See ChangeLog: Mon Feb 22 20:04:00 CET 1999 Werner Koch

cipher/rndegd.c

@@ -0,0 +1,205 @@
+/* rndegd.c  -	interface to the EGD
+ *	Copyright (C) 1999 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., 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>
+#include <string.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include "types.h"
+#include "util.h"
+#include "ttyio.h"
+#include "dynload.h"
+
+#ifdef IS_MODULE
+  #define _(a) (a)
+#else
+  #include "i18n.h"
+#endif
+
+static int gather_random( void (*add)(const void*, size_t, int), int requester,
+					  size_t length, int level );
+
+#ifdef IS_MODULE
+static void tty_printf(const char *fmt, ... )
+{
+    g10_log_info("tty_printf not available (%s)\n", fmt );
+}
+#endif
+
+
+static int
+do_write( int fd, void *buf, size_t nbytes )
+{
+    size_t nleft = nbytes;
+    ssize_t 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;
+}
+
+    my $bytes = shift;
+    $msg = pack("CC", 0x01, $bytes);
+    $s->syswrite($msg, length($msg));
+    my $nread = $s->sysread($buf, 1);
+    die unless $nread == 1;
+    my $count = unpack("C",$buf);
+    $nread = $s->sysread($buf, $count);
+    die "didn't get all the entropy" unless $nread == $count;
+    print "got $count bytes of entropy: ",unpack("H*",$buf),"\n";
+
+
+
+
+static int
+gather_random( void (*add)(const void*, size_t, int), int requester,
+					  size_t length, int level )
+{
+    static int fd = -1;
+    int n;
+    int warn=0;
+    byte buffer[768];
+
+    if( fd == -1 ) {
+	const char *name = "/tmp/entropy";
+	struct sockaddr_un addr;
+	int addr_len;
+
+	memset( &addr, 0, sizeof addr );
+	addr.sun_family = AF_UNIX;
+	strcpy( addr.sun_path, name );	  /* fixme: check that it is long enough */
+	addr_len = strlen(addr.sun_path) + sizeof addr.sun_family;
+
+	fd = socket(AF_UNIX, SOCK_STREAM, 0);
+	if( fd == -1 )
+	    g10_log_fatal("can't create unix domain socket: %s\n",
+							    strerror(errno) );
+	if( connect( fd, (struct sockaddr*)&addr, addr_len) == -1 )
+	    g10_log_fatal("can't connect to `%s': %s\n",
+						    name, strerror(errno) );
+    }
+
+    if( do_write( fd, "\x01", 1 ) == -1 )
+	g10_log_fatal("can't write to the EGD: %s\n", strerror(errno) );
+
+    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 )
+		tty_printf( _(
+"\n"
+"Not enough random bytes available.  Please do some other work to give\n"
+"the OS a chance to collect more entropy! (Need %d more bytes)\n"), length );
+	    warn = 0; /* set to 1 to print onyl one warning */
+	    continue;
+	}
+	else if( rc == -1 ) {
+	    tty_printf("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 ) {
+		g10_log_error("bogus read from random device (n=%d)\n", n );
+		n = nbytes;
+	    }
+	} while( n == -1 && errno == EINTR );
+	if( n == -1 )
+	    g10_log_fatal("read error on EGD: %s\n", strerror(errno));
+	(*add)( buffer, n, requester );
+	length -= n;
+    }
+    memset(buffer, 0, sizeof(buffer) );
+
+    return 0; /* success */
+}
+
+
+
+#ifndef IS_MODULE
+static
+#endif
+const char * const gnupgext_version = "RNDEGD ($Revision$)";
+
+static struct {
+    int class;
+    int version;
+    void *func;
+} func_table[] = {
+    { 40, 1, gather_random },
+};
+
+
+#ifndef IS_MODULE
+static
+#endif
+void *
+gnupgext_enum_func( int what, int *sequence, int *class, int *vers )
+{
+    void *ret;
+    int i = *sequence;
+
+    do {
+	if ( i >= DIM(func_table) || i < 0 ) {
+	    return NULL;
+	}
+	*class = func_table[i].class;
+	*vers  = func_table[i].version;
+	ret = func_table[i].func;
+	i++;
+    } while ( what && what != *class );
+
+    *sequence = i;
+    return ret;
+}
+
+#ifndef IS_MODULE
+void
+rndegd_constructor(void)
+{
+    register_internal_cipher_extension( gnupgext_version,
+					gnupgext_enum_func );
+}
+#endif
+