contrib/bind9/lib/export/samples/sample.c

   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
  55 static char *algname;
  56
  57 static isc_result_t
  58 printdata(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
  81 ISC_PLATFORM_NORETURN_PRE static void
  82 usage(void) ISC_PLATFORM_NORETURN_POST;
  83
  84 static void
  85 usage(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
  94 static void
  95 set_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
 174 static void
 175 addserver(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
 227 int
 228 main(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 }