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);
55 socklen_t salen=sizeof(ca.ia);
56 rv=adns_text2addr(trimmed, port, adns_qf_addrlit_ipv4_quadonly,
61 snprintf(msg,sizeof(msg),"invalid address literal: %s",
69 ca.ia.sin.sin_family=AF_INET;
70 ca.ia.sin.sin_port=htons(port);
71 if (inet_aton(trimmed,&ca.ia.sin.sin_addr))
74 cb(cst,0,0,name,"invalid IP address");
79 q=safe_malloc(sizeof *q,"resolve_request");
86 rv=adns_submit(st->ast, name, adns_r_addr, 0, q, &q->query);
89 "resolver: failed to submit lookup for %s: %s",name,
98 static int resolver_beforepoll(void *sst, struct pollfd *fds, int *nfds_io,
102 return adns_beforepoll(st->ast, fds, nfds_io, timeout_io, tv_now);
105 static void resolver_afterpoll(void *sst, struct pollfd *fds, int nfds)
114 adns_afterpoll(st->ast, fds, nfds, tv_now);
118 rv=adns_check(st->ast, &aq, &ans, &qp);
121 if (ans->status!=adns_s_ok) {
122 q->answer(q->cst,NULL,0,q->name,adns_strerror(ans->status));
127 int ca_len=MIN(ans->nrrs,MAX_PEER_ADDRS);
128 struct comm_addr ca_buf[ca_len];
130 for (rslot=0, wslot=0;
131 rslot<ans->nrrs && wslot<ca_len;
133 adns_rr_addr *ra=&ans->rrs.addr[rslot];
134 struct comm_addr *ca=&ca_buf[wslot];
136 /* copy fields individually so we leave holes zeroed: */
137 switch (ra->addr.sa.sa_family) {
139 assert(ra->len == sizeof(ca->ia.sin));
140 ca->ia.sin.sin_family=ra->addr.inet.sin_family;
141 ca->ia.sin.sin_addr= ra->addr.inet.sin_addr;
142 ca->ia.sin.sin_port= htons(q->port);
147 assert(ra->len == sizeof(ca->ia.sin6));
148 ca->ia.sin6.sin6_family=ra->addr.inet6.sin6_family;
149 ca->ia.sin6.sin6_addr= ra->addr.inet6.sin6_addr;
150 ca->ia.sin6.sin6_port= htons(q->port);
153 #endif /*CONFIG_IPV6*/
158 q->answer(q->cst,ca_buf,wslot,q->name,0);
162 } else if (rv==EAGAIN || rv==ESRCH) {
165 fatal("resolver_afterpoll: adns_check() returned %d",rv);
172 /* Initialise adns, using parameters supplied */
173 static list_t *adnsresolver_apply(closure_t *self, struct cloc loc,
174 dict_t *context, list_t *args)
181 st=safe_malloc(sizeof(*st),"adnsresolver_apply");
182 st->cl.description="adns";
183 st->cl.type=CL_RESOLVER;
185 st->cl.interface=&st->ops;
188 st->ops.request=resolve_request;
191 if (!i || i->type!=t_dict) {
192 cfgfatal(st->loc,"adns","first argument must be a dictionary\n");
195 conf=dict_read_string(d,"config",False,"adns",loc);
198 if (adns_init_strcfg(&st->ast, 0, 0, conf)) {
199 fatal_perror("Failed to initialise ADNS");
202 if (adns_init(&st->ast, 0, 0)) {
203 fatal_perror("Failed to initialise ADNS");
207 register_for_poll(st, resolver_beforepoll, resolver_afterpoll,
210 return new_closure(&st->cl);
213 void resolver_module(dict_t *dict)
215 add_closure(dict,"adns",adnsresolver_apply);