send");
close_and_free_remote(SS_A_ remote);
close_and_free_server(SS_A_ server);
return;
}
} else if (s < remote->buf->len) {
remote->buf->len -= s;
remote->buf->idx = s;
ss_io_stop(SS_A_ & server_recv_ctx->io);
ss_io_start(SS_A_ & remote->send_ctx->io);
return;
}
}
static void
server_send_cb(SS_P_ ss_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(SS_A_ remote);
close_and_free_server(SS_A_ server);
return;
} else {
// has data to send
ssize_t s = send(server->fd, server->buf->data + server->buf->idx,
server->buf->len, 0);
if (s == -1) {
if (ss_socket_error() != EAGAIN && ss_socket_error() != EWOULDBLOCK) {
ERROR("send");
close_and_free_remote(SS_A_ remote);
close_and_free_server(SS_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;
ss_io_stop(SS_A_ & server_send_ctx->io);
if (remote != NULL) {
ss_io_start(SS_A_ & remote->recv_ctx->io);
} else {
close_and_free_remote(SS_A_ remote);
close_and_free_server(SS_A_ server);
return;
}
}
}
}
static void
remote_timeout_cb(SS_P_ ss_timer *watcher, int revents)
{
remote_ctx_t *remote_ctx
= ss_container_of(watcher, remote_ctx_t, watcher);
remote_t *remote = remote_ctx->remote;
server_t *server = remote->server;
if (verbose) {
LOGI("TCP connection timeout");
}
ss_timer_stop(SS_A_ watcher);
close_and_free_remote(SS_A_ remote);
close_and_free_server(SS_A_ server);
}
static void
remote_recv_cb(SS_P_ ss_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->data, SOCKET_BUF_SIZE, 0);
if (r == 0) {
// connection closed
close_and_free_remote(SS_A_ remote);
close_and_free_server(SS_A_ server);
return;
} else if (r == -1) {
if (ss_socket_error() == EAGAIN || ss_socket_error() == EWOULDBLOCK) {
// no data
// continue to wait for recv
return;
} else {
ERROR("remote recv");
close_and_free_remote(SS_A_ remote);
close_and_free_server(SS_A_ server);
return;
}
}
server->buf->len = r;
int err = crypto->decrypt(server->buf, server->d_ctx, SOCKET_BUF_SIZE);
if (err == CRYPTO_ERROR) {
LOGE("invalid password or cipher");
close_and_free_remote(SS_A_ remote);
close_and_free_server(SS_A_ server);
return;
} else if (err == CRYPTO_NEED_MORE) {
return; // Wait for more
}
int s = send(server->fd, server->buf->data, server->buf->len, 0);
if (s == -1) {
if (ss_socket_error() == EAGAIN || ss_socket_error() == EWOULDBLOCK) {
// no data, wait for send
server->buf->idx = 0;
ss_io_stop(SS_A_ & remote_recv_ctx->io);
ss_io_start(SS_A_ & server->send_ctx->io);
} else {
ERROR("send");
close_and_free_remote(SS_A_ remote);
close_and_free_server(SS_A_ server);
return;
}
} else if (s < server->buf->len) {
server->buf->len -= s;
server->buf->idx = s;
ss_io_stop(SS_A_ & remote_recv_ctx->io);
ss_io_start(SS_A_ & server->send_ctx->io);
}
// Disable TCP_NODELAY after the first response are sent
if (!remote->recv_ctx->connected && !no_delay) {
int opt = 0;
ss_setsockopt(server->fd, SOL_TCP, TCP_NODELAY, &opt, sizeof(opt));
ss_setsockopt(remote->fd, SOL_TCP, TCP_NODELAY, &opt, sizeof(opt));
}
remote->recv_ctx->connected = 1;
}
static void
remote_send_cb(SS_P_ ss_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;
ss_timer_stop(SS_A_ & remote_send_ctx->watcher);
if (!remote_send_ctx->connected) {
int r = 0;
if (remote->addr == NULL) {
struct sockaddr_storage addr;
socklen_t len = sizeof(struct sockaddr_storage);
r = getpeername(remote->fd, (struct sockaddr *)&addr, &len);
}
if (r == 0) {
remote_send_ctx->connected = 1;
if (remote->buf->len != 0) {
LOGE("unexpected pending tunnel data");
close_and_free_remote(SS_A_ remote);
close_and_free_server(SS_A_ server);
return;
}
buffer_t *abuf = remote->buf;
ss_addr_t *sa = &server->destaddr;
struct ss_ip ip;
if (ss_ip_init(&ip, sa->host) != -1) {
if (ip.version == 4) {
// send as IPv4
struct in_addr host;
memset(&host, 0, sizeof(struct in_addr));
int host_len = sizeof(struct in_addr);
if (inet_pton(AF_INET, sa->host, &host) == -1) {
FATAL("IP parser error");
}
abuf->data[abuf->len++] = 1;
memcpy(abuf->data + abuf->len, &host, host_len);
abuf->len += host_len;
} else if (ip.version == 6) {
// send as IPv6
struct in6_addr host;
memset(&host, 0, sizeof(struct in6_addr));
int host_len = sizeof(struct in6_addr);
if (inet_pton(AF_INET6, sa->host, &host) == -1) {
FATAL("IP parser error");
}
abuf->data[abuf->len++] = 4;
memcpy(abuf->data + abuf->len, &host, host_len);
abuf->len += host_len;
} else {
FATAL("IP parser error");
}
} else {
// send as domain
int host_len = strlen(sa->host);
if (host_len > UINT8_MAX) {
LOGE("tunnel host name is too long");
close_and_free_remote(SS_A_ remote);
close_and_free_server(SS_A_ server);
return;
}
abuf->data[abuf->len++] = 3;
abuf->data[abuf->len++] = host_len;
memcpy(abuf->data + abuf->len, sa->host, host_len);
abuf->len += host_len;
}
uint16_t port_num;
if (ss_parse_uint16_port(sa->port, &port_num) == -1) {
LOGE("invalid tunnel port");
close_and_free_remote(SS_A_ remote);
close_and_free_server(SS_A_ server);
return;
}
uint16_t port = htons(port_num);
memcpy(abuf->data + abuf->len, &port, 2);
abuf->len += 2;
int err = crypto->encrypt(abuf, server->e_ctx, SOCKET_BUF_SIZE);
if (err) {
LOGE("invalid password or cipher");
close_and_free_remote(SS_A_ remote);
close_and_free_server(SS_A_ server);
return;
}
ss_io_start(SS_A_ & remote->recv_ctx->io);
} else {
ERROR("getpeername");
// not connected
close_and_free_remote(SS_A_ remote);
close_and_free_server(SS_A_ server);
return;
}
}
if (remote->buf->len == 0) {
// close and free
close_and_free_remote(SS_A_ remote);
close_and_free_server(SS_A_ server);
return;
} else {
// has data to send
ssize_t s = -1;
if (remote->addr != NULL) {
#if defined(TCP_FASTOPEN_WINSOCK)
DWORD s = -1;
DWORD err = 0;
do {
int optval = 1;
// Set fast open option
if (ss_setsockopt(remote->fd, IPPROTO_TCP, TCP_FASTOPEN,
&optval, sizeof(optval)) != 0) {
ERROR("setsockopt");
break;
}
// Load ConnectEx function
LPFN_CONNECTEX ConnectEx = winsock_getconnectex();
if (ConnectEx == NULL) {
LOGE("Cannot load ConnectEx() function");
err = WSAENOPROTOOPT;
break;
}
// ConnectEx requires a bound socket
if (winsock_dummybind(remote->fd,
(struct sockaddr *)&(remote->addr)) != 0) {
ERROR("bind");
break;
}
// Call ConnectEx to send data
memset(&remote->olap, 0, sizeof(remote->olap));
remote->connect_ex_done = 0;
if (ConnectEx(remote->fd, (const struct sockaddr *)&(remote->addr),
get_sockaddr_len(remote->addr), remote->buf->data, remote->buf->len,
&s, &remote->olap)) {
remote->connect_ex_done = 1;
break;
}
// XXX: ConnectEx pending, check later in remote_send
if (WSAGetLastError() == ERROR_IO_PENDING) {
err = CONNECT_IN_PROGRESS;
break;
}
ERROR("ConnectEx");
} while (0);
// Set error number
if (err) {
SetLastError(err);
}
#elif defined(CONNECT_DATA_IDEMPOTENT)
((struct sockaddr_in *)&(remote->addr))->sin_len = sizeof(struct sockaddr_in);
sa_endpoints_t endpoints;
memset((char *)&endpoints, 0, sizeof(endpoints));
endpoints.sae_dstaddr = (struct sockaddr *)&(remote->addr);
endpoints.sae_dstaddrlen = get_sockaddr_len(remote->addr);
s = connectx(remote->fd, &endpoints, SAE_ASSOCID_ANY,
CONNECT_RESUME_ON_READ_WRITE | CONNECT_DATA_IDEMPOTENT,
NULL, 0, NULL, NULL);
#elif defined(TCP_FASTOPEN_CONNECT)
int optval = 1;
if (ss_setsockopt(remote->fd, IPPROTO_TCP, TCP_FASTOPEN_CONNECT,
(void *)&optval, sizeof(optval)) < 0)
FATAL("failed to set TCP_FASTOPEN_CONNECT");
s = connect(remote->fd, remote->addr, get_sockaddr_len(remote->addr));
if (s == 0)
s = send(remote->fd, remote->buf->data, remote->buf->len, 0);
#elif defined(MSG_FASTOPEN)
s = sendto(remote->fd, remote->buf->data + remote->buf->idx,
remote->buf->len, MSG_FASTOPEN, remote->addr,
get_sockaddr_len(remote->addr));
#else
FATAL("tcp fast open is not supported on this platform");
#endif
remote->addr = NULL;
if (s == -1) {
if (ss_socket_error() == CONNECT_IN_PROGRESS) {
ss_io_start(SS_A_ & remote_send_ctx->io);
ss_timer_start(SS_A_ & remote_send_ctx->watcher);
} else {
fast_open = 0;
if (ss_socket_error() == EOPNOTSUPP || ss_socket_error() == EPROTONOSUPPORT ||
ss_socket_error() == ENOPROTOOPT) {
LOGE("fast open is not supported on this platform");
} else {
ERROR("fast_open_connect");
}
close_and_free_remote(SS_A_ remote);
close_and_free_server(SS_A_ server);
}
return;
}
} else {
s = send(remote->fd, remote->buf->data + remote->buf->idx,
remote->buf->len, 0);
}
if (s == -1) {
if (ss_socket_error() != EAGAIN && ss_socket_error() != EWOULDBLOCK) {
ERROR("send");
// close and free
close_and_free_remote(SS_A_ remote);
close_and_free_server(SS_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;
ss_io_stop(SS_A_ & remote_send_ctx->io);
ss_io_start(SS_A_ & server->recv_ctx->io);
}
}
}
static remote_t *
new_remote(int fd, int timeout)
{
remote_t *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));
balloc(remote->buf, SOCKET_BUF_SIZE);
memset(remote->recv_ctx, 0, sizeof(remote_ctx_t));
memset(remote->send_ctx, 0, sizeof(remote_ctx_t));
remote->fd = fd;
remote->recv_ctx->remote = remote;
remote->recv_ctx->connected = 0;
remote->send_ctx->remote = remote;
remote->send_ctx->connected = 0;
ss_io_init(&remote->recv_ctx->io, remote_recv_cb, fd, SS_READ);
ss_io_init(&remote->send_ctx->io, remote_send_cb, fd, SS_WRITE);
ss_timer_init(&remote->send_ctx->watcher, remote_timeout_cb,
min(MAX_CONNECT_TIMEOUT, timeout), 0);
return remote;
}
static void
free_remote(remote_t *remote)
{
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(SS_P_ remote_t *remote)
{
if (remote != NULL) {
ss_timer_stop(SS_A_ & remote->send_ctx->watcher);
ss_io_stop(SS_A_ & remote->send_ctx->io);
ss_io_stop(SS_A_ & remote->recv_ctx->io);
ss_socket_close(remote->fd);
free_remote(remote);
}
}
static server_t *
new_server(int fd)
{
server_t *server = ss_malloc(sizeof(server_t));
memset(server, 0, 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));
balloc(server->buf, SOCKET_BUF_SIZE);
memset(server->recv_ctx, 0, sizeof(server_ctx_t));
memset(server->send_ctx, 0, sizeof(server_ctx_t));
server->fd = fd;
server->recv_ctx->server = server;
server->recv_ctx->connected = 0;
server->send_ctx->server = server;
server->send_ctx->connected = 0;
server->e_ctx = ss_malloc(sizeof(cipher_ctx_t));
server->d_ctx = ss_malloc(sizeof(cipher_ctx_t));
crypto->ctx_init(crypto->cipher, server->e_ctx, 1);
crypto->ctx_init(crypto->cipher, server->d_ctx, 0);
cipher_ctx_pair(server->e_ctx, server->d_ctx);
ss_io_init(&server->recv_ctx->io, server_recv_cb, fd, SS_READ);
ss_io_init(&server->send_ctx->io, server_send_cb, fd, SS_WRITE);
return server;
}
static void
free_server(server_t *server)
{
if (server->remote != NULL) {
// NOLINTNEXTLINE(clang-analyzer-unix.Malloc): back-pointers are cleared symmetrically on free
server->remote->server = NULL;
}
if (server->e_ctx != NULL) {
crypto->ctx_release(server->e_ctx);
ss_free(server->e_ctx);
}
if (server->d_ctx != NULL) {
crypto->ctx_release(server->d_ctx);
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(SS_P_ server_t *server)
{
if (server != NULL) {
ss_io_stop(SS_A_ & server->send_ctx->io);
ss_io_stop(SS_A_ & server->recv_ctx->io);
ss_socket_close(server->fd);
free_server(server);
}
}
static void
accept_cb(SS_P_ ss_io *w, int revents)
{
struct listen_ctx *listener = (struct listen_ctx *)w;
int serverfd = ss_accept(listener->fd, NULL, NULL);
if (serverfd == -1) {
ERROR("accept");
return;
}
setnonblocking(serverfd);
int opt = 1;
ss_setsockopt(serverfd, SOL_TCP, TCP_NODELAY, &opt, sizeof(opt));
#ifdef SO_NOSIGPIPE
ss_setsockopt(serverfd, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof(opt));
#endif
int index = (int)randombytes_uniform((uint32_t)listener->remote_num);
struct sockaddr *remote_addr = listener->remote_addr[index];
int protocol = IPPROTO_TCP;
if (listener->mptcp < 0) {
protocol = IPPROTO_MPTCP; // Enable upstream MPTCP
}
int remotefd = ss_socket(remote_addr->sa_family, SOCK_STREAM, protocol);
if (remotefd == -1) {
ERROR("socket");
return;
}
#ifdef __ANDROID__
if (vpn) {
int not_protect = 0;
if (remote_addr->sa_family == AF_INET) {
struct sockaddr_in *s = (struct sockaddr_in *)remote_addr;
if (s->sin_addr.s_addr == inet_addr("127.0.0.1"))
not_protect = 1;
}
if (!not_protect) {
if (protect_socket(remotefd) == -1) {
ERROR("protect_socket");
ss_socket_close(remotefd);
return;
}
}
}
#endif
int keepAlive = 1;
ss_setsockopt(remotefd, SOL_SOCKET, SO_KEEPALIVE, (void *)&keepAlive, sizeof(keepAlive));
ss_setsockopt(remotefd, SOL_TCP, TCP_NODELAY, &opt, sizeof(opt));
#ifdef SO_NOSIGPIPE
ss_setsockopt(remotefd, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof(opt));
#endif
// Enable out-of-tree MPTCP
if (listener->mptcp > 1) {
int err = ss_setsockopt(remotefd, SOL_TCP, listener->mptcp, &opt, sizeof(opt));
if (err == -1) {
ERROR("failed to enable out-of-tree multipath TCP");
}
} else if (listener->mptcp == 1) {
int i = 0;
while ((listener->mptcp = mptcp_enabled_values[i]) > 0) {
int err = ss_setsockopt(remotefd, SOL_TCP, listener->mptcp, &opt, sizeof(opt));
if (err != -1) {
break;
}
i++;
}
if (listener->mptcp == 0) {
ERROR("failed to enable out-of-tree multipath TCP");
}
}
if (tcp_outgoing_sndbuf > 0) {
ss_setsockopt(remotefd, SOL_SOCKET, SO_SNDBUF, &tcp_outgoing_sndbuf, sizeof(int));
}
if (tcp_outgoing_rcvbuf > 0) {
ss_setsockopt(remotefd, SOL_SOCKET, SO_RCVBUF, &tcp_outgoing_rcvbuf, sizeof(int));
}
// Setup
setnonblocking(remotefd);
#ifdef SET_INTERFACE
if (listener->iface) {
if (setinterface(remotefd, listener->iface) == -1)
ERROR("setinterface");
}
#endif
server_t *server = new_server(serverfd);
remote_t *remote = new_remote(remotefd, listener->timeout);
server->destaddr = listener->tunnel_addr;
server->remote = remote;
remote->server = server;
if (fast_open) {
remote->addr = remote_addr;
} else {
int r = connect(remotefd, remote_addr, get_sockaddr_len(remote_addr));
if (r == -1 && ss_socket_error() != CONNECT_IN_PROGRESS) {
ERROR("connect");
close_and_free_remote(SS_A_ remote);
close_and_free_server(SS_A_ server);
return;
}
}
// listen to remote connected event
ss_io_start(SS_A_ & remote->send_ctx->io);
ss_timer_start(SS_A_ & remote->send_ctx->watcher);
}
static void
signal_cb(SS_P_ ss_signal *w, int revents)
{
if (revents & SS_SIGNAL) {
switch (w->signum) {
#ifndef __MINGW32__
case SIGCHLD:
if (!is_plugin_running()) {
LOGE("plugin service exit unexpectedly");
ret_val = -1;
} else
return;
#endif
case SIGINT:
case SIGTERM:
ss_signal_stop(SS_DEFAULT, &sigint_watcher);
ss_signal_stop(SS_DEFAULT, &sigterm_watcher);
#ifndef __MINGW32__
ss_signal_stop(SS_DEFAULT, &sigchld_watcher);
#else
ss_io_stop(SS_DEFAULT, &plugin_watcher.io);
#endif
ss_unloop(SS_A_ SS_UNLOOP_ALL);
}
}
}
#ifdef __MINGW32__
static void
plugin_watcher_cb(SS_P_ ss_io *w, int revents)
{
char buf[1];
SOCKET fd = ss_accept(plugin_watcher.fd, NULL, NULL);
if (fd == INVALID_SOCKET) {
return;
}
recv(fd, buf, 1, 0);
closesocket(fd);
LOGE("plugin service exit unexpectedly");
ret_val = -1;
ss_signal_stop(SS_DEFAULT, &sigint_watcher);
ss_signal_stop(SS_DEFAULT, &sigterm_watcher);
ss_io_stop(SS_DEFAULT, &plugin_watcher.io);
ss_unloop(SS_A_ SS_UNLOOP_ALL);
}
#endif
int
main(int argc, char **argv)
{
int i, c;
int pid_flags = 0;
int mptcp = 0;
int mtu = 0;
int timeout_secs = 0;
char *user = NULL;
char *local_port = NULL;
char *local_addr = NULL;
char *password = NULL;
char *key = NULL;
char *timeout = NULL;
char *method = NULL;
char *pid_path = NULL;
char *conf_path = NULL;
char *iface = NULL;
char *plugin = NULL;
char *plugin_opts = NULL;
char *plugin_host = NULL;
char *plugin_port = NULL;
char tmp_port[8];
ss_addr_t tunnel_addr = { .host = NULL, .port = NULL };
char *tunnel_addr_str = NULL;
int remote_num = 0;
char *remote_port = NULL;
ss_addr_t remote_addr[MAX_REMOTE_NUM];
memset(remote_addr, 0, sizeof(ss_addr_t) * MAX_REMOTE_NUM);
/* [cli_long_config]
\par `--config <config_file>`
Read JSON configuration. See the CLI conventions for precedence and default-value behavior. Short alias: `-c`.
[cli_long_config] */
/* [cli_long_cipher]
\par `--cipher <encrypt_method>`
Select the encryption cipher. See `-m` for supported cipher names and key requirements. Short alias: `-m`.
[cli_long_cipher] */
/* [cli_long_timeout]
\par `--timeout <timeout>`
Same behavior as `-t`; see that option for details. Short alias: `-t`.
[cli_long_timeout] */
/* [cli_long_user]
\par `--user <user_name>`
Same behavior as `-a`; see that option for details. Short alias: `-a`.
[cli_long_user] */
/* [cli_long_pid_file]
\par `--pid-file <pid_file>`
Same behavior as `-f`; see that option for details. Short alias: `-f`.
[cli_long_pid_file] */
/* [cli_long_nofile]
\par `--nofile <number>`
Same behavior as `-n`; see that option for details. Short alias: `-n`.
[cli_long_nofile] */
/* [cli_long_udp]
\par `--udp`
Enable both TCP and UDP relay, overriding the configured mode. Short alias: `-u`.
[cli_long_udp] */
/* [cli_long_udp_only]
\par `--udp-only`
Enable UDP relay only, overriding the configured mode. Short alias: `-U`.
[cli_long_udp_only] */
/* [cli_long_ipv6_first]
\par `--ipv6-first`
Prefer IPv6 DNS results; overrides configuration. This does not restrict connections to IPv6. Short alias: `-6`.
[cli_long_ipv6_first] */
/* [cli_long_verbose]
\par `--verbose`
Same behavior as `-v`; see that option for details. Short alias: `-v`.
[cli_long_verbose] */
/* [cli_long_server]
\par `--server <HOST:PORT>`
Set a remote server endpoint; may be repeated with different ports. Use `HOST:PORT` for a hostname or IPv4, and `[IPv6]:PORT` for IPv6 (including `%scope` when needed). Bare IPv6 is always a host, never split into a port. Host-only values require the legacy `--server-port` fallback or a configured port. An endpoint port takes priority over the fallback regardless of option order. SIP003 plugins require the same port for all endpoints. Short alias: `-s`.
[cli_long_server] */
/* [cli_long_server_port]
\par `--server-port <server_port>`
Legacy fallback port for server values without an embedded port. Prefer `--server HOST:PORT`. Short alias: `-p`.
[cli_long_server_port] */
/* [cli_long_listen_address]
\par `--listen-address <local_address>`
Set the listening address. Server and manager addresses may be repeated. Short alias: `-b`.
[cli_long_listen_address] */
/* [cli_long_listen_port]
\par `--listen-port <local_port>`
Set the listening port. Short alias: `-l`.
[cli_long_listen_port] */
/* [cli_long_interface]
\par `--interface <interface>`
Same behavior as `-i`; see that option for details. Short alias: `-i`.
[cli_long_interface] */
/* [cli_long_destination]
\par `--destination <addr:port>`
Set the forwarding destination as HOST:PORT; use [IPv6]:PORT for an IPv6 literal. Short alias: `-L`.
[cli_long_destination] */
/* [cli_long_vpn]
\par `--vpn`
Same behavior as `-V`; see that option for details. Short alias: `-V`.
[cli_long_vpn] */
/* [cli-options]
\snippet{doc} utils.c cli_short_f
\snippet{doc} utils.c cli_short_s
\snippet{doc} utils.c cli_short_p
\snippet{doc} utils.c cli_short_l
\snippet{doc} utils.c cli_short_k
\snippet{doc} utils.c cli_short_t
\snippet{doc} utils.c cli_short_m
\snippet{doc} utils.c cli_short_i
\snippet{doc} utils.c cli_short_c
\snippet{doc} utils.c cli_short_b
\snippet{doc} utils.c cli_short_L
\snippet{doc} utils.c cli_short_a
\snippet{doc} utils.c cli_short_n
\snippet{doc} utils.c cli_short_h
\snippet{doc} utils.c cli_short_u
\snippet{doc} utils.c cli_short_U
\snippet{doc} utils.c cli_short_v
\snippet{doc} utils.c cli_short_V
\snippet{doc} utils.c cli_short_6
\snippet{doc} utils.c cli_short_A
\snippet{doc} tunnel.c cli_long_config
\snippet{doc} tunnel.c cli_long_cipher
\snippet{doc} tunnel.c cli_long_timeout
\snippet{doc} tunnel.c cli_long_user
\snippet{doc} tunnel.c cli_long_pid_file
\snippet{doc} tunnel.c cli_long_nofile
\snippet{doc} tunnel.c cli_long_udp
\snippet{doc} tunnel.c cli_long_udp_only
\snippet{doc} tunnel.c cli_long_ipv6_first
\snippet{doc} tunnel.c cli_long_verbose
\snippet{doc} tunnel.c cli_long_server
\snippet{doc} tunnel.c cli_long_server_port
\snippet{doc} tunnel.c cli_long_listen_address
\snippet{doc} tunnel.c cli_long_listen_port
\snippet{doc} tunnel.c cli_long_interface
\snippet{doc} tunnel.c cli_long_destination
\snippet{doc} utils.c cli_long_version
\snippet{doc} utils.c cli_long_tcp_only
\snippet{doc} utils.c cli_long_ipv4_first
\snippet{doc} tunnel.c cli_long_vpn
\snippet{doc} utils.c cli_long_fast_open
\snippet{doc} utils.c cli_long_mtu
\snippet{doc} utils.c cli_long_no_delay
\snippet{doc} utils.c cli_long_mptcp
\snippet{doc} utils.c cli_long_plugin
\snippet{doc} utils.c cli_long_plugin_opts
\snippet{doc} utils.c cli_long_reuse_port
\snippet{doc} utils.c cli_long_tcp_incoming_sndbuf
\snippet{doc} utils.c cli_long_tcp_incoming_rcvbuf
\snippet{doc} utils.c cli_long_tcp_outgoing_sndbuf
\snippet{doc} utils.c cli_long_tcp_outgoing_rcvbuf
\snippet{doc} utils.c cli_long_password
\snippet{doc} utils.c cli_long_key
\snippet{doc} utils.c cli_long_help
[cli-options] */
static struct option long_options[] = {
{ "config", required_argument, NULL, 'c' },
{ "cipher", required_argument, NULL, 'm' },
{ "timeout", required_argument, NULL, 't' },
{ "user", required_argument, NULL, 'a' },
{ "pid-file", required_argument, NULL, 'f' },
{ "nofile", required_argument, NULL, 'n' },
{ "udp", no_argument, NULL, 'u' },
{ "udp-only", no_argument, NULL, 'U' },
{ "ipv6-first", no_argument, NULL, '6' },
{ "verbose", no_argument, NULL, 'v' },
{ "server", required_argument, NULL, 's' },
{ "server-port", required_argument, NULL, 'p' },
{ "listen-address", required_argument, NULL, 'b' },
{ "listen-port", required_argument, NULL, 'l' },
{ "interface", required_argument, NULL, 'i' },
{ "destination", required_argument, NULL, 'L' },
{ "version", no_argument, NULL, GETOPT_VAL_VERSION },
{ "tcp-only", no_argument, NULL, GETOPT_VAL_TCP_ONLY },
{ "ipv4-first", no_argument, NULL, GETOPT_VAL_IPV4_FIRST },
#ifdef __ANDROID__
{ "vpn", no_argument, NULL, 'V' },
#endif
{ "fast-open", no_argument, NULL, GETOPT_VAL_FAST_OPEN },
{ "mtu", required_argument, NULL, GETOPT_VAL_MTU },
{ "no-delay", no_argument, NULL, GETOPT_VAL_NODELAY },
{ "mptcp", no_argument, NULL, GETOPT_VAL_MPTCP },
{ "plugin", required_argument, NULL, GETOPT_VAL_PLUGIN },
{ "plugin-opts", required_argument, NULL, GETOPT_VAL_PLUGIN_OPTS },
{ "reuse-port", no_argument, NULL, GETOPT_VAL_REUSE_PORT },
{ "tcp-incoming-sndbuf", required_argument, NULL, GETOPT_VAL_TCP_INCOMING_SNDBUF },
{ "tcp-incoming-rcvbuf", required_argument, NULL, GETOPT_VAL_TCP_INCOMING_RCVBUF },
{ "tcp-outgoing-sndbuf", required_argument, NULL, GETOPT_VAL_TCP_OUTGOING_SNDBUF },
{ "tcp-outgoing-rcvbuf", required_argument, NULL, GETOPT_VAL_TCP_OUTGOING_RCVBUF },
{ "password", required_argument, NULL, GETOPT_VAL_PASSWORD },
{ "key", required_argument, NULL, GETOPT_VAL_KEY },
{ "help", no_argument, NULL, GETOPT_VAL_HELP },
{ NULL, 0, NULL, 0 }
};
int mode_set = 0;
int ipv6first_set = 0;
opterr = 0;
USE_TTY();
#ifdef __ANDROID__
while ((c = getopt_long(argc, argv, ":f:s:p:l:k:t:m:i:c:b:L:a:n:huUvV6A",
long_options, NULL)) != -1) {
#else
while ((c = getopt_long(argc, argv, ":f:s:p:l:k:t:m:i:c:b:L:a:n:huUv6A",
long_options, NULL)) != -1) {
#endif
switch (c) {
case GETOPT_VAL_VERSION:
cli_version();
exit(EXIT_SUCCESS);
case GETOPT_VAL_TCP_ONLY:
mode = TCP_ONLY;
mode_set = 1;
break;
case GETOPT_VAL_IPV4_FIRST:
ipv6first = 0;
ipv6first_set = 1;
break;
case GETOPT_VAL_FAST_OPEN:
fast_open = 1;
break;
case GETOPT_VAL_MTU:
if (ss_parse_int(optarg, 0, INT_MAX, &mtu) == -1) {
cli_error("invalid MTU", c, NULL);
}
LOGI("set MTU to %d", mtu);
break;
case GETOPT_VAL_MPTCP:
mptcp = get_mptcp(1);
if (mptcp)
LOGI("enable multipath TCP (%s)", mptcp > 0 ? "out-of-tree" : "upstream");
break;
case GETOPT_VAL_NODELAY:
no_delay = 1;
LOGI("enable TCP no-delay");
break;
case GETOPT_VAL_PLUGIN:
plugin = optarg;
break;
case GETOPT_VAL_PLUGIN_OPTS:
plugin_opts = optarg;
break;
case GETOPT_VAL_KEY:
key = optarg;
break;
case GETOPT_VAL_REUSE_PORT:
reuse_port = 1;
break;
case GETOPT_VAL_TCP_INCOMING_SNDBUF:
if (ss_parse_int(optarg, 0, INT_MAX, &tcp_incoming_sndbuf) == -1) {
cli_error("invalid TCP incoming send buffer size", c, NULL);
}
break;
case GETOPT_VAL_TCP_INCOMING_RCVBUF:
if (ss_parse_int(optarg, 0, INT_MAX, &tcp_incoming_rcvbuf) == -1) {
cli_error("invalid TCP incoming receive buffer size", c, NULL);
}
break;
case GETOPT_VAL_TCP_OUTGOING_SNDBUF:
if (ss_parse_int(optarg, 0, INT_MAX, &tcp_outgoing_sndbuf) == -1) {
cli_error("invalid TCP outgoing send buffer size", c, NULL);
}
break;
case GETOPT_VAL_TCP_OUTGOING_RCVBUF:
if (ss_parse_int(optarg, 0, INT_MAX, &tcp_outgoing_rcvbuf) == -1) {
cli_error("invalid TCP outgoing receive buffer size", c, NULL);
}
break;
case 's':
if (remote_num < MAX_REMOTE_NUM) {
if (parse_server_endpoint(optarg, &remote_addr[remote_num]) != 0)
cli_error("invalid server endpoint; use HOST:PORT or [IPv6]:PORT", 's', NULL);
remote_num++;
} else {
cli_error("too many server endpoints", 's', NULL);
}
break;
case 'p':
{
uint16_t checked_port;
if (ss_parse_uint16_port(optarg, &checked_port) != 0)
cli_error("port must be an integer from 1 to 65535", c, NULL);
}
remote_port = optarg;
break;
case 'l':
{
uint16_t checked_port;
if (ss_parse_uint16_port(optarg, &checked_port) != 0)
cli_error("port must be an integer from 1 to 65535", c, NULL);
}
local_port = optarg;
break;
case GETOPT_VAL_PASSWORD:
case 'k':
password = optarg;
break;
case 'f':
pid_flags = 1;
pid_path = optarg;
break;
case 't':
{
int checked_timeout;
if (ss_parse_int(optarg, 1, INT_MAX, &checked_timeout) != 0)
cli_error("timeout must be a positive integer", c, NULL);
}
timeout = optarg;
break;
case 'm':
method = optarg;
break;
case 'c':
conf_path = optarg;
break;
case 'i':
iface = optarg;
break;
case 'b':
local_addr = optarg;
break;
case 'u':
mode_set = 1;
mode = TCP_AND_UDP;
break;
case 'U':
mode_set = 1;
mode = UDP_ONLY;
break;
case 'L':
tunnel_addr_str = optarg;
break;
case 'a':
user = optarg;
break;
#ifdef HAVE_SETRLIMIT
case 'n':
if (ss_parse_int(optarg, 0, INT_MAX, &nofile) == -1) {
cli_error("invalid nofile", c, NULL);
}
break;
#endif
case 'v':
verbose = 1;
break;
case GETOPT_VAL_HELP:
case 'h':
usage();
exit(EXIT_SUCCESS);
case '6':
ipv6first_set = 1;
ipv6first = 1;
break;
#ifdef __ANDROID__
case 'V':
vpn = 1;
break;
#endif
case 'A':
cli_error("one-time authentication was removed; use an AEAD cipher", 'A', NULL);
break;
case ':':
cli_error("missing required argument for option", optopt, argv[optind - 1]);
break;
case '?':
cli_error("unrecognized or invalid option", optopt, argv[optind - 1]);
break;
default:
cli_error("option is unsupported on this platform", c, NULL);
break;
}
}
if (optind < argc) {
cli_error("unexpected positional argument", 0, NULL);
}
if (argc == 1) {
if (conf_path == NULL) {
conf_path = get_default_conf();
}
}
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 (key == NULL) {
key = conf->key;
}
if (method == NULL) {
method = conf->method;
}
if (timeout == NULL) {
timeout = conf->timeout;
}
if (user == NULL) {
user = conf->user;
}
if (plugin == NULL) {
plugin = conf->plugin;
}
if (plugin_opts == NULL) {
plugin_opts = conf->plugin_opts;
}
if (tunnel_addr_str == NULL) {
tunnel_addr_str = conf->tunnel_address;
}
if (!ipv6first_set) {
ipv6first = conf->ipv6_first;
}
if (!mode_set) {
mode = conf->mode;
}
if (mtu == 0) {
mtu = conf->mtu;
}
if (mptcp == 0) {
mptcp = conf->mptcp;
}
if (no_delay == 0) {
no_delay = conf->no_delay;
}
if (reuse_port == 0) {
reuse_port = conf->reuse_port;
}
if (tcp_incoming_sndbuf == 0) {
tcp_incoming_sndbuf = conf->tcp_incoming_sndbuf;
}
if (tcp_incoming_rcvbuf == 0) {
tcp_incoming_rcvbuf = conf->tcp_incoming_rcvbuf;
}
if (tcp_outgoing_sndbuf == 0) {
tcp_outgoing_sndbuf = conf->tcp_outgoing_sndbuf;
}
if (tcp_outgoing_rcvbuf == 0) {
tcp_outgoing_rcvbuf = conf->tcp_outgoing_rcvbuf;
}
if (fast_open == 0) {
fast_open = conf->fast_open;
}
#ifdef HAVE_SETRLIMIT
if (nofile == 0) {
nofile = conf->nofile;
}
#endif
}
if (complete_server_ports(remote_addr, remote_num, remote_port, plugin != NULL) != 0)
cli_error("each server needs a port (1 to 65535); plugins require a shared port", 's', NULL);
remote_port = remote_addr[0].port;
if (remote_num == 0 || remote_port == NULL || tunnel_addr_str == NULL
|| local_port == NULL || (password == NULL && key == NULL)) {
usage();
exit(EXIT_FAILURE);
}
#ifdef __MINGW32__
winsock_init();
#endif
if (tcp_incoming_sndbuf != 0 && tcp_incoming_sndbuf < SOCKET_BUF_SIZE) {
tcp_incoming_sndbuf = 0;
}
if (tcp_incoming_sndbuf != 0) {
LOGI("set TCP incoming connection send buffer size to %d", tcp_incoming_sndbuf);
}
if (tcp_incoming_rcvbuf != 0 && tcp_incoming_rcvbuf < SOCKET_BUF_SIZE) {
tcp_incoming_rcvbuf = 0;
}
if (tcp_incoming_rcvbuf != 0) {
LOGI("set TCP incoming connection receive buffer size to %d", tcp_incoming_rcvbuf);
}
if (tcp_outgoing_sndbuf != 0 && tcp_outgoing_sndbuf < SOCKET_BUF_SIZE) {
tcp_outgoing_sndbuf = 0;
}
if (tcp_outgoing_sndbuf != 0) {
LOGI("set TCP outgoing connection send buffer size to %d", tcp_outgoing_sndbuf);
}
if (tcp_outgoing_rcvbuf != 0 && tcp_outgoing_rcvbuf < SOCKET_BUF_SIZE) {
tcp_outgoing_rcvbuf = 0;
}
if (tcp_outgoing_rcvbuf != 0) {
LOGI("set TCP outgoing connection receive buffer size to %d", tcp_outgoing_rcvbuf);
}
if (plugin != NULL) {
uint16_t port = get_local_port();
if (port == 0) {
FATAL("failed to find a free port");
}
snprintf(tmp_port, 8, "%d", port);
if (is_ipv6only(remote_addr, remote_num, ipv6first)) {
plugin_host = "::1";
} else {
plugin_host = "127.0.0.1";
}
plugin_port = tmp_port;
#ifdef __MINGW32__
memset(&plugin_watcher, 0, sizeof(plugin_watcher));
plugin_watcher.port = get_local_port();
if (plugin_watcher.port == 0) {
LOGE("failed to assign a control port for plugin");
}
#endif
LOGI("plugin \"%s\" enabled", plugin);
}
if (method == NULL) {
method = "chacha20-ietf-poly1305";
}
if (timeout == NULL) {
timeout = "60";
}
if (ss_parse_int(timeout, 1, INT_MAX, &timeout_secs) == -1) {
FATAL("invalid timeout");
}
#ifdef HAVE_SETRLIMIT
/*
* 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 (local_addr == NULL) {
if (is_ipv6only(remote_addr, remote_num, ipv6first)) {
local_addr = "::1";
} else {
local_addr = "127.0.0.1";
}
}
if (fast_open == 1) {
#ifdef TCP_FASTOPEN
LOGI("using tcp fast open");
#else
LOGE("tcp fast open is not supported by this environment");
fast_open = 0;
#endif
}
USE_SYSLOG(argv[0], pid_flags);
if (pid_flags) {
daemonize(pid_path);
}
if (ipv6first) {
LOGI("resolving hostname to IPv6 address first");
}
// parse tunnel addr
parse_addr(tunnel_addr_str, &tunnel_addr);
if (tunnel_addr.port == NULL) {
FATAL("tunnel port is not defined");
}
if (validate_tunnel_addr(&tunnel_addr) == -1) {
FATAL("invalid tunnel address");
}
#ifdef __MINGW32__
// Listen on plugin control port
if (plugin != NULL && plugin_watcher.port != 0) {
SOCKET fd;
fd = ss_socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (fd != INVALID_SOCKET) {
plugin_watcher.valid = 0;
do {
struct sockaddr_in addr;
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
addr.sin_port = htons(plugin_watcher.port);
if (bind(fd, (struct sockaddr *)&addr, sizeof(addr))) {
LOGE("failed to bind plugin control port");
break;
}
if (listen(fd, 1)) {
LOGE("failed to listen on plugin control port");
break;
}
plugin_watcher.fd = fd;
ss_io_init(&plugin_watcher.io, plugin_watcher_cb, fd, SS_READ);
ss_io_start(SS_DEFAULT, &plugin_watcher.io);
plugin_watcher.valid = 1;
} while (0);
if (!plugin_watcher.valid) {
closesocket(fd);
plugin_watcher.port = 0;
}
}
}
#endif
if (plugin != NULL) {
int len = 0;
size_t buf_size = 256 * remote_num;
char *remote_str = ss_malloc(buf_size);
snprintf(remote_str, buf_size, "%s", remote_addr[0].host);
len = strlen(remote_str);
for (int i = 1; i < remote_num; i++) {
snprintf(remote_str + len, buf_size - len, "|%s", remote_addr[i].host);
len = strlen(remote_str);
}
int err = start_plugin(plugin, plugin_opts, remote_str,
remote_port, plugin_host, plugin_port,
#ifdef __MINGW32__
plugin_watcher.port,
#endif
MODE_CLIENT);
if (err) {
ERROR("start_plugin");
FATAL("failed to start the plugin");
}
}
#ifndef __MINGW32__
// ignore SIGPIPE
signal(SIGPIPE, SIG_IGN);
signal(SIGABRT, SIG_IGN);
#endif
ss_signal_init(&sigint_watcher, signal_cb, SIGINT);
ss_signal_init(&sigterm_watcher, signal_cb, SIGTERM);
ss_signal_start(SS_DEFAULT, &sigint_watcher);
ss_signal_start(SS_DEFAULT, &sigterm_watcher);
#ifndef __MINGW32__
ss_signal_init(&sigchld_watcher, signal_cb, SIGCHLD);
ss_signal_start(SS_DEFAULT, &sigchld_watcher);
#endif
// Setup keys
LOGI("initializing ciphers... %s", method);
crypto = crypto_init(password, key, method);
if (crypto == NULL)
FATAL("failed to initialize ciphers");
// Setup proxy context
struct listen_ctx listen_ctx;
memset(&listen_ctx, 0, sizeof(struct listen_ctx));
listen_ctx.tunnel_addr = tunnel_addr;
listen_ctx.remote_num = remote_num;
listen_ctx.remote_addr = ss_malloc(sizeof(struct sockaddr *) * remote_num);
memset(listen_ctx.remote_addr, 0, sizeof(struct sockaddr *) * remote_num);
for (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;
if (plugin != NULL) {
host = plugin_host;
port = plugin_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, ipv6first) == -1) {
FATAL("failed to resolve the provided hostname");
}
listen_ctx.remote_addr[i] = (struct sockaddr *)storage;
if (plugin != NULL)
break;
}
listen_ctx.timeout = timeout_secs;
listen_ctx.iface = iface;
listen_ctx.mptcp = mptcp;
LOGI("listening at %s:%s", local_addr, local_port);
struct ss_loop *loop = SS_DEFAULT;
if (mode != UDP_ONLY) {
// Setup socket
int listenfd;
listenfd = create_and_bind(local_addr, local_port);
if (listenfd == -1) {
FATAL("bind() error");
}
if (listen(listenfd, SOMAXCONN) == -1) {
FATAL("listen() error");
}
setnonblocking(listenfd);
listen_ctx.fd = listenfd;
ss_io_init(&listen_ctx.io, accept_cb, listenfd, SS_READ);
ss_io_start(loop, &listen_ctx.io);
}
// Setup UDP
if (mode != TCP_ONLY) {
LOGI("UDP relay enabled");
char *host = remote_addr[0].host;
char *port = remote_addr[0].port == NULL ? remote_port : remote_addr[0].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, ipv6first) == -1) {
FATAL("failed to resolve the provided hostname");
}
struct sockaddr *addr = (struct sockaddr *)storage;
if (init_udprelay(local_addr, local_port, addr, get_sockaddr_len(addr),
tunnel_addr, mtu, crypto, listen_ctx.timeout, iface) == -1) {
FATAL("failed to initialize UDP relay");
}
}
if (mode == UDP_ONLY) {
LOGI("TCP relay disabled");
}
#ifndef __MINGW32__
// setuid
if (user != NULL && !run_as(user)) {
FATAL("failed to switch user");
}
if (geteuid() == 0) {
LOGI("running from root user");
}
#endif
ss_run(loop, 0);
if (plugin != NULL) {
stop_plugin();
}
for (i = 0; i < remote_num; i++)
ss_free(listen_ctx.remote_addr[i]);
ss_free(listen_ctx.remote_addr);
#ifdef __MINGW32__
if (plugin_watcher.valid) {
closesocket(plugin_watcher.fd);
}
winsock_cleanup();
#endif
return ret_val;
}
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