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