2 * Routines for Appletalk ARP packet disassembly
4 * $Id: packet-aarp.c,v 1.33 2001/12/10 00:25:25 guy Exp $
6 * Simon Wilkinson <sxw@dcs.ed.ac.uk>
8 * Ethereal - Network traffic analyzer
9 * By Gerald Combs <gerald@ethereal.com>
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
31 #ifdef HAVE_SYS_TYPES_H
32 # include <sys/types.h>
41 static int proto_aarp = -1;
42 static int hf_aarp_hard_type = -1;
43 static int hf_aarp_proto_type = -1;
44 static int hf_aarp_hard_size = -1;
45 static int hf_aarp_proto_size = -1;
46 static int hf_aarp_opcode = -1;
47 static int hf_aarp_src_ether = -1;
48 static int hf_aarp_src_id = -1;
49 static int hf_aarp_dst_ether = -1;
50 static int hf_aarp_dst_id = -1;
52 static gint ett_aarp = -1;
55 #define AARP_REQUEST 0x0001
58 #define AARP_REPLY 0x0002
61 #define AARP_PROBE 0x0003
64 /* The following is screwed up shit to deal with the fact that
65 the linux kernel edits the packet inline. */
66 #define AARP_REQUEST_SWAPPED 0x0100
67 #define AARP_REPLY_SWAPPED 0x0200
68 #define AARP_PROBE_SWAPPED 0x0300
70 static const value_string op_vals[] = {
71 {AARP_REQUEST, "request" },
72 {AARP_REPLY, "reply" },
73 {AARP_PROBE, "probe" },
74 {AARP_REQUEST_SWAPPED, "request" },
75 {AARP_REPLY_SWAPPED, "reply" },
76 {AARP_PROBE_SWAPPED, "probe" },
79 /* AARP protocol HARDWARE identifiers. */
80 #define AARPHRD_ETHER 1 /* Ethernet 10Mbps */
81 #define AARPHRD_TR 2 /* Token Ring */
83 static const value_string hrd_vals[] = {
84 {AARPHRD_ETHER, "Ethernet" },
85 {AARPHRD_TR, "Token Ring" },
89 atalkid_to_str(const guint8 *ad) {
91 static gchar str[3][16];
94 if (cur == &str[0][0]) {
96 } else if (cur == &str[1][0]) {
103 sprintf(cur, "%d.%d",node,ad[3]);
108 aarphrdaddr_to_str(const guint8 *ad, int ad_len, guint16 type) {
109 if ((type == AARPHRD_ETHER || type == AARPHRD_TR) && ad_len == 6) {
110 /* Ethernet address (or Token Ring address, which is the same type
112 return ether_to_str(ad);
114 return bytes_to_str(ad, ad_len);
118 aarpproaddr_to_str(const guint8 *ad, int ad_len, guint16 type) {
119 if (type == ETHERTYPE_ATALK && ad_len == 4) {
121 return atalkid_to_str(ad);
123 return bytes_to_str(ad, ad_len);
126 /* Offsets of fields within an AARP packet. */
132 #define MIN_AARP_HEADER_SIZE 8
135 dissect_aarp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) {
141 proto_tree *aarp_tree;
144 int sha_offset, spa_offset, tha_offset, tpa_offset;
145 const guint8 *sha_val, *spa_val, *tha_val, *tpa_val;
146 gchar *sha_str, *spa_str, *tha_str, *tpa_str;
148 if(check_col(pinfo->cinfo, COL_PROTOCOL))
149 col_set_str(pinfo->cinfo, COL_PROTOCOL, "AARP");
150 if(check_col(pinfo->cinfo, COL_INFO))
151 col_clear(pinfo->cinfo, COL_INFO);
153 ar_hrd = tvb_get_ntohs(tvb, AR_HRD);
154 ar_pro = tvb_get_ntohs(tvb, AR_PRO);
155 ar_hln = tvb_get_guint8(tvb, AR_HLN);
156 ar_pln = tvb_get_guint8(tvb, AR_PLN);
157 ar_op = tvb_get_ntohs(tvb, AR_OP);
159 /* Extract the addresses. */
160 sha_offset = MIN_AARP_HEADER_SIZE;
161 sha_val = tvb_get_ptr(tvb, sha_offset, ar_hln);
162 sha_str = aarphrdaddr_to_str(sha_val, ar_hln, ar_hrd);
164 spa_offset = sha_offset + ar_hln;
165 spa_val = tvb_get_ptr(tvb, spa_offset, ar_pln);
166 spa_str = aarpproaddr_to_str(spa_val, ar_pln, ar_pro);
168 tha_offset = spa_offset + ar_pln;
169 tha_val = tvb_get_ptr(tvb, tha_offset, ar_hln);
170 tha_str = aarphrdaddr_to_str(tha_val, ar_hln, ar_hrd);
172 tpa_offset = tha_offset + ar_hln;
173 tpa_val = tvb_get_ptr(tvb, tpa_offset, ar_pln);
174 tpa_str = aarpproaddr_to_str(tpa_val, ar_pln, ar_pro);
176 if (check_col(pinfo->cinfo, COL_INFO)) {
179 case AARP_REQUEST_SWAPPED:
180 col_add_fstr(pinfo->cinfo, COL_INFO, "Who has %s? Tell %s", tpa_str, spa_str);
183 case AARP_REPLY_SWAPPED:
184 col_add_fstr(pinfo->cinfo, COL_INFO, "%s is at %s", spa_str, sha_str);
187 case AARP_PROBE_SWAPPED:
188 col_add_fstr(pinfo->cinfo, COL_INFO, "Is there a %s", tpa_str);
191 col_add_fstr(pinfo->cinfo, COL_INFO, "Unknown AARP opcode 0x%04x", ar_op);
197 if ((op_str = match_strval(ar_op, op_vals)))
198 ti = proto_tree_add_protocol_format(tree, proto_aarp, tvb, 0,
199 MIN_AARP_HEADER_SIZE + 2*ar_hln +
200 2*ar_pln, "AppleTalk Address Resolution Protocol (%s)", op_str);
202 ti = proto_tree_add_protocol_format(tree, proto_aarp, tvb, 0,
203 MIN_AARP_HEADER_SIZE + 2*ar_hln +
205 "AppleTalk Address Resolution Protocol (opcode 0x%04x)", ar_op);
206 aarp_tree = proto_item_add_subtree(ti, ett_aarp);
207 proto_tree_add_uint(aarp_tree, hf_aarp_hard_type, tvb, AR_HRD, 2,
209 proto_tree_add_uint(aarp_tree, hf_aarp_proto_type, tvb, AR_PRO, 2,
211 proto_tree_add_uint(aarp_tree, hf_aarp_hard_size, tvb, AR_HLN, 1,
213 proto_tree_add_uint(aarp_tree, hf_aarp_proto_size, tvb, AR_PLN, 1,
215 proto_tree_add_uint(aarp_tree, hf_aarp_opcode, tvb, AR_OP, 2,
217 proto_tree_add_bytes_format(aarp_tree, hf_aarp_src_ether, tvb, sha_offset, ar_hln,
219 "Sender hardware address: %s", sha_str);
220 proto_tree_add_bytes_format(aarp_tree, hf_aarp_src_id, tvb, spa_offset, ar_pln,
222 "Sender ID: %s", spa_str);
223 proto_tree_add_bytes_format(aarp_tree, hf_aarp_dst_ether, tvb, tha_offset, ar_hln,
225 "Target hardware address: %s", tha_str);
226 proto_tree_add_bytes_format(aarp_tree, hf_aarp_dst_id, tvb, tpa_offset, ar_pln,
228 "Target ID: %s", tpa_str);
233 proto_register_aarp(void)
235 static hf_register_info hf[] = {
236 { &hf_aarp_hard_type,
237 { "Hardware type", "aarp.hard.type",
238 FT_UINT16, BASE_HEX, VALS(hrd_vals), 0x0,
241 { &hf_aarp_proto_type,
242 { "Protocol type", "aarp.proto.type",
243 FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0,
246 { &hf_aarp_hard_size,
247 { "Hardware size", "aarp.hard.size",
248 FT_UINT8, BASE_DEC, NULL, 0x0,
251 { &hf_aarp_proto_size,
252 { "Protocol size", "aarp.proto.size",
253 FT_UINT8, BASE_DEC, NULL, 0x0,
257 { "Opcode", "aarp.opcode",
258 FT_UINT16, BASE_DEC, VALS(op_vals), 0x0,
261 { &hf_aarp_src_ether,
262 { "Sender ether", "aarp.src.ether",
263 FT_BYTES, BASE_NONE, NULL, 0x0,
267 { "Sender ID", "aarp.src.id",
268 FT_BYTES, BASE_HEX, NULL, 0x0,
271 { &hf_aarp_dst_ether,
272 { "Target ether", "aarp.dst.ether",
273 FT_BYTES, BASE_NONE, NULL, 0x0,
277 { "Target ID", "aarp.dst.id",
278 FT_BYTES, BASE_HEX, NULL, 0x0,
281 static gint *ett[] = {
285 proto_aarp = proto_register_protocol("Appletalk Address Resolution Protocol",
288 proto_register_field_array(proto_aarp, hf, array_length(hf));
289 proto_register_subtree_array(ett, array_length(ett));
293 proto_reg_handoff_aarp(void)
295 dissector_handle_t aarp_handle;
297 aarp_handle = create_dissector_handle(dissect_aarp, proto_aarp);
298 dissector_add("ethertype", ETHERTYPE_AARP, aarp_handle);
299 dissector_add("chdlctype", ETHERTYPE_AARP, aarp_handle);