1 /* Name resolution using adns */
7 #error secnet requires ADNS version 1.0 or above
10 #include <arpa/inet.h>
16 struct resolver_if ops
;
25 resolve_answer_fn
*answer
;
29 static resolve_request_fn resolve_request
;
30 static bool_t
resolve_request(void *sst
, cstring_t name
,
31 int port
, struct comm_if
*comm
,
32 resolve_answer_fn
*cb
, void *cst
)
37 const int maxlitlen
=50;
39 ssize_t l
=strlen(name
);
40 if (name
[0]=='[' && l
<maxlitlen
&& l
>2 && name
[l
-1]==']') {
41 char trimmed
[maxlitlen
+1];
42 memcpy(trimmed
,name
+1,l
-2);
46 ca
.ia
.sin
.sin_family
=AF_INET
;
47 ca
.ia
.sin
.sin_port
=htons(port
);
48 if (inet_aton(trimmed
,&ca
.ia
.sin
.sin_addr
))
55 q
=safe_malloc(sizeof *q
,"resolve_request");
61 rv
=adns_submit(st
->ast
, name
, adns_r_addr
, 0, q
, &q
->query
);
64 "resolver: failed to submit lookup for %s: %s",name
,
73 static int resolver_beforepoll(void *sst
, struct pollfd
*fds
, int *nfds_io
,
77 return adns_beforepoll(st
->ast
, fds
, nfds_io
, timeout_io
, tv_now
);
80 static void resolver_afterpoll(void *sst
, struct pollfd
*fds
, int nfds
)
89 adns_afterpoll(st
->ast
, fds
, nfds
, tv_now
);
93 rv
=adns_check(st
->ast
, &aq
, &ans
, &qp
);
96 if (ans
->status
!=adns_s_ok
) {
97 q
->answer(q
->cst
,NULL
,0,0); /* Failure */
101 int rslot
, wslot
, total
;
102 int ca_len
=MIN(ans
->nrrs
,MAX_PEER_ADDRS
);
103 struct comm_addr ca_buf
[ca_len
];
104 for (rslot
=0, wslot
=0, total
=0;
108 if (!(wslot
<ca_len
)) continue;
109 adns_rr_addr
*ra
=&ans
->rrs
.addr
[rslot
];
110 struct comm_addr
*ca
=&ca_buf
[wslot
];
112 switch (ra
->addr
.sa
.sa_family
) {
114 assert(ra
->len
== sizeof(ca
->ia
.sin
));
117 /* silently skip unexpected AFs from adns */
120 memcpy(&ca
->ia
,&ra
->addr
,ra
->len
);
123 q
->answer(q
->cst
,ca_buf
,wslot
,total
);
127 } else if (rv
==EAGAIN
|| rv
==ESRCH
) {
130 fatal("resolver_afterpoll: adns_check() returned %d",rv
);
137 /* Initialise adns, using parameters supplied */
138 static list_t
*adnsresolver_apply(closure_t
*self
, struct cloc loc
,
139 dict_t
*context
, list_t
*args
)
146 st
=safe_malloc(sizeof(*st
),"adnsresolver_apply");
147 st
->cl
.description
="adns";
148 st
->cl
.type
=CL_RESOLVER
;
150 st
->cl
.interface
=&st
->ops
;
153 st
->ops
.request
=resolve_request
;
156 if (!i
|| i
->type
!=t_dict
) {
157 cfgfatal(st
->loc
,"adns","first argument must be a dictionary\n");
160 conf
=dict_read_string(d
,"config",False
,"adns",loc
);
163 if (adns_init_strcfg(&st
->ast
, 0, 0, conf
)) {
164 fatal_perror("Failed to initialise ADNS");
167 if (adns_init(&st
->ast
, 0, 0)) {
168 fatal_perror("Failed to initialise ADNS");
172 register_for_poll(st
, resolver_beforepoll
, resolver_afterpoll
,
173 ADNS_POLLFDS_RECOMMENDED
+5,"resolver");
175 return new_closure(&st
->cl
);
178 void resolver_module(dict_t
*dict
)
180 add_closure(dict
,"adns",adnsresolver_apply
);