1 /* $OpenBSD: revnetgroup.c,v 1.9 2009/10/27 23:59:58 deraadt Exp $ */
2 /*
3  * Copyright (c) 1995
4  *	Bill Paul <wpaul@ctr.columbia.edu>.  All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  * 3. All advertising materials mentioning features or use of this software
15  *    must display the following acknowledgement:
16  *	This product includes software developed by Bill Paul.
17  * 4. Neither the name of the author nor the names of any co-contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  *
33  * reverse netgroup map generator program
34  *
35  * Written by Bill Paul <wpaul@ctr.columbia.edu>
36  * Center for Telecommunications Research
37  * Columbia University, New York City
38  *
39  *	$FreeBSD: revnetgroup.c,v 1.7 1997/03/28 15:48:15 imp Exp $
40  */
41 
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <util.h>
46 #include <errno.h>
47 #include <err.h>
48 #include "hash.h"
49 
50 /* Default location of netgroup file. */
51 char *netgroup = "/etc/netgroup";
52 
53 /* Stored hash table version of 'forward' netgroup database. */
54 struct group_entry *gtable[TABLESIZE];
55 
56 /*
57  * Stored hash table of 'reverse' netgroup member database
58  * which we will construct.
59  */
60 struct member_entry *mtable[TABLESIZE];
61 
62 static void
63 usage(void)
64 {
65 	fprintf (stderr,"usage: revnetgroup -h | -u [-f netgroup_file]\n");
66 	exit(1);
67 }
68 
69 int
70 main(int argc, char *argv[])
71 {
72 	FILE *fp;
73 	char *readbuf;
74 	struct group_entry *gcur;
75 	struct member_entry *mcur;
76 	char *host, *user, *domain;
77 	extern char *optarg;
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 -h or -u");
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 ((readbuf = fparseln(fp, NULL, NULL, NULL, 0)) != NULL) {
123 		data = strpbrk(readbuf, " \t");
124 		if (data == NULL) {
125 			free(readbuf);
126 			continue;
127 		}
128 		*data = '\0';
129 		++data;
130 		key = readbuf;
131 		ngstore(gtable, key, data);
132 		free(readbuf);
133 	}
134 
135 	fclose(fp);
136 
137 	/*
138 	 * Find all members of each netgroup and keep track of which
139 	 * group they belong to.
140 	 */
141 	for (i = 0; i < TABLESIZE; i++) {
142 		gcur = gtable[i];
143 		while (gcur) {
144 			__setnetgrent(gcur->key);
145 			while (__getnetgrent(&host, &user, &domain) != NULL) {
146 				if (hosts) {
147 					if (!(host && !strcmp(host,"-"))) {
148 						mstore(mtable,
149 						    host ? host : "*",
150 						    gcur->key,
151 						    domain ? domain : "*");
152 					}
153 				} else {
154 					if (!(user && !strcmp(user,"-"))) {
155 						mstore(mtable,
156 						    user ? user : "*",
157 						    gcur->key,
158 						    domain ? domain : "*");
159 					}
160 				}
161 			}
162 			gcur = gcur->next;
163 		}
164 	}
165 
166 	/* Release resources used by the netgroup parser code. */
167 	__endnetgrent();
168 
169 	/* Spew out the results. */
170 	for (i = 0; i < TABLESIZE; i++) {
171 		mcur = mtable[i];
172 		while (mcur) {
173 			struct grouplist *tmp;
174 			printf ("%s.%s\t", mcur->key, mcur->domain);
175 			tmp = mcur->groups;
176 			while (tmp) {
177 				printf ("%s", tmp->groupname);
178 				tmp = tmp->next;
179 				if (tmp)
180 					printf(",");
181 			}
182 			mcur = mcur->next;
183 			printf ("\n");
184 		}
185 	}
186 
187 	/* Let the OS free all our resources. */
188 	exit(0);
189 }
190