forked from Archive/PX4-Autopilot
331 lines
9.5 KiB
C
331 lines
9.5 KiB
C
/****************************************************************************
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* netuils/tftp/tftpc_packets.c
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*
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* Copyright (C) 2008-2009, 2011-2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, TFTP_DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include <errno.h>
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#include <debug.h>
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#include <netinet/in.h>
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#include <net/uip/uipopt.h>
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#include <net/uip/uip.h>
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#include <apps/netutils/tftp.h>
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#include "tftpc_internal.h"
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#if defined(CONFIG_NET) && defined(CONFIG_NET_UDP) && CONFIG_NFILE_DESCRIPTORS > 0
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: tftp_mode
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****************************************************************************/
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static inline const char *tftp_mode(bool binary)
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{
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return binary ? "octet" : "netascii";
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: tftp_sockinit
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*
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* Description:
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* Common initialization logic: Create the socket and initialize the
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* server address structure.
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*
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****************************************************************************/
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int tftp_sockinit(struct sockaddr_in *server, in_addr_t addr)
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{
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struct timeval timeo;
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int sd;
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int ret;
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/* Create the UDP socket */
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sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
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if (sd < 0)
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{
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ndbg("socket failed: %d\n", errno);
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return ERROR;
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}
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/* Set the recvfrom timeout */
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timeo.tv_sec = CONFIG_NETUTILS_TFTP_TIMEOUT / 10;
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timeo.tv_usec = (CONFIG_NETUTILS_TFTP_TIMEOUT % 10) * 100000;
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ret = setsockopt(sd, SOL_SOCKET, SO_RCVTIMEO, &timeo, sizeof(struct timeval));
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if (ret < 0)
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{
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ndbg("setsockopt failed: %d\n", errno);
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}
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/* Initialize the server address structure */
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memset(server, 0, sizeof(struct sockaddr_in));
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server->sin_family = AF_INET;
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server->sin_addr.s_addr = addr;
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server->sin_port = HTONS(CONFIG_NETUTILS_TFTP_PORT);
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return sd;
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}
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/****************************************************************************
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* Name: tftp_mkreqpacket
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*
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* Description:
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* RRQ or WRQ message format:
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*
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* 2 bytes: Opcode (network order == big-endian)
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* N bytes: Filename
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* 1 byte: 0
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* N bytes: mode
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* 1 byte: 0
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*
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* Return
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* Then number of bytes in the request packet (never fails)
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*
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****************************************************************************/
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int tftp_mkreqpacket(uint8_t *buffer, int opcode, const char *path, bool binary)
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{
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buffer[0] = opcode >> 8;
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buffer[1] = opcode & 0xff;
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return sprintf((char*)&buffer[2], "%s%c%s", path, 0, tftp_mode(binary)) + 3;
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}
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/****************************************************************************
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* Name: tftp_mkackpacket
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*
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* Description:
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* ACK message format:
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*
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* 2 bytes: Opcode (network order == big-endian)
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* 2 bytes: Block number (network order == big-endian)
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*
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****************************************************************************/
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int tftp_mkackpacket(uint8_t *buffer, uint16_t blockno)
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{
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buffer[0] = TFTP_ACK >> 8;
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buffer[1] = TFTP_ACK & 0xff;
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buffer[2] = blockno >> 8;
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buffer[3] = blockno & 0xff;
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return 4;
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}
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/****************************************************************************
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* Name: tftp_mkerrpacket
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*
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* Description:
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* ERROR message format:
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*
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* 2 bytes: Opcode (network order == big-endian)
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* 2 bytes: Error number (network order == big-endian)
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* N bytes: Error string
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* 1 byte: 0
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*
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****************************************************************************/
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int tftp_mkerrpacket(uint8_t *buffer, uint16_t errorcode, const char *errormsg)
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{
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buffer[0] = TFTP_ERR >> 8;
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buffer[1] = TFTP_ERR & 0xff;
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buffer[2] = errorcode >> 8;
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buffer[3] = errorcode & 0xff;
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strcpy((char*)&buffer[4], errormsg);
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return strlen(errormsg) + 5;
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}
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/****************************************************************************
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* Name: tftp_parseerrpacket
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*
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* Description:
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* ERROR message format:
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*
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* 2 bytes: Opcode (network order == big-endian)
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* 2 bytes: Error number (network order == big-endian)
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* N bytes: Error string
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* 1 byte: 0
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*
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****************************************************************************/
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#if defined(CONFIG_DEBUG) && defined(CONFIG_DEBUG_NET)
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int tftp_parseerrpacket(const uint8_t *buffer)
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{
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uint16_t opcode = (uint16_t)buffer[0] << 8 | (uint16_t)buffer[1];
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uint16_t errcode = (uint16_t)buffer[2] << 8 | (uint16_t)buffer[3];
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const char *errmsg = (const char *)&buffer[4];
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if (opcode == TFTP_ERR)
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{
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ndbg("ERR message: %s (%d)\n", errmsg, errcode);
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return OK;
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}
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return ERROR;
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}
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#endif
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/****************************************************************************
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* Name: tftp_recvfrom
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*
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* Description:
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* recvfrom helper
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*
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****************************************************************************/
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ssize_t tftp_recvfrom(int sd, void *buf, size_t len, struct sockaddr_in *from)
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{
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int addrlen;
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ssize_t nbytes;
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/* Loop handles the case where the recvfrom is interrupted by a signal and
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* we should unconditionally try again.
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*/
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for (;;)
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{
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/* For debugging, it is helpful to start with a clean buffer */
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#if defined(CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_NET)
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memset(buf, 0, len);
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#endif
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/* Receive the packet */
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addrlen = sizeof(struct sockaddr_in);
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nbytes = recvfrom(sd, buf, len, 0, (struct sockaddr*)from, (socklen_t*)&addrlen);
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/* Check for errors */
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if (nbytes < 0)
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{
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/* Check for a timeout */
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if (errno == EAGAIN)
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{
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ndbg("recvfrom timed out\n");
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return ERROR;
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}
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/* If EINTR, then loop and try again. Other errors are fatal */
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else if (errno != EINTR)
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{
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ndbg("recvfrom failed: %d\n", errno);
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return ERROR;
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}
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}
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/* No errors? Return the number of bytes received */
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else
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{
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return nbytes;
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}
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}
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}
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/****************************************************************************
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* Name: tftp_sendto
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*
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* Description:
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* sendto helper
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*
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****************************************************************************/
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ssize_t tftp_sendto(int sd, const void *buf, size_t len, struct sockaddr_in *to)
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{
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ssize_t nbytes;
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/* Loop handles the case where the sendto is interrupted by a signal and
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* we should unconditionally try again.
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*/
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for (;;)
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{
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/* Send the packet */
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nbytes = sendto(sd, buf, len, 0, (struct sockaddr*)to, sizeof(struct sockaddr_in));
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/* Check for errors */
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if (nbytes < 0)
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{
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/* If EINTR, then loop and try again. Other errors are fatal */
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if (errno != EINTR)
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{
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ndbg("sendto failed: %d\n", errno);
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return ERROR;
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}
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}
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/* No errors? Return the number of bytes received */
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else
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{
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return nbytes;
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}
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}
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}
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#endif /* CONFIG_NET && CONFIG_NET_UDP && CONFIG_NFILE_DESCRIPTORS */
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