338 lines
11 KiB
C
338 lines
11 KiB
C
/****************************************************************************
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* netuils/tftp/tftpc_get.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 <spudmonkey@racsa.co.cr>
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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/uip/uipopt.h>
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#include <nuttx/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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#define TFTP_RETRIES 3
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: tftp_write
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****************************************************************************/
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static inline ssize_t tftp_write(int fd, const uint8_t *buf, size_t len)
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{
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size_t left = len;
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ssize_t nbyteswritten;
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while (left > 0)
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{
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/* Write the data... repeating the write 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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nbyteswritten = write(fd, buf, left);
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}
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while (nbyteswritten < 0 && errno == EINTR);
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/* Check for non-EINTR errors */
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if (nbyteswritten < 0)
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{
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ndbg("write failed: %d\n", errno);
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return ERROR;
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}
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/* Handle partial writes */
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nvdbg("Wrote %d bytes to file\n", nbyteswritten);
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left -= nbyteswritten;
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buf += nbyteswritten;
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}
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return len;
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}
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/****************************************************************************
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* Name: tftp_parsedatapacket
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****************************************************************************/
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static inline int tftp_parsedatapacket(const uint8_t *packet,
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uint16_t *opcode, uint16_t *blockno)
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{
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*opcode = (uint16_t)packet[0] << 8 | (uint16_t)packet[1];
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if (*opcode == TFTP_DATA)
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{
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*blockno = (uint16_t)packet[2] << 8 | (uint16_t)packet[3];
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return OK;
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}
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#if defined(CONFIG_DEBUG) && defined(CONFIG_DEBUG_NET)
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else if (*opcode == TFTP_ERR)
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{
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(void)tftp_parseerrpacket(packet);
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}
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#endif
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return ERROR;
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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: tftpget
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*
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* Input Parameters:
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* remote - The name of the file on the TFTP server.
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* local - Path to the location on a mounted filesystem where the file
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* will be stored.
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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 tftpget(const char *remote, const char *local, 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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struct sockaddr_in from; /* The address the last UDP message recv'd from */
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uint8_t *packet; /* Allocated memory to hold one packet */
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uint16_t blockno = 0; /* The current transfer block number */
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uint16_t opcode; /* Received opcode */
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uint16_t rblockno; /* Received block number */
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int len; /* Generic length */
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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 nbytesrecvd = 0; /* The number of bytes received in the packet */
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int ndatabytes; /* The number of data bytes received */
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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 writing */
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fd = open(local, O_WRONLY|O_CREAT|O_TRUNC, 0666);
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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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/* Then enter the transfer loop. Loop until the entire file has
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* been received or until an error occurs.
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*/
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do
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{
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/* Increment the TFTP block number for the next transfer */
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blockno++;
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/* Send the next block if the file within a loop. We will
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* retry up to TFTP_RETRIES times before giving up on the
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* transfer.
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*/
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for (retry = 0; retry < TFTP_RETRIES; retry++)
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{
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/* Send the read request using the well-known port number before
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* receiving the first block. Each retry of the first block will
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* re-send the request.
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*/
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if (blockno == 1)
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{
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len = tftp_mkreqpacket(packet, TFTP_RRQ, remote, binary);
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server.sin_port = HTONS(CONFIG_NETUTILS_TFTP_PORT);
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ret = tftp_sendto(sd, packet, len, &server);
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if (ret != len)
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{
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goto errout_with_sd;
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}
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/* Subsequent sendto will use the port number selected by the TFTP
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* server in the DATA packet. Setting the server port to zero
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* here indicates that we have not yet received the server port number.
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*/
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server.sin_port = 0;
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}
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/* Get the next packet from the server */
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nbytesrecvd = tftp_recvfrom(sd, packet, TFTP_IOBUFSIZE, &from);
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/* Check if anything valid was received */
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if (nbytesrecvd > 0)
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{
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/* Verify the sender address and port number */
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if (server.sin_addr.s_addr != from.sin_addr.s_addr)
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{
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nvdbg("Invalid address in DATA\n");
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retry--;
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continue;
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}
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if (server.sin_port && server.sin_port != from.sin_port)
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{
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nvdbg("Invalid port in DATA\n");
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len = tftp_mkerrpacket(packet, TFTP_ERR_UNKID, TFTP_ERRST_UNKID);
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ret = tftp_sendto(sd, packet, len, &from);
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retry--;
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continue;
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}
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/* Parse the incoming DATA packet */
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if (nbytesrecvd < TFTP_DATAHEADERSIZE)
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{
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/* Packet is not big enough to be parsed */
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nvdbg("Tiny data packet ignored\n");
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continue;
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}
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if (tftp_parsedatapacket(packet, &opcode, &rblockno) != OK ||
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blockno != rblockno)
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{
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/* Opcode is not TFTP_DATA or the block number is unexpected */
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nvdbg("Parse failure\n");
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if (opcode > TFTP_MAXRFC1350)
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{
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len = tftp_mkerrpacket(packet, TFTP_ERR_ILLEGALOP, TFTP_ERRST_ILLEGALOP);
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ret = tftp_sendto(sd, packet, len, &from);
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}
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continue;
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}
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/* Replace the server port to the one in the good data response */
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if (!server.sin_port)
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{
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server.sin_port = from.sin_port;
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}
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/* Then break out of the loop */
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break;
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}
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}
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/* Did we exhaust all of the retries? */
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if (retry == TFTP_RETRIES)
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{
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nvdbg("Retry limit exceeded\n");
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goto errout_with_sd;
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}
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/* Write the received data chunk to the file */
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ndatabytes = nbytesrecvd - TFTP_DATAHEADERSIZE;
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tftp_dumpbuffer("Recvd DATA", packet + TFTP_DATAHEADERSIZE, ndatabytes);
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if (tftp_write(fd, packet + TFTP_DATAHEADERSIZE, ndatabytes) < 0)
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{
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goto errout_with_sd;
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}
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/* Send the acknowledgment */
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len = tftp_mkackpacket(packet, blockno);
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ret = tftp_sendto(sd, packet, len, &server);
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if (ret != len)
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{
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goto errout_with_sd;
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}
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nvdbg("ACK blockno %d\n", blockno);
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}
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while (ndatabytes >= TFTP_DATASIZE);
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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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