xref: /csrg-svn/usr.bin/ftp/ftp.c (revision 66672) 
1 /*
2  * Copyright (c) 1985, 1989, 1993, 1994
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * %sccs.include.redist.c%
6  */
7 
8 #ifndef lint
9 static char sccsid[] = "@(#)ftp.c	8.3 (Berkeley) 04/02/94";
10 #endif /* not lint */
11 
12 #include <sys/param.h>
13 #include <sys/stat.h>
14 #include <sys/ioctl.h>
15 #include <sys/socket.h>
16 #include <sys/time.h>
17 #include <sys/file.h>
18 
19 #include <netinet/in.h>
20 #include <netinet/in_systm.h>
21 #include <netinet/ip.h>
22 #include <arpa/inet.h>
23 #include <arpa/ftp.h>
24 #include <arpa/telnet.h>
25 
26 #include <ctype.h>
27 #include <err.h>
28 #include <errno.h>
29 #include <fcntl.h>
30 #include <netdb.h>
31 #include <pwd.h>
32 #include <signal.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36 #include <unistd.h>
37 #include <varargs.h>
38 
39 #include "ftp_var.h"
40 
41 extern int h_errno;
42 
43 struct	sockaddr_in hisctladdr;
44 struct	sockaddr_in data_addr;
45 int	data = -1;
46 int	abrtflag = 0;
47 jmp_buf	ptabort;
48 int	ptabflg;
49 int	ptflag = 0;
50 struct	sockaddr_in myctladdr;
51 off_t	restart_point = 0;
52 
53 
54 FILE	*cin, *cout;
55 
56 char *
57 hookup(host, port)
58 	char *host;
59 	int port;
60 {
61 	struct hostent *hp = 0;
62 	int s, len, tos;
63 	static char hostnamebuf[80];
64 
65 	memset((char *)&hisctladdr, 0, sizeof (hisctladdr));
66 	hisctladdr.sin_addr.s_addr = inet_addr(host);
67 	if (hisctladdr.sin_addr.s_addr != -1) {
68 		hisctladdr.sin_family = AF_INET;
69 		(void) strncpy(hostnamebuf, host, sizeof(hostnamebuf));
70 	} else {
71 		hp = gethostbyname(host);
72 		if (hp == NULL) {
73 			warnx("%s: %s", host, hstrerror(h_errno));
74 			code = -1;
75 			return ((char *) 0);
76 		}
77 		hisctladdr.sin_family = hp->h_addrtype;
78 		memmove((caddr_t)&hisctladdr.sin_addr,
79 				hp->h_addr_list[0], hp->h_length);
80 		(void) strncpy(hostnamebuf, hp->h_name, sizeof(hostnamebuf));
81 	}
82 	hostname = hostnamebuf;
83 	s = socket(hisctladdr.sin_family, SOCK_STREAM, 0);
84 	if (s < 0) {
85 		warn("socket");
86 		code = -1;
87 		return (0);
88 	}
89 	hisctladdr.sin_port = port;
90 	while (connect(s, (struct sockaddr *)&hisctladdr, sizeof (hisctladdr)) < 0) {
91 		if (hp && hp->h_addr_list[1]) {
92 			int oerrno = errno;
93 			char *ia;
94 
95 			ia = inet_ntoa(hisctladdr.sin_addr);
96 			errno = oerrno;
97 			warn("connect to address %s", ia);
98 			hp->h_addr_list++;
99 			memmove((caddr_t)&hisctladdr.sin_addr,
100 					hp->h_addr_list[0], hp->h_length);
101 			fprintf(stdout, "Trying %s...\n",
102 				inet_ntoa(hisctladdr.sin_addr));
103 			(void) close(s);
104 			s = socket(hisctladdr.sin_family, SOCK_STREAM, 0);
105 			if (s < 0) {
106 				warn("socket");
107 				code = -1;
108 				return (0);
109 			}
110 			continue;
111 		}
112 		warn("connect");
113 		code = -1;
114 		goto bad;
115 	}
116 	len = sizeof (myctladdr);
117 	if (getsockname(s, (struct sockaddr *)&myctladdr, &len) < 0) {
118 		warn("getsockname");
119 		code = -1;
120 		goto bad;
121 	}
122 #ifdef IP_TOS
123 	tos = IPTOS_LOWDELAY;
124 	if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0)
125 		warn("setsockopt TOS (ignored)");
126 #endif
127 	cin = fdopen(s, "r");
128 	cout = fdopen(s, "w");
129 	if (cin == NULL || cout == NULL) {
130 		warnx("fdopen failed.");
131 		if (cin)
132 			(void) fclose(cin);
133 		if (cout)
134 			(void) fclose(cout);
135 		code = -1;
136 		goto bad;
137 	}
138 	if (verbose)
139 		printf("Connected to %s.\n", hostname);
140 	if (getreply(0) > 2) { 	/* read startup message from server */
141 		if (cin)
142 			(void) fclose(cin);
143 		if (cout)
144 			(void) fclose(cout);
145 		code = -1;
146 		goto bad;
147 	}
148 #ifdef SO_OOBINLINE
149 	{
150 	int on = 1;
151 
152 	if (setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on))
153 		< 0 && debug) {
154 			warn("setsockopt");
155 		}
156 	}
157 #endif /* SO_OOBINLINE */
158 
159 	return (hostname);
160 bad:
161 	(void) close(s);
162 	return ((char *)0);
163 }
164 
165 int
166 login(host)
167 	char *host;
168 {
169 	char tmp[80];
170 	char *user, *pass, *acct;
171 	int n, aflag = 0;
172 
173 	user = pass = acct = 0;
174 	if (ruserpass(host, &user, &pass, &acct) < 0) {
175 		code = -1;
176 		return (0);
177 	}
178 	while (user == NULL) {
179 		char *myname = getlogin();
180 
181 		if (myname == NULL) {
182 			struct passwd *pp = getpwuid(getuid());
183 
184 			if (pp != NULL)
185 				myname = pp->pw_name;
186 		}
187 		if (myname)
188 			printf("Name (%s:%s): ", host, myname);
189 		else
190 			printf("Name (%s): ", host);
191 		(void) fgets(tmp, sizeof(tmp) - 1, stdin);
192 		tmp[strlen(tmp) - 1] = '\0';
193 		if (*tmp == '\0')
194 			user = myname;
195 		else
196 			user = tmp;
197 	}
198 	n = command("USER %s", user);
199 	if (n == CONTINUE) {
200 		if (pass == NULL)
201 			pass = getpass("Password:");
202 		n = command("PASS %s", pass);
203 	}
204 	if (n == CONTINUE) {
205 		aflag++;
206 		acct = getpass("Account:");
207 		n = command("ACCT %s", acct);
208 	}
209 	if (n != COMPLETE) {
210 		warnx("Login failed.");
211 		return (0);
212 	}
213 	if (!aflag && acct != NULL)
214 		(void) command("ACCT %s", acct);
215 	if (proxy)
216 		return (1);
217 	for (n = 0; n < macnum; ++n) {
218 		if (!strcmp("init", macros[n].mac_name)) {
219 			(void) strcpy(line, "$init");
220 			makeargv();
221 			domacro(margc, margv);
222 			break;
223 		}
224 	}
225 	return (1);
226 }
227 
228 void
229 cmdabort()
230 {
231 
232 	printf("\n");
233 	(void) fflush(stdout);
234 	abrtflag++;
235 	if (ptflag)
236 		longjmp(ptabort,1);
237 }
238 
239 /*VARARGS*/
240 int
241 command(va_alist)
242 va_dcl
243 {
244 	va_list ap;
245 	char *fmt;
246 	int r;
247 	sig_t oldintr;
248 
249 	abrtflag = 0;
250 	if (debug) {
251 		printf("---> ");
252 		va_start(ap);
253 		fmt = va_arg(ap, char *);
254 		if (strncmp("PASS ", fmt, 5) == 0)
255 			printf("PASS XXXX");
256 		else
257 			vfprintf(stdout, fmt, ap);
258 		va_end(ap);
259 		printf("\n");
260 		(void) fflush(stdout);
261 	}
262 	if (cout == NULL) {
263 		warn("No control connection for command");
264 		code = -1;
265 		return (0);
266 	}
267 	oldintr = signal(SIGINT, cmdabort);
268 	va_start(ap);
269 	fmt = va_arg(ap, char *);
270 	vfprintf(cout, fmt, ap);
271 	va_end(ap);
272 	fprintf(cout, "\r\n");
273 	(void) fflush(cout);
274 	cpend = 1;
275 	r = getreply(!strcmp(fmt, "QUIT"));
276 	if (abrtflag && oldintr != SIG_IGN)
277 		(*oldintr)(SIGINT);
278 	(void) signal(SIGINT, oldintr);
279 	return (r);
280 }
281 
282 char reply_string[BUFSIZ];		/* last line of previous reply */
283 
284 int
285 getreply(expecteof)
286 	int expecteof;
287 {
288 	int c, n;
289 	int dig;
290 	int originalcode = 0, continuation = 0;
291 	sig_t oldintr;
292 	int pflag = 0;
293 	char *cp, *pt = pasv;
294 
295 	oldintr = signal(SIGINT, cmdabort);
296 	for (;;) {
297 		dig = n = code = 0;
298 		cp = reply_string;
299 		while ((c = getc(cin)) != '\n') {
300 			if (c == IAC) {     /* handle telnet commands */
301 				switch (c = getc(cin)) {
302 				case WILL:
303 				case WONT:
304 					c = getc(cin);
305 					fprintf(cout, "%c%c%c", IAC, DONT, c);
306 					(void) fflush(cout);
307 					break;
308 				case DO:
309 				case DONT:
310 					c = getc(cin);
311 					fprintf(cout, "%c%c%c", IAC, WONT, c);
312 					(void) fflush(cout);
313 					break;
314 				default:
315 					break;
316 				}
317 				continue;
318 			}
319 			dig++;
320 			if (c == EOF) {
321 				if (expecteof) {
322 					(void) signal(SIGINT,oldintr);
323 					code = 221;
324 					return (0);
325 				}
326 				lostpeer();
327 				if (verbose) {
328 					printf("421 Service not available, remote server has closed connection\n");
329 					(void) fflush(stdout);
330 				}
331 				code = 421;
332 				return (4);
333 			}
334 			if (c != '\r' && (verbose > 0 ||
335 			    (verbose > -1 && n == '5' && dig > 4))) {
336 				if (proxflag &&
337 				   (dig == 1 || dig == 5 && verbose == 0))
338 					printf("%s:",hostname);
339 				(void) putchar(c);
340 			}
341 			if (dig < 4 && isdigit(c))
342 				code = code * 10 + (c - '0');
343 			if (!pflag && code == 227)
344 				pflag = 1;
345 			if (dig > 4 && pflag == 1 && isdigit(c))
346 				pflag = 2;
347 			if (pflag == 2) {
348 				if (c != '\r' && c != ')')
349 					*pt++ = c;
350 				else {
351 					*pt = '\0';
352 					pflag = 3;
353 				}
354 			}
355 			if (dig == 4 && c == '-') {
356 				if (continuation)
357 					code = 0;
358 				continuation++;
359 			}
360 			if (n == 0)
361 				n = c;
362 			if (cp < &reply_string[sizeof(reply_string) - 1])
363 				*cp++ = c;
364 		}
365 		if (verbose > 0 || verbose > -1 && n == '5') {
366 			(void) putchar(c);
367 			(void) fflush (stdout);
368 		}
369 		if (continuation && code != originalcode) {
370 			if (originalcode == 0)
371 				originalcode = code;
372 			continue;
373 		}
374 		*cp = '\0';
375 		if (n != '1')
376 			cpend = 0;
377 		(void) signal(SIGINT,oldintr);
378 		if (code == 421 || originalcode == 421)
379 			lostpeer();
380 		if (abrtflag && oldintr != cmdabort && oldintr != SIG_IGN)
381 			(*oldintr)(SIGINT);
382 		return (n - '0');
383 	}
384 }
385 
386 int
387 empty(mask, sec)
388 	struct fd_set *mask;
389 	int sec;
390 {
391 	struct timeval t;
392 
393 	t.tv_sec = (long) sec;
394 	t.tv_usec = 0;
395 	return (select(32, mask, (struct fd_set *) 0, (struct fd_set *) 0, &t));
396 }
397 
398 jmp_buf	sendabort;
399 
400 void
401 abortsend()
402 {
403 
404 	mflag = 0;
405 	abrtflag = 0;
406 	printf("\nsend aborted\nwaiting for remote to finish abort\n");
407 	(void) fflush(stdout);
408 	longjmp(sendabort, 1);
409 }
410 
411 #define HASHBYTES 1024
412 
413 void
414 sendrequest(cmd, local, remote, printnames)
415 	char *cmd, *local, *remote;
416 	int printnames;
417 {
418 	struct stat st;
419 	struct timeval start, stop;
420 	int c, d;
421 	FILE *fin, *dout = 0, *popen();
422 	int (*closefunc) __P((FILE *));
423 	sig_t oldintr, oldintp;
424 	long bytes = 0, hashbytes = HASHBYTES;
425 	char *lmode, buf[BUFSIZ], *bufp;
426 
427 	if (verbose && printnames) {
428 		if (local && *local != '-')
429 			printf("local: %s ", local);
430 		if (remote)
431 			printf("remote: %s\n", remote);
432 	}
433 	if (proxy) {
434 		proxtrans(cmd, local, remote);
435 		return;
436 	}
437 	if (curtype != type)
438 		changetype(type, 0);
439 	closefunc = NULL;
440 	oldintr = NULL;
441 	oldintp = NULL;
442 	lmode = "w";
443 	if (setjmp(sendabort)) {
444 		while (cpend) {
445 			(void) getreply(0);
446 		}
447 		if (data >= 0) {
448 			(void) close(data);
449 			data = -1;
450 		}
451 		if (oldintr)
452 			(void) signal(SIGINT,oldintr);
453 		if (oldintp)
454 			(void) signal(SIGPIPE,oldintp);
455 		code = -1;
456 		return;
457 	}
458 	oldintr = signal(SIGINT, abortsend);
459 	if (strcmp(local, "-") == 0)
460 		fin = stdin;
461 	else if (*local == '|') {
462 		oldintp = signal(SIGPIPE,SIG_IGN);
463 		fin = popen(local + 1, "r");
464 		if (fin == NULL) {
465 			warn("%s", local + 1);
466 			(void) signal(SIGINT, oldintr);
467 			(void) signal(SIGPIPE, oldintp);
468 			code = -1;
469 			return;
470 		}
471 		closefunc = pclose;
472 	} else {
473 		fin = fopen(local, "r");
474 		if (fin == NULL) {
475 			warn("local: %s", local);
476 			(void) signal(SIGINT, oldintr);
477 			code = -1;
478 			return;
479 		}
480 		closefunc = fclose;
481 		if (fstat(fileno(fin), &st) < 0 ||
482 		    (st.st_mode&S_IFMT) != S_IFREG) {
483 			fprintf(stdout, "%s: not a plain file.\n", local);
484 			(void) signal(SIGINT, oldintr);
485 			fclose(fin);
486 			code = -1;
487 			return;
488 		}
489 	}
490 	if (initconn()) {
491 		(void) signal(SIGINT, oldintr);
492 		if (oldintp)
493 			(void) signal(SIGPIPE, oldintp);
494 		code = -1;
495 		if (closefunc != NULL)
496 			(*closefunc)(fin);
497 		return;
498 	}
499 	if (setjmp(sendabort))
500 		goto abort;
501 
502 	if (restart_point &&
503 	    (strcmp(cmd, "STOR") == 0 || strcmp(cmd, "APPE") == 0)) {
504 		if (fseek(fin, (long) restart_point, 0) < 0) {
505 			warn("local: %s", local);
506 			restart_point = 0;
507 			if (closefunc != NULL)
508 				(*closefunc)(fin);
509 			return;
510 		}
511 		if (command("REST %ld", (long) restart_point)
512 			!= CONTINUE) {
513 			restart_point = 0;
514 			if (closefunc != NULL)
515 				(*closefunc)(fin);
516 			return;
517 		}
518 		restart_point = 0;
519 		lmode = "r+w";
520 	}
521 	if (remote) {
522 		if (command("%s %s", cmd, remote) != PRELIM) {
523 			(void) signal(SIGINT, oldintr);
524 			if (oldintp)
525 				(void) signal(SIGPIPE, oldintp);
526 			if (closefunc != NULL)
527 				(*closefunc)(fin);
528 			return;
529 		}
530 	} else
531 		if (command("%s", cmd) != PRELIM) {
532 			(void) signal(SIGINT, oldintr);
533 			if (oldintp)
534 				(void) signal(SIGPIPE, oldintp);
535 			if (closefunc != NULL)
536 				(*closefunc)(fin);
537 			return;
538 		}
539 	dout = dataconn(lmode);
540 	if (dout == NULL)
541 		goto abort;
542 	(void) gettimeofday(&start, (struct timezone *)0);
543 	oldintp = signal(SIGPIPE, SIG_IGN);
544 	switch (curtype) {
545 
546 	case TYPE_I:
547 	case TYPE_L:
548 		errno = d = 0;
549 		while ((c = read(fileno(fin), buf, sizeof (buf))) > 0) {
550 			bytes += c;
551 			for (bufp = buf; c > 0; c -= d, bufp += d)
552 				if ((d = write(fileno(dout), bufp, c)) <= 0)
553 					break;
554 			if (hash) {
555 				while (bytes >= hashbytes) {
556 					(void) putchar('#');
557 					hashbytes += HASHBYTES;
558 				}
559 				(void) fflush(stdout);
560 			}
561 		}
562 		if (hash && bytes > 0) {
563 			if (bytes < HASHBYTES)
564 				(void) putchar('#');
565 			(void) putchar('\n');
566 			(void) fflush(stdout);
567 		}
568 		if (c < 0)
569 			warn("local: %s", local);
570 		if (d < 0) {
571 			if (errno != EPIPE)
572 				warn("netout");
573 			bytes = -1;
574 		}
575 		break;
576 
577 	case TYPE_A:
578 		while ((c = getc(fin)) != EOF) {
579 			if (c == '\n') {
580 				while (hash && (bytes >= hashbytes)) {
581 					(void) putchar('#');
582 					(void) fflush(stdout);
583 					hashbytes += HASHBYTES;
584 				}
585 				if (ferror(dout))
586 					break;
587 				(void) putc('\r', dout);
588 				bytes++;
589 			}
590 			(void) putc(c, dout);
591 			bytes++;
592 	/*		if (c == '\r') {			  	*/
593 	/*		(void)	putc('\0', dout);  // this violates rfc */
594 	/*			bytes++;				*/
595 	/*		}                          			*/
596 		}
597 		if (hash) {
598 			if (bytes < hashbytes)
599 				(void) putchar('#');
600 			(void) putchar('\n');
601 			(void) fflush(stdout);
602 		}
603 		if (ferror(fin))
604 			warn("local: %s", local);
605 		if (ferror(dout)) {
606 			if (errno != EPIPE)
607 				warn("netout");
608 			bytes = -1;
609 		}
610 		break;
611 	}
612 	(void) gettimeofday(&stop, (struct timezone *)0);
613 	if (closefunc != NULL)
614 		(*closefunc)(fin);
615 	(void) fclose(dout);
616 	(void) getreply(0);
617 	(void) signal(SIGINT, oldintr);
618 	if (oldintp)
619 		(void) signal(SIGPIPE, oldintp);
620 	if (bytes > 0)
621 		ptransfer("sent", bytes, &start, &stop);
622 	return;
623 abort:
624 	(void) gettimeofday(&stop, (struct timezone *)0);
625 	(void) signal(SIGINT, oldintr);
626 	if (oldintp)
627 		(void) signal(SIGPIPE, oldintp);
628 	if (!cpend) {
629 		code = -1;
630 		return;
631 	}
632 	if (data >= 0) {
633 		(void) close(data);
634 		data = -1;
635 	}
636 	if (dout)
637 		(void) fclose(dout);
638 	(void) getreply(0);
639 	code = -1;
640 	if (closefunc != NULL && fin != NULL)
641 		(*closefunc)(fin);
642 	if (bytes > 0)
643 		ptransfer("sent", bytes, &start, &stop);
644 }
645 
646 jmp_buf	recvabort;
647 
648 void
649 abortrecv()
650 {
651 
652 	mflag = 0;
653 	abrtflag = 0;
654 	printf("\nreceive aborted\nwaiting for remote to finish abort\n");
655 	(void) fflush(stdout);
656 	longjmp(recvabort, 1);
657 }
658 
659 void
660 recvrequest(cmd, local, remote, lmode, printnames)
661 	char *cmd, *local, *remote, *lmode;
662 	int printnames;
663 {
664 	FILE *fout, *din = 0;
665 	int (*closefunc) __P((FILE *));
666 	sig_t oldintr, oldintp;
667 	int c, d, is_retr, tcrflag, bare_lfs = 0;
668 	static int bufsize;
669 	static char *buf;
670 	long bytes = 0, hashbytes = HASHBYTES;
671 	struct timeval start, stop;
672 	struct stat st;
673 
674 	is_retr = strcmp(cmd, "RETR") == 0;
675 	if (is_retr && verbose && printnames) {
676 		if (local && *local != '-')
677 			printf("local: %s ", local);
678 		if (remote)
679 			printf("remote: %s\n", remote);
680 	}
681 	if (proxy && is_retr) {
682 		proxtrans(cmd, local, remote);
683 		return;
684 	}
685 	closefunc = NULL;
686 	oldintr = NULL;
687 	oldintp = NULL;
688 	tcrflag = !crflag && is_retr;
689 	if (setjmp(recvabort)) {
690 		while (cpend) {
691 			(void) getreply(0);
692 		}
693 		if (data >= 0) {
694 			(void) close(data);
695 			data = -1;
696 		}
697 		if (oldintr)
698 			(void) signal(SIGINT, oldintr);
699 		code = -1;
700 		return;
701 	}
702 	oldintr = signal(SIGINT, abortrecv);
703 	if (strcmp(local, "-") && *local != '|') {
704 		if (access(local, 2) < 0) {
705 			char *dir = strrchr(local, '/');
706 
707 			if (errno != ENOENT && errno != EACCES) {
708 				warn("local: %s", local);
709 				(void) signal(SIGINT, oldintr);
710 				code = -1;
711 				return;
712 			}
713 			if (dir != NULL)
714 				*dir = 0;
715 			d = access(dir ? local : ".", 2);
716 			if (dir != NULL)
717 				*dir = '/';
718 			if (d < 0) {
719 				warn("local: %s", local);
720 				(void) signal(SIGINT, oldintr);
721 				code = -1;
722 				return;
723 			}
724 			if (!runique && errno == EACCES &&
725 			    chmod(local, 0600) < 0) {
726 				warn("local: %s", local);
727 				(void) signal(SIGINT, oldintr);
728 				(void) signal(SIGINT, oldintr);
729 				code = -1;
730 				return;
731 			}
732 			if (runique && errno == EACCES &&
733 			   (local = gunique(local)) == NULL) {
734 				(void) signal(SIGINT, oldintr);
735 				code = -1;
736 				return;
737 			}
738 		}
739 		else if (runique && (local = gunique(local)) == NULL) {
740 			(void) signal(SIGINT, oldintr);
741 			code = -1;
742 			return;
743 		}
744 	}
745 	if (!is_retr) {
746 		if (curtype != TYPE_A)
747 			changetype(TYPE_A, 0);
748 	} else if (curtype != type)
749 		changetype(type, 0);
750 	if (initconn()) {
751 		(void) signal(SIGINT, oldintr);
752 		code = -1;
753 		return;
754 	}
755 	if (setjmp(recvabort))
756 		goto abort;
757 	if (is_retr && restart_point &&
758 	    command("REST %ld", (long) restart_point) != CONTINUE)
759 		return;
760 	if (remote) {
761 		if (command("%s %s", cmd, remote) != PRELIM) {
762 			(void) signal(SIGINT, oldintr);
763 			return;
764 		}
765 	} else {
766 		if (command("%s", cmd) != PRELIM) {
767 			(void) signal(SIGINT, oldintr);
768 			return;
769 		}
770 	}
771 	din = dataconn("r");
772 	if (din == NULL)
773 		goto abort;
774 	if (strcmp(local, "-") == 0)
775 		fout = stdout;
776 	else if (*local == '|') {
777 		oldintp = signal(SIGPIPE, SIG_IGN);
778 		fout = popen(local + 1, "w");
779 		if (fout == NULL) {
780 			warn("%s", local+1);
781 			goto abort;
782 		}
783 		closefunc = pclose;
784 	} else {
785 		fout = fopen(local, lmode);
786 		if (fout == NULL) {
787 			warn("local: %s", local);
788 			goto abort;
789 		}
790 		closefunc = fclose;
791 	}
792 	if (fstat(fileno(fout), &st) < 0 || st.st_blksize == 0)
793 		st.st_blksize = BUFSIZ;
794 	if (st.st_blksize > bufsize) {
795 		if (buf)
796 			(void) free(buf);
797 		buf = malloc((unsigned)st.st_blksize);
798 		if (buf == NULL) {
799 			warn("malloc");
800 			bufsize = 0;
801 			goto abort;
802 		}
803 		bufsize = st.st_blksize;
804 	}
805 	(void) gettimeofday(&start, (struct timezone *)0);
806 	switch (curtype) {
807 
808 	case TYPE_I:
809 	case TYPE_L:
810 		if (restart_point &&
811 		    lseek(fileno(fout), restart_point, L_SET) < 0) {
812 			warn("local: %s", local);
813 			if (closefunc != NULL)
814 				(*closefunc)(fout);
815 			return;
816 		}
817 		errno = d = 0;
818 		while ((c = read(fileno(din), buf, bufsize)) > 0) {
819 			if ((d = write(fileno(fout), buf, c)) != c)
820 				break;
821 			bytes += c;
822 			if (hash) {
823 				while (bytes >= hashbytes) {
824 					(void) putchar('#');
825 					hashbytes += HASHBYTES;
826 				}
827 				(void) fflush(stdout);
828 			}
829 		}
830 		if (hash && bytes > 0) {
831 			if (bytes < HASHBYTES)
832 				(void) putchar('#');
833 			(void) putchar('\n');
834 			(void) fflush(stdout);
835 		}
836 		if (c < 0) {
837 			if (errno != EPIPE)
838 				warn("netin");
839 			bytes = -1;
840 		}
841 		if (d < c) {
842 			if (d < 0)
843 				warn("local: %s", local);
844 			else
845 				warnx("%s: short write", local);
846 		}
847 		break;
848 
849 	case TYPE_A:
850 		if (restart_point) {
851 			int i, n, ch;
852 
853 			if (fseek(fout, 0L, L_SET) < 0)
854 				goto done;
855 			n = restart_point;
856 			for (i = 0; i++ < n;) {
857 				if ((ch = getc(fout)) == EOF)
858 					goto done;
859 				if (ch == '\n')
860 					i++;
861 			}
862 			if (fseek(fout, 0L, L_INCR) < 0) {
863 done:
864 				warn("local: %s", local);
865 				if (closefunc != NULL)
866 					(*closefunc)(fout);
867 				return;
868 			}
869 		}
870 		while ((c = getc(din)) != EOF) {
871 			if (c == '\n')
872 				bare_lfs++;
873 			while (c == '\r') {
874 				while (hash && (bytes >= hashbytes)) {
875 					(void) putchar('#');
876 					(void) fflush(stdout);
877 					hashbytes += HASHBYTES;
878 				}
879 				bytes++;
880 				if ((c = getc(din)) != '\n' || tcrflag) {
881 					if (ferror(fout))
882 						goto break2;
883 					(void) putc('\r', fout);
884 					if (c == '\0') {
885 						bytes++;
886 						goto contin2;
887 					}
888 					if (c == EOF)
889 						goto contin2;
890 				}
891 			}
892 			(void) putc(c, fout);
893 			bytes++;
894 	contin2:	;
895 		}
896 break2:
897 		if (bare_lfs) {
898 			printf("WARNING! %d bare linefeeds received in ASCII mode\n", bare_lfs);
899 			printf("File may not have transferred correctly.\n");
900 		}
901 		if (hash) {
902 			if (bytes < hashbytes)
903 				(void) putchar('#');
904 			(void) putchar('\n');
905 			(void) fflush(stdout);
906 		}
907 		if (ferror(din)) {
908 			if (errno != EPIPE)
909 				warn("netin");
910 			bytes = -1;
911 		}
912 		if (ferror(fout))
913 			warn("local: %s", local);
914 		break;
915 	}
916 	if (closefunc != NULL)
917 		(*closefunc)(fout);
918 	(void) signal(SIGINT, oldintr);
919 	if (oldintp)
920 		(void) signal(SIGPIPE, oldintp);
921 	(void) gettimeofday(&stop, (struct timezone *)0);
922 	(void) fclose(din);
923 	(void) getreply(0);
924 	if (bytes > 0 && is_retr)
925 		ptransfer("received", bytes, &start, &stop);
926 	return;
927 abort:
928 
929 /* abort using RFC959 recommended IP,SYNC sequence  */
930 
931 	(void) gettimeofday(&stop, (struct timezone *)0);
932 	if (oldintp)
933 		(void) signal(SIGPIPE, oldintr);
934 	(void) signal(SIGINT, SIG_IGN);
935 	if (!cpend) {
936 		code = -1;
937 		(void) signal(SIGINT, oldintr);
938 		return;
939 	}
940 
941 	abort_remote(din);
942 	code = -1;
943 	if (data >= 0) {
944 		(void) close(data);
945 		data = -1;
946 	}
947 	if (closefunc != NULL && fout != NULL)
948 		(*closefunc)(fout);
949 	if (din)
950 		(void) fclose(din);
951 	if (bytes > 0)
952 		ptransfer("received", bytes, &start, &stop);
953 	(void) signal(SIGINT, oldintr);
954 }
955 
956 /*
957  * Need to start a listen on the data channel before we send the command,
958  * otherwise the server's connect may fail.
959  */
960 int
961 initconn()
962 {
963 	char *p, *a;
964 	int result, len, tmpno = 0;
965 	int on = 1;
966 
967 noport:
968 	data_addr = myctladdr;
969 	if (sendport)
970 		data_addr.sin_port = 0;	/* let system pick one */
971 	if (data != -1)
972 		(void) close(data);
973 	data = socket(AF_INET, SOCK_STREAM, 0);
974 	if (data < 0) {
975 		warn("socket");
976 		if (tmpno)
977 			sendport = 1;
978 		return (1);
979 	}
980 	if (!sendport)
981 		if (setsockopt(data, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof (on)) < 0) {
982 			warn("setsockopt (reuse address)");
983 			goto bad;
984 		}
985 	if (bind(data, (struct sockaddr *)&data_addr, sizeof (data_addr)) < 0) {
986 		warn("bind");
987 		goto bad;
988 	}
989 	if (options & SO_DEBUG &&
990 	    setsockopt(data, SOL_SOCKET, SO_DEBUG, (char *)&on, sizeof (on)) < 0)
991 		warn("setsockopt (ignored)");
992 	len = sizeof (data_addr);
993 	if (getsockname(data, (struct sockaddr *)&data_addr, &len) < 0) {
994 		warn("getsockname");
995 		goto bad;
996 	}
997 	if (listen(data, 1) < 0)
998 		warn("listen");
999 	if (sendport) {
1000 		a = (char *)&data_addr.sin_addr;
1001 		p = (char *)&data_addr.sin_port;
1002 #define	UC(b)	(((int)b)&0xff)
1003 		result =
1004 		    command("PORT %d,%d,%d,%d,%d,%d",
1005 		      UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
1006 		      UC(p[0]), UC(p[1]));
1007 		if (result == ERROR && sendport == -1) {
1008 			sendport = 0;
1009 			tmpno = 1;
1010 			goto noport;
1011 		}
1012 		return (result != COMPLETE);
1013 	}
1014 	if (tmpno)
1015 		sendport = 1;
1016 #ifdef IP_TOS
1017 	on = IPTOS_THROUGHPUT;
1018 	if (setsockopt(data, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0)
1019 		warn("setsockopt TOS (ignored)");
1020 #endif
1021 	return (0);
1022 bad:
1023 	(void) close(data), data = -1;
1024 	if (tmpno)
1025 		sendport = 1;
1026 	return (1);
1027 }
1028 
1029 FILE *
1030 dataconn(lmode)
1031 	char *lmode;
1032 {
1033 	struct sockaddr_in from;
1034 	int s, fromlen = sizeof (from), tos;
1035 
1036 	s = accept(data, (struct sockaddr *) &from, &fromlen);
1037 	if (s < 0) {
1038 		warn("accept");
1039 		(void) close(data), data = -1;
1040 		return (NULL);
1041 	}
1042 	(void) close(data);
1043 	data = s;
1044 #ifdef IP_TOS
1045 	tos = IPTOS_THROUGHPUT;
1046 	if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0)
1047 		warn("setsockopt TOS (ignored)");
1048 #endif
1049 	return (fdopen(data, lmode));
1050 }
1051 
1052 void
1053 ptransfer(direction, bytes, t0, t1)
1054 	char *direction;
1055 	long bytes;
1056 	struct timeval *t0, *t1;
1057 {
1058 	struct timeval td;
1059 	float s, bs;
1060 
1061 	if (verbose) {
1062 		tvsub(&td, t1, t0);
1063 		s = td.tv_sec + (td.tv_usec / 1000000.);
1064 #define	nz(x)	((x) == 0 ? 1 : (x))
1065 		bs = bytes / nz(s);
1066 		printf("%ld bytes %s in %.2g seconds (%.2g Kbytes/s)\n",
1067 		    bytes, direction, s, bs / 1024.);
1068 	}
1069 }
1070 
1071 /*
1072 void
1073 tvadd(tsum, t0)
1074 	struct timeval *tsum, *t0;
1075 {
1076 
1077 	tsum->tv_sec += t0->tv_sec;
1078 	tsum->tv_usec += t0->tv_usec;
1079 	if (tsum->tv_usec > 1000000)
1080 		tsum->tv_sec++, tsum->tv_usec -= 1000000;
1081 }
1082 */
1083 
1084 void
1085 tvsub(tdiff, t1, t0)
1086 	struct timeval *tdiff, *t1, *t0;
1087 {
1088 
1089 	tdiff->tv_sec = t1->tv_sec - t0->tv_sec;
1090 	tdiff->tv_usec = t1->tv_usec - t0->tv_usec;
1091 	if (tdiff->tv_usec < 0)
1092 		tdiff->tv_sec--, tdiff->tv_usec += 1000000;
1093 }
1094 
1095 void
1096 psabort()
1097 {
1098 
1099 	abrtflag++;
1100 }
1101 
1102 void
1103 pswitch(flag)
1104 	int flag;
1105 {
1106 	sig_t oldintr;
1107 	static struct comvars {
1108 		int connect;
1109 		char name[MAXHOSTNAMELEN];
1110 		struct sockaddr_in mctl;
1111 		struct sockaddr_in hctl;
1112 		FILE *in;
1113 		FILE *out;
1114 		int tpe;
1115 		int curtpe;
1116 		int cpnd;
1117 		int sunqe;
1118 		int runqe;
1119 		int mcse;
1120 		int ntflg;
1121 		char nti[17];
1122 		char nto[17];
1123 		int mapflg;
1124 		char mi[MAXPATHLEN];
1125 		char mo[MAXPATHLEN];
1126 	} proxstruct, tmpstruct;
1127 	struct comvars *ip, *op;
1128 
1129 	abrtflag = 0;
1130 	oldintr = signal(SIGINT, psabort);
1131 	if (flag) {
1132 		if (proxy)
1133 			return;
1134 		ip = &tmpstruct;
1135 		op = &proxstruct;
1136 		proxy++;
1137 	} else {
1138 		if (!proxy)
1139 			return;
1140 		ip = &proxstruct;
1141 		op = &tmpstruct;
1142 		proxy = 0;
1143 	}
1144 	ip->connect = connected;
1145 	connected = op->connect;
1146 	if (hostname) {
1147 		(void) strncpy(ip->name, hostname, sizeof(ip->name) - 1);
1148 		ip->name[strlen(ip->name)] = '\0';
1149 	} else
1150 		ip->name[0] = 0;
1151 	hostname = op->name;
1152 	ip->hctl = hisctladdr;
1153 	hisctladdr = op->hctl;
1154 	ip->mctl = myctladdr;
1155 	myctladdr = op->mctl;
1156 	ip->in = cin;
1157 	cin = op->in;
1158 	ip->out = cout;
1159 	cout = op->out;
1160 	ip->tpe = type;
1161 	type = op->tpe;
1162 	ip->curtpe = curtype;
1163 	curtype = op->curtpe;
1164 	ip->cpnd = cpend;
1165 	cpend = op->cpnd;
1166 	ip->sunqe = sunique;
1167 	sunique = op->sunqe;
1168 	ip->runqe = runique;
1169 	runique = op->runqe;
1170 	ip->mcse = mcase;
1171 	mcase = op->mcse;
1172 	ip->ntflg = ntflag;
1173 	ntflag = op->ntflg;
1174 	(void) strncpy(ip->nti, ntin, 16);
1175 	(ip->nti)[strlen(ip->nti)] = '\0';
1176 	(void) strcpy(ntin, op->nti);
1177 	(void) strncpy(ip->nto, ntout, 16);
1178 	(ip->nto)[strlen(ip->nto)] = '\0';
1179 	(void) strcpy(ntout, op->nto);
1180 	ip->mapflg = mapflag;
1181 	mapflag = op->mapflg;
1182 	(void) strncpy(ip->mi, mapin, MAXPATHLEN - 1);
1183 	(ip->mi)[strlen(ip->mi)] = '\0';
1184 	(void) strcpy(mapin, op->mi);
1185 	(void) strncpy(ip->mo, mapout, MAXPATHLEN - 1);
1186 	(ip->mo)[strlen(ip->mo)] = '\0';
1187 	(void) strcpy(mapout, op->mo);
1188 	(void) signal(SIGINT, oldintr);
1189 	if (abrtflag) {
1190 		abrtflag = 0;
1191 		(*oldintr)(SIGINT);
1192 	}
1193 }
1194 
1195 void
1196 abortpt()
1197 {
1198 
1199 	printf("\n");
1200 	(void) fflush(stdout);
1201 	ptabflg++;
1202 	mflag = 0;
1203 	abrtflag = 0;
1204 	longjmp(ptabort, 1);
1205 }
1206 
1207 void
1208 proxtrans(cmd, local, remote)
1209 	char *cmd, *local, *remote;
1210 {
1211 	sig_t oldintr;
1212 	int secndflag = 0, prox_type, nfnd;
1213 	char *cmd2;
1214 	struct fd_set mask;
1215 
1216 	if (strcmp(cmd, "RETR"))
1217 		cmd2 = "RETR";
1218 	else
1219 		cmd2 = runique ? "STOU" : "STOR";
1220 	if ((prox_type = type) == 0) {
1221 		if (unix_server && unix_proxy)
1222 			prox_type = TYPE_I;
1223 		else
1224 			prox_type = TYPE_A;
1225 	}
1226 	if (curtype != prox_type)
1227 		changetype(prox_type, 1);
1228 	if (command("PASV") != COMPLETE) {
1229 		printf("proxy server does not support third party transfers.\n");
1230 		return;
1231 	}
1232 	pswitch(0);
1233 	if (!connected) {
1234 		printf("No primary connection\n");
1235 		pswitch(1);
1236 		code = -1;
1237 		return;
1238 	}
1239 	if (curtype != prox_type)
1240 		changetype(prox_type, 1);
1241 	if (command("PORT %s", pasv) != COMPLETE) {
1242 		pswitch(1);
1243 		return;
1244 	}
1245 	if (setjmp(ptabort))
1246 		goto abort;
1247 	oldintr = signal(SIGINT, abortpt);
1248 	if (command("%s %s", cmd, remote) != PRELIM) {
1249 		(void) signal(SIGINT, oldintr);
1250 		pswitch(1);
1251 		return;
1252 	}
1253 	sleep(2);
1254 	pswitch(1);
1255 	secndflag++;
1256 	if (command("%s %s", cmd2, local) != PRELIM)
1257 		goto abort;
1258 	ptflag++;
1259 	(void) getreply(0);
1260 	pswitch(0);
1261 	(void) getreply(0);
1262 	(void) signal(SIGINT, oldintr);
1263 	pswitch(1);
1264 	ptflag = 0;
1265 	printf("local: %s remote: %s\n", local, remote);
1266 	return;
1267 abort:
1268 	(void) signal(SIGINT, SIG_IGN);
1269 	ptflag = 0;
1270 	if (strcmp(cmd, "RETR") && !proxy)
1271 		pswitch(1);
1272 	else if (!strcmp(cmd, "RETR") && proxy)
1273 		pswitch(0);
1274 	if (!cpend && !secndflag) {  /* only here if cmd = "STOR" (proxy=1) */
1275 		if (command("%s %s", cmd2, local) != PRELIM) {
1276 			pswitch(0);
1277 			if (cpend)
1278 				abort_remote((FILE *) NULL);
1279 		}
1280 		pswitch(1);
1281 		if (ptabflg)
1282 			code = -1;
1283 		(void) signal(SIGINT, oldintr);
1284 		return;
1285 	}
1286 	if (cpend)
1287 		abort_remote((FILE *) NULL);
1288 	pswitch(!proxy);
1289 	if (!cpend && !secndflag) {  /* only if cmd = "RETR" (proxy=1) */
1290 		if (command("%s %s", cmd2, local) != PRELIM) {
1291 			pswitch(0);
1292 			if (cpend)
1293 				abort_remote((FILE *) NULL);
1294 			pswitch(1);
1295 			if (ptabflg)
1296 				code = -1;
1297 			(void) signal(SIGINT, oldintr);
1298 			return;
1299 		}
1300 	}
1301 	if (cpend)
1302 		abort_remote((FILE *) NULL);
1303 	pswitch(!proxy);
1304 	if (cpend) {
1305 		FD_ZERO(&mask);
1306 		FD_SET(fileno(cin), &mask);
1307 		if ((nfnd = empty(&mask, 10)) <= 0) {
1308 			if (nfnd < 0) {
1309 				warn("abort");
1310 			}
1311 			if (ptabflg)
1312 				code = -1;
1313 			lostpeer();
1314 		}
1315 		(void) getreply(0);
1316 		(void) getreply(0);
1317 	}
1318 	if (proxy)
1319 		pswitch(0);
1320 	pswitch(1);
1321 	if (ptabflg)
1322 		code = -1;
1323 	(void) signal(SIGINT, oldintr);
1324 }
1325 
1326 void
1327 reset(argc, argv)
1328 	int argc;
1329 	char *argv[];
1330 {
1331 	struct fd_set mask;
1332 	int nfnd = 1;
1333 
1334 	FD_ZERO(&mask);
1335 	while (nfnd > 0) {
1336 		FD_SET(fileno(cin), &mask);
1337 		if ((nfnd = empty(&mask,0)) < 0) {
1338 			warn("reset");
1339 			code = -1;
1340 			lostpeer();
1341 		}
1342 		else if (nfnd) {
1343 			(void) getreply(0);
1344 		}
1345 	}
1346 }
1347 
1348 char *
1349 gunique(local)
1350 	char *local;
1351 {
1352 	static char new[MAXPATHLEN];
1353 	char *cp = strrchr(local, '/');
1354 	int d, count=0;
1355 	char ext = '1';
1356 
1357 	if (cp)
1358 		*cp = '\0';
1359 	d = access(cp ? local : ".", 2);
1360 	if (cp)
1361 		*cp = '/';
1362 	if (d < 0) {
1363 		warn("local: %s", local);
1364 		return ((char *) 0);
1365 	}
1366 	(void) strcpy(new, local);
1367 	cp = new + strlen(new);
1368 	*cp++ = '.';
1369 	while (!d) {
1370 		if (++count == 100) {
1371 			printf("runique: can't find unique file name.\n");
1372 			return ((char *) 0);
1373 		}
1374 		*cp++ = ext;
1375 		*cp = '\0';
1376 		if (ext == '9')
1377 			ext = '0';
1378 		else
1379 			ext++;
1380 		if ((d = access(new, 0)) < 0)
1381 			break;
1382 		if (ext != '0')
1383 			cp--;
1384 		else if (*(cp - 2) == '.')
1385 			*(cp - 1) = '1';
1386 		else {
1387 			*(cp - 2) = *(cp - 2) + 1;
1388 			cp--;
1389 		}
1390 	}
1391 	return (new);
1392 }
1393 
1394 void
1395 abort_remote(din)
1396 	FILE *din;
1397 {
1398 	char buf[BUFSIZ];
1399 	int nfnd;
1400 	struct fd_set mask;
1401 
1402 	/*
1403 	 * send IAC in urgent mode instead of DM because 4.3BSD places oob mark
1404 	 * after urgent byte rather than before as is protocol now
1405 	 */
1406 	sprintf(buf, "%c%c%c", IAC, IP, IAC);
1407 	if (send(fileno(cout), buf, 3, MSG_OOB) != 3)
1408 		warn("abort");
1409 	fprintf(cout,"%cABOR\r\n", DM);
1410 	(void) fflush(cout);
1411 	FD_ZERO(&mask);
1412 	FD_SET(fileno(cin), &mask);
1413 	if (din) {
1414 		FD_SET(fileno(din), &mask);
1415 	}
1416 	if ((nfnd = empty(&mask, 10)) <= 0) {
1417 		if (nfnd < 0) {
1418 			warn("abort");
1419 		}
1420 		if (ptabflg)
1421 			code = -1;
1422 		lostpeer();
1423 	}
1424 	if (din && FD_ISSET(fileno(din), &mask)) {
1425 		while (read(fileno(din), buf, BUFSIZ) > 0)
1426 			/* LOOP */;
1427 	}
1428 	if (getreply(0) == ERROR && code == 552) {
1429 		/* 552 needed for nic style abort */
1430 		(void) getreply(0);
1431 	}
1432 	(void) getreply(0);
1433 }
1434