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libutp_inet_ntop.cpp
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libutp_inet_ntop.cpp
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/*
* 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.
*/
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include "libutp_inet_ntop.h"
//######################################################################
const char *libutp::inet_ntop(int af, const void *src, char *dest, size_t length)
{
if (af != AF_INET && af != AF_INET6)
{
return NULL;
}
SOCKADDR_STORAGE address;
DWORD address_length;
if (af == AF_INET)
{
address_length = sizeof(sockaddr_in);
sockaddr_in* ipv4_address = (sockaddr_in*)(&address);
ipv4_address->sin_family = AF_INET;
ipv4_address->sin_port = 0;
memcpy(&ipv4_address->sin_addr, src, sizeof(in_addr));
}
else // AF_INET6
{
address_length = sizeof(sockaddr_in6);
sockaddr_in6* ipv6_address = (sockaddr_in6*)(&address);
ipv6_address->sin6_family = AF_INET6;
ipv6_address->sin6_port = 0;
ipv6_address->sin6_flowinfo = 0;
// hmmm
ipv6_address->sin6_scope_id = 0;
memcpy(&ipv6_address->sin6_addr, src, sizeof(in6_addr));
}
DWORD string_length = (DWORD)(length);
int result;
result = WSAAddressToStringA((sockaddr*)(&address),
address_length, 0, dest,
&string_length);
// one common reason for this to fail is that ipv6 is not installed
return result == SOCKET_ERROR ? NULL : dest;
}
//######################################################################
int libutp::inet_pton(int af, const char* src, void* dest)
{
if (af != AF_INET && af != AF_INET6)
{
return -1;
}
SOCKADDR_STORAGE address;
int address_length = sizeof(SOCKADDR_STORAGE);
int result = WSAStringToAddressA((char*)(src), af, 0,
(sockaddr*)(&address),
&address_length);
if (af == AF_INET)
{
if (result != SOCKET_ERROR)
{
sockaddr_in* ipv4_address =(sockaddr_in*)(&address);
memcpy(dest, &ipv4_address->sin_addr, sizeof(in_addr));
}
else if (strcmp(src, "255.255.255.255") == 0)
{
((in_addr*)(dest))->s_addr = INADDR_NONE;
}
}
else // AF_INET6
{
if (result != SOCKET_ERROR)
{
sockaddr_in6* ipv6_address = (sockaddr_in6*)(&address);
memcpy(dest, &ipv6_address->sin6_addr, sizeof(in6_addr));
}
}
return result == SOCKET_ERROR ? -1 : 1;
}