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redir.c
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/*
* redir.c - Provide a transparent TCP proxy through remote shadowsocks
* server
*
* Copyright (C) 2013 - 2015, Max Lv <[email protected]>
*
* 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 <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>
#include <libcork/core.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "http.h"
#include "tls.h"
#include "netutils.h"
#include "utils.h"
#include "redir.h"
#include "common.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
#include "includeobfs.h" // I don't want to modify makefile
#include "jconf.h"
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, listen_ctx_t* profile);
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;
int keep_resolving = 1;
static int ipv6first = 0;
static int mode = TCP_ONLY;
#ifdef HAVE_SETRLIMIT
static int nofile = 0;
#endif
static struct cork_dllist inactive_profiles;
static listen_ctx_t *current_profile;
static struct cork_dllist all_connections;
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;
server_def_t *server_env = server->server_env;
ssize_t r = recv(server->fd, remote->buf->array + remote->buf->len,
BUF_SIZE - remote->buf->len, 0);
if (r == 0) {
// connection closed
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;
} else if (r == -1) {
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;
}
}
remote->buf->len += r;
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=%zu, recv=%zd", ipstr, port, remote->buf->len, r);
}
if (!remote->send_ctx->connected) {
// SNI
int ret = 0;
uint16_t port = 0;
if (AF_INET6 == server->destaddr.ss_family) { // IPv6
port = ntohs(((struct sockaddr_in6 *)&(server->destaddr))->sin6_port);
} else { // IPv4
port = ntohs(((struct sockaddr_in *)&(server->destaddr))->sin_port);
}
if (port == http_protocol->default_port)
ret = http_protocol->parse_packet(remote->buf->array,
remote->buf->len, &server->hostname);
else if (port == tls_protocol->default_port)
ret = tls_protocol->parse_packet(remote->buf->array,
remote->buf->len, &server->hostname);
if (ret > 0) {
server->hostname_len = ret;
}
ev_io_stop(EV_A_ & server_recv_ctx->io);
ev_io_start(EV_A_ & remote->send_ctx->io);
return;
}
// SSR beg
if (server_env->protocol_plugin) {
obfs_class *protocol_plugin = server_env->protocol_plugin;
if (protocol_plugin->client_pre_encrypt) {
remote->buf->len = protocol_plugin->client_pre_encrypt(server->protocol, &remote->buf->array, remote->buf->len, &remote->buf->capacity);
}
}
int err = ss_encrypt(&server_env->cipher, 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;
}
if (server_env->obfs_plugin) {
obfs_class *obfs_plugin = server_env->obfs_plugin;
if (obfs_plugin->client_encode) {
remote->buf->len = obfs_plugin->client_encode(server->obfs, &remote->buf->array, remote->buf->len, &remote->buf->capacity);
}
}
// SSR end
if (!remote->send_ctx->connected) {
ev_io_stop(EV_A_ & server_recv_ctx->io);
ev_io_start(EV_A_ & remote->send_ctx->io);
return;
}
if (r > 0 && remote->buf->len == 0) { // SSR pause recv
remote->buf->idx = 0;
ev_io_stop(EV_A_ & server_recv_ctx->io);
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;
} else {
remote->buf->idx = 0;
remote->buf->len = 0;
}
}
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 == -1) {
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
= cork_container_of(watcher, remote_ctx_t, watcher);
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;
server_def_t *server_env = server->server_env;
ev_timer_again(EV_A_ & remote->recv_ctx->watcher);
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 == -1) {
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;
// SSR beg
if (server_env->obfs_plugin) {
obfs_class *obfs_plugin = server_env->obfs_plugin;
if (obfs_plugin->client_decode) {
int needsendback;
server->buf->len = obfs_plugin->client_decode(server->obfs, &server->buf->array, server->buf->len, &server->buf->capacity, &needsendback);
if ((int)server->buf->len < 0) {
LOGE("client_decode");
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;
}
if (needsendback) {
obfs_class *obfs_plugin = server_env->obfs_plugin;
if (obfs_plugin->client_encode) {
remote->buf->len = obfs_plugin->client_encode(server->obfs, &remote->buf->array, 0, &remote->buf->capacity);
ssize_t s = send(remote->fd, remote->buf->array, remote->buf->len, 0);
if (s == -1) {
if (errno != EAGAIN && errno != EWOULDBLOCK) {
ERROR("remote_send_cb_send");
// close and free
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
}
return;
} else if (s < (ssize_t)(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);
}
}
}
}
}
if ( server->buf->len == 0 )
return;
int err = ss_decrypt(&server_env->cipher, 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;
}
if (server_env->protocol_plugin) {
obfs_class *protocol_plugin = server_env->protocol_plugin;
if (protocol_plugin->client_post_decrypt) {
server->buf->len = protocol_plugin->client_post_decrypt(server->protocol, &server->buf->array, server->buf->len, &server->buf->capacity);
if ((int)server->buf->len < 0) {
LOGE("client_post_decrypt");
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;
}
if ( server->buf->len == 0 )
return;
}
}
// SSR end
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);
} else {
ERROR("send");
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
}
} 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);
}
}
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;
server_def_t *server_env = server->server_env;
if (!remote_send_ctx->connected) {
struct sockaddr_storage addr;
memset(&addr, 0, sizeof(struct sockaddr_storage));
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);
ev_timer_start(EV_A_ & remote->recv_ctx->watcher);
// send destaddr
buffer_t ss_addr_to_send;
buffer_t *abuf = &ss_addr_to_send;
balloc(abuf, BUF_SIZE);
if (server->hostname_len > 0
&& validate_hostname(server->hostname, server->hostname_len)) { // HTTP/SNI
uint16_t port;
if (AF_INET6 == server->destaddr.ss_family) { // IPv6
port = (((struct sockaddr_in6 *)&(server->destaddr))->sin6_port);
} else { // IPv4
port = (((struct sockaddr_in *)&(server->destaddr))->sin_port);
}
abuf->array[abuf->len++] = 3; // Type 3 is hostname
abuf->array[abuf->len++] = server->hostname_len;
memcpy(abuf->array + abuf->len, server->hostname, server->hostname_len);
abuf->len += server->hostname_len;
memcpy(abuf->array + abuf->len, &port, 2);
} else 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 (remote->buf->len > 0) {
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;
} else {
brealloc(remote->buf, abuf->len, BUF_SIZE);
memcpy(remote->buf->array, abuf->array, abuf->len);
remote->buf->len = abuf->len;
}
bfree(abuf);
// SSR beg
server_info _server_info;
if (server_env->obfs_plugin) {
server_env->obfs_plugin->get_server_info(server->obfs, &_server_info);
_server_info.head_len = get_head_size(remote->buf->array, remote->buf->len, 30);
server_env->obfs_plugin->set_server_info(server->obfs, &_server_info);
}
if (server_env->protocol_plugin) {
obfs_class *protocol_plugin = server_env->protocol_plugin;
if (protocol_plugin->client_pre_encrypt) {
remote->buf->len = protocol_plugin->client_pre_encrypt(server->protocol, &remote->buf->array, remote->buf->len, &remote->buf->capacity);
}
}
int err = ss_encrypt(&server_env->cipher, 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;
}
if (server_env->obfs_plugin) {
obfs_class *obfs_plugin = server_env->obfs_plugin;
if (obfs_plugin->client_encode) {
remote->buf->len = obfs_plugin->client_encode(server->obfs, &remote->buf->array, remote->buf->len, &remote->buf->capacity);
}
}
// SSR end
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 == -1) {
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 = ss_malloc(sizeof(remote_t));
memset(remote, 0, sizeof(remote_t));
remote->buf = ss_malloc(sizeof(buffer_t));
remote->recv_ctx = ss_malloc(sizeof(remote_ctx_t));
remote->send_ctx = ss_malloc(sizeof(remote_ctx_t));
balloc(remote->buf, BUF_SIZE);
memset(remote->recv_ctx, 0, sizeof(remote_ctx_t));
memset(remote->send_ctx, 0, sizeof(remote_ctx_t));
remote->recv_ctx->connected = 0;
remote->send_ctx->connected = 0;
remote->fd = fd;
remote->recv_ctx->remote = remote;
remote->send_ctx->remote = remote;
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);
ev_timer_init(&remote->recv_ctx->watcher, remote_timeout_cb,
timeout, 0);
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_timer_stop(EV_A_ & remote->recv_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, listen_ctx_t* profile) {
server_t *server = ss_malloc(sizeof(server_t));
memset(server, 0, sizeof(server_t));
server->listener = profile;
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, BUF_SIZE);
memset(server->recv_ctx, 0, sizeof(server_ctx_t));
memset(server->send_ctx, 0, sizeof(server_ctx_t));
server->recv_ctx->connected = 0;
server->send_ctx->connected = 0;
server->fd = fd;
server->recv_ctx->server = server;
server->send_ctx->server = server;
server->hostname = NULL;
server->hostname_len = 0;
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);
cork_dllist_add(&profile->connections_eden, &server->entries);
cork_dllist_add(&all_connections, &server->entries_all);
return server;
}
static void
release_profile(listen_ctx_t *profile)
{
int i;
for(i = 0; i < profile->server_num; i++)
{
server_def_t *server_env = &profile->servers[i];
ss_free(server_env->host);
if(server_env->addr != server_env->addr_udp)
{
ss_free(server_env->addr_udp);
}
ss_free(server_env->addr);
ss_free(server_env->psw);
ss_free(server_env->protocol_name);
ss_free(server_env->obfs_name);
ss_free(server_env->protocol_param);
ss_free(server_env->obfs_param);
ss_free(server_env->protocol_global);
ss_free(server_env->obfs_global);
if(server_env->protocol_plugin){
free_obfs_class(server_env->protocol_plugin);
}
if(server_env->obfs_plugin){
free_obfs_class(server_env->obfs_plugin);
}
ss_free(server_env->id);
ss_free(server_env->group);
enc_release(&server_env->cipher);
}
ss_free(profile);
}
static void
check_and_free_profile(listen_ctx_t *profile)
{
int i;
if(profile == current_profile)
{
return;
}
// if this connection is created from an inactive profile, then we need to free the profile
// when the last connection of that profile is colsed
if(!cork_dllist_is_empty(&profile->connections_eden))
{
return;
}
for(i = 0; i < profile->server_num; i++)
{
if(!cork_dllist_is_empty(&profile->servers[i].connections))
{
return;
}
}
// No connections anymore
cork_dllist_remove(&profile->entries);
release_profile(profile);
}
static void
free_server(server_t *server)
{
if(server != NULL) {
listen_ctx_t *profile = server->listener;
server_def_t *server_env = server->server_env;
cork_dllist_remove(&server->entries);
cork_dllist_remove(&server->entries_all);
if (server->remote != NULL) {
server->remote->server = NULL;
}
if (server->buf != NULL) {
bfree(server->buf);
ss_free(server->buf);
}
if (server->hostname != NULL) {
ss_free(server->hostname);
}
// if (server != NULL) {
// if (server->remote != NULL) {
// server->remote->server = NULL;
// }
if (server_env) {
if (server->e_ctx != NULL) {
enc_ctx_release(&server_env->cipher, server->e_ctx);
ss_free(server->e_ctx);
}
if (server->d_ctx != NULL) {
enc_ctx_release(&server_env->cipher, server->d_ctx);
ss_free(server->d_ctx);
}
// if (server->buf != NULL) {
// bfree(server->buf);
// ss_free(server->buf);
// }
// SSR beg
if (server_env->obfs_plugin) {
server_env->obfs_plugin->dispose(server->obfs);
server->obfs = NULL;
// free_obfs_class(server->obfs_plugin);
// server->obfs_plugin = NULL;
}
if (server_env->protocol_plugin) {
server_env->protocol_plugin->dispose(server->protocol);
server->protocol = NULL;
// free_obfs_class(server->protocol_plugin);
// server->protocol_plugin = NULL;
}
// SSR end
}
ss_free(server->recv_ctx);
ss_free(server->send_ctx);
ss_free(server);
// after free server, we need to check the profile
check_and_free_profile(profile);
}
}
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;
memset(&destaddr, 0, sizeof(struct sockaddr_storage));
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
// pick a server
int index = rand() % listener->server_num;
server_def_t *server_env = &listener->servers[index];
struct sockaddr *remote_addr = (struct sockaddr *) server_env->addr;
int remotefd = socket(remote_addr->sa_family, SOCK_STREAM, IPPROTO_TCP);
if (remotefd == -1) {
ERROR("socket");
return;
}
// Set flags
setsockopt(remotefd, SOL_TCP, TCP_NODELAY, &opt, sizeof(opt));
#ifdef SO_NOSIGPIPE
setsockopt(remotefd, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof(opt));
#endif
// Setup
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);
// Enable MPTCP
if (listener->mptcp == 1) {
int err = setsockopt(remotefd, SOL_TCP, MPTCP_ENABLED, &opt, sizeof(opt));
if (err == -1) {
ERROR("failed to enable multipath TCP");
}
}
server_t *server = new_server(serverfd, listener);
remote_t *remote = new_remote(remotefd, listener->timeout);
server->destaddr = destaddr;
server->server_env = server_env;
// expelled from eden
cork_dllist_remove(&server->entries);
cork_dllist_add(&server_env->connections, &server->entries);
int r = connect(remotefd, remote_addr, get_sockaddr_len(remote_addr));
if (r == -1 && errno != CONNECT_IN_PROGRESS) {
ERROR("connect");
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;
}
// init server cipher
if (server_env->cipher.enc_method > TABLE) {
server->e_ctx = ss_malloc(sizeof(struct enc_ctx));
server->d_ctx = ss_malloc(sizeof(struct enc_ctx));
enc_ctx_init(&server_env->cipher, server->e_ctx, 1);
enc_ctx_init(&server_env->cipher, server->d_ctx, 0);
} else {
server->e_ctx = NULL;
server->d_ctx = NULL;
}
// SSR beg
// remote->remote_index = index;
// server->obfs_plugin = new_obfs_class(listener->obfs_name);
// if (server->obfs_plugin) {
// server->obfs = server->obfs_plugin->new_obfs();
// }
// server->protocol_plugin = new_obfs_class(listener->protocol_name);
// if (server->protocol_plugin) {
// server->protocol = server->protocol_plugin->new_obfs();
// }
// if (listener->list_obfs_global[remote->remote_index] == NULL && server->obfs_plugin) {
// listener->list_obfs_global[remote->remote_index] = server->obfs_plugin->init_data();
// }
// if (listener->list_protocol_global[remote->remote_index] == NULL && server->protocol_plugin) {
// listener->list_protocol_global[remote->remote_index] = server->protocol_plugin->init_data();
// }
server_info _server_info;
memset(&_server_info, 0, sizeof(server_info));
strcpy(_server_info.host, server_env->host);
_server_info.port = server_env->port;
_server_info.param = server_env->obfs_param;
_server_info.g_data = server_env->obfs_global;
_server_info.head_len = (AF_INET6 == server->destaddr.ss_family ? 19 : 7);
_server_info.iv = server->e_ctx->evp.iv;
_server_info.iv_len = enc_get_iv_len(&server_env->cipher);
_server_info.key = enc_get_key(&server_env->cipher);
_server_info.key_len = enc_get_key_len(&server_env->cipher);
_server_info.tcp_mss = 1452;
_server_info.buffer_size = BUF_SIZE;
_server_info.cipher_env = &server_env->cipher;
if (server_env->obfs_plugin) {
server->obfs = server_env->obfs_plugin->new_obfs();
server_env->obfs_plugin->set_server_info(server->obfs, &_server_info);