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/*
* 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
#if defined(HAVE_IPV6) && defined(IN6_IS_ADDR_V4MAPPED)
gcc_pure
static bool
IsV4Mapped(SocketAddress address)
{
if (address.GetFamily() != AF_INET6)
return false;
const auto &a6 = *(const struct sockaddr_in6 *)address.GetAddress();
return IN6_IS_ADDR_V4MAPPED(&a6.sin6_addr);
}
/**
* Convert "::ffff:127.0.0.1" to "127.0.0.1".
*/
static SocketAddress
UnmapV4(SocketAddress src, struct sockaddr_in &buffer)
{
assert(IsV4Mapped(src));
const auto &src6 = *(const struct sockaddr_in6 *)src.GetAddress();
memset(&buffer, 0, sizeof(buffer));
buffer.sin_family = AF_INET;
memcpy(&buffer.sin_addr, ((const char *)&src6.sin6_addr) + 12,
sizeof(buffer.sin_addr));
buffer.sin_port = src6.sin6_port;
return { (const struct sockaddr *)&buffer, sizeof(buffer) };
}
#endif
std::string
ToString(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)
struct sockaddr_in in_buffer;
if (IsV4Mapped(address))
address = UnmapV4(address, in_buffer);
#endif
char host[NI_MAXHOST], serv[NI_MAXSERV];
int 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;
}
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