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 1.31 2002/02/10 02:25:14 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 "packet-smb-common.h"
  29 #include "packet-smb-mailslot.h"
  30 #include "packet-smb-browse.h"
  31 #include "packet-smb-logon.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 data_handle;
  44
  45 #define MAILSLOT_UNKNOWN              0
  46 #define MAILSLOT_BROWSE               1
  47 #define MAILSLOT_LANMAN               2
  48 #define MAILSLOT_NET                  3
  49 #define MAILSLOT_TEMP_NETLOGON        4
  50 #define MAILSLOT_MSSP                 5
  51
  52 static const value_string opcode_vals[] = {
  53         {1,     "Write Mail Slot"},
  54         {0,     NULL}
  55 };
  56
  57 static const value_string class_vals[] = {
  58         {1,     "Reliable"},
  59         {2,     "Unreliable & Broadcast"},
  60         {0,     NULL}
  61 };
  62
  63 /* decode the SMB mail slot protocol
  64    for requests
  65      mailslot is the name of the mailslot, e.g. BROWSE
  66      si->trans_subcmd is set to the symbolic constant matching the mailslot name.
  67    for responses
  68      mailslot is NULL
  69      si->trans_subcmd gives us which mailslot this response refers to.
  70 */
  71
  72 gboolean
  73 dissect_mailslot_smb(tvbuff_t *mshdr_tvb, tvbuff_t *setup_tvb,
  74                      tvbuff_t *tvb, const char *mailslot, packet_info *pinfo,
  75                      proto_tree *parent_tree)
  76 {
  77         smb_info_t *smb_info;
  78         smb_transact_info_t *tri;
  79         int             trans_subcmd;
  80         proto_tree      *tree = NULL;
  81         proto_item      *item = NULL;
  82         guint16         opcode;
  83         int             offset = 0;
  84         int             len;
  85         gboolean        dissected;
  86
  87         if (!proto_is_protocol_enabled(proto_smb_msp)) {
  88                 return FALSE;
  89         }
  90         pinfo->current_proto = "SMB Mailslot";
  91
  92         if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
  93                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "SMB Mailslot");
  94         }
  95
  96         if ((tvb==NULL) || (tvb_reported_length(tvb)==0)) {
  97                 /* Interim reply */
  98                 col_set_str(pinfo->cinfo, COL_INFO, "Interim reply");
  99                 return TRUE;
 100         }
 101
 102         if (check_col(pinfo->cinfo, COL_INFO)) {
 103                 col_clear(pinfo->cinfo, COL_INFO);
 104         }
 105
 106         smb_info = pinfo->private_data;
 107         if (smb_info->sip != NULL)
 108                 tri = smb_info->sip->extra_info;
 109         else
 110                 tri = NULL;
 111
 112         /* check which mailslot this is about */
 113         trans_subcmd=MAILSLOT_UNKNOWN;
 114         if(smb_info->request){
 115                 if(strncmp(mailslot,"BROWSE",6) == 0){
 116                         trans_subcmd=MAILSLOT_BROWSE;
 117                 } else if(strncmp(mailslot,"LANMAN",6) == 0){
 118                         trans_subcmd=MAILSLOT_LANMAN;
 119                 } else if(strncmp(mailslot,"NET",3) == 0){
 120                         trans_subcmd=MAILSLOT_NET;
 121                 } else if(strncmp(mailslot,"TEMP\\NETLOGON",13) == 0){
 122                         trans_subcmd=MAILSLOT_TEMP_NETLOGON;
 123                 } else if(strncmp(mailslot,"MSSP",4) == 0){
 124                         trans_subcmd=MAILSLOT_MSSP;
 125                 }
 126                 if (!pinfo->fd->flags.visited) {
 127                         if (tri != NULL)
 128                                 tri->trans_subcmd = trans_subcmd;
 129                 }
 130         } else {
 131                 trans_subcmd = tri->trans_subcmd;
 132         }
 133
 134         /* Only do these ones if we have them. For fragmented SMB Transactions
 135            we may only have the setup area for the first fragment
 136         */
 137         if(mshdr_tvb && setup_tvb){
 138                 if (parent_tree) {
 139                         item = proto_tree_add_item(parent_tree, proto_smb_msp,
 140                                                    mshdr_tvb, 0, -1, FALSE);
 141                         tree = proto_item_add_subtree(item, ett_smb_msp);
 142                 }
 143
 144                 /* do the opcode field */
 145                 opcode = tvb_get_letohs(setup_tvb, offset);
 146
 147                 if (check_col(pinfo->cinfo, COL_INFO)) {
 148                         col_add_str(pinfo->cinfo, COL_INFO,
 149                                     val_to_str(opcode, opcode_vals, "Unknown opcode: 0x%04x"));
 150                 }
 151
 152
 153                 /* These are in the setup words; use "setup_tvb". */
 154
 155                 /* opcode */
 156                 proto_tree_add_uint(tree, hf_opcode, setup_tvb, offset, 2,
 157                     opcode);
 158                 offset += 2;
 159
 160                 /* priority */
 161                 proto_tree_add_item(tree, hf_priority, setup_tvb, offset, 2,
 162                     TRUE);
 163                 offset += 2;
 164
 165                 /* class */
 166                 proto_tree_add_item(tree, hf_class, setup_tvb, offset, 2, TRUE);
 167                 offset += 2;
 168
 169                 /* These are in the rest of the data; use "mshdr_tvb", which
 170                    starts at the same place "setup_tvb" does. */
 171
 172                 /* size */
 173                 /* this is actually bytecount in the SMB Transaction command */
 174                 proto_tree_add_item(tree, hf_size, mshdr_tvb, offset, 2, TRUE);
 175                 offset += 2;
 176
 177                 /* mailslot name */
 178                 len = tvb_strsize(mshdr_tvb, offset);
 179                 proto_tree_add_item(tree, hf_name, mshdr_tvb, offset, len, TRUE);
 180                 offset += len;
 181                 proto_item_set_len(item, offset);
 182         }
 183
 184         dissected = FALSE;
 185         switch(trans_subcmd){
 186         case MAILSLOT_BROWSE:
 187                 dissected = dissect_mailslot_browse(tvb, pinfo, parent_tree);
 188                 break;
 189         case MAILSLOT_LANMAN:
 190                 dissected = dissect_mailslot_lanman(tvb, pinfo, parent_tree);
 191                 break;
 192         case MAILSLOT_NET:
 193         case MAILSLOT_TEMP_NETLOGON:
 194         case MAILSLOT_MSSP:
 195                 dissected = dissect_smb_logon(tvb, pinfo, parent_tree);
 196                 break;
 197         }
 198         if (!dissected) {
 199                 /*
 200                  * We dissected the mailslot header, but not the
 201                  * message; dissect the latter as data, but indicate
 202                  * that we successfully dissected the mailslot stuff.
 203                  */
 204                 call_dissector(data_handle,tvb, pinfo, parent_tree);
 205         }
 206         return TRUE;
 207 }
 208
 209 void
 210 proto_register_smb_mailslot(void)
 211 {
 212         static hf_register_info hf[] = {
 213                 { &hf_opcode,
 214                         { "Opcode", "mailslot.opcode", FT_UINT16, BASE_DEC,
 215                         VALS(opcode_vals), 0, "MAILSLOT OpCode", HFILL }},
 216
 217                 { &hf_priority,
 218                         { "Priority", "mailslot.priority", FT_UINT16, BASE_DEC,
 219                         NULL, 0, "MAILSLOT Priority of transaction", HFILL }},
 220
 221                 { &hf_class,
 222                         { "Class", "mailslot.class", FT_UINT16, BASE_DEC,
 223                         VALS(class_vals), 0, "MAILSLOT Class of transaction", HFILL }},
 224
 225                 { &hf_size,
 226                         { "Size", "mailslot.size", FT_UINT16, BASE_DEC,
 227                         NULL, 0, "MAILSLOT Total size of mail data", HFILL }},
 228
 229                 { &hf_name,
 230                         { "Mailslot Name", "mailslot.name", FT_STRING, BASE_NONE,
 231                         NULL, 0, "MAILSLOT Name of mailslot", HFILL }},
 232
 233         };
 234
 235         static gint *ett[] = {
 236                 &ett_smb_msp
 237         };
 238
 239         proto_smb_msp = proto_register_protocol(
 240                 "SMB MailSlot Protocol", "SMB Mailslot", "mailslot");
 241
 242         proto_register_field_array(proto_smb_msp, hf, array_length(hf));
 243         proto_register_subtree_array(ett, array_length(ett));
 244 }
 245
 246 void
 247 proto_reg_handoff_smb_mailslot(void)
 248 {
 249         data_handle = find_dissector("data");
 250 }