magic.c revision 284237
1133359Sobrien/* 2133359Sobrien * Copyright (c) Christos Zoulas 2003. 3133359Sobrien * All Rights Reserved. 4186690Sobrien * 5133359Sobrien * Redistribution and use in source and binary forms, with or without 6133359Sobrien * modification, are permitted provided that the following conditions 7133359Sobrien * are met: 8133359Sobrien * 1. Redistributions of source code must retain the above copyright 9133359Sobrien * notice immediately at the beginning of the file, without modification, 10133359Sobrien * this list of conditions, and the following disclaimer. 11133359Sobrien * 2. Redistributions in binary form must reproduce the above copyright 12133359Sobrien * notice, this list of conditions and the following disclaimer in the 13133359Sobrien * documentation and/or other materials provided with the distribution. 14186690Sobrien * 15133359Sobrien * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16133359Sobrien * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17133359Sobrien * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18133359Sobrien * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 19133359Sobrien * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20133359Sobrien * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21133359Sobrien * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22133359Sobrien * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23133359Sobrien * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24133359Sobrien * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25133359Sobrien * SUCH DAMAGE. 26133359Sobrien */ 27133359Sobrien 28226048Sobrien#ifdef WIN32 29226048Sobrien#include <windows.h> 30226048Sobrien#include <shlwapi.h> 31226048Sobrien#endif 32226048Sobrien 33133359Sobrien#include "file.h" 34191736Sobrien 35191736Sobrien#ifndef lint 36284237SdelphijFILE_RCSID("@(#)$File: magic.c,v 1.93 2015/04/15 23:47:58 christos Exp $") 37191736Sobrien#endif /* lint */ 38191736Sobrien 39133359Sobrien#include "magic.h" 40133359Sobrien 41133359Sobrien#include <stdlib.h> 42133359Sobrien#include <unistd.h> 43133359Sobrien#include <string.h> 44133359Sobrien#ifdef QUICK 45133359Sobrien#include <sys/mman.h> 46133359Sobrien#endif 47186690Sobrien#ifdef HAVE_LIMITS_H 48169942Sobrien#include <limits.h> /* for PIPE_BUF */ 49186690Sobrien#endif 50133359Sobrien 51133359Sobrien#if defined(HAVE_UTIMES) 52133359Sobrien# include <sys/time.h> 53133359Sobrien#elif defined(HAVE_UTIME) 54133359Sobrien# if defined(HAVE_SYS_UTIME_H) 55133359Sobrien# include <sys/utime.h> 56133359Sobrien# elif defined(HAVE_UTIME_H) 57133359Sobrien# include <utime.h> 58133359Sobrien# endif 59133359Sobrien#endif 60133359Sobrien 61133359Sobrien#ifdef HAVE_UNISTD_H 62133359Sobrien#include <unistd.h> /* for read() */ 63133359Sobrien#endif 64133359Sobrien 65186690Sobrien#ifndef PIPE_BUF 66186690Sobrien/* Get the PIPE_BUF from pathconf */ 67186690Sobrien#ifdef _PC_PIPE_BUF 68186690Sobrien#define PIPE_BUF pathconf(".", _PC_PIPE_BUF) 69186690Sobrien#else 70186690Sobrien#define PIPE_BUF 512 71186690Sobrien#endif 72186690Sobrien#endif 73186690Sobrien 74133359Sobrienprivate void close_and_restore(const struct magic_set *, const char *, int, 75133359Sobrien const struct stat *); 76186690Sobrienprivate int unreadable_info(struct magic_set *, mode_t, const char *); 77226048Sobrienprivate const char* get_default_magic(void); 78175296Sobrien#ifndef COMPILE_ONLY 79175296Sobrienprivate const char *file_or_fd(struct magic_set *, const char *, int); 80175296Sobrien#endif 81133359Sobrien 82159764Sobrien#ifndef STDIN_FILENO 83159764Sobrien#define STDIN_FILENO 0 84159764Sobrien#endif 85159764Sobrien 86284237Sdelphij#ifdef WIN32 87284237Sdelphij/* HINSTANCE of this shared library. Needed for get_default_magic() */ 88284237Sdelphijstatic HINSTANCE _w32_dll_instance = NULL; 89284237Sdelphij 90284237Sdelphijstatic void 91284237Sdelphij_w32_append_path(char **hmagicpath, const char *fmt, ...) 92284237Sdelphij{ 93284237Sdelphij char *tmppath; 94284237Sdelphij char *newpath; 95284237Sdelphij va_list ap; 96284237Sdelphij 97284237Sdelphij va_start(ap, fmt); 98284237Sdelphij if (vasprintf(&tmppath, fmt, ap) < 0) { 99284237Sdelphij va_end(ap); 100284237Sdelphij return; 101284237Sdelphij } 102284237Sdelphij va_end(ap); 103284237Sdelphij 104284237Sdelphij if (access(tmppath, R_OK) == -1) 105284237Sdelphij goto out; 106284237Sdelphij 107284237Sdelphij if (*hmagicpath == NULL) { 108284237Sdelphij *hmagicpath = tmppath; 109284237Sdelphij return; 110284237Sdelphij } 111284237Sdelphij 112284237Sdelphij if (asprintf(&newpath, "%s%c%s", *hmagicpath, PATHSEP, tmppath) < 0) 113284237Sdelphij goto out; 114284237Sdelphij 115284237Sdelphij free(*hmagicpath); 116284237Sdelphij free(tmppath); 117284237Sdelphij *hmagicpath = newpath; 118284237Sdelphij return; 119284237Sdelphijout: 120284237Sdelphij free(tmppath); 121284237Sdelphij} 122284237Sdelphij 123284237Sdelphijstatic void 124284237Sdelphij_w32_get_magic_relative_to(char **hmagicpath, HINSTANCE module) 125284237Sdelphij{ 126284237Sdelphij static const char *trypaths[] = { 127284237Sdelphij "%s/share/misc/magic.mgc", 128284237Sdelphij "%s/magic.mgc", 129284237Sdelphij }; 130284237Sdelphij LPSTR dllpath; 131284237Sdelphij size_t sp; 132284237Sdelphij 133284237Sdelphij dllpath = calloc(MAX_PATH + 1, sizeof(*dllpath)); 134284237Sdelphij 135284237Sdelphij if (!GetModuleFileNameA(module, dllpath, MAX_PATH)) 136284237Sdelphij goto out; 137284237Sdelphij 138284237Sdelphij PathRemoveFileSpecA(dllpath); 139284237Sdelphij 140284237Sdelphij sp = strlen(dllpath); 141284237Sdelphij if (sp > 3 && stricmp(&dllpath[sp - 3], "bin") == 0) { 142284237Sdelphij _w32_append_path(hmagicpath, 143284237Sdelphij "%s/../share/misc/magic.mgc", dllpath); 144284237Sdelphij goto out; 145284237Sdelphij } 146284237Sdelphij 147284237Sdelphij for (sp = 0; sp < __arraycount(trypaths); sp++) 148284237Sdelphij _w32_append_path(hmagicpath, trypaths[sp], dllpath); 149284237Sdelphijout: 150284237Sdelphij free(dllpath); 151284237Sdelphij} 152284237Sdelphij 153284237Sdelphij/* Placate GCC by offering a sacrificial previous prototype */ 154284237SdelphijBOOL WINAPI DllMain(HINSTANCE, DWORD, LPVOID); 155284237Sdelphij 156284237SdelphijBOOL WINAPI 157284237SdelphijDllMain(HINSTANCE hinstDLL, DWORD fdwReason, 158284237Sdelphij LPVOID lpvReserved __attribute__((__unused__))) 159284237Sdelphij{ 160284237Sdelphij if (fdwReason == DLL_PROCESS_ATTACH) 161284237Sdelphij _w32_dll_instance = hinstDLL; 162284237Sdelphij return TRUE; 163284237Sdelphij} 164284237Sdelphij#endif 165284237Sdelphij 166226048Sobrienprivate const char * 167226048Sobrienget_default_magic(void) 168226048Sobrien{ 169226048Sobrien static const char hmagic[] = "/.magic/magic.mgc"; 170226048Sobrien static char *default_magic; 171226048Sobrien char *home, *hmagicpath; 172226048Sobrien 173226048Sobrien#ifndef WIN32 174226048Sobrien struct stat st; 175226048Sobrien 176226048Sobrien if (default_magic) { 177226048Sobrien free(default_magic); 178226048Sobrien default_magic = NULL; 179226048Sobrien } 180226048Sobrien if ((home = getenv("HOME")) == NULL) 181226048Sobrien return MAGIC; 182226048Sobrien 183267843Sdelphij if (asprintf(&hmagicpath, "%s/.magic.mgc", home) < 0) 184226048Sobrien return MAGIC; 185267843Sdelphij if (stat(hmagicpath, &st) == -1) { 186226048Sobrien free(hmagicpath); 187267843Sdelphij if (asprintf(&hmagicpath, "%s/.magic", home) < 0) 188226048Sobrien return MAGIC; 189267843Sdelphij if (stat(hmagicpath, &st) == -1) 190226048Sobrien goto out; 191267843Sdelphij if (S_ISDIR(st.st_mode)) { 192267843Sdelphij free(hmagicpath); 193267843Sdelphij if (asprintf(&hmagicpath, "%s/%s", home, hmagic) < 0) 194267843Sdelphij return MAGIC; 195267843Sdelphij if (access(hmagicpath, R_OK) == -1) 196267843Sdelphij goto out; 197267843Sdelphij } 198226048Sobrien } 199226048Sobrien 200226048Sobrien if (asprintf(&default_magic, "%s:%s", hmagicpath, MAGIC) < 0) 201226048Sobrien goto out; 202226048Sobrien free(hmagicpath); 203226048Sobrien return default_magic; 204226048Sobrienout: 205226048Sobrien default_magic = NULL; 206226048Sobrien free(hmagicpath); 207226048Sobrien return MAGIC; 208226048Sobrien#else 209267843Sdelphij hmagicpath = NULL; 210226048Sobrien 211226048Sobrien if (default_magic) { 212226048Sobrien free(default_magic); 213226048Sobrien default_magic = NULL; 214226048Sobrien } 215226048Sobrien 216284237Sdelphij /* First, try to get a magic file from user-application data */ 217284237Sdelphij if ((home = getenv("LOCALAPPDATA")) != NULL) 218284237Sdelphij _w32_append_path(&hmagicpath, "%s%s", home, hmagic); 219226048Sobrien 220284237Sdelphij /* Second, try to get a magic file from the user profile data */ 221284237Sdelphij if ((home = getenv("USERPROFILE")) != NULL) 222284237Sdelphij _w32_append_path(&hmagicpath, 223284237Sdelphij "%s/Local Settings/Application Data%s", home, hmagic); 224226048Sobrien 225284237Sdelphij /* Third, try to get a magic file from Common Files */ 226284237Sdelphij if ((home = getenv("COMMONPROGRAMFILES")) != NULL) 227284237Sdelphij _w32_append_path(&hmagicpath, "%s%s", home, hmagic); 228226048Sobrien 229284237Sdelphij /* Fourth, try to get magic file relative to exe location */ 230284237Sdelphij _w32_get_magic_relative_to(&hmagicpath, NULL); 231226048Sobrien 232284237Sdelphij /* Fifth, try to get magic file relative to dll location */ 233284237Sdelphij _w32_get_magic_relative_to(&hmagicpath, _w32_dll_instance); 234284237Sdelphij 235284237Sdelphij /* Avoid MAGIC constant - it likely points to a file within MSys tree */ 236226048Sobrien default_magic = hmagicpath; 237226048Sobrien return default_magic; 238226048Sobrien#endif 239226048Sobrien} 240226048Sobrien 241226048Sobrienpublic const char * 242226048Sobrienmagic_getpath(const char *magicfile, int action) 243226048Sobrien{ 244226048Sobrien if (magicfile != NULL) 245226048Sobrien return magicfile; 246226048Sobrien 247226048Sobrien magicfile = getenv("MAGIC"); 248226048Sobrien if (magicfile != NULL) 249226048Sobrien return magicfile; 250226048Sobrien 251226048Sobrien return action == FILE_LOAD ? get_default_magic() : MAGIC; 252226048Sobrien} 253226048Sobrien 254133359Sobrienpublic struct magic_set * 255133359Sobrienmagic_open(int flags) 256133359Sobrien{ 257267843Sdelphij return file_ms_alloc(flags); 258133359Sobrien} 259133359Sobrien 260169942Sobrienprivate int 261186690Sobrienunreadable_info(struct magic_set *ms, mode_t md, const char *file) 262169942Sobrien{ 263267843Sdelphij if (file) { 264267843Sdelphij /* We cannot open it, but we were able to stat it. */ 265267843Sdelphij if (access(file, W_OK) == 0) 266267843Sdelphij if (file_printf(ms, "writable, ") == -1) 267267843Sdelphij return -1; 268267843Sdelphij if (access(file, X_OK) == 0) 269267843Sdelphij if (file_printf(ms, "executable, ") == -1) 270267843Sdelphij return -1; 271267843Sdelphij } 272169942Sobrien if (S_ISREG(md)) 273169942Sobrien if (file_printf(ms, "regular file, ") == -1) 274169942Sobrien return -1; 275169942Sobrien if (file_printf(ms, "no read permission") == -1) 276169942Sobrien return -1; 277169942Sobrien return 0; 278169942Sobrien} 279169942Sobrien 280133359Sobrienpublic void 281169942Sobrienmagic_close(struct magic_set *ms) 282133359Sobrien{ 283267843Sdelphij if (ms == NULL) 284267843Sdelphij return; 285267843Sdelphij file_ms_free(ms); 286133359Sobrien} 287133359Sobrien 288133359Sobrien/* 289133359Sobrien * load a magic file 290133359Sobrien */ 291133359Sobrienpublic int 292133359Sobrienmagic_load(struct magic_set *ms, const char *magicfile) 293133359Sobrien{ 294267843Sdelphij if (ms == NULL) 295267843Sdelphij return -1; 296267843Sdelphij return file_apprentice(ms, magicfile, FILE_LOAD); 297133359Sobrien} 298133359Sobrien 299275698Sdelphij#ifndef COMPILE_ONLY 300275698Sdelphij/* 301275698Sdelphij * Install a set of compiled magic buffers. 302275698Sdelphij */ 303133359Sobrienpublic int 304275698Sdelphijmagic_load_buffers(struct magic_set *ms, void **bufs, size_t *sizes, 305275698Sdelphij size_t nbufs) 306275698Sdelphij{ 307275698Sdelphij if (ms == NULL) 308275698Sdelphij return -1; 309275698Sdelphij return buffer_apprentice(ms, (struct magic **)bufs, sizes, nbufs); 310275698Sdelphij} 311275698Sdelphij#endif 312275698Sdelphij 313275698Sdelphijpublic int 314133359Sobrienmagic_compile(struct magic_set *ms, const char *magicfile) 315133359Sobrien{ 316267843Sdelphij if (ms == NULL) 317267843Sdelphij return -1; 318267843Sdelphij return file_apprentice(ms, magicfile, FILE_COMPILE); 319133359Sobrien} 320133359Sobrien 321133359Sobrienpublic int 322133359Sobrienmagic_check(struct magic_set *ms, const char *magicfile) 323133359Sobrien{ 324267843Sdelphij if (ms == NULL) 325267843Sdelphij return -1; 326267843Sdelphij return file_apprentice(ms, magicfile, FILE_CHECK); 327133359Sobrien} 328133359Sobrien 329226048Sobrienpublic int 330226048Sobrienmagic_list(struct magic_set *ms, const char *magicfile) 331226048Sobrien{ 332267843Sdelphij if (ms == NULL) 333267843Sdelphij return -1; 334267843Sdelphij return file_apprentice(ms, magicfile, FILE_LIST); 335226048Sobrien} 336226048Sobrien 337133359Sobrienprivate void 338133359Sobrienclose_and_restore(const struct magic_set *ms, const char *name, int fd, 339133359Sobrien const struct stat *sb) 340133359Sobrien{ 341267843Sdelphij if (fd == STDIN_FILENO || name == NULL) 342159764Sobrien return; 343133359Sobrien (void) close(fd); 344159764Sobrien 345159764Sobrien if ((ms->flags & MAGIC_PRESERVE_ATIME) != 0) { 346133359Sobrien /* 347133359Sobrien * Try to restore access, modification times if read it. 348133359Sobrien * This is really *bad* because it will modify the status 349133359Sobrien * time of the file... And of course this will affect 350133359Sobrien * backup programs 351133359Sobrien */ 352133359Sobrien#ifdef HAVE_UTIMES 353133359Sobrien struct timeval utsbuf[2]; 354186690Sobrien (void)memset(utsbuf, 0, sizeof(utsbuf)); 355133359Sobrien utsbuf[0].tv_sec = sb->st_atime; 356133359Sobrien utsbuf[1].tv_sec = sb->st_mtime; 357133359Sobrien 358133359Sobrien (void) utimes(name, utsbuf); /* don't care if loses */ 359133359Sobrien#elif defined(HAVE_UTIME_H) || defined(HAVE_SYS_UTIME_H) 360133359Sobrien struct utimbuf utbuf; 361133359Sobrien 362191736Sobrien (void)memset(&utbuf, 0, sizeof(utbuf)); 363133359Sobrien utbuf.actime = sb->st_atime; 364133359Sobrien utbuf.modtime = sb->st_mtime; 365133359Sobrien (void) utime(name, &utbuf); /* don't care if loses */ 366133359Sobrien#endif 367133359Sobrien } 368133359Sobrien} 369133359Sobrien 370133359Sobrien#ifndef COMPILE_ONLY 371175296Sobrien 372133359Sobrien/* 373175296Sobrien * find type of descriptor 374175296Sobrien */ 375175296Sobrienpublic const char * 376175296Sobrienmagic_descriptor(struct magic_set *ms, int fd) 377175296Sobrien{ 378267843Sdelphij if (ms == NULL) 379267843Sdelphij return NULL; 380175296Sobrien return file_or_fd(ms, NULL, fd); 381175296Sobrien} 382175296Sobrien 383175296Sobrien/* 384133359Sobrien * find type of named file 385133359Sobrien */ 386133359Sobrienpublic const char * 387133359Sobrienmagic_file(struct magic_set *ms, const char *inname) 388133359Sobrien{ 389267843Sdelphij if (ms == NULL) 390267843Sdelphij return NULL; 391175296Sobrien return file_or_fd(ms, inname, STDIN_FILENO); 392175296Sobrien} 393175296Sobrien 394175296Sobrienprivate const char * 395175296Sobrienfile_or_fd(struct magic_set *ms, const char *inname, int fd) 396175296Sobrien{ 397159764Sobrien int rv = -1; 398159764Sobrien unsigned char *buf; 399133359Sobrien struct stat sb; 400133359Sobrien ssize_t nbytes = 0; /* number of bytes read from a datafile */ 401169942Sobrien int ispipe = 0; 402267843Sdelphij off_t pos = (off_t)-1; 403133359Sobrien 404267843Sdelphij if (file_reset(ms) == -1) 405267843Sdelphij goto out; 406267843Sdelphij 407159764Sobrien /* 408159764Sobrien * one extra for terminating '\0', and 409159764Sobrien * some overlapping space for matches near EOF 410159764Sobrien */ 411159764Sobrien#define SLOP (1 + sizeof(union VALUETYPE)) 412186690Sobrien if ((buf = CAST(unsigned char *, malloc(HOWMANY + SLOP))) == NULL) 413133359Sobrien return NULL; 414133359Sobrien 415133359Sobrien switch (file_fsmagic(ms, inname, &sb)) { 416169942Sobrien case -1: /* error */ 417159764Sobrien goto done; 418169942Sobrien case 0: /* nothing found */ 419133359Sobrien break; 420169942Sobrien default: /* matched it and printed type */ 421159764Sobrien rv = 0; 422159764Sobrien goto done; 423133359Sobrien } 424133359Sobrien 425267843Sdelphij#ifdef WIN32 426267843Sdelphij /* Place stdin in binary mode, so EOF (Ctrl+Z) doesn't stop early. */ 427267843Sdelphij if (fd == STDIN_FILENO) 428267843Sdelphij _setmode(STDIN_FILENO, O_BINARY); 429267843Sdelphij#endif 430267843Sdelphij 431169942Sobrien if (inname == NULL) { 432169942Sobrien if (fstat(fd, &sb) == 0 && S_ISFIFO(sb.st_mode)) 433169942Sobrien ispipe = 1; 434267843Sdelphij else 435267843Sdelphij pos = lseek(fd, (off_t)0, SEEK_CUR); 436169942Sobrien } else { 437169942Sobrien int flags = O_RDONLY|O_BINARY; 438267843Sdelphij int okstat = stat(inname, &sb) == 0; 439169942Sobrien 440267843Sdelphij if (okstat && S_ISFIFO(sb.st_mode)) { 441226048Sobrien#ifdef O_NONBLOCK 442169942Sobrien flags |= O_NONBLOCK; 443226048Sobrien#endif 444169942Sobrien ispipe = 1; 445169942Sobrien } 446169942Sobrien 447169942Sobrien errno = 0; 448169942Sobrien if ((fd = open(inname, flags)) < 0) { 449267843Sdelphij#ifdef WIN32 450267843Sdelphij /* 451267843Sdelphij * Can't stat, can't open. It may have been opened in 452267843Sdelphij * fsmagic, so if the user doesn't have read permission, 453267843Sdelphij * allow it to say so; otherwise an error was probably 454267843Sdelphij * displayed in fsmagic. 455267843Sdelphij */ 456267843Sdelphij if (!okstat && errno == EACCES) { 457267843Sdelphij sb.st_mode = S_IFBLK; 458267843Sdelphij okstat = 1; 459267843Sdelphij } 460267843Sdelphij#endif 461267843Sdelphij if (okstat && 462267843Sdelphij unreadable_info(ms, sb.st_mode, inname) == -1) 463175296Sobrien goto done; 464192348Sdelphij rv = 0; 465192348Sdelphij goto done; 466169942Sobrien } 467169942Sobrien#ifdef O_NONBLOCK 468169942Sobrien if ((flags = fcntl(fd, F_GETFL)) != -1) { 469169942Sobrien flags &= ~O_NONBLOCK; 470169942Sobrien (void)fcntl(fd, F_SETFL, flags); 471169942Sobrien } 472169942Sobrien#endif 473133359Sobrien } 474133359Sobrien 475133359Sobrien /* 476133359Sobrien * try looking at the first HOWMANY bytes 477133359Sobrien */ 478169942Sobrien if (ispipe) { 479169942Sobrien ssize_t r = 0; 480169942Sobrien 481169942Sobrien while ((r = sread(fd, (void *)&buf[nbytes], 482169962Sobrien (size_t)(HOWMANY - nbytes), 1)) > 0) { 483169942Sobrien nbytes += r; 484169942Sobrien if (r < PIPE_BUF) break; 485169942Sobrien } 486169942Sobrien 487169942Sobrien if (nbytes == 0) { 488169942Sobrien /* We can not read it, but we were able to stat it. */ 489186690Sobrien if (unreadable_info(ms, sb.st_mode, inname) == -1) 490169942Sobrien goto done; 491169942Sobrien rv = 0; 492169942Sobrien goto done; 493169942Sobrien } 494169942Sobrien 495169942Sobrien } else { 496267843Sdelphij /* Windows refuses to read from a big console buffer. */ 497267843Sdelphij size_t howmany = 498267843Sdelphij#if defined(WIN32) && HOWMANY > 8 * 1024 499267843Sdelphij _isatty(fd) ? 8 * 1024 : 500267843Sdelphij#endif 501267843Sdelphij HOWMANY; 502267843Sdelphij if ((nbytes = read(fd, (char *)buf, howmany)) == -1) { 503267843Sdelphij if (inname == NULL && fd != STDIN_FILENO) 504267843Sdelphij file_error(ms, errno, "cannot read fd %d", fd); 505267843Sdelphij else 506267843Sdelphij file_error(ms, errno, "cannot read `%s'", 507267843Sdelphij inname == NULL ? "/dev/stdin" : inname); 508169942Sobrien goto done; 509169942Sobrien } 510133359Sobrien } 511133359Sobrien 512175296Sobrien (void)memset(buf + nbytes, 0, SLOP); /* NUL terminate */ 513175296Sobrien if (file_buffer(ms, fd, inname, buf, (size_t)nbytes) == -1) 514175296Sobrien goto done; 515159764Sobrien rv = 0; 516133359Sobriendone: 517159764Sobrien free(buf); 518267843Sdelphij if (pos != (off_t)-1) 519267843Sdelphij (void)lseek(fd, pos, SEEK_SET); 520133359Sobrien close_and_restore(ms, inname, fd, &sb); 521267843Sdelphijout: 522159764Sobrien return rv == 0 ? file_getbuffer(ms) : NULL; 523133359Sobrien} 524133359Sobrien 525133359Sobrien 526133359Sobrienpublic const char * 527133359Sobrienmagic_buffer(struct magic_set *ms, const void *buf, size_t nb) 528133359Sobrien{ 529267843Sdelphij if (ms == NULL) 530267843Sdelphij return NULL; 531133359Sobrien if (file_reset(ms) == -1) 532133359Sobrien return NULL; 533133359Sobrien /* 534133359Sobrien * The main work is done here! 535186690Sobrien * We have the file name and/or the data buffer to be identified. 536133359Sobrien */ 537169962Sobrien if (file_buffer(ms, -1, NULL, buf, nb) == -1) { 538133359Sobrien return NULL; 539133359Sobrien } 540133359Sobrien return file_getbuffer(ms); 541133359Sobrien} 542133359Sobrien#endif 543133359Sobrien 544133359Sobrienpublic const char * 545133359Sobrienmagic_error(struct magic_set *ms) 546133359Sobrien{ 547267843Sdelphij if (ms == NULL) 548267843Sdelphij return "Magic database is not open"; 549191736Sobrien return (ms->event_flags & EVENT_HAD_ERR) ? ms->o.buf : NULL; 550133359Sobrien} 551133359Sobrien 552133359Sobrienpublic int 553133359Sobrienmagic_errno(struct magic_set *ms) 554133359Sobrien{ 555267843Sdelphij if (ms == NULL) 556267843Sdelphij return EINVAL; 557191736Sobrien return (ms->event_flags & EVENT_HAD_ERR) ? ms->error : 0; 558133359Sobrien} 559133359Sobrien 560133359Sobrienpublic int 561133359Sobrienmagic_setflags(struct magic_set *ms, int flags) 562133359Sobrien{ 563267843Sdelphij if (ms == NULL) 564267843Sdelphij return -1; 565133359Sobrien#if !defined(HAVE_UTIME) && !defined(HAVE_UTIMES) 566133359Sobrien if (flags & MAGIC_PRESERVE_ATIME) 567133359Sobrien return -1; 568133359Sobrien#endif 569133359Sobrien ms->flags = flags; 570133359Sobrien return 0; 571133359Sobrien} 572267843Sdelphij 573267843Sdelphijpublic int 574267843Sdelphijmagic_version(void) 575267843Sdelphij{ 576267843Sdelphij return MAGIC_VERSION; 577267843Sdelphij} 578275698Sdelphij 579275698Sdelphijpublic int 580275698Sdelphijmagic_setparam(struct magic_set *ms, int param, const void *val) 581275698Sdelphij{ 582275698Sdelphij switch (param) { 583275698Sdelphij case MAGIC_PARAM_INDIR_MAX: 584284237Sdelphij ms->indir_max = (uint16_t)*(const size_t *)val; 585275698Sdelphij return 0; 586275698Sdelphij case MAGIC_PARAM_NAME_MAX: 587284237Sdelphij ms->name_max = (uint16_t)*(const size_t *)val; 588275698Sdelphij return 0; 589275698Sdelphij case MAGIC_PARAM_ELF_PHNUM_MAX: 590284237Sdelphij ms->elf_phnum_max = (uint16_t)*(const size_t *)val; 591275698Sdelphij return 0; 592275698Sdelphij case MAGIC_PARAM_ELF_SHNUM_MAX: 593284237Sdelphij ms->elf_shnum_max = (uint16_t)*(const size_t *)val; 594275698Sdelphij return 0; 595276577Sdelphij case MAGIC_PARAM_ELF_NOTES_MAX: 596284237Sdelphij ms->elf_notes_max = (uint16_t)*(const size_t *)val; 597276577Sdelphij return 0; 598275698Sdelphij default: 599275698Sdelphij errno = EINVAL; 600275698Sdelphij return -1; 601275698Sdelphij } 602275698Sdelphij} 603275698Sdelphij 604275698Sdelphijpublic int 605275698Sdelphijmagic_getparam(struct magic_set *ms, int param, void *val) 606275698Sdelphij{ 607275698Sdelphij switch (param) { 608275698Sdelphij case MAGIC_PARAM_INDIR_MAX: 609275698Sdelphij *(size_t *)val = ms->indir_max; 610275698Sdelphij return 0; 611275698Sdelphij case MAGIC_PARAM_NAME_MAX: 612275698Sdelphij *(size_t *)val = ms->name_max; 613275698Sdelphij return 0; 614275698Sdelphij case MAGIC_PARAM_ELF_PHNUM_MAX: 615275698Sdelphij *(size_t *)val = ms->elf_phnum_max; 616275698Sdelphij return 0; 617275698Sdelphij case MAGIC_PARAM_ELF_SHNUM_MAX: 618275698Sdelphij *(size_t *)val = ms->elf_shnum_max; 619275698Sdelphij return 0; 620276577Sdelphij case MAGIC_PARAM_ELF_NOTES_MAX: 621276577Sdelphij *(size_t *)val = ms->elf_notes_max; 622276577Sdelphij return 0; 623275698Sdelphij default: 624275698Sdelphij errno = EINVAL; 625275698Sdelphij return -1; 626275698Sdelphij } 627275698Sdelphij} 628