epan/dissectors/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  * $Id$
   6  *
   7  * Wireshark - Network traffic analyzer
   8  * By Gerald Combs <gerald@wireshark.org>
   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
  34 #include <glib.h>
  35
  36 #include <epan/packet.h>
  37 #include <epan/emem.h>
  38 #include <epan/dissectors/packet-smb.h>
  39 #include "packet-smb-mailslot.h"
  40 #include "packet-smb-browse.h"
  41 #include "packet-smb-pipe.h"
  42
  43 static int proto_smb_msp = -1;
  44 static int hf_opcode = -1;
  45 static int hf_priority = -1;
  46 static int hf_class = -1;
  47 static int hf_size = -1;
  48 static int hf_name = -1;
  49
  50 static int ett_smb_msp = -1;
  51
  52 static dissector_handle_t mailslot_browse_handle;
  53 static dissector_handle_t mailslot_lanman_handle;
  54 static dissector_handle_t netlogon_handle;
  55 static dissector_handle_t data_handle;
  56
  57 #define MAILSLOT_UNKNOWN              0
  58 #define MAILSLOT_BROWSE               1
  59 #define MAILSLOT_LANMAN               2
  60 #define MAILSLOT_NET                  3
  61 #define MAILSLOT_TEMP_NETLOGON        4
  62 #define MAILSLOT_MSSP                 5
  63
  64 static const value_string opcode_vals[] = {
  65         {1,     "Write Mail Slot"},
  66         {0,     NULL}
  67 };
  68
  69 static const value_string class_vals[] = {
  70         {1,     "Reliable"},
  71         {2,     "Unreliable & Broadcast"},
  72         {0,     NULL}
  73 };
  74
  75 /* decode the SMB mail slot protocol
  76    for requests
  77      mailslot is the name of the mailslot, e.g. BROWSE
  78      si->trans_subcmd is set to the symbolic constant matching the mailslot name.
  79    for responses
  80      mailslot is NULL
  81      si->trans_subcmd gives us which mailslot this response refers to.
  82 */
  83
  84 gboolean
  85 dissect_mailslot_smb(tvbuff_t *mshdr_tvb, tvbuff_t *setup_tvb,
  86                      tvbuff_t *tvb, const char *mailslot, packet_info *pinfo,
  87                      proto_tree *parent_tree)
  88 {
  89         smb_info_t *smb_info;
  90         smb_transact_info_t *tri;
  91         int             trans_subcmd;
  92         proto_tree      *tree = NULL;
  93         proto_item      *item = NULL;
  94         guint16         opcode;
  95         int             offset = 0;
  96         int             len;
  97
  98         if (!proto_is_protocol_enabled(find_protocol_by_id(proto_smb_msp))) {
  99                 return FALSE;
 100         }
 101         pinfo->current_proto = "SMB Mailslot";
 102
 103         if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
 104                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "SMB Mailslot");
 105         }
 106
 107         if ((tvb==NULL) || (tvb_reported_length(tvb)==0)) {
 108                 /* Interim reply */
 109                 if (check_col (pinfo->cinfo, COL_INFO)) {
 110                         col_set_str(pinfo->cinfo, COL_INFO, "Interim reply");
 111                 }
 112                 return TRUE;
 113         }
 114
 115         if (check_col(pinfo->cinfo, COL_INFO)) {
 116                 col_clear(pinfo->cinfo, COL_INFO);
 117         }
 118
 119         smb_info = pinfo->private_data;
 120         if (smb_info->sip != NULL && smb_info->sip->extra_info_type == SMB_EI_TRI)
 121                 tri = smb_info->sip->extra_info;
 122         else
 123                 tri = NULL;
 124
 125         /* check which mailslot this is about */
 126         trans_subcmd=MAILSLOT_UNKNOWN;
 127         if(smb_info->request){
 128                 if(strncmp(mailslot,"BROWSE",6) == 0){
 129                         trans_subcmd=MAILSLOT_BROWSE;
 130                 } else if(strncmp(mailslot,"LANMAN",6) == 0){
 131                         trans_subcmd=MAILSLOT_LANMAN;
 132                 } else if(strncmp(mailslot,"NET",3) == 0){
 133                         trans_subcmd=MAILSLOT_NET;
 134                 } else if(strncmp(mailslot,"TEMP\\NETLOGON",13) == 0){
 135                         trans_subcmd=MAILSLOT_TEMP_NETLOGON;
 136                 } else if(strncmp(mailslot,"MSSP",4) == 0){
 137                         trans_subcmd=MAILSLOT_MSSP;
 138                 }
 139                 if (!pinfo->fd->flags.visited) {
 140                         if (tri != NULL)
 141                                 tri->trans_subcmd = trans_subcmd;
 142                 }
 143         } else {
 144                 if(!tri){
 145                         return FALSE;
 146                 } else {
 147                         trans_subcmd = tri->trans_subcmd;
 148                 }
 149         }
 150
 151         /* Only do these ones if we have them. For fragmented SMB Transactions
 152            we may only have the setup area for the first fragment
 153         */
 154         if(mshdr_tvb && setup_tvb){
 155                 if (parent_tree) {
 156                         item = proto_tree_add_item(parent_tree, proto_smb_msp,
 157                                                    mshdr_tvb, 0, -1, FALSE);
 158                         tree = proto_item_add_subtree(item, ett_smb_msp);
 159                 }
 160
 161                 /* do the opcode field */
 162                 opcode = tvb_get_letohs(setup_tvb, offset);
 163
 164                 if (check_col(pinfo->cinfo, COL_INFO)) {
 165                         col_add_str(pinfo->cinfo, COL_INFO,
 166                                     val_to_str(opcode, opcode_vals, "Unknown opcode: 0x%04x"));
 167                 }
 168
 169
 170                 /* These are in the setup words; use "setup_tvb". */
 171
 172                 /* opcode */
 173                 proto_tree_add_uint(tree, hf_opcode, setup_tvb, offset, 2,
 174                     opcode);
 175                 offset += 2;
 176
 177                 /* priority */
 178                 proto_tree_add_item(tree, hf_priority, setup_tvb, offset, 2,
 179                     TRUE);
 180                 offset += 2;
 181
 182                 /* class */
 183                 proto_tree_add_item(tree, hf_class, setup_tvb, offset, 2, TRUE);
 184                 offset += 2;
 185
 186                 /* These are in the rest of the data; use "mshdr_tvb", which
 187                    starts at the same place "setup_tvb" does. */
 188
 189                 /* size */
 190                 /* this is actually bytecount in the SMB Transaction command */
 191                 proto_tree_add_item(tree, hf_size, mshdr_tvb, offset, 2, TRUE);
 192                 offset += 2;
 193
 194                 /* mailslot name */
 195                 len = tvb_strsize(mshdr_tvb, offset);
 196                 proto_tree_add_item(tree, hf_name, mshdr_tvb, offset, len, TRUE);
 197                 offset += len;
 198                 proto_item_set_len(item, offset);
 199         }
 200
 201         switch(trans_subcmd){
 202         case MAILSLOT_BROWSE:
 203                 call_dissector(mailslot_browse_handle, tvb, pinfo,
 204                     parent_tree);
 205                 break;
 206
 207         case MAILSLOT_LANMAN:
 208                 call_dissector(mailslot_lanman_handle, tvb, pinfo,
 209                     parent_tree);
 210                 break;
 211
 212         case MAILSLOT_NET:
 213         case MAILSLOT_TEMP_NETLOGON:
 214         case MAILSLOT_MSSP:
 215                 call_dissector(netlogon_handle, tvb, pinfo,
 216                     parent_tree);
 217                 break;
 218
 219         default:
 220                 /*
 221                  * We dissected the mailslot header, but we don't know
 222                  * how to dissect the message; dissect the latter as data,
 223                  * but indicate that we successfully dissected the mailslot
 224                  * stuff.
 225                  */
 226                 call_dissector(data_handle ,tvb, pinfo, parent_tree);
 227                 break;
 228         }
 229         return TRUE;
 230 }
 231
 232 void
 233 proto_register_smb_mailslot(void)
 234 {
 235         static hf_register_info hf[] = {
 236                 { &hf_opcode,
 237                         { "Opcode", "mailslot.opcode", FT_UINT16, BASE_DEC,
 238                         VALS(opcode_vals), 0, "MAILSLOT OpCode", HFILL }},
 239
 240                 { &hf_priority,
 241                         { "Priority", "mailslot.priority", FT_UINT16, BASE_DEC,
 242                         NULL, 0, "MAILSLOT Priority of transaction", HFILL }},
 243
 244                 { &hf_class,
 245                         { "Class", "mailslot.class", FT_UINT16, BASE_DEC,
 246                         VALS(class_vals), 0, "MAILSLOT Class of transaction", HFILL }},
 247
 248                 { &hf_size,
 249                         { "Size", "mailslot.size", FT_UINT16, BASE_DEC,
 250                         NULL, 0, "MAILSLOT Total size of mail data", HFILL }},
 251
 252                 { &hf_name,
 253                         { "Mailslot Name", "mailslot.name", FT_STRING, BASE_NONE,
 254                         NULL, 0, "MAILSLOT Name of mailslot", HFILL }},
 255
 256         };
 257
 258         static gint *ett[] = {
 259                 &ett_smb_msp
 260         };
 261
 262         proto_smb_msp = proto_register_protocol(
 263                 "SMB MailSlot Protocol", "SMB Mailslot", "mailslot");
 264
 265         proto_register_field_array(proto_smb_msp, hf, array_length(hf));
 266         proto_register_subtree_array(ett, array_length(ett));
 267 }
 268
 269 void
 270 proto_reg_handoff_smb_mailslot(void)
 271 {
 272         mailslot_browse_handle = find_dissector("mailslot_browse");
 273         mailslot_lanman_handle = find_dissector("mailslot_lanman");
 274         netlogon_handle = find_dissector("smb_netlogon");
 275         data_handle = find_dissector("data");
 276 }