1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
/* capture_filter_syntax_worker.cpp
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#ifdef HAVE_LIBPCAP
#include <glib.h>
#include <pcap.h>
#include "capture_opts.h"
#include "ui/capture_globals.h"
#endif
#include "capture_filter_syntax_worker.h"
#include <QMutexLocker>
#include <QSet>
// Must be global
static QMutex pcap_compile_mtx_;
#if 0
#include <QDebug>
#include <QThread>
#define DEBUG_SYNTAX_CHECK(state1, state2) qDebug() << "CF state" << QThread::currentThreadId() << state1 << "->" << state2 << ":" << filter_text_ << ":" << filter
#else
#define DEBUG_SYNTAX_CHECK(state1, state2)
#endif
#define DUMMY_SNAPLENGTH 65535
#define DUMMY_NETMASK 0xFF000000
void CaptureFilterSyntaxWorker::start() {
#ifdef HAVE_LIBPCAP
forever {
QString filter;
QSet<gint> active_dlts;
struct bpf_program fcode;
pcap_t *pd;
int pc_err;
bool ok = true;
QString err_str;
data_mtx_.lock();
while (filter_text_.isEmpty()) {
data_cond_.wait(&data_mtx_);
}
DEBUG_SYNTAX_CHECK("pending", "unknown");
filter = filter_text_;
filter_text_ = QString();
data_mtx_.unlock();
if (global_capture_opts.num_selected < 1) {
emit syntaxResult(filter, false, QString("No interfaces selected"));
DEBUG_SYNTAX_CHECK("unknown", "no interfaces");
continue;
}
for (guint if_idx = 0; if_idx < global_capture_opts.all_ifaces->len; if_idx++) {
interface_t device;
device = g_array_index(global_capture_opts.all_ifaces, interface_t, if_idx);
if (!device.locked && device.selected) {
active_dlts.insert(device.active_dlt);
}
}
foreach (gint dlt, active_dlts.toList()) {
pcap_compile_mtx_.lock();
pd = pcap_open_dead(dlt, DUMMY_SNAPLENGTH);
#ifdef PCAP_NETMASK_UNKNOWN
pc_err = pcap_compile(pd, &fcode, filter.toUtf8().constData(), 1 /* Do optimize */, PCAP_NETMASK_UNKNOWN);
#else
pc_err = pcap_compile(pd, &fcode, filter.toUtf8().constData(), 1 /* Do optimize */, 0);
#endif
if (pc_err) {
DEBUG_SYNTAX_CHECK("unknown", "known bad");
ok = false;
err_str = pcap_geterr(pd);
} else {
DEBUG_SYNTAX_CHECK("unknown", "known good");
}
pcap_close(pd);
pcap_compile_mtx_.unlock();
if (!ok) break;
}
emit syntaxResult(filter, ok, err_str);
DEBUG_SYNTAX_CHECK("known", "idle");
}
#endif // HAVE_LIBPCAP
}
void CaptureFilterSyntaxWorker::checkFilter(const QString &filter)
{
#ifdef HAVE_LIBPCAP
QMutexLocker ml(&data_mtx_);
/* Ruthlessly clobber the current state. */
filter_text_ = filter;
DEBUG_SYNTAX_CHECK("received", "?");
data_cond_.wakeOne();
#else
emit syntaxResult(filter, true, QString("Syntax checking unavailable"));
#endif // HAVE_LIBPCAP
}
/*
* Editor modelines
*
* Local Variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
|
