1 files changed, 97 insertions, 0 deletions
diff --git a/src/net/Resolver.cxx b/src/net/Resolver.cxx
new file mode 100644
index 000000000..189c5bc9c
--- /dev/null
+++ b/src/net/Resolver.cxx
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2003-2015 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "Resolver.hxx"
+#include "SocketAddress.hxx"
+#include "util/Error.hxx"
+#include "util/Domain.hxx"
+
+#include <string>
+
+#ifdef WIN32
+#include <ws2tcpip.h>
+#else
+#include <netdb.h>
+#endif
+
+#include <string.h>
+#include <stdio.h>
+
+const Domain resolver_domain("resolver");
+
+struct addrinfo *
+resolve_host_port(const char *host_port, unsigned default_port,
+		  int flags, int socktype,
+		  Error &error)
+{
+	std::string p(host_port);
+	const char *host = p.c_str(), *port = nullptr;
+
+	if (host_port[0] == '[') {
+		/* IPv6 needs enclosing square braces, to
+		   differentiate between IP colons and the port
+		   separator */
+
+		size_t q = p.find(']', 1);
+		if (q != p.npos && p[q + 1] == ':' && p[q + 2] != 0) {
+			p[q] = 0;
+			port = host + q + 2;
+			++host;
+		}
+	}
+
+	if (port == nullptr) {
+		/* port is after the colon, but only if it's the only
+		   colon (don't split IPv6 addresses) */
+
+		auto q = p.find(':');
+		if (q != p.npos && p[q + 1] != 0 &&
+		    p.find(':', q + 1) == p.npos) {
+			p[q] = 0;
+			port = host + q + 1;
+		}
+	}
+
+	char buffer[32];
+	if (port == nullptr && default_port != 0) {
+		snprintf(buffer, sizeof(buffer), "%u", default_port);
+		port = buffer;
+	}
+
+	if ((flags & AI_PASSIVE) != 0 && strcmp(host, "*") == 0)
+		host = nullptr;
+
+	addrinfo hints;
+	memset(&hints, 0, sizeof(hints));
+	hints.ai_flags = flags;
+	hints.ai_family = AF_UNSPEC;
+	hints.ai_socktype = socktype;
+
+	struct addrinfo *ai;
+	int ret = getaddrinfo(host, port, &hints, &ai);
+	if (ret != 0) {
+		error.Format(resolver_domain, ret,
+			     "Failed to look up '%s': %s",
+			     host_port, gai_strerror(ret));
+		return nullptr;
+	}
+
+	return ai;
+}