Mercurial > illumos > illumos-gate
annotate usr/src/lib/smbsrv/libsmbns/common/smbns_browser.c @ 10717:fe0545fc3cdd
6612607 CIFS ADS client should use ldap_sasl_interactive_bind_s API
6877755 smbd should not route stderr, stdout to /dev/null
6882701 Wrong error message for attempt to map local user to Windows group, or vice versa
6885105 Potential for deadlock in smb_node_set_delete_on_close()
6881928 smbd core generated when running a script to join domain, set abe properties
6885538 Reduce dependencies on libsmbrdr
6820325 cifs service can't start on multi vlan+ipmp configuration
| author | Alan Wright <amw@Sun.COM> |
|---|---|
| date | Mon, 05 Oct 2009 11:03:34 -0700 |
| parents | 3569b6c7f56c |
| children | 37e5dcdf36d3 |
| rev | line source |
|---|---|
| 5331 | 1 /* |
| 2 * CDDL HEADER START | |
| 3 * | |
| 4 * The contents of this file are subject to the terms of the | |
| 5 * Common Development and Distribution License (the "License"). | |
| 6 * You may not use this file except in compliance with the License. | |
| 7 * | |
| 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE | |
| 9 * or http://www.opensolaris.org/os/licensing. | |
| 10 * See the License for the specific language governing permissions | |
| 11 * and limitations under the License. | |
| 12 * | |
| 13 * When distributing Covered Code, include this CDDL HEADER in each | |
| 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. | |
| 15 * If applicable, add the following below this CDDL HEADER, with the | |
| 16 * fields enclosed by brackets "[]" replaced with your own identifying | |
| 17 * information: Portions Copyright [yyyy] [name of copyright owner] | |
| 18 * | |
| 19 * CDDL HEADER END | |
| 20 */ | |
| 21 /* | |
|
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22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. |
| 5331 | 23 * Use is subject to license terms. |
| 24 */ | |
| 25 | |
|
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26 #include <sys/tzfile.h> |
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27 #include <errno.h> |
| 5331 | 28 #include <stdlib.h> |
| 29 #include <stdio.h> | |
| 30 #include <unistd.h> | |
| 31 #include <syslog.h> | |
| 32 #include <string.h> | |
| 33 #include <strings.h> | |
| 34 #include <time.h> | |
| 35 #include <synch.h> | |
| 36 #include <netdb.h> | |
| 37 #include <sys/socket.h> | |
| 38 #include <arpa/inet.h> | |
| 39 | |
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40 #include <smbsrv/libsmb.h> |
| 5331 | 41 #include <smbsrv/libsmbns.h> |
| 42 #include <smbsrv/cifs.h> | |
| 43 #include <smbsrv/mailslot.h> | |
| 44 #include <smbns_browser.h> | |
| 45 #include <smbns_netbios.h> | |
| 46 | |
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47 /* |
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48 * ntdomain_info |
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49 * Temporary. It should be removed once NBTD is integrated. |
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50 */ |
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51 smb_ntdomain_t ntdomain_info; |
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52 mutex_t ntdomain_mtx; |
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53 cond_t ntdomain_cv; |
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54 |
| 5331 | 55 #define SMB_SERVER_SIGNATURE 0xaa550415 |
| 56 | |
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57 typedef struct smb_hostinfo { |
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58 list_node_t hi_lnd; |
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59 smb_nic_t hi_nic; |
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60 char hi_nbname[NETBIOS_NAME_SZ]; |
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61 name_entry_t hi_netname; |
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62 uint32_t hi_nextannouce; |
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63 int hi_reps; |
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64 int hi_interval; |
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65 uint8_t hi_updatecnt; |
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66 uint32_t hi_type; |
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67 } smb_hostinfo_t; |
| 5331 | 68 |
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69 typedef struct smb_browserinfo { |
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70 list_t bi_hlist; |
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71 int bi_hcnt; |
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72 rwlock_t bi_hlist_rwl; |
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73 boolean_t bi_changed; |
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74 mutex_t bi_mtx; |
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75 } smb_browserinfo_t; |
| 5331 | 76 |
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77 static smb_browserinfo_t smb_binfo; |
| 5331 | 78 |
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79 static int smb_browser_init(void); |
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80 static void smb_browser_infoinit(void); |
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81 static void smb_browser_infoterm(void); |
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82 static void smb_browser_infofree(void); |
| 5331 | 83 |
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84 |
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85 void |
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86 smb_browser_reconfig(void) |
| 5331 | 87 { |
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88 (void) mutex_lock(&smb_binfo.bi_mtx); |
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89 smb_binfo.bi_changed = B_TRUE; |
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90 (void) mutex_unlock(&smb_binfo.bi_mtx); |
| 5331 | 91 } |
| 92 | |
| 93 /* | |
| 94 * 3. Browser Overview | |
| 95 * | |
| 96 * Hosts involved in the browsing process can be separated into two | |
| 97 * distinct groups, browser clients and browser servers (often referred to | |
| 98 * simply as "browsers"). | |
| 99 * | |
| 100 * A browser is a server which maintains information about servers - | |
| 101 * primarily the domain they are in and the services that they are running | |
| 102 * -- and about domains. Browsers may assume several different roles in | |
| 103 * their lifetimes, and dynamically switch between them. | |
| 104 * | |
| 105 * Browser clients are of two types: workstations and (non-browser) | |
| 106 * servers. In the context of browsing, workstations query browsers for the | |
| 107 * information they contain; servers supply browsers the information by | |
| 108 * registering with them. Note that, at times, browsers may themselves | |
| 109 * behave as browser clients and query other browsers. | |
| 110 * | |
| 111 * For the purposes of this specification, a domain is simply a name with | |
| 112 * which to associate a group of resources such as computers, servers and | |
| 113 * users. Domains allow a convenient means for browser clients to restrict | |
| 114 * the scope of a search when they query browser servers. Every domain has | |
| 115 * a "master" server called the Primary Domain Controller (PDC) that | |
| 116 * manages various activities within the domain. | |
| 117 * | |
| 118 * One browser for each domain on a subnet is designated the Local Master | |
| 119 * Browser for that domain. Servers in its domain on the subnet register | |
| 120 * with it, as do the Local Master Browsers for other domains on the | |
| 121 * subnet. It uses these registrations to maintain authoritative | |
| 122 * information about its domain on its subnet. If there are other subnets | |
| 123 * in the network, it also knows the name of the server running the | |
| 124 * domain's Domain Master Browser; it registers with it, and uses it to | |
| 125 * obtain information about the rest of the network (see below). | |
| 126 * | |
| 127 * Clients on a subnet query browsers designated as the Backup Browsers for | |
| 128 * the subnet (not the Master Browser). Backup Browsers maintain a copy of | |
| 129 * the information on the Local Master Browser; they get it by periodically | |
| 130 * querying the Local Master Browser for all of its information. Clients | |
| 131 * find the Backup Browsers by asking the Local Master Browser. Clients are | |
| 132 * expected to spread their queries evenly across Backup Browsers to | |
| 133 * balance the load. | |
| 134 * | |
| 135 * The Local Master Browser is dynamically elected automatically. Multiple | |
| 136 * Backup Browser Servers may exist per subnet; they are selected from | |
| 137 * among the potential browser servers by the Local Master Browser, which | |
| 138 * is configured to select enough to handle the expected query load. | |
| 139 * | |
| 140 * When there are multiple subnets, a Domain Master Browser is assigned | |
| 141 * the task of keeping the multiple subnets in synchronization. The Primary | |
| 142 * Domain Controller (PDC) always acts as the Domain Master Browser. The | |
| 143 * Domain Master Browser periodically acts as a client and queries all the | |
| 144 * Local Master Browsers for its domain, asking them for a list containing | |
| 145 * all the domains and all the servers in their domain known within their | |
| 146 * subnets; it merges all the replies into a single master list. This | |
| 147 * allows a Domain Master Browser server to act as a collection point for | |
| 148 * inter-subnet browsing information. Local Master Browsers periodically | |
| 149 * query the Domain Master Browser to retrieve the network-wide information | |
| 150 * it maintains. | |
| 151 * | |
| 152 * When a domain spans only a single subnet, there will not be any distinct | |
| 153 * Local Master Browser; this role will be handled by the Domain Master | |
| 154 * Browser. Similarly, the Domain Master Browser is always the Local Master | |
| 155 * Browser for the subnet it is on. | |
| 156 * | |
| 157 * When a browser client suspects that the Local Master Browser has failed, | |
| 158 * the client will instigate an election in which the browser servers | |
| 159 * participate, and some browser servers may change roles. | |
| 160 * | |
| 161 * Some characteristics of a good browsing mechanism include: | |
| 162 * . minimal network traffic | |
| 163 * . minimum server discovery time | |
| 164 * . minimum change discovery latency | |
| 165 * . immunity to machine failures | |
| 166 * | |
| 167 * Historically, Browser implementations had been very closely tied to | |
| 168 * NETBIOS and datagrams. The early implementations caused a lot of | |
| 169 * broadcast traffic. See Appendix D for an overview that presents how the | |
| 170 * Browser specification evolved. | |
| 171 * | |
| 172 * 4. Browsing Protocol Architecture | |
| 173 * | |
| 174 * This section first describes the how the browsing protocol is layered, | |
| 175 * then describes the roles of clients, servers, and browsers in the | |
| 176 * browsing subsystem. | |
| 177 * | |
| 178 * 4.1 Layering of Browsing Protocol Requests | |
| 179 * | |
| 180 * Most of the browser functionality is implemented using mailslots. | |
| 181 * Mailslots provide a mechanism for fast, unreliable unidirectional data | |
| 182 * transfer; they are named via ASCII "mailslot (path) name". Mailslots are | |
| 183 * implemented using the CIFS Transact SMB which is encapsulated in a | |
| 184 * NETBIOS datagram. Browser protocol requests are sent to browser specific | |
| 185 * mailslots using some browser-specific NETBIOS names. These datagrams can | |
| 186 * either be unicast or broadcast, depending on whether the NETBIOS name is | |
| 187 * a "unique name" or a "group name". Various data structures, which are | |
| 188 * detailed subsequently within this document, flow as the data portion of | |
| 189 * the Transact SMB. | |
| 190 * | |
| 191 * Here is an example of a generic browser SMB, showing how a browser | |
| 192 * request is encapsulated in a TRANSACT SMB request. Note that the PID, | |
| 193 * TID, MID, UID, and Flags are all 0 in mailslot requests. | |
| 194 * | |
| 195 * SMB: C transact, File = \MAILSLOT\BROWSE | |
| 196 * SMB: SMB Status = Error Success | |
| 197 * SMB: Error class = No Error | |
| 198 * SMB: Error code = No Error | |
| 199 * SMB: Header: PID = 0x0000 TID = 0x0000 MID = 0x0000 UID = 0x0000 | |
| 200 * SMB: Tree ID (TID) = 0 (0x0) | |
| 201 * SMB: Process ID (PID) = 0 (0x0) | |
| 202 * SMB: User ID (UID) = 0 (0x0) | |
| 203 * SMB: Multiplex ID (MID) = 0 (0x0) | |
| 204 * SMB: Flags Summary = 0 (0x0) | |
| 205 * SMB: Command = C transact | |
| 206 * SMB: Word count = 17 | |
| 207 * SMB: Word parameters | |
| 208 * SMB: Total parm bytes = 0 | |
| 209 * SMB: Total data bytes = 33 | |
| 210 * SMB: Max parm bytes = 0 | |
| 211 * SMB: Max data bytes = 0 | |
| 212 * SMB: Max setup words = 0 | |
| 213 * SMB: Transact Flags Summary = 0 (0x0) | |
| 214 * SMB: ...............0 = Leave session intact | |
| 215 * SMB: ..............0. = Response required | |
| 216 * SMB: Transact timeout = 0 (0x0) | |
| 217 * SMB: Parameter bytes = 0 (0x0) | |
| 218 * SMB: Parameter offset = 0 (0x0) | |
| 219 * SMB: Data bytes = 33 (0x21) | |
| 220 * SMB: Data offset = 86 (0x56) | |
| 221 * SMB: Setup word count = 3 | |
| 222 * SMB: Setup words | |
| 223 * SMB: Mailslot opcode = Write mailslot | |
| 224 * SMB: Transaction priority = 1 | |
| 225 * SMB: Mailslot class = Unreliable (broadcast) | |
| 226 * SMB: Byte count = 50 | |
| 227 * SMB: Byte parameters | |
| 228 * SMB: Path name = \MAILSLOT\BROWSE | |
| 229 * SMB: Transaction data | |
| 230 * SMB: Data: Number of data bytes remaining = 33 (0x0021) | |
| 231 * | |
| 232 * Note the SMB command is Transact, the opcode within the Transact SMB is | |
| 233 * Mailslot Write, and the browser data structure is carried as the | |
| 234 * Transact data. | |
| 235 * The Transaction data begins with an opcode, that signifies the operation | |
| 236 * and determines the size and structure of data that follows. This opcode | |
| 237 * is named as per one of the below: | |
| 238 * | |
| 239 * HostAnnouncement 1 | |
| 240 * AnnouncementRequest 2 | |
| 241 * RequestElection 8 | |
| 242 * GetBackupListReq 9 | |
| 243 * GetBackupListResp 10 | |
| 244 * BecomeBackup 11 | |
| 245 * DomainAnnouncment 12 | |
| 246 * MasterAnnouncement 13 | |
| 247 * LocalMasterAnnouncement 15 | |
| 248 * | |
| 249 * Browser datagrams are often referred to as simply browser frames. The | |
| 250 * frames are in particular, referred to by the name of the opcode within | |
| 251 * the Transaction data e.g. a GetBackupListReq browser frame, a | |
| 252 * RequestElection browser frame, etc. | |
| 253 * | |
| 254 * The structures that are sent as the data portion of the Transact SMB are | |
| 255 * described in section(s) 6.2 through 6.12 in this document. These | |
| 256 * structures are tightly packed, i.e. there are no intervening pad bytes | |
| 257 * in the structure, unless they are explicitly described as being there. | |
| 258 * All quantities are sent in native Intel format and multi-byte values are | |
| 259 * transmitted least significant byte first. | |
| 260 * | |
| 261 * Besides mailslots and Transaction SMBs, the other important piece of the | |
| 262 * browser architecture is the NetServerEnum2 request. This request that | |
| 263 * allows an application to interrogate a Browser Server and obtain a | |
| 264 * complete list of resources (servers, domains, etc) known to that Browser | |
| 265 * server. Details of the NetServerEnum2 request are presented in section | |
| 266 * 6.4. Some examples of the NetServerEnum2 request being used are when a | |
| 267 * Local Master Browser sends a NetServerEnum2 request to the Domain Master | |
| 268 * Browser and vice versa. Another example is when a browser client sends a | |
| 269 * NetServerEnum2 request to a Backup Browser server. | |
| 270 * | |
| 271 * 4.3 Non-Browser Server | |
| 272 * | |
| 273 * A non-browser server is a server that has some resource(s) or service(s) | |
| 274 * it wishes to advertise as being available using the browsing protocol. | |
| 275 * Examples of non-browser servers would be an SQL server, print server, | |
| 276 * etc. | |
| 277 * | |
| 278 * A non-browser server MUST periodically send a HostAnnouncement browser | |
| 279 * frame, specifying the type of resources or services it is advertising. | |
| 280 * Details are in section 6.5. | |
| 281 * | |
| 282 * A non-browser server SHOULD announce itself relatively frequently when | |
| 283 * it first starts up in order to make its presence quickly known to the | |
| 284 * browsers and thence to potential clients. The frequency of the | |
| 285 * announcements SHOULD then be gradually stretched, so as to minimize | |
| 286 * network traffic. Typically, non-browser servers announce themselves | |
| 287 * once every minute upon start up and then gradually adjust the frequency | |
| 288 * of the announcements to once every 12 minutes. | |
| 289 * | |
| 290 * A non-browser server SHOULD send a HostAnnouncement browser frame | |
| 291 * specifying a type of 0 just prior to shutting down, to allow it to | |
| 292 * quickly be removed from the list of available servers. | |
| 293 * | |
| 294 * A non-browser server MUST receive and process AnnouncementRequest frames | |
| 295 * from the Local Master Browser, and MUST respond with a HostAnnouncement | |
| 296 * frame, after a delay chosen randomly from the interval [0,30] seconds. | |
| 297 * AnnouncementRequests typically happen when a Local Master Browser starts | |
| 298 * up with an empty list of servers for the domain, and wants to fill it | |
| 299 * quickly. The 30 second range for responses prevents the Master Browser | |
| 300 * from becoming overloaded and losing replies, as well as preventing the | |
| 301 * network from being flooded with responses. | |
| 302 * | |
| 303 * 4.4 Browser Servers | |
| 304 * | |
| 305 * The following sections describe the roles of the various types of | |
| 306 * browser servers. | |
| 307 * | |
| 308 * 4.4.1 Potential Browser Server | |
| 309 * | |
| 310 * A Potential Browser server is a browser server that is capable of being | |
| 311 * a Backup Browser server or Master Browser server, but is not currently | |
| 312 * fulfilling either of those roles. | |
| 313 * | |
| 314 * A Potential Browser MUST set type SV_TYPE_POTENTIAL_BROWSER (see section | |
| 315 * 6.4.1) in its HostAnnouncement until it is ready to shut down. In its | |
| 316 * last HostAnnouncement frame before it shuts down, it SHOULD specify a | |
| 317 * type of 0. | |
| 318 * | |
| 319 * A Potential Browser server MUST receive and process BecomeBackup frames | |
| 320 * (see section 6.9) and become a backup browser upon their receipt. | |
| 321 * | |
| 322 * A Potential Browser MUST participate in browser elections (see section | |
| 323 * 6.8). | |
| 324 * | |
| 325 * 4.4.2 Backup Browser | |
| 326 * | |
| 327 * Backup Browser servers are a subset of the Potential Browsers that have | |
| 328 * been chosen by the Master Browser on their subnet to be the Backup | |
| 329 * Browsers for the subnet. | |
| 330 * | |
| 331 * A Backup Browser MUST set type SV_TYPE_BACKUP_BROWSER (see section | |
| 332 * 6.4.1) in its HostAnnouncement until it is ready to shut down. In its | |
| 333 * last HostAnnouncement frame before it shuts down, it SHOULD specify a | |
| 334 * type of 0. | |
| 335 * | |
| 336 * A Backup Browser MUST listen for a LocalMasterAnnouncement frame (see | |
| 337 * section 6.10) from the Local Master Browser, and use it to set the name | |
| 338 * of the Master Browser it queries for the server and domain lists. | |
| 339 * | |
| 340 * A Backup Browsers MUST periodically make a NetServerEnum2 request of | |
| 341 * the Master Browser on its subnet for its domain to get a list of servers | |
| 342 * in that domain, as well as a list of domains. The period is a | |
| 343 * configuration option balancing currency of the information with network | |
| 344 * traffic costs - a typical value is 15 minutes. | |
| 345 * | |
| 346 * A Backup Browser SHOULD force an election by sending a RequestElection | |
| 347 * frame (see section 6.7) if it does not get a response to its periodic | |
| 348 * NetServeEnum2 request to the Master Browser. | |
| 349 * | |
| 350 * A Backup Browser MUST receive and process NetServerEnum2 requests from | |
| 351 * browser clients, for its own domain and others. If the request is for a | |
| 352 * list of servers in its domain, or for a list of domains, it can answer | |
| 353 * from its internal lists. If the request is for a list of servers in a | |
| 354 * domain different than the one it serves, it sends a NetServerEnum2 | |
| 355 * request to the Domain Master Browser for that domain (which it can in | |
| 356 * find in its list of domains and their Domain Master Browsers). | |
| 357 * | |
| 358 * A Backup Browser MUST participate in browser elections (see section | |
| 359 * 6.8). | |
| 360 * | |
| 361 * 4.4.3 Master Browser | |
| 362 * | |
| 363 * Master Browsers are responsible for: | |
| 364 * . indicating it is a Master Browser | |
| 365 * . receiving server announcements and building a list of such servers | |
| 366 * and keeping it reasonably up-to-date. | |
| 367 * . returning lists of Backup Browsers to browser clients. | |
| 368 * . ensuring an appropriate number of Backup Browsers are available. | |
| 369 * . announcing their existence to other Master Browsers on their subnet, | |
| 370 * to the Domain Master Browser for their domain, and to all browsers in | |
| 371 * their domain on their subnet | |
| 372 * . forwarding requests for lists of servers on other domains to the | |
| 373 * Master Browser for that domain | |
| 374 * . keeping a list of domains in its subnet | |
| 375 * . synchronizing with the Domain Master Browser (if any) for its domain | |
| 376 * . participating in browser elections | |
| 377 * . ensuring that there is only one Master Browser on its subnet | |
| 378 * | |
| 379 * A Master Browser MUST set type SV_TYPE_MASTER_BROWSER (see section | |
| 380 * 6.4.1) in its HostAnnouncement until it is ready to shut down. In its | |
| 381 * last HostAnnouncement frame before it shuts down, it SHOULD specify a | |
| 382 * type of 0. | |
| 383 * | |
| 384 * A Master Browser MUST receive and process HostAnnouncement frames from | |
| 385 * servers, adding the server name and other information to its servers | |
| 386 * list; it must mark them as "local" entries. Periodically, it MUST check | |
| 387 * all local server entries to see if a server's HostAnnouncement has timed | |
| 388 * out (no HostAnnouncement received for three times the periodicity the | |
| 389 * server gave in the last received HostAnnouncement) and remove timed-out | |
| 390 * servers from its list. | |
| 391 * | |
| 392 * A Master Browser MUST receive and process DomainAnnouncement frames (see | |
| 393 * section 6.12) and maintain the domain names and their associated (Local) | |
| 394 * Master Browsers in its internal domain list until they time out; it must | |
| 395 * mark these as "local" entries. Periodically, it MUST check all local | |
| 396 * domain entries to see if a server's DomainAnnouncement has timed out (no | |
| 397 * DomainAnnouncement received for three times the periodicity the server | |
| 398 * gave in the last received DomainAnnouncement) and remove timed-out | |
| 399 * servers from its list. | |
| 400 * | |
| 401 * A Master Browser MUST receive and process GetBackupListRequest frames | |
| 402 * from clients, returning GetBackupListResponse frames containing a list | |
| 403 * of the Backup Servers for its domain. | |
| 404 * | |
| 405 * A Master Browser MUST eventually send BecomeBackup frames (see section | |
| 406 * 6.9) to one or more Potential Browser servers to increase the number of | |
| 407 * Backup Browsers if there are not enough Backup Browsers to handle the | |
| 408 * anticipated query load. Note: possible good times for checking for | |
| 409 * sufficient backup browsers are after being elected, when timing out | |
| 410 * server HostAnnouncements, and when receiving a server's HostAnnouncement | |
| 411 * for the first time. | |
| 412 * | |
| 413 * A Master Browser MUST periodically announce itself and the domain it | |
| 414 * serves to other (Local) Master Browsers on its subnet, by sending a | |
| 415 * DomainAnnouncement frame (see section 6.12) to its subnet. | |
| 416 * | |
| 417 * A Master Browser MUST send a MasterAnnouncement frame (see section 6.11) | |
| 418 * to the Domain Master Browser after it is first elected, and periodically | |
| 419 * thereafter. This informs the Domain Master Browser of the presence of | |
| 420 * all the Master Browsers. | |
| 421 * | |
| 422 * A Master Browser MUST periodically announce itself to all browsers for | |
| 423 * its domain on its subnet by sending a LocalMasterAnnouncement frame (see | |
| 424 * section 6.10). | |
| 425 * | |
| 426 * A Master Browser MUST receive and process NetServerEnum2 requests from | |
| 427 * browser clients, for its own domain and others. If the request is for a | |
| 428 * list of servers in its domain, or for a list of domains, it can answer | |
| 429 * from its internal lists. Entries in its list marked "local" MUST have | |
| 430 * the SV_TYPE_LOCAL_LIST_ONLY bit set in the returned results; it must be | |
| 431 * clear for all other entries. If the request is for a list of servers in | |
| 432 * a domain different than the one it serves, it sends a NetServerEnum2 | |
| 433 * request to the Domain Master Browser for that domain (which it can in | |
| 434 * find in its list of domains and their Domain Master Browsers). | |
| 435 * | |
| 436 * Note: The list of servers that the Master Browser maintains and | |
| 437 * returns to the Backup Browsers, is limited in size to 64K of | |
| 438 * data. This will limit the number of systems that can be in a | |
| 439 * browse list in a single workgroup or domain to approximately two | |
| 440 * thousand systems. | |
| 441 * | |
| 442 * A Master Browser SHOULD request all servers to register with it by | |
| 443 * sending an AnnouncementRequest frame, if, on becoming the Master Browser | |
| 444 * by winning an election, its server list is empty. Otherwise, clients | |
| 445 * might get an incomplete list of servers until the servers' periodic | |
| 446 * registrations fill the server list. | |
| 447 * | |
| 448 * If the Master Browser on a subnet is not the Primary Domain Controller | |
| 449 * (PDC), then it is a Local Master Browser. | |
| 450 * | |
| 451 * A Local Master Browser MUST periodically synchronize with the Domain | |
| 452 * Master Browser (which is the PDC). This synchronization is performed by | |
| 453 * making a NetServerEnum2 request to the Domain Master Browser and merging | |
| 454 * the results with its list of servers and domains. An entry from the | |
| 455 * Domain Master Browser should be marked "non-local", and must not | |
| 456 * overwrite an entry with the same name marked "local". The Domain Master | |
| 457 * Browser is located as specified in Appendix B. | |
| 458 * | |
| 459 * A Master Browser MUST participate in browser elections (see section | |
| 460 * 6.8). | |
| 461 * | |
| 462 * A Master Browser MUST, if it receives a HostAnnouncement, | |
| 463 * DomainAnnouncement, or LocalMasterAnnouncement frame another system that | |
| 464 * claims to be the Master Browser for its domain, demote itself from | |
| 465 * Master Browser and force an election. This ensures that there is only | |
| 466 * ever one Master Browser in each workgroup or domain. | |
| 467 * | |
| 468 * A Master Browser SHOULD, if it loses an election, become a Backup | |
| 469 * Browser (without being told to do so by the new Master Browser). Since | |
| 470 * it has more up-to-date information in its lists than a Potential | |
| 471 * Browser, it is more efficient to have it be a Backup Browser than to | |
| 472 * promote a Potential Browser. | |
| 473 * | |
| 474 * 4.4.3.1 Preferred Master Browser | |
| 475 * | |
| 476 * A Preferred Master Browser supports exactly the same protocol elements | |
| 477 * as a Potential Browser, except as follows. | |
| 478 * | |
| 479 * A Preferred Master Browser MUST always force an election when it starts | |
| 480 * up. | |
| 481 * | |
| 482 * A Preferred Master Browser MUST participate in browser elections (see | |
| 483 * section 6.8). | |
| 484 * | |
| 485 * A Preferred Master Browser MUST set the Preferred Master bit in the | |
| 486 * RequestElection frame (see section 6.7) to bias the election in its | |
| 487 * favor. | |
| 488 * | |
| 489 * A Preferred Master Browser SHOULD, if it loses an election, | |
| 490 * automatically become a Backup Browser, without being told to do so by | |
| 491 * the Master Browser. | |
| 492 * | |
| 493 * 4.4.4 Domain Master Browser | |
| 494 * | |
| 495 * Since the Domain Master Browser always runs on the PDC, it must | |
| 496 * implement all the protocols required of a PDC in addition to the | |
| 497 * browsing protocol, and that is way beyond the scope of this | |
| 498 * specification. | |
| 499 * | |
| 500 * 5. Mailslot Protocol Specification | |
| 501 * | |
| 502 * The only transaction allowed to a mailslot is a mailslot write. Mailslot | |
| 503 * writes requests are encapsulated in TRANSACT SMBs. The following table | |
| 504 * shows the interpretation of the TRANSACT SMB parameters for a mailslot | |
| 505 * transaction: | |
| 506 * | |
| 507 * Name Value Description | |
| 508 * Command SMB_COM_TRANSACTION | |
| 509 * Name <name> STRING name of mail slot to write; | |
| 510 * must start with "\\MAILSLOT\\" | |
| 511 * SetupCount 3 Always 3 for mailslot writes | |
| 512 * Setup[0] 1 Command code == write mailslot | |
| 513 * Setup[1] Ignored | |
| 514 * Setup[2] Ignored | |
| 515 * TotalDataCount n Size of data in bytes to write to | |
| 516 * the mailslot | |
| 517 * Data[ n ] The data to write to the mailslot | |
| 518 * | |
| 519 */ | |
| 520 | |
| 521 /* | |
| 522 * SMB: C transact, File = \MAILSLOT\BROWSE | |
| 523 * SMB: SMB Status = Error Success | |
| 524 * SMB: Error class = No Error | |
| 525 * SMB: Error code = No Error | |
| 526 * SMB: Header: PID = 0x0000 TID = 0x0000 MID = 0x0000 UID = 0x0000 | |
| 527 * SMB: Tree ID (TID) = 0 (0x0) | |
| 528 * SMB: Process ID (PID) = 0 (0x0) | |
| 529 * SMB: User ID (UID) = 0 (0x0) | |
| 530 * SMB: Multiplex ID (MID) = 0 (0x0) | |
| 531 * SMB: Flags Summary = 0 (0x0) | |
| 532 * SMB: Command = C transact | |
| 533 * SMB: Word count = 17 | |
| 534 * SMB: Word parameters | |
| 535 * SMB: Total parm bytes = 0 | |
| 536 * SMB: Total data bytes = 33 | |
| 537 * SMB: Max parm bytes = 0 | |
| 538 * SMB: Max data bytes = 0 | |
| 539 * SMB: Max setup words = 0 | |
| 540 * SMB: Transact Flags Summary = 0 (0x0) | |
| 541 * SMB: ...............0 = Leave session intact | |
| 542 * SMB: ..............0. = Response required | |
| 543 * SMB: Transact timeout = 0 (0x0) | |
| 544 * SMB: Parameter bytes = 0 (0x0) | |
| 545 * SMB: Parameter offset = 0 (0x0) | |
| 546 * SMB: Data bytes = 33 (0x21) | |
| 547 * SMB: Data offset = 86 (0x56) | |
| 548 * SMB: Setup word count = 3 | |
| 549 * SMB: Setup words | |
| 550 * SMB: Mailslot opcode = Write mailslot | |
| 551 * SMB: Transaction priority = 1 | |
| 552 * SMB: Mailslot class = Unreliable (broadcast) | |
| 553 * SMB: Byte count = 50 | |
| 554 * SMB: Byte parameters | |
| 555 * SMB: Path name = \MAILSLOT\BROWSE | |
| 556 * SMB: Transaction data | |
| 557 * SMB: Data: Number of data bytes remaining = 33 (0x0021) | |
| 558 * | |
| 559 * 5. Mailslot Protocol Specification | |
| 560 * | |
| 561 * The only transaction allowed to a mailslot is a mailslot write. Mailslot | |
| 562 * writes requests are encapsulated in TRANSACT SMBs. The following table | |
| 563 * shows the interpretation of the TRANSACT SMB parameters for a mailslot | |
| 564 * transaction: | |
| 565 * | |
| 566 * Name Value Description | |
| 567 * Command SMB_COM_TRANSACTION | |
| 568 * Name <name> STRING name of mail slot to write; | |
| 569 * must start with "\MAILSLOT\" | |
| 570 * SetupCount 3 Always 3 for mailslot writes | |
| 571 * Setup[0] 1 Command code == write mailslot | |
| 572 * Setup[1] Ignored | |
| 573 * Setup[2] Ignored | |
| 574 * TotalDataCount n Size of data in bytes to write to | |
| 575 * the mailslot | |
| 576 * Data[ n ] The data to write to the mailslot | |
| 577 * | |
| 578 * Magic 0xFF 'S' 'M' 'B' | |
| 579 * smb_com a byte, the "first" command | |
| 580 * Error a 4-byte union, ignored in a request | |
| 581 * smb_flg a one byte set of eight flags | |
| 582 * smb_flg2 a two byte set of 16 flags | |
| 583 * . twelve reserved bytes, have a role | |
| 584 * in connectionless transports (IPX, UDP?) | |
| 585 * smb_tid a 16-bit tree ID, a mount point sorta, | |
| 586 * 0xFFFF is this command does not have | |
| 587 * or require a tree context | |
| 588 * smb_pid a 16-bit process ID | |
| 589 * smb_uid a 16-bit user ID, specific to this "session" | |
| 590 * and mapped to a system (bona-fide) UID | |
| 591 * smb_mid a 16-bit multiplex ID, used to differentiate | |
| 592 * multiple simultaneous requests from the same | |
| 593 * process (pid) (ref RPC "xid") | |
| 594 */ | |
| 595 | |
| 596 int | |
| 597 smb_browser_load_transact_header(unsigned char *buffer, int maxcnt, | |
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598 int data_count, int reply, char *mailbox) |
| 5331 | 599 { |
| 600 smb_msgbuf_t mb; | |
| 601 int mailboxlen; | |
| 602 char *fmt; | |
| 603 int result; | |
| 604 short class = (reply == ONE_WAY_TRANSACTION) ? 2 : 0; | |
| 605 | |
| 606 /* | |
| 607 * If the mailboxlen is an even number we need to pad the | |
| 608 * header so that the data starts on a word boundary. | |
| 609 */ | |
| 610 fmt = "Mb4.bw20.bwwwwb.wl2.wwwwb.wwwws"; | |
| 611 mailboxlen = strlen(mailbox) + 1; | |
| 612 | |
| 613 if ((mailboxlen & 0x01) == 0) { | |
| 614 ++mailboxlen; | |
| 615 fmt = "Mb4.bw20.bwwwwb.wl2.wwwwb.wwwws."; | |
| 616 } | |
| 617 | |
| 618 bzero(buffer, maxcnt); | |
| 619 smb_msgbuf_init(&mb, buffer, maxcnt, 0); | |
| 620 | |
| 621 result = smb_msgbuf_encode(&mb, fmt, | |
| 622 SMB_COM_TRANSACTION, /* Command */ | |
| 623 0x18, | |
| 624 0x3, | |
| 625 17, /* Count of parameter words */ | |
| 626 0, /* Total Parameter words sent */ | |
| 627 data_count, /* Total Data bytes sent */ | |
| 628 2, /* Max Parameters to return */ | |
| 629 0, /* Max data bytes to return */ | |
| 630 0, /* Max setup bytes to return */ | |
| 631 reply, /* No reply */ | |
| 632 0xffffffff, /* Timeout */ | |
| 633 0, /* Parameter bytes sent */ | |
| 634 0, /* Parameter offset */ | |
| 635 data_count, /* Data bytes sent */ | |
| 636 69 + mailboxlen, /* Data offset */ | |
| 637 3, /* Setup word count */ | |
| 638 1, /* Setup word[0] */ | |
| 639 0, /* Setup word[1] */ | |
| 640 class, /* Setup word[2] */ | |
| 641 mailboxlen + data_count, /* Total request bytes */ | |
| 642 mailbox); /* Mailbox address */ | |
| 643 | |
| 644 smb_msgbuf_term(&mb); | |
| 645 return (result); | |
| 646 } | |
| 647 | |
| 648 static int | |
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649 smb_browser_addr_of_subnet(struct name_entry *name, smb_hostinfo_t *hinfo, |
| 5331 | 650 struct name_entry *result) |
| 651 { | |
| 652 uint32_t ipaddr, mask, saddr; | |
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653 addr_entry_t *addr; |
| 5331 | 654 |
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655 if (name == NULL) |
| 5331 | 656 return (-1); |
| 657 | |
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658 if (hinfo->hi_nic.nic_smbflags & SMB_NICF_ALIAS) |
| 5331 | 659 return (-1); |
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660 |
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661 ipaddr = hinfo->hi_nic.nic_ip.a_ipv4; |
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662 mask = hinfo->hi_nic.nic_mask; |
| 5331 | 663 |
| 664 *result = *name; | |
| 665 addr = &name->addr_list; | |
| 666 do { | |
| 667 saddr = addr->sin.sin_addr.s_addr; | |
| 668 if ((saddr & mask) == (ipaddr & mask)) { | |
| 669 *result = *name; | |
| 670 result->addr_list = *addr; | |
| 671 result->addr_list.forw = result->addr_list.back = | |
| 672 &result->addr_list; | |
| 673 return (0); | |
| 674 } | |
| 675 addr = addr->forw; | |
| 676 } while (addr != &name->addr_list); | |
| 677 | |
| 678 return (-1); | |
| 679 } | |
| 680 | |
| 681 | |
| 682 static int | |
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683 smb_browser_bcast_addr_of_subnet(struct name_entry *name, uint32_t bcast, |
| 5331 | 684 struct name_entry *result) |
| 685 { | |
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686 if (name != NULL && name != result) |
| 5331 | 687 *result = *name; |
| 688 | |
| 689 result->addr_list.sin.sin_family = AF_INET; | |
| 690 result->addr_list.sinlen = sizeof (result->addr_list.sin); | |
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691 result->addr_list.sin.sin_addr.s_addr = bcast; |
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692 result->addr_list.sin.sin_port = htons(IPPORT_NETBIOS_DGM); |
| 5331 | 693 result->addr_list.forw = result->addr_list.back = &result->addr_list; |
| 694 return (0); | |
| 695 } | |
| 696 | |
| 697 /* | |
| 698 * 6.5 HostAnnouncement Browser Frame | |
| 699 * | |
| 700 * To advertise its presence, i.e. to publish itself as being available, a | |
| 701 * non-browser server sends a HostAnnouncement browser frame. If the server | |
| 702 * is a member of domain "D", this frame is sent to the NETBIOS unique name | |
| 703 * D(1d) and mailslot "\\MAILSLOT\\BROWSE". The definition of the | |
| 704 * HostAnnouncement frame is: | |
| 705 * | |
| 706 * struct { | |
| 707 * unsigned short Opcode; | |
| 708 * unsigned char UpdateCount; | |
| 709 * uint32_t Periodicity; | |
| 710 * unsigned char ServerName[]; | |
| 711 * unsigned char VersionMajor; | |
| 712 * unsigned char VersionMinor; | |
| 713 * uint32_t Type; | |
| 714 * uint32_t Signature; | |
| 715 * unsigned char Comment[]; | |
| 716 * } | |
| 717 * | |
| 718 * where: | |
| 719 * Opcode - Identifies this structure as a browser server | |
| 720 * announcement and is defined as HostAnnouncement with a | |
| 721 * value of decimal 1. | |
| 722 * | |
| 723 * UpdateCount - must be sent as zero and ignored on receipt. | |
| 724 * | |
| 725 * Periodicity - The announcement frequency of the server (in | |
| 726 * seconds). The server will be removed from the browse list | |
| 727 * if it has not been heard from in 3X its announcement | |
| 728 * frequency. In no case will the server be removed from the | |
| 729 * browse list before the period 3X has elapsed. Actual | |
| 730 * implementations may take more than 3X to actually remove | |
| 731 * the server from the browse list. | |
| 732 * | |
| 733 * ServerName - Null terminated ASCII server name (up to 16 bytes | |
| 734 * in length). | |
| 735 * | |
| 736 * VersionMajor - The major version number of the OS the server | |
| 737 * is running. it will be returned by NetServerEnum2. | |
| 738 * | |
| 739 * VersionMinor - The minor version number of the OS the server | |
| 740 * is running. This is entirely informational and does not | |
| 741 * have any significance for the browsing protocol. | |
| 742 * | |
| 743 * Type - Specifies the type of the server. The server type bits | |
| 744 * are specified in the NetServerEnum2 section. | |
| 745 * | |
| 746 * Signature - The browser protocol minor version number in the | |
| 747 * low 8 bits, the browser protocol major version number in | |
| 748 * the next higher 8 bits and the signature 0xaa55 in the | |
| 749 * high 16 bits of this field. Thus, for this version of the | |
| 750 * browser protocol (1.15) this field has the value | |
| 751 * 0xaa55010f. This may used to isolate browser servers that | |
| 752 * are running out of revision browser software; otherwise, | |
| 753 * it is ignored. | |
| 754 * | |
| 755 * Comment - Null terminated ASCII comment for the server. | |
| 756 * Limited to 43 bytes. | |
| 757 * | |
| 758 * When a non-browser server starts up, it announces itself in the manner | |
| 759 * described once every minute. The frequency of these statements is | |
| 760 * gradually stretched to once every 12 minutes. | |
| 761 * | |
| 762 * Note: older non-browser servers in a domain "D" sent HostAnnouncement | |
| 763 * frames to the NETBIOS group name D(00). Non-Browser servers supporting | |
| 764 * version 1.15 of the browsing protocol SHOULD NOT use this NETBIOS name, | |
| 765 * but for backwards compatibility Master Browsers MAY receive and process | |
| 766 * HostAnnouncement frames on this name as described above for D(1d). | |
| 767 */ | |
| 768 | |
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769 static void |
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770 smb_browser_send_HostAnnouncement(smb_hostinfo_t *hinfo, |
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771 uint32_t next_announcement, boolean_t remove, |
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772 addr_entry_t *addr, char suffix) |
| 5331 | 773 { |
| 774 smb_msgbuf_t mb; | |
| 775 int offset, announce_len, data_length; | |
| 776 struct name_entry dest_name; | |
| 777 unsigned char *buffer; | |
| 778 uint32_t type; | |
| 779 char resource_domain[SMB_PI_MAX_DOMAIN]; | |
| 780 | |
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781 if (smb_getdomainname(resource_domain, SMB_PI_MAX_DOMAIN) != 0) |
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782 return; |
| 5331 | 783 (void) utf8_strupr(resource_domain); |
| 784 | |
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785 if (addr == NULL) { |
| 5331 | 786 /* Local master Browser */ |
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787 smb_init_name_struct((unsigned char *)resource_domain, suffix, |
| 5331 | 788 0, 0, 0, 0, 0, &dest_name); |
|
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789 if (smb_browser_bcast_addr_of_subnet(0, hinfo->hi_nic.nic_bcast, |
|
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790 &dest_name) < 0) |
| 5331 | 791 return; |
| 792 } else { | |
|
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793 smb_init_name_struct((unsigned char *)resource_domain, suffix, |
| 5331 | 794 0, 0, 0, 0, 0, &dest_name); |
| 795 dest_name.addr_list = *addr; | |
| 796 dest_name.addr_list.forw = dest_name.addr_list.back = | |
| 797 &dest_name.addr_list; | |
| 798 } | |
| 799 | |
| 800 /* give some extra room */ | |
|
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801 buffer = malloc(MAX_DATAGRAM_LENGTH * 2); |
|
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802 if (buffer == NULL) { |
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803 syslog(LOG_DEBUG, "smb browser: HostAnnouncement: %m"); |
| 5331 | 804 return; |
| 805 } | |
| 806 | |
|
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807 data_length = 1 + 1 + 4 + 16 + 1 + 1 + 4 + 4 + |
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808 strlen(hinfo->hi_nic.nic_cmnt) + 1; |
| 5331 | 809 |
|
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810 offset = smb_browser_load_transact_header(buffer, |
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811 MAX_DATAGRAM_LENGTH, data_length, ONE_WAY_TRANSACTION, |
|
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812 MAILSLOT_BROWSE); |
| 5331 | 813 |
|
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814 if (offset < 0) { |
| 5331 | 815 free(buffer); |
| 816 return; | |
| 817 } | |
| 818 | |
| 819 /* | |
| 820 * A non-browser server SHOULD send a HostAnnouncement browser frame | |
| 821 * specifying a type of 0 just prior to shutting down, to allow it to | |
| 822 * quickly be removed from the list of available servers. | |
| 823 */ | |
|
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824 if (remove || (!smb_netbios_running())) |
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825 type = 0; |
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826 else |
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827 type = hinfo->hi_type; |
| 5331 | 828 |
| 829 smb_msgbuf_init(&mb, buffer + offset, MAX_DATAGRAM_LENGTH - offset, 0); | |
|
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830 |
| 5331 | 831 announce_len = smb_msgbuf_encode(&mb, "bbl16cbblls", |
|
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832 HOST_ANNOUNCEMENT, |
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833 ++hinfo->hi_updatecnt, |
| 5331 | 834 next_announcement * 60000, /* Periodicity in MilliSeconds */ |
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835 hinfo->hi_nbname, |
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836 SMB_VERSION_MAJOR, |
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837 SMB_VERSION_MINOR, |
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838 type, |
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839 SMB_SERVER_SIGNATURE, |
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840 hinfo->hi_nic.nic_cmnt); |
| 5331 | 841 |
| 842 if (announce_len > 0) | |
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843 (void) smb_netbios_datagram_send(&hinfo->hi_netname, &dest_name, |
| 5331 | 844 buffer, offset + announce_len); |
| 845 | |
| 846 free(buffer); | |
| 847 smb_msgbuf_term(&mb); | |
| 848 } | |
| 849 | |
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850 static void |
| 5331 | 851 smb_browser_process_AnnouncementRequest(struct datagram *datagram, |
| 852 char *mailbox) | |
| 853 { | |
|
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854 smb_hostinfo_t *hinfo; |
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855 uint32_t next_announcement; |
| 5331 | 856 uint32_t delay = random() % 29; /* in seconds */ |
|
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857 boolean_t h_found = B_FALSE; |
| 5331 | 858 |
|
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859 if (strcmp(mailbox, MAILSLOT_LANMAN) != 0) { |
|
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860 syslog(LOG_DEBUG, "smb browser: wrong mailbox (%s)", mailbox); |
| 5331 | 861 return; |
| 862 } | |
| 863 | |
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864 smb_netbios_sleep(delay); |
| 5331 | 865 |
|
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866 (void) rw_rdlock(&smb_binfo.bi_hlist_rwl); |
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867 hinfo = list_head(&smb_binfo.bi_hlist); |
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868 while (hinfo) { |
|
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869 if ((hinfo->hi_nic.nic_ip.a_ipv4 & |
|
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870 hinfo->hi_nic.nic_mask) == |
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871 (datagram->src.addr_list.sin.sin_addr.s_addr & |
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872 hinfo->hi_nic.nic_mask)) { |
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873 h_found = B_TRUE; |
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874 break; |
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875 } |
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876 hinfo = list_next(&smb_binfo.bi_hlist, hinfo); |
| 5331 | 877 } |
|
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878 |
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879 if (h_found) { |
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880 next_announcement = hinfo->hi_nextannouce * 60 * 1000; |
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881 smb_browser_send_HostAnnouncement(hinfo, next_announcement, |
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882 B_FALSE, &datagram->src.addr_list, NBT_MB); |
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883 } |
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884 (void) rw_unlock(&smb_binfo.bi_hlist_rwl); |
| 5331 | 885 } |
| 886 | |
| 887 void * | |
| 888 smb_browser_dispatch(void *arg) | |
| 889 { | |
| 890 struct datagram *datagram = (struct datagram *)arg; | |
| 891 smb_msgbuf_t mb; | |
| 892 int rc; | |
| 893 unsigned char command; | |
| 894 unsigned char parameter_words; | |
| 895 unsigned short total_parameter_words; | |
| 896 unsigned short total_data_count; | |
| 897 unsigned short max_parameters_to_return; | |
| 898 unsigned short max_data_to_return; | |
| 899 unsigned char max_setup_bytes_to_return; | |
| 900 unsigned short reply; | |
| 901 unsigned short parameter_bytes_sent; | |
| 902 unsigned short parameter_offset; | |
| 903 unsigned short data_bytes_sent; | |
| 904 unsigned short data_offset; | |
| 905 unsigned char setup_word_count; | |
| 906 unsigned short setup_word_0; | |
| 907 unsigned short setup_word_1; | |
| 908 unsigned short setup_word_2; | |
| 909 unsigned short total_request_bytes; | |
| 910 char *mailbox; | |
| 911 unsigned char message_type; | |
| 912 unsigned char *data; | |
| 913 int datalen; | |
| 914 | |
|
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915 syslog(LOG_DEBUG, "smb browser: packet received"); |
| 5331 | 916 |
| 917 smb_msgbuf_init(&mb, datagram->data, datagram->data_length, 0); | |
| 918 rc = smb_msgbuf_decode(&mb, "Mb27.bwwwwb.w6.wwwwb.wwwws", | |
| 919 &command, /* Command */ | |
| 920 ¶meter_words, /* Count of parameter words */ | |
| 921 &total_parameter_words, /* Total Parameter words sent */ | |
| 922 &total_data_count, /* Total Data bytes sent */ | |
| 923 &max_parameters_to_return, /* Max Parameters to return */ | |
| 924 &max_data_to_return, /* Max data bytes to return */ | |
| 925 &max_setup_bytes_to_return, /* Max setup bytes to return */ | |
| 926 &reply, /* No reply */ | |
| 927 ¶meter_bytes_sent, /* Parameter bytes sent */ | |
| 928 ¶meter_offset, /* Parameter offset */ | |
| 929 &data_bytes_sent, /* Data bytes sent */ | |
| 930 &data_offset, /* Data offset */ | |
| 931 &setup_word_count, /* Setup word count */ | |
| 932 &setup_word_0, /* Setup word[0] */ | |
| 933 &setup_word_1, /* Setup word[1] */ | |
| 934 &setup_word_2, /* Setup word[2] */ | |
| 935 &total_request_bytes, /* Total request bytes */ | |
| 936 &mailbox); /* Mailbox address */ | |
| 937 | |
| 938 if (rc < 0) { | |
|
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939 syslog(LOG_ERR, "smb browser: decode error"); |
| 5331 | 940 smb_msgbuf_term(&mb); |
| 941 free(datagram); | |
| 942 return (0); | |
| 943 } | |
| 944 | |
| 945 data = &datagram->data[data_offset]; | |
| 946 datalen = datagram->data_length - data_offset; | |
| 947 | |
| 948 /* | |
| 949 * The PDC location protocol, i.e. anything on the \\NET | |
| 950 * mailslot, is handled by the smb_netlogon module. | |
| 951 */ | |
| 952 if (strncasecmp("\\MAILSLOT\\NET\\", mailbox, 14) == 0) { | |
| 953 smb_netlogon_receive(datagram, mailbox, data, datalen); | |
| 954 smb_msgbuf_term(&mb); | |
| 955 free(datagram); | |
| 956 return (0); | |
| 957 } | |
| 958 | |
| 959 /* | |
| 960 * If it's not a netlogon message, assume it's a browser request. | |
| 961 * This is not the most elegant way to extract the command byte | |
| 962 * but at least we no longer use it to get the netlogon opcode. | |
| 963 */ | |
| 964 message_type = datagram->data[data_offset]; | |
| 965 | |
| 966 switch (message_type) { | |
| 967 case ANNOUNCEMENT_REQUEST : | |
| 968 smb_browser_process_AnnouncementRequest(datagram, mailbox); | |
| 969 break; | |
| 970 | |
| 971 default: | |
|
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972 syslog(LOG_DEBUG, "smb browser: invalid message type(%d, %x)", |
| 5331 | 973 message_type, message_type); |
| 974 break; | |
| 975 } | |
| 976 | |
| 977 smb_msgbuf_term(&mb); | |
| 978 free(datagram); | |
| 979 return (0); | |
| 980 } | |
| 981 | |
| 982 | |
| 983 /* | |
| 984 * 11.1 Registered unique names | |
| 985 * | |
| 986 * <COMPUTER>(00) | |
| 987 * This name is used by all servers and clients to receive second | |
| 988 * class mailslot messages. A system must add this name in order to | |
| 989 * receive mailslot messages. The only browser requests that should | |
| 990 * appear on this name are BecomeBackup, GetBackupListResp, | |
| 991 * MasterAnnouncement, and LocalMasterAnnouncement frames. All other | |
| 992 * datagrams (other than the expected non-browser datagrams) may be | |
| 993 * ignored and an error logged. | |
| 994 * | |
| 995 * <DOMAIN>(1d) | |
| 996 * This name is used to identify a master browser server for domain | |
| 997 * "DOMAIN" on a subnet. A master browser server adds this name as a | |
| 998 * unique NETBIOS name when it becomes master browser. If the attempt | |
| 999 * to add the name fails, the master browser server assumes that there | |
| 1000 * is another master in the domain and will fail to come up. It may | |
| 1001 * log an error if the failure occurs more than 3 times in a row (this | |
| 1002 * either indicates some form of network misconfiguration or a | |
| 1003 * software error). The only requests that should appear on this name | |
| 1004 * are GetBackupListRequest and HostAnnouncement requests. All other | |
| 1005 * datagrams on this name may be ignored (and an error logged). If | |
| 1006 * running a NETBIOS name service (NBNS, such as WINS), this name | |
| 1007 * should not be registered with the NBNS. | |
| 1008 * | |
| 1009 * <DOMAIN>(1b) | |
| 1010 * This name is used to identify the Domain Master Browser for domain | |
| 1011 * "DOMAIN" (which is also the primary domain controller). It is a | |
| 1012 * unique name added only by the primary domain controller. The | |
| 1013 * primary domain controller will respond to GetBackupListRequest on | |
| 1014 * this name just as it responds to these requests on the <DOMAIN>(1d) | |
| 1015 * name. | |
| 1016 * | |
| 1017 * 11.2 Registered group names | |
| 1018 * | |
| 1019 * (01)(02)__MSBROWSE__(02)(01) | |
| 1020 * This name is used by Master Browsers to announce themselves to the | |
| 1021 * other Master Browsers on a subnet. It is added as a group name by | |
| 1022 * all Master Browser servers. The only broadcasts that should appear | |
| 1023 * on this name is DomainAnnouncement requests. All other datagrams | |
| 1024 * can be ignored. | |
| 1025 * | |
| 1026 * <DOMAIN>(00) | |
| 1027 * This name is used by clients and servers in domain "DOMAIN" to | |
| 1028 * process server announcements. The only requests that should appear | |
| 1029 * on this name that the browser is interested in are | |
| 1030 * AnnouncementRequest and NETLOGON_QUERY (to locate the PDC) packets. | |
| 1031 * All other unidentifiable requests may be ignored (and an error | |
| 1032 * logged). | |
| 1033 * | |
| 1034 * <DOMAIN>(1E) | |
| 1035 * This name is used for announcements to browsers for domain "DOMAIN" | |
| 1036 * on a subnet. This name is registered by all the browser servers in | |
| 1037 * the domain. The only requests that should appear on this name are | |
| 1038 * RequestElection and AnnouncementRequest packets. All other | |
| 1039 * datagrams may be ignored (and an error logged). | |
| 1040 * | |
| 1041 * <DOMAIN>(1C) | |
| 1042 * This name is registered by Primary Domain Controllers. | |
| 1043 */ | |
| 1044 | |
|
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1045 static void |
| 5331 | 1046 smb_browser_config(void) |
| 1047 { | |
|
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1048 smb_hostinfo_t *hinfo; |
| 5331 | 1049 struct name_entry name; |
| 1050 struct name_entry master; | |
| 1051 struct name_entry dest; | |
| 1052 struct name_entry *entry; | |
| 1053 char resource_domain[SMB_PI_MAX_DOMAIN]; | |
|
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1054 int rc; |
| 5331 | 1055 |
|
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1056 if (smb_browser_init() != 0) |
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1057 return; |
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1058 |
|
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1059 if (smb_getdomainname(resource_domain, SMB_PI_MAX_DOMAIN) != 0) |
|
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1060 return; |
| 5331 | 1061 (void) utf8_strupr(resource_domain); |
| 1062 | |
| 1063 /* domain<00> */ | |
|
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1064 smb_init_name_struct((unsigned char *)resource_domain, NBT_WKSTA, |
| 5331 | 1065 0, 0, 0, 0, 0, &name); |
| 1066 entry = smb_name_find_name(&name); | |
| 1067 smb_name_unlock_name(entry); | |
| 1068 | |
|
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1069 (void) rw_rdlock(&smb_binfo.bi_hlist_rwl); |
|
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1070 hinfo = list_head(&smb_binfo.bi_hlist); |
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1071 while (hinfo) { |
|
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1072 smb_init_name_struct((unsigned char *)resource_domain, |
|
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1073 NBT_WKSTA, 0, hinfo->hi_nic.nic_ip.a_ipv4, |
|
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1074 htons(IPPORT_NETBIOS_DGM), NAME_ATTR_GROUP, |
|
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1075 NAME_ATTR_LOCAL, &name); |
| 5331 | 1076 (void) smb_name_add_name(&name); |
|
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1077 |
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1078 hinfo = list_next(&smb_binfo.bi_hlist, hinfo); |
| 5331 | 1079 } |
|
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1080 (void) rw_unlock(&smb_binfo.bi_hlist_rwl); |
| 5331 | 1081 |
| 1082 /* All our local master browsers */ | |
|
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1083 smb_init_name_struct((unsigned char *)resource_domain, NBT_MB, |
| 5331 | 1084 0, 0, 0, 0, 0, &dest); |
| 1085 entry = smb_name_find_name(&dest); | |
| 1086 | |
| 1087 if (entry) { | |
|
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1088 (void) rw_rdlock(&smb_binfo.bi_hlist_rwl); |
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1089 hinfo = list_head(&smb_binfo.bi_hlist); |
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1090 while (hinfo) { |
|
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1091 rc = smb_browser_addr_of_subnet(entry, hinfo, &master); |
|
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1092 if (rc == 0) { |
| 5331 | 1093 syslog(LOG_DEBUG, |
|
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1094 "smb browser: master browser found at %s", |
| 5331 | 1095 inet_ntoa(master.addr_list.sin.sin_addr)); |
| 1096 } | |
|
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1097 hinfo = list_next(&smb_binfo.bi_hlist, hinfo); |
| 5331 | 1098 } |
|
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1099 (void) rw_unlock(&smb_binfo.bi_hlist_rwl); |
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1100 |
| 5331 | 1101 smb_name_unlock_name(entry); |
| 1102 } | |
|
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1103 |
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1104 /* Domain master browser */ |
| 5331 | 1105 smb_init_name_struct((unsigned char *)resource_domain, |
|
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1106 NBT_DMB, 0, 0, 0, 0, 0, &dest); |
| 5331 | 1107 |
| 1108 if ((entry = smb_name_find_name(&dest)) != 0) { | |
|
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1109 syslog(LOG_DEBUG, |
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1110 "smb browser: domain master browser for %s is %s", |
| 5331 | 1111 resource_domain, |
| 1112 inet_ntoa(entry->addr_list.sin.sin_addr)); | |
| 1113 smb_name_unlock_name(entry); | |
| 1114 } | |
| 1115 } | |
| 1116 | |
|
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1117 static int |
|
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1118 smb_browser_init(void) |
| 5331 | 1119 { |
|
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1120 smb_hostinfo_t *hinfo; |
|
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1121 smb_niciter_t ni; |
|
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1122 uint32_t type; |
|
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1123 |
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1124 (void) rw_wrlock(&smb_binfo.bi_hlist_rwl); |
|
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1125 smb_browser_infofree(); |
| 5331 | 1126 |
|
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1127 if (smb_nic_getfirst(&ni) != 0) { |
|
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1128 (void) rw_unlock(&smb_binfo.bi_hlist_rwl); |
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1129 return (-1); |
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1130 } |
| 5331 | 1131 |
|
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1132 type = MY_SERVER_TYPE; |
|
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1133 if (smb_config_get_secmode() == SMB_SECMODE_DOMAIN) |
|
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1134 type |= SV_DOMAIN_MEMBER; |
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1135 |
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1136 do { |
|
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1137 if ((ni.ni_nic.nic_smbflags & SMB_NICF_NBEXCL) || |
|
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1138 (ni.ni_nic.nic_smbflags & SMB_NICF_ALIAS)) |
| 5331 | 1139 continue; |
| 1140 | |
|
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1141 hinfo = malloc(sizeof (smb_hostinfo_t)); |
|
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1142 if (hinfo == NULL) { |
|
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1143 smb_browser_infofree(); |
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1144 (void) rw_unlock(&smb_binfo.bi_hlist_rwl); |
|
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1145 return (-1); |
|
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|
1146 } |
| 5331 | 1147 |
|
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1148 hinfo->hi_nic = ni.ni_nic; |
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1149 /* One Minute announcements for first five */ |
|
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1150 hinfo->hi_nextannouce = 1; |
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1151 hinfo->hi_interval = 1; |
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1152 hinfo->hi_reps = 5; |
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1153 hinfo->hi_updatecnt = 0; |
|
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1154 hinfo->hi_type = type; |
| 5331 | 1155 |
|
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1156 /* This is the name used for HostAnnouncement */ |
|
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1157 (void) strlcpy(hinfo->hi_nbname, hinfo->hi_nic.nic_host, |
|
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|
1158 NETBIOS_NAME_SZ); |
|
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1159 (void) utf8_strupr(hinfo->hi_nbname); |
|
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1160 /* 0x20: file server service */ |
|
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1161 smb_init_name_struct((unsigned char *)hinfo->hi_nbname, |
|
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1162 NBT_SERVER, 0, hinfo->hi_nic.nic_ip.a_ipv4, |
|
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1163 htons(IPPORT_NETBIOS_DGM), |
|
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1164 NAME_ATTR_UNIQUE, NAME_ATTR_LOCAL, |
|
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|
1165 &hinfo->hi_netname); |
| 5331 | 1166 |
|
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1167 list_insert_tail(&smb_binfo.bi_hlist, hinfo); |
|
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1168 smb_binfo.bi_hcnt++; |
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1169 } while (smb_nic_getnext(&ni) == 0); |
|
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1170 |
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|
1171 (void) rw_unlock(&smb_binfo.bi_hlist_rwl); |
|
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|
1172 return (0); |
| 5331 | 1173 } |
| 1174 | |
| 1175 /* | |
| 1176 * smb_browser_non_master_duties | |
| 1177 * | |
| 1178 * To advertise its presence, i.e. to publish itself as being available, a | |
| 1179 * non-browser server sends a HostAnnouncement browser frame. If the server | |
| 1180 * is a member of domain "D", this frame is sent to the NETBIOS unique name | |
| 1181 * D(1d) and mailslot "\\MAILSLOT\\BROWSE". | |
| 1182 */ | |
|
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|
1183 static void |
|
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1184 smb_browser_non_master_duties(smb_hostinfo_t *hinfo, boolean_t remove) |
| 5331 | 1185 { |
| 1186 struct name_entry name; | |
| 1187 struct name_entry *dest; | |
|
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1188 addr_entry_t addr; |
| 5331 | 1189 char resource_domain[SMB_PI_MAX_DOMAIN]; |
| 1190 | |
|
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1191 smb_browser_send_HostAnnouncement(hinfo, hinfo->hi_interval, |
|
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1192 remove, 0, NBT_MB); |
|
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1193 if (smb_getdomainname(resource_domain, SMB_PI_MAX_DOMAIN) != 0) |
|
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1194 return; |
| 5331 | 1195 |
| 1196 (void) utf8_strupr(resource_domain); | |
| 1197 | |
|
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1198 smb_init_name_struct((unsigned char *)resource_domain, NBT_MB, |
| 5331 | 1199 0, 0, 0, 0, 0, &name); |
| 1200 | |
| 1201 if ((dest = smb_name_find_name(&name))) { | |
| 1202 addr = dest->addr_list; | |
| 1203 addr.forw = addr.back = &addr; | |
| 1204 smb_name_unlock_name(dest); | |
|
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1205 smb_browser_send_HostAnnouncement(hinfo, hinfo->hi_interval, |
|
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1206 remove, &addr, NBT_MB); |
| 5331 | 1207 } else { |
|
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1208 smb_init_name_struct((unsigned char *)resource_domain, |
|
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1209 NBT_DMB, 0, 0, 0, 0, 0, &name); |
| 5331 | 1210 if ((dest = smb_name_find_name(&name))) { |
| 1211 addr = dest->addr_list; | |
| 1212 addr.forw = addr.back = &addr; | |
| 1213 smb_name_unlock_name(dest); | |
|
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|
1214 smb_browser_send_HostAnnouncement(hinfo, |
|
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1215 remove, hinfo->hi_interval, &addr, NBT_DMB); |
| 5331 | 1216 } |
| 1217 } | |
| 1218 | |
| 1219 /* | |
| 1220 * One Minute announcements for first five | |
|
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1221 * minutes, one minute longer each round |
| 5331 | 1222 * until 12 minutes and every 12 minutes |
| 1223 * thereafter. | |
| 1224 */ | |
|
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1225 if (--hinfo->hi_reps == 0) { |
|
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|
1226 if (hinfo->hi_interval < 12) |
|
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|
1227 hinfo->hi_interval++; |
| 5331 | 1228 |
|
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1229 hinfo->hi_reps = 1; |
| 5331 | 1230 } |
| 1231 | |
|
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1232 hinfo->hi_nextannouce = hinfo->hi_interval; |
| 5331 | 1233 } |
| 1234 | |
| 1235 | |
| 1236 /* | |
|
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1237 * SMB NetBIOS Browser Service |
| 5331 | 1238 */ |
| 1239 /*ARGSUSED*/ | |
| 1240 void * | |
|
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1241 smb_browser_service(void *arg) |
| 5331 | 1242 { |
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1243 smb_hostinfo_t *hinfo; |
| 5331 | 1244 |
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1245 smb_browser_infoinit(); |
| 5331 | 1246 smb_browser_config(); |
| 1247 | |
|
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1248 smb_netbios_event(NETBIOS_EVENT_BROWSER_START); |
| 5331 | 1249 |
|
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1250 restart: |
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|
1251 do { |
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1252 (void) rw_rdlock(&smb_binfo.bi_hlist_rwl); |
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1253 hinfo = list_head(&smb_binfo.bi_hlist); |
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1254 |
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1255 while (hinfo) { |
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1256 if (--hinfo->hi_nextannouce > 0 || |
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1257 hinfo->hi_nic.nic_bcast == 0) { |
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1258 hinfo = list_next(&smb_binfo.bi_hlist, hinfo); |
| 5331 | 1259 continue; |
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1260 } |
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1261 |
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|
1262 smb_browser_non_master_duties(hinfo, B_FALSE); |
| 5331 | 1263 |
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1264 /* Check to see whether reconfig is needed */ |
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1265 (void) mutex_lock(&smb_binfo.bi_mtx); |
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1266 if (smb_binfo.bi_changed) { |
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|
1267 smb_binfo.bi_changed = B_FALSE; |
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1268 (void) mutex_unlock(&smb_binfo.bi_mtx); |
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1269 (void) rw_unlock(&smb_binfo.bi_hlist_rwl); |
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|
1270 smb_browser_config(); |
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|
1271 goto restart; |
|
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|
1272 } |
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|
1273 (void) mutex_unlock(&smb_binfo.bi_mtx); |
| 5331 | 1274 |
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1275 hinfo = list_next(&smb_binfo.bi_hlist, hinfo); |
| 5331 | 1276 } |
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1277 |
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1278 (void) rw_unlock(&smb_binfo.bi_hlist_rwl); |
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1279 smb_netbios_sleep(SECSPERMIN); /* 1 minute */ |
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1280 } while (smb_netbios_running()); |
| 5331 | 1281 |
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|
1282 smb_browser_infoterm(); |
|
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1283 smb_netbios_event(NETBIOS_EVENT_BROWSER_STOP); |
| 5331 | 1284 return (0); |
| 1285 } | |
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|
1286 |
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|
1287 /* |
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|
1288 * smb_browser_netlogon |
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|
1289 * |
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|
1290 * Sends SAMLOGON/NETLOGON request for all host/ips, except |
|
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|
1291 * aliases, to find a domain controller. |
|
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1292 * |
|
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1293 * The dc argument will be set if a DC is found. |
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1294 */ |
|
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|
1295 boolean_t |
|
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1296 smb_browser_netlogon(char *domain, char *dc, uint32_t dc_len) |
|
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1297 { |
|
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|
1298 smb_hostinfo_t *hinfo; |
|
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1299 boolean_t found = B_FALSE; |
|
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1300 timestruc_t to; |
|
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1301 int err; |
|
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1302 |
|
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|
1303 (void) rw_rdlock(&smb_binfo.bi_hlist_rwl); |
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|
1304 hinfo = list_head(&smb_binfo.bi_hlist); |
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|
1305 while (hinfo) { |
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|
1306 if ((hinfo->hi_nic.nic_smbflags & SMB_NICF_ALIAS) == 0) |
|
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|
1307 smb_netlogon_request(&hinfo->hi_netname, domain); |
|
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1308 hinfo = list_next(&smb_binfo.bi_hlist, hinfo); |
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|
1309 } |
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|
1310 (void) rw_unlock(&smb_binfo.bi_hlist_rwl); |
|
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1311 |
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1312 bzero(dc, dc_len); |
|
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1313 to.tv_sec = 30; |
|
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1314 to.tv_nsec = 0; |
|
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1315 (void) mutex_lock(&ntdomain_mtx); |
|
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1316 while (ntdomain_info.n_ipaddr == 0) { |
|
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1317 err = cond_reltimedwait(&ntdomain_cv, &ntdomain_mtx, &to); |
|
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1318 if (err == ETIME) |
|
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|
1319 break; |
|
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1320 } |
|
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1321 |
|
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1322 if (ntdomain_info.n_ipaddr != 0) { |
|
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1323 (void) strlcpy(dc, ntdomain_info.n_name, dc_len); |
|
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1324 found = B_TRUE; |
|
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1325 } |
|
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|
1326 (void) mutex_unlock(&ntdomain_mtx); |
|
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1327 |
|
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|
1328 return (found); |
|
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|
1329 } |
|
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|
1330 |
|
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|
1331 /* |
|
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|
1332 * smb_browser_infoinit |
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|
1333 * |
|
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1334 * This function is called only once when the browser starts |
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1335 * to initialize the global smb_binfo structure. |
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|
1336 */ |
|
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|
1337 static void |
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|
1338 smb_browser_infoinit(void) |
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1339 { |
|
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|
1340 (void) mutex_lock(&ntdomain_mtx); |
|
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|
1341 bzero(&ntdomain_info, sizeof (ntdomain_info)); |
|
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|
1342 (void) mutex_unlock(&ntdomain_mtx); |
|
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1343 |
|
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1344 (void) rw_wrlock(&smb_binfo.bi_hlist_rwl); |
|
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|
1345 list_create(&smb_binfo.bi_hlist, sizeof (smb_hostinfo_t), |
|
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|
1346 offsetof(smb_hostinfo_t, hi_lnd)); |
|
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|
1347 smb_binfo.bi_hcnt = 0; |
|
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|
1348 (void) rw_unlock(&smb_binfo.bi_hlist_rwl); |
|
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|
1349 |
|
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|
1350 (void) mutex_lock(&smb_binfo.bi_mtx); |
|
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|
1351 smb_binfo.bi_changed = B_FALSE; |
|
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|
1352 (void) mutex_unlock(&smb_binfo.bi_mtx); |
|
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|
1353 } |
|
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|
1354 |
|
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|
1355 /* |
|
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|
1356 * smb_browser_infoterm |
|
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|
1357 * |
|
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1358 * This function is called only once when the browser stops |
|
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|
1359 * to destroy the smb_binfo structure. |
|
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|
1360 */ |
|
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|
1361 static void |
|
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1362 smb_browser_infoterm(void) |
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1363 { |
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1364 (void) rw_wrlock(&smb_binfo.bi_hlist_rwl); |
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1365 smb_browser_infofree(); |
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1366 list_destroy(&smb_binfo.bi_hlist); |
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1367 (void) rw_unlock(&smb_binfo.bi_hlist_rwl); |
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1368 } |
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1369 |
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1370 /* |
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1371 * smb_browser_infofree |
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1372 * |
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1373 * Removes all the hostinfo structures from the browser list |
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1374 * and frees the allocated memory |
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1375 */ |
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1376 static void |
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1377 smb_browser_infofree(void) |
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1378 { |
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1379 smb_hostinfo_t *hinfo; |
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1380 |
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1381 while ((hinfo = list_head(&smb_binfo.bi_hlist)) != NULL) { |
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1382 list_remove(&smb_binfo.bi_hlist, hinfo); |
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1383 free(hinfo); |
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1384 } |
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1385 |
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1386 smb_binfo.bi_hcnt = 0; |
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1387 } |