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main.c revision 1.10 
      1 /*
      2  * Copyright (c) 1985, 1989, 1993, 1994
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 static char copyright[] =
     36 "@(#) Copyright (c) 1985, 1989, 1993, 1994\n\
     37 	The Regents of the University of California.  All rights reserved.\n";
     38 #endif /* not lint */
     39 
     40 #ifndef lint
     41 #if 0
     42 static char sccsid[] = "@(#)main.c	8.6 (Berkeley) 10/9/94";
     43 #else
     44 static char rcsid[] = "$NetBSD: main.c,v 1.10 1995/09/15 00:32:33 pk Exp $";
     45 #endif
     46 #endif /* not lint */
     47 
     48 /*
     49  * FTP User Program -- Command Interface.
     50  */
     51 /*#include <sys/ioctl.h>*/
     52 #include <sys/types.h>
     53 #include <sys/socket.h>
     54 
     55 #include <arpa/ftp.h>
     56 
     57 #include <ctype.h>
     58 #include <err.h>
     59 #include <netdb.h>
     60 #include <pwd.h>
     61 #include <signal.h>
     62 #include <stdio.h>
     63 #include <stdlib.h>
     64 #include <string.h>
     65 #include <unistd.h>
     66 
     67 #include "ftp_var.h"
     68 
     69 int
     70 main(argc, argv)
     71 	int argc;
     72 	char *argv[];
     73 {
     74 	int ch, top;
     75 	struct passwd *pw = NULL;
     76 	char *cp, homedir[MAXPATHLEN];
     77 
     78 	sp = getservbyname("ftp", "tcp");
     79 	if (sp == 0)
     80 		errx(1, "ftp/tcp: unknown service");
     81 	doglob = 1;
     82 	interactive = 1;
     83 	autologin = 1;
     84 
     85 	while ((ch = getopt(argc, argv, "dgintv")) != EOF) {
     86 		switch (ch) {
     87 		case 'd':
     88 			options |= SO_DEBUG;
     89 			debug++;
     90 			break;
     91 
     92 		case 'g':
     93 			doglob = 0;
     94 			break;
     95 
     96 		case 'i':
     97 			interactive = 0;
     98 			break;
     99 
    100 		case 'n':
    101 			autologin = 0;
    102 			break;
    103 
    104 		case 't':
    105 			trace++;
    106 			break;
    107 
    108 		case 'v':
    109 			verbose++;
    110 			break;
    111 
    112 		default:
    113 			(void)fprintf(stderr,
    114 				"usage: ftp [-dgintv] [host [port]]\n");
    115 			exit(1);
    116 		}
    117 	}
    118 	argc -= optind;
    119 	argv += optind;
    120 
    121 	fromatty = isatty(fileno(stdin));
    122 	if (fromatty)
    123 		verbose++;
    124 	cpend = 0;	/* no pending replies */
    125 	proxy = 0;	/* proxy not active */
    126 	passivemode = 0; /* passive mode not active */
    127 	crflag = 1;	/* strip c.r. on ascii gets */
    128 	sendport = -1;	/* not using ports */
    129 	/*
    130 	 * Set up the home directory in case we're globbing.
    131 	 */
    132 	cp = getlogin();
    133 	if (cp != NULL) {
    134 		pw = getpwnam(cp);
    135 	}
    136 	if (pw == NULL)
    137 		pw = getpwuid(getuid());
    138 	if (pw != NULL) {
    139 		home = homedir;
    140 		(void) strcpy(home, pw->pw_dir);
    141 	}
    142 	if (argc > 0) {
    143 		char *xargv[5];
    144 		extern char *__progname;
    145 
    146 		if (setjmp(toplevel))
    147 			exit(0);
    148 		(void) signal(SIGINT, intr);
    149 		(void) signal(SIGPIPE, lostpeer);
    150 		xargv[0] = __progname;
    151 		xargv[1] = argv[0];
    152 		xargv[2] = argv[1];
    153 		xargv[3] = argv[2];
    154 		xargv[4] = NULL;
    155 		setpeer(argc+1, xargv);
    156 	}
    157 	top = setjmp(toplevel) == 0;
    158 	if (top) {
    159 		(void) signal(SIGINT, intr);
    160 		(void) signal(SIGPIPE, lostpeer);
    161 	}
    162 	for (;;) {
    163 		cmdscanner(top);
    164 		top = 1;
    165 	}
    166 }
    167 
    168 void
    169 intr()
    170 {
    171 
    172 	longjmp(toplevel, 1);
    173 }
    174 
    175 void
    176 lostpeer()
    177 {
    178 
    179 	if (connected) {
    180 		if (cout != NULL) {
    181 			(void) shutdown(fileno(cout), 1+1);
    182 			(void) fclose(cout);
    183 			cout = NULL;
    184 		}
    185 		if (data >= 0) {
    186 			(void) shutdown(data, 1+1);
    187 			(void) close(data);
    188 			data = -1;
    189 		}
    190 		connected = 0;
    191 	}
    192 	pswitch(1);
    193 	if (connected) {
    194 		if (cout != NULL) {
    195 			(void) shutdown(fileno(cout), 1+1);
    196 			(void) fclose(cout);
    197 			cout = NULL;
    198 		}
    199 		connected = 0;
    200 	}
    201 	proxflag = 0;
    202 	pswitch(0);
    203 }
    204 
    205 /*
    206 char *
    207 tail(filename)
    208 	char *filename;
    209 {
    210 	char *s;
    211 
    212 	while (*filename) {
    213 		s = strrchr(filename, '/');
    214 		if (s == NULL)
    215 			break;
    216 		if (s[1])
    217 			return (s + 1);
    218 		*s = '\0';
    219 	}
    220 	return (filename);
    221 }
    222 */
    223 
    224 /*
    225  * Command parser.
    226  */
    227 void
    228 cmdscanner(top)
    229 	int top;
    230 {
    231 	struct cmd *c;
    232 	int l;
    233 
    234 	if (!top)
    235 		(void) putchar('\n');
    236 	for (;;) {
    237 		if (fromatty) {
    238 			printf("ftp> ");
    239 			(void) fflush(stdout);
    240 		}
    241 		if (fgets(line, sizeof line, stdin) == NULL)
    242 			quit(0, 0);
    243 		l = strlen(line);
    244 		if (l == 0)
    245 			break;
    246 		if (line[--l] == '\n') {
    247 			if (l == 0)
    248 				break;
    249 			line[l] = '\0';
    250 		} else if (l == sizeof(line) - 2) {
    251 			printf("sorry, input line too long\n");
    252 			while ((l = getchar()) != '\n' && l != EOF)
    253 				/* void */;
    254 			break;
    255 		} /* else it was a line without a newline */
    256 		makeargv();
    257 		if (margc == 0) {
    258 			continue;
    259 		}
    260 		c = getcmd(margv[0]);
    261 		if (c == (struct cmd *)-1) {
    262 			printf("?Ambiguous command\n");
    263 			continue;
    264 		}
    265 		if (c == 0) {
    266 			printf("?Invalid command\n");
    267 			continue;
    268 		}
    269 		if (c->c_conn && !connected) {
    270 			printf("Not connected.\n");
    271 			continue;
    272 		}
    273 		(*c->c_handler)(margc, margv);
    274 		if (bell && c->c_bell)
    275 			(void) putchar('\007');
    276 		if (c->c_handler != help)
    277 			break;
    278 	}
    279 	(void) signal(SIGINT, intr);
    280 	(void) signal(SIGPIPE, lostpeer);
    281 }
    282 
    283 struct cmd *
    284 getcmd(name)
    285 	char *name;
    286 {
    287 	char *p, *q;
    288 	struct cmd *c, *found;
    289 	int nmatches, longest;
    290 
    291 	longest = 0;
    292 	nmatches = 0;
    293 	found = 0;
    294 	for (c = cmdtab; p = c->c_name; c++) {
    295 		for (q = name; *q == *p++; q++)
    296 			if (*q == 0)		/* exact match? */
    297 				return (c);
    298 		if (!*q) {			/* the name was a prefix */
    299 			if (q - name > longest) {
    300 				longest = q - name;
    301 				nmatches = 1;
    302 				found = c;
    303 			} else if (q - name == longest)
    304 				nmatches++;
    305 		}
    306 	}
    307 	if (nmatches > 1)
    308 		return ((struct cmd *)-1);
    309 	return (found);
    310 }
    311 
    312 /*
    313  * Slice a string up into argc/argv.
    314  */
    315 
    316 int slrflag;
    317 
    318 void
    319 makeargv()
    320 {
    321 	char **argp;
    322 
    323 	argp = margv;
    324 	stringbase = line;		/* scan from first of buffer */
    325 	argbase = argbuf;		/* store from first of buffer */
    326 	slrflag = 0;
    327 	for (margc = 0; ; margc++) {
    328 		/* Expand array if necessary */
    329 		if (margc == margvlen) {
    330 			margv = (margvlen == 0)
    331 				? (char **)malloc(20 * sizeof(char *))
    332 				: (char **)realloc(margv,
    333 					(margvlen + 20)*sizeof(char *));
    334 			if (margv == NULL)
    335 				errx(1, "cannot realloc argv array");
    336 			margvlen += 20;
    337 			argp = margv + margc;
    338 		}
    339 
    340 		if ((*argp++ = slurpstring()) == NULL)
    341 			break;
    342 	}
    343 
    344 }
    345 
    346 /*
    347  * Parse string into argbuf;
    348  * implemented with FSM to
    349  * handle quoting and strings
    350  */
    351 char *
    352 slurpstring()
    353 {
    354 	int got_one = 0;
    355 	char *sb = stringbase;
    356 	char *ap = argbase;
    357 	char *tmp = argbase;		/* will return this if token found */
    358 
    359 	if (*sb == '!' || *sb == '$') {	/* recognize ! as a token for shell */
    360 		switch (slrflag) {	/* and $ as token for macro invoke */
    361 			case 0:
    362 				slrflag++;
    363 				stringbase++;
    364 				return ((*sb == '!') ? "!" : "$");
    365 				/* NOTREACHED */
    366 			case 1:
    367 				slrflag++;
    368 				altarg = stringbase;
    369 				break;
    370 			default:
    371 				break;
    372 		}
    373 	}
    374 
    375 S0:
    376 	switch (*sb) {
    377 
    378 	case '\0':
    379 		goto OUT;
    380 
    381 	case ' ':
    382 	case '\t':
    383 		sb++; goto S0;
    384 
    385 	default:
    386 		switch (slrflag) {
    387 			case 0:
    388 				slrflag++;
    389 				break;
    390 			case 1:
    391 				slrflag++;
    392 				altarg = sb;
    393 				break;
    394 			default:
    395 				break;
    396 		}
    397 		goto S1;
    398 	}
    399 
    400 S1:
    401 	switch (*sb) {
    402 
    403 	case ' ':
    404 	case '\t':
    405 	case '\0':
    406 		goto OUT;	/* end of token */
    407 
    408 	case '\\':
    409 		sb++; goto S2;	/* slurp next character */
    410 
    411 	case '"':
    412 		sb++; goto S3;	/* slurp quoted string */
    413 
    414 	default:
    415 		*ap++ = *sb++;	/* add character to token */
    416 		got_one = 1;
    417 		goto S1;
    418 	}
    419 
    420 S2:
    421 	switch (*sb) {
    422 
    423 	case '\0':
    424 		goto OUT;
    425 
    426 	default:
    427 		*ap++ = *sb++;
    428 		got_one = 1;
    429 		goto S1;
    430 	}
    431 
    432 S3:
    433 	switch (*sb) {
    434 
    435 	case '\0':
    436 		goto OUT;
    437 
    438 	case '"':
    439 		sb++; goto S1;
    440 
    441 	default:
    442 		*ap++ = *sb++;
    443 		got_one = 1;
    444 		goto S3;
    445 	}
    446 
    447 OUT:
    448 	if (got_one)
    449 		*ap++ = '\0';
    450 	argbase = ap;			/* update storage pointer */
    451 	stringbase = sb;		/* update scan pointer */
    452 	if (got_one) {
    453 		return (tmp);
    454 	}
    455 	switch (slrflag) {
    456 		case 0:
    457 			slrflag++;
    458 			break;
    459 		case 1:
    460 			slrflag++;
    461 			altarg = (char *) 0;
    462 			break;
    463 		default:
    464 			break;
    465 	}
    466 	return ((char *)0);
    467 }
    468 
    469 #define HELPINDENT ((int) sizeof ("directory"))
    470 
    471 /*
    472  * Help command.
    473  * Call each command handler with argc == 0 and argv[0] == name.
    474  */
    475 void
    476 help(argc, argv)
    477 	int argc;
    478 	char *argv[];
    479 {
    480 	struct cmd *c;
    481 
    482 	if (argc == 1) {
    483 		int i, j, w, k;
    484 		int columns, width = 0, lines;
    485 
    486 		printf("Commands may be abbreviated.  Commands are:\n\n");
    487 		for (c = cmdtab; c < &cmdtab[NCMDS]; c++) {
    488 			int len = strlen(c->c_name);
    489 
    490 			if (len > width)
    491 				width = len;
    492 		}
    493 		width = (width + 8) &~ 7;
    494 		columns = 80 / width;
    495 		if (columns == 0)
    496 			columns = 1;
    497 		lines = (NCMDS + columns - 1) / columns;
    498 		for (i = 0; i < lines; i++) {
    499 			for (j = 0; j < columns; j++) {
    500 				c = cmdtab + j * lines + i;
    501 				if (c->c_name && (!proxy || c->c_proxy)) {
    502 					printf("%s", c->c_name);
    503 				}
    504 				else if (c->c_name) {
    505 					for (k=0; k < strlen(c->c_name); k++) {
    506 						(void) putchar(' ');
    507 					}
    508 				}
    509 				if (c + lines >= &cmdtab[NCMDS]) {
    510 					printf("\n");
    511 					break;
    512 				}
    513 				w = strlen(c->c_name);
    514 				while (w < width) {
    515 					w = (w + 8) &~ 7;
    516 					(void) putchar('\t');
    517 				}
    518 			}
    519 		}
    520 		return;
    521 	}
    522 	while (--argc > 0) {
    523 		char *arg;
    524 		arg = *++argv;
    525 		c = getcmd(arg);
    526 		if (c == (struct cmd *)-1)
    527 			printf("?Ambiguous help command %s\n", arg);
    528 		else if (c == (struct cmd *)0)
    529 			printf("?Invalid help command %s\n", arg);
    530 		else
    531 			printf("%-*s\t%s\n", HELPINDENT,
    532 				c->c_name, c->c_help);
    533 	}
    534 }
    535