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 1.3 2008/11/19 17:46:55 swildner 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 const 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(void)
63 {
64 	fprintf (stderr,"usage: revnetgroup -u|-h [-f netgroup file]\n");
65 	exit(1);
66 }
67 
68 int
69 main(int argc, char *argv[])
70 {
71 	FILE *fp;
72 	char readbuf[LINSIZ];
73 	struct group_entry *gcur;
74 	struct member_entry *mcur;
75 	char *host, *user, *domain;
76 	int ch;
77 	char *key = NULL, *data = NULL;
78 	int hosts = -1, i;
79 
80 	if (argc < 2)
81 		usage();
82 
83 	while ((ch = getopt(argc, argv, "uhf:")) != -1) {
84 		switch(ch) {
85 		case 'u':
86 			if (hosts != -1) {
87 				warnx("please use only one of -u or -h");
88 				usage();
89 			}
90 			hosts = 0;
91 			break;
92 		case 'h':
93 			if (hosts != -1) {
94 				warnx("please use only one of -u or -h");
95 				usage();
96 			}
97 			hosts = 1;
98 			break;
99 		case 'f':
100 			netgroup = optarg;
101 			break;
102 		default:
103 			usage();
104 			break;
105 		}
106 	}
107 
108 	if (hosts == -1)
109 		usage();
110 
111 	if (strcmp(netgroup, "-")) {
112 		if ((fp = fopen(netgroup, "r")) == NULL) {
113 			err(1, "%s", netgroup);
114 		}
115 	} else {
116 		fp = stdin;
117 	}
118 
119 	/* Stuff all the netgroup names and members into a hash table. */
120 	while (fgets(readbuf, LINSIZ, fp)) {
121 		if (readbuf[0] == '#')
122 			continue;
123 		/* handle backslash line continuations */
124 		while(readbuf[strlen(readbuf) - 2] == '\\') {
125 			fgets((char *)&readbuf[strlen(readbuf) - 2],
126 					sizeof(readbuf) - strlen(readbuf), fp);
127 		}
128 		data = NULL;
129 		if ((data = (char *)(strpbrk(readbuf, " \t") + 1)) < (char *)2)
130 			continue;
131 		key = (char *)&readbuf;
132 		*(data - 1) = '\0';
133 		store(gtable, key, data);
134 	}
135 
136 	fclose(fp);
137 
138 	/*
139 	 * Find all members of each netgroup and keep track of which
140 	 * group they belong to.
141 	 */
142 	for (i = 0; i < TABLESIZE; i++) {
143 		gcur = gtable[i];
144 		while(gcur) {
145 			__setnetgrent(gcur->key);
146 			while(__getnetgrent(&host, &user, &domain) != 0) {
147 				if (hosts ? host && strcmp(host,"-") : user && strcmp(user, "-"))
148 					mstore(mtable, hosts ? host : user, gcur->key, domain);
149 			}
150 			gcur = gcur->next;
151 		}
152 	}
153 
154 	/* Release resources used by the netgroup parser code. */
155 	__endnetgrent();
156 
157 	/* Spew out the results. */
158 	for (i = 0; i < TABLESIZE; i++) {
159 		mcur = mtable[i];
160 		while(mcur) {
161 			struct grouplist *tmp;
162 			printf ("%s.%s\t", mcur->key, mcur->domain);
163 			tmp = mcur->groups;
164 			while(tmp) {
165 				printf ("%s", tmp->groupname);
166 				tmp = tmp->next;
167 				if (tmp)
168 					printf(",");
169 			}
170 			mcur = mcur->next;
171 			printf ("\n");
172 		}
173 	}
174 
175 	/* Let the OS free all our resources. */
176 	exit(0);
177 }
178