[elfdbg/.git] / elfdbg.c

/*-
 * Copyright (c) 2015 Sofian Brabez <sbz@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer
 *    in this position and unchanged.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#include <err.h>
#include <fcntl.h>
#include <gelf.h>
#include <stdint.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <sysexits.h>
#include <unistd.h>

static int
elf_debug_sections(Elf *e)
{
	Elf_Scn *scn = NULL;
	GElf_Shdr shdr;
	size_t n, shstrndx, sz;
	char *name;
	int has_debug = 0;

	if (elf_getshdrstrndx(e, &shstrndx) != 0)
		errx(EX_SOFTWARE, "elf_getshdrstrndx() failed : %s . ",
		    elf_errmsg(-1));

	while ((scn = elf_nextscn(e, scn)) != NULL) {
		gelf_getshdr(scn, &shdr);

		name = elf_strptr(e, shstrndx, shdr.sh_name);
		if (!strstr(name, "debug_"))
			continue;

		has_debug++;
	}

	return (has_debug > 0);
}

int
main(int argc, char *argv[])
{
	int fd, rc;
	Elf *e;
	int has_debug;

	if (elf_version(EV_CURRENT) == EV_NONE)
		errx(EX_SOFTWARE, "ELF library initialization failed : %s ",
		    elf_errmsg(-1));

	if ((fd = open(argv[1], O_RDONLY, 0)) < 0)
		err(EX_NOINPUT, "open %s failed ", argv[1]);
	if ((e = elf_begin(fd, ELF_C_READ, NULL)) == NULL)
		errx(EX_SOFTWARE, "elf_begin() failed : %s", elf_errmsg(-1));
	if (elf_kind(e) != ELF_K_ELF)
		errx(EX_DATAERR, "%s is not an ELF object", argv[1]);

	has_debug = elf_debug_sections(e);
	printf(has_debug ? "HAS DEBUG\n" : "NO DEBUG\n");

	rc = close(fd);
	rc = elf_end(e);

	return (rc);
}
Commit	Line	Data
f4b470b9 SB	1	/*-
	2	* Copyright (c) 2015 Sofian Brabez <sbz@FreeBSD.org>
	3	* All rights reserved.
3131de8b	4	*
f4b470b9 SB	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer
	10	* in this position and unchanged.
	11	* 2. Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
3131de8b	14	*
f4b470b9 SB	15	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
	16	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	17	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	18	* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
	19	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	20	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	21	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	22	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	23	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	24	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	25	*/
	26	#include <err.h>
	27	#include <fcntl.h>
	28	#include <gelf.h>
	29	#include <stdint.h>
	30	#include <string.h>
	31	#include <stdio.h>
	32	#include <stdlib.h>
	33	#include <sysexits.h>
	34	#include <unistd.h>
	35
	36	static int
3131de8b SB	37	elf_debug_sections(Elf *e)
	38	{
	39	Elf_Scn *scn = NULL;
	40	GElf_Shdr shdr;
	41	size_t n, shstrndx, sz;
	42	char *name;
	43	int has_debug = 0;
f4b470b9	44
3131de8b SB	45	if (elf_getshdrstrndx(e, &shstrndx) != 0)
	46	errx(EX_SOFTWARE, "elf_getshdrstrndx() failed : %s . ",
	47	elf_errmsg(-1));
f4b470b9	48
3131de8b SB	49	while ((scn = elf_nextscn(e, scn)) != NULL) {
3131de8b SB	50	gelf_getshdr(scn, &shdr);
f4b470b9	51
3131de8b SB	52	name = elf_strptr(e, shstrndx, shdr.sh_name);
	53	if (!strstr(name, "debug_"))
	54	continue;
f4b470b9	55
3131de8b SB	56	has_debug++;
3131de8b SB	57	}
f4b470b9	58
3131de8b	59	return (has_debug > 0);
f4b470b9 SB	60	}
f4b470b9 SB	61
3131de8b SB	62	int
	63	main(int argc, char *argv[])
	64	{
	65	int fd, rc;
	66	Elf *e;
	67	int has_debug;
f4b470b9	68
3131de8b SB	69	if (elf_version(EV_CURRENT) == EV_NONE)
	70	errx(EX_SOFTWARE, "ELF library initialization failed : %s ",
	71	elf_errmsg(-1));
f4b470b9	72
3131de8b SB	73	if ((fd = open(argv[1], O_RDONLY, 0)) < 0)
	74	err(EX_NOINPUT, "open %s failed ", argv[1]);
	75	if ((e = elf_begin(fd, ELF_C_READ, NULL)) == NULL)
	76	errx(EX_SOFTWARE, "elf_begin() failed : %s", elf_errmsg(-1));
	77	if (elf_kind(e) != ELF_K_ELF)
	78	errx(EX_DATAERR, "%s is not an ELF object", argv[1]);
f4b470b9	79
3131de8b SB	80	has_debug = elf_debug_sections(e);
3131de8b SB	81	printf(has_debug ? "HAS DEBUG\n" : "NO DEBUG\n");
f4b470b9	82
3131de8b SB	83	rc = close(fd);
3131de8b SB	84	rc = elf_end(e);
f4b470b9 SB	85
	86	return (rc);
	87	}