// $Id$
//
// Copyright (C) 2006
-// Fraunhofer Institute for Open Communication Systems (FOKUS)
-// Competence Center NETwork research (NET), St. Augustin, GERMANY
+// Fraunhofer Institute for Open Communication Systems (FOKUS)
+// Competence Center NETwork research (NET), St. Augustin, GERMANY
// Stefan Bund <g0dil@berlios.de>
//
// This program is free software; you can redistribute it and/or modify
#include "UDPPacket.hh"
//#include "UDPPacket.ih"
-#include "IPv4Packet.hh"
// Custom includes
#include <iomanip>
const
{
IpChecksum summer;
- summer.feed( i(), i()+checksum_offset );
- summer.feed( i()+checksum_offset+2, data().end() );
-
- // Now on to the awkward part: the IP pseudo header
- IPv4Packet ipv4 (packet().rfind<IPv4Packet>());
+ // first on to the awkward part: the IP pseudo header
+ IPv4Packet ipv4 (packet().rfind<IPv4Packet>(nothrow));
if (ipv4) {
// Pseudo header defined in RFC768
summer.feed( ipv4->source().i(),
}
else {
// Pseudo header defined in RFC2460
- IPv6Packet ipv6 (packet().rfind<IPv6Packet>());
+ IPv6Packet ipv6 (packet().rfind<IPv6Packet>(nothrow));
if (ipv6) {
summer.feed( ipv6->source().i(),
ipv6->source().i() + IPv6Packet::Parser::source_t::fixed_bytes );
// The destination used here must be the *final* destination ...
summer.feed( ipv6->destination().i(),
ipv6->destination().i() + IPv6PacketParser::destination_t::fixed_bytes );
- /// This is a simplification. The value is really 32bit to support UDP Jumbograms
- /// (RFC2147). However, skipping an even number of 0 bytes does not change the checksum
+ // This is a simplification. The value is really 32bit to support UDP Jumbograms
+ // (RFC2147). However, skipping an even number of 0 bytes does not change the checksum
summer.feed( i() + length_offset, i() + length_offset + 2 );
// RFC2460 specifies, that this must always be 17, not the value used in the ipv6
// header
}
}
+ // since header are 16 / even 32bit aligned we don't have to care for padding. since IpChecksum
+ // cares for padding at the final summing we don't have to care is the payload is 16nbit-aligned, too.
+ summer.feed( i(), i()+checksum_offset );
+ summer.feed( i()+checksum_offset+2, data().end() );
+
boost::uint16_t rv (summer.sum());
return rv ? rv : 0xffffu;
}
{
boost::io::ios_all_saver ias(os);
os << "UDP:\n"
- << " source port : " << p->source() << "\n"
- << " dest port : " << p->destination() << "\n"
- << " length : " << p->length() << "\n"
- << " checksum : "
- << std::hex << std::setw(4) << std::setfill('0') << p->checksum() << "\n";
+ << " source port : " << p->source() << "\n"
+ << " dest port : " << p->destination() << "\n"
+ << " length : " << p->length() << "\n"
+ << " checksum : "
+ << std::hex << std::setw(4) << std::setfill('0') << p->checksum() << "\n";
}
prefix_ void senf::UDPPacketType::finalize(packet p)