mpd/src/net/ToString.cxx

117 lines
2.5 KiB
C++

// SPDX-License-Identifier: BSD-2-Clause
// author: Max Kellermann <max.kellermann@gmail.com>
#include "ToString.hxx"
#include "Features.hxx"
#include "SocketAddress.hxx"
#include "IPv4Address.hxx"
#include <fmt/core.h>
#include <algorithm>
#include <cassert>
#include <cstring>
#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
#ifdef HAVE_UN
static std::string
LocalAddressToString(std::string_view raw) noexcept
{
if (raw.empty())
return "local";
if (raw.front() != '\0' && raw.back() == '\0')
/* don't convert the null terminator of a non-abstract socket
to a '@' */
raw.remove_suffix(1);
std::string result{raw};
/* replace all null bytes with '@'; this also handles abstract
addresses (Linux specific) */
std::replace(result.begin(), result.end(), '\0', '@');
return result;
}
#endif
std::string
ToString(SocketAddress address) noexcept
{
if (address.IsNull() || address.GetSize() == 0)
return "null";
#ifdef HAVE_UN
if (address.GetFamily() == AF_LOCAL)
/* return path of local socket */
return LocalAddressToString(address.GetLocalRaw());
#endif
#if defined(HAVE_IPV6) && defined(IN6_IS_ADDR_V4MAPPED)
IPv4Address ipv4_buffer;
if (address.IsV4Mapped())
address = ipv4_buffer = address.UnmapV4();
#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";
if (serv[0] != 0 && (serv[0] != '0' || serv[1] != 0)) {
#ifdef HAVE_IPV6
if (address.GetFamily() == AF_INET6) {
return fmt::format("[{}]:{}", host, serv);
}
#endif
return fmt::format("{}:{}", host, serv);
}
return host;
}
std::string
HostToString(SocketAddress address) noexcept
{
if (address.IsNull() || address.GetSize() == 0)
return "null";
#ifdef HAVE_UN
if (address.GetFamily() == AF_LOCAL)
/* return path of local socket */
return LocalAddressToString(address.GetLocalRaw());
#endif
#if defined(HAVE_IPV6) && defined(IN6_IS_ADDR_V4MAPPED)
IPv4Address ipv4_buffer;
if (address.IsV4Mapped())
address = ipv4_buffer = address.UnmapV4();
#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";
return host;
}