/* packet-iapp.c
 * Routines for IAPP dissection
 * Copyright 2002, Alfred Arnold <aarnold@elsa.de>
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "config.h"

#include <epan/packet.h>
#include <epan/to_str.h>
#include <epan/oui.h>

void proto_register_iapp(void);
void proto_reg_handoff_iapp(void);

/* 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 const 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 const 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 const value_string iapp_cap_vals[] = {
    {IAPP_CAP_FORWARDING, "Forwarding"},
    {IAPP_CAP_WEP, "WEP"},
    {0, NULL}
};

static const 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 const 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 const 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, thisbit;
    const gchar *strval;
    gchar bitval[4+1+4+1];    /* "xxxx xxxx\0" */

    captree = proto_item_add_subtree(pitem, ett_iapp_cap);
    val = tvb_get_guint8(tvb, offset + 3);

    for (bit = 7; bit >= 0; bit--)
    {
        thisbit = 1 << bit;
        strval = try_val_to_str(thisbit, iapp_cap_vals);
        if (strval)
        {
            other_decode_bitfield_value(bitval, val, thisbit, 8);
            proto_tree_add_text(captree, tvb, offset + 3, 1, "%s %s: %s",
                bitval, strval, val & 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", tvb_ip_to_str(tvb, offset + 3));
            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_const(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)
{
    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:
            for (z = 0; z < len; z++)
                proto_item_append_text(ti, "%s%02x", z ? ":" : "",
                               tvb_get_guint8(tvb, offset + 3 + 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 = try_val_to_str(mask, iapp_cap_vals);
                    if (strval)
                    {
                        if (!first)
                            proto_item_append_text(ti, " ");
                        proto_item_append_text(ti, "%s", strval);
                        first=0;
                    }
                }
            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_const(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_const(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_const(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_const(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;

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "IAPP");

    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_const(ia_type, iapp_vals, "Unknown Packet");
    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, ENC_NA);
        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_value(iapp_tree, hf_iapp_type, tvb, 1, 1,
            ih.ia_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_captured_length_remaining(tvb, 2));
        }
    }
}


/* Register the protocol with Wireshark */

/* 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)
{

    static hf_register_info hf[] = {
        { &hf_iapp_version,
            { "Version", "iapp.version", FT_UINT8, BASE_DEC, NULL, 0x00, NULL, HFILL }
        },
        { &hf_iapp_type,
            { "Type", "iapp.type", FT_UINT8, BASE_DEC, NULL, 0x00, NULL, HFILL }
        },
    };

    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_uint("udp.port", UDP_PORT_IAPP, iapp_handle);
}
/*
 * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
 *
 * Local variables:
 * c-basic-offset: 4
 * tab-width: 8
 * indent-tabs-mode: nil
 * End:
 *
 * vi: set shiftwidth=4 tabstop=8 expandtab:
 * :indentSize=4:tabSize=8:noTabs=true:
 */