NSS Basics

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The basic idea is to put the implementation of the different services offered to access the databases in separate modules. This has some advantages:

1. Contributors can add new services without adding them to GNU C Library.

2. The modules can be updated separately.

3. The C library image is smaller.

To fulfill the first goal above the ABI of the modules will be described below. For getting the implementation of a new service right it is important to understand how the functions in the modules get called. They are in no way designed to be used by the programmer directly. Instead the programmer should only use the documented and standardized functions to access the databases.

The databases available in the NSS are

aliases

Mail aliases

ethers

Ethernet numbers,

group

Groups of users, Group Database.

hosts

Host names and numbers, Host Names.

netgroup

Network wide list of host and users, Netgroup Database.

networks

Network names and numbers, Networks Database.

protocols

Network protocols, Protocols Database.

passwd

User passwords, User Database.

rpc

Remote procedure call names and numbers,

services

Network services, Services Database.

shadow

Shadow user passwords,

There will be some more added later (automount, bootparams, netmasks, and publickey).