xref: /original-bsd/usr.bin/ftp/main.c (revision 8a09dcfb) 
1 /*
2  * Copyright (c) 1985, 1989 Regents of the University of California.
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms are permitted
6  * provided that the above copyright notice and this paragraph are
7  * duplicated in all such forms and that any documentation,
8  * advertising materials, and other materials related to such
9  * distribution and use acknowledge that the software was developed
10  * by the University of California, Berkeley.  The name of the
11  * University may not be used to endorse or promote products derived
12  * from this software without specific prior written permission.
13  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
14  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
16  */
17 
18 #ifndef lint
19 char copyright[] =
20 "@(#) Copyright (c) 1985, 1989 Regents of the University of California.\n\
21  All rights reserved.\n";
22 #endif /* not lint */
23 
24 #ifndef lint
25 static char sccsid[] = "@(#)main.c	5.15 (Berkeley) 05/26/89";
26 #endif /* not lint */
27 
28 /*
29  * FTP User Program -- Command Interface.
30  */
31 #include "ftp_var.h"
32 #include <sys/socket.h>
33 #include <sys/ioctl.h>
34 #include <sys/types.h>
35 
36 #include <arpa/ftp.h>
37 
38 #include <signal.h>
39 #include <stdio.h>
40 #include <errno.h>
41 #include <ctype.h>
42 #include <netdb.h>
43 #include <pwd.h>
44 
45 uid_t	getuid();
46 sig_t	intr();
47 sig_t	lostpeer();
48 extern	char *home;
49 char	*getlogin();
50 
51 main(argc, argv)
52 	char *argv[];
53 {
54 	register char *cp;
55 	int top;
56 	struct passwd *pw = NULL;
57 	char homedir[MAXPATHLEN];
58 
59 	sp = getservbyname("ftp", "tcp");
60 	if (sp == 0) {
61 		fprintf(stderr, "ftp: ftp/tcp: unknown service\n");
62 		exit(1);
63 	}
64 	doglob = 1;
65 	interactive = 1;
66 	autologin = 1;
67 	argc--, argv++;
68 	while (argc > 0 && **argv == '-') {
69 		for (cp = *argv + 1; *cp; cp++)
70 			switch (*cp) {
71 
72 			case 'd':
73 				options |= SO_DEBUG;
74 				debug++;
75 				break;
76 
77 			case 'v':
78 				verbose++;
79 				break;
80 
81 			case 't':
82 				trace++;
83 				break;
84 
85 			case 'i':
86 				interactive = 0;
87 				break;
88 
89 			case 'n':
90 				autologin = 0;
91 				break;
92 
93 			case 'g':
94 				doglob = 0;
95 				break;
96 
97 			default:
98 				fprintf(stdout,
99 				  "ftp: %c: unknown option\n", *cp);
100 				exit(1);
101 			}
102 		argc--, argv++;
103 	}
104 	fromatty = isatty(fileno(stdin));
105 	if (fromatty)
106 		verbose++;
107 	cpend = 0;	/* no pending replies */
108 	proxy = 0;	/* proxy not active */
109 	crflag = 1;	/* strip c.r. on ascii gets */
110 	sendport = -1;	/* not using ports */
111 	/*
112 	 * Set up the home directory in case we're globbing.
113 	 */
114 	cp = getlogin();
115 	if (cp != NULL) {
116 		pw = getpwnam(cp);
117 	}
118 	if (pw == NULL)
119 		pw = getpwuid(getuid());
120 	if (pw != NULL) {
121 		home = homedir;
122 		(void) strcpy(home, pw->pw_dir);
123 	}
124 	if (argc > 0) {
125 		if (setjmp(toplevel))
126 			exit(0);
127 		(void) signal(SIGINT, intr);
128 		(void) signal(SIGPIPE, lostpeer);
129 		setpeer(argc + 1, argv - 1);
130 	}
131 	top = setjmp(toplevel) == 0;
132 	if (top) {
133 		(void) signal(SIGINT, intr);
134 		(void) signal(SIGPIPE, lostpeer);
135 	}
136 	for (;;) {
137 		cmdscanner(top);
138 		top = 1;
139 	}
140 }
141 
142 sig_t
143 intr()
144 {
145 
146 	longjmp(toplevel, 1);
147 }
148 
149 sig_t
150 lostpeer()
151 {
152 	extern FILE *cout;
153 	extern int data;
154 
155 	if (connected) {
156 		if (cout != NULL) {
157 			(void) shutdown(fileno(cout), 1+1);
158 			(void) fclose(cout);
159 			cout = NULL;
160 		}
161 		if (data >= 0) {
162 			(void) shutdown(data, 1+1);
163 			(void) close(data);
164 			data = -1;
165 		}
166 		connected = 0;
167 	}
168 	pswitch(1);
169 	if (connected) {
170 		if (cout != NULL) {
171 			(void) shutdown(fileno(cout), 1+1);
172 			(void) fclose(cout);
173 			cout = NULL;
174 		}
175 		connected = 0;
176 	}
177 	proxflag = 0;
178 	pswitch(0);
179 }
180 
181 /*char *
182 tail(filename)
183 	char *filename;
184 {
185 	register char *s;
186 
187 	while (*filename) {
188 		s = rindex(filename, '/');
189 		if (s == NULL)
190 			break;
191 		if (s[1])
192 			return (s + 1);
193 		*s = '\0';
194 	}
195 	return (filename);
196 }
197 */
198 /*
199  * Command parser.
200  */
201 cmdscanner(top)
202 	int top;
203 {
204 	register struct cmd *c;
205 	struct cmd *getcmd();
206 	extern int help();
207 
208 	if (!top)
209 		(void) putchar('\n');
210 	for (;;) {
211 		if (fromatty) {
212 			printf("ftp> ");
213 			(void) fflush(stdout);
214 		}
215 		if (gets(line) == 0) {
216 			if (feof(stdin) || ferror(stdin))
217 				quit();
218 			break;
219 		}
220 		if (line[0] == 0)
221 			break;
222 		makeargv();
223 		if (margc == 0) {
224 			continue;
225 		}
226 		c = getcmd(margv[0]);
227 		if (c == (struct cmd *)-1) {
228 			printf("?Ambiguous command\n");
229 			continue;
230 		}
231 		if (c == 0) {
232 			printf("?Invalid command\n");
233 			continue;
234 		}
235 		if (c->c_conn && !connected) {
236 			printf ("Not connected.\n");
237 			continue;
238 		}
239 		(*c->c_handler)(margc, margv);
240 		if (bell && c->c_bell)
241 			(void) putchar('\007');
242 		if (c->c_handler != help)
243 			break;
244 	}
245 	(void) signal(SIGINT, intr);
246 	(void) signal(SIGPIPE, lostpeer);
247 }
248 
249 struct cmd *
250 getcmd(name)
251 	register char *name;
252 {
253 	extern struct cmd cmdtab[];
254 	register char *p, *q;
255 	register struct cmd *c, *found;
256 	register int nmatches, longest;
257 
258 	longest = 0;
259 	nmatches = 0;
260 	found = 0;
261 	for (c = cmdtab; p = c->c_name; c++) {
262 		for (q = name; *q == *p++; q++)
263 			if (*q == 0)		/* exact match? */
264 				return (c);
265 		if (!*q) {			/* the name was a prefix */
266 			if (q - name > longest) {
267 				longest = q - name;
268 				nmatches = 1;
269 				found = c;
270 			} else if (q - name == longest)
271 				nmatches++;
272 		}
273 	}
274 	if (nmatches > 1)
275 		return ((struct cmd *)-1);
276 	return (found);
277 }
278 
279 /*
280  * Slice a string up into argc/argv.
281  */
282 
283 int slrflag;
284 
285 makeargv()
286 {
287 	char **argp;
288 	char *slurpstring();
289 
290 	margc = 0;
291 	argp = margv;
292 	stringbase = line;		/* scan from first of buffer */
293 	argbase = argbuf;		/* store from first of buffer */
294 	slrflag = 0;
295 	while (*argp++ = slurpstring())
296 		margc++;
297 }
298 
299 /*
300  * Parse string into argbuf;
301  * implemented with FSM to
302  * handle quoting and strings
303  */
304 char *
305 slurpstring()
306 {
307 	int got_one = 0;
308 	register char *sb = stringbase;
309 	register char *ap = argbase;
310 	char *tmp = argbase;		/* will return this if token found */
311 
312 	if (*sb == '!' || *sb == '$') {	/* recognize ! as a token for shell */
313 		switch (slrflag) {	/* and $ as token for macro invoke */
314 			case 0:
315 				slrflag++;
316 				stringbase++;
317 				return ((*sb == '!') ? "!" : "$");
318 				/* NOTREACHED */
319 			case 1:
320 				slrflag++;
321 				altarg = stringbase;
322 				break;
323 			default:
324 				break;
325 		}
326 	}
327 
328 S0:
329 	switch (*sb) {
330 
331 	case '\0':
332 		goto OUT;
333 
334 	case ' ':
335 	case '\t':
336 		sb++; goto S0;
337 
338 	default:
339 		switch (slrflag) {
340 			case 0:
341 				slrflag++;
342 				break;
343 			case 1:
344 				slrflag++;
345 				altarg = sb;
346 				break;
347 			default:
348 				break;
349 		}
350 		goto S1;
351 	}
352 
353 S1:
354 	switch (*sb) {
355 
356 	case ' ':
357 	case '\t':
358 	case '\0':
359 		goto OUT;	/* end of token */
360 
361 	case '\\':
362 		sb++; goto S2;	/* slurp next character */
363 
364 	case '"':
365 		sb++; goto S3;	/* slurp quoted string */
366 
367 	default:
368 		*ap++ = *sb++;	/* add character to token */
369 		got_one = 1;
370 		goto S1;
371 	}
372 
373 S2:
374 	switch (*sb) {
375 
376 	case '\0':
377 		goto OUT;
378 
379 	default:
380 		*ap++ = *sb++;
381 		got_one = 1;
382 		goto S1;
383 	}
384 
385 S3:
386 	switch (*sb) {
387 
388 	case '\0':
389 		goto OUT;
390 
391 	case '"':
392 		sb++; goto S1;
393 
394 	default:
395 		*ap++ = *sb++;
396 		got_one = 1;
397 		goto S3;
398 	}
399 
400 OUT:
401 	if (got_one)
402 		*ap++ = '\0';
403 	argbase = ap;			/* update storage pointer */
404 	stringbase = sb;		/* update scan pointer */
405 	if (got_one) {
406 		return(tmp);
407 	}
408 	switch (slrflag) {
409 		case 0:
410 			slrflag++;
411 			break;
412 		case 1:
413 			slrflag++;
414 			altarg = (char *) 0;
415 			break;
416 		default:
417 			break;
418 	}
419 	return((char *)0);
420 }
421 
422 #define HELPINDENT (sizeof ("directory"))
423 
424 /*
425  * Help command.
426  * Call each command handler with argc == 0 and argv[0] == name.
427  */
428 help(argc, argv)
429 	int argc;
430 	char *argv[];
431 {
432 	extern struct cmd cmdtab[];
433 	register struct cmd *c;
434 
435 	if (argc == 1) {
436 		register int i, j, w, k;
437 		int columns, width = 0, lines;
438 		extern int NCMDS;
439 
440 		printf("Commands may be abbreviated.  Commands are:\n\n");
441 		for (c = cmdtab; c < &cmdtab[NCMDS]; c++) {
442 			int len = strlen(c->c_name);
443 
444 			if (len > width)
445 				width = len;
446 		}
447 		width = (width + 8) &~ 7;
448 		columns = 80 / width;
449 		if (columns == 0)
450 			columns = 1;
451 		lines = (NCMDS + columns - 1) / columns;
452 		for (i = 0; i < lines; i++) {
453 			for (j = 0; j < columns; j++) {
454 				c = cmdtab + j * lines + i;
455 				if (c->c_name && (!proxy || c->c_proxy)) {
456 					printf("%s", c->c_name);
457 				}
458 				else if (c->c_name) {
459 					for (k=0; k < strlen(c->c_name); k++) {
460 						(void) putchar(' ');
461 					}
462 				}
463 				if (c + lines >= &cmdtab[NCMDS]) {
464 					printf("\n");
465 					break;
466 				}
467 				w = strlen(c->c_name);
468 				while (w < width) {
469 					w = (w + 8) &~ 7;
470 					(void) putchar('\t');
471 				}
472 			}
473 		}
474 		return;
475 	}
476 	while (--argc > 0) {
477 		register char *arg;
478 		arg = *++argv;
479 		c = getcmd(arg);
480 		if (c == (struct cmd *)-1)
481 			printf("?Ambiguous help command %s\n", arg);
482 		else if (c == (struct cmd *)0)
483 			printf("?Invalid help command %s\n", arg);
484 		else
485 			printf("%-*s\t%s\n", HELPINDENT,
486 				c->c_name, c->c_help);
487 	}
488 }
489