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764c4ce1e4
nuttx/netutils/tftpc/tftpc_get.c
patacongo 764c4ce1e4 TFTP Client 
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@878 42af7a65-404d-4744-a932-0658087f49c3
2008-09-05 22:39:10 +00:00

353 lines
11 KiB
C
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/****************************************************************************
* netuils/tftp/tftpc_get.c
*
* Copyright (C) 2008 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, TFTP_DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Compilation Switches
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <debug.h>
#include <net/uip/uipopt.h>
#include <net/uip/uip.h>
#include <net/uip/tftp.h>
#include "tftpc_internal.h"
#if defined(CONFIG_NET) && defined(CONFIG_NET_UDP) && CONFIG_NFILE_DESCRIPTORS > 0
/****************************************************************************
* Definitions
****************************************************************************/
#define TFTP_RETRIES 3
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: tftp_write
****************************************************************************/
static inline ssize_t tftp_write(int fd, const ubyte *buf, size_t len)
{
size_t left = len;
ssize_t nbyteswritten;
while (left > 0)
{
/* Write the data... repeating the write in the event that it was
* interrupted by a signal.
*/
do
{
nbyteswritten = write(fd, buf, left);
}
while (nbyteswritten < 0 && errno == EINTR);
/* Check for non-EINTR errors */
if (nbyteswritten < 0)
{
ndbg(g_tftpcallfailed, "write", errno);
return ERROR;
}
/* Handle partial writes */
left -= nbyteswritten;
buf += nbyteswritten;
}
return len;
}
/****************************************************************************
* Name: tftp_parsedatapacket
****************************************************************************/
static inline int tftp_parsedatapacket(const ubyte *packet,
uint16 *opcode, uint16 *blockno)
{
*opcode = (uint16)packet[0] << 8 | (uint16)packet[1];
if (*opcode == TFTP_DATA)
{
*blockno = (uint16)packet[2] << 8 | (uint16)packet[3];
return OK;
}
#if CONFIG_DEBUG
else if (*opcode == TFTP_ERR)
{
(void)tftp_parseerrpacket(packet);
}
#endif
return ERROR;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: tftpget
*
* Input Parameters:
* remote - The name of the file on the TFTP server.
* local - Path to the location on a mounted filesystem where the file
* will be stored.
* addr - The IP address of the server in network order
* binary - TRUE: Perform binary ('octect') transfer
* FALSE: Perform text ('netascii') transfer
*
****************************************************************************/
int tftpget(const char *remote, const char *local, in_addr_t addr, boolean binary)
{
struct sockaddr_in server; /* The address of the TFTP server */
struct sockaddr_in from; /* The address the last UDP message recv'd from */
ubyte *packet; /* Allocated memory to hold one packet */
uint16 blockno = 0; /* The current transfer block number */
uint16 port = 0; /* This is the port number for the transfer */
uint16 opcode; /* Received opcode */
uint16 rblockno; /* Received block number */
int len; /* Generic length */
int sd; /* Socket descriptor for socket I/O */
int fd; /* File descriptor for file I/O */
int retry; /* Retry counter */
int nbytesrecvd; /* The number of bytes received in the packet */
int ndatabytes; /* The number of data bytes received */
int result = ERROR; /* Assume failure */
int ret; /* Generic return status */
#if CONFIG_NETUTILS_TFTP_ACKPACKETS > 1
uint16 lastacked = 0; /* The last block number that was ACK'ed */
int ablockno; /* Number of un-ACKed packets */
#endif
/* Allocate the buffer to used for socket/disk I/O */
packet = (ubyte*)zalloc(TFTP_IOBUFSIZE);
if (!packet)
{
ndbg(g_tftpnomemory, "packet");
errno = ENOMEM;
goto errout;
}
/* Open the file for writing */
fd = open(local, O_WRONLY|O_CREAT|O_TRUNC, 0666);
if (fd < 0)
{
ndbg(g_tftpcallfailed, "open", errno);
goto errout_with_packet;
}
/* Initialize a UDP socket and setup the server addresss */
sd = tftp_sockinit(&server, addr);
if (sd < 0)
{
goto errout_with_fd;
}
/* Send the read request */
len = tftp_mkreqpacket(packet, TFTP_RRQ, remote, binary);
ret = tftp_sendto(sd, packet, len, &server);
if (ret != len)
{
goto errout_with_sd;
}
/* Then enter the transfer loop. Loop until the entire file has
* been received or until an error occurs.
*/
#if CONFIG_NETUTILS_TFTP_ACKPACKETS > 1
ablockno = CONFIG_NETUTILS_TFTP_ACKPACKETS-1;
#endif
do
{
/* Increment the TFTP block number for the next transfer */
blockno++;
/* Send the next block if the file within a loop. We will
* retry up to TFTP_RETRIES times before giving up on the
* transfer.
*/
for (retry = 0; retry < TFTP_RETRIES; retry++)
{
/* Get the next packet from the server */
nbytesrecvd = tftp_recvfrom(sd, packet, TFTP_IOBUFSIZE, &from);
/* Check if anything valid was received */
if (nbytesrecvd >= 0)
{
/* Replace the server port to the one in the response */
if (!port)
{
port = from.sin_port;
server.sin_port = port;
}
/* Verify the sender address and port number */
if (server.sin_addr.s_addr != from.sin_addr.s_addr)
{
nvdbg(g_tftpaddress, "recvfrom");
retry--;
continue;
}
if (port != from.sin_port)
{
nvdbg(g_tftpport, "recvfrom");
len = tftp_mkerrpacket(packet, TFTP_ERR_UNKID, TFTP_ERRST_UNKID);
ret = tftp_sendto(sd, packet, len, &server);
retry--;
continue;
}
/* Parse the incoming DATA packet */
if (nbytesrecvd < TFTP_DATAHEADERSIZE ||
tftp_parsedatapacket(packet, &opcode, &blockno) != OK ||
blockno != rblockno)
{
nvdbg("Parse failure\n");
if (opcode > TFTP_MAXRFC1350)
{
len = tftp_mkerrpacket(packet, TFTP_ERR_ILLEGALOP, TFTP_ERRST_ILLEGALOP);
ret = tftp_sendto(sd, packet, len, &server);
}
continue;
}
/* Break out of the loop when we receive a good data packet */
break;
}
}
/* Did we exhaust all of the retries? */
if (retry == TFTP_RETRIES)
{
nvdbg(g_tftptoomanyretries);
goto errout_with_sd;
}
/* Write the received data chunk to the file */
ndatabytes = nbytesrecvd - TFTP_DATAHEADERSIZE;
if (tftp_write(fd, packet + TFTP_DATAHEADERSIZE, ndatabytes) < 0)
{
goto errout_with_sd;
}
/* Send the acknowledgment if we have reach the configured block count */
#if CONFIG_NETUTILS_TFTP_ACKPACKETS > 1
ablockno++;
if (ablockno == CONFIG_NETUTILS_TFTP_ACKPACKETS)
#endif
{
len = tftp_mkackpacket(packet, blockno);
ret = tftp_sendto(sd, packet, len, &server);
if (ret != len)
{
goto errout_with_sd;
}
#if CONFIG_NETUTILS_TFTP_ACKPACKETS > 1
lastacked = blockno;
#endif
nvdbg("ACK blockno %d\n", blockno);
}
}
while (ndatabytes >= TFTP_DATASIZE);
/* The final packet of the transfer will be a partial packet
*
* If the final packet(s) were not ACK'ed, then we will ACK them here
*/
#if CONFIG_NETUTILS_TFTP_ACKPACKETS > 1
if (ndatabytes < blockno != lastacked)
{
len = tftp_mkackpacket(packet, blockno);
ret = tftp_sendto(sd, packet, len, &server);
if (ret != len)
{
goto errout_with_sd;
}
nvdbg("ACK blockno %d\n", blockno);
}
#endif
/* Return success */
result = OK;
errout_with_sd:
close(sd);
errout_with_fd:
close(fd);
errout_with_packet:
free(packet);
errout:
return result;
}
#endif /* CONFIG_NET && CONFIG_NET_UDP && CONFIG_NFILE_DESCRIPTORS > 0 */
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