bind -a #Espec /net /net/sdp/clone /net/sdp/log /net/sdp/ n /net/sdp/ n /data /net/sdp/ n /control /net/sdp/ n /ctl /net/sdp/ n /rstats /net/sdp/ n /stats /net/sdp/ n /status ...
The top level directory contains a clone file, a log file, and subdirectories numbered from zero to the number of connections opened for this protocol.
Opening the clone file reserves a connection. The file descriptor returned from the open (2) will point to the control file, ctl , of the newly allocated connection. Reading ctl returns a text string representing the number of the connection. Connections may be used either to listen for incoming calls or to initiate calls to other machines.
A connection is controlled by writing text strings to the associated ctl file. After a connection has been established data may be read from and written to data . A connection can be actively established using the connect message (see also dial (2)). A connection can be established passively by first using an announce message (see dial (2)) to bind to a local port and then opening the listen file (see dial (2)) to receive incoming calls.
The following control messages are supported: .TF "outsecret secret
accept " file" Accept an incoming encrypted connection on file , typically a data file.
dial " file" Initiate a new encrypted connection on file , typically a UDP data file.
drop " permil" Randomly drop approximately one of every permil output packets, thus simulating network errors.
cipher " algorithm" Use ciphering algorithm ; choices are .LR null , .LR des_56_cbc , .LR rc4_128 , and .LR rc4_256 .
auth " algorithm" Use authentication algorithm ; choices are .LR null , .LR hmac_sha1_96 , and .LR hmac_md5_96 .
comp " algorithm" Use compression algorithm ; choices are .L null and .LR thwack .
insecret " secret" Use secret to decrypt incoming packets.
outsecret " secret" Use secret to encrypt outgoing packets. .
"Robust Data Compression of Network Packets" , Sean Dorward and Sean Quilan, Bell Labs, Lucent Technologies, http://plan9.bell-labs.com/who/seanq/networkcomp.pdf .