/* * InspIRCd -- Internet Relay Chat Daemon * * Copyright (C) 2019 linuxdaemon * Copyright (C) 2013, 2018-2019 Sadie Powell * Copyright (C) 2013 Adam * Copyright (C) 2012-2013, 2016 Attila Molnar * Copyright (C) 2012 Robby * Copyright (C) 2009 Uli Schlachter * Copyright (C) 2009 Daniel De Graaf * Copyright (C) 2008-2009 Robin Burchell * Copyright (C) 2007 Dennis Friis * Copyright (C) 2005-2010 Craig Edwards * * 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 . */ #pragma once #include "inspircd.h" #include "convto.h" /******************************************************* * This file contains classes and templates that deal * with the comparison and hashing of 'irc strings'. * An 'irc string' is a string which compares in a * case insensitive manner, and as per RFC 1459 will * treat [ identical to {, ] identical to }, and \ * as identical to |. * * There are functors that accept std::string and * compare/hash them as type irc::string by using * mapping arrays internally. *******************************************************/ /** Separate from the other casemap tables so that code *can* still exclusively rely on RFC casemapping * if it must. * * This is provided as a pointer so that modules can change it to their custom mapping tables, * e.g. for national character support. */ CoreExport extern unsigned const char *national_case_insensitive_map; /** A mapping of uppercase to lowercase, including scandinavian * 'oddities' as specified by RFC1459, e.g. { -> [, and | -> \ */ CoreExport extern unsigned const char rfc_case_insensitive_map[256]; /** Case insensitive map, ASCII rules. * That is; * [ != {, but A == a. */ CoreExport extern unsigned const char ascii_case_insensitive_map[256]; /** The irc namespace contains a number of helper classes. */ namespace irc { /** Check if two IRC object (e.g. nick or channel) names are equal. * This function uses national_case_insensitive_map to determine equality, which, by default does comparison * according to RFC 1459, treating certain otherwise non-identical characters as identical. * @param s1 First string to compare * @param s2 Second string to compare * @return True if the two names are equal, false otherwise */ CoreExport bool equals(const std::string& s1, const std::string& s2); /** Check whether \p needle exists within \p haystack. * @param haystack The string to search within. * @param needle The string to search for. * @return Either the index at which \p needle was found or std::string::npos. */ CoreExport size_t find(const std::string& haystack, const std::string& needle); /** This class returns true if two strings match. * Case sensitivity is ignored, and the RFC 'character set' * is adhered to */ struct StrHashComp { /** The operator () does the actual comparison in hash_map */ bool operator()(const std::string& s1, const std::string& s2) const { return equals(s1, s2); } }; struct insensitive { size_t CoreExport operator()(const std::string &s) const; }; struct insensitive_swo { bool CoreExport operator()(const std::string& a, const std::string& b) const; }; /** irc::sepstream allows for splitting token separated lists. * Each successive call to sepstream::GetToken() returns * the next token, until none remain, at which point the method returns * false. */ class CoreExport sepstream { protected: /** Original string. */ std::string tokens; /** Separator value */ char sep; /** Current string position */ size_t pos; /** If set then GetToken() can return an empty string */ bool allow_empty; public: /** Create a sepstream and fill it with the provided data */ sepstream(const std::string &source, char separator, bool allowempty = false); /** Fetch the next token from the stream * @param token The next token from the stream is placed here * @return True if tokens still remain, false if there are none left */ bool GetToken(std::string& token); /** Fetch the next numeric token from the stream * @param token The next token from the stream is placed here * @return True if tokens still remain, false if there are none left */ template bool GetNumericToken(Numeric& token) { std::string str; if (!GetToken(str)) return false; token = ConvToNum(str); return true; } /** Fetch the entire remaining stream, without tokenizing * @return The remaining part of the stream */ const std::string GetRemaining(); /** Returns true if the end of the stream has been reached * @return True if the end of the stream has been reached, otherwise false */ bool StreamEnd(); /** Returns true if the specified value exists in the stream * @param value The value to search for * @return True if the value was found, False otherwise */ bool Contains(const std::string& value); }; /** A derived form of sepstream, which separates on commas */ class CoreExport commasepstream : public sepstream { public: /** Initialize with comma separator */ commasepstream(const std::string &source, bool allowempty = false) : sepstream(source, ',', allowempty) { } }; /** A derived form of sepstream, which separates on spaces */ class CoreExport spacesepstream : public sepstream { public: /** Initialize with space separator */ spacesepstream(const std::string &source, bool allowempty = false) : sepstream(source, ' ', allowempty) { } }; /** irc::tokenstream reads a string formatted as per RFC1459 and RFC2812. * It will split the string into 'tokens' each containing one parameter * from the string. * For instance, if it is instantiated with the string: * "PRIVMSG #test :foo bar baz qux" * then each successive call to tokenstream::GetToken() will return * "PRIVMSG", "#test", "foo bar baz qux", "". * Note that if the whole string starts with a colon this is not taken * to mean the string is all one parameter, and the first item in the * list will be ":item". This is to allow for parsing 'source' fields * from data. */ class CoreExport tokenstream { private: /** The message we are parsing tokens from. */ std::string message; /** The current position within the message. */ size_t position; public: /** Create a tokenstream and fill it with the provided data. */ tokenstream(const std::string& msg, size_t start = 0, size_t end = std::string::npos); /** Retrieves the underlying message. */ std::string& GetMessage() { return message; } /** Retrieve the next \ token in the token stream. * @param token The next token available, or an empty string if none remain. * @return True if tokens are left to be read, false if the last token was just retrieved. */ bool GetMiddle(std::string& token); /** Retrieve the next \ token in the token stream. * @param token The next token available, or an empty string if none remain. * @return True if tokens are left to be read, false if the last token was just retrieved. */ bool GetTrailing(std::string& token); }; /** The portparser class separates out a port range into integers. * A port range may be specified in the input string in the form * "6660,6661,6662-6669,7020". The end of the stream is indicated by * a return value of 0 from portparser::GetToken(). If you attempt * to specify an illegal range (e.g. one where start >= end, or * start or end < 0) then GetToken() will return the first element * of the pair of numbers. */ class CoreExport portparser { private: /** Used to split on commas */ commasepstream sep; /** Current position in a range of ports */ long in_range; /** Starting port in a range of ports */ long range_begin; /** Ending port in a range of ports */ long range_end; /** Allow overlapped port ranges */ bool overlapped; /** Used to determine overlapping of ports * without O(n) algorithm being used */ std::set overlap_set; /** Returns true if val overlaps an existing range */ bool Overlaps(long val); public: /** Create a portparser and fill it with the provided data * @param source The source text to parse from * @param allow_overlapped Allow overlapped ranges */ portparser(const std::string &source, bool allow_overlapped = true); /** Fetch the next token from the stream * @return The next port number is returned, or 0 if none remain */ long GetToken(); }; }