[ctfdump/.git] / ctfdump.c

/*
 * Copyright (c) 2016 Martin Pieuchot <mpi@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/exec_elf.h>
#include <sys/mman.h>

#include <err.h>
#include <fcntl.h>
#include <locale.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#ifdef ZLIB
#include <zlib.h>
#endif /* ZLIB */

#include "ctf.h"

#define SUNW_CTF	".SUNW_ctf"

#define DUMP_OBJECT	(1 << 0)
#define DUMP_FUNCTION	(1 << 1)
#define DUMP_HEADER	(1 << 2)
#define DUMP_LABEL	(1 << 3)

int		 dump(const char *, uint32_t);
int		 iself(const char *, size_t);
int		 isctf(const char *, size_t);
__dead void	 usage(void);

int		 ctf_dump(const char *, size_t, uint32_t);
const char	*ctf_off2name(struct ctf_header *, const char *, off_t,
		     unsigned int);

int		 elf_dump(const char *, size_t, uint32_t);
int		 elf_getshstrtab(const char *, size_t, const char **, size_t *);
int		 elf_getsymtab(const char *, const char *, size_t,
		     const Elf_Sym **, size_t *);
int		 elf_getstrtab(const char *, const char *, size_t,
		     const char **, size_t *);

#ifdef ZLIB
char		*decompress(const char *, size_t, off_t);
#endif /* ZLIB */

int
main(int argc, char *argv[])
{
	const char *filename;
	uint32_t flags = 0;
	int ch, error = 0;

	setlocale(LC_ALL, "");

	while ((ch = getopt(argc, argv, "dfhlsSt")) != -1) {
		switch (ch) {
		case 'h':
			flags |= DUMP_HEADER;
			break;
		case 'l':
			flags |= DUMP_LABEL;
			break;
		default:
			usage();
		}
	}

	argc -= optind;
	argv += optind;

	while ((filename = *argv++) != NULL)
		error |= dump(filename, flags);

	return error;
}

int
dump(const char *path, uint32_t flags)
{
	struct stat		 st;
	int			 fd, error = 1;
	char			*p;

	fd = open(path, O_RDONLY);
	if (fd == -1) {
		warn("open");
		return 1;
	}
	if (fstat(fd, &st) == -1) {
		warn("fstat");
		return 1;
	}
	if (st.st_size < (off_t)sizeof(struct ctf_header)) {
		warnx("file too small to be CTF");
		return 1;
	}
	if ((uintmax_t)st.st_size > SIZE_MAX) {
		warnx("file too big to fit memory");
		return 1;
	}

	p = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
	if (p == MAP_FAILED)
		err(1, "mmap");

	if (iself(p, st.st_size)) {
		error = elf_dump(p, st.st_size, flags);
	} else if (isctf(p, st.st_size)) {
		error = ctf_dump(p, st.st_size, flags);
	}

	munmap(p, st.st_size);
	close(fd);

	return error;
}

int
iself(const char *p, size_t filesize)
{
	Elf_Ehdr		*eh = (Elf_Ehdr *)p;

	if (eh->e_ehsize < sizeof(Elf_Ehdr) || !IS_ELF(*eh)) {
		warnx("file is not ELF");
		return 0;
	}
	if (eh->e_ident[EI_CLASS] != ELFCLASS) {
		warnx("unexpected word size %u", eh->e_ident[EI_CLASS]);
		return 0;
	}
	if (eh->e_ident[EI_VERSION] != ELF_TARG_VER) {
		warnx("unexpected version %u", eh->e_ident[EI_VERSION]);
		return 0;
	}
	if (eh->e_ident[EI_DATA] >= ELFDATANUM) {
		warnx("unexpected data format %u", eh->e_ident[EI_DATA]);
		return 0;
	}
	if (eh->e_shoff > filesize) {
		warnx("bogus section table offset 0x%llx", eh->e_shoff);
		return 0;
	}
	if (eh->e_shentsize < sizeof(Elf_Shdr)) {
		warnx("bogus section header size %u", eh->e_shentsize);
		return 0;
	}
	if (eh->e_shnum > (filesize - eh->e_shoff) / eh->e_shentsize) {
		warnx("bogus section header count %u", eh->e_shnum);
		return 0;
	}
	if (eh->e_shstrndx >= eh->e_shnum) {
		warnx("bogus string table index %u", eh->e_shstrndx);
		return 0;
	}

	return 1;
}

int
elf_getshstrtab(const char *p, size_t filesize, const char **shstrtab,
    size_t *shstrtabsize)
{
	Elf_Ehdr		*eh = (Elf_Ehdr *)p;
	Elf_Shdr		*sh;

	sh = (Elf_Shdr *)(p + eh->e_shoff + eh->e_shstrndx * eh->e_shentsize);
	if (sh->sh_type != SHT_STRTAB) {
		warnx("unexpected string table type");
		return 1;
	}
	if (sh->sh_offset > filesize) {
		warnx("bogus string table offset");
		return 1;
	}
	if (sh->sh_size > filesize - sh->sh_offset) {
		warnx("bogus string table size");
		return 1;
	}
	if (shstrtab != NULL)
		*shstrtab = p + sh->sh_offset;
	if (shstrtabsize != NULL)
		*shstrtabsize = sh->sh_size;

	return 0;
}

int
elf_getsymtab(const char *p, const char *shstrtab, size_t shstrtabsize,
    const Elf_Sym **symtab, size_t *nsymb)
{
	Elf_Ehdr	*eh = (Elf_Ehdr *)p;
	Elf_Shdr	*sh;
	size_t		 i;

	for (i = 0; i < eh->e_shnum; i++) {
		sh = (Elf_Shdr *)(p + eh->e_shoff + i * eh->e_shentsize);

		if (sh->sh_type != SHT_SYMTAB)
			continue;

		if ((sh->sh_link >= eh->e_shnum) ||
		    (sh->sh_name >= shstrtabsize))
			continue;

		if (strncmp(shstrtab + sh->sh_name, ELF_SYMTAB,
		    strlen(ELF_SYMTAB)) == 0) {
			if (symtab != NULL)
				*symtab = (Elf_Sym *)(p + sh->sh_offset);
			if (nsymb != NULL)
				*nsymb = (sh->sh_size / sh->sh_entsize);

			return 0;
		}
	}

	return 1;
}

int
elf_getstrtab(const char *p, const char *shstrtab, size_t shstrtabsize,
    const char **strtab, size_t *strtabsize)
{
	Elf_Ehdr	*eh = (Elf_Ehdr *)p;
	Elf_Shdr	*sh;
	size_t		 i;

	for (i = 0; i < eh->e_shnum; i++) {
		sh = (Elf_Shdr *)(p + eh->e_shoff + i * eh->e_shentsize);

		if (sh->sh_type != SHT_STRTAB)
			continue;

		if ((sh->sh_link >= eh->e_shnum) ||
		    (sh->sh_name >= shstrtabsize))
			continue;

		if (strncmp(shstrtab + sh->sh_name, ELF_STRTAB,
		    strlen(ELF_STRTAB)) == 0) {
			if (strtab != NULL)
				*strtab = p + sh->sh_offset;
			if (strtabsize != NULL)
				*strtabsize = sh->sh_size;

			return 0;
		}
	}

	return 1;
}

const char		*strtab;
const Elf_Sym		*symtab;
size_t			 strtabsize, nsymb;

int
elf_dump(const char *p, size_t filesize, uint32_t flags)
{
	Elf_Ehdr		*eh = (Elf_Ehdr *)p;
	Elf_Shdr		*sh;
	const char		*shstrtab;
	size_t			 i, shstrtabsize;

	/* Find section header string table location and size. */
	if (elf_getshstrtab(p, filesize, &shstrtab, &shstrtabsize))
		return 1;

	/* Find symbol table location and number of symbols. */
	if (elf_getsymtab(p, shstrtab, shstrtabsize, &symtab, &nsymb))
		warnx("symbol table not found");

	/* Find string table location and size. */
	if (elf_getstrtab(p, shstrtab, shstrtabsize, &strtab, &strtabsize))
		warnx("string table not found");

	/* Find CTF section and dump it. */
	for (i = 0; i < eh->e_shnum; i++) {
		sh = (Elf_Shdr *)(p + eh->e_shoff + i * eh->e_shentsize);

		if ((sh->sh_link >= eh->e_shnum) ||
		    (sh->sh_name >= shstrtabsize))
			continue;

		if (strncmp(shstrtab + sh->sh_name, SUNW_CTF, strlen(SUNW_CTF)))
			continue;

		if (!isctf(p + sh->sh_offset, sh->sh_size))
			break;

		return ctf_dump(p + sh->sh_offset, sh->sh_size, flags);
	}

	warnx("%s section not found", SUNW_CTF);
	return 1;
}

int
isctf(const char *p, size_t filesize)
{
	struct ctf_header	*cth = (struct ctf_header *)p;
	off_t 			 dlen = cth->cth_stroff + cth->cth_strlen;

	if (cth->cth_magic != CTF_MAGIC || cth->cth_version != CTF_VERSION)
		return 0;

	if (dlen > filesize && !(cth->cth_flags & CTF_F_COMPRESS)) {
		warnx("bogus file size");
		return 0;
	}

	if ((cth->cth_lbloff & 3) || (cth->cth_objtoff & 1) ||
	    (cth->cth_funcoff & 1) || (cth->cth_typeoff & 3)) {
		warnx("wrongly aligned offset");
		return 0;
	}

	if ((cth->cth_lbloff >= dlen) || (cth->cth_objtoff >= dlen) ||
	    (cth->cth_funcoff >= dlen) || (cth->cth_typeoff >= dlen)) {
		warnx("truncated file");
		return 0;
	}

	if ((cth->cth_lbloff > cth->cth_objtoff) ||
	    (cth->cth_objtoff > cth->cth_funcoff) ||
	    (cth->cth_funcoff > cth->cth_typeoff) ||
	    (cth->cth_typeoff > cth->cth_stroff)) {
		warnx("corrupted file");
		return 0;
	}

	return 1;
}

int
ctf_dump(const char *p, size_t size, uint32_t flags)
{
	struct ctf_header	*cth = (struct ctf_header *)p;
	char			*data = (char *)p;
	off_t 			 dlen = cth->cth_stroff + cth->cth_strlen;

	if (cth->cth_flags & CTF_F_COMPRESS) {
		data = decompress(p + sizeof(*cth), size - sizeof(*cth), dlen);
		if (data == NULL)
			return 1;
	}

	if (flags & DUMP_HEADER) {
		printf("cth_magic    = 0x%04x\n", cth->cth_magic);
		printf("cth_version  = %d\n", cth->cth_version);
		printf("cth_flags    = 0x%02x\n", cth->cth_flags);
		printf("cth_parlabel = %s\n",
		    ctf_off2name(cth, data, dlen, cth->cth_parname));
		printf("cth_parname  = %s\n",
		    ctf_off2name(cth, data, dlen, cth->cth_parname));
		printf("cth_lbloff   = %d\n", cth->cth_lbloff);
		printf("cth_objtoff  = %d\n", cth->cth_objtoff);
		printf("cth_funcoff  = %d\n", cth->cth_funcoff);
		printf("cth_typeoff  = %d\n", cth->cth_typeoff);
		printf("cth_stroff   = %d\n", cth->cth_stroff);
		printf("cth_strlen   = %d\n", cth->cth_strlen);
	}

	if (flags & DUMP_LABEL) {
		unsigned int		 lbloff = cth->cth_lbloff;
		struct ctf_lblent	*ctl;

		while (lbloff < cth->cth_objtoff) {
			ctl = (struct ctf_lblent *)(data + lbloff);

			printf("%5u %s\n", ctl->ctl_typeidx,
			    ctf_off2name(cth, data, dlen, ctl->ctl_label));

			lbloff += sizeof(*ctl);
		}
	}

	if (cth->cth_flags & CTF_F_COMPRESS)
		free(data);

	return 0;
}

const char *
ctf_off2name(struct ctf_header *cth, const char *data, off_t dlen,
    unsigned int offset)
{
	const char		*name;

	if (CTF_NAME_STID(offset) != CTF_STRTAB_0)
		return "external";

	if (CTF_NAME_OFFSET(offset) >= cth->cth_strlen)
		return "exceeds strlab";

	if (cth->cth_stroff + CTF_NAME_OFFSET(offset) >= dlen)
		return "invalid";

	name = data + cth->cth_stroff + CTF_NAME_OFFSET(offset);
	if (*name == '\0')
		return "(anon)";

	return name;
}

char *
decompress(const char *buf, size_t size, off_t len)
{
#ifdef ZLIB
	z_stream		 stream;
	char			*data;
	int			 error;

	data = malloc(len);
	if (data == NULL) {
		warn(NULL);
		return NULL;
	}

	memset(&stream, 0, sizeof(stream));
	stream.next_in = (void *)buf;
	stream.avail_in = size;
	stream.next_out = data;
	stream.avail_out = len;

	if ((error = inflateInit(&stream)) != Z_OK) {
		warnx("zlib inflateInit failed: %s", zError(error));
		goto exit;
	}

	if ((error = inflate(&stream, Z_FINISH)) != Z_STREAM_END) {
		warnx("zlib inflate failed: %s", zError(error));
		goto exit;
	}

	if ((error = inflateEnd(&stream)) != Z_OK) {
		warnx("zlib inflateEnd failed: %s", zError(error));
		goto exit;
	}

	if (stream.total_out != len) {
		warnx("decompression failed: %llu != %llu",
		    stream.total_out, len);
		goto exit;
	}

	return data;

exit:
	free(data);
#endif /* ZLIB */
	return NULL;
}

__dead void
usage(void)
{
	extern char		*__progname;

	fprintf(stderr, "usage: %s [-dfhlsSt] [file ...]\n",
	    __progname);
	exit(1);
}
Commit	Line	Data
f8621c6a MP	1	/*
	2	* Copyright (c) 2016 Martin Pieuchot <mpi@openbsd.org>
	3	*
	4	* Permission to use, copy, modify, and distribute this software for any
	5	* purpose with or without fee is hereby granted, provided that the above
	6	* copyright notice and this permission notice appear in all copies.
	7	*
	8	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	9	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	10	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	11	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	12	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	13	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	14	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	15	*/
	16
	17	#include <sys/param.h>
	18	#include <sys/types.h>
	19	#include <sys/stat.h>
	20	#include <sys/exec_elf.h>
	21	#include <sys/mman.h>
	22
	23	#include <err.h>
	24	#include <fcntl.h>
	25	#include <locale.h>
	26	#include <stdio.h>
	27	#include <stdint.h>
	28	#include <stdlib.h>
	29	#include <string.h>
	30	#include <unistd.h>
	31
	32	#ifdef ZLIB
	33	#include <zlib.h>
	34	#endif /* ZLIB */
	35
	36	#include "ctf.h"
	37
	38	#define SUNW_CTF ".SUNW_ctf"
	39
	40	#define DUMP_OBJECT (1 << 0)
	41	#define DUMP_FUNCTION (1 << 1)
	42	#define DUMP_HEADER (1 << 2)
751fc09a	43	#define DUMP_LABEL (1 << 3)
f8621c6a MP	44
	45	int dump(const char *, uint32_t);
	46	int iself(const char *, size_t);
	47	int isctf(const char *, size_t);
	48	__dead void usage(void);
	49
	50	int ctf_dump(const char *, size_t, uint32_t);
	51	const char ctf_off2name(struct ctf_header , const char *, off_t,
	52	unsigned int);
	53
	54	int elf_dump(const char *, size_t, uint32_t);
	55	int elf_getshstrtab(const char , size_t, const char , size_t );
	56	int elf_getsymtab(const char , const char , size_t,
	57	const Elf_Sym *, size_t );
	58	int elf_getstrtab(const char , const char , size_t,
	59	const char *, size_t );
	60
	61	#ifdef ZLIB
	62	char decompress(const char , size_t, off_t);
	63	#endif /* ZLIB */
	64
	65	int
	66	main(int argc, char *argv[])
	67	{
	68	const char *filename;
	69	uint32_t flags = 0;
	70	int ch, error = 0;
	71
	72	setlocale(LC_ALL, "");
	73
	74	while ((ch = getopt(argc, argv, "dfhlsSt")) != -1) {
	75	switch (ch) {
	76	case 'h':
	77	flags \|= DUMP_HEADER;
	78	break;
751fc09a MP	79	case 'l':
	80	flags \|= DUMP_LABEL;
	81	break;
f8621c6a MP	82	default:
	83	usage();
	84	}
	85	}
	86
	87	argc -= optind;
	88	argv += optind;
	89
	90	while ((filename = *argv++) != NULL)
	91	error \|= dump(filename, flags);
	92
	93	return error;
	94	}
	95
	96	int
	97	dump(const char *path, uint32_t flags)
	98	{
	99	struct stat st;
	100	int fd, error = 1;
	101	char *p;
	102
	103	fd = open(path, O_RDONLY);
	104	if (fd == -1) {
	105	warn("open");
	106	return 1;
	107	}
	108	if (fstat(fd, &st) == -1) {
	109	warn("fstat");
	110	return 1;
	111	}
	112	if (st.st_size < (off_t)sizeof(struct ctf_header)) {
	113	warnx("file too small to be CTF");
	114	return 1;
	115	}
	116	if ((uintmax_t)st.st_size > SIZE_MAX) {
	117	warnx("file too big to fit memory");
	118	return 1;
	119	}
	120
	121	p = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
	122	if (p == MAP_FAILED)
	123	err(1, "mmap");
	124
	125	if (iself(p, st.st_size)) {
	126	error = elf_dump(p, st.st_size, flags);
	127	} else if (isctf(p, st.st_size)) {
	128	error = ctf_dump(p, st.st_size, flags);
	129	}
	130
	131	munmap(p, st.st_size);
	132	close(fd);
	133
	134	return error;
	135	}
	136
	137	int
	138	iself(const char *p, size_t filesize)
	139	{
	140	Elf_Ehdr eh = (Elf_Ehdr )p;
	141
	142	if (eh->e_ehsize < sizeof(Elf_Ehdr) \|\| !IS_ELF(*eh)) {
	143	warnx("file is not ELF");
	144	return 0;
	145	}
146	if (eh->e_ident[EI_CLASS] != ELFCLASS) {
147	warnx("unexpected word size %u", eh->e_ident[EI_CLASS]);
148	return 0;
149	}
150	if (eh->e_ident[EI_VERSION] != ELF_TARG_VER) {
151	warnx("unexpected version %u", eh->e_ident[EI_VERSION]);
152	return 0;
153	}
154	if (eh->e_ident[EI_DATA] >= ELFDATANUM) {
155	warnx("unexpected data format %u", eh->e_ident[EI_DATA]);
156	return 0;
157	}
158	if (eh->e_shoff > filesize) {
159	warnx("bogus section table offset 0x%llx", eh->e_shoff);
160	return 0;
161	}
162	if (eh->e_shentsize < sizeof(Elf_Shdr)) {
163	warnx("bogus section header size %u", eh->e_shentsize);
164	return 0;
165	}
166	if (eh->e_shnum > (filesize - eh->e_shoff) / eh->e_shentsize) {
167	warnx("bogus section header count %u", eh->e_shnum);
168	return 0;
169	}
170	if (eh->e_shstrndx >= eh->e_shnum) {
171	warnx("bogus string table index %u", eh->e_shstrndx);
172	return 0;
173	}
174
175	return 1;
176	}
177
178	int
179	elf_getshstrtab(const char p, size_t filesize, const char *shstrtab,
180	size_t *shstrtabsize)
181	{
182	Elf_Ehdr eh = (Elf_Ehdr )p;
183	Elf_Shdr *sh;
184
185	sh = (Elf_Shdr )(p + eh->e_shoff + eh->e_shstrndx eh->e_shentsize);
186	if (sh->sh_type != SHT_STRTAB) {
187	warnx("unexpected string table type");
188	return 1;
189	}
190	if (sh->sh_offset > filesize) {
191	warnx("bogus string table offset");
192	return 1;
193	}
194	if (sh->sh_size > filesize - sh->sh_offset) {
195	warnx("bogus string table size");
196	return 1;
197	}
198	if (shstrtab != NULL)
199	*shstrtab = p + sh->sh_offset;
200	if (shstrtabsize != NULL)
201	*shstrtabsize = sh->sh_size;
202
203	return 0;
204	}
205
206	int
207	elf_getsymtab(const char p, const char shstrtab, size_t shstrtabsize,
208	const Elf_Sym *symtab, size_t nsymb)
209	{
210	Elf_Ehdr eh = (Elf_Ehdr )p;
211	Elf_Shdr *sh;
212	size_t i;
213
214	for (i = 0; i < eh->e_shnum; i++) {
215	sh = (Elf_Shdr )(p + eh->e_shoff + i eh->e_shentsize);
216
217	if (sh->sh_type != SHT_SYMTAB)
218	continue;
219
220	if ((sh->sh_link >= eh->e_shnum) \|\|
221	(sh->sh_name >= shstrtabsize))
222	continue;
223
224	if (strncmp(shstrtab + sh->sh_name, ELF_SYMTAB,
225	strlen(ELF_SYMTAB)) == 0) {
226	if (symtab != NULL)
227	symtab = (Elf_Sym )(p + sh->sh_offset);
228	if (nsymb != NULL)
229	*nsymb = (sh->sh_size / sh->sh_entsize);
230
231	return 0;
232	}
233	}
234
235	return 1;
236	}
237
238	int
239	elf_getstrtab(const char p, const char shstrtab, size_t shstrtabsize,
240	const char *strtab, size_t strtabsize)
241	{
242	Elf_Ehdr eh = (Elf_Ehdr )p;
243	Elf_Shdr *sh;
244	size_t i;
245
246	for (i = 0; i < eh->e_shnum; i++) {
247	sh = (Elf_Shdr )(p + eh->e_shoff + i eh->e_shentsize);
248
249	if (sh->sh_type != SHT_STRTAB)
250	continue;
251
252	if ((sh->sh_link >= eh->e_shnum) \|\|
253	(sh->sh_name >= shstrtabsize))
254	continue;
255
256	if (strncmp(shstrtab + sh->sh_name, ELF_STRTAB,
257	strlen(ELF_STRTAB)) == 0) {
258	if (strtab != NULL)
259	*strtab = p + sh->sh_offset;
260	if (strtabsize != NULL)
261	*strtabsize = sh->sh_size;
262
263	return 0;
264	}
265	}
266
267	return 1;
268	}
269
270	const char *strtab;
271	const Elf_Sym *symtab;
272	size_t strtabsize, nsymb;
273
274	int
275	elf_dump(const char *p, size_t filesize, uint32_t flags)
276	{
277	Elf_Ehdr eh = (Elf_Ehdr )p;
278	Elf_Shdr *sh;
279	const char *shstrtab;
280	size_t i, shstrtabsize;
281
282	/* Find section header string table location and size. */
283	if (elf_getshstrtab(p, filesize, &shstrtab, &shstrtabsize))
284	return 1;
285
286	/* Find symbol table location and number of symbols. */
287	if (elf_getsymtab(p, shstrtab, shstrtabsize, &symtab, &nsymb))
288	warnx("symbol table not found");
289
290	/* Find string table location and size. */
291	if (elf_getstrtab(p, shstrtab, shstrtabsize, &strtab, &strtabsize))
292	warnx("string table not found");
293
294	/* Find CTF section and dump it. */
295	for (i = 0; i < eh->e_shnum; i++) {
296	sh = (Elf_Shdr )(p + eh->e_shoff + i eh->e_shentsize);
297
298	if ((sh->sh_link >= eh->e_shnum) \|\|
299	(sh->sh_name >= shstrtabsize))
300	continue;
301
302	if (strncmp(shstrtab + sh->sh_name, SUNW_CTF, strlen(SUNW_CTF)))
303	continue;
304
305	if (!isctf(p + sh->sh_offset, sh->sh_size))
306	break;
307
308	return ctf_dump(p + sh->sh_offset, sh->sh_size, flags);
309	}
310
311	warnx("%s section not found", SUNW_CTF);
312	return 1;
313	}
314
315	int
316	isctf(const char *p, size_t filesize)
317	{
318	struct ctf_header cth = (struct ctf_header )p;
319	off_t dlen = cth->cth_stroff + cth->cth_strlen;
320
321	if (cth->cth_magic != CTF_MAGIC \|\| cth->cth_version != CTF_VERSION)
322	return 0;
323
324	if (dlen > filesize && !(cth->cth_flags & CTF_F_COMPRESS)) {
325	warnx("bogus file size");
326	return 0;
327	}
328
329	if ((cth->cth_lbloff & 3) \|\| (cth->cth_objtoff & 1) \|\|
330	(cth->cth_funcoff & 1) \|\| (cth->cth_typeoff & 3)) {
331	warnx("wrongly aligned offset");
332	return 0;
333	}
334
335	if ((cth->cth_lbloff >= dlen) \|\| (cth->cth_objtoff >= dlen) \|\|
336	(cth->cth_funcoff >= dlen) \|\| (cth->cth_typeoff >= dlen)) {
337	warnx("truncated file");
338	return 0;
339	}
340
341	if ((cth->cth_lbloff > cth->cth_objtoff) \|\|
342	(cth->cth_objtoff > cth->cth_funcoff) \|\|
343	(cth->cth_funcoff > cth->cth_typeoff) \|\|
344	(cth->cth_typeoff > cth->cth_stroff)) {
345	warnx("corrupted file");
346	return 0;
347	}
348
349	return 1;
350	}
351
352	int
353	ctf_dump(const char *p, size_t size, uint32_t flags)
354	{
355	struct ctf_header cth = (struct ctf_header )p;
356	char data = (char )p;
357	off_t dlen = cth->cth_stroff + cth->cth_strlen;
358
359	if (cth->cth_flags & CTF_F_COMPRESS) {
360	data = decompress(p + sizeof(cth), size - sizeof(cth), dlen);
361	if (data == NULL)
362	return 1;
363	}
364
365	if (flags & DUMP_HEADER) {
366	printf("cth_magic = 0x%04x\n", cth->cth_magic);
367	printf("cth_version = %d\n", cth->cth_version);
368	printf("cth_flags = 0x%02x\n", cth->cth_flags);
369	printf("cth_parlabel = %s\n",
370	ctf_off2name(cth, data, dlen, cth->cth_parname));
371	printf("cth_parname = %s\n",
372	ctf_off2name(cth, data, dlen, cth->cth_parname));
373	printf("cth_lbloff = %d\n", cth->cth_lbloff);
374	printf("cth_objtoff = %d\n", cth->cth_objtoff);
375	printf("cth_funcoff = %d\n", cth->cth_funcoff);
376	printf("cth_typeoff = %d\n", cth->cth_typeoff);
377	printf("cth_stroff = %d\n", cth->cth_stroff);
378	printf("cth_strlen = %d\n", cth->cth_strlen);
379	}
380
751fc09a MP	381	if (flags & DUMP_LABEL) {
	382	unsigned int lbloff = cth->cth_lbloff;
	383	struct ctf_lblent *ctl;
	384
	385	while (lbloff < cth->cth_objtoff) {
	386	ctl = (struct ctf_lblent *)(data + lbloff);
	387
	388	printf("%5u %s\n", ctl->ctl_typeidx,
	389	ctf_off2name(cth, data, dlen, ctl->ctl_label));
	390
	391	lbloff += sizeof(*ctl);
	392	}
	393	}
	394
f8621c6a MP	395	if (cth->cth_flags & CTF_F_COMPRESS)
	396	free(data);
	397
	398	return 0;
	399	}
	400
	401	const char *
	402	ctf_off2name(struct ctf_header cth, const char data, off_t dlen,
	403	unsigned int offset)
	404	{
	405	const char *name;
	406
	407	if (CTF_NAME_STID(offset) != CTF_STRTAB_0)
	408	return "external";
	409
	410	if (CTF_NAME_OFFSET(offset) >= cth->cth_strlen)
	411	return "exceeds strlab";
	412
	413	if (cth->cth_stroff + CTF_NAME_OFFSET(offset) >= dlen)
	414	return "invalid";
	415
	416	name = data + cth->cth_stroff + CTF_NAME_OFFSET(offset);
	417	if (*name == '\0')
	418	return "(anon)";
	419
	420	return name;
	421	}
	422
	423	char *
	424	decompress(const char *buf, size_t size, off_t len)
	425	{
	426	#ifdef ZLIB
	427	z_stream stream;
	428	char *data;
	429	int error;
	430
	431	data = malloc(len);
	432	if (data == NULL) {
	433	warn(NULL);
	434	return NULL;
	435	}
	436
	437	memset(&stream, 0, sizeof(stream));
	438	stream.next_in = (void *)buf;
	439	stream.avail_in = size;
	440	stream.next_out = data;
	441	stream.avail_out = len;
	442
	443	if ((error = inflateInit(&stream)) != Z_OK) {
	444	warnx("zlib inflateInit failed: %s", zError(error));
	445	goto exit;
	446	}
	447
	448	if ((error = inflate(&stream, Z_FINISH)) != Z_STREAM_END) {
	449	warnx("zlib inflate failed: %s", zError(error));
	450	goto exit;
	451	}
	452
	453	if ((error = inflateEnd(&stream)) != Z_OK) {
	454	warnx("zlib inflateEnd failed: %s", zError(error));
	455	goto exit;
	456	}
	457
	458	if (stream.total_out != len) {
459	warnx("decompression failed: %llu != %llu",
460	stream.total_out, len);
461	goto exit;
462	}
463
464	return data;
465
466	exit:
467	free(data);
468	#endif /* ZLIB */
469	return NULL;
470	}
471
472	__dead void
473	usage(void)
474	{
475	extern char *__progname;
476
477	fprintf(stderr, "usage: %s [-dfhlsSt] [file ...]\n",
478	__progname);
479	exit(1);
480	}
481