/* packet-aarp.c
* Routines for Appletalk ARP packet disassembly
*
- * $Id: packet-aarp.c,v 1.11 1999/10/12 06:20:00 gram Exp $
+ * $Id: packet-aarp.c,v 1.37 2002/08/28 21:00:06 jmayer Exp $
*
* Simon Wilkinson <sxw@dcs.ed.ac.uk>
*
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@ethereal.com>
+ * Copyright 1998
+ *
* 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.
# include "config.h"
#endif
-#ifdef HAVE_SYS_TYPES_H
-# include <sys/types.h>
-#endif
-
#include <stdio.h>
#include <glib.h>
-#include "packet.h"
+#include <epan/packet.h>
+#include <epan/strutil.h>
#include "etypes.h"
static int proto_aarp = -1;
static int hf_aarp_hard_size = -1;
static int hf_aarp_proto_size = -1;
static int hf_aarp_opcode = -1;
-static int hf_aarp_src_ether = -1;
-static int hf_aarp_src_id = -1;
-static int hf_aarp_dst_ether = -1;
-static int hf_aarp_dst_id = -1;
-
-typedef struct _e_ether_aarp {
- guint16 htype, ptype;
- guint8 halen, palen;
- guint16 op;
- guint8 hsaddr[6];
- guint8 psaddr[4];
- guint8 hdaddr[6];
- guint8 pdaddr[4];
-} e_ether_aarp;
+static int hf_aarp_src_hw = -1;
+static int hf_aarp_src_hw_mac = -1;
+static int hf_aarp_src_proto = -1;
+static int hf_aarp_src_proto_id = -1;
+static int hf_aarp_dst_hw = -1;
+static int hf_aarp_dst_hw_mac = -1;
+static int hf_aarp_dst_proto = -1;
+static int hf_aarp_dst_proto_id = -1;
+
+static gint ett_aarp = -1;
#ifndef AARP_REQUEST
#define AARP_REQUEST 0x0001
#ifndef AARP_REPLY
#define AARP_REPLY 0x0002
#endif
-#ifndef AARP_PROBE
+#ifndef AARP_PROBE
#define AARP_PROBE 0x0003
#endif
-gchar *
-atalkid_to_str(guint8 *ad) {
+/* The following is screwed up shit to deal with the fact that
+ the linux kernel edits the packet inline. */
+#define AARP_REQUEST_SWAPPED 0x0100
+#define AARP_REPLY_SWAPPED 0x0200
+#define AARP_PROBE_SWAPPED 0x0300
+
+static const value_string op_vals[] = {
+ {AARP_REQUEST, "request" },
+ {AARP_REPLY, "reply" },
+ {AARP_PROBE, "probe" },
+ {AARP_REQUEST_SWAPPED, "request" },
+ {AARP_REPLY_SWAPPED, "reply" },
+ {AARP_PROBE_SWAPPED, "probe" },
+ {0, NULL } };
+
+/* AARP protocol HARDWARE identifiers. */
+#define AARPHRD_ETHER 1 /* Ethernet 10Mbps */
+#define AARPHRD_TR 2 /* Token Ring */
+
+static const value_string hrd_vals[] = {
+ {AARPHRD_ETHER, "Ethernet" },
+ {AARPHRD_TR, "Token Ring" },
+ {0, NULL } };
+
+/*
+ * Given the hardware address type and length, check whether an address
+ * is an Ethernet address - the address must be of type "Ethernet" or
+ * "Token Ring", and the length must be 6 bytes.
+ */
+#define AARP_HW_IS_ETHER(ar_hrd, ar_hln) \
+ (((ar_hrd) == AARPHRD_ETHER || (ar_hrd) == AARPHRD_TR) \
+ && (ar_hln) == 6)
+
+/*
+ * Given the protocol address type and length, check whether an address
+ * is an Appletalk address - the address must be of type "Appletalk",
+ * and the length must be 4 bytes.
+ */
+#define AARP_PRO_IS_ATALK(ar_pro, ar_pln) \
+ ((ar_pro) == ETHERTYPE_ATALK && (ar_pln) == 4)
+
+static gchar *
+atalkid_to_str(const guint8 *ad) {
gint node;
static gchar str[3][16];
static gchar *cur;
-
+
if (cur == &str[0][0]) {
cur = &str[1][0];
- } else if (cur == &str[1][0]) {
+ } else if (cur == &str[1][0]) {
cur = &str[2][0];
- } else {
+ } else {
cur = &str[0][0];
}
-
+
node=ad[1]<<8|ad[2];
sprintf(cur, "%d.%d",node,ad[3]);
return cur;
}
-
-void
-dissect_aarp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
- e_ether_aarp ea;
- proto_tree *aarp_tree;
- proto_item *ti;
- gchar *op_str;
- value_string op_vals[] = { {AARP_REQUEST, "AARP request" },
- {AARP_REPLY, "AARP reply" },
- {AARP_PROBE, "AARP probe" },
- {0, NULL } };
-
- if (!BYTES_ARE_IN_FRAME(offset, sizeof(e_ether_aarp))) {
- dissect_data(pd, offset, fd, tree);
- return;
- }
- ea.htype = pntohs(&pd[offset]);
- ea.ptype = pntohs(&pd[offset + 2]);
- ea.halen = (guint8) pd[offset + 4];
- ea.palen = (guint8) pd[offset + 5];
- ea.op = pntohs(&pd[offset + 6]);
- memcpy(&ea.hsaddr, &pd[offset + 8], 6);
- memcpy(&ea.psaddr, &pd[offset + 14], 4);
- memcpy(&ea.hdaddr, &pd[offset + 18], 6);
- memcpy(&ea.pdaddr, &pd[offset + 24], 4);
-
- if(check_col(fd, COL_PROTOCOL))
- col_add_str(fd, COL_PROTOCOL, "AARP");
-
- if (tree) {
- if ((op_str = match_strval(ea.op, op_vals)))
- ti = proto_tree_add_item_format(tree, proto_aarp, offset, 28, NULL, op_str);
- else
- ti = proto_tree_add_item_format(tree, proto_aarp, offset, 28, NULL,
- "Unknown AARP (opcode 0x%04x)", ea.op);
- aarp_tree = proto_item_add_subtree(ti, ETT_AARP);
- proto_tree_add_item_format(aarp_tree, hf_aarp_hard_type, offset, 2,
- ea.htype,
- "Hardware type: 0x%04x",
- ea.htype);
- proto_tree_add_item_format(aarp_tree, hf_aarp_proto_type, offset + 2, 2,
- ea.ptype,
- "Protocol type: 0x%04x",
- ea.ptype);
- proto_tree_add_item_format(aarp_tree, hf_aarp_hard_size, offset + 4, 1,
- ea.halen,
- "Hardware size: 0x%02x",
- ea.halen);
- proto_tree_add_item_format(aarp_tree, hf_aarp_proto_size, offset + 5, 1,
- ea.palen,
- "Protocol size: 0x%02x",
- ea.palen);
- proto_tree_add_item_format(aarp_tree, hf_aarp_opcode, offset + 6, 2,
- ea.op,
- "Opcode: 0x%04x (%s)",
- ea.op, op_str ? op_str : "Unknown");
- proto_tree_add_item(aarp_tree, hf_aarp_src_ether, offset + 8, 6,
- ea.hsaddr);
- proto_tree_add_item_format(aarp_tree, hf_aarp_src_id, offset + 14, 4,
- ea.psaddr,
- "Sender ID: %s",
- atalkid_to_str((guint8 *) ea.psaddr));
- proto_tree_add_item(aarp_tree, hf_aarp_dst_ether, offset + 18, 6,
- ea.hdaddr);
- proto_tree_add_item_format(aarp_tree, hf_aarp_dst_id, offset + 24, 4,
- ea.pdaddr,
- "Target ID: %s",
- atalkid_to_str((guint8 *) ea.pdaddr));
+static gchar *
+aarphrdaddr_to_str(const guint8 *ad, int ad_len, guint16 type) {
+ if (AARP_HW_IS_ETHER(type, ad_len)) {
+ /* Ethernet address (or Token Ring address, which is the same type
+ of address). */
+ return ether_to_str(ad);
}
+ return bytes_to_str(ad, ad_len);
+}
- if (ea.ptype != ETHERTYPE_AARP && ea.ptype != ETHERTYPE_ATALK &&
- check_col(fd, COL_INFO)) {
- col_add_fstr(fd, COL_INFO, "h/w %d (%d) prot %d (%d) op 0x%04x",
- ea.htype, ea.halen, ea.ptype, ea.palen, ea.op);
- return;
+static gchar *
+aarpproaddr_to_str(const guint8 *ad, int ad_len, guint16 type) {
+ if (AARP_PRO_IS_ATALK(type, ad_len)) {
+ /* Appletalk address. */
+ return atalkid_to_str(ad);
}
- if (check_col(fd, COL_INFO)) {
- switch (ea.op) {
+ return bytes_to_str(ad, ad_len);
+}
+
+/* Offsets of fields within an AARP packet. */
+#define AR_HRD 0
+#define AR_PRO 2
+#define AR_HLN 4
+#define AR_PLN 5
+#define AR_OP 6
+#define MIN_AARP_HEADER_SIZE 8
+
+static void
+dissect_aarp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) {
+ guint16 ar_hrd;
+ guint16 ar_pro;
+ guint8 ar_hln;
+ guint8 ar_pln;
+ guint16 ar_op;
+ proto_tree *aarp_tree;
+ proto_item *ti;
+ gchar *op_str;
+ int sha_offset, spa_offset, tha_offset, tpa_offset;
+ const guint8 *sha_val, *spa_val, *tha_val, *tpa_val;
+ gchar *sha_str, *spa_str, *tha_str, *tpa_str;
+
+ if(check_col(pinfo->cinfo, COL_PROTOCOL))
+ col_set_str(pinfo->cinfo, COL_PROTOCOL, "AARP");
+ if(check_col(pinfo->cinfo, COL_INFO))
+ col_clear(pinfo->cinfo, COL_INFO);
+
+ ar_hrd = tvb_get_ntohs(tvb, AR_HRD);
+ ar_pro = tvb_get_ntohs(tvb, AR_PRO);
+ ar_hln = tvb_get_guint8(tvb, AR_HLN);
+ ar_pln = tvb_get_guint8(tvb, AR_PLN);
+ ar_op = tvb_get_ntohs(tvb, AR_OP);
+
+ /* Get the offsets of the addresses. */
+ sha_offset = MIN_AARP_HEADER_SIZE;
+ spa_offset = sha_offset + ar_hln;
+ tha_offset = spa_offset + ar_pln;
+ tpa_offset = tha_offset + ar_hln;
+
+ /* Extract the addresses. */
+ sha_val = tvb_get_ptr(tvb, sha_offset, ar_hln);
+ sha_str = aarphrdaddr_to_str(sha_val, ar_hln, ar_hrd);
+
+ spa_val = tvb_get_ptr(tvb, spa_offset, ar_pln);
+ spa_str = aarpproaddr_to_str(spa_val, ar_pln, ar_pro);
+
+ tha_val = tvb_get_ptr(tvb, tha_offset, ar_hln);
+ tha_str = aarphrdaddr_to_str(tha_val, ar_hln, ar_hrd);
+
+ tpa_val = tvb_get_ptr(tvb, tpa_offset, ar_pln);
+ tpa_str = aarpproaddr_to_str(tpa_val, ar_pln, ar_pro);
+
+ if (check_col(pinfo->cinfo, COL_INFO)) {
+ switch (ar_op) {
case AARP_REQUEST:
- col_add_fstr(fd, COL_INFO, "Who has %s? Tell %s",
- atalkid_to_str((guint8 *) ea.pdaddr), atalkid_to_str((guint8 *) ea.psaddr));
+ case AARP_REQUEST_SWAPPED:
+ col_add_fstr(pinfo->cinfo, COL_INFO, "Who has %s? Tell %s", tpa_str, spa_str);
break;
case AARP_REPLY:
- col_add_fstr(fd, COL_INFO, "%s is at %s",
- atalkid_to_str((guint8 *) ea.psaddr),
- ether_to_str((guint8 *) ea.hsaddr));
+ case AARP_REPLY_SWAPPED:
+ col_add_fstr(pinfo->cinfo, COL_INFO, "%s is at %s", spa_str, sha_str);
break;
case AARP_PROBE:
- col_add_fstr(fd, COL_INFO, "Is there a %s",
- atalkid_to_str((guint8 *) ea.pdaddr));
+ case AARP_PROBE_SWAPPED:
+ col_add_fstr(pinfo->cinfo, COL_INFO, "Is there a %s", tpa_str);
+ break;
+ default:
+ col_add_fstr(pinfo->cinfo, COL_INFO, "Unknown AARP opcode 0x%04x", ar_op);
break;
}
}
+
+ if (tree) {
+ if ((op_str = match_strval(ar_op, op_vals)))
+ ti = proto_tree_add_protocol_format(tree, proto_aarp, tvb, 0,
+ MIN_AARP_HEADER_SIZE + 2*ar_hln +
+ 2*ar_pln, "AppleTalk Address Resolution Protocol (%s)", op_str);
+ else
+ ti = proto_tree_add_protocol_format(tree, proto_aarp, tvb, 0,
+ MIN_AARP_HEADER_SIZE + 2*ar_hln +
+ 2*ar_pln,
+ "AppleTalk Address Resolution Protocol (opcode 0x%04x)", ar_op);
+ aarp_tree = proto_item_add_subtree(ti, ett_aarp);
+ proto_tree_add_uint(aarp_tree, hf_aarp_hard_type, tvb, AR_HRD, 2,
+ ar_hrd);
+ proto_tree_add_uint(aarp_tree, hf_aarp_proto_type, tvb, AR_PRO, 2,
+ ar_pro);
+ proto_tree_add_uint(aarp_tree, hf_aarp_hard_size, tvb, AR_HLN, 1,
+ ar_hln);
+ proto_tree_add_uint(aarp_tree, hf_aarp_proto_size, tvb, AR_PLN, 1,
+ ar_pln);
+ proto_tree_add_uint(aarp_tree, hf_aarp_opcode, tvb, AR_OP, 2,
+ ar_op);
+ if (ar_hln != 0) {
+ proto_tree_add_item(aarp_tree,
+ AARP_HW_IS_ETHER(ar_hrd, ar_hln) ? hf_aarp_src_hw_mac : hf_aarp_src_hw,
+ tvb, sha_offset, ar_hln, FALSE);
+ }
+
+ if (ar_pln != 0) {
+ if (AARP_PRO_IS_ATALK(ar_pro, ar_pln)) {
+ proto_tree_add_bytes_format(aarp_tree, hf_aarp_src_proto_id, tvb, spa_offset, ar_pln,
+ spa_val,
+ "Sender ID: %s", spa_str);
+ } else {
+ proto_tree_add_bytes_format(aarp_tree, hf_aarp_src_proto, tvb, spa_offset, ar_pln,
+ spa_val,
+ "Sender protocol address: %s", spa_str);
+ }
+ }
+
+ if (ar_hln != 0) {
+ proto_tree_add_item(aarp_tree,
+ AARP_HW_IS_ETHER(ar_hrd, ar_hln) ? hf_aarp_dst_hw_mac : hf_aarp_dst_hw,
+ tvb, tha_offset, ar_hln, FALSE);
+ }
+
+ if (ar_pln != 0) {
+ if (AARP_PRO_IS_ATALK(ar_pro, ar_pln)) {
+ proto_tree_add_bytes_format(aarp_tree, hf_aarp_dst_proto_id, tvb, tpa_offset, ar_pln,
+ tpa_val,
+ "Target ID: %s", tpa_str);
+ } else {
+ proto_tree_add_bytes_format(aarp_tree, hf_aarp_dst_proto, tvb, tpa_offset, ar_pln,
+ tpa_val,
+ "Target protocol address: %s", tpa_str);
+ }
+ }
+ }
}
void
{
static hf_register_info hf[] = {
{ &hf_aarp_hard_type,
- { "Hardware type", "aarp.hard.type", FT_UINT16, BASE_HEX, NULL, 0x0,
- "" }},
+ { "Hardware type", "aarp.hard.type",
+ FT_UINT16, BASE_HEX, VALS(hrd_vals), 0x0,
+ "", HFILL }},
{ &hf_aarp_proto_type,
- { "Protocol type", "aarp.proto.type", FT_UINT16, BASE_HEX, NULL, 0x0,
- "" }},
+ { "Protocol type", "aarp.proto.type",
+ FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0,
+ "", HFILL }},
{ &hf_aarp_hard_size,
- { "Hardware size", "aarp.hard.size", FT_UINT8, BASE_DEC, NULL, 0x0,
- "" }},
+ { "Hardware size", "aarp.hard.size",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
{ &hf_aarp_proto_size,
- { "Protocol size", "aarp.proto.size", FT_UINT8, BASE_DEC, NULL, 0x0,
- "" }},
+ { "Protocol size", "aarp.proto.size",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
{ &hf_aarp_opcode,
- { "Opcode", "aarp.opcode", FT_UINT16, BASE_DEC, NULL, 0x0,
- "" }},
+ { "Opcode", "aarp.opcode",
+ FT_UINT16, BASE_DEC, VALS(op_vals), 0x0,
+ "", HFILL }},
+
+ { &hf_aarp_src_hw,
+ { "Sender hardware address", "aarp.src.hw",
+ FT_BYTES, BASE_NONE, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_aarp_src_hw_mac,
+ { "Sender MAC address", "aarp.src.hw_mac",
+ FT_ETHER, BASE_NONE, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_aarp_src_proto,
+ { "Sender protocol address", "aarp.src.proto",
+ FT_BYTES, BASE_NONE, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_aarp_src_proto_id,
+ { "Sender ID", "aarp.src.proto_id",
+ FT_BYTES, BASE_HEX, NULL, 0x0,
+ "", HFILL }},
- { &hf_aarp_src_ether,
- { "Sender ether", "aarp.src.ether", FT_ETHER, BASE_NONE, NULL, 0x0,
- "" }},
+ { &hf_aarp_dst_hw,
+ { "Target hardware address", "aarp.dst.hw",
+ FT_BYTES, BASE_NONE, NULL, 0x0,
+ "", HFILL }},
- { &hf_aarp_src_id,
- { "Sender ID", "aarp.src.id", FT_UINT32, BASE_HEX, NULL, 0x0,
- "" }},
+ { &hf_aarp_dst_hw_mac,
+ { "Target MAC address", "aarp.dst.hw_mac",
+ FT_ETHER, BASE_NONE, NULL, 0x0,
+ "", HFILL }},
- { &hf_aarp_dst_ether,
- { "Target ether", "aarp.dst.ether", FT_ETHER, BASE_NONE, NULL, 0x0,
- "" }},
+ { &hf_aarp_dst_proto,
+ { "Target protocol address", "aarp.dst.proto",
+ FT_BYTES, BASE_NONE, NULL, 0x0,
+ "", HFILL }},
- { &hf_aarp_dst_id,
- { "Target ID", "aarp.dst.id", FT_UINT32, BASE_HEX, NULL, 0x0,
- "" }},
+ { &hf_aarp_dst_proto_id,
+ { "Target ID", "aarp.dst.proto_id",
+ FT_BYTES, BASE_HEX, NULL, 0x0,
+ "", HFILL }},
+ };
+ static gint *ett[] = {
+ &ett_aarp,
};
proto_aarp = proto_register_protocol("Appletalk Address Resolution Protocol",
+ "AARP",
"aarp");
proto_register_field_array(proto_aarp, hf, array_length(hf));
+ proto_register_subtree_array(ett, array_length(ett));
+}
+
+void
+proto_reg_handoff_aarp(void)
+{
+ dissector_handle_t aarp_handle;
+
+ aarp_handle = create_dissector_handle(dissect_aarp, proto_aarp);
+ dissector_add("ethertype", ETHERTYPE_AARP, aarp_handle);
+ dissector_add("chdlctype", ETHERTYPE_AARP, aarp_handle);
}
git.samba.org / obnox / wireshark / wip.git / blobdiff