forked from radareorg/radare2
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apprentice.c
2036 lines (1911 loc) · 44.1 KB
/
apprentice.c
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/* $OpenBSD: apprentice.c,v 1.29 2009/11/11 16:21:51 jsg Exp $ */
/*
* 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.
*/
/*
* apprentice - make one pass through /etc/magic, learning its secrets.
*/
#include <r_userconf.h>
#if !USE_LIB_MAGIC
#include <r_util.h>
#include <ctype.h>
#ifndef _MSC_VER
#include <sys/param.h>
#endif
#if __UNIX__
#define QUICK 1
#include <sys/mman.h>
#endif
#include "file.h"
#include "patchlevel.h"
#ifdef _MSC_VER
#include <sys\stat.h>
#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#define MAXPATHLEN 255
#endif
#define EATAB {while (isascii((ut8) *l) && isspace((ut8) *l)) ++l;}
#define LOWCASE(l) (isupper((ut8) (l)) ? tolower((ut8) (l)) : (l))
#ifndef MAP_FILE
#define MAP_FILE 0
#endif
struct r_magic_entry {
struct r_magic *mp;
ut32 cont_count;
ut32 max_count;
};
static int magic_file_formats[FILE_NAMES_SIZE];
static const size_t file_nformats = FILE_NAMES_SIZE;
static const char *magic_file_names[FILE_NAMES_SIZE];
static const size_t file_nnames = FILE_NAMES_SIZE;
static int getvalue(RMagic *ms, struct r_magic *, const char **, int);
static int hextoint(int);
static const char *getstr(RMagic *, const char *, char *, int, int *, int);
static int parse(RMagic *, struct r_magic_entry **, ut32 *, const char *, size_t, int);
static int parse_mime(RMagic *, struct r_magic_entry **, ut32 *, const char *);
static void eatsize(const char **);
static int apprentice_1(RMagic *, const char *, int, struct mlist *);
static size_t apprentice_r_magic_strength(const struct r_magic *);
static int apprentice_sort(const void *, const void *);
static int apprentice_load(RMagic *, struct r_magic **, ut32 *, const char *, int);
static void byteswap(struct r_magic *, ut32);
static void bs1(struct r_magic *);
static ut16 swap2(ut16);
static ut32 swap4(ut32);
static ut64 swap8(ut64);
static char *mkdbname(const char *, int);
static int apprentice_map(RMagic *, struct r_magic **, ut32 *, const char *);
static int apprentice_compile(RMagic *, struct r_magic **, ut32 *, const char *);
static int check_format_type(const char *, int);
static int check_format(RMagic *, struct r_magic *);
static int get_op(char);
static size_t maxmagic = 0;
static size_t magicsize = sizeof (struct r_magic);
static const char usg_hdr[] = "cont\toffset\ttype\topcode\tmask\tvalue\tdesc";
static const char mime_marker[] = "!:mime";
static const size_t mime_marker_len = sizeof (mime_marker) - 1;
static const struct type_tbl_s {
const char name[16];
const size_t len;
const int type;
const int format;
} type_tbl[] = {
# define XX(s) s, (sizeof (s) - 1)
# define XX_NULL "", 0
{ XX("byte"), FILE_BYTE, FILE_FMT_NUM },
{ XX("short"), FILE_SHORT, FILE_FMT_NUM },
{ XX("default"), FILE_DEFAULT, FILE_FMT_STR },
{ XX("long"), FILE_LONG, FILE_FMT_NUM },
{ XX("string"), FILE_STRING, FILE_FMT_STR },
{ XX("date"), FILE_DATE, FILE_FMT_STR },
{ XX("beshort"), FILE_BESHORT, FILE_FMT_NUM },
{ XX("belong"), FILE_BELONG, FILE_FMT_NUM },
{ XX("bedate"), FILE_BEDATE, FILE_FMT_STR },
{ XX("leshort"), FILE_LESHORT, FILE_FMT_NUM },
{ XX("lelong"), FILE_LELONG, FILE_FMT_NUM },
{ XX("ledate"), FILE_LEDATE, FILE_FMT_STR },
{ XX("pstring"), FILE_PSTRING, FILE_FMT_STR },
{ XX("ldate"), FILE_LDATE, FILE_FMT_STR },
{ XX("beldate"), FILE_BELDATE, FILE_FMT_STR },
{ XX("leldate"), FILE_LELDATE, FILE_FMT_STR },
{ XX("regex"), FILE_REGEX, FILE_FMT_STR },
{ XX("bestring16"), FILE_BESTRING16, FILE_FMT_STR },
{ XX("lestring16"), FILE_LESTRING16, FILE_FMT_STR },
{ XX("search"), FILE_SEARCH, FILE_FMT_STR },
{ XX("medate"), FILE_MEDATE, FILE_FMT_STR },
{ XX("meldate"), FILE_MELDATE, FILE_FMT_STR },
{ XX("melong"), FILE_MELONG, FILE_FMT_NUM },
{ XX("quad"), FILE_QUAD, FILE_FMT_QUAD },
{ XX("lequad"), FILE_LEQUAD, FILE_FMT_QUAD },
{ XX("bequad"), FILE_BEQUAD, FILE_FMT_QUAD },
{ XX("qdate"), FILE_QDATE, FILE_FMT_STR },
{ XX("leqdate"), FILE_LEQDATE, FILE_FMT_STR },
{ XX("beqdate"), FILE_BEQDATE, FILE_FMT_STR },
{ XX("qldate"), FILE_QLDATE, FILE_FMT_STR },
{ XX("leqldate"), FILE_LEQLDATE, FILE_FMT_STR },
{ XX("beqldate"), FILE_BEQLDATE, FILE_FMT_STR },
{ XX("float"), FILE_FLOAT, FILE_FMT_FLOAT },
{ XX("befloat"), FILE_BEFLOAT, FILE_FMT_FLOAT },
{ XX("lefloat"), FILE_LEFLOAT, FILE_FMT_FLOAT },
{ XX("double"), FILE_DOUBLE, FILE_FMT_DOUBLE },
{ XX("bedouble"), FILE_BEDOUBLE, FILE_FMT_DOUBLE },
{ XX("ledouble"), FILE_LEDOUBLE, FILE_FMT_DOUBLE },
{ XX_NULL, FILE_INVALID, FILE_FMT_NONE },
# undef XX
# undef XX_NULL
};
static int get_type(const char *l, const char **t) {
const struct type_tbl_s *p;
for (p = type_tbl; p->len; p++) {
if (strncmp (l, p->name, p->len) == 0) {
if (t) {
*t = l + p->len;
}
break;
}
}
return p->type;
}
static void init_file_tables(void) {
static int done = 0;
const struct type_tbl_s *p;
if (done) {
return;
}
done++;
for (p = type_tbl; p->len; p++) {
if (p->type >= FILE_NAMES_SIZE) {
continue;
}
magic_file_names[p->type] = p->name;
magic_file_formats[p->type] = p->format;
}
}
/*
* Handle one file or directory.
*/
static int apprentice_1(RMagic *ms, const char *fn, int action, struct mlist *mlist) {
struct r_magic *magic = NULL;
ut32 nmagic = 0;
struct mlist *ml;
int rv = -1;
int mapped;
if (!ms) {
return -1;
}
ms->haderr = 0;
if (magicsize != FILE_MAGICSIZE) {
file_error(ms, 0, "magic element size %lu != %lu",
(unsigned long)(size_t)sizeof (*magic),
(unsigned long)FILE_MAGICSIZE);
return -1;
}
ms->file = fn; // fix use of ms->file before being initialized
if (action == FILE_COMPILE) {
rv = apprentice_load (ms, &magic, &nmagic, fn, action);
if (rv != 0) {
return -1;
}
rv = apprentice_compile (ms, &magic, &nmagic, fn);
free (magic);
return rv;
}
if ((rv = apprentice_map (ms, &magic, &nmagic, fn)) == -1) {
//if (ms->flags & R_MAGIC_CHECK)
// file_magwarn(ms, "using regular magic file `%s'", fn);
rv = apprentice_load (ms, &magic, &nmagic, fn, action);
if (rv != 0) {
return -1;
}
}
mapped = rv;
if (!magic) {
file_delmagic (magic, mapped, nmagic);
return -1;
}
if (!(ml = malloc (sizeof (*ml)))) {
file_delmagic (magic, mapped, nmagic);
file_oomem (ms, sizeof (*ml));
return -1;
}
ml->magic = magic;
ml->nmagic = nmagic;
ml->mapped = mapped;
mlist->prev->next = ml;
ml->prev = mlist->prev;
ml->next = mlist;
mlist->prev = ml;
return 0;
}
void file_delmagic(struct r_magic *p, int type, size_t entries) {
if (p) {
switch (type) {
#ifdef QUICK
case 2:
p--;
(void)munmap ((void *)p, sizeof (*p) * (entries + 1));
break;
#endif
case 1:
p--;
/*FALLTHROUGH*/
case 0:
free (p);
p = NULL;
break;
default:
abort ();
}
}
}
/* const char *fn: list of magic files and directories */
struct mlist * file_apprentice(RMagic *ms, const char *fn, int action) {
char *p, *mfn;
int file_err, errs = -1;
struct mlist *mlist;
init_file_tables ();
if (!fn) {
fn = getenv ("MAGIC");
}
if (!fn) {
fn = MAGICFILE;
}
if (!(mfn = strdup (fn))) {
file_oomem (ms, strlen (fn));
return NULL;
}
fn = mfn;
if (!(mlist = malloc (sizeof (*mlist)))) {
free (mfn);
file_oomem (ms, sizeof (*mlist));
return NULL;
}
mlist->next = mlist->prev = mlist;
while (fn) {
p = strchr (fn, PATHSEP);
if (p) {
*p++ = '\0';
}
if (*fn == '\0') {
break;
}
file_err = apprentice_1 (ms, fn, action, mlist);
errs = R_MAX (errs, file_err);
fn = p;
}
if (errs == -1) {
free (mfn);
free (mlist);
mlist = NULL;
file_error (ms, 0, "could not find any magic files!");
return NULL;
}
free (mfn);
return mlist;
}
/*
* Get weight of this magic entry, for sorting purposes.
*/
static size_t apprentice_r_magic_strength(const struct r_magic *m) {
#define MULT 10
size_t val = 2 * MULT; /* baseline strength */
switch (m->type) {
case FILE_DEFAULT: /* make sure this sorts last */
return 0;
case FILE_BYTE:
val += 1 * MULT;
break;
case FILE_SHORT:
case FILE_LESHORT:
case FILE_BESHORT:
val += 2 * MULT;
break;
case FILE_LONG:
case FILE_LELONG:
case FILE_BELONG:
case FILE_MELONG:
val += 4 * MULT;
break;
case FILE_PSTRING:
case FILE_STRING:
val += m->vallen * MULT;
break;
case FILE_BESTRING16:
case FILE_LESTRING16:
val += m->vallen * MULT / 2;
break;
case FILE_SEARCH:
case FILE_REGEX:
val += m->vallen * R_MAX (MULT / m->vallen, 1);
break;
case FILE_DATE:
case FILE_LEDATE:
case FILE_BEDATE:
case FILE_MEDATE:
case FILE_LDATE:
case FILE_LELDATE:
case FILE_BELDATE:
case FILE_MELDATE:
case FILE_FLOAT:
case FILE_BEFLOAT:
case FILE_LEFLOAT:
val += 4 * MULT;
break;
case FILE_QUAD:
case FILE_BEQUAD:
case FILE_LEQUAD:
case FILE_QDATE:
case FILE_LEQDATE:
case FILE_BEQDATE:
case FILE_QLDATE:
case FILE_LEQLDATE:
case FILE_BEQLDATE:
case FILE_DOUBLE:
case FILE_BEDOUBLE:
case FILE_LEDOUBLE:
val += 8 * MULT;
break;
default:
val = 0;
eprintf ("Bad type %d\n", m->type);
abort();
}
switch (m->reln) {
case 'x': /* matches anything penalize */
case '!': /* matches almost anything penalize */
val = 0;
break;
case '=': /* Exact match, prefer */
val += MULT;
break;
case '>':
case '<': /* comparison match reduce strength */
val -= 2 * MULT;
break;
case '^':
case '&': /* masking bits, we could count them too */
val -= MULT;
break;
default:
eprintf ("Bad relation %c\n", m->reln);
abort();
}
return val? val: 1; /* ensure we only return 0 for FILE_DEFAULT */
}
/*
* Sort callback for sorting entries by "strength" (basically length)
*/
static int apprentice_sort(const void *a, const void *b) {
const struct r_magic_entry *ma = a;
const struct r_magic_entry *mb = b;
size_t sa = apprentice_r_magic_strength (ma->mp);
size_t sb = apprentice_r_magic_strength (mb->mp);
if (sa == sb) {
return 0;
}
if (sa > sb) {
return -1;
}
return 1;
}
static void set_test_type(struct r_magic *mstart, struct r_magic *m) {
switch (m->type) {
case FILE_BYTE:
case FILE_SHORT:
case FILE_LONG:
case FILE_DATE:
case FILE_BESHORT:
case FILE_BELONG:
case FILE_BEDATE:
case FILE_LESHORT:
case FILE_LELONG:
case FILE_LEDATE:
case FILE_LDATE:
case FILE_BELDATE:
case FILE_LELDATE:
case FILE_MEDATE:
case FILE_MELDATE:
case FILE_MELONG:
case FILE_QUAD:
case FILE_LEQUAD:
case FILE_BEQUAD:
case FILE_QDATE:
case FILE_LEQDATE:
case FILE_BEQDATE:
case FILE_QLDATE:
case FILE_LEQLDATE:
case FILE_BEQLDATE:
case FILE_FLOAT:
case FILE_BEFLOAT:
case FILE_LEFLOAT:
case FILE_DOUBLE:
case FILE_BEDOUBLE:
case FILE_LEDOUBLE:
case FILE_STRING:
case FILE_PSTRING:
case FILE_BESTRING16:
case FILE_LESTRING16:
/* binary test, set flag */
mstart->flag |= BINTEST;
break;
case FILE_REGEX:
case FILE_SEARCH:
/* binary test if pattern is not text */
if (file_looks_utf8 ((const ut8 *)m->value.s, m->vallen, NULL, NULL) == 0) {
mstart->flag |= BINTEST;
}
break;
case FILE_DEFAULT:
/* can't deduce anything; we shouldn't see this at the
top level anyway */
break;
case FILE_INVALID:
default:
/* invalid search type, but no need to complain here */
break;
}
}
/*
* Load and parse one file.
*/
static void load_1(RMagic *ms, int action, const char *file, int *errs, struct r_magic_entry **marray, ut32 *marraycount) {
char line[BUFSIZ];
size_t lineno = 0;
FILE *f = r_sandbox_fopen (ms->file = file, "r");
if (!f) {
if (errno != ENOENT) {
file_error (ms, errno, "cannot read magic file `%s'", file);
}
(*errs)++;
} else {
/* read and parse this file */
for (ms->line = 1; fgets (line, sizeof (line), f) != NULL; ms->line++) {
size_t len = strlen (line);
if (len == 0) { /* null line, garbage, etc */
continue;
}
if (line[len - 1] == '\n') {
lineno++;
line[len - 1] = '\0'; /* delete newline */
}
if (line[0] == '\0') { /* empty, do not parse */
continue;
}
if (line[0] == '#') { /* comment, do not parse */
continue;
}
if (len > mime_marker_len &&
memcmp (line, mime_marker, mime_marker_len) == 0) {
/* MIME type */
if (parse_mime (ms, marray, marraycount,
line + mime_marker_len) != 0) {
(*errs)++;
}
continue;
}
if (parse (ms, marray, marraycount, line, lineno, action) != 0) {
(*errs)++;
}
}
fclose (f);
}
}
/*
* parse a file or directory of files
* const char *fn: name of magic file or directory
*/
static int apprentice_load(RMagic *ms, struct r_magic **magicp, ut32 *nmagicp, const char *fn, int action) {
ut32 marraycount, i, mentrycount = 0, starttest;
struct r_magic_entry *marray;
struct stat st;
int errs = 0;
#if !__WINDOWS__
DIR *dir;
struct dirent *d;
char subfn[MAXPATHLEN];
#else
HANDLE hdir;
WIN32_FIND_DATAW entry;
wchar_t dir[MAX_PATH];
wchar_t *wcpath;
char *cfname;
char subfn[1024];
#endif
ms->flags |= R_MAGIC_CHECK; /* Enable checks for parsed files */
maxmagic = MAXMAGIS;
if (!(marray = calloc (maxmagic, sizeof (*marray)))) {
file_oomem (ms, maxmagic * sizeof (*marray));
return -1;
}
marraycount = 0;
/* print silly verbose header for USG compat. */
if (action == FILE_CHECK) {
eprintf ("%s\n", usg_hdr);
}
/* load directory or file */
if (stat (fn, &st) == 0 && S_ISDIR (st.st_mode)) {
if (r_sandbox_enable (0) && !r_sandbox_check_path (fn)) {
free (marray);
return -1;
}
#if __WINDOWS__ && !defined(__CYGWIN__)
if ((wcpath = r_utf8_to_utf16 (fn))) {
swprintf (dir, sizeof (dir), L"%ls\\*.*", wcpath);
hdir = FindFirstFileW (dir, &entry);
if (!(hdir == INVALID_HANDLE_VALUE)) {
do {
if (wcsncmp (entry.cFileName, L".", 1) == 0) continue;
if ((cfname = r_utf16_to_utf8 (entry.cFileName))) {
snprintf (subfn, sizeof (subfn), "%s/%s", fn, cfname);
if (stat (subfn, &st) == 0 && S_ISREG (st.st_mode)) {
load_1 (ms, action, subfn, &errs, &marray, &marraycount);
}
free (cfname);
}
} while (FindNextFileW (hdir, &entry));
FindClose (hdir);
}
free (wcpath);
} else {
errs++;
}
#else
dir = opendir (fn);
if (dir) {
while ((d = readdir (dir))) {
if (*d->d_name == '.') {
continue;
}
snprintf (subfn, sizeof (subfn), "%s/%s", fn, d->d_name);
if (stat (subfn, &st) == 0 && S_ISREG (st.st_mode)) {
load_1 (ms, action, subfn, &errs, &marray, &marraycount);
}
//else perror (subfn);
}
closedir (dir);
} else {
errs++;
}
#endif
} else {
load_1 (ms, action, fn, &errs, &marray, &marraycount);
}
if (errs) {
goto out;
}
/* Set types of tests */
for (i = 0; i < marraycount; ) {
if (marray[i].mp->cont_level != 0) {
i++;
continue;
}
starttest = i;
do {
set_test_type(marray[starttest].mp, marray[i].mp);
if (ms->flags & R_MAGIC_DEBUG) {
(void)fprintf(stderr, "%s%s%s: %s\n",
marray[i].mp->mimetype,
marray[i].mp->mimetype[0] == '\0' ? "" : "; ",
marray[i].mp->desc[0] ? marray[i].mp->desc : "(no description)",
marray[i].mp->flag & BINTEST ? "binary" : "text");
if (marray[i].mp->flag & BINTEST) {
#define SYMBOL "text"
#define SYMLEN sizeof (SYMBOL)
char *p = strstr(marray[i].mp->desc, "text");
if (p && (p == marray[i].mp->desc || isspace((unsigned char)p[-1])) &&
(p + SYMLEN - marray[i].mp->desc == MAXstring ||
(p[SYMLEN] == '\0' || isspace((unsigned char)p[SYMLEN])))) {
(void)fprintf(stderr,
"*** Possible binary test for text type\n");
}
#undef SYMBOL
#undef SYMLEN
}
}
} while (++i < marraycount && marray[i].mp->cont_level != 0);
}
qsort (marray, marraycount, sizeof (*marray), apprentice_sort);
/*
* Make sure that any level 0 "default" line is last (if one exists).
*/
for (i = 0; i < marraycount; i++) {
if (marray[i].mp->cont_level == 0 &&
marray[i].mp->type == FILE_DEFAULT) {
while (++i < marraycount) {
if (marray[i].mp->cont_level == 0) {
break;
}
}
if (i != marraycount) {
ms->line = marray[i].mp->lineno; /* XXX - Ugh! */
file_magwarn (ms, "level 0 \"default\" did not sort last");
}
break;
}
}
for (i = 0; i < marraycount; i++) {
mentrycount += marray[i].cont_count;
}
if (!(*magicp = malloc (1 + (sizeof (**magicp) * mentrycount)))) {
file_oomem (ms, sizeof (**magicp) * mentrycount);
errs++;
goto out;
}
mentrycount = 0;
for (i = 0; i < marraycount; i++) {
(void)memcpy (*magicp + mentrycount, marray[i].mp,
marray[i].cont_count * sizeof (**magicp));
mentrycount += marray[i].cont_count;
}
out:
for (i = 0; i < marraycount; i++) {
free (marray[i].mp);
}
free (marray);
if (errs) {
*magicp = NULL;
*nmagicp = 0;
return errs;
}
*nmagicp = mentrycount;
return 0;
}
/*
* extend the sign bit if the comparison is to be signed
*/
ut64 file_signextend(RMagic *ms, struct r_magic *m, ut64 v) {
if (!(m->flag & UNSIGNED)) {
switch (m->type) {
/*
* Do not remove the casts below. They are
* vital. When later compared with the data,
* the sign extension must have happened.
*/
case FILE_BYTE:
v = (char) v;
break;
case FILE_SHORT:
case FILE_BESHORT:
case FILE_LESHORT:
v = (short) v;
break;
case FILE_DATE:
case FILE_BEDATE:
case FILE_LEDATE:
case FILE_MEDATE:
case FILE_LDATE:
case FILE_BELDATE:
case FILE_LELDATE:
case FILE_MELDATE:
case FILE_LONG:
case FILE_BELONG:
case FILE_LELONG:
case FILE_MELONG:
case FILE_FLOAT:
case FILE_BEFLOAT:
case FILE_LEFLOAT:
v = (int32_t) v;
break;
case FILE_QUAD:
case FILE_BEQUAD:
case FILE_LEQUAD:
case FILE_QDATE:
case FILE_QLDATE:
case FILE_BEQDATE:
case FILE_BEQLDATE:
case FILE_LEQDATE:
case FILE_LEQLDATE:
case FILE_DOUBLE:
case FILE_BEDOUBLE:
case FILE_LEDOUBLE:
v = (int64_t) v;
break;
case FILE_STRING:
case FILE_PSTRING:
case FILE_BESTRING16:
case FILE_LESTRING16:
case FILE_REGEX:
case FILE_SEARCH:
case FILE_DEFAULT:
break;
default:
if (ms->flags & R_MAGIC_CHECK) {
file_magwarn (ms, "cannot happen: m->type=%d\n",
m->type);
}
return ~0U;
}
}
return v;
}
static int string_modifier_check(RMagic *ms, struct r_magic *m) {
if ((ms->flags & R_MAGIC_CHECK) == 0) {
return 0;
}
switch (m->type) {
case FILE_BESTRING16:
case FILE_LESTRING16:
if (m->str_flags != 0) {
file_magwarn(ms,
"no modifiers allowed for 16-bit strings\n");
return -1;
}
break;
case FILE_STRING:
case FILE_PSTRING:
if ((m->str_flags & REGEX_OFFSET_START) != 0) {
file_magwarn(ms,
"'/%c' only allowed on regex and search\n",
CHAR_REGEX_OFFSET_START);
return -1;
}
break;
case FILE_SEARCH:
if (m->str_range == 0) {
file_magwarn(ms,
"missing range; defaulting to %d\n",
STRING_DEFAULT_RANGE);
m->str_range = STRING_DEFAULT_RANGE;
return -1;
}
break;
case FILE_REGEX:
if ((m->str_flags & STRING_COMPACT_BLANK) != 0) {
file_magwarn(ms, "'/%c' not allowed on regex\n",
CHAR_COMPACT_BLANK);
return -1;
}
if ((m->str_flags & STRING_COMPACT_OPTIONAL_BLANK) != 0) {
file_magwarn(ms, "'/%c' not allowed on regex\n",
CHAR_COMPACT_OPTIONAL_BLANK);
return -1;
}
break;
default:
file_magwarn (ms, "coding error: m->type=%d\n",
m->type);
return -1;
}
return 0;
}
static int get_op(char c) {
switch (c) {
case '&': return FILE_OPAND;
case '|': return FILE_OPOR;
case '^': return FILE_OPXOR;
case '+': return FILE_OPADD;
case '-': return FILE_OPMINUS;
case '*': return FILE_OPMULTIPLY;
case '/': return FILE_OPDIVIDE;
case '%': return FILE_OPMODULO;
default: return -1;
}
}
static int get_cond(const char *l, const char **t) {
const struct cond_tbl_s *p;
static const struct cond_tbl_s {
char name[8];
size_t len;
int cond;
} cond_tbl[] = {
{ "if", 2, COND_IF },
{ "elif", 4, COND_ELIF },
{ "else", 4, COND_ELSE },
{ "", 0, COND_NONE },
};
for (p = cond_tbl; p->len; p++) {
if (strncmp (l, p->name, p->len) == 0 &&
isspace ((ut8)l[p->len])) {
if (t) {
*t = l + p->len;
}
break;
}
}
return p->cond;
}
static int check_cond(RMagic *ms, int cond, ut32 cont_level) {
int last_cond;
last_cond = ms->c.li[cont_level].last_cond;
switch (cond) {
case COND_IF:
if (last_cond != COND_NONE && last_cond != COND_ELIF) {
if (ms->flags & R_MAGIC_CHECK) {
file_magwarn (ms, "syntax error: `if'");
}
return -1;
}
last_cond = COND_IF;
break;
case COND_ELIF:
if (last_cond != COND_IF && last_cond != COND_ELIF) {
if (ms->flags & R_MAGIC_CHECK) {
file_magwarn (ms, "syntax error: `elif'");
}
return -1;
}
last_cond = COND_ELIF;
break;
case COND_ELSE:
if (last_cond != COND_IF && last_cond != COND_ELIF) {
if (ms->flags & R_MAGIC_CHECK) {
file_magwarn (ms, "syntax error: `else'");
}
return -1;
}
last_cond = COND_NONE;
break;
case COND_NONE:
last_cond = COND_NONE;
break;
}
ms->c.li[cont_level].last_cond = last_cond;
return 0;
}
/*
* parse one line from magic file, put into magic[index++] if valid
*/
static int parse(RMagic *ms, struct r_magic_entry **mentryp, ut32 *nmentryp, const char *line, size_t lineno, int action) {
static ut32 last_cont_level = 0;
size_t i;
struct r_magic_entry *me;
struct r_magic *m;
const char *l = line;
char *t;
int op;
ut32 cont_level = 0;
for (; *l == '>'; l++, cont_level++) {
;
}
if (cont_level == 0 || cont_level > last_cont_level) {
if (file_check_mem (ms, cont_level) == -1) {
return -1;
}
}
last_cont_level = cont_level;
#define ALLOC_CHUNK (size_t)10
#define ALLOC_INCR (size_t)200
if (cont_level != 0) {
if (*nmentryp == 0) {
file_error(ms, 0, "No current entry for continuation");
return -1;
}
me = &(*mentryp)[*nmentryp - 1];
if (me->cont_count == me->max_count) {
struct r_magic *nm;
size_t cnt = me->max_count + ALLOC_CHUNK;
if (!(nm = realloc(me->mp, sizeof (*nm) * cnt))) {
file_oomem(ms, sizeof (*nm) * cnt);
return -1;
}
me->mp = nm;
me->max_count = cnt;
}
m = &me->mp[me->cont_count++];
(void)memset(m, 0, sizeof (*m));
m->cont_level = cont_level;
} else {
if (*nmentryp == maxmagic) {
struct r_magic_entry *mp;
maxmagic += ALLOC_INCR;
if (!(mp = realloc (*mentryp, sizeof (*mp) * maxmagic))) {
file_oomem (ms, sizeof (*mp) * maxmagic);
return -1;
}
ut8 *p = (ut8*)&mp + *nmentryp;
(void)memset(p, 0, sizeof (*mp) * ALLOC_INCR);
*mentryp = mp;
}
me = &(*mentryp)[*nmentryp];
if (!me->mp) {
if (!(m = malloc (sizeof (*m) * ALLOC_CHUNK))) {
file_oomem (ms, sizeof (*m) * ALLOC_CHUNK);
return -1;
}
me->mp = m;
me->max_count = ALLOC_CHUNK;
} else {
m = me->mp;
}
(void)memset(m, 0, sizeof (*m));
m->cont_level = 0;
me->cont_count = 1;
}
m->lineno = lineno;
if (*l == '&') { /* m->cont_level == 0 checked below. */
++l; /* step over */
m->flag |= OFFADD;
}
if (*l == '(') {
++l; /* step over */
m->flag |= INDIR;
if (m->flag & OFFADD) {
m->flag = (m->flag & ~OFFADD) | INDIROFFADD;
}
if (*l == '&') { /* m->cont_level == 0 checked below */
++l; /* step over */
m->flag |= OFFADD;
}
}
/* Indirect offsets are not valid at level 0. */
if (m->cont_level == 0 && (m->flag & (OFFADD | INDIROFFADD))) {
if (ms->flags & R_MAGIC_CHECK) {
file_magwarn (ms, "relative offset at level 0");
}
}
/* get offset, then skip over it */