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The next phase in the WINS rewrite!

Browse Source 
We now cope wiith multiple WINS groups and multiple failover servers
for release and refresh as well as registration. We also do the regitrations
in the same fashion as W2K does, where we don't try to register the next
IP in the list for a name until the WINS server has acked the previos IP.
This prevents us flooding the WINS server and also seems to make for much
more reliable multi-homed registration.

I also changed the dead WINS server code to mark pairs of IPs dead,
not individual IPs. The idea is that a WINS server might be dead from
the point of view of one of our interfaces, but not another, so we
need to keep talking to it on one while moving onto a failover WINS
server on the other interface. This copes much better with partial
LAN outages and weird routing tables.
This commit is contained in:
Andrew Tridgell 0001-01-01 00:00:00 +00:00
parent 1e36b7e962
commit 313f2c9ff7
13 changed files with 817 additions and 844 deletions
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8
source/lib/interface.c
View File

@ -275,14 +275,6 @@ int iface_count(void)
return ret;
}
/****************************************************************************
True if we have two or more interfaces.
**************************************************************************/
BOOL we_are_multihomed(void)
{
return (iface_count() > 1 ? True : False);
}
/****************************************************************************
return the Nth interface
**************************************************************************/

104
source/lib/wins_srv.c
View File

@ -60,13 +60,19 @@
/* how long a server is marked dead for */
#define DEATH_TIME 600
/* a list of wins server that are marked dead. */
/* a list of wins server that are marked dead from the point of view
of a given source address. We keep a separate dead list for each src address
to cope with multiple interfaces that are not routable to each other
*/
static struct wins_dead {
struct in_addr ip;
struct in_addr dest_ip;
struct in_addr src_ip;
time_t revival; /* when it will be revived */
struct wins_dead *next, *prev;
} *dead_servers;
extern BOOL global_in_nmbd;
/* an internal convenience structure for an IP with a short string tag
attached */
@ -78,14 +84,17 @@ struct tagged_ip {
/*
see if an ip is on the dead list
*/
BOOL wins_srv_is_dead(struct in_addr ip)
BOOL wins_srv_is_dead(struct in_addr wins_ip, struct in_addr src_ip)
{
struct wins_dead *d;
for (d=dead_servers; d; d=d->next) {
if (ip_equal(ip, d->ip)) {
if (ip_equal(wins_ip, d->dest_ip) && ip_equal(src_ip, d->src_ip)) {
/* it might be due for revival */
if (d->revival <= time(NULL)) {
DEBUG(4,("Reviving wins server %s\n", inet_ntoa(ip)));
fstring src_name;
fstrcpy(src_name, inet_ntoa(src_ip));
DEBUG(4,("Reviving wins server %s for source %s\n",
inet_ntoa(wins_ip), src_name));
DLIST_REMOVE(dead_servers, d);
free(d);
return False;
@ -96,24 +105,49 @@ BOOL wins_srv_is_dead(struct in_addr ip)
return False;
}
/*
mark a wins server as being alive (for the moment)
*/
void wins_srv_alive(struct in_addr wins_ip, struct in_addr src_ip)
{
struct wins_dead *d;
for (d=dead_servers; d; d=d->next) {
if (ip_equal(wins_ip, d->dest_ip) && ip_equal(src_ip, d->src_ip)) {
fstring src_name;
fstrcpy(src_name, inet_ntoa(src_ip));
DEBUG(4,("Reviving wins server %s for source %s\n",
inet_ntoa(wins_ip), src_name));
DLIST_REMOVE(dead_servers, d);
return;
}
}
}
/*
mark a wins server as temporarily dead
*/
void wins_srv_died(struct in_addr ip)
void wins_srv_died(struct in_addr wins_ip, struct in_addr src_ip)
{
struct wins_dead *d;
fstring src_name;
if (is_zero_ip(ip) || wins_srv_is_dead(ip)) {
if (is_zero_ip(wins_ip) || wins_srv_is_dead(wins_ip, src_ip)) {
return;
}
d = (struct wins_dead *)malloc(sizeof(*d));
if (!d) return;
d->ip = ip;
d->dest_ip = wins_ip;
d->src_ip = src_ip;
d->revival = time(NULL) + DEATH_TIME;
DEBUG(4,("Marking wins server %s dead for %u seconds\n", inet_ntoa(ip), DEATH_TIME));
fstrcpy(src_name, inet_ntoa(src_ip));
DEBUG(4,("Marking wins server %s dead for %u seconds from source %s\n",
inet_ntoa(wins_ip), DEATH_TIME, src_name));
DLIST_ADD(dead_servers, d);
}
@ -127,6 +161,8 @@ unsigned wins_srv_count(void)
int count = 0;
if (lp_wins_support()) {
if (global_in_nmbd) return 0;
/* simple - just talk to ourselves */
return 1;
}
@ -134,7 +170,6 @@ unsigned wins_srv_count(void)
list = lp_wins_server_list();
for (count=0; list && list[count]; count++) /* nop */ ;
DEBUG(6,("Found %u wins servers in list\n", count));
return count;
}
@ -160,42 +195,6 @@ static void parse_ip(struct tagged_ip *ip, const char *str)
}
/*
return the IP of the currently active wins server, or the zero IP otherwise
*/
struct in_addr wins_srv_ip(void)
{
char **list;
int i;
struct tagged_ip t_ip;
/* if we are a wins server then we always just talk to ourselves */
if (lp_wins_support()) {
extern struct in_addr loopback_ip;
return loopback_ip;
}
list = lp_wins_server_list();
if (!list || !list[0]) {
zero_ip(&t_ip.ip);
return t_ip.ip;
}
/* find the first live one */
for (i=0; list[i]; i++) {
parse_ip(&t_ip, list[i]);
if (!wins_srv_is_dead(t_ip.ip)) {
DEBUG(6,("Current wins server is %s\n", inet_ntoa(t_ip.ip)));
return t_ip.ip;
}
}
/* damn, they are all dead. Keep trying the primary until they revive */
parse_ip(&t_ip, list[0]);
return t_ip.ip;
}
/*
return the list of wins server tags. A 'tag' is used to distinguish
@ -211,6 +210,7 @@ char **wins_srv_tags(void)
char **list;
if (lp_wins_support()) {
if (global_in_nmbd) return NULL;
/* give the caller something to chew on. This makes
the rest of the logic simpler (ie. less special cases) */
ret = (char **)malloc(sizeof(char *)*2);
@ -272,7 +272,7 @@ void wins_srv_tags_free(char **list)
return the IP of the currently active wins server for the given tag,
or the zero IP otherwise
*/
struct in_addr wins_srv_ip_tag(const char *tag)
struct in_addr wins_srv_ip_tag(const char *tag, struct in_addr src_ip)
{
char **list;
int i;
@ -298,8 +298,13 @@ struct in_addr wins_srv_ip_tag(const char *tag)
/* not for the right tag. Move along */
continue;
}
if (!wins_srv_is_dead(t_ip.ip)) {
DEBUG(6,("Current wins server for tag '%s' is %s\n", tag, inet_ntoa(t_ip.ip)));
if (!wins_srv_is_dead(t_ip.ip, src_ip)) {
fstring src_name;
fstrcpy(src_name, inet_ntoa(src_ip));
DEBUG(6,("Current wins server for tag '%s' with source %s is %s\n",
tag,
src_name,
inet_ntoa(t_ip.ip)));
return t_ip.ip;
}
}
@ -330,6 +335,7 @@ unsigned wins_srv_count_tag(const char *tag)
/* if we are a wins server then we always just talk to ourselves */
if (lp_wins_support()) {
if (global_in_nmbd) return 0;
return 1;
}

16
source/libsmb/namequery.c
View File

@ -637,12 +637,12 @@ BOOL name_resolve_bcast(const char *name, int name_type,
/********************************************************
Resolve via "wins" method.
*********************************************************/
BOOL resolve_wins(const char *name, int name_type,
struct in_addr **return_iplist, int *return_count)
{
int sock, t, i;
char **wins_tags;
struct in_addr src_ip;
*return_iplist = NULL;
*return_count = 0;
@ -662,15 +662,19 @@ BOOL resolve_wins(const char *name, int name_type,
return False;
}
/* the address we will be sending from */
src_ip = *interpret_addr2(lp_socket_address());
/* in the worst case we will try every wins server with every
tag! */
for (t=0; wins_tags && wins_tags[t]; t++) {
for (i=0; i<wins_srv_count_tag(wins_tags[t]); i++) {
int srv_count = wins_srv_count_tag(wins_tags[t]);
for (i=0; i<srv_count; i++) {
struct in_addr wins_ip;
int flags;
BOOL timed_out;
wins_ip = wins_srv_ip_tag(wins_tags[t]);
wins_ip = wins_srv_ip_tag(wins_tags[t], src_ip);
if (global_in_nmbd && ismyip(wins_ip)) {
/* yikes! we'll loop forever */
@ -678,13 +682,13 @@ BOOL resolve_wins(const char *name, int name_type,
}
/* skip any that have been unresponsive lately */
if (wins_srv_is_dead(wins_ip)) {
if (wins_srv_is_dead(wins_ip, src_ip)) {
continue;
}
DEBUG(3,("resolve_wins: using WINS server %s and tag '%s'\n", inet_ntoa(wins_ip), wins_tags[t]));
sock = open_socket_in(SOCK_DGRAM, 0, 3, interpret_addr(lp_socket_address()), True);
sock = open_socket_in(SOCK_DGRAM, 0, 3, src_ip.s_addr, True);
if (sock == -1) {
continue;
}
@ -699,7 +703,7 @@ BOOL resolve_wins(const char *name, int name_type,
if (timed_out) {
/* Timed out wating for WINS server to respond. Mark it dead. */
wins_srv_died(wins_ip);
wins_srv_died(wins_ip, src_ip);
} else {
/* The name definately isn't in this
group of WINS servers. goto the next group */

13
source/nmbd/nmbd.c
View File

@ -53,8 +53,8 @@ static void terminate(void)
/* Write out wins.dat file if samba is a WINS server */
wins_write_database(False);
/* Remove all SELF registered names. */
release_my_names();
/* Remove all SELF registered names from WINS */
release_wins_names();
/* Announce all server entries as 0 time-to-live, 0 type. */
announce_my_servers_removed();
@ -293,15 +293,6 @@ static BOOL reload_nmbd_services(BOOL test)
reload_nmbd_services( True );
}
/* Do a sanity check for a misconfigured nmbd */
if( lp_wins_support() && wins_srv_count() ) {
if( DEBUGLVL(0) ) {
dbgtext( "ERROR: 'wins support = true' and 'wins server = <server>'\n" );
dbgtext( "are conflicting settings. nmbd aborting.\n" );
}
exit(10);
}
return(ret);
}

286
source/nmbd/nmbd_incomingrequests.c
View File

@ -449,175 +449,151 @@ For broadcast name queries:
void process_name_query_request(struct subnet_record *subrec, struct packet_struct *p)
{
struct nmb_packet *nmb = &p->packet.nmb;
struct nmb_name *question = &nmb->question.question_name;
int name_type = question->name_type;
BOOL bcast = nmb->header.nm_flags.bcast;
int ttl=0;
int rcode = 0;
char *prdata = NULL;
char rdata[6];
BOOL success = False;
struct name_record *namerec = NULL;
int reply_data_len = 0;
int i;
DEBUG(3,("process_name_query_request: Name query from %s on subnet %s for name %s\n",
inet_ntoa(p->ip), subrec->subnet_name, nmb_namestr(question)));
struct nmb_packet *nmb = &p->packet.nmb;
struct nmb_name *question = &nmb->question.question_name;
int name_type = question->name_type;
BOOL bcast = nmb->header.nm_flags.bcast;
int ttl=0;
int rcode = 0;
char *prdata = NULL;
char rdata[6];
BOOL success = False;
struct name_record *namerec = NULL;
int reply_data_len = 0;
int i;
DEBUG(3,("process_name_query_request: Name query from %s on subnet %s for name %s\n",
inet_ntoa(p->ip), subrec->subnet_name, nmb_namestr(question)));
/* Look up the name in the cache - if the request is a broadcast request that
came from a subnet we don't know about then search all the broadcast subnets
for a match (as we don't know what interface the request came in on). */
/* Look up the name in the cache - if the request is a broadcast request that
came from a subnet we don't know about then search all the broadcast subnets
for a match (as we don't know what interface the request came in on). */
if(subrec == remote_broadcast_subnet)
namerec = find_name_for_remote_broadcast_subnet( question, FIND_ANY_NAME);
else
namerec = find_name_on_subnet(subrec, question, FIND_ANY_NAME);
if(subrec == remote_broadcast_subnet)
namerec = find_name_for_remote_broadcast_subnet( question, FIND_ANY_NAME);
else
namerec = find_name_on_subnet(subrec, question, FIND_ANY_NAME);
/* Check if it is a name that expired */
if (namerec &&
((namerec->data.death_time != PERMANENT_TTL) &&
(namerec->data.death_time < p->timestamp))) {
DEBUG(5,("process_name_query_request: expired name %s\n", nmb_namestr(&namerec->name)));
namerec = NULL;
}
/* Check if it is a name that expired */
if( namerec
&& ( (namerec->data.death_time != PERMANENT_TTL)
&& (namerec->data.death_time < p->timestamp) ) )
{
DEBUG(5,("process_name_query_request: expired name %s\n", nmb_namestr(&namerec->name)));
namerec = NULL;
}
if (namerec) {
/*
* Always respond to unicast queries.
* Don't respond to broadcast queries unless the query is for
* a name we own, a Primary Domain Controller name, or a WINS_PROXY
* name with type 0 or 0x20. WINS_PROXY names are only ever added
* into the namelist if we were configured as a WINS proxy.
*/
if (!bcast ||
(bcast && ((name_type == 0x1b) ||
(namerec->data.source == SELF_NAME) ||
(namerec->data.source == PERMANENT_NAME) ||
((namerec->data.source == WINS_PROXY_NAME) &&
((name_type == 0) || (name_type == 0x20)))))) {
/* The requested name is a directed query, or it's SELF or PERMANENT or WINS_PROXY,
or it's a Domain Master type. */
if (namerec)
{
/*
* If this is a WINS_PROXY_NAME, then ceck that none of the IP
* addresses we are returning is on the same broadcast subnet
* as the requesting packet. If it is then don't reply as the
* actual machine will be replying also and we don't want two
* replies to a broadcast query.
*/
if (namerec->data.source == WINS_PROXY_NAME) {
for( i = 0; i < namerec->data.num_ips; i++) {
if (same_net(namerec->data.ip[i], subrec->myip, subrec->mask_ip)) {
DEBUG(5,("process_name_query_request: name %s is a WINS proxy name and is also on the same subnet (%s) as the requestor. Not replying.\n",
nmb_namestr(&namerec->name), subrec->subnet_name ));
return;
}
}
}
/*
* Always respond to unicast queries.
* Don't respond to broadcast queries unless the query is for
* a name we own, a Primary Domain Controller name, or a WINS_PROXY
* name with type 0 or 0x20. WINS_PROXY names are only ever added
* into the namelist if we were configured as a WINS proxy.
*/
ttl = (namerec->data.death_time != PERMANENT_TTL) ?
namerec->data.death_time - p->timestamp : lp_max_ttl();
if( !bcast
|| ( bcast
&& ( (name_type == 0x1b)
|| (namerec->data.source == SELF_NAME)
|| (namerec->data.source == PERMANENT_NAME)
|| ( (namerec->data.source == WINS_PROXY_NAME)
&& ( (name_type == 0) || (name_type == 0x20) )
)
)
)
)
{
/* The requested name is a directed query, or it's SELF or PERMANENT or WINS_PROXY,
or it's a Domain Master type. */
/* Copy all known ip addresses into the return data. */
/* Optimise for the common case of one IP address so
we don't need a malloc. */
/*
* If this is a WINS_PROXY_NAME, then ceck that none of the IP
* addresses we are returning is on the same broadcast subnet
* as the requesting packet. If it is then don't reply as the
* actual machine will be replying also and we don't want two
* replies to a broadcast query.
*/
if (namerec->data.num_ips == 1) {
prdata = rdata;
} else {
if ((prdata = (char *)malloc( namerec->data.num_ips * 6 )) == NULL) {
DEBUG(0,("process_name_query_request: malloc fail !\n"));
return;
}
}
if( namerec->data.source == WINS_PROXY_NAME )
{
for( i = 0; i < namerec->data.num_ips; i++)
{
if(same_net( namerec->data.ip[i], subrec->myip, subrec->mask_ip ))
{
DEBUG(5,("process_name_query_request: name %s is a WINS proxy name and is also \
on the same subnet (%s) as the requestor. Not replying.\n",
nmb_namestr(&namerec->name), subrec->subnet_name ));
return;
}
}
}
for (i = 0; i < namerec->data.num_ips; i++) {
set_nb_flags(&prdata[i*6],namerec->data.nb_flags);
putip((char *)&prdata[2+(i*6)], &namerec->data.ip[i]);
}
ttl = (namerec->data.death_time != PERMANENT_TTL) ?
namerec->data.death_time - p->timestamp : lp_max_ttl();
sort_query_replies(prdata, i, p->ip);
reply_data_len = namerec->data.num_ips * 6;
success = True;
}
}
/* Copy all known ip addresses into the return data. */
/* Optimise for the common case of one IP address so
we don't need a malloc. */
/*
* If a machine is broadcasting a name lookup request and we have lp_wins_proxy()
* set we should initiate a WINS query here. On success we add the resolved name
* into our namelist with a type of WINS_PROXY_NAME and then reply to the query.
*/
if(!success && (namerec == NULL) && we_are_a_wins_client() && lp_wins_proxy() &&
bcast && (subrec != remote_broadcast_subnet)) {
make_wins_proxy_name_query_request( subrec, p, question );
return;
}
if( namerec->data.num_ips == 1 )
prdata = rdata;
else
{
if((prdata = (char *)malloc( namerec->data.num_ips * 6 )) == NULL)
{
DEBUG(0,("process_name_query_request: malloc fail !\n"));
return;
}
}
if (!success && bcast) {
if(prdata != rdata)
SAFE_FREE(prdata);
return; /* Never reply with a negative response to broadcasts. */
}
for( i = 0; i < namerec->data.num_ips; i++ )
{
set_nb_flags(&prdata[i*6],namerec->data.nb_flags);
putip((char *)&prdata[2+(i*6)], &namerec->data.ip[i]);
}
/*
* Final check. From observation, if a unicast packet is sent
* to a non-WINS server with the recursion desired bit set
* then never send a negative response.
*/
if(!success && !bcast && nmb->header.nm_flags.recursion_desired) {
if(prdata != rdata)
SAFE_FREE(prdata);
return;
}
sort_query_replies(prdata, i, p->ip);
reply_data_len = namerec->data.num_ips * 6;
success = True;
}
}
if (success) {
rcode = 0;
DEBUG(3,("OK\n"));
} else {
rcode = NAM_ERR;
DEBUG(3,("UNKNOWN\n"));
}
/*
* If a machine is broadcasting a name lookup request and we have lp_wins_proxy()
* set we should initiate a WINS query here. On success we add the resolved name
* into our namelist with a type of WINS_PROXY_NAME and then reply to the query.
*/
/* See rfc1002.txt 4.2.13. */
if(!success && (namerec == NULL) && we_are_a_wins_client() && lp_wins_proxy() &&
bcast && (subrec != remote_broadcast_subnet))
{
make_wins_proxy_name_query_request( subrec, p, question );
return;
}
if (!success && bcast)
{
if(prdata != rdata)
SAFE_FREE(prdata);
return; /* Never reply with a negative response to broadcasts. */
}
/*
* Final check. From observation, if a unicast packet is sent
* to a non-WINS server with the recursion desired bit set
* then never send a negative response.
*/
if(!success && !bcast && nmb->header.nm_flags.recursion_desired)
{
if(prdata != rdata)
SAFE_FREE(prdata);
return;
}
if (success)
{
rcode = 0;
DEBUG(3,("OK\n"));
}
else
{
rcode = NAM_ERR;
DEBUG(3,("UNKNOWN\n"));
}
/* See rfc1002.txt 4.2.13. */
reply_netbios_packet(p, /* Packet to reply to. */
rcode, /* Result code. */
NMB_QUERY, /* nmbd type code. */
NMB_NAME_QUERY_OPCODE, /* opcode. */
ttl, /* ttl. */
prdata, /* data to send. */
reply_data_len); /* data length. */
if(prdata != rdata)
SAFE_FREE(prdata);
reply_netbios_packet(p, /* Packet to reply to. */
rcode, /* Result code. */
NMB_QUERY, /* nmbd type code. */
NMB_NAME_QUERY_OPCODE, /* opcode. */
ttl, /* ttl. */
prdata, /* data to send. */
reply_data_len); /* data length. */
if(prdata != rdata)
SAFE_FREE(prdata);
}

89
source/nmbd/nmbd_mynames.c
View File

@ -184,67 +184,48 @@ BOOL register_my_workgroup_and_names(void)
/****************************************************************************
Remove all the names we registered.
**************************************************************************/
void release_my_names(void)
void release_wins_names(void)
{
#if 0 /*JRR: do WINS server only, otherwise clients ignore us when we come back up*/
struct subnet_record *subrec;
struct subnet_record *subrec = unicast_subnet;
struct name_record *namerec, *nextnamerec;
for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec))
#else
struct subnet_record *subrec = unicast_subnet;
#endif
{
struct name_record *namerec, *nextnamerec;
for (namerec = (struct name_record *)ubi_trFirst( subrec->namelist );
namerec;
namerec = nextnamerec)
{
nextnamerec = (struct name_record *)ubi_trNext( namerec );
if( (namerec->data.source == SELF_NAME)
&& !NAME_IS_DEREGISTERING(namerec) )
release_name( subrec, namerec, standard_success_release,
NULL, NULL);
}
}
for (namerec = (struct name_record *)ubi_trFirst( subrec->namelist );
namerec;
namerec = nextnamerec) {
nextnamerec = (struct name_record *)ubi_trNext( namerec );
if( (namerec->data.source == SELF_NAME)
&& !NAME_IS_DEREGISTERING(namerec) )
release_name( subrec, namerec, standard_success_release,
NULL, NULL);
}
}
/*******************************************************************
Refresh our registered names.
Refresh our registered names with WINS
******************************************************************/
void refresh_my_names(time_t t)
{
struct subnet_record *subrec;
struct name_record *namerec;
for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec))
{
struct name_record *namerec;
/* B nodes don't send out name refresh requests, see RFC 1001, 15.5.1 */
if (subrec != unicast_subnet)
continue;
for( namerec = (struct name_record *)ubi_trFirst( subrec->namelist );
namerec;
namerec = (struct name_record *)ubi_trNext( namerec ) )
{
/* Each SELF name has an individual time to be refreshed. */
if( (namerec->data.source == SELF_NAME)
&& (namerec->data.refresh_time < t)
&& ( namerec->data.death_time != PERMANENT_TTL) )
{
/* We cheat here and pretend the refresh is going to be
successful & update the refresh times. This stops
multiple refresh calls being done. We actually
deal with refresh failure in the fail_fn.
*/
if( !is_refresh_already_queued( subrec, namerec) )
refresh_name( subrec, namerec, NULL, NULL, NULL );
namerec->data.death_time = t + lp_max_ttl();
namerec->data.refresh_time = t + MIN(lp_max_ttl(), MAX_REFRESH_TIME);
}
}
}
if (wins_srv_count() < 1) return;
for (namerec = (struct name_record *)ubi_trFirst(unicast_subnet->namelist);
namerec;
namerec = (struct name_record *)ubi_trNext(namerec)) {
/* Each SELF name has an individual time to be refreshed. */
if ((namerec->data.source == SELF_NAME) &&
(namerec->data.refresh_time < t) &&
(namerec->data.death_time != PERMANENT_TTL)) {
/* We cheat here and pretend the refresh is going to be
successful & update the refresh times. This stops
multiple refresh calls being done. We actually
deal with refresh failure in the fail_fn.
*/
if (!is_refresh_already_queued(unicast_subnet, namerec)) {
wins_refresh_name(namerec);
}
namerec->data.death_time = t + lp_max_ttl();
namerec->data.refresh_time = t + MIN(lp_max_ttl(), MAX_REFRESH_TIME);
}
}
}

2
source/nmbd/nmbd_namelistdb.c
View File

@ -35,7 +35,7 @@ uint16 samba_nb_type = 0; /* samba's NetBIOS name type */
void set_samba_nb_type(void)
{
if( lp_wins_support() || wins_srv_count() )
samba_nb_type = NB_MFLAG; /* samba is a 'hybrid' node type. */
samba_nb_type = NB_HFLAG; /* samba is a 'hybrid' node type. */
else
samba_nb_type = NB_BFLAG; /* samba is broadcast-only node type. */
} /* set_samba_nb_type */

511
source/nmbd/nmbd_nameregister.c
View File

@ -25,6 +25,10 @@
extern fstring global_myworkgroup;
/* forward declarations */
static void wins_next_registration(struct response_record *rrec);
/****************************************************************************
Deal with a response packet when registering one of our names.
****************************************************************************/
@ -32,127 +36,131 @@ extern fstring global_myworkgroup;
static void register_name_response(struct subnet_record *subrec,
struct response_record *rrec, struct packet_struct *p)
{
/*
* If we are registering broadcast, then getting a response is an
* error - we do not have the name. If we are registering unicast,
* then we expect to get a response.
*/
/*
* If we are registering broadcast, then getting a response is an
* error - we do not have the name. If we are registering unicast,
* then we expect to get a response.
*/
struct nmb_packet *nmb = &p->packet.nmb;
BOOL bcast = nmb->header.nm_flags.bcast;
BOOL success = True;
struct nmb_name *question_name = &rrec->packet->packet.nmb.question.question_name;
struct nmb_name *answer_name = &nmb->answers->rr_name;
int ttl = 0;
uint16 nb_flags = 0;
struct in_addr registered_ip;
struct nmb_packet *nmb = &p->packet.nmb;
BOOL bcast = nmb->header.nm_flags.bcast;
BOOL success = True;
struct nmb_name *question_name = &rrec->packet->packet.nmb.question.question_name;
struct nmb_name *answer_name = &nmb->answers->rr_name;
struct nmb_packet *sent_nmb = &rrec->packet->packet.nmb;
int ttl = 0;
uint16 nb_flags = 0;
struct in_addr register_ip;
fstring reg_name;
putip(&register_ip,&sent_nmb->additional->rdata[2]);
fstrcpy(reg_name, inet_ntoa(register_ip));
if (subrec == unicast_subnet) {
/* we know that this wins server is definately alive - for the moment! */
wins_srv_alive(rrec->packet->ip, register_ip);
}
/* Sanity check. Ensure that the answer name in the incoming packet is the
same as the requested name in the outgoing packet. */
/* Sanity check. Ensure that the answer name in the incoming packet is the
same as the requested name in the outgoing packet. */
if(!question_name || !answer_name)
{
DEBUG(0,("register_name_response: malformed response (%s is NULL).\n",
question_name ? "question_name" : "answer_name" ));
return;
}
if(!question_name || !answer_name) {
DEBUG(0,("register_name_response: malformed response (%s is NULL).\n",
question_name ? "question_name" : "answer_name" ));
return;
}
if(!nmb_name_equal(question_name, answer_name))
{
DEBUG(0,("register_name_response: Answer name %s differs from question \
name %s.\n", nmb_namestr(answer_name), nmb_namestr(question_name)));
return;
}
if(bcast)
{
/*
* Special hack to cope with old Samba nmbd's.
* Earlier versions of Samba (up to 1.9.16p11) respond
* to a broadcast name registration of WORKGROUP<1b> when
* they should not. Hence, until these versions are gone,
* we should treat such errors as success for this particular
* case only. jallison@whistle.com.
*/
if(!nmb_name_equal(question_name, answer_name)) {
DEBUG(0,("register_name_response: Answer name %s differs from question name %s.\n",
nmb_namestr(answer_name), nmb_namestr(question_name)));
return;
}
if(bcast) {
/*
* Special hack to cope with old Samba nmbd's.
* Earlier versions of Samba (up to 1.9.16p11) respond
* to a broadcast name registration of WORKGROUP<1b> when
* they should not. Hence, until these versions are gone,
* we should treat such errors as success for this particular
* case only. jallison@whistle.com.
*/
#if 1 /* OLD_SAMBA_SERVER_HACK */
if((nmb->header.rcode == ACT_ERR) && strequal(global_myworkgroup, answer_name->name) &&
(answer_name->name_type == 0x1b))
{
/* Pretend we did not get this. */
rrec->num_msgs--;
if((nmb->header.rcode == ACT_ERR) && strequal(global_myworkgroup, answer_name->name) &&
(answer_name->name_type == 0x1b)) {
/* Pretend we did not get this. */
rrec->num_msgs--;
DEBUG(5,("register_name_response: Ignoring broadcast response to \
registration of name %s due to old Samba server bug.\n", nmb_namestr(answer_name)));
return;
}
DEBUG(5,("register_name_response: Ignoring broadcast response to registration of name %s due to old Samba server bug.\n",
nmb_namestr(answer_name)));
return;
}
#endif /* OLD_SAMBA_SERVER_HACK */
/* Someone else has the name. Log the problem. */
DEBUG(1,("register_name_response: Failed to register \
name %s on subnet %s via broadcast. Error code was %d. Reject came from IP %s\n",
nmb_namestr(answer_name),
subrec->subnet_name, nmb->header.rcode, inet_ntoa(p->ip)));
success = False;
}
else
{
/* Unicast - check to see if the response allows us to have the name. */
if(nmb->header.rcode != 0)
{
/* Error code - we didn't get the name. */
success = False;
/* Someone else has the name. Log the problem. */
DEBUG(1,("register_name_response: Failed to register name %s IP %s on subnet %s via broadcast. Error code was %d. Reject came from IP %s\n",
nmb_namestr(answer_name),
reg_name,
subrec->subnet_name, nmb->header.rcode, inet_ntoa(p->ip)));
success = False;
} else {
/* Unicast - check to see if the response allows us to have the name. */
if(nmb->header.rcode != 0) {
/* Error code - we didn't get the name. */
success = False;
DEBUG(0,("register_name_response: server at IP %s rejected our \
name registration of %s with error code %d.\n", inet_ntoa(p->ip),
nmb_namestr(answer_name), nmb->header.rcode));
DEBUG(0,("register_name_response: %sserver at IP %s rejected our name registration of %s IP %s with error code %d.\n",
subrec==unicast_subnet?"WINS ":"",
inet_ntoa(p->ip),
nmb_namestr(answer_name),
reg_name,
nmb->header.rcode));
} else if (nmb->header.opcode == NMB_WACK_OPCODE) {
/* WINS server is telling us to wait. Pretend we didn't get
the response but don't send out any more register requests. */
}
else if(nmb->header.opcode == NMB_WACK_OPCODE)
{
/* WINS server is telling us to wait. Pretend we didn't get
the response but don't send out any more register requests. */
DEBUG(5,("register_name_response: WACK from WINS server %s in registering name %s IP %s\n",
inet_ntoa(p->ip), nmb_namestr(answer_name), reg_name));
DEBUG(5,("register_name_response: WACK from WINS server %s in registering \
name %s on subnet %s.\n", inet_ntoa(p->ip), nmb_namestr(answer_name), subrec->subnet_name));
rrec->repeat_count = 0;
/* How long we should wait for. */
rrec->repeat_time = p->timestamp + nmb->answers->ttl;
rrec->num_msgs--;
return;
} else {
success = True;
/* Get the data we need to pass to the success function. */
nb_flags = get_nb_flags(nmb->answers->rdata);
ttl = nmb->answers->ttl;
rrec->repeat_count = 0;
/* How long we should wait for. */
rrec->repeat_time = p->timestamp + nmb->answers->ttl;
rrec->num_msgs--;
return;
}
else
{
success = True;
/* Get the data we need to pass to the success function. */
nb_flags = get_nb_flags(nmb->answers->rdata);
putip((char*)&registered_ip,&nmb->answers->rdata[2]);
ttl = nmb->answers->ttl;
}
}
/* send off a registration for the next IP, if any */
wins_next_registration(rrec);
}
}
DEBUG(5,("register_name_response: %s in registering name %s on subnet %s.\n",
success ? "success" : "failure", nmb_namestr(answer_name), subrec->subnet_name));
DEBUG(5,("register_name_response: %s in registering %sname %s IP %s with %s.\n",
success ? "success" : "failure",
subrec==unicast_subnet?"WINS ":"",
nmb_namestr(answer_name),
reg_name,
inet_ntoa(rrec->packet->ip)));
if(success)
{
/* Enter the registered name into the subnet name database before calling
the success function. */
standard_success_register(subrec, rrec->userdata, answer_name, nb_flags, ttl, registered_ip);
if( rrec->success_fn)
(*(register_name_success_function)rrec->success_fn)(subrec, rrec->userdata, answer_name, nb_flags, ttl, registered_ip);
}
else
{
if( rrec->fail_fn)
(*(register_name_fail_function)rrec->fail_fn)(subrec, rrec, question_name);
/* Remove the name. */
standard_fail_register( subrec, rrec, question_name);
}
if(success) {
/* Enter the registered name into the subnet name database before calling
the success function. */
standard_success_register(subrec, rrec->userdata, answer_name, nb_flags, ttl, register_ip);
if( rrec->success_fn)
(*(register_name_success_function)rrec->success_fn)(subrec, rrec->userdata, answer_name, nb_flags, ttl, register_ip);
} else {
if( rrec->fail_fn)
(*(register_name_fail_function)rrec->fail_fn)(subrec, rrec, question_name);
/* Remove the name. */
standard_fail_register( subrec, rrec, question_name);
}
/* Ensure we don't retry. */
remove_response_record(subrec, rrec);
/* Ensure we don't retry. */
remove_response_record(subrec, rrec);
}
@ -163,49 +171,68 @@ static void wins_registration_timeout(struct subnet_record *subrec,
struct response_record *rrec)
{
struct userdata_struct *userdata = rrec->userdata;
struct nmb_packet *sent_nmb = &rrec->packet->packet.nmb;
struct nmb_name *nmbname = &sent_nmb->question.question_name;
struct in_addr register_ip;
fstring src_addr;
DEBUG(2,("register_name_timeout_response: WINS server at address %s is not responding.\n",
inet_ntoa(rrec->packet->ip)));
putip(&register_ip,&sent_nmb->additional->rdata[2]);
/* mark it temporarily dead */
wins_srv_died(rrec->packet->ip);
fstrcpy(src_addr, inet_ntoa(register_ip));
DEBUG(2,("wins_registration_timeout: WINS server %s timed out registering IP %s\n",
inet_ntoa(rrec->packet->ip), src_addr));
/* mark it temporarily dead for this source address */
wins_srv_died(rrec->packet->ip, register_ip);
/* if we have some userdata then use that to work out what
wins server to try next */
if (userdata) {
const char *tag = (const char *)userdata->data;
struct nmb_packet *sent_nmb = &rrec->packet->packet.nmb;
struct nmb_name *nmbname = &sent_nmb->question.question_name;
/* and try the next wins server in our failover list */
rrec->packet->ip = wins_srv_ip_tag(tag);
/* also update the UNICODE subnet IPs */
subrec->bcast_ip = subrec->mask_ip = subrec->myip = rrec->packet->ip;
DEBUG(6,("Retrying register of name %s with WINS server %s using tag '%s'\n",
nmb_namestr(nmbname), inet_ntoa(rrec->packet->ip), tag));
/* try the next wins server in our failover list for
this tag */
rrec->packet->ip = wins_srv_ip_tag(tag, register_ip);
}
/* Keep trying to contact the WINS server periodically. This allows
us to work correctly if the WINS server is down temporarily when
we come up. */
/* if we have run out of wins servers for this tag then they
must all have timed out. We treat this as *success*, not
failure, and go into our standard name refresh mode. This
copes with all the wins servers being down */
if (wins_srv_is_dead(rrec->packet->ip, register_ip)) {
uint16 nb_flags = get_nb_flags(sent_nmb->additional->rdata);
int ttl = sent_nmb->additional->ttl;
standard_success_register(subrec, userdata, nmbname, nb_flags, ttl, register_ip);
if(rrec->success_fn) {
(*(register_name_success_function)rrec->success_fn)(subrec,
rrec->userdata,
nmbname,
nb_flags,
ttl,
register_ip);
}
/* send off a registration for the next IP, if any */
wins_next_registration(rrec);
/* don't need to send this packet any more */
remove_response_record(subrec, rrec);
return;
}
/* Reset the number of attempts to zero and double the interval between
retries. Max out at 5 minutes. */
rrec->repeat_count = 3;
rrec->repeat_interval *= 2;
if(rrec->repeat_interval > (5 * 60))
rrec->repeat_interval = (5 * 60);
rrec->repeat_time = time(NULL) + rrec->repeat_interval;
/* we will be moving to the next WINS server for this group,
send it immediately */
rrec->repeat_count = 2;
rrec->repeat_time = time(NULL) + 1;
rrec->in_expiration_processing = False;
DEBUG(5,("register_name_timeout_response: increasing WINS timeout to %d seconds.\n",
(int)rrec->repeat_interval));
DEBUG(6,("Retrying register of name %s IP %s with WINS server %s\n",
nmb_namestr(nmbname), src_addr, inet_ntoa(rrec->packet->ip)));
/* notice that we don't remove the response record. This keeps
us trying to register with each of our failover wins
servers until we succeed */
us trying to register with each of our failover wins servers */
}
@ -241,13 +268,9 @@ static void register_name_timeout_response(struct subnet_record *subrec,
putip(&registered_ip,&sent_nmb->additional->rdata[2]);
}
} else {
/* Unicast - if no responses then it's an error. */
if(rrec->num_msgs == 0) {
wins_registration_timeout(subrec, rrec);
return;
}
/* we got responses, but timed out?? bizarre. Treat it as failure. */
/* wins timeouts are special */
wins_registration_timeout(subrec, rrec);
return;
}
DEBUG(5,("register_name_timeout_response: %s in registering name %s on subnet %s.\n",
@ -281,7 +304,8 @@ static void multihomed_register_one(struct nmb_name *nmbname,
const char *tag)
{
struct userdata_struct *userdata;
struct in_addr wins_ip = wins_srv_ip_tag(tag);
struct in_addr wins_ip = wins_srv_ip_tag(tag, ip);
fstring ip_str;
userdata = (struct userdata_struct *)malloc(sizeof(*userdata) + strlen(tag) + 1);
if (!userdata) {
@ -292,8 +316,10 @@ static void multihomed_register_one(struct nmb_name *nmbname,
userdata->userdata_len = strlen(tag) + 1;
strlcpy(userdata->data, tag, userdata->userdata_len);
DEBUG(6,("Registering name %s with WINS server %s using tag '%s'\n",
nmb_namestr(nmbname), inet_ntoa(wins_ip), tag));
fstrcpy(ip_str, inet_ntoa(ip));
DEBUG(6,("Registering name %s IP %s with WINS server %s using tag '%s'\n",
nmb_namestr(nmbname), ip_str, inet_ntoa(wins_ip), tag));
if (queue_register_multihomed_name(unicast_subnet,
register_name_response,
@ -308,14 +334,65 @@ static void multihomed_register_one(struct nmb_name *nmbname,
DEBUG(0,("multihomed_register_one: Failed to send packet trying to register name %s IP %s\n",
nmb_namestr(nmbname), inet_ntoa(ip)));
}
free(userdata);
}
/****************************************************************************
we have finished the registration of one IP and need to see if we have
any more IPs left to register with this group of wins server for this name
****************************************************************************/
static void wins_next_registration(struct response_record *rrec)
{
struct nmb_packet *sent_nmb = &rrec->packet->packet.nmb;
struct nmb_name *nmbname = &sent_nmb->question.question_name;
uint16 nb_flags = get_nb_flags(sent_nmb->additional->rdata);
struct userdata_struct *userdata = rrec->userdata;
const char *tag;
struct in_addr last_ip;
struct subnet_record *subrec;
putip(&last_ip,&sent_nmb->additional->rdata[2]);
if (!userdata) {
/* it wasn't multi-homed */
return;
}
tag = (const char *)userdata->data;
for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
if (ip_equal(last_ip, subrec->myip)) {
subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec);
break;
}
}
if (!subrec) {
/* no more to do! */
return;
}
switch (sent_nmb->header.opcode) {
case NMB_NAME_MULTIHOMED_REG_OPCODE:
multihomed_register_one(nmbname, nb_flags, NULL, NULL, subrec->myip, tag);
break;
case NMB_NAME_REFRESH_OPCODE_8:
queue_wins_refresh(nmbname,
register_name_response,
register_name_timeout_response,
nb_flags, subrec->myip, tag);
break;
}
}
/****************************************************************************
Try and register one of our names on the unicast subnet - multihomed.
****************************************************************************/
static BOOL multihomed_register_name( struct nmb_name *nmbname, uint16 nb_flags,
register_name_success_function success_fn,
register_name_fail_function fail_fn)
static void multihomed_register_name(struct nmb_name *nmbname, uint16 nb_flags,
register_name_success_function success_fn,
register_name_fail_function fail_fn)
{
/*
If we are adding a group name, we just send multiple
@ -338,16 +415,16 @@ static BOOL multihomed_register_name( struct nmb_name *nmbname, uint16 nb_flags,
*/
int num_ips=0;
int i, t;
struct in_addr *ip_list = NULL;
struct subnet_record *subrec;
char **wins_tags;
struct in_addr *ip_list;
for(subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec) )
num_ips++;
if((ip_list = (struct in_addr *)malloc(num_ips * sizeof(struct in_addr)))==NULL) {
DEBUG(0,("multihomed_register_name: malloc fail !\n"));
return True;
return;
}
for (subrec = FIRST_SUBNET, i = 0;
@ -356,106 +433,92 @@ static BOOL multihomed_register_name( struct nmb_name *nmbname, uint16 nb_flags,
ip_list[i] = subrec->myip;
}
(void)add_name_to_subnet( unicast_subnet, nmbname->name, nmbname->name_type,
nb_flags, lp_max_ttl(), SELF_NAME,
num_ips, ip_list);
add_name_to_subnet(unicast_subnet, nmbname->name, nmbname->name_type,
nb_flags, lp_max_ttl(), SELF_NAME,
num_ips, ip_list);
/* get the list of wins tags - we try to register for each of them */
wins_tags = wins_srv_tags();
/* Now try and register the name, num_ips times for each wins tag. */
for (t=0; wins_tags[t]; t++) {
for (i = 0; i < num_ips; i++) {
multihomed_register_one(nmbname, nb_flags,
success_fn, fail_fn,
ip_list[i],
wins_tags[t]);
}
/* Now try and register the name for each wins tag. Note that
at this point we only register our first IP with each wins
group. We will register the rest from
wins_next_registration() when we get the reply for this
one. That follows the way W2K does things (tridge)
*/
for (t=0; wins_tags && wins_tags[t]; t++) {
multihomed_register_one(nmbname, nb_flags,
success_fn, fail_fn,
ip_list[0],
wins_tags[t]);
}
wins_srv_tags_free(wins_tags);
SAFE_FREE(ip_list);
return False;
}
/****************************************************************************
Try and register one of our names.
****************************************************************************/
BOOL register_name(struct subnet_record *subrec,
void register_name(struct subnet_record *subrec,
char *name, int type, uint16 nb_flags,
register_name_success_function success_fn,
register_name_fail_function fail_fn,
struct userdata_struct *userdata)
{
struct nmb_name nmbname;
struct nmb_name nmbname;
make_nmb_name(&nmbname, name, type);
make_nmb_name(&nmbname, name, type);
/* Always set the NB_ACTIVE flag on the name we are
registering. Doesn't make sense without it.
*/
nb_flags |= NB_ACTIVE;
/* If this is the unicast subnet, and we are a multi-homed
host, then register a multi-homed name. */
if( (subrec == unicast_subnet) && we_are_multihomed()) {
return multihomed_register_name(&nmbname, nb_flags,
success_fn, fail_fn);
}
if(queue_register_name( subrec,
register_name_response,
register_name_timeout_response,
success_fn,
fail_fn,
userdata,
&nmbname,
nb_flags) == NULL)
{
DEBUG(0,("register_name: Failed to send packet trying to register name %s\n",
nmb_namestr(&nmbname)));
return True;
}
return False;
/* Always set the NB_ACTIVE flag on the name we are
registering. Doesn't make sense without it.
*/
nb_flags |= NB_ACTIVE;
if (subrec == unicast_subnet) {
/* we now always do multi-homed registration if we are
registering to a WINS server. This copes much
better with complex WINS setups */
multihomed_register_name(&nmbname, nb_flags,
success_fn, fail_fn);
return;
}
if (queue_register_name(subrec,
register_name_response,
register_name_timeout_response,
success_fn,
fail_fn,
userdata,
&nmbname,
nb_flags) == NULL) {
DEBUG(0,("register_name: Failed to send packet trying to register name %s\n",
nmb_namestr(&nmbname)));
}
}
/****************************************************************************
Try and refresh one of our names.
Try and refresh one of our names. This is *only* called for WINS refresh
****************************************************************************/
BOOL refresh_name(struct subnet_record *subrec, struct name_record *namerec,
refresh_name_success_function success_fn,
refresh_name_fail_function fail_fn,
struct userdata_struct *userdata)
void wins_refresh_name(struct name_record *namerec)
{
int i;
int t;
char **wins_tags;
/*
* Go through and refresh the name for all known ip addresses.
* Only call the success/fail function on the last one (it should
* only be done once).
*/
/* get the list of wins tags - we try to refresh for each of them */
wins_tags = wins_srv_tags();
for( i = 0; i < namerec->data.num_ips; i++)
{
if(queue_refresh_name( subrec,
register_name_response,
register_name_timeout_response,
(i == (namerec->data.num_ips - 1)) ? success_fn : NULL,
(i == (namerec->data.num_ips - 1)) ? fail_fn : NULL,
(i == (namerec->data.num_ips - 1)) ? userdata : NULL,
namerec,
namerec->data.ip[i]) == NULL)
{
DEBUG(0,("refresh_name: Failed to send packet trying to refresh name %s\n",
nmb_namestr(&namerec->name)));
return True;
}
}
return False;
for (t=0; wins_tags && wins_tags[t]; t++) {
queue_wins_refresh(&namerec->name,
register_name_response,
register_name_timeout_response,
namerec->data.nb_flags,
namerec->data.ip[0], wins_tags[t]);
}
wins_srv_tags_free(wins_tags);
}

330
source/nmbd/nmbd_namerelease.c
View File

@ -28,85 +28,72 @@
****************************************************************************/
static void release_name_response(struct subnet_record *subrec,
struct response_record *rrec, struct packet_struct *p)
struct response_record *rrec, struct packet_struct *p)
{
/*
* If we are releasing broadcast, then getting a response is an
* error. If we are releasing unicast, then we expect to get a response.
*/
/*
* If we are releasing broadcast, then getting a response is an
* error. If we are releasing unicast, then we expect to get a response.
*/
struct nmb_packet *nmb = &p->packet.nmb;
BOOL bcast = nmb->header.nm_flags.bcast;
BOOL success = True;
struct nmb_name *question_name = &rrec->packet->packet.nmb.question.question_name;
struct nmb_name *answer_name = &nmb->answers->rr_name;
struct in_addr released_ip;
struct nmb_packet *nmb = &p->packet.nmb;
BOOL bcast = nmb->header.nm_flags.bcast;
BOOL success = True;
struct nmb_name *question_name = &rrec->packet->packet.nmb.question.question_name;
struct nmb_name *answer_name = &nmb->answers->rr_name;
struct in_addr released_ip;
/* Sanity check. Ensure that the answer name in the incoming packet is the
same as the requested name in the outgoing packet. */
if (!nmb_name_equal(question_name, answer_name)) {
DEBUG(0,("release_name_response: Answer name %s differs from question name %s.\n",
nmb_namestr(answer_name), nmb_namestr(question_name)));
return;
}
/* Sanity check. Ensure that the answer name in the incoming packet is the
same as the requested name in the outgoing packet. */
if (bcast) {
/* Someone sent a response to a bcast release? ignore it. */
return;
}
if(!nmb_name_equal(question_name, answer_name))
{
DEBUG(0,("release_name_response: Answer name %s differs from question \
name %s.\n", nmb_namestr(answer_name), nmb_namestr(question_name)));
return;
}
/* Unicast - check to see if the response allows us to release the name. */
if (nmb->header.rcode != 0) {
/* Error code - we were told not to release the name ! What now ! */
success = False;
if(bcast)
{
/* Someone sent a response. This shouldn't happen/ */
DEBUG(1,("release_name_response: A response for releasing name %s was received on a \
broadcast subnet %s. This should not happen !\n", nmb_namestr(answer_name), subrec->subnet_name));
return;
}
else
{
/* Unicast - check to see if the response allows us to release the name. */
if(nmb->header.rcode != 0)
{
/* Error code - we were told not to release the name ! What now ! */
success = False;
DEBUG(0,("release_name_response: WINS server at IP %s rejected our \
name release of name %s with error code %d.\n",
inet_ntoa(p->ip),
nmb_namestr(answer_name), nmb->header.rcode));
} else if (nmb->header.opcode == NMB_WACK_OPCODE) {
/* WINS server is telling us to wait. Pretend we didn't get
the response but don't send out any more release requests. */
DEBUG(0,("release_name_response: WINS server at IP %s rejected our \
name release of name %s with error code %d.\n", inet_ntoa(p->ip),
nmb_namestr(answer_name), nmb->header.rcode));
DEBUG(5,("release_name_response: WACK from WINS server %s in releasing \
name %s on subnet %s.\n",
inet_ntoa(p->ip), nmb_namestr(answer_name), subrec->subnet_name));
}
else if(nmb->header.opcode == NMB_WACK_OPCODE)
{
/* WINS server is telling us to wait. Pretend we didn't get
the response but don't send out any more release requests. */
rrec->repeat_count = 0;
/* How long we should wait for. */
rrec->repeat_time = p->timestamp + nmb->answers->ttl;
rrec->num_msgs--;
return;
}
DEBUG(5,("release_name_response: WACK from WINS server %s in releasing \
name %s on subnet %s.\n", inet_ntoa(p->ip), nmb_namestr(answer_name), subrec->subnet_name));
DEBUG(5,("release_name_response: %s in releasing name %s on subnet %s.\n",
success ? "success" : "failure", nmb_namestr(answer_name), subrec->subnet_name));
if (success) {
putip((char*)&released_ip ,&nmb->answers->rdata[2]);
rrec->repeat_count = 0;
/* How long we should wait for. */
rrec->repeat_time = p->timestamp + nmb->answers->ttl;
rrec->num_msgs--;
return;
}
}
if(rrec->success_fn)
(*(release_name_success_function)rrec->success_fn)(subrec, rrec->userdata, answer_name, released_ip);
standard_success_release( subrec, rrec->userdata, answer_name, released_ip);
} else {
/* We have no standard_fail_release - maybe we should add one ? */
if (rrec->fail_fn) {
(*(release_name_fail_function)rrec->fail_fn)(subrec, rrec, answer_name);
}
}
DEBUG(5,("release_name_response: %s in releasing name %s on subnet %s.\n",
success ? "success" : "failure", nmb_namestr(answer_name), subrec->subnet_name));
if(success)
{
putip((char*)&released_ip ,&nmb->answers->rdata[2]);
if(rrec->success_fn)
(*(release_name_success_function)rrec->success_fn)(subrec, rrec->userdata, answer_name, released_ip);
standard_success_release( subrec, rrec->userdata, answer_name, released_ip);
}
else
{
/* We have no standard_fail_release - maybe we should add one ? */
if(rrec->fail_fn)
(*(release_name_fail_function)rrec->fail_fn)(subrec, rrec, answer_name);
}
remove_response_record(subrec, rrec);
remove_response_record(subrec, rrec);
}
/****************************************************************************
@ -114,125 +101,122 @@ name %s on subnet %s.\n", inet_ntoa(p->ip), nmb_namestr(answer_name), subrec->su
****************************************************************************/
static void release_name_timeout_response(struct subnet_record *subrec,
struct response_record *rrec)
struct response_record *rrec)
{
/*
* If we are releasing unicast, then NOT getting a response is an
* error - we could not release the name. If we are releasing broadcast,
* then we don't expect to get a response.
*/
/* a release is *always* considered to be successful when it
times out. This doesn't cause problems as if a WINS server
doesn't respond and someone else wants the name then the
normal WACK/name query from the WINS server will cope */
struct nmb_packet *sent_nmb = &rrec->packet->packet.nmb;
BOOL bcast = sent_nmb->header.nm_flags.bcast;
struct nmb_name *question_name = &sent_nmb->question.question_name;
struct in_addr released_ip;
struct nmb_packet *sent_nmb = &rrec->packet->packet.nmb;
BOOL bcast = sent_nmb->header.nm_flags.bcast;
BOOL success = False;
struct nmb_name *question_name = &sent_nmb->question.question_name;
struct in_addr released_ip;
/* Get the ip address we were trying to release. */
putip((char*)&released_ip ,&sent_nmb->additional->rdata[2]);
if(bcast)
{
if(rrec->num_msgs == 0)
{
/* Not receiving a message is success for broadcast release. */
success = True;
if (!bcast) {
/* mark the WINS server temporarily dead */
wins_srv_died(rrec->packet->ip, released_ip);
}
/* Get the ip address we were trying to release. */
putip((char*)&released_ip ,&sent_nmb->additional->rdata[2]);
}
}
else
{
/* Unicast - if no responses then it's an error. */
if(rrec->num_msgs == 0)
{
DEBUG(2,("release_name_timeout_response: WINS server at address %s is not \
responding.\n", inet_ntoa(rrec->packet->ip)));
DEBUG(5,("release_name_timeout_response: success in releasing name %s on subnet %s.\n",
nmb_namestr(question_name), subrec->subnet_name));
/* mark it temporarily dead */
wins_srv_died(rrec->packet->ip);
if (rrec->success_fn) {
(*(release_name_success_function)rrec->success_fn)(subrec, rrec->userdata, question_name, released_ip);
}
/* and try the next wins server */
rrec->packet->ip = wins_srv_ip();
/* also update the UNICODE subnet IPs */
subrec->bcast_ip = subrec->mask_ip = subrec->myip = rrec->packet->ip;
/* Reset the number of attempts to zero and double the interval between
retries. Max out at 5 minutes. */
rrec->repeat_count = 3;
rrec->repeat_interval *= 2;
if(rrec->repeat_interval > (5 * 60))
rrec->repeat_interval = (5 * 60);
rrec->repeat_time = time(NULL) + rrec->repeat_interval;
DEBUG(5,("release_name_timeout_response: increasing WINS timeout to %d seconds.\n",
(int)rrec->repeat_interval));
return; /* Don't remove the response record. */
}
}
DEBUG(5,("release_name_timeout_response: %s in releasing name %s on subnet %s.\n",
success ? "success" : "failure", nmb_namestr(question_name), subrec->subnet_name));
if(success && rrec->success_fn)
{
if(rrec->success_fn)
(*(release_name_success_function)rrec->success_fn)(subrec, rrec->userdata, question_name, released_ip);
standard_success_release( subrec, rrec->userdata, question_name, released_ip);
}
else
{
/* We have no standard_fail_release - maybe we should add one ? */
if( rrec->fail_fn)
(*(release_name_fail_function)rrec->fail_fn)(subrec, rrec, question_name);
}
remove_response_record(subrec, rrec);
standard_success_release( subrec, rrec->userdata, question_name, released_ip);
remove_response_record(subrec, rrec);
}
/*
when releasing a name with WINS we need to send the release to each of
the WINS groups
*/
static void wins_release_name(struct name_record *namerec,
release_name_success_function success_fn,
release_name_fail_function fail_fn,
struct userdata_struct *userdata)
{
int t, i;
char **wins_tags;
/* get the list of wins tags - we try to release for each of them */
wins_tags = wins_srv_tags();
for (t=0;wins_tags && wins_tags[t]; t++) {
for (i = 0; i < namerec->data.num_ips; i++) {
struct in_addr wins_ip = wins_srv_ip_tag(wins_tags[t], namerec->data.ip[i]);
BOOL last_one = ((i==namerec->data.num_ips - 1) && !wins_tags[t+1]);
if (queue_release_name(unicast_subnet,
release_name_response,
release_name_timeout_response,
last_one?success_fn : NULL,
last_one? fail_fn : NULL,
last_one? userdata : NULL,
&namerec->name,
namerec->data.nb_flags,
namerec->data.ip[i],
wins_ip) == NULL) {
DEBUG(0,("release_name: Failed to send packet trying to release name %s IP %s\n",
nmb_namestr(&namerec->name), inet_ntoa(namerec->data.ip[i]) ));
}
}
}
wins_srv_tags_free(wins_tags);
}
/****************************************************************************
Try and release one of our names.
****************************************************************************/
BOOL release_name(struct subnet_record *subrec, struct name_record *namerec,
release_name_success_function success_fn,
release_name_fail_function fail_fn,
struct userdata_struct *userdata)
void release_name(struct subnet_record *subrec, struct name_record *namerec,
release_name_success_function success_fn,
release_name_fail_function fail_fn,
struct userdata_struct *userdata)
{
int i;
int i;
/* Ensure it's a SELF name, and in the ACTIVE state. */
if((namerec->data.source != SELF_NAME) || !NAME_IS_ACTIVE(namerec))
{
DEBUG(0,("release_name: Cannot release name %s from subnet %s. Source was %d \n",
nmb_namestr(&namerec->name), subrec->subnet_name, namerec->data.source));
return True;
}
/* Ensure it's a SELF name, and in the ACTIVE state. */
if ((namerec->data.source != SELF_NAME) || !NAME_IS_ACTIVE(namerec)) {
DEBUG(0,("release_name: Cannot release name %s from subnet %s. Source was %d \n",
nmb_namestr(&namerec->name), subrec->subnet_name, namerec->data.source));
return;
}
/* Set the name into the deregistering state. */
namerec->data.nb_flags |= NB_DEREG;
/* Set the name into the deregistering state. */
namerec->data.nb_flags |= NB_DEREG;
/*
* Go through and release the name for all known ip addresses.
* Only call the success/fail function on the last one (it should
* only be done once).
*/
/* wins releases are a bit different */
if (subrec == unicast_subnet) {
wins_release_name(namerec, success_fn, fail_fn, userdata);
return;
}
for( i = 0; i < namerec->data.num_ips; i++)
{
if(queue_release_name( subrec,
release_name_response,
release_name_timeout_response,
(i == (namerec->data.num_ips - 1)) ? success_fn : NULL,
(i == (namerec->data.num_ips - 1)) ? fail_fn : NULL,
(i == (namerec->data.num_ips - 1)) ? userdata : NULL,
&namerec->name,
namerec->data.nb_flags,
namerec->data.ip[i]) == NULL)
{
DEBUG(0,("release_name: Failed to send packet trying to release name %s IP %s\n",
nmb_namestr(&namerec->name), inet_ntoa(namerec->data.ip[i]) ));
return True;
}
}
return False;
/*
* Go through and release the name for all known ip addresses.
* Only call the success/fail function on the last one (it should
* only be done once).
*/
for (i = 0; i < namerec->data.num_ips; i++) {
if (queue_release_name(subrec,
release_name_response,
release_name_timeout_response,
(i == (namerec->data.num_ips - 1)) ? success_fn : NULL,
(i == (namerec->data.num_ips - 1)) ? fail_fn : NULL,
(i == (namerec->data.num_ips - 1)) ? userdata : NULL,
&namerec->name,
namerec->data.nb_flags,
namerec->data.ip[i],
subrec->bcast_ip) == NULL) {
DEBUG(0,("release_name: Failed to send packet trying to release name %s IP %s\n",
nmb_namestr(&namerec->name), inet_ntoa(namerec->data.ip[i]) ));
}
}
}

230
source/nmbd/nmbd_packets.c
View File

@ -237,48 +237,44 @@ static BOOL create_and_init_additional_record(struct packet_struct *packet,
uint16 nb_flags,
struct in_addr *register_ip)
{
struct nmb_packet *nmb = &packet->packet.nmb;
struct nmb_packet *nmb = &packet->packet.nmb;
if((nmb->additional = (struct res_rec *)malloc(sizeof(struct res_rec))) == NULL)
{
DEBUG(0,("initiate_name_register_packet: malloc fail for additional record.\n"));
return False;
}
if((nmb->additional = (struct res_rec *)malloc(sizeof(struct res_rec))) == NULL) {
DEBUG(0,("initiate_name_register_packet: malloc fail for additional record.\n"));
return False;
}
memset((char *)nmb->additional,'\0',sizeof(struct res_rec));
memset((char *)nmb->additional,'\0',sizeof(struct res_rec));
nmb->additional->rr_name = nmb->question.question_name;
nmb->additional->rr_type = RR_TYPE_NB;
nmb->additional->rr_class = RR_CLASS_IN;
nmb->additional->rr_name = nmb->question.question_name;
nmb->additional->rr_type = RR_TYPE_NB;
nmb->additional->rr_class = RR_CLASS_IN;
/* See RFC 1002, sections 5.1.1.1, 5.1.1.2 and 5.1.1.3 */
if (nmb->header.nm_flags.bcast)
nmb->additional->ttl = PERMANENT_TTL;
else
nmb->additional->ttl = lp_max_ttl();
nmb->additional->rdlength = 6;
set_nb_flags(nmb->additional->rdata,nb_flags);
/* Set the address for the name we are registering. */
putip(&nmb->additional->rdata[2], register_ip);
/*
it turns out that Jeremys code was correct, we are supposed
to send registrations from the IP we are registering. The
trick is what to do on timeouts! When we send on a
non-routable IP then the reply will timeout, and we should
treat this as success, not failure. That means we go into
our standard refresh cycle for that name which copes nicely
with disconnected networks.
*/
packet->fd = find_subnet_fd_for_address(*register_ip);
/* See RFC 1002, sections 5.1.1.1, 5.1.1.2 and 5.1.1.3 */
if (nmb->header.nm_flags.bcast)
nmb->additional->ttl = PERMANENT_TTL;
else
nmb->additional->ttl = lp_max_ttl();
nmb->additional->rdlength = 6;
set_nb_flags(nmb->additional->rdata,nb_flags);
/* Set the address for the name we are registering. */
putip(&nmb->additional->rdata[2], register_ip);
#if 0
/* I removed this forced source IP as it breaks wins failover. The
problem is that our 2nd interface IP may not be routable to the
wins server, in which case all these nice packets we are senidng
out will never get a response and we end up marking a perfectly good wins server dead.
In general I can't see any reason why we should force the source
ip on a packet anyway. We should just let the kernels routin
table take care of it, as that is the only place which really
knows what is routable and what isn't. (tridge)
*/
packet->fd = find_subnet_fd_for_address( *register_ip );
#endif
return True;
return True;
}
/***************************************************************************
@ -353,28 +349,28 @@ static BOOL initiate_name_register_packet( struct packet_struct *packet,
Sends out a multihomed name register.
**************************************************************************/
static BOOL initiate_multihomed_name_register_packet( struct packet_struct *packet,
uint16 nb_flags, struct in_addr *register_ip)
static BOOL initiate_multihomed_name_register_packet(struct packet_struct *packet,
uint16 nb_flags, struct in_addr *register_ip)
{
struct nmb_packet *nmb = &packet->packet.nmb;
fstring second_ip_buf;
struct nmb_packet *nmb = &packet->packet.nmb;
fstring second_ip_buf;
fstrcpy(second_ip_buf, inet_ntoa(packet->ip));
fstrcpy(second_ip_buf, inet_ntoa(packet->ip));
nmb->header.opcode = NMB_NAME_MULTIHOMED_REG_OPCODE;
nmb->header.arcount = 1;
nmb->header.opcode = NMB_NAME_MULTIHOMED_REG_OPCODE;
nmb->header.arcount = 1;
nmb->header.nm_flags.recursion_desired = True;
if(create_and_init_additional_record(packet, nb_flags, register_ip) == False)
return False;
DEBUG(4,("initiate_multihomed_name_register_packet: sending registration \
nmb->header.nm_flags.recursion_desired = True;
if(create_and_init_additional_record(packet, nb_flags, register_ip) == False)
return False;
DEBUG(4,("initiate_multihomed_name_register_packet: sending registration \
for name %s IP %s (bcast=%s) to IP %s\n",
nmb_namestr(&nmb->additional->rr_name), inet_ntoa(*register_ip),
BOOLSTR(nmb->header.nm_flags.bcast), second_ip_buf ));
nmb_namestr(&nmb->additional->rr_name), inet_ntoa(*register_ip),
BOOLSTR(nmb->header.nm_flags.bcast), second_ip_buf ));
return send_netbios_packet( packet );
return send_netbios_packet( packet );
}
/***************************************************************************
@ -518,6 +514,67 @@ struct response_record *queue_register_name( struct subnet_record *subrec,
return rrec;
}
/****************************************************************************
Queue a refresh name packet to the broadcast address of a subnet.
****************************************************************************/
void queue_wins_refresh(struct nmb_name *nmbname,
response_function resp_fn,
timeout_response_function timeout_fn,
uint16 nb_flags,
struct in_addr refresh_ip,
const char *tag)
{
struct packet_struct *p;
struct response_record *rrec;
struct in_addr wins_ip;
struct userdata_struct *userdata;
fstring ip_str;
wins_ip = wins_srv_ip_tag(tag, refresh_ip);
if ((p = create_and_init_netbios_packet(nmbname, False, False, wins_ip)) == NULL) {
return;
}
if (!initiate_name_refresh_packet(p, nb_flags, &refresh_ip)) {
p->locked = False;
free_packet(p);
return;
}
fstrcpy(ip_str, inet_ntoa(refresh_ip));
DEBUG(6,("Refreshing name %s IP %s with WINS server %s using tag '%s'\n",
nmb_namestr(nmbname), ip_str, inet_ntoa(wins_ip), tag));
userdata = (struct userdata_struct *)malloc(sizeof(*userdata) + strlen(tag) + 1);
if (!userdata) {
DEBUG(0,("Failed to allocate userdata structure!\n"));
return;
}
ZERO_STRUCTP(userdata);
userdata->userdata_len = strlen(tag) + 1;
strlcpy(userdata->data, tag, userdata->userdata_len);
if ((rrec = make_response_record(unicast_subnet,
p,
resp_fn, timeout_fn,
NULL,
NULL,
userdata)) == NULL) {
p->locked = False;
free_packet(p);
return;
}
free(userdata);
/* we don't want to repeat refresh packets */
rrec->repeat_count = 0;
}
/****************************************************************************
Queue a multihomed register name packet to a given WINS server IP
****************************************************************************/
@ -581,14 +638,15 @@ unicast subnet. subnet is %s\n.", subrec->subnet_name ));
****************************************************************************/
struct response_record *queue_release_name( struct subnet_record *subrec,
response_function resp_fn,
timeout_response_function timeout_fn,
release_name_success_function success_fn,
release_name_fail_function fail_fn,
struct userdata_struct *userdata,
struct nmb_name *nmbname,
uint16 nb_flags,
struct in_addr release_ip)
response_function resp_fn,
timeout_response_function timeout_fn,
release_name_success_function success_fn,
release_name_fail_function fail_fn,
struct userdata_struct *userdata,
struct nmb_name *nmbname,
uint16 nb_flags,
struct in_addr release_ip,
struct in_addr dest_ip)
{
struct packet_struct *p;
struct response_record *rrec;
@ -597,7 +655,7 @@ struct response_record *queue_release_name( struct subnet_record *subrec,
return NULL;
if ((p = create_and_init_netbios_packet(nmbname, (subrec != unicast_subnet), False,
subrec->bcast_ip)) == NULL)
dest_ip)) == NULL)
return NULL;
if(initiate_name_release_packet( p, nb_flags, &release_ip) == False)
@ -633,52 +691,6 @@ struct response_record *queue_release_name( struct subnet_record *subrec,
return rrec;
}
/****************************************************************************
Queue a refresh name packet to the broadcast address of a subnet.
****************************************************************************/
struct response_record *queue_refresh_name( struct subnet_record *subrec,
response_function resp_fn,
timeout_response_function timeout_fn,
refresh_name_success_function success_fn,
refresh_name_fail_function fail_fn,
struct userdata_struct *userdata,
struct name_record *namerec,
struct in_addr refresh_ip)
{
struct packet_struct *p;
struct response_record *rrec;
if(assert_check_subnet(subrec))
return NULL;
if(( p = create_and_init_netbios_packet(&namerec->name, (subrec != unicast_subnet), False,
subrec->bcast_ip)) == NULL)
return NULL;
if( !initiate_name_refresh_packet( p, namerec->data.nb_flags, &refresh_ip ) )
{
p->locked = False;
free_packet(p);
return NULL;
}
if((rrec = make_response_record(subrec, /* subnet record. */
p, /* packet we sent. */
resp_fn, /* function to call on response. */
timeout_fn, /* function to call on timeout. */
(success_function)success_fn, /* function to call on operation success. */
(fail_function)fail_fn, /* function to call on operation fail. */
userdata)) == NULL)
{
p->locked = False;
free_packet(p);
return NULL;
}
return rrec;
}
/****************************************************************************
Queue a query name packet to the broadcast address of a subnet.
****************************************************************************/

12
source/nmbd/nmbd_responserecordsdb.c
View File

@ -97,12 +97,12 @@ void remove_response_record(struct subnet_record *subrec,
**************************************************************************/
struct response_record *make_response_record( struct subnet_record *subrec,
struct packet_struct *p,
response_function resp_fn,
timeout_response_function timeout_fn,
success_function success_fn,
fail_function fail_fn,
struct userdata_struct *userdata)
struct packet_struct *p,
response_function resp_fn,
timeout_response_function timeout_fn,
success_function success_fn,
fail_function fail_fn,
struct userdata_struct *userdata)
{
struct response_record *rrec;
struct nmb_packet *nmb = &p->packet.nmb;

58
source/nmbd/nmbd_subnetdb.c
View File

@ -267,45 +267,14 @@ BOOL create_subnets(void)
if (!make_normal_subnet(iface)) return False;
}
/*
* If we have been configured to use a WINS server, then try and
* get the ip address of it here. If we are the WINS server then
* set the unicast subnet address to be the first of our own real
* addresses.
*
* NOTE: I'm not sure of the implications of WINS server failover
* on this bit of code. Because of failover, the WINS
* server address can change. crh
*/
if( wins_srv_count() )
{
struct in_addr real_wins_ip;
real_wins_ip = wins_srv_ip();
if (!is_zero_ip(real_wins_ip))
{
unicast_ip = real_wins_ip;
}
else
{
/* wins_srv_ip() can return a zero IP if all servers are
* either down or incorrectly entered in smb.conf. crh
*/
DEBUG(0,("No 'live' WINS servers found. Check 'wins server' parameter.\n"));
return False;
}
}
else if(lp_we_are_a_wins_server())
{
/* Pick the first interface ip address as the WINS server ip. */
unicast_ip = *iface_n_ip(0);
}
else
{
/* We should not be using a WINS server at all. Set the
ip address of the subnet to be zero. */
zero_ip(&unicast_ip);
if (lp_we_are_a_wins_server()) {
/* Pick the first interface ip address as the WINS server ip. */
unicast_ip = *iface_n_ip(0);
} else {
/* note that we do not set the wins server IP here. We just
set it at zero and let the wins registration code cope
with getting the IPs right for each packet */
zero_ip(&unicast_ip);
}
/*
@ -346,16 +315,13 @@ BOOL create_subnets(void)
/*******************************************************************
Function to tell us if we can use the unicast subnet.
******************************************************************/
BOOL we_are_a_wins_client(void)
{
static int cache_we_are_a_wins_client = -1;
if (wins_srv_count() > 0) {
return True;
}
if(cache_we_are_a_wins_client == -1)
cache_we_are_a_wins_client = (is_zero_ip(unicast_subnet->myip) ?
False : True);
return cache_we_are_a_wins_client;
return False;
}
/*******************************************************************

2
source/nsswitch/winbindd_wins.c
View File

@ -87,7 +87,6 @@ static struct in_addr *lookup_byname_backend(const char *name, int *count)
{
int fd;
struct in_addr *ret = NULL;
struct in_addr p;
int j, flags = 0;
*count = 0;
@ -111,7 +110,6 @@ static struct in_addr *lookup_byname_backend(const char *name, int *count)
if (ret) break;
}
out:
close(fd);
return ret;
}