Annotation of src/usr.bin/file/funcs.c, Revision 1.5
1.5 ! chl 1: /* $OpenBSD: funcs.c,v 1.4 2007/07/09 16:39:48 dim Exp $ */
1.1 tedu 2: /*
3: * Copyright (c) Christos Zoulas 2003.
4: * All Rights Reserved.
5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: * 1. Redistributions of source code must retain the above copyright
10: * notice immediately at the beginning of the file, without modification,
11: * this list of conditions, and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: *
16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
20: * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26: * SUCH DAMAGE.
27: */
28: #include "file.h"
29: #include "magic.h"
30: #include <stdarg.h>
31: #include <stdlib.h>
32: #include <string.h>
33: #include <ctype.h>
1.5 ! chl 34: #if defined(HAVE_WCHAR_H)
! 35: #include <wchar.h>
! 36: #endif
! 37: #if defined(HAVE_WCTYPE_H)
! 38: #include <wctype.h>
! 39: #endif
! 40: #if defined(HAVE_LIMITS_H)
! 41: #include <limits.h>
! 42: #endif
! 43: #ifndef SIZE_T_MAX
! 44: #ifdef __LP64__
! 45: #define SIZE_T_MAX (size_t)0xfffffffffffffffffU
! 46: #else
! 47: #define SIZE_T_MAX (size_t)0xffffffffU
! 48: #endif
! 49: #endif
1.1 tedu 50:
51: #ifndef lint
1.5 ! chl 52: FILE_RCSID("@(#)$Id: funcs.c,v 1.4 2007/07/09 16:39:48 dim Exp $")
1.1 tedu 53: #endif /* lint */
1.5 ! chl 54:
! 55: #ifndef HAVE_VSNPRINTF
! 56: int vsnprintf(char *, size_t, const char *, va_list);
! 57: #endif
! 58:
1.1 tedu 59: /*
60: * Like printf, only we print to a buffer and advance it.
61: */
62: protected int
63: file_printf(struct magic_set *ms, const char *fmt, ...)
64: {
65: va_list ap;
1.5 ! chl 66: size_t len, size;
1.1 tedu 67: char *buf;
68:
69: va_start(ap, fmt);
70:
1.4 dim 71: len = vsnprintf(ms->o.ptr, ms->o.left, fmt, ap);
72: if (len == -1) {
73: file_error(ms, errno, "vsnprintf failed");
74: return -1;
75: } else if (len >= ms->o.left) {
1.5 ! chl 76: long diff; /* XXX: really ptrdiff_t */
! 77:
1.1 tedu 78: va_end(ap);
1.4 dim 79: size = (ms->o.size - ms->o.left) + len + 1024;
80: if ((buf = realloc(ms->o.buf, size)) == NULL) {
1.5 ! chl 81: file_oomem(ms, size);
1.1 tedu 82: return -1;
83: }
1.4 dim 84: diff = ms->o.ptr - ms->o.buf;
85: ms->o.ptr = buf + diff;
1.1 tedu 86: ms->o.buf = buf;
1.4 dim 87: ms->o.left = size - diff;
88: ms->o.size = size;
1.1 tedu 89:
90: va_start(ap, fmt);
1.4 dim 91: len = vsnprintf(ms->o.ptr, ms->o.left, fmt, ap);
92: if (len == -1) {
93: file_error(ms, errno, "vsnprintf failed");
94: return -1;
95: }
1.1 tedu 96: }
1.5 ! chl 97: va_end(ap);
1.1 tedu 98: ms->o.ptr += len;
1.4 dim 99: ms->o.left -= len;
1.1 tedu 100: return 0;
101: }
102:
103: /*
104: * error - print best error message possible
105: */
106: /*VARARGS*/
1.5 ! chl 107: private void
! 108: file_error_core(struct magic_set *ms, int error, const char *f, va_list va,
! 109: uint32_t lineno)
1.1 tedu 110: {
1.5 ! chl 111: size_t len;
1.1 tedu 112: /* Only the first error is ok */
113: if (ms->haderr)
114: return;
1.5 ! chl 115: len = 0;
! 116: if (lineno != 0) {
! 117: (void)snprintf(ms->o.buf, ms->o.size, "line %u: ", lineno);
! 118: len = strlen(ms->o.buf);
! 119: }
! 120: (void)vsnprintf(ms->o.buf + len, ms->o.size - len, f, va);
1.1 tedu 121: if (error > 0) {
1.5 ! chl 122: len = strlen(ms->o.buf);
1.1 tedu 123: (void)snprintf(ms->o.buf + len, ms->o.size - len, " (%s)",
124: strerror(error));
125: }
126: ms->haderr++;
127: ms->error = error;
128: }
129:
1.5 ! chl 130: /*VARARGS*/
! 131: protected void
! 132: file_error(struct magic_set *ms, int error, const char *f, ...)
! 133: {
! 134: va_list va;
! 135: va_start(va, f);
! 136: file_error_core(ms, error, f, va, 0);
! 137: va_end(va);
! 138: }
! 139:
! 140: /*
! 141: * Print an error with magic line number.
! 142: */
! 143: /*VARARGS*/
! 144: protected void
! 145: file_magerror(struct magic_set *ms, const char *f, ...)
! 146: {
! 147: va_list va;
! 148: va_start(va, f);
! 149: file_error_core(ms, 0, f, va, ms->line);
! 150: va_end(va);
! 151: }
1.1 tedu 152:
153: protected void
1.5 ! chl 154: file_oomem(struct magic_set *ms, size_t len)
1.1 tedu 155: {
1.5 ! chl 156: file_error(ms, errno, "cannot allocate %zu bytes", len);
1.1 tedu 157: }
158:
159: protected void
160: file_badseek(struct magic_set *ms)
161: {
162: file_error(ms, errno, "error seeking");
163: }
164:
165: protected void
166: file_badread(struct magic_set *ms)
167: {
168: file_error(ms, errno, "error reading");
169: }
170:
1.5 ! chl 171: #ifndef COMPILE_ONLY
1.1 tedu 172: protected int
1.5 ! chl 173: file_buffer(struct magic_set *ms, int fd, const char *inname, const void *buf,
! 174: size_t nb)
1.1 tedu 175: {
176: int m;
1.5 ! chl 177:
! 178: #ifdef __EMX__
! 179: if ((ms->flags & MAGIC_NO_CHECK_APPTYPE) == 0 && inname) {
! 180: switch (file_os2_apptype(ms, inname, buf, nb)) {
! 181: case -1:
! 182: return -1;
! 183: case 0:
! 184: break;
! 185: default:
! 186: return 1;
! 187: }
! 188: }
! 189: #endif
! 190:
1.1 tedu 191: /* try compression stuff */
1.5 ! chl 192: if ((ms->flags & MAGIC_NO_CHECK_COMPRESS) != 0 ||
! 193: (m = file_zmagic(ms, fd, inname, buf, nb)) == 0) {
1.1 tedu 194: /* Check if we have a tar file */
1.5 ! chl 195: if ((ms->flags & MAGIC_NO_CHECK_TAR) != 0 ||
! 196: (m = file_is_tar(ms, buf, nb)) == 0) {
1.1 tedu 197: /* try tests in /etc/magic (or surrogate magic file) */
1.5 ! chl 198: if ((ms->flags & MAGIC_NO_CHECK_SOFT) != 0 ||
! 199: (m = file_softmagic(ms, buf, nb)) == 0) {
1.1 tedu 200: /* try known keywords, check whether it is ASCII */
1.5 ! chl 201: if ((ms->flags & MAGIC_NO_CHECK_ASCII) != 0 ||
! 202: (m = file_ascmagic(ms, buf, nb)) == 0) {
1.1 tedu 203: /* abandon hope, all ye who remain here */
204: if (file_printf(ms, ms->flags & MAGIC_MIME ?
1.5 ! chl 205: (nb ? "application/octet-stream" :
! 206: "application/empty") :
! 207: (nb ? "data" :
! 208: "empty")) == -1)
1.1 tedu 209: return -1;
210: m = 1;
211: }
212: }
213: }
214: }
1.5 ! chl 215: #ifdef BUILTIN_ELF
! 216: if ((ms->flags & MAGIC_NO_CHECK_ELF) == 0 && m == 1 && nb > 5 && fd != -1) {
! 217: /*
! 218: * We matched something in the file, so this *might*
! 219: * be an ELF file, and the file is at least 5 bytes
! 220: * long, so if it's an ELF file it has at least one
! 221: * byte past the ELF magic number - try extracting
! 222: * information from the ELF headers that cannot easily
! 223: * be extracted with rules in the magic file.
! 224: */
! 225: (void)file_tryelf(ms, fd, buf, nb);
! 226: }
! 227: #endif
1.1 tedu 228: return m;
229: }
1.5 ! chl 230: #endif
1.1 tedu 231:
232: protected int
233: file_reset(struct magic_set *ms)
234: {
235: if (ms->mlist == NULL) {
236: file_error(ms, 0, "no magic files loaded");
237: return -1;
238: }
239: ms->o.ptr = ms->o.buf;
1.5 ! chl 240: ms->o.left = ms->o.size;
1.1 tedu 241: ms->haderr = 0;
242: ms->error = -1;
243: return 0;
244: }
245:
1.5 ! chl 246: #define OCTALIFY(n, o) \
! 247: /*LINTED*/ \
! 248: (void)(*(n)++ = '\\', \
! 249: *(n)++ = (((uint32_t)*(o) >> 6) & 3) + '0', \
! 250: *(n)++ = (((uint32_t)*(o) >> 3) & 7) + '0', \
! 251: *(n)++ = (((uint32_t)*(o) >> 0) & 7) + '0', \
! 252: (o)++)
! 253:
1.1 tedu 254: protected const char *
255: file_getbuffer(struct magic_set *ms)
256: {
1.4 dim 257: char *pbuf, *op, *np;
258: size_t psize, len;
1.1 tedu 259:
260: if (ms->haderr)
261: return NULL;
262:
263: if (ms->flags & MAGIC_RAW)
264: return ms->o.buf;
265:
1.4 dim 266: len = ms->o.size - ms->o.left;
1.5 ! chl 267: /* * 4 is for octal representation, + 1 is for NUL */
1.4 dim 268: if (len > (SIZE_T_MAX - 1) / 4) {
1.5 ! chl 269: file_oomem(ms, len);
1.4 dim 270: return NULL;
271: }
272: psize = len * 4 + 1;
273: if (ms->o.psize < psize) {
274: if ((pbuf = realloc(ms->o.pbuf, psize)) == NULL) {
1.5 ! chl 275: file_oomem(ms, psize);
1.1 tedu 276: return NULL;
277: }
1.4 dim 278: ms->o.psize = psize;
279: ms->o.pbuf = pbuf;
1.1 tedu 280: }
281:
1.5 ! chl 282: #if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH)
! 283: {
! 284: mbstate_t state;
! 285: wchar_t nextchar;
! 286: int mb_conv = 1;
! 287: size_t bytesconsumed;
! 288: char *eop;
! 289: (void)memset(&state, 0, sizeof(mbstate_t));
! 290:
! 291: np = ms->o.pbuf;
! 292: op = ms->o.buf;
! 293: eop = op + strlen(ms->o.buf);
! 294:
! 295: while (op < eop) {
! 296: bytesconsumed = mbrtowc(&nextchar, op,
! 297: (size_t)(eop - op), &state);
! 298: if (bytesconsumed == (size_t)(-1) ||
! 299: bytesconsumed == (size_t)(-2)) {
! 300: mb_conv = 0;
! 301: break;
! 302: }
! 303:
! 304: if (iswprint(nextchar)) {
! 305: (void)memcpy(np, op, bytesconsumed);
! 306: op += bytesconsumed;
! 307: np += bytesconsumed;
! 308: } else {
! 309: while (bytesconsumed-- > 0)
! 310: OCTALIFY(np, op);
! 311: }
! 312: }
! 313: *np = '\0';
! 314:
! 315: /* Parsing succeeded as a multi-byte sequence */
! 316: if (mb_conv != 0)
! 317: return ms->o.pbuf;
! 318: }
! 319: #endif
! 320:
1.1 tedu 321: for (np = ms->o.pbuf, op = ms->o.buf; *op; op++) {
322: if (isprint((unsigned char)*op)) {
323: *np++ = *op;
324: } else {
1.5 ! chl 325: OCTALIFY(np, op);
1.1 tedu 326: }
327: }
328: *np = '\0';
329: return ms->o.pbuf;
330: }
1.5 ! chl 331:
! 332: protected int
! 333: file_check_mem(struct magic_set *ms, unsigned int level)
! 334: {
! 335: size_t len;
! 336:
! 337: if (level >= ms->c.len) {
! 338: len = (ms->c.len += 20) * sizeof(*ms->c.li);
! 339: ms->c.li = (ms->c.li == NULL) ? malloc(len) :
! 340: realloc(ms->c.li, len);
! 341: if (ms->c.li == NULL) {
! 342: file_oomem(ms, len);
! 343: return -1;
! 344: }
! 345: }
! 346: ms->c.li[level].got_match = 0;
! 347: #ifdef ENABLE_CONDITIONALS
! 348: ms->c.li[level].last_match = 0;
! 349: ms->c.li[level].last_cond = COND_NONE;
! 350: #endif /* ENABLE_CONDITIONALS */
! 351: return 0;
! 352: }
! 353: /*
! 354: * Yes these wrappers suffer from buffer overflows, but if your OS does not
! 355: * have the real functions, maybe you should consider replacing your OS?
! 356: */
! 357: #ifndef HAVE_VSNPRINTF
! 358: int
! 359: vsnprintf(char *buf, size_t len, const char *fmt, va_list ap)
! 360: {
! 361: return vsprintf(buf, fmt, ap);
! 362: }
! 363: #endif
! 364:
! 365: #ifndef HAVE_SNPRINTF
! 366: /*ARGSUSED*/
! 367: int
! 368: snprintf(char *buf, size_t len, const char *fmt, ...)
! 369: {
! 370: int rv;
! 371: va_list ap;
! 372: va_start(ap, fmt);
! 373: rv = vsprintf(buf, fmt, ap);
! 374: va_end(ap);
! 375: return rv;
! 376: }
! 377: #endif
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