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packet-aim-messaging.c

/* packet-aim-messaging.c
 * Routines for AIM Instant Messenger (OSCAR) dissection, SNAC Messaging
 * Copyright 2004, Jelmer Vernooij <jelmer@samba.org>
 * Copyright 2000, Ralf Hoelzer <ralf@well.com>
 * Copyright 2004, Devin Heitmueller <dheitmueller@netilla.com>
 *
 * $Id: packet-aim-messaging.c 32367 2010-04-03 21:55:23Z wmeier $
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#include <glib.h>

#include <epan/packet.h>
#include <epan/strutil.h>

#include "packet-aim.h"

#define FAMILY_MESSAGING  0x0004


#define INCOMING_CH1_MESSAGE_BLOCK     0x0002
#define INCOMING_CH1_SERVER_ACK_REQ    0x0003
#define INCOMING_CH1_MESSAGE_AUTH_RESP 0x0004
#define INCOMING_CH1_MESSAGE_OFFLINE   0x0006
#define INCOMING_CH1_ICON_PRESENT      0x0008
#define INCOMING_CH1_BUDDY_REQ         0x0009
#define INCOMING_CH1_TYPING            0x000b

static const aim_tlv messaging_incoming_ch1_tlvs[] = {
  { INCOMING_CH1_MESSAGE_BLOCK, "Message Block", dissect_aim_tlv_value_messageblock },
  { INCOMING_CH1_SERVER_ACK_REQ, "Server Ack Requested", dissect_aim_tlv_value_bytes },
  { INCOMING_CH1_MESSAGE_AUTH_RESP, "Message is Auto Response", dissect_aim_tlv_value_bytes },
  { INCOMING_CH1_MESSAGE_OFFLINE, "Message was received offline", dissect_aim_tlv_value_bytes },
  { INCOMING_CH1_ICON_PRESENT, "Icon present", dissect_aim_tlv_value_bytes },
  { INCOMING_CH1_BUDDY_REQ, "Buddy Req", dissect_aim_tlv_value_bytes },
  { INCOMING_CH1_TYPING, "Non-direct connect typing notification", dissect_aim_tlv_value_bytes },
  { 0, NULL, NULL },
};

static int dissect_aim_tlv_value_rendezvous(proto_item *ti, guint16 valueid _U_, tvbuff_t *tvb, packet_info *pinfo);
static int dissect_aim_tlv_value_extended_data(proto_item *ti, guint16 valueid _U_, tvbuff_t *tvb, packet_info *pinfo _U_);

#define ICBM_CHANNEL_IM       0x0001
#define ICBM_CHANNEL_RENDEZVOUS     0x0002

static const value_string icbm_channel_types[] = {
      { ICBM_CHANNEL_IM, "IM" },
      { ICBM_CHANNEL_RENDEZVOUS, "Rendezvous" },
      { 0, NULL },
};

#define INCOMING_CH2_SERVER_ACK_REQ          0x0003
#define INCOMING_CH2_RENDEZVOUS_DATA       0x0005

static const aim_tlv messaging_incoming_ch2_tlvs[] = {
  { INCOMING_CH2_SERVER_ACK_REQ, "Server Ack Requested", dissect_aim_tlv_value_bytes },
  { INCOMING_CH2_RENDEZVOUS_DATA, "Rendez Vous Data", dissect_aim_tlv_value_rendezvous },
  { 0, NULL, NULL },
};

#define RENDEZVOUS_TLV_CHANNEL                        0x0001
#define RENDEZVOUS_TLV_IP_ADDR                        0x0002
#define RENDEZVOUS_TLV_INT_IP                   0x0003
#define RENDEZVOUS_TLV_EXT_IP                   0x0004
#define RENDEZVOUS_TLV_EXT_PORT                       0x0005
#define RENDEZVOUS_TLV_DOWNLOAD_URL             0x0006
#define RENDEZVOUS_TLV_VERIFIED_DOWNLOAD_URL          0x0008
#define RENDEZVOUS_TLV_SEQ_NUM                        0x000A
#define RENDEZVOUS_TLV_CANCEL_REASON                  0x000B
#define RENDEZVOUS_TLV_INVITATION               0x000C
#define RENDEZVOUS_TLV_INVITE_MIME_CHARSET            0x000D
#define RENDEZVOUS_TLV_INVITE_MIME_LANG               0x000E
#define RENDEZVOUS_TLV_REQ_HOST_CHECK                 0x000F
#define RENDEZVOUS_TLV_REQ_USE_ARS              0x0010
#define RENDEZVOUS_TLV_REQ_SECURE               0x0011
#define RENDEZVOUS_TLV_MAX_PROTOCOL_VER               0x0012
#define RENDEZVOUS_TLV_MIN_PROTOCOL_VER               0x0013
#define RENDEZVOUS_TLV_COUNTER_REASON                 0x0014
#define RENDEZVOUS_TLV_INVITE_MIME_TYPE               0x0015
#define RENDEZVOUS_TLV_IP_ADDR_XOR              0x0016
#define RENDEZVOUS_TLV_PORT_XOR                       0x0017
#define RENDEZVOUS_TLV_ADDR_LIST                0x0018
#define RENDEZVOUS_TLV_SESSION_ID               0x0019
#define RENDEZVOUS_TLV_ROLLOVER_ID              0x001A
#define RENDEZVOUS_TLV_EXTENDED_DATA                  0x2711
#define RENDEZVOUS_TLV_ICHAT_INVITEES_DATA            0x277E

static const aim_tlv rendezvous_tlvs[] = {
      { RENDEZVOUS_TLV_CHANNEL, "Rendezvous ICBM Channel", dissect_aim_tlv_value_uint16 },
      { RENDEZVOUS_TLV_IP_ADDR, "Rendezvous IP", dissect_aim_tlv_value_ipv4 },
      { RENDEZVOUS_TLV_INT_IP, "Internal IP", dissect_aim_tlv_value_ipv4 },
      { RENDEZVOUS_TLV_EXT_IP, "External IP", dissect_aim_tlv_value_ipv4 },
      { RENDEZVOUS_TLV_EXT_PORT, "External Port", dissect_aim_tlv_value_uint16 },
      { RENDEZVOUS_TLV_DOWNLOAD_URL, "Service Support Download URL", dissect_aim_tlv_value_string },
      { RENDEZVOUS_TLV_VERIFIED_DOWNLOAD_URL, "Verified Service Support Download URL", dissect_aim_tlv_value_string },
      { RENDEZVOUS_TLV_SEQ_NUM, "Sequence Number", dissect_aim_tlv_value_uint16 },
      { RENDEZVOUS_TLV_CANCEL_REASON, "Cancel Reason", dissect_aim_tlv_value_uint16 },
      { RENDEZVOUS_TLV_INVITATION, "Invitation Text", dissect_aim_tlv_value_string },
      { RENDEZVOUS_TLV_INVITE_MIME_CHARSET, "Data MIME Type", dissect_aim_tlv_value_string },
      { RENDEZVOUS_TLV_INVITE_MIME_LANG, "Data Language", dissect_aim_tlv_value_string },
      { RENDEZVOUS_TLV_REQ_HOST_CHECK, "Request Host Check", NULL },
      { RENDEZVOUS_TLV_REQ_USE_ARS, "Request Data via Rendezvous Server", NULL },
      { RENDEZVOUS_TLV_REQ_SECURE, "Request SSL Connection", NULL },
      { RENDEZVOUS_TLV_MAX_PROTOCOL_VER, "Maximum Protocol Version", dissect_aim_tlv_value_uint16 },
      { RENDEZVOUS_TLV_MIN_PROTOCOL_VER, "Minimum Protocol Version", dissect_aim_tlv_value_uint16 },
      { RENDEZVOUS_TLV_COUNTER_REASON, "Counter Proposal Reason", dissect_aim_tlv_value_uint16 },
      { RENDEZVOUS_TLV_INVITE_MIME_TYPE, "Data MIME Type", dissect_aim_tlv_value_string },
      { RENDEZVOUS_TLV_IP_ADDR_XOR, "XORed Rendezvous IP", dissect_aim_tlv_value_ipv4 },
      { RENDEZVOUS_TLV_PORT_XOR, "XORed Port", dissect_aim_tlv_value_uint16 },
      { RENDEZVOUS_TLV_ADDR_LIST, "Address/Port List", dissect_aim_tlv_value_string08_array },
      { RENDEZVOUS_TLV_SESSION_ID, "Session ID", dissect_aim_tlv_value_string },
      { RENDEZVOUS_TLV_ROLLOVER_ID, "Rollover ID", dissect_aim_tlv_value_string },
/*
      The dissect_aim_tlv_value_extended_data function does not work for iChat generated rendezvous data
      { RENDEZVOUS_TLV_EXTENDED_DATA, "Extended Data", dissect_aim_tlv_value_extended_data },
*/
      { RENDEZVOUS_TLV_EXTENDED_DATA, "Extended Data", NULL },
      { RENDEZVOUS_TLV_ICHAT_INVITEES_DATA, "iChat Invitees Data", NULL },
      { 0, NULL, NULL },
};

#define MINITYPING_FINISHED_SIGN                0x0000
#define MINITYPING_TEXT_TYPED_SIGN              0x0001
#define MINITYPING_BEGUN_SIGN                   0x0002

static const value_string minityping_type[] _U_ = {
      {MINITYPING_FINISHED_SIGN, "Typing finished sign" },
      {MINITYPING_TEXT_TYPED_SIGN, "Text typed sign" },
      {MINITYPING_BEGUN_SIGN, "Typing begun sign" },
      {0, NULL }
};

#define RENDEZVOUS_MSG_REQUEST            0
#define RENDEZVOUS_MSG_CANCEL       1
#define RENDEZVOUS_MSG_ACCEPT             2

static const value_string rendezvous_msg_types[] = {
      { RENDEZVOUS_MSG_REQUEST, "Request" },
      { RENDEZVOUS_MSG_CANCEL, "Cancel" },
      { RENDEZVOUS_MSG_ACCEPT, "Accept" },
      { 0, NULL },
};

#define CLIENT_ERR__REASON_UNSUPPORTED_CHANNEL  1
#define CLIENT_ERR__REASON_BUSTED_PAYLOAD 2
#define CLIENT_ERR__REASON_CHANNEL_SPECIFIC     3

static const value_string client_err_reason_types[] = {
      { CLIENT_ERR__REASON_UNSUPPORTED_CHANNEL, "Unsupported Channel" },
      { CLIENT_ERR__REASON_BUSTED_PAYLOAD, "Busted Payload" },
      { CLIENT_ERR__REASON_CHANNEL_SPECIFIC, "Channel Specific Error" },
      { 0, NULL },
};

#define RENDEZVOUS_NAK_PROPOSAL_UNSUPPORTED 0
#define RENDEZVOUS_NAK_PROPOSAL_DENIED 1
#define RENDEZVOUS_NAK_PROPOSAL_IGNORED 2
#define RENDEZVOUS_NAK_BUSTED_PARAMETERS 3
#define RENDEZVOUS_NAK_PROPOSAL_TIMED_OUT 4
#define RENDEZVOUS_NAK_ONLINE_BUT_NOT_AVAILABLE 5
#define RENDEZVOUS_NAK_INSUFFICIENT_RESOURCES 6
#define RENDEZVOUS_NAK_RATE_LIMITED 7
#define RENDEZVOUS_NAK_NO_DATA 8
#define RENDEZVOUS_NAK_VERSION_MISMATCH 9
#define RENDEZVOUS_NAK_SECURITY_MISMATCH 10
#define RENDEZVOUS_NAK_SERVICE_SPECIFIC_REASON 15

static const value_string rendezvous_nak_reason_types[] = {
      { RENDEZVOUS_NAK_PROPOSAL_UNSUPPORTED, "Proposal UUID not supported" },
      { RENDEZVOUS_NAK_PROPOSAL_DENIED, "Not authorized, or user declined" },
      { RENDEZVOUS_NAK_PROPOSAL_IGNORED, "Proposal ignored" },
      { RENDEZVOUS_NAK_BUSTED_PARAMETERS, "Proposal malformed" },
      { RENDEZVOUS_NAK_PROPOSAL_TIMED_OUT, "Attempt to act on proposal (e.g. connect) timed out" },
      { RENDEZVOUS_NAK_ONLINE_BUT_NOT_AVAILABLE, "Recipient away or busy" },
      { RENDEZVOUS_NAK_INSUFFICIENT_RESOURCES, "Recipient had internal error" },
      { RENDEZVOUS_NAK_RATE_LIMITED, "Recipient was ratelimited" },
      { RENDEZVOUS_NAK_NO_DATA, "Recipient had nothing to send" },
      { RENDEZVOUS_NAK_VERSION_MISMATCH, "Incompatible versions" },
      { RENDEZVOUS_NAK_SECURITY_MISMATCH, "Incompatible security settings" },
      { RENDEZVOUS_NAK_SERVICE_SPECIFIC_REASON, "Service-specific reject defined by client" },
      { 0, NULL },
};

#define EXTENDED_DATA_MTYPE_PLAIN 0x01
#define EXTENDED_DATA_MTYPE_CHAT 0x02
#define EXTENDED_DATA_MTYPE_FILEREQ 0x03
#define EXTENDED_DATA_MTYPE_URL 0x04
#define EXTENDED_DATA_MTYPE_AUTHREQ 0x06
#define EXTENDED_DATA_MTYPE_AUTHDENY 0x07
#define EXTENDED_DATA_MTYPE_AUTHOK 0x08
#define EXTENDED_DATA_MTYPE_SERVER 0x09
#define EXTENDED_DATA_MTYPE_ADDED 0x0C
#define EXTENDED_DATA_MTYPE_WWP 0x0D
#define EXTENDED_DATA_MTYPE_EEXPRESS 0x0E
#define EXTENDED_DATA_MTYPE_CONTACTS 0x13
#define EXTENDED_DATA_MTYPE_PLUGIN 0x1A
#define EXTENDED_DATA_MTYPE_AUTOAWAY 0xE8
#define EXTENDED_DATA_MTYPE_AUTOBUSY 0xE9
#define EXTENDED_DATA_MTYPE_AUTONA 0xEA
#define EXTENDED_DATA_MTYPE_AUTODND 0xEB
#define EXTENDED_DATA_MTYPE_AUTOFFC 0xEC

static const value_string extended_data_message_types[] = {
      {EXTENDED_DATA_MTYPE_PLAIN, "Plain text (simple) message"},
      {EXTENDED_DATA_MTYPE_CHAT, "Chat request message"},
      {EXTENDED_DATA_MTYPE_FILEREQ, "File request / file ok message"},
      {EXTENDED_DATA_MTYPE_URL, "URL message (0xFE formatted)"},
      {EXTENDED_DATA_MTYPE_AUTHREQ, "Authorization request message (0xFE formatted)"},
      {EXTENDED_DATA_MTYPE_AUTHDENY, "Authorization denied message (0xFE formatted)"},
      {EXTENDED_DATA_MTYPE_AUTHOK, "Authorization given message (empty)"},
      {EXTENDED_DATA_MTYPE_SERVER, "Message from OSCAR server (0xFE formatted)"},
      {EXTENDED_DATA_MTYPE_ADDED, "\"You-were-added\" message (0xFE formatted)"},
      {EXTENDED_DATA_MTYPE_WWP, "Web pager message (0xFE formatted)"},
      {EXTENDED_DATA_MTYPE_EEXPRESS, "Email express message (0xFE formatted)"},
      {EXTENDED_DATA_MTYPE_CONTACTS, "Contact list message"},
      {EXTENDED_DATA_MTYPE_PLUGIN, "Plugin message described by text string"},
      {EXTENDED_DATA_MTYPE_AUTOAWAY, "Auto away message"},
      {EXTENDED_DATA_MTYPE_AUTOBUSY, "Auto occupied message"},
      {EXTENDED_DATA_MTYPE_AUTONA, "Auto not available message"},
      {EXTENDED_DATA_MTYPE_AUTODND, "Auto do not disturb message"},
      {EXTENDED_DATA_MTYPE_AUTOFFC, "Auto free for chat message"},
      { 0, NULL },
};

#define EXTENDED_DATA_MFLAG_NORMAL 0x01
#define EXTENDED_DATA_MFLAG_AUTO 0x03
#define EXTENDED_DATA_MFLAG_MULTI 0x80

#define EVIL_ORIGIN_ANONYMOUS       1
#define EVIL_ORIGIN_NONANONYMOUS    2

static const value_string evil_origins[] = {
      {EVIL_ORIGIN_ANONYMOUS, "Anonymous"},
      {EVIL_ORIGIN_NONANONYMOUS, "Non-Anonymous"},
      {0, NULL },
};

/* Initialize the protocol and registered fields */
static int proto_aim_messaging = -1;
static int hf_aim_icbm_channel = -1;
static int hf_aim_icbm_cookie = -1;
static int hf_aim_icbm_msg_flags = -1;
static int hf_aim_icbm_max_sender_warnlevel = -1;
static int hf_aim_icbm_max_receiver_warnlevel = -1;
static int hf_aim_icbm_max_snac_size = -1;
static int hf_aim_icbm_min_msg_interval = -1;
static int hf_aim_icbm_notification_cookie = -1;
static int hf_aim_icbm_notification_channel = -1;
static int hf_aim_icbm_notification_type = -1;
static int hf_aim_icbm_rendezvous_nak = -1;
static int hf_aim_icbm_rendezvous_nak_length = -1;
static int hf_aim_message_channel_id = -1;
static int hf_aim_icbm_evil = -1;
static int hf_aim_evil_warn_level = -1;
static int hf_aim_evil_new_warn_level = -1;
static int hf_aim_rendezvous_msg_type = -1;
static int hf_aim_icbm_client_err_reason = -1;
static int hf_aim_icbm_client_err_protocol_version = -1;
static int hf_aim_icbm_client_err_client_caps_flags = -1;
static int hf_aim_rendezvous_extended_data_message_type = -1;
static int hf_aim_rendezvous_extended_data_message_flags = -1;
static int hf_aim_rendezvous_extended_data_message_flags_normal = -1;
static int hf_aim_rendezvous_extended_data_message_flags_auto = -1;
static int hf_aim_rendezvous_extended_data_message_flags_multi = -1;
static int hf_aim_rendezvous_extended_data_message_status_code = -1;
static int hf_aim_rendezvous_extended_data_message_priority_code = -1;
static int hf_aim_rendezvous_extended_data_message_text_length = -1;
static int hf_aim_rendezvous_extended_data_message_text = -1;

/* Initialize the subtree pointers */
static gint ett_aim_messaging = -1;
static gint ett_aim_rendezvous_data = -1;
static gint ett_aim_extended_data = -1;
static gint ett_aim_extended_data_message_flags = -1;

static int
dissect_aim_tlv_value_rendezvous(proto_item *ti, guint16 valueid _U_, tvbuff_t *tvb, packet_info *pinfo)
{
      int offset = 0;
      proto_tree *entry = proto_item_add_subtree(ti, ett_aim_rendezvous_data);
      proto_tree_add_item(entry, hf_aim_rendezvous_msg_type, tvb, offset, 2, FALSE);
      offset+=2;

      proto_tree_add_item(entry, hf_aim_icbm_cookie, tvb, offset, 8, FALSE);
      offset += 8;

      offset = dissect_aim_capability(entry, tvb, offset);

      return dissect_aim_tlv_sequence(tvb, pinfo, offset, entry,
                                          rendezvous_tlvs);
}

static int
dissect_aim_msg_outgoing(tvbuff_t *tvb, packet_info *pinfo, proto_tree *msg_tree)
{
      int offset = 0;
      const aim_tlv *ch_tlvs = NULL;
      guint16 channel_id;
      guchar buddyname[MAX_BUDDYNAME_LENGTH+1];
      int buddyname_length;

      /* ICBM Cookie */
      proto_tree_add_item(msg_tree, hf_aim_icbm_cookie, tvb, offset, 8, FALSE);
      offset += 8;

      /* Message Channel ID */
      channel_id = tvb_get_ntohs(tvb, offset);
      proto_tree_add_item(msg_tree, hf_aim_message_channel_id, tvb, offset, 2,
                                    FALSE);
      offset += 2;

      /* Add the outgoing username to the info column */
      buddyname_length = aim_get_buddyname(buddyname, tvb, offset,
                                            offset + 1);
      col_append_fstr(pinfo->cinfo, COL_INFO, " to: %s",
                      format_text(buddyname, buddyname_length));

      offset = dissect_aim_buddyname(tvb, pinfo, offset, msg_tree);

      switch(channel_id) {
      case ICBM_CHANNEL_IM: ch_tlvs = messaging_incoming_ch1_tlvs; break;
      case ICBM_CHANNEL_RENDEZVOUS: ch_tlvs = messaging_incoming_ch2_tlvs; break;
      default: return offset;
      }

      return dissect_aim_tlv_sequence(tvb, pinfo, offset, msg_tree, ch_tlvs);
}


static int
dissect_aim_msg_incoming(tvbuff_t *tvb, packet_info *pinfo, proto_tree *msg_tree)
{
      int offset = 0;
      const aim_tlv *ch_tlvs;
      guint16 channel_id;

      /* ICBM Cookie */
      proto_tree_add_item(msg_tree, hf_aim_icbm_cookie, tvb, offset, 8, FALSE);
      offset += 8;

      /* Message Channel ID */
      proto_tree_add_item(msg_tree, hf_aim_message_channel_id, tvb, offset, 2,
                                    FALSE);
      channel_id = tvb_get_ntohs(tvb, offset);
      offset += 2;

      offset = dissect_aim_userinfo(tvb, pinfo, offset, msg_tree);

      switch(channel_id) {
      case ICBM_CHANNEL_IM: ch_tlvs = messaging_incoming_ch1_tlvs; break;
      case ICBM_CHANNEL_RENDEZVOUS: ch_tlvs = messaging_incoming_ch2_tlvs; break;
      default: return offset;
      }

      return dissect_aim_tlv_sequence(tvb, pinfo, offset, msg_tree, ch_tlvs);
}

static int
dissect_aim_msg_params(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *msg_tree)
{
      int offset = 0;
      proto_tree_add_item(msg_tree, hf_aim_icbm_channel, tvb, offset, 2, tvb_get_ntohs(tvb, offset)); offset+=2;
      proto_tree_add_item(msg_tree, hf_aim_icbm_msg_flags, tvb, offset, 4, tvb_get_ntoh24(tvb, offset)); offset+=4;
      proto_tree_add_item(msg_tree, hf_aim_icbm_max_snac_size, tvb, offset, 2, tvb_get_ntohs(tvb, offset)); offset+=2;
      proto_tree_add_item(msg_tree, hf_aim_icbm_max_sender_warnlevel, tvb, offset, 2, tvb_get_ntohs(tvb, offset)); offset+=2;
      proto_tree_add_item(msg_tree, hf_aim_icbm_max_receiver_warnlevel, tvb, offset, 2, tvb_get_ntohs(tvb, offset)); offset+=2;
      proto_tree_add_item(msg_tree, hf_aim_icbm_min_msg_interval, tvb, offset, 4, tvb_get_ntohl(tvb, offset)); offset+=4;
      return offset;
}

static int
dissect_aim_msg_evil_req(tvbuff_t *tvb, packet_info *pinfo, proto_tree *msg_tree)
{
      int offset = 0;
      proto_tree_add_item(msg_tree, hf_aim_icbm_evil, tvb, offset, 2, tvb_get_ntohs(tvb, offset)); offset+=2;
      return dissect_aim_buddyname(tvb, pinfo, offset, msg_tree);
}


static int
dissect_aim_msg_evil_repl(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *msg_tree)
{
      int offset = 0;
      proto_tree_add_item(msg_tree, hf_aim_evil_warn_level, tvb, offset, 2, tvb_get_ntohs(tvb, offset)); offset+=2;
      proto_tree_add_item(msg_tree, hf_aim_evil_new_warn_level, tvb, offset, 2, tvb_get_ntohs(tvb, offset)); offset+=2;
      return offset;
}

static int
dissect_aim_msg_minityping(tvbuff_t *tvb, packet_info *pinfo, proto_tree *msg_tree)
{
      int offset = 0;
      proto_tree_add_item(msg_tree,hf_aim_icbm_notification_cookie, tvb, offset, 8, FALSE); offset+=8;
      proto_tree_add_item(msg_tree,hf_aim_icbm_notification_channel, tvb, offset, 2, tvb_get_ntohs(tvb, offset)); offset+=2;
      offset = dissect_aim_buddyname(tvb, pinfo, offset, msg_tree);
      proto_tree_add_item(msg_tree,hf_aim_icbm_notification_type, tvb, offset, 2, tvb_get_ntohs(tvb, offset)); offset+=2;
      return offset;
}

typedef struct _aim_client_plugin
{
      const char *name;
      e_uuid_t uuid;
} aim_client_plugin;

static const aim_client_plugin known_client_plugins[] = {
      { "None",
       {0x0, 0x0, 0x0,
            {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}}},

      { "Status Manager",
       {0xD140CF10, 0xE94F, 0x11D3,
            {0xBC, 0xD2, 0x00, 0x04, 0xAC, 0x96, 0xDD, 0x96}}},

      { NULL, {0x0, 0x0, 0x0, { 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 } } }
};

static const
aim_client_plugin *aim_find_plugin ( e_uuid_t uuid)
{
      int i;

      for(i = 0; known_client_plugins[i].name; i++)
      {
            const aim_client_plugin *plugin = &(known_client_plugins[i]);

            if(memcmp(&(plugin->uuid), &uuid, sizeof(e_uuid_t)) == 0)
                  return plugin;
      }

      return NULL;
}

static int
dissect_aim_plugin(proto_tree *entry, tvbuff_t *tvb, int offset, e_uuid_t* out_plugin_uuid)
{
      const aim_client_plugin *plugin = NULL;
      e_uuid_t uuid;

      uuid.Data1 = tvb_get_ntohl(tvb, offset);
      uuid.Data2 = tvb_get_ntohs(tvb, offset+4);
      uuid.Data3 = tvb_get_ntohs(tvb, offset+6);
      tvb_memcpy(tvb, uuid.Data4, offset+8, 8);
      if (out_plugin_uuid)
            *out_plugin_uuid = uuid;

      plugin = aim_find_plugin(uuid);

      proto_tree_add_text(entry, tvb, offset, 16,
            "Plugin: %s {%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x}",
            plugin ? plugin->name:"Unknown", uuid.Data1, uuid.Data2,
            uuid.Data3, uuid.Data4[0], uuid.Data4[1], uuid.Data4[2],
            uuid.Data4[3], uuid.Data4[4], uuid.Data4[5], uuid.Data4[6],
                  uuid.Data4[7]
      );

      return offset+16;
}

static int
dissect_aim_rendezvous_extended_message(tvbuff_t *tvb, proto_tree *msg_tree)
{
      guint8 message_type, message_flags;
      int offset = 0;
      proto_item *ti_flags;
      proto_tree *flags_entry;
      guint16 text_length;
      guint8* text;

      message_type = tvb_get_guint8(tvb, offset);
      proto_tree_add_item(msg_tree, hf_aim_rendezvous_extended_data_message_type, tvb, offset, 1, FALSE); offset+=1;
      message_flags = tvb_get_guint8(tvb, offset);
      ti_flags = proto_tree_add_item(msg_tree, hf_aim_rendezvous_extended_data_message_flags, tvb, offset, 1, message_flags);
      flags_entry = proto_item_add_subtree(ti_flags, ett_aim_extended_data_message_flags);
      proto_tree_add_boolean(flags_entry, hf_aim_rendezvous_extended_data_message_flags_normal, tvb, offset, 1, message_flags);
      proto_tree_add_boolean(flags_entry, hf_aim_rendezvous_extended_data_message_flags_auto, tvb, offset, 1, message_flags);
      proto_tree_add_boolean(flags_entry, hf_aim_rendezvous_extended_data_message_flags_multi, tvb, offset, 1, message_flags);
      offset+=1;
      proto_tree_add_item(msg_tree, hf_aim_rendezvous_extended_data_message_status_code, tvb, offset, 2, TRUE); offset+=2;
      proto_tree_add_item(msg_tree, hf_aim_rendezvous_extended_data_message_priority_code, tvb, offset, 2, TRUE); offset+=2;
      text_length = tvb_get_letohs(tvb, offset);
      proto_tree_add_item(msg_tree, hf_aim_rendezvous_extended_data_message_text_length, tvb, offset, 2, TRUE); offset+=2;
      text = tvb_get_ephemeral_string(tvb, offset, text_length);
      proto_tree_add_text(msg_tree, tvb, offset, text_length, "Text: %s", text); offset+=text_length;
      offset = tvb->length;

      return offset;
}

static int
is_uuid_null(e_uuid_t uuid)
{
      return (uuid.Data1 == 0) &&
             (uuid.Data2 == 0) &&
             (uuid.Data3 == 0) &&
             (uuid.Data4[0] == 0) &&
             (uuid.Data4[1] == 0) &&
             (uuid.Data4[2] == 0) &&
             (uuid.Data4[3] == 0) &&
             (uuid.Data4[4] == 0) &&
             (uuid.Data4[5] == 0) &&
             (uuid.Data4[6] == 0) &&
             (uuid.Data4[7] == 0);
}

static int
dissect_aim_tlv_value_extended_data(proto_item *ti, guint16 valueid _U_, tvbuff_t *tvb, packet_info *pinfo _U_)
{
      int offset = 0;
      guint16 length, protocol_version;
      int start_offset;
      proto_tree *entry;
      e_uuid_t plugin_uuid;

      entry = proto_item_add_subtree(ti, ett_aim_extended_data);
      length = tvb_get_letohs(tvb, offset);
      proto_tree_add_text(entry, tvb, offset, 2, "Length: %d", length); offset+=2;
      start_offset = offset;
      protocol_version = tvb_get_ntohs(tvb, offset);
      proto_tree_add_item(entry, hf_aim_icbm_client_err_protocol_version, tvb, offset, 2, TRUE); offset+=2;

      offset = dissect_aim_plugin(entry, tvb, offset, &plugin_uuid);
      proto_tree_add_text(entry, tvb, offset, 2, "Unknown"); offset += 2;
      proto_tree_add_item(entry, hf_aim_icbm_client_err_client_caps_flags, tvb, offset, 4, TRUE); offset+=4;
      proto_tree_add_text(entry, tvb, offset, 1, "Unknown");      offset += 1;
      proto_tree_add_text(entry, tvb, offset, 2, "Downcounter?"); offset += 2;

      offset = start_offset + length;

      length = tvb_get_letohs(tvb, offset);
      proto_tree_add_text(entry, tvb, offset, 2, "Length: %d", length); offset+=2;
      start_offset = offset;
      proto_tree_add_text(entry, tvb, offset, 2, "Downcounter?"); offset += 2;
      proto_tree_add_text(entry, tvb, offset, length-2, "Unknown");
      offset = start_offset + length;

      if (is_uuid_null(plugin_uuid))
      {
              /* a message follows */
              tvbuff_t *subtvb = tvb_new_subset_remaining(tvb, offset);
              offset += dissect_aim_rendezvous_extended_message(subtvb, entry);
      }
      else
      {
              /* plugin-specific data follows */
              proto_tree_add_text(entry, tvb, offset, -1, "Plugin-specific data");
      }
      offset = tvb->length;

      return offset;
}

static int
dissect_aim_msg_ack(tvbuff_t *tvb, packet_info *pinfo, proto_tree *msg_tree)
{
      int offset = 0;

      proto_tree_add_item(msg_tree,hf_aim_icbm_cookie, tvb, offset, 8, FALSE); offset+=8;

      proto_tree_add_item(msg_tree, hf_aim_message_channel_id, tvb, offset, 2,
                                    FALSE); offset += 2;

      offset = dissect_aim_buddyname(tvb, pinfo, offset, msg_tree);

      return offset;
}

static int
dissect_aim_msg_client_err(tvbuff_t *tvb, packet_info *pinfo, proto_tree *msg_tree)
{
      int offset = 0;
      guint16 channel, reason;

      proto_tree_add_item(msg_tree,hf_aim_icbm_cookie, tvb, offset, 8, FALSE); offset+=8;
      channel = tvb_get_ntohs(tvb, offset);
      proto_tree_add_item(msg_tree,hf_aim_icbm_channel, tvb, offset, 2, FALSE); offset+=2;
      offset = dissect_aim_buddyname(tvb, pinfo, offset, msg_tree);
      reason = tvb_get_ntohs(tvb, offset);
      proto_tree_add_item(msg_tree, hf_aim_icbm_client_err_reason, tvb, offset, 2, FALSE); offset+=2;

      if (reason == CLIENT_ERR__REASON_CHANNEL_SPECIFIC && tvb_length_remaining(tvb, offset) > 0)
      {
            switch (channel)
            {
            case ICBM_CHANNEL_RENDEZVOUS:
                  proto_tree_add_item(msg_tree, hf_aim_icbm_rendezvous_nak_length, tvb, offset, 2, FALSE); offset+=2;
                  proto_tree_add_item(msg_tree, hf_aim_icbm_rendezvous_nak, tvb, offset, 2, FALSE); offset+=2;
                  break;

            default:
              {
                tvbuff_t *subtvb = tvb_new_subset_remaining(tvb, offset);
                proto_item *ti_extended_data = proto_tree_add_text(msg_tree, tvb, offset, -1, "Extended Data");
                dissect_aim_tlv_value_extended_data(ti_extended_data, 0, subtvb, pinfo);
                break;
              }
            }
      }

      return offset;
}

static const aim_subtype aim_fnac_family_messaging[] = {
      { 0x0001, "Error", dissect_aim_snac_error },
      { 0x0002, "Set ICBM Parameter", dissect_aim_msg_params },
      { 0x0003, "Reset ICBM Parameter", NULL },
      { 0x0004, "Request Parameter Info", NULL},
      { 0x0005, "Parameter Info", dissect_aim_msg_params },
      { 0x0006, "Outgoing", dissect_aim_msg_outgoing },
      { 0x0007, "Incoming", dissect_aim_msg_incoming },
      { 0x0008, "Evil Request", dissect_aim_msg_evil_req },
      { 0x0009, "Evil Response", dissect_aim_msg_evil_repl  },
      { 0x000a, "Missed Call", NULL },
      { 0x000b, "Client Error", dissect_aim_msg_client_err },
      { 0x000c, "Acknowledge", dissect_aim_msg_ack },
      { 0x0014, "Mini Typing Notifications (MTN)", dissect_aim_msg_minityping },
      { 0, NULL, NULL }
};



/* Register the protocol with Wireshark */
void
proto_register_aim_messaging(void)
{

      /* Setup list of header fields */
      static hf_register_info hf[] = {
            { &hf_aim_icbm_channel,
                  { "Channel", "aim_messaging.icbm.channel", FT_UINT16, BASE_HEX, VALS(icbm_channel_types), 0x0, NULL, HFILL },
            },
            { &hf_aim_icbm_msg_flags,
                  { "Message Flags", "aim_messaging.icbm.flags", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL },
            },
            { &hf_aim_icbm_max_snac_size,
                  { "Max SNAC Size", "aim_messaging.icbm.max_snac", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL },
            },
            { &hf_aim_icbm_max_sender_warnlevel,
                  { "Max sender warn level", "aim_messaging.icbm.max_sender_warn-level", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL },
            },
            { &hf_aim_icbm_max_receiver_warnlevel,
                  { "max receiver warn level", "aim_messaging.icbm.max_receiver_warnlevel", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL },
            },
            { &hf_aim_icbm_min_msg_interval,
                  { "Minimum message interval (milliseconds)", "aim_messaging.icbm.min_msg_interval", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL },
            },
            { &hf_aim_icbm_cookie,
                  { "ICBM Cookie", "aim_messaging.icbmcookie", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
            },
            { &hf_aim_message_channel_id,
                  { "Message Channel ID", "aim_messaging.channelid", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }
            },
            { &hf_aim_icbm_evil,
                  { "Send Evil Bit As", "aim_messaging.evilreq.origin", FT_UINT16, BASE_DEC, VALS(evil_origins), 0x0, NULL, HFILL },
            },
            { &hf_aim_evil_warn_level,
                  { "Old warning level", "aim_messaging.evil.warn_level", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL },
            },
            { &hf_aim_evil_new_warn_level,
                  { "New warning level", "aim_messaging.evil.new_warn_level", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL },
            },
            { &hf_aim_icbm_notification_cookie,
                  { "Notification Cookie", "aim_messaging.notification.cookie", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL },
            },
            { &hf_aim_icbm_notification_channel,
                  { "Notification Channel", "aim_messaging.notification.channel", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL },
            },
            { &hf_aim_icbm_notification_type,
                  { "Notification Type", "aim_messaging.notification.type", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL },
            },
            { &hf_aim_icbm_rendezvous_nak,
                  { "Rendezvous NAK reason", "aim_messaging.rendezvous_nak", FT_UINT16, BASE_HEX, VALS(rendezvous_nak_reason_types), 0x0, NULL, HFILL },
            },
            { &hf_aim_icbm_rendezvous_nak_length,
                  { "Rendezvous NAK reason length", "aim_messaging.rendezvous_nak_length", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL },
            },
            { &hf_aim_rendezvous_msg_type,
                  { "Message Type", "aim_messaging.rendezvous.msg_type", FT_UINT16, BASE_HEX, VALS(rendezvous_msg_types), 0x0, NULL, HFILL },
            },
            { &hf_aim_icbm_client_err_reason,
                  { "Reason", "aim_messaging.clienterr.reason", FT_UINT16, BASE_DEC, VALS(client_err_reason_types), 0x0, NULL, HFILL },
            },
            { &hf_aim_icbm_client_err_protocol_version,
                  { "Version", "aim_messaging.clienterr.protocol_version", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL },
            },
            { &hf_aim_icbm_client_err_client_caps_flags,
                  { "Client Capabilities Flags", "aim_messaging.clienterr.client_caps_flags", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL },
            },
            { &hf_aim_rendezvous_extended_data_message_type,
                  { "Message Type", "aim_messaging.icbm.extended_data.message.type", FT_UINT8, BASE_HEX, VALS(extended_data_message_types), 0x0, NULL, HFILL },
            },
            { &hf_aim_rendezvous_extended_data_message_flags,
                  { "Message Flags", "aim_messaging.icbm.extended_data.message.flags", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL },
            },
            { &hf_aim_rendezvous_extended_data_message_flags_normal,
                  { "Normal Message", "aim_messaging.icbm.extended_data.message.flags.normal", FT_BOOLEAN, 16, TFS(&tfs_set_notset), EXTENDED_DATA_MFLAG_NORMAL, NULL, HFILL },
            },
            { &hf_aim_rendezvous_extended_data_message_flags_auto,
                  { "Auto Message", "aim_messaging.icbm.extended_data.message.flags.auto", FT_BOOLEAN, 16, TFS(&tfs_set_notset), EXTENDED_DATA_MFLAG_AUTO, NULL, HFILL },
            },
            { &hf_aim_rendezvous_extended_data_message_flags_multi,
                  { "Multiple Recipients Message", "aim_messaging.icbm.rendezvous.extended_data.message.flags.multi", FT_BOOLEAN, 16, TFS(&tfs_set_notset), EXTENDED_DATA_MFLAG_MULTI, NULL, HFILL },
            },
            { &hf_aim_rendezvous_extended_data_message_status_code,
                  { "Status Code", "aim_messaging.icbm.extended_data.message.status_code", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL },
            },
            { &hf_aim_rendezvous_extended_data_message_priority_code,
                  { "Priority Code", "aim_messaging.icbm.extended_data.message.priority_code", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL },
            },
            { &hf_aim_rendezvous_extended_data_message_text_length,
                  { "Text Length", "aim_messaging.icbm.extended_data.message.text_length", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL },
            },
            { &hf_aim_rendezvous_extended_data_message_text,
                  { "Text", "aim_messaging.icbm.extended_data.message.text", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL },
            }
      };

      /* Setup protocol subtree array */
      static gint *ett[] = {
            &ett_aim_messaging,
            &ett_aim_rendezvous_data,
            &ett_aim_extended_data,
            &ett_aim_extended_data_message_flags
      };

      /* Register the protocol name and description */
      proto_aim_messaging = proto_register_protocol("AIM Messaging", "AIM Messaging", "aim_messaging");

      /* Required function calls to register the header fields and subtrees used */
      proto_register_field_array(proto_aim_messaging, hf, array_length(hf));
      proto_register_subtree_array(ett, array_length(ett));
}

void
proto_reg_handoff_aim_messaging(void)
{
      aim_init_family(proto_aim_messaging, ett_aim_messaging, FAMILY_MESSAGING, aim_fnac_family_messaging);
}

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