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wireshark/packet-dsi.c

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/* packet-dsi.c
* Routines for dsi packet dissection
* Copyright 2001, Randy McEoin <rmceoin@pe.com>
*
* $Id: packet-dsi.c,v 1.2 2001/06/18 02:17:46 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
* Copyright 1998 Gerald Combs
*
* Copied from packet-pop.c
*
*
* 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>
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#include <string.h>
#include <glib.h>
#include "packet.h"
#include "strutil.h"
#include "conversation.h"
/* The information in this module (DSI) comes from:
AFP 2.1 & 2.2.pdf contained in AppleShare_IP_6.3_SDK
available from http://www.apple.com
The netatalk source code by Wesley Craig & Adrian Sun
* What a Data Stream Interface packet looks like:
* 0 32
* |-------------------------------|
* |flags |command| requestID |
* |-------------------------------|
* |error code/enclosed data offset|
* |-------------------------------|
* |total data length |
* |-------------------------------|
* |reserved field |
* |-------------------------------|
*/
static int proto_dsi = -1;
static int hf_dsi_flags = -1;
static int hf_dsi_command = -1;
static int hf_dsi_requestid = -1;
static int hf_dsi_code = -1;
static int hf_dsi_length = -1;
static int hf_dsi_reserved = -1;
static gint ett_dsi = -1;
#define TCP_PORT_DSI 548
/* DSI flags */
#define DSIFL_REQUEST 0x00
#define DSIFL_REPLY 0x01
#define DSIFL_MAX 0x01
/* DSI Commands */
#define DSIFUNC_CLOSE 1 /* DSICloseSession */
#define DSIFUNC_CMD 2 /* DSICommand */
#define DSIFUNC_STAT 3 /* DSIGetStatus */
#define DSIFUNC_OPEN 4 /* DSIOpenSession */
#define DSIFUNC_TICKLE 5 /* DSITickle */
#define DSIFUNC_WRITE 6 /* DSIWrite */
#define DSIFUNC_ATTN 8 /* DSIAttention */
#define DSIFUNC_MAX 8 /* largest command */
static const value_string flag_vals[] = {
{DSIFL_REQUEST, "Request" },
{DSIFL_REPLY, "Reply" },
{0, NULL } };
static const value_string func_vals[] = {
{DSIFUNC_CLOSE, "CloseSession" },
{DSIFUNC_CMD, "Command" },
{DSIFUNC_STAT, "GetStatus" },
{DSIFUNC_OPEN, "OpenSession" },
{DSIFUNC_TICKLE, "Tickle" },
{DSIFUNC_WRITE, "Write" },
{DSIFUNC_ATTN, "Attention" },
{0, NULL } };
static GMemChunk *vals = NULL;
typedef struct {
int state;
guint8 flags,command;
guint16 requestid;
guint32 code;
guint32 length; /* total length of this DSI request/reply */
guint32 reserved;
guint32 seen; /* bytes seen so far */
}hash_entry_t;
enum {NONE,FIRSTDATA,MOREDATA,DONE};
#define hash_init_count 20
#define hash_val_length (sizeof(hash_entry_t))
static guint32 last_abs_sec = 0;
static guint32 last_abs_usec= 0;
static guint32 highest_num = 0;
/* Hash functions */
gint dsi_equal (gconstpointer v, gconstpointer v2);
guint dsi_hash (gconstpointer v);
static guint dsi_packet_init_count = 200;
typedef struct {
guint32 packetnum;
} dsi_request_key;
typedef struct {
guint8 flags;
guint8 command;
guint16 requestid;
guint32 length;
guint32 seen; /* bytes seen so far, including this packet */
} dsi_request_val;
static GHashTable *dsi_request_hash = NULL;
static GMemChunk *dsi_request_keys = NULL;
static GMemChunk *dsi_request_records = NULL;
/* Hash Functions */
gint dsi_equal (gconstpointer v, gconstpointer v2)
{
dsi_request_key *val1 = (dsi_request_key*)v;
dsi_request_key *val2 = (dsi_request_key*)v2;
if (val1->packetnum == val2->packetnum) {
return 1;
}
return 0;
}
guint dsi_hash (gconstpointer v)
{
dsi_request_key *dsi_key = (dsi_request_key*)v;
return GPOINTER_TO_UINT(dsi_key->packetnum);
}
void
dsi_hash_insert(guint32 packetnum, guint8 flags, guint8 command,
guint16 requestid, guint32 length, guint32 seen)
{
dsi_request_val *request_val;
dsi_request_key *request_key;
/* Now remember info about this continuation packet */
request_key = g_mem_chunk_alloc(dsi_request_keys);
request_key->packetnum = packetnum;
request_val = g_mem_chunk_alloc(dsi_request_records);
request_val->flags = flags;
request_val->command = command;
request_val->requestid = requestid;
request_val->length = length;
request_val->seen = seen;
g_hash_table_insert(dsi_request_hash, request_key, request_val);
}
/* Returns TRUE or FALSE. If TRUE, the record was found */
gboolean
dsi_hash_lookup(guint32 packetnum, guint8 *flags, guint8 *command,
guint16 *requestid, guint32 *length, guint32 *seen)
{
dsi_request_val *request_val;
dsi_request_key request_key;
request_key.packetnum = packetnum;
request_val = (dsi_request_val*)
g_hash_table_lookup(dsi_request_hash, &request_key);
if (request_val) {
*flags = request_val->flags;
*command = request_val->command;
*requestid = request_val->requestid;
*length = request_val->length;
*seen = request_val->seen;
return TRUE;
}
else {
return FALSE;
}
}
/* The state_machine remembers information about continuation packets */
/* returns TRUE if it found a previously known continuation packet */
gboolean
dsi_state_machine( hash_entry_t *hash_info, tvbuff_t *tvb, packet_info *pinfo,
int offset)
{
frame_data *fd;
guint32 data_here;
guint8 flags,command;
guint16 requestid;
guint32 length;
guint32 seen;
gboolean found_hash;
fd=pinfo->fd;
found_hash=dsi_hash_lookup(fd->num, &flags, &command, &requestid,
&length, &seen);
if (found_hash==TRUE)
{
hash_info->flags = flags;
hash_info->command = command;
hash_info->requestid = requestid;
hash_info->length = length;
hash_info->seen = seen;
return TRUE;
}
/* is this sequentially the next packet? */
if (highest_num > fd->num)
{
hash_info->state = NONE;
return FALSE;
}
highest_num = fd->num;
if ((hash_info->state == NONE) || (hash_info->state == DONE))
{
hash_info->state = NONE;
hash_info->length = tvb_get_ntohl(tvb, offset+8);
data_here = tvb_length_remaining(tvb, offset+16);
if (data_here < hash_info->length)
{
hash_info->flags = tvb_get_guint8(tvb, offset);
hash_info->command = tvb_get_guint8(tvb, offset+1);
hash_info->requestid = tvb_get_ntohs(tvb, offset+2);
hash_info->code = tvb_get_ntohl(tvb, offset+4);
hash_info->reserved = tvb_get_ntohl(tvb, offset+12);
hash_info->seen = data_here;
hash_info->state = FIRSTDATA;
}
return FALSE;
}
if (hash_info->state == FIRSTDATA)
hash_info->state = MOREDATA;
/* we must be receiving more data */
data_here = tvb_length_remaining(tvb, offset);
hash_info->seen += data_here;
if (hash_info->seen >= hash_info->length)
hash_info->state = DONE;
dsi_hash_insert(fd->num, hash_info->flags,
hash_info->command, hash_info->requestid,
hash_info->length,hash_info->seen);
return FALSE;
}
static void
dissect_dsi(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *dsi_tree;
proto_item *ti;
conversation_t *conversation;
hash_entry_t *hash_info;
gint offset = 0;
gboolean prev_cont; /* TRUE if a previously known
* continuation packet */
char cont_str[256];
gchar *flag_str;
gchar *func_str;
guint8 dsi_flags,dsi_command;
guint16 dsi_requestid;
guint32 dsi_code;
guint32 dsi_length;
guint32 dsi_reserved;
if (check_col(pinfo->fd, COL_PROTOCOL))
col_set_str(pinfo->fd, COL_PROTOCOL, "DSI");
if (check_col(pinfo->fd, COL_INFO))
col_clear(pinfo->fd, COL_INFO);
conversation = find_conversation(&pinfo->src, &pinfo->dst, PT_TCP,
pinfo->srcport, pinfo->destport, 0);
if (conversation == NULL) {
hash_info = g_mem_chunk_alloc(vals);
hash_info->state = NONE;
conversation = conversation_new(&pinfo->src, &pinfo->dst,
pinfo->ptype, pinfo->srcport, pinfo->destport,
hash_info, 0);
conversation_set_dissector(conversation, dissect_dsi);
}else
{
hash_info = conversation->data;
}
prev_cont=dsi_state_machine( hash_info, tvb, pinfo, offset);
if ((hash_info->state == NONE) && (prev_cont!=TRUE))
{
dsi_flags = tvb_get_guint8(tvb, offset);
dsi_command = tvb_get_guint8(tvb, offset+1);
dsi_requestid = tvb_get_ntohs(tvb, offset+2);
dsi_code = tvb_get_ntohl(tvb, offset+4);
dsi_length = tvb_get_ntohl(tvb, offset+8);
dsi_reserved = tvb_get_ntohl(tvb, offset+12);
}else
{
dsi_flags = hash_info->flags;
dsi_command = hash_info->command;
dsi_requestid = hash_info->requestid;
dsi_code = hash_info->code;
dsi_length = hash_info->length;
dsi_reserved = hash_info->reserved;
}
if (check_col(pinfo->fd, COL_INFO)) {
if ((func_str = match_strval(dsi_command, func_vals)))
{
flag_str = match_strval(dsi_flags, flag_vals);
if ((hash_info->state == MOREDATA) ||
(hash_info->state == DONE) ||
(prev_cont == TRUE))
{
sprintf(cont_str,"Continued: %d/%d",
hash_info->seen,hash_info->length);
}else
{
cont_str[0]=0;
}
col_add_fstr(pinfo->fd, COL_INFO, "%s %s (%d) %s",
flag_str,func_str,dsi_requestid,
cont_str);
}
}
if (tree)
{
ti = proto_tree_add_item(tree, proto_dsi, tvb, offset,
tvb_length_remaining(tvb, offset), FALSE);
dsi_tree = proto_item_add_subtree(ti, ett_dsi);
if (prev_cont == TRUE)
{
proto_tree_add_uint(dsi_tree, hf_dsi_requestid, tvb,
0, 0, dsi_requestid);
dissect_data(tvb, 0, pinfo, dsi_tree);
}else
{
proto_tree_add_uint(dsi_tree, hf_dsi_flags, tvb,
offset, 1, dsi_flags);
proto_tree_add_uint(dsi_tree, hf_dsi_command, tvb,
offset+1, 1, dsi_command);
proto_tree_add_uint(dsi_tree, hf_dsi_requestid, tvb,
offset+2, 2, dsi_requestid);
proto_tree_add_uint(dsi_tree, hf_dsi_code, tvb,
offset+4, 4, dsi_code);
proto_tree_add_uint_format(dsi_tree, hf_dsi_length, tvb,
offset+8, 4, dsi_length,
"Length: %d bytes", dsi_length);
proto_tree_add_uint(dsi_tree, hf_dsi_reserved, tvb,
offset+12, 4, dsi_reserved);
dissect_data(tvb, 16, pinfo, dsi_tree);
}
}
}
static void dsi_reinit( void){
last_abs_sec = 0;
last_abs_usec= 0;
highest_num = 0;
if (vals)
g_mem_chunk_destroy(vals);
if (dsi_request_hash)
g_hash_table_destroy(dsi_request_hash);
if (dsi_request_keys)
g_mem_chunk_destroy(dsi_request_keys);
if (dsi_request_records)
g_mem_chunk_destroy(dsi_request_records);
dsi_request_hash = g_hash_table_new(dsi_hash, dsi_equal);
dsi_request_keys = g_mem_chunk_new("dsi_request_keys",
sizeof(dsi_request_key),
dsi_packet_init_count * sizeof(dsi_request_key),
G_ALLOC_AND_FREE);
dsi_request_records = g_mem_chunk_new("dsi_request_records",
sizeof(dsi_request_val),
dsi_packet_init_count * sizeof(dsi_request_val),
G_ALLOC_AND_FREE);
vals = g_mem_chunk_new("dsi_vals", hash_val_length,
hash_init_count * hash_val_length,
G_ALLOC_AND_FREE);
}
void
proto_register_dsi(void)
{
static hf_register_info hf[] = {
{ &hf_dsi_flags,
{ "Flags", "dsi.flags",
FT_UINT8, BASE_HEX, VALS(flag_vals), 0x0,
"Indicates request or reply.", HFILL }},
{ &hf_dsi_command,
{ "Command", "dsi.command",
FT_UINT8, BASE_DEC, VALS(func_vals), 0x0,
"Represents a DSI command.", HFILL }},
{ &hf_dsi_requestid,
{ "Request ID", "dsi.requestid",
FT_UINT16, BASE_DEC, NULL, 0x0,
"Keeps track of which request this is. Replies must match a Request. IDs must be generated in sequential order.", HFILL }},
{ &hf_dsi_code,
{ "Code", "dsi.code",
FT_UINT32, BASE_HEX, NULL, 0x0,
"In Reply packets this is an error code. In Request Write packets this is a data offset.", HFILL }},
{ &hf_dsi_length,
{ "Length", "dsi.length",
FT_UINT32, BASE_DEC, NULL, 0x0,
"Total length of the data that follows the DSI header.", HFILL }},
{ &hf_dsi_reserved,
{ "Reserved", "dsi.reserved",
FT_UINT32, BASE_HEX, NULL, 0x0,
"Reserved for future use. Should be set to zero.", HFILL }},
};
static gint *ett[] = {
&ett_dsi,
};
proto_dsi = proto_register_protocol("Data Stream Interface", "DSI", "dsi");
proto_register_field_array(proto_dsi, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_init_routine( &dsi_reinit);
}
void
proto_reg_handoff_dsi(void)
{
dissector_add("tcp.port", TCP_PORT_DSI, dissect_dsi, proto_dsi);
}
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