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/* Print the strings of printable characters in files.
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Copyright (C) 2005-2010, 2012, 2014 Red Hat, Inc.
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This file is part of elfutils.
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Written by Ulrich Drepper <drepper@redhat.com>, 2005.
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This file 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 of the License, or
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(at your option) any later version.
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elfutils is distributed in the hope that it will be useful, but
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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, see <http://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <argp.h>
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#include <assert.h>
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#include <ctype.h>
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#include <endian.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <gelf.h>
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#include <inttypes.h>
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#include <libintl.h>
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#include <locale.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdio_ext.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <libeu.h>
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#include <system.h>
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#include <printversion.h>
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#ifndef MAP_POPULATE
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# define MAP_POPULATE 0
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#endif
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/* Prototypes of local functions. */
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static int read_fd (int fd, const char *fname, off_t fdlen);
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static int read_elf (Elf *elf, int fd, const char *fname, off_t fdlen);
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/* Name and version of program. */
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ARGP_PROGRAM_VERSION_HOOK_DEF = print_version;
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/* Bug report address. */
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ARGP_PROGRAM_BUG_ADDRESS_DEF = PACKAGE_BUGREPORT;
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/* Definitions of arguments for argp functions. */
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static const struct argp_option options[] =
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{
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{ NULL, 0, NULL, 0, N_("Output Selection:"), 0 },
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{ "all", 'a', NULL, 0, N_("Scan entire file, not only loaded sections"), 0 },
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{ "bytes", 'n', "MIN-LEN", 0,
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N_("Only NUL-terminated sequences of MIN-LEN characters or more are printed"), 0 },
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{ "encoding", 'e', "SELECTOR", 0, N_("\
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Select character size and endianess: s = 7-bit, S = 8-bit, {b,l} = 16-bit, {B,L} = 32-bit"),
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0},
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{ "print-file-name", 'f', NULL, 0,
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N_("Print name of the file before each string."), 0 },
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{ "radix", 't', "{o,d,x}", 0,
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N_("Print location of the string in base 8, 10, or 16 respectively."), 0 },
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{ NULL, 'o', NULL, 0, N_("Alias for --radix=o"), 0 },
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{ NULL, 0, NULL, 0, N_("Miscellaneous:"), 0 },
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{ NULL, 0, NULL, 0, NULL, 0 }
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};
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/* Short description of program. */
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static const char doc[] = N_("\
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Print the strings of printable characters in files.");
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/* Strings for arguments in help texts. */
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static const char args_doc[] = N_("[FILE...]");
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/* Prototype for option handler. */
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static error_t parse_opt (int key, char *arg, struct argp_state *state);
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/* Data structure to communicate with argp functions. */
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static struct argp argp =
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{
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options, parse_opt, args_doc, doc, NULL, NULL, NULL
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};
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/* Global variables. */
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/* True if whole file and not only loaded sections are looked at. */
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static bool entire_file;
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/* Minimum length of any sequence reported. */
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static size_t min_len = 4;
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/* Number of bytes per character. */
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static size_t bytes_per_char = 1;
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/* Minimum length of any sequence reported in bytes. */
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static size_t min_len_bytes;
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/* True if multibyte characters are in big-endian order. */
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static bool big_endian;
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/* True unless 7-bit ASCII are expected. */
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static bool char_7bit;
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/* True if file names should be printed before strings. */
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static bool print_file_name;
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/* Radix for printed numbers. */
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static enum
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{
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radix_none = 0,
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radix_decimal,
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radix_hex,
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radix_octal
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} radix = radix_none;
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/* Page size in use. */
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static size_t ps;
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/* Mapped parts of the ELF file. */
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static unsigned char *elfmap;
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static unsigned char *elfmap_base;
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static size_t elfmap_size;
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static off_t elfmap_off;
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int
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main (int argc, char *argv[])
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{
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/* We use no threads. */
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__fsetlocking (stdin, FSETLOCKING_BYCALLER);
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__fsetlocking (stdout, FSETLOCKING_BYCALLER);
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/* Set locale. */
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(void) setlocale (LC_ALL, "");
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/* Make sure the message catalog can be found. */
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(void) bindtextdomain (PACKAGE_TARNAME, LOCALEDIR);
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/* Initialize the message catalog. */
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(void) textdomain (PACKAGE_TARNAME);
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/* Parse and process arguments. */
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int remaining;
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(void) argp_parse (&argp, argc, argv, 0, &remaining, NULL);
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/* Tell the library which version we are expecting. */
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elf_version (EV_CURRENT);
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/* Determine the page size. We will likely need it a couple of times. */
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ps = sysconf (_SC_PAGESIZE);
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struct stat st;
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int result = 0;
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if (remaining == argc)
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/* We read from standard input. This we cannot do for a
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structured file. */
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result = read_fd (STDIN_FILENO,
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print_file_name ? "{standard input}" : NULL,
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(fstat (STDIN_FILENO, &st) == 0 && S_ISREG (st.st_mode))
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? st.st_size : INT64_C (0x7fffffffffffffff));
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else
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do
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{
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int fd = (strcmp (argv[remaining], "-") == 0
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? STDIN_FILENO : open (argv[remaining], O_RDONLY));
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if (unlikely (fd == -1))
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{
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error (0, errno, gettext ("cannot open '%s'"), argv[remaining]);
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result = 1;
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}
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else
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{
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const char *fname = print_file_name ? argv[remaining] : NULL;
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int fstat_fail = fstat (fd, &st);
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off_t fdlen = (fstat_fail
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? INT64_C (0x7fffffffffffffff) : st.st_size);
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if (fdlen > (off_t) min_len_bytes)
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{
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Elf *elf = NULL;
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if (entire_file
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|| fstat_fail
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|| !S_ISREG (st.st_mode)
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|| (elf = elf_begin (fd, ELF_C_READ, NULL)) == NULL
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|| elf_kind (elf) != ELF_K_ELF)
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result |= read_fd (fd, fname, fdlen);
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else
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result |= read_elf (elf, fd, fname, fdlen);
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/* This call will succeed even if ELF is NULL. */
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elf_end (elf);
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}
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if (strcmp (argv[remaining], "-") != 0)
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close (fd);
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}
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if (elfmap != NULL && elfmap != MAP_FAILED)
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munmap (elfmap, elfmap_size);
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elfmap = NULL;
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}
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while (++remaining < argc);
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return result;
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}
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/* Handle program arguments. */
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static error_t
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parse_opt (int key, char *arg,
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struct argp_state *state __attribute__ ((unused)))
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{
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switch (key)
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{
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case 'a':
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entire_file = true;
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break;
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case 'e':
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/* We expect a string of one character. */
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switch (arg[1] != '\0' ? '\0' : arg[0])
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{
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case 's':
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case 'S':
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char_7bit = arg[0] == 's';
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bytes_per_char = 1;
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break;
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case 'b':
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case 'B':
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big_endian = true;
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FALLTHROUGH;
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case 'l':
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case 'L':
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bytes_per_char = isupper (arg[0]) ? 4 : 2;
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break;
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default:
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error (0, 0, gettext ("invalid value '%s' for %s parameter"),
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arg, "-e");
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argp_help (&argp, stderr, ARGP_HELP_SEE, "strings");
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return ARGP_ERR_UNKNOWN;
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}
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break;
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case 'f':
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print_file_name = true;
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break;
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case 'n':
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min_len = atoi (arg);
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break;
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case 'o':
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goto octfmt;
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case 't':
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switch (arg[0])
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{
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case 'd':
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radix = radix_decimal;
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break;
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case 'o':
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octfmt:
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radix = radix_octal;
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break;
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case 'x':
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radix = radix_hex;
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break;
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default:
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error (0, 0, gettext ("invalid value '%s' for %s parameter"),
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arg, "-t");
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97d2fb |
argp_help (&argp, stderr, ARGP_HELP_SEE, "strings");
|
|
Packit Service |
97d2fb |
return ARGP_ERR_UNKNOWN;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case ARGP_KEY_FINI:
|
|
Packit Service |
97d2fb |
/* Compute the length in bytes of any match. */
|
|
Packit Service |
97d2fb |
if (min_len <= 0 || min_len > INT_MAX / bytes_per_char)
|
|
Packit Service |
97d2fb |
error (EXIT_FAILURE, 0,
|
|
Packit Service |
97d2fb |
gettext ("invalid minimum length of matched string size"));
|
|
Packit Service |
97d2fb |
min_len_bytes = min_len * bytes_per_char;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
default:
|
|
Packit Service |
97d2fb |
return ARGP_ERR_UNKNOWN;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
return 0;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
static void
|
|
Packit Service |
97d2fb |
process_chunk_mb (const char *fname, const unsigned char *buf, off_t to,
|
|
Packit Service |
97d2fb |
size_t len, char **unprinted)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
size_t curlen = *unprinted == NULL ? 0 : strlen (*unprinted);
|
|
Packit Service |
97d2fb |
const unsigned char *start = buf;
|
|
Packit Service |
97d2fb |
while (len >= bytes_per_char)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
uint32_t ch;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (bytes_per_char == 2)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (big_endian)
|
|
Packit Service |
97d2fb |
ch = buf[0] << 8 | buf[1];
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
ch = buf[1] << 8 | buf[0];
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (big_endian)
|
|
Packit Service |
97d2fb |
ch = buf[0] << 24 | buf[1] << 16 | buf[2] << 8 | buf[3];
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
ch = buf[3] << 24 | buf[2] << 16 | buf[1] << 8 | buf[0];
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (ch <= 255 && (isprint (ch) || ch == '\t'))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
++buf;
|
|
Packit Service |
97d2fb |
++curlen;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (curlen >= min_len)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* We found a match. */
|
|
Packit Service |
97d2fb |
if (unlikely (fname != NULL))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
fputs_unlocked (fname, stdout);
|
|
Packit Service |
97d2fb |
fputs_unlocked (": ", stdout);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (unlikely (radix != radix_none))
|
|
Packit Service |
97d2fb |
printf ((radix == radix_octal ? "%7" PRIo64 " "
|
|
Packit Service |
97d2fb |
: (radix == radix_decimal ? "%7" PRId64 " "
|
|
Packit Service |
97d2fb |
: "%7" PRIx64 " ")),
|
|
Packit Service |
97d2fb |
(int64_t) to - len - (buf - start));
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (unlikely (*unprinted != NULL))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
fputs_unlocked (*unprinted, stdout);
|
|
Packit Service |
97d2fb |
free (*unprinted);
|
|
Packit Service |
97d2fb |
*unprinted = NULL;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* There is no sane way of printing the string. If we
|
|
Packit Service |
97d2fb |
assume the file data is encoded in UCS-2/UTF-16 or
|
|
Packit Service |
97d2fb |
UCS-4/UTF-32 respectively we could covert the string.
|
|
Packit Service |
97d2fb |
But there is no such guarantee. */
|
|
Packit Service |
97d2fb |
fwrite_unlocked (start, 1, buf - start, stdout);
|
|
Packit Service |
97d2fb |
putc_unlocked ('\n', stdout);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
start = ++buf;
|
|
Packit Service |
97d2fb |
curlen = 0;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (len <= min_len)
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
--len;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (curlen != 0)
|
|
Packit Service |
97d2fb |
*unprinted = xstrndup ((const char *) start, curlen);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
static void
|
|
Packit Service |
97d2fb |
process_chunk (const char *fname, const unsigned char *buf, off_t to,
|
|
Packit Service |
97d2fb |
size_t len, char **unprinted)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* We are not going to slow the check down for the 2- and 4-byte
|
|
Packit Service |
97d2fb |
encodings. Handle them special. */
|
|
Packit Service |
97d2fb |
if (unlikely (bytes_per_char != 1))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
process_chunk_mb (fname, buf, to, len, unprinted);
|
|
Packit Service |
97d2fb |
return;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
size_t curlen = *unprinted == NULL ? 0 : strlen (*unprinted);
|
|
Packit Service |
97d2fb |
const unsigned char *start = buf;
|
|
Packit Service |
97d2fb |
while (len > 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if ((isprint (*buf) || *buf == '\t') && (! char_7bit || *buf <= 127))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
++buf;
|
|
Packit Service |
97d2fb |
++curlen;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (curlen >= min_len)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* We found a match. */
|
|
Packit Service |
97d2fb |
if (likely (fname != NULL))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
fputs_unlocked (fname, stdout);
|
|
Packit Service |
97d2fb |
fputs_unlocked (": ", stdout);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (likely (radix != radix_none))
|
|
Packit Service |
97d2fb |
printf ((radix == radix_octal ? "%7" PRIo64 " "
|
|
Packit Service |
97d2fb |
: (radix == radix_decimal ? "%7" PRId64 " "
|
|
Packit Service |
97d2fb |
: "%7" PRIx64 " ")),
|
|
Packit Service |
97d2fb |
(int64_t) to - len - (buf - start));
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (unlikely (*unprinted != NULL))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
fputs_unlocked (*unprinted, stdout);
|
|
Packit Service |
97d2fb |
free (*unprinted);
|
|
Packit Service |
97d2fb |
*unprinted = NULL;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
fwrite_unlocked (start, 1, buf - start, stdout);
|
|
Packit Service |
97d2fb |
putc_unlocked ('\n', stdout);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
start = ++buf;
|
|
Packit Service |
97d2fb |
curlen = 0;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (len <= min_len)
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
--len;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (curlen != 0)
|
|
Packit Service |
97d2fb |
*unprinted = xstrndup ((const char *) start, curlen);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Map a file in as large chunks as possible. */
|
|
Packit Service |
97d2fb |
static void *
|
|
Packit Service |
97d2fb |
map_file (int fd, off_t start_off, off_t fdlen, size_t *map_sizep)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* Maximum size we mmap. We use an #ifdef to avoid overflows on
|
|
Packit Service |
97d2fb |
32-bit machines. 64-bit machines these days do not have usable
|
|
Packit Service |
97d2fb |
address spaces larger than about 43 bits. Not that any file
|
|
Packit Service |
97d2fb |
should be that large. */
|
|
Packit Service |
97d2fb |
# if SIZE_MAX > 0xffffffff
|
|
Packit Service |
97d2fb |
const size_t mmap_max = 0x4000000000lu;
|
|
Packit Service |
97d2fb |
# else
|
|
Packit Service |
97d2fb |
const size_t mmap_max = 0x40000000lu;
|
|
Packit Service |
97d2fb |
# endif
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Try to mmap the file. */
|
|
Packit Service |
97d2fb |
size_t map_size = MIN ((off_t) mmap_max, fdlen);
|
|
Packit Service |
97d2fb |
const size_t map_size_min = MAX (MAX (SIZE_MAX / 16, 2 * ps),
|
|
Packit Service |
97d2fb |
roundup (2 * min_len_bytes + 1, ps));
|
|
Packit Service |
97d2fb |
void *mem;
|
|
Packit Service |
97d2fb |
while (1)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* We map the memory for reading only here. Since we will
|
|
Packit Service |
97d2fb |
always look at every byte of the file it makes sense to
|
|
Packit Service |
97d2fb |
use MAP_POPULATE. */
|
|
Packit Service |
97d2fb |
mem = mmap (NULL, map_size, PROT_READ, MAP_PRIVATE | MAP_POPULATE,
|
|
Packit Service |
97d2fb |
fd, start_off);
|
|
Packit Service |
97d2fb |
if (mem != MAP_FAILED)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* We will go through the mapping sequentially. */
|
|
Packit Service |
97d2fb |
(void) posix_madvise (mem, map_size, POSIX_MADV_SEQUENTIAL);
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
if (errno != EINVAL && errno != ENOMEM)
|
|
Packit Service |
97d2fb |
/* This is an error other than the lack of address space. */
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Maybe the size of the mapping is too big. Try again. */
|
|
Packit Service |
97d2fb |
map_size /= 2;
|
|
Packit Service |
97d2fb |
if (map_size < map_size_min)
|
|
Packit Service |
97d2fb |
/* That size should have fit. */
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
*map_sizep = map_size;
|
|
Packit Service |
97d2fb |
return mem;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Read the file without mapping. */
|
|
Packit Service |
97d2fb |
static int
|
|
Packit Service |
97d2fb |
read_block_no_mmap (int fd, const char *fname, off_t from, off_t fdlen)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
char *unprinted = NULL;
|
|
Packit Service |
97d2fb |
#define CHUNKSIZE 65536
|
|
Packit Service |
97d2fb |
unsigned char *buf = xmalloc (CHUNKSIZE + min_len_bytes
|
|
Packit Service |
97d2fb |
+ bytes_per_char - 1);
|
|
Packit Service |
97d2fb |
size_t ntrailer = 0;
|
|
Packit Service |
97d2fb |
int result = 0;
|
|
Packit Service |
97d2fb |
while (fdlen > 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
ssize_t n = TEMP_FAILURE_RETRY (read (fd, buf + ntrailer,
|
|
Packit Service |
97d2fb |
MIN (fdlen, CHUNKSIZE)));
|
|
Packit Service |
97d2fb |
if (n == 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* There are less than MIN_LEN+1 bytes left so there cannot be
|
|
Packit Service |
97d2fb |
another match. */
|
|
Packit Service |
97d2fb |
assert (unprinted == NULL || ntrailer == 0);
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
if (unlikely (n < 0))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* Something went wrong. */
|
|
Packit Service |
97d2fb |
result = 1;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Account for the number of bytes read in this round. */
|
|
Packit Service |
97d2fb |
fdlen -= n;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Do not use the signed N value. Note that the addition cannot
|
|
Packit Service |
97d2fb |
overflow. */
|
|
Packit Service |
97d2fb |
size_t nb = (size_t) n + ntrailer;
|
|
Packit Service |
97d2fb |
if (nb >= min_len_bytes)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* We only use complete characters. */
|
|
Packit Service |
97d2fb |
nb &= ~(bytes_per_char - 1);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
process_chunk (fname, buf, from + nb, nb, &unprinted);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* If the last bytes of the buffer (modulo the character
|
|
Packit Service |
97d2fb |
size) have been printed we are not copying them. */
|
|
Packit Service |
97d2fb |
size_t to_keep = unprinted != NULL ? 0 : min_len_bytes;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
memmove (buf, buf + nb - to_keep, to_keep);
|
|
Packit Service |
97d2fb |
ntrailer = to_keep;
|
|
Packit Service |
97d2fb |
from += nb;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
ntrailer = nb;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
free (buf);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Don't print anything we collected so far. There is no
|
|
Packit Service |
97d2fb |
terminating NUL byte. */
|
|
Packit Service |
97d2fb |
free (unprinted);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
return result;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
static int
|
|
Packit Service |
97d2fb |
read_block (int fd, const char *fname, off_t fdlen, off_t from, off_t to)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (elfmap == NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* We need a completely new mapping. */
|
|
Packit Service |
97d2fb |
elfmap_off = from & ~(ps - 1);
|
|
Packit Service |
97d2fb |
elfmap_base = elfmap = map_file (fd, elfmap_off, fdlen, &elfmap_size);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (unlikely (elfmap == MAP_FAILED))
|
|
Packit Service |
97d2fb |
/* Let the kernel know we are going to read everything in sequence. */
|
|
Packit Service |
97d2fb |
(void) posix_fadvise (fd, 0, 0, POSIX_FADV_SEQUENTIAL);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (unlikely (elfmap == MAP_FAILED))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* Read from the file descriptor. For this we must position the
|
|
Packit Service |
97d2fb |
read pointer. */
|
|
Packit Service |
97d2fb |
// XXX Eventually add flag which avoids this if the position
|
|
Packit Service |
97d2fb |
// XXX is known to match.
|
|
Packit Service |
97d2fb |
if (from != 0 && lseek (fd, from, SEEK_SET) != from)
|
|
Packit Service |
97d2fb |
error (EXIT_FAILURE, errno, gettext ("lseek failed"));
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97d2fb |
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return read_block_no_mmap (fd, fname, from, to - from);
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}
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97d2fb |
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assert ((off_t) min_len_bytes < fdlen);
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97d2fb |
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97d2fb |
if (to < (off_t) elfmap_off || from > (off_t) (elfmap_off + elfmap_size))
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97d2fb |
{
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/* The existing mapping cannot fit at all. Map the new area.
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We always map the full range of ELFMAP_SIZE bytes even if
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this extend beyond the end of the file. The Linux kernel
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handles this OK if the access pages are not touched. */
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elfmap_off = from & ~(ps - 1);
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if (mmap (elfmap, elfmap_size, PROT_READ,
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MAP_PRIVATE | MAP_POPULATE | MAP_FIXED, fd, from)
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== MAP_FAILED)
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error (EXIT_FAILURE, errno, gettext ("re-mmap failed"));
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elfmap_base = elfmap;
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}
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97d2fb |
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97d2fb |
char *unprinted = NULL;
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97d2fb |
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97d2fb |
/* Use the existing mapping as much as possible. If necessary, map
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97d2fb |
new pages. */
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if (from >= (off_t) elfmap_off
|
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&& from < (off_t) (elfmap_off + elfmap_size))
|
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/* There are at least a few bytes in this mapping which we can
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97d2fb |
use. */
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process_chunk (fname, elfmap_base + (from - elfmap_off),
|
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MIN (to, (off_t) (elfmap_off + elfmap_size)),
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MIN (to, (off_t) (elfmap_off + elfmap_size)) - from,
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97d2fb |
&unprinted);
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97d2fb |
|
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97d2fb |
if (to > (off_t) (elfmap_off + elfmap_size))
|
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97d2fb |
{
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unsigned char *remap_base = elfmap_base;
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size_t read_now = elfmap_size - (elfmap_base - elfmap);
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97d2fb |
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assert (from >= (off_t) elfmap_off
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&& from < (off_t) (elfmap_off + elfmap_size));
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off_t handled_to = elfmap_off + elfmap_size;
|
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assert (elfmap == elfmap_base
|
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|| (elfmap_base - elfmap
|
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== (ptrdiff_t) ((min_len_bytes + ps - 1) & ~(ps - 1))));
|
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if (elfmap == elfmap_base)
|
|
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{
|
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size_t keep_area = (min_len_bytes + ps - 1) & ~(ps - 1);
|
|
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97d2fb |
assert (elfmap_size >= keep_area + ps);
|
|
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97d2fb |
/* The keep area is used for the content of the previous
|
|
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97d2fb |
buffer we have to keep. This means copying those bytes
|
|
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and for this we have to make the data writable. */
|
|
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97d2fb |
if (unlikely (mprotect (elfmap, keep_area, PROT_READ | PROT_WRITE)
|
|
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97d2fb |
!= 0))
|
|
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97d2fb |
error (EXIT_FAILURE, errno, gettext ("mprotect failed"));
|
|
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97d2fb |
|
|
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97d2fb |
elfmap_base = elfmap + keep_area;
|
|
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97d2fb |
}
|
|
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97d2fb |
|
|
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97d2fb |
while (1)
|
|
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97d2fb |
{
|
|
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97d2fb |
/* Map the rest of the file, eventually again in pieces.
|
|
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97d2fb |
We speed things up with a nice Linux feature. Note
|
|
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97d2fb |
that we have at least two pages mapped. */
|
|
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97d2fb |
size_t to_keep = unprinted != NULL ? 0 : min_len_bytes;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
assert (read_now >= to_keep);
|
|
Packit Service |
97d2fb |
memmove (elfmap_base - to_keep,
|
|
Packit Service |
97d2fb |
remap_base + read_now - to_keep, to_keep);
|
|
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97d2fb |
remap_base = elfmap_base;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
assert ((elfmap_size - (elfmap_base - elfmap)) % bytes_per_char
|
|
Packit Service |
97d2fb |
== 0);
|
|
Packit Service |
97d2fb |
read_now = MIN (to - handled_to,
|
|
Packit Service |
97d2fb |
(ptrdiff_t) elfmap_size - (elfmap_base - elfmap));
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
assert (handled_to % ps == 0);
|
|
Packit Service |
97d2fb |
assert (handled_to % bytes_per_char == 0);
|
|
Packit Service |
97d2fb |
if (mmap (remap_base, read_now, PROT_READ,
|
|
Packit Service |
97d2fb |
MAP_PRIVATE | MAP_POPULATE | MAP_FIXED, fd, handled_to)
|
|
Packit Service |
97d2fb |
== MAP_FAILED)
|
|
Packit Service |
97d2fb |
error (EXIT_FAILURE, errno, gettext ("re-mmap failed"));
|
|
Packit Service |
97d2fb |
elfmap_off = handled_to;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
process_chunk (fname, remap_base - to_keep,
|
|
Packit Service |
97d2fb |
elfmap_off + (read_now & ~(bytes_per_char - 1)),
|
|
Packit Service |
97d2fb |
to_keep + (read_now & ~(bytes_per_char - 1)),
|
|
Packit Service |
97d2fb |
&unprinted);
|
|
Packit Service |
97d2fb |
handled_to += read_now;
|
|
Packit Service |
97d2fb |
if (handled_to >= to)
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Don't print anything we collected so far. There is no
|
|
Packit Service |
97d2fb |
terminating NUL byte. */
|
|
Packit Service |
97d2fb |
free (unprinted);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
return 0;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
static int
|
|
Packit Service |
97d2fb |
read_fd (int fd, const char *fname, off_t fdlen)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
return read_block (fd, fname, fdlen, 0, fdlen);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
static int
|
|
Packit Service |
97d2fb |
read_elf (Elf *elf, int fd, const char *fname, off_t fdlen)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
assert (fdlen >= 0);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* We will look at each section separately. The ELF file is not
|
|
Packit Service |
97d2fb |
mmapped. The libelf implementation will load the needed parts on
|
|
Packit Service |
97d2fb |
demand. Since we only interate over the section header table the
|
|
Packit Service |
97d2fb |
memory consumption at this stage is kept minimal. */
|
|
Packit Service |
97d2fb |
Elf_Scn *scn = elf_nextscn (elf, NULL);
|
|
Packit Service |
97d2fb |
if (scn == NULL)
|
|
Packit Service |
97d2fb |
return read_fd (fd, fname, fdlen);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
int result = 0;
|
|
Packit Service |
97d2fb |
do
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
GElf_Shdr shdr_mem;
|
|
Packit Service |
97d2fb |
GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Only look in sections which are loaded at runtime and
|
|
Packit Service |
97d2fb |
actually have content. */
|
|
Packit Service |
97d2fb |
if (shdr != NULL && shdr->sh_type != SHT_NOBITS
|
|
Packit Service |
97d2fb |
&& (shdr->sh_flags & SHF_ALLOC) != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (shdr->sh_offset > (Elf64_Off) fdlen
|
|
Packit Service |
97d2fb |
|| fdlen - shdr->sh_offset < shdr->sh_size)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
size_t strndx = 0;
|
|
Packit Service |
97d2fb |
const char *sname;
|
|
Packit Service |
97d2fb |
if (unlikely (elf_getshdrstrndx (elf, &strndx) < 0))
|
|
Packit Service |
97d2fb |
sname = "<unknown>";
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
sname = elf_strptr (elf, strndx, shdr->sh_name) ?: "<unknown>";
|
|
Packit Service |
97d2fb |
error (0, 0,
|
|
Packit Service |
97d2fb |
gettext ("Skipping section %zd '%s' data outside file"),
|
|
Packit Service |
97d2fb |
elf_ndxscn (scn), sname);
|
|
Packit Service |
97d2fb |
result = 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
result |= read_block (fd, fname, fdlen, shdr->sh_offset,
|
|
Packit Service |
97d2fb |
shdr->sh_offset + shdr->sh_size);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
while ((scn = elf_nextscn (elf, scn)) != NULL);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (elfmap != NULL && elfmap != MAP_FAILED)
|
|
Packit Service |
97d2fb |
munmap (elfmap, elfmap_size);
|
|
Packit Service |
97d2fb |
elfmap = NULL;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
return result;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
#include "debugpred.h"
|