/* * 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 #ifdef WIN32 #include #else #include #ifdef HAVE_TCP #include #endif #endif #ifdef HAVE_UN #include #endif #include #include #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; }