138 lines
4.9 KiB
Plaintext
138 lines
4.9 KiB
Plaintext
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=head1 NAME
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editcap - Edit and/or translate the format of capture files
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=head1 SYNOPSYS
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B<editcap>
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S<[ B<-F> file format ]>
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S<[ B<-T> encapsulation type ]>
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S<[ B<-r> ]>
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S<[ B<-v> ]>
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S<[ B<-s> snaplen ]>
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S<[ B<-t> time adjustment ]>
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S<[ B<-h> ]>
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I<infile>
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I<outfile>
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S<[ I<record#> ... ]>
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=head1 DESCRIPTION
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B<Editcap> is a program that reads a saved capture file and writes some
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or all of the packets in that capture file to another capture file.
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B<Editcap> knows how to read B<libpcap> capture files, including those
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of B<tcpdump>. In addition, B<Editcap> can read capture files from
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B<snoop> (including B<Shomiti>) and B<atmsnoop>, B<LanAlyzer>,
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B<Sniffer> (compressed or uncompressed), Microsoft B<Network Monitor>,
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AIX's B<iptrace>, B<NetXray>, B<Sniffer Pro>, B<RADCOM>'s WAN/LAN
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analyzer, B<Lucent/Ascend> router debug output, HP-UX's B<nettl>, and
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the dump output from B<Toshiba's> ISDN routers. There is no need to
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tell B<Editcap> what type of file you are reading; it will determine the
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file type by itself. B<Editcap> is also capable of reading any of these
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file formats if they are compressed using gzip. B<Editcap> recognizes
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this directly from the file; the '.gz' extension is not required for
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this purpose.
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By default, it writes the capture file in B<libpcap> format, and writes
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all of the packets in the capture file to the output file. The B<-F>
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flag can be used to specify the format in which to write the capture
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file; it can write the file in B<libpcap> format (standard B<libpcap>
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format, a modified format used by some patched versions of B<libpcap>,
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the format used by Red Hat Linux 6.1, or the format used by SuSE Linux
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6.3), B<snoop> format, uncompressed B<Sniffer> format, Microsoft
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B<Network Monitor> 1.x format, and the format used by Windows-based
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versions of the B<Sniffer> software.
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A list of packet numbers can be specified on the command line; the
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packets with those numbers will I<not> be written to the capture file,
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unless the B<-r> flag is specified, in which case I<only> those packets
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will be written to the capture file. Ranges of packet numbers can be
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specified as I<start>-I<end>, referring to all packets from I<start> to
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I<end> (removing them all if B<-r> isn't specified, including them all
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if B<-r> is specified).
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If the B<-s> flag is used to specify a snapshot length, frames in the
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input file with more captured data than the specified snapshot length
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will have only the amount of data specified by the snapshot length
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written to the output file. This may be useful if the program that is
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to read the output file cannot handle packets larger than a certain size
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(for example, the versions of snoop in Solaris 2.5.1 and Solaris 2.6
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appear to reject Ethernet frames larger than the standard Ethernet MTU,
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making them incapable of handling gigabit Ethernet captures if jumbo
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frames were used).
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If the B<-t> flag is used to specify a time adjustment, the specified
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adjustment will be applied to all selected frames in the capture file.
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The adjustment is specified as [-]I<seconds>[I<.fractional seconds>].
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For example, B<-t> 3600 advances the timestamp on selected frames by one
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hour while B<-t> -0.5 reduces the timestamp on selected frames by
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one-half second. This feature is useful when synchronizing dumps
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collected on different machines where the time difference between the
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two machines is known or can be estimated.
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If the B<-T> flag is used to specify an encapsulation type, the
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encapsulation type of the output capture file will be forced to the
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specified type, rather than being the type appropriate to the
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encapsulation type of the input capture file. Note that this merely
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forces the encapsulation type of the output file to be the specified
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type; the packet headers of the packets will not be translated from the
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encapsulation type of the input capture file to the specified
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encapsulation type (for example, it will not translate an Ethernet
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capture to an FDDI capture if an Ethernet capture is read and 'B<-T
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fddi>' is specified).
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=head1 OPTIONS
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=over 4
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=item -F
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Sets the file format of the output capture file.
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=item -T
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Sets the packet encapsulation type of the output capture file.
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=item -r
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Causes the packets whose packet numbers are specified on the command
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line to be written to the output capture file, and no other packets to
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be written to the output capture file.
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=item -v
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Causes B<editcap> to print a number of messages while it's working.
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=item -s
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Sets the snapshot length to use when writing the data.
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=item -t
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Sets the time adjustment to use on selected frames.
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=item -h
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Prints the version and options and exits.
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=head1 SEE ALSO
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L<tcpdump(8)>, L<pcap(3)>, L<ethereal(1)>, L<mergecap(1)>
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=head1 NOTES
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B<Editcap> is part of the B<Ethereal> distribution. The latest version
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of B<Ethereal> can be found at B<http://www.ethereal.com>.
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=head1 AUTHORS
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Original Author
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-------- ------
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Richard Sharpe <sharpe@ns.aus.com>
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Contributors
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------------
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Guy Harris <guy@alum.mit.edu>
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