master_loader.cc 9.08 KB
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// Copyright (C) 2012  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 <dns/master_loader.h>
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#include <dns/master_lexer.h>
#include <dns/name.h>
#include <dns/rrttl.h>
#include <dns/rrclass.h>
#include <dns/rrtype.h>
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#include <dns/rdata.h>
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#include <string>

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using std::string;
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namespace isc {
namespace dns {

class MasterLoader::MasterLoaderImpl {
public:
    MasterLoaderImpl(const char* master_file,
                     const Name& zone_origin,
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                     const RRClass& zone_class,
                     const MasterLoaderCallbacks& callbacks,
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                     const AddRRCallback& add_callback,
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                     MasterLoader::Options options) :
        lexer_(),
        zone_origin_(zone_origin),
        zone_class_(zone_class),
        callbacks_(callbacks),
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        add_callback_(add_callback),
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        options_(options),
        master_file_(master_file),
        initialized_(false),
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        ok_(true),
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        many_errors_((options & MANY_ERRORS) != 0),
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        complete_(false)
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    {}

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    void reportError(const std::string& filename, size_t line,
                     const std::string& reason)
    {
        callbacks_.error(filename, line, reason);
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        if (!many_errors_) {
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            // In case we don't have the lenient mode, every error is fatal
            // and we throw
            ok_ = false;
            complete_ = true;
            isc_throw(MasterLoaderError, reason.c_str());
        }
    }

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    void pushSource(const std::string& filename) {
        std::string error;
        if (!lexer_.pushSource(filename.c_str(), &error)) {
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            if (initialized_) {
                // $INCLUDE file
                reportError(lexer_.getSourceName(), lexer_.getSourceLine(),
                            error);
            } else {
                // Top-level file
                reportError("", 0, error);
                ok_ = false;
            }
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        }
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        initialized_ = true;
    }

    void pushStreamSource(std::istream& stream) {
        lexer_.pushSource(stream);
        initialized_ = true;
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    }

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    // Get a string token. Handle it as error if it is not string.
    const string getString() {
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        lexer_.getNextToken(MasterToken::STRING).getString(string_token_);
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        return (string_token_);
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    }

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    bool loadIncremental(size_t count_limit);
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private:
    MasterLexer lexer_;
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    const Name zone_origin_;
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    const RRClass zone_class_;
    MasterLoaderCallbacks callbacks_;
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    AddRRCallback add_callback_;
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    const MasterLoader::Options options_;
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    const std::string master_file_;
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    std::string string_token_;
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    bool initialized_;
    bool ok_;
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    const bool many_errors_;
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public:
    bool complete_;
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};

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bool
MasterLoader::MasterLoaderImpl::loadIncremental(size_t count_limit) {
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    if (count_limit == 0) {
        isc_throw(isc::InvalidParameter, "Count limit set to 0");
    }
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    if (complete_) {
        isc_throw(isc::InvalidOperation,
                  "Trying to load when already loaded");
    }
    if (!initialized_) {
        pushSource(master_file_);
    }
    size_t count = 0;
    while (ok_ && count < count_limit) {
        try {
            // Skip all EOLNs (empty lines) and finish on EOF
            bool empty = true;
            do {
                const MasterToken& empty_token(lexer_.getNextToken());
                if (empty_token.getType() == MasterToken::END_OF_FILE) {
                    // TODO: Check if this is the last source, possibly pop
                    return (true);
                }
                empty = empty_token.getType() == MasterToken::END_OF_LINE;
            } while (empty);
            // Return the last token, as it was not empty
            lexer_.ungetToken();

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            const MasterToken::StringRegion&
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                name_string(lexer_.getNextToken(MasterToken::QSTRING).
                            getStringRegion());
            // TODO $ handling
            const Name name(name_string.beg, name_string.len,
                            &zone_origin_);
            // TODO: Some more flexibility. We don't allow omitting
            // anything yet

            // The parameters
            const RRTTL ttl(getString());
            const RRClass rrclass(getString());
            const RRType rrtype(getString());

            // TODO: Some more validation?
            if (rrclass != zone_class_) {
                // It doesn't really matter much what type of exception
                // we throw, we catch it just below.
                isc_throw(isc::BadValue, "Class mismatch: " << rrclass <<
                          "vs. " << zone_class_);
            }

            const rdata::RdataPtr data(rdata::createRdata(rrtype, rrclass,
                                                          lexer_,
                                                          &zone_origin_,
                                                          options_,
                                                          callbacks_));
            // In case we get NULL, it means there was error creating
            // the Rdata. The errors should have been reported by
            // callbacks_ already. We need to decide if we want to continue
            // or not.
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            if (data) {
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                add_callback_(name, rrclass, rrtype, ttl, data);

                // Good, we loaded another one
                ++count;
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            } else if (!many_errors_) {
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                ok_ = false;
                complete_ = true;
                // We don't have the exact error here, but it was reported
                // by the error callback.
                isc_throw(MasterLoaderError, "Invalid RR data");
            }
        } catch (const MasterLoaderError&) {
            // This is a hack. We exclude the MasterLoaderError from the
            // below case. Once we restrict the below to some smaller
            // exception, we should remove this.
            throw;
        } catch (const isc::Exception& e) {
            // TODO: Once we do #2518, catch only the DNSTextError here,
            // not isc::Exception. The rest should be just simply
            // propagated.
            reportError(lexer_.getSourceName(), lexer_.getSourceLine(),
                        e.what());
            // We want to continue. Try to read until the end of line
            bool end = false;
            do {
                const MasterToken& token(lexer_.getNextToken());
                switch (token.getType()) {
                    case MasterToken::END_OF_FILE:
                        // TODO: Try pop in case this is not the only
                        // source
                        return (true);
                    case MasterToken::END_OF_LINE:
                        end = true;
                        break;
                    default:
                        // Do nothing. This is just to make compiler
                        // happy
                        break;
                }
            } while (!end);
        }
    }
    // When there was a fatal error and ok is false, we say we are done.
    return (!ok_);
}

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MasterLoader::MasterLoader(const char* master_file,
                           const Name& zone_origin,
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                           const RRClass& zone_class,
                           const MasterLoaderCallbacks& callbacks,
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                           const AddRRCallback& add_callback,
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                           Options options)
{
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    if (add_callback.empty()) {
        isc_throw(isc::InvalidParameter, "Empty add RR callback");
    }
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    impl_ = new MasterLoaderImpl(master_file, zone_origin,
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                                 zone_class, callbacks, add_callback, options);
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}

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MasterLoader::MasterLoader(std::istream& stream,
                           const Name& zone_origin,
                           const RRClass& zone_class,
                           const MasterLoaderCallbacks& callbacks,
                           const AddRRCallback& add_callback,
                           Options options)
{
    if (add_callback.empty()) {
        isc_throw(isc::InvalidParameter, "Empty add RR callback");
    }
    impl_ = new MasterLoaderImpl("", zone_origin, zone_class, callbacks,
                                 add_callback, options);
    impl_->pushStreamSource(stream);
}

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MasterLoader::~MasterLoader() {
    delete impl_;
}

bool
MasterLoader::loadIncremental(size_t count_limit) {
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    const bool result = impl_->loadIncremental(count_limit);
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    impl_->complete_ = result;
    return (result);
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}

} // end namespace dns
} // end namespace isc