2000-05-11 08:18:09 +00:00
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/* tvbuff.c
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*
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* Testy, Virtual(-izable) Buffer of guint8*'s
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*
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* "Testy" -- the buffer gets mad when an attempt to access data
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* beyond the bounds of the buffer. An exception is thrown.
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*
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* "Virtual" -- the buffer can have its own data, can use a subset of
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* the data of a backing tvbuff, or can be a composite of
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* other tvbuffs.
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*
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2001-07-02 07:11:40 +00:00
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* $Id: tvbuff.c,v 1.18 2001/07/02 07:11:40 guy Exp $
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2000-05-11 08:18:09 +00:00
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*
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* Copyright (c) 2000 by Gilbert Ramirez <gram@xiexie.org>
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*
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* Ethereal - Network traffic analyzer
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2001-05-27 21:34:05 +00:00
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* By Gerald Combs <gerald@ethereal.com>
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2000-05-11 08:18:09 +00:00
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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2000-09-11 20:05:13 +00:00
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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2000-05-11 08:18:09 +00:00
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#include <string.h>
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2000-08-30 02:50:18 +00:00
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#include "pint.h"
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#include "tvbuff.h"
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2000-09-11 16:16:13 +00:00
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#include "strutil.h"
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2000-05-11 08:18:09 +00:00
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typedef struct {
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/* The backing tvbuff_t */
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tvbuff_t *tvb;
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/* The offset/length of 'tvb' to which I'm privy */
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guint offset;
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guint length;
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} tvb_backing_t;
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typedef struct {
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GSList *tvbs;
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/* Used for quick testing to see if this
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* is the tvbuff that a COMPOSITE is
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* interested in. */
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guint *start_offsets;
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guint *end_offsets;
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} tvb_comp_t;
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struct tvbuff {
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/* Record-keeping */
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tvbuff_type type;
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gboolean initialized;
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guint usage_count;
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2001-03-23 14:44:04 +00:00
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gchar* ds_name; /* data source name */
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2000-05-11 08:18:09 +00:00
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/* The tvbuffs in which this tvbuff is a member
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* (that is, a backing tvbuff for a TVBUFF_SUBSET
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* or a member for a TVB_COMPOSITE) */
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GSList *used_in;
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/* TVBUFF_SUBSET and TVBUFF_COMPOSITE keep track
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* of the other tvbuff's they use */
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union {
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tvb_backing_t subset;
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tvb_comp_t composite;
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} tvbuffs;
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/* We're either a TVBUFF_REAL_DATA or a
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* TVBUFF_SUBSET that has a backing buffer that
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* has real_data != NULL, or a TVBUFF_COMPOSITE
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* which has flattened its data due to a call
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* to tvb_get_ptr().
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*/
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guint8 *real_data;
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/* Length of virtual buffer (and/or real_data). */
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guint length;
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2000-05-16 04:44:14 +00:00
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/* Reported length. */
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Add "tvb_reported_length()" to get the "reported length" of a tvbuff
(i.e., the amount of data that was in the packet, even if not all of it
was captured), for use when dissecting packets containing data that
fills the packet (we want the dissector to try to dissect all of it; if
it runs past the end of the captured data, we want it to throw an
exception so that we'll put a "Short Frame" note in the protocol tree).
This means we always want a tvbuff to have a real reported length value,
so we make it an unsigned integer, and don't bother checking it for -1,
as it should never be -1.
If the reported length passed in to "tvb_set_subset()" is -1, set the
reported length to the reported length of the tvbuff of which the new
tvbuff will be a subset minus the offset in that tvbuff of the subset,
so that "-1" means "what's left of the packet after we chop off the
header". This is necessary in order to ensure that all tvbuffs have a
real reported length value.
Have "dissect_packet()" set the reported length of the top-level tvbuff
to the reported length of the frame, so that we start out with a tvbuff
with a real reported length value.
Have "tvb_offset_exists()" return FALSE if the offset is past the end of
the tvbuff.
If the offset passed to it is postitive, have "compute_offset_length()"
check for that it's not more than one byte past the end of the tvbuff -
if it's just past the end, we don't want the check to fail, as we don't
want attempts to create a subset tvbuff containing zero bytes to fail;
that would be done if a captured packet was all header and no payload,
and we'd want the dissector of the payload, not the dissector of the
header, to throw an exception, as the problem isn't with the protocol
for the header, it's with the protocol for the payload.
Convert the ATM dissector, the SSCOP dissector, the Q.2931 dissector,
and the Q.931 dissector to use tvbuffs.
Make the LAPD dissector set up a tvbuff for the Q.931 dissector (it's
not converted yet).
svn path=/trunk/; revision=2023
2000-05-29 08:57:42 +00:00
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guint reported_length;
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2000-05-16 04:44:14 +00:00
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2000-05-11 08:18:09 +00:00
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/* Offset from beginning of first TVBUFF_REAL. */
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gint raw_offset;
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/* Func to call when actually freed */
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tvbuff_free_cb_t free_cb;
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};
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static guint8*
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ensure_contiguous(tvbuff_t *tvb, gint offset, gint length);
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/* We dole out tvbuff's from this memchunk. */
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GMemChunk *tvbuff_mem_chunk = NULL;
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void
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tvbuff_init(void)
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{
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if (!tvbuff_mem_chunk)
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tvbuff_mem_chunk = g_mem_chunk_create(tvbuff_t, 20, G_ALLOC_AND_FREE);
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}
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void
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tvbuff_cleanup(void)
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{
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if (tvbuff_mem_chunk)
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g_mem_chunk_destroy(tvbuff_mem_chunk);
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tvbuff_mem_chunk = NULL;
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}
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static void
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tvb_init(tvbuff_t *tvb, tvbuff_type type)
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{
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tvb_backing_t *backing;
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tvb_comp_t *composite;
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tvb->type = type;
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tvb->initialized = FALSE;
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tvb->usage_count = 1;
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tvb->length = 0;
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2000-05-16 04:44:14 +00:00
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tvb->reported_length = 0;
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2000-05-11 08:18:09 +00:00
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tvb->free_cb = NULL;
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tvb->real_data = NULL;
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tvb->raw_offset = -1;
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tvb->used_in = NULL;
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switch(type) {
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case TVBUFF_REAL_DATA:
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/* Nothing */
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break;
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case TVBUFF_SUBSET:
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backing = &tvb->tvbuffs.subset;
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backing->tvb = NULL;
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backing->offset = 0;
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backing->length = 0;
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break;
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case TVBUFF_COMPOSITE:
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composite = &tvb->tvbuffs.composite;
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composite->tvbs = NULL;
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composite->start_offsets = NULL;
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composite->end_offsets = NULL;
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break;
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}
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}
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tvbuff_t*
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tvb_new(tvbuff_type type)
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{
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tvbuff_t *tvb;
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tvb = g_chunk_new(tvbuff_t, tvbuff_mem_chunk);
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g_assert(tvb);
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tvb_init(tvb, type);
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return tvb;
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}
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2000-09-13 20:30:06 +00:00
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/* We accept a void* instead of a field_info* to satisfy CLEANUP_POP */
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static void
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tvb_free_void(void *tvb)
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{
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tvb_free((tvbuff_t*)tvb);
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}
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2000-05-11 08:18:09 +00:00
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void
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tvb_free(tvbuff_t* tvb)
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{
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tvbuff_t *member_tvb;
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tvb_comp_t *composite;
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GSList *slist;
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tvb->usage_count--;
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if (tvb->usage_count == 0) {
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switch (tvb->type) {
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case TVBUFF_REAL_DATA:
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if (tvb->free_cb) {
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tvb->free_cb(tvb->real_data);
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}
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break;
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case TVBUFF_SUBSET:
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2000-09-14 16:04:28 +00:00
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/* This will be NULL if tvb_new_subset() fails because
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* reported_length < -1 */
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if (tvb->tvbuffs.subset.tvb) {
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tvb_decrement_usage_count(tvb->tvbuffs.subset.tvb, 1);
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}
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2000-05-11 08:18:09 +00:00
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break;
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case TVBUFF_COMPOSITE:
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composite = &tvb->tvbuffs.composite;
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for (slist = composite->tvbs; slist != NULL ; slist = slist->next) {
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member_tvb = slist->data;
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tvb_decrement_usage_count(member_tvb, 1);
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}
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g_slist_free(composite->tvbs);
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if (composite->start_offsets)
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g_free(composite->start_offsets);
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if (composite->end_offsets)
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g_free(composite->end_offsets);
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if (tvb->real_data)
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g_free(tvb->real_data);
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break;
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}
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if (tvb->used_in) {
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g_slist_free(tvb->used_in);
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}
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g_chunk_free(tvb, tvbuff_mem_chunk);
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}
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}
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guint
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tvb_increment_usage_count(tvbuff_t* tvb, guint count)
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{
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tvb->usage_count += count;
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return tvb->usage_count;
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}
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guint
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tvb_decrement_usage_count(tvbuff_t* tvb, guint count)
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{
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if (tvb->usage_count <= count) {
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tvb->usage_count = 1;
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tvb_free(tvb);
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return 0;
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}
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else {
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tvb->usage_count -= count;
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return tvb->usage_count;
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}
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}
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void
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tvb_free_chain(tvbuff_t* tvb)
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{
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GSList *slist;
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/* Recursively call tvb_free_chain() */
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for (slist = tvb->used_in; slist != NULL ; slist = slist->next) {
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tvb_free_chain( (tvbuff_t*)slist->data );
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}
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/* Stop the recursion */
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tvb_free(tvb);
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}
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void
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tvb_set_free_cb(tvbuff_t* tvb, tvbuff_free_cb_t func)
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{
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g_assert(tvb->type == TVBUFF_REAL_DATA);
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tvb->free_cb = func;
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}
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2000-11-14 04:33:34 +00:00
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static void
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add_to_used_in_list(tvbuff_t *tvb, tvbuff_t *used_in)
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{
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tvb->used_in = g_slist_prepend(tvb->used_in, used_in);
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tvb_increment_usage_count(tvb, 1);
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}
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void
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tvb_set_child_real_data_tvbuff(tvbuff_t* parent, tvbuff_t* child)
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{
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g_assert(parent->initialized);
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g_assert(child->initialized);
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g_assert(child->type == TVBUFF_REAL_DATA);
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add_to_used_in_list(parent, child);
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}
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2000-05-11 08:18:09 +00:00
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void
|
2000-05-16 04:44:14 +00:00
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tvb_set_real_data(tvbuff_t* tvb, const guint8* data, guint length, gint reported_length)
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2000-05-11 08:18:09 +00:00
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{
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g_assert(tvb->type == TVBUFF_REAL_DATA);
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g_assert(!tvb->initialized);
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2000-09-13 20:17:23 +00:00
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if (reported_length < -1) {
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THROW(ReportedBoundsError);
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}
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2000-05-11 08:18:09 +00:00
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2000-05-16 04:44:14 +00:00
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tvb->real_data = (gpointer) data;
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tvb->length = length;
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tvb->reported_length = reported_length;
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tvb->initialized = TRUE;
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2000-05-11 08:18:09 +00:00
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}
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tvbuff_t*
|
2001-03-23 14:44:04 +00:00
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|
|
tvb_new_real_data(const guint8* data, guint length, gint reported_length, const gchar* ds_name)
|
2000-05-11 08:18:09 +00:00
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|
|
{
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tvbuff_t *tvb;
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tvb = tvb_new(TVBUFF_REAL_DATA);
|
2000-09-13 20:17:23 +00:00
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2000-09-13 20:30:06 +00:00
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|
|
CLEANUP_PUSH(tvb_free_void, tvb);
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2000-09-13 20:17:23 +00:00
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|
2000-05-16 04:44:14 +00:00
|
|
|
tvb_set_real_data(tvb, data, length, reported_length);
|
2000-05-11 08:18:09 +00:00
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|
2001-03-23 14:44:04 +00:00
|
|
|
/* set the data source name */
|
|
|
|
tvb->ds_name = g_strdup( ds_name);
|
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|
2000-09-13 20:17:23 +00:00
|
|
|
CLEANUP_POP;
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|
2000-05-11 08:18:09 +00:00
|
|
|
return tvb;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Computes the absolute offset and length based on a possibly-negative offset
|
|
|
|
* and a length that is possible -1 (which means "to the end of the data").
|
|
|
|
* Returns TRUE/FALSE indicating whether the offset is in bounds or
|
|
|
|
* not. The integer ptrs are modified with the new offset and length.
|
Add "tvb_reported_length()" to get the "reported length" of a tvbuff
(i.e., the amount of data that was in the packet, even if not all of it
was captured), for use when dissecting packets containing data that
fills the packet (we want the dissector to try to dissect all of it; if
it runs past the end of the captured data, we want it to throw an
exception so that we'll put a "Short Frame" note in the protocol tree).
This means we always want a tvbuff to have a real reported length value,
so we make it an unsigned integer, and don't bother checking it for -1,
as it should never be -1.
If the reported length passed in to "tvb_set_subset()" is -1, set the
reported length to the reported length of the tvbuff of which the new
tvbuff will be a subset minus the offset in that tvbuff of the subset,
so that "-1" means "what's left of the packet after we chop off the
header". This is necessary in order to ensure that all tvbuffs have a
real reported length value.
Have "dissect_packet()" set the reported length of the top-level tvbuff
to the reported length of the frame, so that we start out with a tvbuff
with a real reported length value.
Have "tvb_offset_exists()" return FALSE if the offset is past the end of
the tvbuff.
If the offset passed to it is postitive, have "compute_offset_length()"
check for that it's not more than one byte past the end of the tvbuff -
if it's just past the end, we don't want the check to fail, as we don't
want attempts to create a subset tvbuff containing zero bytes to fail;
that would be done if a captured packet was all header and no payload,
and we'd want the dissector of the payload, not the dissector of the
header, to throw an exception, as the problem isn't with the protocol
for the header, it's with the protocol for the payload.
Convert the ATM dissector, the SSCOP dissector, the Q.2931 dissector,
and the Q.931 dissector to use tvbuffs.
Make the LAPD dissector set up a tvbuff for the Q.931 dissector (it's
not converted yet).
svn path=/trunk/; revision=2023
2000-05-29 08:57:42 +00:00
|
|
|
* No exception is thrown.
|
|
|
|
*
|
|
|
|
* XXX - we return TRUE, not FALSE, if the offset is positive and right
|
|
|
|
* after the end of the tvbuff (i.e., equal to the length). We do this
|
|
|
|
* so that a dissector constructing a subset tvbuff for the next protocol
|
|
|
|
* will get a zero-length tvbuff, not an exception, if there's no data
|
|
|
|
* left for the next protocol - we want the next protocol to be the one
|
|
|
|
* that gets an exception, so the error is reported as an error in that
|
|
|
|
* protocol rather than the containing protocol. */
|
2000-05-11 08:18:09 +00:00
|
|
|
static gboolean
|
|
|
|
compute_offset_length(tvbuff_t *tvb, gint offset, gint length,
|
2000-05-16 04:44:14 +00:00
|
|
|
guint *offset_ptr, guint *length_ptr, int *exception)
|
2000-05-11 08:18:09 +00:00
|
|
|
{
|
|
|
|
g_assert(offset_ptr);
|
|
|
|
g_assert(length_ptr);
|
|
|
|
|
|
|
|
/* Compute the offset */
|
|
|
|
if (offset >= 0) {
|
Add "tvb_reported_length()" to get the "reported length" of a tvbuff
(i.e., the amount of data that was in the packet, even if not all of it
was captured), for use when dissecting packets containing data that
fills the packet (we want the dissector to try to dissect all of it; if
it runs past the end of the captured data, we want it to throw an
exception so that we'll put a "Short Frame" note in the protocol tree).
This means we always want a tvbuff to have a real reported length value,
so we make it an unsigned integer, and don't bother checking it for -1,
as it should never be -1.
If the reported length passed in to "tvb_set_subset()" is -1, set the
reported length to the reported length of the tvbuff of which the new
tvbuff will be a subset minus the offset in that tvbuff of the subset,
so that "-1" means "what's left of the packet after we chop off the
header". This is necessary in order to ensure that all tvbuffs have a
real reported length value.
Have "dissect_packet()" set the reported length of the top-level tvbuff
to the reported length of the frame, so that we start out with a tvbuff
with a real reported length value.
Have "tvb_offset_exists()" return FALSE if the offset is past the end of
the tvbuff.
If the offset passed to it is postitive, have "compute_offset_length()"
check for that it's not more than one byte past the end of the tvbuff -
if it's just past the end, we don't want the check to fail, as we don't
want attempts to create a subset tvbuff containing zero bytes to fail;
that would be done if a captured packet was all header and no payload,
and we'd want the dissector of the payload, not the dissector of the
header, to throw an exception, as the problem isn't with the protocol
for the header, it's with the protocol for the payload.
Convert the ATM dissector, the SSCOP dissector, the Q.2931 dissector,
and the Q.931 dissector to use tvbuffs.
Make the LAPD dissector set up a tvbuff for the Q.931 dissector (it's
not converted yet).
svn path=/trunk/; revision=2023
2000-05-29 08:57:42 +00:00
|
|
|
/* Positive offset - relative to the beginning of the packet. */
|
|
|
|
if (offset > tvb->reported_length) {
|
|
|
|
if (exception) {
|
|
|
|
*exception = ReportedBoundsError;
|
|
|
|
}
|
|
|
|
return FALSE;
|
2000-05-16 04:44:14 +00:00
|
|
|
}
|
Add "tvb_reported_length()" to get the "reported length" of a tvbuff
(i.e., the amount of data that was in the packet, even if not all of it
was captured), for use when dissecting packets containing data that
fills the packet (we want the dissector to try to dissect all of it; if
it runs past the end of the captured data, we want it to throw an
exception so that we'll put a "Short Frame" note in the protocol tree).
This means we always want a tvbuff to have a real reported length value,
so we make it an unsigned integer, and don't bother checking it for -1,
as it should never be -1.
If the reported length passed in to "tvb_set_subset()" is -1, set the
reported length to the reported length of the tvbuff of which the new
tvbuff will be a subset minus the offset in that tvbuff of the subset,
so that "-1" means "what's left of the packet after we chop off the
header". This is necessary in order to ensure that all tvbuffs have a
real reported length value.
Have "dissect_packet()" set the reported length of the top-level tvbuff
to the reported length of the frame, so that we start out with a tvbuff
with a real reported length value.
Have "tvb_offset_exists()" return FALSE if the offset is past the end of
the tvbuff.
If the offset passed to it is postitive, have "compute_offset_length()"
check for that it's not more than one byte past the end of the tvbuff -
if it's just past the end, we don't want the check to fail, as we don't
want attempts to create a subset tvbuff containing zero bytes to fail;
that would be done if a captured packet was all header and no payload,
and we'd want the dissector of the payload, not the dissector of the
header, to throw an exception, as the problem isn't with the protocol
for the header, it's with the protocol for the payload.
Convert the ATM dissector, the SSCOP dissector, the Q.2931 dissector,
and the Q.931 dissector to use tvbuffs.
Make the LAPD dissector set up a tvbuff for the Q.931 dissector (it's
not converted yet).
svn path=/trunk/; revision=2023
2000-05-29 08:57:42 +00:00
|
|
|
else if (offset > tvb->length) {
|
|
|
|
if (exception) {
|
|
|
|
*exception = BoundsError;
|
|
|
|
}
|
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
*offset_ptr = offset;
|
2000-05-16 04:44:14 +00:00
|
|
|
}
|
2000-05-11 08:18:09 +00:00
|
|
|
}
|
|
|
|
else {
|
Add "tvb_reported_length()" to get the "reported length" of a tvbuff
(i.e., the amount of data that was in the packet, even if not all of it
was captured), for use when dissecting packets containing data that
fills the packet (we want the dissector to try to dissect all of it; if
it runs past the end of the captured data, we want it to throw an
exception so that we'll put a "Short Frame" note in the protocol tree).
This means we always want a tvbuff to have a real reported length value,
so we make it an unsigned integer, and don't bother checking it for -1,
as it should never be -1.
If the reported length passed in to "tvb_set_subset()" is -1, set the
reported length to the reported length of the tvbuff of which the new
tvbuff will be a subset minus the offset in that tvbuff of the subset,
so that "-1" means "what's left of the packet after we chop off the
header". This is necessary in order to ensure that all tvbuffs have a
real reported length value.
Have "dissect_packet()" set the reported length of the top-level tvbuff
to the reported length of the frame, so that we start out with a tvbuff
with a real reported length value.
Have "tvb_offset_exists()" return FALSE if the offset is past the end of
the tvbuff.
If the offset passed to it is postitive, have "compute_offset_length()"
check for that it's not more than one byte past the end of the tvbuff -
if it's just past the end, we don't want the check to fail, as we don't
want attempts to create a subset tvbuff containing zero bytes to fail;
that would be done if a captured packet was all header and no payload,
and we'd want the dissector of the payload, not the dissector of the
header, to throw an exception, as the problem isn't with the protocol
for the header, it's with the protocol for the payload.
Convert the ATM dissector, the SSCOP dissector, the Q.2931 dissector,
and the Q.931 dissector to use tvbuffs.
Make the LAPD dissector set up a tvbuff for the Q.931 dissector (it's
not converted yet).
svn path=/trunk/; revision=2023
2000-05-29 08:57:42 +00:00
|
|
|
/* Negative offset - relative to the end of the packet. */
|
|
|
|
if (-offset > tvb->reported_length) {
|
|
|
|
if (exception) {
|
|
|
|
*exception = ReportedBoundsError;
|
|
|
|
}
|
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
else if (-offset > tvb->length) {
|
|
|
|
if (exception) {
|
|
|
|
*exception = BoundsError;
|
|
|
|
}
|
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
*offset_ptr = tvb->length + offset;
|
|
|
|
}
|
2000-05-11 08:18:09 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Compute the length */
|
|
|
|
g_assert(length >= -1);
|
|
|
|
if (length == -1) {
|
|
|
|
*length_ptr = tvb->length - *offset_ptr;
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
*length_ptr = length;
|
|
|
|
}
|
|
|
|
|
|
|
|
return TRUE;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static gboolean
|
|
|
|
check_offset_length_no_exception(tvbuff_t *tvb, gint offset, gint length,
|
2000-05-16 04:44:14 +00:00
|
|
|
guint *offset_ptr, guint *length_ptr, int *exception)
|
2000-05-11 08:18:09 +00:00
|
|
|
{
|
|
|
|
g_assert(tvb->initialized);
|
|
|
|
|
2000-05-16 04:44:14 +00:00
|
|
|
if (!compute_offset_length(tvb, offset, length, offset_ptr, length_ptr, exception)) {
|
2000-05-11 08:18:09 +00:00
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (*offset_ptr + *length_ptr <= tvb->length) {
|
|
|
|
return TRUE;
|
|
|
|
}
|
2000-05-16 04:44:14 +00:00
|
|
|
else if (*offset_ptr + *length_ptr <= tvb->reported_length) {
|
|
|
|
if (exception) {
|
|
|
|
*exception = BoundsError;
|
|
|
|
}
|
|
|
|
return FALSE;
|
|
|
|
}
|
2000-05-11 08:18:09 +00:00
|
|
|
else {
|
2000-05-16 04:44:14 +00:00
|
|
|
if (exception) {
|
|
|
|
*exception = ReportedBoundsError;
|
|
|
|
}
|
2000-05-11 08:18:09 +00:00
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
|
|
|
|
g_assert_not_reached();
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Checks (+/-) offset and length and throws BoundsError if
|
|
|
|
* either is out of bounds. Sets integer ptrs to the new offset
|
|
|
|
* and length. */
|
|
|
|
static void
|
|
|
|
check_offset_length(tvbuff_t *tvb, gint offset, gint length,
|
|
|
|
guint *offset_ptr, guint *length_ptr)
|
|
|
|
{
|
2000-05-16 04:44:14 +00:00
|
|
|
int exception = 0;
|
|
|
|
|
|
|
|
if (!check_offset_length_no_exception(tvb, offset, length, offset_ptr, length_ptr, &exception)) {
|
|
|
|
g_assert(exception > 0);
|
|
|
|
THROW(exception);
|
2000-05-11 08:18:09 +00:00
|
|
|
}
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
tvb_set_subset(tvbuff_t *tvb, tvbuff_t *backing,
|
2000-05-16 04:44:14 +00:00
|
|
|
gint backing_offset, gint backing_length, gint reported_length)
|
2000-05-11 08:18:09 +00:00
|
|
|
{
|
|
|
|
g_assert(tvb->type == TVBUFF_SUBSET);
|
|
|
|
g_assert(!tvb->initialized);
|
|
|
|
|
2000-09-13 20:17:23 +00:00
|
|
|
if (reported_length < -1) {
|
|
|
|
THROW(ReportedBoundsError);
|
|
|
|
}
|
|
|
|
|
2000-05-11 08:18:09 +00:00
|
|
|
check_offset_length(backing, backing_offset, backing_length,
|
|
|
|
&tvb->tvbuffs.subset.offset,
|
|
|
|
&tvb->tvbuffs.subset.length);
|
|
|
|
|
2000-05-16 04:44:14 +00:00
|
|
|
tvb->tvbuffs.subset.tvb = backing;
|
|
|
|
tvb->length = tvb->tvbuffs.subset.length;
|
2000-09-13 20:17:23 +00:00
|
|
|
|
Add "tvb_reported_length()" to get the "reported length" of a tvbuff
(i.e., the amount of data that was in the packet, even if not all of it
was captured), for use when dissecting packets containing data that
fills the packet (we want the dissector to try to dissect all of it; if
it runs past the end of the captured data, we want it to throw an
exception so that we'll put a "Short Frame" note in the protocol tree).
This means we always want a tvbuff to have a real reported length value,
so we make it an unsigned integer, and don't bother checking it for -1,
as it should never be -1.
If the reported length passed in to "tvb_set_subset()" is -1, set the
reported length to the reported length of the tvbuff of which the new
tvbuff will be a subset minus the offset in that tvbuff of the subset,
so that "-1" means "what's left of the packet after we chop off the
header". This is necessary in order to ensure that all tvbuffs have a
real reported length value.
Have "dissect_packet()" set the reported length of the top-level tvbuff
to the reported length of the frame, so that we start out with a tvbuff
with a real reported length value.
Have "tvb_offset_exists()" return FALSE if the offset is past the end of
the tvbuff.
If the offset passed to it is postitive, have "compute_offset_length()"
check for that it's not more than one byte past the end of the tvbuff -
if it's just past the end, we don't want the check to fail, as we don't
want attempts to create a subset tvbuff containing zero bytes to fail;
that would be done if a captured packet was all header and no payload,
and we'd want the dissector of the payload, not the dissector of the
header, to throw an exception, as the problem isn't with the protocol
for the header, it's with the protocol for the payload.
Convert the ATM dissector, the SSCOP dissector, the Q.2931 dissector,
and the Q.931 dissector to use tvbuffs.
Make the LAPD dissector set up a tvbuff for the Q.931 dissector (it's
not converted yet).
svn path=/trunk/; revision=2023
2000-05-29 08:57:42 +00:00
|
|
|
if (reported_length == -1) {
|
|
|
|
tvb->reported_length = backing->reported_length - tvb->tvbuffs.subset.offset;
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
tvb->reported_length = reported_length;
|
|
|
|
}
|
2000-05-16 04:44:14 +00:00
|
|
|
tvb->initialized = TRUE;
|
2000-05-11 08:18:09 +00:00
|
|
|
add_to_used_in_list(backing, tvb);
|
|
|
|
|
|
|
|
/* Optimization. If the backing buffer has a pointer to contiguous, real data,
|
|
|
|
* then we can point directly to our starting offset in that buffer */
|
|
|
|
if (backing->real_data != NULL) {
|
|
|
|
tvb->real_data = backing->real_data + tvb->tvbuffs.subset.offset;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
tvbuff_t*
|
2000-05-16 04:44:14 +00:00
|
|
|
tvb_new_subset(tvbuff_t *backing, gint backing_offset, gint backing_length, gint reported_length)
|
2000-05-11 08:18:09 +00:00
|
|
|
{
|
|
|
|
tvbuff_t *tvb;
|
|
|
|
|
|
|
|
tvb = tvb_new(TVBUFF_SUBSET);
|
2000-09-13 20:17:23 +00:00
|
|
|
|
2000-09-13 20:30:06 +00:00
|
|
|
CLEANUP_PUSH(tvb_free_void, tvb);
|
2000-09-13 20:17:23 +00:00
|
|
|
|
2000-05-16 04:44:14 +00:00
|
|
|
tvb_set_subset(tvb, backing, backing_offset, backing_length, reported_length);
|
2000-05-11 08:18:09 +00:00
|
|
|
|
2001-03-23 14:44:04 +00:00
|
|
|
tvb->ds_name = backing->ds_name;
|
2000-09-13 20:17:23 +00:00
|
|
|
CLEANUP_POP;
|
|
|
|
|
2000-05-11 08:18:09 +00:00
|
|
|
return tvb;
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
tvb_composite_append(tvbuff_t* tvb, tvbuff_t* member)
|
|
|
|
{
|
|
|
|
tvb_comp_t *composite;
|
|
|
|
|
|
|
|
g_assert(!tvb->initialized);
|
|
|
|
composite = &tvb->tvbuffs.composite;
|
|
|
|
composite->tvbs = g_slist_append( composite->tvbs, member );
|
2000-11-14 04:33:34 +00:00
|
|
|
add_to_used_in_list(member, tvb);
|
2000-05-11 08:18:09 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
tvb_composite_prepend(tvbuff_t* tvb, tvbuff_t* member)
|
|
|
|
{
|
|
|
|
tvb_comp_t *composite;
|
|
|
|
|
|
|
|
g_assert(!tvb->initialized);
|
|
|
|
composite = &tvb->tvbuffs.composite;
|
|
|
|
composite->tvbs = g_slist_prepend( composite->tvbs, member );
|
2000-11-14 04:33:34 +00:00
|
|
|
add_to_used_in_list(member, tvb);
|
2000-05-11 08:18:09 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
tvbuff_t*
|
|
|
|
tvb_new_composite(void)
|
|
|
|
{
|
|
|
|
return tvb_new(TVBUFF_COMPOSITE);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
tvb_composite_finalize(tvbuff_t* tvb)
|
|
|
|
{
|
|
|
|
GSList *slist;
|
|
|
|
guint num_members;
|
|
|
|
tvbuff_t *member_tvb;
|
|
|
|
tvb_comp_t *composite;
|
|
|
|
int i = 0;
|
|
|
|
|
|
|
|
g_assert(!tvb->initialized);
|
|
|
|
g_assert(tvb->length == 0);
|
|
|
|
|
|
|
|
composite = &tvb->tvbuffs.composite;
|
|
|
|
num_members = g_slist_length(composite->tvbs);
|
|
|
|
|
|
|
|
composite->start_offsets = g_new(guint, num_members);
|
|
|
|
composite->end_offsets = g_new(guint, num_members);
|
|
|
|
|
|
|
|
for (slist = composite->tvbs; slist != NULL; slist = slist->next) {
|
|
|
|
g_assert(i < num_members);
|
|
|
|
member_tvb = slist->data;
|
|
|
|
composite->start_offsets[i] = tvb->length;
|
|
|
|
tvb->length += member_tvb->length;
|
|
|
|
composite->end_offsets[i] = tvb->length - 1;
|
|
|
|
i++;
|
|
|
|
}
|
|
|
|
|
|
|
|
tvb->initialized = TRUE;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
guint
|
|
|
|
tvb_length(tvbuff_t* tvb)
|
|
|
|
{
|
|
|
|
g_assert(tvb->initialized);
|
|
|
|
|
|
|
|
return tvb->length;
|
|
|
|
}
|
|
|
|
|
2000-12-27 12:48:27 +00:00
|
|
|
gint
|
2000-05-11 08:18:09 +00:00
|
|
|
tvb_length_remaining(tvbuff_t *tvb, gint offset)
|
|
|
|
{
|
|
|
|
guint abs_offset, abs_length;
|
|
|
|
|
|
|
|
g_assert(tvb->initialized);
|
|
|
|
|
2000-05-16 04:44:14 +00:00
|
|
|
if (compute_offset_length(tvb, offset, -1, &abs_offset, &abs_length, NULL)) {
|
2000-05-11 08:18:09 +00:00
|
|
|
return abs_length;
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* Validates that 'length' bytes are available starting from
|
|
|
|
* offset (pos/neg). Does not throw BoundsError exception. */
|
|
|
|
gboolean
|
|
|
|
tvb_bytes_exist(tvbuff_t *tvb, gint offset, gint length)
|
|
|
|
{
|
|
|
|
guint abs_offset, abs_length;
|
|
|
|
|
|
|
|
g_assert(tvb->initialized);
|
|
|
|
|
2000-05-16 04:44:14 +00:00
|
|
|
if (!compute_offset_length(tvb, offset, length, &abs_offset, &abs_length, NULL))
|
2000-05-11 08:18:09 +00:00
|
|
|
return FALSE;
|
|
|
|
|
|
|
|
if (abs_offset + abs_length <= tvb->length) {
|
|
|
|
return TRUE;
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
gboolean
|
|
|
|
tvb_offset_exists(tvbuff_t *tvb, gint offset)
|
|
|
|
{
|
|
|
|
guint abs_offset, abs_length;
|
|
|
|
|
|
|
|
g_assert(tvb->initialized);
|
Add "tvb_reported_length()" to get the "reported length" of a tvbuff
(i.e., the amount of data that was in the packet, even if not all of it
was captured), for use when dissecting packets containing data that
fills the packet (we want the dissector to try to dissect all of it; if
it runs past the end of the captured data, we want it to throw an
exception so that we'll put a "Short Frame" note in the protocol tree).
This means we always want a tvbuff to have a real reported length value,
so we make it an unsigned integer, and don't bother checking it for -1,
as it should never be -1.
If the reported length passed in to "tvb_set_subset()" is -1, set the
reported length to the reported length of the tvbuff of which the new
tvbuff will be a subset minus the offset in that tvbuff of the subset,
so that "-1" means "what's left of the packet after we chop off the
header". This is necessary in order to ensure that all tvbuffs have a
real reported length value.
Have "dissect_packet()" set the reported length of the top-level tvbuff
to the reported length of the frame, so that we start out with a tvbuff
with a real reported length value.
Have "tvb_offset_exists()" return FALSE if the offset is past the end of
the tvbuff.
If the offset passed to it is postitive, have "compute_offset_length()"
check for that it's not more than one byte past the end of the tvbuff -
if it's just past the end, we don't want the check to fail, as we don't
want attempts to create a subset tvbuff containing zero bytes to fail;
that would be done if a captured packet was all header and no payload,
and we'd want the dissector of the payload, not the dissector of the
header, to throw an exception, as the problem isn't with the protocol
for the header, it's with the protocol for the payload.
Convert the ATM dissector, the SSCOP dissector, the Q.2931 dissector,
and the Q.931 dissector to use tvbuffs.
Make the LAPD dissector set up a tvbuff for the Q.931 dissector (it's
not converted yet).
svn path=/trunk/; revision=2023
2000-05-29 08:57:42 +00:00
|
|
|
if (!compute_offset_length(tvb, offset, -1, &abs_offset, &abs_length, NULL))
|
|
|
|
return FALSE;
|
|
|
|
|
|
|
|
if (abs_offset < tvb->length) {
|
2000-05-11 08:18:09 +00:00
|
|
|
return TRUE;
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
Add "tvb_reported_length()" to get the "reported length" of a tvbuff
(i.e., the amount of data that was in the packet, even if not all of it
was captured), for use when dissecting packets containing data that
fills the packet (we want the dissector to try to dissect all of it; if
it runs past the end of the captured data, we want it to throw an
exception so that we'll put a "Short Frame" note in the protocol tree).
This means we always want a tvbuff to have a real reported length value,
so we make it an unsigned integer, and don't bother checking it for -1,
as it should never be -1.
If the reported length passed in to "tvb_set_subset()" is -1, set the
reported length to the reported length of the tvbuff of which the new
tvbuff will be a subset minus the offset in that tvbuff of the subset,
so that "-1" means "what's left of the packet after we chop off the
header". This is necessary in order to ensure that all tvbuffs have a
real reported length value.
Have "dissect_packet()" set the reported length of the top-level tvbuff
to the reported length of the frame, so that we start out with a tvbuff
with a real reported length value.
Have "tvb_offset_exists()" return FALSE if the offset is past the end of
the tvbuff.
If the offset passed to it is postitive, have "compute_offset_length()"
check for that it's not more than one byte past the end of the tvbuff -
if it's just past the end, we don't want the check to fail, as we don't
want attempts to create a subset tvbuff containing zero bytes to fail;
that would be done if a captured packet was all header and no payload,
and we'd want the dissector of the payload, not the dissector of the
header, to throw an exception, as the problem isn't with the protocol
for the header, it's with the protocol for the payload.
Convert the ATM dissector, the SSCOP dissector, the Q.2931 dissector,
and the Q.931 dissector to use tvbuffs.
Make the LAPD dissector set up a tvbuff for the Q.931 dissector (it's
not converted yet).
svn path=/trunk/; revision=2023
2000-05-29 08:57:42 +00:00
|
|
|
guint
|
|
|
|
tvb_reported_length(tvbuff_t* tvb)
|
|
|
|
{
|
|
|
|
g_assert(tvb->initialized);
|
|
|
|
|
|
|
|
return tvb->reported_length;
|
|
|
|
}
|
|
|
|
|
2000-12-27 12:48:27 +00:00
|
|
|
gint
|
|
|
|
tvb_reported_length_remaining(tvbuff_t *tvb, gint offset)
|
|
|
|
{
|
|
|
|
guint abs_offset, abs_length;
|
|
|
|
|
|
|
|
g_assert(tvb->initialized);
|
|
|
|
|
|
|
|
if (compute_offset_length(tvb, offset, -1, &abs_offset, &abs_length, NULL)) {
|
|
|
|
if (tvb->reported_length >= abs_offset)
|
|
|
|
return tvb->reported_length - abs_offset;
|
|
|
|
else
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
Tvbuffify the IP, ICMP, TCP, UDP, OSI CLNP, OSI COTP, OSI CLTP, and OSI
ESIS dissectors.
Register the IP dissector and have dissectors that call it directly
(rather than through a port table) call it through a handle.
Add a routine "tvb_set_reported_length()" which a dissector can use if
it was handed a tvbuff that contains more data than is actually in its
part of the packet - for example, handing a padded Ethernet frame to IP;
the routine sets the reported length of the tvbuff (and also adjusts the
actual length, as appropriate). Then use it in IP.
Given that, "ethertype()" can determine how much of the Ethernet frame
was actually part of an IP datagram (and can do the same for other
protocols under Ethernet that use "tvb_set_reported_length()"; have it
return the actual length, and have "dissect_eth()" and "dissect_vlan()"
use that to mark trailer data in Ethernet II frames as well as in 802.3
frames.
svn path=/trunk/; revision=2658
2000-11-18 10:38:33 +00:00
|
|
|
/* Set the reported length of a tvbuff to a given value; used for protocols
|
|
|
|
whose headers contain an explicit length and where the calling
|
|
|
|
dissector's payload may include padding as well as the packet for
|
|
|
|
this protocol.
|
2000-05-11 08:18:09 +00:00
|
|
|
|
Tvbuffify the IP, ICMP, TCP, UDP, OSI CLNP, OSI COTP, OSI CLTP, and OSI
ESIS dissectors.
Register the IP dissector and have dissectors that call it directly
(rather than through a port table) call it through a handle.
Add a routine "tvb_set_reported_length()" which a dissector can use if
it was handed a tvbuff that contains more data than is actually in its
part of the packet - for example, handing a padded Ethernet frame to IP;
the routine sets the reported length of the tvbuff (and also adjusts the
actual length, as appropriate). Then use it in IP.
Given that, "ethertype()" can determine how much of the Ethernet frame
was actually part of an IP datagram (and can do the same for other
protocols under Ethernet that use "tvb_set_reported_length()"; have it
return the actual length, and have "dissect_eth()" and "dissect_vlan()"
use that to mark trailer data in Ethernet II frames as well as in 802.3
frames.
svn path=/trunk/; revision=2658
2000-11-18 10:38:33 +00:00
|
|
|
Also adjusts the data length. */
|
|
|
|
void
|
|
|
|
tvb_set_reported_length(tvbuff_t* tvb, guint reported_length)
|
|
|
|
{
|
|
|
|
g_assert(tvb->initialized);
|
2000-11-30 03:24:16 +00:00
|
|
|
|
|
|
|
if (reported_length > tvb->reported_length)
|
|
|
|
THROW(ReportedBoundsError);
|
Tvbuffify the IP, ICMP, TCP, UDP, OSI CLNP, OSI COTP, OSI CLTP, and OSI
ESIS dissectors.
Register the IP dissector and have dissectors that call it directly
(rather than through a port table) call it through a handle.
Add a routine "tvb_set_reported_length()" which a dissector can use if
it was handed a tvbuff that contains more data than is actually in its
part of the packet - for example, handing a padded Ethernet frame to IP;
the routine sets the reported length of the tvbuff (and also adjusts the
actual length, as appropriate). Then use it in IP.
Given that, "ethertype()" can determine how much of the Ethernet frame
was actually part of an IP datagram (and can do the same for other
protocols under Ethernet that use "tvb_set_reported_length()"; have it
return the actual length, and have "dissect_eth()" and "dissect_vlan()"
use that to mark trailer data in Ethernet II frames as well as in 802.3
frames.
svn path=/trunk/; revision=2658
2000-11-18 10:38:33 +00:00
|
|
|
|
|
|
|
tvb->reported_length = reported_length;
|
|
|
|
if (reported_length < tvb->length)
|
|
|
|
tvb->length = reported_length;
|
|
|
|
}
|
2000-05-11 08:18:09 +00:00
|
|
|
|
|
|
|
|
2000-06-09 21:15:46 +00:00
|
|
|
static guint8*
|
2000-05-11 08:18:09 +00:00
|
|
|
first_real_data_ptr(tvbuff_t *tvb)
|
|
|
|
{
|
|
|
|
tvbuff_t *member;
|
|
|
|
|
|
|
|
switch(tvb->type) {
|
|
|
|
case TVBUFF_REAL_DATA:
|
|
|
|
return tvb->real_data;
|
|
|
|
case TVBUFF_SUBSET:
|
|
|
|
member = tvb->tvbuffs.subset.tvb;
|
|
|
|
return first_real_data_ptr(member);
|
|
|
|
case TVBUFF_COMPOSITE:
|
|
|
|
member = tvb->tvbuffs.composite.tvbs->data;
|
|
|
|
return first_real_data_ptr(member);
|
|
|
|
}
|
|
|
|
|
|
|
|
g_assert_not_reached();
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2000-06-09 21:15:46 +00:00
|
|
|
static int
|
2000-05-11 08:18:09 +00:00
|
|
|
offset_from_real_beginning(tvbuff_t *tvb, int counter)
|
|
|
|
{
|
|
|
|
tvbuff_t *member;
|
|
|
|
|
|
|
|
switch(tvb->type) {
|
|
|
|
case TVBUFF_REAL_DATA:
|
|
|
|
return counter;
|
|
|
|
case TVBUFF_SUBSET:
|
|
|
|
member = tvb->tvbuffs.subset.tvb;
|
|
|
|
return offset_from_real_beginning(member, counter + tvb->tvbuffs.subset.offset);
|
|
|
|
case TVBUFF_COMPOSITE:
|
|
|
|
member = tvb->tvbuffs.composite.tvbs->data;
|
|
|
|
return offset_from_real_beginning(member, counter);
|
|
|
|
}
|
|
|
|
|
|
|
|
g_assert_not_reached();
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
gint
|
|
|
|
tvb_raw_offset(tvbuff_t *tvb)
|
|
|
|
{
|
|
|
|
if (tvb->raw_offset == -1) {
|
|
|
|
tvb->raw_offset = offset_from_real_beginning(tvb, 0);
|
|
|
|
}
|
|
|
|
return tvb->raw_offset;
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
tvb_compat(tvbuff_t *tvb, const guint8 **pd, int *offset)
|
|
|
|
{
|
|
|
|
g_assert(tvb->initialized);
|
|
|
|
*pd = first_real_data_ptr(tvb);
|
|
|
|
*offset = tvb_raw_offset(tvb);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static guint8*
|
|
|
|
composite_ensure_contiguous(tvbuff_t *tvb, guint abs_offset, guint abs_length)
|
|
|
|
{
|
|
|
|
guint i, num_members;
|
|
|
|
tvb_comp_t *composite;
|
|
|
|
tvbuff_t *member_tvb = NULL;
|
|
|
|
guint member_offset, member_length;
|
|
|
|
GSList *slist;
|
|
|
|
|
|
|
|
g_assert(tvb->type == TVBUFF_COMPOSITE);
|
|
|
|
|
|
|
|
/* Maybe the range specified by offset/length
|
|
|
|
* is contiguous inside one of the member tvbuffs */
|
|
|
|
composite = &tvb->tvbuffs.composite;
|
|
|
|
num_members = g_slist_length(composite->tvbs);
|
|
|
|
|
|
|
|
for (i = 0; i < num_members; i++) {
|
|
|
|
if (abs_offset <= composite->end_offsets[i]) {
|
|
|
|
slist = g_slist_nth(composite->tvbs, i);
|
|
|
|
member_tvb = slist->data;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
g_assert(member_tvb);
|
|
|
|
|
|
|
|
if (check_offset_length_no_exception(member_tvb, abs_offset - composite->start_offsets[i],
|
2000-05-16 04:44:14 +00:00
|
|
|
abs_length, &member_offset, &member_length, NULL)) {
|
2000-05-11 08:18:09 +00:00
|
|
|
|
|
|
|
g_assert(!tvb->real_data);
|
|
|
|
return ensure_contiguous(member_tvb, member_offset, member_length);
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
tvb->real_data = tvb_memdup(tvb, 0, -1);
|
|
|
|
return tvb->real_data + abs_offset;
|
|
|
|
}
|
|
|
|
|
|
|
|
g_assert_not_reached();
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static guint8*
|
|
|
|
ensure_contiguous(tvbuff_t *tvb, gint offset, gint length)
|
|
|
|
{
|
|
|
|
guint abs_offset, abs_length;
|
|
|
|
|
|
|
|
check_offset_length(tvb, offset, length, &abs_offset, &abs_length);
|
|
|
|
|
|
|
|
if (tvb->real_data) {
|
|
|
|
return tvb->real_data + abs_offset;
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
switch(tvb->type) {
|
|
|
|
case TVBUFF_REAL_DATA:
|
|
|
|
g_assert_not_reached();
|
|
|
|
case TVBUFF_SUBSET:
|
|
|
|
return ensure_contiguous(tvb->tvbuffs.subset.tvb,
|
|
|
|
abs_offset - tvb->tvbuffs.subset.offset,
|
|
|
|
abs_length);
|
|
|
|
case TVBUFF_COMPOSITE:
|
|
|
|
return composite_ensure_contiguous(tvb, abs_offset, abs_length);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
g_assert_not_reached();
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2000-08-30 02:50:18 +00:00
|
|
|
static const guint8*
|
|
|
|
guint8_find(const guint8* haystack, size_t haystacklen, guint8 needle)
|
|
|
|
{
|
|
|
|
const guint8 *b;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (b = haystack, i = 0; i < haystacklen; i++, b++) {
|
|
|
|
if (*b == needle) {
|
|
|
|
return b;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2000-11-10 06:50:37 +00:00
|
|
|
static const guint8*
|
|
|
|
guint8_pbrk(const guint8* haystack, size_t haystacklen, guint8 *needles)
|
|
|
|
{
|
|
|
|
const guint8 *b;
|
|
|
|
int i;
|
|
|
|
guint8 item, *needlep, needle;
|
|
|
|
|
|
|
|
for (b = haystack, i = 0; i < haystacklen; i++, b++) {
|
|
|
|
item = *b;
|
|
|
|
needlep = needles;
|
|
|
|
while ((needle = *needlep) != '\0') {
|
|
|
|
if (item == needle)
|
|
|
|
return b;
|
|
|
|
needlep++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2000-08-30 02:50:18 +00:00
|
|
|
|
2000-05-11 08:18:09 +00:00
|
|
|
|
|
|
|
/************** ACCESSORS **************/
|
|
|
|
|
|
|
|
static guint8*
|
|
|
|
composite_memcpy(tvbuff_t *tvb, guint8* target, guint abs_offset, guint abs_length)
|
|
|
|
{
|
|
|
|
guint i, num_members;
|
|
|
|
tvb_comp_t *composite;
|
|
|
|
tvbuff_t *member_tvb = NULL;
|
|
|
|
guint member_offset, member_length;
|
|
|
|
gboolean retval;
|
|
|
|
GSList *slist;
|
|
|
|
|
|
|
|
g_assert(tvb->type == TVBUFF_COMPOSITE);
|
|
|
|
|
|
|
|
/* Maybe the range specified by offset/length
|
|
|
|
* is contiguous inside one of the member tvbuffs */
|
|
|
|
composite = &tvb->tvbuffs.composite;
|
|
|
|
num_members = g_slist_length(composite->tvbs);
|
|
|
|
|
|
|
|
for (i = 0; i < num_members; i++) {
|
|
|
|
if (abs_offset <= composite->end_offsets[i]) {
|
|
|
|
slist = g_slist_nth(composite->tvbs, i);
|
|
|
|
member_tvb = slist->data;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
g_assert(member_tvb);
|
|
|
|
|
|
|
|
if (check_offset_length_no_exception(member_tvb, abs_offset - composite->start_offsets[i],
|
2000-05-16 04:44:14 +00:00
|
|
|
abs_length, &member_offset, &member_length, NULL)) {
|
2000-05-11 08:18:09 +00:00
|
|
|
|
|
|
|
g_assert(!tvb->real_data);
|
|
|
|
return tvb_memcpy(member_tvb, target, member_offset, member_length);
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
/* The requested data is non-contiguous inside
|
|
|
|
* the member tvb. We have to memcpy() the part that's in the member tvb,
|
|
|
|
* then iterate across the other member tvb's, copying their portions
|
|
|
|
* until we have copied all data.
|
|
|
|
*/
|
|
|
|
retval = compute_offset_length(member_tvb, abs_offset - composite->start_offsets[i], -1,
|
2000-05-16 04:44:14 +00:00
|
|
|
&member_offset, &member_length, NULL);
|
2000-05-11 08:18:09 +00:00
|
|
|
g_assert(retval);
|
|
|
|
|
|
|
|
tvb_memcpy(member_tvb, target, member_offset, member_length);
|
|
|
|
abs_offset += member_length;
|
|
|
|
abs_length -= member_length;
|
|
|
|
|
|
|
|
/* Recurse */
|
|
|
|
if (abs_length > 0) {
|
|
|
|
composite_memcpy(tvb, target + member_length, abs_offset, abs_length);
|
|
|
|
}
|
|
|
|
|
|
|
|
return target;
|
|
|
|
}
|
|
|
|
|
|
|
|
g_assert_not_reached();
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
guint8*
|
|
|
|
tvb_memcpy(tvbuff_t *tvb, guint8* target, gint offset, gint length)
|
|
|
|
{
|
|
|
|
guint abs_offset, abs_length;
|
|
|
|
|
2000-08-30 02:50:18 +00:00
|
|
|
g_assert(length >= -1);
|
2000-05-11 08:18:09 +00:00
|
|
|
check_offset_length(tvb, offset, length, &abs_offset, &abs_length);
|
|
|
|
|
|
|
|
if (tvb->real_data) {
|
|
|
|
return (guint8*) memcpy(target, tvb->real_data + abs_offset, abs_length);
|
|
|
|
}
|
|
|
|
|
|
|
|
switch(tvb->type) {
|
|
|
|
case TVBUFF_REAL_DATA:
|
|
|
|
g_assert_not_reached();
|
|
|
|
|
|
|
|
case TVBUFF_SUBSET:
|
|
|
|
return tvb_memcpy(tvb->tvbuffs.subset.tvb, target,
|
|
|
|
abs_offset - tvb->tvbuffs.subset.offset,
|
|
|
|
abs_length);
|
|
|
|
|
|
|
|
case TVBUFF_COMPOSITE:
|
|
|
|
return composite_memcpy(tvb, target, offset, length);
|
|
|
|
}
|
|
|
|
|
|
|
|
g_assert_not_reached();
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
guint8*
|
|
|
|
tvb_memdup(tvbuff_t *tvb, gint offset, gint length)
|
|
|
|
{
|
|
|
|
guint abs_offset, abs_length;
|
|
|
|
guint8 *duped;
|
|
|
|
|
|
|
|
check_offset_length(tvb, offset, length, &abs_offset, &abs_length);
|
|
|
|
|
|
|
|
duped = g_malloc(abs_length);
|
|
|
|
return tvb_memcpy(tvb, duped, abs_offset, abs_length);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
2001-03-13 21:34:28 +00:00
|
|
|
const guint8*
|
2000-05-11 08:18:09 +00:00
|
|
|
tvb_get_ptr(tvbuff_t *tvb, gint offset, gint length)
|
|
|
|
{
|
|
|
|
return ensure_contiguous(tvb, offset, length);
|
|
|
|
}
|
|
|
|
|
|
|
|
guint8
|
|
|
|
tvb_get_guint8(tvbuff_t *tvb, gint offset)
|
|
|
|
{
|
|
|
|
guint8* ptr;
|
|
|
|
|
|
|
|
ptr = ensure_contiguous(tvb, offset, sizeof(guint8));
|
|
|
|
return *ptr;
|
|
|
|
}
|
|
|
|
|
|
|
|
guint16
|
|
|
|
tvb_get_ntohs(tvbuff_t *tvb, gint offset)
|
|
|
|
{
|
|
|
|
guint8* ptr;
|
|
|
|
|
|
|
|
ptr = ensure_contiguous(tvb, offset, sizeof(guint16));
|
|
|
|
return pntohs(ptr);
|
|
|
|
}
|
|
|
|
|
2000-08-10 07:58:44 +00:00
|
|
|
guint32
|
|
|
|
tvb_get_ntoh24(tvbuff_t *tvb, gint offset)
|
|
|
|
{
|
|
|
|
guint8* ptr;
|
|
|
|
|
|
|
|
ptr = ensure_contiguous(tvb, offset, 3);
|
|
|
|
return pntoh24(ptr);
|
|
|
|
}
|
|
|
|
|
2000-05-11 08:18:09 +00:00
|
|
|
guint32
|
|
|
|
tvb_get_ntohl(tvbuff_t *tvb, gint offset)
|
|
|
|
{
|
|
|
|
guint8* ptr;
|
|
|
|
|
|
|
|
ptr = ensure_contiguous(tvb, offset, sizeof(guint32));
|
|
|
|
return pntohl(ptr);
|
|
|
|
}
|
|
|
|
|
2000-08-10 07:58:44 +00:00
|
|
|
#ifdef G_HAVE_GINT64
|
|
|
|
guint64
|
|
|
|
tvb_get_ntohll(tvbuff_t *tvb, gint offset)
|
2000-05-15 04:37:27 +00:00
|
|
|
{
|
|
|
|
guint8* ptr;
|
|
|
|
|
2000-08-10 07:58:44 +00:00
|
|
|
ptr = ensure_contiguous(tvb, offset, sizeof(guint64));
|
|
|
|
return pntohll(ptr);
|
2000-05-15 04:37:27 +00:00
|
|
|
}
|
2000-08-10 07:58:44 +00:00
|
|
|
#endif
|
2000-05-15 04:37:27 +00:00
|
|
|
|
2000-05-11 08:18:09 +00:00
|
|
|
guint16
|
|
|
|
tvb_get_letohs(tvbuff_t *tvb, gint offset)
|
|
|
|
{
|
|
|
|
guint8* ptr;
|
|
|
|
|
|
|
|
ptr = ensure_contiguous(tvb, offset, sizeof(guint16));
|
|
|
|
return pletohs(ptr);
|
|
|
|
}
|
|
|
|
|
2000-08-10 07:58:44 +00:00
|
|
|
guint32
|
|
|
|
tvb_get_letoh24(tvbuff_t *tvb, gint offset)
|
|
|
|
{
|
|
|
|
guint8* ptr;
|
|
|
|
|
|
|
|
ptr = ensure_contiguous(tvb, offset, 3);
|
|
|
|
return pletoh24(ptr);
|
|
|
|
}
|
|
|
|
|
2000-05-11 08:18:09 +00:00
|
|
|
guint32
|
|
|
|
tvb_get_letohl(tvbuff_t *tvb, gint offset)
|
|
|
|
{
|
|
|
|
guint8* ptr;
|
|
|
|
|
|
|
|
ptr = ensure_contiguous(tvb, offset, sizeof(guint32));
|
|
|
|
return pletohl(ptr);
|
|
|
|
}
|
2000-05-15 04:37:27 +00:00
|
|
|
|
2000-08-10 07:58:44 +00:00
|
|
|
#ifdef G_HAVE_GINT64
|
|
|
|
guint64
|
|
|
|
tvb_get_letohll(tvbuff_t *tvb, gint offset)
|
2000-05-15 04:37:27 +00:00
|
|
|
{
|
|
|
|
guint8* ptr;
|
|
|
|
|
2000-08-10 07:58:44 +00:00
|
|
|
ptr = ensure_contiguous(tvb, offset, sizeof(guint64));
|
|
|
|
return pletohll(ptr);
|
2000-05-15 04:37:27 +00:00
|
|
|
}
|
2000-08-10 07:58:44 +00:00
|
|
|
#endif
|
2000-08-30 02:50:18 +00:00
|
|
|
|
|
|
|
|
|
|
|
/* Find first occurence of needle in tvbuff, starting at offset. Searches
|
2000-11-10 09:15:57 +00:00
|
|
|
* at most maxlength number of bytes; if maxlength is -1, searches to
|
|
|
|
* end of tvbuff.
|
|
|
|
* Returns the offset of the found needle, or -1 if not found.
|
|
|
|
* Will not throw an exception, even if maxlength exceeds boundary of tvbuff;
|
|
|
|
* in that case, -1 will be returned if the boundary is reached before
|
|
|
|
* finding needle. */
|
2000-08-30 02:50:18 +00:00
|
|
|
gint
|
|
|
|
tvb_find_guint8(tvbuff_t *tvb, gint offset, guint maxlength, guint8 needle)
|
|
|
|
{
|
|
|
|
const guint8 *result;
|
2000-11-10 09:15:57 +00:00
|
|
|
guint abs_offset, junk_length;
|
|
|
|
guint tvbufflen;
|
2000-08-30 02:50:18 +00:00
|
|
|
guint limit;
|
|
|
|
|
|
|
|
check_offset_length(tvb, offset, 0, &abs_offset, &junk_length);
|
|
|
|
|
|
|
|
/* Only search to end of tvbuff, w/o throwing exception. */
|
2000-11-10 09:15:57 +00:00
|
|
|
tvbufflen = tvb_length_remaining(tvb, abs_offset);
|
|
|
|
if (maxlength == -1) {
|
2000-11-30 06:11:32 +00:00
|
|
|
/* No maximum length specified; search to end of tvbuff. */
|
2000-11-10 09:15:57 +00:00
|
|
|
limit = tvbufflen;
|
|
|
|
}
|
|
|
|
else if (tvbufflen < maxlength) {
|
2000-11-30 06:11:32 +00:00
|
|
|
/* Maximum length goes past end of tvbuff; search to end
|
|
|
|
of tvbuff. */
|
|
|
|
limit = tvbufflen;
|
2000-08-30 02:50:18 +00:00
|
|
|
}
|
|
|
|
else {
|
2000-11-30 06:11:32 +00:00
|
|
|
/* Maximum length doesn't go past end of tvbuff; search
|
|
|
|
to that value. */
|
2000-08-30 02:50:18 +00:00
|
|
|
limit = maxlength;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* If we have real data, perform our search now. */
|
|
|
|
if (tvb->real_data) {
|
|
|
|
result = guint8_find(tvb->real_data + abs_offset, limit, needle);
|
|
|
|
if (result == NULL) {
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
return result - tvb->real_data;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
switch(tvb->type) {
|
|
|
|
case TVBUFF_REAL_DATA:
|
|
|
|
g_assert_not_reached();
|
|
|
|
|
|
|
|
case TVBUFF_SUBSET:
|
|
|
|
return tvb_find_guint8(tvb->tvbuffs.subset.tvb,
|
|
|
|
abs_offset - tvb->tvbuffs.subset.offset,
|
|
|
|
limit, needle);
|
|
|
|
|
|
|
|
case TVBUFF_COMPOSITE:
|
|
|
|
g_assert_not_reached();
|
|
|
|
/* XXX - return composite_find_guint8(tvb, offset, limit, needle); */
|
|
|
|
}
|
|
|
|
|
|
|
|
g_assert_not_reached();
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2000-11-10 06:50:37 +00:00
|
|
|
/* Find first occurence of any of the needles in tvbuff, starting at offset.
|
2000-11-10 09:15:57 +00:00
|
|
|
* Searches at most maxlength number of bytes; if maxlength is -1, searches
|
|
|
|
* to end of tvbuff.
|
|
|
|
* Returns the offset of the found needle, or -1 if not found.
|
|
|
|
* Will not throw an exception, even if maxlength exceeds boundary of tvbuff;
|
|
|
|
* in that case, -1 will be returned if the boundary is reached before
|
|
|
|
* finding needle. */
|
2000-11-10 06:50:37 +00:00
|
|
|
gint
|
|
|
|
tvb_pbrk_guint8(tvbuff_t *tvb, gint offset, guint maxlength, guint8 *needles)
|
|
|
|
{
|
|
|
|
const guint8 *result;
|
2000-11-10 09:15:57 +00:00
|
|
|
guint abs_offset, junk_length;
|
|
|
|
guint tvbufflen;
|
2000-11-10 06:50:37 +00:00
|
|
|
guint limit;
|
|
|
|
|
|
|
|
check_offset_length(tvb, offset, 0, &abs_offset, &junk_length);
|
|
|
|
|
|
|
|
/* Only search to end of tvbuff, w/o throwing exception. */
|
2000-11-10 09:15:57 +00:00
|
|
|
tvbufflen = tvb_length_remaining(tvb, abs_offset);
|
|
|
|
if (maxlength == -1) {
|
2000-11-30 06:11:32 +00:00
|
|
|
/* No maximum length specified; search to end of tvbuff. */
|
2000-11-10 09:15:57 +00:00
|
|
|
limit = tvbufflen;
|
|
|
|
}
|
|
|
|
else if (tvbufflen < maxlength) {
|
2000-11-30 06:11:32 +00:00
|
|
|
/* Maximum length goes past end of tvbuff; search to end
|
|
|
|
of tvbuff. */
|
|
|
|
limit = tvbufflen;
|
2000-11-10 06:50:37 +00:00
|
|
|
}
|
|
|
|
else {
|
2000-11-30 06:11:32 +00:00
|
|
|
/* Maximum length doesn't go past end of tvbuff; search
|
|
|
|
to that value. */
|
2000-11-10 06:50:37 +00:00
|
|
|
limit = maxlength;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* If we have real data, perform our search now. */
|
|
|
|
if (tvb->real_data) {
|
|
|
|
result = guint8_pbrk(tvb->real_data + abs_offset, limit, needles);
|
|
|
|
if (result == NULL) {
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
return result - tvb->real_data;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
switch(tvb->type) {
|
|
|
|
case TVBUFF_REAL_DATA:
|
|
|
|
g_assert_not_reached();
|
|
|
|
|
|
|
|
case TVBUFF_SUBSET:
|
|
|
|
return tvb_pbrk_guint8(tvb->tvbuffs.subset.tvb,
|
|
|
|
abs_offset - tvb->tvbuffs.subset.offset,
|
|
|
|
limit, needles);
|
|
|
|
|
|
|
|
case TVBUFF_COMPOSITE:
|
|
|
|
g_assert_not_reached();
|
|
|
|
/* XXX - return composite_pbrk_guint8(tvb, offset, limit, needle); */
|
|
|
|
}
|
|
|
|
|
|
|
|
g_assert_not_reached();
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2000-12-25 23:48:16 +00:00
|
|
|
/* Find size of stringz (NUL-terminated string) by looking for terminating
|
|
|
|
* NUL. The size of the string includes the terminating NUL.
|
|
|
|
*
|
|
|
|
* If the NUL isn't found, it throws the appropriate exception.
|
|
|
|
*/
|
|
|
|
guint
|
|
|
|
tvb_strsize(tvbuff_t *tvb, gint offset)
|
|
|
|
{
|
|
|
|
guint abs_offset, junk_length;
|
|
|
|
gint nul_offset;
|
|
|
|
|
|
|
|
check_offset_length(tvb, offset, 0, &abs_offset, &junk_length);
|
|
|
|
nul_offset = tvb_find_guint8(tvb, abs_offset, -1, 0);
|
|
|
|
if (nul_offset == -1) {
|
|
|
|
/*
|
|
|
|
* OK, we hit the end of the tvbuff, so we should throw
|
|
|
|
* an exception.
|
|
|
|
*
|
|
|
|
* Did we hit the end of the captured data, or the end
|
|
|
|
* of the actual data? If there's less captured data
|
|
|
|
* than actual data, we presumably hit the end of the
|
|
|
|
* captured data, otherwise we hit the end of the actual
|
|
|
|
* data.
|
|
|
|
*/
|
|
|
|
if (tvb_length(tvb) < tvb_reported_length(tvb)) {
|
|
|
|
THROW(BoundsError);
|
|
|
|
} else {
|
|
|
|
THROW(ReportedBoundsError);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return (nul_offset - abs_offset) + 1;
|
|
|
|
}
|
|
|
|
|
2000-08-30 02:50:18 +00:00
|
|
|
/* Find length of string by looking for end of string ('\0'), up to
|
2000-11-10 09:15:57 +00:00
|
|
|
* 'maxlength' characters'; if 'maxlength' is -1, searches to end
|
|
|
|
* of tvbuff.
|
|
|
|
* Returns -1 if 'maxlength' reached before finding EOS. */
|
2000-09-07 15:29:40 +00:00
|
|
|
gint
|
|
|
|
tvb_strnlen(tvbuff_t *tvb, gint offset, guint maxlength)
|
2000-08-30 02:50:18 +00:00
|
|
|
{
|
|
|
|
gint result_offset;
|
|
|
|
guint abs_offset, junk_length;
|
|
|
|
|
|
|
|
check_offset_length(tvb, offset, 0, &abs_offset, &junk_length);
|
|
|
|
|
|
|
|
result_offset = tvb_find_guint8(tvb, abs_offset, maxlength, 0);
|
|
|
|
|
|
|
|
if (result_offset == -1) {
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
else {
|
2000-10-17 08:50:57 +00:00
|
|
|
return result_offset - abs_offset;
|
2000-08-30 02:50:18 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2000-09-07 13:00:12 +00:00
|
|
|
/*
|
|
|
|
* Implement strneql etc
|
|
|
|
*/
|
|
|
|
|
2001-07-02 07:11:40 +00:00
|
|
|
/*
|
|
|
|
* Call strncmp after checking if enough chars left, returning 0 if
|
|
|
|
* it returns 0 (meaning "equal") and -1 otherwise, otherwise return -1.
|
|
|
|
*/
|
2000-09-07 15:29:40 +00:00
|
|
|
gint
|
2000-11-11 19:55:48 +00:00
|
|
|
tvb_strneql(tvbuff_t *tvb, gint offset, const guint8 *str, gint size)
|
2000-09-07 13:00:12 +00:00
|
|
|
{
|
2000-11-09 10:56:33 +00:00
|
|
|
guint8 *ptr;
|
2000-09-07 13:00:12 +00:00
|
|
|
|
2000-11-09 10:56:33 +00:00
|
|
|
ptr = ensure_contiguous(tvb, offset, size);
|
2000-09-07 13:00:12 +00:00
|
|
|
|
2000-11-09 10:56:33 +00:00
|
|
|
if (ptr) {
|
|
|
|
int cmp = strncmp(ptr, str, size);
|
2000-09-07 13:00:12 +00:00
|
|
|
|
2000-11-09 10:56:33 +00:00
|
|
|
/*
|
|
|
|
* Return 0 if equal, -1 otherwise.
|
|
|
|
*/
|
|
|
|
return (cmp == 0 ? 0 : -1);
|
|
|
|
} else {
|
|
|
|
/*
|
|
|
|
* Not enough characters in the tvbuff to match the
|
|
|
|
* string.
|
|
|
|
*/
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
}
|
2000-09-07 13:00:12 +00:00
|
|
|
|
2001-07-02 07:11:40 +00:00
|
|
|
/*
|
|
|
|
* Call strncasecmp after checking if enough chars left, returning 0 if
|
|
|
|
* it returns 0 (meaning "equal") and -1 otherwise, otherwise return -1.
|
|
|
|
*/
|
2000-11-09 10:56:33 +00:00
|
|
|
gint
|
2000-11-11 19:55:48 +00:00
|
|
|
tvb_strncaseeql(tvbuff_t *tvb, gint offset, const guint8 *str, gint size)
|
2000-11-09 10:56:33 +00:00
|
|
|
{
|
|
|
|
guint8 *ptr;
|
2000-09-07 13:00:12 +00:00
|
|
|
|
2000-11-09 10:56:33 +00:00
|
|
|
ptr = ensure_contiguous(tvb, offset, size);
|
2000-09-07 13:00:12 +00:00
|
|
|
|
2000-11-09 10:56:33 +00:00
|
|
|
if (ptr) {
|
|
|
|
int cmp = strncasecmp(ptr, str, size);
|
2000-09-07 13:00:12 +00:00
|
|
|
|
2000-11-09 10:56:33 +00:00
|
|
|
/*
|
|
|
|
* Return 0 if equal, -1 otherwise.
|
|
|
|
*/
|
|
|
|
return (cmp == 0 ? 0 : -1);
|
|
|
|
} else {
|
|
|
|
/*
|
|
|
|
* Not enough characters in the tvbuff to match the
|
|
|
|
* string.
|
|
|
|
*/
|
|
|
|
return -1;
|
|
|
|
}
|
2000-09-07 13:00:12 +00:00
|
|
|
}
|
2000-08-30 02:50:18 +00:00
|
|
|
|
2001-07-02 07:11:40 +00:00
|
|
|
/*
|
|
|
|
* Call memcmp after checking if enough chars left, returning 0 if
|
|
|
|
* it returns 0 (meaning "equal") and -1 otherwise, otherwise return -1.
|
|
|
|
*/
|
|
|
|
gint
|
|
|
|
tvb_memeql(tvbuff_t *tvb, gint offset, const guint8 *str, gint size)
|
|
|
|
{
|
|
|
|
guint8 *ptr;
|
|
|
|
|
|
|
|
ptr = ensure_contiguous(tvb, offset, size);
|
|
|
|
|
|
|
|
if (ptr) {
|
|
|
|
int cmp = memcmp(ptr, str, size);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Return 0 if equal, -1 otherwise.
|
|
|
|
*/
|
|
|
|
return (cmp == 0 ? 0 : -1);
|
|
|
|
} else {
|
|
|
|
/*
|
|
|
|
* Not enough characters in the tvbuff to match the
|
|
|
|
* string.
|
|
|
|
*/
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2000-09-08 06:16:58 +00:00
|
|
|
/*
|
|
|
|
* Format the data in the tvb from offset for length ...
|
|
|
|
*/
|
|
|
|
|
|
|
|
guint8 *
|
|
|
|
tvb_format_text(tvbuff_t *tvb, gint offset, gint size)
|
|
|
|
{
|
|
|
|
guint8 *ptr;
|
|
|
|
gint len = size;
|
|
|
|
|
|
|
|
if ((ptr = ensure_contiguous(tvb, offset, size)) == NULL) {
|
|
|
|
|
|
|
|
len = tvb_length_remaining(tvb, offset);
|
|
|
|
ptr = ensure_contiguous(tvb, offset, len);
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
return format_text(ptr, len);
|
|
|
|
|
|
|
|
}
|
|
|
|
|
2000-08-30 02:50:18 +00:00
|
|
|
/* Looks for a stringz (NUL-terminated string) in tvbuff and copies
|
|
|
|
* no more than maxlength number of bytes, including terminating NUL, to buffer.
|
|
|
|
* Returns length of string (not including terminating NUL), or -1 if the string was
|
|
|
|
* truncated in the buffer due to not having reached the terminating NUL.
|
|
|
|
* In this way, it acts like snprintf().
|
|
|
|
*/
|
|
|
|
gint
|
|
|
|
tvb_get_nstringz(tvbuff_t *tvb, gint offset, guint maxlength, guint8* buffer)
|
|
|
|
{
|
2000-10-17 08:50:57 +00:00
|
|
|
gint stringlen;
|
2000-08-30 02:50:18 +00:00
|
|
|
guint abs_offset, junk_length;
|
|
|
|
gint limit;
|
|
|
|
|
|
|
|
check_offset_length(tvb, offset, 0, &abs_offset, &junk_length);
|
|
|
|
|
|
|
|
if (maxlength == 0) {
|
|
|
|
buffer[0] = 0;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Only copy to end of tvbuff, w/o throwing exception. */
|
|
|
|
if (tvb_length_remaining(tvb, abs_offset) < maxlength) {
|
|
|
|
limit = maxlength - (tvb_length(tvb) - abs_offset);
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
limit = maxlength;
|
|
|
|
}
|
|
|
|
|
2000-10-17 08:50:57 +00:00
|
|
|
stringlen = tvb_strnlen(tvb, abs_offset, limit);
|
2000-08-30 02:50:18 +00:00
|
|
|
|
|
|
|
/* If NUL wasn't found, copy the data and return -1 */
|
2000-10-17 08:50:57 +00:00
|
|
|
if (stringlen == -1) {
|
2000-08-30 02:50:18 +00:00
|
|
|
tvb_memcpy(tvb, buffer, abs_offset, limit);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Copy the string to buffer */
|
|
|
|
tvb_memcpy(tvb, buffer, abs_offset, stringlen + 1);
|
|
|
|
return stringlen;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Like tvb_get_nstringz(), but never returns -1. The string is guaranteed to
|
|
|
|
* have a terminating NUL. If the string was truncated when copied into buffer,
|
|
|
|
* a NUL is placed at the end of buffer to terminate it.
|
|
|
|
*/
|
|
|
|
gint
|
|
|
|
tvb_get_nstringz0(tvbuff_t *tvb, gint offset, guint maxlength, guint8* buffer)
|
|
|
|
{
|
|
|
|
gint len;
|
|
|
|
|
|
|
|
len = tvb_get_nstringz(tvb, offset, maxlength, buffer);
|
|
|
|
|
|
|
|
if (len == -1) {
|
|
|
|
buffer[maxlength] = 0;
|
|
|
|
return maxlength - 1;
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
return len;
|
|
|
|
}
|
|
|
|
}
|
2000-11-09 10:56:33 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Given a tvbuff, an offset into the tvbuff, and a length that starts
|
|
|
|
* at that offset (which may be -1 for "all the way to the end of the
|
|
|
|
* tvbuff"), find the end of the (putative) line that starts at the
|
|
|
|
* specified offset in the tvbuff, going no further than the specified
|
|
|
|
* length.
|
|
|
|
*
|
|
|
|
* Return the length of the line (not counting the line terminator at
|
|
|
|
* the end), or the amount of data remaining in the buffer if we don't
|
|
|
|
* find a line terminator.
|
|
|
|
*
|
|
|
|
* Set "*next_offset" to the offset of the character past the line
|
|
|
|
* terminator, or past the end of the buffer if we don't find a line
|
|
|
|
* terminator.
|
|
|
|
*/
|
2000-11-10 06:50:37 +00:00
|
|
|
gint
|
2000-11-09 10:56:33 +00:00
|
|
|
tvb_find_line_end(tvbuff_t *tvb, gint offset, int len, gint *next_offset)
|
|
|
|
{
|
|
|
|
gint eob_offset;
|
|
|
|
gint eol_offset;
|
|
|
|
int linelen;
|
|
|
|
|
|
|
|
if (len == -1)
|
|
|
|
len = tvb_length_remaining(tvb, offset);
|
|
|
|
/*
|
|
|
|
* XXX - what if "len" is still -1, meaning "offset is past the
|
|
|
|
* end of the tvbuff"?
|
|
|
|
*/
|
|
|
|
eob_offset = offset + len;
|
|
|
|
|
2000-11-12 00:59:09 +00:00
|
|
|
/*
|
|
|
|
* Look either for a CR or an LF.
|
|
|
|
*/
|
|
|
|
eol_offset = tvb_pbrk_guint8(tvb, offset, len, "\r\n");
|
2000-11-09 10:56:33 +00:00
|
|
|
if (eol_offset == -1) {
|
|
|
|
/*
|
2000-11-12 00:59:09 +00:00
|
|
|
* No CR or LF - line is presumably continued in next packet.
|
2000-11-09 10:56:33 +00:00
|
|
|
* We pretend the line runs to the end of the tvbuff.
|
|
|
|
*/
|
|
|
|
linelen = eob_offset - offset;
|
2000-11-10 06:50:37 +00:00
|
|
|
*next_offset = eob_offset;
|
2000-11-09 10:56:33 +00:00
|
|
|
} else {
|
|
|
|
/*
|
|
|
|
* Find the number of bytes between the starting offset
|
2000-11-12 00:59:09 +00:00
|
|
|
* and the CR or LF.
|
2000-11-09 10:56:33 +00:00
|
|
|
*/
|
|
|
|
linelen = eol_offset - offset;
|
|
|
|
|
|
|
|
/*
|
2000-11-12 00:59:09 +00:00
|
|
|
* Is it a CR?
|
2000-11-09 10:56:33 +00:00
|
|
|
*/
|
2000-11-12 00:59:09 +00:00
|
|
|
if (tvb_get_guint8(tvb, eol_offset) == '\r') {
|
2000-11-09 10:56:33 +00:00
|
|
|
/*
|
2000-11-12 00:59:09 +00:00
|
|
|
* Yes - is it followed by an LF?
|
2000-11-09 10:56:33 +00:00
|
|
|
*/
|
2000-11-12 00:59:09 +00:00
|
|
|
if (eol_offset + 1 < eob_offset &&
|
|
|
|
tvb_get_guint8(tvb, eol_offset + 1) == '\n') {
|
2000-11-09 10:56:33 +00:00
|
|
|
/*
|
2000-11-12 00:59:09 +00:00
|
|
|
* Yes; skip over the CR.
|
2000-11-09 10:56:33 +00:00
|
|
|
*/
|
2000-11-12 00:59:09 +00:00
|
|
|
eol_offset++;
|
2000-11-09 10:56:33 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2000-11-10 06:50:37 +00:00
|
|
|
* Return the offset of the character after the last
|
2000-11-12 00:59:09 +00:00
|
|
|
* character in the line, skipping over the last character
|
|
|
|
* in the line terminator.
|
2000-11-10 06:50:37 +00:00
|
|
|
*/
|
|
|
|
*next_offset = eol_offset + 1;
|
|
|
|
}
|
|
|
|
return linelen;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Given a tvbuff, an offset into the tvbuff, and a length that starts
|
|
|
|
* at that offset (which may be -1 for "all the way to the end of the
|
|
|
|
* tvbuff"), find the end of the (putative) line that starts at the
|
|
|
|
* specified offset in the tvbuff, going no further than the specified
|
|
|
|
* length.
|
|
|
|
*
|
|
|
|
* However, treat quoted strings inside the buffer specially - don't
|
|
|
|
* treat newlines in quoted strings as line terminators.
|
|
|
|
*
|
|
|
|
* Return the length of the line (not counting the line terminator at
|
|
|
|
* the end), or the amount of data remaining in the buffer if we don't
|
|
|
|
* find a line terminator.
|
|
|
|
*
|
|
|
|
* Set "*next_offset" to the offset of the character past the line
|
|
|
|
* terminator, or past the end of the buffer if we don't find a line
|
|
|
|
* terminator.
|
|
|
|
*/
|
|
|
|
gint
|
|
|
|
tvb_find_line_end_unquoted(tvbuff_t *tvb, gint offset, int len,
|
|
|
|
gint *next_offset)
|
|
|
|
{
|
|
|
|
gint cur_offset, char_offset;
|
|
|
|
gboolean is_quoted;
|
|
|
|
u_char c;
|
|
|
|
gint eob_offset;
|
|
|
|
int linelen;
|
|
|
|
|
|
|
|
if (len == -1)
|
|
|
|
len = tvb_length_remaining(tvb, offset);
|
|
|
|
/*
|
|
|
|
* XXX - what if "len" is still -1, meaning "offset is past the
|
|
|
|
* end of the tvbuff"?
|
|
|
|
*/
|
|
|
|
eob_offset = offset + len;
|
|
|
|
|
|
|
|
cur_offset = offset;
|
|
|
|
is_quoted = FALSE;
|
|
|
|
for (;;) {
|
|
|
|
/*
|
|
|
|
* Is this part of the string quoted?
|
|
|
|
*/
|
|
|
|
if (is_quoted) {
|
|
|
|
/*
|
|
|
|
* Yes - look only for the terminating quote.
|
|
|
|
*/
|
|
|
|
char_offset = tvb_find_guint8(tvb, cur_offset, len,
|
|
|
|
'"');
|
|
|
|
} else {
|
|
|
|
/*
|
2000-11-12 00:59:09 +00:00
|
|
|
* Look either for a CR, an LF, or a '"'.
|
2000-11-10 06:50:37 +00:00
|
|
|
*/
|
|
|
|
char_offset = tvb_pbrk_guint8(tvb, cur_offset, len,
|
2000-11-12 00:59:09 +00:00
|
|
|
"\r\n\"");
|
2000-11-10 06:50:37 +00:00
|
|
|
}
|
2000-11-30 06:11:32 +00:00
|
|
|
if (char_offset == -1) {
|
2000-11-10 06:50:37 +00:00
|
|
|
/*
|
|
|
|
* Not found - line is presumably continued in
|
|
|
|
* next packet.
|
|
|
|
* We pretend the line runs to the end of the tvbuff.
|
|
|
|
*/
|
|
|
|
linelen = eob_offset - offset;
|
|
|
|
*next_offset = eob_offset;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2000-11-12 00:59:09 +00:00
|
|
|
if (is_quoted) {
|
|
|
|
/*
|
|
|
|
* We're processing a quoted string.
|
|
|
|
* We only looked for ", so we know it's a ";
|
|
|
|
* as we're processing a quoted string, it's a
|
|
|
|
* closing quote.
|
|
|
|
*/
|
|
|
|
is_quoted = FALSE;
|
|
|
|
} else {
|
|
|
|
/*
|
|
|
|
* OK, what is it?
|
|
|
|
*/
|
|
|
|
c = tvb_get_guint8(tvb, char_offset);
|
|
|
|
if (c == '"') {
|
2000-11-10 06:50:37 +00:00
|
|
|
/*
|
2000-11-12 00:59:09 +00:00
|
|
|
* Un-quoted "; it begins a quoted
|
|
|
|
* string.
|
2000-11-10 06:50:37 +00:00
|
|
|
*/
|
2000-11-12 00:59:09 +00:00
|
|
|
is_quoted = TRUE;
|
2000-11-10 06:50:37 +00:00
|
|
|
} else {
|
|
|
|
/*
|
2000-11-12 00:59:09 +00:00
|
|
|
* It's a CR or LF; we've found a line
|
|
|
|
* terminator.
|
|
|
|
*
|
2000-11-10 06:50:37 +00:00
|
|
|
* Find the number of bytes between the
|
2000-11-12 00:59:09 +00:00
|
|
|
* starting offset and the CR or LF.
|
2000-11-10 06:50:37 +00:00
|
|
|
*/
|
|
|
|
linelen = char_offset - offset;
|
|
|
|
|
|
|
|
/*
|
2000-11-12 00:59:09 +00:00
|
|
|
* Is it a CR?
|
2000-11-10 06:50:37 +00:00
|
|
|
*/
|
2000-11-12 00:59:09 +00:00
|
|
|
if (c == '\r') {
|
2000-11-10 06:50:37 +00:00
|
|
|
/*
|
2000-11-12 00:59:09 +00:00
|
|
|
* Yes; is it followed by an LF?
|
2000-11-10 06:50:37 +00:00
|
|
|
*/
|
2000-11-12 00:59:09 +00:00
|
|
|
if (char_offset + 1 < eob_offset &&
|
|
|
|
tvb_get_guint8(tvb, char_offset + 1)
|
|
|
|
== '\n') {
|
2000-11-10 06:50:37 +00:00
|
|
|
/*
|
2000-11-12 00:59:09 +00:00
|
|
|
* Yes; skip over the CR.
|
2000-11-10 06:50:37 +00:00
|
|
|
*/
|
2000-11-12 00:59:09 +00:00
|
|
|
char_offset++;
|
2000-11-10 06:50:37 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Return the offset of the character after
|
2000-11-12 00:59:09 +00:00
|
|
|
* the last character in the line, skipping
|
|
|
|
* over the last character in the line
|
|
|
|
* terminator, and quit.
|
2000-11-10 06:50:37 +00:00
|
|
|
*/
|
|
|
|
*next_offset = char_offset + 1;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Step past the character we found.
|
2000-11-09 10:56:33 +00:00
|
|
|
*/
|
2000-11-10 06:50:37 +00:00
|
|
|
cur_offset = char_offset + 1;
|
|
|
|
if (cur_offset >= eob_offset) {
|
|
|
|
/*
|
|
|
|
* The character we found was the last character
|
|
|
|
* in the tvbuff - line is presumably continued in
|
|
|
|
* next packet.
|
|
|
|
* We pretend the line runs to the end of the tvbuff.
|
|
|
|
*/
|
|
|
|
linelen = eob_offset - offset;
|
|
|
|
*next_offset = eob_offset;
|
|
|
|
break;
|
|
|
|
}
|
2000-11-09 10:56:33 +00:00
|
|
|
}
|
|
|
|
return linelen;
|
|
|
|
}
|
2000-11-13 07:19:37 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Format a bunch of data from a tvbuff as bytes, returning a pointer
|
|
|
|
* to the string with the formatted data.
|
|
|
|
*/
|
|
|
|
gchar *
|
|
|
|
tvb_bytes_to_str(tvbuff_t *tvb, gint offset, gint len)
|
|
|
|
{
|
|
|
|
return bytes_to_str(tvb_get_ptr(tvb, offset, len), len);
|
|
|
|
}
|
2001-03-23 14:44:04 +00:00
|
|
|
|
|
|
|
gchar*
|
|
|
|
tvb_get_name(tvbuff_t* tvb)
|
|
|
|
{
|
|
|
|
return tvb->ds_name;
|
|
|
|
}
|