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IPP-USB(8) ipp-usb.8 IPP-USB(8) NAME ipp-usb - Daemon for IPP over USB printer support DESCRIPTION ipp-usb daemon enables driver-less printing and scanning on USB-only AirPrint-compatible printers and MFPs. It works by connecting to the device by USB using IPP-over-USB proto- col, and exposing the device to the network, including DNS-SD (Zero- Conf) advertising. IPP printing, eSCL scanning and web console are fully supported. SYNOPSIS Usage: ipp-usb mode [options] Modes are: standalone run forever, automatically discover IPP-over-USB devices and serve them all udev like standalone, but exit when last IPP-over-USB device is dis- connected debug logs duplicated on console, -bg option is ignored check check configuration and exit. It also prints a list of all con- nected devices status print status of the running ipp-usb daemon, including informa- tion of all connected devices Options are -bg run in background (ignored in debug mode) NETWORKING Essentially, ipp-usb makes printer or scanner accessible from the net- work, converting network-side HTTP operations to the USB operations. By default, ipp-usb exposes device only to the loopback interface, us- ing the localhost address (both 127.0.0.1 and ::1, for IPv4 and IPv6, respectively). TCP ports are allocated automatically, and allocation is persisted in the association with the particular device, so the next time the device is plugged on, it will get the same port. The default port range for TCP ports allocation is 60000-65535. This default behavior can be changed, using configuration file. See CONFIGURATION section below for details. If you decide to publish your device to the real network, the following things should be taken into consideration: 1. Your private device will become public and it will become accessi- ble by other computers from the network 2. Firewall rules needs to be updated appropriately. The ipp-usb dae- mon will not do it automatically by itself 3. IPP over USB specification explicitly require that the Host field in the HTTP request is set to localhost or localhost:port. If de- vice is accessed from the real network, Host header will reflect the real network address. Most of devices allow it, but some are more restrictive and will not work in this configuration. DNS-SD (AVAHI INTEGRATION) IPP over USB is intended to be used with the automatic device discov- ery, and for this purpose ipp-usb advertises all devices it handles, using DNS-SD protocol. On Linux, DNS-SD is handled with a help of Avahi daemon. DNS-SD advertising can be disabled via configuration file. Also, if Avahi is not installed or not running, ipp-usb will still work cor- rectly, although DNS-SD advertising will not work. For every device the following services will be advertised: +-------------+---------------+---------------------------+ | Instance | Type | Subtypes | +-------------+---------------+---------------------------+ | Device name | _ipp._tcp | _universal._sub._ipp._tcp | +-------------+---------------+---------------------------+ | Device name | _printer._tcp | | +-------------+---------------+---------------------------+ | Device name | _uscan._tcp | | +-------------+---------------+---------------------------+ | Device name | _http._tcp | | +-------------+---------------+---------------------------+ | BBPP | _ipp-usb._tcp | | +-------------+---------------+---------------------------+ Notes: O Device name is the name under which device appears in the list of available devices, for example, in the printing dialog (it is DNS-SD device name, in another words), and for most of devices will match the device's model name. It is appended with the " (USB)" suffix, so if device is connected via network and via USB simulta- neously, these two connections can be easily distinguished. If there are two devices with the same name connected simultaneously, the suffix becomes " (USB NNN)", with NNN number unique for each device, for disambiguation. In another words, the single "Kyocera ECOSYS M2040dn" device will be listed as "Kyocera ECOSYS M2040dn (USB)", and two such a devices will be listed as "Kyocera ECOSYS M2040dn (USB 1)" and "Kyocera ECOSYS M2040dn (USB 2)" O _ipp._tcp and _printer._tcp are only advertises for printer devices and MFPs O _uscan._tcp is only advertised for scanner devices and MFPs O for the _ipp._tcp service, the _universal._sub._ipp._tcp subtype is also advertised for iOS compatibility O _printer._tcp is advertised with TCP port set to 0. Other services are advertised with the actual port number O _http._tcp is device web-console. It is always advertises in as- sumption it is always exist O BBPP, used for the _ipp-usb._tcp service, is the USB bus (BB) and port (PP) numbers in hex. The purpose of this advertising is to help CUPS and other possible "clients" to guess which devices are handled by the ipp-usb service, to avoid possible conflicts with the legacy USB drivers. CONFIGURATION ipp-usb searched for its configuration file in two places: 1. /etc/ipp-usb/ipp-usb.conf 2. ipp-usb.conf in the directory where executable file is located Configuration file syntax is very similar to .INI files syntax. It con- sist of named sections, and each section contains a set of named vari- ables. Comments are started from # or ; characters and continues until end of line: # This is a comment [section 1] variable 1 = value 1 ; and another comment variable 2 = value 2 Network parameters Network parameters are all in the [network] section: [network] # TCP ports for HTTP will be automatically allocated in the # following range http-min-port = 60000 http-max-port = 65535 # Enable or disable DNS-SD advertisement dns-sd = enable # enable | disable # Network interface to use. Set to `all` if you want to expose you # printer to the local network. This way you can share your printer # with other computers in the network, as well as with iOS and # Android devices. interface = loopback # all | loopback # Enable or disable IPv6 ipv6 = enable # enable | disable Authentication By default, ipp-usb exposes locally connected USB printer to all users of the system. Though this is reasonable behavior in most cases, when computer and printer are both in personal use, for bigger installation this approach can be too simple and primitive. ipp-usb provides a mechanism, which allows to control local clients ac- cess based on UID the client program runs under. Please note, this mechanism will not work for remote connections (dis- abled by default but supported). Authentication of remote users re- quires some different mechanism, which is under consideration but is not yet implemented. Authentication parameters are all in the [auth uid] section: # Local user authentication by UID/GID [auth uid] # Syntax: # operations = users # # Operations are comma-separated list of following operations: # all - all operations # config - configuration web-console # fax - faxing # print - printing # scan - scanning # # Users have the following suntax: # user - user name # @group - all users that belongs to the group # # Users and groups may be specified either by names or by # numbers. * means any # # Note, if user/group is not known in the context of request # (for example, in the case of non-local network connection), # "_" used for matching # # User/group names are resolved at the moment of request # processing (and cached for a couple of seconds), so running # daemon will see changes to the /etc/passwd and /etc/group # # Examples: # fax, print = lp, @lp # Allow CUPS to do its work # scan = * # Allow any user to scan # config = @wheel # Only wheel group members can do that all = * Logging configuration Logging parameters are all in the [logging] section: [logging] # device-log - what logs are generated per device # main-log - what common logs are generated # console-log - what of generated logs goes to console # # parameter contains a comma-separated list of # the following keywords: # error - error messages # info - informative messages # debug - debug messages # trace-ipp, trace-escl, trace-http - very detailed # per-protocol traces # trace-usb - hex dump of all USB traffic # all - all logs # trace-all - alias to all # # Note, trace-* implies debug, debug implies info, info implies # error device-log = all main-log = debug console-log = debug # Log rotation parameters: # log-file-size - max log file before rotation. Use suffix # M for megabytes or K for kilobytes # log-backup-files - how many backup files to preserve during # rotation # max-file-size = 256K max-backup-files = 5 # Enable or disable ANSI colors on console console-color = enable # enable | disable # ipp-usb queries IPP printer attributes at the initialization time # for its own purposes and writes received attributes to the log. # By default, only necessary attributes are requested from device. # # If this parameter is set to true, all printer attributes will # be requested. Normally, it only affects the logging. However, # some enterprise-level HP printers returns such huge amount of # data and do it so slowly, so it can cause initialization timeout. # This is why this feature is not enabled by default get-all-printer-attrs = false # false | true Quirks Some devices, due to their firmware bugs, require special handling, called device-specific quirks. ipp-usb loads quirks from the /usr/share/ipp-usb/quirks/*.conf files and from the /etc/ipp-usb/quirks/*.conf files. The /etc/ipp-usb/quirks directory is for system quirks overrides or admin changes. These files have .INI-file syntax with the content that looks like this: [HP LaserJet MFP M28-M31] http-connection = keep-alive [HP OfficeJet Pro 8730] http-connection = close [HP Inc. HP Laser MFP 135a] blacklist = true # Default configuration [*] http-connection = "" For each discovered device, its model name is matched against sections of the quirks files. Section names may contain glob-style wildcards: * that matches any sequence of characters and ? , that matches any single character. To match one of these characters (* and ?) literally, use backslash as escape. Note, the simplest way to guess the exact model name for the particular device is to use ipp-usb check command, which prints a list of all con- nected devices. All matching sections from all quirks files are taken in consideration, and applied in priority order. Priority is computed using the following algorithm: O When matching model name against section name, amount of non-wild- card matched characters is counted, and the longer match wins O Otherwise, section loaded first wins. Files are loaded in alphabet- ical order, sections read sequentially If some parameter exist in multiple sections, used its value from the most priority section The following parameters are defined: O blacklist = true | false If true, the matching device is ignored by the ipp-usb O http-XXX = YYY Set XXX header of the HTTP requests forwarded to device to YYY. If YYY is empty string, XXX header is removed O usb-max-interfaces = N Don't use more that N USB interfaces, even if more is available O disable-fax = true | false If true, the matching device's fax capability is ignored O init-reset = none | soft | hard How to reset device during initialization. Default is none O init-delay = NNN Delay, in milliseconds, between device is opened and, optionally, reset, and the first request is sent to device O request-delay = NNN Delay, in milliseconds, between subsequent requests O ignore-ipp-status = true | false If true, IPP status of IPP requests sent by the ipp-usb by itself will be ignored. This quirk is useful, when device correctly han- dles IPP request but returned status is not reliable. Affects only ipp-usb initialization. If you found out about your device that it needs a quirk to work prop- erly or it does not work with ipp-usb at all, although it provides IPP-over-USB interface, please report the issue at https://github.com/OpenPrinting/ipp-usb. It will let us to update our collection of quirks, so helping other owners of such a device. FILES O /etc/ipp-usb/ipp-usb.conf: the daemon configuration file O /var/log/ipp-usb/main.log: the main log file O /var/log/ipp-usb/<DEVICE>.log: per-device log files O /var/ipp-usb/dev/<DEVICE>.state: device state (HTTP port alloca- tion, DNS-SD name) O /var/ipp-usb/lock/ipp-usb.lock: lock file, that helps to prevent multiple copies of daemon to run simultaneously O /var/ipp-usb/ctrl: ipp-usb control socket. Currently only used to obtain the per-device status (printed by ipp-usb status), but its functionality may be extended in a future O /usr/share/ipp-usb/quirks/*.conf: device-specific quirks (see above) O /etc/ipp-usb/quirks/*.conf: device-specific quirks defined by sysadmin (see above) COPYRIGHT Copyright (c) by Alexander Pevzner (pzz@apevzner.com, pzz@pzz.msk.ru) All rights reserved. This program is licensed under 2-Clause BSD license. See LICENSE file for details. SEE ALSO cups(1) November 2023 IPP-USB(8)
NAME | DESCRIPTION | SYNOPSIS | NETWORKING | DNS-SD (AVAHI INTEGRATION) | CONFIGURATION | FILES | COPYRIGHT | SEE ALSO
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