1
2getdns_hostname(3)                  getdns                  getdns_hostname(3)
3
4
5

NAME

7       getdns_hostname, getdns_hostname_sync -- get hostname by address
8
9

LIBRARY

11       DNS Resolver library (libgetdns, -lgetdns)
12
13

SYNOPSIS

15       #include <getdns.h>
16
17       getdns_return_t
18       getdns_hostname (getdns_context *context,
19          getdns_dict *address,
20          getdns_dict *extensions,
21          void *userarg,
22          getdns_transaction_t *transaction_id,
23          getdns_callback_t callbackfn)
24
25       getdns_return_t
26       getdns_hostname_sync (getdns_context *context,
27          getdns_dict *address,
28          getdns_dict *extensions,
29          getdns_dict **response)
30
31

DESCRIPTION

33       The  getdns_hostname(3) and getdns_hostname_sync functions provide pub‐
34       lic entry points into the getdns API library to retrieve the host  name
35       given an address.
36
37
38       context  A  pointer to the previously created DNS context that is to be
39          used with this DNS request. see getdns_context (3)
40
41
42       address a getdns_dict  structure  containing  two  names:  address_type
43          (whose  value  is  bindata  and  is either "IPv4" or "IPv6") and ad‐
44          dress_data whose value is bindata
45
46
47       extensions extensions for this request,  NULL  if  no  extensions,  see
48          libgetdns (3) for a detailed description of extensions
49
50
51       userarg returned to the callback function untouched, can be NULL
52
53
54       transaction_id  populated  by the API and used to identify the callback
55          (for example to getdns_cancel_callback), can be NULL, set  to  0  if
56          the function fails
57
58
59       callbackfn  non-NULL  pointer to a callback function defined by the ap‐
60          plication, typically used to process the response.  Only  the  asyn‐
61          chronous signature accepts a callback function, the synchronous sig‐
62          nature does not include a callback.  See libgetdns (3)  for  a  more
63          detailed discussion of callback functions.
64
65
66       response A getdns_dict type is returned in response and always contains
67          at least three names: replies_full (a list containing  the  DNS  re‐
68          sponse  as  binary data), replies_tree (a list containing the parsed
69          DNS response data) and status (an int).  The storage associated with
70          this must be freed by a call to getdns_free_sync_request_memory (3).
71
72
73
74

RETURN VALUES

76       Upon  successful  completion  the functions return GETDNS_RETURN_GOOD ,
77       otherwise the following error values are returned:
78
79
80       GETDNS_RETURN_BAD_CONTEXT if the context pointer is invalid or the con‐
81       text has internal deficiencies
82
83       GETDNS_RETURN_BAD_DOMAIN_NAME if the domain name passed to the function
84       is invalid
85
86       GETDNS_RETURN_EXTENSION_MISFORMAT if the data type specified in one  or
87       more of the extensions does not match the specifications
88
89       GETDNS_RETURN_GENERIC_ERROR  if  some  problem  was  encountered in the
90       function not addressed by one of the more specific return codes
91
92       GETDNS_RETURN_INVALID PARAMETER if one or more parameters  has  an  in‐
93       valid value
94
95       GETDNS_RETURN_MEMORY_ERROR if unable to allocate the memory required
96
97       GETDNS_RETURN_NO_SUCH_EXTENSION if one or more of the strings specified
98       in the extensions are not valid
99
100       The values of status included in the response parameter are:
101
102
103       GETDNS_RESPSTATUS_GOOD if at least one response was returned
104
105       GETDNS_RESPSTATUS_NO_NAME if queries for the name yielded all  negative
106       responses
107
108       GETDNS_RESPSTATUS_ALL_TIMEOUT if all queries for the name timed out
109
110       GETDNS_RESPSTATUS_NO_SECURE_ANSWERS  if  only  secure  replies accepted
111       (per context) and at least one response was received  but  no  DNS  re‐
112       sponses were secure through DNSSEC
113
114
115       For  a  more  detailed explanation of the response object see libgetdns
116       (3)
117
118

EXAMPLES

120       TBD
121
122

FILES

124       /etc/hosts
125       /etc/resolv.conf
126
127

SEE ALSO

129       libgetdns(3),  getdns_context(3),   getdns_free_sync_request_memory(3),
130       getdns_general(3), getdns_address(3), getdns_service(3),
131
132
133
134
135getdns 1.7.3                     December 2015              getdns_hostname(3)
Impressum