| /* |
| * Copyright (c) 2020 InnBlue |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| /* Generic header files required by the TFTPC Module. */ |
| #include <zephyr.h> |
| #include <errno.h> |
| #include <net/socket.h> |
| |
| /* Defines for creating static arrays for TFTP communication. */ |
| #define TFTP_HEADER_SIZE 4 |
| #define TFTP_BLOCK_SIZE 512 |
| #define TFTP_MAX_MODE_SIZE 8 |
| #define TFTP_REQ_RETX CONFIG_TFTPC_REQUEST_RETRANSMITS |
| |
| /* Maximum amount of data that can be received in a single go ! */ |
| #define TFTPC_MAX_BUF_SIZE (TFTP_BLOCK_SIZE + TFTP_HEADER_SIZE) |
| |
| /* Maximum filename size allowed by the TFTP Client. This is used as |
| * an upper bound in the "make_request" function to ensure that there |
| * are no buffer overflows. The complete "tftpc_buffer" has the size of |
| * "TFTPC_MAX_BUF_SIZE" which is used when creating a request. From this |
| * total size, we need 2 bytes for request info, 2 dummy NULL bytes and |
| * "TFTP_MAX_MODE_SIZE" for mode info. Everything else can be used for |
| * filename. |
| */ |
| #define TFTP_MAX_FILENAME_SIZE (TFTPC_MAX_BUF_SIZE - TFTP_MAX_MODE_SIZE - 4) |
| |
| /* TFTP Opcodes. */ |
| #define READ_REQUEST 0x1 |
| #define WRITE_REQUEST 0x2 |
| #define DATA_OPCODE 0x3 |
| #define ACK_OPCODE 0x4 |
| #define ERROR_OPCODE 0x5 |
| |
| #define RECV_DATA_SIZE() (tftpc_buffer_size - TFTP_HEADER_SIZE) |
| |
| /* Name: send_ack |
| * Description: This function sends an Ack to the TFTP |
| * Server (in response to the data sent by the |
| * Server). |
| */ |
| static inline int send_ack(int sock, int block) |
| { |
| uint8_t tmp[4]; |
| |
| LOG_INF("Client acking Block Number: %d", block); |
| |
| /* Fill in the "Ack" Opcode and the block no. */ |
| sys_put_be16(ACK_OPCODE, tmp); |
| sys_put_be16(block, tmp + 2); |
| |
| /* Lets send this request buffer out. Size of request |
| * buffer is 4 bytes. |
| */ |
| return send(sock, tmp, 4, 0); |
| } |