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nmbd_responserecordsdb.c

/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   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 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.
   
*/

#include "includes.h"

extern int ClientNMB;

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)
{
  struct response_record *rrec2;

  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));

  if (!subrec->responselist)
  {
    subrec->responselist = rrec;
    rrec->prev = NULL;
    rrec->next = NULL;
    return;
  }
  
  for (rrec2 = subrec->responselist; rrec2->next; rrec2 = rrec2->next) 
    ;
  
  rrec2->next = rrec;
  rrec->next = NULL;
  rrec->prev = rrec2;
}

/***************************************************************************
  Remove an expected response record from the list
  **************************************************************************/

void remove_response_record(struct subnet_record *subrec,
                        struct response_record *rrec)
{
  if (rrec->prev)
    rrec->prev->next = rrec->next;
  if (rrec->next)
    rrec->next->prev = rrec->prev;

  if (subrec->responselist == rrec) 
    subrec->responselist = rrec->next; 

  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 = (struct response_record *)malloc(sizeof(*rrec)))) 
  {
    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 *)
           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 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 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(0,("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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