RES_ISOURSERVER(3C)					   RES_ISOURSERVER(3C)

NAME    [Toc]    [Back]

     res_isourserver, res_nameinquery, res_queriesmatch, res_querydomain,
     res_randomid - resolver query utilities

SYNOPSIS    [Toc]    [Back]

     #include <resolv.h>

     int res_isourserver(struct	sockaddr_in *inp);

     int res_nameinquery(char *name, int type, int class, u_char *buf, u_char *eom);

     int res_queriesmatch(u_char *buf1,	u_char *eom1, u_char *buf2, u_char *eom2);

     int res_querydomain(char *name, char *domain, int class, int type,	u_char *answer,	int anslen);

     u_int16_t res_randomid(void);

DESCRIPTION    [Toc]    [Back]

     Helper functions for resolver code	development.

     res_isourserver returns 1 if argument appears in current list of the
     clients name servers, returns 0 if	not.  res_nameinquery looks for	(name,
     type, class) in the query section of packet (buf, eom).  Returns: -1
     format error, 0 not found,	or >0 found.

     res_queriesmatch looks for	a 1:1 mapping of (name,	type, class) in
     packets (buf1, eom1) and (buf2, eom2).  Returns: -1 format	error, 0 not a
     1:1 mapping, and >0 is a 1:1 mapping.  res_querydomain performs a call to
     res_query (see res_query(3) ) on the concatenation	of name	and domain.

     res_randomid is a pseudo-random number generator.

SEE ALSO    [Toc]    [Back]

     resolver(4).


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