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  * @(#) Copyright (c) 1992, 1993, 1994 The Regents of the University of California.  All rights reserved.
  33  * @(#)mount_nfs.c      8.11 (Berkeley) 5/4/95
  34  * $FreeBSD: src/sbin/mount_nfs/mount_nfs.c,v 1.36.2.6 2003/05/13 14:45:40 trhodes Exp $
  35  */
  36
  37 #include <sys/param.h>
  38 #include <sys/mount.h>
  39 #include <sys/socket.h>
  40 #include <sys/stat.h>
  41 #include <sys/syslog.h>
  42
  43 #include <rpc/rpc.h>
  44 #include <rpc/pmap_clnt.h>
  45 #include <rpc/pmap_prot.h>
  46
  47 #include <vfs/nfs/rpcv2.h>
  48 #include <vfs/nfs/nfsproto.h>
  49 #include <vfs/nfs/nfs.h>
  50
  51 #include <arpa/inet.h>
  52
  53 #include <ctype.h>
  54 #include <err.h>
  55 #include <errno.h>
  56 #include <fcntl.h>
  57 #include <mntopts.h>
  58 #include <netdb.h>
  59 #include <stdio.h>
  60 #include <stdlib.h>
  61 #include <string.h>
  62 #include <sysexits.h>
  63 #include <unistd.h>
  64
  65 #include "mounttab.h"
  66
  67 #define ALTF_BG         0x1
  68 #define ALTF_NOCONN     0x2
  69 #define ALTF_DUMBTIMR   0x4
  70 #define ALTF_INTR       0x8
  71 /* 0x10 was for ALTF_KERB */
  72 #define ALTF_NFSV3      0x20
  73 #define ALTF_RDIRPLUS   0x40
  74 #define ALTF_CACHE      0x80
  75 #define ALTF_RESVPORT   0x100
  76 #define ALTF_SEQPACKET  0x200
  77 #define ALTF_UNUSED400  0x400
  78 #define ALTF_SOFT       0x800
  79 #define ALTF_TCP        0x1000
  80 #define ALTF_PORT       0x2000
  81 #define ALTF_NFSV2      0x4000
  82 #define ALTF_ACREGMIN   0x8000
  83 #define ALTF_ACREGMAX   0x10000
  84 #define ALTF_ACDIRMIN   0x20000
  85 #define ALTF_ACDIRMAX   0x40000
  86 #define ALTF_RETRYCNT   0x80000
  87
  88 struct mntopt mopts[] = {
  89         MOPT_STDOPTS,
  90         MOPT_FORCE,
  91         MOPT_UPDATE,
  92         MOPT_ASYNC,
  93         { "bg", 0, ALTF_BG, 1 },
  94         { "conn", 1, ALTF_NOCONN, 1 },
  95         { "dumbtimer", 0, ALTF_DUMBTIMR, 1 },
  96         { "intr", 0, ALTF_INTR, 1 },
  97         { "nfsv3", 0, ALTF_NFSV3, 1 },
  98         { "rdirplus", 0, ALTF_RDIRPLUS, 1 },
  99         { "mntudp", 1, ALTF_TCP, 1 },
 100         { "resvport", 0, ALTF_RESVPORT, 1 },
 101         { "soft", 0, ALTF_SOFT, 1 },
 102         { "tcp", 0, ALTF_TCP, 1 },
 103         { "udp", 1, ALTF_TCP, 1 },
 104         { "port=", 0, ALTF_PORT, 1 },
 105         { "nfsv2", 0, ALTF_NFSV2, 1 },
 106         { "acregmin=", 0, ALTF_ACREGMIN, 1 },
 107         { "acregmax=", 0, ALTF_ACREGMAX, 1 },
 108         { "acdirmin=", 0, ALTF_ACDIRMIN, 1 },
 109         { "acdirmax=", 0, ALTF_ACDIRMAX, 1 },
 110         { "cache", 0, ALTF_CACHE, 1 },
 111         { "retrycnt=", 0, ALTF_RETRYCNT, 1 },
 112         MOPT_NULL
 113 };
 114
 115 struct nfs_args nfsdefargs = {
 116         NFS_ARGSVERSION,
 117         NULL,
 118         sizeof (struct sockaddr_in),
 119         0,
 120         0,
 121         NULL,
 122         0,
 123         NFSMNT_RESVPORT,
 124         NFS_WSIZE,
 125         NFS_RSIZE,
 126         NFS_READDIRSIZE,
 127         10,
 128         NFS_RETRANS,
 129         NFS_MAXGRPS,
 130         NFS_DEFRAHEAD,
 131         0,
 132         NFS_DEADTHRESH,
 133         NULL,
 134         /* args version 4 */
 135         NFS_MINATTRTIMO,
 136         NFS_MAXATTRTIMO,
 137         NFS_MINDIRATTRTIMO,
 138         NFS_MAXDIRATTRTIMO,
 139 };
 140
 141 /* Table for af,sotype -> netid conversions. */
 142 struct nc_protos {
 143         const char *netid;
 144         int af;
 145         int sotype;
 146 } nc_protos[] = {
 147         {"udp",         AF_INET,        SOCK_DGRAM},
 148         {"tcp",         AF_INET,        SOCK_STREAM},
 149         {"udp6",        AF_INET6,       SOCK_DGRAM},
 150         {"tcp6",        AF_INET6,       SOCK_STREAM},
 151         {NULL,          0,              0}
 152 };
 153
 154 struct nfhret {
 155         u_long          stat;
 156         long            vers;
 157         long            auth;
 158         long            fhsize;
 159         u_char          nfh[NFSX_V3FHMAX];
 160 };
 161 #define BGRND   1
 162 #define ISBGRND 2
 163 int retrycnt = -1;
 164 int opflags = 0;
 165 int nfsproto;
 166 char *portspec = NULL;  /* Server nfs port; NULL means look up via rpcbind. */
 167 enum mountmode {
 168         ANY,
 169         V2,
 170         V3
 171 } mountmode = ANY;
 172
 173 /* Return codes for nfs_tryproto. */
 174 enum tryret {
 175         TRYRET_SUCCESS,
 176         TRYRET_TIMEOUT,         /* No response received. */
 177         TRYRET_REMOTEERR,       /* Error received from remote server. */
 178         TRYRET_LOCALERR         /* Local failure. */
 179 };
 180
 181 #if 0
 182 void    set_rpc_maxgrouplist(int);
 183 #endif
 184 static struct netconfig *getnetconf_cached(const char *);
 185 static const char       *netidbytype(int, int);
 186 static int      getnfsargs(char *, struct nfs_args *);
 187 static void     usage(void) __dead2;
 188 static int      xdr_dir(XDR *, char *);
 189 static int      xdr_fh(XDR *, struct nfhret *);
 190 static enum tryret
 191                 nfs_tryproto(struct nfs_args *, struct addrinfo *,
 192                              char *, char *, char **);
 193 static enum tryret
 194                 returncode(enum clnt_stat, struct rpc_err *);
 195
 196 /*
 197  * Used to set mount flags with getmntopts.  Call with dir=TRUE to
 198  * initialize altflags from the current mount flags.  Call with
 199  * dir=FALSE to update mount flags with the new value of altflags after
 200  * the call to getmntopts.
 201  */
 202 static void
 203 set_flags(int* altflags, int* nfsflags, int dir)
 204 {
 205 #define F2(af, nf)                                      \
 206         if (dir) {                                      \
 207                 if (*nfsflags & NFSMNT_##nf)            \
 208                         *altflags |= ALTF_##af;         \
 209                 else                                    \
 210                         *altflags &= ~ALTF_##af;        \
 211         } else {                                        \
 212                 if (*altflags & ALTF_##af)              \
 213                         *nfsflags |= NFSMNT_##nf;       \
 214                 else                                    \
 215                         *nfsflags &= ~NFSMNT_##nf;      \
 216         }
 217 #define F(f)    F2(f,f)
 218
 219         F(NOCONN);
 220         F(DUMBTIMR);
 221         F2(INTR, INT);
 222         F(RDIRPLUS);
 223         F(RESVPORT);
 224         F(SOFT);
 225         F(ACREGMIN);
 226         F(ACREGMAX);
 227         F(ACDIRMIN);
 228         F(ACDIRMAX);
 229 #ifdef NFSMNT_CACHE
 230         F(CACHE);
 231 #endif
 232         F(RETRYCNT);
 233
 234 #undef F
 235 #undef F2
 236 }
 237
 238 int
 239 main(int argc, char **argv)
 240 {
 241         int c;
 242         struct nfs_args *nfsargsp;
 243         struct nfs_args nfsargs;
 244         int mntflags, altflags, num;
 245         char *name, *p, *spec;
 246         char mntpath[MAXPATHLEN];
 247         struct vfsconf vfc;
 248         int error = 0;
 249
 250         mntflags = 0;
 251         altflags = ALTF_TCP | ALTF_RDIRPLUS;
 252         nfsargs = nfsdefargs;
 253         nfsargsp = &nfsargs;
 254         if (altflags & ALTF_TCP) {
 255                 nfsproto = IPPROTO_TCP;
 256                 nfsargsp->sotype = SOCK_STREAM;
 257         } else {
 258                 nfsproto = IPPROTO_UDP;
 259                 nfsargsp->sotype = SOCK_DGRAM;
 260         }
 261         while ((c = getopt(argc, argv,
 262             "23a:bcdD:g:I:ilNo:PR:r:sTt:w:x:U")) != -1)
 263                 switch (c) {
 264                 case '2':
 265                         mountmode = V2;
 266                         break;
 267                 case '3':
 268                         mountmode = V3;
 269                         break;
 270                 case 'a':
 271                         num = strtol(optarg, &p, 10);
 272                         if (*p || num < 0)
 273                                 errx(1, "illegal -a value -- %s", optarg);
 274                         nfsargsp->readahead = num;
 275                         nfsargsp->flags |= NFSMNT_READAHEAD;
 276                         break;
 277                 case 'b':
 278                         opflags |= BGRND;
 279                         break;
 280                 case 'c':
 281                         nfsargsp->flags |= NFSMNT_NOCONN;
 282                         break;
 283                 case 'D':
 284                         num = strtol(optarg, &p, 10);
 285                         if (*p || num <= 0)
 286                                 errx(1, "illegal -D value -- %s", optarg);
 287                         nfsargsp->deadthresh = num;
 288                         nfsargsp->flags |= NFSMNT_DEADTHRESH;
 289                         break;
 290                 case 'd':
 291                         nfsargsp->flags |= NFSMNT_DUMBTIMR;
 292                         break;
 293 #if 0 /* XXXX */
 294                 case 'g':
 295                         num = strtol(optarg, &p, 10);
 296                         if (*p || num <= 0)
 297                                 errx(1, "illegal -g value -- %s", optarg);
 298                         set_rpc_maxgrouplist(num);
 299                         nfsargsp->maxgrouplist = num;
 300                         nfsargsp->flags |= NFSMNT_MAXGRPS;
 301                         break;
 302 #endif
 303                 case 'I':
 304                         num = strtol(optarg, &p, 10);
 305                         if (*p || num <= 0)
 306                                 errx(1, "illegal -I value -- %s", optarg);
 307                         nfsargsp->readdirsize = num;
 308                         nfsargsp->flags |= NFSMNT_READDIRSIZE;
 309                         break;
 310                 case 'i':
 311                         nfsargsp->flags |= NFSMNT_INT;
 312                         break;
 313                 case 'l':
 314                         nfsargsp->flags |= NFSMNT_RDIRPLUS;
 315                         break;
 316                 case 'N':
 317                         nfsargsp->flags &= ~NFSMNT_RESVPORT;
 318                         break;
 319                 case 'o':
 320                         set_flags(&altflags, &nfsargsp->flags, TRUE);
 321                         altflags |= ALTF_RDIRPLUS;
 322                         if (nfsproto == IPPROTO_TCP)
 323                                 altflags |= ALTF_TCP;
 324                         if (mountmode == V2)
 325                                 altflags |= ALTF_NFSV2;
 326                         else if (mountmode == V3)
 327                                 altflags |= ALTF_NFSV3;
 328                         getmntopts(optarg, mopts, &mntflags, &altflags);
 329                         set_flags(&altflags, &nfsargsp->flags, FALSE);
 330                         /*
 331                          * Handle altflags which don't map directly to
 332                          * mount flags.
 333                          */
 334                         if(altflags & ALTF_BG)
 335                                 opflags |= BGRND;
 336                         if (altflags & ALTF_TCP) {
 337                                 nfsproto = IPPROTO_TCP;
 338                                 nfsargsp->sotype = SOCK_STREAM;
 339                         } else {
 340                                 nfsproto = IPPROTO_UDP;
 341                                 nfsargsp->sotype = SOCK_DGRAM;
 342                         }
 343                         if(altflags & ALTF_PORT) {
 344                                 /*
 345                                  * XXX Converting from a string to an int
 346                                  * and back again is silly, and we should
 347                                  * allow /etc/services names.
 348                                  */
 349                                 asprintf(&portspec, "%d",
 350                                          atoi(strstr(optarg, "port=") + 5));
 351                                 if (portspec == NULL)
 352                                         err(1, "asprintf");
 353                         }
 354                         mountmode = ANY;
 355                         if(altflags & ALTF_NFSV2)
 356                                 mountmode = V2;
 357                         if(altflags & ALTF_NFSV3)
 358                                 mountmode = V3;
 359                         if(altflags & ALTF_ACREGMIN)
 360                                 nfsargsp->acregmin = atoi(strstr(optarg,
 361                                     "acregmin=") + 9);
 362                         if(altflags & ALTF_ACREGMAX)
 363                                 nfsargsp->acregmax = atoi(strstr(optarg,
 364                                     "acregmax=") + 9);
 365                         if(altflags & ALTF_ACDIRMIN)
 366                                 nfsargsp->acdirmin = atoi(strstr(optarg,
 367                                     "acdirmin=") + 9);
 368                         if(altflags & ALTF_ACDIRMAX)
 369                                 nfsargsp->acdirmax = atoi(strstr(optarg,
 370                                     "acdirmax=") + 9);
 371                         if(altflags & ALTF_RETRYCNT) {
 372                                 num = atoi(strstr(optarg, "retrycnt=") + 9);
 373                                 if (num < 0)
 374                                         errx(1, "illegal -o retrycnt value -- %s", optarg);
 375                                 retrycnt = num;
 376                         }
 377                         break;
 378                 case 'P':
 379                         /* obsolete for NFSMNT_RESVPORT, now default */
 380                         break;
 381                 case 'R':
 382                         num = strtol(optarg, &p, 10);
 383                         if (*p || num < 0)
 384                                 errx(1, "illegal -R value -- %s", optarg);
 385                         retrycnt = num;
 386                         break;
 387                 case 'r':
 388                         num = strtol(optarg, &p, 10);
 389                         if (*p || num <= 0)
 390                                 errx(1, "illegal -r value -- %s", optarg);
 391                         nfsargsp->rsize = num;
 392                         nfsargsp->flags |= NFSMNT_RSIZE;
 393                         break;
 394                 case 's':
 395                         nfsargsp->flags |= NFSMNT_SOFT;
 396                         break;
 397                 case 'T':
 398                         nfsargsp->sotype = SOCK_STREAM;
 399                         nfsproto = IPPROTO_TCP;
 400                         altflags |= ALTF_TCP;
 401                         break;
 402                 case 't':
 403                         num = strtol(optarg, &p, 10);
 404                         if (*p || num <= 0)
 405                                 errx(1, "illegal -t value -- %s", optarg);
 406                         nfsargsp->timeo = num;
 407                         nfsargsp->flags |= NFSMNT_TIMEO;
 408                         break;
 409                 case 'w':
 410                         num = strtol(optarg, &p, 10);
 411                         if (*p || num <= 0)
 412                                 errx(1, "illegal -w value -- %s", optarg);
 413                         nfsargsp->wsize = num;
 414                         nfsargsp->flags |= NFSMNT_WSIZE;
 415                         break;
 416                 case 'x':
 417                         num = strtol(optarg, &p, 10);
 418                         if (*p || num <= 0)
 419                                 errx(1, "illegal -x value -- %s", optarg);
 420                         nfsargsp->retrans = num;
 421                         nfsargsp->flags |= NFSMNT_RETRANS;
 422                         break;
 423                 case 'U':
 424                         nfsargsp->sotype = SOCK_DGRAM;
 425                         nfsproto = IPPROTO_UDP;
 426                         altflags &= ~ALTF_TCP;
 427                         break;
 428                 default:
 429                         usage();
 430                         break;
 431                 }
 432         argc -= optind;
 433         argv += optind;
 434
 435         if (argc != 2) {
 436                 usage();
 437                 /* NOTREACHED */
 438         }
 439
 440         spec = *argv++;
 441         name = *argv;
 442
 443         if (retrycnt == -1)
 444                 /* The default is to keep retrying forever. */
 445                 retrycnt = 0;
 446         if (!getnfsargs(spec, nfsargsp))
 447                 exit(1);
 448
 449         /* resolve the mountpoint with realpath(3) */
 450         checkpath(name, mntpath);
 451
 452         error = getvfsbyname("nfs", &vfc);
 453         if (error && vfsisloadable("nfs")) {
 454                 if(vfsload("nfs"))
 455                         err(EX_OSERR, "vfsload(nfs)");
 456                 endvfsent();    /* clear cache */
 457                 error = getvfsbyname("nfs", &vfc);
 458         }
 459         if (error)
 460                 errx(EX_OSERR, "nfs filesystem is not available");
 461
 462         if (mount(vfc.vfc_name, mntpath, mntflags, nfsargsp))
 463                 err(1, "%s", mntpath);
 464         exit(0);
 465 }
 466
 467 static int
 468 getnfsargs(char *spec, struct nfs_args *nfsargsp)
 469 {
 470         struct addrinfo hints, *ai_nfs, *ai;
 471         enum tryret ret;
 472         int ecode, speclen, remoteerr;
 473         char *hostp, *delimp, *errstr;
 474         size_t len;
 475         static char nam[MNAMELEN + 1];
 476
 477         if ((delimp = strrchr(spec, ':')) != NULL) {
 478                 hostp = spec;
 479                 spec = delimp + 1;
 480         } else if ((delimp = strrchr(spec, '@')) != NULL) {
 481                 warnx("path@server syntax is deprecated, use server:path");
 482                 hostp = delimp + 1;
 483         } else {
 484                 warnx("no <host>:<dirpath> nfs-name");
 485                 return (0);
 486         }
 487         *delimp = '\0';
 488
 489         /*
 490          * If there has been a trailing slash at mounttime it seems
 491          * that some mountd implementations fail to remove the mount
 492          * entries from their mountlist while unmounting.
 493          */
 494         for (speclen = strlen(spec);
 495                 speclen > 1 && spec[speclen - 1] == '/';
 496                 speclen--)
 497                 spec[speclen - 1] = '\0';
 498         if (strlen(hostp) + strlen(spec) + 1 > MNAMELEN) {
 499                 warnx("%s:%s: %s", hostp, spec, strerror(ENAMETOOLONG));
 500                 return (0);
 501         }
 502         /* Make both '@' and ':' notations equal */
 503         if (*hostp != '\0') {
 504                 len = strlen(hostp);
 505                 memmove(nam, hostp, len);
 506                 nam[len] = ':';
 507                 memmove(nam + len + 1, spec, speclen);
 508                 nam[len + speclen + 1] = '\0';
 509         }
 510
 511         /*
 512          * Handle an internet host address.
 513          */
 514         memset(&hints, 0, sizeof hints);
 515         hints.ai_flags = AI_NUMERICHOST;
 516         hints.ai_socktype = nfsargsp->sotype;
 517         if (getaddrinfo(hostp, portspec, &hints, &ai_nfs) != 0) {
 518                 hints.ai_flags = 0;
 519                 if ((ecode = getaddrinfo(hostp, portspec, &hints, &ai_nfs))
 520                     != 0) {
 521                         if (portspec == NULL)
 522                                 errx(1, "%s: %s", hostp, gai_strerror(ecode));
 523                         else
 524                                 errx(1, "%s:%s: %s", hostp, portspec,
 525                                     gai_strerror(ecode));
 526                         return (0);
 527                 }
 528         }
 529
 530         ret = TRYRET_LOCALERR;
 531         for (;;) {
 532                 /*
 533                  * Try each entry returned by getaddrinfo(). Note the
 534                  * occurence of remote errors by setting `remoteerr'.
 535                  */
 536                 remoteerr = 0;
 537                 for (ai = ai_nfs; ai != NULL; ai = ai->ai_next) {
 538                         ret = nfs_tryproto(nfsargsp, ai, hostp, spec, &errstr);
 539                         if (ret == TRYRET_SUCCESS)
 540                                 break;
 541                         if (ret != TRYRET_LOCALERR)
 542                                 remoteerr = 1;
 543                         if ((opflags & ISBGRND) == 0)
 544                                 fprintf(stderr, "%s\n", errstr);
 545                 }
 546                 if (ret == TRYRET_SUCCESS)
 547                         break;
 548
 549                 /* Exit if all errors were local. */
 550                 if (!remoteerr)
 551                         exit(1);
 552
 553                 /*
 554                  * If retrycnt == 0, we are to keep retrying forever.
 555                  * Otherwise decrement it, and exit if it hits zero.
 556                  */
 557                 if (retrycnt != 0 && --retrycnt == 0)
 558                         exit(1);
 559
 560                 if ((opflags & (BGRND | ISBGRND)) == BGRND) {
 561                         warnx("Cannot immediately mount %s:%s, backgrounding",
 562                             hostp, spec);
 563                         opflags |= ISBGRND;
 564                         if (daemon(0, 0) != 0)
 565                                 err(1, "daemon");
 566                 }
 567                 sleep(60);
 568         }
 569         freeaddrinfo(ai_nfs);
 570         nfsargsp->hostname = nam;
 571         /* Add mounted filesystem to PATH_MOUNTTAB */
 572         if (!add_mtab(hostp, spec))
 573                 warnx("can't update %s for %s:%s", PATH_MOUNTTAB, hostp, spec);
 574         return (1);
 575 }
 576
 577 /*
 578  * Try to set up the NFS arguments according to the address
 579  * family, protocol (and possibly port) specified in `ai'.
 580  *
 581  * Returns TRYRET_SUCCESS if successful, or:
 582  *   TRYRET_TIMEOUT             The server did not respond.
 583  *   TRYRET_REMOTEERR           The server reported an error.
 584  *   TRYRET_LOCALERR            Local failure.
 585  *
 586  * In all error cases, *errstr will be set to a statically-allocated string
 587  * describing the error.
 588  */
 589 static enum tryret
 590 nfs_tryproto(struct nfs_args *nfsargsp, struct addrinfo *ai, char *hostp,
 591     char *spec, char **errstr)
 592 {
 593         static char errbuf[256];
 594         struct sockaddr_storage nfs_ss;
 595         struct netbuf nfs_nb;
 596         struct nfhret nfhret;
 597         struct timeval try;
 598         struct rpc_err rpcerr;
 599         CLIENT *clp;
 600         struct netconfig *nconf, *nconf_mnt;
 601         const char *netid, *netid_mnt;
 602         int doconnect, nfsvers, mntvers;
 603         enum clnt_stat status;
 604         enum mountmode trymntmode;
 605
 606         trymntmode = mountmode;
 607         errbuf[0] = '\0';
 608         *errstr = errbuf;
 609
 610         if ((netid = netidbytype(ai->ai_family, nfsargsp->sotype)) == NULL) {
 611                 snprintf(errbuf, sizeof errbuf,
 612                     "af %d sotype %d not supported", ai->ai_family,
 613                     nfsargsp->sotype);
 614                 return (TRYRET_LOCALERR);
 615         }
 616         if ((nconf = getnetconf_cached(netid)) == NULL) {
 617                 snprintf(errbuf, sizeof errbuf, "%s: %s", netid, nc_sperror());
 618                 return (TRYRET_LOCALERR);
 619         }
 620
 621         netid_mnt = netid;
 622         nconf_mnt = nconf;
 623
 624 tryagain:
 625         if (trymntmode == V2) {
 626                 nfsvers = 2;
 627                 mntvers = 1;
 628         } else {
 629                 nfsvers = 3;
 630                 mntvers = 3;
 631         }
 632
 633         if (portspec != NULL) {
 634                 /* `ai' contains the complete nfsd sockaddr. */
 635                 nfs_nb.buf = ai->ai_addr;
 636                 nfs_nb.len = nfs_nb.maxlen = ai->ai_addrlen;
 637         } else {
 638                 /* Ask the remote rpcbind. */
 639                 nfs_nb.buf = &nfs_ss;
 640                 nfs_nb.len = nfs_nb.maxlen = sizeof nfs_ss;
 641
 642                 if (!rpcb_getaddr(RPCPROG_NFS, nfsvers, nconf, &nfs_nb,
 643                     hostp)) {
 644                         if (rpc_createerr.cf_stat == RPC_PROGVERSMISMATCH &&
 645                             trymntmode == ANY) {
 646                                 trymntmode = V2;
 647                                 goto tryagain;
 648                         }
 649                         snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s",
 650                             netid, hostp, spec,
 651                             clnt_spcreateerror("RPCPROG_NFS"));
 652                         return (returncode(rpc_createerr.cf_stat,
 653                             &rpc_createerr.cf_error));
 654                 }
 655         }
 656
 657         /* Check that the server (nfsd) responds on the port we have chosen. */
 658         clp = clnt_tli_create(RPC_ANYFD, nconf, &nfs_nb, RPCPROG_NFS, nfsvers,
 659             0, 0);
 660         if (clp == NULL) {
 661                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
 662                     hostp, spec, clnt_spcreateerror("nfsd: RPCPROG_NFS"));
 663                 return (returncode(rpc_createerr.cf_stat,
 664                     &rpc_createerr.cf_error));
 665         }
 666         if (nfsargsp->sotype == SOCK_DGRAM &&
 667             !(nfsargsp->flags & NFSMNT_NOCONN)) {
 668                 /*
 669                  * Use connect(), to match what the kernel does. This
 670                  * catches cases where the server responds from the
 671                  * wrong source address.
 672                  */
 673                 doconnect = 1;
 674                 if (!clnt_control(clp, CLSET_CONNECT, (char *)&doconnect)) {
 675                         clnt_destroy(clp);
 676                         snprintf(errbuf, sizeof errbuf,
 677                             "[%s] %s:%s: CLSET_CONNECT failed", netid, hostp,
 678                             spec);
 679                         return (TRYRET_LOCALERR);
 680                 }
 681         }
 682
 683         try.tv_sec = 10;
 684         try.tv_usec = 0;
 685         status = clnt_call(clp, NFSPROC_NULL, (xdrproc_t)xdr_void, NULL,
 686             (xdrproc_t)xdr_void, NULL, try);
 687         if (status != RPC_SUCCESS) {
 688                 if (status == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
 689                         clnt_destroy(clp);
 690                         trymntmode = V2;
 691                         goto tryagain;
 692                 }
 693                 clnt_geterr(clp, &rpcerr);
 694                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
 695                     hostp, spec, clnt_sperror(clp, "NFSPROC_NULL"));
 696                 clnt_destroy(clp);
 697                 return (returncode(status, &rpcerr));
 698         }
 699         clnt_destroy(clp);
 700
 701         /* Send the RPCMNT_MOUNT RPC to get the root filehandle. */
 702         try.tv_sec = 10;
 703         try.tv_usec = 0;
 704         clp = clnt_tp_create(hostp, RPCPROG_MNT, mntvers, nconf_mnt);
 705         if (clp == NULL) {
 706                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
 707                     hostp, spec, clnt_spcreateerror("RPCMNT: clnt_create"));
 708                 return (returncode(rpc_createerr.cf_stat,
 709                     &rpc_createerr.cf_error));
 710         }
 711         clp->cl_auth = authsys_create_default();
 712         nfhret.auth = RPCAUTH_UNIX;
 713         nfhret.vers = mntvers;
 714         status = clnt_call(clp, RPCMNT_MOUNT, (xdrproc_t)xdr_dir, spec,
 715             (xdrproc_t)xdr_fh, &nfhret, try);
 716         auth_destroy(clp->cl_auth);
 717         if (status != RPC_SUCCESS) {
 718                 if (status == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
 719                         clnt_destroy(clp);
 720                         trymntmode = V2;
 721                         goto tryagain;
 722                 }
 723                 clnt_geterr(clp, &rpcerr);
 724                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
 725                     hostp, spec, clnt_sperror(clp, "RPCPROG_MNT"));
 726                 clnt_destroy(clp);
 727                 return (returncode(status, &rpcerr));
 728         }
 729         clnt_destroy(clp);
 730
 731         if (nfhret.stat != 0) {
 732                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
 733                     hostp, spec, strerror(nfhret.stat));
 734                 return (TRYRET_REMOTEERR);
 735         }
 736
 737         /*
 738          * Store the filehandle and server address in nfsargsp, making
 739          * sure to copy any locally allocated structures.
 740          */
 741         nfsargsp->addrlen = nfs_nb.len;
 742         nfsargsp->addr = malloc(nfsargsp->addrlen);
 743         nfsargsp->fhsize = nfhret.fhsize;
 744         nfsargsp->fh = malloc(nfsargsp->fhsize);
 745         if (nfsargsp->addr == NULL || nfsargsp->fh == NULL)
 746                 err(1, "malloc");
 747         bcopy(nfs_nb.buf, nfsargsp->addr, nfsargsp->addrlen);
 748         bcopy(nfhret.nfh, nfsargsp->fh, nfsargsp->fhsize);
 749
 750         if (nfsvers == 3)
 751                 nfsargsp->flags |= NFSMNT_NFSV3;
 752         else
 753                 nfsargsp->flags &= ~NFSMNT_NFSV3;
 754
 755         return (TRYRET_SUCCESS);
 756 }
 757
 758
 759 /*
 760  * Catagorise a RPC return status and error into an `enum tryret'
 761  * return code.
 762  */
 763 static enum tryret
 764 returncode(enum clnt_stat status, struct rpc_err *rpcerr)
 765 {
 766         switch (status) {
 767         case RPC_TIMEDOUT:
 768                 return (TRYRET_TIMEOUT);
 769         case RPC_PMAPFAILURE:
 770         case RPC_PROGNOTREGISTERED:
 771         case RPC_PROGVERSMISMATCH:
 772         /* XXX, these can be local or remote. */
 773         case RPC_CANTSEND:
 774         case RPC_CANTRECV:
 775                 return (TRYRET_REMOTEERR);
 776         case RPC_SYSTEMERROR:
 777                 switch (rpcerr->re_errno) {
 778                 case ETIMEDOUT:
 779                         return (TRYRET_TIMEOUT);
 780                 case ENOMEM:
 781                         break;
 782                 default:
 783                         return (TRYRET_REMOTEERR);
 784                 }
 785                 /* FALLTHROUGH */
 786         default:
 787                 break;
 788         }
 789         return (TRYRET_LOCALERR);
 790 }
 791
 792 /*
 793  * Look up a netid based on an address family and socket type.
 794  * `af' is the address family, and `sotype' is SOCK_DGRAM or SOCK_STREAM.
 795  *
 796  * XXX there should be a library function for this.
 797  */
 798 static const char *
 799 netidbytype(int af, int sotype)
 800 {
 801         struct nc_protos *p;
 802
 803         for (p = nc_protos; p->netid != NULL; p++) {
 804                 if (af != p->af || sotype != p->sotype)
 805                         continue;
 806                 return (p->netid);
 807         }
 808         return (NULL);
 809 }
 810
 811 /*
 812  * Look up a netconfig entry based on a netid, and cache the result so
 813  * that we don't need to remember to call freenetconfigent().
 814  *
 815  * Otherwise it behaves just like getnetconfigent(), so nc_*error()
 816  * work on failure.
 817  */
 818 static struct netconfig *
 819 getnetconf_cached(const char *netid)
 820 {
 821         static struct nc_entry {
 822                 struct netconfig *nconf;
 823                 struct nc_entry *next;
 824         } *head;
 825         struct nc_entry *p;
 826         struct netconfig *nconf;
 827
 828         for (p = head; p != NULL; p = p->next)
 829                 if (strcmp(netid, p->nconf->nc_netid) == 0)
 830                         return (p->nconf);
 831
 832         if ((nconf = getnetconfigent(netid)) == NULL)
 833                 return (NULL);
 834         if ((p = malloc(sizeof(*p))) == NULL)
 835                 err(1, "malloc");
 836         p->nconf = nconf;
 837         p->next = head;
 838         head = p;
 839
 840         return (p->nconf);
 841 }
 842
 843 /*
 844  * xdr routines for mount rpc's
 845  */
 846 static int
 847 xdr_dir(XDR *xdrsp, char *dirp)
 848 {
 849         return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
 850 }
 851
 852 static int
 853 xdr_fh(XDR *xdrsp, struct nfhret *np)
 854 {
 855         int i;
 856         long auth, authcnt, authfnd = 0;
 857
 858         if (!xdr_u_long(xdrsp, &np->stat))
 859                 return (0);
 860         if (np->stat)
 861                 return (1);
 862         switch (np->vers) {
 863         case 1:
 864                 np->fhsize = NFSX_V2FH;
 865                 return (xdr_opaque(xdrsp, (caddr_t)np->nfh, NFSX_V2FH));
 866         case 3:
 867                 if (!xdr_long(xdrsp, &np->fhsize))
 868                         return (0);
 869                 if (np->fhsize <= 0 || np->fhsize > NFSX_V3FHMAX)
 870                         return (0);
 871                 if (!xdr_opaque(xdrsp, (caddr_t)np->nfh, np->fhsize))
 872                         return (0);
 873                 if (!xdr_long(xdrsp, &authcnt))
 874                         return (0);
 875                 for (i = 0; i < authcnt; i++) {
 876                         if (!xdr_long(xdrsp, &auth))
 877                                 return (0);
 878                         if (auth == np->auth)
 879                                 authfnd++;
 880                 }
 881                 /*
 882                  * Some servers, such as DEC's OSF/1 return a nil authenticator
 883                  * list to indicate RPCAUTH_UNIX.
 884                  */
 885                 if (!authfnd && (authcnt > 0 || np->auth != RPCAUTH_UNIX))
 886                         np->stat = EAUTH;
 887                 return (1);
 888         }
 889         return (0);
 890 }
 891
 892 static void
 893 usage(void)
 894 {
 895         fprintf(stderr, "%s\n%s\n%s\n%s\n",
 896 "usage: mount_nfs [-23NPTUbcdils] [-D deadthresh] [-I readdirsize]",
 897 "                 [-R retrycnt] [-a maxreadahead]",
 898 "                 [-g maxgroups] [-o options] [-r readsize]",
 899 "                 [-t timeout] [-w writesize] [-x retrans] rhost:path node");
 900         exit(1);
 901 }