source/nmbd/nmbd_responserecordsdb.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    NBT netbios library routines
   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 extern int ClientNMB;
  28
  29 extern int DEBUGLEVEL;
  30
  31 extern struct in_addr ipzero;
  32
  33 int num_response_packets = 0;
  34
  35 /***************************************************************************
  36   Add an expected response record into the list
  37   **************************************************************************/
  38
  39 static void add_response_record(struct subnet_record *subrec,
  40                                 struct response_record *rrec)
  41 {
  42   struct response_record *rrec2;
  43
  44   num_response_packets++; /* count of total number of packets still around */
  45
  46   DEBUG(4,("add_response_record: adding response record id:%hu to subnet %s. num_records:%d\n",
  47             rrec->response_id, subrec->subnet_name, num_response_packets));
  48
  49   if (!subrec->responselist)
  50   {
  51     subrec->responselist = rrec;
  52     rrec->prev = NULL;
  53     rrec->next = NULL;
  54     return;
  55   }
  56
  57   for (rrec2 = subrec->responselist; rrec2->next; rrec2 = rrec2->next)
  58     ;
  59
  60   rrec2->next = rrec;
  61   rrec->next = NULL;
  62   rrec->prev = rrec2;
  63 }
  64
  65 /***************************************************************************
  66   Remove an expected response record from the list
  67   **************************************************************************/
  68
  69 void remove_response_record(struct subnet_record *subrec,
  70                                 struct response_record *rrec)
  71 {
  72   if (rrec->prev)
  73     rrec->prev->next = rrec->next;
  74   if (rrec->next)
  75     rrec->next->prev = rrec->prev;
  76
  77   if (subrec->responselist == rrec)
  78     subrec->responselist = rrec->next;
  79
  80   if(rrec->userdata)
  81   {
  82           if(rrec->userdata->free_fn) {
  83                   (*rrec->userdata->free_fn)(rrec->userdata);
  84           } else {
  85                   ZERO_STRUCTP(rrec->userdata);
  86                   free((char *)rrec->userdata);
  87           }
  88   }
  89
  90   /* Ensure we can delete. */
  91   rrec->packet->locked = False;
  92   free_packet(rrec->packet);
  93
  94   ZERO_STRUCTP(rrec);
  95   free((char *)rrec);
  96
  97   num_response_packets--; /* count of total number of packets still around */
  98 }
  99
 100 /****************************************************************************
 101   Create a response record for an outgoing packet.
 102   **************************************************************************/
 103
 104 struct response_record *make_response_record( struct subnet_record *subrec,
 105                     struct packet_struct *p,
 106                     response_function resp_fn,
 107                     timeout_response_function timeout_fn,
 108                     success_function success_fn,
 109                     fail_function fail_fn,
 110                     struct userdata_struct *userdata)
 111 {
 112   struct response_record *rrec;
 113   struct nmb_packet *nmb = &p->packet.nmb;
 114
 115   if (!(rrec = (struct response_record *)malloc(sizeof(*rrec))))
 116   {
 117     DEBUG(0,("make_response_queue_record: malloc fail for response_record.\n"));
 118     return NULL;
 119   }
 120
 121   memset((char *)rrec, '\0', sizeof(*rrec));
 122
 123   rrec->response_id = nmb->header.name_trn_id;
 124
 125   rrec->resp_fn = resp_fn;
 126   rrec->timeout_fn = timeout_fn;
 127   rrec->success_fn = success_fn;
 128   rrec->fail_fn = fail_fn;
 129
 130   rrec->packet = p;
 131
 132   if(userdata)
 133   {
 134     /* Intelligent userdata. */
 135     if(userdata->copy_fn)
 136     {
 137       if((rrec->userdata = (*userdata->copy_fn)(userdata)) == NULL)
 138       {
 139         DEBUG(0,("make_response_queue_record: copy fail for userdata.\n"));
 140         ZERO_STRUCTP(rrec);
 141         free(rrec);
 142         return NULL;
 143       }
 144     }
 145     else
 146     {
 147       /* Primitive userdata, do a memcpy. */
 148       if((rrec->userdata = (struct userdata_struct *)
 149            malloc(sizeof(struct userdata_struct)+userdata->userdata_len)) == NULL)
 150       {
 151         DEBUG(0,("make_response_queue_record: malloc fail for userdata.\n"));
 152         ZERO_STRUCTP(rrec);
 153         free(rrec);
 154         return NULL;
 155       }
 156       rrec->userdata->copy_fn = userdata->copy_fn;
 157       rrec->userdata->free_fn = userdata->free_fn;
 158       rrec->userdata->userdata_len = userdata->userdata_len;
 159       memcpy(rrec->userdata->data, userdata->data, userdata->userdata_len);
 160     }
 161   }
 162   else
 163     rrec->userdata = NULL;
 164
 165   rrec->num_msgs = 0;
 166
 167   if(!nmb->header.nm_flags.bcast)
 168     rrec->repeat_interval = 5; /* 5 seconds for unicast packets. */
 169   else
 170     rrec->repeat_interval = 1; /* XXXX should be in ms */
 171   rrec->repeat_count = 3; /* 3 retries */
 172   rrec->repeat_time = time(NULL) + rrec->repeat_interval; /* initial retry time */
 173
 174   /* This packet is not being processed. */
 175   rrec->in_expiration_processing = False;
 176
 177   /* Lock the packet so we won't lose it while it's on the list. */
 178   p->locked = True;
 179
 180   add_response_record(subrec, rrec);
 181
 182   return rrec;
 183 }
 184
 185 /****************************************************************************
 186   Find a response in a subnet's name query response list.
 187   **************************************************************************/
 188
 189 static struct response_record *find_response_record_on_subnet(
 190                                 struct subnet_record *subrec, uint16 id)
 191 {
 192   struct response_record *rrec = NULL;
 193
 194   for (rrec = subrec->responselist; rrec; rrec = rrec->next)
 195   {
 196     if (rrec->response_id == id)
 197     {
 198       DEBUG(4, ("find_response_record: found response record id = %hu on subnet %s\n",
 199                id, subrec->subnet_name));
 200       break;
 201     }
 202   }
 203   return rrec;
 204 }
 205
 206 /****************************************************************************
 207   Find a response in any subnet's name query response list.
 208   **************************************************************************/
 209
 210 struct response_record *find_response_record(struct subnet_record **ppsubrec,
 211                                 uint16 id)
 212 {
 213   struct response_record *rrec = NULL;
 214
 215   for ((*ppsubrec) = FIRST_SUBNET; (*ppsubrec);
 216                   (*ppsubrec) = NEXT_SUBNET_INCLUDING_UNICAST(*ppsubrec))
 217   {
 218     if((rrec = find_response_record_on_subnet(*ppsubrec, id)) != NULL)
 219       return rrec;
 220   }
 221
 222   /* There should never be response records on the remote_broadcast subnet.
 223      Sanity check to ensure this is so. */
 224   if(remote_broadcast_subnet->responselist != NULL)
 225   {
 226     DEBUG(0,("find_response_record: response record found on subnet %s. This should \
 227 never happen !\n", remote_broadcast_subnet->subnet_name));
 228   }
 229
 230   /* Now check the WINS server subnet if it exists. */
 231   if(wins_server_subnet != NULL)
 232   {
 233     *ppsubrec = wins_server_subnet;
 234     if((rrec = find_response_record_on_subnet(*ppsubrec, id))!= NULL)
 235       return rrec;
 236   }
 237
 238   DEBUG(0,("find_response_record: response packet id %hu received with no \
 239 matching record.\n", id));
 240
 241   *ppsubrec = NULL;
 242
 243   return NULL;
 244 }
 245
 246 /****************************************************************************
 247   Check if a refresh is queued for a particular name on a particular subnet.
 248   **************************************************************************/
 249
 250 BOOL is_refresh_already_queued(struct subnet_record *subrec, struct name_record *namerec)
 251 {
 252   struct response_record *rrec = NULL;
 253
 254   for (rrec = subrec->responselist; rrec; rrec = rrec->next)
 255   {
 256     struct packet_struct *p = rrec->packet;
 257     struct nmb_packet *nmb = &p->packet.nmb;
 258
 259     if((nmb->header.opcode == NMB_NAME_REFRESH_OPCODE_8) ||
 260        (nmb->header.opcode == NMB_NAME_REFRESH_OPCODE_9))
 261     {
 262       /* Yes it's a queued refresh - check if the name is correct. */
 263       if(nmb_name_equal(&nmb->question.question_name, &namerec->name))
 264         return True;
 265     }
 266   }
 267
 268   return False;
 269 }