master_loader.cc 8.98 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
// 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>
16
17
18
19
20
#include <dns/master_lexer.h>
#include <dns/name.h>
#include <dns/rrttl.h>
#include <dns/rrclass.h>
#include <dns/rrtype.h>
Michal 'vorner' Vaner's avatar
Michal 'vorner' Vaner committed
21
#include <dns/rdata.h>
22

23
24
#include <string>

25
using std::string;
26
27
28
29
30
31
32
33

namespace isc {
namespace dns {

class MasterLoader::MasterLoaderImpl {
public:
    MasterLoaderImpl(const char* master_file,
                     const Name& zone_origin,
34
35
                     const RRClass& zone_class,
                     const MasterLoaderCallbacks& callbacks,
36
                     const AddRRCallback& add_callback,
37
38
39
40
41
                     MasterLoader::Options options) :
        lexer_(),
        zone_origin_(zone_origin),
        zone_class_(zone_class),
        callbacks_(callbacks),
42
        add_callback_(add_callback),
43
44
45
        options_(options),
        master_file_(master_file),
        initialized_(false),
46
        ok_(true),
47
        many_errors_((options & MANY_ERRORS) != 0),
48
        complete_(false)
49
50
    {}

51
52
53
54
    void reportError(const std::string& filename, size_t line,
                     const std::string& reason)
    {
        callbacks_.error(filename, line, reason);
55
        if (!many_errors_) {
56
57
58
59
60
61
62
63
            // 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());
        }
    }

64
65
66
    void pushSource(const std::string& filename) {
        std::string error;
        if (!lexer_.pushSource(filename.c_str(), &error)) {
67
68
69
70
71
72
73
74
75
            if (initialized_) {
                // $INCLUDE file
                reportError(lexer_.getSourceName(), lexer_.getSourceLine(),
                            error);
            } else {
                // Top-level file
                reportError("", 0, error);
                ok_ = false;
            }
76
        }
77
78
79
80
81
82
        initialized_ = true;
    }

    void pushStreamSource(std::istream& stream) {
        lexer_.pushSource(stream);
        initialized_ = true;
83
84
    }

85
86
    // Get a string token. Handle it as error if it is not string.
    const string getString() {
87
        lexer_.getNextToken(MasterToken::STRING).getString(string_token_);
88
        return (string_token_);
89
90
    }

91
    bool loadIncremental(size_t count_limit);
92
93
94

private:
    MasterLexer lexer_;
95
    const Name zone_origin_;
96
97
    const RRClass zone_class_;
    MasterLoaderCallbacks callbacks_;
98
    AddRRCallback add_callback_;
99
    MasterLoader::Options options_;
100
    const std::string master_file_;
101
    std::string string_token_;
102
103
    bool initialized_;
    bool ok_;
104
    const bool many_errors_;
105
106
public:
    bool complete_;
107
108
};

109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
bool
MasterLoader::MasterLoaderImpl::loadIncremental(size_t count_limit) {
    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();

134
            const MasterToken::StringRegion&
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
                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.
165
            if (data) {
166
167
168
169
                add_callback_(name, rrclass, rrtype, ttl, data);

                // Good, we loaded another one
                ++count;
170
            } else if (!many_errors_) {
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
                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_);
}

212
213
MasterLoader::MasterLoader(const char* master_file,
                           const Name& zone_origin,
214
215
                           const RRClass& zone_class,
                           const MasterLoaderCallbacks& callbacks,
216
                           const AddRRCallback& add_callback,
217
218
                           Options options)
{
219
220
221
    if (add_callback.empty()) {
        isc_throw(isc::InvalidParameter, "Empty add RR callback");
    }
222
    impl_ = new MasterLoaderImpl(master_file, zone_origin,
223
                                 zone_class, callbacks, add_callback, options);
224
225
}

226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
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);
}

241
242
243
244
245
246
MasterLoader::~MasterLoader() {
    delete impl_;
}

bool
MasterLoader::loadIncremental(size_t count_limit) {
JINMEI Tatuya's avatar
JINMEI Tatuya committed
247
    const bool result = impl_->loadIncremental(count_limit);
248
249
    impl_->complete_ = result;
    return (result);
250
251
252
253
}

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