1 files changed, 290 insertions, 0 deletions
diff --git a/libgcrypt-1.4.6/random/rndegd.c b/libgcrypt-1.4.6/random/rndegd.c
new file mode 100644
index 0000000..63a5e0f
--- /dev/null
+++ b/libgcrypt-1.4.6/random/rndegd.c
@@ -0,0 +1,290 @@
+/* rndegd.c  -	interface to the EGD
+ *	Copyright (C) 1999, 2000, 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 <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 "g10lib.h"
+#include "cipher.h"
+#include "rand-internal.h"
+
+#ifndef offsetof
+#define offsetof(type, member) ((size_t) &((type *)0)->member)
+#endif
+
+static int egd_socket = -1;
+
+/* Allocated name of the socket if supplied at runtime.  */
+static char *user_socket_name;
+
+
+/* Allocate a new filename from FIRST_PART and SECOND_PART and to
+   tilde expansion for first_part.  SECOND_PART might be NULL.
+ */
+static char *
+my_make_filename (const char *first_part, const char *second_part)
+{
+  size_t n;
+  char *name, *home, *p;
+
+  n = strlen(first_part)+1;
+  if (second_part)
+    n += strlen (second_part) + 1;
+
+  home = NULL;
+  if( *first_part == '~' && first_part[1] == '/'
+      && (home = getenv("HOME")) && *home )
+    n += strlen(home);
+
+  name = gcry_xmalloc(n);
+  p = (home
+       ? stpcpy (stpcpy (name, home), first_part+1 )
+       : stpcpy (name, first_part) );
+
+  if (second_part)
+    strcpy (stpcpy(p,"/"), second_part);
+
+  return name;
+}
+
+
+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;
+
+  do
+    {
+      do
+        {
+          n = read(fd, (char*)buf + nread, nbytes );
+        } 
+      while( n == -1 && errno == EINTR );
+      if( n == -1)
+        return nread? nread:-1;
+      if( n == 0)
+        return -1;
+      nread += n;
+      nbytes -= n;
+    } 
+  while( nread < nbytes );
+  return nread;
+}
+
+
+/* Note that his fucntion is not thread-safe.  */
+gpg_error_t
+_gcry_rndegd_set_socket_name (const char *name)
+{
+  char *newname;
+  struct sockaddr_un addr;
+
+  newname = my_make_filename (name, NULL);
+  if (strlen (newname)+1 >= sizeof addr.sun_path)
+    {
+      gcry_free (newname);
+      return gpg_error_from_syserror ();
+    }
+  gcry_free (user_socket_name);
+  user_socket_name = newname;
+  return 0;
+}
+
+
+/* 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
+_gcry_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 (user_socket_name)
+    {
+      name = gcry_strdup (user_socket_name);
+      if (!name)
+        {
+          if (!nofail)
+            log_fatal ("error allocating memory in rndegd: %s\n",
+                       strerror(errno) );
+          return -1;
+        }
+    }
+  else if ( !bname || !*bname )
+    name = my_make_filename ("~/.gnupg", "entropy");
+  else
+    name = my_make_filename (bname, NULL);
+
+  if (strlen(name)+1 >= sizeof addr.sun_path)
+    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)
+    log_fatal("can't create unix domain socket: %s\n", strerror(errno) );
+  else if (connect (fd, (struct sockaddr*)&addr, addr_len) == -1)
+    {
+      if (!nofail)
+        log_fatal("can't connect to EGD socket `%s': %s\n",
+		  name, strerror(errno) );
+      close (fd);
+      fd = -1;
+    }
+  gcry_free(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
+_gcry_rndegd_gather_random (void (*add)(const void*, size_t,
+                                        enum random_origins),
+                            enum random_origins origin,
+                            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 = _gcry_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 )
+    log_fatal("can't write to the EGD: %s\n", strerror(errno) );
+  n = do_read( fd, buffer, 1 );
+  if( n == -1 )
+    {
+      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 )
+        {
+          log_error("read error on EGD: %s\n", strerror(errno));
+          do_restart = 1;
+          goto restart;
+	}
+      (*add)( buffer, n, origin );
+      length -= n;
+    }
+
+  if( length )
+    {
+      log_info (
+      _("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 )
+        log_fatal("can't write to the EGD: %s\n", strerror(errno) );
+      n = do_read( fd, buffer, nbytes );
+      if( n == -1 )
+        {
+          log_error("read error on EGD: %s\n", strerror(errno));
+          do_restart = 1;
+          goto restart;
+	}
+      (*add)( buffer, n, origin );
+      length -= n;
+    }
+  memset(buffer, 0, sizeof(buffer) );
+
+  return 0; /* success */
+}