forked from osmocom/wireshark
140 lines
4.0 KiB
C++
140 lines
4.0 KiB
C++
/* capture_filter_syntax_worker.cpp
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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 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#ifdef HAVE_LIBPCAP
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#include <glib.h>
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#include <pcap.h>
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#include "capture_opts.h"
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#include "ui/capture_globals.h"
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#endif
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#include "capture_filter_syntax_worker.h"
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#include <QMutexLocker>
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#include <QSet>
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// Must be global
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static QMutex pcap_compile_mtx_;
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#if 0
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#include <QDebug>
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#include <QThread>
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#define DEBUG_SYNTAX_CHECK(state1, state2) qDebug() << "CF state" << QThread::currentThreadId() << state1 << "->" << state2 << ":" << filter_text_ << ":" << filter
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#else
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#define DEBUG_SYNTAX_CHECK(state1, state2)
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#endif
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#define DUMMY_SNAPLENGTH 65535
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#define DUMMY_NETMASK 0xFF000000
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void CaptureFilterSyntaxWorker::start() {
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#ifdef HAVE_LIBPCAP
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forever {
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QString filter;
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QSet<gint> active_dlts;
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struct bpf_program fcode;
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pcap_t *pd;
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int pc_err;
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bool ok = true;
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QString err_str;
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data_mtx_.lock();
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while (filter_text_.isEmpty()) {
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data_cond_.wait(&data_mtx_);
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}
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DEBUG_SYNTAX_CHECK("pending", "unknown");
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filter = filter_text_;
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filter_text_ = QString();
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data_mtx_.unlock();
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if (global_capture_opts.num_selected < 1) {
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emit syntaxResult(filter, false, QString("No interfaces selected"));
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DEBUG_SYNTAX_CHECK("unknown", "no interfaces");
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continue;
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}
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for (guint if_idx = 0; if_idx < global_capture_opts.all_ifaces->len; if_idx++) {
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interface_t device;
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device = g_array_index(global_capture_opts.all_ifaces, interface_t, if_idx);
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if (!device.locked && device.selected) {
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active_dlts.insert(device.active_dlt);
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}
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}
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foreach (gint dlt, active_dlts.toList()) {
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pcap_compile_mtx_.lock();
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pd = pcap_open_dead(dlt, DUMMY_SNAPLENGTH);
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#ifdef PCAP_NETMASK_UNKNOWN
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pc_err = pcap_compile(pd, &fcode, filter.toUtf8().constData(), 1 /* Do optimize */, PCAP_NETMASK_UNKNOWN);
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#else
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pc_err = pcap_compile(pd, &fcode, filter.toUtf8().constData(), 1 /* Do optimize */, 0);
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#endif
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if (pc_err) {
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DEBUG_SYNTAX_CHECK("unknown", "known bad");
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ok = false;
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err_str = pcap_geterr(pd);
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} else {
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DEBUG_SYNTAX_CHECK("unknown", "known good");
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}
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pcap_close(pd);
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pcap_compile_mtx_.unlock();
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if (!ok) break;
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}
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emit syntaxResult(filter, ok, err_str);
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DEBUG_SYNTAX_CHECK("known", "idle");
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}
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#endif // HAVE_LIBPCAP
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}
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void CaptureFilterSyntaxWorker::checkFilter(const QString &filter)
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{
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#ifdef HAVE_LIBPCAP
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QMutexLocker ml(&data_mtx_);
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/* Ruthlessly clobber the current state. */
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filter_text_ = filter;
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DEBUG_SYNTAX_CHECK("received", "?");
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data_cond_.wakeOne();
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#else
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emit syntaxResult(filter, true, QString("Syntax checking unavailable"));
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#endif // HAVE_LIBPCAP
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}
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/*
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* Editor modelines
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*
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* Local Variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* ex: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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