rlogin.c revision 1.5
1 /* $NetBSD: rlogin.c,v 1.5 1995/05/03 07:13:51 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 static char copyright[] = 38 "@(#) Copyright (c) 1983, 1990, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)rlogin.c 8.1 (Berkeley) 6/6/93"; 45 #else 46 static char rcsid[] = "$NetBSD: rlogin.c,v 1.5 1995/05/03 07:13:51 mycroft Exp $"; 47 #endif 48 #endif /* not lint */ 49 50 /* 51 * rlogin - remote login 52 */ 53 #include <sys/param.h> 54 #include <sys/ioctl.h> 55 #include <sys/socket.h> 56 #include <sys/time.h> 57 #include <sys/resource.h> 58 #include <sys/wait.h> 59 60 #include <netinet/in.h> 61 #include <netinet/in_systm.h> 62 #include <netinet/ip.h> 63 64 #include <errno.h> 65 #include <fcntl.h> 66 #include <netdb.h> 67 #include <pwd.h> 68 #include <setjmp.h> 69 #include <termios.h> 70 #include <signal.h> 71 #include <stdio.h> 72 #include <stdlib.h> 73 #include <string.h> 74 #include <unistd.h> 75 76 #ifdef __STDC__ 77 #include <stdarg.h> 78 #else 79 #include <varargs.h> 80 #endif 81 82 #ifdef KERBEROS 83 #include <kerberosIV/des.h> 84 #include <kerberosIV/krb.h> 85 86 #include "krb.h" 87 88 CREDENTIALS cred; 89 Key_schedule schedule; 90 int use_kerberos = 1, doencrypt; 91 char dst_realm_buf[REALM_SZ], *dest_realm = NULL; 92 #endif 93 94 #ifndef TIOCPKT_WINDOW 95 #define TIOCPKT_WINDOW 0x80 96 #endif 97 98 /* concession to Sun */ 99 #ifndef SIGUSR1 100 #define SIGUSR1 30 101 #endif 102 103 #ifndef CCEQ 104 #define CCEQ(val, c) (c == val ? val != _POSIX_VDISABLE : 0) 105 #endif 106 107 int eight, rem; 108 struct termios deftty; 109 110 int noescape; 111 u_char escapechar = '~'; 112 113 #ifdef OLDSUN 114 struct winsize { 115 unsigned short ws_row, ws_col; 116 unsigned short ws_xpixel, ws_ypixel; 117 }; 118 #else 119 #define get_window_size(fd, wp) ioctl(fd, TIOCGWINSZ, wp) 120 #endif 121 struct winsize winsize; 122 123 void catch_child __P((int)); 124 void copytochild __P((int)); 125 __dead void doit __P((long)); 126 __dead void done __P((int)); 127 void echo __P((char)); 128 u_int getescape __P((char *)); 129 void lostpeer __P((int)); 130 void mode __P((int)); 131 void msg __P((char *)); 132 void oob __P((int)); 133 int reader __P((int)); 134 void sendwindow __P((void)); 135 void setsignal __P((int)); 136 void sigwinch __P((int)); 137 void stop __P((char)); 138 __dead void usage __P((void)); 139 void writer __P((void)); 140 void writeroob __P((int)); 141 142 #ifdef KERBEROS 143 void warning __P((const char *, ...)); 144 #endif 145 #ifdef OLDSUN 146 int get_window_size __P((int, struct winsize *)); 147 #endif 148 149 int 150 main(argc, argv) 151 int argc; 152 char *argv[]; 153 { 154 extern char *optarg; 155 extern int optind; 156 struct passwd *pw; 157 struct servent *sp; 158 struct termios tty; 159 long omask; 160 int argoff, ch, dflag, one, uid; 161 char *host, *p, *user, term[1024]; 162 163 argoff = dflag = 0; 164 one = 1; 165 host = user = NULL; 166 167 if (p = rindex(argv[0], '/')) 168 ++p; 169 else 170 p = argv[0]; 171 172 if (strcmp(p, "rlogin")) 173 host = p; 174 175 /* handle "rlogin host flags" */ 176 if (!host && argc > 2 && argv[1][0] != '-') { 177 host = argv[1]; 178 argoff = 1; 179 } 180 181 #ifdef KERBEROS 182 #define OPTIONS "8EKLde:k:l:x" 183 #else 184 #define OPTIONS "8EKLde:l:" 185 #endif 186 while ((ch = getopt(argc - argoff, argv + argoff, OPTIONS)) != EOF) 187 switch(ch) { 188 case '8': 189 eight = 1; 190 break; 191 case 'E': 192 noescape = 1; 193 break; 194 case 'K': 195 #ifdef KERBEROS 196 use_kerberos = 0; 197 #endif 198 break; 199 case 'd': 200 dflag = 1; 201 break; 202 case 'e': 203 noescape = 0; 204 escapechar = getescape(optarg); 205 break; 206 #ifdef KERBEROS 207 case 'k': 208 dest_realm = dst_realm_buf; 209 (void)strncpy(dest_realm, optarg, REALM_SZ); 210 break; 211 #endif 212 case 'l': 213 user = optarg; 214 break; 215 #ifdef CRYPT 216 #ifdef KERBEROS 217 case 'x': 218 doencrypt = 1; 219 des_set_key(cred.session, schedule); 220 break; 221 #endif 222 #endif 223 case '?': 224 default: 225 usage(); 226 } 227 optind += argoff; 228 argc -= optind; 229 argv += optind; 230 231 /* if haven't gotten a host yet, do so */ 232 if (!host && !(host = *argv++)) 233 usage(); 234 235 if (*argv) 236 usage(); 237 238 if (!(pw = getpwuid(uid = getuid()))) { 239 (void)fprintf(stderr, "rlogin: unknown user id.\n"); 240 exit(1); 241 } 242 if (!user) 243 user = pw->pw_name; 244 245 sp = NULL; 246 #ifdef KERBEROS 247 if (use_kerberos) { 248 sp = getservbyname((doencrypt ? "eklogin" : "klogin"), "tcp"); 249 if (sp == NULL) { 250 use_kerberos = 0; 251 warning("can't get entry for %s/tcp service", 252 doencrypt ? "eklogin" : "klogin"); 253 } 254 } 255 #endif 256 if (sp == NULL) 257 sp = getservbyname("login", "tcp"); 258 if (sp == NULL) { 259 (void)fprintf(stderr, "rlogin: login/tcp: unknown service.\n"); 260 exit(1); 261 } 262 263 (void)strcpy(term, (p = getenv("TERM")) ? p : "network"); 264 if (tcgetattr(0, &tty) == 0) { 265 (void)strcat(term, "/"); 266 (void)sprintf(term + strlen(term), "%d", cfgetospeed(&tty)); 267 } 268 269 (void)get_window_size(0, &winsize); 270 271 (void)signal(SIGPIPE, lostpeer); 272 /* will use SIGUSR1 for window size hack, so hold it off */ 273 omask = sigblock(sigmask(SIGURG) | sigmask(SIGUSR1)); 274 /* 275 * We set SIGURG and SIGUSR1 below so that an 276 * incoming signal will be held pending rather than being 277 * discarded. Note that these routines will be ready to get 278 * a signal by the time that they are unblocked below. 279 */ 280 (void)signal(SIGURG, copytochild); 281 (void)signal(SIGUSR1, writeroob); 282 283 #ifdef KERBEROS 284 try_connect: 285 if (use_kerberos) { 286 struct hostent *hp; 287 288 /* Fully qualify hostname (needed for krb_realmofhost). */ 289 hp = gethostbyname(host); 290 if (hp != NULL && !(host = strdup(hp->h_name))) { 291 (void)fprintf(stderr, "rlogin: %s\n", 292 strerror(ENOMEM)); 293 exit(1); 294 } 295 296 rem = KSUCCESS; 297 errno = 0; 298 if (dest_realm == NULL) 299 dest_realm = krb_realmofhost(host); 300 301 #ifdef CRYPT 302 if (doencrypt) 303 rem = krcmd_mutual(&host, sp->s_port, user, term, 0, 304 dest_realm, &cred, schedule); 305 else 306 #endif /* CRYPT */ 307 rem = krcmd(&host, sp->s_port, user, term, 0, 308 dest_realm); 309 if (rem < 0) { 310 use_kerberos = 0; 311 sp = getservbyname("login", "tcp"); 312 if (sp == NULL) { 313 (void)fprintf(stderr, 314 "rlogin: unknown service login/tcp.\n"); 315 exit(1); 316 } 317 if (errno == ECONNREFUSED) 318 warning("remote host doesn't support Kerberos"); 319 if (errno == ENOENT) 320 warning("can't provide Kerberos auth data"); 321 goto try_connect; 322 } 323 } else { 324 #ifdef CRYPT 325 if (doencrypt) { 326 (void)fprintf(stderr, 327 "rlogin: the -x flag requires Kerberos authentication.\n"); 328 exit(1); 329 } 330 #endif /* CRYPT */ 331 rem = rcmd(&host, sp->s_port, pw->pw_name, user, term, 0); 332 } 333 #else 334 rem = rcmd(&host, sp->s_port, pw->pw_name, user, term, 0); 335 #endif /* KERBEROS */ 336 337 if (rem < 0) 338 exit(1); 339 340 if (dflag && 341 setsockopt(rem, SOL_SOCKET, SO_DEBUG, &one, sizeof(one)) < 0) 342 (void)fprintf(stderr, "rlogin: setsockopt: %s.\n", 343 strerror(errno)); 344 one = IPTOS_LOWDELAY; 345 if (setsockopt(rem, IPPROTO_IP, IP_TOS, (char *)&one, sizeof(int)) < 0) 346 perror("rlogin: setsockopt TOS (ignored)"); 347 348 (void)setuid(uid); 349 doit(omask); 350 /*NOTREACHED*/ 351 } 352 353 int child; 354 355 void 356 doit(omask) 357 long omask; 358 { 359 360 (void)signal(SIGINT, SIG_IGN); 361 setsignal(SIGHUP); 362 setsignal(SIGQUIT); 363 mode(1); 364 child = fork(); 365 if (child == -1) { 366 (void)fprintf(stderr, "rlogin: fork: %s.\n", strerror(errno)); 367 done(1); 368 } 369 if (child == 0) { 370 if (reader(omask) == 0) { 371 msg("connection closed."); 372 exit(0); 373 } 374 sleep(1); 375 msg("\aconnection closed."); 376 exit(1); 377 } 378 379 /* 380 * We may still own the socket, and may have a pending SIGURG (or might 381 * receive one soon) that we really want to send to the reader. When 382 * one of these comes in, the trap copytochild simply copies such 383 * signals to the child. We can now unblock SIGURG and SIGUSR1 384 * that were set above. 385 */ 386 (void)sigsetmask(omask); 387 (void)signal(SIGCHLD, catch_child); 388 writer(); 389 msg("closed connection."); 390 done(0); 391 } 392 393 /* trap a signal, unless it is being ignored. */ 394 void 395 setsignal(sig) 396 int sig; 397 { 398 int omask = sigblock(sigmask(sig)); 399 400 if (signal(sig, exit) == SIG_IGN) 401 (void)signal(sig, SIG_IGN); 402 (void)sigsetmask(omask); 403 } 404 405 __dead void 406 done(status) 407 int status; 408 { 409 int w, wstatus; 410 411 mode(0); 412 if (child > 0) { 413 /* make sure catch_child does not snap it up */ 414 (void)signal(SIGCHLD, SIG_DFL); 415 if (kill(child, SIGKILL) >= 0) 416 while ((w = wait(&wstatus)) > 0 && w != child); 417 } 418 exit(status); 419 } 420 421 int dosigwinch; 422 423 /* 424 * This is called when the reader process gets the out-of-band (urgent) 425 * request to turn on the window-changing protocol. 426 */ 427 void 428 writeroob(signo) 429 int signo; 430 { 431 if (dosigwinch == 0) { 432 sendwindow(); 433 (void)signal(SIGWINCH, sigwinch); 434 } 435 dosigwinch = 1; 436 } 437 438 void 439 catch_child(signo) 440 int signo; 441 { 442 union wait status; 443 int pid; 444 445 for (;;) { 446 pid = wait3((int *)&status, WNOHANG|WUNTRACED, NULL); 447 if (pid == 0) 448 return; 449 /* if the child (reader) dies, just quit */ 450 if (pid < 0 || (pid == child && !WIFSTOPPED(status))) 451 done((int)(status.w_termsig | status.w_retcode)); 452 } 453 /* NOTREACHED */ 454 } 455 456 /* 457 * writer: write to remote: 0 -> line. 458 * ~. terminate 459 * ~^Z suspend rlogin process. 460 * ~<delayed-suspend char> suspend rlogin process, but leave reader alone. 461 */ 462 void 463 writer() 464 { 465 register int bol, local, n; 466 char c; 467 468 bol = 1; /* beginning of line */ 469 local = 0; 470 for (;;) { 471 n = read(STDIN_FILENO, &c, 1); 472 if (n <= 0) { 473 if (n < 0 && errno == EINTR) 474 continue; 475 break; 476 } 477 /* 478 * If we're at the beginning of the line and recognize a 479 * command character, then we echo locally. Otherwise, 480 * characters are echo'd remotely. If the command character 481 * is doubled, this acts as a force and local echo is 482 * suppressed. 483 */ 484 if (bol) { 485 bol = 0; 486 if (!noescape && c == escapechar) { 487 local = 1; 488 continue; 489 } 490 } else if (local) { 491 local = 0; 492 if (c == '.' || CCEQ(deftty.c_cc[VEOF], c)) { 493 echo(c); 494 break; 495 } 496 if (CCEQ(deftty.c_cc[VSUSP], c) || 497 CCEQ(deftty.c_cc[VDSUSP], c)) { 498 bol = 1; 499 echo(c); 500 stop(c); 501 continue; 502 } 503 if (c != escapechar) 504 #ifdef CRYPT 505 #ifdef KERBEROS 506 if (doencrypt) 507 (void)des_write(rem, 508 (char *)&escapechar, 1); 509 else 510 #endif 511 #endif 512 (void)write(rem, &escapechar, 1); 513 } 514 515 #ifdef CRYPT 516 #ifdef KERBEROS 517 if (doencrypt) { 518 if (des_write(rem, &c, 1) == 0) { 519 msg("line gone"); 520 break; 521 } 522 } else 523 #endif 524 #endif 525 if (write(rem, &c, 1) == 0) { 526 msg("line gone"); 527 break; 528 } 529 bol = CCEQ(deftty.c_cc[VKILL], c) || 530 CCEQ(deftty.c_cc[VEOF], c) || 531 CCEQ(deftty.c_cc[VINTR], c) || 532 CCEQ(deftty.c_cc[VSUSP], c) || 533 c == '\r' || c == '\n'; 534 } 535 } 536 537 void 538 #if __STDC__ 539 echo(register char c) 540 #else 541 echo(c) 542 register char c; 543 #endif 544 { 545 register char *p; 546 char buf[8]; 547 548 p = buf; 549 c &= 0177; 550 *p++ = escapechar; 551 if (c < ' ') { 552 *p++ = '^'; 553 *p++ = c + '@'; 554 } else if (c == 0177) { 555 *p++ = '^'; 556 *p++ = '?'; 557 } else 558 *p++ = c; 559 *p++ = '\r'; 560 *p++ = '\n'; 561 (void)write(STDOUT_FILENO, buf, p - buf); 562 } 563 564 void 565 #if __STDC__ 566 stop(char cmdc) 567 #else 568 stop(cmdc) 569 char cmdc; 570 #endif 571 { 572 mode(0); 573 (void)signal(SIGCHLD, SIG_IGN); 574 (void)kill(CCEQ(deftty.c_cc[VSUSP], cmdc) ? 0 : getpid(), SIGTSTP); 575 (void)signal(SIGCHLD, catch_child); 576 mode(1); 577 sigwinch(0); /* check for size changes */ 578 } 579 580 void 581 sigwinch(signo) 582 int signo; 583 { 584 struct winsize ws; 585 586 if (dosigwinch && get_window_size(0, &ws) == 0 && 587 bcmp(&ws, &winsize, sizeof(ws))) { 588 winsize = ws; 589 sendwindow(); 590 } 591 } 592 593 /* 594 * Send the window size to the server via the magic escape 595 */ 596 void 597 sendwindow() 598 { 599 struct winsize *wp; 600 char obuf[4 + sizeof (struct winsize)]; 601 602 wp = (struct winsize *)(obuf+4); 603 obuf[0] = 0377; 604 obuf[1] = 0377; 605 obuf[2] = 's'; 606 obuf[3] = 's'; 607 wp->ws_row = htons(winsize.ws_row); 608 wp->ws_col = htons(winsize.ws_col); 609 wp->ws_xpixel = htons(winsize.ws_xpixel); 610 wp->ws_ypixel = htons(winsize.ws_ypixel); 611 612 #ifdef CRYPT 613 #ifdef KERBEROS 614 if(doencrypt) 615 (void)des_write(rem, obuf, sizeof(obuf)); 616 else 617 #endif 618 #endif 619 (void)write(rem, obuf, sizeof(obuf)); 620 } 621 622 /* 623 * reader: read from remote: line -> 1 624 */ 625 #define READING 1 626 #define WRITING 2 627 628 jmp_buf rcvtop; 629 int ppid, rcvcnt, rcvstate; 630 char rcvbuf[8 * 1024]; 631 632 void 633 oob(signo) 634 int signo; 635 { 636 struct termios tty; 637 int atmark, n, out, rcvd; 638 char waste[BUFSIZ], mark; 639 640 out = O_RDWR; 641 rcvd = 0; 642 while (recv(rem, &mark, 1, MSG_OOB) < 0) { 643 switch (errno) { 644 case EWOULDBLOCK: 645 /* 646 * Urgent data not here yet. It may not be possible 647 * to send it yet if we are blocked for output and 648 * our input buffer is full. 649 */ 650 if (rcvcnt < sizeof(rcvbuf)) { 651 n = read(rem, rcvbuf + rcvcnt, 652 sizeof(rcvbuf) - rcvcnt); 653 if (n <= 0) 654 return; 655 rcvd += n; 656 } else { 657 n = read(rem, waste, sizeof(waste)); 658 if (n <= 0) 659 return; 660 } 661 continue; 662 default: 663 return; 664 } 665 } 666 if (mark & TIOCPKT_WINDOW) { 667 /* Let server know about window size changes */ 668 (void)kill(ppid, SIGUSR1); 669 } 670 if (!eight && (mark & TIOCPKT_NOSTOP)) { 671 (void)tcgetattr(0, &tty); 672 tty.c_iflag &= ~IXON; 673 (void)tcsetattr(0, TCSANOW, &tty); 674 } 675 if (!eight && (mark & TIOCPKT_DOSTOP)) { 676 (void)tcgetattr(0, &tty); 677 tty.c_iflag |= (deftty.c_iflag & IXON); 678 (void)tcsetattr(0, TCSANOW, &tty); 679 } 680 if (mark & TIOCPKT_FLUSHWRITE) { 681 (void)ioctl(1, TIOCFLUSH, (char *)&out); 682 for (;;) { 683 if (ioctl(rem, SIOCATMARK, &atmark) < 0) { 684 (void)fprintf(stderr, "rlogin: ioctl: %s.\n", 685 strerror(errno)); 686 break; 687 } 688 if (atmark) 689 break; 690 n = read(rem, waste, sizeof (waste)); 691 if (n <= 0) 692 break; 693 } 694 /* 695 * Don't want any pending data to be output, so clear the recv 696 * buffer. If we were hanging on a write when interrupted, 697 * don't want it to restart. If we were reading, restart 698 * anyway. 699 */ 700 rcvcnt = 0; 701 longjmp(rcvtop, 1); 702 } 703 704 /* oob does not do FLUSHREAD (alas!) */ 705 706 /* 707 * If we filled the receive buffer while a read was pending, longjmp 708 * to the top to restart appropriately. Don't abort a pending write, 709 * however, or we won't know how much was written. 710 */ 711 if (rcvd && rcvstate == READING) 712 longjmp(rcvtop, 1); 713 } 714 715 /* reader: read from remote: line -> 1 */ 716 int 717 reader(omask) 718 int omask; 719 { 720 int pid, n, remaining; 721 char *bufp; 722 723 #if BSD >= 43 || defined(SUNOS4) 724 pid = getpid(); /* modern systems use positives for pid */ 725 #else 726 pid = -getpid(); /* old broken systems use negatives */ 727 #endif 728 (void)signal(SIGTTOU, SIG_IGN); 729 (void)signal(SIGURG, oob); 730 ppid = getppid(); 731 (void)fcntl(rem, F_SETOWN, pid); 732 (void)setjmp(rcvtop); 733 (void)sigsetmask(omask); 734 bufp = rcvbuf; 735 for (;;) { 736 while ((remaining = rcvcnt - (bufp - rcvbuf)) > 0) { 737 rcvstate = WRITING; 738 n = write(STDOUT_FILENO, bufp, remaining); 739 if (n < 0) { 740 if (errno != EINTR) 741 return (-1); 742 continue; 743 } 744 bufp += n; 745 } 746 bufp = rcvbuf; 747 rcvcnt = 0; 748 rcvstate = READING; 749 750 #ifdef CRYPT 751 #ifdef KERBEROS 752 if (doencrypt) 753 rcvcnt = des_read(rem, rcvbuf, sizeof(rcvbuf)); 754 else 755 #endif 756 #endif 757 rcvcnt = read(rem, rcvbuf, sizeof (rcvbuf)); 758 if (rcvcnt == 0) 759 return (0); 760 if (rcvcnt < 0) { 761 if (errno == EINTR) 762 continue; 763 (void)fprintf(stderr, "rlogin: read: %s.\n", 764 strerror(errno)); 765 return (-1); 766 } 767 } 768 } 769 770 void 771 mode(f) 772 int f; 773 { 774 struct termios tty; 775 776 switch (f) { 777 case 0: 778 (void)tcsetattr(0, TCSANOW, &deftty); 779 break; 780 case 1: 781 (void)tcgetattr(0, &deftty); 782 tty = deftty; 783 /* This is derived from sys/compat/tty_compat.c. */ 784 tty.c_lflag &= ~(ECHO|ICANON); 785 tty.c_iflag &= ~ICRNL; 786 tty.c_oflag &= ~OPOST; 787 if (eight) { 788 tty.c_lflag &= ~(ISIG|IEXTEN); 789 tty.c_iflag &= IXOFF; 790 tty.c_cflag &= ~(CSIZE|PARENB); 791 tty.c_cflag |= CS8; 792 } 793 (void)tcsetattr(0, TCSANOW, &tty); 794 break; 795 default: 796 return; 797 } 798 } 799 800 void 801 lostpeer(signo) 802 int signo; 803 { 804 (void)signal(SIGPIPE, SIG_IGN); 805 msg("\aconnection closed."); 806 done(1); 807 } 808 809 /* copy SIGURGs to the child process. */ 810 void 811 copytochild(signo) 812 int signo; 813 { 814 (void)kill(child, SIGURG); 815 } 816 817 void 818 msg(str) 819 char *str; 820 { 821 (void)fprintf(stderr, "rlogin: %s\r\n", str); 822 } 823 824 #ifdef KERBEROS 825 /* VARARGS */ 826 void 827 #if __STDC__ 828 warning(const char *fmt, ...) 829 #else 830 warning(fmt, va_alist) 831 char *fmt; 832 va_dcl 833 #endif 834 { 835 va_list ap; 836 837 (void)fprintf(stderr, "rlogin: warning, using standard rlogin: "); 838 #ifdef __STDC__ 839 va_start(ap, fmt); 840 #else 841 va_start(ap); 842 #endif 843 vfprintf(stderr, fmt, ap); 844 va_end(ap); 845 (void)fprintf(stderr, ".\n"); 846 } 847 #endif 848 849 __dead void 850 usage() 851 { 852 (void)fprintf(stderr, 853 "usage: rlogin [ -%s]%s[-e char] [ -l username ] host\n", 854 #ifdef KERBEROS 855 #ifdef CRYPT 856 "8EKLx", " [-k realm] "); 857 #else 858 "8EKL", " [-k realm] "); 859 #endif 860 #else 861 "8EL", " "); 862 #endif 863 exit(1); 864 } 865 866 /* 867 * The following routine provides compatibility (such as it is) between older 868 * Suns and others. Suns have only a `ttysize', so we convert it to a winsize. 869 */ 870 #ifdef OLDSUN 871 int 872 get_window_size(fd, wp) 873 int fd; 874 struct winsize *wp; 875 { 876 struct ttysize ts; 877 int error; 878 879 if ((error = ioctl(0, TIOCGSIZE, &ts)) != 0) 880 return (error); 881 wp->ws_row = ts.ts_lines; 882 wp->ws_col = ts.ts_cols; 883 wp->ws_xpixel = 0; 884 wp->ws_ypixel = 0; 885 return (0); 886 } 887 #endif 888 889 u_int 890 getescape(p) 891 register char *p; 892 { 893 long val; 894 int len; 895 896 if ((len = strlen(p)) == 1) /* use any single char, including '\' */ 897 return ((u_int)*p); 898 /* otherwise, \nnn */ 899 if (*p == '\\' && len >= 2 && len <= 4) { 900 val = strtol(++p, NULL, 8); 901 for (;;) { 902 if (!*++p) 903 return ((u_int)val); 904 if (*p < '0' || *p > '8') 905 break; 906 } 907 } 908 msg("illegal option value -- e"); 909 usage(); 910 /* NOTREACHED */ 911 } 912
Indexes created Thu Oct 23 22:10:10 GMT 2025