Line data    Source code

       1             : /* 
       2             :    Unix SMB/CIFS implementation.
       3             :    NBT netbios library routines
       4             :    Copyright (C) Andrew Tridgell 1994-1998
       5             :    Copyright (C) Luke Kenneth Casson Leighton 1994-1998
       6             :    Copyright (C) Jeremy Allison 1994-1998
       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             : #include "nmbd/nmbd.h"
      25             : 
      26             : int num_response_packets = 0;
      27             : 
      28             : /***************************************************************************
      29             :   Add an expected response record into the list
      30             :   **************************************************************************/
      31             : 
      32         400 : static void add_response_record(struct subnet_record *subrec,
      33             :                                 struct response_record *rrec)
      34             : {
      35         400 :         num_response_packets++; /* count of total number of packets still around */
      36             : 
      37         400 :         DEBUG(4,("add_response_record: adding response record id:%hu to subnet %s. num_records:%d\n",
      38             :                 rrec->response_id, subrec->subnet_name, num_response_packets));
      39             : 
      40         400 :         DLIST_ADD_END(subrec->responselist, rrec);
      41         400 : }
      42             : 
      43             : /***************************************************************************
      44             :   Remove an expected response record from the list
      45             :   **************************************************************************/
      46             : 
      47         398 : void remove_response_record(struct subnet_record *subrec,
      48             :                                 struct response_record *rrec)
      49             : {
      50             :         /* It is possible this can be called twice,
      51             :            with a rrec pointer that has been freed. So
      52             :            before we indirect into rrec, search for it
      53             :            on the responselist first. Bug #3617. JRA. */
      54             : 
      55         398 :         struct response_record *p = NULL;
      56             : 
      57         443 :         for (p = subrec->responselist; p; p = p->next) {
      58         443 :                 if (p == rrec) {
      59         398 :                         break;
      60             :                 }
      61             :         }
      62             : 
      63         398 :         if (p == NULL) {
      64             :                 /* We didn't find rrec on the list. */
      65           0 :                 return;
      66             :         }
      67             : 
      68         398 :         DLIST_REMOVE(subrec->responselist, rrec);
      69             : 
      70         398 :         if(rrec->userdata) {
      71          31 :                 if(rrec->userdata->free_fn) {
      72           0 :                         (*rrec->userdata->free_fn)(rrec->userdata);
      73             :                 } else {
      74          31 :                         ZERO_STRUCTP(rrec->userdata);
      75          31 :                         SAFE_FREE(rrec->userdata);
      76             :                 }
      77             :         }
      78             : 
      79             :         /* Ensure we can delete. */
      80         398 :         rrec->packet->locked = False;
      81         398 :         free_packet(rrec->packet);
      82             : 
      83         398 :         ZERO_STRUCTP(rrec);
      84         398 :         SAFE_FREE(rrec);
      85             : 
      86         398 :         num_response_packets--; /* count of total number of packets still around */
      87             : }
      88             : 
      89             : /****************************************************************************
      90             :   Create a response record for an outgoing packet.
      91             :   **************************************************************************/
      92             : 
      93         400 : struct response_record *make_response_record( struct subnet_record *subrec,
      94             :                                               struct packet_struct *p,
      95             :                                               response_function resp_fn,
      96             :                                               timeout_response_function timeout_fn,
      97             :                                               success_function success_fn,
      98             :                                               fail_function fail_fn,
      99             :                                               struct userdata_struct *userdata)
     100             : {
     101             :         struct response_record *rrec;
     102         400 :         struct nmb_packet *nmb = &p->packet.nmb;
     103             : 
     104         400 :         if (!(rrec = SMB_MALLOC_P(struct response_record))) {
     105           0 :                 DEBUG(0,("make_response_queue_record: malloc fail for response_record.\n"));
     106           0 :                 return NULL;
     107             :         }
     108             : 
     109         400 :         memset((char *)rrec, '\0', sizeof(*rrec));
     110             : 
     111         400 :         rrec->response_id = nmb->header.name_trn_id;
     112             : 
     113         400 :         rrec->resp_fn = resp_fn;
     114         400 :         rrec->timeout_fn = timeout_fn;
     115         400 :         rrec->success_fn = success_fn;
     116         400 :         rrec->fail_fn = fail_fn;
     117             : 
     118         400 :         rrec->packet = p;
     119             : 
     120         400 :         if(userdata) {
     121             :                 /* Intelligent userdata. */
     122          31 :                 if(userdata->copy_fn) {
     123           0 :                         if((rrec->userdata = (*userdata->copy_fn)(userdata)) == NULL) {
     124           0 :                                 DEBUG(0,("make_response_queue_record: copy fail for userdata.\n"));
     125           0 :                                 ZERO_STRUCTP(rrec);
     126           0 :                                 SAFE_FREE(rrec);
     127           0 :                                 return NULL;
     128             :                         }
     129             :                 } else {
     130             :                         /* Primitive userdata, do a memcpy. */
     131          31 :                         if((rrec->userdata = (struct userdata_struct *)
     132          31 :                                         SMB_MALLOC(sizeof(struct userdata_struct)+userdata->userdata_len)) == NULL) {
     133           0 :                                 DEBUG(0,("make_response_queue_record: malloc fail for userdata.\n"));
     134           0 :                                 ZERO_STRUCTP(rrec);
     135           0 :                                 SAFE_FREE(rrec);
     136           0 :                                 return NULL;
     137             :                         }
     138          31 :                         rrec->userdata->copy_fn = userdata->copy_fn;
     139          31 :                         rrec->userdata->free_fn = userdata->free_fn;
     140          31 :                         rrec->userdata->userdata_len = userdata->userdata_len;
     141          31 :                         memcpy(rrec->userdata->data, userdata->data, userdata->userdata_len);
     142             :                 }
     143             :         } else {
     144         369 :                 rrec->userdata = NULL;
     145             :         }
     146             : 
     147         400 :         rrec->num_msgs = 0;
     148             : 
     149         400 :         if(!nmb->header.nm_flags.bcast)
     150           0 :                 rrec->repeat_interval = 5; /* 5 seconds for unicast packets. */
     151             :         else
     152         400 :                 rrec->repeat_interval = 1; /* XXXX should be in ms */
     153         400 :         rrec->repeat_count = 3; /* 3 retries */
     154         400 :         rrec->repeat_time = time(NULL) + rrec->repeat_interval; /* initial retry time */
     155             : 
     156             :         /* This packet is not being processed. */
     157         400 :         rrec->in_expiration_processing = False;
     158             : 
     159             :         /* Lock the packet so we won't lose it while it's on the list. */
     160         400 :         p->locked = True;
     161             : 
     162         400 :         add_response_record(subrec, rrec);
     163             : 
     164         400 :         return rrec;
     165             : }
     166             : 
     167             : /****************************************************************************
     168             :   Find a response in a subnet's name query response list. 
     169             :   **************************************************************************/
     170             : 
     171          49 : static struct response_record *find_response_record_on_subnet(
     172             :                                 struct subnet_record *subrec, uint16_t id)
     173             : {  
     174          49 :         struct response_record *rrec = NULL;
     175             : 
     176         114 :         for (rrec = subrec->responselist; rrec; rrec = rrec->next) {
     177         102 :                 if (rrec->response_id == id) {
     178          37 :                         DEBUG(4, ("find_response_record: found response record id = %hu on subnet %s\n",
     179             :                                 id, subrec->subnet_name));
     180          37 :                         break;
     181             :                 }
     182             :         }
     183          49 :         return rrec;
     184             : }
     185             : 
     186             : /****************************************************************************
     187             :   Find a response in any subnet's name query response list. 
     188             :   **************************************************************************/
     189             : 
     190          49 : struct response_record *find_response_record(struct subnet_record **ppsubrec,
     191             :                                 uint16_t id)
     192             : {  
     193          49 :         struct response_record *rrec = NULL;
     194             : 
     195          61 :         for ((*ppsubrec) = FIRST_SUBNET; (*ppsubrec); 
     196          12 :                                 (*ppsubrec) = NEXT_SUBNET_INCLUDING_UNICAST(*ppsubrec)) {
     197          49 :                 if((rrec = find_response_record_on_subnet(*ppsubrec, id)) != NULL)
     198          37 :                         return rrec;
     199             :         }
     200             : 
     201             :         /* There should never be response records on the remote_broadcast subnet.
     202             :                         Sanity check to ensure this is so. */
     203          12 :         if(remote_broadcast_subnet->responselist != NULL) {
     204           0 :                 DEBUG(0,("find_response_record: response record found on subnet %s. This should \
     205             : never happen !\n", remote_broadcast_subnet->subnet_name));
     206             :         }
     207             : 
     208             :         /* Now check the WINS server subnet if it exists. */
     209          12 :         if(wins_server_subnet != NULL) {
     210           0 :                 *ppsubrec = wins_server_subnet;
     211           0 :                 if((rrec = find_response_record_on_subnet(*ppsubrec, id))!= NULL)
     212           0 :                         return rrec;
     213             :         }
     214             : 
     215          12 :         DEBUG(3,("find_response_record: response packet id %hu received with no \
     216             : matching record.\n", id));
     217             :  
     218          12 :         *ppsubrec = NULL;
     219             : 
     220          12 :         return NULL;
     221             : }
     222             : 
     223             : /****************************************************************************
     224             :   Check if a refresh is queued for a particular name on a particular subnet.
     225             :   **************************************************************************/
     226             :    
     227           0 : bool is_refresh_already_queued(struct subnet_record *subrec, struct name_record *namerec)
     228             : {  
     229           0 :         struct response_record *rrec = NULL;
     230             :    
     231           0 :         for (rrec = subrec->responselist; rrec; rrec = rrec->next) {
     232           0 :                 struct packet_struct *p = rrec->packet;
     233           0 :                 struct nmb_packet *nmb = &p->packet.nmb;
     234             : 
     235           0 :                 if((nmb->header.opcode == NMB_NAME_REFRESH_OPCODE_8) ||
     236           0 :                                 (nmb->header.opcode == NMB_NAME_REFRESH_OPCODE_9)) {
     237             :                         /* Yes it's a queued refresh - check if the name is correct. */
     238           0 :                         if(nmb_name_equal(&nmb->question.question_name, &namerec->name))
     239           0 :                         return True;
     240             :                 }
     241             :         }
     242             : 
     243           0 :         return False;
     244             : }