1 files changed, 174 insertions, 0 deletions
diff --git a/src/lib/dns/rdata/in_1/a_1.cc b/src/lib/dns/rdata/in_1/a_1.cc
new file mode 100644
index 0000000..c6585b9
--- /dev/null
+++ b/src/lib/dns/rdata/in_1/a_1.cc
@@ -0,0 +1,174 @@
+// Copyright (C) 2010-2015 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 <stdint.h>
+#include <string.h>
+
+#include <cerrno>
+#include <cstring>
+#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/buffer.h>
+
+#include <dns/exceptions.h>
+#include <dns/messagerenderer.h>
+#include <dns/master_lexer.h>
+#include <dns/master_loader_callbacks.h>
+#include <dns/rdata.h>
+#include <dns/rdataclass.h>
+
+using namespace std;
+using namespace isc::util;
+
+// BEGIN_ISC_NAMESPACE
+// BEGIN_RDATA_NAMESPACE
+
+namespace {
+void
+convertToIPv4Addr(const char* src, size_t src_len, uint32_t* dst) {
+    // This check specifically rejects invalid input that begins with valid
+    // address text followed by a nul character (and possibly followed by
+    // further garbage).  It cannot be detected by inet_pton().
+    //
+    // Note that this is private subroutine of the in::A constructors, which
+    // pass std::string.size() or StringRegion::len as src_len, so it should
+    // be equal to strlen() unless there's an intermediate nul character.
+    if (src_len != strlen(src)) {
+        isc_throw(InvalidRdataText,
+                  "Bad IN/A RDATA text: unexpected nul in string: '"
+                  << src << "'");
+    }
+    const int result = inet_pton(AF_INET, src, dst);
+    if (result == 0) {
+        isc_throw(InvalidRdataText, "Bad IN/A RDATA text: '" << src << "'");
+    } else if (result < 0) {
+        isc_throw(isc::Unexpected,
+                  "Unexpected failure in parsing IN/A RDATA text: '"
+                  << src << "': " << std::strerror(errno));
+    }
+}
+}
+
+/// \brief Constructor from string.
+///
+/// The given string must be a valid textual representation of an IPv4
+/// address as specified in RFC1035, that is, four decimal numbers separated
+/// by dots without any embedded spaces.  Note that it excludes abbreviated
+/// forms such as "10.1" to mean "10.0.0.1".
+///
+/// Internally, this implementation uses the standard inet_pton() library
+/// function for the AF_INET family to parse and convert the textual
+/// representation.  While standard compliant implementations of this function
+/// should accept exactly what this constructor expects, specific
+/// implementation may behave differently, in which case this constructor
+/// will simply accept the result of inet_pton().  In any case, the user of
+/// the class shouldn't assume such specific implementation behavior of
+/// inet_pton().
+///
+/// No extra character should be contained in \c addrstr other than the
+/// textual address.  These include spaces and the nul character.
+///
+/// \throw InvalidRdata The text extracted by the lexer isn't recognized as
+/// a valid IPv4 address.
+/// \throw Unexpected Unexpected system error in conversion (this should be
+/// very rare).
+///
+/// \param addrstr Textual representation of IPv4 address to be used as the
+/// RDATA.
+A::A(const std::string& addrstr) {
+    convertToIPv4Addr(addrstr.c_str(), addrstr.size(), &addr_);
+}
+
+/// \brief Constructor with a context of MasterLexer.
+///
+/// The \c lexer should point to the beginning of valid textual representation
+/// of a class IN A RDATA.
+///
+/// The acceptable form of the textual address is generally the same as the
+/// string version of the constructor, but this version accepts beginning
+/// spaces and trailing spaces or other characters.  Trailing non space
+/// characters would be considered an invalid form in an RR representation,
+/// but handling such errors is not the responsibility of this constructor.
+/// It also accepts other unusual syntax that would be considered valid
+/// in the context of DNS master file; for example, it accepts an IPv4
+/// address surrounded by parentheses, such as "(192.0.2.1)", although it's
+/// very unlikely to be used for this type of RDATA.
+///
+/// \throw MasterLexer::LexerError General parsing error such as missing field.
+/// \throw InvalidRdata The text extracted by the lexer isn't recognized as
+/// a valid IPv4 address.
+/// \throw Unexpected Unexpected system error in conversion (this should be
+/// very rare).
+///
+/// \param lexer A \c MasterLexer object parsing a master file for the
+/// RDATA to be created
+A::A(MasterLexer& lexer, const Name*,
+     MasterLoader::Options, MasterLoaderCallbacks&)
+{
+    const MasterToken& token = lexer.getNextToken(MasterToken::STRING);
+    convertToIPv4Addr(token.getStringRegion().beg, token.getStringRegion().len,
+                      &addr_);
+}
+
+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_));
+}
+
+/// \brief Copy constructor.
+A::A(const A& other) : Rdata(), addr_(other.addr_)
+{}
+
+void
+A::toWire(OutputBuffer& buffer) const {
+    buffer.writeData(&addr_, sizeof(addr_));
+}
+
+void
+A::toWire(AbstractMessageRenderer& renderer) const {
+    renderer.writeData(&addr_, sizeof(addr_));
+}
+
+/// \brief Return a textual form of the underlying IPv4 address of the RDATA.
+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);
+}
+
+/// \brief Compare two in::A RDATAs.
+///
+/// In effect, it compares the two RDATA as an unsigned 32-bit integer.
+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