php-src/TSRM/tsrm_virtual_cwd.c
2001-01-21 17:35:31 +00:00

788 lines
16 KiB
C

/*
+----------------------------------------------------------------------+
| PHP version 4.0 |
+----------------------------------------------------------------------+
| Copyright (c) 1997, 1998, 1999, 2000 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 2.02 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available at through the world-wide-web at |
| http://www.php.net/license/2_02.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 "tsrm_virtual_cwd.h"
#include "tsrm_strtok_r.h"
#ifdef TSRM_WIN32
#include <io.h>
#endif
#define VIRTUAL_CWD_DEBUG 0
#ifdef ZTS
#include "TSRM.h"
#endif
/* Only need mutex for popen() in Windows because it doesn't chdir() on UNIX */
#if defined(TSRM_WIN32) && defined(ZTS)
MUTEX_T cwd_mutex;
#endif
#ifdef ZTS
static ts_rsrc_id cwd_globals_id;
#else
static 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
#define tsrm_strtok_r(a,b,c) strtok((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 && ptr[0] == '.')
#else
#define TOKENIZER_STRING "/"
#endif
/* default macros */
#ifndef IS_DIRECTORY_UP
#define IS_DIRECTORY_UP(element, len) \
(len == 2 && memcmp(element, "..", 2) == 0)
#endif
#ifndef IS_DIRECTORY_CURRENT
#define IS_DIRECTORY_CURRENT(element, len) \
(len == 1 && ptr[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);
static int php_is_dir_ok(const cwd_state *state)
{
struct stat buf;
if (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 (stat(state->cwd, &buf) == 0 && S_ISREG(buf.st_mode))
return (0);
return (1);
}
static void cwd_globals_ctor(virtual_cwd_globals *cwd_globals)
{
CWD_STATE_COPY(&cwd_globals->cwd, &main_cwd_state);
}
static void cwd_globals_dtor(virtual_cwd_globals *cwd_globals)
{
CWD_STATE_FREE(&cwd_globals->cwd);
}
static char *tsrm_strndup(const char *s, size_t length)
{
char *p;
p = (char *) malloc(length+1);
if (!p) {
return (char *)NULL;
}
if (length) {
memcpy(p,s,length);
}
p[length]=0;
return p;
}
CWD_API void virtual_cwd_startup(void)
{
char cwd[MAXPATHLEN];
char *result;
result = getcwd(cwd, sizeof(cwd));
if (!result) {
cwd[0] = '\0';
}
main_cwd_state.cwd = strdup(cwd);
main_cwd_state.cwd_length = strlen(cwd);
#ifdef ZTS
cwd_globals_id = ts_allocate_id(sizeof(virtual_cwd_globals), (ts_allocate_ctor) cwd_globals_ctor, (ts_allocate_dtor) cwd_globals_dtor);
#else
cwd_globals_ctor(&cwd_globals);
#endif
#if defined(TSRM_WIN32) && defined(ZTS)
cwd_mutex = tsrm_mutex_alloc();
#endif
}
CWD_API void virtual_cwd_shutdown(void)
{
#ifndef ZTS
cwd_globals_dtor(&cwd_globals);
#endif
#if defined(TSRM_WIN32) && 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)
{
cwd_state *state;
CWDLS_FETCH();
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[*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)
{
size_t length;
char *cwd;
cwd = virtual_getcwd_ex(&length);
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;
}
/* 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 path_length = strlen(path);
char *ptr, *path_copy;
char *tok = NULL;
int ptr_length;
cwd_state *old_state;
int ret = 0;
int copy_amount = -1;
char *free_path;
unsigned char is_absolute = 0;
#ifndef TSRM_WIN32
char resolved_path[MAXPATHLEN];
#endif
if (path_length == 0)
return (0);
#if !defined(TSRM_WIN32) && !defined(__BEOS__)
if (IS_ABSOLUTE_PATH(path, path_length)) {
if (realpath(path, resolved_path)) {
path = resolved_path;
path_length = strlen(path);
}
} else { /* Concat current directory with relative path and then run realpath() on it */
char *tmp;
char *ptr;
ptr = tmp = (char *) malloc(state->cwd_length+path_length+sizeof("/"));
if (!tmp) {
return 1;
}
memcpy(ptr, state->cwd, state->cwd_length);
ptr += state->cwd_length;
*ptr++ = DEFAULT_SLASH;
memcpy(ptr, path, path_length);
ptr += path_length;
*ptr = '\0';
if (realpath(tmp, resolved_path)) {
path = resolved_path;
path_length = strlen(path);
}
free(tmp);
}
#endif
free_path = path_copy = tsrm_strndup(path, path_length);
old_state = (cwd_state *) malloc(sizeof(cwd_state));
CWD_STATE_COPY(old_state, state);
#if VIRTUAL_CWD_DEBUG
fprintf(stderr,"cwd = %s path = %s\n", state->cwd, path);
#endif
if (IS_ABSOLUTE_PATH(path_copy, path_length)) {
copy_amount = COPY_WHEN_ABSOLUTE;
is_absolute = 1;
#ifdef TSRM_WIN32
} else if(IS_SLASH(path_copy[0])) {
copy_amount = 2;
#endif
}
if (copy_amount != -1) {
state->cwd = (char *) realloc(state->cwd, copy_amount + 1);
if (copy_amount) {
if (is_absolute) {
memcpy(state->cwd, path_copy, copy_amount);
path_copy += copy_amount;
} else {
memcpy(state->cwd, old_state->cwd, copy_amount);
}
}
state->cwd[copy_amount] = '\0';
state->cwd_length = copy_amount;
}
ptr = tsrm_strtok_r(path_copy, TOKENIZER_STRING, &tok);
while (ptr) {
ptr_length = strlen(ptr);
if (IS_DIRECTORY_UP(ptr, ptr_length)) {
char save;
save = DEFAULT_SLASH;
#define PREVIOUS state->cwd[state->cwd_length - 1]
while (IS_ABSOLUTE_PATH(state->cwd, state->cwd_length) &&
!IS_SLASH(PREVIOUS)) {
save = PREVIOUS;
PREVIOUS = '\0';
state->cwd_length--;
}
if (!IS_ABSOLUTE_PATH(state->cwd, state->cwd_length)) {
state->cwd[state->cwd_length++] = save;
state->cwd[state->cwd_length] = '\0';
} else {
PREVIOUS = '\0';
state->cwd_length--;
}
} else if (!IS_DIRECTORY_CURRENT(ptr, ptr_length)) {
state->cwd = (char *) realloc(state->cwd, state->cwd_length+ptr_length+1+1);
state->cwd[state->cwd_length] = DEFAULT_SLASH;
memcpy(&state->cwd[state->cwd_length+1], ptr, ptr_length+1);
state->cwd_length += (ptr_length+1);
}
ptr = tsrm_strtok_r(NULL, TOKENIZER_STRING, &tok);
}
if (state->cwd_length == COPY_WHEN_ABSOLUTE) {
state->cwd = (char *) realloc(state->cwd, state->cwd_length+1+1);
state->cwd[state->cwd_length] = DEFAULT_SLASH;
state->cwd[state->cwd_length+1] = '\0';
state->cwd_length++;
}
if (verify_path && verify_path(state)) {
CWD_STATE_FREE(state);
*state = *old_state;
ret = 1;
} else {
CWD_STATE_FREE(old_state);
ret = 0;
}
free(old_state);
free(free_path);
#if VIRTUAL_CWD_DEBUG
fprintf (stderr, "virtual_file_ex() = %s\n",state->cwd);
#endif
return (ret);
}
CWD_API int virtual_chdir(const char *path)
{
CWDLS_FETCH();
return virtual_file_ex(&CWDG(cwd), path, php_is_dir_ok)?-1:0;
}
CWD_API int virtual_chdir_file(const char *path, int (*p_chdir)(const char *path))
{
int length = strlen(path);
char *temp;
int retval;
if (length == 0) {
return 1; /* Can't cd to empty string */
}
while(--length >= 0 && !IS_SLASH(path[length])) {
}
if (length == -1) {
/* No directory only file name */
errno = ENOENT;
return -1;
}
if (length == COPY_WHEN_ABSOLUTE && IS_ABSOLUTE_PATH(path, length+1)) { /* Also use trailing slash if this is absolute */
length++;
}
temp = (char *) tsrm_do_alloca(length+1);
memcpy(temp, path, length);
temp[length] = 0;
#if VIRTUAL_CWD_DEBUG
fprintf (stderr, "Changing directory to %s\n", temp);
#endif
retval = p_chdir(temp);
tsrm_free_alloca(temp);
return retval;
}
CWD_API char *virtual_realpath(const char *path, char *real_path)
{
cwd_state new_state;
int retval;
CWDLS_FETCH();
CWD_STATE_COPY(&new_state, &CWDG(cwd));
retval = virtual_file_ex(&new_state, path, NULL);
if (!retval) {
int len = new_state.cwd_length>MAXPATHLEN-1?MAXPATHLEN-1:new_state.cwd_length;
memcpy(real_path, new_state.cwd, len);
real_path[len] = '\0';
return real_path;
}
return NULL;
}
CWD_API int virtual_filepath_ex(const char *path, char **filepath, verify_path_func verify_path)
{
cwd_state new_state;
int retval;
CWDLS_FETCH();
CWD_STATE_COPY(&new_state, &CWDG(cwd));
retval = virtual_file_ex(&new_state, path, verify_path);
*filepath = new_state.cwd;
return retval;
}
CWD_API int virtual_filepath(const char *path, char **filepath)
{
return virtual_filepath_ex(path, filepath, php_is_file_ok);
}
CWD_API FILE *virtual_fopen(const char *path, const char *mode)
{
cwd_state new_state;
FILE *f;
CWDLS_FETCH();
if (path[0] == '\0') { /* Fail to open empty path */
return NULL;
}
CWD_STATE_COPY(&new_state, &CWDG(cwd));
virtual_file_ex(&new_state, path, NULL);
f = fopen(new_state.cwd, mode);
CWD_STATE_FREE(&new_state);
return f;
}
#if HAVE_UTIME
CWD_API int virtual_utime(const char *filename, struct utimbuf *buf)
{
cwd_state new_state;
int ret;
CWDLS_FETCH();
CWD_STATE_COPY(&new_state, &CWDG(cwd));
virtual_file_ex(&new_state, filename, NULL);
ret = utime(new_state.cwd, buf);
CWD_STATE_FREE(&new_state);
return ret;
}
#endif
CWD_API int virtual_chmod(const char *filename, mode_t mode)
{
cwd_state new_state;
int ret;
CWDLS_FETCH();
CWD_STATE_COPY(&new_state, &CWDG(cwd));
virtual_file_ex(&new_state, filename, NULL);
ret = chmod(new_state.cwd, mode);
CWD_STATE_FREE(&new_state);
return ret;
}
#ifndef TSRM_WIN32
CWD_API int virtual_chown(const char *filename, uid_t owner, gid_t group)
{
cwd_state new_state;
int ret;
CWDLS_FETCH();
CWD_STATE_COPY(&new_state, &CWDG(cwd));
virtual_file_ex(&new_state, filename, NULL);
ret = chown(new_state.cwd, owner, group);
CWD_STATE_FREE(&new_state);
return ret;
}
#endif
CWD_API int virtual_open(const char *path, int flags, ...)
{
cwd_state new_state;
int f;
CWDLS_FETCH();
CWD_STATE_COPY(&new_state, &CWDG(cwd));
virtual_file_ex(&new_state, path, NULL);
if (flags & O_CREAT) {
mode_t mode;
va_list arg;
va_start(arg, flags);
mode = va_arg(arg, mode_t);
va_end(arg);
f = open(new_state.cwd, flags, mode);
} else {
f = open(new_state.cwd, flags);
}
CWD_STATE_FREE(&new_state);
return f;
}
CWD_API int virtual_creat(const char *path, mode_t mode)
{
cwd_state new_state;
int f;
CWDLS_FETCH();
CWD_STATE_COPY(&new_state, &CWDG(cwd));
virtual_file_ex(&new_state, path, NULL);
f = creat(new_state.cwd, mode);
CWD_STATE_FREE(&new_state);
return f;
}
CWD_API int virtual_rename(char *oldname, char *newname)
{
cwd_state old_state;
cwd_state new_state;
int retval;
CWDLS_FETCH();
CWD_STATE_COPY(&old_state, &CWDG(cwd));
virtual_file_ex(&old_state, oldname, NULL);
oldname = old_state.cwd;
CWD_STATE_COPY(&new_state, &CWDG(cwd));
virtual_file_ex(&new_state, newname, NULL);
newname = new_state.cwd;
retval = rename(oldname, newname);
CWD_STATE_FREE(&old_state);
CWD_STATE_FREE(&new_state);
return retval;
}
CWD_API int virtual_stat(const char *path, struct stat *buf)
{
cwd_state new_state;
int retval;
CWDLS_FETCH();
CWD_STATE_COPY(&new_state, &CWDG(cwd));
virtual_file_ex(&new_state, path, NULL);
retval = stat(new_state.cwd, buf);
CWD_STATE_FREE(&new_state);
return retval;
}
#ifndef TSRM_WIN32
CWD_API int virtual_lstat(const char *path, struct stat *buf)
{
cwd_state new_state;
int retval;
CWDLS_FETCH();
CWD_STATE_COPY(&new_state, &CWDG(cwd));
virtual_file_ex(&new_state, path, NULL);
retval = lstat(new_state.cwd, buf);
CWD_STATE_FREE(&new_state);
return retval;
}
#endif
CWD_API int virtual_unlink(const char *path)
{
cwd_state new_state;
int retval;
CWDLS_FETCH();
CWD_STATE_COPY(&new_state, &CWDG(cwd));
virtual_file_ex(&new_state, path, NULL);
retval = unlink(new_state.cwd);
CWD_STATE_FREE(&new_state);
return retval;
}
CWD_API int virtual_mkdir(const char *pathname, mode_t mode)
{
cwd_state new_state;
int retval;
CWDLS_FETCH();
CWD_STATE_COPY(&new_state, &CWDG(cwd));
virtual_file_ex(&new_state, pathname, NULL);
#ifdef TSRM_WIN32
retval = mkdir(new_state.cwd);
#else
retval = mkdir(new_state.cwd, mode);
#endif
CWD_STATE_FREE(&new_state);
return retval;
}
CWD_API int virtual_rmdir(const char *pathname)
{
cwd_state new_state;
int retval;
CWDLS_FETCH();
CWD_STATE_COPY(&new_state, &CWDG(cwd));
virtual_file_ex(&new_state, pathname, NULL);
retval = rmdir(new_state.cwd);
CWD_STATE_FREE(&new_state);
return retval;
}
#ifdef TSRM_WIN32
DIR *opendir(const char *name);
#endif
CWD_API DIR *virtual_opendir(const char *pathname)
{
cwd_state new_state;
DIR *retval;
CWDLS_FETCH();
CWD_STATE_COPY(&new_state, &CWDG(cwd));
virtual_file_ex(&new_state, pathname, NULL);
retval = opendir(new_state.cwd);
CWD_STATE_FREE(&new_state);
return retval;
}
#ifndef TSRM_WIN32
CWD_API FILE *virtual_popen(const char *command, const char *type)
{
int command_length;
char *command_line;
char *ptr;
FILE *retval;
CWDLS_FETCH();
command_length = strlen(command);
ptr = command_line = (char *) malloc(command_length + sizeof("cd ; ") + CWDG(cwd).cwd_length+1);
if (!command_line) {
return NULL;
}
memcpy(ptr, "cd ", sizeof("cd ")-1);
ptr += sizeof("cd ")-1;
if (CWDG(cwd).cwd_length == 0) {
*ptr++ = DEFAULT_SLASH;
} else {
memcpy(ptr, CWDG(cwd).cwd, CWDG(cwd).cwd_length);
ptr += CWDG(cwd).cwd_length;
}
*ptr++ = ' ';
*ptr++ = ';';
*ptr++ = ' ';
memcpy(ptr, command, command_length+1);
#ifdef TSRM_WIN32
retval = _popen(command_line, type);
#else
retval = popen(command_line, type);
#endif
free(command_line);
return retval;
}
#else
/* On Windows the trick of prepending "cd cwd; " doesn't work so we need to perform
a real chdir() and mutex it
*/
CWD_API FILE *virtual_popen(const char *command, const char *type)
{
char prev_cwd[MAXPATHLEN];
char *getcwd_result;
FILE *retval;
CWDLS_FETCH();
getcwd_result = getcwd(prev_cwd, MAXPATHLEN);
if (!getcwd_result) {
return NULL;
}
#ifdef ZTS
tsrm_mutex_lock(cwd_mutex);
#endif
chdir(CWDG(cwd).cwd);
retval = _popen(command, type);
chdir(prev_cwd);
#ifdef ZTS
tsrm_mutex_unlock(cwd_mutex);
#endif
return retval;
}
#endif
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
*/