1 files changed, 146 insertions, 0 deletions
diff --git a/programs/ranbits/ranbits.c b/programs/ranbits/ranbits.c
new file mode 100644
index 000000000..7b9a0f76e
--- /dev/null
+++ b/programs/ranbits/ranbits.c
@@ -0,0 +1,146 @@
+/*
+ * random bit generation for scripts, control files, etc.
+ * Copyright (C) 1998, 1999, 2000  Henry Spencer.
+ * 
+ * This program 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.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ * 
+ * This program 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.
+ *
+ * RCSID $Id: ranbits.c,v 1.1 2004/03/15 20:35:30 as Exp $
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <limits.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <fcntl.h>
+#include <netinet/in.h>
+#include <freeswan.h>
+
+#ifndef DEVICE
+#define	DEVICE	"/dev/random"
+#endif
+#ifndef QDEVICE
+#define	QDEVICE	"/dev/urandom"
+#endif
+#ifndef MAXBITS
+#define	MAXBITS	20000
+#endif
+
+char usage[] = "Usage: ranbits [--quick] [--continuous] [--bytes] nbits";
+struct option opts[] = {
+  {"quick",	0,	NULL,	'q',},
+  {"continuous",	0,	NULL,	'c',},
+  {"bytes",	0,	NULL,	'b',},
+  {"help",		0,	NULL,	'h',},
+  {"version",	0,	NULL,	'v',},
+  {0,		0,	NULL,	0,}
+};
+int quick = 0;			/* quick and dirty? */
+char format = 'h';		/* datatot() format code */
+int isbytes = 0;		/* byte count rather than bits? */
+
+char me[] = "ipsec ranbits";	/* for messages */
+
+char buf[MAXBITS/CHAR_BIT];
+char outbuf[3*sizeof(buf)];
+
+int main(int argc, char *argv[])
+{
+	int opt;
+	extern int optind;
+	int errflg = 0;
+	int nbits;
+	size_t nbytes;
+	char *devname;
+	int dev;
+	size_t ndone;
+	size_t nneeded;
+	ssize_t got;
+
+	while ((opt = getopt_long(argc, argv, "", opts, NULL)) != EOF)
+		switch (opt) {
+		case 'q':	/* quick and dirty randomness */
+			quick = 1;
+			break;
+		case 'c':	/* continuous hex, no underscores */
+			format = 'x';
+			break;
+		case 'b':	/* byte count, not bit count */
+			isbytes = 1;
+			break;
+		case 'h':	/* help */
+			printf("%s\n", usage);
+			exit(0);
+			break;
+		case 'v':	/* version */
+			printf("%s %s\n", me, ipsec_version_code());
+			exit(0);
+			break;
+		case '?':
+		default:
+			errflg = 1;
+			break;
+		}
+	if (errflg || optind != argc-1) {
+		fprintf(stderr, "%s\n", usage);
+		exit(2);
+	}
+
+	nbits = atoi(argv[optind]);
+	if (isbytes)
+		nbits *= CHAR_BIT;
+	if (nbits <= 0) {
+		fprintf(stderr, "%s: invalid bit count (%d)\n", me, nbits);
+		exit(1);
+	}
+	if (nbits > MAXBITS) {
+		fprintf(stderr, "%s: overlarge bit count (max %d)\n", me,
+								MAXBITS);
+		exit(1);
+	}
+	nbytes = (size_t)(nbits + CHAR_BIT - 1) / CHAR_BIT;
+
+	devname = (quick) ? QDEVICE : DEVICE;
+	dev = open(devname, 0);
+	if (dev < 0) {
+		fprintf(stderr, "%s: could not open %s (%s)\n", me,
+						devname, strerror(errno));
+		exit(1);
+	}
+
+	ndone = 0;
+	while (ndone < nbytes) {
+		got = read(dev, buf + ndone, nbytes - ndone);
+		if (got < 0) {
+			fprintf(stderr, "%s: read error on %s (%s)\n", me,
+						devname, strerror(errno));
+			exit(1);
+		}
+		if (got == 0) {
+			fprintf(stderr, "%s: eof on %s!?!\n", me, devname);
+			exit(1);
+		}
+		ndone += got;
+	}
+
+	nneeded = datatot(buf, nbytes, format, outbuf, sizeof(outbuf));
+	if (nneeded > sizeof(outbuf)) {
+		fprintf(stderr, "%s: buffer overflow (need %ld bytes)?!?\n",
+						me, (long)nneeded);
+		exit(1);
+	}
+	printf("%s\n", outbuf);
+	exit(0);
+}