Annotation of src/usr.bin/tip/tip.c, Revision 1.36
1.36 ! nicm 1: /* $OpenBSD: tip.c,v 1.35 2009/10/27 23:59:45 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: /*
34: * tip - UNIX link to other systems
35: * tip [-v] [-speed] system-name
36: * or
37: * cu phone-number [-s speed] [-l line] [-a acu]
38: */
1.36 ! nicm 39:
! 40: #include <sys/types.h>
! 41: #include <sys/socket.h>
! 42:
1.1 deraadt 43: #include "tip.h"
44: #include "pathnames.h"
45:
1.2 deraadt 46: int disc = TTYDISC; /* tip normally runs this way */
1.1 deraadt 47: char PNbuf[256]; /* This limits the size of a number */
48:
1.26 moritz 49: static void intprompt(int);
50: static void tipin(void);
51: static int escape(void);
52:
1.8 deraadt 53: int
1.25 deraadt 54: main(int argc, char *argv[])
1.1 deraadt 55: {
1.33 moritz 56: char *sys = NULL, sbuf[12], *p;
1.36 ! nicm 57: int i, pair[2];
1.32 mcbride 58:
59: /* XXX preserve previous braindamaged behavior */
60: setboolean(value(DC), TRUE);
1.1 deraadt 61:
62: gid = getgid();
63: egid = getegid();
64: uid = getuid();
65: euid = geteuid();
1.13 millert 66: if (equal(__progname, "cu")) {
1.1 deraadt 67: cumode = 1;
68: cumain(argc, argv);
69: goto cucommon;
70: }
71:
72: if (argc > 4) {
1.34 sobrado 73: fprintf(stderr, "usage: tip [-nv] [-speed] [system-name]\n");
1.1 deraadt 74: exit(1);
75: }
76: if (!isatty(0)) {
1.13 millert 77: fprintf(stderr, "%s: must be interactive\n", __progname);
1.1 deraadt 78: exit(1);
79: }
80:
81: for (; argc > 1; argv++, argc--) {
82: if (argv[1][0] != '-')
1.27 deraadt 83: sys = argv[1];
1.1 deraadt 84: else switch (argv[1][1]) {
85:
86: case 'v':
87: vflag++;
88: break;
89:
1.9 todd 90: case 'n':
91: noesc++;
92: break;
93:
1.1 deraadt 94: case '0': case '1': case '2': case '3': case '4':
95: case '5': case '6': case '7': case '8': case '9':
96: BR = atoi(&argv[1][1]);
97: break;
98:
99: default:
1.13 millert 100: fprintf(stderr, "%s: %s, unknown option\n", __progname,
101: argv[1]);
1.1 deraadt 102: break;
103: }
104: }
105:
1.33 moritz 106: if (sys == NULL)
1.1 deraadt 107: goto notnumber;
1.27 deraadt 108: if (isalpha(*sys))
1.1 deraadt 109: goto notnumber;
110: /*
111: * System name is really a phone number...
112: * Copy the number then stomp on the original (in case the number
113: * is private, we don't want 'ps' or 'w' to find it).
114: */
1.27 deraadt 115: if (strlen(sys) > sizeof PNbuf - 1) {
1.13 millert 116: fprintf(stderr, "%s: phone number too long (max = %d bytes)\n",
1.14 pvalchev 117: __progname, (int)sizeof(PNbuf) - 1);
1.1 deraadt 118: exit(1);
119: }
1.27 deraadt 120: strlcpy(PNbuf, sys, sizeof PNbuf - 1);
121: for (p = sys; *p; p++)
1.1 deraadt 122: *p = '\0';
123: PN = PNbuf;
1.8 deraadt 124: (void)snprintf(sbuf, sizeof(sbuf), "tip%ld", BR);
1.27 deraadt 125: sys = sbuf;
1.1 deraadt 126:
127: notnumber:
128: (void)signal(SIGINT, cleanup);
129: (void)signal(SIGQUIT, cleanup);
130: (void)signal(SIGHUP, cleanup);
131: (void)signal(SIGTERM, cleanup);
1.24 otto 132: (void)signal(SIGCHLD, SIG_DFL);
1.1 deraadt 133:
1.27 deraadt 134: if ((i = hunt(sys)) == 0) {
1.1 deraadt 135: printf("all ports busy\n");
136: exit(3);
137: }
138: if (i == -1) {
139: printf("link down\n");
140: (void)uu_unlock(uucplock);
141: exit(3);
142: }
143: setbuf(stdout, NULL);
144: loginit();
145:
146: /*
147: * Now that we have the logfile and the ACU open
148: * return to the real uid and gid. These things will
149: * be closed on exit. Swap real and effective uid's
150: * so we can get the original permissions back
151: * for removing the uucp lock.
152: */
153: user_uid();
154:
155: /*
156: * Kludge, their's no easy way to get the initialization
157: * in the right order, so force it here
158: */
1.33 moritz 159: if ((PH = getenv("PHONES")) == NULL)
1.1 deraadt 160: PH = _PATH_PHONES;
161: vinit(); /* init variables */
1.12 millert 162: setparity("none"); /* set the parity table */
1.1 deraadt 163:
164: /*
165: * Hardwired connections require the
166: * line speed set before they make any transmissions
167: * (this is particularly true of things like a DF03-AC)
168: */
1.19 millert 169: if (HW && ttysetup(number(value(BAUDRATE)))) {
170: fprintf(stderr, "%s: bad baud rate %ld\n", __progname,
171: number(value(BAUDRATE)));
172: daemon_uid();
173: (void)uu_unlock(uucplock);
174: exit(3);
175: }
1.25 deraadt 176: if ((p = con())) {
1.1 deraadt 177: printf("\07%s\n[EOT]\n", p);
178: daemon_uid();
179: (void)uu_unlock(uucplock);
180: exit(1);
181: }
1.19 millert 182: if (!HW && ttysetup(number(value(BAUDRATE)))) {
183: fprintf(stderr, "%s: bad baud rate %ld\n", __progname,
184: number(value(BAUDRATE)));
185: daemon_uid();
186: (void)uu_unlock(uucplock);
187: exit(3);
188: }
1.1 deraadt 189: cucommon:
190: /*
191: * From here down the code is shared with
192: * the "cu" version of tip.
193: */
1.10 jason 194:
195: i = fcntl(FD, F_GETFL);
196: if (i == -1) {
197: perror("fcntl");
1.23 deraadt 198: cleanup(0);
1.10 jason 199: }
200: i = fcntl(FD, F_SETFL, i & ~O_NONBLOCK);
201: if (i == -1) {
202: perror("fcntl");
1.23 deraadt 203: cleanup(0);
1.10 jason 204: }
1.1 deraadt 205:
1.2 deraadt 206: tcgetattr(0, &defterm);
1.22 deraadt 207: gotdefterm = 1;
1.2 deraadt 208: term = defterm;
209: term.c_lflag &= ~(ICANON|IEXTEN|ECHO);
210: term.c_iflag &= ~(INPCK|ICRNL);
211: term.c_oflag &= ~OPOST;
212: term.c_cc[VMIN] = 1;
213: term.c_cc[VTIME] = 0;
214: defchars = term;
215: term.c_cc[VINTR] = term.c_cc[VQUIT] = term.c_cc[VSUSP] =
1.25 deraadt 216: term.c_cc[VDSUSP] = term.c_cc[VDISCARD] =
217: term.c_cc[VLNEXT] = _POSIX_VDISABLE;
1.1 deraadt 218: raw();
219:
220: (void)signal(SIGALRM, timeout);
1.29 deraadt 221:
222: if (value(LINEDISC) != TTYDISC) {
223: int ld = (int)value(LINEDISC);
224: ioctl(FD, TIOCSETD, &ld);
225: }
1.1 deraadt 226:
1.36 ! nicm 227: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0) {
! 228: daemon_uid();
! 229: (void)uu_unlock(uucplock);
! 230: err(3, "socketpair");
! 231: }
! 232:
1.1 deraadt 233: /*
234: * Everything's set up now:
235: * connection established (hardwired or dialup)
236: * line conditioned (baud rate, mode, etc.)
237: * internal data structures (variables)
238: * so, fork one process for local side and one for remote.
239: */
240: printf(cumode ? "Connected\r\n" : "\07connected\r\n");
1.23 deraadt 241: tipin_pid = getpid();
1.36 ! nicm 242: switch (tipout_pid = fork()) {
! 243: case -1:
! 244: daemon_uid();
! 245: (void)uu_unlock(uucplock);
! 246: err(3, "fork");
! 247: case 0:
! 248: close(pair[1]);
! 249: tipin_fd = pair[0];
! 250: tipout();
! 251: default:
! 252: close(pair[0]);
! 253: tipout_fd = pair[1];
1.1 deraadt 254: tipin();
1.36 ! nicm 255: }
1.1 deraadt 256: /*NOTREACHED*/
1.8 deraadt 257: exit(0);
1.1 deraadt 258: }
259:
260: void
1.23 deraadt 261: cleanup(int signo)
1.1 deraadt 262: {
263: daemon_uid();
264: (void)uu_unlock(uucplock);
265: if (odisc)
1.27 deraadt 266: ioctl(0, TIOCSETD, &odisc);
1.22 deraadt 267: unraw();
1.23 deraadt 268: if (signo && tipout_pid) {
269: kill(tipout_pid, signo);
270: wait(NULL);
271: }
1.1 deraadt 272: exit(0);
273: }
274:
275: /*
276: * Muck with user ID's. We are setuid to the owner of the lock
277: * directory when we start. user_uid() reverses real and effective
278: * ID's after startup, to run with the user's permissions.
279: * daemon_uid() switches back to the privileged uid for unlocking.
280: * Finally, to avoid running a shell with the wrong real uid,
281: * shell_uid() sets real and effective uid's to the user's real ID.
282: */
283: static int uidswapped;
284:
1.8 deraadt 285: void
1.25 deraadt 286: user_uid(void)
1.1 deraadt 287: {
288: if (uidswapped == 0) {
289: seteuid(uid);
290: uidswapped = 1;
291: }
292: }
293:
1.8 deraadt 294: void
1.25 deraadt 295: daemon_uid(void)
1.1 deraadt 296: {
297:
298: if (uidswapped) {
299: seteuid(euid);
300: uidswapped = 0;
301: }
302: }
303:
1.8 deraadt 304: void
1.25 deraadt 305: shell_uid(void)
1.1 deraadt 306: {
1.7 deraadt 307: setegid(gid);
1.1 deraadt 308: seteuid(uid);
309: }
310:
311: /*
312: * put the controlling keyboard into raw mode
313: */
1.8 deraadt 314: void
1.25 deraadt 315: raw(void)
1.1 deraadt 316: {
1.2 deraadt 317: tcsetattr(0, TCSADRAIN, &term);
1.1 deraadt 318: }
319:
320:
321: /*
322: * return keyboard to normal mode
323: */
1.8 deraadt 324: void
1.25 deraadt 325: unraw(void)
1.1 deraadt 326: {
1.22 deraadt 327: if (gotdefterm)
328: tcsetattr(0, TCSADRAIN, &defterm);
1.1 deraadt 329: }
330:
331: static jmp_buf promptbuf;
332:
333: /*
334: * Print string ``s'', then read a string
335: * in from the terminal. Handles signals & allows use of
336: * normal erase and kill characters.
337: */
1.8 deraadt 338: int
1.25 deraadt 339: prompt(char *s, char *p, size_t sz)
1.1 deraadt 340: {
1.15 millert 341: int c;
342: char *b = p;
1.1 deraadt 343: sig_t oint, oquit;
344:
345: stoprompt = 0;
346: oint = signal(SIGINT, intprompt);
347: oquit = signal(SIGQUIT, SIG_IGN);
348: unraw();
349: printf("%s", s);
350: if (setjmp(promptbuf) == 0)
1.6 millert 351: while ((c = getchar()) != EOF && (*p = c) != '\n' && --sz > 0)
1.1 deraadt 352: p++;
353: *p = '\0';
354:
355: raw();
356: (void)signal(SIGINT, oint);
357: (void)signal(SIGQUIT, oquit);
358: return (stoprompt || p == b);
359: }
360:
361: /*
362: * Interrupt service routine during prompting
363: */
1.27 deraadt 364: /*ARGSUSED*/
1.26 moritz 365: static void
366: intprompt(int signo)
1.1 deraadt 367: {
368: (void)signal(SIGINT, SIG_IGN);
369: stoprompt = 1;
370: printf("\r\n");
371: longjmp(promptbuf, 1);
372: }
373:
374: /*
375: * ****TIPIN TIPIN****
376: */
1.26 moritz 377: static void
1.25 deraadt 378: tipin(void)
1.1 deraadt 379: {
1.27 deraadt 380: int bol = 1;
1.16 deraadt 381: int gch;
1.17 deraadt 382: char ch;
1.1 deraadt 383:
384: /*
385: * Kinda klugey here...
386: * check for scripting being turned on from the .tiprc file,
387: * but be careful about just using setscript(), as we may
388: * send a SIGEMT before tipout has a chance to set up catching
389: * it; so wait a second, then setscript()
390: */
391: if (boolean(value(SCRIPT))) {
392: sleep(1);
393: setscript();
394: }
395:
396: while (1) {
1.2 deraadt 397: gch = getchar()&STRIP_PAR;
1.16 deraadt 398: /* XXX does not check for EOF */
1.1 deraadt 399: if ((gch == character(value(ESCAPE))) && bol) {
1.9 todd 400: if (!noesc) {
401: if (!(gch = escape()))
402: continue;
403: }
1.1 deraadt 404: } else if (!cumode && gch == character(value(RAISECHAR))) {
1.4 millert 405: setboolean(value(RAISE), !boolean(value(RAISE)));
1.1 deraadt 406: continue;
407: } else if (gch == '\r') {
408: bol = 1;
1.17 deraadt 409: ch = gch;
410: parwrite(FD, &ch, 1);
1.1 deraadt 411: if (boolean(value(HALFDUPLEX)))
412: printf("\r\n");
413: continue;
414: } else if (!cumode && gch == character(value(FORCE)))
1.2 deraadt 415: gch = getchar()&STRIP_PAR;
1.1 deraadt 416: bol = any(gch, value(EOL));
417: if (boolean(value(RAISE)) && islower(gch))
418: gch = toupper(gch);
1.17 deraadt 419: ch = gch;
420: parwrite(FD, &ch, 1);
1.1 deraadt 421: if (boolean(value(HALFDUPLEX)))
1.17 deraadt 422: printf("%c", ch);
1.1 deraadt 423: }
424: }
425:
426: extern esctable_t etable[];
427:
428: /*
429: * Escape handler --
430: * called on recognition of ``escapec'' at the beginning of a line
431: */
1.26 moritz 432: static int
1.25 deraadt 433: escape(void)
1.1 deraadt 434: {
1.16 deraadt 435: int gch;
1.15 millert 436: esctable_t *p;
1.1 deraadt 437: char c = character(value(ESCAPE));
438:
1.2 deraadt 439: gch = (getchar()&STRIP_PAR);
1.16 deraadt 440: /* XXX does not check for EOF */
1.1 deraadt 441: for (p = etable; p->e_char; p++)
442: if (p->e_char == gch) {
443: if ((p->e_flags&PRIV) && uid)
444: continue;
445: printf("%s", ctrl(c));
446: (*p->e_func)(gch);
447: return (0);
448: }
449: /* ESCAPE ESCAPE forces ESCAPE */
450: if (c != gch)
1.11 deraadt 451: parwrite(FD, &c, 1);
1.1 deraadt 452: return (gch);
453: }
454:
1.8 deraadt 455: int
1.25 deraadt 456: any(int cc, char *p)
1.1 deraadt 457: {
1.8 deraadt 458: char c = cc;
1.1 deraadt 459: while (p && *p)
460: if (*p++ == c)
461: return (1);
462: return (0);
463: }
464:
1.28 deraadt 465: size_t
1.25 deraadt 466: size(char *s)
1.1 deraadt 467: {
1.28 deraadt 468: size_t i = 0;
1.1 deraadt 469:
470: while (s && *s++)
471: i++;
472: return (i);
473: }
474:
475: char *
1.25 deraadt 476: interp(char *s)
1.1 deraadt 477: {
478: static char buf[256];
1.15 millert 479: char *p = buf, c, *q;
1.1 deraadt 480:
1.8 deraadt 481: while ((c = *s++)) {
1.1 deraadt 482: for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++)
483: if (*q++ == c) {
484: *p++ = '\\'; *p++ = *q;
485: goto next;
486: }
487: if (c < 040) {
488: *p++ = '^'; *p++ = c + 'A'-1;
489: } else if (c == 0177) {
490: *p++ = '^'; *p++ = '?';
491: } else
492: *p++ = c;
493: next:
494: ;
495: }
496: *p = '\0';
497: return (buf);
498: }
499:
500: char *
1.25 deraadt 501: ctrl(char c)
1.1 deraadt 502: {
503: static char s[3];
504:
505: if (c < 040 || c == 0177) {
506: s[0] = '^';
507: s[1] = c == 0177 ? '?' : c+'A'-1;
508: s[2] = '\0';
509: } else {
510: s[0] = c;
511: s[1] = '\0';
512: }
513: return (s);
514: }
515:
516: /*
517: * Help command
518: */
1.8 deraadt 519: void
1.26 moritz 520: help(int c)
1.1 deraadt 521: {
1.15 millert 522: esctable_t *p;
1.1 deraadt 523:
524: printf("%c\r\n", c);
525: for (p = etable; p->e_char; p++) {
526: if ((p->e_flags&PRIV) && uid)
527: continue;
528: printf("%2s", ctrl(character(value(ESCAPE))));
529: printf("%-2s %c %s\r\n", ctrl(p->e_char),
530: p->e_flags&EXP ? '*': ' ', p->e_help);
531: }
532: }
533:
534: /*
535: * Set up the "remote" tty's state
536: */
1.19 millert 537: int
1.25 deraadt 538: ttysetup(int speed)
1.1 deraadt 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)))
1.25 deraadt 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
1.27 deraadt 569: parwrite(int fd, char *buf, size_t n)
1.1 deraadt 570: {
1.15 millert 571: int i;
572: char *bp;
1.1 deraadt 573:
574: bp = buf;
575: if (bits8 == 0)
576: for (i = 0; i < n; i++) {
577: *bp = partab[(*bp) & 0177];
578: bp++;
579: }
580: if (write(fd, buf, n) < 0) {
581: if (errno == EIO)
582: tipabort("Lost carrier.");
583: /* this is questionable */
584: perror("write");
585: }
586: }
587:
588: /*
589: * Build a parity table with appropriate high-order bit.
590: */
1.8 deraadt 591: void
1.25 deraadt 592: setparity(char *defparity)
1.1 deraadt 593: {
1.15 millert 594: int i, flip, clr, set;
1.1 deraadt 595: char *parity;
1.4 millert 596: extern const unsigned char evenpartab[];
1.1 deraadt 597:
1.33 moritz 598: if (value(PARITY) == NULL)
1.1 deraadt 599: value(PARITY) = defparity;
600: parity = value(PARITY);
601: if (equal(parity, "none")) {
602: bits8 = 1;
603: return;
604: }
605: bits8 = 0;
606: flip = 0;
607: clr = 0377;
608: set = 0;
609: if (equal(parity, "odd"))
610: flip = 0200; /* reverse bit 7 */
611: else if (equal(parity, "zero"))
612: clr = 0177; /* turn off bit 7 */
613: else if (equal(parity, "one"))
614: set = 0200; /* turn on bit 7 */
615: else if (!equal(parity, "even")) {
616: (void) fprintf(stderr, "%s: unknown parity value\r\n", parity);
617: (void) fflush(stderr);
618: }
619: for (i = 0; i < 0200; i++)
1.18 hugh 620: partab[i] = ((evenpartab[i] ^ flip) | set) & clr;
1.1 deraadt 621: }
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