pf_key is a program to open a PF_KEY socket and
print all messages that are received from it. With no
options, it will register itself to receive key requests for
AH, ESP, IPIP and IPCOMP security associations. If given
more specific options, then it will listen only to those
protocols which are listed.
If the messages are recognized, the messages will be
decoded.
If the option −−daemon is provided,
then after doing the registrations, the program will fork
into the background. The provided file will be opened and
the process ID of the background process will be written to
it. This option is present to present race conditions in
regression testing.
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