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wireshark/epan/dissectors/packet-telnet.c
Michael Mann 268841f3e0 Combine Decode As and port preferences for tcp.port dissector table. 
This patch introduces new APIs to allow dissectors to have a preference for
a (TCP) port, but the underlying data is actually part of Decode As functionality.
For now the APIs are intentionally separate from the regular APIs that register a
dissector within a dissector table.  It may be possible to eventually combine the
two so that all dissectors that register with a dissector table have an opportunity
to "automatically" have a preference to adjust the "table value" through the
preferences dialog.

The tcp.port dissector table was used as the guinea pig.  This will eventually be
expanded to other dissector tables as well (most notably UDP ports).  Some
dissectors that "shared" a TCP/UDP port preference were also converted. It also
removed the need for some preference callback functions (mostly when the callback
function was the proto_reg_handoff function) so there is cleanup around that.

Dissectors that has a port preference whose default was 0 were switched to using
the dissector_add_for_decode_as_with_preference API rather than dissector_add_uint_with_preference

Also added comments for TCP ports used that aren't IANA registered.

Change-Id: I99604f95d426ad345f4b494598d94178b886eb67
Reviewed-on: https://code.wireshark.org/review/17724
Reviewed-by: Michael Mann <mmann78@netscape.net>
2016-10-08 02:44:53 +00:00

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/* packet-telnet.c
* Routines for Telnet packet dissection; see RFC 854 and RFC 855
* Copyright 1999, Richard Sharpe <rsharpe@ns.aus.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/* Telnet authentication options as per RFC2941
* Kerberos v5 telnet authentication as per RFC2942
*/
#include "config.h"
#include <stdlib.h>
#include <epan/packet.h>
#include <epan/expert.h>
#include <epan/asn1.h>
#include "packet-kerberos.h"
#include "packet-ssl-utils.h"
#include "packet-tn3270.h"
#include "packet-tn5250.h"
void proto_reg_handoff_telnet(void);
void proto_register_telnet(void);
static int proto_telnet = -1;
static int hf_telnet_cmd = -1;
static int hf_telnet_subcmd = -1;
static int hf_telnet_auth_cmd = -1;
static int hf_telnet_auth_name = -1;
static int hf_telnet_auth_type = -1;
static int hf_telnet_auth_mod_who = -1;
static int hf_telnet_auth_mod_how = -1;
static int hf_telnet_auth_mod_cred_fwd = -1;
static int hf_telnet_auth_mod_enc = -1;
static int hf_telnet_auth_krb5_type = -1;
static int hf_telnet_string_subopt_value = -1;
static int hf_telnet_naws_subopt_width = -1;
static int hf_telnet_naws_subopt_height = -1;
static int hf_telnet_outmark_subopt_cmd = -1;
static int hf_telnet_outmark_subopt_banner = -1;
static int hf_telnet_comport_subopt_signature = -1;
static int hf_telnet_comport_subopt_baud_rate = -1;
static int hf_telnet_comport_subopt_data_size = -1;
static int hf_telnet_comport_subopt_parity = -1;
static int hf_telnet_comport_subopt_stop = -1;
static int hf_telnet_comport_subopt_control = -1;
static int hf_telnet_comport_linestate = -1;
static int hf_telnet_comport_set_linestate_mask = -1;
static int hf_telnet_comport_modemstate = -1;
static int hf_telnet_comport_set_modemstate_mask = -1;
static int hf_telnet_comport_subopt_flow_control_suspend = -1;
static int hf_telnet_comport_subopt_flow_control_resume = -1;
static int hf_telnet_comport_subopt_purge = -1;
static int hf_telnet_rfc_subopt_cmd = -1;
static int hf_telnet_tabstop = -1;
static int hf_telnet_enc_cmd = -1;
static int hf_telnet_enc_type = -1;
static int hf_telnet_enc_type_data = -1;
static int hf_telnet_enc_key_id = -1;
static int hf_telnet_data = -1;
static int hf_telnet_option_data = -1;
static int hf_telnet_subcommand_data = -1;
static int hf_tn3270_subopt = -1;
static int hf_tn3270_connect = -1;
static int hf_tn3270_is = -1;
static int hf_tn3270_request_string = -1;
static int hf_tn3270_reason = -1;
static int hf_tn3270_request = -1;
static int hf_tn3270_regime_subopt_value = -1;
static int hf_tn3270_regime_cmd = -1;
static int hf_telnet_starttls = -1;
static gint ett_telnet = -1;
static gint ett_telnet_cmd = -1;
static gint ett_telnet_subopt = -1;
static gint ett_status_subopt = -1;
static gint ett_rcte_subopt = -1;
static gint ett_olw_subopt = -1;
static gint ett_ops_subopt = -1;
static gint ett_crdisp_subopt = -1;
static gint ett_htstops_subopt = -1;
static gint ett_htdisp_subopt = -1;
static gint ett_ffdisp_subopt = -1;
static gint ett_vtstops_subopt = -1;
static gint ett_vtdisp_subopt = -1;
static gint ett_lfdisp_subopt = -1;
static gint ett_extasc_subopt = -1;
static gint ett_bytemacro_subopt = -1;
static gint ett_det_subopt = -1;
static gint ett_supdupout_subopt = -1;
static gint ett_sendloc_subopt = -1;
static gint ett_termtype_subopt = -1;
static gint ett_tacacsui_subopt = -1;
static gint ett_outmark_subopt = -1;
static gint ett_tlocnum_subopt = -1;
static gint ett_tn3270reg_subopt = -1;
static gint ett_x3pad_subopt = -1;
static gint ett_naws_subopt = -1;
static gint ett_tspeed_subopt = -1;
static gint ett_rfc_subopt = -1;
static gint ett_linemode_subopt = -1;
static gint ett_xdpyloc_subopt = -1;
static gint ett_env_subopt = -1;
static gint ett_auth_subopt = -1;
static gint ett_enc_subopt = -1;
static gint ett_newenv_subopt = -1;
static gint ett_tn3270e_subopt = -1;
static gint ett_xauth_subopt = -1;
static gint ett_charset_subopt = -1;
static gint ett_rsp_subopt = -1;
static gint ett_comport_subopt = -1;
static gint ett_starttls_subopt = -1;
static expert_field ei_telnet_suboption_length = EI_INIT;
static expert_field ei_telnet_invalid_subcommand = EI_INIT;
static expert_field ei_telnet_invalid_linestate = EI_INIT;
static expert_field ei_telnet_invalid_stop = EI_INIT;
static expert_field ei_telnet_enc_cmd_unknown = EI_INIT;
static expert_field ei_telnet_invalid_data_size = EI_INIT;
static expert_field ei_telnet_invalid_modemstate = EI_INIT;
static expert_field ei_telnet_invalid_parity = EI_INIT;
static expert_field ei_telnet_kerberos_blob_too_long = EI_INIT;
static expert_field ei_telnet_invalid_purge = EI_INIT;
static expert_field ei_telnet_invalid_baud_rate = EI_INIT;
static expert_field ei_telnet_invalid_control = EI_INIT;
static dissector_handle_t telnet_handle;
static dissector_handle_t tn3270_handle;
static dissector_handle_t tn5250_handle;
static dissector_handle_t ssl_handle;
/* Some defines for Telnet */
#define TCP_PORT_TELNET 23
#define TN_IAC 255
#define TN_DONT 254
#define TN_DO 253
#define TN_WONT 252
#define TN_WILL 251
#define TN_SB 250
#define TN_GA 249
#define TN_EL 248
#define TN_EC 247
#define TN_AYT 246
#define TN_AO 245
#define TN_IP 244
#define TN_BRK 243
#define TN_DM 242
#define TN_NOP 241
#define TN_SE 240
#define TN_EOR 239
#define TN_ABORT 238
#define TN_SUSP 237
#define TN_EOF 236
#define TN_ARE 1
static const value_string cmd_vals[] = {
{ TN_EOF, "End of File" },
{ TN_SUSP, "Suspend Current Process" },
{ TN_ABORT, "Abort Process" },
{ TN_EOR, "End of Record" },
{ TN_SE, "Suboption End" },
{ TN_NOP, "No Operation" },
{ TN_DM, "Data Mark" },
{ TN_BRK, "Break" },
{ TN_IP, "Interrupt Process" },
{ TN_AO, "Abort Output" },
{ TN_AYT, "Are You There?" },
{ TN_EC, "Escape Character" },
{ TN_EL, "Erase Line" },
{ TN_GA, "Go Ahead" },
{ TN_DONT, "Don't" },
{ TN_DO, "Do" },
{ TN_WONT, "Won't" },
{ TN_WILL, "Will" },
{ TN_SB, "Suboption" },
{ 0, NULL }
};
typedef enum {
NO_LENGTH, /* option has no data, hence no length */
FIXED_LENGTH, /* option always has the same length */
VARIABLE_LENGTH /* option is variable-length - optlen is minimum */
} tn_opt_len_type;
/* Member of table of IP or TCP options. */
typedef struct tn_opt {
const char *name; /* name of option */
gint *subtree_index; /* pointer to subtree index for option */
tn_opt_len_type len_type; /* type of option length field */
int optlen; /* value length should be (minimum if VARIABLE) */
void (*dissect)(packet_info *pinfo, const char *, tvbuff_t *, int, int, proto_tree *, proto_item*);
/* routine to dissect option */
} tn_opt;
typedef struct _telnet_conv_info {
guint32 starttls_requested_in; /* Frame of first sender of START_TLS FOLLOWS */
guint32 starttls_port; /* Source port for first sender */
} telnet_conv_info_t;
static void
check_tn3270_model(packet_info *pinfo _U_, const char *terminaltype)
{
int model;
if ((strcmp(terminaltype,"IBM-3278-2-E") == 0) || (strcmp(terminaltype,"IBM-3278-2") == 0) ||
(strcmp(terminaltype,"IBM-3278-3") == 0) || (strcmp(terminaltype,"IBM-3278-4") == 0) ||
(strcmp(terminaltype,"IBM-3278-5") == 0) || (strcmp(terminaltype,"IBM-3277-2") == 0) ||
(strcmp(terminaltype,"IBM-3279-3") == 0) || (strcmp(terminaltype,"IBM-3279-4") == 0) ||
(strcmp(terminaltype,"IBM-3279-2-E") == 0) || (strcmp(terminaltype,"IBM-3279-2") == 0) ||
(strcmp(terminaltype,"IBM-3279-4-E") == 0)) {
model = terminaltype[9] - '0';
add_tn3270_conversation(pinfo, 0, model);
}
}
static void
check_for_tn3270(packet_info *pinfo _U_, const char *optname, const char *terminaltype)
{
if (strcmp(optname,"Terminal Type") != 0) {
return;
}
check_tn3270_model(pinfo, terminaltype);
if ((strcmp(terminaltype,"IBM-5555-C01") == 0) || /* 24 x 80 Double-Byte Character Set color display */
(strcmp(terminaltype,"IBM-5555-B01") == 0) || /* 24 x 80 Double-Byte Character Set (DBCS)*/
(strcmp(terminaltype,"IBM-3477-FC") == 0) || /* 27 x 132 color display*/
(strcmp(terminaltype,"IBM-3477-FG") == 0) || /* 27 x 132 monochrome display*/
(strcmp(terminaltype,"IBM-3180-2") == 0) || /* 27 x 132 monochrome display*/
(strcmp(terminaltype,"IBM-3179-2") == 0) || /* 24 x 80 color display*/
(strcmp(terminaltype,"IBM-3196-A1") == 0) || /* 24 x 80 monochrome display*/
(strcmp(terminaltype,"IBM-5292-2") == 0) || /* 24 x 80 color display*/
(strcmp(terminaltype,"IBM-5291-1") == 0) || /* 24 x 80 monochrome display*/
(strcmp(terminaltype,"IBM-5251-11") == 0)) /* 24 x 80 monochrome display*/
add_tn5250_conversation(pinfo, 0);
}
static telnet_conv_info_t *
telnet_get_session(packet_info *pinfo)
{
conversation_t *conversation = find_or_create_conversation(pinfo);
telnet_conv_info_t *telnet_info;
telnet_info = (telnet_conv_info_t*)conversation_get_proto_data(conversation, proto_telnet);
if (!telnet_info) {
telnet_info = wmem_new0(wmem_file_scope(), telnet_conv_info_t);
conversation_add_proto_data(conversation, proto_telnet, telnet_info);
}
return telnet_info;
}
static void
dissect_string_subopt(packet_info *pinfo, const char *optname, tvbuff_t *tvb, int offset, int len,
proto_tree *tree, proto_item *item)
{
guint8 cmd;
cmd = tvb_get_guint8(tvb, offset);
switch (cmd) {
case 0: /* IS */
proto_tree_add_uint_format(tree, hf_telnet_subcmd, tvb, offset, 1, cmd, "Here's my %s", optname);
offset++;
len--;
if (len > 0) {
proto_tree_add_item(tree, hf_telnet_string_subopt_value, tvb, offset, len, ENC_NA|ENC_ASCII);
}
check_for_tn3270(pinfo, optname, tvb_format_text(tvb, offset, len));
break;
case 1: /* SEND */
proto_tree_add_uint_format(tree, hf_telnet_subcmd, tvb, offset, 1, cmd, "Send your %s", optname);
offset++;
len--;
if (len > 0)
proto_tree_add_bytes_format(tree, hf_telnet_subcommand_data, tvb, offset, len, NULL, "Extra data");
break;
default:
expert_add_info_format(pinfo, item, &ei_telnet_invalid_subcommand, "Invalid %s subcommand %u", optname, cmd);
offset++;
len--;
if (len > 0)
proto_tree_add_item(tree, hf_telnet_subcommand_data, tvb, offset, len, ENC_NA);
break;
}
}
static void
dissect_tn3270_regime_subopt(packet_info *pinfo, const char *optname _U_, tvbuff_t *tvb, int offset,
int len, proto_tree *tree, proto_item *item _U_)
{
#define TN3270_REGIME_ARE 0x01
#define TN3270_REGIME_IS 0x00
guint8 cmd;
while (len > 0) {
cmd = tvb_get_guint8(tvb, offset);
switch (cmd) {
case TN3270_REGIME_ARE:
case TN3270_REGIME_IS:
if (cmd == TN3270_REGIME_ARE) {
proto_tree_add_uint_format(tree, hf_tn3270_regime_cmd, tvb, offset, 1, cmd, "ARE");
add_tn3270_conversation(pinfo, 0, 0);
} else {
proto_tree_add_uint_format(tree, hf_tn3270_regime_cmd, tvb, offset, 1, cmd, "IS");
}
proto_tree_add_item(tree, hf_tn3270_regime_subopt_value, tvb, offset + 1, len - 1, ENC_NA|ENC_ASCII);
return;
default:
proto_tree_add_uint_format(tree, hf_tn3270_regime_cmd, tvb, offset, 1, cmd, "Bogus value: %u", cmd);
break;
}
offset++;
len --;
}
}
#define TN3270_ASSOCIATE 0x00
#define TN3270_CONNECT 0x01
#define TN3270_DEVICE_TYPE 0x02
#define TN3270_FUNCTIONS 0x03
#define TN3270_IS 0x04
#define TN3270_REASON 0x05
#define TN3270_REJECT 0x06
#define TN3270_REQUEST 0x07
#define TN3270_SEND 0x08
/* Reason_codes*/
#define TN3270_CONN_PARTNER 0x00
#define TN3270_DEVICE_IN_USE 0x01
#define TN3270_INV_ASSOCIATE 0x02
#define TN3270_INV_DEVICE_NAME 0x03
#define TN3270_INV_DEVICE_TYPE 0x04
#define TN3270_TYPE_NAME_ERROR 0x05
#define TN3270_UNKNOWN_ERROR 0x06
#define TN3270_UNSUPPORTED_REQ 0x07
/* Function Names*/
#define TN3270_BIND_IMAGE 0x00
#define TN3270_DATA_STREAM_CTL 0x01
#define TN3270_RESPONSES 0x02
#define TN3270_SCS_CTL_CODES 0x03
#define TN3270_SYSREQ 0x04
static const value_string tn3270_subopt_vals[] = {
{ TN3270_ASSOCIATE, "ASSOCIATE" },
{ TN3270_CONNECT, "CONNECT" },
{ TN3270_DEVICE_TYPE, "DEVICE-TYPE" },
{ TN3270_FUNCTIONS, "FUNCTIONS" },
{ TN3270_IS, "IS" },
{ TN3270_REASON, "REASON" },
{ TN3270_REJECT, "REJECT" },
{ TN3270_REQUEST, "REQUEST" },
{ TN3270_SEND, "SEND" },
{ 0, NULL }
};
static const value_string tn3270_reason_vals[] = {
{ TN3270_CONN_PARTNER, "CONN-PARTNER" },
{ TN3270_DEVICE_IN_USE, "DEVICE-IN-USE" },
{ TN3270_INV_ASSOCIATE, "INV-ASSOCIATE" },
{ TN3270_INV_DEVICE_NAME, "INV-DEVICE-NAME" },
{ TN3270_INV_DEVICE_TYPE, "INV-DEVICE-TYPE" },
{ TN3270_TYPE_NAME_ERROR, "TYPE-NAME-ERROR" },
{ TN3270_UNKNOWN_ERROR, "UNKNOWN-ERROR" },
{ TN3270_UNSUPPORTED_REQ, "UNSUPPORTED-REQ" },
{ 0, NULL }
};
static const value_string tn3270_request_vals[] = {
{ TN3270_BIND_IMAGE, "BIND-IMAGE" },
{ TN3270_DATA_STREAM_CTL, "DATA-STREAM-CTL" },
{ TN3270_RESPONSES, "RESPONSES" },
{ TN3270_SCS_CTL_CODES, "SCS-CTL-CODES" },
{ TN3270_SYSREQ, "SYSREQ" },
{ 0, NULL }
};
static void
dissect_tn3270e_subopt(packet_info *pinfo _U_, const char *optname _U_, tvbuff_t *tvb, int offset,
int len, proto_tree *tree, proto_item *item _U_)
{
guint8 cmd;
int datalen;
int connect_offset = 0;
int device_type = 0;
int rsn = 0;
while (len > 0) {
cmd = tvb_get_guint8(tvb, offset);
proto_tree_add_item( tree, hf_tn3270_subopt, tvb, offset, 1, ENC_BIG_ENDIAN );
switch (cmd) {
case TN3270_CONNECT:
proto_tree_add_item( tree, hf_tn3270_connect, tvb, offset + 1, len, ENC_NA|ENC_ASCII );
offset += (len - 1);
len -= (len - 1);
break;
case TN3270_IS:
device_type = tvb_get_guint8(tvb, offset-1);
if (device_type == TN3270_DEVICE_TYPE) {
/* If there is a terminal type to display, then it will be followed by CONNECT */
connect_offset = tvb_find_guint8(tvb, offset + 1, len, TN3270_CONNECT);
if (connect_offset != -1) {
datalen = connect_offset - (offset + 1);
if (datalen > 0) {
proto_tree_add_item( tree, hf_tn3270_is, tvb, offset + 1, datalen, ENC_NA|ENC_ASCII );
check_tn3270_model(pinfo, tvb_format_text(tvb, offset + 1, datalen));
offset += datalen;
len -= datalen;
}
}
}
break;
case TN3270_REASON:
offset++;
len--;
proto_tree_add_item( tree, hf_tn3270_reason, tvb, offset, 1, ENC_BIG_ENDIAN );
break;
case TN3270_REQUEST:
add_tn3270_conversation(pinfo, 1, 0);
device_type = tvb_get_guint8(tvb, offset-1);
if (device_type == TN3270_DEVICE_TYPE) {
proto_tree_add_item( tree, hf_tn3270_request_string, tvb, offset + 1, len-1, ENC_NA|ENC_ASCII );
offset += (len - 1);
len -= (len - 1);
}else if (device_type == TN3270_FUNCTIONS) {
while (len > 0) {
rsn = tvb_get_guint8(tvb, offset);
proto_tree_add_item( tree, hf_tn3270_request, tvb, offset, 1, ENC_BIG_ENDIAN );
if (try_val_to_str(rsn, tn3270_request_vals) == NULL)
break;
offset++;
len--;
}
}
break;
}
offset++;
len--;
}
}
static void
dissect_starttls_subopt(packet_info *pinfo _U_, const char *optname _U_, tvbuff_t *tvb, int offset,
int len _U_, proto_tree *tree, proto_item *item _U_)
{
telnet_conv_info_t *session = telnet_get_session(pinfo);
proto_tree_add_item(tree, hf_telnet_starttls, tvb, offset, 1, ENC_BIG_ENDIAN);
if (session->starttls_requested_in == 0) {
/* First sender (client or server) requesting to start TLS. */
session->starttls_requested_in = pinfo->num;
session->starttls_port = pinfo->srcport;
} else if (session->starttls_requested_in < pinfo->num &&
session->starttls_port != pinfo->srcport) {
/* Other side confirms that following data is TLS. */
ssl_starttls_ack(ssl_handle, pinfo, telnet_handle);
}
}
static const value_string telnet_outmark_subopt_cmd_vals[] = {
{ '\x06', "ACK" },
{ '\x15', "NAK" },
{ 'D', "Default" },
{ 'T', "Top" },
{ 'B', "Bottom" },
{ 'L', "Left" },
{ 'R', "Right" },
{ 0, NULL }
};
static void
dissect_outmark_subopt(packet_info *pinfo _U_, const char *optname _U_, tvbuff_t *tvb, int offset,
int len, proto_tree *tree, proto_item *item _U_)
{
int gs_offset, datalen;
while (len > 0) {
proto_tree_add_item(tree, hf_telnet_outmark_subopt_cmd, tvb, offset, 1, ENC_ASCII | ENC_NA);
offset++;
len--;
/* Look for a GS */
gs_offset = tvb_find_guint8(tvb, offset, len, 29);
if (gs_offset == -1) {
/* None found - run to the end of the packet. */
gs_offset = offset + len;
}
datalen = gs_offset - offset;
if (datalen > 0) {
proto_tree_add_item(tree, hf_telnet_outmark_subopt_banner, tvb, offset, datalen, ENC_NA|ENC_ASCII);
offset += datalen;
len -= datalen;
}
}
}
static void
dissect_htstops_subopt(packet_info *pinfo, const char *optname, tvbuff_t *tvb, int offset, int len,
proto_tree *tree, proto_item *item)
{
guint8 cmd;
guint8 tabval;
cmd = tvb_get_guint8(tvb, offset);
switch (cmd) {
case 0: /* IS */
proto_tree_add_uint_format(tree, hf_telnet_subcmd, tvb, offset, 1, cmd, "Here's my %s", optname);
offset++;
len--;
break;
case 1: /* SEND */
proto_tree_add_uint_format(tree, hf_telnet_subcmd, tvb, offset, 1, cmd, "Send your %s", optname);
offset++;
len--;
break;
default:
expert_add_info_format(pinfo, item, &ei_telnet_invalid_subcommand, "Invalid %s subcommand %u", optname, cmd);
offset++;
len--;
if (len > 0)
proto_tree_add_item(tree, hf_telnet_subcommand_data, tvb, offset, len, ENC_NA);
return;
}
while (len > 0) {
tabval = tvb_get_guint8(tvb, offset);
switch (tabval) {
case 0:
proto_tree_add_uint_format(tree, hf_telnet_tabstop, tvb, offset, 1,
tabval, "Sender wants to handle tab stops");
break;
default:
proto_tree_add_uint_format(tree, hf_telnet_tabstop, tvb, offset, 1,
tabval, "Sender wants receiver to handle tab stop at %u",
tabval);
break;
case 251:
case 252:
case 253:
case 254:
proto_tree_add_uint_format(tree, hf_telnet_tabstop, tvb, offset, 1,
tabval, "Invalid value: %u", tabval);
break;
case 255:
proto_tree_add_uint_format(tree, hf_telnet_tabstop, tvb, offset, 1,
tabval, "Sender wants receiver to handle tab stops");
break;
}
offset++;
len--;
}
}
static void
dissect_naws_subopt(packet_info *pinfo _U_, const char *optname _U_, tvbuff_t *tvb, int offset,
int len _U_, proto_tree *tree, proto_item *item _U_)
{
proto_tree_add_item(tree, hf_telnet_naws_subopt_width, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(tree, hf_telnet_naws_subopt_height, tvb, offset, 2, ENC_BIG_ENDIAN);
}
/* BEGIN RFC-2217 (COM Port Control) Definitions */
#define TNCOMPORT_SIGNATURE 0
#define TNCOMPORT_SETBAUDRATE 1
#define TNCOMPORT_SETDATASIZE 2
#define TNCOMPORT_SETPARITY 3
#define TNCOMPORT_SETSTOPSIZE 4
#define TNCOMPORT_SETCONTROL 5
#define TNCOMPORT_NOTIFYLINESTATE 6
#define TNCOMPORT_NOTIFYMODEMSTATE 7
#define TNCOMPORT_FLOWCONTROLSUSPEND 8
#define TNCOMPORT_FLOWCONTROLRESUME 9
#define TNCOMPORT_SETLINESTATEMASK 10
#define TNCOMPORT_SETMODEMSTATEMASK 11
#define TNCOMPORT_PURGEDATA 12
/* END RFC-2217 (COM Port Control) Definitions */
static void
dissect_comport_subopt(packet_info *pinfo, const char *optname, tvbuff_t *tvb, int offset, int len,
proto_tree *tree, proto_item *item)
{
static const char *datasizes[] = {
"Request",
"<invalid>",
"<invalid>",
"<invalid>",
"<invalid>",
"5",
"6",
"7",
"8"
};
static const char *parities[] = {
"Request",
"None",
"Odd",
"Even",
"Mark",
"Space"
};
static const char *stops[] = {
"Request",
"1",
"2",
"1.5"
};
static const char *control[] = {
"Output Flow Control Request",
"Output Flow: None",
"Output Flow: XON/XOFF",
"Output Flow: CTS/RTS",
"Break Request",
"Break: ON",
"Break: OFF",
"DTR Request",
"DTR: ON",
"DTR: OFF",
"RTS Request",
"RTS: ON",
"RTS: OFF",
"Input Flow Control Request",
"Input Flow: None",
"Input Flow: XON/XOFF",
"Input Flow: CTS/RTS",
"Output Flow: DCD",
"Input Flow: DTR",
"Output Flow: DSR"
};
static const char *linestate_bits[] = {
"Data Ready",
"Overrun Error",
"Parity Error",
"Framing Error",
"Break Detected",
"Transfer Holding Register Empty",
"Transfer Shift Register Empty",
"Timeout Error"
};
static const char *modemstate_bits[] = {
"DCTS",
"DDSR",
"TERI",
"DDCD",
"CTS",
"DSR",
"RI",
"DCD"
};
static const char *purges[] = {
"Purge None",
"Purge RX",
"Purge TX",
"Purge RX/TX"
};
guint8 cmd;
guint8 isservercmd;
const char *source;
cmd = tvb_get_guint8(tvb, offset);
isservercmd = cmd > 99;
cmd = (isservercmd) ? (cmd - 100) : cmd;
source = (isservercmd) ? "Server" : "Client";
switch (cmd) {
case TNCOMPORT_SIGNATURE:
len--;
if (len == 0) {
proto_tree_add_string_format(tree, hf_telnet_comport_subopt_signature, tvb, offset, 1, "", "%s Requests Signature", source);
} else {
guint8 *sig = tvb_get_string_enc(wmem_packet_scope(), tvb, offset + 1, len, ENC_ASCII);
proto_tree_add_string_format(tree, hf_telnet_comport_subopt_signature, tvb, offset, 1 + len, sig,
"%s Signature: %s",source, sig);
}
break;
case TNCOMPORT_SETBAUDRATE:
len--;
if (len >= 4) {
guint32 baud = tvb_get_ntohl(tvb, offset+1);
if (baud == 0) {
proto_tree_add_uint_format_value(tree, hf_telnet_comport_subopt_baud_rate, tvb, offset, 5, 0, "%s Requests Baud Rate",source);
} else {
proto_tree_add_uint_format_value(tree, hf_telnet_comport_subopt_baud_rate, tvb, offset, 5, baud, "%s Baud Rate: %d",source,baud);
}
} else {
expert_add_info_format(pinfo, item, &ei_telnet_invalid_baud_rate, "%s <Invalid Baud Rate Packet>", source);
}
break;
case TNCOMPORT_SETDATASIZE:
len--;
if (len >= 1) {
guint8 datasize = tvb_get_guint8(tvb, offset+1);
const char *ds = (datasize > 8) ? "<invalid>" : datasizes[datasize];
proto_tree_add_uint_format_value(tree, hf_telnet_comport_subopt_data_size, tvb, offset, 2, datasize,
"%s Data Size: %s",source,ds);
} else {
expert_add_info_format(pinfo, item, &ei_telnet_invalid_data_size, "%s <Invalid Data Size Packet>", source);
}
break;
case TNCOMPORT_SETPARITY:
len--;
if (len >= 1) {
guint8 parity = tvb_get_guint8(tvb, offset+1);
const char *pr = (parity > 5) ? "<invalid>" : parities[parity];
proto_tree_add_uint_format_value(tree, hf_telnet_comport_subopt_parity, tvb, offset, 2, parity,
"%s Parity: %s",source,pr);
} else {
expert_add_info_format(pinfo, item, &ei_telnet_invalid_parity, "%s <Invalid Parity Packet>", source);
}
break;
case TNCOMPORT_SETSTOPSIZE:
len--;
if (len >= 1) {
guint8 stop = tvb_get_guint8(tvb, offset+1);
const char *st = (stop > 3) ? "<invalid>" : stops[stop];
proto_tree_add_uint_format_value(tree, hf_telnet_comport_subopt_stop, tvb, offset, 2, stop,
"%s Stop: %s",source,st);
} else {
expert_add_info_format(pinfo, item, &ei_telnet_invalid_stop, "%s <Invalid Stop Packet>", source);
}
break;
case TNCOMPORT_SETCONTROL:
len--;
if (len >= 1) {
guint8 crt = tvb_get_guint8(tvb, offset+1);
const char *c = (crt > 19) ? "Control: <invalid>" : control[crt];
proto_tree_add_uint_format_value(tree, hf_telnet_comport_subopt_control, tvb, offset, 2, crt,
"%s Stop: %s",source,c);
} else {
expert_add_info_format(pinfo, item, &ei_telnet_invalid_control, "%s <Invalid Control Packet>", source);
}
break;
case TNCOMPORT_SETLINESTATEMASK:
case TNCOMPORT_NOTIFYLINESTATE:
len--;
if (len >= 1) {
const char *print_pattern = (cmd == TNCOMPORT_SETLINESTATEMASK) ?
"%s Set Linestate Mask: %s" : "%s Linestate: %s";
int hf_line = (cmd == TNCOMPORT_SETLINESTATEMASK) ?
hf_telnet_comport_set_linestate_mask : hf_telnet_comport_linestate;
char ls_buffer[512];
guint8 ls = tvb_get_guint8(tvb, offset+1);
int print_count = 0;
int idx;
ls_buffer[0] = '\0';
for (idx = 0; idx < 8; idx++) {
int bit = ls & 1;
if (bit) {
if (print_count != 0) {
g_strlcat(ls_buffer,", ",512);
}
g_strlcat(ls_buffer,linestate_bits[idx], 512);
print_count++;
}
ls = ls >> 1;
}
proto_tree_add_string_format(tree, hf_line, tvb, offset, 2, ls_buffer, print_pattern, source, ls_buffer);
} else {
const char *print_pattern = (cmd == TNCOMPORT_SETLINESTATEMASK) ?
"%s <Invalid Linestate Mask>" : "%s <Invalid Linestate Packet>";
expert_add_info_format(pinfo, item, &ei_telnet_invalid_linestate, print_pattern, source);
}
break;
case TNCOMPORT_SETMODEMSTATEMASK:
case TNCOMPORT_NOTIFYMODEMSTATE:
len--;
if (len >= 1) {
const char *print_pattern = (cmd == TNCOMPORT_SETMODEMSTATEMASK) ?
"%s Set Modemstate Mask: %s" : "%s Modemstate: %s";
int hf_modem = (cmd == TNCOMPORT_SETMODEMSTATEMASK) ?
hf_telnet_comport_set_modemstate_mask : hf_telnet_comport_modemstate;
char ms_buffer[256];
guint8 ms = tvb_get_guint8(tvb, offset+1);
int print_count = 0;
int idx;
ms_buffer[0] = '\0';
for (idx = 0; idx < 8; idx++) {
int bit = ms & 1;
if (bit) {
if (print_count != 0) {
g_strlcat(ms_buffer,", ",256);
}
g_strlcat(ms_buffer,modemstate_bits[idx],256);
print_count++;
}
ms = ms >> 1;
}
proto_tree_add_string_format(tree, hf_modem, tvb, offset, 2, ms_buffer, print_pattern, source, ms_buffer);
} else {
const char *print_pattern = (cmd == TNCOMPORT_SETMODEMSTATEMASK) ?
"%s <Invalid Modemstate Mask>" : "%s <Invalid Modemstate Packet>";
expert_add_info_format(pinfo, item, &ei_telnet_invalid_modemstate, print_pattern, source);
}
break;
case TNCOMPORT_FLOWCONTROLSUSPEND:
len--;
proto_tree_add_none_format(tree, hf_telnet_comport_subopt_flow_control_suspend, tvb, offset, 1, "%s Flow Control Suspend",source);
break;
case TNCOMPORT_FLOWCONTROLRESUME:
len--;
proto_tree_add_none_format(tree, hf_telnet_comport_subopt_flow_control_resume, tvb, offset, 1, "%s Flow Control Resume",source);
break;
case TNCOMPORT_PURGEDATA:
len--;
if (len >= 1) {
guint8 purge = tvb_get_guint8(tvb, offset+1);
const char *p = (purge > 3) ? "<Purge invalid>" : purges[purge];
proto_tree_add_uint_format_value(tree, hf_telnet_comport_subopt_purge, tvb, offset, 2, purge,
"%s %s",source,p);
} else {
expert_add_info_format(pinfo, item, &ei_telnet_invalid_purge, "%s <Invalid Purge Packet>", source);
}
break;
default:
expert_add_info_format(pinfo, item, &ei_telnet_invalid_subcommand, "Invalid %s subcommand %u", optname, cmd);
offset++;
len--;
if (len > 0)
proto_tree_add_item(tree, hf_telnet_subcommand_data, tvb, offset, len, ENC_NA);
return;
}
}
static const value_string rfc_opt_vals[] = {
{ 0, "OFF" },
{ 1, "ON" },
{ 2, "RESTART-ANY" },
{ 3, "RESTART-XON" },
{ 0, NULL }
};
static void
dissect_rfc_subopt(packet_info *pinfo _U_, const char *optname _U_, tvbuff_t *tvb, int offset,
int len _U_, proto_tree *tree, proto_item *item _U_)
{
proto_tree_add_item(tree, hf_telnet_rfc_subopt_cmd, tvb, offset, 1, ENC_BIG_ENDIAN);
}
#define TN_ENC_IS 0
#define TN_ENC_SUPPORT 1
#define TN_ENC_REPLY 2
#define TN_ENC_START 3
#define TN_ENC_END 4
#define TN_ENC_REQUEST_START 5
#define TN_ENC_REQUEST_END 6
#define TN_ENC_ENC_KEYID 7
#define TN_ENC_DEC_KEYID 8
static const value_string enc_cmd_vals[] = {
{ TN_ENC_IS, "IS" },
{ TN_ENC_SUPPORT, "SUPPORT" },
{ TN_ENC_REPLY, "REPLY" },
{ TN_ENC_START, "START" },
{ TN_ENC_END, "END" },
{ TN_ENC_REQUEST_START, "REQUEST-START" },
{ TN_ENC_REQUEST_END, "REQUEST-END" },
{ TN_ENC_ENC_KEYID, "ENC_KEYID" },
{ TN_ENC_DEC_KEYID, "DEC_KEYID" },
{ 0, NULL }
};
#define TN_ENCTYPE_NULL 0
#define TN_ENCTYPE_DES_CFB64 1
#define TN_ENCTYPE_DES_OFB64 2
#define TN_ENCTYPE_DES3_CFB64 3
#define TN_ENCTYPE_DES3_OFB64 4
#define TN_ENCTYPE_CAST5_40_CFB64 8
#define TN_ENCTYPE_CAST5_40_OFB64 9
#define TN_ENCTYPE_CAST128_CFB64 10
#define TN_ENCTYPE_CAST128_OFB64 11
static const value_string enc_type_vals[] = {
{ TN_ENCTYPE_NULL, "NULL" },
{ TN_ENCTYPE_DES_CFB64, "DES_CFB64" },
{ TN_ENCTYPE_DES_OFB64, "DES_OFB64" },
{ TN_ENCTYPE_DES3_CFB64, "DES3_CFB64" },
{ TN_ENCTYPE_DES3_OFB64, "DES3_OFB64" },
{ TN_ENCTYPE_CAST5_40_CFB64, "CAST5_40_CFB64" },
{ TN_ENCTYPE_CAST5_40_OFB64, "CAST5_40_OFB64" },
{ TN_ENCTYPE_CAST128_CFB64, "CAST128_CFB64" },
{ TN_ENCTYPE_CAST128_OFB64, "CAST128_OFB64" },
{ 0, NULL }
};
#define TN_AC_IS 0
#define TN_AC_SEND 1
#define TN_AC_REPLY 2
#define TN_AC_NAME 3
static const value_string auth_cmd_vals[] = {
{ TN_AC_IS, "IS" },
{ TN_AC_SEND, "SEND" },
{ TN_AC_REPLY, "REPLY" },
{ TN_AC_NAME, "NAME" },
{ 0, NULL }
};
#define TN_AT_NULL 0
#define TN_AT_KRB4 1
#define TN_AT_KRB5 2
#define TN_AT_SPX 3
#define TN_AT_MINK 4
#define TN_AT_SRP 5
#define TN_AT_RSA 6
#define TN_AT_SSL 7
#define TN_AT_LOKI 10
#define TN_AT_SSA 11
#define TN_AT_KEA_SJ 12
#define TN_AT_KEA_SJ_INTEG 13
#define TN_AT_DSS 14
#define TN_AT_NTLM 15
static const value_string auth_type_vals[] = {
{ TN_AT_NULL, "NULL" },
{ TN_AT_KRB4, "Kerberos v4" },
{ TN_AT_KRB5, "Kerberos v5" },
{ TN_AT_SPX, "SPX" },
{ TN_AT_MINK, "MINK" },
{ TN_AT_SRP, "SRP" },
{ TN_AT_RSA, "RSA" },
{ TN_AT_SSL, "SSL" },
{ TN_AT_LOKI, "LOKI" },
{ TN_AT_SSA, "SSA" },
{ TN_AT_KEA_SJ, "KEA_SJ" },
{ TN_AT_KEA_SJ_INTEG, "KEA_SJ_INTEG" },
{ TN_AT_DSS, "DSS" },
{ TN_AT_NTLM, "NTLM" },
{ 0, NULL }
};
static const true_false_string auth_mod_cred_fwd = {
"Client WILL forward auth creds",
"Client will NOT forward auth creds"
};
static const true_false_string auth_mod_who = {
"Mask server to client",
"Mask client to server"
};
static const true_false_string auth_mod_how = {
"MUTUAL authentication",
"One Way authentication"
};
#define TN_AM_OFF 0x00
#define TN_AM_USING_TELOPT 0x01
#define TN_AM_AFTER_EXCHANGE 0x02
#define TN_AM_RESERVED 0x04
static const value_string auth_mod_enc[] = {
{ TN_AM_OFF, "Off" },
{ TN_AM_USING_TELOPT, "Telnet Options" },
{ TN_AM_AFTER_EXCHANGE, "After Exchange" },
{ TN_AM_RESERVED, "Reserved" },
{ 0, NULL }
};
#define TN_KRB5_TYPE_AUTH 0
#define TN_KRB5_TYPE_REJECT 1
#define TN_KRB5_TYPE_ACCEPT 2
#define TN_KRB5_TYPE_RESPONSE 3
#define TN_KRB5_TYPE_FORWARD 4
#define TN_KRB5_TYPE_FORWARD_ACCEPT 5
#define TN_KRB5_TYPE_FORWARD_REJECT 6
static const value_string auth_krb5_types[] = {
{ TN_KRB5_TYPE_AUTH, "Auth" },
{ TN_KRB5_TYPE_REJECT, "Reject" },
{ TN_KRB5_TYPE_ACCEPT, "Accept" },
{ TN_KRB5_TYPE_RESPONSE, "Response" },
{ TN_KRB5_TYPE_FORWARD, "Forward" },
{ TN_KRB5_TYPE_FORWARD_ACCEPT, "Forward Accept" },
{ TN_KRB5_TYPE_FORWARD_REJECT, "Forward Reject" },
{ 0, NULL }
};
static void
dissect_authentication_type_pair(packet_info *pinfo _U_, tvbuff_t *tvb, int offset, proto_tree *tree)
{
static const int * auth_mods[] = {
&hf_telnet_auth_mod_enc,
&hf_telnet_auth_mod_cred_fwd,
&hf_telnet_auth_mod_how,
&hf_telnet_auth_mod_who,
NULL
};
proto_tree_add_item(tree, hf_telnet_auth_type, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_bitmask_list(tree, tvb, offset+1, 1, auth_mods, ENC_BIG_ENDIAN);
}
/* no kerberos blobs are ever >10kb ? (arbitrary limit) */
#define MAX_KRB5_BLOB_LEN 10240
static tvbuff_t *
unescape_and_tvbuffify_telnet_option(packet_info *pinfo, tvbuff_t *tvb, int offset, int len)
{
tvbuff_t *krb5_tvb;
guint8 *buf;
const guint8 *spos;
guint8 *dpos;
int skip, l;
if(len>=MAX_KRB5_BLOB_LEN)
return NULL;
spos=tvb_get_ptr(tvb, offset, len);
buf=(guint8 *)wmem_alloc(pinfo->pool, len);
dpos=buf;
skip=0;
l=len;
while(l>0){
if((spos[0]==0xff) && (spos[1]==0xff)){
skip++;
l-=2;
*(dpos++)=0xff;
spos+=2;
continue;
}
*(dpos++)=*(spos++);
l--;
}
krb5_tvb = tvb_new_child_real_data(tvb, buf, len-skip, len-skip);
add_new_data_source(pinfo, krb5_tvb, "Unpacked Telnet Option");
return krb5_tvb;
}
/* as per RFC2942 */
static void
dissect_krb5_authentication_data(packet_info *pinfo, tvbuff_t *tvb, int offset, int len, proto_tree *tree, guint8 acmd)
{
tvbuff_t *krb5_tvb;
guint8 krb5_cmd;
proto_item* ti;
dissect_authentication_type_pair(pinfo, tvb, offset, tree);
offset+=2;
len-=2;
krb5_cmd=tvb_get_guint8(tvb, offset);
ti = proto_tree_add_uint(tree, hf_telnet_auth_krb5_type, tvb, offset, 1, krb5_cmd);
offset++;
len--;
/* IAC SB AUTHENTICATION IS <authentication-type-pair> AUTH <Kerberos V5 KRB_AP_REQ message> IAC SE */
if((acmd==TN_AC_IS)&&(krb5_cmd==TN_KRB5_TYPE_AUTH)){
if(len){
krb5_tvb=unescape_and_tvbuffify_telnet_option(pinfo, tvb, offset, len);
if(krb5_tvb)
dissect_kerberos_main(krb5_tvb, pinfo, tree, FALSE, NULL);
else
expert_add_info_format(pinfo, ti, &ei_telnet_kerberos_blob_too_long, "Kerberos blob (too long to dissect - length %u > %u)", len, MAX_KRB5_BLOB_LEN);
}
}
/* IAC SB AUTHENTICATION REPLY <authentication-type-pair> ACCEPT IAC SE */
/* nothing more to dissect */
/* IAC SB AUTHENTICATION REPLY <authentication-type-pair> REJECT <optional reason for rejection> IAC SE*/
/*qqq*/
/* IAC SB AUTHENTICATION REPLY <authentication-type-pair> RESPONSE <KRB_AP_REP message> IAC SE */
if((acmd==TN_AC_REPLY)&&(krb5_cmd==TN_KRB5_TYPE_RESPONSE)){
if(len){
krb5_tvb=unescape_and_tvbuffify_telnet_option(pinfo, tvb, offset, len);
dissect_kerberos_main(krb5_tvb, pinfo, tree, FALSE, NULL);
}
}
/* IAC SB AUTHENTICATION <authentication-type-pair> FORWARD <KRB_CRED message> IAC SE */
/* XXX unclear what this one looks like */
/* IAC SB AUTHENTICATION <authentication-type-pair> FORWARD_ACCEPT IAC SE */
/* nothing more to dissect */
/* IAC SB AUTHENTICATION <authentication-type-pair> FORWARD_REJECT */
/* nothing more to dissect */
}
static void
dissect_authentication_subopt(packet_info *pinfo, const char *optname _U_, tvbuff_t *tvb, int offset, int len,
proto_tree *tree, proto_item *item _U_)
{
guint8 acmd;
/* XXX here we should really split it up in a conversation struct keeping
track of what method we actually use and not just assume it is always
kerberos v5
*/
acmd=tvb_get_guint8(tvb, offset);
proto_tree_add_uint(tree, hf_telnet_auth_cmd, tvb, offset, 1, acmd);
offset++;
len--;
switch(acmd){
case TN_AC_REPLY:
case TN_AC_IS:
/* XXX here we shouldn't just assume it is krb5 */
dissect_krb5_authentication_data(pinfo, tvb, offset, len, tree, acmd);
break;
case TN_AC_SEND:
while(len>0){
dissect_authentication_type_pair(pinfo, tvb, offset, tree);
offset+=2;
len-=2;
}
break;
case TN_AC_NAME:
proto_tree_add_item(tree, hf_telnet_auth_name, tvb, offset, len, ENC_ASCII|ENC_NA);
break;
}
}
/* This function only uses the octet in the buffer at 'offset' */
static void dissect_encryption_type(tvbuff_t *tvb, int offset, proto_tree *tree) {
guint8 etype;
etype = tvb_get_guint8(tvb, offset);
proto_tree_add_uint(tree, hf_telnet_enc_type, tvb, offset, 1, etype);
}
static void
dissect_encryption_subopt(packet_info *pinfo, const char *optname _U_, tvbuff_t *tvb, int offset, int len,
proto_tree *tree, proto_item *item)
{
guint8 ecmd, key_first_octet;
ecmd = tvb_get_guint8(tvb, offset);
proto_tree_add_uint(tree, hf_telnet_enc_cmd, tvb, offset, 1, ecmd);
offset++;
len--;
switch(ecmd) {
case TN_ENC_IS:
case TN_ENC_REPLY:
/* encryption type, type-specific data ... */
if (len > 0) {
dissect_encryption_type(tvb, offset, tree);
offset++;
len--;
proto_tree_add_item(tree, hf_telnet_enc_type_data, tvb, offset, len, ENC_NA);
}
break;
case TN_ENC_SUPPORT:
/* list of encryption types ... */
while (len > 0) {
dissect_encryption_type(tvb, offset, tree);
offset++;
len--;
}
break;
case TN_ENC_START:
/* keyid ... */
if (len > 0) {
key_first_octet = tvb_get_guint8(tvb, offset);
proto_tree_add_bytes_format(tree, hf_telnet_enc_key_id, tvb, offset, len, NULL, (key_first_octet == 0) ? "Default key" : "Key ID");
}
break;
case TN_ENC_END:
/* no data */
break;
case TN_ENC_REQUEST_START:
/* (optional) keyid */
if (len > 0)
proto_tree_add_bytes_format(tree, hf_telnet_enc_key_id, tvb, offset, len, NULL, "Key ID (advisory)");
break;
case TN_ENC_REQUEST_END:
/* no data */
break;
case TN_ENC_ENC_KEYID:
case TN_ENC_DEC_KEYID:
/* (optional) keyid - if not supplied, there are no more known keys */
if (len > 0)
proto_tree_add_item(tree, hf_telnet_enc_key_id, tvb, offset, len, ENC_NA);
break;
default:
expert_add_info(pinfo, item, &ei_telnet_enc_cmd_unknown);
}
}
static tn_opt options[] = {
{
"Binary Transmission", /* RFC 856 */
NULL, /* no suboption negotiation */
NO_LENGTH,
0,
NULL
},
{
"Echo", /* RFC 857 */
NULL, /* no suboption negotiation */
NO_LENGTH,
0,
NULL
},
{
"Reconnection", /* DOD Protocol Handbook */
NULL,
NO_LENGTH,
0,
NULL
},
{
"Suppress Go Ahead", /* RFC 858 */
NULL, /* no suboption negotiation */
NO_LENGTH,
0,
NULL
},
{
"Approx Message Size Negotiation", /* Ethernet spec(!) */
NULL,
NO_LENGTH,
0,
NULL
},
{
"Status", /* RFC 859 */
&ett_status_subopt,
VARIABLE_LENGTH,
1,
NULL /* XXX - fill me in */
},
{
"Timing Mark", /* RFC 860 */
NULL, /* no suboption negotiation */
NO_LENGTH,
0,
NULL
},
{
"Remote Controlled Trans and Echo", /* RFC 726 */
&ett_rcte_subopt,
VARIABLE_LENGTH,
1,
NULL /* XXX - fill me in */
},
{
"Output Line Width", /* DOD Protocol Handbook */
&ett_olw_subopt,
VARIABLE_LENGTH, /* XXX - fill me in */
0, /* XXX - fill me in */
NULL /* XXX - fill me in */
},
{
"Output Page Size", /* DOD Protocol Handbook */
&ett_ops_subopt,
VARIABLE_LENGTH, /* XXX - fill me in */
0, /* XXX - fill me in */
NULL /* XXX - fill me in */
},
{
"Output Carriage-Return Disposition", /* RFC 652 */
&ett_crdisp_subopt,
FIXED_LENGTH,
2,
NULL /* XXX - fill me in */
},
{
"Output Horizontal Tab Stops", /* RFC 653 */
&ett_htstops_subopt,
VARIABLE_LENGTH,
1,
dissect_htstops_subopt
},
{
"Output Horizontal Tab Disposition", /* RFC 654 */
&ett_htdisp_subopt,
FIXED_LENGTH,
2,
NULL /* XXX - fill me in */
},
{
"Output Formfeed Disposition", /* RFC 655 */
&ett_ffdisp_subopt,
FIXED_LENGTH,
2,
NULL /* XXX - fill me in */
},
{
"Output Vertical Tabstops", /* RFC 656 */
&ett_vtstops_subopt,
VARIABLE_LENGTH,
1,
NULL /* XXX - fill me in */
},
{
"Output Vertical Tab Disposition", /* RFC 657 */
&ett_vtdisp_subopt,
FIXED_LENGTH,
2,
NULL /* XXX - fill me in */
},
{
"Output Linefeed Disposition", /* RFC 658 */
&ett_lfdisp_subopt,
FIXED_LENGTH,
2,
NULL /* XXX - fill me in */
},
{
"Extended ASCII", /* RFC 698 */
&ett_extasc_subopt,
FIXED_LENGTH,
2,
NULL /* XXX - fill me in */
},
{
"Logout", /* RFC 727 */
NULL, /* no suboption negotiation */
NO_LENGTH,
0,
NULL
},
{
"Byte Macro", /* RFC 735 */
&ett_bytemacro_subopt,
VARIABLE_LENGTH,
2,
NULL /* XXX - fill me in */
},
{
"Data Entry Terminal", /* RFC 732, RFC 1043 */
&ett_det_subopt,
VARIABLE_LENGTH,
2,
NULL /* XXX - fill me in */
},
{
"SUPDUP", /* RFC 734, RFC 736 */
NULL, /* no suboption negotiation */
NO_LENGTH,
0,
NULL
},
{
"SUPDUP Output", /* RFC 749 */
&ett_supdupout_subopt,
VARIABLE_LENGTH,
1,
NULL /* XXX - fill me in */
},
{
"Send Location", /* RFC 779 */
&ett_sendloc_subopt,
VARIABLE_LENGTH,
0,
NULL /* XXX - fill me in */
},
{
"Terminal Type", /* RFC 1091 */
&ett_termtype_subopt,
VARIABLE_LENGTH,
1,
dissect_string_subopt
},
{
"End of Record", /* RFC 885 */
NULL, /* no suboption negotiation */
NO_LENGTH,
0,
NULL
},
{
"TACACS User Identification", /* RFC 927 */
&ett_tacacsui_subopt,
FIXED_LENGTH,
4,
NULL /* XXX - fill me in */
},
{
"Output Marking", /* RFC 933 */
&ett_outmark_subopt,
VARIABLE_LENGTH,
1,
dissect_outmark_subopt,
},
{
"Terminal Location Number", /* RFC 946 */
&ett_tlocnum_subopt,
VARIABLE_LENGTH,
1,
NULL /* XXX - fill me in */
},
{
"Telnet 3270 Regime", /* RFC 1041 */
&ett_tn3270reg_subopt,
VARIABLE_LENGTH,
1,
dissect_tn3270_regime_subopt
},
{
"X.3 PAD", /* RFC 1053 */
&ett_x3pad_subopt,
VARIABLE_LENGTH,
1,
NULL /* XXX - fill me in */
},
{
"Negotiate About Window Size", /* RFC 1073, DW183 */
&ett_naws_subopt,
FIXED_LENGTH,
4,
dissect_naws_subopt
},
{
"Terminal Speed", /* RFC 1079 */
&ett_tspeed_subopt,
VARIABLE_LENGTH,
1,
NULL /* XXX - fill me in */
},
{
"Remote Flow Control", /* RFC 1372 */
&ett_rfc_subopt,
FIXED_LENGTH,
1,
dissect_rfc_subopt
},
{
"Linemode", /* RFC 1184 */
&ett_linemode_subopt,
VARIABLE_LENGTH,
1,
NULL /* XXX - fill me in */
},
{
"X Display Location", /* RFC 1096 */
&ett_xdpyloc_subopt,
VARIABLE_LENGTH,
1,
dissect_string_subopt
},
{
"Environment Option", /* RFC 1408, RFC 1571 */
&ett_env_subopt,
VARIABLE_LENGTH,
1,
NULL /* XXX - fill me in */
},
{
"Authentication Option", /* RFC 2941 */
&ett_auth_subopt,
VARIABLE_LENGTH,
1,
dissect_authentication_subopt
},
{
"Encryption Option", /* RFC 2946 */
&ett_enc_subopt,
VARIABLE_LENGTH,
1,
dissect_encryption_subopt
},
{
"New Environment Option", /* RFC 1572 */
&ett_newenv_subopt,
VARIABLE_LENGTH,
1,
NULL /* XXX - fill me in */
},
{
"TN3270E", /* RFC 1647 */
&ett_tn3270e_subopt,
VARIABLE_LENGTH,
1,
dissect_tn3270e_subopt
},
{
"XAUTH", /* XAUTH */
&ett_xauth_subopt,
VARIABLE_LENGTH,
1,
NULL /* XXX - fill me in */
},
{
"CHARSET", /* CHARSET */
&ett_charset_subopt,
VARIABLE_LENGTH,
1,
NULL /* XXX - fill me in */
},
{
"Remote Serial Port", /* Remote Serial Port */
&ett_rsp_subopt,
VARIABLE_LENGTH,
1,
NULL /* XXX - fill me in */
},
{
"COM Port Control", /* RFC 2217 */
&ett_comport_subopt,
VARIABLE_LENGTH,
1,
dissect_comport_subopt
},
{
"Suppress Local Echo", /* draft-rfced-exp-atmar-00 */
NULL,
NO_LENGTH,
0,
NULL
},
{
"Start TLS", /* draft-ietf-tn3270e-telnet-tls-06 */
&ett_starttls_subopt,
FIXED_LENGTH,
1,
dissect_starttls_subopt
},
{
"KERMIT", /* RFC 2840 */
NULL,
VARIABLE_LENGTH,
1,
NULL /* XXX - stub */
},
{
"SEND-URL", /* draft-croft-telnet-url-trans-00 */
NULL,
VARIABLE_LENGTH,
1,
NULL /* XXX - stub */
},
{
"FORWARD_X", /* draft-altman-telnet-fwdx-03 */
NULL,
VARIABLE_LENGTH,
1,
NULL /* XXX - stub */
}
};
#define NOPTIONS array_length(options)
static int
telnet_sub_option(packet_info *pinfo, proto_tree *option_tree, proto_item *option_item, tvbuff_t *tvb, int start_offset)
{
int offset = start_offset;
guint8 opt_byte;
int subneg_len;
const char *opt;
int iac_offset;
guint len;
tvbuff_t *unescaped_tvb;
void (*dissect)(packet_info *, const char *, tvbuff_t *, int, int, proto_tree *, proto_item*);
gint cur_offset;
gboolean iac_found;
/*
* As data with value iac (0xff) is possible, this value must be escaped
* with iac (rfc 854).
*/
int iac_data = 0;
offset += 2; /* skip IAC and SB */
/* Get the option code */
opt_byte = tvb_get_guint8(tvb, offset);
if (opt_byte >= NOPTIONS) {
opt = "<unknown option>";
dissect = NULL;
} else {
opt = options[opt_byte].name;
dissect = options[opt_byte].dissect;
}
offset++;
/* Search for an unescaped IAC. */
cur_offset = offset;
len = tvb_reported_length_remaining(tvb, offset);
do {
iac_offset = tvb_find_guint8(tvb, cur_offset, len, TN_IAC);
iac_found = TRUE;
if (iac_offset == -1) {
/* None found - run to the end of the packet. */
offset += len;
} else {
if (((guint)(iac_offset + 1) >= len) ||
(tvb_get_guint8(tvb, iac_offset + 1) != TN_IAC)) {
/* We really found a single IAC, so we're done */
offset = iac_offset;
} else {
/*
* We saw an escaped IAC, so we have to move ahead to the
* next section
*/
iac_found = FALSE;
cur_offset = iac_offset + 2;
iac_data += 1;
}
}
} while (!iac_found);
subneg_len = offset - start_offset;
start_offset += 3; /* skip IAC, SB, and option code */
subneg_len -= 3;
if (subneg_len > 0) {
/* Now dissect the suboption parameters. */
if (dissect != NULL) {
switch (options[opt_byte].len_type) {
case NO_LENGTH:
/* There isn't supposed to *be* sub-option negotiation for this. */
expert_add_info_format(pinfo, option_item, &ei_telnet_suboption_length, "Bogus suboption data");
return offset;
case FIXED_LENGTH:
/* Make sure the length is what it's supposed to be. */
if (subneg_len - iac_data != options[opt_byte].optlen) {
expert_add_info_format(pinfo, option_item, &ei_telnet_suboption_length, "Suboption parameter length is %d, should be %d", subneg_len, options[opt_byte].optlen);
return offset;
}
break;
case VARIABLE_LENGTH:
/* Make sure the length is greater than the minimum. */
if (subneg_len - iac_data < options[opt_byte].optlen) {
expert_add_info_format(pinfo, option_item, &ei_telnet_suboption_length, "Suboption parameter length is %d, should be at least %d", subneg_len, options[opt_byte].optlen);
return offset;
}
break;
}
/* We have a dissector for this suboption's parameters; call it. */
if (iac_data > 0) {
/* Data is escaped, we have to unescape it. */
unescaped_tvb = unescape_and_tvbuffify_telnet_option(pinfo, tvb, start_offset, subneg_len);
(*dissect)(pinfo, opt, unescaped_tvb, 0, subneg_len - iac_data, option_tree, option_item);
} else {
(*dissect)(pinfo, opt, tvb, start_offset, subneg_len, option_tree, option_item);
}
} else {
/* We don't have a dissector for them; just show them as data. */
if (iac_data > 0) {
/* Data is escaped, we have to unescape it. */
unescaped_tvb = unescape_and_tvbuffify_telnet_option(pinfo, tvb, start_offset, subneg_len);
proto_tree_add_item(option_tree, hf_telnet_option_data, unescaped_tvb, 0, subneg_len - iac_data, ENC_NA);
} else {
proto_tree_add_item(option_tree, hf_telnet_option_data, tvb, start_offset, subneg_len, ENC_NA);
}
}
}
return offset;
}
static void
telnet_suboption_name(proto_tree *tree, tvbuff_t *tvb, int* offset, const gchar** optname,
proto_tree **opt_tree, proto_item **opt_item, const char *type)
{
guint8 opt_byte;
const char *opt;
gint ett = ett_telnet_subopt;
opt_byte = tvb_get_guint8(tvb, *offset);
if (opt_byte >= NOPTIONS) {
opt = "<unknown option>";
}
else {
opt = options[opt_byte].name;
if (options[opt_byte].subtree_index != NULL)
ett = *(options[opt_byte].subtree_index);
}
*opt_item = proto_tree_add_uint_format_value(tree, hf_telnet_subcmd, tvb, *offset, 1, opt_byte, "%s", opt);
*opt_tree = proto_item_add_subtree(*opt_item, ett);
(*offset)++;
(*optname) = wmem_strdup_printf(wmem_packet_scope(), "%s %s", type, opt);
}
static int
telnet_command(packet_info *pinfo, proto_tree *telnet_tree, tvbuff_t *tvb, int start_offset)
{
int offset = start_offset;
guchar optcode;
const gchar* optname;
proto_item *cmd_item, *subopt_item = NULL;
proto_tree *cmd_tree, *subopt_tree = NULL;
offset += 1; /* skip IAC */
optcode = tvb_get_guint8(tvb, offset);
cmd_tree = proto_tree_add_subtree(telnet_tree, tvb, start_offset, 2, ett_telnet_cmd, &cmd_item, "Command header");
proto_tree_add_item(cmd_tree, hf_telnet_cmd, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
switch(optcode) {
case TN_WILL:
telnet_suboption_name(cmd_tree, tvb, &offset, &optname, &subopt_tree, &subopt_item, "Will");
break;
case TN_WONT:
telnet_suboption_name(cmd_tree, tvb, &offset, &optname, &subopt_tree, &subopt_item, "Won't");
break;
case TN_DO:
telnet_suboption_name(cmd_tree, tvb, &offset, &optname, &subopt_tree, &subopt_item, "Do");
break;
case TN_DONT:
telnet_suboption_name(cmd_tree, tvb, &offset, &optname, &subopt_tree, &subopt_item, "Don't");
break;
case TN_SB:
telnet_suboption_name(cmd_tree, tvb, &offset, &optname, &subopt_tree, &subopt_item, "Suboption");
break;
default:
optname = val_to_str_const(optcode, cmd_vals, "<unknown option>");
break;
}
proto_item_set_text(cmd_item, "%s", optname);
if (optcode == TN_SB) {
offset = telnet_sub_option(pinfo, subopt_tree, subopt_item, tvb, start_offset);
}
proto_item_set_len(cmd_item, offset-start_offset);
return offset;
}
static void
telnet_add_text(proto_tree *tree, tvbuff_t *tvb, int offset, int len)
{
gint next_offset;
int linelen;
guint8 c;
gboolean last_char_was_cr;
while (len != 0 && tvb_offset_exists(tvb, offset)) {
/*
* Find the end of the line.
*/
linelen = tvb_find_line_end(tvb, offset, len, &next_offset, FALSE);
len -= next_offset - offset; /* subtract out the line's characters */
/*
* In Telnet, CR NUL is the way you send a CR by itself in the
* default ASCII mode; don't treat CR by itself as a line ending,
* treat only CR NUL, CR LF, or LF by itself as a line ending.
*/
if (next_offset == offset + linelen + 1 && len >= 1) {
/*
* Well, we saw a one-character line ending, so either it's a CR
* or an LF; we have at least two characters left, including the
* CR.
*
* If the line ending is a CR, skip all subsequent CRs; at
* least one capture appeared to have multiple CRs at the end of
* a line.
*/
if (tvb_get_guint8(tvb, offset + linelen) == '\r') {
last_char_was_cr = TRUE;
while (len != 0 && tvb_offset_exists(tvb, next_offset)) {
c = tvb_get_guint8(tvb, next_offset);
next_offset++; /* skip over that character */
len--;
if (c == '\n' || (c == '\0' && last_char_was_cr)) {
/*
* LF is a line ending, whether preceded by CR or not.
* NUL is a line ending if preceded by CR.
*/
break;
}
last_char_was_cr = (c == '\r');
}
}
}
/*
* Now compute the length of the line *including* the end-of-line
* indication, if any; we display it all.
*/
linelen = next_offset - offset;
proto_tree_add_item(tree, hf_telnet_data, tvb, offset, linelen, ENC_ASCII|ENC_NA);
offset = next_offset;
}
}
static int find_unescaped_iac(tvbuff_t *tvb, int offset, int len)
{
int iac_offset = offset;
/* If we find an IAC (0XFF), make sure it is not followed by another 0XFF.
Such cases indicate that it is not an IAC at all */
while ((iac_offset = tvb_find_guint8(tvb, iac_offset, len, TN_IAC)) != -1 &&
(tvb_get_guint8(tvb, iac_offset + 1) == TN_IAC))
{
iac_offset+=2;
len = tvb_reported_length_remaining(tvb, iac_offset);
}
return iac_offset;
}
static int
dissect_telnet(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_tree *telnet_tree, *ti;
tvbuff_t *next_tvb;
gint offset = 0;
guint len = 0;
guint is_tn3270 = 0;
guint is_tn5250 = 0;
int data_len;
gint iac_offset;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "TELNET");
col_set_str(pinfo->cinfo, COL_INFO, "Telnet Data ...");
is_tn3270 = find_tn3270_conversation(pinfo);
is_tn5250 = find_tn5250_conversation(pinfo);
ti = proto_tree_add_item(tree, proto_telnet, tvb, offset, -1, ENC_NA);
telnet_tree = proto_item_add_subtree(ti, ett_telnet);
/*
* Scan through the buffer looking for an IAC byte.
*/
while ((len = tvb_reported_length_remaining(tvb, offset)) > 0) {
iac_offset = find_unescaped_iac(tvb, offset, len);
if (iac_offset != -1) {
/*
* We found an IAC byte.
* If there's any data before it, add that data to the
* tree, a line at a time.
*/
data_len = iac_offset - offset;
if (data_len > 0) {
if (is_tn3270) {
next_tvb = tvb_new_subset_length(tvb, offset, data_len);
call_dissector(tn3270_handle, next_tvb, pinfo, telnet_tree);
} else if (is_tn5250) {
next_tvb = tvb_new_subset_length(tvb, offset, data_len);
call_dissector(tn5250_handle, next_tvb, pinfo, telnet_tree);
} else
telnet_add_text(telnet_tree, tvb, offset, data_len);
}
/*
* Now interpret the command.
*/
offset = telnet_command(pinfo, telnet_tree, tvb, iac_offset);
} else {
/* get more data if tn3270 */
if (is_tn3270 || is_tn5250) {
pinfo->desegment_offset = offset;
pinfo->desegment_len = DESEGMENT_ONE_MORE_SEGMENT;
return tvb_captured_length(tvb);
}
/*
* We found no IAC byte, so what remains in the buffer
* is the last of the data in the packet.
* Add it to the tree, a line at a time, and then quit.
*/
telnet_add_text(telnet_tree, tvb, offset, len);
break;
}
}
return tvb_captured_length(tvb);
}
void
proto_register_telnet(void)
{
static hf_register_info hf[] = {
{ &hf_telnet_cmd,
{ "Command", "telnet.cmd", FT_UINT8, BASE_DEC,
VALS(cmd_vals), 0, NULL, HFILL }
},
{ &hf_telnet_subcmd,
{ "Subcommand", "telnet.subcmd", FT_UINT8, BASE_DEC,
NULL, 0, NULL, HFILL }
},
{ &hf_telnet_auth_name,
{ "Name", "telnet.auth.name", FT_STRING, BASE_NONE,
NULL, 0, "Name of user being authenticated", HFILL }
},
{ &hf_telnet_auth_cmd,
{ "Auth Cmd", "telnet.auth.cmd", FT_UINT8, BASE_DEC,
VALS(auth_cmd_vals), 0, "Authentication Command", HFILL }
},
{ &hf_telnet_auth_type,
{ "Auth Type", "telnet.auth.type", FT_UINT8, BASE_DEC,
VALS(auth_type_vals), 0, "Authentication Type", HFILL }
},
{ &hf_telnet_auth_mod_cred_fwd,
{ "Cred Fwd", "telnet.auth.mod.cred_fwd", FT_BOOLEAN, 8,
TFS(&auth_mod_cred_fwd), 0x08, "Modifier: Whether client will forward creds or not", HFILL }
},
{ &hf_telnet_auth_mod_who,
{ "Who", "telnet.auth.mod.who", FT_BOOLEAN, 8,
TFS(&auth_mod_who), 0x01, "Modifier: Who to mask", HFILL }
},
{ &hf_telnet_auth_mod_how,
{ "How", "telnet.auth.mod.how", FT_BOOLEAN, 8,
TFS(&auth_mod_how), 0x02, "Modifier: How to mask", HFILL }
},
{ &hf_telnet_auth_mod_enc,
{ "Encrypt", "telnet.auth.mod.enc", FT_UINT8, BASE_DEC,
VALS(auth_mod_enc), 0x14, "Modifier: How to enable Encryption", HFILL }
},
{ &hf_telnet_auth_krb5_type,
{ "Command", "telnet.auth.krb5.cmd", FT_UINT8, BASE_DEC,
VALS(auth_krb5_types), 0, "Krb5 Authentication sub-command", HFILL }
},
{ &hf_telnet_string_subopt_value,
{ "Value", "telnet.string_subopt.value", FT_STRING, BASE_NONE,
NULL, 0, NULL, HFILL }
},
{ &hf_telnet_naws_subopt_width,
{ "Width", "telnet.naws_subopt.width", FT_UINT16, BASE_DEC,
NULL, 0, NULL, HFILL }
},
{ &hf_telnet_naws_subopt_height,
{ "Height", "telnet.naws_subopt.height", FT_UINT16, BASE_DEC,
NULL, 0, NULL, HFILL }
},
{ &hf_telnet_outmark_subopt_cmd,
{ "Command", "telnet.outmark_subopt.cmd", FT_CHAR, BASE_HEX,
VALS(telnet_outmark_subopt_cmd_vals), 0, NULL, HFILL }
},
{ &hf_telnet_outmark_subopt_banner,
{ "Banner", "telnet.outmark_subopt.banner", FT_STRING, BASE_NONE,
NULL, 0, NULL, HFILL }
},
{ &hf_telnet_comport_subopt_signature,
{ "Signature", "telnet.comport_subopt.signature", FT_STRING, BASE_NONE,
NULL, 0, NULL, HFILL }
},
{ &hf_telnet_comport_subopt_baud_rate,
{ "Baud Rate", "telnet.comport_subopt.baud_rate", FT_UINT32, BASE_DEC,
NULL, 0, NULL, HFILL }
},
{ &hf_telnet_comport_subopt_data_size,
{ "Data Size", "telnet.comport_subopt.data_size", FT_UINT8, BASE_DEC,
NULL, 0, NULL, HFILL }
},
{ &hf_telnet_comport_subopt_parity,
{ "Parity", "telnet.comport_subopt.parity", FT_UINT8, BASE_DEC,
NULL, 0, NULL, HFILL }
},
{ &hf_telnet_comport_subopt_stop,
{ "Stop Bits", "telnet.comport_subopt.stop", FT_UINT8, BASE_DEC,
NULL, 0, NULL, HFILL }
},
{ &hf_telnet_comport_subopt_control,
{ "Control", "telnet.comport_subopt.control", FT_UINT8, BASE_DEC,
NULL, 0, NULL, HFILL }
},
{ &hf_telnet_comport_linestate,
{ "Linestate", "telnet.comport_subopt.linestate", FT_STRING, BASE_NONE,
NULL, 0, NULL, HFILL }
},
{ &hf_telnet_comport_set_linestate_mask,
{ "Set Linestate Mask", "telnet.comport_subopt.set_linestate_mask", FT_STRING, BASE_NONE,
NULL, 0, NULL, HFILL }
},
{ &hf_telnet_comport_modemstate,
{ "Modemstate", "telnet.comport_subopt.modemstate", FT_STRING, BASE_NONE,
NULL, 0, NULL, HFILL }
},
{ &hf_telnet_comport_set_modemstate_mask,
{ "Set Modemstate Mask", "telnet.comport_subopt.set_modemstate_mask", FT_STRING, BASE_NONE,
NULL, 0, NULL, HFILL }
},
{ &hf_telnet_comport_subopt_flow_control_suspend,
{ "Flow Control Suspend", "telnet.comport_subopt.flow_control_suspend", FT_NONE, BASE_NONE,
NULL, 0, NULL, HFILL }
},
{ &hf_telnet_comport_subopt_flow_control_resume,
{ "Flow Control Resume", "telnet.comport_subopt.flow_control_resume", FT_NONE, BASE_NONE,
NULL, 0, NULL, HFILL }
},
{ &hf_telnet_comport_subopt_purge,
{ "Purge", "telnet.comport_subopt.purge", FT_UINT8, BASE_DEC,
NULL, 0, NULL, HFILL }
},
{ &hf_telnet_rfc_subopt_cmd,
{ "Command", "telnet.rfc_subopt.cmd", FT_UINT8, BASE_DEC,
VALS(rfc_opt_vals), 0, NULL, HFILL }
},
{ &hf_telnet_tabstop,
{ "Tabstop value", "telnet.tabstop", FT_UINT8, BASE_DEC,
NULL, 0, NULL, HFILL }
},
{ &hf_telnet_enc_cmd,
{ "Enc Cmd", "telnet.enc.cmd", FT_UINT8, BASE_DEC,
VALS(enc_cmd_vals), 0, "Encryption command", HFILL }
},
{ &hf_telnet_enc_type,
{ "Enc Type", "telnet.enc.type", FT_UINT8, BASE_DEC,
VALS(enc_type_vals), 0, "Encryption type", HFILL }
},
{ &hf_telnet_enc_type_data,
{ "Type-specific data", "telnet.enc.type_data", FT_BYTES, BASE_NONE,
NULL, 0, NULL, HFILL }
},
{ &hf_telnet_enc_key_id,
{ "Key ID", "telnet.enc.key_id", FT_BYTES, BASE_NONE,
NULL, 0, NULL, HFILL }
},
{ &hf_telnet_data,
{ "Data", "telnet.data", FT_STRING, BASE_NONE,
NULL, 0, NULL, HFILL }
},
{ &hf_telnet_option_data,
{ "Option data", "telnet.option_data", FT_BYTES, BASE_NONE,
NULL, 0, NULL, HFILL }
},
{ &hf_telnet_subcommand_data,
{ "Subcommand data", "telnet.subcommand_data", FT_BYTES, BASE_NONE,
NULL, 0, NULL, HFILL }
},
{ &hf_tn3270_subopt,
{ "Suboption", "telnet.tn3270.subopt", FT_UINT8, BASE_DEC,
VALS(tn3270_subopt_vals), 0, NULL, HFILL }
},
{ &hf_tn3270_connect,
{ "Connect", "telnet.tn3270.connect", FT_STRING, BASE_NONE,
NULL, 0, NULL, HFILL }
},
{ &hf_tn3270_is,
{ "Is", "telnet.tn3270.is", FT_STRING, BASE_NONE,
NULL, 0, NULL, HFILL }
},
{ &hf_tn3270_request_string,
{ "Request", "telnet.tn3270.request_string", FT_STRING, BASE_NONE,
NULL, 0, NULL, HFILL }
},
{ &hf_tn3270_reason,
{ "Reason", "telnet.tn3270.reason", FT_UINT8, BASE_DEC,
VALS(tn3270_reason_vals), 0, NULL, HFILL }
},
{ &hf_tn3270_request,
{ "Request", "telnet.tn3270.request", FT_UINT8, BASE_DEC,
VALS(tn3270_request_vals), 0, NULL, HFILL }
},
{ &hf_tn3270_regime_subopt_value,
{ "Value", "telnet.tn3270.regime_subopt.value", FT_STRING, BASE_NONE,
NULL, 0, NULL, HFILL }
},
{ &hf_tn3270_regime_cmd,
{ "Cmd", "telnet.regime_cmd", FT_UINT8, BASE_DEC,
NULL, 0, NULL, HFILL }
},
{ &hf_telnet_starttls,
{ "Follows", "telnet.starttls", FT_UINT8, BASE_DEC,
NULL, 0, NULL, HFILL }
},
};
static gint *ett[] = {
&ett_telnet,
&ett_telnet_cmd,
&ett_telnet_subopt,
&ett_status_subopt,
&ett_rcte_subopt,
&ett_olw_subopt,
&ett_ops_subopt,
&ett_crdisp_subopt,
&ett_htstops_subopt,
&ett_htdisp_subopt,
&ett_ffdisp_subopt,
&ett_vtstops_subopt,
&ett_vtdisp_subopt,
&ett_lfdisp_subopt,
&ett_extasc_subopt,
&ett_bytemacro_subopt,
&ett_det_subopt,
&ett_supdupout_subopt,
&ett_sendloc_subopt,
&ett_termtype_subopt,
&ett_tacacsui_subopt,
&ett_outmark_subopt,
&ett_tlocnum_subopt,
&ett_tn3270reg_subopt,
&ett_x3pad_subopt,
&ett_naws_subopt,
&ett_tspeed_subopt,
&ett_rfc_subopt,
&ett_linemode_subopt,
&ett_xdpyloc_subopt,
&ett_env_subopt,
&ett_auth_subopt,
&ett_enc_subopt,
&ett_newenv_subopt,
&ett_tn3270e_subopt,
&ett_xauth_subopt,
&ett_charset_subopt,
&ett_rsp_subopt,
&ett_comport_subopt,
&ett_starttls_subopt,
};
static ei_register_info ei[] = {
{ &ei_telnet_invalid_subcommand, { "telnet.invalid_subcommand", PI_PROTOCOL, PI_WARN, "Invalid subcommand", EXPFILL }},
{ &ei_telnet_invalid_baud_rate, { "telnet.invalid_baud_rate", PI_PROTOCOL, PI_WARN, "Invalid Baud Rate", EXPFILL }},
{ &ei_telnet_invalid_data_size, { "telnet.invalid_data_size", PI_PROTOCOL, PI_WARN, "Invalid Data Size", EXPFILL }},
{ &ei_telnet_invalid_parity, { "telnet.invalid_parity", PI_PROTOCOL, PI_WARN, "Invalid Parity Packet", EXPFILL }},
{ &ei_telnet_invalid_stop, { "telnet.invalid_stop", PI_PROTOCOL, PI_WARN, "Invalid Stop Packet", EXPFILL }},
{ &ei_telnet_invalid_control, { "telnet.invalid_control", PI_PROTOCOL, PI_WARN, "Invalid Control Packet", EXPFILL }},
{ &ei_telnet_invalid_linestate, { "telnet.invalid_linestate", PI_PROTOCOL, PI_WARN, "Invalid linestate", EXPFILL }},
{ &ei_telnet_invalid_modemstate, { "telnet.invalid_modemstate", PI_PROTOCOL, PI_WARN, "Invalid Modemstate", EXPFILL }},
{ &ei_telnet_invalid_purge, { "telnet.invalid_purge", PI_PROTOCOL, PI_WARN, "Invalid Purge Packet", EXPFILL }},
{ &ei_telnet_kerberos_blob_too_long, { "telnet.kerberos_blob_too_long", PI_PROTOCOL, PI_NOTE, "Kerberos blob too long to dissect", EXPFILL }},
{ &ei_telnet_enc_cmd_unknown, { "telnet.enc.cmd.unknown", PI_PROTOCOL, PI_WARN, "Unknown encryption command", EXPFILL }},
{ &ei_telnet_suboption_length, { "telnet.suboption_length.invalid", PI_PROTOCOL, PI_WARN, "Bogus suboption data", EXPFILL }},
};
expert_module_t* expert_telnet;
proto_telnet = proto_register_protocol("Telnet", "TELNET", "telnet");
proto_register_field_array(proto_telnet, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
expert_telnet = expert_register_protocol(proto_telnet);
expert_register_field_array(expert_telnet, ei, array_length(ei));
telnet_handle = register_dissector("telnet", dissect_telnet, proto_telnet);
}
void
proto_reg_handoff_telnet(void)
{
dissector_add_uint_with_preference("tcp.port", TCP_PORT_TELNET, telnet_handle);
tn3270_handle = find_dissector_add_dependency("tn3270", proto_telnet);
tn5250_handle = find_dissector_add_dependency("tn5250", proto_telnet);
ssl_handle = find_dissector("ssl");
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local Variables:
* c-basic-offset: 2
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=2 tabstop=8 expandtab:
* :indentSize=2:tabSize=8:noTabs=true:
*/
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