719 lines
17 KiB
C
719 lines
17 KiB
C
/* strings -- print the strings of printable characters in files
|
||
Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
|
||
2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 3, or (at your option)
|
||
any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program; if not, write to the Free Software
|
||
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
|
||
02110-1301, USA. */
|
||
|
||
/* 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
|
||
-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,
|
||
that are followed by a NUL or a newline. Default is 4.
|
||
|
||
--radix={o,x,d}
|
||
-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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||
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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,
|
||
littleendian 32-bit.
|
||
|
||
--target=BFDNAME
|
||
-T {bfdname}
|
||
Specify a non-default object file format.
|
||
|
||
--help
|
||
-h Print the usage message on the standard output.
|
||
|
||
--version
|
||
-v Print the program version number.
|
||
|
||
Written by Richard Stallman <rms@gnu.ai.mit.edu>
|
||
and David MacKenzie <djm@gnu.ai.mit.edu>. */
|
||
|
||
#include "sysdep.h"
|
||
#include "bfd.h"
|
||
#include "getopt.h"
|
||
#include "libiberty.h"
|
||
#include "safe-ctype.h"
|
||
#include <sys/stat.h>
|
||
#include "bucomm.h"
|
||
|
||
/* Some platforms need to put stdin into binary mode, to read
|
||
binary files. */
|
||
#ifdef HAVE_SETMODE
|
||
#ifndef O_BINARY
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||
#ifdef _O_BINARY
|
||
#define O_BINARY _O_BINARY
|
||
#define setmode _setmode
|
||
#else
|
||
#define O_BINARY 0
|
||
#endif
|
||
#endif
|
||
#if O_BINARY
|
||
#include <io.h>
|
||
#define SET_BINARY(f) do { if (!isatty (f)) setmode (f,O_BINARY); } while (0)
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||
#endif
|
||
#endif
|
||
|
||
#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;
|
||
#endif
|
||
|
||
/* The BFD section flags that identify an initialized data section. */
|
||
#define DATA_FLAGS (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS)
|
||
|
||
#ifdef HAVE_FOPEN64
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||
typedef off64_t file_off;
|
||
#define file_open(s,m) fopen64(s, m)
|
||
#else
|
||
typedef off_t file_off;
|
||
#define file_open(s,m) fopen(s, m)
|
||
#endif
|
||
#ifdef HAVE_STAT64
|
||
typedef struct stat64 statbuf;
|
||
#define file_stat(f,s) stat64(f, s)
|
||
#else
|
||
typedef struct stat statbuf;
|
||
#define file_stat(f,s) stat(f, s)
|
||
#endif
|
||
|
||
/* Radix for printing addresses (must be 8, 10 or 16). */
|
||
static int address_radix;
|
||
|
||
/* Minimum length of sequence of graphic chars to trigger output. */
|
||
static int string_min;
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||
|
||
/* TRUE means print address within file for each string. */
|
||
static bfd_boolean print_addresses;
|
||
|
||
/* TRUE means print filename for each string. */
|
||
static bfd_boolean print_filenames;
|
||
|
||
/* TRUE means for object files scan only the data section. */
|
||
static bfd_boolean datasection_only;
|
||
|
||
/* TRUE if we found an initialized data section in the current file. */
|
||
static bfd_boolean got_a_section;
|
||
|
||
/* The BFD object file format. */
|
||
static char *target;
|
||
|
||
/* The character encoding format. */
|
||
static char encoding;
|
||
static int encoding_bytes;
|
||
|
||
static struct option long_options[] =
|
||
{
|
||
{"all", no_argument, NULL, 'a'},
|
||
{"print-file-name", no_argument, NULL, 'f'},
|
||
{"bytes", required_argument, NULL, 'n'},
|
||
{"radix", required_argument, NULL, 't'},
|
||
{"encoding", required_argument, NULL, 'e'},
|
||
{"target", required_argument, NULL, 'T'},
|
||
{"help", no_argument, NULL, 'h'},
|
||
{"version", no_argument, NULL, 'v'},
|
||
{NULL, 0, NULL, 0}
|
||
};
|
||
|
||
/* Records the size of a named file so that we
|
||
do not repeatedly run bfd_stat() on it. */
|
||
|
||
typedef struct
|
||
{
|
||
const char * filename;
|
||
bfd_size_type filesize;
|
||
} filename_and_size_t;
|
||
|
||
static void strings_a_section (bfd *, asection *, void *);
|
||
static bfd_boolean strings_object_file (const char *);
|
||
static bfd_boolean strings_file (char *file);
|
||
static int integer_arg (char *s);
|
||
static void print_strings (const char *, FILE *, file_off, int, int, char *);
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||
static void usage (FILE *, int);
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||
static long get_char (FILE *, file_off *, int *, char **);
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||
|
||
int main (int, char **);
|
||
|
||
int
|
||
main (int argc, char **argv)
|
||
{
|
||
int optc;
|
||
int exit_status = 0;
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||
bfd_boolean files_given = FALSE;
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||
|
||
#if defined (HAVE_SETLOCALE)
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||
setlocale (LC_ALL, "");
|
||
#endif
|
||
bindtextdomain (PACKAGE, LOCALEDIR);
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||
textdomain (PACKAGE);
|
||
|
||
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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||
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||
string_min = -1;
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||
print_addresses = FALSE;
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||
print_filenames = FALSE;
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||
datasection_only = TRUE;
|
||
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)
|
||
{
|
||
switch (optc)
|
||
{
|
||
case 'a':
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||
datasection_only = FALSE;
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||
break;
|
||
|
||
case 'f':
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||
print_filenames = TRUE;
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||
break;
|
||
|
||
case 'H':
|
||
case 'h':
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||
usage (stdout, 0);
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||
|
||
case 'n':
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||
string_min = integer_arg (optarg);
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||
if (string_min < 1)
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||
fatal (_("invalid number %s"), optarg);
|
||
break;
|
||
|
||
case 'o':
|
||
print_addresses = TRUE;
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||
address_radix = 8;
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||
break;
|
||
|
||
case 't':
|
||
print_addresses = TRUE;
|
||
if (optarg[1] != '\0')
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||
usage (stderr, 1);
|
||
switch (optarg[0])
|
||
{
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||
case 'o':
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||
address_radix = 8;
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||
break;
|
||
|
||
case 'd':
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||
address_radix = 10;
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||
break;
|
||
|
||
case 'x':
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||
address_radix = 16;
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||
break;
|
||
|
||
default:
|
||
usage (stderr, 1);
|
||
}
|
||
break;
|
||
|
||
case 'T':
|
||
target = optarg;
|
||
break;
|
||
|
||
case 'e':
|
||
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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||
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||
default:
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||
if (string_min < 0)
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||
string_min = optc - '0';
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||
else
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||
string_min = string_min * 10 + optc - '0';
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||
break;
|
||
}
|
||
}
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||
|
||
if (string_min < 0)
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||
string_min = 4;
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||
|
||
switch (encoding)
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||
{
|
||
case 'S':
|
||
case 's':
|
||
encoding_bytes = 1;
|
||
break;
|
||
case 'b':
|
||
case 'l':
|
||
encoding_bytes = 2;
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||
break;
|
||
case 'B':
|
||
case 'L':
|
||
encoding_bytes = 4;
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||
break;
|
||
default:
|
||
usage (stderr, 1);
|
||
}
|
||
|
||
bfd_init ();
|
||
set_default_bfd_target ();
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||
|
||
if (optind >= argc)
|
||
{
|
||
datasection_only = FALSE;
|
||
#ifdef SET_BINARY
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||
SET_BINARY (fileno (stdin));
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||
#endif
|
||
print_strings ("{standard input}", stdin, 0, 0, 0, (char *) NULL);
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||
files_given = TRUE;
|
||
}
|
||
else
|
||
{
|
||
for (; optind < argc; ++optind)
|
||
{
|
||
if (strcmp (argv[optind], "-") == 0)
|
||
datasection_only = FALSE;
|
||
else
|
||
{
|
||
files_given = TRUE;
|
||
exit_status |= strings_file (argv[optind]) == FALSE;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (!files_given)
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||
usage (stderr, 1);
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||
|
||
return (exit_status);
|
||
}
|
||
|
||
/* Scan section SECT of the file ABFD, whose printable name is in
|
||
ARG->filename and whose size might be in ARG->filesize. If it
|
||
contains initialized data set `got_a_section' and print the
|
||
strings in it.
|
||
|
||
FIXME: We ought to be able to return error codes/messages for
|
||
certain conditions. */
|
||
|
||
static void
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||
strings_a_section (bfd *abfd, asection *sect, void *arg)
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||
{
|
||
filename_and_size_t * filename_and_sizep;
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||
bfd_size_type *filesizep;
|
||
bfd_size_type sectsize;
|
||
void *mem;
|
||
|
||
if ((sect->flags & DATA_FLAGS) != DATA_FLAGS)
|
||
return;
|
||
|
||
sectsize = bfd_get_section_size (sect);
|
||
|
||
if (sectsize <= 0)
|
||
return;
|
||
|
||
/* Get the size of the file. This might have been cached for us. */
|
||
filename_and_sizep = (filename_and_size_t *) arg;
|
||
filesizep = & filename_and_sizep->filesize;
|
||
|
||
if (*filesizep == 0)
|
||
{
|
||
struct stat st;
|
||
|
||
if (bfd_stat (abfd, &st))
|
||
return;
|
||
|
||
/* Cache the result so that we do not repeatedly stat this file. */
|
||
*filesizep = st.st_size;
|
||
}
|
||
|
||
/* Compare the size of the section against the size of the file.
|
||
If the section is bigger then the file must be corrupt and
|
||
we should not try dumping it. */
|
||
if (sectsize >= *filesizep)
|
||
return;
|
||
|
||
mem = xmalloc (sectsize);
|
||
|
||
if (bfd_get_section_contents (abfd, sect, mem, (file_ptr) 0, sectsize))
|
||
{
|
||
got_a_section = TRUE;
|
||
|
||
print_strings (filename_and_sizep->filename, NULL, sect->filepos,
|
||
0, sectsize, mem);
|
||
}
|
||
|
||
free (mem);
|
||
}
|
||
|
||
/* Scan all of the sections in FILE, and print the strings
|
||
in the initialized data section(s).
|
||
|
||
Return TRUE if successful,
|
||
FALSE if not (such as if FILE is not an object file). */
|
||
|
||
static bfd_boolean
|
||
strings_object_file (const char *file)
|
||
{
|
||
filename_and_size_t filename_and_size;
|
||
bfd *abfd;
|
||
|
||
abfd = bfd_openr (file, target);
|
||
|
||
if (abfd == NULL)
|
||
/* Treat the file as a non-object file. */
|
||
return FALSE;
|
||
|
||
/* This call is mainly for its side effect of reading in the sections.
|
||
We follow the traditional behavior of `strings' in that we don't
|
||
complain if we don't recognize a file to be an object file. */
|
||
if (!bfd_check_format (abfd, bfd_object))
|
||
{
|
||
bfd_close (abfd);
|
||
return FALSE;
|
||
}
|
||
|
||
got_a_section = FALSE;
|
||
filename_and_size.filename = file;
|
||
filename_and_size.filesize = 0;
|
||
bfd_map_over_sections (abfd, strings_a_section, & filename_and_size);
|
||
|
||
if (!bfd_close (abfd))
|
||
{
|
||
bfd_nonfatal (file);
|
||
return FALSE;
|
||
}
|
||
|
||
return got_a_section;
|
||
}
|
||
|
||
/* Print the strings in FILE. Return TRUE if ok, FALSE if an error occurs. */
|
||
|
||
static bfd_boolean
|
||
strings_file (char *file)
|
||
{
|
||
statbuf st;
|
||
|
||
if (file_stat (file, &st) < 0)
|
||
{
|
||
if (errno == ENOENT)
|
||
non_fatal (_("'%s': No such file"), file);
|
||
else
|
||
non_fatal (_("Warning: could not locate '%s'. reason: %s"),
|
||
file, strerror (errno));
|
||
return FALSE;
|
||
}
|
||
|
||
/* If we weren't told to scan the whole file,
|
||
try to open it as an object file and only look at
|
||
initialized data sections. If that fails, fall back to the
|
||
whole file. */
|
||
if (!datasection_only || !strings_object_file (file))
|
||
{
|
||
FILE *stream;
|
||
|
||
stream = file_open (file, FOPEN_RB);
|
||
if (stream == NULL)
|
||
{
|
||
fprintf (stderr, "%s: ", program_name);
|
||
perror (file);
|
||
return FALSE;
|
||
}
|
||
|
||
print_strings (file, stream, (file_off) 0, 0, 0, (char *) 0);
|
||
|
||
if (fclose (stream) == EOF)
|
||
{
|
||
fprintf (stderr, "%s: ", program_name);
|
||
perror (file);
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Read the next character, return EOF if none available.
|
||
Assume that STREAM is positioned so that the next byte read
|
||
is at address ADDRESS in the file.
|
||
|
||
If STREAM is NULL, do not read from it.
|
||
The caller can supply a buffer of characters
|
||
to be processed before the data in STREAM.
|
||
MAGIC is the address of the buffer and
|
||
MAGICCOUNT is how many characters are in it. */
|
||
|
||
static long
|
||
get_char (FILE *stream, file_off *address, int *magiccount, char **magic)
|
||
{
|
||
int c, i;
|
||
long r = EOF;
|
||
unsigned char buf[4];
|
||
|
||
for (i = 0; i < encoding_bytes; i++)
|
||
{
|
||
if (*magiccount)
|
||
{
|
||
(*magiccount)--;
|
||
c = *(*magic)++;
|
||
}
|
||
else
|
||
{
|
||
if (stream == NULL)
|
||
return EOF;
|
||
|
||
/* Only use getc_unlocked if we found a declaration for it.
|
||
Otherwise, libc is not thread safe by default, and we
|
||
should not use it. */
|
||
|
||
#if defined(HAVE_GETC_UNLOCKED) && HAVE_DECL_GETC_UNLOCKED
|
||
c = getc_unlocked (stream);
|
||
#else
|
||
c = getc (stream);
|
||
#endif
|
||
if (c == EOF)
|
||
return EOF;
|
||
}
|
||
|
||
(*address)++;
|
||
buf[i] = c;
|
||
}
|
||
|
||
switch (encoding)
|
||
{
|
||
case 'S':
|
||
case 's':
|
||
r = buf[0];
|
||
break;
|
||
case 'b':
|
||
r = (buf[0] << 8) | buf[1];
|
||
break;
|
||
case 'l':
|
||
r = buf[0] | (buf[1] << 8);
|
||
break;
|
||
case 'B':
|
||
r = ((long) buf[0] << 24) | ((long) buf[1] << 16) |
|
||
((long) buf[2] << 8) | buf[3];
|
||
break;
|
||
case 'L':
|
||
r = buf[0] | ((long) buf[1] << 8) | ((long) buf[2] << 16) |
|
||
((long) buf[3] << 24);
|
||
break;
|
||
}
|
||
|
||
if (r == EOF)
|
||
return 0;
|
||
|
||
return r;
|
||
}
|
||
|
||
/* Find the strings in file FILENAME, read from STREAM.
|
||
Assume that STREAM is positioned so that the next byte read
|
||
is at address ADDRESS in the file.
|
||
Stop reading at address STOP_POINT in the file, if nonzero.
|
||
|
||
If STREAM is NULL, do not read from it.
|
||
The caller can supply a buffer of characters
|
||
to be processed before the data in STREAM.
|
||
MAGIC is the address of the buffer and
|
||
MAGICCOUNT is how many characters are in it.
|
||
Those characters come at address ADDRESS and the data in STREAM follow. */
|
||
|
||
static void
|
||
print_strings (const char *filename, FILE *stream, file_off address,
|
||
int stop_point, int magiccount, char *magic)
|
||
{
|
||
char *buf = (char *) xmalloc (sizeof (char) * (string_min + 1));
|
||
|
||
while (1)
|
||
{
|
||
file_off start;
|
||
int i;
|
||
long c;
|
||
|
||
/* See if the next `string_min' chars are all graphic chars. */
|
||
tryline:
|
||
if (stop_point && address >= stop_point)
|
||
break;
|
||
start = address;
|
||
for (i = 0; i < string_min; i++)
|
||
{
|
||
c = get_char (stream, &address, &magiccount, &magic);
|
||
if (c == EOF)
|
||
return;
|
||
if (! STRING_ISGRAPHIC (c))
|
||
/* Found a non-graphic. Try again starting with next char. */
|
||
goto tryline;
|
||
buf[i] = c;
|
||
}
|
||
|
||
/* We found a run of `string_min' graphic characters. Print up
|
||
to the next non-graphic character. */
|
||
|
||
if (print_filenames)
|
||
printf ("%s: ", filename);
|
||
if (print_addresses)
|
||
switch (address_radix)
|
||
{
|
||
case 8:
|
||
#if __STDC_VERSION__ >= 199901L || (defined(__GNUC__) && __GNUC__ >= 2)
|
||
if (sizeof (start) > sizeof (long))
|
||
printf ("%7llo ", (unsigned long long) start);
|
||
else
|
||
#elif !BFD_HOST_64BIT_LONG
|
||
if (start != (unsigned long) start)
|
||
printf ("++%7lo ", (unsigned long) start);
|
||
else
|
||
#endif
|
||
printf ("%7lo ", (unsigned long) start);
|
||
break;
|
||
|
||
case 10:
|
||
#if __STDC_VERSION__ >= 199901L || (defined(__GNUC__) && __GNUC__ >= 2)
|
||
if (sizeof (start) > sizeof (long))
|
||
printf ("%7lld ", (unsigned long long) start);
|
||
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))
|
||
printf ("%7llx ", (unsigned long long) start);
|
||
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');
|
||
}
|
||
}
|
||
|
||
/* Parse string S as an integer, using decimal radix by default,
|
||
but allowing octal and hex numbers as in C. */
|
||
|
||
static int
|
||
integer_arg (char *s)
|
||
{
|
||
int value;
|
||
int radix = 10;
|
||
char *p = s;
|
||
int c;
|
||
|
||
if (*p != '0')
|
||
radix = 10;
|
||
else if (*++p == 'x')
|
||
{
|
||
radix = 16;
|
||
p++;
|
||
}
|
||
else
|
||
radix = 8;
|
||
|
||
value = 0;
|
||
while (((c = *p++) >= '0' && c <= '9')
|
||
|| (radix == 16 && (c & ~40) >= 'A' && (c & ~40) <= 'Z'))
|
||
{
|
||
value *= radix;
|
||
if (c >= '0' && c <= '9')
|
||
value += c - '0';
|
||
else
|
||
value += (c & ~40) - 'A';
|
||
}
|
||
|
||
if (c == 'b')
|
||
value *= 512;
|
||
else if (c == 'B')
|
||
value *= 1024;
|
||
else
|
||
p--;
|
||
|
||
if (*p)
|
||
fatal (_("invalid integer argument %s"), s);
|
||
|
||
return value;
|
||
}
|
||
|
||
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 --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);
|
||
}
|