577 lines
12 KiB
C
577 lines
12 KiB
C
/* ------------------------------------------------------------------------- */
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/* tftp.c */
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/* */
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/* A simple tftp client for busybox. */
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/* Tries to follow RFC1350. */
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/* Only "octet" mode supported. */
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/* Optional blocksize negotiation (RFC2347 + RFC2348) */
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/* */
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/* Copyright (C) 2001 Magnus Damm <damm@opensource.se> */
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/* */
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/* Parts of the code based on: */
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/* */
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/* atftp: Copyright (C) 2000 Jean-Pierre Lefebvre <helix@step.polymtl.ca> */
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/* and Remi Lefebvre <remi@debian.org> */
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/* */
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/* utftp: Copyright (C) 1999 Uwe Ohse <uwe@ohse.de> */
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/* */
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/* This program is free software; you can redistribute it and/or modify */
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/* it under the terms of the GNU General Public License as published by */
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/* the Free Software Foundation; either version 2 of the License, or */
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/* (at your option) any later version. */
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/* */
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/* This program is distributed in the hope that it will be useful, */
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/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
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/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU */
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/* General Public License for more details. */
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/* */
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/* You should have received a copy of the GNU General Public License */
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/* along with this program; if not, write to the Free Software */
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/* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/* */
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/* ------------------------------------------------------------------------- */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/stat.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "busybox.h"
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//#define CONFIG_FEATURE_TFTP_DEBUG
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#define TFTP_BLOCKSIZE_DEFAULT 512 /* according to RFC 1350, don't change */
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#define TFTP_TIMEOUT 5 /* seconds */
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/* opcodes we support */
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#define TFTP_RRQ 1
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#define TFTP_WRQ 2
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#define TFTP_DATA 3
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#define TFTP_ACK 4
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#define TFTP_ERROR 5
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#define TFTP_OACK 6
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static const char *tftp_error_msg[] = {
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"Undefined error",
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"File not found",
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"Access violation",
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"Disk full or allocation error",
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"Illegal TFTP operation",
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"Unknown transfer ID",
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"File already exists",
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"No such user"
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};
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const int tftp_cmd_get = 1;
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const int tftp_cmd_put = 2;
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#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
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static int tftp_blocksize_check(int blocksize, int bufsize)
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{
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/* Check if the blocksize is valid:
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* RFC2348 says between 8 and 65464,
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* but our implementation makes it impossible
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* to use blocksizes smaller than 22 octets.
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*/
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if ((bufsize && (blocksize > bufsize)) ||
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(blocksize < 8) || (blocksize > 65464)) {
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error_msg("bad blocksize");
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return 0;
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}
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return blocksize;
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}
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static char *tftp_option_get(char *buf, int len, char *option)
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{
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int opt_val = 0;
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int opt_found = 0;
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int k;
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while (len > 0) {
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/* Make sure the options are terminated correctly */
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for (k = 0; k < len; k++) {
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if (buf[k] == '\0') {
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break;
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}
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}
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if (k >= len) {
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break;
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}
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if (opt_val == 0) {
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if (strcasecmp(buf, option) == 0) {
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opt_found = 1;
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}
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}
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else {
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if (opt_found) {
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return buf;
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}
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}
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k++;
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buf += k;
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len -= k;
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opt_val ^= 1;
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}
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return NULL;
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}
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#endif
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static inline int tftp(const int cmd, const struct hostent *host,
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const char *remotefile, int localfd, const int port, int tftp_bufsize)
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{
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const int cmd_get = cmd & tftp_cmd_get;
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const int cmd_put = cmd & tftp_cmd_put;
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const int bb_tftp_num_retries = 5;
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struct sockaddr_in sa;
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struct sockaddr_in from;
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struct timeval tv;
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socklen_t fromlen;
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fd_set rfds;
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char *cp;
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unsigned short tmp;
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int socketfd;
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int len;
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int opcode = 0;
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int finished = 0;
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int timeout = bb_tftp_num_retries;
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int block_nr = 1;
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#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
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int want_option_ack = 0;
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#endif
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/* Can't use RESERVE_CONFIG_BUFFER here since the allocation
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* size varies meaning BUFFERS_GO_ON_STACK would fail */
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char *buf=xmalloc(tftp_bufsize + 4);
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tftp_bufsize += 4;
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if ((socketfd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
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perror_msg("socket");
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return EXIT_FAILURE;
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}
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len = sizeof(sa);
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memset(&sa, 0, len);
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bind(socketfd, (struct sockaddr *)&sa, len);
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sa.sin_family = host->h_addrtype;
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sa.sin_port = htons(port);
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memcpy(&sa.sin_addr, (struct in_addr *) host->h_addr,
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sizeof(sa.sin_addr));
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/* build opcode */
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if (cmd_get) {
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opcode = TFTP_RRQ;
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}
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if (cmd_put) {
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opcode = TFTP_WRQ;
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}
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while (1) {
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cp = buf;
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/* first create the opcode part */
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*((unsigned short *) cp) = htons(opcode);
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cp += 2;
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/* add filename and mode */
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if ((cmd_get && (opcode == TFTP_RRQ)) ||
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(cmd_put && (opcode == TFTP_WRQ))) {
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int too_long = 0;
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/* see if the filename fits into buf */
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/* and fill in packet */
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len = strlen(remotefile) + 1;
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if ((cp + len) >= &buf[tftp_bufsize - 1]) {
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too_long = 1;
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}
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else {
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safe_strncpy(cp, remotefile, len);
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cp += len;
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}
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if (too_long || ((&buf[tftp_bufsize - 1] - cp) < 6)) {
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error_msg("too long remote-filename");
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break;
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}
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/* add "mode" part of the package */
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memcpy(cp, "octet", 6);
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cp += 6;
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#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
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len = tftp_bufsize - 4; /* data block size */
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if (len != TFTP_BLOCKSIZE_DEFAULT) {
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if ((&buf[tftp_bufsize - 1] - cp) < 15) {
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error_msg("too long remote-filename");
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break;
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}
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/* add "blksize" + number of blocks */
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memcpy(cp, "blksize", 8);
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cp += 8;
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cp += snprintf(cp, 6, "%d", len) + 1;
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want_option_ack = 1;
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}
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#endif
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}
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/* add ack and data */
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if ((cmd_get && (opcode == TFTP_ACK)) ||
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(cmd_put && (opcode == TFTP_DATA))) {
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*((unsigned short *) cp) = htons(block_nr);
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cp += 2;
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block_nr++;
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if (cmd_put && (opcode == TFTP_DATA)) {
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len = read(localfd, cp, tftp_bufsize - 4);
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if (len < 0) {
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perror_msg("read");
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break;
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}
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if (len != (tftp_bufsize - 4)) {
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finished++;
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}
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cp += len;
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} else if (finished) {
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break;
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}
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}
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/* send packet */
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do {
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len = cp - buf;
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#ifdef CONFIG_FEATURE_TFTP_DEBUG
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printf("sending %u bytes\n", len);
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for (cp = buf; cp < &buf[len]; cp++)
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printf("%02x ", *cp);
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printf("\n");
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#endif
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if (sendto(socketfd, buf, len, 0,
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(struct sockaddr *) &sa, sizeof(sa)) < 0) {
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perror_msg("send");
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len = -1;
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break;
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}
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/* receive packet */
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memset(&from, 0, sizeof(from));
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fromlen = sizeof(from);
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tv.tv_sec = TFTP_TIMEOUT;
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tv.tv_usec = 0;
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FD_ZERO(&rfds);
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FD_SET(socketfd, &rfds);
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switch (select(FD_SETSIZE, &rfds, NULL, NULL, &tv)) {
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case 1:
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len = recvfrom(socketfd, buf, tftp_bufsize, 0,
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(struct sockaddr *) &from, &fromlen);
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if (len < 0) {
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perror_msg("recvfrom");
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break;
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}
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timeout = 0;
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if (sa.sin_port == htons(port)) {
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sa.sin_port = from.sin_port;
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}
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if (sa.sin_port == from.sin_port) {
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break;
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}
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/* fall-through for bad packets! */
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/* discard the packet - treat as timeout */
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timeout = bb_tftp_num_retries;
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case 0:
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error_msg("timeout");
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if (timeout == 0) {
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len = -1;
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error_msg("last timeout");
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} else {
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timeout--;
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}
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break;
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default:
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perror_msg("select");
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len = -1;
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}
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} while (timeout && (len >= 0));
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if (len < 0) {
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break;
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}
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/* process received packet */
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opcode = ntohs(*((unsigned short *) buf));
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tmp = ntohs(*((unsigned short *) &buf[2]));
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#ifdef CONFIG_FEATURE_TFTP_DEBUG
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printf("received %d bytes: %04x %04x\n", len, opcode, tmp);
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#endif
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if (opcode == TFTP_ERROR) {
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char *msg = NULL;
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if (buf[4] != '\0') {
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msg = &buf[4];
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buf[tftp_bufsize - 1] = '\0';
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} else if (tmp < (sizeof(tftp_error_msg)
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/ sizeof(char *))) {
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msg = (char *) tftp_error_msg[tmp];
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}
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if (msg) {
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error_msg("server says: %s", msg);
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}
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break;
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}
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#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
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if (want_option_ack) {
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want_option_ack = 0;
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if (opcode == TFTP_OACK) {
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/* server seems to support options */
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char *res;
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res = tftp_option_get(&buf[2], len-2,
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"blksize");
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if (res) {
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int foo = atoi(res);
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if (tftp_blocksize_check(foo,
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tftp_bufsize - 4)) {
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if (cmd_put) {
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opcode = TFTP_DATA;
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}
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else {
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opcode = TFTP_ACK;
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}
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#ifdef CONFIG_FEATURE_TFTP_DEBUG
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printf("using blksize %u\n");
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#endif
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tftp_bufsize = foo + 4;
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block_nr = 0;
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continue;
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}
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}
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/* FIXME:
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* we should send ERROR 8 */
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error_msg("bad server option");
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break;
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}
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error_msg("warning: blksize not supported by server"
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" - reverting to 512");
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tftp_bufsize = TFTP_BLOCKSIZE_DEFAULT + 4;
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}
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#endif
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if (cmd_get && (opcode == TFTP_DATA)) {
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if (tmp == block_nr) {
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len = write(localfd, &buf[4], len - 4);
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if (len < 0) {
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perror_msg("write");
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break;
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}
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if (len != (tftp_bufsize - 4)) {
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finished++;
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}
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opcode = TFTP_ACK;
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continue;
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}
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}
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if (cmd_put && (opcode == TFTP_ACK)) {
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if (tmp == (block_nr - 1)) {
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if (finished) {
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break;
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}
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opcode = TFTP_DATA;
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continue;
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}
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}
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}
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#ifdef CONFIG_FEATURE_CLEAN_UP
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close(socketfd);
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RELEASE_CONFIG_BUFFER(buf);
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#endif
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return finished ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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int tftp_main(int argc, char **argv)
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{
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struct hostent *host = NULL;
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char *localfile = NULL;
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char *remotefile = NULL;
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int port = 69;
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int cmd = 0;
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int fd = -1;
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int flags = 0;
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int opt;
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int result;
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int blocksize = TFTP_BLOCKSIZE_DEFAULT;
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/* figure out what to pass to getopt */
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#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
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#define BS "b:"
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#else
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#define BS
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#endif
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#ifdef CONFIG_FEATURE_TFTP_GET
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#define GET "g"
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#else
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#define GET
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#endif
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#ifdef CONFIG_FEATURE_TFTP_PUT
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#define PUT "p"
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#else
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#define PUT
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#endif
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while ((opt = getopt(argc, argv, BS GET PUT "l:r:")) != -1) {
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switch (opt) {
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#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
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case 'b':
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blocksize = atoi(optarg);
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if (!tftp_blocksize_check(blocksize, 0)) {
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return EXIT_FAILURE;
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}
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break;
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#endif
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#ifdef CONFIG_FEATURE_TFTP_GET
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case 'g':
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cmd = tftp_cmd_get;
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flags = O_WRONLY | O_CREAT;
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break;
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#endif
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#ifdef CONFIG_FEATURE_TFTP_PUT
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case 'p':
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cmd = tftp_cmd_put;
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flags = O_RDONLY;
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break;
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#endif
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case 'l':
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localfile = xstrdup(optarg);
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break;
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case 'r':
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remotefile = xstrdup(optarg);
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break;
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}
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}
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if ((cmd == 0) || (optind == argc)) {
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show_usage();
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}
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fd = open(localfile, flags, 0644);
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if (fd < 0) {
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perror_msg_and_die("local file");
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}
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host = xgethostbyname(argv[optind]);
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if (optind + 2 == argc) {
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port = atoi(argv[optind + 1]);
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}
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#ifdef CONFIG_FEATURE_TFTP_DEBUG
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printf("using server \"%s\", remotefile \"%s\", "
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"localfile \"%s\".\n",
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inet_ntoa(*((struct in_addr *) host->h_addr)),
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remotefile, localfile);
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#endif
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result = tftp(cmd, host, remotefile, fd, port, blocksize);
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#ifdef CONFIG_FEATURE_CLEAN_UP
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close(fd);
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#endif
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return(result);
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}
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