main.c revision 216370 
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
31static 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
38static char sccsid[] = "@(#)main.c	8.1 (Berkeley) 6/6/93";
39#endif
40#endif
41
42#include <sys/cdefs.h>
43__FBSDID("$FreeBSD: head/usr.bin/tftp/main.c 216370 2010-12-11 08:32:16Z joel $");
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/param.h>
56#include <sys/stat.h>
57
58#include <netinet/in.h>
59#include <arpa/inet.h>
60#include <arpa/tftp.h>
61
62#include <ctype.h>
63#include <err.h>
64#include <histedit.h>
65#include <netdb.h>
66#include <setjmp.h>
67#include <signal.h>
68#include <stdio.h>
69#include <stdlib.h>
70#include <string.h>
71#include <unistd.h>
72
73#include "tftp-utils.h"
74#include "tftp-io.h"
75#include "tftp-options.h"
76#include "tftp.h"
77
78#define	MAXLINE		200
79#define	TIMEOUT		5		/* secs between rexmt's */
80
81static struct	sockaddr_storage peeraddr;
82static int	connected;
83static char	mode[32];
84jmp_buf		toplevel;
85volatile int	txrx_error;
86static int	peer;
87
88#define	MAX_MARGV	20
89static int	margc;
90static char	*margv[MAX_MARGV];
91
92int		verbose;
93char		*port = NULL;
94
95static void	get(int, char **);
96static void	help(int, char **);
97static void	intr(int);
98static void	modecmd(int, char **);
99static void	put(int, char **);
100static void	quit(int, char **);
101static void	setascii(int, char **);
102static void	setbinary(int, char **);
103static void	setpeer0(char *, const char *);
104static void	setpeer(int, char **);
105static void	settimeoutpacket(int, char **);
106static void	settimeoutnetwork(int, char **);
107static void	setdebug(int, char **);
108static void	setverbose(int, char **);
109static void	showstatus(int, char **);
110static void	setblocksize(int, char **);
111static void	setblocksize2(int, char **);
112static void	setoptions(int, char **);
113static void	setrollover(int, char **);
114static void	setpacketdrop(int, char **);
115
116static void command(void) __dead2;
117static const char *command_prompt(void);
118
119static void urihandling(char *URI);
120static void getusage(char *);
121static void makeargv(char *line);
122static void putusage(char *);
123static void settftpmode(const char *);
124
125static char	*tail(char *);
126static struct	cmd *getcmd(char *);
127
128#define HELPINDENT (sizeof("connect"))
129
130struct cmd {
131	const char	*name;
132	void	(*handler)(int, char **);
133	const char	*help;
134};
135
136static struct cmd cmdtab[] = {
137	{ "connect",	setpeer,	"connect to remote tftp"	},
138	{ "mode",	modecmd,	"set file transfer mode"	},
139	{ "put",	put,		"send file"			},
140	{ "get",	get,		"receive file"			},
141	{ "quit",	quit,		"exit tftp"			},
142	{ "verbose",	setverbose,	"toggle verbose mode"		},
143	{ "status",	showstatus,	"show current status"		},
144	{ "binary",     setbinary,	"set mode to octet"		},
145	{ "ascii",      setascii,	"set mode to netascii"		},
146	{ "rexmt",	settimeoutpacket,
147	  "set per-packet retransmission timeout[-]" },
148	{ "timeout",	settimeoutnetwork,
149	  "set total retransmission timeout" },
150	{ "trace",	setdebug,	"enable 'debug packet'[-]"	},
151	{ "debug",	setdebug,	"enable verbose output"		},
152	{ "blocksize",	setblocksize,	"set blocksize[*]"		},
153	{ "blocksize2",	setblocksize2,	"set blocksize as a power of 2[**]" },
154	{ "rollover",	setrollover,	"rollover after 64K packets[**]" },
155	{ "options",	setoptions,
156	  "enable or disable RFC2347 style options" },
157	{ "help",	help,		"print help information"	},
158	{ "packetdrop",	setpacketdrop,	"artifical packetloss feature"	},
159	{ "?",		help,		"print help information"	},
160	{ NULL,		NULL,		NULL				}
161};
162
163static struct	modes {
164	const char *m_name;
165	const char *m_mode;
166} modes[] = {
167	{ "ascii",	"netascii" },
168	{ "netascii",	"netascii" },
169	{ "binary",	"octet" },
170	{ "image",	"octet" },
171	{ "octet",	"octet" },
172	{ NULL,		NULL }
173};
174
175int
176main(int argc, char *argv[])
177{
178
179	acting_as_client = 1;
180	peer = -1;
181	strcpy(mode, "netascii");
182	signal(SIGINT, intr);
183	if (argc > 1) {
184		if (setjmp(toplevel) != 0)
185			exit(txrx_error);
186
187		if (strncmp(argv[1], "tftp://", 7) == 0) {
188			urihandling(argv[1]);
189			exit(txrx_error);
190		}
191
192		setpeer(argc, argv);
193	}
194	if (setjmp(toplevel) != 0)
195		(void)putchar('\n');
196
197	init_options();
198	command();
199}
200
201/*
202 * RFC3617 handling of TFTP URIs:
203 *
204 *    tftpURI         = "tftp://" host "/" file [ mode ]
205 *    mode            = ";"  "mode=" ( "netascii" / "octet" )
206 *    file            = *( unreserved / escaped )
207 *    host            = <as specified by RFC 2732>
208 *    unreserved      = <as specified in RFC 2396>
209 *    escaped         = <as specified in RFC 2396>
210 *
211 * We are cheating a little bit by allowing any mode as specified in the
212 * modes table defined earlier on in this file and mapping it on the real
213 * mode.
214 */
215static void
216urihandling(char *URI)
217{
218	char	uri[ARG_MAX];
219	char	*host = NULL;
220	char	*path = NULL;
221	char	*opts = NULL;
222	const char *tmode = "octet";
223	char	*s;
224	char	line[MAXLINE];
225	int	i;
226
227	strncpy(uri, URI, ARG_MAX);
228	host = uri + 7;
229
230	if ((s = strchr(host, '/')) == NULL) {
231		fprintf(stderr,
232		    "Invalid URI: Couldn't find / after hostname\n");
233		exit(1);
234	}
235	*s = '\0';
236	path = s + 1;
237
238	if ((s = strchr(path, ';')) != NULL) {
239		*s = '\0';
240		opts = s + 1;
241
242		if (strncmp(opts, "mode=", 5) == 0) {
243			tmode = opts;
244			tmode += 5;
245
246			for (i = 0; modes[i].m_name != NULL; i++) {
247				if (strcmp(modes[i].m_name, tmode) == 0)
248					break;
249			}
250			if (modes[i].m_name == NULL) {
251				fprintf(stderr, "Invalid mode: '%s'\n", mode);
252				exit(1);
253			}
254			settftpmode(modes[i].m_mode);
255		}
256	} else {
257		settftpmode("octet");
258	}
259
260	setpeer0(host, NULL);
261
262	sprintf(line, "get %s", path);
263	makeargv(line);
264	get(margc, margv);
265}
266
267static char    hostname[MAXHOSTNAMELEN];
268
269static void
270setpeer0(char *host, const char *lport)
271{
272	struct addrinfo hints, *res0, *res;
273	int error;
274	const char *cause = "unknown";
275
276	if (connected) {
277		close(peer);
278		peer = -1;
279	}
280	connected = 0;
281
282	memset(&hints, 0, sizeof(hints));
283	hints.ai_family = PF_UNSPEC;
284	hints.ai_socktype = SOCK_DGRAM;
285	hints.ai_protocol = IPPROTO_UDP;
286	hints.ai_flags = AI_CANONNAME;
287	if (!lport)
288		lport = "tftp";
289	error = getaddrinfo(host, lport, &hints, &res0);
290	if (error) {
291		warnx("%s", gai_strerror(error));
292		return;
293	}
294
295	for (res = res0; res; res = res->ai_next) {
296		if (res->ai_addrlen > sizeof(peeraddr))
297			continue;
298		peer = socket(res->ai_family, res->ai_socktype,
299			res->ai_protocol);
300		if (peer < 0) {
301			cause = "socket";
302			continue;
303		}
304
305		memset(&peer_sock, 0, sizeof(peer_sock));
306		peer_sock.ss_family = res->ai_family;
307		peer_sock.ss_len = res->ai_addrlen;
308		if (bind(peer, (struct sockaddr *)&peer_sock, peer_sock.ss_len) < 0) {
309			cause = "bind";
310			close(peer);
311			peer = -1;
312			continue;
313		}
314
315		break;
316	}
317
318	if (peer < 0)
319		warn("%s", cause);
320	else {
321		/* res->ai_addr <= sizeof(peeraddr) is guaranteed */
322		memcpy(&peer_sock, res->ai_addr, res->ai_addrlen);
323		if (res->ai_canonname) {
324			(void) strncpy(hostname, res->ai_canonname,
325				sizeof(hostname));
326		} else
327			(void) strncpy(hostname, host, sizeof(hostname));
328		hostname[sizeof(hostname)-1] = 0;
329		connected = 1;
330	}
331
332	freeaddrinfo(res0);
333}
334
335static void
336setpeer(int argc, char *argv[])
337{
338	char	line[MAXLINE];
339
340	if (argc < 2) {
341		strcpy(line, "Connect ");
342		printf("(to) ");
343		fgets(&line[strlen(line)], sizeof line - strlen(line), stdin);
344		makeargv(line);
345		argc = margc;
346		argv = margv;
347	}
348	if ((argc < 2) || (argc > 3)) {
349		printf("usage: %s [host [port]]\n", argv[0]);
350		return;
351	}
352	if (argc == 3) {
353		port = argv[2];
354		setpeer0(argv[1], argv[2]);
355	} else
356		setpeer0(argv[1], NULL);
357}
358
359static void
360modecmd(int argc, char *argv[])
361{
362	struct modes *p;
363	const char *sep;
364
365	if (argc < 2) {
366		printf("Using %s mode to transfer files.\n", mode);
367		return;
368	}
369	if (argc == 2) {
370		for (p = modes; p->m_name; p++)
371			if (strcmp(argv[1], p->m_name) == 0)
372				break;
373		if (p->m_name) {
374			settftpmode(p->m_mode);
375			return;
376		}
377		printf("%s: unknown mode\n", argv[1]);
378		/* drop through and print usage message */
379	}
380
381	printf("usage: %s [", argv[0]);
382	sep = " ";
383	for (p = modes; p->m_name != NULL; p++) {
384		printf("%s%s", sep, p->m_name);
385		if (*sep == ' ')
386			sep = " | ";
387	}
388	printf(" ]\n");
389	return;
390}
391
392static void
393setbinary(int argc __unused, char *argv[] __unused)
394{
395
396	settftpmode("octet");
397}
398
399static void
400setascii(int argc __unused, char *argv[] __unused)
401{
402
403	settftpmode("netascii");
404}
405
406static void
407settftpmode(const char *newmode)
408{
409
410	strcpy(mode, newmode);
411	if (verbose)
412		printf("mode set to %s\n", mode);
413}
414
415
416/*
417 * Send file(s).
418 */
419static void
420put(int argc, char *argv[])
421{
422	int	fd;
423	int	n;
424	char	*cp, *targ;
425	char	line[MAXLINE];
426	struct stat sb;
427
428	if (argc < 2) {
429		strcpy(line, "send ");
430		printf("(file) ");
431		fgets(&line[strlen(line)], sizeof line - strlen(line), stdin);
432		makeargv(line);
433		argc = margc;
434		argv = margv;
435	}
436	if (argc < 2) {
437		putusage(argv[0]);
438		return;
439	}
440	targ = argv[argc - 1];
441	if (rindex(argv[argc - 1], ':')) {
442		char *lcp;
443
444		for (n = 1; n < argc - 1; n++)
445			if (index(argv[n], ':')) {
446				putusage(argv[0]);
447				return;
448			}
449		lcp = argv[argc - 1];
450		targ = rindex(lcp, ':');
451		*targ++ = 0;
452		if (lcp[0] == '[' && lcp[strlen(lcp) - 1] == ']') {
453			lcp[strlen(lcp) - 1] = '\0';
454			lcp++;
455		}
456		setpeer0(lcp, NULL);
457	}
458	if (!connected) {
459		printf("No target machine specified.\n");
460		return;
461	}
462	if (argc < 4) {
463		cp = argc == 2 ? tail(targ) : argv[1];
464		fd = open(cp, O_RDONLY);
465		if (fd < 0) {
466			warn("%s", cp);
467			return;
468		}
469
470		stat(cp, &sb);
471		asprintf(&options[OPT_TSIZE].o_request, "%ju", sb.st_size);
472
473		if (verbose)
474			printf("putting %s to %s:%s [%s]\n",
475			    cp, hostname, targ, mode);
476		xmitfile(peer, port, fd, targ, mode);
477		return;
478	}
479				/* this assumes the target is a directory */
480				/* on a remote unix system.  hmmmm.  */
481	cp = index(targ, '\0');
482	*cp++ = '/';
483	for (n = 1; n < argc - 1; n++) {
484		strcpy(cp, tail(argv[n]));
485		fd = open(argv[n], O_RDONLY);
486		if (fd < 0) {
487			warn("%s", argv[n]);
488			continue;
489		}
490
491		stat(cp, &sb);
492		asprintf(&options[OPT_TSIZE].o_request, "%ju", sb.st_size);
493
494		if (verbose)
495			printf("putting %s to %s:%s [%s]\n",
496			    argv[n], hostname, targ, mode);
497		xmitfile(peer, port, fd, targ, mode);
498	}
499}
500
501static void
502putusage(char *s)
503{
504
505	printf("usage: %s file [remotename]\n", s);
506	printf("       %s file host:remotename\n", s);
507	printf("       %s file1 file2 ... fileN [[host:]remote-directory]\n", s);
508}
509
510/*
511 * Receive file(s).
512 */
513static void
514get(int argc, char *argv[])
515{
516	int fd;
517	int n;
518	char *cp;
519	char *src;
520	char	line[MAXLINE];
521
522	if (argc < 2) {
523		strcpy(line, "get ");
524		printf("(files) ");
525		fgets(&line[strlen(line)], sizeof line - strlen(line), stdin);
526		makeargv(line);
527		argc = margc;
528		argv = margv;
529	}
530	if (argc < 2) {
531		getusage(argv[0]);
532		return;
533	}
534	if (!connected) {
535		for (n = 1; n < argc ; n++)
536			if (rindex(argv[n], ':') == 0) {
537				printf("No remote host specified and "
538				    "no host given for file '%s'\n", argv[n]);
539				getusage(argv[0]);
540				return;
541			}
542	}
543	for (n = 1; n < argc ; n++) {
544		src = rindex(argv[n], ':');
545		if (src == NULL)
546			src = argv[n];
547		else {
548			char *lcp;
549
550			*src++ = 0;
551			lcp = argv[n];
552			if (lcp[0] == '[' && lcp[strlen(lcp) - 1] == ']') {
553				lcp[strlen(lcp) - 1] = '\0';
554				lcp++;
555			}
556			setpeer0(lcp, NULL);
557			if (!connected)
558				continue;
559		}
560		if (argc < 4) {
561			cp = argc == 3 ? argv[2] : tail(src);
562			fd = creat(cp, 0644);
563			if (fd < 0) {
564				warn("%s", cp);
565				return;
566			}
567			if (verbose)
568				printf("getting from %s:%s to %s [%s]\n",
569				    hostname, src, cp, mode);
570			recvfile(peer, port, fd, src, mode);
571			break;
572		}
573		cp = tail(src);         /* new .. jdg */
574		fd = creat(cp, 0644);
575		if (fd < 0) {
576			warn("%s", cp);
577			continue;
578		}
579		if (verbose)
580			printf("getting from %s:%s to %s [%s]\n",
581			    hostname, src, cp, mode);
582		recvfile(peer, port, fd, src, mode);
583	}
584}
585
586static void
587getusage(char *s)
588{
589
590	printf("usage: %s file [localname]\n", s);
591	printf("       %s [host:]file [localname]\n", s);
592	printf("       %s [host1:]file1 [host2:]file2 ... [hostN:]fileN\n", s);
593}
594
595static void
596settimeoutpacket(int argc, char *argv[])
597{
598	int t;
599	char	line[MAXLINE];
600
601	if (argc < 2) {
602		strcpy(line, "Packet timeout ");
603		printf("(value) ");
604		fgets(&line[strlen(line)], sizeof line - strlen(line), stdin);
605		makeargv(line);
606		argc = margc;
607		argv = margv;
608	}
609	if (argc != 2) {
610		printf("usage: %s value\n", argv[0]);
611		return;
612	}
613	t = atoi(argv[1]);
614	if (t < 0) {
615		printf("%s: bad value\n", argv[1]);
616		return;
617	}
618
619	settimeouts(t, timeoutnetwork, maxtimeouts);
620}
621
622static void
623settimeoutnetwork(int argc, char *argv[])
624{
625	int t;
626	char	line[MAXLINE];
627
628	if (argc < 2) {
629		strcpy(line, "Network timeout ");
630		printf("(value) ");
631		fgets(&line[strlen(line)], sizeof line - strlen(line), stdin);
632		makeargv(line);
633		argc = margc;
634		argv = margv;
635	}
636	if (argc != 2) {
637		printf("usage: %s value\n", argv[0]);
638		return;
639	}
640	t = atoi(argv[1]);
641	if (t < 0) {
642		printf("%s: bad value\n", argv[1]);
643		return;
644	}
645
646	settimeouts(timeoutpacket, t, maxtimeouts);
647}
648
649static void
650showstatus(int argc __unused, char *argv[] __unused)
651{
652
653	printf("Remote host: %s\n",
654	    connected ? hostname : "none specified yet");
655	printf("RFC2347 Options support: %s\n",
656	    options_rfc_enabled ? "enabled" : "disabled");
657	printf("Non-RFC defined options support: %s\n",
658	    options_extra_enabled ? "enabled" : "disabled");
659	printf("Mode: %s\n", mode);
660	printf("Verbose: %s\n", verbose ? "on" : "off");
661	printf("Debug: %s\n", debug_show(debug));
662	printf("Artificial packetloss: %d in 100 packets\n",
663	    packetdroppercentage);
664	printf("Segment size: %d bytes\n", segsize);
665	printf("Network timeout: %d seconds\n", timeoutpacket);
666	printf("Maximum network timeout: %d seconds\n", timeoutnetwork);
667	printf("Maximum timeouts: %d \n", maxtimeouts);
668}
669
670static void
671intr(int dummy __unused)
672{
673
674	signal(SIGALRM, SIG_IGN);
675	alarm(0);
676	longjmp(toplevel, -1);
677}
678
679static char *
680tail(char *filename)
681{
682	char *s;
683
684	while (*filename) {
685		s = rindex(filename, '/');
686		if (s == NULL)
687			break;
688		if (s[1])
689			return (s + 1);
690		*s = '\0';
691	}
692	return (filename);
693}
694
695static const char *
696command_prompt(void)
697{
698
699	return ("tftp> ");
700}
701
702/*
703 * Command parser.
704 */
705static void
706command(void)
707{
708	HistEvent he;
709	struct cmd *c;
710	static EditLine *el;
711	static History *hist;
712	const char *bp;
713	char *cp;
714	int len, num, vrbose;
715	char	line[MAXLINE];
716
717	vrbose = isatty(0);
718	if (vrbose) {
719		el = el_init("tftp", stdin, stdout, stderr);
720		hist = history_init();
721		history(hist, &he, H_SETSIZE, 100);
722		el_set(el, EL_HIST, history, hist);
723		el_set(el, EL_EDITOR, "emacs");
724		el_set(el, EL_PROMPT, command_prompt);
725		el_set(el, EL_SIGNAL, 1);
726		el_source(el, NULL);
727	}
728	for (;;) {
729		if (vrbose) {
730                        if ((bp = el_gets(el, &num)) == NULL || num == 0)
731                                exit(0);
732                        len = (num > MAXLINE) ? MAXLINE : num;
733                        memcpy(line, bp, len);
734                        line[len] = '\0';
735                        history(hist, &he, H_ENTER, bp);
736		} else {
737			line[0] = 0;
738			if (fgets(line, sizeof line , stdin) == 0) {
739				if (feof(stdin)) {
740					exit(txrx_error);
741				} else {
742					continue;
743				}
744			}
745		}
746		if ((cp = strchr(line, '\n')))
747			*cp = '\0';
748		if (line[0] == 0)
749			continue;
750		makeargv(line);
751		if (margc == 0)
752			continue;
753		c = getcmd(margv[0]);
754		if (c == (struct cmd *)-1) {
755			printf("?Ambiguous command\n");
756			continue;
757		}
758		if (c == 0) {
759			printf("?Invalid command\n");
760			continue;
761		}
762		(*c->handler)(margc, margv);
763	}
764}
765
766static struct cmd *
767getcmd(char *name)
768{
769	const char *p, *q;
770	struct cmd *c, *found;
771	int nmatches, longest;
772
773	longest = 0;
774	nmatches = 0;
775	found = 0;
776	for (c = cmdtab; (p = c->name) != NULL; c++) {
777		for (q = name; *q == *p++; q++)
778			if (*q == 0)		/* exact match? */
779				return (c);
780		if (!*q) {			/* the name was a prefix */
781			if (q - name > longest) {
782				longest = q - name;
783				nmatches = 1;
784				found = c;
785			} else if (q - name == longest)
786				nmatches++;
787		}
788	}
789	if (nmatches > 1)
790		return ((struct cmd *)-1);
791	return (found);
792}
793
794/*
795 * Slice a string up into argc/argv.
796 */
797static void
798makeargv(char *line)
799{
800	char *cp;
801	char **argp = margv;
802
803	margc = 0;
804	if ((cp = strchr(line, '\n')) != NULL)
805		*cp = '\0';
806	for (cp = line; margc < MAX_MARGV - 1 && *cp != '\0';) {
807		while (isspace(*cp))
808			cp++;
809		if (*cp == '\0')
810			break;
811		*argp++ = cp;
812		margc += 1;
813		while (*cp != '\0' && !isspace(*cp))
814			cp++;
815		if (*cp == '\0')
816			break;
817		*cp++ = '\0';
818	}
819	*argp++ = 0;
820}
821
822static void
823quit(int argc __unused, char *argv[] __unused)
824{
825
826	exit(txrx_error);
827}
828
829/*
830 * Help command.
831 */
832static void
833help(int argc, char *argv[])
834{
835	struct cmd *c;
836
837	if (argc == 1) {
838		printf("Commands may be abbreviated.  Commands are:\n\n");
839		for (c = cmdtab; c->name; c++)
840			printf("%-*s\t%s\n", (int)HELPINDENT, c->name, c->help);
841
842		printf("\n[-] : You shouldn't use these ones anymore.\n");
843		printf("[*] : RFC2834 options support required.\n");
844		printf("[**] : Non-standard RFC2834 option.\n");
845		return;
846	}
847	while (--argc > 0) {
848		char *arg;
849		arg = *++argv;
850		c = getcmd(arg);
851		if (c == (struct cmd *)-1)
852			printf("?Ambiguous help command: %s\n", arg);
853		else if (c == (struct cmd *)0)
854			printf("?Invalid help command: %s\n", arg);
855		else
856			printf("%s\n", c->help);
857	}
858}
859
860static void
861setverbose(int argc __unused, char *argv[] __unused)
862{
863
864	verbose = !verbose;
865	printf("Verbose mode %s.\n", verbose ? "on" : "off");
866}
867
868static void
869setoptions(int argc, char *argv[])
870{
871
872	if (argc == 2) {
873		if (strcasecmp(argv[1], "enable") == 0 ||
874		    strcasecmp(argv[1], "on") == 0) {
875			options_extra_enabled = 1;
876			options_rfc_enabled = 1;
877		}
878		if (strcasecmp(argv[1], "disable") == 0 ||
879		    strcasecmp(argv[1], "off") == 0) {
880			options_extra_enabled = 0;
881			options_rfc_enabled = 0;
882		}
883		if (strcasecmp(argv[1], "extra") == 0)
884			options_extra_enabled = !options_extra_enabled;
885	}
886	printf("Support for RFC2347 style options are now %s.\n",
887	    options_rfc_enabled ? "enabled" : "disabled");
888	printf("Support for non-RFC defined options are now %s.\n",
889	    options_extra_enabled ? "enabled" : "disabled");
890
891	printf("\nThe following options are available:\n"
892	    "\toptions on	: enable support for RFC2347 style options\n"
893	    "\toptions off	: disable support for RFC2347 style options\n"
894	    "\toptions extra	: toggle support for non-RFC defined options\n"
895	);
896}
897
898static void
899setrollover(int argc, char *argv[])
900{
901
902	if (argc == 2) {
903		if (strcasecmp(argv[1], "never") == 0 ||
904		    strcasecmp(argv[1], "none") == 0) {
905			free(options[OPT_ROLLOVER].o_request);
906			options[OPT_ROLLOVER].o_request = NULL;
907		}
908		if (strcasecmp(argv[1], "1") == 0) {
909			free(options[OPT_ROLLOVER].o_request);
910			options[OPT_ROLLOVER].o_request = strdup("1");
911		}
912		if (strcasecmp(argv[1], "0") == 0) {
913			free(options[OPT_ROLLOVER].o_request);
914			options[OPT_ROLLOVER].o_request = strdup("0");
915		}
916	}
917	printf("Support for the rollover options is %s.\n",
918	    options[OPT_ROLLOVER].o_request != NULL ? "enabled" : "disabled");
919	if (options[OPT_ROLLOVER].o_request != NULL)
920		printf("Block rollover will be to block %s.\n",
921		    options[OPT_ROLLOVER].o_request);
922
923
924	printf("\nThe following rollover options are available:\n"
925	    "\trollover 0	: rollover to block zero (default)\n"
926	    "\trollover 1	: rollover to block one\n"
927	    "\trollover never	: do not support the rollover option\n"
928	    "\trollover none	: do not support the rollover option\n"
929	);
930}
931
932static void
933setdebug(int argc, char *argv[])
934{
935	int i;
936
937	if (argc != 1) {
938		i = 1;
939		while (i < argc)
940			debug ^= debug_find(argv[i++]);
941	}
942	printf("The following debugging is enabled: %s\n", debug_show(debug));
943
944	printf("\nThe following debugs are available:\n");
945	i = 0;
946	while (debugs[i].name != NULL) {
947		printf("\t%s\t%s\n", debugs[i].name, debugs[i].desc);
948		i++;
949	}
950}
951
952static void
953setblocksize(int argc, char *argv[])
954{
955
956	if (!options_rfc_enabled)
957		printf("RFC2347 style options are not enabled "
958		    "(but proceding anyway)\n");
959
960	if (argc != 1) {
961		int size = atoi(argv[1]);
962		size_t max;
963		u_long maxdgram;
964
965		max = sizeof(maxdgram);
966		if (sysctlbyname("net.inet.udp.maxdgram",
967			&maxdgram, &max, NULL, 0) < 0) {
968			perror("sysctl: net.inet.udp.maxdgram");
969			return;
970		}
971
972		if (size < BLKSIZE_MIN || size > BLKSIZE_MAX) {
973			printf("Blocksize should be between %d and %d bytes.\n",
974				BLKSIZE_MIN, BLKSIZE_MAX);
975			return;
976		} else if (size > (int)maxdgram - 4) {
977			printf("Blocksize can't be bigger than %ld bytes due "
978			    "to the net.inet.udp.maxdgram sysctl limitation.\n",
979			    maxdgram - 4);
980			asprintf(&options[OPT_BLKSIZE].o_request,
981			    "%ld", maxdgram - 4);
982		} else {
983			asprintf(&options[OPT_BLKSIZE].o_request, "%d", size);
984		}
985	}
986	printf("Blocksize is now %s bytes.\n", options[OPT_BLKSIZE].o_request);
987}
988
989static void
990setblocksize2(int argc, char *argv[])
991{
992
993	if (!options_rfc_enabled || !options_extra_enabled)
994		printf(
995		    "RFC2347 style or non-RFC defined options are not enabled "
996		    "(but proceding anyway)\n");
997
998	if (argc != 1) {
999		int size = atoi(argv[1]);
1000		int i;
1001		size_t max;
1002		u_long maxdgram;
1003
1004		int sizes[] = {
1005			8, 16, 32, 64, 128, 256, 512, 1024,
1006			2048, 4096, 8192, 16384, 32768, 0
1007		};
1008
1009		max = sizeof(maxdgram);
1010		if (sysctlbyname("net.inet.udp.maxdgram",
1011			&maxdgram, &max, NULL, 0) < 0) {
1012			perror("sysctl: net.inet.udp.maxdgram");
1013			return;
1014		}
1015
1016		for (i = 0; sizes[i] != 0; i++) {
1017			if (sizes[i] == size) break;
1018		}
1019		if (sizes[i] == 0) {
1020			printf("Blocksize2 should be a power of two between "
1021			    "8 and 32768.\n");
1022			return;
1023		}
1024
1025		if (size < BLKSIZE_MIN || size > BLKSIZE_MAX) {
1026			printf("Blocksize2 should be between "
1027			    "%d and %d bytes.\n", BLKSIZE_MIN, BLKSIZE_MAX);
1028			return;
1029		} else if (size > (int)maxdgram - 4) {
1030			printf("Blocksize2 can't be bigger than %ld bytes due "
1031			    "to the net.inet.udp.maxdgram sysctl limitation.\n",
1032			    maxdgram - 4);
1033			for (i = 0; sizes[i+1] != 0; i++) {
1034				if ((int)maxdgram < sizes[i+1]) break;
1035			}
1036			asprintf(&options[OPT_BLKSIZE2].o_request,
1037			    "%d", sizes[i]);
1038		} else {
1039			asprintf(&options[OPT_BLKSIZE2].o_request, "%d", size);
1040		}
1041	}
1042	printf("Blocksize2 is now %s bytes.\n",
1043	    options[OPT_BLKSIZE2].o_request);
1044}
1045
1046static void
1047setpacketdrop(int argc, char *argv[])
1048{
1049
1050	if (argc != 1)
1051		packetdroppercentage = atoi(argv[1]);
1052
1053	printf("Randomly %d in 100 packets will be dropped\n",
1054	    packetdroppercentage);
1055}
1056