btrfs: Attempt to fix GCC2 build.
[haiku.git] / src / bin / network / telnetd / telnetd.c
blobf724f7f2b63412281fb0a814498bca8c33a83d7d
1 /*
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
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.
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.
34 #if 0
35 #ifndef lint
36 static const char sccsid[] = "@(#)telnetd.c 8.4 (Berkeley) 5/30/95";
37 #endif
38 #endif
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD: src/contrib/telnet/telnetd/telnetd.c,v 1.28 2005/05/21 15:28:42 ume Exp $");
42 #include "telnetd.h"
43 #include "pathnames.h"
45 //#include <sys/mman.h>
46 #include <err.h>
47 #include <libutil.h>
48 #include <paths.h>
49 #include <termcap.h>
50 #if (!defined(__BEOS__) && !defined(__HAIKU__))
51 # include <utmp.h>
52 #endif
54 #include <arpa/inet.h>
56 #ifdef AUTHENTICATION
57 #include <libtelnet/auth.h>
58 int auth_level = 0;
59 #endif
60 #ifdef ENCRYPTION
61 #include <libtelnet/encrypt.h>
62 #endif
63 #include <libtelnet/misc.h>
65 char remote_hostname[MAXHOSTNAMELEN];
66 size_t utmp_len = sizeof(remote_hostname) - 1;
67 int registerd_host_only = 0;
71 * I/O data buffers,
72 * pointers, and counters.
74 char ptyibuf[BUFSIZ], *ptyip = ptyibuf;
75 char ptyibuf2[BUFSIZ];
77 int readstream(int, char *, int);
78 void doit(struct sockaddr *);
79 int terminaltypeok(char *);
81 int hostinfo = 1; /* do we print login banner? */
83 static int debug = 0;
84 int keepalive = 1;
85 const char *altlogin;
87 void doit(struct sockaddr *);
88 int terminaltypeok(char *);
89 void startslave(char *, int, char *);
90 extern void usage(void);
91 static void _gettermname(void);
94 * The string to pass to getopt(). We do it this way so
95 * that only the actual options that we support will be
96 * passed off to getopt().
98 char valid_opts[] = {
99 'd', ':', 'h', 'k', 'n', 'p', ':', 'S', ':', 'u', ':', 'U',
100 '4', '6',
101 #ifdef AUTHENTICATION
102 'a', ':', 'X', ':',
103 #endif
104 #ifdef BFTPDAEMON
105 'B',
106 #endif
107 #ifdef DIAGNOSTICS
108 'D', ':',
109 #endif
110 #ifdef ENCRYPTION
111 'e', ':',
112 #endif
113 #ifdef LINEMODE
114 'l',
115 #endif
116 '\0'
119 int family = AF_INET;
121 #ifndef MAXHOSTNAMELEN
122 #define MAXHOSTNAMELEN 256
123 #endif /* MAXHOSTNAMELEN */
125 char *hostname;
126 char host_name[MAXHOSTNAMELEN];
128 extern void telnet(int, int, char *);
130 int level;
131 char user_name[256];
134 main(int argc, char *argv[])
136 struct sockaddr_storage from;
137 int on = 1, fromlen;
138 int ch;
139 #if (!defined(__BEOS__) && !defined(__HAIKU__))
140 u_long ultmp;
141 char *ep;
142 #endif
143 #if defined(IPPROTO_IP) && defined(IP_TOS)
144 int tos = -1;
145 #endif
147 pfrontp = pbackp = ptyobuf;
148 netip = netibuf;
149 nfrontp = nbackp = netobuf;
150 #ifdef ENCRYPTION
151 nclearto = 0;
152 #endif /* ENCRYPTION */
155 * This initialization causes linemode to default to a configuration
156 * that works on all telnet clients, including the FreeBSD client.
157 * This is not quite the same as the telnet client issuing a "mode
158 * character" command, but has most of the same benefits, and is
159 * preferable since some clients (like usofts) don't have the
160 * mode character command anyway and linemode breaks things.
161 * The most notable symptom of fix is that csh "set filec" operations
162 * like <ESC> (filename completion) and ^D (choices) keys now work
163 * in telnet sessions and can be used more than once on the same line.
164 * CR/LF handling is also corrected in some termio modes. This
165 * change resolves problem reports bin/771 and bin/1037.
168 linemode=1; /*Default to mode that works on bulk of clients*/
170 while ((ch = getopt(argc, argv, valid_opts)) != -1) {
171 switch(ch) {
173 #ifdef AUTHENTICATION
174 case 'a':
176 * Check for required authentication level
178 if (strcmp(optarg, "debug") == 0) {
179 extern int auth_debug_mode;
180 auth_debug_mode = 1;
181 } else if (strcasecmp(optarg, "none") == 0) {
182 auth_level = 0;
183 } else if (strcasecmp(optarg, "other") == 0) {
184 auth_level = AUTH_OTHER;
185 } else if (strcasecmp(optarg, "user") == 0) {
186 auth_level = AUTH_USER;
187 } else if (strcasecmp(optarg, "valid") == 0) {
188 auth_level = AUTH_VALID;
189 } else if (strcasecmp(optarg, "off") == 0) {
191 * This hack turns off authentication
193 auth_level = -1;
194 } else {
195 warnx("unknown authorization level for -a");
197 break;
198 #endif /* AUTHENTICATION */
200 #ifdef BFTPDAEMON
201 case 'B':
202 bftpd++;
203 break;
204 #endif /* BFTPDAEMON */
206 case 'd':
207 if (strcmp(optarg, "ebug") == 0) {
208 debug++;
209 break;
211 usage();
212 /* NOTREACHED */
213 break;
215 #ifdef DIAGNOSTICS
216 case 'D':
218 * Check for desired diagnostics capabilities.
220 if (!strcmp(optarg, "report")) {
221 diagnostic |= TD_REPORT|TD_OPTIONS;
222 } else if (!strcmp(optarg, "exercise")) {
223 diagnostic |= TD_EXERCISE;
224 } else if (!strcmp(optarg, "netdata")) {
225 diagnostic |= TD_NETDATA;
226 } else if (!strcmp(optarg, "ptydata")) {
227 diagnostic |= TD_PTYDATA;
228 } else if (!strcmp(optarg, "options")) {
229 diagnostic |= TD_OPTIONS;
230 } else {
231 usage();
232 /* NOT REACHED */
234 break;
235 #endif /* DIAGNOSTICS */
237 #ifdef ENCRYPTION
238 case 'e':
239 if (strcmp(optarg, "debug") == 0) {
240 extern int encrypt_debug_mode;
241 encrypt_debug_mode = 1;
242 break;
244 usage();
245 /* NOTREACHED */
246 break;
247 #endif /* ENCRYPTION */
249 case 'h':
250 hostinfo = 0;
251 break;
253 #ifdef LINEMODE
254 case 'l':
255 alwayslinemode = 1;
256 break;
257 #endif /* LINEMODE */
259 case 'k':
260 #if defined(LINEMODE) && defined(KLUDGELINEMODE)
261 lmodetype = NO_AUTOKLUDGE;
262 #else
263 /* ignore -k option if built without kludge linemode */
264 #endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */
265 break;
267 case 'n':
268 keepalive = 0;
269 break;
271 case 'p':
272 altlogin = optarg;
273 break;
275 case 'S':
276 #if (defined(__BEOS__) || defined(__HAIKU__))
277 fprintf(stderr, "-S option is not supported\n");
278 #else
279 # ifdef HAS_GETTOS
280 if ((tos = parsetos(optarg, "tcp")) < 0)
281 warnx("%s%s%s",
282 "bad TOS argument '", optarg,
283 "'; will try to use default TOS");
284 # else
285 # define MAXTOS 255
286 ultmp = strtoul(optarg, &ep, 0);
287 if (*ep || ep == optarg || ultmp > MAXTOS)
288 warnx("%s%s%s",
289 "bad TOS argument '", optarg,
290 "'; will try to use default TOS");
291 else
292 tos = ultmp;
293 # endif
294 #endif /* !__BEOS__ */
295 break;
297 case 'u':
298 utmp_len = (size_t)atoi(optarg);
299 if (utmp_len >= sizeof(remote_hostname))
300 utmp_len = sizeof(remote_hostname) - 1;
301 break;
303 case 'U':
304 registerd_host_only = 1;
305 break;
307 #ifdef AUTHENTICATION
308 case 'X':
310 * Check for invalid authentication types
312 auth_disable_name(optarg);
313 break;
314 #endif /* AUTHENTICATION */
316 case '4':
317 family = AF_INET;
318 break;
320 #ifdef INET6
321 case '6':
322 family = AF_INET6;
323 break;
324 #endif
326 default:
327 warnx("%c: unknown option", ch);
328 /* FALLTHROUGH */
329 case '?':
330 usage();
331 /* NOTREACHED */
335 argc -= optind;
336 argv += optind;
338 if (debug) {
339 int s, ns, foo, error;
340 const char *service = "telnet";
341 struct addrinfo hints, *res;
343 if (argc > 1) {
344 usage();
345 /* NOT REACHED */
346 } else if (argc == 1)
347 service = *argv;
349 memset(&hints, 0, sizeof(hints));
350 hints.ai_flags = AI_PASSIVE;
351 hints.ai_family = family;
352 hints.ai_socktype = SOCK_STREAM;
353 hints.ai_protocol = 0;
354 error = getaddrinfo(NULL, service, &hints, &res);
356 if (error) {
357 errx(1, "tcp/%s: %s\n", service, gai_strerror(error));
358 if (error == EAI_SYSTEM)
359 errx(1, "tcp/%s: %s\n", service, strerror(errno));
360 usage();
363 s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
364 if (s < 0)
365 err(1, "socket");
366 (void) setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
367 (char *)&on, sizeof(on));
368 if (debug > 1)
369 (void) setsockopt(s, SOL_SOCKET, SO_DEBUG,
370 (char *)&on, sizeof(on));
371 if (bind(s, res->ai_addr, res->ai_addrlen) < 0)
372 err(1, "bind");
373 if (listen(s, 1) < 0)
374 err(1, "listen");
375 foo = res->ai_addrlen;
376 ns = accept(s, res->ai_addr, &foo);
377 if (ns < 0)
378 err(1, "accept");
379 (void) setsockopt(ns, SOL_SOCKET, SO_DEBUG,
380 (char *)&on, sizeof(on));
381 (void) dup2(ns, 0);
382 (void) close(ns);
383 (void) close(s);
384 #ifdef convex
385 } else if (argc == 1) {
386 ; /* VOID*/ /* Just ignore the host/port name */
387 #endif
388 } else if (argc > 0) {
389 usage();
390 /* NOT REACHED */
393 openlog("telnetd", LOG_PID | LOG_ODELAY, LOG_DAEMON);
394 fromlen = sizeof (from);
395 if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0) {
396 warn("getpeername");
397 _exit(1);
399 if (keepalive &&
400 setsockopt(0, SOL_SOCKET, SO_KEEPALIVE,
401 (char *)&on, sizeof (on)) < 0) {
402 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m");
405 #if defined(IPPROTO_IP) && defined(IP_TOS)
406 if (from.ss_family == AF_INET) {
407 # if defined(HAS_GETTOS)
408 struct tosent *tp;
409 if (tos < 0 && (tp = gettosbyname("telnet", "tcp")))
410 tos = tp->t_tos;
411 # endif
412 if (tos < 0)
413 tos = 020; /* Low Delay bit */
414 if (tos
415 && (setsockopt(0, IPPROTO_IP, IP_TOS,
416 (char *)&tos, sizeof(tos)) < 0)
417 && (errno != ENOPROTOOPT) )
418 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
420 #endif /* defined(IPPROTO_IP) && defined(IP_TOS) */
421 net = 0;
422 doit((struct sockaddr *)&from);
423 /* NOTREACHED */
424 return(0);
425 } /* end of main */
427 void
428 usage()
430 fprintf(stderr, "usage: telnetd");
431 #ifdef AUTHENTICATION
432 fprintf(stderr,
433 " [-4] [-6] [-a (debug|other|user|valid|off|none)]\n\t");
434 #endif
435 #ifdef BFTPDAEMON
436 fprintf(stderr, " [-B]");
437 #endif
438 fprintf(stderr, " [-debug]");
439 #ifdef DIAGNOSTICS
440 fprintf(stderr, " [-D (options|report|exercise|netdata|ptydata)]\n\t");
441 #endif
442 #ifdef AUTHENTICATION
443 fprintf(stderr, " [-edebug]");
444 #endif
445 fprintf(stderr, " [-h]");
446 #if defined(LINEMODE) && defined(KLUDGELINEMODE)
447 fprintf(stderr, " [-k]");
448 #endif
449 #ifdef LINEMODE
450 fprintf(stderr, " [-l]");
451 #endif
452 fprintf(stderr, " [-n]");
453 fprintf(stderr, "\n\t");
454 #ifdef HAS_GETTOS
455 fprintf(stderr, " [-S tos]");
456 #endif
457 #ifdef AUTHENTICATION
458 fprintf(stderr, " [-X auth-type]");
459 #endif
460 fprintf(stderr, " [-u utmp_hostname_length] [-U]");
461 fprintf(stderr, " [port]\n");
462 exit(1);
466 * getterminaltype
468 * Ask the other end to send along its terminal type and speed.
469 * Output is the variable terminaltype filled in.
471 static unsigned char ttytype_sbbuf[] = {
472 IAC, SB, TELOPT_TTYPE, TELQUAL_SEND, IAC, SE
476 #ifndef AUTHENTICATION
477 #define undef2 __unused
478 #else
479 #define undef2
480 #endif
482 static int
483 getterminaltype(char *name undef2)
485 int retval = -1;
487 settimer(baseline);
488 #ifdef AUTHENTICATION
490 * Handle the Authentication option before we do anything else.
492 send_do(TELOPT_AUTHENTICATION, 1);
493 while (his_will_wont_is_changing(TELOPT_AUTHENTICATION))
494 ttloop();
495 if (his_state_is_will(TELOPT_AUTHENTICATION)) {
496 retval = auth_wait(name);
498 #endif
500 #ifdef ENCRYPTION
501 send_will(TELOPT_ENCRYPT, 1);
502 #endif /* ENCRYPTION */
503 send_do(TELOPT_TTYPE, 1);
504 send_do(TELOPT_TSPEED, 1);
505 send_do(TELOPT_XDISPLOC, 1);
506 send_do(TELOPT_NEW_ENVIRON, 1);
507 send_do(TELOPT_OLD_ENVIRON, 1);
508 while (
509 #ifdef ENCRYPTION
510 his_do_dont_is_changing(TELOPT_ENCRYPT) ||
511 #endif /* ENCRYPTION */
512 his_will_wont_is_changing(TELOPT_TTYPE) ||
513 his_will_wont_is_changing(TELOPT_TSPEED) ||
514 his_will_wont_is_changing(TELOPT_XDISPLOC) ||
515 his_will_wont_is_changing(TELOPT_NEW_ENVIRON) ||
516 his_will_wont_is_changing(TELOPT_OLD_ENVIRON)) {
517 ttloop();
519 #ifdef ENCRYPTION
521 * Wait for the negotiation of what type of encryption we can
522 * send with. If autoencrypt is not set, this will just return.
524 if (his_state_is_will(TELOPT_ENCRYPT)) {
525 encrypt_wait();
527 #endif /* ENCRYPTION */
528 if (his_state_is_will(TELOPT_TSPEED)) {
529 static unsigned char sb[] =
530 { IAC, SB, TELOPT_TSPEED, TELQUAL_SEND, IAC, SE };
532 output_datalen(sb, sizeof sb);
533 DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2););
535 if (his_state_is_will(TELOPT_XDISPLOC)) {
536 static unsigned char sb[] =
537 { IAC, SB, TELOPT_XDISPLOC, TELQUAL_SEND, IAC, SE };
539 output_datalen(sb, sizeof sb);
540 DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2););
542 if (his_state_is_will(TELOPT_NEW_ENVIRON)) {
543 static unsigned char sb[] =
544 { IAC, SB, TELOPT_NEW_ENVIRON, TELQUAL_SEND, IAC, SE };
546 output_datalen(sb, sizeof sb);
547 DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2););
549 else if (his_state_is_will(TELOPT_OLD_ENVIRON)) {
550 static unsigned char sb[] =
551 { IAC, SB, TELOPT_OLD_ENVIRON, TELQUAL_SEND, IAC, SE };
553 output_datalen(sb, sizeof sb);
554 DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2););
556 if (his_state_is_will(TELOPT_TTYPE)) {
558 output_datalen(ttytype_sbbuf, sizeof ttytype_sbbuf);
559 DIAG(TD_OPTIONS, printsub('>', ttytype_sbbuf + 2,
560 sizeof ttytype_sbbuf - 2););
562 if (his_state_is_will(TELOPT_TSPEED)) {
563 while (sequenceIs(tspeedsubopt, baseline))
564 ttloop();
566 if (his_state_is_will(TELOPT_XDISPLOC)) {
567 while (sequenceIs(xdisplocsubopt, baseline))
568 ttloop();
570 if (his_state_is_will(TELOPT_NEW_ENVIRON)) {
571 while (sequenceIs(environsubopt, baseline))
572 ttloop();
574 if (his_state_is_will(TELOPT_OLD_ENVIRON)) {
575 while (sequenceIs(oenvironsubopt, baseline))
576 ttloop();
578 if (his_state_is_will(TELOPT_TTYPE)) {
579 char first[256], last[256];
581 while (sequenceIs(ttypesubopt, baseline))
582 ttloop();
585 * If the other side has already disabled the option, then
586 * we have to just go with what we (might) have already gotten.
588 if (his_state_is_will(TELOPT_TTYPE) && !terminaltypeok(terminaltype)) {
589 (void) strncpy(first, terminaltype, sizeof(first)-1);
590 first[sizeof(first)-1] = '\0';
591 for(;;) {
593 * Save the unknown name, and request the next name.
595 (void) strncpy(last, terminaltype, sizeof(last)-1);
596 last[sizeof(last)-1] = '\0';
597 _gettermname();
598 if (terminaltypeok(terminaltype))
599 break;
600 if ((strncmp(last, terminaltype, sizeof(last)) == 0) ||
601 his_state_is_wont(TELOPT_TTYPE)) {
603 * We've hit the end. If this is the same as
604 * the first name, just go with it.
606 if (strncmp(first, terminaltype, sizeof(first)) == 0)
607 break;
609 * Get the terminal name one more time, so that
610 * RFC1091 compliant telnets will cycle back to
611 * the start of the list.
613 _gettermname();
614 if (strncmp(first, terminaltype, sizeof(first)) != 0) {
615 (void) strncpy(terminaltype, first, sizeof(terminaltype)-1);
616 terminaltype[sizeof(terminaltype)-1] = '\0';
618 break;
623 return(retval);
624 } /* end of getterminaltype */
626 static void
627 _gettermname(void)
630 * If the client turned off the option,
631 * we can't send another request, so we
632 * just return.
634 if (his_state_is_wont(TELOPT_TTYPE))
635 return;
636 settimer(baseline);
637 output_datalen(ttytype_sbbuf, sizeof ttytype_sbbuf);
638 DIAG(TD_OPTIONS, printsub('>', ttytype_sbbuf + 2,
639 sizeof ttytype_sbbuf - 2););
640 while (sequenceIs(ttypesubopt, baseline))
641 ttloop();
645 terminaltypeok(char *s)
647 char buf[1024];
649 if (terminaltype == NULL)
650 return(1);
653 * tgetent() will return 1 if the type is known, and
654 * 0 if it is not known. If it returns -1, it couldn't
655 * open the database. But if we can't open the database,
656 * it won't help to say we failed, because we won't be
657 * able to verify anything else. So, we treat -1 like 1.
659 if (tgetent(buf, s) == 0)
660 return(0);
661 return(1);
665 * Get a pty, scan input lines.
667 void
668 doit(struct sockaddr *who)
670 int err_; /* XXX */
671 int ptynum;
674 * Find an available pty to use.
676 #ifndef convex
677 pty = getpty(&ptynum);
678 if (pty < 0)
679 fatal(net, "All network ports in use");
680 #else
681 for (;;) {
682 char *lp;
684 if ((lp = getpty()) == NULL)
685 fatal(net, "Out of ptys");
687 if ((pty = open(lp, 2)) >= 0) {
688 strlcpy(line,lp,sizeof(line));
689 line[5] = 't';
690 break;
693 #endif
695 /* get name of connected client */
696 if (realhostname_sa(remote_hostname, sizeof(remote_hostname) - 1,
697 who, who->sa_len) == HOSTNAME_INVALIDADDR && registerd_host_only)
698 fatal(net, "Couldn't resolve your address into a host name.\r\n\
699 Please contact your net administrator");
700 remote_hostname[sizeof(remote_hostname) - 1] = '\0';
702 #if (!defined(__BEOS__) && !defined(__HAIKU__))
703 trimdomain(remote_hostname, UT_HOSTSIZE);
704 #endif
705 if (!isdigit(remote_hostname[0]) && strlen(remote_hostname) > utmp_len)
706 err_ = getnameinfo(who, who->sa_len, remote_hostname,
707 sizeof(remote_hostname), NULL, 0,
708 NI_NUMERICHOST);
709 /* XXX: do 'err_' check */
711 (void) gethostname(host_name, sizeof(host_name) - 1);
712 host_name[sizeof(host_name) - 1] = '\0';
713 hostname = host_name;
715 #ifdef AUTHENTICATION
716 #ifdef ENCRYPTION
717 /* The above #ifdefs should actually be "or"'ed, not "and"'ed.
718 * This is a byproduct of needing "#ifdef" and not "#if defined()"
719 * for unifdef. XXX MarkM
721 auth_encrypt_init(hostname, remote_hostname, "TELNETD", 1);
722 #endif
723 #endif
725 init_env();
727 * get terminal type.
729 *user_name = 0;
730 level = getterminaltype(user_name);
731 setenv("TERM", terminaltype ? terminaltype : "network", 1);
733 telnet(net, pty, remote_hostname); /* begin server process */
735 /*NOTREACHED*/
736 } /* end of doit */
739 * Main loop. Select from pty and network, and
740 * hand data to telnet receiver finite state machine.
742 void
743 telnet(int f, int p, char *host)
745 int on = 1;
746 #define TABBUFSIZ 512
747 char defent[TABBUFSIZ];
748 char defstrs[TABBUFSIZ];
749 #undef TABBUFSIZ
750 char *HE;
751 char *HN;
752 char *IM;
753 int nfd;
756 * Initialize the slc mapping table.
758 get_slc_defaults();
761 * Do some tests where it is desireable to wait for a response.
762 * Rather than doing them slowly, one at a time, do them all
763 * at once.
765 if (my_state_is_wont(TELOPT_SGA))
766 send_will(TELOPT_SGA, 1);
768 * Is the client side a 4.2 (NOT 4.3) system? We need to know this
769 * because 4.2 clients are unable to deal with TCP urgent data.
771 * To find out, we send out a "DO ECHO". If the remote system
772 * answers "WILL ECHO" it is probably a 4.2 client, and we note
773 * that fact ("WILL ECHO" ==> that the client will echo what
774 * WE, the server, sends it; it does NOT mean that the client will
775 * echo the terminal input).
777 send_do(TELOPT_ECHO, 1);
779 #ifdef LINEMODE
780 if (his_state_is_wont(TELOPT_LINEMODE)) {
781 /* Query the peer for linemode support by trying to negotiate
782 * the linemode option.
784 linemode = 0;
785 editmode = 0;
786 send_do(TELOPT_LINEMODE, 1); /* send do linemode */
788 #endif /* LINEMODE */
791 * Send along a couple of other options that we wish to negotiate.
793 send_do(TELOPT_NAWS, 1);
794 send_will(TELOPT_STATUS, 1);
795 flowmode = 1; /* default flow control state */
796 restartany = -1; /* uninitialized... */
797 send_do(TELOPT_LFLOW, 1);
800 * Spin, waiting for a response from the DO ECHO. However,
801 * some REALLY DUMB telnets out there might not respond
802 * to the DO ECHO. So, we spin looking for NAWS, (most dumb
803 * telnets so far seem to respond with WONT for a DO that
804 * they don't understand...) because by the time we get the
805 * response, it will already have processed the DO ECHO.
806 * Kludge upon kludge.
808 while (his_will_wont_is_changing(TELOPT_NAWS))
809 ttloop();
812 * But...
813 * The client might have sent a WILL NAWS as part of its
814 * startup code; if so, we'll be here before we get the
815 * response to the DO ECHO. We'll make the assumption
816 * that any implementation that understands about NAWS
817 * is a modern enough implementation that it will respond
818 * to our DO ECHO request; hence we'll do another spin
819 * waiting for the ECHO option to settle down, which is
820 * what we wanted to do in the first place...
822 if (his_want_state_is_will(TELOPT_ECHO) &&
823 his_state_is_will(TELOPT_NAWS)) {
824 while (his_will_wont_is_changing(TELOPT_ECHO))
825 ttloop();
828 * On the off chance that the telnet client is broken and does not
829 * respond to the DO ECHO we sent, (after all, we did send the
830 * DO NAWS negotiation after the DO ECHO, and we won't get here
831 * until a response to the DO NAWS comes back) simulate the
832 * receipt of a will echo. This will also send a WONT ECHO
833 * to the client, since we assume that the client failed to
834 * respond because it believes that it is already in DO ECHO
835 * mode, which we do not want.
837 if (his_want_state_is_will(TELOPT_ECHO)) {
838 DIAG(TD_OPTIONS, output_data("td: simulating recv\r\n"));
839 willoption(TELOPT_ECHO);
843 * Finally, to clean things up, we turn on our echo. This
844 * will break stupid 4.2 telnets out of local terminal echo.
847 if (my_state_is_wont(TELOPT_ECHO))
848 send_will(TELOPT_ECHO, 1);
850 #if (!defined(__BEOS__) && !defined(__HAIKU__))
852 * Turn on packet mode
854 (void) ioctl(p, TIOCPKT, (char *)&on);
855 #endif
857 #if defined(LINEMODE) && defined(KLUDGELINEMODE)
859 * Continuing line mode support. If client does not support
860 * real linemode, attempt to negotiate kludge linemode by sending
861 * the do timing mark sequence.
863 if (lmodetype < REAL_LINEMODE)
864 send_do(TELOPT_TM, 1);
865 #endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */
868 * Call telrcv() once to pick up anything received during
869 * terminal type negotiation, 4.2/4.3 determination, and
870 * linemode negotiation.
872 telrcv();
874 (void) ioctl(f, FIONBIO, (char *)&on);
875 (void) ioctl(p, FIONBIO, (char *)&on);
877 #if defined(SO_OOBINLINE)
878 (void) setsockopt(net, SOL_SOCKET, SO_OOBINLINE,
879 (char *)&on, sizeof on);
880 #endif /* defined(SO_OOBINLINE) */
882 #ifdef SIGTSTP
883 (void) signal(SIGTSTP, SIG_IGN);
884 #endif
885 #ifdef SIGTTOU
887 * Ignoring SIGTTOU keeps the kernel from blocking us
888 * in ttioct() in /sys/tty.c.
890 (void) signal(SIGTTOU, SIG_IGN);
891 #endif
893 (void) signal(SIGCHLD, cleanup);
895 #ifdef TIOCNOTTY
897 int t;
898 t = open(_PATH_TTY, O_RDWR);
899 if (t >= 0) {
900 (void) ioctl(t, TIOCNOTTY, (char *)0);
901 (void) close(t);
904 #endif
907 * Show banner that getty never gave.
909 * We put the banner in the pty input buffer. This way, it
910 * gets carriage return null processing, etc., just like all
911 * other pty --> client data.
914 if (getent(defent, "default") == 1) {
915 char *cp=defstrs;
917 HE = Getstr("he", &cp);
918 HN = Getstr("hn", &cp);
919 IM = Getstr("im", &cp);
920 if (HN && *HN)
921 (void) strlcpy(host_name, HN, sizeof(host_name));
922 if (IM == 0)
923 IM = strdup("");
924 } else {
925 IM = strdup(DEFAULT_IM);
926 HE = 0;
928 edithost(HE, host_name);
929 if (hostinfo && *IM)
930 putf(IM, ptyibuf2);
932 if (pcc)
933 (void) strncat(ptyibuf2, ptyip, pcc+1);
934 ptyip = ptyibuf2;
935 pcc = strlen(ptyip);
936 #ifdef LINEMODE
938 * Last check to make sure all our states are correct.
940 init_termbuf();
941 localstat();
942 #endif /* LINEMODE */
944 DIAG(TD_REPORT, output_data("td: Entering processing loop\r\n"));
947 * Startup the login process on the slave side of the terminal
948 * now. We delay this until here to insure option negotiation
949 * is complete.
951 startslave(host, level, user_name);
953 nfd = ((f > p) ? f : p) + 1;
954 for (;;) {
955 fd_set ibits, obits, xbits;
956 int c;
958 if (ncc < 0 && pcc < 0)
959 break;
961 FD_ZERO(&ibits);
962 FD_ZERO(&obits);
963 FD_ZERO(&xbits);
965 * Never look for input if there's still
966 * stuff in the corresponding output buffer
968 if (nfrontp - nbackp || pcc > 0) {
969 FD_SET(f, &obits);
970 } else {
971 FD_SET(p, &ibits);
973 if (pfrontp - pbackp || ncc > 0) {
974 FD_SET(p, &obits);
975 } else {
976 FD_SET(f, &ibits);
978 if (!SYNCHing) {
979 FD_SET(f, &xbits);
981 if ((c = select(nfd, &ibits, &obits, &xbits,
982 (struct timeval *)0)) < 1) {
983 if (c == -1) {
984 if (errno == EINTR) {
985 continue;
988 sleep(5);
989 continue;
993 * Any urgent data?
995 if (FD_ISSET(net, &xbits)) {
996 SYNCHing = 1;
1000 * Something to read from the network...
1002 if (FD_ISSET(net, &ibits)) {
1003 #if !defined(SO_OOBINLINE)
1005 * In 4.2 (and 4.3 beta) systems, the
1006 * OOB indication and data handling in the kernel
1007 * is such that if two separate TCP Urgent requests
1008 * come in, one byte of TCP data will be overlaid.
1009 * This is fatal for Telnet, but we try to live
1010 * with it.
1012 * In addition, in 4.2 (and...), a special protocol
1013 * is needed to pick up the TCP Urgent data in
1014 * the correct sequence.
1016 * What we do is: if we think we are in urgent
1017 * mode, we look to see if we are "at the mark".
1018 * If we are, we do an OOB receive. If we run
1019 * this twice, we will do the OOB receive twice,
1020 * but the second will fail, since the second
1021 * time we were "at the mark", but there wasn't
1022 * any data there (the kernel doesn't reset
1023 * "at the mark" until we do a normal read).
1024 * Once we've read the OOB data, we go ahead
1025 * and do normal reads.
1027 * There is also another problem, which is that
1028 * since the OOB byte we read doesn't put us
1029 * out of OOB state, and since that byte is most
1030 * likely the TELNET DM (data mark), we would
1031 * stay in the TELNET SYNCH (SYNCHing) state.
1032 * So, clocks to the rescue. If we've "just"
1033 * received a DM, then we test for the
1034 * presence of OOB data when the receive OOB
1035 * fails (and AFTER we did the normal mode read
1036 * to clear "at the mark").
1038 if (SYNCHing) {
1039 int atmark;
1041 (void) ioctl(net, SIOCATMARK, (char *)&atmark);
1042 if (atmark) {
1043 ncc = recv(net, netibuf, sizeof (netibuf), MSG_OOB);
1044 if ((ncc == -1) && (errno == EINVAL)) {
1045 ncc = read(net, netibuf, sizeof (netibuf));
1046 if (sequenceIs(didnetreceive, gotDM)) {
1047 SYNCHing = stilloob(net);
1050 } else {
1051 ncc = read(net, netibuf, sizeof (netibuf));
1053 } else {
1054 ncc = read(net, netibuf, sizeof (netibuf));
1056 settimer(didnetreceive);
1057 #else /* !defined(SO_OOBINLINE)) */
1058 ncc = read(net, netibuf, sizeof (netibuf));
1059 #endif /* !defined(SO_OOBINLINE)) */
1060 if (ncc < 0 && errno == EWOULDBLOCK)
1061 ncc = 0;
1062 else {
1063 if (ncc <= 0) {
1064 break;
1066 netip = netibuf;
1068 DIAG((TD_REPORT | TD_NETDATA),
1069 output_data("td: netread %d chars\r\n", ncc));
1070 DIAG(TD_NETDATA, printdata("nd", netip, ncc));
1074 * Something to read from the pty...
1076 if (FD_ISSET(p, &ibits)) {
1077 pcc = read(p, ptyibuf, BUFSIZ);
1079 * On some systems, if we try to read something
1080 * off the master side before the slave side is
1081 * opened, we get EIO.
1083 if (pcc < 0 && (errno == EWOULDBLOCK ||
1084 #ifdef EAGAIN
1085 errno == EAGAIN ||
1086 #endif
1087 errno == EIO)) {
1088 pcc = 0;
1089 } else {
1090 if (pcc <= 0)
1091 break;
1092 #ifdef LINEMODE
1094 * If ioctl from pty, pass it through net
1096 if (ptyibuf[0] & TIOCPKT_IOCTL) {
1097 copy_termbuf(ptyibuf+1, pcc-1);
1098 localstat();
1099 pcc = 1;
1101 #endif /* LINEMODE */
1102 #if (!defined(__BEOS__) && !defined(__HAIKU__))
1103 if (ptyibuf[0] & TIOCPKT_FLUSHWRITE) {
1104 netclear(); /* clear buffer back */
1105 # ifndef NO_URGENT
1107 * There are client telnets on some
1108 * operating systems get screwed up
1109 * royally if we send them urgent
1110 * mode data.
1112 output_data("%c%c", IAC, DM);
1113 neturg = nfrontp-1; /* off by one XXX */
1114 DIAG(TD_OPTIONS,
1115 printoption("td: send IAC", DM));
1117 # endif
1119 if (his_state_is_will(TELOPT_LFLOW) &&
1120 (ptyibuf[0] &
1121 (TIOCPKT_NOSTOP|TIOCPKT_DOSTOP))) {
1122 int newflow =
1123 ptyibuf[0] & TIOCPKT_DOSTOP ? 1 : 0;
1124 if (newflow != flowmode) {
1125 flowmode = newflow;
1126 output_data("%c%c%c%c%c%c",
1127 IAC, SB, TELOPT_LFLOW,
1128 flowmode ? LFLOW_ON
1129 : LFLOW_OFF,
1130 IAC, SE);
1131 DIAG(TD_OPTIONS, printsub('>',
1132 (unsigned char *)nfrontp-4,
1133 4););
1136 pcc--;
1137 #endif /* !__BEOS__ */
1138 //ptyip = ptyibuf+1;
1139 ptyip = ptyibuf;
1143 while (pcc > 0) {
1144 if ((&netobuf[BUFSIZ] - nfrontp) < 2)
1145 break;
1146 c = *ptyip++ & 0377, pcc--;
1147 if (c == IAC)
1148 output_data("%c", c);
1149 output_data("%c", c);
1150 if ((c == '\r') && (my_state_is_wont(TELOPT_BINARY))) {
1151 if (pcc > 0 && ((*ptyip & 0377) == '\n')) {
1152 output_data("%c", *ptyip++ & 0377);
1153 pcc--;
1154 } else
1155 output_data("%c", '\0');
1159 if (FD_ISSET(f, &obits) && (nfrontp - nbackp) > 0)
1160 netflush();
1161 if (ncc > 0)
1162 telrcv();
1163 if (FD_ISSET(p, &obits) && (pfrontp - pbackp) > 0)
1164 ptyflush();
1166 cleanup(0);
1167 } /* end of telnet */
1169 #ifndef TCSIG
1170 # ifdef TIOCSIG
1171 # define TCSIG TIOCSIG
1172 # endif
1173 #endif
1176 * Send interrupt to process on other side of pty.
1177 * If it is in raw mode, just write NULL;
1178 * otherwise, write intr char.
1180 void
1181 interrupt(void)
1183 ptyflush(); /* half-hearted */
1185 #ifdef TCSIG
1186 (void) ioctl(pty, TCSIG, (char *)SIGINT);
1187 #else /* TCSIG */
1188 init_termbuf();
1189 *pfrontp++ = slctab[SLC_IP].sptr ?
1190 (unsigned char)*slctab[SLC_IP].sptr : '\177';
1191 #endif /* TCSIG */
1195 * Send quit to process on other side of pty.
1196 * If it is in raw mode, just write NULL;
1197 * otherwise, write quit char.
1199 void
1200 sendbrk(void)
1202 ptyflush(); /* half-hearted */
1203 #ifdef TCSIG
1204 (void) ioctl(pty, TCSIG, (char *)SIGQUIT);
1205 #else /* TCSIG */
1206 init_termbuf();
1207 *pfrontp++ = slctab[SLC_ABORT].sptr ?
1208 (unsigned char)*slctab[SLC_ABORT].sptr : '\034';
1209 #endif /* TCSIG */
1212 void
1213 sendsusp(void)
1215 #ifdef SIGTSTP
1216 ptyflush(); /* half-hearted */
1217 # ifdef TCSIG
1218 (void) ioctl(pty, TCSIG, (char *)SIGTSTP);
1219 # else /* TCSIG */
1220 *pfrontp++ = slctab[SLC_SUSP].sptr ?
1221 (unsigned char)*slctab[SLC_SUSP].sptr : '\032';
1222 # endif /* TCSIG */
1223 #endif /* SIGTSTP */
1227 * When we get an AYT, if ^T is enabled, use that. Otherwise,
1228 * just send back "[Yes]".
1230 void
1231 recv_ayt(void)
1233 #if defined(SIGINFO) && defined(TCSIG)
1234 if (slctab[SLC_AYT].sptr && *slctab[SLC_AYT].sptr != _POSIX_VDISABLE) {
1235 (void) ioctl(pty, TCSIG, (char *)SIGINFO);
1236 return;
1238 #endif
1239 output_data("\r\n[Yes]\r\n");
1242 void
1243 doeof(void)
1245 init_termbuf();
1247 #if defined(LINEMODE) && defined(USE_TERMIO) && (VEOF == VMIN)
1248 if (!tty_isediting()) {
1249 extern char oldeofc;
1250 *pfrontp++ = oldeofc;
1251 return;
1253 #endif
1254 *pfrontp++ = slctab[SLC_EOF].sptr ?
1255 (unsigned char)*slctab[SLC_EOF].sptr : '\004';