261 lines
10 KiB
C
261 lines
10 KiB
C
/*
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* Copyright (c) 1993, 1994, 1995, 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 the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the Computer Systems
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* Engineering Group at Lawrence Berkeley Laboratory.
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* 4. Neither the name of the University nor of the Laboratory may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#) $Header: /tcpdump/master/libpcap/pcap.h,v 1.27 2000-09-18 05:08:02 guy Exp $ (LBL)
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*/
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#ifndef lib_pcap_h
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#define lib_pcap_h
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#include <sys/types.h>
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#include <sys/time.h>
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#include <net/bpf.h>
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#include <stdio.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define PCAP_VERSION_MAJOR 2
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#define PCAP_VERSION_MINOR 4
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#define PCAP_ERRBUF_SIZE 256
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/*
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* Compatibility for systems that have a bpf.h that
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* predates the bpf typedefs for 64-bit support.
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*/
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#if BPF_RELEASE - 0 < 199406
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typedef int bpf_int32;
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typedef u_int bpf_u_int32;
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#endif
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typedef struct pcap pcap_t;
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typedef struct pcap_dumper pcap_dumper_t;
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/*
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* The first record in the file contains saved values for some
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* of the flags used in the printout phases of tcpdump.
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* Many fields here are 32 bit ints so compilers won't insert unwanted
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* padding; these files need to be interchangeable across architectures.
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*
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* Do not change the format of this structure, in any way (this includes
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* changes that only affect the length of fields in this structure).
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* Instead:
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*
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* introduce a new structure for the new format;
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*
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* send mail to "tcpdump-workers@tcpdump.org", requesting a new
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* magic number for your new capture file format, and, when
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* you get the new magic number, put it in "savefile.c";
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*
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* use that magic number for save files with the changed file
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* header;
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*
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* make the code in "savefile.c" capable of reading files with
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* the old file header as well as files with the new file header
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* (using the magic number to determine the header format).
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*
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* Then supply the changes to "patches@tcpdump.org", so that future
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* versions of libpcap and programs that use it (such as tcpdump) will
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* be able to read your new capture file format.
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*/
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struct pcap_file_header {
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bpf_u_int32 magic;
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u_short version_major;
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u_short version_minor;
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bpf_int32 thiszone; /* gmt to local correction */
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bpf_u_int32 sigfigs; /* accuracy of timestamps */
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bpf_u_int32 snaplen; /* max length saved portion of each pkt */
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bpf_u_int32 linktype; /* data link type (PCAP_ENCAP_*) */
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};
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/*
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* Values for "linktype" in the file header.
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*
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* In the past, these have been DLT_ codes defined by <net/bpf.h>.
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* Those codes were used in two places:
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*
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* inside BSD kernels, as the value returned by the BIOCGDLT ioctl
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* for "/dev/bpfN" devices;
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*
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* inside libpcap capture file headers.
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*
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* Unfortunately, the various flavors of BSD have not always used the same
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* numerical values for the same data types, and various patches to
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* libpcap for non-BSD OSes have added their own DLT_ codes for link
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* layer encapsulation types seen on those OSes, and those codes have had,
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* in some cases, values that were also used, on other platforms, for other
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* link layer encapsulation types.
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*
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* This means that capture files of a type whose numerical DLT_ code
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* means different things on different BSDs, or with different versions
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* of libpcap, can't always be read on systems other than those like
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* the one running on the machine on which the capture was made.
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*
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* We therefore now, in an attempt to decouple the values supplied by
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* BIOCGDLT from the values used in the libpcap file header, define
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* a set of PCAP_ENCAP_* codes to be used in the header; "pcap_open_live()"
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* in the various "pcap-bpf.c" files should set the "linktype" field of
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* the "pcap_t" it returns to a PCAP_ENCAP_* code, not to a DLT_* code.
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*
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* For those DLT_* codes that have, as far as we know, the same values on
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* all platforms (DLT_NULL through DLT_FDDI), we define PCAP_ENCAP_xxx as
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* DLT_xxx; this means that captures of those types will continue to use
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* the same "linktype" value, and thus will continue to be readable by
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* older versions of libpcap.
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*
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* The other PCAP_ENCAP_* codes are given values starting at 100, in the
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* hopes that no DLT_* code will be given one of those values.
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*
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* In order to ensure that a given PCAP_ENCAP_* code's value will refer to
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* the same encapsulation type on all platforms, you should not allocate
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* a new PCAP_ENCAP_* value without consulting "tcpdump-workers@tcpdump.org".
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* The tcpdump developers will allocate a value for you, and will not
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* subsequently allocate it to anybody else; that value will be added to
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* the "pcap.h" in the tcpdump.org CVS repository, so that a future
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* libpcap release will include it.
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*
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* You should, if possible, also contribute patches to libpcap and tcpdump
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* to handle the new encapsulation type, so that they can also be checked
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* into the tcpdump.org CVS repository and so that they will appear in
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* future libpcap and tcpdump releases.
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*
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* PCAP_ENCAP_* codes should not be used inside kernels; DLT_* codes
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* should be used inside kernels that support BSD's BPF mechanism (other
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* kernels may use other codes, e.g. ARPHRD_* codes in Linux kernels
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* and DL_* codes in kernels using DLPI).
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*/
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#define PCAP_ENCAP_NULL DLT_NULL
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#define PCAP_ENCAP_ETHERNET DLT_EN10MB /* also for 100Mb and up */
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#define PCAP_ENCAP_EXP_ETHERNET DLT_EN3MB /* 3Mb experimental Ethernet */
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#define PCAP_ENCAP_AX25 DLT_AX25
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#define PCAP_ENCAP_PRONET DLT_PRONET
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#define PCAP_ENCAP_CHAOS DLT_CHAOS
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#define PCAP_ENCAP_TOKEN_RING DLT_IEEE802 /* DLT_IEEE802 is used for Token Ring */
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#define PCAP_ENCAP_ARCNET DLT_ARCNET
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#define PCAP_ENCAP_SLIP DLT_SLIP
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#define PCAP_ENCAP_PPP DLT_PPP
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#define PCAP_ENCAP_FDDI DLT_FDDI
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#define PCAP_ENCAP_ATM_RFC1483 100 /* LLC/SNAP-encapsulated ATM */
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#define PCAP_ENCAP_RAW 101 /* raw IP */
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#define PCAP_ENCAP_SLIP_BSDOS 102 /* BSD/OS SLIP BPF header */
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#define PCAP_ENCAP_PPP_BSDOS 103 /* BSD/OS PPP BPF header */
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#define PCAP_ENCAP_C_HDLC 104 /* Cisco HDLC */
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#define PCAP_ENCAP_IEEE802_11 105 /* IEEE 802.11 (wireless) */
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#define PCAP_ENCAP_ATM_CLIP 106 /* Linux Classical IP over ATM */
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/*
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* PCAP_ENCAP_PPP is for use when there might, or might not, be an RFC 1662
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* PPP in HDLC-like framing header (with 0xff 0x03 before the PPP protocol
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* field) at the beginning of the packet.
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*
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* This is for use when there is always such a header; the address field
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* might be 0xff, for regular PPP, or it might be an address field for Cisco
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* point-to-point with HDLC framing as per section 4.3.1 of RFC 1547 ("Cisco
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* HDLC"). This is, for example, what you get with NetBSD's DLT_PPP_SERIAL.
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*/
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#define PCAP_ENCAP_PPP_HDLC 107 /* PPP in HDLC-like framing */
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/*
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* Each packet in the dump file is prepended with this generic header.
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* This gets around the problem of different headers for different
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* packet interfaces.
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*/
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struct pcap_pkthdr {
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struct timeval ts; /* time stamp */
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bpf_u_int32 caplen; /* length of portion present */
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bpf_u_int32 len; /* length this packet (off wire) */
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};
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/*
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* As returned by the pcap_stats()
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*/
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struct pcap_stat {
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u_int ps_recv; /* number of packets received */
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u_int ps_drop; /* number of packets dropped */
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u_int ps_ifdrop; /* drops by interface XXX not yet supported */
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};
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typedef void (*pcap_handler)(u_char *, const struct pcap_pkthdr *,
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const u_char *);
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char *pcap_lookupdev(char *);
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int pcap_lookupnet(char *, bpf_u_int32 *, bpf_u_int32 *, char *);
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pcap_t *pcap_open_live(char *, int, int, int, char *);
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pcap_t *pcap_open_dead(int, int);
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pcap_t *pcap_open_offline(const char *, char *);
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void pcap_close(pcap_t *);
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int pcap_loop(pcap_t *, int, pcap_handler, u_char *);
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int pcap_dispatch(pcap_t *, int, pcap_handler, u_char *);
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const u_char*
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pcap_next(pcap_t *, struct pcap_pkthdr *);
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int pcap_stats(pcap_t *, struct pcap_stat *);
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int pcap_setfilter(pcap_t *, struct bpf_program *);
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void pcap_perror(pcap_t *, char *);
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char *pcap_strerror(int);
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char *pcap_geterr(pcap_t *);
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int pcap_compile(pcap_t *, struct bpf_program *, char *, int,
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bpf_u_int32);
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int pcap_compile_nopcap(int, int, struct bpf_program *,
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char *, int, bpf_u_int32);
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/* XXX */
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int pcap_freecode(pcap_t *, struct bpf_program *);
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int pcap_datalink(pcap_t *);
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int pcap_snapshot(pcap_t *);
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int pcap_is_swapped(pcap_t *);
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int pcap_major_version(pcap_t *);
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int pcap_minor_version(pcap_t *);
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/* XXX */
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FILE *pcap_file(pcap_t *);
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int pcap_fileno(pcap_t *);
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pcap_dumper_t *pcap_dump_open(pcap_t *, const char *);
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void pcap_dump_close(pcap_dumper_t *);
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void pcap_dump(u_char *, const struct pcap_pkthdr *, const u_char *);
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/* XXX this guy lives in the bpf tree */
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u_int bpf_filter(struct bpf_insn *, u_char *, u_int, u_int);
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int bpf_validate(struct bpf_insn *f, int len);
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char *bpf_image(struct bpf_insn *, int);
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void bpf_dump(struct bpf_program *, int);
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#ifdef __cplusplus
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}
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#endif
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#endif
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