xref: /freebsd/usr.bin/tftp/main.c (revision 2b15cb3d0922bd70ea592f0da9b4a5b167f4d53f) 
1 /*
2  * Copyright (c) 1983, 1993
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  * 4. Neither the name of the University nor the names of its contributors
14  *    may be used to endorse or promote products derived from this software
15  *    without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  */
29 
30 #ifndef lint
31 static const char copyright[] =
32 "@(#) Copyright (c) 1983, 1993\n\
33 	The Regents of the University of California.  All rights reserved.\n";
34 #endif
35 
36 #if 0
37 #ifndef lint
38 static char sccsid[] = "@(#)main.c	8.1 (Berkeley) 6/6/93";
39 #endif
40 #endif
41 
42 #include <sys/cdefs.h>
43 __FBSDID("$FreeBSD$");
44 
45 /* Many bug fixes are from Jim Guyton <guyton@rand-unix> */
46 
47 /*
48  * TFTP User Program -- Command Interface.
49  */
50 #include <sys/param.h>
51 #include <sys/types.h>
52 #include <sys/socket.h>
53 #include <sys/sysctl.h>
54 #include <sys/file.h>
55 #include <sys/stat.h>
56 
57 #include <netinet/in.h>
58 #include <arpa/inet.h>
59 #include <arpa/tftp.h>
60 
61 #include <ctype.h>
62 #include <err.h>
63 #include <histedit.h>
64 #include <netdb.h>
65 #include <setjmp.h>
66 #include <signal.h>
67 #include <stdio.h>
68 #include <stdlib.h>
69 #include <string.h>
70 #include <unistd.h>
71 
72 #include "tftp-utils.h"
73 #include "tftp-io.h"
74 #include "tftp-options.h"
75 #include "tftp.h"
76 
77 #define	MAXLINE		(2 * MAXPATHLEN)
78 #define	TIMEOUT		5		/* secs between rexmt's */
79 
80 typedef struct	sockaddr_storage peeraddr;
81 static int	connected;
82 static char	mode[32];
83 static jmp_buf	toplevel;
84 volatile int	txrx_error;
85 static int	peer;
86 
87 #define	MAX_MARGV	20
88 static int	margc;
89 static char	*margv[MAX_MARGV];
90 
91 int		verbose;
92 static char	*port = NULL;
93 
94 static void	get(int, char **);
95 static void	help(int, char **);
96 static void	intr(int);
97 static void	modecmd(int, char **);
98 static void	put(int, char **);
99 static void	quit(int, char **);
100 static void	setascii(int, char **);
101 static void	setbinary(int, char **);
102 static void	setpeer0(char *, const char *);
103 static void	setpeer(int, char **);
104 static void	settimeoutpacket(int, char **);
105 static void	settimeoutnetwork(int, char **);
106 static void	setdebug(int, char **);
107 static void	setverbose(int, char **);
108 static void	showstatus(int, char **);
109 static void	setblocksize(int, char **);
110 static void	setblocksize2(int, char **);
111 static void	setoptions(int, char **);
112 static void	setrollover(int, char **);
113 static void	setpacketdrop(int, char **);
114 
115 static void command(void) __dead2;
116 static const char *command_prompt(void);
117 
118 static void urihandling(char *URI);
119 static void getusage(char *);
120 static void makeargv(char *line);
121 static void putusage(char *);
122 static void settftpmode(const char *);
123 
124 static char	*tail(char *);
125 static struct	cmd *getcmd(char *);
126 
127 #define HELPINDENT (sizeof("connect"))
128 
129 struct cmd {
130 	const char	*name;
131 	void	(*handler)(int, char **);
132 	const char	*help;
133 };
134 
135 static struct cmd cmdtab[] = {
136 	{ "connect",	setpeer,	"connect to remote tftp"	},
137 	{ "mode",	modecmd,	"set file transfer mode"	},
138 	{ "put",	put,		"send file"			},
139 	{ "get",	get,		"receive file"			},
140 	{ "quit",	quit,		"exit tftp"			},
141 	{ "verbose",	setverbose,	"toggle verbose mode"		},
142 	{ "status",	showstatus,	"show current status"		},
143 	{ "binary",     setbinary,	"set mode to octet"		},
144 	{ "ascii",      setascii,	"set mode to netascii"		},
145 	{ "rexmt",	settimeoutpacket,
146 	  "set per-packet retransmission timeout[-]" },
147 	{ "timeout",	settimeoutnetwork,
148 	  "set total retransmission timeout" },
149 	{ "trace",	setdebug,	"enable 'debug packet'[-]"	},
150 	{ "debug",	setdebug,	"enable verbose output"		},
151 	{ "blocksize",	setblocksize,	"set blocksize[*]"		},
152 	{ "blocksize2",	setblocksize2,	"set blocksize as a power of 2[**]" },
153 	{ "rollover",	setrollover,	"rollover after 64K packets[**]" },
154 	{ "options",	setoptions,
155 	  "enable or disable RFC2347 style options" },
156 	{ "help",	help,		"print help information"	},
157 	{ "packetdrop",	setpacketdrop,	"artificial packetloss feature"	},
158 	{ "?",		help,		"print help information"	},
159 	{ NULL,		NULL,		NULL				}
160 };
161 
162 static struct	modes {
163 	const char *m_name;
164 	const char *m_mode;
165 } modes[] = {
166 	{ "ascii",	"netascii" },
167 	{ "netascii",	"netascii" },
168 	{ "binary",	"octet" },
169 	{ "image",	"octet" },
170 	{ "octet",	"octet" },
171 	{ NULL,		NULL }
172 };
173 
174 int
175 main(int argc, char *argv[])
176 {
177 
178 	acting_as_client = 1;
179 	peer = -1;
180 	strcpy(mode, "netascii");
181 	signal(SIGINT, intr);
182 	if (argc > 1) {
183 		if (setjmp(toplevel) != 0)
184 			exit(txrx_error);
185 
186 		if (strncmp(argv[1], "tftp://", 7) == 0) {
187 			urihandling(argv[1]);
188 			exit(txrx_error);
189 		}
190 
191 		setpeer(argc, argv);
192 	}
193 	if (setjmp(toplevel) != 0)
194 		(void)putchar('\n');
195 
196 	init_options();
197 	command();
198 }
199 
200 /*
201  * RFC3617 handling of TFTP URIs:
202  *
203  *    tftpURI         = "tftp://" host "/" file [ mode ]
204  *    mode            = ";"  "mode=" ( "netascii" / "octet" )
205  *    file            = *( unreserved / escaped )
206  *    host            = <as specified by RFC 2732>
207  *    unreserved      = <as specified in RFC 2396>
208  *    escaped         = <as specified in RFC 2396>
209  *
210  * We are cheating a little bit by allowing any mode as specified in the
211  * modes table defined earlier on in this file and mapping it on the real
212  * mode.
213  */
214 static void
215 urihandling(char *URI)
216 {
217 	char	uri[ARG_MAX];
218 	char	*host = NULL;
219 	char	*path = NULL;
220 	char	*opts = NULL;
221 	const char *tmode = "octet";
222 	char	*s;
223 	char	line[MAXLINE];
224 	int	i;
225 
226 	strncpy(uri, URI, ARG_MAX);
227 	host = uri + 7;
228 
229 	if ((s = strchr(host, '/')) == NULL) {
230 		fprintf(stderr,
231 		    "Invalid URI: Couldn't find / after hostname\n");
232 		exit(1);
233 	}
234 	*s = '\0';
235 	path = s + 1;
236 
237 	if ((s = strchr(path, ';')) != NULL) {
238 		*s = '\0';
239 		opts = s + 1;
240 
241 		if (strncmp(opts, "mode=", 5) == 0) {
242 			tmode = opts;
243 			tmode += 5;
244 
245 			for (i = 0; modes[i].m_name != NULL; i++) {
246 				if (strcmp(modes[i].m_name, tmode) == 0)
247 					break;
248 			}
249 			if (modes[i].m_name == NULL) {
250 				fprintf(stderr, "Invalid mode: '%s'\n", mode);
251 				exit(1);
252 			}
253 			settftpmode(modes[i].m_mode);
254 		}
255 	} else {
256 		settftpmode("octet");
257 	}
258 
259 	setpeer0(host, NULL);
260 
261 	sprintf(line, "get %s", path);
262 	makeargv(line);
263 	get(margc, margv);
264 }
265 
266 static char    hostname[MAXHOSTNAMELEN];
267 
268 static void
269 setpeer0(char *host, const char *lport)
270 {
271 	struct addrinfo hints, *res0, *res;
272 	int error;
273 	const char *cause = "unknown";
274 
275 	if (connected) {
276 		close(peer);
277 		peer = -1;
278 	}
279 	connected = 0;
280 
281 	memset(&hints, 0, sizeof(hints));
282 	hints.ai_family = PF_UNSPEC;
283 	hints.ai_socktype = SOCK_DGRAM;
284 	hints.ai_protocol = IPPROTO_UDP;
285 	hints.ai_flags = AI_CANONNAME;
286 	if (!lport)
287 		lport = "tftp";
288 	error = getaddrinfo(host, lport, &hints, &res0);
289 	if (error) {
290 		warnx("%s", gai_strerror(error));
291 		return;
292 	}
293 
294 	for (res = res0; res; res = res->ai_next) {
295 		if (res->ai_addrlen > sizeof(peeraddr))
296 			continue;
297 		peer = socket(res->ai_family, res->ai_socktype,
298 			res->ai_protocol);
299 		if (peer < 0) {
300 			cause = "socket";
301 			continue;
302 		}
303 
304 		memset(&peer_sock, 0, sizeof(peer_sock));
305 		peer_sock.ss_family = res->ai_family;
306 		peer_sock.ss_len = res->ai_addrlen;
307 		if (bind(peer, (struct sockaddr *)&peer_sock, peer_sock.ss_len) < 0) {
308 			cause = "bind";
309 			close(peer);
310 			peer = -1;
311 			continue;
312 		}
313 
314 		break;
315 	}
316 
317 	if (peer < 0)
318 		warn("%s", cause);
319 	else {
320 		/* res->ai_addr <= sizeof(peeraddr) is guaranteed */
321 		memcpy(&peer_sock, res->ai_addr, res->ai_addrlen);
322 		if (res->ai_canonname) {
323 			(void) strncpy(hostname, res->ai_canonname,
324 				sizeof(hostname));
325 		} else
326 			(void) strncpy(hostname, host, sizeof(hostname));
327 		hostname[sizeof(hostname)-1] = 0;
328 		connected = 1;
329 	}
330 
331 	freeaddrinfo(res0);
332 }
333 
334 static void
335 setpeer(int argc, char *argv[])
336 {
337 	char	line[MAXLINE];
338 
339 	if (argc < 2) {
340 		strcpy(line, "Connect ");
341 		printf("(to) ");
342 		fgets(&line[strlen(line)], sizeof line - strlen(line), stdin);
343 		makeargv(line);
344 		argc = margc;
345 		argv = margv;
346 	}
347 	if ((argc < 2) || (argc > 3)) {
348 		printf("usage: %s [host [port]]\n", argv[0]);
349 		return;
350 	}
351 	if (argc == 3) {
352 		port = argv[2];
353 		setpeer0(argv[1], argv[2]);
354 	} else
355 		setpeer0(argv[1], NULL);
356 }
357 
358 static void
359 modecmd(int argc, char *argv[])
360 {
361 	struct modes *p;
362 	const char *sep;
363 
364 	if (argc < 2) {
365 		printf("Using %s mode to transfer files.\n", mode);
366 		return;
367 	}
368 	if (argc == 2) {
369 		for (p = modes; p->m_name; p++)
370 			if (strcmp(argv[1], p->m_name) == 0)
371 				break;
372 		if (p->m_name) {
373 			settftpmode(p->m_mode);
374 			return;
375 		}
376 		printf("%s: unknown mode\n", argv[1]);
377 		/* drop through and print usage message */
378 	}
379 
380 	printf("usage: %s [", argv[0]);
381 	sep = " ";
382 	for (p = modes; p->m_name != NULL; p++) {
383 		printf("%s%s", sep, p->m_name);
384 		if (*sep == ' ')
385 			sep = " | ";
386 	}
387 	printf(" ]\n");
388 	return;
389 }
390 
391 static void
392 setbinary(int argc __unused, char *argv[] __unused)
393 {
394 
395 	settftpmode("octet");
396 }
397 
398 static void
399 setascii(int argc __unused, char *argv[] __unused)
400 {
401 
402 	settftpmode("netascii");
403 }
404 
405 static void
406 settftpmode(const char *newmode)
407 {
408 
409 	strcpy(mode, newmode);
410 	if (verbose)
411 		printf("mode set to %s\n", mode);
412 }
413 
414 
415 /*
416  * Send file(s).
417  */
418 static void
419 put(int argc, char *argv[])
420 {
421 	int	fd;
422 	int	n;
423 	char	*cp, *targ;
424 	char	line[MAXLINE];
425 	struct stat sb;
426 
427 	if (argc < 2) {
428 		strcpy(line, "send ");
429 		printf("(file) ");
430 		fgets(&line[strlen(line)], sizeof line - strlen(line), stdin);
431 		makeargv(line);
432 		argc = margc;
433 		argv = margv;
434 	}
435 	if (argc < 2) {
436 		putusage(argv[0]);
437 		return;
438 	}
439 	targ = argv[argc - 1];
440 	if (strrchr(argv[argc - 1], ':')) {
441 		char *lcp;
442 
443 		for (n = 1; n < argc - 1; n++)
444 			if (strchr(argv[n], ':')) {
445 				putusage(argv[0]);
446 				return;
447 			}
448 		lcp = argv[argc - 1];
449 		targ = strrchr(lcp, ':');
450 		*targ++ = 0;
451 		if (lcp[0] == '[' && lcp[strlen(lcp) - 1] == ']') {
452 			lcp[strlen(lcp) - 1] = '\0';
453 			lcp++;
454 		}
455 		setpeer0(lcp, NULL);
456 	}
457 	if (!connected) {
458 		printf("No target machine specified.\n");
459 		return;
460 	}
461 	if (argc < 4) {
462 		cp = argc == 2 ? tail(targ) : argv[1];
463 		fd = open(cp, O_RDONLY);
464 		if (fd < 0) {
465 			warn("%s", cp);
466 			return;
467 		}
468 
469 		stat(cp, &sb);
470 		asprintf(&options[OPT_TSIZE].o_request, "%ju", sb.st_size);
471 
472 		if (verbose)
473 			printf("putting %s to %s:%s [%s]\n",
474 			    cp, hostname, targ, mode);
475 		xmitfile(peer, port, fd, targ, mode);
476 		return;
477 	}
478 				/* this assumes the target is a directory */
479 				/* on a remote unix system.  hmmmm.  */
480 	cp = strchr(targ, '\0');
481 	*cp++ = '/';
482 	for (n = 1; n < argc - 1; n++) {
483 		strcpy(cp, tail(argv[n]));
484 		fd = open(argv[n], O_RDONLY);
485 		if (fd < 0) {
486 			warn("%s", argv[n]);
487 			continue;
488 		}
489 
490 		stat(cp, &sb);
491 		asprintf(&options[OPT_TSIZE].o_request, "%ju", sb.st_size);
492 
493 		if (verbose)
494 			printf("putting %s to %s:%s [%s]\n",
495 			    argv[n], hostname, targ, mode);
496 		xmitfile(peer, port, fd, targ, mode);
497 	}
498 }
499 
500 static void
501 putusage(char *s)
502 {
503 
504 	printf("usage: %s file [remotename]\n", s);
505 	printf("       %s file host:remotename\n", s);
506 	printf("       %s file1 file2 ... fileN [[host:]remote-directory]\n", s);
507 }
508 
509 /*
510  * Receive file(s).
511  */
512 static void
513 get(int argc, char *argv[])
514 {
515 	int fd;
516 	int n;
517 	char *cp;
518 	char *src;
519 	char	line[MAXLINE];
520 
521 	if (argc < 2) {
522 		strcpy(line, "get ");
523 		printf("(files) ");
524 		fgets(&line[strlen(line)], sizeof line - strlen(line), stdin);
525 		makeargv(line);
526 		argc = margc;
527 		argv = margv;
528 	}
529 	if (argc < 2) {
530 		getusage(argv[0]);
531 		return;
532 	}
533 	if (!connected) {
534 		for (n = 1; n < argc ; n++)
535 			if (strrchr(argv[n], ':') == 0) {
536 				printf("No remote host specified and "
537 				    "no host given for file '%s'\n", argv[n]);
538 				getusage(argv[0]);
539 				return;
540 			}
541 	}
542 	for (n = 1; n < argc ; n++) {
543 		src = strrchr(argv[n], ':');
544 		if (src == NULL)
545 			src = argv[n];
546 		else {
547 			char *lcp;
548 
549 			*src++ = 0;
550 			lcp = argv[n];
551 			if (lcp[0] == '[' && lcp[strlen(lcp) - 1] == ']') {
552 				lcp[strlen(lcp) - 1] = '\0';
553 				lcp++;
554 			}
555 			setpeer0(lcp, NULL);
556 			if (!connected)
557 				continue;
558 		}
559 		if (argc < 4) {
560 			cp = argc == 3 ? argv[2] : tail(src);
561 			fd = creat(cp, 0644);
562 			if (fd < 0) {
563 				warn("%s", cp);
564 				return;
565 			}
566 			if (verbose)
567 				printf("getting from %s:%s to %s [%s]\n",
568 				    hostname, src, cp, mode);
569 			recvfile(peer, port, fd, src, mode);
570 			break;
571 		}
572 		cp = tail(src);         /* new .. jdg */
573 		fd = creat(cp, 0644);
574 		if (fd < 0) {
575 			warn("%s", cp);
576 			continue;
577 		}
578 		if (verbose)
579 			printf("getting from %s:%s to %s [%s]\n",
580 			    hostname, src, cp, mode);
581 		recvfile(peer, port, fd, src, mode);
582 	}
583 }
584 
585 static void
586 getusage(char *s)
587 {
588 
589 	printf("usage: %s file [localname]\n", s);
590 	printf("       %s [host:]file [localname]\n", s);
591 	printf("       %s [host1:]file1 [host2:]file2 ... [hostN:]fileN\n", s);
592 }
593 
594 static void
595 settimeoutpacket(int argc, char *argv[])
596 {
597 	int t;
598 	char	line[MAXLINE];
599 
600 	if (argc < 2) {
601 		strcpy(line, "Packet timeout ");
602 		printf("(value) ");
603 		fgets(&line[strlen(line)], sizeof line - strlen(line), stdin);
604 		makeargv(line);
605 		argc = margc;
606 		argv = margv;
607 	}
608 	if (argc != 2) {
609 		printf("usage: %s value\n", argv[0]);
610 		return;
611 	}
612 	t = atoi(argv[1]);
613 	if (t < 0) {
614 		printf("%s: bad value\n", argv[1]);
615 		return;
616 	}
617 
618 	settimeouts(t, timeoutnetwork, maxtimeouts);
619 }
620 
621 static void
622 settimeoutnetwork(int argc, char *argv[])
623 {
624 	int t;
625 	char	line[MAXLINE];
626 
627 	if (argc < 2) {
628 		strcpy(line, "Network timeout ");
629 		printf("(value) ");
630 		fgets(&line[strlen(line)], sizeof line - strlen(line), stdin);
631 		makeargv(line);
632 		argc = margc;
633 		argv = margv;
634 	}
635 	if (argc != 2) {
636 		printf("usage: %s value\n", argv[0]);
637 		return;
638 	}
639 	t = atoi(argv[1]);
640 	if (t < 0) {
641 		printf("%s: bad value\n", argv[1]);
642 		return;
643 	}
644 
645 	settimeouts(timeoutpacket, t, maxtimeouts);
646 }
647 
648 static void
649 showstatus(int argc __unused, char *argv[] __unused)
650 {
651 
652 	printf("Remote host: %s\n",
653 	    connected ? hostname : "none specified yet");
654 	printf("RFC2347 Options support: %s\n",
655 	    options_rfc_enabled ? "enabled" : "disabled");
656 	printf("Non-RFC defined options support: %s\n",
657 	    options_extra_enabled ? "enabled" : "disabled");
658 	printf("Mode: %s\n", mode);
659 	printf("Verbose: %s\n", verbose ? "on" : "off");
660 	printf("Debug: %s\n", debug_show(debug));
661 	printf("Artificial packetloss: %d in 100 packets\n",
662 	    packetdroppercentage);
663 	printf("Segment size: %d bytes\n", segsize);
664 	printf("Network timeout: %d seconds\n", timeoutpacket);
665 	printf("Maximum network timeout: %d seconds\n", timeoutnetwork);
666 	printf("Maximum timeouts: %d \n", maxtimeouts);
667 }
668 
669 static void
670 intr(int dummy __unused)
671 {
672 
673 	signal(SIGALRM, SIG_IGN);
674 	alarm(0);
675 	longjmp(toplevel, -1);
676 }
677 
678 static char *
679 tail(char *filename)
680 {
681 	char *s;
682 
683 	while (*filename) {
684 		s = strrchr(filename, '/');
685 		if (s == NULL)
686 			break;
687 		if (s[1])
688 			return (s + 1);
689 		*s = '\0';
690 	}
691 	return (filename);
692 }
693 
694 static const char *
695 command_prompt(void)
696 {
697 
698 	return ("tftp> ");
699 }
700 
701 /*
702  * Command parser.
703  */
704 static void
705 command(void)
706 {
707 	HistEvent he;
708 	struct cmd *c;
709 	static EditLine *el;
710 	static History *hist;
711 	const char *bp;
712 	char *cp;
713 	int len, num, vrbose;
714 	char	line[MAXLINE];
715 
716 	vrbose = isatty(0);
717 	if (vrbose) {
718 		el = el_init("tftp", stdin, stdout, stderr);
719 		hist = history_init();
720 		history(hist, &he, H_SETSIZE, 100);
721 		el_set(el, EL_HIST, history, hist);
722 		el_set(el, EL_EDITOR, "emacs");
723 		el_set(el, EL_PROMPT, command_prompt);
724 		el_set(el, EL_SIGNAL, 1);
725 		el_source(el, NULL);
726 	}
727 	for (;;) {
728 		if (vrbose) {
729                         if ((bp = el_gets(el, &num)) == NULL || num == 0)
730                                 exit(0);
731                         len = (num > MAXLINE) ? MAXLINE : num;
732                         memcpy(line, bp, len);
733                         line[len] = '\0';
734                         history(hist, &he, H_ENTER, bp);
735 		} else {
736 			line[0] = 0;
737 			if (fgets(line, sizeof line , stdin) == NULL) {
738 				if (feof(stdin)) {
739 					exit(txrx_error);
740 				} else {
741 					continue;
742 				}
743 			}
744 		}
745 		if ((cp = strchr(line, '\n')))
746 			*cp = '\0';
747 		if (line[0] == 0)
748 			continue;
749 		makeargv(line);
750 		if (margc == 0)
751 			continue;
752 		c = getcmd(margv[0]);
753 		if (c == (struct cmd *)-1) {
754 			printf("?Ambiguous command\n");
755 			continue;
756 		}
757 		if (c == 0) {
758 			printf("?Invalid command\n");
759 			continue;
760 		}
761 		(*c->handler)(margc, margv);
762 	}
763 }
764 
765 static struct cmd *
766 getcmd(char *name)
767 {
768 	const char *p, *q;
769 	struct cmd *c, *found;
770 	int nmatches, longest;
771 
772 	longest = 0;
773 	nmatches = 0;
774 	found = 0;
775 	for (c = cmdtab; (p = c->name) != NULL; c++) {
776 		for (q = name; *q == *p++; q++)
777 			if (*q == 0)		/* exact match? */
778 				return (c);
779 		if (!*q) {			/* the name was a prefix */
780 			if (q - name > longest) {
781 				longest = q - name;
782 				nmatches = 1;
783 				found = c;
784 			} else if (q - name == longest)
785 				nmatches++;
786 		}
787 	}
788 	if (nmatches > 1)
789 		return ((struct cmd *)-1);
790 	return (found);
791 }
792 
793 /*
794  * Slice a string up into argc/argv.
795  */
796 static void
797 makeargv(char *line)
798 {
799 	char *cp;
800 	char **argp = margv;
801 
802 	margc = 0;
803 	if ((cp = strchr(line, '\n')) != NULL)
804 		*cp = '\0';
805 	for (cp = line; margc < MAX_MARGV - 1 && *cp != '\0';) {
806 		while (isspace(*cp))
807 			cp++;
808 		if (*cp == '\0')
809 			break;
810 		*argp++ = cp;
811 		margc += 1;
812 		while (*cp != '\0' && !isspace(*cp))
813 			cp++;
814 		if (*cp == '\0')
815 			break;
816 		*cp++ = '\0';
817 	}
818 	*argp++ = 0;
819 }
820 
821 static void
822 quit(int argc __unused, char *argv[] __unused)
823 {
824 
825 	exit(txrx_error);
826 }
827 
828 /*
829  * Help command.
830  */
831 static void
832 help(int argc, char *argv[])
833 {
834 	struct cmd *c;
835 
836 	if (argc == 1) {
837 		printf("Commands may be abbreviated.  Commands are:\n\n");
838 		for (c = cmdtab; c->name; c++)
839 			printf("%-*s\t%s\n", (int)HELPINDENT, c->name, c->help);
840 
841 		printf("\n[-] : You shouldn't use these ones anymore.\n");
842 		printf("[*] : RFC2347 options support required.\n");
843 		printf("[**] : Non-standard RFC2347 option.\n");
844 		return;
845 	}
846 	while (--argc > 0) {
847 		char *arg;
848 		arg = *++argv;
849 		c = getcmd(arg);
850 		if (c == (struct cmd *)-1)
851 			printf("?Ambiguous help command: %s\n", arg);
852 		else if (c == (struct cmd *)0)
853 			printf("?Invalid help command: %s\n", arg);
854 		else
855 			printf("%s\n", c->help);
856 	}
857 }
858 
859 static void
860 setverbose(int argc __unused, char *argv[] __unused)
861 {
862 
863 	verbose = !verbose;
864 	printf("Verbose mode %s.\n", verbose ? "on" : "off");
865 }
866 
867 static void
868 setoptions(int argc, char *argv[])
869 {
870 
871 	if (argc == 2) {
872 		if (strcasecmp(argv[1], "enable") == 0 ||
873 		    strcasecmp(argv[1], "on") == 0) {
874 			options_extra_enabled = 1;
875 			options_rfc_enabled = 1;
876 		}
877 		if (strcasecmp(argv[1], "disable") == 0 ||
878 		    strcasecmp(argv[1], "off") == 0) {
879 			options_extra_enabled = 0;
880 			options_rfc_enabled = 0;
881 		}
882 		if (strcasecmp(argv[1], "extra") == 0)
883 			options_extra_enabled = !options_extra_enabled;
884 	}
885 	printf("Support for RFC2347 style options are now %s.\n",
886 	    options_rfc_enabled ? "enabled" : "disabled");
887 	printf("Support for non-RFC defined options are now %s.\n",
888 	    options_extra_enabled ? "enabled" : "disabled");
889 
890 	printf("\nThe following options are available:\n"
891 	    "\toptions on	: enable support for RFC2347 style options\n"
892 	    "\toptions off	: disable support for RFC2347 style options\n"
893 	    "\toptions extra	: toggle support for non-RFC defined options\n"
894 	);
895 }
896 
897 static void
898 setrollover(int argc, char *argv[])
899 {
900 
901 	if (argc == 2) {
902 		if (strcasecmp(argv[1], "never") == 0 ||
903 		    strcasecmp(argv[1], "none") == 0) {
904 			free(options[OPT_ROLLOVER].o_request);
905 			options[OPT_ROLLOVER].o_request = NULL;
906 		}
907 		if (strcasecmp(argv[1], "1") == 0) {
908 			free(options[OPT_ROLLOVER].o_request);
909 			options[OPT_ROLLOVER].o_request = strdup("1");
910 		}
911 		if (strcasecmp(argv[1], "0") == 0) {
912 			free(options[OPT_ROLLOVER].o_request);
913 			options[OPT_ROLLOVER].o_request = strdup("0");
914 		}
915 	}
916 	printf("Support for the rollover options is %s.\n",
917 	    options[OPT_ROLLOVER].o_request != NULL ? "enabled" : "disabled");
918 	if (options[OPT_ROLLOVER].o_request != NULL)
919 		printf("Block rollover will be to block %s.\n",
920 		    options[OPT_ROLLOVER].o_request);
921 
922 
923 	printf("\nThe following rollover options are available:\n"
924 	    "\trollover 0	: rollover to block zero (default)\n"
925 	    "\trollover 1	: rollover to block one\n"
926 	    "\trollover never	: do not support the rollover option\n"
927 	    "\trollover none	: do not support the rollover option\n"
928 	);
929 }
930 
931 static void
932 setdebug(int argc, char *argv[])
933 {
934 	int i;
935 
936 	if (argc != 1) {
937 		i = 1;
938 		while (i < argc)
939 			debug ^= debug_find(argv[i++]);
940 	}
941 	printf("The following debugging is enabled: %s\n", debug_show(debug));
942 
943 	printf("\nThe following debugs are available:\n");
944 	i = 0;
945 	while (debugs[i].name != NULL) {
946 		printf("\t%s\t%s\n", debugs[i].name, debugs[i].desc);
947 		i++;
948 	}
949 }
950 
951 static void
952 setblocksize(int argc, char *argv[])
953 {
954 
955 	if (!options_rfc_enabled)
956 		printf("RFC2347 style options are not enabled "
957 		    "(but proceeding anyway)\n");
958 
959 	if (argc != 1) {
960 		int size = atoi(argv[1]);
961 		size_t max;
962 		u_long maxdgram;
963 
964 		max = sizeof(maxdgram);
965 		if (sysctlbyname("net.inet.udp.maxdgram",
966 			&maxdgram, &max, NULL, 0) < 0) {
967 			perror("sysctl: net.inet.udp.maxdgram");
968 			return;
969 		}
970 
971 		if (size < BLKSIZE_MIN || size > BLKSIZE_MAX) {
972 			printf("Blocksize should be between %d and %d bytes.\n",
973 				BLKSIZE_MIN, BLKSIZE_MAX);
974 			return;
975 		} else if (size > (int)maxdgram - 4) {
976 			printf("Blocksize can't be bigger than %ld bytes due "
977 			    "to the net.inet.udp.maxdgram sysctl limitation.\n",
978 			    maxdgram - 4);
979 			asprintf(&options[OPT_BLKSIZE].o_request,
980 			    "%ld", maxdgram - 4);
981 		} else {
982 			asprintf(&options[OPT_BLKSIZE].o_request, "%d", size);
983 		}
984 	}
985 	printf("Blocksize is now %s bytes.\n", options[OPT_BLKSIZE].o_request);
986 }
987 
988 static void
989 setblocksize2(int argc, char *argv[])
990 {
991 
992 	if (!options_rfc_enabled || !options_extra_enabled)
993 		printf(
994 		    "RFC2347 style or non-RFC defined options are not enabled "
995 		    "(but proceeding anyway)\n");
996 
997 	if (argc != 1) {
998 		int size = atoi(argv[1]);
999 		int i;
1000 		size_t max;
1001 		u_long maxdgram;
1002 
1003 		int sizes[] = {
1004 			8, 16, 32, 64, 128, 256, 512, 1024,
1005 			2048, 4096, 8192, 16384, 32768, 0
1006 		};
1007 
1008 		max = sizeof(maxdgram);
1009 		if (sysctlbyname("net.inet.udp.maxdgram",
1010 			&maxdgram, &max, NULL, 0) < 0) {
1011 			perror("sysctl: net.inet.udp.maxdgram");
1012 			return;
1013 		}
1014 
1015 		for (i = 0; sizes[i] != 0; i++) {
1016 			if (sizes[i] == size) break;
1017 		}
1018 		if (sizes[i] == 0) {
1019 			printf("Blocksize2 should be a power of two between "
1020 			    "8 and 32768.\n");
1021 			return;
1022 		}
1023 
1024 		if (size < BLKSIZE_MIN || size > BLKSIZE_MAX) {
1025 			printf("Blocksize2 should be between "
1026 			    "%d and %d bytes.\n", BLKSIZE_MIN, BLKSIZE_MAX);
1027 			return;
1028 		} else if (size > (int)maxdgram - 4) {
1029 			printf("Blocksize2 can't be bigger than %ld bytes due "
1030 			    "to the net.inet.udp.maxdgram sysctl limitation.\n",
1031 			    maxdgram - 4);
1032 			for (i = 0; sizes[i+1] != 0; i++) {
1033 				if ((int)maxdgram < sizes[i+1]) break;
1034 			}
1035 			asprintf(&options[OPT_BLKSIZE2].o_request,
1036 			    "%d", sizes[i]);
1037 		} else {
1038 			asprintf(&options[OPT_BLKSIZE2].o_request, "%d", size);
1039 		}
1040 	}
1041 	printf("Blocksize2 is now %s bytes.\n",
1042 	    options[OPT_BLKSIZE2].o_request);
1043 }
1044 
1045 static void
1046 setpacketdrop(int argc, char *argv[])
1047 {
1048 
1049 	if (argc != 1)
1050 		packetdroppercentage = atoi(argv[1]);
1051 
1052 	printf("Randomly %d in 100 packets will be dropped\n",
1053 	    packetdroppercentage);
1054 }
1055