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samba-mirror/source3/nmbd/nmbd_subnetdb.c

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/*
Unix SMB/Netbios implementation.
Version 1.9.
NBT netbios routines and daemon - version 2
Copyright (C) Andrew Tridgell 1994-1997
Copyright (C) Luke Kenneth Casson Leighton 1994-1997
Copyright (C) Jeremy Allison 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
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"
#include "smb.h"
extern int ClientNMB;
extern int ClientDGRAM;
extern int global_nmb_port;
extern int DEBUGLEVEL;
extern pstring myname;
extern fstring myworkgroup;
extern char **my_netbios_names;
extern struct in_addr ipzero;
/* 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)
{
struct subnet_record *subrec2;
if (!subnetlist)
{
subnetlist = subrec;
subrec->prev = NULL;
subrec->next = NULL;
return;
}
for (subrec2 = subnetlist; subrec2->next; subrec2 = subrec2->next)
;
subrec2->next = subrec;
subrec->next = NULL;
subrec->prev = subrec2;
}
/****************************************************************************
Create a subnet entry.
****************************************************************************/
static struct subnet_record *make_subnet(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)) == -1)
{
DEBUG(0,("make_subnet: Failed to open nmb socket on interface %s \
for port %d. Error was %s\n", inet_ntoa(myip), global_nmb_port, strerror(errno)));
return NULL;
}
if((dgram_sock = open_socket_in(SOCK_DGRAM,DGRAM_PORT,3, myip.s_addr)) == -1)
{
DEBUG(0,("make_subnet: Failed to open dgram socket on interface %s \
for port %d. Error was %s\n", inet_ntoa(myip), DGRAM_PORT, 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);
}
bzero((char *)subrec,sizeof(*subrec));
if((subrec->subnet_name = strdup(name)) == NULL)
{
DEBUG(0,("make_subnet: malloc fail for subnet name !\n"));
close(nmb_sock);
close(dgram_sock);
free((char *)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 subnet entries.
**************************************************************************/
BOOL create_subnets()
{
int num_interfaces = iface_count();
int i;
struct in_addr unicast_ip;
if(num_interfaces == 0)
{
DEBUG(0,("create_subnets: No local interfaces !\n"));
return False;
}
/*
* Create subnets from all the local interfaces and thread them onto
* the linked list.
*/
for (i = 0 ; i < num_interfaces; i++)
{
struct subnet_record *subrec;
struct interface *iface = get_interface(i);
if((subrec = make_subnet(inet_ntoa(iface->ip), NORMAL_SUBNET,
iface->ip, iface->bcast,iface->nmask)) == NULL)
return False;
add_subnet(subrec);
}
/*
* 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.
*/
if(*lp_wins_server())
{
struct in_addr real_wins_ip;
real_wins_ip = *interpret_addr2(lp_wins_server());
if (!zero_ip(real_wins_ip))
{
unicast_ip = real_wins_ip;
}
else
{
/* The smb.conf's wins server parameter MUST be a host_name
or an ip_address. */
DEBUG(0,("invalid smb.conf parameter 'wins server'\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. */
unicast_ip = ipzero;
}
/*
* 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);
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()
{
static int cache_we_are_a_wins_client = -1;
if(cache_we_are_a_wins_client == -1)
cache_we_are_a_wins_client = (ip_equal(ipzero, unicast_subnet->myip) ?
False : True);
return cache_we_are_a_wins_client;
}
/*******************************************************************
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;
}