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           0x01
 107 #define ISBGRND         0x02
 108 #define OF_NOINET4      0x04
 109 #define OF_NOINET6      0x08
 110 #define BGRNDNOW        0x10
 111 static int retrycnt = -1;
 112 static int opflags = 0;
 113 static int nfsproto = IPPROTO_TCP;
 114 static int mnttcp_ok = 1;
 115 static int noconn = 0;
 116 /* The 'portspec' is the server nfs port; NULL means look up via rpcbind. */
 117 static const char *portspec = NULL;
 118 static struct sockaddr *addr;
 119 static int addrlen = 0;
 120 static u_char *fh = NULL;
 121 static int fhsize = 0;
 122 static int secflavor = -1;
 123 static int got_principal = 0;
 124
 125 static enum mountmode {
 126         ANY,
 127         V2,
 128         V3,
 129         V4
 130 } mountmode = ANY;
 131
 132 /* Return codes for nfs_tryproto. */
 133 enum tryret {
 134         TRYRET_SUCCESS,
 135         TRYRET_TIMEOUT,         /* No response received. */
 136         TRYRET_REMOTEERR,       /* Error received from remote server. */
 137         TRYRET_LOCALERR         /* Local failure. */
 138 };
 139
 140 static int      sec_name_to_num(const char *sec);
 141 static const char       *sec_num_to_name(int num);
 142 static int      getnfsargs(char *, struct iovec **iov, int *iovlen);
 143 /* void set_rpc_maxgrouplist(int); */
 144 static struct netconfig *getnetconf_cached(const char *netid);
 145 static const char       *netidbytype(int af, int sotype);
 146 static void     usage(void) __dead2;
 147 static int      xdr_dir(XDR *, char *);
 148 static int      xdr_fh(XDR *, struct nfhret *);
 149 static enum tryret nfs_tryproto(struct addrinfo *ai, char *hostp, char *spec,
 150     char **errstr, struct iovec **iov, int *iovlen);
 151 static enum tryret returncode(enum clnt_stat stat, struct rpc_err *rpcerr);
 152
 153 int
 154 main(int argc, char *argv[])
 155 {
 156         int c;
 157         struct iovec *iov;
 158         int num, iovlen;
 159         char *mntname, *p, *spec, *tmp;
 160         char mntpath[MAXPATHLEN], errmsg[255];
 161         char hostname[MAXHOSTNAMELEN + 1], gssn[MAXHOSTNAMELEN + 50];
 162         const char *gssname, *nmount_errstr;
 163
 164         iov = NULL;
 165         iovlen = 0;
 166         memset(errmsg, 0, sizeof(errmsg));
 167         gssname = NULL;
 168
 169         while ((c = getopt(argc, argv,
 170             "23a:bcdD:g:I:iLlNo:PR:r:sTt:w:x:U")) != -1)
 171                 switch (c) {
 172                 case '2':
 173                         mountmode = V2;
 174                         break;
 175                 case '3':
 176                         mountmode = V3;
 177                         break;
 178                 case 'a':
 179                         printf("-a deprecated, use -o readahead=<value>\n");
 180                         build_iovec(&iov, &iovlen, "readahead", optarg, (size_t)-1);
 181                         break;
 182                 case 'b':
 183                         opflags |= BGRND;
 184                         break;
 185                 case 'c':
 186                         printf("-c deprecated, use -o noconn\n");
 187                         build_iovec(&iov, &iovlen, "noconn", NULL, 0);
 188                         noconn = 1;
 189                         break;
 190                 case 'D':
 191                         printf("-D deprecated, use -o deadthresh=<value>\n");
 192                         build_iovec(&iov, &iovlen, "deadthresh", optarg, (size_t)-1);
 193                         break;
 194                 case 'd':
 195                         printf("-d deprecated, use -o dumbtimer");
 196                         build_iovec(&iov, &iovlen, "dumbtimer", NULL, 0);
 197                         break;
 198                 case 'g':
 199                         printf("-g deprecated, use -o maxgroups");
 200                         num = strtol(optarg, &p, 10);
 201                         if (*p || num <= 0)
 202                                 errx(1, "illegal -g value -- %s", optarg);
 203                         //set_rpc_maxgrouplist(num);
 204                         build_iovec(&iov, &iovlen, "maxgroups", optarg, (size_t)-1);
 205                         break;
 206                 case 'I':
 207                         printf("-I deprecated, use -o readdirsize=<value>\n");
 208                         build_iovec(&iov, &iovlen, "readdirsize", optarg, (size_t)-1);
 209                         break;
 210                 case 'i':
 211                         printf("-i deprecated, use -o intr\n");
 212                         build_iovec(&iov, &iovlen, "intr", NULL, 0);
 213                         break;
 214                 case 'L':
 215                         printf("-L deprecated, use -o nolockd\n");
 216                         build_iovec(&iov, &iovlen, "nolockd", NULL, 0);
 217                         break;
 218                 case 'l':
 219                         printf("-l deprecated, -o rdirplus\n");
 220                         build_iovec(&iov, &iovlen, "rdirplus", NULL, 0);
 221                         break;
 222                 case 'N':
 223                         printf("-N deprecated, do not specify -o resvport\n");
 224                         break;
 225                 case 'o': {
 226                         int pass_flag_to_nmount;
 227                         char *opt = optarg;
 228                         while (opt) {
 229                                 char *pval = NULL;
 230                                 char *pnextopt = NULL;
 231                                 const char *val = "";
 232                                 pass_flag_to_nmount = 1;
 233                                 pnextopt = strchr(opt, ',');
 234                                 if (pnextopt != NULL) {
 235                                         *pnextopt = '\0';
 236                                         pnextopt++;
 237                                 }
 238                                 pval = strchr(opt, '=');
 239                                 if (pval != NULL) {
 240                                         *pval = '\0';
 241                                         val = pval + 1;
 242                                 }
 243                                 if (strcmp(opt, "bg") == 0) {
 244                                         opflags |= BGRND;
 245                                         pass_flag_to_nmount=0;
 246                                 } else if (strcmp(opt, "bgnow") == 0) {
 247                                         opflags |= BGRNDNOW;
 248                                         pass_flag_to_nmount=0;
 249                                 } else if (strcmp(opt, "fg") == 0) {
 250                                         /* same as not specifying -o bg */
 251                                         pass_flag_to_nmount=0;
 252                                 } else if (strcmp(opt, "gssname") == 0) {
 253                                         pass_flag_to_nmount = 0;
 254                                         gssname = val;
 255                                 } else if (strcmp(opt, "mntudp") == 0) {
 256                                         mnttcp_ok = 0;
 257                                         nfsproto = IPPROTO_UDP;
 258                                 } else if (strcmp(opt, "udp") == 0) {
 259                                         nfsproto = IPPROTO_UDP;
 260                                 } else if (strcmp(opt, "tcp") == 0) {
 261                                         nfsproto = IPPROTO_TCP;
 262                                 } else if (strcmp(opt, "noinet4") == 0) {
 263                                         pass_flag_to_nmount=0;
 264                                         opflags |= OF_NOINET4;
 265                                 } else if (strcmp(opt, "noinet6") == 0) {
 266                                         pass_flag_to_nmount=0;
 267                                         opflags |= OF_NOINET6;
 268                                 } else if (strcmp(opt, "noconn") == 0) {
 269                                         noconn = 1;
 270                                 } else if (strcmp(opt, "nfsv2") == 0) {
 271                                         pass_flag_to_nmount=0;
 272                                         mountmode = V2;
 273                                 } else if (strcmp(opt, "nfsv3") == 0) {
 274                                         mountmode = V3;
 275                                 } else if (strcmp(opt, "nfsv4") == 0) {
 276                                         pass_flag_to_nmount=0;
 277                                         mountmode = V4;
 278                                         nfsproto = IPPROTO_TCP;
 279                                         if (portspec == NULL)
 280                                                 portspec = "2049";
 281                                 } else if (strcmp(opt, "port") == 0) {
 282                                         pass_flag_to_nmount=0;
 283                                         asprintf(&tmp, "%d", atoi(val));
 284                                         if (tmp == NULL)
 285                                                 err(1, "asprintf");
 286                                         portspec = tmp;
 287                                 } else if (strcmp(opt, "principal") == 0) {
 288                                         got_principal = 1;
 289                                 } else if (strcmp(opt, "proto") == 0) {
 290                                         pass_flag_to_nmount=0;
 291                                         if (strcmp(val, "tcp") == 0) {
 292                                                 nfsproto = IPPROTO_TCP;
 293                                                 opflags |= OF_NOINET6;
 294                                                 build_iovec(&iov, &iovlen,
 295                                                     "tcp", NULL, 0);
 296                                         } else if (strcmp(val, "udp") == 0) {
 297                                                 mnttcp_ok = 0;
 298                                                 nfsproto = IPPROTO_UDP;
 299                                                 opflags |= OF_NOINET6;
 300                                                 build_iovec(&iov, &iovlen,
 301                                                     "udp", NULL, 0);
 302                                         } else if (strcmp(val, "tcp6") == 0) {
 303                                                 nfsproto = IPPROTO_TCP;
 304                                                 opflags |= OF_NOINET4;
 305                                                 build_iovec(&iov, &iovlen,
 306                                                     "tcp", NULL, 0);
 307                                         } else if (strcmp(val, "udp6") == 0) {
 308                                                 mnttcp_ok = 0;
 309                                                 nfsproto = IPPROTO_UDP;
 310                                                 opflags |= OF_NOINET4;
 311                                                 build_iovec(&iov, &iovlen,
 312                                                     "udp", NULL, 0);
 313                                         } else {
 314                                                 errx(1,
 315                                                     "illegal proto value -- %s",
 316                                                     val);
 317                                         }
 318                                 } else if (strcmp(opt, "sec") == 0) {
 319                                         /*
 320                                          * Don't add this option to
 321                                          * the iovec yet - we will
 322                                          * negotiate which sec flavor
 323                                          * to use with the remote
 324                                          * mountd.
 325                                          */
 326                                         pass_flag_to_nmount=0;
 327                                         secflavor = sec_name_to_num(val);
 328                                         if (secflavor < 0) {
 329                                                 errx(1,
 330                                                     "illegal sec value -- %s",
 331                                                     val);
 332                                         }
 333                                 } else if (strcmp(opt, "retrycnt") == 0) {
 334                                         pass_flag_to_nmount=0;
 335                                         num = strtol(val, &p, 10);
 336                                         if (*p || num < 0)
 337                                                 errx(1, "illegal retrycnt value -- %s", val);
 338                                         retrycnt = num;
 339                                 } else if (strcmp(opt, "maxgroups") == 0) {
 340                                         num = strtol(val, &p, 10);
 341                                         if (*p || num <= 0)
 342                                                 errx(1, "illegal maxgroups value -- %s", val);
 343                                         //set_rpc_maxgrouplist(num);
 344                                 } else if (strcmp(opt, "vers") == 0) {
 345                                         num = strtol(val, &p, 10);
 346                                         if (*p || num <= 0)
 347                                                 errx(1, "illegal vers value -- "
 348                                                     "%s", val);
 349                                         switch (num) {
 350                                         case 2:
 351                                                 mountmode = V2;
 352                                                 break;
 353                                         case 3:
 354                                                 mountmode = V3;
 355                                                 build_iovec(&iov, &iovlen,
 356                                                     "nfsv3", NULL, 0);
 357                                                 break;
 358                                         case 4:
 359                                                 mountmode = V4;
 360                                                 nfsproto = IPPROTO_TCP;
 361                                                 if (portspec == NULL)
 362                                                         portspec = "2049";
 363                                                 break;
 364                                         default:
 365                                                 errx(1, "illegal nfs version "
 366                                                     "value -- %s", val);
 367                                         }
 368                                         pass_flag_to_nmount=0;
 369                                 }
 370                                 if (pass_flag_to_nmount) {
 371                                         build_iovec(&iov, &iovlen, opt,
 372                                             __DECONST(void *, val),
 373                                             strlen(val) + 1);
 374                                 }
 375                                 opt = pnextopt;
 376                         }
 377                         }
 378                         break;
 379                 case 'P':
 380                         /* obsolete for -o noresvport now default */
 381                         printf("-P deprecated, use -o noresvport\n");
 382                         build_iovec(&iov, &iovlen, "noresvport", NULL, 0);
 383                         break;
 384                 case 'R':
 385                         printf("-R deprecated, use -o retrycnt=<retrycnt>\n");
 386                         num = strtol(optarg, &p, 10);
 387                         if (*p || num < 0)
 388                                 errx(1, "illegal -R value -- %s", optarg);
 389                         retrycnt = num;
 390                         break;
 391                 case 'r':
 392                         printf("-r deprecated, use -o rsize=<rsize>\n");
 393                         build_iovec(&iov, &iovlen, "rsize", optarg, (size_t)-1);
 394                         break;
 395                 case 's':
 396                         printf("-s deprecated, use -o soft\n");
 397                         build_iovec(&iov, &iovlen, "soft", NULL, 0);
 398                         break;
 399                 case 'T':
 400                         nfsproto = IPPROTO_TCP;
 401                         printf("-T deprecated, use -o tcp\n");
 402                         break;
 403                 case 't':
 404                         printf("-t deprecated, use -o timeout=<value>\n");
 405                         build_iovec(&iov, &iovlen, "timeout", optarg, (size_t)-1);
 406                         break;
 407                 case 'w':
 408                         printf("-w deprecated, use -o wsize=<value>\n");
 409                         build_iovec(&iov, &iovlen, "wsize", optarg, (size_t)-1);
 410                         break;
 411                 case 'x':
 412                         printf("-x deprecated, use -o retrans=<value>\n");
 413                         build_iovec(&iov, &iovlen, "retrans", optarg, (size_t)-1);
 414                         break;
 415                 case 'U':
 416                         printf("-U deprecated, use -o mntudp\n");
 417                         mnttcp_ok = 0;
 418                         nfsproto = IPPROTO_UDP;
 419                         build_iovec(&iov, &iovlen, "mntudp", NULL, 0);
 420                         break;
 421                 default:
 422                         usage();
 423                         break;
 424                 }
 425         argc -= optind;
 426         argv += optind;
 427
 428         if ((opflags & (BGRND | BGRNDNOW)) == (BGRND | BGRNDNOW))
 429                 errx(1, "Options bg and bgnow are mutually exclusive");
 430
 431         if (argc != 2) {
 432                 usage();
 433                 /* NOTREACHED */
 434         }
 435
 436         spec = *argv++;
 437         mntname = *argv;
 438
 439         if (retrycnt == -1)
 440                 /* The default is to keep retrying forever. */
 441                 retrycnt = 0;
 442
 443         if (modfind("nfscl") < 0) {
 444                 /* Not present in kernel, try loading it */
 445                 if (kldload("nfscl") < 0 ||
 446                     modfind("nfscl") < 0)
 447                         errx(1, "nfscl is not available");
 448         }
 449
 450         /*
 451          * Add the fqdn to the gssname, as required.
 452          */
 453         if (gssname != NULL) {
 454                 if (strchr(gssname, '@') == NULL &&
 455                     gethostname(hostname, MAXHOSTNAMELEN) == 0) {
 456                         snprintf(gssn, sizeof (gssn), "%s@%s", gssname,
 457                             hostname);
 458                         gssname = gssn;
 459                 }
 460                 build_iovec(&iov, &iovlen, "gssname",
 461                     __DECONST(void *, gssname), strlen(gssname) + 1);
 462         }
 463
 464         if (!getnfsargs(spec, &iov, &iovlen))
 465                 exit(1);
 466
 467         /* resolve the mountpoint with realpath(3) */
 468         if (checkpath(mntname, mntpath) != 0)
 469                 err(1, "%s", mntpath);
 470
 471         build_iovec_argf(&iov, &iovlen, "fstype", "nfs");
 472         build_iovec(&iov, &iovlen, "fspath", mntpath, (size_t)-1);
 473         build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
 474
 475         if (nmount(iov, iovlen, 0)) {
 476                 nmount_errstr = nfsv4_geterrstr(errno);
 477                 if (mountmode == V4 && nmount_errstr != NULL)
 478                         errx(1, "nmount: %s, %s", mntpath, nmount_errstr);
 479                 else
 480                         err(1, "nmount: %s%s%s", mntpath, errmsg[0] ? ", " : "",
 481                             errmsg);
 482         }
 483
 484         exit(0);
 485 }
 486
 487 static int
 488 sec_name_to_num(const char *sec)
 489 {
 490         if (!strcmp(sec, "krb5"))
 491                 return (RPCSEC_GSS_KRB5);
 492         if (!strcmp(sec, "krb5i"))
 493                 return (RPCSEC_GSS_KRB5I);
 494         if (!strcmp(sec, "krb5p"))
 495                 return (RPCSEC_GSS_KRB5P);
 496         if (!strcmp(sec, "sys"))
 497                 return (AUTH_SYS);
 498         return (-1);
 499 }
 500
 501 static const char *
 502 sec_num_to_name(int flavor)
 503 {
 504         switch (flavor) {
 505         case RPCSEC_GSS_KRB5:
 506                 return ("krb5");
 507         case RPCSEC_GSS_KRB5I:
 508                 return ("krb5i");
 509         case RPCSEC_GSS_KRB5P:
 510                 return ("krb5p");
 511         case AUTH_SYS:
 512                 return ("sys");
 513         }
 514         return (NULL);
 515 }
 516
 517 /*
 518  * Wait for RTM_IFINFO message with interface that is IFF_UP and with
 519  * link on, or until timeout expires.  Returns seconds left.
 520  */
 521 static time_t
 522 rtm_ifinfo_sleep(time_t sec)
 523 {
 524         char buf[2048] __aligned(__alignof(struct if_msghdr));
 525         fd_set rfds;
 526         struct timeval tv, start;
 527         ssize_t nread;
 528         int n, s;
 529
 530         s = socket(PF_ROUTE, SOCK_RAW, 0);
 531         if (s < 0)
 532                 err(EX_OSERR, "socket");
 533         (void)gettimeofday(&start, NULL);
 534
 535         for (tv.tv_sec = sec, tv.tv_usec = 0;
 536             tv.tv_sec > 0;
 537             (void)gettimeofday(&tv, NULL),
 538             tv.tv_sec = sec - (tv.tv_sec - start.tv_sec)) {
 539                 FD_ZERO(&rfds);
 540                 FD_SET(s, &rfds);
 541                 n = select(s + 1, &rfds, NULL, NULL, &tv);
 542                 if (n == 0)
 543                         continue;
 544                 if (n == -1) {
 545                         if (errno == EINTR)
 546                                 continue;
 547                         else
 548                                 err(EX_SOFTWARE, "select");
 549                 }
 550                 nread = read(s, buf, 2048);
 551                 if (nread < 0)
 552                         err(EX_OSERR, "read");
 553                 if ((size_t)nread >= sizeof(struct if_msghdr)) {
 554                         struct if_msghdr *ifm;
 555
 556                         ifm = (struct if_msghdr *)buf;
 557                         if (ifm->ifm_version == RTM_VERSION &&
 558                             ifm->ifm_type == RTM_IFINFO &&
 559                             (ifm->ifm_flags & IFF_UP) &&
 560                             ifm->ifm_data.ifi_link_state != LINK_STATE_DOWN)
 561                                 break;
 562                 }
 563         }
 564
 565         close(s);
 566
 567         return (tv.tv_sec);
 568 }
 569
 570 static int
 571 getnfsargs(char *spec, struct iovec **iov, int *iovlen)
 572 {
 573         struct addrinfo hints, *ai_nfs, *ai;
 574         enum tryret ret;
 575         int ecode, speclen, remoteerr, offset, have_bracket = 0;
 576         char *hostp, *delimp, *errstr;
 577         size_t len;
 578         static char nam[MNAMELEN + 1], pname[MAXHOSTNAMELEN + 5];
 579
 580         if (*spec == '[' && (delimp = strchr(spec + 1, ']')) != NULL &&
 581             *(delimp + 1) == ':') {
 582                 hostp = spec + 1;
 583                 spec = delimp + 2;
 584                 have_bracket = 1;
 585         } else if ((delimp = strrchr(spec, ':')) != NULL) {
 586                 hostp = spec;
 587                 spec = delimp + 1;
 588         } else if ((delimp = strrchr(spec, '@')) != NULL) {
 589                 warnx("path@server syntax is deprecated, use server:path");
 590                 hostp = delimp + 1;
 591         } else {
 592                 warnx("no <host>:<dirpath> nfs-name");
 593                 return (0);
 594         }
 595         *delimp = '\0';
 596
 597         /*
 598          * If there has been a trailing slash at mounttime it seems
 599          * that some mountd implementations fail to remove the mount
 600          * entries from their mountlist while unmounting.
 601          */
 602         for (speclen = strlen(spec);
 603                 speclen > 1 && spec[speclen - 1] == '/';
 604                 speclen--)
 605                 spec[speclen - 1] = '\0';
 606         if (strlen(hostp) + strlen(spec) + 1 > MNAMELEN) {
 607                 warnx("%s:%s: %s", hostp, spec, strerror(ENAMETOOLONG));
 608                 return (0);
 609         }
 610         /* Make both '@' and ':' notations equal */
 611         if (*hostp != '\0') {
 612                 len = strlen(hostp);
 613                 offset = 0;
 614                 if (have_bracket)
 615                         nam[offset++] = '[';
 616                 memmove(nam + offset, hostp, len);
 617                 if (have_bracket)
 618                         nam[len + offset++] = ']';
 619                 nam[len + offset++] = ':';
 620                 memmove(nam + len + offset, spec, speclen);
 621                 nam[len + speclen + offset] = '\0';
 622         }
 623
 624         /*
 625          * Handle an internet host address.
 626          */
 627         memset(&hints, 0, sizeof hints);
 628         hints.ai_flags = AI_NUMERICHOST;
 629         if (nfsproto == IPPROTO_TCP)
 630                 hints.ai_socktype = SOCK_STREAM;
 631         else if (nfsproto == IPPROTO_UDP)
 632                 hints.ai_socktype = SOCK_DGRAM;
 633
 634         if (getaddrinfo(hostp, portspec, &hints, &ai_nfs) != 0) {
 635                 hints.ai_flags = AI_CANONNAME;
 636                 if ((ecode = getaddrinfo(hostp, portspec, &hints, &ai_nfs))
 637                     != 0) {
 638                         if (portspec == NULL)
 639                                 errx(1, "%s: %s", hostp, gai_strerror(ecode));
 640                         else
 641                                 errx(1, "%s:%s: %s", hostp, portspec,
 642                                     gai_strerror(ecode));
 643                         return (0);
 644                 }
 645
 646                 /*
 647                  * For a Kerberized nfs mount where the "principal"
 648                  * argument has not been set, add it here.
 649                  */
 650                 if (got_principal == 0 && secflavor != AUTH_SYS &&
 651                     ai_nfs->ai_canonname != NULL) {
 652                         snprintf(pname, sizeof (pname), "nfs@%s",
 653                             ai_nfs->ai_canonname);
 654                         build_iovec(iov, iovlen, "principal", pname,
 655                             strlen(pname) + 1);
 656                 }
 657         }
 658
 659         if ((opflags & (BGRNDNOW | ISBGRND)) == BGRNDNOW) {
 660                 warnx("Mount %s:%s, backgrounding",
 661                     hostp, spec);
 662                 opflags |= ISBGRND;
 663                 if (daemon(0, 0) != 0)
 664                         err(1, "daemon");
 665         }
 666
 667         ret = TRYRET_LOCALERR;
 668         for (;;) {
 669                 /*
 670                  * Try each entry returned by getaddrinfo(). Note the
 671                  * occurrence of remote errors by setting `remoteerr'.
 672                  */
 673                 remoteerr = 0;
 674                 for (ai = ai_nfs; ai != NULL; ai = ai->ai_next) {
 675                         if ((ai->ai_family == AF_INET6) &&
 676                             (opflags & OF_NOINET6))
 677                                 continue;
 678                         if ((ai->ai_family == AF_INET) &&
 679                             (opflags & OF_NOINET4))
 680                                 continue;
 681                         ret = nfs_tryproto(ai, hostp, spec, &errstr, iov,
 682                             iovlen);
 683                         if (ret == TRYRET_SUCCESS)
 684                                 break;
 685                         if (ret != TRYRET_LOCALERR)
 686                                 remoteerr = 1;
 687                         if ((opflags & ISBGRND) == 0)
 688                                 fprintf(stderr, "%s\n", errstr);
 689                 }
 690                 if (ret == TRYRET_SUCCESS)
 691                         break;
 692
 693                 /* Exit if all errors were local. */
 694                 if (!remoteerr)
 695                         exit(1);
 696
 697                 /*
 698                  * If retrycnt == 0, we are to keep retrying forever.
 699                  * Otherwise decrement it, and exit if it hits zero.
 700                  */
 701                 if (retrycnt != 0 && --retrycnt == 0)
 702                         exit(1);
 703
 704                 if ((opflags & (BGRND | ISBGRND)) == BGRND) {
 705                         warnx("Cannot immediately mount %s:%s, backgrounding",
 706                             hostp, spec);
 707                         opflags |= ISBGRND;
 708                         if (daemon(0, 0) != 0)
 709                                 err(1, "daemon");
 710                 }
 711                 /*
 712                  * If rtm_ifinfo_sleep() returns non-zero, don't count
 713                  * that as a retry attempt.
 714                  */
 715                 if (rtm_ifinfo_sleep(60) && retrycnt != 0)
 716                         retrycnt++;
 717         }
 718         freeaddrinfo(ai_nfs);
 719
 720         build_iovec(iov, iovlen, "hostname", nam, (size_t)-1);
 721         /* Add mounted file system to PATH_MOUNTTAB */
 722         if (mountmode != V4 && !add_mtab(hostp, spec))
 723                 warnx("can't update %s for %s:%s", PATH_MOUNTTAB, hostp, spec);
 724         return (1);
 725 }
 726
 727 /*
 728  * Try to set up the NFS arguments according to the address
 729  * family, protocol (and possibly port) specified in `ai'.
 730  *
 731  * Returns TRYRET_SUCCESS if successful, or:
 732  *   TRYRET_TIMEOUT             The server did not respond.
 733  *   TRYRET_REMOTEERR           The server reported an error.
 734  *   TRYRET_LOCALERR            Local failure.
 735  *
 736  * In all error cases, *errstr will be set to a statically-allocated string
 737  * describing the error.
 738  */
 739 static enum tryret
 740 nfs_tryproto(struct addrinfo *ai, char *hostp, char *spec, char **errstr,
 741     struct iovec **iov, int *iovlen)
 742 {
 743         static char errbuf[256];
 744         struct sockaddr_storage nfs_ss;
 745         struct netbuf nfs_nb;
 746         struct nfhret nfhret;
 747         struct timeval try;
 748         struct rpc_err rpcerr;
 749         CLIENT *clp;
 750         struct netconfig *nconf, *nconf_mnt;
 751         const char *netid, *netid_mnt, *secname;
 752         int doconnect, nfsvers, mntvers, sotype;
 753         enum clnt_stat clntstat;
 754         enum mountmode trymntmode;
 755
 756         sotype = 0;
 757         trymntmode = mountmode;
 758         errbuf[0] = '\0';
 759         *errstr = errbuf;
 760
 761         if (nfsproto == IPPROTO_TCP)
 762                 sotype = SOCK_STREAM;
 763         else if (nfsproto == IPPROTO_UDP)
 764                 sotype = SOCK_DGRAM;
 765
 766         if ((netid = netidbytype(ai->ai_family, sotype)) == NULL) {
 767                 snprintf(errbuf, sizeof errbuf,
 768                     "af %d sotype %d not supported", ai->ai_family, sotype);
 769                 return (TRYRET_LOCALERR);
 770         }
 771         if ((nconf = getnetconf_cached(netid)) == NULL) {
 772                 snprintf(errbuf, sizeof errbuf, "%s: %s", netid, nc_sperror());
 773                 return (TRYRET_LOCALERR);
 774         }
 775         /* The RPCPROG_MNT netid may be different. */
 776         if (mnttcp_ok) {
 777                 netid_mnt = netid;
 778                 nconf_mnt = nconf;
 779         } else {
 780                 if ((netid_mnt = netidbytype(ai->ai_family, SOCK_DGRAM))
 781                      == NULL) {
 782                         snprintf(errbuf, sizeof errbuf,
 783                             "af %d sotype SOCK_DGRAM not supported",
 784                              ai->ai_family);
 785                         return (TRYRET_LOCALERR);
 786                 }
 787                 if ((nconf_mnt = getnetconf_cached(netid_mnt)) == NULL) {
 788                         snprintf(errbuf, sizeof errbuf, "%s: %s", netid_mnt,
 789                             nc_sperror());
 790                         return (TRYRET_LOCALERR);
 791                 }
 792         }
 793
 794 tryagain:
 795         if (trymntmode == V4) {
 796                 nfsvers = 4;
 797                 mntvers = 3; /* Workaround for GCC. */
 798         } else if (trymntmode == V2) {
 799                 nfsvers = 2;
 800                 mntvers = 1;
 801         } else {
 802                 nfsvers = 3;
 803                 mntvers = 3;
 804         }
 805
 806         if (portspec != NULL) {
 807                 /* `ai' contains the complete nfsd sockaddr. */
 808                 nfs_nb.buf = ai->ai_addr;
 809                 nfs_nb.len = nfs_nb.maxlen = ai->ai_addrlen;
 810         } else {
 811                 /* Ask the remote rpcbind. */
 812                 nfs_nb.buf = &nfs_ss;
 813                 nfs_nb.len = nfs_nb.maxlen = sizeof nfs_ss;
 814
 815                 if (!rpcb_getaddr(NFS_PROGRAM, nfsvers, nconf, &nfs_nb,
 816                     hostp)) {
 817                         if (rpc_createerr.cf_stat == RPC_PROGVERSMISMATCH &&
 818                             trymntmode == ANY) {
 819                                 trymntmode = V2;
 820                                 goto tryagain;
 821                         }
 822                         snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s",
 823                             netid, hostp, spec,
 824                             clnt_spcreateerror("RPCPROG_NFS"));
 825                         return (returncode(rpc_createerr.cf_stat,
 826                             &rpc_createerr.cf_error));
 827                 }
 828         }
 829
 830         /* Check that the server (nfsd) responds on the port we have chosen. */
 831         clp = clnt_tli_create(RPC_ANYFD, nconf, &nfs_nb, NFS_PROGRAM, nfsvers,
 832             0, 0);
 833         if (clp == NULL) {
 834                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
 835                     hostp, spec, clnt_spcreateerror("nfsd: RPCPROG_NFS"));
 836                 return (returncode(rpc_createerr.cf_stat,
 837                     &rpc_createerr.cf_error));
 838         }
 839         if (sotype == SOCK_DGRAM && noconn == 0) {
 840                 /*
 841                  * Use connect(), to match what the kernel does. This
 842                  * catches cases where the server responds from the
 843                  * wrong source address.
 844                  */
 845                 doconnect = 1;
 846                 if (!clnt_control(clp, CLSET_CONNECT, (char *)&doconnect)) {
 847                         clnt_destroy(clp);
 848                         snprintf(errbuf, sizeof errbuf,
 849                             "[%s] %s:%s: CLSET_CONNECT failed", netid, hostp,
 850                             spec);
 851                         return (TRYRET_LOCALERR);
 852                 }
 853         }
 854
 855         try.tv_sec = 10;
 856         try.tv_usec = 0;
 857         clntstat = clnt_call(clp, NFSPROC_NULL, (xdrproc_t)xdr_void, NULL,
 858                          (xdrproc_t)xdr_void, NULL, try);
 859         if (clntstat != RPC_SUCCESS) {
 860                 if (clntstat == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
 861                         clnt_destroy(clp);
 862                         trymntmode = V2;
 863                         goto tryagain;
 864                 }
 865                 clnt_geterr(clp, &rpcerr);
 866                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
 867                     hostp, spec, clnt_sperror(clp, "NFSPROC_NULL"));
 868                 clnt_destroy(clp);
 869                 return (returncode(clntstat, &rpcerr));
 870         }
 871         clnt_destroy(clp);
 872
 873         /*
 874          * For NFSv4, there is no mount protocol.
 875          */
 876         if (trymntmode == V4) {
 877                 /*
 878                  * Store the server address in nfsargsp, making
 879                  * sure to copy any locally allocated structures.
 880                  */
 881                 addrlen = nfs_nb.len;
 882                 addr = malloc(addrlen);
 883                 if (addr == NULL)
 884                         err(1, "malloc");
 885                 bcopy(nfs_nb.buf, addr, addrlen);
 886
 887                 build_iovec(iov, iovlen, "addr", addr, addrlen);
 888                 secname = sec_num_to_name(secflavor);
 889                 if (secname != NULL) {
 890                         build_iovec(iov, iovlen, "sec",
 891                             __DECONST(void *, secname), (size_t)-1);
 892                 }
 893                 build_iovec(iov, iovlen, "nfsv4", NULL, 0);
 894                 build_iovec(iov, iovlen, "dirpath", spec, (size_t)-1);
 895
 896                 return (TRYRET_SUCCESS);
 897         }
 898
 899         /* Send the MOUNTPROC_MNT RPC to get the root filehandle. */
 900         try.tv_sec = 10;
 901         try.tv_usec = 0;
 902         clp = clnt_tp_create(hostp, MOUNTPROG, mntvers, nconf_mnt);
 903         if (clp == NULL) {
 904                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
 905                     hostp, spec, clnt_spcreateerror("RPCMNT: clnt_create"));
 906                 return (returncode(rpc_createerr.cf_stat,
 907                     &rpc_createerr.cf_error));
 908         }
 909         clp->cl_auth = authsys_create_default();
 910         nfhret.auth = secflavor;
 911         nfhret.vers = mntvers;
 912         clntstat = clnt_call(clp, MOUNTPROC_MNT, (xdrproc_t)xdr_dir, spec,
 913                          (xdrproc_t)xdr_fh, &nfhret,
 914             try);
 915         auth_destroy(clp->cl_auth);
 916         if (clntstat != RPC_SUCCESS) {
 917                 if (clntstat == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
 918                         clnt_destroy(clp);
 919                         trymntmode = V2;
 920                         goto tryagain;
 921                 }
 922                 clnt_geterr(clp, &rpcerr);
 923                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
 924                     hostp, spec, clnt_sperror(clp, "RPCPROG_MNT"));
 925                 clnt_destroy(clp);
 926                 return (returncode(clntstat, &rpcerr));
 927         }
 928         clnt_destroy(clp);
 929
 930         if (nfhret.stat != 0) {
 931                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
 932                     hostp, spec, strerror(nfhret.stat));
 933                 return (TRYRET_REMOTEERR);
 934         }
 935
 936         /*
 937          * Store the filehandle and server address in nfsargsp, making
 938          * sure to copy any locally allocated structures.
 939          */
 940         addrlen = nfs_nb.len;
 941         addr = malloc(addrlen);
 942         fhsize = nfhret.fhsize;
 943         fh = malloc(fhsize);
 944         if (addr == NULL || fh == NULL)
 945                 err(1, "malloc");
 946         bcopy(nfs_nb.buf, addr, addrlen);
 947         bcopy(nfhret.nfh, fh, fhsize);
 948
 949         build_iovec(iov, iovlen, "addr", addr, addrlen);
 950         build_iovec(iov, iovlen, "fh", fh, fhsize);
 951         secname = sec_num_to_name(nfhret.auth);
 952         if (secname) {
 953                 build_iovec(iov, iovlen, "sec",
 954                     __DECONST(void *, secname), (size_t)-1);
 955         }
 956         if (nfsvers == 3)
 957                 build_iovec(iov, iovlen, "nfsv3", NULL, 0);
 958
 959         return (TRYRET_SUCCESS);
 960 }
 961
 962 /*
 963  * Catagorise a RPC return status and error into an `enum tryret'
 964  * return code.
 965  */
 966 static enum tryret
 967 returncode(enum clnt_stat clntstat, struct rpc_err *rpcerr)
 968 {
 969
 970         switch (clntstat) {
 971         case RPC_TIMEDOUT:
 972                 return (TRYRET_TIMEOUT);
 973         case RPC_PMAPFAILURE:
 974         case RPC_PROGNOTREGISTERED:
 975         case RPC_PROGVERSMISMATCH:
 976         /* XXX, these can be local or remote. */
 977         case RPC_CANTSEND:
 978         case RPC_CANTRECV:
 979                 return (TRYRET_REMOTEERR);
 980         case RPC_SYSTEMERROR:
 981                 switch (rpcerr->re_errno) {
 982                 case ETIMEDOUT:
 983                         return (TRYRET_TIMEOUT);
 984                 case ENOMEM:
 985                         break;
 986                 default:
 987                         return (TRYRET_REMOTEERR);
 988                 }
 989                 /* FALLTHROUGH */
 990         default:
 991                 break;
 992         }
 993         return (TRYRET_LOCALERR);
 994 }
 995
 996 /*
 997  * Look up a netid based on an address family and socket type.
 998  * `af' is the address family, and `sotype' is SOCK_DGRAM or SOCK_STREAM.
 999  *
1000  * XXX there should be a library function for this.
1001  */
1002 static const char *
1003 netidbytype(int af, int sotype)
1004 {
1005         struct nc_protos *p;
1006
1007         for (p = nc_protos; p->netid != NULL; p++) {
1008                 if (af != p->af || sotype != p->sotype)
1009                         continue;
1010                 return (p->netid);
1011         }
1012         return (NULL);
1013 }
1014
1015 /*
1016  * Look up a netconfig entry based on a netid, and cache the result so
1017  * that we don't need to remember to call freenetconfigent().
1018  *
1019  * Otherwise it behaves just like getnetconfigent(), so nc_*error()
1020  * work on failure.
1021  */
1022 static struct netconfig *
1023 getnetconf_cached(const char *netid)
1024 {
1025         static struct nc_entry {
1026                 struct netconfig *nconf;
1027                 struct nc_entry *next;
1028         } *head;
1029         struct nc_entry *p;
1030         struct netconfig *nconf;
1031
1032         for (p = head; p != NULL; p = p->next)
1033                 if (strcmp(netid, p->nconf->nc_netid) == 0)
1034                         return (p->nconf);
1035
1036         if ((nconf = getnetconfigent(netid)) == NULL)
1037                 return (NULL);
1038         if ((p = malloc(sizeof(*p))) == NULL)
1039                 err(1, "malloc");
1040         p->nconf = nconf;
1041         p->next = head;
1042         head = p;
1043
1044         return (p->nconf);
1045 }
1046
1047 /*
1048  * xdr routines for mount rpc's
1049  */
1050 static int
1051 xdr_dir(XDR *xdrsp, char *dirp)
1052 {
1053         return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
1054 }
1055
1056 static int
1057 xdr_fh(XDR *xdrsp, struct nfhret *np)
1058 {
1059         int i;
1060         long auth, authcnt, authfnd = 0;
1061
1062         if (!xdr_u_long(xdrsp, &np->stat))
1063                 return (0);
1064         if (np->stat)
1065                 return (1);
1066         switch (np->vers) {
1067         case 1:
1068                 np->fhsize = NFS_FHSIZE;
1069                 return (xdr_opaque(xdrsp, (caddr_t)np->nfh, NFS_FHSIZE));
1070         case 3:
1071                 if (!xdr_long(xdrsp, &np->fhsize))
1072                         return (0);
1073                 if (np->fhsize <= 0 || np->fhsize > NFS3_FHSIZE)
1074                         return (0);
1075                 if (!xdr_opaque(xdrsp, (caddr_t)np->nfh, np->fhsize))
1076                         return (0);
1077                 if (!xdr_long(xdrsp, &authcnt))
1078                         return (0);
1079                 for (i = 0; i < authcnt; i++) {
1080                         if (!xdr_long(xdrsp, &auth))
1081                                 return (0);
1082                         if (np->auth == -1) {
1083                                 np->auth = auth;
1084                                 authfnd++;
1085                         } else if (auth == np->auth) {
1086                                 authfnd++;
1087                         }
1088                 }
1089                 /*
1090                  * Some servers, such as DEC's OSF/1 return a nil authenticator
1091                  * list to indicate RPCAUTH_UNIX.
1092                  */
1093                 if (authcnt == 0 && np->auth == -1)
1094                         np->auth = AUTH_SYS;
1095                 if (!authfnd && (authcnt > 0 || np->auth != AUTH_SYS))
1096                         np->stat = EAUTH;
1097                 return (1);
1098         }
1099         return (0);
1100 }
1101
1102 static void
1103 usage(void)
1104 {
1105         (void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
1106 "usage: mount_nfs [-23bcdiLlNPsTU] [-a maxreadahead] [-D deadthresh]",
1107 "                 [-g maxgroups] [-I readdirsize] [-o options] [-R retrycnt]",
1108 "                 [-r readsize] [-t timeout] [-w writesize] [-x retrans]",
1109 "                 rhost:path node");
1110         exit(1);
1111 }