source: lib/format_helper.c @ b8d8186

4.0.1-hotfixescachetimestampsdevelopdpdk-ndagetsilivelibtrace4ndag_formatpfringrc-4.0.1rc-4.0.2rc-4.0.3rc-4.0.4ringdecrementfixringperformanceringtimestampfixes
Last change on this file since b8d8186 was b8d8186, checked in by Shane Alcock <salcock@…>, 6 years ago

Fix strangeness when using bogus filters on int:

Changes:

  • Make sure trace_start returns -1 for int: if the provided filter failed to compile, rather than falling through to using trace_apply_filter on the first packet (and failing). This is also more consistent with what pcapint: already does.
  • Check for -1 return value from trace_apply_filter, rather than treating -1 as a successful match.
  • Property mode set to 100644
File size: 9.0 KB
Line 
1/*
2 * This file is part of libtrace
3 *
4 * Copyright (c) 2007,2008,2009,2010 The University of Waikato, Hamilton,
5 * New Zealand.
6 *
7 * Authors: Daniel Lawson
8 *          Perry Lorier
9 *          Shane Alcock
10 *         
11 * All rights reserved.
12 *
13 * This code has been developed by the University of Waikato WAND
14 * research group. For further information please see http://www.wand.net.nz/
15 *
16 * libtrace is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
20 *
21 * libtrace is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with libtrace; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
29 *
30 * $Id$
31 *
32 */
33
34#include "config.h"
35#include <sys/types.h>
36#include <fcntl.h> /* for O_LARGEFILE */
37#include <math.h>
38#include "libtrace.h"
39#include "libtrace_int.h"
40#include "wandio.h"
41
42#include <stdlib.h>
43#include <stdio.h>
44#include <string.h>
45#include <errno.h>
46#include <time.h>
47#include "format_helper.h"
48
49#include <assert.h>
50#include <stdarg.h>
51
52#ifdef WIN32
53#  include <io.h>
54#  include <share.h>
55#  include <sys/timeb.h>
56
57struct libtrace_eventobj_t trace_event_device(struct libtrace_t *trace, struct libtrace_packet_t *packet) {
58    struct libtrace_eventobj_t event = {0,0,0.0,0};
59
60    trace_set_err(trace,TRACE_ERR_OPTION_UNAVAIL, "trace_event() is not "
61            "supported on devices under windows in this version");
62
63    event.type = TRACE_EVENT_TERMINATE;
64    return event;
65}
66#else
67#  include <sys/ioctl.h>
68
69/* Generic event function for live capture devices / interfaces */
70struct libtrace_eventobj_t trace_event_device(struct libtrace_t *trace, 
71                                        struct libtrace_packet_t *packet) {
72        struct libtrace_eventobj_t event = {0,0,0.0,0};
73
74        fd_set rfds, rfds_param;
75        int ret;
76        int max_fd;
77        struct timeval tv;
78
79        assert(trace != NULL);
80        assert(packet != NULL);
81       
82        FD_ZERO(&rfds);
83        FD_ZERO(&rfds_param);
84
85        if (trace->format->get_fd) {
86                event.fd = trace->format->get_fd(trace);
87                FD_SET(event.fd, &rfds);
88                max_fd = event.fd;
89        } else {
90                event.fd = 0;
91                max_fd = -1;
92        }
93
94        /* Use select() to perform a quick poll to check that there is data
95         * available - we used to use FIONREAD here but that does not work
96         * for mmapped pcap sockets. As recent pcap on linux (e.g. Ubuntu 9.04)
97         * uses mmapped sockets by default, I've switched over to this
98         * solution. */
99
100        do {
101                tv.tv_sec = 0;
102                tv.tv_usec = 0;
103                rfds_param = rfds;
104
105                ret = select(max_fd + 1, &rfds_param, NULL, NULL, &tv);
106                if (ret == -1 && errno != EINTR) {
107                        event.type = TRACE_EVENT_TERMINATE;
108                        return event;
109                }
110        } while (ret == -1);
111
112        if (FD_ISSET(event.fd, &rfds_param)) {
113                event.size = trace_read_packet(trace,packet);
114                if (event.size < 1) {
115                        /* Covers error and EOF events - terminate rather
116                         * than report a packet as available */
117                        if (trace_is_err(trace)) {
118                                trace_perror(trace, "read packet");
119                        }
120                        event.type = TRACE_EVENT_TERMINATE;
121                } else {
122
123                        event.type = TRACE_EVENT_PACKET;
124                }
125                return event;
126        }
127        event.type= TRACE_EVENT_IOWAIT;
128        return event;
129}
130#endif
131
132/* Generic event function for trace files */ 
133struct libtrace_eventobj_t trace_event_trace(struct libtrace_t *trace, struct libtrace_packet_t *packet) {
134        struct libtrace_eventobj_t event = {0,0,0.0,0};
135        double ts;
136        double now;
137#ifdef WIN32
138        struct __timeb64 tstruct;
139#else
140        struct timeval stv;
141#endif
142
143        if (!trace->event.packet) {
144                trace->event.packet = trace_create_packet();
145        }
146
147        if (!trace->event.waiting) {
148                /* There is no packet event waiting for us, so create a new
149                 * libtrace packet in the event structure and read the next
150                 * packet into that.
151                 *
152                 * If a SLEEP event is reported this time around, the read
153                 * packet can therefore be saved until the next time this
154                 * function is called. */
155
156                trace->event.psize=
157                        trace_read_packet(trace,trace->event.packet);
158                if (trace->event.psize<1) {
159                        /* Return here, the test for event.size will sort out
160                         * the error  */
161                        if (trace_is_err(trace)) {
162                                trace_perror(trace, "read packet");
163                        }
164                        event.type = TRACE_EVENT_TERMINATE;
165                        trace_destroy_packet(trace->event.packet);
166                        trace->event.packet = NULL;
167                        packet->buffer = NULL;
168                        packet->header = NULL;
169                        packet->payload = NULL;
170                        packet->buf_control = TRACE_CTRL_EXTERNAL;
171                        return event;
172                }
173        }
174
175        /* The goal here is to replicate the inter-packet gaps that are
176         * present in the trace. */
177
178        ts=trace_get_seconds(trace->event.packet);
179
180        /* Get the current walltime */
181#ifdef WIN32
182        _ftime64(&tstruct);
183        now = tstruct.time + 
184                ((double)tstruct.millitm / 1000.0);
185#else
186        gettimeofday(&stv, NULL);
187        now = stv.tv_sec + 
188                ((double)stv.tv_usec / 1000000.0);
189#endif
190
191       
192        if (fabs(trace->event.tdelta)>1e-9) {
193                /* Subtract the tdelta from the walltime to get a suitable
194                 * "relative" time */
195                now -= trace->event.tdelta; 
196
197                /* If the trace timestamp is still in the future, return a
198                 * SLEEP event, otherwise return the packet */
199                if (ts > now) {
200                        event.seconds = ts - 
201                                trace->event.trace_last_ts;
202                        trace->event.trace_last_ts = ts;
203                        event.type = TRACE_EVENT_SLEEP;
204                        trace->event.waiting = true;
205                        return event;
206                }
207        } else {
208                /* Work out the difference between the walltime at the start
209                 * of the trace replay and the timestamp of the first packet
210                 * in the trace. This will be used to convert the walltime
211                 * into a timeline that is relative to the timestamps in the
212                 * trace file.
213                 */
214                trace->event.tdelta = now - ts;
215        }
216
217        /* The packet that we had read earlier is now ready to be returned
218         * to the user - switch all the pointers etc. over */   
219        packet->type = trace->event.packet->type;
220        packet->trace = trace->event.packet->trace;
221        packet->header = trace->event.packet->header;
222        packet->payload = trace->event.packet->payload;
223       
224        packet->buffer = trace->event.packet->buffer;
225        packet->buf_control = trace->event.packet->buf_control;
226
227        event.type = TRACE_EVENT_PACKET;
228
229        trace->event.trace_last_ts = ts;
230        trace->event.waiting = false;
231
232        return event;
233}
234
235/* Catch undefined O_LARGEFILE on *BSD etc */
236#ifndef O_LARGEFILE
237#  define O_LARGEFILE 0
238#endif
239
240/* Catching O_BINARY on all sane OS's */
241#ifndef O_BINARY
242#  define O_BINARY 0
243#endif
244
245/* Open a file for reading using the new Libtrace IO system */
246io_t *trace_open_file(libtrace_t *trace)
247{
248        io_t *io=wandio_create(trace->uridata);
249
250        if (!io) {
251                if (errno != 0) {
252                        trace_set_err(trace,errno,"Unable to open %s",trace->uridata);
253                } else {
254                        trace_set_err(trace,TRACE_ERR_UNSUPPORTED_COMPRESS,"Unsupported compression error: %s", trace->uridata);
255                }
256        }
257        return io;
258}
259
260/* Open a file for writing using the new Libtrace IO system */ 
261iow_t *trace_open_file_out(libtrace_out_t *trace, int compress_type, int level, int fileflag)
262{
263        iow_t *io = NULL;
264
265        if (level < 0 || level > 9) {
266                trace_set_err_out(trace, TRACE_ERR_UNSUPPORTED_COMPRESS, 
267                                "Compression level %d is invalid, must be between 0 and 9 inclusive", 
268                                level);
269                return NULL;
270        }
271
272        if (compress_type < 0 || 
273                        compress_type >= TRACE_OPTION_COMPRESSTYPE_LAST) {
274                trace_set_err_out(trace, TRACE_ERR_UNSUPPORTED_COMPRESS,
275                                "Invalid compression type %d", compress_type);
276                return NULL;
277        }
278
279        io = wandio_wcreate(trace->uridata, compress_type, level, fileflag);
280
281        if (!io) {
282                trace_set_err_out(trace, errno, "Unable to create output file %s", trace->uridata);
283        }
284        return io;
285}
286
287
288/** Sets the error status for an input trace
289 * @param errcode either an Econstant from libc, or a LIBTRACE_ERROR
290 * @param msg a plaintext error message
291 * @internal
292 */
293void trace_set_err(libtrace_t *trace,int errcode,const char *msg,...)
294{
295        char buf[256];
296        va_list va;
297        va_start(va,msg);
298        assert(errcode != 0 && "An error occurred, but it is unknown what it is");
299        trace->err.err_num=errcode;
300        if (errcode>0) {
301                vsnprintf(buf,sizeof(buf),msg,va);
302                snprintf(trace->err.problem,sizeof(trace->err.problem),
303                                "%s: %s",buf,strerror(errcode));
304        } else {
305                vsnprintf(trace->err.problem,sizeof(trace->err.problem),
306                                msg,va);
307        }
308        va_end(va);
309}
310
311/** Sets the error status for an output trace
312 * @param errcode either an Econstant from libc, or a LIBTRACE_ERROR
313 * @param msg a plaintext error message
314 * @internal
315 */
316void trace_set_err_out(libtrace_out_t *trace,int errcode,const char *msg,...)
317{
318        char buf[256];
319        va_list va;
320        va_start(va,msg);
321        assert(errcode != 0 && "An error occurred, but it is unknown what it is");
322        trace->err.err_num=errcode;
323        if (errcode>0) {
324                vsnprintf(buf,sizeof(buf),msg,va);
325                snprintf(trace->err.problem,sizeof(trace->err.problem),
326                                "%s: %s",buf,strerror(errno));
327        } else {
328                vsnprintf(trace->err.problem,sizeof(trace->err.problem),
329                                msg,va);
330        }
331        va_end(va);
332}
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