1/*	$NetBSD: getaddrinfo.c,v 1.4 2014/04/22 02:23:03 ginsbach Exp $	*/
2
3/*-
4 * Copyright (c) 2013 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Taylor R. Campbell.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD$");
34
35#include <sys/types.h>
36#include <sys/socket.h>
37
38#include <assert.h>
39#include <err.h>
40#include <errno.h>
41#include <limits.h>
42#include <netdb.h>
43#include <stdbool.h>
44#include <stdint.h>
45#include <stdlib.h>
46#include <stdio.h>
47#include <string.h>
48#include <unistd.h>
49#include <util.h>
50
51#include "tables.h"
52
53static void	usage(void) __dead;
54static void	printaddrinfo(struct addrinfo *);
55static bool	parse_af(const char *, int *);
56static bool	parse_protocol(const char *, int *);
57static bool	parse_socktype(const char *, int *);
58static bool	parse_numeric_tabular(const char *, int *, const char *const *,
59		    size_t);
60
61int
62main(int argc, char **argv)
63{
64	static const struct addrinfo zero_addrinfo;
65	struct addrinfo hints = zero_addrinfo;
66	struct addrinfo *addrinfo;
67	const char *hostname = NULL, *service = NULL;
68	int ch;
69	int error;
70
71	setprogname(argv[0]);
72
73	hints.ai_family = AF_UNSPEC;
74	hints.ai_socktype = 0;
75	hints.ai_protocol = 0;
76	hints.ai_flags = 0;
77
78	while ((ch = getopt(argc, argv, "cf:nNp:Ps:t:")) != -1) {
79		switch (ch) {
80		case 'c':
81			hints.ai_flags |= AI_CANONNAME;
82			break;
83
84		case 'f':
85			if (!parse_af(optarg, &hints.ai_family)) {
86				warnx("invalid address family: %s", optarg);
87				usage();
88			}
89			break;
90
91		case 'n':
92			hints.ai_flags |= AI_NUMERICHOST;
93			break;
94
95		case 'N':
96			hints.ai_flags |= AI_NUMERICSERV;
97			break;
98
99		case 's':
100			service = optarg;
101			break;
102
103		case 'p':
104			if (!parse_protocol(optarg, &hints.ai_protocol)) {
105				warnx("invalid protocol: %s", optarg);
106				usage();
107			}
108			break;
109
110		case 'P':
111			hints.ai_flags |= AI_PASSIVE;
112			break;
113
114		case 't':
115			if (!parse_socktype(optarg, &hints.ai_socktype)) {
116				warnx("invalid socket type: %s", optarg);
117				usage();
118			}
119			break;
120
121		case '?':
122		default:
123			usage();
124		}
125	}
126
127	argc -= optind;
128	argv += optind;
129
130	if (!((argc == 1) || ((argc == 0) && (hints.ai_flags & AI_PASSIVE))))
131		usage();
132	if (argc == 1)
133		hostname = argv[0];
134
135	if (service != NULL) {
136		char *p;
137
138		if ((p = strchr(service, '/')) != NULL) {
139			if (hints.ai_protocol != 0) {
140				warnx("protocol already specified");
141				usage();
142			}
143			*p = '\0';
144			p++;
145
146			if (!parse_protocol(p, &hints.ai_protocol)) {
147				warnx("invalid protocol: %s", p);
148				usage();
149			}
150		}
151	}
152
153	error = getaddrinfo(hostname, service, &hints, &addrinfo);
154	if (error)
155		errx(1, "%s", gai_strerror(error));
156
157	if ((hints.ai_flags & AI_CANONNAME) && (addrinfo != NULL)) {
158		if (printf("canonname %s\n", addrinfo->ai_canonname) < 0)
159			err(1, "printf");
160	}
161
162	printaddrinfo(addrinfo);
163
164	freeaddrinfo(addrinfo);
165
166	return 0;
167}
168
169static void __dead
170usage(void)
171{
172
173	(void)fprintf(stderr, "Usage: %s", getprogname());
174	(void)fprintf(stderr,
175	    " [-f <family>] [-p <protocol>] [-t <socktype>] [-s <service>]\n");
176	(void)fprintf(stderr, "   [-cnNP] [<hostname>]\n");
177	exit(1);
178}
179
180static bool
181parse_af(const char *string, int *afp)
182{
183
184	return parse_numeric_tabular(string, afp, address_families,
185	    __arraycount(address_families));
186}
187
188static bool
189parse_protocol(const char *string, int *protop)
190{
191	struct protoent *protoent;
192	char *end;
193	long value;
194
195	errno = 0;
196	value = strtol(string, &end, 0);
197	if ((string[0] == '\0') || (*end != '\0'))
198		goto numeric_failed;
199	if ((errno == ERANGE) && ((value == LONG_MAX) || (value == LONG_MIN)))
200		goto numeric_failed;
201	if ((value > INT_MAX) || (value < INT_MIN))
202		goto numeric_failed;
203
204	*protop = value;
205	return true;
206
207numeric_failed:
208	protoent = getprotobyname(string);
209	if (protoent == NULL)
210		goto protoent_failed;
211
212	*protop = protoent->p_proto;
213	return true;
214
215protoent_failed:
216	return false;
217}
218
219static bool
220parse_socktype(const char *string, int *typep)
221{
222
223	return parse_numeric_tabular(string, typep, socket_types,
224	    __arraycount(socket_types));
225}
226
227static bool
228parse_numeric_tabular(const char *string, int *valuep,
229    const char *const *table, size_t n)
230{
231	char *end;
232	long value;
233	size_t i;
234
235	assert((uintmax_t)n <= (uintmax_t)INT_MAX);
236
237	errno = 0;
238	value = strtol(string, &end, 0);
239	if ((string[0] == '\0') || (*end != '\0'))
240		goto numeric_failed;
241	if ((errno == ERANGE) && ((value == LONG_MAX) || (value == LONG_MIN)))
242		goto numeric_failed;
243	if ((value > INT_MAX) || (value < INT_MIN))
244		goto numeric_failed;
245
246	*valuep = value;
247	return true;
248
249numeric_failed:
250	for (i = 0; i < n; i++)
251		if ((table[i] != NULL) && (strcmp(string, table[i]) == 0))
252			break;
253	if (i == n)
254		goto table_failed;
255	*valuep = i;
256	return true;
257
258table_failed:
259	return false;
260}
261
262static void
263printaddrinfo(struct addrinfo *addrinfo)
264{
265	struct addrinfo *ai;
266	char buf[1024];
267	int n;
268	struct protoent *protoent;
269
270	for (ai = addrinfo; ai != NULL; ai = ai->ai_next) {
271		/* Print the socket type.  */
272		if ((ai->ai_socktype >= 0) &&
273		    ((size_t)ai->ai_socktype < __arraycount(socket_types)) &&
274		    (socket_types[ai->ai_socktype] != NULL))
275			n = printf("%s", socket_types[ai->ai_socktype]);
276		else
277			n = printf("%d", ai->ai_socktype);
278		if (n < 0)
279			err(1, "printf");
280
281		/* Print the address family.  */
282		if ((ai->ai_family >= 0) &&
283		    ((size_t)ai->ai_family < __arraycount(address_families)) &&
284		    (address_families[ai->ai_family] != NULL))
285			n = printf(" %s", address_families[ai->ai_family]);
286		else
287			n = printf(" %d", ai->ai_family);
288		if (n < 0)
289			err(1, "printf");
290
291		/* Print the protocol number.  */
292		protoent = getprotobynumber(ai->ai_protocol);
293		if (protoent == NULL)
294			n = printf(" %d", ai->ai_protocol);
295		else
296			n = printf(" %s", protoent->p_name);
297		if (n < 0)
298			err(1, "printf");
299
300		/* Format the sockaddr.  */
301		switch (ai->ai_family) {
302		case AF_INET:
303		case AF_INET6:
304			n = sockaddr_snprintf(buf, sizeof(buf), " %a %p",
305			    ai->ai_addr);
306			break;
307
308		default:
309			n = sockaddr_snprintf(buf, sizeof(buf),
310			    "%a %p %I %F %R %S", ai->ai_addr);
311		}
312
313		/*
314		 * Check for sockaddr_snprintf failure.
315		 *
316		 * XXX sockaddr_snprintf's error reporting is botched
317		 * -- man page says it sets errno, but if getnameinfo
318		 * fails, errno is not where it reports the error...
319		 */
320		if (n < 0) {
321			warnx("sockaddr_snprintf failed");
322			continue;
323		}
324		if (sizeof(buf) <= (size_t)n)
325			warnx("truncated sockaddr_snprintf output");
326
327		/* Print the formatted sockaddr.  */
328		if (printf("%s\n", buf) < 0)
329			err(1, "printf");
330	}
331}
332