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 1.36 2004/03/30 19:37:31 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 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <string.h>
  33 #include "packet-smb-common.h"
  34 #include "packet-smb-mailslot.h"
  35 #include "packet-smb-browse.h"
  36 #include "packet-smb-pipe.h"
  37
  38 static int proto_smb_msp = -1;
  39 static int hf_opcode = -1;
  40 static int hf_priority = -1;
  41 static int hf_class = -1;
  42 static int hf_size = -1;
  43 static int hf_name = -1;
  44
  45 static int ett_smb_msp = -1;
  46
  47 static dissector_handle_t mailslot_browse_handle;
  48 static dissector_handle_t mailslot_lanman_handle;
  49 static dissector_handle_t netlogon_handle;
  50 static dissector_handle_t data_handle;
  51
  52 #define MAILSLOT_UNKNOWN              0
  53 #define MAILSLOT_BROWSE               1
  54 #define MAILSLOT_LANMAN               2
  55 #define MAILSLOT_NET                  3
  56 #define MAILSLOT_TEMP_NETLOGON        4
  57 #define MAILSLOT_MSSP                 5
  58
  59 static const value_string opcode_vals[] = {
  60         {1,     "Write Mail Slot"},
  61         {0,     NULL}
  62 };
  63
  64 static const value_string class_vals[] = {
  65         {1,     "Reliable"},
  66         {2,     "Unreliable & Broadcast"},
  67         {0,     NULL}
  68 };
  69
  70 /* decode the SMB mail slot protocol
  71    for requests
  72      mailslot is the name of the mailslot, e.g. BROWSE
  73      si->trans_subcmd is set to the symbolic constant matching the mailslot name.
  74    for responses
  75      mailslot is NULL
  76      si->trans_subcmd gives us which mailslot this response refers to.
  77 */
  78
  79 gboolean
  80 dissect_mailslot_smb(tvbuff_t *mshdr_tvb, tvbuff_t *setup_tvb,
  81                      tvbuff_t *tvb, const char *mailslot, packet_info *pinfo,
  82                      proto_tree *parent_tree)
  83 {
  84         smb_info_t *smb_info;
  85         smb_transact_info_t *tri;
  86         int             trans_subcmd;
  87         proto_tree      *tree = NULL;
  88         proto_item      *item = NULL;
  89         guint16         opcode;
  90         int             offset = 0;
  91         int             len;
  92
  93         if (!proto_is_protocol_enabled(find_protocol_by_id(proto_smb_msp))) {
  94                 return FALSE;
  95         }
  96         pinfo->current_proto = "SMB Mailslot";
  97
  98         if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
  99                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "SMB Mailslot");
 100         }
 101
 102         if ((tvb==NULL) || (tvb_reported_length(tvb)==0)) {
 103                 /* Interim reply */
 104                 col_set_str(pinfo->cinfo, COL_INFO, "Interim reply");
 105                 return TRUE;
 106         }
 107
 108         if (check_col(pinfo->cinfo, COL_INFO)) {
 109                 col_clear(pinfo->cinfo, COL_INFO);
 110         }
 111
 112         smb_info = pinfo->private_data;
 113         if (smb_info->sip != NULL)
 114                 tri = smb_info->sip->extra_info;
 115         else
 116                 tri = NULL;
 117
 118         /* check which mailslot this is about */
 119         trans_subcmd=MAILSLOT_UNKNOWN;
 120         if(smb_info->request){
 121                 if(strncmp(mailslot,"BROWSE",6) == 0){
 122                         trans_subcmd=MAILSLOT_BROWSE;
 123                 } else if(strncmp(mailslot,"LANMAN",6) == 0){
 124                         trans_subcmd=MAILSLOT_LANMAN;
 125                 } else if(strncmp(mailslot,"NET",3) == 0){
 126                         trans_subcmd=MAILSLOT_NET;
 127                 } else if(strncmp(mailslot,"TEMP\\NETLOGON",13) == 0){
 128                         trans_subcmd=MAILSLOT_TEMP_NETLOGON;
 129                 } else if(strncmp(mailslot,"MSSP",4) == 0){
 130                         trans_subcmd=MAILSLOT_MSSP;
 131                 }
 132                 if (!pinfo->fd->flags.visited) {
 133                         if (tri != NULL)
 134                                 tri->trans_subcmd = trans_subcmd;
 135                 }
 136         } else {
 137                 trans_subcmd = tri->trans_subcmd;
 138         }
 139
 140         /* Only do these ones if we have them. For fragmented SMB Transactions
 141            we may only have the setup area for the first fragment
 142         */
 143         if(mshdr_tvb && setup_tvb){
 144                 if (parent_tree) {
 145                         item = proto_tree_add_item(parent_tree, proto_smb_msp,
 146                                                    mshdr_tvb, 0, -1, FALSE);
 147                         tree = proto_item_add_subtree(item, ett_smb_msp);
 148                 }
 149
 150                 /* do the opcode field */
 151                 opcode = tvb_get_letohs(setup_tvb, offset);
 152
 153                 if (check_col(pinfo->cinfo, COL_INFO)) {
 154                         col_add_str(pinfo->cinfo, COL_INFO,
 155                                     val_to_str(opcode, opcode_vals, "Unknown opcode: 0x%04x"));
 156                 }
 157
 158
 159                 /* These are in the setup words; use "setup_tvb". */
 160
 161                 /* opcode */
 162                 proto_tree_add_uint(tree, hf_opcode, setup_tvb, offset, 2,
 163                     opcode);
 164                 offset += 2;
 165
 166                 /* priority */
 167                 proto_tree_add_item(tree, hf_priority, setup_tvb, offset, 2,
 168                     TRUE);
 169                 offset += 2;
 170
 171                 /* class */
 172                 proto_tree_add_item(tree, hf_class, setup_tvb, offset, 2, TRUE);
 173                 offset += 2;
 174
 175                 /* These are in the rest of the data; use "mshdr_tvb", which
 176                    starts at the same place "setup_tvb" does. */
 177
 178                 /* size */
 179                 /* this is actually bytecount in the SMB Transaction command */
 180                 proto_tree_add_item(tree, hf_size, mshdr_tvb, offset, 2, TRUE);
 181                 offset += 2;
 182
 183                 /* mailslot name */
 184                 len = tvb_strsize(mshdr_tvb, offset);
 185                 proto_tree_add_item(tree, hf_name, mshdr_tvb, offset, len, TRUE);
 186                 offset += len;
 187                 proto_item_set_len(item, offset);
 188         }
 189
 190         switch(trans_subcmd){
 191         case MAILSLOT_BROWSE:
 192                 call_dissector(mailslot_browse_handle, tvb, pinfo,
 193                     parent_tree);
 194                 break;
 195
 196         case MAILSLOT_LANMAN:
 197                 call_dissector(mailslot_lanman_handle, tvb, pinfo,
 198                     parent_tree);
 199                 break;
 200
 201         case MAILSLOT_NET:
 202         case MAILSLOT_TEMP_NETLOGON:
 203         case MAILSLOT_MSSP:
 204                 call_dissector(netlogon_handle, tvb, pinfo,
 205                     parent_tree);
 206                 break;
 207
 208         default:
 209                 /*
 210                  * We dissected the mailslot header, but we don't know
 211                  * how to dissect the message; dissect the latter as data,
 212                  * but indicate that we successfully dissected the mailslot
 213                  * stuff.
 214                  */
 215                 call_dissector(data_handle,tvb, pinfo, parent_tree);
 216                 break;
 217         }
 218         return TRUE;
 219 }
 220
 221 void
 222 proto_register_smb_mailslot(void)
 223 {
 224         static hf_register_info hf[] = {
 225                 { &hf_opcode,
 226                         { "Opcode", "mailslot.opcode", FT_UINT16, BASE_DEC,
 227                         VALS(opcode_vals), 0, "MAILSLOT OpCode", HFILL }},
 228
 229                 { &hf_priority,
 230                         { "Priority", "mailslot.priority", FT_UINT16, BASE_DEC,
 231                         NULL, 0, "MAILSLOT Priority of transaction", HFILL }},
 232
 233                 { &hf_class,
 234                         { "Class", "mailslot.class", FT_UINT16, BASE_DEC,
 235                         VALS(class_vals), 0, "MAILSLOT Class of transaction", HFILL }},
 236
 237                 { &hf_size,
 238                         { "Size", "mailslot.size", FT_UINT16, BASE_DEC,
 239                         NULL, 0, "MAILSLOT Total size of mail data", HFILL }},
 240
 241                 { &hf_name,
 242                         { "Mailslot Name", "mailslot.name", FT_STRING, BASE_NONE,
 243                         NULL, 0, "MAILSLOT Name of mailslot", HFILL }},
 244
 245         };
 246
 247         static gint *ett[] = {
 248                 &ett_smb_msp
 249         };
 250
 251         proto_smb_msp = proto_register_protocol(
 252                 "SMB MailSlot Protocol", "SMB Mailslot", "mailslot");
 253
 254         proto_register_field_array(proto_smb_msp, hf, array_length(hf));
 255         proto_register_subtree_array(ett, array_length(ett));
 256 }
 257
 258 void
 259 proto_reg_handoff_smb_mailslot(void)
 260 {
 261         mailslot_browse_handle = find_dissector("mailslot_browse");
 262         mailslot_lanman_handle = find_dissector("mailslot_lanman");
 263         netlogon_handle = find_dissector("netlogon");
 264         data_handle = find_dissector("data");
 265 }