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 1.2 2003/06/17 04:27:07 dillon 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 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()
  63 {
  64         fprintf (stderr,"usage: revnetgroup -u|-h [-f netgroup file]\n");
  65         exit(1);
  66 }
  67
  68 int
  69 main(argc, argv)
  70         int argc;
  71         char *argv[];
  72 {
  73         FILE *fp;
  74         char readbuf[LINSIZ];
  75         struct group_entry *gcur;
  76         struct member_entry *mcur;
  77         char *host, *user, *domain;
  78         int ch;
  79         char *key = NULL, *data = NULL;
  80         int hosts = -1, i;
  81
  82         if (argc < 2)
  83                 usage();
  84
  85         while ((ch = getopt(argc, argv, "uhf:")) != -1) {
  86                 switch(ch) {
  87                 case 'u':
  88                         if (hosts != -1) {
  89                                 warnx("please use only one of -u or -h");
  90                                 usage();
  91                         }
  92                         hosts = 0;
  93                         break;
  94                 case 'h':
  95                         if (hosts != -1) {
  96                                 warnx("please use only one of -u or -h");
  97                                 usage();
  98                         }
  99                         hosts = 1;
 100                         break;
 101                 case 'f':
 102                         netgroup = optarg;
 103                         break;
 104                 default:
 105                         usage();
 106                         break;
 107                 }
 108         }
 109
 110         if (hosts == -1)
 111                 usage();
 112
 113         if (strcmp(netgroup, "-")) {
 114                 if ((fp = fopen(netgroup, "r")) == NULL) {
 115                         err(1, "%s", netgroup);
 116                 }
 117         } else {
 118                 fp = stdin;
 119         }
 120
 121         /* Stuff all the netgroup names and members into a hash table. */
 122         while (fgets(readbuf, LINSIZ, fp)) {
 123                 if (readbuf[0] == '#')
 124                         continue;
 125                 /* handle backslash line continuations */
 126                 while(readbuf[strlen(readbuf) - 2] == '\\') {
 127                         fgets((char *)&readbuf[strlen(readbuf) - 2],
 128                                         sizeof(readbuf) - strlen(readbuf), fp);
 129                 }
 130                 data = NULL;
 131                 if ((data = (char *)(strpbrk(readbuf, " \t") + 1)) < (char *)2)
 132                         continue;
 133                 key = (char *)&readbuf;
 134                 *(data - 1) = '\0';
 135                 store(gtable, key, data);
 136         }
 137
 138         fclose(fp);
 139
 140         /*
 141          * Find all members of each netgroup and keep track of which
 142          * group they belong to.
 143          */
 144         for (i = 0; i < TABLESIZE; i++) {
 145                 gcur = gtable[i];
 146                 while(gcur) {
 147                         __setnetgrent(gcur->key);
 148                         while(__getnetgrent(&host, &user, &domain) != 0) {
 149                                 if (hosts ? host && strcmp(host,"-") : user && strcmp(user, "-"))
 150                                         mstore(mtable, hosts ? host : user, gcur->key, domain);
 151                         }
 152                         gcur = gcur->next;
 153                 }
 154         }
 155
 156         /* Release resources used by the netgroup parser code. */
 157         __endnetgrent();
 158
 159         /* Spew out the results. */
 160         for (i = 0; i < TABLESIZE; i++) {
 161                 mcur = mtable[i];
 162                 while(mcur) {
 163                         struct grouplist *tmp;
 164                         printf ("%s.%s\t", mcur->key, mcur->domain);
 165                         tmp = mcur->groups;
 166                         while(tmp) {
 167                                 printf ("%s", tmp->groupname);
 168                                 tmp = tmp->next;
 169                                 if (tmp)
 170                                         printf(",");
 171                         }
 172                         mcur = mcur->next;
 173                         printf ("\n");
 174                 }
 175         }
 176
 177         /* Let the OS free all our resources. */
 178         exit(0);
 179 }