summaryrefslogtreecommitdiffstats
path: root/src/journal/test-compress.c
blob: 0990f7604d549d5bc2660b353c4810dc272f0c52 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
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
134
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
165
166
167
168
169
170
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
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
/* SPDX-License-Identifier: LGPL-2.1+ */

#include <sys/stat.h>

#if HAVE_LZ4
#include <lz4.h>
#endif

#include "alloc-util.h"
#include "compress.h"
#include "fd-util.h"
#include "fs-util.h"
#include "macro.h"
#include "memory-util.h"
#include "path-util.h"
#include "random-util.h"
#include "tests.h"
#include "tmpfile-util.h"

#if HAVE_XZ
# define XZ_OK 0
#else
# define XZ_OK -EPROTONOSUPPORT
#endif

#if HAVE_LZ4
# define LZ4_OK 0
#else
# define LZ4_OK -EPROTONOSUPPORT
#endif

#define HUGE_SIZE (4096*1024)

typedef int (compress_blob_t)(const void *src, uint64_t src_size,
                              void *dst, size_t dst_alloc_size, size_t *dst_size);
typedef int (decompress_blob_t)(const void *src, uint64_t src_size,
                                void **dst, size_t *dst_alloc_size,
                                size_t* dst_size, size_t dst_max);
typedef int (decompress_sw_t)(const void *src, uint64_t src_size,
                              void **buffer, size_t *buffer_size,
                              const void *prefix, size_t prefix_len,
                              uint8_t extra);

typedef int (compress_stream_t)(int fdf, int fdt, uint64_t max_bytes);
typedef int (decompress_stream_t)(int fdf, int fdt, uint64_t max_size);

#if HAVE_COMPRESSION
_unused_ static void test_compress_decompress(const char *compression,
                                              compress_blob_t compress,
                                              decompress_blob_t decompress,
                                              const char *data,
                                              size_t data_len,
                                              bool may_fail) {
        char compressed[512];
        size_t csize, usize = 0;
        _cleanup_free_ char *decompressed = NULL;
        int r;

        log_info("/* testing %s %s blob compression/decompression */",
                 compression, data);

        r = compress(data, data_len, compressed, sizeof(compressed), &csize);
        if (r == -ENOBUFS) {
                log_info_errno(r, "compression failed: %m");
                assert_se(may_fail);
        } else {
                assert_se(r == 0);
                r = decompress(compressed, csize,
                               (void **) &decompressed, &usize, &csize, 0);
                assert_se(r == 0);
                assert_se(decompressed);
                assert_se(memcmp(decompressed, data, data_len) == 0);
        }

        r = decompress("garbage", 7,
                       (void **) &decompressed, &usize, &csize, 0);
        assert_se(r < 0);

        /* make sure to have the minimal lz4 compressed size */
        r = decompress("00000000\1g", 9,
                       (void **) &decompressed, &usize, &csize, 0);
        assert_se(r < 0);

        r = decompress("\100000000g", 9,
                       (void **) &decompressed, &usize, &csize, 0);
        assert_se(r < 0);

        memzero(decompressed, usize);
}

_unused_ static void test_decompress_startswith(const char *compression,
                                                compress_blob_t compress,
                                                decompress_sw_t decompress_sw,
                                                const char *data,
                                                size_t data_len,
                                                bool may_fail) {

        char *compressed;
        _cleanup_free_ char *compressed1 = NULL, *compressed2 = NULL, *decompressed = NULL;
        size_t csize, usize = 0, len;
        int r;

        log_info("/* testing decompress_startswith with %s on %.20s text */",
                 compression, data);

#define BUFSIZE_1 512
#define BUFSIZE_2 20000

        compressed = compressed1 = malloc(BUFSIZE_1);
        assert_se(compressed1);
        r = compress(data, data_len, compressed, BUFSIZE_1, &csize);
        if (r == -ENOBUFS) {
                log_info_errno(r, "compression failed: %m");
                assert_se(may_fail);

                compressed = compressed2 = malloc(BUFSIZE_2);
                assert_se(compressed2);
                r = compress(data, data_len, compressed, BUFSIZE_2, &csize);
                assert(r == 0);
        }
        assert_se(r == 0);

        len = strlen(data);

        r = decompress_sw(compressed, csize, (void **) &decompressed, &usize, data, len, '\0');
        assert_se(r > 0);
        r = decompress_sw(compressed, csize, (void **) &decompressed, &usize, data, len, 'w');
        assert_se(r == 0);
        r = decompress_sw(compressed, csize, (void **) &decompressed, &usize, "barbarbar", 9, ' ');
        assert_se(r == 0);
        r = decompress_sw(compressed, csize, (void **) &decompressed, &usize, data, len - 1, data[len-1]);
        assert_se(r > 0);
        r = decompress_sw(compressed, csize, (void **) &decompressed, &usize, data, len - 1, 'w');
        assert_se(r == 0);
        r = decompress_sw(compressed, csize, (void **) &decompressed, &usize, data, len, '\0');
        assert_se(r > 0);
}

_unused_ static void test_decompress_startswith_short(const char *compression,
                                                      compress_blob_t compress,
                                                      decompress_sw_t decompress_sw) {

#define TEXT "HUGE=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

        char buf[1024];
        size_t i, csize;
        int r;

        log_info("/* %s with %s */", __func__, compression);

        r = compress(TEXT, sizeof TEXT, buf, sizeof buf, &csize);
        assert_se(r == 0);

        for (i = 1; i < strlen(TEXT); i++) {
                size_t alloc_size = i;
                _cleanup_free_ void *buf2 = NULL;

                assert_se(buf2 = malloc(i));

                assert_se(decompress_sw(buf, csize, &buf2, &alloc_size, TEXT, i, TEXT[i]) == 1);
                assert_se(decompress_sw(buf, csize, &buf2, &alloc_size, TEXT, i, 'y') == 0);
        }
}

_unused_ static void test_compress_stream(const char *compression,
                                          const char *cat,
                                          compress_stream_t compress,
                                          decompress_stream_t decompress,
                                          const char *srcfile) {

        _cleanup_close_ int src = -1, dst = -1, dst2 = -1;
        _cleanup_(unlink_tempfilep) char
                pattern[] = "/tmp/systemd-test.compressed.XXXXXX",
                pattern2[] = "/tmp/systemd-test.compressed.XXXXXX";
        int r;
        _cleanup_free_ char *cmd = NULL, *cmd2 = NULL;
        struct stat st = {};

        r = find_binary(cat, NULL);
        if (r < 0) {
                log_error_errno(r, "Skipping %s, could not find %s binary: %m", __func__, cat);
                return;
        }

        log_debug("/* testing %s compression */", compression);

        log_debug("/* create source from %s */", srcfile);

        assert_se((src = open(srcfile, O_RDONLY|O_CLOEXEC)) >= 0);

        log_debug("/* test compression */");

        assert_se((dst = mkostemp_safe(pattern)) >= 0);

        assert_se(compress(src, dst, -1) == 0);

        if (cat) {
                assert_se(asprintf(&cmd, "%s %s | diff %s -", cat, pattern, srcfile) > 0);
                assert_se(system(cmd) == 0);
        }

        log_debug("/* test decompression */");

        assert_se((dst2 = mkostemp_safe(pattern2)) >= 0);

        assert_se(stat(srcfile, &st) == 0);

        assert_se(lseek(dst, 0, SEEK_SET) == 0);
        r = decompress(dst, dst2, st.st_size);
        assert_se(r == 0);

        assert_se(asprintf(&cmd2, "diff %s %s", srcfile, pattern2) > 0);
        assert_se(system(cmd2) == 0);

        log_debug("/* test faulty decompression */");

        assert_se(lseek(dst, 1, SEEK_SET) == 1);
        r = decompress(dst, dst2, st.st_size);
        assert_se(IN_SET(r, 0, -EBADMSG));

        assert_se(lseek(dst, 0, SEEK_SET) == 0);
        assert_se(lseek(dst2, 0, SEEK_SET) == 0);
        r = decompress(dst, dst2, st.st_size - 1);
        assert_se(r == -EFBIG);
}
#endif

#if HAVE_LZ4
static void test_lz4_decompress_partial(void) {
        char buf[20000], buf2[100];
        size_t buf_size = sizeof(buf), compressed;
        int r;
        _cleanup_free_ char *huge = NULL;

        assert_se(huge = malloc(HUGE_SIZE));
        memcpy(huge, "HUGE=", STRLEN("HUGE="));
        memset(&huge[STRLEN("HUGE=")], 'x', HUGE_SIZE - STRLEN("HUGE=") - 1);
        huge[HUGE_SIZE - 1] = '\0';

        r = LZ4_compress_default(huge, buf, HUGE_SIZE, buf_size);
        assert_se(r >= 0);
        compressed = r;
        log_info("Compressed %i → %zu", HUGE_SIZE, compressed);

        r = LZ4_decompress_safe(buf, huge, r, HUGE_SIZE);
        assert_se(r >= 0);
        log_info("Decompressed → %i", r);

        r = LZ4_decompress_safe_partial(buf, huge,
                                        compressed,
                                        12, HUGE_SIZE);
        assert_se(r >= 0);
        log_info("Decompressed partial %i/%i → %i", 12, HUGE_SIZE, r);

        for (size_t size = 1; size < sizeof(buf2); size++) {
                /* This failed in older lz4s but works in newer ones. */
                r = LZ4_decompress_safe_partial(buf, buf2, compressed, size, size);
                log_info("Decompressed partial %zu/%zu → %i (%s)", size, size, r,
                                                                   r < 0 ? "bad" : "good");
                if (r >= 0 && LZ4_versionNumber() >= 10803)
                        /* lz4 <= 1.8.2 should fail that test, let's only check for newer ones */
                        assert_se(memcmp(buf2, huge, r) == 0);
        }
}
#endif

int main(int argc, char *argv[]) {
#if HAVE_COMPRESSION
        _unused_ const char text[] =
                "text\0foofoofoofoo AAAA aaaaaaaaa ghost busters barbarbar FFF"
                "foofoofoofoo AAAA aaaaaaaaa ghost busters barbarbar FFF";

        /* The file to test compression on can be specified as the first argument */
        const char *srcfile = argc > 1 ? argv[1] : argv[0];

        char data[512] = "random\0";

        _cleanup_free_ char *huge = NULL;

        assert_se(huge = malloc(HUGE_SIZE));
        memcpy(huge, "HUGE=", STRLEN("HUGE="));
        memset(&huge[STRLEN("HUGE=")], 'x', HUGE_SIZE - STRLEN("HUGE=") - 1);
        huge[HUGE_SIZE - 1] = '\0';

        test_setup_logging(LOG_DEBUG);

        random_bytes(data + 7, sizeof(data) - 7);

#if HAVE_XZ
        test_compress_decompress("XZ", compress_blob_xz, decompress_blob_xz,
                                 text, sizeof(text), false);
        test_compress_decompress("XZ", compress_blob_xz, decompress_blob_xz,
                                 data, sizeof(data), true);

        test_decompress_startswith("XZ",
                                   compress_blob_xz, decompress_startswith_xz,
                                   text, sizeof(text), false);
        test_decompress_startswith("XZ",
                                   compress_blob_xz, decompress_startswith_xz,
                                   data, sizeof(data), true);
        test_decompress_startswith("XZ",
                                   compress_blob_xz, decompress_startswith_xz,
                                   huge, HUGE_SIZE, true);

        test_compress_stream("XZ", "xzcat",
                             compress_stream_xz, decompress_stream_xz, srcfile);

        test_decompress_startswith_short("XZ", compress_blob_xz, decompress_startswith_xz);

#else
        log_info("/* XZ test skipped */");
#endif

#if HAVE_LZ4
        test_compress_decompress("LZ4", compress_blob_lz4, decompress_blob_lz4,
                                 text, sizeof(text), false);
        test_compress_decompress("LZ4", compress_blob_lz4, decompress_blob_lz4,
                                 data, sizeof(data), true);

        test_decompress_startswith("LZ4",
                                   compress_blob_lz4, decompress_startswith_lz4,
                                   text, sizeof(text), false);
        test_decompress_startswith("LZ4",
                                   compress_blob_lz4, decompress_startswith_lz4,
                                   data, sizeof(data), true);
        test_decompress_startswith("LZ4",
                                   compress_blob_lz4, decompress_startswith_lz4,
                                   huge, HUGE_SIZE, true);

        test_compress_stream("LZ4", "lz4cat",
                             compress_stream_lz4, decompress_stream_lz4, srcfile);

        test_lz4_decompress_partial();

        test_decompress_startswith_short("LZ4", compress_blob_lz4, decompress_startswith_lz4);

#else
        log_info("/* LZ4 test skipped */");
#endif

#if HAVE_ZSTD
        test_compress_decompress("ZSTD", compress_blob_zstd, decompress_blob_zstd,
                                 text, sizeof(text), false);
        test_compress_decompress("ZSTD", compress_blob_zstd, decompress_blob_zstd,
                                 data, sizeof(data), true);

        test_decompress_startswith("ZSTD",
                                   compress_blob_zstd, decompress_startswith_zstd,
                                   text, sizeof(text), false);
        test_decompress_startswith("ZSTD",
                                   compress_blob_zstd, decompress_startswith_zstd,
                                   data, sizeof(data), true);
        test_decompress_startswith("ZSTD",
                                   compress_blob_zstd, decompress_startswith_zstd,
                                   huge, HUGE_SIZE, true);

        test_compress_stream("ZSTD", "zstdcat",
                             compress_stream_zstd, decompress_stream_zstd, srcfile);

        test_decompress_startswith_short("ZSTD", compress_blob_zstd, decompress_startswith_zstd);
#else
        log_info("/* ZSTD test skipped */");
#endif

        return 0;
#else
        log_info("/* XZ, LZ4 and ZSTD tests skipped */");
        return EXIT_TEST_SKIP;
#endif
}