src/journal/test-compress.c

   1 /***
   2   This file is part of systemd
   3
   4   Copyright 2014 Ronny Chevalier
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include "compress.h"
  21 #include "util.h"
  22 #include "macro.h"
  23
  24 #ifdef HAVE_XZ
  25 # define XZ_OK 0
  26 #else
  27 # define XZ_OK -EPROTONOSUPPORT
  28 #endif
  29
  30 #ifdef HAVE_LZ4
  31 # define LZ4_OK 0
  32 #else
  33 # define LZ4_OK -EPROTONOSUPPORT
  34 #endif
  35
  36 typedef int (compress_blob_t)(const void *src, uint64_t src_size,
  37                               void *dst, size_t *dst_size);
  38 typedef int (decompress_blob_t)(const void *src, uint64_t src_size,
  39                                 void **dst, size_t *dst_alloc_size,
  40                                 size_t* dst_size, size_t dst_max);
  41 typedef int (decompress_sw_t)(const void *src, uint64_t src_size,
  42                               void **buffer, size_t *buffer_size,
  43                               const void *prefix, size_t prefix_len,
  44                               uint8_t extra);
  45
  46 typedef int (compress_stream_t)(int fdf, int fdt, off_t max_bytes);
  47 typedef int (decompress_stream_t)(int fdf, int fdt, off_t max_size);
  48
  49 static void test_compress_decompress(int compression,
  50                                      compress_blob_t compress,
  51                                      decompress_blob_t decompress,
  52                                      const char *data,
  53                                      size_t data_len,
  54                                      bool may_fail) {
  55         char compressed[512];
  56         size_t csize = 512;
  57         size_t usize = 0;
  58         _cleanup_free_ char *decompressed = NULL;
  59         int r;
  60
  61         log_info("/* testing %s %s blob compression/decompression */",
  62                  object_compressed_to_string(compression), data);
  63
  64         r = compress(data, data_len, compressed, &csize);
  65         if (r == -ENOBUFS) {
  66                 log_info_errno(-r, "compression failed: %m");
  67                 assert(may_fail);
  68         } else {
  69                 assert(r == 0);
  70                 r = decompress(compressed, csize,
  71                                (void **) &decompressed, &usize, &csize, 0);
  72                 assert(r == 0);
  73                 assert_se(decompressed);
  74                 assert_se(memcmp(decompressed, data, data_len) == 0);
  75         }
  76
  77         r = decompress("garbage", 7,
  78                        (void **) &decompressed, &usize, &csize, 0);
  79         assert(r < 0);
  80
  81         /* make sure to have the minimal lz4 compressed size */
  82         r = decompress("00000000\1g", 9,
  83                        (void **) &decompressed, &usize, &csize, 0);
  84         assert(r < 0);
  85
  86         r = decompress("\100000000g", 9,
  87                        (void **) &decompressed, &usize, &csize, 0);
  88         assert(r < 0);
  89
  90         memzero(decompressed, usize);
  91 }
  92
  93 static void test_decompress_startswith(int compression,
  94                                        compress_blob_t compress,
  95                                        decompress_sw_t decompress_sw,
  96                                        const char *data,
  97                                        size_t data_len,
  98                                        bool may_fail) {
  99
 100         char compressed[512];
 101         size_t csize = 512;
 102         size_t usize = 0;
 103         _cleanup_free_ char *decompressed = NULL;
 104         int r;
 105
 106         log_info("/* testing decompress_startswith with %s on %s text*/",
 107                  object_compressed_to_string(compression), data);
 108
 109         r = compress(data, data_len, compressed, &csize);
 110         if (r == -ENOBUFS) {
 111                 log_info_errno(-r, "compression failed: %m");
 112                 assert(may_fail);
 113                 return;
 114         }
 115         assert(r == 0);
 116
 117         assert_se(decompress_sw(compressed,
 118                                 csize,
 119                                 (void **) &decompressed,
 120                                 &usize,
 121                                 data, strlen(data), '\0') > 0);
 122         assert_se(decompress_sw(compressed,
 123                                 csize,
 124                                 (void **) &decompressed,
 125                                 &usize,
 126                                 data, strlen(data), 'w') == 0);
 127         assert_se(decompress_sw(compressed,
 128                                 csize,
 129                                 (void **) &decompressed,
 130                                 &usize,
 131                                 "barbarbar", 9, ' ') == 0);
 132         assert_se(decompress_sw(compressed,
 133                                 csize,
 134                                 (void **) &decompressed,
 135                                 &usize,
 136                                 data, strlen(data), '\0') > 0);
 137 }
 138
 139 static void test_compress_stream(int compression,
 140                                  const char* cat,
 141                                  compress_stream_t compress,
 142                                  decompress_stream_t decompress,
 143                                  const char *srcfile) {
 144
 145         _cleanup_close_ int src = -1, dst = -1, dst2 = -1;
 146         char pattern[] = "/tmp/systemd-test.xz.XXXXXX",
 147              pattern2[] = "/tmp/systemd-test.xz.XXXXXX";
 148         int r;
 149         _cleanup_free_ char *cmd = NULL, *cmd2;
 150         struct stat st = {};
 151
 152         log_debug("/* testing %s compression */",
 153                   object_compressed_to_string(compression));
 154
 155         log_debug("/* create source from %s */", srcfile);
 156
 157         assert_se((src = open(srcfile, O_RDONLY|O_CLOEXEC)) >= 0);
 158
 159         log_debug("/* test compression */");
 160
 161         assert_se((dst = mkostemp_safe(pattern, O_RDWR|O_CLOEXEC)) >= 0);
 162
 163         assert_se(compress(src, dst, -1) == 0);
 164
 165         if (cat) {
 166                 assert_se(asprintf(&cmd, "%s %s | diff %s -", cat, pattern, srcfile) > 0);
 167                 assert_se(system(cmd) == 0);
 168         }
 169
 170         log_debug("/* test decompression */");
 171
 172         assert_se((dst2 = mkostemp_safe(pattern2, O_RDWR|O_CLOEXEC)) >= 0);
 173
 174         assert_se(stat(srcfile, &st) == 0);
 175
 176         assert_se(lseek(dst, 0, SEEK_SET) == 0);
 177         r = decompress(dst, dst2, st.st_size);
 178         assert(r == 0);
 179
 180         assert_se(asprintf(&cmd2, "diff %s %s", srcfile, pattern2) > 0);
 181         assert_se(system(cmd2) == 0);
 182
 183         log_debug("/* test faulty decompression */");
 184
 185         assert_se(lseek(dst, 1, SEEK_SET) == 1);
 186         r = decompress(dst, dst2, st.st_size);
 187         assert(r == -EBADMSG);
 188
 189         assert_se(lseek(dst, 0, SEEK_SET) == 0);
 190         assert_se(lseek(dst2, 0, SEEK_SET) == 0);
 191         r = decompress(dst, dst2, st.st_size - 1);
 192         assert(r == -EFBIG);
 193
 194         assert_se(unlink(pattern) == 0);
 195         assert_se(unlink(pattern2) == 0);
 196 }
 197
 198 int main(int argc, char *argv[]) {
 199         const char text[] =
 200                 "text\0foofoofoofoo AAAA aaaaaaaaa ghost busters barbarbar FFF"
 201                 "foofoofoofoo AAAA aaaaaaaaa ghost busters barbarbar FFF";
 202
 203         char data[512] = "random\0";
 204
 205         log_set_max_level(LOG_DEBUG);
 206
 207         random_bytes(data + 7, sizeof(data) - 7);
 208
 209 #ifdef HAVE_XZ
 210         test_compress_decompress(OBJECT_COMPRESSED_XZ, compress_blob_xz, decompress_blob_xz,
 211                                  text, sizeof(text), false);
 212         test_compress_decompress(OBJECT_COMPRESSED_XZ, compress_blob_xz, decompress_blob_xz,
 213                                  data, sizeof(data), true);
 214         test_decompress_startswith(OBJECT_COMPRESSED_XZ,
 215                                    compress_blob_xz, decompress_startswith_xz,
 216                                    text, sizeof(text), false);
 217         test_decompress_startswith(OBJECT_COMPRESSED_XZ,
 218                                    compress_blob_xz, decompress_startswith_xz,
 219                                    data, sizeof(data), true);
 220         test_compress_stream(OBJECT_COMPRESSED_XZ, "xzcat",
 221                              compress_stream_xz, decompress_stream_xz, argv[0]);
 222 #else
 223         log_info("/* XZ test skipped */");
 224 #endif
 225
 226 #ifdef HAVE_LZ4
 227         test_compress_decompress(OBJECT_COMPRESSED_LZ4, compress_blob_lz4, decompress_blob_lz4,
 228                                  text, sizeof(text), false);
 229         test_compress_decompress(OBJECT_COMPRESSED_LZ4, compress_blob_lz4, decompress_blob_lz4,
 230                                  data, sizeof(data), true);
 231         test_decompress_startswith(OBJECT_COMPRESSED_LZ4,
 232                                    compress_blob_lz4, decompress_startswith_lz4,
 233                                    text, sizeof(text), false);
 234         test_decompress_startswith(OBJECT_COMPRESSED_LZ4,
 235                                    compress_blob_lz4, decompress_startswith_lz4,
 236                                    data, sizeof(data), true);
 237
 238         /* Produced stream is not compatible with lz4 binary, skip lz4cat check. */
 239         test_compress_stream(OBJECT_COMPRESSED_LZ4, NULL,
 240                              compress_stream_lz4, decompress_stream_lz4, argv[0]);
 241 #else
 242         log_info("/* LZ4 test skipped */");
 243 #endif
 244
 245         return 0;
 246 }