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/* packet-smb-mailslot.c
* Routines for SMB mailslot packet dissection
* Copyright 2000, Jeffrey C. Foster <jfoste@woodward.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* Copied from packet-pop.c
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include "packet-smb.h"
#include "packet-smb-mailslot.h"
void proto_register_smb_mailslot(void);
void proto_reg_handoff_smb_mailslot(void);
static int proto_smb_msp = -1;
static int hf_opcode = -1;
static int hf_priority = -1;
static int hf_class = -1;
static int hf_size = -1;
static int hf_name = -1;
static int ett_smb_msp = -1;
static dissector_handle_t mailslot_browse_handle;
static dissector_handle_t mailslot_lanman_handle;
static dissector_handle_t netlogon_handle;
#define MAILSLOT_UNKNOWN 0
#define MAILSLOT_BROWSE 1
#define MAILSLOT_LANMAN 2
#define MAILSLOT_NET 3
#define MAILSLOT_TEMP_NETLOGON 4
#define MAILSLOT_MSSP 5
static const value_string opcode_vals[] = {
{1, "Write Mail Slot"},
{0, NULL}
};
static const value_string class_vals[] = {
{1, "Reliable"},
{2, "Unreliable & Broadcast"},
{0, NULL}
};
/* decode the SMB mail slot protocol
for requests
mailslot is the name of the mailslot, e.g. BROWSE
si->trans_subcmd is set to the symbolic constant matching the mailslot name.
for responses
mailslot is NULL
si->trans_subcmd gives us which mailslot this response refers to.
*/
gboolean
dissect_mailslot_smb(tvbuff_t *mshdr_tvb, tvbuff_t *setup_tvb,
tvbuff_t *tvb, const char *mailslot, packet_info *pinfo,
proto_tree *parent_tree, smb_info_t* smb_info)
{
smb_transact_info_t *tri;
int trans_subcmd;
proto_tree *tree = NULL;
proto_item *item = NULL;
guint16 opcode;
int offset = 0;
int len;
if (!proto_is_protocol_enabled(find_protocol_by_id(proto_smb_msp))) {
return FALSE;
}
pinfo->current_proto = "SMB Mailslot";
col_set_str(pinfo->cinfo, COL_PROTOCOL, "SMB Mailslot");
if ((tvb==NULL) || (tvb_reported_length(tvb)==0)) {
/* Interim reply */
col_set_str(pinfo->cinfo, COL_INFO, "Interim reply");
return TRUE;
}
col_clear(pinfo->cinfo, COL_INFO);
if (smb_info->sip != NULL && smb_info->sip->extra_info_type == SMB_EI_TRI)
tri = (smb_transact_info_t *)smb_info->sip->extra_info;
else
tri = NULL;
/* check which mailslot this is about */
trans_subcmd=MAILSLOT_UNKNOWN;
if(smb_info->request){
if(strncmp(mailslot,"BROWSE",6) == 0){
trans_subcmd=MAILSLOT_BROWSE;
} else if(strncmp(mailslot,"LANMAN",6) == 0){
trans_subcmd=MAILSLOT_LANMAN;
} else if(strncmp(mailslot,"NET",3) == 0){
trans_subcmd=MAILSLOT_NET;
} else if(strncmp(mailslot,"TEMP\\NETLOGON",13) == 0){
trans_subcmd=MAILSLOT_TEMP_NETLOGON;
} else if(strncmp(mailslot,"MSSP",4) == 0){
trans_subcmd=MAILSLOT_MSSP;
}
if (!pinfo->fd->visited) {
if (tri != NULL)
tri->trans_subcmd = trans_subcmd;
}
} else {
if(!tri){
return FALSE;
} else {
trans_subcmd = tri->trans_subcmd;
}
}
/* Only do these ones if we have them. For fragmented SMB Transactions
we may only have the setup area for the first fragment
*/
if(mshdr_tvb && setup_tvb){
if (parent_tree) {
item = proto_tree_add_item(parent_tree, proto_smb_msp,
mshdr_tvb, 0, -1, ENC_NA);
tree = proto_item_add_subtree(item, ett_smb_msp);
}
/* do the opcode field */
opcode = tvb_get_letohs(setup_tvb, offset);
col_add_str(pinfo->cinfo, COL_INFO,
val_to_str(opcode, opcode_vals, "Unknown opcode: 0x%04x"));
/* These are in the setup words; use "setup_tvb". */
/* opcode */
proto_tree_add_uint(tree, hf_opcode, setup_tvb, offset, 2,
opcode);
offset += 2;
/* priority */
proto_tree_add_item(tree, hf_priority, setup_tvb, offset, 2,
ENC_LITTLE_ENDIAN);
offset += 2;
/* class */
proto_tree_add_item(tree, hf_class, setup_tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
/* These are in the rest of the data; use "mshdr_tvb", which
starts at the same place "setup_tvb" does. */
/* size */
/* this is actually bytecount in the SMB Transaction command */
proto_tree_add_item(tree, hf_size, mshdr_tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
/* mailslot name */
len = tvb_strsize(mshdr_tvb, offset);
proto_tree_add_item(tree, hf_name, mshdr_tvb, offset, len, ENC_ASCII);
offset += len;
proto_item_set_len(item, offset);
}
switch(trans_subcmd){
case MAILSLOT_BROWSE:
call_dissector(mailslot_browse_handle, tvb, pinfo,
parent_tree);
break;
case MAILSLOT_LANMAN:
call_dissector(mailslot_lanman_handle, tvb, pinfo,
parent_tree);
break;
case MAILSLOT_NET:
case MAILSLOT_TEMP_NETLOGON:
case MAILSLOT_MSSP:
call_dissector(netlogon_handle, tvb, pinfo,
parent_tree);
break;
default:
/*
* We dissected the mailslot header, but we don't know
* how to dissect the message; dissect the latter as data,
* but indicate that we successfully dissected the mailslot
* stuff.
*/
call_data_dissector(tvb, pinfo, parent_tree);
break;
}
return TRUE;
}
void
proto_register_smb_mailslot(void)
{
static hf_register_info hf[] = {
{ &hf_opcode,
{ "Opcode", "mailslot.opcode", FT_UINT16, BASE_DEC,
VALS(opcode_vals), 0, "MAILSLOT OpCode", HFILL }},
{ &hf_priority,
{ "Priority", "mailslot.priority", FT_UINT16, BASE_DEC,
NULL, 0, "MAILSLOT Priority of transaction", HFILL }},
{ &hf_class,
{ "Class", "mailslot.class", FT_UINT16, BASE_DEC,
VALS(class_vals), 0, "MAILSLOT Class of transaction", HFILL }},
{ &hf_size,
{ "Size", "mailslot.size", FT_UINT16, BASE_DEC,
NULL, 0, "MAILSLOT Total size of mail data", HFILL }},
{ &hf_name,
{ "Mailslot Name", "mailslot.name", FT_STRING, BASE_NONE,
NULL, 0, "MAILSLOT Name of mailslot", HFILL }},
};
static gint *ett[] = {
&ett_smb_msp
};
proto_smb_msp = proto_register_protocol("SMB MailSlot Protocol", "SMB Mailslot", "mailslot");
proto_register_field_array(proto_smb_msp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_smb_mailslot(void)
{
mailslot_browse_handle = find_dissector_add_dependency("mailslot_browse", proto_smb_msp);
mailslot_lanman_handle = find_dissector_add_dependency("mailslot_lanman", proto_smb_msp);
netlogon_handle = find_dissector_add_dependency("smb_netlogon", proto_smb_msp);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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