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Annotation of embedaddon/quagga/bgpd/bgp_regex.c, revision 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: }