2 * InspIRCd -- Internet Relay Chat Daemon
4 * Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
5 * Copyright (C) 2008 Craig Edwards <craigedwards@brainbox.cc>
6 * Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
8 * This file is part of InspIRCd. InspIRCd is free software: you can
9 * redistribute it and/or modify it under the terms of the GNU General Public
10 * License as published by the Free Software Foundation, version 2.
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
14 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
24 /* Used when comparing CIDR masks for the modulus bits left over.
25 * A lot of ircd's seem to do this:
26 * ((-1) << (8 - (mask % 8)))
27 * But imho, it sucks in comparison to a nice neat lookup table.
29 const unsigned char inverted_bits[8] = { 0x00, /* 00000000 - 0 bits - never actually used */
30 0x80, /* 10000000 - 1 bits */
31 0xC0, /* 11000000 - 2 bits */
32 0xE0, /* 11100000 - 3 bits */
33 0xF0, /* 11110000 - 4 bits */
34 0xF8, /* 11111000 - 5 bits */
35 0xFC, /* 11111100 - 6 bits */
36 0xFE /* 11111110 - 7 bits */
40 /* 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
41 * If you have a lot of hosts to match, youre probably better off building your mask once
42 * and then using the lower level MatchCIDRBits directly.
44 * This will also attempt to match any leading usernames or nicknames on the mask, using
45 * match(), when match_with_username is true.
47 bool irc::sockets::MatchCIDR(const std::string &address, const std::string &cidr_mask, bool match_with_username)
49 std::string address_copy;
50 std::string cidr_copy;
52 /* The caller is trying to match ident@<mask>/bits.
53 * Chop off the ident@ portion, use match() on it
56 if (match_with_username)
58 /* Use strchr not strrchr, because its going to be nearer to the left */
59 std::string::size_type username_mask_pos = cidr_mask.rfind('@');
60 std::string::size_type username_addr_pos = address.rfind('@');
62 /* Both strings have an @ symbol in them */
63 if (username_mask_pos != std::string::npos && username_addr_pos != std::string::npos)
65 /* Try and match() the strings before the @
66 * symbols, and recursively call MatchCIDR without
67 * username matching enabled to match the host part.
69 return (InspIRCd::Match(address.substr(0, username_addr_pos), cidr_mask.substr(0, username_mask_pos), ascii_case_insensitive_map) &&
70 MatchCIDR(address.substr(username_addr_pos + 1), cidr_mask.substr(username_mask_pos + 1), false));
74 address_copy = address.substr(username_addr_pos + 1);
75 cidr_copy = cidr_mask.substr(username_mask_pos + 1);
80 address_copy.assign(address);
81 cidr_copy.assign(cidr_mask);
84 if (cidr_copy.find('/') == std::string::npos)
87 irc::sockets::sockaddrs addr;
88 irc::sockets::aptosa(address_copy, 0, addr);
90 irc::sockets::cidr_mask mask(cidr_copy);
91 irc::sockets::cidr_mask mask2(addr, mask.length);