1 /* Name resolution using adns */
6 #error secnet requires ADNS version 1.0 or above
15 struct resolver_if ops
;
22 resolve_answer_fn
*answer
;
26 static resolve_request_fn resolve_request
;
27 static bool_t
resolve_request(void *sst
, cstring_t name
,
28 resolve_answer_fn
*cb
, void *cst
)
33 const int maxlitlen
=50;
35 ssize_t l
=strlen(name
);
36 if (name
[0]=='[' && l
<maxlitlen
&& l
>2 && name
[l
-1]==']') {
37 char trimmed
[maxlitlen
+1];
38 memcpy(trimmed
,name
+1,l
-2);
41 if (inet_aton(trimmed
,&ia
))
48 q
=safe_malloc(sizeof *q
,"resolve_request");
52 rv
=adns_submit(st
->ast
, name
, adns_r_a
, 0, q
, &q
->query
);
57 static int resolver_beforepoll(void *sst
, struct pollfd
*fds
, int *nfds_io
,
61 return adns_beforepoll(st
->ast
, fds
, nfds_io
, timeout_io
, tv_now
);
64 static void resolver_afterpoll(void *sst
, struct pollfd
*fds
, int nfds
)
73 adns_afterpoll(st
->ast
, fds
, nfds
, tv_now
);
77 rv
=adns_check(st
->ast
, &aq
, &ans
, &qp
);
80 if (ans
->status
!=adns_s_ok
) {
81 q
->answer(q
->cst
,NULL
); /* Failure */
85 q
->answer(q
->cst
,ans
->rrs
.inaddr
);
89 } else if (rv
==EAGAIN
|| rv
==ESRCH
) {
92 fatal("resolver_afterpoll: adns_check() returned %d",rv
);
99 /* Initialise adns, using parameters supplied */
100 static list_t
*adnsresolver_apply(closure_t
*self
, struct cloc loc
,
101 dict_t
*context
, list_t
*args
)
108 st
=safe_malloc(sizeof(*st
),"adnsresolver_apply");
109 st
->cl
.description
="adns";
110 st
->cl
.type
=CL_RESOLVER
;
112 st
->cl
.interface
=&st
->ops
;
115 st
->ops
.request
=resolve_request
;
118 if (!i
|| i
->type
!=t_dict
) {
119 cfgfatal(st
->loc
,"adns","first argument must be a dictionary\n");
122 conf
=dict_read_string(d
,"config",False
,"adns",loc
);
125 if (adns_init_strcfg(&st
->ast
, 0, 0, conf
)) {
126 fatal_perror("Failed to initialise ADNS");
129 if (adns_init(&st
->ast
, 0, 0)) {
130 fatal_perror("Failed to initialise ADNS");
134 register_for_poll(st
, resolver_beforepoll
, resolver_afterpoll
,
135 ADNS_POLLFDS_RECOMMENDED
+5,"resolver");
137 return new_closure(&st
->cl
);
140 void resolver_module(dict_t
*dict
)
142 add_closure(dict
,"adns",adnsresolver_apply
);