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1.19 ! art 1: /* $OpenBSD: rlogin.c,v 1.18 1997/09/03 18:01:01 kstailey Exp $ */
1.1 deraadt 2: /* $NetBSD: rlogin.c,v 1.8 1995/10/05 09:07:22 mycroft Exp $ */
3:
4: /*
5: * Copyright (c) 1983, 1990, 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.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
38: static char copyright[] =
39: "@(#) Copyright (c) 1983, 1990, 1993\n\
40: The Regents of the University of California. All rights reserved.\n";
41: #endif /* not lint */
42:
43: #ifndef lint
44: #if 0
45: static char sccsid[] = "@(#)rlogin.c 8.1 (Berkeley) 6/6/93";
46: #else
1.19 ! art 47: static char rcsid[] = "$OpenBSD: rlogin.c,v 1.18 1997/09/03 18:01:01 kstailey Exp $";
1.1 deraadt 48: #endif
49: #endif /* not lint */
50:
51: /*
52: * rlogin - remote login
53: */
54: #include <sys/param.h>
55: #include <sys/ioctl.h>
56: #include <sys/socket.h>
57: #include <sys/time.h>
58: #include <sys/resource.h>
59: #include <sys/wait.h>
60:
61: #include <netinet/in.h>
62: #include <netinet/in_systm.h>
63: #include <netinet/ip.h>
64:
65: #include <errno.h>
66: #include <fcntl.h>
67: #include <netdb.h>
68: #include <pwd.h>
69: #include <setjmp.h>
70: #include <termios.h>
71: #include <signal.h>
72: #include <stdio.h>
73: #include <stdlib.h>
74: #include <string.h>
75: #include <unistd.h>
76:
77: #ifdef __STDC__
78: #include <stdarg.h>
79: #else
80: #include <varargs.h>
81: #endif
82:
83: #ifdef KERBEROS
1.14 provos 84: #include <des.h>
1.1 deraadt 85: #include <kerberosIV/krb.h>
86:
87: CREDENTIALS cred;
1.9 mickey 88: des_key_schedule schedule;
1.1 deraadt 89: int use_kerberos = 1, doencrypt;
90: char dst_realm_buf[REALM_SZ], *dest_realm = NULL;
1.19 ! art 91:
! 92: int des_read __P((int, char *, int));
! 93: int des_write __P((int, char *, int));
! 94:
! 95: int krcmd __P((char **, u_short, char *, char *, int *, char *));
! 96: int krcmd_mutual __P((char **, u_short, char *, char *, int *, char *,
! 97: CREDENTIALS *, Key_schedule));
1.1 deraadt 98: #endif
99:
100: #ifndef TIOCPKT_WINDOW
101: #define TIOCPKT_WINDOW 0x80
102: #endif
103:
104: /* concession to Sun */
105: #ifndef SIGUSR1
106: #define SIGUSR1 30
107: #endif
108:
109: #ifndef CCEQ
110: #define CCEQ(val, c) (c == val ? val != _POSIX_VDISABLE : 0)
111: #endif
112:
113: int eight, rem;
114: struct termios deftty;
115:
116: int noescape;
117: u_char escapechar = '~';
118:
119: #ifdef OLDSUN
120: struct winsize {
121: unsigned short ws_row, ws_col;
122: unsigned short ws_xpixel, ws_ypixel;
123: };
124: #else
125: #define get_window_size(fd, wp) ioctl(fd, TIOCGWINSZ, wp)
126: #endif
127: struct winsize winsize;
128:
129: void catch_child __P((int));
130: void copytochild __P((int));
1.13 deraadt 131: __dead void doit __P((int));
1.1 deraadt 132: __dead void done __P((int));
133: void echo __P((char));
134: u_int getescape __P((char *));
135: void lostpeer __P((int));
136: void mode __P((int));
137: void msg __P((char *));
138: void oob __P((int));
139: int reader __P((int));
140: void sendwindow __P((void));
141: void setsignal __P((int));
142: void sigwinch __P((int));
143: void stop __P((int));
144: __dead void usage __P((void));
145: void writer __P((void));
146: void writeroob __P((int));
147:
148: #ifdef KERBEROS
149: void warning __P((const char *, ...));
1.9 mickey 150: void desrw_set_key __P((des_cblock *, des_key_schedule *));
1.1 deraadt 151: #endif
152: #ifdef OLDSUN
153: int get_window_size __P((int, struct winsize *));
154: #endif
155:
156: int
157: main(argc, argv)
158: int argc;
159: char *argv[];
160: {
161: extern char *optarg;
162: extern int optind;
163: struct passwd *pw;
164: struct servent *sp;
165: struct termios tty;
1.13 deraadt 166: int omask;
1.1 deraadt 167: int argoff, ch, dflag, one, uid;
1.5 deraadt 168: char *host, *p, *user, term[64];
1.1 deraadt 169:
170: argoff = dflag = 0;
171: one = 1;
172: host = user = NULL;
173:
1.17 deraadt 174: if ((p = strrchr(argv[0], '/')))
1.1 deraadt 175: ++p;
176: else
177: p = argv[0];
178:
179: if (strcmp(p, "rlogin"))
180: host = p;
181:
182: /* handle "rlogin host flags" */
183: if (!host && argc > 2 && argv[1][0] != '-') {
184: host = argv[1];
185: argoff = 1;
186: }
187:
188: #ifdef KERBEROS
189: #define OPTIONS "8EKLde:k:l:x"
190: #else
191: #define OPTIONS "8EKLde:l:"
192: #endif
1.11 millert 193: while ((ch = getopt(argc - argoff, argv + argoff, OPTIONS)) != -1)
1.1 deraadt 194: switch(ch) {
195: case '8':
196: eight = 1;
197: break;
198: case 'E':
199: noescape = 1;
200: break;
201: case 'K':
202: #ifdef KERBEROS
203: use_kerberos = 0;
204: #endif
205: break;
206: case 'd':
207: dflag = 1;
208: break;
209: case 'e':
210: noescape = 0;
211: escapechar = getescape(optarg);
212: break;
213: #ifdef KERBEROS
214: case 'k':
215: dest_realm = dst_realm_buf;
216: (void)strncpy(dest_realm, optarg, REALM_SZ);
217: break;
218: #endif
219: case 'l':
220: user = optarg;
221: break;
222: #ifdef KERBEROS
223: case 'x':
224: doencrypt = 1;
1.9 mickey 225: desrw_set_key(&cred.session, &schedule);
1.1 deraadt 226: break;
227: #endif
228: case '?':
229: default:
230: usage();
231: }
232: optind += argoff;
233: argc -= optind;
234: argv += optind;
235:
236: /* if haven't gotten a host yet, do so */
237: if (!host && !(host = *argv++))
238: usage();
239:
240: if (*argv)
241: usage();
242:
243: if (!(pw = getpwuid(uid = getuid()))) {
244: (void)fprintf(stderr, "rlogin: unknown user id.\n");
245: exit(1);
246: }
247: if (!user)
248: user = pw->pw_name;
249:
250: sp = NULL;
251: #ifdef KERBEROS
252: if (use_kerberos) {
253: sp = getservbyname((doencrypt ? "eklogin" : "klogin"), "tcp");
254: if (sp == NULL) {
255: use_kerberos = 0;
256: warning("can't get entry for %s/tcp service",
257: doencrypt ? "eklogin" : "klogin");
258: }
259: }
260: #endif
261: if (sp == NULL)
262: sp = getservbyname("login", "tcp");
263: if (sp == NULL) {
264: (void)fprintf(stderr, "rlogin: login/tcp: unknown service.\n");
265: exit(1);
266: }
267:
1.4 deraadt 268: (void)strncpy(term, (p = getenv("TERM")) ? p : "network",
269: sizeof(term) - 1);
270: term[sizeof(term) - 1] = '\0';
271:
272: /*
273: * Add "/baud" only if there is room left; ie. do not send "/19"
274: * for 19200 baud with a particularily long $TERM
275: */
1.1 deraadt 276: if (tcgetattr(0, &tty) == 0) {
1.4 deraadt 277: char baud[20]; /* more than enough.. */
278:
279: (void)sprintf(baud, "/%d", cfgetospeed(&tty));
280: if (strlen(term) + strlen(baud) < sizeof(term) - 1)
281: (void)strcat(term, baud);
1.1 deraadt 282: }
283:
284: (void)get_window_size(0, &winsize);
285:
286: (void)signal(SIGPIPE, lostpeer);
287: /* will use SIGUSR1 for window size hack, so hold it off */
288: omask = sigblock(sigmask(SIGURG) | sigmask(SIGUSR1));
289: /*
290: * We set SIGURG and SIGUSR1 below so that an
291: * incoming signal will be held pending rather than being
292: * discarded. Note that these routines will be ready to get
293: * a signal by the time that they are unblocked below.
294: */
295: (void)signal(SIGURG, copytochild);
296: (void)signal(SIGUSR1, writeroob);
297:
298: #ifdef KERBEROS
299: try_connect:
300: if (use_kerberos) {
301: struct hostent *hp;
302:
303: /* Fully qualify hostname (needed for krb_realmofhost). */
304: hp = gethostbyname(host);
305: if (hp != NULL && !(host = strdup(hp->h_name))) {
306: (void)fprintf(stderr, "rlogin: %s\n",
307: strerror(ENOMEM));
308: exit(1);
309: }
310:
311: rem = KSUCCESS;
312: errno = 0;
313: if (dest_realm == NULL)
314: dest_realm = krb_realmofhost(host);
315:
316: if (doencrypt)
317: rem = krcmd_mutual(&host, sp->s_port, user, term, 0,
318: dest_realm, &cred, schedule);
319: else
320: rem = krcmd(&host, sp->s_port, user, term, 0,
321: dest_realm);
322: if (rem < 0) {
323: use_kerberos = 0;
324: sp = getservbyname("login", "tcp");
325: if (sp == NULL) {
326: (void)fprintf(stderr,
327: "rlogin: unknown service login/tcp.\n");
328: exit(1);
329: }
330: if (errno == ECONNREFUSED)
331: warning("remote host doesn't support Kerberos");
332: if (errno == ENOENT)
333: warning("can't provide Kerberos auth data");
334: goto try_connect;
335: }
336: } else {
337: if (doencrypt) {
338: (void)fprintf(stderr,
339: "rlogin: the -x flag requires Kerberos authentication.\n");
340: exit(1);
341: }
342: rem = rcmd(&host, sp->s_port, pw->pw_name, user, term, 0);
343: }
344: #else
345: rem = rcmd(&host, sp->s_port, pw->pw_name, user, term, 0);
346: #endif /* KERBEROS */
347:
348: if (rem < 0)
349: exit(1);
350:
351: if (dflag &&
352: setsockopt(rem, SOL_SOCKET, SO_DEBUG, &one, sizeof(one)) < 0)
353: (void)fprintf(stderr, "rlogin: setsockopt: %s.\n",
354: strerror(errno));
355: one = IPTOS_LOWDELAY;
356: if (setsockopt(rem, IPPROTO_IP, IP_TOS, (char *)&one, sizeof(int)) < 0)
357: perror("rlogin: setsockopt TOS (ignored)");
358:
1.10 tholo 359: (void)seteuid(uid);
1.1 deraadt 360: (void)setuid(uid);
361: doit(omask);
362: /*NOTREACHED*/
1.19 ! art 363:
! 364: return 0;
1.1 deraadt 365: }
366:
1.17 deraadt 367: pid_t child;
1.1 deraadt 368:
369: void
370: doit(omask)
1.13 deraadt 371: int omask;
1.1 deraadt 372: {
1.17 deraadt 373: struct sigaction sa;
1.1 deraadt 374:
375: (void)signal(SIGINT, SIG_IGN);
376: setsignal(SIGHUP);
377: setsignal(SIGQUIT);
378: mode(1);
379: child = fork();
380: if (child == -1) {
381: (void)fprintf(stderr, "rlogin: fork: %s.\n", strerror(errno));
382: done(1);
383: }
384: if (child == 0) {
1.17 deraadt 385: (void)signal(SIGCHLD, SIG_DFL);
1.1 deraadt 386: if (reader(omask) == 0) {
387: msg("connection closed.");
388: exit(0);
389: }
390: sleep(1);
1.17 deraadt 391:
1.18 kstailey 392: msg("\aconnection closed.");
393: exit(1);
394: }
395:
1.17 deraadt 396: /*
397: * Use sigaction() instead of signal() to avoid getting SIGCHLDs
398: * for stopped children.
399: */
400: sigemptyset(&sa.sa_mask);
401: sa.sa_flags = SA_RESTART | SA_NOCLDSTOP;
402: sa.sa_handler = catch_child;
403: (void)sigaction(SIGCHLD, &sa, NULL);
1.1 deraadt 404:
405: /*
406: * We may still own the socket, and may have a pending SIGURG (or might
407: * receive one soon) that we really want to send to the reader. When
408: * one of these comes in, the trap copytochild simply copies such
409: * signals to the child. We can now unblock SIGURG and SIGUSR1
410: * that were set above.
411: */
412: (void)sigsetmask(omask);
413: writer();
414: msg("closed connection.");
415: done(0);
416: }
417:
418: /* trap a signal, unless it is being ignored. */
419: void
420: setsignal(sig)
421: int sig;
422: {
423: int omask = sigblock(sigmask(sig));
424:
425: if (signal(sig, exit) == SIG_IGN)
426: (void)signal(sig, SIG_IGN);
427: (void)sigsetmask(omask);
428: }
429:
430: __dead void
431: done(status)
432: int status;
433: {
434: int w, wstatus;
435:
436: mode(0);
437: if (child > 0) {
438: /* make sure catch_child does not snap it up */
439: (void)signal(SIGCHLD, SIG_DFL);
440: if (kill(child, SIGKILL) >= 0)
1.17 deraadt 441: while ((w = wait(&wstatus)) > 0 && w != child)
442: ;
1.1 deraadt 443: }
444: exit(status);
445: }
446:
447: int dosigwinch;
448:
449: /*
450: * This is called when the reader process gets the out-of-band (urgent)
451: * request to turn on the window-changing protocol.
452: */
453: void
454: writeroob(signo)
455: int signo;
456: {
457: if (dosigwinch == 0) {
458: sendwindow();
459: (void)signal(SIGWINCH, sigwinch);
460: }
461: dosigwinch = 1;
462: }
463:
464: void
465: catch_child(signo)
466: int signo;
467: {
1.16 deraadt 468: int save_errno = errno;
1.17 deraadt 469: int status;
470: pid_t pid;
1.1 deraadt 471:
472: for (;;) {
1.17 deraadt 473: pid = wait3(&status, WNOHANG, NULL);
1.1 deraadt 474: if (pid == 0)
1.16 deraadt 475: break;
1.1 deraadt 476: /* if the child (reader) dies, just quit */
1.17 deraadt 477: if (pid == child && !WIFSTOPPED(status)) {
478: child = -1;
479: if (WIFEXITED(status))
480: done(WEXITSTATUS(status));
481: done(WTERMSIG(status));
482: }
1.1 deraadt 483: }
1.16 deraadt 484: errno = save_errno;
1.1 deraadt 485: }
486:
487: /*
488: * writer: write to remote: 0 -> line.
489: * ~. terminate
490: * ~^Z suspend rlogin process.
491: * ~<delayed-suspend char> suspend rlogin process, but leave reader alone.
492: */
493: void
494: writer()
495: {
496: register int bol, local, n;
497: char c;
498:
499: bol = 1; /* beginning of line */
500: local = 0;
501: for (;;) {
502: n = read(STDIN_FILENO, &c, 1);
503: if (n <= 0) {
504: if (n < 0 && errno == EINTR)
505: continue;
506: break;
507: }
508: /*
509: * If we're at the beginning of the line and recognize a
510: * command character, then we echo locally. Otherwise,
511: * characters are echo'd remotely. If the command character
512: * is doubled, this acts as a force and local echo is
513: * suppressed.
514: */
515: if (bol) {
516: bol = 0;
517: if (!noescape && c == escapechar) {
518: local = 1;
519: continue;
520: }
521: } else if (local) {
522: local = 0;
523: if (c == '.' || CCEQ(deftty.c_cc[VEOF], c)) {
524: echo(c);
525: break;
526: }
527: if (CCEQ(deftty.c_cc[VSUSP], c)) {
528: bol = 1;
529: echo(c);
530: stop(1);
531: continue;
532: }
533: if (CCEQ(deftty.c_cc[VDSUSP], c)) {
534: bol = 1;
535: echo(c);
536: stop(0);
537: continue;
538: }
1.19 ! art 539: if (c != escapechar) {
1.1 deraadt 540: #ifdef KERBEROS
541: if (doencrypt)
542: (void)des_write(rem,
543: (char *)&escapechar, 1);
544: else
545: #endif
546: (void)write(rem, &escapechar, 1);
1.19 ! art 547: }
1.1 deraadt 548: }
549:
550: #ifdef KERBEROS
551: if (doencrypt) {
552: if (des_write(rem, &c, 1) == 0) {
553: msg("line gone");
554: break;
555: }
556: } else
557: #endif
558: if (write(rem, &c, 1) == 0) {
559: msg("line gone");
560: break;
561: }
562: bol = CCEQ(deftty.c_cc[VKILL], c) ||
563: CCEQ(deftty.c_cc[VEOF], c) ||
564: CCEQ(deftty.c_cc[VINTR], c) ||
565: CCEQ(deftty.c_cc[VSUSP], c) ||
566: c == '\r' || c == '\n';
567: }
568: }
569:
570: void
1.15 mickey 571: #ifdef __STDC__
1.1 deraadt 572: echo(register char c)
573: #else
574: echo(c)
575: register char c;
576: #endif
577: {
578: register char *p;
579: char buf[8];
580:
581: p = buf;
582: c &= 0177;
583: *p++ = escapechar;
584: if (c < ' ') {
585: *p++ = '^';
586: *p++ = c + '@';
587: } else if (c == 0177) {
588: *p++ = '^';
589: *p++ = '?';
590: } else
591: *p++ = c;
592: *p++ = '\r';
593: *p++ = '\n';
594: (void)write(STDOUT_FILENO, buf, p - buf);
595: }
596:
597: void
598: stop(all)
599: int all;
600: {
601: mode(0);
602: (void)kill(all ? 0 : getpid(), SIGTSTP);
603: mode(1);
604: sigwinch(0); /* check for size changes */
605: }
606:
607: void
608: sigwinch(signo)
609: int signo;
610: {
611: struct winsize ws;
612:
613: if (dosigwinch && get_window_size(0, &ws) == 0 &&
614: bcmp(&ws, &winsize, sizeof(ws))) {
615: winsize = ws;
616: sendwindow();
617: }
618: }
619:
620: /*
621: * Send the window size to the server via the magic escape
622: */
623: void
624: sendwindow()
625: {
626: struct winsize *wp;
627: char obuf[4 + sizeof (struct winsize)];
628:
629: wp = (struct winsize *)(obuf+4);
630: obuf[0] = 0377;
631: obuf[1] = 0377;
632: obuf[2] = 's';
633: obuf[3] = 's';
634: wp->ws_row = htons(winsize.ws_row);
635: wp->ws_col = htons(winsize.ws_col);
636: wp->ws_xpixel = htons(winsize.ws_xpixel);
637: wp->ws_ypixel = htons(winsize.ws_ypixel);
638:
639: #ifdef KERBEROS
640: if(doencrypt)
641: (void)des_write(rem, obuf, sizeof(obuf));
642: else
643: #endif
644: (void)write(rem, obuf, sizeof(obuf));
645: }
646:
647: /*
648: * reader: read from remote: line -> 1
649: */
650: #define READING 1
651: #define WRITING 2
652:
653: jmp_buf rcvtop;
1.17 deraadt 654: pid_t ppid;
655: int rcvcnt, rcvstate;
1.1 deraadt 656: char rcvbuf[8 * 1024];
657:
658: void
659: oob(signo)
660: int signo;
661: {
662: struct termios tty;
663: int atmark, n, rcvd;
1.16 deraadt 664: int save_errno = errno;
1.1 deraadt 665: char waste[BUFSIZ], mark;
666:
667: rcvd = 0;
668: while (recv(rem, &mark, 1, MSG_OOB) < 0) {
669: switch (errno) {
670: case EWOULDBLOCK:
671: /*
672: * Urgent data not here yet. It may not be possible
673: * to send it yet if we are blocked for output and
674: * our input buffer is full.
675: */
676: if (rcvcnt < sizeof(rcvbuf)) {
677: n = read(rem, rcvbuf + rcvcnt,
678: sizeof(rcvbuf) - rcvcnt);
1.16 deraadt 679: if (n <= 0) {
680: errno = save_errno;
1.1 deraadt 681: return;
1.16 deraadt 682: }
1.1 deraadt 683: rcvd += n;
684: } else {
685: n = read(rem, waste, sizeof(waste));
1.16 deraadt 686: if (n <= 0) {
687: errno = save_errno;
1.1 deraadt 688: return;
1.16 deraadt 689: }
1.1 deraadt 690: }
691: continue;
692: default:
1.16 deraadt 693: errno = save_errno;
1.1 deraadt 694: return;
695: }
696: }
697: if (mark & TIOCPKT_WINDOW) {
698: /* Let server know about window size changes */
699: (void)kill(ppid, SIGUSR1);
700: }
701: if (!eight && (mark & TIOCPKT_NOSTOP)) {
702: (void)tcgetattr(0, &tty);
703: tty.c_iflag &= ~IXON;
704: (void)tcsetattr(0, TCSANOW, &tty);
705: }
706: if (!eight && (mark & TIOCPKT_DOSTOP)) {
707: (void)tcgetattr(0, &tty);
708: tty.c_iflag |= (deftty.c_iflag & IXON);
709: (void)tcsetattr(0, TCSANOW, &tty);
710: }
711: if (mark & TIOCPKT_FLUSHWRITE) {
712: (void)tcflush(1, TCIOFLUSH);
713: for (;;) {
714: if (ioctl(rem, SIOCATMARK, &atmark) < 0) {
715: (void)fprintf(stderr, "rlogin: ioctl: %s.\n",
716: strerror(errno));
717: break;
718: }
719: if (atmark)
720: break;
721: n = read(rem, waste, sizeof (waste));
722: if (n <= 0)
723: break;
724: }
725: /*
726: * Don't want any pending data to be output, so clear the recv
727: * buffer. If we were hanging on a write when interrupted,
728: * don't want it to restart. If we were reading, restart
729: * anyway.
730: */
731: rcvcnt = 0;
732: longjmp(rcvtop, 1);
733: }
734:
735: /* oob does not do FLUSHREAD (alas!) */
736:
737: /*
738: * If we filled the receive buffer while a read was pending, longjmp
739: * to the top to restart appropriately. Don't abort a pending write,
740: * however, or we won't know how much was written.
741: */
742: if (rcvd && rcvstate == READING)
743: longjmp(rcvtop, 1);
1.16 deraadt 744: errno = save_errno;
1.1 deraadt 745: }
746:
747: /* reader: read from remote: line -> 1 */
748: int
749: reader(omask)
750: int omask;
751: {
1.17 deraadt 752: pid_t pid;
753: int n, remaining;
1.1 deraadt 754: char *bufp;
755:
756: #if BSD >= 43 || defined(SUNOS4)
757: pid = getpid(); /* modern systems use positives for pid */
758: #else
759: pid = -getpid(); /* old broken systems use negatives */
760: #endif
761: (void)signal(SIGTTOU, SIG_IGN);
762: (void)signal(SIGURG, oob);
763: ppid = getppid();
764: (void)fcntl(rem, F_SETOWN, pid);
765: (void)setjmp(rcvtop);
766: (void)sigsetmask(omask);
767: bufp = rcvbuf;
768: for (;;) {
769: while ((remaining = rcvcnt - (bufp - rcvbuf)) > 0) {
770: rcvstate = WRITING;
771: n = write(STDOUT_FILENO, bufp, remaining);
772: if (n < 0) {
773: if (errno != EINTR)
774: return (-1);
775: continue;
776: }
777: bufp += n;
778: }
779: bufp = rcvbuf;
780: rcvcnt = 0;
781: rcvstate = READING;
782:
783: #ifdef KERBEROS
784: if (doencrypt)
785: rcvcnt = des_read(rem, rcvbuf, sizeof(rcvbuf));
786: else
787: #endif
788: rcvcnt = read(rem, rcvbuf, sizeof (rcvbuf));
789: if (rcvcnt == 0)
790: return (0);
791: if (rcvcnt < 0) {
792: if (errno == EINTR)
793: continue;
794: (void)fprintf(stderr, "rlogin: read: %s.\n",
795: strerror(errno));
796: return (-1);
797: }
798: }
799: }
800:
801: void
802: mode(f)
803: int f;
804: {
805: struct termios tty;
806:
807: switch (f) {
808: case 0:
809: (void)tcsetattr(0, TCSANOW, &deftty);
810: break;
811: case 1:
812: (void)tcgetattr(0, &deftty);
813: tty = deftty;
814: /* This is loosely derived from sys/compat/tty_compat.c. */
815: tty.c_lflag &= ~(ECHO|ICANON|ISIG|IEXTEN);
816: tty.c_iflag &= ~ICRNL;
817: tty.c_oflag &= ~OPOST;
1.7 deraadt 818: tty.c_cc[VMIN] = 1;
819: tty.c_cc[VTIME] = 0;
1.1 deraadt 820: if (eight) {
821: tty.c_iflag &= IXOFF;
822: tty.c_cflag &= ~(CSIZE|PARENB);
823: tty.c_cflag |= CS8;
824: }
825: (void)tcsetattr(0, TCSANOW, &tty);
826: break;
827: default:
828: return;
829: }
830: }
831:
832: void
833: lostpeer(signo)
834: int signo;
835: {
836: (void)signal(SIGPIPE, SIG_IGN);
837: msg("\aconnection closed.");
838: done(1);
839: }
840:
841: /* copy SIGURGs to the child process. */
842: void
843: copytochild(signo)
844: int signo;
845: {
1.16 deraadt 846: int save_errno = errno;
1.1 deraadt 847: (void)kill(child, SIGURG);
1.16 deraadt 848: errno = save_errno;
1.1 deraadt 849: }
850:
851: void
852: msg(str)
853: char *str;
854: {
855: (void)fprintf(stderr, "rlogin: %s\r\n", str);
856: }
857:
858: #ifdef KERBEROS
859: /* VARARGS */
860: void
1.15 mickey 861: #ifdef __STDC__
1.1 deraadt 862: warning(const char *fmt, ...)
863: #else
864: warning(fmt, va_alist)
865: char *fmt;
866: va_dcl
867: #endif
868: {
1.8 tholo 869: char myrealm[REALM_SZ];
1.1 deraadt 870: va_list ap;
871:
1.8 tholo 872: if (krb_get_lrealm(myrealm, 0) != KSUCCESS)
873: return;
1.1 deraadt 874: (void)fprintf(stderr, "rlogin: warning, using standard rlogin: ");
875: #ifdef __STDC__
876: va_start(ap, fmt);
877: #else
878: va_start(ap);
879: #endif
880: vfprintf(stderr, fmt, ap);
881: va_end(ap);
882: (void)fprintf(stderr, ".\n");
883: }
884: #endif
885:
886: __dead void
887: usage()
888: {
889: (void)fprintf(stderr,
890: "usage: rlogin [ -%s]%s[-e char] [ -l username ] host\n",
891: #ifdef KERBEROS
892: "8EKLx", " [-k realm] ");
893: #else
894: "8EL", " ");
895: #endif
896: exit(1);
897: }
898:
899: /*
900: * The following routine provides compatibility (such as it is) between older
901: * Suns and others. Suns have only a `ttysize', so we convert it to a winsize.
902: */
903: #ifdef OLDSUN
904: int
905: get_window_size(fd, wp)
906: int fd;
907: struct winsize *wp;
908: {
909: struct ttysize ts;
910: int error;
911:
912: if ((error = ioctl(0, TIOCGSIZE, &ts)) != 0)
913: return (error);
914: wp->ws_row = ts.ts_lines;
915: wp->ws_col = ts.ts_cols;
916: wp->ws_xpixel = 0;
917: wp->ws_ypixel = 0;
918: return (0);
919: }
920: #endif
921:
922: u_int
923: getescape(p)
924: register char *p;
925: {
926: long val;
927: int len;
928:
929: if ((len = strlen(p)) == 1) /* use any single char, including '\' */
930: return ((u_int)*p);
931: /* otherwise, \nnn */
932: if (*p == '\\' && len >= 2 && len <= 4) {
933: val = strtol(++p, NULL, 8);
934: for (;;) {
935: if (!*++p)
936: return ((u_int)val);
937: if (*p < '0' || *p > '8')
938: break;
939: }
940: }
941: msg("illegal option value -- e");
942: usage();
943: /* NOTREACHED */
944: }