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sane-net(5) SANE Scanner Access Now Easy sane-net(5) NAME sane-net - SANE network backend DESCRIPTION The sane-net library implements a SANE (Scanner Access Now Easy) back- end that provides access to image acquisition devices through a network connection. This makes it possible to control devices attached to a remote host and also provides a means to grant users access to pro- tected resources. DEVICE NAMES This backend expects device names of the form: host:device Where host is the name (or IP address) of the (remote) host and device is the name of the device on this host that should be addressed. If the device name does not contain a colon (:), then the entire string is treated as the device string for the default host. The default host is the host listed last in the configuration file (see below). An IPv6 address can be specified enclosed in square brackets: [::1]:device CONFIGURATION The net.conf file contains both backend options and a list of host names (or IP addresses) that should be contacted for scan requests. Anything that isn't one of the options listed below will be treated as an host name. connect_timeout = nsecs Timeout (in seconds) for the initial connection to the saned(8) server. This will prevent the backend from blocking for several minutes trying to connect to an unresponsive saned(8) host (net- work outage, host down, ...). The environment variable SANE_NET_TIMEOUT can also be used to specify the timeout at run- time. Empty lines and lines starting with a hash mark (#) are ignored. Note that IPv6 addresses in this file do not need to be enclosed in square brackets. A sample configuration file is shown below: scan-server.somedomain.firm 192.168.0.1 # this is a comment localhost ::1 The above list of hosts can be extended at run-time using environment variable SANE_NET_HOSTS. This environment variable is a colon-sepa- rated list of hostnames or IP addresses that should be contacted in ad- dition to the hosts mentioned in the configuration file. For example, a user could set the environment variable to the string: new.scanner.com:[::1]:192.168.0.2:scanner.univ.edu To request that hosts new.scanner.com , [::1] , 192.168.0.2 and scan- ner.univ.edu are contacted in addition to the hosts listed above. For this backend to function properly, it is also necessary to define the sane-port service in /etc/services using a line of the following form: sane-port 6566/tcp # SANE network scanner daemon FILES /usr/local/etc/sane.d/net.conf The backend configuration file (see also description of SANE_CONFIG_DIR below). /usr/local/lib/sane/libsane-net.a The static library implementing this backend. /usr/local/lib/sane/libsane-net.so The shared library implementing this backend (present on systems that support dynamic loading). ENVIRONMENT SANE_CONFIG_DIR This environment variable specifies the list of directories that may contain the configuration file. On *NIX systems, the direc- tories are separated by a colon (`:'), under OS/2, they are sep- arated by a semi-colon (`;'). If this variable is not set, the configuration file is searched in two default directories: first, the current working directory (".") and then in /usr/lo- cal/etc/sane.d. If the value of the environment variable ends with the directory separator character, then the default direc- tories are searched after the explicitly specified directories. For example, setting SANE_CONFIG_DIR to "/tmp/config:" would re- sult in directories tmp/config, ., and /usr/local/etc/sane.d be- ing searched (in this order). SANE_NET_HOSTS A colon-separated list of host names or IP addresses to be con- tacted by this backend. SANE_NET_TIMEOUT Number of seconds to wait for a response from the saned(8) server for the initial connection request. SANE_DEBUG_NET If the library was compiled with debug support enabled, this en- vironment variable controls the debug level for this backend. E.g., a value of 128 requests all debug output to be printed. Smaller levels reduce verbosity. BUGS If saned(8) has timed out, the net backend may loop with authorization requests. SEE ALSO sane(7), saned(8), sane-dll(5), scanimage(1) http://www.penguin-breeder.org/?page=sane-net AUTHOR David Mosberger and Andreas Beck 14 Jul 2008 sane-net(5)
NAME | DESCRIPTION | DEVICE NAMES | CONFIGURATION | FILES | ENVIRONMENT | BUGS | SEE ALSO | AUTHOR
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