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Diffstat (limited to 'source4/nmbd/nmbd_subnetdb.c')
-rw-r--r--source4/nmbd/nmbd_subnetdb.c361
1 files changed, 361 insertions, 0 deletions
diff --git a/source4/nmbd/nmbd_subnetdb.c b/source4/nmbd/nmbd_subnetdb.c
new file mode 100644
index 0000000000..6296826425
--- /dev/null
+++ b/source4/nmbd/nmbd_subnetdb.c
@@ -0,0 +1,361 @@
+/*
+ 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 2 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, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ Revision History:
+
+*/
+
+#include "includes.h"
+
+extern int ClientNMB;
+extern int ClientDGRAM;
+extern int global_nmb_port;
+
+/* This is the broadcast subnets database. */
+struct subnet_record *subnetlist = NULL;
+
+/* Extra subnets - keep these separate so enumeration code doesn't
+ run onto it by mistake. */
+
+struct subnet_record *unicast_subnet = NULL;
+struct subnet_record *remote_broadcast_subnet = NULL;
+struct subnet_record *wins_server_subnet = NULL;
+
+extern uint16 samba_nb_type; /* Samba's NetBIOS name type. */
+
+/****************************************************************************
+ Add a subnet into the list.
+ **************************************************************************/
+
+static void add_subnet(struct subnet_record *subrec)
+{
+ DLIST_ADD(subnetlist, subrec);
+}
+
+/* ************************************************************************** **
+ * Comparison routine for ordering the splay-tree based namelists assoicated
+ * with each subnet record.
+ *
+ * Input: Item - Pointer to the comparison key.
+ * Node - Pointer to a node the splay tree.
+ *
+ * Output: The return value will be <0 , ==0, or >0 depending upon the
+ * ordinal relationship of the two keys.
+ *
+ * ************************************************************************** **
+ */
+static int namelist_entry_compare( ubi_trItemPtr Item, ubi_trNodePtr Node )
+ {
+ struct name_record *NR = (struct name_record *)Node;
+
+ if( DEBUGLVL( 10 ) )
+ {
+ struct nmb_name *Iname = (struct nmb_name *)Item;
+
+ Debug1( "nmbd_subnetdb:namelist_entry_compare()\n" );
+ Debug1( "%d == memcmp( \"%s\", \"%s\", %d )\n",
+ memcmp( Item, &(NR->name), sizeof(struct nmb_name) ),
+ nmb_namestr(Iname), nmb_namestr(&NR->name), (int)sizeof(struct nmb_name) );
+ }
+
+ return( memcmp( Item, &(NR->name), sizeof(struct nmb_name) ) );
+ } /* namelist_entry_compare */
+
+
+/****************************************************************************
+stop listening on a subnet
+we don't free the record as we don't have proper reference counting for it
+yet and it may be in use by a response record
+ ****************************************************************************/
+void close_subnet(struct subnet_record *subrec)
+{
+ DLIST_REMOVE(subnetlist, subrec);
+
+ if (subrec->dgram_sock != -1) {
+ close(subrec->dgram_sock);
+ subrec->dgram_sock = -1;
+ }
+ if (subrec->nmb_sock != -1) {
+ close(subrec->nmb_sock);
+ subrec->nmb_sock = -1;
+ }
+}
+
+
+
+/****************************************************************************
+ Create a subnet entry.
+ ****************************************************************************/
+
+static struct subnet_record *make_subnet(const char *name, enum subnet_type type,
+ struct in_addr myip, struct in_addr bcast_ip,
+ struct in_addr mask_ip)
+{
+ struct subnet_record *subrec = NULL;
+ int nmb_sock, dgram_sock;
+
+ /* Check if we are creating a non broadcast subnet - if so don't create
+ sockets.
+ */
+
+ if(type != NORMAL_SUBNET)
+ {
+ nmb_sock = -1;
+ dgram_sock = -1;
+ }
+ else
+ {
+ /*
+ * Attempt to open the sockets on port 137/138 for this interface
+ * and bind them.
+ * Fail the subnet creation if this fails.
+ */
+
+ if((nmb_sock = open_socket_in(SOCK_DGRAM, global_nmb_port,0, myip.s_addr,True)) == -1)
+ {
+ if( DEBUGLVL( 0 ) )
+ {
+ Debug1( "nmbd_subnetdb:make_subnet()\n" );
+ Debug1( " Failed to open nmb socket on interface %s ", inet_ntoa(myip) );
+ Debug1( "for port %d. ", global_nmb_port );
+ Debug1( "Error was %s\n", strerror(errno) );
+ }
+ return NULL;
+ }
+
+ if((dgram_sock = open_socket_in(SOCK_DGRAM,DGRAM_PORT,3, myip.s_addr,True)) == -1)
+ {
+ if( DEBUGLVL( 0 ) )
+ {
+ Debug1( "nmbd_subnetdb:make_subnet()\n" );
+ Debug1( " Failed to open dgram socket on interface %s ", inet_ntoa(myip) );
+ Debug1( "for port %d. ", DGRAM_PORT );
+ Debug1( "Error was %s\n", strerror(errno) );
+ }
+ return NULL;
+ }
+
+ /* Make sure we can broadcast from these sockets. */
+ set_socket_options(nmb_sock,"SO_BROADCAST");
+ set_socket_options(dgram_sock,"SO_BROADCAST");
+
+ }
+
+ subrec = (struct subnet_record *)malloc(sizeof(*subrec));
+
+ if (!subrec)
+ {
+ DEBUG(0,("make_subnet: malloc fail !\n"));
+ close(nmb_sock);
+ close(dgram_sock);
+ return(NULL);
+ }
+
+ memset( (char *)subrec, '\0', sizeof(*subrec) );
+ (void)ubi_trInitTree( subrec->namelist,
+ namelist_entry_compare,
+ ubi_trOVERWRITE );
+
+ if((subrec->subnet_name = strdup(name)) == NULL)
+ {
+ DEBUG(0,("make_subnet: malloc fail for subnet name !\n"));
+ close(nmb_sock);
+ close(dgram_sock);
+ ZERO_STRUCTP(subrec);
+ SAFE_FREE(subrec);
+ return(NULL);
+ }
+
+ DEBUG(2, ("making subnet name:%s ", name ));
+ DEBUG(2, ("Broadcast address:%s ", inet_ntoa(bcast_ip)));
+ DEBUG(2, ("Subnet mask:%s\n", inet_ntoa(mask_ip)));
+
+ subrec->namelist_changed = False;
+ subrec->work_changed = False;
+
+ subrec->bcast_ip = bcast_ip;
+ subrec->mask_ip = mask_ip;
+ subrec->myip = myip;
+ subrec->type = type;
+ subrec->nmb_sock = nmb_sock;
+ subrec->dgram_sock = dgram_sock;
+
+ return subrec;
+}
+
+
+/****************************************************************************
+ Create a normal subnet
+**************************************************************************/
+struct subnet_record *make_normal_subnet(struct interface *iface)
+{
+ struct subnet_record *subrec;
+
+ subrec = make_subnet(inet_ntoa(iface->ip), NORMAL_SUBNET,
+ iface->ip, iface->bcast, iface->nmask);
+ if (subrec) {
+ add_subnet(subrec);
+ }
+ return subrec;
+}
+
+
+/****************************************************************************
+ Create subnet entries.
+**************************************************************************/
+
+BOOL create_subnets(void)
+{
+ int num_interfaces = iface_count();
+ int i;
+ struct in_addr unicast_ip, ipzero;
+ extern struct in_addr loopback_ip;
+
+ if(num_interfaces == 0) {
+ DEBUG(0,("create_subnets: No local interfaces !\n"));
+ DEBUG(0,("create_subnets: Waiting for an interface to appear ...\n"));
+ while (iface_count() == 0) {
+ sleep(5);
+ load_interfaces();
+ }
+ }
+
+ num_interfaces = iface_count();
+
+ /*
+ * Create subnets from all the local interfaces and thread them onto
+ * the linked list.
+ */
+
+ for (i = 0 ; i < num_interfaces; i++)
+ {
+ struct interface *iface = get_interface(i);
+
+ /*
+ * We don't want to add a loopback interface, in case
+ * someone has added 127.0.0.1 for smbd, nmbd needs to
+ * ignore it here. JRA.
+ */
+
+ if (ip_equal(iface->ip, loopback_ip)) {
+ DEBUG(2,("create_subnets: Ignoring loopback interface.\n" ));
+ continue;
+ }
+
+ if (!make_normal_subnet(iface)) return False;
+ }
+
+ 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);
+ }
+
+ /*
+ * Create the unicast and remote broadcast subnets.
+ * Don't put these onto the linked list.
+ * The ip address of the unicast subnet is set to be
+ * the WINS server address, if it exists, or ipzero if not.
+ */
+
+ unicast_subnet = make_subnet( "UNICAST_SUBNET", UNICAST_SUBNET,
+ unicast_ip, unicast_ip, unicast_ip);
+
+ zero_ip(&ipzero);
+
+ remote_broadcast_subnet = make_subnet( "REMOTE_BROADCAST_SUBNET",
+ REMOTE_BROADCAST_SUBNET,
+ ipzero, ipzero, ipzero);
+
+ if((unicast_subnet == NULL) || (remote_broadcast_subnet == NULL))
+ return False;
+
+ /*
+ * If we are WINS server, create the WINS_SERVER_SUBNET - don't put on
+ * the linked list.
+ */
+
+ if (lp_we_are_a_wins_server())
+ {
+ if( (wins_server_subnet = make_subnet( "WINS_SERVER_SUBNET",
+ WINS_SERVER_SUBNET,
+ ipzero, ipzero, ipzero )) == NULL )
+ return False;
+ }
+
+ return True;
+}
+
+/*******************************************************************
+Function to tell us if we can use the unicast subnet.
+******************************************************************/
+BOOL we_are_a_wins_client(void)
+{
+ if (wins_srv_count() > 0) {
+ return True;
+ }
+
+ return False;
+}
+
+/*******************************************************************
+Access function used by NEXT_SUBNET_INCLUDING_UNICAST
+******************************************************************/
+
+struct subnet_record *get_next_subnet_maybe_unicast(struct subnet_record *subrec)
+{
+ if(subrec == unicast_subnet)
+ return NULL;
+ else if((subrec->next == NULL) && we_are_a_wins_client())
+ return unicast_subnet;
+ else
+ return subrec->next;
+}
+
+/*******************************************************************
+ Access function used by retransmit_or_expire_response_records() in
+ nmbd_packets.c. Patch from Andrey Alekseyev <fetch@muffin.arcadia.spb.ru>
+ Needed when we need to enumerate all the broadcast, unicast and
+ WINS subnets.
+******************************************************************/
+
+struct subnet_record *get_next_subnet_maybe_unicast_or_wins_server(struct subnet_record *subrec)
+{
+ if(subrec == unicast_subnet)
+ {
+ if(wins_server_subnet)
+ return wins_server_subnet;
+ else
+ return NULL;
+ }
+
+ if(wins_server_subnet && subrec == wins_server_subnet)
+ return NULL;
+
+ if((subrec->next == NULL) && we_are_a_wins_client())
+ return unicast_subnet;
+ else
+ return subrec->next;
+}
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