mirror of
https://github.com/jrbrtsn/ban2fail
synced 2024-06-16 11:58:01 +00:00
143 lines
4.3 KiB
C
143 lines
4.3 KiB
C
/***************************************************************************
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* Copyright (C) 2019 by John D. Robertson *
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* john@rrci.com *
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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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* *
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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, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#define _GNU_SOURCE
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#include <assert.h>
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#include <regex.h>
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#include <stdlib.h>
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#include "target.h"
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#include "util.h"
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int
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Target_init(Target *self, CFGMAP *h_map, const char *pfix)
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/********************************************************
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* Prepare for use from config map
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*/
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{
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int rtn= -1;
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memset(self, 0, sizeof(*self));
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self->flags |= TARGET_INIT_FLG;
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unsigned arr_sz= CFGMAP_numTuples(h_map);
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struct CFGMAP_tuple rtn_arr[arr_sz];
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size_t len= strlen(pfix)+1024;
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char symBuf[len];
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{ /*--- Check for "SEVERITY" symbol ---*/
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snprintf(symBuf, len, "%s\\SEVERITY", pfix);
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if(CFGMAP_query_last_uint(h_map, &self->severity, 0, symBuf)) {
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eprintf("ERROR: cannot interpret \"SEVERITY\" entry for REGEX %s", pfix);
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goto abort;
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}
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#ifdef qqDEBUG
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eprintf("%s = %u", symBuf, self->severity);
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#endif
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}
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{ /*--- Get all REGEX entries ---*/
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snprintf(symBuf, len, "%s\\REGEX", pfix);
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self->nRx= CFGMAP_find_tuples(h_map, rtn_arr, symBuf);
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self->rxArr= calloc(self->nRx, sizeof(struct TargetRx));
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assert(self->rxArr);
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for(unsigned i= 0; i < self->nRx; ++i) {
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const struct CFGMAP_tuple *tpl= rtn_arr + i;
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struct TargetRx *rx= self->rxArr + i;
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/* Compile regular expression */
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rx->pattern= tpl->value;
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if(regex_compile(&rx->re, rx->pattern, REG_EXTENDED)) {
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eprintf("ERROR: regex_compile(\"%s\") failed.", rx->pattern);
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goto abort;
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}
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}
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}
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rtn= 0;
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abort:
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return rtn;
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}
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void*
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Target_destructor(Target *self)
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/********************************************************
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* Free resources.
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*/
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{
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if(self->nRx && self->rxArr) {
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for(unsigned i= 0; i < self->nRx; ++i) {
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struct TargetRx *rx= self->rxArr + i;
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regfree(&rx->re);
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}
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free(self->rxArr);
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}
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return self;
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}
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int
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Target_scan(const Target *self, char *rsltBuf, unsigned buf_sz, const char *str)
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/********************************************************
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* Scan a string to obtain the address.
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*/
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{
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int rtn= EOF;
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/* Exit on first match */
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for(unsigned i= 0; i < self->nRx; ++i) {
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const struct TargetRx *rx= self->rxArr+i;
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regmatch_t matchArr[2];
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if(0 != regexec(&rx->re, str, 2, matchArr, 0) || -1 == matchArr[1].rm_so)
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continue;
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unsigned len= matchArr[1].rm_eo - matchArr[1].rm_so;
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strncpy(rsltBuf, str+matchArr[1].rm_so, buf_sz-1);
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rsltBuf[MIN(len, buf_sz-1)]= '\0';
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rtn= 0;
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break;
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}
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abort:
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return rtn;
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}
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int
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Target_MD5_update(const Target *self, MD5_CTX *ctx)
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/********************************************************
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* For computing MD5 checksum of cumulative patterns.
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*/
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{
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MD5_Update(ctx, &self->severity, sizeof(self->severity));
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for(unsigned i= 0; i < self->nRx; ++i) {
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const struct TargetRx *rx= self->rxArr+i;
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MD5_Update(ctx, rx->pattern, strlen(rx->pattern));
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}
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return 0;
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}
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