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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2008 Craig Edwards <craigedwards@brainbox.cc>
* Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
*
* This file is part of InspIRCd. InspIRCd 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, version 2.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "inspircd.h"
/* Match CIDR strings, e.g. 127.0.0.1 to 127.0.0.0/8 or 3ffe:1:5:6::8 to 3ffe:1::0/32
*
* This will also attempt to match any leading usernames or nicknames on the mask, using
* match(), when match_with_username is true.
*/
bool irc::sockets::MatchCIDR(const std::string &address, const std::string &cidr_mask, bool match_with_username)
{
std::string address_copy;
std::string cidr_copy;
/* The caller is trying to match ident@<mask>/bits.
* Chop off the ident@ portion, use match() on it
* seperately.
*/
if (match_with_username)
{
/* Use strchr not strrchr, because its going to be nearer to the left */
std::string::size_type username_mask_pos = cidr_mask.rfind('@');
std::string::size_type username_addr_pos = address.rfind('@');
/* Both strings have an @ symbol in them */
if (username_mask_pos != std::string::npos && username_addr_pos != std::string::npos)
{
/* Try and match() the strings before the @
* symbols, and recursively call MatchCIDR without
* username matching enabled to match the host part.
*/
return (InspIRCd::Match(address.substr(0, username_addr_pos), cidr_mask.substr(0, username_mask_pos), ascii_case_insensitive_map) &&
MatchCIDR(address.substr(username_addr_pos + 1), cidr_mask.substr(username_mask_pos + 1), false));
}
else
{
address_copy.assign(address, username_addr_pos + 1, std::string::npos);
cidr_copy.assign(cidr_mask, username_mask_pos + 1, std::string::npos);
}
}
else
{
address_copy.assign(address);
cidr_copy.assign(cidr_mask);
}
const std::string::size_type per_pos = cidr_copy.rfind('/');
if ((per_pos == std::string::npos) || (per_pos == cidr_copy.length()-1)
|| (cidr_copy.find_first_not_of("0123456789", per_pos+1) != std::string::npos)
|| (cidr_copy.find_first_not_of("0123456789abcdefABCDEF.:") < per_pos))
{
// The CIDR mask is invalid
return false;
}
irc::sockets::sockaddrs addr;
irc::sockets::aptosa(address_copy, 0, addr);
irc::sockets::cidr_mask mask(cidr_copy);
irc::sockets::cidr_mask mask2(addr, mask.length);
return mask == mask2;
}
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