2 * Routines for Appletalk ARP packet disassembly
4 * $Id: packet-aarp.c,v 1.14 1999/11/16 11:42:23 guy Exp $
6 * Simon Wilkinson <sxw@dcs.ed.ac.uk>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 #ifdef HAVE_SYS_TYPES_H
28 # include <sys/types.h>
36 static int proto_aarp = -1;
37 static int hf_aarp_hard_type = -1;
38 static int hf_aarp_proto_type = -1;
39 static int hf_aarp_hard_size = -1;
40 static int hf_aarp_proto_size = -1;
41 static int hf_aarp_opcode = -1;
42 static int hf_aarp_src_ether = -1;
43 static int hf_aarp_src_id = -1;
44 static int hf_aarp_dst_ether = -1;
45 static int hf_aarp_dst_id = -1;
47 static gint ett_aarp = -1;
50 #define AARP_REQUEST 0x0001
53 #define AARP_REPLY 0x0002
56 #define AARP_PROBE 0x0003
59 static const value_string op_vals[] = {
60 {AARP_REQUEST, "AARP request" },
61 {AARP_REPLY, "AARP reply" },
62 {AARP_PROBE, "AARP probe" },
65 /* AARP protocol HARDWARE identifiers. */
66 #define AARPHRD_ETHER 1 /* Ethernet 10Mbps */
67 #define AARPHRD_TR 2 /* Token Ring */
69 static const value_string hrd_vals[] = {
70 {AARPHRD_ETHER, "Ethernet" },
71 {AARPHRD_TR, "Token Ring" },
75 atalkid_to_str(const guint8 *ad) {
77 static gchar str[3][16];
80 if (cur == &str[0][0]) {
82 } else if (cur == &str[1][0]) {
89 sprintf(cur, "%d.%d",node,ad[3]);
94 aarphrdaddr_to_str(guint8 *ad, int ad_len, guint16 type) {
95 if ((type == AARPHRD_ETHER || type == AARPHRD_TR) && ad_len == 6) {
96 /* Ethernet address (or Token Ring address, which is the same type
98 return ether_to_str(ad);
100 return bytes_to_str(ad, ad_len);
104 aarpproaddr_to_str(guint8 *ad, int ad_len, guint16 type) {
105 if (type == ETHERTYPE_ATALK && ad_len == 4) {
107 return atalkid_to_str(ad);
109 return bytes_to_str(ad, ad_len);
112 /* Offsets of fields within an AARP packet. */
118 #define MIN_AARP_HEADER_SIZE 8
121 dissect_aarp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
127 proto_tree *aarp_tree;
130 int sha_offset, spa_offset, tha_offset, tpa_offset;
131 gchar *sha_str, *spa_str, *tha_str, *tpa_str;
133 if (!BYTES_ARE_IN_FRAME(offset, MIN_AARP_HEADER_SIZE)) {
134 dissect_data(pd, offset, fd, tree);
138 ar_hrd = pntohs(&pd[offset + AR_HRD]);
139 ar_pro = pntohs(&pd[offset + AR_PRO]);
140 ar_hln = (guint8) pd[offset + AR_HLN];
141 ar_pln = (guint8) pd[offset + AR_PLN];
142 ar_op = pntohs(&pd[offset + AR_OP]);
144 if (!BYTES_ARE_IN_FRAME(offset,
145 MIN_AARP_HEADER_SIZE + ar_hln*2 + ar_pln*2)) {
146 dissect_data(pd, offset, fd, tree);
150 /* Extract the addresses. */
151 sha_offset = offset + MIN_AARP_HEADER_SIZE;
152 sha_str = aarphrdaddr_to_str((guint8 *) &pd[sha_offset], ar_hln, ar_hrd);
153 spa_offset = sha_offset + ar_hln;
154 spa_str = aarpproaddr_to_str((guint8 *) &pd[spa_offset], ar_pln, ar_pro);
155 tha_offset = spa_offset + ar_pln;
156 tha_str = aarphrdaddr_to_str((guint8 *) &pd[tha_offset], ar_hln, ar_hrd);
157 tpa_offset = tha_offset + ar_hln;
158 tpa_str = aarpproaddr_to_str((guint8 *) &pd[tpa_offset], ar_pln, ar_pro);
160 if(check_col(fd, COL_PROTOCOL))
161 col_add_str(fd, COL_PROTOCOL, "AARP");
163 if (check_col(fd, COL_INFO)) {
166 col_add_fstr(fd, COL_INFO, "Who has %s? Tell %s", tpa_str, spa_str);
169 col_add_fstr(fd, COL_INFO, "%s is at %s", spa_str, sha_str);
172 col_add_fstr(fd, COL_INFO, "Is there a %s", tpa_str);
175 col_add_fstr(fd, COL_INFO, "Unknown AARP opcode 0x%04x", ar_op);
181 if ((op_str = match_strval(ar_op, op_vals)))
182 ti = proto_tree_add_item_format(tree, proto_aarp, offset,
183 MIN_AARP_HEADER_SIZE + 2*ar_hln +
184 2*ar_pln, NULL, op_str);
186 ti = proto_tree_add_item_format(tree, proto_aarp, offset,
187 MIN_AARP_HEADER_SIZE + 2*ar_hln +
189 "Unknown AARP (opcode 0x%04x)", ar_op);
190 aarp_tree = proto_item_add_subtree(ti, ett_aarp);
191 proto_tree_add_item(aarp_tree, hf_aarp_hard_type, offset + AR_HRD, 2,
193 proto_tree_add_item(aarp_tree, hf_aarp_proto_type, offset + AR_PRO, 2,
195 proto_tree_add_item(aarp_tree, hf_aarp_hard_size, offset + AR_HLN, 1,
197 proto_tree_add_item(aarp_tree, hf_aarp_proto_size, offset + AR_PLN, 1,
199 proto_tree_add_item(aarp_tree, hf_aarp_opcode, offset + AR_OP, 2,
201 proto_tree_add_item_format(aarp_tree, hf_aarp_src_ether, sha_offset, ar_hln,
203 "Sender hardware address: %s", sha_str);
204 proto_tree_add_item_format(aarp_tree, hf_aarp_src_id, spa_offset, ar_pln,
206 "Sender ID: %s", spa_str);
207 proto_tree_add_item_format(aarp_tree, hf_aarp_dst_ether, tha_offset, ar_hln,
209 "Target hardware address: %s", tha_str);
210 proto_tree_add_item_format(aarp_tree, hf_aarp_dst_id, tpa_offset, ar_pln,
212 "Target ID: %s", tpa_str);
217 proto_register_aarp(void)
219 static hf_register_info hf[] = {
220 { &hf_aarp_hard_type,
221 { "Hardware type", "aarp.hard.type",
222 FT_UINT16, BASE_HEX, VALS(hrd_vals), 0x0,
225 { &hf_aarp_proto_type,
226 { "Protocol type", "aarp.proto.type",
227 FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0,
230 { &hf_aarp_hard_size,
231 { "Hardware size", "aarp.hard.size",
232 FT_UINT8, BASE_DEC, NULL, 0x0,
235 { &hf_aarp_proto_size,
236 { "Protocol size", "aarp.proto.size",
237 FT_UINT8, BASE_DEC, NULL, 0x0,
241 { "Opcode", "aarp.opcode",
242 FT_UINT16, BASE_DEC, VALS(op_vals), 0x0,
245 { &hf_aarp_src_ether,
246 { "Sender ether", "aarp.src.ether",
247 FT_BYTES, BASE_NONE, NULL, 0x0,
251 { "Sender ID", "aarp.src.id",
252 FT_BYTES, BASE_HEX, NULL, 0x0,
255 { &hf_aarp_dst_ether,
256 { "Target ether", "aarp.dst.ether",
257 FT_BYTES, BASE_NONE, NULL, 0x0,
261 { "Target ID", "aarp.dst.id",
262 FT_BYTES, BASE_HEX, NULL, 0x0,
265 static gint *ett[] = {
269 proto_aarp = proto_register_protocol("Appletalk Address Resolution Protocol",
271 proto_register_field_array(proto_aarp, hf, array_length(hf));
272 proto_register_subtree_array(ett, array_length(ett));