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/* 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/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 "dynload.h"
#ifdef IS_MODULE
#define _(a) (a)
#else
#include "i18n.h"
#endif
#ifndef offsetof
#define offsetof(type, member) ((size_t) &((type *)0)->member)
#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;
}
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[256+2];
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 = offsetof( struct sockaddr_un, sun_path )
+ strlen( addr.sun_path );
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) );
}
while( length ) {
fd_set rfds;
struct timeval tv;
int rc;
int nbytes;
int cmd;
nbytes = length < 255? length : 255;
/* send request */
cmd = level >= 2 ? 2 : 1;
buffer[0] = cmd;
buffer[1] = nbytes;
if( do_write( fd, buffer, 2 ) == -1 )
g10_log_fatal("can't write to the EGD: %s\n", strerror(errno) );
/* wait on reply */
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 )
#ifdef IS_MODULE
fprintf( stderr,
#else
tty_printf(
#endif
_(
"\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 = 1;
continue;
}
else if( rc == -1 ) {
g10_log_error("select error on EGD: %s\n", strerror(errno));
continue;
}
/* collect reply */
do {
n = read(fd, buffer, nbytes+2 );
} while( n == -1 && errno == EINTR );
/* process reply */
if( n == -1 )
g10_log_error("read error on EGD: %s\n", strerror(errno));
else if( cmd == 2 && n != nbytes ) {
g10_log_error("bad EGD reply: too short %d/%d\n", nbytes, n );
}
else if( cmd == 2 ) {
(*add)( buffer, n, requester );
length -= n;
}
else if( !n )
g10_log_error("bad EGD reply: too short\n");
else if( buffer[0] != n-1 )
g10_log_error("bad EGD reply: count mismatch %d/%d\n",
n-1, buffer[0] );
else if( n==1 )
g10_log_info("no data from EGD\n");
else {
n -= 1;
(*add)( buffer+1, 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
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