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58364d4e WJ |
1 | /* |
2 | * Copyright (c) 1983 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #ifndef lint | |
35 | char copyright[] = | |
36 | "@(#) Copyright (c) 1983 The Regents of the University of California.\n\ | |
37 | All rights reserved.\n"; | |
38 | #endif /* not lint */ | |
39 | ||
40 | #ifndef lint | |
41 | static char sccsid[] = "@(#)tip.c 5.15 (Berkeley) 2/4/91"; | |
42 | #endif /* not lint */ | |
43 | ||
44 | /* | |
45 | * tip - UNIX link to other systems | |
46 | * tip [-v] [-speed] system-name | |
47 | * or | |
48 | * cu phone-number [-s speed] [-l line] [-a acu] | |
49 | */ | |
50 | #include "tip.h" | |
51 | #include "pathnames.h" | |
52 | ||
53 | /* | |
54 | * Baud rate mapping table | |
55 | */ | |
56 | int bauds[] = { | |
57 | 0, 50, 75, 110, 134, 150, 200, 300, 600, | |
58 | 1200, 1800, 2400, 4800, 9600, 19200, 38400, 57600, -1 | |
59 | }; | |
60 | ||
61 | int disc = OTTYDISC; /* tip normally runs this way */ | |
62 | void intprompt(); | |
63 | void timeout(); | |
64 | void cleanup(); | |
65 | char *sname(); | |
66 | char PNbuf[256]; /* This limits the size of a number */ | |
67 | ||
68 | main(argc, argv) | |
69 | char *argv[]; | |
70 | { | |
71 | char *system = NOSTR; | |
72 | register int i; | |
73 | register char *p; | |
74 | char sbuf[12]; | |
75 | ||
76 | gid = getgid(); | |
77 | egid = getegid(); | |
78 | uid = getuid(); | |
79 | euid = geteuid(); | |
80 | if (equal(sname(argv[0]), "cu")) { | |
81 | cumode = 1; | |
82 | cumain(argc, argv); | |
83 | goto cucommon; | |
84 | } | |
85 | ||
86 | if (argc > 4) { | |
87 | fprintf(stderr, "usage: tip [-v] [-speed] [system-name]\n"); | |
88 | exit(1); | |
89 | } | |
90 | if (!isatty(0)) { | |
91 | fprintf(stderr, "tip: must be interactive\n"); | |
92 | exit(1); | |
93 | } | |
94 | ||
95 | for (; argc > 1; argv++, argc--) { | |
96 | if (argv[1][0] != '-') | |
97 | system = argv[1]; | |
98 | else switch (argv[1][1]) { | |
99 | ||
100 | case 'v': | |
101 | vflag++; | |
102 | break; | |
103 | ||
104 | case '0': case '1': case '2': case '3': case '4': | |
105 | case '5': case '6': case '7': case '8': case '9': | |
106 | BR = atoi(&argv[1][1]); | |
107 | break; | |
108 | ||
109 | default: | |
110 | fprintf(stderr, "tip: %s, unknown option\n", argv[1]); | |
111 | break; | |
112 | } | |
113 | } | |
114 | ||
115 | if (system == NOSTR) | |
116 | goto notnumber; | |
117 | if (isalpha(*system)) | |
118 | goto notnumber; | |
119 | /* | |
120 | * System name is really a phone number... | |
121 | * Copy the number then stomp on the original (in case the number | |
122 | * is private, we don't want 'ps' or 'w' to find it). | |
123 | */ | |
124 | if (strlen(system) > sizeof PNbuf - 1) { | |
125 | fprintf(stderr, "tip: phone number too long (max = %d bytes)\n", | |
126 | sizeof PNbuf - 1); | |
127 | exit(1); | |
128 | } | |
129 | strncpy( PNbuf, system, sizeof PNbuf - 1 ); | |
130 | for (p = system; *p; p++) | |
131 | *p = '\0'; | |
132 | PN = PNbuf; | |
133 | (void)sprintf(sbuf, "tip%d", BR); | |
134 | system = sbuf; | |
135 | ||
136 | notnumber: | |
137 | (void)signal(SIGINT, cleanup); | |
138 | (void)signal(SIGQUIT, cleanup); | |
139 | (void)signal(SIGHUP, cleanup); | |
140 | (void)signal(SIGTERM, cleanup); | |
141 | ||
142 | if ((i = hunt(system)) == 0) { | |
143 | printf("all ports busy\n"); | |
144 | exit(3); | |
145 | } | |
146 | if (i == -1) { | |
147 | printf("link down\n"); | |
148 | (void)uu_unlock(uucplock); | |
149 | exit(3); | |
150 | } | |
151 | setbuf(stdout, NULL); | |
152 | loginit(); | |
153 | ||
154 | /* | |
155 | * Kludge, their's no easy way to get the initialization | |
156 | * in the right order, so force it here | |
157 | */ | |
158 | if ((PH = getenv("PHONES")) == NOSTR) | |
159 | PH = _PATH_PHONES; | |
160 | vinit(); /* init variables */ | |
161 | setparity("even"); /* set the parity table */ | |
162 | if ((i = speed(number(value(BAUDRATE)))) == NULL) { | |
163 | printf("tip: bad baud rate %d\n", number(value(BAUDRATE))); | |
164 | (void)uu_unlock(uucplock); | |
165 | exit(3); | |
166 | } | |
167 | ||
168 | /* | |
169 | * Now that we have the logfile and the ACU open | |
170 | * return to the real uid and gid. These things will | |
171 | * be closed on exit. Swap real and effective uid's | |
172 | * so we can get the original permissions back | |
173 | * for removing the uucp lock. | |
174 | */ | |
175 | user_uid(); | |
176 | ||
177 | /* | |
178 | * Hardwired connections require the | |
179 | * line speed set before they make any transmissions | |
180 | * (this is particularly true of things like a DF03-AC) | |
181 | */ | |
182 | if (HW) | |
183 | ttysetup(i); | |
184 | if (p = connect()) { | |
185 | printf("\07%s\n[EOT]\n", p); | |
186 | daemon_uid(); | |
187 | (void)uu_unlock(uucplock); | |
188 | exit(1); | |
189 | } | |
190 | if (!HW) | |
191 | ttysetup(i); | |
192 | cucommon: | |
193 | /* | |
194 | * From here down the code is shared with | |
195 | * the "cu" version of tip. | |
196 | */ | |
197 | ||
198 | ioctl(0, TIOCGETP, (char *)&defarg); | |
199 | ioctl(0, TIOCGETC, (char *)&defchars); | |
200 | ioctl(0, TIOCGLTC, (char *)&deflchars); | |
201 | ioctl(0, TIOCGETD, (char *)&odisc); | |
202 | arg = defarg; | |
203 | arg.sg_flags = ANYP | CBREAK; | |
204 | tchars = defchars; | |
205 | tchars.t_intrc = tchars.t_quitc = -1; | |
206 | ltchars = deflchars; | |
207 | ltchars.t_suspc = ltchars.t_dsuspc = ltchars.t_flushc | |
208 | = ltchars.t_lnextc = -1; | |
209 | raw(); | |
210 | ||
211 | pipe(fildes); pipe(repdes); | |
212 | (void)signal(SIGALRM, timeout); | |
213 | ||
214 | /* | |
215 | * Everything's set up now: | |
216 | * connection established (hardwired or dialup) | |
217 | * line conditioned (baud rate, mode, etc.) | |
218 | * internal data structures (variables) | |
219 | * so, fork one process for local side and one for remote. | |
220 | */ | |
221 | printf(cumode ? "Connected\r\n" : "\07connected\r\n"); | |
222 | if (pid = fork()) | |
223 | tipin(); | |
224 | else | |
225 | tipout(); | |
226 | /*NOTREACHED*/ | |
227 | } | |
228 | ||
229 | void | |
230 | cleanup() | |
231 | { | |
232 | ||
233 | daemon_uid(); | |
234 | (void)uu_unlock(uucplock); | |
235 | if (odisc) | |
236 | ioctl(0, TIOCSETD, (char *)&odisc); | |
237 | exit(0); | |
238 | } | |
239 | ||
240 | /* | |
241 | * Muck with user ID's. We are setuid to the owner of the lock | |
242 | * directory when we start. user_uid() reverses real and effective | |
243 | * ID's after startup, to run with the user's permissions. | |
244 | * daemon_uid() switches back to the privileged uid for unlocking. | |
245 | * Finally, to avoid running a shell with the wrong real uid, | |
246 | * shell_uid() sets real and effective uid's to the user's real ID. | |
247 | */ | |
248 | static int uidswapped; | |
249 | ||
250 | user_uid() | |
251 | { | |
252 | if (uidswapped == 0) { | |
253 | setregid(egid, gid); | |
254 | setreuid(euid, uid); | |
255 | uidswapped = 1; | |
256 | } | |
257 | } | |
258 | ||
259 | daemon_uid() | |
260 | { | |
261 | ||
262 | if (uidswapped) { | |
263 | setreuid(uid, euid); | |
264 | setregid(gid, egid); | |
265 | uidswapped = 0; | |
266 | } | |
267 | } | |
268 | ||
269 | shell_uid() | |
270 | { | |
271 | ||
272 | setreuid(uid, uid); | |
273 | setregid(gid, gid); | |
274 | } | |
275 | ||
276 | /* | |
277 | * put the controlling keyboard into raw mode | |
278 | */ | |
279 | raw() | |
280 | { | |
281 | ||
282 | ioctl(0, TIOCSETP, &arg); | |
283 | ioctl(0, TIOCSETC, &tchars); | |
284 | ioctl(0, TIOCSLTC, <chars); | |
285 | ioctl(0, TIOCSETD, (char *)&disc); | |
286 | } | |
287 | ||
288 | ||
289 | /* | |
290 | * return keyboard to normal mode | |
291 | */ | |
292 | unraw() | |
293 | { | |
294 | ||
295 | ioctl(0, TIOCSETD, (char *)&odisc); | |
296 | ioctl(0, TIOCSETP, (char *)&defarg); | |
297 | ioctl(0, TIOCSETC, (char *)&defchars); | |
298 | ioctl(0, TIOCSLTC, (char *)&deflchars); | |
299 | } | |
300 | ||
301 | static jmp_buf promptbuf; | |
302 | ||
303 | /* | |
304 | * Print string ``s'', then read a string | |
305 | * in from the terminal. Handles signals & allows use of | |
306 | * normal erase and kill characters. | |
307 | */ | |
308 | prompt(s, p) | |
309 | char *s; | |
310 | register char *p; | |
311 | { | |
312 | register char *b = p; | |
313 | sig_t oint, oquit; | |
314 | ||
315 | stoprompt = 0; | |
316 | oint = signal(SIGINT, intprompt); | |
317 | oquit = signal(SIGQUIT, SIG_IGN); | |
318 | unraw(); | |
319 | printf("%s", s); | |
320 | if (setjmp(promptbuf) == 0) | |
321 | while ((*p = getchar()) != EOF && *p != '\n') | |
322 | p++; | |
323 | *p = '\0'; | |
324 | ||
325 | raw(); | |
326 | (void)signal(SIGINT, oint); | |
327 | (void)signal(SIGQUIT, oquit); | |
328 | return (stoprompt || p == b); | |
329 | } | |
330 | ||
331 | /* | |
332 | * Interrupt service routine during prompting | |
333 | */ | |
334 | void | |
335 | intprompt() | |
336 | { | |
337 | ||
338 | (void)signal(SIGINT, SIG_IGN); | |
339 | stoprompt = 1; | |
340 | printf("\r\n"); | |
341 | longjmp(promptbuf, 1); | |
342 | } | |
343 | ||
344 | /* | |
345 | * ****TIPIN TIPIN**** | |
346 | */ | |
347 | tipin() | |
348 | { | |
349 | char gch, bol = 1; | |
350 | ||
351 | /* | |
352 | * Kinda klugey here... | |
353 | * check for scripting being turned on from the .tiprc file, | |
354 | * but be careful about just using setscript(), as we may | |
355 | * send a SIGEMT before tipout has a chance to set up catching | |
356 | * it; so wait a second, then setscript() | |
357 | */ | |
358 | if (boolean(value(SCRIPT))) { | |
359 | sleep(1); | |
360 | setscript(); | |
361 | } | |
362 | ||
363 | while (1) { | |
364 | gch = getchar()&0177; | |
365 | if ((gch == character(value(ESCAPE))) && bol) { | |
366 | if (!(gch = escape())) | |
367 | continue; | |
368 | } else if (!cumode && gch == character(value(RAISECHAR))) { | |
369 | boolean(value(RAISE)) = !boolean(value(RAISE)); | |
370 | continue; | |
371 | } else if (gch == '\r') { | |
372 | bol = 1; | |
373 | pwrite(FD, &gch, 1); | |
374 | if (boolean(value(HALFDUPLEX))) | |
375 | printf("\r\n"); | |
376 | continue; | |
377 | } else if (!cumode && gch == character(value(FORCE))) | |
378 | gch = getchar()&0177; | |
379 | bol = any(gch, value(EOL)); | |
380 | if (boolean(value(RAISE)) && islower(gch)) | |
381 | gch = toupper(gch); | |
382 | pwrite(FD, &gch, 1); | |
383 | if (boolean(value(HALFDUPLEX))) | |
384 | printf("%c", gch); | |
385 | } | |
386 | } | |
387 | ||
388 | /* | |
389 | * Escape handler -- | |
390 | * called on recognition of ``escapec'' at the beginning of a line | |
391 | */ | |
392 | escape() | |
393 | { | |
394 | register char gch; | |
395 | register esctable_t *p; | |
396 | char c = character(value(ESCAPE)); | |
397 | extern esctable_t etable[]; | |
398 | ||
399 | gch = (getchar()&0177); | |
400 | for (p = etable; p->e_char; p++) | |
401 | if (p->e_char == gch) { | |
402 | if ((p->e_flags&PRIV) && uid) | |
403 | continue; | |
404 | printf("%s", ctrl(c)); | |
405 | (*p->e_func)(gch); | |
406 | return (0); | |
407 | } | |
408 | /* ESCAPE ESCAPE forces ESCAPE */ | |
409 | if (c != gch) | |
410 | pwrite(FD, &c, 1); | |
411 | return (gch); | |
412 | } | |
413 | ||
414 | speed(n) | |
415 | int n; | |
416 | { | |
417 | register int *p; | |
418 | ||
419 | for (p = bauds; *p != -1; p++) | |
420 | if (*p == n) | |
421 | return (p - bauds); | |
422 | return (NULL); | |
423 | } | |
424 | ||
425 | any(c, p) | |
426 | register char c, *p; | |
427 | { | |
428 | while (p && *p) | |
429 | if (*p++ == c) | |
430 | return (1); | |
431 | return (0); | |
432 | } | |
433 | ||
434 | size(s) | |
435 | register char *s; | |
436 | { | |
437 | register int i = 0; | |
438 | ||
439 | while (s && *s++) | |
440 | i++; | |
441 | return (i); | |
442 | } | |
443 | ||
444 | char * | |
445 | interp(s) | |
446 | register char *s; | |
447 | { | |
448 | static char buf[256]; | |
449 | register char *p = buf, c, *q; | |
450 | ||
451 | while (c = *s++) { | |
452 | for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++) | |
453 | if (*q++ == c) { | |
454 | *p++ = '\\'; *p++ = *q; | |
455 | goto next; | |
456 | } | |
457 | if (c < 040) { | |
458 | *p++ = '^'; *p++ = c + 'A'-1; | |
459 | } else if (c == 0177) { | |
460 | *p++ = '^'; *p++ = '?'; | |
461 | } else | |
462 | *p++ = c; | |
463 | next: | |
464 | ; | |
465 | } | |
466 | *p = '\0'; | |
467 | return (buf); | |
468 | } | |
469 | ||
470 | char * | |
471 | ctrl(c) | |
472 | char c; | |
473 | { | |
474 | static char s[3]; | |
475 | ||
476 | if (c < 040 || c == 0177) { | |
477 | s[0] = '^'; | |
478 | s[1] = c == 0177 ? '?' : c+'A'-1; | |
479 | s[2] = '\0'; | |
480 | } else { | |
481 | s[0] = c; | |
482 | s[1] = '\0'; | |
483 | } | |
484 | return (s); | |
485 | } | |
486 | ||
487 | /* | |
488 | * Help command | |
489 | */ | |
490 | help(c) | |
491 | char c; | |
492 | { | |
493 | register esctable_t *p; | |
494 | extern esctable_t etable[]; | |
495 | ||
496 | printf("%c\r\n", c); | |
497 | for (p = etable; p->e_char; p++) { | |
498 | if ((p->e_flags&PRIV) && uid) | |
499 | continue; | |
500 | printf("%2s", ctrl(character(value(ESCAPE)))); | |
501 | printf("%-2s %c %s\r\n", ctrl(p->e_char), | |
502 | p->e_flags&EXP ? '*': ' ', p->e_help); | |
503 | } | |
504 | } | |
505 | ||
506 | /* | |
507 | * Set up the "remote" tty's state | |
508 | */ | |
509 | ttysetup(speed) | |
510 | int speed; | |
511 | { | |
512 | unsigned bits = LDECCTQ; | |
513 | ||
514 | arg.sg_ispeed = arg.sg_ospeed = speed; | |
515 | arg.sg_flags = RAW; | |
516 | if (boolean(value(TAND))) | |
517 | arg.sg_flags |= TANDEM; | |
518 | ioctl(FD, TIOCSETP, (char *)&arg); | |
519 | ioctl(FD, TIOCLBIS, (char *)&bits); | |
520 | } | |
521 | ||
522 | /* | |
523 | * Return "simple" name from a file name, | |
524 | * strip leading directories. | |
525 | */ | |
526 | char * | |
527 | sname(s) | |
528 | register char *s; | |
529 | { | |
530 | register char *p = s; | |
531 | ||
532 | while (*s) | |
533 | if (*s++ == '/') | |
534 | p = s; | |
535 | return (p); | |
536 | } | |
537 | ||
538 | static char partab[0200]; | |
539 | static int bits8; | |
540 | ||
541 | /* | |
542 | * Do a write to the remote machine with the correct parity. | |
543 | * We are doing 8 bit wide output, so we just generate a character | |
544 | * with the right parity and output it. | |
545 | */ | |
546 | pwrite(fd, buf, n) | |
547 | int fd; | |
548 | char *buf; | |
549 | register int n; | |
550 | { | |
551 | register int i; | |
552 | register char *bp; | |
553 | extern int errno; | |
554 | ||
555 | bp = buf; | |
556 | if (bits8 == 0) { | |
557 | static char *mbp; static sz; | |
558 | ||
559 | if (mbp == 0 || n > sz) { | |
560 | if (mbp) | |
561 | free(mbp); | |
562 | mbp = (char *) malloc(n); | |
563 | sz = n; | |
564 | } | |
565 | ||
566 | bp = mbp; | |
567 | for (i = 0; i < n; i++) | |
568 | *bp++ = partab[*buf++ & 0177]; | |
569 | bp = mbp; | |
570 | } | |
571 | if (write(fd, bp, n) < 0) { | |
572 | if (errno == EIO) | |
573 | tipabort("Lost carrier."); | |
574 | /* this is questionable */ | |
575 | perror("write"); | |
576 | } | |
577 | } | |
578 | ||
579 | /* | |
580 | * Build a parity table with appropriate high-order bit. | |
581 | */ | |
582 | setparity(defparity) | |
583 | char *defparity; | |
584 | { | |
585 | register int i, flip, clr, set; | |
586 | char *parity; | |
587 | extern char evenpartab[]; | |
588 | ||
589 | if (value(PARITY) == NOSTR) | |
590 | value(PARITY) = defparity; | |
591 | parity = value(PARITY); | |
592 | if (equal(parity, "none")) { | |
593 | bits8 = 1; | |
594 | return; | |
595 | } | |
596 | bits8 = 0; | |
597 | flip = 0; | |
598 | clr = 0377; | |
599 | set = 0; | |
600 | if (equal(parity, "odd")) | |
601 | flip = 0200; /* reverse bit 7 */ | |
602 | else if (equal(parity, "zero")) | |
603 | clr = 0177; /* turn off bit 7 */ | |
604 | else if (equal(parity, "one")) | |
605 | set = 0200; /* turn on bit 7 */ | |
606 | else if (!equal(parity, "even")) { | |
607 | (void) fprintf(stderr, "%s: unknown parity value\r\n", parity); | |
608 | (void) fflush(stderr); | |
609 | } | |
610 | for (i = 0; i < 0200; i++) | |
611 | partab[i] = evenpartab[i] ^ flip | set & clr; | |
612 | } |