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/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2016 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "shrpx_dual_dns_resolver.h"
namespace shrpx {
DualDNSResolver::DualDNSResolver(struct ev_loop *loop, int family)
: family_(family), resolv4_(loop), resolv6_(loop) {
auto cb = [this](DNSResolverStatus, const Address *) {
Address result;
auto status = this->get_status(&result);
switch (status) {
case DNSResolverStatus::ERROR:
case DNSResolverStatus::OK:
break;
default:
return;
}
auto cb = this->get_complete_cb();
cb(status, &result);
};
if (family_ == AF_UNSPEC || family_ == AF_INET) {
resolv4_.set_complete_cb(cb);
}
if (family_ == AF_UNSPEC || family_ == AF_INET6) {
resolv6_.set_complete_cb(cb);
}
}
int DualDNSResolver::resolve(const StringRef &host) {
int rv4 = 0, rv6 = 0;
if (family_ == AF_UNSPEC || family_ == AF_INET) {
rv4 = resolv4_.resolve(host, AF_INET);
}
if (family_ == AF_UNSPEC || family_ == AF_INET6) {
rv6 = resolv6_.resolve(host, AF_INET6);
}
if (rv4 != 0 && rv6 != 0) {
return -1;
}
return 0;
}
CompleteCb DualDNSResolver::get_complete_cb() const { return complete_cb_; }
void DualDNSResolver::set_complete_cb(CompleteCb cb) { complete_cb_ = cb; }
DNSResolverStatus DualDNSResolver::get_status(Address *result) const {
auto rv6 = resolv6_.get_status(result);
if (rv6 == DNSResolverStatus::OK) {
return DNSResolverStatus::OK;
}
auto rv4 = resolv4_.get_status(result);
if (rv4 == DNSResolverStatus::OK) {
return DNSResolverStatus::OK;
}
if (rv4 == DNSResolverStatus::RUNNING || rv6 == DNSResolverStatus::RUNNING) {
return DNSResolverStatus::RUNNING;
}
if (rv4 == DNSResolverStatus::ERROR || rv6 == DNSResolverStatus::ERROR) {
return DNSResolverStatus::ERROR;
}
return DNSResolverStatus::IDLE;
}
} // namespace shrpx
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