106 lines
3.7 KiB
C
106 lines
3.7 KiB
C
/* Copyright (C) 2020 C. McEnroe <june@causal.agency>
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*
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* This program 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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* This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
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*
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* Additional permission under GNU GPL version 3 section 7:
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*
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* If you modify this Program, or any covered work, by linking or
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* combining it with OpenSSL (or a modified version of that library),
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* containing parts covered by the terms of the OpenSSL License and the
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* original SSLeay license, the licensors of this Program grant you
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* additional permission to convey the resulting work. Corresponding
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* Source for a non-source form of such a combination shall include the
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* source code for the parts of OpenSSL used as well as that of the
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* covered work.
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*/
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#include <err.h>
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#include <fnmatch.h>
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#include <stdbool.h>
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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 <sysexits.h>
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#include "chat.h"
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struct Filter filters[FilterCap];
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static size_t len;
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struct Filter filterParse(enum Heat heat, char *pattern) {
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struct Filter filter = { .heat = heat };
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filter.mask = strsep(&pattern, " ");
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filter.cmd = strsep(&pattern, " ");
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filter.chan = strsep(&pattern, " ");
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filter.mesg = pattern;
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return filter;
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}
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struct Filter filterAdd(enum Heat heat, const char *pattern) {
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if (len == FilterCap) errx(EX_CONFIG, "filter limit exceeded");
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char *own;
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if (!strchr(pattern, '!') && !strchr(pattern, ' ')) {
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int n = asprintf(&own, "%s!*@*", pattern);
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if (n < 0) err(EX_OSERR, "asprintf");
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} else {
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own = strdup(pattern);
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if (!own) err(EX_OSERR, "strdup");
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}
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struct Filter filter = filterParse(heat, own);
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filters[len++] = filter;
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return filter;
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}
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bool filterRemove(struct Filter filter) {
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bool found = false;
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for (size_t i = len - 1; i < len; --i) {
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if (filters[i].heat != filter.heat) continue;
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if (!filters[i].cmd != !filter.cmd) continue;
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if (!filters[i].chan != !filter.chan) continue;
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if (!filters[i].mesg != !filter.mesg) continue;
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if (strcasecmp(filters[i].mask, filter.mask)) continue;
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if (filter.cmd && strcasecmp(filters[i].cmd, filter.cmd)) continue;
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if (filter.chan && strcasecmp(filters[i].chan, filter.chan)) continue;
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if (filter.mesg && strcasecmp(filters[i].mesg, filter.mesg)) continue;
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free(filters[i].mask);
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memmove(&filters[i], &filters[i + 1], sizeof(*filters) * --len);
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filters[len] = (struct Filter) {0};
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found = true;
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}
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return found;
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}
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static bool filterTest(
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struct Filter filter, const char *mask, uint id, const struct Message *msg
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) {
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if (fnmatch(filter.mask, mask, FNM_CASEFOLD)) return false;
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if (!filter.cmd) return true;
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if (fnmatch(filter.cmd, msg->cmd, FNM_CASEFOLD)) return false;
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if (!filter.chan) return true;
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if (fnmatch(filter.chan, idNames[id], FNM_CASEFOLD)) return false;
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if (!filter.mesg) return true;
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if (!msg->params[1]) return false;
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return !fnmatch(filter.mesg, msg->params[1], FNM_CASEFOLD);
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}
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enum Heat filterCheck(enum Heat heat, uint id, const struct Message *msg) {
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if (!len) return heat;
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char mask[512];
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snprintf(mask, sizeof(mask), "%s!%s@%s", msg->nick, msg->user, msg->host);
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for (size_t i = 0; i < len; ++i) {
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if (filterTest(filters[i], mask, id, msg)) return filters[i].heat;
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}
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return heat;
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}
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