sbin/mount_nfs/mount_nfs.c

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