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authorChristopher R. Hertel <crh@samba.org>2001-08-26 06:01:46 +0000
committerChristopher R. Hertel <crh@samba.org>2001-08-26 06:01:46 +0000
commit2ebb098820d83ebab91d90243891e96389867bf3 (patch)
tree61757f557d08b2b097c82fce0197ea1d9af15ff6 /source3/lib/wins_srv.c
parent76f76c957209b762be6ec013d8d0a8adc78a9de3 (diff)
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Small changes to get ready for adding WINS failover to smbd and clients.
My plan is to change the lp_wins_server() function to lp_wins_server_list(). My reason being: With WINS failover the 'wins server' parameter may take a list of WINS server names/IPs instead of just one. If it's a list, then calling lp_wins_server() won't give you what you expect (that is, a single WINS server name or IP). Instead, the functions in wins_srv.c should be used. You can get either the name or IP of the 'current' working WINS server in the list. Chris -)----- (This used to be commit efaa9ef5e72c3748d97e43bba38a0ba47ff3438d)
Diffstat (limited to 'source3/lib/wins_srv.c')
-rw-r--r--source3/lib/wins_srv.c81
1 files changed, 76 insertions, 5 deletions
diff --git a/source3/lib/wins_srv.c b/source3/lib/wins_srv.c
index 4f9922474e..e6c0c51608 100644
--- a/source3/lib/wins_srv.c
+++ b/source3/lib/wins_srv.c
@@ -89,7 +89,7 @@
typedef struct
{
ubi_slNode node; /* Linked list node structure. */
- time_t mourning; /* If > current time then server is dead, Jim. */
+ time_t mourning; /* If > current time then server is dead, Jim. */
char *server; /* DNS name or IP of NBNS server to query. */
struct in_addr ip_addr; /* Cache translated IP. */
} list_entry;
@@ -120,6 +120,7 @@ BOOL wins_srv_load_list( char *src )
* to the ip_addr field of the entry. Don't bother to to a host
* name lookup on all names now. They're done as needed in
* wins_srv_ip().
+ * ------------------------------------------------------------------------ **
*/
{
list_entry *entry;
@@ -148,14 +149,24 @@ BOOL wins_srv_load_list( char *src )
else
{
entry->mourning = 0;
+ /* Create a copy of the server name and store it in the list. */
if( NULL == (entry->server = strdup( wins_id_bufr )) )
{
free( entry );
- DEBUG( 0, ("wins_srv_load_list(): strdup(\"%s\") failed.\n", wins_id_bufr) );
+ DEBUG( 0,
+ ("wins_srv_load_list(): strdup(\"%s\") failed.\n", wins_id_bufr) );
}
else
{
- /* Add server to list. */
+ /* Add server to list.
+ * If the server name was actually an IP address we will store that
+ * too. It it was a DNS name, we will wait until we need to use
+ * the WINS server before doing the DNS lookup. Since this may be
+ * a list, and since we will reload the list whenever smb.conf is
+ * reloaded, there's no point in trying to look up names until we
+ * need them. ...of course, once we do the lookup we will cache
+ * the result. See wins_srv_ip().
+ */
if( is_ipaddress( wins_id_bufr ) )
entry->ip_addr = *interpret_addr2( wins_id_bufr );
else
@@ -167,7 +178,8 @@ BOOL wins_srv_load_list( char *src )
}
count = ubi_slCount( wins_srv_list );
- DEBUGADD( 4, ( "%d WINS server%s listed.\n", (int)count, (1==count)?"":"s" ) );
+ DEBUGADD( 4,
+ ( "%d WINS server%s listed.\n", (int)count, (1==count)?"":"s" ) );
return( (count > 0) ? True : False );
} /* wins_srv_load_list */
@@ -175,6 +187,19 @@ BOOL wins_srv_load_list( char *src )
struct in_addr wins_srv_ip( void )
/* ------------------------------------------------------------------------ **
+ * Return the IP address of an NBNS (WINS) server thought to be active.
+ *
+ * Input: none.
+ *
+ * Output: An IP address in struct in_addr form.
+ *
+ * Notes: This function will return the IP address of the first available
+ * NBNS (WINS) server. The order of the list is determined in
+ * smb.conf. If all of the WINS servers have been marked 'dead'
+ * then the zero IP (0.0.0.0) is returned. The zero IP is not a
+ * valid Unicast address on any system.
+ *
+ * ------------------------------------------------------------------------ **
*/
{
time_t now = time(NULL);
@@ -202,16 +227,61 @@ struct in_addr wins_srv_ip( void )
} /* wins_srv_ip */
+char *wins_srv_name( void )
+ /* ------------------------------------------------------------------------ **
+ * Return the name of first live WINS server in the list.
+ *
+ * Input: none.
+ *
+ * Output: A pointer to a string containing either the DNS name or IP
+ * address of the WINS server as given in the WINS SERVER
+ * parameter in smb.conf, or NULL if no (live) WINS servers are
+ * in the list.
+ *
+ * Notes: This function will return the name of the first available
+ * NBNS (WINS) server. The order of the list is determined in
+ * smb.conf. If all of the WINS servers have been marked 'dead'
+ * then NULL is returned.
+ *
+ * - This function does not verify that the name can be mapped to
+ * an IP address, or that the WINS server is running.
+ *
+ * ------------------------------------------------------------------------ **
+ */
+ {
+ time_t now = time(NULL);
+ list_entry *entry = (list_entry *)ubi_slFirst( wins_srv_list );
+
+ while( NULL != entry )
+ {
+ if( now >= entry->mourning )
+ return( entry->server ); /* Found a live one. */
+ entry = (list_entry *)ubi_slNext( entry );
+ }
+
+ /* If there are no live entries, return NULL. */
+ return( NULL );
+ } /* wins_srv_name */
+
+
void wins_srv_died( struct in_addr boothill_ip )
/* ------------------------------------------------------------------------ **
* Called to indicate that a specific WINS server has died.
+ *
+ * Input: boothill_ip - IP address of an NBNS (WINS) server that has
+ * failed.
+ *
+ * Notes: This function marks the record 'dead' for NECROMANCYCLE
+ * seconds.
+ *
+ * ------------------------------------------------------------------------ **
*/
{
list_entry *entry;
if( zero_ip( boothill_ip ) )
{
- DEBUG( 4, ("wins_srv_died(): Got request to mark zero IP down.\n") );
+ DEBUG( 4, ("wins_srv_died(): Invalid request to mark zero IP down.\n") );
return;
}
@@ -242,6 +312,7 @@ void wins_srv_died( struct in_addr boothill_ip )
unsigned long wins_srv_count( void )
/* ------------------------------------------------------------------------ **
* Return the total number of entries in the list, dead or alive.
+ * ------------------------------------------------------------------------ **
*/
{
unsigned long count = ubi_slCount( wins_srv_list );