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wireshark/epan/dissectors/packet-kdp.c

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/* packet-kdp.c
* Routines for KDP (Kontiki Delivery Protocol) packet disassembly
*
* Copyright (c) 2008 by Kontiki Inc.
* Wade Hennessey <wade@kontiki.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1999 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.
*/
#include "config.h"
#include <epan/packet.h>
void proto_register_kdp(void);
void proto_reg_handoff_kdp(void);
#define KDP_PORT 19948 /* Not IANA registered */
#define BUFFER_SIZE 80
static int proto_kdp = -1;
static gint ett_kdp = -1;
static gint ett_kdp_flags = -1;
static int hf_kdp_version = -1;
static int hf_kdp_headerlen = -1;
static int hf_kdp_flags = -1;
static int hf_kdp_errors = -1;
static int hf_kdp_destflowid = -1;
static int hf_kdp_srcflowid = -1;
static int hf_kdp_sequence = -1;
static int hf_kdp_ack = -1;
static int hf_kdp_maxsegmentsize = -1;
static int hf_kdp_optionnumber = -1;
static int hf_kdp_optionlen = -1;
static int hf_kdp_option1 = -1;
static int hf_kdp_option2 = -1;
static int hf_kdp_option3 = -1;
static int hf_kdp_option4 = -1;
static int hf_kdp_option5 = -1;
static int hf_kdp_option6 = -1;
static int hf_kdp_option7 = -1;
static int hf_kdp_option8 = -1;
static int hf_kdp_option9 = -1;
static int hf_kdp_option_unknown = -1;
static int hf_kdp_fragment = -1;
static int hf_kdp_fragtotal = -1;
static int hf_kdp_body = -1;
static int hf_kdp_xml_body = -1;
#define KDP_DROP_FLAG (1 << 0)
#define KDP_SYN_FLAG (1 << 1)
#define KDP_ACK_FLAG (1 << 2)
#define KDP_RST_FLAG (1 << 3)
#define KDP_BCST_FLAG (1 << 4)
#define KDP_DUP_FLAG (1 << 5)
static int hf_kdp_drop_flag = -1;
static int hf_kdp_syn_flag = -1;
static int hf_kdp_ack_flag = -1;
static int hf_kdp_rst_flag = -1;
static int hf_kdp_bcst_flag = -1;
static int hf_kdp_dup_flag = -1;
static int dissect_kdp(tvbuff_t *tvb,
packet_info *pinfo,
proto_tree *tree, void* data _U_) {
proto_item *ti;
proto_tree *kdp_tree;
guint body_len;
guint8 version;
guint8 header_len = 0;
guint8 packet_flags = 0;
guint8 packet_errors = 0;
guint32 sequence_number = G_MAXUINT32;
guint32 ack_number = G_MAXUINT32;
guint32 src_flowid = G_MAXUINT32;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "KDP");
col_clear(pinfo->cinfo, COL_INFO);
ti = proto_tree_add_item(tree, proto_kdp, tvb, 0, -1, ENC_NA);
kdp_tree = proto_item_add_subtree(ti, ett_kdp);
version = tvb_get_guint8(tvb, 0);
if (version != 2) {
/* Version other than 2 is really SDDP in UDP */
proto_tree_add_item(kdp_tree, hf_kdp_version, tvb, 0, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(kdp_tree, hf_kdp_xml_body, tvb, 0, -1, ENC_ASCII|ENC_NA);
} else {
proto_tree *flags_tree;
header_len = tvb_get_guint8(tvb, 1) * 4;
body_len = tvb_reported_length(tvb);
if (header_len > body_len) {
body_len = 0; /* malformed packet */
} else {
body_len = body_len - header_len;
}
packet_flags = tvb_get_guint8(tvb, 2);
packet_errors = tvb_get_guint8(tvb, 3);
proto_tree_add_item(kdp_tree, hf_kdp_version, tvb, 0, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(kdp_tree, hf_kdp_headerlen, tvb, 1, 1, ENC_BIG_ENDIAN);
ti = proto_tree_add_item(kdp_tree, hf_kdp_flags, tvb, 2, 1, ENC_BIG_ENDIAN);
flags_tree = proto_item_add_subtree(ti, ett_kdp_flags);
proto_tree_add_item(flags_tree, hf_kdp_drop_flag, tvb, 2, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(flags_tree, hf_kdp_syn_flag, tvb, 2, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(flags_tree, hf_kdp_ack_flag, tvb, 2, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(flags_tree, hf_kdp_rst_flag, tvb, 2, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(flags_tree, hf_kdp_bcst_flag, tvb, 2, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(flags_tree, hf_kdp_dup_flag, tvb, 2, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(kdp_tree, hf_kdp_errors, tvb, 3, 1, ENC_BIG_ENDIAN);
if (header_len > 4) {
int offset;
offset = 4;
if (packet_flags & KDP_ACK_FLAG) {
proto_tree_add_item(kdp_tree, hf_kdp_destflowid, tvb, offset, 4, ENC_BIG_ENDIAN);
offset = offset + 4;
}
if (packet_flags & (KDP_SYN_FLAG | KDP_BCST_FLAG)) {
proto_tree_add_item(kdp_tree, hf_kdp_srcflowid, tvb, offset, 4, ENC_BIG_ENDIAN);
src_flowid = tvb_get_ntohl(tvb, offset);
offset = offset + 4;
}
proto_tree_add_item(kdp_tree, hf_kdp_sequence, tvb, offset, 4, ENC_BIG_ENDIAN);
sequence_number = tvb_get_ntohl(tvb, offset);
offset = offset + 4;
if (packet_flags & KDP_ACK_FLAG) {
proto_tree_add_item(kdp_tree, hf_kdp_ack, tvb, offset, 4, ENC_BIG_ENDIAN);
ack_number = tvb_get_ntohl(tvb, offset);
offset = offset + 4;
}
if (packet_flags & KDP_SYN_FLAG) {
proto_tree_add_item(kdp_tree, hf_kdp_maxsegmentsize, tvb, offset, 4, ENC_BIG_ENDIAN);
offset = offset + 4;
}
while (offset < ((body_len > 0) ? header_len - 4 : header_len)) {
guint8 option_number;
guint8 option_len = 0;
option_number = tvb_get_guint8(tvb, offset);
proto_tree_add_item(kdp_tree, hf_kdp_optionnumber, tvb, offset, 1, ENC_BIG_ENDIAN);
offset = offset + 1;
if (option_number > 0) {
option_len = tvb_get_guint8(tvb, offset);
proto_tree_add_item(kdp_tree, hf_kdp_optionlen, tvb, offset, 1, ENC_BIG_ENDIAN);
offset = offset + 1;
}
switch (option_number) {
case 0:
break;
case 1:
proto_tree_add_item(kdp_tree, hf_kdp_option1, tvb, offset, 2, ENC_BIG_ENDIAN);
offset = offset + 2;
break;
case 2:
proto_tree_add_item(kdp_tree, hf_kdp_option2, tvb, offset, 2, ENC_BIG_ENDIAN);
offset = offset + 2;
break;
case 3:
proto_tree_add_item(kdp_tree, hf_kdp_option3, tvb, offset, 2, ENC_BIG_ENDIAN);
offset = offset + 2;
break;
case 4:
proto_tree_add_item(kdp_tree, hf_kdp_option4, tvb, offset, 0, ENC_NA);
break;
case 5:
proto_tree_add_item(kdp_tree, hf_kdp_option5, tvb, offset, 0, ENC_NA);
break;
case 6:
proto_tree_add_item(kdp_tree, hf_kdp_option6, tvb, offset, option_len - 2, ENC_NA);
offset = offset + option_len - 2;
break;
case 7:
proto_tree_add_item(kdp_tree, hf_kdp_option7, tvb, offset, 2, ENC_BIG_ENDIAN);
offset = offset + 2;
break;
case 8:
proto_tree_add_item(kdp_tree, hf_kdp_option8, tvb, offset, 2, ENC_BIG_ENDIAN);
offset = offset + 2;
break;
case 9:
proto_tree_add_item(kdp_tree, hf_kdp_option9, tvb, offset, 2, ENC_BIG_ENDIAN);
offset = offset + 2;
break;
default:
proto_tree_add_item(kdp_tree, hf_kdp_option_unknown, tvb, offset, option_len - 2, ENC_NA);
offset = offset + option_len - 2;
break;
}
}
if (body_len > 0) {
proto_tree_add_item(kdp_tree, hf_kdp_fragment, tvb, offset, 2, ENC_BIG_ENDIAN);
offset = offset + 2;
proto_tree_add_item(kdp_tree, hf_kdp_fragtotal, tvb, offset, 2, ENC_BIG_ENDIAN);
offset = offset + 2;
proto_tree_add_item(kdp_tree, hf_kdp_body, tvb, offset, -1, ENC_NA);
}
}
}
/* Now that we know sequence number and optional ack number, we can
print more detailed summary info */
if (version != 2) {
col_set_str(pinfo->cinfo, COL_INFO, "SDDP message");
} else {
char ack_string[BUFFER_SIZE];
char seq_num_string[BUFFER_SIZE];
char src_flowid_string[BUFFER_SIZE];
if (packet_flags & KDP_ACK_FLAG) {
g_snprintf(ack_string, sizeof(ack_string), "ACK=%x ", ack_number);
} else {
ack_string[0] = '\0';
}
if (header_len > 4) {
g_snprintf(seq_num_string, sizeof(seq_num_string), "SEQ=%x ", sequence_number);
} else {
seq_num_string[0] = '\0';
}
if (packet_flags & (KDP_SYN_FLAG | KDP_BCST_FLAG)) {
g_snprintf(src_flowid_string, sizeof(src_flowid_string), "SRC_FLOWID=%x ", src_flowid);
} else {
src_flowid_string[0] = '\0';
}
col_add_fstr(pinfo->cinfo, COL_INFO, "%s%s%s%s%s%s%s%serrors=%d",
((packet_flags & KDP_DROP_FLAG) ? "DROP " : ""),
((packet_flags & KDP_SYN_FLAG) ? "SYN " : ""),
((packet_flags & KDP_RST_FLAG) ? "RST " : ""),
((packet_flags & KDP_BCST_FLAG) ? "BCST " : ""),
((packet_flags & KDP_DUP_FLAG) ? "DUP " : ""),
ack_string,
seq_num_string,
src_flowid_string,
packet_errors);
}
return tvb_captured_length(tvb);
}
void proto_register_kdp(void) {
static hf_register_info hf[] = {
{ &hf_kdp_version,
{"KDP version", "kdp.version",
FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_headerlen,
{"KDP header len", "kdp.headerlen",
FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_flags,
{"KDP flags", "kdp.flags",
FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_drop_flag,
{"KDP DROP Flag", "kdp.flags.drop",
FT_BOOLEAN, 8, NULL, KDP_DROP_FLAG, NULL, HFILL}
},
{ &hf_kdp_syn_flag,
{"KDP SYN Flag", "kdp.flags.syn",
FT_BOOLEAN, 8, NULL, KDP_SYN_FLAG, NULL, HFILL}
},
{ &hf_kdp_ack_flag,
{"KDP ACK Flag", "kdp.flags.ack",
FT_BOOLEAN, 8, NULL, KDP_ACK_FLAG, NULL, HFILL}
},
{ &hf_kdp_rst_flag,
{"KDP RST Flag", "kdp.flags.rst",
FT_BOOLEAN, 8, NULL, KDP_RST_FLAG, NULL, HFILL}
},
{ &hf_kdp_bcst_flag,
{"KDP BCST Flag", "kdp.flags.bcst",
FT_BOOLEAN, 8, NULL, KDP_BCST_FLAG, NULL, HFILL}
},
{ &hf_kdp_dup_flag,
{"KDP DUP Flag", "kdp.flags.dup",
FT_BOOLEAN, 8, NULL, KDP_DUP_FLAG, NULL, HFILL}
},
{ &hf_kdp_errors,
{"KDP errors", "kdp.errors",
FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_destflowid,
{ "DestFlowID", "kdp.destflowid",
FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_srcflowid,
{ "SrcFlowID", "kdp.srcflowid",
FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_sequence,
{ "Sequence", "kdp.sequence",
FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_ack,
{ "Ack", "kdp.ack",
FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_maxsegmentsize,
{ "MaxSegmentSize", "kdp.maxsegmentsize",
FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_optionnumber,
{ "Option Number", "kdp.optionnumber",
FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_optionlen,
{ "Option Len", "kdp.option",
FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_option1,
{ "Option1 - Max Window", "kdp.option1",
FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_option2,
{ "Option2 - TCP Fraction", "kdp.option2",
FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_option3,
{ "Option3 - KDP Version", "kdp.option3",
FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_option4,
{ "Option4 - Enable Reliable", "kdp.option4",
FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_option5,
{ "Option5 - Disable Reliable", "kdp.option5",
FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_option6,
{ "Option6 - SACK", "kdp.option6",
FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_option7,
{ "Option7 - COS", "kdp.option7",
FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_option8,
{ "Option8 - BWMIN", "kdp.option8",
FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_option9,
{ "Option9 - INT", "kdp.option9",
FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_option_unknown,
{ "Unknown option", "kdp.option_unknown",
FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_fragment,
{ "Fragment", "kdp.fragment",
FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_fragtotal,
{ "FragTotal", "kdp.fragtotal",
FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_body,
{ "Encrypted Body", "kdp.body",
FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_xml_body,
{ "XML Body", "kdp.xml_body",
FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL}
}
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_kdp, &ett_kdp_flags
};
proto_kdp = proto_register_protocol("Kontiki Delivery Protocol", /* name */
"KDP", /* short name */
"kdp"); /* abbrev */
proto_register_field_array(proto_kdp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_kdp(void) {
dissector_handle_t kdp_handle;
kdp_handle = create_dissector_handle(dissect_kdp, proto_kdp);
dissector_add_uint_with_preference("udp.port", KDP_PORT, kdp_handle);
}
/*
* 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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