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Commit | Line | Data |
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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 | } |