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// SPDX-License-Identifier: GPL-2.0-or-later
/* AS regular expression routine
* Copyright (C) 1999 Kunihiro Ishiguro
*/
#include <zebra.h>
#include "log.h"
#include "command.h"
#include "memory.h"
#include "queue.h"
#include "filter.h"
#include "bgpd.h"
#include "bgp_aspath.h"
#include "bgp_regex.h"
/* Character `_' has special mean. It represents [,{}() ] and the
beginning of the line(^) and the end of the line ($).
(^|[,{}() ]|$) */
regex_t *bgp_regcomp(const char *regstr)
{
/* Convert _ character to generic regular expression. */
int i, j;
int len;
int magic = 0;
char *magic_str;
char magic_regexp[] = "(^|[,{}() ]|$)";
int ret;
regex_t *regex;
len = strlen(regstr);
for (i = 0; i < len; i++)
if (regstr[i] == '_')
magic++;
magic_str = XMALLOC(MTYPE_TMP, len + (14 * magic) + 1);
for (i = 0, j = 0; i < len; i++) {
if (regstr[i] == '_') {
memcpy(magic_str + j, magic_regexp,
strlen(magic_regexp));
j += strlen(magic_regexp);
} else
magic_str[j++] = regstr[i];
}
magic_str[j] = '\0';
regex = XMALLOC(MTYPE_BGP_REGEXP, sizeof(regex_t));
ret = regcomp(regex, magic_str, REG_EXTENDED | REG_NOSUB);
XFREE(MTYPE_TMP, magic_str);
if (ret != 0) {
XFREE(MTYPE_BGP_REGEXP, regex);
return NULL;
}
return regex;
}
int bgp_regexec(regex_t *regex, struct aspath *aspath)
{
return regexec(regex, aspath->str, 0, NULL, 0);
}
void bgp_regex_free(regex_t *regex)
{
regfree(regex);
XFREE(MTYPE_BGP_REGEXP, regex);
}
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