1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
/*
* This file is part of PowerDNS or dnsdist.
* Copyright -- PowerDNS.COM B.V. and its contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In addition, for the avoidance of any doubt, permission is granted to
* link this program with OpenSSL and to (re)distribute the binaries
* produced as the result of such linking.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <vector>
#include "dnsdist-resolver.hh"
#include "iputils.hh"
namespace dnsdist::resolver
{
void asynchronousResolver(const std::string& hostname, const std::function<void(const std::string& hostname, std::vector<ComboAddress>& ips)>& callback)
{
addrinfo hints{};
hints.ai_family = AF_UNSPEC;
hints.ai_flags = AI_ADDRCONFIG;
hints.ai_socktype = SOCK_DGRAM;
addrinfo* infosRaw{nullptr};
std::vector<ComboAddress> addresses;
auto ret = getaddrinfo(hostname.c_str(), nullptr, &hints, &infosRaw);
if (ret != 0) {
callback(hostname, addresses);
return;
}
auto infos = std::unique_ptr<addrinfo, decltype(&freeaddrinfo)>(infosRaw, &freeaddrinfo);
for (const auto* addr = infos.get(); addr != nullptr; addr = addr->ai_next) {
try {
addresses.emplace_back(addr->ai_addr, addr->ai_addrlen);
}
catch (...) {
}
}
callback(hostname, addresses);
}
}
|
