2 * Routines for Appletalk ARP packet disassembly
4 * $Id: packet-aarp.c,v 1.16 1999/12/10 00:45:15 nneul 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 /* The following is screwed up shit to deal with the fact that
60 the linux kernel edits the packet inline. */
61 #define AARP_REQUEST_SWAPPED 0x0100
62 #define AARP_REPLY_SWAPPED 0x0200
63 #define AARP_PROBE_SWAPPED 0x0300
65 static const value_string op_vals[] = {
66 {AARP_REQUEST, "request" },
67 {AARP_REPLY, "reply" },
68 {AARP_PROBE, "probe" },
69 {AARP_REQUEST_SWAPPED, "request" },
70 {AARP_REPLY_SWAPPED, "reply" },
71 {AARP_PROBE_SWAPPED, "probe" },
74 /* AARP protocol HARDWARE identifiers. */
75 #define AARPHRD_ETHER 1 /* Ethernet 10Mbps */
76 #define AARPHRD_TR 2 /* Token Ring */
78 static const value_string hrd_vals[] = {
79 {AARPHRD_ETHER, "Ethernet" },
80 {AARPHRD_TR, "Token Ring" },
84 atalkid_to_str(const guint8 *ad) {
86 static gchar str[3][16];
89 if (cur == &str[0][0]) {
91 } else if (cur == &str[1][0]) {
98 sprintf(cur, "%d.%d",node,ad[3]);
103 aarphrdaddr_to_str(guint8 *ad, int ad_len, guint16 type) {
104 if ((type == AARPHRD_ETHER || type == AARPHRD_TR) && ad_len == 6) {
105 /* Ethernet address (or Token Ring address, which is the same type
107 return ether_to_str(ad);
109 return bytes_to_str(ad, ad_len);
113 aarpproaddr_to_str(guint8 *ad, int ad_len, guint16 type) {
114 if (type == ETHERTYPE_ATALK && ad_len == 4) {
116 return atalkid_to_str(ad);
118 return bytes_to_str(ad, ad_len);
121 /* Offsets of fields within an AARP packet. */
127 #define MIN_AARP_HEADER_SIZE 8
130 dissect_aarp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
136 proto_tree *aarp_tree;
139 int sha_offset, spa_offset, tha_offset, tpa_offset;
140 gchar *sha_str, *spa_str, *tha_str, *tpa_str;
142 if (!BYTES_ARE_IN_FRAME(offset, MIN_AARP_HEADER_SIZE)) {
143 dissect_data(pd, offset, fd, tree);
147 ar_hrd = pntohs(&pd[offset + AR_HRD]);
148 ar_pro = pntohs(&pd[offset + AR_PRO]);
149 ar_hln = (guint8) pd[offset + AR_HLN];
150 ar_pln = (guint8) pd[offset + AR_PLN];
151 ar_op = pntohs(&pd[offset + AR_OP]);
153 if (!BYTES_ARE_IN_FRAME(offset,
154 MIN_AARP_HEADER_SIZE + ar_hln*2 + ar_pln*2)) {
155 dissect_data(pd, offset, fd, tree);
159 /* Extract the addresses. */
160 sha_offset = offset + MIN_AARP_HEADER_SIZE;
161 sha_str = aarphrdaddr_to_str((guint8 *) &pd[sha_offset], ar_hln, ar_hrd);
162 spa_offset = sha_offset + ar_hln;
163 spa_str = aarpproaddr_to_str((guint8 *) &pd[spa_offset], ar_pln, ar_pro);
164 tha_offset = spa_offset + ar_pln;
165 tha_str = aarphrdaddr_to_str((guint8 *) &pd[tha_offset], ar_hln, ar_hrd);
166 tpa_offset = tha_offset + ar_hln;
167 tpa_str = aarpproaddr_to_str((guint8 *) &pd[tpa_offset], ar_pln, ar_pro);
169 if(check_col(fd, COL_PROTOCOL))
170 col_add_str(fd, COL_PROTOCOL, "AARP");
172 if (check_col(fd, COL_INFO)) {
175 case AARP_REQUEST_SWAPPED:
176 col_add_fstr(fd, COL_INFO, "Who has %s? Tell %s", tpa_str, spa_str);
179 case AARP_REPLY_SWAPPED:
180 col_add_fstr(fd, COL_INFO, "%s is at %s", spa_str, sha_str);
183 case AARP_PROBE_SWAPPED:
184 col_add_fstr(fd, COL_INFO, "Is there a %s", tpa_str);
187 col_add_fstr(fd, COL_INFO, "Unknown AARP opcode 0x%04x", ar_op);
193 if ((op_str = match_strval(ar_op, op_vals)))
194 ti = proto_tree_add_item_format(tree, proto_aarp, offset,
195 MIN_AARP_HEADER_SIZE + 2*ar_hln +
196 2*ar_pln, NULL, "AppleTalk Address Resolution Protocol (%s)", op_str);
198 ti = proto_tree_add_item_format(tree, proto_aarp, offset,
199 MIN_AARP_HEADER_SIZE + 2*ar_hln +
201 "AppleTalk Address Resolution Protocol (opcode 0x%04x)", ar_op);
202 aarp_tree = proto_item_add_subtree(ti, ett_aarp);
203 proto_tree_add_item(aarp_tree, hf_aarp_hard_type, offset + AR_HRD, 2,
205 proto_tree_add_item(aarp_tree, hf_aarp_proto_type, offset + AR_PRO, 2,
207 proto_tree_add_item(aarp_tree, hf_aarp_hard_size, offset + AR_HLN, 1,
209 proto_tree_add_item(aarp_tree, hf_aarp_proto_size, offset + AR_PLN, 1,
211 proto_tree_add_item(aarp_tree, hf_aarp_opcode, offset + AR_OP, 2,
213 proto_tree_add_item_format(aarp_tree, hf_aarp_src_ether, sha_offset, ar_hln,
215 "Sender hardware address: %s", sha_str);
216 proto_tree_add_item_format(aarp_tree, hf_aarp_src_id, spa_offset, ar_pln,
218 "Sender ID: %s", spa_str);
219 proto_tree_add_item_format(aarp_tree, hf_aarp_dst_ether, tha_offset, ar_hln,
221 "Target hardware address: %s", tha_str);
222 proto_tree_add_item_format(aarp_tree, hf_aarp_dst_id, tpa_offset, ar_pln,
224 "Target ID: %s", tpa_str);
229 proto_register_aarp(void)
231 static hf_register_info hf[] = {
232 { &hf_aarp_hard_type,
233 { "Hardware type", "aarp.hard.type",
234 FT_UINT16, BASE_HEX, VALS(hrd_vals), 0x0,
237 { &hf_aarp_proto_type,
238 { "Protocol type", "aarp.proto.type",
239 FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0,
242 { &hf_aarp_hard_size,
243 { "Hardware size", "aarp.hard.size",
244 FT_UINT8, BASE_DEC, NULL, 0x0,
247 { &hf_aarp_proto_size,
248 { "Protocol size", "aarp.proto.size",
249 FT_UINT8, BASE_DEC, NULL, 0x0,
253 { "Opcode", "aarp.opcode",
254 FT_UINT16, BASE_DEC, VALS(op_vals), 0x0,
257 { &hf_aarp_src_ether,
258 { "Sender ether", "aarp.src.ether",
259 FT_BYTES, BASE_NONE, NULL, 0x0,
263 { "Sender ID", "aarp.src.id",
264 FT_BYTES, BASE_HEX, NULL, 0x0,
267 { &hf_aarp_dst_ether,
268 { "Target ether", "aarp.dst.ether",
269 FT_BYTES, BASE_NONE, NULL, 0x0,
273 { "Target ID", "aarp.dst.id",
274 FT_BYTES, BASE_HEX, NULL, 0x0,
277 static gint *ett[] = {
281 proto_aarp = proto_register_protocol("Appletalk Address Resolution Protocol",
283 proto_register_field_array(proto_aarp, hf, array_length(hf));
284 proto_register_subtree_array(ett, array_length(ett));