bolt9

commit 845c02f2fa0a547823c0cb59bd784b28390bb85f
parent b8ce66e205120a75884c8649b924ecc2df05d8b7
Author: Jared Tobin <jared@jtobin.io>
Date:   Sat, 10 Oct 2026 13:09:23 +0400

lib: check dependencies in validateRemote

BOLT 1 (init) and BOLT 11 (invoice) require the receiver to reject a
feature vector that doesn't set all known transitive dependencies.
validateRemote now includes the dependency check that validateLocal
already performed.

Diffstat:
M
lib/Lightning/Protocol/BOLT9/Validate.hs
 | 
2
++

1 file changed, 2 insertions(+), 0 deletions(-)
diff --git a/lib/Lightning/Protocol/BOLT9/Validate.hs b/lib/Lightning/Protocol/BOLT9/Validate.hs
@@ -220,6 +220,7 @@ validateNoBothBits !fv = go knownFeatures
 --   * Unknown even (required) bits are errors
 --   * If both bits of a pair are set, treat as required (not an error)
 --   * Context restrictions still apply for known features
+--   * All dependencies of set features are also set
 --
 --   >>> import Lightning.Protocol.BOLT9.Codec (setBit)
 --   >>> validateRemote Init (setBit 999 empty)  -- unknown odd bit: ok
@@ -230,6 +231,7 @@ validateRemote :: Context -> FeatureVector -> Either [ValidationError] ()
 validateRemote !ctx !fv =
   let errs = unknownRequiredErrors fv
           ++ contextErrors ctx fv
+          ++ dependencyErrors fv
           ++ parityErrors ctx fv
   in  if null errs
       then Right ()