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Skeleton for quic initial message parser

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Vadim Vetrov
2024-08-13 01:59:47 +03:00
parent d5db8c18e5
commit 4a8f0d18a9
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#ifndef QUIC_H
#define QUIC_H
#include "types.h"
/**
* @macro
*
* :macro:`NGTCP2_INITIAL_SALT_V1` is a salt value which is used to
* derive initial secret. It is used for QUIC v1.
*/
#define QUIC_INITIAL_SALT_V1 \
"\x38\x76\x2c\xf7\xf5\x59\x34\xb3\x4d\x17\x9a\xe6\xa4\xc8\x0c\xad" \
"\xcc\xbb\x7f\x0a"
/**
* @macro
*
* :macro:`NGTCP2_INITIAL_SALT_V2` is a salt value which is used to
* derive initial secret. It is used for QUIC v2.
*/
#define QUIC_INITIAL_SALT_V2 \
"\x0d\xed\xe3\xde\xf7\x00\xa6\xdb\x81\x93\x81\xbe\x6e\x26\x9d\xcb" \
"\xf9\xbd\x2e\xd9"
#define QUIC_INITIAL_TYPE_V1 0x00
#define QUIC_0_RTT_TYPE_V1 0x01
#define QUIC_HANDSHAKE_TYPE_V1 0x02
#define QUIC_RETRY_TYPE_V1 0x03
#define QUIC_INITIAL_TYPE_V2 0b01
#define QUIC_0_RTT_TYPE_V2 0b10
#define QUIC_HANDSHAKE_TYPE_V2 0b11
#define QUIC_RETRY_TYPE_V2 0b00
/**
* Quic Large Header
*/
struct quic_lhdr {
#if __BYTE_ORDER == __LITTLE_ENDIAN
uint8_t number_length: 2;
uint8_t reserved: 2;
uint8_t type: 2;
uint8_t fixed: 1;
uint8_t form: 1;
#elif __BYTE_ORDER == __BIG_ENDIAN
uint8_t form: 1;
uint8_t fixed: 1;
uint8_t type: 2;
uint8_t reserved: 2;
uint8_t number_length: 2;
#else
#error "Undefined endian"
#endif
uint32_t version;
};
/**
* Quic Large Header Ids
* (separated from the original header because of varying dst
*/
struct quic_cids {
uint8_t dst_len;
uint8_t *dst_id;
uint8_t src_len;
uint8_t *src_id;
};
/**
* Parses QUIС raw data (UDP payload) to quic large header and
* quic payload.
*
* \qch_len is sizeof(qch) + qci->dst_len + qci->src_id
* \payload is Type-Specific payload (#17.2).
*/
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);
/**
* Parses QUIC variable-length integer. (#16)
* \variable is a pointer to the sequence to be parsed
* (varlen integer in big endian format)
*
* \mlen Used to signal about variable length and validate left length
* in the buffer.
*/
uint64_t quic_parse_varlength(uint8_t *variable, uint64_t *mlen);
// quici stands for QUIC Initial
/**
* This structure should be parsed
*/
struct quici_hdr {
uint64_t token_len;
uint8_t *token;
uint64_t length;
uint32_t packet_number;
};
/**
* Parses QUIC initial payload.
* \inpayload is a raw QUIC payload (payload after quic large header)
*/
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);
#endif /* QUIC_H */