mirror of
https://github.com/sheumann/hush.git
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383 lines
8.7 KiB
C
383 lines
8.7 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 and 512-byte data blocks are supported. */
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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 BB_FEATURE_TFTP_DEBUG
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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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static inline int tftp(const int cmd, const struct hostent *host,
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const char *serverfile, 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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RESERVE_BB_BUFFER(buf, tftp_bufsize + 4); // Why 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 = 1; // read request = 1
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}
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if (cmd_put) {
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opcode = 2; // write request = 2
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}
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while (1) {
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/* build packet of type "opcode" */
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cp = buf;
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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 == 1)) || // read request = 1
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(cmd_put && (opcode == 2))) { // write request = 2
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/* what is this trying to do ? */
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while (cp != &buf[tftp_bufsize - 1]) {
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if ((*cp = *serverfile++) == '\0')
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break;
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cp++;
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}
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/* and this ? */
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if ((*cp != '\0') || (&buf[tftp_bufsize - 1] - cp) < 7) {
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error_msg("too long server-filename");
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break;
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}
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memcpy(cp + 1, "octet", 6);
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cp += 7;
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}
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/* add ack and data */
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if ((cmd_get && (opcode == 4)) || // acknowledgement = 4
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(cmd_put && (opcode == 3))) { // data packet == 3
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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 == 3)) { // data packet == 3
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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 BB_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 = 5; // BB_TFPT_TIMEOUT = 5
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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 BB_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 (cmd_get && (opcode == 3)) { // data packet == 3
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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 = 4; // acknowledgement = 4
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continue;
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}
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}
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if (cmd_put && (opcode == 4)) { // acknowledgement = 4
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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 = 3; // data packet == 3
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continue;
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}
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}
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if (opcode == 5) { // error code == 5
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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) / 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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}
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close(socketfd);
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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 = 512;
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while ((opt = getopt(argc, argv, "b:gpl:r:")) != -1) {
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switch (opt) {
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case 'b':
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blocksize = atoi(optarg);
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break;
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#ifdef BB_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 BB_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 BB_FEATURE_TFTP_DEBUG
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printf("using server \"%s\", serverfile \"%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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close(fd);
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return(result);
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} |