mirror of
https://github.com/hufrea/byedpi.git
synced 2024-12-22 14:25:44 +00:00
470 lines
11 KiB
C
470 lines
11 KiB
C
#include "extend.h"
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#ifdef _WIN32
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#include <ws2tcpip.h>
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#ifndef TCP_MAXRT
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#define TCP_MAXRT 5
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#endif
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#else
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#include <arpa/inet.h>
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#include <netinet/tcp.h>
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#include <sys/un.h>
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#include <sys/time.h>
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#endif
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#include <string.h>
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#include <assert.h>
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#include "proxy.h"
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#include "error.h"
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#include "params.h"
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#include "desync.h"
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#include "packets.h"
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int set_timeout(int fd, unsigned int s)
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{
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#ifdef __linux__
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if (setsockopt(fd, IPPROTO_TCP,
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TCP_USER_TIMEOUT, (char *)&s, sizeof(s))) {
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uniperror("setsockopt TCP_USER_TIMEOUT");
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return -1;
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}
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#else
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#ifdef _WIN32
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if (setsockopt(fd, IPPROTO_TCP,
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TCP_MAXRT, (char *)&s, sizeof(s))) {
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uniperror("setsockopt TCP_MAXRT");
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return -1;
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}
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#endif
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#endif
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return 0;
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}
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int mode_add_get(struct sockaddr_ina *dst, int m)
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{
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// m < 0: get, m > 0: set, m == 0: delete
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assert(m >= -1 && m < params.dp_count);
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time_t t = 0;
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struct elem *val = 0;
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char *str = (char *)&dst->in;
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int len = 0;
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if (dst->sa.sa_family == AF_INET) {
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len = sizeof(dst->in);
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}
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else {
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len = sizeof(dst->in6) - sizeof(dst->in6.sin6_scope_id);
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}
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len -= sizeof(dst->sa.sa_family);
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assert(len > 0);
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if (m == 0) {
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mem_delete(params.mempool, str, len);
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return 0;
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}
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else if (m > 0) {
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time(&t);
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val = mem_add(params.mempool, str, len);
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if (!val) {
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uniperror("mem_add");
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return -1;
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}
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val->m = m;
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val->time = t;
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return 0;
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}
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val = mem_get(params.mempool, str, len);
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if (!val) {
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return -1;
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}
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time(&t);
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if (t > val->time + params.cache_ttl) {
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LOG(LOG_S, "time=%ld, now=%ld, ignore\n", val->time, t);
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return 0;
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}
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return val->m;
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}
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static inline bool check_port(uint16_t *p, struct sockaddr_in6 *dst)
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{
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return (dst->sin6_port >= p[0]
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&& dst->sin6_port <= p[1]);
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}
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int connect_hook(struct poolhd *pool, struct eval *val,
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struct sockaddr_ina *dst, int next)
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{
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int m = mode_add_get(dst, -1);
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val->cache = (m == 0);
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val->attempt = m < 0 ? 0 : m;
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return create_conn(pool, val, dst, next);
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}
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int socket_mod(int fd, struct sockaddr *dst)
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{
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if (params.custom_ttl) {
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if (setttl(fd, params.def_ttl, get_family(dst)) < 0) {
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return -1;
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}
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}
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if (params.protect_path) {
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return protect(fd, params.protect_path);
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}
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return 0;
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}
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int reconnect(struct poolhd *pool, struct eval *val, int m)
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{
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struct eval *client = val->pair;
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if (create_conn(pool, client,
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(struct sockaddr_ina *)&val->in6, EV_DESYNC)) {
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return -1;
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}
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val->pair = 0;
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del_event(pool, val);
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client->type = EV_IGNORE;
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client->attempt = m;
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client->cache = 1;
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client->buff.offset = 0;
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return 0;
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}
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bool check_host(struct mphdr *hosts, struct eval *val)
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{
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char *host = 0;
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int len;
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if (!(len = parse_tls(val->buff.data, val->buff.size, &host))) {
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len = parse_http(val->buff.data, val->buff.size, &host, 0);
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}
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assert(len == 0 || host != 0);
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if (len <= 0) {
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return 0;
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}
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char *e = host + len;
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for (; host < e; host++) {
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if (mem_get(hosts, host, e - host)) {
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return 1;
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}
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if (!(host = memchr(host, '.', e - host))) {
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return 0;
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}
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}
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return 0;
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}
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bool check_proto_tcp(int proto, struct eval *val)
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{
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if (proto & IS_TCP) {
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return 1;
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}
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else if ((proto & IS_HTTP) &&
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is_http(val->buff.data, val->buff.size)) {
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return 1;
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}
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else if ((proto & IS_HTTPS) &&
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is_tls_chello(val->buff.data, val->buff.size)) {
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return 1;
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}
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return 0;
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}
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int on_torst(struct poolhd *pool, struct eval *val)
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{
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int m = val->pair->attempt + 1;
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for (; m < params.dp_count; m++) {
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struct desync_params *dp = ¶ms.dp[m];
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if (!dp->detect) {
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return -1;
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}
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if (dp->detect & DETECT_TORST) {
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break;
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}
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}
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if (m >= params.dp_count) {
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mode_add_get(
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(struct sockaddr_ina *)&val->in6, 0);
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return -1;
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}
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return reconnect(pool, val, m);
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}
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int on_response(struct poolhd *pool, struct eval *val,
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char *resp, ssize_t sn)
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{
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int m = val->pair->attempt + 1;
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char *req = val->pair->buff.data;
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ssize_t qn = val->pair->buff.size;
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for (; m < params.dp_count; m++) {
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struct desync_params *dp = ¶ms.dp[m];
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if (!dp->detect) {
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return -1;
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}
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if ((dp->detect & DETECT_HTTP_LOCAT)
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&& is_http_redirect(req, qn, resp, sn)) {
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break;
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}
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else if ((dp->detect & DETECT_TLS_INVSID)
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&& neq_tls_sid(req, qn, resp, sn)) {
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break;
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}
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else if ((dp->detect & DETECT_TLS_ALERT)
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&& is_tls_alert(resp, sn)) {
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break;
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}
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else if (dp->detect & DETECT_HTTP_CLERR) {
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int code = get_http_code(resp, sn);
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if (code > 400 && code < 451 && code != 429) {
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break;
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}
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}
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}
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if (m < params.dp_count) {
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return reconnect(pool, val, m);
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}
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return -1;
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}
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static inline void to_tunnel(struct eval *client)
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{
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client->pair->type = EV_TUNNEL;
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client->type = EV_TUNNEL;
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assert(client->buff.data);
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free(client->buff.data);
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client->buff.data = 0;
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client->buff.size = 0;
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client->buff.offset = 0;
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}
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int on_tunnel_check(struct poolhd *pool, struct eval *val,
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char *buffer, size_t bfsize, int out)
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{
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assert(!out);
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ssize_t n = recv(val->fd, buffer, bfsize, 0);
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if (n < 1) {
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if (n) uniperror("recv");
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switch (get_e()) {
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case ECONNRESET:
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case ECONNREFUSED:
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case ETIMEDOUT:
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break;
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default: return -1;
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}
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return on_torst(pool, val);
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}
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//
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if (on_response(pool, val, buffer, n) == 0) {
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return 0;
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}
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val->recv_count += n;
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struct eval *pair = val->pair;
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ssize_t sn = send(pair->fd, buffer, n, 0);
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if (n != sn) {
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uniperror("send");
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return -1;
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}
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to_tunnel(pair);
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if (params.timeout &&
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set_timeout(val->fd, 0)) {
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return -1;
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}
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int m = pair->attempt;
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if (!pair->cache) {
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return 0;
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}
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struct sockaddr_ina *addr = (struct sockaddr_ina *)&val->in6;
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if (m == 0) {
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LOG(LOG_S, "delete ip: m=%d\n", m);
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} else {
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INIT_ADDR_STR((*addr));
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LOG(LOG_S, "save ip: %s, m=%d\n", ADDR_STR, m);
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}
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return mode_add_get(addr, m);
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}
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int on_desync_again(struct poolhd *pool,
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struct eval *val, char *buffer, size_t bfsize)
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{
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if (val->flag == FLAG_CONN) {
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if (mod_etype(pool, val, POLLIN)) {
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uniperror("mod_etype");
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return -1;
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}
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val = val->pair;
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}
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int m = val->attempt;
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LOG((m ? LOG_S : LOG_L), "desync params index: %d\n", m);
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ssize_t n = val->buff.size;
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assert(n > 0 && n <= params.bfsize);
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memcpy(buffer, val->buff.data, n);
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if (params.timeout &&
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set_timeout(val->pair->fd, params.timeout)) {
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return -1;
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}
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ssize_t sn = desync(val->pair->fd, buffer, bfsize, n,
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val->buff.offset, (struct sockaddr *)&val->pair->in6, m);
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if (sn < 0) {
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return -1;
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}
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val->buff.offset += sn;
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if (sn < n) {
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if (mod_etype(pool, val->pair, POLLOUT)) {
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uniperror("mod_etype");
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return -1;
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}
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val->pair->type = EV_DESYNC;
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return 0;
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}
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val->pair->type = EV_PRE_TUNNEL;
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return 0;
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}
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int on_desync(struct poolhd *pool, struct eval *val,
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char *buffer, size_t bfsize, int out)
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{
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if (out) {
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return on_desync_again(pool, val, buffer, bfsize);
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}
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if (val->buff.size == bfsize) {
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to_tunnel(val);
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return 0;
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}
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ssize_t n = recv(val->fd, buffer, bfsize - val->buff.size, 0);
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if (n <= 0) {
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if (n) uniperror("recv data");
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return -1;
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}
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val->buff.size += n;
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val->recv_count += n;
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val->buff.data = realloc(val->buff.data, val->buff.size);
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if (val->buff.data == 0) {
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uniperror("realloc");
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return -1;
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}
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memcpy(val->buff.data + val->buff.size - n, buffer, n);
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int m = val->attempt;
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if (!m) for (; m < params.dp_count; m++) {
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struct desync_params *dp = ¶ms.dp[m];
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if (!dp->detect &&
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(!dp->pf[0] || check_port(dp->pf, &val->pair->in6)) &&
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(!dp->proto || check_proto_tcp(dp->proto, val)) &&
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(!dp->hosts || check_host(dp->hosts, val))) {
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break;
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}
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}
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if (m >= params.dp_count) {
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return -1;
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}
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val->attempt = m;
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return on_desync_again(pool, val, buffer, bfsize);
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}
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ssize_t udp_hook(struct eval *val,
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char *buffer, size_t bfsize, ssize_t n, struct sockaddr_ina *dst)
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{
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if (val->recv_count) {
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return send(val->fd, buffer, n, 0);
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}
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int m = val->attempt;
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if (!m) for (; m < params.dp_count; m++) {
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struct desync_params *dp = ¶ms.dp[m];
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if (!dp->detect &&
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(!dp->proto || (dp->proto & IS_UDP)) &&
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(!dp->pf[0] || check_port(dp->pf, &dst->in6))) {
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break;
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}
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}
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if (m >= params.dp_count) {
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return -1;
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}
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return desync_udp(val->fd, buffer, bfsize, n, &dst->sa, m);
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}
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#ifdef __linux__
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int protect(int conn_fd, const char *path)
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{
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struct sockaddr_un sa;
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sa.sun_family = AF_UNIX;
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strcpy(sa.sun_path, path);
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int fd = socket(AF_UNIX, SOCK_STREAM, 0);
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if (fd < 0) {
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uniperror("socket");
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return -1;
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}
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struct timeval tv = { .tv_sec = 1 };
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setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
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setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
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int err = connect(fd, (struct sockaddr *)&sa, sizeof(sa));
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if (err) {
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uniperror("connect");
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close(fd);
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return -1;
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}
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char buf[CMSG_SPACE(sizeof(fd))] = {};
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struct iovec io = { .iov_base = "1", .iov_len = 1 };
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struct msghdr msg = { .msg_iov = &io };
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msg.msg_iovlen = 1;
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msg.msg_control = buf;
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msg.msg_controllen = sizeof(buf);
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struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_RIGHTS;
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cmsg->cmsg_len = CMSG_LEN(sizeof(conn_fd));
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*((int *)CMSG_DATA(cmsg)) = conn_fd;
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msg.msg_controllen = CMSG_SPACE(sizeof(conn_fd));
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if (sendmsg(fd, &msg, 0) < 0) {
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uniperror("sendmsg");
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close(fd);
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return -1;
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}
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if (recv(fd, buf, 1, 0) < 1) {
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uniperror("recv");
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close(fd);
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return -1;
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}
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close(fd);
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return 0;
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}
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#endif
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