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      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, Version 1.0 only
      6  * (the "License").  You may not use this file except in compliance
      7  * with the License.
      8  *
      9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
     10  * or http://www.opensolaris.org/os/licensing.
     11  * See the License for the specific language governing permissions
     12  * and limitations under the License.
     13  *
     14  * When distributing Covered Code, include this CDDL HEADER in each
     15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     16  * If applicable, add the following below this CDDL HEADER, with the
     17  * fields enclosed by brackets "[]" replaced with your own identifying
     18  * information: Portions Copyright [yyyy] [name of copyright owner]
     19  *
     20  * CDDL HEADER END
     21  */
     22 /*
     23  * Copyright 1993,1998,2001-2002 Sun Microsystems, Inc.
     24  * All rights reserved.
     25  * Use is subject to license terms.
     26  */
     27 
     28 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     29 
     30 /*
     31  * Extend regular expression matching for the file objects to allow
     32  * multiple regular expressions (instead of just 1), and to not select
     33  * regular expressions starting with a "~".  This will allow adminstrator
     34  * to exclude uninteresting files from the audit trail.
     35  */
     36 
     37 #include <stdlib.h>
     38 #include <string.h>
     39 #include <libgen.h>
     40 
     41 struct exp {
     42 	char *s;	/* The regular is expression */
     43 	int not;	/* Exclude if matched? */
     44 	char *comp;	/* The compiled regular expression */
     45 };
     46 
     47 static char SEP = ',';		/* separator used between reg exprs */
     48 static char NOT = '~';		/* Character used to exclude rex exprs */
     49 static int compile = 1;		/* Must we compile the expressions */
     50 
     51 static char *fexp = NULL;	/* full list of regular expressions */
     52 static int nexp = 1;		/* number of regular expressions in fexp */
     53 static struct exp *p_exp = NULL; /* list of individual expressions */
     54 
     55 char *
     56 re_comp2(s)
     57 	char *s;
     58 {
     59 	char *p;
     60 	int i;
     61 	static char *er = "regcmp: error";
     62 
     63 	compile = 1;
     64 	if (p_exp != NULL) {
     65 		for (i = 0; i < nexp; i++)
     66 			if (p_exp[i].comp != NULL)
     67 				free(p_exp[i].comp);
     68 		free(p_exp);
     69 	}
     70 	if (fexp != NULL) {
     71 		free(fexp);
     72 	}
     73 	fexp = strdup(s);
     74 	for (p = fexp, nexp = 1; *p != '\0'; p++) {
     75 		if (*p == SEP) {
     76 			nexp++;
     77 		}
     78 	}
     79 	p_exp = (struct exp *)malloc(nexp * sizeof (struct exp));
     80 	for (i = 0, p = fexp; *p != '\0'; i++) {
     81 		p_exp[i].comp = NULL;
     82 		if (*p == NOT) {
     83 			p++;
     84 			p_exp[i].not = 1;
     85 		} else {
     86 			p_exp[i].not = 0;
     87 		}
     88 		p_exp[i].s = p;
     89 		while (*p != SEP && *p != '\0')
     90 			p++;
     91 		if (*p == SEP) {
     92 			*p = '\0';
     93 			p++;
     94 		}
     95 		if (regcmp(p_exp[i].s, NULL) == NULL)
     96 			return (er);
     97 	}
     98 	return (NULL);
     99 }
    100 
    101 int
    102 re_exec2(s)
    103 	char *s;
    104 {
    105 	int i;
    106 	char *ret;
    107 
    108 	if (compile) {
    109 		for (i = 0; i < nexp; i++) {
    110 			if ((p_exp[i].comp = regcmp(p_exp[i].s, NULL)) == NULL)
    111 				return (-1);
    112 		}
    113 		compile = 0;
    114 	}
    115 	for (i = 0; i < nexp; i++) {
    116 		ret = regex(p_exp[i].comp, s);
    117 		if (ret != NULL) {
    118 			return (!p_exp[i].not);
    119 		}
    120 	}
    121 
    122 	/* no match and no more to check */
    123 	return (0);
    124 
    125 }
    126 
    127 #ifdef DEBUG
    128 re_debug_print()
    129 {
    130 	int i;
    131 
    132 	if (p_exp == NULL) {
    133 		(void) printf("Expression is NULL\n");
    134 		return;
    135 	}
    136 	for (i = 0; i < nexp; i++) {
    137 		(void) printf("exp #%d:", i+1);
    138 		if (p_exp[i].not)
    139 			(void) putchar('~');
    140 		(void) printf("%s\n", p_exp[i].s);
    141 	}
    142 }
    143 #endif /* DEBUG */
    144