From ee41b41a303009548b1510cade2f4845d094814e Mon Sep 17 00:00:00 2001
From: John Crispin <john@openwrt.org>
Date: Tue, 19 Nov 2013 20:56:23 +0000
Subject: [PATCH] mtd: add a "mtd verify" call

Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 38871
---
 package/system/mtd/Makefile     |  1 +
 package/system/mtd/src/Makefile |  3 +-
 package/system/mtd/src/mtd.c    | 70 ++++++++++++++++++++++++++++++++-
 3 files changed, 72 insertions(+), 2 deletions(-)

diff --git a/package/system/mtd/Makefile b/package/system/mtd/Makefile
index f429128e02..97c61f04f1 100644
--- a/package/system/mtd/Makefile
+++ b/package/system/mtd/Makefile
@@ -22,6 +22,7 @@ include $(INCLUDE_DIR)/package.mk
 define Package/mtd
   SECTION:=utils
   CATEGORY:=Base system
+  DEPENDS:=+libubox
   TITLE:=Update utility for trx firmware images
 endef
 
diff --git a/package/system/mtd/src/Makefile b/package/system/mtd/src/Makefile
index 3f59c91c21..645064674b 100644
--- a/package/system/mtd/src/Makefile
+++ b/package/system/mtd/src/Makefile
@@ -1,7 +1,8 @@
 CC = gcc
 CFLAGS += -Wall
+LDFLAGS += -lubox
 
-obj = mtd.o jffs2.o crc32.o
+obj = mtd.o jffs2.o crc32.o md5.o
 obj.seama = seama.o md5.o
 obj.ar71xx = trx.o $(obj.seama)
 obj.brcm = trx.o
diff --git a/package/system/mtd/src/mtd.c b/package/system/mtd/src/mtd.c
index 2ec02a871b..73335f3fbe 100644
--- a/package/system/mtd/src/mtd.c
+++ b/package/system/mtd/src/mtd.c
@@ -44,6 +44,8 @@
 #include "fis.h"
 #include "mtd.h"
 
+#include <libubox/md5.h>
+
 #define MAX_ARGS 8
 #define JFFS2_DEFAULT_DIR	"" /* directory name without /, empty means root dir */
 
@@ -245,6 +247,63 @@ mtd_erase(const char *mtd)
 
 }
 
+static int
+mtd_verify(const char *mtd, char *file)
+{
+	uint32_t f_md5[4], m_md5[4];
+	struct stat s;
+	md5_ctx_t ctx;
+	int ret = 0;
+	int fd;
+
+	if (quiet < 2)
+		fprintf(stderr, "Verifying %s against %s ...\n", mtd, file);
+
+	if (stat(file, &s) || md5sum(file, f_md5)) {
+		fprintf(stderr, "Failed to hash %s\n", file);
+		return -1;
+	}
+
+	fd = mtd_check_open(mtd);
+	if(fd < 0) {
+		fprintf(stderr, "Could not open mtd device: %s\n", mtd);
+		return -1;
+	}
+
+	md5_begin(&ctx);
+	do {
+		char buf[256];
+		int len = (s.st_size > sizeof(buf)) ? (sizeof(buf)) : (s.st_size);
+		int rlen = read(fd, buf, len);
+
+		if (rlen < 0) {
+			if (errno == EINTR)
+				continue;
+			ret = -1;
+			goto out;
+		}
+		if (!rlen)
+			break;
+		md5_hash(buf, rlen, &ctx);
+		s.st_size -= rlen;
+	} while (s.st_size > 0);
+
+	md5_end(m_md5, &ctx);
+
+	fprintf(stderr, "%08x%08x%08x%08x - %s\n", m_md5[0], m_md5[1], m_md5[2], m_md5[3], mtd);
+	fprintf(stderr, "%08x%08x%08x%08x - %s\n", f_md5[0], f_md5[1], f_md5[2], f_md5[3], file);
+
+	ret = memcmp(f_md5, m_md5, sizeof(m_md5));
+	if (!ret)
+		fprintf(stderr, "Success\n");
+	else
+		fprintf(stderr, "Failed\n");
+
+out:
+	close(fd);
+	return ret;
+}
+
 static void
 indicate_writing(const char *mtd)
 {
@@ -341,7 +400,7 @@ resume:
 		exit(1);
 	}
 	if (part_offset > 0) {
-		fprintf(stderr, "Seeking on mtd device '%s' to: %u\n", mtd, part_offset);
+		fprintf(stderr, "Seeking on mtd device '%s' to: %zu\n", mtd, part_offset);
 		lseek(fd, part_offset, SEEK_SET);
 	}
 
@@ -483,6 +542,7 @@ static void usage(void)
 	"        unlock                  unlock the device\n"
 	"        refresh                 refresh mtd partition\n"
 	"        erase                   erase all data on device\n"
+	"        verify <imagefile>|-    verify <imagefile> (use - for stdin) to device\n"
 	"        write <imagefile>|-     write <imagefile> (use - for stdin) to device\n"
 	"        jffs2write <file>       append <file> to the jffs2 partition on the device\n");
 	if (mtd_fixtrx) {
@@ -548,6 +608,7 @@ int main (int argc, char **argv)
 		CMD_JFFS2WRITE,
 		CMD_FIXTRX,
 		CMD_FIXSEAMA,
+		CMD_VERIFY,
 	} cmd = -1;
 
 	erase[0] = NULL;
@@ -644,6 +705,10 @@ int main (int argc, char **argv)
 	} else if (((strcmp(argv[0], "fixseama") == 0) && (argc == 2)) && mtd_fixseama) {
 		cmd = CMD_FIXSEAMA;
 		device = argv[1];
+	} else if ((strcmp(argv[0], "verify") == 0) && (argc == 3)) {
+		cmd = CMD_VERIFY;
+		imagefile = argv[1];
+		device = argv[2];
 	} else if ((strcmp(argv[0], "write") == 0) && (argc == 3)) {
 		cmd = CMD_WRITE;
 		device = argv[2];
@@ -698,6 +763,9 @@ int main (int argc, char **argv)
 			if (!unlocked)
 				mtd_unlock(device);
 			break;
+		case CMD_VERIFY:
+			mtd_verify(device, imagefile);
+			break;
 		case CMD_ERASE:
 			if (!unlocked)
 				mtd_unlock(device);
-- 
2.30.2