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wireshark/epan/dissectors/packet-iapp.c
Guy Harris ab797734dd Get rid of the private "my_match_strval()" routine in many dissectors; 
add a "match_strval_idx()" routine that does the same thing, and have
"match_strval()" call it.

Make those routines, and "val_to_str()", return a "const" pointer. 
Update dissectors as necessary to squelch compiler warnings produced by
that.

Use "val_to_str()" rather than using "match_strval()" and then, if the
result is null, substituting a specific string.  Clean up some other
"match_strval()"/"val_to_str()" usages.

Add a null pointer check in the NDPS dissector's "attribute_value()"
routine, as it's not clear that "global_attribute_name" won't be null at
that point.

Make some global variables in the AFS4INT dissector local.

Make some routines not used outside the module they're in static.

Make some tables "static const".

Clean up white space.

Fix Gerald's address in some files.

svn path=/trunk/; revision=14786
2005-06-26 19:56:52 +00:00

516 lines
14 KiB
C
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/* packet-iapp.c
* Routines for IAPP dissection
* Copyright 2002, Alfred Arnold <aarnold@elsa.de>
*
* $Id$
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* 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
#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}};
/* 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;
const gchar *strval;
gchar 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 void
append_authval_str(proto_item *ti, int type, int len, tvbuff_t *tvb, int offset)
{
int z, val;
proto_item_append_text(ti, " Value: ");
switch (type)
{
case IAPP_AUTH_STATUS:
proto_item_append_text(ti, "%s", tvb_get_guint8(tvb, offset + 3) ? "Authenticated" : "Not authenticated");
break;
case IAPP_AUTH_USERNAME:
case IAPP_AUTH_PROVNAME:
proto_item_append_text(ti, "\"%s\"",
tvb_format_text(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);
proto_item_append_text(ti, "%d", val);
break;
case IAPP_AUTH_LOGINTIME:
case IAPP_AUTH_TIMELIMIT:
case IAPP_AUTH_ACCCYCLE:
val = tvb_get_ntohl(tvb, offset + 3);
proto_item_append_text(ti, "%d seconds", val);
break;
case IAPP_AUTH_IPADDR:
proto_item_append_text(ti, "%s",
ip_to_str(tvb_get_ptr(tvb, offset + 3, 4)));
break;
case IAPP_AUTH_TRAILER:
for (z = 0; z < len; z++)
proto_item_append_text(ti, "%s%02x", z ? " " : "",
tvb_get_guint8(tvb, offset + 3 + z));
break;
}
}
/* dissect authentication info */
static void dissect_authinfo(proto_item *pitem, tvbuff_t *tvb, int offset, int sumlen)
{
proto_tree *authtree;
proto_item *ti;
e_pduhdr pduhdr;
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;
ti = proto_tree_add_text(authtree, tvb, offset, len + 3,
"%s(%d)",
val_to_str(pduhdr.pdu_type, iapp_auth_type_vals,
"Unknown PDU Type"),
pduhdr.pdu_type);
append_authval_str(ti, pduhdr.pdu_type, len, tvb, offset);
sumlen -= (len + 3);
offset += (len + 3);
}
}
/* get displayable values of PDU contents */
static gboolean
append_pduval_str(proto_item *ti, int type, int len, tvbuff_t *tvb, int offset,
gboolean is_fhss)
{
const guint8 *mac;
int z, val;
const gchar *strval;
proto_item_append_text(ti, " Value: ");
switch (type)
{
case IAPP_PDU_SSID:
proto_item_append_text(ti, "\"%s\"",
tvb_format_text(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++)
proto_item_append_text(ti, "%s%02x", z ? ":" : "", mac[z]);
break;
case IAPP_PDU_CAPABILITY:
{
int mask, first = 1;
val = tvb_get_guint8(tvb, offset + 3);
proto_item_append_text(ti, "%02x (", val);
for (mask = 0x80; mask; mask >>= 1)
if (val & mask)
{
strval = match_strval(mask, iapp_cap_vals);
if (strval)
{
if (!first)
proto_item_append_text(ti, " ");
proto_item_append_text(ti, "%s", strval);
}
}
proto_item_append_text(ti, ")");
break;
}
case IAPP_PDU_ANNOUNCEINT:
val = tvb_get_ntohs(tvb, offset + 3);
proto_item_append_text(ti, "%d seconds", val);
break;
case IAPP_PDU_HOTIMEOUT:
case IAPP_PDU_BEACONINT:
val = tvb_get_ntohs(tvb, offset + 3);
proto_item_append_text(ti, "%d Kus", val);
break;
case IAPP_PDU_MESSAGEID:
val = tvb_get_ntohs(tvb, offset + 3);
proto_item_append_text(ti, "%d", val);
break;
case IAPP_PDU_PHYTYPE:
val = tvb_get_guint8(tvb, offset + 3);
strval = val_to_str(val, iapp_phy_vals, "Unknown");
proto_item_append_text(ti, "%s", 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");
proto_item_append_text(ti, "%s", strval);
break;
case IAPP_PDU_CHANNEL:
val = tvb_get_guint8(tvb, offset + 3);
if (is_fhss)
proto_item_append_text(ti, "Pattern set %d, sequence %d",
((val >> 6) & 3) + 1, (val & 31) + 1);
else
proto_item_append_text(ti, "%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");
proto_item_append_text(ti, "%s", strval);
break;
}
return is_fhss;
}
/* 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;
proto_item *ti;
gboolean is_fhss;
if (!pdulen)
{
proto_tree_add_text(pdutree, tvb, offset, 0, "No PDUs found");
return;
}
is_fhss = FALSE;
while (pdulen > 0)
{
tvb_memcpy(tvb, (guint8 *)&pduhdr, offset, sizeof(e_pduhdr));
len = (((int)pduhdr.pdu_len_h) << 8) + pduhdr.pdu_len_l;
ti = proto_tree_add_text(pdutree, tvb, offset, len + 3,
"%s(%d)",
val_to_str(pduhdr.pdu_type, iapp_pdu_type_vals,
"Unknown PDU Type"),
pduhdr.pdu_type);
is_fhss = append_pduval_str(ti, pduhdr.pdu_type, len, tvb,
offset, is_fhss);
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;
const 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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