Home | History | Annotate | Line # | Download | only in ftp
main.c revision 1.3 
      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 static char sccsid[] = "@(#)main.c	8.4 (Berkeley) 4/3/94";
     42 #endif /* not lint */
     43 
     44 /*
     45  * FTP User Program -- Command Interface.
     46  */
     47 /*#include <sys/ioctl.h>*/
     48 #include <sys/types.h>
     49 #include <sys/socket.h>
     50 
     51 #include <arpa/ftp.h>
     52 
     53 #include <ctype.h>
     54 #include <err.h>
     55 #include <netdb.h>
     56 #include <pwd.h>
     57 #include <signal.h>
     58 #include <stdio.h>
     59 #include <stdlib.h>
     60 #include <unistd.h>
     61 
     62 #include "ftp_var.h"
     63 
     64 int
     65 main(argc, argv)
     66 	int argc;
     67 	char *argv[];
     68 {
     69 	int ch, top;
     70 	struct passwd *pw = NULL;
     71 	char *cp, homedir[MAXPATHLEN];
     72 
     73 	sp = getservbyname("ftp", "tcp");
     74 	if (sp == 0)
     75 		errx(1, "ftp/tcp: unknown service");
     76 	doglob = 1;
     77 	interactive = 1;
     78 	autologin = 1;
     79 
     80 	while ((ch = getopt(argc, argv, "dgintv")) != EOF) {
     81 		switch (*cp) {
     82 		case 'd':
     83 			options |= SO_DEBUG;
     84 			debug++;
     85 			break;
     86 
     87 		case 'g':
     88 			doglob = 0;
     89 			break;
     90 
     91 		case 'i':
     92 			interactive = 0;
     93 			break;
     94 
     95 		case 'n':
     96 			autologin = 0;
     97 			break;
     98 
     99 		case 't':
    100 			trace++;
    101 			break;
    102 
    103 		case 'v':
    104 			verbose++;
    105 			break;
    106 
    107 		default:
    108 			(void)fprintf(stderr,
    109 				"usage: ftp [-dgintv] [host [port]]\n");
    110 			exit(1);
    111 		}
    112 	}
    113 	argc -= optind;
    114 	argv += optind;
    115 
    116 	fromatty = isatty(fileno(stdin));
    117 	if (fromatty)
    118 		verbose++;
    119 	cpend = 0;	/* no pending replies */
    120 	proxy = 0;	/* proxy not active */
    121 	crflag = 1;	/* strip c.r. on ascii gets */
    122 	sendport = -1;	/* not using ports */
    123 	/*
    124 	 * Set up the home directory in case we're globbing.
    125 	 */
    126 	cp = getlogin();
    127 	if (cp != NULL) {
    128 		pw = getpwnam(cp);
    129 	}
    130 	if (pw == NULL)
    131 		pw = getpwuid(getuid());
    132 	if (pw != NULL) {
    133 		home = homedir;
    134 		(void) strcpy(home, pw->pw_dir);
    135 	}
    136 	if (argc > 0) {
    137 		char *xargv[5];
    138 		extern char *__progname;
    139 
    140 		if (setjmp(toplevel))
    141 			exit(0);
    142 		(void) signal(SIGINT, intr);
    143 		(void) signal(SIGPIPE, lostpeer);
    144 		xargv[0] = __progname;
    145 		xargv[1] = argv[0];
    146 		xargv[2] = argv[1];
    147 		xargv[3] = argv[2];
    148 		xargv[4] = NULL;
    149 		setpeer(argc+1, xargv);
    150 	}
    151 	top = setjmp(toplevel) == 0;
    152 	if (top) {
    153 		(void) signal(SIGINT, intr);
    154 		(void) signal(SIGPIPE, lostpeer);
    155 	}
    156 	for (;;) {
    157 		cmdscanner(top);
    158 		top = 1;
    159 	}
    160 }
    161 
    162 void
    163 intr()
    164 {
    165 
    166 	longjmp(toplevel, 1);
    167 }
    168 
    169 void
    170 lostpeer()
    171 {
    172 
    173 	if (connected) {
    174 		if (cout != NULL) {
    175 			(void) shutdown(fileno(cout), 1+1);
    176 			(void) fclose(cout);
    177 			cout = NULL;
    178 		}
    179 		if (data >= 0) {
    180 			(void) shutdown(data, 1+1);
    181 			(void) close(data);
    182 			data = -1;
    183 		}
    184 		connected = 0;
    185 	}
    186 	pswitch(1);
    187 	if (connected) {
    188 		if (cout != NULL) {
    189 			(void) shutdown(fileno(cout), 1+1);
    190 			(void) fclose(cout);
    191 			cout = NULL;
    192 		}
    193 		connected = 0;
    194 	}
    195 	proxflag = 0;
    196 	pswitch(0);
    197 }
    198 
    199 /*
    200 char *
    201 tail(filename)
    202 	char *filename;
    203 {
    204 	char *s;
    205 
    206 	while (*filename) {
    207 		s = strrchr(filename, '/');
    208 		if (s == NULL)
    209 			break;
    210 		if (s[1])
    211 			return (s + 1);
    212 		*s = '\0';
    213 	}
    214 	return (filename);
    215 }
    216 */
    217 
    218 /*
    219  * Command parser.
    220  */
    221 void
    222 cmdscanner(top)
    223 	int top;
    224 {
    225 	struct cmd *c;
    226 	int l;
    227 
    228 	if (!top)
    229 		(void) putchar('\n');
    230 	for (;;) {
    231 		if (fromatty) {
    232 			printf("ftp> ");
    233 			(void) fflush(stdout);
    234 		}
    235 		if (fgets(line, sizeof line, stdin) == NULL)
    236 			quit(0, 0);
    237 		l = strlen(line);
    238 		if (l == 0)
    239 			break;
    240 		if (line[--l] == '\n') {
    241 			if (l == 0)
    242 				break;
    243 			line[l] = '\0';
    244 		} else if (l == sizeof(line) - 2) {
    245 			printf("sorry, input line too long\n");
    246 			while ((l = getchar()) != '\n' && l != EOF)
    247 				/* void */;
    248 			break;
    249 		} /* else it was a line without a newline */
    250 		makeargv();
    251 		if (margc == 0) {
    252 			continue;
    253 		}
    254 		c = getcmd(margv[0]);
    255 		if (c == (struct cmd *)-1) {
    256 			printf("?Ambiguous command\n");
    257 			continue;
    258 		}
    259 		if (c == 0) {
    260 			printf("?Invalid command\n");
    261 			continue;
    262 		}
    263 		if (c->c_conn && !connected) {
    264 			printf("Not connected.\n");
    265 			continue;
    266 		}
    267 		(*c->c_handler)(margc, margv);
    268 		if (bell && c->c_bell)
    269 			(void) putchar('\007');
    270 		if (c->c_handler != help)
    271 			break;
    272 	}
    273 	(void) signal(SIGINT, intr);
    274 	(void) signal(SIGPIPE, lostpeer);
    275 }
    276 
    277 struct cmd *
    278 getcmd(name)
    279 	char *name;
    280 {
    281 	char *p, *q;
    282 	struct cmd *c, *found;
    283 	int nmatches, longest;
    284 
    285 	longest = 0;
    286 	nmatches = 0;
    287 	found = 0;
    288 	for (c = cmdtab; p = c->c_name; c++) {
    289 		for (q = name; *q == *p++; q++)
    290 			if (*q == 0)		/* exact match? */
    291 				return (c);
    292 		if (!*q) {			/* the name was a prefix */
    293 			if (q - name > longest) {
    294 				longest = q - name;
    295 				nmatches = 1;
    296 				found = c;
    297 			} else if (q - name == longest)
    298 				nmatches++;
    299 		}
    300 	}
    301 	if (nmatches > 1)
    302 		return ((struct cmd *)-1);
    303 	return (found);
    304 }
    305 
    306 /*
    307  * Slice a string up into argc/argv.
    308  */
    309 
    310 int slrflag;
    311 
    312 void
    313 makeargv()
    314 {
    315 	char **argp;
    316 
    317 	margc = 0;
    318 	argp = margv;
    319 	stringbase = line;		/* scan from first of buffer */
    320 	argbase = argbuf;		/* store from first of buffer */
    321 	slrflag = 0;
    322 	while (*argp++ = slurpstring())
    323 		margc++;
    324 }
    325 
    326 /*
    327  * Parse string into argbuf;
    328  * implemented with FSM to
    329  * handle quoting and strings
    330  */
    331 char *
    332 slurpstring()
    333 {
    334 	int got_one = 0;
    335 	char *sb = stringbase;
    336 	char *ap = argbase;
    337 	char *tmp = argbase;		/* will return this if token found */
    338 
    339 	if (*sb == '!' || *sb == '$') {	/* recognize ! as a token for shell */
    340 		switch (slrflag) {	/* and $ as token for macro invoke */
    341 			case 0:
    342 				slrflag++;
    343 				stringbase++;
    344 				return ((*sb == '!') ? "!" : "$");
    345 				/* NOTREACHED */
    346 			case 1:
    347 				slrflag++;
    348 				altarg = stringbase;
    349 				break;
    350 			default:
    351 				break;
    352 		}
    353 	}
    354 
    355 S0:
    356 	switch (*sb) {
    357 
    358 	case '\0':
    359 		goto OUT;
    360 
    361 	case ' ':
    362 	case '\t':
    363 		sb++; goto S0;
    364 
    365 	default:
    366 		switch (slrflag) {
    367 			case 0:
    368 				slrflag++;
    369 				break;
    370 			case 1:
    371 				slrflag++;
    372 				altarg = sb;
    373 				break;
    374 			default:
    375 				break;
    376 		}
    377 		goto S1;
    378 	}
    379 
    380 S1:
    381 	switch (*sb) {
    382 
    383 	case ' ':
    384 	case '\t':
    385 	case '\0':
    386 		goto OUT;	/* end of token */
    387 
    388 	case '\\':
    389 		sb++; goto S2;	/* slurp next character */
    390 
    391 	case '"':
    392 		sb++; goto S3;	/* slurp quoted string */
    393 
    394 	default:
    395 		*ap++ = *sb++;	/* add character to token */
    396 		got_one = 1;
    397 		goto S1;
    398 	}
    399 
    400 S2:
    401 	switch (*sb) {
    402 
    403 	case '\0':
    404 		goto OUT;
    405 
    406 	default:
    407 		*ap++ = *sb++;
    408 		got_one = 1;
    409 		goto S1;
    410 	}
    411 
    412 S3:
    413 	switch (*sb) {
    414 
    415 	case '\0':
    416 		goto OUT;
    417 
    418 	case '"':
    419 		sb++; goto S1;
    420 
    421 	default:
    422 		*ap++ = *sb++;
    423 		got_one = 1;
    424 		goto S3;
    425 	}
    426 
    427 OUT:
    428 	if (got_one)
    429 		*ap++ = '\0';
    430 	argbase = ap;			/* update storage pointer */
    431 	stringbase = sb;		/* update scan pointer */
    432 	if (got_one) {
    433 		return (tmp);
    434 	}
    435 	switch (slrflag) {
    436 		case 0:
    437 			slrflag++;
    438 			break;
    439 		case 1:
    440 			slrflag++;
    441 			altarg = (char *) 0;
    442 			break;
    443 		default:
    444 			break;
    445 	}
    446 	return ((char *)0);
    447 }
    448 
    449 #define HELPINDENT ((int) sizeof ("directory"))
    450 
    451 /*
    452  * Help command.
    453  * Call each command handler with argc == 0 and argv[0] == name.
    454  */
    455 void
    456 help(argc, argv)
    457 	int argc;
    458 	char *argv[];
    459 {
    460 	struct cmd *c;
    461 
    462 	if (argc == 1) {
    463 		int i, j, w, k;
    464 		int columns, width = 0, lines;
    465 
    466 		printf("Commands may be abbreviated.  Commands are:\n\n");
    467 		for (c = cmdtab; c < &cmdtab[NCMDS]; c++) {
    468 			int len = strlen(c->c_name);
    469 
    470 			if (len > width)
    471 				width = len;
    472 		}
    473 		width = (width + 8) &~ 7;
    474 		columns = 80 / width;
    475 		if (columns == 0)
    476 			columns = 1;
    477 		lines = (NCMDS + columns - 1) / columns;
    478 		for (i = 0; i < lines; i++) {
    479 			for (j = 0; j < columns; j++) {
    480 				c = cmdtab + j * lines + i;
    481 				if (c->c_name && (!proxy || c->c_proxy)) {
    482 					printf("%s", c->c_name);
    483 				}
    484 				else if (c->c_name) {
    485 					for (k=0; k < strlen(c->c_name); k++) {
    486 						(void) putchar(' ');
    487 					}
    488 				}
    489 				if (c + lines >= &cmdtab[NCMDS]) {
    490 					printf("\n");
    491 					break;
    492 				}
    493 				w = strlen(c->c_name);
    494 				while (w < width) {
    495 					w = (w + 8) &~ 7;
    496 					(void) putchar('\t');
    497 				}
    498 			}
    499 		}
    500 		return;
    501 	}
    502 	while (--argc > 0) {
    503 		char *arg;
    504 		arg = *++argv;
    505 		c = getcmd(arg);
    506 		if (c == (struct cmd *)-1)
    507 			printf("?Ambiguous help command %s\n", arg);
    508 		else if (c == (struct cmd *)0)
    509 			printf("?Invalid help command %s\n", arg);
    510 		else
    511 			printf("%-*s\t%s\n", HELPINDENT,
    512 				c->c_name, c->c_help);
    513 	}
    514 }
    515