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 "debugfs.h"
  30
  31 /*
  32  * This function resets the libc getopt() function, which keeps
  33  * internal state.  Bad design!  Stupid libc API designers!  No
  34  * biscuit!
  35  *
  36  * BSD-derived getopt() functions require that optind be reset to 1 in
  37  * order to reset getopt() state.  This used to be generally accepted
  38  * way of resetting getopt().  However, glibc's getopt()
  39  * has additional getopt() state beyond optind, and requires that
  40  * optind be set zero to reset its state.  So the unfortunate state of
  41  * affairs is that BSD-derived versions of getopt() misbehave if
  42  * optind is set to 0 in order to reset getopt(), and glibc's getopt()
  43  * will core dump if optind is set 1 in order to reset getopt().
  44  *
  45  * More modern versions of BSD require that optreset be set to 1 in
  46  * order to reset getopt().   Sigh.  Standards, anyone?
  47  *
  48  * We hide the hair here.
  49  */
  50 void reset_getopt(void)
  51 {
  52 #if defined(__GLIBC__) || defined(__linux__)
  53         optind = 0;
  54 #else
  55         optind = 1;
  56 #endif
  57 #ifdef HAVE_OPTRESET
  58         optreset = 1;           /* Makes BSD getopt happy */
  59 #endif
  60 }
  61
  62 static const char *pager_search_list[] = { "pager", "more", "less", 0 };
  63 static const char *pager_dir_list[] = { "/usr/bin", "/bin", 0 };
  64
  65 static const char *find_pager(char *buf)
  66 {
  67         const char **i, **j;
  68
  69         for (i = pager_search_list; *i; i++) {
  70                 for (j = pager_dir_list; *j; j++) {
  71                         sprintf(buf, "%s/%s", *j, *i);
  72                         if (access(buf, X_OK) == 0)
  73                                 return(buf);
  74                 }
  75         }
  76         return 0;
  77 }
  78
  79 FILE *open_pager(void)
  80 {
  81         FILE *outfile = 0;
  82         const char *pager = getenv("DEBUGFS_PAGER");
  83         char buf[80];
  84
  85         signal(SIGPIPE, SIG_IGN);
  86         if (!isatty(1))
  87                 return stdout;
  88         if (!pager)
  89                 pager = getenv("PAGER");
  90         if (!pager)
  91                 pager = find_pager(buf);
  92         if (!pager ||
  93             (strcmp(pager, "__none__") == 0) ||
  94             ((outfile = popen(pager, "w")) == 0))
  95                 return stdout;
  96         return outfile;
  97 }
  98
  99 void close_pager(FILE *stream)
 100 {
 101         if (stream && stream != stdout) pclose(stream);
 102 }
 103
 104 /*
 105  * This routine is used whenever a command needs to turn a string into
 106  * an inode.
 107  */
 108 ext2_ino_t string_to_inode(char *str)
 109 {
 110         ext2_ino_t      ino;
 111         int             len = strlen(str);
 112         char            *end;
 113         int             retval;
 114
 115         /*
 116          * If the string is of the form <ino>, then treat it as an
 117          * inode number.
 118          */
 119         if ((len > 2) && (str[0] == '<') && (str[len-1] == '>')) {
 120                 ino = strtoul(str+1, &end, 0);
 121                 if (*end=='>')
 122                         return ino;
 123         }
 124
 125         retval = ext2fs_namei(current_fs, root, cwd, str, &ino);
 126         if (retval) {
 127                 com_err(str, retval, 0);
 128                 return 0;
 129         }
 130         return ino;
 131 }
 132
 133 /*
 134  * This routine returns 1 if the filesystem is not open, and prints an
 135  * error message to that effect.
 136  */
 137 int check_fs_open(char *name)
 138 {
 139         if (!current_fs) {
 140                 com_err(name, 0, "Filesystem not open");
 141                 return 1;
 142         }
 143         return 0;
 144 }
 145
 146 /*
 147  * This routine returns 1 if a filesystem is open, and prints an
 148  * error message to that effect.
 149  */
 150 int check_fs_not_open(char *name)
 151 {
 152         if (current_fs) {
 153                 com_err(name, 0,
 154                         "Filesystem %s is still open.  Close it first.\n",
 155                         current_fs->device_name);
 156                 return 1;
 157         }
 158         return 0;
 159 }
 160
 161 /*
 162  * This routine returns 1 if a filesystem is not opened read/write,
 163  * and prints an error message to that effect.
 164  */
 165 int check_fs_read_write(char *name)
 166 {
 167         if (!(current_fs->flags & EXT2_FLAG_RW)) {
 168                 com_err(name, 0, "Filesystem opened read/only");
 169                 return 1;
 170         }
 171         return 0;
 172 }
 173
 174 /*
 175  * This routine returns 1 if a filesystem is doesn't have its inode
 176  * and block bitmaps loaded, and prints an error message to that
 177  * effect.
 178  */
 179 int check_fs_bitmaps(char *name)
 180 {
 181         if (!current_fs->block_map || !current_fs->inode_map) {
 182                 com_err(name, 0, "Filesystem bitmaps not loaded");
 183                 return 1;
 184         }
 185         return 0;
 186 }
 187
 188 /*
 189  * This function takes a __u32 time value and converts it to a string,
 190  * using ctime
 191  */
 192 char *time_to_string(__u32 cl)
 193 {
 194         static int      do_gmt = -1;
 195         time_t          t = (time_t) cl;
 196         const char      *tz;
 197
 198         if (do_gmt == -1) {
 199                 /* The diet libc doesn't respect the TZ environemnt variable */
 200                 tz = getenv("TZ");
 201                 if (!tz)
 202                         tz = "";
 203                 do_gmt = !strcmp(tz, "GMT");
 204         }
 205
 206         return asctime((do_gmt) ? gmtime(&t) : localtime(&t));
 207 }
 208
 209 /*
 210  * Parse a string as a time.  Return ((time_t)-1) if the string
 211  * doesn't appear to be a sane time.
 212  */
 213 extern time_t string_to_time(const char *arg)
 214 {
 215         struct  tm      ts;
 216         time_t          ret;
 217         char *tmp;
 218
 219         if (strcmp(arg, "now") == 0) {
 220                 return time(0);
 221         }
 222         memset(&ts, 0, sizeof(ts));
 223 #ifdef HAVE_STRPTIME
 224         strptime(arg, "%Y%m%d%H%M%S", &ts);
 225 #else
 226         sscanf(arg, "%4d%2d%2d%2d%2d%2d", &ts.tm_year, &ts.tm_mon,
 227                &ts.tm_mday, &ts.tm_hour, &ts.tm_min, &ts.tm_sec);
 228         ts.tm_year -= 1900;
 229         ts.tm_mon -= 1;
 230         if (ts.tm_year < 0 || ts.tm_mon < 0 || ts.tm_mon > 11 ||
 231             ts.tm_mday < 0 || ts.tm_mday > 31 || ts.tm_hour > 23 ||
 232             ts.tm_min > 59 || ts.tm_sec > 61)
 233                 ts.tm_mday = 0;
 234 #endif
 235         ts.tm_isdst = -1;
 236         ret = mktime(&ts);
 237         if (ts.tm_mday == 0 || ret == ((time_t) -1)) {
 238                 /* Try it as an integer... */
 239                 ret = strtoul(arg, &tmp, 0);
 240                 if (*tmp)
 241                         return ((time_t) -1);
 242         }
 243         return ret;
 244 }
 245
 246 /*
 247  * This function will convert a string to an unsigned long, printing
 248  * an error message if it fails, and returning success or failure in err.
 249  */
 250 unsigned long parse_ulong(const char *str, const char *cmd,
 251                           const char *descr, int *err)
 252 {
 253         char            *tmp;
 254         unsigned long   ret;
 255
 256         ret = strtoul(str, &tmp, 0);
 257         if (*tmp == 0) {
 258                 if (err)
 259                         *err = 0;
 260                 return ret;
 261         }
 262         com_err(cmd, 0, "Bad %s - %s", descr, str);
 263         if (err)
 264                 *err = 1;
 265         else
 266                 exit(1);
 267         return 0;
 268 }
 269
 270 /*
 271  * This function will convert a string to an unsigned long long, printing
 272  * an error message if it fails, and returning success or failure in err.
 273  */
 274 unsigned long long parse_ulonglong(const char *str, const char *cmd,
 275                                    const char *descr, int *err)
 276 {
 277         char                    *tmp;
 278         unsigned long long      ret;
 279
 280         ret = strtoull(str, &tmp, 0);
 281         if (*tmp == 0) {
 282                 if (err)
 283                         *err = 0;
 284                 return ret;
 285         }
 286         com_err(cmd, 0, "Bad %s - %s", descr, str);
 287         if (err)
 288                 *err = 1;
 289         else
 290                 exit(1);
 291         return 0;
 292 }
 293
 294 /*
 295  * This function will convert a string to a block number.  It returns
 296  * 0 on success, 1 on failure.
 297  */
 298 int strtoblk(const char *cmd, const char *str, blk64_t *ret)
 299 {
 300         blk_t   blk;
 301         int     err;
 302
 303         blk = parse_ulonglong(str, cmd, "block number", &err);
 304         *ret = blk;
 305         if (err)
 306                 com_err(cmd, 0, "Invalid block number: %s", str);
 307         return err;
 308 }
 309
 310 /*
 311  * This is a common helper function used by the command processing
 312  * routines
 313  */
 314 int common_args_process(int argc, char *argv[], int min_argc, int max_argc,
 315                         const char *cmd, const char *usage, int flags)
 316 {
 317         if (argc < min_argc || argc > max_argc) {
 318                 com_err(argv[0], 0, "Usage: %s %s", cmd, usage);
 319                 return 1;
 320         }
 321         if (flags & CHECK_FS_NOTOPEN) {
 322                 if (check_fs_not_open(argv[0]))
 323                         return 1;
 324         } else {
 325                 if (check_fs_open(argv[0]))
 326                         return 1;
 327         }
 328         if ((flags & CHECK_FS_RW) && check_fs_read_write(argv[0]))
 329                 return 1;
 330         if ((flags & CHECK_FS_BITMAPS) && check_fs_bitmaps(argv[0]))
 331                 return 1;
 332         return 0;
 333 }
 334
 335 /*
 336  * This is a helper function used by do_stat, do_freei, do_seti, and
 337  * do_testi, etc.  Basically, any command which takes a single
 338  * argument which is a file/inode number specifier.
 339  */
 340 int common_inode_args_process(int argc, char *argv[],
 341                               ext2_ino_t *inode, int flags)
 342 {
 343         if (common_args_process(argc, argv, 2, 2, argv[0], "<file>", flags))
 344                 return 1;
 345
 346         *inode = string_to_inode(argv[1]);
 347         if (!*inode)
 348                 return 1;
 349         return 0;
 350 }
 351
 352 /*
 353  * This is a helper function used by do_freeb, do_setb, and do_testb
 354  */
 355 int common_block_args_process(int argc, char *argv[],
 356                               blk64_t *block, blk64_t *count)
 357 {
 358         int     err;
 359
 360         if (common_args_process(argc, argv, 2, 3, argv[0],
 361                                 "<block> [count]", CHECK_FS_BITMAPS))
 362                 return 1;
 363
 364         if (strtoblk(argv[0], argv[1], block))
 365                 return 1;
 366         if (*block == 0) {
 367                 com_err(argv[0], 0, "Invalid block number 0");
 368                 err = 1;
 369         }
 370
 371         if (argc > 2) {
 372                 *count = parse_ulong(argv[2], argv[0], "count", &err);
 373                 if (err)
 374                         return 1;
 375         }
 376         return 0;
 377 }
 378
 379 int debugfs_read_inode_full(ext2_ino_t ino, struct ext2_inode * inode,
 380                         const char *cmd, int bufsize)
 381 {
 382         int retval;
 383
 384         retval = ext2fs_read_inode_full(current_fs, ino, inode, bufsize);
 385         if (retval) {
 386                 com_err(cmd, retval, "while reading inode %u", ino);
 387                 return 1;
 388         }
 389         return 0;
 390 }
 391
 392 int debugfs_read_inode(ext2_ino_t ino, struct ext2_inode * inode,
 393                         const char *cmd)
 394 {
 395         int retval;
 396
 397         retval = ext2fs_read_inode(current_fs, ino, inode);
 398         if (retval) {
 399                 com_err(cmd, retval, "while reading inode %u", ino);
 400                 return 1;
 401         }
 402         return 0;
 403 }
 404
 405 int debugfs_write_inode_full(ext2_ino_t ino,
 406                              struct ext2_inode *inode,
 407                              const char *cmd,
 408                              int bufsize)
 409 {
 410         int retval;
 411
 412         retval = ext2fs_write_inode_full(current_fs, ino,
 413                                          inode, bufsize);
 414         if (retval) {
 415                 com_err(cmd, retval, "while writing inode %u", ino);
 416                 return 1;
 417         }
 418         return 0;
 419 }
 420
 421 int debugfs_write_inode(ext2_ino_t ino, struct ext2_inode * inode,
 422                         const char *cmd)
 423 {
 424         int retval;
 425
 426         retval = ext2fs_write_inode(current_fs, ino, inode);
 427         if (retval) {
 428                 com_err(cmd, retval, "while writing inode %u", ino);
 429                 return 1;
 430         }
 431         return 0;
 432 }
 433
 434 int debugfs_write_new_inode(ext2_ino_t ino, struct ext2_inode * inode,
 435                             const char *cmd)
 436 {
 437         int retval;
 438
 439         retval = ext2fs_write_new_inode(current_fs, ino, inode);
 440         if (retval) {
 441                 com_err(cmd, retval, "while creating inode %u", ino);
 442                 return 1;
 443         }
 444         return 0;
 445 }