1 files changed, 1054 insertions, 0 deletions
diff --git a/usr.bin/tftp/main.c b/usr.bin/tftp/main.c
new file mode 100644
index 0000000..669299b
--- /dev/null
+++ b/usr.bin/tftp/main.c
@@ -0,0 +1,1054 @@
+/*
+ * Copyright (c) 1983, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+static const char copyright[] =
+"@(#) Copyright (c) 1983, 1993\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif
+
+#if 0
+#ifndef lint
+static char sccsid[] = "@(#)main.c	8.1 (Berkeley) 6/6/93";
+#endif
+#endif
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/* Many bug fixes are from Jim Guyton <guyton@rand-unix> */
+
+/*
+ * TFTP User Program -- Command Interface.
+ */
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/sysctl.h>
+#include <sys/file.h>
+#include <sys/stat.h>
+
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <arpa/tftp.h>
+
+#include <ctype.h>
+#include <err.h>
+#include <histedit.h>
+#include <netdb.h>
+#include <setjmp.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "tftp-utils.h"
+#include "tftp-io.h"
+#include "tftp-options.h"
+#include "tftp.h"
+
+#define	MAXLINE		200
+#define	TIMEOUT		5		/* secs between rexmt's */
+
+typedef struct	sockaddr_storage peeraddr;
+static int	connected;
+static char	mode[32];
+jmp_buf		toplevel;
+volatile int	txrx_error;
+static int	peer;
+
+#define	MAX_MARGV	20
+static int	margc;
+static char	*margv[MAX_MARGV];
+
+int		verbose;
+char		*port = NULL;
+
+static void	get(int, char **);
+static void	help(int, char **);
+static void	intr(int);
+static void	modecmd(int, char **);
+static void	put(int, char **);
+static void	quit(int, char **);
+static void	setascii(int, char **);
+static void	setbinary(int, char **);
+static void	setpeer0(char *, const char *);
+static void	setpeer(int, char **);
+static void	settimeoutpacket(int, char **);
+static void	settimeoutnetwork(int, char **);
+static void	setdebug(int, char **);
+static void	setverbose(int, char **);
+static void	showstatus(int, char **);
+static void	setblocksize(int, char **);
+static void	setblocksize2(int, char **);
+static void	setoptions(int, char **);
+static void	setrollover(int, char **);
+static void	setpacketdrop(int, char **);
+
+static void command(void) __dead2;
+static const char *command_prompt(void);
+
+static void urihandling(char *URI);
+static void getusage(char *);
+static void makeargv(char *line);
+static void putusage(char *);
+static void settftpmode(const char *);
+
+static char	*tail(char *);
+static struct	cmd *getcmd(char *);
+
+#define HELPINDENT (sizeof("connect"))
+
+struct cmd {
+	const char	*name;
+	void	(*handler)(int, char **);
+	const char	*help;
+};
+
+static struct cmd cmdtab[] = {
+	{ "connect",	setpeer,	"connect to remote tftp"	},
+	{ "mode",	modecmd,	"set file transfer mode"	},
+	{ "put",	put,		"send file"			},
+	{ "get",	get,		"receive file"			},
+	{ "quit",	quit,		"exit tftp"			},
+	{ "verbose",	setverbose,	"toggle verbose mode"		},
+	{ "status",	showstatus,	"show current status"		},
+	{ "binary",     setbinary,	"set mode to octet"		},
+	{ "ascii",      setascii,	"set mode to netascii"		},
+	{ "rexmt",	settimeoutpacket,
+	  "set per-packet retransmission timeout[-]" },
+	{ "timeout",	settimeoutnetwork,
+	  "set total retransmission timeout" },
+	{ "trace",	setdebug,	"enable 'debug packet'[-]"	},
+	{ "debug",	setdebug,	"enable verbose output"		},
+	{ "blocksize",	setblocksize,	"set blocksize[*]"		},
+	{ "blocksize2",	setblocksize2,	"set blocksize as a power of 2[**]" },
+	{ "rollover",	setrollover,	"rollover after 64K packets[**]" },
+	{ "options",	setoptions,
+	  "enable or disable RFC2347 style options" },
+	{ "help",	help,		"print help information"	},
+	{ "packetdrop",	setpacketdrop,	"artificial packetloss feature"	},
+	{ "?",		help,		"print help information"	},
+	{ NULL,		NULL,		NULL				}
+};
+
+static struct	modes {
+	const char *m_name;
+	const char *m_mode;
+} modes[] = {
+	{ "ascii",	"netascii" },
+	{ "netascii",	"netascii" },
+	{ "binary",	"octet" },
+	{ "image",	"octet" },
+	{ "octet",	"octet" },
+	{ NULL,		NULL }
+};
+
+int
+main(int argc, char *argv[])
+{
+
+	acting_as_client = 1;
+	peer = -1;
+	strcpy(mode, "netascii");
+	signal(SIGINT, intr);
+	if (argc > 1) {
+		if (setjmp(toplevel) != 0)
+			exit(txrx_error);
+
+		if (strncmp(argv[1], "tftp://", 7) == 0) {
+			urihandling(argv[1]);
+			exit(txrx_error);
+		}
+
+		setpeer(argc, argv);
+	}
+	if (setjmp(toplevel) != 0)
+		(void)putchar('\n');
+
+	init_options();
+	command();
+}
+
+/*
+ * RFC3617 handling of TFTP URIs:
+ *
+ *    tftpURI         = "tftp://" host "/" file [ mode ]
+ *    mode            = ";"  "mode=" ( "netascii" / "octet" )
+ *    file            = *( unreserved / escaped )
+ *    host            = <as specified by RFC 2732>
+ *    unreserved      = <as specified in RFC 2396>
+ *    escaped         = <as specified in RFC 2396>
+ *
+ * We are cheating a little bit by allowing any mode as specified in the
+ * modes table defined earlier on in this file and mapping it on the real
+ * mode.
+ */
+static void
+urihandling(char *URI)
+{
+	char	uri[ARG_MAX];
+	char	*host = NULL;
+	char	*path = NULL;
+	char	*opts = NULL;
+	const char *tmode = "octet";
+	char	*s;
+	char	line[MAXLINE];
+	int	i;
+
+	strncpy(uri, URI, ARG_MAX);
+	host = uri + 7;
+
+	if ((s = strchr(host, '/')) == NULL) {
+		fprintf(stderr,
+		    "Invalid URI: Couldn't find / after hostname\n");
+		exit(1);
+	}
+	*s = '\0';
+	path = s + 1;
+
+	if ((s = strchr(path, ';')) != NULL) {
+		*s = '\0';
+		opts = s + 1;
+
+		if (strncmp(opts, "mode=", 5) == 0) {
+			tmode = opts;
+			tmode += 5;
+
+			for (i = 0; modes[i].m_name != NULL; i++) {
+				if (strcmp(modes[i].m_name, tmode) == 0)
+					break;
+			}
+			if (modes[i].m_name == NULL) {
+				fprintf(stderr, "Invalid mode: '%s'\n", mode);
+				exit(1);
+			}
+			settftpmode(modes[i].m_mode);
+		}
+	} else {
+		settftpmode("octet");
+	}
+
+	setpeer0(host, NULL);
+
+	sprintf(line, "get %s", path);
+	makeargv(line);
+	get(margc, margv);
+}
+
+static char    hostname[MAXHOSTNAMELEN];
+
+static void
+setpeer0(char *host, const char *lport)
+{
+	struct addrinfo hints, *res0, *res;
+	int error;
+	const char *cause = "unknown";
+
+	if (connected) {
+		close(peer);
+		peer = -1;
+	}
+	connected = 0;
+
+	memset(&hints, 0, sizeof(hints));
+	hints.ai_family = PF_UNSPEC;
+	hints.ai_socktype = SOCK_DGRAM;
+	hints.ai_protocol = IPPROTO_UDP;
+	hints.ai_flags = AI_CANONNAME;
+	if (!lport)
+		lport = "tftp";
+	error = getaddrinfo(host, lport, &hints, &res0);
+	if (error) {
+		warnx("%s", gai_strerror(error));
+		return;
+	}
+
+	for (res = res0; res; res = res->ai_next) {
+		if (res->ai_addrlen > sizeof(peeraddr))
+			continue;
+		peer = socket(res->ai_family, res->ai_socktype,
+			res->ai_protocol);
+		if (peer < 0) {
+			cause = "socket";
+			continue;
+		}
+
+		memset(&peer_sock, 0, sizeof(peer_sock));
+		peer_sock.ss_family = res->ai_family;
+		peer_sock.ss_len = res->ai_addrlen;
+		if (bind(peer, (struct sockaddr *)&peer_sock, peer_sock.ss_len) < 0) {
+			cause = "bind";
+			close(peer);
+			peer = -1;
+			continue;
+		}
+
+		break;
+	}
+
+	if (peer < 0)
+		warn("%s", cause);
+	else {
+		/* res->ai_addr <= sizeof(peeraddr) is guaranteed */
+		memcpy(&peer_sock, res->ai_addr, res->ai_addrlen);
+		if (res->ai_canonname) {
+			(void) strncpy(hostname, res->ai_canonname,
+				sizeof(hostname));
+		} else
+			(void) strncpy(hostname, host, sizeof(hostname));
+		hostname[sizeof(hostname)-1] = 0;
+		connected = 1;
+	}
+
+	freeaddrinfo(res0);
+}
+
+static void
+setpeer(int argc, char *argv[])
+{
+	char	line[MAXLINE];
+
+	if (argc < 2) {
+		strcpy(line, "Connect ");
+		printf("(to) ");
+		fgets(&line[strlen(line)], sizeof line - strlen(line), stdin);
+		makeargv(line);
+		argc = margc;
+		argv = margv;
+	}
+	if ((argc < 2) || (argc > 3)) {
+		printf("usage: %s [host [port]]\n", argv[0]);
+		return;
+	}
+	if (argc == 3) {
+		port = argv[2];
+		setpeer0(argv[1], argv[2]);
+	} else
+		setpeer0(argv[1], NULL);
+}
+
+static void
+modecmd(int argc, char *argv[])
+{
+	struct modes *p;
+	const char *sep;
+
+	if (argc < 2) {
+		printf("Using %s mode to transfer files.\n", mode);
+		return;
+	}
+	if (argc == 2) {
+		for (p = modes; p->m_name; p++)
+			if (strcmp(argv[1], p->m_name) == 0)
+				break;
+		if (p->m_name) {
+			settftpmode(p->m_mode);
+			return;
+		}
+		printf("%s: unknown mode\n", argv[1]);
+		/* drop through and print usage message */
+	}
+
+	printf("usage: %s [", argv[0]);
+	sep = " ";
+	for (p = modes; p->m_name != NULL; p++) {
+		printf("%s%s", sep, p->m_name);
+		if (*sep == ' ')
+			sep = " | ";
+	}
+	printf(" ]\n");
+	return;
+}
+
+static void
+setbinary(int argc __unused, char *argv[] __unused)
+{
+
+	settftpmode("octet");
+}
+
+static void
+setascii(int argc __unused, char *argv[] __unused)
+{
+
+	settftpmode("netascii");
+}
+
+static void
+settftpmode(const char *newmode)
+{
+
+	strcpy(mode, newmode);
+	if (verbose)
+		printf("mode set to %s\n", mode);
+}
+
+
+/*
+ * Send file(s).
+ */
+static void
+put(int argc, char *argv[])
+{
+	int	fd;
+	int	n;
+	char	*cp, *targ;
+	char	line[MAXLINE];
+	struct stat sb;
+
+	if (argc < 2) {
+		strcpy(line, "send ");
+		printf("(file) ");
+		fgets(&line[strlen(line)], sizeof line - strlen(line), stdin);
+		makeargv(line);
+		argc = margc;
+		argv = margv;
+	}
+	if (argc < 2) {
+		putusage(argv[0]);
+		return;
+	}
+	targ = argv[argc - 1];
+	if (strrchr(argv[argc - 1], ':')) {
+		char *lcp;
+
+		for (n = 1; n < argc - 1; n++)
+			if (strchr(argv[n], ':')) {
+				putusage(argv[0]);
+				return;
+			}
+		lcp = argv[argc - 1];
+		targ = strrchr(lcp, ':');
+		*targ++ = 0;
+		if (lcp[0] == '[' && lcp[strlen(lcp) - 1] == ']') {
+			lcp[strlen(lcp) - 1] = '\0';
+			lcp++;
+		}
+		setpeer0(lcp, NULL);		
+	}
+	if (!connected) {
+		printf("No target machine specified.\n");
+		return;
+	}
+	if (argc < 4) {
+		cp = argc == 2 ? tail(targ) : argv[1];
+		fd = open(cp, O_RDONLY);
+		if (fd < 0) {
+			warn("%s", cp);
+			return;
+		}
+
+		stat(cp, &sb);
+		asprintf(&options[OPT_TSIZE].o_request, "%ju", sb.st_size);
+
+		if (verbose)
+			printf("putting %s to %s:%s [%s]\n",
+			    cp, hostname, targ, mode);
+		xmitfile(peer, port, fd, targ, mode);
+		return;
+	}
+				/* this assumes the target is a directory */
+				/* on a remote unix system.  hmmmm.  */
+	cp = strchr(targ, '\0');
+	*cp++ = '/';
+	for (n = 1; n < argc - 1; n++) {
+		strcpy(cp, tail(argv[n]));
+		fd = open(argv[n], O_RDONLY);
+		if (fd < 0) {
+			warn("%s", argv[n]);
+			continue;
+		}
+
+		stat(cp, &sb);
+		asprintf(&options[OPT_TSIZE].o_request, "%ju", sb.st_size);
+
+		if (verbose)
+			printf("putting %s to %s:%s [%s]\n",
+			    argv[n], hostname, targ, mode);
+		xmitfile(peer, port, fd, targ, mode);
+	}
+}
+
+static void
+putusage(char *s)
+{
+
+	printf("usage: %s file [remotename]\n", s);
+	printf("       %s file host:remotename\n", s);
+	printf("       %s file1 file2 ... fileN [[host:]remote-directory]\n", s);
+}
+
+/*
+ * Receive file(s).
+ */
+static void
+get(int argc, char *argv[])
+{
+	int fd;
+	int n;
+	char *cp;
+	char *src;
+	char	line[MAXLINE];
+
+	if (argc < 2) {
+		strcpy(line, "get ");
+		printf("(files) ");
+		fgets(&line[strlen(line)], sizeof line - strlen(line), stdin);
+		makeargv(line);
+		argc = margc;
+		argv = margv;
+	}
+	if (argc < 2) {
+		getusage(argv[0]);
+		return;
+	}
+	if (!connected) {
+		for (n = 1; n < argc ; n++)
+			if (strrchr(argv[n], ':') == 0) {
+				printf("No remote host specified and "
+				    "no host given for file '%s'\n", argv[n]);
+				getusage(argv[0]);
+				return;
+			}
+	}
+	for (n = 1; n < argc ; n++) {
+		src = strrchr(argv[n], ':');
+		if (src == NULL)
+			src = argv[n];
+		else {
+			char *lcp;
+
+			*src++ = 0;
+			lcp = argv[n];
+			if (lcp[0] == '[' && lcp[strlen(lcp) - 1] == ']') {
+				lcp[strlen(lcp) - 1] = '\0';
+				lcp++;
+			}
+			setpeer0(lcp, NULL);
+			if (!connected)
+				continue;
+		}
+		if (argc < 4) {
+			cp = argc == 3 ? argv[2] : tail(src);
+			fd = creat(cp, 0644);
+			if (fd < 0) {
+				warn("%s", cp);
+				return;
+			}
+			if (verbose)
+				printf("getting from %s:%s to %s [%s]\n",
+				    hostname, src, cp, mode);
+			recvfile(peer, port, fd, src, mode);
+			break;
+		}
+		cp = tail(src);         /* new .. jdg */
+		fd = creat(cp, 0644);
+		if (fd < 0) {
+			warn("%s", cp);
+			continue;
+		}
+		if (verbose)
+			printf("getting from %s:%s to %s [%s]\n",
+			    hostname, src, cp, mode);
+		recvfile(peer, port, fd, src, mode);
+	}
+}
+
+static void
+getusage(char *s)
+{
+
+	printf("usage: %s file [localname]\n", s);
+	printf("       %s [host:]file [localname]\n", s);
+	printf("       %s [host1:]file1 [host2:]file2 ... [hostN:]fileN\n", s);
+}
+
+static void
+settimeoutpacket(int argc, char *argv[])
+{
+	int t;
+	char	line[MAXLINE];
+
+	if (argc < 2) {
+		strcpy(line, "Packet timeout ");
+		printf("(value) ");
+		fgets(&line[strlen(line)], sizeof line - strlen(line), stdin);
+		makeargv(line);
+		argc = margc;
+		argv = margv;
+	}
+	if (argc != 2) {
+		printf("usage: %s value\n", argv[0]);
+		return;
+	}
+	t = atoi(argv[1]);
+	if (t < 0) {
+		printf("%s: bad value\n", argv[1]);
+		return;
+	}
+
+	settimeouts(t, timeoutnetwork, maxtimeouts);
+}
+
+static void
+settimeoutnetwork(int argc, char *argv[])
+{
+	int t;
+	char	line[MAXLINE];
+
+	if (argc < 2) {
+		strcpy(line, "Network timeout ");
+		printf("(value) ");
+		fgets(&line[strlen(line)], sizeof line - strlen(line), stdin);
+		makeargv(line);
+		argc = margc;
+		argv = margv;
+	}
+	if (argc != 2) {
+		printf("usage: %s value\n", argv[0]);
+		return;
+	}
+	t = atoi(argv[1]);
+	if (t < 0) {
+		printf("%s: bad value\n", argv[1]);
+		return;
+	}
+
+	settimeouts(timeoutpacket, t, maxtimeouts);
+}
+
+static void
+showstatus(int argc __unused, char *argv[] __unused)
+{
+
+	printf("Remote host: %s\n",
+	    connected ? hostname : "none specified yet");
+	printf("RFC2347 Options support: %s\n",
+	    options_rfc_enabled ? "enabled" : "disabled");
+	printf("Non-RFC defined options support: %s\n",
+	    options_extra_enabled ? "enabled" : "disabled");
+	printf("Mode: %s\n", mode);
+	printf("Verbose: %s\n", verbose ? "on" : "off");
+	printf("Debug: %s\n", debug_show(debug));
+	printf("Artificial packetloss: %d in 100 packets\n",
+	    packetdroppercentage);
+	printf("Segment size: %d bytes\n", segsize);
+	printf("Network timeout: %d seconds\n", timeoutpacket);
+	printf("Maximum network timeout: %d seconds\n", timeoutnetwork);
+	printf("Maximum timeouts: %d \n", maxtimeouts);
+}
+
+static void
+intr(int dummy __unused)
+{
+
+	signal(SIGALRM, SIG_IGN);
+	alarm(0);
+	longjmp(toplevel, -1);
+}
+
+static char *
+tail(char *filename)
+{
+	char *s;
+
+	while (*filename) {
+		s = strrchr(filename, '/');
+		if (s == NULL)
+			break;
+		if (s[1])
+			return (s + 1);
+		*s = '\0';
+	}
+	return (filename);
+}
+
+static const char *
+command_prompt(void)
+{
+
+	return ("tftp> ");
+}
+
+/*
+ * Command parser.
+ */
+static void
+command(void)
+{
+	HistEvent he;
+	struct cmd *c;
+	static EditLine *el;
+	static History *hist;
+	const char *bp;
+	char *cp;
+	int len, num, vrbose;
+	char	line[MAXLINE];
+
+	vrbose = isatty(0);
+	if (vrbose) {
+		el = el_init("tftp", stdin, stdout, stderr);
+		hist = history_init();
+		history(hist, &he, H_SETSIZE, 100);
+		el_set(el, EL_HIST, history, hist);
+		el_set(el, EL_EDITOR, "emacs");
+		el_set(el, EL_PROMPT, command_prompt);
+		el_set(el, EL_SIGNAL, 1);
+		el_source(el, NULL);
+	}
+	for (;;) {
+		if (vrbose) {
+                        if ((bp = el_gets(el, &num)) == NULL || num == 0)
+                                exit(0);
+                        len = (num > MAXLINE) ? MAXLINE : num;
+                        memcpy(line, bp, len);
+                        line[len] = '\0';
+                        history(hist, &he, H_ENTER, bp);
+		} else {
+			line[0] = 0;
+			if (fgets(line, sizeof line , stdin) == NULL) {
+				if (feof(stdin)) {
+					exit(txrx_error);
+				} else {
+					continue;
+				}
+			}
+		}
+		if ((cp = strchr(line, '\n')))
+			*cp = '\0';
+		if (line[0] == 0)
+			continue;
+		makeargv(line);
+		if (margc == 0)
+			continue;
+		c = getcmd(margv[0]);
+		if (c == (struct cmd *)-1) {
+			printf("?Ambiguous command\n");
+			continue;
+		}
+		if (c == 0) {
+			printf("?Invalid command\n");
+			continue;
+		}
+		(*c->handler)(margc, margv);
+	}
+}
+
+static struct cmd *
+getcmd(char *name)
+{
+	const char *p, *q;
+	struct cmd *c, *found;
+	int nmatches, longest;
+
+	longest = 0;
+	nmatches = 0;
+	found = 0;
+	for (c = cmdtab; (p = c->name) != NULL; c++) {
+		for (q = name; *q == *p++; q++)
+			if (*q == 0)		/* exact match? */
+				return (c);
+		if (!*q) {			/* the name was a prefix */
+			if (q - name > longest) {
+				longest = q - name;
+				nmatches = 1;
+				found = c;
+			} else if (q - name == longest)
+				nmatches++;
+		}
+	}
+	if (nmatches > 1)
+		return ((struct cmd *)-1);
+	return (found);
+}
+
+/*
+ * Slice a string up into argc/argv.
+ */
+static void
+makeargv(char *line)
+{
+	char *cp;
+	char **argp = margv;
+
+	margc = 0;
+	if ((cp = strchr(line, '\n')) != NULL)
+		*cp = '\0';
+	for (cp = line; margc < MAX_MARGV - 1 && *cp != '\0';) {
+		while (isspace(*cp))
+			cp++;
+		if (*cp == '\0')
+			break;
+		*argp++ = cp;
+		margc += 1;
+		while (*cp != '\0' && !isspace(*cp))
+			cp++;
+		if (*cp == '\0')
+			break;
+		*cp++ = '\0';
+	}
+	*argp++ = 0;
+}
+
+static void
+quit(int argc __unused, char *argv[] __unused)
+{
+
+	exit(txrx_error);
+}
+
+/*
+ * Help command.
+ */
+static void
+help(int argc, char *argv[])
+{
+	struct cmd *c;
+
+	if (argc == 1) {
+		printf("Commands may be abbreviated.  Commands are:\n\n");
+		for (c = cmdtab; c->name; c++)
+			printf("%-*s\t%s\n", (int)HELPINDENT, c->name, c->help);
+
+		printf("\n[-] : You shouldn't use these ones anymore.\n");
+		printf("[*] : RFC2347 options support required.\n");
+		printf("[**] : Non-standard RFC2347 option.\n");
+		return;
+	}
+	while (--argc > 0) {
+		char *arg;
+		arg = *++argv;
+		c = getcmd(arg);
+		if (c == (struct cmd *)-1)
+			printf("?Ambiguous help command: %s\n", arg);
+		else if (c == (struct cmd *)0)
+			printf("?Invalid help command: %s\n", arg);
+		else
+			printf("%s\n", c->help);
+	}
+}
+
+static void
+setverbose(int argc __unused, char *argv[] __unused)
+{
+
+	verbose = !verbose;
+	printf("Verbose mode %s.\n", verbose ? "on" : "off");
+}
+
+static void
+setoptions(int argc, char *argv[])
+{
+
+	if (argc == 2) {
+		if (strcasecmp(argv[1], "enable") == 0 ||
+		    strcasecmp(argv[1], "on") == 0) {
+			options_extra_enabled = 1;
+			options_rfc_enabled = 1;
+		}
+		if (strcasecmp(argv[1], "disable") == 0 ||
+		    strcasecmp(argv[1], "off") == 0) {
+			options_extra_enabled = 0;
+			options_rfc_enabled = 0;
+		}
+		if (strcasecmp(argv[1], "extra") == 0)
+			options_extra_enabled = !options_extra_enabled;
+	}
+	printf("Support for RFC2347 style options are now %s.\n",
+	    options_rfc_enabled ? "enabled" : "disabled");
+	printf("Support for non-RFC defined options are now %s.\n",
+	    options_extra_enabled ? "enabled" : "disabled");
+
+	printf("\nThe following options are available:\n"
+	    "\toptions on	: enable support for RFC2347 style options\n"
+	    "\toptions off	: disable support for RFC2347 style options\n"
+	    "\toptions extra	: toggle support for non-RFC defined options\n"
+	);
+}
+
+static void
+setrollover(int argc, char *argv[])
+{
+
+	if (argc == 2) {
+		if (strcasecmp(argv[1], "never") == 0 ||
+		    strcasecmp(argv[1], "none") == 0) {
+			free(options[OPT_ROLLOVER].o_request);
+			options[OPT_ROLLOVER].o_request = NULL;
+		}
+		if (strcasecmp(argv[1], "1") == 0) {
+			free(options[OPT_ROLLOVER].o_request);
+			options[OPT_ROLLOVER].o_request = strdup("1");
+		}
+		if (strcasecmp(argv[1], "0") == 0) {
+			free(options[OPT_ROLLOVER].o_request);
+			options[OPT_ROLLOVER].o_request = strdup("0");
+		}
+	}
+	printf("Support for the rollover options is %s.\n",
+	    options[OPT_ROLLOVER].o_request != NULL ? "enabled" : "disabled");
+	if (options[OPT_ROLLOVER].o_request != NULL)
+		printf("Block rollover will be to block %s.\n",
+		    options[OPT_ROLLOVER].o_request);
+
+
+	printf("\nThe following rollover options are available:\n"
+	    "\trollover 0	: rollover to block zero (default)\n"
+	    "\trollover 1	: rollover to block one\n"
+	    "\trollover never	: do not support the rollover option\n"
+	    "\trollover none	: do not support the rollover option\n"
+	);
+}
+
+static void
+setdebug(int argc, char *argv[])
+{
+	int i;
+
+	if (argc != 1) {
+		i = 1;
+		while (i < argc)
+			debug ^= debug_find(argv[i++]);
+	}
+	printf("The following debugging is enabled: %s\n", debug_show(debug));
+
+	printf("\nThe following debugs are available:\n");
+	i = 0;
+	while (debugs[i].name != NULL) {
+		printf("\t%s\t%s\n", debugs[i].name, debugs[i].desc);
+		i++;
+	}
+}
+
+static void
+setblocksize(int argc, char *argv[])
+{
+
+	if (!options_rfc_enabled)
+		printf("RFC2347 style options are not enabled "
+		    "(but proceeding anyway)\n");
+
+	if (argc != 1) {
+		int size = atoi(argv[1]);
+		size_t max;
+		u_long maxdgram;
+
+		max = sizeof(maxdgram);
+		if (sysctlbyname("net.inet.udp.maxdgram",
+			&maxdgram, &max, NULL, 0) < 0) {
+			perror("sysctl: net.inet.udp.maxdgram");
+			return;
+		}
+
+		if (size < BLKSIZE_MIN || size > BLKSIZE_MAX) {
+			printf("Blocksize should be between %d and %d bytes.\n",
+				BLKSIZE_MIN, BLKSIZE_MAX);
+			return;
+		} else if (size > (int)maxdgram - 4) {
+			printf("Blocksize can't be bigger than %ld bytes due "
+			    "to the net.inet.udp.maxdgram sysctl limitation.\n",
+			    maxdgram - 4);
+			asprintf(&options[OPT_BLKSIZE].o_request,
+			    "%ld", maxdgram - 4);
+		} else {
+			asprintf(&options[OPT_BLKSIZE].o_request, "%d", size);
+		}
+	}
+	printf("Blocksize is now %s bytes.\n", options[OPT_BLKSIZE].o_request);
+}
+
+static void
+setblocksize2(int argc, char *argv[])
+{
+
+	if (!options_rfc_enabled || !options_extra_enabled)
+		printf(
+		    "RFC2347 style or non-RFC defined options are not enabled "
+		    "(but proceeding anyway)\n");
+
+	if (argc != 1) {
+		int size = atoi(argv[1]);
+		int i;
+		size_t max;
+		u_long maxdgram;
+
+		int sizes[] = {
+			8, 16, 32, 64, 128, 256, 512, 1024,
+			2048, 4096, 8192, 16384, 32768, 0
+		};
+
+		max = sizeof(maxdgram);
+		if (sysctlbyname("net.inet.udp.maxdgram",
+			&maxdgram, &max, NULL, 0) < 0) {
+			perror("sysctl: net.inet.udp.maxdgram");
+			return;
+		}
+
+		for (i = 0; sizes[i] != 0; i++) {
+			if (sizes[i] == size) break;
+		}
+		if (sizes[i] == 0) {
+			printf("Blocksize2 should be a power of two between "
+			    "8 and 32768.\n");
+			return;
+		}
+
+		if (size < BLKSIZE_MIN || size > BLKSIZE_MAX) {
+			printf("Blocksize2 should be between "
+			    "%d and %d bytes.\n", BLKSIZE_MIN, BLKSIZE_MAX);
+			return;
+		} else if (size > (int)maxdgram - 4) {
+			printf("Blocksize2 can't be bigger than %ld bytes due "
+			    "to the net.inet.udp.maxdgram sysctl limitation.\n",
+			    maxdgram - 4);
+			for (i = 0; sizes[i+1] != 0; i++) {
+				if ((int)maxdgram < sizes[i+1]) break;
+			}
+			asprintf(&options[OPT_BLKSIZE2].o_request,
+			    "%d", sizes[i]);
+		} else {
+			asprintf(&options[OPT_BLKSIZE2].o_request, "%d", size);
+		}
+	}
+	printf("Blocksize2 is now %s bytes.\n",
+	    options[OPT_BLKSIZE2].o_request);
+}
+
+static void
+setpacketdrop(int argc, char *argv[])
+{
+
+	if (argc != 1)
+		packetdroppercentage = atoi(argv[1]);
+
+	printf("Randomly %d in 100 packets will be dropped\n",
+	    packetdroppercentage);
+}