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Allow to select synfake length

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This commit is contained in:
Vadim Vetrov
2024-08-29 15:49:01 +03:00
parent 0f71d5f3c4
commit 3d9481d72d
4 changed files with 31 additions and 5 deletions
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19
mangle.c
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@@ -94,25 +94,36 @@ int process_tcp_packet(const uint8_t *raw_payload, uint32_t raw_payload_len) {
uint8_t payload[MAX_PACKET_SIZE];
memcpy(payload, ipxh, iph_len);
memcpy(payload + iph_len, tcph, tcph_len);
memcpy(payload + iph_len + tcph_len, config.fake_sni_pkt, config.fake_sni_pkt_sz);
uint32_t fake_len = config.fake_sni_pkt_sz;
if (config.synfake_len)
fake_len = min(config.synfake_len, fake_len);
memcpy(payload + iph_len + tcph_len, config.fake_sni_pkt, fake_len);
struct tcphdr *tcph = (struct tcphdr *)(payload + iph_len);
if (ipxv == IP4VERSION) {
struct iphdr *iph = (struct iphdr *)payload;
iph->tot_len = htons(iph_len + tcph_len + config.fake_sni_pkt_sz);
iph->tot_len = htons(iph_len + tcph_len + fake_len);
set_ip_checksum(payload, iph_len);
set_tcp_checksum(tcph, iph, iph_len);
} else if (ipxv == IP6VERSION) {
struct ip6_hdr *ip6h = (struct ip6_hdr *)payload;
ip6h->ip6_ctlun.ip6_un1.ip6_un1_plen = ntohs(tcph_len + config.fake_sni_pkt_sz);
ip6h->ip6_ctlun.ip6_un1.ip6_un1_plen =
ntohs(tcph_len + fake_len);
set_ip_checksum(ip6h, iph_len);
set_tcp_checksum(tcph, ip6h, iph_len);
}
instance_config.send_raw_packet(payload, iph_len + tcph_len + config.fake_sni_pkt_sz);
ret = instance_config.send_raw_packet(payload, iph_len + tcph_len + fake_len);
if (ret < 0) {
lgerror("send_syn_altered", ret);
goto accept;
}
lgtrace_addp("rawsocket sent %d", ret);
goto drop;
}