source/nmbd/nmbd_nodestatus.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    NBT netbios routines and daemon - version 2
   4    Copyright (C) Andrew Tridgell 1994-1998
   5    Copyright (C) Luke Kenneth Casson Leighton 1994-1998
   6    Copyright (C) Jeremy Allison 1994-2003
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20
  21 */
  22
  23 #include "includes.h"
  24
  25 /****************************************************************************
  26  Deal with a successful node status response.
  27 ****************************************************************************/
  28
  29 static void node_status_response(struct subnet_record *subrec,
  30                        struct response_record *rrec, struct packet_struct *p)
  31 {
  32         struct nmb_packet *nmb = &p->packet.nmb;
  33         struct nmb_name *question_name = &rrec->packet->packet.nmb.question.question_name;
  34         struct nmb_name *answer_name = &nmb->answers->rr_name;
  35
  36         /* Sanity check. Ensure that the answer name in the incoming packet is the
  37                 same as the requested name in the outgoing packet. */
  38
  39         if(!nmb_name_equal(question_name, answer_name)) {
  40                 DEBUG(0,("node_status_response: Answer name %s differs from question \
  41 name %s.\n", nmb_namestr(answer_name), nmb_namestr(question_name)));
  42                 return;
  43         }
  44
  45         DEBUG(5,("node_status_response: response from name %s on subnet %s.\n",
  46                 nmb_namestr(answer_name), subrec->subnet_name));
  47
  48         /* Just send the whole answer resource record for the success function to parse. */
  49         if(rrec->success_fn)
  50                 (*(node_status_success_function)rrec->success_fn)(subrec, rrec->userdata, nmb->answers, p->ip);
  51
  52         /* Ensure we don't retry. */
  53         remove_response_record(subrec, rrec);
  54 }
  55
  56 /****************************************************************************
  57  Deal with a timeout when requesting a node status.
  58 ****************************************************************************/
  59
  60 static void node_status_timeout_response(struct subnet_record *subrec,
  61                        struct response_record *rrec)
  62 {
  63         struct nmb_packet *sent_nmb = &rrec->packet->packet.nmb;
  64         struct nmb_name *question_name = &sent_nmb->question.question_name;
  65
  66         DEBUG(5,("node_status_timeout_response: failed to get node status from name %s on subnet %s\n",
  67                 nmb_namestr(question_name), subrec->subnet_name));
  68
  69         if( rrec->fail_fn)
  70                 (*rrec->fail_fn)(subrec, rrec);
  71
  72         /* Ensure we don't retry. */
  73         remove_response_record(subrec, rrec);
  74 }
  75
  76 /****************************************************************************
  77  Try and do a node status to a name - given the name & IP address.
  78 ****************************************************************************/
  79
  80 bool node_status(struct subnet_record *subrec, struct nmb_name *nmbname,
  81                  struct in_addr send_ip, node_status_success_function success_fn,
  82                  node_status_fail_function fail_fn, struct userdata_struct *userdata)
  83 {
  84         if(queue_node_status( subrec, node_status_response, node_status_timeout_response,
  85                                 success_fn, fail_fn, userdata, nmbname, send_ip)==NULL) {
  86                 DEBUG(0,("node_status: Failed to send packet trying to get node status for \
  87 name %s, IP address %s\n", nmb_namestr(nmbname), inet_ntoa(send_ip)));
  88                 return True;
  89         }
  90         return False;
  91 }