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