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/* SPDX-License-Identifier: GPL-3.0-or-later */
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/*
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* bwf
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* - bad words filter
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*
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* Copyright (C) 2004-2025 Leaflet <leaflet@leafok.com>
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*/
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#define PCRE2_CODE_UNIT_WIDTH 8
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#include "bwf.h"
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#include "log.h"
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#include <errno.h>
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#include <pcre2.h>
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#include <stdio.h>
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#include <string.h>
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enum _bwf_constant_t
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{
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BWF_max_pattern_len = 64,
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BWF_max_pattern_cnt = 1000,
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};
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static char bwf_pattern_str[(BWF_max_pattern_len + 1) * BWF_max_pattern_cnt];
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static pcre2_code *bwf_code = NULL;
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int bwf_load(const char *filename)
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{
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FILE *fp;
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char line[BWF_max_pattern_len + 1];
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size_t len_line;
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char *p = bwf_pattern_str;
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int line_id = 0;
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int errorcode;
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PCRE2_SIZE erroroffset;
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if (filename == NULL)
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{
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log_error("NULL pointer error\n");
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return -1;
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}
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if ((fp = fopen(filename, "r")) == NULL)
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{
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log_error("fopen(%s) error: %d\n", filename, errno);
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return -2;
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}
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while (fgets(line, sizeof(line), fp) != NULL)
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{
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len_line = strnlen(line, sizeof(line) - 1);
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if (!feof(fp) && line[len_line - 1] != '\n')
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{
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log_error("Data line %d (len=%d) is truncated\n", line_id, len_line);
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bwf_pattern_str[0] = '\0';
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return -3;
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}
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if (line[len_line - 1] == '\n')
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{
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line[len_line - 1] = '\0';
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}
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if (p > bwf_pattern_str)
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{
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*p++ = '|';
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}
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if (len_line + 2 > sizeof(bwf_pattern_str) - 1 - (size_t)(p - bwf_pattern_str))
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{
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log_error("Data in %s exceed length limit %d\n", filename, sizeof(bwf_pattern_str) - 1);
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bwf_pattern_str[0] = '\0';
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return -3;
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}
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*p++ = '(';
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p = mempcpy(p, line, strnlen(line, sizeof(bwf_pattern_str) - 1 - (size_t)(p - bwf_pattern_str)));
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*p++ = ')';
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line_id++;
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}
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*p = '\0';
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fclose(fp);
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#ifdef _DEBUG
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log_error("Debug: bwf_pattern_str: %s\n", bwf_pattern_str);
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#endif
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bwf_unload();
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bwf_code = pcre2_compile((PCRE2_SPTR)bwf_pattern_str, PCRE2_ZERO_TERMINATED, PCRE2_CASELESS, &errorcode, &erroroffset, NULL);
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if (bwf_code == NULL)
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{
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log_error("pcre2_compile() error: %d", errorcode);
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return -4;
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}
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return 0;
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}
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void bwf_unload(void)
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{
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if (bwf_code != NULL)
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{
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pcre2_code_free(bwf_code);
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bwf_code = NULL;
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}
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}
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int check_badwords(char *str, char c_mask)
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{
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pcre2_match_data *match_data;
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PCRE2_SIZE *ovector;
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int ret;
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int i;
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if (bwf_code == NULL)
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{
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log_error("BWF not loaded\n");
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return -1;
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}
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match_data = pcre2_match_data_create_from_pattern(bwf_code, NULL);
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ret = pcre2_match(bwf_code, (PCRE2_SPTR)str, PCRE2_ZERO_TERMINATED, 0, 0, match_data, NULL);
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if (ret == PCRE2_ERROR_NOMATCH)
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{
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ret = 0;
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}
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else if (ret < 0)
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{
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log_error("pcre2_match() error: %d\n", ret);
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}
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else if (ret == 0)
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{
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log_error("Vector of offsets is too small\n");
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}
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else // ret >= 1
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{
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ovector = pcre2_get_ovector_pointer(match_data);
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i = ret - 1;
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if (ovector[i * 2] == -1 || ovector[i * 2 + 1] == -1)
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{
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log_error("Bug: match pattern #%d with invalid offsets [%d, %d)",
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i, ovector[i * 2], ovector[i * 2 + 1]);
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ret = -2;
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}
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else
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{
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#ifdef _DEBUG
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log_error("Debug: match pattern #%d at offsets [%d, %d]\n",
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i, ovector[i * 2], ovector[i * 2 + 1] - ovector[i * 2]);
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#endif
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memset(str + ovector[i * 2], c_mask, ovector[i * 2 + 1] - ovector[i * 2]);
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}
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}
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pcre2_match_data_free(match_data);
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return ret;
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}
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