dfaf08743c
Only _WIN32 is defined by the compiler, and WIN32 is not standardized and may be missing. Closes #169
153 lines
4.0 KiB
C++
153 lines
4.0 KiB
C++
/*
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* Copyright (C) 2011-2017 Max Kellermann <max.kellermann@gmail.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "ToString.hxx"
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#include "Features.hxx"
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#include "SocketAddress.hxx"
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#include <algorithm>
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#ifdef _WIN32
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#include <ws2tcpip.h>
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#else
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#include <netdb.h>
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#ifdef HAVE_TCP
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#include <netinet/in.h>
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#endif
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#endif
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#ifdef HAVE_UN
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#include <sys/un.h>
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#endif
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#include <assert.h>
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#include <string.h>
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#ifdef HAVE_UN
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static std::string
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LocalAddressToString(const struct sockaddr_un &s_un, size_t size) noexcept
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{
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const size_t prefix_size = (size_t)
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((struct sockaddr_un *)nullptr)->sun_path;
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assert(size >= prefix_size);
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size_t result_length = size - prefix_size;
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/* remove the trailing null terminator */
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if (result_length > 0 && s_un.sun_path[result_length - 1] == 0)
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--result_length;
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if (result_length == 0)
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return "local";
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std::string result(s_un.sun_path, result_length);
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/* replace all null bytes with '@'; this also handles abstract
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addresses (Linux specific) */
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std::replace(result.begin(), result.end(), '\0', '@');
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return result;
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}
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#endif
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#if defined(HAVE_IPV6) && defined(IN6_IS_ADDR_V4MAPPED)
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gcc_pure
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static bool
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IsV4Mapped(SocketAddress address) noexcept
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{
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if (address.GetFamily() != AF_INET6)
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return false;
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const auto &a6 = *(const struct sockaddr_in6 *)address.GetAddress();
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return IN6_IS_ADDR_V4MAPPED(&a6.sin6_addr);
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}
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/**
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* Convert "::ffff:127.0.0.1" to "127.0.0.1".
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*/
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static SocketAddress
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UnmapV4(SocketAddress src, struct sockaddr_in &buffer) noexcept
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{
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assert(IsV4Mapped(src));
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const auto &src6 = *(const struct sockaddr_in6 *)src.GetAddress();
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memset(&buffer, 0, sizeof(buffer));
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buffer.sin_family = AF_INET;
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memcpy(&buffer.sin_addr, ((const char *)&src6.sin6_addr) + 12,
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sizeof(buffer.sin_addr));
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buffer.sin_port = src6.sin6_port;
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return { (const struct sockaddr *)&buffer, sizeof(buffer) };
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}
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#endif
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std::string
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ToString(SocketAddress address) noexcept
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{
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#ifdef HAVE_UN
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if (address.GetFamily() == AF_UNIX)
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/* return path of UNIX domain sockets */
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return LocalAddressToString(*(const sockaddr_un *)address.GetAddress(),
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address.GetSize());
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#endif
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#if defined(HAVE_IPV6) && defined(IN6_IS_ADDR_V4MAPPED)
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struct sockaddr_in in_buffer;
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if (IsV4Mapped(address))
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address = UnmapV4(address, in_buffer);
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#endif
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char host[NI_MAXHOST], serv[NI_MAXSERV];
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int ret = getnameinfo(address.GetAddress(), address.GetSize(),
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host, sizeof(host), serv, sizeof(serv),
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NI_NUMERICHOST|NI_NUMERICSERV);
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if (ret != 0)
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return "unknown";
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#ifdef HAVE_IPV6
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if (strchr(host, ':') != nullptr) {
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std::string result("[");
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result.append(host);
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result.append("]:");
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result.append(serv);
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return result;
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}
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#endif
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std::string result(host);
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result.push_back(':');
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result.append(serv);
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return result;
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}
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