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Annotation of embedaddon/quagga/bgpd/bgp_regex.c, revision 1.1.1.2

1.1       misho       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"
1.1.1.2 ! misho      26: #include "filter.h"
1.1       misho      27: 
                     28: #include "bgpd.h"
                     29: #include "bgp_aspath.h"
                     30: #include "bgp_regex.h"
                     31: 
                     32: /* Character `_' has special mean.  It represents [,{}() ] and the
                     33:    beginning of the line(^) and the end of the line ($).  
                     34: 
                     35:    (^|[,{}() ]|$) */
                     36: 
                     37: regex_t *
                     38: bgp_regcomp (const char *regstr)
                     39: {
                     40:   /* Convert _ character to generic regular expression. */
                     41:   int i, j;
                     42:   int len;
                     43:   int magic = 0;
                     44:   char *magic_str;
                     45:   char magic_regexp[] = "(^|[,{}() ]|$)";
                     46:   int ret;
                     47:   regex_t *regex;
                     48: 
                     49:   len = strlen (regstr);
                     50:   for (i = 0; i < len; i++)
                     51:     if (regstr[i] == '_')
                     52:       magic++;
                     53: 
                     54:   magic_str = XMALLOC (MTYPE_TMP, len + (14 * magic) + 1);
                     55:   
                     56:   for (i = 0, j = 0; i < len; i++)
                     57:     {
                     58:       if (regstr[i] == '_')
                     59:        {
                     60:          memcpy (magic_str + j, magic_regexp, strlen (magic_regexp));
                     61:          j += strlen (magic_regexp);
                     62:        }
                     63:       else
                     64:        magic_str[j++] = regstr[i];
                     65:     }
                     66:   magic_str[j] = '\0';
                     67: 
                     68:   regex = XMALLOC (MTYPE_BGP_REGEXP, sizeof (regex_t));
                     69: 
                     70:   ret = regcomp (regex, magic_str, REG_EXTENDED|REG_NOSUB);
                     71: 
                     72:   XFREE (MTYPE_TMP, magic_str);
                     73: 
                     74:   if (ret != 0)
                     75:     {
                     76:       XFREE (MTYPE_BGP_REGEXP, regex);
                     77:       return NULL;
                     78:     }
                     79: 
                     80:   return regex;
                     81: }
                     82: 
                     83: int
                     84: bgp_regexec (regex_t *regex, struct aspath *aspath)
                     85: {
                     86:   return regexec (regex, aspath->str, 0, NULL, 0);
                     87: }
                     88: 
                     89: void
                     90: bgp_regex_free (regex_t *regex)
                     91: {
                     92:   regfree (regex);
                     93:   XFREE (MTYPE_BGP_REGEXP, regex);
                     94: }