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/*
* 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, ':') != 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;
}
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 == nullptr) {
/* 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 == nullptr && default_port != 0) {
snprintf(buffer, sizeof(buffer), "%u", default_port);
port = buffer;
}
if ((flags & AI_PASSIVE) != 0 && strcmp(host, "*") == 0)
host = nullptr;
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 nullptr;
}
return ai;
}
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