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Annotation of embedaddon/quagga/bgpd/bgp_regex.c, revision 1.1.1.1

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"
                     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 *
                     37: bgp_regcomp (const char *regstr)
                     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|REG_NOSUB);
                     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: }