1 files changed, 108 insertions, 0 deletions
diff --git a/helper.c b/helper.c
new file mode 100644
index 00000000..3b0402ec
--- /dev/null
+++ b/helper.c
@@ -0,0 +1,108 @@
+/*
+**
+** OpenBSD emulation routines
+**
+** Damien Miller <djm@ibs.com.au>
+** 
+** Copyright 1999 Internet Business Solutions
+**
+** Permission is hereby granted, free of charge, to any person
+** obtaining a copy of this software and associated documentation
+** files (the "Software"), to deal in the Software without
+** restriction, including without limitation the rights to use, copy,
+** modify, merge, publish, distribute, sublicense, and/or sell copies
+** of the Software, and to permit persons to whom the Software is
+** furnished to do so, subject to the following conditions:
+**
+** The above copyright notice and this permission notice shall be
+** included in all copies or substantial portions of the Software.
+**
+** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+** KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+** WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
+** AND NONINFRINGEMENT.  IN NO EVENT SHALL DAMIEN MILLER OR INTERNET
+** BUSINESS SOLUTIONS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+** ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
+** OR OTHER DEALINGS IN THE SOFTWARE.
+**
+** Except as contained in this notice, the name of Internet Business
+** Solutions shall not be used in advertising or otherwise to promote
+** the sale, use or other dealings in this Software without prior
+** written authorization from Internet Business Solutions.
+**
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include "rc4.h"
+#include "xmalloc.h"
+
+#include "helper.h"
+
+void get_random_bytes(unsigned char *buf, int len);
+
+static rc4_t *rc4 = NULL;
+
+void setproctitle(const char *fmt, ...)
+{
+	/* FIXME */
+}
+
+unsigned char arc4random(void)
+{
+	unsigned char r;
+
+	if (rc4 == NULL)
+		arc4random_stir();
+	
+	rc4_getbytes(rc4, &r, 1);
+	
+	return(r);
+}
+
+void arc4random_stir(void)
+{
+	unsigned char rand_buf[32];
+	
+	if (rc4 == NULL)
+		rc4 = xmalloc(sizeof(*rc4));
+	
+	get_random_bytes(rand_buf, sizeof(rand_buf));
+	rc4_key(rc4, rand_buf, sizeof(rand_buf));
+}
+
+void get_random_bytes(unsigned char *buf, int len)
+{
+	int urandom;
+	int c;
+	
+	urandom = open("/dev/urandom", O_RDONLY);
+	if (urandom == -1)
+	{
+		fprintf(stderr, "Couldn't open /dev/urandom: %s", strerror(errno));
+		exit(1);
+	}
+	
+	c = read(urandom, buf, len);
+	if (c == -1)
+	{
+		fprintf(stderr, "Couldn't read from /dev/urandom: %s", strerror(errno));
+		exit(1);
+	}
+
+	if (c != len)
+	{
+		fprintf(stderr, "Short read from /dev/urandom");
+		exit(1);
+	}
+}
+