telnetd.c revision 102644 
1/*
2 * Copyright (c) 1989, 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 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "telnetd.h"
35
36RCSID("$Id: telnetd.c,v 1.69 2002/08/23 19:28:01 assar Exp $");
37
38#ifdef _SC_CRAY_SECURE_SYS
39#include <sys/sysv.h>
40#include <sys/secdev.h>
41#include <sys/secparm.h>
42#include <sys/usrv.h>
43int	secflag;
44char	tty_dev[16];
45struct	secdev dv;
46struct	sysv sysv;
47struct	socksec ss;
48#endif	/* _SC_CRAY_SECURE_SYS */
49
50#ifdef AUTHENTICATION
51int	auth_level = 0;
52#endif
53
54extern	int utmp_len;
55int	registerd_host_only = 0;
56
57#undef NOERROR
58
59#ifdef	STREAMSPTY
60# include <stropts.h>
61# include <termios.h>
62#ifdef HAVE_SYS_UIO_H
63#include <sys/uio.h>
64#endif /* HAVE_SYS_UIO_H */
65#ifdef HAVE_SYS_STREAM_H
66#include <sys/stream.h>
67#endif
68
69#ifdef _AIX
70#include <sys/termio.h>
71#endif
72# ifdef HAVE_SYS_STRTTY_H
73# include <sys/strtty.h>
74# endif
75# ifdef HAVE_SYS_STR_TTY_H
76# include <sys/str_tty.h>
77# endif
78/* make sure we don't get the bsd version */
79/* what is this here for? solaris? /joda */
80# ifdef HAVE_SYS_TTY_H
81# include "/usr/include/sys/tty.h"
82# endif
83# ifdef HAVE_SYS_PTYVAR_H
84# include <sys/ptyvar.h>
85# endif
86
87/*
88 * Because of the way ptyibuf is used with streams messages, we need
89 * ptyibuf+1 to be on a full-word boundary.  The following wierdness
90 * is simply to make that happen.
91 */
92long	ptyibufbuf[BUFSIZ/sizeof(long)+1];
93char	*ptyibuf = ((char *)&ptyibufbuf[1])-1;
94char	*ptyip = ((char *)&ptyibufbuf[1])-1;
95char	ptyibuf2[BUFSIZ];
96unsigned char ctlbuf[BUFSIZ];
97struct	strbuf strbufc, strbufd;
98
99int readstream(int, char*, int);
100
101#else	/* ! STREAMPTY */
102
103/*
104 * I/O data buffers,
105 * pointers, and counters.
106 */
107char	ptyibuf[BUFSIZ], *ptyip = ptyibuf;
108char	ptyibuf2[BUFSIZ];
109
110#endif /* ! STREAMPTY */
111
112int	hostinfo = 1;			/* do we print login banner? */
113
114#ifdef	_CRAY
115extern int      newmap; /* nonzero if \n maps to ^M^J */
116int	lowpty = 0, highpty;	/* low, high pty numbers */
117#endif /* CRAY */
118
119int debug = 0;
120int keepalive = 1;
121char *progname;
122
123static void usage (void);
124
125/*
126 * The string to pass to getopt().  We do it this way so
127 * that only the actual options that we support will be
128 * passed off to getopt().
129 */
130char valid_opts[] = "Bd:hklnS:u:UL:y"
131#ifdef AUTHENTICATION
132		    "a:X:z"
133#endif
134#ifdef DIAGNOSTICS
135		    "D:"
136#endif
137#ifdef _CRAY
138		    "r:"
139#endif
140		    ;
141
142static void doit(struct sockaddr*, int);
143
144#ifdef ENCRYPTION
145extern int des_check_key;
146#endif
147
148int
149main(int argc, char **argv)
150{
151    struct sockaddr_storage __ss;
152    struct sockaddr *sa = (struct sockaddr *)&__ss;
153    int on = 1;
154    socklen_t sa_size;
155    int ch;
156#if	defined(IPPROTO_IP) && defined(IP_TOS)
157    int tos = -1;
158#endif
159#ifdef ENCRYPTION
160    des_check_key = 1;	/* Kludge for Mac NCSA telnet 2.6 /bg */
161#endif
162    pfrontp = pbackp = ptyobuf;
163    netip = netibuf;
164    nfrontp = nbackp = netobuf;
165
166    progname = *argv;
167#ifdef ENCRYPTION
168    nclearto = 0;
169#endif
170
171#ifdef _CRAY
172    /*
173     * Get number of pty's before trying to process options,
174     * which may include changing pty range.
175     */
176    highpty = getnpty();
177#endif /* CRAY */
178
179    if (argc == 2 && strcmp(argv[1], "--version") == 0) {
180	print_version(NULL);
181	exit(0);
182    }
183
184    while ((ch = getopt(argc, argv, valid_opts)) != -1) {
185	switch(ch) {
186
187#ifdef	AUTHENTICATION
188	case 'a':
189	    /*
190	     * Check for required authentication level
191	     */
192	    if (strcmp(optarg, "debug") == 0) {
193		auth_debug_mode = 1;
194	    } else if (strcasecmp(optarg, "none") == 0) {
195		auth_level = 0;
196	    } else if (strcasecmp(optarg, "otp") == 0) {
197		auth_level = 0;
198		require_otp = 1;
199	    } else if (strcasecmp(optarg, "other") == 0) {
200		auth_level = AUTH_OTHER;
201	    } else if (strcasecmp(optarg, "user") == 0) {
202		auth_level = AUTH_USER;
203	    } else if (strcasecmp(optarg, "valid") == 0) {
204		auth_level = AUTH_VALID;
205	    } else if (strcasecmp(optarg, "off") == 0) {
206		/*
207		 * This hack turns off authentication
208		 */
209		auth_level = -1;
210	    } else {
211		fprintf(stderr,
212			"telnetd: unknown authorization level for -a\n");
213	    }
214	    break;
215#endif	/* AUTHENTICATION */
216
217	case 'B': /* BFTP mode is not supported any more */
218	    break;
219	case 'd':
220	    if (strcmp(optarg, "ebug") == 0) {
221		debug++;
222		break;
223	    }
224	    usage();
225	    /* NOTREACHED */
226	    break;
227
228#ifdef DIAGNOSTICS
229	case 'D':
230	    /*
231	     * Check for desired diagnostics capabilities.
232	     */
233	    if (!strcmp(optarg, "report")) {
234		diagnostic |= TD_REPORT|TD_OPTIONS;
235	    } else if (!strcmp(optarg, "exercise")) {
236		diagnostic |= TD_EXERCISE;
237	    } else if (!strcmp(optarg, "netdata")) {
238		diagnostic |= TD_NETDATA;
239	    } else if (!strcmp(optarg, "ptydata")) {
240		diagnostic |= TD_PTYDATA;
241	    } else if (!strcmp(optarg, "options")) {
242		diagnostic |= TD_OPTIONS;
243	    } else {
244		usage();
245		/* NOT REACHED */
246	    }
247	    break;
248#endif /* DIAGNOSTICS */
249
250
251	case 'h':
252	    hostinfo = 0;
253	    break;
254
255	case 'k': /* Linemode is not supported any more */
256	case 'l':
257	    break;
258
259	case 'n':
260	    keepalive = 0;
261	    break;
262
263#ifdef _CRAY
264	case 'r':
265	    {
266		char *strchr();
267		char *c;
268
269		/*
270		 * Allow the specification of alterations
271		 * to the pty search range.  It is legal to
272		 * specify only one, and not change the
273		 * other from its default.
274		 */
275		c = strchr(optarg, '-');
276		if (c) {
277		    *c++ = '\0';
278		    highpty = atoi(c);
279		}
280		if (*optarg != '\0')
281		    lowpty = atoi(optarg);
282		if ((lowpty > highpty) || (lowpty < 0) ||
283		    (highpty > 32767)) {
284		    usage();
285		    /* NOT REACHED */
286		}
287		break;
288	    }
289#endif	/* CRAY */
290
291	case 'S':
292#ifdef	HAVE_PARSETOS
293	    if ((tos = parsetos(optarg, "tcp")) < 0)
294		fprintf(stderr, "%s%s%s\n",
295			"telnetd: Bad TOS argument '", optarg,
296			"'; will try to use default TOS");
297#else
298	    fprintf(stderr, "%s%s\n", "TOS option unavailable; ",
299		    "-S flag not supported\n");
300#endif
301	    break;
302
303	case 'u': {
304	    char *eptr;
305
306	    utmp_len = strtol(optarg, &eptr, 0);
307	    if (optarg == eptr)
308		fprintf(stderr, "telnetd: unknown utmp len (%s)\n", optarg);
309	    break;
310	}
311
312	case 'U':
313	    registerd_host_only = 1;
314	    break;
315
316#ifdef	AUTHENTICATION
317	case 'X':
318	    /*
319	     * Check for invalid authentication types
320	     */
321	    auth_disable_name(optarg);
322	    break;
323#endif
324	case 'y':
325	    no_warn = 1;
326	    break;
327#ifdef AUTHENTICATION
328	case 'z':
329	    log_unauth = 1;
330	    break;
331
332#endif	/* AUTHENTICATION */
333
334	case 'L':
335	    new_login = optarg;
336	    break;
337
338	default:
339	    fprintf(stderr, "telnetd: %c: unknown option\n", ch);
340	    /* FALLTHROUGH */
341	case '?':
342	    usage();
343	    /* NOTREACHED */
344	}
345    }
346
347    argc -= optind;
348    argv += optind;
349
350    if (debug) {
351	int port = 0;
352	struct servent *sp;
353
354	if (argc > 1) {
355	    usage ();
356	} else if (argc == 1) {
357	    sp = roken_getservbyname (*argv, "tcp");
358	    if (sp)
359		port = sp->s_port;
360	    else
361		port = htons(atoi(*argv));
362	} else {
363#ifdef KRB5
364	    port = krb5_getportbyname (NULL, "telnet", "tcp", 23);
365#else
366	    port = k_getportbyname("telnet", "tcp", htons(23));
367#endif
368	}
369	mini_inetd (port);
370    } else if (argc > 0) {
371	usage();
372	/* NOT REACHED */
373    }
374
375#ifdef _SC_CRAY_SECURE_SYS
376    secflag = sysconf(_SC_CRAY_SECURE_SYS);
377
378    /*
379     *	Get socket's security label
380     */
381    if (secflag)  {
382	socklen_t szss = sizeof(ss);
383	int sock_multi;
384	socklen_t szi = sizeof(int);
385
386	memset(&dv, 0, sizeof(dv));
387
388	if (getsysv(&sysv, sizeof(struct sysv)) != 0)
389	    fatalperror(net, "getsysv");
390
391	/*
392	 *	Get socket security label and set device values
393	 *	   {security label to be set on ttyp device}
394	 */
395#ifdef SO_SEC_MULTI			/* 8.0 code */
396	if ((getsockopt(0, SOL_SOCKET, SO_SECURITY,
397			(void *)&ss, &szss) < 0) ||
398	    (getsockopt(0, SOL_SOCKET, SO_SEC_MULTI,
399			(void *)&sock_multi, &szi) < 0))
400	    fatalperror(net, "getsockopt");
401	else {
402	    dv.dv_actlvl = ss.ss_actlabel.lt_level;
403	    dv.dv_actcmp = ss.ss_actlabel.lt_compart;
404	    if (!sock_multi) {
405		dv.dv_minlvl = dv.dv_maxlvl = dv.dv_actlvl;
406		dv.dv_valcmp = dv.dv_actcmp;
407	    } else {
408		dv.dv_minlvl = ss.ss_minlabel.lt_level;
409		dv.dv_maxlvl = ss.ss_maxlabel.lt_level;
410		dv.dv_valcmp = ss.ss_maxlabel.lt_compart;
411	    }
412	    dv.dv_devflg = 0;
413	}
414#else /* SO_SEC_MULTI */		/* 7.0 code */
415	if (getsockopt(0, SOL_SOCKET, SO_SECURITY,
416		       (void *)&ss, &szss) >= 0) {
417	    dv.dv_actlvl = ss.ss_slevel;
418	    dv.dv_actcmp = ss.ss_compart;
419	    dv.dv_minlvl = ss.ss_minlvl;
420	    dv.dv_maxlvl = ss.ss_maxlvl;
421	    dv.dv_valcmp = ss.ss_maxcmp;
422	}
423#endif /* SO_SEC_MULTI */
424    }
425#endif	/* _SC_CRAY_SECURE_SYS */
426
427    roken_openlog("telnetd", LOG_PID | LOG_ODELAY, LOG_DAEMON);
428    sa_size = sizeof (__ss);
429    if (getpeername(STDIN_FILENO, sa, &sa_size) < 0) {
430	fprintf(stderr, "%s: ", progname);
431	perror("getpeername");
432	_exit(1);
433    }
434    if (keepalive &&
435	setsockopt(STDIN_FILENO, SOL_SOCKET, SO_KEEPALIVE,
436		   (void *)&on, sizeof (on)) < 0) {
437	syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m");
438    }
439
440#if	defined(IPPROTO_IP) && defined(IP_TOS) && defined(HAVE_SETSOCKOPT)
441    {
442# ifdef HAVE_GETTOSBYNAME
443	struct tosent *tp;
444	if (tos < 0 && (tp = gettosbyname("telnet", "tcp")))
445	    tos = tp->t_tos;
446# endif
447	if (tos < 0)
448	    tos = 020;	/* Low Delay bit */
449	if (tos
450	    && sa->sa_family == AF_INET
451	    && (setsockopt(STDIN_FILENO, IPPROTO_IP, IP_TOS,
452			   (void *)&tos, sizeof(tos)) < 0)
453	    && (errno != ENOPROTOOPT) )
454	    syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
455    }
456#endif	/* defined(IPPROTO_IP) && defined(IP_TOS) */
457    net = STDIN_FILENO;
458    doit(sa, sa_size);
459    /* NOTREACHED */
460    return 0;
461}  /* end of main */
462
463static void
464usage(void)
465{
466    fprintf(stderr, "Usage: telnetd");
467#ifdef	AUTHENTICATION
468    fprintf(stderr, " [-a (debug|other|otp|user|valid|off|none)]\n\t");
469#endif
470    fprintf(stderr, " [-debug]");
471#ifdef DIAGNOSTICS
472    fprintf(stderr, " [-D (options|report|exercise|netdata|ptydata)]\n\t");
473#endif
474#ifdef	AUTHENTICATION
475    fprintf(stderr, " [-edebug]");
476#endif
477    fprintf(stderr, " [-h]");
478    fprintf(stderr, " [-L login]");
479    fprintf(stderr, " [-n]");
480#ifdef	_CRAY
481    fprintf(stderr, " [-r[lowpty]-[highpty]]");
482#endif
483    fprintf(stderr, "\n\t");
484#ifdef	HAVE_GETTOSBYNAME
485    fprintf(stderr, " [-S tos]");
486#endif
487#ifdef	AUTHENTICATION
488    fprintf(stderr, " [-X auth-type] [-y] [-z]");
489#endif
490    fprintf(stderr, " [-u utmp_hostname_length] [-U]");
491    fprintf(stderr, " [port]\n");
492    exit(1);
493}
494
495/*
496 * getterminaltype
497 *
498 *	Ask the other end to send along its terminal type and speed.
499 * Output is the variable terminaltype filled in.
500 */
501static unsigned char ttytype_sbbuf[] = {
502    IAC, SB, TELOPT_TTYPE, TELQUAL_SEND, IAC, SE
503};
504
505int
506getterminaltype(char *name, size_t name_sz)
507{
508    int retval = -1;
509
510    settimer(baseline);
511#ifdef AUTHENTICATION
512    /*
513     * Handle the Authentication option before we do anything else.
514     */
515    send_do(TELOPT_AUTHENTICATION, 1);
516    while (his_will_wont_is_changing(TELOPT_AUTHENTICATION))
517	ttloop();
518    if (his_state_is_will(TELOPT_AUTHENTICATION)) {
519	retval = auth_wait(name, name_sz);
520    }
521#endif
522
523#ifdef ENCRYPTION
524    send_will(TELOPT_ENCRYPT, 1);
525    send_do(TELOPT_ENCRYPT, 1);	/* esc@magic.fi */
526#endif
527    send_do(TELOPT_TTYPE, 1);
528    send_do(TELOPT_TSPEED, 1);
529    send_do(TELOPT_XDISPLOC, 1);
530    send_do(TELOPT_NEW_ENVIRON, 1);
531    send_do(TELOPT_OLD_ENVIRON, 1);
532    while (
533#ifdef ENCRYPTION
534	   his_do_dont_is_changing(TELOPT_ENCRYPT) ||
535#endif
536	   his_will_wont_is_changing(TELOPT_TTYPE) ||
537	   his_will_wont_is_changing(TELOPT_TSPEED) ||
538	   his_will_wont_is_changing(TELOPT_XDISPLOC) ||
539	   his_will_wont_is_changing(TELOPT_NEW_ENVIRON) ||
540	   his_will_wont_is_changing(TELOPT_OLD_ENVIRON)) {
541	ttloop();
542    }
543#ifdef ENCRYPTION
544    /*
545     * Wait for the negotiation of what type of encryption we can
546     * send with.  If autoencrypt is not set, this will just return.
547     */
548    if (his_state_is_will(TELOPT_ENCRYPT)) {
549	encrypt_wait();
550    }
551#endif
552    if (his_state_is_will(TELOPT_TSPEED)) {
553	static unsigned char sb[] =
554	{ IAC, SB, TELOPT_TSPEED, TELQUAL_SEND, IAC, SE };
555
556	telnet_net_write (sb, sizeof sb);
557	DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2););
558    }
559    if (his_state_is_will(TELOPT_XDISPLOC)) {
560	static unsigned char sb[] =
561	{ IAC, SB, TELOPT_XDISPLOC, TELQUAL_SEND, IAC, SE };
562
563	telnet_net_write (sb, sizeof sb);
564	DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2););
565    }
566    if (his_state_is_will(TELOPT_NEW_ENVIRON)) {
567	static unsigned char sb[] =
568	{ IAC, SB, TELOPT_NEW_ENVIRON, TELQUAL_SEND, IAC, SE };
569
570	telnet_net_write (sb, sizeof sb);
571	DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2););
572    }
573    else if (his_state_is_will(TELOPT_OLD_ENVIRON)) {
574	static unsigned char sb[] =
575	{ IAC, SB, TELOPT_OLD_ENVIRON, TELQUAL_SEND, IAC, SE };
576
577	telnet_net_write (sb, sizeof sb);
578	DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2););
579    }
580    if (his_state_is_will(TELOPT_TTYPE)) {
581
582	telnet_net_write (ttytype_sbbuf, sizeof ttytype_sbbuf);
583	DIAG(TD_OPTIONS, printsub('>', ttytype_sbbuf + 2,
584				  sizeof ttytype_sbbuf - 2););
585    }
586    if (his_state_is_will(TELOPT_TSPEED)) {
587	while (sequenceIs(tspeedsubopt, baseline))
588	    ttloop();
589    }
590    if (his_state_is_will(TELOPT_XDISPLOC)) {
591	while (sequenceIs(xdisplocsubopt, baseline))
592	    ttloop();
593    }
594    if (his_state_is_will(TELOPT_NEW_ENVIRON)) {
595	while (sequenceIs(environsubopt, baseline))
596	    ttloop();
597    }
598    if (his_state_is_will(TELOPT_OLD_ENVIRON)) {
599	while (sequenceIs(oenvironsubopt, baseline))
600	    ttloop();
601    }
602    if (his_state_is_will(TELOPT_TTYPE)) {
603	char first[256], last[256];
604
605	while (sequenceIs(ttypesubopt, baseline))
606	    ttloop();
607
608	/*
609	 * If the other side has already disabled the option, then
610	 * we have to just go with what we (might) have already gotten.
611	 */
612	if (his_state_is_will(TELOPT_TTYPE) && !terminaltypeok(terminaltype)) {
613	    strlcpy(first, terminaltype, sizeof(first));
614	    for(;;) {
615		/*
616		 * Save the unknown name, and request the next name.
617		 */
618		strlcpy(last, terminaltype, sizeof(last));
619		_gettermname();
620		if (terminaltypeok(terminaltype))
621		    break;
622		if ((strncmp(last, terminaltype, sizeof(last)) == 0) ||
623		    his_state_is_wont(TELOPT_TTYPE)) {
624		    /*
625		     * We've hit the end.  If this is the same as
626		     * the first name, just go with it.
627		     */
628		    if (strncmp(first, terminaltype, sizeof(first)) == 0)
629			break;
630		    /*
631		     * Get the terminal name one more time, so that
632		     * RFC1091 compliant telnets will cycle back to
633		     * the start of the list.
634		     */
635		    _gettermname();
636		    if (strncmp(first, terminaltype, sizeof(first)) != 0)
637			strcpy(terminaltype, first);
638		    break;
639		}
640	    }
641	}
642    }
643    return(retval);
644}  /* end of getterminaltype */
645
646void
647_gettermname(void)
648{
649    /*
650     * If the client turned off the option,
651     * we can't send another request, so we
652     * just return.
653     */
654    if (his_state_is_wont(TELOPT_TTYPE))
655	return;
656    settimer(baseline);
657    telnet_net_write (ttytype_sbbuf, sizeof ttytype_sbbuf);
658    DIAG(TD_OPTIONS, printsub('>', ttytype_sbbuf + 2,
659			      sizeof ttytype_sbbuf - 2););
660    while (sequenceIs(ttypesubopt, baseline))
661	ttloop();
662}
663
664int
665terminaltypeok(char *s)
666{
667    return 1;
668}
669
670
671char host_name[MaxHostNameLen];
672char remote_host_name[MaxHostNameLen];
673char remote_utmp_name[MaxHostNameLen];
674
675/*
676 * Get a pty, scan input lines.
677 */
678static void
679doit(struct sockaddr *who, int who_len)
680{
681    int level;
682    int ptynum;
683    char user_name[256];
684    int error;
685
686    /*
687     * Find an available pty to use.
688     */
689    ourpty = getpty(&ptynum);
690    if (ourpty < 0)
691	fatal(net, "All network ports in use");
692
693#ifdef _SC_CRAY_SECURE_SYS
694    /*
695     *	set ttyp line security label
696     */
697    if (secflag) {
698	char slave_dev[16];
699
700	snprintf(tty_dev, sizeof(tty_dev), "/dev/pty/%03d", ptynum);
701	if (setdevs(tty_dev, &dv) < 0)
702	    fatal(net, "cannot set pty security");
703	snprintf(slave_dev, sizeof(slave_dev), "/dev/ttyp%03d", ptynum);
704	if (setdevs(slave_dev, &dv) < 0)
705	    fatal(net, "cannot set tty security");
706    }
707#endif	/* _SC_CRAY_SECURE_SYS */
708
709    error = getnameinfo_verified (who, who_len,
710				  remote_host_name,
711				  sizeof(remote_host_name),
712				  NULL, 0,
713				  registerd_host_only ? NI_NAMEREQD : 0);
714    if (error)
715	fatal(net, "Couldn't resolve your address into a host name.\r\n\
716Please contact your net administrator");
717
718    gethostname(host_name, sizeof (host_name));
719
720    strlcpy (remote_utmp_name, remote_host_name, sizeof(remote_utmp_name));
721
722    /* Only trim if too long (and possible) */
723    if (strlen(remote_utmp_name) > utmp_len) {
724	char *domain = strchr(host_name, '.');
725	char *p = strchr(remote_utmp_name, '.');
726	if (domain != NULL && p != NULL && (strcmp(p, domain) == 0))
727	    *p = '\0'; /* remove domain part */
728    }
729
730    /*
731     * If hostname still doesn't fit utmp, use ipaddr.
732     */
733    if (strlen(remote_utmp_name) > utmp_len) {
734	error = getnameinfo (who, who_len,
735			     remote_utmp_name,
736			     sizeof(remote_utmp_name),
737			     NULL, 0,
738			     NI_NUMERICHOST);
739	if (error)
740	    fatal(net, "Couldn't get numeric address\r\n");
741    }
742
743#ifdef AUTHENTICATION
744    auth_encrypt_init(host_name, remote_host_name, "TELNETD", 1);
745#endif
746
747    init_env();
748    /*
749     * get terminal type.
750     */
751    *user_name = 0;
752    level = getterminaltype(user_name, sizeof(user_name));
753    esetenv("TERM", terminaltype ? terminaltype : "network", 1);
754
755#ifdef _SC_CRAY_SECURE_SYS
756    if (secflag) {
757	if (setulvl(dv.dv_actlvl) < 0)
758	    fatal(net,"cannot setulvl()");
759	if (setucmp(dv.dv_actcmp) < 0)
760	    fatal(net, "cannot setucmp()");
761    }
762#endif	/* _SC_CRAY_SECURE_SYS */
763
764    /* begin server processing */
765    my_telnet(net, ourpty, remote_host_name, remote_utmp_name,
766	      level, user_name);
767    /*NOTREACHED*/
768}  /* end of doit */
769
770/* output contents of /etc/issue.net, or /etc/issue */
771static void
772show_issue(void)
773{
774    FILE *f;
775    char buf[128];
776    f = fopen(SYSCONFDIR "/issue.net", "r");
777    if(f == NULL)
778	f = fopen(SYSCONFDIR "/issue", "r");
779    if(f){
780	while(fgets(buf, sizeof(buf)-2, f)){
781	    strcpy(buf + strcspn(buf, "\r\n"), "\r\n");
782	    writenet((unsigned char*)buf, strlen(buf));
783	}
784	fclose(f);
785    }
786}
787
788/*
789 * Main loop.  Select from pty and network, and
790 * hand data to telnet receiver finite state machine.
791 */
792void
793my_telnet(int f, int p, const char *host, const char *utmp_host,
794	  int level, char *autoname)
795{
796    int on = 1;
797    char *he;
798    char *IM;
799    int nfd;
800    int startslave_called = 0;
801    time_t timeout;
802
803    /*
804     * Initialize the slc mapping table.
805     */
806    get_slc_defaults();
807
808    /*
809     * Do some tests where it is desireable to wait for a response.
810     * Rather than doing them slowly, one at a time, do them all
811     * at once.
812     */
813    if (my_state_is_wont(TELOPT_SGA))
814	send_will(TELOPT_SGA, 1);
815    /*
816     * Is the client side a 4.2 (NOT 4.3) system?  We need to know this
817     * because 4.2 clients are unable to deal with TCP urgent data.
818     *
819     * To find out, we send out a "DO ECHO".  If the remote system
820     * answers "WILL ECHO" it is probably a 4.2 client, and we note
821     * that fact ("WILL ECHO" ==> that the client will echo what
822     * WE, the server, sends it; it does NOT mean that the client will
823     * echo the terminal input).
824     */
825    send_do(TELOPT_ECHO, 1);
826
827    /*
828     * Send along a couple of other options that we wish to negotiate.
829     */
830    send_do(TELOPT_NAWS, 1);
831    send_will(TELOPT_STATUS, 1);
832    flowmode = 1;		/* default flow control state */
833    restartany = -1;	/* uninitialized... */
834    send_do(TELOPT_LFLOW, 1);
835
836    /*
837     * Spin, waiting for a response from the DO ECHO.  However,
838     * some REALLY DUMB telnets out there might not respond
839     * to the DO ECHO.  So, we spin looking for NAWS, (most dumb
840     * telnets so far seem to respond with WONT for a DO that
841     * they don't understand...) because by the time we get the
842     * response, it will already have processed the DO ECHO.
843     * Kludge upon kludge.
844     */
845    while (his_will_wont_is_changing(TELOPT_NAWS))
846	ttloop();
847
848    /*
849     * But...
850     * The client might have sent a WILL NAWS as part of its
851     * startup code; if so, we'll be here before we get the
852     * response to the DO ECHO.  We'll make the assumption
853     * that any implementation that understands about NAWS
854     * is a modern enough implementation that it will respond
855     * to our DO ECHO request; hence we'll do another spin
856     * waiting for the ECHO option to settle down, which is
857     * what we wanted to do in the first place...
858     */
859    if (his_want_state_is_will(TELOPT_ECHO) &&
860	his_state_is_will(TELOPT_NAWS)) {
861	while (his_will_wont_is_changing(TELOPT_ECHO))
862	    ttloop();
863    }
864    /*
865     * On the off chance that the telnet client is broken and does not
866     * respond to the DO ECHO we sent, (after all, we did send the
867     * DO NAWS negotiation after the DO ECHO, and we won't get here
868     * until a response to the DO NAWS comes back) simulate the
869     * receipt of a will echo.  This will also send a WONT ECHO
870     * to the client, since we assume that the client failed to
871     * respond because it believes that it is already in DO ECHO
872     * mode, which we do not want.
873     */
874    if (his_want_state_is_will(TELOPT_ECHO)) {
875	DIAG(TD_OPTIONS,
876	     {output_data("td: simulating recv\r\n");
877	     });
878	willoption(TELOPT_ECHO);
879    }
880
881    /*
882     * Finally, to clean things up, we turn on our echo.  This
883     * will break stupid 4.2 telnets out of local terminal echo.
884     */
885
886    if (my_state_is_wont(TELOPT_ECHO))
887	send_will(TELOPT_ECHO, 1);
888
889#ifdef TIOCPKT
890#ifdef	STREAMSPTY
891    if (!really_stream)
892#endif
893	/*
894	 * Turn on packet mode
895	 */
896	ioctl(p, TIOCPKT, (char *)&on);
897#endif
898
899
900    /*
901     * Call telrcv() once to pick up anything received during
902     * terminal type negotiation, 4.2/4.3 determination, and
903     * linemode negotiation.
904     */
905    telrcv();
906
907    ioctl(f, FIONBIO, (char *)&on);
908    ioctl(p, FIONBIO, (char *)&on);
909
910#if	defined(SO_OOBINLINE) && defined(HAVE_SETSOCKOPT)
911    setsockopt(net, SOL_SOCKET, SO_OOBINLINE,
912	       (void *)&on, sizeof on);
913#endif	/* defined(SO_OOBINLINE) */
914
915#ifdef	SIGTSTP
916    signal(SIGTSTP, SIG_IGN);
917#endif
918#ifdef	SIGTTOU
919    /*
920     * Ignoring SIGTTOU keeps the kernel from blocking us
921     * in ttioct() in /sys/tty.c.
922     */
923    signal(SIGTTOU, SIG_IGN);
924#endif
925
926    signal(SIGCHLD, cleanup);
927
928#ifdef  TIOCNOTTY
929    {
930	int t;
931	t = open(_PATH_TTY, O_RDWR);
932	if (t >= 0) {
933	    ioctl(t, TIOCNOTTY, (char *)0);
934	    close(t);
935	}
936    }
937#endif
938
939    show_issue();
940    /*
941     * Show banner that getty never gave.
942     *
943     * We put the banner in the pty input buffer.  This way, it
944     * gets carriage return null processing, etc., just like all
945     * other pty --> client data.
946     */
947
948    if (getenv("USER"))
949	hostinfo = 0;
950
951    IM = DEFAULT_IM;
952    he = 0;
953    edithost(he, host_name);
954    if (hostinfo && *IM)
955	putf(IM, ptyibuf2);
956
957    if (pcc)
958	strncat(ptyibuf2, ptyip, pcc+1);
959    ptyip = ptyibuf2;
960    pcc = strlen(ptyip);
961
962    DIAG(TD_REPORT, {
963	output_data("td: Entering processing loop\r\n");
964    });
965
966
967    nfd = ((f > p) ? f : p) + 1;
968    timeout = time(NULL) + 5;
969    for (;;) {
970	fd_set ibits, obits, xbits;
971	int c;
972
973	/* wait for encryption to be turned on, but don't wait
974           indefinitely */
975	if(!startslave_called && (!encrypt_delay() || timeout > time(NULL))){
976	    startslave_called = 1;
977	    startslave(host, utmp_host, level, autoname);
978	}
979
980	if (ncc < 0 && pcc < 0)
981	    break;
982
983	FD_ZERO(&ibits);
984	FD_ZERO(&obits);
985	FD_ZERO(&xbits);
986
987	if (f >= FD_SETSIZE
988	    || p >= FD_SETSIZE)
989	    fatal(net, "fd too large");
990
991	/*
992	 * Never look for input if there's still
993	 * stuff in the corresponding output buffer
994	 */
995	if (nfrontp - nbackp || pcc > 0) {
996	    FD_SET(f, &obits);
997	} else {
998	    FD_SET(p, &ibits);
999	}
1000	if (pfrontp - pbackp || ncc > 0) {
1001	    FD_SET(p, &obits);
1002	} else {
1003	    FD_SET(f, &ibits);
1004	}
1005	if (!SYNCHing) {
1006	    FD_SET(f, &xbits);
1007	}
1008	if ((c = select(nfd, &ibits, &obits, &xbits,
1009			(struct timeval *)0)) < 1) {
1010	    if (c == -1) {
1011		if (errno == EINTR) {
1012		    continue;
1013		}
1014	    }
1015	    sleep(5);
1016	    continue;
1017	}
1018
1019	/*
1020	 * Any urgent data?
1021	 */
1022	if (FD_ISSET(net, &xbits)) {
1023	    SYNCHing = 1;
1024	}
1025
1026	/*
1027	 * Something to read from the network...
1028	 */
1029	if (FD_ISSET(net, &ibits)) {
1030#ifndef SO_OOBINLINE
1031	    /*
1032	     * In 4.2 (and 4.3 beta) systems, the
1033	     * OOB indication and data handling in the kernel
1034	     * is such that if two separate TCP Urgent requests
1035	     * come in, one byte of TCP data will be overlaid.
1036	     * This is fatal for Telnet, but we try to live
1037	     * with it.
1038	     *
1039	     * In addition, in 4.2 (and...), a special protocol
1040	     * is needed to pick up the TCP Urgent data in
1041	     * the correct sequence.
1042	     *
1043	     * What we do is:  if we think we are in urgent
1044	     * mode, we look to see if we are "at the mark".
1045	     * If we are, we do an OOB receive.  If we run
1046	     * this twice, we will do the OOB receive twice,
1047	     * but the second will fail, since the second
1048	     * time we were "at the mark", but there wasn't
1049	     * any data there (the kernel doesn't reset
1050	     * "at the mark" until we do a normal read).
1051	     * Once we've read the OOB data, we go ahead
1052	     * and do normal reads.
1053	     *
1054	     * There is also another problem, which is that
1055	     * since the OOB byte we read doesn't put us
1056	     * out of OOB state, and since that byte is most
1057	     * likely the TELNET DM (data mark), we would
1058	     * stay in the TELNET SYNCH (SYNCHing) state.
1059	     * So, clocks to the rescue.  If we've "just"
1060	     * received a DM, then we test for the
1061	     * presence of OOB data when the receive OOB
1062	     * fails (and AFTER we did the normal mode read
1063	     * to clear "at the mark").
1064	     */
1065	    if (SYNCHing) {
1066		int atmark;
1067
1068		ioctl(net, SIOCATMARK, (char *)&atmark);
1069		if (atmark) {
1070		    ncc = recv(net, netibuf, sizeof (netibuf), MSG_OOB);
1071		    if ((ncc == -1) && (errno == EINVAL)) {
1072			ncc = read(net, netibuf, sizeof (netibuf));
1073			if (sequenceIs(didnetreceive, gotDM)) {
1074			    SYNCHing = stilloob(net);
1075			}
1076		    }
1077		} else {
1078		    ncc = read(net, netibuf, sizeof (netibuf));
1079		}
1080	    } else {
1081		ncc = read(net, netibuf, sizeof (netibuf));
1082	    }
1083	    settimer(didnetreceive);
1084#else	/* !defined(SO_OOBINLINE)) */
1085	    ncc = read(net, netibuf, sizeof (netibuf));
1086#endif	/* !defined(SO_OOBINLINE)) */
1087	    if (ncc < 0 && errno == EWOULDBLOCK)
1088		ncc = 0;
1089	    else {
1090		if (ncc <= 0) {
1091		    break;
1092		}
1093		netip = netibuf;
1094	    }
1095	    DIAG((TD_REPORT | TD_NETDATA), {
1096		output_data("td: netread %d chars\r\n", ncc);
1097		});
1098	    DIAG(TD_NETDATA, printdata("nd", netip, ncc));
1099	}
1100
1101	/*
1102	 * Something to read from the pty...
1103	 */
1104	if (FD_ISSET(p, &ibits)) {
1105#ifdef STREAMSPTY
1106	    if (really_stream)
1107		pcc = readstream(p, ptyibuf, BUFSIZ);
1108	    else
1109#endif
1110		pcc = read(p, ptyibuf, BUFSIZ);
1111
1112	    /*
1113	     * On some systems, if we try to read something
1114	     * off the master side before the slave side is
1115	     * opened, we get EIO.
1116	     */
1117	    if (pcc < 0 && (errno == EWOULDBLOCK ||
1118#ifdef	EAGAIN
1119			    errno == EAGAIN ||
1120#endif
1121			    errno == EIO)) {
1122		pcc = 0;
1123	    } else {
1124		if (pcc <= 0)
1125		    break;
1126		if (ptyibuf[0] & TIOCPKT_FLUSHWRITE) {
1127		    netclear();	/* clear buffer back */
1128#ifndef	NO_URGENT
1129		    /*
1130		     * There are client telnets on some
1131		     * operating systems get screwed up
1132		     * royally if we send them urgent
1133		     * mode data.
1134		     */
1135		    output_data ("%c%c", IAC, DM);
1136
1137		    neturg = nfrontp-1; /* off by one XXX */
1138		    DIAG(TD_OPTIONS,
1139			 printoption("td: send IAC", DM));
1140
1141#endif
1142		}
1143		if (his_state_is_will(TELOPT_LFLOW) &&
1144		    (ptyibuf[0] &
1145		     (TIOCPKT_NOSTOP|TIOCPKT_DOSTOP))) {
1146		    int newflow =
1147			ptyibuf[0] & TIOCPKT_DOSTOP ? 1 : 0;
1148		    if (newflow != flowmode) {
1149			flowmode = newflow;
1150			output_data("%c%c%c%c%c%c",
1151				    IAC, SB, TELOPT_LFLOW,
1152				    flowmode ? LFLOW_ON
1153				    : LFLOW_OFF,
1154				    IAC, SE);
1155			DIAG(TD_OPTIONS, printsub('>',
1156						  (unsigned char *)nfrontp-4,
1157						  4););
1158		    }
1159		}
1160		pcc--;
1161		ptyip = ptyibuf+1;
1162	    }
1163	}
1164
1165	while (pcc > 0) {
1166	    if ((&netobuf[BUFSIZ] - nfrontp) < 3)
1167		break;
1168	    c = *ptyip++ & 0377, pcc--;
1169	    if (c == IAC)
1170		*nfrontp++ = c;
1171	    *nfrontp++ = c;
1172	    if ((c == '\r') && (my_state_is_wont(TELOPT_BINARY))) {
1173		if (pcc > 0 && ((*ptyip & 0377) == '\n')) {
1174		    *nfrontp++ = *ptyip++ & 0377;
1175		    pcc--;
1176		} else
1177		    *nfrontp++ = '\0';
1178	    }
1179	}
1180
1181	if (FD_ISSET(f, &obits) && (nfrontp - nbackp) > 0)
1182	    netflush();
1183	if (ncc > 0)
1184	    telrcv();
1185	if (FD_ISSET(p, &obits) && (pfrontp - pbackp) > 0)
1186	    ptyflush();
1187    }
1188    cleanup(0);
1189}
1190
1191#ifndef	TCSIG
1192# ifdef	TIOCSIG
1193#  define TCSIG TIOCSIG
1194# endif
1195#endif
1196
1197#ifdef	STREAMSPTY
1198
1199    int flowison = -1;  /* current state of flow: -1 is unknown */
1200
1201int
1202readstream(int p, char *ibuf, int bufsize)
1203{
1204    int flags = 0;
1205    int ret = 0;
1206    struct termios *tsp;
1207#if 0
1208    struct termio *tp;
1209#endif
1210    struct iocblk *ip;
1211    char vstop, vstart;
1212    int ixon;
1213    int newflow;
1214
1215    strbufc.maxlen = BUFSIZ;
1216    strbufc.buf = (char *)ctlbuf;
1217    strbufd.maxlen = bufsize-1;
1218    strbufd.len = 0;
1219    strbufd.buf = ibuf+1;
1220    ibuf[0] = 0;
1221
1222    ret = getmsg(p, &strbufc, &strbufd, &flags);
1223    if (ret < 0)  /* error of some sort -- probably EAGAIN */
1224	return(-1);
1225
1226    if (strbufc.len <= 0 || ctlbuf[0] == M_DATA) {
1227	/* data message */
1228	if (strbufd.len > 0) {			/* real data */
1229	    return(strbufd.len + 1);	/* count header char */
1230	} else {
1231	    /* nothing there */
1232	    errno = EAGAIN;
1233	    return(-1);
1234	}
1235    }
1236
1237    /*
1238     * It's a control message.  Return 1, to look at the flag we set
1239     */
1240
1241    switch (ctlbuf[0]) {
1242    case M_FLUSH:
1243	if (ibuf[1] & FLUSHW)
1244	    ibuf[0] = TIOCPKT_FLUSHWRITE;
1245	return(1);
1246
1247    case M_IOCTL:
1248	ip = (struct iocblk *) (ibuf+1);
1249
1250	switch (ip->ioc_cmd) {
1251#ifdef TCSETS
1252	case TCSETS:
1253	case TCSETSW:
1254	case TCSETSF:
1255	    tsp = (struct termios *)
1256		(ibuf+1 + sizeof(struct iocblk));
1257	    vstop = tsp->c_cc[VSTOP];
1258	    vstart = tsp->c_cc[VSTART];
1259	    ixon = tsp->c_iflag & IXON;
1260	    break;
1261#endif
1262#if 0
1263	case TCSETA:
1264	case TCSETAW:
1265	case TCSETAF:
1266	    tp = (struct termio *) (ibuf+1 + sizeof(struct iocblk));
1267	    vstop = tp->c_cc[VSTOP];
1268	    vstart = tp->c_cc[VSTART];
1269	    ixon = tp->c_iflag & IXON;
1270	    break;
1271#endif
1272	default:
1273	    errno = EAGAIN;
1274	    return(-1);
1275	}
1276
1277	newflow =  (ixon && (vstart == 021) && (vstop == 023)) ? 1 : 0;
1278	if (newflow != flowison) {  /* it's a change */
1279	    flowison = newflow;
1280	    ibuf[0] = newflow ? TIOCPKT_DOSTOP : TIOCPKT_NOSTOP;
1281	    return(1);
1282	}
1283    }
1284
1285    /* nothing worth doing anything about */
1286    errno = EAGAIN;
1287    return(-1);
1288}
1289#endif /* STREAMSPTY */
1290
1291/*
1292 * Send interrupt to process on other side of pty.
1293 * If it is in raw mode, just write NULL;
1294 * otherwise, write intr char.
1295 */
1296void
1297interrupt()
1298{
1299    ptyflush();	/* half-hearted */
1300
1301#if defined(STREAMSPTY) && defined(TIOCSIGNAL)
1302    /* Streams PTY style ioctl to post a signal */
1303    if (really_stream)
1304	{
1305	    int sig = SIGINT;
1306	    ioctl(ourpty, TIOCSIGNAL, &sig);
1307	    ioctl(ourpty, I_FLUSH, FLUSHR);
1308	}
1309#else
1310#ifdef	TCSIG
1311    ioctl(ourpty, TCSIG, (char *)SIGINT);
1312#else	/* TCSIG */
1313    init_termbuf();
1314    *pfrontp++ = slctab[SLC_IP].sptr ?
1315	(unsigned char)*slctab[SLC_IP].sptr : '\177';
1316#endif	/* TCSIG */
1317#endif
1318}
1319
1320/*
1321 * Send quit to process on other side of pty.
1322 * If it is in raw mode, just write NULL;
1323 * otherwise, write quit char.
1324 */
1325void
1326sendbrk()
1327{
1328    ptyflush();	/* half-hearted */
1329#ifdef	TCSIG
1330    ioctl(ourpty, TCSIG, (char *)SIGQUIT);
1331#else	/* TCSIG */
1332    init_termbuf();
1333    *pfrontp++ = slctab[SLC_ABORT].sptr ?
1334	(unsigned char)*slctab[SLC_ABORT].sptr : '\034';
1335#endif	/* TCSIG */
1336}
1337
1338void
1339sendsusp()
1340{
1341#ifdef	SIGTSTP
1342    ptyflush();	/* half-hearted */
1343# ifdef	TCSIG
1344    ioctl(ourpty, TCSIG, (char *)SIGTSTP);
1345# else	/* TCSIG */
1346    *pfrontp++ = slctab[SLC_SUSP].sptr ?
1347	(unsigned char)*slctab[SLC_SUSP].sptr : '\032';
1348# endif	/* TCSIG */
1349#endif	/* SIGTSTP */
1350}
1351
1352/*
1353 * When we get an AYT, if ^T is enabled, use that.  Otherwise,
1354 * just send back "[Yes]".
1355 */
1356void
1357recv_ayt()
1358{
1359#if	defined(SIGINFO) && defined(TCSIG)
1360    if (slctab[SLC_AYT].sptr && *slctab[SLC_AYT].sptr != _POSIX_VDISABLE) {
1361	ioctl(ourpty, TCSIG, (char *)SIGINFO);
1362	return;
1363    }
1364#endif
1365    output_data("\r\n[Yes]\r\n");
1366}
1367
1368void
1369doeof()
1370{
1371    init_termbuf();
1372
1373    *pfrontp++ = slctab[SLC_EOF].sptr ?
1374	(unsigned char)*slctab[SLC_EOF].sptr : '\004';
1375}
1376