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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.
- */
- /*
- * softmagic - interpret variable magic from MAGIC
- */
- #include "file.h"
- #ifndef lint
- FILE_RCSID("@(#)$File: softmagic.c,v 1.243 2017/02/07 23:27:32 christos Exp $")
- #endif /* lint */
- #include "magic.h"
- #include <assert.h>
- #include <string.h>
- #include <ctype.h>
- #include <stdlib.h>
- #include <time.h>
- #include "der.h"
- private int match(struct magic_set *, struct magic *, uint32_t,
- const unsigned char *, size_t, size_t, int, int, int, uint16_t *,
- uint16_t *, int *, int *, int *);
- private int mget(struct magic_set *, const unsigned char *,
- struct magic *, size_t, size_t, unsigned int, int, int, int, uint16_t *,
- uint16_t *, int *, int *, int *);
- private int magiccheck(struct magic_set *, struct magic *);
- private int32_t mprint(struct magic_set *, struct magic *);
- private int moffset(struct magic_set *, struct magic *, size_t, int32_t *);
- private void mdebug(uint32_t, const char *, size_t);
- private int mcopy(struct magic_set *, union VALUETYPE *, int, int,
- const unsigned char *, uint32_t, size_t, struct magic *);
- private int mconvert(struct magic_set *, struct magic *, int);
- private int print_sep(struct magic_set *, int);
- private int handle_annotation(struct magic_set *, struct magic *, int);
- private int cvt_8(union VALUETYPE *, const struct magic *);
- private int cvt_16(union VALUETYPE *, const struct magic *);
- private int cvt_32(union VALUETYPE *, const struct magic *);
- private int cvt_64(union VALUETYPE *, const struct magic *);
- #define OFFSET_OOB(n, o, i) ((n) < (uint32_t)(o) || (i) > ((n) - (o)))
- #define BE64(p) (((uint64_t)(p)->hq[0]<<56)|((uint64_t)(p)->hq[1]<<48)| \
- ((uint64_t)(p)->hq[2]<<40)|((uint64_t)(p)->hq[3]<<32)| \
- ((uint64_t)(p)->hq[4]<<24)|((uint64_t)(p)->hq[5]<<16)| \
- ((uint64_t)(p)->hq[6]<<8)|((uint64_t)(p)->hq[7]))
- #define LE64(p) (((uint64_t)(p)->hq[7]<<56)|((uint64_t)(p)->hq[6]<<48)| \
- ((uint64_t)(p)->hq[5]<<40)|((uint64_t)(p)->hq[4]<<32)| \
- ((uint64_t)(p)->hq[3]<<24)|((uint64_t)(p)->hq[2]<<16)| \
- ((uint64_t)(p)->hq[1]<<8)|((uint64_t)(p)->hq[0]))
- #define LE32(p) (((uint32_t)(p)->hl[3]<<24)|((uint32_t)(p)->hl[2]<<16)| \
- ((uint32_t)(p)->hl[1]<<8)|((uint32_t)(p)->hl[0]))
- #define BE32(p) (((uint32_t)(p)->hl[0]<<24)|((uint32_t)(p)->hl[1]<<16)| \
- ((uint32_t)(p)->hl[2]<<8)|((uint32_t)(p)->hl[3]))
- #define ME32(p) (((uint32_t)(p)->hl[1]<<24)|((uint32_t)(p)->hl[0]<<16)| \
- ((uint32_t)(p)->hl[3]<<8)|((uint32_t)(p)->hl[2]))
- #define BE16(p) (((uint16_t)(p)->hs[0]<<8)|((uint16_t)(p)->hs[1]))
- #define LE16(p) (((uint16_t)(p)->hs[1]<<8)|((uint16_t)(p)->hs[0]))
- #define SEXT(s,v,p) ((s)?(intmax_t)(int##v##_t)(p):(intmax_t)(uint##v##_t)(p))
- /*
- * softmagic - lookup one file in parsed, in-memory copy of database
- * Passed the name and FILE * of one file to be typed.
- */
- /*ARGSUSED1*/ /* nbytes passed for regularity, maybe need later */
- protected int
- file_softmagic(struct magic_set *ms, const unsigned char *buf, size_t nbytes,
- uint16_t *indir_count, uint16_t *name_count, int mode, int text)
- {
- struct mlist *ml;
- int rv, printed_something = 0, need_separator = 0;
- uint16_t nc, ic;
- if (name_count == NULL) {
- nc = 0;
- name_count = &nc;
- }
- if (indir_count == NULL) {
- ic = 0;
- indir_count = ⁣
- }
- for (ml = ms->mlist[0]->next; ml != ms->mlist[0]; ml = ml->next)
- if ((rv = match(ms, ml->magic, ml->nmagic, buf, nbytes, 0, mode,
- text, 0, indir_count, name_count,
- &printed_something, &need_separator, NULL)) != 0)
- return rv;
- return 0;
- }
- #define FILE_FMTDEBUG
- #ifdef FILE_FMTDEBUG
- #define F(a, b, c) file_fmtcheck((a), (b), (c), __FILE__, __LINE__)
- private const char * __attribute__((__format_arg__(3)))
- file_fmtcheck(struct magic_set *ms, const struct magic *m, const char *def,
- const char *file, size_t line)
- {
- const char *ptr = fmtcheck(m->desc, def);
- if (ptr == def)
- file_magerror(ms,
- "%s, %" SIZE_T_FORMAT "u: format `%s' does not match"
- " with `%s'", file, line, m->desc, def);
- return ptr;
- }
- #else
- #define F(a, b, c) fmtcheck((b)->desc, (c))
- #endif
- /*
- * Go through the whole list, stopping if you find a match. Process all
- * the continuations of that match before returning.
- *
- * We support multi-level continuations:
- *
- * At any time when processing a successful top-level match, there is a
- * current continuation level; it represents the level of the last
- * successfully matched continuation.
- *
- * Continuations above that level are skipped as, if we see one, it
- * means that the continuation that controls them - i.e, the
- * lower-level continuation preceding them - failed to match.
- *
- * Continuations below that level are processed as, if we see one,
- * it means we've finished processing or skipping higher-level
- * continuations under the control of a successful or unsuccessful
- * lower-level continuation, and are now seeing the next lower-level
- * continuation and should process it. The current continuation
- * level reverts to the level of the one we're seeing.
- *
- * Continuations at the current level are processed as, if we see
- * one, there's no lower-level continuation that may have failed.
- *
- * If a continuation matches, we bump the current continuation level
- * so that higher-level continuations are processed.
- */
- private int
- match(struct magic_set *ms, struct magic *magic, uint32_t nmagic,
- const unsigned char *s, size_t nbytes, size_t offset, int mode, int text,
- int flip, uint16_t *indir_count, uint16_t *name_count,
- int *printed_something, int *need_separator, int *returnval)
- {
- uint32_t magindex = 0;
- unsigned int cont_level = 0;
- int returnvalv = 0, e; /* if a match is found it is set to 1*/
- int firstline = 1; /* a flag to print X\n X\n- X */
- int print = (ms->flags & MAGIC_NODESC) == 0;
- if (returnval == NULL)
- returnval = &returnvalv;
- if (file_check_mem(ms, cont_level) == -1)
- return -1;
- for (magindex = 0; magindex < nmagic; magindex++) {
- int flush = 0;
- struct magic *m = &magic[magindex];
- if (m->type != FILE_NAME)
- if ((IS_STRING(m->type) &&
- #define FLT (STRING_BINTEST | STRING_TEXTTEST)
- ((text && (m->str_flags & FLT) == STRING_BINTEST) ||
- (!text && (m->str_flags & FLT) == STRING_TEXTTEST))) ||
- (m->flag & mode) != mode) {
- flush:
- /* Skip sub-tests */
- while (magindex < nmagic - 1 &&
- magic[magindex + 1].cont_level != 0)
- magindex++;
- continue; /* Skip to next top-level test*/
- }
- ms->offset = m->offset;
- ms->line = m->lineno;
- /* if main entry matches, print it... */
- switch (mget(ms, s, m, nbytes, offset, cont_level, mode, text,
- flip, indir_count, name_count,
- printed_something, need_separator, returnval)) {
- case -1:
- return -1;
- case 0:
- flush = m->reln != '!';
- break;
- default:
- if (m->type == FILE_INDIRECT)
- *returnval = 1;
- switch (magiccheck(ms, m)) {
- case -1:
- return -1;
- case 0:
- flush++;
- break;
- default:
- flush = 0;
- break;
- }
- break;
- }
- if (flush) {
- /*
- * main entry didn't match,
- * flush its continuations
- */
- goto flush;
- }
- if ((e = handle_annotation(ms, m, firstline)) != 0) {
- *need_separator = 1;
- *printed_something = 1;
- *returnval = 1;
- return e;
- }
- /*
- * If we are going to print something, we'll need to print
- * a blank before we print something else.
- */
- if (*m->desc) {
- *need_separator = 1;
- *printed_something = 1;
- if (print_sep(ms, firstline) == -1)
- return -1;
- }
- if (print && mprint(ms, m) == -1)
- return -1;
- switch (moffset(ms, m, nbytes, &ms->c.li[cont_level].off)) {
- case -1:
- case 0:
- goto flush;
- default:
- break;
- }
- /* and any continuations that match */
- if (file_check_mem(ms, ++cont_level) == -1)
- return -1;
- while (magindex + 1 < nmagic &&
- magic[magindex + 1].cont_level != 0) {
- m = &magic[++magindex];
- ms->line = m->lineno; /* for messages */
- if (cont_level < m->cont_level)
- continue;
- if (cont_level > m->cont_level) {
- /*
- * We're at the end of the level
- * "cont_level" continuations.
- */
- cont_level = m->cont_level;
- }
- ms->offset = m->offset;
- if (m->flag & OFFADD) {
- ms->offset +=
- ms->c.li[cont_level - 1].off;
- }
- #ifdef ENABLE_CONDITIONALS
- if (m->cond == COND_ELSE ||
- m->cond == COND_ELIF) {
- if (ms->c.li[cont_level].last_match == 1)
- continue;
- }
- #endif
- switch (mget(ms, s, m, nbytes, offset, cont_level, mode,
- text, flip, indir_count, name_count,
- printed_something, need_separator, returnval)) {
- case -1:
- return -1;
- case 0:
- if (m->reln != '!')
- continue;
- flush = 1;
- break;
- default:
- if (m->type == FILE_INDIRECT)
- *returnval = 1;
- flush = 0;
- break;
- }
- switch (flush ? 1 : magiccheck(ms, m)) {
- case -1:
- return -1;
- case 0:
- #ifdef ENABLE_CONDITIONALS
- ms->c.li[cont_level].last_match = 0;
- #endif
- break;
- default:
- #ifdef ENABLE_CONDITIONALS
- ms->c.li[cont_level].last_match = 1;
- #endif
- if (m->type == FILE_CLEAR)
- ms->c.li[cont_level].got_match = 0;
- else if (ms->c.li[cont_level].got_match) {
- if (m->type == FILE_DEFAULT)
- break;
- } else
- ms->c.li[cont_level].got_match = 1;
- if ((e = handle_annotation(ms, m, firstline)) != 0) {
- *need_separator = 1;
- *printed_something = 1;
- *returnval = 1;
- return e;
- }
- /*
- * If we are going to print something,
- * make sure that we have a separator first.
- */
- if (*m->desc) {
- if (!*printed_something) {
- *printed_something = 1;
- if (print_sep(ms, firstline)
- == -1)
- return -1;
- }
- }
- /*
- * This continuation matched. Print
- * its message, with a blank before it
- * if the previous item printed and
- * this item isn't empty.
- */
- /* space if previous printed */
- if (*need_separator
- && ((m->flag & NOSPACE) == 0)
- && *m->desc) {
- if (print &&
- file_printf(ms, " ") == -1)
- return -1;
- *need_separator = 0;
- }
- if (print && mprint(ms, m) == -1)
- return -1;
- switch (moffset(ms, m, nbytes,
- &ms->c.li[cont_level].off)) {
- case -1:
- case 0:
- flush = 1;
- break;
- default:
- break;
- }
- if (*m->desc)
- *need_separator = 1;
- /*
- * If we see any continuations
- * at a higher level,
- * process them.
- */
- if (file_check_mem(ms, ++cont_level) == -1)
- return -1;
- break;
- }
- }
- if (*printed_something) {
- firstline = 0;
- if (print)
- *returnval = 1;
- }
- if ((ms->flags & MAGIC_CONTINUE) == 0 && *printed_something) {
- return *returnval; /* don't keep searching */
- }
- cont_level = 0;
- }
- return *returnval; /* This is hit if -k is set or there is no match */
- }
- private int
- check_fmt(struct magic_set *ms, struct magic *m)
- {
- file_regex_t rx;
- int rc, rv = -1;
- if (strchr(m->desc, '%') == NULL)
- return 0;
- rc = file_regcomp(&rx, "%[-0-9\\.]*s", REG_EXTENDED|REG_NOSUB);
- if (rc) {
- file_regerror(&rx, rc, ms);
- } else {
- rc = file_regexec(&rx, m->desc, 0, 0, 0);
- rv = !rc;
- }
- file_regfree(&rx);
- return rv;
- }
- #ifndef HAVE_STRNDUP
- char * strndup(const char *, size_t);
- char *
- strndup(const char *str, size_t n)
- {
- size_t len;
- char *copy;
- for (len = 0; len < n && str[len]; len++)
- continue;
- if ((copy = malloc(len + 1)) == NULL)
- return NULL;
- (void)memcpy(copy, str, len);
- copy[len] = '\0';
- return copy;
- }
- #endif /* HAVE_STRNDUP */
- private int32_t
- mprint(struct magic_set *ms, struct magic *m)
- {
- uint64_t v;
- float vf;
- double vd;
- int64_t t = 0;
- char buf[128], tbuf[26], sbuf[512];
- union VALUETYPE *p = &ms->ms_value;
- switch (m->type) {
- case FILE_BYTE:
- v = file_signextend(ms, m, (uint64_t)p->b);
- switch (check_fmt(ms, m)) {
- case -1:
- return -1;
- case 1:
- (void)snprintf(buf, sizeof(buf), "%d",
- (unsigned char)v);
- if (file_printf(ms, F(ms, m, "%s"), buf) == -1)
- return -1;
- break;
- default:
- if (file_printf(ms, F(ms, m, "%d"),
- (unsigned char) v) == -1)
- return -1;
- break;
- }
- t = ms->offset + sizeof(char);
- break;
- case FILE_SHORT:
- case FILE_BESHORT:
- case FILE_LESHORT:
- v = file_signextend(ms, m, (uint64_t)p->h);
- switch (check_fmt(ms, m)) {
- case -1:
- return -1;
- case 1:
- (void)snprintf(buf, sizeof(buf), "%u",
- (unsigned short)v);
- if (file_printf(ms, F(ms, m, "%s"), buf) == -1)
- return -1;
- break;
- default:
- if (file_printf(ms, F(ms, m, "%u"),
- (unsigned short) v) == -1)
- return -1;
- break;
- }
- t = ms->offset + sizeof(short);
- break;
- case FILE_LONG:
- case FILE_BELONG:
- case FILE_LELONG:
- case FILE_MELONG:
- v = file_signextend(ms, m, (uint64_t)p->l);
- switch (check_fmt(ms, m)) {
- case -1:
- return -1;
- case 1:
- (void)snprintf(buf, sizeof(buf), "%u", (uint32_t) v);
- if (file_printf(ms, F(ms, m, "%s"), buf) == -1)
- return -1;
- break;
- default:
- if (file_printf(ms, F(ms, m, "%u"), (uint32_t) v) == -1)
- return -1;
- break;
- }
- t = ms->offset + sizeof(int32_t);
- break;
- case FILE_QUAD:
- case FILE_BEQUAD:
- case FILE_LEQUAD:
- v = file_signextend(ms, m, p->q);
- switch (check_fmt(ms, m)) {
- case -1:
- return -1;
- case 1:
- (void)snprintf(buf, sizeof(buf), "%" INT64_T_FORMAT "u",
- (unsigned long long)v);
- if (file_printf(ms, F(ms, m, "%s"), buf) == -1)
- return -1;
- break;
- default:
- if (file_printf(ms, F(ms, m, "%" INT64_T_FORMAT "u"),
- (unsigned long long) v) == -1)
- return -1;
- break;
- }
- t = ms->offset + sizeof(int64_t);
- break;
- case FILE_STRING:
- case FILE_PSTRING:
- case FILE_BESTRING16:
- case FILE_LESTRING16:
- if (m->reln == '=' || m->reln == '!') {
- if (file_printf(ms, F(ms, m, "%s"),
- file_printable(sbuf, sizeof(sbuf), m->value.s))
- == -1)
- return -1;
- t = ms->offset + m->vallen;
- }
- else {
- char *str = p->s;
- /* compute t before we mangle the string? */
- t = ms->offset + strlen(str);
- if (*m->value.s == '\0')
- str[strcspn(str, "\r\n")] = '\0';
- if (m->str_flags & STRING_TRIM) {
- char *last;
- while (isspace((unsigned char)*str))
- str++;
- last = str;
- while (*last)
- last++;
- --last;
- while (isspace((unsigned char)*last))
- last--;
- *++last = '\0';
- }
- if (file_printf(ms, F(ms, m, "%s"),
- file_printable(sbuf, sizeof(sbuf), str)) == -1)
- return -1;
- if (m->type == FILE_PSTRING)
- t += file_pstring_length_size(m);
- }
- break;
- case FILE_DATE:
- case FILE_BEDATE:
- case FILE_LEDATE:
- case FILE_MEDATE:
- if (file_printf(ms, F(ms, m, "%s"),
- file_fmttime(p->l, 0, tbuf)) == -1)
- return -1;
- t = ms->offset + sizeof(uint32_t);
- break;
- case FILE_LDATE:
- case FILE_BELDATE:
- case FILE_LELDATE:
- case FILE_MELDATE:
- if (file_printf(ms, F(ms, m, "%s"),
- file_fmttime(p->l, FILE_T_LOCAL, tbuf)) == -1)
- return -1;
- t = ms->offset + sizeof(uint32_t);
- break;
- case FILE_QDATE:
- case FILE_BEQDATE:
- case FILE_LEQDATE:
- if (file_printf(ms, F(ms, m, "%s"),
- file_fmttime(p->q, 0, tbuf)) == -1)
- return -1;
- t = ms->offset + sizeof(uint64_t);
- break;
- case FILE_QLDATE:
- case FILE_BEQLDATE:
- case FILE_LEQLDATE:
- if (file_printf(ms, F(ms, m, "%s"),
- file_fmttime(p->q, FILE_T_LOCAL, tbuf)) == -1)
- return -1;
- t = ms->offset + sizeof(uint64_t);
- break;
- case FILE_QWDATE:
- case FILE_BEQWDATE:
- case FILE_LEQWDATE:
- if (file_printf(ms, F(ms, m, "%s"),
- file_fmttime(p->q, FILE_T_WINDOWS, tbuf)) == -1)
- return -1;
- t = ms->offset + sizeof(uint64_t);
- break;
- case FILE_FLOAT:
- case FILE_BEFLOAT:
- case FILE_LEFLOAT:
- vf = p->f;
- switch (check_fmt(ms, m)) {
- case -1:
- return -1;
- case 1:
- (void)snprintf(buf, sizeof(buf), "%g", vf);
- if (file_printf(ms, F(ms, m, "%s"), buf) == -1)
- return -1;
- break;
- default:
- if (file_printf(ms, F(ms, m, "%g"), vf) == -1)
- return -1;
- break;
- }
- t = ms->offset + sizeof(float);
- break;
- case FILE_DOUBLE:
- case FILE_BEDOUBLE:
- case FILE_LEDOUBLE:
- vd = p->d;
- switch (check_fmt(ms, m)) {
- case -1:
- return -1;
- case 1:
- (void)snprintf(buf, sizeof(buf), "%g", vd);
- if (file_printf(ms, F(ms, m, "%s"), buf) == -1)
- return -1;
- break;
- default:
- if (file_printf(ms, F(ms, m, "%g"), vd) == -1)
- return -1;
- break;
- }
- t = ms->offset + sizeof(double);
- break;
- case FILE_SEARCH:
- case FILE_REGEX: {
- char *cp;
- int rval;
- cp = strndup((const char *)ms->search.s, ms->search.rm_len);
- if (cp == NULL) {
- file_oomem(ms, ms->search.rm_len);
- return -1;
- }
- rval = file_printf(ms, F(ms, m, "%s"),
- file_printable(sbuf, sizeof(sbuf), cp));
- free(cp);
- if (rval == -1)
- return -1;
- if ((m->str_flags & REGEX_OFFSET_START))
- t = ms->search.offset;
- else
- t = ms->search.offset + ms->search.rm_len;
- break;
- }
- case FILE_DEFAULT:
- case FILE_CLEAR:
- if (file_printf(ms, "%s", m->desc) == -1)
- return -1;
- t = ms->offset;
- break;
- case FILE_INDIRECT:
- case FILE_USE:
- case FILE_NAME:
- t = ms->offset;
- break;
- case FILE_DER:
- if (file_printf(ms, F(ms, m, "%s"),
- file_printable(sbuf, sizeof(sbuf), ms->ms_value.s)) == -1)
- return -1;
- t = ms->offset;
- break;
- default:
- file_magerror(ms, "invalid m->type (%d) in mprint()", m->type);
- return -1;
- }
- return (int32_t)t;
- }
- private int
- moffset(struct magic_set *ms, struct magic *m, size_t nbytes, int32_t *op)
- {
- int32_t o;
- switch (m->type) {
- case FILE_BYTE:
- o = CAST(int32_t, (ms->offset + sizeof(char)));
- break;
- case FILE_SHORT:
- case FILE_BESHORT:
- case FILE_LESHORT:
- o = CAST(int32_t, (ms->offset + sizeof(short)));
- break;
- case FILE_LONG:
- case FILE_BELONG:
- case FILE_LELONG:
- case FILE_MELONG:
- o = CAST(int32_t, (ms->offset + sizeof(int32_t)));
- break;
- case FILE_QUAD:
- case FILE_BEQUAD:
- case FILE_LEQUAD:
- o = CAST(int32_t, (ms->offset + sizeof(int64_t)));
- break;
- case FILE_STRING:
- case FILE_PSTRING:
- case FILE_BESTRING16:
- case FILE_LESTRING16:
- if (m->reln == '=' || m->reln == '!') {
- o = ms->offset + m->vallen;
- } else {
- union VALUETYPE *p = &ms->ms_value;
- if (*m->value.s == '\0')
- p->s[strcspn(p->s, "\r\n")] = '\0';
- o = CAST(uint32_t, (ms->offset + strlen(p->s)));
- if (m->type == FILE_PSTRING)
- o += (uint32_t)file_pstring_length_size(m);
- }
- break;
- case FILE_DATE:
- case FILE_BEDATE:
- case FILE_LEDATE:
- case FILE_MEDATE:
- o = CAST(int32_t, (ms->offset + sizeof(uint32_t)));
- break;
- case FILE_LDATE:
- case FILE_BELDATE:
- case FILE_LELDATE:
- case FILE_MELDATE:
- o = CAST(int32_t, (ms->offset + sizeof(uint32_t)));
- break;
- case FILE_QDATE:
- case FILE_BEQDATE:
- case FILE_LEQDATE:
- o = CAST(int32_t, (ms->offset + sizeof(uint64_t)));
- break;
- case FILE_QLDATE:
- case FILE_BEQLDATE:
- case FILE_LEQLDATE:
- o = CAST(int32_t, (ms->offset + sizeof(uint64_t)));
- break;
- case FILE_FLOAT:
- case FILE_BEFLOAT:
- case FILE_LEFLOAT:
- o = CAST(int32_t, (ms->offset + sizeof(float)));
- break;
- case FILE_DOUBLE:
- case FILE_BEDOUBLE:
- case FILE_LEDOUBLE:
- o = CAST(int32_t, (ms->offset + sizeof(double)));
- break;
- case FILE_REGEX:
- if ((m->str_flags & REGEX_OFFSET_START) != 0)
- o = CAST(int32_t, ms->search.offset);
- else
- o = CAST(int32_t,
- (ms->search.offset + ms->search.rm_len));
- break;
- case FILE_SEARCH:
- if ((m->str_flags & REGEX_OFFSET_START) != 0)
- o = CAST(int32_t, ms->search.offset);
- else
- o = CAST(int32_t, (ms->search.offset + m->vallen));
- break;
- case FILE_CLEAR:
- case FILE_DEFAULT:
- case FILE_INDIRECT:
- o = ms->offset;
- break;
- case FILE_DER:
- {
- o = der_offs(ms, m, nbytes);
- if (o == -1 || (size_t)o > nbytes) {
- if ((ms->flags & MAGIC_DEBUG) != 0) {
- (void)fprintf(stderr,
- "Bad DER offset %d nbytes=%zu",
- o, nbytes);
- }
- *op = 0;
- return 0;
- }
- break;
- }
- default:
- o = 0;
- break;
- }
- if ((size_t)o > nbytes) {
- #if 0
- file_error(ms, 0, "Offset out of range %zu > %zu",
- (size_t)o, nbytes);
- #endif
- return -1;
- }
- *op = o;
- return 1;
- }
- private uint32_t
- cvt_id3(struct magic_set *ms, uint32_t v)
- {
- v = ((((v >> 0) & 0x7f) << 0) |
- (((v >> 8) & 0x7f) << 7) |
- (((v >> 16) & 0x7f) << 14) |
- (((v >> 24) & 0x7f) << 21));
- if ((ms->flags & MAGIC_DEBUG) != 0)
- fprintf(stderr, "id3 offs=%u\n", v);
- return v;
- }
- private int
- cvt_flip(int type, int flip)
- {
- if (flip == 0)
- return type;
- switch (type) {
- case FILE_BESHORT:
- return FILE_LESHORT;
- case FILE_BELONG:
- return FILE_LELONG;
- case FILE_BEDATE:
- return FILE_LEDATE;
- case FILE_BELDATE:
- return FILE_LELDATE;
- case FILE_BEQUAD:
- return FILE_LEQUAD;
- case FILE_BEQDATE:
- return FILE_LEQDATE;
- case FILE_BEQLDATE:
- return FILE_LEQLDATE;
- case FILE_BEQWDATE:
- return FILE_LEQWDATE;
- case FILE_LESHORT:
- return FILE_BESHORT;
- case FILE_LELONG:
- return FILE_BELONG;
- case FILE_LEDATE:
- return FILE_BEDATE;
- case FILE_LELDATE:
- return FILE_BELDATE;
- case FILE_LEQUAD:
- return FILE_BEQUAD;
- case FILE_LEQDATE:
- return FILE_BEQDATE;
- case FILE_LEQLDATE:
- return FILE_BEQLDATE;
- case FILE_LEQWDATE:
- return FILE_BEQWDATE;
- case FILE_BEFLOAT:
- return FILE_LEFLOAT;
- case FILE_LEFLOAT:
- return FILE_BEFLOAT;
- case FILE_BEDOUBLE:
- return FILE_LEDOUBLE;
- case FILE_LEDOUBLE:
- return FILE_BEDOUBLE;
- default:
- return type;
- }
- }
- #define DO_CVT(fld, cast) \
- if (m->num_mask) \
- switch (m->mask_op & FILE_OPS_MASK) { \
- case FILE_OPAND: \
- p->fld &= cast m->num_mask; \
- break; \
- case FILE_OPOR: \
- p->fld |= cast m->num_mask; \
- break; \
- case FILE_OPXOR: \
- p->fld ^= cast m->num_mask; \
- break; \
- case FILE_OPADD: \
- p->fld += cast m->num_mask; \
- break; \
- case FILE_OPMINUS: \
- p->fld -= cast m->num_mask; \
- break; \
- case FILE_OPMULTIPLY: \
- p->fld *= cast m->num_mask; \
- break; \
- case FILE_OPDIVIDE: \
- if (cast m->num_mask == 0) \
- return -1; \
- p->fld /= cast m->num_mask; \
- break; \
- case FILE_OPMODULO: \
- if (cast m->num_mask == 0) \
- return -1; \
- p->fld %= cast m->num_mask; \
- break; \
- } \
- if (m->mask_op & FILE_OPINVERSE) \
- p->fld = ~p->fld \
- private int
- cvt_8(union VALUETYPE *p, const struct magic *m)
- {
- DO_CVT(b, (uint8_t));
- return 0;
- }
- private int
- cvt_16(union VALUETYPE *p, const struct magic *m)
- {
- DO_CVT(h, (uint16_t));
- return 0;
- }
- private int
- cvt_32(union VALUETYPE *p, const struct magic *m)
- {
- DO_CVT(l, (uint32_t));
- return 0;
- }
- private int
- cvt_64(union VALUETYPE *p, const struct magic *m)
- {
- DO_CVT(q, (uint64_t));
- return 0;
- }
- #define DO_CVT2(fld, cast) \
- if (m->num_mask) \
- switch (m->mask_op & FILE_OPS_MASK) { \
- case FILE_OPADD: \
- p->fld += cast m->num_mask; \
- break; \
- case FILE_OPMINUS: \
- p->fld -= cast m->num_mask; \
- break; \
- case FILE_OPMULTIPLY: \
- p->fld *= cast m->num_mask; \
- break; \
- case FILE_OPDIVIDE: \
- if (cast m->num_mask == 0) \
- return -1; \
- p->fld /= cast m->num_mask; \
- break; \
- } \
- private int
- cvt_float(union VALUETYPE *p, const struct magic *m)
- {
- DO_CVT2(f, (float));
- return 0;
- }
- private int
- cvt_double(union VALUETYPE *p, const struct magic *m)
- {
- DO_CVT2(d, (double));
- return 0;
- }
- /*
- * Convert the byte order of the data we are looking at
- * While we're here, let's apply the mask operation
- * (unless you have a better idea)
- */
- private int
- mconvert(struct magic_set *ms, struct magic *m, int flip)
- {
- union VALUETYPE *p = &ms->ms_value;
- uint8_t type;
- switch (type = cvt_flip(m->type, flip)) {
- case FILE_BYTE:
- if (cvt_8(p, m) == -1)
- goto out;
- return 1;
- case FILE_SHORT:
- if (cvt_16(p, m) == -1)
- goto out;
- return 1;
- case FILE_LONG:
- case FILE_DATE:
- case FILE_LDATE:
- if (cvt_32(p, m) == -1)
- goto out;
- return 1;
- case FILE_QUAD:
- case FILE_QDATE:
- case FILE_QLDATE:
- case FILE_QWDATE:
- if (cvt_64(p, m) == -1)
- goto out;
- return 1;
- case FILE_STRING:
- case FILE_BESTRING16:
- case FILE_LESTRING16: {
- /* Null terminate and eat *trailing* return */
- p->s[sizeof(p->s) - 1] = '\0';
- return 1;
- }
- case FILE_PSTRING: {
- size_t sz = file_pstring_length_size(m);
- char *ptr1 = p->s, *ptr2 = ptr1 + sz;
- size_t len = file_pstring_get_length(m, ptr1);
- sz = sizeof(p->s) - sz; /* maximum length of string */
- if (len >= sz) {
- /*
- * The size of the pascal string length (sz)
- * is 1, 2, or 4. We need at least 1 byte for NUL
- * termination, but we've already truncated the
- * string by p->s, so we need to deduct sz.
- * Because we can use one of the bytes of the length
- * after we shifted as NUL termination.
- */
- len = sz;
- }
- while (len--)
- *ptr1++ = *ptr2++;
- *ptr1 = '\0';
- return 1;
- }
- case FILE_BESHORT:
- p->h = (short)BE16(p);
- if (cvt_16(p, m) == -1)
- goto out;
- return 1;
- case FILE_BELONG:
- case FILE_BEDATE:
- case FILE_BELDATE:
- p->l = (int32_t)BE32(p);
- if (cvt_32(p, m) == -1)
- goto out;
- return 1;
- case FILE_BEQUAD:
- case FILE_BEQDATE:
- case FILE_BEQLDATE:
- case FILE_BEQWDATE:
- p->q = (uint64_t)BE64(p);
- if (cvt_64(p, m) == -1)
- goto out;
- return 1;
- case FILE_LESHORT:
- p->h = (short)LE16(p);
- if (cvt_16(p, m) == -1)
- goto out;
- return 1;
- case FILE_LELONG:
- case FILE_LEDATE:
- case FILE_LELDATE:
- p->l = (int32_t)LE32(p);
- if (cvt_32(p, m) == -1)
- goto out;
- return 1;
- case FILE_LEQUAD:
- case FILE_LEQDATE:
- case FILE_LEQLDATE:
- case FILE_LEQWDATE:
- p->q = (uint64_t)LE64(p);
- if (cvt_64(p, m) == -1)
- goto out;
- return 1;
- case FILE_MELONG:
- case FILE_MEDATE:
- case FILE_MELDATE:
- p->l = (int32_t)ME32(p);
- if (cvt_32(p, m) == -1)
- goto out;
- return 1;
- case FILE_FLOAT:
- if (cvt_float(p, m) == -1)
- goto out;
- return 1;
- case FILE_BEFLOAT:
- p->l = BE32(p);
- if (cvt_float(p, m) == -1)
- goto out;
- return 1;
- case FILE_LEFLOAT:
- p->l = LE32(p);
- if (cvt_float(p, m) == -1)
- goto out;
- return 1;
- case FILE_DOUBLE:
- if (cvt_double(p, m) == -1)
- goto out;
- return 1;
- case FILE_BEDOUBLE:
- p->q = BE64(p);
- if (cvt_double(p, m) == -1)
- goto out;
- return 1;
- case FILE_LEDOUBLE:
- p->q = LE64(p);
- if (cvt_double(p, m) == -1)
- goto out;
- return 1;
- case FILE_REGEX:
- case FILE_SEARCH:
- case FILE_DEFAULT:
- case FILE_CLEAR:
- case FILE_NAME:
- case FILE_USE:
- case FILE_DER:
- return 1;
- default:
- file_magerror(ms, "invalid type %d in mconvert()", m->type);
- return 0;
- }
- out:
- file_magerror(ms, "zerodivide in mconvert()");
- return 0;
- }
- private void
- mdebug(uint32_t offset, const char *str, size_t len)
- {
- (void) fprintf(stderr, "mget/%" SIZE_T_FORMAT "u @%d: ", len, offset);
- file_showstr(stderr, str, len);
- (void) fputc('\n', stderr);
- (void) fputc('\n', stderr);
- }
- private int
- mcopy(struct magic_set *ms, union VALUETYPE *p, int type, int indir,
- const unsigned char *s, uint32_t offset, size_t nbytes, struct magic *m)
- {
- /*
- * Note: FILE_SEARCH and FILE_REGEX do not actually copy
- * anything, but setup pointers into the source
- */
- if (indir == 0) {
- switch (type) {
- case FILE_DER:
- case FILE_SEARCH:
- if (offset > nbytes)
- offset = nbytes;
- ms->search.s = RCAST(const char *, s) + offset;
- ms->search.s_len = nbytes - offset;
- ms->search.offset = offset;
- return 0;
- case FILE_REGEX: {
- const char *b;
- const char *c;
- const char *last; /* end of search region */
- const char *buf; /* start of search region */
- const char *end;
- size_t lines, linecnt, bytecnt;
- if (s == NULL) {
- ms->search.s_len = 0;
- ms->search.s = NULL;
- return 0;
- }
- if (m->str_flags & REGEX_LINE_COUNT) {
- linecnt = m->str_range;
- bytecnt = linecnt * 80;
- } else {
- linecnt = 0;
- bytecnt = m->str_range;
- }
- if (bytecnt == 0 || bytecnt > nbytes - offset)
- bytecnt = nbytes - offset;
- if (bytecnt > ms->regex_max)
- bytecnt = ms->regex_max;
- buf = RCAST(const char *, s) + offset;
- end = last = RCAST(const char *, s) + bytecnt + offset;
- /* mget() guarantees buf <= last */
- for (lines = linecnt, b = buf; lines && b < end &&
- ((b = CAST(const char *,
- memchr(c = b, '\n', CAST(size_t, (end - b)))))
- || (b = CAST(const char *,
- memchr(c, '\r', CAST(size_t, (end - c))))));
- lines--, b++) {
- last = b;
- if (b < end - 1 && b[0] == '\r' && b[1] == '\n')
- b++;
- }
- if (lines)
- last = RCAST(const char *, s) + bytecnt;
- ms->search.s = buf;
- ms->search.s_len = last - buf;
- ms->search.offset = offset;
- ms->search.rm_len = 0;
- return 0;
- }
- case FILE_BESTRING16:
- case FILE_LESTRING16: {
- const unsigned char *src = s + offset;
- const unsigned char *esrc = s + nbytes;
- char *dst = p->s;
- char *edst = &p->s[sizeof(p->s) - 1];
- if (type == FILE_BESTRING16)
- src++;
- /* check that offset is within range */
- if (offset >= nbytes)
- break;
- for (/*EMPTY*/; src < esrc; src += 2, dst++) {
- if (dst < edst)
- *dst = *src;
- else
- break;
- if (*dst == '\0') {
- if (type == FILE_BESTRING16 ?
- *(src - 1) != '\0' :
- ((src + 1 < esrc) &&
- *(src + 1) != '\0'))
- *dst = ' ';
- }
- }
- *edst = '\0';
- return 0;
- }
- case FILE_STRING: /* XXX - these two should not need */
- case FILE_PSTRING: /* to copy anything, but do anyway. */
- default:
- break;
- }
- }
- if (offset >= nbytes) {
- (void)memset(p, '\0', sizeof(*p));
- return 0;
- }
- if (nbytes - offset < sizeof(*p))
- nbytes = nbytes - offset;
- else
- nbytes = sizeof(*p);
- (void)memcpy(p, s + offset, nbytes);
- /*
- * the usefulness of padding with zeroes eludes me, it
- * might even cause problems
- */
- if (nbytes < sizeof(*p))
- (void)memset(((char *)(void *)p) + nbytes, '\0',
- sizeof(*p) - nbytes);
- return 0;
- }
- private uint32_t
- do_ops(struct magic *m, intmax_t lhs, intmax_t off)
- {
- intmax_t offset;
- if (off) {
- switch (m->in_op & FILE_OPS_MASK) {
- case FILE_OPAND:
- offset = lhs & off;
- break;
- case FILE_OPOR:
- offset = lhs | off;
- break;
- case FILE_OPXOR:
- offset = lhs ^ off;
- break;
- case FILE_OPADD:
- offset = lhs + off;
- break;
- case FILE_OPMINUS:
- offset = lhs - off;
- break;
- case FILE_OPMULTIPLY:
- offset = lhs * off;
- break;
- case FILE_OPDIVIDE:
- offset = lhs / off;
- break;
- case FILE_OPMODULO:
- offset = lhs % off;
- break;
- }
- } else
- offset = lhs;
- if (m->in_op & FILE_OPINVERSE)
- offset = ~offset;
- return (uint32_t)offset;
- }
- private int
- mget(struct magic_set *ms, const unsigned char *s, struct magic *m,
- size_t nbytes, size_t o, unsigned int cont_level, int mode, int text,
- int flip, uint16_t *indir_count, uint16_t *name_count,
- int *printed_something, int *need_separator, int *returnval)
- {
- uint32_t offset = ms->offset;
- intmax_t lhs;
- file_pushbuf_t *pb;
- int rv, oneed_separator, in_type;
- char *rbuf;
- union VALUETYPE *p = &ms->ms_value;
- struct mlist ml;
- if (*indir_count >= ms->indir_max) {
- file_error(ms, 0, "indirect count (%hu) exceeded",
- *indir_count);
- return -1;
- }
- if (*name_count >= ms->name_max) {
- file_error(ms, 0, "name use count (%hu) exceeded",
- *name_count);
- return -1;
- }
- if (mcopy(ms, p, m->type, m->flag & INDIR, s, (uint32_t)(offset + o),
- (uint32_t)nbytes, m) == -1)
- return -1;
- if ((ms->flags & MAGIC_DEBUG) != 0) {
- fprintf(stderr, "mget(type=%d, flag=%x, offset=%u, o=%"
- SIZE_T_FORMAT "u, " "nbytes=%" SIZE_T_FORMAT
- "u, il=%hu, nc=%hu)\n",
- m->type, m->flag, offset, o, nbytes,
- *indir_count, *name_count);
- mdebug(offset, (char *)(void *)p, sizeof(union VALUETYPE));
- #ifndef COMPILE_ONLY
- file_mdump(m);
- #endif
- }
- if (m->flag & INDIR) {
- intmax_t off = m->in_offset;
- const int sgn = m->in_op & FILE_OPSIGNED;
- if (m->in_op & FILE_OPINDIRECT) {
- const union VALUETYPE *q = CAST(const union VALUETYPE *,
- ((const void *)(s + offset + off)));
- if (OFFSET_OOB(nbytes, offset + off, sizeof(*q)))
- return 0;
- switch (cvt_flip(m->in_type, flip)) {
- case FILE_BYTE:
- off = SEXT(sgn,8,q->b);
- break;
- case FILE_SHORT:
- off = SEXT(sgn,16,q->h);
- break;
- case FILE_BESHORT:
- off = SEXT(sgn,16,BE16(q));
- break;
- case FILE_LESHORT:
- off = SEXT(sgn,16,LE16(q));
- break;
- case FILE_LONG:
- off = SEXT(sgn,32,q->l);
- break;
- case FILE_BELONG:
- case FILE_BEID3:
- off = SEXT(sgn,32,BE32(q));
- break;
- case FILE_LEID3:
- case FILE_LELONG:
- off = SEXT(sgn,32,LE32(q));
- break;
- case FILE_MELONG:
- off = SEXT(sgn,32,ME32(q));
- break;
- }
- if ((ms->flags & MAGIC_DEBUG) != 0)
- fprintf(stderr, "indirect offs=%jd\n", off);
- }
- switch (in_type = cvt_flip(m->in_type, flip)) {
- case FILE_BYTE:
- if (OFFSET_OOB(nbytes, offset, 1))
- return 0;
- offset = do_ops(m, SEXT(sgn,8,p->b), off);
- break;
- case FILE_BESHORT:
- if (OFFSET_OOB(nbytes, offset, 2))
- return 0;
- offset = do_ops(m, SEXT(sgn,16,BE16(p)), off);
- break;
- case FILE_LESHORT:
- if (OFFSET_OOB(nbytes, offset, 2))
- return 0;
- offset = do_ops(m, SEXT(sgn,16,LE16(p)), off);
- break;
- case FILE_SHORT:
- if (OFFSET_OOB(nbytes, offset, 2))
- return 0;
- offset = do_ops(m, SEXT(sgn,16,p->h), off);
- break;
- case FILE_BELONG:
- case FILE_BEID3:
- if (OFFSET_OOB(nbytes, offset, 4))
- return 0;
- lhs = BE32(p);
- if (in_type == FILE_BEID3)
- lhs = cvt_id3(ms, (uint32_t)lhs);
- offset = do_ops(m, SEXT(sgn,32,lhs), off);
- break;
- case FILE_LELONG:
- case FILE_LEID3:
- if (OFFSET_OOB(nbytes, offset, 4))
- return 0;
- lhs = LE32(p);
- if (in_type == FILE_LEID3)
- lhs = cvt_id3(ms, (uint32_t)lhs);
- offset = do_ops(m, SEXT(sgn,32,lhs), off);
- break;
- case FILE_MELONG:
- if (OFFSET_OOB(nbytes, offset, 4))
- return 0;
- offset = do_ops(m, SEXT(sgn,32,ME32(p)), off);
- break;
- case FILE_LONG:
- if (OFFSET_OOB(nbytes, offset, 4))
- return 0;
- offset = do_ops(m, SEXT(sgn,32,p->l), off);
- break;
- default:
- break;
- }
- if (m->flag & INDIROFFADD) {
- offset += ms->c.li[cont_level-1].off;
- if (offset == 0) {
- if ((ms->flags & MAGIC_DEBUG) != 0)
- fprintf(stderr,
- "indirect *zero* offset\n");
- return 0;
- }
- if ((ms->flags & MAGIC_DEBUG) != 0)
- fprintf(stderr, "indirect +offs=%u\n", offset);
- }
- if (mcopy(ms, p, m->type, 0, s, offset, nbytes, m) == -1)
- return -1;
- ms->offset = offset;
- if ((ms->flags & MAGIC_DEBUG) != 0) {
- mdebug(offset, (char *)(void *)p,
- sizeof(union VALUETYPE));
- #ifndef COMPILE_ONLY
- file_mdump(m);
- #endif
- }
- }
- /* Verify we have enough data to match magic type */
- switch (m->type) {
- case FILE_BYTE:
- if (OFFSET_OOB(nbytes, offset, 1))
- return 0;
- break;
- case FILE_SHORT:
- case FILE_BESHORT:
- case FILE_LESHORT:
- if (OFFSET_OOB(nbytes, offset, 2))
- return 0;
- break;
- case FILE_LONG:
- case FILE_BELONG:
- case FILE_LELONG:
- case FILE_MELONG:
- 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_FLOAT:
- case FILE_BEFLOAT:
- case FILE_LEFLOAT:
- if (OFFSET_OOB(nbytes, offset, 4))
- return 0;
- break;
- case FILE_DOUBLE:
- case FILE_BEDOUBLE:
- case FILE_LEDOUBLE:
- if (OFFSET_OOB(nbytes, offset, 8))
- return 0;
- break;
- case FILE_STRING:
- case FILE_PSTRING:
- case FILE_SEARCH:
- if (OFFSET_OOB(nbytes, offset, m->vallen))
- return 0;
- break;
- case FILE_REGEX:
- if (nbytes < offset)
- return 0;
- break;
- case FILE_INDIRECT:
- if (m->str_flags & INDIRECT_RELATIVE)
- offset += CAST(uint32_t, o);
- if (offset == 0)
- return 0;
- if (nbytes < offset)
- return 0;
- if ((pb = file_push_buffer(ms)) == NULL)
- return -1;
- (*indir_count)++;
- rv = file_softmagic(ms, s + offset, nbytes - offset,
- indir_count, name_count, BINTEST, text);
- if ((ms->flags & MAGIC_DEBUG) != 0)
- fprintf(stderr, "indirect @offs=%u[%d]\n", offset, rv);
- rbuf = file_pop_buffer(ms, pb);
- if (rbuf == NULL && ms->event_flags & EVENT_HAD_ERR)
- return -1;
- if (rv == 1) {
- if ((ms->flags & MAGIC_NODESC) == 0 &&
- file_printf(ms, F(ms, m, "%u"), offset) == -1) {
- free(rbuf);
- return -1;
- }
- if (file_printf(ms, "%s", rbuf) == -1) {
- free(rbuf);
- return -1;
- }
- }
- free(rbuf);
- return rv;
- case FILE_USE:
- if (nbytes < offset)
- return 0;
- rbuf = m->value.s;
- if (*rbuf == '^') {
- rbuf++;
- flip = !flip;
- }
- if (file_magicfind(ms, rbuf, &ml) == -1) {
- file_error(ms, 0, "cannot find entry `%s'", rbuf);
- return -1;
- }
- (*name_count)++;
- oneed_separator = *need_separator;
- if (m->flag & NOSPACE)
- *need_separator = 0;
- rv = match(ms, ml.magic, ml.nmagic, s, nbytes, offset + o,
- mode, text, flip, indir_count, name_count,
- printed_something, need_separator, returnval);
- if (rv != 1)
- *need_separator = oneed_separator;
- return 1;
- case FILE_NAME:
- if (ms->flags & MAGIC_NODESC)
- return 1;
- if (file_printf(ms, "%s", m->desc) == -1)
- return -1;
- return 1;
- case FILE_DER:
- case FILE_DEFAULT: /* nothing to check */
- case FILE_CLEAR:
- default:
- break;
- }
- if (!mconvert(ms, m, flip))
- return 0;
- return 1;
- }
- private uint64_t
- file_strncmp(const char *s1, const char *s2, size_t len, uint32_t flags)
- {
- /*
- * Convert the source args to unsigned here so that (1) the
- * compare will be unsigned as it is in strncmp() and (2) so
- * the ctype functions will work correctly without extra
- * casting.
- */
- const unsigned char *a = (const unsigned char *)s1;
- const unsigned char *b = (const unsigned char *)s2;
- uint64_t v;
- /*
- * What we want here is v = strncmp(s1, s2, len),
- * but ignoring any nulls.
- */
- v = 0;
- if (0L == flags) { /* normal string: do it fast */
- while (len-- > 0)
- if ((v = *b++ - *a++) != '\0')
- break;
- }
- else { /* combine the others */
- while (len-- > 0) {
- if ((flags & STRING_IGNORE_LOWERCASE) &&
- islower(*a)) {
- if ((v = tolower(*b++) - *a++) != '\0')
- break;
- }
- else if ((flags & STRING_IGNORE_UPPERCASE) &&
- isupper(*a)) {
- if ((v = toupper(*b++) - *a++) != '\0')
- break;
- }
- else if ((flags & STRING_COMPACT_WHITESPACE) &&
- isspace(*a)) {
- a++;
- if (isspace(*b++)) {
- if (!isspace(*a))
- while (isspace(*b))
- b++;
- }
- else {
- v = 1;
- break;
- }
- }
- else if ((flags & STRING_COMPACT_OPTIONAL_WHITESPACE) &&
- isspace(*a)) {
- a++;
- while (isspace(*b))
- b++;
- }
- else {
- if ((v = *b++ - *a++) != '\0')
- break;
- }
- }
- }
- return v;
- }
- private uint64_t
- file_strncmp16(const char *a, const char *b, size_t len, uint32_t flags)
- {
- /*
- * XXX - The 16-bit string compare probably needs to be done
- * differently, especially if the flags are to be supported.
- * At the moment, I am unsure.
- */
- flags = 0;
- return file_strncmp(a, b, len, flags);
- }
- private int
- magiccheck(struct magic_set *ms, struct magic *m)
- {
- uint64_t l = m->value.q;
- uint64_t v;
- float fl, fv;
- double dl, dv;
- int matched;
- union VALUETYPE *p = &ms->ms_value;
- switch (m->type) {
- case FILE_BYTE:
- v = p->b;
- break;
- case FILE_SHORT:
- case FILE_BESHORT:
- case FILE_LESHORT:
- v = p->h;
- break;
- case FILE_LONG:
- case FILE_BELONG:
- case FILE_LELONG:
- case FILE_MELONG:
- case FILE_DATE:
- case FILE_BEDATE:
- case FILE_LEDATE:
- case FILE_MEDATE:
- case FILE_LDATE:
- case FILE_BELDATE:
- case FILE_LELDATE:
- case FILE_MELDATE:
- v = p->l;
- break;
- case FILE_QUAD:
- case FILE_LEQUAD:
- case FILE_BEQUAD:
- case FILE_QDATE:
- case FILE_BEQDATE:
- case FILE_LEQDATE:
- case FILE_QLDATE:
- case FILE_BEQLDATE:
- case FILE_LEQLDATE:
- case FILE_QWDATE:
- case FILE_BEQWDATE:
- case FILE_LEQWDATE:
- v = p->q;
- break;
- case FILE_FLOAT:
- case FILE_BEFLOAT:
- case FILE_LEFLOAT:
- fl = m->value.f;
- fv = p->f;
- switch (m->reln) {
- case 'x':
- matched = 1;
- break;
- case '!':
- matched = fv != fl;
- break;
- case '=':
- matched = fv == fl;
- break;
- case '>':
- matched = fv > fl;
- break;
- case '<':
- matched = fv < fl;
- break;
- default:
- file_magerror(ms, "cannot happen with float: invalid relation `%c'",
- m->reln);
- return -1;
- }
- return matched;
- case FILE_DOUBLE:
- case FILE_BEDOUBLE:
- case FILE_LEDOUBLE:
- dl = m->value.d;
- dv = p->d;
- switch (m->reln) {
- case 'x':
- matched = 1;
- break;
- case '!':
- matched = dv != dl;
- break;
- case '=':
- matched = dv == dl;
- break;
- case '>':
- matched = dv > dl;
- break;
- case '<':
- matched = dv < dl;
- break;
- default:
- file_magerror(ms, "cannot happen with double: invalid relation `%c'", m->reln);
- return -1;
- }
- return matched;
- case FILE_DEFAULT:
- case FILE_CLEAR:
- l = 0;
- v = 0;
- break;
- case FILE_STRING:
- case FILE_PSTRING:
- l = 0;
- v = file_strncmp(m->value.s, p->s, (size_t)m->vallen, m->str_flags);
- break;
- case FILE_BESTRING16:
- case FILE_LESTRING16:
- l = 0;
- v = file_strncmp16(m->value.s, p->s, (size_t)m->vallen, m->str_flags);
- break;
- case FILE_SEARCH: { /* search ms->search.s for the string m->value.s */
- size_t slen;
- size_t idx;
- if (ms->search.s == NULL)
- return 0;
- slen = MIN(m->vallen, sizeof(m->value.s));
- l = 0;
- v = 0;
- for (idx = 0; m->str_range == 0 || idx < m->str_range; idx++) {
- if (slen + idx >= ms->search.s_len)
- return 0;
- v = file_strncmp(m->value.s, ms->search.s + idx, slen,
- m->str_flags);
- if (v == 0) { /* found match */
- ms->search.offset += idx;
- ms->search.rm_len = ms->search.s_len - idx;
- break;
- }
- }
- break;
- }
- case FILE_REGEX: {
- int rc;
- file_regex_t rx;
- const char *search;
- if (ms->search.s == NULL)
- return 0;
- l = 0;
- rc = file_regcomp(&rx, m->value.s,
- REG_EXTENDED|REG_NEWLINE|
- ((m->str_flags & STRING_IGNORE_CASE) ? REG_ICASE : 0));
- if (rc) {
- file_regerror(&rx, rc, ms);
- v = (uint64_t)-1;
- } else {
- regmatch_t pmatch;
- size_t slen = ms->search.s_len;
- char *copy;
- if (slen != 0) {
- copy = CAST(char *, malloc(slen));
- if (copy == NULL) {
- file_regfree(&rx);
- file_error(ms, errno,
- "can't allocate %" SIZE_T_FORMAT "u bytes",
- slen);
- return -1;
- }
- memcpy(copy, ms->search.s, slen);
- copy[--slen] = '\0';
- search = copy;
- } else {
- search = CCAST(char *, "");
- copy = NULL;
- }
- rc = file_regexec(&rx, (const char *)search,
- 1, &pmatch, 0);
- free(copy);
- switch (rc) {
- case 0:
- ms->search.s += (int)pmatch.rm_so;
- ms->search.offset += (size_t)pmatch.rm_so;
- ms->search.rm_len =
- (size_t)(pmatch.rm_eo - pmatch.rm_so);
- v = 0;
- break;
- case REG_NOMATCH:
- v = 1;
- break;
- default:
- file_regerror(&rx, rc, ms);
- v = (uint64_t)-1;
- break;
- }
- }
- file_regfree(&rx);
- if (v == (uint64_t)-1)
- return -1;
- break;
- }
- case FILE_INDIRECT:
- case FILE_USE:
- case FILE_NAME:
- return 1;
- case FILE_DER:
- matched = der_cmp(ms, m);
- if (matched == -1) {
- if ((ms->flags & MAGIC_DEBUG) != 0) {
- (void) fprintf(stderr,
- "EOF comparing DER entries");
- }
- return 0;
- }
- return matched;
- default:
- file_magerror(ms, "invalid type %d in magiccheck()", m->type);
- return -1;
- }
- v = file_signextend(ms, m, v);
- switch (m->reln) {
- case 'x':
- if ((ms->flags & MAGIC_DEBUG) != 0)
- (void) fprintf(stderr, "%" INT64_T_FORMAT
- "u == *any* = 1\n", (unsigned long long)v);
- matched = 1;
- break;
- case '!':
- matched = v != l;
- if ((ms->flags & MAGIC_DEBUG) != 0)
- (void) fprintf(stderr, "%" INT64_T_FORMAT "u != %"
- INT64_T_FORMAT "u = %d\n", (unsigned long long)v,
- (unsigned long long)l, matched);
- break;
- case '=':
- matched = v == l;
- if ((ms->flags & MAGIC_DEBUG) != 0)
- (void) fprintf(stderr, "%" INT64_T_FORMAT "u == %"
- INT64_T_FORMAT "u = %d\n", (unsigned long long)v,
- (unsigned long long)l, matched);
- break;
- case '>':
- if (m->flag & UNSIGNED) {
- matched = v > l;
- if ((ms->flags & MAGIC_DEBUG) != 0)
- (void) fprintf(stderr, "%" INT64_T_FORMAT
- "u > %" INT64_T_FORMAT "u = %d\n",
- (unsigned long long)v,
- (unsigned long long)l, matched);
- }
- else {
- matched = (int64_t) v > (int64_t) l;
- if ((ms->flags & MAGIC_DEBUG) != 0)
- (void) fprintf(stderr, "%" INT64_T_FORMAT
- "d > %" INT64_T_FORMAT "d = %d\n",
- (long long)v, (long long)l, matched);
- }
- break;
- case '<':
- if (m->flag & UNSIGNED) {
- matched = v < l;
- if ((ms->flags & MAGIC_DEBUG) != 0)
- (void) fprintf(stderr, "%" INT64_T_FORMAT
- "u < %" INT64_T_FORMAT "u = %d\n",
- (unsigned long long)v,
- (unsigned long long)l, matched);
- }
- else {
- matched = (int64_t) v < (int64_t) l;
- if ((ms->flags & MAGIC_DEBUG) != 0)
- (void) fprintf(stderr, "%" INT64_T_FORMAT
- "d < %" INT64_T_FORMAT "d = %d\n",
- (long long)v, (long long)l, matched);
- }
- break;
- case '&':
- matched = (v & l) == l;
- if ((ms->flags & MAGIC_DEBUG) != 0)
- (void) fprintf(stderr, "((%" INT64_T_FORMAT "x & %"
- INT64_T_FORMAT "x) == %" INT64_T_FORMAT
- "x) = %d\n", (unsigned long long)v,
- (unsigned long long)l, (unsigned long long)l,
- matched);
- break;
- case '^':
- matched = (v & l) != l;
- if ((ms->flags & MAGIC_DEBUG) != 0)
- (void) fprintf(stderr, "((%" INT64_T_FORMAT "x & %"
- INT64_T_FORMAT "x) != %" INT64_T_FORMAT
- "x) = %d\n", (unsigned long long)v,
- (unsigned long long)l, (unsigned long long)l,
- matched);
- break;
- default:
- file_magerror(ms, "cannot happen: invalid relation `%c'",
- m->reln);
- return -1;
- }
- return matched;
- }
- private int
- handle_annotation(struct magic_set *ms, struct magic *m, int firstline)
- {
- if ((ms->flags & MAGIC_APPLE) && m->apple[0]) {
- if (!firstline && file_printf(ms, "\n- ") == -1)
- return -1;
- if (file_printf(ms, "%.8s", m->apple) == -1)
- return -1;
- return 1;
- }
- if ((ms->flags & MAGIC_EXTENSION) && m->ext[0]) {
- if (!firstline && file_printf(ms, "\n- ") == -1)
- return -1;
- if (file_printf(ms, "%s", m->ext) == -1)
- return -1;
- return 1;
- }
- if ((ms->flags & MAGIC_MIME_TYPE) && m->mimetype[0]) {
- if (!firstline && file_printf(ms, "\n- ") == -1)
- return -1;
- if (file_printf(ms, "%s", m->mimetype) == -1)
- return -1;
- return 1;
- }
- return 0;
- }
- private int
- print_sep(struct magic_set *ms, int firstline)
- {
- // if (ms->flags & MAGIC_NODESC)
- // return 0;
- if (firstline)
- return 0;
- /*
- * we found another match
- * put a newline and '-' to do some simple formatting
- */
- return file_printf(ms, "\n- ");
- }
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