307 lines
6.6 KiB
C
307 lines
6.6 KiB
C
/*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 2001 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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <ftypes-int.h>
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#include <string.h>
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#ifdef HAVE_LIBPCRE
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#include <pcre.h>
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#define CMP_MATCHES cmp_matches
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#else
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#define CMP_MATCHES NULL
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#endif
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#define tvb_is_private fvalue_gboolean1
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static void
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value_new(fvalue_t *fv)
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{
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fv->value.tvb = NULL;
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fv->tvb_is_private = FALSE;
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}
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static void
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value_free(fvalue_t *fv)
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{
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if (fv->value.tvb && fv->tvb_is_private) {
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tvb_free_chain(fv->value.tvb);
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}
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}
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static void
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value_set(fvalue_t *fv, gpointer value, gboolean already_copied)
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{
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g_assert(already_copied);
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/* Free up the old value, if we have one */
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value_free(fv);
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fv->value.tvb = value;
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}
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static void
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free_tvb_data(void *data)
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{
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g_free(data);
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}
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static gboolean
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val_from_string(fvalue_t *fv, char *s, LogFunc logfunc _U_)
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{
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tvbuff_t *new_tvb;
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guint8 *private_data;
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/* Free up the old value, if we have one */
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value_free(fv);
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/* Make a tvbuff from the string. We can drop the
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* terminating NUL. */
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private_data = g_memdup(s, strlen(s));
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new_tvb = tvb_new_real_data(private_data,
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strlen(s), strlen(s));
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/* Let the tvbuff know how to delete the data. */
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tvb_set_free_cb(new_tvb, free_tvb_data);
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/* And let us know that we need to free the tvbuff */
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fv->tvb_is_private = TRUE;
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fv->value.tvb = new_tvb;
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return TRUE;
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}
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static gboolean
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val_from_unparsed(fvalue_t *fv, char *s, gboolean allow_partial_value _U_, LogFunc logfunc)
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{
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fvalue_t *fv_bytes;
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tvbuff_t *new_tvb;
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guint8 *private_data;
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/* Free up the old value, if we have one */
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value_free(fv);
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/* Does this look like a byte string? */
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fv_bytes = fvalue_from_unparsed(FT_BYTES, s, TRUE, NULL);
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if (fv_bytes) {
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/* Make a tvbuff from the bytes */
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private_data = g_memdup(fv_bytes->value.bytes->data,
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fv_bytes->value.bytes->len);
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new_tvb = tvb_new_real_data(private_data,
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fv_bytes->value.bytes->len,
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fv_bytes->value.bytes->len);
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/* Let the tvbuff know how to delete the data. */
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tvb_set_free_cb(new_tvb, free_tvb_data);
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/* And let us know that we need to free the tvbuff */
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fv->tvb_is_private = TRUE;
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fv->value.tvb = new_tvb;
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return TRUE;
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}
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else {
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/* Treat it as a string. */
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return val_from_string(fv, s, logfunc);
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}
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g_assert_not_reached();
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}
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static int
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val_repr_len(fvalue_t *fv, ftrepr_t rtype)
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{
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guint length;
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g_assert(rtype == FTREPR_DFILTER);
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length = tvb_length(fv->value.tvb);
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/* 3 bytes for each byte of the byte "NN:" minus 1 byte
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* as there's no trailing ":". */
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return length * 3 - 1;
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}
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static void
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val_to_repr(fvalue_t *fv, ftrepr_t rtype, char *buf)
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{
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guint length;
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const guint8 *c;
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char *write_cursor;
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unsigned int i;
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g_assert(rtype == FTREPR_DFILTER);
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length = tvb_length(fv->value.tvb);
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c = tvb_get_ptr(fv->value.tvb, 0, length);
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write_cursor = buf;
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for (i = 0; i < length; i++) {
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if (i == 0) {
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sprintf(write_cursor, "%02x", *c++);
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write_cursor += 2;
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}
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else {
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sprintf(write_cursor, ":%02x", *c++);
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write_cursor += 3;
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}
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}
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}
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static gpointer
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value_get(fvalue_t *fv)
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{
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return fv->value.tvb;
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}
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static guint
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len(fvalue_t *fv)
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{
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if (fv->value.tvb)
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return tvb_length(fv->value.tvb);
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else
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return 0;
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}
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static void
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slice(fvalue_t *fv, GByteArray *bytes, guint offset, guint length)
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{
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const guint8* data;
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if (fv->value.tvb) {
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TRY {
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data = tvb_get_ptr(fv->value.tvb, offset, length);
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g_byte_array_append(bytes, data, length);
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}
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CATCH_ALL {
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/* nothing */
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}
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ENDTRY;
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}
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}
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static gboolean
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cmp_contains(fvalue_t *fv_a, fvalue_t *fv_b)
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{
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if (tvb_find_tvb(fv_a->value.tvb, fv_b->value.tvb, 0) > -1) {
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return TRUE;
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}
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else {
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return FALSE;
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}
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}
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#ifdef HAVE_LIBPCRE
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static gboolean
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cmp_matches(fvalue_t *fv_a, fvalue_t *fv_b)
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{
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tvbuff_t *tvb = fv_a->value.tvb;
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pcre_tuple_t *pcre = fv_b->value.re;
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int options = 0;
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volatile int rc = 1;
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const char *data = NULL; /* tvb data */
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guint32 tvb_len; /* tvb length */
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/* fv_b is always a FT_PCRE, otherwise the dfilter semcheck() would have
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* warned us. For the same reason (and because we're using g_malloc()),
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* fv_b->value.re is not NULL.
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*/
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if (strcmp(fv_b->ftype->name, "FT_PCRE") != 0) {
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return FALSE;
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}
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if (! pcre) {
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return FALSE;
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}
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TRY {
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tvb_len = tvb_length(tvb);
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data = (const char *)tvb_get_ptr(tvb, 0, tvb_len);
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rc = pcre_exec(
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pcre->re, /* Compiled PCRE */
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pcre->ex, /* PCRE extra from pcre_study() */
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data, /* The data to check for the pattern... */
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tvb_len, /* ... and its length */
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0, /* Start offset within data */
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options, /* PCRE options */
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NULL, /* We are not interested in the matched string */
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0 /* of the pattern; only in success or failure. */
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);
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/* NOTE - DO NOT g_free(data) */
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}
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CATCH_ALL {
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return FALSE;
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}
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ENDTRY;
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if (rc == 0) {
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return TRUE;
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}
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return FALSE;
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}
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#endif
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void
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ftype_register_tvbuff(void)
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{
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static ftype_t protocol_type = {
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FT_PROTOCOL, /* ftype */
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"FT_PROTOCOL", /* name */
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"protocol", /* pretty_name */
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0, /* wire_size */
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value_new, /* new_value */
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value_free, /* free_value */
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val_from_unparsed, /* val_from_unparsed */
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val_from_string, /* val_from_string */
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val_to_repr, /* val_to_string_repr */
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val_repr_len, /* len_string_repr */
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value_set, /* set_value */
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NULL, /* set_value_uinteger */
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NULL, /* set_value_sinteger */
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NULL, /* set_value_integer64 */
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NULL, /* set_value_floating */
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value_get, /* get_value */
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NULL, /* get_value_uinteger */
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NULL, /* get_value_sinteger */
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NULL, /* get_value_integer64 */
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NULL, /* get_value_floating */
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/* TODO - tvb's *can* do 'eq', etc. */
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NULL, /* cmp_eq */
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NULL, /* cmp_ne */
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NULL, /* cmp_gt */
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NULL, /* cmp_ge */
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NULL, /* cmp_lt */
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NULL, /* cmp_le */
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NULL, /* cmp_bitwise_and */
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cmp_contains,
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CMP_MATCHES,
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len,
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slice,
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};
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ftype_register(FT_PROTOCOL, &protocol_type);
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}
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