654 lines
16 KiB
C
654 lines
16 KiB
C
/* strings -- print the strings of printable characters in files
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Copyright (C) 1993-2014 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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/* Usage: strings [options] file...
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Options:
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--all
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-a
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- Do not scan only the initialized data section of object files.
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--print-file-name
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-f Print the name of the file before each string.
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--bytes=min-len
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-n min-len
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-min-len Print graphic char sequences, MIN-LEN or more bytes long,
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that are followed by a NUL or a newline. Default is 4.
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--radix={o,x,d}
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-t {o,x,d} Print the offset within the file before each string,
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in octal/hex/decimal.
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-o Like -to. (Some other implementations have -o like -to,
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others like -td. We chose one arbitrarily.)
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--encoding={s,S,b,l,B,L}
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-e {s,S,b,l,B,L}
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Select character encoding: 7-bit-character, 8-bit-character,
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bigendian 16-bit, littleendian 16-bit, bigendian 32-bit,
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littleendian 32-bit.
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--target=BFDNAME
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-T {bfdname}
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Specify a non-default object file format.
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--help
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-h Print the usage message on the standard output.
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--version
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-V
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-v Print the program version number.
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Written by Richard Stallman <rms@gnu.ai.mit.edu>
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and David MacKenzie <djm@gnu.ai.mit.edu>. */
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#include "sysdep.h"
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#include "bfd.h"
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#include "getopt.h"
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#include "libiberty.h"
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#include "safe-ctype.h"
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#include "bucomm.h"
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#define STRING_ISGRAPHIC(c) \
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( (c) >= 0 \
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&& (c) <= 255 \
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&& ((c) == '\t' || ISPRINT (c) || (encoding == 'S' && (c) > 127)))
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#ifndef errno
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extern int errno;
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#endif
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/* The BFD section flags that identify an initialized data section. */
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#define DATA_FLAGS (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS)
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/* Radix for printing addresses (must be 8, 10 or 16). */
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static int address_radix;
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/* Minimum length of sequence of graphic chars to trigger output. */
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static int string_min;
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/* TRUE means print address within file for each string. */
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static bfd_boolean print_addresses;
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/* TRUE means print filename for each string. */
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static bfd_boolean print_filenames;
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/* TRUE means for object files scan only the data section. */
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static bfd_boolean datasection_only;
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/* TRUE if we found an initialized data section in the current file. */
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static bfd_boolean got_a_section;
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/* The BFD object file format. */
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static char *target;
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/* The character encoding format. */
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static char encoding;
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static int encoding_bytes;
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static struct option long_options[] =
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{
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{"all", no_argument, NULL, 'a'},
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{"print-file-name", no_argument, NULL, 'f'},
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{"bytes", required_argument, NULL, 'n'},
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{"radix", required_argument, NULL, 't'},
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{"encoding", required_argument, NULL, 'e'},
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{"target", required_argument, NULL, 'T'},
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{"help", no_argument, NULL, 'h'},
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{"version", no_argument, NULL, 'v'},
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{NULL, 0, NULL, 0}
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};
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/* Records the size of a named file so that we
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do not repeatedly run bfd_stat() on it. */
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typedef struct
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{
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const char * filename;
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bfd_size_type filesize;
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} filename_and_size_t;
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static void strings_a_section (bfd *, asection *, void *);
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static bfd_boolean strings_object_file (const char *);
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static bfd_boolean strings_file (char *file);
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static void print_strings (const char *, FILE *, file_ptr, int, int, char *);
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static void usage (FILE *, int);
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static long get_char (FILE *, file_ptr *, int *, char **);
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int main (int, char **);
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int
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main (int argc, char **argv)
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{
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int optc;
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int exit_status = 0;
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bfd_boolean files_given = FALSE;
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char *s;
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int numeric_opt = 0;
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#if defined (HAVE_SETLOCALE)
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setlocale (LC_ALL, "");
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#endif
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bindtextdomain (PACKAGE, LOCALEDIR);
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textdomain (PACKAGE);
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program_name = argv[0];
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xmalloc_set_program_name (program_name);
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expandargv (&argc, &argv);
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string_min = 4;
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print_addresses = FALSE;
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print_filenames = FALSE;
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datasection_only = TRUE;
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target = NULL;
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encoding = 's';
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while ((optc = getopt_long (argc, argv, "afhHn:ot:e:T:Vv0123456789",
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long_options, (int *) 0)) != EOF)
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{
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switch (optc)
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{
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case 'a':
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datasection_only = FALSE;
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break;
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case 'f':
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print_filenames = TRUE;
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break;
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case 'H':
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case 'h':
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usage (stdout, 0);
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case 'n':
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string_min = (int) strtoul (optarg, &s, 0);
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if (s != NULL && *s != 0)
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fatal (_("invalid integer argument %s"), optarg);
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break;
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case 'o':
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print_addresses = TRUE;
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address_radix = 8;
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break;
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case 't':
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print_addresses = TRUE;
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if (optarg[1] != '\0')
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usage (stderr, 1);
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switch (optarg[0])
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{
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case 'o':
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address_radix = 8;
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break;
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case 'd':
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address_radix = 10;
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break;
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case 'x':
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address_radix = 16;
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break;
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default:
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usage (stderr, 1);
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}
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break;
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case 'T':
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target = optarg;
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break;
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case 'e':
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if (optarg[1] != '\0')
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usage (stderr, 1);
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encoding = optarg[0];
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break;
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case 'V':
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case 'v':
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print_version ("strings");
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break;
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case '?':
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usage (stderr, 1);
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default:
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numeric_opt = optind;
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break;
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}
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}
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if (numeric_opt != 0)
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{
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string_min = (int) strtoul (argv[numeric_opt - 1] + 1, &s, 0);
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if (s != NULL && *s != 0)
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fatal (_("invalid integer argument %s"), argv[numeric_opt - 1] + 1);
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}
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if (string_min < 1)
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fatal (_("invalid minimum string length %d"), string_min);
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switch (encoding)
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{
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case 'S':
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case 's':
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encoding_bytes = 1;
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break;
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case 'b':
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case 'l':
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encoding_bytes = 2;
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break;
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case 'B':
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case 'L':
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encoding_bytes = 4;
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break;
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default:
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usage (stderr, 1);
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}
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bfd_init ();
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set_default_bfd_target ();
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if (optind >= argc)
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{
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datasection_only = FALSE;
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SET_BINARY (fileno (stdin));
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print_strings ("{standard input}", stdin, 0, 0, 0, (char *) NULL);
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files_given = TRUE;
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}
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else
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{
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for (; optind < argc; ++optind)
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{
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if (strcmp (argv[optind], "-") == 0)
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datasection_only = FALSE;
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else
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{
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files_given = TRUE;
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exit_status |= strings_file (argv[optind]) == FALSE;
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}
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}
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}
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if (!files_given)
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usage (stderr, 1);
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return (exit_status);
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}
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/* Scan section SECT of the file ABFD, whose printable name is in
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ARG->filename and whose size might be in ARG->filesize. If it
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contains initialized data set `got_a_section' and print the
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strings in it.
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FIXME: We ought to be able to return error codes/messages for
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certain conditions. */
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static void
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strings_a_section (bfd *abfd, asection *sect, void *arg)
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{
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filename_and_size_t * filename_and_sizep;
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bfd_size_type *filesizep;
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bfd_size_type sectsize;
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void *mem;
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if ((sect->flags & DATA_FLAGS) != DATA_FLAGS)
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return;
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sectsize = bfd_get_section_size (sect);
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if (sectsize <= 0)
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return;
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/* Get the size of the file. This might have been cached for us. */
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filename_and_sizep = (filename_and_size_t *) arg;
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filesizep = & filename_and_sizep->filesize;
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if (*filesizep == 0)
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{
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struct stat st;
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if (bfd_stat (abfd, &st))
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return;
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/* Cache the result so that we do not repeatedly stat this file. */
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*filesizep = st.st_size;
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}
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/* Compare the size of the section against the size of the file.
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If the section is bigger then the file must be corrupt and
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we should not try dumping it. */
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if (sectsize >= *filesizep)
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return;
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mem = xmalloc (sectsize);
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if (bfd_get_section_contents (abfd, sect, mem, (file_ptr) 0, sectsize))
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{
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got_a_section = TRUE;
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print_strings (filename_and_sizep->filename, NULL, sect->filepos,
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0, sectsize, (char *) mem);
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}
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free (mem);
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}
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/* Scan all of the sections in FILE, and print the strings
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in the initialized data section(s).
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Return TRUE if successful,
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FALSE if not (such as if FILE is not an object file). */
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static bfd_boolean
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strings_object_file (const char *file)
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{
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filename_and_size_t filename_and_size;
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bfd *abfd;
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abfd = bfd_openr (file, target);
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if (abfd == NULL)
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/* Treat the file as a non-object file. */
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return FALSE;
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/* This call is mainly for its side effect of reading in the sections.
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We follow the traditional behavior of `strings' in that we don't
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complain if we don't recognize a file to be an object file. */
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if (!bfd_check_format (abfd, bfd_object))
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{
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bfd_close (abfd);
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return FALSE;
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}
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got_a_section = FALSE;
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filename_and_size.filename = file;
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filename_and_size.filesize = 0;
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bfd_map_over_sections (abfd, strings_a_section, & filename_and_size);
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if (!bfd_close (abfd))
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{
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bfd_nonfatal (file);
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return FALSE;
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}
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return got_a_section;
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}
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/* Print the strings in FILE. Return TRUE if ok, FALSE if an error occurs. */
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static bfd_boolean
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strings_file (char *file)
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{
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struct stat st;
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/* get_file_size does not support non-S_ISREG files. */
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if (stat (file, &st) < 0)
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{
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if (errno == ENOENT)
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non_fatal (_("'%s': No such file"), file);
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else
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non_fatal (_("Warning: could not locate '%s'. reason: %s"),
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file, strerror (errno));
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return FALSE;
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}
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/* If we weren't told to scan the whole file,
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try to open it as an object file and only look at
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initialized data sections. If that fails, fall back to the
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whole file. */
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if (!datasection_only || !strings_object_file (file))
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{
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FILE *stream;
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stream = fopen (file, FOPEN_RB);
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if (stream == NULL)
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{
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fprintf (stderr, "%s: ", program_name);
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perror (file);
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return FALSE;
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}
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print_strings (file, stream, (file_ptr) 0, 0, 0, (char *) 0);
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if (fclose (stream) == EOF)
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{
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fprintf (stderr, "%s: ", program_name);
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perror (file);
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return FALSE;
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}
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}
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return TRUE;
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}
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/* Read the next character, return EOF if none available.
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Assume that STREAM is positioned so that the next byte read
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is at address ADDRESS in the file.
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If STREAM is NULL, do not read from it.
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The caller can supply a buffer of characters
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to be processed before the data in STREAM.
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MAGIC is the address of the buffer and
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MAGICCOUNT is how many characters are in it. */
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static long
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get_char (FILE *stream, file_ptr *address, int *magiccount, char **magic)
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{
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int c, i;
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long r = 0;
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for (i = 0; i < encoding_bytes; i++)
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{
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if (*magiccount)
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{
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(*magiccount)--;
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c = *(*magic)++;
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}
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else
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{
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if (stream == NULL)
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return EOF;
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/* Only use getc_unlocked if we found a declaration for it.
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Otherwise, libc is not thread safe by default, and we
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should not use it. */
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#if defined(HAVE_GETC_UNLOCKED) && HAVE_DECL_GETC_UNLOCKED
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c = getc_unlocked (stream);
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#else
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c = getc (stream);
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#endif
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if (c == EOF)
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return EOF;
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}
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(*address)++;
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r = (r << 8) | (c & 0xff);
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}
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switch (encoding)
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{
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default:
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break;
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case 'l':
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r = ((r & 0xff) << 8) | ((r & 0xff00) >> 8);
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break;
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case 'L':
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r = (((r & 0xff) << 24) | ((r & 0xff00) << 8)
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| ((r & 0xff0000) >> 8) | ((r & 0xff000000) >> 24));
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break;
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}
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return r;
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}
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/* Find the strings in file FILENAME, read from STREAM.
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Assume that STREAM is positioned so that the next byte read
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is at address ADDRESS in the file.
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Stop reading at address STOP_POINT in the file, if nonzero.
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If STREAM is NULL, do not read from it.
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The caller can supply a buffer of characters
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to be processed before the data in STREAM.
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MAGIC is the address of the buffer and
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MAGICCOUNT is how many characters are in it.
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Those characters come at address ADDRESS and the data in STREAM follow. */
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static void
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print_strings (const char *filename, FILE *stream, file_ptr address,
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int stop_point, int magiccount, char *magic)
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{
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char *buf = (char *) xmalloc (sizeof (char) * (string_min + 1));
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while (1)
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{
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file_ptr start;
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int i;
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long c;
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/* See if the next `string_min' chars are all graphic chars. */
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tryline:
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if (stop_point && address >= stop_point)
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break;
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start = address;
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for (i = 0; i < string_min; i++)
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{
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c = get_char (stream, &address, &magiccount, &magic);
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if (c == EOF)
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{
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free (buf);
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return;
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}
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if (! STRING_ISGRAPHIC (c))
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/* Found a non-graphic. Try again starting with next char. */
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goto tryline;
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buf[i] = c;
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}
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/* We found a run of `string_min' graphic characters. Print up
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to the next non-graphic character. */
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if (print_filenames)
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printf ("%s: ", filename);
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if (print_addresses)
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switch (address_radix)
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{
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case 8:
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#if __STDC_VERSION__ >= 199901L || (defined(__GNUC__) && __GNUC__ >= 2)
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if (sizeof (start) > sizeof (long))
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{
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#ifndef __MSVCRT__
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printf ("%7llo ", (unsigned long long) start);
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#else
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printf ("%7I64o ", (unsigned long long) start);
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#endif
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}
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else
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#elif !BFD_HOST_64BIT_LONG
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if (start != (unsigned long) start)
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printf ("++%7lo ", (unsigned long) start);
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else
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#endif
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printf ("%7lo ", (unsigned long) start);
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break;
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case 10:
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#if __STDC_VERSION__ >= 199901L || (defined(__GNUC__) && __GNUC__ >= 2)
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if (sizeof (start) > sizeof (long))
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{
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#ifndef __MSVCRT__
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printf ("%7lld ", (unsigned long long) start);
|
||
#else
|
||
printf ("%7I64d ", (unsigned long long) start);
|
||
#endif
|
||
}
|
||
else
|
||
#elif !BFD_HOST_64BIT_LONG
|
||
if (start != (unsigned long) start)
|
||
printf ("++%7ld ", (unsigned long) start);
|
||
else
|
||
#endif
|
||
printf ("%7ld ", (long) start);
|
||
break;
|
||
|
||
case 16:
|
||
#if __STDC_VERSION__ >= 199901L || (defined(__GNUC__) && __GNUC__ >= 2)
|
||
if (sizeof (start) > sizeof (long))
|
||
{
|
||
#ifndef __MSVCRT__
|
||
printf ("%7llx ", (unsigned long long) start);
|
||
#else
|
||
printf ("%7I64x ", (unsigned long long) start);
|
||
#endif
|
||
}
|
||
else
|
||
#elif !BFD_HOST_64BIT_LONG
|
||
if (start != (unsigned long) start)
|
||
printf ("%lx%8.8lx ", (unsigned long) (start >> 32),
|
||
(unsigned long) (start & 0xffffffff));
|
||
else
|
||
#endif
|
||
printf ("%7lx ", (unsigned long) start);
|
||
break;
|
||
}
|
||
|
||
buf[i] = '\0';
|
||
fputs (buf, stdout);
|
||
|
||
while (1)
|
||
{
|
||
c = get_char (stream, &address, &magiccount, &magic);
|
||
if (c == EOF)
|
||
break;
|
||
if (! STRING_ISGRAPHIC (c))
|
||
break;
|
||
putchar (c);
|
||
}
|
||
|
||
putchar ('\n');
|
||
}
|
||
free (buf);
|
||
}
|
||
|
||
static void
|
||
usage (FILE *stream, int status)
|
||
{
|
||
fprintf (stream, _("Usage: %s [option(s)] [file(s)]\n"), program_name);
|
||
fprintf (stream, _(" Display printable strings in [file(s)] (stdin by default)\n"));
|
||
fprintf (stream, _(" The options are:\n\
|
||
-a - --all Scan the entire file, not just the data section\n\
|
||
-f --print-file-name Print the name of the file before each string\n\
|
||
-n --bytes=[number] Locate & print any NUL-terminated sequence of at\n\
|
||
-<number> least [number] characters (default 4).\n\
|
||
-t --radix={o,d,x} Print the location of the string in base 8, 10 or 16\n\
|
||
-o An alias for --radix=o\n\
|
||
-T --target=<BFDNAME> Specify the binary file format\n\
|
||
-e --encoding={s,S,b,l,B,L} Select character size and endianness:\n\
|
||
s = 7-bit, S = 8-bit, {b,l} = 16-bit, {B,L} = 32-bit\n\
|
||
@<file> Read options from <file>\n\
|
||
-h --help Display this information\n\
|
||
-v -V --version Print the program's version number\n"));
|
||
list_supported_targets (program_name, stream);
|
||
if (REPORT_BUGS_TO[0] && status == 0)
|
||
fprintf (stream, _("Report bugs to %s\n"), REPORT_BUGS_TO);
|
||
exit (status);
|
||
}
|