1/*
2 * Copyright (C) 2009  Internet Systems Consortium, Inc. ("ISC")
3 *
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
9 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
10 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
11 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
12 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
13 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
14 * PERFORMANCE OF THIS SOFTWARE.
15 */
16
17/* $Id: sample.c,v 1.5 2009/09/29 15:06:07 fdupont Exp $ */
18
19#include <config.h>
20
21#include <sys/types.h>
22#include <sys/socket.h>
23
24#include <netinet/in.h>
25
26#include <arpa/inet.h>
27
28#include <unistd.h>
29#include <stdio.h>
30#include <stdlib.h>
31#include <string.h>
32#include <netdb.h>
33
34#include <isc/base64.h>
35#include <isc/buffer.h>
36#include <isc/lib.h>
37#include <isc/mem.h>
38#include <isc/sockaddr.h>
39#include <isc/util.h>
40
41#include <dns/client.h>
42#include <dns/fixedname.h>
43#include <dns/keyvalues.h>
44#include <dns/lib.h>
45#include <dns/name.h>
46#include <dns/rdata.h>
47#include <dns/rdataset.h>
48#include <dns/rdatastruct.h>
49#include <dns/rdatatype.h>
50#include <dns/result.h>
51#include <dns/secalg.h>
52
53#include <dst/dst.h>
54
55static char *algname;
56
57static isc_result_t
58printdata(dns_rdataset_t *rdataset, dns_name_t *owner) {
59	isc_buffer_t target;
60	isc_result_t result;
61	isc_region_t r;
62	char t[4096];
63
64	if (!dns_rdataset_isassociated(rdataset)) {
65		printf("[WARN: empty]\n");
66		return (ISC_R_SUCCESS);
67	}
68
69	isc_buffer_init(&target, t, sizeof(t));
70
71	result = dns_rdataset_totext(rdataset, owner, ISC_FALSE, ISC_FALSE,
72				     &target);
73	if (result != ISC_R_SUCCESS)
74		return (result);
75	isc_buffer_usedregion(&target, &r);
76	printf("%.*s", (int)r.length, (char *)r.base);
77
78	return (ISC_R_SUCCESS);
79}
80
81ISC_PLATFORM_NORETURN_PRE static void
82usage(void) ISC_PLATFORM_NORETURN_POST;
83
84static void
85usage(void) {
86	fprintf(stderr, "sample [-t RRtype] "
87		"[[-a algorithm] [-e] -k keyname -K keystring] "
88		"[-s domain:serveraddr_for_domain ] "
89		"server_address hostname\n");
90
91	exit(1);
92}
93
94static void
95set_key(dns_client_t *client, char *keynamestr, char *keystr,
96	isc_boolean_t is_sep, isc_mem_t **mctxp)
97{
98	isc_result_t result;
99	dns_fixedname_t fkeyname;
100	size_t namelen;
101	dns_name_t *keyname;
102	dns_rdata_dnskey_t keystruct;
103	unsigned char keydata[4096];
104	isc_buffer_t keydatabuf;
105	unsigned char rrdata[4096];
106	isc_buffer_t rrdatabuf;
107	isc_buffer_t b;
108	isc_textregion_t tr;
109	isc_region_t r;
110	dns_secalg_t alg;
111
112	result = isc_mem_create(0, 0, mctxp);
113	if (result != ISC_R_SUCCESS) {
114		fprintf(stderr, "failed to crate mctx\n");
115		exit(1);
116	}
117
118	if (algname != NULL) {
119		tr.base = algname;
120		tr.length = strlen(algname);
121		result = dns_secalg_fromtext(&alg, &tr);
122		if (result != ISC_R_SUCCESS) {
123			fprintf(stderr, "failed to identify the algorithm\n");
124			exit(1);
125		}
126	} else
127		alg = DNS_KEYALG_RSASHA1;
128
129	keystruct.common.rdclass = dns_rdataclass_in;
130	keystruct.common.rdtype = dns_rdatatype_dnskey;
131	keystruct.flags = DNS_KEYOWNER_ZONE; /* fixed */
132	if (is_sep)
133		keystruct.flags |= DNS_KEYFLAG_KSK;
134	keystruct.protocol = DNS_KEYPROTO_DNSSEC; /* fixed */
135	keystruct.algorithm = alg;
136
137	isc_buffer_init(&keydatabuf, keydata, sizeof(keydata));
138	isc_buffer_init(&rrdatabuf, rrdata, sizeof(rrdata));
139	result = isc_base64_decodestring(keystr, &keydatabuf);
140	if (result != ISC_R_SUCCESS) {
141		fprintf(stderr, "base64 decode failed\n");
142		exit(1);
143	}
144	isc_buffer_usedregion(&keydatabuf, &r);
145	keystruct.datalen = r.length;
146	keystruct.data = r.base;
147
148	result = dns_rdata_fromstruct(NULL, keystruct.common.rdclass,
149				      keystruct.common.rdtype,
150				      &keystruct, &rrdatabuf);
151	if (result != ISC_R_SUCCESS) {
152		fprintf(stderr, "failed to construct key rdata\n");
153		exit(1);
154	}
155	namelen = strlen(keynamestr);
156	isc_buffer_init(&b, keynamestr, namelen);
157	isc_buffer_add(&b, namelen);
158	dns_fixedname_init(&fkeyname);
159	keyname = dns_fixedname_name(&fkeyname);
160	result = dns_name_fromtext(keyname, &b, dns_rootname, 0, NULL);
161	if (result != ISC_R_SUCCESS) {
162		fprintf(stderr, "failed to construct key name\n");
163		exit(1);
164	}
165	result = dns_client_addtrustedkey(client, dns_rdataclass_in,
166					  keyname, &rrdatabuf);
167	if (result != ISC_R_SUCCESS) {
168		fprintf(stderr, "failed to add key for %s\n",
169			keynamestr);
170		exit(1);
171	}
172}
173
174static void
175addserver(dns_client_t *client, const char *addrstr, const char *namespace) {
176	struct addrinfo hints, *res;
177	int gai_error;
178	isc_sockaddr_t sa;
179	isc_sockaddrlist_t servers;
180	isc_result_t result;
181	size_t namelen;
182	isc_buffer_t b;
183	dns_fixedname_t fname;
184	dns_name_t *name = NULL;
185
186	memset(&hints, 0, sizeof(hints));
187	hints.ai_family = AF_UNSPEC;
188	hints.ai_socktype = SOCK_DGRAM;
189	hints.ai_protocol = IPPROTO_UDP;
190	hints.ai_flags = AI_NUMERICHOST;
191	gai_error = getaddrinfo(addrstr, "53", &hints, &res);
192	if (gai_error != 0) {
193		fprintf(stderr, "getaddrinfo failed: %s\n",
194			gai_strerror(gai_error));
195		exit(1);
196	}
197	INSIST(res->ai_addrlen <= sizeof(sa.type));
198	memcpy(&sa.type, res->ai_addr, res->ai_addrlen);
199	freeaddrinfo(res);
200	sa.length = res->ai_addrlen;
201	ISC_LINK_INIT(&sa, link);
202	ISC_LIST_INIT(servers);
203	ISC_LIST_APPEND(servers, &sa, link);
204
205	if (namespace != NULL) {
206		namelen = strlen(namespace);
207		isc_buffer_init(&b, namespace, namelen);
208		isc_buffer_add(&b, namelen);
209		dns_fixedname_init(&fname);
210		name = dns_fixedname_name(&fname);
211		result = dns_name_fromtext(name, &b, dns_rootname, 0, NULL);
212		if (result != ISC_R_SUCCESS) {
213			fprintf(stderr, "failed to convert qname: %d\n",
214				result);
215			exit(1);
216		}
217	}
218
219	result = dns_client_setservers(client, dns_rdataclass_in, name,
220				       &servers);
221	if (result != ISC_R_SUCCESS) {
222		fprintf(stderr, "set server failed: %d\n", result);
223		exit(1);
224	}
225}
226
227int
228main(int argc, char *argv[]) {
229	int ch;
230	isc_textregion_t tr;
231	char *altserver = NULL;
232	char *altserveraddr = NULL;
233	char *altservername = NULL;
234	dns_client_t *client = NULL;
235	char *keynamestr = NULL;
236	char *keystr = NULL;
237	isc_result_t result;
238	isc_buffer_t b;
239	dns_fixedname_t qname0;
240	size_t namelen;
241	dns_name_t *qname, *name;
242	dns_rdatatype_t type = dns_rdatatype_a;
243	dns_rdataset_t *rdataset;
244	dns_namelist_t namelist;
245	isc_mem_t *keymctx = NULL;
246	unsigned int clientopt, resopt;
247	isc_boolean_t is_sep = ISC_FALSE;
248
249	while ((ch = getopt(argc, argv, "a:es:t:k:K:")) != -1) {
250		switch (ch) {
251		case 't':
252			tr.base = optarg;
253			tr.length = strlen(optarg);
254			result = dns_rdatatype_fromtext(&type, &tr);
255			if (result != ISC_R_SUCCESS) {
256				fprintf(stderr,
257					"invalid RRtype: %s\n", optarg);
258				exit(1);
259			}
260			break;
261		case 'a':
262			algname = optarg;
263			break;
264		case 'e':
265			is_sep = ISC_TRUE;
266			break;
267		case 's':
268			if (altserver != NULL) {
269				fprintf(stderr, "alternate server "
270					"already defined: %s\n",
271					altserver);
272				exit(1);
273			}
274			altserver = optarg;
275			break;
276		case 'k':
277			keynamestr = optarg;
278			break;
279		case 'K':
280			keystr = optarg;
281			break;
282		default:
283			usage();
284		}
285	}
286
287	argc -= optind;
288	argv += optind;
289	if (argc < 2)
290		usage();
291
292	if (altserver != NULL) {
293		char *cp;
294
295		cp = strchr(altserver, ':');
296		if (cp == NULL) {
297			fprintf(stderr, "invalid alternate server: %s\n",
298				altserver);
299			exit(1);
300		}
301		*cp = '\0';
302		altservername = altserver;
303		altserveraddr = cp + 1;
304	}
305
306	isc_lib_register();
307	result = dns_lib_init();
308	if (result != ISC_R_SUCCESS) {
309		fprintf(stderr, "dns_lib_init failed: %d\n", result);
310		exit(1);
311	}
312
313	clientopt = 0;
314	result = dns_client_create(&client, clientopt);
315	if (result != ISC_R_SUCCESS) {
316		fprintf(stderr, "dns_client_create failed: %d\n", result);
317		exit(1);
318	}
319
320	/* Set the nameserver */
321	addserver(client, argv[0], NULL);
322
323	/* Set the alternate nameserver (when specified) */
324	if (altserver != NULL)
325		addserver(client, altserveraddr, altservername);
326
327	/* Install DNSSEC key (if given) */
328	if (keynamestr != NULL) {
329		if (keystr == NULL) {
330			fprintf(stderr,
331				"key string is missing "
332				"while key name is provided\n");
333			exit(1);
334		}
335		set_key(client, keynamestr, keystr, is_sep, &keymctx);
336	}
337
338	/* Construct qname */
339	namelen = strlen(argv[1]);
340	isc_buffer_init(&b, argv[1], namelen);
341	isc_buffer_add(&b, namelen);
342	dns_fixedname_init(&qname0);
343	qname = dns_fixedname_name(&qname0);
344	result = dns_name_fromtext(qname, &b, dns_rootname, 0, NULL);
345	if (result != ISC_R_SUCCESS)
346		fprintf(stderr, "failed to convert qname: %d\n", result);
347
348	/* Perform resolution */
349	resopt = 0;
350	if (keynamestr == NULL)
351		resopt |= DNS_CLIENTRESOPT_NODNSSEC;
352	ISC_LIST_INIT(namelist);
353	result = dns_client_resolve(client, qname, dns_rdataclass_in, type,
354				    resopt, &namelist);
355	if (result != ISC_R_SUCCESS) {
356		fprintf(stderr,
357			"resolution failed: %s\n", dns_result_totext(result));
358	}
359	for (name = ISC_LIST_HEAD(namelist); name != NULL;
360	     name = ISC_LIST_NEXT(name, link)) {
361		for (rdataset = ISC_LIST_HEAD(name->list);
362		     rdataset != NULL;
363		     rdataset = ISC_LIST_NEXT(rdataset, link)) {
364			if (printdata(rdataset, name) != ISC_R_SUCCESS)
365				fprintf(stderr, "print data failed\n");
366		}
367	}
368
369	dns_client_freeresanswer(client, &namelist);
370
371	/* Cleanup */
372	dns_client_destroy(&client);
373	if (keynamestr != NULL)
374		isc_mem_destroy(&keymctx);
375	dns_lib_shutdown();
376
377	exit(0);
378}
379