* Makefile.in: Add dependencies for fhandler_random.o

        * fhandler.h: Add device type FH_RANDOM. Add class
        fhandler_dev_random.
        * fhandler_random.cc: New file. Implementation of
        fhandler_dev_random.
        * hinfo.cc (build_fhandler): Add case for FH_RANDOM.
        * path.cc: Add device names for random devices to
        windows_device_names.
        (get_device_number): Add if branch for random devices.
        (win32_device_name): Add device name generation for
        random devices.
        winsup.h: Include <wincrypt.h>.

1 files changed, 92 insertions, 0 deletions

diff --git a/winsup/cygwin/fhandler_random.cc b/winsup/cygwin/fhandler_random.cc
new file mode 100644
index 000000000..6ea72fa0d
--- /dev/null
+++ b/winsup/cygwin/fhandler_random.cc
@@ -0,0 +1,92 @@
+/* fhandler_dev_random.cc: code to access /dev/random
+
+   Copyright 2000 Cygnus Solutions.
+
+   Written by Corinna Vinschen (vinschen@cygnus.com)
+
+This file is part of Cygwin.
+
+This software is a copyrighted work licensed under the terms of the
+Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
+details. */
+
+#include <errno.h>
+#include "winsup.h"
+
+#define RANDOM   8
+#define URANDOM  9
+
+fhandler_dev_random::fhandler_dev_random (const char *name, int nunit)
+  : fhandler_base (FH_RANDOM, name),
+    unit(nunit),
+    crypt_prov((HCRYPTPROV)NULL)
+{
+  set_cb (sizeof *this);
+}
+
+int
+fhandler_dev_random::open (const char *, int flags, mode_t)
+{
+  set_flags (flags);
+  return 1;
+}
+
+int
+fhandler_dev_random::write (const void *, size_t len)
+{
+  return len;
+}
+
+int
+fhandler_dev_random::read (void *ptr, size_t len)
+{
+  if (!len)
+    return 0;
+  if (!crypt_prov
+      && !CryptAcquireContext (&crypt_prov, NULL, MS_DEF_PROV,
+                            PROV_RSA_FULL, 0)
+      && !CryptAcquireContext (&crypt_prov, NULL, MS_DEF_PROV,
+                               PROV_RSA_FULL, CRYPT_NEWKEYSET))
+    {
+      __seterrno ();
+      return -1;
+    }
+  if (!CryptGenRandom (crypt_prov, len, (BYTE *)ptr))
+    {
+      __seterrno ();
+      return -1;
+    }
+  return len;
+}
+
+off_t
+fhandler_dev_random::lseek (off_t, int)
+{
+  return 0;
+}
+
+int
+fhandler_dev_random::close (void)
+{
+  if (crypt_prov)
+    while (!CryptReleaseContext (crypt_prov, 0)
+           && GetLastError () == ERROR_BUSY)
+      Sleep(10);
+  return 0;
+}
+
+int
+fhandler_dev_random::dup (fhandler_base *child)
+{
+  fhandler_dev_random *fhr = (fhandler_dev_random *) child;
+  fhr->unit = unit;
+  fhr->crypt_prov = (HCRYPTPROV)NULL;
+  return 0;
+}
+
+void
+fhandler_dev_random::dump ()
+{
+  paranoid_printf("here, fhandler_dev_random");
+}
+