1sane-net(5) SANE Scanner Access Now Easy sane-net(5)
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6 sane-net - SANE network backend
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9 The sane-net library implements a SANE (Scanner Access Now Easy) back‐
10 end that provides access to image acquisition devices through a network
11 connection. This makes it possible to control devices attached to a
12 remote host and also provides a means to grant users access to pro‐
13 tected resources.
14
17 This backend expects device names of the form:
18 host:device
20 Where host is the name (or IP address) of the (remote) host and device
22 is the name of the device on this host that should be addressed. If
23 the device name does not contain a colon (:), then the entire string is
24 treated as the device string for the default host. The default host is
25 the host listed last in the configuration file (see below).
26 An IPv6 address can be specified enclosed in square brackets:
28 [::1]:device
30
32 The net.conf file contains both backend options and a list of host
33 names (or IP addresses) that should be contacted for scan requests.
34 Anything that isn't one of the options listed below will be treated as
35 an host name.
36 connect_timeout = nsecs
38 Timeout (in seconds) for the initial connection to the saned
39 server. This will prevent the backend from blocking for several
40 minutes trying to connect to an unresponsive saned host (network
41 outage, host down, ...). The environment variable SANE_NET_TIME‐
42 OUT can also be used to specify the timeout at runtime.
43 Empty lines and lines starting with a hash mark (#) are ignored. Note
45 that IPv6 addresses in this file do not need to be enclosed in square
46 brackets. A sample configuration file is shown below:
47 scan-server.somedomain.firm
49 192.168.0.1
50 # this is a comment
51 localhost
52 ::1
53 The above list of hosts can be extended at run-time using environment
55 variable SANE_NET_HOSTS. This environment variable is a colon-sepa‐
56 rated list of hostnames or IP addresses that should be contacted in
57 addition to the hosts mentioned in the configuration file. For exam‐
58 ple, a user could set the environment variable to the string:
59 new.scanner.com:[::1]:192.168.0.2:scanner.univ.edu
61 To request that hosts new.scanner.com , [::1] , 192.168.0.2 and scan‐
63 ner.univ.edu are contacted in addition to the hosts listed above.
64 For this backend to function properly, it is also necessary to define
66 the sane-port service in /etc/services. The sane service should be
67 defined using a line of the following form:
68 sane-port 6566/tcp # SANE network scanner daemon
70
72 /etc/sane.d/net.conf
73 The backend configuration file (see also description of
74 SANE_CONFIG_DIR below).
75 /usr/lib64/sane/libsane-net.a
77 The static library implementing this backend.
78 /usr/lib64/sane/libsane-net.so
80 The shared library implementing this backend (present on systems
81 that support dynamic loading).
82
84 SANE_CONFIG_DIR
85 This environment variable specifies the list of directories that
86 may contain the configuration file. Under UNIX, the directories
87 are separated by a colon (`:'), under OS/2, they are separated
88 by a semi-colon (`;'). If this variable is not set, the config‐
89 uration file is searched in two default directories: first, the
90 current working directory (".") and then in /etc/sane.d. If the
91 value of the environment variable ends with the directory sepa‐
92 rator character, then the default directories are searched after
93 the explicitly specified directories. For example, setting
94 SANE_CONFIG_DIR to "/tmp/config:" would result in directories
95 "tmp/config", ".", and "/etc/sane.d" being searched (in this
96 order).
97 SANE_NET_HOSTS
99 A colon-separated list of host names or IP addresses to be con‐
100 tacted by this backend.
101 SANE_NET_TIMEOUT
103 Number of seconds to wait for a response from the saned server
104 for the initial connection request.
105 SANE_DEBUG_NET
107 If the library was compiled with debug support enabled, this
108 environment variable controls the debug level for this backend.
109 E.g., a value of 128 requests all debug output to be printed.
110 Smaller levels reduce verbosity.
111
113 If saned has timed out, the net backend may loop with authorization
114 requests.
115
117 sane(7), saned(8), sane-dll(5), scanimage(1)
118 http://www.penguin-breeder.org/?page=sane-net
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122 David Mosberger and Andreas Beck
123 14 Jul 2008 sane-net(5)