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Diffstat (limited to '')
| -rw-r--r-- | lib/util/fnmatch.c | 502 |
1 files changed, 502 insertions, 0 deletions
diff --git a/lib/util/fnmatch.c b/lib/util/fnmatch.c new file mode 100644 index 0000000..3526fda --- /dev/null +++ b/lib/util/fnmatch.c @@ -0,0 +1,502 @@ +/* $OpenBSD: fnmatch.c,v 1.15 2011/02/10 21:31:59 stsp Exp $ */ + +/* Copyright (c) 2011, VMware, Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * 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. + * * Neither the name of the VMware, Inc. nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 VMWARE, INC. 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. + */ + +/* + * Copyright (c) 2008, 2016 Todd C. Miller <millert@openbsd.org> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +/* + * This is an open source non-commercial project. Dear PVS-Studio, please check it. + * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com + */ + +/* Authored by William A. Rowe Jr. <wrowe; apache.org, vmware.com>, April 2011 + * + * Derived from The Open Group Base Specifications Issue 7, IEEE Std 1003.1-2008 + * as described in; + * http://pubs.opengroup.org/onlinepubs/9699919799/functions/fnmatch.html + * + * Filename pattern matches defined in section 2.13, "Pattern Matching Notation" + * from chapter 2. "Shell Command Language" + * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_13 + * where; 1. A bracket expression starting with an unquoted <circumflex> '^' + * character CONTINUES to specify a non-matching list; 2. an explicit <period> '.' + * in a bracket expression matching list, e.g. "[.abc]" does NOT match a leading + * <period> in a filename; 3. a <left-square-bracket> '[' which does not introduce + * a valid bracket expression is treated as an ordinary character; 4. a differing + * number of consecutive slashes within pattern and string will NOT match; + * 5. a trailing '\' in FNM_ESCAPE mode is treated as an ordinary '\' character. + * + * Bracket expansion defined in section 9.3.5, "RE Bracket Expression", + * from chapter 9, "Regular Expressions" + * http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_03_05 + * with no support for collating symbols, equivalence class expressions or + * character class expressions. A partial range expression with a leading + * hyphen following a valid range expression will match only the ordinary + * <hyphen> and the ending character (e.g. "[a-m-z]" will match characters + * 'a' through 'm', a <hyphen> '-', or a 'z'). + * + * Supports BSD extensions FNM_LEADING_DIR to match pattern to the end of one + * path segment of string, and FNM_CASEFOLD to ignore alpha case. + * + * NOTE: Only POSIX/C single byte locales are correctly supported at this time. + * Notably, non-POSIX locales with FNM_CASEFOLD produce undefined results, + * particularly in ranges of mixed case (e.g. "[A-z]") or spanning alpha and + * nonalpha characters within a range. + * + * XXX comments below indicate porting required for multi-byte character sets + * and non-POSIX locale collation orders; requires mbr* APIs to track shift + * state of pattern and string (rewinding pattern and string repeatedly). + * + * Certain parts of the code assume 0x00-0x3F are unique with any MBCS (e.g. + * UTF-8, SHIFT-JIS, etc). Any implementation allowing '\' as an alternate + * path delimiter must be aware that 0x5C is NOT unique within SHIFT-JIS. + */ + +#include <config.h> + +#ifndef HAVE_FNMATCH + +#include <sys/types.h> + +#include <stdio.h> +#include <ctype.h> +#ifdef HAVE_STRING_H +# include <string.h> +#endif /* HAVE_STRING_H */ +#ifdef HAVE_STRINGS_H +# include <strings.h> +#endif /* HAVE_STRINGS_H */ + +#include "sudo_compat.h" +#include "compat/charclass.h" +#include "compat/fnmatch.h" + +#define RANGE_MATCH 1 +#define RANGE_NOMATCH 0 +#define RANGE_ERROR (-1) + +static int +classmatch(const char *pattern, char test, int foldcase, const char **ep) +{ + const char * const mismatch = pattern; + const char *colon; + struct cclass *cc; + int result = RANGE_NOMATCH; + size_t len; + + if (pattern[0] != '[' || pattern[1] != ':') { + *ep = mismatch; + return RANGE_ERROR; + } + pattern += 2; + + if ((colon = strchr(pattern, ':')) == NULL || colon[1] != ']') { + *ep = mismatch; + return RANGE_ERROR; + } + *ep = colon + 2; + len = (size_t)(colon - pattern); + + if (foldcase && strncmp(pattern, "upper:]", 7) == 0) + pattern = "lower:]"; + for (cc = cclasses; cc->name != NULL; cc++) { + if (!strncmp(pattern, cc->name, len) && cc->name[len] == '\0') { + if (cc->isctype((unsigned char)test)) + result = RANGE_MATCH; + break; + } + } + if (cc->name == NULL) { + /* invalid character class, treat as normal text */ + *ep = mismatch; + result = RANGE_ERROR; + } + return result; +} + +/* Most MBCS/collation/case issues handled here. Wildcard '*' is not handled. + * EOS '\0' and the FNM_PATHNAME '/' delimiters are not advanced over, + * however the "\/" sequence is advanced to '/'. + * + * Both pattern and string are **char to support pointer increment of arbitrary + * multibyte characters for the given locale, in a later iteration of this code + */ +static int fnmatch_ch(const char **pattern, const char **string, int flags) +{ + const char * const mismatch = *pattern; + const int nocase = !!(flags & FNM_CASEFOLD); + const int escape = !(flags & FNM_NOESCAPE); + const int slash = !!(flags & FNM_PATHNAME); + int result = FNM_NOMATCH; + const char *startch; + int negate; + + if (**pattern == '[') + { + ++*pattern; + + /* Handle negation, either leading ! or ^ operators (never both) */ + negate = ((**pattern == '!') || (**pattern == '^')); + if (negate) + ++*pattern; + + /* ']' is an ordinary character at the start of the range pattern */ + if (**pattern == ']') + goto leadingclosebrace; + + while (**pattern) + { + if (**pattern == ']') { + ++*pattern; + /* XXX: Fix for MBCS character width */ + ++*string; + return (result ^ negate); + } + + if (escape && (**pattern == '\\')) { + ++*pattern; + + /* Patterns must be terminated with ']', not EOS */ + if (!**pattern) + break; + } + + /* Patterns must be terminated with ']' not '/' */ + if (slash && (**pattern == '/')) + break; + + /* Match character classes. */ + switch (classmatch(*pattern, **string, nocase, pattern)) { + case RANGE_MATCH: + result = 0; + continue; + case RANGE_NOMATCH: + /* Valid character class but no match. */ + continue; + default: + /* Not a valid character class. */ + break; + } + if (!**pattern) + break; + +leadingclosebrace: + /* Look at only well-formed range patterns; + * "x-]" is not allowed unless escaped ("x-\]") + * XXX: Fix for locale/MBCS character width + */ + if (((*pattern)[1] == '-') && ((*pattern)[2] != ']')) + { + startch = *pattern; + *pattern += (escape && ((*pattern)[2] == '\\')) ? 3 : 2; + + /* NOT a properly balanced [expr] pattern, EOS terminated + * or ranges containing a slash in FNM_PATHNAME mode pattern + * fall out to to the rewind and test '[' literal code path + */ + if (!**pattern || (slash && (**pattern == '/'))) + break; + + /* XXX: handle locale/MBCS comparison, advance by MBCS char width */ + if ((**string >= *startch) && (**string <= **pattern)) + result = 0; + else if (nocase && (isupper((unsigned char)**string) || + isupper((unsigned char)*startch) || + isupper((unsigned char)**pattern)) + && (tolower((unsigned char)**string) >= tolower((unsigned char)*startch)) + && (tolower((unsigned char)**string) <= tolower((unsigned char)**pattern))) + result = 0; + + ++*pattern; + continue; + } + + /* XXX: handle locale/MBCS comparison, advance by MBCS char width */ + if ((**string == **pattern)) + result = 0; + else if (nocase && (isupper((unsigned char)**string) || + isupper((unsigned char)**pattern)) + && (tolower((unsigned char)**string) == tolower((unsigned char)**pattern))) + result = 0; + + ++*pattern; + } + + /* NOT a properly balanced [expr] pattern; Rewind + * and reset result to test '[' literal + */ + *pattern = mismatch; + result = FNM_NOMATCH; + } + else if (**pattern == '?') { + /* Optimize '?' match before unescaping **pattern */ + if (!**string || (slash && (**string == '/'))) + return FNM_NOMATCH; + result = 0; + goto fnmatch_ch_success; + } + else if (escape && (**pattern == '\\') && (*pattern)[1]) { + ++*pattern; + } + + /* XXX: handle locale/MBCS comparison, advance by the MBCS char width */ + if (**string == **pattern) + result = 0; + else if (nocase && (isupper((unsigned char)**string) || isupper((unsigned char)**pattern)) + && (tolower((unsigned char)**string) == tolower((unsigned char)**pattern))) + result = 0; + + /* Refuse to advance over trailing slash or nulls + */ + if (!**string || !**pattern || (slash && ((**string == '/') || (**pattern == '/')))) + return result; + +fnmatch_ch_success: + ++*pattern; + ++*string; + return result; +} + +int sudo_fnmatch(const char *pattern, const char *string, int flags) +{ + static const char dummystring[2] = {' ', 0}; + const int escape = !(flags & FNM_NOESCAPE); + const int slash = !!(flags & FNM_PATHNAME); + const int leading_dir = !!(flags & FNM_LEADING_DIR); + const char *strendseg; + const char *dummyptr; + const char *matchptr; + int wild; + /* For '*' wild processing only; surpress 'used before initialization' + * warnings with dummy initialization values; + */ + const char *strstartseg = NULL; + const char *mismatch = NULL; + int matchlen = 0; + + if (*pattern == '*') + goto firstsegment; + + while (*pattern && *string) + { + /* Pre-decode "\/" which has no special significance, and + * match balanced slashes, starting a new segment pattern + */ + if (slash && escape && (*pattern == '\\') && (pattern[1] == '/')) + ++pattern; + if (slash && (*pattern == '/') && (*string == '/')) { + ++pattern; + ++string; + } + +firstsegment: + /* At the beginning of each segment, validate leading period behavior. + */ + if ((flags & FNM_PERIOD) && (*string == '.')) + { + if (*pattern == '.') + ++pattern; + else if (escape && (*pattern == '\\') && (pattern[1] == '.')) + pattern += 2; + else + return FNM_NOMATCH; + ++string; + } + + /* Determine the end of string segment + * + * Presumes '/' character is unique, not composite in any MBCS encoding + */ + if (slash) { + strendseg = strchr(string, '/'); + if (!strendseg) + strendseg = strchr(string, '\0'); + } + else { + strendseg = strchr(string, '\0'); + } + + /* Allow pattern '*' to be consumed even with no remaining string to match + */ + while (*pattern) + { + if ((string > strendseg) + || ((string == strendseg) && (*pattern != '*'))) + break; + + if (slash && ((*pattern == '/') + || (escape && (*pattern == '\\') + && (pattern[1] == '/')))) + break; + + /* Reduce groups of '*' and '?' to n '?' matches + * followed by one '*' test for simplicity + */ + for (wild = 0; ((*pattern == '*') || (*pattern == '?')); ++pattern) + { + if (*pattern == '*') { + wild = 1; + } + else if (string < strendseg) { /* && (*pattern == '?') */ + /* XXX: Advance 1 char for MBCS locale */ + ++string; + } + else { /* (string >= strendseg) && (*pattern == '?') */ + return FNM_NOMATCH; + } + } + + if (wild) + { + strstartseg = string; + mismatch = pattern; + + /* Count fixed (non '*') char matches remaining in pattern + * excluding '/' (or "\/") and '*' + */ + for (matchptr = pattern, matchlen = 0; 1; ++matchlen) + { + if ((*matchptr == '\0') + || (slash && ((*matchptr == '/') + || (escape && (*matchptr == '\\') + && (matchptr[1] == '/'))))) + { + /* Compare precisely this many trailing string chars, + * the resulting match needs no wildcard loop + */ + /* XXX: Adjust for MBCS */ + if (string + matchlen > strendseg) + return FNM_NOMATCH; + + string = strendseg - matchlen; + wild = 0; + break; + } + + if (*matchptr == '*') + { + /* Ensure at least this many trailing string chars remain + * for the first comparison + */ + /* XXX: Adjust for MBCS */ + if (string + matchlen > strendseg) + return FNM_NOMATCH; + + /* Begin first wild comparison at the current position */ + break; + } + + /* Skip forward in pattern by a single character match + * Use a dummy fnmatch_ch() test to count one "[range]" escape + */ + /* XXX: Adjust for MBCS */ + if (escape && (*matchptr == '\\') && matchptr[1]) { + matchptr += 2; + } + else if (*matchptr == '[') { + dummyptr = dummystring; + fnmatch_ch(&matchptr, &dummyptr, flags); + } + else { + ++matchptr; + } + } + } + + /* Incrementally match string against the pattern + */ + while (*pattern && (string < strendseg)) + { + /* Success; begin a new wild pattern search + */ + if (*pattern == '*') + break; + + if (slash && ((*string == '/') + || (*pattern == '/') + || (escape && (*pattern == '\\') + && (pattern[1] == '/')))) + break; + + /* Compare ch's (the pattern is advanced over "\/" to the '/', + * but slashes will mismatch, and are not consumed) + */ + if (!fnmatch_ch(&pattern, &string, flags)) + continue; + + /* Failed to match, loop against next char offset of string segment + * until not enough string chars remain to match the fixed pattern + */ + if (wild) { + /* XXX: Advance 1 char for MBCS locale */ + string = ++strstartseg; + if (string + matchlen > strendseg) + return FNM_NOMATCH; + + pattern = mismatch; + continue; + } + else + return FNM_NOMATCH; + } + } + + if (*string && !((slash || leading_dir) && (*string == '/'))) + return FNM_NOMATCH; + + if (*pattern && !(slash && ((*pattern == '/') + || (escape && (*pattern == '\\') + && (pattern[1] == '/'))))) + return FNM_NOMATCH; + + if (leading_dir && !*pattern && *string == '/') + return 0; + } + + /* Where both pattern and string are at EOS, declare success + */ + if (!*string && !*pattern) + return 0; + + /* pattern didn't match to the end of string */ + return FNM_NOMATCH; +} +#endif /* HAVE_FNMATCH */ |