/* * Copyright (C) 2003-2014 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 "util/Error.hxx" #include "util/Domain.hxx" #ifndef WIN32 #include <sys/socket.h> #include <netdb.h> #ifdef HAVE_TCP #include <netinet/in.h> #endif #else #include <ws2tcpip.h> #include <winsock.h> #endif #ifdef HAVE_UN #include <sys/un.h> #endif #include <string.h> #include <stdio.h> const Domain resolver_domain("resolver"); std::string sockaddr_to_string(const struct sockaddr *sa, size_t length) { #ifdef HAVE_UN if (sa->sa_family == AF_UNIX) { /* return path of UNIX domain sockets */ const sockaddr_un &s_un = *(const sockaddr_un *)sa; if (length < sizeof(s_un) || s_un.sun_path[0] == 0) return "local"; return s_un.sun_path; } #endif #if defined(HAVE_IPV6) && defined(IN6_IS_ADDR_V4MAPPED) const struct sockaddr_in6 *a6 = (const struct sockaddr_in6 *)sa; struct sockaddr_in a4; #endif int ret; char host[NI_MAXHOST], serv[NI_MAXSERV]; #if defined(HAVE_IPV6) && defined(IN6_IS_ADDR_V4MAPPED) if (sa->sa_family == 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; sa = (const struct sockaddr *)&a4; length = sizeof(a4); } #endif ret = getnameinfo(sa, length, host, sizeof(host), serv, sizeof(serv), NI_NUMERICHOST|NI_NUMERICSERV); if (ret != 0) return "unknown"; #ifdef HAVE_IPV6 if (strchr(host, ':') != NULL) { 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; } 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 == NULL) { /* 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 == NULL && default_port != 0) { snprintf(buffer, sizeof(buffer), "%u", default_port); port = buffer; } if ((flags & AI_PASSIVE) != 0 && strcmp(host, "*") == 0) host = NULL; 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 NULL; } return ai; }