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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define APR_WANT_MEMFUNC
#include "apr_want.h"
#include "apr_general.h"
#include "apr_arch_misc.h"
#include <sys/stat.h>
#if APR_HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if APR_HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#if APR_HAVE_FCNTL_H
#include <fcntl.h>
#endif
#if APR_HAVE_UNISTD_H
#include <unistd.h>
#endif
#if APR_HAVE_SYS_UN_H
#include <sys/un.h>
#endif
#ifndef SHUT_RDWR
#define SHUT_RDWR 2
#endif
#if APR_HAS_RANDOM
APR_DECLARE(apr_status_t) apr_generate_random_bytes(unsigned char *buf,
#ifdef APR_ENABLE_FOR_1_0
apr_size_t length)
#else
int length)
#endif
{
#ifdef DEV_RANDOM
int fd = -1;
/* On BSD/OS 4.1, /dev/random gives out 8 bytes at a time, then
* gives EOF, so reading 'length' bytes may require opening the
* device several times. */
do {
apr_ssize_t rc;
if (fd == -1)
if ((fd = open(DEV_RANDOM, O_RDONLY)) == -1)
return errno;
rc = read(fd, buf, length);
if (rc < 0) {
int errnum = errno;
close(fd);
return errnum;
}
else if (rc == 0) {
close(fd);
fd = -1; /* force open() again */
}
else {
buf += rc;
length -= rc;
}
} while (length > 0);
close(fd);
#elif defined(OS2)
static UCHAR randbyte();
unsigned int idx;
for (idx=0; idx<length; idx++)
buf[idx] = randbyte();
#elif defined(HAVE_EGD)
/* use EGD-compatible socket daemon (such as EGD or PRNGd).
* message format:
* 0x00 (get entropy level)
* 0xMM (msb) 0xmm 0xll 0xLL (lsb)
* 0x01 (read entropy nonblocking) 0xNN (bytes requested)
* 0xMM (bytes granted) MM bytes
* 0x02 (read entropy blocking) 0xNN (bytes desired)
* [block] NN bytes
* 0x03 (write entropy) 0xMM 0xLL (bits of entropy) 0xNN (bytes of data)
* NN bytes
* (no response - write only)
* 0x04 (report PID)
* 0xMM (length of PID string, not null-terminated) MM chars
*/
static const char *egd_sockets[] = { EGD_DEFAULT_SOCKET, NULL };
const char **egdsockname = NULL;
int egd_socket, egd_path_len, rv, bad_errno;
struct sockaddr_un addr;
apr_socklen_t egd_addr_len;
apr_size_t resp_expected;
unsigned char req[2], resp[255];
unsigned char *curbuf = buf;
for (egdsockname = egd_sockets; *egdsockname && length > 0; egdsockname++) {
egd_path_len = strlen(*egdsockname);
if (egd_path_len > sizeof(addr.sun_path)) {
return APR_EINVAL;
}
memset(&addr, 0, sizeof(struct sockaddr_un));
addr.sun_family = AF_UNIX;
memcpy(addr.sun_path, *egdsockname, egd_path_len);
egd_addr_len = APR_OFFSETOF(struct sockaddr_un, sun_path) +
egd_path_len;
egd_socket = socket(PF_UNIX, SOCK_STREAM, 0);
if (egd_socket == -1) {
return errno;
}
rv = connect(egd_socket, (struct sockaddr*)&addr, egd_addr_len);
if (rv == -1) {
bad_errno = errno;
continue;
}
/* EGD can only return 255 bytes of data at a time. Silly. */
while (length > 0) {
apr_ssize_t srv;
req[0] = 2; /* We'll block for now. */
req[1] = length > 255 ? 255: length;
srv = write(egd_socket, req, 2);
if (srv == -1) {
bad_errno = errno;
shutdown(egd_socket, SHUT_RDWR);
close(egd_socket);
break;
}
if (srv != 2) {
shutdown(egd_socket, SHUT_RDWR);
close(egd_socket);
return APR_EGENERAL;
}
resp_expected = req[1];
srv = read(egd_socket, resp, resp_expected);
if (srv == -1) {
bad_errno = errno;
shutdown(egd_socket, SHUT_RDWR);
close(egd_socket);
return bad_errno;
}
memcpy(curbuf, resp, srv);
curbuf += srv;
length -= srv;
}
shutdown(egd_socket, SHUT_RDWR);
close(egd_socket);
}
if (length > 0) {
/* We must have iterated through the list of sockets,
* and no go. Return the errno.
*/
return bad_errno;
}
#elif defined(HAVE_TRUERAND) /* use truerand */
extern int randbyte(void); /* from the truerand library */
unsigned int idx;
/* this will increase the startup time of the server, unfortunately...
* (generating 20 bytes takes about 8 seconds)
*/
for (idx=0; idx<length; idx++)
buf[idx] = (unsigned char) randbyte();
#endif /* DEV_RANDOM */
return APR_SUCCESS;
}
#undef STR
#undef XSTR
#ifdef OS2
#include "../os2/randbyte.c"
#endif
#endif /* APR_HAS_RANDOM */
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