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// Copyright (C) 2010-2020 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#include <config.h>
#include <asiolink/asio_wrapper.h>
#include <asiolink/io_address.h>
#include <asiolink/io_error.h>
#include <exceptions/exceptions.h>
#include <boost/static_assert.hpp>
// moved to container_hash on recent boost versions (backward compatible)
#include <boost/functional/hash.hpp>
#include <unistd.h> // for some IPC/network system calls
#include <stdint.h>
#include <sys/socket.h>
#include <netinet/in.h>
using namespace boost::asio;
using boost::asio::ip::udp;
using boost::asio::ip::tcp;
using namespace std;
namespace isc {
namespace asiolink {
// XXX: we cannot simply construct the address in the initialization list,
// because we'd like to throw our own exception on failure.
IOAddress::IOAddress(const std::string& address_str) {
boost::system::error_code err;
asio_address_ = ip::address::from_string(address_str, err);
if (err) {
isc_throw(IOError, "Failed to convert string to address '"
<< address_str << "': " << err.message());
}
}
IOAddress::IOAddress(const boost::asio::ip::address& asio_address) :
asio_address_(asio_address)
{}
IOAddress::IOAddress(uint32_t v4address):
asio_address_(boost::asio::ip::address_v4(v4address)) {
}
string
IOAddress::toText() const {
return (asio_address_.to_string());
}
IOAddress
IOAddress::fromBytes(short family, const uint8_t* data) {
if (data == NULL) {
isc_throw(BadValue, "NULL pointer received.");
} else
if ( (family != AF_INET) && (family != AF_INET6) ) {
isc_throw(BadValue, "Invalid family type. Only AF_INET and AF_INET6"
<< "are supported");
}
BOOST_STATIC_ASSERT(INET6_ADDRSTRLEN >= INET_ADDRSTRLEN);
char addr_str[INET6_ADDRSTRLEN];
inet_ntop(family, data, addr_str, INET6_ADDRSTRLEN);
return IOAddress(string(addr_str));
}
std::vector<uint8_t>
IOAddress::toBytes() const {
if (asio_address_.is_v4()) {
const boost::asio::ip::address_v4::bytes_type bytes4 =
asio_address_.to_v4().to_bytes();
return (std::vector<uint8_t>(bytes4.begin(), bytes4.end()));
}
// Not V4 address, so must be a V6 address (else we could never construct
// this object).
const boost::asio::ip::address_v6::bytes_type bytes6 =
asio_address_.to_v6().to_bytes();
return (std::vector<uint8_t>(bytes6.begin(), bytes6.end()));
}
short
IOAddress::getFamily() const {
if (asio_address_.is_v4()) {
return (AF_INET);
} else {
return (AF_INET6);
}
}
bool
IOAddress::isV6LinkLocal() const {
if (!asio_address_.is_v6()) {
return (false);
}
return (asio_address_.to_v6().is_link_local());
}
bool
IOAddress::isV6Multicast() const {
if (!asio_address_.is_v6()) {
return (false);
}
return (asio_address_.to_v6().is_multicast());
}
uint32_t
IOAddress::toUint32() const {
if (asio_address_.is_v4()) {
return (asio_address_.to_v4().to_ulong());
} else {
isc_throw(BadValue, "Can't convert " << toText()
<< " address to IPv4.");
}
}
std::ostream&
operator<<(std::ostream& os, const IOAddress& address) {
os << address.toText();
return (os);
}
IOAddress
IOAddress::subtract(const IOAddress& a, const IOAddress& b) {
if (a.getFamily() != b.getFamily()) {
isc_throw(BadValue, "Both addresses have to be the same family");
}
if (a.isV4()) {
// Subtracting v4 is easy. We have a conversion function to uint32_t.
return (IOAddress(a.toUint32() - b.toUint32()));
} else {
// v6 is more involved.
// Let's extract the raw data first.
vector<uint8_t> a_vec = a.toBytes();
vector<uint8_t> b_vec = b.toBytes();
// ... and prepare the result
vector<uint8_t> result(V6ADDRESS_LEN,0);
// Carry is a boolean, but to avoid its frequent casting, let's
// use uint8_t. Also, some would prefer to call it borrow, but I prefer
// carry. Somewhat relevant discussion here:
// http://en.wikipedia.org/wiki/Carry_flag#Carry_flag_vs._Borrow_flag
uint8_t carry = 0;
// Now perform subtraction with borrow.
for (int i = a_vec.size() - 1; i >= 0; --i) {
result[i] = a_vec[i] - b_vec[i] - carry;
carry = (a_vec[i] < b_vec[i] + carry);
}
return (fromBytes(AF_INET6, &result[0]));
}
}
IOAddress
IOAddress::increase(const IOAddress& addr) {
std::vector<uint8_t> packed(addr.toBytes());
// Start increasing the least significant byte
for (int i = packed.size() - 1; i >= 0; --i) {
// if we haven't overflowed (0xff -> 0x0), than we are done
if (++packed[i] != 0) {
break;
}
}
return (IOAddress::fromBytes(addr.getFamily(), &packed[0]));
}
size_t
hash_value(const IOAddress& address) {
if (address.isV4()) {
boost::hash<uint32_t> hasher;
return (hasher(address.toUint32()));
} else {
boost::hash<std::vector<uint8_t> > hasher;
return (hasher(address.toBytes()));
}
}
} // namespace asiolink
} // namespace isc
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