2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * @(#)telnetd.c 8.4 (Berkeley) 5/30/95
30 * $FreeBSD: src/crypto/telnet/telnetd/telnetd.c,v 1.11.2.5 2002/04/13 10:59:09 markm Exp $
34 #include "pathnames.h"
43 #include <arpa/inet.h>
46 #include <libtelnet/auth.h>
50 #include <libtelnet/encrypt.h>
52 #include <libtelnet/misc.h>
54 char remote_hostname
[MAXHOSTNAMELEN
];
55 size_t utmp_len
= sizeof(remote_hostname
) - 1;
56 int registerd_host_only
= 0;
61 * pointers, and counters.
63 char ptyibuf
[BUFSIZ
], *ptyip
= ptyibuf
;
64 char ptyibuf2
[BUFSIZ
];
66 int readstream(int, char *, int);
67 void doit(struct sockaddr
*);
68 int terminaltypeok(char *);
70 int hostinfo
= 1; /* do we print login banner? */
76 void doit(struct sockaddr
*);
77 int terminaltypeok(char *);
78 void startslave(char *, int, char *);
79 extern void usage(void);
80 static void _gettermname(void);
83 * The string to pass to getopt(). We do it this way so
84 * that only the actual options that we support will be
85 * passed off to getopt().
88 'd', ':', 'h', 'k', 'n', 'p', ':', 'S', ':', 'u', ':', 'U',
108 int family
= AF_INET
;
110 #ifndef MAXHOSTNAMELEN
111 #define MAXHOSTNAMELEN 256
112 #endif /* MAXHOSTNAMELEN */
115 char host_name
[MAXHOSTNAMELEN
];
117 extern void telnet(int, int, char *);
123 main(int argc
, char *argv
[])
125 struct sockaddr_storage from
;
128 #if defined(IPPROTO_IP) && defined(IP_TOS)
132 pfrontp
= pbackp
= ptyobuf
;
134 nfrontp
= nbackp
= netobuf
;
137 #endif /* ENCRYPTION */
140 * This initialization causes linemode to default to a configuration
141 * that works on all telnet clients, including the FreeBSD client.
142 * This is not quite the same as the telnet client issuing a "mode
143 * character" command, but has most of the same benefits, and is
144 * preferable since some clients (like usofts) don't have the
145 * mode character command anyway and linemode breaks things.
146 * The most notable symptom of fix is that csh "set filec" operations
147 * like <ESC> (filename completion) and ^D (choices) keys now work
148 * in telnet sessions and can be used more than once on the same line.
149 * CR/LF handling is also corrected in some termio modes. This
150 * change resolves problem reports bin/771 and bin/1037.
153 linemode
=1; /*Default to mode that works on bulk of clients*/
155 while ((ch
= getopt(argc
, argv
, valid_opts
)) != -1) {
158 #ifdef AUTHENTICATION
161 * Check for required authentication level
163 if (strcmp(optarg
, "debug") == 0) {
164 extern int auth_debug_mode
;
166 } else if (strcasecmp(optarg
, "none") == 0) {
168 } else if (strcasecmp(optarg
, "other") == 0) {
169 auth_level
= AUTH_OTHER
;
170 } else if (strcasecmp(optarg
, "user") == 0) {
171 auth_level
= AUTH_USER
;
172 } else if (strcasecmp(optarg
, "valid") == 0) {
173 auth_level
= AUTH_VALID
;
174 } else if (strcasecmp(optarg
, "off") == 0) {
176 * This hack turns off authentication
180 warnx("unknown authorization level for -a");
183 #endif /* AUTHENTICATION */
189 #endif /* BFTPDAEMON */
192 if (strcmp(optarg
, "ebug") == 0) {
203 * Check for desired diagnostics capabilities.
205 if (!strcmp(optarg
, "report")) {
206 diagnostic
|= TD_REPORT
|TD_OPTIONS
;
207 } else if (!strcmp(optarg
, "exercise")) {
208 diagnostic
|= TD_EXERCISE
;
209 } else if (!strcmp(optarg
, "netdata")) {
210 diagnostic
|= TD_NETDATA
;
211 } else if (!strcmp(optarg
, "ptydata")) {
212 diagnostic
|= TD_PTYDATA
;
213 } else if (!strcmp(optarg
, "options")) {
214 diagnostic
|= TD_OPTIONS
;
220 #endif /* DIAGNOSTICS */
224 if (strcmp(optarg
, "debug") == 0) {
225 extern int encrypt_debug_mode
;
226 encrypt_debug_mode
= 1;
232 #endif /* ENCRYPTION */
242 #endif /* LINEMODE */
245 #if defined(LINEMODE) && defined(KLUDGELINEMODE)
246 lmodetype
= NO_AUTOKLUDGE
;
248 /* ignore -k option if built without kludge linemode */
249 #endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */
262 if ((tos
= parsetos(optarg
, "tcp")) < 0)
264 "bad TOS argument '", optarg
,
265 "'; will try to use default TOS");
267 warnx("TOS option unavailable; -S flag not supported");
272 utmp_len
= (size_t)atoi(optarg
);
273 if (utmp_len
>= sizeof(remote_hostname
))
274 utmp_len
= sizeof(remote_hostname
) - 1;
278 registerd_host_only
= 1;
281 #ifdef AUTHENTICATION
284 * Check for invalid authentication types
286 auth_disable_name(optarg
);
288 #endif /* AUTHENTICATION */
301 warnx("%c: unknown option", ch
);
313 int s
, ns
, foo
, error
;
314 const char *service
= "telnet";
315 struct addrinfo hints
, *res
;
320 } else if (argc
== 1)
323 memset(&hints
, 0, sizeof(hints
));
324 hints
.ai_flags
= AI_PASSIVE
;
325 hints
.ai_family
= family
;
326 hints
.ai_socktype
= SOCK_STREAM
;
327 hints
.ai_protocol
= 0;
328 error
= getaddrinfo(NULL
, service
, &hints
, &res
);
331 errx(1, "tcp/%s: %s\n", service
, gai_strerror(error
));
332 if (error
== EAI_SYSTEM
)
333 errx(1, "tcp/%s: %s\n", service
, strerror(errno
));
337 s
= socket(res
->ai_family
, res
->ai_socktype
, res
->ai_protocol
);
340 (void) setsockopt(s
, SOL_SOCKET
, SO_REUSEADDR
,
341 (char *)&on
, sizeof(on
));
342 if (bind(s
, res
->ai_addr
, res
->ai_addrlen
) < 0)
344 if (listen(s
, 1) < 0)
346 foo
= res
->ai_addrlen
;
347 ns
= accept(s
, res
->ai_addr
, &foo
);
354 } else if (argc
== 1) {
355 ; /* VOID*/ /* Just ignore the host/port name */
357 } else if (argc
> 0) {
362 openlog("telnetd", LOG_PID
| LOG_ODELAY
, LOG_DAEMON
);
363 fromlen
= sizeof (from
);
364 if (getpeername(0, (struct sockaddr
*)&from
, &fromlen
) < 0) {
369 setsockopt(0, SOL_SOCKET
, SO_KEEPALIVE
,
370 (char *)&on
, sizeof (on
)) < 0) {
371 syslog(LOG_WARNING
, "setsockopt (SO_KEEPALIVE): %m");
374 #if defined(IPPROTO_IP) && defined(IP_TOS)
375 if (from
.ss_family
== AF_INET
) {
376 # if defined(HAS_GETTOS)
378 if (tos
< 0 && (tp
= gettosbyname("telnet", "tcp")))
382 tos
= 020; /* Low Delay bit */
384 && (setsockopt(0, IPPROTO_IP
, IP_TOS
,
385 (char *)&tos
, sizeof(tos
)) < 0)
386 && (errno
!= ENOPROTOOPT
) )
387 syslog(LOG_WARNING
, "setsockopt (IP_TOS): %m");
389 #endif /* defined(IPPROTO_IP) && defined(IP_TOS) */
391 doit((struct sockaddr
*)&from
);
399 fprintf(stderr
, "usage: telnetd");
400 #ifdef AUTHENTICATION
401 fprintf(stderr
, " [-a (debug|other|user|valid|off|none)]\n\t");
404 fprintf(stderr
, " [-B]");
406 fprintf(stderr
, " [-debug]");
408 fprintf(stderr
, " [-D (options|report|exercise|netdata|ptydata)]\n\t");
410 #ifdef AUTHENTICATION
411 fprintf(stderr
, " [-edebug]");
413 fprintf(stderr
, " [-h]");
414 #if defined(LINEMODE) && defined(KLUDGELINEMODE)
415 fprintf(stderr
, " [-k]");
418 fprintf(stderr
, " [-l]");
420 fprintf(stderr
, " [-n]");
421 fprintf(stderr
, "\n\t");
423 fprintf(stderr
, " [-S tos]");
425 #ifdef AUTHENTICATION
426 fprintf(stderr
, " [-X auth-type]");
428 fprintf(stderr
, " [-u utmp_hostname_length] [-U]");
429 fprintf(stderr
, " [port]\n");
436 * Ask the other end to send along its terminal type and speed.
437 * Output is the variable terminaltype filled in.
439 static unsigned char ttytype_sbbuf
[] = {
440 IAC
, SB
, TELOPT_TTYPE
, TELQUAL_SEND
, IAC
, SE
444 #ifndef AUTHENTICATION
445 #define undef2 __unused
451 getterminaltype(char *name undef2
)
456 #ifdef AUTHENTICATION
458 * Handle the Authentication option before we do anything else.
460 send_do(TELOPT_AUTHENTICATION
, 1);
461 while (his_will_wont_is_changing(TELOPT_AUTHENTICATION
))
463 if (his_state_is_will(TELOPT_AUTHENTICATION
)) {
464 retval
= auth_wait(name
);
469 send_will(TELOPT_ENCRYPT
, 1);
470 #endif /* ENCRYPTION */
471 send_do(TELOPT_TTYPE
, 1);
472 send_do(TELOPT_TSPEED
, 1);
473 send_do(TELOPT_XDISPLOC
, 1);
474 send_do(TELOPT_NEW_ENVIRON
, 1);
475 send_do(TELOPT_OLD_ENVIRON
, 1);
478 his_do_dont_is_changing(TELOPT_ENCRYPT
) ||
479 #endif /* ENCRYPTION */
480 his_will_wont_is_changing(TELOPT_TTYPE
) ||
481 his_will_wont_is_changing(TELOPT_TSPEED
) ||
482 his_will_wont_is_changing(TELOPT_XDISPLOC
) ||
483 his_will_wont_is_changing(TELOPT_NEW_ENVIRON
) ||
484 his_will_wont_is_changing(TELOPT_OLD_ENVIRON
)) {
489 * Wait for the negotiation of what type of encryption we can
490 * send with. If autoencrypt is not set, this will just return.
492 if (his_state_is_will(TELOPT_ENCRYPT
)) {
495 #endif /* ENCRYPTION */
496 if (his_state_is_will(TELOPT_TSPEED
)) {
497 static unsigned char sb
[] =
498 { IAC
, SB
, TELOPT_TSPEED
, TELQUAL_SEND
, IAC
, SE
};
500 output_datalen(sb
, sizeof sb
);
501 DIAG(TD_OPTIONS
, printsub('>', sb
+ 2, sizeof sb
- 2););
503 if (his_state_is_will(TELOPT_XDISPLOC
)) {
504 static unsigned char sb
[] =
505 { IAC
, SB
, TELOPT_XDISPLOC
, TELQUAL_SEND
, IAC
, SE
};
507 output_datalen(sb
, sizeof sb
);
508 DIAG(TD_OPTIONS
, printsub('>', sb
+ 2, sizeof sb
- 2););
510 if (his_state_is_will(TELOPT_NEW_ENVIRON
)) {
511 static unsigned char sb
[] =
512 { IAC
, SB
, TELOPT_NEW_ENVIRON
, TELQUAL_SEND
, IAC
, SE
};
514 output_datalen(sb
, sizeof sb
);
515 DIAG(TD_OPTIONS
, printsub('>', sb
+ 2, sizeof sb
- 2););
517 else if (his_state_is_will(TELOPT_OLD_ENVIRON
)) {
518 static unsigned char sb
[] =
519 { IAC
, SB
, TELOPT_OLD_ENVIRON
, TELQUAL_SEND
, IAC
, SE
};
521 output_datalen(sb
, sizeof sb
);
522 DIAG(TD_OPTIONS
, printsub('>', sb
+ 2, sizeof sb
- 2););
524 if (his_state_is_will(TELOPT_TTYPE
)) {
526 output_datalen(ttytype_sbbuf
, sizeof ttytype_sbbuf
);
527 DIAG(TD_OPTIONS
, printsub('>', ttytype_sbbuf
+ 2,
528 sizeof ttytype_sbbuf
- 2););
530 if (his_state_is_will(TELOPT_TSPEED
)) {
531 while (sequenceIs(tspeedsubopt
, baseline
))
534 if (his_state_is_will(TELOPT_XDISPLOC
)) {
535 while (sequenceIs(xdisplocsubopt
, baseline
))
538 if (his_state_is_will(TELOPT_NEW_ENVIRON
)) {
539 while (sequenceIs(environsubopt
, baseline
))
542 if (his_state_is_will(TELOPT_OLD_ENVIRON
)) {
543 while (sequenceIs(oenvironsubopt
, baseline
))
546 if (his_state_is_will(TELOPT_TTYPE
)) {
547 char first
[256], last
[256];
549 while (sequenceIs(ttypesubopt
, baseline
))
553 * If the other side has already disabled the option, then
554 * we have to just go with what we (might) have already gotten.
556 if (his_state_is_will(TELOPT_TTYPE
) && !terminaltypeok(terminaltype
)) {
557 (void) strncpy(first
, terminaltype
, sizeof(first
)-1);
558 first
[sizeof(first
)-1] = '\0';
561 * Save the unknown name, and request the next name.
563 (void) strncpy(last
, terminaltype
, sizeof(last
)-1);
564 last
[sizeof(last
)-1] = '\0';
566 if (terminaltypeok(terminaltype
))
568 if ((strncmp(last
, terminaltype
, sizeof(last
)) == 0) ||
569 his_state_is_wont(TELOPT_TTYPE
)) {
571 * We've hit the end. If this is the same as
572 * the first name, just go with it.
574 if (strncmp(first
, terminaltype
, sizeof(first
)) == 0)
577 * Get the terminal name one more time, so that
578 * RFC1091 compliant telnets will cycle back to
579 * the start of the list.
582 if (strncmp(first
, terminaltype
, sizeof(first
)) != 0) {
583 (void) strncpy(terminaltype
, first
, TERMINAL_TYPE_SIZE
-1);
584 terminaltype
[TERMINAL_TYPE_SIZE
-1] = '\0';
592 } /* end of getterminaltype */
598 * If the client turned off the option,
599 * we can't send another request, so we
602 if (his_state_is_wont(TELOPT_TTYPE
))
605 output_datalen(ttytype_sbbuf
, sizeof ttytype_sbbuf
);
606 DIAG(TD_OPTIONS
, printsub('>', ttytype_sbbuf
+ 2,
607 sizeof ttytype_sbbuf
- 2););
608 while (sequenceIs(ttypesubopt
, baseline
))
613 terminaltypeok(char *s
)
617 if (terminaltype
== NULL
)
621 * tgetent() will return 1 if the type is known, and
622 * 0 if it is not known. If it returns -1, it couldn't
623 * open the database. But if we can't open the database,
624 * it won't help to say we failed, because we won't be
625 * able to verify anything else. So, we treat -1 like 1.
627 if (tgetent(buf
, s
) == 0)
633 * Get a pty, scan input lines.
636 doit(struct sockaddr
*who
)
642 * Find an available pty to use.
645 pty
= getpty(&ptynum
);
647 fatal(net
, "All network ports in use");
652 if ((lp
= getpty()) == NULL
)
653 fatal(net
, "Out of ptys");
655 if ((pty
= open(lp
, 2)) >= 0) {
656 strlcpy(line
,lp
,sizeof(line
));
663 /* get name of connected client */
664 if (realhostname_sa(remote_hostname
, sizeof(remote_hostname
) - 1,
665 who
, who
->sa_len
) == HOSTNAME_INVALIDADDR
&& registerd_host_only
)
666 fatal(net
, "Couldn't resolve your address into a host name.\r\n\
667 Please contact your net administrator");
668 remote_hostname
[sizeof(remote_hostname
) - 1] = '\0';
670 trimdomain(remote_hostname
, UT_HOSTSIZE
);
671 if (!isdigit(remote_hostname
[0]) && strlen(remote_hostname
) > utmp_len
)
672 err_
= getnameinfo(who
, who
->sa_len
, remote_hostname
,
673 sizeof(remote_hostname
), NULL
, 0,
674 NI_NUMERICHOST
|NI_WITHSCOPEID
);
675 /* XXX: do 'err_' check */
677 (void) gethostname(host_name
, sizeof(host_name
) - 1);
678 host_name
[sizeof(host_name
) - 1] = '\0';
679 hostname
= host_name
;
681 #ifdef AUTHENTICATION
683 /* The above #ifdefs should actually be "or"'ed, not "and"'ed.
684 * This is a byproduct of needing "#ifdef" and not "#if defined()"
685 * for unifdef. XXX MarkM
687 auth_encrypt_init(hostname
, remote_hostname
, "TELNETD", 1);
696 level
= getterminaltype(user_name
);
697 if (setenv("TERM", terminaltype
? terminaltype
: "network", 1) == -1)
698 syslog(LOG_ERR
, "setenv: cannot set TERM=%s: %m", terminaltype
? terminaltype
: "network");
700 telnet(net
, pty
, remote_hostname
); /* begin server process */
706 * Main loop. Select from pty and network, and
707 * hand data to telnet receiver finite state machine.
710 telnet(int f
, int p
, char *host
)
713 #define TABBUFSIZ 512
714 char defent
[TABBUFSIZ
];
715 char defstrs
[TABBUFSIZ
];
723 * Initialize the slc mapping table.
728 * Do some tests where it is desireable to wait for a response.
729 * Rather than doing them slowly, one at a time, do them all
732 if (my_state_is_wont(TELOPT_SGA
))
733 send_will(TELOPT_SGA
, 1);
735 * Is the client side a 4.2 (NOT 4.3) system? We need to know this
736 * because 4.2 clients are unable to deal with TCP urgent data.
738 * To find out, we send out a "DO ECHO". If the remote system
739 * answers "WILL ECHO" it is probably a 4.2 client, and we note
740 * that fact ("WILL ECHO" ==> that the client will echo what
741 * WE, the server, sends it; it does NOT mean that the client will
742 * echo the terminal input).
744 send_do(TELOPT_ECHO
, 1);
747 if (his_state_is_wont(TELOPT_LINEMODE
)) {
748 /* Query the peer for linemode support by trying to negotiate
749 * the linemode option.
753 send_do(TELOPT_LINEMODE
, 1); /* send do linemode */
755 #endif /* LINEMODE */
758 * Send along a couple of other options that we wish to negotiate.
760 send_do(TELOPT_NAWS
, 1);
761 send_will(TELOPT_STATUS
, 1);
762 flowmode
= 1; /* default flow control state */
763 restartany
= -1; /* uninitialized... */
764 send_do(TELOPT_LFLOW
, 1);
767 * Spin, waiting for a response from the DO ECHO. However,
768 * some REALLY DUMB telnets out there might not respond
769 * to the DO ECHO. So, we spin looking for NAWS, (most dumb
770 * telnets so far seem to respond with WONT for a DO that
771 * they don't understand...) because by the time we get the
772 * response, it will already have processed the DO ECHO.
773 * Kludge upon kludge.
775 while (his_will_wont_is_changing(TELOPT_NAWS
))
780 * The client might have sent a WILL NAWS as part of its
781 * startup code; if so, we'll be here before we get the
782 * response to the DO ECHO. We'll make the assumption
783 * that any implementation that understands about NAWS
784 * is a modern enough implementation that it will respond
785 * to our DO ECHO request; hence we'll do another spin
786 * waiting for the ECHO option to settle down, which is
787 * what we wanted to do in the first place...
789 if (his_want_state_is_will(TELOPT_ECHO
) &&
790 his_state_is_will(TELOPT_NAWS
)) {
791 while (his_will_wont_is_changing(TELOPT_ECHO
))
795 * On the off chance that the telnet client is broken and does not
796 * respond to the DO ECHO we sent, (after all, we did send the
797 * DO NAWS negotiation after the DO ECHO, and we won't get here
798 * until a response to the DO NAWS comes back) simulate the
799 * receipt of a will echo. This will also send a WONT ECHO
800 * to the client, since we assume that the client failed to
801 * respond because it believes that it is already in DO ECHO
802 * mode, which we do not want.
804 if (his_want_state_is_will(TELOPT_ECHO
)) {
805 DIAG(TD_OPTIONS
, output_data("td: simulating recv\r\n"));
806 willoption(TELOPT_ECHO
);
810 * Finally, to clean things up, we turn on our echo. This
811 * will break stupid 4.2 telnets out of local terminal echo.
814 if (my_state_is_wont(TELOPT_ECHO
))
815 send_will(TELOPT_ECHO
, 1);
818 * Turn on packet mode
820 (void) ioctl(p
, TIOCPKT
, (char *)&on
);
822 #if defined(LINEMODE) && defined(KLUDGELINEMODE)
824 * Continuing line mode support. If client does not support
825 * real linemode, attempt to negotiate kludge linemode by sending
826 * the do timing mark sequence.
828 if (lmodetype
< REAL_LINEMODE
)
829 send_do(TELOPT_TM
, 1);
830 #endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */
833 * Call telrcv() once to pick up anything received during
834 * terminal type negotiation, 4.2/4.3 determination, and
835 * linemode negotiation.
839 (void) ioctl(f
, FIONBIO
, (char *)&on
);
840 (void) ioctl(p
, FIONBIO
, (char *)&on
);
842 #if defined(SO_OOBINLINE)
843 (void) setsockopt(net
, SOL_SOCKET
, SO_OOBINLINE
,
844 (char *)&on
, sizeof on
);
845 #endif /* defined(SO_OOBINLINE) */
848 (void) signal(SIGTSTP
, SIG_IGN
);
852 * Ignoring SIGTTOU keeps the kernel from blocking us
853 * in ttioct() in /sys/tty.c.
855 (void) signal(SIGTTOU
, SIG_IGN
);
858 (void) signal(SIGCHLD
, cleanup
);
863 t
= open(_PATH_TTY
, O_RDWR
);
865 (void) ioctl(t
, TIOCNOTTY
, NULL
);
872 * Show banner that getty never gave.
874 * We put the banner in the pty input buffer. This way, it
875 * gets carriage return null processing, etc., just like all
876 * other pty --> client data.
879 if (getent(defent
, "default") == 1) {
882 HE
= Getstr("he", &cp
);
883 HN
= Getstr("hn", &cp
);
884 IM
= Getstr("im", &cp
);
886 (void) strlcpy(host_name
, HN
, sizeof(host_name
));
890 IM
= strdup(DEFAULT_IM
);
893 edithost(HE
, host_name
);
898 (void) strncat(ptyibuf2
, ptyip
, pcc
+1);
903 * Last check to make sure all our states are correct.
907 #endif /* LINEMODE */
909 DIAG(TD_REPORT
, output_data("td: Entering processing loop\r\n"));
912 * Startup the login process on the slave side of the terminal
913 * now. We delay this until here to insure option negotiation
916 startslave(host
, level
, user_name
);
918 nfd
= ((f
> p
) ? f
: p
) + 1;
920 fd_set ibits
, obits
, xbits
;
923 if (ncc
< 0 && pcc
< 0)
930 * Never look for input if there's still
931 * stuff in the corresponding output buffer
933 if (nfrontp
- nbackp
|| pcc
> 0) {
938 if (pfrontp
- pbackp
|| ncc
> 0) {
946 if ((c
= select(nfd
, &ibits
, &obits
, &xbits
, NULL
)) < 1) {
948 if (errno
== EINTR
) {
959 if (FD_ISSET(net
, &xbits
)) {
964 * Something to read from the network...
966 if (FD_ISSET(net
, &ibits
)) {
967 #if !defined(SO_OOBINLINE)
969 * In 4.2 (and 4.3 beta) systems, the
970 * OOB indication and data handling in the kernel
971 * is such that if two separate TCP Urgent requests
972 * come in, one byte of TCP data will be overlaid.
973 * This is fatal for Telnet, but we try to live
976 * In addition, in 4.2 (and...), a special protocol
977 * is needed to pick up the TCP Urgent data in
978 * the correct sequence.
980 * What we do is: if we think we are in urgent
981 * mode, we look to see if we are "at the mark".
982 * If we are, we do an OOB receive. If we run
983 * this twice, we will do the OOB receive twice,
984 * but the second will fail, since the second
985 * time we were "at the mark", but there wasn't
986 * any data there (the kernel doesn't reset
987 * "at the mark" until we do a normal read).
988 * Once we've read the OOB data, we go ahead
989 * and do normal reads.
991 * There is also another problem, which is that
992 * since the OOB byte we read doesn't put us
993 * out of OOB state, and since that byte is most
994 * likely the TELNET DM (data mark), we would
995 * stay in the TELNET SYNCH (SYNCHing) state.
996 * So, clocks to the rescue. If we've "just"
997 * received a DM, then we test for the
998 * presence of OOB data when the receive OOB
999 * fails (and AFTER we did the normal mode read
1000 * to clear "at the mark").
1005 (void) ioctl(net
, SIOCATMARK
, (char *)&atmark
);
1007 ncc
= recv(net
, netibuf
, sizeof (netibuf
), MSG_OOB
);
1008 if ((ncc
== -1) && (errno
== EINVAL
)) {
1009 ncc
= read(net
, netibuf
, sizeof (netibuf
));
1010 if (sequenceIs(didnetreceive
, gotDM
)) {
1011 SYNCHing
= stilloob(net
);
1015 ncc
= read(net
, netibuf
, sizeof (netibuf
));
1018 ncc
= read(net
, netibuf
, sizeof (netibuf
));
1020 settimer(didnetreceive
);
1021 #else /* !defined(SO_OOBINLINE)) */
1022 ncc
= read(net
, netibuf
, sizeof (netibuf
));
1023 #endif /* !defined(SO_OOBINLINE)) */
1024 if (ncc
< 0 && errno
== EWOULDBLOCK
)
1032 DIAG((TD_REPORT
| TD_NETDATA
),
1033 output_data("td: netread %d chars\r\n", ncc
));
1034 DIAG(TD_NETDATA
, printdata("nd", netip
, ncc
));
1038 * Something to read from the pty...
1040 if (FD_ISSET(p
, &ibits
)) {
1041 pcc
= read(p
, ptyibuf
, BUFSIZ
);
1043 * On some systems, if we try to read something
1044 * off the master side before the slave side is
1045 * opened, we get EIO.
1047 if (pcc
< 0 && (errno
== EWOULDBLOCK
||
1058 * If ioctl from pty, pass it through net
1060 if (ptyibuf
[0] & TIOCPKT_IOCTL
) {
1061 copy_termbuf(ptyibuf
+1, pcc
-1);
1065 #endif /* LINEMODE */
1066 if (ptyibuf
[0] & TIOCPKT_FLUSHWRITE
) {
1067 netclear(); /* clear buffer back */
1070 * There are client telnets on some
1071 * operating systems get screwed up
1072 * royally if we send them urgent
1075 output_data("%c%c", IAC
, DM
);
1076 neturg
= nfrontp
-1; /* off by one XXX */
1078 printoption("td: send IAC", DM
));
1082 if (his_state_is_will(TELOPT_LFLOW
) &&
1084 (TIOCPKT_NOSTOP
|TIOCPKT_DOSTOP
))) {
1086 ptyibuf
[0] & TIOCPKT_DOSTOP
? 1 : 0;
1087 if (newflow
!= flowmode
) {
1089 output_data("%c%c%c%c%c%c",
1090 IAC
, SB
, TELOPT_LFLOW
,
1094 DIAG(TD_OPTIONS
, printsub('>',
1095 (unsigned char *)nfrontp
-4,
1105 if ((&netobuf
[BUFSIZ
] - nfrontp
) < 2)
1107 c
= *ptyip
++ & 0377, pcc
--;
1109 output_data("%c", c
);
1110 output_data("%c", c
);
1111 if ((c
== '\r') && (my_state_is_wont(TELOPT_BINARY
))) {
1112 if (pcc
> 0 && ((*ptyip
& 0377) == '\n')) {
1113 output_data("%c", *ptyip
++ & 0377);
1116 output_data("%c", '\0');
1120 if (FD_ISSET(f
, &obits
) && (nfrontp
- nbackp
) > 0)
1124 if (FD_ISSET(p
, &obits
) && (pfrontp
- pbackp
) > 0)
1128 } /* end of telnet */
1132 # define TCSIG TIOCSIG
1137 * Send interrupt to process on other side of pty.
1138 * If it is in raw mode, just write NULL;
1139 * otherwise, write intr char.
1144 ptyflush(); /* half-hearted */
1147 (void) ioctl(pty
, TCSIG
, (char *)SIGINT
);
1150 *pfrontp
++ = slctab
[SLC_IP
].sptr
?
1151 (unsigned char)*slctab
[SLC_IP
].sptr
: '\177';
1156 * Send quit to process on other side of pty.
1157 * If it is in raw mode, just write NULL;
1158 * otherwise, write quit char.
1163 ptyflush(); /* half-hearted */
1165 (void) ioctl(pty
, TCSIG
, (char *)SIGQUIT
);
1168 *pfrontp
++ = slctab
[SLC_ABORT
].sptr
?
1169 (unsigned char)*slctab
[SLC_ABORT
].sptr
: '\034';
1177 ptyflush(); /* half-hearted */
1179 (void) ioctl(pty
, TCSIG
, (char *)SIGTSTP
);
1181 *pfrontp
++ = slctab
[SLC_SUSP
].sptr
?
1182 (unsigned char)*slctab
[SLC_SUSP
].sptr
: '\032';
1184 #endif /* SIGTSTP */
1188 * When we get an AYT, if ^T is enabled, use that. Otherwise,
1189 * just send back "[Yes]".
1194 #if defined(SIGINFO) && defined(TCSIG)
1195 if (slctab
[SLC_AYT
].sptr
&& *slctab
[SLC_AYT
].sptr
!= _POSIX_VDISABLE
) {
1196 (void) ioctl(pty
, TCSIG
, (char *)SIGINFO
);
1200 output_data("\r\n[Yes]\r\n");
1208 #if defined(LINEMODE) && defined(USE_TERMIO) && (VEOF == VMIN)
1209 if (!tty_isediting()) {
1210 extern char oldeofc
;
1211 *pfrontp
++ = oldeofc
;
1215 *pfrontp
++ = slctab
[SLC_EOF
].sptr
?
1216 (unsigned char)*slctab
[SLC_EOF
].sptr
: '\004';