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prop224: Parse INTRODUCE_ACK cell

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Add a function to parse an INTRODUCE_ACK cell in hs_cell.c. Furthermore, add
an enum that lists all possible expected status code.

Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit is contained in:
David Goulet 2017-07-21 17:06:04 -04:00
parent e7c06e6947
commit cb336a7062
2 changed files with 32 additions and 0 deletions
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23
src/or/hs_cell.c
View File

@ -864,3 +864,26 @@ hs_cell_build_establish_rendezvous(const uint8_t *rendezvous_cookie,
return HS_REND_COOKIE_LEN;
}
/* Handle an INTRODUCE_ACK cell encoded in payload of length payload_len.
* Return the status code on success else a negative value if the cell as not
* decodable. */
int
hs_cell_parse_introduce_ack(const uint8_t *payload, size_t payload_len)
{
int ret = -1;
trn_cell_introduce_ack_t *cell = NULL;
tor_assert(payload);
if (trn_cell_introduce_ack_parse(&cell, payload, payload_len) < 0) {
log_info(LD_REND, "Invalid INTRODUCE_ACK cell. Unable to parse it.");
goto end;
}
ret = trn_cell_introduce_ack_get_status(cell);
end:
trn_cell_introduce_ack_free(cell);
return ret;
}

9
src/or/hs_cell.h
View File

@ -16,6 +16,14 @@
* 3.2.2 of the specification). Below this value, the cell must be padded. */
#define HS_CELL_INTRODUCE1_MIN_SIZE 246
/* Status code of an INTRODUCE_ACK cell. */
typedef enum {
HS_CELL_INTRO_ACK_SUCCESS = 0x0000, /* Cell relayed to service. */
HS_CELL_INTRO_ACK_FAILURE = 0x0001, /* Service ID not recognized */
HS_CELL_INTRO_ACK_BADFMT = 0x0002, /* Bad message format */
HS_CELL_INTRO_ACK_NORELAY = 0x0003, /* Can't relay cell to service */
} hs_cell_introd_ack_status_t;
/* Onion key type found in the INTRODUCE1 cell. */
typedef enum {
HS_CELL_ONION_KEY_TYPE_NTOR = 1,
@ -102,6 +110,7 @@ ssize_t hs_cell_parse_intro_established(const uint8_t *payload,
ssize_t hs_cell_parse_introduce2(hs_cell_introduce2_data_t *data,
const origin_circuit_t *circ,
const hs_service_t *service);
int hs_cell_parse_introduce_ack(const uint8_t *payload, size_t payload_len);
#endif /* TOR_HS_CELL_H */