int
ecore_con_info_init(void)
{
int err;
if (_ecore_con_dns_init) return ++_ecore_con_dns_init;
resconf = dns_resconf_local(&err);
if (!resconf)
{
ERR("resconf_open: %s", dns_strerror(err));
return 0;
}
hosts = dns_hosts_local(&err);
if (!hosts)
{
ERR("hosts_open: %s", dns_strerror(err));
dns_resconf_close(resconf);
resconf = NULL;
return 0;
}
/* this is super slow don't do it */
//resconf->options.recurse = 1;
return ++_ecore_con_dns_init;
}
ipaddr mill_ipremote_(const char *name, int port, int mode, int64_t deadline) {
int rc;
ipaddr addr = mill_ipliteral(name, port, mode);
if(errno == 0)
return addr;
/* Load DNS config files, unless they are already chached. */
if(mill_slow(!mill_dns_conf)) {
/* TODO: Maybe re-read the configuration once in a while? */
mill_dns_conf = dns_resconf_local(&rc);
mill_assert(mill_dns_conf);
mill_dns_hosts = dns_hosts_local(&rc);
mill_assert(mill_dns_hosts);
mill_dns_hints = dns_hints_local(mill_dns_conf, &rc);
mill_assert(mill_dns_hints);
}
/* Let's do asynchronous DNS query here. */
struct dns_resolver *resolver = dns_res_open(mill_dns_conf, mill_dns_hosts,
mill_dns_hints, NULL, dns_opts(), &rc);
mill_assert(resolver);
mill_assert(port >= 0 && port <= 0xffff);
char portstr[8];
snprintf(portstr, sizeof(portstr), "%d", port);
struct addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
struct dns_addrinfo *ai = dns_ai_open(name, portstr, DNS_T_A, &hints,
resolver, &rc);
mill_assert(ai);
dns_res_close(resolver);
struct addrinfo *ipv4 = NULL;
struct addrinfo *ipv6 = NULL;
struct addrinfo *it = NULL;
while(1) {
rc = dns_ai_nextent(&it, ai);
if(rc == EAGAIN) {
int fd = dns_ai_pollfd(ai);
mill_assert(fd >= 0);
int events = fdwait(fd, FDW_IN, deadline);
/* There's no guarantee that the file descriptor will be reused
in next iteration. We have to clean the fdwait cache here
to be on the safe side. */
fdclean(fd);
if(mill_slow(!events)) {
errno = ETIMEDOUT;
return addr;
}
mill_assert(events == FDW_IN);
continue;
}
if(rc == ENOENT)
break;
if(!ipv4 && it && it->ai_family == AF_INET) {
ipv4 = it;
}
else if(!ipv6 && it && it->ai_family == AF_INET6) {
ipv6 = it;
}
else {
free(it);
}
if(ipv4 && ipv6)
break;
}
switch(mode) {
case IPADDR_IPV4:
if(ipv6) {
free(ipv6);
ipv6 = NULL;
}
break;
case IPADDR_IPV6:
if(ipv4) {
free(ipv4);
ipv4 = NULL;
}
break;
case 0:
case IPADDR_PREF_IPV4:
if(ipv4 && ipv6) {
free(ipv6);
ipv6 = NULL;
}
break;
case IPADDR_PREF_IPV6:
if(ipv6 && ipv4) {
free(ipv4);
ipv4 = NULL;
}
break;
default:
mill_assert(0);
}
if(ipv4) {
struct sockaddr_in *inaddr = (struct sockaddr_in*)&addr;
memcpy(inaddr, ipv4->ai_addr, sizeof (struct sockaddr_in));
inaddr->sin_port = htons(port);
dns_ai_close(ai);
free(ipv4);
errno = 0;
return addr;
}
if(ipv6) {
struct sockaddr_in6 *inaddr = (struct sockaddr_in6*)&addr;
memcpy(inaddr, ipv6->ai_addr, sizeof (struct sockaddr_in6));
inaddr->sin6_port = htons(port);
dns_ai_close(ai);
free(ipv6);
errno = 0;
return addr;
}
dns_ai_close(ai);
((struct sockaddr*)&addr)->sa_family = AF_UNSPEC;
errno = EADDRNOTAVAIL;
return addr;
}