Provided by: tcpflow-nox_1.4.5+repack1-1ubuntu0.1_amd64 bug

NAME

       tcpflow - TCP flow recorder

SYNOPSIS

       tcpflow [-aBcCDhpsvVZ] [-b max_bytes] [-d debug_level] [-[eE] scanner] [-f max_fds]
       [-F[ctTXMkmg]] [-i iface] [-L semlock] [-m min_bytes] [-o outdir] [-r file1.pcap]
       [-R file0.pcap] [-Sname=value] [-T[filename template]] [-wfile] [-x scanner] [-X file.xml]
       [expression]

DESCRIPTION

       tcpflow is a program that captures data transmitted as part of TCP connections (flows),
       and stores the data in a way that is convenient for protocol analysis or debugging.
       Rather than showing packet-by-packet information, tcpflow reconstructs the actual data
       streams and stores each flow in a separate file for later analysis.  tcpflow understands
       TCP sequence numbers and will correctly reconstruct data streams regardless of
       retransmissions or out-of-order delivery. tcpflow provides control over filenames for
       automatic binning of connections by protocol, IP adress or connection number, and has a
       sophisticated plug-in system for decompressing compressed HTTP connections, undoing MIME
       encoding, or calling user-provided programs for post-processing.

       By default tcpflow stores all captured data in files that have names of the form:

            192.168.101.102.02345-010.011.012.013.45103

       ...where the contents of the above file would be data transmitted from host
       192.168.101.102 port 2345, to host 10.11.12.13 port 45103.

       If you want to simply process a few hundred thousand packets and see what you have, try
       this:

            tcpflow -a -o outdir -Fk -r packets.pcap

       This will cause tcpflow to perform (-a) all processing, store the output in a directory
       called outdir, bin the output in directories of 1000 connections each, and read its input
       from the file packets.pcap. More sophisticiated processing is possible, of course.

OPTIONS

       -a     Enable all processing. Same as -e all.

       -B     Force binary output even when printing to console with -C or -c.

       -b max_bytes
              Specifies the maximum size of a captured flow.  Any bytes beyond max_bytes from the
              first byte captured will be discarded.  The default is to store an unlimited number
              of bytes per flow. Note: previous versions of tcpflow could only store a maximum of
              4GiB per flow, but version 1.4 and above can really store an unlimited amount of
              bytes.  Good thing that modern disks are so big, eh?

       -c     Console print.  Print the contents of packets to stdout as they are received,
              without storing any captured data to files (implies

       -C     Console print without the packet source and destination details being printed.
              Print the contents of packets to stdout as they are received, without storing any
              captured data to files (implies -e When outputting to the console each flow will be
              output in different colors (blue for client to server flows, red for server to
              client flows, green for undecided flows).  -s ).

       -D     Console output should be in hex.

       -d     Debug level.  Set the level of debugging messages printed to stderr to debug_level.
              Higher numbers produce more messages.  -d 0 causes completely silent operation.  -d
              1 , the default, produces minimal status messages.  -d 10 produces verbose output
              equivalent to -v .  Numbers higher than 10 can produce a large amount of debugging
              information useful only to developers.

       -E name
              Disable all scanners and then enable scanner name

       -e name
              Enable scanner name.

       -e all Enables all scanners. Same as -a

       -e http
              Perform HTTP post-processing ("After" processing). If the output file is

                   208.111.153.175.00080-192.168.001.064.37314,

              Then the post-processing will create the files:

                   208.111.153.175.00080-192.168.001.064.37314-HTTP
                   208.111.153.175.00080-192.168.001.064.37314-HTTPBODY

              If the HTTPBODY was compressed with GZIP, you may get a third file as well:
                   208.111.153.175.00080-192.168.001.064.37314-HTTPBODY-GZIP

              Additional information about these streams, such as their MD5 hash value, is also
              written to the DFXML file

       -F[format]
              Specifies format for output filenames. Format specifiers: c appends the connection
              counter to ALL filenames.  t prepends each filename with a Unix timestamp.  T
              prepends each filename with an ISO-8601 timestamp.  X Do not output any files
              (other than the report.xml report files).

       -FM    Include MD5 of each flow in the DFXML output.

       -FX    Suppresses file output entirely (DFXML file is still produced).

       -Fk    bin output in 1K directories

       -Fm    bin output in 1M directories (2 levels)

       -Fg    bin output in 1G directories (3 levels) -T[format] Specifies an arbitrary template
              for filenames.  %A expands to source IP address.  %a expands to source IP port.  %B
              expands to destination IP address.  %a expands to destination IP port.  %T expands
              to timestamp in ISO8601 format.  %t expands to timestamp in Unix time_t format.  %V
              expands to "--" if a VLAN is present.  %v expands to the VLAN number if a VLAN is
              present.  %C expands to "c" if the connection count>0.  %c expands to the
              connection count if the connection count>0.  %# always expands to the connection
              count.  %% prints a "%".

       -fmax_fds
              Max file descriptors used.  Limit the number of file descriptors used by tcpflow to
              max_fds.  Higher numbers use more system resources, but usually perform better.  If
              the underlying operating system supports the setrlimit() system call, the OS will
              be asked to enforce the requested limit.  The default is for tcpflow to use the
              maximum number of file descriptors allowed by the OS.  The -v option will report
              how many file descriptors tcpflow is using.

       -h     Help.  Print usage information and exit.

       -hh    More help.  Print more usage information and exit.

       -i iface
              Interface name.  Capture packets from the network interface named iface.  If no
              interface is specified with -i , a reasonable default will be used by libpcap
              automatically.

       -L semlock_name
              Specifies that semlock_name should be used as a Unix semaphore to prevent two
              different copies of tcpflow running in two different processes but outputing to the
              same standard output from printing on top of each other. This is an application of
              Unix named semaphores; bet you have never seen one before.

       -l     Treat the following arguments as filenames with an assumed -r command before each
              one.  This allows you to read a lot of files at once with shell globbing. For
              example, to process all of the pcap files in the current directory, use this:

                   tcpflow -o out -a -l *.pcap

       -J     Output flow information to console in multiple colors. NOTE: This option was
              changed from tcpflow 1.3.

       -m min_size
              Forces a new connection output file when there is a skip in the TCP session of
              min_size bytes or more.

       -o outdir
              Specifies the output directory where the transcript files will be written.

       -P     No purge. Normally tcpflow removes connections from the hash table after the
              connection is closed with a FIN. This conserves memory but takes additional CPU
              time. Selecting this option causes the std::tr1:unordered_map to grow without
              bounds, as tcpflow did prior to version 1.1. That makes tcpflow run faster if there
              are less than 10 million connections, but can lead to out-of-memory errors.

       -p     No promiscuous mode.  Normally, tcpflow attempts to put the network interface into
              promiscuous mode before capturing packets.  The -p option tells tcpflow not to put
              the interface into promiscuous mode.  Note that it might already be in promiscuous
              mode for some other reason.

       -q     Quiet mode --- don't print warnings. Currently the only warning that tcpflow prints
              is a warning when more than 10,000 files are created that the user should have
              provided the -Fk, -Fm, or -Fg options. We might have other warnings in the future.

       -r     Read from file.  Read packets from file, which was created using the -w option of
              tcpdump(1).  This option may be repeated any number of times. Standard input is
              used if file is "-".  Note that for this option to be useful, tcpdump's -s option
              should be used to set the snaplen to the MTU of the interface (e.g., 1500) while
              capturing packets.

       -R     Read from a file, but only to complete TCP flows. This option is used when tcpflow
              is used to process a series of files that are captured over time.  For each time
              period n, file  filen.pcap should be processed with  R -r filen.pcap, while
              file(n-1).pcap should be processed with R -R file(n-1).pcap.

       -Sname=value
              Sets a name parameter to be equal to value for a plug-in.  Use -hh to find out all
              of the settable parameters.

       -s     Strip non-printables.  Convert all non-printable characters to the "." character
              before printing packets to the console or storing them to a file.

       -V     Print the version number and exit.

       -v     Verbose operation.  Verbosely describe tcpflow's operation.  Equivalent to  -d 10.

       -w filename.pcap
              Write packets that were not processed to filename.pcap. Typically this will be UDP
              packets.

       -X filename.xml
              Write a DFXML report file to filename.xml. The file contains a record of every tcp
              connection, how the tcpflow program was compiled, and the computer on which tcpflow
              was run.

       -Z     Don't decompress gzip-compressed streams.

EXAMPLES

       To record all packets arriving at or departing from sundown and extract all of the HTTP
       attachments:
              tcpflow -e scan_http -o outdir host sundown

       To record traffic between helios and either hot or ace and bin the results into 1000 files
       per directory and calculate the MD5 of each flow:
              tcpflow -X report.xml -e scan_md5 -o outdir -Fk host helios and \( hot or ace \)

BUGS

       Please send bug reports to simsong@acm.org.

       tcpflow currently does not understand IP fragments.  Flows containing IP fragments will
       not be recorded correctly.

AUTHORS

       Originally by Jeremy Elson <jelson@circlemud.org>.  Substantially modified and maintained
       by Simson L. Garfinkel <simsong@acm.org>.  Network visualization code by Michael Shick
       <mike@shick.in>

       The current version of this software is available at
              http://www.digitalcorpora.org/downloads/tcpflow/

       An announcement mailing list for this program is at:
              http://groups.google.com/group/tcpflow-users

SEE ALSO

       tcpdump(1), nit(4P), bpf(4), pcap(3), pcap-savefile(5), pcap-filter(7)