2 Unix SMB/Netbios implementation.
4 NBT netbios header - version 2
5 Copyright (C) Andrew Tridgell 1994-1995
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.
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.
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.
23 #define GET_TTL(ttl) ((ttl)?MIN(ttl,lp_max_ttl()):lp_max_ttl())
25 /* NTAS uses 2, NT uses 1, WfWg uses 0 */
26 #define MAINTAIN_LIST 2
27 #define ELECTION_VERSION 1
29 #define MAX_DGRAM_SIZE (576) /* tcp/ip datagram limit is 576 bytes */
30 #define MIN_DGRAM_SIZE 12
32 #define NMB_QUERY 0x20
33 #define NMB_STATUS 0x21
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? */
41 #define FIND_SELF 0x01
42 #define FIND_WINS 0x02
43 #define FIND_LOCAL 0x04
48 #define NB_ACTIVE 0x04
55 #define NB_FLGMSK 0x60
57 #define REFRESH_TIME (15*60)
58 #define NAME_POLL_REFRESH_TIME (5*60)
59 #define NAME_POLL_INTERVAL 15
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)
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__FLAG(p) (((p) & NB_FLGMSK) == NB__FLAG)
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_DOMCTL(work) (work->ServerType & SV_TYPE_DOMAIN_CTRL)
78 /* microsoft browser NetBIOS name */
79 #define MSBROWSE "\001\002__MSBROWSE__\002"
82 #define BROWSE_MAILSLOT "\\MAILSLOT\\BROWSE"
83 #define NET_LOGON_MAILSLOT "\\MAILSLOT\\NET\\NETLOGON"
85 enum name_source {STATUS_QUERY, LMHOSTS, REGISTER, SELF, DNS, DNSFAIL};
86 enum node_type {B_NODE=0, P_NODE=1, M_NODE=2, NBDD_NODE=3};
87 enum packet_type {NMB_PACKET, DGRAM_PACKET};
88 enum master_state { MST_NONE, MST_WON, MST_MSB, MST_BROWSER, MST_DOMAIN };
92 NAME_STATUS_PDC_SRV_CHK,
94 NAME_REGISTER_CHALLENGE,
99 NAME_QUERY_PDC_SRV_CHK,
105 /* a netbios name structure */
112 /* this is the structure used for the local netbios name list */
115 struct name_record *next;
116 struct name_record *prev;
118 struct nmb_name name; /* the netbios name */
119 struct in_addr ip; /* ip address of host that owns this name */
120 int nb_flags; /* netbios flags */
122 enum name_source source; /* where the name came from */
124 time_t death_time; /* time record must be removed (do not remove if 0) */
125 time_t refresh_time; /* time record should be refreshed */
128 /* browse and backup server cache for synchronising browse list */
129 struct browse_cache_record
131 struct browse_cache_record *next;
132 struct browse_cache_record *prev;
142 /* this is used to hold the list of servers in my domain, and is */
143 /* contained within lists of domains */
146 struct server_record *next;
147 struct server_record *prev;
149 struct server_info_struct serv;
153 /* a workgroup structure. it contains a list of servers */
156 struct work_record *next;
157 struct work_record *prev;
159 struct server_record *serverlist;
161 /* stage of development from non-master to master browser / domain master */
162 enum master_state state;
164 /* work group info */
166 int token; /* used when communicating with backup browsers */
170 time_t lastannounce_time;
171 int announce_interval;
176 BOOL RunningElection;
179 uint32 ElectionCriterion;
182 /* initiated name queries recorded in this list to track any responses... */
183 struct response_record
185 struct response_record *next;
186 struct response_record *prev;
189 enum state_type state;
193 struct nmb_name name;
199 struct in_addr send_ip;
200 struct in_addr reply_to_ip;
205 time_t repeat_interval;
209 /* a subnet structure. it contains a list of workgroups and netbios names*/
211 /* note that a subnet of 255.255.255.255 contains all the WINS netbios names.
212 all communication from such nodes are on a non-broadcast basis: they
213 are point-to-point (P nodes) or mixed point-to-point and broadcast
214 (M nodes). M nodes use point-to-point as a preference, and will use
215 broadcasting for certain activities, or will resort to broadcasting as a
216 last resort, if the WINS server fails (users of wfwg will notice that their
217 machine often freezes for 30 seconds at a time intermittently, if the WINS
220 B nodes will have their own, totally separate subnet record, with their
221 own netbios name set. these do NOT interact with other subnet records'
222 netbios names, INCLUDING the WINS one (with an ip "address", so called,
225 there is a separate response list for each subnet record. in the case of
226 the 255.255.255.255 subnet record (WINS), the WINS server will be able to
227 use this to poll (infrequently!) each of its entries, to ensure that the
228 names are still in use.
229 XXXX this polling is a planned feature for a really over-cautious WINS server
234 struct subnet_record *next;
235 struct subnet_record *prev;
237 struct work_record *workgrouplist; /* list of workgroups */
238 struct name_record *namelist; /* list of netbios names */
239 struct response_record *responselist; /* list of responses expected */
241 struct in_addr bcast_ip;
242 struct in_addr mask_ip;
248 /* a resource record */
250 struct nmb_name rr_name;
255 char rdata[MAX_DGRAM_SIZE];
258 /* define a nmb packet. */
267 BOOL recursion_available;
268 BOOL recursion_desired;
280 struct nmb_name question_name;
285 struct res_rec *answers;
286 struct res_rec *nsrecs;
287 struct res_rec *additional;
291 /* a datagram - this normally contains SMB data in the data[] array */
292 struct dgram_packet {
296 enum node_type node_type;
301 struct in_addr source_ip;
306 struct nmb_name source_name;
307 struct nmb_name dest_name;
309 char data[MAX_DGRAM_SIZE];
312 /* define a structure used to queue packets. this will be a linked
313 list of nmb packets */
316 struct packet_struct *next;
317 struct packet_struct *prev;
322 enum packet_type packet_type;
324 struct nmb_packet nmb;
325 struct dgram_packet dgram;
330 /* ids for netbios packet types */
331 #define ANN_HostAnnouncement 1
332 #define ANN_AnnouncementRequest 2
333 #define ANN_Election 8
334 #define ANN_GetBackupListReq 9
335 #define ANN_GetBackupListResp 10
336 #define ANN_BecomeBackup 11
337 #define ANN_DomainAnnouncement 12
338 #define ANN_MasterAnnouncement 13
339 #define ANN_ResetBrowserState 14
340 #define ANN_LocalMasterAnnouncement 15
343 /* broadcast packet announcement intervals, in minutes */
345 /* search for master browsers of workgroups samba knows about,
347 #define CHECK_TIME_MST_BROWSE 5
349 /* request backup browser announcements from other servers */
350 #define CHECK_TIME_ANNOUNCE_BACKUP 15
352 /* request host announcements from other servers: min and max of interval */
353 #define CHECK_TIME_MIN_HOST_ANNCE 3
354 #define CHECK_TIME_MAX_HOST_ANNCE 12
356 /* announce as master to WINS server and any Primary Domain Controllers */
357 #define CHECK_TIME_MST_ANNOUNCE 15