usr/src/cmd/auditreduce/regex2.c

   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
  37 struct exp {
  38         char *s;        /* The regular is expression */
  39         int not;        /* Exclude if matched? */
  40         char *comp;     /* The compiled regular expression */
  41 };
  42
  43 static char SEP = ',';          /* separator used between reg exprs */
  44 static char NOT = '~';          /* Character used to exclude rex exprs */
  45 static int compile = 1;         /* Must we compile the expressions */
  46
  47 static char *fexp = NULL;       /* full list of regular expressions */
  48 static int nexp = 1;            /* number of regular expressions in fexp */
  49 static struct exp *p_exp = NULL; /* list of individual expressions */
  50
  51 char *
  52 re_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                         free(p_exp[i].comp);
  63                 free(p_exp);
  64         }
  65         if (fexp != NULL) {
  66                 free(fexp);
  67         }
  68         fexp = strdup(s);
  69         for (p = fexp, nexp = 1; *p != '\0'; p++) {
  70                 if (*p == SEP) {
  71                         nexp++;
  72                 }
  73         }
  74         p_exp = (struct exp *)malloc(nexp * sizeof (struct exp));
  75         for (i = 0, p = fexp; *p != '\0'; i++) {
  76                 p_exp[i].comp = NULL;
  77                 if (*p == NOT) {
  78                         p++;
  79                         p_exp[i].not = 1;
  80                 } else {
  81                         p_exp[i].not = 0;
  82                 }
  83                 p_exp[i].s = p;
  84                 while (*p != SEP && *p != '\0')
  85                         p++;
  86                 if (*p == SEP) {
  87                         *p = '\0';
  88                         p++;
  89                 }
  90                 if (regcmp(p_exp[i].s, NULL) == NULL)
  91                         return (er);
  92         }
  93         return (NULL);
  94 }
  95
  96 int
  97 re_exec2(s)
  98         char *s;
  99 {
 100         int i;
 101         char *ret;
 102
 103         if (compile) {
 104                 for (i = 0; i < nexp; i++) {
 105                         if ((p_exp[i].comp = regcmp(p_exp[i].s, NULL)) == NULL)
 106                                 return (-1);
 107                 }
 108                 compile = 0;
 109         }
 110         for (i = 0; i < nexp; i++) {
 111                 ret = regex(p_exp[i].comp, s);
 112                 if (ret != NULL) {
 113                         return (!p_exp[i].not);
 114                 }
 115         }
 116
 117         /* no match and no more to check */
 118         return (0);
 119
 120 }