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CHANGES - OpenPrinting cups-browsed v2.1.0 - 2024-10-17

CHANGES IN V2.1.0 (17th October 2024)

  • Removed support for legacy CUPS browsing and for LDAP Legacy CUPS browsing is not needed any more and, our implementation accepting any UDP packet on port 631, causes vulnerabilities, and our LDAP support is does not comly with RFC 7612 and is therefore limited. Fixes CVE-2024-47176 and CVE-2024-47850

  • Default BrowseRemoteProtocols should not include cups protocol Works around CVE-2024-47176, the fix is the complete removal of legacy CUPS Browsing functionality

  • Do not generate PPD for remote raw queues If the destination queue is raw, the local queue generated by cups-browsed should also be raw (Pull request #44).

  • daemon/cups-browsed.service: Add system-cups.slice The system-cups.slice file is not required. The system-cups slice will be automatically created if the file is missing (cups Pull request #1035, Pull request #35).

  • cups-browsed.c: Remove duplicate #include ... Pull request #40

CHANGES IN V2.0.1 (15th August 2024)

  • Ignore attributes with IPP_TAG_NOVALUE We don't need to record attributes with IPP_TAG_NOVALUE value tag, cupsd will decide what to use based on the incoming document (Pull request #33).

  • Ignore attributes with empty values Previously, if IPP attribute value was empty, cups-browsed saved the attribute as printer option "=0", e.g. orientation-requested=0. Often 0 is invalid and as no cluster member printer has this value therefore a job with this value gets rejected (Pull request #32).

  • README.md: Use MarkDown for link to bug tracker (Pull request #31)

  • Initialize variables to not get used uninitialized (Pull request #26)

  • Fix memory leak found by valgrind (Pull request #26)

  • Fix the daemon crash when get-printer-attributes fails cups-browsed crashed when it found a remote CUPS queue shared by mDNS on local network, but IPP request for this queue failed. The empty prattrs data structure is later accessed, which causes the crash (Pull request #25).

  • Better handle damage of queues created by cups-browsed cups-browsed-generated print queues are marked with a "cups-browsed=true" attribute. Sometimes it gets lost and the queue not considered cups-browsed-generated any more. As queues with "implicitclass://..." device URI are always from cups-browsed, ignore the missing flag and always restore them as cups-browsed queues, so that cups-browsed assigns a destination printer for each job (Issue #429)

  • Fix build with Avahi disabled (Issue #19, Pull request #20)

CHANGES IN V2.0.0 (22th September 2023)

  • Ensure we always send a valid name to remove_bad_chars() In case the found queue is a CUPS remote queue shared via DNS-SD, the rp_value can be without '/', which leads to cups-browsed crash if it is set to create the local queue based on the remote name (Pull request #13, Fedora Bugzilla #2150035).

  • Use description/location from server if available, otherwise from client When we create a local queue we first check whether we actually got description and location strings from the remote server/printer, if they are empty we do not set empty strings but use the IPP attributes saved locally for our local queue. This way, if the server does not provide description/location and the user sets their own, that one is conserved through reboots and daemon restarts (Issue #323).

CHANGES IN V2.0rc2 (20th June 2023)

  • Fixed cups-browsed getting stuck in busy loop When the function create_queue() fails to create a local print queue and the failure is not intermittent, it sets a global variable to stop the main thread's loop for updating local queues. With the variable not reset no queue updates happened ever again and cups-browsed fell into a busy loop taking up to 100% CPU. We have solved this by doing away with the variable and simply mark these printers as disappeared (Ubuntu bug #2018504.

  • Do not record *-default IPP attributes of local CUPS queues Many of the *-default IPP attributes represent properties already covered by the PPD option defaults which we also record. In addition, there is also print-quality-default where IPP reports draft, normal, and high settings while CUPS only accepts 3, 4, and 5, and on everything else it sets print-quality-default=0 which is invalid and jobs do not get printed. So we stop saving and loading these attributes.

  • Build system: Removed unnecessary lines in Makefile.am Removed the TESTdir and TEST_SCRIPTS entries in Makefile.am. They are not needed and let make install try to install run-tests.sh in the source directory, where it already is, causing an error.

  • run-tests.sh: Use pkgconfig instead of deprecated cups-config (Pull request #9).

CHANGES IN V2.0rc1 (12th April 2023)

  • Prefer sending jobs in Apple Raster instead of in PDF If a destination printer supports both PDF and Apple Raster, and if it is not a remote CUPS queue, prefer sending the job in Apple Raster, as printers print this more reliably.

    https://bugs.launchpad.net/bugs/2014976

  • run-tests.sh: Let emulated printers support PDF input To test that cups-browsed prefers Apple Raster when the printer supports both PDF and Apple Raster as input format, we let the printers emulated by ippeveprinter also support PDF.

  • implicitclass backend: NULL-initialize filter data field for Raster header We are running a filter chain without PPD file, so we do not have Raster header, so initialize it to NULL.

CHANGES IN V2.0b4 (16th March 2023)

  • Added test script for make test/make check, CI, autopkgtest, ... The script test/run-tests.sh creates emulations of IPP printers via ippeveprinter (of CUPS 2.x) and checks whether cups-browsed creates corresponding CUPS queues, whether a job to such a queue gets actually printed, and whether cups-browsed removes the queues again when the printers are shut down.

  • implicitclass backend: If no destination got reported by cups-browsed, retry after one minute, not the standard 5 minutes of CUPS.

  • debug_printf(): Check for need of log rotation only if log file is set and opened, to avoid a crash.

  • on_printer_modified(): Added NULL check to avoid a crash.

  • ipp_discoveries_add(): Ignore duplicate entries. These are most probably caused by a bug in Avahi, having certain discoveries of a printer reported twice and others not. When the printer disappears Avahi reports the disappearal of each discovery correctly, leaving the duplicate entry untreated (removing only one instance of it) and cups-browsed assumes that the printer is still there, keeping its CUPS queue.

  • update_cups_queues(): Reset counter for pausing CUPS queue updates. Otherwise after having updated the number of queues supposed to be the maximum for one run of update_cups_queues(), cups-browsed will never update any queue again.

  • resolve_callback()/resolver_wrapper(): New thread only when printer found We move the check which resolver event we have (found/failure) already in the main thread (resolver_wrapper()) and launch a new thread only if we have found a new printer and have to investigate whether to add a queue for it or not. resolve_callback() only initiates this investigation now. This way we do not need to pass the resolver data structure (of type AvahiServiceResolver*) into the new thread, which caused segfaults.

  • create_remote_printer_entry(): Corrected some memory freeing when a printer data structure is deleted, but this has not caused a segfault in the recent tests.

  • Fixed issues reported by Red Hat Coverity tool (Pull request #6)

  • configure.ac: Change deprecated AC_PROG_LIBTOOL for LT_INIT (Pull request #5)

  • configure.ac: cups-browsed doesn't need C++

CHANGES IN V2.0b3 (31st January 2023)

  • COPYING, NOTICE: Simplification for autotools-generated files autotools-generated files can be included under the license of the upstream code, and FSF copyright added to upstream copyright list. Simplified COPYING appropriately.

  • Makefile.am: Include LICENSE in distribution tarball

CHANGES IN V2.0b2 (8th January 2023)

  • cups-browsed is not part of cups-filters any more. Reflect this in screen messages and comments in cups-browsed.c.

  • Makefile.am: Include NOTICE in distribution tarball

  • configure.ac: Added "foreign" to to AM_INIT_AUTOMAKE() call. Makes automake not require a file named README.

  • Cleaned up .gitignore

  • Tons of fixes in the source code documentation: README.md, INSTALL, DEVELOPING.md, CONTRIBUTING.md, COPYING, NOTICE, ... Adapted to the libcupsfilters component, added links.

CHANGES IN V2.0b1 (18th November 2022)

  • Added multi-threaded operation, the Avahi resolver callback (which examines the remote printer, registers it, checks whether we want a local queue for it, adds it to a cluster, ...) and the creation/modification of a local CUPS queue is now done in separate threads, so that these processes can get executed in parallel to keep the local queues up-to-date more timely and to not overload the system's resources. Thanks a lot to Mohit Mohan who did this work as Google Summer of Code 2020 project.

  • Let the implicitclass backend use filter functions instead of calling filter executables.

  • Build system, README.md: Require CUPS 2.2.2+. Removed now unneeded ./configure switches for old CUPS versions.

  • Build system: Remove '-D_PPD_DEPRECATED=""' from the compiling command lines of the source files which use libcups. The flag is not supported any more for longer times already and all the PPD-related functions deprecated by CUPS have moved into libppd now.

  • Build system: Add files in gitignore that are generated by "autogen.sh", "configure", and "make" (Pull request #336).

  • implicitclass: Added "#include <signal.h>" (Issue #335).