I have talked with the upstream maintainer of ipp-usb, Alexander Pevzner
now and he will emove the dependency on ini.v1.
** Changed in: golang-github-openprinting-goipp (Ubuntu)
Status: Incomplete => New
** Changed in: golang-gopkg-ini.v1 (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/1891157
Title:
[MIR] ipp-usb
Status in golang-github-openprinting-goipp package in Ubuntu:
New
Status in golang-gopkg-ini.v1 package in Ubuntu:
Invalid
Status in ipp-usb package in Ubuntu:
New
Bug description:
IPP-over-USB
------------
ipp-usb is the second implementation of the IPP-over-USB standard.
This allows the PWG's Internet Printing Protocol (IPP) which is
currently the most common communication protocol for network printers
also to be used via USB, simply by a network printer being emulated on
localhost. Advantages are:
- IPP is a high-level bi-directional packet-based protocol for printing,
scanning, and fax
- Full device capabilities can be polled from the device, together with
using standardized
printing and scanning data format driverless printing and scanning is
possible
- Status, like loaded paper, toner levels, ... can get polled
- Printing and scanning can be performed simultaneously and independently
- The administration web interface can get accessed
ipp-usb detects supported devices automatically and advertises their
full functionality via DNS-SD on localhost, CUPS and the appropriate
SANE backends discover the device automatically then and it is
immediately available, no drivers needed, it just works.
This makes thousands of printers, scanners, and multi-function devices
work on USB, USB-only devices, like the scanner Canon Lide 400 get
working for the first time.
Why ipp-usb? There is ippusbxd already
--------------------------------------
ippusbxd was the first implementation of IPP-over-USB, with the very
same intentions, but it has problems which were not easily to be
solved in C and so after a short discussion with me the author of the
driverless scanning SANE backend sane-airscan
(https://github.com/alexpevzner/sane-airscan) created a first draft of
ipp-usb in Go within a few hours, which solved these problems. The
project has matured with the time and seems to work perfectly.
See also here:
https://github.com/OpenPrinting/ippusbxd#before-you-begin-ippusbxd-or-
ipp-usb
See the original README for the rationale of ipp-usb:
https://github.com/OpenPrinting/ipp-usb
----------
Unfortunately, the naive implementation, which simply relays a TCP connection
to USB, does not work. It happens because closing the TCP connection on the
client side has a useful side effect of discarding all data sent to this
connection from the server side, but it does not happen with USB connections.
In the case of USB, all data not received by the client will remain in the USB
buffers, and the next time the client connects to the device, it will receive
unexpected data, left from the previous abnormally completed request.
Actually, it is an obvious flaw in the IPP-over-USB standard, but we
have to live with it.
So the implementation, once the HTTP request is sent, must read the
entire HTTP response, which means that the implementation must
understand the HTTP protocol, and effectively implement a HTTP reverse
proxy, backed by the IPP-over-USB connection to the device.
And this is what the ipp-usb program actually does.
----------
Many users reported this to work perfectly and I am using it since its
creation in January 2020 on a daily basis without problems.
Here are the issues of ippusbxd:
https://github.com/OpenPrinting/ippusbxd/issues
Especially
https://github.com/OpenPrinting/ippusbxd/issues/15
shows that packets of canceled connections can get stuck in buffer and
spilled out on next connection. Problems of ippusbxd's architecture
and lack of useful C libraries to solve this is discussed here.
https://github.com/OpenPrinting/ippusbxd/issues/14
The flakiness of the web admin interface is caused by above problems.
Due to this most other Linux distributions are also migrating to ipp-
usb. Chrome OS was the last system sticking with ippusbxd but they
have introduced their own replacement, ippusb_bridge
(https://github.com/dgreid/platform2/tree/master/ippusb_bridge) now.
From the README.md of ippusb_bridge:
----------
The impetus for creating this was that ippusbxd has lost a lot of interest
since the release of ipp-usb, a similar project written in Golang. Upstream
provides only some oversight, and the code is pure C and has security bugs.
----------
With this the interest in ippusbxd has gone and ippusbxd can get
considered deprecated.
goipp
-----
goipp (Debian/Ubuntu package: golang-github-openprinting-goipp) is a
simple IPP support library in Go needed by ipp-usb and created
together with ipp-usb.
Original description from
https://github.com/OpenPrinting/goipp:
----------
The goipp library is fairly complete implementation of IPP core protocol in
pure Go. Essentially, it is IPP messages parser/composer. Transport is not
implemented here, because Go standard library has an excellent built-in HTTP
client, and it doesn't make a lot of sense to wrap it here.
High-level requests, like "print a file" are also not implemented, only the
low-level stuff.
----------
[Availability]
Both ipp-usb and goipp got initially packaged in Debian and synced
into Universe:
https://launchpad.net/ubuntu/+source/ipp-usb/0.9.10-2
https://launchpad.net/ubuntu/+source/golang-github-openprinting-goipp/0.0~git20200517.da79ff1-3
They build on all currently supported architectures.
[Rationale]
See introduction above. Replaces ippusbxd.
[Security]
For both ipp-usb and goipp:
No CVE on http://cve.mitre.org/cve/search_cve_list.html
No mention on https://www.openwall.com/lists/oss-security/
Not listed on http://people.ubuntu.com/~ubuntu-
security/cve/universe.html
No SUID/SGID
ipp-usb is a system daemon, running as root, triggered by plugging a
supported device (USB printing device with IPP protocol, 7/1/4) via
UDEV and systemd. In default configuration the daemon listens only on
localhost, port 60000 (and following ports if more than one device is
connected). So the device is not exposed to the network and
communication with it stays on the local machine.
goipp is a Go library, the only binary package of it, golang-github-
openprinting-goipp-dev contains only Go source code and documentation.
[Quality assurance]
To use ipp-usb one simply installs it and plugs the device(s) to USB.
The devices get auto-detected by UDEV and the daemon automatically
started. It immediately advertises the device via DNS-SD only on
localhost where CUPS and SANE auto-discover it. So it immediately gets
available for the user, for both printing and scanning.
goipp is a Go library only needed to build ipp-usb, it does not need
to be installed by the end user.
Both packages do not use debconf at all.
Both ipp-usb and goipp are maintained upstream very well and actively
developed.
Upstream site:
https://github.com/OpenPrinting/ipp-usb
https://github.com/OpenPrinting/gipp
Recent commits:
https://github.com/OpenPrinting/ipp-usb/commits/master
https://github.com/OpenPrinting/goipp/commits/master
Bugs:
https://github.com/OpenPrinting/ipp-usb/issues
https://github.com/OpenPrinting/goipp/issues
(only closed ones in ipp-usb currently, none at all in goipp)
The author of both, Alexander Pevzner, is very responsive, usually
answers on the same day. He is actively working on driverless scanning
(will mentor 2 students in LFMP on IPP Scan in Sep-Nov).
No known bugs in Debian and Ubuntu (Launchpad only lists this MIR for
both).
Debian maintainer OdyX also very responsive.
No exotic hardware required, is for supporting the absolute standard
hardware, most modern printers and multi-function devices, even very
cheap ones. See introduction above.
Both packages have debian/watch files and the content of the files
seems to be correct.
No dependencies on obsolete stuff.
[Dependencies]
ipp-usb build-depends on goipp, therefore this MIR is for both. They
both were developed together and there is (yet) no other consumer than
ipp-usb for goipp.
Otherwise build-depends on usual Go stack.
Run-time dependencies are only Avahi and libusb which are all in Main.
Avahi needs to support localhost, but Ubuntu's Avahi does this already
for some years.
[Standards compliance]
Packages fulfill the standards concerning FHS and Go. Both ipp-usb and
goipp packages declare Debian's "Standards-Version" as 4.5.0, Debian
maintainer takes care of verifying and updating this. debian/
directories and debian/rules files are simple, fairly standard.
[Maintenance]
See [Quality assurance] above for upstream and Debian maintenance. I
have subscribed myself to bugs in both packages and also the Ubuntu
Printing Team. Also "Desktop Packages" (~desktop-packages) is
subscribed to sane-airscan.
[Background information]
See introduction above.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/golang-github-openprinting-goipp/+bug/1891157/+subscriptions
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