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107 lines
2.8 KiB
107 lines
2.8 KiB
#include <ccan/cast/cast.h>
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#include <common/decode_short_channel_ids.h>
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#include <common/utils.h>
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#include <wire/gen_peer_wire.h>
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#include <wire/wire.h>
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#include <zlib.h>
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static u8 *unzlib(const tal_t *ctx, const u8 *encoded, size_t len)
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{
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/* http://www.zlib.net/zlib_tech.html gives 1032:1 as worst-case,
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* which is 67632120 bytes for us. But they're not encoding zeroes,
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* and each scid must be unique. So 1MB is far more reasonable. */
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unsigned long unclen = 1024*1024;
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int zerr;
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u8 *unc = tal_arr(ctx, u8, unclen);
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zerr = uncompress(unc, &unclen, encoded, len);
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if (zerr != Z_OK)
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return tal_free(unc);
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/* Truncate and return. */
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tal_resize(&unc, unclen);
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return unc;
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}
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struct short_channel_id *decode_short_ids(const tal_t *ctx, const u8 *encoded)
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{
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struct short_channel_id *scids;
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size_t max = tal_count(encoded);
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enum scid_encode_types type;
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/* BOLT #7:
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*
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* The receiver:
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* - if the first byte of `encoded_short_ids` is not a known encoding
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* type:
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* - MAY fail the connection
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* - if `encoded_short_ids` does not decode into a whole number of
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* `short_channel_id`:
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* - MAY fail the connection
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*/
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type = fromwire_u8(&encoded, &max);
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switch (type) {
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case SHORTIDS_ZLIB:
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encoded = unzlib(tmpctx, encoded, max);
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if (!encoded)
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return NULL;
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max = tal_count(encoded);
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/* fall thru */
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case SHORTIDS_UNCOMPRESSED:
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scids = tal_arr(ctx, struct short_channel_id, 0);
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while (max) {
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struct short_channel_id scid;
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fromwire_short_channel_id(&encoded, &max, &scid);
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tal_arr_expand(&scids, scid);
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}
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/* encoded is set to NULL if we ran over */
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if (!encoded)
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return tal_free(scids);
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return scids;
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}
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return NULL;
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}
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#if EXPERIMENTAL_FEATURES
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bigsize_t *decode_scid_query_flags(const tal_t *ctx,
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const struct tlv_query_short_channel_ids_tlvs_query_flags *qf)
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{
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u8 *encoded = qf->encoded_query_flags;
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size_t max = tal_count(encoded);
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bigsize_t *flags;
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/* BOLT-61a1365a45cc8b463ddbbe3429d350f8eac787dd #7:
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*
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* The receiver:
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*...
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* - if the incoming message includes `query_short_channel_ids_tlvs`:
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* - if `encoding_type` is not a known encoding type:
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* - MAY fail the connection
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* - if `encoded_query_flags` does not decode to exactly one flag per
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* `short_channel_id`:
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* - MAY fail the connection.
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*/
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switch (qf->encoding_type) {
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case SHORTIDS_ZLIB:
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encoded = unzlib(tmpctx, encoded, max);
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if (!encoded)
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return NULL;
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max = tal_count(encoded);
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/* fall thru */
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case SHORTIDS_UNCOMPRESSED:
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flags = tal_arr(ctx, bigsize_t, 0);
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while (max)
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tal_arr_expand(&flags,
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fromwire_bigsize(cast_const2(const u8 **,
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&encoded),
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&max));
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/* encoded is set to NULL if we ran over */
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if (!encoded)
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return tal_free(flags);
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return flags;
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}
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return NULL;
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}
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#endif /* EXPERIMENTAL_FEATURES */
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