1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26/*
27 * Extend regular expression matching for the file objects to allow
28 * multiple regular expressions (instead of just 1), and to not select
29 * regular expressions starting with a "~".  This will allow adminstrator
30 * to exclude uninteresting files from the audit trail.
31 */
32
33#include <stdlib.h>
34#include <string.h>
35#include <libgen.h>
36
37struct exp {
38	char *s;	/* The regular is expression */
39	int not;	/* Exclude if matched? */
40	char *comp;	/* The compiled regular expression */
41};
42
43static char SEP = ',';		/* separator used between reg exprs */
44static char NOT = '~';		/* Character used to exclude rex exprs */
45static int compile = 1;		/* Must we compile the expressions */
46
47static char *fexp = NULL;	/* full list of regular expressions */
48static int nexp = 1;		/* number of regular expressions in fexp */
49static struct exp *p_exp = NULL; /* list of individual expressions */
50
51char *
52re_comp2(s)
53	char *s;
54{
55	char *p;
56	int i;
57	static char *er = "regcmp: error";
58
59	compile = 1;
60	if (p_exp != NULL) {
61		for (i = 0; i < nexp; i++)
62			if (p_exp[i].comp != NULL)
63				free(p_exp[i].comp);
64		free(p_exp);
65	}
66	if (fexp != NULL) {
67		free(fexp);
68	}
69	fexp = strdup(s);
70	for (p = fexp, nexp = 1; *p != '\0'; p++) {
71		if (*p == SEP) {
72			nexp++;
73		}
74	}
75	p_exp = (struct exp *)malloc(nexp * sizeof (struct exp));
76	for (i = 0, p = fexp; *p != '\0'; i++) {
77		p_exp[i].comp = NULL;
78		if (*p == NOT) {
79			p++;
80			p_exp[i].not = 1;
81		} else {
82			p_exp[i].not = 0;
83		}
84		p_exp[i].s = p;
85		while (*p != SEP && *p != '\0')
86			p++;
87		if (*p == SEP) {
88			*p = '\0';
89			p++;
90		}
91		if (regcmp(p_exp[i].s, NULL) == NULL)
92			return (er);
93	}
94	return (NULL);
95}
96
97int
98re_exec2(s)
99	char *s;
100{
101	int i;
102	char *ret;
103
104	if (compile) {
105		for (i = 0; i < nexp; i++) {
106			if ((p_exp[i].comp = regcmp(p_exp[i].s, NULL)) == NULL)
107				return (-1);
108		}
109		compile = 0;
110	}
111	for (i = 0; i < nexp; i++) {
112		ret = regex(p_exp[i].comp, s);
113		if (ret != NULL) {
114			return (!p_exp[i].not);
115		}
116	}
117
118	/* no match and no more to check */
119	return (0);
120
121}
122