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common: implement decoding of query-flags for query_short_channel_ids.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2019-08-10 01:36:01 +09:30
parent d2030539e1
commit e7728c0eea
2 changed files with 75 additions and 0 deletions
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45
common/decode_short_channel_ids.c
View File

@ -1,5 +1,7 @@
#include <ccan/cast/cast.h>
#include <common/decode_short_channel_ids.h>
#include <common/utils.h>
#include <wire/gen_peer_wire.h>
#include <wire/wire.h>
#include <zlib.h>
@ -60,3 +62,46 @@ struct short_channel_id *decode_short_ids(const tal_t *ctx, const u8 *encoded)
}
return NULL;
}
#if EXPERIMENTAL_FEATURES
bigsize_t *decode_scid_query_flags(const tal_t *ctx,
const struct tlv_query_short_channel_ids_tlvs_query_flags *qf)
{
u8 *encoded = qf->encoded_query_flags;
size_t max = tal_count(encoded);
bigsize_t *flags;
/* BOLT-61a1365a45cc8b463ddbbe3429d350f8eac787dd #7:
*
* The receiver:
*...
* - if the incoming message includes `query_short_channel_ids_tlvs`:
* - if `encoding_type` is not a known encoding type:
* - MAY fail the connection
* - if `encoded_query_flags` does not decode to exactly one flag per
* `short_channel_id`:
* - MAY fail the connection.
*/
switch (qf->encoding_type) {
case SHORTIDS_ZLIB:
encoded = unzlib(tmpctx, encoded, max);
if (!encoded)
return NULL;
max = tal_count(encoded);
/* fall thru */
case SHORTIDS_UNCOMPRESSED:
flags = tal_arr(ctx, bigsize_t, 0);
while (max)
tal_arr_expand(&flags,
fromwire_bigsize(cast_const2(const u8 **,
&encoded),
&max));
/* encoded is set to NULL if we ran over */
if (!encoded)
return tal_free(flags);
return flags;
}
return NULL;
}
#endif /* EXPERIMENTAL_FEATURES */

30
common/decode_short_channel_ids.h
View File

@ -3,6 +3,9 @@
#include "config.h"
#include <ccan/short_types/short_types.h>
#include <ccan/tal/tal.h>
#include <common/bigsize.h>
struct tlv_query_short_channel_ids_tlvs_query_flags;
/* BOLT #7:
*
@ -16,4 +19,31 @@ enum scid_encode_types {
};
struct short_channel_id *decode_short_ids(const tal_t *ctx, const u8 *encoded);
/* BOLT-61a1365a45cc8b463ddbbe3429d350f8eac787dd #7:
*
* `encoded_query_flags` is an array of bitfields, one varint per bitfield,
* one bitfield for each `short_channel_id`. Bits have the following meaning:
*
* | Bit Position | Meaning |
* | ------------- | ---------------------------------------- |
* | 0 | Sender wants `channel_announcement` |
* | 1 | Sender wants `channel_update` for node 1 |
* | 2 | Sender wants `channel_update` for node 2 |
* | 3 | Sender wants `node_announcement` for node 1 |
* | 4 | Sender wants `node_announcement` for node 2 |
*/
enum scid_query_flag {
SCID_QF_ANNOUNCE = 0x1,
SCID_QF_UPDATE1 = 0x2,
SCID_QF_UPDATE2 = 0x4,
SCID_QF_NODE1 = 0x8,
SCID_QF_NODE2 = 0x10,
};
#if EXPERIMENTAL_FEATURES
bigsize_t *decode_scid_query_flags(const tal_t *ctx,
const struct tlv_query_short_channel_ids_tlvs_query_flags *qf);
#endif /* EXPERIMENTAL_FEATURES */
#endif /* LIGHTNING_COMMON_DECODE_SHORT_CHANNEL_IDS_H */