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/* packet-aarp.c
* Routines for Appletalk ARP packet disassembly
*
* Simon Wilkinson <sxw@dcs.ed.ac.uk>
*
* 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 <stdio.h>
#include <glib.h>
#include "packet.h"
#include "etypes.h"
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;
#ifndef AARP_REQUEST
#define AARP_REQUEST 0x0001
#endif
#ifndef AARP_REPLY
#define AARP_REPLY 0x0002
#endif
#ifndef AARP_PROBE
#define AARP_PROBE 0x0003
#endif
gchar *
atalkid_to_str(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]) {
cur = &str[2][0];
} 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 } };
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_text(tree, offset, 28, op_str);
else
ti = proto_tree_add_text(tree, offset, 28,
"Unknown AARP (opcode 0x%04x)", ea.op);
aarp_tree = proto_item_add_subtree(ti, ETT_AARP);
proto_tree_add_text(aarp_tree, offset, 2,
"Hardware type: 0x%04x", ea.htype);
proto_tree_add_text(aarp_tree, offset + 2, 2,
"Protocol type: 0x%04x", ea.ptype);
proto_tree_add_text(aarp_tree, offset + 4, 1,
"Hardware size: 0x%02x", ea.halen);
proto_tree_add_text(aarp_tree, offset + 5, 1,
"Protocol size: 0x%02x", ea.palen);
proto_tree_add_text(aarp_tree, offset + 6, 2,
"Opcode: 0x%04x (%s)", ea.op, op_str ? op_str : "Unknown");
proto_tree_add_text(aarp_tree, offset + 8, 6,
"Sender ether: %s", ether_to_str((guint8 *) ea.hsaddr));
proto_tree_add_text(aarp_tree, offset + 14, 4,
"Sender ID: %s", atalkid_to_str((guint8 *) ea.psaddr));
proto_tree_add_text(aarp_tree, offset + 18, 6,
"Target ether: %s", ether_to_str((guint8 *) ea.hdaddr));
proto_tree_add_text(aarp_tree, offset + 24, 4,
"Target ID: %s", atalkid_to_str((guint8 *) ea.pdaddr));
}
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;
}
if (check_col(fd, COL_INFO)) {
switch (ea.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));
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));
break;
case AARP_PROBE:
col_add_fstr(fd, COL_INFO, "Is there a %s",
atalkid_to_str((guint8 *) ea.pdaddr));
break;
}
}
}
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