source/nmbd/nmbd_nodestatus.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    NBT netbios routines and daemon - version 2
   5    Copyright (C) Andrew Tridgell 1994-1998
   6    Copyright (C) Luke Kenneth Casson Leighton 1994-1998
   7    Copyright (C) Jeremy Allison 1994-1998
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22
  23 */
  24
  25 #include "includes.h"
  26
  27 /****************************************************************************
  28  Deal with a successful node status response.
  29 ****************************************************************************/
  30 static void node_status_response(struct subnet_record *subrec,
  31                        struct response_record *rrec, struct packet_struct *p)
  32 {
  33   struct nmb_packet *nmb = &p->packet.nmb;
  34   struct nmb_name *question_name = &rrec->packet->packet.nmb.question.question_name;
  35   struct nmb_name *answer_name = &nmb->answers->rr_name;
  36
  37   /* Sanity check. Ensure that the answer name in the incoming packet is the
  38      same as the requested name in the outgoing packet. */
  39
  40   if(!nmb_name_equal(question_name, answer_name))
  41   {
  42     DEBUG(0,("node_status_response: Answer name %s differs from question \
  43 name %s.\n", nmb_namestr(answer_name), nmb_namestr(question_name)));
  44     return;
  45   }
  46
  47   DEBUG(5,("node_status_response: response from name %s on subnet %s.\n",
  48         nmb_namestr(answer_name), subrec->subnet_name));
  49
  50   /* Just send the whole answer resource record for the success function
  51      to parse. */
  52   if(rrec->success_fn)
  53     (*(node_status_success_function)rrec->success_fn)(subrec, rrec->userdata, nmb->answers, p->ip);
  54
  55   /* Ensure we don't retry. */
  56   remove_response_record(subrec, rrec);
  57 }
  58
  59 /****************************************************************************
  60  Deal with a timeout when requesting a node status.
  61 ****************************************************************************/
  62 static void node_status_timeout_response(struct subnet_record *subrec,
  63                        struct response_record *rrec)
  64 {
  65   struct nmb_packet *sent_nmb = &rrec->packet->packet.nmb;
  66   struct nmb_name *question_name = &sent_nmb->question.question_name;
  67
  68   DEBUG(5,("node_status_timeout_response: failed to get node status from name %s on subnet %s\n",
  69            nmb_namestr(question_name), subrec->subnet_name));
  70
  71   if( rrec->fail_fn)
  72     (*rrec->fail_fn)(subrec, rrec);
  73
  74   /* Ensure we don't retry. */
  75   remove_response_record(subrec, rrec);
  76 }
  77
  78 /****************************************************************************
  79  Try and do a node status to a name - given the name & IP address.
  80 ****************************************************************************/
  81
  82 BOOL node_status(struct subnet_record *subrec, struct nmb_name *nmbname,
  83                  struct in_addr send_ip, node_status_success_function success_fn,
  84                  node_status_fail_function fail_fn, struct userdata_struct *userdata)
  85 {
  86   if(queue_node_status( subrec,
  87               node_status_response, node_status_timeout_response,
  88               success_fn, fail_fn, userdata, nmbname, send_ip)==NULL)
  89   {
  90     DEBUG(0,("node_status: Failed to send packet trying to get node status for \
  91 name %s, IP address %s\n", nmb_namestr(nmbname), inet_ntoa(send_ip)));
  92     return True;
  93   }
  94   return False;
  95 }