Unix SMB/Netbios implementation.
Version 1.9.
NBT netbios routines and daemon - version 2
- Copyright (C) Andrew Tridgell 1994-1996
+ Copyright (C) Andrew Tridgell 1994-1997
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
extern pstring scope;
extern pstring myname;
+extern fstring myworkgroup;
extern struct in_addr ipzero;
-extern struct in_addr ipgrp;
+extern struct in_addr wins_ip;
extern struct subnet_record *subnetlist;
note: the name will _always_ be removed
XXXX at present, the name is removed _even_ if a WINS server says keep it.
+ If direct is True then the name being removed must have been a direct name
+ add. This is done for special names such as DOMAIN<1b>. Just delete it
+ without any network release traffic.
+
****************************************************************************/
-void remove_name_entry(struct subnet_record *d, int token, char *name,int type)
+void remove_name_entry(struct subnet_record *d, char *name,int type, BOOL direct)
{
/* XXXX BUG: if samba is offering WINS support, it should still broadcast
a de-registration packet to the local subnet before removing the
name from its local-subnet name database. */
+ int search = FIND_SELF;
struct name_record n;
struct name_record *n2=NULL;
make_nmb_name(&n.name,name,type,scope);
- if ((n2 = find_name_search(&d, &n.name, FIND_SELF, ipzero)))
+ if(d == wins_subnet)
+ search |= FIND_WINS;
+ else
+ search |= FIND_LOCAL;
+
+ if ((n2 = find_name_search(&d, &n.name, search, ipzero)))
{
/* check name isn't already being de-registered */
if (NAME_DEREG(n2->ip_flgs[0].nb_flags))
if (!n2) return;
+ /* Only remove names with non-zero death times. */
+ if(n2->death_time == 0)
+ {
+ DEBUG(5,("remove_name_entry: Name %s(%d) has zero ttl - not removing.\n",
+ name, type));
+ return;
+ }
+
/* remove the name immediately. even if the spec says we should
first try to release them, this is too dangerous with our current
name structures as otherwise we will end up replying to names we
don't really own */
remove_netbios_name(d,name,type,SELF,n2->ip_flgs[0].ip);
- if (ip_equal(d->bcast_ip, ipgrp))
+ if (ip_equal(d->bcast_ip, wins_ip))
{
- /* use WINS. this function can now be used to _either_
- do the release on samba's own database _or_ release
- the name with an arbitrary WINS server */
- queue_netbios_pkt_wins(d,ClientNMB,NMB_REL,NAME_RELEASE,
- token, name, type, 0, 0,0,NULL,NULL,
+ if (!lp_wins_support() && !direct)
+ {
+ /* not a WINS server: we have to release them on the network */
+ queue_netbios_pkt_wins(ClientNMB,NMB_REL,NAME_RELEASE,
+ name, type, 0, 0,0,NULL,NULL,
False, True, ipzero, ipzero);
- } else {
- /* local interface: release them on the network */
- queue_netbios_packet(d,ClientNMB,NMB_REL,NAME_RELEASE,
- token, name, type, 0, 0,0,NULL,NULL,
- True, True, d->bcast_ip, d->bcast_ip);
+ }
+ }
+ else
+ {
+ if(!direct)
+ /* local interface: release them on the network */
+ queue_netbios_packet(d,ClientNMB,NMB_REL,NAME_RELEASE,
+ name, type, 0, 0,0,NULL,NULL,
+ True, False, d->bcast_ip, d->bcast_ip);
}
}
/****************************************************************************
add an entry to the name list
-
+ If the direct BOOL is set then no network traffic is done for the add - it
+ is just blasted into the subnet entry with a zero TTL - it will not
+ expire and has not been legitimately claimed. This is *only* done if
+ we are a WINS server or for a special name such as DOMAIN<1b>.
+
big note: our name will _always_ be added (if there are no objections).
it's just a matter of when this will be done (e.g after a time-out).
****************************************************************************/
-void add_my_name_entry(struct subnet_record *d, int token,
- char *name,int type,int nb_flags)
+void add_my_name_entry(struct subnet_record *d,char *name,int type,int nb_flags, BOOL direct)
{
BOOL re_reg = False;
struct nmb_name n;
make_nmb_name(&n, name, type, scope);
if (find_name(d->namelist, &n, SELF))
- re_reg = True;
+ re_reg = True;
/* XXXX BUG: if samba is offering WINS support, it should still add the
name entry to a local-subnet name database. see rfc1001.txt 15.1.1 p28
regarding the point about M-nodes. */
- if (ip_equal(d->bcast_ip, ipgrp))
+ if (ip_equal(d->bcast_ip, wins_ip))
{
-#if 0
- if (lp_wins_support())
+ if (lp_wins_support() || direct)
{
/* we are a WINS server. */
- /* XXXX assume that if we are a WINS server that we are therefore
- not pointing to another WINS server as well. this may later NOT
- actually be true
- */
-
- struct nmb_ip data;
-
- data.nb_flags = nb_flags;
- putip(&data.ip, ipzero);
-
- DEBUG(4,("samba as WINS server adding: "));
+ if(lp_wins_support())
+ DEBUG(4,("add_my_name_entry: samba as WINS server adding: "));
+ else
+ DEBUG(4,("add_my_name_entry: direct name entry : adding: "));
+
/* this will call add_netbios_entry() */
-
- name_register_work(d, token, name, type, &data, GET_TTL(0),ipzero,False);
+ name_register_work(d, name, type, nb_flags,0, ipzero, False);
}
else
{
-#endif
- /* ipzero when not using an arbitrary wins server results in the
- netbios packet being short-circuited to process_nmb()
- */
+ DEBUG(4,("add_my_name_entry registering name %s with WINS server.\n",
+ name));
+
/* a time-to-live allows us to refresh this name with the WINS server. */
- queue_netbios_pkt_wins(d,ClientNMB,
- re_reg ? NMB_REG_REFRESH : NMB_REG, NAME_REGISTER,
- token, name, type, nb_flags, GET_TTL(0),0,NULL,NULL,
- False, True, ipzero, ipzero);
-#if 0
+ queue_netbios_pkt_wins(ClientNMB,
+ re_reg ? NMB_REG_REFRESH : NMB_REG, NAME_REGISTER,
+ name, type, nb_flags, GET_TTL(0),0,NULL,NULL,
+ False, True, ipzero, ipzero);
}
-#endif
}
else
{
- /* broadcast the packet, but it comes from ipzero */
- queue_netbios_packet(d,ClientNMB,
- re_reg ? NMB_REG_REFRESH : NMB_REG, NAME_REGISTER,
- token, name, type, nb_flags, GET_TTL(0),0,NULL,NULL,
- True, True, d->bcast_ip, ipzero);
+ if(direct)
+ {
+ /* Just enter the name to be the ip address of the subnet
+ via name_register_work to ensure all side effects are done.
+ */
+ DEBUG(4,("add_my_name_entry: direct name entry : adding: "));
+ /* this will call add_netbios_entry() */
+ name_register_work(d, name, type, nb_flags,0, d->myip, False);
+ }
+ else
+ {
+ /* broadcast the packet, but it comes from ipzero */
+ queue_netbios_packet(d,ClientNMB,
+ re_reg ? NMB_REG_REFRESH : NMB_REG, NAME_REGISTER,
+ name, type, nb_flags, GET_TTL(0),0,NULL,NULL,
+ True, False, d->bcast_ip, ipzero);
+ }
}
}
/****************************************************************************
- add the magic samba names, useful for finding samba servers
+ add the domain logon server and domain master browser names
+
+ this code was written so that several samba servers can co-operate in
+ sharing the task of (one server) being a domain master, and of being
+ domain logon servers.
+
**************************************************************************/
-void add_my_names(void)
+void add_domain_names(time_t t)
{
+ static time_t lastrun = 0;
struct subnet_record *d;
- int token;
+ struct work_record *work;
+ struct nmb_name n;
- /* each subnet entry, including WINS pseudo-subnet, has SELF names */
+ if (lastrun != 0 && t < lastrun + CHECK_TIME_ADD_DOM_NAMES * 60) return;
+ lastrun = t;
- /* XXXX if there was a transport layer added to samba (ipx/spx etc) then
- there would be yet _another_ for-loop, this time on the transport type
- */
-
- for (d = subnetlist; d; d = d->next)
+ for (d = FIRST_SUBNET; d; d = NEXT_SUBNET_INCLUDING_WINS(d))
{
- BOOL wins = lp_wins_support() && ip_equal(d->bcast_ip,ipgrp);
-
- for (token = 0; token < get_num_workgroups(); token++)
+ work = find_workgroupstruct(d, myworkgroup, False);
+ if (lp_domain_logons() && work && work->log_state == LOGON_NONE)
{
- char *my_name = conf_browsing_alias(token);
- if (my_name)
+ make_nmb_name(&n,myworkgroup,0x1c,scope);
+ if (!find_name(d->namelist, &n, FIND_SELF))
{
- add_my_name_entry(d, token, my_name,0x20,nb_type|NB_ACTIVE);
- add_my_name_entry(d, token, my_name,0x03,nb_type|NB_ACTIVE);
- add_my_name_entry(d, token, my_name,0x00,nb_type|NB_ACTIVE);
- add_my_name_entry(d, token, my_name,0x1f,nb_type|NB_ACTIVE);
+ /* logon servers are group names - we don't expect this to fail. */
+ DEBUG(0,("%s attempting to become logon server for %s %s\n",
+ timestring(), myworkgroup, inet_ntoa(d->bcast_ip)));
+ become_logon_server(d, work);
}
}
-
- /* these names are added permanently (ttl of zero) and will NOT be
- refreshed with the WINS server */
-
- add_netbios_entry(d,"*",0x0,nb_type|NB_ACTIVE,0,SELF,d->myip,False,wins);
- add_netbios_entry(d,"__SAMBA__",0x20,nb_type|NB_ACTIVE,0,SELF,d->myip,False,wins);
- add_netbios_entry(d,"__SAMBA__",0x00,nb_type|NB_ACTIVE,0,SELF,d->myip,False,wins);
-
- /* XXXX only be a logon server for the DEFAULT samba workgroup. for now. */
-
- if (lp_domain_logons())
- {
- /* XXXX the 0x1c is apparently something to do with domain logons */
- token = conf_workgroup_name_to_token(lp_workgroup(),myname);
- add_my_name_entry(d, token, lp_workgroup(),0x1c,nb_type|NB_ACTIVE|NB_GROUP);
- }
}
- /* check becoming a domain master under all browser aliases */
+ for (d = FIRST_SUBNET; d; d = NEXT_SUBNET_INCLUDING_WINS(d))
+ {
+ work = find_workgroupstruct(d, myworkgroup, True);
- if ((d = find_subnet(ipgrp)))
- {
- for (token = 0; token < get_num_workgroups(); token++)
- {
- if (conf_should_domain_master(token))
+ if (lp_domain_master() && work && work->dom_state == DOMAIN_NONE)
+ {
+ make_nmb_name(&n,myworkgroup,0x1b,scope);
+ if (!find_name(d->namelist, &n, FIND_SELF))
{
- char *work_name = conf_workgroup_name(token);
- if (work_name)
+ DEBUG(0,("%s add_domain_names: attempting to become domain master \
+browser on workgroup %s %s\n",
+ timestring(), myworkgroup, inet_ntoa(d->bcast_ip)));
+
+ if(d == wins_subnet)
{
- struct work_record *work = find_workgroupstruct(d,work_name,True);
- if (work && work->state == MST_NONE)
+ if (lp_wins_support())
+ {
+ /* use the wins server's capabilities (indirectly). if
+ someone has already registered the domain<1b> name with
+ the WINS server, then the WINS server's job is to _check_
+ that the owner still wants it, before giving it away.
+ */
+
+ DEBUG(1,("%s initiating becoming domain master for %s\n",
+ timestring(), myworkgroup));
+ become_domain_master(d, work);
+ }
+ else
{
- work->state = MST_DOMAIN_NONE;
- become_master(d, work);
+ /* send out a query to establish whether there's a
+ domain controller on the WINS subnet. if not,
+ we can become a domain controller.
+ it's only polite that we check, before claiming the
+ NetBIOS name 0x1b.
+ */
+
+ DEBUG(0,("add_domain_names:querying WINS for domain master \
+on workgroup %s\n", myworkgroup));
+
+ queue_netbios_pkt_wins(ClientNMB,NMB_QUERY,NAME_QUERY_DOMAIN,
+ myworkgroup, 0x1b,
+ 0, 0,0,NULL,NULL,
+ False, True, ipzero, ipzero);
}
}
+ else
+ {
+ DEBUG(0,("add_domain_names:querying subnet %s for domain master \
+on workgroup %s\n", inet_ntoa(d->bcast_ip), myworkgroup));
+ queue_netbios_packet(d,ClientNMB,NMB_QUERY,NAME_QUERY_DOMAIN,
+ myworkgroup, 0x1b,
+ 0, 0,0,NULL,NULL,
+ True, False,
+ d->bcast_ip, d->bcast_ip);
+ }
}
}
}
}
+/****************************************************************************
+ add the magic samba names, useful for finding samba servers
+ **************************************************************************/
+void add_my_names(void)
+{
+ struct subnet_record *d;
+ /* each subnet entry, including WINS pseudo-subnet, has SELF names */
+
+ /* XXXX if there was a transport layer added to samba (ipx/spx etc) then
+ there would be yet _another_ for-loop, this time on the transport type
+ */
+
+ for (d = FIRST_SUBNET; d; d = NEXT_SUBNET_INCLUDING_WINS(d))
+ {
+ BOOL wins = (lp_wins_support() && (d == wins_subnet));
+
+ add_my_name_entry(d, myname,0x20,nb_type|NB_ACTIVE,False);
+ add_my_name_entry(d, myname,0x03,nb_type|NB_ACTIVE,False);
+ add_my_name_entry(d, myname,0x00,nb_type|NB_ACTIVE,False);
+
+ /* these names are added permanently (ttl of zero) and will NOT be
+ refreshed with the WINS server */
+ add_netbios_entry(d,"*",0x0,nb_type|NB_ACTIVE,0,SELF,d->myip,False,wins);
+ add_netbios_entry(d,"*",0x20,nb_type|NB_ACTIVE,0,SELF,d->myip,False,wins);
+ add_netbios_entry(d,"__SAMBA__",0x20,nb_type|NB_ACTIVE,0,SELF,d->myip,False,wins);
+ add_netbios_entry(d,"__SAMBA__",0x00,nb_type|NB_ACTIVE,0,SELF,d->myip,False,wins);
+ }
+}
+
+
/****************************************************************************
remove all the samba names... from a WINS server if necessary.
**************************************************************************/
void remove_my_names()
{
- struct subnet_record *d;
+ struct subnet_record *d;
+
+ for (d = FIRST_SUBNET; d; d = NEXT_SUBNET_INCLUDING_WINS(d))
+ {
+ struct name_record *n, *next;
+
+ for (n = d->namelist; n; n = next)
+ {
+ next = n->next;
+ if (n->source == SELF)
+ {
+ /* get all SELF names removed from the WINS server's database */
+ /* XXXX note: problem occurs if this removes the wrong one! */
+
+ remove_name_entry(d,n->name.name, n->name.name_type,False);
+ }
+ }
+ }
+}
- for (d = subnetlist; d; d = d->next)
- {
- struct name_record *n, *next;
- for (n = d->namelist; n; n = next)
- {
- next = n->next;
- if (n->source == SELF)
- {
- /* get all SELF names removed from the WINS server's database */
- /* XXXX note: problem occurs if this removes the wrong one! */
-
- remove_name_entry(d, -1, n->name.name, n->name.name_type);
- }
- }
+/*******************************************************************
+ refresh my own names
+ ******************************************************************/
+void refresh_my_names(time_t t)
+{
+ struct subnet_record *d;
+
+ for (d = FIRST_SUBNET; d; d = NEXT_SUBNET_INCLUDING_WINS(d))
+ {
+ struct name_record *n;
+
+ for (n = d->namelist; n; n = n->next)
+ {
+ /* each SELF name has an individual time to be refreshed */
+ if (n->source == SELF && n->refresh_time < t &&
+ n->death_time != 0)
+ {
+ add_my_name_entry(d,n->name.name,n->name.name_type,
+ n->ip_flgs[0].nb_flags,False);
+ /* they get a new lease on life :-) */
+ n->death_time += GET_TTL(0);
+ n->refresh_time += GET_TTL(0);
+ }
}
+ }
}
XXXX which names to poll and which not can be refined at a later date.
******************************************************************/
-void query_refresh_names(void)
+void query_refresh_names(time_t t)
{
- struct name_record *n;
- struct subnet_record *d = find_subnet(ipgrp);
+ struct name_record *n;
+ struct subnet_record *d = wins_subnet;
- static time_t lasttime = 0;
- time_t t = time(NULL);
+ static time_t lasttime = 0;
- int count = 0;
- int name_refresh_time = NAME_POLL_REFRESH_TIME;
- int max_count = name_refresh_time * 2 / NAME_POLL_INTERVAL;
- if (max_count > 10) max_count = 10;
+ int count = 0;
+ int name_refresh_time = NAME_POLL_REFRESH_TIME;
+ int max_count = name_refresh_time * 2 / NAME_POLL_INTERVAL;
+ if (max_count > 10) max_count = 10;
- name_refresh_time = NAME_POLL_INTERVAL * max_count / 2;
+ name_refresh_time = NAME_POLL_INTERVAL * max_count / 2;
- /* if (!lp_poll_wins()) return; polling of registered names allowed */
+ /* if (!lp_poll_wins()) return; polling of registered names allowed */
- if (!d) return;
+ if (!d) return;
if (!lasttime) lasttime = t;
- if (t - lasttime < NAME_POLL_INTERVAL) return;
+ if (t - lasttime < NAME_POLL_INTERVAL) return;
lasttime = time(NULL);
- for (n = d->namelist; n; n = n->next)
- {
- /* only do unique, registered names. */
-
- if (n->source != REGISTER) continue;
- if (!NAME_GROUP(n->ip_flgs[0].nb_flags)) continue;
-
- if (n->refresh_time < t)
- {
- DEBUG(3,("Polling name %s\n", namestr(&n->name)));
-
- queue_netbios_packet(d,ClientNMB,NMB_QUERY,NAME_QUERY_CONFIRM,
- -1,n->name.name, n->name.name_type,
- 0,0,0,NULL,NULL,
- False,False,n->ip_flgs[0].ip,n->ip_flgs[0].ip);
- count++;
- }
-
- if (count >= max_count)
- {
- /* don't do too many of these at once, but do enough to
- cover everyone in the list */
- return;
- }
-
- /* this name will be checked on again, if it's not removed */
- n->refresh_time += name_refresh_time;
- }
+ for (n = d->namelist; n; n = n->next)
+ {
+ /* only do unique, registered names */
+
+ if (n->source != REGISTER) continue;
+ if (!NAME_GROUP(n->ip_flgs[0].nb_flags)) continue;
+
+ if (n->refresh_time < t)
+ {
+ DEBUG(3,("Polling name %s\n", namestr(&n->name)));
+
+ queue_netbios_packet(d,ClientNMB,NMB_QUERY,NAME_QUERY_CONFIRM,
+ n->name.name, n->name.name_type,
+ 0,0,0,NULL,NULL,
+ False,False,n->ip_flgs[0].ip,n->ip_flgs[0].ip);
+ count++;
+ }
+
+ if (count >= max_count)
+ {
+ /* don't do too many of these at once, but do enough to
+ cover everyone in the list */
+ return;
+ }
+
+ /* this name will be checked on again, if it's not removed */
+ n->refresh_time += name_refresh_time;
+ }
}
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