getdns_address(3) getdns getdns_address(3)NAME
getdns_address, getdns_address_sync -- get ip address(es) for a name
LIBRARY
DNS Resolver library (libgetdns, -lgetdns)
SYNOPSIS
#include <getdns.h>
getdns_return_t
getdns_address (getdns_context *context,
const char *name,
getdns_dict *extensions,
void *userarg,
getdns_transaction_t *transaction_id,
getdns_callback_t callbackfn)
getdns_return_t
getdns_address_sync (getdns_context *context,
const char *name,
getdns_dict *extensions,
getdns_dict **response)
DESCRIPTION
The getdns_address(3) and getdns_address_sync functions provide public
entry points into the getdns API library to retrieve the address given
a host name. They always returns both IPv4 and IPv6 addresses. This
function will use all of the namespaces from the context (to better
emulate getaddrinfo (3)).
context A pointer to the previously created DNS context that is to be
used with this DNS request. see getdns_context (3)
name the host name to resolve to an address (note that an IP address is
considered invalid)
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 asyn‐
chronous signature accepts a callback function, the synchronous sig‐
nature 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 con‐
text 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 ALSOlibgetdns(3), getdns_context(3), getdns_free_sync_request_memory(3),
getdns_general(3), getdns_general_sync(3), getdns_hostname(3),
getdns_hostname_sync(3), getdns_service(3), getdns_service_sync(3)getdns 0.9.0 December 2015 getdns_address(3)
