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_SYNC_LOCAL,
 121         NAME_QUERY_SYNC_REMOTE,
 122         NAME_QUERY_DOM_SRV_CHK,
 123         NAME_QUERY_SRV_CHK,
 124         NAME_QUERY_FIND_MST,
 125         NAME_QUERY_MST_CHK,
 126         NAME_QUERY_DOMAIN
 127 };
 128
 129 /* a netbios name structure */
 130 struct nmb_name {
 131   char name[17];
 132   char scope[64];
 133   int name_type;
 134 };
 135
 136 /* a netbios flags + ip address structure */
 137 /* this is used for multi-homed systems and for internet group names */
 138 struct nmb_ip
 139 {
 140   struct in_addr ip; /* ip address of host that owns this name */
 141   uint16 nb_flags;      /* netbios flags */
 142 };
 143
 144 /* this is the structure used for the local netbios name list */
 145 struct name_record
 146 {
 147   struct name_record *next;
 148   struct name_record *prev;
 149
 150   struct nmb_name name;    /* the netbios name */
 151   struct nmb_ip *ip_flgs;  /* the ip + flags */
 152   int num_ips;             /* number of ip+flags entries */
 153
 154   enum name_source source; /* where the name came from */
 155
 156   time_t death_time; /* time record must be removed (do not remove if 0) */
 157   time_t refresh_time; /* time record should be refreshed */
 158 };
 159
 160 struct subnet_record;
 161
 162 /* browse and backup server cache for synchronising browse list */
 163 struct browse_cache_record
 164 {
 165         struct browse_cache_record *next;
 166         struct browse_cache_record *prev;
 167
 168         pstring name;
 169         int type;
 170         pstring group;
 171         struct in_addr ip;
 172         time_t sync_time;
 173         BOOL synced;
 174         BOOL local;
 175         struct subnet_record *subnet;
 176 };
 177
 178 /* this is used to hold the list of servers in my domain, and is */
 179 /* contained within lists of domains */
 180 struct server_record
 181 {
 182   struct server_record *next;
 183   struct server_record *prev;
 184
 185   struct server_info_struct serv;
 186   time_t death_time;
 187 };
 188
 189 /* a workgroup structure. it contains a list of servers */
 190 struct work_record
 191 {
 192   struct work_record *next;
 193   struct work_record *prev;
 194
 195   struct server_record *serverlist;
 196
 197   /* stage of development from non-local-master up to local-master browser */
 198   enum master_state mst_state;
 199
 200   /* stage of development from non-domain-master to domain master browser */
 201   enum domain_state dom_state;
 202
 203   /* stage of development from non-logon-server to logon server */
 204   enum logon_state log_state;
 205
 206   /* work group info */
 207   fstring work_group;
 208   int     token;        /* used when communicating with backup browsers */
 209   int     ServerType;
 210
 211   /* announce info */
 212   time_t lastannounce_time;
 213   int announce_interval;
 214   BOOL    needannounce;
 215
 216
 217   /* election info */
 218   BOOL    RunningElection;
 219   BOOL    needelection;
 220   int     ElectionCount;
 221   uint32  ElectionCriterion;
 222 };
 223
 224 /* initiated name queries recorded in this list to track any responses... */
 225 /* sadly, we need to group everything together. i suppose that if this
 226    gets unwieldy, then a union ought to be considered. oh for c++... */
 227 struct response_record
 228 {
 229   struct response_record *next;
 230   struct response_record *prev;
 231
 232   uint16 response_id;
 233   enum state_type state;
 234
 235   int fd;
 236   int quest_type;
 237   struct nmb_name name;
 238   int nb_flags;
 239   time_t ttl;
 240
 241   int server_type;
 242   fstring my_name;
 243   fstring my_comment;
 244
 245   BOOL bcast;
 246   BOOL recurse;
 247   struct in_addr send_ip;
 248   struct in_addr reply_to_ip;
 249
 250   int num_msgs;
 251
 252   time_t repeat_time;
 253   time_t repeat_interval;
 254   int    repeat_count;
 255 };
 256
 257 /* a subnet structure. it contains a list of workgroups and netbios names*/
 258
 259 /* note that a subnet of 255.255.255.255 contains all the WINS netbios names.
 260    all communication from such nodes are on a non-broadcast basis: they
 261    are point-to-point (P nodes) or mixed point-to-point and broadcast
 262    (M nodes). M nodes use point-to-point as a preference, and will use
 263    broadcasting for certain activities, or will resort to broadcasting as a
 264    last resort, if the WINS server fails (users of wfwg will notice that their
 265    machine often freezes for 30 seconds at a time intermittently, if the WINS
 266    server is down).
 267
 268    B nodes will have their own, totally separate subnet record, with their
 269    own netbios name set. these do NOT interact with other subnet records'
 270    netbios names, INCLUDING the WINS one (with an ip "address", so called,
 271    of 255.255.255.255)
 272
 273    there is a separate response list for each subnet record. in the case of
 274    the 255.255.255.255 subnet record (WINS), the WINS server will be able to
 275    use this to poll (infrequently!) each of its entries, to ensure that the
 276    names are still in use.
 277    XXXX this polling is a planned feature for a really over-cautious WINS server
 278 */
 279
 280 struct subnet_record
 281 {
 282   struct subnet_record *next;
 283   struct subnet_record *prev;
 284
 285   struct work_record *workgrouplist; /* list of workgroups */
 286   struct name_record *namelist;      /* list of netbios names */
 287   struct response_record *responselist; /* list of responses expected */
 288
 289   struct in_addr bcast_ip;
 290   struct in_addr mask_ip;
 291   struct in_addr myip;
 292 };
 293
 294 /* a resource record */
 295 struct res_rec {
 296   struct nmb_name rr_name;
 297   int rr_type;
 298   int rr_class;
 299   int ttl;
 300   int rdlength;
 301   char rdata[MAX_DGRAM_SIZE];
 302 };
 303
 304 /* define a nmb packet. */
 305 struct nmb_packet
 306 {
 307   struct {
 308     int name_trn_id;
 309     int opcode;
 310     BOOL response;
 311     struct {
 312       BOOL bcast;
 313       BOOL recursion_available;
 314       BOOL recursion_desired;
 315       BOOL trunc;
 316       BOOL authoritative;
 317     } nm_flags;
 318     int rcode;
 319     int qdcount;
 320     int ancount;
 321     int nscount;
 322     int arcount;
 323   } header;
 324
 325   struct {
 326     struct nmb_name question_name;
 327     int question_type;
 328     int question_class;
 329   } question;
 330
 331   struct res_rec *answers;
 332   struct res_rec *nsrecs;
 333   struct res_rec *additional;
 334 };
 335
 336
 337 /* a datagram - this normally contains SMB data in the data[] array */
 338 struct dgram_packet {
 339   struct {
 340     int msg_type;
 341     struct {
 342       enum node_type node_type;
 343       BOOL first;
 344       BOOL more;
 345     } flags;
 346     int dgm_id;
 347     struct in_addr source_ip;
 348     int source_port;
 349     int dgm_length;
 350     int packet_offset;
 351   } header;
 352   struct nmb_name source_name;
 353   struct nmb_name dest_name;
 354   int datasize;
 355   char data[MAX_DGRAM_SIZE];
 356 };
 357
 358 /* define a structure used to queue packets. this will be a linked
 359  list of nmb packets */
 360 struct packet_struct
 361 {
 362   struct packet_struct *next;
 363   struct packet_struct *prev;
 364   struct in_addr ip;
 365   int port;
 366   int fd;
 367   time_t timestamp;
 368   enum packet_type packet_type;
 369   union {
 370     struct nmb_packet nmb;
 371     struct dgram_packet dgram;
 372   } packet;
 373 };
 374
 375
 376 /* ids for netbios packet types */
 377 #define ANN_HostAnnouncement         1
 378 #define ANN_AnnouncementRequest      2
 379 #define ANN_Election                 8
 380 #define ANN_GetBackupListReq         9
 381 #define ANN_GetBackupListResp       10
 382 #define ANN_BecomeBackup            11
 383 #define ANN_DomainAnnouncement      12
 384 #define ANN_MasterAnnouncement      13
 385 #define ANN_ResetBrowserState       14
 386 #define ANN_LocalMasterAnnouncement 15
 387
 388
 389 /* broadcast packet announcement intervals, in minutes */
 390
 391 /* attempt to add domain logon and domain master names */
 392 #define CHECK_TIME_ADD_DOM_NAMES 5
 393
 394 /* search for master browsers of workgroups samba knows about,
 395    except default */
 396 #define CHECK_TIME_MST_BROWSE       5
 397
 398 /* request backup browser announcements from other servers */
 399 #define CHECK_TIME_ANNOUNCE_BACKUP 15
 400
 401 /* request host announcements from other servers: min and max of interval */
 402 #define CHECK_TIME_MIN_HOST_ANNCE   3
 403 #define CHECK_TIME_MAX_HOST_ANNCE  12
 404
 405 /* announce as master to WINS server and any Primary Domain Controllers */
 406 #define CHECK_TIME_MST_ANNOUNCE    15
 407
 408 /* do all remote announcements this often */
 409 #define REMOTE_ANNOUNCE_INTERVAL 180
 410
 411 /* Types of machine we can announce as */
 412 #define ANNOUNCE_AS_NT 1
 413 #define ANNOUNCE_AS_WIN95 2
 414 #define ANNOUNCE_AS_WFW 3
 415
 416 /* Macro's to enumerate subnets either with or without
 417    the WINS subnet. */
 418
 419 extern struct subnet_record *subnetlist;
 420 extern struct subnet_record *wins_subnet;
 421
 422 #define FIRST_SUBNET subnetlist
 423 #define NEXT_SUBNET_EXCLUDING_WINS(x) ((x)->next)
 424 #define NEXT_SUBNET_INCLUDING_WINS(x) ( ((x) == wins_subnet) ? NULL : \
 425                                         (((x)->next == NULL) ? wins_subnet : \
 426                                          (x)->next))
 427