[mirror_frr.git] / bgpd / bgp_regex.c

/* AS regular expression routine
   Copyright (C) 1999 Kunihiro Ishiguro

This file is part of GNU Zebra.

GNU Zebra 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 2, or (at your option) any
later version.

GNU Zebra 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 GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Zebra; see the file COPYING.  If not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.  */

#include <zebra.h>

#include "log.h"
#include "command.h"
#include "memory.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);

  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);
}
Commit	Line	Data
718e3744	1	/* AS regular expression routine
	2	Copyright (C) 1999 Kunihiro Ishiguro
	3
	4	This file is part of GNU Zebra.
	5
	6	GNU Zebra is free software; you can redistribute it and/or modify it
	7	under the terms of the GNU General Public License as published by the
	8	Free Software Foundation; either version 2, or (at your option) any
	9	later version.
	10
	11	GNU Zebra is distributed in the hope that it will be useful, but
	12	WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with GNU Zebra; see the file COPYING. If not, write to the Free
	18	Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
	19	02111-1307, USA. */
	20
	21	#include <zebra.h>
	22
	23	#include "log.h"
	24	#include "command.h"
	25	#include "memory.h"
	26
	27	#include "bgpd.h"
	28	#include "bgp_aspath.h"
	29	#include "bgp_regex.h"
	30
	31	/* Character `_' has special mean. It represents [,{}() ] and the
	32	beginning of the line(^) and the end of the line ($).
	33
	34	(^\|[,{}() ]\|$) */
	35
	36	regex_t *
fd79ac91	37	bgp_regcomp (const char *regstr)
718e3744	38	{
	39	/* Convert _ character to generic regular expression. */
	40	int i, j;
	41	int len;
	42	int magic = 0;
	43	char *magic_str;
	44	char magic_regexp[] = "(^\|[,{}() ]\|$)";
	45	int ret;
	46	regex_t *regex;
	47
	48	len = strlen (regstr);
	49	for (i = 0; i < len; i++)
	50	if (regstr[i] == '_')
	51	magic++;
	52
	53	magic_str = XMALLOC (MTYPE_TMP, len + (14 * magic) + 1);
	54
	55	for (i = 0, j = 0; i < len; i++)
	56	{
	57	if (regstr[i] == '_')
	58	{
	59	memcpy (magic_str + j, magic_regexp, strlen (magic_regexp));
	60	j += strlen (magic_regexp);
	61	}
	62	else
	63	magic_str[j++] = regstr[i];
	64	}
	65	magic_str[j] = '\0';
	66
	67	regex = XMALLOC (MTYPE_BGP_REGEXP, sizeof (regex_t));
	68
	69	ret = regcomp (regex, magic_str, REG_EXTENDED);
	70
	71	XFREE (MTYPE_TMP, magic_str);
	72
	73	if (ret != 0)
	74	{
	75	XFREE (MTYPE_BGP_REGEXP, regex);
	76	return NULL;
	77	}
	78
	79	return regex;
	80	}
	81
	82	int
	83	bgp_regexec (regex_t regex, struct aspath aspath)
	84	{
	85	return regexec (regex, aspath->str, 0, NULL, 0);
	86	}
	87
	88	void
	89	bgp_regex_free (regex_t *regex)
	90	{
	91	regfree (regex);
	92	XFREE (MTYPE_BGP_REGEXP, regex);
	93	}