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get default network interface from the default route

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This commit is contained in:
Alexey Rybalchenko
2017-03-01 11:25:42 +01:00
committed by Mohammad Al-Turany
parent eaa220e39e
commit 91b7a72ac5
3 changed files with 58 additions and 5 deletions
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50
fairmq/tools/FairMQTools.h
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@@ -5,16 +5,21 @@
#define _GNU_SOURCE // To get defns of NI_MAXSERV and NI_MAXHOST
#endif
#include "FairMQLogger.h"
#include <sys/socket.h>
#include <sys/types.h>
#include <netdb.h>
#include <ifaddrs.h>
#include <stdio.h>
#include <boost/algorithm/string.hpp> // trim
#include <map>
#include <string>
#include <iostream>
#include <type_traits>
#include <array>
using namespace std;
@@ -23,12 +28,14 @@ namespace FairMQ
namespace tools
{
// make_unique implementation, until C++14 is default
template<typename T, typename ...Args>
unique_ptr<T> make_unique(Args&& ...args)
{
return unique_ptr<T>(new T(forward<Args>(args)...));
}
// returns a map with network interface names as keys and their IP addresses as values
int getHostIPs(map<string, string>& addressMap)
{
struct ifaddrs *ifaddr, *ifa;
@@ -65,6 +72,7 @@ int getHostIPs(map<string, string>& addressMap)
return 0;
}
// get IP address of a given interface name
string getInterfaceIP(string interface)
{
map<string, string> IPs;
@@ -76,10 +84,50 @@ string getInterfaceIP(string interface)
else
{
LOG(ERROR) << "Could not find provided network interface: \"" << interface << "\"!, exiting.";
exit(EXIT_FAILURE);
return "";
}
}
// get name of the default route interface
string getDefaultRouteNetworkInterface()
{
array<char, 128> buffer;
string interfaceName;
#ifdef __APPLE__ // MacOS
unique_ptr<FILE, decltype(pclose) *> file(popen("route -n get default | grep interface | cut -d \":\" -f 2", "r"), pclose);
#else // Linux
unique_ptr<FILE, decltype(pclose) *> file(popen("ip route | grep default | cut -d \" \" -f 5", "r"), pclose);
#endif
if (!file)
{
LOG(ERROR) << "Could not detect default route network interface name - popen() failed!";
return "";
}
while (!feof(file.get()))
{
if (fgets(buffer.data(), 128, file.get()) != NULL)
{
interfaceName += buffer.data();
}
}
boost::algorithm::trim(interfaceName);
if (interfaceName == "")
{
LOG(ERROR) << "Could not detect default route network interface name";
}
else
{
LOG(DEBUG) << "Detected network interface name for the default route: " << interfaceName;
}
return interfaceName;
}
#if defined(__GNUC__) || defined(__GNUG__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Weffc++"