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gnupg/common/exechelp-w32.c

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/* exechelp-w32.c - Fork and exec helpers for W32.
* Copyright (C) 2004, 2007-2009, 2010 Free Software Foundation, Inc.
* Copyright (C) 2004, 2006-2012, 2014-2017 g10 Code GmbH
*
* This file is part of GnuPG.
*
* This file is free software; you can redistribute it and/or modify
* it under the terms of either
*
* - the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* or
*
* - the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* or both in parallel, as here.
*
* This file is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses/>.
* SPDX-License-Identifier: (LGPL-3.0+ OR GPL-2.0+)
*/
#include <config.h>
#if !defined(HAVE_W32_SYSTEM)
#error This code is only used on W32.
#else
#define _WIN32_WINNT 0x600
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#ifdef HAVE_SIGNAL_H
# include <signal.h>
#endif
#include <unistd.h>
#include <fcntl.h>
#ifdef WITHOUT_NPTH /* Give the Makefile a chance to build without Pth. */
#undef HAVE_NPTH
#undef USE_NPTH
#endif
#ifdef HAVE_NPTH
#include <npth.h>
#endif
#ifdef HAVE_STAT
# include <sys/stat.h>
#endif
#include "util.h"
#include "i18n.h"
#include "sysutils.h"
#define NEED_STRUCT_SPAWN_CB_ARG
#include "exechelp.h"
#include <windows.h>
#include <processthreadsapi.h>
/* Define to 1 do enable debugging. */
#define DEBUG_W32_SPAWN 0
/* It seems Vista doesn't grok X_OK and so fails access() tests.
Previous versions interpreted X_OK as F_OK anyway, so we'll just
use F_OK directly. */
#undef X_OK
#define X_OK F_OK
/* We assume that a HANDLE can be represented by an intptr_t which
should be true for all systems (HANDLE is defined as void *).
Further we assume that -1 denotes an invalid handle. */
# define fd_to_handle(a) ((HANDLE)(a))
# define handle_to_fd(a) ((intptr_t)(a))
# define pid_to_handle(a) ((HANDLE)(a))
# define handle_to_pid(a) ((int)(a))
/* Helper */
static inline gpg_error_t
my_error_from_syserror (void)
{
return gpg_err_make (default_errsource, gpg_err_code_from_syserror ());
}
static inline gpg_error_t
my_error (int errcode)
{
return gpg_err_make (default_errsource, errcode);
}
/* Return the maximum number of currently allowed open file
descriptors. Only useful on POSIX systems but returns a value on
other systems too. */
int
get_max_fds (void)
{
int max_fds = -1;
#ifdef OPEN_MAX
if (max_fds == -1)
max_fds = OPEN_MAX;
#endif
if (max_fds == -1)
max_fds = 256; /* Arbitrary limit. */
return max_fds;
}
/* Under Windows this is a dummy function. */
void
close_all_fds (int first, int *except)
{
(void)first;
(void)except;
}
/* Returns an array with all currently open file descriptors. The end
* of the array is marked by -1. The caller needs to release this
* array using the *standard free* and not with xfree. This allow the
* use of this function right at startup even before libgcrypt has
* been initialized. Returns NULL on error and sets ERRNO
* accordingly. Note that fstat prints a warning to DebugView for all
* invalid fds which is a bit annoying. We actually do not need this
* function in real code (close_all_fds is a dummy anyway) but we keep
* it for use by t-exechelp.c. */
int *
get_all_open_fds (void)
{
int *array;
size_t narray;
int fd, max_fd, idx;
#ifndef HAVE_STAT
array = calloc (1, sizeof *array);
if (array)
array[0] = -1;
#else /*HAVE_STAT*/
struct stat statbuf;
max_fd = get_max_fds ();
narray = 32; /* If you change this change also t-exechelp.c. */
array = calloc (narray, sizeof *array);
if (!array)
return NULL;
/* Note: The list we return is ordered. */
for (idx=0, fd=0; fd < max_fd; fd++)
if (!(fstat (fd, &statbuf) == -1 && errno == EBADF))
{
if (idx+1 >= narray)
{
int *tmp;
narray += (narray < 256)? 32:256;
tmp = realloc (array, narray * sizeof *array);
if (!tmp)
{
free (array);
return NULL;
}
array = tmp;
}
array[idx++] = fd;
}
array[idx] = -1;
#endif /*HAVE_STAT*/
return array;
}
/* Helper function to build_w32_commandline. */
static char *
build_w32_commandline_copy (char *buffer, const char *string)
{
char *p = buffer;
const char *s;
if (!*string) /* Empty string. */
p = stpcpy (p, "\"\"");
else if (strpbrk (string, " \t\n\v\f\""))
{
/* Need to do some kind of quoting. */
p = stpcpy (p, "\"");
for (s=string; *s; s++)
{
*p++ = *s;
if (*s == '\"')
*p++ = *s;
}
*p++ = '\"';
*p = 0;
}
else
p = stpcpy (p, string);
return p;
}
/* Build a command line for use with W32's CreateProcess. On success
CMDLINE gets the address of a newly allocated string. */
static gpg_error_t
build_w32_commandline (const char *pgmname, const char * const *argv,
char **cmdline)
{
int i, n;
const char *s;
char *buf, *p;
*cmdline = NULL;
n = 0;
s = pgmname;
n += strlen (s) + 1 + 2; /* (1 space, 2 quoting */
for (; *s; s++)
if (*s == '\"')
n++; /* Need to double inner quotes. */
for (i=0; (s=argv[i]); i++)
{
n += strlen (s) + 1 + 2; /* (1 space, 2 quoting */
for (; *s; s++)
if (*s == '\"')
n++; /* Need to double inner quotes. */
}
n++;
buf = p = xtrymalloc (n);
if (!buf)
return my_error_from_syserror ();
p = build_w32_commandline_copy (p, pgmname);
for (i=0; argv[i]; i++)
{
*p++ = ' ';
p = build_w32_commandline_copy (p, argv[i]);
}
*cmdline= buf;
return 0;
}
#define INHERIT_READ 1
#define INHERIT_WRITE 2
#define INHERIT_BOTH (INHERIT_READ|INHERIT_WRITE)
/* Create pipe. FLAGS indicates which ends are inheritable. */
static int
create_inheritable_pipe (HANDLE filedes[2], int flags)
{
HANDLE r, w;
SECURITY_ATTRIBUTES sec_attr;
memset (&sec_attr, 0, sizeof sec_attr );
sec_attr.nLength = sizeof sec_attr;
sec_attr.bInheritHandle = TRUE;
if (!CreatePipe (&r, &w, &sec_attr, 0))
return -1;
if ((flags & INHERIT_READ) == 0)
if (! SetHandleInformation (r, HANDLE_FLAG_INHERIT, 0))
goto fail;
if ((flags & INHERIT_WRITE) == 0)
if (! SetHandleInformation (w, HANDLE_FLAG_INHERIT, 0))
goto fail;
filedes[0] = r;
filedes[1] = w;
return 0;
fail:
log_error ("SetHandleInformation failed: %s\n", w32_strerror (-1));
CloseHandle (r);
CloseHandle (w);
return -1;
}
static HANDLE
w32_open_null (int for_write)
{
HANDLE hfile;
hfile = CreateFileW (L"nul",
for_write? GENERIC_WRITE : GENERIC_READ,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL, OPEN_EXISTING, 0, NULL);
if (hfile == INVALID_HANDLE_VALUE)
log_debug ("can't open 'nul': %s\n", w32_strerror (-1));
return hfile;
}
static gpg_error_t
create_pipe_and_estream (int filedes[2], int flags,
estream_t *r_fp, int outbound, int nonblock)
{
gpg_error_t err = 0;
HANDLE fds[2];
es_syshd_t syshd;
filedes[0] = filedes[1] = -1;
err = my_error (GPG_ERR_GENERAL);
if (!create_inheritable_pipe (fds, flags))
{
filedes[0] = _open_osfhandle (handle_to_fd (fds[0]), O_RDONLY);
if (filedes[0] == -1)
{
log_error ("failed to translate osfhandle %p\n", fds[0]);
CloseHandle (fds[1]);
}
else
{
filedes[1] = _open_osfhandle (handle_to_fd (fds[1]), O_APPEND);
if (filedes[1] == -1)
{
log_error ("failed to translate osfhandle %p\n", fds[1]);
close (filedes[0]);
filedes[0] = -1;
CloseHandle (fds[1]);
}
else
err = 0;
}
}
if (! err && r_fp)
{
syshd.type = ES_SYSHD_HANDLE;
if (!outbound)
{
syshd.u.handle = fds[0];
*r_fp = es_sysopen (&syshd, nonblock? "r,nonblock" : "r");
}
else
{
syshd.u.handle = fds[1];
*r_fp = es_sysopen (&syshd, nonblock? "w,nonblock" : "w");
}
if (!*r_fp)
{
err = my_error_from_syserror ();
log_error (_("error creating a stream for a pipe: %s\n"),
gpg_strerror (err));
close (filedes[0]);
close (filedes[1]);
filedes[0] = filedes[1] = -1;
return err;
}
}
return err;
}
/* Portable function to create a pipe. Under Windows the write end is
inheritable. If R_FP is not NULL, an estream is created for the
read end and stored at R_FP. */
gpg_error_t
gnupg_create_inbound_pipe (int filedes[2], estream_t *r_fp, int nonblock)
{
return create_pipe_and_estream (filedes, INHERIT_WRITE,
r_fp, 0, nonblock);
}
/* Portable function to create a pipe. Under Windows the read end is
inheritable. If R_FP is not NULL, an estream is created for the
write end and stored at R_FP. */
gpg_error_t
gnupg_create_outbound_pipe (int filedes[2], estream_t *r_fp, int nonblock)
{
return create_pipe_and_estream (filedes, INHERIT_READ,
r_fp, 1, nonblock);
}
/* Portable function to create a pipe. Under Windows both ends are
inheritable. */
gpg_error_t
gnupg_create_pipe (int filedes[2])
{
return create_pipe_and_estream (filedes, INHERIT_BOTH,
NULL, 0, 0);
}
/* Close the end of a pipe. */
void
gnupg_close_pipe (int fd)
{
if (fd != -1)
close (fd);
}
struct gnupg_process {
const char *pgmname;
unsigned int terminated :1; /* or detached */
unsigned int flags;
HANDLE hProcess;
HANDLE hd_in;
HANDLE hd_out;
HANDLE hd_err;
int exitcode;
};
static int gnupg_process_syscall_func_initialized;
/* Functions called before and after blocking syscalls. */
static void (*pre_syscall_func) (void);
static void (*post_syscall_func) (void);
static void
check_syscall_func (void)
{
if (!gnupg_process_syscall_func_initialized)
{
gpgrt_get_syscall_clamp (&pre_syscall_func, &post_syscall_func);
gnupg_process_syscall_func_initialized = 1;
}
}
static void
pre_syscall (void)
{
if (pre_syscall_func)
pre_syscall_func ();
}
static void
post_syscall (void)
{
if (post_syscall_func)
post_syscall_func ();
}
/*
* Check if STARTUPINFOEXW supports PROC_THREAD_ATTRIBUTE_HANDLE_LIST.
*/
static int
check_windows_version (void)
{
static int is_vista_or_later = -1;
OSVERSIONINFO osvi;
if (is_vista_or_later == -1)
{
memset (&osvi,0,sizeof(osvi));
osvi.dwOSVersionInfoSize = sizeof(osvi);
GetVersionEx (&osvi);
/* The feature is available on Vista or later. */
is_vista_or_later = (osvi.dwMajorVersion >= 6);
}
return is_vista_or_later;
}
static gpg_err_code_t
spawn_detached (const char *pgmname, char *cmdline,
void (*spawn_cb) (struct spawn_cb_arg *), void *spawn_cb_arg)
{
SECURITY_ATTRIBUTES sec_attr;
PROCESS_INFORMATION pi = { NULL, 0, 0, 0 };
STARTUPINFOEXW si;
int cr_flags;
wchar_t *wcmdline = NULL;
wchar_t *wpgmname = NULL;
gpg_err_code_t ec;
int ret;
struct spawn_cb_arg sca;
BOOL ask_inherit = FALSE;
ec = gnupg_access (pgmname, X_OK);
if (ec)
{
xfree (cmdline);
return ec;
}
memset (&si, 0, sizeof si);
sca.allow_foreground_window = FALSE;
sca.hd[0] = INVALID_HANDLE_VALUE;
sca.hd[1] = INVALID_HANDLE_VALUE;
sca.hd[2] = INVALID_HANDLE_VALUE;
sca.inherit_hds = NULL;
sca.arg = spawn_cb_arg;
if (spawn_cb)
(*spawn_cb) (&sca);
if (sca.inherit_hds)
{
SIZE_T attr_list_size = 0;
HANDLE hd[16];
HANDLE *hd_p = sca.inherit_hds;
int j = 0;
if (hd_p)
{
while (*hd_p != INVALID_HANDLE_VALUE)
if (j < DIM (hd))
hd[j++] = *hd_p++;
else
{
log_error ("Too much handles\n");
break;
}
}
if (j)
{
if (check_windows_version ())
{
InitializeProcThreadAttributeList (NULL, 1, 0, &attr_list_size);
si.lpAttributeList = xtrymalloc (attr_list_size);
if (si.lpAttributeList == NULL)
{
xfree (cmdline);
return gpg_err_code_from_syserror ();
}
InitializeProcThreadAttributeList (si.lpAttributeList, 1, 0,
&attr_list_size);
UpdateProcThreadAttribute (si.lpAttributeList, 0,
PROC_THREAD_ATTRIBUTE_HANDLE_LIST,
hd, sizeof (HANDLE) * j, NULL, NULL);
}
ask_inherit = TRUE;
}
}
/* Prepare security attributes. */
memset (&sec_attr, 0, sizeof sec_attr );
sec_attr.nLength = sizeof sec_attr;
sec_attr.bInheritHandle = FALSE;
/* Start the process. */
si.StartupInfo.cb = sizeof (si);
si.StartupInfo.dwFlags = STARTF_USESHOWWINDOW;
si.StartupInfo.wShowWindow = DEBUG_W32_SPAWN? SW_SHOW : SW_MINIMIZE;
cr_flags = (CREATE_DEFAULT_ERROR_MODE
| GetPriorityClass (GetCurrentProcess ())
| CREATE_NEW_PROCESS_GROUP
| DETACHED_PROCESS);
/* Take care: CreateProcessW may modify wpgmname */
if (!(wpgmname = utf8_to_wchar (pgmname)))
ret = 0;
else if (!(wcmdline = utf8_to_wchar (cmdline)))
ret = 0;
else
ret = CreateProcessW (wpgmname, /* Program to start. */
wcmdline, /* Command line arguments. */
&sec_attr, /* Process security attributes. */
&sec_attr, /* Thread security attributes. */
ask_inherit, /* Inherit handles. */
cr_flags, /* Creation flags. */
NULL, /* Environment. */
NULL, /* Use current drive/directory. */
(STARTUPINFOW *)&si, /* Startup information. */
&pi /* Returns process information. */
);
if (!ret)
{
if (!wpgmname || !wcmdline)
log_error ("CreateProcess failed (utf8_to_wchar): %s\n",
strerror (errno));
else
log_error ("CreateProcess(detached) failed: %d\n",
(int)GetLastError ());
xfree (wpgmname);
xfree (wcmdline);
xfree (cmdline);
return GPG_ERR_GENERAL;
}
if (si.lpAttributeList)
DeleteProcThreadAttributeList (si.lpAttributeList);
xfree (wpgmname);
xfree (wcmdline);
xfree (cmdline);
/* log_debug ("CreateProcess(detached) ready: hProcess=%p hThread=%p" */
/* " dwProcessID=%d dwThreadId=%d\n", */
/* pi.hProcess, pi.hThread, */
/* (int) pi.dwProcessId, (int) pi.dwThreadId); */
/* Note: AllowSetForegroundWindow doesn't make sense for background
process. */
CloseHandle (pi.hThread);
CloseHandle (pi.hProcess);
return 0;
}
void
gnupg_spawn_helper (struct spawn_cb_arg *sca)
{
HANDLE *user_except = sca->arg;
sca->inherit_hds = user_except;
}
gpg_err_code_t
gnupg_process_spawn (const char *pgmname, const char *argv[],
unsigned int flags,
void (*spawn_cb) (struct spawn_cb_arg *),
void *spawn_cb_arg,
gnupg_process_t *r_process)
{
gpg_err_code_t ec;
gnupg_process_t process;
SECURITY_ATTRIBUTES sec_attr;
PROCESS_INFORMATION pi = { NULL, 0, 0, 0 };
STARTUPINFOEXW si;
int cr_flags;
char *cmdline;
wchar_t *wcmdline = NULL;
wchar_t *wpgmname = NULL;
int ret;
HANDLE hd_in[2];
HANDLE hd_out[2];
HANDLE hd_err[2];
struct spawn_cb_arg sca;
int i;
BOOL ask_inherit = FALSE;
check_syscall_func ();
/* Build the command line. */
ec = build_w32_commandline (pgmname, argv, &cmdline);
if (ec)
return ec;
if ((flags & GNUPG_PROCESS_DETACHED))
{
if ((flags & GNUPG_PROCESS_STDFDS_SETTING))
{
xfree (cmdline);
return GPG_ERR_INV_FLAG;
}
/* In detached case, it must be no R_PROCESS. */
if (r_process)
{
xfree (cmdline);
return GPG_ERR_INV_ARG;
}
return spawn_detached (pgmname, cmdline, spawn_cb, spawn_cb_arg);
}
if (r_process)
*r_process = NULL;
process = xtrymalloc (sizeof (struct gnupg_process));
if (process == NULL)
{
xfree (cmdline);
return gpg_err_code_from_syserror ();
}
process->pgmname = pgmname;
process->flags = flags;
if ((flags & GNUPG_PROCESS_STDINOUT_SOCKETPAIR))
{
xfree (process);
xfree (cmdline);
return GPG_ERR_NOT_SUPPORTED;
}
if ((flags & GNUPG_PROCESS_STDIN_PIPE))
{
ec = create_inheritable_pipe (hd_in, INHERIT_READ);
if (ec)
{
xfree (process);
xfree (cmdline);
return ec;
}
}
else if ((flags & GNUPG_PROCESS_STDIN_KEEP))
{
hd_in[0] = GetStdHandle (STD_INPUT_HANDLE);
hd_in[1] = INVALID_HANDLE_VALUE;
}
else
{
hd_in[0] = w32_open_null (0);
hd_in[1] = INVALID_HANDLE_VALUE;
}
if ((flags & GNUPG_PROCESS_STDOUT_PIPE))
{
ec = create_inheritable_pipe (hd_out, INHERIT_WRITE);
if (ec)
{
if (hd_in[0] != INVALID_HANDLE_VALUE)
CloseHandle (hd_in[0]);
if (hd_in[1] != INVALID_HANDLE_VALUE)
CloseHandle (hd_in[1]);
xfree (process);
xfree (cmdline);
return ec;
}
}
else if ((flags & GNUPG_PROCESS_STDOUT_KEEP))
{
hd_out[0] = INVALID_HANDLE_VALUE;
hd_out[1] = GetStdHandle (STD_OUTPUT_HANDLE);
}
else
{
hd_out[0] = INVALID_HANDLE_VALUE;
hd_out[1] = w32_open_null (1);
}
if ((flags & GNUPG_PROCESS_STDERR_PIPE))
{
ec = create_inheritable_pipe (hd_err, INHERIT_WRITE);
if (ec)
{
if (hd_in[0] != INVALID_HANDLE_VALUE)
CloseHandle (hd_in[0]);
if (hd_in[1] != INVALID_HANDLE_VALUE)
CloseHandle (hd_in[1]);
if (hd_out[0] != INVALID_HANDLE_VALUE)
CloseHandle (hd_out[0]);
if (hd_out[1] != INVALID_HANDLE_VALUE)
CloseHandle (hd_out[1]);
xfree (process);
xfree (cmdline);
return ec;
}
}
else if ((flags & GNUPG_PROCESS_STDERR_KEEP))
{
hd_err[0] = INVALID_HANDLE_VALUE;
hd_err[1] = GetStdHandle (STD_ERROR_HANDLE);
}
else
{
hd_err[0] = INVALID_HANDLE_VALUE;
hd_err[1] = w32_open_null (1);
}
memset (&si, 0, sizeof si);
sca.allow_foreground_window = FALSE;
sca.hd[0] = hd_in[0];
sca.hd[1] = hd_out[1];
sca.hd[2] = hd_err[1];
sca.inherit_hds = NULL;
sca.arg = spawn_cb_arg;
if (spawn_cb)
(*spawn_cb) (&sca);
i = 0;
if (sca.hd[0] != INVALID_HANDLE_VALUE)
i++;
if (sca.hd[1] != INVALID_HANDLE_VALUE)
i++;
if (sca.hd[2] != INVALID_HANDLE_VALUE)
i++;
if (i != 0 || sca.inherit_hds)
{
SIZE_T attr_list_size = 0;
HANDLE hd[16];
HANDLE *hd_p = sca.inherit_hds;
int j = 0;
if (sca.hd[0] != INVALID_HANDLE_VALUE)
hd[j++] = sca.hd[0];
if (sca.hd[1] != INVALID_HANDLE_VALUE)
hd[j++] = sca.hd[1];
if (sca.hd[1] != INVALID_HANDLE_VALUE)
hd[j++] = sca.hd[2];
if (hd_p)
{
while (*hd_p != INVALID_HANDLE_VALUE)
if (j < DIM (hd))
hd[j++] = *hd_p++;
else
{
log_error ("Too much handles\n");
break;
}
}
if (j)
{
if (check_windows_version ())
{
InitializeProcThreadAttributeList (NULL, 1, 0, &attr_list_size);
si.lpAttributeList = xtrymalloc (attr_list_size);
if (si.lpAttributeList == NULL)
{
if ((flags & GNUPG_PROCESS_STDIN_PIPE)
|| !(flags & GNUPG_PROCESS_STDIN_KEEP))
CloseHandle (hd_in[0]);
if ((flags & GNUPG_PROCESS_STDIN_PIPE))
CloseHandle (hd_in[1]);
if ((flags & GNUPG_PROCESS_STDOUT_PIPE))
CloseHandle (hd_out[0]);
if ((flags & GNUPG_PROCESS_STDOUT_PIPE)
|| !(flags & GNUPG_PROCESS_STDOUT_KEEP))
CloseHandle (hd_out[1]);
if ((flags & GNUPG_PROCESS_STDERR_PIPE))
CloseHandle (hd_err[0]);
if ((flags & GNUPG_PROCESS_STDERR_PIPE)
|| !(flags & GNUPG_PROCESS_STDERR_KEEP))
CloseHandle (hd_err[1]);
xfree (process);
xfree (cmdline);
return gpg_err_code_from_syserror ();
}
InitializeProcThreadAttributeList (si.lpAttributeList, 1, 0,
&attr_list_size);
UpdateProcThreadAttribute (si.lpAttributeList, 0,
PROC_THREAD_ATTRIBUTE_HANDLE_LIST,
hd, sizeof (HANDLE) * j, NULL, NULL);
}
ask_inherit = TRUE;
}
}
/* Prepare security attributes. */
memset (&sec_attr, 0, sizeof sec_attr );
sec_attr.nLength = sizeof sec_attr;
sec_attr.bInheritHandle = FALSE;
/* Start the process. */
si.StartupInfo.cb = sizeof (si);
si.StartupInfo.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
si.StartupInfo.wShowWindow = DEBUG_W32_SPAWN? SW_SHOW : SW_HIDE;
si.StartupInfo.hStdInput = sca.hd[0];
si.StartupInfo.hStdOutput = sca.hd[1];
si.StartupInfo.hStdError = sca.hd[2];
/* log_debug ("CreateProcess, path='%s' cmdline='%s'\n", pgmname, cmdline); */
cr_flags = (CREATE_DEFAULT_ERROR_MODE
| GetPriorityClass (GetCurrentProcess ())
| CREATE_SUSPENDED);
if (!(wpgmname = utf8_to_wchar (pgmname)))
ret = 0;
else if (!(wcmdline = utf8_to_wchar (cmdline)))
ret = 0;
else
ret = CreateProcessW (wpgmname, /* Program to start. */
wcmdline, /* Command line arguments. */
&sec_attr, /* Process security attributes. */
&sec_attr, /* Thread security attributes. */
ask_inherit, /* Inherit handles. */
cr_flags, /* Creation flags. */
NULL, /* Environment. */
NULL, /* Use current drive/directory. */
(STARTUPINFOW *)&si, /* Startup information. */
&pi /* Returns process information. */
);
if (!ret)
{
if (!wpgmname || !wcmdline)
log_error ("CreateProcess failed (utf8_to_wchar): %s\n",
strerror (errno));
else
log_error ("CreateProcess failed: ec=%d\n",
(int)GetLastError ());
if ((flags & GNUPG_PROCESS_STDIN_PIPE)
|| !(flags & GNUPG_PROCESS_STDIN_KEEP))
CloseHandle (hd_in[0]);
if ((flags & GNUPG_PROCESS_STDIN_PIPE))
CloseHandle (hd_in[1]);
if ((flags & GNUPG_PROCESS_STDOUT_PIPE))
CloseHandle (hd_out[0]);
if ((flags & GNUPG_PROCESS_STDOUT_PIPE)
|| !(flags & GNUPG_PROCESS_STDOUT_KEEP))
CloseHandle (hd_out[1]);
if ((flags & GNUPG_PROCESS_STDERR_PIPE))
CloseHandle (hd_err[0]);
if ((flags & GNUPG_PROCESS_STDERR_PIPE)
|| !(flags & GNUPG_PROCESS_STDERR_KEEP))
CloseHandle (hd_err[1]);
xfree (wpgmname);
xfree (wcmdline);
xfree (process);
xfree (cmdline);
return GPG_ERR_GENERAL;
}
if (si.lpAttributeList)
DeleteProcThreadAttributeList (si.lpAttributeList);
xfree (wpgmname);
xfree (wcmdline);
xfree (cmdline);
if ((flags & GNUPG_PROCESS_STDIN_PIPE)
|| !(flags & GNUPG_PROCESS_STDIN_KEEP))
CloseHandle (hd_in[0]);
if ((flags & GNUPG_PROCESS_STDOUT_PIPE)
|| !(flags & GNUPG_PROCESS_STDOUT_KEEP))
CloseHandle (hd_out[1]);
if ((flags & GNUPG_PROCESS_STDERR_PIPE)
|| !(flags & GNUPG_PROCESS_STDERR_KEEP))
CloseHandle (hd_err[1]);
/* log_debug ("CreateProcess ready: hProcess=%p hThread=%p" */
/* " dwProcessID=%d dwThreadId=%d\n", */
/* pi.hProcess, pi.hThread, */
/* (int) pi.dwProcessId, (int) pi.dwThreadId); */
if (sca.allow_foreground_window)
{
/* Fixme: For unknown reasons AllowSetForegroundWindow returns
* an invalid argument error if we pass it the correct
* processID. As a workaround we use -1 (ASFW_ANY). */
if (!AllowSetForegroundWindow (ASFW_ANY /*pi.dwProcessId*/))
log_info ("AllowSetForegroundWindow() failed: ec=%d\n",
(int)GetLastError ());
}
/* Process has been created suspended; resume it now. */
pre_syscall ();
ResumeThread (pi.hThread);
CloseHandle (pi.hThread);
post_syscall ();
process->hProcess = pi.hProcess;
process->hd_in = hd_in[1];
process->hd_out = hd_out[0];
process->hd_err = hd_err[0];
process->exitcode = -1;
process->terminated = 0;
if (r_process == NULL)
{
ec = gnupg_process_wait (process, 1);
gnupg_process_release (process);
return ec;
}
*r_process = process;
return 0;
}
gpg_err_code_t
gnupg_process_get_fds (gnupg_process_t process, unsigned int flags,
int *r_fd_in, int *r_fd_out, int *r_fd_err)
{
(void)flags;
if (r_fd_in)
{
*r_fd_in = _open_osfhandle ((intptr_t)process->hd_in, O_APPEND);
process->hd_in = INVALID_HANDLE_VALUE;
}
if (r_fd_out)
{
*r_fd_out = _open_osfhandle ((intptr_t)process->hd_out, O_RDONLY);
process->hd_out = INVALID_HANDLE_VALUE;
}
if (r_fd_err)
{
*r_fd_err = _open_osfhandle ((intptr_t)process->hd_err, O_RDONLY);
process->hd_err = INVALID_HANDLE_VALUE;
}
return 0;
}
gpg_err_code_t
gnupg_process_get_streams (gnupg_process_t process, unsigned int flags,
estream_t *r_fp_in, estream_t *r_fp_out,
estream_t *r_fp_err)
{
int nonblock = (flags & GNUPG_PROCESS_STREAM_NONBLOCK)? 1: 0;
es_syshd_t syshd;
syshd.type = ES_SYSHD_HANDLE;
if (r_fp_in)
{
syshd.u.handle = process->hd_in;
*r_fp_in = es_sysopen (&syshd, nonblock? "w,nonblock" : "w");
process->hd_in = INVALID_HANDLE_VALUE;
}
if (r_fp_out)
{
syshd.u.handle = process->hd_out;
*r_fp_out = es_sysopen (&syshd, nonblock? "r,nonblock" : "r");
process->hd_out = INVALID_HANDLE_VALUE;
}
if (r_fp_err)
{
syshd.u.handle = process->hd_err;
*r_fp_err = es_sysopen (&syshd, nonblock? "r,nonblock" : "r");
process->hd_err = INVALID_HANDLE_VALUE;
}
return 0;
}
static gpg_err_code_t
process_kill (gnupg_process_t process, unsigned int exitcode)
{
gpg_err_code_t ec = 0;
pre_syscall ();
if (TerminateProcess (process->hProcess, exitcode))
ec = gpg_err_code_from_syserror ();
post_syscall ();
return ec;
}
static gpg_err_code_t
process_vctl (gnupg_process_t process, unsigned int request, va_list arg_ptr)
{
switch (request)
{
case GNUPG_PROCESS_NOP:
return 0;
case GNUPG_PROCESS_GET_PROC_ID:
{
int *r_id = va_arg (arg_ptr, int *);
if (r_id == NULL)
return GPG_ERR_INV_VALUE;
*r_id = (int)GetProcessId (process->hProcess);
return 0;
}
case GNUPG_PROCESS_GET_EXIT_ID:
{
int *r_exit_status = va_arg (arg_ptr, int *);
unsigned long exit_code;
*r_exit_status = -1;
if (!process->terminated)
return GPG_ERR_UNFINISHED;
if (process->hProcess == INVALID_HANDLE_VALUE)
return 0;
if (GetExitCodeProcess (process->hProcess, &exit_code) == 0)
return gpg_err_code_from_syserror ();
*r_exit_status = (int)exit_code;
return 0;
}
case GNUPG_PROCESS_GET_P_HANDLE:
{
HANDLE *r_hProcess = va_arg (arg_ptr, HANDLE *);
if (r_hProcess == NULL)
return GPG_ERR_INV_VALUE;
*r_hProcess = process->hProcess;
process->hProcess = INVALID_HANDLE_VALUE;
return 0;
}
case GNUPG_PROCESS_GET_HANDLES:
{
HANDLE *r_hd_in = va_arg (arg_ptr, HANDLE *);
HANDLE *r_hd_out = va_arg (arg_ptr, HANDLE *);
HANDLE *r_hd_err = va_arg (arg_ptr, HANDLE *);
if (r_hd_in)
{
*r_hd_in = process->hd_in;
process->hd_in = INVALID_HANDLE_VALUE;
}
if (r_hd_out)
{
*r_hd_out = process->hd_out;
process->hd_out = INVALID_HANDLE_VALUE;
}
if (r_hd_err)
{
*r_hd_err = process->hd_err;
process->hd_err = INVALID_HANDLE_VALUE;
}
return 0;
}
case GNUPG_PROCESS_GET_EXIT_CODE:
{
unsigned long *r_exitcode = va_arg (arg_ptr, unsigned long *);
if (!process->terminated)
return GPG_ERR_UNFINISHED;
if (process->hProcess == INVALID_HANDLE_VALUE)
{
*r_exitcode = (unsigned long)-1;
return 0;
}
if (GetExitCodeProcess (process->hProcess, r_exitcode) == 0)
return gpg_err_code_from_syserror ();
return 0;
}
case GNUPG_PROCESS_KILL_WITH_EC:
{
unsigned int exitcode = va_arg (arg_ptr, unsigned int);
if (process->terminated)
return 0;
if (process->hProcess == INVALID_HANDLE_VALUE)
return 0;
return process_kill (process, exitcode);
}
default:
break;
}
return GPG_ERR_UNKNOWN_COMMAND;
}
gpg_err_code_t
gnupg_process_ctl (gnupg_process_t process, unsigned int request, ...)
{
va_list arg_ptr;
gpg_err_code_t ec;
va_start (arg_ptr, request);
ec = process_vctl (process, request, arg_ptr);
va_end (arg_ptr);
return ec;
}
gpg_err_code_t
gnupg_process_wait (gnupg_process_t process, int hang)
{
gpg_err_code_t ec;
int code;
if (process->hProcess == INVALID_HANDLE_VALUE)
return 0;
pre_syscall ();
code = WaitForSingleObject (process->hProcess, hang? INFINITE : 0);
post_syscall ();
switch (code)
{
case WAIT_TIMEOUT:
ec = GPG_ERR_TIMEOUT; /* Still running. */
break;
case WAIT_FAILED:
log_error (_("waiting for process to terminate failed: ec=%d\n"),
(int)GetLastError ());
ec = GPG_ERR_GENERAL;
break;
case WAIT_OBJECT_0:
process->terminated = 1;
ec = 0;
break;
default:
log_debug ("WaitForSingleObject returned unexpected code %d\n", code);
ec = GPG_ERR_GENERAL;
break;
}
return ec;
}
gpg_err_code_t
gnupg_process_terminate (gnupg_process_t process)
{
return process_kill (process, 1);
}
void
gnupg_process_release (gnupg_process_t process)
{
if (!process)
return;
if (process->terminated)
{
gnupg_process_terminate (process);
gnupg_process_wait (process, 1);
}
CloseHandle (process->hProcess);
xfree (process);
}
gpg_err_code_t
gnupg_process_wait_list (gnupg_process_t *process_list, int count, int hang)
{
gpg_err_code_t ec = 0;
int i;
for (i = 0; i < count; i++)
{
if (process_list[i]->terminated)
continue;
ec = gnupg_process_wait (process_list[i], hang);
if (ec)
break;
}
return ec;
}
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