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xNBA/contrib/tftp/tftp.c
2005-05-17 16:44:57 +00:00

537 lines
12 KiB
C

/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static char sccsid[] = "@(#)tftp.c 5.7 (Berkeley) 6/29/88";
#endif /* not lint */
/* Many bug fixes are from Jim Guyton <guyton@rand-unix> */
/*
* TFTP User Program -- Protocol Machines
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <arpa/tftp.h>
#include <signal.h>
#include <stdio.h>
#include <errno.h>
#include <setjmp.h>
extern int errno;
extern struct sockaddr_in sin; /* filled in by main */
extern int f; /* the opened socket */
extern int trace;
extern int verbose;
extern int rexmtval;
extern int maxtimeout;
extern int segsize;
#define PKTSIZE (1432+4) /* SEGSIZE+4 */
char ackbuf[PKTSIZE];
int timeout;
jmp_buf toplevel;
jmp_buf timeoutbuf;
#ifndef OACK
#define OACK 6
#endif
void timer(int sig)
{
signal(SIGALRM, timer);
timeout += rexmtval;
if (timeout >= maxtimeout) {
printf("Transfer timed out.\n");
longjmp(toplevel, -1);
}
longjmp(timeoutbuf, 1);
}
strnlen(s, n)
char *s;
int n;
{
int i = 0;
while (n-- > 0 && *s++) i++;
return(i);
}
/*
* Parse an OACK package and set blocksize accordingly
*/
parseoack(cp, sz)
char *cp;
int sz;
{
int n;
segsize = 512;
while (sz > 0 && *cp) {
n = strnlen(cp, sz);
if (n == 7 && !strncmp("blksize", cp, 7)) {
cp += 8;
sz -= 8;
if (sz <= 0)
break;
for (segsize = 0, n = strnlen(cp, sz); n > 0;
n--, cp++, sz--) {
if (*cp < '0' || *cp > '9')
break;
segsize = 10*segsize + *cp - '0'; }
}
cp += n + 1;
sz -= n + 1;
}
if (segsize < 8 || segsize > 1432) {
printf("Remote host negotiated illegal blocksize %d\n",
segsize);
segsize = 512;
longjmp(timeoutbuf, -1);
}
}
/*
* Send the requested file.
*/
sendfile(fd, name, mode)
int fd;
char *name;
char *mode;
{
register struct tftphdr *ap; /* data and ack packets */
struct tftphdr *r_init(), *dp;
register int size, n;
u_short block = 0;
register unsigned long amount = 0;
struct sockaddr_in from;
int fromlen;
int convert; /* true if doing nl->crlf conversion */
FILE *file;
startclock(); /* start stat's clock */
dp = r_init(); /* reset fillbuf/read-ahead code */
ap = (struct tftphdr *)ackbuf;
file = fdopen(fd, "r");
convert = !strcmp(mode, "netascii");
signal(SIGALRM, timer);
do {
if (block == 0)
size = makerequest(WRQ, name, dp, mode) - 4;
else {
/* size = read(fd, dp->th_data, SEGSIZE); */
size = readit(file, &dp, convert);
if (size < 0) {
nak(errno + 100);
break;
}
dp->th_opcode = htons((u_short)DATA);
dp->th_block = htons(block);
}
timeout = 0;
(void) setjmp(timeoutbuf);
send_data:
if (trace)
tpacket("sent", dp, size + 4);
n = sendto(f, dp, size + 4, 0, (struct sockaddr *)&sin,
sizeof (sin));
if (n != size + 4) {
perror("tftp: sendto");
goto abort;
}
if (block) /* do not start reading until the blocksize
has been negotiated */
read_ahead(file, convert);
for ( ; ; ) {
alarm(rexmtval);
do {
fromlen = sizeof (from);
n = recvfrom(f, ackbuf, sizeof (ackbuf), 0,
(struct sockaddr *)&from,
&fromlen);
} while (n <= 0);
alarm(0);
if (n < 0) {
perror("tftp: recvfrom");
goto abort;
}
sin.sin_port = from.sin_port; /* added */
if (trace)
tpacket("received", ap, n);
/* should verify packet came from server */
ap->th_opcode = ntohs(ap->th_opcode);
if (ap->th_opcode == ERROR) {
printf("Error code %d: %s\n", ap->th_code,
ap->th_msg);
goto abort;
}
if (ap->th_opcode == ACK) {
int j;
ap->th_block = ntohs(ap->th_block);
if (block == 0) {
if (trace)
printf("server does not know "
"about RFC1782; reset"
"ting blocksize\n");
segsize = 512;
}
if (ap->th_block == block) {
break;
}
/* On an error, try to synchronize
* both sides.
*/
j = synchnet(f);
if (j && trace) {
printf("discarded %d packets\n",
j);
}
if (ap->th_block == (block-1)) {
goto send_data;
}
}
else if (ap->th_opcode == OACK) {
if (block) {
printf("protocol violation\n");
longjmp(toplevel, -1);
}
parseoack(&ap->th_stuff, n - 2);
break;
}
}
if (block > 0)
amount += size;
else
read_ahead(file, convert);
block++;
} while (size == segsize || block == 1);
abort:
fclose(file);
stopclock();
if (amount > 0)
printstats("Sent", amount);
}
/*
* Receive a file.
*/
recvfile(fd, name, mode)
int fd;
char *name;
char *mode;
{
register struct tftphdr *ap;
struct tftphdr *dp, *w_init();
register int n, size;
u_short block = 1;
unsigned long amount = 0;
struct sockaddr_in from;
int fromlen, firsttrip = 1;
FILE *file;
int convert; /* true if converting crlf -> lf */
int waitforoack = 1;
startclock();
dp = w_init();
ap = (struct tftphdr *)ackbuf;
file = fdopen(fd, "w");
convert = !strcmp(mode, "netascii");
signal(SIGALRM, timer);
do {
if (firsttrip) {
size = makerequest(RRQ, name, ap, mode);
firsttrip = 0;
} else {
ap->th_opcode = htons((u_short)ACK);
ap->th_block = htons(block);
size = 4;
block++;
}
timeout = 0;
(void) setjmp(timeoutbuf);
send_ack:
if (trace)
tpacket("sent", ap, size);
if (sendto(f, ackbuf, size, 0, (struct sockaddr *)&sin,
sizeof (sin)) != size) {
alarm(0);
perror("tftp: sendto");
goto abort;
}
if (!waitforoack)
write_behind(file, convert);
for ( ; ; ) {
alarm(rexmtval);
do {
fromlen = sizeof (from);
n = recvfrom(f, dp, PKTSIZE, 0,
(struct sockaddr *)&from, &fromlen);
} while (n <= 0);
alarm(0);
if (n < 0) {
perror("tftp: recvfrom");
goto abort;
}
sin.sin_port = from.sin_port; /* added */
if (trace)
tpacket("received", dp, n);
/* should verify client address */
dp->th_opcode = ntohs(dp->th_opcode);
if (dp->th_opcode == ERROR) {
printf("Error code %d: %s\n", dp->th_code,
dp->th_msg);
goto abort;
}
if (dp->th_opcode == DATA) {
int j;
if (waitforoack) {
if (trace)
printf("server does not know "
"about RFC1782; reset"
"ting blocksize\n");
waitforoack = 0;
segsize = 512;
}
dp->th_block = ntohs(dp->th_block);
if (dp->th_block == block) {
break; /* have next packet */
}
/* On an error, try to synchronize
* both sides.
*/
j = synchnet(f);
if (j && trace) {
printf("discarded %d packets\n", j);
}
if (dp->th_block == (block-1)) {
goto send_ack; /* resend ack */
}
}
else if (dp->th_opcode == OACK) {
if (block != 1 || !waitforoack) {
printf("protocol violation\n");
longjmp(toplevel, -1);
}
waitforoack = 0;
parseoack(&dp->th_stuff, n - 2);
ap->th_opcode = htons((u_short)ACK);
ap->th_block = htons(0);
size = 4;
goto send_ack;
}
}
/* size = write(fd, dp->th_data, n - 4); */
size = writeit(file, &dp, n - 4, convert);
if (size < 0) {
nak(errno + 100);
break;
}
amount += size;
} while (size == segsize);
abort: /* ok to ack, since user */
ap->th_opcode = htons((u_short)ACK); /* has seen err msg */
ap->th_block = htons(block);
(void) sendto(f, ackbuf, 4, 0, (struct sockaddr *)&sin, sizeof (sin));
write_behind(file, convert); /* flush last buffer */
fclose(file);
stopclock();
if (amount > 0)
printstats("Received", amount);
}
makerequest(request, name, tp, mode)
int request;
char *name, *mode;
struct tftphdr *tp;
{
register char *cp;
tp->th_opcode = htons((u_short)request);
cp = tp->th_stuff;
strcpy(cp, name);
cp += strlen(name);
*cp++ = '\0';
strcpy(cp, mode);
cp += strlen(mode);
*cp++ = '\0';
strcpy(cp, "blksize");
cp += 7;
*cp++ = '\0';
sprintf(cp, "%d", segsize);
cp += strlen(cp) + 1;
return (cp - (char *)tp);
}
struct errmsg {
int e_code;
const char *e_msg;
} errmsgs[] = {
{ EUNDEF, "Undefined error code" },
{ ENOTFOUND, "File not found" },
{ EACCESS, "Access violation" },
{ ENOSPACE, "Disk full or allocation exceeded" },
{ EBADOP, "Illegal TFTP operation" },
{ EBADID, "Unknown transfer ID" },
{ EEXISTS, "File already exists" },
{ ENOUSER, "No such user" },
{ -1, 0 }
};
/*
* Send a nak packet (error message).
* Error code passed in is one of the
* standard TFTP codes, or a UNIX errno
* offset by 100.
*/
nak(error)
int error;
{
register struct tftphdr *tp;
int length;
register struct errmsg *pe;
/* extern char *sys_errlist[]; */
tp = (struct tftphdr *)ackbuf;
tp->th_opcode = htons((u_short)ERROR);
tp->th_code = htons((u_short)error);
for (pe = errmsgs; pe->e_code >= 0; pe++)
if (pe->e_code == error)
break;
if (pe->e_code < 0) {
pe->e_msg = sys_errlist[error - 100];
tp->th_code = EUNDEF;
}
strcpy(tp->th_msg, pe->e_msg);
length = strlen(pe->e_msg) + 4;
if (trace)
tpacket("sent", tp, length);
if (sendto(f, ackbuf, length, 0, (struct sockaddr *)&sin, sizeof (sin))
!= length)
perror("nak");
}
topts(cp, sz)
char *cp;
int sz;
{
int n, i = 0;
while (sz > 0 && *cp) {
n = strnlen(cp, sz);
if (n > 0) {
printf("%s%s=", i++ ? ", " : "", cp);
cp += n + 1;
sz -= n + 1;
if (sz <= 0)
break;
n = strnlen(cp, sz);
if (n > 0)
printf("%s", cp);
}
cp += n + 1;
sz -= n + 1;
}
}
tpacket(s, tp, n)
char *s;
struct tftphdr *tp;
int n;
{
static char *opcodes[] =
{ "#0", "RRQ", "WRQ", "DATA", "ACK", "ERROR", "OACK" };
register char *cp, *file;
u_short op = ntohs(tp->th_opcode);
char *index();
if (op < RRQ || op > OACK)
printf("%s opcode=%x ", s, op);
else
printf("%s %s ", s, opcodes[op]);
switch (op) {
case RRQ:
case WRQ:
n -= 2;
file = cp = tp->th_stuff;
cp = index(cp, '\0');
printf("<file=%s, mode=%s, opts: ", file, cp + 1);
topts(index(cp + 1, '\000') + 1, n - strlen(file)
- strlen(cp + 1) - 2);
printf(">\n");
break;
case DATA:
printf("<block=%d, %d bytes>\n", ntohs(tp->th_block), n - 4);
break;
case ACK:
printf("<block=%d>\n", ntohs(tp->th_block));
break;
case ERROR:
printf("<code=%d, msg=%s>\n", ntohs(tp->th_code), tp->th_msg);
break;
case OACK:
printf("<");
topts(tp->th_stuff, n - 2);
printf(">\n");
break;
}
}
struct timeval tstart;
struct timeval tstop;
struct timezone zone;
startclock() {
gettimeofday(&tstart, &zone);
}
stopclock() {
gettimeofday(&tstop, &zone);
}
printstats(direction, amount)
char *direction;
unsigned long amount;
{
double delta;
/* compute delta in 1/10's second units */
delta = ((tstop.tv_sec*10.)+(tstop.tv_usec/100000)) -
((tstart.tv_sec*10.)+(tstart.tv_usec/100000));
delta = delta/10.; /* back to seconds */
printf("%s %ld bytes in %.1f seconds", direction, amount, delta);
if ((verbose) && (delta >= 0.1))
printf(" [%.0f bits/sec]", (amount*8.)/delta);
putchar('\n');
}