/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * Extend regular expression matching for the file objects to allow
 * multiple regular expressions (instead of just 1), and to not select
 * regular expressions starting with a "~".  This will allow adminstrator
 * to exclude uninteresting files from the audit trail.
 */

#include <stdlib.h>
#include <string.h>
#include <libgen.h>

struct exp {
        char *s;        /* The regular is expression */
        int not;        /* Exclude if matched? */
        char *comp;     /* The compiled regular expression */
};

static char SEP = ',';          /* separator used between reg exprs */
static char NOT = '~';          /* Character used to exclude rex exprs */
static int compile = 1;         /* Must we compile the expressions */

static char *fexp = NULL;       /* full list of regular expressions */
static int nexp = 1;            /* number of regular expressions in fexp */
static struct exp *p_exp = NULL; /* list of individual expressions */

char *
re_comp2(s)
        char *s;
{
        char *p;
        int i;
        static char *er = "regcmp: error";

        compile = 1;
        if (p_exp != NULL) {
                for (i = 0; i < nexp; i++)
                        if (p_exp[i].comp != NULL)
                                free(p_exp[i].comp);
                free(p_exp);
        }
        if (fexp != NULL) {
                free(fexp);
        }
        fexp = strdup(s);
        for (p = fexp, nexp = 1; *p != '\0'; p++) {
                if (*p == SEP) {
                        nexp++;
                }
        }
        p_exp = (struct exp *)malloc(nexp * sizeof (struct exp));
        for (i = 0, p = fexp; *p != '\0'; i++) {
                p_exp[i].comp = NULL;
                if (*p == NOT) {
                        p++;
                        p_exp[i].not = 1;
                } else {
                        p_exp[i].not = 0;
                }
                p_exp[i].s = p;
                while (*p != SEP && *p != '\0')
                        p++;
                if (*p == SEP) {
                        *p = '\0';
                        p++;
                }
                if (regcmp(p_exp[i].s, NULL) == NULL)
                        return (er);
        }
        return (NULL);
}

int
re_exec2(s)
        char *s;
{
        int i;
        char *ret;

        if (compile) {
                for (i = 0; i < nexp; i++) {
                        if ((p_exp[i].comp = regcmp(p_exp[i].s, NULL)) == NULL)
                                return (-1);
                }
                compile = 0;
        }
        for (i = 0; i < nexp; i++) {
                ret = regex(p_exp[i].comp, s);
                if (ret != NULL) {
                        return (!p_exp[i].not);
                }
        }

        /* no match and no more to check */
        return (0);

}