forked from osmocom/wireshark
d15724fc9e
svn path=/trunk/; revision=11869
242 lines
6.1 KiB
C
242 lines
6.1 KiB
C
/*
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* $Id$
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 2001 Gerald Combs
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*
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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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/* Perl-Compatible Regular Expression (PCRE) internal field type.
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* Used with the "matches" dfilter operator, allowing efficient
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* compilation and studying of a PCRE pattern in dfilters.
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*
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* PCRE is provided with libpcre (http://www.pcre.org/).
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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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#ifdef HAVE_LIBPCRE
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#include <pcre.h>
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/* Create a pcre_tuple_t object based on the given string pattern */
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static pcre_tuple_t *
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pcre_tuple_new(const char *value)
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{
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pcre_tuple_t *tuple;
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const char *pcre_error_text;
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int pcre_error_offset;
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tuple = g_malloc(sizeof(pcre_tuple_t));
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tuple->string = g_strdup(value); /* The RE as string */
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/* Compile the RE */
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tuple->re = pcre_compile(
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value, /* pattern */
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0, /* PCRE options */
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&pcre_error_text, /* PCRE constant error string */
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&pcre_error_offset, /* Start offset of error in pattern */
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NULL /* Default char tables (C locale) */
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);
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if (pcre_error_text) {
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tuple->error = g_strdup_printf("In regular expression \"%s\":\n"
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"%s (character position %d)",
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value, pcre_error_text, pcre_error_offset);
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return tuple;
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} else {
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tuple->error = NULL;
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}
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/* Study the RE */
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tuple->ex = pcre_study(tuple->re, 0, &pcre_error_text);
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if (pcre_error_text) {
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if (tuple->error) {
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tuple->error = g_strdup_printf("In regular expression \"%s\":\n"
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"%s. %s",
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value, tuple->error, pcre_error_text);
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} else {
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tuple->error = g_strdup_printf("In regular expression \"%s\":\n"
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"%s",
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value, pcre_error_text);
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}
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}
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return tuple;
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}
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static void
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pcre_tuple_free(pcre_tuple_t *tuple)
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{
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if (tuple) {
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if (tuple->string) g_free(tuple->string);
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if (tuple->re) g_free(tuple->re);
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if (tuple->ex) g_free(tuple->ex);
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if (tuple->error) g_free(tuple->error);
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g_free(tuple);
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}
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}
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static void
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pcre_fvalue_new(fvalue_t *fv)
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{
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fv->value.re = NULL;
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}
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static void
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pcre_fvalue_free(fvalue_t *fv)
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{
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if (fv->value.re) {
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pcre_tuple_free(fv->value.re);
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}
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}
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/* Generate a FT_PCRE from a parsed string pattern.
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* Uses the specified logfunc() to report errors. */
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static gboolean
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val_from_string(fvalue_t *fv, char *pattern, LogFunc logfunc)
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{
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/* Free up the old value, if we have one */
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pcre_fvalue_free(fv);
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fv->value.re = pcre_tuple_new(pattern);
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if (fv->value.re->error) {
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logfunc(fv->value.re->error);
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return FALSE;
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}
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return TRUE;
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}
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/* Generate a FT_PCRE from an unparsed string pattern.
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* Uses the specified logfunc() to report errors. */
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static gboolean
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val_from_unparsed(fvalue_t *fv, char *pattern, gboolean allow_partial_value _U_, LogFunc logfunc)
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{
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/* Free up the old value, if we have one */
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pcre_fvalue_free(fv);
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g_assert(! allow_partial_value);
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fv->value.re = pcre_tuple_new(pattern);
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if (fv->value.re->error) {
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logfunc(fv->value.re->error);
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return FALSE;
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}
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return TRUE;
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}
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/* BEHOLD - value contains the string representation of the regular expression,
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* and we want to store the compiled PCRE RE object into the value. */
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static void
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pcre_fvalue_set(fvalue_t *fv, gpointer value, gboolean already_copied)
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{
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g_assert(value != NULL);
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/* Free up the old value, if we have one */
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pcre_fvalue_free(fv);
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g_assert(! already_copied);
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fv->value.re = pcre_tuple_new(value);
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}
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static gpointer
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pcre_fvalue_get(fvalue_t *fv)
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{
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return fv->value.re;
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}
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void
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ftype_register_pcre(void)
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{
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static ftype_t pcre_type = {
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"FT_PCRE", /* name */
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"Compiled Perl-Compatible Regular Expression object", /* pretty_name */
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0, /* wire_size */
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pcre_fvalue_new, /* new_value */
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pcre_fvalue_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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NULL, /* val_to_string_repr */
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NULL, /* len_string_repr */
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pcre_fvalue_set, /* set_value */
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NULL, /* set_value_integer */
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NULL, /* set_value_integer64 */
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NULL, /* set_value_floating */
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pcre_fvalue_get, /* get_value */
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NULL, /* get_value_integer */
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NULL, /* get_value_integer64 */
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NULL, /* get_value_floating */
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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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NULL, /* cmp_contains */
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NULL, /* cmp_matches */
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NULL, /* len */
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NULL, /* slice */
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};
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ftype_register(FT_PCRE, &pcre_type);
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}
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#else /* HAVE_LIBPCRE */
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void
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ftype_register_pcre(void)
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{
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static ftype_t pcre_type = {
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"FT_PCRE", /* name */
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"Compiled Perl-Compatible Regular Expression object", /* pretty_name */
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0, /* wire_size */
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NULL, /* new_value */
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NULL, /* free_value */
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NULL, /* val_from_unparsed */
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NULL, /* val_from_string */
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NULL, /* val_to_string_repr */
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NULL, /* len_string_repr */
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NULL, /* set_value */
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NULL, /* set_value_integer */
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NULL, /* set_value_integer64 */
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NULL, /* set_value_floating */
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NULL, /* get_value */
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NULL, /* get_value_integer */
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NULL, /* get_value_integer64 */
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NULL, /* get_value_floating */
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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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NULL, /* cmp_contains */
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NULL, /* cmp_matches */
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NULL, /* len */
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NULL, /* slice */
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};
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ftype_register(FT_PCRE, &pcre_type);
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}
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#endif /* HAVE_LIBPCRE */
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