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Add resolver for hostname -> ip, use it before bind/connect

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This commit is contained in:
Alexey Rybalchenko
2018-05-03 15:00:32 +02:00
committed by Dennis Klein
parent 166e537d9f
commit a5ff7d5a1e
4 changed files with 82 additions and 10 deletions
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55
fairmq/tools/Network.h
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@@ -22,11 +22,13 @@
#include <stdio.h>
#include <boost/algorithm/string.hpp> // trim
#include <boost/asio.hpp>
#include <map>
#include <string>
#include <iostream>
#include <array>
#include <exception>
namespace fair
{
@@ -128,6 +130,59 @@ inline std::string getDefaultRouteNetworkInterface()
return interfaceName;
}
inline std::string getIpFromHostname(const std::string& hostname)
{
try {
boost::asio::io_service ios;
boost::asio::ip::tcp::resolver resolver(ios);
boost::asio::ip::tcp::resolver::query query(hostname, "");
boost::asio::ip::tcp::resolver::iterator end;
auto it = std::find_if(resolver.resolve(query), end, [](const boost::asio::ip::tcp::endpoint& ep) {
return ep.address().is_v4();
});
if (it != end) {
std::stringstream ss;
ss << static_cast<boost::asio::ip::tcp::endpoint>(*it).address();
return ss.str();
}
LOG(warn) << "could not find ipv4 address for hostname '" << hostname << "'";
return "";
} catch (std::exception& e) {
LOG(error) << "could not resolve hostname '" << hostname << "', reason: " << e.what();
return "";
}
}
inline std::string getIpFromHostname(const std::string& hostname, boost::asio::io_service& ios)
{
try {
boost::asio::ip::tcp::resolver resolver(ios);
boost::asio::ip::tcp::resolver::query query(hostname, "");
boost::asio::ip::tcp::resolver::iterator end;
auto it = std::find_if(resolver.resolve(query), end, [](const boost::asio::ip::tcp::endpoint& ep) {
return ep.address().is_v4();
});
if (it != end) {
std::stringstream ss;
ss << static_cast<boost::asio::ip::tcp::endpoint>(*it).address();
return ss.str();
}
LOG(warn) << "could not find ipv4 address for hostname '" << hostname << "'";
return "";
} catch (std::exception& e) {
LOG(error) << "could not resolve hostname '" << hostname << "', reason: " << e.what();
return "";
}
}
} /* namespace tools */
} /* namespace mq */
} /* namespace fair */