NAME

cec – coraid ethernet console server

SYNOPSIS

bind #© /dev
/dev/ceccfg
/dev/cecctl
/dev/cecdbg
/dev/cecstat

DESCRIPTION

Cec exports a machines console over raw ethernet frames. See cec(8) for a client.
The read–only file ceccfg lists the interfaces on which cec is configured, one per line.
The write–only cecctl accepts control messages. The command
cecon ethern
turns on a cec listener for ethern, while
cecoff ethern
turns that listener off. The command
namestring
sets the name of the current machine name to string while
shelf n
sets the shelf number in Toffer messages. The default name is the empty string and the default shelf number is –1. These parameters are listed in the available servers presented by cec(8). The command
password string
sets the connection password. The cec protocol transmits passwords in the clear. This is not real security. The strings traceon and traceoff control cec tracing.
Debugging output is available in the read–only file cecdbg.
The file cecstat lists each connection in the following format
000e0c06a37c    25 open               0 0 0 00000000
The 7 fields are ethernet mac address, the connection number, the connection state ( unused, initb, login, open), the number of idle ticks, the number of retires and the address of the current outstanding message's Block*. Fields 4–7 are likely to change in the future.

EXAMPLE

Start cec on ports with no ip stack.
bind –a '#©' /dev
for(i in `{seq 1 10}){
if(test –e '#l'^$i)
if(! test –e /net*/ether^$i)
echo 'cecon #l'^$i>/dev/cecctl
}

SEE ALSO

cec(8),

SOURCE

/sys/src/9/port/devcec.c

BUGS

Cec is not available before ethernet has started or from 9load.
The cecstat format is neither fixed–width nor are fields 4–7 very useful.