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Changes: Thu. April 1, 2010. guy@alum.mit.edu. Summary for 1.1.1 libpcap release Update CHANGES to reflect more of the changes in 1.1.0. Fix build on RHEL5. Fix shared library build on AIX. Thu. March 11, 2010. ken@netfunctional.ca/guy@alum.mit.edu. Summary for 1.1.0 libpcap release Add SocketCAN capture support Add Myricom SNF API support Update Endace DAG and ERF support Add support for shared libraries on Solaris, HP-UX, and AIX Build, install, and un-install shared libraries by default; don't build/install shared libraries on platforms we don't support Fix building from a directory other than the source directory Fix compiler warnings and builds on some platforms Update config.guess and config.sub Support monitor mode on mac80211 devices on Linux Fix USB memory-mapped capturing on Linux; it requires a new DLT_ value On Linux, scan /sys/class/net for devices if we have it; scan it, or /proc/net/dev if we don't have /sys/class/net, even if we have getifaddrs(), as it'll find interfaces with no addresses Add limited support for reading pcap-ng files Fix BPF driver-loading error handling on AIX Support getting the full-length interface description on FreeBSD In the lexical analyzer, free up any addrinfo structure we got back from getaddrinfo(). Add support for BPF and libdlpi in OpenSolaris (and SXCE) Hyphenate "link-layer" everywhere Add /sys/kernel/debug/usb/usbmon to the list of usbmon locations In pcap_read_linux_mmap(), if there are no frames available, call poll() even if we're in non-blocking mode, so we pick up errors, and check for the errors in question. Note that poll() works on BPF devices is Snow Leopard If an ENXIO or ENETDOWN is received, it may mean the device has gone away. Deal with it. For BPF, raise the default capture buffer size to from 32k to 512k Support ps_ifdrop on Linux Added a bunch of #ifdef directives to make wpcap.dll (WinPcap) compile under cygwin. Changes to Linux mmapped captures. Fix bug where create_ring would fail for particular snaplen and buffer size combinations Update pcap-config so that it handles libpcap requiring additional libraries Add workaround for threadsafeness on Windows Add missing mapping for DLT_ENC <-> LINKTYPE_ENC DLT: Add DLT_CAN_SOCKETCAN DLT: Add Solaris ipnet Don't check for DLT_IPNET if it's not defined Add link-layer types for Fibre Channel FC-2 Add link-layer types for Wireless HART Add link-layer types for AOS Add link-layer types for DECT Autoconf fixes (AIX, HP-UX, OSF/1, Tru64 cleanups) Install headers unconditionally, and include vlan.h/bluetooth.h if enabled Autoconf fixes+cleanup Support enabling/disabling bluetooth (--{en,dis}able-bluetooth) Support disabling SITA support (--without-sita) Return -1 on failure to create packet ring (if supported but creation failed) Fix handling of 'any' device, so that it can be opened, and no longer attempt to open it in Monitor mode Add support for snapshot length for USB Memory-Mapped Interface Fix configure and build on recent Linux kernels Fix memory-mapped Linux capture to support pcap_next() and pcap_next_ex() Fixes for Linux USB capture DLT: Add DLT_LINUX_EVDEV DLT: Add DLT_GSMTAP_UM DLT: Add DLT_GSMTAP_ABIS
128 lines
4.7 KiB
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128 lines
4.7 KiB
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'\" t
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.\" @(#) $Header: /tcpdump/master/libpcap/pcap-savefile.manfile.in,v 1.2 2008-10-24 07:33:50 guy Exp $
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.\"
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.\" Copyright (c) 1994, 1996, 1997
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that: (1) source code distributions
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.\" retain the above copyright notice and this paragraph in its entirety, (2)
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.\" distributions including binary code include the above copyright notice and
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.\" this paragraph in its entirety in the documentation or other materials
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.\" provided with the distribution, and (3) all advertising materials mentioning
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.\" features or use of this software display the following acknowledgement:
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.\" ``This product includes software developed by the University of California,
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.\" Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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.\" the University nor the names of its contributors may be used to endorse
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.\" or promote products derived from this software without specific prior
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.\" written permission.
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.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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.\"
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.TH PCAP-SAVEFILE @MAN_FILE_FORMATS@ "21 October 2008"
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.SH NAME
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pcap-savefile \- libpcap savefile format
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.SH DESCRIPTION
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NOTE: applications and libraries should, if possible, use libpcap to
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read savefiles, rather than having their own code to read savefiles.
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If, in the future, a new file format is supported by libpcap,
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applications and libraries using libpcap to read savefiles will be able
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to read the new format of savefiles, but applications and libraries
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using their own code to read savefiles will have to be changed to
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support the new file format.
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.PP
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``Savefiles'' read and written by libpcap and applications using libpcap
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start with a per-file header. The format of the per-file header is:
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.RS
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.TS
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box;
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c s
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c | c
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c s.
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Magic number
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_
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Major version Minor version
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_
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Time zone offset
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_
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Time stamp accuracy
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_
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Snapshot length
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_
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Link-layer header type
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.TE
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.RE
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.PP
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All fields in the per-file header are in the byte order of the host
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writing the file. The first field in the per-file header is a 4-byte
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magic number, with the value 0xa1b2c3d4. The magic number, when read by
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a host with the same byte order as the host that wrote the file, will
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have the value 0xa1b2c3d4, and, when read by a host with the opposite
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byte order as the host that wrote the file, will have the value
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0xd4c3b2a1. That allows software reading the file to determine whether
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the byte order of the host that wrote the file is the same as the byte
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order of the host on which the file is being read, and thus whether the
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values in the per-file and per-packet headers need to be byte-swapped.
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.PP
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Following this are:
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.IP
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A 2-byte file format major version number; the current version number is
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2.
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.IP
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A 2-byte file format minor version number; the current version number is
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4.
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.IP
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A 4-byte time zone offset; this is always 0.
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.IP
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A 4-byte number giving the accuracy of time stamps in the file; this is
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always 0.
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.IP
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A 4-byte number giving the "snapshot length" of the capture; packets
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longer than the snapshot length are truncated to the snapshot length, so
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that, if the snapshot length is
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.IR N ,
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only the first
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.I N
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bytes of a packet longer than
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.I N
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bytes will be saved in the capture.
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.IP
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a 4-byte number giving the link-layer header type for packets in the
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capture; see
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.BR pcap-linktype (@MAN_MISC_INFO@)
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for the
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.B LINKTYPE_
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values that can appear in this field.
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.PP
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Following the per-file header are zero or more packets; each packet
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begins with a per-packet header, which is immediately followed by the
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raw packet data. The format of the per-packet header is:
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.RS
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.TS
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box;
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c.
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Time stamp, seconds value
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_
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Time stamp, microseconds value
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_
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Length of captured packet data
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_
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Un-truncated length of the packet data
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.TE
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.RE
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.PP
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All fields in the per-packet header are in the byte order of the host
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writing the file. The per-packet header begins with a time stamp giving
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the approximate time the packet was captured; the time stamp consists of
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a 4-byte value, giving the time in seconds since January 1, 1970,
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00:00:00 UTC, followed by a 4-byte value, giving the time in
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microseconds since that second. Following that are a 4-byte value
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giving the number of bytes of captured data that follow the per-packet
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header and a 4-byte value giving the number of bytes that would have
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been present had the packet not been truncated by the snapshot length.
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The two lengths will be equal if the number of bytes of packet data are
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less than or equal to the snapshot length.
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.SH SEE ALSO
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pcap(3PCAP), pcap-linktype(@MAN_MISC_INFO@)
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