kea/src/lib/dhcp/option6_addrlst.cc

// Copyright (C) 2011  Internet Systems Consortium, Inc. ("ISC")
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
// PERFORMANCE OF THIS SOFTWARE.

#include <stdint.h>
#include <arpa/inet.h>
#include <sstream>
#include "exceptions/exceptions.h"

#include "asiolink/io_address.h"
#include "util/io_utilities.h"
#include "dhcp/libdhcp.h"
#include "dhcp/option6_addrlst.h"
#include "dhcp/dhcp6.h"

using namespace std;
using namespace isc;
using namespace isc::dhcp;
using namespace isc::asiolink;
using namespace isc::util;

Option6AddrLst::Option6AddrLst(unsigned short type,
                               const AddressContainer& addrs)
    :Option(V6, type), addrs_(addrs) {
}

Option6AddrLst::Option6AddrLst(unsigned short type,
                               const isc::asiolink::IOAddress& addr)
    :Option(V6, type), addrs_(1,addr) {
}

Option6AddrLst::Option6AddrLst(unsigned short type,
                               boost::shared_array<uint8_t> buf,
                               unsigned int buf_len,
                               unsigned int offset,
                               unsigned int option_len)
    :Option(V6, type) {
    unpack(buf, buf_len, offset, option_len);
}

void
Option6AddrLst::setAddress(const isc::asiolink::IOAddress& addr) {
    if (addr.getFamily() != AF_INET6) {
        isc_throw(BadValue, "Can't store non-IPv6 address in Option6AddrLst option");
    }

    addrs_.clear();
    addrs_.push_back(addr);
}

void
Option6AddrLst::setAddresses(const AddressContainer& addrs) {
    addrs_ = addrs;
}

unsigned int
Option6AddrLst::pack(boost::shared_array<uint8_t>& buf,
                    unsigned int buf_len,
                    unsigned int offset) {
    if (len() > buf_len) {
        isc_throw(OutOfRange, "Failed to pack IA option: len=" << len()
                  << ", buffer=" << buf_len << ": too small buffer.");
    }

    writeUint16(type_, &buf[offset]);
    offset += sizeof(uint16_t);

    // len() returns complete option length.
    // len field contains length without 4-byte option header
    writeUint16(len() - OPTION6_HDR_LEN, &buf[offset]);
    offset += sizeof(uint16_t);

    // this wrapping is *ugly*. I wish there was a a
    for (AddressContainer::const_iterator addr=addrs_.begin();
         addr!=addrs_.end();
         ++addr) {
        memcpy(&buf[offset],
               addr->getAddress().to_v6().to_bytes().data(),
               V6ADDRESS_LEN);
        offset += V6ADDRESS_LEN;
    }

    return offset;
}

unsigned int
Option6AddrLst::unpack(const boost::shared_array<uint8_t>& buf,
                       unsigned int buf_len,
                       unsigned int offset,
                       unsigned int option_len) {
    if (offset+option_len > buf_len) {
        isc_throw(OutOfRange, "Option " << type_
                  << " truncated.");
    }

    if (option_len%16) {
        isc_throw(OutOfRange, "Option " << type_
                  << " malformed: len=" << option_len
                  << " is not divisible by 16.");
    }
    while (option_len > 0) {
        addrs_.push_back(IOAddress::from_bytes(AF_INET6, &buf[offset]));
        offset += 16;
        option_len -= 16;
    }

    return offset;
}

std::string Option6AddrLst::toText(int indent /* =0 */) {
    stringstream tmp;
    for (int i=0; i<indent; i++)
        tmp << " ";

    tmp << "type=" << type_ << " " << addrs_.size() << "addr(s): ";

    for (AddressContainer::const_iterator addr=addrs_.begin();
         addr!=addrs_.end();
         ++addr) {
        tmp << addr->toText() << " ";
    }
    return tmp.str();
}

uint16_t Option6AddrLst::len() {

    return (OPTION6_HDR_LEN + addrs_.size()*16);
}