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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"
/* Used when comparing CIDR masks for the modulus bits left over.
* A lot of ircd's seem to do this:
* ((-1) << (8 - (mask % 8)))
* But imho, it sucks in comparison to a nice neat lookup table.
*/
const unsigned char inverted_bits[8] = { 0x00, /* 00000000 - 0 bits - never actually used */
0x80, /* 10000000 - 1 bits */
0xC0, /* 11000000 - 2 bits */
0xE0, /* 11100000 - 3 bits */
0xF0, /* 11110000 - 4 bits */
0xF8, /* 11111000 - 5 bits */
0xFC, /* 11111100 - 6 bits */
0xFE /* 11111110 - 7 bits */
};
/* 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
* If you have a lot of hosts to match, youre probably better off building your mask once
* and then using the lower level MatchCIDRBits directly.
*
* 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 = address.substr(username_addr_pos + 1);
cidr_copy = cidr_mask.substr(username_mask_pos + 1);
}
}
else
{
address_copy.assign(address);
cidr_copy.assign(cidr_mask);
}
if (cidr_copy.find('/') == std::string::npos)
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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