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gossipd: fix response for large replies.

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We tried to send an absurdly-long message, because our limit
was really large, as we were subtracting the tlv length, not
the tlv overhead.

In addition, we were treating the array as a tal object, which
it isn't if the offset is non-zero.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2020-11-10 14:06:49 +10:30 • committed by neil saitug
parent 6b347e1895
commit 50f8da85ac
1 changed files with 13 additions and 9 deletions
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22
gossipd/queries.c
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@ -348,8 +348,8 @@ const u8 *handle_query_short_channel_ids(struct peer *peer, const u8 *msg)
static void send_reply_channel_range(struct peer *peer,
u32 first_blocknum, u32 number_of_blocks,
const struct short_channel_id *scids,
struct channel_update_timestamps *tstamps,
struct channel_update_checksums *csums,
const struct channel_update_timestamps *tstamps,
const struct channel_update_checksums *csums,
size_t num_scids)
{
/* BOLT #7:
@ -386,7 +386,11 @@ static void send_reply_channel_range(struct peer *peer,
= tal_steal(tlvs, encoded_timestamps);
}
tlvs->checksums_tlv = csums;
/* Must be a tal object! */
if (csums)
tlvs->checksums_tlv = tal_dup_arr(tlvs,
struct channel_update_checksums,
csums, num_scids, 0);
u8 *msg = towire_reply_channel_range(NULL,
&chainparams->genesis_blockhash,
@ -434,9 +438,9 @@ static void get_checksum_and_timestamp(struct routing_state *rstate,
}
/* FIXME: This assumes that the tlv type encodes into 1 byte! */
static size_t tlv_len(size_t num_entries, size_t size)
static size_t tlv_overhead(size_t num_entries, size_t size)
{
return 1 + bigsize_len(num_entries * size) + num_entries * size;
return 1 + bigsize_len(num_entries * size);
}
/* How many entries can I fit in a reply? */
@ -464,14 +468,14 @@ static size_t max_entries(enum query_option_flags query_option_flags)
/* If we add timestamps, we need to encode tlv */
if (query_option_flags & QUERY_ADD_TIMESTAMPS) {
max_encoded_bytes -= tlv_len(max_num,
sizeof(struct channel_update_timestamps));
max_encoded_bytes -= tlv_overhead(max_num,
sizeof(struct channel_update_timestamps));
per_entry_size += sizeof(struct channel_update_timestamps);
}
if (query_option_flags & QUERY_ADD_CHECKSUMS) {
max_encoded_bytes -= tlv_len(max_num,
sizeof(struct channel_update_checksums));
max_encoded_bytes -= tlv_overhead(max_num,
sizeof(struct channel_update_checksums));
per_entry_size += sizeof(struct channel_update_checksums);
}