![Guy Harris](/assets/img/avatar_default.png)
snapshot length before writing them to the output file; this may come in handy if you are translating the file to a different format so that it can be read by a program that can't handle packets above a certain size (e.g., the snoop in Solaris 2.5.1 or 2.6, which reject Ethernet packets larger than the Ethernet MTU, and thus can't handle gigabit Ethernet captures using jumbo frames). svn path=/trunk/; revision=1891
120 lines
4 KiB
Text
120 lines
4 KiB
Text
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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<-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>
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capture files, including those of B<tcpdump>. In addition, B<Editcap> can
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read capture files from B<snoop> (including B<Shomiti>) and B<atmsnoop>,
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B<LanAlyzer>, uncompressed B<Sniffer>, 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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or the format used by Red Hat Linux 6.1), B<snoop> format, uncompressed
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B<Sniffer> format, Microsoft B<Network Monitor> 1.x format, and the
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format used by Windows-based 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.
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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 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 -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)>
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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://ethereal.zing.org>.
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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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