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apprentice.c
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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. */ /* * apprentice - make one pass through /etc/magic, learning its secrets. */ #include "php.h" #include "file.h" #ifndef lint FILE_RCSID("@(#)$File: apprentice.c,v 1.196 2013/11/19 21:01:12 christos Exp $") #endif /* lint */ #include "magic.h" #include "patchlevel.h" #include <stdlib.h> #if defined(__hpux) && !defined(HAVE_STRTOULL) #if SIZEOF_LONG == 8 # define strtoull strtoul #else # define strtoull __strtoull #endif #endif #ifdef PHP_WIN32 #include "win32/unistd.h" #if _MSC_VER <= 1300 # include "win32/php_strtoi64.h" #endif #define strtoull _strtoui64 #else #include <unistd.h> #endif #include <string.h> #include <assert.h> #include <ctype.h> #include <fcntl.h> #define EATAB {while (isascii((unsigned char) *l) && \ isspace((unsigned char) *l)) ++l;} #define LOWCASE(l) (isupper((unsigned char) (l)) ? \ tolower((unsigned char) (l)) : (l)) /* * Work around a bug in headers on Digital Unix. * At least confirmed for: OSF1 V4.0 878 */ #if defined(__osf__) && defined(__DECC) #ifdef MAP_FAILED #undef MAP_FAILED #endif #endif #ifndef MAP_FAILED #define MAP_FAILED (void *) -1 #endif #ifndef MAP_FILE #define MAP_FILE 0 #endif #define ALLOC_CHUNK (size_t)10 #define ALLOC_INCR (size_t)200 struct magic_entry { struct magic *mp; uint32_t cont_count; uint32_t max_count; }; struct magic_entry_set { struct magic_entry *me; uint32_t count; uint32_t max; }; struct magic_map { void *p; size_t len; struct magic *magic[MAGIC_SETS]; uint32_t nmagic[MAGIC_SETS]; }; int file_formats[FILE_NAMES_SIZE]; const size_t file_nformats = FILE_NAMES_SIZE; const char *file_names[FILE_NAMES_SIZE]; const size_t file_nnames = FILE_NAMES_SIZE; private int getvalue(struct magic_set *ms, struct magic *, const char **, int); private int hextoint(int); private const char *getstr(struct magic_set *, struct magic *, const char *, int); private int parse(struct magic_set *, struct magic_entry *, const char *, size_t, int); private void eatsize(const char **); private int apprentice_1(struct magic_set *, const char *, int); private size_t apprentice_magic_strength(const struct magic *); private int apprentice_sort(const void *, const void *); private void apprentice_list(struct mlist *, int ); private struct magic_map *apprentice_load(struct magic_set *, const char *, int); private struct mlist *mlist_alloc(void); private void mlist_free(struct mlist *); private void byteswap(struct magic *, uint32_t); private void bs1(struct magic *); private uint16_t swap2(uint16_t); private uint32_t swap4(uint32_t); private uint64_t swap8(uint64_t); private char *mkdbname(struct magic_set *, const char *, int); private struct magic_map *apprentice_map(struct magic_set *, const char *); private void apprentice_unmap(struct magic_map *); private int apprentice_compile(struct magic_set *, struct magic_map *, const char *); private int check_format_type(const char *, int); private int check_format(struct magic_set *, struct magic *); private int get_op(char); private int parse_mime(struct magic_set *, struct magic_entry *, const char *); private int parse_strength(struct magic_set *, struct magic_entry *, const char *); private int parse_apple(struct magic_set *, struct magic_entry *, const char *); private size_t magicsize = sizeof(struct magic); private const char usg_hdr[] = "cont\toffset\ttype\topcode\tmask\tvalue\tdesc"; private struct { const char *name; size_t len; int (*fun)(struct magic_set *, struct magic_entry *, const char *); } bang[] = { #define DECLARE_FIELD(name) { # name, sizeof(# name) - 1, parse_ ## name } DECLARE_FIELD(mime), DECLARE_FIELD(apple), DECLARE_FIELD(strength), #undef DECLARE_FIELD { NULL, 0, NULL } }; #include "../data_file.c" struct type_tbl_s { const char name[16]; const size_t len; const int type; const int format; }; /* * XXX - the actual Single UNIX Specification says that "long" means "long", * as in the C data type, but we treat it as meaning "4-byte integer". * Given that the OS X version of file 5.04 did the same, I guess that passes * the actual test; having "long" be dependent on how big a "long" is on * the machine running "file" is silly. */ static const struct type_tbl_s type_tbl[] = { # define XX(s) s, (sizeof(s) - 1) # define XX_NULL "", 0 { XX("invalid"), FILE_INVALID, FILE_FMT_NONE }, { XX("byte"), FILE_BYTE, FILE_FMT_NUM }, { XX("short"), FILE_SHORT, FILE_FMT_NUM }, { XX("default"), FILE_DEFAULT, FILE_FMT_NONE }, { XX("long"), FILE_LONG, FILE_FMT_NUM }, { XX("string"), FILE_STRING, FILE_FMT_STR }, { XX("date"), FILE_DATE, FILE_FMT_STR }, { XX("beshort"), FILE_BESHORT, FILE_FMT_NUM }, { XX("belong"), FILE_BELONG, FILE_FMT_NUM }, { XX("bedate"), FILE_BEDATE, FILE_FMT_STR }, { XX("leshort"), FILE_LESHORT, FILE_FMT_NUM }, { XX("lelong"), FILE_LELONG, FILE_FMT_NUM }, { XX("ledate"), FILE_LEDATE, FILE_FMT_STR }, { XX("pstring"), FILE_PSTRING, FILE_FMT_STR }, { XX("ldate"), FILE_LDATE, FILE_FMT_STR }, { XX("beldate"), FILE_BELDATE, FILE_FMT_STR }, { XX("leldate"), FILE_LELDATE, FILE_FMT_STR }, { XX("regex"), FILE_REGEX, FILE_FMT_STR }, { XX("bestring16"), FILE_BESTRING16, FILE_FMT_STR }, { XX("lestring16"), FILE_LESTRING16, FILE_FMT_STR }, { XX("search"), FILE_SEARCH, FILE_FMT_STR }, { XX("medate"), FILE_MEDATE, FILE_FMT_STR }, { XX("meldate"), FILE_MELDATE, FILE_FMT_STR }, { XX("melong"), FILE_MELONG, FILE_FMT_NUM }, { XX("quad"), FILE_QUAD, FILE_FMT_QUAD }, { XX("lequad"), FILE_LEQUAD, FILE_FMT_QUAD }, { XX("bequad"), FILE_BEQUAD, FILE_FMT_QUAD }, { XX("qdate"), FILE_QDATE, FILE_FMT_STR }, { XX("leqdate"), FILE_LEQDATE, FILE_FMT_STR }, { XX("beqdate"), FILE_BEQDATE, FILE_FMT_STR }, { XX("qldate"), FILE_QLDATE, FILE_FMT_STR }, { XX("leqldate"), FILE_LEQLDATE, FILE_FMT_STR }, { XX("beqldate"), FILE_BEQLDATE, FILE_FMT_STR }, { XX("float"), FILE_FLOAT, FILE_FMT_FLOAT }, { XX("befloat"), FILE_BEFLOAT, FILE_FMT_FLOAT }, { XX("lefloat"), FILE_LEFLOAT, FILE_FMT_FLOAT }, { XX("double"), FILE_DOUBLE, FILE_FMT_DOUBLE }, { XX("bedouble"), FILE_BEDOUBLE, FILE_FMT_DOUBLE }, { XX("ledouble"), FILE_LEDOUBLE, FILE_FMT_DOUBLE }, { XX("leid3"), FILE_LEID3, FILE_FMT_NUM }, { XX("beid3"), FILE_BEID3, FILE_FMT_NUM }, { XX("indirect"), FILE_INDIRECT, FILE_FMT_NUM }, { XX("qwdate"), FILE_QWDATE, FILE_FMT_STR }, { XX("leqwdate"), FILE_LEQWDATE, FILE_FMT_STR }, { XX("beqwdate"), FILE_BEQWDATE, FILE_FMT_STR }, { XX("name"), FILE_NAME, FILE_FMT_NONE }, { XX("use"), FILE_USE, FILE_FMT_NONE }, { XX("clear"), FILE_CLEAR, FILE_FMT_NONE }, { XX_NULL, FILE_INVALID, FILE_FMT_NONE }, }; /* * These are not types, and cannot be preceded by "u" to make them * unsigned. */ static const struct type_tbl_s special_tbl[] = { { XX("name"), FILE_NAME, FILE_FMT_STR }, { XX("use"), FILE_USE, FILE_FMT_STR }, { XX_NULL, FILE_INVALID, FILE_FMT_NONE }, }; # undef XX # undef XX_NULL #ifndef S_ISDIR #define S_ISDIR(mode) ((mode) & _S_IFDIR) #endif private int get_type(const struct type_tbl_s *tbl, const char *l, const char **t) { const struct type_tbl_s *p; for (p = tbl; p->len; p++) { if (strncmp(l, p->name, p->len) == 0) { if (t) *t = l + p->len; break; } } return p->type; } private int get_standard_integer_type(const char *l, const char **t) { int type; if (isalpha((unsigned char)l[1])) { switch (l[1]) { case 'C': /* "dC" and "uC" */ type = FILE_BYTE; break; case 'S': /* "dS" and "uS" */ type = FILE_SHORT; break; case 'I': case 'L': /* * "dI", "dL", "uI", and "uL". * * XXX - the actual Single UNIX Specification says * that "L" means "long", as in the C data type, * but we treat it as meaning "4-byte integer". * Given that the OS X version of file 5.04 did * the same, I guess that passes the actual SUS * validation suite; having "dL" be dependent on * how big a "long" is on the machine running * "file" is silly. */ type = FILE_LONG; break; case 'Q': /* "dQ" and "uQ" */ type = FILE_QUAD; break; default: /* "d{anything else}", "u{anything else}" */ return FILE_INVALID; } l += 2; } else if (isdigit((unsigned char)l[1])) { /* * "d{num}" and "u{num}"; we only support {num} values * of 1, 2, 4, and 8 - the Single UNIX Specification * doesn't say anything about whether arbitrary * values should be supported, but both the Solaris 10 * and OS X Mountain Lion versions of file passed the * Single UNIX Specification validation suite, and * neither of them support values bigger than 8 or * non-power-of-2 values. */ if (isdigit((unsigned char)l[2])) { /* Multi-digit, so > 9 */ return FILE_INVALID; } switch (l[1]) { case '1': type = FILE_BYTE; break; case '2': type = FILE_SHORT; break; case '4': type = FILE_LONG; break; case '8': type = FILE_QUAD; break; default: /* XXX - what about 3, 5, 6, or 7? */ return FILE_INVALID; } l += 2; } else { /* * "d" or "u" by itself. */ type = FILE_LONG; ++l; } if (t) *t = l; return type; } private void init_file_tables(void) { static int done = 0; const struct type_tbl_s *p; if (done) return; done++; for (p = type_tbl; p->len; p++) { assert(p->type < FILE_NAMES_SIZE); file_names[p->type] = p->name; file_formats[p->type] = p->format; } assert(p - type_tbl == FILE_NAMES_SIZE); } private int add_mlist(struct mlist *mlp, struct magic_map *map, size_t idx) { struct mlist *ml; if ((ml = CAST(struct mlist *, emalloc(sizeof(*ml)))) == NULL) return -1; ml->map = idx == 0 ? map : NULL; ml->magic = map->magic[idx]; ml->nmagic = map->nmagic[idx]; mlp->prev->next = ml; ml->prev = mlp->prev; ml->next = mlp; mlp->prev = ml; return 0; } /* * Handle one file or directory. */ private int apprentice_1(struct magic_set *ms, const char *fn, int action) { struct mlist *ml; struct magic_map *map; size_t i; if (magicsize != FILE_MAGICSIZE) { file_error(ms, 0, "magic element size %lu != %lu", (unsigned long)sizeof(*map->magic[0]), (unsigned long)FILE_MAGICSIZE); return -1; } if (action == FILE_COMPILE) { map = apprentice_load(ms, fn, action); if (map == NULL) return -1; return apprentice_compile(ms, map, fn); } map = apprentice_map(ms, fn); if (map == NULL) { if (fn) { if (ms->flags & MAGIC_CHECK) file_magwarn(ms, "using regular magic file `%s'", fn); map = apprentice_load(ms, fn, action); } if (map == NULL) return -1; } for (i = 0; i < MAGIC_SETS; i++) { if (add_mlist(ms->mlist[i], map, i) == -1) { file_oomem(ms, sizeof(*ml)); apprentice_unmap(map); return -1; } } if (action == FILE_LIST) { for (i = 0; i < MAGIC_SETS; i++) { printf("Set %zu:\nBinary patterns:\n", i); apprentice_list(ms->mlist[i], BINTEST); printf("Text patterns:\n"); apprentice_list(ms->mlist[i], TEXTTEST); } } return 0; } protected void file_ms_free(struct magic_set *ms) { size_t i; if (ms == NULL) return; for (i = 0; i < MAGIC_SETS; i++) mlist_free(ms->mlist[i]); if (ms->o.pbuf) { efree(ms->o.pbuf); } if (ms->o.buf) { efree(ms->o.buf); } if (ms->c.li) { efree(ms->c.li); } efree(ms); } protected struct magic_set * file_ms_alloc(int flags) { struct magic_set *ms; size_t i, len; if ((ms = CAST(struct magic_set *, ecalloc((size_t)1, sizeof(struct magic_set)))) == NULL) return NULL; if (magic_setflags(ms, flags) == -1) { errno = EINVAL; goto free; } ms->o.buf = ms->o.pbuf = NULL; len = (ms->c.len = 10) * sizeof(*ms->c.li); if ((ms->c.li = CAST(struct level_info *, emalloc(len))) == NULL) goto free; ms->event_flags = 0; ms->error = -1; for (i = 0; i < MAGIC_SETS; i++) ms->mlist[i] = NULL; ms->file = "unknown"; ms->line = 0; return ms; free: efree(ms); return NULL; } private void apprentice_unmap(struct magic_map *map) { if (map == NULL) return; if (map->p != php_magic_database) { if (map->p == NULL) { int j; for (j = 0; j < MAGIC_SETS; j++) { if (map->magic[j]) { efree(map->magic[j]); } } } else { efree(map->p); } } efree(map); } private struct mlist * mlist_alloc(void) { struct mlist *mlist; if ((mlist = CAST(struct mlist *, ecalloc(1, sizeof(*mlist)))) == NULL) { return NULL; } mlist->next = mlist->prev = mlist; return mlist; } private void mlist_free(struct mlist *mlist) { struct mlist *ml; if (mlist == NULL) return; for (ml = mlist->next; ml != mlist;) { struct mlist *next = ml->next; if (ml->map) apprentice_unmap(ml->map); efree(ml); ml = next; } efree(ml); } /* const char *fn: list of magic files and directories */ protected int file_apprentice(struct magic_set *ms, const char *fn, int action) { char *p, *mfn; int file_err, errs = -1; size_t i; file_reset(ms); /* XXX disabling default magic loading so the compiled in data is used */ #if 0 if ((fn = magic_getpath(fn, action)) == NULL) return -1; #endif init_file_tables(); if (fn == NULL) fn = getenv("MAGIC"); if (fn == NULL) { for (i = 0; i < MAGIC_SETS; i++) { mlist_free(ms->mlist[i]); if ((ms->mlist[i] = mlist_alloc()) == NULL) { file_oomem(ms, sizeof(*ms->mlist[i])); return -1; } } return apprentice_1(ms, fn, action); } if ((mfn = estrdup(fn)) == NULL) { file_oomem(ms, strlen(fn)); return -1; } for (i = 0; i < MAGIC_SETS; i++) { mlist_free(ms->mlist[i]); if ((ms->mlist[i] = mlist_alloc()) == NULL) { file_oomem(ms, sizeof(*ms->mlist[i])); if (i != 0) { --i; do mlist_free(ms->mlist[i]); while (i != 0); } efree(mfn); return -1; } } fn = mfn; while (fn) { p = strchr(fn, PATHSEP); if (p) *p++ = '\0'; if (*fn == '\0') break; file_err = apprentice_1(ms, fn, action); errs = MAX(errs, file_err); fn = p; } efree(mfn); if (errs == -1) { for (i = 0; i < MAGIC_SETS; i++) { mlist_free(ms->mlist[i]); ms->mlist[i] = NULL; } file_error(ms, 0, "could not find any valid magic files!"); return -1; } #if 0 /* * Always leave the database loaded */ if (action == FILE_LOAD) return 0; for (i = 0; i < MAGIC_SETS; i++) { mlist_free(ms->mlist[i]); ms->mlist[i] = NULL; } #endif switch (action) { case FILE_LOAD: case FILE_COMPILE: case FILE_CHECK: case FILE_LIST: return 0; default: file_error(ms, 0, "Invalid action %d", action); return -1; } } /* * Get weight of this magic entry, for sorting purposes. */ private size_t apprentice_magic_strength(const struct magic *m) { #define MULT 10 size_t val = 2 * MULT; /* baseline strength */ switch (m->type) { case FILE_DEFAULT: /* make sure this sorts last */ if (m->factor_op != FILE_FACTOR_OP_NONE) abort(); return 0; case FILE_BYTE: val += 1 * MULT; break; case FILE_SHORT: case FILE_LESHORT: case FILE_BESHORT: val += 2 * MULT; break; case FILE_LONG: case FILE_LELONG: case FILE_BELONG: case FILE_MELONG: val += 4 * MULT; break; case FILE_PSTRING: case FILE_STRING: val += m->vallen * MULT; break; case FILE_BESTRING16: case FILE_LESTRING16: val += m->vallen * MULT / 2; break; case FILE_SEARCH: case FILE_REGEX: val += m->vallen * MAX(MULT / m->vallen, 1); break; case FILE_DATE: case FILE_LEDATE: case FILE_BEDATE: case FILE_MEDATE: case FILE_LDATE: case FILE_LELDATE: case FILE_BELDATE: case FILE_MELDATE: case FILE_FLOAT: case FILE_BEFLOAT: case FILE_LEFLOAT: val += 4 * MULT; break; case FILE_QUAD: case FILE_BEQUAD: case FILE_LEQUAD: case FILE_QDATE: case FILE_LEQDATE: case FILE_BEQDATE: case FILE_QLDATE: case FILE_LEQLDATE: case FILE_BEQLDATE: case FILE_QWDATE: case FILE_LEQWDATE: case FILE_BEQWDATE: case FILE_DOUBLE: case FILE_BEDOUBLE: case FILE_LEDOUBLE: val += 8 * MULT; break; case FILE_INDIRECT: case FILE_NAME: case FILE_USE: break; default: val = 0; (void)fprintf(stderr, "Bad type %d\n", m->type); abort(); } switch (m->reln) { case 'x': /* matches anything penalize */ case '!': /* matches almost anything penalize */ val = 0; break; case '=': /* Exact match, prefer */ val += MULT; break; case '>': case '<': /* comparison match reduce strength */ val -= 2 * MULT; break; case '^': case '&': /* masking bits, we could count them too */ val -= MULT; break; default: (void)fprintf(stderr, "Bad relation %c\n", m->reln); abort(); } if (val == 0) /* ensure we only return 0 for FILE_DEFAULT */ val = 1; switch (m->factor_op) { case FILE_FACTOR_OP_NONE: break; case FILE_FACTOR_OP_PLUS: val += m->factor; break; case FILE_FACTOR_OP_MINUS: val -= m->factor; break; case FILE_FACTOR_OP_TIMES: val *= m->factor; break; case FILE_FACTOR_OP_DIV: val /= m->factor; break; default: abort(); } /* * Magic entries with no description get a bonus because they depend * on subsequent magic entries to print something. */ if (m->desc[0] == '\0') val++; return val; } /* * Sort callback for sorting entries by "strength" (basically length) */ private int apprentice_sort(const void *a, const void *b) { const struct magic_entry *ma = CAST(const struct magic_entry *, a); const struct magic_entry *mb = CAST(const struct magic_entry *, b); size_t sa = apprentice_magic_strength(ma->mp); size_t sb = apprentice_magic_strength(mb->mp); if (sa == sb) return 0; else if (sa > sb) return -1; else return 1; } /* * Shows sorted patterns list in the order which is used for the matching */ private void apprentice_list(struct mlist *mlist, int mode) { uint32_t magindex = 0; struct mlist *ml; for (ml = mlist->next; ml != mlist; ml = ml->next) { for (magindex = 0; magindex < ml->nmagic; magindex++) { struct magic *m = &ml->magic[magindex]; if ((m->flag & mode) != mode) { /* Skip sub-tests */ while (magindex + 1 < ml->nmagic && ml->magic[magindex + 1].cont_level != 0) ++magindex; continue; /* Skip to next top-level test*/ } /* * Try to iterate over the tree until we find item with * description/mimetype. */ while (magindex + 1 < ml->nmagic && ml->magic[magindex + 1].cont_level != 0 && *ml->magic[magindex].desc == '\0' && *ml->magic[magindex].mimetype == '\0') magindex++; printf("Strength = %3" SIZE_T_FORMAT "u : %s [%s]\n", apprentice_magic_strength(m), ml->magic[magindex].desc, ml->magic[magindex].mimetype); } } } private void set_test_type(struct magic *mstart, struct magic *m) { switch (m->type) { case FILE_BYTE: case FILE_SHORT: case FILE_LONG: case FILE_DATE: case FILE_BESHORT: case FILE_BELONG: case FILE_BEDATE: case FILE_LESHORT: case FILE_LELONG: case FILE_LEDATE: case FILE_LDATE: case FILE_BELDATE: case FILE_LELDATE: case FILE_MEDATE: case FILE_MELDATE: case FILE_MELONG: case FILE_QUAD: case FILE_LEQUAD: case FILE_BEQUAD: case FILE_QDATE: case FILE_LEQDATE: case FILE_BEQDATE: case FILE_QLDATE: case FILE_LEQLDATE: case FILE_BEQLDATE: case FILE_QWDATE: case FILE_LEQWDATE: case FILE_BEQWDATE: case FILE_FLOAT: case FILE_BEFLOAT: case FILE_LEFLOAT: case FILE_DOUBLE: case FILE_BEDOUBLE: case FILE_LEDOUBLE: mstart->flag |= BINTEST; break; case FILE_STRING: case FILE_PSTRING: case FILE_BESTRING16: case FILE_LESTRING16: /* Allow text overrides */ if (mstart->str_flags & STRING_TEXTTEST) mstart->flag |= TEXTTEST; else mstart->flag |= BINTEST; break; case FILE_REGEX: case FILE_SEARCH: /* Check for override */ if (mstart->str_flags & STRING_BINTEST) mstart->flag |= BINTEST; if (mstart->str_flags & STRING_TEXTTEST) mstart->flag |= TEXTTEST; if (mstart->flag & (TEXTTEST|BINTEST)) break; /* binary test if pattern is not text */ if (file_looks_utf8(m->value.us, (size_t)m->vallen, NULL, NULL) <= 0) mstart->flag |= BINTEST; else mstart->flag |= TEXTTEST; break; case FILE_DEFAULT: /* can't deduce anything; we shouldn't see this at the top level anyway */ break; case FILE_INVALID: default: /* invalid search type, but no need to complain here */ break; } } private int addentry(struct magic_set *ms, struct magic_entry *me, struct magic_entry_set *mset) { size_t i = me->mp->type == FILE_NAME ? 1 : 0; if (mset[i].count == mset[i].max) { struct magic_entry *mp; mset[i].max += ALLOC_INCR; if ((mp = CAST(struct magic_entry *, erealloc(mset[i].me, sizeof(*mp) * mset[i].max))) == NULL) { file_oomem(ms, sizeof(*mp) * mset[i].max); return -1; } (void)memset(&mp[mset[i].count], 0, sizeof(*mp) * ALLOC_INCR); mset[i].me = mp; } mset[i].me[mset[i].count++] = *me; memset(me, 0, sizeof(*me)); return 0; } /* * Load and parse one file. */ private void load_1(struct magic_set *ms, int action, const char *fn, int *errs, struct magic_entry_set *mset) { char buffer[BUFSIZ + 1]; char *line = NULL; size_t len; size_t lineno = 0; struct magic_entry me; php_stream *stream; TSRMLS_FETCH(); ms->file = fn; stream = php_stream_open_wrapper((char *)fn, "rb", REPORT_ERRORS, NULL); if (stream == NULL) { if (errno != ENOENT) file_error(ms, errno, "cannot read magic file `%s'", fn); (*errs)++; return; } memset(&me, 0, sizeof(me)); /* read and parse this file */ for (ms->line = 1; (line = php_stream_get_line(stream, buffer , BUFSIZ, &len)) != NULL; ms->line++) { if (len == 0) /* null line, garbage, etc */ continue; if (line[len - 1] == '\n') { lineno++; line[len - 1] = '\0'; /* delete newline */ } switch (line[0]) { case '\0': /* empty, do not parse */ case '#': /* comment, do not parse */ continue; case '!': if (line[1] == ':') { size_t i; for (i = 0; bang[i].name != NULL; i++) { if ((size_t)(len - 2) > bang[i].len && memcmp(bang[i].name, line + 2, bang[i].len) == 0) break; } if (bang[i].name == NULL) { file_error(ms, 0, "Unknown !: entry `%s'", line); (*errs)++; continue; } if (me.mp == NULL) { file_error(ms, 0, "No current entry for :!%s type", bang[i].name); (*errs)++; continue; } if ((*bang[i].fun)(ms, &me, line + bang[i].len + 2) != 0) { (*errs)++; continue; } continue; } /*FALLTHROUGH*/ default: again: switch (parse(ms, &me, line, lineno, action)) { case 0: continue; case 1: (void)addentry(ms, &me, mset); goto again; default: (*errs)++; break; } } } if (me.mp) (void)addentry(ms, &me, mset); php_stream_close(stream); } /* * parse a file or directory of files * const char *fn: name of magic file or directory */ private int cmpstrp(const void *p1, const void *p2) { return strcmp(*(char *const *)p1, *(char *const *)p2); } private uint32_t set_text_binary(struct magic_set *ms, struct magic_entry *me, uint32_t nme, uint32_t starttest) { static const char text[] = "text"; static const char binary[] = "binary"; static const size_t len = sizeof(text); uint32_t i = starttest; do { set_test_type(me[starttest].mp, me[i].mp); if ((ms->flags & MAGIC_DEBUG) == 0) continue; (void)fprintf(stderr, "%s%s%s: %s\n", me[i].mp->mimetype, me[i].mp->mimetype[0] == '\0' ? "" : "; ", me[i].mp->desc[0] ? me[i].mp->desc : "(no description)", me[i].mp->flag & BINTEST ? binary : text); if (me[i].mp->flag & BINTEST) { char *p = strstr(me[i].mp->desc, text); if (p && (p == me[i].mp->desc || isspace((unsigned char)p[-1])) && (p + len - me[i].mp->desc == MAXstring || (p[len] == '\0' || isspace((unsigned char)p[len])))) (void)fprintf(stderr, "*** Possible " "binary test for text type\n"); } } while (++i < nme && me[i].mp->cont_level != 0); return i; } private void set_last_default(struct magic_set *ms, struct magic_entry *me, uint32_t nme) { uint32_t i; for (i = 0; i < nme; i++) { if (me[i].mp->cont_level == 0 && me[i].mp->type == FILE_DEFAULT) { while (++i < nme) if (me[i].mp->cont_level == 0) break; if (i != nme) { /* XXX - Ugh! */ ms->line = me[i].mp->lineno; file_magwarn(ms, "level 0 \"default\" did not sort last"); } return; } } } private int coalesce_entries(struct magic_set *ms, struct magic_entry *me, uint32_t nme, struct magic **ma, uint32_t *nma) { uint32_t i, mentrycount = 0; size_t slen; for (i = 0; i < nme; i++) mentrycount += me[i].cont_count; slen = sizeof(**ma) * mentrycount; if ((*ma = CAST(struct magic *, emalloc(slen))) == NULL) { file_oomem(ms, slen); return -1; } mentrycount = 0; for (i = 0; i < nme; i++) { (void)memcpy(*ma + mentrycount, me[i].mp, me[i].cont_count * sizeof(**ma)); mentrycount += me[i].cont_count; } *nma = mentrycount; return 0; } private void magic_entry_free(struct magic_entry *me, uint32_t nme) { uint32_t i; if (me == NULL) return; for (i = 0; i < nme; i++) efree(me[i].mp); efree(me); } private struct magic_map * apprentice_load(struct magic_set *ms, const char *fn, int action) { int errs = 0; uint32_t i, j; size_t files = 0, maxfiles = 0; char **filearr = NULL; struct stat st; struct magic_map *map; struct magic_entry_set mset[MAGIC_SETS]; php_stream *dir; php_stream_dirent d; TSRMLS_FETCH(); memset(mset, 0, sizeof(mset)); ms->flags |= MAGIC_CHECK; /* Enable checks for parsed files */ if ((map = CAST(struct magic_map *, ecalloc(1, sizeof(*map)))) == NULL) { file_oomem(ms, sizeof(*map)); return NULL; } /* print silly verbose header for USG compat. */ if (action == FILE_CHECK) (void)fprintf(stderr, "%s\n", usg_hdr); /* load directory or file */ /* FIXME: Read file names and sort them to prevent non-determinism. See Debian bug #488562. */ if (php_sys_stat(fn, &st) == 0 && S_ISDIR(st.st_mode)) { int mflen; char mfn[MAXPATHLEN]; dir = php_stream_opendir((char *)fn, REPORT_ERRORS, NULL); if (!dir) { errs++; goto out; } while (php_stream_readdir(dir, &d)) { if ((mflen = snprintf(mfn, sizeof(mfn), "%s/%s", fn, d.d_name)) < 0) { file_oomem(ms, strlen(fn) + strlen(d.d_name) + 2); errs++; php_stream_closedir(dir); goto out; } if (stat(mfn, &st) == -1 || !S_ISREG(st.st_mode)) { continue; } if (files >= maxfiles) { size_t mlen; maxfiles = (maxfiles + 1) * 2; mlen = maxfiles * sizeof(*filearr); if ((filearr = CAST(char **, erealloc(filearr, mlen))) == NULL) { file_oomem(ms, mlen); php_stream_closedir(dir); errs++; goto out; } } filearr[files++] = estrndup(mfn, (mflen > sizeof(mfn) - 1)? sizeof(mfn) - 1: mflen); } php_stream_closedir(dir); qsort(filearr, files, sizeof(*filearr), cmpstrp); for (i = 0; i < files; i++) { load_1(ms, action, filearr[i], &errs, mset); efree(filearr[i]); } efree(filearr); } else load_1(ms, action, fn, &errs, mset); if (errs) goto out; for (j = 0; j < MAGIC_SETS; j++) { /* Set types of tests */ for (i = 0; i < mset[j].count; ) { if (mset[j].me[i].mp->cont_level != 0) { i++; continue; } i = set_text_binary(ms, mset[j].me, mset[j].count, i); } qsort(mset[j].me, mset[j].count, sizeof(*mset[j].me), apprentice_sort); /* * Make sure that any level 0 "default" line is last * (if one exists). */ set_last_default(ms, mset[j].me, mset[j].count); /* coalesce per file arrays into a single one */ if (coalesce_entries(ms, mset[j].me, mset[j].count, &map->magic[j], &map->nmagic[j]) == -1) { errs++; goto out; } } out: for (j = 0; j < MAGIC_SETS; j++) magic_entry_free(mset[j].me, mset[j].count); if (errs) { for (j = 0; j < MAGIC_SETS; j++) { if (map->magic[j]) efree(map->magic[j]); } efree(map); return NULL; } return map; } /* * extend the sign bit if the comparison is to be signed */ protected uint64_t file_signextend(struct magic_set *ms, struct magic *m, uint64_t v) { if (!(m->flag & UNSIGNED)) { switch(m->type) { /* * Do not remove the casts below. They are * vital. When later compared with the data, * the sign extension must have happened. */ case FILE_BYTE: v = (signed char) v; break; case FILE_SHORT: case FILE_BESHORT: case FILE_LESHORT: v = (short) v; break; 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_LONG: case FILE_BELONG: case FILE_LELONG: case FILE_MELONG: case FILE_FLOAT: case FILE_BEFLOAT: case FILE_LEFLOAT: v = (int32_t) v; break; case FILE_QUAD: case FILE_BEQUAD: case FILE_LEQUAD: case FILE_QDATE: case FILE_QLDATE: case FILE_QWDATE: case FILE_BEQDATE: case FILE_BEQLDATE: case FILE_BEQWDATE: case FILE_LEQDATE: case FILE_LEQLDATE: case FILE_LEQWDATE: case FILE_DOUBLE: case FILE_BEDOUBLE: case FILE_LEDOUBLE: v = (int64_t) v; break; case FILE_STRING: case FILE_PSTRING: case FILE_BESTRING16: case FILE_LESTRING16: case FILE_REGEX: case FILE_SEARCH: case FILE_DEFAULT: case FILE_INDIRECT: case FILE_NAME: case FILE_USE: case FILE_CLEAR: break; default: if (ms->flags & MAGIC_CHECK) file_magwarn(ms, "cannot happen: m->type=%d\n", m->type); return ~0U; } } return v; } private int string_modifier_check(struct magic_set *ms, struct magic *m) { if ((ms->flags & MAGIC_CHECK) == 0) return 0; if (m->type != FILE_PSTRING && (m->str_flags & PSTRING_LEN) != 0) { file_magwarn(ms, "'/BHhLl' modifiers are only allowed for pascal strings\n"); return -1; } switch (m->type) { case FILE_BESTRING16: case FILE_LESTRING16: if (m->str_flags != 0) { file_magwarn(ms, "no modifiers allowed for 16-bit strings\n"); return -1; } break; case FILE_STRING: case FILE_PSTRING: if ((m->str_flags & REGEX_OFFSET_START) != 0) { file_magwarn(ms, "'/%c' only allowed on regex and search\n", CHAR_REGEX_OFFSET_START); return -1; } break; case FILE_SEARCH: if (m->str_range == 0) { file_magwarn(ms, "missing range; defaulting to %d\n", STRING_DEFAULT_RANGE); m->str_range = STRING_DEFAULT_RANGE; return -1; } break; case FILE_REGEX: if ((m->str_flags & STRING_COMPACT_WHITESPACE) != 0) { file_magwarn(ms, "'/%c' not allowed on regex\n", CHAR_COMPACT_WHITESPACE); return -1; } if ((m->str_flags & STRING_COMPACT_OPTIONAL_WHITESPACE) != 0) { file_magwarn(ms, "'/%c' not allowed on regex\n", CHAR_COMPACT_OPTIONAL_WHITESPACE); return -1; } break; default: file_magwarn(ms, "coding error: m->type=%d\n", m->type); return -1; } return 0; } private int get_op(char c) { switch (c) { case '&': return FILE_OPAND; case '|': return FILE_OPOR; case '^': return FILE_OPXOR; case '+': return FILE_OPADD; case '-': return FILE_OPMINUS; case '*': return FILE_OPMULTIPLY; case '/': return FILE_OPDIVIDE; case '%': return FILE_OPMODULO; default: return -1; } } #ifdef ENABLE_CONDITIONALS private int get_cond(const char *l, const char **t) { static const struct cond_tbl_s { char name[8]; size_t len; int cond; } cond_tbl[] = { { "if", 2, COND_IF }, { "elif", 4, COND_ELIF }, { "else", 4, COND_ELSE }, { "", 0, COND_NONE }, }; const struct cond_tbl_s *p; for (p = cond_tbl; p->len; p++) { if (strncmp(l, p->name, p->len) == 0 && isspace((unsigned char)l[p->len])) { if (t) *t = l + p->len; break; } } return p->cond; } private int check_cond(struct magic_set *ms, int cond, uint32_t cont_level) { int last_cond; last_cond = ms->c.li[cont_level].last_cond; switch (cond) { case COND_IF: if (last_cond != COND_NONE && last_cond != COND_ELIF) { if (ms->flags & MAGIC_CHECK) file_magwarn(ms, "syntax error: `if'"); return -1; } last_cond = COND_IF; break; case COND_ELIF: if (last_cond != COND_IF && last_cond != COND_ELIF) { if (ms->flags & MAGIC_CHECK) file_magwarn(ms, "syntax error: `elif'"); return -1; } last_cond = COND_ELIF; break; case COND_ELSE: if (last_cond != COND_IF && last_cond != COND_ELIF) { if (ms->flags & MAGIC_CHECK) file_magwarn(ms, "syntax error: `else'"); return -1; } last_cond = COND_NONE; break; case COND_NONE: last_cond = COND_NONE; break; } ms->c.li[cont_level].last_cond = last_cond; return 0; } #endif /* ENABLE_CONDITIONALS */ /* * parse one line from magic file, put into magic[index++] if valid */ private int parse(struct magic_set *ms, struct magic_entry *me, const char *line, size_t lineno, int action) { #ifdef ENABLE_CONDITIONALS static uint32_t last_cont_level = 0; #endif size_t i; struct magic *m; const char *l = line; char *t; int op; uint32_t cont_level; int32_t diff; cont_level = 0; /* * Parse the offset. */ while (*l == '>') { ++l; /* step over */ cont_level++; } #ifdef ENABLE_CONDITIONALS if (cont_level == 0 || cont_level > last_cont_level) if (file_check_mem(ms, cont_level) == -1) return -1; last_cont_level = cont_level; #endif if (cont_level != 0) { if (me->mp == NULL) { file_magerror(ms, "No current entry for continuation"); return -1; } if (me->cont_count == 0) { file_magerror(ms, "Continuations present with 0 count"); return -1; } m = &me->mp[me->cont_count - 1]; diff = (int32_t)cont_level - (int32_t)m->cont_level; if (diff > 1) file_magwarn(ms, "New continuation level %u is more " "than one larger than current level %u", cont_level, m->cont_level); if (me->cont_count == me->max_count) { struct magic *nm; size_t cnt = me->max_count + ALLOC_CHUNK; if ((nm = CAST(struct magic *, erealloc(me->mp, sizeof(*nm) * cnt))) == NULL) { file_oomem(ms, sizeof(*nm) * cnt); return -1; } me->mp = m = nm; me->max_count = CAST(uint32_t, cnt); } m = &me->mp[me->cont_count++]; (void)memset(m, 0, sizeof(*m)); m->cont_level = cont_level; } else { static const size_t len = sizeof(*m) * ALLOC_CHUNK; if (me->mp != NULL) return 1; if ((m = CAST(struct magic *, emalloc(len))) == NULL) { file_oomem(ms, len); return -1; } me->mp = m; me->max_count = ALLOC_CHUNK; (void)memset(m, 0, sizeof(*m)); m->factor_op = FILE_FACTOR_OP_NONE; m->cont_level = 0; me->cont_count = 1; } m->lineno = CAST(uint32_t, lineno); if (*l == '&') { /* m->cont_level == 0 checked below. */ ++l; /* step over */ m->flag |= OFFADD; } if (*l == '(') { ++l; /* step over */ m->flag |= INDIR; if (m->flag & OFFADD) m->flag = (m->flag & ~OFFADD) | INDIROFFADD; if (*l == '&') { /* m->cont_level == 0 checked below */ ++l; /* step over */ m->flag |= OFFADD; } } /* Indirect offsets are not valid at level 0. */ if (m->cont_level == 0 && (m->flag & (OFFADD | INDIROFFADD))) if (ms->flags & MAGIC_CHECK) file_magwarn(ms, "relative offset at level 0"); /* get offset, then skip over it */ m->offset = (uint32_t)strtoul(l, &t, 0); if (l == t) if (ms->flags & MAGIC_CHECK) file_magwarn(ms, "offset `%s' invalid", l); l = t; if (m->flag & INDIR) { m->in_type = FILE_LONG; m->in_offset = 0; /* * read [.lbs][+-]nnnnn) */ if (*l == '.') { l++; switch (*l) { case 'l': m->in_type = FILE_LELONG; break; case 'L': m->in_type = FILE_BELONG; break; case 'm': m->in_type = FILE_MELONG; break; case 'h': case 's': m->in_type = FILE_LESHORT; break; case 'H': case 'S': m->in_type = FILE_BESHORT; break; case 'c': case 'b': case 'C': case 'B': m->in_type = FILE_BYTE; break; case 'e': case 'f': case 'g': m->in_type = FILE_LEDOUBLE; break; case 'E': case 'F': case 'G': m->in_type = FILE_BEDOUBLE; break; case 'i': m->in_type = FILE_LEID3; break; case 'I': m->in_type = FILE_BEID3; break; default: if (ms->flags & MAGIC_CHECK) file_magwarn(ms, "indirect offset type `%c' invalid", *l); break; } l++; } m->in_op = 0; if (*l == '~') { m->in_op |= FILE_OPINVERSE; l++; } if ((op = get_op(*l)) != -1) { m->in_op |= op; l++; } if (*l == '(') { m->in_op |= FILE_OPINDIRECT; l++; } if (isdigit((unsigned char)*l) || *l == '-') { m->in_offset = (int32_t)strtol(l, &t, 0); if (l == t) if (ms->flags & MAGIC_CHECK) file_magwarn(ms, "in_offset `%s' invalid", l); l = t; } if (*l++ != ')' || ((m->in_op & FILE_OPINDIRECT) && *l++ != ')')) if (ms->flags & MAGIC_CHECK) file_magwarn(ms, "missing ')' in indirect offset"); } EATAB; #ifdef ENABLE_CONDITIONALS m->cond = get_cond(l, &l); if (check_cond(ms, m->cond, cont_level) == -1) return -1; EATAB; #endif /* * Parse the type. */ if (*l == 'u') { /* * Try it as a keyword type prefixed by "u"; match what * follows the "u". If that fails, try it as an SUS * integer type. */ m->type = get_type(type_tbl, l + 1, &l); if (m->type == FILE_INVALID) { /* * Not a keyword type; parse it as an SUS type, * 'u' possibly followed by a number or C/S/L. */ m->type = get_standard_integer_type(l, &l); } // It's unsigned. if (m->type != FILE_INVALID) m->flag |= UNSIGNED; } else { /* * Try it as a keyword type. If that fails, try it as * an SUS integer type if it begins with "d" or as an * SUS string type if it begins with "s". In any case, * it's not unsigned. */ m->type = get_type(type_tbl, l, &l); if (m->type == FILE_INVALID) { /* * Not a keyword type; parse it as an SUS type, * either 'd' possibly followed by a number or * C/S/L, or just 's'. */ if (*l == 'd') m->type = get_standard_integer_type(l, &l); else if (*l == 's' && !isalpha((unsigned char)l[1])) { m->type = FILE_STRING; ++l; } } } if (m->type == FILE_INVALID) { /* Not found - try it as a special keyword. */ m->type = get_type(special_tbl, l, &l); } if (m->type == FILE_INVALID) { if (ms->flags & MAGIC_CHECK) file_magwarn(ms, "type `%s' invalid", l); /*if (me->mp) { efree(me->mp); me->mp = NULL; }*/ return -1; } /* New-style anding: "0 byte&0x80 =0x80 dynamically linked" */ /* New and improved: ~ & | ^ + - * / % -- exciting, isn't it? */ m->mask_op = 0; if (*l == '~') { if (!IS_LIBMAGIC_STRING(m->type)) m->mask_op |= FILE_OPINVERSE; else if (ms->flags & MAGIC_CHECK) file_magwarn(ms, "'~' invalid for string types"); ++l; } m->str_range = 0; m->str_flags = m->type == FILE_PSTRING ? PSTRING_1_LE : 0; if ((op = get_op(*l)) != -1) { if (!IS_LIBMAGIC_STRING(m->type)) { uint64_t val; ++l; m->mask_op |= op; val = (uint64_t)strtoull(l, &t, 0); l = t; m->num_mask = file_signextend(ms, m, val); eatsize(&l); } else if (op == FILE_OPDIVIDE) { int have_range = 0; while (!isspace((unsigned char)*++l)) { switch (*l) { case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': if (have_range && (ms->flags & MAGIC_CHECK)) file_magwarn(ms, "multiple ranges"); have_range = 1; m->str_range = CAST(uint32_t, strtoul(l, &t, 0)); if (m->str_range == 0) file_magwarn(ms, "zero range"); l = t - 1; break; case CHAR_COMPACT_WHITESPACE: m->str_flags |= STRING_COMPACT_WHITESPACE; break; case CHAR_COMPACT_OPTIONAL_WHITESPACE: m->str_flags |= STRING_COMPACT_OPTIONAL_WHITESPACE; break; case CHAR_IGNORE_LOWERCASE: m->str_flags |= STRING_IGNORE_LOWERCASE; break; case CHAR_IGNORE_UPPERCASE: m->str_flags |= STRING_IGNORE_UPPERCASE; break; case CHAR_REGEX_OFFSET_START: m->str_flags |= REGEX_OFFSET_START; break; case CHAR_BINTEST: m->str_flags |= STRING_BINTEST; break; case CHAR_TEXTTEST: m->str_flags |= STRING_TEXTTEST; break; case CHAR_TRIM: m->str_flags |= STRING_TRIM; break; case CHAR_PSTRING_1_LE: if (m->type != FILE_PSTRING) goto bad; m->str_flags = (m->str_flags & ~PSTRING_LEN) | PSTRING_1_LE; break; case CHAR_PSTRING_2_BE: if (m->type != FILE_PSTRING) goto bad; m->str_flags = (m->str_flags & ~PSTRING_LEN) | PSTRING_2_BE; break; case CHAR_PSTRING_2_LE: if (m->type != FILE_PSTRING) goto bad; m->str_flags = (m->str_flags & ~PSTRING_LEN) | PSTRING_2_LE; break; case CHAR_PSTRING_4_BE: if (m->type != FILE_PSTRING) goto bad; m->str_flags = (m->str_flags & ~PSTRING_LEN) | PSTRING_4_BE; break; case CHAR_PSTRING_4_LE: if (m->type != FILE_PSTRING) goto bad; m->str_flags = (m->str_flags & ~PSTRING_LEN) | PSTRING_4_LE; break; case CHAR_PSTRING_LENGTH_INCLUDES_ITSELF: if (m->type != FILE_PSTRING) goto bad; m->str_flags |= PSTRING_LENGTH_INCLUDES_ITSELF; break; default: bad: if (ms->flags & MAGIC_CHECK) file_magwarn(ms, "string extension `%c' " "invalid", *l); return -1; } /* allow multiple '/' for readability */ if (l[1] == '/' && !isspace((unsigned char)l[2])) l++; } if (string_modifier_check(ms, m) == -1) return -1; } else { if (ms->flags & MAGIC_CHECK) file_magwarn(ms, "invalid string op: %c", *t); return -1; } } /* * We used to set mask to all 1's here, instead let's just not do * anything if mask = 0 (unless you have a better idea) */ EATAB; switch (*l) { case '>': case '<': m->reln = *l; ++l; if (*l == '=') { if (ms->flags & MAGIC_CHECK) { file_magwarn(ms, "%c= not supported", m->reln); return -1; } ++l; } break; /* Old-style anding: "0 byte &0x80 dynamically linked" */ case '&': case '^': case '=': m->reln = *l; ++l; if (*l == '=') { /* HP compat: ignore &= etc. */ ++l; } break; case '!': m->reln = *l; ++l; break; default: m->reln = '='; /* the default relation */ if (*l == 'x' && ((isascii((unsigned char)l[1]) && isspace((unsigned char)l[1])) || !l[1])) { m->reln = *l; ++l; } break; } /* * Grab the value part, except for an 'x' reln. */ if (m->reln != 'x' && getvalue(ms, m, &l, action)) return -1; /* * TODO finish this macro and start using it! * #define offsetcheck {if (offset > HOWMANY-1) * magwarn("offset too big"); } */ /* * Now get last part - the description */ EATAB; if (l[0] == '\b') { ++l; m->flag |= NOSPACE; } else if ((l[0] == '\\') && (l[1] == 'b')) { ++l; ++l; m->flag |= NOSPACE; } for (i = 0; (m->desc[i++] = *l++) != '\0' && i < sizeof(m->desc); ) continue; if (i == sizeof(m->desc)) { m->desc[sizeof(m->desc) - 1] = '\0'; if (ms->flags & MAGIC_CHECK) file_magwarn(ms, "description `%s' truncated", m->desc); } /* * We only do this check while compiling, or if any of the magic * files were not compiled. */ if (ms->flags & MAGIC_CHECK) { if (check_format(ms, m) == -1) return -1; } m->mimetype[0] = '\0'; /* initialise MIME type to none */ return 0; } /* * parse a STRENGTH annotation line from magic file, put into magic[index - 1] * if valid */ private int parse_strength(struct magic_set *ms, struct magic_entry *me, const char *line) { const char *l = line; char *el; unsigned long factor; struct magic *m = &me->mp[0]; if (m->factor_op != FILE_FACTOR_OP_NONE) { file_magwarn(ms, "Current entry already has a strength type: %c %d", m->factor_op, m->factor); return -1; } if (m->type == FILE_NAME) { file_magwarn(ms, "%s: Strength setting is not supported in " "\"name\" magic entries", m->value.s); return -1; } EATAB; switch (*l) { case FILE_FACTOR_OP_NONE: case FILE_FACTOR_OP_PLUS: case FILE_FACTOR_OP_MINUS: case FILE_FACTOR_OP_TIMES: case FILE_FACTOR_OP_DIV: m->factor_op = *l++; break; default: file_magwarn(ms, "Unknown factor op `%c'", *l); return -1; } EATAB; factor = strtoul(l, &el, 0); if (factor > 255) { file_magwarn(ms, "Too large factor `%lu'", factor); goto out; } if (*el && !isspace((unsigned char)*el)) { file_magwarn(ms, "Bad factor `%s'", l); goto out; } m->factor = (uint8_t)factor; if (m->factor == 0 && m->factor_op == FILE_FACTOR_OP_DIV) { file_magwarn(ms, "Cannot have factor op `%c' and factor %u", m->factor_op, m->factor); goto out; } return 0; out: m->factor_op = FILE_FACTOR_OP_NONE; m->factor = 0; return -1; } /* * Parse an Apple CREATOR/TYPE annotation from magic file and put it into * magic[index - 1] */ private int parse_apple(struct magic_set *ms, struct magic_entry *me, const char *line) { size_t i; const char *l = line; struct magic *m = &me->mp[me->cont_count == 0 ? 0 : me->cont_count - 1]; if (m->apple[0] != '\0') { file_magwarn(ms, "Current entry already has a APPLE type " "`%.8s', new type `%s'", m->mimetype, l); return -1; } EATAB; for (i = 0; *l && ((isascii((unsigned char)*l) && isalnum((unsigned char)*l)) || strchr("-+/.", *l)) && i < sizeof(m->apple); m->apple[i++] = *l++) continue; if (i == sizeof(m->apple) && *l) { /* We don't need to NUL terminate here, printing handles it */ if (ms->flags & MAGIC_CHECK) file_magwarn(ms, "APPLE type `%s' truncated %" SIZE_T_FORMAT "u", line, i); } if (i > 0) return 0; else return -1; } /* * parse a MIME annotation line from magic file, put into magic[index - 1] * if valid */ private int parse_mime(struct magic_set *ms, struct magic_entry *me, const char *line) { size_t i; const char *l = line; struct magic *m = &me->mp[me->cont_count == 0 ? 0 : me->cont_count - 1]; if (m->mimetype[0] != '\0') { file_magwarn(ms, "Current entry already has a MIME type `%s'," " new type `%s'", m->mimetype, l); return -1; } EATAB; for (i = 0; *l && ((isascii((unsigned char)*l) && isalnum((unsigned char)*l)) || strchr("-+/.", *l)) && i < sizeof(m->mimetype); m->mimetype[i++] = *l++) continue; if (i == sizeof(m->mimetype)) { m->mimetype[sizeof(m->mimetype) - 1] = '\0'; if (ms->flags & MAGIC_CHECK) file_magwarn(ms, "MIME type `%s' truncated %" SIZE_T_FORMAT "u", m->mimetype, i); } else m->mimetype[i] = '\0'; if (i > 0) return 0; else return -1; } private int check_format_type(const char *ptr, int type) { int quad = 0; if (*ptr == '\0') { /* Missing format string; bad */ return -1; } switch (type) { case FILE_FMT_QUAD: quad = 1; /*FALLTHROUGH*/ case FILE_FMT_NUM: if (*ptr == '-') ptr++; if (*ptr == '.') ptr++; while (isdigit((unsigned char)*ptr)) ptr++; if (*ptr == '.') ptr++; while (isdigit((unsigned char)*ptr)) ptr++; if (quad) { if (*ptr++ != 'l') return -1; if (*ptr++ != 'l') return -1; } switch (*ptr++) { case 'l': switch (*ptr++) { case 'i': case 'd': case 'u': case 'o': case 'x': case 'X': return 0; default: return -1; } case 'h': switch (*ptr++) { case 'h': switch (*ptr++) { case 'i': case 'd': case 'u': case 'o': case 'x': case 'X': return 0; default: return -1; } case 'd': return 0; default: return -1; } case 'i': case 'c': case 'd': case 'u': case 'o': case 'x': case 'X': return 0; default: return -1; } case FILE_FMT_FLOAT: case FILE_FMT_DOUBLE: if (*ptr == '-') ptr++; if (*ptr == '.') ptr++; while (isdigit((unsigned char)*ptr)) ptr++; if (*ptr == '.') ptr++; while (isdigit((unsigned char)*ptr)) ptr++; switch (*ptr++) { case 'e': case 'E': case 'f': case 'F': case 'g': case 'G': return 0; default: return -1; } case FILE_FMT_STR: if (*ptr == '-') ptr++; while (isdigit((unsigned char )*ptr)) ptr++; if (*ptr == '.') { ptr++; while (isdigit((unsigned char )*ptr)) ptr++; } switch (*ptr++) { case 's': return 0; default: return -1; } default: /* internal error */ abort(); } /*NOTREACHED*/ return -1; } /* * Check that the optional printf format in description matches * the type of the magic. */ private int check_format(struct magic_set *ms, struct magic *m) { char *ptr; for (ptr = m->desc; *ptr; ptr++) if (*ptr == '%') break; if (*ptr == '\0') { /* No format string; ok */ return 1; } assert(file_nformats == file_nnames); if (m->type >= file_nformats) { file_magwarn(ms, "Internal error inconsistency between " "m->type and format strings"); return -1; } if (file_formats[m->type] == FILE_FMT_NONE) { file_magwarn(ms, "No format string for `%s' with description " "`%s'", m->desc, file_names[m->type]); return -1; } ptr++; if (check_format_type(ptr, file_formats[m->type]) == -1) { /* * TODO: this error message is unhelpful if the format * string is not one character long */ file_magwarn(ms, "Printf format `%c' is not valid for type " "`%s' in description `%s'", *ptr ? *ptr : '?', file_names[m->type], m->desc); return -1; } for (; *ptr; ptr++) { if (*ptr == '%') { file_magwarn(ms, "Too many format strings (should have at most one) " "for `%s' with description `%s'", file_names[m->type], m->desc); return -1; } } return 0; } /* * Read a numeric value from a pointer, into the value union of a magic * pointer, according to the magic type. Update the string pointer to point * just after the number read. Return 0 for success, non-zero for failure. */ private int getvalue(struct magic_set *ms, struct magic *m, const char **p, int action) { switch (m->type) { case FILE_BESTRING16: case FILE_LESTRING16: case FILE_STRING: case FILE_PSTRING: case FILE_REGEX: case FILE_SEARCH: case FILE_NAME: case FILE_USE: *p = getstr(ms, m, *p, action == FILE_COMPILE); if (*p == NULL) { if (ms->flags & MAGIC_CHECK) file_magwarn(ms, "cannot get string from `%s'", m->value.s); return -1; } return 0; case FILE_FLOAT: case FILE_BEFLOAT: case FILE_LEFLOAT: if (m->reln != 'x') { char *ep; #ifdef HAVE_STRTOF m->value.f = strtof(*p, &ep); #else m->value.f = (float)strtod(*p, &ep); #endif *p = ep; } return 0; case FILE_DOUBLE: case FILE_BEDOUBLE: case FILE_LEDOUBLE: if (m->reln != 'x') { char *ep; m->value.d = strtod(*p, &ep); *p = ep; } return 0; default: if (m->reln != 'x') { char *ep; m->value.q = file_signextend(ms, m, (uint64_t)strtoull(*p, &ep, 0)); *p = ep; eatsize(p); } return 0; } } /* * Convert a string containing C character escapes. Stop at an unescaped * space or tab. * Copy the converted version to "m->value.s", and the length in m->vallen. * Return updated scan pointer as function result. Warn if set. */ private const char * getstr(struct magic_set *ms, struct magic *m, const char *s, int warn) { const char *origs = s; char *p = m->value.s; size_t plen = sizeof(m->value.s); char *origp = p; char *pmax = p + plen - 1; int c; int val; while ((c = *s++) != '\0') { if (isspace((unsigned char) c)) break; if (p >= pmax) { file_error(ms, 0, "string too long: `%s'", origs); return NULL; } if (c == '\\') { switch(c = *s++) { case '\0': if (warn) file_magwarn(ms, "incomplete escape"); goto out; case '\t': if (warn) { file_magwarn(ms, "escaped tab found, use \\t instead"); warn = 0; /* already did */ } /*FALLTHROUGH*/ default: if (warn) { if (isprint((unsigned char)c)) { /* Allow escaping of * ``relations'' */ if (strchr("<>&^=!", c) == NULL && (m->type != FILE_REGEX || strchr("[]().*?^$|{}", c) == NULL)) { file_magwarn(ms, "no " "need to escape " "`%c'", c); } } else { file_magwarn(ms, "unknown escape sequence: " "\\%03o", c); } } /*FALLTHROUGH*/ /* space, perhaps force people to use \040? */ case ' ': #if 0 /* * Other things people escape, but shouldn't need to, * so we disallow them */ case '\'': case '"': case '?': #endif /* Relations */ case '>': case '<': case '&': case '^': case '=': case '!': /* and baskslash itself */ case '\\': *p++ = (char) c; break; case 'a': *p++ = '\a'; break; case 'b': *p++ = '\b'; break; case 'f': *p++ = '\f'; break; case 'n': *p++ = '\n'; break; case 'r': *p++ = '\r'; break; case 't': *p++ = '\t'; break; case 'v': *p++ = '\v'; break; /* \ and up to 3 octal digits */ case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': val = c - '0'; c = *s++; /* try for 2 */ if (c >= '0' && c <= '7') { val = (val << 3) | (c - '0'); c = *s++; /* try for 3 */ if (c >= '0' && c <= '7') val = (val << 3) | (c-'0'); else --s; } else --s; *p++ = (char)val; break; /* \x and up to 2 hex digits */ case 'x': val = 'x'; /* Default if no digits */ c = hextoint(*s++); /* Get next char */ if (c >= 0) { val = c; c = hextoint(*s++); if (c >= 0) val = (val << 4) + c; else --s; } else --s; *p++ = (char)val; break; } } else *p++ = (char)c; } out: *p = '\0'; m->vallen = CAST(unsigned char, (p - origp)); if (m->type == FILE_PSTRING) m->vallen += (unsigned char)file_pstring_length_size(m); return s; } /* Single hex char to int; -1 if not a hex char. */ private int hextoint(int c) { if (!isascii((unsigned char) c)) return -1; if (isdigit((unsigned char) c)) return c - '0'; if ((c >= 'a') && (c <= 'f')) return c + 10 - 'a'; if (( c>= 'A') && (c <= 'F')) return c + 10 - 'A'; return -1; } /* * Print a string containing C character escapes. */ protected void file_showstr(FILE *fp, const char *s, size_t len) { char c; for (;;) { if (len == ~0U) { c = *s++; if (c == '\0') break; } else { if (len-- == 0) break; c = *s++; } if (c >= 040 && c <= 0176) /* TODO isprint && !iscntrl */ (void) fputc(c, fp); else { (void) fputc('\\', fp); switch (c) { case '\a': (void) fputc('a', fp); break; case '\b': (void) fputc('b', fp); break; case '\f': (void) fputc('f', fp); break; case '\n': (void) fputc('n', fp); break; case '\r': (void) fputc('r', fp); break; case '\t': (void) fputc('t', fp); break; case '\v': (void) fputc('v', fp); break; default: (void) fprintf(fp, "%.3o", c & 0377); break; } } } } /* * eatsize(): Eat the size spec from a number [eg. 10UL] */ private void eatsize(const char **p) { const char *l = *p; if (LOWCASE(*l) == 'u') l++; switch (LOWCASE(*l)) { case 'l': /* long */ case 's': /* short */ case 'h': /* short */ case 'b': /* char/byte */ case 'c': /* char/byte */ l++; /*FALLTHROUGH*/ default: break; } *p = l; } /* * handle a compiled file. */ private struct magic_map * apprentice_map(struct magic_set *ms, const char *fn) { uint32_t *ptr; uint32_t version, entries, nentries; int needsbyteswap; char *dbname = NULL; struct magic_map *map; size_t i; php_stream *stream = NULL; php_stream_statbuf st; TSRMLS_FETCH(); if ((map = CAST(struct magic_map *, ecalloc(1, sizeof(*map)))) == NULL) { file_oomem(ms, sizeof(*map)); return NULL; } if (fn == NULL) { map->p = (void *)&php_magic_database; goto internal_loaded; } #ifdef PHP_WIN32 /* Don't bother on windows with php_stream_open_wrapper, return to give apprentice_load() a chance. */ if (php_stream_stat_path_ex((char *)fn, 0, &st, NULL) == SUCCESS) { if (st.sb.st_mode & S_IFDIR) { return NULL; } } #endif dbname = mkdbname(ms, fn, 0); if (dbname == NULL) goto error; stream = php_stream_open_wrapper((char *)fn, "rb", REPORT_ERRORS, NULL); if (!stream) { goto error; } if (php_stream_stat(stream, &st) < 0) { file_error(ms, errno, "cannot stat `%s'", dbname); goto error; } if (st.sb.st_size < 8) { file_error(ms, 0, "file `%s' is too small", dbname); goto error; } map->len = (size_t)st.sb.st_size; if ((map->p = CAST(void *, emalloc(map->len))) == NULL) { file_oomem(ms, map->len); goto error; } if (php_stream_read(stream, map->p, (size_t)st.sb.st_size) != (size_t)st.sb.st_size) { file_badread(ms); goto error; } map->len = 0; #define RET 1 php_stream_close(stream); stream = NULL; internal_loaded: ptr = (uint32_t *)(void *)map->p; if (*ptr != MAGICNO) { if (swap4(*ptr) != MAGICNO) { file_error(ms, 0, "bad magic in `%s'", dbname); goto error; } needsbyteswap = 1; } else needsbyteswap = 0; if (needsbyteswap) version = swap4(ptr[1]); else version = ptr[1]; if (version != VERSIONNO) { file_error(ms, 0, "File %d.%d supports only version %d magic " "files. `%s' is version %d", FILE_VERSION_MAJOR, patchlevel, VERSIONNO, dbname, version); goto error; } /* php_magic_database is a const, performing writes will segfault. This is for big-endian machines only, PPC and Sparc specifically. Consider static variable or MINIT in future. */ if (needsbyteswap && fn == NULL) { map->p = emalloc(sizeof(php_magic_database)); map->p = memcpy(map->p, php_magic_database, sizeof(php_magic_database)); } if (NULL != fn) { nentries = (uint32_t)(st.sb.st_size / sizeof(struct magic)); entries = (uint32_t)(st.sb.st_size / sizeof(struct magic)); if ((off_t)(entries * sizeof(struct magic)) != st.sb.st_size) { file_error(ms, 0, "Size of `%s' %llu is not a multiple of %zu", dbname, (unsigned long long)st.sb.st_size, sizeof(struct magic)); goto error; } } map->magic[0] = CAST(struct magic *, map->p) + 1; nentries = 0; for (i = 0; i < MAGIC_SETS; i++) { if (needsbyteswap) map->nmagic[i] = swap4(ptr[i + 2]); else map->nmagic[i] = ptr[i + 2]; if (i != MAGIC_SETS - 1) map->magic[i + 1] = map->magic[i] + map->nmagic[i]; nentries += map->nmagic[i]; } if (NULL != fn && entries != nentries + 1) { file_error(ms, 0, "Inconsistent entries in `%s' %u != %u", dbname, entries, nentries + 1); goto error; } if (needsbyteswap) for (i = 0; i < MAGIC_SETS; i++) byteswap(map->magic[i], map->nmagic[i]); if (dbname) { efree(dbname); } return map; error: if (stream) { php_stream_close(stream); } apprentice_unmap(map); if (dbname) { efree(dbname); } return NULL; } private const uint32_t ar[] = { MAGICNO, VERSIONNO }; /* * handle an mmaped file. */ private int apprentice_compile(struct magic_set *ms, struct magic_map *map, const char *fn) { static const size_t nm = sizeof(*map->nmagic) * MAGIC_SETS; static const size_t m = sizeof(**map->magic); int fd = -1; size_t len; char *dbname; int rv = -1; uint32_t i; php_stream *stream; TSRMLS_FETCH(); dbname = mkdbname(ms, fn, 0); if (dbname == NULL) goto out; /* wb+ == O_WRONLY|O_CREAT|O_TRUNC|O_BINARY */ stream = php_stream_open_wrapper((char *)fn, "wb+", REPORT_ERRORS, NULL); if (!stream) { file_error(ms, errno, "cannot open `%s'", dbname); goto out; } if (write(fd, ar, sizeof(ar)) != (ssize_t)sizeof(ar)) { file_error(ms, errno, "error writing `%s'", dbname); goto out; } if (php_stream_write(stream, (const char *)map->nmagic, nm) != (ssize_t)nm) { file_error(ms, errno, "error writing `%s'", dbname); goto out; } assert(nm + sizeof(ar) < m); if (php_stream_seek(stream,(off_t)sizeof(struct magic), SEEK_SET) != sizeof(struct magic)) { file_error(ms, errno, "error seeking `%s'", dbname); goto out; } for (i = 0; i < MAGIC_SETS; i++) { len = m * map->nmagic[i]; if (php_stream_write(stream, (const char *)map->magic[i], len) != (ssize_t)len) { file_error(ms, errno, "error writing `%s'", dbname); goto out; } } if (stream) { php_stream_close(stream); } rv = 0; out: efree(dbname); return rv; } private const char ext[] = ".mgc"; /* * make a dbname */ private char * mkdbname(struct magic_set *ms, const char *fn, int strip) { const char *p, *q; char *buf; TSRMLS_FETCH(); if (strip) { if ((p = strrchr(fn, '/')) != NULL) fn = ++p; } for (q = fn; *q; q++) continue; /* Look for .mgc */ for (p = ext + sizeof(ext) - 1; p >= ext && q >= fn; p--, q--) if (*p != *q) break; /* Did not find .mgc, restore q */ if (p >= ext) while (*q) q++; q++; /* Compatibility with old code that looked in .mime */ if (ms->flags & MAGIC_MIME) { spprintf(&buf, MAXPATHLEN, "%.*s.mime%s", (int)(q - fn), fn, ext); #ifdef PHP_WIN32 if (VCWD_ACCESS(buf, R_OK) == 0) { #else if (VCWD_ACCESS(buf, R_OK) != -1) { #endif ms->flags &= MAGIC_MIME_TYPE; return buf; } efree(buf); } spprintf(&buf, MAXPATHLEN, "%.*s%s", (int)(q - fn), fn, ext); /* Compatibility with old code that looked in .mime */ if (strstr(p, ".mime") != NULL) ms->flags &= MAGIC_MIME_TYPE; return buf; } /* * Byteswap an mmap'ed file if needed */ private void byteswap(struct magic *magic, uint32_t nmagic) { uint32_t i; for (i = 0; i < nmagic; i++) bs1(&magic[i]); } /* * swap a short */ private uint16_t swap2(uint16_t sv) { uint16_t rv; uint8_t *s = (uint8_t *)(void *)&sv; uint8_t *d = (uint8_t *)(void *)&rv; d[0] = s[1]; d[1] = s[0]; return rv; } /* * swap an int */ private uint32_t swap4(uint32_t sv) { uint32_t rv; uint8_t *s = (uint8_t *)(void *)&sv; uint8_t *d = (uint8_t *)(void *)&rv; d[0] = s[3]; d[1] = s[2]; d[2] = s[1]; d[3] = s[0]; return rv; } /* * swap a quad */ private uint64_t swap8(uint64_t sv) { uint64_t rv; uint8_t *s = (uint8_t *)(void *)&sv; uint8_t *d = (uint8_t *)(void *)&rv; #if 0 d[0] = s[3]; d[1] = s[2]; d[2] = s[1]; d[3] = s[0]; d[4] = s[7]; d[5] = s[6]; d[6] = s[5]; d[7] = s[4]; #else d[0] = s[7]; d[1] = s[6]; d[2] = s[5]; d[3] = s[4]; d[4] = s[3]; d[5] = s[2]; d[6] = s[1]; d[7] = s[0]; #endif return rv; } /* * byteswap a single magic entry */ private void bs1(struct magic *m) { m->cont_level = swap2(m->cont_level); m->offset = swap4((uint32_t)m->offset); m->in_offset = swap4((uint32_t)m->in_offset); m->lineno = swap4((uint32_t)m->lineno); if (IS_LIBMAGIC_STRING(m->type)) { m->str_range = swap4(m->str_range); m->str_flags = swap4(m->str_flags); } else { m->value.q = swap8(m->value.q); m->num_mask = swap8(m->num_mask); } } protected size_t file_pstring_length_size(const struct magic *m) { switch (m->str_flags & PSTRING_LEN) { case PSTRING_1_LE: return 1; case PSTRING_2_LE: case PSTRING_2_BE: return 2; case PSTRING_4_LE: case PSTRING_4_BE: return 4; default: abort(); /* Impossible */ return 1; } } protected size_t file_pstring_get_length(const struct magic *m, const char *s) { size_t len = 0; switch (m->str_flags & PSTRING_LEN) { case PSTRING_1_LE: len = *s; break; case PSTRING_2_LE: len = (s[1] << 8) | s[0]; break; case PSTRING_2_BE: len = (s[0] << 8) | s[1]; break; case PSTRING_4_LE: len = (s[3] << 24) | (s[2] << 16) | (s[1] << 8) | s[0]; break; case PSTRING_4_BE: len = (s[0] << 24) | (s[1] << 16) | (s[2] << 8) | s[3]; break; default: abort(); /* Impossible */ } if (m->str_flags & PSTRING_LENGTH_INCLUDES_ITSELF) len -= file_pstring_length_size(m); return len; } protected int file_magicfind(struct magic_set *ms, const char *name, struct mlist *v) { uint32_t i, j; struct mlist *mlist, *ml; mlist = ms->mlist[1]; for (ml = mlist->next; ml != mlist; ml = ml->next) { struct magic *ma = ml->magic; uint32_t nma = ml->nmagic; for (i = 0; i < nma; i++) { if (ma[i].type != FILE_NAME) continue; if (strcmp(ma[i].value.s, name) == 0) { v->magic = &ma[i]; for (j = i + 1; j < nma; j++) if (ma[j].cont_level == 0) break; v->nmagic = j - i; return 0; } } } return -1; }
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