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FILE5_35
src/fsmagic.c
426 строк
11 KB
Christos Zoulas
PR/32: Chai T. Rex: Handle file -s <(echo '#!/bin/sh\n') on bash/linux
02 окт 2018, 03:38
02 окт 2018, 03:38
adbe541
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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. */ /* * fsmagic - magic based on filesystem info - directory, special files, etc. */ #include "file.h" #ifndef lint FILE_RCSID("@(#)$File: fsmagic.c,v 1.79 2018/10/02 00:38:33 christos Exp $") #endif /* lint */ #include "magic.h" #include <string.h> #ifdef HAVE_UNISTD_H #include <unistd.h> #endif #include <stdlib.h> /* Since major is a function on SVR4, we cannot use `ifndef major'. */ #ifdef MAJOR_IN_MKDEV # include <sys/mkdev.h> # define HAVE_MAJOR #endif #ifdef MAJOR_IN_SYSMACROS # include <sys/sysmacros.h> # define HAVE_MAJOR #endif #ifdef major /* Might be defined in sys/types.h. */ # define HAVE_MAJOR #endif #ifdef WIN32 # define WIN32_LEAN_AND_MEAN # include <windows.h> #endif #ifndef HAVE_MAJOR # define major(dev) (((dev) >> 8) & 0xff) # define minor(dev) ((dev) & 0xff) #endif #undef HAVE_MAJOR #ifdef S_IFLNK private int bad_link(struct magic_set *ms, int err, char *buf) { int mime = ms->flags & MAGIC_MIME; if ((mime & MAGIC_MIME_TYPE) && file_printf(ms, "inode/symlink") == -1) return -1; else if (!mime) { if (ms->flags & MAGIC_ERROR) { file_error(ms, err, "broken symbolic link to %s", buf); return -1; } if (file_printf(ms, "broken symbolic link to %s", buf) == -1) return -1; } return 1; } #endif private int handle_mime(struct magic_set *ms, int mime, const char *str) { if ((mime & MAGIC_MIME_TYPE)) { if (file_printf(ms, "inode/%s", str) == -1) return -1; if ((mime & MAGIC_MIME_ENCODING) && file_printf(ms, "; charset=") == -1) return -1; } if ((mime & MAGIC_MIME_ENCODING) && file_printf(ms, "binary") == -1) return -1; return 0; } protected int file_fsmagic(struct magic_set *ms, const char *fn, struct stat *sb) { int ret, did = 0; int mime = ms->flags & MAGIC_MIME; int silent = ms->flags & (MAGIC_APPLE|MAGIC_EXTENSION); #ifdef S_IFLNK char buf[BUFSIZ+4]; ssize_t nch; struct stat tstatbuf; #endif if (fn == NULL) return 0; #define COMMA (did++ ? ", " : "") /* * Fstat is cheaper but fails for files you don't have read perms on. * On 4.2BSD and similar systems, use lstat() to identify symlinks. */ #ifdef S_IFLNK if ((ms->flags & MAGIC_SYMLINK) == 0) ret = lstat(fn, sb); else #endif ret = stat(fn, sb); /* don't merge into if; see "ret =" above */ #ifdef WIN32 { HANDLE hFile = CreateFile((LPCSTR)fn, 0, FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL); if (hFile != INVALID_HANDLE_VALUE) { /* * Stat failed, but we can still open it - assume it's * a block device, if nothing else. */ if (ret) { sb->st_mode = S_IFBLK; ret = 0; } switch (GetFileType(hFile)) { case FILE_TYPE_CHAR: sb->st_mode |= S_IFCHR; sb->st_mode &= ~S_IFREG; break; case FILE_TYPE_PIPE: sb->st_mode |= S_IFIFO; sb->st_mode &= ~S_IFREG; break; } CloseHandle(hFile); } } #endif if (ret) { if (ms->flags & MAGIC_ERROR) { file_error(ms, errno, "cannot stat `%s'", fn); return -1; } if (file_printf(ms, "cannot open `%s' (%s)", fn, strerror(errno)) == -1) return -1; return 0; } ret = 1; if (!mime && !silent) { #ifdef S_ISUID if (sb->st_mode & S_ISUID) if (file_printf(ms, "%ssetuid", COMMA) == -1) return -1; #endif #ifdef S_ISGID if (sb->st_mode & S_ISGID) if (file_printf(ms, "%ssetgid", COMMA) == -1) return -1; #endif #ifdef S_ISVTX if (sb->st_mode & S_ISVTX) if (file_printf(ms, "%ssticky", COMMA) == -1) return -1; #endif } switch (sb->st_mode & S_IFMT) { case S_IFDIR: if (mime) { if (handle_mime(ms, mime, "directory") == -1) return -1; } else if (silent) { } else if (file_printf(ms, "%sdirectory", COMMA) == -1) return -1; break; #ifdef S_IFCHR case S_IFCHR: /* * If -s has been specified, treat character special files * like ordinary files. Otherwise, just report that they * are block special files and go on to the next file. */ if ((ms->flags & MAGIC_DEVICES) != 0) { ret = 0; break; } if (mime) { if (handle_mime(ms, mime, "chardevice") == -1) return -1; } else if (silent) { } else { #ifdef HAVE_STRUCT_STAT_ST_RDEV # ifdef dv_unit if (file_printf(ms, "%scharacter special (%d/%d/%d)", COMMA, major(sb->st_rdev), dv_unit(sb->st_rdev), dv_subunit(sb->st_rdev)) == -1) return -1; # else if (file_printf(ms, "%scharacter special (%ld/%ld)", COMMA, (long)major(sb->st_rdev), (long)minor(sb->st_rdev)) == -1) return -1; # endif #else if (file_printf(ms, "%scharacter special", COMMA) == -1) return -1; #endif } break; #endif #ifdef S_IFBLK case S_IFBLK: /* * If -s has been specified, treat block special files * like ordinary files. Otherwise, just report that they * are block special files and go on to the next file. */ if ((ms->flags & MAGIC_DEVICES) != 0) { ret = 0; break; } if (mime) { if (handle_mime(ms, mime, "blockdevice") == -1) return -1; } else if (silent) { } else { #ifdef HAVE_STRUCT_STAT_ST_RDEV # ifdef dv_unit if (file_printf(ms, "%sblock special (%d/%d/%d)", COMMA, major(sb->st_rdev), dv_unit(sb->st_rdev), dv_subunit(sb->st_rdev)) == -1) return -1; # else if (file_printf(ms, "%sblock special (%ld/%ld)", COMMA, (long)major(sb->st_rdev), (long)minor(sb->st_rdev)) == -1) return -1; # endif #else if (file_printf(ms, "%sblock special", COMMA) == -1) return -1; #endif } break; #endif /* TODO add code to handle V7 MUX and Blit MUX files */ #ifdef S_IFIFO case S_IFIFO: if((ms->flags & MAGIC_DEVICES) != 0) break; if (mime) { if (handle_mime(ms, mime, "fifo") == -1) return -1; } else if (silent) { } else if (file_printf(ms, "%sfifo (named pipe)", COMMA) == -1) return -1; break; #endif #ifdef S_IFDOOR case S_IFDOOR: if (mime) { if (handle_mime(ms, mime, "door") == -1) return -1; } else if (silent) { } else if (file_printf(ms, "%sdoor", COMMA) == -1) return -1; break; #endif #ifdef S_IFLNK case S_IFLNK: if ((nch = readlink(fn, buf, BUFSIZ-1)) <= 0) { if (ms->flags & MAGIC_ERROR) { file_error(ms, errno, "unreadable symlink `%s'", fn); return -1; } if (mime) { if (handle_mime(ms, mime, "symlink") == -1) return -1; } else if (silent) { } else if (file_printf(ms, "%sunreadable symlink `%s' (%s)", COMMA, fn, strerror(errno)) == -1) return -1; break; } buf[nch] = '\0'; /* readlink(2) does not do this */ /* If broken symlink, say so and quit early. */ #ifdef __linux__ /* * linux procfs/devfs makes symlinks like pipe:[3515864880] * that we can't stat their readlink output, so stat the * original filename instead. */ if (stat(fn, &tstatbuf) < 0) return bad_link(ms, errno, buf); #else if (*buf == '/') { if (stat(buf, &tstatbuf) < 0) return bad_link(ms, errno, buf); } else { char *tmp; char buf2[BUFSIZ+BUFSIZ+4]; if ((tmp = strrchr(fn, '/')) == NULL) { tmp = buf; /* in current directory anyway */ } else { if (tmp - fn + 1 > BUFSIZ) { if (ms->flags & MAGIC_ERROR) { file_error(ms, 0, "path too long: `%s'", buf); return -1; } if (mime) { if (handle_mime(ms, mime, "x-path-too-long") == -1) return -1; } else if (silent) { } else if (file_printf(ms, "%spath too long: `%s'", COMMA, fn) == -1) return -1; break; } /* take dir part */ (void)strlcpy(buf2, fn, sizeof buf2); buf2[tmp - fn + 1] = '\0'; /* plus (rel) link */ (void)strlcat(buf2, buf, sizeof buf2); tmp = buf2; } if (stat(tmp, &tstatbuf) < 0) return bad_link(ms, errno, buf); } #endif /* Otherwise, handle it. */ if ((ms->flags & MAGIC_SYMLINK) != 0) { const char *p; ms->flags &= MAGIC_SYMLINK; p = magic_file(ms, buf); ms->flags |= MAGIC_SYMLINK; if (p == NULL) return -1; } else { /* just print what it points to */ if (mime) { if (handle_mime(ms, mime, "symlink") == -1) return -1; } else if (silent) { } else if (file_printf(ms, "%ssymbolic link to %s", COMMA, buf) == -1) return -1; } break; #endif #ifdef S_IFSOCK #ifndef __COHERENT__ case S_IFSOCK: if (mime) { if (handle_mime(ms, mime, "socket") == -1) return -1; } else if (silent) { } else if (file_printf(ms, "%ssocket", COMMA) == -1) return -1; break; #endif #endif case S_IFREG: /* * regular file, check next possibility * * If stat() tells us the file has zero length, report here that * the file is empty, so we can skip all the work of opening and * reading the file. * But if the -s option has been given, we skip this * optimization, since on some systems, stat() reports zero * size for raw disk partitions. (If the block special device * really has zero length, the fact that it is empty will be * detected and reported correctly when we read the file.) */ if ((ms->flags & MAGIC_DEVICES) == 0 && sb->st_size == 0) { if (mime) { if (handle_mime(ms, mime, "x-empty") == -1) return -1; } else if (silent) { } else if (file_printf(ms, "%sempty", COMMA) == -1) return -1; break; } ret = 0; break; default: file_error(ms, 0, "invalid mode 0%o", sb->st_mode); return -1; /*NOTREACHED*/ } if (!silent && !mime && did && ret == 0) { if (file_printf(ms, " ") == -1) return -1; } return ret; }