debugfs/util.c

   1 /*
   2  * util.c --- utilities for the debugfs program
   3  *
   4  * Copyright (C) 1993, 1994 Theodore Ts'o.  This file may be
   5  * redistributed under the terms of the GNU Public License.
   6  *
   7  */
   8
   9 #define _XOPEN_SOURCE 600 /* needed for strptime */
  10
  11 #include "config.h"
  12 #include <stdio.h>
  13 #include <unistd.h>
  14 #include <stdlib.h>
  15 #include <ctype.h>
  16 #include <string.h>
  17 #include <time.h>
  18 #include <signal.h>
  19 #ifdef HAVE_GETOPT_H
  20 #include <getopt.h>
  21 #else
  22 extern int optind;
  23 extern char *optarg;
  24 #endif
  25 #ifdef HAVE_OPTRESET
  26 extern int optreset;            /* defined by BSD, but not others */
  27 #endif
  28
  29 #include "ss/ss.h"
  30 #include "debugfs.h"
  31
  32 /*
  33  * This function resets the libc getopt() function, which keeps
  34  * internal state.  Bad design!  Stupid libc API designers!  No
  35  * biscuit!
  36  *
  37  * BSD-derived getopt() functions require that optind be reset to 1 in
  38  * order to reset getopt() state.  This used to be generally accepted
  39  * way of resetting getopt().  However, glibc's getopt()
  40  * has additional getopt() state beyond optind, and requires that
  41  * optind be set zero to reset its state.  So the unfortunate state of
  42  * affairs is that BSD-derived versions of getopt() misbehave if
  43  * optind is set to 0 in order to reset getopt(), and glibc's getopt()
  44  * will core dump if optind is set 1 in order to reset getopt().
  45  *
  46  * More modern versions of BSD require that optreset be set to 1 in
  47  * order to reset getopt().   Sigh.  Standards, anyone?
  48  *
  49  * We hide the hair here.
  50  */
  51 void reset_getopt(void)
  52 {
  53 #if defined(__GLIBC__) || defined(__linux__)
  54         optind = 0;
  55 #else
  56         optind = 1;
  57 #endif
  58 #ifdef HAVE_OPTRESET
  59         optreset = 1;           /* Makes BSD getopt happy */
  60 #endif
  61 }
  62
  63 static const char *pager_search_list[] = { "pager", "more", "less", 0 };
  64 static const char *pager_dir_list[] = { "/usr/bin", "/bin", 0 };
  65
  66 static const char *find_pager(char *buf)
  67 {
  68         const char **i, **j;
  69
  70         for (i = pager_search_list; *i; i++) {
  71                 for (j = pager_dir_list; *j; j++) {
  72                         sprintf(buf, "%s/%s", *j, *i);
  73                         if (access(buf, X_OK) == 0)
  74                                 return(buf);
  75                 }
  76         }
  77         return 0;
  78 }
  79
  80 FILE *open_pager(void)
  81 {
  82         FILE *outfile = 0;
  83         const char *pager = ss_safe_getenv("DEBUGFS_PAGER");
  84         char buf[80];
  85
  86         signal(SIGPIPE, SIG_IGN);
  87         if (!isatty(1))
  88                 return stdout;
  89         if (!pager)
  90                 pager = ss_safe_getenv("PAGER");
  91         if (!pager)
  92                 pager = find_pager(buf);
  93         if (!pager ||
  94             (strcmp(pager, "__none__") == 0) ||
  95             ((outfile = popen(pager, "w")) == 0))
  96                 return stdout;
  97         return outfile;
  98 }
  99
 100 void close_pager(FILE *stream)
 101 {
 102         if (stream && stream != stdout) pclose(stream);
 103 }
 104
 105 /*
 106  * This routine is used whenever a command needs to turn a string into
 107  * an inode.
 108  */
 109 ext2_ino_t string_to_inode(char *str)
 110 {
 111         ext2_ino_t      ino;
 112         int             len = strlen(str);
 113         char            *end;
 114         int             retval;
 115
 116         /*
 117          * If the string is of the form <ino>, then treat it as an
 118          * inode number.
 119          */
 120         if ((len > 2) && (str[0] == '<') && (str[len-1] == '>')) {
 121                 ino = strtoul(str+1, &end, 0);
 122                 if (*end=='>' && (ino <= current_fs->super->s_inodes_count))
 123                         return ino;
 124         }
 125
 126         retval = ext2fs_namei(current_fs, root, cwd, str, &ino);
 127         if (retval) {
 128                 com_err(str, retval, 0);
 129                 return 0;
 130         }
 131         if (ino > current_fs->super->s_inodes_count) {
 132                 com_err(str, 0, "resolves to an illegal inode number: %u\n",
 133                         ino);
 134                 return 0;
 135         }
 136         return ino;
 137 }
 138
 139 /*
 140  * This routine returns 1 if the filesystem is not open, and prints an
 141  * error message to that effect.
 142  */
 143 int check_fs_open(char *name)
 144 {
 145         if (!current_fs) {
 146                 com_err(name, 0, "Filesystem not open");
 147                 return 1;
 148         }
 149         return 0;
 150 }
 151
 152 /*
 153  * This routine returns 1 if a filesystem is open, and prints an
 154  * error message to that effect.
 155  */
 156 int check_fs_not_open(char *name)
 157 {
 158         if (current_fs) {
 159                 com_err(name, 0,
 160                         "Filesystem %s is still open.  Close it first.\n",
 161                         current_fs->device_name);
 162                 return 1;
 163         }
 164         return 0;
 165 }
 166
 167 /*
 168  * This routine returns 1 if a filesystem is not opened read/write,
 169  * and prints an error message to that effect.
 170  */
 171 int check_fs_read_write(char *name)
 172 {
 173         if (!(current_fs->flags & EXT2_FLAG_RW)) {
 174                 com_err(name, 0, "Filesystem opened read/only");
 175                 return 1;
 176         }
 177         return 0;
 178 }
 179
 180 /*
 181  * This routine returns 1 if a filesystem is doesn't have its inode
 182  * and block bitmaps loaded, and prints an error message to that
 183  * effect.
 184  */
 185 int check_fs_bitmaps(char *name)
 186 {
 187         if (!current_fs->block_map || !current_fs->inode_map) {
 188                 com_err(name, 0, "Filesystem bitmaps not loaded");
 189                 return 1;
 190         }
 191         return 0;
 192 }
 193
 194 char *inode_time_to_string(__u32 xtime, __u32 xtime_extra)
 195 {
 196         __s64 t = (__s32) xtime;
 197
 198         t += (__s64) (xtime_extra & EXT4_EPOCH_MASK) << 32;
 199         return time_to_string(t);
 200 }
 201
 202 /*
 203  * This function takes a __s64 time value and converts it to a string,
 204  * using ctime
 205  */
 206 char *time_to_string(__s64 cl)
 207 {
 208         static int      do_gmt = -1;
 209         time_t          t = (time_t) cl;
 210         const char      *tz;
 211
 212         if (do_gmt == -1) {
 213                 /* The diet libc doesn't respect the TZ environment variable */
 214                 tz = ss_safe_getenv("TZ");
 215                 if (!tz)
 216                         tz = "";
 217                 do_gmt = !strcmp(tz, "GMT") || !strcmp(tz, "GMT0");
 218         }
 219
 220         return asctime((do_gmt) ? gmtime(&t) : localtime(&t));
 221 }
 222
 223 /*
 224  * Parse a string as a time.  Return ((time_t)-1) if the string
 225  * doesn't appear to be a sane time.
 226  */
 227 extern __s64 string_to_time(const char *arg)
 228 {
 229         struct  tm      ts;
 230         __s64           ret;
 231         char *tmp;
 232
 233         if (strcmp(arg, "now") == 0) {
 234                 return time(0);
 235         }
 236         if (arg[0] == '@') {
 237                 /* interpret it as an integer */
 238                 arg++;
 239         fallback:
 240                 ret = strtoll(arg, &tmp, 0);
 241                 if (*tmp)
 242                         return -1;
 243                 return ret;
 244         }
 245         memset(&ts, 0, sizeof(ts));
 246 #ifdef HAVE_STRPTIME
 247         tmp = strptime(arg, "%Y%m%d%H%M%S", &ts);
 248         if (tmp == NULL)
 249                 tmp = strptime(arg, "%Y%m%d%H%M", &ts);
 250         if (tmp == NULL)
 251                 tmp = strptime(arg, "%Y%m%d", &ts);
 252         if (tmp == NULL)
 253                 goto fallback;
 254 #else
 255         sscanf(arg, "%4d%2d%2d%2d%2d%2d", &ts.tm_year, &ts.tm_mon,
 256                &ts.tm_mday, &ts.tm_hour, &ts.tm_min, &ts.tm_sec);
 257         ts.tm_year -= 1900;
 258         ts.tm_mon -= 1;
 259         if (ts.tm_year < 0 || ts.tm_mon < 0 || ts.tm_mon > 11 ||
 260             ts.tm_mday <= 0 || ts.tm_mday > 31 || ts.tm_hour > 23 ||
 261             ts.tm_min > 59 || ts.tm_sec > 61)
 262                 goto fallback;
 263 #endif
 264         ts.tm_isdst = -1;
 265         /* strptime() may only update the specified fields, which does not
 266          * necessarily include ts.tm_yday (%j).  Calculate this if unset:
 267          *
 268          * Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
 269          * 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
 270          *
 271          * Start with 31 days per month.  Even months have only 30 days, but
 272          * reverse in August, subtract one day for those months. February has
 273          * only 28 days, not 30, subtract two days. Add day of month, minus
 274          * one, since day is not finished yet.  Leap years handled afterward. */
 275         if (ts.tm_yday == 0)
 276                 ts.tm_yday = (ts.tm_mon * 31) -
 277                         ((ts.tm_mon - (ts.tm_mon > 7)) / 2) -
 278                         2 * (ts.tm_mon > 1) + ts.tm_mday - 1;
 279         ret = ts.tm_sec + ts.tm_min*60 + ts.tm_hour*3600 + ts.tm_yday*86400 +
 280                 ((__s64) ts.tm_year-70)*31536000 +
 281                 (((__s64) ts.tm_year-69)/4)*86400 -
 282                 (((__s64) ts.tm_year-1)/100)*86400 +
 283                 (((__s64) ts.tm_year+299)/400)*86400;
 284         return ret;
 285 }
 286
 287 /*
 288  * This function will convert a string to an unsigned long, printing
 289  * an error message if it fails, and returning success or failure in err.
 290  */
 291 unsigned long parse_ulong(const char *str, const char *cmd,
 292                           const char *descr, int *err)
 293 {
 294         char            *tmp;
 295         unsigned long   ret;
 296
 297         ret = strtoul(str, &tmp, 0);
 298         if (*tmp == 0) {
 299                 if (err)
 300                         *err = 0;
 301                 return ret;
 302         }
 303         com_err(cmd, 0, "Bad %s - %s", descr, str);
 304         if (err)
 305                 *err = 1;
 306         else
 307                 exit(1);
 308         return 0;
 309 }
 310
 311 /*
 312  * This function will convert a string to an unsigned long long, printing
 313  * an error message if it fails, and returning success or failure in err.
 314  */
 315 unsigned long long parse_ulonglong(const char *str, const char *cmd,
 316                                    const char *descr, int *err)
 317 {
 318         char                    *tmp;
 319         unsigned long long      ret;
 320
 321         ret = strtoull(str, &tmp, 0);
 322         if (*tmp == 0) {
 323                 if (err)
 324                         *err = 0;
 325                 return ret;
 326         }
 327         com_err(cmd, 0, "Bad %s - %s", descr, str);
 328         if (err)
 329                 *err = 1;
 330         else
 331                 exit(1);
 332         return 0;
 333 }
 334
 335 /*
 336  * This function will convert a string to a block number.  It returns
 337  * 0 on success, 1 on failure.  On failure, it outputs either an optionally
 338  * specified error message or a default.
 339  */
 340 int strtoblk(const char *cmd, const char *str, const char *errmsg,
 341              blk64_t *ret)
 342 {
 343         blk64_t blk;
 344         int     err;
 345
 346         if (errmsg == NULL)
 347                 blk = parse_ulonglong(str, cmd, "block number", &err);
 348         else
 349                 blk = parse_ulonglong(str, cmd, errmsg, &err);
 350         *ret = blk;
 351         return err;
 352 }
 353
 354 /*
 355  * This is a common helper function used by the command processing
 356  * routines
 357  */
 358 int common_args_process(int argc, char *argv[], int min_argc, int max_argc,
 359                         const char *cmd, const char *usage, int flags)
 360 {
 361         if (argc < min_argc || argc > max_argc) {
 362                 com_err(argv[0], 0, "Usage: %s %s", cmd, usage);
 363                 return 1;
 364         }
 365         if (flags & CHECK_FS_NOTOPEN) {
 366                 if (check_fs_not_open(argv[0]))
 367                         return 1;
 368         } else {
 369                 if (check_fs_open(argv[0]))
 370                         return 1;
 371         }
 372         if ((flags & CHECK_FS_RW) && check_fs_read_write(argv[0]))
 373                 return 1;
 374         if ((flags & CHECK_FS_BITMAPS) && check_fs_bitmaps(argv[0]))
 375                 return 1;
 376         return 0;
 377 }
 378
 379 /*
 380  * This is a helper function used by do_stat, do_freei, do_seti, and
 381  * do_testi, etc.  Basically, any command which takes a single
 382  * argument which is a file/inode number specifier.
 383  */
 384 int common_inode_args_process(int argc, char *argv[],
 385                               ext2_ino_t *inode, int flags)
 386 {
 387         if (common_args_process(argc, argv, 2, 2, argv[0], "<file>", flags))
 388                 return 1;
 389
 390         *inode = string_to_inode(argv[1]);
 391         if (!*inode)
 392                 return 1;
 393         return 0;
 394 }
 395
 396 /*
 397  * This is a helper function used by do_freeb, do_setb, and do_testb
 398  */
 399 int common_block_args_process(int argc, char *argv[],
 400                               blk64_t *block, blk64_t *count)
 401 {
 402         int     err;
 403
 404         if (common_args_process(argc, argv, 2, 3, argv[0],
 405                                 "<block> [count]", CHECK_FS_BITMAPS))
 406                 return 1;
 407
 408         if (strtoblk(argv[0], argv[1], NULL, block))
 409                 return 1;
 410         if (*block == 0) {
 411                 com_err(argv[0], 0, "Invalid block number 0");
 412                 return 1;
 413         }
 414
 415         if (argc > 2) {
 416                 err = strtoblk(argv[0], argv[2], "count", count);
 417                 if (err)
 418                         return 1;
 419         }
 420         return 0;
 421 }
 422
 423 int debugfs_read_inode2(ext2_ino_t ino, struct ext2_inode * inode,
 424                         const char *cmd, int bufsize, int flags)
 425 {
 426         int retval;
 427
 428         retval = ext2fs_read_inode2(current_fs, ino, inode, bufsize, flags);
 429         if (retval) {
 430                 com_err(cmd, retval, "while reading inode %u", ino);
 431                 return 1;
 432         }
 433         return 0;
 434 }
 435
 436 int debugfs_read_inode(ext2_ino_t ino, struct ext2_inode * inode,
 437                         const char *cmd)
 438 {
 439         int retval;
 440
 441         retval = ext2fs_read_inode(current_fs, ino, inode);
 442         if (retval) {
 443                 com_err(cmd, retval, "while reading inode %u", ino);
 444                 return 1;
 445         }
 446         return 0;
 447 }
 448
 449 int debugfs_write_inode2(ext2_ino_t ino,
 450                          struct ext2_inode *inode,
 451                          const char *cmd,
 452                          int bufsize, int flags)
 453 {
 454         int retval;
 455
 456         retval = ext2fs_write_inode2(current_fs, ino, inode, bufsize, flags);
 457         if (retval) {
 458                 com_err(cmd, retval, "while writing inode %u", ino);
 459                 return 1;
 460         }
 461         return 0;
 462 }
 463
 464 int debugfs_write_inode(ext2_ino_t ino, struct ext2_inode * inode,
 465                         const char *cmd)
 466 {
 467         int retval;
 468
 469         retval = ext2fs_write_inode(current_fs, ino, inode);
 470         if (retval) {
 471                 com_err(cmd, retval, "while writing inode %u", ino);
 472                 return 1;
 473         }
 474         return 0;
 475 }
 476
 477 int debugfs_write_new_inode(ext2_ino_t ino, struct ext2_inode * inode,
 478                             const char *cmd)
 479 {
 480         int retval;
 481
 482         retval = ext2fs_write_new_inode(current_fs, ino, inode);
 483         if (retval) {
 484                 com_err(cmd, retval, "while creating inode %u", ino);
 485                 return 1;
 486         }
 487         return 0;
 488 }
 489
 490 /*
 491  * Given a mode, return the ext2 file type
 492  */
 493 int ext2_file_type(unsigned int mode)
 494 {
 495         if (LINUX_S_ISREG(mode))
 496                 return EXT2_FT_REG_FILE;
 497
 498         if (LINUX_S_ISDIR(mode))
 499                 return EXT2_FT_DIR;
 500
 501         if (LINUX_S_ISCHR(mode))
 502                 return EXT2_FT_CHRDEV;
 503
 504         if (LINUX_S_ISBLK(mode))
 505                 return EXT2_FT_BLKDEV;
 506
 507         if (LINUX_S_ISLNK(mode))
 508                 return EXT2_FT_SYMLINK;
 509
 510         if (LINUX_S_ISFIFO(mode))
 511                 return EXT2_FT_FIFO;
 512
 513         if (LINUX_S_ISSOCK(mode))
 514                 return EXT2_FT_SOCK;
 515
 516         return 0;
 517 }
 518
 519 errcode_t read_list(char *str, blk64_t **list, size_t *len)
 520 {
 521         blk64_t *lst = *list;
 522         size_t ln = *len;
 523         char *tok, *p = str;
 524         errcode_t retval;
 525
 526         while ((tok = strtok(p, ","))) {
 527                 blk64_t *l;
 528                 blk64_t x, y;
 529                 char *e;
 530
 531                 errno = 0;
 532                 y = x = strtoull(tok, &e, 0);
 533                 if (errno)
 534                         return errno;
 535                 if (*e == '-') {
 536                         y = strtoull(e + 1, NULL, 0);
 537                         if (errno)
 538                                 return errno;
 539                 } else if (*e != 0) {
 540                         retval = EINVAL;
 541                         goto err;
 542                 }
 543                 if (y < x) {
 544                         retval = EINVAL;
 545                         goto err;
 546                 }
 547                 l = realloc(lst, sizeof(blk64_t) * (ln + y - x + 1));
 548                 if (l == NULL) {
 549                         retval = ENOMEM;
 550                         goto err;
 551                 }
 552                 lst = l;
 553                 for (; x <= y; x++)
 554                         lst[ln++] = x;
 555                 p = NULL;
 556         }
 557
 558         *list = lst;
 559         *len = ln;
 560         return 0;
 561 err:
 562         free(lst);
 563         return retval;
 564 }