diff options
Diffstat (limited to 'apps/netutils/tftpc/tftpc_get.c')
| -rw-r--r-- | apps/netutils/tftpc/tftpc_get.c | 328 |
1 files changed, 328 insertions, 0 deletions
diff --git a/apps/netutils/tftpc/tftpc_get.c b/apps/netutils/tftpc/tftpc_get.c new file mode 100644 index 000000000..e0779d17d --- /dev/null +++ b/apps/netutils/tftpc/tftpc_get.c @@ -0,0 +1,328 @@ +/**************************************************************************** + * netuils/tftp/tftpc_get.c + * + * Copyright (C) 2008-2009, 2011 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. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <sys/types.h> +#include <sys/stat.h> +#include <stdint.h> +#include <stdbool.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 <apps/netutils/tftp.h> + +#include "tftpc_internal.h" + +#if defined(CONFIG_NET) && defined(CONFIG_NET_UDP) && CONFIG_NFILE_DESCRIPTORS > 0 + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +#define TFTP_RETRIES 3 + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: tftp_write + ****************************************************************************/ + +static inline ssize_t tftp_write(int fd, const uint8_t *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("write failed: %d\n", errno); + return ERROR; + } + + /* Handle partial writes */ + + nvdbg("Wrote %d bytes to file\n", nbyteswritten); + left -= nbyteswritten; + buf += nbyteswritten; + } + return len; +} + +/**************************************************************************** + * Name: tftp_parsedatapacket + ****************************************************************************/ + +static inline int tftp_parsedatapacket(const uint8_t *packet, + uint16_t *opcode, uint16_t *blockno) +{ + *opcode = (uint16_t)packet[0] << 8 | (uint16_t)packet[1]; + if (*opcode == TFTP_DATA) + { + *blockno = (uint16_t)packet[2] << 8 | (uint16_t)packet[3]; + return OK; + } +#if defined(CONFIG_DEBUG) && defined(CONFIG_DEBUG_NET) + 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, bool binary) +{ + struct sockaddr_in server; /* The address of the TFTP server */ + struct sockaddr_in from; /* The address the last UDP message recv'd from */ + uint8_t *packet; /* Allocated memory to hold one packet */ + uint16_t blockno = 0; /* The current transfer block number */ + uint16_t opcode; /* Received opcode */ + uint16_t 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 = 0; /* 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 */ + + /* Allocate the buffer to used for socket/disk I/O */ + + packet = (uint8_t*)zalloc(TFTP_IOBUFSIZE); + if (!packet) + { + ndbg("packet memory allocation failure\n"); + errno = ENOMEM; + goto errout; + } + + /* Open the file for writing */ + + fd = open(local, O_WRONLY|O_CREAT|O_TRUNC, 0666); + if (fd < 0) + { + ndbg("open failed: %d\n", 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; + } + + /* Then enter the transfer loop. Loop until the entire file has + * been received or until an error occurs. + */ + + 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++) + { + /* Send the read request using the well-known port number before + * receiving the first block. Each retry of the first block will + * re-send the request. + */ + + if (blockno == 1) + { + len = tftp_mkreqpacket(packet, TFTP_RRQ, remote, binary); + server.sin_port = HTONS(CONFIG_NETUTILS_TFTP_PORT); + ret = tftp_sendto(sd, packet, len, &server); + if (ret != len) + { + goto errout_with_sd; + } + + /* Subsequent sendto will use the port number selected by the TFTP + * server in the DATA packet. Setting the server port to zero + * here indicates that we have not yet received the server port number. + */ + + server.sin_port = 0; + } + + /* Get the next packet from the server */ + + nbytesrecvd = tftp_recvfrom(sd, packet, TFTP_IOBUFSIZE, &from); + + /* Check if anything valid was received */ + + if (nbytesrecvd >= 0) + { + /* Verify the sender address and port number */ + + if (server.sin_addr.s_addr != from.sin_addr.s_addr) + { + nvdbg("Invalid address in DATA\n"); + retry--; + continue; + } + + if (server.sin_port && server.sin_port != from.sin_port) + { + nvdbg("Invalid port in DATA\n"); + len = tftp_mkerrpacket(packet, TFTP_ERR_UNKID, TFTP_ERRST_UNKID); + ret = tftp_sendto(sd, packet, len, &from); + retry--; + continue; + } + + /* Parse the incoming DATA packet */ + + if (nbytesrecvd < TFTP_DATAHEADERSIZE || + tftp_parsedatapacket(packet, &opcode, &rblockno) != 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, &from); + } + continue; + } + + /* Replace the server port to the one in the good data response */ + + if (!server.sin_port) + { + server.sin_port = from.sin_port; + } + + /* Then break out of the loop */ + + break; + } + } + + /* Did we exhaust all of the retries? */ + + if (retry == TFTP_RETRIES) + { + nvdbg("Retry limit exceeded\n"); + goto errout_with_sd; + } + + /* Write the received data chunk to the file */ + + ndatabytes = nbytesrecvd - TFTP_DATAHEADERSIZE; + tftp_dumpbuffer("Recvd DATA", packet + TFTP_DATAHEADERSIZE, ndatabytes); + if (tftp_write(fd, packet + TFTP_DATAHEADERSIZE, ndatabytes) < 0) + { + goto errout_with_sd; + } + + /* Send the acknowledgment */ + + 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); + } + while (ndatabytes >= TFTP_DATASIZE); + + /* 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 */ |