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Extcap is an interface specification that allows Wireshark to configure and control an external utility, a script or a binary) to produce a pcap stream over a pipe that represents data captured from some source other than a "standard" network interface.

The documentation includes the extcap man page and code in the Wireshark source code tree which includes the script the extcap headers; extcap.c and extcap.h and the files in the extcap directory.