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/*
* Copyright (c) Ian F. Darwin 1986-1995.
* Software written by Ian F. Darwin and others;
* maintained 1995-present by Christos Zoulas and others.
*
* 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 immediately at the beginning of the file, without modification,
* this list of conditions, and the following disclaimer.
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*/
/*
* compress routines:
* zmagic() - returns 0 if not recognized, uncompresses and prints
* information if recognized
* uncompress(method, old, n, newch) - uncompress old into new,
* using method, return sizeof new
*/
#include "file.h"
#ifndef lint
FILE_RCSID("@(#)$File: compress.c,v 1.113 2018/10/15 16:29:16 christos Exp $")
#endif
#include "magic.h"
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <stdarg.h>
#include <signal.h>
#ifndef HAVE_SIG_T
typedef void (*sig_t)(int);
#endif /* HAVE_SIG_T */
#if !defined(__MINGW32__) && !defined(WIN32)
#include <sys/ioctl.h>
#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#if defined(HAVE_SYS_TIME_H)
#include <sys/time.h>
#endif
#if defined(HAVE_ZLIB_H) && defined(ZLIBSUPPORT)
#define BUILTIN_DECOMPRESS
#include <zlib.h>
#endif
#if defined(HAVE_BZLIB_H)
#define BUILTIN_BZLIB
#include <bzlib.h>
#endif
#ifdef DEBUG
int tty = -1;
#define DPRINTF(...) do { \
if (tty == -1) \
tty = open("/dev/tty", O_RDWR); \
if (tty == -1) \
abort(); \
dprintf(tty, __VA_ARGS__); \
} while (/*CONSTCOND*/0)
#else
#define DPRINTF(...)
#endif
#ifdef ZLIBSUPPORT
/*
* The following python code is not really used because ZLIBSUPPORT is only
* defined if we have a built-in zlib, and the built-in zlib handles that.
* That is not true for android where we have zlib.h and not -lz.
*/
static const char zlibcode[] =
"import sys, zlib; sys.stdout.write(zlib.decompress(sys.stdin.read()))";
static const char *zlib_args[] = { "python", "-c", zlibcode, NULL };
static int
zlibcmp(const unsigned char *buf)
{
unsigned short x = 1;
unsigned char *s = CAST(unsigned char *, CAST(void *, &x));
if ((buf[0] & 0xf) != 8 || (buf[0] & 0x80) != 0)
return 0;
if (s[0] != 1) /* endianness test */
x = buf[0] | (buf[1] << 8);
else
x = buf[1] | (buf[0] << 8);
if (x % 31)
return 0;
return 1;
}
#endif
#define gzip_flags "-cd"
#define lrzip_flags "-do"
#define lzip_flags gzip_flags
static const char *gzip_args[] = {
"gzip", gzip_flags, NULL
};
static const char *uncompress_args[] = {
"uncompress", "-c", NULL
};
static const char *bzip2_args[] = {
"bzip2", "-cd", NULL
};
static const char *lzip_args[] = {
"lzip", lzip_flags, NULL
};
static const char *xz_args[] = {
"xz", "-cd", NULL
};
static const char *lrzip_args[] = {
"lrzip", lrzip_flags, NULL
};
static const char *lz4_args[] = {
"lz4", "-cd", NULL
};
static const char *zstd_args[] = {
"zstd", "-cd", NULL
};
#define do_zlib NULL
#define do_bzlib NULL
private const struct {
const void *magic;
size_t maglen;
const char **argv;
void *unused;
} compr[] = {
{ "\037\235", 2, gzip_args, NULL }, /* compressed */
/* Uncompress can get stuck; so use gzip first if we have it
* Idea from Damien Clark, thanks! */
{ "\037\235", 2, uncompress_args, NULL }, /* compressed */
{ "\037\213", 2, gzip_args, do_zlib }, /* gzipped */
{ "\037\236", 2, gzip_args, NULL }, /* frozen */
{ "\037\240", 2, gzip_args, NULL }, /* SCO LZH */
/* the standard pack utilities do not accept standard input */
{ "\037\036", 2, gzip_args, NULL }, /* packed */
{ "PK\3\4", 4, gzip_args, NULL }, /* pkzipped, */
/* ...only first file examined */
{ "BZh", 3, bzip2_args, do_bzlib }, /* bzip2-ed */
{ "LZIP", 4, lzip_args, NULL }, /* lzip-ed */
{ "\3757zXZ\0", 6, xz_args, NULL }, /* XZ Utils */
{ "LRZI", 4, lrzip_args, NULL }, /* LRZIP */
{ "\004\"M\030",4, lz4_args, NULL }, /* LZ4 */
{ "\x28\xB5\x2F\xFD", 4, zstd_args, NULL }, /* zstd */
#ifdef ZLIBSUPPORT
{ RCAST(const void *, zlibcmp), 0, zlib_args, NULL }, /* zlib */
#endif
};
#define OKDATA 0
#define NODATA 1
#define ERRDATA 2
private ssize_t swrite(int, const void *, size_t);
#if HAVE_FORK
private size_t ncompr = sizeof(compr) / sizeof(compr[0]);
private int uncompressbuf(int, size_t, size_t, const unsigned char *,
unsigned char **, size_t *);
#ifdef BUILTIN_DECOMPRESS
private int uncompresszlib(const unsigned char *, unsigned char **, size_t,
size_t *, int);
private int uncompressgzipped(const unsigned char *, unsigned char **, size_t,
size_t *);
#endif
#ifdef BUILTIN_BZLIB
private int uncompressbzlib(const unsigned char *, unsigned char **, size_t,
size_t *, int);
#endif
static int makeerror(unsigned char **, size_t *, const char *, ...)
__attribute__((__format__(__printf__, 3, 4)));
private const char *methodname(size_t);
private int
format_decompression_error(struct magic_set *ms, size_t i, unsigned char *buf)
{
unsigned char *p;
int mime = ms->flags & MAGIC_MIME;
if (!mime)
return file_printf(ms, "ERROR:[%s: %s]", methodname(i), buf);
for (p = buf; *p; p++)
if (!isalnum(*p))
*p = '-';
return file_printf(ms, "application/x-decompression-error-%s-%s",
methodname(i), buf);
}
protected int
file_zmagic(struct magic_set *ms, const struct buffer *b, const char *name)
{
unsigned char *newbuf = NULL;
size_t i, nsz;
char *rbuf;
file_pushbuf_t *pb;
int urv, prv, rv = 0;
int mime = ms->flags & MAGIC_MIME;
int fd = b->fd;
const unsigned char *buf = CAST(const unsigned char *, b->fbuf);
size_t nbytes = b->flen;
sig_t osigpipe;
if ((ms->flags & MAGIC_COMPRESS) == 0)
return 0;
osigpipe = signal(SIGPIPE, SIG_IGN);
for (i = 0; i < ncompr; i++) {
int zm;
if (nbytes < compr[i].maglen)
continue;
#ifdef ZLIBSUPPORT
if (compr[i].maglen == 0)
zm = (RCAST(int (*)(const unsigned char *),
CCAST(void *, compr[i].magic)))(buf);
else
#endif
zm = memcmp(buf, compr[i].magic, compr[i].maglen) == 0;
if (!zm)
continue;
nsz = nbytes;
urv = uncompressbuf(fd, ms->bytes_max, i, buf, &newbuf, &nsz);
DPRINTF("uncompressbuf = %d, %s, %" SIZE_T_FORMAT "u\n", urv,
(char *)newbuf, nsz);
switch (urv) {
case OKDATA:
case ERRDATA:
ms->flags &= ~MAGIC_COMPRESS;
if (urv == ERRDATA)
prv = format_decompression_error(ms, i, newbuf);
else
prv = file_buffer(ms, -1, name, newbuf, nsz);
if (prv == -1)
goto error;
rv = 1;
if ((ms->flags & MAGIC_COMPRESS_TRANSP) != 0)
goto out;
if (mime != MAGIC_MIME && mime != 0)
goto out;
if ((file_printf(ms,
mime ? " compressed-encoding=" : " (")) == -1)
goto error;
if ((pb = file_push_buffer(ms)) == NULL)
goto error;
/*
* XXX: If file_buffer fails here, we overwrite
* the compressed text. FIXME.
*/
if (file_buffer(ms, -1, NULL, buf, nbytes) == -1) {
if (file_pop_buffer(ms, pb) != NULL)
abort();
goto error;
}
if ((rbuf = file_pop_buffer(ms, pb)) != NULL) {
if (file_printf(ms, "%s", rbuf) == -1) {
free(rbuf);
goto error;
}
free(rbuf);
}
if (!mime && file_printf(ms, ")") == -1)
goto error;
/*FALLTHROUGH*/
case NODATA:
break;
default:
abort();
/*NOTREACHED*/
error:
rv = -1;
break;
}
}
out:
DPRINTF("rv = %d\n", rv);
(void)signal(SIGPIPE, osigpipe);
free(newbuf);
ms->flags |= MAGIC_COMPRESS;
DPRINTF("Zmagic returns %d\n", rv);
return rv;
}
#endif
/*
* `safe' write for sockets and pipes.
*/
private ssize_t
swrite(int fd, const void *buf, size_t n)
{
ssize_t rv;
size_t rn = n;
do
switch (rv = write(fd, buf, n)) {
case -1:
if (errno == EINTR)
continue;
return -1;
default:
n -= rv;
buf = CAST(const char *, buf) + rv;
break;
}
while (n > 0);
return rn;
}
/*
* `safe' read for sockets and pipes.
*/
protected ssize_t
sread(int fd, void *buf, size_t n, int canbepipe __attribute__((__unused__)))
{
ssize_t rv;
#ifdef FIONREAD
int t = 0;
#endif
size_t rn = n;
if (fd == STDIN_FILENO)
goto nocheck;
#ifdef FIONREAD
if (canbepipe && (ioctl(fd, FIONREAD, &t) == -1 || t == 0)) {
#ifdef FD_ZERO
ssize_t cnt;
for (cnt = 0;; cnt++) {
fd_set check;
struct timeval tout = {0, 100 * 1000};
int selrv;
FD_ZERO(&check);
FD_SET(fd, &check);
/*
* Avoid soft deadlock: do not read if there
* is nothing to read from sockets and pipes.
*/
selrv = select(fd + 1, &check, NULL, NULL, &tout);
if (selrv == -1) {
if (errno == EINTR || errno == EAGAIN)
continue;
} else if (selrv == 0 && cnt >= 5) {
return 0;
} else
break;
}
#endif
(void)ioctl(fd, FIONREAD, &t);
}
if (t > 0 && CAST(size_t, t) < n) {
n = t;
rn = n;
}
#endif
nocheck:
do
switch ((rv = read(fd, buf, n))) {
case -1:
if (errno == EINTR)
continue;
return -1;
case 0:
return rn - n;
default:
n -= rv;
buf = CAST(char *, CCAST(void *, buf)) + rv;
break;
}
while (n > 0);
return rn;
}
protected int
file_pipe2file(struct magic_set *ms, int fd, const void *startbuf,
size_t nbytes)
{
char buf[4096];
ssize_t r;
int tfd;
(void)strlcpy(buf, "/tmp/file.XXXXXX", sizeof buf);
#ifndef HAVE_MKSTEMP
{
char *ptr = mktemp(buf);
tfd = open(ptr, O_RDWR|O_TRUNC|O_EXCL|O_CREAT, 0600);
r = errno;
(void)unlink(ptr);
errno = r;
}
#else
{
int te;
mode_t ou = umask(0);
tfd = mkstemp(buf);
(void)umask(ou);
te = errno;
(void)unlink(buf);
errno = te;
}
#endif
if (tfd == -1) {
file_error(ms, errno,
"cannot create temporary file for pipe copy");
return -1;
}
if (swrite(tfd, startbuf, nbytes) != CAST(ssize_t, nbytes))
r = 1;
else {
while ((r = sread(fd, buf, sizeof(buf), 1)) > 0)
if (swrite(tfd, buf, CAST(size_t, r)) != r)
break;
}
switch (r) {
case -1:
file_error(ms, errno, "error copying from pipe to temp file");
return -1;
case 0:
break;
default:
file_error(ms, errno, "error while writing to temp file");
return -1;
}
/*
* We duplicate the file descriptor, because fclose on a
* tmpfile will delete the file, but any open descriptors
* can still access the phantom inode.
*/
if ((fd = dup2(tfd, fd)) == -1) {
file_error(ms, errno, "could not dup descriptor for temp file");
return -1;
}
(void)close(tfd);
if (lseek(fd, CAST(off_t, 0), SEEK_SET) == CAST(off_t, -1)) {
file_badseek(ms);
return -1;
}
return fd;
}
#if HAVE_FORK
#ifdef BUILTIN_DECOMPRESS
#define FHCRC (1 << 1)
#define FEXTRA (1 << 2)
#define FNAME (1 << 3)
#define FCOMMENT (1 << 4)
private int
uncompressgzipped(const unsigned char *old, unsigned char **newch,
size_t bytes_max, size_t *n)
{
unsigned char flg = old[3];
size_t data_start = 10;
if (flg & FEXTRA) {
if (data_start + 1 >= *n)
goto err;
data_start += 2 + old[data_start] + old[data_start + 1] * 256;
}
if (flg & FNAME) {
while(data_start < *n && old[data_start])
data_start++;
data_start++;
}
if (flg & FCOMMENT) {
while(data_start < *n && old[data_start])
data_start++;
data_start++;
}
if (flg & FHCRC)
data_start += 2;
if (data_start >= *n)
goto err;
*n -= data_start;
old += data_start;
return uncompresszlib(old, newch, bytes_max, n, 0);
err:
return makeerror(newch, n, "File too short");
}
private int
uncompresszlib(const unsigned char *old, unsigned char **newch,
size_t bytes_max, size_t *n, int zlib)
{
int rc;
z_stream z;
if ((*newch = CAST(unsigned char *, malloc(bytes_max + 1))) == NULL)
return makeerror(newch, n, "No buffer, %s", strerror(errno));
z.next_in = CCAST(Bytef *, old);
z.avail_in = CAST(uint32_t, *n);
z.next_out = *newch;
z.avail_out = CAST(unsigned int, bytes_max);
z.zalloc = Z_NULL;
z.zfree = Z_NULL;
z.opaque = Z_NULL;
/* LINTED bug in header macro */
rc = zlib ? inflateInit(&z) : inflateInit2(&z, -15);
if (rc != Z_OK)
goto err;
rc = inflate(&z, Z_SYNC_FLUSH);
if (rc != Z_OK && rc != Z_STREAM_END)
goto err;
*n = CAST(size_t, z.total_out);
rc = inflateEnd(&z);
if (rc != Z_OK)
goto err;
/* let's keep the nul-terminate tradition */
(*newch)[*n] = '\0';
return OKDATA;
err:
strlcpy(RCAST(char *, *newch), z.msg ? z.msg : zError(rc), bytes_max);
*n = strlen(RCAST(char *, *newch));
return ERRDATA;
}
#endif
static int
makeerror(unsigned char **buf, size_t *len, const char *fmt, ...)
{
char *msg;
va_list ap;
int rv;
va_start(ap, fmt);
rv = vasprintf(&msg, fmt, ap);
va_end(ap);
if (rv < 0) {
*buf = NULL;
*len = 0;
return NODATA;
}
*buf = RCAST(unsigned char *, msg);
*len = strlen(msg);
return ERRDATA;
}
static void
closefd(int *fd, size_t i)
{
if (fd[i] == -1)
return;
(void) close(fd[i]);
fd[i] = -1;
}
static void
closep(int *fd)
{
size_t i;
for (i = 0; i < 2; i++)
closefd(fd, i);
}
static void
copydesc(int i, int *fd)
{
int j = fd[i == STDIN_FILENO ? 0 : 1];
if (j == i)
return;
if (dup2(j, i) == -1) {
DPRINTF("dup(%d, %d) failed (%s)\n", j, i, strerror(errno));
exit(1);
}
closep(fd);
}
static void
writechild(int fdp[3][2], const void *old, size_t n)
{
int status;
closefd(fdp[STDIN_FILENO], 0);
/*
* fork again, to avoid blocking because both
* pipes filled
*/
switch (fork()) {
case 0: /* child */
closefd(fdp[STDOUT_FILENO], 0);
if (swrite(fdp[STDIN_FILENO][1], old, n) != CAST(ssize_t, n)) {
DPRINTF("Write failed (%s)\n", strerror(errno));
exit(1);
}
exit(0);
/*NOTREACHED*/
case -1:
DPRINTF("Fork failed (%s)\n", strerror(errno));
exit(1);
/*NOTREACHED*/
default: /* parent */
if (wait(&status) == -1) {
DPRINTF("Wait failed (%s)\n", strerror(errno));
exit(1);
}
DPRINTF("Grandchild wait return %#x\n", status);
}
closefd(fdp[STDIN_FILENO], 1);
}
static ssize_t
filter_error(unsigned char *ubuf, ssize_t n)
{
char *p;
char *buf;
ubuf[n] = '\0';
buf = RCAST(char *, ubuf);
while (isspace(CAST(unsigned char, *buf)))
buf++;
DPRINTF("Filter error[[[%s]]]\n", buf);
if ((p = strchr(CAST(char *, buf), '\n')) != NULL)
*p = '\0';
if ((p = strchr(CAST(char *, buf), ';')) != NULL)
*p = '\0';
if ((p = strrchr(CAST(char *, buf), ':')) != NULL) {
++p;
while (isspace(CAST(unsigned char, *p)))
p++;
n = strlen(p);
memmove(ubuf, p, CAST(size_t, n + 1));
}
DPRINTF("Filter error after[[[%s]]]\n", (char *)ubuf);
if (islower(*ubuf))
*ubuf = toupper(*ubuf);
return n;
}
private const char *
methodname(size_t method)
{
#ifdef BUILTIN_DECOMPRESS
/* FIXME: This doesn't cope with bzip2 */
if (method == 2 || compr[method].maglen == 0)
return "zlib";
#endif
return compr[method].argv[0];
}
private int
uncompressbuf(int fd, size_t bytes_max, size_t method, const unsigned char *old,
unsigned char **newch, size_t* n)
{
int fdp[3][2];
int status, rv;
size_t i;
ssize_t r;
#ifdef BUILTIN_DECOMPRESS
/* FIXME: This doesn't cope with bzip2 */
if (method == 2)
return uncompressgzipped(old, newch, bytes_max, n);
if (compr[method].maglen == 0)
return uncompresszlib(old, newch, bytes_max, n, 1);
#endif
(void)fflush(stdout);
(void)fflush(stderr);
for (i = 0; i < __arraycount(fdp); i++)
fdp[i][0] = fdp[i][1] = -1;
if ((fd == -1 && pipe(fdp[STDIN_FILENO]) == -1) ||
pipe(fdp[STDOUT_FILENO]) == -1 || pipe(fdp[STDERR_FILENO]) == -1) {
closep(fdp[STDIN_FILENO]);
closep(fdp[STDOUT_FILENO]);
return makeerror(newch, n, "Cannot create pipe, %s",
strerror(errno));
}
switch (fork()) {
case 0: /* child */
if (fd != -1) {
fdp[STDIN_FILENO][0] = fd;
(void) lseek(fd, CAST(off_t, 0), SEEK_SET);
}
for (i = 0; i < __arraycount(fdp); i++)
copydesc(CAST(int, i), fdp[i]);
(void)execvp(compr[method].argv[0],
RCAST(char *const *, RCAST(intptr_t, compr[method].argv)));
dprintf(STDERR_FILENO, "exec `%s' failed, %s",
compr[method].argv[0], strerror(errno));
exit(1);
/*NOTREACHED*/
case -1:
return makeerror(newch, n, "Cannot fork, %s",
strerror(errno));
default: /* parent */
for (i = 1; i < __arraycount(fdp); i++)
closefd(fdp[i], 1);
/* Write the buffer data to the child, if we don't have fd */
if (fd == -1)
writechild(fdp, old, *n);
*newch = CAST(unsigned char *, malloc(bytes_max + 1));
if (*newch == NULL) {
rv = makeerror(newch, n, "No buffer, %s",
strerror(errno));
goto err;
}
rv = OKDATA;
if ((r = sread(fdp[STDOUT_FILENO][0], *newch, bytes_max, 0)) > 0)
break;
DPRINTF("Read stdout failed %d (%s)\n", fdp[STDOUT_FILENO][0],
r != -1 ? strerror(errno) : "no data");
rv = ERRDATA;
if (r == 0 &&
(r = sread(fdp[STDERR_FILENO][0], *newch, bytes_max, 0)) > 0)
{
r = filter_error(*newch, r);
break;
}
free(*newch);
if (r == 0)
rv = makeerror(newch, n, "Read failed, %s",
strerror(errno));
else
rv = makeerror(newch, n, "No data");
goto err;
}
*n = r;
/* NUL terminate, as every buffer is handled here. */
(*newch)[*n] = '\0';
err:
closefd(fdp[STDIN_FILENO], 1);
closefd(fdp[STDOUT_FILENO], 0);
closefd(fdp[STDERR_FILENO], 0);
if (wait(&status) == -1) {
free(*newch);
rv = makeerror(newch, n, "Wait failed, %s", strerror(errno));
DPRINTF("Child wait return %#x\n", status);
} else if (!WIFEXITED(status)) {
DPRINTF("Child not exited (%#x)\n", status);
} else if (WEXITSTATUS(status) != 0) {
DPRINTF("Child exited (%#x)\n", WEXITSTATUS(status));
}
closefd(fdp[STDIN_FILENO], 0);
DPRINTF("Returning %p n=%" SIZE_T_FORMAT "u rv=%d\n", *newch, *n, rv);
return rv;
}
#endif
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