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