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 |
d0a64c71 | 14 | static char sccsid[] = "@(#)telnetd.c 5.25 (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 | ||
d0a64c71 | 68 | #define BANNER "\r\n\r\n4.3 BSD UNIX (%s)\r\n\r\r\n\r" |
10dc182f | 69 | |
d8b5e42c GM |
70 | /* buffer for sub-options */ |
71 | char subbuffer[100], *subpointer= subbuffer, *subend= subbuffer; | |
affdaa4e | 72 | #define SB_CLEAR() subpointer = subbuffer; |
d8b5e42c | 73 | #define SB_TERM() { subend = subpointer; SB_CLEAR(); } |
affdaa4e GM |
74 | #define SB_ACCUM(c) if (subpointer < (subbuffer+sizeof subbuffer)) { \ |
75 | *subpointer++ = (c); \ | |
76 | } | |
d8b5e42c GM |
77 | #define SB_GET() ((*subpointer++)&0xff) |
78 | #define SB_EOF() (subpointer >= subend) | |
affdaa4e | 79 | |
66b878f6 BJ |
80 | int pcc, ncc; |
81 | ||
82 | int pty, net; | |
83 | int inter; | |
fe5c5547 | 84 | extern char **environ; |
66b878f6 | 85 | extern int errno; |
c29f876c | 86 | char *line; |
5d78ef73 GM |
87 | int SYNCHing = 0; /* we are in TELNET SYNCH mode */ |
88 | /* | |
89 | * The following are some clocks used to decide how to interpret | |
90 | * the relationship between various variables. | |
91 | */ | |
66b878f6 | 92 | |
5d78ef73 GM |
93 | struct { |
94 | int | |
95 | system, /* what the current time is */ | |
96 | echotoggle, /* last time user entered echo character */ | |
97 | modenegotiated, /* last time operating mode negotiated */ | |
98 | didnetreceive, /* last time we read data from network */ | |
d8b5e42c GM |
99 | ttypeopt, /* ttype will/won't received */ |
100 | ttypesubopt, /* ttype subopt is received */ | |
101 | getterminal, /* time started to get terminal information */ | |
5d78ef73 GM |
102 | gotDM; /* when did we last see a data mark */ |
103 | } clocks; | |
104 | ||
d8b5e42c GM |
105 | #define settimer(x) (clocks.x = ++clocks.system) |
106 | #define sequenceIs(x,y) (clocks.x < clocks.y) | |
5d78ef73 | 107 | \f |
66b878f6 BJ |
108 | main(argc, argv) |
109 | char *argv[]; | |
110 | { | |
bb933cc2 | 111 | struct sockaddr_in from; |
bcb894cb | 112 | int on = 1, fromlen; |
bb933cc2 | 113 | |
5d78ef73 GM |
114 | #if defined(DEBUG) |
115 | { | |
116 | int s, ns, foo; | |
117 | struct servent *sp; | |
118 | static struct sockaddr_in sin = { AF_INET }; | |
119 | ||
120 | sp = getservbyname("telnet", "tcp"); | |
121 | if (sp == 0) { | |
122 | fprintf(stderr, "telnetd: tcp/telnet: unknown service\n"); | |
123 | exit(1); | |
124 | } | |
125 | sin.sin_port = sp->s_port; | |
126 | argc--, argv++; | |
127 | if (argc > 0) { | |
128 | sin.sin_port = atoi(*argv); | |
129 | sin.sin_port = htons((u_short)sin.sin_port); | |
130 | } | |
131 | ||
132 | s = socket(AF_INET, SOCK_STREAM, 0); | |
133 | if (s < 0) { | |
134 | perror("telnetd: socket");; | |
135 | exit(1); | |
136 | } | |
137 | if (bind(s, &sin, sizeof sin) < 0) { | |
138 | perror("bind"); | |
139 | exit(1); | |
140 | } | |
141 | if (listen(s, 1) < 0) { | |
142 | perror("listen"); | |
143 | exit(1); | |
144 | } | |
145 | foo = sizeof sin; | |
146 | ns = accept(s, &sin, &foo); | |
147 | if (ns < 0) { | |
148 | perror("accept"); | |
149 | exit(1); | |
150 | } | |
151 | dup2(ns, 0); | |
152 | close(s); | |
153 | } | |
154 | #endif /* defined(DEBUG) */ | |
076ae92c | 155 | openlog("telnetd", LOG_PID | LOG_ODELAY, LOG_DAEMON); |
bb933cc2 MK |
156 | fromlen = sizeof (from); |
157 | if (getpeername(0, &from, &fromlen) < 0) { | |
158 | fprintf(stderr, "%s: ", argv[0]); | |
159 | perror("getpeername"); | |
160 | _exit(1); | |
de3b21e8 | 161 | } |
bcb894cb | 162 | if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof (on)) < 0) { |
3f99c0f7 | 163 | syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); |
de3b21e8 | 164 | } |
bb933cc2 | 165 | doit(0, &from); |
f553aca8 SL |
166 | } |
167 | ||
d8b5e42c GM |
168 | char *terminaltype = 0; |
169 | char *envinit[2]; | |
170 | int cleanup(); | |
affdaa4e GM |
171 | |
172 | /* | |
d8b5e42c | 173 | * ttloop |
affdaa4e | 174 | * |
d8b5e42c GM |
175 | * A small subroutine to flush the network output buffer, get some data |
176 | * from the network, and pass it through the telnet state machine. We | |
177 | * also flush the pty input buffer (by dropping its data) if it becomes | |
178 | * too full. | |
179 | */ | |
180 | ||
181 | void | |
182 | ttloop() | |
183 | { | |
184 | if (nfrontp-nbackp) { | |
185 | netflush(); | |
186 | } | |
187 | ncc = read(net, netibuf, sizeof netibuf); | |
188 | if (ncc < 0) { | |
189 | syslog(LOG_INFO, "ttloop: read: %m\n"); | |
10a3b37e GM |
190 | exit(1); |
191 | } else if (ncc == 0) { | |
192 | syslog(LOG_INFO, "ttloop: peer died: %m\n"); | |
193 | exit(1); | |
d8b5e42c GM |
194 | } |
195 | netip = netibuf; | |
196 | telrcv(); /* state machine */ | |
197 | if (ncc > 0) { | |
198 | pfrontp = pbackp = ptyobuf; | |
199 | telrcv(); | |
200 | } | |
201 | } | |
202 | ||
203 | /* | |
204 | * getterminaltype | |
affdaa4e | 205 | * |
d8b5e42c GM |
206 | * Ask the other end to send along its terminal type. |
207 | * Output is the variable terminaltype filled in. | |
affdaa4e GM |
208 | */ |
209 | ||
d8b5e42c GM |
210 | void |
211 | getterminaltype() | |
affdaa4e | 212 | { |
d8b5e42c | 213 | static char sbuf[] = { IAC, DO, TELOPT_TTYPE }; |
affdaa4e | 214 | |
d8b5e42c GM |
215 | settimer(getterminal); |
216 | bcopy(sbuf, nfrontp, sizeof sbuf); | |
217 | nfrontp += sizeof sbuf; | |
10a3b37e | 218 | hisopts[TELOPT_TTYPE] = OPT_YES_BUT_ALWAYS_LOOK; |
d8b5e42c GM |
219 | while (sequenceIs(ttypeopt, getterminal)) { |
220 | ttloop(); | |
affdaa4e | 221 | } |
d8b5e42c GM |
222 | if (hisopts[TELOPT_TTYPE] == OPT_YES) { |
223 | static char sbbuf[] = { IAC, SB, TELOPT_TTYPE, TELQUAL_SEND, IAC, SE }; | |
affdaa4e | 224 | |
d8b5e42c GM |
225 | bcopy(sbbuf, nfrontp, sizeof sbbuf); |
226 | nfrontp += sizeof sbbuf; | |
227 | while (sequenceIs(ttypesubopt, getterminal)) { | |
228 | ttloop(); | |
229 | } | |
230 | } | |
231 | } | |
66b878f6 BJ |
232 | |
233 | /* | |
234 | * Get a pty, scan input lines. | |
235 | */ | |
37c640e2 SL |
236 | doit(f, who) |
237 | int f; | |
238 | struct sockaddr_in *who; | |
66b878f6 | 239 | { |
c29f876c | 240 | char *host, *inet_ntoa(); |
1a33b848 | 241 | int i, p, t; |
66b878f6 | 242 | struct sgttyb b; |
37c640e2 | 243 | struct hostent *hp; |
affdaa4e | 244 | int c; |
1a33b848 | 245 | |
c29f876c MK |
246 | for (c = 'p'; c <= 's'; c++) { |
247 | struct stat stb; | |
248 | ||
249 | line = "/dev/ptyXX"; | |
250 | line[strlen("/dev/pty")] = c; | |
251 | line[strlen("/dev/ptyp")] = '0'; | |
252 | if (stat(line, &stb) < 0) | |
253 | break; | |
1a33b848 | 254 | for (i = 0; i < 16; i++) { |
c29f876c MK |
255 | line[strlen("/dev/ptyp")] = "0123456789abcdef"[i]; |
256 | p = open(line, 2); | |
1a33b848 SL |
257 | if (p > 0) |
258 | goto gotpty; | |
259 | } | |
66b878f6 | 260 | } |
8f2758db SL |
261 | fatal(f, "All network ports in use"); |
262 | /*NOTREACHED*/ | |
66b878f6 BJ |
263 | gotpty: |
264 | dup2(f, 0); | |
c29f876c | 265 | line[strlen("/dev/")] = 't'; |
1a33b848 | 266 | t = open("/dev/tty", O_RDWR); |
66b878f6 BJ |
267 | if (t >= 0) { |
268 | ioctl(t, TIOCNOTTY, 0); | |
269 | close(t); | |
270 | } | |
c29f876c | 271 | t = open(line, O_RDWR); |
8f2758db | 272 | if (t < 0) |
c29f876c | 273 | fatalperror(f, line, errno); |
66b878f6 | 274 | ioctl(t, TIOCGETP, &b); |
9ef3087d | 275 | b.sg_flags = CRMOD|XTABS|ANYP; |
66b878f6 | 276 | ioctl(t, TIOCSETP, &b); |
9ef3087d | 277 | ioctl(p, TIOCGETP, &b); |
da96b661 | 278 | b.sg_flags &= ~ECHO; |
9ef3087d | 279 | ioctl(p, TIOCSETP, &b); |
37c640e2 SL |
280 | hp = gethostbyaddr(&who->sin_addr, sizeof (struct in_addr), |
281 | who->sin_family); | |
282 | if (hp) | |
283 | host = hp->h_name; | |
284 | else | |
05fa5465 | 285 | host = inet_ntoa(who->sin_addr); |
d8b5e42c GM |
286 | |
287 | net = f; | |
288 | pty = p; | |
289 | ||
290 | /* | |
291 | * get terminal type. | |
292 | */ | |
293 | getterminaltype(); | |
294 | ||
8f2758db SL |
295 | if ((i = fork()) < 0) |
296 | fatalperror(f, "fork", errno); | |
66b878f6 BJ |
297 | if (i) |
298 | telnet(f, p); | |
299 | close(f); | |
300 | close(p); | |
301 | dup2(t, 0); | |
302 | dup2(t, 1); | |
303 | dup2(t, 2); | |
304 | close(t); | |
d8b5e42c GM |
305 | envinit[0] = terminaltype; |
306 | envinit[1] = 0; | |
fe5c5547 | 307 | environ = envinit; |
affdaa4e GM |
308 | /* |
309 | * -h : pass on name of host. | |
d8b5e42c GM |
310 | * WARNING: -h is accepted by login if and only if |
311 | * getuid() == 0. | |
affdaa4e GM |
312 | * -p : don't clobber the environment (so terminal type stays set). |
313 | */ | |
314 | execl("/bin/login", "login", "-h", host, | |
d8b5e42c | 315 | terminaltype ? "-p" : 0, 0); |
8f2758db SL |
316 | fatalperror(f, "/bin/login", errno); |
317 | /*NOTREACHED*/ | |
318 | } | |
319 | ||
320 | fatal(f, msg) | |
321 | int f; | |
322 | char *msg; | |
323 | { | |
324 | char buf[BUFSIZ]; | |
325 | ||
1a33b848 | 326 | (void) sprintf(buf, "telnetd: %s.\r\n", msg); |
8f2758db | 327 | (void) write(f, buf, strlen(buf)); |
66b878f6 BJ |
328 | exit(1); |
329 | } | |
330 | ||
8f2758db SL |
331 | fatalperror(f, msg, errno) |
332 | int f; | |
333 | char *msg; | |
334 | int errno; | |
335 | { | |
336 | char buf[BUFSIZ]; | |
337 | extern char *sys_errlist[]; | |
338 | ||
1a33b848 | 339 | (void) sprintf(buf, "%s: %s\r\n", msg, sys_errlist[errno]); |
8f2758db SL |
340 | fatal(f, buf); |
341 | } | |
342 | ||
5d78ef73 GM |
343 | |
344 | /* | |
345 | * Check a descriptor to see if out of band data exists on it. | |
346 | */ | |
347 | ||
348 | ||
349 | stilloob(s) | |
350 | int s; /* socket number */ | |
351 | { | |
352 | static struct timeval timeout = { 0 }; | |
353 | fd_set excepts; | |
354 | int value; | |
355 | ||
356 | do { | |
357 | FD_ZERO(&excepts); | |
358 | FD_SET(s, &excepts); | |
359 | value = select(s+1, (fd_set *)0, (fd_set *)0, &excepts, &timeout); | |
5eddff6d | 360 | } while ((value == -1) && (errno == EINTR)); |
5d78ef73 GM |
361 | |
362 | if (value < 0) { | |
363 | fatalperror(pty, "select", errno); | |
364 | } | |
365 | if (FD_ISSET(s, &excepts)) { | |
366 | return 1; | |
367 | } else { | |
368 | return 0; | |
369 | } | |
370 | } | |
371 | \f | |
66b878f6 BJ |
372 | /* |
373 | * Main loop. Select from pty and network, and | |
374 | * hand data to telnet receiver finite state machine. | |
375 | */ | |
376 | telnet(f, p) | |
377 | { | |
378 | int on = 1; | |
5eddff6d | 379 | char hostname[MAXHOSTNAMELEN]; |
d0a64c71 GM |
380 | #define TABBUFSIZ 512 |
381 | char defent[TABBUFSIZ]; | |
382 | char defstrs[TABBUFSIZ]; | |
383 | #undef TABBUFSIZ | |
384 | char *HE; | |
385 | char *HN; | |
386 | char *IM; | |
66b878f6 | 387 | |
66b878f6 BJ |
388 | ioctl(f, FIONBIO, &on); |
389 | ioctl(p, FIONBIO, &on); | |
4701a1c1 | 390 | ioctl(p, TIOCPKT, &on); |
affdaa4e GM |
391 | #if defined(SO_OOBINLINE) |
392 | setsockopt(net, SOL_SOCKET, SO_OOBINLINE, &on, sizeof on); | |
393 | #endif /* defined(SO_OOBINLINE) */ | |
66b878f6 | 394 | signal(SIGTSTP, SIG_IGN); |
9eebc521 GM |
395 | /* |
396 | * Ignoring SIGTTOU keeps the kernel from blocking us | |
397 | * in ttioctl() in /sys/tty.c. | |
398 | */ | |
399 | signal(SIGTTOU, SIG_IGN); | |
8a53982e | 400 | signal(SIGCHLD, cleanup); |
f4c5d9f9 | 401 | setpgrp(0, 0); |
66b878f6 | 402 | |
da96b661 | 403 | /* |
5d78ef73 | 404 | * Request to do remote echo and to suppress go ahead. |
da96b661 | 405 | */ |
d8b5e42c GM |
406 | if (!myopts[TELOPT_ECHO]) { |
407 | dooption(TELOPT_ECHO); | |
408 | } | |
409 | if (!myopts[TELOPT_SGA]) { | |
410 | dooption(TELOPT_SGA); | |
411 | } | |
affdaa4e GM |
412 | /* |
413 | * Is the client side a 4.2 (NOT 4.3) system? We need to know this | |
414 | * because 4.2 clients are unable to deal with TCP urgent data. | |
415 | * | |
416 | * To find out, we send out a "DO ECHO". If the remote system | |
417 | * answers "WILL ECHO" it is probably a 4.2 client, and we note | |
418 | * that fact ("WILL ECHO" ==> that the client will echo what | |
419 | * WE, the server, sends it; it does NOT mean that the client will | |
420 | * echo the terminal input). | |
421 | */ | |
9bd38ba8 | 422 | (void) sprintf(nfrontp, doopt, TELOPT_ECHO); |
affdaa4e | 423 | nfrontp += sizeof doopt-2; |
d8b5e42c | 424 | hisopts[TELOPT_ECHO] = OPT_YES_BUT_ALWAYS_LOOK; |
affdaa4e | 425 | |
0c285f22 SL |
426 | /* |
427 | * Show banner that getty never gave. | |
10dc182f | 428 | * |
d0a64c71 GM |
429 | * We put the banner in the pty input buffer. This way, it |
430 | * gets carriage return null processing, etc., just like all | |
431 | * other pty --> client data. | |
0c285f22 | 432 | */ |
10dc182f | 433 | |
0c285f22 | 434 | gethostname(hostname, sizeof (hostname)); |
d0a64c71 GM |
435 | if (getent(defent, "default") == 1) { |
436 | char *getstr(); | |
437 | char *p=defstrs; | |
438 | ||
439 | HE = getstr("he", &p); | |
440 | HN = getstr("hn", &p); | |
441 | IM = getstr("im", &p); | |
442 | if (HN && *HN) | |
443 | strcpy(hostname, HN); | |
444 | edithost(HE, hostname); | |
445 | if (IM && *IM) | |
446 | putf(IM, ptyibuf+1, p); | |
447 | } else { | |
448 | sprintf(ptyibuf+1, BANNER, hostname); | |
449 | } | |
10dc182f | 450 | |
d0a64c71 GM |
451 | ptyip = ptyibuf+1; /* Prime the pump */ |
452 | pcc = strlen(ptyip); /* ditto */ | |
affdaa4e | 453 | |
4701a1c1 GM |
454 | /* Clear ptybuf[0] - where the packet information is received */ |
455 | ptyibuf[0] = 0; | |
d0a64c71 | 456 | |
affdaa4e GM |
457 | /* |
458 | * Call telrcv() once to pick up anything received during | |
459 | * terminal type negotiation. | |
460 | */ | |
461 | telrcv(); | |
462 | ||
66b878f6 | 463 | for (;;) { |
5d78ef73 | 464 | fd_set ibits, obits, xbits; |
66b878f6 BJ |
465 | register int c; |
466 | ||
5d78ef73 GM |
467 | if (ncc < 0 && pcc < 0) |
468 | break; | |
469 | ||
470 | FD_ZERO(&ibits); | |
471 | FD_ZERO(&obits); | |
472 | FD_ZERO(&xbits); | |
66b878f6 BJ |
473 | /* |
474 | * Never look for input if there's still | |
475 | * stuff in the corresponding output buffer | |
476 | */ | |
5d78ef73 GM |
477 | if (nfrontp - nbackp || pcc > 0) { |
478 | FD_SET(f, &obits); | |
4701a1c1 | 479 | FD_SET(p, &xbits); |
5d78ef73 GM |
480 | } else { |
481 | FD_SET(p, &ibits); | |
482 | } | |
483 | if (pfrontp - pbackp || ncc > 0) { | |
484 | FD_SET(p, &obits); | |
485 | } else { | |
486 | FD_SET(f, &ibits); | |
487 | } | |
488 | if (!SYNCHing) { | |
489 | FD_SET(f, &xbits); | |
490 | } | |
491 | if ((c = select(16, &ibits, &obits, &xbits, | |
492 | (struct timeval *)0)) < 1) { | |
493 | if (c == -1) { | |
494 | if (errno == EINTR) { | |
495 | continue; | |
496 | } | |
497 | } | |
66b878f6 BJ |
498 | sleep(5); |
499 | continue; | |
500 | } | |
501 | ||
5d78ef73 GM |
502 | /* |
503 | * Any urgent data? | |
504 | */ | |
505 | if (FD_ISSET(net, &xbits)) { | |
506 | SYNCHing = 1; | |
507 | } | |
508 | ||
66b878f6 BJ |
509 | /* |
510 | * Something to read from the network... | |
511 | */ | |
5d78ef73 | 512 | if (FD_ISSET(net, &ibits)) { |
affdaa4e | 513 | #if !defined(SO_OOBINLINE) |
5d78ef73 | 514 | /* |
5eddff6d | 515 | * In 4.2 (and 4.3 beta) systems, the |
5d78ef73 GM |
516 | * OOB indication and data handling in the kernel |
517 | * is such that if two separate TCP Urgent requests | |
518 | * come in, one byte of TCP data will be overlaid. | |
519 | * This is fatal for Telnet, but we try to live | |
520 | * with it. | |
521 | * | |
522 | * In addition, in 4.2 (and...), a special protocol | |
523 | * is needed to pick up the TCP Urgent data in | |
524 | * the correct sequence. | |
525 | * | |
526 | * What we do is: if we think we are in urgent | |
527 | * mode, we look to see if we are "at the mark". | |
528 | * If we are, we do an OOB receive. If we run | |
529 | * this twice, we will do the OOB receive twice, | |
530 | * but the second will fail, since the second | |
531 | * time we were "at the mark", but there wasn't | |
532 | * any data there (the kernel doesn't reset | |
533 | * "at the mark" until we do a normal read). | |
534 | * Once we've read the OOB data, we go ahead | |
535 | * and do normal reads. | |
536 | * | |
537 | * There is also another problem, which is that | |
538 | * since the OOB byte we read doesn't put us | |
539 | * out of OOB state, and since that byte is most | |
540 | * likely the TELNET DM (data mark), we would | |
541 | * stay in the TELNET SYNCH (SYNCHing) state. | |
542 | * So, clocks to the rescue. If we've "just" | |
543 | * received a DM, then we test for the | |
544 | * presence of OOB data when the receive OOB | |
545 | * fails (and AFTER we did the normal mode read | |
546 | * to clear "at the mark"). | |
547 | */ | |
548 | if (SYNCHing) { | |
549 | int atmark; | |
550 | ||
551 | ioctl(net, SIOCATMARK, (char *)&atmark); | |
552 | if (atmark) { | |
553 | ncc = recv(net, netibuf, sizeof (netibuf), MSG_OOB); | |
554 | if ((ncc == -1) && (errno == EINVAL)) { | |
555 | ncc = read(net, netibuf, sizeof (netibuf)); | |
d8b5e42c | 556 | if (sequenceIs(didnetreceive, gotDM)) { |
5d78ef73 GM |
557 | SYNCHing = stilloob(net); |
558 | } | |
559 | } | |
560 | } else { | |
561 | ncc = read(net, netibuf, sizeof (netibuf)); | |
66b878f6 | 562 | } |
5d78ef73 GM |
563 | } else { |
564 | ncc = read(net, netibuf, sizeof (netibuf)); | |
565 | } | |
566 | settimer(didnetreceive); | |
affdaa4e | 567 | #else /* !defined(SO_OOBINLINE)) */ |
5d78ef73 | 568 | ncc = read(net, netibuf, sizeof (netibuf)); |
affdaa4e | 569 | #endif /* !defined(SO_OOBINLINE)) */ |
5d78ef73 GM |
570 | if (ncc < 0 && errno == EWOULDBLOCK) |
571 | ncc = 0; | |
572 | else { | |
573 | if (ncc <= 0) { | |
574 | break; | |
575 | } | |
576 | netip = netibuf; | |
577 | } | |
66b878f6 BJ |
578 | } |
579 | ||
580 | /* | |
581 | * Something to read from the pty... | |
582 | */ | |
4701a1c1 GM |
583 | if (FD_ISSET(p, &xbits)) { |
584 | if (read(p, ptyibuf, 1) != 1) { | |
585 | break; | |
586 | } | |
587 | } | |
5d78ef73 | 588 | if (FD_ISSET(p, &ibits)) { |
66b878f6 BJ |
589 | pcc = read(p, ptyibuf, BUFSIZ); |
590 | if (pcc < 0 && errno == EWOULDBLOCK) | |
591 | pcc = 0; | |
592 | else { | |
593 | if (pcc <= 0) | |
594 | break; | |
4701a1c1 GM |
595 | /* Skip past "packet" */ |
596 | pcc--; | |
597 | ptyip = ptyibuf+1; | |
66b878f6 BJ |
598 | } |
599 | } | |
4701a1c1 GM |
600 | if (ptyibuf[0] & TIOCPKT_FLUSHWRITE) { |
601 | netclear(); /* clear buffer back */ | |
602 | *nfrontp++ = IAC; | |
603 | *nfrontp++ = DM; | |
604 | neturg = nfrontp-1; /* off by one XXX */ | |
605 | ptyibuf[0] = 0; | |
606 | } | |
66b878f6 BJ |
607 | |
608 | while (pcc > 0) { | |
609 | if ((&netobuf[BUFSIZ] - nfrontp) < 2) | |
610 | break; | |
611 | c = *ptyip++ & 0377, pcc--; | |
612 | if (c == IAC) | |
613 | *nfrontp++ = c; | |
614 | *nfrontp++ = c; | |
bdb993e7 KB |
615 | /* Don't do CR-NUL if we are in binary mode */ |
616 | if ((c == '\r') && (myopts[TELOPT_BINARY] == OPT_NO)) { | |
9f515693 GM |
617 | if (pcc > 0 && ((*ptyip & 0377) == '\n')) { |
618 | *nfrontp++ = *ptyip++ & 0377; | |
619 | pcc--; | |
620 | } else | |
621 | *nfrontp++ = '\0'; | |
622 | } | |
66b878f6 | 623 | } |
5d78ef73 | 624 | if (FD_ISSET(f, &obits) && (nfrontp - nbackp) > 0) |
66b878f6 BJ |
625 | netflush(); |
626 | if (ncc > 0) | |
627 | telrcv(); | |
5d78ef73 | 628 | if (FD_ISSET(p, &obits) && (pfrontp - pbackp) > 0) |
66b878f6 BJ |
629 | ptyflush(); |
630 | } | |
631 | cleanup(); | |
632 | } | |
633 | ||
634 | /* | |
635 | * State for recv fsm | |
636 | */ | |
637 | #define TS_DATA 0 /* base state */ | |
638 | #define TS_IAC 1 /* look for double IAC's */ | |
639 | #define TS_CR 2 /* CR-LF ->'s CR */ | |
affdaa4e GM |
640 | #define TS_SB 3 /* throw away begin's... */ |
641 | #define TS_SE 4 /* ...end's (suboption negotiation) */ | |
66b878f6 BJ |
642 | #define TS_WILL 5 /* will option negotiation */ |
643 | #define TS_WONT 6 /* wont " */ | |
644 | #define TS_DO 7 /* do " */ | |
645 | #define TS_DONT 8 /* dont " */ | |
646 | ||
647 | telrcv() | |
648 | { | |
649 | register int c; | |
650 | static int state = TS_DATA; | |
66b878f6 BJ |
651 | |
652 | while (ncc > 0) { | |
653 | if ((&ptyobuf[BUFSIZ] - pfrontp) < 2) | |
654 | return; | |
655 | c = *netip++ & 0377, ncc--; | |
656 | switch (state) { | |
657 | ||
8356bfad GM |
658 | case TS_CR: |
659 | state = TS_DATA; | |
07f70d31 | 660 | /* Strip off \n or \0 after a \r */ |
a6d8450f | 661 | if ((c == 0) || (c == '\n')) { |
8356bfad | 662 | break; |
a6d8450f | 663 | } |
8356bfad GM |
664 | /* FALL THROUGH */ |
665 | ||
66b878f6 BJ |
666 | case TS_DATA: |
667 | if (c == IAC) { | |
668 | state = TS_IAC; | |
669 | break; | |
670 | } | |
671 | if (inter > 0) | |
672 | break; | |
9f515693 | 673 | /* |
07f70d31 GM |
674 | * We now map \r\n ==> \r for pragmatic reasons. |
675 | * Many client implementations send \r\n when | |
676 | * the user hits the CarriageReturn key. | |
677 | * | |
678 | * We USED to map \r\n ==> \n, since \r\n says | |
9f515693 GM |
679 | * that we want to be in column 1 of the next |
680 | * printable line, and \n is the standard | |
681 | * unix way of saying that (\r is only good | |
682 | * if CRMOD is set, which it normally is). | |
683 | */ | |
bdb993e7 | 684 | if ((c == '\r') && (hisopts[TELOPT_BINARY] == OPT_NO)) { |
07f70d31 | 685 | state = TS_CR; |
a6d8450f GM |
686 | } |
687 | *pfrontp++ = c; | |
66b878f6 BJ |
688 | break; |
689 | ||
690 | case TS_IAC: | |
691 | switch (c) { | |
692 | ||
693 | /* | |
694 | * Send the process on the pty side an | |
695 | * interrupt. Do this with a NULL or | |
696 | * interrupt char; depending on the tty mode. | |
697 | */ | |
66b878f6 BJ |
698 | case IP: |
699 | interrupt(); | |
700 | break; | |
701 | ||
a65453b7 GM |
702 | case BREAK: |
703 | sendbrk(); | |
704 | break; | |
705 | ||
66b878f6 BJ |
706 | /* |
707 | * Are You There? | |
708 | */ | |
709 | case AYT: | |
1a33b848 SL |
710 | strcpy(nfrontp, "\r\n[Yes]\r\n"); |
711 | nfrontp += 9; | |
66b878f6 BJ |
712 | break; |
713 | ||
5d78ef73 GM |
714 | /* |
715 | * Abort Output | |
716 | */ | |
717 | case AO: { | |
718 | struct ltchars tmpltc; | |
719 | ||
720 | ptyflush(); /* half-hearted */ | |
721 | ioctl(pty, TIOCGLTC, &tmpltc); | |
722 | if (tmpltc.t_flushc != '\377') { | |
723 | *pfrontp++ = tmpltc.t_flushc; | |
724 | } | |
615dc3cd | 725 | netclear(); /* clear buffer back */ |
5d78ef73 GM |
726 | *nfrontp++ = IAC; |
727 | *nfrontp++ = DM; | |
c77c3bec | 728 | neturg = nfrontp-1; /* off by one XXX */ |
5d78ef73 GM |
729 | break; |
730 | } | |
731 | ||
66b878f6 BJ |
732 | /* |
733 | * Erase Character and | |
734 | * Erase Line | |
735 | */ | |
736 | case EC: | |
5d78ef73 GM |
737 | case EL: { |
738 | struct sgttyb b; | |
739 | char ch; | |
740 | ||
741 | ptyflush(); /* half-hearted */ | |
742 | ioctl(pty, TIOCGETP, &b); | |
743 | ch = (c == EC) ? | |
744 | b.sg_erase : b.sg_kill; | |
745 | if (ch != '\377') { | |
746 | *pfrontp++ = ch; | |
747 | } | |
748 | break; | |
749 | } | |
66b878f6 BJ |
750 | |
751 | /* | |
752 | * Check for urgent data... | |
753 | */ | |
754 | case DM: | |
5d78ef73 GM |
755 | SYNCHing = stilloob(net); |
756 | settimer(gotDM); | |
66b878f6 BJ |
757 | break; |
758 | ||
5d78ef73 | 759 | |
66b878f6 BJ |
760 | /* |
761 | * Begin option subnegotiation... | |
762 | */ | |
763 | case SB: | |
affdaa4e | 764 | state = TS_SB; |
66b878f6 BJ |
765 | continue; |
766 | ||
767 | case WILL: | |
0e376915 GM |
768 | state = TS_WILL; |
769 | continue; | |
770 | ||
66b878f6 | 771 | case WONT: |
0e376915 GM |
772 | state = TS_WONT; |
773 | continue; | |
774 | ||
66b878f6 | 775 | case DO: |
0e376915 GM |
776 | state = TS_DO; |
777 | continue; | |
778 | ||
66b878f6 | 779 | case DONT: |
0e376915 | 780 | state = TS_DONT; |
66b878f6 BJ |
781 | continue; |
782 | ||
783 | case IAC: | |
784 | *pfrontp++ = c; | |
785 | break; | |
786 | } | |
787 | state = TS_DATA; | |
788 | break; | |
789 | ||
affdaa4e GM |
790 | case TS_SB: |
791 | if (c == IAC) { | |
792 | state = TS_SE; | |
793 | } else { | |
794 | SB_ACCUM(c); | |
795 | } | |
66b878f6 BJ |
796 | break; |
797 | ||
affdaa4e GM |
798 | case TS_SE: |
799 | if (c != SE) { | |
800 | if (c != IAC) { | |
801 | SB_ACCUM(IAC); | |
802 | } | |
803 | SB_ACCUM(c); | |
804 | state = TS_SB; | |
805 | } else { | |
806 | SB_TERM(); | |
807 | suboption(); /* handle sub-option */ | |
808 | state = TS_DATA; | |
809 | } | |
66b878f6 BJ |
810 | break; |
811 | ||
812 | case TS_WILL: | |
d8b5e42c | 813 | if (hisopts[c] != OPT_YES) |
66b878f6 BJ |
814 | willoption(c); |
815 | state = TS_DATA; | |
816 | continue; | |
817 | ||
818 | case TS_WONT: | |
d8b5e42c | 819 | if (hisopts[c] != OPT_NO) |
66b878f6 BJ |
820 | wontoption(c); |
821 | state = TS_DATA; | |
822 | continue; | |
823 | ||
824 | case TS_DO: | |
d8b5e42c | 825 | if (myopts[c] != OPT_YES) |
66b878f6 BJ |
826 | dooption(c); |
827 | state = TS_DATA; | |
828 | continue; | |
829 | ||
830 | case TS_DONT: | |
d8b5e42c | 831 | if (myopts[c] != OPT_NO) { |
affdaa4e | 832 | dontoption(c); |
66b878f6 BJ |
833 | } |
834 | state = TS_DATA; | |
835 | continue; | |
836 | ||
837 | default: | |
5eddff6d | 838 | syslog(LOG_ERR, "telnetd: panic state=%d\n", state); |
de3b21e8 | 839 | printf("telnetd: panic state=%d\n", state); |
66b878f6 BJ |
840 | exit(1); |
841 | } | |
842 | } | |
843 | } | |
844 | ||
845 | willoption(option) | |
846 | int option; | |
847 | { | |
848 | char *fmt; | |
849 | ||
850 | switch (option) { | |
851 | ||
852 | case TELOPT_BINARY: | |
853 | mode(RAW, 0); | |
0e376915 GM |
854 | fmt = doopt; |
855 | break; | |
66b878f6 BJ |
856 | |
857 | case TELOPT_ECHO: | |
affdaa4e GM |
858 | not42 = 0; /* looks like a 4.2 system */ |
859 | /* | |
860 | * Now, in a 4.2 system, to break them out of ECHOing | |
861 | * (to the terminal) mode, we need to send a "WILL ECHO". | |
862 | * Kludge upon kludge! | |
863 | */ | |
d8b5e42c | 864 | if (myopts[TELOPT_ECHO] == OPT_YES) { |
affdaa4e GM |
865 | dooption(TELOPT_ECHO); |
866 | } | |
867 | fmt = dont; | |
0e376915 | 868 | break; |
66b878f6 | 869 | |
affdaa4e | 870 | case TELOPT_TTYPE: |
d8b5e42c GM |
871 | settimer(ttypeopt); |
872 | if (hisopts[TELOPT_TTYPE] == OPT_YES_BUT_ALWAYS_LOOK) { | |
873 | hisopts[TELOPT_TTYPE] = OPT_YES; | |
874 | return; | |
875 | } | |
876 | fmt = doopt; | |
877 | break; | |
878 | ||
66b878f6 | 879 | case TELOPT_SGA: |
66b878f6 BJ |
880 | fmt = doopt; |
881 | break; | |
882 | ||
883 | case TELOPT_TM: | |
884 | fmt = dont; | |
885 | break; | |
886 | ||
887 | default: | |
888 | fmt = dont; | |
889 | break; | |
890 | } | |
0e376915 | 891 | if (fmt == doopt) { |
d8b5e42c | 892 | hisopts[option] = OPT_YES; |
0e376915 | 893 | } else { |
d8b5e42c | 894 | hisopts[option] = OPT_NO; |
0e376915 | 895 | } |
9bd38ba8 | 896 | (void) sprintf(nfrontp, fmt, option); |
da96b661 | 897 | nfrontp += sizeof (dont) - 2; |
66b878f6 BJ |
898 | } |
899 | ||
900 | wontoption(option) | |
901 | int option; | |
902 | { | |
903 | char *fmt; | |
904 | ||
905 | switch (option) { | |
66b878f6 | 906 | case TELOPT_ECHO: |
affdaa4e | 907 | not42 = 1; /* doesn't seem to be a 4.2 system */ |
0e376915 | 908 | break; |
66b878f6 BJ |
909 | |
910 | case TELOPT_BINARY: | |
911 | mode(0, RAW); | |
66b878f6 | 912 | break; |
10a3b37e GM |
913 | |
914 | case TELOPT_TTYPE: | |
915 | settimer(ttypeopt); | |
916 | break; | |
66b878f6 | 917 | } |
10a3b37e | 918 | |
0e376915 | 919 | fmt = dont; |
d8b5e42c | 920 | hisopts[option] = OPT_NO; |
9bd38ba8 | 921 | (void) sprintf(nfrontp, fmt, option); |
da96b661 | 922 | nfrontp += sizeof (doopt) - 2; |
66b878f6 BJ |
923 | } |
924 | ||
925 | dooption(option) | |
926 | int option; | |
927 | { | |
928 | char *fmt; | |
929 | ||
930 | switch (option) { | |
931 | ||
932 | case TELOPT_TM: | |
933 | fmt = wont; | |
934 | break; | |
935 | ||
936 | case TELOPT_ECHO: | |
937 | mode(ECHO|CRMOD, 0); | |
0e376915 GM |
938 | fmt = will; |
939 | break; | |
66b878f6 BJ |
940 | |
941 | case TELOPT_BINARY: | |
942 | mode(RAW, 0); | |
0e376915 GM |
943 | fmt = will; |
944 | break; | |
66b878f6 BJ |
945 | |
946 | case TELOPT_SGA: | |
66b878f6 BJ |
947 | fmt = will; |
948 | break; | |
949 | ||
950 | default: | |
951 | fmt = wont; | |
952 | break; | |
953 | } | |
0e376915 | 954 | if (fmt == will) { |
d8b5e42c | 955 | myopts[option] = OPT_YES; |
0e376915 | 956 | } else { |
d8b5e42c | 957 | myopts[option] = OPT_NO; |
0e376915 | 958 | } |
9bd38ba8 | 959 | (void) sprintf(nfrontp, fmt, option); |
da96b661 | 960 | nfrontp += sizeof (doopt) - 2; |
66b878f6 BJ |
961 | } |
962 | ||
affdaa4e GM |
963 | |
964 | dontoption(option) | |
965 | int option; | |
966 | { | |
967 | char *fmt; | |
968 | ||
969 | switch (option) { | |
970 | case TELOPT_ECHO: /* we should stop echoing */ | |
38260ba2 | 971 | mode(0, ECHO); |
affdaa4e GM |
972 | fmt = wont; |
973 | break; | |
d8b5e42c | 974 | |
affdaa4e GM |
975 | default: |
976 | fmt = wont; | |
977 | break; | |
978 | } | |
d8b5e42c | 979 | |
affdaa4e | 980 | if (fmt = wont) { |
d8b5e42c | 981 | myopts[option] = OPT_NO; |
affdaa4e | 982 | } else { |
d8b5e42c | 983 | myopts[option] = OPT_YES; |
affdaa4e | 984 | } |
9bd38ba8 | 985 | (void) sprintf(nfrontp, fmt, option); |
affdaa4e GM |
986 | nfrontp += sizeof (wont) - 2; |
987 | } | |
988 | ||
989 | /* | |
990 | * suboption() | |
991 | * | |
992 | * Look at the sub-option buffer, and try to be helpful to the other | |
993 | * side. | |
994 | * | |
995 | * Currently we recognize: | |
996 | * | |
d8b5e42c | 997 | * Terminal type is |
affdaa4e GM |
998 | */ |
999 | ||
1000 | suboption() | |
1001 | { | |
d8b5e42c GM |
1002 | switch (SB_GET()) { |
1003 | case TELOPT_TTYPE: { /* Yaaaay! */ | |
1004 | static char terminalname[5+41] = "TERM="; | |
1005 | ||
1006 | settimer(ttypesubopt); | |
1007 | ||
1008 | if (SB_GET() != TELQUAL_IS) { | |
1009 | return; /* ??? XXX but, this is the most robust */ | |
1010 | } | |
1011 | ||
1012 | terminaltype = terminalname+strlen(terminalname); | |
1013 | ||
1014 | while ((terminaltype < (terminalname + sizeof terminalname-1)) && | |
1015 | !SB_EOF()) { | |
1016 | register int c; | |
1017 | ||
1018 | c = SB_GET(); | |
1019 | if (isupper(c)) { | |
1020 | c = tolower(c); | |
1021 | } | |
1022 | *terminaltype++ = c; /* accumulate name */ | |
1023 | } | |
1024 | *terminaltype = 0; | |
1025 | terminaltype = terminalname; | |
1026 | break; | |
1027 | } | |
1028 | ||
affdaa4e GM |
1029 | default: |
1030 | ; | |
1031 | } | |
1032 | } | |
1033 | ||
66b878f6 BJ |
1034 | mode(on, off) |
1035 | int on, off; | |
1036 | { | |
1037 | struct sgttyb b; | |
1038 | ||
1039 | ptyflush(); | |
1040 | ioctl(pty, TIOCGETP, &b); | |
1041 | b.sg_flags |= on; | |
1042 | b.sg_flags &= ~off; | |
1043 | ioctl(pty, TIOCSETP, &b); | |
1044 | } | |
1045 | ||
1046 | /* | |
1047 | * Send interrupt to process on other side of pty. | |
1048 | * If it is in raw mode, just write NULL; | |
1049 | * otherwise, write intr char. | |
1050 | */ | |
1051 | interrupt() | |
1052 | { | |
1053 | struct sgttyb b; | |
1054 | struct tchars tchars; | |
1055 | ||
1056 | ptyflush(); /* half-hearted */ | |
1057 | ioctl(pty, TIOCGETP, &b); | |
1058 | if (b.sg_flags & RAW) { | |
1059 | *pfrontp++ = '\0'; | |
1060 | return; | |
1061 | } | |
1062 | *pfrontp++ = ioctl(pty, TIOCGETC, &tchars) < 0 ? | |
1063 | '\177' : tchars.t_intrc; | |
1064 | } | |
1065 | ||
a65453b7 GM |
1066 | /* |
1067 | * Send quit to process on other side of pty. | |
1068 | * If it is in raw mode, just write NULL; | |
1069 | * otherwise, write quit char. | |
1070 | */ | |
1071 | sendbrk() | |
1072 | { | |
1073 | struct sgttyb b; | |
1074 | struct tchars tchars; | |
1075 | ||
1076 | ptyflush(); /* half-hearted */ | |
1077 | ioctl(pty, TIOCGETP, &b); | |
1078 | if (b.sg_flags & RAW) { | |
1079 | *pfrontp++ = '\0'; | |
1080 | return; | |
1081 | } | |
1082 | *pfrontp++ = ioctl(pty, TIOCGETC, &tchars) < 0 ? | |
1083 | '\034' : tchars.t_quitc; | |
1084 | } | |
1085 | ||
66b878f6 BJ |
1086 | ptyflush() |
1087 | { | |
1088 | int n; | |
1089 | ||
1090 | if ((n = pfrontp - pbackp) > 0) | |
1091 | n = write(pty, pbackp, n); | |
9f005877 SL |
1092 | if (n < 0) |
1093 | return; | |
66b878f6 BJ |
1094 | pbackp += n; |
1095 | if (pbackp == pfrontp) | |
1096 | pbackp = pfrontp = ptyobuf; | |
1097 | } | |
615dc3cd GM |
1098 | \f |
1099 | /* | |
1100 | * nextitem() | |
1101 | * | |
1102 | * Return the address of the next "item" in the TELNET data | |
1103 | * stream. This will be the address of the next character if | |
1104 | * the current address is a user data character, or it will | |
1105 | * be the address of the character following the TELNET command | |
1106 | * if the current address is a TELNET IAC ("I Am a Command") | |
1107 | * character. | |
1108 | */ | |
66b878f6 | 1109 | |
615dc3cd GM |
1110 | char * |
1111 | nextitem(current) | |
1112 | char *current; | |
66b878f6 | 1113 | { |
615dc3cd GM |
1114 | if ((*current&0xff) != IAC) { |
1115 | return current+1; | |
1116 | } | |
1117 | switch (*(current+1)&0xff) { | |
1118 | case DO: | |
1119 | case DONT: | |
1120 | case WILL: | |
1121 | case WONT: | |
1122 | return current+3; | |
1123 | case SB: /* loop forever looking for the SE */ | |
1124 | { | |
1125 | register char *look = current+2; | |
66b878f6 | 1126 | |
615dc3cd GM |
1127 | for (;;) { |
1128 | if ((*look++&0xff) == IAC) { | |
1129 | if ((*look++&0xff) == SE) { | |
1130 | return look; | |
1131 | } | |
1132 | } | |
1133 | } | |
9f005877 | 1134 | } |
615dc3cd GM |
1135 | default: |
1136 | return current+2; | |
1137 | } | |
66b878f6 | 1138 | } |
5d78ef73 GM |
1139 | |
1140 | ||
615dc3cd GM |
1141 | /* |
1142 | * netclear() | |
1143 | * | |
1144 | * We are about to do a TELNET SYNCH operation. Clear | |
1145 | * the path to the network. | |
1146 | * | |
1147 | * Things are a bit tricky since we may have sent the first | |
1148 | * byte or so of a previous TELNET command into the network. | |
1149 | * So, we have to scan the network buffer from the beginning | |
1150 | * until we are up to where we want to be. | |
1151 | * | |
1152 | * A side effect of what we do, just to keep things | |
1153 | * simple, is to clear the urgent data pointer. The principal | |
1154 | * caller should be setting the urgent data pointer AFTER calling | |
1155 | * us in any case. | |
1156 | */ | |
1157 | ||
1158 | netclear() | |
1159 | { | |
1160 | register char *thisitem, *next; | |
1161 | char *good; | |
1162 | #define wewant(p) ((nfrontp > p) && ((*p&0xff) == IAC) && \ | |
1163 | ((*(p+1)&0xff) != EC) && ((*(p+1)&0xff) != EL)) | |
1164 | ||
1165 | thisitem = netobuf; | |
1166 | ||
1167 | while ((next = nextitem(thisitem)) <= nbackp) { | |
1168 | thisitem = next; | |
1169 | } | |
1170 | ||
1171 | /* Now, thisitem is first before/at boundary. */ | |
1172 | ||
1173 | good = netobuf; /* where the good bytes go */ | |
1174 | ||
1175 | while (nfrontp > thisitem) { | |
1176 | if (wewant(thisitem)) { | |
1177 | int length; | |
1178 | ||
1179 | next = thisitem; | |
1180 | do { | |
1181 | next = nextitem(next); | |
1182 | } while (wewant(next) && (nfrontp > next)); | |
1183 | length = next-thisitem; | |
1184 | bcopy(thisitem, good, length); | |
1185 | good += length; | |
1186 | thisitem = next; | |
1187 | } else { | |
1188 | thisitem = nextitem(thisitem); | |
1189 | } | |
1190 | } | |
1191 | ||
1192 | nbackp = netobuf; | |
1193 | nfrontp = good; /* next byte to be sent */ | |
1194 | neturg = 0; | |
1195 | } | |
1196 | \f | |
5d78ef73 GM |
1197 | /* |
1198 | * netflush | |
1199 | * Send as much data as possible to the network, | |
1200 | * handling requests for urgent data. | |
1201 | */ | |
1202 | ||
1203 | ||
1204 | netflush() | |
1205 | { | |
1206 | int n; | |
1207 | ||
1208 | if ((n = nfrontp - nbackp) > 0) { | |
affdaa4e GM |
1209 | /* |
1210 | * if no urgent data, or if the other side appears to be an | |
1211 | * old 4.2 client (and thus unable to survive TCP urgent data), | |
1212 | * write the entire buffer in non-OOB mode. | |
1213 | */ | |
1214 | if ((neturg == 0) || (not42 == 0)) { | |
5d78ef73 GM |
1215 | n = write(net, nbackp, n); /* normal write */ |
1216 | } else { | |
1217 | n = neturg - nbackp; | |
1218 | /* | |
1219 | * In 4.2 (and 4.3) systems, there is some question about | |
1220 | * what byte in a sendOOB operation is the "OOB" data. | |
1221 | * To make ourselves compatible, we only send ONE byte | |
1222 | * out of band, the one WE THINK should be OOB (though | |
1223 | * we really have more the TCP philosophy of urgent data | |
1224 | * rather than the Unix philosophy of OOB data). | |
1225 | */ | |
1226 | if (n > 1) { | |
1227 | n = send(net, nbackp, n-1, 0); /* send URGENT all by itself */ | |
1228 | } else { | |
1229 | n = send(net, nbackp, n, MSG_OOB); /* URGENT data */ | |
1230 | } | |
1231 | } | |
1232 | } | |
1233 | if (n < 0) { | |
1234 | if (errno == EWOULDBLOCK) | |
1235 | return; | |
1236 | /* should blow this guy away... */ | |
1237 | return; | |
1238 | } | |
1239 | nbackp += n; | |
1240 | if (nbackp >= neturg) { | |
1241 | neturg = 0; | |
1242 | } | |
1243 | if (nbackp == nfrontp) { | |
1244 | nbackp = nfrontp = netobuf; | |
1245 | } | |
1246 | } | |
66b878f6 BJ |
1247 | |
1248 | cleanup() | |
1249 | { | |
66b878f6 BJ |
1250 | |
1251 | rmut(); | |
a7f6263e | 1252 | vhangup(); /* XXX */ |
ff24c640 | 1253 | shutdown(net, 2); |
66b878f6 BJ |
1254 | exit(1); |
1255 | } | |
1256 | ||
1257 | #include <utmp.h> | |
1258 | ||
1259 | struct utmp wtmp; | |
1260 | char wtmpf[] = "/usr/adm/wtmp"; | |
122f5efc JB |
1261 | char utmpf[] = "/etc/utmp"; |
1262 | #define SCPYN(a, b) strncpy(a, b, sizeof(a)) | |
1263 | #define SCMPN(a, b) strncmp(a, b, sizeof(a)) | |
66b878f6 BJ |
1264 | |
1265 | rmut() | |
1266 | { | |
1267 | register f; | |
1268 | int found = 0; | |
122f5efc JB |
1269 | struct utmp *u, *utmp; |
1270 | int nutmp; | |
1271 | struct stat statbf; | |
66b878f6 | 1272 | |
122f5efc | 1273 | f = open(utmpf, O_RDWR); |
66b878f6 | 1274 | if (f >= 0) { |
122f5efc JB |
1275 | fstat(f, &statbf); |
1276 | utmp = (struct utmp *)malloc(statbf.st_size); | |
1277 | if (!utmp) | |
1278 | syslog(LOG_ERR, "utmp malloc failed"); | |
1279 | if (statbf.st_size && utmp) { | |
1280 | nutmp = read(f, utmp, statbf.st_size); | |
1281 | nutmp /= sizeof(struct utmp); | |
1282 | ||
1283 | for (u = utmp ; u < &utmp[nutmp] ; u++) { | |
1284 | if (SCMPN(u->ut_line, line+5) || | |
1285 | u->ut_name[0]==0) | |
1286 | continue; | |
1287 | lseek(f, ((long)u)-((long)utmp), L_SET); | |
1288 | SCPYN(u->ut_name, ""); | |
1289 | SCPYN(u->ut_host, ""); | |
1290 | time(&u->ut_time); | |
1291 | write(f, (char *)u, sizeof(wtmp)); | |
1292 | found++; | |
1293 | } | |
66b878f6 BJ |
1294 | } |
1295 | close(f); | |
1296 | } | |
1297 | if (found) { | |
1a33b848 | 1298 | f = open(wtmpf, O_WRONLY|O_APPEND); |
66b878f6 BJ |
1299 | if (f >= 0) { |
1300 | SCPYN(wtmp.ut_line, line+5); | |
1301 | SCPYN(wtmp.ut_name, ""); | |
37c640e2 | 1302 | SCPYN(wtmp.ut_host, ""); |
66b878f6 | 1303 | time(&wtmp.ut_time); |
122f5efc | 1304 | write(f, (char *)&wtmp, sizeof(wtmp)); |
66b878f6 BJ |
1305 | close(f); |
1306 | } | |
1307 | } | |
1308 | chmod(line, 0666); | |
1309 | chown(line, 0, 0); | |
1310 | line[strlen("/dev/")] = 'p'; | |
1311 | chmod(line, 0666); | |
1312 | chown(line, 0, 0); | |
1313 | } | |
d0a64c71 GM |
1314 | |
1315 | char editedhost[32]; | |
1316 | ||
1317 | edithost(pat, host) | |
1318 | register char *pat; | |
1319 | register char *host; | |
1320 | { | |
1321 | register char *res = editedhost; | |
1322 | ||
1323 | if (!pat) | |
1324 | pat = ""; | |
1325 | while (*pat) { | |
1326 | switch (*pat) { | |
1327 | ||
1328 | case '#': | |
1329 | if (*host) | |
1330 | host++; | |
1331 | break; | |
1332 | ||
1333 | case '@': | |
1334 | if (*host) | |
1335 | *res++ = *host++; | |
1336 | break; | |
1337 | ||
1338 | default: | |
1339 | *res++ = *pat; | |
1340 | break; | |
1341 | ||
1342 | } | |
1343 | if (res == &editedhost[sizeof editedhost - 1]) { | |
1344 | *res = '\0'; | |
1345 | return; | |
1346 | } | |
1347 | pat++; | |
1348 | } | |
1349 | if (*host) | |
1350 | strncpy(res, host, sizeof editedhost - (res - editedhost) - 1); | |
1351 | else | |
1352 | *res = '\0'; | |
1353 | editedhost[sizeof editedhost - 1] = '\0'; | |
1354 | } | |
1355 | ||
1356 | static char *putlocation; | |
1357 | ||
1358 | puts(s) | |
1359 | register char *s; | |
1360 | { | |
1361 | ||
1362 | while (*s) | |
1363 | putchr(*s++); | |
1364 | } | |
1365 | ||
1366 | putchr(cc) | |
1367 | { | |
1368 | *putlocation++ = cc; | |
1369 | } | |
1370 | ||
1371 | putf(cp, where, tty) | |
1372 | register char *cp; | |
1373 | char *where; | |
1374 | int tty; | |
1375 | { | |
1376 | char *slash; | |
1377 | char datebuffer[60]; | |
1378 | extern char *rindex(); | |
1379 | ||
1380 | putlocation = where; | |
1381 | ||
1382 | while (*cp) { | |
1383 | if (*cp != '%') { | |
1384 | putchr(*cp++); | |
1385 | continue; | |
1386 | } | |
1387 | switch (*++cp) { | |
1388 | ||
1389 | case 't': | |
1390 | slash = rindex(line, '/'); | |
1391 | if (slash == (char *) 0) | |
1392 | puts(line); | |
1393 | else | |
1394 | puts(&slash[1]); | |
1395 | break; | |
1396 | ||
1397 | case 'h': | |
1398 | puts(editedhost); | |
1399 | break; | |
1400 | ||
1401 | case 'd': | |
1402 | get_date(datebuffer); | |
1403 | puts(datebuffer); | |
1404 | break; | |
1405 | ||
1406 | case '%': | |
1407 | putchr('%'); | |
1408 | break; | |
1409 | } | |
1410 | cp++; | |
1411 | } | |
1412 | } |