INet6Address.cc

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//
// Copyright (c) 2020 Fraunhofer Institute for Applied Information Technology (FIT)
//                    Network Research Group (NET)
//                    Schloss Birlinghoven, 53754 Sankt Augustin, GERMANY
//                    Contact: support@wiback.org
//
// This file is part of the SENF code tree.
// It is licensed under the 3-clause BSD License (aka New BSD License).
// See LICENSE.txt in the top level directory for details or visit
// https://opensource.org/licenses/BSD-3-Clause
//


#include "INet6Address.hh"
#include "INet6Address.ih"

// Custom includes
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <boost/lexical_cast.hpp>
#include <senf/Socket/Protocols/AddressExceptions.hh>
#include <senf/Socket/Protocols/Raw/MACAddress.hh>
#include <senf/Socket/Protocols/Raw/EUI64.hh>

//#include "INet6Address.mpp"
#define prefix_
//-/////////////////////////////////////////////////////////////////////////////////////////////////

//-/////////////////////////////////////////////////////////////////////////////////////////////////
// senf::INet6Address

prefix_ senf::INet6Address senf::INet6Address::from_string(std::string const & s,
                                                           Resolve_t resolve)
{
    struct in6_addr ina;
    if (::inet_pton(AF_INET6,s.c_str(),&ina) > 0)
        return INet6Address::from_data(&ina.s6_addr[0]);

    if (s.empty())
        throw AddressSyntaxException() << ": empty string";


    // If available, we use the reentrant GNU variant. This has the additional advantage, that we
    // can explicitly ask for IPv4 addresses

#   ifdef __GLIBC__

    struct hostent entbuf;
    char buffer[4096];
    struct hostent * ent (0);
    int herr (0);
    ::gethostbyname2_r(s.c_str(), AF_INET6, &entbuf, buffer, sizeof(buffer), &ent, &herr);

#   else // ! __GLIBC__

#   ifdef _REENTRANT
    static boost::mutex mutex;
    boost::mutex::scoped_lock lock(mutex);
#   endif
    struct hostent * ent (::gethostbyname(s.c_str()));

#   endif // __GLIBC__

    if (ent && ent->h_addrtype == AF_INET6)
        // We are only interested in the first address ...
        return INet6Address::from_data(
            &reinterpret_cast<in6_addr*>(*(ent->h_addr_list))->s6_addr[0]);

    if (resolve == ResolveINet4)
        return from_inet4address(INet4Address::from_string(s));
    else
        throw UnknownHostnameException(s);
}

prefix_ in6_addr senf:: INet6Address::toin6_addr() const {
    ::in6_addr ina;
    std::copy((*this).begin(), (*this).end(), &ina.s6_addr[0]);
    return ina;
}

prefix_ senf::INet6Address senf::INet6Address::from_mac(MACAddress const & mac)
{
    INet6Address addr;
    addr[0] = 0xfe;
    addr[1] = 0x80;
    addr[8] = mac[0] ^ 0x2;  // invert the "u" (universal/local) bit; see RFC 4291 Appx. A
    addr[9] = mac[1];
    addr[10] = mac[2];
    addr[11] = 0xff;
    addr[12] = 0xfe;
    addr[13] = mac[3];
    addr[14] = mac[4];
    addr[15] = mac[5];
    return addr;
}

prefix_ senf::INet6Address senf::INet6Address::from_eui64(EUI64 const & eui)
{
    INet6Address addr;
    addr[0] = 0xfe;
    addr[1] = 0x80;
    addr[8] = eui[0] ^ 0x2;  // invert the "u" (universal/local) bit; see RFC 4291 Appx. A
    std::copy(eui.begin()+1, eui.end(), addr.begin()+9);
    return addr;
}

prefix_ senf::EUI64 senf::INet6Address::id()
    const
{
    return EUI64::from_data(begin()+8);
}

prefix_ std::ostream & senf::operator<<(std::ostream & os, INet6Address const & addr)
{
    ::in6_addr ina;
    char buffer[5*8];
    std::copy(addr.begin(),addr.end(),&ina.s6_addr[0]);
    ::inet_ntop(AF_INET6,&ina,buffer,sizeof(buffer));
    buffer[sizeof(buffer)-1] = 0;
    os << buffer;
    return os;
}

prefix_ std::istream & senf::operator>>(std::istream & is, INet6Address & addr)
{
    std::string s;
    if (!(is >> s))
        return is;
    try {
        addr = INet6Address::from_string(s);
    }
    catch (AddressException &) {
        is.setstate(std::ios::failbit);
    }
    return is;
}

senf::INet6Address const senf::INet6Address::None;
senf::INet6Address const senf::INet6Address::Loopback   (0u,0u,0u,0u,0u,0u,0u,1u);
senf::INet6Address const senf::INet6Address::AllNodes   (0xFF02u,0u,0u,0u,0u,0u,0u,1u);
senf::INet6Address const senf::INet6Address::AllRouters (0xFF02u,0u,0u,0u,0u,0u,0u,2u);

//-/////////////////////////////////////////////////////////////////////////////////////////////////
// senf::INet6Network

prefix_ senf::INet6Network::INet6Network(std::string const & s)
{
    using boost::lambda::_1;
    using boost::lambda::_2;
    std::string::size_type i (s.find('/'));
    if (i == std::string::npos)
        throw AddressSyntaxException(s);
    try {
        prefix_len_ = prefix_len_checked( boost::lexical_cast<unsigned>(std::string(s,i+1)));
    } catch (boost::bad_lexical_cast const &) {
        throw AddressSyntaxException(s);
    }
    address_ = INet6Address::from_string(std::string(s, 0, i));
    detail::apply_mask(prefix_len_, address_.begin(), address_.end(), _1 &= _2);
}

prefix_ std::istream & senf::operator>>(std::istream & is, INet6Network & addr)
{
    std::string s;
    if (!(is >> s))
        return is;
    try {
        addr = INet6Network(s);
    }
    catch (AddressException &) {
        is.setstate(std::ios::failbit);
    }
    return is;
}

//-/////////////////////////////////////////////////////////////////////////////////////////////////
#undef prefix_
//#include "INet6Address.mpp"


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// fill-column: 100
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// c-file-style: "senf"
// indent-tabs-mode: nil
// ispell-local-dictionary: "american"
// compile-command: "scons -u test"
// End: