From 41b2ba748531605a1afd84fdb967330c0efc529f Mon Sep 17 00:00:00 2001 From: Bitflash Date: Wed, 29 Jul 2026 14:11:58 -0300 Subject: net: exchange signed .btf descriptors between peers (#32) Discovery has depended entirely on the Nostr relays. Two connected nodes never told each other who else existed, so a relay outage left a running network unable to grow, and a node that found one stale peer had no way to learn there was anything better. The old `addr` gossip went out with the IRC seed. Peers now trade signed descriptors over a new "btfpeers" message: our own first, then peers that actually answered us. The receiver checks each Schnorr signature against the key the `.btf` address decodes to, so the sender is trusted for nothing -- forging an entry needs somebody else's secret key. That leaves flooding with self-generated keys, which the per-message caps and the "peers that answered" ordering are there to blunt. Unknown commands are ignored (main.cpp), so nodes without this just drop the message; nothing here is a protocol break. The cache from the peer-cache change now keeps each peer's descriptor verbatim alongside the parsed fields, because that signature is what makes a peer relayable. Entries without one -- resolved through Nostr, or written before this -- stay dialable, just not passed on. A dial never clears a descriptor already on file. --- src/nostr.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'src/nostr.h') diff --git a/src/nostr.h b/src/nostr.h index 04149e3..b5eb5e3 100644 --- a/src/nostr.h +++ b/src/nostr.h @@ -82,6 +82,14 @@ bool BtfGetIdentity(unsigned char pubkey[32], unsigned char enc_sk[32]); // This node's printable .btf address, or "" if the identity failed to load. std::string BtfLocalAddress(); +// This node's own signed descriptor, ready to hand to a peer over the wire. +// "" until ThreadBtfAccept has registered at a rendezvous. +std::string BtfLocalDescriptor(); + +// The shared secp256k1 context, for btf::VerifyDescriptor (which takes it as +// void* to keep headers free of secp). NULL if the identity failed to load. +void* BtfSecpContext(); + // Resolve a .btf address via the public discovery relays: fetch the owner's // self-certified descriptor and return its meeting node ("host:port") and // x25519 public key for the end-to-end channel. -- cgit v1.2.3