1 /*-
2 * SPDX-License-Identifier: BSD-4-Clause
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 #include <err.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <unistd.h>
46 #include "hash.h"
47
48 /* Default location of netgroup file. */
49 char *netgroup = "/etc/netgroup";
50
51 /* Stored hash table version of 'forward' netgroup database. */
52 struct group_entry *gtable[TABLESIZE];
53
54 /*
55 * Stored hash table of 'reverse' netgroup member database
56 * which we will construct.
57 */
58 struct member_entry *mtable[TABLESIZE];
59
60 static void
usage(void)61 usage(void)
62 {
63 fprintf (stderr,"usage: revnetgroup -u | -h [-f netgroup_file]\n");
64 exit(1);
65 }
66
67 int
main(int argc,char * argv[])68 main(int argc, char *argv[])
69 {
70 FILE *fp;
71 char readbuf[LINSIZ];
72 struct group_entry *gcur;
73 struct member_entry *mcur;
74 char *host, *user, *domain;
75 int ch;
76 char *key = NULL, *data = NULL;
77 int hosts = -1, i;
78
79 if (argc < 2)
80 usage();
81
82 while ((ch = getopt(argc, argv, "uhf:")) != -1) {
83 switch(ch) {
84 case 'u':
85 if (hosts != -1) {
86 warnx("please use only one of -u or -h");
87 usage();
88 }
89 hosts = 0;
90 break;
91 case 'h':
92 if (hosts != -1) {
93 warnx("please use only one of -u or -h");
94 usage();
95 }
96 hosts = 1;
97 break;
98 case 'f':
99 netgroup = optarg;
100 break;
101 default:
102 usage();
103 break;
104 }
105 }
106
107 if (hosts == -1)
108 usage();
109
110 if (strcmp(netgroup, "-")) {
111 if ((fp = fopen(netgroup, "r")) == NULL) {
112 err(1, "%s", netgroup);
113 }
114 } else {
115 fp = stdin;
116 }
117
118 /* Stuff all the netgroup names and members into a hash table. */
119 while (fgets(readbuf, LINSIZ, fp)) {
120 if (readbuf[0] == '#')
121 continue;
122 /* handle backslash line continuations */
123 while(readbuf[strlen(readbuf) - 2] == '\\') {
124 fgets((char *)&readbuf[strlen(readbuf) - 2],
125 sizeof(readbuf) - strlen(readbuf), fp);
126 }
127 data = NULL;
128 if ((data = (char *)(strpbrk(readbuf, " \t") + 1)) < (char *)2)
129 continue;
130 key = (char *)&readbuf;
131 *(data - 1) = '\0';
132 store(gtable, key, data);
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) != 0) {
146 if (hosts ? host && strcmp(host,"-") : user && strcmp(user, "-"))
147 mstore(mtable, hosts ? host : user, gcur->key, domain);
148 }
149 gcur = gcur->next;
150 }
151 }
152
153 /* Release resources used by the netgroup parser code. */
154 __endnetgrent();
155
156 /* Spew out the results. */
157 for (i = 0; i < TABLESIZE; i++) {
158 mcur = mtable[i];
159 while(mcur) {
160 struct grouplist *tmp;
161 printf ("%s.%s\t", mcur->key, mcur->domain);
162 tmp = mcur->groups;
163 while(tmp) {
164 printf ("%s", tmp->groupname);
165 tmp = tmp->next;
166 if (tmp)
167 printf(",");
168 }
169 mcur = mcur->next;
170 printf ("\n");
171 }
172 }
173
174 /* Let the OS free all our resources. */
175 exit(0);
176 }
177