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wireshark/packet-arp.c
Guy Harris 077e70e0b7 Pull the code to dissect an ATM NSAP address out of "packet-q2931.c" and 
put it into a subroutine in "packet-arp.c", and call it from
"packet-q2931.c".

Add a "packet-arp.h" header to hold declarations of routines exported by
"packet-atm.c" (other than the ATM dissector itself), moving them out of
"packet.h".

Use the aforementioned NSAP dissector to display ATM addresses in NSAP
format, and display E.164 addresses as ASCII text (under the assumption
that they're presented as a string of IA5, i.e. ASCII, characters, just
as they are in Q.931).

svn path=/trunk/; revision=1124
1999-11-27 04:48:14 +00:00

796 lines
24 KiB
C
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/* packet-arp.c
* Routines for ARP packet disassembly
*
* $Id: packet-arp.c,v 1.24 1999/11/27 04:48:12 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
* Copyright 1998 Gerald Combs
*
*
* 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 "packet.h"
#include "packet-arp.h"
#include "etypes.h"
static int proto_arp = -1;
static int hf_arp_hard_type = -1;
static int hf_arp_proto_type = -1;
static int hf_arp_hard_size = -1;
static int hf_atmarp_shtl = -1;
static int hf_atmarp_ssl = -1;
static int hf_arp_proto_size = -1;
static int hf_arp_opcode = -1;
static int hf_atmarp_spln = -1;
static int hf_atmarp_thtl = -1;
static int hf_atmarp_tsl = -1;
static int hf_atmarp_tpln = -1;
static int hf_arp_src_ether = -1;
static int hf_arp_src_proto = -1;
static int hf_arp_dst_ether = -1;
static int hf_arp_dst_proto = -1;
static int hf_atmarp_src_atm_num_e164 = -1;
static int hf_atmarp_src_atm_num_nsap = -1;
static int hf_atmarp_src_atm_subaddr = -1;
static int hf_atmarp_dst_atm_num_e164 = -1;
static int hf_atmarp_dst_atm_num_nsap = -1;
static int hf_atmarp_dst_atm_subaddr = -1;
static gint ett_arp = -1;
static gint ett_atmarp_nsap = -1;
/* Definitions taken from Linux "linux/if_arp.h" header file, and from
http://www.isi.edu/in-notes/iana/assignments/arp-parameters
*/
/* ARP protocol HARDWARE identifiers. */
#define ARPHRD_NETROM 0 /* from KA9Q: NET/ROM pseudo */
#define ARPHRD_ETHER 1 /* Ethernet 10Mbps */
#define ARPHRD_EETHER 2 /* Experimental Ethernet */
#define ARPHRD_AX25 3 /* AX.25 Level 2 */
#define ARPHRD_PRONET 4 /* PROnet token ring */
#define ARPHRD_CHAOS 5 /* Chaosnet */
#define ARPHRD_IEEE802 6 /* IEEE 802.2 Ethernet/TR/TB */
#define ARPHRD_ARCNET 7 /* ARCnet */
#define ARPHRD_HYPERCH 8 /* Hyperchannel */
#define ARPHRD_LANSTAR 9 /* Lanstar */
#define ARPHRD_AUTONET 10 /* Autonet Short Address */
#define ARPHRD_LOCALTLK 11 /* Localtalk */
#define ARPHRD_LOCALNET 12 /* LocalNet (IBM PCNet/Sytek LocalNET) */
#define ARPHRD_ULTRALNK 13 /* Ultra link */
#define ARPHRD_SMDS 14 /* SMDS */
#define ARPHRD_DLCI 15 /* Frame Relay DLCI */
#define ARPHRD_ATM 16 /* ATM */
#define ARPHRD_HDLC 17 /* HDLC */
#define ARPHRD_FIBREC 18 /* Fibre Channel */
#define ARPHRD_ATM2225 19 /* ATM (RFC 2225) */
#define ARPHRD_SERIAL 20 /* Serial Line */
#define ARPHRD_ATM2 21 /* ATM */
#define ARPHRD_MS188220 22 /* MIL-STD-188-220 */
#define ARPHRD_METRICOM 23 /* Metricom STRIP */
#define ARPHRD_IEEE1394 24 /* IEEE 1394.1995 */
#define ARPHRD_MAPOS 25 /* MAPOS */
#define ARPHRD_TWINAX 26 /* Twinaxial */
#define ARPHRD_EUI_64 27 /* EUI-64 */
/* ARP / RARP structs and definitions */
#ifndef ARPOP_REQUEST
#define ARPOP_REQUEST 1 /* ARP request. */
#endif
#ifndef ARPOP_REPLY
#define ARPOP_REPLY 2 /* ARP reply. */
#endif
/* Some OSes have different names, or don't define these at all */
#ifndef ARPOP_RREQUEST
#define ARPOP_RREQUEST 3 /* RARP request. */
#endif
#ifndef ARPOP_RREPLY
#define ARPOP_RREPLY 4 /* RARP reply. */
#endif
#ifndef ARPOP_IREQUEST
#define ARPOP_IREQUEST 8 /* Inverse ARP (RFC 1293) request. */
#endif
#ifndef ARPOP_IREPLY
#define ARPOP_IREPLY 9 /* Inverse ARP reply. */
#endif
#ifndef ATMARPOP_NAK
#define ATMARPOP_NAK 10 /* ATMARP NAK. */
#endif
static const value_string op_vals[] = {
{ARPOP_REQUEST, "ARP request" },
{ARPOP_REPLY, "ARP reply" },
{ARPOP_RREQUEST, "RARP request"},
{ARPOP_RREPLY, "RARP reply" },
{ARPOP_IREQUEST, "Inverse ARP request"},
{ARPOP_IREPLY, "Inverse ARP reply" },
{0, NULL } };
static const value_string atmop_vals[] = {
{ARPOP_REQUEST, "ATMARP request" },
{ARPOP_REPLY, "ATMARP reply" },
{ARPOP_IREQUEST, "Inverse ATMARP request"},
{ARPOP_IREPLY, "Inverse ATMARP reply" },
{ATMARPOP_NAK, "ATMARP NAK" },
{0, NULL } };
#define ATMARP_IS_E164 0x40 /* bit in shtl/thtl for E.164 format */
#define ATMARP_LEN_MASK 0x3F /* length of address in shtl/thtl */
gchar *
arphrdaddr_to_str(guint8 *ad, int ad_len, guint16 type)
{
if (ad_len == 0)
return "<No address>";
if ((type == ARPHRD_ETHER || type == ARPHRD_EETHER || type == ARPHRD_IEEE802)
&& ad_len == 6) {
/* Ethernet address (or Experimental 3Mb Ethernet, or IEEE 802.x
address, which are the same type of address). */
return ether_to_str(ad);
}
return bytes_to_str(ad, ad_len);
}
static gchar *
arpproaddr_to_str(guint8 *ad, int ad_len, guint16 type)
{
if (ad_len == 0)
return "<No address>";
if (type == ETHERTYPE_IP && ad_len == 4) {
/* IPv4 address. */
return ip_to_str(ad);
}
return bytes_to_str(ad, ad_len);
}
#define N_ATMARPNUM_TO_STR_STRINGS 2
#define MAX_E164_STR_LEN 20
static gchar *
atmarpnum_to_str(guint8 *ad, int ad_tl)
{
int ad_len = ad_tl & ATMARP_LEN_MASK;
static gchar str[N_ATMARPNUM_TO_STR_STRINGS][MAX_E164_STR_LEN+3+1];
static int cur_idx;
gchar *cur;
if (ad_len == 0)
return "<No address>";
if (ad_tl & ATMARP_IS_E164) {
/*
* I'm assuming this means it's an ASCII (IA5) string.
*/
cur_idx++;
if (cur_idx >= N_ATMARPNUM_TO_STR_STRINGS)
cur_idx = 0;
cur = &str[cur_idx][0];
if (ad_len > MAX_E164_STR_LEN) {
/* Can't show it all. */
memcpy(cur, ad, MAX_E164_STR_LEN);
strcpy(&cur[MAX_E164_STR_LEN], "...");
} else {
memcpy(cur, ad, ad_len);
cur[ad_len + 1] = '\0';
}
return cur;
} else {
/*
* NSAP.
*
* XXX - break down into subcomponents.
*/
return bytes_to_str(ad, ad_len);
}
}
static gchar *
atmarpsubaddr_to_str(guint8 *ad, int ad_len)
{
if (ad_len == 0)
return "<No address>";
/*
* XXX - break down into subcomponents?
*/
return bytes_to_str(ad, ad_len);
}
static const value_string hrd_vals[] = {
{ARPHRD_NETROM, "NET/ROM pseudo" },
{ARPHRD_ETHER, "Ethernet" },
{ARPHRD_EETHER, "Experimental Ethernet"},
{ARPHRD_AX25, "AX.25" },
{ARPHRD_PRONET, "ProNET" },
{ARPHRD_CHAOS, "Chaos" },
{ARPHRD_IEEE802, "IEEE 802" },
{ARPHRD_ARCNET, "ARCNET" },
{ARPHRD_HYPERCH, "Hyperchannel" },
{ARPHRD_LANSTAR, "Lanstar" },
{ARPHRD_AUTONET, "Autonet Short Address"},
{ARPHRD_LOCALTLK, "Localtalk" },
{ARPHRD_LOCALNET, "LocalNet" },
{ARPHRD_ULTRALNK, "Ultra link" },
{ARPHRD_SMDS, "SMDS" },
{ARPHRD_DLCI, "Frame Relay DLCI" },
{ARPHRD_ATM, "ATM" },
{ARPHRD_HDLC, "HDLC" },
{ARPHRD_FIBREC, "Fibre Channel" },
{ARPHRD_ATM2225, "ATM (RFC 2225)" },
{ARPHRD_SERIAL, "Serial Line" },
{ARPHRD_ATM2, "ATM" },
{ARPHRD_MS188220, "MIL-STD-188-220" },
{ARPHRD_METRICOM, "Metricom STRIP" },
{ARPHRD_IEEE1394, "IEEE 1394.1995" },
{ARPHRD_MAPOS, "MAPOS" },
{ARPHRD_TWINAX, "Twinaxial" },
{ARPHRD_EUI_64, "EUI-64" },
{0, NULL } };
gchar *
arphrdtype_to_str(guint16 hwtype, const char *fmt) {
return val_to_str(hwtype, hrd_vals, fmt);
}
/* Offsets of fields within an ARP packet. */
#define AR_HRD 0
#define AR_PRO 2
#define AR_HLN 4
#define AR_PLN 5
#define AR_OP 6
#define MIN_ARP_HEADER_SIZE 8
/* Offsets of fields within an ATMARP packet. */
#define ATM_AR_HRD 0
#define ATM_AR_PRO 2
#define ATM_AR_SHTL 4
#define ATM_AR_SSL 5
#define ATM_AR_OP 6
#define ATM_AR_SPLN 8
#define ATM_AR_THTL 9
#define ATM_AR_TSL 10
#define ATM_AR_TPLN 11
#define MIN_ATMARP_HEADER_SIZE 12
static void
dissect_atm_number(const u_char *pd, int offset, int tl, int hf_e164,
int hf_nsap, proto_tree *tree)
{
int len = tl & ATMARP_LEN_MASK;
proto_item *ti;
proto_tree *nsap_tree;
if (tl & ATMARP_IS_E164)
proto_tree_add_item(tree, hf_e164, offset, len, &pd[offset]);
else {
ti = proto_tree_add_item(tree, hf_nsap, offset, len,
&pd[offset]);
if (len >= 20) {
nsap_tree = proto_item_add_subtree(ti, ett_atmarp_nsap);
dissect_atm_nsap(pd, offset, len, nsap_tree);
}
}
}
void
dissect_atm_nsap(const u_char *pd, int offset, int len, proto_tree *tree)
{
switch (pd[offset]) {
case 0x39: /* DCC ATM format */
case 0xBD: /* DCC ATM group format */
proto_tree_add_text(tree, offset + 0, 3,
"Data Country Code%s: 0x%04X",
(pd[offset] == 0xBD) ? " (group)" : "",
pntohs(&pd[offset + 1]));
proto_tree_add_text(tree, offset + 3, 10,
"High Order DSP: %s",
bytes_to_str(&pd[offset + 3], 10));
proto_tree_add_text(tree, offset + 13, 6,
"End System Identifier: %s",
bytes_to_str(&pd[offset + 13], 6));
proto_tree_add_text(tree, offset + 19, 1,
"Selector: 0x%02X", pd[offset + 19]);
break;
case 0x47: /* ICD ATM format */
case 0xC5: /* ICD ATM group format */
proto_tree_add_text(tree, offset + 0, 3,
"International Code Designator%s: 0x%04X",
(pd[offset] == 0xC5) ? " (group)" : "",
pntohs(&pd[offset + 1]));
proto_tree_add_text(tree, offset + 3, 10,
"High Order DSP: %s",
bytes_to_str(&pd[offset + 3], 10));
proto_tree_add_text(tree, offset + 13, 6,
"End System Identifier: %s",
bytes_to_str(&pd[offset + 13], 6));
proto_tree_add_text(tree, offset + 19, 1,
"Selector: 0x%02X", pd[offset + 19]);
break;
case 0x45: /* E.164 ATM format */
case 0xC3: /* E.164 ATM group format */
proto_tree_add_text(tree, offset + 0, 9,
"E.164 ISDN%s: %s",
(pd[offset] == 0xC3) ? " (group)" : "",
bytes_to_str(&pd[offset + 1], 8));
proto_tree_add_text(tree, offset + 9, 4,
"High Order DSP: %s",
bytes_to_str(&pd[offset + 3], 10));
proto_tree_add_text(tree, offset + 13, 6,
"End System Identifier: %s",
bytes_to_str(&pd[offset + 13], 6));
proto_tree_add_text(tree, offset + 19, 1,
"Selector: 0x%02X", pd[offset + 19]);
break;
default:
proto_tree_add_text(tree, offset, 1,
"Unknown AFI: 0x%02X", pd[offset]);
proto_tree_add_text(tree, offset + 1, len - 1,
"Rest of address: %s",
bytes_to_str(&pd[offset + 1], len - 1));
break;
}
}
/*
* RFC 2225 ATMARP - it's just like ARP, except where it isn't.
*/
static void
dissect_atmarp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
{
guint16 ar_hrd;
guint16 ar_pro;
guint8 ar_shtl;
guint8 ar_sht;
guint8 ar_shl;
guint8 ar_ssl;
guint16 ar_op;
guint8 ar_spln;
guint8 ar_thtl;
guint8 ar_tht;
guint8 ar_thl;
guint8 ar_tsl;
guint8 ar_tpln;
int tot_len;
proto_tree *arp_tree;
proto_item *ti;
gchar *op_str;
int sha_offset, ssa_offset, spa_offset;
int tha_offset, tsa_offset, tpa_offset;
gchar *sha_str, *ssa_str, *spa_str;
gchar *tha_str, *tsa_str, *tpa_str;
if (!BYTES_ARE_IN_FRAME(offset, MIN_ATMARP_HEADER_SIZE)) {
dissect_data(pd, offset, fd, tree);
return;
}
ar_hrd = pntohs(&pd[offset + ATM_AR_HRD]);
ar_pro = pntohs(&pd[offset + ATM_AR_PRO]);
ar_shtl = (guint8) pd[offset + ATM_AR_SHTL];
ar_sht = ar_shtl & ATMARP_IS_E164;
ar_shl = ar_shtl & ATMARP_LEN_MASK;
ar_ssl = (guint8) pd[offset + ATM_AR_SSL];
ar_op = pntohs(&pd[offset + AR_OP]);
ar_spln = (guint8) pd[offset + ATM_AR_SPLN];
ar_thtl = (guint8) pd[offset + ATM_AR_THTL];
ar_tht = ar_thtl & ATMARP_IS_E164;
ar_thl = ar_thtl & ATMARP_LEN_MASK;
ar_tsl = (guint8) pd[offset + ATM_AR_TSL];
ar_tpln = (guint8) pd[offset + ATM_AR_TPLN];
tot_len = MIN_ATMARP_HEADER_SIZE + ar_shtl + ar_ssl + ar_spln +
ar_thtl + ar_tsl + ar_tpln;
if (!BYTES_ARE_IN_FRAME(offset, tot_len)) {
dissect_data(pd, offset, fd, tree);
return;
}
/* Extract the addresses. */
sha_offset = offset + MIN_ATMARP_HEADER_SIZE;
if (ar_shl != 0)
sha_str = atmarpnum_to_str((guint8 *) &pd[sha_offset], ar_shtl);
else
sha_str = "<No address>";
ssa_offset = sha_offset + ar_shl;
if (ar_ssl != 0)
ssa_str = atmarpsubaddr_to_str((guint8 *) &pd[ssa_offset], ar_ssl);
else
ssa_str = NULL;
spa_offset = ssa_offset + ar_ssl;
spa_str = arpproaddr_to_str((guint8 *) &pd[spa_offset], ar_spln, ar_pro);
tha_offset = spa_offset + ar_spln;
if (ar_thl != 0)
tha_str = atmarpnum_to_str((guint8 *) &pd[tha_offset], ar_thtl);
else
tha_str = "<No address>";
tsa_offset = tha_offset + ar_thl;
if (ar_tsl != 0)
tsa_str = atmarpsubaddr_to_str((guint8 *) &pd[tsa_offset], ar_tsl);
else
tsa_str = NULL;
tpa_offset = tsa_offset + ar_tsl;
tpa_str = arpproaddr_to_str((guint8 *) &pd[tpa_offset], ar_tpln, ar_pro);
if (check_col(fd, COL_PROTOCOL)) {
switch (ar_op) {
case ARPOP_REQUEST:
case ARPOP_REPLY:
case ATMARPOP_NAK:
default:
col_add_str(fd, COL_PROTOCOL, "ATMARP");
break;
case ARPOP_RREQUEST:
case ARPOP_RREPLY:
col_add_str(fd, COL_PROTOCOL, "ATMRARP");
break;
case ARPOP_IREQUEST:
case ARPOP_IREPLY:
col_add_str(fd, COL_PROTOCOL, "Inverse ATMARP");
break;
}
}
if (check_col(fd, COL_INFO)) {
switch (ar_op) {
case ARPOP_REQUEST:
col_add_fstr(fd, COL_INFO, "Who has %s? Tell %s", tpa_str, spa_str);
break;
case ARPOP_REPLY:
col_add_fstr(fd, COL_INFO, "%s is at %s%s%s", spa_str, sha_str,
((ssa_str != NULL) ? "," : ""),
((ssa_str != NULL) ? ssa_str : ""));
break;
case ARPOP_IREQUEST:
col_add_fstr(fd, COL_INFO, "Who is %s%s%s? Tell %s%s%s", tha_str,
((tsa_str != NULL) ? "," : ""),
((tsa_str != NULL) ? tsa_str : ""),
sha_str,
((ssa_str != NULL) ? "," : ""),
((ssa_str != NULL) ? ssa_str : ""));
break;
case ARPOP_IREPLY:
col_add_fstr(fd, COL_INFO, "%s%s%s is at %s", sha_str,
((ssa_str != NULL) ? "," : ""),
((ssa_str != NULL) ? ssa_str : ""),
spa_str);
break;
case ATMARPOP_NAK:
col_add_fstr(fd, COL_INFO, "I don't know where %s is", spa_str);
break;
default:
col_add_fstr(fd, COL_INFO, "Unknown ATMARP opcode 0x%04x", ar_op);
break;
}
}
if (tree) {
if ((op_str = match_strval(ar_op, atmop_vals)))
ti = proto_tree_add_item_format(tree, proto_arp, offset, tot_len,
NULL, op_str);
else
ti = proto_tree_add_item_format(tree, proto_arp, offset, tot_len,
NULL,
"Unknown ATMARP (opcode 0x%04x)", ar_op);
arp_tree = proto_item_add_subtree(ti, ett_arp);
proto_tree_add_item(arp_tree, hf_arp_hard_type, offset + ATM_AR_HRD, 2,
ar_hrd);
proto_tree_add_item(arp_tree, hf_arp_proto_type, offset + ATM_AR_PRO, 2,
ar_pro);
proto_tree_add_item(arp_tree, hf_atmarp_shtl, offset + ATM_AR_SHTL, 1,
ar_shtl);
proto_tree_add_item(arp_tree, hf_atmarp_ssl, offset + ATM_AR_SSL, 1,
ar_ssl);
proto_tree_add_item(arp_tree, hf_arp_opcode, offset + AR_OP, 2,
ar_op);
proto_tree_add_item(arp_tree, hf_atmarp_spln, offset + ATM_AR_SPLN, 1,
ar_spln);
proto_tree_add_item(arp_tree, hf_atmarp_thtl, offset + ATM_AR_THTL, 1,
ar_thtl);
proto_tree_add_item(arp_tree, hf_atmarp_tsl, offset + ATM_AR_TSL, 1,
ar_tsl);
proto_tree_add_item(arp_tree, hf_atmarp_tpln, offset + ATM_AR_TPLN, 1,
ar_tpln);
if (ar_shl != 0)
dissect_atm_number(pd, sha_offset, ar_shtl, hf_atmarp_src_atm_num_e164,
hf_atmarp_src_atm_num_nsap, arp_tree);
if (ar_ssl != 0)
proto_tree_add_item_format(arp_tree, hf_atmarp_src_atm_subaddr, ssa_offset,
ar_ssl,
&pd[ssa_offset],
"Sender ATM subaddress: %s", ssa_str);
if (ar_spln != 0)
proto_tree_add_item_format(arp_tree, hf_arp_src_proto, spa_offset, ar_spln,
&pd[spa_offset],
"Sender protocol address: %s", spa_str);
if (ar_thl != 0)
dissect_atm_number(pd, tha_offset, ar_thtl, hf_atmarp_dst_atm_num_e164,
hf_atmarp_dst_atm_num_nsap, arp_tree);
if (ar_tsl != 0)
proto_tree_add_item_format(arp_tree, hf_atmarp_dst_atm_subaddr, tsa_offset,
ar_tsl,
&pd[tsa_offset],
"Target ATM subaddress: %s", tsa_str);
if (ar_tpln != 0)
proto_tree_add_item_format(arp_tree, hf_arp_dst_proto, tpa_offset, ar_tpln,
&pd[tpa_offset],
"Target protocol address: %s", tpa_str);
}
}
void
dissect_arp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
{
guint16 ar_hrd;
guint16 ar_pro;
guint8 ar_hln;
guint8 ar_pln;
guint16 ar_op;
int tot_len;
proto_tree *arp_tree;
proto_item *ti;
gchar *op_str;
int sha_offset, spa_offset, tha_offset, tpa_offset;
gchar *sha_str, *spa_str, *tha_str, *tpa_str;
if (!BYTES_ARE_IN_FRAME(offset, MIN_ARP_HEADER_SIZE)) {
dissect_data(pd, offset, fd, tree);
return;
}
ar_hrd = pntohs(&pd[offset + AR_HRD]);
if (ar_hrd == ARPHRD_ATM2225) {
dissect_atmarp(pd, offset, fd, tree);
return;
}
ar_pro = pntohs(&pd[offset + AR_PRO]);
ar_hln = (guint8) pd[offset + AR_HLN];
ar_pln = (guint8) pd[offset + AR_PLN];
ar_op = pntohs(&pd[offset + AR_OP]);
tot_len = MIN_ARP_HEADER_SIZE + ar_hln*2 + ar_pln*2;
if (!BYTES_ARE_IN_FRAME(offset, tot_len)) {
dissect_data(pd, offset, fd, tree);
return;
}
/* Extract the addresses. */
sha_offset = offset + MIN_ARP_HEADER_SIZE;
sha_str = arphrdaddr_to_str((guint8 *) &pd[sha_offset], ar_hln, ar_hrd);
spa_offset = sha_offset + ar_hln;
spa_str = arpproaddr_to_str((guint8 *) &pd[spa_offset], ar_pln, ar_pro);
tha_offset = spa_offset + ar_pln;
tha_str = arphrdaddr_to_str((guint8 *) &pd[tha_offset], ar_hln, ar_hrd);
tpa_offset = tha_offset + ar_hln;
tpa_str = arpproaddr_to_str((guint8 *) &pd[tpa_offset], ar_pln, ar_pro);
if (check_col(fd, COL_PROTOCOL)) {
switch (ar_op) {
case ARPOP_REQUEST:
case ARPOP_REPLY:
default:
col_add_str(fd, COL_PROTOCOL, "ARP");
break;
case ARPOP_RREQUEST:
case ARPOP_RREPLY:
col_add_str(fd, COL_PROTOCOL, "RARP");
break;
case ARPOP_IREQUEST:
case ARPOP_IREPLY:
col_add_str(fd, COL_PROTOCOL, "Inverse ARP");
break;
}
}
if (check_col(fd, COL_INFO)) {
switch (ar_op) {
case ARPOP_REQUEST:
col_add_fstr(fd, COL_INFO, "Who has %s? Tell %s", tpa_str, spa_str);
break;
case ARPOP_REPLY:
col_add_fstr(fd, COL_INFO, "%s is at %s", spa_str, sha_str);
break;
case ARPOP_RREQUEST:
case ARPOP_IREQUEST:
col_add_fstr(fd, COL_INFO, "Who is %s? Tell %s", tha_str, sha_str);
break;
case ARPOP_RREPLY:
case ARPOP_IREPLY:
col_add_fstr(fd, COL_INFO, "%s is at %s", sha_str, spa_str);
break;
default:
col_add_fstr(fd, COL_INFO, "Unknown ARP opcode 0x%04x", ar_op);
break;
}
}
if (tree) {
if ((op_str = match_strval(ar_op, op_vals)))
ti = proto_tree_add_item_format(tree, proto_arp, offset, tot_len,
NULL, op_str);
else
ti = proto_tree_add_item_format(tree, proto_arp, offset, tot_len,
NULL,
"Unknown ARP (opcode 0x%04x)", ar_op);
arp_tree = proto_item_add_subtree(ti, ett_arp);
proto_tree_add_item(arp_tree, hf_arp_hard_type, offset + AR_HRD, 2,
ar_hrd);
proto_tree_add_item(arp_tree, hf_arp_proto_type, offset + AR_PRO, 2,
ar_pro);
proto_tree_add_item(arp_tree, hf_arp_hard_size, offset + AR_HLN, 1,
ar_hln);
proto_tree_add_item(arp_tree, hf_arp_proto_size, offset + AR_PLN, 1,
ar_pln);
proto_tree_add_item(arp_tree, hf_arp_opcode, offset + AR_OP, 2,
ar_op);
if (ar_hln != 0)
proto_tree_add_item_format(arp_tree, hf_arp_src_ether, sha_offset, ar_hln,
&pd[sha_offset],
"Sender hardware address: %s", sha_str);
if (ar_pln != 0)
proto_tree_add_item_format(arp_tree, hf_arp_src_proto, spa_offset, ar_pln,
&pd[spa_offset],
"Sender protocol address: %s", spa_str);
if (ar_hln != 0)
proto_tree_add_item_format(arp_tree, hf_arp_dst_ether, tha_offset, ar_hln,
&pd[tha_offset],
"Target hardware address: %s", tha_str);
if (ar_pln != 0)
proto_tree_add_item_format(arp_tree, hf_arp_dst_proto, tpa_offset, ar_pln,
&pd[tpa_offset],
"Target protocol address: %s", tpa_str);
}
}
void
proto_register_arp(void)
{
static hf_register_info hf[] = {
{ &hf_arp_hard_type,
{ "Hardware type", "arp.hw.type",
FT_UINT16, BASE_HEX, VALS(hrd_vals), 0x0,
"" }},
{ &hf_arp_proto_type,
{ "Protocol type", "arp.proto.type",
FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0,
"" }},
{ &hf_arp_hard_size,
{ "Hardware size", "arp.hw.size",
FT_UINT8, BASE_DEC, NULL, 0x0,
"" }},
{ &hf_atmarp_shtl,
{ "Sender ATM number type and length", "arp.src.htl",
FT_UINT8, BASE_DEC, NULL, 0x0,
"" }},
{ &hf_atmarp_ssl,
{ "Sender ATM subaddress length", "arp.src.slen",
FT_UINT8, BASE_DEC, NULL, 0x0,
"" }},
{ &hf_arp_proto_size,
{ "Protocol size", "arp.proto.size",
FT_UINT8, BASE_DEC, NULL, 0x0,
"" }},
{ &hf_arp_opcode,
{ "Opcode", "arp.opcode",
FT_UINT16, BASE_HEX, VALS(op_vals), 0x0,
"" }},
{ &hf_atmarp_spln,
{ "Sender protocol size", "arp.src.pln",
FT_UINT8, BASE_DEC, NULL, 0x0,
"" }},
{ &hf_atmarp_thtl,
{ "Target ATM number type and length", "arp.dst.htl",
FT_UINT8, BASE_DEC, NULL, 0x0,
"" }},
{ &hf_atmarp_tsl,
{ "Target ATM subaddress length", "arp.dst.slen",
FT_UINT8, BASE_DEC, NULL, 0x0,
"" }},
{ &hf_atmarp_tpln,
{ "Target protocol size", "arp.dst.pln",
FT_UINT8, BASE_DEC, NULL, 0x0,
"" }},
{ &hf_arp_src_ether,
{ "Sender hardware address", "arp.src.hw",
FT_BYTES, BASE_NONE, NULL, 0x0,
"" }},
{ &hf_atmarp_src_atm_num_e164,
{ "Sender ATM number (E.164)", "arp.src.atm_num_e164",
FT_STRING, BASE_NONE, NULL, 0x0,
"" }},
{ &hf_atmarp_src_atm_num_nsap,
{ "Sender ATM number (NSAP)", "arp.src.atm_num_nsap",
FT_BYTES, BASE_NONE, NULL, 0x0,
"" }},
{ &hf_atmarp_src_atm_subaddr,
{ "Sender ATM subaddress", "arp.src.atm_subaddr",
FT_BYTES, BASE_NONE, NULL, 0x0,
"" }},
{ &hf_arp_src_proto,
{ "Sender protocol address", "arp.src.proto",
FT_BYTES, BASE_NONE, NULL, 0x0,
"" }},
{ &hf_arp_dst_ether,
{ "Target hardware address", "arp.dst.hw",
FT_BYTES, BASE_NONE, NULL, 0x0,
"" }},
{ &hf_atmarp_dst_atm_num_e164,
{ "Target ATM number (E.164)", "arp.dst.atm_num_e164",
FT_STRING, BASE_NONE, NULL, 0x0,
"" }},
{ &hf_atmarp_dst_atm_num_nsap,
{ "Target ATM number (NSAP)", "arp.dst.atm_num_nsap",
FT_BYTES, BASE_NONE, NULL, 0x0,
"" }},
{ &hf_atmarp_dst_atm_subaddr,
{ "Target ATM subaddress", "arp.dst.atm_subaddr",
FT_BYTES, BASE_NONE, NULL, 0x0,
"" }},
{ &hf_arp_dst_proto,
{ "Target protocol address", "arp.dst.proto",
FT_BYTES, BASE_NONE, NULL, 0x0,
"" }}
};
static gint *ett[] = {
&ett_arp,
&ett_atmarp_nsap,
};
proto_arp = proto_register_protocol("Address Resolution Protocol", "arp");
proto_register_field_array(proto_arp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
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