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packet-aim.c
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/* packet-aim.c
* Routines for AIM Instant Messenger (OSCAR) dissection
* Copyright 2000, Ralf Hoelzer <ralf@well.com>
*
* $Id: packet-aim.c,v 1.7 2001/01/22 08:03:44 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@unicom.net>
* 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>
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#include <glib.h>
#ifdef NEED_SNPRINTF_H
# include "snprintf.h"
#endif
#include "packet.h"
#include "strutil.h"
#define TCP_PORT_AIM 5190
#define MAX_BUDDYNAME_LENGTH 30
#define STRIP_TAGS 1
/* channels */
#define CHANNEL_NEW_CONN 0x01
#define CHANNEL_SNAC_DATA 0x02
#define CHANNEL_FLAP_ERR 0x03
#define CHANNEL_CLOSE_CONN 0x04
/* SNAC families */
#define FAMILY_GENERIC 0x0001
#define FAMILY_LOCATION 0x0002
#define FAMILY_BUDDYLIST 0x0003
#define FAMILY_MESSAGING 0x0004
#define FAMILY_ADVERTS 0x0005
#define FAMILY_INVITATION 0x0006
#define FAMILY_ADMIN 0x0007
#define FAMILY_POPUP 0x0008
#define FAMILY_BOS 0x0009
#define FAMILY_USERLOOKUP 0x000A
#define FAMILY_STATS 0x000B
#define FAMILY_TRANSLATE 0x000C
#define FAMILY_CHAT_NAV 0x000D
#define FAMILY_CHAT 0x000E
#define FAMILY_SIGNON 0x0017
/* messaging */
#define MSG_TO_CLIENT 0x006
#define MSG_FROM_CLIENT 0x007
static void dissect_aim(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
static void get_message( u_char *msg, tvbuff_t *tvb, int msg_offset, int msg_length);
static int get_buddyname( char *name, tvbuff_t *tvb, int len_offset, int name_offset);
/* Initialize the protocol and registered fields */
static int proto_aim = -1;
static int hf_aim_cmd_start = -1;
static int hf_aim_channel = -1;
static int hf_aim_seqno = -1;
static int hf_aim_data_len = -1;
static int hf_aim_fnac_family = -1;
static int hf_aim_fnac_subtype = -1;
/* Initialize the subtree pointers */
static gint ett_aim = -1;
static gint ett_aim_fnac = -1;
/* Code to actually dissect the packets */
static void dissect_aim(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
/* Header fields */
unsigned char hdr_channel; /* channel ID */
unsigned short hdr_sequence_no; /* Internal frame sequence number, not needed */
unsigned short hdr_data_field_length; /* length of data within frame */
guint16 family;
guint16 subtype;
guint8 buddyname_length = 0;
char buddyname[MAX_BUDDYNAME_LENGTH];
u_char msg[1000];
/* Set up structures we will need to add the protocol subtree and manage it */
proto_item *ti;
proto_item *ti1;
proto_tree *aim_tree = NULL;
proto_tree *aim_tree_fnac = NULL;
/* check, if this is really an AIM packet, they start with 0x2a */
if(!(tvb_get_guint8(tvb, 0) == 0x2a)) {
/* Not an instant messenger packet, just happened to use the same port */
return;
}
/* Make entries in Protocol column and Info column on summary display */
if (check_col(pinfo->fd, COL_PROTOCOL))
col_set_str(pinfo->fd, COL_PROTOCOL, "AIM");
if (check_col(pinfo->fd, COL_INFO))
col_add_str(pinfo->fd, COL_INFO, "AOL Instant Messenger");
/* get relevant header information */
hdr_channel = tvb_get_guint8(tvb, 1);
hdr_sequence_no = tvb_get_ntohs(tvb, 2);
hdr_data_field_length = tvb_get_ntohs(tvb, 4);
/* In the interest of speed, if "tree" is NULL, don't do any work not
necessary to generate protocol tree items. */
if (tree) {
ti = proto_tree_add_item(tree, proto_aim, tvb, 0, tvb_length(tvb), FALSE);
aim_tree = proto_item_add_subtree(ti, ett_aim);
proto_tree_add_uint(aim_tree, hf_aim_cmd_start, tvb, 0, 1, '*');
proto_tree_add_uint(aim_tree, hf_aim_channel, tvb, 1, 1, hdr_channel);
proto_tree_add_uint(aim_tree, hf_aim_seqno, tvb, 2, 2, hdr_sequence_no);
proto_tree_add_uint(aim_tree, hf_aim_data_len, tvb, 4, 2, hdr_data_field_length);
}
switch(hdr_channel)
{
/* New connection request */
case CHANNEL_NEW_CONN:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "New Connection");
break;
/* SNAC channel. Most packets are of this type, such as messages or buddy list
* management.
*/
case CHANNEL_SNAC_DATA:
family = tvb_get_ntohs(tvb, 6);
subtype = tvb_get_ntohs(tvb, 8);
if (check_col(pinfo->fd, COL_INFO)) {
col_add_fstr(pinfo->fd, COL_INFO, "SNAC data");
}
if( tree )
{
ti1 = proto_tree_add_text(aim_tree, tvb, 6, tvb_length(tvb) - 6, "FNAC");
aim_tree_fnac = proto_item_add_subtree(ti1, ett_aim_fnac);
proto_tree_add_uint(aim_tree_fnac, hf_aim_fnac_family, tvb, 6, 2, family);
proto_tree_add_uint(aim_tree_fnac, hf_aim_fnac_subtype, tvb, 8, 2, subtype);
}
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Family: %d - Subtype: %d (unknown)", family, subtype);
switch(family)
{
case FAMILY_SIGNON:
switch(subtype)
{
case 0x0002:
buddyname_length = get_buddyname( buddyname, tvb, 19, 20 );
if (check_col(pinfo->fd, COL_INFO)) {
col_add_fstr(pinfo->fd, COL_INFO, "Login");
col_append_fstr(pinfo->fd, COL_INFO, ": %s", buddyname);
}
if( tree )
{
proto_tree_add_text(aim_tree_fnac, tvb, 20, buddyname_length, "Screen Name: %s", buddyname);
}
break;
case 0x0003:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Login information reply");
break;
case 0x0006:
buddyname_length = get_buddyname( buddyname, tvb, 19, 20 );
if (check_col(pinfo->fd, COL_INFO)) {
col_add_fstr(pinfo->fd, COL_INFO, "Sign-on");
col_append_fstr(pinfo->fd, COL_INFO, ": %s", buddyname);
}
if( tree )
{
proto_tree_add_text(aim_tree_fnac, tvb, 20, buddyname_length, "Screen Name: %s", buddyname);
}
break;
case 0x0007:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Sign-on reply");
break;
}
break;
case FAMILY_GENERIC:
switch(subtype)
{
case 0x0002:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Client is now online and ready for normal function");
break;
case 0x0003:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Server is now ready for normal functions");
break;
case 0x0004:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Request for new service (server will redirect client)");
break;
case 0x0005:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Redirect response");
break;
case 0x0006:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Request Rate Information");
break;
case 0x0007:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Rate information response");
break;
case 0x0008:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Rate Information Response Ack");
break;
case 0x0016:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "No-op");
break;
}
break;
case FAMILY_BUDDYLIST:
switch(subtype)
{
case 0x0001:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Buddylist - Error");
break;
case 0x0002:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Request Rights information");
break;
case 0x0003:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Rights information");
break;
case 0x0004:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Add to Buddylist");
break;
case 0x0005:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Remove from Buddylist");
break;
case 0x000b:
buddyname_length = get_buddyname( buddyname, tvb, 16, 17 );
if (check_col(pinfo->fd, COL_INFO)) {
col_add_fstr(pinfo->fd, COL_INFO, "Oncoming Buddy");
col_append_fstr(pinfo->fd, COL_INFO, ": %s", buddyname);
}
if( tree )
{
proto_tree_add_text(aim_tree_fnac, tvb, 17, buddyname_length, "Screen Name: %s", buddyname);
}
break;
case 0x000c:
buddyname_length = get_buddyname( buddyname, tvb, 16, 17 );
if (check_col(pinfo->fd, COL_INFO)) {
col_add_fstr(pinfo->fd, COL_INFO, "Offgoing Buddy");
col_append_fstr(pinfo->fd, COL_INFO, ": %s", buddyname);
}
if( tree )
{
proto_tree_add_text(aim_tree_fnac, tvb, 17, buddyname_length, "Screen Name: %s", buddyname);
}
break;
}
break;
case FAMILY_LOCATION:
switch(subtype)
{
case 0x0001:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Location - Error");
break;
case 0x0002:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Request Rights Information");
break;
case 0x0003:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Rights Information");
break;
case 0x0004:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Set User Information");
break;
case 0x0005:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Request User Information");
break;
case 0x0006:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "User Information");
break;
case 0x0007:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Watcher Subrequest");
break;
case 0x0008:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Watcher Notification");
break;
}
break;
case FAMILY_ADVERTS:
switch(subtype)
{
case 0x0001:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Advertisements - Error");
break;
case 0x0002:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Advertisement Request");
break;
case 0x0003:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Advertisement data (GIF)");
break;
}
break;
case FAMILY_USERLOOKUP:
switch(subtype)
{
case 0x0001:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Search - Error (could be: not found)");
break;
case 0x0002:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Search for Screen Name by e-mail");
break;
case 0x0003:
if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "Screen Name Search Result");
break;
}
break;
case FAMILY_CHAT:
switch(subtype)
{
case 0x005:
/* channel message from client */
get_message( msg, tvb, 40 + buddyname_length, tvb_length(tvb) - 40 - buddyname_length );
if (check_col(pinfo->fd, COL_INFO)) {
col_add_fstr(pinfo->fd, COL_INFO, "Chat Message ");
col_append_fstr(pinfo->fd, COL_INFO, " -> %s", msg);
}
break;
case 0x006:
/* channel message to client */
buddyname_length = get_buddyname( buddyname, tvb, 30, 31 );
get_message( msg, tvb, 36 + buddyname_length, tvb_length(tvb) - 36 - buddyname_length );
if (check_col(pinfo->fd, COL_INFO)) {
col_add_fstr(pinfo->fd, COL_INFO, "Chat Message ");
col_append_fstr(pinfo->fd, COL_INFO, "from: %s", buddyname);
col_append_fstr(pinfo->fd, COL_INFO, " -> %s", msg);
}
if( tree )
{
proto_tree_add_text(aim_tree_fnac, tvb, 31, buddyname_length, "Screen Name: %s", buddyname);
}
break;
}
break;
case FAMILY_MESSAGING:
switch(subtype)
{
case MSG_TO_CLIENT:
buddyname_length = get_buddyname( buddyname, tvb, 26, 27 );
get_message( msg, tvb, 36 + buddyname_length, tvb_length(tvb) - 36 - buddyname_length );
if (check_col(pinfo->fd, COL_INFO)) {
col_add_fstr(pinfo->fd, COL_INFO, "Message ");
col_append_fstr(pinfo->fd, COL_INFO, "to: %s", buddyname);
col_append_fstr(pinfo->fd, COL_INFO, " -> %s", msg);
}
if( tree )
{
proto_tree_add_text(aim_tree_fnac, tvb, 27, buddyname_length, "Screen Name: %s", buddyname);
}
break;
case MSG_FROM_CLIENT:
buddyname_length = get_buddyname( buddyname, tvb, 26, 27 );
get_message( msg, tvb, 36 + buddyname_length, tvb_length(tvb) - 36 - buddyname_length);
if (check_col(pinfo->fd, COL_INFO)) {
col_add_fstr(pinfo->fd, COL_INFO, "Message");
col_append_fstr(pinfo->fd, COL_INFO, " from: %s", buddyname);
col_append_fstr(pinfo->fd, COL_INFO, " -> %s", msg);
}
if( tree )
{
proto_tree_add_text(aim_tree_fnac, tvb, 27, buddyname_length, "Screen Name: %s", buddyname);
}
break;
}
break;
}
break;
case CHANNEL_FLAP_ERR:
if (check_col(pinfo->fd, COL_INFO)) {
col_add_fstr(pinfo->fd, COL_INFO, "FLAP error");
}
break;
case CHANNEL_CLOSE_CONN:
if (check_col(pinfo->fd, COL_INFO)) {
col_add_fstr(pinfo->fd, COL_INFO, "Close Connection");
}
break;
default:
if (check_col(pinfo->fd, COL_INFO)) {
col_add_fstr(pinfo->fd, COL_INFO, "Unknown Channel: %d", hdr_channel );
}
break;
}
}
static int get_buddyname( char *name, tvbuff_t *tvb, int len_offset, int name_offset)
{
guint8 buddyname_length;
buddyname_length = tvb_get_guint8(tvb, len_offset);
if(buddyname_length > MAX_BUDDYNAME_LENGTH ) buddyname_length = MAX_BUDDYNAME_LENGTH;
memset( name, '\0', sizeof(name));
tvb_get_nstringz0(tvb, name_offset, buddyname_length, name);
return buddyname_length;
}
static void get_message( u_char *msg, tvbuff_t *tvb, int msg_offset, int msg_length)
{
int i,j,c;
int bracket = FALSE;
int max, tagchars = 0;
int new_offset = msg_offset;
int new_length = msg_length;
/* make sure nothing bigger than 1000 bytes is printed */
if( msg_length > 999 ) return;
memset( msg, '\0', 1000);
i = 0;
c = 0;
/* loop until HTML tag is reached - quick&dirty way to find start of message
* (it is nearly impossible to find the correct start offset for all client versions) */
while( (tagchars < 6) && (new_length > 5) )
{
j = tvb_get_guint8(tvb, new_offset);
if( ( (j == '<') && (tagchars == 0) ) ||
( (j == 'h') && (tagchars == 1) ) ||
( (j == 'H') && (tagchars == 1) ) ||
( (j == 't') && (tagchars == 2) ) ||
( (j == 'T') && (tagchars == 2) ) ||
( (j == 'm') && (tagchars == 3) ) ||
( (j == 'M') && (tagchars == 3) ) ||
( (j == 'l') && (tagchars == 4) ) ||
( (j == 'L') && (tagchars == 4) ) ||
( (j == '>') && (tagchars == 5) ) ) tagchars++;
new_offset++;
new_length--;
}
/* set offset and length of message to after the first HTML tag */
msg_offset = new_offset;
msg_length = new_length;
max = msg_length - 1;
tagchars = 0;
/* find the rest of the message until either a </html> is reached or the end of the frame.
* All other HTML tags are stripped to display only the raw message (printable characters) */
while( (c < max) && (tagchars < 7) )
{
j = tvb_get_guint8(tvb, msg_offset+c);
/* make sure this is an HTML tag by checking the order of the chars */
if( ( (j == '<') && (tagchars == 0) ) ||
( (j == '/') && (tagchars == 1) ) ||
( (j == 'h') && (tagchars == 2) ) ||
( (j == 'H') && (tagchars == 2) ) ||
( (j == 't') && (tagchars == 3) ) ||
( (j == 'T') && (tagchars == 3) ) ||
( (j == 'm') && (tagchars == 4) ) ||
( (j == 'M') && (tagchars == 4) ) ||
( (j == 'l') && (tagchars == 5) ) ||
( (j == 'L') && (tagchars == 5) ) ||
( (j == '>') && (tagchars == 6) ) ) tagchars++;
#ifdef STRIP_TAGS
if( j == '<' ) bracket = TRUE;
if( j == '>' ) bracket = FALSE;
if( (isprint(j) ) && (bracket == FALSE) && (j != '>'))
#else
if( isprint(j) )
#endif
{
msg[i] = j;
i++;
}
c++;
}
}
/* Register the protocol with Ethereal */
void
proto_register_aim(void)
{
/* Setup list of header fields */
static hf_register_info hf[] = {
{ &hf_aim_cmd_start,
{ "Command Start", "aim.cmd_start", FT_UINT8, BASE_HEX, NULL, 0x0, "" }
},
{ &hf_aim_channel,
{ "Channel ID", "aim.channel", FT_UINT8, BASE_HEX, NULL, 0x0, "" }
},
{ &hf_aim_seqno,
{ "Sequence Number", "aim.seqno", FT_UINT16, BASE_DEC, NULL, 0x0, "" }
},
{ &hf_aim_data_len,
{ "Data Field Length", "aim.datalen", FT_UINT16, BASE_DEC, NULL, 0x0, "" }
},
{ &hf_aim_fnac_family,
{ "FNAC Family ID", "aim.fnac.family", FT_UINT16, BASE_HEX, NULL, 0x0, "" }
},
{ &hf_aim_fnac_subtype,
{ "FNAC Subtype ID", "aim.fnac.subtype", FT_UINT16, BASE_HEX, NULL, 0x0, "" }
},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_aim,
&ett_aim_fnac,
};
/* Register the protocol name and description */
proto_aim = proto_register_protocol("AOL Instant Messenger", "AIM", "aim");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_aim, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
};
void
proto_reg_handoff_aim(void)
{
dissector_add("tcp.port", TCP_PORT_AIM, &dissect_aim, proto_aim);
}