openingd/openingd.c: Fix a mild deviation from BOLT#2.
Fixes: #3815 Changelog-Fixed: Fixed a deviation from BOLT#2: if both nodes advertised `option_upfront_shutdown_script` feature: MUST include ... a zero-length `shutdown_scriptpubkey`.
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@ -119,7 +119,7 @@ struct state {
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struct feature_set *our_features;
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};
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static u8 *dev_upfront_shutdown_script(const tal_t *ctx)
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static u8 *no_upfront_shutdown_script(const tal_t *ctx, struct state *state)
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{
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#if DEVELOPER
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/* This is a hack, for feature testing */
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@ -127,6 +127,20 @@ static u8 *dev_upfront_shutdown_script(const tal_t *ctx)
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if (e)
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return tal_hexdata(ctx, e, strlen(e));
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#endif
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/* BOLT #2:
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*
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* - if both nodes advertised the `option_upfront_shutdown_script`
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* feature:
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* - MUST include `upfront_shutdown_script` with either a valid
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* `shutdown_scriptpubkey` as required by `shutdown`
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* `scriptpubkey`, or a zero-length `shutdown_scriptpubkey`
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* (ie. `0x0000`).
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*/
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if (feature_negotiated(state->our_features, state->their_features,
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OPT_UPFRONT_SHUTDOWN_SCRIPT))
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return tal_arr(ctx, u8, 0);
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return NULL;
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}
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@ -522,17 +536,8 @@ static u8 *funder_channel_start(struct state *state, u8 channel_flags)
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if (!setup_channel_funder(state))
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return NULL;
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/* BOLT #2:
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*
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* - if both nodes advertised the `option_upfront_shutdown_script`
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* feature:
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* - MUST include `upfront_shutdown_script` with either a valid
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* `shutdown_scriptpubkey` as required by `shutdown`
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* `scriptpubkey`, or a zero-length `shutdown_scriptpubkey`
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* (ie. `0x0000`).
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*/
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if (!state->upfront_shutdown_script[LOCAL])
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state->upfront_shutdown_script[LOCAL] = dev_upfront_shutdown_script(state);
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state->upfront_shutdown_script[LOCAL] = no_upfront_shutdown_script(state, state);
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open_tlvs = tlv_open_channel_tlvs_new(tmpctx);
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open_tlvs->upfront_shutdown_script
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@ -1092,7 +1097,7 @@ static u8 *fundee_channel(struct state *state, const u8 *open_channel_msg)
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}
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if (!state->upfront_shutdown_script[LOCAL])
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state->upfront_shutdown_script[LOCAL] = dev_upfront_shutdown_script(state);
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state->upfront_shutdown_script[LOCAL] = no_upfront_shutdown_script(state, state);
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/* OK, we accept! */
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accept_tlvs = tlv_accept_channel_tlvs_new(tmpctx);
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