lib/addns/dns.h

   1 /*
   2   Linux DNS client library implementation
   3
   4   Copyright (C) 2006 Krishna Ganugapati <krishnag@centeris.com>
   5   Copyright (C) 2006 Gerald Carter <jerry@samba.org>
   6
   7      ** NOTE! The following LGPL license applies to the libaddns
   8      ** library. This does NOT imply that all of Samba is released
   9      ** under the LGPL
  10
  11   This library is free software; you can redistribute it and/or
  12   modify it under the terms of the GNU Lesser General Public
  13   License as published by the Free Software Foundation; either
  14   version 2.1 of the License, or (at your option) any later version.
  15
  16   This library is distributed in the hope that it will be useful,
  17   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19   Lesser General Public License for more details.
  20
  21   You should have received a copy of the GNU Lesser General Public
  22   License along with this library; if not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #ifndef _DNS_H
  26 #define _DNS_H
  27
  28 #include "../replace/replace.h"
  29 #include "system/network.h"
  30
  31 /* make sure we have included the correct config.h */
  32 #ifndef NO_CONFIG_H /* for some tests */
  33 #ifndef CONFIG_H_IS_FROM_SAMBA
  34 #error "make sure you have removed all config.h files from standalone builds!"
  35 #error "the included config.h isn't from samba!"
  36 #endif
  37 #endif /* NO_CONFIG_H */
  38
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <fcntl.h>
  42 #include <time.h>
  43 #include <string.h>
  44 #include <errno.h>
  45 #include <netdb.h>
  46 #include <sys/types.h>
  47 #include <sys/socket.h>
  48 #include <netinet/in.h>
  49 #include <arpa/inet.h>
  50 #include <stdarg.h>
  51
  52 #ifdef HAVE_UUID_UUID_H
  53 #include <uuid/uuid.h>
  54 #endif
  55
  56 #ifdef HAVE_KRB5_H
  57 #include <krb5.h>
  58 #endif
  59
  60 #ifdef HAVE_INTTYPES_H
  61 #include <inttypes.h>
  62
  63 #ifndef int16
  64 #define int16 int16_t
  65 #endif
  66
  67 #ifndef uint16
  68 #define uint16 uint16_t
  69 #endif
  70
  71 #ifndef int32
  72 #define int32 int32_t
  73 #endif
  74
  75 #ifndef uint32
  76 #define uint32 uint32_t
  77 #endif
  78 #endif
  79
  80 #ifdef HAVE_KRB5_H
  81 #include <krb5.h>
  82 #endif
  83
  84 #if HAVE_GSSAPI_GSSAPI_H
  85 #include <gssapi/gssapi.h>
  86 #elif HAVE_GSSAPI_GSSAPI_GENERIC_H
  87 #include <gssapi/gssapi_generic.h>
  88 #elif HAVE_GSSAPI_H
  89 #include <gssapi.h>
  90 #endif
  91
  92 #if defined(HAVE_GSSAPI_H) || defined(HAVE_GSSAPI_GSSAPI_H) || defined(HAVE_GSSAPI_GSSAPI_GENERIC_H)
  93 #define HAVE_GSSAPI_SUPPORT    1
  94 #endif
  95
  96 #include <talloc.h>
  97
  98 /*******************************************************************
  99    Type definitions for int16, int32, uint16 and uint32.  Needed
 100    for Samba coding style
 101 *******************************************************************/
 102
 103 #ifndef uint8
 104 #  define uint8 unsigned char
 105 #endif
 106
 107 #if !defined(int16) && !defined(HAVE_INT16_FROM_RPC_RPC_H)
 108 #  if (SIZEOF_SHORT == 4)
 109 #    define int16 __ERROR___CANNOT_DETERMINE_TYPE_FOR_INT16;
 110 #  else /* SIZEOF_SHORT != 4 */
 111 #    define int16 short
 112 #  endif /* SIZEOF_SHORT != 4 */
 113    /* needed to work around compile issue on HP-UX 11.x */
 114 #  define _INT16        1
 115 #endif
 116
 117 /*
 118  * Note we duplicate the size tests in the unsigned
 119  * case as int16 may be a typedef from rpc/rpc.h
 120  */
 121
 122 #if !defined(uint16) && !defined(HAVE_UINT16_FROM_RPC_RPC_H)
 123 #  if (SIZEOF_SHORT == 4)
 124 #    define uint16 __ERROR___CANNOT_DETERMINE_TYPE_FOR_INT16;
 125 #  else /* SIZEOF_SHORT != 4 */
 126 #    define uint16 unsigned short
 127 #  endif /* SIZEOF_SHORT != 4 */
 128 #endif
 129
 130 #if !defined(int32) && !defined(HAVE_INT32_FROM_RPC_RPC_H)
 131 #  if (SIZEOF_INT == 4)
 132 #    define int32 int
 133 #  elif (SIZEOF_LONG == 4)
 134 #    define int32 long
 135 #  elif (SIZEOF_SHORT == 4)
 136 #    define int32 short
 137 #  else
 138      /* uggh - no 32 bit type?? probably a CRAY. just hope this works ... */
 139 #    define int32 int
 140 #  endif
 141 #  ifndef _INT32
 142      /* needed to work around compile issue on HP-UX 11.x */
 143 #    define _INT32        1
 144 #  endif
 145 #endif
 146
 147 /*
 148  * Note we duplicate the size tests in the unsigned
 149  * case as int32 may be a typedef from rpc/rpc.h
 150  */
 151
 152 #if !defined(uint32) && !defined(HAVE_UINT32_FROM_RPC_RPC_H)
 153 #  if (SIZEOF_INT == 4)
 154 #    define uint32 unsigned int
 155 #  elif (SIZEOF_LONG == 4)
 156 #    define uint32 unsigned long
 157 #  elif (SIZEOF_SHORT == 4)
 158 #    define uint32 unsigned short
 159 #  else
 160       /* uggh - no 32 bit type?? probably a CRAY. just hope this works ... */
 161 #    define uint32 unsigned
 162 #  endif
 163 #endif
 164
 165 /*
 166  * check for 8 byte long long
 167  */
 168
 169 #if !defined(uint64)
 170 #  if (SIZEOF_LONG == 8)
 171 #    define uint64 unsigned long
 172 #  elif (SIZEOF_LONG_LONG == 8)
 173 #    define uint64 unsigned long long
 174 #  endif /* don't lie.  If we don't have it, then don't use it */
 175 #endif
 176
 177 /* needed on Sun boxes */
 178 #ifndef INADDR_NONE
 179 #define INADDR_NONE          0xFFFFFFFF
 180 #endif
 181
 182 #include "dnserr.h"
 183
 184
 185 #define DNS_TCP                 1
 186 #define DNS_UDP                 2
 187
 188 #define DNS_OPCODE_UPDATE       1
 189
 190 /* DNS Class Types */
 191
 192 #define DNS_CLASS_IN            1
 193 #define DNS_CLASS_ANY           255
 194 #define DNS_CLASS_NONE          254
 195
 196 /* DNS RR Types */
 197
 198 #define DNS_RR_A                1
 199
 200 #define DNS_TCP_PORT            53
 201 #define DNS_UDP_PORT            53
 202
 203 #define QTYPE_A         1
 204 #define QTYPE_NS        2
 205 #define QTYPE_MD        3
 206 #define QTYPE_CNAME     5
 207 #define QTYPE_SOA       6
 208 #define QTYPE_ANY       255
 209 #define QTYPE_TKEY      249
 210 #define QTYPE_TSIG      250
 211
 212 /*
 213 MF              4 a mail forwarder (Obsolete - use MX)
 214 CNAME           5 the canonical name for an alias
 215 SOA             6 marks the start of a zone of authority
 216 MB              7 a mailbox domain name (EXPERIMENTAL)
 217 MG              8 a mail group member (EXPERIMENTAL)
 218 MR              9 a mail rename domain name (EXPERIMENTAL)
 219 NULL            10 a null RR (EXPERIMENTAL)
 220 WKS             11 a well known service description
 221 PTR             12 a domain name pointer
 222 HINFO           13 host information
 223 MINFO           14 mailbox or mail list information
 224 MX              15 mail exchange
 225 TXT             16 text strings
 226 */
 227
 228 #define QR_QUERY         0x0000
 229 #define QR_RESPONSE      0x0001
 230
 231 #define OPCODE_QUERY 0x00
 232 #define OPCODE_IQUERY   0x01
 233 #define OPCODE_STATUS   0x02
 234
 235 #define AA                      1
 236
 237 #define RECURSION_DESIRED       0x01
 238
 239 #define RCODE_NOERROR          0
 240 #define RCODE_FORMATERROR      1
 241 #define RCODE_SERVER_FAILURE   2
 242 #define RCODE_NAME_ERROR       3
 243 #define RCODE_NOTIMPLEMENTED   4
 244 #define RCODE_REFUSED          5
 245
 246 #define SENDBUFFER_SIZE         65536
 247 #define RECVBUFFER_SIZE         65536
 248
 249 /*
 250  * TKEY Modes from rfc2930
 251  */
 252
 253 #define DNS_TKEY_MODE_SERVER   1
 254 #define DNS_TKEY_MODE_DH       2
 255 #define DNS_TKEY_MODE_GSSAPI   3
 256 #define DNS_TKEY_MODE_RESOLVER 4
 257 #define DNS_TKEY_MODE_DELETE   5
 258
 259
 260 #define DNS_ONE_DAY_IN_SECS     86400
 261 #define DNS_TEN_HOURS_IN_SECS   36000
 262
 263 #define SOCKET_ERROR            -1
 264 #define INVALID_SOCKET          -1
 265
 266 #define  DNS_NO_ERROR           0
 267 #define  DNS_FORMAT_ERROR       1
 268 #define  DNS_SERVER_FAILURE     2
 269 #define  DNS_NAME_ERROR         3
 270 #define  DNS_NOT_IMPLEMENTED    4
 271 #define  DNS_REFUSED            5
 272
 273 typedef long HANDLE;
 274
 275 enum dns_ServerType { DNS_SRV_ANY, DNS_SRV_WIN2000, DNS_SRV_WIN2003 };
 276
 277 struct dns_domain_label {
 278         struct dns_domain_label *next;
 279         char *label;
 280         size_t len;
 281 };
 282
 283 struct dns_domain_name {
 284         struct dns_domain_label *pLabelList;
 285 };
 286
 287 struct dns_question {
 288         struct dns_domain_name *name;
 289         uint16 q_type;
 290         uint16 q_class;
 291 };
 292
 293 /*
 294  * Before changing the definition of dns_zone, look
 295  * dns_marshall_update_request(), we rely on this being the same as
 296  * dns_question right now.
 297  */
 298
 299 struct dns_zone {
 300         struct dns_domain_name *name;
 301         uint16 z_type;
 302         uint16 z_class;
 303 };
 304
 305 struct dns_rrec {
 306         struct dns_domain_name *name;
 307         uint16 type;
 308         uint16 r_class;
 309         uint32 ttl;
 310         uint16 data_length;
 311         uint8 *data;
 312 };
 313
 314 struct dns_tkey_record {
 315         struct dns_domain_name *algorithm;
 316         time_t inception;
 317         time_t expiration;
 318         uint16 mode;
 319         uint16 error;
 320         uint16 key_length;
 321         uint8 *key;
 322 };
 323
 324 struct dns_request {
 325         uint16 id;
 326         uint16 flags;
 327         uint16 num_questions;
 328         uint16 num_answers;
 329         uint16 num_auths;
 330         uint16 num_additionals;
 331         struct dns_question **questions;
 332         struct dns_rrec **answers;
 333         struct dns_rrec **auths;
 334         struct dns_rrec **additionals;
 335 };
 336
 337 /*
 338  * Before changing the definition of dns_update_request, look
 339  * dns_marshall_update_request(), we rely on this being the same as
 340  * dns_request right now.
 341  */
 342
 343 struct dns_update_request {
 344         uint16 id;
 345         uint16 flags;
 346         uint16 num_zones;
 347         uint16 num_preqs;
 348         uint16 num_updates;
 349         uint16 num_additionals;
 350         struct dns_zone **zones;
 351         struct dns_rrec **preqs;
 352         struct dns_rrec **updates;
 353         struct dns_rrec **additionals;
 354 };
 355
 356 struct dns_connection {
 357         int32 hType;
 358         int s;
 359         struct sockaddr RecvAddr;
 360 };
 361
 362 struct dns_buffer {
 363         uint8 *data;
 364         size_t size;
 365         size_t offset;
 366         DNS_ERROR error;
 367 };
 368
 369 /* from dnsutils.c */
 370
 371 DNS_ERROR dns_domain_name_from_string( TALLOC_CTX *mem_ctx,
 372                                        const char *pszDomainName,
 373                                        struct dns_domain_name **presult );
 374 char *dns_generate_keyname( TALLOC_CTX *mem_ctx );
 375
 376 /* from dnsrecord.c */
 377
 378 DNS_ERROR dns_create_query( TALLOC_CTX *mem_ctx, const char *name,
 379                             uint16 q_type, uint16 q_class,
 380                             struct dns_request **preq );
 381 DNS_ERROR dns_create_update( TALLOC_CTX *mem_ctx, const char *name,
 382                              struct dns_update_request **preq );
 383 DNS_ERROR dns_create_probe(TALLOC_CTX *mem_ctx, const char *zone,
 384                            const char *host, int num_ips,
 385                            const struct sockaddr_storage *sslist,
 386                            struct dns_update_request **preq);
 387 DNS_ERROR dns_create_rrec(TALLOC_CTX *mem_ctx, const char *name,
 388                           uint16 type, uint16 r_class, uint32 ttl,
 389                           uint16 data_length, uint8 *data,
 390                           struct dns_rrec **prec);
 391 DNS_ERROR dns_add_rrec(TALLOC_CTX *mem_ctx, struct dns_rrec *rec,
 392                        uint16 *num_records, struct dns_rrec ***records);
 393 DNS_ERROR dns_create_tkey_record(TALLOC_CTX *mem_ctx, const char *keyname,
 394                                  const char *algorithm_name, time_t inception,
 395                                  time_t expiration, uint16 mode, uint16 error,
 396                                  uint16 key_length, const uint8 *key,
 397                                  struct dns_rrec **prec);
 398 DNS_ERROR dns_create_name_in_use_record(TALLOC_CTX *mem_ctx,
 399                                         const char *name,
 400                                         const struct sockaddr_storage *ip,
 401                                         struct dns_rrec **prec);
 402 DNS_ERROR dns_create_delete_record(TALLOC_CTX *mem_ctx, const char *name,
 403                                    uint16 type, uint16 r_class,
 404                                    struct dns_rrec **prec);
 405 DNS_ERROR dns_create_name_not_in_use_record(TALLOC_CTX *mem_ctx,
 406                                             const char *name, uint32 type,
 407                                             struct dns_rrec **prec);
 408 DNS_ERROR dns_create_a_record(TALLOC_CTX *mem_ctx, const char *host,
 409                               uint32 ttl, const struct sockaddr_storage *pss,
 410                               struct dns_rrec **prec);
 411 DNS_ERROR dns_unmarshall_tkey_record(TALLOC_CTX *mem_ctx, struct dns_rrec *rec,
 412                                      struct dns_tkey_record **ptkey);
 413 DNS_ERROR dns_create_tsig_record(TALLOC_CTX *mem_ctx, const char *keyname,
 414                                  const char *algorithm_name,
 415                                  time_t time_signed, uint16 fudge,
 416                                  uint16 mac_length, const uint8 *mac,
 417                                  uint16 original_id, uint16 error,
 418                                  struct dns_rrec **prec);
 419 DNS_ERROR dns_add_rrec(TALLOC_CTX *mem_ctx, struct dns_rrec *rec,
 420                        uint16 *num_records, struct dns_rrec ***records);
 421 DNS_ERROR dns_create_update_request(TALLOC_CTX *mem_ctx,
 422                                     const char *domainname,
 423                                     const char *hostname,
 424                                     const struct sockaddr_storage *ip_addr,
 425                                     size_t num_adds,
 426                                     struct dns_update_request **preq);
 427
 428 /* from dnssock.c */
 429
 430 DNS_ERROR dns_open_connection( const char *nameserver, int32 dwType,
 431                     TALLOC_CTX *mem_ctx,
 432                     struct dns_connection **conn );
 433 DNS_ERROR dns_send(struct dns_connection *conn, const struct dns_buffer *buf);
 434 DNS_ERROR dns_receive(TALLOC_CTX *mem_ctx, struct dns_connection *conn,
 435                       struct dns_buffer **presult);
 436 DNS_ERROR dns_transaction(TALLOC_CTX *mem_ctx, struct dns_connection *conn,
 437                           const struct dns_request *req,
 438                           struct dns_request **resp);
 439 DNS_ERROR dns_update_transaction(TALLOC_CTX *mem_ctx,
 440                                  struct dns_connection *conn,
 441                                  struct dns_update_request *up_req,
 442                                  struct dns_update_request **up_resp);
 443
 444 /* from dnsmarshall.c */
 445
 446 struct dns_buffer *dns_create_buffer(TALLOC_CTX *mem_ctx);
 447 void dns_marshall_buffer(struct dns_buffer *buf, const uint8 *data,
 448                          size_t len);
 449 void dns_marshall_uint16(struct dns_buffer *buf, uint16 val);
 450 void dns_marshall_uint32(struct dns_buffer *buf, uint32 val);
 451 void dns_unmarshall_buffer(struct dns_buffer *buf, uint8 *data,
 452                            size_t len);
 453 void dns_unmarshall_uint16(struct dns_buffer *buf, uint16 *val);
 454 void dns_unmarshall_uint32(struct dns_buffer *buf, uint32 *val);
 455 void dns_unmarshall_domain_name(TALLOC_CTX *mem_ctx,
 456                                 struct dns_buffer *buf,
 457                                 struct dns_domain_name **pname);
 458 void dns_marshall_domain_name(struct dns_buffer *buf,
 459                               const struct dns_domain_name *name);
 460 void dns_unmarshall_domain_name(TALLOC_CTX *mem_ctx,
 461                                 struct dns_buffer *buf,
 462                                 struct dns_domain_name **pname);
 463 DNS_ERROR dns_marshall_request(TALLOC_CTX *mem_ctx,
 464                                const struct dns_request *req,
 465                                struct dns_buffer **pbuf);
 466 DNS_ERROR dns_unmarshall_request(TALLOC_CTX *mem_ctx,
 467                                  struct dns_buffer *buf,
 468                                  struct dns_request **preq);
 469 DNS_ERROR dns_marshall_update_request(TALLOC_CTX *mem_ctx,
 470                                       struct dns_update_request *update,
 471                                       struct dns_buffer **pbuf);
 472 DNS_ERROR dns_unmarshall_update_request(TALLOC_CTX *mem_ctx,
 473                                         struct dns_buffer *buf,
 474                                         struct dns_update_request **pupreq);
 475 struct dns_request *dns_update2request(struct dns_update_request *update);
 476 struct dns_update_request *dns_request2update(struct dns_request *request);
 477 uint16 dns_response_code(uint16 flags);
 478 const char *dns_errstr(DNS_ERROR err);
 479
 480 /* from dnsgss.c */
 481
 482 #ifdef HAVE_GSSAPI_SUPPORT
 483
 484 void display_status( const char *msg, OM_uint32 maj_stat, OM_uint32 min_stat );
 485 DNS_ERROR dns_negotiate_sec_ctx( const char *target_realm,
 486                                  const char *servername,
 487                                  const char *keyname,
 488                                  gss_ctx_id_t *gss_ctx,
 489                                  enum dns_ServerType srv_type );
 490 DNS_ERROR dns_sign_update(struct dns_update_request *req,
 491                           gss_ctx_id_t gss_ctx,
 492                           const char *keyname,
 493                           const char *algorithmname,
 494                           time_t time_signed, uint16 fudge);
 495
 496 #endif  /* HAVE_GSSAPI_SUPPORT */
 497
 498 #endif  /* _DNS_H */