Provided by: sane-airscan_0.99.27-1build1_amd64 
NAME
sane-airscan - SANE backend for AirScan (eSCL) and WSD scanners and MFP
DESCRIPTION
The sane-airscan is the universal backend for "driverless" document scanning. Currently it
supports two protocols:
1. eSCL, also known as AirScan or AirPrint scan
2. WSD, also known as WS-Scan
CONFIGURATION
The sane-airscan loads its configuration files from the following places:
1. /etc/sane.d/airscan.conf
2. /etc/sane.d/airscan.d/*
The configuration file syntax is very similar to the .INI file syntax. It consist of
sections, each section contains some variables. Comments are started from # or ;
characters and continies until end of line
# This is a comment
[section 1]
variable 1 = value 1 ; and another comment
variable 2 = value 2
Leading and trailing spaces of variable name and value are striped. If you want to
preserve them, put name or value into quotes ("like this").
CONFIGURATION OF DEVICES
If scanner and computer are connected to the same LAN segment, everything expected to
"just work" out of box, without any need of manual configuration.
However, in some cases manual configuration can be useful. For example:
1. If computer and scanner are connected via IP router
2. There are a lot of devices on a corporate network, but
only few of them are interesting
3. Automatic discovery works unreliable
To manually configure a device, add the following section to the configuration file:
[devices]
"Kyocera eSCL" = http://192.168.1.102:9095/eSCL, eSCL
"Kyocera WSD" = http://192.168.1.102:5358/WSDScanner, WSD
"Device I do not want to see" = disable
The [devices] section contains all manually configured devices, one line per device, and
each line contains a device name on a left side of equation and device URL on a rights
side, followed by protocol (eSCL or WSD). If protocol is omitted, eSCL is assumed. You may
also disable particular device by using the disable keyword instead of URL.
In addition, you can manually configure a device by directly passing its URL in a device
name without adding it to the configuration file. This takes the format protocol:Device
Name:URL. The examples above could be written as escl:Kyocera
eSCL:http://192.168.1.102:9095/eSCL and wsd:Kyocera
WSD:http://192.168.1.102:5358/WSDScanner.
To figure out URLs of available devices, the simplest way is to run a supplied
airscan-discover tool on a computer connected with scanner to the same LAN segment. On
success, this program will dump to its standard output a list of discovered devices in a
format suitable for inclusion into the configuration file.
If running airscan-discover on same LAN segment as a scanner is not possible, you will
have to follow a hard way. Your administrator must know device IP address, consult your
device manual for the eSCL port, and the URL path component most likely is the "/eSCL",
though on some devices it may differ. Discovering WSD URLs doing this way is much harder,
because it is very difficult to guess TCP port and URL path, that in a case of eSCL.
For eSCL devices, the URL can also use the unix:// scheme, such as
unix://scanner.sock/eSCL. The "host" from the URL is a file name that will be searched for
in the directory specified by socket_dir (see below). When connecting to the scanner, all
traffic will be sent to the specified UNIX socket instead of a TCP connection.
CONFIGURATION OPTIONS
Miscellaneous options all goes to the [options] section. Currently the following options
are supported:
[options]
; If there are a lot of scanners around and you are only
; interested in few of them, disable auto discovery and
; configure scanners manually
discovery = enable | disable
; Choose what SANE apps will show in a list of devices:
; scanner network name (the default) or hardware model name
model = network | hardware
; If device supports both eSCL and WSD protocol, sane-airscan
; may either choose the "best" protocol automatically, or
; expose all variants for user, allowing manual protocol selection.
; The default is "auto"
protocol = auto | manual
; Discovery of WSD devices may be "fast" or "full". The "fast"
; mode works as fast as DNS-SD discovery, but in some cases
; may be unreliable. The "full" mode is slow and reliable.
; This is also possible to disable automatic discovery
; of WSD devices. The default is "fast".
ws-discovery = fast | full | off
; Scanners that use the unix:// schema in their URL can only specify a
; socket name (not a full path). The name will be searched for in the
; directory specified here. The default is /var/run.
socket_dir = /path/to/directory
BLACKLISTING DEVICES
This feature can be useful, if you are on a very big network and have a lot of devices
around you, while interesting only in a few of them.
[blacklist]
model = "Xerox*" ; blacklist by model name
name = "HP*" ; blacklist by network name
ip = 192.168.0.1 ; blacklist by address
ip = 192.168.0.0/24 ; blacklist the whole subnet
Network names come from DNS-SD, WS-Discovery doesn´t provide this information. For
filtering by network name to work, Avahi must be enabled and device must be discoverable
via DNS-SD (not necessarily as a scanner, it´s enough if WSD scanner is discoverable as a
printer via DNS-SD).
Blacklisting only affects automatic discovery, and doesn´t affect manually configured
devices
DEBUGGING
sane-airscan provides very good instrumentation for troubleshooting without physical
access to the problemmatic device.
Debugging facilities can be controlled using the [debug] section of the configuration
file:
[debug]
; Enable or disable console logging
enable = false | true
; Enable protocol trace and configure output directory
; for trace files. Like in shell, to specify path relative to
; the home directory, start it with tilda character, followed
; by slash, i.e., "~/airscan/trace". The directory will
; be created automatically.
trace = path
; Hex dump all traffic to the trace file (very verbose!)
hexdump = false | true
FILES
/etc/sane.d/airscan.conf, /etc/sane.d/airscan.d/*
The backend configuration files
/usr/LIBDIR/sane/libsane-airscan.so
The shared library implementing this backend
ENVIRONMENT
SANE_DEBUG_AIRSCAN
This variable if set to true or non-zero numerical value, enables debug messages,
that are printed to stdout
SANE_CONFIG_DIR
This variable alters the search path for configuration files. This is a
colon-separated list of directories. These directories are searched for the
airscan.conf configuration file and for the airscan.d subdirectory, before the
standard path (/etc/sane.d) is searched.
BUGS AND SUPPORT
If you have found a bug, please file a GitHub issue on a GitHub project page:
https://github.com/alexpevzner/sane-airscan
SEE ALSO
sane(7), scanimage(1), xsane(1), airscan-discover(1)
AUTHOR
Alexander Pevzner <pzz@apevzner.com>
May 2021 SANE-AIRSCAN(5)