tftp.c (9b50d9027575220cb6dd09b3e62f03f511e908b8) tftp.c (fd129a0245ccdbed26aee4a48cd7d4b2fa74a99d)
1/*
2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
1/*
2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35#if 0
35static char sccsid[] = "@(#)tftp.c 8.1 (Berkeley) 6/6/93";
36static char sccsid[] = "@(#)tftp.c 8.1 (Berkeley) 6/6/93";
37#endif
38static const char rcsid[] =
39 "$Id$";
36#endif /* not lint */
37
38/* Many bug fixes are from Jim Guyton <guyton@rand-unix> */
39
40/*
41 * TFTP User Program -- Protocol Machines
42 */
43#include <sys/types.h>
44#include <sys/socket.h>
45#include <sys/time.h>
46
47#include <netinet/in.h>
48
49#include <arpa/tftp.h>
50
40#endif /* not lint */
41
42/* Many bug fixes are from Jim Guyton <guyton@rand-unix> */
43
44/*
45 * TFTP User Program -- Protocol Machines
46 */
47#include <sys/types.h>
48#include <sys/socket.h>
49#include <sys/time.h>
50
51#include <netinet/in.h>
52
53#include <arpa/tftp.h>
54
55#include <err.h>
51#include <errno.h>
52#include <setjmp.h>
53#include <signal.h>
54#include <stdio.h>
55#include <unistd.h>
56
57#include "extern.h"
58#include "tftpsubs.h"
59
56#include <errno.h>
57#include <setjmp.h>
58#include <signal.h>
59#include <stdio.h>
60#include <unistd.h>
61
62#include "extern.h"
63#include "tftpsubs.h"
64
60extern int errno;
61
62extern struct sockaddr_in peeraddr; /* filled in by main */
63extern int f; /* the opened socket */
64extern int trace;
65extern int verbose;
66extern int rexmtval;
67extern int maxtimeout;
68
69#define PKTSIZE SEGSIZE+4

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123 timeout = 0;
124 (void) setjmp(timeoutbuf);
125send_data:
126 if (trace)
127 tpacket("sent", dp, size + 4);
128 n = sendto(f, dp, size + 4, 0,
129 (struct sockaddr *)&peeraddr, sizeof(peeraddr));
130 if (n != size + 4) {
65extern struct sockaddr_in peeraddr; /* filled in by main */
66extern int f; /* the opened socket */
67extern int trace;
68extern int verbose;
69extern int rexmtval;
70extern int maxtimeout;
71
72#define PKTSIZE SEGSIZE+4

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126 timeout = 0;
127 (void) setjmp(timeoutbuf);
128send_data:
129 if (trace)
130 tpacket("sent", dp, size + 4);
131 n = sendto(f, dp, size + 4, 0,
132 (struct sockaddr *)&peeraddr, sizeof(peeraddr));
133 if (n != size + 4) {
131 perror("tftp: sendto");
134 warn("sendto");
132 goto abort;
133 }
134 read_ahead(file, convert);
135 for ( ; ; ) {
136 alarm(rexmtval);
137 do {
138 fromlen = sizeof(from);
139 n = recvfrom(f, ackbuf, sizeof(ackbuf), 0,
140 (struct sockaddr *)&from, &fromlen);
141 } while (n <= 0);
142 alarm(0);
143 if (n < 0) {
135 goto abort;
136 }
137 read_ahead(file, convert);
138 for ( ; ; ) {
139 alarm(rexmtval);
140 do {
141 fromlen = sizeof(from);
142 n = recvfrom(f, ackbuf, sizeof(ackbuf), 0,
143 (struct sockaddr *)&from, &fromlen);
144 } while (n <= 0);
145 alarm(0);
146 if (n < 0) {
144 perror("tftp: recvfrom");
147 warn("recvfrom");
145 goto abort;
146 }
147 peeraddr.sin_port = from.sin_port; /* added */
148 if (trace)
149 tpacket("received", ap, n);
150 /* should verify packet came from server */
151 ap->th_opcode = ntohs(ap->th_opcode);
152 ap->th_block = ntohs(ap->th_block);

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227 timeout = 0;
228 (void) setjmp(timeoutbuf);
229send_ack:
230 if (trace)
231 tpacket("sent", ap, size);
232 if (sendto(f, ackbuf, size, 0, (struct sockaddr *)&peeraddr,
233 sizeof(peeraddr)) != size) {
234 alarm(0);
148 goto abort;
149 }
150 peeraddr.sin_port = from.sin_port; /* added */
151 if (trace)
152 tpacket("received", ap, n);
153 /* should verify packet came from server */
154 ap->th_opcode = ntohs(ap->th_opcode);
155 ap->th_block = ntohs(ap->th_block);

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230 timeout = 0;
231 (void) setjmp(timeoutbuf);
232send_ack:
233 if (trace)
234 tpacket("sent", ap, size);
235 if (sendto(f, ackbuf, size, 0, (struct sockaddr *)&peeraddr,
236 sizeof(peeraddr)) != size) {
237 alarm(0);
235 perror("tftp: sendto");
238 warn("sendto");
236 goto abort;
237 }
238 write_behind(file, convert);
239 for ( ; ; ) {
240 alarm(rexmtval);
241 do {
242 fromlen = sizeof(from);
243 n = recvfrom(f, dp, PKTSIZE, 0,
244 (struct sockaddr *)&from, &fromlen);
245 } while (n <= 0);
246 alarm(0);
247 if (n < 0) {
239 goto abort;
240 }
241 write_behind(file, convert);
242 for ( ; ; ) {
243 alarm(rexmtval);
244 do {
245 fromlen = sizeof(from);
246 n = recvfrom(f, dp, PKTSIZE, 0,
247 (struct sockaddr *)&from, &fromlen);
248 } while (n <= 0);
249 alarm(0);
250 if (n < 0) {
248 perror("tftp: recvfrom");
251 warn("recvfrom");
249 goto abort;
250 }
251 peeraddr.sin_port = from.sin_port; /* added */
252 if (trace)
253 tpacket("received", dp, n);
254 /* should verify client address */
255 dp->th_opcode = ntohs(dp->th_opcode);
256 dp->th_block = ntohs(dp->th_block);

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358 tp->th_code = EUNDEF;
359 }
360 strcpy(tp->th_msg, pe->e_msg);
361 length = strlen(pe->e_msg) + 4;
362 if (trace)
363 tpacket("sent", tp, length);
364 if (sendto(f, ackbuf, length, 0, (struct sockaddr *)&peeraddr,
365 sizeof(peeraddr)) != length)
252 goto abort;
253 }
254 peeraddr.sin_port = from.sin_port; /* added */
255 if (trace)
256 tpacket("received", dp, n);
257 /* should verify client address */
258 dp->th_opcode = ntohs(dp->th_opcode);
259 dp->th_block = ntohs(dp->th_block);

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361 tp->th_code = EUNDEF;
362 }
363 strcpy(tp->th_msg, pe->e_msg);
364 length = strlen(pe->e_msg) + 4;
365 if (trace)
366 tpacket("sent", tp, length);
367 if (sendto(f, ackbuf, length, 0, (struct sockaddr *)&peeraddr,
368 sizeof(peeraddr)) != length)
366 perror("nak");
369 warn("nak");
367}
368
369static void
370tpacket(s, tp, n)
371 const char *s;
372 struct tftphdr *tp;
373 int n;
374{

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371
372static void
373tpacket(s, tp, n)
374 const char *s;
375 struct tftphdr *tp;
376 int n;
377{

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