NAME

       getdns_hostname, getdns_hostname_sync -- get hostname by address

LIBRARY

       DNS Resolver library (libgetdns, -lgetdns)

SYNOPSIS

       #include <getdns.h>

       getdns_return_t
       getdns_hostname (getdns_context *context,
          getdns_dict *address,
          getdns_dict *extensions,
          void *userarg,
          getdns_transaction_t *transaction_id,
          getdns_callback_t callbackfn)

       getdns_return_t
       getdns_hostname_sync (getdns_context *context,
          getdns_dict *address,
          getdns_dict *extensions,
          getdns_dict **response)

DESCRIPTION

       The getdns_hostname(3) and getdns_hostname_sync functions provide public entry points into
       the getdns API library to retrieve the host name given an address.

       context A pointer to the previously created DNS context that is to be used with  this  DNS
          request. see getdns_context (3)

       address a getdns_dict structure containing two names: address_type (whose value is bindata
          and is either "IPv4" or "IPv6") and address_data whose value is bindata

       extensions extensions for this request, NULL if no extensions, see  libgetdns  (3)  for  a
          detailed description of extensions

       userarg returned to the callback function untouched, can be NULL

       transaction_id  populated  by  the  API  and used to identify the callback (for example to
          getdns_cancel_callback), can be NULL, set to 0 if the function fails

       callbackfn non-NULL pointer to a callback function defined by the  application,  typically
          used  to  process  the  response.  Only  the  asynchronous signature accepts a callback
          function, the synchronous signature does not include a callback.  See libgetdns (3) for
          a more detailed discussion of callback functions.

       response  A  getdns_dict  type  is returned in response and always contains at least three
          names: replies_full (a list containing the DNS response as binary  data),  replies_tree
          (a  list  containing  the  parsed  DNS response data) and status (an int).  The storage
          associated with this must be freed by a call to getdns_free_sync_request_memory (3).

RETURN VALUES

       Upon successful  completion  the  functions  return  GETDNS_RETURN_GOOD  ,  otherwise  the
       following error values are returned:

       GETDNS_RETURN_BAD_CONTEXT  if  the  context pointer is invalid or the context has internal
       deficiencies

       GETDNS_RETURN_BAD_DOMAIN_NAME if the domain name passed to the function is invalid

       GETDNS_RETURN_EXTENSION_MISFORMAT if the data  type  specified  in  one  or  more  of  the
       extensions does not match the specifications

       GETDNS_RETURN_GENERIC_ERROR  if some problem was encountered in the function not addressed
       by one of the more specific return codes

       GETDNS_RETURN_INVALID PARAMETER if one or more parameters has an invalid value

       GETDNS_RETURN_MEMORY_ERROR if unable to allocate the memory required

       GETDNS_RETURN_NO_SUCH_EXTENSION if one or more of the strings specified in the  extensions
       are not valid

       The values of status included in the response parameter are:

       GETDNS_RESPSTATUS_GOOD if at least one response was returned

       GETDNS_RESPSTATUS_NO_NAME if queries for the name yielded all negative responses

       GETDNS_RESPSTATUS_ALL_TIMEOUT if all queries for the name timed out

       GETDNS_RESPSTATUS_NO_SECURE_ANSWERS  if  only secure replies accepted (per context) and at
       least one response was received but no DNS responses were secure through DNSSEC

       For a more detailed explanation of the response object see libgetdns (3)

EXAMPLES

       TBD

FILES

       /etc/hosts
       /etc/resolv.conf

SEE ALSO

       libgetdns(3),  getdns_context(3),  getdns_free_sync_request_memory(3),  getdns_general(3),
       getdns_address(3), getdns_service(3),