Git initHEAD2.0_alphamaster2.0alpha1.0_post

1 files changed, 225 insertions, 0 deletions

diff --git a/cipher/rndegd.c b/cipher/rndegd.c
new file mode 100644
index 0000000..e6646a2
--- /dev/null
+++ b/cipher/rndegd.c
@@ -0,0 +1,225 @@
+/* rndegd.c  -	interface to the EGD
+ *	Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG 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.
+ *
+ * GnuPG 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+ * USA.
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <errno.h>
+#include <sys/time.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include "types.h"
+#include "util.h"
+#include "ttyio.h"
+#include "algorithms.h"
+#include "cipher.h"
+#include "i18n.h"
+
+
+#ifndef offsetof
+#define offsetof(type, member) ((size_t) &((type *)0)->member)
+#endif
+
+static int egd_socket = -1;
+
+static int
+do_write( int fd, void *buf, size_t nbytes )
+{
+    size_t nleft = nbytes;
+    int nwritten;
+
+    while( nleft > 0 ) {
+	nwritten = write( fd, buf, nleft);
+	if( nwritten < 0 ) {
+	    if( errno == EINTR )
+		continue;
+	    return -1;
+	}
+	nleft -= nwritten;
+	buf = (char*)buf + nwritten;
+    }
+    return 0;
+}
+
+static int
+do_read( int fd, void *buf, size_t nbytes )
+{
+  int n, nread = 0;
+  
+  while (nbytes)
+    {
+      do {
+        n = read(fd, (char*)buf + nread, nbytes );
+      } while( n == -1 && errno == EINTR );
+      if( n == -1 )
+        return nread? nread:-1;
+      else if( n == 0 ) {
+        /* EGD probably died. */
+        errno = ECONNRESET;
+        return -1;
+      }
+      nread += n;
+      nbytes -= n;
+    } 
+  return nread;
+}
+
+/* Connect to the EGD and return the file descriptor.  Return -1 on
+   error.  With NOFAIL set to true, silently fail and return the
+   error, otherwise print an error message and die. */
+int
+rndegd_connect_socket (int nofail)
+{
+  int fd;
+  const char *bname = NULL;
+  char *name;
+  struct sockaddr_un addr;
+  int addr_len;
+
+  if (egd_socket != -1)
+    {
+      close (egd_socket);
+      egd_socket = -1;
+    }
+
+#ifdef EGD_SOCKET_NAME
+  bname = EGD_SOCKET_NAME;
+#endif
+  if ( !bname || !*bname )
+    bname = "=entropy";
+  
+  if ( *bname == '=' && bname[1] )
+    name = make_filename( g10_opt_homedir, bname+1 , NULL );
+  else
+    name = make_filename( bname , NULL );
+  
+  if ( strlen(name)+1 >= sizeof addr.sun_path ) 
+    g10_log_fatal ("EGD socketname is too long\n");
+  
+  memset( &addr, 0, sizeof addr );
+  addr.sun_family = AF_UNIX;
+  strcpy( addr.sun_path, name );	  
+  addr_len = (offsetof( struct sockaddr_un, sun_path )
+              + strlen( addr.sun_path ));
+  
+  fd = socket(AF_UNIX, SOCK_STREAM, 0);
+  if (fd == -1 && !nofail)
+    g10_log_fatal("can't create unix domain socket: %s\n",
+                  strerror(errno) );
+  else if (connect (fd, (struct sockaddr*)&addr, addr_len) == -1)
+    {
+      if (!nofail)
+        g10_log_fatal("can't connect to `%s': %s\n",
+                      name, strerror(errno) );
+      close (fd);
+      fd = -1;
+    }
+  xfree(name);
+  if (fd != -1)
+    egd_socket = fd;
+  return fd;
+}
+
+
+/****************
+ * Note: we always use the highest level.
+ * TO boost the performance we may want to add some
+ * additional code for level 1
+ *
+ * Using a level of 0 should never block and better add nothing
+ * to the pool.  So this is just a dummy for EGD.
+ */
+int
+rndegd_gather_random( void (*add)(const void*, size_t, int), int requester,
+					  size_t length, int level )
+{
+    int fd = egd_socket;
+    int n;
+    byte buffer[256+2];
+    int nbytes;
+    int do_restart = 0;
+
+    if( !length )
+	return 0;
+    if( !level )
+	return 0;
+
+  restart:
+    if (fd == -1 || do_restart)
+      fd = rndegd_connect_socket (0);
+
+    do_restart = 0;
+
+    nbytes = length < 255? length : 255;
+    /* first time we do it with a non blocking request */
+    buffer[0] = 1; /* non blocking */
+    buffer[1] = nbytes;
+    if( do_write( fd, buffer, 2 ) == -1 )
+	g10_log_fatal("can't write to the EGD: %s\n", strerror(errno) );
+    n = do_read( fd, buffer, 1 );
+    if( n == -1 ) {
+	g10_log_error("read error on EGD: %s\n", strerror(errno));
+	do_restart = 1;
+	goto restart;
+    }
+    n = buffer[0];
+    if( n ) {
+	n = do_read( fd, buffer, n );
+	if( n == -1 ) {
+	    g10_log_error("read error on EGD: %s\n", strerror(errno));
+	    do_restart = 1;
+	    goto restart;
+	}
+	(*add)( buffer, n, requester );
+	length -= n;
+    }
+
+    if( length ) {
+	tty_printf(
+	 _("Please wait, entropy is being gathered. Do some work if it would\n"
+	   "keep you from getting bored, because it will improve the quality\n"
+	   "of the entropy.\n") );
+    }
+    while( length ) {
+	nbytes = length < 255? length : 255;
+
+	buffer[0] = 2; /* blocking */
+	buffer[1] = nbytes;
+	if( do_write( fd, buffer, 2 ) == -1 )
+	    g10_log_fatal("can't write to the EGD: %s\n", strerror(errno) );
+	n = do_read( fd, buffer, nbytes );
+	if( n == -1 ) {
+	    g10_log_error("read error on EGD: %s\n", strerror(errno));
+	    do_restart = 1;
+	    goto restart;
+	}
+	(*add)( buffer, n, requester );
+	length -= n;
+    }
+    wipememory(buffer, sizeof(buffer) );
+
+    return 0; /* success */
+}