516 lines
12 KiB
C
516 lines
12 KiB
C
/* $NetBSD: tftp.c,v 1.16 2003/02/01 16:42:31 wiz Exp $ */
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/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)tftp.c 8.1 (Berkeley) 6/6/93";
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#else
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__RCSID("$NetBSD: tftp.c,v 1.16 2003/02/01 16:42:31 wiz Exp $");
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#endif
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#endif /* not lint */
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/* Many bug fixes are from Jim Guyton <guyton@rand-unix> */
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/*
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* TFTP User Program -- Protocol Machines
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*/
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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 <netinet/in.h>
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#include <arpa/tftp.h>
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#include <err.h>
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#include <errno.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <netdb.h>
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#include "extern.h"
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#include "tftpsubs.h"
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extern struct sockaddr_storage peeraddr; /* filled in by main */
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extern int f; /* the opened socket */
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extern int trace;
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extern int verbose;
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extern int rexmtval;
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extern int maxtimeout;
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#define PKTSIZE SEGSIZE+4
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char ackbuf[PKTSIZE];
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int timeout;
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jmp_buf toplevel;
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jmp_buf timeoutbuf;
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static void nak __P((int, struct sockaddr *));
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static int makerequest __P((int, const char *, struct tftphdr *, const char *));
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static void printstats __P((const char *, unsigned long));
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static void startclock __P((void));
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static void stopclock __P((void));
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static void timer __P((int));
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static void tpacket __P((const char *, struct tftphdr *, int));
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static int cmpport __P((struct sockaddr *, struct sockaddr *));
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/*
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* Send the requested file.
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*/
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void
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sendfile(fd, name, mode)
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int fd;
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char *name;
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char *mode;
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{
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struct tftphdr *ap; /* data and ack packets */
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struct tftphdr *dp;
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int n;
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volatile unsigned int block;
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volatile int size, convert;
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volatile unsigned long amount;
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struct sockaddr_storage from;
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int fromlen;
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FILE *file;
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struct sockaddr_storage peer;
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struct sockaddr_storage serv; /* valid server port number */
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startclock(); /* start stat's clock */
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dp = r_init(); /* reset fillbuf/read-ahead code */
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ap = (struct tftphdr *)ackbuf;
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file = fdopen(fd, "r");
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convert = !strcmp(mode, "netascii");
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block = 0;
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amount = 0;
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memcpy(&peer, &peeraddr, peeraddr.ss_len);
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memset(&serv, 0, sizeof(serv));
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signal(SIGALRM, timer);
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do {
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if (block == 0)
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size = makerequest(WRQ, name, dp, mode) - 4;
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else {
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/* size = read(fd, dp->th_data, SEGSIZE); */
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size = readit(file, &dp, convert);
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if (size < 0) {
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nak(errno + 100, (struct sockaddr *)&peer);
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break;
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}
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dp->th_opcode = htons((u_short)DATA);
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dp->th_block = htons((u_short)block);
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}
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timeout = 0;
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(void) setjmp(timeoutbuf);
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send_data:
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if (trace)
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tpacket("sent", dp, size + 4);
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n = sendto(f, dp, size + 4, 0,
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(struct sockaddr *)&peer, peer.ss_len);
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if (n != size + 4) {
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warn("sendto");
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goto abort;
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}
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read_ahead(file, convert);
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for ( ; ; ) {
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alarm(rexmtval);
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do {
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fromlen = sizeof(from);
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n = recvfrom(f, ackbuf, sizeof(ackbuf), 0,
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(struct sockaddr *)&from, &fromlen);
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} while (n <= 0);
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alarm(0);
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if (n < 0) {
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warn("recvfrom");
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goto abort;
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}
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if (!serv.ss_family)
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serv = from;
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else if (!cmpport((struct sockaddr *)&serv,
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(struct sockaddr *)&from)) {
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warn("server port mismatch");
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goto abort;
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}
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peer = from;
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if (trace)
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tpacket("received", ap, n);
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/* should verify packet came from server */
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ap->th_opcode = ntohs(ap->th_opcode);
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ap->th_block = ntohs(ap->th_block);
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if (ap->th_opcode == ERROR) {
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printf("Error code %d: %s\n", ap->th_code,
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ap->th_msg);
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goto abort;
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}
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if (ap->th_opcode == ACK) {
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int j;
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if (ap->th_block == block) {
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break;
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}
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/* On an error, try to synchronize
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* both sides.
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*/
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j = synchnet(f);
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if (j && trace) {
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printf("discarded %d packets\n",
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j);
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}
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if (ap->th_block == (block-1)) {
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goto send_data;
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}
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}
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}
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if (block > 0)
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amount += size;
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block++;
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} while (size == SEGSIZE || block == 1);
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abort:
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fclose(file);
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stopclock();
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if (amount > 0)
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printstats("Sent", amount);
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}
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/*
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* Receive a file.
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*/
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void
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recvfile(fd, name, mode)
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int fd;
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char *name;
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char *mode;
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{
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struct tftphdr *ap;
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struct tftphdr *dp;
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int n;
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volatile unsigned int block;
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volatile int size, firsttrip;
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volatile unsigned long amount;
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struct sockaddr_storage from;
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int fromlen;
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FILE *file;
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volatile int convert; /* true if converting crlf -> lf */
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struct sockaddr_storage peer;
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struct sockaddr_storage serv; /* valid server port number */
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startclock();
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dp = w_init();
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ap = (struct tftphdr *)ackbuf;
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file = fdopen(fd, "w");
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convert = !strcmp(mode, "netascii");
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block = 1;
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firsttrip = 1;
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amount = 0;
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memcpy(&peer, &peeraddr, peeraddr.ss_len);
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memset(&serv, 0, sizeof(serv));
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signal(SIGALRM, timer);
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do {
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if (firsttrip) {
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size = makerequest(RRQ, name, ap, mode);
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firsttrip = 0;
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} else {
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ap->th_opcode = htons((u_short)ACK);
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ap->th_block = htons((u_short)(block));
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size = 4;
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block++;
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}
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timeout = 0;
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(void) setjmp(timeoutbuf);
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send_ack:
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if (trace)
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tpacket("sent", ap, size);
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if (sendto(f, ackbuf, size, 0, (struct sockaddr *)&peer,
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peer.ss_len) != size) {
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alarm(0);
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warn("sendto");
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goto abort;
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}
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write_behind(file, convert);
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for ( ; ; ) {
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alarm(rexmtval);
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do {
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fromlen = sizeof(from);
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n = recvfrom(f, dp, PKTSIZE, 0,
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(struct sockaddr *)&from, &fromlen);
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} while (n <= 0);
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alarm(0);
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if (n < 0) {
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warn("recvfrom");
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goto abort;
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}
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if (!serv.ss_family)
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serv = from;
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else if (!cmpport((struct sockaddr *)&serv,
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(struct sockaddr *)&from)) {
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warn("server port mismatch");
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goto abort;
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}
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peer = from;
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if (trace)
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tpacket("received", dp, n);
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/* should verify client address */
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dp->th_opcode = ntohs(dp->th_opcode);
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dp->th_block = ntohs(dp->th_block);
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if (dp->th_opcode == ERROR) {
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printf("Error code %d: %s\n", dp->th_code,
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dp->th_msg);
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goto abort;
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}
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if (dp->th_opcode == DATA) {
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int j;
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if (dp->th_block == block) {
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break; /* have next packet */
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}
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/* On an error, try to synchronize
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* both sides.
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*/
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j = synchnet(f);
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if (j && trace) {
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printf("discarded %d packets\n", j);
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}
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if (dp->th_block == (block-1)) {
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goto send_ack; /* resend ack */
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}
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}
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}
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/* size = write(fd, dp->th_data, n - 4); */
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size = writeit(file, &dp, n - 4, convert);
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if (size < 0) {
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nak(errno + 100, (struct sockaddr *)&peer);
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break;
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}
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amount += size;
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} while (size == SEGSIZE);
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abort: /* ok to ack, since user */
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ap->th_opcode = htons((u_short)ACK); /* has seen err msg */
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ap->th_block = htons((u_short)block);
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(void) sendto(f, ackbuf, 4, 0, (struct sockaddr *)&peer,
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peer.ss_len);
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write_behind(file, convert); /* flush last buffer */
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fclose(file);
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stopclock();
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if (amount > 0)
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printstats("Received", amount);
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}
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static int
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makerequest(request, name, tp, mode)
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int request;
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const char *name;
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struct tftphdr *tp;
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const char *mode;
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{
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char *cp;
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tp->th_opcode = htons((u_short)request);
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#ifndef __SVR4
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cp = tp->th_stuff;
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#else
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cp = (void *)&tp->th_stuff;
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#endif
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strcpy(cp, name);
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cp += strlen(name);
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*cp++ = '\0';
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strcpy(cp, mode);
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cp += strlen(mode);
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*cp++ = '\0';
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return (cp - (char *)tp);
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}
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const struct errmsg {
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int e_code;
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const char *e_msg;
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} errmsgs[] = {
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{ EUNDEF, "Undefined error code" },
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{ ENOTFOUND, "File not found" },
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{ EACCESS, "Access violation" },
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{ ENOSPACE, "Disk full or allocation exceeded" },
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{ EBADOP, "Illegal TFTP operation" },
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{ EBADID, "Unknown transfer ID" },
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{ EEXISTS, "File already exists" },
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{ ENOUSER, "No such user" },
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{ -1, 0 }
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};
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/*
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* Send a nak packet (error message).
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* Error code passed in is one of the
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* standard TFTP codes, or a UNIX errno
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* offset by 100.
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*/
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static void
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nak(error, peer)
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int error;
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struct sockaddr *peer;
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{
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const struct errmsg *pe;
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struct tftphdr *tp;
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int length;
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size_t msglen;
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tp = (struct tftphdr *)ackbuf;
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tp->th_opcode = htons((u_short)ERROR);
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msglen = sizeof(ackbuf) - (&tp->th_msg[0] - ackbuf);
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for (pe = errmsgs; pe->e_code >= 0; pe++)
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if (pe->e_code == error)
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break;
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if (pe->e_code < 0) {
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tp->th_code = EUNDEF;
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strlcpy(tp->th_msg, strerror(error - 100), msglen);
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} else {
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tp->th_code = htons((u_short)error);
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strlcpy(tp->th_msg, pe->e_msg, msglen);
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}
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length = strlen(tp->th_msg);
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msglen = &tp->th_msg[length + 1] - ackbuf;
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if (trace)
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tpacket("sent", tp, (int)msglen);
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if (sendto(f, ackbuf, msglen, 0, peer, peer->sa_len) != msglen)
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warn("nak");
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}
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static void
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tpacket(s, tp, n)
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const char *s;
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struct tftphdr *tp;
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int n;
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{
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static char *opcodes[] =
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{ "#0", "RRQ", "WRQ", "DATA", "ACK", "ERROR" };
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char *cp, *file;
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u_short op = ntohs(tp->th_opcode);
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if (op < RRQ || op > ERROR)
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printf("%s opcode=%x ", s, op);
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else
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printf("%s %s ", s, opcodes[op]);
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switch (op) {
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case RRQ:
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case WRQ:
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n -= 2;
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#ifndef __SVR4
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cp = tp->th_stuff;
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#else
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cp = (void *) &tp->th_stuff;
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#endif
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file = cp;
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cp = strchr(cp, '\0');
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printf("<file=%s, mode=%s>\n", file, cp + 1);
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break;
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case DATA:
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printf("<block=%d, %d bytes>\n", ntohs(tp->th_block), n - 4);
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break;
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case ACK:
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printf("<block=%d>\n", ntohs(tp->th_block));
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break;
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case ERROR:
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printf("<code=%d, msg=%s>\n", ntohs(tp->th_code), tp->th_msg);
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break;
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}
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}
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struct timeval tstart;
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struct timeval tstop;
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static void
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startclock()
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{
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(void)gettimeofday(&tstart, NULL);
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}
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static void
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stopclock()
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{
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(void)gettimeofday(&tstop, NULL);
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}
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static void
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printstats(direction, amount)
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const char *direction;
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unsigned long amount;
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{
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double delta;
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/* compute delta in 1/10's second units */
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delta = ((tstop.tv_sec*10.)+(tstop.tv_usec/100000)) -
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((tstart.tv_sec*10.)+(tstart.tv_usec/100000));
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delta = delta/10.; /* back to seconds */
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printf("%s %ld bytes in %.1f seconds", direction, amount, delta);
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if (verbose)
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printf(" [%.0f bits/sec]", (amount*8.)/delta);
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putchar('\n');
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}
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static void
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timer(sig)
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int sig;
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{
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timeout += rexmtval;
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if (timeout >= maxtimeout) {
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printf("Transfer timed out.\n");
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longjmp(toplevel, -1);
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}
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longjmp(timeoutbuf, 1);
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}
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static int
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cmpport(sa, sb)
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struct sockaddr *sa;
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struct sockaddr *sb;
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{
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char a[NI_MAXSERV], b[NI_MAXSERV];
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if (getnameinfo(sa, sa->sa_len, NULL, 0, a, sizeof(a), NI_NUMERICSERV))
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return 0;
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if (getnameinfo(sb, sb->sa_len, NULL, 0, b, sizeof(b), NI_NUMERICSERV))
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return 0;
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if (strcmp(a, b) != 0)
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return 0;
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return 1;
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}
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