binutils/bucomm.c

   1 /* bucomm.c -- Bin Utils COMmon code.
   2    Copyright (C) 1991-2022 Free Software Foundation, Inc.
   3
   4    This file is part of GNU Binutils.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
  19    02110-1301, USA.  */
  20 \f
  21 /* We might put this in a library someday so it could be dynamically
  22    loaded, but for now it's not necessary.  */
  23
  24 #include "sysdep.h"
  25 #include "bfd.h"
  26 #include "libiberty.h"
  27 #include "filenames.h"
  28 #include <time.h>
  29 #include <assert.h>
  30 #include "bucomm.h"
  31 \f
  32 /* Error reporting.  */
  33
  34 char *program_name;
  35
  36 void
  37 bfd_nonfatal (const char *string)
  38 {
  39   const char *errmsg;
  40   enum bfd_error err = bfd_get_error ();
  41
  42   if (err == bfd_error_no_error)
  43     errmsg = _("cause of error unknown");
  44   else
  45     errmsg = bfd_errmsg (err);
  46   fflush (stdout);
  47   if (string)
  48     fprintf (stderr, "%s: %s: %s\n", program_name, string, errmsg);
  49   else
  50     fprintf (stderr, "%s: %s\n", program_name, errmsg);
  51 }
  52
  53 /* Issue a non fatal error message.  FILENAME, or if NULL then BFD,
  54    are used to indicate the problematic file.  SECTION, if non NULL,
  55    is used to provide a section name.  If FORMAT is non-null, then it
  56    is used to print additional information via vfprintf.  Finally the
  57    bfd error message is printed.  In summary, error messages are of
  58    one of the following forms:
  59
  60    PROGRAM: file: bfd-error-message
  61    PROGRAM: file[section]: bfd-error-message
  62    PROGRAM: file: printf-message: bfd-error-message
  63    PROGRAM: file[section]: printf-message: bfd-error-message.  */
  64
  65 void
  66 bfd_nonfatal_message (const char *filename,
  67                       const bfd *abfd,
  68                       const asection *section,
  69                       const char *format, ...)
  70 {
  71   const char *errmsg;
  72   const char *section_name;
  73   enum bfd_error err = bfd_get_error ();
  74
  75   if (err == bfd_error_no_error)
  76     errmsg = _("cause of error unknown");
  77   else
  78     errmsg = bfd_errmsg (err);
  79   fflush (stdout);
  80   section_name = NULL;
  81   fprintf (stderr, "%s", program_name);
  82
  83   if (abfd)
  84     {
  85       if (!filename)
  86         filename = bfd_get_archive_filename (abfd);
  87       if (section)
  88         section_name = bfd_section_name (section);
  89     }
  90   if (section_name)
  91     fprintf (stderr, ": %s[%s]", filename, section_name);
  92   else
  93     fprintf (stderr, ": %s", filename);
  94
  95   if (format)
  96     {
  97       va_list args;
  98       va_start (args, format);
  99       fprintf (stderr, ": ");
 100       vfprintf (stderr, format, args);
 101       va_end (args);
 102     }
 103   fprintf (stderr, ": %s\n", errmsg);
 104 }
 105
 106 void
 107 bfd_fatal (const char *string)
 108 {
 109   bfd_nonfatal (string);
 110   xexit (1);
 111 }
 112
 113 void
 114 report (const char * format, va_list args)
 115 {
 116   fflush (stdout);
 117   fprintf (stderr, "%s: ", program_name);
 118   vfprintf (stderr, format, args);
 119   putc ('\n', stderr);
 120 }
 121
 122 void
 123 fatal (const char *format, ...)
 124 {
 125   va_list args;
 126
 127   va_start (args, format);
 128
 129   report (format, args);
 130   va_end (args);
 131   xexit (1);
 132 }
 133
 134 void
 135 non_fatal (const char *format, ...)
 136 {
 137   va_list args;
 138
 139   va_start (args, format);
 140
 141   report (format, args);
 142   va_end (args);
 143 }
 144
 145 /* Like xmalloc except that ABFD's objalloc memory is returned.
 146    Use objalloc_free_block to free this memory and all more recently
 147    allocated, or more usually, leave it to bfd_close to free.  */
 148
 149 void *
 150 bfd_xalloc (bfd *abfd, size_t size)
 151 {
 152   void *ret = bfd_alloc (abfd, size);
 153   if (ret == NULL)
 154     bfd_fatal (NULL);
 155   return ret;
 156 }
 157
 158 /* Set the default BFD target based on the configured target.  Doing
 159    this permits the binutils to be configured for a particular target,
 160    and linked against a shared BFD library which was configured for a
 161    different target.  */
 162
 163 void
 164 set_default_bfd_target (void)
 165 {
 166   /* The macro TARGET is defined by Makefile.  */
 167   const char *target = TARGET;
 168
 169   if (! bfd_set_default_target (target))
 170     fatal (_("can't set BFD default target to `%s': %s"),
 171            target, bfd_errmsg (bfd_get_error ()));
 172 }
 173
 174 /* After a FALSE return from bfd_check_format_matches with
 175    bfd_get_error () == bfd_error_file_ambiguously_recognized, print
 176    the possible matching targets and free the list of targets.  */
 177
 178 void
 179 list_matching_formats (char **matching)
 180 {
 181   fflush (stdout);
 182   fprintf (stderr, _("%s: Matching formats:"), program_name);
 183   char **p = matching;
 184   while (*p)
 185     fprintf (stderr, " %s", *p++);
 186   free (matching);
 187   fputc ('\n', stderr);
 188 }
 189
 190 /* List the supported targets.  */
 191
 192 void
 193 list_supported_targets (const char *name, FILE *f)
 194 {
 195   int t;
 196   const char **targ_names;
 197
 198   if (name == NULL)
 199     fprintf (f, _("Supported targets:"));
 200   else
 201     fprintf (f, _("%s: supported targets:"), name);
 202
 203   targ_names = bfd_target_list ();
 204   for (t = 0; targ_names[t] != NULL; t++)
 205     fprintf (f, " %s", targ_names[t]);
 206   fprintf (f, "\n");
 207   free (targ_names);
 208 }
 209
 210 /* List the supported architectures.  */
 211
 212 void
 213 list_supported_architectures (const char *name, FILE *f)
 214 {
 215   const char ** arch;
 216   const char ** arches;
 217
 218   if (name == NULL)
 219     fprintf (f, _("Supported architectures:"));
 220   else
 221     fprintf (f, _("%s: supported architectures:"), name);
 222
 223   for (arch = arches = bfd_arch_list (); *arch; arch++)
 224     fprintf (f, " %s", *arch);
 225   fprintf (f, "\n");
 226   free (arches);
 227 }
 228 \f
 229 static const char *
 230 endian_string (enum bfd_endian endian)
 231 {
 232   switch (endian)
 233     {
 234     case BFD_ENDIAN_BIG: return _("big endian");
 235     case BFD_ENDIAN_LITTLE: return _("little endian");
 236     default: return _("endianness unknown");
 237     }
 238 }
 239
 240 /* Data passed to do_display_target and other target iterators.  */
 241
 242 struct display_target {
 243   /* Temp file.  */
 244   char *filename;
 245   /* Return status.  */
 246   int error;
 247   /* Number of targets.  */
 248   int count;
 249   /* Size of info in bytes.  */
 250   size_t alloc;
 251   /* Per-target info.  */
 252   struct {
 253     /* Target name.  */
 254     const char *name;
 255     /* Non-zero if target/arch combination supported.  */
 256     unsigned char arch[bfd_arch_last - bfd_arch_obscure - 1];
 257   } *info;
 258 };
 259
 260 /* List the targets that BFD is configured to support, each followed
 261    by its endianness and the architectures it supports.  Also build
 262    info about target/archs.  */
 263
 264 static int
 265 do_display_target (const bfd_target *targ, void *data)
 266 {
 267   struct display_target *param = (struct display_target *) data;
 268   bfd *abfd;
 269   size_t amt;
 270
 271   param->count += 1;
 272   amt = param->count * sizeof (*param->info);
 273   if (param->alloc < amt)
 274     {
 275       size_t size = ((param->count < 64 ? 64 : param->count)
 276                      * sizeof (*param->info) * 2);
 277       param->info = xrealloc (param->info, size);
 278       memset ((char *) param->info + param->alloc, 0, size - param->alloc);
 279       param->alloc = size;
 280     }
 281   param->info[param->count - 1].name = targ->name;
 282
 283   printf (_("%s\n (header %s, data %s)\n"), targ->name,
 284           endian_string (targ->header_byteorder),
 285           endian_string (targ->byteorder));
 286
 287   abfd = bfd_openw (param->filename, targ->name);
 288   if (abfd == NULL)
 289     {
 290       bfd_nonfatal (param->filename);
 291       param->error = 1;
 292     }
 293   else if (!bfd_set_format (abfd, bfd_object))
 294     {
 295       if (bfd_get_error () != bfd_error_invalid_operation)
 296         {
 297           bfd_nonfatal (targ->name);
 298           param->error = 1;
 299         }
 300     }
 301   else
 302     {
 303       enum bfd_architecture a;
 304
 305       for (a = bfd_arch_obscure + 1; a < bfd_arch_last; a++)
 306         if (bfd_set_arch_mach (abfd, a, 0))
 307           {
 308             printf ("  %s\n", bfd_printable_arch_mach (a, 0));
 309             param->info[param->count - 1].arch[a - bfd_arch_obscure - 1] = 1;
 310           }
 311     }
 312   if (abfd != NULL)
 313     bfd_close_all_done (abfd);
 314
 315   return param->error;
 316 }
 317
 318 static void
 319 display_target_list (struct display_target *arg)
 320 {
 321   arg->filename = make_temp_file (NULL);
 322   arg->error = 0;
 323   arg->count = 0;
 324   arg->alloc = 0;
 325   arg->info = NULL;
 326
 327   bfd_iterate_over_targets (do_display_target, arg);
 328
 329   unlink (arg->filename);
 330   free (arg->filename);
 331 }
 332
 333 /* Calculate how many targets we can print across the page.  */
 334
 335 static int
 336 do_info_size (int targ, int width, const struct display_target *arg)
 337 {
 338   while (targ < arg->count)
 339     {
 340       width -= strlen (arg->info[targ].name) + 1;
 341       if (width < 0)
 342         return targ;
 343       ++targ;
 344     }
 345   return targ;
 346 }
 347
 348 /* Print header of target names.  */
 349
 350 static void
 351 do_info_header (int targ, int stop_targ, const struct display_target *arg)
 352 {
 353   while (targ != stop_targ)
 354     printf ("%s ", arg->info[targ++].name);
 355 }
 356
 357 /* Print a table row.  */
 358
 359 static void
 360 do_info_row (int targ, int stop_targ, enum bfd_architecture a,
 361              const struct display_target *arg)
 362 {
 363   while (targ != stop_targ)
 364     {
 365       if (arg->info[targ].arch[a - bfd_arch_obscure - 1])
 366         fputs (arg->info[targ].name, stdout);
 367       else
 368         {
 369           int l = strlen (arg->info[targ].name);
 370           while (l--)
 371             putchar ('-');
 372         }
 373       ++targ;
 374       if (targ != stop_targ)
 375         putchar (' ');
 376     }
 377 }
 378
 379 /* Print tables of all the target-architecture combinations that
 380    BFD has been configured to support.  */
 381
 382 static void
 383 display_target_tables (const struct display_target *arg)
 384 {
 385   const char *columns;
 386   int width, start_targ, stop_targ;
 387   enum bfd_architecture arch;
 388   int longest_arch = 0;
 389
 390   for (arch = bfd_arch_obscure + 1; arch < bfd_arch_last; arch++)
 391     {
 392       const char *s = bfd_printable_arch_mach (arch, 0);
 393       int len = strlen (s);
 394       if (len > longest_arch)
 395         longest_arch = len;
 396     }
 397
 398   width = 0;
 399   columns = getenv ("COLUMNS");
 400   if (columns != NULL)
 401     width = atoi (columns);
 402   if (width == 0)
 403     width = 80;
 404
 405   for (start_targ = 0; start_targ < arg->count; start_targ = stop_targ)
 406     {
 407       stop_targ = do_info_size (start_targ, width - longest_arch - 1, arg);
 408
 409       printf ("\n%*s", longest_arch + 1, " ");
 410       do_info_header (start_targ, stop_targ, arg);
 411       putchar ('\n');
 412
 413       for (arch = bfd_arch_obscure + 1; arch < bfd_arch_last; arch++)
 414         {
 415           if (strcmp (bfd_printable_arch_mach (arch, 0), "UNKNOWN!") != 0)
 416             {
 417               printf ("%*s ", longest_arch,
 418                       bfd_printable_arch_mach (arch, 0));
 419
 420               do_info_row (start_targ, stop_targ, arch, arg);
 421               putchar ('\n');
 422             }
 423         }
 424     }
 425 }
 426
 427 int
 428 display_info (void)
 429 {
 430   struct display_target arg;
 431
 432   printf (_("BFD header file version %s\n"), BFD_VERSION_STRING);
 433
 434   display_target_list (&arg);
 435   if (!arg.error)
 436     display_target_tables (&arg);
 437
 438   return arg.error;
 439 }
 440 \f
 441 /* Display the archive header for an element as if it were an ls -l listing:
 442
 443    Mode       User\tGroup\tSize\tDate               Name */
 444
 445 void
 446 print_arelt_descr (FILE *file, bfd *abfd, bool verbose, bool offsets)
 447 {
 448   struct stat buf;
 449
 450   if (verbose)
 451     {
 452       if (bfd_stat_arch_elt (abfd, &buf) == 0)
 453         {
 454           char modebuf[11];
 455           char timebuf[40];
 456           time_t when = buf.st_mtime;
 457           const char *ctime_result = (const char *) ctime (&when);
 458
 459           /* PR binutils/17605: Check for corrupt time values.  */
 460           if (ctime_result == NULL)
 461             sprintf (timebuf, _("<time data corrupt>"));
 462           else
 463             /* POSIX format:  skip weekday and seconds from ctime output.  */
 464             sprintf (timebuf, "%.12s %.4s", ctime_result + 4, ctime_result + 20);
 465
 466           mode_string (buf.st_mode, modebuf);
 467           modebuf[10] = '\0';
 468           /* POSIX 1003.2/D11 says to skip first character (entry type).  */
 469           fprintf (file, "%s %ld/%ld %6" PRIu64 " %s ", modebuf + 1,
 470                    (long) buf.st_uid, (long) buf.st_gid,
 471                    (uint64_t) buf.st_size, timebuf);
 472         }
 473     }
 474
 475   fprintf (file, "%s", bfd_get_filename (abfd));
 476
 477   if (offsets)
 478     {
 479       if (bfd_is_thin_archive (abfd) && abfd->proxy_origin)
 480         fprintf (file, " 0x%lx", (unsigned long) abfd->proxy_origin);
 481       else if (!bfd_is_thin_archive (abfd) && abfd->origin)
 482         fprintf (file, " 0x%lx", (unsigned long) abfd->origin);
 483     }
 484
 485   fprintf (file, "\n");
 486 }
 487
 488 /* Return a path for a new temporary file in the same directory
 489    as file PATH.  */
 490
 491 static char *
 492 template_in_dir (const char *path)
 493 {
 494 #define template "stXXXXXX"
 495   const char *slash = strrchr (path, '/');
 496   char *tmpname;
 497   size_t len;
 498
 499 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
 500   {
 501     /* We could have foo/bar\\baz, or foo\\bar, or d:bar.  */
 502     char *bslash = strrchr (path, '\\');
 503
 504     if (slash == NULL || (bslash != NULL && bslash > slash))
 505       slash = bslash;
 506     if (slash == NULL && path[0] != '\0' && path[1] == ':')
 507       slash = path + 1;
 508   }
 509 #endif
 510
 511   if (slash != (char *) NULL)
 512     {
 513       len = slash - path;
 514       tmpname = (char *) xmalloc (len + sizeof (template) + 2);
 515       memcpy (tmpname, path, len);
 516
 517 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
 518       /* If tmpname is "X:", appending a slash will make it a root
 519          directory on drive X, which is NOT the same as the current
 520          directory on drive X.  */
 521       if (len == 2 && tmpname[1] == ':')
 522         tmpname[len++] = '.';
 523 #endif
 524       tmpname[len++] = '/';
 525     }
 526   else
 527     {
 528       tmpname = (char *) xmalloc (sizeof (template));
 529       len = 0;
 530     }
 531
 532   memcpy (tmpname + len, template, sizeof (template));
 533   return tmpname;
 534 #undef template
 535 }
 536
 537 /* Return the name of a created temporary file in the same directory
 538    as FILENAME.  */
 539
 540 char *
 541 make_tempname (const char *filename, int *ofd)
 542 {
 543   char *tmpname = template_in_dir (filename);
 544   int fd;
 545
 546 #ifdef HAVE_MKSTEMP
 547   fd = mkstemp (tmpname);
 548 #else
 549   tmpname = mktemp (tmpname);
 550   if (tmpname == NULL)
 551     fd = -1;
 552   else
 553     fd = open (tmpname, O_RDWR | O_CREAT | O_EXCL, 0600);
 554 #endif
 555   if (fd == -1)
 556     {
 557       free (tmpname);
 558       return NULL;
 559     }
 560   *ofd = fd;
 561   return tmpname;
 562 }
 563
 564 /* Return the name of a created temporary directory inside the
 565    directory containing FILENAME.  */
 566
 567 char *
 568 make_tempdir (const char *filename)
 569 {
 570   char *tmpname = template_in_dir (filename);
 571   char *ret;
 572
 573 #ifdef HAVE_MKDTEMP
 574   ret = mkdtemp (tmpname);
 575 #else
 576   ret = mktemp (tmpname);
 577 #if defined (_WIN32) && !defined (__CYGWIN32__)
 578   if (mkdir (tmpname) != 0)
 579     ret = NULL;
 580 #else
 581   if (mkdir (tmpname, 0700) != 0)
 582     ret = NULL;
 583 #endif
 584 #endif
 585   if (ret == NULL)
 586     free (tmpname);
 587   return ret;
 588 }
 589
 590 /* Parse a string into a VMA, with a fatal error if it can't be
 591    parsed.  */
 592
 593 bfd_vma
 594 parse_vma (const char *s, const char *arg)
 595 {
 596   bfd_vma ret;
 597   const char *end;
 598
 599   ret = bfd_scan_vma (s, &end, 0);
 600
 601   if (*end != '\0')
 602     fatal (_("%s: bad number: %s"), arg, s);
 603
 604   return ret;
 605 }
 606
 607 /* Returns the size of the named file.  If the file does not
 608    exist, or if it is not a real file, then a suitable non-fatal
 609    error message is printed and (off_t) -1 is returned.  */
 610
 611 off_t
 612 get_file_size (const char * file_name)
 613 {
 614   struct stat statbuf;
 615
 616   if (file_name == NULL)
 617     return (off_t) -1;
 618
 619   if (stat (file_name, &statbuf) < 0)
 620     {
 621       if (errno == ENOENT)
 622         non_fatal (_("'%s': No such file"), file_name);
 623       else
 624         non_fatal (_("Warning: could not locate '%s'.  reason: %s"),
 625                    file_name, strerror (errno));
 626     }
 627   else if (S_ISDIR (statbuf.st_mode))
 628     non_fatal (_("Warning: '%s' is a directory"), file_name);
 629   else if (! S_ISREG (statbuf.st_mode))
 630     non_fatal (_("Warning: '%s' is not an ordinary file"), file_name);
 631   else if (statbuf.st_size < 0)
 632     non_fatal (_("Warning: '%s' has negative size, probably it is too large"),
 633                file_name);
 634 #if defined (_WIN32) && !defined (__CYGWIN__)
 635   else if (statbuf.st_size == 0)
 636     {
 637       /* MS-Windows 'stat' reports the null device as a regular file;
 638          fix that.  */
 639       int fd = open (file_name, O_RDONLY | O_BINARY);
 640       if (isatty (fd))
 641         {
 642           close (fd);
 643           non_fatal (_("Warning: '%s' is not an ordinary file"),
 644                      /* libtool wants to see /dev/null in the output.  */
 645                      strcasecmp (file_name, "nul") ? file_name : "/dev/null");
 646         }
 647     }
 648 #endif
 649   else
 650     return statbuf.st_size;
 651
 652   return (off_t) -1;
 653 }
 654
 655 /* Return the filename in a static buffer.  */
 656
 657 const char *
 658 bfd_get_archive_filename (const bfd *abfd)
 659 {
 660   static size_t curr = 0;
 661   static char *buf;
 662   size_t needed;
 663
 664   assert (abfd != NULL);
 665
 666   if (abfd->my_archive == NULL
 667       || bfd_is_thin_archive (abfd->my_archive))
 668     return bfd_get_filename (abfd);
 669
 670   needed = (strlen (bfd_get_filename (abfd->my_archive))
 671             + strlen (bfd_get_filename (abfd)) + 3);
 672   if (needed > curr)
 673     {
 674       if (curr)
 675         free (buf);
 676       curr = needed + (needed >> 1);
 677       buf = (char *) xmalloc (curr);
 678     }
 679   sprintf (buf, "%s(%s)", bfd_get_filename (abfd->my_archive),
 680            bfd_get_filename (abfd));
 681   return buf;
 682 }
 683
 684 /* Returns TRUE iff PATHNAME, a filename of an archive member,
 685    is valid for writing.  For security reasons absolute paths
 686    and paths containing /../ are not allowed.  See PR 17533.  */
 687
 688 bool
 689 is_valid_archive_path (char const * pathname)
 690 {
 691   const char * n = pathname;
 692
 693   if (IS_ABSOLUTE_PATH (n))
 694     return false;
 695
 696   while (*n)
 697     {
 698       if (*n == '.' && *++n == '.' && ( ! *++n || IS_DIR_SEPARATOR (*n)))
 699         return false;
 700
 701       while (*n && ! IS_DIR_SEPARATOR (*n))
 702         n++;
 703       while (IS_DIR_SEPARATOR (*n))
 704         n++;
 705     }
 706
 707   return true;
 708 }