110 lines
3.5 KiB
Plaintext
110 lines
3.5 KiB
Plaintext
.\" Copyright (c) 1994, 1996, 1997
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that: (1) source code distributions
|
|
.\" retain the above copyright notice and this paragraph in its entirety, (2)
|
|
.\" distributions including binary code include the above copyright notice and
|
|
.\" this paragraph in its entirety in the documentation or other materials
|
|
.\" provided with the distribution, and (3) all advertising materials mentioning
|
|
.\" features or use of this software display the following acknowledgement:
|
|
.\" ``This product includes software developed by the University of California,
|
|
.\" Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
|
|
.\" the University nor the names of its contributors may be used to endorse
|
|
.\" or promote products derived from this software without specific prior
|
|
.\" written permission.
|
|
.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
|
|
.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
|
|
.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
|
.\"
|
|
.TH PCAP_OPEN_OFFLINE 3PCAP "3 January 2014"
|
|
.SH NAME
|
|
pcap_open_offline, pcap_open_offline_with_tstamp_precision,
|
|
pcap_fopen_offline, pcap_fopen_offline_with_tstamp_precision \- open a saved capture file for reading
|
|
.SH SYNOPSIS
|
|
.nf
|
|
.ft B
|
|
#include <pcap/pcap.h>
|
|
.ft
|
|
.LP
|
|
.nf
|
|
.ft B
|
|
char errbuf[PCAP_ERRBUF_SIZE];
|
|
.ft
|
|
.LP
|
|
.ft B
|
|
pcap_t *pcap_open_offline(const char *fname, char *errbuf);
|
|
pcap_t *pcap_open_offline_with_tstamp_precision(const char *fname,
|
|
u_int precision, char *errbuf);
|
|
pcap_t *pcap_fopen_offline(FILE *fp, char *errbuf);
|
|
pcap_t *pcap_fopen_offline_with_tstamp_precision(FILE *fp,
|
|
u_int precision, char *errbuf);
|
|
.ft
|
|
.fi
|
|
.SH DESCRIPTION
|
|
.B pcap_open_offline()
|
|
and
|
|
.B pcap_open_offline_with_tstamp_precision()
|
|
are called to open a ``savefile'' for reading.
|
|
.PP
|
|
.I fname
|
|
specifies the name of the file to open. The file can have the pcap file
|
|
format as described in
|
|
.BR pcap-savefile (@MAN_FILE_FORMATS@),
|
|
which is the file format used by, among other programs,
|
|
.BR tcpdump (1)
|
|
and
|
|
.BR tcpslice (1),
|
|
or can have the pcap-ng file format, although not all pcap-ng files can
|
|
be read.
|
|
The name "-" is a synonym for
|
|
.BR stdin .
|
|
.PP
|
|
.B pcap_open_offline_with_tstamp_precision()
|
|
takes an additional
|
|
.I precision
|
|
argument specifying the time stamp precision desired;
|
|
if
|
|
.B PCAP_TSTAMP_PRECISION_MICRO
|
|
is specified, packet time stamps will be supplied in seconds and
|
|
microseconds,
|
|
and if
|
|
.B PCAP_TSTAMP_PRECISION_NANO
|
|
is specified, packet time stamps will be supplied in seconds and
|
|
nanoseconds. If the time stamps in the file do not have the same
|
|
precision as the requested precision, they will be scaled up or down as
|
|
necessary before being supplied.
|
|
.PP
|
|
Alternatively, you may call
|
|
.B pcap_fopen_offline()
|
|
or
|
|
.B pcap_fopen_offline_with_tstamp_precision()
|
|
to read dumped data from an existing open stream
|
|
.IR fp .
|
|
.B pcap_fopen_offline_with_tstamp_precision() takes an additional
|
|
.I precision
|
|
argument as described above.
|
|
Note that on Windows, that stream should be opened in binary mode.
|
|
.SH RETURN VALUE
|
|
.BR pcap_open_offline() ,
|
|
.BR pcap_open_offline_with_tstamp_precision() ,
|
|
.BR pcap_fopen_offline() ,
|
|
and
|
|
.B pcap_fopen_offline_with_tstamp_precision()
|
|
return a
|
|
.I pcap_t *
|
|
on success and
|
|
.B NULL
|
|
on failure.
|
|
If
|
|
.B NULL
|
|
is returned,
|
|
.I errbuf
|
|
is filled in with an appropriate error message.
|
|
.I errbuf
|
|
is assumed to be able to hold at least
|
|
.B PCAP_ERRBUF_SIZE
|
|
chars.
|
|
.SH SEE ALSO
|
|
pcap(3PCAP), pcap-savefile(@MAN_FILE_FORMATS@)
|