res_isourserver(3C)

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

SYNOPSIS
     #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
     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
     resolver(4).