/* * InspIRCd -- Internet Relay Chat Daemon * * Copyright (C) 2009 Daniel De Graaf * Copyright (C) 2008 Craig Edwards * Copyright (C) 2008 Robin Burchell * * 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 . */ /* $Core */ #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@/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); } 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("0123456789.:") < 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; }