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tsrm_virtual_cwd.c
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tsrm_virtual_cwd.c
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/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2009 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andi Gutmans <andi@zend.com> |
| Sascha Schumann <sascha@schumann.cx> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <stdio.h>
#include <limits.h>
#include <errno.h>
#include <stdlib.h>
#include <fcntl.h>
#include <time.h>
#include "tsrm_virtual_cwd.h"
#include "tsrm_strtok_r.h"
#ifdef TSRM_WIN32
#include <io.h>
#include "tsrm_win32.h"
# ifndef IO_REPARSE_TAG_SYMLINK
# define IO_REPARSE_TAG_SYMLINK 0xA000000C
# endif
#endif
#ifdef NETWARE
#include <fsio.h>
#endif
#ifndef HAVE_REALPATH
#define realpath(x,y) strcpy(y,x)
#endif
#define VIRTUAL_CWD_DEBUG 0
#include "TSRM.h"
/* Only need mutex for popen() in Windows and NetWare because it doesn't chdir() on UNIX */
#if (defined(TSRM_WIN32) || defined(NETWARE)) && defined(ZTS)
MUTEX_T cwd_mutex;
#endif
#ifdef ZTS
ts_rsrc_id cwd_globals_id;
#else
virtual_cwd_globals cwd_globals;
#endif
cwd_state main_cwd_state; /* True global */
#ifndef TSRM_WIN32
#include <unistd.h>
#else
#include <direct.h>
#endif
#ifndef S_ISDIR
#define S_ISDIR(mode) ((mode) & _S_IFDIR)
#endif
#ifndef S_ISREG
#define S_ISREG(mode) ((mode) & _S_IFREG)
#endif
#ifdef TSRM_WIN32
#include <tchar.h>
#define tsrm_strtok_r(a,b,c) _tcstok((a),(b))
#define TOKENIZER_STRING "/\\"
static int php_check_dots(const char *element, int n)
{
while (n-- > 0) if (element[n] != '.') break;
return (n != -1);
}
#define IS_DIRECTORY_UP(element, len) \
(len >= 2 && !php_check_dots(element, len))
#define IS_DIRECTORY_CURRENT(element, len) \
(len == 1 && element[0] == '.')
#elif defined(NETWARE)
/* NetWare has strtok() (in LibC) and allows both slashes in paths, like Windows --
but rest of the stuff is like Unix */
/* strtok() call in LibC is abending when used in a different address space -- hence using
PHP's version itself for now */
/*#define tsrm_strtok_r(a,b,c) strtok((a),(b))*/
#define TOKENIZER_STRING "/\\"
#else
#define TOKENIZER_STRING "/"
#endif
/* default macros */
#ifndef IS_DIRECTORY_UP
#define IS_DIRECTORY_UP(element, len) \
(len == 2 && element[0] == '.' && element[1] == '.')
#endif
#ifndef IS_DIRECTORY_CURRENT
#define IS_DIRECTORY_CURRENT(element, len) \
(len == 1 && element[0] == '.')
#endif
/* define this to check semantics */
#define IS_DIR_OK(s) (1)
#ifndef IS_DIR_OK
#define IS_DIR_OK(state) (php_is_dir_ok(state) == 0)
#endif
#define CWD_STATE_COPY(d, s) \
(d)->cwd_length = (s)->cwd_length; \
(d)->cwd = (char *) malloc((s)->cwd_length+1); \
memcpy((d)->cwd, (s)->cwd, (s)->cwd_length+1);
#define CWD_STATE_FREE(s) \
free((s)->cwd);
#ifdef TSRM_WIN32
#ifdef CTL_CODE
#undef CTL_CODE
#endif
#define CTL_CODE(DeviceType,Function,Method,Access) (((DeviceType) << 16) | ((Access) << 14) | ((Function) << 2) | (Method))
#define FILE_DEVICE_FILE_SYSTEM 0x00000009
#define METHOD_BUFFERED 0
#define FILE_ANY_ACCESS 0
#define FSCTL_GET_REPARSE_POINT CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 42, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define MAXIMUM_REPARSE_DATA_BUFFER_SIZE ( 16 * 1024 )
typedef struct {
unsigned long ReparseTag;
unsigned short ReparseDataLength;
unsigned short Reserved;
union {
struct {
unsigned short SubstituteNameOffset;
unsigned short SubstituteNameLength;
unsigned short PrintNameOffset;
unsigned short PrintNameLength;
unsigned long Flags;
wchar_t ReparseTarget[1];
} SymbolicLinkReparseBuffer;
struct {
unsigned short SubstituteNameOffset;
unsigned short SubstituteNameLength;
unsigned short PrintNameOffset;
unsigned short PrintNameLength;
wchar_t ReparseTarget[1];
} MountPointReparseBuffer;
struct {
unsigned char ReparseTarget[1];
} GenericReparseBuffer;
};
} REPARSE_DATA_BUFFER;
#define SECS_BETWEEN_EPOCHS (__int64)11644473600
#define SECS_TO_100NS (__int64)10000000
static inline time_t FileTimeToUnixTime(const FILETIME FileTime)
{
__int64 UnixTime;
long *nsec = NULL;
SYSTEMTIME SystemTime;
FileTimeToSystemTime(&FileTime, &SystemTime);
UnixTime = ((__int64)FileTime.dwHighDateTime << 32) +
FileTime.dwLowDateTime;
UnixTime -= (SECS_BETWEEN_EPOCHS * SECS_TO_100NS);
if (nsec) {
*nsec = (UnixTime % SECS_TO_100NS) * (__int64)100;
}
UnixTime /= SECS_TO_100NS; /* now convert to seconds */
if ((time_t)UnixTime != UnixTime) {
UnixTime = 0;
}
return (time_t)UnixTime;
}
CWD_API int php_sys_stat(const char *path, struct stat *buf) /* {{{ */
{
WIN32_FILE_ATTRIBUTE_DATA data;
__int64 t;
if (!GetFileAttributesEx(path, GetFileExInfoStandard, &data)) {
return stat(path, buf);
}
if (path[1] == ':') {
if (path[0] >= 'A' && path[0] <= 'Z') {
buf->st_dev = buf->st_rdev = path[0] - 'A';
} else {
buf->st_dev = buf->st_rdev = path[0] - 'a';
}
} else {
char cur_path[MAXPATHLEN+1];
DWORD len = sizeof(cur_path);
char *tmp = cur_path;
while(1) {
DWORD r = GetCurrentDirectory(len, tmp);
if (r < len) {
if (tmp[1] == ':') {
if (path[0] >= 'A' && path[0] <= 'Z') {
buf->st_dev = buf->st_rdev = path[0] - 'A';
} else {
buf->st_dev = buf->st_rdev = path[0] - 'a';
}
} else {
buf->st_dev = buf->st_rdev = -1;
}
break;
} else if (!r) {
buf->st_dev = buf->st_rdev = -1;
break;
} else {
len = r+1;
tmp = (char*)malloc(len);
}
}
if (tmp != cur_path) {
free(tmp);
}
}
buf->st_uid = buf->st_gid = buf->st_ino = 0;
buf->st_mode = (data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) ? (S_IFDIR|S_IEXEC|(S_IEXEC>>3)|(S_IEXEC>>6)) : S_IFREG;
buf->st_mode |= (data.dwFileAttributes & FILE_ATTRIBUTE_READONLY) ? (S_IREAD|(S_IREAD>>3)|(S_IREAD>>6)) : (S_IREAD|(S_IREAD>>3)|(S_IREAD>>6)|S_IWRITE|(S_IWRITE>>3)|(S_IWRITE>>6));
if ((data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) == 0) {
int len = strlen(path);
if (path[len-4] == '.') {
if (_memicmp(path+len-3, "exe", 3) == 0 ||
_memicmp(path+len-3, "com", 3) == 0 ||
_memicmp(path+len-3, "bat", 3) == 0 ||
_memicmp(path+len-3, "cmd", 3) == 0) {
buf->st_mode |= (S_IEXEC|(S_IEXEC>>3)|(S_IEXEC>>6));
}
}
}
buf->st_nlink = 1;
t = data.nFileSizeHigh;
t = t << 32;
t |= data.nFileSizeLow;
buf->st_size = t;
buf->st_atime = FileTimeToUnixTime(data.ftLastAccessTime);
buf->st_ctime = FileTimeToUnixTime(data.ftCreationTime);
buf->st_mtime = FileTimeToUnixTime(data.ftLastWriteTime);
if (buf->st_mtime != buf->st_atime) {
buf->st_atime = buf->st_mtime;
}
return 0;
}
/* }}} */
#endif
static int php_is_dir_ok(const cwd_state *state) /* {{{ */
{
struct stat buf;
if (php_sys_stat(state->cwd, &buf) == 0 && S_ISDIR(buf.st_mode))
return (0);
return (1);
}
/* }}} */
static int php_is_file_ok(const cwd_state *state) /* {{{ */
{
struct stat buf;
if (php_sys_stat(state->cwd, &buf) == 0 && S_ISREG(buf.st_mode))
return (0);
return (1);
}
/* }}} */
static void cwd_globals_ctor(virtual_cwd_globals *cwd_globals TSRMLS_DC) /* {{{ */
{
CWD_STATE_COPY(&cwd_globals->cwd, &main_cwd_state);
cwd_globals->realpath_cache_size = 0;
cwd_globals->realpath_cache_size_limit = REALPATH_CACHE_SIZE;
cwd_globals->realpath_cache_ttl = REALPATH_CACHE_TTL;
memset(cwd_globals->realpath_cache, 0, sizeof(cwd_globals->realpath_cache));
}
/* }}} */
static void cwd_globals_dtor(virtual_cwd_globals *cwd_globals TSRMLS_DC) /* {{{ */
{
CWD_STATE_FREE(&cwd_globals->cwd);
realpath_cache_clean(TSRMLS_C);
}
/* }}} */
CWD_API void virtual_cwd_startup(void) /* {{{ */
{
char cwd[MAXPATHLEN];
char *result;
#ifdef NETWARE
result = getcwdpath(cwd, NULL, 1);
if(result)
{
char *c=cwd;
while(c = strchr(c, '\\'))
{
*c='/';
++c;
}
}
#else
result = getcwd(cwd, sizeof(cwd));
#endif
if (!result) {
cwd[0] = '\0';
}
main_cwd_state.cwd_length = strlen(cwd);
#ifdef TSRM_WIN32
if (main_cwd_state.cwd_length >= 2 && cwd[1] == ':') {
cwd[0] = toupper(cwd[0]);
}
#endif
main_cwd_state.cwd = strdup(cwd);
#ifdef ZTS
ts_allocate_id(&cwd_globals_id, sizeof(virtual_cwd_globals), (ts_allocate_ctor) cwd_globals_ctor, (ts_allocate_dtor) cwd_globals_dtor);
#else
cwd_globals_ctor(&cwd_globals TSRMLS_CC);
#endif
#if (defined(TSRM_WIN32) || defined(NETWARE)) && defined(ZTS)
cwd_mutex = tsrm_mutex_alloc();
#endif
}
/* }}} */
CWD_API void virtual_cwd_shutdown(void) /* {{{ */
{
#ifndef ZTS
cwd_globals_dtor(&cwd_globals TSRMLS_CC);
#endif
#if (defined(TSRM_WIN32) || defined(NETWARE)) && defined(ZTS)
tsrm_mutex_free(cwd_mutex);
#endif
free(main_cwd_state.cwd); /* Don't use CWD_STATE_FREE because the non global states will probably use emalloc()/efree() */
}
/* }}} */
CWD_API char *virtual_getcwd_ex(size_t *length TSRMLS_DC) /* {{{ */
{
cwd_state *state;
state = &CWDG(cwd);
if (state->cwd_length == 0) {
char *retval;
*length = 1;
retval = (char *) malloc(2);
retval[0] = DEFAULT_SLASH;
retval[1] = '\0';
return retval;
}
#ifdef TSRM_WIN32
/* If we have something like C: */
if (state->cwd_length == 2 && state->cwd[state->cwd_length-1] == ':') {
char *retval;
*length = state->cwd_length+1;
retval = (char *) malloc(*length+1);
memcpy(retval, state->cwd, *length);
retval[0] = toupper(retval[0]);
retval[*length-1] = DEFAULT_SLASH;
retval[*length] = '\0';
return retval;
}
#endif
*length = state->cwd_length;
return strdup(state->cwd);
}
/* }}} */
/* Same semantics as UNIX getcwd() */
CWD_API char *virtual_getcwd(char *buf, size_t size TSRMLS_DC) /* {{{ */
{
size_t length;
char *cwd;
cwd = virtual_getcwd_ex(&length TSRMLS_CC);
if (buf == NULL) {
return cwd;
}
if (length > size-1) {
free(cwd);
errno = ERANGE; /* Is this OK? */
return NULL;
}
memcpy(buf, cwd, length+1);
free(cwd);
return buf;
}
/* }}} */
static inline unsigned long realpath_cache_key(const char *path, int path_len) /* {{{ */
{
register unsigned long h;
const char *e = path + path_len;
for (h = 2166136261U; path < e;) {
h *= 16777619;
h ^= *path++;
}
return h;
}
/* }}} */
CWD_API void realpath_cache_clean(TSRMLS_D) /* {{{ */
{
int i;
for (i = 0; i < sizeof(CWDG(realpath_cache))/sizeof(CWDG(realpath_cache)[0]); i++) {
realpath_cache_bucket *p = CWDG(realpath_cache)[i];
while (p != NULL) {
realpath_cache_bucket *r = p;
p = p->next;
free(r);
}
CWDG(realpath_cache)[i] = NULL;
}
CWDG(realpath_cache_size) = 0;
}
/* }}} */
CWD_API void realpath_cache_del(const char *path, int path_len TSRMLS_DC) /* {{{ */
{
unsigned long key = realpath_cache_key(path, path_len);
unsigned long n = key % (sizeof(CWDG(realpath_cache)) / sizeof(CWDG(realpath_cache)[0]));
realpath_cache_bucket **bucket = &CWDG(realpath_cache)[n];
while (*bucket != NULL) {
if (key == (*bucket)->key && path_len == (*bucket)->path_len &&
memcmp(path, (*bucket)->path, path_len) == 0) {
realpath_cache_bucket *r = *bucket;
*bucket = (*bucket)->next;
CWDG(realpath_cache_size) -= sizeof(realpath_cache_bucket) + r->path_len + 1 + r->realpath_len + 1;
free(r);
return;
} else {
bucket = &(*bucket)->next;
}
}
}
/* }}} */
static inline void realpath_cache_add(const char *path, int path_len, const char *realpath, int realpath_len, int is_dir, time_t t TSRMLS_DC) /* {{{ */
{
long size = sizeof(realpath_cache_bucket) + path_len + 1;
int same = 1;
if (realpath_len != path_len ||
memcmp(path, realpath, path_len) != 0) {
size += realpath_len + 1;
same = 0;
}
if (CWDG(realpath_cache_size) + size <= CWDG(realpath_cache_size_limit)) {
realpath_cache_bucket *bucket = malloc(size);
unsigned long n;
bucket->key = realpath_cache_key(path, path_len);
bucket->path = (char*)bucket + sizeof(realpath_cache_bucket);
memcpy(bucket->path, path, path_len+1);
bucket->path_len = path_len;
if (same) {
bucket->realpath = bucket->path;
} else {
bucket->realpath = bucket->path + (path_len + 1);
memcpy(bucket->realpath, realpath, realpath_len+1);
}
bucket->realpath_len = realpath_len;
bucket->is_dir = is_dir;
#ifdef PHP_WIN32
bucket->is_rvalid = 0;
bucket->is_readable = 0;
bucket->is_wvalid = 0;
bucket->is_writable = 0;
#endif
bucket->expires = t + CWDG(realpath_cache_ttl);
n = bucket->key % (sizeof(CWDG(realpath_cache)) / sizeof(CWDG(realpath_cache)[0]));
bucket->next = CWDG(realpath_cache)[n];
CWDG(realpath_cache)[n] = bucket;
CWDG(realpath_cache_size) += size;
}
}
/* }}} */
static inline realpath_cache_bucket* realpath_cache_find(const char *path, int path_len, time_t t TSRMLS_DC) /* {{{ */
{
unsigned long key = realpath_cache_key(path, path_len);
unsigned long n = key % (sizeof(CWDG(realpath_cache)) / sizeof(CWDG(realpath_cache)[0]));
realpath_cache_bucket **bucket = &CWDG(realpath_cache)[n];
while (*bucket != NULL) {
if (CWDG(realpath_cache_ttl) && (*bucket)->expires < t) {
realpath_cache_bucket *r = *bucket;
*bucket = (*bucket)->next;
CWDG(realpath_cache_size) -= sizeof(realpath_cache_bucket) + r->path_len + 1 + r->realpath_len + 1;
free(r);
} else if (key == (*bucket)->key && path_len == (*bucket)->path_len &&
memcmp(path, (*bucket)->path, path_len) == 0) {
return *bucket;
} else {
bucket = &(*bucket)->next;
}
}
return NULL;
}
/* }}} */
CWD_API realpath_cache_bucket* realpath_cache_lookup(const char *path, int path_len, time_t t TSRMLS_DC) /* {{{ */
{
return realpath_cache_find(path, path_len, t TSRMLS_CC);
}
/* }}} */
#undef LINK_MAX
#define LINK_MAX 32
static int tsrm_realpath_r(char *path, int start, int len, int *ll, time_t *t, int use_realpath, int is_dir, int *link_is_dir TSRMLS_DC) /* {{{ */
{
int i, j, save;
int directory = 0;
#ifdef TSRM_WIN32
WIN32_FIND_DATA data;
HANDLE hFind;
#else
struct stat st;
#endif
realpath_cache_bucket *bucket;
char *tmp;
TSRM_ALLOCA_FLAG(use_heap)
TSRM_ALLOCA_FLAG(use_heap_large)
while (1) {
if (len <= start) {
return start;
}
i = len;
while (i > start && !IS_SLASH(path[i-1])) {
i--;
}
if (i == len ||
(i == len - 1 && path[i] == '.')) {
/* remove double slashes and '.' */
len = i - 1;
is_dir = 1;
continue;
} else if (i == len - 2 && path[i] == '.' && path[i+1] == '.') {
/* remove '..' and previous directory */
if (i - 1 <= start) {
return start ? start : len;
}
j = tsrm_realpath_r(path, start, i-1, ll, t, use_realpath, 1, NULL TSRMLS_CC);
if (j > start) {
j--;
while (j > start && !IS_SLASH(path[j])) {
j--;
}
if (!start) {
/* leading '..' must not be removed in case of relative path */
if (j == 0 && path[0] == '.' && path[1] == '.' &&
IS_SLASH(path[2])) {
path[3] = '.';
path[4] = '.';
path[5] = DEFAULT_SLASH;
j = 5;
} else if (j > 0 &&
path[j+1] == '.' && path[j+2] == '.' &&
IS_SLASH(path[j+3])) {
j += 4;
path[j++] = '.';
path[j++] = '.';
path[j] = DEFAULT_SLASH;
}
}
} else if (!start && !j) {
/* leading '..' must not be removed in case of relative path */
path[0] = '.';
path[1] = '.';
path[2] = DEFAULT_SLASH;
j = 2;
}
return j;
}
path[len] = 0;
save = (use_realpath != CWD_EXPAND);
if (start && save && CWDG(realpath_cache_size_limit)) {
/* cache lookup for absolute path */
if (!*t) {
*t = time(0);
}
if ((bucket = realpath_cache_find(path, len, *t TSRMLS_CC)) != NULL) {
if (is_dir && !bucket->is_dir) {
/* not a directory */
return -1;
} else {
if (link_is_dir) {
*link_is_dir = bucket->is_dir;
}
memcpy(path, bucket->realpath, bucket->realpath_len + 1);
return bucket->realpath_len;
}
}
}
#ifdef TSRM_WIN32
if (save && (hFind = FindFirstFile(path, &data)) == INVALID_HANDLE_VALUE) {
if (use_realpath == CWD_REALPATH) {
/* file not found */
return -1;
}
/* continue resolution anyway but don't save result in the cache */
save = 0;
}
if (save) {
FindClose(hFind);
}
tmp = tsrm_do_alloca(len+1, use_heap);
memcpy(tmp, path, len+1);
if(save && (data.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT)) {
/* File is a reparse point. Get the target */
HANDLE hLink = NULL;
REPARSE_DATA_BUFFER * pbuffer;
unsigned int retlength = 0, rname_off = 0;
int bufindex = 0, rname_len = 0, isabsolute = 0;
wchar_t * reparsetarget;
if(++(*ll) > LINK_MAX) {
return -1;
}
hLink = CreateFile(path, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_FLAG_OPEN_REPARSE_POINT|FILE_FLAG_BACKUP_SEMANTICS, NULL);
if(hLink == INVALID_HANDLE_VALUE) {
return -1;
}
pbuffer = (REPARSE_DATA_BUFFER *)tsrm_do_alloca(MAXIMUM_REPARSE_DATA_BUFFER_SIZE, use_heap_large);
if(!DeviceIoControl(hLink, FSCTL_GET_REPARSE_POINT, NULL, 0, pbuffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE, &retlength, NULL)) {
tsrm_free_alloca(pbuffer, use_heap_large);
CloseHandle(hLink);
return -1;
}
CloseHandle(hLink);
if(pbuffer->ReparseTag == IO_REPARSE_TAG_SYMLINK) {
rname_len = pbuffer->SymbolicLinkReparseBuffer.PrintNameLength/2;
rname_off = pbuffer->SymbolicLinkReparseBuffer.PrintNameOffset/2;
reparsetarget = pbuffer->SymbolicLinkReparseBuffer.ReparseTarget;
isabsolute = (pbuffer->SymbolicLinkReparseBuffer.Flags == 0) ? 1 : 0;
}
else if(pbuffer->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT) {
rname_len = pbuffer->MountPointReparseBuffer.PrintNameLength/2;
rname_off = pbuffer->MountPointReparseBuffer.PrintNameOffset/2;
reparsetarget = pbuffer->MountPointReparseBuffer.ReparseTarget;
isabsolute = 1;
}
else {
tsrm_free_alloca(pbuffer, use_heap_large);
return -1;
}
/* Convert wide string to narrow string */
for(bufindex = 0; bufindex < rname_len; bufindex++) {
*(path + bufindex) = (char)(reparsetarget[rname_off + bufindex]);
}
*(path + bufindex) = 0;
tsrm_free_alloca(pbuffer, use_heap_large);
j = bufindex;
if(isabsolute == 1) {
/* use_realpath is 0 in the call below coz path is absolute*/
j = tsrm_realpath_r(path, 0, j, ll, t, 0, is_dir, &directory TSRMLS_CC);
if(j < 0) {
tsrm_free_alloca(tmp, use_heap);
return -1;
}
}
else {
if(i + j >= MAXPATHLEN - 1) {
tsrm_free_alloca(tmp, use_heap);
return -1;
}
memmove(path+i, path, j+1);
memcpy(path, tmp, i-1);
path[i-1] = DEFAULT_SLASH;
j = tsrm_realpath_r(path, start, i + j, ll, t, use_realpath, is_dir, &directory TSRMLS_CC);
if(j < 0) {
tsrm_free_alloca(tmp, use_heap);
return -1;
}
}
if(link_is_dir) {
*link_is_dir = directory;
}
}
else {
if (save) {
directory = (data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0;
if (is_dir && !directory) {
/* not a directory */
return -1;
}
}
#elif defined(NETWARE)
save = 0;
tmp = tsrm_do_alloca(len+1, use_heap);
memcpy(tmp, path, len+1);
#else
if (save && lstat(path, &st) < 0) {
if (use_realpath == CWD_REALPATH) {
/* file not found */
return -1;
}
/* continue resolution anyway but don't save result in the cache */
save = 0;
}
tmp = tsrm_do_alloca(len+1, use_heap);
memcpy(tmp, path, len+1);
if (save && S_ISLNK(st.st_mode)) {
if (++(*ll) > LINK_MAX || (j = readlink(tmp, path, MAXPATHLEN)) < 0) {
/* too many links or broken symlinks */
tsrm_free_alloca(tmp, use_heap);
return -1;
}
path[j] = 0;
if (IS_ABSOLUTE_PATH(path, j)) {
j = tsrm_realpath_r(path, 1, j, ll, t, use_realpath, is_dir, &directory TSRMLS_CC);
if (j < 0) {
tsrm_free_alloca(tmp, use_heap);
return -1;
}
} else {
if (i + j >= MAXPATHLEN-1) {
tsrm_free_alloca(tmp, use_heap);
return -1; /* buffer overflow */
}
memmove(path+i, path, j+1);
memcpy(path, tmp, i-1);
path[i-1] = DEFAULT_SLASH;
j = tsrm_realpath_r(path, start, i + j, ll, t, use_realpath, is_dir, &directory TSRMLS_CC);
if (j < 0) {
tsrm_free_alloca(tmp, use_heap);
return -1;
}
}
if (link_is_dir) {
*link_is_dir = directory;
}
} else {
if (save) {
directory = S_ISDIR(st.st_mode);
if (link_is_dir) {
*link_is_dir = directory;
}
if (is_dir && !directory) {
/* not a directory */
return -1;
}
}
#endif
if (i - 1 <= start) {
j = start;
} else {
/* some leading directories may be unaccessable */
j = tsrm_realpath_r(path, start, i-1, ll, t, save ? CWD_FILEPATH : use_realpath, 1, NULL TSRMLS_CC);
if (j > start) {
path[j++] = DEFAULT_SLASH;
}
}
#ifdef TSRM_WIN32
if (j < 0 || j + len - i >= MAXPATHLEN-1) {
tsrm_free_alloca(tmp, use_heap);
return -1;
}
if (save) {
i = strlen(data.cFileName);
memcpy(path+j, data.cFileName, i+1);
j += i;
} else {
/* use the original file or directory name as it wasn't found */
memcpy(path+j, tmp+i, len-i+1);
j += (len-i);
}
}
#else
if (j < 0 || j + len - i >= MAXPATHLEN-1) {
tsrm_free_alloca(tmp, use_heap);
return -1;
}
memcpy(path+j, tmp+i, len-i+1);
j += (len-i);
}
#endif
if (save && start && CWDG(realpath_cache_size_limit)) {
/* save absolute path in the cache */
realpath_cache_add(tmp, len, path, j, directory, *t TSRMLS_CC);
}
tsrm_free_alloca(tmp, use_heap);
return j;
}
}
/* }}} */
/* Resolve path relatively to state and put the real path into state */
/* returns 0 for ok, 1 for error */
CWD_API int virtual_file_ex(cwd_state *state, const char *path, verify_path_func verify_path, int use_realpath) /* {{{ */
{
int path_length = strlen(path);
char resolved_path[MAXPATHLEN];
int start = 1;
int ll = 0;
time_t t;
int ret;
int add_slash;
TSRMLS_FETCH();
if (path_length == 0 || path_length >= MAXPATHLEN-1) {
return 1;
}
#if VIRTUAL_CWD_DEBUG
fprintf(stderr,"cwd = %s path = %s\n", state->cwd, path);
#endif
/* cwd_length can be 0 when getcwd() fails.
* This can happen under solaris when a dir does not have read permissions
* but *does* have execute permissions */
if (!IS_ABSOLUTE_PATH(path, path_length)) {
if (state->cwd_length == 0) {
/* resolve relative path */
start = 0;
memcpy(resolved_path , path, path_length + 1);
} else {
int state_cwd_length = state->cwd_length;
#ifdef TSRM_WIN32
if (IS_SLASH(path[0])) {
if (state->cwd[1] == ':') {
/* Copy only the drive name */
state_cwd_length = 2;
} else if (IS_UNC_PATH(state->cwd, state->cwd_length)) {
/* Copy only the share name */
state_cwd_length = 2;
while (IS_SLASH(state->cwd[state_cwd_length])) {
state_cwd_length++;
}
while (state->cwd[state_cwd_length] &&
!IS_SLASH(state->cwd[state_cwd_length])) {
state_cwd_length++;
}
while (IS_SLASH(state->cwd[state_cwd_length])) {
state_cwd_length++;
}
while (state->cwd[state_cwd_length] &&
!IS_SLASH(state->cwd[state_cwd_length])) {
state_cwd_length++;
}
}
}
#endif
if (path_length + state_cwd_length + 1 >= MAXPATHLEN-1) {
return 1;
}
memcpy(resolved_path, state->cwd, state_cwd_length);
resolved_path[state_cwd_length] = DEFAULT_SLASH;
memcpy(resolved_path + state_cwd_length + 1, path, path_length + 1);
path_length += state_cwd_length + 1;
}
} else {
#ifdef TSRM_WIN32
if (path_length > 2 && path[1] == ':' && !IS_SLASH(path[2])) {
resolved_path[0] = path[0];
resolved_path[1] = ':';
resolved_path[2] = DEFAULT_SLASH;
memcpy(resolved_path + 3, path + 2, path_length - 1);
path_length++;
} else
#endif
memcpy(resolved_path, path, path_length + 1);
}
#ifdef TSRM_WIN32
if (memchr(resolved_path, '*', path_length) ||
memchr(resolved_path, '?', path_length)) {
return 1;
}
#endif
#ifdef TSRM_WIN32
if (IS_UNC_PATH(resolved_path, path_length)) {
/* skip UNC name */
resolved_path[0] = DEFAULT_SLASH;
resolved_path[1] = DEFAULT_SLASH;
start = 2;
while (!IS_SLASH(resolved_path[start])) {
if (resolved_path[start] == 0) {
goto verify;
}
resolved_path[start] = toupper(resolved_path[start]);
start++;
}
resolved_path[start++] = DEFAULT_SLASH;
while (!IS_SLASH(resolved_path[start])) {
if (resolved_path[start] == 0) {
goto verify;
}
resolved_path[start] = toupper(resolved_path[start]);
start++;
}
resolved_path[start++] = DEFAULT_SLASH;
} else if (IS_ABSOLUTE_PATH(resolved_path, path_length)) {
/* skip DRIVE name */
resolved_path[0] = toupper(resolved_path[0]);
resolved_path[2] = DEFAULT_SLASH;
start = 3;
}
#elif defined(NETWARE)
if (IS_ABSOLUTE_PATH(resolved_path, path_length)) {
/* skip VOLUME name */
start = 0;
while (start != ':') {
if (resolved_path[start] == 0) return -1;
start++;
}
start++;
if (!IS_SLASH(resolved_path[start])) return -1;
resolved_path[start++] = DEFAULT_SLASH;
}
#endif
add_slash = (use_realpath != CWD_REALPATH) && path_length > 0 && IS_SLASH(resolved_path[path_length-1]);
t = CWDG(realpath_cache_ttl) ? 0 : -1;
path_length = tsrm_realpath_r(resolved_path, start, path_length, &ll, &t, use_realpath, 0, NULL TSRMLS_CC);
if (path_length < 0) {
errno = ENOENT;
return 1;
}
if (!start && !path_length) {
resolved_path[path_length++] = '.';
}