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 1.35 2003/11/19 03:53:33 guy 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-pipe.h"
  33
  34 static int proto_smb_msp = -1;
  35 static int hf_opcode = -1;
  36 static int hf_priority = -1;
  37 static int hf_class = -1;
  38 static int hf_size = -1;
  39 static int hf_name = -1;
  40
  41 static int ett_smb_msp = -1;
  42
  43 static dissector_handle_t mailslot_browse_handle;
  44 static dissector_handle_t mailslot_lanman_handle;
  45 static dissector_handle_t netlogon_handle;
  46 static dissector_handle_t data_handle;
  47
  48 #define MAILSLOT_UNKNOWN              0
  49 #define MAILSLOT_BROWSE               1
  50 #define MAILSLOT_LANMAN               2
  51 #define MAILSLOT_NET                  3
  52 #define MAILSLOT_TEMP_NETLOGON        4
  53 #define MAILSLOT_MSSP                 5
  54
  55 static const value_string opcode_vals[] = {
  56         {1,     "Write Mail Slot"},
  57         {0,     NULL}
  58 };
  59
  60 static const value_string class_vals[] = {
  61         {1,     "Reliable"},
  62         {2,     "Unreliable & Broadcast"},
  63         {0,     NULL}
  64 };
  65
  66 /* decode the SMB mail slot protocol
  67    for requests
  68      mailslot is the name of the mailslot, e.g. BROWSE
  69      si->trans_subcmd is set to the symbolic constant matching the mailslot name.
  70    for responses
  71      mailslot is NULL
  72      si->trans_subcmd gives us which mailslot this response refers to.
  73 */
  74
  75 gboolean
  76 dissect_mailslot_smb(tvbuff_t *mshdr_tvb, tvbuff_t *setup_tvb,
  77                      tvbuff_t *tvb, const char *mailslot, packet_info *pinfo,
  78                      proto_tree *parent_tree)
  79 {
  80         smb_info_t *smb_info;
  81         smb_transact_info_t *tri;
  82         int             trans_subcmd;
  83         proto_tree      *tree = NULL;
  84         proto_item      *item = NULL;
  85         guint16         opcode;
  86         int             offset = 0;
  87         int             len;
  88
  89         if (!proto_is_protocol_enabled(find_protocol_by_id(proto_smb_msp))) {
  90                 return FALSE;
  91         }
  92         pinfo->current_proto = "SMB Mailslot";
  93
  94         if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
  95                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "SMB Mailslot");
  96         }
  97
  98         if ((tvb==NULL) || (tvb_reported_length(tvb)==0)) {
  99                 /* Interim reply */
 100                 col_set_str(pinfo->cinfo, COL_INFO, "Interim reply");
 101                 return TRUE;
 102         }
 103
 104         if (check_col(pinfo->cinfo, COL_INFO)) {
 105                 col_clear(pinfo->cinfo, COL_INFO);
 106         }
 107
 108         smb_info = pinfo->private_data;
 109         if (smb_info->sip != NULL)
 110                 tri = smb_info->sip->extra_info;
 111         else
 112                 tri = NULL;
 113
 114         /* check which mailslot this is about */
 115         trans_subcmd=MAILSLOT_UNKNOWN;
 116         if(smb_info->request){
 117                 if(strncmp(mailslot,"BROWSE",6) == 0){
 118                         trans_subcmd=MAILSLOT_BROWSE;
 119                 } else if(strncmp(mailslot,"LANMAN",6) == 0){
 120                         trans_subcmd=MAILSLOT_LANMAN;
 121                 } else if(strncmp(mailslot,"NET",3) == 0){
 122                         trans_subcmd=MAILSLOT_NET;
 123                 } else if(strncmp(mailslot,"TEMP\\NETLOGON",13) == 0){
 124                         trans_subcmd=MAILSLOT_TEMP_NETLOGON;
 125                 } else if(strncmp(mailslot,"MSSP",4) == 0){
 126                         trans_subcmd=MAILSLOT_MSSP;
 127                 }
 128                 if (!pinfo->fd->flags.visited) {
 129                         if (tri != NULL)
 130                                 tri->trans_subcmd = trans_subcmd;
 131                 }
 132         } else {
 133                 trans_subcmd = tri->trans_subcmd;
 134         }
 135
 136         /* Only do these ones if we have them. For fragmented SMB Transactions
 137            we may only have the setup area for the first fragment
 138         */
 139         if(mshdr_tvb && setup_tvb){
 140                 if (parent_tree) {
 141                         item = proto_tree_add_item(parent_tree, proto_smb_msp,
 142                                                    mshdr_tvb, 0, -1, FALSE);
 143                         tree = proto_item_add_subtree(item, ett_smb_msp);
 144                 }
 145
 146                 /* do the opcode field */
 147                 opcode = tvb_get_letohs(setup_tvb, offset);
 148
 149                 if (check_col(pinfo->cinfo, COL_INFO)) {
 150                         col_add_str(pinfo->cinfo, COL_INFO,
 151                                     val_to_str(opcode, opcode_vals, "Unknown opcode: 0x%04x"));
 152                 }
 153
 154
 155                 /* These are in the setup words; use "setup_tvb". */
 156
 157                 /* opcode */
 158                 proto_tree_add_uint(tree, hf_opcode, setup_tvb, offset, 2,
 159                     opcode);
 160                 offset += 2;
 161
 162                 /* priority */
 163                 proto_tree_add_item(tree, hf_priority, setup_tvb, offset, 2,
 164                     TRUE);
 165                 offset += 2;
 166
 167                 /* class */
 168                 proto_tree_add_item(tree, hf_class, setup_tvb, offset, 2, TRUE);
 169                 offset += 2;
 170
 171                 /* These are in the rest of the data; use "mshdr_tvb", which
 172                    starts at the same place "setup_tvb" does. */
 173
 174                 /* size */
 175                 /* this is actually bytecount in the SMB Transaction command */
 176                 proto_tree_add_item(tree, hf_size, mshdr_tvb, offset, 2, TRUE);
 177                 offset += 2;
 178
 179                 /* mailslot name */
 180                 len = tvb_strsize(mshdr_tvb, offset);
 181                 proto_tree_add_item(tree, hf_name, mshdr_tvb, offset, len, TRUE);
 182                 offset += len;
 183                 proto_item_set_len(item, offset);
 184         }
 185
 186         switch(trans_subcmd){
 187         case MAILSLOT_BROWSE:
 188                 call_dissector(mailslot_browse_handle, tvb, pinfo,
 189                     parent_tree);
 190                 break;
 191
 192         case MAILSLOT_LANMAN:
 193                 call_dissector(mailslot_lanman_handle, tvb, pinfo,
 194                     parent_tree);
 195                 break;
 196
 197         case MAILSLOT_NET:
 198         case MAILSLOT_TEMP_NETLOGON:
 199         case MAILSLOT_MSSP:
 200                 call_dissector(netlogon_handle, tvb, pinfo,
 201                     parent_tree);
 202                 break;
 203
 204         default:
 205                 /*
 206                  * We dissected the mailslot header, but we don't know
 207                  * how to dissect the message; dissect the latter as data,
 208                  * but indicate that we successfully dissected the mailslot
 209                  * stuff.
 210                  */
 211                 call_dissector(data_handle,tvb, pinfo, parent_tree);
 212                 break;
 213         }
 214         return TRUE;
 215 }
 216
 217 void
 218 proto_register_smb_mailslot(void)
 219 {
 220         static hf_register_info hf[] = {
 221                 { &hf_opcode,
 222                         { "Opcode", "mailslot.opcode", FT_UINT16, BASE_DEC,
 223                         VALS(opcode_vals), 0, "MAILSLOT OpCode", HFILL }},
 224
 225                 { &hf_priority,
 226                         { "Priority", "mailslot.priority", FT_UINT16, BASE_DEC,
 227                         NULL, 0, "MAILSLOT Priority of transaction", HFILL }},
 228
 229                 { &hf_class,
 230                         { "Class", "mailslot.class", FT_UINT16, BASE_DEC,
 231                         VALS(class_vals), 0, "MAILSLOT Class of transaction", HFILL }},
 232
 233                 { &hf_size,
 234                         { "Size", "mailslot.size", FT_UINT16, BASE_DEC,
 235                         NULL, 0, "MAILSLOT Total size of mail data", HFILL }},
 236
 237                 { &hf_name,
 238                         { "Mailslot Name", "mailslot.name", FT_STRING, BASE_NONE,
 239                         NULL, 0, "MAILSLOT Name of mailslot", HFILL }},
 240
 241         };
 242
 243         static gint *ett[] = {
 244                 &ett_smb_msp
 245         };
 246
 247         proto_smb_msp = proto_register_protocol(
 248                 "SMB MailSlot Protocol", "SMB Mailslot", "mailslot");
 249
 250         proto_register_field_array(proto_smb_msp, hf, array_length(hf));
 251         proto_register_subtree_array(ett, array_length(ett));
 252 }
 253
 254 void
 255 proto_reg_handoff_smb_mailslot(void)
 256 {
 257         mailslot_browse_handle = find_dissector("mailslot_browse");
 258         mailslot_lanman_handle = find_dissector("mailslot_lanman");
 259         netlogon_handle = find_dissector("netlogon");
 260         data_handle = find_dissector("data");
 261 }