inet/rcmd.c

   1 /*
   2  * Copyright (C) 1998 WIDE Project.
   3  * 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 project 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 PROJECT 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 PROJECT 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 /*
  30  * Copyright (c) 1983, 1993, 1994
  31  *      The Regents of the University of California.  All rights reserved.
  32  *
  33  * Redistribution and use in source and binary forms, with or without
  34  * modification, are permitted provided that the following conditions
  35  * are met:
  36  * 1. Redistributions of source code must retain the above copyright
  37  *    notice, this list of conditions and the following disclaimer.
  38  * 2. Redistributions in binary form must reproduce the above copyright
  39  *    notice, this list of conditions and the following disclaimer in the
  40  *    documentation and/or other materials provided with the distribution.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58 #if defined(LIBC_SCCS) && !defined(lint)
  59 static char sccsid[] = "@(#)rcmd.c      8.3 (Berkeley) 3/26/94";
  60 #endif /* LIBC_SCCS and not lint */
  61
  62 #include <sys/param.h>
  63 #include <sys/poll.h>
  64 #include <sys/socket.h>
  65 #include <sys/stat.h>
  66
  67 #include <netinet/in.h>
  68 #include <arpa/inet.h>
  69
  70 #include <alloca.h>
  71 #include <signal.h>
  72 #include <fcntl.h>
  73 #include <netdb.h>
  74 #include <unistd.h>
  75 #include <pwd.h>
  76 #include <errno.h>
  77 #include <stdio.h>
  78 #include <stdio_ext.h>
  79 #include <ctype.h>
  80 #include <string.h>
  81 #include <libintl.h>
  82 #include <stdlib.h>
  83 #ifdef USE_IN_LIBIO
  84 # include <wchar.h>
  85 #endif
  86
  87
  88 int __ivaliduser (FILE *, u_int32_t, const char *, const char *);
  89 static int __validuser2_sa (FILE *, struct sockaddr *, size_t,
  90                             const char *, const char *, const char *);
  91 static int ruserok2_sa (struct sockaddr *ra, size_t ralen,
  92                         int superuser, const char *ruser,
  93                         const char *luser, const char *rhost);
  94 static int ruserok_sa (struct sockaddr *ra, size_t ralen,
  95                         int superuser, const char *ruser,
  96                         const char *luser);
  97 int iruserok_af (const void *raddr, int superuser, const char *ruser,
  98                  const char *luser, sa_family_t af);
  99 int iruserok (u_int32_t raddr, int superuser, const char *ruser,
 100               const char *luser);
 101
 102 static char ahostbuf[NI_MAXHOST];
 103
 104 int
 105 rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af)
 106         char **ahost;
 107         u_short rport;
 108         const char *locuser, *remuser, *cmd;
 109         int *fd2p;
 110         sa_family_t af;
 111 {
 112         char paddr[INET6_ADDRSTRLEN];
 113         struct addrinfo hints, *res, *ai;
 114         struct sockaddr_storage from;
 115         struct pollfd pfd[2];
 116         int32_t oldmask;
 117         pid_t pid;
 118         int s, lport, timo, error;
 119         char c;
 120         int refused;
 121         char num[8];
 122         ssize_t n;
 123
 124         if (af != AF_INET && af != AF_INET6 && af != AF_UNSPEC)
 125           {
 126             __set_errno (EAFNOSUPPORT);
 127             return -1;
 128           }
 129
 130         pid = __getpid();
 131
 132         memset(&hints, '\0', sizeof(hints));
 133         hints.ai_flags = AI_CANONNAME;
 134         hints.ai_family = af;
 135         hints.ai_socktype = SOCK_STREAM;
 136         (void)__snprintf(num, sizeof(num), "%d", ntohs(rport));
 137         error = getaddrinfo(*ahost, num, &hints, &res);
 138         if (error) {
 139 #ifdef USE_IN_LIBIO
 140                 if (_IO_fwide (stderr, 0) > 0)
 141                         __fwprintf(stderr, L"rcmd: getaddrinfo: %s\n",
 142                                    gai_strerror(error));
 143                 else
 144 #endif
 145                         fprintf(stderr, "rcmd: getaddrinfo: %s\n",
 146                                 gai_strerror(error));
 147                 return (-1);
 148         }
 149
 150         pfd[0].events = POLLIN;
 151         pfd[1].events = POLLIN;
 152
 153         if (res->ai_canonname){
 154                 strncpy(ahostbuf, res->ai_canonname, sizeof(ahostbuf));
 155                 ahostbuf[sizeof(ahostbuf)-1] = '\0';
 156                 *ahost = ahostbuf;
 157         }
 158         else
 159                 *ahost = NULL;
 160         ai = res;
 161         refused = 0;
 162         oldmask = __sigblock(sigmask(SIGURG));
 163         for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
 164                 char errbuf[200];
 165
 166                 s = rresvport_af(&lport, ai->ai_family);
 167                 if (s < 0) {
 168                         if (errno == EAGAIN) {
 169 #ifdef USE_IN_LIBIO
 170                                 if (_IO_fwide (stderr, 0) > 0)
 171                                         __fwprintf(stderr, L"%s",
 172                                                    _("rcmd: socket: All ports in use\n"));
 173                                 else
 174 #endif
 175                                         fputs(_("rcmd: socket: All ports in use\n"),
 176                                               stderr);
 177                         } else {
 178 #ifdef USE_IN_LIBIO
 179                                 if (_IO_fwide (stderr, 0) > 0)
 180                                         __fwprintf(stderr,
 181                                                    L"rcmd: socket: %m\n");
 182                                 else
 183 #endif
 184                                         fprintf(stderr, "rcmd: socket: %m\n");
 185                         }
 186                         __sigsetmask(oldmask);
 187                         freeaddrinfo(res);
 188                         return -1;
 189                 }
 190                 __fcntl(s, F_SETOWN, pid);
 191                 if (__connect(s, ai->ai_addr, ai->ai_addrlen) >= 0)
 192                         break;
 193                 (void)__close(s);
 194                 if (errno == EADDRINUSE) {
 195                         lport--;
 196                         continue;
 197                 }
 198                 if (errno == ECONNREFUSED)
 199                         refused = 1;
 200                 if (ai->ai_next != NULL) {
 201                         int oerrno = errno;
 202                         char *buf = NULL;
 203
 204                         getnameinfo(ai->ai_addr, ai->ai_addrlen,
 205                                     paddr, sizeof(paddr),
 206                                     NULL, 0,
 207                                     NI_NUMERICHOST);
 208
 209                         __asprintf (&buf, _("connect to address %s: "), paddr);
 210 #ifdef USE_IN_LIBIO
 211                         if (_IO_fwide (stderr, 0) > 0)
 212                                 __fwprintf(stderr, L"%s", buf);
 213                         else
 214 #endif
 215                                 fputs (buf, stderr);
 216                         __set_errno (oerrno);
 217                         perror(0);
 218                         ai = ai->ai_next;
 219                         getnameinfo(ai->ai_addr, ai->ai_addrlen,
 220                                     paddr, sizeof(paddr),
 221                                     NULL, 0,
 222                                     NI_NUMERICHOST);
 223                         __asprintf (&buf, _("Trying %s...\n"), paddr);
 224 #ifdef USE_IN_LIBIO
 225                         if (_IO_fwide (stderr, 0) > 0)
 226                                 __fwprintf (stderr, L"%s", buf);
 227                         else
 228 #endif
 229                                 fputs (buf, stderr);
 230                         free (buf);
 231                         continue;
 232                 }
 233                 if (refused && timo <= 16) {
 234                         (void)__sleep(timo);
 235                         timo *= 2;
 236                         ai = res;
 237                         refused = 0;
 238                         continue;
 239                 }
 240                 freeaddrinfo(res);
 241 #ifdef USE_IN_LIBIO
 242                 if (_IO_fwide (stderr, 0) > 0)
 243                         (void)__fwprintf(stderr, L"%s: %s\n", *ahost,
 244                                          __strerror_r(errno,
 245                                                       errbuf, sizeof (errbuf)));
 246                 else
 247 #endif
 248                         (void)fprintf(stderr, "%s: %s\n", *ahost,
 249                                       __strerror_r(errno,
 250                                                    errbuf, sizeof (errbuf)));
 251                 __sigsetmask(oldmask);
 252                 return -1;
 253         }
 254         lport--;
 255         if (fd2p == 0) {
 256                 __write(s, "", 1);
 257                 lport = 0;
 258         } else {
 259                 char num[8];
 260                 int s2 = rresvport_af(&lport, ai->ai_family), s3;
 261                 socklen_t len = ai->ai_addrlen;
 262
 263                 if (s2 < 0)
 264                         goto bad;
 265                 listen(s2, 1);
 266                 (void)__snprintf(num, sizeof(num), "%d", lport);
 267                 if (__write(s, num, strlen(num)+1) != (ssize_t)strlen(num)+1) {
 268                         char *buf = NULL;
 269
 270                         __asprintf (&buf, _("\
 271 rcmd: write (setting up stderr): %m\n"));
 272 #ifdef USE_IN_LIBIO
 273                         if (_IO_fwide (stderr, 0) > 0)
 274                                 __fwprintf(stderr, L"%s", buf);
 275                         else
 276 #endif
 277                                 fputs (buf, stderr);
 278                         free (buf);
 279                         (void)__close(s2);
 280                         goto bad;
 281                 }
 282                 pfd[0].fd = s;
 283                 pfd[1].fd = s2;
 284                 __set_errno (0);
 285                 if (__poll (pfd, 2, -1) < 1 || (pfd[1].revents & POLLIN) == 0){
 286                         char *buf = NULL;
 287
 288                         if (errno != 0)
 289                                 __asprintf(&buf,
 290                                     _("rcmd: poll (setting up stderr): %m\n"));
 291                         else
 292                                 __asprintf(&buf,
 293                              _("poll: protocol failure in circuit setup\n"));
 294 #ifdef USE_IN_LIBIO
 295                         if (_IO_fwide (stderr, 0) > 0)
 296                                 __fwprintf (stderr, L"%s", buf);
 297                         else
 298 #endif
 299                                 fputs (buf, stderr);
 300                         free  (buf);
 301                         (void)__close(s2);
 302                         goto bad;
 303                 }
 304                 s3 = accept(s2, (struct sockaddr *)&from, &len);
 305                 switch (from.ss_family) {
 306                 case AF_INET:
 307                         rport = ntohs(((struct sockaddr_in *)&from)->sin_port);
 308                         break;
 309                 case AF_INET6:
 310                         rport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port);
 311                         break;
 312                 default:
 313                         rport = 0;
 314                         break;
 315                 }
 316                 (void)__close(s2);
 317                 if (s3 < 0) {
 318 #ifdef USE_IN_LIBIO
 319                         if (_IO_fwide (stderr, 0) > 0)
 320                                 (void)__fwprintf(stderr,
 321                                                  L"rcmd: accept: %m\n");
 322                         else
 323 #endif
 324                                 (void)fprintf(stderr,
 325                                               "rcmd: accept: %m\n");
 326                         lport = 0;
 327                         goto bad;
 328                 }
 329                 *fd2p = s3;
 330
 331                 if (rport >= IPPORT_RESERVED || rport < IPPORT_RESERVED / 2){
 332                         char *buf = NULL;
 333
 334                         __asprintf(&buf,
 335                              _("socket: protocol failure in circuit setup\n"));
 336 #ifdef USE_IN_LIBIO
 337                         if (_IO_fwide (stderr, 0) > 0)
 338                                 __fwprintf (stderr, L"%s", buf);
 339                         else
 340 #endif
 341                                 fputs (buf, stderr);
 342                         free (buf);
 343                         goto bad2;
 344                 }
 345         }
 346         (void)__write(s, locuser, strlen(locuser)+1);
 347         (void)__write(s, remuser, strlen(remuser)+1);
 348         (void)__write(s, cmd, strlen(cmd)+1);
 349         n = __read(s, &c, 1);
 350         if (n != 1) {
 351                 char *buf = NULL;
 352
 353                 if (n == 0)
 354                         __asprintf(&buf, _("rcmd: %s: short read"), *ahost);
 355                 else
 356                         __asprintf(&buf, "rcmd: %s: %m\n", *ahost);
 357 #ifdef USE_IN_LIBIO
 358                 if (_IO_fwide (stderr, 0) > 0)
 359                         __fwprintf (stderr, L"%s", buf);
 360                 else
 361 #endif
 362                         fputs (buf, stderr);
 363                 free (buf);
 364                 goto bad2;
 365         }
 366         if (c != 0) {
 367                 while (__read(s, &c, 1) == 1) {
 368                         (void)__write(STDERR_FILENO, &c, 1);
 369                         if (c == '\n')
 370                                 break;
 371                 }
 372                 goto bad2;
 373         }
 374         __sigsetmask(oldmask);
 375         freeaddrinfo(res);
 376         return s;
 377 bad2:
 378         if (lport)
 379                 (void)__close(*fd2p);
 380 bad:
 381         (void)__close(s);
 382         __sigsetmask(oldmask);
 383         freeaddrinfo(res);
 384         return -1;
 385 }
 386
 387 int
 388 rcmd(ahost, rport, locuser, remuser, cmd, fd2p)
 389         char **ahost;
 390         u_short rport;
 391         const char *locuser, *remuser, *cmd;
 392         int *fd2p;
 393 {
 394   return rcmd_af (ahost, rport, locuser, remuser, cmd, fd2p, AF_INET);
 395 }
 396
 397 int
 398 rresvport_af(alport, family)
 399         int *alport;
 400         sa_family_t family;
 401 {
 402         struct sockaddr_storage ss;
 403         int s;
 404         size_t len;
 405         uint16_t *sport;
 406
 407         switch(family){
 408         case AF_INET:
 409                 len = sizeof(struct sockaddr_in);
 410                 sport = &((struct sockaddr_in *)&ss)->sin_port;
 411                 break;
 412         case AF_INET6:
 413                 len = sizeof(struct sockaddr_in6);
 414                 sport = &((struct sockaddr_in6 *)&ss)->sin6_port;
 415                 break;
 416         default:
 417                 __set_errno (EAFNOSUPPORT);
 418                 return -1;
 419         }
 420         s = __socket(family, SOCK_STREAM, 0);
 421         if (s < 0)
 422                 return -1;
 423
 424         memset (&ss, '\0', sizeof(ss));
 425 #ifdef SALEN
 426         ss.__ss_len = len;
 427 #endif
 428         ss.ss_family = family;
 429
 430         for (;;) {
 431                 *sport = htons((uint16_t) *alport);
 432                 if (bind(s, (struct sockaddr *)&ss, len) >= 0)
 433                         return s;
 434                 if (errno != EADDRINUSE) {
 435                         (void)__close(s);
 436                         return -1;
 437                 }
 438                 (*alport)--;
 439                 if (*alport == IPPORT_RESERVED/2)
 440                         break;
 441         }
 442         (void)__close(s);
 443         __set_errno (EAGAIN);
 444         return -1;
 445 }
 446
 447 int
 448 rresvport(alport)
 449         int *alport;
 450 {
 451         return rresvport_af(alport, AF_INET);
 452 }
 453
 454 int     __check_rhosts_file = 1;
 455 char    *__rcmd_errstr;
 456
 457 int
 458 ruserok_af(rhost, superuser, ruser, luser, af)
 459         const char *rhost, *ruser, *luser;
 460         int superuser;
 461         sa_family_t af;
 462 {
 463         struct addrinfo hints, *res, *res0;
 464         int gai;
 465         int ret;
 466
 467         memset (&hints, '\0', sizeof(hints));
 468         hints.ai_family = af;
 469         gai = getaddrinfo(rhost, NULL, &hints, &res0);
 470         if (gai)
 471                 return -1;
 472         ret = -1;
 473         for (res=res0; res; res=res->ai_next)
 474                 if (ruserok2_sa(res->ai_addr, res->ai_addrlen,
 475                                 superuser, ruser, luser, rhost) == 0){
 476                         ret = 0;
 477                         break;
 478                 }
 479         freeaddrinfo(res0);
 480         return (ret);
 481 }
 482 int
 483 ruserok(rhost, superuser, ruser, luser)
 484         const char *rhost, *ruser, *luser;
 485         int superuser;
 486 {
 487         return ruserok_af(rhost, superuser, ruser, luser, AF_INET);
 488 }
 489
 490 /* Extremely paranoid file open function. */
 491 static FILE *
 492 iruserfopen (const char *file, uid_t okuser)
 493 {
 494   struct stat64 st;
 495   char *cp = NULL;
 496   FILE *res = NULL;
 497
 498   /* If not a regular file, if owned by someone other than user or
 499      root, if writeable by anyone but the owner, or if hardlinked
 500      anywhere, quit.  */
 501   cp = NULL;
 502   if (__lxstat64 (_STAT_VER, file, &st))
 503     cp = _("lstat failed");
 504   else if (!S_ISREG (st.st_mode))
 505     cp = _("not regular file");
 506   else
 507     {
 508       res = fopen (file, "r");
 509       if (!res)
 510         cp = _("cannot open");
 511       else if (__fxstat64 (_STAT_VER, fileno (res), &st) < 0)
 512         cp = _("fstat failed");
 513       else if (st.st_uid && st.st_uid != okuser)
 514         cp = _("bad owner");
 515       else if (st.st_mode & (S_IWGRP|S_IWOTH))
 516         cp = _("writeable by other than owner");
 517       else if (st.st_nlink > 1)
 518         cp = _("hard linked somewhere");
 519     }
 520
 521   /* If there were any problems, quit.  */
 522   if (cp != NULL)
 523     {
 524       __rcmd_errstr = cp;
 525       if (res)
 526         fclose (res);
 527       return NULL;
 528     }
 529
 530   /* No threads use this stream.  */
 531   __fsetlocking (res, FSETLOCKING_BYCALLER);
 532
 533   return res;
 534 }
 535
 536 /*
 537  * New .rhosts strategy: We are passed an ip address. We spin through
 538  * hosts.equiv and .rhosts looking for a match. When the .rhosts only
 539  * has ip addresses, we don't have to trust a nameserver.  When it
 540  * contains hostnames, we spin through the list of addresses the nameserver
 541  * gives us and look for a match.
 542  *
 543  * Returns 0 if ok, -1 if not ok.
 544  */
 545 static int
 546 ruserok2_sa (ra, ralen, superuser, ruser, luser, rhost)
 547      struct sockaddr *ra;
 548      size_t ralen;
 549      int superuser;
 550      const char *ruser, *luser, *rhost;
 551 {
 552   FILE *hostf = NULL;
 553   int isbad = -1;
 554
 555   if (!superuser)
 556     hostf = iruserfopen (_PATH_HEQUIV, 0);
 557
 558   if (hostf)
 559     {
 560       isbad = __validuser2_sa (hostf, ra, ralen, luser, ruser, rhost);
 561       fclose (hostf);
 562
 563       if (!isbad)
 564         return 0;
 565     }
 566
 567   if (__check_rhosts_file || superuser)
 568     {
 569       char *pbuf;
 570       struct passwd pwdbuf, *pwd;
 571       size_t dirlen;
 572       size_t buflen = __sysconf (_SC_GETPW_R_SIZE_MAX);
 573       char *buffer = __alloca (buflen);
 574       uid_t uid;
 575
 576       if (__getpwnam_r (luser, &pwdbuf, buffer, buflen, &pwd) != 0
 577           || pwd == NULL)
 578         return -1;
 579
 580       dirlen = strlen (pwd->pw_dir);
 581       pbuf = alloca (dirlen + sizeof "/.rhosts");
 582       __mempcpy (__mempcpy (pbuf, pwd->pw_dir, dirlen),
 583                  "/.rhosts", sizeof "/.rhosts");
 584
 585        /* Change effective uid while reading .rhosts.  If root and
 586           reading an NFS mounted file system, can't read files that
 587           are protected read/write owner only.  */
 588        uid = __geteuid ();
 589        seteuid (pwd->pw_uid);
 590        hostf = iruserfopen (pbuf, pwd->pw_uid);
 591
 592        if (hostf != NULL)
 593          {
 594            isbad = __validuser2_sa (hostf, ra, ralen, luser, ruser, rhost);
 595            fclose (hostf);
 596          }
 597
 598        seteuid (uid);
 599        return isbad;
 600     }
 601   return -1;
 602 }
 603 /*
 604  * ruserok_sa() is now discussed on ipng, so
 605  * currently disabled for external use
 606  */
 607 static int ruserok_sa(ra, ralen, superuser, ruser, luser)
 608      struct sockaddr *ra;
 609      size_t ralen;
 610      int superuser;
 611      const char *ruser, *luser;
 612 {
 613   return ruserok2_sa(ra, ralen, superuser, ruser, luser, "-");
 614 }
 615
 616 /* This is the exported version.  */
 617 int
 618 iruserok_af (raddr, superuser, ruser, luser, af)
 619      const void *raddr;
 620      int superuser;
 621      const char *ruser, *luser;
 622      sa_family_t af;
 623 {
 624   struct sockaddr_storage ra;
 625   size_t ralen;
 626
 627   memset (&ra, '\0', sizeof(ra));
 628   switch (af){
 629   case AF_INET:
 630     ((struct sockaddr_in *)&ra)->sin_family = AF_INET;
 631     memcpy (&(((struct sockaddr_in *)&ra)->sin_addr), raddr,
 632             sizeof(struct in_addr));
 633     ralen = sizeof(struct sockaddr_in);
 634     break;
 635   case AF_INET6:
 636     ((struct sockaddr_in6 *)&ra)->sin6_family = AF_INET6;
 637     memcpy (&(((struct sockaddr_in6 *)&ra)->sin6_addr), raddr,
 638             sizeof(struct in6_addr));
 639     ralen = sizeof(struct sockaddr_in6);
 640     break;
 641   default:
 642     return 0;
 643   }
 644   return ruserok_sa ((struct sockaddr *)&ra, ralen, superuser, ruser, luser);
 645 }
 646 int
 647 iruserok (raddr, superuser, ruser, luser)
 648      u_int32_t raddr;
 649      int superuser;
 650      const char *ruser, *luser;
 651 {
 652   return iruserok_af (&raddr, superuser, ruser, luser, AF_INET);
 653 }
 654
 655 /*
 656  * XXX
 657  * Don't make static, used by lpd(8).
 658  *
 659  * This function is not used anymore. It is only present because lpd(8)
 660  * calls it (!?!). We simply call __invaliduser2() with an illegal rhost
 661  * argument. This means that netgroups won't work in .rhost/hosts.equiv
 662  * files. If you want lpd to work with netgroups, fix lpd to use ruserok()
 663  * or PAM.
 664  * Returns 0 if ok, -1 if not ok.
 665  */
 666 int
 667 __ivaliduser(hostf, raddr, luser, ruser)
 668         FILE *hostf;
 669         u_int32_t raddr;
 670         const char *luser, *ruser;
 671 {
 672         struct sockaddr_in ra;
 673         memset(&ra, '\0', sizeof(ra));
 674         ra.sin_family = AF_INET;
 675         ra.sin_addr.s_addr = raddr;
 676         return __validuser2_sa(hostf, (struct sockaddr *)&ra, sizeof(ra),
 677                                luser, ruser, "-");
 678 }
 679
 680
 681 /* Returns 1 on positive match, 0 on no match, -1 on negative match.  */
 682 static int
 683 internal_function
 684 __checkhost_sa (struct sockaddr *ra, size_t ralen, char *lhost,
 685                 const char *rhost)
 686 {
 687         struct addrinfo hints, *res0, *res;
 688         char raddr[INET6_ADDRSTRLEN];
 689         int match;
 690         int negate=1;    /* Multiply return with this to get -1 instead of 1 */
 691
 692         /* Check nis netgroup.  */
 693         if (strncmp ("+@", lhost, 2) == 0)
 694                 return innetgr (&lhost[2], rhost, NULL, NULL);
 695
 696         if (strncmp ("-@", lhost, 2) == 0)
 697                 return -innetgr (&lhost[2], rhost, NULL, NULL);
 698
 699         /* -host */
 700         if (strncmp ("-", lhost,1) == 0) {
 701                 negate = -1;
 702                 lhost++;
 703         } else if (strcmp ("+",lhost) == 0) {
 704                 return 1;                    /* asking for trouble, but ok.. */
 705         }
 706
 707         /* Try for raw ip address first. */
 708         /* XXX */
 709         if (getnameinfo(ra, ralen,
 710                         raddr, sizeof(raddr), NULL, 0,
 711                         NI_NUMERICHOST) == 0
 712             && strcmp(raddr, lhost) == 0)
 713                 return negate;
 714
 715         /* Better be a hostname. */
 716         match = 0;
 717         memset(&hints, '\0', sizeof(hints));
 718         hints.ai_family = ra->sa_family;
 719         if (getaddrinfo(lhost, NULL, &hints, &res0) == 0){
 720                 /* Spin through ip addresses. */
 721                 for (res = res0; res; res = res->ai_next)
 722                   {
 723                     if (res->ai_family == ra->sa_family
 724                         && !memcmp(res->ai_addr, ra, res->ai_addrlen))
 725                       {
 726                         match = 1;
 727                         break;
 728                       }
 729                   }
 730                 freeaddrinfo (res0);
 731         }
 732         return negate * match;
 733 }
 734
 735 /* Returns 1 on positive match, 0 on no match, -1 on negative match.  */
 736 static int
 737 internal_function
 738 __icheckuser (const char *luser, const char *ruser)
 739 {
 740     /*
 741       luser is user entry from .rhosts/hosts.equiv file
 742       ruser is user id on remote host
 743       */
 744
 745     /* [-+]@netgroup */
 746     if (strncmp ("+@", luser, 2) == 0)
 747         return innetgr (&luser[2], NULL, ruser, NULL);
 748
 749     if (strncmp ("-@", luser,2) == 0)
 750         return -innetgr (&luser[2], NULL, ruser, NULL);
 751
 752     /* -user */
 753     if (strncmp ("-", luser, 1) == 0)
 754         return -(strcmp (&luser[1], ruser) == 0);
 755
 756     /* + */
 757     if (strcmp ("+", luser) == 0)
 758         return 1;
 759
 760     /* simple string match */
 761     return strcmp (ruser, luser) == 0;
 762 }
 763
 764 /*
 765  * Returns 1 for blank lines (or only comment lines) and 0 otherwise
 766  */
 767 static int
 768 __isempty (char *p)
 769 {
 770     while (*p && isspace (*p)) {
 771         ++p;
 772     }
 773
 774     return (*p == '\0' || *p == '#') ? 1 : 0 ;
 775 }
 776
 777 /*
 778  * Returns 0 if positive match, -1 if _not_ ok.
 779  */
 780 static int
 781 __validuser2_sa(hostf, ra, ralen, luser, ruser, rhost)
 782         FILE *hostf;
 783         struct sockaddr *ra;
 784         size_t ralen;
 785         const char *luser, *ruser, *rhost;
 786 {
 787     register const char *user;
 788     register char *p;
 789     int hcheck, ucheck;
 790     char *buf = NULL;
 791     size_t bufsize = 0;
 792     int retval = -1;
 793
 794     while (__getline (&buf, &bufsize, hostf) > 0) {
 795         buf[bufsize - 1] = '\0'; /* Make sure it's terminated.  */
 796         p = buf;
 797
 798         /* Skip empty or comment lines */
 799         if (__isempty (p)) {
 800             continue;
 801         }
 802
 803         /* Skip lines that are too long. */
 804         if (strchr (p, '\n') == NULL) {
 805             int ch = getc_unlocked (hostf);
 806
 807             while (ch != '\n' && ch != EOF)
 808                 ch = getc_unlocked (hostf);
 809             continue;
 810         }
 811
 812         for (;*p && !isspace(*p); ++p) {
 813             *p = _tolower (*p);
 814         }
 815
 816         /* Next we want to find the permitted name for the remote user.  */
 817         if (*p == ' ' || *p == '\t') {
 818             /* <nul> terminate hostname and skip spaces */
 819             for (*p++='\0'; *p && isspace (*p); ++p);
 820
 821             user = p;                   /* this is the user's name */
 822             while (*p && !isspace (*p))
 823                 ++p;                    /* find end of user's name */
 824         } else
 825             user = p;
 826
 827         *p = '\0';              /* <nul> terminate username (+host?) */
 828
 829         /* buf -> host(?) ; user -> username(?) */
 830
 831         /* First check host part */
 832         hcheck = __checkhost_sa (ra, ralen, buf, rhost);
 833
 834         if (hcheck < 0)
 835             break;
 836
 837         if (hcheck) {
 838             /* Then check user part */
 839             if (! (*user))
 840                 user = luser;
 841
 842             ucheck = __icheckuser (user, ruser);
 843
 844             /* Positive 'host user' match? */
 845             if (ucheck > 0) {
 846                 retval = 0;
 847                 break;
 848             }
 849
 850             /* Negative 'host -user' match? */
 851             if (ucheck < 0)
 852                 break;
 853
 854             /* Neither, go on looking for match */
 855         }
 856     }
 857
 858     if (buf != NULL)
 859       free (buf);
 860
 861     return retval;
 862 }