63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
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#include "features.h"
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#include <wire/peer_wire.h>
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static const u8 supported_local_features[]
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= {LOCALFEATURES_INITIAL_ROUTING_SYNC};
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static const u8 supported_global_features[]
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= {};
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u8 *get_supported_global_features(const tal_t *ctx)
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{
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return tal_dup_arr(ctx, u8, supported_global_features,
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sizeof(supported_global_features), 0);
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}
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u8 *get_supported_local_features(const tal_t *ctx)
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{
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return tal_dup_arr(ctx, u8, supported_local_features,
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sizeof(supported_local_features), 0);
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}
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/**
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* requires_unsupported_features - Check if we support what's being asked
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*
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* Given the features vector that the remote connection is expecting
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* from us, we check to see if we support all even bit features, i.e.,
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* the required features. We do so by subtracting our own features in
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* the provided positions and see if even bits remain.
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*
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* @bitmap: the features bitmap the peer is asking for
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* @supportmap: what do we support
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* @smlen: how long is our supportmap
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*/
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static bool requires_unsupported_features(const u8 *bitmap,
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const u8 *supportmap,
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size_t smlen)
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{
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size_t len = tal_count(bitmap);
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u8 support;
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for (size_t i=0; i<len; i++) {
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/* Find matching bitmap byte in supportmap, 0x00 if none */
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if (len > smlen) {
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support = 0x00;
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} else {
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support = supportmap[smlen-1];
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}
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/* Cancel out supported bits, check for even bits */
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if ((~support & bitmap[i]) & 0x55)
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return true;
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}
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return false;
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}
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bool unsupported_features(const u8 *gfeatures, const u8 *lfeatures)
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{
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return requires_unsupported_features(gfeatures,
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supported_global_features,
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sizeof(supported_global_features))
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|| requires_unsupported_features(lfeatures,
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supported_local_features,
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sizeof(supported_local_features));
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}
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