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/* rndegd.c - interface to the EGD
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* Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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* This file is part of GnuPG.
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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#include <sys/types.h>
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#include <sys/socket.h>
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#include "algorithms.h"
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#define offsetof(type, member) ((size_t) &((type *)0)->member)
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static int egd_socket = -1;
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do_write( int fd, void *buf, size_t nbytes )
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size_t nleft = nbytes;
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nwritten = write( fd, buf, nleft);
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buf = (char*)buf + nwritten;
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do_read( int fd, void *buf, size_t nbytes )
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n = read(fd, (char*)buf + nread, nbytes );
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} while( n == -1 && errno == EINTR );
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return nread? nread:-1;
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/* EGD probably died. */
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/* Connect to the EGD and return the file descriptor. Return -1 on
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error. With NOFAIL set to true, silently fail and return the
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error, otherwise print an error message and die. */
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rndegd_connect_socket (int nofail)
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const char *bname = NULL;
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struct sockaddr_un addr;
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if (egd_socket != -1)
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#ifdef EGD_SOCKET_NAME
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bname = EGD_SOCKET_NAME;
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if ( !bname || !*bname )
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if ( *bname == '=' && bname[1] )
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name = make_filename( g10_opt_homedir, bname+1 , NULL );
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name = make_filename( bname , NULL );
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if ( strlen(name)+1 >= sizeof addr.sun_path )
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g10_log_fatal ("EGD socketname is too long\n");
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memset( &addr, 0, sizeof addr );
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addr.sun_family = AF_UNIX;
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strcpy( addr.sun_path, name );
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addr_len = (offsetof( struct sockaddr_un, sun_path )
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+ strlen( addr.sun_path ));
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fd = socket(AF_UNIX, SOCK_STREAM, 0);
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if (fd == -1 && !nofail)
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g10_log_fatal("can't create unix domain socket: %s\n",
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else if (connect (fd, (struct sockaddr*)&addr, addr_len) == -1)
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g10_log_fatal("can't connect to `%s': %s\n",
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name, strerror(errno) );
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* Note: we always use the highest level.
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* TO boost the performance we may want to add some
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* additional code for level 1
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* Using a level of 0 should never block and better add nothing
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* to the pool. So this is just a dummy for EGD.
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rndegd_gather_random( void (*add)(const void*, size_t, int), int requester,
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size_t length, int level )
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if (fd == -1 || do_restart)
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fd = rndegd_connect_socket (0);
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nbytes = length < 255? length : 255;
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/* first time we do it with a non blocking request */
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buffer[0] = 1; /* non blocking */
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if( do_write( fd, buffer, 2 ) == -1 )
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g10_log_fatal("can't write to the EGD: %s\n", strerror(errno) );
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n = do_read( fd, buffer, 1 );
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g10_log_error("read error on EGD: %s\n", strerror(errno));
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n = do_read( fd, buffer, n );
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g10_log_error("read error on EGD: %s\n", strerror(errno));
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(*add)( buffer, n, requester );
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_("Please wait, entropy is being gathered. Do some work if it would\n"
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"keep you from getting bored, because it will improve the quality\n"
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"of the entropy.\n") );
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nbytes = length < 255? length : 255;
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buffer[0] = 2; /* blocking */
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if( do_write( fd, buffer, 2 ) == -1 )
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g10_log_fatal("can't write to the EGD: %s\n", strerror(errno) );
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n = do_read( fd, buffer, nbytes );
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g10_log_error("read error on EGD: %s\n", strerror(errno));
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(*add)( buffer, n, requester );
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memset(buffer, 0, sizeof(buffer) );
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return 0; /* success */
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#endif /*USE_RNDEGD*/
added
removed
cipher/rndegd.c
