Bug#811315: getdns: FTBFS[kfreebsd]: needs getentropy implementation
Package: getdns
Version: 0.9.0-1
Severity: normal
Tags: patch
Hi,
getdns FTBFS on kfreebsd because it lacks a getentropy implementation
for the FreeBSD kernel. But there is one already in LibreSSL Portable
we can use, and works fine here.
Please find patch attached. Thanks!
-- System Information:
Debian Release: stretch/sid
APT prefers unstable
APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: kfreebsd-amd64 (x86_64)
Kernel: kFreeBSD 10.1-0-amd64
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
From: Steven Chamberlain <steven@pyro.eu.org>
Date: Sun, 17 Jan 2016 21:25:04 +0000
Subject: Add GNU/kFreeBSD support
Import getentropy_freebsd.c from LibreSSL Portable, an implementation of
getentropy(2) that uses FreeBSD's kern.random sysctl.
Add support for GNU/kFreeBSD by matching *FreeBSD in configure.ac
and building getentropy_freebsd in that case. This hasn't been
tested yet on regular FreeBSD, which may require extra libs.
--- a/configure.ac
+++ b/configure.ac
@@ -988,6 +988,10 @@
fi
AC_SEARCH_LIBS([clock_gettime], [rt])
;;
+ *FreeBSD)
+ AC_LIBOBJ(getentropy_freebsd)
+ AC_CHECK_HEADERS([sys/sysctl.h],,, [AC_INCLUDES_DEFAULT])
+ ;;
Linux|*)
AC_LIBOBJ(getentropy_linux)
dnl AC_CHECK_FUNCS([SHA512_Update],,[
--- /dev/null
+++ b/src/compat/getentropy_freebsd.c
@@ -0,0 +1,62 @@
+/* $OpenBSD: getentropy_freebsd.c,v 1.1 2014/11/03 06:23:30 bcook Exp $ */
+
+/*
+ * Copyright (c) 2014 Pawel Jakub Dawidek <pjd@FreeBSD.org>
+ * Copyright (c) 2014 Brent Cook <bcook@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Emulation of getentropy(2) as documented at:
+ * http://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man2/getentropy.2
+ */
+
+#include <sys/types.h>
+#include <sys/sysctl.h>
+
+#include <errno.h>
+#include <stddef.h>
+
+/*
+ * Derived from lib/libc/gen/arc4random.c from FreeBSD.
+ */
+static size_t
+getentropy_sysctl(u_char *buf, size_t size)
+{
+ int mib[2];
+ size_t len, done;
+
+ mib[0] = CTL_KERN;
+ mib[1] = KERN_ARND;
+ done = 0;
+
+ do {
+ len = size;
+ if (sysctl(mib, 2, buf, &len, NULL, 0) == -1)
+ return (done);
+ done += len;
+ buf += len;
+ size -= len;
+ } while (size > 0);
+
+ return (done);
+}
+
+int
+getentropy(void *buf, size_t len)
+{
+ if (len <= 256 && getentropy_sysctl(buf, len) == len)
+ return (0);
+
+ errno = EIO;
+ return (-1);
+}
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