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NAMEextcap - The extcap interfaceDESCRIPTIONThe extcap interface is a versatile plugin interface that allows external binaries to act as capture interfaces directly in wireshark. It is used in scenarios, where the source of the capture is not a traditional capture model (live capture from an interface, from a pipe, from a file, etc). The typical example is connecting esoteric hardware of some kind to the main wireshark app. Without extcap, a capture can always be achieved by directly writing to a capture file:the-esoteric-binary --the-strange-flag --interface=stream1 --file dumpfile.pcap & wireshark dumpfile.pcapbut the extcap interface allows for such a connection to be easily established and configured using the wireshark GUI. The extcap subsystem is made of multiple extcap binaries that are automatically called by the GUI in a row. In the following chapters we will refer to them as "the extcaps". Extcaps may be any binary or script within the extcap directory. Please note, that scripts need to be executable without prefacing a script interpreter before the call. To go deeper into the extcap utility development, please refer to README.extcap. WINDOWS USER: Because of restrictions directly calling the script may not always work. In such a case, a batch file may be provided, which then in turn executes the script. Please refer to doc/extcap_example.py for more information. GRAMMAR ELEMENTSGrammar elements:
EXAMPLESExample 1:arg {number=0}{call=--channel}{display=Wi-Fi Channel}{type=integer}{required=true} arg {number=1}{call=--chanflags}{display=Channel Flags}{type=radio} arg {number=2}{call=--interface}{display=Interface}{type=selector} value {arg=0}{range=1,11} value {arg=1}{value=ht40p}{display=HT40+} value {arg=1}{value=ht40m}{display=HT40-} value {arg=1}{value=ht20}{display=HT20} value {arg=2}{value=wlan0}{display=wlan0}Example 2: arg {number=0}{call=--usbdevice}{USB Device}{type=selector} value {arg=0}{call=/dev/sysfs/usb/foo/123}{display=Ubertooth One sn 1234} value {arg=0}{call=/dev/sysfs/usb/foo/456}{display=Ubertooth One sn 8901}Example 3: arg {number=0}{call=--usbdevice}{USB Device}{type=selector} arg {number=1}{call=--server}{display=IP address for log server}{type=string}{validation=(?:\d{1,3}\.){3}\d{1,3}} flag {failure=Permission denied opening Ubertooth device}Example 4: arg {number=0}{call=--username}{display=Username}{type=string} arg {number=1}{call=--password}{display=Password}{type=password} Example 5: arg {number=0}{call=--start}{display=Start Time}{type=timestamp} arg {number=1}{call=--end}{display=End Time}{type=timestamp} Security awareness
SEE ALSOwireshark(1), tshark(1), dumpcap(1), androiddump(1), sshdump(1), randpktdump(1)NOTESExtcap is feature of Wireshark. The latest version of Wireshark can be found at <https://www.wireshark.org>. HTML versions of the Wireshark project man pages are available at: <https://www.wireshark.org/docs/man-pages>.
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