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[193.154.187.225]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-47fd4562667sm19412168f8f.24.2026.08.01.14.48.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 01 Aug 2026 14:48:32 -0700 (PDT) Message-ID: Date: Sat, 1 Aug 2026 23:48:31 +0200 Precedence: bulk X-Mailing-List: printing-architecture@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Recommended way to manually add an undiscovered IPP printer in CUPS 3.x From: Till Kamppeter To: Michael Sweet , AbdElRahman Khalifa Cc: printing-architecture@lists.linux.dev References: Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Abdelrahman, I think now I see how the concept in CUPS 3.x is meant: First, in "Add Printer" you do not only allow to look for legacy printers to assign Printer Applications to, but you also look for driverless network printers which are not visible due to mDNS/DNS-SD not running or the printer being in a network not being your local one. So in "Add Printer" you give the options as I suggested before: On 8/1/26 21:50, Till Kamppeter wrote: > Abdelrahman, > > If there is no mDNS/DNS-SD active you can do: > > 1. Put an option into the "Add Printer" part where the user only enters the IP > (or host name) of the printer. It could then try get-printer-attributes on > - ipps://IP:443/ > - ipps://IP:631/ > - ipp://IP:631/ > - ipps://IP:8000/ > - ipp://IP:8000/ > - ipps://IP:8001/ > - ipp://IP:8001/ > - ... > > Test 1 and 3 are for network printers, 2 and 3 for remote CUPS servers, 4+ for > remote Printer Applications. > > 2. Also test > - ipp://localhost:60000/ > - ipp://localhost:60001/ > - ... > - ipps://localhost:8000/ > - ipp://localhost:8000/ > - ipps://localhost:8001/ > - ipp://localhost:8001/ > - ... > > either automatically in the main view or  by button(s) in "Add Printer". This is > for local IPP-over-USB printers and local Printer Applications. > You also give the option to select a network, to extend IPP printer discovery into that network. For example the user can add the corporate printer VLAN here. Settings will be saved in profiles in ~/.cups/profiles/ You can also add a switch to "Add Printer" to make system-wide settings, then they get saved in /etc/cups/profiles/. Flicking this switch requires authentication for a root operation. So you add to the "Add Printer" part a GUI frontend for defining profiles. The profiles are NOT being used by the running CUPS daemon (local or sharing) but by the function in libcups (cupsEnumDests()) to list available print destinations. All print dialogs will have to use this function (if a dialog uses CPDB it will use this function). So from Michael we need to know what the capabilities and the syntax of the files for profiles are. Also, you can add "Set Option Defaults" buttons to all print destinations in the main view. This button is to be considered as a GUI frontend for the "lpoptions" command (or its libcups API equivalent, see source code of "lpoptions"). So settings get saved in ~/.cups/lpoptions (or with "system-wide" switch and authentication in /etc/cups/lpoptions). Note that these saved options do not require that the daemon has a permanent queue. They are only used by the client side (print dialogs of all portals and toolkits, CPDB, CLI tools). Michael, am I right now? Till