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ng_tee.4freebsd

Langue: en

Version: 300685 (debian - 07/07/09)

Section: 4 (Pilotes et protocoles réseau)


BSD mandoc

NAME

ng_tee - netgraph ``tee'' node type

SYNOPSIS

In sys/types.h In netgraph/ng_tee.h

DESCRIPTION

The tee node type has a purpose similar to the tee(1) command. Tee nodes are useful for debugging or ``snooping'' on a connection between two netgraph nodes. Tee nodes have four hooks, right left right2left and left2right All data received on right is sent unmodified to both hooks left and right2left Similarly, all data received on left is sent unmodified to both right and left2right

Packets may also be received on right2left and left2right if so, they are forwarded unchanged out hooks right and left respectively.

HOOKS

This node type supports the following hooks:
right
The connection to the node on the right.
left
The connection to the node on the left.
right2left
Tap for right to left traffic.
left2right
Tap for left to right traffic.

CONTROL MESSAGES

This node type supports the generic control messages, plus the following.
NGM_TEE_GET_STATS
Get statistics, returned as a struct ng_tee_stats
NGM_TEE_CLR_STATS
Clear statistics.

SHUTDOWN

This node shuts down upon receipt of an NGM_SHUTDOWN control message, or when all hooks have been disconnected. If both right and left hooks are present, node removes itself from the chain gently, connecting right and left together.

SEE ALSO

tee(1), netgraph(4), ngctl(8)

HISTORY

The node type was implemented in Fx 4.0 .

AUTHORS

An Julian Elischer Aq julian@FreeBSD.org
S'il fallait condamner
Tous les ingrats qui sont au monde,
À qui pourrait-on pardonner ?
-+- Jean de La Fontaine (1621-1695),
L'Homme et la Couleuvre (Fables X.1) -+-