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|
/*
Unix SMB/CIFS implementation.
NBT netbios routines and daemon - version 2
Copyright (C) Andrew Tridgell 1994-1998
Copyright (C) Luke Kenneth Casson Leighton 1994-1998
Copyright (C) Jeremy Allison 1994-1998
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "../librpc/gen_ndr/svcctl.h"
#include "nmbd/nmbd.h"
#include "lib/util/string_wrappers.h"
extern bool found_lm_clients;
#if 0
/* XXXX note: This function is currently unsuitable for use, as it
does not properly check that a server is in a fit state to become
a backup browser before asking it to be one.
The code is left here to be worked on at a later date.
*/
/****************************************************************************
Tell a server to become a backup browser
**************************************************************************/
void tell_become_backup(void)
{
struct subnet_record *subrec;
for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec))
{
struct work_record *work;
for (work = subrec->workgrouplist; work; work = work->next)
{
struct server_record *servrec;
int num_servers = 0;
int num_backups = 0;
for (servrec = work->serverlist; servrec; servrec = servrec->next)
{
num_servers++;
if (is_myname(servrec->serv.name))
continue;
if (servrec->serv.type & SV_TYPE_BACKUP_BROWSER)
{
num_backups++;
continue;
}
if (servrec->serv.type & SV_TYPE_MASTER_BROWSER)
continue;
if (!(servrec->serv.type & SV_TYPE_POTENTIAL_BROWSER))
continue;
DEBUG(3,("num servers: %d num backups: %d\n",
num_servers, num_backups));
/* make first server a backup server. thereafter make every
tenth server a backup server */
if (num_backups != 0 && (num_servers+9) / num_backups > 10)
continue;
DEBUG(2,("sending become backup to %s %s for %s\n",
servrec->serv.name, inet_ntoa(subrec->bcast_ip),
work->work_group));
/* type 11 request from MYNAME(20) to WG(1e) for SERVER */
do_announce_request(servrec->serv.name, work->work_group,
ANN_BecomeBackup, 0x20, 0x1e, subrec->bcast_ip);
}
}
}
}
#endif
/*******************************************************************
Process an incoming host announcement packet.
*******************************************************************/
void process_host_announce(struct subnet_record *subrec, struct packet_struct *p, const char *buf)
{
struct dgram_packet *dgram = &p->packet.dgram;
int ttl = IVAL(buf,1)/1000;
unstring announce_name;
uint32_t servertype = IVAL(buf,23);
fstring comment;
struct work_record *work;
struct server_record *servrec;
unstring work_name;
unstring source_name;
ZERO_STRUCT(source_name);
ZERO_STRUCT(announce_name);
pull_ascii_fstring(comment, buf+31);
pull_ascii_nstring(announce_name, sizeof(announce_name), buf+5);
pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name);
DEBUG(3,("process_host_announce: from %s<%02x> IP %s to \
%s for server %s.\n", source_name, source_name[15], inet_ntoa(p->ip),
nmb_namestr(&dgram->dest_name),announce_name));
DEBUG(5,("process_host_announce: ttl=%d server type=%08x comment=%s\n",
ttl, servertype,comment));
/* Filter servertype to remove impossible bits. */
servertype &= ~(SV_TYPE_LOCAL_LIST_ONLY|SV_TYPE_DOMAIN_ENUM);
/* A host announcement must be sent to the name WORKGROUP<1d>. */
if(dgram->dest_name.name_type != 0x1d) {
DEBUG(2,("process_host_announce: incorrect name type for destination from IP %s \
(was %02x) should be 0x1d. Allowing packet anyway.\n",
inet_ntoa(p->ip), dgram->dest_name.name_type));
/* Change it so it was. */
dgram->dest_name.name_type = 0x1d;
}
/* For a host announce the workgroup name is the destination name. */
pull_ascii_nstring(work_name, sizeof(work_name), dgram->dest_name.name);
/*
* Syntax servers version 5.1 send HostAnnounce packets to
* *THE WRONG NAME*. They send to LOCAL_MASTER_BROWSER_NAME<00>
* instead of WORKGROUP<1d> name. So to fix this we check if
* the workgroup name is our own name, and if so change it
* to be our primary workgroup name.
*/
if(strequal(work_name, lp_netbios_name()))
unstrcpy(work_name,lp_workgroup());
/*
* We are being very agressive here in adding a workgroup
* name on the basis of a host announcing itself as being
* in that workgroup. Maybe we should wait for the workgroup
* announce instead ? JRA.
*/
work = find_workgroup_on_subnet(subrec, work_name);
if(servertype != 0) {
if (work ==NULL ) {
/* We have no record of this workgroup. Add it. */
if((work = create_workgroup_on_subnet(subrec, work_name, ttl))==NULL)
goto done;
}
if((servrec = find_server_in_workgroup( work, announce_name))==NULL) {
/* If this server is not already in the workgroup, add it. */
create_server_on_workgroup(work, announce_name,
servertype|SV_TYPE_LOCAL_LIST_ONLY,
ttl, comment);
} else {
/* Update the record. */
servrec->serv.type = servertype|SV_TYPE_LOCAL_LIST_ONLY;
update_server_ttl( servrec, ttl);
strlcpy(servrec->serv.comment,comment,sizeof(servrec->serv.comment));
}
} else {
/*
* This server is announcing it is going down. Remove it from the
* workgroup.
*/
if(!is_myname(announce_name) && (work != NULL) &&
((servrec = find_server_in_workgroup( work, announce_name))!=NULL)) {
remove_server_from_workgroup( work, servrec);
}
}
subrec->work_changed = True;
done:
return;
}
/*******************************************************************
Process an incoming WORKGROUP announcement packet.
*******************************************************************/
void process_workgroup_announce(struct subnet_record *subrec, struct packet_struct *p, const char *buf)
{
struct dgram_packet *dgram = &p->packet.dgram;
int ttl = IVAL(buf,1)/1000;
unstring workgroup_announce_name;
unstring master_name;
uint32_t servertype = IVAL(buf,23);
struct work_record *work;
unstring source_name;
unstring dest_name;
pull_ascii_nstring(workgroup_announce_name,sizeof(workgroup_announce_name),buf+5);
pull_ascii_nstring(master_name,sizeof(master_name),buf+31);
pull_ascii_nstring(source_name,sizeof(source_name),dgram->source_name.name);
pull_ascii_nstring(dest_name,sizeof(dest_name),dgram->dest_name.name);
DEBUG(3,("process_workgroup_announce: from %s<%02x> IP %s to \
%s for workgroup %s.\n", source_name, source_name[15], inet_ntoa(p->ip),
nmb_namestr(&dgram->dest_name),workgroup_announce_name));
DEBUG(5,("process_workgroup_announce: ttl=%d server type=%08x master browser=%s\n",
ttl, servertype, master_name));
/* Workgroup announcements must only go to the MSBROWSE name. */
if (!strequal(dest_name, MSBROWSE) || (dgram->dest_name.name_type != 0x1)) {
DEBUG(0,("process_workgroup_announce: from IP %s should be to __MSBROWSE__<0x01> not %s\n",
inet_ntoa(p->ip), nmb_namestr(&dgram->dest_name)));
goto done;
}
if ((work = find_workgroup_on_subnet(subrec, workgroup_announce_name))==NULL) {
/* We have no record of this workgroup. Add it. */
if((work = create_workgroup_on_subnet(subrec, workgroup_announce_name, ttl))==NULL)
goto done;
} else {
/* Update the workgroup death_time. */
update_workgroup_ttl(work, ttl);
}
if(*work->local_master_browser_name == '\0') {
/* Set the master browser name. */
set_workgroup_local_master_browser_name( work, master_name );
}
subrec->work_changed = True;
done:
return;
}
/*******************************************************************
Process an incoming local master browser announcement packet.
*******************************************************************/
void process_local_master_announce(struct subnet_record *subrec, struct packet_struct *p, const char *buf)
{
struct dgram_packet *dgram = &p->packet.dgram;
int ttl = IVAL(buf,1)/1000;
unstring server_name;
uint32_t servertype = IVAL(buf,23);
fstring comment;
unstring work_name;
struct work_record *work = NULL;
struct server_record *servrec;
unstring source_name;
pull_ascii_nstring(server_name,sizeof(server_name),buf+5);
pull_ascii_fstring(comment, buf+31);
pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name);
pull_ascii_nstring(work_name, sizeof(work_name), dgram->dest_name.name);
DEBUG(3,("process_local_master_announce: from %s<%02x> IP %s to \
%s for server %s.\n", source_name, source_name[15], inet_ntoa(p->ip),
nmb_namestr(&dgram->dest_name),server_name));
DEBUG(5,("process_local_master_announce: ttl=%d server type=%08x comment=%s\n",
ttl, servertype, comment));
/* A local master announcement must be sent to the name WORKGROUP<1e>. */
if(dgram->dest_name.name_type != 0x1e) {
DEBUG(0,("process_local_master_announce: incorrect name type for destination from IP %s \
(was %02x) should be 0x1e. Ignoring packet.\n",
inet_ntoa(p->ip), dgram->dest_name.name_type));
goto done;
}
/* Filter servertype to remove impossible bits. */
servertype &= ~(SV_TYPE_LOCAL_LIST_ONLY|SV_TYPE_DOMAIN_ENUM);
/* For a local master announce the workgroup name is the destination name. */
if ((work = find_workgroup_on_subnet(subrec, work_name))==NULL) {
/* Don't bother adding if it's a local master release announce. */
if(servertype == 0)
goto done;
/* We have no record of this workgroup. Add it. */
if((work = create_workgroup_on_subnet(subrec, work_name, ttl))==NULL)
goto done;
}
/* If we think we're the local master browser for this workgroup,
we should never have got this packet. We don't see our own
packets.
*/
if(AM_LOCAL_MASTER_BROWSER(work)) {
DEBUG(0,("process_local_master_announce: Server %s at IP %s is announcing itself as \
a local master browser for workgroup %s and we think we are master. Forcing election.\n",
server_name, inet_ntoa(p->ip), work_name));
/* Samba nmbd versions 1.9.17 to 1.9.17p4 have a bug in that when
they have become a local master browser once, they will never
stop sending local master announcements. To fix this we send
them a reset browser packet, with level 0x2 on the __SAMBA__
name that only they should be listening to. */
send_browser_reset( 0x2, "__SAMBA__" , 0x20, p->ip);
/* We should demote ourself and force an election. */
unbecome_local_master_browser( subrec, work, True);
/* The actual election requests are handled in nmbd_election.c */
goto done;
}
/* Find the server record on this workgroup. If it doesn't exist, add it. */
if(servertype != 0) {
if((servrec = find_server_in_workgroup( work, server_name))==NULL) {
/* If this server is not already in the workgroup, add it. */
create_server_on_workgroup(work, server_name,
servertype|SV_TYPE_LOCAL_LIST_ONLY,
ttl, comment);
} else {
/* Update the record. */
if (servrec->serv.type !=
(servertype|SV_TYPE_LOCAL_LIST_ONLY)) {
servrec->serv.type =
servertype|SV_TYPE_LOCAL_LIST_ONLY;
subrec->work_changed = true;
}
if (!strequal(servrec->serv.comment,comment)) {
strlcpy(servrec->serv.comment,
comment,
sizeof(servrec->serv.comment));
subrec->work_changed = true;
}
update_server_ttl(servrec, ttl);
}
if (!strequal(work->local_master_browser_name, server_name)) {
set_workgroup_local_master_browser_name( work, server_name );
subrec->work_changed = true;
}
} else {
/*
* This server is announcing it is going down. Remove it from the
* workgroup.
*/
if(!is_myname(server_name) &&
((servrec = find_server_in_workgroup( work, server_name))!=NULL)) {
remove_server_from_workgroup( work, servrec);
}
}
done:
return;
}
/*******************************************************************
Process a domain master announcement frame.
Domain master browsers receive these from local masters. The Domain
master should then issue a sync with the local master, asking for
that machines local server list.
******************************************************************/
void process_master_browser_announce(struct subnet_record *subrec,
struct packet_struct *p,const char *buf)
{
unstring local_master_name;
struct work_record *work;
struct browse_cache_record *browrec;
pull_ascii_nstring(local_master_name,sizeof(local_master_name),buf);
DEBUG(3,("process_master_browser_announce: Local master announce from %s IP %s.\n",
local_master_name, inet_ntoa(p->ip)));
if (!lp_domain_master()) {
DEBUG(0,("process_master_browser_announce: Not configured as domain \
master - ignoring master announce.\n"));
goto done;
}
if((work = find_workgroup_on_subnet(subrec, lp_workgroup())) == NULL) {
DEBUG(0,("process_master_browser_announce: Cannot find workgroup %s on subnet %s\n",
lp_workgroup(), subrec->subnet_name));
goto done;
}
if(!AM_DOMAIN_MASTER_BROWSER(work)) {
DEBUG(0,("process_master_browser_announce: Local master announce made to us from \
%s IP %s and we are not a domain master browser.\n", local_master_name, inet_ntoa(p->ip)));
goto done;
}
/* Add this host as a local master browser entry on the browse lists.
This causes a sync request to be made to it at a later date.
*/
if((browrec = find_browser_in_lmb_cache( local_master_name )) == NULL) {
/* Add it. */
create_browser_in_lmb_cache( work->work_group, local_master_name, p->ip);
} else {
update_browser_death_time(browrec);
}
done:
return;
}
/*******************************************************************
Process an incoming LanMan host announcement packet.
*******************************************************************/
void process_lm_host_announce(struct subnet_record *subrec, struct packet_struct *p, const char *buf, int len)
{
struct dgram_packet *dgram = &p->packet.dgram;
uint32_t servertype = IVAL(buf,1);
int osmajor=CVAL(buf,5); /* major version of node software */
int osminor=CVAL(buf,6); /* minor version of node software */
int ttl = SVAL(buf,7);
unstring announce_name;
struct work_record *work;
struct server_record *servrec;
unstring work_name;
unstring source_name;
fstring comment;
char *s = get_safe_str_ptr(buf,len,discard_const_p(char, buf),9);
if (!s) {
goto done;
}
s = skip_string(buf,len,s);
if (!s) {
goto done;
}
pull_ascii(comment, s, sizeof(fstring), 43, STR_TERMINATE);
pull_ascii_nstring(announce_name,sizeof(announce_name),buf+9);
pull_ascii_nstring(source_name,sizeof(source_name),dgram->source_name.name);
/* For a LanMan host announce the workgroup name is the destination name. */
pull_ascii_nstring(work_name,sizeof(work_name),dgram->dest_name.name);
DEBUG(3,("process_lm_host_announce: LM Announcement from %s IP %s to \
%s for server %s.\n", nmb_namestr(&dgram->source_name), inet_ntoa(p->ip),
nmb_namestr(&dgram->dest_name),announce_name));
DEBUG(5,("process_lm_host_announce: os=(%d,%d) ttl=%d server type=%08x comment=%s\n",
osmajor, osminor, ttl, servertype,comment));
if ((osmajor < 36) || (osmajor > 38) || (osminor !=0)) {
DEBUG(5,("process_lm_host_announce: LM Announcement packet does not \
originate from OS/2 Warp client. Ignoring packet.\n"));
/* Could have been from a Windows machine (with its LM Announce enabled),
or a Samba server. Then don't disrupt the current browse list. */
goto done;
}
/* Filter servertype to remove impossible bits. */
servertype &= ~(SV_TYPE_LOCAL_LIST_ONLY|SV_TYPE_DOMAIN_ENUM);
/* A LanMan host announcement must be sent to the name WORKGROUP<00>. */
if(dgram->dest_name.name_type != 0x00) {
DEBUG(2,("process_lm_host_announce: incorrect name type for destination from IP %s \
(was %02x) should be 0x00. Allowing packet anyway.\n",
inet_ntoa(p->ip), dgram->dest_name.name_type));
/* Change it so it was. */
dgram->dest_name.name_type = 0x00;
}
/*
* Syntax servers version 5.1 send HostAnnounce packets to
* *THE WRONG NAME*. They send to LOCAL_MASTER_BROWSER_NAME<00>
* instead of WORKGROUP<1d> name. So to fix this we check if
* the workgroup name is our own name, and if so change it
* to be our primary workgroup name. This code is probably
* not needed in the LanMan announce code, but it won't hurt.
*/
if(strequal(work_name, lp_netbios_name()))
unstrcpy(work_name,lp_workgroup());
/*
* We are being very agressive here in adding a workgroup
* name on the basis of a host announcing itself as being
* in that workgroup. Maybe we should wait for the workgroup
* announce instead ? JRA.
*/
work = find_workgroup_on_subnet(subrec, work_name);
if(servertype != 0) {
if (work == NULL) {
/* We have no record of this workgroup. Add it. */
if((work = create_workgroup_on_subnet(subrec, work_name, ttl))==NULL)
goto done;
}
if((servrec = find_server_in_workgroup( work, announce_name))==NULL) {
/* If this server is not already in the workgroup, add it. */
create_server_on_workgroup(work, announce_name,
servertype|SV_TYPE_LOCAL_LIST_ONLY,
ttl, comment);
} else {
/* Update the record. */
servrec->serv.type = servertype|SV_TYPE_LOCAL_LIST_ONLY;
update_server_ttl( servrec, ttl);
strlcpy(servrec->serv.comment,comment,sizeof(servrec->serv.comment));
}
} else {
/*
* This server is announcing it is going down. Remove it from the
* workgroup.
*/
if(!is_myname(announce_name) && (work != NULL) &&
((servrec = find_server_in_workgroup( work, announce_name))!=NULL)) {
remove_server_from_workgroup( work, servrec);
}
}
subrec->work_changed = True;
found_lm_clients = True;
done:
return;
}
/****************************************************************************
Send a backup list response.
*****************************************************************************/
static void send_backup_list_response(struct subnet_record *subrec,
struct work_record *work,
struct nmb_name *send_to_name,
unsigned char max_number_requested,
uint32_t token, struct in_addr sendto_ip,
int port)
{
char outbuf[1024];
char *p, *countptr;
unsigned int count = 0;
unstring send_to_namestr;
#if 0
struct server_record *servrec;
#endif
unstring myname;
memset(outbuf,'\0',sizeof(outbuf));
DEBUG(3,("send_backup_list_response: sending backup list for workgroup %s to %s IP %s\n",
work->work_group, nmb_namestr(send_to_name), inet_ntoa(sendto_ip)));
p = outbuf;
SCVAL(p,0,ANN_GetBackupListResp); /* Backup list response opcode. */
p++;
countptr = p;
p++;
SIVAL(p,0,token); /* The sender's unique info. */
p += 4;
/* We always return at least one name - our own. */
count = 1;
unstrcpy(myname, lp_netbios_name());
if (!strupper_m(myname)) {
DEBUG(4,("strupper_m %s failed\n", myname));
return;
}
myname[15]='\0';
push_ascii(p, myname, sizeof(outbuf)-PTR_DIFF(p,outbuf)-1, STR_TERMINATE);
p = skip_string(outbuf,sizeof(outbuf),p);
/* Look for backup browsers in this workgroup. */
#if 0
/* we don't currently send become_backup requests so we should never
send any other servers names out as backups for our
workgroup. That's why this is commented out (tridge) */
/*
* NB. Note that the struct work_record here is not neccessarily
* attached to the subnet *subrec.
*/
for (servrec = work->serverlist; servrec; servrec = servrec->next)
{
int len = PTR_DIFF(p, outbuf);
if((sizeof(outbuf) - len) < 16)
break;
if(count >= (unsigned int)max_number_requested)
break;
if(strnequal(servrec->serv.name, lp_netbios_name(),15))
continue;
if(!(servrec->serv.type & SV_TYPE_BACKUP_BROWSER))
continue;
strlcpy(p, servrec->serv.name, 16);
strupper_m(p);
count++;
DEBUG(5,("send_backup_list_response: Adding server %s number %d\n",
p, count));
p = skip_string(outbuf,sizeof(outbuf),p);
}
#endif
SCVAL(countptr, 0, count);
pull_ascii_nstring(send_to_namestr, sizeof(send_to_namestr), send_to_name->name);
DEBUG(4,("send_backup_list_response: sending response to %s<00> IP %s with %d servers.\n",
send_to_namestr, inet_ntoa(sendto_ip), count));
send_mailslot(True, BROWSE_MAILSLOT,
outbuf,PTR_DIFF(p,outbuf),
lp_netbios_name(), 0,
send_to_namestr,0,
sendto_ip, subrec->myip, port);
}
/*******************************************************************
Process a send backup list request packet.
A client sends a backup list request to ask for a list of servers on
the net that maintain server lists for a domain. A server is then
chosen from this list to send NetServerEnum commands to to list
available servers.
********************************************************************/
void process_get_backup_list_request(struct subnet_record *subrec,
struct packet_struct *p,const char *buf)
{
struct dgram_packet *dgram = &p->packet.dgram;
struct work_record *work;
unsigned char max_number_requested = CVAL(buf,0);
uint32_t token = IVAL(buf,1); /* Sender's key index for the workgroup. */
int name_type = dgram->dest_name.name_type;
unstring workgroup_name;
struct subnet_record *search_subrec = subrec;
pull_ascii_nstring(workgroup_name, sizeof(workgroup_name), dgram->dest_name.name);
DEBUG(3,("process_get_backup_list_request: request from %s IP %s to %s.\n",
nmb_namestr(&dgram->source_name), inet_ntoa(p->ip),
nmb_namestr(&dgram->dest_name)));
/* We have to be a master browser, or a domain master browser
for the requested workgroup. That means it must be our
workgroup. */
if(strequal(workgroup_name, lp_workgroup()) == False) {
DEBUG(7,("process_get_backup_list_request: Ignoring announce request for workgroup %s.\n",
workgroup_name));
goto done;
}
if((work = find_workgroup_on_subnet(search_subrec, workgroup_name)) == NULL) {
DEBUG(0,("process_get_backup_list_request: Cannot find workgroup %s on \
subnet %s.\n", workgroup_name, search_subrec->subnet_name));
goto done;
}
/*
* If the packet was sent to WORKGROUP<1b> instead
* of WORKGROUP<1d> then it was unicast to us a domain master
* browser. Change search subrec to unicast.
*/
if(name_type == 0x1b) {
/* We must be a domain master browser in order to
process this packet. */
if(!AM_DOMAIN_MASTER_BROWSER(work)) {
DEBUG(0,("process_get_backup_list_request: domain list requested for workgroup %s \
and I am not a domain master browser.\n", workgroup_name));
goto done;
}
search_subrec = unicast_subnet;
} else if (name_type == 0x1d) {
/* We must be a local master browser in order to process this packet. */
if(!AM_LOCAL_MASTER_BROWSER(work)) {
DEBUG(0,("process_get_backup_list_request: domain list requested for workgroup %s \
and I am not a local master browser.\n", workgroup_name));
goto done;
}
} else {
DEBUG(0,("process_get_backup_list_request: Invalid name type %x - should be 0x1b or 0x1d.\n",
name_type));
goto done;
}
send_backup_list_response(subrec, work, &dgram->source_name,
max_number_requested, token, p->ip, p->port);
done:
return;
}
/*******************************************************************
Process a reset browser state packet.
Diagnostic packet:
0x1 - Stop being a master browser and become a backup browser.
0x2 - Discard browse lists, stop being a master browser, try again.
0x4 - Stop being a master browser forever.
******************************************************************/
void process_reset_browser(struct subnet_record *subrec,
struct packet_struct *p,const char *buf)
{
struct dgram_packet *dgram = &p->packet.dgram;
int state = CVAL(buf,0);
struct subnet_record *sr;
DEBUG(1,("process_reset_browser: received diagnostic browser reset \
request from %s IP %s state=0x%X\n",
nmb_namestr(&dgram->source_name), inet_ntoa(p->ip), state));
/* Stop being a local master browser on all our broadcast subnets. */
if (state & 0x1) {
for (sr = FIRST_SUBNET; sr; sr = NEXT_SUBNET_EXCLUDING_UNICAST(sr)) {
struct work_record *work;
for (work = sr->workgrouplist; work; work = work->next) {
if (AM_LOCAL_MASTER_BROWSER(work))
unbecome_local_master_browser(sr, work, True);
}
}
}
/* Discard our browse lists. */
if (state & 0x2) {
/*
* Calling expire_workgroups_and_servers with a -1
* time causes all servers not marked with a PERMANENT_TTL
* on the workgroup lists to be discarded, and all
* workgroups with empty server lists to be discarded.
* This means we keep our own server names and workgroup
* as these have a PERMANENT_TTL.
*/
expire_workgroups_and_servers(-1);
}
/* Request to stop browsing altogether. */
if (state & 0x4)
DEBUG(1,("process_reset_browser: ignoring request to stop being a browser.\n"));
}
/*******************************************************************
Process an announcement request packet.
We don't respond immediately, we just check it's a request for
our workgroup and then set the flag telling the announce code
in nmbd_sendannounce.c:announce_my_server_names that an
announcement is needed soon.
******************************************************************/
void process_announce_request(struct subnet_record *subrec, struct packet_struct *p, const char *buf)
{
struct dgram_packet *dgram = &p->packet.dgram;
struct work_record *work;
unstring workgroup_name;
pull_ascii_nstring(workgroup_name, sizeof(workgroup_name), dgram->dest_name.name);
DEBUG(3,("process_announce_request: Announce request from %s IP %s to %s.\n",
nmb_namestr(&dgram->source_name), inet_ntoa(p->ip),
nmb_namestr(&dgram->dest_name)));
/* We only send announcement requests on our workgroup. */
if(strequal(workgroup_name, lp_workgroup()) == False) {
DEBUG(7,("process_announce_request: Ignoring announce request for workgroup %s.\n",
workgroup_name));
goto done;
}
if((work = find_workgroup_on_subnet(subrec, workgroup_name)) == NULL) {
DEBUG(0,("process_announce_request: Unable to find workgroup %s on subnet !\n",
workgroup_name));
goto done;
}
work->needannounce = True;
done:
return;
}
/*******************************************************************
Process a LanMan announcement request packet.
We don't respond immediately, we just check it's a request for
our workgroup and then set the flag telling that we have found
a LanMan client (DOS or OS/2) and that we will have to start
sending LanMan announcements (unless specifically disabled
through the "lm announce" parameter in smb.conf)
******************************************************************/
void process_lm_announce_request(struct subnet_record *subrec, struct packet_struct *p, const char *buf, int len)
{
struct dgram_packet *dgram = &p->packet.dgram;
unstring workgroup_name;
pull_ascii_nstring(workgroup_name, sizeof(workgroup_name), dgram->dest_name.name);
DEBUG(3,("process_lm_announce_request: Announce request from %s IP %s to %s.\n",
nmb_namestr(&dgram->source_name), inet_ntoa(p->ip),
nmb_namestr(&dgram->dest_name)));
/* We only send announcement requests on our workgroup. */
if(strequal(workgroup_name, lp_workgroup()) == False) {
DEBUG(7,("process_lm_announce_request: Ignoring announce request for workgroup %s.\n",
workgroup_name));
goto done;
}
if(find_workgroup_on_subnet(subrec, workgroup_name) == NULL) {
DEBUG(0,("process_announce_request: Unable to find workgroup %s on subnet !\n",
workgroup_name));
goto done;
}
found_lm_clients = True;
done:
return;
}
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