forked from Mirrorlandia_minetest/minetest
0ea8df4d64
Improve error handling on Windows and reduce the size of the `Address` class
260 lines
5.8 KiB
C++
260 lines
5.8 KiB
C++
/*
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Minetest
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Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "address.h"
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#include <cstdio>
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#include <iostream>
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#include <cstdlib>
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#include <cstring>
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#include <cerrno>
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#include <sstream>
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#include <iomanip>
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#include "network/networkexceptions.h"
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#include "util/string.h"
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#include "util/numeric.h"
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#include "constants.h"
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#include "debug.h"
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#include "settings.h"
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#include "log.h"
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#ifdef _WIN32
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// Without this some of the network functions are not found on mingw
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#ifndef _WIN32_WINNT
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#define _WIN32_WINNT 0x0501
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#endif
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#include <windows.h>
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#include <winsock2.h>
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#include <ws2tcpip.h>
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#define LAST_SOCKET_ERR() WSAGetLastError()
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typedef SOCKET socket_t;
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typedef int socklen_t;
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#else
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <fcntl.h>
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#include <netdb.h>
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#include <unistd.h>
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#include <arpa/inet.h>
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#define LAST_SOCKET_ERR() (errno)
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typedef int socket_t;
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#endif
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/*
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Address
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*/
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Address::Address()
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{
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memset(&m_address, 0, sizeof(m_address));
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}
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Address::Address(u32 address, u16 port)
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{
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memset(&m_address, 0, sizeof(m_address));
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setAddress(address);
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setPort(port);
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}
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Address::Address(u8 a, u8 b, u8 c, u8 d, u16 port)
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{
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memset(&m_address, 0, sizeof(m_address));
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setAddress(a, b, c, d);
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setPort(port);
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}
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Address::Address(const IPv6AddressBytes *ipv6_bytes, u16 port)
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{
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memset(&m_address, 0, sizeof(m_address));
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setAddress(ipv6_bytes);
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setPort(port);
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}
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// Equality (address family, IP and port must be equal)
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bool Address::operator==(const Address &other)
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{
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if (other.m_addr_family != m_addr_family || other.m_port != m_port)
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return false;
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if (m_addr_family == AF_INET) {
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return m_address.ipv4.s_addr == other.m_address.ipv4.s_addr;
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}
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if (m_addr_family == AF_INET6) {
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return memcmp(m_address.ipv6.s6_addr,
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other.m_address.ipv6.s6_addr, 16) == 0;
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}
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return false;
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}
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void Address::Resolve(const char *name)
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{
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if (!name || name[0] == 0) {
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if (m_addr_family == AF_INET)
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setAddress(static_cast<u32>(0));
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else if (m_addr_family == AF_INET6)
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setAddress(static_cast<IPv6AddressBytes*>(nullptr));
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return;
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}
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struct addrinfo *resolved, hints;
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memset(&hints, 0, sizeof(hints));
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// Setup hints
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if (g_settings->getBool("enable_ipv6")) {
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// AF_UNSPEC allows both IPv6 and IPv4 addresses to be returned
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hints.ai_family = AF_UNSPEC;
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} else {
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hints.ai_family = AF_INET;
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}
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// Do getaddrinfo()
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int e = getaddrinfo(name, NULL, &hints, &resolved);
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if (e != 0)
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throw ResolveError(gai_strerror(e));
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// Copy data
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if (resolved->ai_family == AF_INET) {
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struct sockaddr_in *t = (struct sockaddr_in *)resolved->ai_addr;
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m_addr_family = AF_INET;
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m_address.ipv4 = t->sin_addr;
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} else if (resolved->ai_family == AF_INET6) {
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struct sockaddr_in6 *t = (struct sockaddr_in6 *)resolved->ai_addr;
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m_addr_family = AF_INET6;
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m_address.ipv6 = t->sin6_addr;
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} else {
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m_addr_family = 0;
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}
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freeaddrinfo(resolved);
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}
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// IP address -> textual representation
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std::string Address::serializeString() const
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{
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// windows XP doesnt have inet_ntop, maybe use better func
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#ifdef _WIN32
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if (m_addr_family == AF_INET) {
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return inet_ntoa(m_address.ipv4);
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} else if (m_addr_family == AF_INET6) {
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std::ostringstream os;
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os << std::hex;
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for (int i = 0; i < 16; i += 2) {
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u16 section = (m_address.ipv6.s6_addr[i] << 8) |
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(m_address.ipv6.s6_addr[i + 1]);
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os << section;
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if (i < 14)
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os << ":";
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}
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return os.str();
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} else {
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return "";
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}
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#else
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char str[INET6_ADDRSTRLEN];
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if (inet_ntop(m_addr_family, (void*) &m_address, str, sizeof(str)) == nullptr)
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return "";
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return str;
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#endif
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}
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struct in_addr Address::getAddress() const
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{
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return m_address.ipv4;
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}
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struct in6_addr Address::getAddress6() const
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{
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return m_address.ipv6;
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}
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u16 Address::getPort() const
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{
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return m_port;
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}
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bool Address::isZero() const
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{
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if (m_addr_family == AF_INET) {
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return m_address.ipv4.s_addr == 0;
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}
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if (m_addr_family == AF_INET6) {
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static const char zero[16] = {0};
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return memcmp(m_address.ipv6.s6_addr, zero, 16) == 0;
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}
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return false;
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}
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void Address::setAddress(u32 address)
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{
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m_addr_family = AF_INET;
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m_address.ipv4.s_addr = htonl(address);
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}
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void Address::setAddress(u8 a, u8 b, u8 c, u8 d)
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{
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u32 addr = (a << 24) | (b << 16) | (c << 8) | d;
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setAddress(addr);
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}
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void Address::setAddress(const IPv6AddressBytes *ipv6_bytes)
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{
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m_addr_family = AF_INET6;
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if (ipv6_bytes)
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memcpy(m_address.ipv6.s6_addr, ipv6_bytes->bytes, 16);
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else
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memset(m_address.ipv6.s6_addr, 0, 16);
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}
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void Address::setPort(u16 port)
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{
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m_port = port;
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}
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void Address::print(std::ostream *s) const
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{
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if (m_addr_family == AF_INET6)
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*s << "[" << serializeString() << "]:" << m_port;
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else if (m_addr_family == AF_INET)
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*s << serializeString() << ":" << m_port;
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else
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*s << "(undefined)";
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}
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bool Address::isLocalhost() const
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{
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if (isIPv6()) {
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static const u8 localhost_bytes[] = {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1};
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static const u8 mapped_ipv4_localhost[] = {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff, 0x7f, 0, 0, 0};
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auto addr = m_address.ipv6.s6_addr;
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return memcmp(addr, localhost_bytes, 16) == 0 ||
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memcmp(addr, mapped_ipv4_localhost, 13) == 0;
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}
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auto addr = ntohl(m_address.ipv4.s_addr);
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return (addr >> 24) == 0x7f;
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}
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