/**************************************************************************** * netuils/tftp/tftpc_put.c * * Copyright (C) 2008 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include #include #include #include #include #include #include #include #include #include "tftpc_internal.h" #if defined(CONFIG_NET) && defined(CONFIG_NET_UDP) && CONFIG_NFILE_DESCRIPTORS > 0 /**************************************************************************** * Definitions ****************************************************************************/ #define TFTP_RETRIES 3 /**************************************************************************** * Private Function Prototypes ****************************************************************************/ /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: tftp_read ****************************************************************************/ static inline ssize_t tftp_read(int fd, ubyte *buf, size_t buflen) { ssize_t nbytesread; ssize_t totalread = 0; while (totalread < buflen) { /* Read the data... repeating the read in the event that it was * interrupted by a signal. */ do { nbytesread = read(fd, buf, buflen - totalread); } while (nbytesread < 0 && errno == EINTR); /* Check for non-EINTR errors */ if (nbytesread < 0) { ndbg("read failed: %d\n", errno); return ERROR; } /* Check for end of file */ else if (nbytesread == 0) { break; } /* Handle partial reads. Partial reads can happen normally * when the source is some device driver that returns data * in bits and pieces as received (such as a pipe) */ totalread += nbytesread; buf += nbytesread; } return totalread; } /**************************************************************************** * Name: tftp_mkdatapacket * * Description: * DATA message format: * * 2 bytes: Opcode (network order == big-endian) * 2 bytes: Block number (network order == big-endian) * N bytes: Data (where N <= 512) * * Input Parameters: * fd - File descriptor used to read from the file * offset - File offset to read from * packet - Buffer to write the data packet into * blockno - The block number of the packet * * Return Value: * Number of bytes read into the packet. > 8; packet[1] = TFTP_DATA & 0xff; packet[2] = blockno >> 8; packet[3] = blockno & 0xff; /* Seek to the correct offset in the file */ tmp = lseek(fd, offset, SEEK_SET); if (tmp == (off_t)-1) { ndbg("lseek failed: %d\n", errno); return ERROR; } /* Read the file data into the packet buffer */ nbytesread = tftp_read(fd, &packet[TFTP_DATAHEADERSIZE], TFTP_DATASIZE); if (nbytesread < 0) { return ERROR; } return nbytesread + TFTP_DATAHEADERSIZE; } /**************************************************************************** * Name: tftp_rcvack * * Description: * ACK message format: * * 2 bytes: Opcode (network order == big-endian) * 2 bytes: Block number (network order == big-endian) * * Input Parameters: * sd - Socket descriptor to use in in the transfer * packet - buffer to use for the tranfers * server - The address of the server * port - The port number of the server (0 if not yet known) * blockno - Location to return block number in the received ACK * * Returned Value: * OK:success and blockno valid, ERROR:failure. * ****************************************************************************/ static int tftp_rcvack(int sd, ubyte *packet, struct sockaddr_in *server, uint16 *port, uint16 *blockno) { struct sockaddr_in from; /* The address the last UDP message recv'd from */ ssize_t nbytes; /* The number of bytes received. */ uint16 opcode; /* The received opcode */ uint16 rblockno; /* The received block number */ int packetlen; /* Packet length */ int retry; /* Retry counter */ /* Try up to TFTP_RETRIES times */ for (retry = 0; retry < TFTP_RETRIES; retry++) { /* Try for until a valid ACK is received or some error occurs */ for (;;) { /* Receive the next UDP packet from the server */ nbytes = tftp_recvfrom(sd, packet, TFTP_IOBUFSIZE, &from); if (nbytes < TFTP_ACKHEADERSIZE) { /* Failed to receive a good packet */ if (nbytes >= 0) { ndbg("tftp_recvfrom short packet: %d bytes\n", nbytes); } /* Break out to bump up the retry count */ break; } else { /* Get the port being used by the server if that has not yet been established */ if (!*port) { *port = from.sin_port; server->sin_port = from.sin_port; } /* Verify that the packet was received from the correct host and port */ if (server->sin_addr.s_addr != from.sin_addr.s_addr) { nvdbg("Invalid address in DATA\n"); continue; } if (*port != server->sin_port) { nvdbg("Invalid port in DATA\n"); packetlen = tftp_mkerrpacket(packet, TFTP_ERR_UNKID, TFTP_ERRST_UNKID); (void)tftp_sendto(sd, packet, packetlen, server); continue; } /* Parse the error message */ opcode = (uint16)packet[0] << 8 | (uint16)packet[1]; rblockno = (uint16)packet[2] << 8 | (uint16)packet[3]; /* Verify that the message that we received is an ACK for the * expected block number. */ if (opcode != TFTP_ACK) { nvdbg("Bad opcode\n"); #if defined(CONFIG_DEBUG) && defined(CONFIG_DEBUG_NET) if (opcode == TFTP_ERR) { (void)tftp_parseerrpacket(packet); } else #endif if (opcode > TFTP_MAXRFC1350) { packetlen = tftp_mkerrpacket(packet, TFTP_ERR_ILLEGALOP, TFTP_ERRST_ILLEGALOP); (void)tftp_sendto(sd, packet, packetlen, server); } /* Break out an bump up the retry count */ break; } /* Success! */ nvdbg("Received ACK for block %d\n", rblockno); *blockno = rblockno; return OK; } } } /* We have tried TFTP_RETRIES times */ ndbg("Timeout, Waiting for ACK\n"); return ERROR; /* Will never get here */ } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: tftpput * * Input Parameters: * local - Path to the file system object to be sent. * remote - The name of the file on the TFTP server. * addr - The IP address of the server in network order * binary - TRUE: Perform binary ('octect') transfer * FALSE: Perform text ('netascii') transfer * ****************************************************************************/ int tftpput(const char *local, const char *remote, in_addr_t addr, boolean binary) { struct sockaddr_in server; /* The address of the TFTP server */ ubyte *packet; /* Allocated memory to hold one packet */ off_t offset; /* Offset into source file */ uint16 blockno; /* The current transfer block number */ uint16 rblockno; /* The ACK'ed block number */ uint16 port = 0; /* This is the port number for the transfer */ int packetlen; /* The length of the data packet */ int sd; /* Socket descriptor for socket I/O */ int fd; /* File descriptor for file I/O */ int retry; /* Retry counter */ int result = ERROR; /* Assume failure */ int ret; /* Generic return status */ /* Allocate the buffer to used for socket/disk I/O */ packet = (ubyte*)zalloc(TFTP_IOBUFSIZE); if (!packet) { ndbg("packet memory allocation failure\n"); errno = ENOMEM; goto errout; } /* Open the file for reading */ fd = open(local, O_RDONLY); 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; } /* Send the write request using the well known port. This may need * to be done several times because (1) UDP is inherenly unreliable * and packets may be lost normally, and (2) uIP has a nasty habit * of droppying packets if there is nothing hit in the ARP table. */ blockno = 1; retry = 0; for (;;) { packetlen = tftp_mkreqpacket(packet, TFTP_WRQ, remote, binary); ret = tftp_sendto(sd, packet, packetlen, &server); if (ret != packetlen) { goto errout_with_sd; } /* Receive the ACK for the write request */ if (tftp_rcvack(sd, packet, &server, &port, NULL) == 0) { break; } ndbg("Re-sending request\n"); /* We are going to loop and re-send the request packet. Check the * retry count so that we do not loop forever. */ if (++retry > TFTP_RETRIES) { ndbg("Retry count exceeded\n"); errno = ETIMEDOUT; goto errout_with_sd; } } /* Then loop sending the entire file to the server in chunks */ offset = 0; retry = 0; for (;;) { /* Construct the next data packet */ packetlen = tftp_mkdatapacket(fd, offset, packet, blockno); if (packetlen < 0) { goto errout_with_sd; } /* Send the next data chunk */ ret = tftp_sendto(sd, packet, packetlen, &server); if (ret != packetlen) { goto errout_with_sd; } /* Check for an ACK for the data chunk */ if (tftp_rcvack(sd, packet, &server, &port, &rblockno) == OK) { /* Check if the packet that we just sent was ACK'ed. If not, * we just loop to resend the same packet (same blockno, same * file offset). */ if (rblockno == blockno) { /* Yes.. If we are at the end of the file and if all of the packets * have been ACKed, then we are done. */ if (packetlen < TFTP_PACKETSIZE) { break; } /* Not the last block.. set up for the next block */ blockno++; offset += TFTP_DATASIZE; retry = 0; /* Skip the retry test */ continue; } } /* We are going to loop and re-send the data packet. Check the retry * count so that we do not loop forever. */ if (++retry > TFTP_RETRIES) { ndbg("Retry count exceeded\n"); errno = ETIMEDOUT; goto errout_with_sd; } } /* 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 */