Commit | Line | Data |
---|---|---|
8c5eec2f | 1 | /* |
ea139302 | 2 | * Copyright (c) 1989 Regents of the University of California. |
897ce52e KB |
3 | * All rights reserved. |
4 | * | |
5 | * Redistribution and use in source and binary forms are permitted | |
b8c620d6 KB |
6 | * provided that the above copyright notice and this paragraph are |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
8c5eec2f DF |
16 | */ |
17 | ||
18 | #ifndef lint | |
19 | char copyright[] = | |
ea139302 | 20 | "@(#) Copyright (c) 1989 Regents of the University of California.\n\ |
8c5eec2f | 21 | All rights reserved.\n"; |
897ce52e | 22 | #endif /* not lint */ |
8c5eec2f | 23 | |
ac6e6727 | 24 | #ifndef lint |
86b6dfea | 25 | static char sccsid[] = "@(#)telnetd.c 5.39 (Berkeley) %G%"; |
897ce52e | 26 | #endif /* not lint */ |
ac6e6727 | 27 | |
ea139302 | 28 | #include "telnetd.h" |
66b878f6 BJ |
29 | |
30 | /* | |
ea139302 PB |
31 | * I/O data buffers, |
32 | * pointers, and counters. | |
66b878f6 BJ |
33 | */ |
34 | char ptyibuf[BUFSIZ], *ptyip = ptyibuf; | |
ea139302 | 35 | char ptyibuf2[BUFSIZ]; |
affdaa4e | 36 | |
ea139302 PB |
37 | #ifdef CRAY |
38 | int hostinfo = 1; /* do we print login banner? */ | |
39 | #endif | |
affdaa4e | 40 | |
ea139302 PB |
41 | #ifdef CRAY |
42 | extern int newmap; /* nonzero if \n maps to ^M^J */ | |
43 | int lowpty = 0, highpty = 128; /* low, high pty numbers */ | |
44 | #endif /* CRAY */ | |
affdaa4e | 45 | |
ea139302 PB |
46 | int debug = 0; |
47 | char *progname; | |
66b878f6 | 48 | |
66b878f6 BJ |
49 | main(argc, argv) |
50 | char *argv[]; | |
51 | { | |
bb933cc2 | 52 | struct sockaddr_in from; |
bcb894cb | 53 | int on = 1, fromlen; |
bb933cc2 | 54 | |
ea139302 PB |
55 | pfrontp = pbackp = ptyobuf; |
56 | netip = netibuf; | |
57 | nfrontp = nbackp = netobuf; | |
58 | ||
59 | progname = *argv; | |
60 | top: | |
61 | argc--, argv++; | |
62 | ||
63 | if (argc > 0 && strcmp(*argv, "-debug") == 0) { | |
64 | debug++; | |
65 | goto top; | |
66 | } | |
67 | ||
68 | #ifdef LINEMODE | |
69 | if (argc > 0 && !strcmp(*argv, "-l")) { | |
70 | alwayslinemode = 1; | |
71 | goto top; | |
72 | } | |
73 | #endif /* LINEMODE */ | |
74 | ||
75 | #ifdef CRAY | |
76 | if (argc > 0 && !strcmp(*argv, "-h")) { | |
77 | hostinfo = 0; | |
78 | goto top; | |
79 | } | |
80 | ||
81 | if (argc > 0 && !strncmp(*argv, "-r", 2)) { | |
82 | char *strchr(); | |
83 | char *c; | |
84 | ||
85 | *argv += 2; | |
86 | if (**argv == '\0' && argc) | |
87 | argv++, argc--; | |
88 | c = strchr(*argv, '-'); | |
89 | if (c) { | |
90 | *c++ = '\0'; | |
91 | highpty = atoi(c); | |
92 | } else | |
93 | highpty = -1; | |
94 | lowpty = atoi(*argv); | |
95 | if ((lowpty > highpty) || (lowpty < 0) || (highpty > 999)) { | |
96 | usage: | |
97 | fprintf(stderr, "Usage: telnetd [-debug] [-h] "); | |
98 | # ifdef NEWINIT | |
99 | fprintf(stderr, "[-Iinitid] "); | |
100 | # endif /* NEWINIT */ | |
101 | fprintf(stderr, "[-l] [-rlowpty-highpty] [port]\n"); | |
102 | exit(1); | |
103 | } | |
104 | goto top; | |
105 | } | |
106 | # ifdef NEWINIT | |
107 | if (argc > 0 && !strncmp(*argv, "-I", 2)) { | |
108 | extern char *gen_id; | |
109 | ||
110 | *argv += 2; | |
111 | if (**argv == '\0') { | |
112 | if (argc < 2) | |
113 | goto usage; | |
114 | argv++, argc--; | |
115 | if (**argv == '\0') | |
116 | goto usage; | |
117 | } | |
118 | gen_id = *argv; | |
119 | goto top; | |
120 | } | |
121 | # endif /* NEWINIT */ | |
122 | #endif /* CRAY */ | |
123 | ||
124 | if (debug) { | |
5d78ef73 GM |
125 | int s, ns, foo; |
126 | struct servent *sp; | |
127 | static struct sockaddr_in sin = { AF_INET }; | |
128 | ||
ea139302 PB |
129 | if (argc > 0) { |
130 | if (sp = getservbyname(*argv, "tcp")) { | |
131 | sin.sin_port = sp->s_port; | |
132 | } else { | |
133 | sin.sin_port = atoi(*argv); | |
134 | if ((int)sin.sin_port <= 0) { | |
135 | fprintf(stderr, "telnetd: %s: bad port #\n", *argv); | |
136 | exit(1); | |
137 | } | |
138 | sin.sin_port = htons((u_short)sin.sin_port); | |
139 | } | |
31004941 GM |
140 | } else { |
141 | sp = getservbyname("telnet", "tcp"); | |
142 | if (sp == 0) { | |
143 | fprintf(stderr, | |
144 | "telnetd: tcp/telnet: unknown service\n"); | |
ea139302 | 145 | exit(1); |
31004941 GM |
146 | } |
147 | sin.sin_port = sp->s_port; | |
5d78ef73 GM |
148 | } |
149 | ||
150 | s = socket(AF_INET, SOCK_STREAM, 0); | |
151 | if (s < 0) { | |
152 | perror("telnetd: socket");; | |
153 | exit(1); | |
154 | } | |
ea139302 PB |
155 | (void) setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
156 | if (bind(s, (struct sockaddr *)&sin, sizeof sin) < 0) { | |
5d78ef73 GM |
157 | perror("bind"); |
158 | exit(1); | |
159 | } | |
160 | if (listen(s, 1) < 0) { | |
161 | perror("listen"); | |
162 | exit(1); | |
163 | } | |
164 | foo = sizeof sin; | |
ea139302 | 165 | ns = accept(s, (struct sockaddr *)&sin, &foo); |
5d78ef73 GM |
166 | if (ns < 0) { |
167 | perror("accept"); | |
168 | exit(1); | |
169 | } | |
ea139302 PB |
170 | (void) dup2(ns, 0); |
171 | (void) close(ns); | |
172 | (void) close(s); | |
5d78ef73 | 173 | } |
ea139302 | 174 | |
076ae92c | 175 | openlog("telnetd", LOG_PID | LOG_ODELAY, LOG_DAEMON); |
bb933cc2 | 176 | fromlen = sizeof (from); |
ea139302 PB |
177 | if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0) { |
178 | fprintf(stderr, "%s: ", progname); | |
bb933cc2 MK |
179 | perror("getpeername"); |
180 | _exit(1); | |
de3b21e8 | 181 | } |
bcb894cb | 182 | if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof (on)) < 0) { |
3f99c0f7 | 183 | syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); |
de3b21e8 | 184 | } |
ea139302 PB |
185 | net = 0; |
186 | doit(&from); | |
187 | /* NOTREACHED */ | |
188 | } /* end of main */ | |
f553aca8 | 189 | |
d8b5e42c | 190 | int cleanup(); |
affdaa4e | 191 | |
d8b5e42c GM |
192 | /* |
193 | * getterminaltype | |
affdaa4e | 194 | * |
ea139302 | 195 | * Ask the other end to send along its terminal type and speed. |
d8b5e42c | 196 | * Output is the variable terminaltype filled in. |
affdaa4e | 197 | */ |
ea139302 | 198 | static char ttytype_sbbuf[] = { IAC, SB, TELOPT_TTYPE, TELQUAL_SEND, IAC, SE }; |
d8b5e42c GM |
199 | void |
200 | getterminaltype() | |
affdaa4e | 201 | { |
ea139302 | 202 | void ttloop(); |
affdaa4e | 203 | |
ea139302 PB |
204 | settimer(baseline); |
205 | willoption(TELOPT_TTYPE, 1); | |
206 | willoption(TELOPT_TSPEED, 1); | |
207 | while ((hiswants[TELOPT_TTYPE] != hisopts[TELOPT_TTYPE]) || | |
208 | (hiswants[TELOPT_TSPEED] != hisopts[TELOPT_TSPEED])) { | |
d8b5e42c | 209 | ttloop(); |
affdaa4e | 210 | } |
ea139302 PB |
211 | if (hisopts[TELOPT_TSPEED] == OPT_YES) { |
212 | static char sbbuf[] = { IAC, SB, TELOPT_TSPEED, TELQUAL_SEND, IAC, SE }; | |
affdaa4e | 213 | |
d8b5e42c GM |
214 | bcopy(sbbuf, nfrontp, sizeof sbbuf); |
215 | nfrontp += sizeof sbbuf; | |
ea139302 PB |
216 | } |
217 | if (hisopts[TELOPT_TTYPE] == OPT_YES) { | |
218 | ||
219 | bcopy(ttytype_sbbuf, nfrontp, sizeof ttytype_sbbuf); | |
220 | nfrontp += sizeof ttytype_sbbuf; | |
221 | } | |
222 | if (hisopts[TELOPT_TSPEED] == OPT_YES) { | |
223 | while (sequenceIs(tspeedsubopt, baseline)) | |
224 | ttloop(); | |
225 | } | |
226 | if (hisopts[TELOPT_TTYPE] == OPT_YES) { | |
227 | char first[256], last[256]; | |
228 | ||
229 | while (sequenceIs(ttypesubopt, baseline)) | |
d8b5e42c | 230 | ttloop(); |
ea139302 PB |
231 | |
232 | if (!terminaltypeok(&terminaltype[5])) { | |
233 | (void) strncpy(first, terminaltype, sizeof(first)); | |
234 | for(;;) { | |
235 | /* | |
236 | * Save the unknown name, and request the next name. | |
237 | */ | |
238 | (void) strncpy(last, terminaltype, sizeof(last)); | |
239 | _gettermname(); | |
240 | if (terminaltypeok(&terminaltype[5])) | |
241 | break; | |
242 | if (strncmp(last, terminaltype, sizeof(last)) == 0) { | |
243 | /* | |
244 | * We've hit the end. If this is the same as | |
245 | * the first name, just go with it. | |
246 | */ | |
247 | if (strncmp(first, terminaltype, sizeof(first) == 0)) | |
248 | break; | |
249 | /* | |
250 | * Get the terminal name one more type, so that | |
251 | * RFC1091 compliant telnets will cycle back to | |
252 | * the start of the list. | |
253 | */ | |
254 | _gettermname(); | |
255 | if (strncmp(first, terminaltype, sizeof(first) != 0)) | |
256 | (void) strncpy(terminaltype, first, sizeof(first)); | |
257 | break; | |
258 | } | |
259 | } | |
d8b5e42c GM |
260 | } |
261 | } | |
ea139302 PB |
262 | } /* end of getterminaltype */ |
263 | ||
264 | _gettermname() | |
265 | { | |
266 | settimer(baseline); | |
267 | bcopy(ttytype_sbbuf, nfrontp, sizeof ttytype_sbbuf); | |
268 | nfrontp += sizeof ttytype_sbbuf; | |
269 | while (sequenceIs(ttypesubopt, baseline)) | |
270 | ttloop(); | |
271 | } | |
272 | ||
273 | terminaltypeok(s) | |
274 | char *s; | |
275 | { | |
276 | char buf[1024]; | |
277 | ||
278 | if (terminaltype == NULL) | |
279 | return(1); | |
280 | ||
281 | /* | |
282 | * tgetent() will return 1 if the type is known, and | |
283 | * 0 if it is not known. If it returns -1, it couldn't | |
284 | * open the database. But if we can't open the database, | |
285 | * it won't help to say we failed, because we won't be | |
286 | * able to verify anything else. So, we treat -1 like 1. | |
287 | */ | |
288 | if (tgetent(buf, s) == 0) | |
289 | return(0); | |
290 | return(1); | |
d8b5e42c | 291 | } |
66b878f6 BJ |
292 | |
293 | /* | |
294 | * Get a pty, scan input lines. | |
295 | */ | |
ea139302 | 296 | doit(who) |
37c640e2 | 297 | struct sockaddr_in *who; |
66b878f6 | 298 | { |
c29f876c | 299 | char *host, *inet_ntoa(); |
ea139302 | 300 | int t; |
37c640e2 | 301 | struct hostent *hp; |
1a33b848 | 302 | |
ea139302 PB |
303 | /* |
304 | * Find an available pty to use. | |
305 | */ | |
306 | pty = getpty(); | |
307 | if (pty < 0) | |
308 | fatal(net, "All network ports in use"); | |
c29f876c | 309 | |
ea139302 PB |
310 | t = getptyslave(); |
311 | ||
312 | /* get name of connected client */ | |
313 | hp = gethostbyaddr((char *)&who->sin_addr, sizeof (struct in_addr), | |
37c640e2 SL |
314 | who->sin_family); |
315 | if (hp) | |
316 | host = hp->h_name; | |
317 | else | |
05fa5465 | 318 | host = inet_ntoa(who->sin_addr); |
d8b5e42c | 319 | |
d8b5e42c | 320 | /* |
ea139302 | 321 | * get terminal type. |
d8b5e42c GM |
322 | */ |
323 | getterminaltype(); | |
ea139302 PB |
324 | if (terminaltype == NULL) |
325 | terminaltype = "TERM=network"; | |
d8b5e42c | 326 | |
affdaa4e | 327 | /* |
ea139302 | 328 | * Start up the login process on the slave side of the terminal |
affdaa4e | 329 | */ |
ea139302 | 330 | startslave(t, host); |
5d78ef73 | 331 | |
ea139302 PB |
332 | telnet(net, pty); /* begin server processing */ |
333 | /*NOTREACHED*/ | |
334 | } /* end of doit */ | |
5d78ef73 | 335 | |
ea139302 PB |
336 | #ifndef MAXHOSTNAMELEN |
337 | #define MAXHOSTNAMELEN 64 | |
338 | #endif MAXHOSTNAMELEN | |
66b878f6 BJ |
339 | /* |
340 | * Main loop. Select from pty and network, and | |
341 | * hand data to telnet receiver finite state machine. | |
342 | */ | |
343 | telnet(f, p) | |
ea139302 | 344 | int f, p; |
66b878f6 BJ |
345 | { |
346 | int on = 1; | |
5eddff6d | 347 | char hostname[MAXHOSTNAMELEN]; |
ea139302 PB |
348 | #ifdef CRAY2 |
349 | int termstat(); | |
350 | int interrupt(), sendbrk(); | |
351 | #endif | |
d0a64c71 GM |
352 | #define TABBUFSIZ 512 |
353 | char defent[TABBUFSIZ]; | |
354 | char defstrs[TABBUFSIZ]; | |
355 | #undef TABBUFSIZ | |
356 | char *HE; | |
357 | char *HN; | |
358 | char *IM; | |
ea139302 PB |
359 | void netflush(); |
360 | ||
9eebc521 | 361 | /* |
ea139302 | 362 | * Initialize the slc mapping table. |
9eebc521 | 363 | */ |
ea139302 | 364 | get_slc_defaults(); |
66b878f6 | 365 | |
da96b661 | 366 | /* |
ea139302 PB |
367 | * Do some tests where it is desireable to wait for a response. |
368 | * Rather than doing them slowly, one at a time, do them all | |
369 | * at once. | |
da96b661 | 370 | */ |
ea139302 PB |
371 | if (!myopts[TELOPT_SGA]) |
372 | dooption(TELOPT_SGA); | |
affdaa4e GM |
373 | /* |
374 | * Is the client side a 4.2 (NOT 4.3) system? We need to know this | |
375 | * because 4.2 clients are unable to deal with TCP urgent data. | |
376 | * | |
377 | * To find out, we send out a "DO ECHO". If the remote system | |
378 | * answers "WILL ECHO" it is probably a 4.2 client, and we note | |
379 | * that fact ("WILL ECHO" ==> that the client will echo what | |
380 | * WE, the server, sends it; it does NOT mean that the client will | |
381 | * echo the terminal input). | |
382 | */ | |
ea139302 PB |
383 | willoption(TELOPT_ECHO, 1); |
384 | ||
385 | #ifdef LINEMODE | |
386 | if (hisopts[TELOPT_LINEMODE] == OPT_NO) { | |
387 | /* Query the peer for linemode support by trying to negotiate | |
388 | * the linemode option. | |
389 | */ | |
390 | linemode = 1; | |
391 | editmode = 0; | |
392 | willoption(TELOPT_LINEMODE, 1); /* send do linemode */ | |
393 | } | |
394 | #endif /* LINEMODE */ | |
395 | ||
396 | /* | |
397 | * Send along a couple of other options that we wish to negotiate. | |
398 | */ | |
399 | willoption(TELOPT_NAWS, 1); | |
400 | dooption(TELOPT_STATUS, 1); | |
401 | flowmode = 1; /* default flow control state */ | |
402 | willoption(TELOPT_LFLOW, 1); | |
403 | ||
404 | /* | |
405 | * Spin, waiting for a response from the DO ECHO. However, | |
406 | * some REALLY DUMB telnets out there might not respond | |
407 | * to the DO ECHO. So, we spin looking for NAWS, (most dumb | |
408 | * telnets so far seem to respond with WONT for a DO that | |
409 | * they don't understand...) because by the time we get the | |
410 | * response, it will already have processed the DO ECHO. | |
411 | * Kludge upon kludge. | |
412 | */ | |
413 | while (hiswants[TELOPT_NAWS] != hisopts[TELOPT_NAWS]) | |
414 | ttloop(); | |
415 | ||
86b6dfea PB |
416 | /* |
417 | * On the off chance that the telnet client is broken and does not | |
418 | * respond to the DO ECHO we sent, (after all, we did send the | |
419 | * DO NAWS negotiation after the DO ECHO, and we won't get here | |
420 | * until a response to the DO NAWS comes back) simulate the | |
421 | * receipt of a will echo. This will also send a WONT ECHO | |
422 | * to the client, since we assume that the client failed to | |
423 | * respond because it believes that it is already in DO ECHO | |
424 | * mode, which we do not want. | |
425 | */ | |
426 | if (hiswants[TELOPT_ECHO] == OPT_YES) | |
427 | willoption(TELOPT_ECHO, 0); | |
428 | ||
429 | /* | |
430 | * Finally, to clean things up, we turn on our echo. This | |
431 | * will break stupid 4.2 telnets out of local terminal echo. | |
432 | */ | |
433 | ||
434 | if (!myopts[TELOPT_ECHO]) | |
435 | dooption(TELOPT_ECHO); | |
436 | ||
ea139302 PB |
437 | /* |
438 | * Turn on packet mode, and default to line at at time mode. | |
439 | */ | |
440 | (void) ioctl(p, TIOCPKT, (char *)&on); | |
441 | #ifdef LINEMODE | |
442 | tty_setlinemode(1); | |
443 | ||
444 | # ifdef KLUDGELINEMODE | |
445 | /* | |
446 | * Continuing line mode support. If client does not support | |
447 | * real linemode, attempt to negotiate kludge linemode by sending | |
448 | * the do timing mark sequence. | |
449 | */ | |
450 | if (lmodetype < REAL_LINEMODE) | |
451 | willoption(TELOPT_TM, 1); | |
452 | # endif /* KLUDGELINEMODE */ | |
453 | #endif /* LINEMODE */ | |
454 | ||
455 | /* | |
456 | * Call telrcv() once to pick up anything received during | |
457 | * terminal type negotiation, 4.2/4.3 determination, and | |
458 | * linemode negotiation. | |
459 | */ | |
460 | telrcv(); | |
461 | ||
462 | (void) ioctl(f, FIONBIO, (char *)&on); | |
463 | (void) ioctl(p, FIONBIO, (char *)&on); | |
464 | #ifdef CRAY2 | |
465 | init_termdriver(f, p, interrupt, sendbrk); | |
466 | #endif | |
467 | ||
468 | #if defined(SO_OOBINLINE) | |
469 | (void) setsockopt(net, SOL_SOCKET, SO_OOBINLINE, &on, sizeof on); | |
470 | #endif /* defined(SO_OOBINLINE) */ | |
471 | ||
472 | #ifdef SIGTSTP | |
473 | (void) signal(SIGTSTP, SIG_IGN); | |
474 | #endif | |
475 | #ifdef SIGTTOU | |
476 | /* | |
477 | * Ignoring SIGTTOU keeps the kernel from blocking us | |
478 | * in ttioct() in /sys/tty.c. | |
479 | */ | |
480 | (void) signal(SIGTTOU, SIG_IGN); | |
481 | #endif | |
482 | ||
483 | (void) signal(SIGCHLD, cleanup); | |
484 | ||
485 | #if defined(CRAY2) | |
486 | /* | |
487 | * Cray-2 will send a signal when pty modes are changed by slave | |
488 | * side. Set up signal handler now. | |
489 | */ | |
490 | if ((int)signal(SIGUSR1, termstat) < 0) | |
491 | perror("signal"); | |
492 | else if (ioctl(p, TCSIGME, (char *)SIGUSR1) < 0) | |
493 | perror("ioctl:TCSIGME"); | |
494 | /* | |
495 | * Make processing loop check terminal characteristics early on. | |
496 | */ | |
497 | termstat(); | |
498 | #endif | |
499 | ||
500 | (void) setpgrp(0, 0); | |
affdaa4e | 501 | |
0c285f22 SL |
502 | /* |
503 | * Show banner that getty never gave. | |
10dc182f | 504 | * |
d0a64c71 GM |
505 | * We put the banner in the pty input buffer. This way, it |
506 | * gets carriage return null processing, etc., just like all | |
507 | * other pty --> client data. | |
0c285f22 | 508 | */ |
10dc182f | 509 | |
ea139302 PB |
510 | (void) gethostname(hostname, sizeof (hostname)); |
511 | ||
d0a64c71 GM |
512 | if (getent(defent, "default") == 1) { |
513 | char *getstr(); | |
ea139302 | 514 | char *cp=defstrs; |
d0a64c71 | 515 | |
ea139302 PB |
516 | HE = getstr("he", &cp); |
517 | HN = getstr("hn", &cp); | |
518 | IM = getstr("im", &cp); | |
d0a64c71 | 519 | if (HN && *HN) |
ea139302 PB |
520 | (void) strcpy(hostname, HN); |
521 | if (IM == 0) | |
522 | IM = ""; | |
d0a64c71 | 523 | } else { |
ea139302 PB |
524 | #ifdef CRAY |
525 | if (hostinfo == 0) | |
526 | IM = 0; | |
527 | else | |
528 | #endif | |
529 | IM = DEFAULT_IM; | |
530 | HE = 0; | |
531 | } | |
532 | edithost(HE, hostname); | |
533 | if (IM && *IM) | |
534 | putf(IM, ptyibuf2); | |
535 | ||
536 | if (pcc) | |
537 | (void) strncat(ptyibuf2, ptyip, pcc+1); | |
538 | ptyip = ptyibuf2; | |
539 | pcc = strlen(ptyip); | |
affdaa4e | 540 | |
66b878f6 | 541 | for (;;) { |
5d78ef73 | 542 | fd_set ibits, obits, xbits; |
66b878f6 BJ |
543 | register int c; |
544 | ||
5d78ef73 GM |
545 | if (ncc < 0 && pcc < 0) |
546 | break; | |
547 | ||
ea139302 PB |
548 | #ifdef CRAY2 |
549 | if (needtermstat) | |
550 | _termstat(); | |
551 | #endif /* CRAY2 */ | |
5d78ef73 GM |
552 | FD_ZERO(&ibits); |
553 | FD_ZERO(&obits); | |
554 | FD_ZERO(&xbits); | |
66b878f6 BJ |
555 | /* |
556 | * Never look for input if there's still | |
557 | * stuff in the corresponding output buffer | |
558 | */ | |
5d78ef73 GM |
559 | if (nfrontp - nbackp || pcc > 0) { |
560 | FD_SET(f, &obits); | |
561 | } else { | |
562 | FD_SET(p, &ibits); | |
563 | } | |
564 | if (pfrontp - pbackp || ncc > 0) { | |
565 | FD_SET(p, &obits); | |
566 | } else { | |
567 | FD_SET(f, &ibits); | |
568 | } | |
569 | if (!SYNCHing) { | |
570 | FD_SET(f, &xbits); | |
571 | } | |
572 | if ((c = select(16, &ibits, &obits, &xbits, | |
573 | (struct timeval *)0)) < 1) { | |
574 | if (c == -1) { | |
575 | if (errno == EINTR) { | |
576 | continue; | |
577 | } | |
578 | } | |
66b878f6 BJ |
579 | sleep(5); |
580 | continue; | |
581 | } | |
582 | ||
5d78ef73 GM |
583 | /* |
584 | * Any urgent data? | |
585 | */ | |
586 | if (FD_ISSET(net, &xbits)) { | |
587 | SYNCHing = 1; | |
588 | } | |
589 | ||
66b878f6 BJ |
590 | /* |
591 | * Something to read from the network... | |
592 | */ | |
5d78ef73 | 593 | if (FD_ISSET(net, &ibits)) { |
affdaa4e | 594 | #if !defined(SO_OOBINLINE) |
5d78ef73 | 595 | /* |
5eddff6d | 596 | * In 4.2 (and 4.3 beta) systems, the |
5d78ef73 GM |
597 | * OOB indication and data handling in the kernel |
598 | * is such that if two separate TCP Urgent requests | |
599 | * come in, one byte of TCP data will be overlaid. | |
600 | * This is fatal for Telnet, but we try to live | |
601 | * with it. | |
602 | * | |
603 | * In addition, in 4.2 (and...), a special protocol | |
604 | * is needed to pick up the TCP Urgent data in | |
605 | * the correct sequence. | |
606 | * | |
607 | * What we do is: if we think we are in urgent | |
608 | * mode, we look to see if we are "at the mark". | |
609 | * If we are, we do an OOB receive. If we run | |
610 | * this twice, we will do the OOB receive twice, | |
611 | * but the second will fail, since the second | |
612 | * time we were "at the mark", but there wasn't | |
613 | * any data there (the kernel doesn't reset | |
614 | * "at the mark" until we do a normal read). | |
615 | * Once we've read the OOB data, we go ahead | |
616 | * and do normal reads. | |
617 | * | |
618 | * There is also another problem, which is that | |
619 | * since the OOB byte we read doesn't put us | |
620 | * out of OOB state, and since that byte is most | |
621 | * likely the TELNET DM (data mark), we would | |
622 | * stay in the TELNET SYNCH (SYNCHing) state. | |
623 | * So, clocks to the rescue. If we've "just" | |
624 | * received a DM, then we test for the | |
625 | * presence of OOB data when the receive OOB | |
626 | * fails (and AFTER we did the normal mode read | |
627 | * to clear "at the mark"). | |
628 | */ | |
629 | if (SYNCHing) { | |
630 | int atmark; | |
631 | ||
ea139302 | 632 | (void) ioctl(net, SIOCATMARK, (char *)&atmark); |
5d78ef73 GM |
633 | if (atmark) { |
634 | ncc = recv(net, netibuf, sizeof (netibuf), MSG_OOB); | |
635 | if ((ncc == -1) && (errno == EINVAL)) { | |
636 | ncc = read(net, netibuf, sizeof (netibuf)); | |
d8b5e42c | 637 | if (sequenceIs(didnetreceive, gotDM)) { |
5d78ef73 GM |
638 | SYNCHing = stilloob(net); |
639 | } | |
640 | } | |
641 | } else { | |
642 | ncc = read(net, netibuf, sizeof (netibuf)); | |
66b878f6 | 643 | } |
5d78ef73 GM |
644 | } else { |
645 | ncc = read(net, netibuf, sizeof (netibuf)); | |
646 | } | |
647 | settimer(didnetreceive); | |
affdaa4e | 648 | #else /* !defined(SO_OOBINLINE)) */ |
5d78ef73 | 649 | ncc = read(net, netibuf, sizeof (netibuf)); |
affdaa4e | 650 | #endif /* !defined(SO_OOBINLINE)) */ |
5d78ef73 GM |
651 | if (ncc < 0 && errno == EWOULDBLOCK) |
652 | ncc = 0; | |
653 | else { | |
654 | if (ncc <= 0) { | |
655 | break; | |
656 | } | |
657 | netip = netibuf; | |
658 | } | |
66b878f6 BJ |
659 | } |
660 | ||
661 | /* | |
662 | * Something to read from the pty... | |
663 | */ | |
ea139302 | 664 | if (FD_ISSET(p, &ibits)) { |
66b878f6 BJ |
665 | pcc = read(p, ptyibuf, BUFSIZ); |
666 | if (pcc < 0 && errno == EWOULDBLOCK) | |
667 | pcc = 0; | |
668 | else { | |
669 | if (pcc <= 0) | |
670 | break; | |
ea139302 PB |
671 | #ifndef CRAY2 |
672 | #ifdef LINEMODE | |
673 | /* | |
674 | * If ioctl from pty, pass it through net | |
675 | */ | |
676 | if (ptyibuf[0] & TIOCPKT_IOCTL) { | |
677 | copy_termbuf(ptyibuf+1, pcc-1); | |
678 | localstat(); | |
679 | pcc = 1; | |
680 | } | |
681 | #endif LINEMODE | |
31004941 | 682 | if (ptyibuf[0] & TIOCPKT_FLUSHWRITE) { |
ea139302 | 683 | netclear(); /* clear buffer back */ |
31004941 GM |
684 | *nfrontp++ = IAC; |
685 | *nfrontp++ = DM; | |
686 | neturg = nfrontp-1; /* off by one XXX */ | |
687 | } | |
688 | if (hisopts[TELOPT_LFLOW] && | |
689 | (ptyibuf[0] & | |
ea139302 PB |
690 | (TIOCPKT_NOSTOP|TIOCPKT_DOSTOP))) { |
691 | (void) sprintf(nfrontp, "%c%c%c%c%c%c", | |
31004941 GM |
692 | IAC, SB, TELOPT_LFLOW, |
693 | ptyibuf[0] & TIOCPKT_DOSTOP ? 1 : 0, | |
694 | IAC, SE); | |
695 | nfrontp += 6; | |
696 | } | |
4701a1c1 GM |
697 | pcc--; |
698 | ptyip = ptyibuf+1; | |
ea139302 PB |
699 | #else /* CRAY2 */ |
700 | if (!uselinemode) { | |
701 | pcc = term_output(ptyibuf, ptyibuf2, | |
702 | pcc, BUFSIZ); | |
703 | ptyip = ptyibuf2; | |
704 | } else | |
705 | ptyip = ptyibuf; | |
706 | #endif /* CRAY2 */ | |
707 | } | |
4701a1c1 | 708 | } |
66b878f6 BJ |
709 | |
710 | while (pcc > 0) { | |
711 | if ((&netobuf[BUFSIZ] - nfrontp) < 2) | |
712 | break; | |
713 | c = *ptyip++ & 0377, pcc--; | |
714 | if (c == IAC) | |
715 | *nfrontp++ = c; | |
ea139302 PB |
716 | #ifdef CRAY2 |
717 | else if (c == '\n' && | |
718 | myopts[TELOPT_BINARY] == OPT_NO && newmap) | |
719 | *nfrontp++ = '\r'; | |
720 | #endif /* CRAY2 */ | |
66b878f6 | 721 | *nfrontp++ = c; |
bdb993e7 | 722 | if ((c == '\r') && (myopts[TELOPT_BINARY] == OPT_NO)) { |
9f515693 GM |
723 | if (pcc > 0 && ((*ptyip & 0377) == '\n')) { |
724 | *nfrontp++ = *ptyip++ & 0377; | |
725 | pcc--; | |
726 | } else | |
727 | *nfrontp++ = '\0'; | |
728 | } | |
66b878f6 | 729 | } |
5d78ef73 | 730 | if (FD_ISSET(f, &obits) && (nfrontp - nbackp) > 0) |
66b878f6 BJ |
731 | netflush(); |
732 | if (ncc > 0) | |
733 | telrcv(); | |
5d78ef73 | 734 | if (FD_ISSET(p, &obits) && (pfrontp - pbackp) > 0) |
66b878f6 BJ |
735 | ptyflush(); |
736 | } | |
737 | cleanup(); | |
ea139302 | 738 | } /* end of telnet */ |
66b878f6 | 739 | |
ea139302 PB |
740 | #ifndef TCSIG |
741 | # ifdef TIOCSIG | |
742 | # define TCSIG TIOCSIG | |
743 | # endif | |
744 | #endif | |
66b878f6 BJ |
745 | |
746 | /* | |
747 | * Send interrupt to process on other side of pty. | |
748 | * If it is in raw mode, just write NULL; | |
749 | * otherwise, write intr char. | |
750 | */ | |
751 | interrupt() | |
752 | { | |
66b878f6 | 753 | ptyflush(); /* half-hearted */ |
ea139302 PB |
754 | |
755 | #ifdef TCSIG | |
756 | (void) ioctl(pty, TCSIG, (char *)SIGINT); | |
757 | #else /* TCSIG */ | |
758 | init_termbuf(); | |
759 | *pfrontp++ = slctab[SLC_IP].sptr ? *slctab[SLC_IP].sptr : '\177'; | |
760 | #endif /* TCSIG */ | |
66b878f6 BJ |
761 | } |
762 | ||
a65453b7 GM |
763 | /* |
764 | * Send quit to process on other side of pty. | |
765 | * If it is in raw mode, just write NULL; | |
766 | * otherwise, write quit char. | |
767 | */ | |
768 | sendbrk() | |
769 | { | |
a65453b7 | 770 | ptyflush(); /* half-hearted */ |
ea139302 PB |
771 | #ifdef TCSIG |
772 | (void) ioctl(pty, TCSIG, (char *)SIGQUIT); | |
773 | #else /* TCSIG */ | |
774 | init_termbuf(); | |
775 | *pfrontp++ = slctab[SLC_ABORT].sptr ? *slctab[SLC_ABORT].sptr : '\034'; | |
776 | #endif /* TCSIG */ | |
615dc3cd | 777 | } |
5d78ef73 | 778 | |
ea139302 | 779 | sendsusp() |
5d78ef73 | 780 | { |
ea139302 PB |
781 | #ifdef SIGTSTP |
782 | ptyflush(); /* half-hearted */ | |
783 | # ifdef TCSIG | |
784 | (void) ioctl(pty, TCSIG, (char *)SIGTSTP); | |
785 | # else /* TCSIG */ | |
786 | *pfrontp++ = slctab[SLC_SUSP].sptr ? *slctab[SLC_SUSP].sptr : '\032'; | |
787 | # endif /* TCSIG */ | |
788 | #endif /* SIGTSTP */ | |
d0a64c71 GM |
789 | } |
790 | ||
ea139302 | 791 | doeof() |
d0a64c71 | 792 | { |
ea139302 | 793 | init_termbuf(); |
d0a64c71 | 794 | |
ea139302 | 795 | *pfrontp++ = slctab[SLC_EOF].sptr ? *slctab[SLC_EOF].sptr : '\004'; |
d0a64c71 | 796 | } |