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wireshark/packet-iapp.c

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/* packet-iapp.c
* Routines for IAPP dissection
* Copyright 2002, Alfred Arnold <aarnold@elsa.de>
*
* $Id: packet-iapp.c,v 1.6 2002/08/28 21:00:16 jmayer Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1998 Gerald Combs
*
* is a dissector file; if you just copied this from README.developer,
* don't bother with the "Copied from" - you don't even need to put
* in a "Copied from" if you copied an existing dissector, especially
* if the bulk of the code in the new dissector is your code)
*
* 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
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <glib.h>
#include <epan/packet.h>
#include "oui.h"
/* Initialize the protocol and registered fields */
static int proto_iapp = -1;
static int hf_iapp_version = -1;
static int hf_iapp_type = -1;
/* Initialize the subtree pointers */
static gint ett_iapp = -1;
static gint ett_iapp_pdu = -1;
static gint ett_iapp_cap = -1;
static gint ett_iapp_auth = -1;
#define UDP_PORT_IAPP 2313
#define IAPP_ANNOUNCE_REQUEST 0
#define IAPP_ANNOUNCE_RESPONSE 1
#define IAPP_HANDOVER_REQUEST 2
#define IAPP_HANDOVER_RESPONSE 3
#define IAPP_PDU_SSID 0
#define IAPP_PDU_BSSID 1
#define IAPP_PDU_OLDBSSID 2
#define IAPP_PDU_MSADDR 3
#define IAPP_PDU_CAPABILITY 4
#define IAPP_PDU_ANNOUNCEINT 5
#define IAPP_PDU_HOTIMEOUT 6
#define IAPP_PDU_MESSAGEID 7
#define IAPP_PDU_PHYTYPE 0x10
#define IAPP_PDU_REGDOMAIN 0x11
#define IAPP_PDU_CHANNEL 0x12
#define IAPP_PDU_BEACONINT 0x13
#define IAPP_PDU_OUIIDENT 0x80
#define IAPP_PDU_AUTHINFO 0x81
#define IAPP_CAP_FORWARDING 0x40
#define IAPP_CAP_WEP 0x20
#define IAPP_PHY_PROP 0x00
#define IAPP_PHY_FHSS 0x01
#define IAPP_PHY_DSSS 0x02
#define IAPP_PHY_IR 0x03
#define IAPP_PHY_OFDM 0x04
#define IAPP_DOM_FCC 0x10
#define IAPP_DOM_IC 0x20
#define IAPP_DOM_ETSI 0x30
#define IAPP_DOM_SPAIN 0x31
#define IAPP_DOM_FRANCE 0x32
#define IAPP_DOM_MKK 0x40
#define IAPP_AUTH_STATUS 0x01
#define IAPP_AUTH_USERNAME 0x02
#define IAPP_AUTH_PROVNAME 0x03
#define IAPP_AUTH_RXPKTS 0x04
#define IAPP_AUTH_TXPKTS 0x05
#define IAPP_AUTH_RXBYTES 0x06
#define IAPP_AUTH_TXBYTES 0x07
#define IAPP_AUTH_LOGINTIME 0x08
#define IAPP_AUTH_TIMELIMIT 0x09
#define IAPP_AUTH_VOLLIMIT 0x0a
#define IAPP_AUTH_ACCCYCLE 0x0b
#define IAPP_AUTH_RXGWORDS 0x0c
#define IAPP_AUTH_TXGWORDS 0x0d
#define IAPP_AUTH_IPADDR 0x0e
#define IAPP_AUTH_TRAILER 0xff
typedef struct _e_iapphdr {
guint8 ia_version;
guint8 ia_type;
} e_iapphdr;
typedef struct _e_pduhdr {
guint8 pdu_type;
guint8 pdu_len_h;
guint8 pdu_len_l;
} e_pduhdr;
static value_string iapp_vals[] = {
{IAPP_ANNOUNCE_REQUEST, "Announce Request"},
{IAPP_ANNOUNCE_RESPONSE, "Announce Response"},
{IAPP_HANDOVER_REQUEST, "Handover Request"},
{IAPP_HANDOVER_RESPONSE, "Handover Response"},
{0, NULL}};
static value_string iapp_pdu_type_vals[] = {
{IAPP_PDU_SSID, "Network Name"},
{IAPP_PDU_BSSID, "BSSID"},
{IAPP_PDU_OLDBSSID, "Old BSSID"},
{IAPP_PDU_MSADDR, "Mobile Station Address"},
{IAPP_PDU_CAPABILITY, "Capabilities"},
{IAPP_PDU_ANNOUNCEINT, "Announce Interval"},
{IAPP_PDU_HOTIMEOUT, "Handover Timeout"},
{IAPP_PDU_MESSAGEID, "Message ID"},
{IAPP_PDU_PHYTYPE, "PHY Type"},
{IAPP_PDU_REGDOMAIN, "Regulatory Domain"},
{IAPP_PDU_CHANNEL, "Radio Channel"},
{IAPP_PDU_BEACONINT, "Beacon Interval"},
{IAPP_PDU_OUIIDENT, "OUI Identifier"},
{IAPP_PDU_AUTHINFO, "ELSA Authentication Info"},
{0, NULL}};
static value_string iapp_cap_vals[] = {
{IAPP_CAP_FORWARDING, "Forwarding"},
{IAPP_CAP_WEP, "WEP"},
{0, NULL}};
static value_string iapp_phy_vals[] = {
{IAPP_PHY_PROP, "Proprietary"},
{IAPP_PHY_FHSS, "FHSS"},
{IAPP_PHY_DSSS, "DSSS"},
{IAPP_PHY_IR, "Infrared"},
{IAPP_PHY_OFDM, "OFDM"},
{0, NULL}};
static value_string iapp_dom_vals[] = {
{IAPP_DOM_FCC, "FCC (USA)"},
{IAPP_DOM_IC, "IC (Canada)"},
{IAPP_DOM_ETSI, "ETSI (Europe)"},
{IAPP_DOM_SPAIN, "Spain"},
{IAPP_DOM_FRANCE, "France"},
{IAPP_DOM_MKK, "MKK (Japan)"},
{0, NULL}};
static value_string iapp_auth_type_vals[] = {
{IAPP_AUTH_STATUS, "Status"},
{IAPP_AUTH_USERNAME, "User Name"},
{IAPP_AUTH_PROVNAME, "Provider Name"},
{IAPP_AUTH_RXPKTS, "Received Packets"},
{IAPP_AUTH_TXPKTS, "Transmitted Packets"},
{IAPP_AUTH_RXBYTES, "Received Octets"},
{IAPP_AUTH_TXBYTES, "Transmitted Octets"},
{IAPP_AUTH_LOGINTIME, "Session Time"},
{IAPP_AUTH_TIMELIMIT, "Time Limit"},
{IAPP_AUTH_VOLLIMIT, "Volume Limit"},
{IAPP_AUTH_ACCCYCLE, "Accounting Cycle"},
{IAPP_AUTH_TRAILER, "Authenticator"},
{IAPP_AUTH_RXGWORDS, "Received Gigawords"},
{IAPP_AUTH_TXGWORDS, "Transmitted Gigawords"},
{IAPP_AUTH_IPADDR, "Client IP Address"},
{0, NULL}};
static gchar textbuffer[2000];
static gchar*
iaconvertbufftostr(gchar *dest, tvbuff_t *tvb, int offset, int length)
{
/*converts the raw buffer into printable text */
guint32 i;
guint32 totlen=0;
const guint8 *pd = tvb_get_ptr(tvb, offset, length);
dest[0]='"';
dest[1]=0;
totlen=1;
for (i=0; i < (guint32)length; i++)
{
if( isalnum((int)pd[i])||ispunct((int)pd[i])
||((int)pd[i]==' ')) {
dest[totlen]=(gchar)pd[i];
totlen++;
}
else
{
sprintf(&(dest[totlen]), "\\%03o", pd[i]);
totlen=totlen+strlen(&(dest[totlen]));
}
}
dest[totlen]='"';
dest[totlen+1]=0;
return dest;
}
/* dissect a capability bit field */
static void dissect_caps(proto_item *pitem, tvbuff_t *tvb, int offset)
{
proto_tree *captree;
int bit, val, z, thisbit;
gchar *strval, bitval[20];
captree = proto_item_add_subtree(pitem, ett_iapp_cap);
val = tvb_get_guint8(tvb, offset + 3);
bitval[8] = '\0';
for (bit = 7; bit >= 0; bit--)
{
strval = match_strval(1 << bit, iapp_cap_vals);
if (strval)
{
thisbit = (val & (1 << bit)) ? 1 : 0;
for (z = 0; z < 7; z++)
if (z == 7 - bit)
bitval[z] = thisbit + '0';
else
bitval[z] = '.';
proto_tree_add_text(captree, tvb, offset + 3, 1, "%s %s: %s",
bitval, strval, thisbit ? "Yes" : "No");
}
}
}
static gchar*
authval_to_str(int type, int len, tvbuff_t *tvb, int offset)
{
gchar *run;
int z, val;
run = textbuffer;
run += sprintf(run, "Value: ");
switch (type)
{
case IAPP_AUTH_STATUS:
strcpy(textbuffer, tvb_get_guint8(tvb, offset + 3) ? "Authenticated" : "Not authenticated");
break;
case IAPP_AUTH_USERNAME:
case IAPP_AUTH_PROVNAME:
iaconvertbufftostr(run, tvb, offset + 3, len);
break;
case IAPP_AUTH_RXPKTS:
case IAPP_AUTH_TXPKTS:
case IAPP_AUTH_RXBYTES:
case IAPP_AUTH_TXBYTES:
case IAPP_AUTH_RXGWORDS:
case IAPP_AUTH_TXGWORDS:
case IAPP_AUTH_VOLLIMIT:
val = tvb_get_ntohl(tvb, offset + 3);
run += sprintf(run, "%d", val);
break;
case IAPP_AUTH_LOGINTIME:
case IAPP_AUTH_TIMELIMIT:
case IAPP_AUTH_ACCCYCLE:
val = tvb_get_ntohl(tvb, offset + 3);
run += sprintf(run, "%d seconds", val);
break;
case IAPP_AUTH_IPADDR:
run += sprintf(run, "%d.%d.%d.%d",
tvb_get_guint8(tvb, offset + 3),
tvb_get_guint8(tvb, offset + 4),
tvb_get_guint8(tvb, offset + 5),
tvb_get_guint8(tvb, offset + 6));
break;
case IAPP_AUTH_TRAILER:
for (z = 0; z < len; z++)
run += sprintf(run, " %02x", tvb_get_guint8(tvb, offset + 3 + z));
break;
}
return textbuffer;
}
/* dissect authentication info */
static void dissect_authinfo(proto_item *pitem, tvbuff_t *tvb, int offset, int sumlen)
{
proto_tree *authtree;
e_pduhdr pduhdr;
gchar *authstrval, *valstr;
int len;
authtree = proto_item_add_subtree(pitem, ett_iapp_auth);
while (sumlen > 0)
{
tvb_memcpy(tvb, (guint8 *)&pduhdr, offset, sizeof(e_pduhdr));
len = (((int)pduhdr.pdu_len_h) << 8) + pduhdr.pdu_len_l;
authstrval = val_to_str(pduhdr.pdu_type, iapp_auth_type_vals,
"Unknown PDU Type");
valstr = authval_to_str(pduhdr.pdu_type, len, tvb, offset);
proto_tree_add_text(authtree, tvb, offset, len + 3, "%s(%d) %s",
authstrval, pduhdr.pdu_type, valstr);
sumlen -= (len + 3);
offset += (len + 3);
}
}
/* get displayable values of PDU contents */
static int is_fhss = 0;
static gchar*
pduval_to_str(int type, int len, tvbuff_t *tvb, int offset)
{
gchar *run;
const guint8 *mac;
int z, val;
gchar *strval;
run = textbuffer;
run += sprintf(run, "Value: ");
switch (type)
{
case IAPP_PDU_SSID:
iaconvertbufftostr(run, tvb, offset + 3, len);
break;
case IAPP_PDU_BSSID:
case IAPP_PDU_OLDBSSID:
case IAPP_PDU_MSADDR:
mac = tvb_get_ptr(tvb, offset + 3, len);
for (z = 0; z < len; z++)
run += sprintf(run, "%s%02x", z ? ":" : "", mac[z]);
break;
case IAPP_PDU_CAPABILITY:
{
int mask, first = 1;
val = tvb_get_guint8(tvb, offset + 3);
run += sprintf(run, "%02x (", val);
for (mask = 0x80; mask; mask >>= 1)
if (val & mask)
{
strval = match_strval(mask, iapp_cap_vals);
if (strval)
{
if (!first)
run += sprintf(run, " ");
run += sprintf(run, strval);
}
}
run += sprintf(run, ")");
break;
}
case IAPP_PDU_ANNOUNCEINT:
val = tvb_get_ntohs(tvb, offset + 3);
run += sprintf(run, "%d seconds", val);
break;
case IAPP_PDU_HOTIMEOUT:
case IAPP_PDU_BEACONINT:
val = tvb_get_ntohs(tvb, offset + 3);
run += sprintf(run, "%d Kus", val);
break;
case IAPP_PDU_MESSAGEID:
val = tvb_get_ntohs(tvb, offset + 3);
run += sprintf(run, "%d", val);
break;
case IAPP_PDU_PHYTYPE:
val = tvb_get_guint8(tvb, offset + 3);
strval = val_to_str(val, iapp_phy_vals, "Unknown");
run += sprintf(run, strval);
is_fhss = (val == IAPP_PHY_FHSS);
break;
case IAPP_PDU_REGDOMAIN:
val = tvb_get_guint8(tvb, offset + 3);
strval = val_to_str(val, iapp_dom_vals, "Unknown");
run += sprintf(run, strval);
break;
case IAPP_PDU_CHANNEL:
val = tvb_get_guint8(tvb, offset + 3);
if (is_fhss)
run += sprintf(run, "Pattern set %d, sequence %d",
((val >> 6) & 3) + 1, (val & 31) + 1);
else
run += sprintf(run, "%d", val);
break;
case IAPP_PDU_OUIIDENT:
for (val = z = 0; z < 3; z++)
val = (val << 8) | tvb_get_guint8(tvb, offset + 3 + z);
strval = val_to_str(val, oui_vals, "Unknown");
run += sprintf(run, strval);
break;
}
return textbuffer;
}
/* code to dissect a list of PDUs */
static void
dissect_pdus(tvbuff_t *tvb, int offset, proto_tree *pdutree, int pdulen)
{
e_pduhdr pduhdr;
int len;
gchar *pdustrval, *valstr;
proto_item *ti;
if (!pdulen)
{
proto_tree_add_text(pdutree, tvb, offset, 0, "No PDUs found");
return;
}
while (pdulen > 0)
{
tvb_memcpy(tvb, (guint8 *)&pduhdr, offset, sizeof(e_pduhdr));
len = (((int)pduhdr.pdu_len_h) << 8) + pduhdr.pdu_len_l;
pdustrval = val_to_str(pduhdr.pdu_type, iapp_pdu_type_vals,
"Unknown PDU Type");
valstr = pduval_to_str(pduhdr.pdu_type, len, tvb, offset);
ti = proto_tree_add_text(pdutree, tvb, offset, len + 3, "%s(%d) %s",
pdustrval, pduhdr.pdu_type, valstr);
if (pduhdr.pdu_type == IAPP_PDU_CAPABILITY)
dissect_caps(ti, tvb, offset);
if (pduhdr.pdu_type == IAPP_PDU_AUTHINFO)
dissect_authinfo(ti, tvb, offset + 3, len);
pdulen -= (len + 3);
offset += (len + 3);
}
}
/* code to dissect an IAPP packet */
static void
dissect_iapp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *ti, *pdutf;
proto_tree *iapp_tree, *pdutree;
e_iapphdr ih;
int ia_version;
int ia_type;
gchar *codestrval;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "IAPP");
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
tvb_memcpy(tvb, (guint8 *)&ih, 0, sizeof(e_iapphdr));
ia_version = (int)ih.ia_version;
ia_type = (int)ih.ia_type;
codestrval = val_to_str(ia_type, iapp_vals, "Unknown Packet");
if (check_col(pinfo->cinfo, COL_INFO))
{
col_add_fstr(pinfo->cinfo, COL_INFO, "%s(%d) (version=%d)",
codestrval, ia_type, ia_version);
}
if (tree)
{
ti = proto_tree_add_item(tree, proto_iapp, tvb, 0, -1, FALSE);
iapp_tree = proto_item_add_subtree(ti, ett_iapp);
/* common header for all IAPP frames */
proto_tree_add_uint(iapp_tree, hf_iapp_version, tvb, 0, 1,
ih.ia_version);
proto_tree_add_uint_format(iapp_tree, hf_iapp_type, tvb, 1, 1,
ih.ia_type, "Type: %s(%d)", codestrval, ia_type);
pdutf = proto_tree_add_text(iapp_tree, tvb, 2, -1,
"Protocol data units");
pdutree = proto_item_add_subtree(pdutf, ett_iapp_pdu);
if (pdutree)
{
dissect_pdus(tvb, 2, pdutree,
tvb_length_remaining(tvb, 2));
}
}
}
/* Register the protocol with Ethereal */
/* this format is require because a script is used to build the C function
that calls all the protocol registration.
*/
void
proto_register_iapp(void)
{
/* Setup list of header fields See Section 1.6.1 for details*/
static hf_register_info hf[] = {
{ &hf_iapp_version,
{ "Version", "iapp.version", FT_UINT8, BASE_DEC, NULL, 0x00, "", HFILL }
},
{ &hf_iapp_type,
{ "type", "iapp.type", FT_UINT8, BASE_DEC, NULL, 0x00, "", HFILL }
},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_iapp,
&ett_iapp_pdu,
&ett_iapp_cap,
&ett_iapp_auth
};
/* Register the protocol name and description */
proto_iapp = proto_register_protocol("Inter-Access-Point Protocol",
"IAPP", "iapp");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_iapp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
/* If this dissector uses sub-dissector registration add a registration routine.
This format is required because a script is used to find these routines and
create the code that calls these routines.
*/
void
proto_reg_handoff_iapp(void)
{
dissector_handle_t iapp_handle;
iapp_handle = create_dissector_handle(dissect_iapp, proto_iapp);
dissector_add("udp.port", UDP_PORT_IAPP, iapp_handle);
}
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