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Unix SMB/CIFS implementation.
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NBT netbios library routines
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Copyright (C) Andrew Tridgell 1994-1998
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Copyright (C) Luke Kenneth Casson Leighton 1994-1998
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Copyright (C) Jeremy Allison 1994-1998
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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int num_response_packets = 0;
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/***************************************************************************
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Add an expected response record into the list
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**************************************************************************/
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static void add_response_record(struct subnet_record *subrec,
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struct response_record *rrec)
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num_response_packets++; /* count of total number of packets still around */
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DEBUG(4,("add_response_record: adding response record id:%hu to subnet %s. num_records:%d\n",
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rrec->response_id, subrec->subnet_name, num_response_packets));
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DLIST_ADD_END(subrec->responselist, rrec, struct response_record *);
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/***************************************************************************
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Remove an expected response record from the list
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**************************************************************************/
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void remove_response_record(struct subnet_record *subrec,
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struct response_record *rrec)
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/* It is possible this can be called twice,
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with a rrec pointer that has been freed. So
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before we inderect into rrec, search for it
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on the responselist first. Bug #3617. JRA. */
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struct response_record *p = NULL;
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for (p = subrec->responselist; p; p = p->next) {
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/* We didn't find rrec on the list. */
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DLIST_REMOVE(subrec->responselist, rrec);
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if(rrec->userdata->free_fn) {
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(*rrec->userdata->free_fn)(rrec->userdata);
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ZERO_STRUCTP(rrec->userdata);
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SAFE_FREE(rrec->userdata);
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/* Ensure we can delete. */
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rrec->packet->locked = False;
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free_packet(rrec->packet);
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num_response_packets--; /* count of total number of packets still around */
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/****************************************************************************
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Create a response record for an outgoing packet.
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**************************************************************************/
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struct response_record *make_response_record( struct subnet_record *subrec,
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struct packet_struct *p,
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response_function resp_fn,
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timeout_response_function timeout_fn,
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success_function success_fn,
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fail_function fail_fn,
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struct userdata_struct *userdata)
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struct response_record *rrec;
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struct nmb_packet *nmb = &p->packet.nmb;
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if (!(rrec = SMB_MALLOC_P(struct response_record))) {
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DEBUG(0,("make_response_queue_record: malloc fail for response_record.\n"));
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memset((char *)rrec, '\0', sizeof(*rrec));
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rrec->response_id = nmb->header.name_trn_id;
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rrec->resp_fn = resp_fn;
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rrec->timeout_fn = timeout_fn;
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rrec->success_fn = success_fn;
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rrec->fail_fn = fail_fn;
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/* Intelligent userdata. */
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if(userdata->copy_fn) {
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if((rrec->userdata = (*userdata->copy_fn)(userdata)) == NULL) {
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DEBUG(0,("make_response_queue_record: copy fail for userdata.\n"));
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/* Primitive userdata, do a memcpy. */
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if((rrec->userdata = (struct userdata_struct *)
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SMB_MALLOC(sizeof(struct userdata_struct)+userdata->userdata_len)) == NULL) {
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DEBUG(0,("make_response_queue_record: malloc fail for userdata.\n"));
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rrec->userdata->copy_fn = userdata->copy_fn;
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rrec->userdata->free_fn = userdata->free_fn;
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rrec->userdata->userdata_len = userdata->userdata_len;
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memcpy(rrec->userdata->data, userdata->data, userdata->userdata_len);
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rrec->userdata = NULL;
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if(!nmb->header.nm_flags.bcast)
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rrec->repeat_interval = 5; /* 5 seconds for unicast packets. */
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rrec->repeat_interval = 1; /* XXXX should be in ms */
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rrec->repeat_count = 3; /* 3 retries */
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rrec->repeat_time = time(NULL) + rrec->repeat_interval; /* initial retry time */
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/* This packet is not being processed. */
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rrec->in_expiration_processing = False;
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/* Lock the packet so we won't lose it while it's on the list. */
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add_response_record(subrec, rrec);
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/****************************************************************************
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Find a response in a subnet's name query response list.
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**************************************************************************/
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static struct response_record *find_response_record_on_subnet(
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struct subnet_record *subrec, uint16 id)
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struct response_record *rrec = NULL;
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for (rrec = subrec->responselist; rrec; rrec = rrec->next) {
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if (rrec->response_id == id) {
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DEBUG(4, ("find_response_record: found response record id = %hu on subnet %s\n",
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id, subrec->subnet_name));
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/****************************************************************************
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Find a response in any subnet's name query response list.
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**************************************************************************/
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struct response_record *find_response_record(struct subnet_record **ppsubrec,
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struct response_record *rrec = NULL;
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for ((*ppsubrec) = FIRST_SUBNET; (*ppsubrec);
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(*ppsubrec) = NEXT_SUBNET_INCLUDING_UNICAST(*ppsubrec)) {
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if((rrec = find_response_record_on_subnet(*ppsubrec, id)) != NULL)
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/* There should never be response records on the remote_broadcast subnet.
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Sanity check to ensure this is so. */
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if(remote_broadcast_subnet->responselist != NULL) {
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DEBUG(0,("find_response_record: response record found on subnet %s. This should \
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never happen !\n", remote_broadcast_subnet->subnet_name));
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/* Now check the WINS server subnet if it exists. */
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if(wins_server_subnet != NULL) {
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*ppsubrec = wins_server_subnet;
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if((rrec = find_response_record_on_subnet(*ppsubrec, id))!= NULL)
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DEBUG(3,("find_response_record: response packet id %hu received with no \
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matching record.\n", id));
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/****************************************************************************
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Check if a refresh is queued for a particular name on a particular subnet.
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**************************************************************************/
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bool is_refresh_already_queued(struct subnet_record *subrec, struct name_record *namerec)
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struct response_record *rrec = NULL;
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for (rrec = subrec->responselist; rrec; rrec = rrec->next) {
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struct packet_struct *p = rrec->packet;
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struct nmb_packet *nmb = &p->packet.nmb;
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if((nmb->header.opcode == NMB_NAME_REFRESH_OPCODE_8) ||
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(nmb->header.opcode == NMB_NAME_REFRESH_OPCODE_9)) {
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/* Yes it's a queued refresh - check if the name is correct. */
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if(nmb_name_equal(&nmb->question.question_name, &namerec->name))