| /* |
| * Copyright (c) 2017 Linaro Limited |
| * Copyright (c) 2018-2019 Foundries.io |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #define LOG_MODULE_NAME net_lwm2m_pull_context |
| #define LOG_LEVEL CONFIG_LWM2M_LOG_LEVEL |
| |
| #include <zephyr/logging/log.h> |
| LOG_MODULE_REGISTER(LOG_MODULE_NAME); |
| |
| #include <ctype.h> |
| #include <stdio.h> |
| #include <string.h> |
| |
| #include <zephyr/net/http_parser.h> |
| #include <zephyr/net/socket.h> |
| |
| #include "lwm2m_pull_context.h" |
| #include "lwm2m_engine.h" |
| |
| static K_SEM_DEFINE(lwm2m_pull_sem, 1, 1); |
| |
| #define NETWORK_INIT_TIMEOUT K_SECONDS(10) |
| #define NETWORK_CONNECT_TIMEOUT K_SECONDS(10) |
| #define PACKET_TRANSFER_RETRY_MAX 3 |
| |
| #if defined(CONFIG_LWM2M_FIRMWARE_UPDATE_PULL_COAP_PROXY_SUPPORT) |
| #define COAP2COAP_PROXY_URI_PATH "coap2coap" |
| #define COAP2HTTP_PROXY_URI_PATH "coap2http" |
| |
| static char proxy_uri[LWM2M_PACKAGE_URI_LEN]; |
| #endif |
| |
| static struct firmware_pull_context { |
| uint8_t obj_inst_id; |
| char uri[LWM2M_PACKAGE_URI_LEN]; |
| bool is_firmware_uri; |
| void (*result_cb)(uint16_t obj_inst_id, int error_code); |
| lwm2m_engine_set_data_cb_t write_cb; |
| |
| struct lwm2m_ctx firmware_ctx; |
| struct coap_block_context block_ctx; |
| } context; |
| |
| static int n_retry; |
| |
| static void do_transmit_timeout_cb(struct lwm2m_message *msg); |
| |
| /** |
| * Close all open connections and release the context semaphore |
| */ |
| static void cleanup_context(void) |
| { |
| lwm2m_engine_stop(&context.firmware_ctx); |
| |
| k_sem_give(&lwm2m_pull_sem); |
| } |
| |
| static int transfer_request(struct coap_block_context *ctx, uint8_t *token, uint8_t tkl, |
| coap_reply_t reply_cb) |
| { |
| struct lwm2m_message *msg; |
| int ret; |
| char *cursor; |
| #if !defined(CONFIG_LWM2M_FIRMWARE_UPDATE_PULL_COAP_PROXY_SUPPORT) |
| struct http_parser_url parser; |
| uint16_t off, len; |
| char *next_slash; |
| #endif |
| |
| msg = lwm2m_get_message(&context.firmware_ctx); |
| if (!msg) { |
| LOG_ERR("Unable to get a lwm2m message!"); |
| return -ENOMEM; |
| } |
| |
| msg->type = COAP_TYPE_CON; |
| msg->code = COAP_METHOD_GET; |
| msg->mid = coap_next_id(); |
| msg->token = token; |
| msg->tkl = tkl; |
| msg->reply_cb = reply_cb; |
| msg->message_timeout_cb = do_transmit_timeout_cb; |
| |
| ret = lwm2m_init_message(msg); |
| if (ret < 0) { |
| LOG_ERR("Error setting up lwm2m message"); |
| goto cleanup; |
| } |
| |
| #if defined(CONFIG_LWM2M_FIRMWARE_UPDATE_PULL_COAP_PROXY_SUPPORT) |
| /* TODO: shift to lower case */ |
| if (strncmp(context.uri, "http", 4) == 0) { |
| cursor = COAP2HTTP_PROXY_URI_PATH; |
| } else if (strncmp(context.uri, "coap", 4) == 0) { |
| cursor = COAP2COAP_PROXY_URI_PATH; |
| } else { |
| ret = -EPROTONOSUPPORT; |
| LOG_ERR("Unsupported schema"); |
| goto cleanup; |
| } |
| |
| ret = coap_packet_append_option(&msg->cpkt, COAP_OPTION_URI_PATH, cursor, strlen(cursor)); |
| if (ret < 0) { |
| LOG_ERR("Error adding URI_PATH '%s'", cursor); |
| goto cleanup; |
| } |
| #else |
| http_parser_url_init(&parser); |
| ret = http_parser_parse_url(context.uri, strlen(context.uri), 0, &parser); |
| if (ret < 0) { |
| LOG_ERR("Invalid firmware url: %s", context.uri); |
| ret = -ENOTSUP; |
| goto cleanup; |
| } |
| |
| /* if path is not available, off/len will be zero */ |
| off = parser.field_data[UF_PATH].off; |
| len = parser.field_data[UF_PATH].len; |
| cursor = context.uri + off; |
| |
| /* add path portions (separated by slashes) */ |
| while (len > 0 && (next_slash = strchr(cursor, '/')) != NULL) { |
| if (next_slash != cursor) { |
| ret = coap_packet_append_option(&msg->cpkt, COAP_OPTION_URI_PATH, cursor, |
| next_slash - cursor); |
| if (ret < 0) { |
| LOG_ERR("Error adding URI_PATH"); |
| goto cleanup; |
| } |
| } |
| |
| /* skip slash */ |
| len -= (next_slash - cursor) + 1; |
| cursor = next_slash + 1; |
| } |
| |
| if (len > 0) { |
| /* flush the rest */ |
| ret = coap_packet_append_option(&msg->cpkt, COAP_OPTION_URI_PATH, cursor, len); |
| if (ret < 0) { |
| LOG_ERR("Error adding URI_PATH"); |
| goto cleanup; |
| } |
| } |
| #endif |
| |
| ret = coap_append_block2_option(&msg->cpkt, ctx); |
| if (ret < 0) { |
| LOG_ERR("Unable to add block2 option."); |
| goto cleanup; |
| } |
| |
| #if defined(CONFIG_LWM2M_FIRMWARE_UPDATE_PULL_COAP_PROXY_SUPPORT) |
| ret = coap_packet_append_option(&msg->cpkt, COAP_OPTION_PROXY_URI, context.uri, |
| strlen(context.uri)); |
| if (ret < 0) { |
| LOG_ERR("Error adding PROXY_URI '%s'", context.uri); |
| goto cleanup; |
| } |
| #else |
| /* Ask the server to provide a size estimate */ |
| ret = coap_append_option_int(&msg->cpkt, COAP_OPTION_SIZE2, 0); |
| if (ret < 0) { |
| LOG_ERR("Unable to add size2 option."); |
| goto cleanup; |
| } |
| #endif |
| |
| /* send request */ |
| ret = lwm2m_send_message_async(msg); |
| if (ret < 0) { |
| LOG_ERR("Error sending LWM2M packet (err:%d).", ret); |
| goto cleanup; |
| } |
| |
| return 0; |
| |
| cleanup: |
| lwm2m_reset_message(msg, true); |
| return ret; |
| } |
| |
| static int do_firmware_transfer_reply_cb(const struct coap_packet *response, |
| struct coap_reply *reply, const struct sockaddr *from) |
| { |
| int ret; |
| bool last_block; |
| uint8_t token[8]; |
| uint8_t tkl; |
| uint16_t payload_len, payload_offset, len; |
| struct coap_packet *check_response = (struct coap_packet *)response; |
| struct lwm2m_engine_res *res = NULL; |
| size_t write_buflen; |
| uint8_t resp_code, *write_buf; |
| struct coap_block_context received_block_ctx; |
| const uint8_t *payload_start; |
| |
| /* token is used to determine a valid ACK vs a separated response */ |
| tkl = coap_header_get_token(check_response, token); |
| |
| /* If separated response (ACK) return and wait for response */ |
| if (!tkl && coap_header_get_type(response) == COAP_TYPE_ACK) { |
| return 0; |
| } else if (coap_header_get_type(response) == COAP_TYPE_CON) { |
| /* Send back ACK so the server knows we received the pkt */ |
| ret = lwm2m_send_empty_ack(&context.firmware_ctx, |
| coap_header_get_id(check_response)); |
| if (ret < 0) { |
| LOG_ERR("Error transmitting ACK"); |
| goto error; |
| } |
| } |
| |
| /* Check response code from server. Expecting (2.05) */ |
| resp_code = coap_header_get_code(check_response); |
| if (resp_code != COAP_RESPONSE_CODE_CONTENT) { |
| LOG_ERR("Unexpected response from server: %d.%d", |
| COAP_RESPONSE_CODE_CLASS(resp_code), COAP_RESPONSE_CODE_DETAIL(resp_code)); |
| ret = -ENOMSG; |
| goto error; |
| } |
| |
| /* save main firmware block context */ |
| memcpy(&received_block_ctx, &context.block_ctx, sizeof(context.block_ctx)); |
| |
| ret = coap_update_from_block(check_response, &context.block_ctx); |
| if (ret < 0) { |
| LOG_ERR("Error from block update: %d", ret); |
| ret = -EFAULT; |
| goto error; |
| } |
| |
| /* test for duplicate transfer */ |
| if (context.block_ctx.current < received_block_ctx.current) { |
| LOG_WRN("Duplicate packet ignored"); |
| |
| /* restore main firmware block context */ |
| memcpy(&context.block_ctx, &received_block_ctx, sizeof(context.block_ctx)); |
| |
| /* set reply->user_data to error to avoid releasing */ |
| reply->user_data = (void *)COAP_REPLY_STATUS_ERROR; |
| return 0; |
| } |
| |
| /* Reach last block if ret equals to 0 */ |
| last_block = !coap_next_block(check_response, &context.block_ctx); |
| |
| /* Process incoming data */ |
| payload_start = coap_packet_get_payload(response, &payload_len); |
| if (payload_len > 0) { |
| payload_offset = payload_start - response->data; |
| LOG_DBG("total: %zd, current: %zd", context.block_ctx.total_size, |
| context.block_ctx.current); |
| |
| /* look up firmware package resource */ |
| ret = lwm2m_engine_get_resource("5/0/0", &res); |
| if (ret < 0) { |
| goto error; |
| } |
| |
| /* get buffer data */ |
| write_buf = res->res_instances->data_ptr; |
| write_buflen = res->res_instances->max_data_len; |
| |
| /* check for user override to buffer */ |
| if (res->pre_write_cb) { |
| write_buf = res->pre_write_cb(0, 0, 0, &write_buflen); |
| } |
| |
| if (context.write_cb) { |
| /* flush incoming data to write_cb */ |
| while (payload_len > 0) { |
| len = (payload_len > write_buflen) ? write_buflen : payload_len; |
| payload_len -= len; |
| /* check for end of packet */ |
| if (buf_read(write_buf, len, CPKT_BUF_READ(response), |
| &payload_offset) < 0) { |
| /* malformed packet */ |
| ret = -EFAULT; |
| goto error; |
| } |
| |
| ret = context.write_cb(context.obj_inst_id, 0, 0, write_buf, len, |
| last_block && (payload_len == 0U), |
| context.block_ctx.total_size); |
| if (ret < 0) { |
| goto error; |
| } |
| } |
| } |
| } |
| |
| if (!last_block) { |
| /* More block(s) to come, setup next transfer */ |
| ret = transfer_request(&context.block_ctx, token, tkl, |
| do_firmware_transfer_reply_cb); |
| if (ret < 0) { |
| goto error; |
| } |
| } else { |
| /* Download finished */ |
| context.result_cb(context.obj_inst_id, 0); |
| cleanup_context(); |
| } |
| |
| return 0; |
| |
| error: |
| context.result_cb(context.obj_inst_id, ret); |
| cleanup_context(); |
| return ret; |
| } |
| |
| static void do_transmit_timeout_cb(struct lwm2m_message *msg) |
| { |
| int ret; |
| |
| if (n_retry < PACKET_TRANSFER_RETRY_MAX) { |
| /* retry block */ |
| LOG_WRN("TIMEOUT - Sending a retry packet!"); |
| |
| ret = transfer_request(&context.block_ctx, msg->token, msg->tkl, |
| do_firmware_transfer_reply_cb); |
| if (ret < 0) { |
| /* abort retries / transfer */ |
| n_retry = PACKET_TRANSFER_RETRY_MAX; |
| context.result_cb(context.obj_inst_id, ret); |
| cleanup_context(); |
| return; |
| } |
| |
| n_retry++; |
| } else { |
| LOG_ERR("TIMEOUT - Too many retry packet attempts! " |
| "Aborting firmware download."); |
| context.result_cb(context.obj_inst_id, -ENOMSG); |
| cleanup_context(); |
| } |
| } |
| |
| static void firmware_transfer(void) |
| { |
| int ret; |
| char *server_addr; |
| |
| ret = k_sem_take(&lwm2m_pull_sem, K_NO_WAIT); |
| |
| #if defined(CONFIG_LWM2M_FIRMWARE_UPDATE_PULL_COAP_PROXY_SUPPORT) |
| server_addr = CONFIG_LWM2M_FIRMWARE_UPDATE_PULL_COAP_PROXY_ADDR; |
| if (strlen(server_addr) >= LWM2M_PACKAGE_URI_LEN) { |
| LOG_ERR("Invalid Proxy URI: %s", server_addr); |
| ret = -ENOTSUP; |
| goto error; |
| } |
| |
| /* Copy required as it gets modified when port is available */ |
| strcpy(proxy_uri, server_addr); |
| server_addr = proxy_uri; |
| #else |
| server_addr = context.uri; |
| #endif |
| |
| ret = lwm2m_parse_peerinfo(server_addr, &context.firmware_ctx, context.is_firmware_uri); |
| if (ret < 0) { |
| LOG_ERR("Failed to parse server URI."); |
| goto error; |
| } |
| |
| lwm2m_engine_context_init(&context.firmware_ctx); |
| ret = lwm2m_socket_start(&context.firmware_ctx); |
| if (ret < 0) { |
| LOG_ERR("Cannot start a firmware-pull connection:%d", ret); |
| goto error; |
| } |
| |
| LOG_INF("Connecting to server %s", context.uri); |
| |
| /* reset block transfer context */ |
| coap_block_transfer_init(&context.block_ctx, lwm2m_default_block_size(), 0); |
| ret = transfer_request(&context.block_ctx, coap_next_token(), 8, |
| do_firmware_transfer_reply_cb); |
| if (ret < 0) { |
| goto error; |
| } |
| |
| return; |
| |
| error: |
| context.result_cb(context.obj_inst_id, ret); |
| cleanup_context(); |
| } |
| |
| int lwm2m_pull_context_start_transfer(char *uri, struct requesting_object req, k_timeout_t timeout) |
| { |
| int ret; |
| |
| if (!req.write_cb || !req.result_cb) { |
| LOG_DBG("Context failed sanity check. Verify initialization!"); |
| return -EINVAL; |
| } |
| |
| /* Check if we are not in the middle of downloading */ |
| ret = k_sem_take(&lwm2m_pull_sem, K_NO_WAIT); |
| if (ret) { |
| context.result_cb(req.obj_inst_id, -EALREADY); |
| return -EALREADY; |
| } |
| k_sem_give(&lwm2m_pull_sem); |
| |
| context.obj_inst_id = req.obj_inst_id; |
| memcpy(context.uri, uri, LWM2M_PACKAGE_URI_LEN); |
| context.is_firmware_uri = req.is_firmware_uri; |
| context.result_cb = req.result_cb; |
| context.write_cb = req.write_cb; |
| |
| (void)memset(&context.firmware_ctx, 0, sizeof(struct lwm2m_ctx)); |
| (void)memset(&context.block_ctx, 0, sizeof(struct coap_block_context)); |
| context.firmware_ctx.sock_fd = -1; |
| |
| n_retry = 0; |
| firmware_transfer(); |
| |
| return 0; |
| } |