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wireshark/epan/dissectors/packet-roofnet.c

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/* packet-roofnet.c
* Routines for roofnet dissection
* Copyright 2006, Sebastien Tandel (sebastien@tandel.be)
*
* 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.
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/addr_resolv.h>
#include <epan/expert.h>
#include <epan/ptvcursor.h>
/* roofnet packet type constants */
#define ROOFNET_PT_QUERY 0x01
#define ROOFNET_PT_REPLY 0x02
#define ROOFNET_PT_DATA 0x04
#define ROOFNET_PT_GATEWAY 0x08
static const value_string roofnet_pt_vals[] = {
{ ROOFNET_PT_QUERY, "Query" },
{ ROOFNET_PT_REPLY, "Reply" },
{ ROOFNET_PT_DATA, "Data" },
{ ROOFNET_PT_GATEWAY, "Gateway" },
{ 0, NULL }
};
/* roofnet flag bit masks */
#define ROOFNET_FLAG_ERROR (1<<0)
#define ROOFNET_FLAG_UPDATE (1<<1)
#define ROOFNET_FLAG_LAYER2 (1<<9)
#define ROOFNET_FLAG_RESERVED 0xFDFC
#define ROOFNET_FLAG_MASK (ROOFNET_FLAG_ERROR | ROOFNET_FLAG_UPDATE | ROOFNET_FLAG_LAYER2)
/* header length */
#define ROOFNET_HEADER_LENGTH 160
/* roofnet max length */
/* may change with time */
#define ROOFNET_MAX_LENGTH 400
/* Roofnet Link Description Length
* which is 6 fields of 4 bytes */
#define ROOFNET_LINK_DESCRIPTION_LENGTH 6*4
/* offset constants */
#define ROOFNET_OFFSET_TYPE 1
#define ROOFNET_OFFSET_NLINKS 2
#define ROOFNET_OFFSET_DATA_LENGTH 10
/* offset relative to a link section of roofnet */
#define ROOFNET_LINK_OFFSET_SRC 0
#define ROOFNET_LINK_OFFSET_DST 20
/* roofnet link fields length */
#define ROOFNET_LINK_LEN 24
/* forward reference */
void proto_register_roofnet(void);
void proto_reg_handoff_roofnet(void);
static dissector_handle_t ip_handle;
static dissector_handle_t eth_withoutfcs_handle;
static int proto_roofnet = -1;
/* hf fields for the header of roofnet */
static int hf_roofnet_version = -1;
static int hf_roofnet_type = -1;
static int hf_roofnet_nlinks = -1;
static int hf_roofnet_next = -1;
static int hf_roofnet_ttl = -1;
static int hf_roofnet_cksum = -1;
static int hf_roofnet_flags = -1;
static int hf_roofnet_flags_error = -1;
static int hf_roofnet_flags_update = -1;
static int hf_roofnet_flags_layer2 = -1;
static int hf_roofnet_flags_reserved = -1;
static int hf_roofnet_data_length = -1;
static int hf_roofnet_query_dst = -1;
static int hf_roofnet_seq = -1;
/* static int hf_roofnet_links = -1; */
static int hf_roofnet_link_src = -1;
static int hf_roofnet_link_forward = -1;
static int hf_roofnet_link_rev = -1;
static int hf_roofnet_link_seq = -1;
static int hf_roofnet_link_age = -1;
static int hf_roofnet_link_dst = -1;
static const int *flag_list[] = {
&hf_roofnet_flags_error,
&hf_roofnet_flags_update,
&hf_roofnet_flags_layer2,
&hf_roofnet_flags_reserved,
NULL
};
static gint ett_roofnet = -1;
static gint ett_roofnet_flags = -1;
static gint ett_roofnet_link = -1;
static expert_field ei_roofnet_too_many_links = EI_INIT;
static expert_field ei_roofnet_too_much_data = EI_INIT;
/*
* dissect the header of roofnet
*/
static guint16 dissect_roofnet_header(proto_tree *tree, tvbuff_t *tvb, guint *offset)
{
guint16 flags;
ptvcursor_t *cursor = ptvcursor_new(tree, tvb, *offset);
ptvcursor_add(cursor, hf_roofnet_version, 1, ENC_BIG_ENDIAN);
ptvcursor_add(cursor, hf_roofnet_type, 1, ENC_BIG_ENDIAN);
ptvcursor_add(cursor, hf_roofnet_nlinks, 1, ENC_BIG_ENDIAN);
ptvcursor_add(cursor, hf_roofnet_next, 1, ENC_BIG_ENDIAN);
ptvcursor_add(cursor, hf_roofnet_ttl, 2, ENC_BIG_ENDIAN);
proto_tree_add_checksum(ptvcursor_tree(cursor), ptvcursor_tvbuff(cursor), ptvcursor_current_offset(cursor),
hf_roofnet_cksum, -1, NULL, NULL, 0, ENC_BIG_ENDIAN, PROTO_CHECKSUM_NO_FLAGS);
ptvcursor_advance(cursor, 2);
flags = tvb_get_ntohs(ptvcursor_tvbuff(cursor), ptvcursor_current_offset(cursor));
proto_tree_add_bitmask(ptvcursor_tree(cursor), ptvcursor_tvbuff(cursor), ptvcursor_current_offset(cursor),
hf_roofnet_flags, ett_roofnet_flags, flag_list, ENC_BIG_ENDIAN);
ptvcursor_advance(cursor, 2);
ptvcursor_add(cursor, hf_roofnet_data_length, 2, ENC_BIG_ENDIAN);
ptvcursor_add(cursor, hf_roofnet_query_dst, 4, ENC_BIG_ENDIAN);
ptvcursor_add(cursor, hf_roofnet_seq, 4, ENC_BIG_ENDIAN);
*offset = ptvcursor_current_offset(cursor);
ptvcursor_free(cursor);
return flags;
}
/*
* dissect the description of link in roofnet
*/
static void dissect_roofnet_link(proto_tree *tree, tvbuff_t *tvb, guint *offset, guint link)
{
proto_tree *subtree = NULL;
ptvcursor_t *cursor = NULL;
guint32 addr_src = 0;
guint32 addr_dst = 0;
addr_src = tvb_get_ipv4(tvb, *offset + ROOFNET_LINK_OFFSET_SRC);
addr_dst = tvb_get_ipv4(tvb, *offset + ROOFNET_LINK_OFFSET_DST);
subtree = proto_tree_add_subtree_format(tree, tvb, *offset, ROOFNET_LINK_LEN,
ett_roofnet_link, NULL, "link: %u, src: %s, dst: %s",
link,
get_hostname(addr_src),
get_hostname(addr_dst));
proto_tree_add_ipv4(subtree, hf_roofnet_link_src, tvb, *offset, 4, addr_src);
*offset += 4;
cursor = ptvcursor_new(subtree, tvb, *offset);
ptvcursor_add(cursor, hf_roofnet_link_forward, 4, ENC_BIG_ENDIAN);
ptvcursor_add(cursor, hf_roofnet_link_rev, 4, ENC_BIG_ENDIAN);
ptvcursor_add(cursor, hf_roofnet_link_seq, 4, ENC_BIG_ENDIAN);
ptvcursor_add(cursor, hf_roofnet_link_age, 4, ENC_BIG_ENDIAN);
*offset = ptvcursor_current_offset(cursor);
ptvcursor_free(cursor);
proto_tree_add_ipv4(subtree, hf_roofnet_link_dst, tvb, *offset, 4, addr_dst);
/* don't increment offset here because the dst of this link is the src of the next one */
}
/*
* dissect the data in roofnet
*/
static void dissect_roofnet_data(proto_tree *tree, tvbuff_t *tvb, packet_info * pinfo, gint offset, guint16 flags)
{
guint16 roofnet_datalen = 0;
guint16 remaining_datalen = 0;
roofnet_datalen = tvb_get_ntohs(tvb, ROOFNET_OFFSET_DATA_LENGTH);
remaining_datalen = tvb_reported_length_remaining(tvb, offset);
/* dissect on remaining_datalen */
if (roofnet_datalen < remaining_datalen)
proto_tree_add_expert_format(tree, pinfo, &ei_roofnet_too_much_data, tvb, offset, roofnet_datalen,
"[More payload data (%u) than told by Roofnet (%u)]",
remaining_datalen, roofnet_datalen);
if (roofnet_datalen == 0)
return;
/* dissect payload */
if (flags & ROOFNET_FLAG_LAYER2) {
/* ethernet frame is padded with 2 bytes at the start */
call_dissector(eth_withoutfcs_handle, tvb_new_subset_remaining(tvb, offset+2), pinfo, tree);
} else {
call_dissector(ip_handle, tvb_new_subset_remaining(tvb, offset), pinfo, tree);
}
}
/*
* entry point of the roofnet dissector
*/
static int dissect_roofnet(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_item * it;
proto_tree * roofnet_tree;
guint offset = 0;
guint8 roofnet_msg_type = 0;
guint8 roofnet_nlinks = 0;
guint8 nlink = 1;
guint16 flags;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "Roofnet");
roofnet_msg_type = tvb_get_guint8(tvb, ROOFNET_OFFSET_TYPE);
/* Clear out stuff in the info column */
col_add_fstr(pinfo->cinfo, COL_INFO, "Message Type: %s",
val_to_str(roofnet_msg_type, roofnet_pt_vals, "Unknown (%d)"));
it = proto_tree_add_item(tree, proto_roofnet, tvb, offset, -1, ENC_NA);
roofnet_tree = proto_item_add_subtree(it, ett_roofnet);
flags = dissect_roofnet_header(roofnet_tree, tvb, &offset);
roofnet_nlinks = tvb_get_guint8(tvb, ROOFNET_OFFSET_NLINKS);
/* Check that we do not have a malformed roofnet packet */
if ((roofnet_nlinks*6*4)+ROOFNET_HEADER_LENGTH > ROOFNET_MAX_LENGTH) {
expert_add_info_format(pinfo, it, &ei_roofnet_too_many_links, "Too many links (%u)", roofnet_nlinks);
return tvb_captured_length(tvb);
}
for (; roofnet_nlinks > 0; roofnet_nlinks--) {
/* Do we have enough buffer to decode the next link ? */
if (tvb_reported_length_remaining(tvb, offset) < ROOFNET_LINK_DESCRIPTION_LENGTH)
return offset;
dissect_roofnet_link(roofnet_tree, tvb, &offset, nlink++);
}
dissect_roofnet_data(tree, tvb, pinfo, offset+4, flags);
return tvb_captured_length(tvb);
}
void proto_register_roofnet(void)
{
static hf_register_info hf[] = {
/* Roofnet Header */
{ &hf_roofnet_version,
{ "Version", "roofnet.version",
FT_UINT8, BASE_DEC, NULL, 0x0, "Roofnet Version", HFILL }
},
{ &hf_roofnet_type,
{ "Type", "roofnet.type",
FT_UINT8, BASE_DEC, VALS(roofnet_pt_vals), 0x0, "Roofnet Message Type", HFILL }
},
{ &hf_roofnet_nlinks,
{ "Number of Links", "roofnet.nlinks",
FT_UINT8, BASE_DEC, NULL, 0x0, "Roofnet Number of Links", HFILL }
},
{ &hf_roofnet_next,
{ "Next Link", "roofnet.next",
FT_UINT8, BASE_DEC, NULL, 0x0, "Roofnet Next Link to Use", HFILL }
},
{ &hf_roofnet_ttl,
{ "Time To Live", "roofnet.ttl",
FT_UINT16, BASE_DEC, NULL, 0x0, "Roofnet Time to Live", HFILL }
},
{ &hf_roofnet_cksum,
{ "Checksum", "roofnet.cksum",
FT_UINT16, BASE_DEC, NULL, 0x0, "Roofnet Header Checksum", HFILL }
},
{ &hf_roofnet_flags,
{ "Flags", "roofnet.flags",
FT_UINT16, BASE_HEX, NULL, 0x0, "Roofnet flags", HFILL }
},
{ &hf_roofnet_flags_error,
{ "Roofnet Error", "roofnet.flags.error",
FT_BOOLEAN, 16, NULL, ROOFNET_FLAG_ERROR, NULL, HFILL }
},
{ &hf_roofnet_flags_update,
{ "Roofnet Update", "roofnet.flags.update",
FT_BOOLEAN, 16, NULL, ROOFNET_FLAG_UPDATE, NULL, HFILL }
},
{ &hf_roofnet_flags_layer2,
{ "Roofnet Layer 2", "roofnet.flags.layer2",
FT_BOOLEAN, 16, NULL, ROOFNET_FLAG_LAYER2, NULL, HFILL }
},
{ &hf_roofnet_flags_reserved,
{ "Roofnet Reserved", "roofnet.flags.reserved",
FT_BOOLEAN, 16, NULL, ROOFNET_FLAG_RESERVED, NULL, HFILL }
},
{ &hf_roofnet_data_length,
{ "Data Length", "roofnet.datalength",
FT_UINT16, BASE_DEC, NULL, 0x0, "Data Payload Length", HFILL }
},
{ &hf_roofnet_query_dst,
{ "Query Dst", "roofnet.querydst",
FT_IPv4, BASE_NONE, NULL, 0x0, "Roofnet Query Destination", HFILL }
},
{ &hf_roofnet_seq,
{ "Seq", "roofnet.seq",
FT_UINT32, BASE_DEC, NULL, 0x0, "Roofnet Sequential Number", HFILL }
},
#if 0
{ &hf_roofnet_links,
{ "Links", "roofnet.links",
FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL }
},
#endif
{ &hf_roofnet_link_src,
{ "Source IP", "roofnet.link.src",
FT_IPv4, BASE_NONE, NULL, 0x0, "Roofnet Message Source", HFILL }
},
{ &hf_roofnet_link_forward,
{ "Forward", "roofnet.link.forward",
FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
},
{ &hf_roofnet_link_rev,
{ "Rev", "roofnet.link.rev",
FT_UINT32, BASE_DEC, NULL, 0x0, "Revision Number", HFILL }
},
{ &hf_roofnet_link_seq,
{ "Seq", "roofnet.link.seq",
FT_UINT32, BASE_DEC, NULL, 0x0, "Link Sequential Number", HFILL }
},
{ &hf_roofnet_link_age,
{ "Age", "roofnet.link.age",
FT_UINT32, BASE_DEC, NULL, 0x0, "Information Age", HFILL }
},
{ &hf_roofnet_link_dst,
{ "Dst IP", "roofnet.link.dst",
FT_IPv4, BASE_NONE, NULL, 0x0, "Roofnet Message Destination", HFILL }
}
};
/* setup protocol subtree array */
static gint *ett[] = {
&ett_roofnet,
&ett_roofnet_flags,
&ett_roofnet_link
};
static ei_register_info ei[] = {
{ &ei_roofnet_too_many_links, { "roofnet.too_many_links", PI_MALFORMED, PI_ERROR, "Too many links", EXPFILL }},
{ &ei_roofnet_too_much_data, { "roofnet.too_much_data", PI_MALFORMED, PI_ERROR, "More payload data than told by Roofnet", EXPFILL }},
};
expert_module_t* expert_roofnet;
proto_roofnet = proto_register_protocol("Roofnet Protocol", "Roofnet", "roofnet");
proto_register_field_array(proto_roofnet, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
expert_roofnet = expert_register_protocol(proto_roofnet);
expert_register_field_array(expert_roofnet, ei, array_length(ei));
}
void proto_reg_handoff_roofnet(void)
{
dissector_handle_t roofnet_handle;
/* Until now there is no other option than having an IPv4 payload (maybe
* extended one day to IPv6 or other?) */
ip_handle = find_dissector_add_dependency("ip", proto_roofnet);
eth_withoutfcs_handle = find_dissector_add_dependency("eth_withoutfcs", proto_roofnet);
roofnet_handle = create_dissector_handle(dissect_roofnet, proto_roofnet);
/* I did not put the type numbers in the ethertypes.h as they only are
* experimental and not official */
dissector_add_uint("ethertype", 0x0641, roofnet_handle);
dissector_add_uint("ethertype", 0x0643, roofnet_handle);
dissector_add_uint("ethertype", 0x0644, roofnet_handle);
dissector_add_uint("ethertype", 0x0645, roofnet_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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