bgp_regex.c
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上传日期:2009-11-15
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文件大小:2k
- /* 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 (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] = ' ';
- 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);
- }