Hi Lucas,
2013/3/20 Lucas Nussbaum <lu...@debian.org>:
> Package: tshark
> Version: 1.8.2-5wheezy1
> Severity: important
>
> Hi,
>
> tshark's man page says:
> When writing packets to a file, TShark, by default, writes the file
> in libpcap format [..]
> and also says:
> -F <file format>
> Set the file format of the output capture file written using the
> -w option. The output written with the -w option is raw packet
> data, not text, so there is no -F option to request text output.
> The option -F without a value will list the available formats.
Please note that it also says:
...
When writing packets to a file, TShark, by default, writes the
file in libpcap
format, and writes all of the packets it sees to the output file. The -F
option can be used to specify the format in which to write the
file. This list
of available file formats is displayed by the -F flag without a value.
However, you can't specify a file format for a live capture.
>
>
> However:
> 1) tshark uses the pcap-ng format, not the libpcap format.
> 2) the -F switch does not work.
>
> The problem can be produced with:
>
> $ sudo tshark -i lo -w - > f ; file f
> [..]
> f: pcap-ng capture file - version 1.0
>
> $ sudo tshark -F libpcap -i lo -w - > f ; file f
> [..]
> f: pcap-ng capture file - version 1.0
>
> In both cases, I would expect tshark to use the libpcap format, like
> tcpdump:
> $ sudo tcpdump -i lo -w - > f ; file f
> [..]
> f: tcpdump capture file (little-endian) - version 2.4 (Ethernet, capture
> length 65535)
Please use dumpcap -P instead. From man dumpcap:
-P Save files as pcap instead of the default pcap-ng. In situations that
require pcap-ng, such as capturing from multiple
interfaces, this option
will be overridden.
>
>
> The version in experimental (1.9.1-1) is also affected.
> The version in squeeze is not affected.
>
>
> This breaks the "use tshark or dumpcap as a remote probe over SSH" use
> case described in http://wiki.wireshark.org/CaptureSetup/Pipes :
> $ wireshark -k -i <( ssh root@host tshark -i eth0 -w -)
Please use dumpcap -P instead in this scenario, it is expected to work.
Cheers,
Balint
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