rand_egd.c
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/*
* Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <openssl/opensslconf.h>
#ifdef OPENSSL_NO_EGD
NON_EMPTY_TRANSLATION_UNIT
#else
# include <openssl/crypto.h>
# include <openssl/e_os2.h>
# include <openssl/rand.h>
/*
* Query an EGD
*/
# if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_MSDOS) || defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_VOS) || defined(OPENSSL_SYS_UEFI)
int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes)
{
return -1;
}
int RAND_egd(const char *path)
{
return -1;
}
int RAND_egd_bytes(const char *path, int bytes)
{
return -1;
}
# else
# include OPENSSL_UNISTD
# include <stddef.h>
# include <sys/types.h>
# include <sys/socket.h>
# ifndef NO_SYS_UN_H
# ifdef OPENSSL_SYS_VXWORKS
# include <streams/un.h>
# else
# include <sys/un.h>
# endif
# else
struct sockaddr_un {
short sun_family; /* AF_UNIX */
char sun_path[108]; /* path name (gag) */
};
# endif /* NO_SYS_UN_H */
# include <string.h>
# include <errno.h>
int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes)
{
FILE *fp = NULL;
struct sockaddr_un addr;
int mybuffer, ret = -1, i, numbytes, fd;
unsigned char tempbuf[255];
if (bytes > (int)sizeof(tempbuf))
return -1;
/* Make socket. */
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
if (strlen(path) >= sizeof(addr.sun_path))
return -1;
strcpy(addr.sun_path, path);
i = offsetof(struct sockaddr_un, sun_path) + strlen(path);
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd == -1 || (fp = fdopen(fd, "r+")) == NULL)
return -1;
setbuf(fp, NULL);
/* Try to connect */
for ( ; ; ) {
if (connect(fd, (struct sockaddr *)&addr, i) == 0)
break;
# ifdef EISCONN
if (errno == EISCONN)
break;
# endif
switch (errno) {
# ifdef EINTR
case EINTR:
# endif
# ifdef EAGAIN
case EAGAIN:
# endif
# ifdef EINPROGRESS
case EINPROGRESS:
# endif
# ifdef EALREADY
case EALREADY:
# endif
/* No error, try again */
break;
default:
ret = -1;
goto err;
}
}
/* Make request, see how many bytes we can get back. */
tempbuf[0] = 1;
tempbuf[1] = bytes;
if (fwrite(tempbuf, sizeof(char), 2, fp) != 2 || fflush(fp) == EOF)
goto err;
if (fread(tempbuf, sizeof(char), 1, fp) != 1 || tempbuf[0] == 0)
goto err;
numbytes = tempbuf[0];
/* Which buffer are we using? */
mybuffer = buf == NULL;
if (mybuffer)
buf = tempbuf;
/* Read bytes. */
i = fread(buf, sizeof(char), numbytes, fp);
if (i < numbytes)
goto err;
ret = numbytes;
if (mybuffer)
RAND_add(tempbuf, i, i);
err:
if (fp != NULL)
fclose(fp);
return ret;
}
int RAND_egd_bytes(const char *path, int bytes)
{
int num;
num = RAND_query_egd_bytes(path, NULL, bytes);
if (num < 0)
return -1;
if (RAND_status() != 1)
return -1;
return num;
}
int RAND_egd(const char *path)
{
return RAND_egd_bytes(path, 255);
}
# endif
#endif