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