/*
 * 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.
 * 3. 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.
 *
 * @(#) Copyright (c) 1983, 1993 The Regents of the University of California.  All rights reserved.
 * @(#)main.c	8.1 (Berkeley) 6/6/93
 * $FreeBSD: src/usr.bin/tftp/main.c,v 1.8.2.3 2002/05/14 22:08:07 bsd Exp $
 */

/* 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/file.h>

#include <netinet/in.h>

#include <arpa/inet.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 "extern.h"

#define	MAXLINE		200
#define	TIMEOUT		5		/* secs between rexmt's */

struct	sockaddr_storage peeraddr;
int	f;
int	trace;
int	verbose;
int	connected;
char	mode[32];
char	line[MAXLINE];
int	margc;
#define	MAX_MARGV	20
char	*margv[MAX_MARGV];
jmp_buf	toplevel;
volatile int txrx_error;
void	intr(int);

void	get(int, char **);
void	help(int, char **);
void	modecmd(int, char **);
void	put(int, char **);
void	quit(int, char **);
void	setascii(int, char **);
void	setbinary(int, char **);
void	setpeer0(char *, const char *);
void	setpeer(int, char **);
void	setrexmt(int, char **);
void	settimeout(int, char **);
void	settrace(int, char **);
void	setverbose(int, char **);
void	status(int, char **);

static void command(void) __dead2;
static const char *command_prompt(void);

static void getusage(char *);
static void makeargv(void);
static void putusage(char *);
static void settftpmode(const char *);

#define HELPINDENT (sizeof("connect"))

struct cmd {
	const char *name;
	const char *help;
	void	(*handler)(int, char **);
};

const char	vhelp[] = "toggle verbose mode";
const char	thelp[] = "toggle packet tracing";
const char	chelp[] = "connect to remote tftp";
const char	qhelp[] = "exit tftp";
const char	hhelp[] = "print help information";
const char	shelp[] = "send file";
const char	rhelp[] = "receive file";
const char	mhelp[] = "set file transfer mode";
const char	sthelp[] = "show current status";
const char	xhelp[] = "set per-packet retransmission timeout";
const char	ihelp[] = "set total retransmission timeout";
const char	ashelp[] = "set mode to netascii";
const char	bnhelp[] = "set mode to octet";

struct cmd cmdtab[] = {
	{ "connect",	chelp,		setpeer },
	{ "mode",       mhelp,          modecmd },
	{ "put",	shelp,		put },
	{ "get",	rhelp,		get },
	{ "quit",	qhelp,		quit },
	{ "verbose",	vhelp,		setverbose },
	{ "trace",	thelp,		settrace },
	{ "status",	sthelp,		status },
	{ "binary",     bnhelp,         setbinary },
	{ "ascii",      ashelp,         setascii },
	{ "rexmt",	xhelp,		setrexmt },
	{ "timeout",	ihelp,		settimeout },
	{ "?",		hhelp,		help },
	{ .name = NULL }
};

struct	cmd *getcmd(char *);
char	*tail(char *);

int
main(int argc, char **argv)
{
	f = -1;
	strcpy(mode, "netascii");
	signal(SIGINT, intr);
	if (argc > 1) {
		if (setjmp(toplevel) != 0)
			exit(txrx_error);
		setpeer(argc, argv);
	}
	if (setjmp(toplevel) != 0)
		(void)putchar('\n');
	command();
}

char    hostname[MAXHOSTNAMELEN];

void
setpeer0(char *host, const char *port)
{
	struct addrinfo hints, *res0, *res;
	int error;
	struct sockaddr_storage ss;
	const char *cause = "unknown";

	if (connected) {
		close(f);
		f = -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 (!port)
		port = "tftp";
	error = getaddrinfo(host, port, &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;
		f = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
		if (f < 0) {
			cause = "socket";
			continue;
		}

		memset(&ss, 0, sizeof(ss));
		ss.ss_family = res->ai_family;
		ss.ss_len = res->ai_addrlen;
		if (bind(f, (struct sockaddr *)&ss, ss.ss_len) < 0) {
			cause = "bind";
			close(f);
			f = -1;
			continue;
		}

		break;
	}

	if (f < 0)
		warn("%s", cause);
	else {
		/* res->ai_addr <= sizeof(peeraddr) is guaranteed */
		memcpy(&peeraddr, 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);
}

void
setpeer(int argc, char **argv)
{

	if (argc < 2) {
		strcpy(line, "Connect ");
		printf("(to) ");
		fgets(&line[strlen(line)], sizeof line - strlen(line), stdin);
		makeargv();
		argc = margc;
		argv = margv;
	}
	if ((argc < 2) || (argc > 3)) {
		printf("usage: %s host-name [port]\n", argv[0]);
		return;
	}
	if (argc == 3)
		setpeer0(argv[1], NULL);
	else
		setpeer0(argv[1], argv[2]);
}

struct	modes {
	const char *m_name;
	const char *m_mode;
} modes[] = {
	{ "ascii",	"netascii" },
	{ "netascii",   "netascii" },
	{ "binary",     "octet" },
	{ "image",      "octet" },
	{ "octet",     "octet" },
/*      { "mail",       "mail" },       */
	{ NULL,		NULL }
};

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; p++) {
		printf("%s%s", sep, p->m_name);
		if (*sep == ' ')
			sep = " | ";
	}
	printf(" ]\n");
	return;
}

void
setbinary(int argc __unused, char **argv __unused)
{

	settftpmode("octet");
}

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).
 */
void
put(int argc, char **argv)
{
	int fd;
	int n;
	char *cp, *targ;

	if (argc < 2) {
		strcpy(line, "send ");
		printf("(file) ");
		fgets(&line[strlen(line)], sizeof line - strlen(line), stdin);
		makeargv();
		argc = margc;
		argv = margv;
	}
	if (argc < 2) {
		putusage(argv[0]);
		return;
	}
	targ = argv[argc - 1];
	if (strrchr(argv[argc - 1], ':')) {
		for (n = 1; n < argc - 1; n++)
			if (strchr(argv[n], ':')) {
				putusage(argv[0]);
				return;
			}
		cp = argv[argc - 1];
		targ = strrchr(cp, ':');
		*targ++ = 0;
		if (cp[0] == '[' && cp[strlen(cp) - 1] == ']') {
			cp[strlen(cp) - 1] = '\0';
			cp++;
		}
		setpeer0(cp, 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;
		}
		if (verbose)
			printf("putting %s to %s:%s [%s]\n",
				cp, hostname, targ, mode);
		xmitfile(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;
		}
		if (verbose)
			printf("putting %s to %s:%s [%s]\n",
				argv[n], hostname, targ, mode);
		xmitfile(fd, targ, mode);
	}
}

static void
putusage(char *s)
{
	printf("usage: %s file ... host:target, or\n", s);
	printf("       %s file ... target (when already connected)\n", s);
}

/*
 * Receive file(s).
 */
void
get(int argc, char **argv)
{
	int fd;
	int n;
	char *cp;
	char *src;

	if (argc < 2) {
		strcpy(line, "get ");
		printf("(files) ");
		fgets(&line[strlen(line)], sizeof line - strlen(line), stdin);
		makeargv();
		argc = margc;
		argv = margv;
	}
	if (argc < 2) {
		getusage(argv[0]);
		return;
	}
	if (!connected) {
		for (n = 1; n < argc ; n++)
			if (strrchr(argv[n], ':') == 0) {
				getusage(argv[0]);
				return;
			}
	}
	for (n = 1; n < argc ; n++) {
		src = strrchr(argv[n], ':');
		if (src == NULL)
			src = argv[n];
		else {
			*src++ = 0;
			cp = argv[n];
			if (cp[0] == '[' && cp[strlen(cp) - 1] == ']') {
				cp[strlen(cp) - 1] = '\0';
				cp++;
			}
			setpeer0(cp, 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(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(fd, src, mode);
	}
}

static void
getusage(char *s)
{
	printf("usage: %s host:file host:file ... file, or\n", s);
	printf("       %s file file ... file if connected\n", s);
}

int	rexmtval = TIMEOUT;

void
setrexmt(int argc, char **argv)
{
	int t;

	if (argc < 2) {
		strcpy(line, "Rexmt-timeout ");
		printf("(value) ");
		fgets(&line[strlen(line)], sizeof line - strlen(line), stdin);
		makeargv();
		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]);
	else
		rexmtval = t;
}

int	maxtimeout = 5 * TIMEOUT;

void
settimeout(int argc, char **argv)
{
	int t;

	if (argc < 2) {
		strcpy(line, "Maximum-timeout ");
		printf("(value) ");
		fgets(&line[strlen(line)], sizeof line - strlen(line), stdin);
		makeargv();
		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]);
	else
		maxtimeout = t;
}

void
status(int argc __unused, char **argv __unused)
{
	if (connected)
		printf("Connected to %s.\n", hostname);
	else
		printf("Not connected.\n");
	printf("Mode: %s Verbose: %s Tracing: %s\n", mode,
		verbose ? "on" : "off", trace ? "on" : "off");
	printf("Rexmt-interval: %d seconds, Max-timeout: %d seconds\n",
		rexmtval, maxtimeout);
}

void
intr(int signo __unused)
{
	signal(SIGALRM, SIG_IGN);
	alarm(0);
	longjmp(toplevel, -1);
}

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;

	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(txrx_error);
			len = (num > MAXLINE) ? MAXLINE : num;
			memcpy(line, bp, len);
			line[len] = '\0';
			history(hist, &he, H_ENTER, bp);
		} else {
			if (fgets(line, sizeof line , stdin) == 0) {
				if (feof(stdin)) {
					exit(txrx_error);
				} else {
					continue;
				}
			}
		}
		if ((cp = strchr(line, '\n')))
			*cp = '\0';
		if (line[0] == 0)
			continue;
		makeargv();
		if (margc == 0)
			continue;
		c = getcmd(margv[0]);
		if (c == (struct cmd *)-1) {
			printf("?Ambiguous command\n");
			continue;
		}
		if (c == NULL) {
			printf("?Invalid command\n");
			continue;
		}
		(*c->handler)(margc, margv);
	}
}

struct cmd *
getcmd(char *name)
{
	const char *p;
	char *q;
	struct cmd *c, *found;
	int nmatches, longest;

	longest = 0;
	nmatches = 0;
	found = NULL;
	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(void)
{
	char *cp;
	char **argp = margv;

	margc = 0;
	if ((cp = strchr(line, '\n')))
		*cp = '\0';
	for (cp = line; margc < MAX_MARGV -1 && *cp;) {
		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++ = NULL;
}

void
quit(int argc __unused, char **argv __unused)
{

	exit(txrx_error);
}

/*
 * Help command.
 */
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);
		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 == NULL)
			printf("?Invalid help command %s\n", arg);
		else
			printf("%s\n", c->help);
	}
}

void
settrace(int argc __unused, char **argv __unused)
{
	trace = !trace;
	printf("Packet tracing %s.\n", trace ? "on" : "off");
}

void
setverbose(int argc __unused, char **argv __unused)
{
	verbose = !verbose;
	printf("Verbose mode %s.\n", verbose ? "on" : "off");
}