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  */
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 static const 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
61 usage(void)
62 {
63 	fprintf (stderr,"usage: revnetgroup -u|-h [-f netgroup file]\n");
64 	exit(1);
65 }
66 
67 int
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