xref: /openbsd/usr.bin/ftp/main.c (revision 07ea8d15) 
1 /*	$OpenBSD: main.c,v 1.10 1996/12/18 01:59:15 michaels Exp $	*/
2 
3 /*
4  * Copyright (c) 1985, 1989, 1993, 1994
5  *	The Regents of the University of California.  All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. All advertising materials mentioning features or use of this software
16  *    must display the following acknowledgement:
17  *	This product includes software developed by the University of
18  *	California, Berkeley and its contributors.
19  * 4. Neither the name of the University nor the names of its contributors
20  *    may be used to endorse or promote products derived from this software
21  *    without specific prior written permission.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33  * SUCH DAMAGE.
34  */
35 
36 #ifndef lint
37 static char copyright[] =
38 "@(#) Copyright (c) 1985, 1989, 1993, 1994\n\
39 	The Regents of the University of California.  All rights reserved.\n";
40 #endif /* not lint */
41 
42 #ifndef lint
43 #if 0
44 static char sccsid[] = "@(#)main.c	8.6 (Berkeley) 10/9/94";
45 #else
46 static char rcsid[] = "$OpenBSD: main.c,v 1.10 1996/12/18 01:59:15 michaels Exp $";
47 #endif
48 #endif /* not lint */
49 
50 /*
51  * FTP User Program -- Command Interface.
52  */
53 /*#include <sys/ioctl.h>*/
54 #include <sys/types.h>
55 #include <sys/file.h>
56 #include <sys/socket.h>
57 #include <netinet/in.h>
58 
59 #include <arpa/ftp.h>
60 
61 #include <ctype.h>
62 #include <err.h>
63 #include <netdb.h>
64 #include <pwd.h>
65 #include <signal.h>
66 #include <stdio.h>
67 #include <stdlib.h>
68 #include <string.h>
69 #include <unistd.h>
70 
71 #include "ftp_var.h"
72 
73 #define HASHBYTES 1024	/* default buffer size for drawing hash marks */
74 
75 int
76 main(argc, argv)
77 	int argc;
78 	char *argv[];
79 {
80 	int ch, top;
81 	struct passwd *pw = NULL;
82 	char *cp, homedir[MAXPATHLEN];
83 	int force_port = 0;
84 
85 	sp = getservbyname("ftp", "tcp");
86 	if (sp == 0)
87 		errx(1, "ftp/tcp: unknown service");
88 	doglob = 1;
89 	interactive = 1;
90 	autologin = 1;
91 	mark = HASHBYTES;
92 
93 	while ((ch = getopt(argc, argv, "p:r:dgintv")) != EOF) {
94 		switch (ch) {
95 		case 'd':
96 			options |= SO_DEBUG;
97 			debug++;
98 			break;
99 
100 		case 'g':
101 			doglob = 0;
102 			break;
103 
104 		case 'i':
105 			interactive = 0;
106 			break;
107 
108 		case 'n':
109 			autologin = 0;
110 			break;
111 
112 		case 'p':
113 			force_port = atoi(optarg);
114 			break;
115 
116 		case 'r':
117 			if (isdigit(*optarg))
118 				retry_connect = atoi(optarg);
119 			else {
120 				extern char *__progname;
121 				(void)fprintf(stderr,
122 					"%s: -r requires numeric argument\n",
123 					__progname);
124 				exit(1);
125 			}
126 			break;
127 
128 		case 't':
129 			trace++;
130 			break;
131 
132 		case 'v':
133 			verbose++;
134 			break;
135 
136 		default:
137 			(void)fprintf(stderr, "usage: "
138 				"ftp [-dgintv] [-r<seconds>] [host [port]]\n");
139 			exit(1);
140 		}
141 	}
142 	argc -= optind;
143 	argv += optind;
144 
145 	fromatty = isatty(fileno(stdin));
146 	if (fromatty)
147 		verbose++;
148 	cpend = 0;	/* no pending replies */
149 	proxy = 0;	/* proxy not active */
150 	passivemode = 0; /* passive mode not active */
151 	crflag = 1;	/* strip c.r. on ascii gets */
152 	sendport = -1;	/* not using ports */
153 	/*
154 	 * Set up the home directory in case we're globbing.
155 	 */
156 	cp = getlogin();
157 	if (cp != NULL) {
158 		pw = getpwnam(cp);
159 	}
160 	if (pw == NULL)
161 		pw = getpwuid(getuid());
162 	if (pw != NULL) {
163 		home = homedir;
164 		(void) strcpy(home, pw->pw_dir);
165 	}
166 
167 	if (argc > 0 && strchr(argv[0], ':')) {
168 		int ret = 0;
169 		anonftp = 1;
170 
171 		while (argc > 0 && strchr(argv[0], ':')) {
172 			char *xargv[5];
173 			extern char *__progname;
174 			char portstr[20], *p, *bufp = NULL;
175 			char *host = NULL, *dir = NULL, *file = NULL;
176 			int xargc = 2, looping = 0, tmp;
177 
178 			if (setjmp(toplevel))
179 				exit(0);
180 			(void) signal(SIGINT, intr);
181 			(void) signal(SIGPIPE, lostpeer);
182 			xargv[0] = __progname;
183 
184 			host = strdup(argv[0]);
185 			if (host == NULL) {
186 				ret = 1;
187 				goto bail;
188 			}
189 			if (!strncmp(host, "http://", strlen("http://"))) {
190 				http_fetch(host);
191 				goto bail;
192 			}
193 			if (strncmp(host, "ftp://", strlen("ftp://")) == 0) {
194 				host += strlen("ftp://");
195 				p = strchr(host, '/');
196 			}
197 			else
198 				p = strchr(host, ':');
199 			*p = '\0';
200 
201 			xargv[1] = host;
202 			xargc = 2;
203 			if (force_port) {
204 				xargv[xargc++] = portstr;
205 				snprintf(portstr, sizeof portstr, "%d",
206 				    force_port);
207 			}
208 			xargv[xargc] = NULL;
209 		   	setpeer(xargc, xargv);
210 			if (!connected) {
211 				printf("failed to connect to %s\n", host);
212 				ret = 1;
213 				goto bail;
214 			}
215 			*argv = strchr(argv[0], ':') + 1;
216 			do {
217 				dir = *argv;
218 				p = strrchr(dir, '/');
219 				if (p != NULL) {
220 					*p = '\0';
221 					file = ++p;
222 				} else {
223 					file = dir;
224 					dir = NULL;
225 				}
226 				if (dir != NULL && *dir != '\0') {
227 					xargv[1] = dir;
228 					xargv[2] = NULL;
229 					xargc = 2;
230 					cd(xargc, xargv);
231 				}
232 				xargv[1] = *file == '\0' ? "/" : file;
233 				xargv[2] = NULL;
234 				xargc = 2;
235 				tmp = verbose;
236 				verbose = -1;
237 				if (cd(xargc, xargv) == 0) {
238 					verbose = tmp;
239 					goto CLINE_CD;
240 				}
241 				verbose = tmp;
242 				if (!looping) {
243 					setbinary(NULL, 0);
244 					looping = 1;
245 				}
246 				/* fetch file */
247 				xargv[1] = file;
248 				xargv[2] = NULL;
249 				xargc = 2;
250 				get(xargc, xargv);
251 				--argc;
252 				argv++;
253 		} while (argc > 0 && strchr(argv[0], ':') == NULL);
254 
255 			/* get ready for the next file */
256 bail:
257 			if (bufp) {
258 				free(bufp);
259 				bufp = NULL;
260 			}
261 			if (connected)
262 				disconnect(1, xargv);
263 		}
264 		exit(ret);
265 	}
266 	if (argc > 0) {
267 		char *xargv[5];
268 		extern char *__progname;
269 
270 		if (setjmp(toplevel))
271 			exit(0);
272 		(void) signal(SIGINT, intr);
273 		(void) signal(SIGPIPE, lostpeer);
274 		xargv[0] = __progname;
275 		xargv[1] = argv[0];
276 		xargv[2] = argv[1];
277 		xargv[3] = argv[2];
278 		xargv[4] = NULL;
279 		do {
280 			setpeer(argc+1, xargv);
281 			if (!retry_connect)
282 				break;
283 			if (!connected) {
284 				macnum = 0;
285 				printf("Retrying...\n");
286 				sleep(retry_connect);
287 			}
288 		} while (!connected);
289 	}
290 CLINE_CD:
291 	top = setjmp(toplevel) == 0;
292 	if (top) {
293 		(void) signal(SIGINT, intr);
294 		(void) signal(SIGPIPE, lostpeer);
295 	}
296 	for (;;) {
297 		cmdscanner(top);
298 		top = 1;
299 	}
300 }
301 
302 void
303 intr()
304 {
305 
306 	longjmp(toplevel, 1);
307 }
308 
309 void
310 lostpeer()
311 {
312 
313 	if (connected) {
314 		if (cout != NULL) {
315 			(void) shutdown(fileno(cout), 1+1);
316 			(void) fclose(cout);
317 			cout = NULL;
318 		}
319 		if (data >= 0) {
320 			(void) shutdown(data, 1+1);
321 			(void) close(data);
322 			data = -1;
323 		}
324 		connected = 0;
325 	}
326 	pswitch(1);
327 	if (connected) {
328 		if (cout != NULL) {
329 			(void) shutdown(fileno(cout), 1+1);
330 			(void) fclose(cout);
331 			cout = NULL;
332 		}
333 		connected = 0;
334 	}
335 	proxflag = 0;
336 	pswitch(0);
337 }
338 
339 /*
340 char *
341 tail(filename)
342 	char *filename;
343 {
344 	char *s;
345 
346 	while (*filename) {
347 		s = strrchr(filename, '/');
348 		if (s == NULL)
349 			break;
350 		if (s[1])
351 			return (s + 1);
352 		*s = '\0';
353 	}
354 	return (filename);
355 }
356 */
357 
358 /*
359  * Command parser.
360  */
361 void
362 cmdscanner(top)
363 	int top;
364 {
365 	struct cmd *c;
366 	int l;
367 
368 	if (!top)
369 		(void) putchar('\n');
370 	for (;;) {
371 		if (fromatty) {
372 			printf("ftp> ");
373 			(void) fflush(stdout);
374 		}
375 		if (fgets(line, sizeof line, stdin) == NULL)
376 			quit(0, 0);
377 		l = strlen(line);
378 		if (l == 0)
379 			break;
380 		if (line[--l] == '\n') {
381 			if (l == 0)
382 				break;
383 			line[l] = '\0';
384 		} else if (l == sizeof(line) - 2) {
385 			printf("sorry, input line too long\n");
386 			while ((l = getchar()) != '\n' && l != EOF)
387 				/* void */;
388 			break;
389 		} /* else it was a line without a newline */
390 		makeargv();
391 		if (margc == 0) {
392 			continue;
393 		}
394 		c = getcmd(margv[0]);
395 		if (c == (struct cmd *)-1) {
396 			printf("?Ambiguous command\n");
397 			continue;
398 		}
399 		if (c == 0) {
400 			printf("?Invalid command\n");
401 			continue;
402 		}
403 		if (c->c_conn && !connected) {
404 			printf("Not connected.\n");
405 			continue;
406 		}
407 		(*c->c_handler)(margc, margv);
408 		if (bell && c->c_bell)
409 			(void) putchar('\007');
410 		if (c->c_handler != help)
411 			break;
412 	}
413 	(void) signal(SIGINT, intr);
414 	(void) signal(SIGPIPE, lostpeer);
415 }
416 
417 struct cmd *
418 getcmd(name)
419 	char *name;
420 {
421 	char *p, *q;
422 	struct cmd *c, *found;
423 	int nmatches, longest;
424 
425 	if (name == NULL)
426 		return (0);
427 
428 	longest = 0;
429 	nmatches = 0;
430 	found = 0;
431 	for (c = cmdtab; p = c->c_name; c++) {
432 		for (q = name; *q == *p++; q++)
433 			if (*q == 0)		/* exact match? */
434 				return (c);
435 		if (!*q) {			/* the name was a prefix */
436 			if (q - name > longest) {
437 				longest = q - name;
438 				nmatches = 1;
439 				found = c;
440 			} else if (q - name == longest)
441 				nmatches++;
442 		}
443 	}
444 	if (nmatches > 1)
445 		return ((struct cmd *)-1);
446 	return (found);
447 }
448 
449 /*
450  * Slice a string up into argc/argv.
451  */
452 
453 int slrflag;
454 
455 void
456 makeargv()
457 {
458 	char **argp;
459 
460 	argp = margv;
461 	stringbase = line;		/* scan from first of buffer */
462 	argbase = argbuf;		/* store from first of buffer */
463 	slrflag = 0;
464 	for (margc = 0; ; margc++) {
465 		/* Expand array if necessary */
466 		if (margc == margvlen) {
467 			margv = (margvlen == 0)
468 				? (char **)malloc(20 * sizeof(char *))
469 				: (char **)realloc(margv,
470 					(margvlen + 20)*sizeof(char *));
471 			if (margv == NULL)
472 				errx(1, "cannot realloc argv array");
473 			margvlen += 20;
474 			argp = margv + margc;
475 		}
476 
477 		if ((*argp++ = slurpstring()) == NULL)
478 			break;
479 	}
480 
481 }
482 
483 /*
484  * Parse string into argbuf;
485  * implemented with FSM to
486  * handle quoting and strings
487  */
488 char *
489 slurpstring()
490 {
491 	int got_one = 0;
492 	char *sb = stringbase;
493 	char *ap = argbase;
494 	char *tmp = argbase;		/* will return this if token found */
495 
496 	if (*sb == '!' || *sb == '$') {	/* recognize ! as a token for shell */
497 		switch (slrflag) {	/* and $ as token for macro invoke */
498 			case 0:
499 				slrflag++;
500 				stringbase++;
501 				return ((*sb == '!') ? "!" : "$");
502 				/* NOTREACHED */
503 			case 1:
504 				slrflag++;
505 				altarg = stringbase;
506 				break;
507 			default:
508 				break;
509 		}
510 	}
511 
512 S0:
513 	switch (*sb) {
514 
515 	case '\0':
516 		goto OUT;
517 
518 	case ' ':
519 	case '\t':
520 		sb++; goto S0;
521 
522 	default:
523 		switch (slrflag) {
524 			case 0:
525 				slrflag++;
526 				break;
527 			case 1:
528 				slrflag++;
529 				altarg = sb;
530 				break;
531 			default:
532 				break;
533 		}
534 		goto S1;
535 	}
536 
537 S1:
538 	switch (*sb) {
539 
540 	case ' ':
541 	case '\t':
542 	case '\0':
543 		goto OUT;	/* end of token */
544 
545 	case '\\':
546 		sb++; goto S2;	/* slurp next character */
547 
548 	case '"':
549 		sb++; goto S3;	/* slurp quoted string */
550 
551 	default:
552 		*ap++ = *sb++;	/* add character to token */
553 		got_one = 1;
554 		goto S1;
555 	}
556 
557 S2:
558 	switch (*sb) {
559 
560 	case '\0':
561 		goto OUT;
562 
563 	default:
564 		*ap++ = *sb++;
565 		got_one = 1;
566 		goto S1;
567 	}
568 
569 S3:
570 	switch (*sb) {
571 
572 	case '\0':
573 		goto OUT;
574 
575 	case '"':
576 		sb++; goto S1;
577 
578 	default:
579 		*ap++ = *sb++;
580 		got_one = 1;
581 		goto S3;
582 	}
583 
584 OUT:
585 	if (got_one)
586 		*ap++ = '\0';
587 	argbase = ap;			/* update storage pointer */
588 	stringbase = sb;		/* update scan pointer */
589 	if (got_one) {
590 		return (tmp);
591 	}
592 	switch (slrflag) {
593 		case 0:
594 			slrflag++;
595 			break;
596 		case 1:
597 			slrflag++;
598 			altarg = (char *) 0;
599 			break;
600 		default:
601 			break;
602 	}
603 	return ((char *)0);
604 }
605 
606 #define HELPINDENT ((int) sizeof ("directory"))
607 
608 /*
609  * Help command.
610  * Call each command handler with argc == 0 and argv[0] == name.
611  */
612 void
613 help(argc, argv)
614 	int argc;
615 	char *argv[];
616 {
617 	struct cmd *c;
618 
619 	if (argc == 1) {
620 		int i, j, w, k;
621 		int columns, width = 0, lines;
622 
623 		printf("Commands may be abbreviated.  Commands are:\n\n");
624 		for (c = cmdtab; c < &cmdtab[NCMDS]; c++) {
625 			int len = strlen(c->c_name);
626 
627 			if (len > width)
628 				width = len;
629 		}
630 		width = (width + 8) &~ 7;
631 		columns = 80 / width;
632 		if (columns == 0)
633 			columns = 1;
634 		lines = (NCMDS + columns - 1) / columns;
635 		for (i = 0; i < lines; i++) {
636 			for (j = 0; j < columns; j++) {
637 				c = cmdtab + j * lines + i;
638 				if (c->c_name && (!proxy || c->c_proxy)) {
639 					printf("%s", c->c_name);
640 				}
641 				else if (c->c_name) {
642 					for (k=0; k < strlen(c->c_name); k++) {
643 						(void) putchar(' ');
644 					}
645 				}
646 				if (c + lines >= &cmdtab[NCMDS]) {
647 					printf("\n");
648 					break;
649 				}
650 				w = strlen(c->c_name);
651 				while (w < width) {
652 					w = (w + 8) &~ 7;
653 					(void) putchar('\t');
654 				}
655 			}
656 		}
657 		return;
658 	}
659 	while (--argc > 0) {
660 		char *arg;
661 		arg = *++argv;
662 		c = getcmd(arg);
663 		if (c == (struct cmd *)-1)
664 			printf("?Ambiguous help command %s\n", arg);
665 		else if (c == (struct cmd *)0)
666 			printf("?Invalid help command %s\n", arg);
667 		else
668 			printf("%-*s\t%s\n", HELPINDENT,
669 				c->c_name, c->c_help);
670 	}
671 }
672