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- /*
- * Copyright (c) Christos Zoulas 2003.
- * All Rights Reserved.
- *
- * 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.
- */
- #include "file.h"
- #ifndef lint
- FILE_RCSID("@(#)$File: funcs.c,v 1.91 2016/12/01 16:16:14 christos Exp $")
- #endif /* lint */
- #include "magic.h"
- #include <assert.h>
- #include <stdarg.h>
- #include <stdlib.h>
- #include <string.h>
- #include <ctype.h>
- #if defined(HAVE_WCHAR_H)
- #include <wchar.h>
- #endif
- #if defined(HAVE_WCTYPE_H)
- #include <wctype.h>
- #endif
- #if defined(HAVE_LIMITS_H)
- #include <limits.h>
- #endif
- #ifndef SIZE_MAX
- #define SIZE_MAX ((size_t)~0)
- #endif
- /*
- * Like printf, only we append to a buffer.
- */
- protected int
- file_vprintf(struct magic_set *ms, const char *fmt, va_list ap)
- {
- int len;
- char *buf, *newstr;
- if (ms->event_flags & EVENT_HAD_ERR)
- return 0;
- len = vasprintf(&buf, fmt, ap);
- if (len < 0)
- goto out;
- if (ms->o.buf != NULL) {
- len = asprintf(&newstr, "%s%s", ms->o.buf, buf);
- free(buf);
- if (len < 0)
- goto out;
- free(ms->o.buf);
- buf = newstr;
- }
- ms->o.buf = buf;
- return 0;
- out:
- fprintf(stderr, "vasprintf failed (%s)", strerror(errno));
- return -1;
- }
- protected int
- file_printf(struct magic_set *ms, const char *fmt, ...)
- {
- int rv;
- va_list ap;
- va_start(ap, fmt);
- rv = file_vprintf(ms, fmt, ap);
- va_end(ap);
- return rv;
- }
- /*
- * error - print best error message possible
- */
- /*VARARGS*/
- __attribute__((__format__(__printf__, 3, 0)))
- private void
- file_error_core(struct magic_set *ms, int error, const char *f, va_list va,
- size_t lineno)
- {
- /* Only the first error is ok */
- if (ms->event_flags & EVENT_HAD_ERR)
- return;
- if (lineno != 0) {
- free(ms->o.buf);
- ms->o.buf = NULL;
- file_printf(ms, "line %" SIZE_T_FORMAT "u:", lineno);
- }
- if (ms->o.buf && *ms->o.buf)
- file_printf(ms, " ");
- file_vprintf(ms, f, va);
- if (error > 0)
- file_printf(ms, " (%s)", strerror(error));
- ms->event_flags |= EVENT_HAD_ERR;
- ms->error = error;
- }
- /*VARARGS*/
- protected void
- file_error(struct magic_set *ms, int error, const char *f, ...)
- {
- va_list va;
- va_start(va, f);
- file_error_core(ms, error, f, va, 0);
- va_end(va);
- }
- /*
- * Print an error with magic line number.
- */
- /*VARARGS*/
- protected void
- file_magerror(struct magic_set *ms, const char *f, ...)
- {
- va_list va;
- va_start(va, f);
- file_error_core(ms, 0, f, va, ms->line);
- va_end(va);
- }
- protected void
- file_oomem(struct magic_set *ms, size_t len)
- {
- file_error(ms, errno, "cannot allocate %" SIZE_T_FORMAT "u bytes",
- len);
- }
- protected void
- file_badseek(struct magic_set *ms)
- {
- file_error(ms, errno, "error seeking");
- }
- protected void
- file_badread(struct magic_set *ms)
- {
- file_error(ms, errno, "error reading");
- }
- #ifndef COMPILE_ONLY
- static int
- checkdone(struct magic_set *ms, int *rv)
- {
- if ((ms->flags & MAGIC_CONTINUE) == 0)
- return 1;
- if (file_printf(ms, "\n- ") == -1)
- *rv = -1;
- return 0;
- }
- /*ARGSUSED*/
- protected int
- file_buffer(struct magic_set *ms, int fd, const char *inname __attribute__ ((__unused__)),
- const void *buf, size_t nb)
- {
- int m = 0, rv = 0, looks_text = 0;
- const unsigned char *ubuf = CAST(const unsigned char *, buf);
- unichar *u8buf = NULL;
- size_t ulen;
- const char *code = NULL;
- const char *code_mime = "binary";
- const char *type = "application/octet-stream";
- const char *def = "data";
- const char *ftype = NULL;
- if (nb == 0) {
- def = "empty";
- type = "application/x-empty";
- goto simple;
- } else if (nb == 1) {
- def = "very short file (no magic)";
- goto simple;
- }
- if ((ms->flags & MAGIC_NO_CHECK_ENCODING) == 0) {
- looks_text = file_encoding(ms, ubuf, nb, &u8buf, &ulen,
- &code, &code_mime, &ftype);
- }
- #ifdef __EMX__
- if ((ms->flags & MAGIC_NO_CHECK_APPTYPE) == 0 && inname) {
- m = file_os2_apptype(ms, inname, buf, nb);
- if ((ms->flags & MAGIC_DEBUG) != 0)
- (void)fprintf(stderr, "[try os2_apptype %d]\n", m);
- switch (m) {
- case -1:
- return -1;
- case 0:
- break;
- default:
- return 1;
- }
- }
- #endif
- #if HAVE_FORK
- /* try compression stuff */
- if ((ms->flags & MAGIC_NO_CHECK_COMPRESS) == 0) {
- m = file_zmagic(ms, fd, inname, ubuf, nb);
- if ((ms->flags & MAGIC_DEBUG) != 0)
- (void)fprintf(stderr, "[try zmagic %d]\n", m);
- if (m) {
- goto done_encoding;
- }
- }
- #endif
- /* Check if we have a tar file */
- if ((ms->flags & MAGIC_NO_CHECK_TAR) == 0) {
- m = file_is_tar(ms, ubuf, nb);
- if ((ms->flags & MAGIC_DEBUG) != 0)
- (void)fprintf(stderr, "[try tar %d]\n", m);
- if (m) {
- if (checkdone(ms, &rv))
- goto done;
- }
- }
- /* Check if we have a CDF file */
- if ((ms->flags & MAGIC_NO_CHECK_CDF) == 0) {
- m = file_trycdf(ms, fd, ubuf, nb);
- if ((ms->flags & MAGIC_DEBUG) != 0)
- (void)fprintf(stderr, "[try cdf %d]\n", m);
- if (m) {
- if (checkdone(ms, &rv))
- goto done;
- }
- }
- /* try soft magic tests */
- if ((ms->flags & MAGIC_NO_CHECK_SOFT) == 0) {
- m = file_softmagic(ms, ubuf, nb, NULL, NULL, BINTEST,
- looks_text);
- if ((ms->flags & MAGIC_DEBUG) != 0)
- (void)fprintf(stderr, "[try softmagic %d]\n", m);
- if (m) {
- #ifdef BUILTIN_ELF
- if ((ms->flags & MAGIC_NO_CHECK_ELF) == 0 && m == 1 &&
- nb > 5 && fd != -1) {
- /*
- * We matched something in the file, so this
- * *might* be an ELF file, and the file is at
- * least 5 bytes long, so if it's an ELF file
- * it has at least one byte past the ELF magic
- * number - try extracting information from the
- * ELF headers that cannot easily * be
- * extracted with rules in the magic file.
- */
- m = file_tryelf(ms, fd, ubuf, nb);
- if ((ms->flags & MAGIC_DEBUG) != 0)
- (void)fprintf(stderr, "[try elf %d]\n",
- m);
- }
- #endif
- if (checkdone(ms, &rv))
- goto done;
- }
- }
- /* try text properties */
- if ((ms->flags & MAGIC_NO_CHECK_TEXT) == 0) {
- m = file_ascmagic(ms, ubuf, nb, looks_text);
- if ((ms->flags & MAGIC_DEBUG) != 0)
- (void)fprintf(stderr, "[try ascmagic %d]\n", m);
- if (m) {
- if (checkdone(ms, &rv))
- goto done;
- }
- }
- simple:
- /* give up */
- m = 1;
- if (ms->flags & MAGIC_MIME) {
- if ((ms->flags & MAGIC_MIME_TYPE) &&
- file_printf(ms, "%s", type) == -1)
- rv = -1;
- } else if (ms->flags & MAGIC_APPLE) {
- if (file_printf(ms, "UNKNUNKN") == -1)
- rv = -1;
- } else if (ms->flags & MAGIC_EXTENSION) {
- if (file_printf(ms, "???") == -1)
- rv = -1;
- } else {
- if (file_printf(ms, "%s", def) == -1)
- rv = -1;
- }
- done:
- if ((ms->flags & MAGIC_MIME_ENCODING) != 0) {
- if (ms->flags & MAGIC_MIME_TYPE)
- if (file_printf(ms, "; charset=") == -1)
- rv = -1;
- if (file_printf(ms, "%s", code_mime) == -1)
- rv = -1;
- }
- #if HAVE_FORK
- done_encoding:
- #endif
- free(u8buf);
- if (rv)
- return rv;
- return m;
- }
- #endif
- protected int
- file_reset(struct magic_set *ms)
- {
- if (ms->mlist[0] == NULL) {
- file_error(ms, 0, "no magic files loaded");
- return -1;
- }
- if (ms->o.buf) {
- free(ms->o.buf);
- ms->o.buf = NULL;
- }
- if (ms->o.pbuf) {
- free(ms->o.pbuf);
- ms->o.pbuf = NULL;
- }
- ms->event_flags &= ~EVENT_HAD_ERR;
- ms->error = -1;
- return 0;
- }
- #define OCTALIFY(n, o) \
- /*LINTED*/ \
- (void)(*(n)++ = '\\', \
- *(n)++ = (((uint32_t)*(o) >> 6) & 3) + '0', \
- *(n)++ = (((uint32_t)*(o) >> 3) & 7) + '0', \
- *(n)++ = (((uint32_t)*(o) >> 0) & 7) + '0', \
- (o)++)
- protected const char *
- file_getbuffer(struct magic_set *ms)
- {
- char *pbuf, *op, *np;
- size_t psize, len;
- if (ms->event_flags & EVENT_HAD_ERR)
- return NULL;
- if (ms->flags & MAGIC_RAW)
- return ms->o.buf;
- if (ms->o.buf == NULL)
- return NULL;
- /* * 4 is for octal representation, + 1 is for NUL */
- len = strlen(ms->o.buf);
- if (len > (SIZE_MAX - 1) / 4) {
- file_oomem(ms, len);
- return NULL;
- }
- psize = len * 4 + 1;
- if ((pbuf = CAST(char *, realloc(ms->o.pbuf, psize))) == NULL) {
- file_oomem(ms, psize);
- return NULL;
- }
- ms->o.pbuf = pbuf;
- #if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH)
- {
- mbstate_t state;
- wchar_t nextchar;
- int mb_conv = 1;
- size_t bytesconsumed;
- char *eop;
- (void)memset(&state, 0, sizeof(mbstate_t));
- np = ms->o.pbuf;
- op = ms->o.buf;
- eop = op + len;
- while (op < eop) {
- bytesconsumed = mbrtowc(&nextchar, op,
- (size_t)(eop - op), &state);
- if (bytesconsumed == (size_t)(-1) ||
- bytesconsumed == (size_t)(-2)) {
- mb_conv = 0;
- break;
- }
- if (iswprint(nextchar)) {
- (void)memcpy(np, op, bytesconsumed);
- op += bytesconsumed;
- np += bytesconsumed;
- } else {
- while (bytesconsumed-- > 0)
- OCTALIFY(np, op);
- }
- }
- *np = '\0';
- /* Parsing succeeded as a multi-byte sequence */
- if (mb_conv != 0)
- return ms->o.pbuf;
- }
- #endif
- for (np = ms->o.pbuf, op = ms->o.buf; *op;) {
- if (isprint((unsigned char)*op)) {
- *np++ = *op++;
- } else {
- OCTALIFY(np, op);
- }
- }
- *np = '\0';
- return ms->o.pbuf;
- }
- protected int
- file_check_mem(struct magic_set *ms, unsigned int level)
- {
- size_t len;
- if (level >= ms->c.len) {
- len = (ms->c.len = 20 + level) * sizeof(*ms->c.li);
- ms->c.li = CAST(struct level_info *, (ms->c.li == NULL) ?
- malloc(len) :
- realloc(ms->c.li, len));
- if (ms->c.li == NULL) {
- file_oomem(ms, len);
- return -1;
- }
- }
- ms->c.li[level].got_match = 0;
- #ifdef ENABLE_CONDITIONALS
- ms->c.li[level].last_match = 0;
- ms->c.li[level].last_cond = COND_NONE;
- #endif /* ENABLE_CONDITIONALS */
- return 0;
- }
- protected size_t
- file_printedlen(const struct magic_set *ms)
- {
- return ms->o.buf == NULL ? 0 : strlen(ms->o.buf);
- }
- protected int
- file_replace(struct magic_set *ms, const char *pat, const char *rep)
- {
- file_regex_t rx;
- int rc, rv = -1;
- rc = file_regcomp(&rx, pat, REG_EXTENDED);
- if (rc) {
- file_regerror(&rx, rc, ms);
- } else {
- regmatch_t rm;
- int nm = 0;
- while (file_regexec(&rx, ms->o.buf, 1, &rm, 0) == 0) {
- ms->o.buf[rm.rm_so] = '\0';
- if (file_printf(ms, "%s%s", rep,
- rm.rm_eo != 0 ? ms->o.buf + rm.rm_eo : "") == -1)
- goto out;
- nm++;
- }
- rv = nm;
- }
- out:
- file_regfree(&rx);
- return rv;
- }
- protected int
- file_regcomp(file_regex_t *rx, const char *pat, int flags)
- {
- #ifdef USE_C_LOCALE
- rx->c_lc_ctype = newlocale(LC_CTYPE_MASK, "C", 0);
- assert(rx->c_lc_ctype != NULL);
- rx->old_lc_ctype = uselocale(rx->c_lc_ctype);
- assert(rx->old_lc_ctype != NULL);
- #else
- rx->old_lc_ctype = setlocale(LC_CTYPE, "C");
- #endif
- rx->pat = pat;
- return rx->rc = regcomp(&rx->rx, pat, flags);
- }
- protected int
- file_regexec(file_regex_t *rx, const char *str, size_t nmatch,
- regmatch_t* pmatch, int eflags)
- {
- assert(rx->rc == 0);
- return regexec(&rx->rx, str, nmatch, pmatch, eflags);
- }
- protected void
- file_regfree(file_regex_t *rx)
- {
- if (rx->rc == 0)
- regfree(&rx->rx);
- #ifdef USE_C_LOCALE
- (void)uselocale(rx->old_lc_ctype);
- freelocale(rx->c_lc_ctype);
- #else
- (void)setlocale(LC_CTYPE, rx->old_lc_ctype);
- #endif
- }
- protected void
- file_regerror(file_regex_t *rx, int rc, struct magic_set *ms)
- {
- char errmsg[512];
- (void)regerror(rc, &rx->rx, errmsg, sizeof(errmsg));
- file_magerror(ms, "regex error %d for `%s', (%s)", rc, rx->pat,
- errmsg);
- }
- protected file_pushbuf_t *
- file_push_buffer(struct magic_set *ms)
- {
- file_pushbuf_t *pb;
- if (ms->event_flags & EVENT_HAD_ERR)
- return NULL;
- if ((pb = (CAST(file_pushbuf_t *, malloc(sizeof(*pb))))) == NULL)
- return NULL;
- pb->buf = ms->o.buf;
- pb->offset = ms->offset;
- ms->o.buf = NULL;
- ms->offset = 0;
- return pb;
- }
- protected char *
- file_pop_buffer(struct magic_set *ms, file_pushbuf_t *pb)
- {
- char *rbuf;
- if (ms->event_flags & EVENT_HAD_ERR) {
- free(pb->buf);
- free(pb);
- return NULL;
- }
- rbuf = ms->o.buf;
- ms->o.buf = pb->buf;
- ms->offset = pb->offset;
- free(pb);
- return rbuf;
- }
- /*
- * convert string to ascii printable format.
- */
- protected char *
- file_printable(char *buf, size_t bufsiz, const char *str)
- {
- char *ptr, *eptr;
- const unsigned char *s = (const unsigned char *)str;
- for (ptr = buf, eptr = ptr + bufsiz - 1; ptr < eptr && *s; s++) {
- if (isprint(*s)) {
- *ptr++ = *s;
- continue;
- }
- if (ptr >= eptr - 3)
- break;
- *ptr++ = '\\';
- *ptr++ = ((CAST(unsigned int, *s) >> 6) & 7) + '0';
- *ptr++ = ((CAST(unsigned int, *s) >> 3) & 7) + '0';
- *ptr++ = ((CAST(unsigned int, *s) >> 0) & 7) + '0';
- }
- *ptr = '\0';
- return buf;
- }
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