537 lines
12 KiB
C
537 lines
12 KiB
C
/*
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* Copyright (c) 1983 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)tftp.c 5.7 (Berkeley) 6/29/88";
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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 <signal.h>
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#include <stdio.h>
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#include <errno.h>
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#include <setjmp.h>
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extern int errno;
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extern struct sockaddr_in sin; /* 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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extern int segsize;
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#define PKTSIZE (1432+4) /* 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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#ifndef OACK
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#define OACK 6
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#endif
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void timer(int sig)
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{
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signal(SIGALRM, timer);
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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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strnlen(s, n)
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char *s;
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int n;
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{
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int i = 0;
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while (n-- > 0 && *s++) i++;
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return(i);
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}
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/*
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* Parse an OACK package and set blocksize accordingly
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*/
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parseoack(cp, sz)
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char *cp;
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int sz;
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{
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int n;
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segsize = 512;
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while (sz > 0 && *cp) {
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n = strnlen(cp, sz);
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if (n == 7 && !strncmp("blksize", cp, 7)) {
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cp += 8;
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sz -= 8;
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if (sz <= 0)
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break;
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for (segsize = 0, n = strnlen(cp, sz); n > 0;
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n--, cp++, sz--) {
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if (*cp < '0' || *cp > '9')
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break;
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segsize = 10*segsize + *cp - '0'; }
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}
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cp += n + 1;
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sz -= n + 1;
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}
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if (segsize < 8 || segsize > 1432) {
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printf("Remote host negotiated illegal blocksize %d\n",
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segsize);
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segsize = 512;
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longjmp(timeoutbuf, -1);
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}
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}
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/*
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* Send the requested file.
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*/
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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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register struct tftphdr *ap; /* data and ack packets */
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struct tftphdr *r_init(), *dp;
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register int size, n;
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u_short block = 0;
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register unsigned long amount = 0;
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struct sockaddr_in from;
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int fromlen;
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int convert; /* true if doing nl->crlf conversion */
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FILE *file;
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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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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);
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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(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, (struct sockaddr *)&sin,
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sizeof (sin));
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if (n != size + 4) {
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perror("tftp: sendto");
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goto abort;
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}
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if (block) /* do not start reading until the blocksize
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has been negotiated */
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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,
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&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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perror("tftp: recvfrom");
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goto abort;
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}
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sin.sin_port = from.sin_port; /* added */
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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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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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ap->th_block = ntohs(ap->th_block);
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if (block == 0) {
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if (trace)
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printf("server does not know "
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"about RFC1782; reset"
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"ting blocksize\n");
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segsize = 512;
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}
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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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else if (ap->th_opcode == OACK) {
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if (block) {
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printf("protocol violation\n");
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longjmp(toplevel, -1);
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}
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parseoack(&ap->th_stuff, n - 2);
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break;
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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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else
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read_ahead(file, convert);
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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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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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register struct tftphdr *ap;
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struct tftphdr *dp, *w_init();
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register int n, size;
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u_short block = 1;
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unsigned long amount = 0;
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struct sockaddr_in from;
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int fromlen, firsttrip = 1;
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FILE *file;
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int convert; /* true if converting crlf -> lf */
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int waitforoack = 1;
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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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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(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 *)&sin,
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sizeof (sin)) != size) {
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alarm(0);
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perror("tftp: sendto");
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goto abort;
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}
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if (!waitforoack)
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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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perror("tftp: recvfrom");
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goto abort;
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}
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sin.sin_port = from.sin_port; /* added */
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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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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 (waitforoack) {
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if (trace)
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printf("server does not know "
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"about RFC1782; reset"
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"ting blocksize\n");
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waitforoack = 0;
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segsize = 512;
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}
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dp->th_block = ntohs(dp->th_block);
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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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else if (dp->th_opcode == OACK) {
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if (block != 1 || !waitforoack) {
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printf("protocol violation\n");
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longjmp(toplevel, -1);
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}
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waitforoack = 0;
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parseoack(&dp->th_stuff, n - 2);
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ap->th_opcode = htons((u_short)ACK);
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ap->th_block = htons(0);
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size = 4;
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goto send_ack;
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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);
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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(block);
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(void) sendto(f, ackbuf, 4, 0, (struct sockaddr *)&sin, sizeof (sin));
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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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makerequest(request, name, tp, mode)
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int request;
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char *name, *mode;
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struct tftphdr *tp;
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{
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register char *cp;
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tp->th_opcode = htons((u_short)request);
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cp = tp->th_stuff;
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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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strcpy(cp, "blksize");
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cp += 7;
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*cp++ = '\0';
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sprintf(cp, "%d", segsize);
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cp += strlen(cp) + 1;
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return (cp - (char *)tp);
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}
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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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nak(error)
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int error;
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{
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register struct tftphdr *tp;
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int length;
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register struct errmsg *pe;
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/* extern char *sys_errlist[]; */
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tp = (struct tftphdr *)ackbuf;
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tp->th_opcode = htons((u_short)ERROR);
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tp->th_code = htons((u_short)error);
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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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pe->e_msg = sys_errlist[error - 100];
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tp->th_code = EUNDEF;
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}
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strcpy(tp->th_msg, pe->e_msg);
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length = strlen(pe->e_msg) + 4;
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if (trace)
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tpacket("sent", tp, length);
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if (sendto(f, ackbuf, length, 0, (struct sockaddr *)&sin, sizeof (sin))
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!= length)
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perror("nak");
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}
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topts(cp, sz)
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char *cp;
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int sz;
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{
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int n, i = 0;
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while (sz > 0 && *cp) {
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n = strnlen(cp, sz);
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if (n > 0) {
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printf("%s%s=", i++ ? ", " : "", cp);
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cp += n + 1;
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sz -= n + 1;
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if (sz <= 0)
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break;
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n = strnlen(cp, sz);
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if (n > 0)
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printf("%s", cp);
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}
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cp += n + 1;
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sz -= n + 1;
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}
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}
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tpacket(s, tp, n)
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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", "OACK" };
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register char *cp, *file;
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u_short op = ntohs(tp->th_opcode);
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char *index();
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if (op < RRQ || op > OACK)
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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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file = cp = tp->th_stuff;
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cp = index(cp, '\0');
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printf("<file=%s, mode=%s, opts: ", file, cp + 1);
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topts(index(cp + 1, '\000') + 1, n - strlen(file)
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- strlen(cp + 1) - 2);
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printf(">\n");
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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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case OACK:
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printf("<");
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topts(tp->th_stuff, n - 2);
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printf(">\n");
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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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struct timezone zone;
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startclock() {
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gettimeofday(&tstart, &zone);
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}
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stopclock() {
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gettimeofday(&tstop, &zone);
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}
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printstats(direction, amount)
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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) && (delta >= 0.1))
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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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