diff options
Diffstat (limited to 'apps/netutils/tftpc/tftpc_packets.c')
-rw-r--r-- | apps/netutils/tftpc/tftpc_packets.c | 330 |
1 files changed, 330 insertions, 0 deletions
diff --git a/apps/netutils/tftpc/tftpc_packets.c b/apps/netutils/tftpc/tftpc_packets.c new file mode 100644 index 000000000..d43410ff4 --- /dev/null +++ b/apps/netutils/tftpc/tftpc_packets.c @@ -0,0 +1,330 @@ +/**************************************************************************** + * netuils/tftp/tftpc_packets.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/socket.h> +#include <stdint.h> +#include <stdbool.h> +#include <stdio.h> +#include <string.h> +#include <time.h> +#include <errno.h> +#include <debug.h> + +#include <netinet/in.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 + ****************************************************************************/ + +/**************************************************************************** + * Public Data + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: tftp_mode + ****************************************************************************/ + +static inline const char *tftp_mode(bool binary) +{ + return binary ? "octet" : "netascii"; +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: tftp_sockinit + * + * Description: + * Common initialization logic: Create the socket and initialize the + * server address structure. + * + ****************************************************************************/ + +int tftp_sockinit(struct sockaddr_in *server, in_addr_t addr) +{ + struct timeval timeo; + int sd; + int ret; + + /* Create the UDP socket */ + + sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); + if (sd < 0) + { + ndbg("socket failed: %d\n", errno); + return ERROR; + } + + /* Set the recvfrom timeout */ + + timeo.tv_sec = CONFIG_NETUTILS_TFTP_TIMEOUT / 10; + timeo.tv_usec = (CONFIG_NETUTILS_TFTP_TIMEOUT % 10) * 100000; + ret = setsockopt(sd, SOL_SOCKET, SO_RCVTIMEO, &timeo, sizeof(struct timeval)); + if (ret < 0) + { + ndbg("setsockopt failed: %d\n", errno); + } + + /* Initialize the server address structure */ + + memset(server, 0, sizeof(struct sockaddr_in)); + server->sin_family = AF_INET; + server->sin_addr.s_addr = addr; + server->sin_port = HTONS(CONFIG_NETUTILS_TFTP_PORT); + return sd; +} + +/**************************************************************************** + * Name: tftp_mkreqpacket + * + * Description: + * RRQ or WRQ message format: + * + * 2 bytes: Opcode (network order == big-endian) + * N bytes: Filename + * 1 byte: 0 + * N bytes: mode + * 1 byte: 0 + * + * Return + * Then number of bytes in the request packet (never fails) + * + ****************************************************************************/ + +int tftp_mkreqpacket(uint8_t *buffer, int opcode, const char *path, bool binary) +{ + buffer[0] = opcode >> 8; + buffer[1] = opcode & 0xff; + return sprintf((char*)&buffer[2], "%s%c%s", path, 0, tftp_mode(binary)) + 3; +} + +/**************************************************************************** + * Name: tftp_mkackpacket + * + * Description: + * ACK message format: + * + * 2 bytes: Opcode (network order == big-endian) + * 2 bytes: Block number (network order == big-endian) + * + ****************************************************************************/ + +int tftp_mkackpacket(uint8_t *buffer, uint16_t blockno) +{ + buffer[0] = TFTP_ACK >> 8; + buffer[1] = TFTP_ACK & 0xff; + buffer[2] = blockno >> 8; + buffer[3] = blockno & 0xff; + return 4; +} + +/**************************************************************************** + * Name: tftp_mkerrpacket + * + * Description: + * ERROR message format: + * + * 2 bytes: Opcode (network order == big-endian) + * 2 bytes: Error number (network order == big-endian) + * N bytes: Error string + * 1 byte: 0 + * + ****************************************************************************/ + +int tftp_mkerrpacket(uint8_t *buffer, uint16_t errorcode, const char *errormsg) +{ + buffer[0] = TFTP_ERR >> 8; + buffer[1] = TFTP_ERR & 0xff; + buffer[2] = errorcode >> 8; + buffer[3] = errorcode & 0xff; + strcpy((char*)&buffer[4], errormsg); + return strlen(errormsg) + 5; +} + +/**************************************************************************** + * Name: tftp_parseerrpacket + * + * Description: + * ERROR message format: + * + * 2 bytes: Opcode (network order == big-endian) + * 2 bytes: Error number (network order == big-endian) + * N bytes: Error string + * 1 byte: 0 + * + ****************************************************************************/ + +#if defined(CONFIG_DEBUG) && defined(CONFIG_DEBUG_NET) +int tftp_parseerrpacket(const uint8_t *buffer) +{ + uint16_t opcode = (uint16_t)buffer[0] << 8 | (uint16_t)buffer[1]; + uint16_t errcode = (uint16_t)buffer[2] << 8 | (uint16_t)buffer[3]; + const char *errmsg = (const char *)&buffer[4]; + + if (opcode == TFTP_ERR) + { + ndbg("ERR message: %s (%d)\n", errmsg, errcode); + return OK; + } + return ERROR; +} +#endif + +/**************************************************************************** + * Name: tftp_recvfrom + * + * Description: + * recvfrom helper + * + ****************************************************************************/ + +ssize_t tftp_recvfrom(int sd, void *buf, size_t len, struct sockaddr_in *from) +{ + int addrlen; + ssize_t nbytes; + + /* Loop handles the case where the recvfrom is interrupted by a signal and + * we should unconditionally try again. + */ + + for (;;) + { + /* For debugging, it is helpful to start with a clean buffer */ + +#if defined(CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_NET) + memset(buf, 0, len); +#endif + + /* Receive the packet */ + + addrlen = sizeof(struct sockaddr_in); + nbytes = recvfrom(sd, buf, len, 0, (struct sockaddr*)from, (socklen_t*)&addrlen); + + /* Check for errors */ + + if (nbytes < 0) + { + /* Check for a timeout */ + + if (errno == EAGAIN) + { + ndbg("recvfrom timed out\n"); + return ERROR; + } + + /* If EINTR, then loop and try again. Other errors are fatal */ + + else if (errno != EINTR) + { + ndbg("recvfrom failed: %d\n", errno); + return ERROR; + } + } + + /* No errors? Return the number of bytes received */ + + else + { + return nbytes; + } + } +} + +/**************************************************************************** + * Name: tftp_sendto + * + * Description: + * sendto helper + * + ****************************************************************************/ + +ssize_t tftp_sendto(int sd, const void *buf, size_t len, struct sockaddr_in *to) +{ + ssize_t nbytes; + + /* Loop handles the case where the sendto is interrupted by a signal and + * we should unconditionally try again. + */ + + for (;;) + { + /* Send the packet */ + + nbytes = sendto(sd, buf, len, 0, (struct sockaddr*)to, sizeof(struct sockaddr_in)); + + /* Check for errors */ + + if (nbytes < 0) + { + /* If EINTR, then loop and try again. Other errors are fatal */ + + if (errno != EINTR) + { + ndbg("sendto failed: %d\n", errno); + return ERROR; + } + } + + /* No errors? Return the number of bytes received */ + + else + { + return nbytes; + } + } +} + +#endif /* CONFIG_NET && CONFIG_NET_UDP && CONFIG_NFILE_DESCRIPTORS */ |