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 * $DragonFly: src/lib/libc/net/rcmd.c,v 1.7 2005/11/13 02:04:47 swildner Exp $ 32 */ 33 34 #include "namespace.h" 35 #include <sys/param.h> 36 #include <sys/socket.h> 37 #include <sys/stat.h> 38 39 #include <netinet/in.h> 40 #include <arpa/inet.h> 41 42 #include <signal.h> 43 #include <fcntl.h> 44 #include <netdb.h> 45 #include <stdlib.h> 46 #include <unistd.h> 47 #include <pwd.h> 48 #include <errno.h> 49 #include <stdio.h> 50 #include <ctype.h> 51 #include <string.h> 52 #include <rpc/rpc.h> 53 #ifdef YP 54 #include <rpcsvc/yp_prot.h> 55 #include <rpcsvc/ypclnt.h> 56 #endif 57 #include <arpa/nameser.h> 58 #include "un-namespace.h" 59 60 extern int innetgr(const char *, const char *, const char *, const char *); 61 62 #define max(a, b) ((a > b) ? a : b) 63 64 int __ivaliduser(FILE *, u_int32_t, const char *, const char *); 65 int __ivaliduser_af(FILE *,const void *, const char *, const char *, int, int); 66 int __ivaliduser_sa(FILE *, const struct sockaddr *, socklen_t, const char *, 67 const char *); 68 static int __icheckhost(const struct sockaddr *, socklen_t, const char *); 69 70 char paddr[NI_MAXHOST]; 71 72 int 73 rcmd(char **ahost, int rport, const char *locuser, const char *remuser, 74 const char *cmd, int *fd2p) 75 { 76 return rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, AF_INET); 77 } 78 79 int 80 rcmd_af(char **ahost, int rport, const char *locuser, const char *remuser, 81 const char *cmd, int *fd2p, int af) 82 { 83 struct addrinfo hints, *res, *ai; 84 struct sockaddr_storage from; 85 fd_set reads; 86 sigset_t oldmask, newmask; 87 pid_t pid; 88 int s, aport, lport, timo, error; 89 char c, *p; 90 int refused, nres; 91 char num[8]; 92 static char canonnamebuf[MAXDNAME]; /* is it proper here? */ 93 94 /* call rcmdsh() with specified remote shell if appropriate. */ 95 if (!issetugid() && (p = getenv("RSH"))) { 96 struct servent *sp = getservbyname("shell", "tcp"); 97 98 if (sp && sp->s_port == rport) 99 return (rcmdsh(ahost, rport, locuser, remuser, 100 cmd, p)); 101 } 102 103 /* use rsh(1) if non-root and remote port is shell. */ 104 if (geteuid()) { 105 struct servent *sp = getservbyname("shell", "tcp"); 106 107 if (sp && sp->s_port == rport) 108 return (rcmdsh(ahost, rport, locuser, remuser, 109 cmd, NULL)); 110 } 111 112 pid = getpid(); 113 114 memset(&hints, 0, sizeof(hints)); 115 hints.ai_flags = AI_CANONNAME; 116 hints.ai_family = af; 117 hints.ai_socktype = SOCK_STREAM; 118 hints.ai_protocol = 0; 119 snprintf(num, sizeof(num), "%d", ntohs(rport)); 120 error = getaddrinfo(*ahost, num, &hints, &res); 121 if (error) { 122 fprintf(stderr, "rcmd: getaddrinfo: %s\n", 123 gai_strerror(error)); 124 if (error == EAI_SYSTEM) 125 fprintf(stderr, "rcmd: getaddrinfo: %s\n", 126 strerror(errno)); 127 return (-1); 128 } 129 130 if (res->ai_canonname && 131 strlen(res->ai_canonname) + 1 < sizeof(canonnamebuf)) { 132 strncpy(canonnamebuf, res->ai_canonname, sizeof(canonnamebuf)); 133 *ahost = canonnamebuf; 134 } 135 nres = 0; 136 for (ai = res; ai; ai = ai->ai_next) 137 nres++; 138 ai = res; 139 refused = 0; 140 sigemptyset(&newmask); 141 sigaddset(&newmask, SIGURG); 142 _sigprocmask(SIG_BLOCK, (const sigset_t *)&newmask, &oldmask); 143 for (timo = 1, lport = IPPORT_RESERVED - 1;;) { 144 s = rresvport_af(&lport, ai->ai_family); 145 if (s < 0) { 146 if (errno != EAGAIN && ai->ai_next) { 147 ai = ai->ai_next; 148 continue; 149 } 150 if (errno == EAGAIN) 151 fprintf(stderr, 152 "rcmd: socket: All ports in use\n"); 153 else 154 fprintf(stderr, "rcmd: socket: %s\n", 155 strerror(errno)); 156 freeaddrinfo(res); 157 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, 158 NULL); 159 return (-1); 160 } 161 _fcntl(s, F_SETOWN, pid); 162 if (_connect(s, ai->ai_addr, ai->ai_addrlen) >= 0) 163 break; 164 _close(s); 165 if (errno == EADDRINUSE) { 166 lport--; 167 continue; 168 } 169 if (errno == ECONNREFUSED) 170 refused = 1; 171 if (ai->ai_next == NULL && (!refused || timo > 16)) { 172 fprintf(stderr, "%s: %s\n", *ahost, strerror(errno)); 173 freeaddrinfo(res); 174 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, 175 NULL); 176 return (-1); 177 } 178 if (nres > 1) { 179 int oerrno = errno; 180 181 getnameinfo(ai->ai_addr, ai->ai_addrlen, paddr, 182 sizeof(paddr), NULL, 0, NI_NUMERICHOST); 183 fprintf(stderr, "connect to address %s: ", paddr); 184 errno = oerrno; 185 perror(0); 186 } 187 if ((ai = ai->ai_next) == NULL) { 188 /* refused && timo <= 16 */ 189 struct timespec time_to_sleep, time_remaining; 190 191 time_to_sleep.tv_sec = timo; 192 time_to_sleep.tv_nsec = 0; 193 _nanosleep(&time_to_sleep, &time_remaining); 194 timo *= 2; 195 ai = res; 196 refused = 0; 197 } 198 if (nres > 1) { 199 getnameinfo(ai->ai_addr, ai->ai_addrlen, paddr, 200 sizeof(paddr), NULL, 0, NI_NUMERICHOST); 201 fprintf(stderr, "Trying %s...\n", paddr); 202 } 203 } 204 lport--; 205 if (fd2p == 0) { 206 _write(s, "", 1); 207 lport = 0; 208 } else { 209 int s2 = rresvport_af(&lport, ai->ai_family), s3; 210 socklen_t len = ai->ai_addrlen; 211 int nfds; 212 213 if (s2 < 0) 214 goto bad; 215 _listen(s2, 1); 216 snprintf(num, sizeof(num), "%d", lport); 217 if (_write(s, num, strlen(num)+1) != strlen(num)+1) { 218 fprintf(stderr, 219 "rcmd: write (setting up stderr): %s\n", 220 strerror(errno)); 221 _close(s2); 222 goto bad; 223 } 224 nfds = max(s, s2)+1; 225 if(nfds > FD_SETSIZE) { 226 fprintf(stderr, "rcmd: too many files\n"); 227 _close(s2); 228 goto bad; 229 } 230 again: 231 FD_ZERO(&reads); 232 FD_SET(s, &reads); 233 FD_SET(s2, &reads); 234 errno = 0; 235 if (_select(nfds, &reads, 0, 0, 0) < 1 || !FD_ISSET(s2, &reads)){ 236 if (errno != 0) 237 fprintf(stderr, 238 "rcmd: select (setting up stderr): %s\n", 239 strerror(errno)); 240 else 241 fprintf(stderr, 242 "select: protocol failure in circuit setup\n"); 243 _close(s2); 244 goto bad; 245 } 246 s3 = _accept(s2, (struct sockaddr *)&from, &len); 247 switch (from.ss_family) { 248 case AF_INET: 249 aport = ntohs(((struct sockaddr_in *)&from)->sin_port); 250 break; 251 #ifdef INET6 252 case AF_INET6: 253 aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port); 254 break; 255 #endif 256 default: 257 aport = 0; /* error */ 258 break; 259 } 260 /* 261 * XXX careful for ftp bounce attacks. If discovered, shut them 262 * down and check for the real auxiliary channel to connect. 263 */ 264 if (aport == 20) { 265 _close(s3); 266 goto again; 267 } 268 _close(s2); 269 if (s3 < 0) { 270 fprintf(stderr, 271 "rcmd: accept: %s\n", strerror(errno)); 272 lport = 0; 273 goto bad; 274 } 275 *fd2p = s3; 276 if (aport >= IPPORT_RESERVED || aport < IPPORT_RESERVED / 2) { 277 fprintf(stderr, 278 "socket: protocol failure in circuit setup.\n"); 279 goto bad2; 280 } 281 } 282 _write(s, locuser, strlen(locuser)+1); 283 _write(s, remuser, strlen(remuser)+1); 284 _write(s, cmd, strlen(cmd)+1); 285 if (_read(s, &c, 1) != 1) { 286 fprintf(stderr, 287 "rcmd: %s: %s\n", *ahost, strerror(errno)); 288 goto bad2; 289 } 290 if (c != 0) { 291 while (_read(s, &c, 1) == 1) { 292 _write(STDERR_FILENO, &c, 1); 293 if (c == '\n') 294 break; 295 } 296 goto bad2; 297 } 298 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL); 299 freeaddrinfo(res); 300 return (s); 301 bad2: 302 if (lport) 303 _close(*fd2p); 304 bad: 305 _close(s); 306 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL); 307 freeaddrinfo(res); 308 return (-1); 309 } 310 311 int 312 rresvport(int *port) 313 { 314 return rresvport_af(port, AF_INET); 315 } 316 317 int 318 rresvport_af(int *alport, int family) 319 { 320 int s; 321 struct sockaddr_storage ss; 322 u_short *sport; 323 324 memset(&ss, 0, sizeof(ss)); 325 ss.ss_family = family; 326 switch (family) { 327 case AF_INET: 328 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in); 329 sport = &((struct sockaddr_in *)&ss)->sin_port; 330 ((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY; 331 break; 332 #ifdef INET6 333 case AF_INET6: 334 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in6); 335 sport = &((struct sockaddr_in6 *)&ss)->sin6_port; 336 ((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any; 337 break; 338 #endif 339 default: 340 errno = EAFNOSUPPORT; 341 return -1; 342 } 343 344 s = _socket(ss.ss_family, SOCK_STREAM, 0); 345 if (s < 0) 346 return (-1); 347 #if 0 /* compat_exact_traditional_rresvport_semantics */ 348 sin.sin_port = htons((u_short)*alport); 349 if (_bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0) 350 return (s); 351 if (errno != EADDRINUSE) { 352 _close(s); 353 return (-1); 354 } 355 #endif 356 *sport = 0; 357 if (bindresvport_sa(s, (struct sockaddr *)&ss) == -1) { 358 _close(s); 359 return (-1); 360 } 361 *alport = (int)ntohs(*sport); 362 return (s); 363 } 364 365 int __check_rhosts_file = 1; 366 char *__rcmd_errstr; 367 368 int 369 ruserok(const char *rhost, int superuser, const char *ruser, const char *luser) 370 { 371 struct addrinfo hints, *res, *r; 372 int error; 373 374 memset(&hints, 0, sizeof(hints)); 375 hints.ai_family = PF_UNSPEC; 376 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 377 error = getaddrinfo(rhost, "0", &hints, &res); 378 if (error) 379 return (-1); 380 381 for (r = res; r; r = r->ai_next) { 382 if (iruserok_sa(r->ai_addr, r->ai_addrlen, superuser, ruser, 383 luser) == 0) { 384 freeaddrinfo(res); 385 return (0); 386 } 387 } 388 freeaddrinfo(res); 389 return (-1); 390 } 391 392 /* 393 * New .rhosts strategy: We are passed an ip address. We spin through 394 * hosts.equiv and .rhosts looking for a match. When the .rhosts only 395 * has ip addresses, we don't have to trust a nameserver. When it 396 * contains hostnames, we spin through the list of addresses the nameserver 397 * gives us and look for a match. 398 * 399 * Returns 0 if ok, -1 if not ok. 400 */ 401 int 402 iruserok(unsigned long raddr, int superuser, const char *ruser, 403 const char *luser) 404 { 405 struct sockaddr_in sin; 406 407 memset(&sin, 0, sizeof(sin)); 408 sin.sin_family = AF_INET; 409 sin.sin_len = sizeof(struct sockaddr_in); 410 memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr)); 411 return iruserok_sa((struct sockaddr *)&sin, sin.sin_len, superuser, 412 ruser, luser); 413 } 414 415 /* 416 * AF independent extension of iruserok. 417 * 418 * Returns 0 if ok, -1 if not ok. 419 */ 420 int 421 iruserok_sa(const void *ra, int rlen, int superuser, const char *ruser, 422 const char *luser) 423 { 424 char *cp; 425 struct stat sbuf; 426 struct passwd *pwd; 427 FILE *hostf; 428 uid_t uid; 429 int first; 430 char pbuf[MAXPATHLEN]; 431 const struct sockaddr *raddr; 432 struct sockaddr_storage ss; 433 434 /* avoid alignment issue */ 435 if (rlen > sizeof(ss)) 436 return(-1); 437 memcpy(&ss, ra, rlen); 438 raddr = (struct sockaddr *)&ss; 439 440 first = 1; 441 hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r"); 442 again: 443 if (hostf) { 444 if (__ivaliduser_sa(hostf, raddr, rlen, luser, ruser) == 0) { 445 fclose(hostf); 446 return (0); 447 } 448 fclose(hostf); 449 } 450 if (first == 1 && (__check_rhosts_file || superuser)) { 451 first = 0; 452 if ((pwd = getpwnam(luser)) == NULL) 453 return (-1); 454 strcpy(pbuf, pwd->pw_dir); 455 strcat(pbuf, "/.rhosts"); 456 457 /* 458 * Change effective uid while opening .rhosts. If root and 459 * reading an NFS mounted file system, can't read files that 460 * are protected read/write owner only. 461 */ 462 uid = geteuid(); 463 seteuid(pwd->pw_uid); 464 hostf = fopen(pbuf, "r"); 465 seteuid(uid); 466 467 if (hostf == NULL) 468 return (-1); 469 /* 470 * If not a regular file, or is owned by someone other than 471 * user or root or if writeable by anyone but the owner, quit. 472 */ 473 cp = NULL; 474 if (lstat(pbuf, &sbuf) < 0) 475 cp = ".rhosts lstat failed"; 476 else if (!S_ISREG(sbuf.st_mode)) 477 cp = ".rhosts not regular file"; 478 else if (_fstat(fileno(hostf), &sbuf) < 0) 479 cp = ".rhosts fstat failed"; 480 else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid) 481 cp = "bad .rhosts owner"; 482 else if (sbuf.st_mode & (S_IWGRP|S_IWOTH)) 483 cp = ".rhosts writeable by other than owner"; 484 /* If there were any problems, quit. */ 485 if (cp) { 486 __rcmd_errstr = cp; 487 fclose(hostf); 488 return (-1); 489 } 490 goto again; 491 } 492 return (-1); 493 } 494 495 /* 496 * XXX 497 * Don't make static, used by lpd(8). 498 * 499 * Returns 0 if ok, -1 if not ok. 500 */ 501 int 502 __ivaliduser(FILE *hostf, u_int32_t raddr, const char *luser, const char *ruser) 503 { 504 struct sockaddr_in sin; 505 506 memset(&sin, 0, sizeof(sin)); 507 sin.sin_family = AF_INET; 508 sin.sin_len = sizeof(struct sockaddr_in); 509 memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr)); 510 return __ivaliduser_sa(hostf, (struct sockaddr *)&sin, sin.sin_len, 511 luser, ruser); 512 } 513 514 /* 515 * Returns 0 if ok, -1 if not ok. 516 * 517 * XXX obsolete API. 518 */ 519 int 520 __ivaliduser_af(FILE *hostf, const void *raddr, const char *luser, 521 const char *ruser, int af, int len) 522 { 523 struct sockaddr *sa = NULL; 524 struct sockaddr_in *sin = NULL; 525 #ifdef INET6 526 struct sockaddr_in6 *sin6 = NULL; 527 #endif 528 struct sockaddr_storage ss; 529 530 memset(&ss, 0, sizeof(ss)); 531 switch (af) { 532 case AF_INET: 533 if (len != sizeof(sin->sin_addr)) 534 return -1; 535 sin = (struct sockaddr_in *)&ss; 536 sin->sin_family = AF_INET; 537 sin->sin_len = sizeof(struct sockaddr_in); 538 memcpy(&sin->sin_addr, raddr, sizeof(sin->sin_addr)); 539 break; 540 #ifdef INET6 541 case AF_INET6: 542 if (len != sizeof(sin6->sin6_addr)) 543 return -1; 544 /* you will lose scope info */ 545 sin6 = (struct sockaddr_in6 *)&ss; 546 sin6->sin6_family = AF_INET6; 547 sin6->sin6_len = sizeof(struct sockaddr_in6); 548 memcpy(&sin6->sin6_addr, raddr, sizeof(sin6->sin6_addr)); 549 break; 550 #endif 551 default: 552 return -1; 553 } 554 555 sa = (struct sockaddr *)&ss; 556 return __ivaliduser_sa(hostf, sa, sa->sa_len, luser, ruser); 557 } 558 559 int 560 __ivaliduser_sa(FILE *hostf, const struct sockaddr *raddr, socklen_t salen, 561 const char *luser, const char *ruser) 562 { 563 char *user, *p; 564 int ch; 565 char buf[MAXHOSTNAMELEN + 128]; /* host + login */ 566 char hname[MAXHOSTNAMELEN]; 567 /* Presumed guilty until proven innocent. */ 568 int userok = 0, hostok = 0; 569 #ifdef YP 570 char *ypdomain; 571 572 if (yp_get_default_domain(&ypdomain)) 573 ypdomain = NULL; 574 #else 575 #define ypdomain NULL 576 #endif 577 /* We need to get the damn hostname back for netgroup matching. */ 578 if (getnameinfo(raddr, salen, hname, sizeof(hname), NULL, 0, 579 NI_NAMEREQD) != 0) 580 hname[0] = '\0'; 581 582 while (fgets(buf, sizeof(buf), hostf)) { 583 p = buf; 584 /* Skip lines that are too long. */ 585 if (strchr(p, '\n') == NULL) { 586 while ((ch = getc(hostf)) != '\n' && ch != EOF); 587 continue; 588 } 589 if (*p == '\n' || *p == '#') { 590 /* comment... */ 591 continue; 592 } 593 while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') { 594 *p = isupper((unsigned char)*p) ? tolower((unsigned char)*p) : *p; 595 p++; 596 } 597 if (*p == ' ' || *p == '\t') { 598 *p++ = '\0'; 599 while (*p == ' ' || *p == '\t') 600 p++; 601 user = p; 602 while (*p != '\n' && *p != ' ' && 603 *p != '\t' && *p != '\0') 604 p++; 605 } else 606 user = p; 607 *p = '\0'; 608 /* 609 * Do +/- and +@/-@ checking. This looks really nasty, 610 * but it matches SunOS's behavior so far as I can tell. 611 */ 612 switch(buf[0]) { 613 case '+': 614 if (!buf[1]) { /* '+' matches all hosts */ 615 hostok = 1; 616 break; 617 } 618 if (buf[1] == '@') /* match a host by netgroup */ 619 hostok = hname[0] != '\0' && 620 innetgr(&buf[2], hname, NULL, ypdomain); 621 else /* match a host by addr */ 622 hostok = __icheckhost(raddr, salen, 623 (char *)&buf[1]); 624 break; 625 case '-': /* reject '-' hosts and all their users */ 626 if (buf[1] == '@') { 627 if (hname[0] == '\0' || 628 innetgr(&buf[2], hname, NULL, ypdomain)) 629 return(-1); 630 } else { 631 if (__icheckhost(raddr, salen, 632 (char *)&buf[1])) 633 return(-1); 634 } 635 break; 636 default: /* if no '+' or '-', do a simple match */ 637 hostok = __icheckhost(raddr, salen, buf); 638 break; 639 } 640 switch(*user) { 641 case '+': 642 if (!*(user+1)) { /* '+' matches all users */ 643 userok = 1; 644 break; 645 } 646 if (*(user+1) == '@') /* match a user by netgroup */ 647 userok = innetgr(user+2, NULL, ruser, ypdomain); 648 else /* match a user by direct specification */ 649 userok = !(strcmp(ruser, user+1)); 650 break; 651 case '-': /* if we matched a hostname, */ 652 if (hostok) { /* check for user field rejections */ 653 if (!*(user+1)) 654 return(-1); 655 if (*(user+1) == '@') { 656 if (innetgr(user+2, NULL, 657 ruser, ypdomain)) 658 return(-1); 659 } else { 660 if (!strcmp(ruser, user+1)) 661 return(-1); 662 } 663 } 664 break; 665 default: /* no rejections: try to match the user */ 666 if (hostok) 667 userok = !(strcmp(ruser,*user ? user : luser)); 668 break; 669 } 670 if (hostok && userok) 671 return(0); 672 } 673 return (-1); 674 } 675 676 /* 677 * Returns "true" if match, 0 if no match. 678 */ 679 static int 680 __icheckhost(const struct sockaddr *raddr, socklen_t salen, const char *lhost) 681 { 682 struct sockaddr_in sin; 683 struct sockaddr_in6 *sin6; 684 struct addrinfo hints, *res, *r; 685 int error; 686 char h1[NI_MAXHOST], h2[NI_MAXHOST]; 687 688 if (raddr->sa_family == AF_INET6) { 689 sin6 = (struct sockaddr_in6 *)raddr; 690 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 691 memset(&sin, 0, sizeof(sin)); 692 sin.sin_family = AF_INET; 693 sin.sin_len = sizeof(struct sockaddr_in); 694 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], 695 sizeof(sin.sin_addr)); 696 raddr = (struct sockaddr *)&sin; 697 salen = sin.sin_len; 698 } 699 } 700 701 h1[0] = '\0'; 702 if (getnameinfo(raddr, salen, h1, sizeof(h1), NULL, 0, 703 NI_NUMERICHOST) != 0) 704 return (0); 705 706 /* Resolve laddr into sockaddr */ 707 memset(&hints, 0, sizeof(hints)); 708 hints.ai_family = raddr->sa_family; 709 hints.ai_socktype = SOCK_DGRAM; /*XXX dummy*/ 710 res = NULL; 711 error = getaddrinfo(lhost, "0", &hints, &res); 712 if (error) 713 return (0); 714 715 for (r = res; r ; r = r->ai_next) { 716 h2[0] = '\0'; 717 if (getnameinfo(r->ai_addr, r->ai_addrlen, h2, sizeof(h2), 718 NULL, 0, NI_NUMERICHOST) != 0) 719 continue; 720 if (strcmp(h1, h2) == 0) { 721 freeaddrinfo(res); 722 return (1); 723 } 724 } 725 726 /* No match. */ 727 freeaddrinfo(res); 728 return (0); 729 } 730