RES_HNOK(3C)							  RES_HNOK(3C)

NAME    [Toc]    [Back]

     res_hnok, res_ownok, res_mailok, res_dnok - name service record validity
     routines

SYNOPSIS    [Toc]    [Back]

     #include <resolv.h>

     int res_hnok(char *dn);

     int res_ownok(char	*dn);

     int res_mailok(char *dn);

     int res_dnok(char *dn);

DESCRIPTION    [Toc]    [Back]

     Helper functions that determine the validity of a few types of nameservice
 related records.  Functions return	1 for valid, 0 for invalid.

     res_hnok determines if the	given argument is a valid hostname.  res_ownok
     is	similar, but allows for	"*" in the first label.	 For example:
     *.sgi.com.	 This is appropriate for A or MX record	owners.	 res_mailok
     allows for	any printable characters in the	first label.  The rest of the
     name must look like a valid hostname.  Useful for SOA RNAMEs and RP
     RNAMEs.  Finally, res_dnok	follows	RFC 1034 for valid domain name
     characters.

FILES    [Toc]    [Back]

     /etc/resolv.conf

SEE ALSO    [Toc]    [Back]

     resolver(4), named(1M).


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