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/* exechelp.c - fork and exec helpers
* Copyright (C) 2004, 2007, 2014 g10 Code GmbH
* Copyright (C) 2015 by Bundesamt für Sicherheit in der Informationstechnik
* Software engineering by Intevation GmbH
*
* This file is part of GpgOL.
*
* GpgOL is free software; you can redistribute it and/or modify
* it under the terms of 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.
*
* GpgOL 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <windows.h>
#include <gpg-error.h>
#include "common.h"
#include "exechelp.h"
/* Define to 1 do enable debugging. */
#define DEBUG_W32_SPAWN 0
/* Lock a spawning process. The caller needs to provide the address
of a variable to store the lock information and the name or the
process. */
gpg_error_t
gpgol_lock_spawning (lock_spawn_t *lock)
{
int waitrc;
int timeout = 5;
*lock = CreateMutexW (NULL, FALSE, L"spawn_gnupg_uiserver_sentinel");
if (!*lock)
{
log_error ("failed to create the spawn mutex: rc=%ld", GetLastError ());
return gpg_error (GPG_ERR_GENERAL);
}
retry:
waitrc = WaitForSingleObject (*lock, 1000);
if (waitrc == WAIT_OBJECT_0)
return 0;
if (waitrc == WAIT_TIMEOUT && timeout)
{
timeout--;
goto retry;
}
if (waitrc == WAIT_TIMEOUT)
log_error ("error waiting for the spawn mutex: timeout");
else
log_error ("error waiting for the spawn mutex: (code=%d) rc=%ld",
waitrc, GetLastError ());
return gpg_error (GPG_ERR_GENERAL);
}
/* Unlock the spawning process. */
void
gpgol_unlock_spawning (lock_spawn_t *lock)
{
if (*lock)
{
if (!ReleaseMutex (*lock))
log_error ("failed to release the spawn mutex: rc=%ld", GetLastError());
CloseHandle (*lock);
*lock = NULL;
}
}
/* Fork and exec the program with /dev/null as stdin, stdout and
stderr. Returns 0 on success or an error code. */
gpg_error_t
gpgol_spawn_detached (const char *cmdline)
{
SECURITY_ATTRIBUTES sec_attr;
PROCESS_INFORMATION pi =
{
NULL, /* Returns process handle. */
0, /* Returns primary thread handle. */
0, /* Returns pid. */
0 /* Returns tid. */
};
STARTUPINFO si;
int cr_flags;
log_debug ("gpgol_spawn_detached cmdline=%s", cmdline);
/* Prepare security attributes. */
memset (&sec_attr, 0, sizeof sec_attr);
sec_attr.nLength = sizeof sec_attr;
sec_attr.bInheritHandle = FALSE;
/* Start the process. Note that we can't run the PREEXEC function
because this would change our own environment. */
memset (&si, 0, sizeof si);
si.cb = sizeof (si);
si.dwFlags = STARTF_USESHOWWINDOW;
si.wShowWindow = DEBUG_W32_SPAWN ? SW_SHOW : SW_MINIMIZE;
cr_flags = (CREATE_DEFAULT_ERROR_MODE
| GetPriorityClass (GetCurrentProcess ())
| CREATE_NEW_PROCESS_GROUP
| DETACHED_PROCESS);
if (!CreateProcess (NULL, /* pgmname; Program to start. */
(char *) cmdline, /* Command line arguments. */
&sec_attr, /* Process security attributes. */
&sec_attr, /* Thread security attributes. */
TRUE, /* Inherit handles. */
cr_flags, /* Creation flags. */
NULL, /* Environment. */
NULL, /* Use current drive/directory. */
&si, /* Startup information. */
&pi /* Returns process information. */
))
{
log_error ("CreateProcess failed: %ld\n", GetLastError ());
return gpg_error (GPG_ERR_GENERAL);
}
/* Process has been created suspended; resume it now. */
CloseHandle (pi.hThread);
CloseHandle (pi.hProcess);
return 0;
}

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