rshd.c revision 59748
1/*- 2 * Copyright (c) 1988, 1989, 1992, 1993, 1994 3 * The Regents of the University of California. 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 35static const char copyright[] = 36"@(#) Copyright (c) 1988, 1989, 1992, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif /* not lint */ 39 40#ifndef lint 41#if 0 42static const char sccsid[] = "@(#)rshd.c 8.2 (Berkeley) 4/6/94"; 43#endif 44static const char rcsid[] = 45 "$FreeBSD: head/libexec/rshd/rshd.c 59748 2000-04-29 12:02:00Z asmodai $"; 46#endif /* not lint */ 47 48/* 49 * remote shell server: 50 * [port]\0 51 * remuser\0 52 * locuser\0 53 * command\0 54 * data 55 */ 56#include <sys/param.h> 57#include <sys/ioctl.h> 58#include <sys/time.h> 59#include <sys/socket.h> 60 61#include <netinet/in_systm.h> 62#include <netinet/in.h> 63#include <netinet/ip.h> 64#include <netinet/tcp.h> 65#include <arpa/inet.h> 66#include <netdb.h> 67 68#include <errno.h> 69#include <fcntl.h> 70#include <libutil.h> 71#include <paths.h> 72#include <pwd.h> 73#include <signal.h> 74#include <stdio.h> 75#include <stdlib.h> 76#include <string.h> 77#include <syslog.h> 78#include <unistd.h> 79#ifdef LOGIN_CAP 80#include <login_cap.h> 81#endif 82 83/* wrapper for KAME-special getnameinfo() */ 84#ifndef NI_WITHSCOPEID 85#define NI_WITHSCOPEID 0 86#endif 87 88int keepalive = 1; 89int log_success; /* If TRUE, log all successful accesses */ 90int sent_null; 91int no_delay; 92#ifdef CRYPT 93int doencrypt = 0; 94#endif 95 96union sockunion { 97 struct sockinet { 98 u_char si_len; 99 u_char si_family; 100 u_short si_port; 101 } su_si; 102 struct sockaddr_in su_sin; 103 struct sockaddr_in6 su_sin6; 104}; 105#define su_len su_si.si_len 106#define su_family su_si.si_family 107#define su_port su_si.si_port 108 109void doit __P((union sockunion *)); 110void error __P((const char *, ...)); 111void getstr __P((char *, int, char *)); 112int local_domain __P((char *)); 113char *topdomain __P((char *)); 114void usage __P((void)); 115 116#ifndef NO_PAM 117extern int auth_pam __P((char *)); 118#endif 119 120#define OPTIONS "alnDL" 121 122int 123main(argc, argv) 124 int argc; 125 char *argv[]; 126{ 127 extern int __check_rhosts_file; 128 struct linger linger; 129 int ch, on = 1, fromlen; 130 struct sockaddr_storage from; 131 132 openlog("rshd", LOG_PID | LOG_ODELAY, LOG_DAEMON); 133 134 opterr = 0; 135 while ((ch = getopt(argc, argv, OPTIONS)) != -1) 136 switch (ch) { 137 case 'a': 138 /* ignored for compatability */ 139 break; 140 case 'l': 141 __check_rhosts_file = 0; 142 break; 143 case 'n': 144 keepalive = 0; 145 break; 146#ifdef CRYPT 147 case 'x': 148 doencrypt = 1; 149 break; 150#endif 151 case 'D': 152 no_delay = 1; 153 break; 154 case 'L': 155 log_success = 1; 156 break; 157 case '?': 158 default: 159 usage(); 160 break; 161 } 162 163 argc -= optind; 164 argv += optind; 165 166#ifdef CRYPT 167 if (doencrypt) { 168 syslog(LOG_ERR, "-k is required for -x"); 169 exit(2); 170 } 171#endif 172 173 fromlen = sizeof (from); 174 if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0) { 175 syslog(LOG_ERR, "getpeername: %m"); 176 exit(1); 177 } 178 if (keepalive && 179 setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&on, 180 sizeof(on)) < 0) 181 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 182 linger.l_onoff = 1; 183 linger.l_linger = 60; /* XXX */ 184 if (setsockopt(0, SOL_SOCKET, SO_LINGER, (char *)&linger, 185 sizeof (linger)) < 0) 186 syslog(LOG_WARNING, "setsockopt (SO_LINGER): %m"); 187 if (no_delay && 188 setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 189 syslog(LOG_WARNING, "setsockopt (TCP_NODELAY): %m"); 190 doit((union sockunion *)&from); 191 /* NOTREACHED */ 192 return(0); 193} 194 195char username[20] = "USER="; 196char homedir[64] = "HOME="; 197char shell[64] = "SHELL="; 198char path[100] = "PATH="; 199char *envinit[] = 200 {homedir, shell, path, username, 0}; 201char **environ; 202 203void 204doit(fromp) 205 union sockunion *fromp; 206{ 207 extern char *__rcmd_errstr; /* syslog hook from libc/net/rcmd.c. */ 208 struct passwd *pwd; 209 u_short port; 210 fd_set ready, readfrom; 211 int cc, nfd, pv[2], pid, s; 212 int one = 1; 213 char *errorstr; 214 char *cp, sig, buf[BUFSIZ]; 215 char cmdbuf[NCARGS+1], locuser[16], remuser[16]; 216 char fromhost[2 * MAXHOSTNAMELEN + 1]; 217 char numericname[INET6_ADDRSTRLEN]; 218 int af = fromp->su_family, err; 219 int retval; 220#ifdef CRYPT 221 int rc; 222 int pv1[2], pv2[2]; 223#endif 224#ifdef LOGIN_CAP 225 login_cap_t *lc; 226#endif 227 228 (void) signal(SIGINT, SIG_DFL); 229 (void) signal(SIGQUIT, SIG_DFL); 230 (void) signal(SIGTERM, SIG_DFL); 231 fromp->su_port = ntohs((u_short)fromp->su_port); 232 if (af != AF_INET 233#ifdef INET6 234 && af != AF_INET6 235#endif 236 ) { 237 syslog(LOG_ERR, "malformed \"from\" address (af %d)\n", af); 238 exit(1); 239 } 240 err = getnameinfo((struct sockaddr *)fromp, fromp->su_len, numericname, 241 sizeof(numericname), NULL, 0, 242 NI_NUMERICHOST|NI_WITHSCOPEID); 243 /* XXX: do 'err' check */ 244#ifdef IP_OPTIONS 245 if (af == AF_INET) { 246 u_char optbuf[BUFSIZ/3]; 247 int optsize = sizeof(optbuf), ipproto, i; 248 struct protoent *ip; 249 250 if ((ip = getprotobyname("ip")) != NULL) 251 ipproto = ip->p_proto; 252 else 253 ipproto = IPPROTO_IP; 254 if (!getsockopt(0, ipproto, IP_OPTIONS, (char *)optbuf, &optsize) && 255 optsize != 0) { 256 for (i = 0; i < optsize; ) { 257 u_char c = optbuf[i]; 258 if (c == IPOPT_LSRR || c == IPOPT_SSRR) { 259 syslog(LOG_NOTICE, 260 "connection refused from %s with IP option %s", 261 numericname, 262 c == IPOPT_LSRR ? "LSRR" : "SSRR"); 263 exit(1); 264 } 265 if (c == IPOPT_EOL) 266 break; 267 i += (c == IPOPT_NOP) ? 1 : optbuf[i+1]; 268 } 269 } 270 } 271#endif 272 273 if (fromp->su_port >= IPPORT_RESERVED || 274 fromp->su_port < IPPORT_RESERVED/2) { 275 syslog(LOG_NOTICE|LOG_AUTH, 276 "connection from %s on illegal port %u", 277 numericname, 278 fromp->su_port); 279 exit(1); 280 } 281 282 (void) alarm(60); 283 port = 0; 284 s = 0; /* not set or used if port == 0 */ 285 for (;;) { 286 char c; 287 if ((cc = read(STDIN_FILENO, &c, 1)) != 1) { 288 if (cc < 0) 289 syslog(LOG_NOTICE, "read: %m"); 290 shutdown(0, 1+1); 291 exit(1); 292 } 293 if (c == 0) 294 break; 295 port = port * 10 + c - '0'; 296 } 297 298 (void) alarm(0); 299 if (port != 0) { 300 int lport = IPPORT_RESERVED - 1; 301 s = rresvport_af(&lport, af); 302 if (s < 0) { 303 syslog(LOG_ERR, "can't get stderr port: %m"); 304 exit(1); 305 } 306 if (port >= IPPORT_RESERVED || 307 port < IPPORT_RESERVED/2) { 308 syslog(LOG_NOTICE|LOG_AUTH, 309 "2nd socket from %s on unreserved port %u", 310 numericname, 311 port); 312 exit(1); 313 } 314 fromp->su_port = htons(port); 315 if (connect(s, (struct sockaddr *)fromp, fromp->su_len) < 0) { 316 syslog(LOG_INFO, "connect second port %d: %m", port); 317 exit(1); 318 } 319 } 320 321 errorstr = NULL; 322 realhostname_sa(fromhost, sizeof(fromhost) - 1, 323 (struct sockaddr *)fromp, 324 fromp->su_len); 325 fromhost[sizeof(fromhost) - 1] = '\0'; 326 327#ifdef CRYPT 328 if (doencrypt && af == AF_INET) { 329 struct sockaddr_in local_addr; 330 rc = sizeof(local_addr); 331 if (getsockname(0, (struct sockaddr *)&local_addr, 332 &rc) < 0) { 333 syslog(LOG_ERR, "getsockname: %m"); 334 error("rlogind: getsockname: %m"); 335 exit(1); 336 } 337 authopts = KOPT_DO_MUTUAL; 338 rc = krb_recvauth(authopts, 0, ticket, 339 "rcmd", instance, &fromaddr, 340 &local_addr, kdata, "", schedule, 341 version); 342 des_set_key(&kdata->session, schedule); 343 } 344#endif 345 getstr(remuser, sizeof(remuser), "remuser"); 346 347 getstr(locuser, sizeof(locuser), "locuser"); 348 getstr(cmdbuf, sizeof(cmdbuf), "command"); 349 setpwent(); 350 pwd = getpwnam(locuser); 351 if (pwd == NULL) { 352 syslog(LOG_INFO|LOG_AUTH, 353 "%s@%s as %s: unknown login. cmd='%.80s'", 354 remuser, fromhost, locuser, cmdbuf); 355 if (errorstr == NULL) 356 errorstr = "Login incorrect.\n"; 357 goto fail; 358 } 359#ifdef LOGIN_CAP 360 lc = login_getpwclass(pwd); 361#endif 362 if (chdir(pwd->pw_dir) < 0) { 363#ifdef LOGIN_CAP 364 if (chdir("/") < 0 || 365 login_getcapbool(lc, "requirehome", !!pwd->pw_uid)) { 366 syslog(LOG_INFO|LOG_AUTH, 367 "%s@%s as %s: no home directory. cmd='%.80s'", 368 remuser, fromhost, locuser, cmdbuf); 369 error("No remote home directory.\n"); 370 exit(0); 371 } 372#else 373 (void) chdir("/"); 374#ifdef notdef 375 syslog(LOG_INFO|LOG_AUTH, 376 "%s@%s as %s: no home directory. cmd='%.80s'", 377 remuser, fromhost, locuser, cmdbuf); 378 error("No remote directory.\n"); 379 exit(1); 380#endif 381#endif 382 pwd->pw_dir = "/"; 383 } 384 385#ifndef NO_PAM 386 retval = auth_pam(locuser); 387 388 if (retval) { 389 if (retval == -1) { 390 syslog(LOG_ERR,"PAM authentication failed"); 391 } 392 else { 393 syslog(LOG_ERR, 394 "User %s failed PAM authentication", locuser); 395 exit(1); 396 } 397 } 398#endif 399 400 if (errorstr || 401 (pwd->pw_expire && time(NULL) >= pwd->pw_expire) || 402 (pwd->pw_passwd != 0 && *pwd->pw_passwd != '\0' && 403 iruserok_sa(fromp, fromp->su_len, pwd->pw_uid == 0, 404 remuser, locuser) < 0)) { 405 if (__rcmd_errstr) 406 syslog(LOG_INFO|LOG_AUTH, 407 "%s@%s as %s: permission denied (%s). cmd='%.80s'", 408 remuser, fromhost, locuser, __rcmd_errstr, 409 cmdbuf); 410 else 411 syslog(LOG_INFO|LOG_AUTH, 412 "%s@%s as %s: permission denied. cmd='%.80s'", 413 remuser, fromhost, locuser, cmdbuf); 414fail: 415 if (errorstr == NULL) 416 errorstr = "Login incorrect.\n"; 417 error(errorstr, fromhost); 418 exit(1); 419 } 420 421 if (pwd->pw_uid && !access(_PATH_NOLOGIN, F_OK)) { 422 error("Logins currently disabled.\n"); 423 exit(1); 424 } 425#ifdef LOGIN_CAP 426 if (lc != NULL && fromp->su_family == AF_INET) { /*XXX*/ 427 char remote_ip[MAXHOSTNAMELEN]; 428 429 strncpy(remote_ip, numericname, 430 sizeof(remote_ip) - 1); 431 remote_ip[sizeof(remote_ip) - 1] = 0; 432 if (!auth_hostok(lc, fromhost, remote_ip)) { 433 syslog(LOG_INFO|LOG_AUTH, 434 "%s@%s as %s: permission denied (%s). cmd='%.80s'", 435 remuser, fromhost, locuser, __rcmd_errstr, 436 cmdbuf); 437 error("Login incorrect.\n"); 438 exit(1); 439 } 440 if (!auth_timeok(lc, time(NULL))) { 441 error("Logins not available right now\n"); 442 exit(1); 443 } 444 } 445#endif /* !LOGIN_CAP */ 446#if BSD > 43 447 /* before fork, while we're session leader */ 448 if (setlogin(pwd->pw_name) < 0) 449 syslog(LOG_ERR, "setlogin() failed: %m"); 450#endif 451 452 (void) write(STDERR_FILENO, "\0", 1); 453 sent_null = 1; 454 455 if (port) { 456 if (pipe(pv) < 0) { 457 error("Can't make pipe.\n"); 458 exit(1); 459 } 460#ifdef CRYPT 461 if (doencrypt) { 462 if (pipe(pv1) < 0) { 463 error("Can't make 2nd pipe.\n"); 464 exit(1); 465 } 466 if (pipe(pv2) < 0) { 467 error("Can't make 3rd pipe.\n"); 468 exit(1); 469 } 470 } 471#endif 472 pid = fork(); 473 if (pid == -1) { 474 error("Can't fork; try again.\n"); 475 exit(1); 476 } 477 if (pid) { 478#ifdef CRYPT 479 if (doencrypt) { 480 static char msg[] = SECURE_MESSAGE; 481 (void) close(pv1[1]); 482 (void) close(pv2[1]); 483 des_enc_write(s, msg, sizeof(msg) - 1, 484 schedule, &kdata->session); 485 486 } else 487#endif 488 { 489 (void) close(0); 490 (void) close(1); 491 } 492 (void) close(2); 493 (void) close(pv[1]); 494 495 FD_ZERO(&readfrom); 496 FD_SET(s, &readfrom); 497 FD_SET(pv[0], &readfrom); 498 if (pv[0] > s) 499 nfd = pv[0]; 500 else 501 nfd = s; 502#ifdef CRYPT 503 if (doencrypt) { 504 FD_ZERO(&writeto); 505 FD_SET(pv2[0], &writeto); 506 FD_SET(pv1[0], &readfrom); 507 508 nfd = MAX(nfd, pv2[0]); 509 nfd = MAX(nfd, pv1[0]); 510 } else 511#endif 512 ioctl(pv[0], FIONBIO, (char *)&one); 513 514 /* should set s nbio! */ 515 nfd++; 516 do { 517 ready = readfrom; 518#ifdef CRYPT 519 if (doencrypt) { 520 wready = writeto; 521 if (select(nfd, &ready, 522 &wready, (fd_set *) 0, 523 (struct timeval *) 0) < 0) 524 break; 525 } else 526#endif 527 if (select(nfd, &ready, (fd_set *)0, 528 (fd_set *)0, (struct timeval *)0) < 0) 529 break; 530 if (FD_ISSET(s, &ready)) { 531 int ret; 532#ifdef CRYPT 533 if (doencrypt) 534 ret = des_enc_read(s, &sig, 1, 535 schedule, &kdata->session); 536 else 537#endif 538 ret = read(s, &sig, 1); 539 if (ret <= 0) 540 FD_CLR(s, &readfrom); 541 else 542 killpg(pid, sig); 543 } 544 if (FD_ISSET(pv[0], &ready)) { 545 errno = 0; 546 cc = read(pv[0], buf, sizeof(buf)); 547 if (cc <= 0) { 548 shutdown(s, 1+1); 549 FD_CLR(pv[0], &readfrom); 550 } else { 551#ifdef CRYPT 552 if (doencrypt) 553 (void) 554 des_enc_write(s, buf, cc, 555 schedule, &kdata->session); 556 else 557#endif 558 (void) 559 write(s, buf, cc); 560 } 561 } 562#ifdef CRYPT 563 if (doencrypt && FD_ISSET(pv1[0], &ready)) { 564 errno = 0; 565 cc = read(pv1[0], buf, sizeof(buf)); 566 if (cc <= 0) { 567 shutdown(pv1[0], 1+1); 568 FD_CLR(pv1[0], &readfrom); 569 } else 570 (void) des_enc_write(STDOUT_FILENO, 571 buf, cc, 572 schedule, &kdata->session); 573 } 574 575 if (doencrypt && FD_ISSET(pv2[0], &wready)) { 576 errno = 0; 577 cc = des_enc_read(STDIN_FILENO, 578 buf, sizeof(buf), 579 schedule, &kdata->session); 580 if (cc <= 0) { 581 shutdown(pv2[0], 1+1); 582 FD_CLR(pv2[0], &writeto); 583 } else 584 (void) write(pv2[0], buf, cc); 585 } 586#endif 587 588 } while (FD_ISSET(s, &readfrom) || 589#ifdef CRYPT 590 (doencrypt && FD_ISSET(pv1[0], &readfrom)) || 591#endif 592 FD_ISSET(pv[0], &readfrom)); 593 exit(0); 594 } 595 setpgrp(0, getpid()); 596 (void) close(s); 597 (void) close(pv[0]); 598#ifdef CRYPT 599 if (doencrypt) { 600 close(pv1[0]); close(pv2[0]); 601 dup2(pv1[1], 1); 602 dup2(pv2[1], 0); 603 close(pv1[1]); 604 close(pv2[1]); 605 } 606#endif 607 dup2(pv[1], 2); 608 close(pv[1]); 609 } 610 if (*pwd->pw_shell == '\0') 611 pwd->pw_shell = _PATH_BSHELL; 612 environ = envinit; 613 strncat(homedir, pwd->pw_dir, sizeof(homedir)-6); 614 strcat(path, _PATH_DEFPATH); 615 strncat(shell, pwd->pw_shell, sizeof(shell)-7); 616 strncat(username, pwd->pw_name, sizeof(username)-6); 617 cp = strrchr(pwd->pw_shell, '/'); 618 if (cp) 619 cp++; 620 else 621 cp = pwd->pw_shell; 622#ifdef LOGIN_CAP 623 if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETALL) != 0) { 624 syslog(LOG_ERR, "setusercontext: %m"); 625 exit(1); 626 } 627 login_close(lc); 628#else 629 (void) setgid((gid_t)pwd->pw_gid); 630 initgroups(pwd->pw_name, pwd->pw_gid); 631 (void) setuid((uid_t)pwd->pw_uid); 632#endif 633 endpwent(); 634 if (log_success || pwd->pw_uid == 0) { 635 syslog(LOG_INFO|LOG_AUTH, "%s@%s as %s: cmd='%.80s'", 636 remuser, fromhost, locuser, cmdbuf); 637 } 638 execl(pwd->pw_shell, cp, "-c", cmdbuf, 0); 639 perror(pwd->pw_shell); 640 exit(1); 641} 642 643/* 644 * Report error to client. Note: can't be used until second socket has 645 * connected to client, or older clients will hang waiting for that 646 * connection first. 647 */ 648#if __STDC__ 649#include <stdarg.h> 650#else 651#include <varargs.h> 652#endif 653 654void 655#if __STDC__ 656error(const char *fmt, ...) 657#else 658error(fmt, va_alist) 659 char *fmt; 660 va_dcl 661#endif 662{ 663 va_list ap; 664 int len; 665 char *bp, buf[BUFSIZ]; 666#if __STDC__ 667 va_start(ap, fmt); 668#else 669 va_start(ap); 670#endif 671 bp = buf; 672 if (sent_null == 0) { 673 *bp++ = 1; 674 len = 1; 675 } else 676 len = 0; 677 (void)vsnprintf(bp, sizeof(buf) - 1, fmt, ap); 678 (void)write(STDERR_FILENO, buf, len + strlen(bp)); 679} 680 681void 682getstr(buf, cnt, err) 683 char *buf, *err; 684 int cnt; 685{ 686 char c; 687 688 do { 689 if (read(STDIN_FILENO, &c, 1) != 1) 690 exit(1); 691 *buf++ = c; 692 if (--cnt == 0) { 693 error("%s too long\n", err); 694 exit(1); 695 } 696 } while (c != 0); 697} 698 699/* 700 * Check whether host h is in our local domain, 701 * defined as sharing the last two components of the domain part, 702 * or the entire domain part if the local domain has only one component. 703 * If either name is unqualified (contains no '.'), 704 * assume that the host is local, as it will be 705 * interpreted as such. 706 */ 707int 708local_domain(h) 709 char *h; 710{ 711 char localhost[MAXHOSTNAMELEN]; 712 char *p1, *p2; 713 714 localhost[0] = 0; 715 (void) gethostname(localhost, sizeof(localhost) - 1); 716 localhost[sizeof(localhost) - 1] = '\0'; 717 p1 = topdomain(localhost); 718 p2 = topdomain(h); 719 if (p1 == NULL || p2 == NULL || !strcasecmp(p1, p2)) 720 return (1); 721 return (0); 722} 723 724char * 725topdomain(h) 726 char *h; 727{ 728 char *p, *maybe = NULL; 729 int dots = 0; 730 731 for (p = h + strlen(h); p >= h; p--) { 732 if (*p == '.') { 733 if (++dots == 2) 734 return (p); 735 maybe = p; 736 } 737 } 738 return (maybe); 739} 740 741void 742usage() 743{ 744 745 syslog(LOG_ERR, "usage: rshd [-%s]", OPTIONS); 746 exit(2); 747} 748