lib: updatehub: Add download block check

The current CoAP implementation not perform any checks including
duplicated packets. This add block sequency verification and a
timer to ensures that slow networks works apropriately.

Signed-off-by: Gerson Fernando Budke <gerson.budke@ossystems.com.br>

lib/updatehub/CMakeLists.txt

@@ -9,4 +9,5 @@ zephyr_library()
 zephyr_library_sources_ifdef(CONFIG_UPDATEHUB updatehub.c)
 zephyr_library_sources_ifdef(CONFIG_UPDATEHUB updatehub_device.c)
 zephyr_library_sources_ifdef(CONFIG_UPDATEHUB updatehub_firmware.c)
+zephyr_library_sources_ifdef(CONFIG_UPDATEHUB updatehub_timer.c)
 zephyr_library_sources_ifdef(CONFIG_UPDATEHUB_SHELL shell.c)

lib/updatehub/Kconfig

@@ -86,6 +86,14 @@ config UPDATEHUB_DTLS
 	  Enables DTLS communication between the UpdateHub
 	  client and the server
 
+config UPDATEHUB_COAP_CONN_TIMEOUT
+	int "CoAP connection timeout in seconds"
+	default 10
+	range 1 360
+	depends on UPDATEHUB
+	help
+	  Set the CoAP connection timeout value.
+
 config UPDATEHUB_COAP_MAX_RETRY
 	int "Maximum retries attempts to download a packet"
 	default 10

lib/updatehub/updatehub.c

@@ -26,6 +26,7 @@ LOG_MODULE_REGISTER(updatehub, CONFIG_UPDATEHUB_LOG_LEVEL);
 #include "updatehub_priv.h"
 #include "updatehub_firmware.h"
 #include "updatehub_device.h"
+#include "updatehub_timer.h"
 
 #if defined(CONFIG_UPDATEHUB_DTLS)
 #define CA_CERTIFICATE_TAG 1
@@ -363,6 +364,29 @@ static bool install_update_cb_sha256(void)
 	return true;
 }
 
+static int install_update_cb_check_blk_num(struct coap_packet *resp)
+{
+	int blk_num;
+	int blk2_opt;
+
+	blk2_opt = coap_get_option_int(resp, COAP_OPTION_BLOCK2);
+
+	if ((resp->max_len - resp->offset) <= 0 || (blk2_opt < 0)) {
+		LOG_DBG("Invalid data received or block number is < 0");
+		return -ENOENT;
+	}
+
+	blk_num = GET_BLOCK_NUM(blk2_opt);
+
+	if (blk_num == updatehub_blk_get(UPDATEHUB_BLK_INDEX)) {
+		updatehub_blk_inc(UPDATEHUB_BLK_INDEX);
+
+		return 0;
+	}
+
+	return -EAGAIN;
+}
+
 static void install_update_cb(void)
 {
 	struct coap_packet response_packet;
@@ -390,6 +414,15 @@ static void install_update_cb(void)
 		goto cleanup;
 	}
 
+	if (install_update_cb_check_blk_num(&response_packet) < 0) {
+		ctx.code_status = UPDATEHUB_DOWNLOAD_ERROR;
+		goto cleanup;
+	}
+
+	updatehub_tmr_stop();
+	updatehub_blk_set(UPDATEHUB_BLK_ATTEMPT, 0);
+	updatehub_blk_set(UPDATEHUB_BLK_TX_AVAILABLE, 1);
+
 	ctx.downloaded_size = ctx.downloaded_size +
 			      (response_packet.max_len - response_packet.offset);
 
@@ -438,9 +471,6 @@ cleanup:
 
 static enum updatehub_response install_update(void)
 {
-	int verification_download = 0;
-	int attempts_download = 0;
-
 	if (boot_erase_img_bank(FLASH_AREA_ID(image_1)) != 0) {
 		LOG_ERR("Failed to init flash and erase second slot");
 		ctx.code_status = UPDATEHUB_FLASH_INIT_ERROR;
@@ -469,31 +499,43 @@ static enum updatehub_response install_update(void)
 	flash_img_init(&ctx.flash_ctx);
 
 	ctx.downloaded_size = 0;
+	updatehub_blk_set(UPDATEHUB_BLK_ATTEMPT, 0);
+	updatehub_blk_set(UPDATEHUB_BLK_INDEX, 0);
+	updatehub_blk_set(UPDATEHUB_BLK_TX_AVAILABLE, 1);
 
 	while (ctx.downloaded_size != ctx.block.total_size) {
-		verification_download = ctx.downloaded_size;
-
+		if (updatehub_blk_get(UPDATEHUB_BLK_TX_AVAILABLE)) {
 			if (send_request(COAP_TYPE_CON, COAP_METHOD_GET,
 					 UPDATEHUB_DOWNLOAD) < 0) {
 				ctx.code_status = UPDATEHUB_NETWORKING_ERROR;
 				goto cleanup;
 			}
 
+			updatehub_blk_set(UPDATEHUB_BLK_TX_AVAILABLE, 0);
+			updatehub_blk_inc(UPDATEHUB_BLK_ATTEMPT);
+			updatehub_tmr_start();
+		}
+
 		install_update_cb();
 
-		if (ctx.code_status != UPDATEHUB_OK) {
+		if (ctx.code_status == UPDATEHUB_OK) {
+			continue;
+		}
+
+		if (ctx.code_status != UPDATEHUB_DOWNLOAD_ERROR &&
+		    ctx.code_status != UPDATEHUB_NETWORKING_ERROR) {
+			LOG_DBG("status: %d", ctx.code_status);
 			goto cleanup;
 		}
 
-		if (verification_download == ctx.downloaded_size) {
-			if (attempts_download ==
+		if (updatehub_blk_get(UPDATEHUB_BLK_ATTEMPT) ==
 		    CONFIG_UPDATEHUB_COAP_MAX_RETRY) {
+			updatehub_tmr_stop();
+
 			LOG_ERR("Could not get the packet");
 			ctx.code_status = UPDATEHUB_DOWNLOAD_ERROR;
 			goto cleanup;
 		}
-			attempts_download++;
-		}
 	}
 
 cleanup:
@@ -719,6 +761,9 @@ enum updatehub_response updatehub_probe(void)
 		goto cleanup;
 	}
 
+	LOG_DBG("metadata size: %d", strlen(metadata));
+	LOG_HEXDUMP_DBG(metadata, MAX_DOWNLOAD_DATA, "metadata");
+
 	memcpy(metadata_copy, metadata, strlen(metadata));
 	if (json_obj_parse(metadata, strlen(metadata),
 			   recv_probe_sh_array_descr,
@@ -747,6 +792,7 @@ enum updatehub_response updatehub_probe(void)
 		       metadata_any_boards.objects[1].objects.sha256sum,
 		       SHA256_HEX_DIGEST_SIZE);
 		update_info.image_size = metadata_any_boards.objects[1].objects.size;
+		LOG_DBG("metadata_any: %s", update_info.sha256sum_image);
 	} else {
 		if (!is_compatible_hardware(&metadata_some_boards)) {
 			LOG_ERR("Incompatible hardware");
@@ -769,6 +815,7 @@ enum updatehub_response updatehub_probe(void)
 		       SHA256_HEX_DIGEST_SIZE);
 		update_info.image_size =
 			metadata_some_boards.objects[1].objects.size;
+		LOG_DBG("metadata_some: %s", update_info.sha256sum_image);
 	}
 
 	ctx.code_status = UPDATEHUB_HAS_UPDATE;

lib/updatehub/updatehub_timer.c

@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2020 O.S.Systems
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <logging/log.h>
+LOG_MODULE_DECLARE(updatehub, CONFIG_UPDATEHUB_LOG_LEVEL);
+
+#include <zephyr.h>
+#include "updatehub_timer.h"
+
+static int blk_vars[UPDATEHUB_BLK_MAX_VARS];
+
+static void timer_expire(struct k_timer *timer)
+{
+	LOG_DBG("tmr_expire");
+	blk_vars[UPDATEHUB_BLK_TX_AVAILABLE] = 1;
+}
+
+K_TIMER_DEFINE(uhu_packet_down_tmr, timer_expire, NULL);
+
+int updatehub_blk_get(enum updatehub_blk_vars var)
+{
+	LOG_DBG("blk_get[%d] = %d", var, blk_vars[var]);
+	return blk_vars[var];
+}
+
+void updatehub_blk_inc(enum updatehub_blk_vars var)
+{
+	blk_vars[var]++;
+	LOG_DBG("blk_inc[%d] = %d", var, blk_vars[var]);
+}
+
+void updatehub_blk_set(enum updatehub_blk_vars var, int val)
+{
+	LOG_DBG("blk_set[%d] = %d", var, val);
+	blk_vars[var] = val;
+}
+
+void updatehub_tmr_start(void)
+{
+	LOG_DBG("tmr_start");
+	k_timer_start(&uhu_packet_down_tmr,
+		      K_SECONDS(CONFIG_UPDATEHUB_COAP_CONN_TIMEOUT),
+		      K_NO_WAIT);
+}
+
+void updatehub_tmr_stop(void)
+{
+	LOG_DBG("tmr_stop");
+	k_timer_stop(&uhu_packet_down_tmr);
+}

lib/updatehub/updatehub_timer.h

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2020 O.S.Systems
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef __UPDATEHUB_TIMER_H__
+#define __UPDATEHUB_TIMER_H__
+
+enum updatehub_blk_vars {
+	UPDATEHUB_BLK_ATTEMPT,
+	UPDATEHUB_BLK_INDEX,
+	UPDATEHUB_BLK_TX_AVAILABLE,
+
+	UPDATEHUB_BLK_MAX_VARS,
+};
+
+int updatehub_blk_get(enum updatehub_blk_vars var);
+void updatehub_blk_inc(enum updatehub_blk_vars var);
+void updatehub_blk_set(enum updatehub_blk_vars var, int val);
+
+void updatehub_tmr_start(void);
+void updatehub_tmr_stop(void);
+
+#endif /* __UPDATEHUB_TIMER_H__ */