[apple/network_cmds.git] / tftp.tproj / tftp.c

/*
 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
 * Reserved.  This file contains Original Code and/or Modifications of
 * Original Code as defined in and that are subject to the Apple Public
 * Source License Version 1.0 (the 'License').  You may not use this file
 * except in compliance with the License.  Please obtain a copy of the
 * License at http://www.apple.com/publicsource and read it before using
 * this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License."
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */


/* 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 <errno.h>
#include <setjmp.h>
#include <signal.h>
#include <stdio.h>
#include <unistd.h>

#include "extern.h"
#include "tftpsubs.h"

extern	int errno;

extern  struct sockaddr_in peeraddr;	/* filled in by main */
extern  int     f;			/* the opened socket */
extern  int     trace;
extern  int     verbose;
extern  int     rexmtval;
extern  int     maxtimeout;

extern jmp_buf	toplevel;	/* filled in by main */

#define PKTSIZE    SEGSIZE+4
char    ackbuf[PKTSIZE];
int	timeout;
jmp_buf	timeoutbuf;

static void nak __P((int));
static int makerequest __P((int, const char *, struct tftphdr *, const char *));
static void printstats __P((const char *, unsigned long));
static void startclock __P((void));
static void stopclock __P((void));
static void timer __P((int));
static void tpacket __P((const char *, struct tftphdr *, int));

/*
 * Send the requested file.
 */
void
tftp_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 n;
	volatile int block, size, convert;
	volatile unsigned long amount;
	struct sockaddr_in from;
	int fromlen;
	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");
	block = 0;
	amount = 0;

	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((u_short)block);
		}
		timeout = 0;
		(void) setjmp(timeoutbuf);
send_data:
		if (trace)
			tpacket("sent", dp, size + 4);
		n = sendto(f, dp, size + 4, 0,
		    (struct sockaddr *)&peeraddr, sizeof(peeraddr));
		if (n != size + 4) {
			perror("tftp: sendto");
			goto abort;
		}
		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;
			}
			peeraddr.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);
			ap->th_block = ntohs(ap->th_block);
			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;

				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;
				}
			}
		}
		if (block > 0)
			amount += size;
		block++;
	} while (size == SEGSIZE || block == 1);
abort:
	fclose(file);
	stopclock();
	if (amount > 0)
		printstats("Sent", amount);
}

/*
 * Receive a file.
 */
void
recvfile(fd, name, mode)
	int fd;
	char *name;
	char *mode;
{
	register struct tftphdr *ap;
	struct tftphdr *dp, *w_init();
	register int n;
	volatile int block, size, firsttrip;
	volatile unsigned long amount;
	struct sockaddr_in from;
	int fromlen;
	FILE *file;
	volatile int convert;		/* true if converting crlf -> lf */

	startclock();
	dp = w_init();
	ap = (struct tftphdr *)ackbuf;
	file = fdopen(fd, "w");
	convert = !strcmp(mode, "netascii");
	block = 1;
	firsttrip = 1;
	amount = 0;

	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((u_short)(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 *)&peeraddr,
		    sizeof(peeraddr)) != size) {
			alarm(0);
			perror("tftp: sendto");
			goto abort;
		}
		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;
			}
			peeraddr.sin_port = from.sin_port;	/* added */
			if (trace)
				tpacket("received", dp, n);
			/* should verify client address */
			dp->th_opcode = ntohs(dp->th_opcode);
			dp->th_block = ntohs(dp->th_block);
			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 (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 */
				}
			}
		}
	/*	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((u_short)block);
	(void) sendto(f, ackbuf, 4, 0, (struct sockaddr *)&peeraddr,
	    sizeof(peeraddr));
	write_behind(file, convert);		/* flush last buffer */
	fclose(file);
	stopclock();
	if (amount > 0)
		printstats("Received", amount);
}

static int
makerequest(request, name, tp, mode)
	int request;
	const char *name;
	struct tftphdr *tp;
	const char *mode;
{
	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';
	return (cp - (char *)tp);
}

struct errmsg {
	int	e_code;
	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.
 */
static void
nak(error)
	int error;
{
	register struct errmsg *pe;
	register struct tftphdr *tp;
	int length;
	char *strerror();

	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 = strerror(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 *)&peeraddr,
	    sizeof(peeraddr)) != length)
		perror("nak");
}

static void
tpacket(s, tp, n)
	const char *s;
	struct tftphdr *tp;
	int n;
{
	static char *opcodes[] =
	   { "#0", "RRQ", "WRQ", "DATA", "ACK", "ERROR" };
	register char *cp, *file;
	u_short op = ntohs(tp->th_opcode);
	char *index();

	if (op < RRQ || op > ERROR)
		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>\n", file, cp + 1);
		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;
	}
}

struct timeval tstart;
struct timeval tstop;

static void
startclock()
{

	(void)gettimeofday(&tstart, NULL);
}

static void
stopclock()
{

	(void)gettimeofday(&tstop, NULL);
}

static void
printstats(direction, amount)
	const 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 %d bytes in %.1f seconds", direction, amount, delta);
	if (verbose)
		printf(" [%.0f bits/sec]", (amount*8.)/delta);
	putchar('\n');
}

static void
timer(sig)
	int sig;
{

	timeout += rexmtval;
	if (timeout >= maxtimeout) {
		printf("Transfer timed out.\n");
		longjmp(toplevel, -1);
	}
	longjmp(timeoutbuf, 1);
}
Commit	Line	Data
b7080c8e A	1	/*
	2	* Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
921c0aec A	6	* "Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
	7	* Reserved. This file contains Original Code and/or Modifications of
	8	* Original Code as defined in and that are subject to the Apple Public
	9	* Source License Version 1.0 (the 'License'). You may not use this file
	10	* except in compliance with the License. Please obtain a copy of the
	11	* License at http://www.apple.com/publicsource and read it before using
	12	* this file.
b7080c8e A	13	*
	14	* The Original Code and all software distributed under the License are
	15	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	16	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	17	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
921c0aec A	18	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	19	* License for the specific language governing rights and limitations
	20	* under the License."
b7080c8e A	21	*
	22	* @APPLE_LICENSE_HEADER_END@
	23	*/
	24	/*
	25	* Copyright (c) 1983, 1993
	26	* The Regents of the University of California. All rights reserved.
	27	*
	28	* Redistribution and use in source and binary forms, with or without
	29	* modification, are permitted provided that the following conditions
	30	* are met:
	31	* 1. Redistributions of source code must retain the above copyright
	32	* notice, this list of conditions and the following disclaimer.
	33	* 2. Redistributions in binary form must reproduce the above copyright
	34	* notice, this list of conditions and the following disclaimer in the
	35	* documentation and/or other materials provided with the distribution.
	36	* 3. All advertising materials mentioning features or use of this software
	37	* must display the following acknowledgement:
	38	* This product includes software developed by the University of
	39	* California, Berkeley and its contributors.
	40	* 4. Neither the name of the University nor the names of its contributors
	41	* may be used to endorse or promote products derived from this software
	42	* without specific prior written permission.
	43	*
	44	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	45	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	46	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	47	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	48	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	49	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	50	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	51	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	52	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	53	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	54	* SUCH DAMAGE.
	55	*/
	56
	57
	58	/* Many bug fixes are from Jim Guyton <guyton@rand-unix> */
	59
	60	/*
	61	* TFTP User Program -- Protocol Machines
	62	*/
	63	#include <sys/types.h>
	64	#include <sys/socket.h>
	65	#include <sys/time.h>
	66
	67	#include <netinet/in.h>
	68
	69	#include <arpa/tftp.h>
	70
	71	#include <errno.h>
	72	#include <setjmp.h>
	73	#include <signal.h>
	74	#include <stdio.h>
	75	#include <unistd.h>
	76
	77	#include "extern.h"
	78	#include "tftpsubs.h"
	79
	80	extern int errno;
	81
	82	extern struct sockaddr_in peeraddr; /* filled in by main */
	83	extern int f; /* the opened socket */
	84	extern int trace;
85	extern int verbose;
86	extern int rexmtval;
87	extern int maxtimeout;
88
89	extern jmp_buf toplevel; /* filled in by main */
90
91	#define PKTSIZE SEGSIZE+4
92	char ackbuf[PKTSIZE];
93	int timeout;
94	jmp_buf timeoutbuf;
95
96	static void nak __P((int));
97	static int makerequest __P((int, const char , struct tftphdr , const char *));
98	static void printstats __P((const char *, unsigned long));
99	static void startclock __P((void));
100	static void stopclock __P((void));
101	static void timer __P((int));
102	static void tpacket __P((const char , struct tftphdr , int));
103
104	/*
105	* Send the requested file.
106	*/
107	void
108	tftp_sendfile(fd, name, mode)
109	int fd;
110	char *name;
111	char *mode;
112	{
113	register struct tftphdr ap; / data and ack packets */
114	struct tftphdr r_init(), dp;
115	register int n;
116	volatile int block, size, convert;
117	volatile unsigned long amount;
118	struct sockaddr_in from;
119	int fromlen;
120	FILE *file;
121
122	startclock(); /* start stat's clock */
123	dp = r_init(); /* reset fillbuf/read-ahead code */
124	ap = (struct tftphdr *)ackbuf;
125	file = fdopen(fd, "r");
126	convert = !strcmp(mode, "netascii");
127	block = 0;
128	amount = 0;
129
130	signal(SIGALRM, timer);
131	do {
132	if (block == 0)
133	size = makerequest(WRQ, name, dp, mode) - 4;
134	else {
135	/* size = read(fd, dp->th_data, SEGSIZE); */
136	size = readit(file, &dp, convert);
137	if (size < 0) {
138	nak(errno + 100);
139	break;
140	}
141	dp->th_opcode = htons((u_short)DATA);
142	dp->th_block = htons((u_short)block);
143	}
144	timeout = 0;
145	(void) setjmp(timeoutbuf);
146	send_data:
147	if (trace)
148	tpacket("sent", dp, size + 4);
149	n = sendto(f, dp, size + 4, 0,
150	(struct sockaddr *)&peeraddr, sizeof(peeraddr));
151	if (n != size + 4) {
152	perror("tftp: sendto");
153	goto abort;
154	}
155	read_ahead(file, convert);
156	for ( ; ; ) {
157	alarm(rexmtval);
158	do {
159	fromlen = sizeof(from);
160	n = recvfrom(f, ackbuf, sizeof(ackbuf), 0,
161	(struct sockaddr *)&from, &fromlen);
162	} while (n <= 0);
163	alarm(0);
164	if (n < 0) {
165	perror("tftp: recvfrom");
166	goto abort;
167	}
168	peeraddr.sin_port = from.sin_port; /* added */
169	if (trace)
170	tpacket("received", ap, n);
171	/* should verify packet came from server */
172	ap->th_opcode = ntohs(ap->th_opcode);
173	ap->th_block = ntohs(ap->th_block);
174	if (ap->th_opcode == ERROR) {
175	printf("Error code %d: %s\n", ap->th_code,
176	ap->th_msg);
177	goto abort;
178	}
179	if (ap->th_opcode == ACK) {
180	int j;
181
182	if (ap->th_block == block) {
183	break;
184	}
185	/* On an error, try to synchronize
186	* both sides.
187	*/
188	j = synchnet(f);
189	if (j && trace) {
190	printf("discarded %d packets\n",
191	j);
192	}
193	if (ap->th_block == (block-1)) {
194	goto send_data;
195	}
196	}
197	}
198	if (block > 0)
199	amount += size;
200	block++;
201	} while (size == SEGSIZE \|\| block == 1);
202	abort:
203	fclose(file);
204	stopclock();
205	if (amount > 0)
206	printstats("Sent", amount);
207	}
208
209	/*
210	* Receive a file.
211	*/
212	void
213	recvfile(fd, name, mode)
214	int fd;
215	char *name;
216	char *mode;
217	{
218	register struct tftphdr *ap;
219	struct tftphdr dp, w_init();
220	register int n;
221	volatile int block, size, firsttrip;
222	volatile unsigned long amount;
223	struct sockaddr_in from;
224	int fromlen;
225	FILE *file;
226	volatile int convert; /* true if converting crlf -> lf */
227
228	startclock();
229	dp = w_init();
230	ap = (struct tftphdr *)ackbuf;
231	file = fdopen(fd, "w");
232	convert = !strcmp(mode, "netascii");
233	block = 1;
234	firsttrip = 1;
235	amount = 0;
236
237	signal(SIGALRM, timer);
238	do {
239	if (firsttrip) {
240	size = makerequest(RRQ, name, ap, mode);
241	firsttrip = 0;
242	} else {
243	ap->th_opcode = htons((u_short)ACK);
244	ap->th_block = htons((u_short)(block));
245	size = 4;
246	block++;
247	}
248	timeout = 0;
249	(void) setjmp(timeoutbuf);
250	send_ack:
251	if (trace)
252	tpacket("sent", ap, size);
253	if (sendto(f, ackbuf, size, 0, (struct sockaddr *)&peeraddr,
254	sizeof(peeraddr)) != size) {
255	alarm(0);
256	perror("tftp: sendto");
257	goto abort;
258	}
259	write_behind(file, convert);
260	for ( ; ; ) {
261	alarm(rexmtval);
262	do {
263	fromlen = sizeof(from);
264	n = recvfrom(f, dp, PKTSIZE, 0,
265	(struct sockaddr *)&from, &fromlen);
266	} while (n <= 0);
267	alarm(0);
268	if (n < 0) {
269	perror("tftp: recvfrom");
270	goto abort;
271	}
272	peeraddr.sin_port = from.sin_port; /* added */
273	if (trace)
274	tpacket("received", dp, n);
275	/* should verify client address */
276	dp->th_opcode = ntohs(dp->th_opcode);
277	dp->th_block = ntohs(dp->th_block);
278	if (dp->th_opcode == ERROR) {
279	printf("Error code %d: %s\n", dp->th_code,
280	dp->th_msg);
281	goto abort;
282	}
283	if (dp->th_opcode == DATA) {
284	int j;
285
286	if (dp->th_block == block) {
287	break; /* have next packet */
288	}
289	/* On an error, try to synchronize
290	* both sides.
291	*/
292	j = synchnet(f);
293	if (j && trace) {
294	printf("discarded %d packets\n", j);
295	}
296	if (dp->th_block == (block-1)) {
297	goto send_ack; /* resend ack */
298	}
299	}
300	}
301	/* size = write(fd, dp->th_data, n - 4); */
302	size = writeit(file, &dp, n - 4, convert);
303	if (size < 0) {
304	nak(errno + 100);
305	break;
306	}
307	amount += size;
308	} while (size == SEGSIZE);
309	abort: /* ok to ack, since user */
310	ap->th_opcode = htons((u_short)ACK); /* has seen err msg */
311	ap->th_block = htons((u_short)block);
312	(void) sendto(f, ackbuf, 4, 0, (struct sockaddr *)&peeraddr,
313	sizeof(peeraddr));
314	write_behind(file, convert); /* flush last buffer */
315	fclose(file);
316	stopclock();
317	if (amount > 0)
318	printstats("Received", amount);
319	}
320
321	static int
322	makerequest(request, name, tp, mode)
323	int request;
324	const char *name;
325	struct tftphdr *tp;
326	const char *mode;
327	{
328	register char *cp;
329
330	tp->th_opcode = htons((u_short)request);
331	cp = tp->th_stuff;
332	strcpy(cp, name);
333	cp += strlen(name);
334	*cp++ = '\0';
335	strcpy(cp, mode);
336	cp += strlen(mode);
337	*cp++ = '\0';
338	return (cp - (char *)tp);
339	}
340
341	struct errmsg {
342	int e_code;
343	char *e_msg;
344	} errmsgs[] = {
345	{ EUNDEF, "Undefined error code" },
346	{ ENOTFOUND, "File not found" },
347	{ EACCESS, "Access violation" },
348	{ ENOSPACE, "Disk full or allocation exceeded" },
349	{ EBADOP, "Illegal TFTP operation" },
350	{ EBADID, "Unknown transfer ID" },
351	{ EEXISTS, "File already exists" },
352	{ ENOUSER, "No such user" },
353	{ -1, 0 }
354	};
355
356	/*
357	* Send a nak packet (error message).
358	* Error code passed in is one of the
359	* standard TFTP codes, or a UNIX errno
360	* offset by 100.
361	*/
362	static void
363	nak(error)
364	int error;
365	{
366	register struct errmsg *pe;
367	register struct tftphdr *tp;
368	int length;
369	char *strerror();
370
371	tp = (struct tftphdr *)ackbuf;
372	tp->th_opcode = htons((u_short)ERROR);
373	tp->th_code = htons((u_short)error);
374	for (pe = errmsgs; pe->e_code >= 0; pe++)
375	if (pe->e_code == error)
376	break;
377	if (pe->e_code < 0) {
378	pe->e_msg = strerror(error - 100);
379	tp->th_code = EUNDEF;
380	}
381	strcpy(tp->th_msg, pe->e_msg);
382	length = strlen(pe->e_msg) + 4;
383	if (trace)
384	tpacket("sent", tp, length);
385	if (sendto(f, ackbuf, length, 0, (struct sockaddr *)&peeraddr,
386	sizeof(peeraddr)) != length)
387	perror("nak");
388	}
389
390	static void
391	tpacket(s, tp, n)
392	const char *s;
393	struct tftphdr *tp;
394	int n;
395	{
396	static char *opcodes[] =
397	{ "#0", "RRQ", "WRQ", "DATA", "ACK", "ERROR" };
398	register char cp, file;
399	u_short op = ntohs(tp->th_opcode);
400	char *index();
401
402	if (op < RRQ \|\| op > ERROR)
403	printf("%s opcode=%x ", s, op);
404	else
405	printf("%s %s ", s, opcodes[op]);
406	switch (op) {
407
408	case RRQ:
409	case WRQ:
410	n -= 2;
411	file = cp = tp->th_stuff;
412	cp = index(cp, '\0');
413	printf("<file=%s, mode=%s>\n", file, cp + 1);
414	break;
415
416	case DATA:
417	printf("<block=%d, %d bytes>\n", ntohs(tp->th_block), n - 4);
418	break;
419
420	case ACK:
421	printf("<block=%d>\n", ntohs(tp->th_block));
422	break;
423
424	case ERROR:
425	printf("<code=%d, msg=%s>\n", ntohs(tp->th_code), tp->th_msg);
426	break;
427	}
428	}
429
430	struct timeval tstart;
431	struct timeval tstop;
432
433	static void
434	startclock()
435	{
436
437	(void)gettimeofday(&tstart, NULL);
438	}
439
440	static void
441	stopclock()
442	{
443
444	(void)gettimeofday(&tstop, NULL);
445	}
446
447	static void
448	printstats(direction, amount)
449	const char *direction;
450	unsigned long amount;
451	{
452	double delta;
453	/* compute delta in 1/10's second units */
454	delta = ((tstop.tv_sec*10.)+(tstop.tv_usec/100000)) -
455	((tstart.tv_sec*10.)+(tstart.tv_usec/100000));
456	delta = delta/10.; /* back to seconds */
457	printf("%s %d bytes in %.1f seconds", direction, amount, delta);
458	if (verbose)
459	printf(" [%.0f bits/sec]", (amount*8.)/delta);
460	putchar('\n');
461	}
462
463	static void
464	timer(sig)
465	int sig;
466	{
467
468	timeout += rexmtval;
469	if (timeout >= maxtimeout) {
470	printf("Transfer timed out.\n");
471	longjmp(toplevel, -1);
472	}
473	longjmp(timeoutbuf, 1);
474	}