LPRng Reference Manual: 3 May 2004 (For LPRng-3.8.27)
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# 17.9. RFC1179 Protocol Extensions

The RFC1179 protocol specifies that a lpd server command sent on a connection has the form:

        \nnn[additional fields]\n

\nnn is a one octet (byte) value with the following meaning:

        REQ_START   1    start printer
        REQ_RECV    2    transfer a printer job
        REQ_DSHORT  3    print short form of queue status
        REQ_DLONG   4    print long form of queue status
        REQ_REMOVE  5    remove jobs

The LPRng system extends the protocol with the following additional types:

        REQ_CONTROL 6    do control operation
        REQ_BLOCK   7    transfer a block format print job
        REQ_SECURE  8    do operation with authentication

The REQ_CONTROL allows a remote user to send LPC commands to the server. The REQ_BLOCK provides an alternate method to transfer a job. Rather than transferring the control and data files individually, this format transfers one file. The REQ_AUTH provides a mechanism for providing an authentication mechanism and is described in this document.

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