286 lines
8.3 KiB
C
286 lines
8.3 KiB
C
/* packet-aarp.c
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* Routines for Appletalk ARP packet disassembly
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*
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* $Id: packet-aarp.c,v 1.17 2000/03/12 04:47:33 gram Exp $
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*
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* Simon Wilkinson <sxw@dcs.ed.ac.uk>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#include <stdio.h>
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#include <glib.h>
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#include "packet.h"
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#include "etypes.h"
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static int proto_aarp = -1;
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static int hf_aarp_hard_type = -1;
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static int hf_aarp_proto_type = -1;
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static int hf_aarp_hard_size = -1;
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static int hf_aarp_proto_size = -1;
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static int hf_aarp_opcode = -1;
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static int hf_aarp_src_ether = -1;
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static int hf_aarp_src_id = -1;
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static int hf_aarp_dst_ether = -1;
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static int hf_aarp_dst_id = -1;
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static gint ett_aarp = -1;
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#ifndef AARP_REQUEST
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#define AARP_REQUEST 0x0001
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#endif
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#ifndef AARP_REPLY
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#define AARP_REPLY 0x0002
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#endif
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#ifndef AARP_PROBE
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#define AARP_PROBE 0x0003
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#endif
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/* The following is screwed up shit to deal with the fact that
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the linux kernel edits the packet inline. */
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#define AARP_REQUEST_SWAPPED 0x0100
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#define AARP_REPLY_SWAPPED 0x0200
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#define AARP_PROBE_SWAPPED 0x0300
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static const value_string op_vals[] = {
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{AARP_REQUEST, "request" },
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{AARP_REPLY, "reply" },
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{AARP_PROBE, "probe" },
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{AARP_REQUEST_SWAPPED, "request" },
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{AARP_REPLY_SWAPPED, "reply" },
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{AARP_PROBE_SWAPPED, "probe" },
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{0, NULL } };
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/* AARP protocol HARDWARE identifiers. */
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#define AARPHRD_ETHER 1 /* Ethernet 10Mbps */
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#define AARPHRD_TR 2 /* Token Ring */
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static const value_string hrd_vals[] = {
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{AARPHRD_ETHER, "Ethernet" },
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{AARPHRD_TR, "Token Ring" },
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{0, NULL } };
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static gchar *
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atalkid_to_str(const guint8 *ad) {
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gint node;
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static gchar str[3][16];
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static gchar *cur;
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if (cur == &str[0][0]) {
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cur = &str[1][0];
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} else if (cur == &str[1][0]) {
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cur = &str[2][0];
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} else {
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cur = &str[0][0];
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}
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node=ad[1]<<8|ad[2];
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sprintf(cur, "%d.%d",node,ad[3]);
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return cur;
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}
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static gchar *
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aarphrdaddr_to_str(guint8 *ad, int ad_len, guint16 type) {
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if ((type == AARPHRD_ETHER || type == AARPHRD_TR) && ad_len == 6) {
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/* Ethernet address (or Token Ring address, which is the same type
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of address). */
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return ether_to_str(ad);
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}
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return bytes_to_str(ad, ad_len);
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}
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static gchar *
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aarpproaddr_to_str(guint8 *ad, int ad_len, guint16 type) {
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if (type == ETHERTYPE_ATALK && ad_len == 4) {
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/* IP address. */
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return atalkid_to_str(ad);
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}
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return bytes_to_str(ad, ad_len);
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}
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/* Offsets of fields within an AARP packet. */
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#define AR_HRD 0
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#define AR_PRO 2
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#define AR_HLN 4
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#define AR_PLN 5
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#define AR_OP 6
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#define MIN_AARP_HEADER_SIZE 8
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void
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dissect_aarp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
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guint16 ar_hrd;
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guint16 ar_pro;
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guint8 ar_hln;
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guint8 ar_pln;
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guint16 ar_op;
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proto_tree *aarp_tree;
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proto_item *ti;
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gchar *op_str;
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int sha_offset, spa_offset, tha_offset, tpa_offset;
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gchar *sha_str, *spa_str, *tha_str, *tpa_str;
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if (!BYTES_ARE_IN_FRAME(offset, MIN_AARP_HEADER_SIZE)) {
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dissect_data(pd, offset, fd, tree);
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return;
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}
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ar_hrd = pntohs(&pd[offset + AR_HRD]);
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ar_pro = pntohs(&pd[offset + AR_PRO]);
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ar_hln = (guint8) pd[offset + AR_HLN];
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ar_pln = (guint8) pd[offset + AR_PLN];
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ar_op = pntohs(&pd[offset + AR_OP]);
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if (!BYTES_ARE_IN_FRAME(offset,
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MIN_AARP_HEADER_SIZE + ar_hln*2 + ar_pln*2)) {
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dissect_data(pd, offset, fd, tree);
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return;
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}
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/* Extract the addresses. */
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sha_offset = offset + MIN_AARP_HEADER_SIZE;
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sha_str = aarphrdaddr_to_str((guint8 *) &pd[sha_offset], ar_hln, ar_hrd);
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spa_offset = sha_offset + ar_hln;
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spa_str = aarpproaddr_to_str((guint8 *) &pd[spa_offset], ar_pln, ar_pro);
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tha_offset = spa_offset + ar_pln;
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tha_str = aarphrdaddr_to_str((guint8 *) &pd[tha_offset], ar_hln, ar_hrd);
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tpa_offset = tha_offset + ar_hln;
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tpa_str = aarpproaddr_to_str((guint8 *) &pd[tpa_offset], ar_pln, ar_pro);
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if(check_col(fd, COL_PROTOCOL))
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col_add_str(fd, COL_PROTOCOL, "AARP");
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if (check_col(fd, COL_INFO)) {
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switch (ar_op) {
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case AARP_REQUEST:
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case AARP_REQUEST_SWAPPED:
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col_add_fstr(fd, COL_INFO, "Who has %s? Tell %s", tpa_str, spa_str);
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break;
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case AARP_REPLY:
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case AARP_REPLY_SWAPPED:
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col_add_fstr(fd, COL_INFO, "%s is at %s", spa_str, sha_str);
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break;
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case AARP_PROBE:
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case AARP_PROBE_SWAPPED:
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col_add_fstr(fd, COL_INFO, "Is there a %s", tpa_str);
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break;
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default:
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col_add_fstr(fd, COL_INFO, "Unknown AARP opcode 0x%04x", ar_op);
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break;
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}
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}
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if (tree) {
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if ((op_str = match_strval(ar_op, op_vals)))
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ti = proto_tree_add_protocol_format(tree, proto_aarp, offset,
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MIN_AARP_HEADER_SIZE + 2*ar_hln +
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2*ar_pln, "AppleTalk Address Resolution Protocol (%s)", op_str);
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else
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ti = proto_tree_add_protocol_format(tree, proto_aarp, offset,
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MIN_AARP_HEADER_SIZE + 2*ar_hln +
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2*ar_pln,
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"AppleTalk Address Resolution Protocol (opcode 0x%04x)", ar_op);
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aarp_tree = proto_item_add_subtree(ti, ett_aarp);
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proto_tree_add_item(aarp_tree, hf_aarp_hard_type, offset + AR_HRD, 2,
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ar_hrd);
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proto_tree_add_item(aarp_tree, hf_aarp_proto_type, offset + AR_PRO, 2,
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ar_pro);
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proto_tree_add_item(aarp_tree, hf_aarp_hard_size, offset + AR_HLN, 1,
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ar_hln);
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proto_tree_add_item(aarp_tree, hf_aarp_proto_size, offset + AR_PLN, 1,
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ar_pln);
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proto_tree_add_item(aarp_tree, hf_aarp_opcode, offset + AR_OP, 2,
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ar_op);
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proto_tree_add_bytes_format(aarp_tree, hf_aarp_src_ether, sha_offset, ar_hln,
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&pd[sha_offset],
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"Sender hardware address: %s", sha_str);
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proto_tree_add_bytes_format(aarp_tree, hf_aarp_src_id, spa_offset, ar_pln,
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&pd[spa_offset],
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"Sender ID: %s", spa_str);
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proto_tree_add_bytes_format(aarp_tree, hf_aarp_dst_ether, tha_offset, ar_hln,
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&pd[tha_offset],
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"Target hardware address: %s", tha_str);
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proto_tree_add_bytes_format(aarp_tree, hf_aarp_dst_id, tpa_offset, ar_pln,
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&pd[tpa_offset],
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"Target ID: %s", tpa_str);
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}
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}
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void
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proto_register_aarp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_aarp_hard_type,
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{ "Hardware type", "aarp.hard.type",
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FT_UINT16, BASE_HEX, VALS(hrd_vals), 0x0,
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"" }},
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{ &hf_aarp_proto_type,
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{ "Protocol type", "aarp.proto.type",
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FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0,
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"" }},
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{ &hf_aarp_hard_size,
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{ "Hardware size", "aarp.hard.size",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"" }},
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{ &hf_aarp_proto_size,
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{ "Protocol size", "aarp.proto.size",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"" }},
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{ &hf_aarp_opcode,
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{ "Opcode", "aarp.opcode",
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FT_UINT16, BASE_DEC, VALS(op_vals), 0x0,
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"" }},
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{ &hf_aarp_src_ether,
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{ "Sender ether", "aarp.src.ether",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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"" }},
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{ &hf_aarp_src_id,
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{ "Sender ID", "aarp.src.id",
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FT_BYTES, BASE_HEX, NULL, 0x0,
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"" }},
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{ &hf_aarp_dst_ether,
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{ "Target ether", "aarp.dst.ether",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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"" }},
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{ &hf_aarp_dst_id,
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{ "Target ID", "aarp.dst.id",
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FT_BYTES, BASE_HEX, NULL, 0x0,
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"" }},
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};
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static gint *ett[] = {
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&ett_aarp,
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};
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proto_aarp = proto_register_protocol("Appletalk Address Resolution Protocol",
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"aarp");
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proto_register_field_array(proto_aarp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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