libexec/revnetgroup/revnetgroup.c

   1 /*
   2  * Copyright (c) 1995
   3  *      Bill Paul <wpaul@ctr.columbia.edu>.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by Bill Paul.
  16  * 4. Neither the name of the author nor the names of any co-contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * reverse netgroup map generator program
  33  *
  34  * Written by Bill Paul <wpaul@ctr.columbia.edu>
  35  * Center for Telecommunications Research
  36  * Columbia University, New York City
  37  *
  38  * $FreeBSD: src/libexec/revnetgroup/revnetgroup.c,v 1.10.2.1 2000/07/20 10:35:08 kris Exp $
  39  * $DragonFly: src/libexec/revnetgroup/revnetgroup.c,v 1.3 2008/11/19 17:46:55 swildner Exp $
  40  */
  41
  42 #include <err.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <unistd.h>
  47 #include "hash.h"
  48
  49 /* Default location of netgroup file. */
  50 const char *netgroup = "/etc/netgroup";
  51
  52 /* Stored hash table version of 'forward' netgroup database. */
  53 struct group_entry *gtable[TABLESIZE];
  54
  55 /*
  56  * Stored hash table of 'reverse' netgroup member database
  57  * which we will construct.
  58  */
  59 struct member_entry *mtable[TABLESIZE];
  60
  61 static void
  62 usage(void)
  63 {
  64         fprintf (stderr,"usage: revnetgroup -u|-h [-f netgroup file]\n");
  65         exit(1);
  66 }
  67
  68 int
  69 main(int argc, char *argv[])
  70 {
  71         FILE *fp;
  72         char readbuf[LINSIZ];
  73         struct group_entry *gcur;
  74         struct member_entry *mcur;
  75         char *host, *user, *domain;
  76         int ch;
  77         char *key = NULL, *data = NULL;
  78         int hosts = -1, i;
  79
  80         if (argc < 2)
  81                 usage();
  82
  83         while ((ch = getopt(argc, argv, "uhf:")) != -1) {
  84                 switch(ch) {
  85                 case 'u':
  86                         if (hosts != -1) {
  87                                 warnx("please use only one of -u or -h");
  88                                 usage();
  89                         }
  90                         hosts = 0;
  91                         break;
  92                 case 'h':
  93                         if (hosts != -1) {
  94                                 warnx("please use only one of -u or -h");
  95                                 usage();
  96                         }
  97                         hosts = 1;
  98                         break;
  99                 case 'f':
 100                         netgroup = optarg;
 101                         break;
 102                 default:
 103                         usage();
 104                         break;
 105                 }
 106         }
 107
 108         if (hosts == -1)
 109                 usage();
 110
 111         if (strcmp(netgroup, "-")) {
 112                 if ((fp = fopen(netgroup, "r")) == NULL) {
 113                         err(1, "%s", netgroup);
 114                 }
 115         } else {
 116                 fp = stdin;
 117         }
 118
 119         /* Stuff all the netgroup names and members into a hash table. */
 120         while (fgets(readbuf, LINSIZ, fp)) {
 121                 if (readbuf[0] == '#')
 122                         continue;
 123                 /* handle backslash line continuations */
 124                 while(readbuf[strlen(readbuf) - 2] == '\\') {
 125                         fgets((char *)&readbuf[strlen(readbuf) - 2],
 126                                         sizeof(readbuf) - strlen(readbuf), fp);
 127                 }
 128                 data = NULL;
 129                 if ((data = (char *)(strpbrk(readbuf, " \t") + 1)) < (char *)2)
 130                         continue;
 131                 key = (char *)&readbuf;
 132                 *(data - 1) = '\0';
 133                 store(gtable, key, data);
 134         }
 135
 136         fclose(fp);
 137
 138         /*
 139          * Find all members of each netgroup and keep track of which
 140          * group they belong to.
 141          */
 142         for (i = 0; i < TABLESIZE; i++) {
 143                 gcur = gtable[i];
 144                 while(gcur) {
 145                         __setnetgrent(gcur->key);
 146                         while(__getnetgrent(&host, &user, &domain) != 0) {
 147                                 if (hosts ? host && strcmp(host,"-") : user && strcmp(user, "-"))
 148                                         mstore(mtable, hosts ? host : user, gcur->key, domain);
 149                         }
 150                         gcur = gcur->next;
 151                 }
 152         }
 153
 154         /* Release resources used by the netgroup parser code. */
 155         __endnetgrent();
 156
 157         /* Spew out the results. */
 158         for (i = 0; i < TABLESIZE; i++) {
 159                 mcur = mtable[i];
 160                 while(mcur) {
 161                         struct grouplist *tmp;
 162                         printf ("%s.%s\t", mcur->key, mcur->domain);
 163                         tmp = mcur->groups;
 164                         while(tmp) {
 165                                 printf ("%s", tmp->groupname);
 166                                 tmp = tmp->next;
 167                                 if (tmp)
 168                                         printf(",");
 169                         }
 170                         mcur = mcur->next;
 171                         printf ("\n");
 172                 }
 173         }
 174
 175         /* Let the OS free all our resources. */
 176         exit(0);
 177 }