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wireshark/epan/dissectors/packet-frame.c

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/* packet-frame.c
*
* Top-most dissector. Decides dissector based on Wiretap Encapsulation Type.
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 2000 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"
#ifdef _MSC_VER
#include <windows.h>
#endif
#include <glib.h>
#include <epan/packet.h>
#include <epan/timestamp.h>
#include "packet-frame.h"
#include <epan/prefs.h>
#include <epan/tap.h>
#include <epan/expert.h>
#include <epan/crypt/md5.h>
#include "color.h"
#include "color_filters.h"
int proto_frame = -1;
int proto_pkt_comment = -1;
int hf_frame_arrival_time = -1;
int hf_frame_shift_offset = -1;
int hf_frame_arrival_time_epoch = -1;
static int hf_frame_time_invalid = -1;
static int hf_frame_time_delta = -1;
static int hf_frame_time_delta_displayed = -1;
static int hf_frame_time_relative = -1;
static int hf_frame_time_reference = -1;
int hf_frame_number = -1;
int hf_frame_len = -1;
int hf_frame_capture_len = -1;
static int hf_frame_p2p_dir = -1;
static int hf_frame_file_off = -1;
static int hf_frame_md5_hash = -1;
static int hf_frame_marked = -1;
static int hf_frame_ignored = -1;
static int hf_link_number = -1;
static int hf_frame_protocols = -1;
static int hf_frame_color_filter_name = -1;
static int hf_frame_color_filter_text = -1;
static int hf_frame_interface_id = -1;
static int hf_frame_pack_flags = -1;
static int hf_frame_pack_direction = -1;
static int hf_frame_pack_reception_type = -1;
static int hf_frame_pack_fcs_length = -1;
static int hf_frame_pack_reserved = -1;
static int hf_frame_pack_crc_error = -1;
static int hf_frame_pack_wrong_packet_too_long_error = -1;
static int hf_frame_pack_wrong_packet_too_short_error = -1;
static int hf_frame_pack_wrong_inter_frame_gap_error = -1;
static int hf_frame_pack_unaligned_frame_error = -1;
static int hf_frame_pack_start_frame_delimiter_error = -1;
static int hf_frame_pack_preamble_error = -1;
static int hf_frame_pack_symbol_error = -1;
static int hf_frame_wtap_encap = -1;
static int hf_comments_text = -1;
static int proto_short = -1;
int proto_malformed = -1;
static int proto_unreassembled = -1;
static gint ett_frame = -1;
static gint ett_flags = -1;
static gint ett_comments = -1;
static int frame_tap = -1;
static dissector_handle_t data_handle;
static dissector_handle_t docsis_handle;
/* Preferences */
static gboolean show_file_off = FALSE;
static gboolean force_docsis_encap = FALSE;
static gboolean generate_md5_hash = FALSE;
static gboolean generate_epoch_time = TRUE;
static gboolean generate_bits_field = TRUE;
static const value_string p2p_dirs[] = {
{ P2P_DIR_UNKNOWN, "Unknown" },
{ P2P_DIR_SENT, "Sent" },
{ P2P_DIR_RECV, "Received" },
{ 0, NULL }
};
#define PACKET_WORD_DIRECTION_MASK 0x00000003
#define PACKET_WORD_RECEPTION_TYPE_MASK 0x0000001C
#define PACKET_WORD_FCS_LENGTH_MASK 0x000001E0
#define PACKET_WORD_RESERVED_MASK 0x0000FE00
#define PACKET_WORD_CRC_ERR_MASK 0x01000000
#define PACKET_WORD_PACKET_TOO_LONG_ERR_MASK 0x02000000
#define PACKET_WORD_PACKET_TOO_SHORT_ERR_MASK 0x04000000
#define PACKET_WORD_WRONG_INTER_FRAME_GAP_ERR_MASK 0x08000000
#define PACKET_WORD_UNALIGNED_FRAME_ERR_MASK 0x10000000
#define PACKET_WORD_START_FRAME_DELIMITER_ERR_MASK 0x20000000
#define PACKET_WORD_PREAMBLE_ERR_MASK 0x40000000
#define PACKET_WORD_SYMBOL_ERR_MASK 0x80000000
static const value_string packet_word_directions[] = {
{ 0x00, "Not available" },
{ 0x01, "Inbound" },
{ 0x02, "Outbound" },
{ 0x03, "Undefined" },
{ 0, NULL }
};
static const value_string packet_word_reception_types[] = {
{ 0x00, "Not specified" },
{ 0x01, "Unicast" },
{ 0x02, "Multicast" },
{ 0x03, "Broadcast" },
{ 0x04, "Promiscuous" },
{ 0x05, "Undefined" },
{ 0x06, "Undefined" },
{ 0x07, "Undefined" },
{ 0, NULL }
};
dissector_table_t wtap_encap_dissector_table;
/*
* Routine used to register frame end routine. The routine should only
* be registered when the dissector is used in the frame, not in the
* proto_register_XXX function.
*/
void
register_frame_end_routine(packet_info *pinfo, void (*func)(void))
{
pinfo->frame_end_routines = g_slist_append(pinfo->frame_end_routines, (gpointer)func);
}
typedef void (*void_func_t)(void);
static void
call_frame_end_routine(gpointer routine, gpointer dummy _U_)
{
void_func_t func = (void_func_t)routine;
(*func)();
}
static void
dissect_frame(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
{
proto_item *volatile ti = NULL, *comment_item;
guint cap_len = 0, frame_len = 0;
proto_tree *volatile tree;
proto_tree *comments_tree;
proto_item *item;
const gchar *cap_plurality, *frame_plurality;
tree=parent_tree;
pinfo->current_proto = "Frame";
if (pinfo->pseudo_header != NULL) {
switch (pinfo->fd->lnk_t) {
case WTAP_ENCAP_WFLEET_HDLC:
case WTAP_ENCAP_CHDLC_WITH_PHDR:
case WTAP_ENCAP_PPP_WITH_PHDR:
case WTAP_ENCAP_SDLC:
case WTAP_ENCAP_BLUETOOTH_H4_WITH_PHDR:
pinfo->p2p_dir = pinfo->pseudo_header->p2p.sent ?
P2P_DIR_SENT : P2P_DIR_RECV;
break;
case WTAP_ENCAP_BLUETOOTH_HCI:
pinfo->p2p_dir = pinfo->pseudo_header->bthci.sent;
break;
case WTAP_ENCAP_LAPB:
case WTAP_ENCAP_FRELAY_WITH_PHDR:
pinfo->p2p_dir =
(pinfo->pseudo_header->x25.flags & FROM_DCE) ?
P2P_DIR_RECV : P2P_DIR_SENT;
break;
case WTAP_ENCAP_ISDN:
case WTAP_ENCAP_V5_EF:
case WTAP_ENCAP_DPNSS:
case WTAP_ENCAP_BACNET_MS_TP_WITH_PHDR:
pinfo->p2p_dir = pinfo->pseudo_header->isdn.uton ?
P2P_DIR_SENT : P2P_DIR_RECV;
break;
case WTAP_ENCAP_LINUX_LAPD:
pinfo->p2p_dir = (pinfo->pseudo_header->lapd.pkttype == 3 ||
pinfo->pseudo_header->lapd.pkttype == 4) ?
P2P_DIR_SENT : P2P_DIR_RECV;
break;
case WTAP_ENCAP_MTP2_WITH_PHDR:
pinfo->p2p_dir = pinfo->pseudo_header->mtp2.sent ?
P2P_DIR_SENT : P2P_DIR_RECV;
pinfo->link_number = pinfo->pseudo_header->mtp2.link_number;
pinfo->annex_a_used = pinfo->pseudo_header->mtp2.annex_a_used;
break;
case WTAP_ENCAP_GSM_UM:
pinfo->p2p_dir = pinfo->pseudo_header->gsm_um.uplink ?
P2P_DIR_SENT : P2P_DIR_RECV;
break;
}
}
if(pinfo->fd->opt_comment){
item = proto_tree_add_item(tree, proto_pkt_comment, tvb, 0, -1, ENC_NA);
comments_tree = proto_item_add_subtree(item, ett_comments);
comment_item = proto_tree_add_string_format(comments_tree, hf_comments_text, tvb, 0, -1,
pinfo->fd->opt_comment, "%s",
pinfo->fd->opt_comment);
expert_add_info_format(pinfo, comment_item, PI_COMMENTS_GROUP, PI_COMMENT,
"%s", pinfo->fd->opt_comment);
}
/* if FRAME is not referenced from any filters we dont need to worry about
generating any tree items. */
if(!proto_field_is_referenced(tree, proto_frame)) {
tree=NULL;
if(pinfo->fd->flags.has_ts) {
if(pinfo->fd->abs_ts.nsecs < 0 || pinfo->fd->abs_ts.nsecs >= 1000000000)
expert_add_info_format(pinfo, NULL, PI_MALFORMED, PI_WARN,
"Arrival Time: Fractional second out of range (0-1000000000)");
}
} else {
proto_tree *fh_tree;
gboolean old_visible;
/* Put in frame header information. */
cap_len = tvb_length(tvb);
frame_len = tvb_reported_length(tvb);
cap_plurality = plurality(cap_len, "", "s");
frame_plurality = plurality(frame_len, "", "s");
ti = proto_tree_add_protocol_format(tree, proto_frame, tvb, 0, -1,
"Frame %u: %u byte%s on wire",
pinfo->fd->num, frame_len, frame_plurality);
if (generate_bits_field)
proto_item_append_text(ti, " (%u bits)", frame_len * 8);
proto_item_append_text(ti, ", %u byte%s captured",
cap_len, cap_plurality);
if (generate_bits_field) {
proto_item_append_text(ti, " (%u bits)",
cap_len * 8);
}
if (pinfo->fd->flags.has_if_id) {
proto_item_append_text(ti, " on interface %u",
pinfo->fd->interface_id);
}
if (pinfo->fd->flags.has_pack_flags) {
if (pinfo->fd->pack_flags & 0x00000001) {
proto_item_append_text(ti, " (inbound)");
pinfo->p2p_dir = P2P_DIR_RECV;
}
if (pinfo->fd->pack_flags & 0x00000002) {
proto_item_append_text(ti, " (outbound)");
pinfo->p2p_dir = P2P_DIR_SENT;
}
}
fh_tree = proto_item_add_subtree(ti, ett_frame);
if (pinfo->fd->flags.has_if_id)
proto_tree_add_uint(fh_tree, hf_frame_interface_id, tvb, 0, 0, pinfo->fd->interface_id);
if (pinfo->fd->flags.has_pack_flags) {
proto_tree *flags_tree;
proto_item *flags_item;
flags_item = proto_tree_add_uint(fh_tree, hf_frame_pack_flags, tvb, 0, 0, pinfo->fd->pack_flags);
flags_tree = proto_item_add_subtree(flags_item, ett_flags);
proto_tree_add_uint(flags_tree, hf_frame_pack_direction, tvb, 0, 0, pinfo->fd->pack_flags);
proto_tree_add_uint(flags_tree, hf_frame_pack_reception_type, tvb, 0, 0, pinfo->fd->pack_flags);
proto_tree_add_uint(flags_tree, hf_frame_pack_fcs_length, tvb, 0, 0, pinfo->fd->pack_flags);
proto_tree_add_uint(flags_tree, hf_frame_pack_reserved, tvb, 0, 0, pinfo->fd->pack_flags);
proto_tree_add_boolean(flags_tree, hf_frame_pack_crc_error, tvb, 0, 0, pinfo->fd->pack_flags);
proto_tree_add_boolean(flags_tree, hf_frame_pack_wrong_packet_too_long_error, tvb, 0, 0, pinfo->fd->pack_flags);
proto_tree_add_boolean(flags_tree, hf_frame_pack_wrong_packet_too_short_error, tvb, 0, 0, pinfo->fd->pack_flags);
proto_tree_add_boolean(flags_tree, hf_frame_pack_wrong_inter_frame_gap_error, tvb, 0, 0, pinfo->fd->pack_flags);
proto_tree_add_boolean(flags_tree, hf_frame_pack_unaligned_frame_error, tvb, 0, 0, pinfo->fd->pack_flags);
proto_tree_add_boolean(flags_tree, hf_frame_pack_start_frame_delimiter_error, tvb, 0, 0, pinfo->fd->pack_flags);
proto_tree_add_boolean(flags_tree, hf_frame_pack_preamble_error, tvb, 0, 0, pinfo->fd->pack_flags);
proto_tree_add_boolean(flags_tree, hf_frame_pack_symbol_error, tvb, 0, 0, pinfo->fd->pack_flags);
}
proto_tree_add_int(fh_tree, hf_frame_wtap_encap, tvb, 0, 0, pinfo->fd->lnk_t);
if (pinfo->fd->flags.has_ts) {
proto_tree_add_time(fh_tree, hf_frame_arrival_time, tvb,
0, 0, &(pinfo->fd->abs_ts));
if(pinfo->fd->abs_ts.nsecs < 0 || pinfo->fd->abs_ts.nsecs >= 1000000000) {
item = proto_tree_add_none_format(fh_tree, hf_frame_time_invalid, tvb, 0, 0,
"Arrival Time: Fractional second %09ld is invalid,"
" the valid range is 0-1000000000",
(long) pinfo->fd->abs_ts.nsecs);
PROTO_ITEM_SET_GENERATED(item);
expert_add_info_format(pinfo, item, PI_MALFORMED, PI_WARN,
"Arrival Time: Fractional second out of range (0-1000000000)");
}
item = proto_tree_add_time(fh_tree, hf_frame_shift_offset, tvb,
0, 0, &(pinfo->fd->shift_offset));
PROTO_ITEM_SET_GENERATED(item);
if(generate_epoch_time) {
proto_tree_add_time(fh_tree, hf_frame_arrival_time_epoch, tvb,
0, 0, &(pinfo->fd->abs_ts));
}
if (proto_field_is_referenced(tree, hf_frame_time_delta)) {
nstime_t del_cap_ts;
frame_delta_abs_time(pinfo->fd, pinfo->fd->prev_cap, &del_cap_ts);
item = proto_tree_add_time(fh_tree, hf_frame_time_delta, tvb,
0, 0, &(del_cap_ts));
PROTO_ITEM_SET_GENERATED(item);
}
if (proto_field_is_referenced(tree, hf_frame_time_delta_displayed)) {
nstime_t del_dis_ts;
frame_delta_abs_time(pinfo->fd, pinfo->fd->prev_dis, &del_dis_ts);
item = proto_tree_add_time(fh_tree, hf_frame_time_delta_displayed, tvb,
0, 0, &(del_dis_ts));
PROTO_ITEM_SET_GENERATED(item);
}
item = proto_tree_add_time(fh_tree, hf_frame_time_relative, tvb,
0, 0, &(pinfo->fd->rel_ts));
PROTO_ITEM_SET_GENERATED(item);
if(pinfo->fd->flags.ref_time){
ti = proto_tree_add_item(fh_tree, hf_frame_time_reference, tvb, 0, 0, ENC_NA);
PROTO_ITEM_SET_GENERATED(ti);
}
}
proto_tree_add_uint(fh_tree, hf_frame_number, tvb,
0, 0, pinfo->fd->num);
proto_tree_add_uint_format(fh_tree, hf_frame_len, tvb,
0, 0, frame_len, "Frame Length: %u byte%s (%u bits)",
frame_len, frame_plurality, frame_len * 8);
proto_tree_add_uint_format(fh_tree, hf_frame_capture_len, tvb,
0, 0, cap_len, "Capture Length: %u byte%s (%u bits)",
cap_len, cap_plurality, cap_len * 8);
if (generate_md5_hash) {
const guint8 *cp;
md5_state_t md_ctx;
md5_byte_t digest[16];
const gchar *digest_string;
cp = tvb_get_ptr(tvb, 0, cap_len);
md5_init(&md_ctx);
md5_append(&md_ctx, cp, cap_len);
md5_finish(&md_ctx, digest);
digest_string = bytestring_to_str(digest, 16, '\0');
ti = proto_tree_add_string(fh_tree, hf_frame_md5_hash, tvb, 0, 0, digest_string);
PROTO_ITEM_SET_GENERATED(ti);
}
ti = proto_tree_add_boolean(fh_tree, hf_frame_marked, tvb, 0, 0,pinfo->fd->flags.marked);
PROTO_ITEM_SET_GENERATED(ti);
ti = proto_tree_add_boolean(fh_tree, hf_frame_ignored, tvb, 0, 0,pinfo->fd->flags.ignored);
PROTO_ITEM_SET_GENERATED(ti);
if(proto_field_is_referenced(tree, hf_frame_protocols)) {
/* we are going to be using proto_item_append_string() on
* hf_frame_protocols, and we must therefore disable the
* TRY_TO_FAKE_THIS_ITEM() optimisation for the tree by
* setting it as visible.
*
* See proto.h for details.
*/
old_visible = proto_tree_set_visible(fh_tree, TRUE);
ti = proto_tree_add_string(fh_tree, hf_frame_protocols, tvb, 0, 0, "");
PROTO_ITEM_SET_GENERATED(ti);
proto_tree_set_visible(fh_tree, old_visible);
pinfo->layer_names = g_string_new("");
}
else
pinfo->layer_names = NULL;
/* Check for existences of P2P pseudo header */
if (pinfo->p2p_dir != P2P_DIR_UNKNOWN) {
proto_tree_add_int(fh_tree, hf_frame_p2p_dir, tvb,
0, 0, pinfo->p2p_dir);
}
/* Check for existences of MTP2 link number */
if ((pinfo->pseudo_header != NULL ) && (pinfo->fd->lnk_t == WTAP_ENCAP_MTP2_WITH_PHDR)) {
proto_tree_add_uint(fh_tree, hf_link_number, tvb,
0, 0, pinfo->link_number);
}
if (show_file_off) {
proto_tree_add_int64_format(fh_tree, hf_frame_file_off, tvb,
0, 0, pinfo->fd->file_off,
"File Offset: %" G_GINT64_MODIFIER "d (0x%" G_GINT64_MODIFIER "x)",
pinfo->fd->file_off, pinfo->fd->file_off);
}
if(pinfo->fd->color_filter != NULL) {
const color_filter_t *color_filter = pinfo->fd->color_filter;
item = proto_tree_add_string(fh_tree, hf_frame_color_filter_name, tvb,
0, 0, color_filter->filter_name);
PROTO_ITEM_SET_GENERATED(item);
item = proto_tree_add_string(fh_tree, hf_frame_color_filter_text, tvb,
0, 0, color_filter->filter_text);
PROTO_ITEM_SET_GENERATED(item);
}
}
if (pinfo->fd->flags.ignored) {
/* Ignored package, stop handling here */
col_set_str(pinfo->cinfo, COL_INFO, "<Ignored>");
proto_tree_add_text (tree, tvb, 0, -1, "This frame is marked as ignored");
return;
}
/* Portable Exception Handling to trap Wireshark specific exceptions like BoundsError exceptions */
TRY {
#ifdef _MSC_VER
/* Win32: Visual-C Structured Exception Handling (SEH) to trap hardware exceptions
like memory access violations.
(a running debugger will be called before the except part below) */
/* Note: A Windows "exceptional exception" may leave the kazlib's (Portable Exception Handling)
stack in an inconsistent state thus causing a crash at some point in the
handling of the exception.
See: https://www.wireshark.org/lists/wireshark-dev/200704/msg00243.html
*/
__try {
#endif
if ((force_docsis_encap) && (docsis_handle)) {
call_dissector(docsis_handle, tvb, pinfo, parent_tree);
} else {
if (!dissector_try_uint(wtap_encap_dissector_table, pinfo->fd->lnk_t,
tvb, pinfo, parent_tree)) {
col_set_str(pinfo->cinfo, COL_PROTOCOL, "UNKNOWN");
col_add_fstr(pinfo->cinfo, COL_INFO, "WTAP_ENCAP = %d",
pinfo->fd->lnk_t);
call_dissector(data_handle,tvb, pinfo, parent_tree);
}
}
#ifdef _MSC_VER
} __except(EXCEPTION_EXECUTE_HANDLER /* handle all exceptions */) {
switch(GetExceptionCode()) {
case(STATUS_ACCESS_VIOLATION):
show_exception(tvb, pinfo, parent_tree, DissectorError,
"STATUS_ACCESS_VIOLATION: dissector accessed an invalid memory address");
break;
case(STATUS_INTEGER_DIVIDE_BY_ZERO):
show_exception(tvb, pinfo, parent_tree, DissectorError,
"STATUS_INTEGER_DIVIDE_BY_ZERO: dissector tried an integer division by zero");
break;
case(STATUS_STACK_OVERFLOW):
show_exception(tvb, pinfo, parent_tree, DissectorError,
"STATUS_STACK_OVERFLOW: dissector overflowed the stack (e.g. endless loop)");
/* XXX - this will have probably corrupted the stack,
which makes problems later in the exception code */
break;
/* XXX - add other hardware exception codes as required */
default:
show_exception(tvb, pinfo, parent_tree, DissectorError,
g_strdup_printf("dissector caused an unknown exception: 0x%x", GetExceptionCode()));
}
}
#endif
}
CATCH(OutOfMemoryError) {
RETHROW;
}
CATCH_ALL {
show_exception(tvb, pinfo, parent_tree, EXCEPT_CODE, GET_MESSAGE);
}
ENDTRY;
if (tree && pinfo->layer_names) {
proto_item_append_string(ti, pinfo->layer_names->str);
g_string_free(pinfo->layer_names, TRUE);
pinfo->layer_names = NULL;
}
/* Call postdissectors if we have any (while trying to avoid another
* TRY/CATCH)
*/
if (have_postdissector()) {
TRY {
#ifdef _MSC_VER
/* Win32: Visual-C Structured Exception Handling (SEH)
to trap hardware exceptions like memory access violations */
/* (a running debugger will be called before the except part below) */
/* Note: A Windows "exceptional exception" may leave the kazlib's (Portable Exception Handling)
stack in an inconsistent state thus causing a crash at some point in the
handling of the exception.
See: https://www.wireshark.org/lists/wireshark-dev/200704/msg00243.html
*/
__try {
#endif
call_all_postdissectors(tvb, pinfo, parent_tree);
#ifdef _MSC_VER
} __except(EXCEPTION_EXECUTE_HANDLER /* handle all exceptions */) {
switch(GetExceptionCode()) {
case(STATUS_ACCESS_VIOLATION):
show_exception(tvb, pinfo, parent_tree, DissectorError,
"STATUS_ACCESS_VIOLATION: dissector accessed an invalid memory address");
break;
case(STATUS_INTEGER_DIVIDE_BY_ZERO):
show_exception(tvb, pinfo, parent_tree, DissectorError,
"STATUS_INTEGER_DIVIDE_BY_ZERO: dissector tried an integer division by zero");
break;
case(STATUS_STACK_OVERFLOW):
show_exception(tvb, pinfo, parent_tree, DissectorError,
"STATUS_STACK_OVERFLOW: dissector overflowed the stack (e.g. endless loop)");
/* XXX - this will have probably corrupted the stack,
which makes problems later in the exception code */
break;
/* XXX - add other hardware exception codes as required */
default:
show_exception(tvb, pinfo, parent_tree, DissectorError,
g_strdup_printf("dissector caused an unknown exception: 0x%x", GetExceptionCode()));
}
}
#endif
}
CATCH(OutOfMemoryError) {
RETHROW;
}
CATCH_ALL {
show_exception(tvb, pinfo, parent_tree, EXCEPT_CODE, GET_MESSAGE);
}
ENDTRY;
}
tap_queue_packet(frame_tap, pinfo, NULL);
if (pinfo->frame_end_routines) {
g_slist_foreach(pinfo->frame_end_routines, &call_frame_end_routine, NULL);
g_slist_free(pinfo->frame_end_routines);
pinfo->frame_end_routines = NULL;
}
}
void
show_exception(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
unsigned long exception, const char *exception_message)
{
static const char dissector_error_nomsg[] =
"Dissector writer didn't bother saying what the error was";
proto_item *item;
switch (exception) {
case ScsiBoundsError:
col_append_str(pinfo->cinfo, COL_INFO, "[SCSI transfer limited due to allocation_length too small]");
/*item =*/ proto_tree_add_protocol_format(tree, proto_short, tvb, 0, 0,
"SCSI transfer limited due to allocation_length too small: %s truncated]", pinfo->current_proto);
/* Don't record ScsiBoundsError exceptions as expert events - they merely
* reflect a normal SCSI condition.
* (any case where it's caused by something else is a bug). */
/* expert_add_info_format(pinfo, item, PI_MALFORMED, PI_ERROR, "Packet size limited");*/
break;
case BoundsError:
col_append_str(pinfo->cinfo, COL_INFO, "[Packet size limited during capture]");
/*item =*/ proto_tree_add_protocol_format(tree, proto_short, tvb, 0, 0,
"[Packet size limited during capture: %s truncated]", pinfo->current_proto);
/* Don't record BoundsError exceptions as expert events - they merely
* reflect a capture done with a snapshot length too short to capture
* all of the packet
* (any case where it's caused by something else is a bug). */
/* expert_add_info_format(pinfo, item, PI_MALFORMED, PI_ERROR, "Packet size limited");*/
break;
case ReportedBoundsError:
show_reported_bounds_error(tvb, pinfo, tree);
break;
case DissectorError:
col_append_fstr(pinfo->cinfo, COL_INFO,
"[Dissector bug, protocol %s: %s]",
pinfo->current_proto,
exception_message == NULL ?
dissector_error_nomsg : exception_message);
item = proto_tree_add_protocol_format(tree, proto_malformed, tvb, 0, 0,
"[Dissector bug, protocol %s: %s]",
pinfo->current_proto,
exception_message == NULL ?
dissector_error_nomsg : exception_message);
g_warning("Dissector bug, protocol %s, in packet %u: %s",
pinfo->current_proto, pinfo->fd->num,
exception_message == NULL ?
dissector_error_nomsg : exception_message);
expert_add_info_format(pinfo, item, PI_MALFORMED, PI_ERROR,
"%s",
exception_message == NULL ?
dissector_error_nomsg : exception_message);
break;
default:
/* XXX - we want to know, if an unknown exception passed until here, don't we? */
g_assert_not_reached();
}
}
void
show_reported_bounds_error(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *item;
if (pinfo->fragmented) {
/*
* We were dissecting an unreassembled fragmented
* packet when the exception was thrown, so the
* problem isn't that the dissector expected
* something but it wasn't in the packet, the
* problem is that the dissector expected something
* but it wasn't in the fragment we dissected.
*/
col_append_fstr(pinfo->cinfo, COL_INFO,
"[Unreassembled Packet%s] ",
pinfo->noreassembly_reason);
item = proto_tree_add_protocol_format(tree, proto_unreassembled,
tvb, 0, 0, "[Unreassembled Packet%s: %s]",
pinfo->noreassembly_reason, pinfo->current_proto);
expert_add_info_format(pinfo, item, PI_REASSEMBLE, PI_WARN, "Unreassembled Packet (Exception occurred)");
} else {
col_append_str(pinfo->cinfo, COL_INFO,
"[Malformed Packet]");
item = proto_tree_add_protocol_format(tree, proto_malformed,
tvb, 0, 0, "[Malformed Packet: %s]", pinfo->current_proto);
expert_add_info_format(pinfo, item, PI_MALFORMED, PI_ERROR, "Malformed Packet (Exception occurred)");
}
}
void
proto_register_frame(void)
{
static hf_register_info hf[] = {
{ &hf_frame_arrival_time,
{ "Arrival Time", "frame.time",
FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x0,
"Absolute time when this frame was captured", HFILL }},
{ &hf_frame_shift_offset,
{ "Time shift for this packet", "frame.offset_shift",
FT_RELATIVE_TIME, BASE_NONE, NULL, 0x0,
"Time shift applied to this packet", HFILL }},
{ &hf_frame_arrival_time_epoch,
{ "Epoch Time", "frame.time_epoch",
FT_RELATIVE_TIME, BASE_NONE, NULL, 0x0,
"Epoch time when this frame was captured", HFILL }},
{ &hf_frame_time_invalid,
{ "Arrival Timestamp invalid", "frame.time_invalid",
FT_NONE, BASE_NONE, NULL, 0x0,
"The timestamp from the capture is out of the valid range", HFILL }},
{ &hf_frame_time_delta,
{ "Time delta from previous captured frame", "frame.time_delta",
FT_RELATIVE_TIME, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_frame_time_delta_displayed,
{ "Time delta from previous displayed frame", "frame.time_delta_displayed",
FT_RELATIVE_TIME, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_frame_time_relative,
{ "Time since reference or first frame", "frame.time_relative",
FT_RELATIVE_TIME, BASE_NONE, NULL, 0x0,
"Time relative to time reference or first frame", HFILL }},
{ &hf_frame_time_reference,
{ "This is a Time Reference frame", "frame.ref_time",
FT_NONE, BASE_NONE, NULL, 0x0,
"This frame is a Time Reference frame", HFILL }},
{ &hf_frame_number,
{ "Frame Number", "frame.number",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_frame_len,
{ "Frame length on the wire", "frame.len",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_frame_capture_len,
{ "Frame length stored into the capture file", "frame.cap_len",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_frame_md5_hash,
{ "Frame MD5 Hash", "frame.md5_hash",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_frame_p2p_dir,
{ "Point-to-Point Direction", "frame.p2p_dir",
FT_INT8, BASE_DEC, VALS(p2p_dirs), 0x0,
NULL, HFILL }},
{ &hf_link_number,
{ "Link Number", "frame.link_nr",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_frame_file_off,
{ "File Offset", "frame.file_off",
FT_INT64, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_frame_marked,
{ "Frame is marked", "frame.marked",
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
"Frame is marked in the GUI", HFILL }},
{ &hf_frame_ignored,
{ "Frame is ignored", "frame.ignored",
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
"Frame is ignored by the dissectors", HFILL }},
{ &hf_frame_protocols,
{ "Protocols in frame", "frame.protocols",
FT_STRING, BASE_NONE, NULL, 0x0,
"Protocols carried by this frame", HFILL }},
{ &hf_frame_color_filter_name,
{ "Coloring Rule Name", "frame.coloring_rule.name",
FT_STRING, BASE_NONE, NULL, 0x0,
"The frame matched the coloring rule with this name", HFILL }},
{ &hf_frame_color_filter_text,
{ "Coloring Rule String", "frame.coloring_rule.string",
FT_STRING, BASE_NONE, NULL, 0x0,
"The frame matched this coloring rule string", HFILL }},
{ &hf_frame_interface_id,
{ "Interface id", "frame.interface_id",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_frame_pack_flags,
{ "Packet flags", "frame.packet_flags",
FT_UINT32, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_frame_pack_direction,
{ "Direction", "frame.packet_flags_direction",
FT_UINT32, BASE_HEX, VALS(&packet_word_directions), PACKET_WORD_DIRECTION_MASK,
NULL, HFILL }},
{ &hf_frame_pack_reception_type,
{ "Reception type", "frame.packet_flags_reception_type",
FT_UINT32, BASE_DEC, VALS(&packet_word_reception_types), PACKET_WORD_RECEPTION_TYPE_MASK,
NULL, HFILL }},
{ &hf_frame_pack_fcs_length,
{ "FCS length", "frame.packet_flags_fcs_length",
FT_UINT32, BASE_DEC, NULL, PACKET_WORD_FCS_LENGTH_MASK,
NULL, HFILL }},
{ &hf_frame_pack_reserved,
{ "Reserved", "frame.packet_flags_reserved",
FT_UINT32, BASE_DEC, NULL, PACKET_WORD_RESERVED_MASK,
NULL, HFILL }},
{ &hf_frame_pack_crc_error,
{ "CRC error", "frame.packet_flags_crc_error",
FT_BOOLEAN, 32, TFS(&tfs_set_notset), PACKET_WORD_CRC_ERR_MASK,
NULL, HFILL }},
{ &hf_frame_pack_wrong_packet_too_long_error,
{ "Packet too long error", "frame.packet_flags_packet_too_error",
FT_BOOLEAN, 32, TFS(&tfs_set_notset), PACKET_WORD_PACKET_TOO_LONG_ERR_MASK,
NULL, HFILL }},
{ &hf_frame_pack_wrong_packet_too_short_error,
{ "Packet too short error", "frame.packet_flags_packet_too_short_error",
FT_BOOLEAN, 32, TFS(&tfs_set_notset), PACKET_WORD_PACKET_TOO_SHORT_ERR_MASK,
NULL, HFILL }},
{ &hf_frame_pack_wrong_inter_frame_gap_error,
{ "Wrong interframe gap error", "frame.packet_flags_wrong_inter_frame_gap_error",
FT_BOOLEAN, 32, TFS(&tfs_set_notset), PACKET_WORD_WRONG_INTER_FRAME_GAP_ERR_MASK,
NULL, HFILL }},
{ &hf_frame_pack_unaligned_frame_error,
{ "Unaligned frame error", "frame.packet_flags_unaligned_frame_error",
FT_BOOLEAN, 32, TFS(&tfs_set_notset), PACKET_WORD_UNALIGNED_FRAME_ERR_MASK,
NULL, HFILL }},
{ &hf_frame_pack_start_frame_delimiter_error,
{ "Start frame delimiter error", "frame.packet_flags_start_frame_delimiter_error",
FT_BOOLEAN, 32, TFS(&tfs_set_notset), PACKET_WORD_START_FRAME_DELIMITER_ERR_MASK,
NULL, HFILL }},
{ &hf_frame_pack_preamble_error,
{ "Preamble error", "frame.packet_flags_preamble_error",
FT_BOOLEAN, 32, TFS(&tfs_set_notset), PACKET_WORD_PREAMBLE_ERR_MASK,
NULL, HFILL }},
{ &hf_frame_pack_symbol_error,
{ "Symbol error", "frame.packet_flags_symbol_error",
FT_BOOLEAN, 32, TFS(&tfs_set_notset), PACKET_WORD_SYMBOL_ERR_MASK,
NULL, HFILL }},
{ &hf_comments_text,
{ "Comment", "frame.comment",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
};
static hf_register_info hf_encap =
{ &hf_frame_wtap_encap,
{ "Encapsulation type", "frame.encap_type",
FT_INT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }};
static gint *ett[] = {
&ett_frame,
&ett_flags,
&ett_comments
};
module_t *frame_module;
if (hf_encap.hfinfo.strings == NULL) {
int encap_count = wtap_get_num_encap_types();
value_string *arr;
int i;
hf_encap.hfinfo.strings = arr = g_new(value_string, encap_count+1);
for (i = 0; i < encap_count; i++) {
arr[i].value = i;
arr[i].strptr = wtap_encap_string(i);
}
arr[encap_count].value = 0;
arr[encap_count].strptr = NULL;
}
wtap_encap_dissector_table = register_dissector_table("wtap_encap",
"Wiretap encapsulation type", FT_UINT32, BASE_DEC);
proto_frame = proto_register_protocol("Frame", "Frame", "frame");
proto_pkt_comment = proto_register_protocol("Packet comments", "Pkt_Comment", "pkt_comment");
proto_register_field_array(proto_frame, hf, array_length(hf));
proto_register_field_array(proto_frame, &hf_encap, 1);
proto_register_subtree_array(ett, array_length(ett));
register_dissector("frame",dissect_frame,proto_frame);
/* You can't disable dissection of "Frame", as that would be
tantamount to not doing any dissection whatsoever. */
proto_set_cant_toggle(proto_frame);
proto_short = proto_register_protocol("Short Frame", "Short frame", "short");
proto_malformed = proto_register_protocol("Malformed Packet",
"Malformed packet", "malformed");
proto_unreassembled = proto_register_protocol(
"Unreassembled Fragmented Packet",
"Unreassembled fragmented packet", "unreassembled");
/* "Short Frame", "Malformed Packet", and "Unreassembled Fragmented
Packet" aren't really protocols, they're error indications;
disabling them makes no sense. */
proto_set_cant_toggle(proto_short);
proto_set_cant_toggle(proto_malformed);
proto_set_cant_toggle(proto_unreassembled);
/* Our preferences */
frame_module = prefs_register_protocol(proto_frame, NULL);
prefs_register_bool_preference(frame_module, "show_file_off",
"Show File Offset", "Show offset of frame in capture file", &show_file_off);
prefs_register_bool_preference(frame_module, "force_docsis_encap",
"Treat all frames as DOCSIS frames", "Treat all frames as DOCSIS Frames", &force_docsis_encap);
prefs_register_bool_preference(frame_module, "generate_md5_hash",
"Generate an MD5 hash of each frame",
"Whether or not MD5 hashes should be generated for each frame, useful for finding duplicate frames.",
&generate_md5_hash);
prefs_register_bool_preference(frame_module, "generate_epoch_time",
"Generate an epoch time entry for each frame",
"Whether or not an Epoch time entry should be generated for each frame.",
&generate_epoch_time);
prefs_register_bool_preference(frame_module, "generate_bits_field",
"Show the number of bits in the frame",
"Whether or not the number of bits in the frame should be shown.",
&generate_bits_field);
frame_tap=register_tap("frame");
}
void
proto_reg_handoff_frame(void)
{
data_handle = find_dissector("data");
docsis_handle = find_dissector("docsis");
}
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