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/*
Unix SMB/CIFS implementation.
NBT netbios library routines
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "nmbd/nmbd.h"
int num_response_packets = 0;
/***************************************************************************
Add an expected response record into the list
**************************************************************************/
static void add_response_record(struct subnet_record *subrec,
struct response_record *rrec)
{
num_response_packets++; /* count of total number of packets still around */
DEBUG(4,("add_response_record: adding response record id:%hu to subnet %s. num_records:%d\n",
rrec->response_id, subrec->subnet_name, num_response_packets));
DLIST_ADD_END(subrec->responselist, rrec);
}
/***************************************************************************
Remove an expected response record from the list
**************************************************************************/
void remove_response_record(struct subnet_record *subrec,
struct response_record *rrec)
{
/* It is possible this can be called twice,
with a rrec pointer that has been freed. So
before we indirect into rrec, search for it
on the responselist first. Bug #3617. JRA. */
struct response_record *p = NULL;
for (p = subrec->responselist; p; p = p->next) {
if (p == rrec) {
break;
}
}
if (p == NULL) {
/* We didn't find rrec on the list. */
return;
}
DLIST_REMOVE(subrec->responselist, rrec);
if(rrec->userdata) {
if(rrec->userdata->free_fn) {
(*rrec->userdata->free_fn)(rrec->userdata);
} else {
ZERO_STRUCTP(rrec->userdata);
SAFE_FREE(rrec->userdata);
}
}
/* Ensure we can delete. */
rrec->packet->locked = False;
free_packet(rrec->packet);
ZERO_STRUCTP(rrec);
SAFE_FREE(rrec);
num_response_packets--; /* count of total number of packets still around */
}
/****************************************************************************
Create a response record for an outgoing packet.
**************************************************************************/
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 response_record *rrec;
struct nmb_packet *nmb = &p->packet.nmb;
if (!(rrec = SMB_MALLOC_P(struct response_record))) {
DEBUG(0,("make_response_queue_record: malloc fail for response_record.\n"));
return NULL;
}
memset((char *)rrec, '\0', sizeof(*rrec));
rrec->response_id = nmb->header.name_trn_id;
rrec->resp_fn = resp_fn;
rrec->timeout_fn = timeout_fn;
rrec->success_fn = success_fn;
rrec->fail_fn = fail_fn;
rrec->packet = p;
if(userdata) {
/* Intelligent userdata. */
if(userdata->copy_fn) {
if((rrec->userdata = (*userdata->copy_fn)(userdata)) == NULL) {
DEBUG(0,("make_response_queue_record: copy fail for userdata.\n"));
ZERO_STRUCTP(rrec);
SAFE_FREE(rrec);
return NULL;
}
} else {
/* Primitive userdata, do a memcpy. */
if((rrec->userdata = (struct userdata_struct *)
SMB_MALLOC(sizeof(struct userdata_struct)+userdata->userdata_len)) == NULL) {
DEBUG(0,("make_response_queue_record: malloc fail for userdata.\n"));
ZERO_STRUCTP(rrec);
SAFE_FREE(rrec);
return NULL;
}
rrec->userdata->copy_fn = userdata->copy_fn;
rrec->userdata->free_fn = userdata->free_fn;
rrec->userdata->userdata_len = userdata->userdata_len;
memcpy(rrec->userdata->data, userdata->data, userdata->userdata_len);
}
} else {
rrec->userdata = NULL;
}
rrec->num_msgs = 0;
if(!nmb->header.nm_flags.bcast)
rrec->repeat_interval = 5; /* 5 seconds for unicast packets. */
else
rrec->repeat_interval = 1; /* XXXX should be in ms */
rrec->repeat_count = 3; /* 3 retries */
rrec->repeat_time = time(NULL) + rrec->repeat_interval; /* initial retry time */
/* This packet is not being processed. */
rrec->in_expiration_processing = False;
/* Lock the packet so we won't lose it while it's on the list. */
p->locked = True;
add_response_record(subrec, rrec);
return rrec;
}
/****************************************************************************
Find a response in a subnet's name query response list.
**************************************************************************/
static struct response_record *find_response_record_on_subnet(
struct subnet_record *subrec, uint16_t id)
{
struct response_record *rrec = NULL;
for (rrec = subrec->responselist; rrec; rrec = rrec->next) {
if (rrec->response_id == id) {
DEBUG(4, ("find_response_record: found response record id = %hu on subnet %s\n",
id, subrec->subnet_name));
break;
}
}
return rrec;
}
/****************************************************************************
Find a response in any subnet's name query response list.
**************************************************************************/
struct response_record *find_response_record(struct subnet_record **ppsubrec,
uint16_t id)
{
struct response_record *rrec = NULL;
for ((*ppsubrec) = FIRST_SUBNET; (*ppsubrec);
(*ppsubrec) = NEXT_SUBNET_INCLUDING_UNICAST(*ppsubrec)) {
if((rrec = find_response_record_on_subnet(*ppsubrec, id)) != NULL)
return rrec;
}
/* There should never be response records on the remote_broadcast subnet.
Sanity check to ensure this is so. */
if(remote_broadcast_subnet->responselist != NULL) {
DEBUG(0,("find_response_record: response record found on subnet %s. This should \
never happen !\n", remote_broadcast_subnet->subnet_name));
}
/* Now check the WINS server subnet if it exists. */
if(wins_server_subnet != NULL) {
*ppsubrec = wins_server_subnet;
if((rrec = find_response_record_on_subnet(*ppsubrec, id))!= NULL)
return rrec;
}
DEBUG(3,("find_response_record: response packet id %hu received with no \
matching record.\n", id));
*ppsubrec = NULL;
return NULL;
}
/****************************************************************************
Check if a refresh is queued for a particular name on a particular subnet.
**************************************************************************/
bool is_refresh_already_queued(struct subnet_record *subrec, struct name_record *namerec)
{
struct response_record *rrec = NULL;
for (rrec = subrec->responselist; rrec; rrec = rrec->next) {
struct packet_struct *p = rrec->packet;
struct nmb_packet *nmb = &p->packet.nmb;
if((nmb->header.opcode == NMB_NAME_REFRESH_OPCODE_8) ||
(nmb->header.opcode == NMB_NAME_REFRESH_OPCODE_9)) {
/* Yes it's a queued refresh - check if the name is correct. */
if(nmb_name_equal(&nmb->question.question_name, &namerec->name))
return True;
}
}
return False;
}
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