1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1983, 1993, 1994 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include "namespace.h" 33 #include <sys/param.h> 34 #include <sys/socket.h> 35 #include <sys/stat.h> 36 37 #include <netinet/in.h> 38 #include <arpa/inet.h> 39 40 #include <signal.h> 41 #include <fcntl.h> 42 #include <netdb.h> 43 #include <stdlib.h> 44 #include <unistd.h> 45 #include <pwd.h> 46 #include <errno.h> 47 #include <stdio.h> 48 #include <ctype.h> 49 #include <string.h> 50 #include <rpc/rpc.h> 51 #ifdef YP 52 #include <rpcsvc/yp_prot.h> 53 #include <rpcsvc/ypclnt.h> 54 #endif 55 #include <arpa/nameser.h> 56 #include "un-namespace.h" 57 #include "libc_private.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 ((p = secure_getenv("RSH")) != NULL) { 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 (void)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 __libc_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 (void)fprintf(stderr, 151 "rcmd: socket: All ports in use\n"); 152 else 153 (void)fprintf(stderr, "rcmd: socket: %s\n", 154 strerror(errno)); 155 freeaddrinfo(res); 156 __libc_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 (void)_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 (void)fprintf(stderr, "%s: %s\n", 172 *ahost, strerror(errno)); 173 freeaddrinfo(res); 174 __libc_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 (void)fprintf(stderr, "connect to address %s: ", 184 paddr); 185 errno = oerrno; 186 perror(0); 187 } 188 if ((ai = ai->ai_next) == NULL) { 189 /* refused && timo <= 16 */ 190 struct timespec time_to_sleep, time_remaining; 191 192 time_to_sleep.tv_sec = timo; 193 time_to_sleep.tv_nsec = 0; 194 (void)_nanosleep(&time_to_sleep, &time_remaining); 195 timo *= 2; 196 ai = res; 197 refused = 0; 198 } 199 if (nres > 1) { 200 getnameinfo(ai->ai_addr, ai->ai_addrlen, paddr, 201 sizeof(paddr), NULL, 0, NI_NUMERICHOST); 202 fprintf(stderr, "Trying %s...\n", paddr); 203 } 204 } 205 lport--; 206 if (fd2p == NULL) { 207 _write(s, "", 1); 208 lport = 0; 209 } else { 210 int s2 = rresvport_af(&lport, ai->ai_family), s3; 211 socklen_t len = ai->ai_addrlen; 212 int nfds; 213 214 if (s2 < 0) 215 goto bad; 216 _listen(s2, 1); 217 (void)snprintf(num, sizeof(num), "%d", lport); 218 if (_write(s, num, strlen(num)+1) != strlen(num)+1) { 219 (void)fprintf(stderr, 220 "rcmd: write (setting up stderr): %s\n", 221 strerror(errno)); 222 (void)_close(s2); 223 goto bad; 224 } 225 nfds = max(s, s2)+1; 226 if(nfds > FD_SETSIZE) { 227 fprintf(stderr, "rcmd: too many files\n"); 228 (void)_close(s2); 229 goto bad; 230 } 231 again: 232 FD_ZERO(&reads); 233 FD_SET(s, &reads); 234 FD_SET(s2, &reads); 235 errno = 0; 236 if (_select(nfds, &reads, 0, 0, 0) < 1 || !FD_ISSET(s2, &reads)){ 237 if (errno != 0) 238 (void)fprintf(stderr, 239 "rcmd: select (setting up stderr): %s\n", 240 strerror(errno)); 241 else 242 (void)fprintf(stderr, 243 "select: protocol failure in circuit setup\n"); 244 (void)_close(s2); 245 goto bad; 246 } 247 s3 = _accept(s2, (struct sockaddr *)&from, &len); 248 switch (from.ss_family) { 249 case AF_INET: 250 aport = ntohs(((struct sockaddr_in *)&from)->sin_port); 251 break; 252 #ifdef INET6 253 case AF_INET6: 254 aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port); 255 break; 256 #endif 257 default: 258 aport = 0; /* error */ 259 break; 260 } 261 /* 262 * XXX careful for ftp bounce attacks. If discovered, shut them 263 * down and check for the real auxiliary channel to connect. 264 */ 265 if (aport == 20) { 266 _close(s3); 267 goto again; 268 } 269 (void)_close(s2); 270 if (s3 < 0) { 271 (void)fprintf(stderr, 272 "rcmd: accept: %s\n", strerror(errno)); 273 lport = 0; 274 goto bad; 275 } 276 *fd2p = s3; 277 if (aport >= IPPORT_RESERVED || aport < IPPORT_RESERVED / 2) { 278 (void)fprintf(stderr, 279 "socket: protocol failure in circuit setup.\n"); 280 goto bad2; 281 } 282 } 283 (void)_write(s, locuser, strlen(locuser)+1); 284 (void)_write(s, remuser, strlen(remuser)+1); 285 (void)_write(s, cmd, strlen(cmd)+1); 286 if (_read(s, &c, 1) != 1) { 287 (void)fprintf(stderr, 288 "rcmd: %s: %s\n", *ahost, strerror(errno)); 289 goto bad2; 290 } 291 if (c != 0) { 292 while (_read(s, &c, 1) == 1) { 293 (void)_write(STDERR_FILENO, &c, 1); 294 if (c == '\n') 295 break; 296 } 297 goto bad2; 298 } 299 __libc_sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL); 300 freeaddrinfo(res); 301 return (s); 302 bad2: 303 if (lport) 304 (void)_close(*fd2p); 305 bad: 306 (void)_close(s); 307 __libc_sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL); 308 freeaddrinfo(res); 309 return (-1); 310 } 311 312 int 313 rresvport(int *port) 314 { 315 return rresvport_af(port, AF_INET); 316 } 317 318 int 319 rresvport_af(int *alport, int family) 320 { 321 int s; 322 struct sockaddr_storage ss; 323 u_short *sport; 324 325 memset(&ss, 0, sizeof(ss)); 326 ss.ss_family = family; 327 switch (family) { 328 case AF_INET: 329 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in); 330 sport = &((struct sockaddr_in *)&ss)->sin_port; 331 ((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY; 332 break; 333 #ifdef INET6 334 case AF_INET6: 335 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in6); 336 sport = &((struct sockaddr_in6 *)&ss)->sin6_port; 337 ((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any; 338 break; 339 #endif 340 default: 341 errno = EAFNOSUPPORT; 342 return -1; 343 } 344 345 s = _socket(ss.ss_family, SOCK_STREAM, 0); 346 if (s < 0) 347 return (-1); 348 #if 0 /* compat_exact_traditional_rresvport_semantics */ 349 sin.sin_port = htons((u_short)*alport); 350 if (_bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0) 351 return (s); 352 if (errno != EADDRINUSE) { 353 (void)_close(s); 354 return (-1); 355 } 356 #endif 357 *sport = 0; 358 if (bindresvport_sa(s, (struct sockaddr *)&ss) == -1) { 359 (void)_close(s); 360 return (-1); 361 } 362 *alport = (int)ntohs(*sport); 363 return (s); 364 } 365 366 int __check_rhosts_file = 1; 367 char *__rcmd_errstr; 368 369 int 370 ruserok(const char *rhost, int superuser, const char *ruser, const char *luser) 371 { 372 struct addrinfo hints, *res, *r; 373 int error; 374 375 memset(&hints, 0, sizeof(hints)); 376 hints.ai_family = PF_UNSPEC; 377 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 378 error = getaddrinfo(rhost, "0", &hints, &res); 379 if (error) 380 return (-1); 381 382 for (r = res; r; r = r->ai_next) { 383 if (iruserok_sa(r->ai_addr, r->ai_addrlen, superuser, ruser, 384 luser) == 0) { 385 freeaddrinfo(res); 386 return (0); 387 } 388 } 389 freeaddrinfo(res); 390 return (-1); 391 } 392 393 /* 394 * New .rhosts strategy: We are passed an ip address. We spin through 395 * hosts.equiv and .rhosts looking for a match. When the .rhosts only 396 * has ip addresses, we don't have to trust a nameserver. When it 397 * contains hostnames, we spin through the list of addresses the nameserver 398 * gives us and look for a match. 399 * 400 * Returns 0 if ok, -1 if not ok. 401 */ 402 int 403 iruserok(unsigned long raddr, int superuser, const char *ruser, 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 <= 0 || 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, "re"); 442 again: 443 if (hostf) { 444 if (__ivaliduser_sa(hostf, raddr, rlen, luser, ruser) == 0) { 445 (void)fclose(hostf); 446 return (0); 447 } 448 (void)fclose(hostf); 449 } 450 if (first == 1 && (__check_rhosts_file || superuser)) { 451 first = 0; 452 if ((pwd = getpwnam(luser)) == NULL) 453 return (-1); 454 (void)strlcpy(pbuf, pwd->pw_dir, sizeof(pbuf)); 455 (void)strlcat(pbuf, "/.rhosts", sizeof(pbuf)); 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 (void)seteuid(pwd->pw_uid); 464 hostf = fopen(pbuf, "re"); 465 (void)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 (void)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