// telnetd.c

//

// © Portions Copyright (c) Symbian Software Ltd 2007-2008. All rights reserved.

//

/*

 * Copyright (c) 1989, 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.

 */

#include "telnetd.h"

#ifdef __SYMBIAN32__

#include "dummy.h"

extern void mini_inetd (int port);

#endif

#ifndef __SYMBIAN32__

__RCSID("$Heimdal: telnetd.c,v 1.69.6.1 2004/03/22 18:17:25 lha Exp $"

        "$NetBSD: telnetd.c,v 1.3 2004/04/02 14:59:47 lha Exp $");

#endif

#ifdef _SC_CRAY_SECURE_SYS

#include <sys/sysv.h>

#include <sys/secdev.h>

#include <sys/secparm.h>

#include <sys/usrv.h>

int	secflag;

char	tty_dev[16];

struct	secdev dv;

struct	sysv sysv;

struct	socksec ss;

#endif	/* _SC_CRAY_SECURE_SYS */

#ifdef AUTHENTICATION

int	auth_level = 0;

#endif

#ifdef __SYMBIAN32__

#ifdef __WINSCW__

#pragma warn_unusedarg off

#endif

#endif

extern	int utmp_len;

int	registerd_host_only = 0;

/**moved from roken.h**/

#define roken_getservbyname(x,y) getservbyname(x,y)

#define roken_openlog(a,b,c) openlog(a,b,c)

#define roken_getsockname(a,b,c) getsockname(a,b,c)

#undef NOERROR

#ifdef	STREAMSPTY

# include <stropts.h>

# include <termios.h>

#ifdef HAVE_SYS_UIO_H

#include <sys/uio.h>

#endif /* HAVE_SYS_UIO_H */

#ifdef HAVE_SYS_STREAM_H

#include <sys/stream.h>

#endif

#ifdef _AIX

#include <sys/termio.h>

#endif

# ifdef HAVE_SYS_STRTTY_H

# include <sys/strtty.h>

# endif

# ifdef HAVE_SYS_STR_TTY_H

# include <sys/str_tty.h>

# endif

/* make sure we don't get the bsd version */

/* what is this here for? solaris? /joda */

# ifdef HAVE_SYS_TTY_H

# include "/usr/include/sys/tty.h"

# endif

# ifdef HAVE_SYS_PTYVAR_H

# include <sys/ptyvar.h>

# endif

/*

 * Because of the way ptyibuf is used with streams messages, we need

 * ptyibuf+1 to be on a full-word boundary.  The following wierdness

 * is simply to make that happen.

 */

long	ptyibufbuf[BUFSIZ/sizeof(long)+1];

char	*ptyibuf = ((char *)&ptyibufbuf[1])-1;

char	*ptyip = ((char *)&ptyibufbuf[1])-1;

char	ptyibuf2[BUFSIZ];

unsigned char ctlbuf[BUFSIZ];

struct	strbuf strbufc, strbufd;

int readstream(int, char*, int);

#else	/* ! STREAMPTY */

/*

 * I/O data buffers,

 * pointers, and counters.

 */

char	ptyibuf[BUFSIZ], *ptyip = ptyibuf;

char	ptyibuf2[BUFSIZ];

#endif /* ! STREAMPTY */

int	hostinfo = 1;			/* do we print login banner? */

#ifdef	_CRAY

extern int      newmap; /* nonzero if \n maps to ^M^J */

int	lowpty = 0, highpty;	/* low, high pty numbers */

#endif /* CRAY */

int debug = 1;

int keepalive = 1;

char *progname;

static void usage (void);

/*

 * The string to pass to getopt().  We do it this way so

 * that only the actual options that we support will be

 * passed off to getopt().

 */

char valid_opts[] = "Bd:hklnS:u:UL:y"

#ifdef AUTHENTICATION

		    "a:X:z"

#endif

#ifdef DIAGNOSTICS

		    "D:"

#endif

#ifdef _CRAY

		    "r:"

#endif

		    ;

static void doit(struct sockaddr*, int);

#ifdef ENCRYPTION

extern int des_check_key;

#endif

extern int getConnectionUp(void);

int

main(int argc, char **argv)

{

    struct sockaddr_storage __ss;

    struct sockaddr *sa = (struct sockaddr *)&__ss;

    int on = 1;

    socklen_t sa_size;

    int ch;

#if	defined(IPPROTO_IP) && defined(IP_TOS)

    int tos = -1;

#endif

#ifdef ENCRYPTION

    des_check_key = 1;	/* Kludge for Mac NCSA telnet 2.6 /bg */

#endif

	pfrontp = pbackp = ptyobuf;

    netip = netibuf;

    nfrontp = nbackp = netobuf;

#ifdef __SYMBIAN32__

	if( getConnectionUp() < 0) exit(1);

#endif	

    setprogname(argv[0]);

    progname = *argv;

#ifdef ENCRYPTION

    nclearto = 0;

#endif

#ifdef _CRAY

    /*

     * Get number of pty's before trying to process options,

     * which may include changing pty range.

     */

    highpty = getnpty();

#endif /* CRAY */

    if (argc == 2 && strcmp(argv[1], "--version") == 0) {

#ifndef __SYMBIAN32__

	print_version(NULL); 

#endif //__SYMBIAN32__

	exit(0);

    }

    while ((ch = getopt(argc, argv, valid_opts)) != -1) {

	switch(ch) {

#ifdef	AUTHENTICATION

	case 'a':

	    /*

	     * Check for required authentication level

	     */

	    if (strcmp(optarg, "debug") == 0) {

		auth_debug_mode = 1;

	    } else if (strcasecmp(optarg, "none") == 0) {

		auth_level = 0;

	    } else if (strcasecmp(optarg, "otp") == 0) {

		auth_level = 0;

		require_otp = 1;

	    } else if (strcasecmp(optarg, "other") == 0) {

		auth_level = AUTH_OTHER;

	    } else if (strcasecmp(optarg, "user") == 0) {

		auth_level = AUTH_USER;

	    } else if (strcasecmp(optarg, "valid") == 0) {

		auth_level = AUTH_VALID;

	    } else if (strcasecmp(optarg, "off") == 0) {

		/*

		 * This hack turns off authentication

		 */

		auth_level = -1;

	    } else {

		fprintf(stderr,

			"telnetd: unknown authorization level for -a\n");

	    }

	    break;

#endif	/* AUTHENTICATION */

	case 'B': /* BFTP mode is not supported any more */

	    break;

	case 'd':

	    if (strcmp(optarg, "ebug") == 0) {

		debug++;

		break;

	    }

	    usage();

	    /* NOTREACHED */

	    break;

#ifdef DIAGNOSTICS

	case 'D':

	    /*

	     * Check for desired diagnostics capabilities.

	     */

	    if (!strcmp(optarg, "report")) {

		diagnostic |= TD_REPORT|TD_OPTIONS;

	    } else if (!strcmp(optarg, "exercise")) {

		diagnostic |= TD_EXERCISE;

	    } else if (!strcmp(optarg, "netdata")) {

		diagnostic |= TD_NETDATA;

	    } else if (!strcmp(optarg, "ptydata")) {

		diagnostic |= TD_PTYDATA;

	    } else if (!strcmp(optarg, "options")) {

		diagnostic |= TD_OPTIONS;

	    } else {

		usage();

		/* NOT REACHED */

	    }

	    break;

#endif /* DIAGNOSTICS */

	case 'h':

	    hostinfo = 0;

	    break;

	case 'k': /* Linemode is not supported any more */

	case 'l':

	    break;

	case 'n':

	    keepalive = 0;

	    break;

#ifdef _CRAY

	case 'r':

	    {

		char *strchr();

		char *c;

		/*

		 * Allow the specification of alterations

		 * to the pty search range.  It is legal to

		 * specify only one, and not change the

		 * other from its default.

		 */

		c = strchr(optarg, '-');

		if (c) {

		    *c++ = '\0';

		    highpty = atoi(c);

		}

		if (*optarg != '\0')

		    lowpty = atoi(optarg);

		if ((lowpty > highpty) || (lowpty < 0) ||

		    (highpty > 32767)) {

		    usage();

		    /* NOT REACHED */

		}

		break;

	    }

#endif	/* CRAY */

	case 'S':

#ifdef	HAVE_PARSETOS

	    if ((tos = parsetos(optarg, "tcp")) < 0)

		fprintf(stderr, "%s%s%s\n",

			"telnetd: Bad TOS argument '", optarg,

			"'; will try to use default TOS");

#else

	    fprintf(stderr, "%s%s\n", "TOS option unavailable; ",

		    "-S flag not supported\n");

#endif

	    break;

	case 'u': {

	    char *eptr;

	    utmp_len = strtol(optarg, &eptr, 0);

	    if (optarg == eptr)

		fprintf(stderr, "telnetd: unknown utmp len (%s)\n", optarg);

	    break;

	}

	case 'U':

	    registerd_host_only = 1;

	    break;

#ifdef	AUTHENTICATION

	case 'X':

	    /*

	     * Check for invalid authentication types

	     */

	    auth_disable_name(optarg);

	    break;

#endif

	case 'y':

	    no_warn = 1;

	    break;

#ifdef AUTHENTICATION

	case 'z':

	    log_unauth = 1;

	    break;

#endif	/* AUTHENTICATION */

	case 'L':

	    new_login = optarg;

	    break;

	default:

	    fprintf(stderr, "telnetd: %c: unknown option\n", ch);

	    /* FALLTHROUGH */

	case '?':

	    usage();

	    /* NOTREACHED */

	}

    }

    argc -= optind;

    argv += optind;

    if (debug) {

	int port = 0;

	struct servent *sp;

	if (argc > 1) {

	    usage ();

	} else if (argc == 1) {

	    sp = (struct servent*)roken_getservbyname (*argv, "tcp");

	    if (sp)

		port = sp->s_port;

	    else

		port = htons(atoi(*argv));

	} else {

#ifdef 	__SYMBIAN32__

		port = htons(atoi("23"));		

#else

#ifdef KRB5

	    port = krb5_getportbyname (NULL, "telnet", "tcp", 23);

#else

	    port = k_getportbyname("telnet", "tcp", htons(23));

#endif

#endif //__SYMBIAN32__

	}

	mini_inetd (port);

    } else if (argc > 0) {

	usage();

	/* NOT REACHED */

    }

#ifdef _SC_CRAY_SECURE_SYS

    secflag = sysconf(_SC_CRAY_SECURE_SYS);

    /*

     *	Get socket's security label

     */

    if (secflag)  {

	socklen_t szss = sizeof(ss);

	int sock_multi;

	socklen_t szi = sizeof(int);

	memset(&dv, 0, sizeof(dv));

	if (getsysv(&sysv, sizeof(struct sysv)) != 0) 

	    fatalperror(net, "getsysv");

	/*

	 *	Get socket security label and set device values

	 *	   {security label to be set on ttyp device}

	 */

#ifdef SO_SEC_MULTI			/* 8.0 code */

	if ((getsockopt(0, SOL_SOCKET, SO_SECURITY,

			(void *)&ss, &szss) < 0) ||

	    (getsockopt(0, SOL_SOCKET, SO_SEC_MULTI,

			(void *)&sock_multi, &szi) < 0)) 

	    fatalperror(net, "getsockopt");

	else {

	    dv.dv_actlvl = ss.ss_actlabel.lt_level;

	    dv.dv_actcmp = ss.ss_actlabel.lt_compart;

	    if (!sock_multi) {

		dv.dv_minlvl = dv.dv_maxlvl = dv.dv_actlvl;

		dv.dv_valcmp = dv.dv_actcmp;

	    } else {

		dv.dv_minlvl = ss.ss_minlabel.lt_level;

		dv.dv_maxlvl = ss.ss_maxlabel.lt_level;

		dv.dv_valcmp = ss.ss_maxlabel.lt_compart;

	    }

	    dv.dv_devflg = 0;

	}

#else /* SO_SEC_MULTI */		/* 7.0 code */

	if (getsockopt(0, SOL_SOCKET, SO_SECURITY,

		       (void *)&ss, &szss) >= 0) {

	    dv.dv_actlvl = ss.ss_slevel;

	    dv.dv_actcmp = ss.ss_compart;

	    dv.dv_minlvl = ss.ss_minlvl;

	    dv.dv_maxlvl = ss.ss_maxlvl;

	    dv.dv_valcmp = ss.ss_maxcmp;

	}

#endif /* SO_SEC_MULTI */

    }

#endif	/* _SC_CRAY_SECURE_SYS */

    roken_openlog("telnetd", LOG_PID | LOG_ODELAY, LOG_DAEMON);

    sa_size = sizeof (__ss);

    if (getpeername(STDIN_FILENO, sa, &sa_size) < 0) {

	fprintf(stderr, "%s: ", progname);

	perror("getpeername");

	_exit(1);

    }

    if (keepalive &&

	setsockopt(STDIN_FILENO, SOL_SOCKET, SO_KEEPALIVE,

		   (void *)&on, sizeof (on)) < 0) {		 

#ifndef __SYMBIAN32__		     

	syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m");

#endif

	;

    }

#if	defined(IPPROTO_IP) && defined(IP_TOS) && defined(HAVE_SETSOCKOPT)

    {

# ifdef HAVE_GETTOSBYNAME

	struct tosent *tp;

	if (tos < 0 && (tp = gettosbyname("telnet", "tcp")))

	    tos = tp->t_tos;

# endif

	if (tos < 0)

	    tos = 020;	/* Low Delay bit */

	if (tos

	    && sa->sa_family == AF_INET

	    && (setsockopt(STDIN_FILENO, IPPROTO_IP, IP_TOS,

			   (void *)&tos, sizeof(tos)) < 0)

	    && (errno != ENOPROTOOPT) )

	    syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");

    }

#endif	/* defined(IPPROTO_IP) && defined(IP_TOS) */

    net = STDIN_FILENO;

    doit(sa, sa_size);

    /* NOTREACHED */

    return 0;

}  /* end of main */

static void

usage(void)

{

    fprintf(stderr, "Usage: telnetd");

#ifdef	AUTHENTICATION

    fprintf(stderr, " [-a (debug|other|otp|user|valid|off|none)]\n\t");

#endif

    fprintf(stderr, " [-debug]");

#ifdef DIAGNOSTICS

    fprintf(stderr, " [-D (options|report|exercise|netdata|ptydata)]\n\t");

#endif

#ifdef	AUTHENTICATION

    fprintf(stderr, " [-edebug]");

#endif

    fprintf(stderr, " [-h]");

    fprintf(stderr, " [-L login]");

    fprintf(stderr, " [-n]");

#ifdef	_CRAY

    fprintf(stderr, " [-r[lowpty]-[highpty]]");

#endif

    fprintf(stderr, "\n\t");

#ifdef	HAVE_GETTOSBYNAME

    fprintf(stderr, " [-S tos]");

#endif