source/nmbd/nmbd_responserecordsdb.c

   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 2 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, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21
  22 */
  23
  24 #include "includes.h"
  25
  26 extern int ClientNMB;
  27
  28 int num_response_packets = 0;
  29
  30 /***************************************************************************
  31   Add an expected response record into the list
  32   **************************************************************************/
  33
  34 static void add_response_record(struct subnet_record *subrec,
  35                                 struct response_record *rrec)
  36 {
  37   struct response_record *rrec2;
  38
  39   num_response_packets++; /* count of total number of packets still around */
  40
  41   DEBUG(4,("add_response_record: adding response record id:%hu to subnet %s. num_records:%d\n",
  42             rrec->response_id, subrec->subnet_name, num_response_packets));
  43
  44   if (!subrec->responselist)
  45   {
  46     subrec->responselist = rrec;
  47     rrec->prev = NULL;
  48     rrec->next = NULL;
  49     return;
  50   }
  51
  52   for (rrec2 = subrec->responselist; rrec2->next; rrec2 = rrec2->next)
  53     ;
  54
  55   rrec2->next = rrec;
  56   rrec->next = NULL;
  57   rrec->prev = rrec2;
  58 }
  59
  60 /***************************************************************************
  61   Remove an expected response record from the list
  62   **************************************************************************/
  63
  64 void remove_response_record(struct subnet_record *subrec,
  65                                 struct response_record *rrec)
  66 {
  67   if (rrec->prev)
  68     rrec->prev->next = rrec->next;
  69   if (rrec->next)
  70     rrec->next->prev = rrec->prev;
  71
  72   if (subrec->responselist == rrec)
  73     subrec->responselist = rrec->next;
  74
  75   if(rrec->userdata)
  76   {
  77           if(rrec->userdata->free_fn) {
  78                   (*rrec->userdata->free_fn)(rrec->userdata);
  79           } else {
  80                   ZERO_STRUCTP(rrec->userdata);
  81                   SAFE_FREE(rrec->userdata);
  82           }
  83   }
  84
  85   /* Ensure we can delete. */
  86   rrec->packet->locked = False;
  87   free_packet(rrec->packet);
  88
  89   ZERO_STRUCTP(rrec);
  90   SAFE_FREE(rrec);
  91
  92   num_response_packets--; /* count of total number of packets still around */
  93 }
  94
  95 /****************************************************************************
  96   Create a response record for an outgoing packet.
  97   **************************************************************************/
  98
  99 struct response_record *make_response_record( struct subnet_record *subrec,
 100                     struct packet_struct *p,
 101                     response_function resp_fn,
 102                     timeout_response_function timeout_fn,
 103                     success_function success_fn,
 104                     fail_function fail_fn,
 105                     struct userdata_struct *userdata)
 106 {
 107   struct response_record *rrec;
 108   struct nmb_packet *nmb = &p->packet.nmb;
 109
 110   if (!(rrec = (struct response_record *)malloc(sizeof(*rrec))))
 111   {
 112     DEBUG(0,("make_response_queue_record: malloc fail for response_record.\n"));
 113     return NULL;
 114   }
 115
 116   memset((char *)rrec, '\0', sizeof(*rrec));
 117
 118   rrec->response_id = nmb->header.name_trn_id;
 119
 120   rrec->resp_fn = resp_fn;
 121   rrec->timeout_fn = timeout_fn;
 122   rrec->success_fn = success_fn;
 123   rrec->fail_fn = fail_fn;
 124
 125   rrec->packet = p;
 126
 127   if(userdata)
 128   {
 129     /* Intelligent userdata. */
 130     if(userdata->copy_fn)
 131     {
 132       if((rrec->userdata = (*userdata->copy_fn)(userdata)) == NULL)
 133       {
 134         DEBUG(0,("make_response_queue_record: copy fail for userdata.\n"));
 135         ZERO_STRUCTP(rrec);
 136         SAFE_FREE(rrec);
 137         return NULL;
 138       }
 139     }
 140     else
 141     {
 142       /* Primitive userdata, do a memcpy. */
 143       if((rrec->userdata = (struct userdata_struct *)
 144            malloc(sizeof(struct userdata_struct)+userdata->userdata_len)) == NULL)
 145       {
 146         DEBUG(0,("make_response_queue_record: malloc fail for userdata.\n"));
 147         ZERO_STRUCTP(rrec);
 148         SAFE_FREE(rrec);
 149         return NULL;
 150       }
 151       rrec->userdata->copy_fn = userdata->copy_fn;
 152       rrec->userdata->free_fn = userdata->free_fn;
 153       rrec->userdata->userdata_len = userdata->userdata_len;
 154       memcpy(rrec->userdata->data, userdata->data, userdata->userdata_len);
 155     }
 156   }
 157   else
 158     rrec->userdata = NULL;
 159
 160   rrec->num_msgs = 0;
 161
 162   if(!nmb->header.nm_flags.bcast)
 163     rrec->repeat_interval = 5; /* 5 seconds for unicast packets. */
 164   else
 165     rrec->repeat_interval = 1; /* XXXX should be in ms */
 166   rrec->repeat_count = 3; /* 3 retries */
 167   rrec->repeat_time = time(NULL) + rrec->repeat_interval; /* initial retry time */
 168
 169   /* This packet is not being processed. */
 170   rrec->in_expiration_processing = False;
 171
 172   /* Lock the packet so we won't lose it while it's on the list. */
 173   p->locked = True;
 174
 175   add_response_record(subrec, rrec);
 176
 177   return rrec;
 178 }
 179
 180 /****************************************************************************
 181   Find a response in a subnet's name query response list.
 182   **************************************************************************/
 183
 184 static struct response_record *find_response_record_on_subnet(
 185                                 struct subnet_record *subrec, uint16 id)
 186 {
 187   struct response_record *rrec = NULL;
 188
 189   for (rrec = subrec->responselist; rrec; rrec = rrec->next)
 190   {
 191     if (rrec->response_id == id)
 192     {
 193       DEBUG(4, ("find_response_record: found response record id = %hu on subnet %s\n",
 194                id, subrec->subnet_name));
 195       break;
 196     }
 197   }
 198   return rrec;
 199 }
 200
 201 /****************************************************************************
 202   Find a response in any subnet's name query response list.
 203   **************************************************************************/
 204
 205 struct response_record *find_response_record(struct subnet_record **ppsubrec,
 206                                 uint16 id)
 207 {
 208   struct response_record *rrec = NULL;
 209
 210   for ((*ppsubrec) = FIRST_SUBNET; (*ppsubrec);
 211                   (*ppsubrec) = NEXT_SUBNET_INCLUDING_UNICAST(*ppsubrec))
 212   {
 213     if((rrec = find_response_record_on_subnet(*ppsubrec, id)) != NULL)
 214       return rrec;
 215   }
 216
 217   /* There should never be response records on the remote_broadcast subnet.
 218      Sanity check to ensure this is so. */
 219   if(remote_broadcast_subnet->responselist != NULL)
 220   {
 221     DEBUG(0,("find_response_record: response record found on subnet %s. This should \
 222 never happen !\n", remote_broadcast_subnet->subnet_name));
 223   }
 224
 225   /* Now check the WINS server subnet if it exists. */
 226   if(wins_server_subnet != NULL)
 227   {
 228     *ppsubrec = wins_server_subnet;
 229     if((rrec = find_response_record_on_subnet(*ppsubrec, id))!= NULL)
 230       return rrec;
 231   }
 232
 233   DEBUG(0,("find_response_record: response packet id %hu received with no \
 234 matching record.\n", id));
 235
 236   *ppsubrec = NULL;
 237
 238   return NULL;
 239 }
 240
 241 /****************************************************************************
 242   Check if a refresh is queued for a particular name on a particular subnet.
 243   **************************************************************************/
 244
 245 BOOL is_refresh_already_queued(struct subnet_record *subrec, struct name_record *namerec)
 246 {
 247   struct response_record *rrec = NULL;
 248
 249   for (rrec = subrec->responselist; rrec; rrec = rrec->next)
 250   {
 251     struct packet_struct *p = rrec->packet;
 252     struct nmb_packet *nmb = &p->packet.nmb;
 253
 254     if((nmb->header.opcode == NMB_NAME_REFRESH_OPCODE_8) ||
 255        (nmb->header.opcode == NMB_NAME_REFRESH_OPCODE_9))
 256     {
 257       /* Yes it's a queued refresh - check if the name is correct. */
 258       if(nmb_name_equal(&nmb->question.question_name, &namerec->name))
 259         return True;
 260     }
 261   }
 262
 263   return False;
 264 }