source/include/nameserv.h

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    NBT netbios header - version 2
   5    Copyright (C) Andrew Tridgell 1994-1997
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20
  21 */
  22
  23 #define GET_TTL(ttl) ((ttl)?MIN(ttl,lp_max_ttl()):lp_max_ttl())
  24
  25 /* NTAS uses 2, NT uses 1, WfWg uses 0 */
  26 #define MAINTAIN_LIST    2
  27 #define ELECTION_VERSION 1
  28
  29 #define MAX_DGRAM_SIZE (576) /* tcp/ip datagram limit is 576 bytes */
  30 #define MIN_DGRAM_SIZE 12
  31
  32 #define NMB_QUERY  0x20
  33 #define NMB_STATUS 0x21
  34
  35 #define NMB_REG         0x05 /* see rfc1002.txt 4.2.2,3,5,6,7,8 */
  36 #define NMB_REG_REFRESH 0x09 /* see rfc1002.txt 4.2.4 */
  37 #define NMB_REL         0x06 /* see rfc1002.txt 4.2.9,10,11 */
  38 #define NMB_WAIT_ACK    0x07 /* see rfc1002.txt 4.2.16 */
  39 /* XXXX what about all the other types?? 0x1, 0x2, 0x3, 0x4, 0x8? */
  40
  41 #define FIND_SELF  0x01
  42 #define FIND_WINS  0x02
  43 #define FIND_LOCAL 0x04
  44
  45 /* NetBIOS flags */
  46 #define NB_GROUP  0x80
  47 #define NB_PERM   0x02
  48 #define NB_ACTIVE 0x04
  49 #define NB_CONFL  0x08
  50 #define NB_DEREG  0x10
  51 #define NB_BFLAG  0x00 /* broadcast node type */
  52 #define NB_PFLAG  0x20 /* point-to-point node type */
  53 #define NB_MFLAG  0x40 /* mixed bcast & p-p node type */
  54 #define NB_HFLAG  0x60 /* microsoft 'hybrid' node type */
  55 #define NB_FLGMSK 0x60
  56
  57 #define REFRESH_TIME (15*60)
  58 #define NAME_POLL_REFRESH_TIME (5*60)
  59 #define NAME_POLL_INTERVAL 15
  60
  61 /* NetBIOS flag identifier */
  62 #define NAME_PERMANENT(p) ((p) & NB_PERM)
  63 #define NAME_ACTIVE(p)    ((p) & NB_ACTIVE)
  64 #define NAME_CONFLICT(p)  ((p) & NB_CONFL)
  65 #define NAME_DEREG(p)     ((p) & NB_DEREG)
  66 #define NAME_GROUP(p)     ((p) & NB_GROUP)
  67
  68 #define NAME_BFLAG(p)     (((p) & NB_FLGMSK) == NB_BFLAG)
  69 #define NAME_PFLAG(p)     (((p) & NB_FLGMSK) == NB_PFLAG)
  70 #define NAME_MFLAG(p)     (((p) & NB_FLGMSK) == NB_MFLAG)
  71 #define NAME_HFLAG(p)     (((p) & NB_FLGMSK) == NB_HFLAG)
  72
  73 /* server type identifiers */
  74 #define AM_MASTER(work) (work->ServerType & SV_TYPE_MASTER_BROWSER)
  75 #define AM_BACKUP(work) (work->ServerType & SV_TYPE_BACKUP_BROWSER)
  76 #define AM_DOMMST(work) (work->ServerType & SV_TYPE_DOMAIN_MASTER)
  77 #define AM_DOMMEM(work) (work->ServerType & SV_TYPE_DOMAIN_MEMBER)
  78
  79 /* microsoft browser NetBIOS name */
  80 #define MSBROWSE "\001\002__MSBROWSE__\002"
  81
  82 /* mail slots */
  83 #define BROWSE_MAILSLOT    "\\MAILSLOT\\BROWSE"
  84 #define NET_LOGON_MAILSLOT "\\MAILSLOT\\NET\\NETLOGON"
  85
  86 enum name_source {STATUS_QUERY, LMHOSTS, REGISTER, SELF, DNS, DNSFAIL};
  87 enum node_type {B_NODE=0, P_NODE=1, M_NODE=2, NBDD_NODE=3};
  88 enum packet_type {NMB_PACKET, DGRAM_PACKET};
  89
  90 enum master_state
  91 {
  92    MST_POTENTIAL,
  93    MST_BACK,
  94    MST_MSB,
  95    MST_BROWSER
  96 };
  97
  98 enum domain_state
  99 {
 100    DOMAIN_NONE,
 101    DOMAIN_WAIT,
 102    DOMAIN_MST
 103 };
 104
 105 enum logon_state
 106 {
 107    LOGON_NONE,
 108    LOGON_WAIT,
 109    LOGON_SRV
 110 };
 111
 112 enum state_type
 113 {
 114         NAME_STATUS_DOM_SRV_CHK,
 115         NAME_STATUS_SRV_CHK,
 116         NAME_REGISTER_CHALLENGE,
 117         NAME_REGISTER,
 118         NAME_RELEASE,
 119         NAME_QUERY_CONFIRM,
 120         NAME_QUERY_ANNOUNCE_HOST,
 121         NAME_QUERY_SYNC_LOCAL,
 122         NAME_QUERY_SYNC_REMOTE,
 123         NAME_QUERY_DOM_SRV_CHK,
 124         NAME_QUERY_SRV_CHK,
 125         NAME_QUERY_FIND_MST,
 126         NAME_QUERY_MST_CHK,
 127         NAME_QUERY_DOMAIN
 128 };
 129
 130 /* a netbios name structure */
 131 struct nmb_name {
 132   char name[17];
 133   char scope[64];
 134   int name_type;
 135 };
 136
 137 /* a netbios flags + ip address structure */
 138 /* this is used for multi-homed systems and for internet group names */
 139 struct nmb_ip
 140 {
 141   struct in_addr ip; /* ip address of host that owns this name */
 142   uint16 nb_flags;      /* netbios flags */
 143 };
 144
 145 /* this is the structure used for the local netbios name list */
 146 struct name_record
 147 {
 148   struct name_record *next;
 149   struct name_record *prev;
 150
 151   struct nmb_name name;    /* the netbios name */
 152   struct nmb_ip *ip_flgs;  /* the ip + flags */
 153   int num_ips;             /* number of ip+flags entries */
 154
 155   enum name_source source; /* where the name came from */
 156
 157   time_t death_time; /* time record must be removed (do not remove if 0) */
 158   time_t refresh_time; /* time record should be refreshed */
 159 };
 160
 161 struct subnet_record;
 162
 163 /* browse and backup server cache for synchronising browse list */
 164 struct browse_cache_record
 165 {
 166         struct browse_cache_record *next;
 167         struct browse_cache_record *prev;
 168
 169         pstring name;
 170         int type;
 171         pstring group;
 172         struct in_addr ip;
 173         time_t sync_time;
 174         BOOL synced;
 175         BOOL local;
 176         struct subnet_record *subnet;
 177 };
 178
 179 /* this is used to hold the list of servers in my domain, and is */
 180 /* contained within lists of domains */
 181 struct server_record
 182 {
 183   struct server_record *next;
 184   struct server_record *prev;
 185
 186   struct server_info_struct serv;
 187   time_t death_time;
 188 };
 189
 190 /* a workgroup structure. it contains a list of servers */
 191 struct work_record
 192 {
 193   struct work_record *next;
 194   struct work_record *prev;
 195
 196   struct server_record *serverlist;
 197
 198   /* stage of development from non-local-master up to local-master browser */
 199   enum master_state mst_state;
 200
 201   /* stage of development from non-domain-master to domain master browser */
 202   enum domain_state dom_state;
 203
 204   /* stage of development from non-logon-server to logon server */
 205   enum logon_state log_state;
 206
 207   /* work group info */
 208   fstring work_group;
 209   int     token;        /* used when communicating with backup browsers */
 210   int     ServerType;
 211
 212   /* announce info */
 213   time_t lastannounce_time;
 214   int announce_interval;
 215   BOOL    needannounce;
 216
 217
 218   /* election info */
 219   BOOL    RunningElection;
 220   BOOL    needelection;
 221   int     ElectionCount;
 222   uint32  ElectionCriterion;
 223 };
 224
 225 /* initiated name queries recorded in this list to track any responses... */
 226 /* sadly, we need to group everything together. i suppose that if this
 227    gets unwieldy, then a union ought to be considered. oh for c++... */
 228 struct response_record
 229 {
 230   struct response_record *next;
 231   struct response_record *prev;
 232
 233   uint16 response_id;
 234   enum state_type state;
 235
 236   int fd;
 237   int quest_type;
 238   struct nmb_name name;
 239   int nb_flags;
 240   time_t ttl;
 241
 242   int server_type;
 243   fstring my_name;
 244   fstring my_comment;
 245
 246   BOOL bcast;
 247   BOOL recurse;
 248   struct in_addr send_ip;
 249   struct in_addr reply_to_ip;
 250
 251   int num_msgs;
 252
 253   time_t repeat_time;
 254   time_t repeat_interval;
 255   int    repeat_count;
 256 };
 257
 258 /* a subnet structure. it contains a list of workgroups and netbios names*/
 259
 260 /* note that a subnet of 255.255.255.255 contains all the WINS netbios names.
 261    all communication from such nodes are on a non-broadcast basis: they
 262    are point-to-point (P nodes) or mixed point-to-point and broadcast
 263    (M nodes). M nodes use point-to-point as a preference, and will use
 264    broadcasting for certain activities, or will resort to broadcasting as a
 265    last resort, if the WINS server fails (users of wfwg will notice that their
 266    machine often freezes for 30 seconds at a time intermittently, if the WINS
 267    server is down).
 268
 269    B nodes will have their own, totally separate subnet record, with their
 270    own netbios name set. these do NOT interact with other subnet records'
 271    netbios names, INCLUDING the WINS one (with an ip "address", so called,
 272    of 255.255.255.255)
 273
 274    there is a separate response list for each subnet record. in the case of
 275    the 255.255.255.255 subnet record (WINS), the WINS server will be able to
 276    use this to poll (infrequently!) each of its entries, to ensure that the
 277    names are still in use.
 278    XXXX this polling is a planned feature for a really over-cautious WINS server
 279 */
 280
 281 struct subnet_record
 282 {
 283   struct subnet_record *next;
 284   struct subnet_record *prev;
 285
 286   struct work_record *workgrouplist; /* list of workgroups */
 287   struct name_record *namelist;      /* list of netbios names */
 288   struct response_record *responselist; /* list of responses expected */
 289
 290   struct in_addr bcast_ip;
 291   struct in_addr mask_ip;
 292   struct in_addr myip;
 293 };
 294
 295 /* a resource record */
 296 struct res_rec {
 297   struct nmb_name rr_name;
 298   int rr_type;
 299   int rr_class;
 300   int ttl;
 301   int rdlength;
 302   char rdata[MAX_DGRAM_SIZE];
 303 };
 304
 305 /* define a nmb packet. */
 306 struct nmb_packet
 307 {
 308   struct {
 309     int name_trn_id;
 310     int opcode;
 311     BOOL response;
 312     struct {
 313       BOOL bcast;
 314       BOOL recursion_available;
 315       BOOL recursion_desired;
 316       BOOL trunc;
 317       BOOL authoritative;
 318     } nm_flags;
 319     int rcode;
 320     int qdcount;
 321     int ancount;
 322     int nscount;
 323     int arcount;
 324   } header;
 325
 326   struct {
 327     struct nmb_name question_name;
 328     int question_type;
 329     int question_class;
 330   } question;
 331
 332   struct res_rec *answers;
 333   struct res_rec *nsrecs;
 334   struct res_rec *additional;
 335 };
 336
 337
 338 /* a datagram - this normally contains SMB data in the data[] array */
 339 struct dgram_packet {
 340   struct {
 341     int msg_type;
 342     struct {
 343       enum node_type node_type;
 344       BOOL first;
 345       BOOL more;
 346     } flags;
 347     int dgm_id;
 348     struct in_addr source_ip;
 349     int source_port;
 350     int dgm_length;
 351     int packet_offset;
 352   } header;
 353   struct nmb_name source_name;
 354   struct nmb_name dest_name;
 355   int datasize;
 356   char data[MAX_DGRAM_SIZE];
 357 };
 358
 359 /* define a structure used to queue packets. this will be a linked
 360  list of nmb packets */
 361 struct packet_struct
 362 {
 363   struct packet_struct *next;
 364   struct packet_struct *prev;
 365   struct in_addr ip;
 366   int port;
 367   int fd;
 368   time_t timestamp;
 369   enum packet_type packet_type;
 370   union {
 371     struct nmb_packet nmb;
 372     struct dgram_packet dgram;
 373   } packet;
 374 };
 375
 376
 377 /* ids for netbios packet types */
 378 #define ANN_HostAnnouncement         1
 379 #define ANN_AnnouncementRequest      2
 380 #define ANN_Election                 8
 381 #define ANN_GetBackupListReq         9
 382 #define ANN_GetBackupListResp       10
 383 #define ANN_BecomeBackup            11
 384 #define ANN_DomainAnnouncement      12
 385 #define ANN_MasterAnnouncement      13
 386 #define ANN_ResetBrowserState       14
 387 #define ANN_LocalMasterAnnouncement 15
 388
 389
 390 /* broadcast packet announcement intervals, in minutes */
 391
 392 /* attempt to add domain logon and domain master names */
 393 #define CHECK_TIME_ADD_DOM_NAMES 5
 394
 395 /* search for master browsers of workgroups samba knows about,
 396    except default */
 397 #define CHECK_TIME_MST_BROWSE       5
 398
 399 /* request backup browser announcements from other servers */
 400 #define CHECK_TIME_ANNOUNCE_BACKUP 15
 401
 402 /* request host announcements from other servers: min and max of interval */
 403 #define CHECK_TIME_MIN_HOST_ANNCE   3
 404 #define CHECK_TIME_MAX_HOST_ANNCE  12
 405
 406 /* announce as master to WINS server and any Primary Domain Controllers */
 407 #define CHECK_TIME_MST_ANNOUNCE    15
 408
 409 /* do all remote announcements this often */
 410 #define REMOTE_ANNOUNCE_INTERVAL 180
 411
 412 #define DFLT_SERVER_TYPE (SV_TYPE_WORKSTATION | SV_TYPE_SERVER | \
 413                           (lp_time_server() ? SV_TYPE_TIME_SOURCE : 0) | \
 414                           SV_TYPE_SERVER_UNIX | \
 415                           SV_TYPE_PRINTQ_SERVER | SV_TYPE_SERVER_NT | \
 416                           SV_TYPE_NT )
 417
 418 /* Macro's to enumerate subnets either with or without
 419    the WINS subnet. */
 420
 421 extern struct subnet_record *subnetlist;
 422 extern struct subnet_record *wins_subnet;
 423
 424 #define FIRST_SUBNET subnetlist
 425 #define NEXT_SUBNET_EXCLUDING_WINS(x) ((x)->next)
 426 #define NEXT_SUBNET_INCLUDING_WINS(x) ( ((x) == wins_subnet) ? NULL : \
 427                                         (((x)->next == NULL) ? wins_subnet : \
 428                                          (x)->next))
 429