Commit | Line | Data |
---|---|---|
8c5eec2f | 1 | /* |
5eddff6d | 2 | * Copyright (c) 1983,1986 Regents of the University of California. |
8c5eec2f DF |
3 | * All rights reserved. The Berkeley software License Agreement |
4 | * specifies the terms and conditions for redistribution. | |
5 | */ | |
6 | ||
7 | #ifndef lint | |
8 | char copyright[] = | |
9 | "@(#) Copyright (c) 1983 Regents of the University of California.\n\ | |
10 | All rights reserved.\n"; | |
11 | #endif not lint | |
12 | ||
ac6e6727 | 13 | #ifndef lint |
10a3b37e | 14 | static char sccsid[] = "@(#)telnetd.c 5.18 (Berkeley) %G%"; |
8c5eec2f | 15 | #endif not lint |
ac6e6727 | 16 | |
66b878f6 | 17 | /* |
5eddff6d | 18 | * Telnet server. |
66b878f6 | 19 | */ |
5eddff6d | 20 | #include <sys/param.h> |
de3b21e8 | 21 | #include <sys/socket.h> |
ce4fd43b | 22 | #include <sys/wait.h> |
1a33b848 | 23 | #include <sys/file.h> |
c29f876c | 24 | #include <sys/stat.h> |
5d78ef73 | 25 | #include <sys/time.h> |
de3b21e8 SL |
26 | |
27 | #include <netinet/in.h> | |
28 | ||
2b597a6b SL |
29 | #include <arpa/telnet.h> |
30 | ||
66b878f6 BJ |
31 | #include <stdio.h> |
32 | #include <signal.h> | |
33 | #include <errno.h> | |
34 | #include <sgtty.h> | |
9f005877 | 35 | #include <netdb.h> |
3f99c0f7 | 36 | #include <syslog.h> |
affdaa4e | 37 | #include <ctype.h> |
de3b21e8 | 38 | |
d8b5e42c GM |
39 | #define OPT_NO 0 /* won't do this option */ |
40 | #define OPT_YES 1 /* will do this option */ | |
41 | #define OPT_YES_BUT_ALWAYS_LOOK 2 | |
42 | #define OPT_NO_BUT_ALWAYS_LOOK 3 | |
66b878f6 BJ |
43 | char hisopts[256]; |
44 | char myopts[256]; | |
45 | ||
46 | char doopt[] = { IAC, DO, '%', 'c', 0 }; | |
47 | char dont[] = { IAC, DONT, '%', 'c', 0 }; | |
48 | char will[] = { IAC, WILL, '%', 'c', 0 }; | |
49 | char wont[] = { IAC, WONT, '%', 'c', 0 }; | |
50 | ||
51 | /* | |
52 | * I/O data buffers, pointers, and counters. | |
53 | */ | |
54 | char ptyibuf[BUFSIZ], *ptyip = ptyibuf; | |
affdaa4e | 55 | |
66b878f6 | 56 | char ptyobuf[BUFSIZ], *pfrontp = ptyobuf, *pbackp = ptyobuf; |
affdaa4e | 57 | |
66b878f6 | 58 | char netibuf[BUFSIZ], *netip = netibuf; |
affdaa4e GM |
59 | #define NIACCUM(c) { *netip++ = c; \ |
60 | ncc++; \ | |
61 | } | |
62 | ||
9ef3087d | 63 | char netobuf[BUFSIZ], *nfrontp = netobuf, *nbackp = netobuf; |
5d78ef73 | 64 | char *neturg = 0; /* one past last bye of urgent data */ |
affdaa4e GM |
65 | /* the remote system seems to NOT be an old 4.2 */ |
66 | int not42 = 1; | |
67 | ||
68 | ||
10dc182f GM |
69 | char BANNER1[] = "\r\n\r\n4.3 BSD UNIX (", |
70 | BANNER2[] = ")\r\n\r\0\r\n\r\0"; | |
71 | ||
d8b5e42c GM |
72 | /* buffer for sub-options */ |
73 | char subbuffer[100], *subpointer= subbuffer, *subend= subbuffer; | |
affdaa4e | 74 | #define SB_CLEAR() subpointer = subbuffer; |
d8b5e42c | 75 | #define SB_TERM() { subend = subpointer; SB_CLEAR(); } |
affdaa4e GM |
76 | #define SB_ACCUM(c) if (subpointer < (subbuffer+sizeof subbuffer)) { \ |
77 | *subpointer++ = (c); \ | |
78 | } | |
d8b5e42c GM |
79 | #define SB_GET() ((*subpointer++)&0xff) |
80 | #define SB_EOF() (subpointer >= subend) | |
affdaa4e | 81 | |
66b878f6 BJ |
82 | int pcc, ncc; |
83 | ||
84 | int pty, net; | |
85 | int inter; | |
fe5c5547 | 86 | extern char **environ; |
66b878f6 | 87 | extern int errno; |
c29f876c | 88 | char *line; |
5d78ef73 GM |
89 | int SYNCHing = 0; /* we are in TELNET SYNCH mode */ |
90 | /* | |
91 | * The following are some clocks used to decide how to interpret | |
92 | * the relationship between various variables. | |
93 | */ | |
66b878f6 | 94 | |
5d78ef73 GM |
95 | struct { |
96 | int | |
97 | system, /* what the current time is */ | |
98 | echotoggle, /* last time user entered echo character */ | |
99 | modenegotiated, /* last time operating mode negotiated */ | |
100 | didnetreceive, /* last time we read data from network */ | |
d8b5e42c GM |
101 | ttypeopt, /* ttype will/won't received */ |
102 | ttypesubopt, /* ttype subopt is received */ | |
103 | getterminal, /* time started to get terminal information */ | |
5d78ef73 GM |
104 | gotDM; /* when did we last see a data mark */ |
105 | } clocks; | |
106 | ||
d8b5e42c GM |
107 | #define settimer(x) (clocks.x = ++clocks.system) |
108 | #define sequenceIs(x,y) (clocks.x < clocks.y) | |
5d78ef73 | 109 | \f |
66b878f6 BJ |
110 | main(argc, argv) |
111 | char *argv[]; | |
112 | { | |
bb933cc2 | 113 | struct sockaddr_in from; |
bcb894cb | 114 | int on = 1, fromlen; |
bb933cc2 | 115 | |
5d78ef73 GM |
116 | #if defined(DEBUG) |
117 | { | |
118 | int s, ns, foo; | |
119 | struct servent *sp; | |
120 | static struct sockaddr_in sin = { AF_INET }; | |
121 | ||
122 | sp = getservbyname("telnet", "tcp"); | |
123 | if (sp == 0) { | |
124 | fprintf(stderr, "telnetd: tcp/telnet: unknown service\n"); | |
125 | exit(1); | |
126 | } | |
127 | sin.sin_port = sp->s_port; | |
128 | argc--, argv++; | |
129 | if (argc > 0) { | |
130 | sin.sin_port = atoi(*argv); | |
131 | sin.sin_port = htons((u_short)sin.sin_port); | |
132 | } | |
133 | ||
134 | s = socket(AF_INET, SOCK_STREAM, 0); | |
135 | if (s < 0) { | |
136 | perror("telnetd: socket");; | |
137 | exit(1); | |
138 | } | |
139 | if (bind(s, &sin, sizeof sin) < 0) { | |
140 | perror("bind"); | |
141 | exit(1); | |
142 | } | |
143 | if (listen(s, 1) < 0) { | |
144 | perror("listen"); | |
145 | exit(1); | |
146 | } | |
147 | foo = sizeof sin; | |
148 | ns = accept(s, &sin, &foo); | |
149 | if (ns < 0) { | |
150 | perror("accept"); | |
151 | exit(1); | |
152 | } | |
153 | dup2(ns, 0); | |
154 | close(s); | |
155 | } | |
156 | #endif /* defined(DEBUG) */ | |
076ae92c | 157 | openlog("telnetd", LOG_PID | LOG_ODELAY, LOG_DAEMON); |
bb933cc2 MK |
158 | fromlen = sizeof (from); |
159 | if (getpeername(0, &from, &fromlen) < 0) { | |
160 | fprintf(stderr, "%s: ", argv[0]); | |
161 | perror("getpeername"); | |
162 | _exit(1); | |
de3b21e8 | 163 | } |
bcb894cb | 164 | if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof (on)) < 0) { |
3f99c0f7 | 165 | syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); |
de3b21e8 | 166 | } |
bb933cc2 | 167 | doit(0, &from); |
f553aca8 SL |
168 | } |
169 | ||
d8b5e42c GM |
170 | char *terminaltype = 0; |
171 | char *envinit[2]; | |
172 | int cleanup(); | |
affdaa4e GM |
173 | |
174 | /* | |
d8b5e42c | 175 | * ttloop |
affdaa4e | 176 | * |
d8b5e42c GM |
177 | * A small subroutine to flush the network output buffer, get some data |
178 | * from the network, and pass it through the telnet state machine. We | |
179 | * also flush the pty input buffer (by dropping its data) if it becomes | |
180 | * too full. | |
181 | */ | |
182 | ||
183 | void | |
184 | ttloop() | |
185 | { | |
186 | if (nfrontp-nbackp) { | |
187 | netflush(); | |
188 | } | |
189 | ncc = read(net, netibuf, sizeof netibuf); | |
190 | if (ncc < 0) { | |
191 | syslog(LOG_INFO, "ttloop: read: %m\n"); | |
10a3b37e GM |
192 | exit(1); |
193 | } else if (ncc == 0) { | |
194 | syslog(LOG_INFO, "ttloop: peer died: %m\n"); | |
195 | exit(1); | |
d8b5e42c GM |
196 | } |
197 | netip = netibuf; | |
198 | telrcv(); /* state machine */ | |
199 | if (ncc > 0) { | |
200 | pfrontp = pbackp = ptyobuf; | |
201 | telrcv(); | |
202 | } | |
203 | } | |
204 | ||
205 | /* | |
206 | * getterminaltype | |
affdaa4e | 207 | * |
d8b5e42c GM |
208 | * Ask the other end to send along its terminal type. |
209 | * Output is the variable terminaltype filled in. | |
affdaa4e GM |
210 | */ |
211 | ||
d8b5e42c GM |
212 | void |
213 | getterminaltype() | |
affdaa4e | 214 | { |
d8b5e42c | 215 | static char sbuf[] = { IAC, DO, TELOPT_TTYPE }; |
affdaa4e | 216 | |
d8b5e42c GM |
217 | settimer(getterminal); |
218 | bcopy(sbuf, nfrontp, sizeof sbuf); | |
219 | nfrontp += sizeof sbuf; | |
10a3b37e | 220 | hisopts[TELOPT_TTYPE] = OPT_YES_BUT_ALWAYS_LOOK; |
d8b5e42c GM |
221 | while (sequenceIs(ttypeopt, getterminal)) { |
222 | ttloop(); | |
affdaa4e | 223 | } |
d8b5e42c GM |
224 | if (hisopts[TELOPT_TTYPE] == OPT_YES) { |
225 | static char sbbuf[] = { IAC, SB, TELOPT_TTYPE, TELQUAL_SEND, IAC, SE }; | |
affdaa4e | 226 | |
d8b5e42c GM |
227 | bcopy(sbbuf, nfrontp, sizeof sbbuf); |
228 | nfrontp += sizeof sbbuf; | |
229 | while (sequenceIs(ttypesubopt, getterminal)) { | |
230 | ttloop(); | |
231 | } | |
232 | } | |
233 | } | |
66b878f6 BJ |
234 | |
235 | /* | |
236 | * Get a pty, scan input lines. | |
237 | */ | |
37c640e2 SL |
238 | doit(f, who) |
239 | int f; | |
240 | struct sockaddr_in *who; | |
66b878f6 | 241 | { |
c29f876c | 242 | char *host, *inet_ntoa(); |
1a33b848 | 243 | int i, p, t; |
66b878f6 | 244 | struct sgttyb b; |
37c640e2 | 245 | struct hostent *hp; |
affdaa4e | 246 | int c; |
1a33b848 | 247 | |
c29f876c MK |
248 | for (c = 'p'; c <= 's'; c++) { |
249 | struct stat stb; | |
250 | ||
251 | line = "/dev/ptyXX"; | |
252 | line[strlen("/dev/pty")] = c; | |
253 | line[strlen("/dev/ptyp")] = '0'; | |
254 | if (stat(line, &stb) < 0) | |
255 | break; | |
1a33b848 | 256 | for (i = 0; i < 16; i++) { |
c29f876c MK |
257 | line[strlen("/dev/ptyp")] = "0123456789abcdef"[i]; |
258 | p = open(line, 2); | |
1a33b848 SL |
259 | if (p > 0) |
260 | goto gotpty; | |
261 | } | |
66b878f6 | 262 | } |
8f2758db SL |
263 | fatal(f, "All network ports in use"); |
264 | /*NOTREACHED*/ | |
66b878f6 BJ |
265 | gotpty: |
266 | dup2(f, 0); | |
c29f876c | 267 | line[strlen("/dev/")] = 't'; |
1a33b848 | 268 | t = open("/dev/tty", O_RDWR); |
66b878f6 BJ |
269 | if (t >= 0) { |
270 | ioctl(t, TIOCNOTTY, 0); | |
271 | close(t); | |
272 | } | |
c29f876c | 273 | t = open(line, O_RDWR); |
8f2758db | 274 | if (t < 0) |
c29f876c | 275 | fatalperror(f, line, errno); |
66b878f6 | 276 | ioctl(t, TIOCGETP, &b); |
9ef3087d | 277 | b.sg_flags = CRMOD|XTABS|ANYP; |
66b878f6 | 278 | ioctl(t, TIOCSETP, &b); |
9ef3087d | 279 | ioctl(p, TIOCGETP, &b); |
da96b661 | 280 | b.sg_flags &= ~ECHO; |
9ef3087d | 281 | ioctl(p, TIOCSETP, &b); |
37c640e2 SL |
282 | hp = gethostbyaddr(&who->sin_addr, sizeof (struct in_addr), |
283 | who->sin_family); | |
284 | if (hp) | |
285 | host = hp->h_name; | |
286 | else | |
05fa5465 | 287 | host = inet_ntoa(who->sin_addr); |
d8b5e42c GM |
288 | |
289 | net = f; | |
290 | pty = p; | |
291 | ||
292 | /* | |
293 | * get terminal type. | |
294 | */ | |
295 | getterminaltype(); | |
296 | ||
8f2758db SL |
297 | if ((i = fork()) < 0) |
298 | fatalperror(f, "fork", errno); | |
66b878f6 BJ |
299 | if (i) |
300 | telnet(f, p); | |
301 | close(f); | |
302 | close(p); | |
303 | dup2(t, 0); | |
304 | dup2(t, 1); | |
305 | dup2(t, 2); | |
306 | close(t); | |
d8b5e42c GM |
307 | envinit[0] = terminaltype; |
308 | envinit[1] = 0; | |
fe5c5547 | 309 | environ = envinit; |
affdaa4e GM |
310 | /* |
311 | * -h : pass on name of host. | |
d8b5e42c GM |
312 | * WARNING: -h is accepted by login if and only if |
313 | * getuid() == 0. | |
affdaa4e GM |
314 | * -p : don't clobber the environment (so terminal type stays set). |
315 | */ | |
316 | execl("/bin/login", "login", "-h", host, | |
d8b5e42c | 317 | terminaltype ? "-p" : 0, 0); |
8f2758db SL |
318 | fatalperror(f, "/bin/login", errno); |
319 | /*NOTREACHED*/ | |
320 | } | |
321 | ||
322 | fatal(f, msg) | |
323 | int f; | |
324 | char *msg; | |
325 | { | |
326 | char buf[BUFSIZ]; | |
327 | ||
1a33b848 | 328 | (void) sprintf(buf, "telnetd: %s.\r\n", msg); |
8f2758db | 329 | (void) write(f, buf, strlen(buf)); |
66b878f6 BJ |
330 | exit(1); |
331 | } | |
332 | ||
8f2758db SL |
333 | fatalperror(f, msg, errno) |
334 | int f; | |
335 | char *msg; | |
336 | int errno; | |
337 | { | |
338 | char buf[BUFSIZ]; | |
339 | extern char *sys_errlist[]; | |
340 | ||
1a33b848 | 341 | (void) sprintf(buf, "%s: %s\r\n", msg, sys_errlist[errno]); |
8f2758db SL |
342 | fatal(f, buf); |
343 | } | |
344 | ||
5d78ef73 GM |
345 | |
346 | /* | |
347 | * Check a descriptor to see if out of band data exists on it. | |
348 | */ | |
349 | ||
350 | ||
351 | stilloob(s) | |
352 | int s; /* socket number */ | |
353 | { | |
354 | static struct timeval timeout = { 0 }; | |
355 | fd_set excepts; | |
356 | int value; | |
357 | ||
358 | do { | |
359 | FD_ZERO(&excepts); | |
360 | FD_SET(s, &excepts); | |
361 | value = select(s+1, (fd_set *)0, (fd_set *)0, &excepts, &timeout); | |
5eddff6d | 362 | } while ((value == -1) && (errno == EINTR)); |
5d78ef73 GM |
363 | |
364 | if (value < 0) { | |
365 | fatalperror(pty, "select", errno); | |
366 | } | |
367 | if (FD_ISSET(s, &excepts)) { | |
368 | return 1; | |
369 | } else { | |
370 | return 0; | |
371 | } | |
372 | } | |
373 | \f | |
66b878f6 BJ |
374 | /* |
375 | * Main loop. Select from pty and network, and | |
376 | * hand data to telnet receiver finite state machine. | |
377 | */ | |
378 | telnet(f, p) | |
379 | { | |
380 | int on = 1; | |
5eddff6d | 381 | char hostname[MAXHOSTNAMELEN]; |
66b878f6 | 382 | |
66b878f6 BJ |
383 | ioctl(f, FIONBIO, &on); |
384 | ioctl(p, FIONBIO, &on); | |
affdaa4e GM |
385 | #if defined(SO_OOBINLINE) |
386 | setsockopt(net, SOL_SOCKET, SO_OOBINLINE, &on, sizeof on); | |
387 | #endif /* defined(SO_OOBINLINE) */ | |
66b878f6 | 388 | signal(SIGTSTP, SIG_IGN); |
8a53982e | 389 | signal(SIGCHLD, cleanup); |
f4c5d9f9 | 390 | setpgrp(0, 0); |
66b878f6 | 391 | |
da96b661 | 392 | /* |
5d78ef73 | 393 | * Request to do remote echo and to suppress go ahead. |
da96b661 | 394 | */ |
d8b5e42c GM |
395 | if (!myopts[TELOPT_ECHO]) { |
396 | dooption(TELOPT_ECHO); | |
397 | } | |
398 | if (!myopts[TELOPT_SGA]) { | |
399 | dooption(TELOPT_SGA); | |
400 | } | |
affdaa4e GM |
401 | /* |
402 | * Is the client side a 4.2 (NOT 4.3) system? We need to know this | |
403 | * because 4.2 clients are unable to deal with TCP urgent data. | |
404 | * | |
405 | * To find out, we send out a "DO ECHO". If the remote system | |
406 | * answers "WILL ECHO" it is probably a 4.2 client, and we note | |
407 | * that fact ("WILL ECHO" ==> that the client will echo what | |
408 | * WE, the server, sends it; it does NOT mean that the client will | |
409 | * echo the terminal input). | |
410 | */ | |
411 | sprintf(nfrontp, doopt, TELOPT_ECHO); | |
412 | nfrontp += sizeof doopt-2; | |
d8b5e42c | 413 | hisopts[TELOPT_ECHO] = OPT_YES_BUT_ALWAYS_LOOK; |
affdaa4e | 414 | |
0c285f22 SL |
415 | /* |
416 | * Show banner that getty never gave. | |
10dc182f GM |
417 | * |
418 | * The banner includes some null's (for TELNET CR disambiguation), | |
419 | * so we have to be somewhat complicated. | |
0c285f22 | 420 | */ |
10dc182f | 421 | |
0c285f22 | 422 | gethostname(hostname, sizeof (hostname)); |
10dc182f GM |
423 | |
424 | bcopy(BANNER1, nfrontp, sizeof BANNER1 -1); | |
425 | nfrontp += sizeof BANNER1 - 1; | |
426 | bcopy(hostname, nfrontp, strlen(hostname)); | |
427 | nfrontp += strlen(hostname); | |
428 | bcopy(BANNER2, nfrontp, sizeof BANNER2 -1); | |
429 | nfrontp += sizeof BANNER2 - 1; | |
affdaa4e GM |
430 | |
431 | /* | |
432 | * Call telrcv() once to pick up anything received during | |
433 | * terminal type negotiation. | |
434 | */ | |
435 | telrcv(); | |
436 | ||
66b878f6 | 437 | for (;;) { |
5d78ef73 | 438 | fd_set ibits, obits, xbits; |
66b878f6 BJ |
439 | register int c; |
440 | ||
5d78ef73 GM |
441 | if (ncc < 0 && pcc < 0) |
442 | break; | |
443 | ||
444 | FD_ZERO(&ibits); | |
445 | FD_ZERO(&obits); | |
446 | FD_ZERO(&xbits); | |
66b878f6 BJ |
447 | /* |
448 | * Never look for input if there's still | |
449 | * stuff in the corresponding output buffer | |
450 | */ | |
5d78ef73 GM |
451 | if (nfrontp - nbackp || pcc > 0) { |
452 | FD_SET(f, &obits); | |
453 | } else { | |
454 | FD_SET(p, &ibits); | |
455 | } | |
456 | if (pfrontp - pbackp || ncc > 0) { | |
457 | FD_SET(p, &obits); | |
458 | } else { | |
459 | FD_SET(f, &ibits); | |
460 | } | |
461 | if (!SYNCHing) { | |
462 | FD_SET(f, &xbits); | |
463 | } | |
464 | if ((c = select(16, &ibits, &obits, &xbits, | |
465 | (struct timeval *)0)) < 1) { | |
466 | if (c == -1) { | |
467 | if (errno == EINTR) { | |
468 | continue; | |
469 | } | |
470 | } | |
66b878f6 BJ |
471 | sleep(5); |
472 | continue; | |
473 | } | |
474 | ||
5d78ef73 GM |
475 | /* |
476 | * Any urgent data? | |
477 | */ | |
478 | if (FD_ISSET(net, &xbits)) { | |
479 | SYNCHing = 1; | |
480 | } | |
481 | ||
66b878f6 BJ |
482 | /* |
483 | * Something to read from the network... | |
484 | */ | |
5d78ef73 | 485 | if (FD_ISSET(net, &ibits)) { |
affdaa4e | 486 | #if !defined(SO_OOBINLINE) |
5d78ef73 | 487 | /* |
5eddff6d | 488 | * In 4.2 (and 4.3 beta) systems, the |
5d78ef73 GM |
489 | * OOB indication and data handling in the kernel |
490 | * is such that if two separate TCP Urgent requests | |
491 | * come in, one byte of TCP data will be overlaid. | |
492 | * This is fatal for Telnet, but we try to live | |
493 | * with it. | |
494 | * | |
495 | * In addition, in 4.2 (and...), a special protocol | |
496 | * is needed to pick up the TCP Urgent data in | |
497 | * the correct sequence. | |
498 | * | |
499 | * What we do is: if we think we are in urgent | |
500 | * mode, we look to see if we are "at the mark". | |
501 | * If we are, we do an OOB receive. If we run | |
502 | * this twice, we will do the OOB receive twice, | |
503 | * but the second will fail, since the second | |
504 | * time we were "at the mark", but there wasn't | |
505 | * any data there (the kernel doesn't reset | |
506 | * "at the mark" until we do a normal read). | |
507 | * Once we've read the OOB data, we go ahead | |
508 | * and do normal reads. | |
509 | * | |
510 | * There is also another problem, which is that | |
511 | * since the OOB byte we read doesn't put us | |
512 | * out of OOB state, and since that byte is most | |
513 | * likely the TELNET DM (data mark), we would | |
514 | * stay in the TELNET SYNCH (SYNCHing) state. | |
515 | * So, clocks to the rescue. If we've "just" | |
516 | * received a DM, then we test for the | |
517 | * presence of OOB data when the receive OOB | |
518 | * fails (and AFTER we did the normal mode read | |
519 | * to clear "at the mark"). | |
520 | */ | |
521 | if (SYNCHing) { | |
522 | int atmark; | |
523 | ||
524 | ioctl(net, SIOCATMARK, (char *)&atmark); | |
525 | if (atmark) { | |
526 | ncc = recv(net, netibuf, sizeof (netibuf), MSG_OOB); | |
527 | if ((ncc == -1) && (errno == EINVAL)) { | |
528 | ncc = read(net, netibuf, sizeof (netibuf)); | |
d8b5e42c | 529 | if (sequenceIs(didnetreceive, gotDM)) { |
5d78ef73 GM |
530 | SYNCHing = stilloob(net); |
531 | } | |
532 | } | |
533 | } else { | |
534 | ncc = read(net, netibuf, sizeof (netibuf)); | |
66b878f6 | 535 | } |
5d78ef73 GM |
536 | } else { |
537 | ncc = read(net, netibuf, sizeof (netibuf)); | |
538 | } | |
539 | settimer(didnetreceive); | |
affdaa4e | 540 | #else /* !defined(SO_OOBINLINE)) */ |
5d78ef73 | 541 | ncc = read(net, netibuf, sizeof (netibuf)); |
affdaa4e | 542 | #endif /* !defined(SO_OOBINLINE)) */ |
5d78ef73 GM |
543 | if (ncc < 0 && errno == EWOULDBLOCK) |
544 | ncc = 0; | |
545 | else { | |
546 | if (ncc <= 0) { | |
547 | break; | |
548 | } | |
549 | netip = netibuf; | |
550 | } | |
66b878f6 BJ |
551 | } |
552 | ||
553 | /* | |
554 | * Something to read from the pty... | |
555 | */ | |
5d78ef73 | 556 | if (FD_ISSET(p, &ibits)) { |
66b878f6 BJ |
557 | pcc = read(p, ptyibuf, BUFSIZ); |
558 | if (pcc < 0 && errno == EWOULDBLOCK) | |
559 | pcc = 0; | |
560 | else { | |
561 | if (pcc <= 0) | |
562 | break; | |
563 | ptyip = ptyibuf; | |
564 | } | |
565 | } | |
566 | ||
567 | while (pcc > 0) { | |
568 | if ((&netobuf[BUFSIZ] - nfrontp) < 2) | |
569 | break; | |
570 | c = *ptyip++ & 0377, pcc--; | |
571 | if (c == IAC) | |
572 | *nfrontp++ = c; | |
573 | *nfrontp++ = c; | |
9f515693 GM |
574 | if (c == '\r') { |
575 | if (pcc > 0 && ((*ptyip & 0377) == '\n')) { | |
576 | *nfrontp++ = *ptyip++ & 0377; | |
577 | pcc--; | |
578 | } else | |
579 | *nfrontp++ = '\0'; | |
580 | } | |
66b878f6 | 581 | } |
5d78ef73 | 582 | if (FD_ISSET(f, &obits) && (nfrontp - nbackp) > 0) |
66b878f6 BJ |
583 | netflush(); |
584 | if (ncc > 0) | |
585 | telrcv(); | |
5d78ef73 | 586 | if (FD_ISSET(p, &obits) && (pfrontp - pbackp) > 0) |
66b878f6 BJ |
587 | ptyflush(); |
588 | } | |
589 | cleanup(); | |
590 | } | |
591 | ||
592 | /* | |
593 | * State for recv fsm | |
594 | */ | |
595 | #define TS_DATA 0 /* base state */ | |
596 | #define TS_IAC 1 /* look for double IAC's */ | |
597 | #define TS_CR 2 /* CR-LF ->'s CR */ | |
affdaa4e GM |
598 | #define TS_SB 3 /* throw away begin's... */ |
599 | #define TS_SE 4 /* ...end's (suboption negotiation) */ | |
66b878f6 BJ |
600 | #define TS_WILL 5 /* will option negotiation */ |
601 | #define TS_WONT 6 /* wont " */ | |
602 | #define TS_DO 7 /* do " */ | |
603 | #define TS_DONT 8 /* dont " */ | |
604 | ||
605 | telrcv() | |
606 | { | |
607 | register int c; | |
608 | static int state = TS_DATA; | |
66b878f6 BJ |
609 | |
610 | while (ncc > 0) { | |
611 | if ((&ptyobuf[BUFSIZ] - pfrontp) < 2) | |
612 | return; | |
613 | c = *netip++ & 0377, ncc--; | |
614 | switch (state) { | |
615 | ||
8356bfad GM |
616 | case TS_CR: |
617 | state = TS_DATA; | |
a6d8450f | 618 | if ((c == 0) || (c == '\n')) { |
8356bfad | 619 | break; |
a6d8450f | 620 | } |
8356bfad GM |
621 | /* FALL THROUGH */ |
622 | ||
66b878f6 BJ |
623 | case TS_DATA: |
624 | if (c == IAC) { | |
625 | state = TS_IAC; | |
626 | break; | |
627 | } | |
628 | if (inter > 0) | |
629 | break; | |
9f515693 GM |
630 | /* |
631 | * We map \r\n ==> \n, since \r\n says | |
632 | * that we want to be in column 1 of the next | |
633 | * printable line, and \n is the standard | |
634 | * unix way of saying that (\r is only good | |
635 | * if CRMOD is set, which it normally is). | |
636 | */ | |
d8b5e42c | 637 | if ((myopts[TELOPT_BINARY] == OPT_NO) && c == '\r') { |
9f515693 GM |
638 | if ((ncc > 0) && ('\n' == *netip)) { |
639 | netip++; ncc--; | |
640 | c = '\n'; | |
641 | } else { | |
642 | state = TS_CR; | |
643 | } | |
a6d8450f GM |
644 | } |
645 | *pfrontp++ = c; | |
66b878f6 BJ |
646 | break; |
647 | ||
648 | case TS_IAC: | |
649 | switch (c) { | |
650 | ||
651 | /* | |
652 | * Send the process on the pty side an | |
653 | * interrupt. Do this with a NULL or | |
654 | * interrupt char; depending on the tty mode. | |
655 | */ | |
66b878f6 BJ |
656 | case IP: |
657 | interrupt(); | |
658 | break; | |
659 | ||
a65453b7 GM |
660 | case BREAK: |
661 | sendbrk(); | |
662 | break; | |
663 | ||
66b878f6 BJ |
664 | /* |
665 | * Are You There? | |
666 | */ | |
667 | case AYT: | |
1a33b848 SL |
668 | strcpy(nfrontp, "\r\n[Yes]\r\n"); |
669 | nfrontp += 9; | |
66b878f6 BJ |
670 | break; |
671 | ||
5d78ef73 GM |
672 | /* |
673 | * Abort Output | |
674 | */ | |
675 | case AO: { | |
676 | struct ltchars tmpltc; | |
677 | ||
678 | ptyflush(); /* half-hearted */ | |
679 | ioctl(pty, TIOCGLTC, &tmpltc); | |
680 | if (tmpltc.t_flushc != '\377') { | |
681 | *pfrontp++ = tmpltc.t_flushc; | |
682 | } | |
615dc3cd | 683 | netclear(); /* clear buffer back */ |
5d78ef73 GM |
684 | *nfrontp++ = IAC; |
685 | *nfrontp++ = DM; | |
c77c3bec | 686 | neturg = nfrontp-1; /* off by one XXX */ |
5d78ef73 GM |
687 | break; |
688 | } | |
689 | ||
66b878f6 BJ |
690 | /* |
691 | * Erase Character and | |
692 | * Erase Line | |
693 | */ | |
694 | case EC: | |
5d78ef73 GM |
695 | case EL: { |
696 | struct sgttyb b; | |
697 | char ch; | |
698 | ||
699 | ptyflush(); /* half-hearted */ | |
700 | ioctl(pty, TIOCGETP, &b); | |
701 | ch = (c == EC) ? | |
702 | b.sg_erase : b.sg_kill; | |
703 | if (ch != '\377') { | |
704 | *pfrontp++ = ch; | |
705 | } | |
706 | break; | |
707 | } | |
66b878f6 BJ |
708 | |
709 | /* | |
710 | * Check for urgent data... | |
711 | */ | |
712 | case DM: | |
5d78ef73 GM |
713 | SYNCHing = stilloob(net); |
714 | settimer(gotDM); | |
66b878f6 BJ |
715 | break; |
716 | ||
5d78ef73 | 717 | |
66b878f6 BJ |
718 | /* |
719 | * Begin option subnegotiation... | |
720 | */ | |
721 | case SB: | |
affdaa4e | 722 | state = TS_SB; |
66b878f6 BJ |
723 | continue; |
724 | ||
725 | case WILL: | |
0e376915 GM |
726 | state = TS_WILL; |
727 | continue; | |
728 | ||
66b878f6 | 729 | case WONT: |
0e376915 GM |
730 | state = TS_WONT; |
731 | continue; | |
732 | ||
66b878f6 | 733 | case DO: |
0e376915 GM |
734 | state = TS_DO; |
735 | continue; | |
736 | ||
66b878f6 | 737 | case DONT: |
0e376915 | 738 | state = TS_DONT; |
66b878f6 BJ |
739 | continue; |
740 | ||
741 | case IAC: | |
742 | *pfrontp++ = c; | |
743 | break; | |
744 | } | |
745 | state = TS_DATA; | |
746 | break; | |
747 | ||
affdaa4e GM |
748 | case TS_SB: |
749 | if (c == IAC) { | |
750 | state = TS_SE; | |
751 | } else { | |
752 | SB_ACCUM(c); | |
753 | } | |
66b878f6 BJ |
754 | break; |
755 | ||
affdaa4e GM |
756 | case TS_SE: |
757 | if (c != SE) { | |
758 | if (c != IAC) { | |
759 | SB_ACCUM(IAC); | |
760 | } | |
761 | SB_ACCUM(c); | |
762 | state = TS_SB; | |
763 | } else { | |
764 | SB_TERM(); | |
765 | suboption(); /* handle sub-option */ | |
766 | state = TS_DATA; | |
767 | } | |
66b878f6 BJ |
768 | break; |
769 | ||
770 | case TS_WILL: | |
d8b5e42c | 771 | if (hisopts[c] != OPT_YES) |
66b878f6 BJ |
772 | willoption(c); |
773 | state = TS_DATA; | |
774 | continue; | |
775 | ||
776 | case TS_WONT: | |
d8b5e42c | 777 | if (hisopts[c] != OPT_NO) |
66b878f6 BJ |
778 | wontoption(c); |
779 | state = TS_DATA; | |
780 | continue; | |
781 | ||
782 | case TS_DO: | |
d8b5e42c | 783 | if (myopts[c] != OPT_YES) |
66b878f6 BJ |
784 | dooption(c); |
785 | state = TS_DATA; | |
786 | continue; | |
787 | ||
788 | case TS_DONT: | |
d8b5e42c | 789 | if (myopts[c] != OPT_NO) { |
affdaa4e | 790 | dontoption(c); |
66b878f6 BJ |
791 | } |
792 | state = TS_DATA; | |
793 | continue; | |
794 | ||
795 | default: | |
5eddff6d | 796 | syslog(LOG_ERR, "telnetd: panic state=%d\n", state); |
de3b21e8 | 797 | printf("telnetd: panic state=%d\n", state); |
66b878f6 BJ |
798 | exit(1); |
799 | } | |
800 | } | |
801 | } | |
802 | ||
803 | willoption(option) | |
804 | int option; | |
805 | { | |
806 | char *fmt; | |
807 | ||
808 | switch (option) { | |
809 | ||
810 | case TELOPT_BINARY: | |
811 | mode(RAW, 0); | |
0e376915 GM |
812 | fmt = doopt; |
813 | break; | |
66b878f6 BJ |
814 | |
815 | case TELOPT_ECHO: | |
affdaa4e GM |
816 | not42 = 0; /* looks like a 4.2 system */ |
817 | /* | |
818 | * Now, in a 4.2 system, to break them out of ECHOing | |
819 | * (to the terminal) mode, we need to send a "WILL ECHO". | |
820 | * Kludge upon kludge! | |
821 | */ | |
d8b5e42c | 822 | if (myopts[TELOPT_ECHO] == OPT_YES) { |
affdaa4e GM |
823 | dooption(TELOPT_ECHO); |
824 | } | |
825 | fmt = dont; | |
0e376915 | 826 | break; |
66b878f6 | 827 | |
affdaa4e | 828 | case TELOPT_TTYPE: |
d8b5e42c GM |
829 | settimer(ttypeopt); |
830 | if (hisopts[TELOPT_TTYPE] == OPT_YES_BUT_ALWAYS_LOOK) { | |
831 | hisopts[TELOPT_TTYPE] = OPT_YES; | |
832 | return; | |
833 | } | |
834 | fmt = doopt; | |
835 | break; | |
836 | ||
66b878f6 | 837 | case TELOPT_SGA: |
66b878f6 BJ |
838 | fmt = doopt; |
839 | break; | |
840 | ||
841 | case TELOPT_TM: | |
842 | fmt = dont; | |
843 | break; | |
844 | ||
845 | default: | |
846 | fmt = dont; | |
847 | break; | |
848 | } | |
0e376915 | 849 | if (fmt == doopt) { |
d8b5e42c | 850 | hisopts[option] = OPT_YES; |
0e376915 | 851 | } else { |
d8b5e42c | 852 | hisopts[option] = OPT_NO; |
0e376915 | 853 | } |
13646f15 | 854 | sprintf(nfrontp, fmt, option); |
da96b661 | 855 | nfrontp += sizeof (dont) - 2; |
66b878f6 BJ |
856 | } |
857 | ||
858 | wontoption(option) | |
859 | int option; | |
860 | { | |
861 | char *fmt; | |
862 | ||
863 | switch (option) { | |
66b878f6 | 864 | case TELOPT_ECHO: |
affdaa4e | 865 | not42 = 1; /* doesn't seem to be a 4.2 system */ |
0e376915 | 866 | break; |
66b878f6 BJ |
867 | |
868 | case TELOPT_BINARY: | |
869 | mode(0, RAW); | |
66b878f6 | 870 | break; |
10a3b37e GM |
871 | |
872 | case TELOPT_TTYPE: | |
873 | settimer(ttypeopt); | |
874 | break; | |
66b878f6 | 875 | } |
10a3b37e | 876 | |
0e376915 | 877 | fmt = dont; |
d8b5e42c | 878 | hisopts[option] = OPT_NO; |
66b878f6 | 879 | sprintf(nfrontp, fmt, option); |
da96b661 | 880 | nfrontp += sizeof (doopt) - 2; |
66b878f6 BJ |
881 | } |
882 | ||
883 | dooption(option) | |
884 | int option; | |
885 | { | |
886 | char *fmt; | |
887 | ||
888 | switch (option) { | |
889 | ||
890 | case TELOPT_TM: | |
891 | fmt = wont; | |
892 | break; | |
893 | ||
894 | case TELOPT_ECHO: | |
895 | mode(ECHO|CRMOD, 0); | |
0e376915 GM |
896 | fmt = will; |
897 | break; | |
66b878f6 BJ |
898 | |
899 | case TELOPT_BINARY: | |
900 | mode(RAW, 0); | |
0e376915 GM |
901 | fmt = will; |
902 | break; | |
66b878f6 BJ |
903 | |
904 | case TELOPT_SGA: | |
66b878f6 BJ |
905 | fmt = will; |
906 | break; | |
907 | ||
908 | default: | |
909 | fmt = wont; | |
910 | break; | |
911 | } | |
0e376915 | 912 | if (fmt == will) { |
d8b5e42c | 913 | myopts[option] = OPT_YES; |
0e376915 | 914 | } else { |
d8b5e42c | 915 | myopts[option] = OPT_NO; |
0e376915 | 916 | } |
66b878f6 | 917 | sprintf(nfrontp, fmt, option); |
da96b661 | 918 | nfrontp += sizeof (doopt) - 2; |
66b878f6 BJ |
919 | } |
920 | ||
affdaa4e GM |
921 | |
922 | dontoption(option) | |
923 | int option; | |
924 | { | |
925 | char *fmt; | |
926 | ||
927 | switch (option) { | |
928 | case TELOPT_ECHO: /* we should stop echoing */ | |
929 | mode(0, ECHO|CRMOD); | |
930 | fmt = wont; | |
931 | break; | |
d8b5e42c | 932 | |
affdaa4e GM |
933 | default: |
934 | fmt = wont; | |
935 | break; | |
936 | } | |
d8b5e42c | 937 | |
affdaa4e | 938 | if (fmt = wont) { |
d8b5e42c | 939 | myopts[option] = OPT_NO; |
affdaa4e | 940 | } else { |
d8b5e42c | 941 | myopts[option] = OPT_YES; |
affdaa4e GM |
942 | } |
943 | sprintf(nfrontp, fmt, option); | |
944 | nfrontp += sizeof (wont) - 2; | |
945 | } | |
946 | ||
947 | /* | |
948 | * suboption() | |
949 | * | |
950 | * Look at the sub-option buffer, and try to be helpful to the other | |
951 | * side. | |
952 | * | |
953 | * Currently we recognize: | |
954 | * | |
d8b5e42c | 955 | * Terminal type is |
affdaa4e GM |
956 | */ |
957 | ||
958 | suboption() | |
959 | { | |
d8b5e42c GM |
960 | switch (SB_GET()) { |
961 | case TELOPT_TTYPE: { /* Yaaaay! */ | |
962 | static char terminalname[5+41] = "TERM="; | |
963 | ||
964 | settimer(ttypesubopt); | |
965 | ||
966 | if (SB_GET() != TELQUAL_IS) { | |
967 | return; /* ??? XXX but, this is the most robust */ | |
968 | } | |
969 | ||
970 | terminaltype = terminalname+strlen(terminalname); | |
971 | ||
972 | while ((terminaltype < (terminalname + sizeof terminalname-1)) && | |
973 | !SB_EOF()) { | |
974 | register int c; | |
975 | ||
976 | c = SB_GET(); | |
977 | if (isupper(c)) { | |
978 | c = tolower(c); | |
979 | } | |
980 | *terminaltype++ = c; /* accumulate name */ | |
981 | } | |
982 | *terminaltype = 0; | |
983 | terminaltype = terminalname; | |
984 | break; | |
985 | } | |
986 | ||
affdaa4e GM |
987 | default: |
988 | ; | |
989 | } | |
990 | } | |
991 | ||
66b878f6 BJ |
992 | mode(on, off) |
993 | int on, off; | |
994 | { | |
995 | struct sgttyb b; | |
996 | ||
997 | ptyflush(); | |
998 | ioctl(pty, TIOCGETP, &b); | |
999 | b.sg_flags |= on; | |
1000 | b.sg_flags &= ~off; | |
1001 | ioctl(pty, TIOCSETP, &b); | |
1002 | } | |
1003 | ||
1004 | /* | |
1005 | * Send interrupt to process on other side of pty. | |
1006 | * If it is in raw mode, just write NULL; | |
1007 | * otherwise, write intr char. | |
1008 | */ | |
1009 | interrupt() | |
1010 | { | |
1011 | struct sgttyb b; | |
1012 | struct tchars tchars; | |
1013 | ||
1014 | ptyflush(); /* half-hearted */ | |
1015 | ioctl(pty, TIOCGETP, &b); | |
1016 | if (b.sg_flags & RAW) { | |
1017 | *pfrontp++ = '\0'; | |
1018 | return; | |
1019 | } | |
1020 | *pfrontp++ = ioctl(pty, TIOCGETC, &tchars) < 0 ? | |
1021 | '\177' : tchars.t_intrc; | |
1022 | } | |
1023 | ||
a65453b7 GM |
1024 | /* |
1025 | * Send quit to process on other side of pty. | |
1026 | * If it is in raw mode, just write NULL; | |
1027 | * otherwise, write quit char. | |
1028 | */ | |
1029 | sendbrk() | |
1030 | { | |
1031 | struct sgttyb b; | |
1032 | struct tchars tchars; | |
1033 | ||
1034 | ptyflush(); /* half-hearted */ | |
1035 | ioctl(pty, TIOCGETP, &b); | |
1036 | if (b.sg_flags & RAW) { | |
1037 | *pfrontp++ = '\0'; | |
1038 | return; | |
1039 | } | |
1040 | *pfrontp++ = ioctl(pty, TIOCGETC, &tchars) < 0 ? | |
1041 | '\034' : tchars.t_quitc; | |
1042 | } | |
1043 | ||
66b878f6 BJ |
1044 | ptyflush() |
1045 | { | |
1046 | int n; | |
1047 | ||
1048 | if ((n = pfrontp - pbackp) > 0) | |
1049 | n = write(pty, pbackp, n); | |
9f005877 SL |
1050 | if (n < 0) |
1051 | return; | |
66b878f6 BJ |
1052 | pbackp += n; |
1053 | if (pbackp == pfrontp) | |
1054 | pbackp = pfrontp = ptyobuf; | |
1055 | } | |
615dc3cd GM |
1056 | \f |
1057 | /* | |
1058 | * nextitem() | |
1059 | * | |
1060 | * Return the address of the next "item" in the TELNET data | |
1061 | * stream. This will be the address of the next character if | |
1062 | * the current address is a user data character, or it will | |
1063 | * be the address of the character following the TELNET command | |
1064 | * if the current address is a TELNET IAC ("I Am a Command") | |
1065 | * character. | |
1066 | */ | |
66b878f6 | 1067 | |
615dc3cd GM |
1068 | char * |
1069 | nextitem(current) | |
1070 | char *current; | |
66b878f6 | 1071 | { |
615dc3cd GM |
1072 | if ((*current&0xff) != IAC) { |
1073 | return current+1; | |
1074 | } | |
1075 | switch (*(current+1)&0xff) { | |
1076 | case DO: | |
1077 | case DONT: | |
1078 | case WILL: | |
1079 | case WONT: | |
1080 | return current+3; | |
1081 | case SB: /* loop forever looking for the SE */ | |
1082 | { | |
1083 | register char *look = current+2; | |
66b878f6 | 1084 | |
615dc3cd GM |
1085 | for (;;) { |
1086 | if ((*look++&0xff) == IAC) { | |
1087 | if ((*look++&0xff) == SE) { | |
1088 | return look; | |
1089 | } | |
1090 | } | |
1091 | } | |
9f005877 | 1092 | } |
615dc3cd GM |
1093 | default: |
1094 | return current+2; | |
1095 | } | |
66b878f6 | 1096 | } |
5d78ef73 GM |
1097 | |
1098 | ||
615dc3cd GM |
1099 | /* |
1100 | * netclear() | |
1101 | * | |
1102 | * We are about to do a TELNET SYNCH operation. Clear | |
1103 | * the path to the network. | |
1104 | * | |
1105 | * Things are a bit tricky since we may have sent the first | |
1106 | * byte or so of a previous TELNET command into the network. | |
1107 | * So, we have to scan the network buffer from the beginning | |
1108 | * until we are up to where we want to be. | |
1109 | * | |
1110 | * A side effect of what we do, just to keep things | |
1111 | * simple, is to clear the urgent data pointer. The principal | |
1112 | * caller should be setting the urgent data pointer AFTER calling | |
1113 | * us in any case. | |
1114 | */ | |
1115 | ||
1116 | netclear() | |
1117 | { | |
1118 | register char *thisitem, *next; | |
1119 | char *good; | |
1120 | #define wewant(p) ((nfrontp > p) && ((*p&0xff) == IAC) && \ | |
1121 | ((*(p+1)&0xff) != EC) && ((*(p+1)&0xff) != EL)) | |
1122 | ||
1123 | thisitem = netobuf; | |
1124 | ||
1125 | while ((next = nextitem(thisitem)) <= nbackp) { | |
1126 | thisitem = next; | |
1127 | } | |
1128 | ||
1129 | /* Now, thisitem is first before/at boundary. */ | |
1130 | ||
1131 | good = netobuf; /* where the good bytes go */ | |
1132 | ||
1133 | while (nfrontp > thisitem) { | |
1134 | if (wewant(thisitem)) { | |
1135 | int length; | |
1136 | ||
1137 | next = thisitem; | |
1138 | do { | |
1139 | next = nextitem(next); | |
1140 | } while (wewant(next) && (nfrontp > next)); | |
1141 | length = next-thisitem; | |
1142 | bcopy(thisitem, good, length); | |
1143 | good += length; | |
1144 | thisitem = next; | |
1145 | } else { | |
1146 | thisitem = nextitem(thisitem); | |
1147 | } | |
1148 | } | |
1149 | ||
1150 | nbackp = netobuf; | |
1151 | nfrontp = good; /* next byte to be sent */ | |
1152 | neturg = 0; | |
1153 | } | |
1154 | \f | |
5d78ef73 GM |
1155 | /* |
1156 | * netflush | |
1157 | * Send as much data as possible to the network, | |
1158 | * handling requests for urgent data. | |
1159 | */ | |
1160 | ||
1161 | ||
1162 | netflush() | |
1163 | { | |
1164 | int n; | |
1165 | ||
1166 | if ((n = nfrontp - nbackp) > 0) { | |
affdaa4e GM |
1167 | /* |
1168 | * if no urgent data, or if the other side appears to be an | |
1169 | * old 4.2 client (and thus unable to survive TCP urgent data), | |
1170 | * write the entire buffer in non-OOB mode. | |
1171 | */ | |
1172 | if ((neturg == 0) || (not42 == 0)) { | |
5d78ef73 GM |
1173 | n = write(net, nbackp, n); /* normal write */ |
1174 | } else { | |
1175 | n = neturg - nbackp; | |
1176 | /* | |
1177 | * In 4.2 (and 4.3) systems, there is some question about | |
1178 | * what byte in a sendOOB operation is the "OOB" data. | |
1179 | * To make ourselves compatible, we only send ONE byte | |
1180 | * out of band, the one WE THINK should be OOB (though | |
1181 | * we really have more the TCP philosophy of urgent data | |
1182 | * rather than the Unix philosophy of OOB data). | |
1183 | */ | |
1184 | if (n > 1) { | |
1185 | n = send(net, nbackp, n-1, 0); /* send URGENT all by itself */ | |
1186 | } else { | |
1187 | n = send(net, nbackp, n, MSG_OOB); /* URGENT data */ | |
1188 | } | |
1189 | } | |
1190 | } | |
1191 | if (n < 0) { | |
1192 | if (errno == EWOULDBLOCK) | |
1193 | return; | |
1194 | /* should blow this guy away... */ | |
1195 | return; | |
1196 | } | |
1197 | nbackp += n; | |
1198 | if (nbackp >= neturg) { | |
1199 | neturg = 0; | |
1200 | } | |
1201 | if (nbackp == nfrontp) { | |
1202 | nbackp = nfrontp = netobuf; | |
1203 | } | |
1204 | } | |
66b878f6 BJ |
1205 | |
1206 | cleanup() | |
1207 | { | |
66b878f6 BJ |
1208 | |
1209 | rmut(); | |
a7f6263e | 1210 | vhangup(); /* XXX */ |
ff24c640 | 1211 | shutdown(net, 2); |
66b878f6 BJ |
1212 | exit(1); |
1213 | } | |
1214 | ||
1215 | #include <utmp.h> | |
1216 | ||
1217 | struct utmp wtmp; | |
1218 | char wtmpf[] = "/usr/adm/wtmp"; | |
122f5efc JB |
1219 | char utmpf[] = "/etc/utmp"; |
1220 | #define SCPYN(a, b) strncpy(a, b, sizeof(a)) | |
1221 | #define SCMPN(a, b) strncmp(a, b, sizeof(a)) | |
66b878f6 BJ |
1222 | |
1223 | rmut() | |
1224 | { | |
1225 | register f; | |
1226 | int found = 0; | |
122f5efc JB |
1227 | struct utmp *u, *utmp; |
1228 | int nutmp; | |
1229 | struct stat statbf; | |
66b878f6 | 1230 | |
122f5efc | 1231 | f = open(utmpf, O_RDWR); |
66b878f6 | 1232 | if (f >= 0) { |
122f5efc JB |
1233 | fstat(f, &statbf); |
1234 | utmp = (struct utmp *)malloc(statbf.st_size); | |
1235 | if (!utmp) | |
1236 | syslog(LOG_ERR, "utmp malloc failed"); | |
1237 | if (statbf.st_size && utmp) { | |
1238 | nutmp = read(f, utmp, statbf.st_size); | |
1239 | nutmp /= sizeof(struct utmp); | |
1240 | ||
1241 | for (u = utmp ; u < &utmp[nutmp] ; u++) { | |
1242 | if (SCMPN(u->ut_line, line+5) || | |
1243 | u->ut_name[0]==0) | |
1244 | continue; | |
1245 | lseek(f, ((long)u)-((long)utmp), L_SET); | |
1246 | SCPYN(u->ut_name, ""); | |
1247 | SCPYN(u->ut_host, ""); | |
1248 | time(&u->ut_time); | |
1249 | write(f, (char *)u, sizeof(wtmp)); | |
1250 | found++; | |
1251 | } | |
66b878f6 BJ |
1252 | } |
1253 | close(f); | |
1254 | } | |
1255 | if (found) { | |
1a33b848 | 1256 | f = open(wtmpf, O_WRONLY|O_APPEND); |
66b878f6 BJ |
1257 | if (f >= 0) { |
1258 | SCPYN(wtmp.ut_line, line+5); | |
1259 | SCPYN(wtmp.ut_name, ""); | |
37c640e2 | 1260 | SCPYN(wtmp.ut_host, ""); |
66b878f6 | 1261 | time(&wtmp.ut_time); |
122f5efc | 1262 | write(f, (char *)&wtmp, sizeof(wtmp)); |
66b878f6 BJ |
1263 | close(f); |
1264 | } | |
1265 | } | |
1266 | chmod(line, 0666); | |
1267 | chown(line, 0, 0); | |
1268 | line[strlen("/dev/")] = 'p'; | |
1269 | chmod(line, 0666); | |
1270 | chown(line, 0, 0); | |
1271 | } |