Function addnode

src/rpc/net.cpp:319–387

}

static RPCMethod addnode()
{
    return RPCMethod{
        "addnode",
        "Attempts to add or remove a node from the addnode list.\n"
                "Or try a connection to a node once.\n"
                "Nodes added using addnode (or -connect) are protected from DoS disconnection and are not required to be\n"
                "full nodes/support SegWit as other outbound peers are (though such peers will not be synced from).\n" +
                strprintf("Addnode connections are limited to %u at a time", MAX_ADDNODE_CONNECTIONS) +
                " and are counted separately from the -maxconnections limit.\n",
                {
                    {"node", RPCArg::Type::STR, RPCArg::Optional::NO, "The IP address/hostname optionally followed by :port of the peer to connect to"},
                    {"command", RPCArg::Type::STR, RPCArg::Optional::NO, "'add' to add a node to the list, 'remove' to remove a node from the list, 'onetry' to try a connection to the node once"},
                    {"v2transport", RPCArg::Type::BOOL, RPCArg::DefaultHint{"set by -v2transport"}, "Attempt to connect using BIP324 v2 transport protocol (ignored for 'remove' command)"},
                },
                RPCResult{RPCResult::Type::NONE, "", ""},
                RPCExamples{
                    HelpExampleCli("addnode", "\"192.168.0.6:8333\" \"onetry\" true")
            + HelpExampleRpc("addnode", "\"192.168.0.6:8333\", \"onetry\" true")
                },
        [](const RPCMethod& self, const JSONRPCRequest& request) -> UniValue
{
    const auto command{self.Arg<std::string_view>("command")};
    if (command != "onetry" && command != "add" && command != "remove") {
        throw std::runtime_error(
            self.ToString());
    }

    NodeContext& node = EnsureAnyNodeContext(request.context);
    CConnman& connman = EnsureConnman(node);

    const auto node_arg{self.Arg<std::string_view>("node")};
    bool node_v2transport = connman.GetLocalServices() & NODE_P2P_V2;
    bool use_v2transport = self.MaybeArg<bool>("v2transport").value_or(node_v2transport);

    if (use_v2transport && !node_v2transport) {
        throw JSONRPCError(RPC_INVALID_PARAMETER, "Error: v2transport requested but not enabled (see -v2transport)");
    }

    if (command == "onetry")
    {
        CAddress addr;
        connman.OpenNetworkConnection(/*addrConnect=*/addr,
                                      /*fCountFailure=*/false,
                                      /*grant_outbound=*/{},
                                      /*pszDest=*/std::string{node_arg}.c_str(),
                                      /*conn_type=*/ConnectionType::MANUAL,
                                      /*use_v2transport=*/use_v2transport,
                                      /*proxy_override=*/std::nullopt);
        return UniValue::VNULL;
    }

    if (command == "add")
    {
        if (!connman.AddNode({std::string{node_arg}, use_v2transport})) {
            throw JSONRPCError(RPC_CLIENT_NODE_ALREADY_ADDED, "Error: Node already added");
        }
    }