Merge bitcoin/bitcoin#30085: p2p: detect addnode cjdns peers in GetAddedNodeInfo()

d0b0474 test: add GetAddedNodeInfo() CJDNS regression unit test (Jon Atack)
684da97 p2p, bugfix: detect addnode cjdns peers in GetAddedNodeInfo() (Jon Atack)

Pull request description:

  Addnode peers connected to us via the cjdns network are currently not detected by `CConnman::GetAddedNodeInfo()`, i.e. `fConnected` is always false. This causes the following issues:

  - RPC `getaddednodeinfo` incorrectly shows them as not connected

  - `CConnman::ThreadOpenAddedConnections()` continually retries to connect them

  Fix the issue and add a unit regression test. Extracted from #28248. Suggest running the test with:

  `./src/test/test_bitcoin -t net_peer_connection_tests -l test_suite`

ACKs for top commit:
  mzumsande:
    utACK d0b0474
  brunoerg:
    crACK d0b0474
  pinheadmz:
    ACK d0b0474

Tree-SHA512: a4d81425f79558f5792585611f3fe8ab999b82144daeed5c3ec619861c69add934c2b2afdad24c8488a0ade94f5ce8112f5555d60a1ce913d4f5a1cf5dbba55a

Author: fanquake

src/net.cpp

@@ -2831,7 +2831,7 @@ std::vector<AddedNodeInfo> CConnman::GetAddedNodeInfo(bool include_connected) co
     }
 
     for (const auto& addr : lAddresses) {
-        CService service(LookupNumeric(addr.m_added_node, GetDefaultPort(addr.m_added_node)));
+        CService service{MaybeFlipIPv6toCJDNS(LookupNumeric(addr.m_added_node, GetDefaultPort(addr.m_added_node)))};
         AddedNodeInfo addedNode{addr, CService(), false, false};
         if (service.IsValid()) {
             // strAddNode is an IP:port

src/test/net_peer_connection_tests.cpp

@@ -108,6 +108,12 @@ BOOST_AUTO_TEST_CASE(test_addnode_getaddednodeinfo_and_connection_detection)
     AddPeer(id, nodes, *peerman, *connman, ConnectionType::BLOCK_RELAY, /*onion_peer=*/true);
     AddPeer(id, nodes, *peerman, *connman, ConnectionType::INBOUND);
 
+    // Add a CJDNS peer connection.
+    AddPeer(id, nodes, *peerman, *connman, ConnectionType::INBOUND, /*onion_peer=*/false,
+            /*address=*/"[fc00:3344:5566:7788:9900:aabb:ccdd:eeff]:1234");
+    BOOST_CHECK(nodes.back()->IsInboundConn());
+    BOOST_CHECK_EQUAL(nodes.back()->ConnectedThroughNetwork(), Network::NET_CJDNS);
+
     BOOST_TEST_MESSAGE("Call AddNode() for all the peers");
     for (auto node : connman->TestNodes()) {
         BOOST_CHECK(connman->AddNode({/*m_added_node=*/node->addr.ToStringAddrPort(), /*m_use_v2transport=*/true}));