peer: create interface when the connection has been established and no interface exists yet

Allows using dynamic interfaces with dynamic peers.

3 files changed, 23 insertions, 4 deletions

diff --git a/src/peer.c b/src/peer.c
index 9f6c228..8a95398 100644
--- a/src/peer.c
+++ b/src/peer.c
@@ -871,14 +871,29 @@ void fastd_peer_handle_handshake_queue(void) {
 }
 
 /** Marks a peer as established */
-void fastd_peer_set_established(fastd_peer_t *peer) {
+bool fastd_peer_set_established(fastd_peer_t *peer) {
 	if (fastd_peer_is_established(peer))
-		return;
+		return true;
+
+	if (!peer->iface) {
+		const char *ifname = peer->ifname;
+
+		if (!ifname && fastd_config_single_iface())
+			ifname = conf.ifname;
+
+		peer->iface = fastd_iface_open(ifname, peer);
+		if (peer->iface)
+			on_up(peer, false);
+		else
+			return false;
+	}
 
 	peer->state = STATE_ESTABLISHED;
 	peer->established = ctx.now;
 	on_establish(peer);
 	pr_info("connection with %P established.", peer);
+
+	return true;
 }
 
 /** Compares two MAC addresses */
diff --git a/src/peer.h b/src/peer.h
index 1dcc43b..e77462c 100644
--- a/src/peer.h
+++ b/src/peer.h
@@ -169,7 +169,7 @@ bool fastd_peer_add(fastd_peer_t *peer);
 void fastd_peer_reset(fastd_peer_t *peer);
 void fastd_peer_delete(fastd_peer_t *peer);
 void fastd_peer_free(fastd_peer_t *peer);
-void fastd_peer_set_established(fastd_peer_t *peer);
+bool fastd_peer_set_established(fastd_peer_t *peer);
 bool fastd_peer_may_connect(fastd_peer_t *peer);
 void fastd_peer_handle_resolve(fastd_peer_t *peer, fastd_remote_t *remote, size_t n_addresses, const fastd_peer_address_t *addresses);
 bool fastd_peer_owns_address(const fastd_peer_t *peer, const fastd_peer_address_t *addr);
diff --git a/src/protocols/ec25519_fhmqvc/handshake.c b/src/protocols/ec25519_fhmqvc/handshake.c
index 7dda0a1..bbe572d 100644
--- a/src/protocols/ec25519_fhmqvc/handshake.c
+++ b/src/protocols/ec25519_fhmqvc/handshake.c
@@ -156,9 +156,13 @@ static bool establish(fastd_peer_t *peer, const fastd_method_info_t *method, fas
 		return false;
 	}
 
+	if (!fastd_peer_set_established(peer)) {
+		fastd_peer_reset(peer);
+		return false;
+	}
+
 	peer->establish_handshake_timeout = ctx.now + MIN_HANDSHAKE_INTERVAL;
 	fastd_peer_seen(peer);
-	fastd_peer_set_established(peer);
 
 	pr_verbose("new session with %P established using method `%s'%s.", peer, method->name, salt ? "" : " (compat mode)");