YTSFlix_Go/vendor/github.com/anacrolix/go-libutp/utp_packedsockaddr.cpp

// vim:set ts=4 sw=4 ai:

/*
 * Copyright (c) 2010-2013 BitTorrent, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include <string.h>
#include <assert.h>
#include <stdio.h>

#include "utp_types.h"
#include "utp_hash.h"
#include "utp_packedsockaddr.h"

#include "libutp_inet_ntop.h"

byte PackedSockAddr::get_family() const
{
	#if defined(__sh__)
		return ((_sin6d[0] == 0) && (_sin6d[1] == 0) && (_sin6d[2] == htonl(0xffff)) != 0) ?
			AF_INET : AF_INET6;
	#else
		return (IN6_IS_ADDR_V4MAPPED(&_in._in6addr) != 0) ? AF_INET : AF_INET6;
	#endif // defined(__sh__)
}

bool PackedSockAddr::operator==(const PackedSockAddr& rhs) const
{
	if (&rhs == this)
		return true;
	if (_port != rhs._port)
		return false;
	return memcmp(_sin6, rhs._sin6, sizeof(_sin6)) == 0;
}

bool PackedSockAddr::operator!=(const PackedSockAddr& rhs) const
{
	return !(*this == rhs);
}

uint32 PackedSockAddr::compute_hash() const {
	return utp_hash_mem(&_in, sizeof(_in)) ^ _port;
}

void PackedSockAddr::set(const SOCKADDR_STORAGE* sa, socklen_t len)
{
	if (sa->ss_family == AF_INET) {
		assert(len >= sizeof(sockaddr_in));
		const sockaddr_in *sin = (sockaddr_in*)sa;
		_sin6w[0] = 0;
		_sin6w[1] = 0;
		_sin6w[2] = 0;
		_sin6w[3] = 0;
		_sin6w[4] = 0;
		_sin6w[5] = 0xffff;
		_sin4 = sin->sin_addr.s_addr;
		_port = ntohs(sin->sin_port);
	} else {
		assert(len >= sizeof(sockaddr_in6));
		const sockaddr_in6 *sin6 = (sockaddr_in6*)sa;
		_in._in6addr = sin6->sin6_addr;
		_port = ntohs(sin6->sin6_port);
	}
}

PackedSockAddr::PackedSockAddr(const SOCKADDR_STORAGE* sa, socklen_t len)
{
	set(sa, len);
}

PackedSockAddr::PackedSockAddr(void)
{
	SOCKADDR_STORAGE sa;
	socklen_t len = sizeof(SOCKADDR_STORAGE);
	memset(&sa, 0, len);
	sa.ss_family = AF_INET;
	set(&sa, len);
}

SOCKADDR_STORAGE PackedSockAddr::get_sockaddr_storage(socklen_t *len = NULL) const
{
	SOCKADDR_STORAGE sa;
	const byte family = get_family();
	if (family == AF_INET) {
		sockaddr_in *sin = (sockaddr_in*)&sa;
		if (len) *len = sizeof(sockaddr_in);
		memset(sin, 0, sizeof(sockaddr_in));
		sin->sin_family = family;
		sin->sin_port = htons(_port);
		sin->sin_addr.s_addr = _sin4;
	} else {
		sockaddr_in6 *sin6 = (sockaddr_in6*)&sa;
		memset(sin6, 0, sizeof(sockaddr_in6));
		if (len) *len = sizeof(sockaddr_in6);
		sin6->sin6_family = family;
		sin6->sin6_addr = _in._in6addr;
		sin6->sin6_port = htons(_port);
	}
	return sa;
}

// #define addrfmt(x, s) x.fmt(s, sizeof(s))
cstr PackedSockAddr::fmt(str s, size_t len) const
{
	memset(s, 0, len);
	const byte family = get_family();
	str i;
	if (family == AF_INET) {
		INET_NTOP(family, (uint32*)&_sin4, s, len);
		i = s;
		while (*++i) {}
	} else {
		i = s;
		*i++ = '[';
		INET_NTOP(family, (in6_addr*)&_in._in6addr, i, len-1);
		while (*++i) {}
		*i++ = ']';
	}
	snprintf(i, len - (i-s), ":%u", _port);
	return s;
}