packet-smb-mailslot.c

   1 /* packet-smb-mailslot.c
   2  * Routines for SMB mailslot packet dissection
   3  * Copyright 2000, Jeffrey C. Foster <jfoste@woodward.com>
   4  *
   5  * $Id: packet-smb-mailslot.c,v 1.33 2002/08/28 21:00:31 jmayer Exp $
   6  *
   7  * Ethereal - Network traffic analyzer
   8  * By Gerald Combs <gerald@ethereal.com>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * Copied from packet-pop.c
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  26  */
  27
  28 #include <string.h>
  29 #include "packet-smb-common.h"
  30 #include "packet-smb-mailslot.h"
  31 #include "packet-smb-browse.h"
  32 #include "packet-smb-logon.h"
  33 #include "packet-smb-pipe.h"
  34
  35 static int proto_smb_msp = -1;
  36 static int hf_opcode = -1;
  37 static int hf_priority = -1;
  38 static int hf_class = -1;
  39 static int hf_size = -1;
  40 static int hf_name = -1;
  41
  42 static int ett_smb_msp = -1;
  43
  44 static dissector_handle_t data_handle;
  45
  46 #define MAILSLOT_UNKNOWN              0
  47 #define MAILSLOT_BROWSE               1
  48 #define MAILSLOT_LANMAN               2
  49 #define MAILSLOT_NET                  3
  50 #define MAILSLOT_TEMP_NETLOGON        4
  51 #define MAILSLOT_MSSP                 5
  52
  53 static const value_string opcode_vals[] = {
  54         {1,     "Write Mail Slot"},
  55         {0,     NULL}
  56 };
  57
  58 static const value_string class_vals[] = {
  59         {1,     "Reliable"},
  60         {2,     "Unreliable & Broadcast"},
  61         {0,     NULL}
  62 };
  63
  64 /* decode the SMB mail slot protocol
  65    for requests
  66      mailslot is the name of the mailslot, e.g. BROWSE
  67      si->trans_subcmd is set to the symbolic constant matching the mailslot name.
  68    for responses
  69      mailslot is NULL
  70      si->trans_subcmd gives us which mailslot this response refers to.
  71 */
  72
  73 gboolean
  74 dissect_mailslot_smb(tvbuff_t *mshdr_tvb, tvbuff_t *setup_tvb,
  75                      tvbuff_t *tvb, const char *mailslot, packet_info *pinfo,
  76                      proto_tree *parent_tree)
  77 {
  78         smb_info_t *smb_info;
  79         smb_transact_info_t *tri;
  80         int             trans_subcmd;
  81         proto_tree      *tree = NULL;
  82         proto_item      *item = NULL;
  83         guint16         opcode;
  84         int             offset = 0;
  85         int             len;
  86         gboolean        dissected;
  87
  88         if (!proto_is_protocol_enabled(proto_smb_msp)) {
  89                 return FALSE;
  90         }
  91         pinfo->current_proto = "SMB Mailslot";
  92
  93         if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
  94                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "SMB Mailslot");
  95         }
  96
  97         if ((tvb==NULL) || (tvb_reported_length(tvb)==0)) {
  98                 /* Interim reply */
  99                 col_set_str(pinfo->cinfo, COL_INFO, "Interim reply");
 100                 return TRUE;
 101         }
 102
 103         if (check_col(pinfo->cinfo, COL_INFO)) {
 104                 col_clear(pinfo->cinfo, COL_INFO);
 105         }
 106
 107         smb_info = pinfo->private_data;
 108         if (smb_info->sip != NULL)
 109                 tri = smb_info->sip->extra_info;
 110         else
 111                 tri = NULL;
 112
 113         /* check which mailslot this is about */
 114         trans_subcmd=MAILSLOT_UNKNOWN;
 115         if(smb_info->request){
 116                 if(strncmp(mailslot,"BROWSE",6) == 0){
 117                         trans_subcmd=MAILSLOT_BROWSE;
 118                 } else if(strncmp(mailslot,"LANMAN",6) == 0){
 119                         trans_subcmd=MAILSLOT_LANMAN;
 120                 } else if(strncmp(mailslot,"NET",3) == 0){
 121                         trans_subcmd=MAILSLOT_NET;
 122                 } else if(strncmp(mailslot,"TEMP\\NETLOGON",13) == 0){
 123                         trans_subcmd=MAILSLOT_TEMP_NETLOGON;
 124                 } else if(strncmp(mailslot,"MSSP",4) == 0){
 125                         trans_subcmd=MAILSLOT_MSSP;
 126                 }
 127                 if (!pinfo->fd->flags.visited) {
 128                         if (tri != NULL)
 129                                 tri->trans_subcmd = trans_subcmd;
 130                 }
 131         } else {
 132                 trans_subcmd = tri->trans_subcmd;
 133         }
 134
 135         /* Only do these ones if we have them. For fragmented SMB Transactions
 136            we may only have the setup area for the first fragment
 137         */
 138         if(mshdr_tvb && setup_tvb){
 139                 if (parent_tree) {
 140                         item = proto_tree_add_item(parent_tree, proto_smb_msp,
 141                                                    mshdr_tvb, 0, -1, FALSE);
 142                         tree = proto_item_add_subtree(item, ett_smb_msp);
 143                 }
 144
 145                 /* do the opcode field */
 146                 opcode = tvb_get_letohs(setup_tvb, offset);
 147
 148                 if (check_col(pinfo->cinfo, COL_INFO)) {
 149                         col_add_str(pinfo->cinfo, COL_INFO,
 150                                     val_to_str(opcode, opcode_vals, "Unknown opcode: 0x%04x"));
 151                 }
 152
 153
 154                 /* These are in the setup words; use "setup_tvb". */
 155
 156                 /* opcode */
 157                 proto_tree_add_uint(tree, hf_opcode, setup_tvb, offset, 2,
 158                     opcode);
 159                 offset += 2;
 160
 161                 /* priority */
 162                 proto_tree_add_item(tree, hf_priority, setup_tvb, offset, 2,
 163                     TRUE);
 164                 offset += 2;
 165
 166                 /* class */
 167                 proto_tree_add_item(tree, hf_class, setup_tvb, offset, 2, TRUE);
 168                 offset += 2;
 169
 170                 /* These are in the rest of the data; use "mshdr_tvb", which
 171                    starts at the same place "setup_tvb" does. */
 172
 173                 /* size */
 174                 /* this is actually bytecount in the SMB Transaction command */
 175                 proto_tree_add_item(tree, hf_size, mshdr_tvb, offset, 2, TRUE);
 176                 offset += 2;
 177
 178                 /* mailslot name */
 179                 len = tvb_strsize(mshdr_tvb, offset);
 180                 proto_tree_add_item(tree, hf_name, mshdr_tvb, offset, len, TRUE);
 181                 offset += len;
 182                 proto_item_set_len(item, offset);
 183         }
 184
 185         dissected = FALSE;
 186         switch(trans_subcmd){
 187         case MAILSLOT_BROWSE:
 188                 dissected = dissect_mailslot_browse(tvb, pinfo, parent_tree);
 189                 break;
 190         case MAILSLOT_LANMAN:
 191                 dissected = dissect_mailslot_lanman(tvb, pinfo, parent_tree);
 192                 break;
 193         case MAILSLOT_NET:
 194         case MAILSLOT_TEMP_NETLOGON:
 195         case MAILSLOT_MSSP:
 196                 dissected = dissect_smb_logon(tvb, pinfo, parent_tree);
 197                 break;
 198         }
 199         if (!dissected) {
 200                 /*
 201                  * We dissected the mailslot header, but not the
 202                  * message; dissect the latter as data, but indicate
 203                  * that we successfully dissected the mailslot stuff.
 204                  */
 205                 call_dissector(data_handle,tvb, pinfo, parent_tree);
 206         }
 207         return TRUE;
 208 }
 209
 210 void
 211 proto_register_smb_mailslot(void)
 212 {
 213         static hf_register_info hf[] = {
 214                 { &hf_opcode,
 215                         { "Opcode", "mailslot.opcode", FT_UINT16, BASE_DEC,
 216                         VALS(opcode_vals), 0, "MAILSLOT OpCode", HFILL }},
 217
 218                 { &hf_priority,
 219                         { "Priority", "mailslot.priority", FT_UINT16, BASE_DEC,
 220                         NULL, 0, "MAILSLOT Priority of transaction", HFILL }},
 221
 222                 { &hf_class,
 223                         { "Class", "mailslot.class", FT_UINT16, BASE_DEC,
 224                         VALS(class_vals), 0, "MAILSLOT Class of transaction", HFILL }},
 225
 226                 { &hf_size,
 227                         { "Size", "mailslot.size", FT_UINT16, BASE_DEC,
 228                         NULL, 0, "MAILSLOT Total size of mail data", HFILL }},
 229
 230                 { &hf_name,
 231                         { "Mailslot Name", "mailslot.name", FT_STRING, BASE_NONE,
 232                         NULL, 0, "MAILSLOT Name of mailslot", HFILL }},
 233
 234         };
 235
 236         static gint *ett[] = {
 237                 &ett_smb_msp
 238         };
 239
 240         proto_smb_msp = proto_register_protocol(
 241                 "SMB MailSlot Protocol", "SMB Mailslot", "mailslot");
 242
 243         proto_register_field_array(proto_smb_msp, hf, array_length(hf));
 244         proto_register_subtree_array(ett, array_length(ett));
 245 }
 246
 247 void
 248 proto_reg_handoff_smb_mailslot(void)
 249 {
 250         data_handle = find_dissector("data");
 251 }