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[feat] add configurable all-interface IPv4 listening, refs #129

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This commit is contained in:
dijunkun
2026-10-29 18:23:34 +08:00
parent dd774de4f8
commit f09a4c50d1
15 changed files with 266 additions and 50 deletions
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apps/desktop/src/network/lan/lan_transport.cpp
+30 -3
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@@ -25,7 +25,8 @@ constexpr const char* kPath = "/crossdesk/lan/v2";
constexpr const char* kProtocol = "crossdesk.lan.v2";
void ValidateListener(const std::string& address, unsigned port) {
if (port > 65535) throw std::runtime_error("Invalid LAN port");
const auto interfaces = PhysicalInterfaces();
if (address == kAllIpv4Interfaces) return;
const auto interfaces = LocalIpv4Interfaces();
if (!IsIpv4(address) ||
std::none_of(interfaces.begin(), interfaces.end(),
[&](const auto& i) { return i.address == address; }))
@@ -57,7 +58,7 @@ void CheckListenError(const Error& error) {
throw std::runtime_error("LanPortPermissionDenied");
throw std::runtime_error("Cannot listen on LAN port: " + error.message());
}
void CheckExistingListener(const std::string& address, unsigned port) {
void CheckExistingEndpoint(const std::string& address, unsigned port) {
#ifdef __APPLE__
// BSD permits a specific-address listener alongside a wildcard listener with
// SO_REUSEADDR. Detect that live listener without treating TIME_WAIT or our
@@ -88,6 +89,32 @@ void CheckExistingListener(const std::string& address, unsigned port) {
(void)port;
#endif
}
void CheckExistingListener(const std::string& address, unsigned port) {
#ifdef __APPLE__
if (address == kAllIpv4Interfaces) {
// BSD permits wildcard/specific overlap with SO_REUSEADDR. Probe binds on
// each exact address to detect specific listeners without sending traffic
// through VPN adapters which may accept connects to otherwise unused ports.
// The final wildcard bind detects an existing wildcard listener itself.
asio::io_context io;
auto addresses = LocalIpv4Interfaces();
addresses.push_back({"127.0.0.1"});
for (const auto& interface : addresses) {
asio::ip::tcp::acceptor probe(io);
Error error;
probe.open(asio::ip::tcp::v4(), error);
CheckListenError(error);
probe.set_option(asio::socket_base::reuse_address(true), error);
CheckListenError(error);
probe.bind({asio::ip::make_address_v4(interface.address),
static_cast<unsigned short>(port)}, error);
CheckListenError(error);
}
return;
}
#endif
CheckExistingEndpoint(address, port);
}
std::shared_ptr<Context> TlsContext() {
auto context = std::make_shared<Context>(Context::tls);
if (SSL_CTX_set_min_proto_version(context->native_handle(), TLS1_3_VERSION) !=
@@ -265,7 +292,7 @@ struct Transport::Impl {
}
c->local_address = local.address().to_string();
c->remote_address = remote.address().to_string();
const auto interfaces = PhysicalInterfaces();
const auto interfaces = LocalIpv4Interfaces();
if (!IsIpv4(c->remote_address) ||
std::none_of(
interfaces.begin(), interfaces.end(),