mirror of
https://github.com/Waujito/youtubeUnblock.git
synced 2024-12-22 06:15:31 +00:00
ef120ca100
Add syslog for daemonize. This allows to log not only to the standard output but also in system log
141 lines
3.0 KiB
C
141 lines
3.0 KiB
C
#include "quic.h"
|
|
#include "logging.h"
|
|
|
|
|
|
/**
|
|
* Packet number.
|
|
*/
|
|
struct quic_pnumber {
|
|
uint8_t d1;
|
|
uint8_t d2;
|
|
uint8_t d3;
|
|
uint8_t d4;
|
|
};
|
|
|
|
uint64_t quic_parse_varlength(uint8_t *variable, uint64_t *mlen) {
|
|
if (mlen && *mlen == 0) return 0;
|
|
uint64_t vr = (*variable & 0x3F);
|
|
uint8_t len = 1 << (*variable >> 6);
|
|
|
|
if (mlen) {
|
|
if (*mlen < len) return 0;
|
|
*mlen = len;
|
|
}
|
|
|
|
++variable;
|
|
for (uint8_t i = 1; i < len; i++) {
|
|
vr = (vr << 8) + *variable;
|
|
++variable;
|
|
}
|
|
|
|
return vr;
|
|
}
|
|
|
|
int quic_parse_data(uint8_t *raw_payload, uint32_t raw_payload_len,
|
|
struct quic_lhdr **qch, uint32_t *qch_len,
|
|
struct quic_cids *qci,
|
|
uint8_t **payload, uint32_t *plen) {
|
|
if ( raw_payload == NULL ||
|
|
raw_payload_len < sizeof(struct quic_lhdr))
|
|
goto invalid_packet;
|
|
|
|
struct quic_lhdr *nqch = (struct quic_lhdr *)raw_payload;
|
|
uint32_t left_len = raw_payload_len - sizeof(struct quic_lhdr);
|
|
uint8_t *cur_rawptr = raw_payload + sizeof(struct quic_lhdr);
|
|
if (!nqch->fixed) {
|
|
lgtrace_addp("quic fixed uset");
|
|
return -EPROTO;
|
|
}
|
|
|
|
uint8_t found = 0;
|
|
for (uint8_t i = 0; i < 2; i++) {
|
|
if (ntohl(nqch->version) == supported_versions[i]) {
|
|
found = 1;
|
|
}
|
|
}
|
|
|
|
if (!found) {
|
|
lgtrace_addp("quic version undefined %d", ntohl(nqch->version));
|
|
return -EPROTO;
|
|
}
|
|
|
|
lgtrace_addp("quic version valid %d", ntohl(nqch->version));
|
|
|
|
if (left_len < 2) goto invalid_packet;
|
|
struct quic_cids nqci = {0};
|
|
|
|
nqci.dst_len = *cur_rawptr++;
|
|
left_len--;
|
|
if (left_len < nqci.dst_len) goto invalid_packet;
|
|
nqci.dst_id = cur_rawptr;
|
|
cur_rawptr += nqci.dst_len;
|
|
left_len -= nqci.dst_len;
|
|
|
|
nqci.src_len = *cur_rawptr++;
|
|
left_len--;
|
|
if (left_len < nqci.src_len) goto invalid_packet;
|
|
nqci.src_id = cur_rawptr;
|
|
cur_rawptr += nqci.src_len;
|
|
left_len -= nqci.src_len;
|
|
|
|
if (qch) *qch = nqch;
|
|
if (qch_len) {
|
|
*qch_len = sizeof(struct quic_lhdr) +
|
|
nqci.src_len + nqci.dst_len;
|
|
}
|
|
if (qci) *qci = nqci;
|
|
if (payload) *payload = cur_rawptr;
|
|
if (plen) *plen = left_len;
|
|
|
|
return 0;
|
|
|
|
invalid_packet:
|
|
return -EINVAL;
|
|
}
|
|
|
|
int quic_parse_initial_message(uint8_t *inpayload, uint32_t inplen,
|
|
const struct quic_lhdr *qch,
|
|
struct quici_hdr *qhdr,
|
|
uint8_t **payload, uint32_t *plen) {
|
|
if (inplen < 3) goto invalid_packet;
|
|
struct quici_hdr nqhdr;
|
|
|
|
uint8_t *cur_ptr = inpayload;
|
|
uint32_t left_len = inplen;
|
|
uint64_t tlen = left_len;
|
|
|
|
nqhdr.token_len = quic_parse_varlength(cur_ptr, &tlen);
|
|
nqhdr.token = cur_ptr + tlen;
|
|
|
|
if (left_len < nqhdr.token_len + tlen)
|
|
goto invalid_packet;
|
|
cur_ptr += tlen + nqhdr.token_len;
|
|
left_len -= tlen + nqhdr.token_len;
|
|
|
|
tlen = left_len;
|
|
nqhdr.length = quic_parse_varlength(cur_ptr, &tlen);
|
|
|
|
if (left_len != nqhdr.length + tlen &&
|
|
left_len <= qch->number_length + 1)
|
|
goto invalid_packet;
|
|
|
|
uint32_t packet_number = 0;
|
|
|
|
for (uint8_t i = 0; i <= qch->number_length; i++) {
|
|
packet_number = (packet_number << 8) + *cur_ptr++;
|
|
left_len--;
|
|
}
|
|
|
|
nqhdr.packet_number = packet_number;
|
|
|
|
if (qhdr) *qhdr = nqhdr;
|
|
if (payload) *payload = cur_ptr;
|
|
if (plen) *plen = left_len;
|
|
|
|
return 0;
|
|
|
|
invalid_packet:
|
|
lgerror(-EINVAL, "QUIC invalid Initial packet");
|
|
return -EINVAL;
|
|
}
|