1 /* 2 * Copyright (c) 1983, 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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)rcmd.c 8.3 (Berkeley) 3/26/94 30 * $FreeBSD: src/lib/libc/net/rcmd.c,v 1.42 2007/01/09 00:28:02 imp Exp $ 31 */ 32 33 #include "namespace.h" 34 #include <sys/param.h> 35 #include <sys/socket.h> 36 #include <sys/stat.h> 37 38 #include <netinet/in.h> 39 #include <arpa/inet.h> 40 41 #include <signal.h> 42 #include <fcntl.h> 43 #include <netdb.h> 44 #include <stdlib.h> 45 #include <unistd.h> 46 #include <pwd.h> 47 #include <errno.h> 48 #include <stdio.h> 49 #include <ctype.h> 50 #include <string.h> 51 #include <rpc/rpc.h> 52 #ifdef YP 53 #include <rpcsvc/yp_prot.h> 54 #include <rpcsvc/ypclnt.h> 55 #endif 56 #include <arpa/nameser.h> 57 #include "un-namespace.h" 58 59 extern int innetgr(const char *, const char *, const char *, const char *); 60 61 #define max(a, b) ((a > b) ? a : b) 62 63 int __ivaliduser(FILE *, u_int32_t, const char *, const char *); 64 int __ivaliduser_af(FILE *,const void *, const char *, const char *, int, int); 65 int __ivaliduser_sa(FILE *, const struct sockaddr *, socklen_t, const char *, 66 const char *); 67 static int __icheckhost(const struct sockaddr *, socklen_t, const char *); 68 69 char paddr[NI_MAXHOST]; 70 71 int 72 rcmd(char **ahost, int rport, const char *locuser, const char *remuser, 73 const char *cmd, int *fd2p) 74 { 75 return rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, AF_INET); 76 } 77 78 int 79 rcmd_af(char **ahost, int rport, const char *locuser, const char *remuser, 80 const char *cmd, int *fd2p, int af) 81 { 82 struct addrinfo hints, *res, *ai; 83 struct sockaddr_storage from; 84 fd_set reads; 85 sigset_t oldmask, newmask; 86 pid_t pid; 87 int s, aport, lport, timo, error; 88 char c, *p; 89 int refused, nres; 90 char num[8]; 91 static char canonnamebuf[MAXDNAME]; /* is it proper here? */ 92 93 /* call rcmdsh() with specified remote shell if appropriate. */ 94 if (!issetugid() && (p = getenv("RSH"))) { 95 struct servent *sp = getservbyname("shell", "tcp"); 96 97 if (sp && sp->s_port == rport) 98 return (rcmdsh(ahost, rport, locuser, remuser, 99 cmd, p)); 100 } 101 102 /* use rsh(1) if non-root and remote port is shell. */ 103 if (geteuid()) { 104 struct servent *sp = getservbyname("shell", "tcp"); 105 106 if (sp && sp->s_port == rport) 107 return (rcmdsh(ahost, rport, locuser, remuser, 108 cmd, NULL)); 109 } 110 111 pid = getpid(); 112 113 memset(&hints, 0, sizeof(hints)); 114 hints.ai_flags = AI_CANONNAME; 115 hints.ai_family = af; 116 hints.ai_socktype = SOCK_STREAM; 117 hints.ai_protocol = 0; 118 snprintf(num, sizeof(num), "%d", ntohs(rport)); 119 error = getaddrinfo(*ahost, num, &hints, &res); 120 if (error) { 121 fprintf(stderr, "rcmd: getaddrinfo: %s\n", 122 gai_strerror(error)); 123 if (error == EAI_SYSTEM) 124 fprintf(stderr, "rcmd: getaddrinfo: %s\n", 125 strerror(errno)); 126 return (-1); 127 } 128 129 if (res->ai_canonname && 130 strlen(res->ai_canonname) + 1 < sizeof(canonnamebuf)) { 131 strncpy(canonnamebuf, res->ai_canonname, sizeof(canonnamebuf)); 132 *ahost = canonnamebuf; 133 } 134 nres = 0; 135 for (ai = res; ai; ai = ai->ai_next) 136 nres++; 137 ai = res; 138 refused = 0; 139 sigemptyset(&newmask); 140 sigaddset(&newmask, SIGURG); 141 _sigprocmask(SIG_BLOCK, (const sigset_t *)&newmask, &oldmask); 142 for (timo = 1, lport = IPPORT_RESERVED - 1;;) { 143 s = rresvport_af(&lport, ai->ai_family); 144 if (s < 0) { 145 if (errno != EAGAIN && ai->ai_next) { 146 ai = ai->ai_next; 147 continue; 148 } 149 if (errno == EAGAIN) 150 fprintf(stderr, 151 "rcmd: socket: All ports in use\n"); 152 else 153 fprintf(stderr, "rcmd: socket: %s\n", 154 strerror(errno)); 155 freeaddrinfo(res); 156 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, 157 NULL); 158 return (-1); 159 } 160 _fcntl(s, F_SETOWN, pid); 161 if (_connect(s, ai->ai_addr, ai->ai_addrlen) >= 0) 162 break; 163 _close(s); 164 if (errno == EADDRINUSE) { 165 lport--; 166 continue; 167 } 168 if (errno == ECONNREFUSED) 169 refused = 1; 170 if (ai->ai_next == NULL && (!refused || timo > 16)) { 171 fprintf(stderr, "%s: %s\n", *ahost, strerror(errno)); 172 freeaddrinfo(res); 173 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, 174 NULL); 175 return (-1); 176 } 177 if (nres > 1) { 178 int oerrno = errno; 179 180 getnameinfo(ai->ai_addr, ai->ai_addrlen, paddr, 181 sizeof(paddr), NULL, 0, NI_NUMERICHOST); 182 fprintf(stderr, "connect to address %s: ", paddr); 183 errno = oerrno; 184 perror(0); 185 } 186 if ((ai = ai->ai_next) == NULL) { 187 /* refused && timo <= 16 */ 188 struct timespec time_to_sleep, time_remaining; 189 190 time_to_sleep.tv_sec = timo; 191 time_to_sleep.tv_nsec = 0; 192 _nanosleep(&time_to_sleep, &time_remaining); 193 timo *= 2; 194 ai = res; 195 refused = 0; 196 } 197 if (nres > 1) { 198 getnameinfo(ai->ai_addr, ai->ai_addrlen, paddr, 199 sizeof(paddr), NULL, 0, NI_NUMERICHOST); 200 fprintf(stderr, "Trying %s...\n", paddr); 201 } 202 } 203 lport--; 204 if (fd2p == NULL) { 205 _write(s, "", 1); 206 lport = 0; 207 } else { 208 int s2 = rresvport_af(&lport, ai->ai_family), s3; 209 socklen_t len = ai->ai_addrlen; 210 int nfds; 211 212 if (s2 < 0) 213 goto bad; 214 _listen(s2, 1); 215 snprintf(num, sizeof(num), "%d", lport); 216 if (_write(s, num, strlen(num)+1) != strlen(num)+1) { 217 fprintf(stderr, 218 "rcmd: write (setting up stderr): %s\n", 219 strerror(errno)); 220 _close(s2); 221 goto bad; 222 } 223 nfds = max(s, s2)+1; 224 if(nfds > FD_SETSIZE) { 225 fprintf(stderr, "rcmd: too many files\n"); 226 _close(s2); 227 goto bad; 228 } 229 again: 230 FD_ZERO(&reads); 231 FD_SET(s, &reads); 232 FD_SET(s2, &reads); 233 errno = 0; 234 if (_select(nfds, &reads, 0, 0, 0) < 1 || !FD_ISSET(s2, &reads)){ 235 if (errno != 0) 236 fprintf(stderr, 237 "rcmd: select (setting up stderr): %s\n", 238 strerror(errno)); 239 else 240 fprintf(stderr, 241 "select: protocol failure in circuit setup\n"); 242 _close(s2); 243 goto bad; 244 } 245 s3 = _accept(s2, (struct sockaddr *)&from, &len); 246 switch (from.ss_family) { 247 case AF_INET: 248 aport = ntohs(((struct sockaddr_in *)&from)->sin_port); 249 break; 250 #ifdef INET6 251 case AF_INET6: 252 aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port); 253 break; 254 #endif 255 default: 256 aport = 0; /* error */ 257 break; 258 } 259 /* 260 * XXX careful for ftp bounce attacks. If discovered, shut them 261 * down and check for the real auxiliary channel to connect. 262 */ 263 if (aport == 20) { 264 _close(s3); 265 goto again; 266 } 267 _close(s2); 268 if (s3 < 0) { 269 fprintf(stderr, 270 "rcmd: accept: %s\n", strerror(errno)); 271 lport = 0; 272 goto bad; 273 } 274 *fd2p = s3; 275 if (aport >= IPPORT_RESERVED || aport < IPPORT_RESERVED / 2) { 276 fprintf(stderr, 277 "socket: protocol failure in circuit setup.\n"); 278 goto bad2; 279 } 280 } 281 _write(s, locuser, strlen(locuser)+1); 282 _write(s, remuser, strlen(remuser)+1); 283 _write(s, cmd, strlen(cmd)+1); 284 if (_read(s, &c, 1) != 1) { 285 fprintf(stderr, 286 "rcmd: %s: %s\n", *ahost, strerror(errno)); 287 goto bad2; 288 } 289 if (c != 0) { 290 while (_read(s, &c, 1) == 1) { 291 _write(STDERR_FILENO, &c, 1); 292 if (c == '\n') 293 break; 294 } 295 goto bad2; 296 } 297 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL); 298 freeaddrinfo(res); 299 return (s); 300 bad2: 301 if (lport) 302 _close(*fd2p); 303 bad: 304 _close(s); 305 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL); 306 freeaddrinfo(res); 307 return (-1); 308 } 309 310 int 311 rresvport(int *port) 312 { 313 return rresvport_af(port, AF_INET); 314 } 315 316 int 317 rresvport_af(int *alport, int family) 318 { 319 int s; 320 struct sockaddr_storage ss; 321 u_short *sport; 322 323 memset(&ss, 0, sizeof(ss)); 324 ss.ss_family = family; 325 switch (family) { 326 case AF_INET: 327 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in); 328 sport = &((struct sockaddr_in *)&ss)->sin_port; 329 ((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY; 330 break; 331 #ifdef INET6 332 case AF_INET6: 333 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in6); 334 sport = &((struct sockaddr_in6 *)&ss)->sin6_port; 335 ((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any; 336 break; 337 #endif 338 default: 339 errno = EAFNOSUPPORT; 340 return -1; 341 } 342 343 s = _socket(ss.ss_family, SOCK_STREAM, 0); 344 if (s < 0) 345 return (-1); 346 #if 0 /* compat_exact_traditional_rresvport_semantics */ 347 sin.sin_port = htons((u_short)*alport); 348 if (_bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0) 349 return (s); 350 if (errno != EADDRINUSE) { 351 _close(s); 352 return (-1); 353 } 354 #endif 355 *sport = 0; 356 if (bindresvport_sa(s, (struct sockaddr *)&ss) == -1) { 357 _close(s); 358 return (-1); 359 } 360 *alport = (int)ntohs(*sport); 361 return (s); 362 } 363 364 int __check_rhosts_file = 1; 365 char *__rcmd_errstr; 366 367 int 368 ruserok(const char *rhost, int superuser, const char *ruser, const char *luser) 369 { 370 struct addrinfo hints, *res, *r; 371 int error; 372 373 memset(&hints, 0, sizeof(hints)); 374 hints.ai_family = PF_UNSPEC; 375 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 376 error = getaddrinfo(rhost, "0", &hints, &res); 377 if (error) 378 return (-1); 379 380 for (r = res; r; r = r->ai_next) { 381 if (iruserok_sa(r->ai_addr, r->ai_addrlen, superuser, ruser, 382 luser) == 0) { 383 freeaddrinfo(res); 384 return (0); 385 } 386 } 387 freeaddrinfo(res); 388 return (-1); 389 } 390 391 /* 392 * New .rhosts strategy: We are passed an ip address. We spin through 393 * hosts.equiv and .rhosts looking for a match. When the .rhosts only 394 * has ip addresses, we don't have to trust a nameserver. When it 395 * contains hostnames, we spin through the list of addresses the nameserver 396 * gives us and look for a match. 397 * 398 * Returns 0 if ok, -1 if not ok. 399 */ 400 int 401 iruserok(unsigned long raddr, int superuser, const char *ruser, 402 const char *luser) 403 { 404 struct sockaddr_in sin; 405 406 memset(&sin, 0, sizeof(sin)); 407 sin.sin_family = AF_INET; 408 sin.sin_len = sizeof(struct sockaddr_in); 409 memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr)); 410 return iruserok_sa((struct sockaddr *)&sin, sin.sin_len, superuser, 411 ruser, luser); 412 } 413 414 /* 415 * AF independent extension of iruserok. 416 * 417 * Returns 0 if ok, -1 if not ok. 418 */ 419 int 420 iruserok_sa(const void *ra, int rlen, int superuser, const char *ruser, 421 const char *luser) 422 { 423 char *cp; 424 struct stat sbuf; 425 struct passwd *pwd; 426 FILE *hostf; 427 uid_t uid; 428 int first; 429 char pbuf[MAXPATHLEN]; 430 const struct sockaddr *raddr; 431 struct sockaddr_storage ss; 432 433 /* avoid alignment issue */ 434 if (rlen > sizeof(ss)) 435 return(-1); 436 memcpy(&ss, ra, rlen); 437 raddr = (struct sockaddr *)&ss; 438 439 first = 1; 440 hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r"); 441 again: 442 if (hostf) { 443 if (__ivaliduser_sa(hostf, raddr, rlen, luser, ruser) == 0) { 444 fclose(hostf); 445 return (0); 446 } 447 fclose(hostf); 448 } 449 if (first == 1 && (__check_rhosts_file || superuser)) { 450 first = 0; 451 if ((pwd = getpwnam(luser)) == NULL) 452 return (-1); 453 strcpy(pbuf, pwd->pw_dir); 454 strcat(pbuf, "/.rhosts"); 455 456 /* 457 * Change effective uid while opening .rhosts. If root and 458 * reading an NFS mounted file system, can't read files that 459 * are protected read/write owner only. 460 */ 461 uid = geteuid(); 462 seteuid(pwd->pw_uid); 463 hostf = fopen(pbuf, "r"); 464 seteuid(uid); 465 466 if (hostf == NULL) 467 return (-1); 468 /* 469 * If not a regular file, or is owned by someone other than 470 * user or root or if writeable by anyone but the owner, quit. 471 */ 472 cp = NULL; 473 if (lstat(pbuf, &sbuf) < 0) 474 cp = ".rhosts lstat failed"; 475 else if (!S_ISREG(sbuf.st_mode)) 476 cp = ".rhosts not regular file"; 477 else if (_fstat(fileno(hostf), &sbuf) < 0) 478 cp = ".rhosts fstat failed"; 479 else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid) 480 cp = "bad .rhosts owner"; 481 else if (sbuf.st_mode & (S_IWGRP|S_IWOTH)) 482 cp = ".rhosts writeable by other than owner"; 483 /* If there were any problems, quit. */ 484 if (cp) { 485 __rcmd_errstr = cp; 486 fclose(hostf); 487 return (-1); 488 } 489 goto again; 490 } 491 return (-1); 492 } 493 494 /* 495 * XXX 496 * Don't make static, used by lpd(8). 497 * 498 * Returns 0 if ok, -1 if not ok. 499 */ 500 int 501 __ivaliduser(FILE *hostf, u_int32_t raddr, const char *luser, const char *ruser) 502 { 503 struct sockaddr_in sin; 504 505 memset(&sin, 0, sizeof(sin)); 506 sin.sin_family = AF_INET; 507 sin.sin_len = sizeof(struct sockaddr_in); 508 memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr)); 509 return __ivaliduser_sa(hostf, (struct sockaddr *)&sin, sin.sin_len, 510 luser, ruser); 511 } 512 513 /* 514 * Returns 0 if ok, -1 if not ok. 515 * 516 * XXX obsolete API. 517 */ 518 int 519 __ivaliduser_af(FILE *hostf, const void *raddr, const char *luser, 520 const char *ruser, int af, int len) 521 { 522 struct sockaddr *sa = NULL; 523 struct sockaddr_in *sin = NULL; 524 #ifdef INET6 525 struct sockaddr_in6 *sin6 = NULL; 526 #endif 527 struct sockaddr_storage ss; 528 529 memset(&ss, 0, sizeof(ss)); 530 switch (af) { 531 case AF_INET: 532 if (len != sizeof(sin->sin_addr)) 533 return -1; 534 sin = (struct sockaddr_in *)&ss; 535 sin->sin_family = AF_INET; 536 sin->sin_len = sizeof(struct sockaddr_in); 537 memcpy(&sin->sin_addr, raddr, sizeof(sin->sin_addr)); 538 break; 539 #ifdef INET6 540 case AF_INET6: 541 if (len != sizeof(sin6->sin6_addr)) 542 return -1; 543 /* you will lose scope info */ 544 sin6 = (struct sockaddr_in6 *)&ss; 545 sin6->sin6_family = AF_INET6; 546 sin6->sin6_len = sizeof(struct sockaddr_in6); 547 memcpy(&sin6->sin6_addr, raddr, sizeof(sin6->sin6_addr)); 548 break; 549 #endif 550 default: 551 return -1; 552 } 553 554 sa = (struct sockaddr *)&ss; 555 return __ivaliduser_sa(hostf, sa, sa->sa_len, luser, ruser); 556 } 557 558 int 559 __ivaliduser_sa(FILE *hostf, const struct sockaddr *raddr, socklen_t salen, 560 const char *luser, const char *ruser) 561 { 562 char *user, *p; 563 int ch; 564 char buf[MAXHOSTNAMELEN + 128]; /* host + login */ 565 char hname[MAXHOSTNAMELEN]; 566 /* Presumed guilty until proven innocent. */ 567 int userok = 0, hostok = 0; 568 #ifdef YP 569 char *ypdomain; 570 571 if (yp_get_default_domain(&ypdomain)) 572 ypdomain = NULL; 573 #else 574 #define ypdomain NULL 575 #endif 576 /* We need to get the damn hostname back for netgroup matching. */ 577 if (getnameinfo(raddr, salen, hname, sizeof(hname), NULL, 0, 578 NI_NAMEREQD) != 0) 579 hname[0] = '\0'; 580 581 while (fgets(buf, sizeof(buf), hostf)) { 582 p = buf; 583 /* Skip lines that are too long. */ 584 if (strchr(p, '\n') == NULL) { 585 while ((ch = getc(hostf)) != '\n' && ch != EOF); 586 continue; 587 } 588 if (*p == '\n' || *p == '#') { 589 /* comment... */ 590 continue; 591 } 592 while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') { 593 *p = isupper((unsigned char)*p) ? tolower((unsigned char)*p) : *p; 594 p++; 595 } 596 if (*p == ' ' || *p == '\t') { 597 *p++ = '\0'; 598 while (*p == ' ' || *p == '\t') 599 p++; 600 user = p; 601 while (*p != '\n' && *p != ' ' && 602 *p != '\t' && *p != '\0') 603 p++; 604 } else 605 user = p; 606 *p = '\0'; 607 /* 608 * Do +/- and +@/-@ checking. This looks really nasty, 609 * but it matches SunOS's behavior so far as I can tell. 610 */ 611 switch(buf[0]) { 612 case '+': 613 if (!buf[1]) { /* '+' matches all hosts */ 614 hostok = 1; 615 break; 616 } 617 if (buf[1] == '@') /* match a host by netgroup */ 618 hostok = hname[0] != '\0' && 619 innetgr(&buf[2], hname, NULL, ypdomain); 620 else /* match a host by addr */ 621 hostok = __icheckhost(raddr, salen, 622 (char *)&buf[1]); 623 break; 624 case '-': /* reject '-' hosts and all their users */ 625 if (buf[1] == '@') { 626 if (hname[0] == '\0' || 627 innetgr(&buf[2], hname, NULL, ypdomain)) 628 return(-1); 629 } else { 630 if (__icheckhost(raddr, salen, 631 (char *)&buf[1])) 632 return(-1); 633 } 634 break; 635 default: /* if no '+' or '-', do a simple match */ 636 hostok = __icheckhost(raddr, salen, buf); 637 break; 638 } 639 switch(*user) { 640 case '+': 641 if (!*(user+1)) { /* '+' matches all users */ 642 userok = 1; 643 break; 644 } 645 if (*(user+1) == '@') /* match a user by netgroup */ 646 userok = innetgr(user+2, NULL, ruser, ypdomain); 647 else /* match a user by direct specification */ 648 userok = !(strcmp(ruser, user+1)); 649 break; 650 case '-': /* if we matched a hostname, */ 651 if (hostok) { /* check for user field rejections */ 652 if (!*(user+1)) 653 return(-1); 654 if (*(user+1) == '@') { 655 if (innetgr(user+2, NULL, 656 ruser, ypdomain)) 657 return(-1); 658 } else { 659 if (!strcmp(ruser, user+1)) 660 return(-1); 661 } 662 } 663 break; 664 default: /* no rejections: try to match the user */ 665 if (hostok) 666 userok = !(strcmp(ruser,*user ? user : luser)); 667 break; 668 } 669 if (hostok && userok) 670 return(0); 671 } 672 return (-1); 673 } 674 675 /* 676 * Returns "true" if match, 0 if no match. 677 */ 678 static int 679 __icheckhost(const struct sockaddr *raddr, socklen_t salen, const char *lhost) 680 { 681 struct sockaddr_in sin; 682 struct sockaddr_in6 *sin6; 683 struct addrinfo hints, *res, *r; 684 int error; 685 char h1[NI_MAXHOST], h2[NI_MAXHOST]; 686 687 if (raddr->sa_family == AF_INET6) { 688 sin6 = (struct sockaddr_in6 *)raddr; 689 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 690 memset(&sin, 0, sizeof(sin)); 691 sin.sin_family = AF_INET; 692 sin.sin_len = sizeof(struct sockaddr_in); 693 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], 694 sizeof(sin.sin_addr)); 695 raddr = (struct sockaddr *)&sin; 696 salen = sin.sin_len; 697 } 698 } 699 700 h1[0] = '\0'; 701 if (getnameinfo(raddr, salen, h1, sizeof(h1), NULL, 0, 702 NI_NUMERICHOST) != 0) 703 return (0); 704 705 /* Resolve laddr into sockaddr */ 706 memset(&hints, 0, sizeof(hints)); 707 hints.ai_family = raddr->sa_family; 708 hints.ai_socktype = SOCK_DGRAM; /*XXX dummy*/ 709 res = NULL; 710 error = getaddrinfo(lhost, "0", &hints, &res); 711 if (error) 712 return (0); 713 714 for (r = res; r ; r = r->ai_next) { 715 h2[0] = '\0'; 716 if (getnameinfo(r->ai_addr, r->ai_addrlen, h2, sizeof(h2), 717 NULL, 0, NI_NUMERICHOST) != 0) 718 continue; 719 if (strcmp(h1, h2) == 0) { 720 freeaddrinfo(res); 721 return (1); 722 } 723 } 724 725 /* No match. */ 726 freeaddrinfo(res); 727 return (0); 728 } 729