154 lines
3.7 KiB
C
154 lines
3.7 KiB
C
/*
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* Copyright(c) 2014 Tim Ruehsen
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*
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* This file is part of MGet.
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*
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* Mget is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Mget is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Mget. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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* Public Suffix List routines (right now experimental)
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*
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* Changelog
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* 22.03.2014 Tim Ruehsen created
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*
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*/
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// need _GNU_SOURCE for qsort_r()
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#ifndef _GNU_SOURCE
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# define _GNU_SOURCE
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#endif
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <libpsl-inline.h>
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#define countof(a) (sizeof(a)/sizeof(*(a)))
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typedef struct {
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char
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label_buf[42];
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const char *
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label;
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unsigned short
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length;
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unsigned char
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nlabels, // number of labels
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wildcard; // this is a wildcard rule (e.g. *.sapporo.jp)
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} _psl_entry_t;
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#include "suffixes.c"
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// by this kind of sorting, we can easily see if a domain matches or not (match = supercookie !)
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static int _suffix_compare(const _psl_entry_t *s1, const _psl_entry_t *s2)
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{
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int n;
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if ((n = s2->nlabels - s1->nlabels))
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return n; // most labels first
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if ((n = s1->length - s2->length))
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return n; // shorter rules first
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return strcmp(s1->label, s2->label);
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}
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void psl_inline_init(void)
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{
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size_t it;
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for (it = 0; it < countof(suffixes); it++)
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suffixes[it].label = suffixes[it].label_buf;
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for (it = 0; it < countof(suffix_exceptions); it++)
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suffix_exceptions[it].label = suffix_exceptions[it].label_buf;
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}
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void psl_inline_deinit(void)
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{
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}
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int psl_inline_is_public(const char *domain)
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{
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_psl_entry_t suffix, *rule;
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const char *p, *label_bak;
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unsigned short length_bak;
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// this function should be called without leading dots, just make sure
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suffix.label = domain + (*domain == '.');
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suffix.length = strlen(suffix.label);
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suffix.wildcard = 0;
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suffix.nlabels = 1;
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for (p = suffix.label; *p; p++)
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if (*p == '.')
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suffix.nlabels++;
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// if domain has enough labels, it won't match
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rule = &suffixes[0];
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if (!rule || rule->nlabels < suffix.nlabels - 1)
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return 0;
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rule = bsearch(&suffix, suffixes, countof(suffixes), sizeof(suffixes[0]), (int(*)(const void *, const void *))_suffix_compare);
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if (rule) {
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// definitely a match, no matter if the found rule is a wildcard or not
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return 1;
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}
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label_bak = suffix.label;
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length_bak = suffix.length;
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if ((suffix.label = strchr(suffix.label, '.'))) {
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suffix.label++;
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suffix.length = strlen(suffix.label);
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suffix.nlabels--;
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rule = bsearch(&suffix, suffixes, countof(suffixes), sizeof(suffixes[0]), (int(*)(const void *, const void *))_suffix_compare);
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if (rule) {
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if (rule->wildcard) {
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// now that we matched a wildcard, we have to check for an exception
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suffix.label = label_bak;
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suffix.length = length_bak;
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suffix.nlabels++;
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if (bsearch(&suffix, suffix_exceptions, countof(suffix_exceptions), sizeof(suffix_exceptions[0]), (int(*)(const void *, const void *))_suffix_compare))
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return 0; // found an exception, so 'domain' is not a public suffix
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return 1;
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}
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}
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}
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return 0;
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}
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/* does not include exceptions */
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int psl_inline_suffix_count(void)
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{
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return countof(suffixes);
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}
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/* just counts exceptions */
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int psl_inline_suffix_exception_count(void)
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{
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return countof(suffix_exceptions);
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}
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