03-31-2009
Can USB Devices Be Exported Over a Network?
While I know that it's possible to use something like SANE to share a USB scanner over a network, or use NBD or iSCSI to share a USB flash or external HD over the network, I've been wondering about a raw USB <--> TCP/IP transport. Back in the late 90s, I swear I remember hearing about a project for the Linux kernel to be able to export USB devices over a network using SCSI packets over TCP. Did this evolve into the iSCSI projects, or is there still something out there that would allow me to take something like a support USB graphics tablet and export the USB device to another host?
My application for this is the thin client model I'm using at home. I use NX for the thin client and FreeNX for the server side. While I can connect my graphics tablet and use it on the thin client with it's local X server, I am not able to have an application like Gimp on the application server recognize my tablet. I think this would only be possible if I could take the raw USB device and export it to the application server which would then map it to the server's /dev/input hierarchy.
However, the uses go farther than that. In general, I'm really just looking for a way to plug a USB device into my thin client (a laptop) and export it to the application server. This would help me out with a number of applications. Anything like that out there?
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LEARN ABOUT NETBSD
sane-find-scanner
sane-find-scanner(1) SANE Scanner Access Now Easy sane-find-scanner(1)
NAME
sane-find-scanner - find SCSI and USB scanners and their device files
SYNOPSIS
sane-find-scanner [-h|-?] [-v] [-q] [-p] [-f] [-F filename] [devname]
DESCRIPTION
sane-find-scanner is a command-line tool to find SCSI and USB scanners and determine their Unix device files. Its primary aim is to make
sure that scanners can be detected by SANE backends.
For SCSI scanners, it checks the default generic SCSI device files (e.g., /dev/sg0) and /dev/scanner. The test is done by sending a SCSI
inquiry command and looking for a device type of "scanner" or "processor" (some old HP scanners seem to send "processor"). So
sane-find-scanner will find any SCSI scanner connected to those default device files even if it isn't supported by any SANE backend.
For USB scanners, first the USB kernel scanner device files (e.g. /dev/usb/scanner0), /dev/usb/scanner, and /dev/usbscanner) are tested.
The files are opened and the vendor and device ids are determined, if the operating system supports this feature. Currently USB scanners
are only found this way if they are supported by the Linux scanner module or the FreeBSD or OpenBSD uscanner driver. After that test,
sane-find-scanner tries to scan for USB devices found by the USB library libusb (if available). There is no special USB class for scanners,
so the heuristics used to distinguish scanners from other USB devices is not perfect. sane-find-scanner also tries to find out the type of
USB chip used in the scanner. If detected, it will be printed after the vendor and product ids. sane-find-scanner will even find USB scan-
ners, that are not supported by any SANE backend.
sane-find-scanner won't find most parallel port scanners, or scanners connected to proprietary ports. Some parallel port scanners may be
detected by sane-find-scanner -p. At the time of writing this will only detect Mustek parallel port scanners.
OPTIONS
-h, -? Prints a short usage message.
-v Verbose output. If used once, sane-find-scanner shows every device name and the test result. If used twice, SCSI inquiry informa-
tion and the USB device descriptors are also printed.
-q Be quiet. Print only the devices, no comments.
-p Probe parallel port scanners.
-f Force opening all explicitly given devices as SCSI and USB devices. That's useful if sane-find-scanner is wrong in determining the
device type.
-F filename
filename is a file that contains USB descriptors in the format of /proc/bus/usb/devices as used by Linux. sane-find-scanner tries
to identify the chipset(s) of all USB scanners found in such a file. This option is useful for developers when the output of "cat
/proc/bus/usb/devices" is available but the scanner itself isn't.
devname Test device file "devname". No other devices are checked if devname is given.
EXAMPLE
sane-find-scanner -v
Check all SCSI and USB devices for available scanners and print a line for every device file.
sane-find-scanner /dev/scanner
Look for a (SCSI) scanner only at /dev/scanner and print the result.
sane-find-scanner -p
Probe for parallel port scanners.
SEE ALSO
sane(7), sane-scsi(5), sane-usb(5), scanimage(1), xscanimage(1), xsane(1), sane-"backendname"(5)
AUTHOR
Oliver Rauch, Henning Meier-Geinitz and others
SUPPORTED PLATFORMS
USB support is limited to Linux (kernel, libusb), FreeBSD (kernel, libusb), NetBSD (libusb), OpenBSD (kernel, libusb). Detecting the vendor
and device ids only works with Linux or libusb.
SCSI support is available on Irix, EMX, Linux, Next, AIX, Solaris, FreeBSD, NetBSD, OpenBSD, and HP-UX.
BUGS
No support for most parallel port scanners yet.
Detection of USB chipsets is limited to a few chipsets.
13 Jul 2008 sane-find-scanner(1)