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get local MTU for Linux

pull/108/head
orignal 10 years ago
parent
commit
a314feff33
  1. 63
      util.cpp
  2. 6
      util.h

63
util.cpp

@ -15,6 +15,11 @@ @@ -15,6 +15,11 @@
#include "util.h"
#include "Log.h"
#if defined(__linux__) || defined(__FreeBSD_kernel__)
#include <sys/types.h>
#include <ifaddrs.h>
#endif
#ifdef WIN32
#include <Windows.h>
#include <shlobj.h>
@ -390,9 +395,63 @@ namespace http @@ -390,9 +395,63 @@ namespace http
}
}
} // Namespace end
namespace net
{
int GetMTU (const boost::asio::ip::address& localAddress)
{
#if defined(__linux__) || defined(__FreeBSD_kernel__)
ifaddrs * ifaddr, * ifa = nullptr;
if (getifaddrs(&ifaddr) == -1)
{
LogPrint (eLogError, "Can't excute getifaddrs");
return 0;
}
int family = 0;
// loook for interface matching local address
for (ifa = ifaddr; ifa != nullptr; ifa = ifa->ifa_next)
{
family = ifa->ifa_addr->sa_family;
if (family == AF_INET && localAddress.is_v4 ())
{
sockaddr_in * sa = (sockaddr_in *)ifa->ifa_addr;
if (!memcmp (&sa->sin_addr, localAddress.to_v4 ().to_bytes ().data (), 4))
break; // address matches
}
else if (family == AF_INET6 && localAddress.is_v6 ())
{
sockaddr_in6 * sa = (sockaddr_in6 *)ifa->ifa_addr;
if (!memcmp (&sa->sin6_addr, localAddress.to_v6 ().to_bytes ().data (), 16))
break; // address matches
}
}
int mtu = 0;
if (ifa && family) // interface found?
{
int fd = socket (family, SOCK_DGRAM, 0);
if (fd > 0)
{
ifreq ifr;
strncpy (ifr.ifr_name, ifa->ifa_name, IFNAMSIZ); // set interface for query
if (ioctl (fd, SIOCGIFMTU, &ifr) >= 0)
mtu = ifr.ifr_mtu; // MTU
else
LogPrint (eLogError, "Failed to run ioctl");
close (fd);
}
else
LogPrint (eLogError, "Failed to create datagram socket");
}
else
LogPrint (eLogWarning, "Interface for local address", localAddress.to_string (), " not found");
freeifaddrs (ifaddr);
return mtu;
#else
return 0;
#endif
}
} // namespace end
} // Namespace end
}

6
util.h

@ -3,6 +3,7 @@ @@ -3,6 +3,7 @@
#include <map>
#include <string>
#include <boost/asio.hpp>
#include <boost/filesystem.hpp>
#include <boost/filesystem/fstream.hpp>
@ -49,6 +50,11 @@ namespace util @@ -49,6 +50,11 @@ namespace util
std::string pass_;
};
}
namespace net
{
int GetMTU (const boost::asio::ip::address& localAddress);
}
}
}

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