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Add args for UDP faking support.

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This commit is contained in:
Vadim Vetrov
2024-12-06 13:45:50 +03:00
parent 7480cd31b8
commit f9a51944dd
7 changed files with 324 additions and 80 deletions
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76
quic.c
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@@ -179,7 +179,7 @@ int udp_fail_packet(struct udp_failing_strategy strategy, uint8_t *payload, uint
set_ip_checksum(iph, iph_len);
if (strategy.strategy == FAKE_STRAT_UDP_CHECK) {
lgtrace_addp("break fake tcp checksum");
lgtrace_addp("break fake udp checksum");
udph->check += 1;
}
@@ -247,3 +247,77 @@ int gen_fake_udp(struct udp_fake_type type,
return 0;
}
int detect_udp_filtered(const struct section_config_t *section,
const uint8_t *payload, uint32_t plen) {
const void *iph;
uint32_t iph_len;
const struct udphdr *udph;
const uint8_t *data;
uint32_t dlen;
int ret;
int ipver;
ipver = netproto_version(payload, plen);
ret = udp_payload_split((uint8_t *)payload, plen,
(void **)&iph, &iph_len,
(struct udphdr **)&udph,
(uint8_t **)&data, &dlen);
int udp_dport = ntohs(udph->dest);
lgtrace_addp("UDP dport: %d", udp_dport);
if (ret < 0) {
goto skip;
}
if (section->udp_filter_quic) {
const struct quic_lhdr *qch;
uint32_t qch_len;
struct quic_cids qci;
uint8_t *quic_raw_payload;
uint32_t quic_raw_plen;
lgtrace_addp("QUIC probe");
ret = quic_parse_data((uint8_t *)data, dlen,
(struct quic_lhdr **)&qch, &qch_len, &qci,
&quic_raw_payload, &quic_raw_plen);
if (ret < 0) {
lgtrace_addp("undefined type");
goto skip;
}
lgtrace_addp("QUIC detected");
uint8_t qtype = qch->type;
goto approve;
// if (qch->version == QUIC_V1)
// qtype = quic_convtype_v1(qtype);
// else if (qch->version == QUIC_V2)
// qtype = quic_convtype_v2(qtype);
//
// if (qtype != QUIC_INITIAL_TYPE) {
// lgtrace_addp("quic message type: %d", qtype);
// goto accept_quic;
// }
//
// lgtrace_addp("quic initial message");
}
for (int i = 0; i < section->udp_dport_range_len; i++) {
struct udp_dport_range crange = section->udp_dport_range[i];
if (udp_dport >= crange.start && udp_dport <= crange.end) {
lgtrace_addp("matched to %d-%d", crange.start, crange.end);
goto approve;
}
}
skip:
return 0;
approve:
return 1;
}