Commit | Line | Data |
---|---|---|
ac6e6727 | 1 | #ifndef lint |
4898c5bf | 2 | static char sccsid[] = "@(#)telnetd.c 4.24 (Berkeley) 83/07/06"; |
ac6e6727 BJ |
3 | #endif |
4 | ||
66b878f6 BJ |
5 | /* |
6 | * Stripped-down telnet server. | |
7 | */ | |
de3b21e8 SL |
8 | #include <sys/types.h> |
9 | #include <sys/socket.h> | |
ce4fd43b | 10 | #include <sys/wait.h> |
de3b21e8 SL |
11 | |
12 | #include <netinet/in.h> | |
13 | ||
2b597a6b SL |
14 | #include <arpa/telnet.h> |
15 | ||
66b878f6 BJ |
16 | #include <stdio.h> |
17 | #include <signal.h> | |
18 | #include <errno.h> | |
19 | #include <sgtty.h> | |
9f005877 | 20 | #include <netdb.h> |
de3b21e8 | 21 | |
4898c5bf SL |
22 | #define BELL '\07' |
23 | #define BANNER "\r\n\r\n4.2 BSD UNIX (%s)\r\n\r\r\n\r%s" | |
66b878f6 BJ |
24 | |
25 | char hisopts[256]; | |
26 | char myopts[256]; | |
27 | ||
28 | char doopt[] = { IAC, DO, '%', 'c', 0 }; | |
29 | char dont[] = { IAC, DONT, '%', 'c', 0 }; | |
30 | char will[] = { IAC, WILL, '%', 'c', 0 }; | |
31 | char wont[] = { IAC, WONT, '%', 'c', 0 }; | |
32 | ||
33 | /* | |
34 | * I/O data buffers, pointers, and counters. | |
35 | */ | |
36 | char ptyibuf[BUFSIZ], *ptyip = ptyibuf; | |
37 | char ptyobuf[BUFSIZ], *pfrontp = ptyobuf, *pbackp = ptyobuf; | |
38 | char netibuf[BUFSIZ], *netip = netibuf; | |
9ef3087d | 39 | char netobuf[BUFSIZ], *nfrontp = netobuf, *nbackp = netobuf; |
66b878f6 BJ |
40 | int pcc, ncc; |
41 | ||
42 | int pty, net; | |
43 | int inter; | |
f553aca8 | 44 | int reapchild(); |
66b878f6 BJ |
45 | extern int errno; |
46 | char line[] = "/dev/ptyp0"; | |
47 | ||
9f005877 | 48 | struct sockaddr_in sin = { AF_INET }; |
66b878f6 BJ |
49 | |
50 | main(argc, argv) | |
51 | char *argv[]; | |
52 | { | |
f553aca8 | 53 | int s, pid, options; |
9f005877 | 54 | struct servent *sp; |
66b878f6 | 55 | |
9f005877 SL |
56 | sp = getservbyname("telnet", "tcp"); |
57 | if (sp == 0) { | |
58 | fprintf(stderr, "telnetd: tcp/telnet: unknown service\n"); | |
59 | exit(1); | |
60 | } | |
61 | sin.sin_port = sp->s_port; | |
66b878f6 | 62 | argc--, argv++; |
f553aca8 SL |
63 | if (argc > 0 && !strcmp(*argv, "-d")) { |
64 | options |= SO_DEBUG; | |
65 | argc--, argv++; | |
66 | } | |
9f005877 SL |
67 | if (argc > 0) { |
68 | sin.sin_port = atoi(*argv); | |
69 | if (sin.sin_port <= 0) { | |
70 | fprintf(stderr, "telnetd: %s: bad port #\n", *argv); | |
71 | exit(1); | |
72 | } | |
5eba30a3 | 73 | sin.sin_port = htons((u_short)sin.sin_port); |
9f005877 | 74 | } |
16f092bf SL |
75 | #ifndef DEBUG |
76 | if (fork()) | |
77 | exit(0); | |
78 | for (s = 0; s < 10; s++) | |
79 | (void) close(s); | |
80 | (void) open("/", 0); | |
81 | (void) dup2(0, 1); | |
82 | (void) dup2(0, 2); | |
83 | { int tt = open("/dev/tty", 2); | |
84 | if (tt > 0) { | |
85 | ioctl(tt, TIOCNOTTY, 0); | |
86 | close(tt); | |
87 | } | |
88 | } | |
89 | #endif | |
de3b21e8 | 90 | again: |
9de2cbb6 | 91 | s = socket(AF_INET, SOCK_STREAM, 0, 0); |
de3b21e8 SL |
92 | if (s < 0) { |
93 | perror("telnetd: socket");; | |
94 | sleep(5); | |
95 | goto again; | |
96 | } | |
f553aca8 SL |
97 | if (options & SO_DEBUG) |
98 | if (setsockopt(s, SOL_SOCKET, SO_DEBUG, 0, 0) < 0) | |
99 | perror("telnetd: setsockopt (SO_DEBUG)"); | |
f553aca8 SL |
100 | if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 0, 0) < 0) |
101 | perror("telnetd: setsockopt (SO_KEEPALIVE)"); | |
de3b21e8 SL |
102 | while (bind(s, (caddr_t)&sin, sizeof (sin), 0) < 0) { |
103 | perror("telnetd: bind"); | |
104 | sleep(5); | |
105 | } | |
8a53982e | 106 | signal(SIGCHLD, reapchild); |
de3b21e8 | 107 | listen(s, 10); |
66b878f6 | 108 | for (;;) { |
37c640e2 SL |
109 | struct sockaddr_in from; |
110 | int s2, fromlen = sizeof (from); | |
de3b21e8 | 111 | |
37c640e2 | 112 | s2 = accept(s, (caddr_t)&from, &fromlen); |
de3b21e8 | 113 | if (s2 < 0) { |
f553aca8 SL |
114 | if (errno == EINTR) |
115 | continue; | |
8f2758db | 116 | perror("telnetd: accept"); |
66b878f6 BJ |
117 | sleep(1); |
118 | continue; | |
119 | } | |
120 | if ((pid = fork()) < 0) | |
121 | printf("Out of processes\n"); | |
d05f347d SL |
122 | else if (pid == 0) { |
123 | signal(SIGCHLD, SIG_IGN); | |
37c640e2 | 124 | doit(s2, &from); |
d05f347d | 125 | } |
de3b21e8 | 126 | close(s2); |
66b878f6 BJ |
127 | } |
128 | /*NOTREACHED*/ | |
129 | } | |
130 | ||
f553aca8 SL |
131 | reapchild() |
132 | { | |
133 | union wait status; | |
134 | ||
135 | while (wait3(&status, WNOHANG, 0) > 0) | |
136 | ; | |
137 | } | |
138 | ||
66b878f6 BJ |
139 | int cleanup(); |
140 | ||
141 | /* | |
142 | * Get a pty, scan input lines. | |
143 | */ | |
37c640e2 SL |
144 | doit(f, who) |
145 | int f; | |
146 | struct sockaddr_in *who; | |
66b878f6 | 147 | { |
37c640e2 | 148 | char *cp = line, *host, *ntoa(); |
66b878f6 BJ |
149 | int i, p, cc, t; |
150 | struct sgttyb b; | |
37c640e2 | 151 | struct hostent *hp; |
66b878f6 BJ |
152 | |
153 | for (i = 0; i < 16; i++) { | |
154 | cp[strlen("/dev/ptyp")] = "0123456789abcdef"[i]; | |
155 | p = open(cp, 2); | |
156 | if (p > 0) | |
157 | goto gotpty; | |
158 | } | |
8f2758db SL |
159 | fatal(f, "All network ports in use"); |
160 | /*NOTREACHED*/ | |
66b878f6 BJ |
161 | gotpty: |
162 | dup2(f, 0); | |
163 | cp[strlen("/dev/")] = 't'; | |
164 | t = open("/dev/tty", 2); | |
165 | if (t >= 0) { | |
166 | ioctl(t, TIOCNOTTY, 0); | |
167 | close(t); | |
168 | } | |
169 | t = open(cp, 2); | |
8f2758db SL |
170 | if (t < 0) |
171 | fatalperror(f, cp, errno); | |
66b878f6 | 172 | ioctl(t, TIOCGETP, &b); |
9ef3087d | 173 | b.sg_flags = CRMOD|XTABS|ANYP; |
66b878f6 | 174 | ioctl(t, TIOCSETP, &b); |
9ef3087d | 175 | ioctl(p, TIOCGETP, &b); |
da96b661 | 176 | b.sg_flags &= ~ECHO; |
9ef3087d | 177 | ioctl(p, TIOCSETP, &b); |
37c640e2 SL |
178 | hp = gethostbyaddr(&who->sin_addr, sizeof (struct in_addr), |
179 | who->sin_family); | |
180 | if (hp) | |
181 | host = hp->h_name; | |
182 | else | |
183 | host = ntoa(who->sin_addr); | |
8f2758db SL |
184 | if ((i = fork()) < 0) |
185 | fatalperror(f, "fork", errno); | |
66b878f6 BJ |
186 | if (i) |
187 | telnet(f, p); | |
188 | close(f); | |
189 | close(p); | |
190 | dup2(t, 0); | |
191 | dup2(t, 1); | |
192 | dup2(t, 2); | |
193 | close(t); | |
0c285f22 | 194 | execl("/bin/login", "login", "-h", host, 0); |
8f2758db SL |
195 | fatalperror(f, "/bin/login", errno); |
196 | /*NOTREACHED*/ | |
197 | } | |
198 | ||
199 | fatal(f, msg) | |
200 | int f; | |
201 | char *msg; | |
202 | { | |
203 | char buf[BUFSIZ]; | |
204 | ||
205 | (void) sprintf(buf, "telnetd: %s.\n", msg); | |
206 | (void) write(f, buf, strlen(buf)); | |
66b878f6 BJ |
207 | exit(1); |
208 | } | |
209 | ||
8f2758db SL |
210 | fatalperror(f, msg, errno) |
211 | int f; | |
212 | char *msg; | |
213 | int errno; | |
214 | { | |
215 | char buf[BUFSIZ]; | |
216 | extern char *sys_errlist[]; | |
217 | ||
218 | (void) sprintf(buf, "%s: %s", msg, sys_errlist[errno]); | |
219 | fatal(f, buf); | |
220 | } | |
221 | ||
66b878f6 BJ |
222 | /* |
223 | * Main loop. Select from pty and network, and | |
224 | * hand data to telnet receiver finite state machine. | |
225 | */ | |
226 | telnet(f, p) | |
227 | { | |
228 | int on = 1; | |
0c285f22 | 229 | char hostname[32]; |
66b878f6 BJ |
230 | |
231 | net = f, pty = p; | |
232 | ioctl(f, FIONBIO, &on); | |
233 | ioctl(p, FIONBIO, &on); | |
234 | signal(SIGTSTP, SIG_IGN); | |
8a53982e | 235 | signal(SIGCHLD, cleanup); |
66b878f6 | 236 | |
da96b661 SL |
237 | /* |
238 | * Request to do remote echo. | |
239 | */ | |
240 | dooption(TELOPT_ECHO); | |
241 | myopts[TELOPT_ECHO] = 1; | |
0c285f22 SL |
242 | /* |
243 | * Show banner that getty never gave. | |
244 | */ | |
245 | gethostname(hostname, sizeof (hostname)); | |
246 | sprintf(nfrontp, BANNER, hostname, ""); | |
247 | nfrontp += strlen(nfrontp); | |
66b878f6 BJ |
248 | for (;;) { |
249 | int ibits = 0, obits = 0; | |
250 | register int c; | |
251 | ||
252 | /* | |
253 | * Never look for input if there's still | |
254 | * stuff in the corresponding output buffer | |
255 | */ | |
256 | if (nfrontp - nbackp) | |
257 | obits |= (1 << f); | |
258 | else | |
259 | ibits |= (1 << p); | |
260 | if (pfrontp - pbackp) | |
261 | obits |= (1 << p); | |
262 | else | |
263 | ibits |= (1 << f); | |
264 | if (ncc < 0 && pcc < 0) | |
265 | break; | |
de3b21e8 | 266 | select(16, &ibits, &obits, 0, 0); |
66b878f6 BJ |
267 | if (ibits == 0 && obits == 0) { |
268 | sleep(5); | |
269 | continue; | |
270 | } | |
271 | ||
272 | /* | |
273 | * Something to read from the network... | |
274 | */ | |
275 | if (ibits & (1 << f)) { | |
276 | ncc = read(f, netibuf, BUFSIZ); | |
277 | if (ncc < 0 && errno == EWOULDBLOCK) | |
278 | ncc = 0; | |
279 | else { | |
280 | if (ncc <= 0) | |
281 | break; | |
282 | netip = netibuf; | |
283 | } | |
284 | } | |
285 | ||
286 | /* | |
287 | * Something to read from the pty... | |
288 | */ | |
289 | if (ibits & (1 << p)) { | |
290 | pcc = read(p, ptyibuf, BUFSIZ); | |
291 | if (pcc < 0 && errno == EWOULDBLOCK) | |
292 | pcc = 0; | |
293 | else { | |
294 | if (pcc <= 0) | |
295 | break; | |
296 | ptyip = ptyibuf; | |
297 | } | |
298 | } | |
299 | ||
300 | while (pcc > 0) { | |
301 | if ((&netobuf[BUFSIZ] - nfrontp) < 2) | |
302 | break; | |
303 | c = *ptyip++ & 0377, pcc--; | |
304 | if (c == IAC) | |
305 | *nfrontp++ = c; | |
306 | *nfrontp++ = c; | |
307 | } | |
308 | if ((obits & (1 << f)) && (nfrontp - nbackp) > 0) | |
309 | netflush(); | |
310 | if (ncc > 0) | |
311 | telrcv(); | |
312 | if ((obits & (1 << p)) && (pfrontp - pbackp) > 0) | |
313 | ptyflush(); | |
314 | } | |
315 | cleanup(); | |
316 | } | |
317 | ||
318 | /* | |
319 | * State for recv fsm | |
320 | */ | |
321 | #define TS_DATA 0 /* base state */ | |
322 | #define TS_IAC 1 /* look for double IAC's */ | |
323 | #define TS_CR 2 /* CR-LF ->'s CR */ | |
324 | #define TS_BEGINNEG 3 /* throw away begin's... */ | |
325 | #define TS_ENDNEG 4 /* ...end's (suboption negotiation) */ | |
326 | #define TS_WILL 5 /* will option negotiation */ | |
327 | #define TS_WONT 6 /* wont " */ | |
328 | #define TS_DO 7 /* do " */ | |
329 | #define TS_DONT 8 /* dont " */ | |
330 | ||
331 | telrcv() | |
332 | { | |
333 | register int c; | |
334 | static int state = TS_DATA; | |
335 | struct sgttyb b; | |
336 | ||
337 | while (ncc > 0) { | |
338 | if ((&ptyobuf[BUFSIZ] - pfrontp) < 2) | |
339 | return; | |
340 | c = *netip++ & 0377, ncc--; | |
341 | switch (state) { | |
342 | ||
343 | case TS_DATA: | |
344 | if (c == IAC) { | |
345 | state = TS_IAC; | |
346 | break; | |
347 | } | |
348 | if (inter > 0) | |
349 | break; | |
350 | *pfrontp++ = c; | |
351 | if (!myopts[TELOPT_BINARY] && c == '\r') | |
352 | state = TS_CR; | |
353 | break; | |
354 | ||
355 | case TS_CR: | |
356 | if (c && c != '\n') | |
357 | *pfrontp++ = c; | |
358 | state = TS_DATA; | |
359 | break; | |
360 | ||
361 | case TS_IAC: | |
362 | switch (c) { | |
363 | ||
364 | /* | |
365 | * Send the process on the pty side an | |
366 | * interrupt. Do this with a NULL or | |
367 | * interrupt char; depending on the tty mode. | |
368 | */ | |
369 | case BREAK: | |
370 | case IP: | |
371 | interrupt(); | |
372 | break; | |
373 | ||
374 | /* | |
375 | * Are You There? | |
376 | */ | |
377 | case AYT: | |
378 | *pfrontp++ = BELL; | |
379 | break; | |
380 | ||
381 | /* | |
382 | * Erase Character and | |
383 | * Erase Line | |
384 | */ | |
385 | case EC: | |
386 | case EL: | |
387 | ptyflush(); /* half-hearted */ | |
388 | ioctl(pty, TIOCGETP, &b); | |
389 | *pfrontp++ = (c == EC) ? | |
390 | b.sg_erase : b.sg_kill; | |
391 | break; | |
392 | ||
393 | /* | |
394 | * Check for urgent data... | |
395 | */ | |
396 | case DM: | |
397 | break; | |
398 | ||
399 | /* | |
400 | * Begin option subnegotiation... | |
401 | */ | |
402 | case SB: | |
403 | state = TS_BEGINNEG; | |
404 | continue; | |
405 | ||
406 | case WILL: | |
407 | case WONT: | |
408 | case DO: | |
409 | case DONT: | |
410 | state = TS_WILL + (c - WILL); | |
411 | continue; | |
412 | ||
413 | case IAC: | |
414 | *pfrontp++ = c; | |
415 | break; | |
416 | } | |
417 | state = TS_DATA; | |
418 | break; | |
419 | ||
420 | case TS_BEGINNEG: | |
421 | if (c == IAC) | |
422 | state = TS_ENDNEG; | |
423 | break; | |
424 | ||
425 | case TS_ENDNEG: | |
426 | state = c == SE ? TS_DATA : TS_BEGINNEG; | |
427 | break; | |
428 | ||
429 | case TS_WILL: | |
430 | if (!hisopts[c]) | |
431 | willoption(c); | |
432 | state = TS_DATA; | |
433 | continue; | |
434 | ||
435 | case TS_WONT: | |
436 | if (hisopts[c]) | |
437 | wontoption(c); | |
438 | state = TS_DATA; | |
439 | continue; | |
440 | ||
441 | case TS_DO: | |
442 | if (!myopts[c]) | |
443 | dooption(c); | |
444 | state = TS_DATA; | |
445 | continue; | |
446 | ||
447 | case TS_DONT: | |
448 | if (myopts[c]) { | |
449 | myopts[c] = 0; | |
450 | sprintf(nfrontp, wont, c); | |
da96b661 | 451 | nfrontp += sizeof (wont) - 2; |
66b878f6 BJ |
452 | } |
453 | state = TS_DATA; | |
454 | continue; | |
455 | ||
456 | default: | |
de3b21e8 | 457 | printf("telnetd: panic state=%d\n", state); |
66b878f6 BJ |
458 | exit(1); |
459 | } | |
460 | } | |
461 | } | |
462 | ||
463 | willoption(option) | |
464 | int option; | |
465 | { | |
466 | char *fmt; | |
467 | ||
468 | switch (option) { | |
469 | ||
470 | case TELOPT_BINARY: | |
471 | mode(RAW, 0); | |
472 | goto common; | |
473 | ||
474 | case TELOPT_ECHO: | |
475 | mode(0, ECHO|CRMOD); | |
476 | /*FALL THRU*/ | |
477 | ||
478 | case TELOPT_SGA: | |
479 | common: | |
480 | hisopts[option] = 1; | |
481 | fmt = doopt; | |
482 | break; | |
483 | ||
484 | case TELOPT_TM: | |
485 | fmt = dont; | |
486 | break; | |
487 | ||
488 | default: | |
489 | fmt = dont; | |
490 | break; | |
491 | } | |
13646f15 | 492 | sprintf(nfrontp, fmt, option); |
da96b661 | 493 | nfrontp += sizeof (dont) - 2; |
66b878f6 BJ |
494 | } |
495 | ||
496 | wontoption(option) | |
497 | int option; | |
498 | { | |
499 | char *fmt; | |
500 | ||
501 | switch (option) { | |
502 | ||
503 | case TELOPT_ECHO: | |
504 | mode(ECHO|CRMOD, 0); | |
505 | goto common; | |
506 | ||
507 | case TELOPT_BINARY: | |
508 | mode(0, RAW); | |
509 | /*FALL THRU*/ | |
510 | ||
511 | case TELOPT_SGA: | |
512 | common: | |
513 | hisopts[option] = 0; | |
514 | fmt = dont; | |
515 | break; | |
516 | ||
517 | default: | |
518 | fmt = dont; | |
519 | } | |
520 | sprintf(nfrontp, fmt, option); | |
da96b661 | 521 | nfrontp += sizeof (doopt) - 2; |
66b878f6 BJ |
522 | } |
523 | ||
524 | dooption(option) | |
525 | int option; | |
526 | { | |
527 | char *fmt; | |
528 | ||
529 | switch (option) { | |
530 | ||
531 | case TELOPT_TM: | |
532 | fmt = wont; | |
533 | break; | |
534 | ||
535 | case TELOPT_ECHO: | |
536 | mode(ECHO|CRMOD, 0); | |
537 | goto common; | |
538 | ||
539 | case TELOPT_BINARY: | |
540 | mode(RAW, 0); | |
541 | /*FALL THRU*/ | |
542 | ||
543 | case TELOPT_SGA: | |
544 | common: | |
545 | fmt = will; | |
546 | break; | |
547 | ||
548 | default: | |
549 | fmt = wont; | |
550 | break; | |
551 | } | |
552 | sprintf(nfrontp, fmt, option); | |
da96b661 | 553 | nfrontp += sizeof (doopt) - 2; |
66b878f6 BJ |
554 | } |
555 | ||
556 | mode(on, off) | |
557 | int on, off; | |
558 | { | |
559 | struct sgttyb b; | |
560 | ||
561 | ptyflush(); | |
562 | ioctl(pty, TIOCGETP, &b); | |
563 | b.sg_flags |= on; | |
564 | b.sg_flags &= ~off; | |
565 | ioctl(pty, TIOCSETP, &b); | |
566 | } | |
567 | ||
568 | /* | |
569 | * Send interrupt to process on other side of pty. | |
570 | * If it is in raw mode, just write NULL; | |
571 | * otherwise, write intr char. | |
572 | */ | |
573 | interrupt() | |
574 | { | |
575 | struct sgttyb b; | |
576 | struct tchars tchars; | |
577 | ||
578 | ptyflush(); /* half-hearted */ | |
579 | ioctl(pty, TIOCGETP, &b); | |
580 | if (b.sg_flags & RAW) { | |
581 | *pfrontp++ = '\0'; | |
582 | return; | |
583 | } | |
584 | *pfrontp++ = ioctl(pty, TIOCGETC, &tchars) < 0 ? | |
585 | '\177' : tchars.t_intrc; | |
586 | } | |
587 | ||
588 | ptyflush() | |
589 | { | |
590 | int n; | |
591 | ||
592 | if ((n = pfrontp - pbackp) > 0) | |
593 | n = write(pty, pbackp, n); | |
9f005877 SL |
594 | if (n < 0) |
595 | return; | |
66b878f6 BJ |
596 | pbackp += n; |
597 | if (pbackp == pfrontp) | |
598 | pbackp = pfrontp = ptyobuf; | |
599 | } | |
600 | ||
601 | netflush() | |
602 | { | |
603 | int n; | |
604 | ||
605 | if ((n = nfrontp - nbackp) > 0) | |
606 | n = write(net, nbackp, n); | |
9f005877 SL |
607 | if (n < 0) { |
608 | if (errno == EWOULDBLOCK) | |
609 | return; | |
610 | /* should blow this guy away... */ | |
611 | return; | |
612 | } | |
66b878f6 BJ |
613 | nbackp += n; |
614 | if (nbackp == nfrontp) | |
615 | nbackp = nfrontp = netobuf; | |
616 | } | |
617 | ||
618 | cleanup() | |
619 | { | |
66b878f6 BJ |
620 | |
621 | rmut(); | |
a7f6263e | 622 | vhangup(); /* XXX */ |
ff24c640 | 623 | shutdown(net, 2); |
66b878f6 BJ |
624 | kill(0, SIGKILL); |
625 | exit(1); | |
626 | } | |
627 | ||
628 | #include <utmp.h> | |
629 | ||
630 | struct utmp wtmp; | |
631 | char wtmpf[] = "/usr/adm/wtmp"; | |
632 | char utmp[] = "/etc/utmp"; | |
da96b661 SL |
633 | #define SCPYN(a, b) strncpy(a, b, sizeof (a)) |
634 | #define SCMPN(a, b) strncmp(a, b, sizeof (a)) | |
66b878f6 BJ |
635 | |
636 | rmut() | |
637 | { | |
638 | register f; | |
639 | int found = 0; | |
640 | ||
641 | f = open(utmp, 2); | |
642 | if (f >= 0) { | |
da96b661 | 643 | while(read(f, (char *)&wtmp, sizeof (wtmp)) == sizeof (wtmp)) { |
66b878f6 BJ |
644 | if (SCMPN(wtmp.ut_line, line+5) || wtmp.ut_name[0]==0) |
645 | continue; | |
da96b661 | 646 | lseek(f, -(long)sizeof (wtmp), 1); |
66b878f6 | 647 | SCPYN(wtmp.ut_name, ""); |
37c640e2 | 648 | SCPYN(wtmp.ut_host, ""); |
66b878f6 | 649 | time(&wtmp.ut_time); |
da96b661 | 650 | write(f, (char *)&wtmp, sizeof (wtmp)); |
66b878f6 BJ |
651 | found++; |
652 | } | |
653 | close(f); | |
654 | } | |
655 | if (found) { | |
656 | f = open(wtmpf, 1); | |
657 | if (f >= 0) { | |
658 | SCPYN(wtmp.ut_line, line+5); | |
659 | SCPYN(wtmp.ut_name, ""); | |
37c640e2 | 660 | SCPYN(wtmp.ut_host, ""); |
66b878f6 BJ |
661 | time(&wtmp.ut_time); |
662 | lseek(f, (long)0, 2); | |
da96b661 | 663 | write(f, (char *)&wtmp, sizeof (wtmp)); |
66b878f6 BJ |
664 | close(f); |
665 | } | |
666 | } | |
667 | chmod(line, 0666); | |
668 | chown(line, 0, 0); | |
669 | line[strlen("/dev/")] = 'p'; | |
670 | chmod(line, 0666); | |
671 | chown(line, 0, 0); | |
672 | } | |
37c640e2 SL |
673 | |
674 | /* | |
675 | * Convert network-format internet address | |
676 | * to base 256 d.d.d.d representation. | |
677 | */ | |
678 | char * | |
679 | ntoa(in) | |
680 | struct in_addr in; | |
681 | { | |
682 | static char b[18]; | |
683 | register char *p; | |
684 | ||
685 | p = (char *)∈ | |
686 | #define UC(b) (((int)b)&0xff) | |
687 | sprintf(b, "%d.%d.%d.%d", UC(p[0]), UC(p[1]), UC(p[2]), UC(p[3])); | |
688 | return (b); | |
689 | } |