version 1.18, 2003/06/13 18:31:14 |
version 1.19, 2004/05/19 02:32:35 |
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/* $OpenBSD$ */ |
/* $OpenBSD$ */ |
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/* |
/* |
* apprentice - make one pass through /etc/magic, learning its secrets. |
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* |
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* Copyright (c) Ian F. Darwin 1986-1995. |
* Copyright (c) Ian F. Darwin 1986-1995. |
* Software written by Ian F. Darwin and others; |
* Software written by Ian F. Darwin and others; |
* maintained 1995-present by Christos Zoulas and others. |
* maintained 1995-present by Christos Zoulas and others. |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
* SUCH DAMAGE. |
* SUCH DAMAGE. |
*/ |
*/ |
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/* |
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* apprentice - make one pass through /etc/magic, learning its secrets. |
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*/ |
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#include <stdio.h> |
#include "file.h" |
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#include "magic.h" |
#include <stdlib.h> |
#include <stdlib.h> |
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#ifdef HAVE_UNISTD_H |
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#include <unistd.h> |
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#endif |
#include <string.h> |
#include <string.h> |
#include <ctype.h> |
#include <ctype.h> |
#include <errno.h> |
#include <fcntl.h> |
#include <err.h> |
#include <sys/stat.h> |
#include "file.h" |
#include <sys/param.h> |
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#ifdef QUICK |
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#include <sys/mman.h> |
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#endif |
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#ifndef lint |
#ifndef lint |
static char *moduleid = "$OpenBSD$"; |
FILE_RCSID("@(#)$Id$") |
#endif /* lint */ |
#endif /* lint */ |
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#define EATAB {while (isascii((unsigned char) *l) && \ |
#define EATAB {while (isascii((unsigned char) *l) && \ |
isspace((unsigned char) *l)) ++l;} |
isspace((unsigned char) *l)) ++l;} |
#define LOWCASE(l) (isupper((unsigned char) (l)) ? \ |
#define LOWCASE(l) (isupper((unsigned char) (l)) ? \ |
tolower((unsigned char) (l)) : (l)) |
tolower((unsigned char) (l)) : (l)) |
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/* |
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* Work around a bug in headers on Digital Unix. |
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* At least confirmed for: OSF1 V4.0 878 |
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*/ |
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#if defined(__osf__) && defined(__DECC) |
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#ifdef MAP_FAILED |
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#undef MAP_FAILED |
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#endif |
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#endif |
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#ifndef MAP_FAILED |
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#define MAP_FAILED (void *) -1 |
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#endif |
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static int getvalue(struct magic *, char **); |
#ifndef MAP_FILE |
static int hextoint(int); |
#define MAP_FILE 0 |
static char *getstr(char *, char *, int, int *); |
#endif |
static int parse(char *, int *, int); |
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static void eatsize(char **); |
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static int maxmagic = 0; |
#ifndef MAXPATHLEN |
static int alloc_incr = 256; |
#define MAXPATHLEN 1024 |
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#endif |
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static int apprentice_1(char *, int); |
private int getvalue(struct magic_set *ms, struct magic *, char **); |
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private int hextoint(int); |
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private char *getstr(struct magic_set *, char *, char *, int, int *); |
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private int parse(struct magic_set *, struct magic **, uint32_t *, char *, int); |
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private void eatsize(char **); |
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private int apprentice_1(struct magic_set *, const char *, int, struct mlist *); |
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private int apprentice_file(struct magic_set *, struct magic **, uint32_t *, |
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const char *, int); |
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private void byteswap(struct magic *, uint32_t); |
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private void bs1(struct magic *); |
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private uint16_t swap2(uint16_t); |
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private uint32_t swap4(uint32_t); |
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private char *mkdbname(const char *, char *, size_t); |
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private int apprentice_map(struct magic_set *, struct magic **, uint32_t *, |
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const char *); |
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private int apprentice_compile(struct magic_set *, struct magic **, uint32_t *, |
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const char *); |
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private size_t maxmagic = 0; |
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private size_t magicsize = sizeof(struct magic); |
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#ifdef COMPILE_ONLY |
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const char *magicfile; |
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char *progname; |
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int lineno; |
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int main(int, char *[]); |
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int |
int |
apprentice(fn, check) |
main(int argc, char *argv[]) |
char *fn; /* list of magic files */ |
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int check; /* non-zero? checking-only run. */ |
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{ |
{ |
char *p, *mfn; |
int ret; |
int file_err, errs = -1; |
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size_t len; |
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maxmagic = MAXMAGIS; |
if ((progname = strrchr(argv[0], '/')) != NULL) |
magic = (struct magic *) calloc(maxmagic, sizeof(struct magic)); |
progname++; |
len = strlen(fn)+1; |
else |
mfn = malloc(len); |
progname = argv[0]; |
if (magic == NULL || mfn == NULL) { |
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warn("malloc"); |
if (argc != 2) { |
if (check) |
(void)fprintf(stderr, "usage: %s file\n", progname); |
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exit(1); |
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} |
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magicfile = argv[1]; |
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exit(file_apprentice(magicfile, COMPILE, MAGIC_CHECK) == -1 ? 1 : 0); |
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} |
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#endif /* COMPILE_ONLY */ |
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/* |
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* Handle one file. |
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*/ |
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private int |
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apprentice_1(struct magic_set *ms, const char *fn, int action, |
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struct mlist *mlist) |
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{ |
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struct magic *magic = NULL; |
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uint32_t nmagic = 0; |
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struct mlist *ml; |
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int rv = -1; |
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int mapped; |
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if (magicsize != FILE_MAGICSIZE) { |
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file_error(ms, 0, "magic element size %lu != %lu", |
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(unsigned long)sizeof(*magic), |
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(unsigned long)FILE_MAGICSIZE); |
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return -1; |
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} |
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if (action == FILE_COMPILE) { |
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rv = apprentice_file(ms, &magic, &nmagic, fn, action); |
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if (rv != 0) |
return -1; |
return -1; |
else |
rv = apprentice_compile(ms, &magic, &nmagic, fn); |
exit(1); |
free(magic); |
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return rv; |
} |
} |
strlcpy(mfn, fn, len); |
#ifndef COMPILE_ONLY |
fn = mfn; |
if ((rv = apprentice_map(ms, &magic, &nmagic, fn)) == -1) { |
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if (ms->flags & MAGIC_CHECK) |
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file_magwarn("using regular magic file `%s'", fn); |
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rv = apprentice_file(ms, &magic, &nmagic, fn, action); |
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if (rv != 0) |
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return -1; |
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mapped = 0; |
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} |
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if (rv == -1) |
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return rv; |
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mapped = rv; |
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if (magic == NULL || nmagic == 0) { |
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file_delmagic(magic, mapped, nmagic); |
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return -1; |
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} |
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if ((ml = malloc(sizeof(*ml))) == NULL) { |
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file_delmagic(magic, mapped, nmagic); |
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file_oomem(ms); |
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return -1; |
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} |
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ml->magic = magic; |
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ml->nmagic = nmagic; |
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ml->mapped = mapped; |
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mlist->prev->next = ml; |
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ml->prev = mlist->prev; |
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ml->next = mlist; |
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mlist->prev = ml; |
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return 0; |
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#endif /* COMPILE_ONLY */ |
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} |
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protected void |
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file_delmagic(struct magic *p, int type, size_t entries) |
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{ |
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if (p == NULL) |
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return; |
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switch (type) { |
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case 2: |
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p--; |
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(void)munmap((void *)p, sizeof(*p) * (entries + 1)); |
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break; |
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case 1: |
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p--; |
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case 0: |
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free(p); |
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break; |
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default: |
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abort(); |
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} |
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} |
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/* const char *fn: list of magic files */ |
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protected struct mlist * |
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file_apprentice(struct magic_set *ms, const char *fn, int action) |
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{ |
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char *p, *mfn, *afn = NULL; |
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int file_err, errs = -1; |
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struct mlist *mlist; |
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if (fn == NULL) |
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fn = getenv("MAGIC"); |
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if (fn == NULL) |
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fn = MAGIC; |
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if ((fn = mfn = strdup(fn)) == NULL) { |
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file_oomem(ms); |
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return NULL; |
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} |
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if ((mlist = malloc(sizeof(*mlist))) == NULL) { |
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free(mfn); |
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file_oomem(ms); |
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return NULL; |
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} |
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mlist->next = mlist->prev = mlist; |
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while (fn) { |
while (fn) { |
p = strchr(fn, ':'); |
p = strchr(fn, PATHSEP); |
if (p) |
if (p) |
*p++ = '\0'; |
*p++ = '\0'; |
file_err = apprentice_1(fn, check); |
if (*fn == '\0') |
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break; |
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if (ms->flags & MAGIC_MIME) { |
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size_t len = strlen(fn) + 5 + 1; |
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if ((afn = malloc(len)) == NULL) { |
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free(mfn); |
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free(mlist); |
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file_oomem(ms); |
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return NULL; |
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} |
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(void)strlcpy(afn, fn, len); |
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(void)strlcat(afn, ".mime", len); |
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fn = afn; |
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} |
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file_err = apprentice_1(ms, fn, action, mlist); |
if (file_err > errs) |
if (file_err > errs) |
errs = file_err; |
errs = file_err; |
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if (afn) { |
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free(afn); |
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afn = NULL; |
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} |
fn = p; |
fn = p; |
} |
} |
if (errs == -1) |
if (errs == -1) { |
warnx("couldn't find any magic files!"); |
free(mfn); |
if (!check && errs) |
free(mlist); |
exit(1); |
mlist = NULL; |
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file_error(ms, 0, "could not find any magic files!"); |
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return NULL; |
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} |
free(mfn); |
free(mfn); |
return errs; |
return mlist; |
} |
} |
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static int |
/* |
apprentice_1(fn, check) |
* parse from a file |
char *fn; /* name of magic file */ |
* const char *fn: name of magic file |
int check; /* non-zero? checking-only run. */ |
*/ |
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private int |
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apprentice_file(struct magic_set *ms, struct magic **magicp, uint32_t *nmagicp, |
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const char *fn, int action) |
{ |
{ |
static const char hdr[] = |
private const char hdr[] = |
"cont\toffset\ttype\topcode\tmask\tvalue\tdesc"; |
"cont\toffset\ttype\topcode\tmask\tvalue\tdesc"; |
FILE *f; |
FILE *f; |
char line[BUFSIZ+1]; |
char line[BUFSIZ+1]; |
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int lineno; |
int errs = 0; |
int errs = 0; |
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f = fopen(fn, "r"); |
f = fopen(fn, "r"); |
if (f==NULL) { |
if (f == NULL) { |
if (errno != ENOENT) |
if (errno != ENOENT) |
warn("%s", fn); |
file_error(ms, errno, "cannot read magic file `%s'", |
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fn); |
return -1; |
return -1; |
} |
} |
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/* parse it */ |
maxmagic = MAXMAGIS; |
if (check) /* print silly verbose header for USG compat. */ |
*magicp = (struct magic *) calloc(maxmagic, sizeof(struct magic)); |
(void) printf("%s\n", hdr); |
if (*magicp == NULL) { |
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(void)fclose(f); |
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file_oomem(ms); |
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return -1; |
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} |
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for (lineno = 1;fgets(line, BUFSIZ, f) != NULL; lineno++) { |
/* print silly verbose header for USG compat. */ |
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if (action == FILE_CHECK) |
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(void)fprintf(stderr, "%s\n", hdr); |
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/* parse it */ |
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for (lineno = 1; fgets(line, BUFSIZ, f) != NULL; lineno++) { |
if (line[0]=='#') /* comment, do not parse */ |
if (line[0]=='#') /* comment, do not parse */ |
continue; |
continue; |
if (strlen(line) <= (unsigned)1) /* null line, garbage, etc */ |
if (strlen(line) <= (unsigned)1) /* null line, garbage, etc */ |
continue; |
continue; |
line[strlen(line)-1] = '\0'; /* delete newline */ |
line[strlen(line)-1] = '\0'; /* delete newline */ |
if (parse(line, &nmagic, check) != 0) |
if (parse(ms, magicp, nmagicp, line, action) != 0) |
errs = 1; |
errs = 1; |
} |
} |
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(void) fclose(f); |
(void)fclose(f); |
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if (errs) { |
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free(*magicp); |
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*magicp = NULL; |
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*nmagicp = 0; |
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} |
return errs; |
return errs; |
} |
} |
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/* |
/* |
* extend the sign bit if the comparison is to be signed |
* extend the sign bit if the comparison is to be signed |
*/ |
*/ |
uint32_t |
protected uint32_t |
signextend(m, v) |
file_signextend(struct magic_set *ms, struct magic *m, uint32_t v) |
struct magic *m; |
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uint32_t v; |
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{ |
{ |
if (!(m->flag & UNSIGNED)) |
if (!(m->flag & UNSIGNED)) |
switch(m->type) { |
switch(m->type) { |
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* vital. When later compared with the data, |
* vital. When later compared with the data, |
* the sign extension must have happened. |
* the sign extension must have happened. |
*/ |
*/ |
case BYTE: |
case FILE_BYTE: |
v = (char) v; |
v = (char) v; |
break; |
break; |
case SHORT: |
case FILE_SHORT: |
case BESHORT: |
case FILE_BESHORT: |
case LESHORT: |
case FILE_LESHORT: |
v = (short) v; |
v = (short) v; |
break; |
break; |
case DATE: |
case FILE_DATE: |
case BEDATE: |
case FILE_BEDATE: |
case LEDATE: |
case FILE_LEDATE: |
case LONG: |
case FILE_LDATE: |
case BELONG: |
case FILE_BELDATE: |
case LELONG: |
case FILE_LELDATE: |
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case FILE_LONG: |
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case FILE_BELONG: |
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case FILE_LELONG: |
v = (int32_t) v; |
v = (int32_t) v; |
break; |
break; |
case STRING: |
case FILE_STRING: |
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case FILE_PSTRING: |
break; |
break; |
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case FILE_REGEX: |
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break; |
default: |
default: |
warnx("can't happen: m->type=%d", m->type); |
if (ms->flags & MAGIC_CHECK) |
return -1; |
file_magwarn("cannot happen: m->type=%d\n", |
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m->type); |
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return ~0U; |
} |
} |
return v; |
return v; |
} |
} |
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/* |
/* |
* parse one line from magic file, put into magic[index++] if valid |
* parse one line from magic file, put into magic[index++] if valid |
*/ |
*/ |
static int |
private int |
parse(l, ndx, check) |
parse(struct magic_set *ms, struct magic **magicp, uint32_t *nmagicp, char *l, |
char *l; |
int action) |
int *ndx, check; |
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{ |
{ |
int i = 0, nd = *ndx; |
int i = 0; |
struct magic *m; |
struct magic *m; |
char *t, *s; |
char *t; |
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private const char *fops = FILE_OPS; |
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uint32_t val; |
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if (nd+1 >= maxmagic){ |
#define ALLOC_INCR 200 |
struct magic *mtmp; |
if (*nmagicp + 1 >= maxmagic){ |
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maxmagic += ALLOC_INCR; |
maxmagic += alloc_incr; |
if ((m = (struct magic *) realloc(*magicp, |
if ((mtmp = (struct magic *) realloc(magic, |
sizeof(struct magic) * maxmagic)) == NULL) { |
sizeof(struct magic) * |
file_oomem(ms); |
maxmagic)) == NULL) { |
if (*magicp) |
warn("malloc"); |
free(*magicp); |
if (check) { |
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if (magic) |
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free(magic); |
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return -1; |
return -1; |
} else |
} |
exit(1); |
*magicp = m; |
} |
memset(&(*magicp)[*nmagicp], 0, sizeof(struct magic) |
magic = mtmp; |
* ALLOC_INCR); |
memset(&magic[*ndx], 0, sizeof(struct magic) * alloc_incr); |
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alloc_incr *= 2; |
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} |
} |
m = &magic[*ndx]; |
m = &(*magicp)[*nmagicp]; |
m->flag = 0; |
m->flag = 0; |
m->cont_level = 0; |
m->cont_level = 0; |
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} |
} |
if (m->cont_level != 0 && *l == '&') { |
if (m->cont_level != 0 && *l == '&') { |
++l; /* step over */ |
++l; /* step over */ |
m->flag |= ADD; |
m->flag |= OFFADD; |
} |
} |
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/* get offset, then skip over it */ |
/* get offset, then skip over it */ |
m->offset = (int) strtoul(l,&t,0); |
m->offset = (uint32_t)strtoul(l, &t, 0); |
if (l == t) |
if (l == t) |
warnx("offset %s invalid", l); |
if (ms->flags & MAGIC_CHECK) |
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file_magwarn("offset %s invalid", l); |
l = t; |
l = t; |
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if (m->flag & INDIR) { |
if (m->flag & INDIR) { |
m->in.type = LONG; |
m->in_type = FILE_LONG; |
m->in.offset = 0; |
m->in_offset = 0; |
/* |
/* |
* read [.lbs][+-]nnnnn) |
* read [.lbs][+-]nnnnn) |
*/ |
*/ |
if (*l == '.') { |
if (*l == '.') { |
l++; |
l++; |
switch (LOWCASE(*l)) { |
switch (*l) { |
case 'l': |
case 'l': |
m->in.type = LONG; |
m->in_type = FILE_LELONG; |
break; |
break; |
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case 'L': |
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m->in_type = FILE_BELONG; |
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break; |
case 'h': |
case 'h': |
case 's': |
case 's': |
m->in.type = SHORT; |
m->in_type = FILE_LESHORT; |
break; |
break; |
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case 'H': |
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case 'S': |
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m->in_type = FILE_BESHORT; |
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break; |
case 'c': |
case 'c': |
case 'b': |
case 'b': |
m->in.type = BYTE; |
case 'C': |
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case 'B': |
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m->in_type = FILE_BYTE; |
break; |
break; |
default: |
default: |
warnx("indirect offset type %c invalid", *l); |
if (ms->flags & MAGIC_CHECK) |
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file_magwarn( |
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"indirect offset type %c invalid", |
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*l); |
break; |
break; |
} |
} |
l++; |
l++; |
} |
} |
s = l; |
if (*l == '~') { |
if (*l == '+' || *l == '-') l++; |
m->in_op = FILE_OPINVERSE; |
if (isdigit((unsigned char)*l)) { |
l++; |
m->in.offset = strtoul(l, &t, 0); |
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if (*s == '-') m->in.offset = - m->in.offset; |
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} |
} |
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switch (*l) { |
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case '&': |
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m->in_op |= FILE_OPAND; |
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l++; |
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break; |
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case '|': |
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m->in_op |= FILE_OPOR; |
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l++; |
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break; |
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case '^': |
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m->in_op |= FILE_OPXOR; |
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l++; |
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break; |
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case '+': |
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m->in_op |= FILE_OPADD; |
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l++; |
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break; |
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case '-': |
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m->in_op |= FILE_OPMINUS; |
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l++; |
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break; |
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case '*': |
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m->in_op |= FILE_OPMULTIPLY; |
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l++; |
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break; |
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case '/': |
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m->in_op |= FILE_OPDIVIDE; |
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l++; |
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break; |
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case '%': |
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m->in_op |= FILE_OPMODULO; |
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l++; |
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break; |
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} |
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if (isdigit((unsigned char)*l)) |
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m->in_offset = (uint32_t)strtoul(l, &t, 0); |
else |
else |
t = l; |
t = l; |
if (*t++ != ')') |
if (*t++ != ')') |
warnx("missing ')' in indirect offset"); |
if (ms->flags & MAGIC_CHECK) |
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file_magwarn("missing ')' in indirect offset"); |
l = t; |
l = t; |
} |
} |
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#define NLESHORT 7 |
#define NLESHORT 7 |
#define NLELONG 6 |
#define NLELONG 6 |
#define NLEDATE 6 |
#define NLEDATE 6 |
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#define NPSTRING 7 |
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#define NLDATE 5 |
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#define NBELDATE 7 |
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#define NLELDATE 7 |
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#define NREGEX 5 |
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if (*l == 'u') { |
if (*l == 'u') { |
++l; |
++l; |
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} |
} |
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/* get type, skip it */ |
/* get type, skip it */ |
if (strncmp(l, "byte", NBYTE)==0) { |
if (strncmp(l, "char", NBYTE)==0) { /* HP/UX compat */ |
m->type = BYTE; |
m->type = FILE_BYTE; |
l += NBYTE; |
l += NBYTE; |
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} else if (strncmp(l, "byte", NBYTE)==0) { |
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m->type = FILE_BYTE; |
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l += NBYTE; |
} else if (strncmp(l, "short", NSHORT)==0) { |
} else if (strncmp(l, "short", NSHORT)==0) { |
m->type = SHORT; |
m->type = FILE_SHORT; |
l += NSHORT; |
l += NSHORT; |
} else if (strncmp(l, "long", NLONG)==0) { |
} else if (strncmp(l, "long", NLONG)==0) { |
m->type = LONG; |
m->type = FILE_LONG; |
l += NLONG; |
l += NLONG; |
} else if (strncmp(l, "string", NSTRING)==0) { |
} else if (strncmp(l, "string", NSTRING)==0) { |
m->type = STRING; |
m->type = FILE_STRING; |
l += NSTRING; |
l += NSTRING; |
} else if (strncmp(l, "date", NDATE)==0) { |
} else if (strncmp(l, "date", NDATE)==0) { |
m->type = DATE; |
m->type = FILE_DATE; |
l += NDATE; |
l += NDATE; |
} else if (strncmp(l, "beshort", NBESHORT)==0) { |
} else if (strncmp(l, "beshort", NBESHORT)==0) { |
m->type = BESHORT; |
m->type = FILE_BESHORT; |
l += NBESHORT; |
l += NBESHORT; |
} else if (strncmp(l, "belong", NBELONG)==0) { |
} else if (strncmp(l, "belong", NBELONG)==0) { |
m->type = BELONG; |
m->type = FILE_BELONG; |
l += NBELONG; |
l += NBELONG; |
} else if (strncmp(l, "bedate", NBEDATE)==0) { |
} else if (strncmp(l, "bedate", NBEDATE)==0) { |
m->type = BEDATE; |
m->type = FILE_BEDATE; |
l += NBEDATE; |
l += NBEDATE; |
} else if (strncmp(l, "leshort", NLESHORT)==0) { |
} else if (strncmp(l, "leshort", NLESHORT)==0) { |
m->type = LESHORT; |
m->type = FILE_LESHORT; |
l += NLESHORT; |
l += NLESHORT; |
} else if (strncmp(l, "lelong", NLELONG)==0) { |
} else if (strncmp(l, "lelong", NLELONG)==0) { |
m->type = LELONG; |
m->type = FILE_LELONG; |
l += NLELONG; |
l += NLELONG; |
} else if (strncmp(l, "ledate", NLEDATE)==0) { |
} else if (strncmp(l, "ledate", NLEDATE)==0) { |
m->type = LEDATE; |
m->type = FILE_LEDATE; |
l += NLEDATE; |
l += NLEDATE; |
|
} else if (strncmp(l, "pstring", NPSTRING)==0) { |
|
m->type = FILE_PSTRING; |
|
l += NPSTRING; |
|
} else if (strncmp(l, "ldate", NLDATE)==0) { |
|
m->type = FILE_LDATE; |
|
l += NLDATE; |
|
} else if (strncmp(l, "beldate", NBELDATE)==0) { |
|
m->type = FILE_BELDATE; |
|
l += NBELDATE; |
|
} else if (strncmp(l, "leldate", NLELDATE)==0) { |
|
m->type = FILE_LELDATE; |
|
l += NLELDATE; |
|
} else if (strncmp(l, "regex", NREGEX)==0) { |
|
m->type = FILE_REGEX; |
|
l += sizeof("regex"); |
} else { |
} else { |
warnx("type %s invalid", l); |
if (ms->flags & MAGIC_CHECK) |
|
file_magwarn("type %s invalid", l); |
return -1; |
return -1; |
} |
} |
/* New-style anding: "0 byte&0x80 =0x80 dynamically linked" */ |
/* New-style anding: "0 byte&0x80 =0x80 dynamically linked" */ |
if (*l == '&') { |
/* New and improved: ~ & | ^ + - * / % -- exciting, isn't it? */ |
|
if (*l == '~') { |
|
if (FILE_STRING != m->type && FILE_PSTRING != m->type) |
|
m->mask_op = FILE_OPINVERSE; |
++l; |
++l; |
m->mask = signextend(m, strtoul(l, &l, 0)); |
} |
eatsize(&l); |
if ((t = strchr(fops, *l)) != NULL) { |
} else |
uint32_t op = (uint32_t)(t - fops); |
m->mask = ~0L; |
if (op != FILE_OPDIVIDE || |
|
(FILE_STRING != m->type && FILE_PSTRING != m->type)) { |
|
++l; |
|
m->mask_op |= op; |
|
val = (uint32_t)strtoul(l, &l, 0); |
|
m->mask = file_signextend(ms, m, val); |
|
eatsize(&l); |
|
} else { |
|
m->mask = 0L; |
|
while (!isspace((unsigned char)*++l)) { |
|
switch (*l) { |
|
case CHAR_IGNORE_LOWERCASE: |
|
m->mask |= STRING_IGNORE_LOWERCASE; |
|
break; |
|
case CHAR_COMPACT_BLANK: |
|
m->mask |= STRING_COMPACT_BLANK; |
|
break; |
|
case CHAR_COMPACT_OPTIONAL_BLANK: |
|
m->mask |= |
|
STRING_COMPACT_OPTIONAL_BLANK; |
|
break; |
|
default: |
|
if (ms->flags & MAGIC_CHECK) |
|
file_magwarn( |
|
"string extension %c invalid", |
|
*l); |
|
return -1; |
|
} |
|
} |
|
} |
|
} |
|
/* |
|
* We used to set mask to all 1's here, instead let's just not do |
|
* anything if mask = 0 (unless you have a better idea) |
|
*/ |
EATAB; |
EATAB; |
|
|
switch (*l) { |
switch (*l) { |
|
|
case '=': |
case '=': |
m->reln = *l; |
m->reln = *l; |
++l; |
++l; |
|
if (*l == '=') { |
|
/* HP compat: ignore &= etc. */ |
|
++l; |
|
} |
break; |
break; |
case '!': |
case '!': |
if (m->type != STRING) { |
if (m->type != FILE_STRING && m->type != FILE_PSTRING) { |
m->reln = *l; |
m->reln = *l; |
++l; |
++l; |
break; |
break; |
} |
} |
/* FALL THROUGH */ |
/*FALLTHROUGH*/ |
default: |
default: |
if (*l == 'x' && isascii((unsigned char)l[1]) && |
if (*l == 'x' && isascii((unsigned char)l[1]) && |
isspace((unsigned char)l[1])) { |
isspace((unsigned char)l[1])) { |
|
|
} |
} |
EATAB; |
EATAB; |
|
|
if (getvalue(m, &l)) |
if (getvalue(ms, m, &l)) |
return -1; |
return -1; |
/* |
/* |
* TODO finish this macro and start using it! |
* TODO finish this macro and start using it! |
* #define offsetcheck {if (offset > HOWMANY-1) |
* #define offsetcheck {if (offset > HOWMANY-1) |
* warnx("offset too big"); } |
* magwarn("offset too big"); } |
*/ |
*/ |
|
|
/* |
/* |
|
|
m->nospflag = 1; |
m->nospflag = 1; |
} else |
} else |
m->nospflag = 0; |
m->nospflag = 0; |
while ((m->desc[i++] = *l++) != '\0' && i<MAXDESC) |
while ((m->desc[i++] = *l++) != '\0' && i < MAXDESC) |
/* NULLBODY */; |
/* NULLBODY */; |
|
|
if (check) { |
#ifndef COMPILE_ONLY |
mdump(m); |
if (action == FILE_CHECK) { |
|
file_mdump(m); |
} |
} |
++(*ndx); /* make room for next */ |
#endif |
|
++(*nmagicp); /* make room for next */ |
return 0; |
return 0; |
} |
} |
|
|
|
|
* pointer, according to the magic type. Update the string pointer to point |
* pointer, according to the magic type. Update the string pointer to point |
* just after the number read. Return 0 for success, non-zero for failure. |
* just after the number read. Return 0 for success, non-zero for failure. |
*/ |
*/ |
static int |
private int |
getvalue(m, p) |
getvalue(struct magic_set *ms, struct magic *m, char **p) |
struct magic *m; |
|
char **p; |
|
{ |
{ |
int slen; |
int slen; |
|
|
if (m->type == STRING) { |
switch (m->type) { |
*p = getstr(*p, m->value.s, sizeof(m->value.s), &slen); |
case FILE_STRING: |
|
case FILE_PSTRING: |
|
case FILE_REGEX: |
|
*p = getstr(ms, *p, m->value.s, sizeof(m->value.s), &slen); |
|
if (*p == NULL) { |
|
if (ms->flags & MAGIC_CHECK) |
|
file_magwarn("cannot get string from `%s'", |
|
m->value.s); |
|
return -1; |
|
} |
m->vallen = slen; |
m->vallen = slen; |
} else |
return 0; |
|
default: |
if (m->reln != 'x') { |
if (m->reln != 'x') { |
m->value.l = signextend(m, strtoul(*p, p, 0)); |
m->value.l = file_signextend(ms, m, |
|
(uint32_t)strtoul(*p, p, 0)); |
eatsize(p); |
eatsize(p); |
} |
} |
return 0; |
return 0; |
|
} |
} |
} |
|
|
/* |
/* |
|
|
* Copy the converted version to "p", returning its length in *slen. |
* Copy the converted version to "p", returning its length in *slen. |
* Return updated scan pointer as function result. |
* Return updated scan pointer as function result. |
*/ |
*/ |
static char * |
private char * |
getstr(s, p, plen, slen) |
getstr(struct magic_set *ms, char *s, char *p, int plen, int *slen) |
char *s; |
|
char *p; |
|
int plen, *slen; |
|
{ |
{ |
char *origs = s, *origp = p; |
char *origs = s, *origp = p; |
char *pmax = p + plen - 1; |
char *pmax = p + plen - 1; |
|
|
if (isspace((unsigned char) c)) |
if (isspace((unsigned char) c)) |
break; |
break; |
if (p >= pmax) { |
if (p >= pmax) { |
fprintf(stderr, "String too long: %s\n", origs); |
file_error(ms, 0, "string too long: `%s'", origs); |
break; |
return NULL; |
} |
} |
if(c == '\\') { |
if(c == '\\') { |
switch(c = *s++) { |
switch(c = *s++) { |
|
|
|
|
|
|
/* Single hex char to int; -1 if not a hex char. */ |
/* Single hex char to int; -1 if not a hex char. */ |
static int |
private int |
hextoint(c) |
hextoint(int c) |
int c; |
|
{ |
{ |
if (!isascii((unsigned char) c)) return -1; |
if (!isascii((unsigned char) c)) |
if (isdigit((unsigned char) c)) return c - '0'; |
return -1; |
if ((c>='a')&&(c<='f')) return c + 10 - 'a'; |
if (isdigit((unsigned char) c)) |
if ((c>='A')&&(c<='F')) return c + 10 - 'A'; |
return c - '0'; |
return -1; |
if ((c >= 'a')&&(c <= 'f')) |
|
return c + 10 - 'a'; |
|
if (( c>= 'A')&&(c <= 'F')) |
|
return c + 10 - 'A'; |
|
return -1; |
} |
} |
|
|
|
|
/* |
/* |
* Print a string containing C character escapes. |
* Print a string containing C character escapes. |
*/ |
*/ |
void |
protected void |
showstr(fp, s, len) |
file_showstr(FILE *fp, const char *s, size_t len) |
FILE *fp; |
|
const char *s; |
|
int len; |
|
{ |
{ |
char c; |
char c; |
|
|
for (;;) { |
for (;;) { |
c = *s++; |
c = *s++; |
if (len == -1) { |
if (len == ~0U) { |
if (c == '\0') |
if (c == '\0') |
break; |
break; |
} |
} |
|
|
/* |
/* |
* eatsize(): Eat the size spec from a number [eg. 10UL] |
* eatsize(): Eat the size spec from a number [eg. 10UL] |
*/ |
*/ |
static void |
private void |
eatsize(p) |
eatsize(char **p) |
char **p; |
|
{ |
{ |
char *l = *p; |
char *l = *p; |
|
|
|
|
} |
} |
|
|
*p = l; |
*p = l; |
|
} |
|
|
|
/* |
|
* handle a compiled file. |
|
*/ |
|
private int |
|
apprentice_map(struct magic_set *ms, struct magic **magicp, uint32_t *nmagicp, |
|
const char *fn) |
|
{ |
|
int fd; |
|
struct stat st; |
|
uint32_t *ptr; |
|
uint32_t version; |
|
int needsbyteswap; |
|
char buf[MAXPATHLEN]; |
|
char *dbname = mkdbname(fn, buf, sizeof(buf)); |
|
void *mm = NULL; |
|
|
|
if (dbname == NULL) |
|
return -1; |
|
|
|
if ((fd = open(dbname, O_RDONLY)) == -1) |
|
return -1; |
|
|
|
if (fstat(fd, &st) == -1) { |
|
file_error(ms, errno, "cannot stat `%s'", dbname); |
|
goto error; |
|
} |
|
if (st.st_size < 16) { |
|
file_error(ms, 0, "file `%s' is too small", dbname); |
|
goto error; |
|
} |
|
|
|
#ifdef QUICK |
|
if ((mm = mmap(0, (size_t)st.st_size, PROT_READ|PROT_WRITE, |
|
MAP_PRIVATE|MAP_FILE, fd, (off_t)0)) == MAP_FAILED) { |
|
file_error(ms, errno, "cannot map `%s'", dbname); |
|
goto error; |
|
} |
|
#define RET 2 |
|
#else |
|
if ((mm = malloc((size_t)st.st_size)) == NULL) { |
|
file_oomem(ms); |
|
goto error; |
|
} |
|
if (read(fd, mm, (size_t)st.st_size) != (size_t)st.st_size) { |
|
file_badread(ms); |
|
goto error; |
|
} |
|
#define RET 1 |
|
#endif |
|
*magicp = mm; |
|
(void)close(fd); |
|
fd = -1; |
|
ptr = (uint32_t *)(void *)*magicp; |
|
if (*ptr != MAGICNO) { |
|
if (swap4(*ptr) != MAGICNO) { |
|
file_error(ms, 0, "bad magic in `%s'"); |
|
goto error; |
|
} |
|
needsbyteswap = 1; |
|
} else |
|
needsbyteswap = 0; |
|
if (needsbyteswap) |
|
version = swap4(ptr[1]); |
|
else |
|
version = ptr[1]; |
|
if (version != VERSIONNO) { |
|
file_error(ms, 0, "version mismatch (%d != %d) in `%s'", |
|
version, VERSIONNO, dbname); |
|
goto error; |
|
} |
|
*nmagicp = (uint32_t)(st.st_size / sizeof(struct magic)) - 1; |
|
(*magicp)++; |
|
if (needsbyteswap) |
|
byteswap(*magicp, *nmagicp); |
|
return RET; |
|
|
|
error: |
|
if (fd != -1) |
|
(void)close(fd); |
|
if (mm) { |
|
#ifdef QUICK |
|
(void)munmap((void *)mm, (size_t)st.st_size); |
|
#else |
|
free(mm); |
|
#endif |
|
} else { |
|
*magicp = NULL; |
|
*nmagicp = 0; |
|
} |
|
return -1; |
|
} |
|
|
|
private const uint32_t ar[] = { |
|
MAGICNO, VERSIONNO |
|
}; |
|
/* |
|
* handle an mmaped file. |
|
*/ |
|
private int |
|
apprentice_compile(struct magic_set *ms, struct magic **magicp, |
|
uint32_t *nmagicp, const char *fn) |
|
{ |
|
int fd; |
|
char buf[MAXPATHLEN]; |
|
char *dbname = mkdbname(fn, buf, sizeof(buf)); |
|
|
|
if (dbname == NULL) |
|
return -1; |
|
|
|
if ((fd = open(dbname, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) { |
|
file_error(ms, errno, "cannot open `%s'", dbname); |
|
return -1; |
|
} |
|
|
|
if (write(fd, ar, sizeof(ar)) != (ssize_t)sizeof(ar)) { |
|
file_error(ms, errno, "error writing `%s'", dbname); |
|
return -1; |
|
} |
|
|
|
if (lseek(fd, (off_t)sizeof(struct magic), SEEK_SET) |
|
!= sizeof(struct magic)) { |
|
file_error(ms, errno, "error seeking `%s'", dbname); |
|
return -1; |
|
} |
|
|
|
if (write(fd, *magicp, (sizeof(struct magic) * *nmagicp)) |
|
!= (ssize_t)(sizeof(struct magic) * *nmagicp)) { |
|
file_error(ms, errno, "error writing `%s'", dbname); |
|
return -1; |
|
} |
|
|
|
(void)close(fd); |
|
return 0; |
|
} |
|
|
|
private const char ext[] = ".mgc"; |
|
/* |
|
* make a dbname |
|
*/ |
|
private char * |
|
mkdbname(const char *fn, char *buf, size_t bufsiz) |
|
{ |
|
#ifdef notdef |
|
const char *p; |
|
if ((p = strrchr(fn, '/')) != NULL) |
|
fn = ++p; |
|
#endif |
|
(void)snprintf(buf, bufsiz, "%s%s", fn, ext); |
|
return buf; |
|
} |
|
|
|
/* |
|
* Byteswap an mmap'ed file if needed |
|
*/ |
|
private void |
|
byteswap(struct magic *magic, uint32_t nmagic) |
|
{ |
|
uint32_t i; |
|
for (i = 0; i < nmagic; i++) |
|
bs1(&magic[i]); |
|
} |
|
|
|
/* |
|
* swap a short |
|
*/ |
|
private uint16_t |
|
swap2(uint16_t sv) |
|
{ |
|
uint16_t rv; |
|
uint8_t *s = (uint8_t *)(void *)&sv; |
|
uint8_t *d = (uint8_t *)(void *)&rv; |
|
d[0] = s[1]; |
|
d[1] = s[0]; |
|
return rv; |
|
} |
|
|
|
/* |
|
* swap an int |
|
*/ |
|
private uint32_t |
|
swap4(uint32_t sv) |
|
{ |
|
uint32_t rv; |
|
uint8_t *s = (uint8_t *)(void *)&sv; |
|
uint8_t *d = (uint8_t *)(void *)&rv; |
|
d[0] = s[3]; |
|
d[1] = s[2]; |
|
d[2] = s[1]; |
|
d[3] = s[0]; |
|
return rv; |
|
} |
|
|
|
/* |
|
* byteswap a single magic entry |
|
*/ |
|
private void |
|
bs1(struct magic *m) |
|
{ |
|
m->cont_level = swap2(m->cont_level); |
|
m->offset = swap4((uint32_t)m->offset); |
|
m->in_offset = swap4((uint32_t)m->in_offset); |
|
if (m->type != FILE_STRING) |
|
m->value.l = swap4(m->value.l); |
|
m->mask = swap4(m->mask); |
} |
} |