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b7c5813c98
* Update libmagic to 5.45
This also cleans up magicdata.patch: changes that are already in upstream file
were removed from that patch file.
There are five (expected) test output changes.
All these were also checked with the file command.
- bug77961.phpt changes because there's now an early error-return in the
`if (ts == FILE_BADSIZE) {` branch.
- cve-2014-1943.phpt and cve-2014-1943-mb.phpt change because now the crafted
data is recognised as a simh file.
- bug71434.phpt now properly recognises it as a Python file.
- ext/fileinfo/tests/finfo_file_basic.phpt more specific mime type.
* Adjust memory requirement for s390x fileinfo run
The larger database causes a higher memory usage.
Similar to 962c082a5b
.
* [ci skip] NEWS
180 lines
5.2 KiB
C
180 lines
5.2 KiB
C
/*
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* Copyright (c) Ian F. Darwin 1986-1995.
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* Software written by Ian F. Darwin and others;
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* maintained 1995-present by Christos Zoulas and others.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice immediately at the beginning of the file, without modification,
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* this list of conditions, and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* is_tar() -- figure out whether file is a tar archive.
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*
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* Stolen (by the author!) from the file_public domain tar program:
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* Public Domain version written 26 Aug 1985 John Gilmore (ihnp4!hoptoad!gnu).
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*
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* @(#)list.c 1.18 9/23/86 Public Domain - gnu
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*
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* Comments changed and some code/comments reformatted
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* for file command by Ian Darwin.
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*/
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#include "file.h"
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#ifndef lint
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FILE_RCSID("@(#)$File: is_tar.c,v 1.50 2022/12/26 17:31:14 christos Exp $")
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#endif
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#include "magic.h"
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#include <string.h>
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#include <ctype.h>
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#include "tar.h"
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#define isodigit(c) ( ((c) >= '0') && ((c) <= '7') )
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file_private int is_tar(const unsigned char *, size_t);
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file_private int from_oct(const char *, size_t); /* Decode octal number */
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static const char tartype[][32] = { /* should be equal to messages */
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"tar archive", /* found in ../magic/Magdir/archive */
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"POSIX tar archive",
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"POSIX tar archive (GNU)", /* */
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};
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file_protected int
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file_is_tar(struct magic_set *ms, const struct buffer *b)
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{
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const unsigned char *buf = CAST(const unsigned char *, b->fbuf);
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size_t nbytes = b->flen;
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/*
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* Do the tar test first, because if the first file in the tar
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* archive starts with a dot, we can confuse it with an nroff file.
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*/
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int tar;
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int mime = ms->flags & MAGIC_MIME;
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if ((ms->flags & (MAGIC_APPLE|MAGIC_EXTENSION)) != 0)
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return 0;
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tar = is_tar(buf, nbytes);
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if (tar < 1 || tar > 3)
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return 0;
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if (mime == MAGIC_MIME_ENCODING)
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return 1;
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if (file_printf(ms, "%s", mime ? "application/x-tar" :
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tartype[tar - 1]) == -1)
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return -1;
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return 1;
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}
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/*
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* Return
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* 0 if the checksum is bad (i.e., probably not a tar archive),
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* 1 for old UNIX tar file,
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* 2 for Unix Std (POSIX) tar file,
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* 3 for GNU tar file.
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*/
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file_private int
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is_tar(const unsigned char *buf, size_t nbytes)
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{
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static const char gpkg_match[] = "/gpkg-1";
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const union record *header = RCAST(const union record *,
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RCAST(const void *, buf));
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size_t i;
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int sum, recsum;
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const unsigned char *p, *ep;
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const char *nulp;
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if (nbytes < sizeof(*header))
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return 0;
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/* If the file looks like Gentoo GLEP 78 binary package (GPKG),
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* don't waste time on further checks and fall back to magic rules.
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*/
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nulp = CAST(const char *,
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memchr(header->header.name, 0, sizeof(header->header.name)));
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if (nulp != NULL && nulp >= header->header.name + sizeof(gpkg_match) &&
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memcmp(nulp - sizeof(gpkg_match) + 1, gpkg_match,
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sizeof(gpkg_match)) == 0)
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return 0;
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recsum = from_oct(header->header.chksum, sizeof(header->header.chksum));
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sum = 0;
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p = header->charptr;
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ep = header->charptr + sizeof(*header);
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while (p < ep)
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sum += *p++;
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/* Adjust checksum to count the "chksum" field as blanks. */
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for (i = 0; i < sizeof(header->header.chksum); i++)
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sum -= header->header.chksum[i];
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sum += ' ' * sizeof(header->header.chksum);
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if (sum != recsum)
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return 0; /* Not a tar archive */
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if (strncmp(header->header.magic, GNUTMAGIC,
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sizeof(header->header.magic)) == 0)
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return 3; /* GNU Unix Standard tar archive */
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if (strncmp(header->header.magic, TMAGIC,
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sizeof(header->header.magic)) == 0)
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return 2; /* Unix Standard tar archive */
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return 1; /* Old fashioned tar archive */
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}
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/*
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* Quick and dirty octal conversion.
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*
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* Result is -1 if the field is invalid (all blank, or non-octal).
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*/
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file_private int
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from_oct(const char *where, size_t digs)
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{
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int value;
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if (digs == 0)
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return -1;
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while (isspace(CAST(unsigned char, *where))) { /* Skip spaces */
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where++;
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if (digs-- == 0)
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return -1; /* All blank field */
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}
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value = 0;
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while (digs > 0 && isodigit(*where)) { /* Scan til non-octal */
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value = (value << 3) | (*where++ - '0');
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digs--;
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}
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if (digs > 0 && *where && !isspace(CAST(unsigned char, *where)))
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return -1; /* Ended on non-(space/NUL) */
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return value;
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}
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