res_findzonecut2()--Find the Enclosing Zone and Servers


  Syntax
 #include <sys/types.h>
 #include <netinet/in.h>
 #include <arpa/nameser.h>
 #include <resolv.h>

 int res_findzonecut2(state* res,
                      const char *domain_name,
                      ns_class class,
                      int options,
                      char *zone_name,
                      size_t zone_size,
                      union res_sockaddr_union *addresses,
                      int num_addresses)

  Service Program Name: QSOSRV2

  Default Public Authority: *USE

  Threadsafe: Yes

The res_findzonecut2() function queries name servers until it finds the enclosing zone and its master name servers for the specified domain name.

res_findzonecut2() differs from res_findzonecut() in that res_findzonecut2() can return IPv6 master name server addresses in the res_sockaddr_union, which is defined in <resolv.h>. 
union res_sockaddr_union {
    struct sockaddr_in  sin;
    struct sockaddr_in6 sin6;
    int64_t         __align64;  /* 64bit alignment */
    char            __space[128];   /* max size */
};

The following options are defined for res_findzonecut2() to limit the type of master name server address returned:

#define RES_IPV4ONLY    0x00000002  /* IPv4 only */
#define RES_IPV6ONLY    0x00000004  /* IPv6 only */

For a discussion of the remaining parameters, authorities required, return values, and other related information, see res_findzonecut()--Find the Enclosing Zone and Servers.

Usage Notes

  1. All of the usage notes for res_findzonecut()--Find the Enclosing Zone and Servers apply to res_findzonecut2().


API introduced: V6R1

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