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Fix ip-opt if dst address is IPv6 (again)

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93587ce
This commit is contained in:
ruti 2024-11-19 21:28:23 +03:00
parent 649ec06a85
commit 1ed00ea6d9
1 changed files with 24 additions and 12 deletions
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36
desync.c
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@ -32,6 +32,7 @@
#include "error.h"
#define WAIT_LIMIT_MS 500
#define DEFAULT_TTL 8
int setttl(int fd, int ttl)
@ -48,7 +49,19 @@ int setttl(int fd, int ttl)
return 0;
}
#ifdef __linux__
static int get_family(const struct sockaddr_in6 *dst)
{
static const char map[12] = "\0\0\0\0\0\0\0\0\0\0\xff\xff";
if (dst->sin6_family == AF_INET6
&& !memcmp(&dst->sin6_addr, map, sizeof(map))) {
return AF_INET;
}
return dst->sin6_family;
}
static int drop_sack(int fd)
{
struct sock_filter code[] = {
@ -71,10 +84,8 @@ static int drop_sack(int fd)
}
return 0;
}
#endif
#ifndef _WIN32
static inline void delay(long ms)
{
struct timespec time = {
@ -82,9 +93,8 @@ static inline void delay(long ms)
};
nanosleep(&time, 0);
}
#endif
#ifdef __linux__
static void wait_send_if_support(int sfd)
{
int i = 0;
@ -117,6 +127,7 @@ static void wait_send_if_support(int sfd)
#define wait_send_if_support(sfd)
#endif
static struct packet get_tcp_fake(const char *buffer, size_t n,
struct proto_info *info, const struct desync_params *opt)
{
@ -148,7 +159,8 @@ static ssize_t send_fake(int sfd, const char *buffer,
{
struct sockaddr_in6 addr = {};
socklen_t addr_size = sizeof(addr);
if (opt->md5sig) {
if (opt->md5sig || opt->ip_options) {
if (getpeername(sfd,
(struct sockaddr *)&addr, &addr_size) < 0) {
uniperror("getpeername");
@ -172,7 +184,7 @@ static ssize_t send_fake(int sfd, const char *buffer,
}
memcpy(p, pkt.data, pkt.size < pos ? pkt.size : pos);
if (setttl(sfd, opt->ttl ? opt->ttl : 8) < 0) {
if (setttl(sfd, opt->ttl ? opt->ttl : DEFAULT_TTL) < 0) {
break;
}
if (opt->md5sig) {
@ -187,11 +199,11 @@ static ssize_t send_fake(int sfd, const char *buffer,
break;
}
}
if (opt->ip_options
if (opt->ip_options && get_family(&addr) == AF_INET
&& setsockopt(sfd, IPPROTO_IP, IP_OPTIONS,
opt->ip_options, opt->ip_options_len) < 0) {
uniperror("setsockopt IP_OPTIONS");
//break;
break;
}
struct iovec vec = { .iov_base = p, .iov_len = pos };
@ -211,11 +223,11 @@ static ssize_t send_fake(int sfd, const char *buffer,
if (setttl(sfd, params.def_ttl) < 0) {
break;
}
if (opt->ip_options
if (opt->ip_options && get_family(&addr) == AF_INET
&& setsockopt(sfd, IPPROTO_IP,
IP_OPTIONS, opt->ip_options, 0) < 0) {
uniperror("setsockopt IP_OPTIONS");
//break;
break;
}
if (opt->md5sig) {
struct tcp_md5sig md5 = {
@ -290,7 +302,7 @@ static ssize_t send_fake(int sfd, const char *buffer,
uniperror("SetFilePointer");
break;
}
if (setttl(sfd, opt->ttl ? opt->ttl : 8) < 0) {
if (setttl(sfd, opt->ttl ? opt->ttl : DEFAULT_TTL) < 0) {
break;
}
if (!TransmitFile(sfd, hfile, pos, pos, &ov,
@ -626,7 +638,7 @@ ssize_t desync_udp(int sfd, char *buffer, size_t bfsize,
}
else pkt.size = 0;
}
int bttl = dp->ttl ? dp->ttl : 8;
int bttl = dp->ttl ? dp->ttl : DEFAULT_TTL;
if (setttl(sfd, bttl) < 0) {
return -1;
}