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/usr.bin/tftp/main.c

https://bitbucket.org/freebsd/freebsd-head/
C | 1054 lines | 869 code | 120 blank | 65 comment | 209 complexity | 415be53676a36967f392ad4e478e032e MD5 | raw file
   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("$FreeBSD$");
  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		200
  78#define	TIMEOUT		5		/* secs between rexmt's */
  79
  80typedef struct	sockaddr_storage peeraddr;
  81static int	connected;
  82static char	mode[32];
  83jmp_buf		toplevel;
  84volatile int	txrx_error;
  85static int	peer;
  86
  87#define	MAX_MARGV	20
  88static int	margc;
  89static char	*margv[MAX_MARGV];
  90
  91int		verbose;
  92char		*port = NULL;
  93
  94static void	get(int, char **);
  95static void	help(int, char **);
  96static void	intr(int);
  97static void	modecmd(int, char **);
  98static void	put(int, char **);
  99static void	quit(int, char **);
 100static void	setascii(int, char **);
 101static void	setbinary(int, char **);
 102static void	setpeer0(char *, const char *);
 103static void	setpeer(int, char **);
 104static void	settimeoutpacket(int, char **);
 105static void	settimeoutnetwork(int, char **);
 106static void	setdebug(int, char **);
 107static void	setverbose(int, char **);
 108static void	showstatus(int, char **);
 109static void	setblocksize(int, char **);
 110static void	setblocksize2(int, char **);
 111static void	setoptions(int, char **);
 112static void	setrollover(int, char **);
 113static void	setpacketdrop(int, char **);
 114
 115static void command(void) __dead2;
 116static const char *command_prompt(void);
 117
 118static void urihandling(char *URI);
 119static void getusage(char *);
 120static void makeargv(char *line);
 121static void putusage(char *);
 122static void settftpmode(const char *);
 123
 124static char	*tail(char *);
 125static struct	cmd *getcmd(char *);
 126
 127#define HELPINDENT (sizeof("connect"))
 128
 129struct cmd {
 130	const char	*name;
 131	void	(*handler)(int, char **);
 132	const char	*help;
 133};
 134
 135static 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
 162static 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
 174int
 175main(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 */
 214static void
 215urihandling(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
 266static char    hostname[MAXHOSTNAMELEN];
 267
 268static void
 269setpeer0(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
 334static void
 335setpeer(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
 358static void
 359modecmd(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
 391static void
 392setbinary(int argc __unused, char *argv[] __unused)
 393{
 394
 395	settftpmode("octet");
 396}
 397
 398static void
 399setascii(int argc __unused, char *argv[] __unused)
 400{
 401
 402	settftpmode("netascii");
 403}
 404
 405static void
 406settftpmode(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 */
 418static void
 419put(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
 500static void
 501putusage(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 */
 512static void
 513get(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
 585static void
 586getusage(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
 594static void
 595settimeoutpacket(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
 621static void
 622settimeoutnetwork(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
 648static void
 649showstatus(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
 669static void
 670intr(int dummy __unused)
 671{
 672
 673	signal(SIGALRM, SIG_IGN);
 674	alarm(0);
 675	longjmp(toplevel, -1);
 676}
 677
 678static char *
 679tail(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
 694static const char *
 695command_prompt(void)
 696{
 697
 698	return ("tftp> ");
 699}
 700
 701/*
 702 * Command parser.
 703 */
 704static void
 705command(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
 765static struct cmd *
 766getcmd(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 */
 796static void
 797makeargv(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
 821static void
 822quit(int argc __unused, char *argv[] __unused)
 823{
 824
 825	exit(txrx_error);
 826}
 827
 828/*
 829 * Help command.
 830 */
 831static void
 832help(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
 859static void
 860setverbose(int argc __unused, char *argv[] __unused)
 861{
 862
 863	verbose = !verbose;
 864	printf("Verbose mode %s.\n", verbose ? "on" : "off");
 865}
 866
 867static void
 868setoptions(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
 897static void
 898setrollover(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
 931static void
 932setdebug(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
 951static void
 952setblocksize(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
 988static void
 989setblocksize2(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
1045static void
1046setpacketdrop(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}