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Author: Archie Cobbs <archie@FreeBSD.org>
$FreeBSD$
$Whistle: ng_tee.8,v 1.4 1999/01/25 23:46:27 archie Exp $
.Dd May 28, 2004 .Dt NG_TEE 4 .Os .Sh NAME .Nm ng_tee .Nd netgraph ``tee'' node type .Sh SYNOPSIS n sys/types.h n netgraph/ng_tee.h .Sh DESCRIPTION The .Nm tee node type has a purpose similar to the .Xr tee 1 command. .Nm Tee nodes are useful for debugging or .Dq snooping on a connection between two netgraph nodes. .Nm Tee nodes have four hooks, .Dv right , .Dv left , .Dv right2left , and .Dv left2right . All data received on .Dv right is sent unmodified to .Em both hooks .Dv left and .Dv right2left . Similarly, all data received on .Dv left is sent unmodified to both .Dv right and .Dv left2right .
p Packets may also be received on .Dv right2left and .Dv left2right ; if so, they are forwarded unchanged out hooks .Dv right and .Dv left , respectively. .Sh HOOKS This node type supports the following hooks: l -tag -width foobarbarfoo t Dv right The connection to the node on the right. t Dv left The connection to the node on the left. t Dv right2left Tap for right to left traffic. t Dv left2right Tap for left to right traffic. .El .Sh CONTROL MESSAGES This node type supports the generic control messages, plus the following. l -tag -width foo t Dv NGM_TEE_GET_STATS Get statistics, returned as a .Dv "struct ng_tee_stats" . t Dv NGM_TEE_CLR_STATS Clear statistics. .El .Sh SHUTDOWN This node shuts down upon receipt of an .Dv NGM_SHUTDOWN control message, or when all hooks have been disconnected. If both .Dv right and .Dv left hooks are present, node removes itself from the chain gently, connecting .Dv right and .Dv left together. .Sh SEE ALSO .Xr tee 1 , .Xr netgraph 4 , .Xr ngctl 8 .Sh HISTORY The .Nm node type was implemented in .Fx 4.0 . .Sh AUTHORS .An Julian Elischer Aq julian@FreeBSD.org