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 }
180