dn_find()

The dn_find() call searches for an expanded name from a list of previously compressed names.

Syntax

#include <types.h>
#include <netinet\in.h>
#include <arpa\nameser.h>
#include <resolv.h>
int dn_find(exp_dn, msg, dnptrs, lastdnptr)
u_char *exp_dn;
u_char *msg;
u_char **dnptrs;
u_char **lastdnptr;

Parameters

exp_dn

Pointer to the expanded name to search for.

Pointer to the start of a messag.e

Pointer to the location of the first name on the list to search, not the pointer to the start of the message.

Pointer to the end of the array pointed to by dnptrs.

Description

The dn_find() call is one of a group of calls that form the resolver. The resolver is a set of functions that perform a translation between domain names and network addresses. Global information used by the resolver calls resides in the _res data structure. The <RESOLV.H> file contains the _res data structure definition. (See The _res Data Structure for more on the _res data structure.)

Return Values

When successful, the dn_find() call returns the offset from msg. When unsuccessful, the call returns a value of -1.

Related Calls

dn_comp() dn_expand()
dn_skipname()


• getlong()
  
• getshort()
  putlong()
  putshort()
  res_init()
  res_mkquery()
  res_query()
  res_search()
  res_send()