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plugins/libplugin-pay.c: Properly handle exclusions for routehints with two hops or more.

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Arguably a low-priority bug since no current node ever generates routehints longer
than one hop.

However, it is possible as an edge case, if the destination is directly accessible
*and* supports multiple channels, that we route through the destination, one of the
*other* channels it has not in the routehint, to the entry point, and then through
the routehint.

This change removes the risk of the above edge case.

Changelog-None: arguably a low-priority bug.
This commit is contained in:
ZmnSCPxj jxPCSnmZ
2020-07-31 15:59:20 +08:00
committed by Rusty Russell
parent 3aad86ff9d
commit 094eac4e95
2 changed files with 50 additions and 14 deletions
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4
plugins/libplugin-pay.h
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@@ -232,8 +232,8 @@ struct payment {
struct channel_hint *channel_hints;
struct node_id *excluded_nodes;
/* Optional temporarily excluded channel (i.e. this routehint) */
struct short_channel_id *temp_exclusion;
/* Optional temporarily excluded channels/nodes (i.e. this routehint) */
const char **temp_exclusion;
struct payment_result *result;