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A script for auto-configuring saned network connections

Oct 08, 2010, 21:04 (0 Talkback[s])
(Other stories by jhansonxi)


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"Host-connected image scanners can be shared through saned (part of sane-utils in Ubuntu). It can be run continuously as a daemon or on-demand through Inetd. Basic configuration for either mode is simple and generic but adding the network address to the saned.conf file in CIDR notation is not. When you are setting up systems for multiple clients on different networks and IP ranges, this is a bit of a nuisance. To automate this I wrote saned-subnet-conf which will automatically add an entry for whatever network the host connects to through Network Manager or the ifupdown utilities directly.

"Whenever a network connection is made or broken, scripts can be triggered. These scripts need to be located (or linked to) in "/etc/network" in specific subdirectories, the choice of which determines when they execute. Variables are passed to them that can be used for changing behavior based on the network interface, address assignment mode used (DHCP, static, ppp, etc.), and other values. See the interfaces man page for some hints. Network Manager executes these scripts with "/etc/NetworkManager/dispatcher.d/01ifupdown" which uses the run-parts utility. Network Manager does not trigger the "pre" directories due to a design decision."

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