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)
39 ADNS_ADDR2TEXT_BUFLEN*2
44 ssize_t l=strlen(name);
45 if (name[0]=='[' && l<maxlitlen && l>2 && name[l-1]==']') {
46 char trimmed[maxlitlen+1];
47 memcpy(trimmed,name+1,l-2);
53 socklen_t salen=sizeof(ca.ia);
54 rv=adns_text2addr(trimmed, port, adns_qf_addrlit_ipv4_quadonly,
59 snprintf(msg,sizeof(msg),"invalid address literal: %s",
67 ca.ia.sin.sin_family=AF_INET;
68 ca.ia.sin.sin_port=htons(port);
69 if (inet_aton(trimmed,&ca.ia.sin.sin_addr))
72 cb(cst,0,0,0,"invalid IP address");
77 q=safe_malloc(sizeof *q,"resolve_request");
83 rv=adns_submit(st->ast, name, adns_r_addr, 0, q, &q->query);
86 "resolver: failed to submit lookup for %s: %s",name,
95 static int resolver_beforepoll(void *sst, struct pollfd *fds, int *nfds_io,
99 return adns_beforepoll(st->ast, fds, nfds_io, timeout_io, tv_now);
102 static void resolver_afterpoll(void *sst, struct pollfd *fds, int nfds)
111 adns_afterpoll(st->ast, fds, nfds, tv_now);
115 rv=adns_check(st->ast, &aq, &ans, &qp);
118 if (ans->status!=adns_s_ok) {
119 q->answer(q->cst,NULL,0,0,adns_strerror(ans->status));
123 int rslot, wslot, total;
124 int ca_len=MIN(ans->nrrs,MAX_PEER_ADDRS);
125 struct comm_addr ca_buf[ca_len];
126 for (rslot=0, wslot=0, total=0;
130 if (!(wslot<ca_len)) continue;
131 adns_rr_addr *ra=&ans->rrs.addr[rslot];
132 struct comm_addr *ca=&ca_buf[wslot];
135 switch (ra->addr.sa.sa_family) {
137 assert(ra->len == sizeof(ca->ia.sin));
141 assert(ra->len == sizeof(ca->ia.sin6));
143 #endif /*CONFIG_IPV6*/
145 /* silently skip unexpected AFs from adns */
148 memcpy(&ca->ia,&ra->addr,ra->len);
151 q->answer(q->cst,ca_buf,wslot,total,0);
155 } else if (rv==EAGAIN || rv==ESRCH) {
158 fatal("resolver_afterpoll: adns_check() returned %d",rv);
165 /* Initialise adns, using parameters supplied */
166 static list_t *adnsresolver_apply(closure_t *self, struct cloc loc,
167 dict_t *context, list_t *args)
174 st=safe_malloc(sizeof(*st),"adnsresolver_apply");
175 st->cl.description="adns";
176 st->cl.type=CL_RESOLVER;
178 st->cl.interface=&st->ops;
181 st->ops.request=resolve_request;
184 if (!i || i->type!=t_dict) {
185 cfgfatal(st->loc,"adns","first argument must be a dictionary\n");
188 conf=dict_read_string(d,"config",False,"adns",loc);
191 if (adns_init_strcfg(&st->ast, 0, 0, conf)) {
192 fatal_perror("Failed to initialise ADNS");
195 if (adns_init(&st->ast, 0, 0)) {
196 fatal_perror("Failed to initialise ADNS");
200 register_for_poll(st, resolver_beforepoll, resolver_afterpoll,
201 ADNS_POLLFDS_RECOMMENDED+5,"resolver");
203 return new_closure(&st->cl);
206 void resolver_module(dict_t *dict)
208 add_closure(dict,"adns",adnsresolver_apply);