Annotation of src/usr.bin/tip/tip.c, Revision 1.24
1.24 ! otto 1: /* $OpenBSD: tip.c,v 1.23 2004/05/26 18:17:59 deraadt Exp $ */
1.5 millert 2: /* $NetBSD: tip.c,v 1.13 1997/04/20 00:03:05 mellon Exp $ */
1.1 deraadt 3:
4: /*
5: * Copyright (c) 1983, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
1.20 millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
33: #ifndef lint
1.18 hugh 34: static const char copyright[] =
1.1 deraadt 35: "@(#) Copyright (c) 1983, 1993\n\
36: The Regents of the University of California. All rights reserved.\n";
37: #endif /* not lint */
38:
39: #ifndef lint
40: #if 0
41: static char sccsid[] = "@(#)tip.c 8.1 (Berkeley) 6/6/93";
42: #endif
1.24 ! otto 43: static const char rcsid[] = "$OpenBSD: tip.c,v 1.23 2004/05/26 18:17:59 deraadt Exp $";
1.1 deraadt 44: #endif /* not lint */
45:
46: /*
47: * tip - UNIX link to other systems
48: * tip [-v] [-speed] system-name
49: * or
50: * cu phone-number [-s speed] [-l line] [-a acu]
51: */
52: #include "tip.h"
53: #include "pathnames.h"
54:
1.2 deraadt 55: int disc = TTYDISC; /* tip normally runs this way */
1.1 deraadt 56: void intprompt();
57: void timeout();
1.23 deraadt 58: void cleanup(int);
1.1 deraadt 59: char PNbuf[256]; /* This limits the size of a number */
60:
1.8 deraadt 61: int
1.1 deraadt 62: main(argc, argv)
1.8 deraadt 63: int argc;
1.1 deraadt 64: char *argv[];
65: {
66: char *system = NOSTR;
1.15 millert 67: int i;
68: char *p;
1.1 deraadt 69: char sbuf[12];
70:
71: gid = getgid();
72: egid = getegid();
73: uid = getuid();
74: euid = geteuid();
1.13 millert 75: if (equal(__progname, "cu")) {
1.1 deraadt 76: cumode = 1;
77: cumain(argc, argv);
78: goto cucommon;
79: }
80:
81: if (argc > 4) {
82: fprintf(stderr, "usage: tip [-v] [-speed] [system-name]\n");
83: exit(1);
84: }
85: if (!isatty(0)) {
1.13 millert 86: fprintf(stderr, "%s: must be interactive\n", __progname);
1.1 deraadt 87: exit(1);
88: }
89:
90: for (; argc > 1; argv++, argc--) {
91: if (argv[1][0] != '-')
92: system = argv[1];
93: else switch (argv[1][1]) {
94:
95: case 'v':
96: vflag++;
97: break;
98:
1.9 todd 99: case 'n':
100: noesc++;
101: break;
102:
1.1 deraadt 103: case '0': case '1': case '2': case '3': case '4':
104: case '5': case '6': case '7': case '8': case '9':
105: BR = atoi(&argv[1][1]);
106: break;
107:
108: default:
1.13 millert 109: fprintf(stderr, "%s: %s, unknown option\n", __progname,
110: argv[1]);
1.1 deraadt 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) {
1.13 millert 125: fprintf(stderr, "%s: phone number too long (max = %d bytes)\n",
1.14 pvalchev 126: __progname, (int)sizeof(PNbuf) - 1);
1.1 deraadt 127: exit(1);
128: }
129: strncpy( PNbuf, system, sizeof PNbuf - 1 );
130: for (p = system; *p; p++)
131: *p = '\0';
132: PN = PNbuf;
1.8 deraadt 133: (void)snprintf(sbuf, sizeof(sbuf), "tip%ld", BR);
1.1 deraadt 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);
1.24 ! otto 141: (void)signal(SIGCHLD, SIG_DFL);
1.1 deraadt 142:
143: if ((i = hunt(system)) == 0) {
144: printf("all ports busy\n");
145: exit(3);
146: }
147: if (i == -1) {
148: printf("link down\n");
149: (void)uu_unlock(uucplock);
150: exit(3);
151: }
152: setbuf(stdout, NULL);
153: loginit();
154:
155: /*
156: * Now that we have the logfile and the ACU open
157: * return to the real uid and gid. These things will
158: * be closed on exit. Swap real and effective uid's
159: * so we can get the original permissions back
160: * for removing the uucp lock.
161: */
162: user_uid();
163:
164: /*
165: * Kludge, their's no easy way to get the initialization
166: * in the right order, so force it here
167: */
168: if ((PH = getenv("PHONES")) == NOSTR)
169: PH = _PATH_PHONES;
170: vinit(); /* init variables */
1.12 millert 171: setparity("none"); /* set the parity table */
1.1 deraadt 172:
173: /*
174: * Hardwired connections require the
175: * line speed set before they make any transmissions
176: * (this is particularly true of things like a DF03-AC)
177: */
1.19 millert 178: if (HW && ttysetup(number(value(BAUDRATE)))) {
179: fprintf(stderr, "%s: bad baud rate %ld\n", __progname,
180: number(value(BAUDRATE)));
181: daemon_uid();
182: (void)uu_unlock(uucplock);
183: exit(3);
184: }
1.8 deraadt 185: if ((p = connect())) {
1.1 deraadt 186: printf("\07%s\n[EOT]\n", p);
187: daemon_uid();
188: (void)uu_unlock(uucplock);
189: exit(1);
190: }
1.19 millert 191: if (!HW && ttysetup(number(value(BAUDRATE)))) {
192: fprintf(stderr, "%s: bad baud rate %ld\n", __progname,
193: number(value(BAUDRATE)));
194: daemon_uid();
195: (void)uu_unlock(uucplock);
196: exit(3);
197: }
1.1 deraadt 198: cucommon:
199: /*
200: * From here down the code is shared with
201: * the "cu" version of tip.
202: */
1.10 jason 203:
204: i = fcntl(FD, F_GETFL);
205: if (i == -1) {
206: perror("fcntl");
1.23 deraadt 207: cleanup(0);
1.10 jason 208: }
209: i = fcntl(FD, F_SETFL, i & ~O_NONBLOCK);
210: if (i == -1) {
211: perror("fcntl");
1.23 deraadt 212: cleanup(0);
1.10 jason 213: }
1.1 deraadt 214:
1.2 deraadt 215: tcgetattr(0, &defterm);
1.22 deraadt 216: gotdefterm = 1;
1.2 deraadt 217: term = defterm;
218: term.c_lflag &= ~(ICANON|IEXTEN|ECHO);
219: term.c_iflag &= ~(INPCK|ICRNL);
220: term.c_oflag &= ~OPOST;
221: term.c_cc[VMIN] = 1;
222: term.c_cc[VTIME] = 0;
223: defchars = term;
224: term.c_cc[VINTR] = term.c_cc[VQUIT] = term.c_cc[VSUSP] =
225: term.c_cc[VDSUSP] = term.c_cc[VDISCARD] =
226: term.c_cc[VLNEXT] = _POSIX_VDISABLE;
1.1 deraadt 227: raw();
228:
229: pipe(fildes); pipe(repdes);
230: (void)signal(SIGALRM, timeout);
231:
232: /*
233: * Everything's set up now:
234: * connection established (hardwired or dialup)
235: * line conditioned (baud rate, mode, etc.)
236: * internal data structures (variables)
237: * so, fork one process for local side and one for remote.
238: */
239: printf(cumode ? "Connected\r\n" : "\07connected\r\n");
1.23 deraadt 240: tipin_pid = getpid();
241: if ((tipout_pid = fork()))
1.1 deraadt 242: tipin();
243: else
244: tipout();
245: /*NOTREACHED*/
1.8 deraadt 246: exit(0);
1.1 deraadt 247: }
248:
249: void
1.23 deraadt 250: cleanup(int signo)
1.1 deraadt 251: {
252:
253: daemon_uid();
254: (void)uu_unlock(uucplock);
255: if (odisc)
256: ioctl(0, TIOCSETD, (char *)&odisc);
1.22 deraadt 257: unraw();
1.23 deraadt 258: if (signo && tipout_pid) {
259: kill(tipout_pid, signo);
260: wait(NULL);
261: }
1.1 deraadt 262: exit(0);
263: }
264:
265: /*
266: * Muck with user ID's. We are setuid to the owner of the lock
267: * directory when we start. user_uid() reverses real and effective
268: * ID's after startup, to run with the user's permissions.
269: * daemon_uid() switches back to the privileged uid for unlocking.
270: * Finally, to avoid running a shell with the wrong real uid,
271: * shell_uid() sets real and effective uid's to the user's real ID.
272: */
273: static int uidswapped;
274:
1.8 deraadt 275: void
1.1 deraadt 276: user_uid()
277: {
278: if (uidswapped == 0) {
279: seteuid(uid);
280: uidswapped = 1;
281: }
282: }
283:
1.8 deraadt 284: void
1.1 deraadt 285: daemon_uid()
286: {
287:
288: if (uidswapped) {
289: seteuid(euid);
290: uidswapped = 0;
291: }
292: }
293:
1.8 deraadt 294: void
1.1 deraadt 295: shell_uid()
296: {
1.7 deraadt 297: setegid(gid);
1.1 deraadt 298: seteuid(uid);
299: }
300:
301: /*
302: * put the controlling keyboard into raw mode
303: */
1.8 deraadt 304: void
1.1 deraadt 305: raw()
306: {
1.2 deraadt 307: tcsetattr(0, TCSADRAIN, &term);
1.1 deraadt 308: }
309:
310:
311: /*
312: * return keyboard to normal mode
313: */
1.8 deraadt 314: void
1.1 deraadt 315: unraw()
316: {
1.22 deraadt 317: if (gotdefterm)
318: tcsetattr(0, TCSADRAIN, &defterm);
1.1 deraadt 319: }
320:
321: static jmp_buf promptbuf;
322:
323: /*
324: * Print string ``s'', then read a string
325: * in from the terminal. Handles signals & allows use of
326: * normal erase and kill characters.
327: */
1.8 deraadt 328: int
1.6 millert 329: prompt(s, p, sz)
1.1 deraadt 330: char *s;
1.8 deraadt 331: char *p;
1.6 millert 332: size_t sz;
1.1 deraadt 333: {
1.15 millert 334: int c;
335: char *b = p;
1.1 deraadt 336: sig_t oint, oquit;
337:
338: stoprompt = 0;
339: oint = signal(SIGINT, intprompt);
340: oquit = signal(SIGQUIT, SIG_IGN);
341: unraw();
342: printf("%s", s);
343: if (setjmp(promptbuf) == 0)
1.6 millert 344: while ((c = getchar()) != EOF && (*p = c) != '\n' && --sz > 0)
1.1 deraadt 345: p++;
346: *p = '\0';
347:
348: raw();
349: (void)signal(SIGINT, oint);
350: (void)signal(SIGQUIT, oquit);
351: return (stoprompt || p == b);
352: }
353:
354: /*
355: * Interrupt service routine during prompting
356: */
357: void
358: intprompt()
359: {
360:
361: (void)signal(SIGINT, SIG_IGN);
362: stoprompt = 1;
363: printf("\r\n");
364: longjmp(promptbuf, 1);
365: }
366:
367: /*
368: * ****TIPIN TIPIN****
369: */
1.8 deraadt 370: void
1.1 deraadt 371: tipin()
372: {
1.16 deraadt 373: char bol = 1;
374: int gch;
1.17 deraadt 375: char ch;
1.1 deraadt 376:
377: /*
378: * Kinda klugey here...
379: * check for scripting being turned on from the .tiprc file,
380: * but be careful about just using setscript(), as we may
381: * send a SIGEMT before tipout has a chance to set up catching
382: * it; so wait a second, then setscript()
383: */
384: if (boolean(value(SCRIPT))) {
385: sleep(1);
386: setscript();
387: }
388:
389: while (1) {
1.2 deraadt 390: gch = getchar()&STRIP_PAR;
1.16 deraadt 391: /* XXX does not check for EOF */
1.1 deraadt 392: if ((gch == character(value(ESCAPE))) && bol) {
1.9 todd 393: if (!noesc) {
394: if (!(gch = escape()))
395: continue;
396: }
1.1 deraadt 397: } else if (!cumode && gch == character(value(RAISECHAR))) {
1.4 millert 398: setboolean(value(RAISE), !boolean(value(RAISE)));
1.1 deraadt 399: continue;
400: } else if (gch == '\r') {
401: bol = 1;
1.17 deraadt 402: ch = gch;
403: parwrite(FD, &ch, 1);
1.1 deraadt 404: if (boolean(value(HALFDUPLEX)))
405: printf("\r\n");
406: continue;
407: } else if (!cumode && gch == character(value(FORCE)))
1.2 deraadt 408: gch = getchar()&STRIP_PAR;
1.1 deraadt 409: bol = any(gch, value(EOL));
410: if (boolean(value(RAISE)) && islower(gch))
411: gch = toupper(gch);
1.17 deraadt 412: ch = gch;
413: parwrite(FD, &ch, 1);
1.1 deraadt 414: if (boolean(value(HALFDUPLEX)))
1.17 deraadt 415: printf("%c", ch);
1.1 deraadt 416: }
417: }
418:
419: extern esctable_t etable[];
420:
421: /*
422: * Escape handler --
423: * called on recognition of ``escapec'' at the beginning of a line
424: */
1.8 deraadt 425: int
1.1 deraadt 426: escape()
427: {
1.16 deraadt 428: int gch;
1.15 millert 429: esctable_t *p;
1.1 deraadt 430: char c = character(value(ESCAPE));
431:
1.2 deraadt 432: gch = (getchar()&STRIP_PAR);
1.16 deraadt 433: /* XXX does not check for EOF */
1.1 deraadt 434: for (p = etable; p->e_char; p++)
435: if (p->e_char == gch) {
436: if ((p->e_flags&PRIV) && uid)
437: continue;
438: printf("%s", ctrl(c));
439: (*p->e_func)(gch);
440: return (0);
441: }
442: /* ESCAPE ESCAPE forces ESCAPE */
443: if (c != gch)
1.11 deraadt 444: parwrite(FD, &c, 1);
1.1 deraadt 445: return (gch);
446: }
447:
1.8 deraadt 448: int
449: any(cc, p)
1.15 millert 450: int cc;
1.8 deraadt 451: char *p;
1.1 deraadt 452: {
1.8 deraadt 453: char c = cc;
1.1 deraadt 454: while (p && *p)
455: if (*p++ == c)
456: return (1);
457: return (0);
458: }
459:
1.8 deraadt 460: int
1.1 deraadt 461: size(s)
1.15 millert 462: char *s;
1.1 deraadt 463: {
1.15 millert 464: int i = 0;
1.1 deraadt 465:
466: while (s && *s++)
467: i++;
468: return (i);
469: }
470:
471: char *
472: interp(s)
1.15 millert 473: char *s;
1.1 deraadt 474: {
475: static char buf[256];
1.15 millert 476: char *p = buf, c, *q;
1.1 deraadt 477:
1.8 deraadt 478: while ((c = *s++)) {
1.1 deraadt 479: for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++)
480: if (*q++ == c) {
481: *p++ = '\\'; *p++ = *q;
482: goto next;
483: }
484: if (c < 040) {
485: *p++ = '^'; *p++ = c + 'A'-1;
486: } else if (c == 0177) {
487: *p++ = '^'; *p++ = '?';
488: } else
489: *p++ = c;
490: next:
491: ;
492: }
493: *p = '\0';
494: return (buf);
495: }
496:
497: char *
498: ctrl(c)
499: char c;
500: {
501: static char s[3];
502:
503: if (c < 040 || c == 0177) {
504: s[0] = '^';
505: s[1] = c == 0177 ? '?' : c+'A'-1;
506: s[2] = '\0';
507: } else {
508: s[0] = c;
509: s[1] = '\0';
510: }
511: return (s);
512: }
513:
514: /*
515: * Help command
516: */
1.8 deraadt 517: void
1.1 deraadt 518: help(c)
519: char c;
520: {
1.15 millert 521: esctable_t *p;
1.1 deraadt 522:
523: printf("%c\r\n", c);
524: for (p = etable; p->e_char; p++) {
525: if ((p->e_flags&PRIV) && uid)
526: continue;
527: printf("%2s", ctrl(character(value(ESCAPE))));
528: printf("%-2s %c %s\r\n", ctrl(p->e_char),
529: p->e_flags&EXP ? '*': ' ', p->e_help);
530: }
531: }
532:
533: /*
534: * Set up the "remote" tty's state
535: */
1.19 millert 536: int
1.1 deraadt 537: ttysetup(speed)
538: int speed;
539: {
1.2 deraadt 540: struct termios cntrl;
1.1 deraadt 541:
1.19 millert 542: if (tcgetattr(FD, &cntrl))
543: return (-1);
544: cfsetspeed(&cntrl, speed);
1.2 deraadt 545: cntrl.c_cflag &= ~(CSIZE|PARENB);
546: cntrl.c_cflag |= CS8;
1.5 millert 547: if (boolean(value(DC)))
548: cntrl.c_cflag |= CLOCAL;
1.21 millert 549: if (boolean(value(HARDWAREFLOW)))
550: cntrl.c_cflag |= CRTSCTS;
1.2 deraadt 551: cntrl.c_iflag &= ~(ISTRIP|ICRNL);
552: cntrl.c_oflag &= ~OPOST;
553: cntrl.c_lflag &= ~(ICANON|ISIG|IEXTEN|ECHO);
554: cntrl.c_cc[VMIN] = 1;
555: cntrl.c_cc[VTIME] = 0;
1.1 deraadt 556: if (boolean(value(TAND)))
1.2 deraadt 557: cntrl.c_iflag |= IXOFF;
1.19 millert 558: return (tcsetattr(FD, TCSAFLUSH, &cntrl));
1.1 deraadt 559: }
560:
561: static char partab[0200];
562:
563: /*
564: * Do a write to the remote machine with the correct parity.
565: * We are doing 8 bit wide output, so we just generate a character
566: * with the right parity and output it.
567: */
1.8 deraadt 568: void
1.11 deraadt 569: parwrite(fd, buf, n)
1.1 deraadt 570: int fd;
571: char *buf;
1.15 millert 572: int n;
1.1 deraadt 573: {
1.15 millert 574: int i;
575: char *bp;
1.1 deraadt 576:
577: bp = buf;
578: if (bits8 == 0)
579: for (i = 0; i < n; i++) {
580: *bp = partab[(*bp) & 0177];
581: bp++;
582: }
583: if (write(fd, buf, n) < 0) {
584: if (errno == EIO)
585: tipabort("Lost carrier.");
586: /* this is questionable */
587: perror("write");
588: }
589: }
590:
591: /*
592: * Build a parity table with appropriate high-order bit.
593: */
1.8 deraadt 594: void
1.1 deraadt 595: setparity(defparity)
596: char *defparity;
597: {
1.15 millert 598: int i, flip, clr, set;
1.1 deraadt 599: char *parity;
1.4 millert 600: extern const unsigned char evenpartab[];
1.1 deraadt 601:
602: if (value(PARITY) == NOSTR)
603: value(PARITY) = defparity;
604: parity = value(PARITY);
605: if (equal(parity, "none")) {
606: bits8 = 1;
607: return;
608: }
609: bits8 = 0;
610: flip = 0;
611: clr = 0377;
612: set = 0;
613: if (equal(parity, "odd"))
614: flip = 0200; /* reverse bit 7 */
615: else if (equal(parity, "zero"))
616: clr = 0177; /* turn off bit 7 */
617: else if (equal(parity, "one"))
618: set = 0200; /* turn on bit 7 */
619: else if (!equal(parity, "even")) {
620: (void) fprintf(stderr, "%s: unknown parity value\r\n", parity);
621: (void) fflush(stderr);
622: }
623: for (i = 0; i < 0200; i++)
1.18 hugh 624: partab[i] = ((evenpartab[i] ^ flip) | set) & clr;
1.1 deraadt 625: }
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