From eca49bb06a71980ef61d078904573f25890fc7f2 Mon Sep 17 00:00:00 2001
From: zautrix <zautrix>
Date: Tue, 19 Oct 2004 20:16:14 +0000
Subject: Initial revision

---
(limited to 'pwmanager/libcrypt/cipher/rndlinux.c')

diff --git a/pwmanager/libcrypt/cipher/rndlinux.c b/pwmanager/libcrypt/cipher/rndlinux.c
new file mode 100644
index 0000000..fc608bc
--- a/dev/null
+++ b/pwmanager/libcrypt/cipher/rndlinux.c
@@ -0,0 +1,141 @@
+/* rndlinux.c  -  raw random number for OSes with /dev/random
+ * Copyright (C) 1998, 2001, 2002, 2003  Free Software Foundation, Inc.
+ *
+ * This file is part of Libgcrypt.
+ *
+ * Libgcrypt is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * Libgcrypt 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser 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
+ */
+
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <errno.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#ifdef HAVE_GETTIMEOFDAY
+# include <sys/times.h>
+#endif
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include "types.h"
+#include "g10lib.h"
+#include "rand-internal.h"
+
+static int open_device( const char *name, int minor );
+int _gcry_rndlinux_gather_random (void (*add)(const void*, size_t, int),
+                                  int requester,
+                                  size_t length, int level );
+
+/*
+ * Used to open the /dev/random devices (Linux, xBSD, Solaris (if it exists)).
+ */
+static int
+open_device( const char *name, int minor )
+{
+  int fd;
+
+  fd = open( name, O_RDONLY );
+  if( fd == -1 )
+    log_fatal ("can't open %s: %s\n", name, strerror(errno) );
+
+  /* We used to do the follwing check, however it turned out that this
+     is not portable since more OSes provide a random device which is
+     sometimes implemented as anoteher device type. 
+     
+     struct stat sb;
+
+     if( fstat( fd, &sb ) )
+        log_fatal("stat() off %s failed: %s\n", name, strerror(errno) );
+     if( (!S_ISCHR(sb.st_mode)) && (!S_ISFIFO(sb.st_mode)) )
+        log_fatal("invalid random device!\n" );
+  */
+  return fd;
+}
+
+
+int
+_gcry_rndlinux_gather_random (void (*add)(const void*, size_t, int),
+                              int requester,
+                              size_t length, int level )
+{
+  static int fd_urandom = -1;
+  static int fd_random = -1;
+  int fd;
+  int n;
+  int warn=0;
+  byte buffer[768];
+
+  if( level >= 2 )
+    {
+      if( fd_random == -1 )
+        fd_random = open_device( NAME_OF_DEV_RANDOM, 8 );
+      fd = fd_random;
+    }
+  else
+    {
+      if( fd_urandom == -1 )
+        fd_urandom = open_device( NAME_OF_DEV_URANDOM, 9 );
+      fd = fd_urandom;
+    }
+
+  while (length)
+    {
+      fd_set rfds;
+      struct timeval tv;
+      int rc;
+      
+      FD_ZERO(&rfds);
+      FD_SET(fd, &rfds);
+      tv.tv_sec = 3;
+      tv.tv_usec = 0;
+      if( !(rc=select(fd+1, &rfds, NULL, NULL, &tv)) )
+        {
+          if( !warn )
+            {
+              _gcry_random_progress ("need_entropy", 'X', 0, (int)length);
+	      warn = 1;
+	    }
+	  continue;
+	}
+	else if( rc == -1 )
+          {
+	    log_error ("select() error: %s\n", strerror(errno));
+	    continue;
+          }
+
+	do 
+          {
+	    int nbytes = length < sizeof(buffer)? length : sizeof(buffer);
+	    n = read(fd, buffer, nbytes );
+	    if( n >= 0 && n > nbytes ) 
+              {
+		log_error("bogus read from random device (n=%d)\n", n );
+		n = nbytes;
+              }
+          } 
+        while( n == -1 && errno == EINTR );
+	if( n == -1 )
+          log_fatal("read error on random device: %s\n", strerror(errno));
+	(*add)( buffer, n, requester );
+	length -= n;
+    }
+  memset(buffer, 0, sizeof(buffer) );
+
+  return 0; /* success */
+}
--
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