X-Git-Url: https://git.netwichtig.de/gitweb/?a=blobdiff_plain;f=src%2Fcidr.cpp;h=f45c63b98d6d0461f43efd9a8c4c99f3f4dbf843;hb=fe41ae3e8194d531e6e7427ec30d3fb58871498c;hp=1288d269b1b4b3aa95d78cfbfb3ef6cafefaec55;hpb=02bbbd0cdf44d2f745008db876db574ce41b768d;p=user%2Fhenk%2Fcode%2Finspircd.git diff --git a/src/cidr.cpp b/src/cidr.cpp index 1288d269b..f45c63b98 100644 --- a/src/cidr.cpp +++ b/src/cidr.cpp @@ -1,204 +1,90 @@ -/* +------------------------------------+ - * | Inspire Internet Relay Chat Daemon | - * +------------------------------------+ +/* + * InspIRCd -- Internet Relay Chat Daemon * - * InspIRCd: (C) 2002-2008 InspIRCd Development Team - * See: http://www.inspircd.org/wiki/index.php/Credits + * Copyright (C) 2019 Sadie Powell + * Copyright (C) 2014-2015 Attila Molnar + * Copyright (C) 2012 Robby + * Copyright (C) 2009-2010 Daniel De Graaf + * Copyright (C) 2009 Uli Schlachter + * Copyright (C) 2008 Robin Burchell + * Copyright (C) 2008 Craig Edwards * - * This program is free but copyrighted software; see - * the file COPYING for details. + * 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: libIRCDcidr */ #include "inspircd.h" -#include "wildcard.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 raw bytes using CIDR bit matching, used by higher level MatchCIDR() */ -bool irc::sockets::MatchCIDRBits(unsigned char* address, unsigned char* mask, unsigned int mask_bits) -{ - unsigned int divisor = mask_bits / 8; /* Number of whole bytes in the mask */ - unsigned int modulus = mask_bits % 8; /* Remaining bits in the mask after whole bytes are dealt with */ - - /* First (this is faster) compare the odd bits with logic ops */ - if (modulus) - if ((address[divisor] & inverted_bits[modulus]) != (mask[divisor] & inverted_bits[modulus])) - /* If they dont match, return false */ - return false; - - /* Secondly (this is slower) compare the whole bytes */ - if (memcmp(address, mask, divisor)) - return false; - - /* The address matches the mask, to mask_bits bits of mask */ - return true; -} - -/* Match CIDR, but dont attempt to match() against leading *!*@ sections */ -bool irc::sockets::MatchCIDR(const char* address, const char* cidr_mask) -{ - return MatchCIDR(address, cidr_mask, false); -} /* 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 char* address, const char* cidr_mask, bool match_with_username) +bool irc::sockets::MatchCIDR(const std::string &address, const std::string &cidr_mask, bool match_with_username) { - unsigned char addr_raw[16]; - unsigned char mask_raw[16]; - unsigned int bits = 0; - char* mask = NULL; + 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. + * separately. */ if (match_with_username) { - /* Duplicate the strings, and try to find the position - * of the @ symbol in each - */ - char* address_dupe = strdup(address); - char* cidr_dupe = strdup(cidr_mask); - /* Use strchr not strrchr, because its going to be nearer to the left */ - char* username_mask_pos = strrchr(cidr_dupe, '@'); - char* username_addr_pos = strrchr(address_dupe, '@'); + 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 && username_addr_pos) + if (username_mask_pos != std::string::npos && username_addr_pos != std::string::npos) { - /* Zero out the location of the @ symbol */ - *username_mask_pos = *username_addr_pos = 0; - /* Try and match() the strings before the @ * symbols, and recursively call MatchCIDR without * username matching enabled to match the host part. */ - bool result = (match(address_dupe, cidr_dupe) && MatchCIDR(username_addr_pos + 1, username_mask_pos + 1, false)); - - /* Free the stuff we created */ - free(address_dupe); - free(cidr_dupe); - - /* Return a result */ - return result; + 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 { - /* One or both didnt have an @ in, - * just match as CIDR - */ - free(address_dupe); - free(cidr_dupe); - mask = strdup(cidr_mask); + address_copy.assign(address, username_addr_pos + 1, std::string::npos); + cidr_copy.assign(cidr_mask, username_mask_pos + 1, std::string::npos); } } else { - /* Make a copy of the cidr mask string, - * we're going to change it - */ - mask = strdup(cidr_mask); + address_copy.assign(address); + cidr_copy.assign(cidr_mask); } - in_addr address_in4; - in_addr mask_in4; - - - /* Use strrchr for this, its nearer to the right */ - char* bits_chars = strrchr(mask,'/'); - - if (bits_chars) - { - bits = atoi(bits_chars + 1); - *bits_chars = 0; - } - else + 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)) { - /* No 'number of bits' field! */ - free(mask); + // The CIDR mask is invalid return false; } -#ifdef SUPPORT_IP6LINKS - in6_addr address_in6; - in6_addr mask_in6; - - if (inet_pton(AF_INET6, address, &address_in6) > 0) + irc::sockets::sockaddrs addr; + if (!irc::sockets::aptosa(address_copy, 0, addr)) { - if (inet_pton(AF_INET6, mask, &mask_in6) > 0) - { - memcpy(&addr_raw, &address_in6.s6_addr, 16); - memcpy(&mask_raw, &mask_in6.s6_addr, 16); - - if (bits > 128) - bits = 128; - } - else - { - /* The address was valid ipv6, but the mask - * that goes with it wasnt. - */ - free(mask); - return false; - } - } - else -#endif - if (inet_pton(AF_INET, address, &address_in4) > 0) - { - if (inet_pton(AF_INET, mask, &mask_in4) > 0) - { - memcpy(&addr_raw, &address_in4.s_addr, 4); - memcpy(&mask_raw, &mask_in4.s_addr, 4); - - if (bits > 32) - bits = 32; - } - else - { - /* The address was valid ipv4, - * but the mask that went with it wasnt. - */ - free(mask); - return false; - } - } - else - { - /* The address was neither ipv4 or ipv6 */ - free(mask); + // The address could not be parsed. return false; } - /* Low-level-match the bits in the raw data */ - free(mask); - return MatchCIDRBits(addr_raw, mask_raw, bits); -} - - + irc::sockets::cidr_mask mask(cidr_copy); + irc::sockets::cidr_mask mask2(addr, mask.length); + return mask == mask2; +}