1/*	$NetBSD: revnetgroup.c,v 1.14 2009/04/19 06:06:40 lukem Exp $ */
2
3/*
4 * Copyright (c) 1995
5 *	Bill Paul <wpaul@ctr.columbia.edu>.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by Bill Paul.
18 * 4. Neither the name of the author nor the names of any co-contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * reverse netgroup map generator program
35 *
36 * Written by Bill Paul <wpaul@ctr.columbia.edu>
37 * Center for Telecommunications Research
38 * Columbia University, New York City
39 *
40 */
41
42#include <sys/cdefs.h>
43#ifndef lint
44__RCSID("$NetBSD: revnetgroup.c,v 1.14 2009/04/19 06:06:40 lukem Exp $");
45#endif
46
47#include <ctype.h>
48#include <err.h>
49#include <errno.h>
50#include <stdio.h>
51#include <stdlib.h>
52#include <string.h>
53#include <unistd.h>
54
55#include "hash.h"
56#include "protos.h"
57
58__dead static void	usage(void);
59
60
61
62/* Default location of netgroup file. */
63const char *netgroup = "/etc/netgroup";
64
65/* Stored hash table version of 'forward' netgroup database. */
66struct group_entry *gtable[TABLESIZE];
67
68/*
69 * Stored hash table of 'reverse' netgroup member database
70 * which we will construct.
71 */
72struct member_entry *mtable[TABLESIZE];
73
74static void
75usage(void)
76{
77
78	fprintf (stderr,"usage: %s -u|-h [-f netgroup file]\n", getprogname());
79	exit(1);
80}
81
82int
83main(int argc, char *argv[])
84{
85	struct group_entry *gcur;
86	struct member_entry *mcur;
87	FILE	*fp;
88	char	*line, *p, *host, *user, *domain;
89	int	 ch, i;
90	size_t	 len;
91	char	*key;
92	int	 hosts = -1;
93
94	if (argc < 2)
95		usage();
96
97	while ((ch = getopt(argc, argv, "uhf:")) != -1) {
98		switch(ch) {
99		case 'u':
100			if (hosts != -1) {
101				warnx("please use only one of -u or -h");
102				usage();
103			}
104			hosts = 0;
105			break;
106		case 'h':
107			if (hosts != -1) {
108				warnx("please use only one of -u or -h");
109				usage();
110			}
111			hosts = 1;
112			break;
113		case 'f':
114			netgroup = optarg;
115			break;
116		default:
117			usage();
118			break;
119		}
120	}
121
122	if (hosts == -1)
123		usage();
124
125	if (strcmp(netgroup, "-")) {
126		if ((fp = fopen(netgroup, "r")) == NULL) {
127			err(1, "%s", netgroup);
128		}
129	} else {
130		fp = stdin;
131	}
132
133	/* Stuff all the netgroup names and members into a hash table. */
134	for (;
135	    (line = fparseln(fp, &len, NULL, NULL, FPARSELN_UNESCALL));
136	    free(line)) {
137		if (len == 0)
138			continue;
139		p = line;
140
141		for (key = p; *p && isspace((unsigned char)*p) == 0; p++)
142			;
143		while (*p && isspace((unsigned char)*p))
144			*p++ = '\0';
145		store(gtable, key, p);
146	}
147
148	fclose(fp);
149
150	/*
151	 * Find all members of each netgroup and keep track of which
152	 * group they belong to.
153	 */
154	for (i = 0; i < TABLESIZE; i++) {
155		gcur = gtable[i];
156		while (gcur) {
157			rng_setnetgrent(gcur->key);
158			while (rng_getnetgrent(&host, &user, &domain) != 0) {
159				if (hosts) {
160					if (!(host && !strcmp(host,"-"))) {
161						mstore(mtable,
162						       host ? host : "*",
163						       gcur->key,
164						       domain ? domain : "*");
165					}
166				} else {
167					if (!(user && !strcmp(user,"-"))) {
168						mstore(mtable,
169						       user ? user : "*",
170						       gcur->key,
171						       domain ? domain : "*");
172					}
173				}
174			}
175			gcur = gcur->next;
176		}
177	}
178
179	/* Release resources used by the netgroup parser code. */
180	rng_endnetgrent();
181
182	/* Spew out the results. */
183	for (i = 0; i < TABLESIZE; i++) {
184		mcur = mtable[i];
185		while (mcur) {
186			struct grouplist *tmp;
187			printf ("%s.%s\t", mcur->key, mcur->domain);
188			tmp = mcur->groups;
189			while (tmp) {
190				printf ("%s", tmp->groupname);
191				tmp = tmp->next;
192				if (tmp)
193					printf(",");
194			}
195			mcur = mcur->next;
196			printf ("\n");
197		}
198	}
199
200	/* Let the OS free all our resources. */
201	exit(0);
202}
203