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server.c
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327 lines (285 loc) Β· 10.5 KB
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/**
* Created by leer on 6/22/18.
**/
#include "server.h"
#include "../lib/log.h"
#include "../lib/password.h"
#include "../lib/securesocket.h"
#include <event2/buffer.h>
#include <event2/bufferevent.h>
#include <event2/event.h>
#include <event2/listener.h>
#include <event2/util.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#ifdef _WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#else
// For inet_addr
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/socket.h>
// For gethostbyname
#include <netdb.h>
#endif
#define SOCKS_BUF 257
typedef struct {
// SecureSocket *ss;
bufferevent *remote_bev; // what you really want
bufferevent *local_bev; // listen to lightsocks local
} LsServer;
static event_base *base;
static Password *global_password;
/**
* @brief parse SOCKS5 to get remote addr, and response.
* @param *bev: bufferevent to read
* @param *remote_addr: sockaddr_in must has been alloc
* @see example: parse SOCKS4
* http://www.wangafu.net/~nickm/libevent-book/Ref7_evbuffer.html
* https://www.ietf.org/rfc/rfc1928.txt
* @see evbuffer_pullup()
* @retval None
*/
static int parse_socks5(bufferevent *bev, sockaddr_in *remote_addr) {
// +----+----------+----------+
// |VER | NMETHODS | METHODS |
// +----+----------+----------+
// | 1 | 1 | 1 to 255 |
// +----+----------+----------+
byte buf[SOCKS_BUF] = {0};
int n = decode_read(global_password, bev, buf, SOCKS_BUF);
log_d("read %d bytes", n);
if (buf[0] != 0x05) {
log_e("SOCKS5 only!");
return -1;
}
// +----+--------+
// |VER | METHOD |
// +----+--------+
// | 1 | 1 |
// +----+--------+
byte reply_auth[2] = {0x05, 0x00};
encode_data(reply_auth, 2, global_password);
n = bufferevent_write(bev, reply_auth, 2);
// n = encode_write(global_password, bev, reply_auth, 2);
log_d("write %d bytes", n);
// sub-negotiation
//
// * +----+-----+-------+------+----------+----------+
// |VER | CMD | RSV | ATYP | DST.ADDR | DST.PORT |
// +----+-----+-------+------+----------+----------+
// | 1 | 1 | X'00' | 1 | Variable | 2 |
// +----+-----+-------+------+----------+----------+
n = decode_read(global_password, bev, buf, SOCKS_BUF);
log_d("read %d bytes", n);
if (buf[1] != 0x01) {
log_e("CONNECT only");
return -1;
}
// ATYP address type of following address
// IP V4 address: X'01'
// DOMAINNAME: X'03'
// IP V6 address: X'04'
remote_addr->sin_family = AF_INET;
remote_addr->sin_port = htons(buf[n - 2] << 8 | buf[n - 1]);
int name_len = n - 4 - 2;
char domain[name_len];
switch (buf[3]) {
case 0x01:
log_w("IP v4");
in_addr_t ipv4 = buf[4] << 24 | buf[5] << 16 | buf[6] << 8 | buf[7];
remote_addr->sin_addr.s_addr = htonl(ipv4);
// remote_addr->sin_port = htons(buf[8] << 8 | buf[9]);
break;
case 0x03:
log_w("domain name");
for (int i = 0; i < name_len; i++) {
domain[i] = buf[i + 4];
}
// remote_addr->sin_port = htons(buf[n - 2] << 8 | buf[n - 1]);
log_d("resolve domain: %s", domain);
struct hostent *host = gethostbyname(domain);
remote_addr->sin_addr.s_addr = ((struct in_addr *)host->h_name)->s_addr;
// struct addrinfo hints, *res;
// memset(&hints, 0, sizeof hints);
// hints.ai_family = AF_INET; // IPv4
// hints.ai_socktype = SOCK_STREAM;
// // hints.ai_flags = AI_PASSIVE;
// status = getaddrinfo(domain, ntohs(remote_addr->sin_port), &hints, &res);
return -1;
break;
case 0x04:
log_w("IP v4 only");
return -1;
break;
default:
log_e("ATYP error");
return -1;
break;
}
return 0;
// byte auth_buf[] = evbuffer_pullup(bufferevent_get_input(bev), 3);
}
// read from remote, then encode data send to Lslocal
void remote_readcb(bufferevent *remote_bev, void *arg) {
LsServer *server = arg;
check(server, "null context");
check(encode_copy_pass(global_password, server->local_bev, remote_bev) != -1,
"read error");
return;
error:
bufferevent_clear_free(server->local_bev);
bufferevent_clear_free(remote_bev);
}
// read from Lslocal, prase SOCKS5, dial real remote addr.
void local_readcb(bufferevent *bev, void *arg) {
LsServer *server = arg;
check(server, "null context");
bufferevent *remote_bev;
sockaddr_in remote_addr; // connect to remote
memset(&remote_addr, 0, sizeof(sockaddr_in));
// parse socks5
check(parse_socks5(bev, &remote_addr) != -1, "parse socks5 error");
remote_bev = bufferevent_socket_new(
base, -1, BEV_OPT_CLOSE_ON_FREE | BEV_OPT_DEFER_CALLBACKS);
int rc = bufferevent_socket_connect(
remote_bev, (struct sockaddr *)&remote_addr, sizeof(struct sockaddr_in));
check(rc != -1, "can't connect remote server");
log_d("connected to remote server");
// disable linger
int remotefd = bufferevent_getfd(remote_bev);
struct linger linger;
memset(&linger, 0, sizeof(struct linger));
check(setsockopt(remotefd, SOL_SOCKET, SO_LINGER, (const void *)&linger,
sizeof(struct linger)) == 0,
"can't disable linger");
server->remote_bev = remote_bev;
bufferevent_setcb(remote_bev, remote_readcb, NULL, NULL, server);
bufferevent_enable(remote_bev, EV_READ | EV_WRITE);
//+----+-----+-------+------+----------+----------+
//|VER | REP | RSV | ATYP | BND.ADDR | BND.PORT |
//+----+-----+-------+------+----------+----------+
//| 1 | 1 | X'00' | 1 | Variable | 2 |
//+----+-----+-------+------+----------+----------+
// concted to remote server , send socks5 reply to Lslocal
byte socks5_reply[] = {0x05, 0x00, 0x00, 0x01, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00};
encode_write(global_password, bev, socks5_reply, 10);
// SOCKS5 FINISH, START TRANSMIT
// read data from local bev, then decode data and send to remote server
check(decode_copy_pass(global_password, remote_bev, bev) != -1, "read error");
return;
error:
bufferevent_clear_free(bev);
bufferevent_clear_free(remote_bev);
}
void local_eventcb(bufferevent *bev, short events, void *arg) {
if (events && (BEV_EVENT_EOF | BEV_EVENT_ERROR)) {
// event_base *base = arg;
LsServer *server = arg;
if (bev) {
bufferevent_clear_free(bev); // client->local_bev
if (server) {
bufferevent_clear_free(server->remote_bev);
free(server);
}
}
if (events & BEV_EVENT_EOF) {
log_d("connection %d closed", bufferevent_getfd(bev));
} else if (events & BEV_EVENT_ERROR) {
log_e("got an error on the connection");
}
}
}
void local_listener_cb(evconnlistener *listener, evutil_socket_t fd,
struct sockaddr *sa, int socklen, void *arg) {
// set nonblocking
check(evutil_make_socket_nonblocking(fd) == 0, "can't make no blocking");
// no waiting for unsent data before closing socketing
struct linger linger;
memset(&linger, 0, sizeof(struct linger));
check(setsockopt(fd, SOL_SOCKET, SO_LINGER, (const void *)&linger,
sizeof(struct linger)) == 0,
"can't disable linger");
Password *pass = arg;
LsServer *ls_server = calloc(1, sizeof(LsServer));
bufferevent *local_bev, *remote_bev;
local_bev = bufferevent_socket_new(
base, fd, BEV_OPT_CLOSE_ON_FREE | BEV_OPT_DEFER_CALLBACKS);
log_d("new client conncted");
ls_server->local_bev = local_bev;
bufferevent_setcb(local_bev, local_readcb, NULL, local_eventcb, ls_server);
bufferevent_enable(local_bev, EV_READ | EV_WRITE);
return;
error:
bufferevent_clear_free(local_bev);
free(ls_server);
}
void listener_errorcb(evconnlistener *listener, void *arg) {
log_e("listen error, exit");
event_base_loopbreak(base);
}
void signal_cb(evutil_socket_t sig, short events, void *user_data) {
event_base *base = user_data;
struct timeval delay = {1, 0};
log_d("caught an interrupt signal; exiting cleanly in one "
"seconds");
event_base_loopexit(base, &delay);
}
int main() {
log_d("lightsocks-server: starting...");
// todo read password form json
// ss->password = rand_password();
global_password = calloc(1, sizeof(Password));
byte table[] = {
162, 135, 28, 12, 149, 252, 19, 6, 147, 47, 146, 53, 37, 143, 65,
226, 77, 92, 115, 157, 151, 79, 26, 16, 89, 36, 82, 41, 153, 129,
184, 23, 203, 160, 110, 250, 170, 42, 124, 182, 117, 233, 125, 5, 94,
176, 249, 91, 59, 136, 76, 199, 205, 139, 108, 225, 43, 243, 140, 152,
116, 171, 103, 48, 188, 17, 49, 27, 228, 102, 158, 50, 90, 3, 232,
224, 173, 60, 132, 213, 45, 98, 118, 254, 211, 210, 128, 207, 175, 201,
163, 206, 55, 161, 165, 0, 126, 154, 97, 198, 1, 183, 181, 239, 222,
167, 39, 15, 58, 51, 236, 195, 96, 245, 131, 85, 9, 127, 142, 8,
84, 185, 134, 166, 174, 218, 114, 155, 46, 7, 21, 104, 69, 194, 248,
137, 99, 159, 10, 62, 172, 169, 138, 71, 220, 193, 216, 208, 179, 241,
235, 130, 189, 180, 88, 64, 31, 24, 75, 192, 133, 123, 70, 255, 63,
144, 231, 197, 87, 78, 18, 240, 119, 164, 145, 106, 190, 52, 80, 20,
227, 196, 223, 202, 242, 244, 95, 22, 14, 230, 25, 74, 122, 4, 200,
215, 38, 221, 204, 86, 105, 68, 238, 247, 214, 177, 2, 212, 66, 148,
111, 187, 35, 109, 61, 168, 32, 30, 56, 178, 40, 112, 34, 209, 93,
67, 251, 217, 237, 107, 73, 113, 83, 234, 29, 253, 191, 72, 186, 120,
33, 13, 229, 44, 150, 219, 57, 121, 81, 141, 11, 156, 54, 100, 101,
246};
for (int i = 0; i < PASS_LENGTH; i++) {
global_password->x[i] = table[i];
}
event *signal_event;
evconnlistener *listener;
sockaddr_in local; // listen to local
memset(&local, 0, sizeof(sockaddr_in));
local.sin_family = AF_INET;
int local_port = 42619;
local.sin_port = htons(local_port);
local.sin_addr.s_addr = htonl(INADDR_ANY);
base = event_base_new();
listener =
evconnlistener_new_bind(base, local_listener_cb, global_password,
LEV_OPT_CLOSE_ON_FREE | LEV_OPT_REUSEABLE, 16,
(struct sockaddr *)&local, sizeof(local));
check(listener, "listen error");
evconnlistener_set_error_cb(listener, listener_errorcb);
log_d("\nListen on [::]:%d\nPassword:\n%s", local_port,
password_string(global_password, NULL));
// add Ctrl-C signal event
signal_event = evsignal_new(base, SIGINT, signal_cb, base);
event_add(signal_event, NULL);
event_base_dispatch(base);
error: // fall
free(global_password);
event_base_free(base);
evconnlistener_free(listener);
event_free(signal_event);
return 0;
}