net/Resolver: move sockaddr_to_string() to ToString.cxx

1 files changed, 124 insertions, 0 deletions

diff --git a/src/net/ToString.cxx b/src/net/ToString.cxx
new file mode 100644
index 000000000..49a5067a8
--- /dev/null
+++ b/src/net/ToString.cxx
@@ -0,0 +1,124 @@
+/*
+ * 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 "ToString.hxx"
+#include "SocketAddress.hxx"
+
+#include <algorithm>
+
+#ifdef WIN32
+#include <ws2tcpip.h>
+#else
+#include <netdb.h>
+#ifdef HAVE_TCP
+#include <netinet/in.h>
+#endif
+#endif
+
+#ifdef HAVE_UN
+#include <sys/un.h>
+#endif
+
+#include <assert.h>
+#include <string.h>
+
+#ifdef HAVE_UN
+
+static std::string
+LocalAddressToString(const struct sockaddr_un &s_un, size_t size)
+{
+	const size_t prefix_size = (size_t)
+		((struct sockaddr_un *)nullptr)->sun_path;
+	assert(size >= prefix_size);
+
+	size_t result_length = size - prefix_size;
+
+	/* remove the trailing null terminator */
+	if (result_length > 0 && s_un.sun_path[result_length - 1] == 0)
+		--result_length;
+
+	if (result_length == 0)
+		return "local";
+
+	std::string result(s_un.sun_path, result_length);
+
+	/* replace all null bytes with '@'; this also handles abstract
+	   addresses (Linux specific) */
+	std::replace(result.begin(), result.end(), '\0', '@');
+
+	return result;
+}
+
+#endif
+
+std::string
+sockaddr_to_string(SocketAddress address)
+{
+#ifdef HAVE_UN
+	if (address.GetFamily() == AF_UNIX)
+		/* return path of UNIX domain sockets */
+		return LocalAddressToString(*(const sockaddr_un *)address.GetAddress(),
+					    address.GetSize());
+#endif
+
+#if defined(HAVE_IPV6) && defined(IN6_IS_ADDR_V4MAPPED)
+	const struct sockaddr_in6 *a6 = (const struct sockaddr_in6 *)
+		address.GetAddress();
+	struct sockaddr_in a4;
+#endif
+	int ret;
+	char host[NI_MAXHOST], serv[NI_MAXSERV];
+
+#if defined(HAVE_IPV6) && defined(IN6_IS_ADDR_V4MAPPED)
+	if (address.GetFamily() == AF_INET6 &&
+	    IN6_IS_ADDR_V4MAPPED(&a6->sin6_addr)) {
+		/* convert "::ffff:127.0.0.1" to "127.0.0.1" */
+
+		memset(&a4, 0, sizeof(a4));
+		a4.sin_family = AF_INET;
+		memcpy(&a4.sin_addr, ((const char *)&a6->sin6_addr) + 12,
+		       sizeof(a4.sin_addr));
+		a4.sin_port = a6->sin6_port;
+
+		address = { (const struct sockaddr *)&a4, sizeof(a4) };
+	}
+#endif
+
+	ret = getnameinfo(address.GetAddress(), address.GetSize(),
+			  host, sizeof(host), serv, sizeof(serv),
+			  NI_NUMERICHOST|NI_NUMERICSERV);
+	if (ret != 0)
+		return "unknown";
+
+#ifdef HAVE_IPV6
+	if (strchr(host, ':') != nullptr) {
+		std::string result("[");
+		result.append(host);
+		result.append("]:");
+		result.append(serv);
+		return result;
+	}
+#endif
+
+	std::string result(host);
+	result.push_back(':');
+	result.append(serv);
+	return result;
+}