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packet-atalk.c
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/* packet-ddp.c
* Routines for DDP packet disassembly.
*
* $Id: packet-atalk.c,v 1.15 1999/10/12 06:20:02 gram Exp $
*
* Simon Wilkinson <sxw@dcs.ed.ac.uk>
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#include <glib.h>
#include "globals.h"
#include "packet.h"
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
static int proto_ddp = -1;
static int hf_ddp_hopcount = -1;
static int hf_ddp_len = -1;
static int hf_ddp_checksum = -1;
static int hf_ddp_dst_net = -1;
static int hf_ddp_src_net = -1;
static int hf_ddp_dst_node = -1;
static int hf_ddp_src_node = -1;
static int hf_ddp_dst_socket = -1;
static int hf_ddp_src_socket = -1;
static int hf_ddp_type = -1;
/* P = Padding, H = Hops, L = Len */
#if BYTE_ORDER == BIG_ENDIAN
/* PPHHHHLL LLLLLLLL */
# define ddp_hops(x) ( ( x >> 10) & 0x3C )
# define ddp_len(x) ( x & 0x03ff )
#else
/* LLLLLLLL PPHHHHLL*/
# define ddp_hops(x) ( x & 0x3C )
# define ddp_len(x) ( ntohs(x) & 0x03ff )
#endif
typedef struct _e_ddp {
guint16 hops_len; /* combines pad, hops, and len */
guint16 sum,dnet,snet;
guint8 dnode,snode;
guint8 dport,sport;
guint8 type;
} e_ddp;
#define DDP_RTMPDATA 0x01
#define DDP_NBP 0x02
#define DDP_ATP 0x03
#define DDP_AEP 0x04
#define DDP_RTMPREQ 0x05
#define DDP_ZIP 0x06
#define DDP_ADSP 0x07
#define DDP_HEADER_SIZE 13
void
dissect_ddp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
e_ddp ddp;
proto_tree *ddp_tree;
proto_item *ti;
value_string op_vals[] = { {DDP_RTMPDATA, "AppleTalk Routing Table response or data" },
{DDP_NBP, "AppleTalk Name Binding Protocol packet"},
{DDP_ATP, "AppleTalk Transaction Protocol packet"},
{DDP_AEP, "AppleTalk Echo Protocol packet"},
{DDP_RTMPREQ, "AppleTalk Routing Table request"},
{DDP_ZIP, "AppleTalk Zone Information Protocol packet"},
{DDP_ADSP, "AppleTalk Data Stream Protocol"},
{0, NULL} };
if (!BYTES_ARE_IN_FRAME(offset, DDP_HEADER_SIZE)) {
dissect_data(pd, offset, fd, tree);
return;
}
memcpy(&ddp, &pd[offset], sizeof(e_ddp));
ddp.dnet=ntohs(ddp.dnet);
ddp.snet=ntohs(ddp.snet);
ddp.sum=ntohs(ddp.sum);
if (check_col(fd, COL_RES_NET_SRC))
col_add_fstr(fd, COL_RES_NET_SRC, "%d.%d:%d", ddp.snet, ddp.snode, ddp.sport);
if (check_col(fd, COL_RES_NET_DST))
col_add_fstr(fd, COL_RES_NET_DST, "%d.%d:%d", ddp.dnet, ddp.dnode, ddp.dport);
if (check_col(fd, COL_PROTOCOL))
col_add_str(fd, COL_PROTOCOL, "DDP");
if (check_col(fd, COL_INFO))
col_add_str(fd, COL_INFO,
val_to_str(ddp.type, op_vals, "Unknown DDP protocol (%02x)"));
if (tree) {
ti = proto_tree_add_item(tree, proto_ddp, offset, DDP_HEADER_SIZE, NULL);
ddp_tree = proto_item_add_subtree(ti, ETT_IP);
proto_tree_add_item(ddp_tree, hf_ddp_hopcount, offset, 1,
ddp_hops(ddp.hops_len));
proto_tree_add_item(ddp_tree, hf_ddp_len, offset, 2,
ddp_len(ddp.hops_len));
proto_tree_add_item(ddp_tree, hf_ddp_checksum, offset + 2, 2, ddp.sum);
proto_tree_add_item(ddp_tree, hf_ddp_dst_net, offset + 4, 2, ddp.dnet);
proto_tree_add_item(ddp_tree, hf_ddp_src_net, offset + 6, 2, ddp.snet);
proto_tree_add_item(ddp_tree, hf_ddp_dst_node, offset + 8, 1, ddp.dnode);
proto_tree_add_item(ddp_tree, hf_ddp_src_node, offset + 9, 1, ddp.snode);
proto_tree_add_item(ddp_tree, hf_ddp_dst_socket, offset + 10, 1, ddp.dport);
proto_tree_add_item(ddp_tree, hf_ddp_src_socket, offset + 11, 1, ddp.sport);
proto_tree_add_item(ddp_tree, hf_ddp_type, offset + 12, 1, ddp.type);
}
offset += DDP_HEADER_SIZE;
}
void
proto_register_atalk(void)
{
static hf_register_info hf[] = {
{ &hf_ddp_hopcount,
{ "Hop count", "ddp.hopcount", FT_UINT8, BASE_DEC, NULL, 0x0,
"" }},
{ &hf_ddp_len,
{ "Datagram length", "ddp.len", FT_UINT16, BASE_DEC, NULL, 0x0,
"" }},
{ &hf_ddp_checksum,
{ "Checksum", "ddp.checksum", FT_UINT16, BASE_DEC, NULL, 0x0,
"" }},
{ &hf_ddp_dst_net,
{ "Destination Net", "ddp.dst.net", FT_UINT16, BASE_DEC, NULL, 0x0,
"" }},
{ &hf_ddp_src_net,
{ "Source Net", "ddp.src.net", FT_UINT16, BASE_DEC, NULL, 0x0,
"" }},
{ &hf_ddp_dst_node,
{ "Destination Node", "ddp.dst.node", FT_UINT8, BASE_DEC, NULL, 0x0,
"" }},
{ &hf_ddp_src_node,
{ "Source Node", "ddp.src.node", FT_UINT8, BASE_DEC, NULL, 0x0,
"" }},
{ &hf_ddp_dst_socket,
{ "Destination Socket", "ddp.dst.socket", FT_UINT8, BASE_DEC, NULL, 0x0,
"" }},
{ &hf_ddp_src_socket,
{ "Source Socket", "ddp.src.socket", FT_UINT8, BASE_DEC, NULL, 0x0,
"" }},
{ &hf_ddp_type,
{ "Protocol type", "ddp.type", FT_UINT8, BASE_DEC, NULL, 0x0,
"" }},
};
proto_ddp = proto_register_protocol("Datagram Delivery Protocol", "ddp");
proto_register_field_array(proto_ddp, hf, array_length(hf));
}