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Temporarily connect socket to get Path MTU

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This commit is contained in:
Keith Winstein
2011-08-13 19:14:14 -04:00
parent d6e7f69a4b
commit f2f0cd574a
1 changed files with 13 additions and 1 deletions
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network.cpp
+13 -1
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@@ -136,6 +136,11 @@ Connection::Connection( const char *key_str, const char *ip, int port ) /* clien
void Connection::update_MTU( void )
{
/* Temporarily connect socket so we can retrieve path MTU */
if ( connect( sock, (sockaddr *)&remote_addr, sizeof( remote_addr ) ) < 0 ) {
throw NetworkException( "connect", errno );
}
socklen_t optlen = sizeof( MTU );
if ( getsockopt( sock, IPPROTO_IP, IP_MTU, &MTU, &optlen ) < 0 ) {
throw NetworkException( "getsockopt", errno );
@@ -145,7 +150,14 @@ void Connection::update_MTU( void )
throw NetworkException( "Error getting path MTU", errno );
}
fprintf( stderr, "Path MTU: %d\n", MTU );
/* Disconnect socket */
struct sockaddr disconnect;
disconnect.sa_family = AF_UNSPEC;
if ( connect( sock, (sockaddr *)&disconnect, sizeof( disconnect ) ) < 0 ) {
throw NetworkException( "connect", errno );
}
}
void Connection::send( string &s, bool send_timestamp )