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From: Jun Sheng <chaoseternal@gmail.com>
Date: Sun,  2 Nov 2014 23:23:26 +0800
Message-Id: <1414941807-5080-1-git-send-email-chaoseternal@gmail.com>
Subject: [Qemu-devel] [PATCH] [v2] inetd enabled qemu-nbd
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To: qemu-devel@nongnu.org
Cc: Jun Sheng <chaoseternal@gmail.com>

run qemu-nbd as an inetd service has some benefits
* more scriptable, such as serve multiple images to different clients
on one ip/port
* access control using tcpd

simple usage:
#!/bin/sh
# qemu-nbd wrapper, select image file according to client ip address
IMG_FILE=`sed -n "s/$REMOTE_HOST //p" /path/to/image_list.txt`
qemu-nbd -i 10 $IMG_FILE 10<&0- 1>/tmp/log 2>/tmp/log2

#end

#xinetd.conf
service nbd
{
        flags                   = REUSE
        socket_type             = stream
        wait                    = no
        user                    = some_user
        server                  = /path/to/qemu-nbd-wrapper.sh
        log_on_failure          += USERID
        disable                 = no
}

Signed-off-by: Jun Sheng <chaoseternal@gmail.com>