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target.c
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target.c
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/***************************************************************************
* Copyright (C) 2019 by John D. Robertson *
* john@rrci.com *
* *
* This program 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; either version 3 of the License, or *
* (at your option) any later version. *
* *
* 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 *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#define _GNU_SOURCE
#include <assert.h>
#include <regex.h>
#include <stdlib.h>
#include "target.h"
#include "util.h"
int
Target_init(Target *self, CFGMAP *h_map, const char *pfix)
/********************************************************
* Prepare for use from config map
*/
{
int rtn= -1;
memset(self, 0, sizeof(*self));
self->flags |= TARGET_INIT_FLG;
unsigned arr_sz= CFGMAP_numTuples(h_map);
struct CFGMAP_tuple rtn_arr[arr_sz];
size_t len= strlen(pfix)+1024;
char symBuf[len];
{ /*--- Check for "SEVERITY" symbol ---*/
snprintf(symBuf, len, "%s\\SEVERITY", pfix);
if(CFGMAP_query_last_uint(h_map, &self->severity, 0, symBuf)) {
eprintf("ERROR: cannot interpret \"SEVERITY\" entry for REGEX %s", pfix);
goto abort;
}
#ifdef qqDEBUG
eprintf("%s = %u", symBuf, self->severity);
#endif
}
{ /*--- Get all REGEX entries ---*/
snprintf(symBuf, len, "%s\\REGEX", pfix);
self->nRx= CFGMAP_find_tuples(h_map, rtn_arr, symBuf);
self->rxArr= calloc(self->nRx, sizeof(struct TargetRx));
assert(self->rxArr);
for(unsigned i= 0; i < self->nRx; ++i) {
const struct CFGMAP_tuple *tpl= rtn_arr + i;
struct TargetRx *rx= self->rxArr + i;
/* Compile regular expression */
rx->pattern= tpl->value;
if(regex_compile(&rx->re, rx->pattern, REG_EXTENDED)) {
eprintf("ERROR: regex_compile(\"%s\") failed.", rx->pattern);
goto abort;
}
}
}
rtn= 0;
abort:
return rtn;
}
void*
Target_destructor(Target *self)
/********************************************************
* Free resources.
*/
{
if(self->nRx && self->rxArr) {
for(unsigned i= 0; i < self->nRx; ++i) {
struct TargetRx *rx= self->rxArr + i;
regfree(&rx->re);
}
free(self->rxArr);
}
return self;
}
int
Target_scan(const Target *self, char *rsltBuf, unsigned buf_sz, const char *str)
/********************************************************
* Scan a string to obtain the address.
*/
{
int rtn= EOF;
/* Exit on first match */
for(unsigned i= 0; i < self->nRx; ++i) {
const struct TargetRx *rx= self->rxArr+i;
regmatch_t matchArr[2];
if(0 != regexec(&rx->re, str, 2, matchArr, 0) || -1 == matchArr[1].rm_so)
continue;
unsigned len= matchArr[1].rm_eo - matchArr[1].rm_so;
strncpy(rsltBuf, str+matchArr[1].rm_so, buf_sz-1);
rsltBuf[MIN(len, buf_sz-1)]= '\0';
rtn= 0;
break;
}
abort:
return rtn;
}
int
Target_MD5_update(const Target *self, MD5_CTX *ctx)
/********************************************************
* For computing MD5 checksum of cumulative patterns.
*/
{
MD5_Update(ctx, &self->severity, sizeof(self->severity));
for(unsigned i= 0; i < self->nRx; ++i) {
const struct TargetRx *rx= self->rxArr+i;
MD5_Update(ctx, rx->pattern, strlen(rx->pattern));
}
return 0;
}