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;
26 resolve_answer_fn *answer;
30 static resolve_request_fn resolve_request;
31 static bool_t resolve_request(void *sst, cstring_t name,
32 int port, struct comm_if *comm,
33 resolve_answer_fn *cb, void *cst)
40 ADNS_ADDR2TEXT_BUFLEN*2
45 ssize_t l=strlen(name);
46 if (name[0]=='[' && l<maxlitlen && l>2 && name[l-1]==']') {
47 char trimmed[maxlitlen+1];
48 memcpy(trimmed,name+1,l-2);
54 socklen_t salen=sizeof(ca.ia);
55 rv=adns_text2addr(trimmed, port, adns_qf_addrlit_ipv4_quadonly,
60 snprintf(msg,sizeof(msg),"invalid address literal: %s",
63 cb(cst,0,0,0,name,msg);
65 cb(cst,&ca,1,1,name,0);
68 ca.ia.sin.sin_family=AF_INET;
69 ca.ia.sin.sin_port=htons(port);
70 if (inet_aton(trimmed,&ca.ia.sin.sin_addr))
71 cb(cst,&ca,1,1,name,0);
73 cb(cst,0,0,0,name,"invalid IP address");
85 rv=adns_submit(st->ast, name, adns_r_addr, 0, q, &q->query);
88 "resolver: failed to submit lookup for %s: %s",name,
97 static int resolver_beforepoll(void *sst, struct pollfd *fds, int *nfds_io,
101 return adns_beforepoll(st->ast, fds, nfds_io, timeout_io, tv_now);
104 static void resolver_afterpoll(void *sst, struct pollfd *fds, int nfds)
113 adns_afterpoll(st->ast, fds, nfds, tv_now);
117 rv=adns_check(st->ast, &aq, &ans, &qp);
120 if (ans->status!=adns_s_ok) {
121 q->answer(q->cst,NULL,0,0,q->name,adns_strerror(ans->status));
125 int rslot, wslot, total;
126 int ca_len=MIN(ans->nrrs,MAX_PEER_ADDRS);
127 struct comm_addr ca_buf[ca_len];
128 for (rslot=0, wslot=0, total=0;
132 if (!(wslot<ca_len)) continue;
133 adns_rr_addr *ra=&ans->rrs.addr[rslot];
134 struct comm_addr *ca=&ca_buf[wslot];
137 assert(ra->len <= (int)sizeof(ca->ia));
138 memcpy(&ca->ia,&ra->addr,ra->len);
139 switch (ra->addr.sa.sa_family) {
141 assert(ra->len == sizeof(ca->ia.sin));
142 ca->ia.sin.sin_port=htons(q->port);
146 assert(ra->len == sizeof(ca->ia.sin6));
147 ca->ia.sin6.sin6_port=htons(q->port);
149 #endif /*CONFIG_IPV6*/
151 /* silently skip unexpected AFs from adns */
156 q->answer(q->cst,ca_buf,wslot,total,q->name,0);
160 } else if (rv==EAGAIN || rv==ESRCH) {
163 fatal("resolver_afterpoll: adns_check() returned %d",rv);
170 /* Initialise adns, using parameters supplied */
171 static list_t *adnsresolver_apply(closure_t *self, struct cloc loc,
172 dict_t *context, list_t *args)
180 st->cl.description="adns";
181 st->cl.type=CL_RESOLVER;
183 st->cl.interface=&st->ops;
186 st->ops.request=resolve_request;
189 if (!i || i->type!=t_dict) {
190 cfgfatal(st->loc,"adns","first argument must be a dictionary\n");
193 conf=dict_read_string(d,"config",False,"adns",loc);
196 if (adns_init_strcfg(&st->ast, 0, 0, conf)) {
197 fatal_perror("Failed to initialise ADNS");
200 if (adns_init(&st->ast, 0, 0)) {
201 fatal_perror("Failed to initialise ADNS");
205 register_for_poll(st, resolver_beforepoll, resolver_afterpoll,
208 return new_closure(&st->cl);
211 void resolver_module(dict_t *dict)
213 add_closure(dict,"adns",adnsresolver_apply);