sbin/mount_nfs/mount_nfs.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1992, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Rick Macklem at The University of Guelph.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #if 0
  36 #ifndef lint
  37 static const char copyright[] =
  38 "@(#) Copyright (c) 1992, 1993, 1994\n\
  39         The Regents of the University of California.  All rights reserved.\n";
  40 #endif /* not lint */
  41
  42 #ifndef lint
  43 static char sccsid[] = "@(#)mount_nfs.c 8.11 (Berkeley) 5/4/95";
  44 #endif /* not lint */
  45 #endif
  46 #include <sys/cdefs.h>
  47 __FBSDID("$FreeBSD$");
  48
  49 #include <sys/param.h>
  50 #include <sys/linker.h>
  51 #include <sys/module.h>
  52 #include <sys/mount.h>
  53 #include <sys/socket.h>
  54 #include <sys/stat.h>
  55 #include <sys/syslog.h>
  56 #include <sys/uio.h>
  57
  58 #include <rpc/rpc.h>
  59 #include <rpc/pmap_clnt.h>
  60 #include <rpc/pmap_prot.h>
  61 #include <rpcsvc/nfs_prot.h>
  62 #include <rpcsvc/mount.h>
  63
  64 #include <fs/nfs/nfsproto.h>
  65 #include <fs/nfs/nfsv4_errstr.h>
  66
  67 #include <arpa/inet.h>
  68 #include <net/route.h>
  69 #include <net/if.h>
  70
  71 #include <ctype.h>
  72 #include <err.h>
  73 #include <errno.h>
  74 #include <fcntl.h>
  75 #include <netdb.h>
  76 #include <stdio.h>
  77 #include <stdlib.h>
  78 #include <string.h>
  79 #include <strings.h>
  80 #include <sysexits.h>
  81 #include <unistd.h>
  82
  83 #include "mntopts.h"
  84 #include "mounttab.h"
  85
  86 /* Table for af,sotype -> netid conversions. */
  87 static struct nc_protos {
  88         const char *netid;
  89         int af;
  90         int sotype;
  91 } nc_protos[] = {
  92         {"udp",         AF_INET,        SOCK_DGRAM},
  93         {"tcp",         AF_INET,        SOCK_STREAM},
  94         {"udp6",        AF_INET6,       SOCK_DGRAM},
  95         {"tcp6",        AF_INET6,       SOCK_STREAM},
  96         {NULL,          0,              0}
  97 };
  98
  99 struct nfhret {
 100         u_long          stat;
 101         long            vers;
 102         long            auth;
 103         long            fhsize;
 104         u_char          nfh[NFS3_FHSIZE];
 105 };
 106 #define BGRND   1
 107 #define ISBGRND 2
 108 #define OF_NOINET4      4
 109 #define OF_NOINET6      8
 110 static int retrycnt = -1;
 111 static int opflags = 0;
 112 static int nfsproto = IPPROTO_TCP;
 113 static int mnttcp_ok = 1;
 114 static int noconn = 0;
 115 /* The 'portspec' is the server nfs port; NULL means look up via rpcbind. */
 116 static const char *portspec = NULL;
 117 static struct sockaddr *addr;
 118 static int addrlen = 0;
 119 static u_char *fh = NULL;
 120 static int fhsize = 0;
 121 static int secflavor = -1;
 122 static int got_principal = 0;
 123
 124 static enum mountmode {
 125         ANY,
 126         V2,
 127         V3,
 128         V4
 129 } mountmode = ANY;
 130
 131 /* Return codes for nfs_tryproto. */
 132 enum tryret {
 133         TRYRET_SUCCESS,
 134         TRYRET_TIMEOUT,         /* No response received. */
 135         TRYRET_REMOTEERR,       /* Error received from remote server. */
 136         TRYRET_LOCALERR         /* Local failure. */
 137 };
 138
 139 static int      sec_name_to_num(const char *sec);
 140 static const char       *sec_num_to_name(int num);
 141 static int      getnfsargs(char *, struct iovec **iov, int *iovlen);
 142 /* void set_rpc_maxgrouplist(int); */
 143 static struct netconfig *getnetconf_cached(const char *netid);
 144 static const char       *netidbytype(int af, int sotype);
 145 static void     usage(void) __dead2;
 146 static int      xdr_dir(XDR *, char *);
 147 static int      xdr_fh(XDR *, struct nfhret *);
 148 static enum tryret nfs_tryproto(struct addrinfo *ai, char *hostp, char *spec,
 149     char **errstr, struct iovec **iov, int *iovlen);
 150 static enum tryret returncode(enum clnt_stat stat, struct rpc_err *rpcerr);
 151
 152 int
 153 main(int argc, char *argv[])
 154 {
 155         int c;
 156         struct iovec *iov;
 157         int num, iovlen;
 158         char *mntname, *p, *spec, *tmp;
 159         char mntpath[MAXPATHLEN], errmsg[255];
 160         char hostname[MAXHOSTNAMELEN + 1], gssn[MAXHOSTNAMELEN + 50];
 161         const char *gssname, *nmount_errstr;
 162
 163         iov = NULL;
 164         iovlen = 0;
 165         memset(errmsg, 0, sizeof(errmsg));
 166         gssname = NULL;
 167
 168         while ((c = getopt(argc, argv,
 169             "23a:bcdD:g:I:iLlNo:PR:r:sTt:w:x:U")) != -1)
 170                 switch (c) {
 171                 case '2':
 172                         mountmode = V2;
 173                         break;
 174                 case '3':
 175                         mountmode = V3;
 176                         break;
 177                 case 'a':
 178                         printf("-a deprecated, use -o readahead=<value>\n");
 179                         build_iovec(&iov, &iovlen, "readahead", optarg, (size_t)-1);
 180                         break;
 181                 case 'b':
 182                         opflags |= BGRND;
 183                         break;
 184                 case 'c':
 185                         printf("-c deprecated, use -o noconn\n");
 186                         build_iovec(&iov, &iovlen, "noconn", NULL, 0);
 187                         noconn = 1;
 188                         break;
 189                 case 'D':
 190                         printf("-D deprecated, use -o deadthresh=<value>\n");
 191                         build_iovec(&iov, &iovlen, "deadthresh", optarg, (size_t)-1);
 192                         break;
 193                 case 'd':
 194                         printf("-d deprecated, use -o dumbtimer");
 195                         build_iovec(&iov, &iovlen, "dumbtimer", NULL, 0);
 196                         break;
 197                 case 'g':
 198                         printf("-g deprecated, use -o maxgroups");
 199                         num = strtol(optarg, &p, 10);
 200                         if (*p || num <= 0)
 201                                 errx(1, "illegal -g value -- %s", optarg);
 202                         //set_rpc_maxgrouplist(num);
 203                         build_iovec(&iov, &iovlen, "maxgroups", optarg, (size_t)-1);
 204                         break;
 205                 case 'I':
 206                         printf("-I deprecated, use -o readdirsize=<value>\n");
 207                         build_iovec(&iov, &iovlen, "readdirsize", optarg, (size_t)-1);
 208                         break;
 209                 case 'i':
 210                         printf("-i deprecated, use -o intr\n");
 211                         build_iovec(&iov, &iovlen, "intr", NULL, 0);
 212                         break;
 213                 case 'L':
 214                         printf("-L deprecated, use -o nolockd\n");
 215                         build_iovec(&iov, &iovlen, "nolockd", NULL, 0);
 216                         break;
 217                 case 'l':
 218                         printf("-l deprecated, -o rdirplus\n");
 219                         build_iovec(&iov, &iovlen, "rdirplus", NULL, 0);
 220                         break;
 221                 case 'N':
 222                         printf("-N deprecated, do not specify -o resvport\n");
 223                         break;
 224                 case 'o': {
 225                         int pass_flag_to_nmount;
 226                         char *opt = optarg;
 227                         while (opt) {
 228                                 char *pval = NULL;
 229                                 char *pnextopt = NULL;
 230                                 const char *val = "";
 231                                 pass_flag_to_nmount = 1;
 232                                 pnextopt = strchr(opt, ',');
 233                                 if (pnextopt != NULL) {
 234                                         *pnextopt = '\0';
 235                                         pnextopt++;
 236                                 }
 237                                 pval = strchr(opt, '=');
 238                                 if (pval != NULL) {
 239                                         *pval = '\0';
 240                                         val = pval + 1;
 241                                 }
 242                                 if (strcmp(opt, "bg") == 0) {
 243                                         opflags |= BGRND;
 244                                         pass_flag_to_nmount=0;
 245                                 } else if (strcmp(opt, "fg") == 0) {
 246                                         /* same as not specifying -o bg */
 247                                         pass_flag_to_nmount=0;
 248                                 } else if (strcmp(opt, "gssname") == 0) {
 249                                         pass_flag_to_nmount = 0;
 250                                         gssname = val;
 251                                 } else if (strcmp(opt, "mntudp") == 0) {
 252                                         mnttcp_ok = 0;
 253                                         nfsproto = IPPROTO_UDP;
 254                                 } else if (strcmp(opt, "udp") == 0) {
 255                                         nfsproto = IPPROTO_UDP;
 256                                 } else if (strcmp(opt, "tcp") == 0) {
 257                                         nfsproto = IPPROTO_TCP;
 258                                 } else if (strcmp(opt, "noinet4") == 0) {
 259                                         pass_flag_to_nmount=0;
 260                                         opflags |= OF_NOINET4;
 261                                 } else if (strcmp(opt, "noinet6") == 0) {
 262                                         pass_flag_to_nmount=0;
 263                                         opflags |= OF_NOINET6;
 264                                 } else if (strcmp(opt, "noconn") == 0) {
 265                                         noconn = 1;
 266                                 } else if (strcmp(opt, "nfsv2") == 0) {
 267                                         pass_flag_to_nmount=0;
 268                                         mountmode = V2;
 269                                 } else if (strcmp(opt, "nfsv3") == 0) {
 270                                         mountmode = V3;
 271                                 } else if (strcmp(opt, "nfsv4") == 0) {
 272                                         pass_flag_to_nmount=0;
 273                                         mountmode = V4;
 274                                         nfsproto = IPPROTO_TCP;
 275                                         if (portspec == NULL)
 276                                                 portspec = "2049";
 277                                 } else if (strcmp(opt, "port") == 0) {
 278                                         pass_flag_to_nmount=0;
 279                                         asprintf(&tmp, "%d", atoi(val));
 280                                         if (tmp == NULL)
 281                                                 err(1, "asprintf");
 282                                         portspec = tmp;
 283                                 } else if (strcmp(opt, "principal") == 0) {
 284                                         got_principal = 1;
 285                                 } else if (strcmp(opt, "proto") == 0) {
 286                                         pass_flag_to_nmount=0;
 287                                         if (strcmp(val, "tcp") == 0) {
 288                                                 nfsproto = IPPROTO_TCP;
 289                                                 opflags |= OF_NOINET6;
 290                                                 build_iovec(&iov, &iovlen,
 291                                                     "tcp", NULL, 0);
 292                                         } else if (strcmp(val, "udp") == 0) {
 293                                                 mnttcp_ok = 0;
 294                                                 nfsproto = IPPROTO_UDP;
 295                                                 opflags |= OF_NOINET6;
 296                                                 build_iovec(&iov, &iovlen,
 297                                                     "udp", NULL, 0);
 298                                         } else if (strcmp(val, "tcp6") == 0) {
 299                                                 nfsproto = IPPROTO_TCP;
 300                                                 opflags |= OF_NOINET4;
 301                                                 build_iovec(&iov, &iovlen,
 302                                                     "tcp", NULL, 0);
 303                                         } else if (strcmp(val, "udp6") == 0) {
 304                                                 mnttcp_ok = 0;
 305                                                 nfsproto = IPPROTO_UDP;
 306                                                 opflags |= OF_NOINET4;
 307                                                 build_iovec(&iov, &iovlen,
 308                                                     "udp", NULL, 0);
 309                                         } else {
 310                                                 errx(1,
 311                                                     "illegal proto value -- %s",
 312                                                     val);
 313                                         }
 314                                 } else if (strcmp(opt, "sec") == 0) {
 315                                         /*
 316                                          * Don't add this option to
 317                                          * the iovec yet - we will
 318                                          * negotiate which sec flavor
 319                                          * to use with the remote
 320                                          * mountd.
 321                                          */
 322                                         pass_flag_to_nmount=0;
 323                                         secflavor = sec_name_to_num(val);
 324                                         if (secflavor < 0) {
 325                                                 errx(1,
 326                                                     "illegal sec value -- %s",
 327                                                     val);
 328                                         }
 329                                 } else if (strcmp(opt, "retrycnt") == 0) {
 330                                         pass_flag_to_nmount=0;
 331                                         num = strtol(val, &p, 10);
 332                                         if (*p || num < 0)
 333                                                 errx(1, "illegal retrycnt value -- %s", val);
 334                                         retrycnt = num;
 335                                 } else if (strcmp(opt, "maxgroups") == 0) {
 336                                         num = strtol(val, &p, 10);
 337                                         if (*p || num <= 0)
 338                                                 errx(1, "illegal maxgroups value -- %s", val);
 339                                         //set_rpc_maxgrouplist(num);
 340                                 } else if (strcmp(opt, "vers") == 0) {
 341                                         num = strtol(val, &p, 10);
 342                                         if (*p || num <= 0)
 343                                                 errx(1, "illegal vers value -- "
 344                                                     "%s", val);
 345                                         switch (num) {
 346                                         case 2:
 347                                                 mountmode = V2;
 348                                                 break;
 349                                         case 3:
 350                                                 mountmode = V3;
 351                                                 build_iovec(&iov, &iovlen,
 352                                                     "nfsv3", NULL, 0);
 353                                                 break;
 354                                         case 4:
 355                                                 mountmode = V4;
 356                                                 nfsproto = IPPROTO_TCP;
 357                                                 if (portspec == NULL)
 358                                                         portspec = "2049";
 359                                                 break;
 360                                         default:
 361                                                 errx(1, "illegal nfs version "
 362                                                     "value -- %s", val);
 363                                         }
 364                                         pass_flag_to_nmount=0;
 365                                 }
 366                                 if (pass_flag_to_nmount) {
 367                                         build_iovec(&iov, &iovlen, opt,
 368                                             __DECONST(void *, val),
 369                                             strlen(val) + 1);
 370                                 }
 371                                 opt = pnextopt;
 372                         }
 373                         }
 374                         break;
 375                 case 'P':
 376                         /* obsolete for -o noresvport now default */
 377                         printf("-P deprecated, use -o noresvport\n");
 378                         build_iovec(&iov, &iovlen, "noresvport", NULL, 0);
 379                         break;
 380                 case 'R':
 381                         printf("-R deprecated, use -o retrycnt=<retrycnt>\n");
 382                         num = strtol(optarg, &p, 10);
 383                         if (*p || num < 0)
 384                                 errx(1, "illegal -R value -- %s", optarg);
 385                         retrycnt = num;
 386                         break;
 387                 case 'r':
 388                         printf("-r deprecated, use -o rsize=<rsize>\n");
 389                         build_iovec(&iov, &iovlen, "rsize", optarg, (size_t)-1);
 390                         break;
 391                 case 's':
 392                         printf("-s deprecated, use -o soft\n");
 393                         build_iovec(&iov, &iovlen, "soft", NULL, 0);
 394                         break;
 395                 case 'T':
 396                         nfsproto = IPPROTO_TCP;
 397                         printf("-T deprecated, use -o tcp\n");
 398                         break;
 399                 case 't':
 400                         printf("-t deprecated, use -o timeout=<value>\n");
 401                         build_iovec(&iov, &iovlen, "timeout", optarg, (size_t)-1);
 402                         break;
 403                 case 'w':
 404                         printf("-w deprecated, use -o wsize=<value>\n");
 405                         build_iovec(&iov, &iovlen, "wsize", optarg, (size_t)-1);
 406                         break;
 407                 case 'x':
 408                         printf("-x deprecated, use -o retrans=<value>\n");
 409                         build_iovec(&iov, &iovlen, "retrans", optarg, (size_t)-1);
 410                         break;
 411                 case 'U':
 412                         printf("-U deprecated, use -o mntudp\n");
 413                         mnttcp_ok = 0;
 414                         nfsproto = IPPROTO_UDP;
 415                         build_iovec(&iov, &iovlen, "mntudp", NULL, 0);
 416                         break;
 417                 default:
 418                         usage();
 419                         break;
 420                 }
 421         argc -= optind;
 422         argv += optind;
 423
 424         if (argc != 2) {
 425                 usage();
 426                 /* NOTREACHED */
 427         }
 428
 429         spec = *argv++;
 430         mntname = *argv;
 431
 432         if (retrycnt == -1)
 433                 /* The default is to keep retrying forever. */
 434                 retrycnt = 0;
 435
 436         if (modfind("nfscl") < 0) {
 437                 /* Not present in kernel, try loading it */
 438                 if (kldload("nfscl") < 0 ||
 439                     modfind("nfscl") < 0)
 440                         errx(1, "nfscl is not available");
 441         }
 442
 443         /*
 444          * Add the fqdn to the gssname, as required.
 445          */
 446         if (gssname != NULL) {
 447                 if (strchr(gssname, '@') == NULL &&
 448                     gethostname(hostname, MAXHOSTNAMELEN) == 0) {
 449                         snprintf(gssn, sizeof (gssn), "%s@%s", gssname,
 450                             hostname);
 451                         gssname = gssn;
 452                 }
 453                 build_iovec(&iov, &iovlen, "gssname",
 454                     __DECONST(void *, gssname), strlen(gssname) + 1);
 455         }
 456
 457         if (!getnfsargs(spec, &iov, &iovlen))
 458                 exit(1);
 459
 460         /* resolve the mountpoint with realpath(3) */
 461         if (checkpath(mntname, mntpath) != 0)
 462                 err(1, "%s", mntpath);
 463
 464         build_iovec_argf(&iov, &iovlen, "fstype", "nfs");
 465         build_iovec(&iov, &iovlen, "fspath", mntpath, (size_t)-1);
 466         build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
 467
 468         if (nmount(iov, iovlen, 0)) {
 469                 nmount_errstr = nfsv4_geterrstr(errno);
 470                 if (mountmode == V4 && nmount_errstr != NULL)
 471                         errx(1, "nmount: %s, %s", mntpath, nmount_errstr);
 472                 else
 473                         err(1, "nmount: %s%s%s", mntpath, errmsg[0] ? ", " : "",
 474                             errmsg);
 475         }
 476
 477         exit(0);
 478 }
 479
 480 static int
 481 sec_name_to_num(const char *sec)
 482 {
 483         if (!strcmp(sec, "krb5"))
 484                 return (RPCSEC_GSS_KRB5);
 485         if (!strcmp(sec, "krb5i"))
 486                 return (RPCSEC_GSS_KRB5I);
 487         if (!strcmp(sec, "krb5p"))
 488                 return (RPCSEC_GSS_KRB5P);
 489         if (!strcmp(sec, "sys"))
 490                 return (AUTH_SYS);
 491         return (-1);
 492 }
 493
 494 static const char *
 495 sec_num_to_name(int flavor)
 496 {
 497         switch (flavor) {
 498         case RPCSEC_GSS_KRB5:
 499                 return ("krb5");
 500         case RPCSEC_GSS_KRB5I:
 501                 return ("krb5i");
 502         case RPCSEC_GSS_KRB5P:
 503                 return ("krb5p");
 504         case AUTH_SYS:
 505                 return ("sys");
 506         }
 507         return (NULL);
 508 }
 509
 510 /*
 511  * Wait for RTM_IFINFO message with interface that is IFF_UP and with
 512  * link on, or until timeout expires.  Returns seconds left.
 513  */
 514 static time_t
 515 rtm_ifinfo_sleep(time_t sec)
 516 {
 517         char buf[2048] __aligned(__alignof(struct if_msghdr));
 518         fd_set rfds;
 519         struct timeval tv, start;
 520         ssize_t nread;
 521         int n, s;
 522
 523         s = socket(PF_ROUTE, SOCK_RAW, 0);
 524         if (s < 0)
 525                 err(EX_OSERR, "socket");
 526         (void)gettimeofday(&start, NULL);
 527
 528         for (tv.tv_sec = sec, tv.tv_usec = 0;
 529             tv.tv_sec > 0;
 530             (void)gettimeofday(&tv, NULL),
 531             tv.tv_sec = sec - (tv.tv_sec - start.tv_sec)) {
 532                 FD_ZERO(&rfds);
 533                 FD_SET(s, &rfds);
 534                 n = select(s + 1, &rfds, NULL, NULL, &tv);
 535                 if (n == 0)
 536                         continue;
 537                 if (n == -1) {
 538                         if (errno == EINTR)
 539                                 continue;
 540                         else
 541                                 err(EX_SOFTWARE, "select");
 542                 }
 543                 nread = read(s, buf, 2048);
 544                 if (nread < 0)
 545                         err(EX_OSERR, "read");
 546                 if ((size_t)nread >= sizeof(struct if_msghdr)) {
 547                         struct if_msghdr *ifm;
 548
 549                         ifm = (struct if_msghdr *)buf;
 550                         if (ifm->ifm_version == RTM_VERSION &&
 551                             ifm->ifm_type == RTM_IFINFO &&
 552                             (ifm->ifm_flags & IFF_UP) &&
 553                             ifm->ifm_data.ifi_link_state != LINK_STATE_DOWN)
 554                                 break;
 555                 }
 556         }
 557
 558         close(s);
 559
 560         return (tv.tv_sec);
 561 }
 562
 563 static int
 564 getnfsargs(char *spec, struct iovec **iov, int *iovlen)
 565 {
 566         struct addrinfo hints, *ai_nfs, *ai;
 567         enum tryret ret;
 568         int ecode, speclen, remoteerr, offset, have_bracket = 0;
 569         char *hostp, *delimp, *errstr;
 570         size_t len;
 571         static char nam[MNAMELEN + 1], pname[MAXHOSTNAMELEN + 5];
 572
 573         if (*spec == '[' && (delimp = strchr(spec + 1, ']')) != NULL &&
 574             *(delimp + 1) == ':') {
 575                 hostp = spec + 1;
 576                 spec = delimp + 2;
 577                 have_bracket = 1;
 578         } else if ((delimp = strrchr(spec, ':')) != NULL) {
 579                 hostp = spec;
 580                 spec = delimp + 1;
 581         } else if ((delimp = strrchr(spec, '@')) != NULL) {
 582                 warnx("path@server syntax is deprecated, use server:path");
 583                 hostp = delimp + 1;
 584         } else {
 585                 warnx("no <host>:<dirpath> nfs-name");
 586                 return (0);
 587         }
 588         *delimp = '\0';
 589
 590         /*
 591          * If there has been a trailing slash at mounttime it seems
 592          * that some mountd implementations fail to remove the mount
 593          * entries from their mountlist while unmounting.
 594          */
 595         for (speclen = strlen(spec);
 596                 speclen > 1 && spec[speclen - 1] == '/';
 597                 speclen--)
 598                 spec[speclen - 1] = '\0';
 599         if (strlen(hostp) + strlen(spec) + 1 > MNAMELEN) {
 600                 warnx("%s:%s: %s", hostp, spec, strerror(ENAMETOOLONG));
 601                 return (0);
 602         }
 603         /* Make both '@' and ':' notations equal */
 604         if (*hostp != '\0') {
 605                 len = strlen(hostp);
 606                 offset = 0;
 607                 if (have_bracket)
 608                         nam[offset++] = '[';
 609                 memmove(nam + offset, hostp, len);
 610                 if (have_bracket)
 611                         nam[len + offset++] = ']';
 612                 nam[len + offset++] = ':';
 613                 memmove(nam + len + offset, spec, speclen);
 614                 nam[len + speclen + offset] = '\0';
 615         }
 616
 617         /*
 618          * Handle an internet host address.
 619          */
 620         memset(&hints, 0, sizeof hints);
 621         hints.ai_flags = AI_NUMERICHOST;
 622         if (nfsproto == IPPROTO_TCP)
 623                 hints.ai_socktype = SOCK_STREAM;
 624         else if (nfsproto == IPPROTO_UDP)
 625                 hints.ai_socktype = SOCK_DGRAM;
 626
 627         if (getaddrinfo(hostp, portspec, &hints, &ai_nfs) != 0) {
 628                 hints.ai_flags = AI_CANONNAME;
 629                 if ((ecode = getaddrinfo(hostp, portspec, &hints, &ai_nfs))
 630                     != 0) {
 631                         if (portspec == NULL)
 632                                 errx(1, "%s: %s", hostp, gai_strerror(ecode));
 633                         else
 634                                 errx(1, "%s:%s: %s", hostp, portspec,
 635                                     gai_strerror(ecode));
 636                         return (0);
 637                 }
 638
 639                 /*
 640                  * For a Kerberized nfs mount where the "principal"
 641                  * argument has not been set, add it here.
 642                  */
 643                 if (got_principal == 0 && secflavor != AUTH_SYS &&
 644                     ai_nfs->ai_canonname != NULL) {
 645                         snprintf(pname, sizeof (pname), "nfs@%s",
 646                             ai_nfs->ai_canonname);
 647                         build_iovec(iov, iovlen, "principal", pname,
 648                             strlen(pname) + 1);
 649                 }
 650         }
 651
 652         ret = TRYRET_LOCALERR;
 653         for (;;) {
 654                 /*
 655                  * Try each entry returned by getaddrinfo(). Note the
 656                  * occurrence of remote errors by setting `remoteerr'.
 657                  */
 658                 remoteerr = 0;
 659                 for (ai = ai_nfs; ai != NULL; ai = ai->ai_next) {
 660                         if ((ai->ai_family == AF_INET6) &&
 661                             (opflags & OF_NOINET6))
 662                                 continue;
 663                         if ((ai->ai_family == AF_INET) &&
 664                             (opflags & OF_NOINET4))
 665                                 continue;
 666                         ret = nfs_tryproto(ai, hostp, spec, &errstr, iov,
 667                             iovlen);
 668                         if (ret == TRYRET_SUCCESS)
 669                                 break;
 670                         if (ret != TRYRET_LOCALERR)
 671                                 remoteerr = 1;
 672                         if ((opflags & ISBGRND) == 0)
 673                                 fprintf(stderr, "%s\n", errstr);
 674                 }
 675                 if (ret == TRYRET_SUCCESS)
 676                         break;
 677
 678                 /* Exit if all errors were local. */
 679                 if (!remoteerr)
 680                         exit(1);
 681
 682                 /*
 683                  * If retrycnt == 0, we are to keep retrying forever.
 684                  * Otherwise decrement it, and exit if it hits zero.
 685                  */
 686                 if (retrycnt != 0 && --retrycnt == 0)
 687                         exit(1);
 688
 689                 if ((opflags & (BGRND | ISBGRND)) == BGRND) {
 690                         warnx("Cannot immediately mount %s:%s, backgrounding",
 691                             hostp, spec);
 692                         opflags |= ISBGRND;
 693                         if (daemon(0, 0) != 0)
 694                                 err(1, "daemon");
 695                 }
 696                 /*
 697                  * If rtm_ifinfo_sleep() returns non-zero, don't count
 698                  * that as a retry attempt.
 699                  */
 700                 if (rtm_ifinfo_sleep(60) && retrycnt != 0)
 701                         retrycnt++;
 702         }
 703         freeaddrinfo(ai_nfs);
 704
 705         build_iovec(iov, iovlen, "hostname", nam, (size_t)-1);
 706         /* Add mounted file system to PATH_MOUNTTAB */
 707         if (mountmode != V4 && !add_mtab(hostp, spec))
 708                 warnx("can't update %s for %s:%s", PATH_MOUNTTAB, hostp, spec);
 709         return (1);
 710 }
 711
 712 /*
 713  * Try to set up the NFS arguments according to the address
 714  * family, protocol (and possibly port) specified in `ai'.
 715  *
 716  * Returns TRYRET_SUCCESS if successful, or:
 717  *   TRYRET_TIMEOUT             The server did not respond.
 718  *   TRYRET_REMOTEERR           The server reported an error.
 719  *   TRYRET_LOCALERR            Local failure.
 720  *
 721  * In all error cases, *errstr will be set to a statically-allocated string
 722  * describing the error.
 723  */
 724 static enum tryret
 725 nfs_tryproto(struct addrinfo *ai, char *hostp, char *spec, char **errstr,
 726     struct iovec **iov, int *iovlen)
 727 {
 728         static char errbuf[256];
 729         struct sockaddr_storage nfs_ss;
 730         struct netbuf nfs_nb;
 731         struct nfhret nfhret;
 732         struct timeval try;
 733         struct rpc_err rpcerr;
 734         CLIENT *clp;
 735         struct netconfig *nconf, *nconf_mnt;
 736         const char *netid, *netid_mnt, *secname;
 737         int doconnect, nfsvers, mntvers, sotype;
 738         enum clnt_stat clntstat;
 739         enum mountmode trymntmode;
 740
 741         sotype = 0;
 742         trymntmode = mountmode;
 743         errbuf[0] = '\0';
 744         *errstr = errbuf;
 745
 746         if (nfsproto == IPPROTO_TCP)
 747                 sotype = SOCK_STREAM;
 748         else if (nfsproto == IPPROTO_UDP)
 749                 sotype = SOCK_DGRAM;
 750
 751         if ((netid = netidbytype(ai->ai_family, sotype)) == NULL) {
 752                 snprintf(errbuf, sizeof errbuf,
 753                     "af %d sotype %d not supported", ai->ai_family, sotype);
 754                 return (TRYRET_LOCALERR);
 755         }
 756         if ((nconf = getnetconf_cached(netid)) == NULL) {
 757                 snprintf(errbuf, sizeof errbuf, "%s: %s", netid, nc_sperror());
 758                 return (TRYRET_LOCALERR);
 759         }
 760         /* The RPCPROG_MNT netid may be different. */
 761         if (mnttcp_ok) {
 762                 netid_mnt = netid;
 763                 nconf_mnt = nconf;
 764         } else {
 765                 if ((netid_mnt = netidbytype(ai->ai_family, SOCK_DGRAM))
 766                      == NULL) {
 767                         snprintf(errbuf, sizeof errbuf,
 768                             "af %d sotype SOCK_DGRAM not supported",
 769                              ai->ai_family);
 770                         return (TRYRET_LOCALERR);
 771                 }
 772                 if ((nconf_mnt = getnetconf_cached(netid_mnt)) == NULL) {
 773                         snprintf(errbuf, sizeof errbuf, "%s: %s", netid_mnt,
 774                             nc_sperror());
 775                         return (TRYRET_LOCALERR);
 776                 }
 777         }
 778
 779 tryagain:
 780         if (trymntmode == V4) {
 781                 nfsvers = 4;
 782                 mntvers = 3; /* Workaround for GCC. */
 783         } else if (trymntmode == V2) {
 784                 nfsvers = 2;
 785                 mntvers = 1;
 786         } else {
 787                 nfsvers = 3;
 788                 mntvers = 3;
 789         }
 790
 791         if (portspec != NULL) {
 792                 /* `ai' contains the complete nfsd sockaddr. */
 793                 nfs_nb.buf = ai->ai_addr;
 794                 nfs_nb.len = nfs_nb.maxlen = ai->ai_addrlen;
 795         } else {
 796                 /* Ask the remote rpcbind. */
 797                 nfs_nb.buf = &nfs_ss;
 798                 nfs_nb.len = nfs_nb.maxlen = sizeof nfs_ss;
 799
 800                 if (!rpcb_getaddr(NFS_PROGRAM, nfsvers, nconf, &nfs_nb,
 801                     hostp)) {
 802                         if (rpc_createerr.cf_stat == RPC_PROGVERSMISMATCH &&
 803                             trymntmode == ANY) {
 804                                 trymntmode = V2;
 805                                 goto tryagain;
 806                         }
 807                         snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s",
 808                             netid, hostp, spec,
 809                             clnt_spcreateerror("RPCPROG_NFS"));
 810                         return (returncode(rpc_createerr.cf_stat,
 811                             &rpc_createerr.cf_error));
 812                 }
 813         }
 814
 815         /* Check that the server (nfsd) responds on the port we have chosen. */
 816         clp = clnt_tli_create(RPC_ANYFD, nconf, &nfs_nb, NFS_PROGRAM, nfsvers,
 817             0, 0);
 818         if (clp == NULL) {
 819                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
 820                     hostp, spec, clnt_spcreateerror("nfsd: RPCPROG_NFS"));
 821                 return (returncode(rpc_createerr.cf_stat,
 822                     &rpc_createerr.cf_error));
 823         }
 824         if (sotype == SOCK_DGRAM && noconn == 0) {
 825                 /*
 826                  * Use connect(), to match what the kernel does. This
 827                  * catches cases where the server responds from the
 828                  * wrong source address.
 829                  */
 830                 doconnect = 1;
 831                 if (!clnt_control(clp, CLSET_CONNECT, (char *)&doconnect)) {
 832                         clnt_destroy(clp);
 833                         snprintf(errbuf, sizeof errbuf,
 834                             "[%s] %s:%s: CLSET_CONNECT failed", netid, hostp,
 835                             spec);
 836                         return (TRYRET_LOCALERR);
 837                 }
 838         }
 839
 840         try.tv_sec = 10;
 841         try.tv_usec = 0;
 842         clntstat = clnt_call(clp, NFSPROC_NULL, (xdrproc_t)xdr_void, NULL,
 843                          (xdrproc_t)xdr_void, NULL, try);
 844         if (clntstat != RPC_SUCCESS) {
 845                 if (clntstat == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
 846                         clnt_destroy(clp);
 847                         trymntmode = V2;
 848                         goto tryagain;
 849                 }
 850                 clnt_geterr(clp, &rpcerr);
 851                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
 852                     hostp, spec, clnt_sperror(clp, "NFSPROC_NULL"));
 853                 clnt_destroy(clp);
 854                 return (returncode(clntstat, &rpcerr));
 855         }
 856         clnt_destroy(clp);
 857
 858         /*
 859          * For NFSv4, there is no mount protocol.
 860          */
 861         if (trymntmode == V4) {
 862                 /*
 863                  * Store the server address in nfsargsp, making
 864                  * sure to copy any locally allocated structures.
 865                  */
 866                 addrlen = nfs_nb.len;
 867                 addr = malloc(addrlen);
 868                 if (addr == NULL)
 869                         err(1, "malloc");
 870                 bcopy(nfs_nb.buf, addr, addrlen);
 871
 872                 build_iovec(iov, iovlen, "addr", addr, addrlen);
 873                 secname = sec_num_to_name(secflavor);
 874                 if (secname != NULL) {
 875                         build_iovec(iov, iovlen, "sec",
 876                             __DECONST(void *, secname), (size_t)-1);
 877                 }
 878                 build_iovec(iov, iovlen, "nfsv4", NULL, 0);
 879                 build_iovec(iov, iovlen, "dirpath", spec, (size_t)-1);
 880
 881                 return (TRYRET_SUCCESS);
 882         }
 883
 884         /* Send the MOUNTPROC_MNT RPC to get the root filehandle. */
 885         try.tv_sec = 10;
 886         try.tv_usec = 0;
 887         clp = clnt_tp_create(hostp, MOUNTPROG, mntvers, nconf_mnt);
 888         if (clp == NULL) {
 889                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
 890                     hostp, spec, clnt_spcreateerror("RPCMNT: clnt_create"));
 891                 return (returncode(rpc_createerr.cf_stat,
 892                     &rpc_createerr.cf_error));
 893         }
 894         clp->cl_auth = authsys_create_default();
 895         nfhret.auth = secflavor;
 896         nfhret.vers = mntvers;
 897         clntstat = clnt_call(clp, MOUNTPROC_MNT, (xdrproc_t)xdr_dir, spec,
 898                          (xdrproc_t)xdr_fh, &nfhret,
 899             try);
 900         auth_destroy(clp->cl_auth);
 901         if (clntstat != RPC_SUCCESS) {
 902                 if (clntstat == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
 903                         clnt_destroy(clp);
 904                         trymntmode = V2;
 905                         goto tryagain;
 906                 }
 907                 clnt_geterr(clp, &rpcerr);
 908                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
 909                     hostp, spec, clnt_sperror(clp, "RPCPROG_MNT"));
 910                 clnt_destroy(clp);
 911                 return (returncode(clntstat, &rpcerr));
 912         }
 913         clnt_destroy(clp);
 914
 915         if (nfhret.stat != 0) {
 916                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
 917                     hostp, spec, strerror(nfhret.stat));
 918                 return (TRYRET_REMOTEERR);
 919         }
 920
 921         /*
 922          * Store the filehandle and server address in nfsargsp, making
 923          * sure to copy any locally allocated structures.
 924          */
 925         addrlen = nfs_nb.len;
 926         addr = malloc(addrlen);
 927         fhsize = nfhret.fhsize;
 928         fh = malloc(fhsize);
 929         if (addr == NULL || fh == NULL)
 930                 err(1, "malloc");
 931         bcopy(nfs_nb.buf, addr, addrlen);
 932         bcopy(nfhret.nfh, fh, fhsize);
 933
 934         build_iovec(iov, iovlen, "addr", addr, addrlen);
 935         build_iovec(iov, iovlen, "fh", fh, fhsize);
 936         secname = sec_num_to_name(nfhret.auth);
 937         if (secname) {
 938                 build_iovec(iov, iovlen, "sec",
 939                     __DECONST(void *, secname), (size_t)-1);
 940         }
 941         if (nfsvers == 3)
 942                 build_iovec(iov, iovlen, "nfsv3", NULL, 0);
 943
 944         return (TRYRET_SUCCESS);
 945 }
 946
 947 /*
 948  * Catagorise a RPC return status and error into an `enum tryret'
 949  * return code.
 950  */
 951 static enum tryret
 952 returncode(enum clnt_stat clntstat, struct rpc_err *rpcerr)
 953 {
 954
 955         switch (clntstat) {
 956         case RPC_TIMEDOUT:
 957                 return (TRYRET_TIMEOUT);
 958         case RPC_PMAPFAILURE:
 959         case RPC_PROGNOTREGISTERED:
 960         case RPC_PROGVERSMISMATCH:
 961         /* XXX, these can be local or remote. */
 962         case RPC_CANTSEND:
 963         case RPC_CANTRECV:
 964                 return (TRYRET_REMOTEERR);
 965         case RPC_SYSTEMERROR:
 966                 switch (rpcerr->re_errno) {
 967                 case ETIMEDOUT:
 968                         return (TRYRET_TIMEOUT);
 969                 case ENOMEM:
 970                         break;
 971                 default:
 972                         return (TRYRET_REMOTEERR);
 973                 }
 974                 /* FALLTHROUGH */
 975         default:
 976                 break;
 977         }
 978         return (TRYRET_LOCALERR);
 979 }
 980
 981 /*
 982  * Look up a netid based on an address family and socket type.
 983  * `af' is the address family, and `sotype' is SOCK_DGRAM or SOCK_STREAM.
 984  *
 985  * XXX there should be a library function for this.
 986  */
 987 static const char *
 988 netidbytype(int af, int sotype)
 989 {
 990         struct nc_protos *p;
 991
 992         for (p = nc_protos; p->netid != NULL; p++) {
 993                 if (af != p->af || sotype != p->sotype)
 994                         continue;
 995                 return (p->netid);
 996         }
 997         return (NULL);
 998 }
 999
1000 /*
1001  * Look up a netconfig entry based on a netid, and cache the result so
1002  * that we don't need to remember to call freenetconfigent().
1003  *
1004  * Otherwise it behaves just like getnetconfigent(), so nc_*error()
1005  * work on failure.
1006  */
1007 static struct netconfig *
1008 getnetconf_cached(const char *netid)
1009 {
1010         static struct nc_entry {
1011                 struct netconfig *nconf;
1012                 struct nc_entry *next;
1013         } *head;
1014         struct nc_entry *p;
1015         struct netconfig *nconf;
1016
1017         for (p = head; p != NULL; p = p->next)
1018                 if (strcmp(netid, p->nconf->nc_netid) == 0)
1019                         return (p->nconf);
1020
1021         if ((nconf = getnetconfigent(netid)) == NULL)
1022                 return (NULL);
1023         if ((p = malloc(sizeof(*p))) == NULL)
1024                 err(1, "malloc");
1025         p->nconf = nconf;
1026         p->next = head;
1027         head = p;
1028
1029         return (p->nconf);
1030 }
1031
1032 /*
1033  * xdr routines for mount rpc's
1034  */
1035 static int
1036 xdr_dir(XDR *xdrsp, char *dirp)
1037 {
1038         return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
1039 }
1040
1041 static int
1042 xdr_fh(XDR *xdrsp, struct nfhret *np)
1043 {
1044         int i;
1045         long auth, authcnt, authfnd = 0;
1046
1047         if (!xdr_u_long(xdrsp, &np->stat))
1048                 return (0);
1049         if (np->stat)
1050                 return (1);
1051         switch (np->vers) {
1052         case 1:
1053                 np->fhsize = NFS_FHSIZE;
1054                 return (xdr_opaque(xdrsp, (caddr_t)np->nfh, NFS_FHSIZE));
1055         case 3:
1056                 if (!xdr_long(xdrsp, &np->fhsize))
1057                         return (0);
1058                 if (np->fhsize <= 0 || np->fhsize > NFS3_FHSIZE)
1059                         return (0);
1060                 if (!xdr_opaque(xdrsp, (caddr_t)np->nfh, np->fhsize))
1061                         return (0);
1062                 if (!xdr_long(xdrsp, &authcnt))
1063                         return (0);
1064                 for (i = 0; i < authcnt; i++) {
1065                         if (!xdr_long(xdrsp, &auth))
1066                                 return (0);
1067                         if (np->auth == -1) {
1068                                 np->auth = auth;
1069                                 authfnd++;
1070                         } else if (auth == np->auth) {
1071                                 authfnd++;
1072                         }
1073                 }
1074                 /*
1075                  * Some servers, such as DEC's OSF/1 return a nil authenticator
1076                  * list to indicate RPCAUTH_UNIX.
1077                  */
1078                 if (authcnt == 0 && np->auth == -1)
1079                         np->auth = AUTH_SYS;
1080                 if (!authfnd && (authcnt > 0 || np->auth != AUTH_SYS))
1081                         np->stat = EAUTH;
1082                 return (1);
1083         }
1084         return (0);
1085 }
1086
1087 static void
1088 usage(void)
1089 {
1090         (void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
1091 "usage: mount_nfs [-23bcdiLlNPsTU] [-a maxreadahead] [-D deadthresh]",
1092 "                 [-g maxgroups] [-I readdirsize] [-o options] [-R retrycnt]",
1093 "                 [-r readsize] [-t timeout] [-w writesize] [-x retrans]",
1094 "                 rhost:path node");
1095         exit(1);
1096 }