/* * InspIRCd -- Internet Relay Chat Daemon * * Copyright (C) 2009 Daniel De Graaf * Copyright (C) 2005-2009 Craig Edwards * Copyright (C) 2007-2008 Robin Burchell * Copyright (C) 2007 Dennis Friis * * 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" #include "hashcomp.h" /****************************************************** * * The hash functions of InspIRCd are the centrepoint * of the entire system. If these functions are * inefficient or wasteful, the whole program suffers * as a result. A lot of C programmers in the ircd * scene spend a lot of time debating (arguing) about * the best way to write hash functions to hash irc * nicknames, channels etc. * We are lucky as C++ developers as unordered_map does * a lot of this for us. It does intellegent memory * requests, bucketing, search functions, insertion * and deletion etc. All we have to do is write some * overloaded comparison and hash value operators which * cause it to act in an irc-like way. The features we * add to the standard hash_map are: * * Case insensitivity: The hash_map will be case * insensitive. * * Scandanavian Comparisons: The characters [, ], \ will * be considered the lowercase of {, } and |. * ******************************************************/ /** * A case insensitive mapping of characters from upper case to lower case for * the ASCII character set. */ unsigned const char ascii_case_insensitive_map[256] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, // 0-9 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, // 10-19 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, // 20-29 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, // 30-39 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, // 40-49 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, // 50-59 60, 61, 62, 63, 64, 97, 98, 99, 100, 101, // 60-69 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, // 70-79 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, // 80-89 122, 91, 92, 93, 94, 95, 96, 97, 98, 99, // 90-99 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, // 100-109 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, // 110-119 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, // 120-129 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, // 130-139 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, // 140-149 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, // 150-159 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, // 160-169 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, // 170-179 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, // 180-189 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, // 190-199 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, // 200-209 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, // 210-219 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, // 220-229 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, // 230-249 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, // 240-249 250, 251, 252, 253, 254, 255, // 250-255 }; /** * A case insensitive mapping of characters from upper case to lower case for * the character set of RFC 1459. This is identical to ASCII with the small * exception of {}| being considered to be the lower case equivalents of the * characters []\ respectively. */ unsigned const char rfc_case_insensitive_map[256] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, // 0-9 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, // 10-19 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, // 20-29 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, // 30-39 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, // 40-49 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, // 50-59 60, 61, 62, 63, 64, 97, 98, 99, 100, 101, // 60-69 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, // 70-79 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, // 80-89 122, 123, 124, 125, 94, 95, 96, 97, 98, 99, // 90-99 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, // 100-109 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, // 110-119 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, // 120-129 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, // 130-139 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, // 140-149 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, // 150-159 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, // 160-169 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, // 170-179 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, // 180-189 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, // 190-199 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, // 200-209 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, // 210-219 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, // 220-229 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, // 230-239 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, // 240-249 250, 251, 252, 253, 254, 255, // 250-255 }; /** * A case sensitive mapping of characters from upper case to lower case for the * character set of RFC 1459. This is identical to ASCII. */ unsigned const char rfc_case_sensitive_map[256] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, // 0-9 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, // 10-19 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, // 20-29 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, // 30-39 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, // 40-49 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, // 50-59 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, // 60-69 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, // 70-79 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, // 80-89 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, // 90-99 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, // 100-109 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, // 110-119 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, // 120-129 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, // 130-139 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, // 140-149 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, // 150-159 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, // 160-169 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, // 170-179 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, // 180-189 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, // 190-199 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, // 200-209 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, // 210-219 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, // 220-229 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, // 230-239 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, // 240-249 250, 251, 252, 253, 254, 255, // 250-255 }; size_t CoreExport irc::hash::operator()(const irc::string &s) const { register size_t t = 0; for (irc::string::const_iterator x = s.begin(); x != s.end(); ++x) /* ++x not x++, as its faster */ t = 5 * t + national_case_insensitive_map[(unsigned char)*x]; return t; } bool irc::StrHashComp::operator()(const std::string& s1, const std::string& s2) const { const unsigned char* n1 = (const unsigned char*)s1.c_str(); const unsigned char* n2 = (const unsigned char*)s2.c_str(); for (; *n1 && *n2; n1++, n2++) if (national_case_insensitive_map[*n1] != national_case_insensitive_map[*n2]) return false; return (national_case_insensitive_map[*n1] == national_case_insensitive_map[*n2]); } size_t irc::insensitive::operator()(const std::string &s) const { /* XXX: NO DATA COPIES! :) * The hash function here is practically * a copy of the one in STL's hash_fun.h, * only with *x replaced with national_case_insensitive_map[*x]. * This avoids a copy to use hash */ register size_t t = 0; for (std::string::const_iterator x = s.begin(); x != s.end(); ++x) /* ++x not x++, as its faster */ t = 5 * t + national_case_insensitive_map[(unsigned char)*x]; return t; } /****************************************************** * * This is the implementation of our special irc::string * class which is a case-insensitive equivalent to * std::string which is not only case-insensitive but * can also do scandanavian comparisons, e.g. { = [, etc. * * This class depends on the const array 'national_case_insensitive_map'. * ******************************************************/ bool irc::irc_char_traits::eq(char c1st, char c2nd) { return national_case_insensitive_map[(unsigned char)c1st] == national_case_insensitive_map[(unsigned char)c2nd]; } bool irc::irc_char_traits::ne(char c1st, char c2nd) { return national_case_insensitive_map[(unsigned char)c1st] != national_case_insensitive_map[(unsigned char)c2nd]; } bool irc::irc_char_traits::lt(char c1st, char c2nd) { return national_case_insensitive_map[(unsigned char)c1st] < national_case_insensitive_map[(unsigned char)c2nd]; } int irc::irc_char_traits::compare(const char* str1, const char* str2, size_t n) { for(unsigned int i = 0; i < n; i++) { if(national_case_insensitive_map[(unsigned char)*str1] > national_case_insensitive_map[(unsigned char)*str2]) return 1; if(national_case_insensitive_map[(unsigned char)*str1] < national_case_insensitive_map[(unsigned char)*str2]) return -1; if(*str1 == 0 || *str2 == 0) return 0; str1++; str2++; } return 0; } const char* irc::irc_char_traits::find(const char* s1, int n, char c) { while(n-- > 0 && national_case_insensitive_map[(unsigned char)*s1] != national_case_insensitive_map[(unsigned char)c]) s1++; return (n >= 0) ? s1 : NULL; } irc::tokenstream::tokenstream(const std::string &source) : spacesepstream(source) { } bool irc::tokenstream::GetToken(std::string &token) { bool first = !pos; if (!spacesepstream::GetToken(token)) return false; /* This is the last parameter */ if (token[0] == ':' && !first) { token = token.substr(1); if (!StreamEnd()) { token += ' '; token += GetRemaining(); } pos = tokens.length() + 1; } return true; } bool irc::tokenstream::GetToken(irc::string &token) { std::string stdstring; bool returnval = GetToken(stdstring); token = assign(stdstring); return returnval; } bool irc::tokenstream::GetToken(int &token) { std::string tok; bool returnval = GetToken(tok); token = ConvToInt(tok); return returnval; } bool irc::tokenstream::GetToken(long &token) { std::string tok; bool returnval = GetToken(tok); token = ConvToInt(tok); return returnval; } irc::sepstream::sepstream(const std::string& source, char separator, bool allowempty) : tokens(source), sep(separator), pos(0), allow_empty(allowempty) { } bool irc::sepstream::GetToken(std::string &token) { if (this->StreamEnd()) { token.clear(); return false; } if (!this->allow_empty) { this->pos = this->tokens.find_first_not_of(this->sep, this->pos); if (this->pos == std::string::npos) { this->pos = this->tokens.length() + 1; token.clear(); return false; } } size_t p = this->tokens.find(this->sep, this->pos); if (p == std::string::npos) p = this->tokens.length(); token = this->tokens.substr(this->pos, p - this->pos); this->pos = p + 1; return true; } const std::string irc::sepstream::GetRemaining() { return !this->StreamEnd() ? this->tokens.substr(this->pos) : ""; } bool irc::sepstream::StreamEnd() { return this->pos > this->tokens.length(); } irc::modestacker::modestacker(bool add) : adding(add) { sequence.clear(); sequence.push_back(""); } void irc::modestacker::Push(char modeletter, const std::string ¶meter) { *(sequence.begin()) += modeletter; sequence.push_back(parameter); } void irc::modestacker::Push(char modeletter) { this->Push(modeletter,""); } void irc::modestacker::PushPlus() { this->Push('+',""); } void irc::modestacker::PushMinus() { this->Push('-',""); } int irc::modestacker::GetStackedLine(std::vector &result, int max_line_size) { if (sequence.empty()) { return 0; } unsigned int n = 0; int size = 1; /* Account for initial +/- char */ int nextsize = 0; int start = result.size(); std::string modeline = adding ? "+" : "-"; result.push_back(modeline); if (sequence.size() > 1) nextsize = sequence[1].length() + 2; while (!sequence[0].empty() && (sequence.size() > 1) && (n < ServerInstance->Config->Limits.MaxModes) && ((size + nextsize) < max_line_size)) { modeline += *(sequence[0].begin()); if (!sequence[1].empty()) { result.push_back(sequence[1]); size += nextsize; /* Account for mode character and whitespace */ } sequence[0].erase(sequence[0].begin()); sequence.erase(sequence.begin() + 1); if (sequence.size() > 1) nextsize = sequence[1].length() + 2; n++; } result[start] = modeline; return n; } irc::stringjoiner::stringjoiner(const std::string& separator, const std::vector& sequence, unsigned int begin, unsigned int end) { if (end < begin) return; // nothing to do here for (unsigned int v = begin; v < end; v++) joined.append(sequence[v]).append(separator); joined.append(sequence[end]); } irc::portparser::portparser(const std::string &source, bool allow_overlapped) : sep(source), in_range(0), range_begin(0), range_end(0), overlapped(allow_overlapped) { } bool irc::portparser::Overlaps(long val) { if (overlapped) return false; return (!overlap_set.insert(val).second); } long irc::portparser::GetToken() { if (in_range > 0) { in_range++; if (in_range <= range_end) { if (!Overlaps(in_range)) { return in_range; } else { while (((Overlaps(in_range)) && (in_range <= range_end))) in_range++; if (in_range <= range_end) return in_range; } } else in_range = 0; } std::string x; sep.GetToken(x); if (x.empty()) return 0; while (Overlaps(atoi(x.c_str()))) { if (!sep.GetToken(x)) return 0; } std::string::size_type dash = x.rfind('-'); if (dash != std::string::npos) { std::string sbegin = x.substr(0, dash); std::string send = x.substr(dash+1, x.length()); range_begin = atoi(sbegin.c_str()); range_end = atoi(send.c_str()); if ((range_begin > 0) && (range_end > 0) && (range_begin < 65536) && (range_end < 65536) && (range_begin < range_end)) { in_range = range_begin; return in_range; } else { /* Assume its just the one port */ return atoi(sbegin.c_str()); } } else { return atoi(x.c_str()); } }