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// Copyright (C) 2010 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 <string.h>
#include <string>
#include <arpa/inet.h> // XXX: for inet_pton/ntop(), not exist in C++ standards
#include <sys/socket.h> // for AF_INET/AF_INET6
#include <exceptions/exceptions.h>
#include <util/io/buffer.h>
#include <dns/exceptions.h>
#include <dns/messagerenderer.h>
#include <dns/rdata.h>
#include <dns/rdataclass.h>
using namespace std;
using namespace isc::util::io;
// BEGIN_ISC_NAMESPACE
// BEGIN_RDATA_NAMESPACE
A::A(const string& addrstr) {
// RFC1035 states textual representation of IN/A RDATA is
// "four decimal numbers separated by dots without any embedded spaces".
// This is exactly what inet_pton() accepts for AF_INET. In particular,
// it rejects an abbreviated form such as "10.1" meaning "10.0.0.1".
if (inet_pton(AF_INET, addrstr.c_str(), &addr_) != 1) {
isc_throw(InvalidRdataText,
"IN/A RDATA construction from text failed: Address cannot be "
"converted: " << addrstr);
}
}
A::A(InputBuffer& buffer, size_t rdata_len) {
if (rdata_len != sizeof(addr_)) {
isc_throw(DNSMessageFORMERR,
"IN/A RDATA construction from wire failed: Invalid length: "
<< rdata_len);
}
if (buffer.getLength() - buffer.getPosition() < sizeof(addr_)) {
isc_throw(DNSMessageFORMERR,
"IN/A RDATA construction from wire failed: "
"insufficient buffer length: "
<< buffer.getLength() - buffer.getPosition());
}
buffer.readData(&addr_, sizeof(addr_));
}
A::A(const A& other) : Rdata(), addr_(other.addr_)
{}
void
A::toWire(OutputBuffer& buffer) const {
buffer.writeData(&addr_, sizeof(addr_));
}
void
A::toWire(MessageRenderer& renderer) const {
renderer.writeData(&addr_, sizeof(addr_));
}
string
A::toText() const {
char addr_string[sizeof("255.255.255.255")];
if (inet_ntop(AF_INET, &addr_, addr_string, sizeof(addr_string)) == NULL) {
isc_throw(Unexpected,
"Failed to convert IN/A RDATA to textual IPv4 address");
}
return (addr_string);
}
int
A::compare(const Rdata& other) const {
const A& other_a = dynamic_cast<const A&>(other);
return (memcmp(&addr_, &other_a.addr_, sizeof(addr_)));
}
// END_RDATA_NAMESPACE
// END_ISC_NAMESPACE
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