xref: /netbsd-src/usr.sbin/ypserv/stdhosts/stdhosts.c (revision 8583b49ce082ccbe527cf4f10d9b2a51415c1fda)
1 /*	$NetBSD: stdhosts.c,v 1.20 2011/08/30 21:10:29 joerg Exp $	 */
2 
3 /*
4  * Copyright (c) 1994 Mats O Jansson <moj@stacken.kth.se>
5  * 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  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
17  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
20  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26  * SUCH DAMAGE.
27  */
28 
29 #include <sys/cdefs.h>
30 #ifndef lint
31 __RCSID("$NetBSD: stdhosts.c,v 1.20 2011/08/30 21:10:29 joerg Exp $");
32 #endif
33 
34 #include <sys/types.h>
35 #include <sys/socket.h>
36 #include <netinet/in.h>
37 #include <arpa/inet.h>
38 #include <ctype.h>
39 #include <err.h>
40 #include <limits.h>
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <unistd.h>
45 #include <netdb.h>
46 
47 #include "protos.h"
48 
49 __dead static void	usage(void);
50 
51 int
main(int argc,char * argv[])52 main(int argc, char *argv[])
53 {
54 	struct in_addr host_addr;
55 	FILE	*data_file;
56 	size_t	 line_no;
57 	size_t	 len;
58 	char	*line, *k, *v, *addr_string;
59 	const char *fname;
60 	int	 ch;
61 	int	 af = 1 << 4;	/*IPv4*/
62 	struct addrinfo hints, *res;
63 
64 	addr_string = NULL;		/* XXX gcc -Wuninitialized */
65 
66 	while ((ch = getopt(argc, argv, "n")) != -1) {
67 		switch (ch) {
68 		case 'n':
69 			af |= 1 << 6;	/*IPv6*/
70 			break;
71 		default:
72 			usage();
73 			/* NOTREACHED */
74 		}
75 	}
76 	argc -= optind;
77 	argv += optind;
78 
79 	if (argc > 1)
80 		usage();
81 
82 	if (argc == 1) {
83 		fname = argv[0];
84 		data_file = fopen(fname, "r");
85 		if (data_file == NULL)
86 			err(1, "%s", fname);
87 	} else {
88 		fname = "<stdin>";
89 		data_file = stdin;
90 	}
91 
92 	line_no = 0;
93 	for (;
94 	    (line = fparseln(data_file, &len, &line_no, NULL,
95 		FPARSELN_UNESCALL));
96 	    free(line)) {
97 		if (len == 0)
98 			continue;
99 
100 		v = line;
101 		for (k = v; *v && !isspace((unsigned char)*v); v++)
102 			;
103 		while (*v && isspace((unsigned char)*v))
104 			*v++ = '\0';
105 
106 		memset(&hints, 0, sizeof(hints));
107 		hints.ai_socktype = SOCK_DGRAM;		/*dummy*/
108 		hints.ai_flags = AI_NUMERICHOST;
109 
110 		if ((af & (1 << 4)) != 0 && inet_aton(k, &host_addr) == 1 &&
111 		    (addr_string = inet_ntoa(host_addr)) != NULL) {
112 			/* IPv4 */
113 			printf("%s %s\n", addr_string, v);
114 		} else if ((af & (1 << 6)) != 0 &&
115 			   getaddrinfo(k, "0", &hints, &res) == 0) {
116 			/* IPv6, with scope extension permitted */
117 			freeaddrinfo(res);
118 			printf("%s %s\n", k, v);
119 		} else
120 			warnx("%s line %lu: syntax error", fname,
121 			    (unsigned long)line_no);
122 	}
123 
124 	exit(0);
125 }
126 
127 static void
usage(void)128 usage(void)
129 {
130 
131 	fprintf(stderr, "usage: %s [-n] [file]\n", getprogname());
132 	exit(1);
133 }
134