main.c

unix下tftp服务器源码

/*	$OpenBSD: main.c,v 1.4 1997/01/17 07:13:30 millert Exp $	*/
/*	$NetBSD: main.c,v 1.6 1995/05/21 16:54:10 mycroft Exp $	*/

/*
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 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.
 */

#include "tftpsubs.h"

#ifndef lint
static const char *copyright UNUSED =
"@(#) Copyright (c) 1983, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
/* static char sccsid[] = "@(#)main.c	8.1 (Berkeley) 6/6/93"; */
/* static char rcsid[] = "$OpenBSD: main.c,v 1.4 1997/01/17 07:13:30 millert Exp $"; */
static const char *rcsid UNUSED =
 "tftp-hpa $Id: main.c,v 1.21 2004/01/08 20:47:00 hpa Exp $";
#endif /* not lint */

/* Many bug fixes are from Jim Guyton <guyton@rand-unix> */

/*
 * TFTP User Program -- Command Interface.
 */
#include <sys/file.h>
#include <ctype.h>
#include <netdb.h>
#ifdef WITH_READLINE
#include <readline/readline.h>
#ifdef HAVE_READLINE_HISTORY_H
#include <readline/history.h>
#endif
#endif

#include "extern.h"

#define	TIMEOUT		5		/* secs between rexmt's */
#define	LBUFLEN		200		/* size of input buffer */

struct modes {
  const char *m_name;
  const char *m_mode;
  int m_openflags;
};

static const struct modes modes[] = {
	{ "netascii", "netascii", O_TEXT },
	{ "ascii",    "netascii", O_TEXT },
	{ "octet",    "octet",    O_BINARY },
	{ "binary",   "octet",    O_BINARY },
	{ "image",    "octet",    O_BINARY },
	{ 0, 0, 0 }
};
#define MODE_OCTET    (&modes[2])
#define MODE_NETASCII (&modes[0])
#define MODE_DEFAULT  MODE_NETASCII

struct	sockaddr_in peeraddr;
int	f;
u_short port;
int	trace;
int	verbose;
int	connected;
const struct modes *mode;
#ifdef WITH_READLINE
char   *line = NULL;
#else
char	line[LBUFLEN];
#endif
int	margc;
char	*margv[20];
const char *prompt = "tftp> ";
sigjmp_buf	toplevel;
void	intr(int);
struct	servent *sp;

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	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);

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

#define HELPINDENT (sizeof("connect"))

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

struct cmd cmdtab[] = {
  { "connect",
    "connect to remote tftp",
    setpeer },
  { "mode",
    "set file transfer mode",
    modecmd },
  { "put",
    "send file",
    put },
  { "get",
    "receive file",
    get },
  { "quit",
    "exit tftp",
    quit },
  { "verbose",
    "toggle verbose mode",
    setverbose },
  { "trace",
    "toggle packet tracing",
    settrace },
  { "status",
    "show current status",
    status },
  { "binary",
    "set mode to octet",
    setbinary },
  { "ascii",
    "set mode to netascii",
    setascii },
  { "rexmt",
    "set per-packet transmission timeout",
    setrexmt },
  { "timeout",
    "set total retransmission timeout",
    settimeout },
  { "?",
    "print help information",
    help },
  { "help",
    "print help information",
    help },
  { 0, 0, 0 }
};

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

char *xstrdup(const char *);

const char *program;

static inline void usage(int errcode)
{
  fprintf(stderr, "Usage: %s [-v][-m mode] [host [port]] [-c command]\n", program);
  exit(errcode);
}

int
main(int argc, char *argv[])
{
  struct sockaddr_in s_in;
  int arg;
  static int pargc, peerargc;
  static int iscmd = 0;
  char **pargv;
  const char *optx;
  char *peerargv[3];

  program = argv[0];

  mode = MODE_DEFAULT;

  peerargv[0] = argv[0];
  peerargc = 1;

  for ( arg = 1 ; !iscmd && arg < argc ; arg++ ) {
    if ( argv[arg][0] == '-' ) {
      for ( optx = &argv[arg][1] ; *optx ; optx++ ) {
	switch ( *optx ) {
	case 'v':
	  verbose = 1;
	  break;
	case 'V':
	  /* Print version and configuration to stdout and exit */
	  printf("%s\n", TFTP_CONFIG_STR);
	  exit(0);
	case 'm':
	  if ( ++arg >= argc )
	    usage(EX_USAGE);
	  {
	    const struct modes *p;
	    
	    for ( p = modes ; p->m_name ; p++ ) {
	      if (!strcmp(argv[arg], p->m_name))
		break;
	    }
	    if (p->m_name) {
	      settftpmode(p);
	    } else {
	      fprintf(stderr, "%s: invalid mode: %s\n", argv[0], argv[arg]);
	      exit(EX_USAGE);
	    }
	  }
	  break;
	case 'c':
	  iscmd = 1;
	  break;
	case 'h':
	default:
	  usage(*optx == 'h' ? 0 : EX_USAGE);
	}
      }
    } else {
      if ( peerargc >= 3 )
	usage(EX_USAGE);

      peerargv[peerargc++] = argv[arg];
    }
  }
  
  pargv = argv + arg;
  pargc = argc - arg;
  
  sp = getservbyname("tftp", "udp");
  if (sp == 0) {
    /* Use canned values */
    if (verbose)
      fprintf(stderr, "tftp: tftp/udp: unknown service, faking it...\n");
    sp = xmalloc(sizeof(struct servent));
    sp->s_name    = (char *)"tftp";
    sp->s_aliases = NULL;
    sp->s_port    = htons(IPPORT_TFTP);
    sp->s_proto   = (char *)"udp";
  }
  port = sp->s_port;		/* Default port */
  f = socket(AF_INET, SOCK_DGRAM, 0);
  if (f < 0) {
    perror("tftp: socket");
    exit(EX_OSERR);
  }
  bzero((char *)&s_in, sizeof (s_in));
  s_in.sin_family = AF_INET;
  if (bind(f, (struct sockaddr *)&s_in, sizeof (s_in)) < 0) {
    perror("tftp: bind");
    exit(EX_OSERR);
  }
  bsd_signal(SIGINT, intr);

  if ( peerargc ) {
    /* Set peer */
    if (sigsetjmp(toplevel,1) != 0)
      exit(EX_NOHOST);
    setpeer(peerargc, peerargv);
  }

  if ( iscmd && pargc ) {
    /* -c specified; execute command and exit */
    struct cmd *c;
    
    if (sigsetjmp(toplevel,1) != 0)
      exit(EX_UNAVAILABLE);
    
    c = getcmd(pargv[0]);
    if ( c == (struct cmd *)-1 || c == (struct cmd *)0 ) {
      fprintf(stderr, "%s: invalid command: %s\n", argv[0], pargv[1]);
      exit(EX_USAGE);
    }	
    (*c->handler)(pargc, pargv);
    exit(0);
  }
  if (sigsetjmp(toplevel,1) != 0)
    (void)putchar('\n');
  
#ifdef WITH_READLINE
#ifdef HAVE_READLINE_HISTORY_H
  using_history();
#endif
#endif
  
  command();
  
  return 0;		/* Never reached */
}

char    *hostname;

/* Called when a command is incomplete; modifies
   the global variable "line" */
static void
getmoreargs(const char *partial, const char *mprompt)
{
#ifdef WITH_READLINE
  char *eline;
  int len, elen;
  
  len = strlen(partial);
  eline = readline(mprompt);
  if (!eline)
	  exit(0);		/* EOF */
  
  elen = strlen(eline);

  if (line)
	  free(line);
  line = xmalloc(len+elen+1);
  strcpy(line, partial);
  strcpy(line+len, eline);
  free(eline);

#ifdef HAVE_READLINE_HISTORY_H
  add_history(line);
#endif
#else
  int len = strlen(partial);
  
  strcpy(line, partial);
  fputs(mprompt, stdout);
  if ( fgets(line+len, LBUFLEN-len, stdin) == 0 )
	  if ( feof(stdin) )
		  exit(0);	/* EOF */
#endif
}

void
setpeer(int argc, char *argv[])
{
	struct hostent *host;

	if (argc < 2) {
		getmoreargs("connect ", "(to) ");
		makeargv();
		argc = margc;
		argv = margv;
	}
	if ((argc < 2) || (argc > 3)) {
		printf("usage: %s host-name [port]\n", argv[0]);
		return;
	}

	host = gethostbyname(argv[1]);
	if (host == 0) {
		connected = 0;
		printf("%s: unknown host\n", argv[1]);
		return;
	}
	peeraddr.sin_family = host->h_addrtype;
	bcopy(host->h_addr, &peeraddr.sin_addr, host->h_length);
	hostname = xstrdup(host->h_name);

	port = sp->s_port;
	if (argc == 3) {
		struct servent *usp;
		usp = getservbyname(argv[2], "udp");
		if ( usp ) {
			port = usp->s_port;
		} else {
			unsigned long myport;
			char *ep;
			myport = strtoul(argv[2], &ep, 10);
			if (*ep || myport > 65535UL) {
				printf("%s: bad port number\n", argv[2]);
				connected = 0;
				return;
			}
			port = htons((u_short)myport);
		}
	}

	if (verbose) {
		printf("Connected to %s (%s), port %u\n",
		       hostname, inet_ntoa(peeraddr.sin_addr),
		       (unsigned int)ntohs(port));
	}
	connected = 1;
}

void
modecmd(int argc, char *argv[])
{
	const struct modes *p;
	const char *sep;

	if (argc < 2) {
		printf("Using %s mode to transfer files.\n", mode->m_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);
			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");