Differential D1746 Diff 7346 source/network/IPTools.cpp

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source/network/IPTools.cpp

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				/* Copyright (C) 2019 Wildfire Games.
				* This file is part of 0 A.D.
				*
				* 0 A.D. 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.
				*
				* 0 A.D. 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 0 A.D. If not, see <http://www.gnu.org/licenses/>.
				*/

				#include "precompiled.h"

				#include "IPTools.h"

				#include <arpa/inet.h>
				vladislavbelovUnsubmitted Not Done Inline Actions Windows doesn't have this include. vladislavbelov: Windows doesn't have this include.
				LefoUnsubmitted Done Inline Actions Let's drop windows support entirely and bundle 0ad for windows with cygwin. Lefo: Let's drop windows support entirely and bundle 0ad for windows with cygwin.
				vladislavbelovUnsubmitted Not Done Inline Actions I'm not sure that it's possible currently. We use Win API directly in some cases. We need someone who knows cygwin well. vladislavbelov: I'm not sure that it's possible currently. We use Win API directly in some cases. We need…
				elexisAuthorUnsubmitted Done Inline Actions Wasn't the conclusion to use `getaddrinfo`, making this header obsolete? Let's drop windows support entirely and bundle 0ad for windows with cygwin. That escalated quickly :P elexis: Wasn't the conclusion to use `getaddrinfo`, making this header obsolete? > Let's drop windows…
				#include <string>

				// TODO: implement banmasks

				/**
				* Parses an IPv4 address, such as "223.252.161.128" to an u32 representation in hostbyte order (useful for bitmask matching).
				*/
				bool IPTools::ParseIPv4Address(const std::string& ipAddress, u32& ipAddressNum)
				{
				// Returns in network byte order, big endianness
				// TODO: This doesn't exist on all platforms
				if (inet_pton(AF_INET, ipAddress.c_str(), &ipAddressNum) != 1)
				elexisAuthorUnsubmitted Done Inline Actions @Lefo I wonder if the cheapest platform-independent implementation would be to reinvent the parsing, admittedly I didn't check yet. elexis: @Lefo I wonder if the cheapest platform-independent implementation would be to reinvent the…
				LefoUnsubmitted Not Done Inline Actions Definitely not. You can simply use getaddrinfo to convert ip address to binary representation. See CreateStunRequest in source/network/StunClient.cpp for reference. It might be a good idea to pass AI_NUMERICHOST to hints.ai_flags. If you want to enforce parsing IPv4 only, pass AF_INET to hints.ai_family. See also man 3 getaddrinfo and man 7 ip. Lefo: Definitely not. You can simply use getaddrinfo to convert ip address to binary representation.
				elexisAuthorUnsubmitted Done Inline Actions Thanks! elexis: Thanks!
				return false;

				// Convert to host byte order (little endianness)
				ipAddressNum = ntohl(ipAddressNum);
				return true;
				}

				/**
				* Parses CIDR notation, for example "223.252.161.128/25".
				*/
				bool IPTools::ParseSubnet(const std::string& subnet, u32& subnetAddress, u8& subnetMaskBits)
				{
				std::istringstream subnetStream(subnet);
				std::string subnetAddressString;
				std::getline(subnetStream, subnetAddressString, '/');

				if (!ParseIPv4Address(subnetAddressString, subnetAddress))
				return false;

				std::string subnetMaskBitsString;
				std::getline(subnetStream, subnetMaskBitsString);
				subnetMaskBits = static_cast<u8>(std::stoi(subnetMaskBitsString));

				return true;
				}

				/**
				* All values in hostbyte order (little endianness)
				*/
				bool IPTools::IsIpV4PartOfSubnet(u32 ipAddress, u32 subnetAddress, int subnetMaskBits)
				{
				return ((0xFFFFFFFF << (32 - subnetMaskBits)) & ipAddress) == subnetAddress;
				elexisAuthorUnsubmitted Done Inline Actions @ffffffff hardcoded, is that good? elexis: @ffffffff hardcoded, is that good?
				}