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337 lines
11 KiB
337 lines
11 KiB
/**************************************************************************** |
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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 <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/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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