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byedpi/desync.c
ruti ca03b1d311 Support TFO
2024-03-20 02:23:56 +03:00

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#include <stdio.h>
#include <string.h>
#ifndef _WIN32
#include <unistd.h>
#include <time.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/tcp.h>
#ifdef __linux__
#include <sys/mman.h>
#include <sys/sendfile.h>
#ifdef MFD_CLOEXEC
#include <sys/syscall.h>
#define memfd_create(name, flags) syscall(__NR_memfd_create, name, flags);
#else
#define memfd_create(name, flags) fileno(tmpfile())
#endif
#endif
#else
#include <winsock2.h>
#include <windows.h>
#include <ws2tcpip.h>
#include <mswsock.h>
#endif
#include <params.h>
#include <packets.h>
#include <error.h>
static inline int get_family(struct sockaddr *dst)
{
if (dst->sa_family == AF_INET6) {
struct sockaddr_in6 *d6 = (struct sockaddr_in6 *)dst;
static char *pat = "\0\0\0\0\0\0\0\0\0\0\xff\xff";
if (!memcmp(&d6->sin6_addr, pat, 12)) {
return AF_INET;
}
}
return dst->sa_family;
}
int setttl(int fd, int ttl, int family) {
int _ttl = ttl;
if (family == AF_INET) {
if (setsockopt(fd, IPPROTO_IP,
IP_TTL, (char *)&_ttl, sizeof(_ttl)) < 0) {
uniperror("setsockopt IP_TTL");
return -1;
}
}
else if (setsockopt(fd, IPPROTO_IPV6,
IPV6_UNICAST_HOPS, (char *)&_ttl, sizeof(_ttl)) < 0) {
uniperror("setsockopt IPV6_UNICAST_HOPS");
return -1;
}
return 0;
}
#ifndef _WIN32
static inline void delay(long ms)
{
struct timespec time = {
.tv_nsec = ms * 1e6
};
nanosleep(&time, 0);
}
#else
#define delay(ms) Sleep(ms)
#endif
#ifdef __linux__
int send_fake(int sfd, char *buffer,
int cnt, long pos, int fa, int ttl)
{
struct packet pkt = cnt != IS_HTTP ? fake_tls : fake_http;
size_t psz = pkt.size;
int ffd = memfd_create("name", O_RDWR);
if (ffd < 0) {
uniperror("memfd_create");
return -1;
}
char *p = 0;
int status = -1;
while (status) {
if (ftruncate(ffd, pos) < 0) {
uniperror("ftruncate");
break;
}
p = mmap(0, pos, PROT_WRITE, MAP_SHARED, ffd, 0);
if (p == MAP_FAILED) {
uniperror("mmap");
p = 0;
break;
}
memcpy(p, pkt.data, psz < pos ? psz : pos);
if (setttl(sfd, ttl, fa) < 0) {
break;
}
if (sendfile(sfd, ffd, 0, pos) < 0) {
uniperror("sendfile");
break;
}
delay(params.sfdelay);
memcpy(p, buffer, pos);
if (setttl(sfd, params.def_ttl, fa) < 0) {
break;
}
status = 0;
}
if (p) munmap(p, pos);
close(ffd);
return status;
}
#endif
#ifdef _WIN32
int send_fake(int sfd, char *buffer,
int cnt, long pos, int fa, int ttl)
{
struct packet pkt = cnt != IS_HTTP ? fake_tls : fake_http;
size_t psz = pkt.size;
char path[MAX_PATH + 1];
int ps = GetTempPath(sizeof(path), path);
if (!ps) {
uniperror("GetTempPath");
return -1;
}
if (!GetTempFileName(path, "t", 0, path)) {
uniperror("GetTempFileName");
return -1;
}
LOG(LOG_L, "temp file: %s\n", path);
HANDLE hfile = CreateFileA(path, GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
CREATE_ALWAYS, FILE_ATTRIBUTE_TEMPORARY | FILE_FLAG_DELETE_ON_CLOSE, NULL);
if (hfile == INVALID_HANDLE_VALUE) {
uniperror("CreateFileA");
return -1;
}
OVERLAPPED ov = {};
int status = -1;
while (status) {
ov.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
if (!ov.hEvent) {
uniperror("CreateEvent");
break;
}
if (!WriteFile(hfile, pkt.data, psz < pos ? psz : pos, 0, 0)) {
uniperror("WriteFile");
break;
}
if (psz < pos) {
if (SetFilePointer(hfile, pos, 0, FILE_BEGIN) == INVALID_SET_FILE_POINTER) {
uniperror("SetFilePointer");
break;
}
if (!SetEndOfFile(hfile)) {
uniperror("SetFileEnd");
break;
}
}
if (SetFilePointer(hfile, 0, 0, FILE_BEGIN) == INVALID_SET_FILE_POINTER) {
uniperror("SetFilePointer");
break;
}
if (setttl(sfd, ttl, fa) < 0) {
break;
}
if (!TransmitFile(sfd, hfile, pos, pos, &ov,
NULL, TF_USE_KERNEL_APC | TF_WRITE_BEHIND)) {
if ((GetLastError() != ERROR_IO_PENDING)
&& (WSAGetLastError() != WSA_IO_PENDING)) {
uniperror("TransmitFile");
break;
}
}
delay(params.sfdelay);
if (SetFilePointer(hfile, 0, 0, FILE_BEGIN) == INVALID_SET_FILE_POINTER) {
uniperror("SetFilePointer");
break;
}
if (!WriteFile(hfile, buffer, pos, 0, 0)) {
uniperror("WriteFile");
break;
}
if (setttl(sfd, params.def_ttl, fa) < 0) {
break;
}
status = 0;
}
if (!CloseHandle(hfile)) {
uniperror("CloseHandle hfile");
}
if (ov.hEvent && !CloseHandle(ov.hEvent)) {
uniperror("CloseHandle hEvent");
}
return status;
}
#endif
int send_oob(int sfd, char *buffer,
ssize_t n, long pos)
{
ssize_t size = oob_data.size - 1;
char *data = oob_data.data + 1;
char rchar = buffer[pos];
buffer[pos] = oob_data.data[0];
if (send(sfd, buffer, pos + 1, MSG_OOB) < 0) {
uniperror("send");
buffer[pos] = rchar;
return -1;
}
buffer[pos] = rchar;
if (size) {
delay(params.sfdelay);
}
for (long i = 0; i < size; i++) {
if (send(sfd, data + i, 1, MSG_OOB) < 0) {
uniperror("send");
return -1;
}
if (size != 1) {
delay(params.sfdelay);
}
}
return 0;
}
int send_disorder(int sfd,
char *buffer, long pos, int fa)
{
int bttl = 1;
int status = 0;
if (setttl(sfd, bttl, fa) < 0) {
return -1;
}
if (send(sfd, buffer, pos, 0) < 0) {
uniperror("send");
status = -1;
}
if (setttl(sfd, params.def_ttl, fa) < 0) {
return -1;
}
return status;
}
int desync(int sfd, char *buffer, size_t bfsize,
ssize_t n, ssize_t offset, struct sockaddr *dst, int dp_c)
{
struct desync_params dp = params.dp[dp_c];
char *host = 0;
int len = 0, type = 0;
int fa = get_family(dst);
if ((len = parse_tls(buffer, n, &host))) {
type = IS_HTTPS;
}
else if ((len = parse_http(buffer, n, &host, 0))) {
type = IS_HTTP;
}
if (len && host) {
LOG(LOG_S, "host: %.*s (%ld)\n",
len, host, host - buffer);
}
if (type == IS_HTTP && dp.mod_http) {
LOG(LOG_S, "modify HTTP: n=%ld\n", n);
if (mod_http(buffer, n, dp.mod_http)) {
LOG(LOG_E, "mod http error\n");
return -1;
}
}
else if (type == IS_HTTPS && dp.tlsrec_n) {
long lp = 0;
for (int i = 0; i < dp.tlsrec_n; i++) {
struct part part = dp.tlsrec[i];
long pos = part.pos + i * 5;
if (part.flag == OFFSET_SNI) {
pos += (host - buffer - 5);
}
else if (pos < 0) {
pos += n;
}
if (pos < lp) {
LOG(LOG_E, "tlsrec cancel: %ld < %ld\n", pos, lp);
break;
}
if (!part_tls(buffer + lp,
bfsize - lp, n - lp, pos - lp)) {
LOG(LOG_E, "tlsrec error: pos=%ld, n=%ld\n", pos, n);
break;
}
LOG(LOG_S, "tlsrec: pos=%ld, n=%ld\n", pos, n);
n += 5;
lp = pos + 5;
}
}
if (params.custom_ttl) {
if (setttl(sfd, params.def_ttl, fa) < 0) {
return -1;
}
}
long lp = offset;
if (!type && params.de_known) {
}
else for (int i = 0; i < dp.parts_n; i++) {
struct part part = dp.parts[i];
long pos = part.pos;
if (part.flag == OFFSET_SNI) {
if (type != IS_HTTPS)
continue;
else
pos += (host - buffer);
}
else if (part.flag == OFFSET_HOST) {
if (type != IS_HTTP)
continue;
else
pos += (host - buffer);
}
else if (pos < 0) {
pos += n;
}
// after EAGAIN
if (pos <= offset) {
continue;
}
else if (pos <= 0 || pos >= n || pos <= lp) {
LOG(LOG_E, "split cancel: pos=%ld-%ld, n=%ld\n", lp, pos, n);
break;
}
LOG(LOG_S, "split: pos=%ld-%ld, m=%d\n", lp, pos, part.m);
int s = 0;
switch (part.m) {
#ifdef FAKE_SUPPORT
case DESYNC_FAKE:
s = send_fake(sfd,
buffer + lp, type, pos - lp, fa, dp.ttl ? dp.ttl : 8);
break;
#endif
case DESYNC_DISORDER:
s = send_disorder(sfd,
buffer + lp, pos - lp, fa);
break;
case DESYNC_OOB:
s = send_oob(sfd,
buffer + lp, n - lp, pos - lp);
break;
case DESYNC_SPLIT:
default:
s = send(sfd, buffer + lp, pos - lp, 0);
}
if (s < 0) {
if (part.m != DESYNC_FAKE
&& get_e() == EAGAIN) {
return lp;
}
return -1;
}
lp = pos;
}
if (lp < n) {
LOG((lp ? LOG_S : LOG_L), "send: pos=%ld-%ld\n", lp, n);
if (send(sfd, buffer + lp, n - lp, 0) < 0) {
if (get_e() == EAGAIN) {
return lp;
}
uniperror("send");
return -1;
}
}
return n;
}
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