1sane-net(5) SANE Scanner Access Now Easy sane-net(5)
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6 sane-net - SANE network backend
7
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(8)
39 server. This will prevent the backend from blocking for several
40 minutes trying to connect to an unresponsive saned(8) host (net‐
41 work outage, host down, ...). The environment variable
42 SANE_NET_TIMEOUT can also be used to specify the timeout at run‐
43 time.
44 Empty lines and lines starting with a hash mark (#) are ignored. Note
46 that IPv6 addresses in this file do not need to be enclosed in square
47 brackets. A sample configuration file is shown below:
48 scan-server.somedomain.firm
50 192.168.0.1
51 # this is a comment
52 localhost
53 ::1
54 The above list of hosts can be extended at run-time using environment
56 variable SANE_NET_HOSTS. This environment variable is a colon-sepa‐
57 rated list of hostnames or IP addresses that should be contacted in ad‐
58 dition to the hosts mentioned in the configuration file. For example,
59 a user could set the environment variable to the string:
60 new.scanner.com:[::1]:192.168.0.2:scanner.univ.edu
62 To request that hosts new.scanner.com , [::1] , 192.168.0.2 and scan‐
64 ner.univ.edu are contacted in addition to the hosts listed above.
65 For this backend to function properly, it is also necessary to define
67 the sane-port service in /etc/services. The sane service should be de‐
68 fined using a line of the following form:
69 sane-port 6566/tcp # SANE network scanner daemon
71
73 /etc/sane.d/net.conf
74 The backend configuration file (see also description of
75 SANE_CONFIG_DIR below).
76 /usr/lib64/sane/libsane-net.a
78 The static library implementing this backend.
79 /usr/lib64/sane/libsane-net.so
81 The shared library implementing this backend (present on systems
82 that support dynamic loading).
83
85 SANE_CONFIG_DIR
86 This environment variable specifies the list of directories that
87 may contain the configuration file. On *NIX systems, the direc‐
88 tories are separated by a colon (`:'), under OS/2, they are sep‐
89 arated by a semi-colon (`;'). If this variable is not set, the
90 configuration file is searched in two default directories:
91 first, the current working directory (".") and then in
92 /etc/sane.d. If the value of the environment variable ends with
93 the directory separator character, then the default directories
94 are searched after the explicitly specified directories. For
95 example, setting SANE_CONFIG_DIR to "/tmp/config:" would result
96 in directories tmp/config, ., and /etc/sane.d being searched (in
97 this order).
98 SANE_NET_HOSTS
100 A colon-separated list of host names or IP addresses to be con‐
101 tacted by this backend.
102 SANE_NET_TIMEOUT
104 Number of seconds to wait for a response from the saned(8)
105 server for the initial connection request.
106 SANE_DEBUG_NET
108 If the library was compiled with debug support enabled, this en‐
109 vironment variable controls the debug level for this backend.
110 E.g., a value of 128 requests all debug output to be printed.
111 Smaller levels reduce verbosity.
112
114 If saned(8) has timed out, the net backend may loop with authorization
115 requests.
116
119 sane(7), saned(8), sane-dll(5), scanimage(1)
120 http://www.penguin-breeder.org/?page=sane-net
122
124 David Mosberger and Andreas Beck
125 14 Jul 2008 sane-net(5)