485 lines
15 KiB
C
485 lines
15 KiB
C
/****************************************************************************
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* netuils/tftp/tftpc_put.c
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*
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* Copyright (C) 2008-2009, 2011 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/stat.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/net/netconfig.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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#define TFTP_RETRIES 3
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/****************************************************************************
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* Private Function Prototypes
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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_read
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****************************************************************************/
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static inline ssize_t tftp_read(int fd, uint8_t *buf, size_t buflen)
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{
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ssize_t nbytesread;
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ssize_t totalread = 0;
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while (totalread < buflen)
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{
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/* Read the data... repeating the read in the event that it was
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* interrupted by a signal.
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*/
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do
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{
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nbytesread = read(fd, buf, buflen - totalread);
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}
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while (nbytesread < 0 && errno == EINTR);
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/* Check for non-EINTR errors */
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if (nbytesread < 0)
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{
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ndbg("read failed: %d\n", errno);
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return ERROR;
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}
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/* Check for end of file */
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else if (nbytesread == 0)
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{
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break;
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}
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/* Handle partial reads. Partial reads can happen normally
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* when the source is some device driver that returns data
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* in bits and pieces as received (such as a pipe)
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*/
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totalread += nbytesread;
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buf += nbytesread;
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}
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return totalread;
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}
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/****************************************************************************
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* Name: tftp_mkdatapacket
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*
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* Description:
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* DATA 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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* N bytes: Data (where N <= 512)
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*
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* Input Parameters:
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* fd - File descriptor used to read from the file
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* offset - File offset to read from
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* packet - Buffer to write the data packet into
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* blockno - The block number of the packet
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*
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* Return Value:
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* Number of bytes read into the packet. <TFTP_PACKETSIZE means end of file;
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* <1 if an error occurs.
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*
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****************************************************************************/
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int tftp_mkdatapacket(int fd, off_t offset, uint8_t *packet, uint16_t blockno)
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{
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off_t tmp;
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int nbytesread;
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/* Format the DATA message header */
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packet[0] = TFTP_DATA >> 8;
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packet[1] = TFTP_DATA & 0xff;
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packet[2] = blockno >> 8;
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packet[3] = blockno & 0xff;
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/* Seek to the correct offset in the file */
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tmp = lseek(fd, offset, SEEK_SET);
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if (tmp == (off_t)-1)
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{
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ndbg("lseek failed: %d\n", errno);
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return ERROR;
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}
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/* Read the file data into the packet buffer */
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nbytesread = tftp_read(fd, &packet[TFTP_DATAHEADERSIZE], TFTP_DATASIZE);
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if (nbytesread < 0)
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{
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return ERROR;
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}
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return nbytesread + TFTP_DATAHEADERSIZE;
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}
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/****************************************************************************
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* Name: tftp_rcvack
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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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* Input Parameters:
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* sd - Socket descriptor to use in in the transfer
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* packet - buffer to use for the tranfers
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* server - The address of the server
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* port - The port number of the server (0 if not yet known)
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* blockno - Location to return block number in the received ACK
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*
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* Returned Value:
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* OK:success and blockno valid, ERROR:failure.
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*
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****************************************************************************/
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static int tftp_rcvack(int sd, uint8_t *packet, struct sockaddr_in *server,
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uint16_t *port, uint16_t *blockno)
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{
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struct sockaddr_in from; /* The address the last UDP message recv'd from */
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ssize_t nbytes; /* The number of bytes received. */
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uint16_t opcode; /* The received opcode */
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uint16_t rblockno; /* The received block number */
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int packetlen; /* Packet length */
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int retry; /* Retry counter */
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/* Try up to TFTP_RETRIES times */
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for (retry = 0; retry < TFTP_RETRIES; retry++)
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{
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/* Try for until a valid ACK is received or some error occurs */
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for (;;)
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{
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/* Receive the next UDP packet from the server */
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nbytes = tftp_recvfrom(sd, packet, TFTP_IOBUFSIZE, &from);
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if (nbytes < TFTP_ACKHEADERSIZE)
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{
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/* Failed to receive a good packet */
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if (nbytes == 0)
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{
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ndbg("Connection lost: %d bytes\n", nbytes);
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}
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else if (nbytes > 0)
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{
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ndbg("Short packet: %d bytes\n", nbytes);
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}
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else
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{
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ndbg("Recveid failure\n");
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}
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/* Break out to bump up the retry count */
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break;
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}
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else
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{
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/* Get the port being used by the server if that has not yet been established */
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if (!*port)
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{
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*port = from.sin_port;
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server->sin_port = from.sin_port;
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}
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/* Verify that the packet was received from the correct host and port */
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if (server->sin_addr.s_addr != from.sin_addr.s_addr)
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{
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ninfo("Invalid address in DATA\n");
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continue;
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}
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if (*port != server->sin_port)
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{
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ninfo("Invalid port in DATA\n");
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packetlen = tftp_mkerrpacket(packet, TFTP_ERR_UNKID, TFTP_ERRST_UNKID);
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(void)tftp_sendto(sd, packet, packetlen, server);
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continue;
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}
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/* Parse the error message */
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opcode = (uint16_t)packet[0] << 8 | (uint16_t)packet[1];
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rblockno = (uint16_t)packet[2] << 8 | (uint16_t)packet[3];
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/* Verify that the message that we received is an ACK for the
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* expected block number.
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*/
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if (opcode != TFTP_ACK)
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{
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ninfo("Bad opcode\n");
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#if defined(CONFIG_DEBUG_FEATURES) && defined(CONFIG_DEBUG_NET)
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if (opcode == TFTP_ERR)
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{
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(void)tftp_parseerrpacket(packet);
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}
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else
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#endif
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if (opcode > TFTP_MAXRFC1350)
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{
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packetlen = tftp_mkerrpacket(packet, TFTP_ERR_ILLEGALOP, TFTP_ERRST_ILLEGALOP);
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(void)tftp_sendto(sd, packet, packetlen, server);
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}
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/* Break out an bump up the retry count */
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break;
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}
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/* Success! */
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ninfo("Received ACK for block %d\n", rblockno);
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*blockno = rblockno;
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return OK;
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}
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}
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}
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/* We have tried TFTP_RETRIES times */
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ndbg("Timeout, Waiting for ACK\n");
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return ERROR; /* Will never get here */
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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: tftpput
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*
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* Input Parameters:
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* local - Path to the file system object to be sent.
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* remote - The name of the file on the TFTP server.
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* addr - The IP address of the server in network order
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* binary - TRUE: Perform binary ('octect') transfer
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* FALSE: Perform text ('netascii') transfer
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*
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****************************************************************************/
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int tftpput(const char *local, const char *remote, in_addr_t addr, bool binary)
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{
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struct sockaddr_in server; /* The address of the TFTP server */
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uint8_t *packet; /* Allocated memory to hold one packet */
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off_t offset; /* Offset into source file */
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uint16_t blockno; /* The current transfer block number */
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uint16_t rblockno; /* The ACK'ed block number */
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uint16_t port = 0; /* This is the port number for the transfer */
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int packetlen; /* The length of the data packet */
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int sd; /* Socket descriptor for socket I/O */
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int fd; /* File descriptor for file I/O */
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int retry; /* Retry counter */
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int result = ERROR; /* Assume failure */
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int ret; /* Generic return status */
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/* Allocate the buffer to used for socket/disk I/O */
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packet = (uint8_t*)zalloc(TFTP_IOBUFSIZE);
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if (!packet)
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{
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ndbg("packet memory allocation failure\n");
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set_errno(ENOMEM);
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goto errout;
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}
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/* Open the file for reading */
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fd = open(local, O_RDONLY);
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if (fd < 0)
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{
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ndbg("open failed: %d\n", errno);
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goto errout_with_packet;
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}
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/* Initialize a UDP socket and setup the server addresss */
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sd = tftp_sockinit(&server, addr);
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if (sd < 0)
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{
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goto errout_with_fd;
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}
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/* Send the write request using the well known port. This may need
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* to be done several times because (1) UDP is inherenly unreliable
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* and packets may be lost normally, and (2) uIP has a nasty habit
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* of droppying packets if there is nothing hit in the ARP table.
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*/
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blockno = 1;
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retry = 0;
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for (;;)
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{
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packetlen = tftp_mkreqpacket(packet, TFTP_WRQ, remote, binary);
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ret = tftp_sendto(sd, packet, packetlen, &server);
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if (ret != packetlen)
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{
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goto errout_with_sd;
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}
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/* Receive the ACK for the write request */
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if (tftp_rcvack(sd, packet, &server, &port, NULL) == 0)
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{
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break;
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}
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ndbg("Re-sending request\n");
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/* We are going to loop and re-send the request packet. Check the
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* retry count so that we do not loop forever.
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*/
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if (++retry > TFTP_RETRIES)
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{
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ndbg("Retry count exceeded\n");
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set_errno(ETIMEDOUT);
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goto errout_with_sd;
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}
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}
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/* Then loop sending the entire file to the server in chunks */
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offset = 0;
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retry = 0;
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for (;;)
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{
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/* Construct the next data packet */
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packetlen = tftp_mkdatapacket(fd, offset, packet, blockno);
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if (packetlen < 0)
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{
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goto errout_with_sd;
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}
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/* Send the next data chunk */
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ret = tftp_sendto(sd, packet, packetlen, &server);
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if (ret != packetlen)
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{
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goto errout_with_sd;
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}
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/* Check for an ACK for the data chunk */
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if (tftp_rcvack(sd, packet, &server, &port, &rblockno) == OK)
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{
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/* Check if the packet that we just sent was ACK'ed. If not,
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* we just loop to resend the same packet (same blockno, same
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* file offset).
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*/
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if (rblockno == blockno)
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{
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/* Yes.. If we are at the end of the file and if all of the packets
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* have been ACKed, then we are done.
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*/
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if (packetlen < TFTP_PACKETSIZE)
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{
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break;
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}
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/* Not the last block.. set up for the next block */
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blockno++;
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offset += TFTP_DATASIZE;
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retry = 0;
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/* Skip the retry test */
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continue;
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}
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}
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/* We are going to loop and re-send the data packet. Check the retry
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* count so that we do not loop forever.
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*/
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if (++retry > TFTP_RETRIES)
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{
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ndbg("Retry count exceeded\n");
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set_errno(ETIMEDOUT);
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goto errout_with_sd;
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}
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}
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/* Return success */
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result = OK;
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errout_with_sd:
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close(sd);
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errout_with_fd:
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close(fd);
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errout_with_packet:
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free(packet);
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errout:
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return result;
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}
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#endif /* CONFIG_NET && CONFIG_NET_UDP && CONFIG_NFILE_DESCRIPTORS > 0 */
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