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proc_open.c
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/*
+----------------------------------------------------------------------+
| Copyright (c) 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: |
| https://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 |
| [email protected] so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Wez Furlong <[email protected]> |
+----------------------------------------------------------------------+
*/
#include "php.h"
#include <ctype.h>
#include <signal.h>
#include "ext/standard/basic_functions.h"
#include "ext/standard/file.h"
#include "exec.h"
#include "SAPI.h"
#include "main/php_network.h"
#include "zend_smart_str.h"
#ifdef PHP_WIN32
# include "win32/sockets.h"
#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_POSIX_SPAWN_FILE_ACTIONS_ADDCHDIR_NP
/* Only defined on glibc >= 2.29, FreeBSD CURRENT, musl >= 1.1.24,
* MacOS Catalina or later..
* It should be possible to modify this so it is also
* used in older systems when $cwd == NULL but care must be taken
* as at least glibc < 2.24 has a legacy implementation known
* to be really buggy.
*/
#include <spawn.h>
#define USE_POSIX_SPAWN
#endif
/* This symbol is defined in ext/standard/config.m4.
* Essentially, it is set if you HAVE_FORK || PHP_WIN32
* Other platforms may modify that configure check and add suitable #ifdefs
* around the alternate code. */
#ifdef PHP_CAN_SUPPORT_PROC_OPEN
#ifdef HAVE_OPENPTY
# ifdef HAVE_PTY_H
# include <pty.h>
# elif defined(__FreeBSD__)
/* FreeBSD defines `openpty` in <libutil.h> */
# include <libutil.h>
# elif defined(__NetBSD__) || defined(__DragonFly__)
/* On recent NetBSD/DragonFlyBSD releases the emalloc, estrdup ... calls had been introduced in libutil */
# if defined(__NetBSD__)
# include <sys/termios.h>
# else
# include <termios.h>
# endif
extern int openpty(int *, int *, char *, struct termios *, struct winsize *);
# elif defined(__sun)
# include <termios.h>
# else
/* Mac OS X (and some BSDs) define `openpty` in <util.h> */
# include <util.h>
# endif
#elif defined(__sun)
# include <fcntl.h>
# include <stropts.h>
# include <termios.h>
# define HAVE_OPENPTY 1
/* Solaris before version 11.4 and Illumos do not have any openpty implementation */
int openpty(int *master, int *slave, char *name, struct termios *termp, struct winsize *winp)
{
int fd, sd;
const char *slaveid;
assert(master);
assert(slave);
sd = *master = *slave = -1;
fd = open("/dev/ptmx", O_NOCTTY|O_RDWR);
if (fd == -1) {
return -1;
}
/* Checking if we can have to the pseudo terminal */
if (grantpt(fd) != 0 || unlockpt(fd) != 0) {
goto fail;
}
slaveid = ptsname(fd);
if (!slaveid) {
goto fail;
}
/* Getting the slave path and pushing pseudo terminal */
sd = open(slaveid, O_NOCTTY|O_RDONLY);
if (sd == -1 || ioctl(sd, I_PUSH, "ptem") == -1) {
goto fail;
}
if (termp) {
if (tcgetattr(sd, termp) < 0) {
goto fail;
}
}
if (winp) {
if (ioctl(sd, TIOCSWINSZ, winp) == -1) {
goto fail;
}
}
*slave = sd;
*master = fd;
return 0;
fail:
if (sd != -1) {
close(sd);
}
if (fd != -1) {
close(fd);
}
return -1;
}
#endif
#include "proc_open.h"
static int le_proc_open; /* Resource number for `proc` resources */
/* {{{ php_array_to_envp
* Process the `environment` argument to `proc_open`
* Convert into data structures which can be passed to underlying OS APIs like `exec` on POSIX or
* `CreateProcessW` on Win32 */
static php_process_env php_array_to_envp(ZEND_ATTRIBUTE_NONNULL const HashTable *environment)
{
zval *element;
php_process_env env;
zend_string *key, *str;
#ifndef PHP_WIN32
char **ep;
#endif
char *p;
size_t sizeenv = 0;
HashTable *env_hash; /* temporary PHP array used as helper */
memset(&env, 0, sizeof(env));
uint32_t cnt = zend_hash_num_elements(environment);
if (cnt == 0) {
#ifndef PHP_WIN32
env.envarray = (char **) ecalloc(1, sizeof(char *));
#endif
env.envp = (char *) ecalloc(4, 1);
return env;
}
ALLOC_HASHTABLE(env_hash);
zend_hash_init(env_hash, cnt, NULL, NULL, 0);
/* first, we have to get the size of all the elements in the hash */
ZEND_HASH_FOREACH_STR_KEY_VAL(environment, key, element) {
str = zval_get_string(element);
if (ZSTR_LEN(str) == 0) {
zend_string_release_ex(str, 0);
continue;
}
sizeenv += ZSTR_LEN(str) + 1;
if (key && ZSTR_LEN(key)) {
sizeenv += ZSTR_LEN(key) + 1;
zend_hash_add_ptr(env_hash, key, str);
} else {
zend_hash_next_index_insert_ptr(env_hash, str);
}
} ZEND_HASH_FOREACH_END();
#ifndef PHP_WIN32
ep = env.envarray = (char **) ecalloc(cnt + 1, sizeof(char *));
#endif
p = env.envp = (char *) ecalloc(sizeenv + 4, 1);
ZEND_HASH_FOREACH_STR_KEY_PTR(env_hash, key, str) {
#ifndef PHP_WIN32
*ep = p;
++ep;
#endif
if (key) {
p = zend_mempcpy(p, ZSTR_VAL(key), ZSTR_LEN(key));
*p++ = '=';
}
p = zend_mempcpy(p, ZSTR_VAL(str), ZSTR_LEN(str));
*p++ = '\0';
zend_string_release_ex(str, 0);
} ZEND_HASH_FOREACH_END();
assert((uint32_t)(p - env.envp) <= sizeenv);
zend_hash_destroy(env_hash);
FREE_HASHTABLE(env_hash);
return env;
}
/* }}} */
/* {{{ _php_free_envp
* Free the structures allocated by php_array_to_envp */
static void _php_free_envp(php_process_env env)
{
#ifndef PHP_WIN32
if (env.envarray) {
efree(env.envarray);
}
#endif
if (env.envp) {
efree(env.envp);
}
}
/* }}} */
#ifdef HAVE_SYS_WAIT_H
static pid_t waitpid_cached(php_process_handle *proc, int *wait_status, int options)
{
if (proc->has_cached_exit_wait_status) {
*wait_status = proc->cached_exit_wait_status_value;
return proc->child;
}
pid_t wait_pid = waitpid(proc->child, wait_status, options);
/* The "exit" status is the final status of the process.
* If we were to cache the status unconditionally,
* we would return stale statuses in the future after the process continues. */
if (wait_pid > 0 && WIFEXITED(*wait_status)) {
proc->has_cached_exit_wait_status = true;
proc->cached_exit_wait_status_value = *wait_status;
}
return wait_pid;
}
#endif
/* {{{ proc_open_rsrc_dtor
* Free `proc` resource, either because all references to it were dropped or because `pclose` or
* `proc_close` were called */
static void proc_open_rsrc_dtor(zend_resource *rsrc)
{
php_process_handle *proc = (php_process_handle*)rsrc->ptr;
#ifdef PHP_WIN32
DWORD wstatus;
#elif HAVE_SYS_WAIT_H
int wstatus;
int waitpid_options = 0;
pid_t wait_pid;
#endif
/* Close all handles to avoid a deadlock */
for (int i = 0; i < proc->npipes; i++) {
if (proc->pipes[i] != NULL) {
GC_DELREF(proc->pipes[i]);
zend_list_close(proc->pipes[i]);
proc->pipes[i] = NULL;
}
}
/* `pclose_wait` tells us: Are we freeing this resource because `pclose` or `proc_close` were
* called? If so, we need to wait until the child process exits, because its exit code is
* needed as the return value of those functions.
* But if we're freeing the resource because of GC, don't wait. */
#ifdef PHP_WIN32
if (FG(pclose_wait)) {
WaitForSingleObject(proc->childHandle, INFINITE);
}
GetExitCodeProcess(proc->childHandle, &wstatus);
if (wstatus == STILL_ACTIVE) {
FG(pclose_ret) = -1;
} else {
FG(pclose_ret) = wstatus;
}
CloseHandle(proc->childHandle);
#elif HAVE_SYS_WAIT_H
if (!FG(pclose_wait)) {
waitpid_options = WNOHANG;
}
do {
wait_pid = waitpid_cached(proc, &wstatus, waitpid_options);
} while (wait_pid == -1 && errno == EINTR);
if (wait_pid <= 0) {
FG(pclose_ret) = -1;
} else {
if (WIFEXITED(wstatus)) {
wstatus = WEXITSTATUS(wstatus);
}
FG(pclose_ret) = wstatus;
}
#else
FG(pclose_ret) = -1;
#endif
_php_free_envp(proc->env);
efree(proc->pipes);
zend_string_release_ex(proc->command, false);
efree(proc);
}
/* }}} */
/* {{{ PHP_MINIT_FUNCTION(proc_open) */
PHP_MINIT_FUNCTION(proc_open)
{
le_proc_open = zend_register_list_destructors_ex(proc_open_rsrc_dtor, NULL, "process",
module_number);
return SUCCESS;
}
/* }}} */
/* {{{ Kill a process opened by `proc_open` */
PHP_FUNCTION(proc_terminate)
{
zval *zproc;
php_process_handle *proc;
zend_long sig_no = SIGTERM;
ZEND_PARSE_PARAMETERS_START(1, 2)
Z_PARAM_RESOURCE(zproc)
Z_PARAM_OPTIONAL
Z_PARAM_LONG(sig_no)
ZEND_PARSE_PARAMETERS_END();
proc = (php_process_handle*)zend_fetch_resource(Z_RES_P(zproc), "process", le_proc_open);
if (proc == NULL) {
RETURN_THROWS();
}
#ifdef PHP_WIN32
RETURN_BOOL(TerminateProcess(proc->childHandle, 255));
#else
RETURN_BOOL(kill(proc->child, sig_no) == 0);
#endif
}
/* }}} */
/* {{{ Close a process opened by `proc_open` */
PHP_FUNCTION(proc_close)
{
zval *zproc;
php_process_handle *proc;
ZEND_PARSE_PARAMETERS_START(1, 1)
Z_PARAM_RESOURCE(zproc)
ZEND_PARSE_PARAMETERS_END();
proc = (php_process_handle*)zend_fetch_resource(Z_RES_P(zproc), "process", le_proc_open);
if (proc == NULL) {
RETURN_THROWS();
}
FG(pclose_wait) = 1; /* See comment in `proc_open_rsrc_dtor` */
zend_list_close(Z_RES_P(zproc));
FG(pclose_wait) = 0;
RETURN_LONG(FG(pclose_ret));
}
/* }}} */
/* {{{ Get information about a process opened by `proc_open` */
PHP_FUNCTION(proc_get_status)
{
zval *zproc;
php_process_handle *proc;
#ifdef PHP_WIN32
DWORD wstatus;
#elif HAVE_SYS_WAIT_H
int wstatus;
pid_t wait_pid;
#endif
bool running = 1, signaled = 0, stopped = 0;
int exitcode = -1, termsig = 0, stopsig = 0;
ZEND_PARSE_PARAMETERS_START(1, 1)
Z_PARAM_RESOURCE(zproc)
ZEND_PARSE_PARAMETERS_END();
proc = (php_process_handle*)zend_fetch_resource(Z_RES_P(zproc), "process", le_proc_open);
if (proc == NULL) {
RETURN_THROWS();
}
array_init(return_value);
add_assoc_str(return_value, "command", zend_string_copy(proc->command));
add_assoc_long(return_value, "pid", (zend_long)proc->child);
#ifdef PHP_WIN32
GetExitCodeProcess(proc->childHandle, &wstatus);
running = wstatus == STILL_ACTIVE;
exitcode = running ? -1 : wstatus;
/* The status is always available on Windows and will always read the same,
* even if the child has already exited. This is because the result stays available
* until the child handle is closed. Hence no caching is used on Windows. */
add_assoc_bool(return_value, "cached", false);
#elif HAVE_SYS_WAIT_H
wait_pid = waitpid_cached(proc, &wstatus, WNOHANG|WUNTRACED);
if (wait_pid == proc->child) {
if (WIFEXITED(wstatus)) {
running = 0;
exitcode = WEXITSTATUS(wstatus);
}
if (WIFSIGNALED(wstatus)) {
running = 0;
signaled = 1;
termsig = WTERMSIG(wstatus);
}
if (WIFSTOPPED(wstatus)) {
stopped = 1;
stopsig = WSTOPSIG(wstatus);
}
} else if (wait_pid == -1) {
/* The only error which could occur here is ECHILD, which means that the PID we were
* looking for either does not exist or is not a child of this process */
running = 0;
}
add_assoc_bool(return_value, "cached", proc->has_cached_exit_wait_status);
#endif
add_assoc_bool(return_value, "running", running);
add_assoc_bool(return_value, "signaled", signaled);
add_assoc_bool(return_value, "stopped", stopped);
add_assoc_long(return_value, "exitcode", exitcode);
add_assoc_long(return_value, "termsig", termsig);
add_assoc_long(return_value, "stopsig", stopsig);
}
/* }}} */
#ifdef PHP_WIN32
/* We use this to allow child processes to inherit handles
* One static instance can be shared and used for all calls to `proc_open`, since the values are
* never changed */
SECURITY_ATTRIBUTES php_proc_open_security = {
.nLength = sizeof(SECURITY_ATTRIBUTES),
.lpSecurityDescriptor = NULL,
.bInheritHandle = TRUE
};
# define pipe(pair) (CreatePipe(&pair[0], &pair[1], &php_proc_open_security, 0) ? 0 : -1)
# define COMSPEC_NT "cmd.exe"
static inline HANDLE dup_handle(HANDLE src, BOOL inherit, BOOL closeorig)
{
HANDLE copy, self = GetCurrentProcess();
if (!DuplicateHandle(self, src, self, ©, 0, inherit, DUPLICATE_SAME_ACCESS |
(closeorig ? DUPLICATE_CLOSE_SOURCE : 0)))
return NULL;
return copy;
}
static inline HANDLE dup_fd_as_handle(int fd)
{
return dup_handle((HANDLE)_get_osfhandle(fd), TRUE, FALSE);
}
# define close_descriptor(fd) CloseHandle(fd)
#else /* !PHP_WIN32 */
# define close_descriptor(fd) close(fd)
#endif
/* Determines the type of a descriptor item. */
typedef enum _descriptor_type {
DESCRIPTOR_TYPE_STD,
DESCRIPTOR_TYPE_PIPE,
DESCRIPTOR_TYPE_SOCKET
} descriptor_type;
/* One instance of this struct is created for each item in `$descriptorspec` argument to `proc_open`
* They are used within `proc_open` and freed before it returns */
typedef struct _descriptorspec_item {
int index; /* desired FD # in child process */
descriptor_type type;
php_file_descriptor_t childend; /* FD # opened for use in child
* (will be copied to `index` in child) */
php_file_descriptor_t parentend; /* FD # opened for use in parent
* (for pipes only; will be 0 otherwise) */
int mode_flags; /* mode for opening FDs: r/o, r/w, binary (on Win32), etc */
} descriptorspec_item;
static zend_string *get_valid_arg_string(zval *zv, uint32_t elem_num) {
zend_string *str = zval_get_string(zv);
if (!str) {
return NULL;
}
if (elem_num == 1 && ZSTR_LEN(str) == 0) {
zend_value_error("First element must contain a non-empty program name");
zend_string_release(str);
return NULL;
}
if (zend_str_has_nul_byte(str)) {
zend_value_error("Command array element %d contains a null byte", elem_num);
zend_string_release(str);
return NULL;
}
return str;
}
#ifdef PHP_WIN32
static void append_backslashes(smart_str *str, size_t num_bs)
{
for (size_t i = 0; i < num_bs; i++) {
smart_str_appendc(str, '\\');
}
}
const char *special_chars = "()!^\"<>&|%";
static bool is_special_character_present(const zend_string *arg)
{
for (size_t i = 0; i < ZSTR_LEN(arg); ++i) {
if (strchr(special_chars, ZSTR_VAL(arg)[i]) != NULL) {
return true;
}
}
return false;
}
/* See https://docs.microsoft.com/en-us/cpp/cpp/parsing-cpp-command-line-arguments and
* https://learn.microsoft.com/en-us/archive/blogs/twistylittlepassagesallalike/everyone-quotes-command-line-arguments-the-wrong-way */
static void append_win_escaped_arg(smart_str *str, zend_string *arg, bool is_cmd_argument)
{
size_t num_bs = 0;
bool has_special_character = false;
if (is_cmd_argument) {
has_special_character = is_special_character_present(arg);
if (has_special_character) {
/* Escape double quote with ^ if executed by cmd.exe. */
smart_str_appendc(str, '^');
}
}
smart_str_appendc(str, '"');
for (size_t i = 0; i < ZSTR_LEN(arg); ++i) {
char c = ZSTR_VAL(arg)[i];
if (c == '\\') {
num_bs++;
continue;
}
if (c == '"') {
/* Backslashes before " need to be doubled. */
num_bs = num_bs * 2 + 1;
}
append_backslashes(str, num_bs);
if (has_special_character && strchr(special_chars, c) != NULL) {
/* Escape special chars with ^ if executed by cmd.exe. */
smart_str_appendc(str, '^');
}
smart_str_appendc(str, c);
num_bs = 0;
}
append_backslashes(str, num_bs * 2);
if (has_special_character) {
/* Escape double quote with ^ if executed by cmd.exe. */
smart_str_appendc(str, '^');
}
smart_str_appendc(str, '"');
}
static bool is_executed_by_cmd(const char *prog_name, size_t prog_name_length)
{
size_t out_len;
WCHAR long_name[MAX_PATH];
WCHAR full_name[MAX_PATH];
LPWSTR file_part = NULL;
wchar_t *prog_name_wide = php_win32_cp_conv_any_to_w(prog_name, prog_name_length, &out_len);
if (GetLongPathNameW(prog_name_wide, long_name, MAX_PATH) == 0) {
/* This can fail for example with ERROR_FILE_NOT_FOUND (short path resolution only works for existing files)
* in which case we'll pass the path verbatim to the FullPath transformation. */
lstrcpynW(long_name, prog_name_wide, MAX_PATH);
}
free(prog_name_wide);
prog_name_wide = NULL;
if (GetFullPathNameW(long_name, MAX_PATH, full_name, &file_part) == 0 || file_part == NULL) {
return false;
}
bool uses_cmd = false;
if (_wcsicmp(file_part, L"cmd.exe") == 0 || _wcsicmp(file_part, L"cmd") == 0) {
uses_cmd = true;
} else {
const WCHAR *extension_dot = wcsrchr(file_part, L'.');
if (extension_dot && (_wcsicmp(extension_dot, L".bat") == 0 || _wcsicmp(extension_dot, L".cmd") == 0)) {
uses_cmd = true;
}
}
return uses_cmd;
}
static zend_string *create_win_command_from_args(HashTable *args)
{
smart_str str = {0};
zval *arg_zv;
bool is_prog_name = true;
bool is_cmd_execution = false;
uint32_t elem_num = 0;
ZEND_HASH_FOREACH_VAL(args, arg_zv) {
zend_string *arg_str = get_valid_arg_string(arg_zv, ++elem_num);
if (!arg_str) {
smart_str_free(&str);
return NULL;
}
if (is_prog_name) {
is_cmd_execution = is_executed_by_cmd(ZSTR_VAL(arg_str), ZSTR_LEN(arg_str));
} else {
smart_str_appendc(&str, ' ');
}
append_win_escaped_arg(&str, arg_str, !is_prog_name && is_cmd_execution);
is_prog_name = 0;
zend_string_release(arg_str);
} ZEND_HASH_FOREACH_END();
smart_str_0(&str);
return str.s;
}
/* Get a boolean option from the `other_options` array which can be passed to `proc_open`.
* (Currently, all options apply on Windows only.) */
static bool get_option(zval *other_options, char *opt_name, size_t opt_name_len)
{
HashTable *opt_ary = Z_ARRVAL_P(other_options);
zval *item = zend_hash_str_find_deref(opt_ary, opt_name, opt_name_len);
return item != NULL &&
(Z_TYPE_P(item) == IS_TRUE ||
((Z_TYPE_P(item) == IS_LONG) && Z_LVAL_P(item)));
}
/* Initialize STARTUPINFOW struct, used on Windows when spawning a process.
* Ref: https://docs.microsoft.com/en-us/windows/win32/api/processthreadsapi/ns-processthreadsapi-startupinfow */
static void init_startup_info(STARTUPINFOW *si, descriptorspec_item *descriptors, int ndesc)
{
memset(si, 0, sizeof(STARTUPINFOW));
si->cb = sizeof(STARTUPINFOW);
si->dwFlags = STARTF_USESTDHANDLES;
si->hStdInput = GetStdHandle(STD_INPUT_HANDLE);
si->hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE);
si->hStdError = GetStdHandle(STD_ERROR_HANDLE);
/* redirect stdin/stdout/stderr if requested */
for (int i = 0; i < ndesc; i++) {
switch (descriptors[i].index) {
case 0:
si->hStdInput = descriptors[i].childend;
break;
case 1:
si->hStdOutput = descriptors[i].childend;
break;
case 2:
si->hStdError = descriptors[i].childend;
break;
}
}
}
static void init_process_info(PROCESS_INFORMATION *pi)
{
memset(&pi, 0, sizeof(pi));
}
/* on success, returns length of *comspec, which then needs to be efree'd by caller */
static size_t find_comspec_nt(wchar_t **comspec)
{
zend_string *path = NULL;
wchar_t *pathw = NULL;
wchar_t *bufp = NULL;
DWORD buflen = MAX_PATH, len = 0;
path = php_getenv("PATH", 4);
if (path == NULL) {
goto out;
}
pathw = php_win32_cp_any_to_w(ZSTR_VAL(path));
if (pathw == NULL) {
goto out;
}
bufp = emalloc(buflen * sizeof(wchar_t));
do {
/* the first call to SearchPathW() fails if the buffer is too small,
* what is unlikely but possible; to avoid an explicit second call to
* SeachPathW() and the error handling, we're looping */
len = SearchPathW(pathw, L"cmd.exe", NULL, buflen, bufp, NULL);
if (len == 0) {
goto out;
}
if (len < buflen) {
break;
}
buflen = len;
bufp = erealloc(bufp, buflen * sizeof(wchar_t));
} while (1);
*comspec = bufp;
out:
if (path != NULL) {
zend_string_release(path);
}
if (pathw != NULL) {
free(pathw);
}
if (bufp != NULL && bufp != *comspec) {
efree(bufp);
}
return len;
}
static zend_result convert_command_to_use_shell(wchar_t **cmdw, size_t cmdw_len)
{
wchar_t *comspec;
size_t len = find_comspec_nt(&comspec);
if (len == 0) {
php_error_docref(NULL, E_WARNING, "Command conversion failed");
return FAILURE;
}
len += sizeof(" /s /c ") + cmdw_len + 3;
wchar_t *cmdw_shell = (wchar_t *)malloc(len * sizeof(wchar_t));
if (cmdw_shell == NULL) {
efree(comspec);
php_error_docref(NULL, E_WARNING, "Command conversion failed");
return FAILURE;
}
if (_snwprintf(cmdw_shell, len, L"%s /s /c \"%s\"", comspec, *cmdw) == -1) {
efree(comspec);
free(cmdw_shell);
php_error_docref(NULL, E_WARNING, "Command conversion failed");
return FAILURE;
}
efree(comspec);
free(*cmdw);
*cmdw = cmdw_shell;
return SUCCESS;
}
#endif
#ifndef PHP_WIN32
/* Convert command parameter array passed as first argument to `proc_open` into command string */
static zend_string* get_command_from_array(const HashTable *array, char ***argv, uint32_t num_elems)
{
zval *arg_zv;
zend_string *command = NULL;
uint32_t i = 0;
*argv = safe_emalloc(sizeof(char *), num_elems + 1, 0);
ZEND_HASH_FOREACH_VAL(array, arg_zv) {
zend_string *arg_str = get_valid_arg_string(arg_zv, i + 1);
if (!arg_str) {
/* Terminate with NULL so exit_fail code knows how many entries to free */
(*argv)[i] = NULL;
if (command != NULL) {
zend_string_release_ex(command, false);
}
return NULL;
}
if (i == 0) {
command = zend_string_copy(arg_str);
}
(*argv)[i++] = estrdup(ZSTR_VAL(arg_str));
zend_string_release(arg_str);
} ZEND_HASH_FOREACH_END();
(*argv)[i] = NULL;
return command;
}
#endif
static descriptorspec_item* alloc_descriptor_array(const HashTable *descriptorspec)
{
uint32_t ndescriptors = zend_hash_num_elements(descriptorspec);
return ecalloc(ndescriptors, sizeof(descriptorspec_item));
}
static zend_string* get_string_parameter(const HashTable *ht, unsigned int index, const char *param_name)
{
zval *array_item;
if ((array_item = zend_hash_index_find(ht, index)) == NULL) {
zend_value_error("Missing %s", param_name);
return NULL;
}
return zval_try_get_string(array_item);
}
static zend_result set_proc_descriptor_to_blackhole(descriptorspec_item *desc)
{
#ifdef PHP_WIN32
desc->childend = CreateFileA("nul", GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);
if (desc->childend == NULL) {
php_error_docref(NULL, E_WARNING, "Failed to open nul");
return FAILURE;
}
#else
desc->childend = open("/dev/null", O_RDWR);
if (desc->childend < 0) {
php_error_docref(NULL, E_WARNING, "Failed to open /dev/null: %s", strerror(errno));
return FAILURE;
}
#endif
return SUCCESS;
}
static zend_result set_proc_descriptor_to_pty(descriptorspec_item *desc, int *master_fd, int *slave_fd)
{
#ifdef HAVE_OPENPTY
/* All FDs set to PTY in the child process will go to the slave end of the same PTY.
* Likewise, all the corresponding entries in `$pipes` in the parent will all go to the master
* end of the same PTY.
* If this is the first descriptorspec set to 'pty', find an available PTY and get master and
* slave FDs. */
if (*master_fd == -1) {
if (openpty(master_fd, slave_fd, NULL, NULL, NULL)) {
php_error_docref(NULL, E_WARNING, "Could not open PTY (pseudoterminal): %s", strerror(errno));
return FAILURE;
}
}
desc->type = DESCRIPTOR_TYPE_PIPE;
desc->childend = dup(*slave_fd);
desc->parentend = dup(*master_fd);
desc->mode_flags = O_RDWR;
return SUCCESS;
#else
php_error_docref(NULL, E_WARNING, "PTY (pseudoterminal) not supported on this system");
return FAILURE;
#endif
}
/* Mark the descriptor close-on-exec, so it won't be inherited by children */
static php_file_descriptor_t make_descriptor_cloexec(php_file_descriptor_t fd)
{
#ifdef PHP_WIN32
return dup_handle(fd, FALSE, TRUE);
#else
#if defined(F_SETFD) && defined(FD_CLOEXEC)
fcntl(fd, F_SETFD, FD_CLOEXEC);
#endif
return fd;
#endif
}
static zend_result set_proc_descriptor_to_pipe(descriptorspec_item *desc, zend_string *zmode)
{
php_file_descriptor_t newpipe[2];
if (pipe(newpipe)) {
php_error_docref(NULL, E_WARNING, "Unable to create pipe %s", strerror(errno));
return FAILURE;
}
desc->type = DESCRIPTOR_TYPE_PIPE;
if (!zend_string_starts_with_literal(zmode, "w")) {
desc->parentend = newpipe[1];
desc->childend = newpipe[0];
desc->mode_flags = O_WRONLY;
} else {
desc->parentend = newpipe[0];
desc->childend = newpipe[1];
desc->mode_flags = O_RDONLY;
}
desc->parentend = make_descriptor_cloexec(desc->parentend);
#ifdef PHP_WIN32
if (ZSTR_LEN(zmode) >= 2 && ZSTR_VAL(zmode)[1] == 'b')
desc->mode_flags |= O_BINARY;
#endif
return SUCCESS;
}
#ifdef PHP_WIN32
#define create_socketpair(socks) socketpair_win32(AF_INET, SOCK_STREAM, 0, (socks), 0)
#else
#define create_socketpair(socks) socketpair(AF_UNIX, SOCK_STREAM, 0, (socks))
#endif
static zend_result set_proc_descriptor_to_socket(descriptorspec_item *desc)
{
php_socket_t sock[2];
if (create_socketpair(sock)) {
zend_string *err = php_socket_error_str(php_socket_errno());
php_error_docref(NULL, E_WARNING, "Unable to create socket pair: %s", ZSTR_VAL(err));
zend_string_release(err);
return FAILURE;
}
desc->type = DESCRIPTOR_TYPE_SOCKET;
desc->parentend = make_descriptor_cloexec((php_file_descriptor_t) sock[0]);
/* Pass sock[1] to child because it will never use overlapped IO on Windows. */
desc->childend = (php_file_descriptor_t) sock[1];
return SUCCESS;
}
static zend_result set_proc_descriptor_to_file(descriptorspec_item *desc, zend_string *file_path,
zend_string *file_mode)
{
php_socket_t fd;
/* try a wrapper */
php_stream *stream = php_stream_open_wrapper(ZSTR_VAL(file_path), ZSTR_VAL(file_mode),
REPORT_ERRORS|STREAM_WILL_CAST, NULL);
if (stream == NULL) {
return FAILURE;
}
/* force into an fd */
if (php_stream_cast(stream, PHP_STREAM_CAST_RELEASE|PHP_STREAM_AS_FD, (void **)&fd,
REPORT_ERRORS) == FAILURE) {
return FAILURE;
}
#ifdef PHP_WIN32
desc->childend = dup_fd_as_handle((int)fd);
_close((int)fd);
/* Simulate the append mode by fseeking to the end of the file
* This introduces a potential race condition, but it is the best we can do */
if (strchr(ZSTR_VAL(file_mode), 'a')) {
SetFilePointer(desc->childend, 0, NULL, FILE_END);
}
#else
desc->childend = fd;
#endif
return SUCCESS;
}
static zend_result dup_proc_descriptor(php_file_descriptor_t from, php_file_descriptor_t *to,
zend_ulong nindex)
{
#ifdef PHP_WIN32
*to = dup_handle(from, TRUE, FALSE);
if (*to == NULL) {
php_error_docref(NULL, E_WARNING, "Failed to dup() for descriptor " ZEND_LONG_FMT, nindex);
return FAILURE;
}
#else
*to = dup(from);
if (*to < 0) {
php_error_docref(NULL, E_WARNING, "Failed to dup() for descriptor " ZEND_LONG_FMT ": %s",
nindex, strerror(errno));
return FAILURE;
}
#endif
return SUCCESS;
}
static zend_result redirect_proc_descriptor(descriptorspec_item *desc, int target,
const descriptorspec_item *descriptors, int ndesc, int nindex)
{
php_file_descriptor_t redirect_to = PHP_INVALID_FD;
for (int i = 0; i < ndesc; i++) {
if (descriptors[i].index == target) {
redirect_to = descriptors[i].childend;