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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  26  */
  27
  28 #include "config.h"
  29
  30 #include <string.h>
  31
  32 #include <glib.h>
  33
  34 #include <epan/packet.h>
  35 #include <epan/dissectors/packet-smb.h>
  36 #include "packet-smb-mailslot.h"
  37 #include "packet-smb-browse.h"
  38 #include "packet-smb-pipe.h"
  39
  40 static int proto_smb_msp = -1;
  41 static int hf_opcode = -1;
  42 static int hf_priority = -1;
  43 static int hf_class = -1;
  44 static int hf_size = -1;
  45 static int hf_name = -1;
  46
  47 static int ett_smb_msp = -1;
  48
  49 static dissector_handle_t mailslot_browse_handle;
  50 static dissector_handle_t mailslot_lanman_handle;
  51 static dissector_handle_t netlogon_handle;
  52 static dissector_handle_t data_handle;
  53
  54 #define MAILSLOT_UNKNOWN              0
  55 #define MAILSLOT_BROWSE               1
  56 #define MAILSLOT_LANMAN               2
  57 #define MAILSLOT_NET                  3
  58 #define MAILSLOT_TEMP_NETLOGON        4
  59 #define MAILSLOT_MSSP                 5
  60
  61 static const value_string opcode_vals[] = {
  62         {1,     "Write Mail Slot"},
  63         {0,     NULL}
  64 };
  65
  66 static const value_string class_vals[] = {
  67         {1,     "Reliable"},
  68         {2,     "Unreliable & Broadcast"},
  69         {0,     NULL}
  70 };
  71
  72 /* decode the SMB mail slot protocol
  73    for requests
  74      mailslot is the name of the mailslot, e.g. BROWSE
  75      si->trans_subcmd is set to the symbolic constant matching the mailslot name.
  76    for responses
  77      mailslot is NULL
  78      si->trans_subcmd gives us which mailslot this response refers to.
  79 */
  80
  81 gboolean
  82 dissect_mailslot_smb(tvbuff_t *mshdr_tvb, tvbuff_t *setup_tvb,
  83                      tvbuff_t *tvb, const char *mailslot, packet_info *pinfo,
  84                      proto_tree *parent_tree, smb_info_t* smb_info)
  85 {
  86         smb_transact_info_t *tri;
  87         int             trans_subcmd;
  88         proto_tree      *tree = NULL;
  89         proto_item      *item = NULL;
  90         guint16         opcode;
  91         int             offset = 0;
  92         int             len;
  93
  94         if (!proto_is_protocol_enabled(find_protocol_by_id(proto_smb_msp))) {
  95                 return FALSE;
  96         }
  97         pinfo->current_proto = "SMB Mailslot";
  98
  99         col_set_str(pinfo->cinfo, COL_PROTOCOL, "SMB Mailslot");
 100
 101         if ((tvb==NULL) || (tvb_reported_length(tvb)==0)) {
 102                 /* Interim reply */
 103                 col_set_str(pinfo->cinfo, COL_INFO, "Interim reply");
 104                 return TRUE;
 105         }
 106
 107         col_clear(pinfo->cinfo, COL_INFO);
 108
 109         if (smb_info->sip != NULL && smb_info->sip->extra_info_type == SMB_EI_TRI)
 110                 tri = (smb_transact_info_t *)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                 if(!tri){
 134                         return FALSE;
 135                 } else {
 136                         trans_subcmd = tri->trans_subcmd;
 137                 }
 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, ENC_NA);
 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                 col_add_str(pinfo->cinfo, COL_INFO,
 154                                     val_to_str(opcode, opcode_vals, "Unknown opcode: 0x%04x"));
 155
 156
 157                 /* These are in the setup words; use "setup_tvb". */
 158
 159                 /* opcode */
 160                 proto_tree_add_uint(tree, hf_opcode, setup_tvb, offset, 2,
 161                     opcode);
 162                 offset += 2;
 163
 164                 /* priority */
 165                 proto_tree_add_item(tree, hf_priority, setup_tvb, offset, 2,
 166                     ENC_LITTLE_ENDIAN);
 167                 offset += 2;
 168
 169                 /* class */
 170                 proto_tree_add_item(tree, hf_class, setup_tvb, offset, 2, ENC_LITTLE_ENDIAN);
 171                 offset += 2;
 172
 173                 /* These are in the rest of the data; use "mshdr_tvb", which
 174                    starts at the same place "setup_tvb" does. */
 175
 176                 /* size */
 177                 /* this is actually bytecount in the SMB Transaction command */
 178                 proto_tree_add_item(tree, hf_size, mshdr_tvb, offset, 2, ENC_LITTLE_ENDIAN);
 179                 offset += 2;
 180
 181                 /* mailslot name */
 182                 len = tvb_strsize(mshdr_tvb, offset);
 183                 proto_tree_add_item(tree, hf_name, mshdr_tvb, offset, len, ENC_ASCII|ENC_NA);
 184                 offset += len;
 185                 proto_item_set_len(item, offset);
 186         }
 187
 188         switch(trans_subcmd){
 189         case MAILSLOT_BROWSE:
 190                 call_dissector(mailslot_browse_handle, tvb, pinfo,
 191                     parent_tree);
 192                 break;
 193
 194         case MAILSLOT_LANMAN:
 195                 call_dissector(mailslot_lanman_handle, tvb, pinfo,
 196                     parent_tree);
 197                 break;
 198
 199         case MAILSLOT_NET:
 200         case MAILSLOT_TEMP_NETLOGON:
 201         case MAILSLOT_MSSP:
 202                 call_dissector(netlogon_handle, tvb, pinfo,
 203                     parent_tree);
 204                 break;
 205
 206         default:
 207                 /*
 208                  * We dissected the mailslot header, but we don't know
 209                  * how to dissect the message; dissect the latter as data,
 210                  * but indicate that we successfully dissected the mailslot
 211                  * stuff.
 212                  */
 213                 call_dissector(data_handle ,tvb, pinfo, parent_tree);
 214                 break;
 215         }
 216         return TRUE;
 217 }
 218
 219 void
 220 proto_register_smb_mailslot(void)
 221 {
 222         static hf_register_info hf[] = {
 223                 { &hf_opcode,
 224                         { "Opcode", "mailslot.opcode", FT_UINT16, BASE_DEC,
 225                         VALS(opcode_vals), 0, "MAILSLOT OpCode", HFILL }},
 226
 227                 { &hf_priority,
 228                         { "Priority", "mailslot.priority", FT_UINT16, BASE_DEC,
 229                         NULL, 0, "MAILSLOT Priority of transaction", HFILL }},
 230
 231                 { &hf_class,
 232                         { "Class", "mailslot.class", FT_UINT16, BASE_DEC,
 233                         VALS(class_vals), 0, "MAILSLOT Class of transaction", HFILL }},
 234
 235                 { &hf_size,
 236                         { "Size", "mailslot.size", FT_UINT16, BASE_DEC,
 237                         NULL, 0, "MAILSLOT Total size of mail data", HFILL }},
 238
 239                 { &hf_name,
 240                         { "Mailslot Name", "mailslot.name", FT_STRING, BASE_NONE,
 241                         NULL, 0, "MAILSLOT Name of mailslot", HFILL }},
 242
 243         };
 244
 245         static gint *ett[] = {
 246                 &ett_smb_msp
 247         };
 248
 249         proto_smb_msp = proto_register_protocol(
 250                 "SMB MailSlot Protocol", "SMB Mailslot", "mailslot");
 251
 252         proto_register_field_array(proto_smb_msp, hf, array_length(hf));
 253         proto_register_subtree_array(ett, array_length(ett));
 254 }
 255
 256 void
 257 proto_reg_handoff_smb_mailslot(void)
 258 {
 259         mailslot_browse_handle = find_dissector("mailslot_browse");
 260         mailslot_lanman_handle = find_dissector("mailslot_lanman");
 261         netlogon_handle = find_dissector("smb_netlogon");
 262         data_handle = find_dissector("data");
 263 }