/* +------------------------------------+ * | Inspire Internet Relay Chat Daemon | * +------------------------------------+ * * InspIRCd: (C) 2002-2010 InspIRCd Development Team * See: http://wiki.inspircd.org/Credits * * This program is free but copyrighted software; see * the file COPYING for details. * * --------------------------------------------------- */ /* $Core */ #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@/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; }