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path: root/pwmanager/libcrypt/cipher/rndegd.c
authorzautrix <zautrix>2004-10-19 20:16:14 (UTC)
committer zautrix <zautrix>2004-10-19 20:16:14 (UTC)
commiteca49bb06a71980ef61d078904573f25890fc7f2 (patch) (side-by-side diff)
treec5338e3b12430248979a9ac2c1c7e6646ea9ecdf /pwmanager/libcrypt/cipher/rndegd.c
parent53cc32b6e7b1f672bf91b2baf2df6c1e8baf3e0a (diff)
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Initial revision
Diffstat (limited to 'pwmanager/libcrypt/cipher/rndegd.c') (more/less context) (ignore whitespace changes)
-rw-r--r--pwmanager/libcrypt/cipher/rndegd.c256
1 files changed, 256 insertions, 0 deletions
diff --git a/pwmanager/libcrypt/cipher/rndegd.c b/pwmanager/libcrypt/cipher/rndegd.c
new file mode 100644
index 0000000..29b48e8
--- a/dev/null
+++ b/pwmanager/libcrypt/cipher/rndegd.c
@@ -0,0 +1,256 @@
+/* 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 <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 "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;
+
+/* 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;
+}
+
+
+/* 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 ( !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, 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 = _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, requester );
+ 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, requester );
+ length -= n;
+ }
+ memset(buffer, 0, sizeof(buffer) );
+
+ return 0; /* success */
+}