Date: Fri, 5 Mar 2004 11:45:24 +0300 (MSK) From: Michael Bushkov <bushman@stinger.cc.rsu.ru> To: hackers@freebsd.org, arch@freebsd.org Cc: os@rsu.ru Subject: IPC nsswitch implementation Message-ID: <20040305114316.K19883@stinger.cc.rsu.ru>
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Hello! Some time ago there was a discussion concerning in-process vs. IPC nsswitch implementation. We agreed that we should develop an example of IPC implementation and ask for a discussion. We are glad to present you sample implementation of the IPC nsswitch model. http://rsu.ru/~bushman/lookupd-0.1.1.tar.gz It currently has many limitations but should be suitable for demonstration of our approach. There is a daemon and client part in this project. After executing make in "daemon" folder you'll get: 1) lookupd daemon - it should be run by root. And (!) you should be in the lookupd folder - daemon will search for it's modules in ./modules. 2) nsswrapper/nss_lookupd.so - a plug-in for current nsswitch implementation. It should be placed as nss_lookupd.so.1 in /usr/local/lib. lookupd.conf is the daemon configuration file. It has the same syntax as nsswitch.conf. It should be placed in /etc. Examples of lookupd.conf and nsswitch.conf (needed to use lookupd) are in the archive. Daemon uses shared modules (dns, files and so on). Currently following function can use lookupd: - passwd functions - files module - group function - files module - gethostby* functions - files and dns module. We took the code for dns modules from current libc. So it's not thread safe and can be buggy, because daemon is multi-threaded. It was made just to show module-structure capabilities. Later, we'll make normal reentrant resolver. When daemon is running, it sends a lot of info to stdout. It's the way to make you able to know, that it works. There is currently no caching functions in daemon. But it's quite easy to add them - and it will be done in the nearest future. We want you to look at this lookupd. It would be great for us to know if you like or not the way we made it. And we also want to know if this project can be added to FreeBSD project. Please keep CC line of the message, so that all of our developers could read your replies. Michael Bushkov Software Engineer, Rostov State University
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