source: trunk/minix/commands/simple/rlogin.c@ 9

Last change on this file since 9 was 9, checked in by Mattia Monga, 13 years ago

Minix 3.1.2a
File size: 32.7 KB
Line 
1/*
2 * Copyright (c) 1983, 1990 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
35char copyright[] =
36"@(#) Copyright (c) 1983, 1990 The Regents of the University of California.\n\
37 All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#ifdef ID
42static char sccsid[] = "@(#)rlogin.c 5.33 (Berkeley) 3/1/91";
43#endif
44#endif /* not lint */
45
46/*
47 * $Source: /cvsup/minix/src/commands/simple/rlogin.c,v $
48 * $Header: mit/rlogin/RCS/rlogin.c,v 5.2 89/07/26 12:11:21 kfall
49 * Exp Locker: kfall $
50 */
51
52/*
53 * rlogin - remote login
54 */
55#include <sys/ioctl.h>
56#include <sys/types.h>
57#include <sys/wait.h>
58
59#include <net/netlib.h>
60#include <net/hton.h>
61#include <net/gen/in.h>
62#include <net/gen/netdb.h>
63#include <net/gen/tcp.h>
64#include <net/gen/tcp_io.h>
65
66#include <termios.h>
67#include <setjmp.h>
68#include <errno.h>
69#include <pwd.h>
70#include <stdio.h>
71#include <unistd.h>
72#include <string.h>
73#include <assert.h>
74#include <ctype.h>
75#include <fcntl.h>
76#include <signal.h>
77#include <stdlib.h>
78
79#ifdef KERBEROS
80#include <kerberosIV/des.h>
81#include <kerberosIV/krb.h>
82
83CREDENTIALS cred;
84Key_schedule schedule;
85int use_kerberos = 1, doencrypt;
86char dst_realm_buf[REALM_SZ], *dest_realm = NULL;
87extern char *krb_realmofhost();
88#endif
89
90#ifndef TIOCPKT_WINDOW
91#define TIOCPKT_WINDOW 0x80
92#endif
93
94/* concession to Sun */
95#ifndef SIGUSR1
96#define SIGUSR1 30
97#endif
98
99extern int errno;
100int eight, litout, rem;
101
102int noescape;
103u_char escapechar = '~';
104
105struct speed
106{
107 speed_t speed;
108 char *name;
109} speeds[] = {
110 { B0, "0" }, { B50, "50" }, { B75, "75" }, { B110, "110" },
111 { B134, "134" }, { B150, "150" }, { B200, "200" }, { B300, "300" },
112 { B600, "600" }, { B1200, "1200" }, { B1800, "1800" },
113 { B2400, "2400" }, { B4800, "4800" }, { B9600, "9600" },
114 { B19200, "19200" }, { B38400, "38400" }, { B57600, "57600" },
115 { B115200, "115200" },
116 { -1, NULL },
117};
118
119#if __minix_vmd
120/* flow control variables */
121int more2read_0;
122int inprogress_0;
123int more2write_1;
124int inprogress_1;
125int more2read_rem;
126int inprogress_rd_rem;
127int more2write_rem;
128int inprogress_wr_rem;
129
130/* write to remote */
131size_t wr_rem_size;
132size_t wr_rem_offset;
133size_t extra_wr_rem_size;
134size_t extra_wr_rem_offset;
135char *extra_wr_rem;
136size_t extra_wr_rem_new_size;
137char *extra_wr_rem_new;
138
139#endif /* __minix_vmd */
140
141struct winsize winsize;
142
143#define get_window_size(fd, wp) ioctl(fd, TIOCGWINSZ, wp)
144
145extern int main _ARGS(( int argc, char **argv ));
146static void usage _ARGS(( void ));
147static u_char getescape _ARGS(( char *p ));
148static char *speeds2str _ARGS(( speed_t speed ));
149static void lostpeer _ARGS(( int sig ));
150static void doit _ARGS(( void ));
151static void setsignal _ARGS(( int sig, void (*act)(int sig) ));
152static void msg _ARGS(( char *str ));
153static void done _ARGS(( int status ));
154#if !__minix_vmd
155static int reader _ARGS(( void ));
156#endif
157static void mode _ARGS(( int f ));
158#if __minix_vmd
159static void mark_async _ARGS(( int fd ));
160static void init_0 _ARGS(( void ));
161static void init_1 _ARGS(( void ));
162static void init_rd_rem _ARGS(( void ));
163static void init_wr_rem _ARGS(( void ));
164static void restart_0 _ARGS(( void ));
165static void restart_1 _ARGS(( void ));
166static void restart_rd_rem _ARGS(( void ));
167static void restart_wr_rem _ARGS(( void ));
168static void completed_0 _ARGS(( int result, int error ));
169static void completed_1 _ARGS(( int result, int error ));
170static void completed_rd_rem _ARGS(( int result, int error ));
171static void completed_wr_rem _ARGS(( int result, int error ));
172static void do_urg _ARGS(( int urg_byte ));
173#endif
174#if !__minix_vmd
175static void catch_child _ARGS(( int sig ));
176static void writer _ARGS(( void ));
177#endif
178static void echo _ARGS(( int c ));
179#if __minix_vmd
180static void finish _ARGS(( void ));
181static void sendwindow _ARGS(( void ));
182static void sigwinch _ARGS(( int sig ));
183static void subshell _ARGS(( void ));
184#endif
185
186int main(argc, argv)
187 int argc;
188 char **argv;
189{
190 extern char *optarg;
191 extern int optind;
192 struct passwd *pw;
193 struct servent *sp;
194 struct termios ttyb;
195 nwio_tcpopt_t tcpopt;
196 int error;
197 int argoff, ch, dflag, one, uid;
198 char *host, *p, *user, term[1024];
199
200 argoff = dflag = 0;
201 one = 1;
202 host = user = NULL;
203
204 if (p = rindex(argv[0], '/'))
205 ++p;
206 else
207 p = argv[0];
208
209 if (strcmp(p, "rlogin"))
210 host = p;
211
212 /* handle "rlogin host flags" */
213 if (!host && argc > 2 && argv[1][0] != '-') {
214 host = argv[1];
215 argoff = 1;
216 }
217
218#ifdef KERBEROS
219#define OPTIONS "8EKLde:k:l:x"
220#else
221#define OPTIONS "8EKLde:l:"
222#endif
223 while ((ch = getopt(argc - argoff, argv + argoff, OPTIONS)) != EOF)
224 switch(ch) {
225 case '8':
226 eight = 1;
227 break;
228 case 'E':
229 noescape = 1;
230 break;
231 case 'K':
232#ifdef KERBEROS
233 use_kerberos = 0;
234#endif
235 break;
236 case 'L':
237 litout = 1;
238 break;
239 case 'd':
240 dflag = 1;
241 break;
242 case 'e':
243 escapechar = getescape(optarg);
244 break;
245#ifdef KERBEROS
246 case 'k':
247 dest_realm = dst_realm_buf;
248 (void)strncpy(dest_realm, optarg, REALM_SZ);
249 break;
250#endif
251 case 'l':
252 user = optarg;
253 break;
254#ifdef CRYPT
255#ifdef KERBEROS
256 case 'x':
257 doencrypt = 1;
258 des_set_key(cred.session, schedule);
259 break;
260#endif
261#endif
262 case '?':
263 default:
264 usage();
265 }
266 optind += argoff;
267 argc -= optind;
268 argv += optind;
269
270 /* if haven't gotten a host yet, do so */
271 if (!host && !(host = *argv++))
272 usage();
273
274 if (*argv)
275 usage();
276
277 if (!(pw = getpwuid(uid = getuid()))) {
278 (void)fprintf(stderr, "rlogin: unknown user id.\n");
279 exit(1);
280 }
281 if (!user)
282 user = pw->pw_name;
283
284 sp = NULL;
285#ifdef KERBEROS
286 if (use_kerberos) {
287 sp = getservbyname((doencrypt ? "eklogin" : "klogin"), "tcp");
288 if (sp == NULL) {
289 use_kerberos = 0;
290 warning("can't get entry for %s/tcp service",
291 doencrypt ? "eklogin" : "klogin");
292 }
293 }
294#endif
295 if (sp == NULL)
296 sp = getservbyname("login", "tcp");
297 if (sp == NULL) {
298 (void)fprintf(stderr, "rlogin: login/tcp: unknown service.\n");
299 exit(1);
300 }
301
302 (void)strncpy(term, (p = getenv("TERM")) ? p : "network", sizeof(term));
303 term[sizeof(term)-1]= 0;
304
305 if (tcgetattr(0, &ttyb) == 0) {
306 (void)strcat(term, "/");
307 (void)strcat(term, speeds2str(cfgetospeed(&ttyb)));
308 }
309
310 (void)get_window_size(0, &winsize);
311
312 (void)signal(SIGPIPE, lostpeer);
313
314#ifdef KERBEROS
315try_connect:
316 if (use_kerberos) {
317 rem = KSUCCESS;
318 errno = 0;
319 if (dest_realm == NULL)
320 dest_realm = krb_realmofhost(host);
321
322#ifdef CRYPT
323 if (doencrypt)
324 rem = krcmd_mutual(&host, sp->s_port, user, term, 0,
325 dest_realm, &cred, schedule);
326 else
327#endif /* CRYPT */
328 rem = krcmd(&host, sp->s_port, user, term, 0,
329 dest_realm);
330 if (rem < 0) {
331 use_kerberos = 0;
332 sp = getservbyname("login", "tcp");
333 if (sp == NULL) {
334 (void)fprintf(stderr,
335 "rlogin: unknown service login/tcp.\n");
336 exit(1);
337 }
338 if (errno == ECONNREFUSED)
339 warning("remote host doesn't support Kerberos");
340 if (errno == ENOENT)
341 warning("can't provide Kerberos auth data");
342 goto try_connect;
343 }
344 } else {
345#ifdef CRYPT
346 if (doencrypt) {
347 (void)fprintf(stderr,
348 "rlogin: the -x flag requires Kerberos authentication.\n");
349 exit(1);
350 }
351#endif /* CRYPT */
352 rem = rcmd(&host, sp->s_port, pw->pw_name, user, term, 0);
353 }
354#else
355 rem = rcmd(&host, sp->s_port, pw->pw_name, user, term, 0);
356#endif /* KERBEROS */
357
358 if (rem < 0)
359 exit(1);
360
361 /* Enable BSD compatibility for urgent data. */
362 tcpopt.nwto_flags= NWTO_BSD_URG;
363 error= ioctl(rem, NWIOSTCPOPT, &tcpopt);
364 if (error == -1)
365 {
366 fprintf(stderr, "rlogin: NWIOSTCPOPT failed: %s\n",
367 strerror(errno));
368 }
369
370 (void)setuid(uid);
371 doit();
372 /*NOTREACHED*/
373}
374
375struct termios defattr, rawattr;
376#if __minix_vmd
377int mustsendwindow;
378#else
379int child;
380#endif
381
382static void
383doit()
384{
385 struct termios sb;
386#if !__minix_vmd
387 int r;
388#else
389 asio_fd_set_t fd_set;
390 struct fwait fw;
391 int result;
392#endif
393
394 (void)tcgetattr(0, &sb);
395 defattr = sb;
396 rawattr = sb;
397
398 rawattr.c_iflag &= ~(ICRNL | IGNCR | INLCR | ISTRIP | IXOFF | IXON |
399 PARMRK | IXANY);
400 rawattr.c_oflag &= ~(OPOST);
401 rawattr.c_lflag &= ~(ECHONL | ECHO | ICANON | IEXTEN | ISIG);
402
403 (void)signal(SIGINT, SIG_IGN);
404 setsignal(SIGHUP, exit);
405 setsignal(SIGQUIT, exit);
406
407#if !__minix_vmd
408 child = fork();
409 if (child == -1) {
410 (void)fprintf(stderr, "rlogin: fork: %s.\n", strerror(errno));
411 done(1);
412 }
413 if (child == 0) {
414 mode(1);
415 r = reader();
416 if (r == 0) {
417 msg("connection closed.");
418 exit(0);
419 }
420 sleep(1);
421 msg("\007connection closed.");
422 exit(1);
423 }
424
425 (void)signal(SIGCHLD, catch_child);
426 writer();
427
428#else /* __minix_vmd */
429
430 mode(1);
431 /* mark the file descriptors 0, 1, and rem as asynchronous. */
432 mark_async(0);
433 mark_async(1);
434 mark_async(rem);
435 init_0();
436 init_1();
437 init_rd_rem();
438 init_wr_rem();
439
440 for (;;)
441 {
442 ASIO_FD_ZERO(&fd_set);
443 fw.fw_flags= 0;
444 fw.fw_bits= fd_set.afds_bits;
445 fw.fw_maxfd= ASIO_FD_SETSIZE;
446
447 if (more2read_0 && !inprogress_0)
448 {
449 restart_0();
450 fw.fw_flags |= FWF_NONBLOCK;
451 }
452
453 if (more2write_1 && !inprogress_1)
454 {
455 restart_1();
456 fw.fw_flags |= FWF_NONBLOCK;
457 }
458
459 if (more2read_rem && !inprogress_rd_rem)
460 {
461 restart_rd_rem();
462 fw.fw_flags |= FWF_NONBLOCK;
463 }
464
465 if (more2write_rem && !inprogress_wr_rem)
466 {
467 restart_wr_rem();
468 fw.fw_flags |= FWF_NONBLOCK;
469 }
470
471 if (more2read_0 && inprogress_0)
472 ASIO_FD_SET(0, ASIO_READ, &fd_set);
473 if (more2write_1 && inprogress_1)
474 ASIO_FD_SET(1, ASIO_WRITE, &fd_set);
475 if (more2read_rem && inprogress_rd_rem)
476 ASIO_FD_SET(rem, ASIO_READ, &fd_set);
477 if (more2write_rem && inprogress_wr_rem)
478 ASIO_FD_SET(rem, ASIO_WRITE, &fd_set);
479
480 for (;;)
481 {
482 result= fwait(&fw);
483 if (result == -1 && (errno == EAGAIN ||
484 errno == EINTR))
485 {
486 break;
487 }
488 if (result == -1)
489 {
490 fprintf(stderr, "fwait failed (%s)\n",
491 strerror(errno));
492 exit(1);
493 }
494 assert(result == 0);
495#if 0
496printf("fwait: fw_fw= %d, fw_operation= %d, fw_result= %d, fw.fw_errno= %d\n",
497 fw.fw_fd, fw.fw_operation, fw.fw_result, fw.fw_errno);
498#endif
499 if (fw.fw_fd == 0 && fw.fw_operation == ASIO_READ)
500 {
501 completed_0(fw.fw_result, fw.fw_errno);
502 }
503 else if (fw.fw_fd == 1 &&
504 fw.fw_operation == ASIO_WRITE)
505 {
506 completed_1(fw.fw_result, fw.fw_errno);
507 }
508 else if (fw.fw_fd == rem &&
509 fw.fw_operation == ASIO_READ)
510 {
511 completed_rd_rem(fw.fw_result, fw.fw_errno);
512 }
513 else if (fw.fw_fd == rem &&
514 fw.fw_operation == ASIO_WRITE)
515 {
516 completed_wr_rem(fw.fw_result, fw.fw_errno);
517 }
518 else
519 {
520 fprintf(stderr,
521 "strange result from fwait: fd= %d, operation= %d\n",
522 fw.fw_fd, fw.fw_operation);
523 exit(1);
524 }
525 if (!(fw.fw_flags & FWF_MORE))
526 break;
527 }
528 if (mustsendwindow)
529 {
530 mustsendwindow= 0;
531 sendwindow();
532 }
533 }
534#endif /* __minix_vmd */
535 msg("connection closed.");
536 done(0);
537}
538
539/* trap a signal, unless it is being ignored. */
540static void
541setsignal(sig, act)
542 int sig;
543 void (*act) _ARGS(( int sig ));
544{
545 if (signal(sig, act) == SIG_IGN)
546 (void)signal(sig, SIG_IGN);
547}
548
549static void
550done(status)
551 int status;
552{
553 int w, wstatus;
554
555 mode(0);
556#if !__minix_vmd
557 if (child > 0) {
558 /* make sure catch_child does not snap it up */
559 (void)signal(SIGCHLD, SIG_DFL);
560 if (kill(child, SIGKILL) >= 0)
561 while ((w = wait(&wstatus)) > 0 && w != child);
562 }
563#endif
564 exit(status);
565}
566
567int dosigwinch;
568#if !__minix
569void sigwinch();
570#endif
571
572#if !__minix_vmd
573static void
574catch_child(sig)
575 int sig;
576{
577 int status;
578 int pid;
579
580 for (;;) {
581 pid = waitpid(-1, &status, WNOHANG|WUNTRACED);
582 if (pid == 0)
583 return;
584 /* if the child (reader) dies, just quit */
585 if (pid < 0 || pid == child && !WIFSTOPPED(status))
586 done(WTERMSIG(status) | WEXITSTATUS(status));
587 }
588 /* NOTREACHED */
589}
590#endif
591
592#if !__minix_vmd
593/*
594 * writer: write to remote: 0 -> line.
595 * ~. terminate
596 * ~^Z suspend rlogin process.
597 * ~<delayed-suspend char> suspend rlogin process, but leave reader alone.
598 */
599static void
600writer()
601{
602 register int bol, local, n;
603 u_char ch;
604 int c;
605
606 bol = 1; /* beginning of line */
607 local = 0;
608 for (;;) {
609 n = read(STDIN_FILENO, &ch, 1);
610 if (n <= 0) {
611 if (n < 0 && errno == EINTR)
612 continue;
613 break;
614 }
615 c = ch;
616 /*
617 * If we're at the beginning of the line and recognize a
618 * command character, then we echo locally. Otherwise,
619 * characters are echo'd remotely. If the command character
620 * is doubled, this acts as a force and local echo is
621 * suppressed.
622 */
623 if (bol) {
624 bol = 0;
625 if (!noescape && c == escapechar) {
626 local = 1;
627 continue;
628 }
629 } else if (local) {
630 local = 0;
631 if (c == '.' || c == defattr.c_cc[VEOF]) {
632 echo(c);
633 break;
634 }
635#if !__minix
636 if (c == defattr.c_cc[VSUSP]) {
637 bol = 1;
638 echo(c);
639 stop(c);
640 continue;
641 }
642#endif
643 if (c != escapechar)
644#ifdef CRYPT
645#ifdef KERBEROS
646 if (doencrypt)
647 (void)des_write(rem, &escapechar, 1);
648 else
649#endif
650#endif
651 (void)write(rem, &escapechar, 1);
652 }
653
654 ch = c;
655#ifdef CRYPT
656#ifdef KERBEROS
657 if (doencrypt) {
658 if (des_write(rem, &ch, 1) == 0) {
659 msg("line gone");
660 break;
661 }
662 } else
663#endif
664#endif
665 if (write(rem, &ch, 1) == 0) {
666 msg("line gone");
667 break;
668 }
669 bol = c == defattr.c_cc[VKILL] ||
670 c == defattr.c_cc[VEOF] ||
671 c == defattr.c_cc[VINTR] ||
672 c == defattr.c_cc[VSUSP] ||
673 c == '\r' || c == '\n';
674 }
675}
676#endif
677
678#if !__minix_vmd
679static void
680echo(c)
681int c;
682{
683 register char *p;
684 char buf[8];
685
686 p = buf;
687 c &= 0177;
688 *p++ = escapechar;
689 if (c < ' ') {
690 *p++ = '^';
691 *p++ = c + '@';
692 } else if (c == 0177) {
693 *p++ = '^';
694 *p++ = '?';
695 } else
696 *p++ = c;
697 *p++ = '\r';
698 *p++ = '\n';
699 (void)write(STDOUT_FILENO, buf, p - buf);
700}
701#endif
702
703#if !__minix
704stop(cmdc)
705 char cmdc;
706{
707 mode(0);
708 (void)signal(SIGCHLD, SIG_IGN);
709 (void)kill(cmdc == defltc.t_suspc ? 0 : getpid(), SIGTSTP);
710 (void)signal(SIGCHLD, catch_child);
711 mode(1);
712 sigwinch(); /* check for size changes */
713}
714#endif
715
716#if __minix_vmd
717#ifdef SIGWINCH
718static void
719sigwinch(sig)
720 int sig;
721{
722 struct winsize ws;
723
724#if __minix
725 signal(SIGWINCH, sigwinch);
726#endif
727
728 if (dosigwinch && get_window_size(0, &ws) == 0 &&
729 memcmp(&ws, &winsize, sizeof(ws))) {
730 winsize = ws;
731 mustsendwindow= 1;
732 }
733}
734
735/*
736 * Send the window size to the server via the magic escape
737 */
738static void
739sendwindow()
740{
741 struct winsize *wp;
742 char *obuf, *new_buf;
743
744 new_buf= realloc(extra_wr_rem_new,
745 extra_wr_rem_new_size+4+sizeof(*wp));
746 if (new_buf == 0)
747 return;
748 extra_wr_rem_new= new_buf;
749 obuf= new_buf+extra_wr_rem_new_size;
750 extra_wr_rem_new_size += 4+sizeof(*wp);
751
752 more2read_0= 0;
753 more2write_rem= 1;
754
755 wp = (struct winsize *)(obuf+4);
756 obuf[0] = 0377;
757 obuf[1] = 0377;
758 obuf[2] = 's';
759 obuf[3] = 's';
760 wp->ws_row = htons(winsize.ws_row);
761 wp->ws_col = htons(winsize.ws_col);
762 wp->ws_xpixel = htons(winsize.ws_xpixel);
763 wp->ws_ypixel = htons(winsize.ws_ypixel);
764}
765#endif /* SIGWINCH */
766#endif
767
768#if !__minix_vmd
769/*
770 * reader: read from remote: line -> 1
771 */
772#define READING 1
773#define WRITING 2
774
775int rcvcnt, rcvstate;
776char rcvbuf[8 * 1024];
777
778static int
779reader()
780{
781 int pid = -getpid();
782 int n, remaining;
783 char *bufp = rcvbuf;
784
785 for (;;) {
786 while ((remaining = rcvcnt - (bufp - rcvbuf)) > 0) {
787 rcvstate = WRITING;
788 n = write(STDOUT_FILENO, bufp, remaining);
789 if (n < 0) {
790 if (errno != EINTR)
791 return(-1);
792 continue;
793 }
794 bufp += n;
795 }
796 bufp = rcvbuf;
797 rcvcnt = 0;
798 rcvstate = READING;
799
800#ifdef CRYPT
801#ifdef KERBEROS
802 if (doencrypt)
803 rcvcnt = des_read(rem, rcvbuf, sizeof(rcvbuf));
804 else
805#endif
806#endif
807 rcvcnt = read(rem, rcvbuf, sizeof (rcvbuf));
808 if (rcvcnt == 0)
809 return (0);
810 if (rcvcnt < 0) {
811 if (errno == EINTR)
812 continue;
813 if (errno == EURG) {
814 nwio_tcpopt_t tcpopt;
815#if DEBUG
816fprintf(stderr, "\n\rEURG\n\r");
817#endif
818 tcpopt.nwto_flags= NWTO_RCV_URG;
819 if (ioctl(rem, NWIOSTCPOPT, &tcpopt) == -1) {
820 fprintf(stderr,
821 "rlogin: trouble with urgent data: %s\n",
822 strerror(errno));
823 return(-1);
824 }
825 continue;
826 }
827 if (errno == ENOURG) {
828 nwio_tcpopt_t tcpopt;
829#if DEBUG
830fprintf(stderr, "\n\rENOURG\n\r");
831#endif
832 tcpopt.nwto_flags= NWTO_RCV_NOTURG;
833 if (ioctl(rem, NWIOSTCPOPT, &tcpopt) == -1) {
834 fprintf(stderr,
835 "rlogin: trouble with not-urgent data: %s\n",
836 strerror(errno));
837 return(-1);
838 }
839 continue;
840 }
841 (void)fprintf(stderr, "rlogin: read: %s\n",
842 strerror(errno));
843 return(-1);
844 }
845 }
846}
847#endif /* !__minix_vmd */
848
849static void
850mode(f)
851 int f;
852{
853 struct termios *sb;
854
855 switch(f) {
856 case 0:
857 sb= &defattr;
858 break;
859 case 1:
860 sb= &rawattr;
861 break;
862 default:
863 return;
864 }
865 (void)tcsetattr(0, TCSAFLUSH, sb);
866}
867
868static void
869lostpeer(sig)
870int sig;
871{
872 (void)signal(SIGPIPE, SIG_IGN);
873 msg("\007connection closed.");
874 done(1);
875}
876
877static void
878msg(str)
879 char *str;
880{
881 (void)fprintf(stderr, "rlogin: %s\r\n", str);
882}
883
884#ifdef KERBEROS
885/* VARARGS */
886warning(va_alist)
887va_dcl
888{
889 va_list ap;
890 char *fmt;
891
892 (void)fprintf(stderr, "rlogin: warning, using standard rlogin: ");
893 va_start(ap);
894 fmt = va_arg(ap, char *);
895 vfprintf(stderr, fmt, ap);
896 va_end(ap);
897 (void)fprintf(stderr, ".\n");
898}
899#endif
900
901static void
902usage()
903{
904 (void)fprintf(stderr,
905 "Usage: rlogin [-%s]%s[-e char] [-l username] host\n",
906#ifdef KERBEROS
907#ifdef CRYPT
908 "8ELx", " [-k realm] ");
909#else
910 "8EL", " [-k realm] ");
911#endif
912#else
913 "8EL", " ");
914#endif
915 exit(1);
916}
917
918/*
919 * The following routine provides compatibility (such as it is) between 4.2BSD
920 * Suns and others. Suns have only a `ttysize', so we convert it to a winsize.
921 */
922#ifdef sun
923get_window_size(fd, wp)
924 int fd;
925 struct winsize *wp;
926{
927 struct ttysize ts;
928 int error;
929
930 if ((error = ioctl(0, TIOCGSIZE, &ts)) != 0)
931 return(error);
932 wp->ws_row = ts.ts_lines;
933 wp->ws_col = ts.ts_cols;
934 wp->ws_xpixel = 0;
935 wp->ws_ypixel = 0;
936 return(0);
937}
938#endif
939
940static u_char
941getescape(p)
942 register char *p;
943{
944 long val;
945 int len;
946
947 if ((len = strlen(p)) == 1) /* use any single char, including '\' */
948 return((u_char)*p);
949 /* otherwise, \nnn */
950 if (*p == '\\' && len >= 2 && len <= 4) {
951 val = strtol(++p, (char **)NULL, 8);
952 for (;;) {
953 if (!*++p)
954 return((u_char)val);
955 if (*p < '0' || *p > '8')
956 break;
957 }
958 }
959 msg("illegal option value -- e");
960 usage();
961 /* NOTREACHED */
962}
963
964static char *
965speeds2str(speed)
966 speed_t speed;
967{
968 int i;
969 for (i= 0; speeds[i].name != NULL && speeds[i].speed != speed; i++) {
970 if (speeds[i].speed == speed) return speeds[i].name;
971 }
972 return "unknown";
973}
974
975#if __minix_vmd
976static void
977mark_async(fd)
978 int fd;
979{
980 int result;
981 int v;
982
983 result= fcntl(fd, F_GETFD);
984 if (result == -1)
985 {
986 fprintf(stderr,
987 "rlogin: mark_async: fcntl(%d, GETFD) failed (%s)\n",
988 fd, strerror(errno));
989 exit(1);
990 }
991 v= result | FD_ASYNCHIO;
992 result= fcntl(fd, F_SETFD, v);
993 if (result == -1)
994 {
995 fprintf(stderr,
996 "rlogin: mark_async: fcntl(%d, SETFD, %d) failed (%s)\n",
997 fd, v, strerror(errno));
998 exit(1);
999 }
1000}
1001
1002#define RD_0_BUFSIZE 256
1003char rd_0_buf[RD_0_BUFSIZE];
1004size_t rd_0_offset;
1005
1006static void
1007init_0()
1008{
1009 more2read_0= 1;
1010 inprogress_0= 0;
1011 rd_0_offset= 0;
1012}
1013
1014size_t wr_1_size;
1015size_t wr_1_offset;
1016char *urg_1;
1017size_t urg_1_size;
1018char *extra_1;
1019size_t extra_1_size;
1020size_t extra_1_offset;
1021char *extra_1_new;
1022size_t extra_1_new_size;
1023#define MAX_EXTRA_1_NEW_SIZE (16*1024)
1024
1025static void
1026init_1()
1027{
1028 more2write_1= 0;
1029 inprogress_1= 0;
1030 wr_1_size= 0;
1031 wr_1_offset= 0;
1032 urg_1= NULL;
1033 urg_1_size= 0;
1034 extra_1= NULL;
1035 extra_1_size= 0;
1036 extra_1_offset= 0;
1037 extra_1_new= NULL;
1038 extra_1_new_size= 0;
1039}
1040
1041#define RD_REM_BUFSIZE (8*1024)
1042char rd_rem_buf[RD_REM_BUFSIZE];
1043size_t rd_rem_offset;
1044int rd_rem_urg;
1045
1046static void
1047init_rd_rem()
1048{
1049 more2read_rem= 1;
1050 inprogress_rd_rem= 0;
1051 rd_rem_offset= 0;
1052 rd_rem_urg= 0;
1053}
1054
1055static void
1056init_wr_rem()
1057{
1058 more2write_rem= 0;
1059 inprogress_wr_rem= 0;
1060 wr_rem_size= 0;
1061 wr_rem_offset= 0;
1062 extra_wr_rem_size= 0;
1063 extra_wr_rem_offset= 0;
1064 extra_wr_rem= NULL;
1065 extra_wr_rem_new_size= 0;
1066 extra_wr_rem_new= NULL;
1067}
1068
1069static void
1070restart_0()
1071{
1072 size_t offset;
1073 int result, error;
1074
1075 assert(!inprogress_0);
1076 rd_0_offset= 1;
1077 offset= 0;
1078 while (offset < RD_0_BUFSIZE)
1079 {
1080 result= read(0, rd_0_buf+rd_0_offset+offset,
1081 RD_0_BUFSIZE-rd_0_offset-offset);
1082 if (result > 0)
1083 {
1084 offset += result;
1085 assert(rd_0_offset+offset <= RD_0_BUFSIZE);
1086 continue;
1087 }
1088 error= errno;
1089
1090 if (offset != 0)
1091 completed_0(offset, 0);
1092 rd_0_offset += offset;
1093 if (result == -1 && error == EINPROGRESS)
1094 {
1095 inprogress_0= 1;
1096 return;
1097 }
1098 completed_0(result, error);
1099 return;
1100 }
1101 completed_0(offset, 0);
1102}
1103
1104static void
1105restart_1()
1106{
1107 size_t offset;
1108 int result, error;
1109
1110 assert(!inprogress_1);
1111
1112 while (extra_1 != NULL || extra_1_new != NULL)
1113 {
1114 if (extra_1 == NULL)
1115 {
1116 extra_1= extra_1_new;
1117 extra_1_new= NULL;
1118 extra_1_size= extra_1_new_size;
1119 extra_1_new_size= 0;
1120 extra_1_offset= 0;
1121 }
1122 offset= 0;
1123#if DEBUG
1124 if (extra_1_size == 0)
1125 fprintf(stderr, "restart_1: extra_1_size= 0\n");
1126#endif
1127 while (offset < extra_1_size)
1128 {
1129 result= write(1, extra_1+extra_1_offset+offset,
1130 extra_1_size-offset);
1131 if (result > 0)
1132 {
1133 assert (result <= extra_1_size-offset);
1134 offset += result;
1135 continue;
1136 }
1137 error= errno;
1138 if (offset != 0)
1139 completed_1(offset, 0);
1140
1141 if (result == -1 && errno == EINPROGRESS)
1142 {
1143 inprogress_1= 1;
1144 return;
1145 }
1146 completed_1(result, errno);
1147 return;
1148 }
1149 completed_1(offset, 0);
1150 }
1151
1152 offset= 0;
1153
1154 if (wr_1_size == 0)
1155 {
1156 more2write_1= 0;
1157 more2read_rem= 1;
1158 return;
1159 }
1160
1161 while (offset < wr_1_size)
1162 {
1163 result= write(1, rd_rem_buf+wr_1_offset+offset,
1164 wr_1_size-offset);
1165 if (result > 0)
1166 {
1167 assert (result <= wr_1_size-offset);
1168 offset += result;
1169 continue;
1170 }
1171 error= errno;
1172 if (offset != 0)
1173 completed_1(offset, 0);
1174
1175 if (result == -1 && errno == EINPROGRESS)
1176 {
1177 inprogress_1= 1;
1178 return;
1179 }
1180 completed_1(result, errno);
1181 return;
1182 }
1183 completed_1(offset, 0);
1184}
1185
1186static void
1187restart_rd_rem()
1188{
1189 size_t offset;
1190 int result, error;
1191
1192 assert(!inprogress_rd_rem);
1193 rd_rem_offset= 0;
1194 offset= 0;
1195 while (offset < RD_REM_BUFSIZE)
1196 {
1197 result= read(rem, rd_rem_buf+offset, RD_REM_BUFSIZE-offset);
1198 if (result > 0)
1199 {
1200 offset += result;
1201 assert(offset <= RD_REM_BUFSIZE);
1202 continue;
1203 }
1204 error= errno;
1205
1206 if (offset != 0)
1207 completed_rd_rem(offset, 0);
1208 rd_rem_offset= offset;
1209 if (result == -1 && error == EINPROGRESS)
1210 {
1211 inprogress_rd_rem= 1;
1212 return;
1213 }
1214 completed_rd_rem(result, error);
1215 return;
1216 }
1217 completed_rd_rem(offset, 0);
1218}
1219
1220static void
1221restart_wr_rem()
1222{
1223 size_t offset;
1224 int result, error;
1225
1226 assert(!inprogress_wr_rem);
1227
1228 if (extra_wr_rem_new != NULL && extra_wr_rem == NULL)
1229 {
1230 extra_wr_rem= extra_wr_rem_new;
1231 extra_wr_rem_size= extra_wr_rem_new_size;
1232 extra_wr_rem_offset= 0;
1233 extra_wr_rem_new= NULL;
1234 extra_wr_rem_new_size= 0;
1235 }
1236 if (extra_wr_rem != NULL)
1237 {
1238 offset= 0;
1239 while (offset < extra_wr_rem_size)
1240 {
1241 result= write(rem,
1242 extra_wr_rem+extra_wr_rem_offset+offset,
1243 extra_wr_rem_size-offset);
1244 if (result > 0)
1245 {
1246 assert (result <= extra_wr_rem_size-offset);
1247 offset += result;
1248 continue;
1249 }
1250 error= errno;
1251 if (offset != 0)
1252 completed_wr_rem(offset, 0);
1253
1254 if (result == -1 && errno == EINPROGRESS)
1255 {
1256 inprogress_wr_rem= 1;
1257 return;
1258 }
1259 completed_wr_rem(result, errno);
1260 return;
1261 }
1262 completed_wr_rem(offset, 0);
1263 }
1264 if (wr_rem_size == 0)
1265 return;
1266
1267 offset= 0;
1268 while (offset < wr_rem_size)
1269 {
1270 result= write(rem, rd_0_buf+wr_rem_offset+offset,
1271 wr_rem_size-offset);
1272 if (result > 0)
1273 {
1274 assert (result <= wr_rem_size-offset);
1275 offset += result;
1276 continue;
1277 }
1278 error= errno;
1279 if (offset != 0)
1280 completed_wr_rem(offset, 0);
1281
1282 if (result == -1 && errno == EINPROGRESS)
1283 {
1284 inprogress_wr_rem= 1;
1285 return;
1286 }
1287 completed_wr_rem(result, errno);
1288 return;
1289 }
1290 completed_wr_rem(offset, 0);
1291}
1292
1293static void
1294completed_0(result, error)
1295 int result;
1296 int error;
1297{
1298 static int bol= 0, local= 0;
1299
1300 char *iptr, *optr;
1301 int i;
1302 u_char c;
1303
1304 inprogress_0= 0;
1305
1306 if (result > 0)
1307 {
1308 assert(rd_0_offset > 0);
1309 wr_rem_offset= 1;
1310
1311 iptr= rd_0_buf+rd_0_offset;
1312 optr= rd_0_buf+wr_rem_offset;
1313 for (i= 0; i<result; iptr++, i++)
1314 {
1315 c= *iptr;
1316 if (bol)
1317 {
1318 bol= 0;
1319 if (!noescape && c == escapechar)
1320 {
1321 local= 1;
1322 continue;
1323 }
1324 }
1325 else if (local)
1326 {
1327 local= 0;
1328 if (c == '.' || (c != _POSIX_VDISABLE &&
1329 c == defattr.c_cc[VEOF]))
1330 {
1331 echo(c);
1332 finish();
1333 /* NOTREACHED */
1334 }
1335 if (c == '!')
1336 {
1337 subshell();
1338 continue;
1339 }
1340 if (c != escapechar)
1341 {
1342 if (optr < iptr)
1343 {
1344 *(optr++)= escapechar;
1345 }
1346 else
1347 {
1348 assert(optr == iptr);
1349 assert(iptr == rd_0_buf+
1350 rd_0_offset);
1351 assert(rd_0_offset > 0);
1352 wr_rem_offset--;
1353 optr[-1]= escapechar;
1354 }
1355 }
1356 }
1357 *(optr++)= c;
1358 bol= (c != _POSIX_VDISABLE) &&
1359 (c == defattr.c_cc[VKILL] ||
1360 c == defattr.c_cc[VEOF] ||
1361 c == defattr.c_cc[VINTR] ||
1362 c == defattr.c_cc[VSUSP] ||
1363 c == '\r' || c == '\n');
1364 }
1365 wr_rem_size += optr-rd_0_buf-wr_rem_offset;
1366 if (wr_rem_size != 0)
1367 {
1368 more2read_0= 0;
1369 more2write_rem= 1;
1370 }
1371 return;
1372 } else
1373 if (result < 0) {
1374 fprintf(stderr, "rlogin: %s\n", strerror(error));
1375 }
1376 done(1);
1377}
1378
1379static void
1380completed_1(result, error)
1381 int result;
1382 int error;
1383{
1384 inprogress_1= 0;
1385
1386 if (result > 0)
1387 {
1388 if (extra_1 != NULL)
1389 {
1390 assert (result <= extra_1_size);
1391 extra_1_size -= result;
1392 extra_1_offset += result;
1393 if (extra_1_size == 0)
1394 {
1395 more2write_1= 0;
1396 more2read_rem= 1;
1397 free(extra_1);
1398 extra_1= NULL;
1399 }
1400 return;
1401 }
1402 assert (result <= wr_1_size);
1403 wr_1_size -= result;
1404 wr_1_offset += result;
1405 if (wr_1_size == 0)
1406 {
1407 more2write_1= 0;
1408 more2read_rem= 1;
1409 }
1410 return;
1411 } else
1412 if (result < 0) {
1413 fprintf(stderr, "rlogin: %s\n", strerror(error));
1414 }
1415 done(1);
1416}
1417
1418static void
1419completed_rd_rem(result, error)
1420 int result;
1421 int error;
1422{
1423 nwio_tcpopt_t tcpopt;
1424 char *new_buf;
1425 size_t keep_size;
1426 u_char urg_byte;
1427 int i;
1428
1429 inprogress_rd_rem= 0;
1430
1431 if (result > 0)
1432 {
1433 if (rd_rem_urg)
1434 {
1435#if DEBUG
1436fprintf(stderr, "\n\r%d urg bytes\n\r", result);
1437#endif
1438 if (urg_1_size > MAX_EXTRA_1_NEW_SIZE)
1439 {
1440 keep_size= MAX_EXTRA_1_NEW_SIZE/2;
1441 memmove(urg_1, urg_1+urg_1_size-keep_size,
1442 keep_size);
1443 urg_1_size= keep_size;
1444 }
1445 new_buf= realloc(urg_1, urg_1_size+result);
1446 if (new_buf == NULL)
1447 {
1448 fprintf(stderr,
1449 "rlogin: warning realloc %d failed\n",
1450 urg_1_size+result);
1451 return;
1452 }
1453 memcpy(new_buf+urg_1_size,
1454 rd_rem_buf+rd_rem_offset, result);
1455 urg_1= new_buf;
1456 urg_1_size += result;
1457 return;
1458 }
1459 more2read_rem= 0;
1460 more2write_1= 1;
1461 wr_1_size= result;
1462 wr_1_offset= rd_rem_offset;
1463 return;
1464 }
1465 if (result == -1 && error == EURG)
1466 {
1467#if DEBUG
1468fprintf(stderr, "\n\rEURG\n\r");
1469#endif
1470 rd_rem_urg= 1;
1471 tcpopt.nwto_flags= NWTO_RCV_URG;
1472 result= ioctl(rem, NWIOSTCPOPT, &tcpopt);
1473 if (result == -1)
1474 {
1475 fprintf(stderr,
1476 "rlogin: NWIOSTCPOPT on %d failed (%s)\n",
1477 rem, strerror(errno));
1478 exit(1);
1479 }
1480 return;
1481 }
1482 if (result == -1 && error == ENOURG)
1483 {
1484#if DEBUG
1485fprintf(stderr, "\n\rENOURG\n\r");
1486#endif
1487 rd_rem_urg= 0;
1488 tcpopt.nwto_flags= NWTO_RCV_NOTURG;
1489 result= ioctl(rem, NWIOSTCPOPT, &tcpopt);
1490 if (result == -1)
1491 {
1492 fprintf(stderr,
1493 "rlogin: NWIOSTCPOPT on %d failed (%s)\n",
1494 rem, strerror(errno));
1495 exit(1);
1496 }
1497 if (urg_1_size != 0)
1498 {
1499 urg_byte= urg_1[urg_1_size-1];
1500 urg_1_size--;
1501 do_urg(urg_byte);
1502 if (urg_1_size == 0)
1503 return;
1504 if (extra_1_new_size + urg_1_size > MAX_EXTRA_1_NEW_SIZE)
1505 {
1506 extra_1_new_size= 0;
1507 free(extra_1_new);
1508 extra_1_new= NULL;
1509 }
1510 if (extra_1_new_size != 0)
1511 {
1512 new_buf= realloc(extra_1_new,
1513 extra_1_new_size+urg_1_size);
1514 if (new_buf == 0)
1515 {
1516 extra_1_new_size= 0;
1517 free(extra_1_new);
1518 extra_1_new= NULL;
1519 }
1520 else
1521 {
1522 extra_1_new= new_buf;
1523 memcpy(extra_1_new+extra_1_new_size,
1524 urg_1, urg_1_size);
1525 extra_1_new_size += urg_1_size;
1526 urg_1_size= 0;
1527 free(urg_1);
1528 urg_1= NULL;
1529 }
1530 }
1531 if (extra_1_new_size == 0)
1532 {
1533 extra_1_new_size= urg_1_size;
1534 extra_1_new= urg_1;
1535 urg_1_size= 0;
1536 urg_1= NULL;
1537 }
1538 more2read_rem= 0;
1539 more2write_1= 1;
1540 }
1541 return;
1542 }
1543 if (result == -1 && error == EINTR)
1544 {
1545 /* Never mind. */
1546 return;
1547 }
1548 if (result == 0)
1549 {
1550 msg("connection closed.");
1551 done(0);
1552 }
1553 if (result < 0) {
1554 fprintf(stderr, "rlogin: %s\n", strerror(error));
1555 }
1556 done(1);
1557}
1558
1559static void
1560completed_wr_rem(result, error)
1561 int result;
1562 int error;
1563{
1564 inprogress_wr_rem= 0;
1565
1566 if (result > 0)
1567 {
1568 if (extra_wr_rem != NULL)
1569 {
1570 assert (result <= extra_wr_rem_size);
1571 extra_wr_rem_size -= result;
1572 extra_wr_rem_offset += result;
1573 if (extra_wr_rem_size == 0)
1574 {
1575 free(extra_wr_rem);
1576 extra_wr_rem= NULL;
1577 if (wr_rem_size == 0)
1578 {
1579 more2write_rem= 0;
1580 more2read_0= 1;
1581 }
1582 }
1583 return;
1584 }
1585
1586 assert (result <= wr_rem_size);
1587 wr_rem_size -= result;
1588 wr_rem_offset += result;
1589 if (wr_rem_size == 0)
1590 {
1591 more2write_rem= 0;
1592 more2read_0= 1;
1593 }
1594 return;
1595 }
1596 if (result < 0) {
1597 fprintf(stderr, "rlogin: %s\n", strerror(error));
1598 }
1599 done(1);
1600}
1601
1602static void
1603do_urg(urg_byte)
1604 int urg_byte;
1605{
1606#if DEBUG
1607 fprintf(stderr, "rlogin: warning got urg_byte 0x%x\r\n", urg_byte);
1608#endif
1609 if (urg_byte & TIOCPKT_WINDOW)
1610 {
1611 if (dosigwinch == 0)
1612 {
1613 sendwindow();
1614 signal(SIGWINCH, sigwinch);
1615 }
1616 dosigwinch= 1;
1617 }
1618}
1619
1620static void
1621echo(c)
1622 int c;
1623{
1624 u_char c1;
1625 char *new_buf;
1626
1627 new_buf= realloc(extra_1_new, extra_1_new_size+6);
1628 if (new_buf == NULL)
1629 return;
1630 extra_1_new= new_buf;
1631 new_buf= extra_1_new+extra_1_new_size;
1632
1633 c1= escapechar;
1634 if (c1 < ' ')
1635 {
1636 *new_buf++= '^';
1637 *new_buf++= c1 + '@';
1638 }
1639 else if (c1 == 0x7f)
1640 {
1641 *new_buf++= '^';
1642 *new_buf++= '?';
1643 }
1644 else
1645 *new_buf++= c1;
1646
1647 if (c < ' ')
1648 {
1649 *new_buf++= '^';
1650 *new_buf++= c + '@';
1651 }
1652 else if (c == 0x7f)
1653 {
1654 *new_buf++= '^';
1655 *new_buf++= '?';
1656 }
1657 else
1658 *new_buf++= c;
1659
1660 *new_buf++= '\r';
1661 *new_buf++= '\n';
1662 extra_1_new_size= new_buf-extra_1_new;
1663 more2write_1= 1;
1664}
1665
1666static void
1667finish()
1668{
1669 done(0);
1670}
1671
1672static char cmdbuf[256];
1673
1674static void
1675subshell()
1676{
1677 /* Start a subshell. Based on the first character of the command,
1678 * the tcp connection will be present at fd 3 ('+'), or at
1679 * fd 0 and fd 1 ('=')
1680 */
1681 int r, pid, stat, len;
1682 char *shell, *cmd;
1683
1684 /* cancel the reads and writes that are in progress. */
1685 if (inprogress_0)
1686 {
1687 r= fcancel(0, ASIO_READ);
1688 if (r != 0) abort();
1689 }
1690 if (inprogress_1)
1691 {
1692 r= fcancel(1, ASIO_WRITE);
1693 if (r != 0) abort();
1694 }
1695 if (inprogress_rd_rem)
1696 {
1697 r= fcancel(rem, ASIO_READ);
1698 if (r != 0) abort();
1699 }
1700 if (inprogress_wr_rem)
1701 {
1702 r= fcancel(rem, ASIO_WRITE);
1703 if (r != 0) abort();
1704 }
1705
1706 mode(0);
1707
1708 pid= fork();
1709 if (pid == -1) abort();
1710 if (pid != 0)
1711 {
1712 r= waitpid(pid, &stat, 0);
1713 if (r != pid) abort();
1714
1715#if DEBUG
1716 fprintf(stderr, "stat: 0x%x\n", stat);
1717#endif
1718 mode(1);
1719 return;
1720 }
1721
1722 (void)signal(SIGINT, SIG_DFL);
1723
1724 shell= getenv("SHELL");
1725 if (shell == NULL)
1726 shell= "/bin/sh";
1727 printf("~!\ncommand [%s]: ", shell);
1728 cmd= fgets(cmdbuf, sizeof(cmdbuf), stdin);
1729 if (cmd == NULL)
1730 exit(0);
1731#if DEBUG
1732 printf("got command '%s'\n", cmd);
1733#endif
1734
1735 /* Strip the trailing newline */
1736 len= strlen(cmd);
1737 if (len > 0 && cmd[len-1] == '\n')
1738 cmd[len-1]= '\0';
1739 else
1740 printf("\n");
1741
1742 /* Skip leading white space */
1743 while (*cmd != '\0' && isspace(*cmd))
1744 cmd++;
1745
1746 if (*cmd == '+')
1747 {
1748 if (rem != 3)
1749 {
1750 dup2(rem, 3);
1751 close(rem);
1752 }
1753 cmd++;
1754 }
1755 else if (*cmd == '=')
1756 {
1757 dup2(rem, 0);
1758 dup2(rem, 1);
1759 close(rem);
1760 cmd++;
1761 }
1762 else
1763 close(rem);
1764 if (*cmd == '\0')
1765 {
1766 r= execl(shell, shell, NULL);
1767 }
1768 else
1769 {
1770 r= execl("/bin/sh", "sh", "-c", cmd, NULL);
1771 }
1772 printf("exec failed: %d, %d\n", r, errno);
1773 exit(0);
1774}
1775#endif /* __minix_vmd */
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