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| <h4 class="subsection">29.16.1 Netgroup Data</h4> |
| |
| <p><a name="index-Netgroup-3424"></a>Sometimes it is useful to group users according to other criteria |
| (see <a href="Group-Database.html#Group-Database">Group Database</a>). E.g., it is useful to associate a certain |
| group of users with a certain machine. On the other hand grouping of |
| host names is not supported so far. |
| |
| <p>In Sun Microsystems SunOS appeared a new kind of database, the netgroup |
| database. It allows grouping hosts, users, and domains freely, giving |
| them individual names. To be more concrete, a netgroup is a list of triples |
| consisting of a host name, a user name, and a domain name where any of |
| the entries can be a wildcard entry matching all inputs. A last |
| possibility is that names of other netgroups can also be given in the |
| list specifying a netgroup. So one can construct arbitrary hierarchies |
| without loops. |
| |
| <p>Sun's implementation allows netgroups only for the <code>nis</code> or |
| <code>nisplus</code> service, see <a href="Services-in-the-NSS-configuration.html#Services-in-the-NSS-configuration">Services in the NSS configuration</a>. The |
| implementation in the GNU C library has no such restriction. An entry |
| in either of the input services must have the following form: |
| |
| <pre class="smallexample"> <var>groupname</var> ( <var>groupname</var> | <code>(</code><var>hostname</var><code>,</code><var>username</var><code>,</code><code>domainname</code><code>)</code> )+ |
| </pre> |
| <p>Any of the fields in the triple can be empty which means anything |
| matches. While describing the functions we will see that the opposite |
| case is useful as well. I.e., there may be entries which will not |
| match any input. For entries like this, a name consisting of the single |
| character <code>-</code> shall be used. |
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