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