[Xen-changelog] [xen-unstable] blktap: Fall back to libcrypto if libgcrypt is not installed.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1214822350 -3600
# Node ID 51b392ab1912e00d11fe5373ddf8dd2c1d2ae612
# Parent  81d47e75ce1ab8e9c1f5924773c18d36de29f632
blktap: Fall back to libcrypto if libgcrypt is not installed.
Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
---
 tools/blktap/drivers/Makefile     |   10 ++++++++-
 tools/blktap/drivers/block-qcow.c |   40 +++++++++++++++++++++++++++++++++++++-
 tools/blktap/drivers/check_gcrypt |   14 +++++++++++++
 3 files changed, 62 insertions(+), 2 deletions(-)

diff -r 81d47e75ce1a -r 51b392ab1912 tools/blktap/drivers/Makefile
--- a/tools/blktap/drivers/Makefile     Mon Jun 30 10:02:21 2008 +0100
+++ b/tools/blktap/drivers/Makefile     Mon Jun 30 11:39:10 2008 +0100
@@ -17,8 +17,16 @@ CFLAGS   += -Wp,-MD,.$(@F).d
 CFLAGS   += -Wp,-MD,.$(@F).d
 DEPS      = .*.d
 
+ifeq ($(shell . ./check_gcrypt),"yes")
+CFLAGS += -DUSE_GCRYPT
+CRYPT_LIB := -lgcrypt
+else
+CRYPT_LIB := -lcrypto
+$(warning *** libgcrypt not installed: falling back to libcrypto ***)
+endif
+
 LDFLAGS_blktapctrl := $(LDFLAGS_libxenctrl) $(LDFLAGS_libxenstore) -L../lib 
-lblktap
-LDFLAGS_img := $(LIBAIO_DIR)/libaio.a -lgcrypt -lpthread -lz
+LDFLAGS_img := $(LIBAIO_DIR)/libaio.a $(CRYPT_LIB) -lpthread -lz
 
 BLK-OBJS-y  := block-aio.o
 BLK-OBJS-y  += block-sync.o
diff -r 81d47e75ce1a -r 51b392ab1912 tools/blktap/drivers/block-qcow.c
--- a/tools/blktap/drivers/block-qcow.c Mon Jun 30 10:02:21 2008 +0100
+++ b/tools/blktap/drivers/block-qcow.c Mon Jun 30 11:39:10 2008 +0100
@@ -33,7 +33,6 @@
 #include <zlib.h>
 #include <inttypes.h>
 #include <libaio.h>
-#include <gcrypt.h>
 #include "bswap.h"
 #include "aes.h"
 #include "tapdisk.h"
@@ -146,6 +145,10 @@ struct tdqcow_state {
 
 static int decompress_cluster(struct tdqcow_state *s, uint64_t cluster_offset);
 
+#ifdef USE_GCRYPT
+
+#include <gcrypt.h>
+
 static uint32_t gen_cksum(char *ptr, int len)
 {
        int i;
@@ -166,6 +169,41 @@ static uint32_t gen_cksum(char *ptr, int
 
        return md[0];
 }
+
+#else /* use libcrypto */
+
+#include <openssl/md5.h>
+
+static uint32_t gen_cksum(char *ptr, int len)
+{
+       int i;
+       unsigned char *md;
+       uint32_t ret;
+
+       md = malloc(MD5_DIGEST_LENGTH);
+       if(!md) return 0;
+
+       /* Convert L1 table to big endian */
+       for(i = 0; i < len / sizeof(uint64_t); i++) {
+               cpu_to_be64s(&((uint64_t*) ptr)[i]);
+       }
+
+       /* Generate checksum */
+       if (MD5((unsigned char *)ptr, len, md) != md)
+               ret = 0;
+       else
+               memcpy(&ret, md, sizeof(uint32_t));
+
+       /* Convert L1 table back to native endianess */
+       for(i = 0; i < len / sizeof(uint64_t); i++) {
+               be64_to_cpus(&((uint64_t*) ptr)[i]);
+       }
+
+       free(md);
+       return ret;
+}
+
+#endif
 
 static int get_filesize(char *filename, uint64_t *size, struct stat *st)
 {
diff -r 81d47e75ce1a -r 51b392ab1912 tools/blktap/drivers/check_gcrypt
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/blktap/drivers/check_gcrypt Mon Jun 30 11:39:10 2008 +0100
@@ -0,0 +1,14 @@
+#!/bin/sh
+
+cat > .gcrypt.c << EOF
+#include <gcrypt.h>
+int main(void) { return 0; }
+EOF
+
+if $1 -o .gcrypt .gcrypt.c -lgcrypt 2>/dev/null ; then
+  echo "yes"
+else
+  echo "no"
+fi
+
+rm -f .gcrypt*

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