src/fssum.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2012 STRATO AG.  All rights reserved.
   4  */
   5 #ifdef __linux__
   6 #define _BSD_SOURCE
   7 #define _DEFAULT_SOURCE
   8 #define _LARGEFILE64_SOURCE
   9 #ifndef _GNU_SOURCE
  10 #define _GNU_SOURCE
  11 #endif
  12 #endif
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <string.h>
  17 #include <fcntl.h>
  18 #include <dirent.h>
  19 #include <errno.h>
  20 #include <sys/types.h>
  21 #include <sys/stat.h>
  22 #include <sys/sysmacros.h>
  23 #ifdef __SOLARIS__
  24 #include <sys/mkdev.h>
  25 #endif
  26 #include "md5.h"
  27 #include <netinet/in.h>
  28 #include <inttypes.h>
  29 #include <assert.h>
  30 #include <endian.h>
  31
  32 #define CS_SIZE 16
  33 #define CHUNKS  128
  34
  35 #ifdef __linux__
  36 #ifndef SEEK_DATA
  37 #define SEEK_DATA 3
  38 #define SEEK_HOLE 4
  39 #endif
  40 #endif
  41
  42 /* TODO: add hardlink recognition */
  43 /* TODO: add xattr/acl */
  44
  45 struct excludes {
  46         char *path;
  47         int len;
  48 };
  49
  50 typedef struct _sum {
  51         MD5_CTX         md5;
  52         unsigned char   out[16];
  53 } sum_t;
  54
  55 typedef int (*sum_file_data_t)(int fd, sum_t *dst);
  56
  57 int gen_manifest = 0;
  58 int in_manifest = 0;
  59 char *checksum = NULL;
  60 struct excludes *excludes;
  61 int n_excludes = 0;
  62 int verbose = 0;
  63 FILE *out_fp;
  64 FILE *in_fp;
  65
  66 enum _flags {
  67         FLAG_UID,
  68         FLAG_GID,
  69         FLAG_MODE,
  70         FLAG_ATIME,
  71         FLAG_MTIME,
  72         FLAG_CTIME,
  73         FLAG_DATA,
  74         FLAG_OPEN_ERROR,
  75         FLAG_STRUCTURE,
  76         NUM_FLAGS
  77 };
  78
  79 const char flchar[] = "ugoamcdes";
  80 char line[65536];
  81
  82 int flags[NUM_FLAGS] = {1, 1, 1, 1, 1, 0, 1, 0, 0};
  83
  84 char *
  85 getln(char *buf, int size, FILE *fp)
  86 {
  87         char *p;
  88         int l;
  89
  90         p = fgets(buf, size, fp);
  91         if (!p)
  92                 return NULL;
  93
  94         l = strlen(p);
  95         while(l > 0  && (p[l - 1] == '\n' || p[l - 1] == '\r'))
  96                 p[--l] = 0;
  97
  98         return p;
  99 }
 100
 101 void
 102 parse_flag(int c)
 103 {
 104         int i;
 105         int is_upper = 0;
 106
 107         if (c >= 'A' && c <= 'Z') {
 108                 is_upper = 1;
 109                 c += 'a' - 'A';
 110         }
 111         for (i = 0; flchar[i]; ++i) {
 112                 if (flchar[i] == c) {
 113                         flags[i] = is_upper ? 0 : 1;
 114                         return;
 115                 }
 116         }
 117         fprintf(stderr, "unrecognized flag %c\n", c);
 118         exit(-1);
 119 }
 120
 121 void
 122 parse_flags(char *p)
 123 {
 124         while (*p)
 125                 parse_flag(*p++);
 126 }
 127
 128 void
 129 usage(void)
 130 {
 131         fprintf(stderr, "usage: fssum <options> <path>\n");
 132         fprintf(stderr, "  options:\n");
 133         fprintf(stderr, "    -f          : write out a full manifest file\n");
 134         fprintf(stderr, "    -w <file>   : send output to file\n");
 135         fprintf(stderr, "    -v          : verbose mode (debugging only)\n");
 136         fprintf(stderr,
 137                 "    -r <file>   : read checksum or manifest from file\n");
 138         fprintf(stderr, "    -[ugoamcde] : specify which fields to include in checksum calculation.\n");
 139         fprintf(stderr, "         u      : include uid\n");
 140         fprintf(stderr, "         g      : include gid\n");
 141         fprintf(stderr, "         o      : include mode\n");
 142         fprintf(stderr, "         m      : include mtime\n");
 143         fprintf(stderr, "         a      : include atime\n");
 144         fprintf(stderr, "         c      : include ctime\n");
 145         fprintf(stderr, "         d      : include file data\n");
 146         fprintf(stderr, "         e      : include open errors (aborts otherwise)\n");
 147         fprintf(stderr, "         s      : include block structure (holes)\n");
 148         fprintf(stderr, "    -[UGOAMCDES]: exclude respective field from calculation\n");
 149         fprintf(stderr, "    -n          : reset all flags\n");
 150         fprintf(stderr, "    -N          : set all flags\n");
 151         fprintf(stderr, "    -x path     : exclude path when building checksum (multiple ok)\n");
 152         fprintf(stderr, "    -h          : this help\n\n");
 153         fprintf(stderr, "The default field mask is ugoamCdES. If the checksum/manifest is read from a\n");
 154         fprintf(stderr, "file, the mask is taken from there and the values given on the command line\n");
 155         fprintf(stderr, "are ignored.\n");
 156         exit(-1);
 157 }
 158
 159 static char buf[65536];
 160
 161 void *
 162 alloc(size_t sz)
 163 {
 164         void *p = malloc(sz);
 165
 166         if (!p) {
 167                 fprintf(stderr, "malloc failed\n");
 168                 exit(-1);
 169         }
 170
 171         return p;
 172 }
 173
 174 void
 175 sum_init(sum_t *cs)
 176 {
 177         MD5_Init(&cs->md5);
 178 }
 179
 180 void
 181 sum_fini(sum_t *cs)
 182 {
 183         MD5_Final(cs->out, &cs->md5);
 184 }
 185
 186 void
 187 sum_add(sum_t *cs, void *buf, int size)
 188 {
 189         MD5_Update(&cs->md5, buf, size);
 190 }
 191
 192 void
 193 sum_add_sum(sum_t *dst, sum_t *src)
 194 {
 195         sum_add(dst, src->out, sizeof(src->out));
 196 }
 197
 198 void
 199 sum_add_u64(sum_t *dst, uint64_t val)
 200 {
 201         uint64_t v = htobe64(val);
 202         sum_add(dst, &v, sizeof(v));
 203 }
 204
 205 void
 206 sum_add_time(sum_t *dst, time_t t)
 207 {
 208         sum_add_u64(dst, t);
 209 }
 210
 211 char *
 212 sum_to_string(sum_t *dst)
 213 {
 214         int i;
 215         char *s = alloc(CS_SIZE * 2 + 1);
 216
 217         for (i = 0; i < CS_SIZE; ++i)
 218                 sprintf(s + i * 2, "%02x", dst->out[i]);
 219
 220         return s;
 221 }
 222
 223 int
 224 sum_file_data_permissive(int fd, sum_t *dst)
 225 {
 226         int ret;
 227
 228         while (1) {
 229                 ret = read(fd, buf, sizeof(buf));
 230                 if (ret < 0)
 231                         return -errno;
 232                 sum_add(dst, buf, ret);
 233                 if (ret < sizeof(buf))
 234                         break;
 235         }
 236         return 0;
 237 }
 238
 239 int
 240 sum_file_data_strict(int fd, sum_t *dst)
 241 {
 242         int ret;
 243         off_t pos;
 244
 245         pos = lseek(fd, 0, SEEK_CUR);
 246         if (pos == (off_t)-1)
 247                 return errno == ENXIO ? 0 : -2;
 248
 249         while (1) {
 250                 pos = lseek(fd, pos, SEEK_DATA);
 251                 if (pos == (off_t)-1)
 252                         return errno == ENXIO ? 0 : -2;
 253                 ret = read(fd, buf, sizeof(buf));
 254                 assert(ret); /* eof found by lseek */
 255                 if (ret <= 0)
 256                         return ret;
 257                 if (verbose >= 2)
 258                         fprintf(stderr,
 259                                 "adding to sum at file offset %llu, %d bytes\n",
 260                                 (unsigned long long)pos, ret);
 261                 sum_add_u64(dst, (uint64_t)pos);
 262                 sum_add(dst, buf, ret);
 263                 pos += ret;
 264         }
 265 }
 266
 267 char *
 268 escape(char *in)
 269 {
 270         char *out = alloc(strlen(in) * 3 + 1);
 271         char *src = in;
 272         char *dst = out;
 273
 274         for (; *src; ++src) {
 275                 if (*src >= 32 && *src < 127 && *src != '\\') {
 276                         *dst++ = *src;
 277                 } else {
 278                         sprintf(dst, "\\%02x", (unsigned char)*src);
 279                         dst += 3;
 280                 }
 281         }
 282         *dst = 0;
 283
 284         return out;
 285 }
 286
 287 void
 288 excess_file(const char *fn)
 289 {
 290         printf("only in local fs: %s\n", fn);
 291 }
 292
 293 void
 294 missing_file(const char *fn)
 295 {
 296         printf("only in remote fs: %s\n", fn);
 297 }
 298
 299 int
 300 pathcmp(const char *a, const char *b)
 301 {
 302         int len_a = strlen(a);
 303         int len_b = strlen(b);
 304
 305         /*
 306          * as the containing directory is sent after the files, it has to
 307          * come out bigger in the comparison.
 308          */
 309         if (len_a < len_b && a[len_a - 1] == '/' && strncmp(a, b, len_a) == 0)
 310                 return 1;
 311         if (len_a > len_b && b[len_b - 1] == '/' && strncmp(a, b, len_b) == 0)
 312                 return -1;
 313
 314         return strcmp(a, b);
 315 }
 316
 317 void
 318 check_match(char *fn, char *local_m, char *remote_m,
 319             char *local_c, char *remote_c)
 320 {
 321         int match_m = !strcmp(local_m, remote_m);
 322         int match_c = !strcmp(local_c, remote_c);
 323
 324         if (match_m && !match_c) {
 325                 printf("data mismatch in %s\n", fn);
 326         } else if (!match_m && match_c) {
 327                 printf("metadata mismatch in %s\n", fn);
 328         } else if (!match_m && !match_c) {
 329                 printf("metadata and data mismatch in %s\n", fn);
 330         }
 331 }
 332
 333 char *prev_fn;
 334 char *prev_m;
 335 char *prev_c;
 336 void
 337 check_manifest(char *fn, char *m, char *c, int last_call)
 338 {
 339         char *rem_m;
 340         char *rem_c;
 341         char *l;
 342         int cmp;
 343
 344         if (prev_fn) {
 345                 if (last_call)
 346                         cmp = -1;
 347                 else
 348                         cmp = pathcmp(prev_fn, fn);
 349                 if (cmp > 0) {
 350                         excess_file(fn);
 351                         return;
 352                 } else if (cmp < 0) {
 353                         missing_file(prev_fn);
 354                 } else {
 355                         check_match(fn, m, prev_m, c, prev_c);
 356                 }
 357                 free(prev_fn);
 358                 free(prev_m);
 359                 free(prev_c);
 360                 prev_fn = NULL;
 361                 prev_m = NULL;
 362                 prev_c = NULL;
 363                 if (cmp == 0)
 364                         return;
 365         }
 366         while ((l = getln(line, sizeof(line), in_fp))) {
 367                 rem_c = strrchr(l, ' ');
 368                 if (!rem_c) {
 369                         /* final cs */
 370                         checksum = strdup(l);
 371                         break;
 372                 }
 373                 if (rem_c == l) {
 374 malformed:
 375                         fprintf(stderr, "malformed input\n");
 376                         exit(-1);
 377                 }
 378                 *rem_c++ = 0;
 379                 rem_m = strrchr(l, ' ');
 380                 if (!rem_m)
 381                         goto malformed;
 382                 *rem_m++ = 0;
 383
 384                 if (last_call)
 385                         cmp = -1;
 386                 else
 387                         cmp = pathcmp(l, fn);
 388                 if (cmp == 0) {
 389                         check_match(fn, m, rem_m, c, rem_c);
 390                         return;
 391                 } else if (cmp > 0) {
 392                         excess_file(fn);
 393                         prev_fn = strdup(l);
 394                         prev_m = strdup(rem_m);
 395                         prev_c = strdup(rem_c);
 396                         return;
 397                 }
 398                 missing_file(l);
 399         }
 400         if (!last_call)
 401                 excess_file(fn);
 402 }
 403
 404 int
 405 namecmp(const void *aa, const void *bb)
 406 {
 407         char * const *a = aa;
 408         char * const *b = bb;
 409
 410         return strcmp(*a, *b);
 411 }
 412
 413 void
 414 sum(int dirfd, int level, sum_t *dircs, char *path_prefix, char *path_in)
 415 {
 416         DIR *d;
 417         struct dirent *de;
 418         char **namelist = NULL;
 419         int alloclen = 0;
 420         int entries = 0;
 421         int i;
 422         int ret;
 423         int fd;
 424         int excl;
 425         sum_file_data_t sum_file_data = flags[FLAG_STRUCTURE] ?
 426                         sum_file_data_strict : sum_file_data_permissive;
 427
 428         d = fdopendir(dirfd);
 429         if (!d) {
 430                 perror("opendir");
 431                 exit(-1);
 432         }
 433         while((de = readdir(d))) {
 434                 if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, ".."))
 435                         continue;
 436                 if (entries == alloclen) {
 437                         alloclen += CHUNKS;
 438                         namelist = realloc(namelist,
 439                                            alloclen * sizeof(*namelist));
 440                         if (!namelist) {
 441                                 fprintf(stderr, "malloc failed\n");
 442                                 exit(-1);
 443                         }
 444                 }
 445                 namelist[entries] = strdup(de->d_name);
 446                 if (!namelist[entries]) {
 447                         fprintf(stderr, "malloc failed\n");
 448                         exit(-1);
 449                 }
 450                 ++entries;
 451         }
 452         qsort(namelist, entries, sizeof(*namelist), namecmp);
 453         for (i = 0; i < entries; ++i) {
 454                 struct stat64 st;
 455                 sum_t cs;
 456                 sum_t meta;
 457                 char *path;
 458
 459                 sum_init(&cs);
 460                 sum_init(&meta);
 461                 path = alloc(strlen(path_in) + strlen(namelist[i]) + 3);
 462                 sprintf(path, "%s/%s", path_in, namelist[i]);
 463                 for (excl = 0; excl < n_excludes; ++excl) {
 464                         if (strncmp(excludes[excl].path, path,
 465                             excludes[excl].len) == 0)
 466                                 goto next;
 467                 }
 468
 469                 ret = fchdir(dirfd);
 470                 if (ret == -1) {
 471                         perror("fchdir");
 472                         exit(-1);
 473                 }
 474                 ret = lstat64(namelist[i], &st);
 475                 if (ret) {
 476                         fprintf(stderr, "stat failed for %s/%s: %s\n",
 477                                 path_prefix, path, strerror(errno));
 478                         exit(-1);
 479                 }
 480                 sum_add_u64(&meta, level);
 481                 sum_add(&meta, namelist[i], strlen(namelist[i]));
 482                 if (!S_ISDIR(st.st_mode))
 483                         sum_add_u64(&meta, st.st_nlink);
 484                 if (flags[FLAG_UID])
 485                         sum_add_u64(&meta, st.st_uid);
 486                 if (flags[FLAG_GID])
 487                         sum_add_u64(&meta, st.st_gid);
 488                 if (flags[FLAG_MODE])
 489                         sum_add_u64(&meta, st.st_mode);
 490                 if (flags[FLAG_ATIME])
 491                         sum_add_time(&meta, st.st_atime);
 492                 if (flags[FLAG_MTIME])
 493                         sum_add_time(&meta, st.st_mtime);
 494                 if (flags[FLAG_CTIME])
 495                         sum_add_time(&meta, st.st_ctime);
 496                 if (S_ISDIR(st.st_mode)) {
 497                         fd = openat(dirfd, namelist[i], 0);
 498                         if (fd == -1 && flags[FLAG_OPEN_ERROR]) {
 499                                 sum_add_u64(&meta, errno);
 500                         } else if (fd == -1) {
 501                                 fprintf(stderr, "open failed for %s/%s: %s\n",
 502                                         path_prefix, path, strerror(errno));
 503                                 exit(-1);
 504                         } else {
 505                                 sum(fd, level + 1, &cs, path_prefix, path);
 506                                 close(fd);
 507                         }
 508                 } else if (S_ISREG(st.st_mode)) {
 509                         sum_add_u64(&meta, st.st_size);
 510                         if (flags[FLAG_DATA]) {
 511                                 if (verbose)
 512                                         fprintf(stderr, "file %s\n",
 513                                                 namelist[i]);
 514                                 fd = openat(dirfd, namelist[i], 0);
 515                                 if (fd == -1 && flags[FLAG_OPEN_ERROR]) {
 516                                         sum_add_u64(&meta, errno);
 517                                 } else if (fd == -1) {
 518                                         fprintf(stderr,
 519                                                 "open failed for %s/%s: %s\n",
 520                                                 path_prefix, path,
 521                                                 strerror(errno));
 522                                         exit(-1);
 523                                 }
 524                                 if (fd != -1) {
 525                                         ret = sum_file_data(fd, &cs);
 526                                         if (ret < 0) {
 527                                                 fprintf(stderr,
 528                                                         "read failed for "
 529                                                         "%s/%s: %s\n",
 530                                                         path_prefix, path,
 531                                                         strerror(errno));
 532                                                 exit(-1);
 533                                         }
 534                                         close(fd);
 535                                 }
 536                         }
 537                 } else if (S_ISLNK(st.st_mode)) {
 538                         ret = readlink(namelist[i], buf, sizeof(buf));
 539                         if (ret == -1) {
 540                                 perror("readlink");
 541                                 exit(-1);
 542                         }
 543                         sum_add(&cs, buf, ret);
 544                 } else if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
 545                         sum_add_u64(&cs, major(st.st_rdev));
 546                         sum_add_u64(&cs, minor(st.st_rdev));
 547                 }
 548                 sum_fini(&cs);
 549                 sum_fini(&meta);
 550                 if (gen_manifest || in_manifest) {
 551                         char *fn;
 552                         char *m;
 553                         char *c;
 554
 555                         if (S_ISDIR(st.st_mode))
 556                                 strcat(path, "/");
 557                         fn = escape(path);
 558                         m = sum_to_string(&meta);
 559                         c = sum_to_string(&cs);
 560
 561                         if (gen_manifest)
 562                                 fprintf(out_fp, "%s %s %s\n", fn, m, c);
 563                         if (in_manifest)
 564                                 check_manifest(fn, m, c, 0);
 565                         free(c);
 566                         free(m);
 567                         free(fn);
 568                 }
 569                 sum_add_sum(dircs, &cs);
 570                 sum_add_sum(dircs, &meta);
 571 next:
 572                 free(path);
 573         }
 574 }
 575
 576 int
 577 main(int argc, char *argv[])
 578 {
 579         extern char *optarg;
 580         extern int optind;
 581         int     c;
 582         char *path;
 583         int fd;
 584         sum_t cs;
 585         char flagstring[sizeof(flchar)];
 586         int i;
 587         int plen;
 588         int elen;
 589         int n_flags = 0;
 590         const char *allopts = "heEfuUgGoOaAmMcCdDsSnNw:r:vx:";
 591
 592         out_fp = stdout;
 593         while ((c = getopt(argc, argv, allopts)) != EOF) {
 594                 switch(c) {
 595                 case 'f':
 596                         gen_manifest = 1;
 597                         break;
 598                 case 'u':
 599                 case 'U':
 600                 case 'g':
 601                 case 'G':
 602                 case 'o':
 603                 case 'O':
 604                 case 'a':
 605                 case 'A':
 606                 case 'm':
 607                 case 'M':
 608                 case 'c':
 609                 case 'C':
 610                 case 'd':
 611                 case 'D':
 612                 case 'e':
 613                 case 'E':
 614                 case 's':
 615                 case 'S':
 616                         ++n_flags;
 617                         parse_flag(c);
 618                         break;
 619                 case 'n':
 620                         for (i = 0; i < NUM_FLAGS; ++i)
 621                                 flags[i] = 0;
 622                         break;
 623                 case 'N':
 624                         for (i = 0; i < NUM_FLAGS; ++i)
 625                                 flags[i] = 1;
 626                         break;
 627                 case 'w':
 628                         out_fp = fopen(optarg, "w");
 629                         if (!out_fp) {
 630                                 fprintf(stderr,
 631                                         "failed to open output file: %s\n",
 632                                         strerror(errno));
 633                                 exit(-1);
 634                         }
 635                         break;
 636                 case 'r':
 637                         in_fp = fopen(optarg, "r");
 638                         if (!in_fp) {
 639                                 fprintf(stderr,
 640                                         "failed to open input file: %s\n",
 641                                         strerror(errno));
 642                                 exit(-1);
 643                         }
 644                         break;
 645                 case 'x':
 646                         ++n_excludes;
 647                         excludes = realloc(excludes,
 648                                            sizeof(*excludes) * n_excludes);
 649                         if (!excludes) {
 650                                 fprintf(stderr,
 651                                         "failed to alloc exclude space\n");
 652                                 exit(-1);
 653                         }
 654                         excludes[n_excludes - 1].path = optarg;
 655                         break;
 656                 case 'v':
 657                         ++verbose;
 658                         break;
 659                 case 'h':
 660                 case '?':
 661                         usage();
 662                 }
 663         }
 664
 665         if (optind + 1 != argc) {
 666                 fprintf(stderr, "missing path\n");
 667                 usage();
 668         }
 669
 670         if (in_fp) {
 671                 char *l = getln(line, sizeof(line), in_fp);
 672                 char *p;
 673
 674                 if (l == NULL) {
 675                         fprintf(stderr, "failed to read line from input\n");
 676                         exit(-1);
 677                 }
 678                 if (strncmp(l, "Flags: ", 7) == 0) {
 679                         l += 7;
 680                         in_manifest = 1;
 681                         parse_flags(l);
 682                 } else if ((p = strchr(l, ':'))) {
 683                         *p++ = 0;
 684                         parse_flags(l);
 685                         checksum = strdup(p);
 686                 } else {
 687                         fprintf(stderr, "invalid input file format\n");
 688                         exit(-1);
 689                 }
 690                 if (n_flags)
 691                         fprintf(stderr, "warning: "
 692                                 "command line flags ignored in -r mode\n");
 693         }
 694         strcpy(flagstring, flchar);
 695         for (i = 0; i < NUM_FLAGS; ++i) {
 696                 if (flags[i] == 0)
 697                         flagstring[i] -= 'a' - 'A';
 698         }
 699
 700         path = argv[optind];
 701         plen = strlen(path);
 702         if (path[plen - 1] == '/') {
 703                 --plen;
 704                 path[plen] = '\0';
 705         }
 706
 707         for (i = 0; i < n_excludes; ++i) {
 708                 if (strncmp(path, excludes[i].path, plen) != 0)
 709                         fprintf(stderr,
 710                                 "warning: exclude %s outside of path %s\n",
 711                                 excludes[i].path, path);
 712                 else
 713                         excludes[i].path += plen;
 714                 elen = strlen(excludes[i].path);
 715                 if (excludes[i].path[elen - 1] == '/')
 716                         --elen;
 717                 excludes[i].path[elen] = '\0';
 718                 excludes[i].len = elen;
 719         }
 720
 721         fd = open(path, O_RDONLY);
 722         if (fd == -1) {
 723                 fprintf(stderr, "failed to open %s: %s\n", path,
 724                         strerror(errno));
 725                 exit(-1);
 726         }
 727
 728         if (gen_manifest)
 729                 fprintf(out_fp, "Flags: %s\n", flagstring);
 730
 731         sum_init(&cs);
 732         sum(fd, 1, &cs, path, "");
 733         sum_fini(&cs);
 734
 735         close(fd);
 736         if (in_manifest)
 737                 check_manifest("", "", "", 1);
 738
 739         if (!checksum) {
 740                 if (in_manifest) {
 741                         fprintf(stderr, "malformed input\n");
 742                         exit(-1);
 743                 }
 744                 if (!gen_manifest)
 745                         fprintf(out_fp, "%s:", flagstring);
 746
 747                 fprintf(out_fp, "%s\n", sum_to_string(&cs));
 748         } else {
 749                 if (strcmp(checksum, sum_to_string(&cs)) == 0) {
 750                         printf("OK\n");
 751                         exit(0);
 752                 } else {
 753                         printf("FAIL\n");
 754                         exit(1);
 755                 }
 756         }
 757
 758         exit(0);
 759 }