xref: /original-bsd/usr.bin/ftp/ftp.c (revision 7e5c8007) 
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	8.4 (Berkeley) 04/06/94";
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 		int rc;
505 
506 		switch (curtype) {
507 		case TYPE_A:
508 			rc = fseek(fin, (long) restart_point, SEEK_SET);
509 			break;
510 		case TYPE_I:
511 		case TYPE_L:
512 			rc = lseek(fileno(fin), restart_point, SEEK_SET);
513 			break;
514 		}
515 		if (rc < 0) {
516 			warn("local: %s", local);
517 			restart_point = 0;
518 			if (closefunc != NULL)
519 				(*closefunc)(fin);
520 			return;
521 		}
522 		if (command("REST %ld", (long) restart_point)
523 			!= CONTINUE) {
524 			restart_point = 0;
525 			if (closefunc != NULL)
526 				(*closefunc)(fin);
527 			return;
528 		}
529 		restart_point = 0;
530 		lmode = "r+w";
531 	}
532 	if (remote) {
533 		if (command("%s %s", cmd, remote) != PRELIM) {
534 			(void) signal(SIGINT, oldintr);
535 			if (oldintp)
536 				(void) signal(SIGPIPE, oldintp);
537 			if (closefunc != NULL)
538 				(*closefunc)(fin);
539 			return;
540 		}
541 	} else
542 		if (command("%s", cmd) != PRELIM) {
543 			(void) signal(SIGINT, oldintr);
544 			if (oldintp)
545 				(void) signal(SIGPIPE, oldintp);
546 			if (closefunc != NULL)
547 				(*closefunc)(fin);
548 			return;
549 		}
550 	dout = dataconn(lmode);
551 	if (dout == NULL)
552 		goto abort;
553 	(void) gettimeofday(&start, (struct timezone *)0);
554 	oldintp = signal(SIGPIPE, SIG_IGN);
555 	switch (curtype) {
556 
557 	case TYPE_I:
558 	case TYPE_L:
559 		errno = d = 0;
560 		while ((c = read(fileno(fin), buf, sizeof (buf))) > 0) {
561 			bytes += c;
562 			for (bufp = buf; c > 0; c -= d, bufp += d)
563 				if ((d = write(fileno(dout), bufp, c)) <= 0)
564 					break;
565 			if (hash) {
566 				while (bytes >= hashbytes) {
567 					(void) putchar('#');
568 					hashbytes += HASHBYTES;
569 				}
570 				(void) fflush(stdout);
571 			}
572 		}
573 		if (hash && bytes > 0) {
574 			if (bytes < HASHBYTES)
575 				(void) putchar('#');
576 			(void) putchar('\n');
577 			(void) fflush(stdout);
578 		}
579 		if (c < 0)
580 			warn("local: %s", local);
581 		if (d < 0) {
582 			if (errno != EPIPE)
583 				warn("netout");
584 			bytes = -1;
585 		}
586 		break;
587 
588 	case TYPE_A:
589 		while ((c = getc(fin)) != EOF) {
590 			if (c == '\n') {
591 				while (hash && (bytes >= hashbytes)) {
592 					(void) putchar('#');
593 					(void) fflush(stdout);
594 					hashbytes += HASHBYTES;
595 				}
596 				if (ferror(dout))
597 					break;
598 				(void) putc('\r', dout);
599 				bytes++;
600 			}
601 			(void) putc(c, dout);
602 			bytes++;
603 	/*		if (c == '\r') {			  	*/
604 	/*		(void)	putc('\0', dout);  // this violates rfc */
605 	/*			bytes++;				*/
606 	/*		}                          			*/
607 		}
608 		if (hash) {
609 			if (bytes < hashbytes)
610 				(void) putchar('#');
611 			(void) putchar('\n');
612 			(void) fflush(stdout);
613 		}
614 		if (ferror(fin))
615 			warn("local: %s", local);
616 		if (ferror(dout)) {
617 			if (errno != EPIPE)
618 				warn("netout");
619 			bytes = -1;
620 		}
621 		break;
622 	}
623 	(void) gettimeofday(&stop, (struct timezone *)0);
624 	if (closefunc != NULL)
625 		(*closefunc)(fin);
626 	(void) fclose(dout);
627 	(void) getreply(0);
628 	(void) signal(SIGINT, oldintr);
629 	if (oldintp)
630 		(void) signal(SIGPIPE, oldintp);
631 	if (bytes > 0)
632 		ptransfer("sent", bytes, &start, &stop);
633 	return;
634 abort:
635 	(void) gettimeofday(&stop, (struct timezone *)0);
636 	(void) signal(SIGINT, oldintr);
637 	if (oldintp)
638 		(void) signal(SIGPIPE, oldintp);
639 	if (!cpend) {
640 		code = -1;
641 		return;
642 	}
643 	if (data >= 0) {
644 		(void) close(data);
645 		data = -1;
646 	}
647 	if (dout)
648 		(void) fclose(dout);
649 	(void) getreply(0);
650 	code = -1;
651 	if (closefunc != NULL && fin != NULL)
652 		(*closefunc)(fin);
653 	if (bytes > 0)
654 		ptransfer("sent", bytes, &start, &stop);
655 }
656 
657 jmp_buf	recvabort;
658 
659 void
660 abortrecv()
661 {
662 
663 	mflag = 0;
664 	abrtflag = 0;
665 	printf("\nreceive aborted\nwaiting for remote to finish abort\n");
666 	(void) fflush(stdout);
667 	longjmp(recvabort, 1);
668 }
669 
670 void
671 recvrequest(cmd, local, remote, lmode, printnames)
672 	char *cmd, *local, *remote, *lmode;
673 	int printnames;
674 {
675 	FILE *fout, *din = 0;
676 	int (*closefunc) __P((FILE *));
677 	sig_t oldintr, oldintp;
678 	int c, d, is_retr, tcrflag, bare_lfs = 0;
679 	static int bufsize;
680 	static char *buf;
681 	long bytes = 0, hashbytes = HASHBYTES;
682 	struct timeval start, stop;
683 	struct stat st;
684 
685 	is_retr = strcmp(cmd, "RETR") == 0;
686 	if (is_retr && verbose && printnames) {
687 		if (local && *local != '-')
688 			printf("local: %s ", local);
689 		if (remote)
690 			printf("remote: %s\n", remote);
691 	}
692 	if (proxy && is_retr) {
693 		proxtrans(cmd, local, remote);
694 		return;
695 	}
696 	closefunc = NULL;
697 	oldintr = NULL;
698 	oldintp = NULL;
699 	tcrflag = !crflag && is_retr;
700 	if (setjmp(recvabort)) {
701 		while (cpend) {
702 			(void) getreply(0);
703 		}
704 		if (data >= 0) {
705 			(void) close(data);
706 			data = -1;
707 		}
708 		if (oldintr)
709 			(void) signal(SIGINT, oldintr);
710 		code = -1;
711 		return;
712 	}
713 	oldintr = signal(SIGINT, abortrecv);
714 	if (strcmp(local, "-") && *local != '|') {
715 		if (access(local, 2) < 0) {
716 			char *dir = strrchr(local, '/');
717 
718 			if (errno != ENOENT && errno != EACCES) {
719 				warn("local: %s", local);
720 				(void) signal(SIGINT, oldintr);
721 				code = -1;
722 				return;
723 			}
724 			if (dir != NULL)
725 				*dir = 0;
726 			d = access(dir ? local : ".", 2);
727 			if (dir != NULL)
728 				*dir = '/';
729 			if (d < 0) {
730 				warn("local: %s", local);
731 				(void) signal(SIGINT, oldintr);
732 				code = -1;
733 				return;
734 			}
735 			if (!runique && errno == EACCES &&
736 			    chmod(local, 0600) < 0) {
737 				warn("local: %s", local);
738 				(void) signal(SIGINT, oldintr);
739 				(void) signal(SIGINT, oldintr);
740 				code = -1;
741 				return;
742 			}
743 			if (runique && errno == EACCES &&
744 			   (local = gunique(local)) == NULL) {
745 				(void) signal(SIGINT, oldintr);
746 				code = -1;
747 				return;
748 			}
749 		}
750 		else if (runique && (local = gunique(local)) == NULL) {
751 			(void) signal(SIGINT, oldintr);
752 			code = -1;
753 			return;
754 		}
755 	}
756 	if (!is_retr) {
757 		if (curtype != TYPE_A)
758 			changetype(TYPE_A, 0);
759 	} else if (curtype != type)
760 		changetype(type, 0);
761 	if (initconn()) {
762 		(void) signal(SIGINT, oldintr);
763 		code = -1;
764 		return;
765 	}
766 	if (setjmp(recvabort))
767 		goto abort;
768 	if (is_retr && restart_point &&
769 	    command("REST %ld", (long) restart_point) != CONTINUE)
770 		return;
771 	if (remote) {
772 		if (command("%s %s", cmd, remote) != PRELIM) {
773 			(void) signal(SIGINT, oldintr);
774 			return;
775 		}
776 	} else {
777 		if (command("%s", cmd) != PRELIM) {
778 			(void) signal(SIGINT, oldintr);
779 			return;
780 		}
781 	}
782 	din = dataconn("r");
783 	if (din == NULL)
784 		goto abort;
785 	if (strcmp(local, "-") == 0)
786 		fout = stdout;
787 	else if (*local == '|') {
788 		oldintp = signal(SIGPIPE, SIG_IGN);
789 		fout = popen(local + 1, "w");
790 		if (fout == NULL) {
791 			warn("%s", local+1);
792 			goto abort;
793 		}
794 		closefunc = pclose;
795 	} else {
796 		fout = fopen(local, lmode);
797 		if (fout == NULL) {
798 			warn("local: %s", local);
799 			goto abort;
800 		}
801 		closefunc = fclose;
802 	}
803 	if (fstat(fileno(fout), &st) < 0 || st.st_blksize == 0)
804 		st.st_blksize = BUFSIZ;
805 	if (st.st_blksize > bufsize) {
806 		if (buf)
807 			(void) free(buf);
808 		buf = malloc((unsigned)st.st_blksize);
809 		if (buf == NULL) {
810 			warn("malloc");
811 			bufsize = 0;
812 			goto abort;
813 		}
814 		bufsize = st.st_blksize;
815 	}
816 	(void) gettimeofday(&start, (struct timezone *)0);
817 	switch (curtype) {
818 
819 	case TYPE_I:
820 	case TYPE_L:
821 		if (restart_point &&
822 		    lseek(fileno(fout), restart_point, SEEK_SET) < 0) {
823 			warn("local: %s", local);
824 			if (closefunc != NULL)
825 				(*closefunc)(fout);
826 			return;
827 		}
828 		errno = d = 0;
829 		while ((c = read(fileno(din), buf, bufsize)) > 0) {
830 			if ((d = write(fileno(fout), buf, c)) != c)
831 				break;
832 			bytes += c;
833 			if (hash) {
834 				while (bytes >= hashbytes) {
835 					(void) putchar('#');
836 					hashbytes += HASHBYTES;
837 				}
838 				(void) fflush(stdout);
839 			}
840 		}
841 		if (hash && bytes > 0) {
842 			if (bytes < HASHBYTES)
843 				(void) putchar('#');
844 			(void) putchar('\n');
845 			(void) fflush(stdout);
846 		}
847 		if (c < 0) {
848 			if (errno != EPIPE)
849 				warn("netin");
850 			bytes = -1;
851 		}
852 		if (d < c) {
853 			if (d < 0)
854 				warn("local: %s", local);
855 			else
856 				warnx("%s: short write", local);
857 		}
858 		break;
859 
860 	case TYPE_A:
861 		if (restart_point) {
862 			int i, n, ch;
863 
864 			if (fseek(fout, 0L, SEEK_SET) < 0)
865 				goto done;
866 			n = restart_point;
867 			for (i = 0; i++ < n;) {
868 				if ((ch = getc(fout)) == EOF)
869 					goto done;
870 				if (ch == '\n')
871 					i++;
872 			}
873 			if (fseek(fout, 0L, SEEK_CUR) < 0) {
874 done:
875 				warn("local: %s", local);
876 				if (closefunc != NULL)
877 					(*closefunc)(fout);
878 				return;
879 			}
880 		}
881 		while ((c = getc(din)) != EOF) {
882 			if (c == '\n')
883 				bare_lfs++;
884 			while (c == '\r') {
885 				while (hash && (bytes >= hashbytes)) {
886 					(void) putchar('#');
887 					(void) fflush(stdout);
888 					hashbytes += HASHBYTES;
889 				}
890 				bytes++;
891 				if ((c = getc(din)) != '\n' || tcrflag) {
892 					if (ferror(fout))
893 						goto break2;
894 					(void) putc('\r', fout);
895 					if (c == '\0') {
896 						bytes++;
897 						goto contin2;
898 					}
899 					if (c == EOF)
900 						goto contin2;
901 				}
902 			}
903 			(void) putc(c, fout);
904 			bytes++;
905 	contin2:	;
906 		}
907 break2:
908 		if (bare_lfs) {
909 			printf("WARNING! %d bare linefeeds received in ASCII mode\n", bare_lfs);
910 			printf("File may not have transferred correctly.\n");
911 		}
912 		if (hash) {
913 			if (bytes < hashbytes)
914 				(void) putchar('#');
915 			(void) putchar('\n');
916 			(void) fflush(stdout);
917 		}
918 		if (ferror(din)) {
919 			if (errno != EPIPE)
920 				warn("netin");
921 			bytes = -1;
922 		}
923 		if (ferror(fout))
924 			warn("local: %s", local);
925 		break;
926 	}
927 	if (closefunc != NULL)
928 		(*closefunc)(fout);
929 	(void) signal(SIGINT, oldintr);
930 	if (oldintp)
931 		(void) signal(SIGPIPE, oldintp);
932 	(void) gettimeofday(&stop, (struct timezone *)0);
933 	(void) fclose(din);
934 	(void) getreply(0);
935 	if (bytes > 0 && is_retr)
936 		ptransfer("received", bytes, &start, &stop);
937 	return;
938 abort:
939 
940 /* abort using RFC959 recommended IP,SYNC sequence  */
941 
942 	(void) gettimeofday(&stop, (struct timezone *)0);
943 	if (oldintp)
944 		(void) signal(SIGPIPE, oldintr);
945 	(void) signal(SIGINT, SIG_IGN);
946 	if (!cpend) {
947 		code = -1;
948 		(void) signal(SIGINT, oldintr);
949 		return;
950 	}
951 
952 	abort_remote(din);
953 	code = -1;
954 	if (data >= 0) {
955 		(void) close(data);
956 		data = -1;
957 	}
958 	if (closefunc != NULL && fout != NULL)
959 		(*closefunc)(fout);
960 	if (din)
961 		(void) fclose(din);
962 	if (bytes > 0)
963 		ptransfer("received", bytes, &start, &stop);
964 	(void) signal(SIGINT, oldintr);
965 }
966 
967 /*
968  * Need to start a listen on the data channel before we send the command,
969  * otherwise the server's connect may fail.
970  */
971 int
972 initconn()
973 {
974 	char *p, *a;
975 	int result, len, tmpno = 0;
976 	int on = 1;
977 
978 noport:
979 	data_addr = myctladdr;
980 	if (sendport)
981 		data_addr.sin_port = 0;	/* let system pick one */
982 	if (data != -1)
983 		(void) close(data);
984 	data = socket(AF_INET, SOCK_STREAM, 0);
985 	if (data < 0) {
986 		warn("socket");
987 		if (tmpno)
988 			sendport = 1;
989 		return (1);
990 	}
991 	if (!sendport)
992 		if (setsockopt(data, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof (on)) < 0) {
993 			warn("setsockopt (reuse address)");
994 			goto bad;
995 		}
996 	if (bind(data, (struct sockaddr *)&data_addr, sizeof (data_addr)) < 0) {
997 		warn("bind");
998 		goto bad;
999 	}
1000 	if (options & SO_DEBUG &&
1001 	    setsockopt(data, SOL_SOCKET, SO_DEBUG, (char *)&on, sizeof (on)) < 0)
1002 		warn("setsockopt (ignored)");
1003 	len = sizeof (data_addr);
1004 	if (getsockname(data, (struct sockaddr *)&data_addr, &len) < 0) {
1005 		warn("getsockname");
1006 		goto bad;
1007 	}
1008 	if (listen(data, 1) < 0)
1009 		warn("listen");
1010 	if (sendport) {
1011 		a = (char *)&data_addr.sin_addr;
1012 		p = (char *)&data_addr.sin_port;
1013 #define	UC(b)	(((int)b)&0xff)
1014 		result =
1015 		    command("PORT %d,%d,%d,%d,%d,%d",
1016 		      UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
1017 		      UC(p[0]), UC(p[1]));
1018 		if (result == ERROR && sendport == -1) {
1019 			sendport = 0;
1020 			tmpno = 1;
1021 			goto noport;
1022 		}
1023 		return (result != COMPLETE);
1024 	}
1025 	if (tmpno)
1026 		sendport = 1;
1027 #ifdef IP_TOS
1028 	on = IPTOS_THROUGHPUT;
1029 	if (setsockopt(data, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0)
1030 		warn("setsockopt TOS (ignored)");
1031 #endif
1032 	return (0);
1033 bad:
1034 	(void) close(data), data = -1;
1035 	if (tmpno)
1036 		sendport = 1;
1037 	return (1);
1038 }
1039 
1040 FILE *
1041 dataconn(lmode)
1042 	char *lmode;
1043 {
1044 	struct sockaddr_in from;
1045 	int s, fromlen = sizeof (from), tos;
1046 
1047 	s = accept(data, (struct sockaddr *) &from, &fromlen);
1048 	if (s < 0) {
1049 		warn("accept");
1050 		(void) close(data), data = -1;
1051 		return (NULL);
1052 	}
1053 	(void) close(data);
1054 	data = s;
1055 #ifdef IP_TOS
1056 	tos = IPTOS_THROUGHPUT;
1057 	if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0)
1058 		warn("setsockopt TOS (ignored)");
1059 #endif
1060 	return (fdopen(data, lmode));
1061 }
1062 
1063 void
1064 ptransfer(direction, bytes, t0, t1)
1065 	char *direction;
1066 	long bytes;
1067 	struct timeval *t0, *t1;
1068 {
1069 	struct timeval td;
1070 	float s, bs;
1071 
1072 	if (verbose) {
1073 		tvsub(&td, t1, t0);
1074 		s = td.tv_sec + (td.tv_usec / 1000000.);
1075 #define	nz(x)	((x) == 0 ? 1 : (x))
1076 		bs = bytes / nz(s);
1077 		printf("%ld bytes %s in %.2g seconds (%.2g Kbytes/s)\n",
1078 		    bytes, direction, s, bs / 1024.);
1079 	}
1080 }
1081 
1082 /*
1083 void
1084 tvadd(tsum, t0)
1085 	struct timeval *tsum, *t0;
1086 {
1087 
1088 	tsum->tv_sec += t0->tv_sec;
1089 	tsum->tv_usec += t0->tv_usec;
1090 	if (tsum->tv_usec > 1000000)
1091 		tsum->tv_sec++, tsum->tv_usec -= 1000000;
1092 }
1093 */
1094 
1095 void
1096 tvsub(tdiff, t1, t0)
1097 	struct timeval *tdiff, *t1, *t0;
1098 {
1099 
1100 	tdiff->tv_sec = t1->tv_sec - t0->tv_sec;
1101 	tdiff->tv_usec = t1->tv_usec - t0->tv_usec;
1102 	if (tdiff->tv_usec < 0)
1103 		tdiff->tv_sec--, tdiff->tv_usec += 1000000;
1104 }
1105 
1106 void
1107 psabort()
1108 {
1109 
1110 	abrtflag++;
1111 }
1112 
1113 void
1114 pswitch(flag)
1115 	int flag;
1116 {
1117 	sig_t oldintr;
1118 	static struct comvars {
1119 		int connect;
1120 		char name[MAXHOSTNAMELEN];
1121 		struct sockaddr_in mctl;
1122 		struct sockaddr_in hctl;
1123 		FILE *in;
1124 		FILE *out;
1125 		int tpe;
1126 		int curtpe;
1127 		int cpnd;
1128 		int sunqe;
1129 		int runqe;
1130 		int mcse;
1131 		int ntflg;
1132 		char nti[17];
1133 		char nto[17];
1134 		int mapflg;
1135 		char mi[MAXPATHLEN];
1136 		char mo[MAXPATHLEN];
1137 	} proxstruct, tmpstruct;
1138 	struct comvars *ip, *op;
1139 
1140 	abrtflag = 0;
1141 	oldintr = signal(SIGINT, psabort);
1142 	if (flag) {
1143 		if (proxy)
1144 			return;
1145 		ip = &tmpstruct;
1146 		op = &proxstruct;
1147 		proxy++;
1148 	} else {
1149 		if (!proxy)
1150 			return;
1151 		ip = &proxstruct;
1152 		op = &tmpstruct;
1153 		proxy = 0;
1154 	}
1155 	ip->connect = connected;
1156 	connected = op->connect;
1157 	if (hostname) {
1158 		(void) strncpy(ip->name, hostname, sizeof(ip->name) - 1);
1159 		ip->name[strlen(ip->name)] = '\0';
1160 	} else
1161 		ip->name[0] = 0;
1162 	hostname = op->name;
1163 	ip->hctl = hisctladdr;
1164 	hisctladdr = op->hctl;
1165 	ip->mctl = myctladdr;
1166 	myctladdr = op->mctl;
1167 	ip->in = cin;
1168 	cin = op->in;
1169 	ip->out = cout;
1170 	cout = op->out;
1171 	ip->tpe = type;
1172 	type = op->tpe;
1173 	ip->curtpe = curtype;
1174 	curtype = op->curtpe;
1175 	ip->cpnd = cpend;
1176 	cpend = op->cpnd;
1177 	ip->sunqe = sunique;
1178 	sunique = op->sunqe;
1179 	ip->runqe = runique;
1180 	runique = op->runqe;
1181 	ip->mcse = mcase;
1182 	mcase = op->mcse;
1183 	ip->ntflg = ntflag;
1184 	ntflag = op->ntflg;
1185 	(void) strncpy(ip->nti, ntin, 16);
1186 	(ip->nti)[strlen(ip->nti)] = '\0';
1187 	(void) strcpy(ntin, op->nti);
1188 	(void) strncpy(ip->nto, ntout, 16);
1189 	(ip->nto)[strlen(ip->nto)] = '\0';
1190 	(void) strcpy(ntout, op->nto);
1191 	ip->mapflg = mapflag;
1192 	mapflag = op->mapflg;
1193 	(void) strncpy(ip->mi, mapin, MAXPATHLEN - 1);
1194 	(ip->mi)[strlen(ip->mi)] = '\0';
1195 	(void) strcpy(mapin, op->mi);
1196 	(void) strncpy(ip->mo, mapout, MAXPATHLEN - 1);
1197 	(ip->mo)[strlen(ip->mo)] = '\0';
1198 	(void) strcpy(mapout, op->mo);
1199 	(void) signal(SIGINT, oldintr);
1200 	if (abrtflag) {
1201 		abrtflag = 0;
1202 		(*oldintr)(SIGINT);
1203 	}
1204 }
1205 
1206 void
1207 abortpt()
1208 {
1209 
1210 	printf("\n");
1211 	(void) fflush(stdout);
1212 	ptabflg++;
1213 	mflag = 0;
1214 	abrtflag = 0;
1215 	longjmp(ptabort, 1);
1216 }
1217 
1218 void
1219 proxtrans(cmd, local, remote)
1220 	char *cmd, *local, *remote;
1221 {
1222 	sig_t oldintr;
1223 	int secndflag = 0, prox_type, nfnd;
1224 	char *cmd2;
1225 	struct fd_set mask;
1226 
1227 	if (strcmp(cmd, "RETR"))
1228 		cmd2 = "RETR";
1229 	else
1230 		cmd2 = runique ? "STOU" : "STOR";
1231 	if ((prox_type = type) == 0) {
1232 		if (unix_server && unix_proxy)
1233 			prox_type = TYPE_I;
1234 		else
1235 			prox_type = TYPE_A;
1236 	}
1237 	if (curtype != prox_type)
1238 		changetype(prox_type, 1);
1239 	if (command("PASV") != COMPLETE) {
1240 		printf("proxy server does not support third party transfers.\n");
1241 		return;
1242 	}
1243 	pswitch(0);
1244 	if (!connected) {
1245 		printf("No primary connection\n");
1246 		pswitch(1);
1247 		code = -1;
1248 		return;
1249 	}
1250 	if (curtype != prox_type)
1251 		changetype(prox_type, 1);
1252 	if (command("PORT %s", pasv) != COMPLETE) {
1253 		pswitch(1);
1254 		return;
1255 	}
1256 	if (setjmp(ptabort))
1257 		goto abort;
1258 	oldintr = signal(SIGINT, abortpt);
1259 	if (command("%s %s", cmd, remote) != PRELIM) {
1260 		(void) signal(SIGINT, oldintr);
1261 		pswitch(1);
1262 		return;
1263 	}
1264 	sleep(2);
1265 	pswitch(1);
1266 	secndflag++;
1267 	if (command("%s %s", cmd2, local) != PRELIM)
1268 		goto abort;
1269 	ptflag++;
1270 	(void) getreply(0);
1271 	pswitch(0);
1272 	(void) getreply(0);
1273 	(void) signal(SIGINT, oldintr);
1274 	pswitch(1);
1275 	ptflag = 0;
1276 	printf("local: %s remote: %s\n", local, remote);
1277 	return;
1278 abort:
1279 	(void) signal(SIGINT, SIG_IGN);
1280 	ptflag = 0;
1281 	if (strcmp(cmd, "RETR") && !proxy)
1282 		pswitch(1);
1283 	else if (!strcmp(cmd, "RETR") && proxy)
1284 		pswitch(0);
1285 	if (!cpend && !secndflag) {  /* only here if cmd = "STOR" (proxy=1) */
1286 		if (command("%s %s", cmd2, local) != PRELIM) {
1287 			pswitch(0);
1288 			if (cpend)
1289 				abort_remote((FILE *) NULL);
1290 		}
1291 		pswitch(1);
1292 		if (ptabflg)
1293 			code = -1;
1294 		(void) signal(SIGINT, oldintr);
1295 		return;
1296 	}
1297 	if (cpend)
1298 		abort_remote((FILE *) NULL);
1299 	pswitch(!proxy);
1300 	if (!cpend && !secndflag) {  /* only if cmd = "RETR" (proxy=1) */
1301 		if (command("%s %s", cmd2, local) != PRELIM) {
1302 			pswitch(0);
1303 			if (cpend)
1304 				abort_remote((FILE *) NULL);
1305 			pswitch(1);
1306 			if (ptabflg)
1307 				code = -1;
1308 			(void) signal(SIGINT, oldintr);
1309 			return;
1310 		}
1311 	}
1312 	if (cpend)
1313 		abort_remote((FILE *) NULL);
1314 	pswitch(!proxy);
1315 	if (cpend) {
1316 		FD_ZERO(&mask);
1317 		FD_SET(fileno(cin), &mask);
1318 		if ((nfnd = empty(&mask, 10)) <= 0) {
1319 			if (nfnd < 0) {
1320 				warn("abort");
1321 			}
1322 			if (ptabflg)
1323 				code = -1;
1324 			lostpeer();
1325 		}
1326 		(void) getreply(0);
1327 		(void) getreply(0);
1328 	}
1329 	if (proxy)
1330 		pswitch(0);
1331 	pswitch(1);
1332 	if (ptabflg)
1333 		code = -1;
1334 	(void) signal(SIGINT, oldintr);
1335 }
1336 
1337 void
1338 reset(argc, argv)
1339 	int argc;
1340 	char *argv[];
1341 {
1342 	struct fd_set mask;
1343 	int nfnd = 1;
1344 
1345 	FD_ZERO(&mask);
1346 	while (nfnd > 0) {
1347 		FD_SET(fileno(cin), &mask);
1348 		if ((nfnd = empty(&mask,0)) < 0) {
1349 			warn("reset");
1350 			code = -1;
1351 			lostpeer();
1352 		}
1353 		else if (nfnd) {
1354 			(void) getreply(0);
1355 		}
1356 	}
1357 }
1358 
1359 char *
1360 gunique(local)
1361 	char *local;
1362 {
1363 	static char new[MAXPATHLEN];
1364 	char *cp = strrchr(local, '/');
1365 	int d, count=0;
1366 	char ext = '1';
1367 
1368 	if (cp)
1369 		*cp = '\0';
1370 	d = access(cp ? local : ".", 2);
1371 	if (cp)
1372 		*cp = '/';
1373 	if (d < 0) {
1374 		warn("local: %s", local);
1375 		return ((char *) 0);
1376 	}
1377 	(void) strcpy(new, local);
1378 	cp = new + strlen(new);
1379 	*cp++ = '.';
1380 	while (!d) {
1381 		if (++count == 100) {
1382 			printf("runique: can't find unique file name.\n");
1383 			return ((char *) 0);
1384 		}
1385 		*cp++ = ext;
1386 		*cp = '\0';
1387 		if (ext == '9')
1388 			ext = '0';
1389 		else
1390 			ext++;
1391 		if ((d = access(new, 0)) < 0)
1392 			break;
1393 		if (ext != '0')
1394 			cp--;
1395 		else if (*(cp - 2) == '.')
1396 			*(cp - 1) = '1';
1397 		else {
1398 			*(cp - 2) = *(cp - 2) + 1;
1399 			cp--;
1400 		}
1401 	}
1402 	return (new);
1403 }
1404 
1405 void
1406 abort_remote(din)
1407 	FILE *din;
1408 {
1409 	char buf[BUFSIZ];
1410 	int nfnd;
1411 	struct fd_set mask;
1412 
1413 	/*
1414 	 * send IAC in urgent mode instead of DM because 4.3BSD places oob mark
1415 	 * after urgent byte rather than before as is protocol now
1416 	 */
1417 	sprintf(buf, "%c%c%c", IAC, IP, IAC);
1418 	if (send(fileno(cout), buf, 3, MSG_OOB) != 3)
1419 		warn("abort");
1420 	fprintf(cout,"%cABOR\r\n", DM);
1421 	(void) fflush(cout);
1422 	FD_ZERO(&mask);
1423 	FD_SET(fileno(cin), &mask);
1424 	if (din) {
1425 		FD_SET(fileno(din), &mask);
1426 	}
1427 	if ((nfnd = empty(&mask, 10)) <= 0) {
1428 		if (nfnd < 0) {
1429 			warn("abort");
1430 		}
1431 		if (ptabflg)
1432 			code = -1;
1433 		lostpeer();
1434 	}
1435 	if (din && FD_ISSET(fileno(din), &mask)) {
1436 		while (read(fileno(din), buf, BUFSIZ) > 0)
1437 			/* LOOP */;
1438 	}
1439 	if (getreply(0) == ERROR && code == 552) {
1440 		/* 552 needed for nic style abort */
1441 		(void) getreply(0);
1442 	}
1443 	(void) getreply(0);
1444 }
1445