Enable IPv6 for reporting / sharing / etc.

UI/RemoteISOScreen.cpp

@@ -71,13 +71,34 @@ static void RegisterServer(int port) {
 	http::Client http;
 	Buffer theVoid;
 
-	if (http.Resolve(REPORT_HOSTNAME, REPORT_PORT)) {
+	char resource4[1024] = {};
+	if (http.Resolve(REPORT_HOSTNAME, REPORT_PORT, net::DNSType::IPV4)) {
 		if (http.Connect(2, 20.0, &scanCancelled)) {
-			char resource[1024] = {};
 			std::string ip = fd_util::GetLocalIP(http.sock());
-			snprintf(resource, sizeof(resource) - 1, "/match/update?local=%s&port=%d", ip.c_str(), port);
+			snprintf(resource4, sizeof(resource4) - 1, "/match/update?local=%s&port=%d", ip.c_str(), port);
+
+			http.GET(resource4, &theVoid);
+			theVoid.Skip(theVoid.size());
+			http.Disconnect();
+		}
+	}
+
+	if (http.Resolve(REPORT_HOSTNAME, REPORT_PORT, net::DNSType::IPV6)) {
+		// We register both IPv4 and IPv6 in case the other client is using a different one.
+		if (resource4[0] != 0 && http.Connect()) {
+			http.GET(resource4, &theVoid);
+			theVoid.Skip(theVoid.size());
+			http.Disconnect();
+		}
+
+		// Currently, we're not using keepalive, so gotta reconnect...
+		if (http.Connect()) {
+			char resource6[1024] = {};
+			std::string ip = fd_util::GetLocalIP(http.sock());
+			snprintf(resource6, sizeof(resource6) - 1, "/match/update?local=%s&port=%d", ip.c_str(), port);
 
-			http.GET(resource, &theVoid);
+			http.GET(resource6, &theVoid);
+			theVoid.Skip(theVoid.size());
 			http.Disconnect();
 		}
 	}

ext/native/file/fd_util.cpp

@@ -133,11 +133,22 @@ void SetNonBlocking(int sock, bool non_blocking) {
 }
 
 std::string GetLocalIP(int sock) {
-	struct sockaddr_in server_addr;
+	union {
+		struct sockaddr sa;
+		struct sockaddr_in ipv4;
+		struct sockaddr_in6 ipv6;
+	} server_addr;
 	memset(&server_addr, 0, sizeof(server_addr));
 	socklen_t len = sizeof(server_addr);
 	if (getsockname(sock, (struct sockaddr *)&server_addr, &len) == 0) {
-		char *result = inet_ntoa(*(in_addr *)&server_addr.sin_addr);
+		char temp[64];
+		void *addr;
+		if (server_addr.sa.sa_family == AF_INET6) {
+			addr = &server_addr.ipv6.sin6_addr;
+		} else {
+			addr = &server_addr.ipv4.sin_addr;
+		}
+		const char *result = inet_ntop(server_addr.sa.sa_family, addr, temp, sizeof(temp));
 		if (result) {
 			return result;
 		}

ext/native/net/http_client.cpp

@@ -46,7 +46,7 @@ inline unsigned short myhtons(unsigned short x) {
 	return (x >> 8) | (x << 8);
 }
 
-bool Connection::Resolve(const char *host, int port) {
+bool Connection::Resolve(const char *host, int port, DNSType type) {
 	if ((intptr_t)sock_ != -1) {
 		ELOG("Resolve: Already have a socket");
 		return false;
@@ -63,7 +63,7 @@ bool Connection::Resolve(const char *host, int port) {
 	snprintf(port_str, sizeof(port_str), "%d", port);
 
 	std::string err;
-	if (!net::DNSResolve(host, port_str, &resolved_, err)) {
+	if (!net::DNSResolve(host, port_str, &resolved_, err, type)) {
 		ELOG("Failed to resolve host %s: %s", host, err.c_str());
 		// So that future calls fail.
 		port_ = 0;
@@ -87,10 +87,10 @@ bool Connection::Connect(int maxTries, double timeout, bool *cancelConnect) {
 		FD_ZERO(&fds);
 		for (addrinfo *possible = resolved_; possible != nullptr; possible = possible->ai_next) {
 			// TODO: Could support ipv6 without huge difficulty...
-			if (possible->ai_family != AF_INET)
+			if (possible->ai_family != AF_INET && possible->ai_family != AF_INET6)
 				continue;
 
-			int sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+			int sock = socket(possible->ai_family, SOCK_STREAM, IPPROTO_TCP);
 			if ((intptr_t)sock == -1) {
 				ELOG("Bad socket");
 				continue;

ext/native/net/http_client.h

@@ -6,6 +6,7 @@
 
 #include "base/basictypes.h"
 #include "base/buffer.h"
+#include "net/resolve.h"
 
 #ifdef _WIN32
 #ifndef NOMINMAX
@@ -28,7 +29,7 @@ class Connection {
 	virtual ~Connection();
 
 	// Inits the sockaddr_in.
-	bool Resolve(const char *host, int port);
+	bool Resolve(const char *host, int port, DNSType type = DNSType::ANY);
 
 	bool Connect(int maxTries = 2, double timeout = 20.0f, bool *cancelConnect = nullptr);
 	void Disconnect();

ext/native/net/http_server.cpp

@@ -130,9 +130,21 @@ void Server::SetFallbackHandler(UrlHandlerFunc handler) {
 	fallback_ = handler;
 }
 
-bool Server::Listen(int port) {
+bool Server::Listen(int port, net::DNSType type) {
+	bool success = false;
+	if (type == net::DNSType::ANY || type == net::DNSType::IPV6) {
+		success = Listen6(port, type == net::DNSType::IPV6);
+	}
+	if (!success && (type == net::DNSType::ANY || type == net::DNSType::IPV4)) {
+		success = Listen4(port);
+	}
+	return success;
+}
+
+bool Server::Listen4(int port) {
 	listener_ = socket(AF_INET, SOCK_STREAM, 0);
-	CHECK_GE(listener_, 0);
+	if (listener_ < 0)
+		return false;
 
 	struct sockaddr_in server_addr;
 	memset(&server_addr, 0, sizeof(server_addr));
@@ -145,14 +157,18 @@ bool Server::Listen(int port) {
 	setsockopt(listener_, SOL_SOCKET, SO_REUSEADDR, (const char *)&opt, sizeof(opt));
 
 	if (bind(listener_, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
+		closesocket(listener_);
 		ELOG("Failed to bind to port %i. Bailing.", port);
 		return false;
 	}
 
 	fd_util::SetNonBlocking(listener_, true);
 
 	// 1024 is the max number of queued requests.
-	CHECK_GE(listen(listener_, 1024), 0);
+	if (listen(listener_, 1024) < 0) {
+		closesocket(listener_);
+		return false;
+	}
 
 	socklen_t len = sizeof(server_addr);
 	if (getsockname(listener_, (struct sockaddr *)&server_addr, &len) == 0) {
@@ -165,6 +181,50 @@ bool Server::Listen(int port) {
 	return true;
 }
 
+bool Server::Listen6(int port, bool ipv6_only) {
+	listener_ = socket(AF_INET6, SOCK_STREAM, 0);
+	if (listener_ < 0)
+		return false;
+
+	struct sockaddr_in6 server_addr;
+	memset(&server_addr, 0, sizeof(server_addr));
+	server_addr.sin6_family = AF_INET6;
+	server_addr.sin6_addr = in6addr_any;
+	server_addr.sin6_port = htons(port);
+
+	int opt = 1;
+	// Enable re-binding to avoid the pain when restarting the server quickly.
+	setsockopt(listener_, SOL_SOCKET, SO_REUSEADDR, (const char *)&opt, sizeof(opt));
+
+	// Enable listening on IPv6 and IPv4?
+	opt = ipv6_only ? 1 : 0;
+	setsockopt(listener_, IPPROTO_IPV6, IPV6_V6ONLY, (const char *)&opt, sizeof(opt));
+
+	if (bind(listener_, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
+		closesocket(listener_);
+		ELOG("Failed to bind to port %i. Bailing.", port);
+		return false;
+	}
+
+	fd_util::SetNonBlocking(listener_, true);
+
+	// 1024 is the max number of queued requests.
+	if (listen(listener_, 1024) < 0) {
+		closesocket(listener_);
+		return false;
+	}
+
+	socklen_t len = sizeof(server_addr);
+	if (getsockname(listener_, (struct sockaddr *)&server_addr, &len) == 0) {
+		port = ntohs(server_addr.sin6_port);
+	}
+
+	ILOG("HTTP server started on port %i", port);
+	port_ = port;
+
+	return true;
+}
+
 bool Server::RunSlice(double timeout) {
 	if (listener_ < 0 || port_ == 0) {
 		return false;
@@ -177,9 +237,13 @@ bool Server::RunSlice(double timeout) {
 		return false;
 	}
 
-	sockaddr client_addr;
+	union {
+		struct sockaddr sa;
+		struct sockaddr_in ipv4;
+		struct sockaddr_in6 ipv6;
+	} client_addr;
 	socklen_t client_addr_size = sizeof(client_addr);
-	int conn_fd = accept(listener_, &client_addr, &client_addr_size);
+	int conn_fd = accept(listener_, &client_addr.sa, &client_addr_size);
 	if (conn_fd >= 0) {
 		executor_->Run(std::bind(&Server::HandleConnection, this, conn_fd));
 		return true;

ext/native/net/http_server.h

@@ -6,6 +6,7 @@
 
 #include "base/buffer.h"
 #include "net/http_headers.h"
+#include "net/resolve.h"
 #include "thread/executor.h"
 
 namespace net {
@@ -73,7 +74,7 @@ class Server {
 	// May run for (significantly) longer than timeout, but won't wait longer than that
 	// for a new connection to handle.
 	bool RunSlice(double timeout);
-	bool Listen(int port);
+	bool Listen(int port, net::DNSType type = net::DNSType::ANY);
 	void Stop();
 
 	void RegisterHandler(const char *url_path, UrlHandlerFunc handler);
@@ -85,10 +86,13 @@ class Server {
 	virtual void HandleRequest(const Request &request);
 
 	int Port() {
-	  return port_;
+		return port_;
 	}
 
 private:
+	bool Listen6(int port, bool ipv6_only);
+	bool Listen4(int port);
+
 	void HandleConnection(int conn_fd);
 
 	// Things like default 404, etc.

ext/native/net/resolve.cpp

@@ -77,7 +77,7 @@ char *DNSResolve(const char *host)
 	return ip;
 }
 
-bool DNSResolve(const std::string &host, const std::string &service, addrinfo **res, std::string &error)
+bool DNSResolve(const std::string &host, const std::string &service, addrinfo **res, std::string &error, DNSType type)
 {
 	addrinfo hints = {0};
 	// TODO: Might be uses to lookup other values.
@@ -89,7 +89,11 @@ bool DNSResolve(const std::string &host, const std::string &service, addrinfo **
 	// http://stackoverflow.com/questions/1408030/what-is-the-purpose-of-the-ai-v4mapped-flag-in-getaddrinfo
 	hints.ai_flags = /*AI_V4MAPPED |*/ AI_ADDRCONFIG;
 #endif
-	hints.ai_protocol = IPPROTO_TCP;
+	hints.ai_protocol = 0;
+	if (type == DNSType::IPV4)
+		hints.ai_family = AF_INET;
+	else if (type == DNSType::IPV6)
+		hints.ai_family = AF_INET6;
 
 	const char *servicep = service.length() == 0 ? NULL : service.c_str();
 

ext/native/net/resolve.h

@@ -14,7 +14,13 @@ void Shutdown();
 char *DNSResolveTry(const char *host, const char **err);
 char *DNSResolve(const char *host);
 
-bool DNSResolve(const std::string &host, const std::string &service, addrinfo **res, std::string &error);
+enum class DNSType {
+	ANY = 0,
+	IPV4 = 1,
+	IPV6 = 2,
+};
+
+bool DNSResolve(const std::string &host, const std::string &service, addrinfo **res, std::string &error, DNSType type = DNSType::ANY);
 void DNSResolveFree(addrinfo *res);
 
 int inet_pton(int af, const char* src, void* dst);