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. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#) Copyright (c) 1992, 1993, 1994 The Regents of the University of California.  All rights reserved.
  37  * @(#)mount_nfs.c      8.11 (Berkeley) 5/4/95
  38  * $FreeBSD: src/sbin/mount_nfs/mount_nfs.c,v 1.36.2.6 2003/05/13 14:45:40 trhodes Exp $
  39  * $DragonFly: src/sbin/mount_nfs/mount_nfs.c,v 1.14 2008/07/14 22:22:40 dillon Exp $
  40  */
  41
  42 #include <sys/param.h>
  43 #include <sys/mount.h>
  44 #include <sys/socket.h>
  45 #include <sys/stat.h>
  46 #include <sys/syslog.h>
  47
  48 #include <rpc/rpc.h>
  49 #include <rpc/pmap_clnt.h>
  50 #include <rpc/pmap_prot.h>
  51
  52 #include <vfs/nfs/rpcv2.h>
  53 #include <vfs/nfs/nfsproto.h>
  54 #include <vfs/nfs/nfs.h>
  55
  56 #include <arpa/inet.h>
  57
  58 #include <ctype.h>
  59 #include <err.h>
  60 #include <errno.h>
  61 #include <fcntl.h>
  62 #include <netdb.h>
  63 #include <stdio.h>
  64 #include <stdlib.h>
  65 #include <strings.h>
  66 #include <sysexits.h>
  67 #include <unistd.h>
  68
  69 #include "mntopts.h"
  70 #include "mounttab.h"
  71
  72 #define ALTF_BG         0x1
  73 #define ALTF_NOCONN     0x2
  74 #define ALTF_DUMBTIMR   0x4
  75 #define ALTF_INTR       0x8
  76 #define ALTF_KERB       0x10
  77 #define ALTF_NFSV3      0x20
  78 #define ALTF_RDIRPLUS   0x40
  79 #define ALTF_MNTUDP     0x80
  80 #define ALTF_RESVPORT   0x100
  81 #define ALTF_SEQPACKET  0x200
  82 #define ALTF_UNUSED400  0x400
  83 #define ALTF_SOFT       0x800
  84 #define ALTF_TCP        0x1000
  85 #define ALTF_PORT       0x2000
  86 #define ALTF_NFSV2      0x4000
  87 #define ALTF_ACREGMIN   0x8000
  88 #define ALTF_ACREGMAX   0x10000
  89 #define ALTF_ACDIRMIN   0x20000
  90 #define ALTF_ACDIRMAX   0x40000
  91
  92 struct mntopt mopts[] = {
  93         MOPT_STDOPTS,
  94         MOPT_FORCE,
  95         MOPT_UPDATE,
  96         MOPT_ASYNC,
  97         { "bg", 0, ALTF_BG, 1 },
  98         { "conn", 1, ALTF_NOCONN, 1 },
  99         { "dumbtimer", 0, ALTF_DUMBTIMR, 1 },
 100         { "intr", 0, ALTF_INTR, 1 },
 101 #ifdef NFSKERB
 102         { "kerb", 0, ALTF_KERB, 1 },
 103 #endif
 104         { "nfsv3", 0, ALTF_NFSV3, 1 },
 105         { "rdirplus", 0, ALTF_RDIRPLUS, 1 },
 106         { "mntudp", 0, ALTF_MNTUDP, 1 },
 107         { "resvport", 0, ALTF_RESVPORT, 1 },
 108         { "soft", 0, ALTF_SOFT, 1 },
 109         { "tcp", 0, ALTF_TCP, 1 },
 110         { "port=", 0, ALTF_PORT, 1 },
 111         { "nfsv2", 0, ALTF_NFSV2, 1 },
 112         { "acregmin=", 0, ALTF_ACREGMIN, 1 },
 113         { "acregmax=", 0, ALTF_ACREGMAX, 1 },
 114         { "acdirmin=", 0, ALTF_ACDIRMIN, 1 },
 115         { "acdirmax=", 0, ALTF_ACDIRMAX, 1 },
 116         MOPT_NULL
 117 };
 118
 119 struct nfs_args nfsdefargs = {
 120         NFS_ARGSVERSION,
 121         (struct sockaddr *)0,
 122         sizeof (struct sockaddr_in),
 123         SOCK_DGRAM,
 124         0,
 125         (u_char *)0,
 126         0,
 127         NFSMNT_RESVPORT,
 128         NFS_WSIZE,
 129         NFS_RSIZE,
 130         NFS_READDIRSIZE,
 131         10,
 132         NFS_RETRANS,
 133         NFS_MAXGRPS,
 134         NFS_DEFRAHEAD,
 135         0,
 136         NFS_DEADTHRESH,
 137         (char *)0,
 138         /* args version 4 */
 139         NFS_MINATTRTIMO,
 140         NFS_MAXATTRTIMO,
 141         NFS_MINDIRATTRTIMO,
 142         NFS_MAXDIRATTRTIMO,
 143 };
 144
 145 /* Table for af,sotype -> netid conversions. */
 146 struct nc_protos {
 147         const char *netid;
 148         int af;
 149         int sotype;
 150 } nc_protos[] = {
 151         {"udp",         AF_INET,        SOCK_DGRAM},
 152         {"tcp",         AF_INET,        SOCK_STREAM},
 153         {"udp6",        AF_INET6,       SOCK_DGRAM},
 154         {"tcp6",        AF_INET6,       SOCK_STREAM},
 155         {NULL,          0,              0}
 156 };
 157
 158 struct nfhret {
 159         u_long          stat;
 160         long            vers;
 161         long            auth;
 162         long            fhsize;
 163         u_char          nfh[NFSX_V3FHMAX];
 164 };
 165 #define BGRND   1
 166 #define ISBGRND 2
 167 int retrycnt = -1;
 168 int opflags = 0;
 169 int nfsproto = IPPROTO_UDP;
 170 int mnttcp_ok = 1;
 171 char *portspec = NULL;  /* Server nfs port; NULL means look up via rpcbind. */
 172 enum mountmode {
 173         ANY,
 174         V2,
 175         V3
 176 } mountmode = ANY;
 177
 178 #ifdef NFSKERB
 179 char inst[INST_SZ];
 180 char realm[REALM_SZ];
 181 struct {
 182         u_long          kind;
 183         KTEXT_ST        kt;
 184 } ktick;
 185 struct nfsrpc_nickverf kverf;
 186 struct nfsrpc_fullblock kin, kout;
 187 NFSKERBKEY_T kivec;
 188 CREDENTIALS kcr;
 189 struct timeval ktv;
 190 NFSKERBKEYSCHED_T kerb_keysched;
 191 #endif
 192
 193 /* Return codes for nfs_tryproto. */
 194 enum tryret {
 195         TRYRET_SUCCESS,
 196         TRYRET_TIMEOUT,         /* No response received. */
 197         TRYRET_REMOTEERR,       /* Error received from remote server. */
 198         TRYRET_LOCALERR         /* Local failure. */
 199 };
 200
 201 #if 0
 202 void    set_rpc_maxgrouplist(int);
 203 #endif
 204 static struct netconfig *getnetconf_cached(const char *);
 205 static const char       *netidbytype(int, int);
 206 static int      getnfsargs(char *, struct nfs_args *);
 207 static void     usage(void) __dead2;
 208 static int      xdr_dir(XDR *, char *);
 209 static int      xdr_fh(XDR *, struct nfhret *);
 210 static enum tryret
 211                 nfs_tryproto(struct nfs_args *, struct addrinfo *,
 212                              char *, char *, char **);
 213 static enum tryret
 214                 returncode(enum clnt_stat, struct rpc_err *);
 215
 216 /*
 217  * Used to set mount flags with getmntopts.  Call with dir=TRUE to
 218  * initialize altflags from the current mount flags.  Call with
 219  * dir=FALSE to update mount flags with the new value of altflags after
 220  * the call to getmntopts.
 221  */
 222 static void
 223 set_flags(int* altflags, int* nfsflags, int dir)
 224 {
 225 #define F2(af, nf)                                      \
 226         if (dir) {                                      \
 227                 if (*nfsflags & NFSMNT_##nf)            \
 228                         *altflags |= ALTF_##af;         \
 229                 else                                    \
 230                         *altflags &= ~ALTF_##af;        \
 231         } else {                                        \
 232                 if (*altflags & ALTF_##af)              \
 233                         *nfsflags |= NFSMNT_##nf;       \
 234                 else                                    \
 235                         *nfsflags &= ~NFSMNT_##nf;      \
 236         }
 237 #define F(f)    F2(f,f)
 238
 239         F(NOCONN);
 240         F(DUMBTIMR);
 241         F2(INTR, INT);
 242 #ifdef NFSKERB
 243         F(KERB);
 244 #endif
 245         F(RDIRPLUS);
 246         F(RESVPORT);
 247         F(SOFT);
 248         F(ACREGMIN);
 249         F(ACREGMAX);
 250         F(ACDIRMIN);
 251         F(ACDIRMAX);
 252
 253 #undef F
 254 #undef F2
 255 }
 256
 257 int
 258 main(int argc, char **argv)
 259 {
 260         int c;
 261         struct nfs_args *nfsargsp;
 262         struct nfs_args nfsargs;
 263         struct nfsd_cargs ncd;
 264         int mntflags, altflags, nfssvc_flag, num;
 265         char *name, *p, *spec;
 266         char mntpath[MAXPATHLEN];
 267         struct vfsconf vfc;
 268         int error = 0;
 269 #ifdef NFSKERB
 270         uid_t last_ruid;
 271
 272         last_ruid = -1;
 273         strcpy(realm, KRB_REALM);
 274         if (sizeof (struct nfsrpc_nickverf) != RPCX_NICKVERF ||
 275             sizeof (struct nfsrpc_fullblock) != RPCX_FULLBLOCK ||
 276             ((char *)&ktick.kt) - ((char *)&ktick) != NFSX_UNSIGNED ||
 277             ((char *)ktick.kt.dat) - ((char *)&ktick) != 2 * NFSX_UNSIGNED)
 278                 fprintf(stderr, "Yikes! NFSKERB structs not packed!!\n");
 279 #endif /* NFSKERB */
 280
 281         mntflags = 0;
 282         altflags = 0;
 283         nfsargs = nfsdefargs;
 284         nfsargsp = &nfsargs;
 285         while ((c = getopt(argc, argv,
 286             "23a:bcdD:g:I:iKlm:No:PR:r:sTt:w:x:U")) != -1)
 287                 switch (c) {
 288                 case '2':
 289                         mountmode = V2;
 290                         break;
 291                 case '3':
 292                         mountmode = V3;
 293                         break;
 294                 case 'a':
 295                         num = strtol(optarg, &p, 10);
 296                         if (*p || num < 0)
 297                                 errx(1, "illegal -a value -- %s", optarg);
 298                         nfsargsp->readahead = num;
 299                         nfsargsp->flags |= NFSMNT_READAHEAD;
 300                         break;
 301                 case 'b':
 302                         opflags |= BGRND;
 303                         break;
 304                 case 'c':
 305                         nfsargsp->flags |= NFSMNT_NOCONN;
 306                         break;
 307                 case 'D':
 308                         num = strtol(optarg, &p, 10);
 309                         if (*p || num <= 0)
 310                                 errx(1, "illegal -D value -- %s", optarg);
 311                         nfsargsp->deadthresh = num;
 312                         nfsargsp->flags |= NFSMNT_DEADTHRESH;
 313                         break;
 314                 case 'd':
 315                         nfsargsp->flags |= NFSMNT_DUMBTIMR;
 316                         break;
 317 #if 0 /* XXXX */
 318                 case 'g':
 319                         num = strtol(optarg, &p, 10);
 320                         if (*p || num <= 0)
 321                                 errx(1, "illegal -g value -- %s", optarg);
 322                         set_rpc_maxgrouplist(num);
 323                         nfsargsp->maxgrouplist = num;
 324                         nfsargsp->flags |= NFSMNT_MAXGRPS;
 325                         break;
 326 #endif
 327                 case 'I':
 328                         num = strtol(optarg, &p, 10);
 329                         if (*p || num <= 0)
 330                                 errx(1, "illegal -I value -- %s", optarg);
 331                         nfsargsp->readdirsize = num;
 332                         nfsargsp->flags |= NFSMNT_READDIRSIZE;
 333                         break;
 334                 case 'i':
 335                         nfsargsp->flags |= NFSMNT_INT;
 336                         break;
 337 #ifdef NFSKERB
 338                 case 'K':
 339                         nfsargsp->flags |= NFSMNT_KERB;
 340                         break;
 341 #endif
 342                 case 'l':
 343                         nfsargsp->flags |= NFSMNT_RDIRPLUS;
 344                         break;
 345 #ifdef NFSKERB
 346                 case 'm':
 347                         strncpy(realm, optarg, REALM_SZ - 1);
 348                         realm[REALM_SZ - 1] = '\0';
 349                         break;
 350 #endif
 351                 case 'N':
 352                         nfsargsp->flags &= ~NFSMNT_RESVPORT;
 353                         break;
 354                 case 'o':
 355                         altflags = 0;
 356                         set_flags(&altflags, &nfsargsp->flags, TRUE);
 357                         if (mountmode == V2)
 358                                 altflags |= ALTF_NFSV2;
 359                         else if (mountmode == V3)
 360                                 altflags |= ALTF_NFSV3;
 361                         getmntopts(optarg, mopts, &mntflags, &altflags);
 362                         set_flags(&altflags, &nfsargsp->flags, FALSE);
 363                         /*
 364                          * Handle altflags which don't map directly to
 365                          * mount flags.
 366                          */
 367                         if(altflags & ALTF_BG)
 368                                 opflags |= BGRND;
 369                         if(altflags & ALTF_MNTUDP)
 370                                 mnttcp_ok = 0;
 371                         if(altflags & ALTF_TCP) {
 372                                 nfsargsp->sotype = SOCK_STREAM;
 373                                 nfsproto = IPPROTO_TCP;
 374                         }
 375                         if(altflags & ALTF_PORT) {
 376                                 /*
 377                                  * XXX Converting from a string to an int
 378                                  * and back again is silly, and we should
 379                                  * allow /etc/services names.
 380                                  */
 381                                 asprintf(&portspec, "%d",
 382                                     atoi(strstr(optarg, "port=") + 5));
 383                                 if (portspec == NULL)
 384                                         err(1, "asprintf");
 385                         }
 386                         mountmode = ANY;
 387                         if(altflags & ALTF_NFSV2)
 388                                 mountmode = V2;
 389                         if(altflags & ALTF_NFSV3)
 390                                 mountmode = V3;
 391                         if(altflags & ALTF_ACREGMIN)
 392                                 nfsargsp->acregmin = atoi(strstr(optarg,
 393                                     "acregmin=") + 9);
 394                         if(altflags & ALTF_ACREGMAX)
 395                                 nfsargsp->acregmax = atoi(strstr(optarg,
 396                                     "acregmax=") + 9);
 397                         if(altflags & ALTF_ACDIRMIN)
 398                                 nfsargsp->acdirmin = atoi(strstr(optarg,
 399                                     "acdirmin=") + 9);
 400                         if(altflags & ALTF_ACDIRMAX)
 401                                 nfsargsp->acdirmax = atoi(strstr(optarg,
 402                                     "acdirmax=") + 9);
 403                         break;
 404                 case 'P':
 405                         /* obsolete for NFSMNT_RESVPORT, now default */
 406                         break;
 407                 case 'R':
 408                         num = strtol(optarg, &p, 10);
 409                         if (*p || num < 0)
 410                                 errx(1, "illegal -R value -- %s", optarg);
 411                         retrycnt = num;
 412                         break;
 413                 case 'r':
 414                         num = strtol(optarg, &p, 10);
 415                         if (*p || num <= 0)
 416                                 errx(1, "illegal -r value -- %s", optarg);
 417                         nfsargsp->rsize = num;
 418                         nfsargsp->flags |= NFSMNT_RSIZE;
 419                         break;
 420                 case 's':
 421                         nfsargsp->flags |= NFSMNT_SOFT;
 422                         break;
 423                 case 'T':
 424                         nfsargsp->sotype = SOCK_STREAM;
 425                         nfsproto = IPPROTO_TCP;
 426                         break;
 427                 case 't':
 428                         num = strtol(optarg, &p, 10);
 429                         if (*p || num <= 0)
 430                                 errx(1, "illegal -t value -- %s", optarg);
 431                         nfsargsp->timeo = num;
 432                         nfsargsp->flags |= NFSMNT_TIMEO;
 433                         break;
 434                 case 'w':
 435                         num = strtol(optarg, &p, 10);
 436                         if (*p || num <= 0)
 437                                 errx(1, "illegal -w value -- %s", optarg);
 438                         nfsargsp->wsize = num;
 439                         nfsargsp->flags |= NFSMNT_WSIZE;
 440                         break;
 441                 case 'x':
 442                         num = strtol(optarg, &p, 10);
 443                         if (*p || num <= 0)
 444                                 errx(1, "illegal -x value -- %s", optarg);
 445                         nfsargsp->retrans = num;
 446                         nfsargsp->flags |= NFSMNT_RETRANS;
 447                         break;
 448                 case 'U':
 449                         mnttcp_ok = 0;
 450                         break;
 451                 default:
 452                         usage();
 453                         break;
 454                 }
 455         argc -= optind;
 456         argv += optind;
 457
 458         if (argc != 2) {
 459                 usage();
 460                 /* NOTREACHED */
 461         }
 462
 463         spec = *argv++;
 464         name = *argv;
 465
 466         if (retrycnt == -1)
 467                 /* The default is to keep retrying forever. */
 468                 retrycnt = 0;
 469         if (!getnfsargs(spec, nfsargsp))
 470                 exit(1);
 471
 472         /* resolve the mountpoint with realpath(3) */
 473         checkpath(name, mntpath);
 474
 475         error = getvfsbyname("nfs", &vfc);
 476         if (error && vfsisloadable("nfs")) {
 477                 if(vfsload("nfs"))
 478                         err(EX_OSERR, "vfsload(nfs)");
 479                 endvfsent();    /* clear cache */
 480                 error = getvfsbyname("nfs", &vfc);
 481         }
 482         if (error)
 483                 errx(EX_OSERR, "nfs filesystem is not available");
 484
 485         if (mount(vfc.vfc_name, mntpath, mntflags, nfsargsp))
 486                 err(1, "%s", mntpath);
 487         if (nfsargsp->flags & NFSMNT_KERB) {
 488                 if ((opflags & ISBGRND) == 0) {
 489                         if (daemon(0, 0) != 0)
 490                                 err(1, "daemon");
 491                 }
 492                 openlog("mount_nfs", LOG_PID, LOG_DAEMON);
 493                 nfssvc_flag = NFSSVC_MNTD;
 494                 ncd.ncd_dirp = mntpath;
 495                 while (nfssvc(nfssvc_flag, (caddr_t)&ncd) < 0) {
 496                         if (errno != ENEEDAUTH) {
 497                                 syslog(LOG_ERR, "nfssvc err %m");
 498                                 continue;
 499                         }
 500                         nfssvc_flag =
 501                             NFSSVC_MNTD | NFSSVC_GOTAUTH | NFSSVC_AUTHINFAIL;
 502 #ifdef NFSKERB
 503                         /*
 504                          * Set up as ncd_authuid for the kerberos call.
 505                          * Must set ruid to ncd_authuid and reset the
 506                          * ticket name iff ncd_authuid is not the same
 507                          * as last time, so that the right ticket file
 508                          * is found.
 509                          * Get the Kerberos credential structure so that
 510                          * we have the session key and get a ticket for
 511                          * this uid.
 512                          * For more info see the IETF Draft "Authentication
 513                          * in ONC RPC".
 514                          */
 515                         if (ncd.ncd_authuid != last_ruid) {
 516                                 char buf[512];
 517                                 sprintf(buf, "%s%d", TKT_ROOT, ncd.ncd_authuid);
 518                                 krb_set_tkt_string(buf);
 519                                 last_ruid = ncd.ncd_authuid;
 520                         }
 521                         setreuid(ncd.ncd_authuid, 0);
 522                         kret = krb_get_cred(NFS_KERBSRV, inst, realm, &kcr);
 523                         if (kret == RET_NOTKT) {
 524                             kret = get_ad_tkt(NFS_KERBSRV, inst, realm,
 525                                 DEFAULT_TKT_LIFE);
 526                             if (kret == KSUCCESS)
 527                                 kret = krb_get_cred(NFS_KERBSRV, inst, realm,
 528                                     &kcr);
 529                         }
 530                         if (kret == KSUCCESS)
 531                             kret = krb_mk_req(&ktick.kt, NFS_KERBSRV, inst,
 532                                 realm, 0);
 533
 534                         /*
 535                          * Fill in the AKN_FULLNAME authenticator and verifier.
 536                          * Along with the Kerberos ticket, we need to build
 537                          * the timestamp verifier and encrypt it in CBC mode.
 538                          */
 539                         if (kret == KSUCCESS &&
 540                             ktick.kt.length <= (RPCAUTH_MAXSIZ-3*NFSX_UNSIGNED)
 541                             && gettimeofday(&ktv, (struct timezone *)0) == 0) {
 542                             ncd.ncd_authtype = RPCAUTH_KERB4;
 543                             ncd.ncd_authstr = (u_char *)&ktick;
 544                             ncd.ncd_authlen = nfsm_rndup(ktick.kt.length) +
 545                                 3 * NFSX_UNSIGNED;
 546                             ncd.ncd_verfstr = (u_char *)&kverf;
 547                             ncd.ncd_verflen = sizeof (kverf);
 548                             memmove(ncd.ncd_key, kcr.session,
 549                                 sizeof (kcr.session));
 550                             kin.t1 = htonl(ktv.tv_sec);
 551                             kin.t2 = htonl(ktv.tv_usec);
 552                             kin.w1 = htonl(NFS_KERBTTL);
 553                             kin.w2 = htonl(NFS_KERBTTL - 1);
 554                             bzero((caddr_t)kivec, sizeof (kivec));
 555
 556                             /*
 557                              * Encrypt kin in CBC mode using the session
 558                              * key in kcr.
 559                              */
 560                             XXX
 561
 562                             /*
 563                              * Finally, fill the timestamp verifier into the
 564                              * authenticator and verifier.
 565                              */
 566                             ktick.kind = htonl(RPCAKN_FULLNAME);
 567                             kverf.kind = htonl(RPCAKN_FULLNAME);
 568                             NFS_KERBW1(ktick.kt) = kout.w1;
 569                             ktick.kt.length = htonl(ktick.kt.length);
 570                             kverf.verf.t1 = kout.t1;
 571                             kverf.verf.t2 = kout.t2;
 572                             kverf.verf.w2 = kout.w2;
 573                             nfssvc_flag = NFSSVC_MNTD | NFSSVC_GOTAUTH;
 574                         }
 575                         setreuid(0, 0);
 576 #endif /* NFSKERB */
 577                 }
 578         }
 579         exit(0);
 580 }
 581
 582 static int
 583 getnfsargs(char *spec, struct nfs_args *nfsargsp)
 584 {
 585         struct addrinfo hints, *ai_nfs, *ai;
 586 #ifdef NFSKERB
 587         char host[NI_MAXHOST], serv[NI_MAXSERV];
 588 #endif
 589         enum tryret ret;
 590         int ecode, speclen, remoteerr;
 591         char *hostp, *delimp, *errstr;
 592 #ifdef NFSKERB
 593         char *cp;
 594 #endif
 595         size_t len;
 596         static char nam[MNAMELEN + 1];
 597
 598         if ((delimp = strrchr(spec, ':')) != NULL) {
 599                 hostp = spec;
 600                 spec = delimp + 1;
 601         } else if ((delimp = strrchr(spec, '@')) != NULL) {
 602                 warnx("path@server syntax is deprecated, use server:path");
 603                 hostp = delimp + 1;
 604         } else {
 605                 warnx("no <host>:<dirpath> nfs-name");
 606                 return (0);
 607         }
 608         *delimp = '\0';
 609
 610         /*
 611          * If there has been a trailing slash at mounttime it seems
 612          * that some mountd implementations fail to remove the mount
 613          * entries from their mountlist while unmounting.
 614          */
 615         for (speclen = strlen(spec);
 616                 speclen > 1 && spec[speclen - 1] == '/';
 617                 speclen--)
 618                 spec[speclen - 1] = '\0';
 619         if (strlen(hostp) + strlen(spec) + 1 > MNAMELEN) {
 620                 warnx("%s:%s: %s", hostp, spec, strerror(ENAMETOOLONG));
 621                 return (0);
 622         }
 623         /* Make both '@' and ':' notations equal */
 624         if (*hostp != '\0') {
 625                 len = strlen(hostp);
 626                 memmove(nam, hostp, len);
 627                 nam[len] = ':';
 628                 memmove(nam + len + 1, spec, speclen);
 629                 nam[len + speclen + 1] = '\0';
 630         }
 631
 632         /*
 633          * Handle an internet host address and reverse resolve it if
 634          * doing Kerberos.
 635          */
 636         memset(&hints, 0, sizeof hints);
 637         hints.ai_flags = AI_NUMERICHOST;
 638         hints.ai_socktype = nfsargsp->sotype;
 639         if (getaddrinfo(hostp, portspec, &hints, &ai_nfs) == 0) {
 640 #ifdef NFSKERB
 641                 if ((nfsargsp->flags & NFSMNT_KERB)) {
 642                         hints.ai_flags = 0;
 643                         if (getnameinfo(ai_nfs->ai_addr, ai_nfs->ai_addrlen,
 644                             host, sizeof host, serv, sizeof serv, 0) != 0) {
 645                                 warnx("can't reverse resolve net address");
 646                                         return (0);
 647                                 }
 648                         hostp = host;
 649                 }
 650 #endif /* NFSKERB */
 651         } else {
 652                 hints.ai_flags = 0;
 653                 if ((ecode = getaddrinfo(hostp, portspec, &hints, &ai_nfs))
 654                     != 0) {
 655                         if (portspec == NULL)
 656                                 errx(1, "%s: %s", hostp, gai_strerror(ecode));
 657                         else
 658                                 errx(1, "%s:%s: %s", hostp, portspec,
 659                                     gai_strerror(ecode));
 660                         return (0);
 661                 }
 662         }
 663 #ifdef NFSKERB
 664         if (nfsargsp->flags & NFSMNT_KERB) {
 665                 strncpy(inst, hp->h_name, INST_SZ);
 666                 inst[INST_SZ - 1] = '\0';
 667                 if (cp = strchr(inst, '.'))
 668                         *cp = '\0';
 669         }
 670 #endif /* NFSKERB */
 671
 672         ret = TRYRET_LOCALERR;
 673         for (;;) {
 674                 /*
 675                  * Try each entry returned by getaddrinfo(). Note the
 676                  * occurence of remote errors by setting `remoteerr'.
 677                  */
 678                 remoteerr = 0;
 679                 for (ai = ai_nfs; ai != NULL; ai = ai->ai_next) {
 680                         ret = nfs_tryproto(nfsargsp, ai, hostp, spec, &errstr);
 681                         if (ret == TRYRET_SUCCESS)
 682                                 break;
 683                         if (ret != TRYRET_LOCALERR)
 684                                 remoteerr = 1;
 685                         if ((opflags & ISBGRND) == 0)
 686                                 fprintf(stderr, "%s\n", errstr);
 687                 }
 688                 if (ret == TRYRET_SUCCESS)
 689                         break;
 690
 691                 /* Exit if all errors were local. */
 692                 if (!remoteerr)
 693                         exit(1);
 694
 695                 /*
 696                  * If retrycnt == 0, we are to keep retrying forever.
 697                  * Otherwise decrement it, and exit if it hits zero.
 698                  */
 699                 if (retrycnt != 0 && --retrycnt == 0)
 700                         exit(1);
 701
 702                 if ((opflags & (BGRND | ISBGRND)) == BGRND) {
 703                         warnx("Cannot immediately mount %s:%s, backgrounding",
 704                             hostp, spec);
 705                         opflags |= ISBGRND;
 706                         if (daemon(0, 0) != 0)
 707                                 err(1, "daemon");
 708                 }
 709                 sleep(60);
 710         }
 711         freeaddrinfo(ai_nfs);
 712         nfsargsp->hostname = nam;
 713         /* Add mounted filesystem to PATH_MOUNTTAB */
 714         if (!add_mtab(hostp, spec))
 715                 warnx("can't update %s for %s:%s", PATH_MOUNTTAB, hostp, spec);
 716         return (1);
 717 }
 718
 719 /*
 720  * Try to set up the NFS arguments according to the address
 721  * family, protocol (and possibly port) specified in `ai'.
 722  *
 723  * Returns TRYRET_SUCCESS if successful, or:
 724  *   TRYRET_TIMEOUT             The server did not respond.
 725  *   TRYRET_REMOTEERR           The server reported an error.
 726  *   TRYRET_LOCALERR            Local failure.
 727  *
 728  * In all error cases, *errstr will be set to a statically-allocated string
 729  * describing the error.
 730  */
 731 static enum tryret
 732 nfs_tryproto(struct nfs_args *nfsargsp, struct addrinfo *ai, char *hostp,
 733     char *spec, char **errstr)
 734 {
 735         static char errbuf[256];
 736         struct sockaddr_storage nfs_ss;
 737         struct netbuf nfs_nb;
 738         struct nfhret nfhret;
 739         struct timeval try;
 740         struct rpc_err rpcerr;
 741         CLIENT *clp;
 742         struct netconfig *nconf, *nconf_mnt;
 743         const char *netid, *netid_mnt;
 744         int doconnect, nfsvers, mntvers;
 745         enum clnt_stat status;
 746         enum mountmode trymntmode;
 747
 748         trymntmode = mountmode;
 749         errbuf[0] = '\0';
 750         *errstr = errbuf;
 751
 752         if ((netid = netidbytype(ai->ai_family, nfsargsp->sotype)) == NULL) {
 753                 snprintf(errbuf, sizeof errbuf,
 754                     "af %d sotype %d not supported", ai->ai_family,
 755                     nfsargsp->sotype);
 756                 return (TRYRET_LOCALERR);
 757         }
 758         if ((nconf = getnetconf_cached(netid)) == NULL) {
 759                 snprintf(errbuf, sizeof errbuf, "%s: %s", netid, nc_sperror());
 760                 return (TRYRET_LOCALERR);
 761         }
 762         /* The RPCPROG_MNT netid may be different. */
 763         if (mnttcp_ok) {
 764                 netid_mnt = netid;
 765                 nconf_mnt = nconf;
 766         } else {
 767                 if ((netid_mnt = netidbytype(ai->ai_family, SOCK_DGRAM))
 768                      == NULL) {
 769                         snprintf(errbuf, sizeof errbuf,
 770                             "af %d sotype SOCK_DGRAM not supported",
 771                              ai->ai_family);
 772                         return (TRYRET_LOCALERR);
 773                 }
 774                 if ((nconf_mnt = getnetconf_cached(netid_mnt)) == NULL) {
 775                         snprintf(errbuf, sizeof errbuf, "%s: %s", netid_mnt,
 776                             nc_sperror());
 777                         return (TRYRET_LOCALERR);
 778                 }
 779         }
 780
 781 tryagain:
 782         if (trymntmode == V2) {
 783                 nfsvers = 2;
 784                 mntvers = 1;
 785         } else {
 786                 nfsvers = 3;
 787                 mntvers = 3;
 788         }
 789
 790         if (portspec != NULL) {
 791                 /* `ai' contains the complete nfsd sockaddr. */
 792                 nfs_nb.buf = ai->ai_addr;
 793                 nfs_nb.len = nfs_nb.maxlen = ai->ai_addrlen;
 794         } else {
 795                 /* Ask the remote rpcbind. */
 796                 nfs_nb.buf = &nfs_ss;
 797                 nfs_nb.len = nfs_nb.maxlen = sizeof nfs_ss;
 798
 799                 if (!rpcb_getaddr(RPCPROG_NFS, nfsvers, nconf, &nfs_nb,
 800                     hostp)) {
 801                         if (rpc_createerr.cf_stat == RPC_PROGVERSMISMATCH &&
 802                             trymntmode == ANY) {
 803                                 trymntmode = V2;
 804                                 goto tryagain;
 805                         }
 806                         snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s",
 807                             netid, hostp, spec,
 808                             clnt_spcreateerror("RPCPROG_NFS"));
 809                         return (returncode(rpc_createerr.cf_stat,
 810                             &rpc_createerr.cf_error));
 811                 }
 812         }
 813
 814         /* Check that the server (nfsd) responds on the port we have chosen. */
 815         clp = clnt_tli_create(RPC_ANYFD, nconf, &nfs_nb, RPCPROG_NFS, nfsvers,
 816             0, 0);
 817         if (clp == NULL) {
 818                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
 819                     hostp, spec, clnt_spcreateerror("nfsd: RPCPROG_NFS"));
 820                 return (returncode(rpc_createerr.cf_stat,
 821                     &rpc_createerr.cf_error));
 822         }
 823         if (nfsargsp->sotype == SOCK_DGRAM &&
 824             !(nfsargsp->flags & NFSMNT_NOCONN)) {
 825                 /*
 826                  * Use connect(), to match what the kernel does. This
 827                  * catches cases where the server responds from the
 828                  * wrong source address.
 829                  */
 830                 doconnect = 1;
 831                 if (!clnt_control(clp, CLSET_CONNECT, (char *)&doconnect)) {
 832                         clnt_destroy(clp);
 833                         snprintf(errbuf, sizeof errbuf,
 834                             "[%s] %s:%s: CLSET_CONNECT failed", netid, hostp,
 835                             spec);
 836                         return (TRYRET_LOCALERR);
 837                 }
 838         }
 839
 840         try.tv_sec = 10;
 841         try.tv_usec = 0;
 842         status = clnt_call(clp, NFSPROC_NULL, (xdrproc_t)xdr_void, NULL,
 843             (xdrproc_t)xdr_void, NULL, try);
 844         if (status != RPC_SUCCESS) {
 845                 if (status == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
 846                         clnt_destroy(clp);
 847                         trymntmode = V2;
 848                         goto tryagain;
 849                 }
 850                 clnt_geterr(clp, &rpcerr);
 851                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
 852                     hostp, spec, clnt_sperror(clp, "NFSPROC_NULL"));
 853                 clnt_destroy(clp);
 854                 return (returncode(status, &rpcerr));
 855         }
 856         clnt_destroy(clp);
 857
 858         /* Send the RPCMNT_MOUNT RPC to get the root filehandle. */
 859         try.tv_sec = 10;
 860         try.tv_usec = 0;
 861         clp = clnt_tp_create(hostp, RPCPROG_MNT, mntvers, nconf_mnt);
 862         if (clp == NULL) {
 863                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
 864                     hostp, spec, clnt_spcreateerror("RPCMNT: clnt_create"));
 865                 return (returncode(rpc_createerr.cf_stat,
 866                     &rpc_createerr.cf_error));
 867         }
 868         clp->cl_auth = authsys_create_default();
 869         if (nfsargsp->flags & NFSMNT_KERB)
 870                 nfhret.auth = RPCAUTH_KERB4;
 871         else
 872                 nfhret.auth = RPCAUTH_UNIX;
 873         nfhret.vers = mntvers;
 874         status = clnt_call(clp, RPCMNT_MOUNT, (xdrproc_t)xdr_dir, spec,
 875             (xdrproc_t)xdr_fh, &nfhret, try);
 876         auth_destroy(clp->cl_auth);
 877         if (status != RPC_SUCCESS) {
 878                 if (status == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
 879                         clnt_destroy(clp);
 880                         trymntmode = V2;
 881                         goto tryagain;
 882                 }
 883                 clnt_geterr(clp, &rpcerr);
 884                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
 885                     hostp, spec, clnt_sperror(clp, "RPCPROG_MNT"));
 886                 clnt_destroy(clp);
 887                 return (returncode(status, &rpcerr));
 888         }
 889         clnt_destroy(clp);
 890
 891         if (nfhret.stat != 0) {
 892                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
 893                     hostp, spec, strerror(nfhret.stat));
 894                 return (TRYRET_REMOTEERR);
 895         }
 896
 897         /*
 898          * Store the filehandle and server address in nfsargsp, making
 899          * sure to copy any locally allocated structures.
 900          */
 901         nfsargsp->addrlen = nfs_nb.len;
 902         nfsargsp->addr = malloc(nfsargsp->addrlen);
 903         nfsargsp->fhsize = nfhret.fhsize;
 904         nfsargsp->fh = malloc(nfsargsp->fhsize);
 905         if (nfsargsp->addr == NULL || nfsargsp->fh == NULL)
 906                 err(1, "malloc");
 907         bcopy(nfs_nb.buf, nfsargsp->addr, nfsargsp->addrlen);
 908         bcopy(nfhret.nfh, nfsargsp->fh, nfsargsp->fhsize);
 909
 910         if (nfsvers == 3)
 911                 nfsargsp->flags |= NFSMNT_NFSV3;
 912         else
 913                 nfsargsp->flags &= ~NFSMNT_NFSV3;
 914
 915         return (TRYRET_SUCCESS);
 916 }
 917
 918
 919 /*
 920  * Catagorise a RPC return status and error into an `enum tryret'
 921  * return code.
 922  */
 923 static enum tryret
 924 returncode(enum clnt_stat status, struct rpc_err *rpcerr)
 925 {
 926         switch (status) {
 927         case RPC_TIMEDOUT:
 928                 return (TRYRET_TIMEOUT);
 929         case RPC_PMAPFAILURE:
 930         case RPC_PROGNOTREGISTERED:
 931         case RPC_PROGVERSMISMATCH:
 932         /* XXX, these can be local or remote. */
 933         case RPC_CANTSEND:
 934         case RPC_CANTRECV:
 935                 return (TRYRET_REMOTEERR);
 936         case RPC_SYSTEMERROR:
 937                 switch (rpcerr->re_errno) {
 938                 case ETIMEDOUT:
 939                         return (TRYRET_TIMEOUT);
 940                 case ENOMEM:
 941                         break;
 942                 default:
 943                         return (TRYRET_REMOTEERR);
 944                 }
 945                 /* FALLTHROUGH */
 946         default:
 947                 break;
 948         }
 949         return (TRYRET_LOCALERR);
 950 }
 951
 952 /*
 953  * Look up a netid based on an address family and socket type.
 954  * `af' is the address family, and `sotype' is SOCK_DGRAM or SOCK_STREAM.
 955  *
 956  * XXX there should be a library function for this.
 957  */
 958 static const char *
 959 netidbytype(int af, int sotype)
 960 {
 961         struct nc_protos *p;
 962
 963         for (p = nc_protos; p->netid != NULL; p++) {
 964                 if (af != p->af || sotype != p->sotype)
 965                         continue;
 966                 return (p->netid);
 967         }
 968         return (NULL);
 969 }
 970
 971 /*
 972  * Look up a netconfig entry based on a netid, and cache the result so
 973  * that we don't need to remember to call freenetconfigent().
 974  *
 975  * Otherwise it behaves just like getnetconfigent(), so nc_*error()
 976  * work on failure.
 977  */
 978 static struct netconfig *
 979 getnetconf_cached(const char *netid)
 980 {
 981         static struct nc_entry {
 982                 struct netconfig *nconf;
 983                 struct nc_entry *next;
 984         } *head;
 985         struct nc_entry *p;
 986         struct netconfig *nconf;
 987
 988         for (p = head; p != NULL; p = p->next)
 989                 if (strcmp(netid, p->nconf->nc_netid) == 0)
 990                         return (p->nconf);
 991
 992         if ((nconf = getnetconfigent(netid)) == NULL)
 993                 return (NULL);
 994         if ((p = malloc(sizeof(*p))) == NULL)
 995                 err(1, "malloc");
 996         p->nconf = nconf;
 997         p->next = head;
 998         head = p;
 999
1000         return (p->nconf);
1001 }
1002
1003 /*
1004  * xdr routines for mount rpc's
1005  */
1006 static int
1007 xdr_dir(XDR *xdrsp, char *dirp)
1008 {
1009         return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
1010 }
1011
1012 static int
1013 xdr_fh(XDR *xdrsp, struct nfhret *np)
1014 {
1015         int i;
1016         long auth, authcnt, authfnd = 0;
1017
1018         if (!xdr_u_long(xdrsp, &np->stat))
1019                 return (0);
1020         if (np->stat)
1021                 return (1);
1022         switch (np->vers) {
1023         case 1:
1024                 np->fhsize = NFSX_V2FH;
1025                 return (xdr_opaque(xdrsp, (caddr_t)np->nfh, NFSX_V2FH));
1026         case 3:
1027                 if (!xdr_long(xdrsp, &np->fhsize))
1028                         return (0);
1029                 if (np->fhsize <= 0 || np->fhsize > NFSX_V3FHMAX)
1030                         return (0);
1031                 if (!xdr_opaque(xdrsp, (caddr_t)np->nfh, np->fhsize))
1032                         return (0);
1033                 if (!xdr_long(xdrsp, &authcnt))
1034                         return (0);
1035                 for (i = 0; i < authcnt; i++) {
1036                         if (!xdr_long(xdrsp, &auth))
1037                                 return (0);
1038                         if (auth == np->auth)
1039                                 authfnd++;
1040                 }
1041                 /*
1042                  * Some servers, such as DEC's OSF/1 return a nil authenticator
1043                  * list to indicate RPCAUTH_UNIX.
1044                  */
1045                 if (!authfnd && (authcnt > 0 || np->auth != RPCAUTH_UNIX))
1046                         np->stat = EAUTH;
1047                 return (1);
1048         };
1049         return (0);
1050 }
1051
1052 static void
1053 usage(void)
1054 {
1055         fprintf(stderr, "%s\n%s\n%s\n%s\n",
1056 "usage: mount_nfs [-23KNPTUbcdils] [-D deadthresh] [-I readdirsize]",
1057 "                 [-R retrycnt] [-a maxreadahead]",
1058 "                 [-g maxgroups] [-m realm] [-o options] [-r readsize]",
1059 "                 [-t timeout] [-w writesize] [-x retrans] rhost:path node");
1060         exit(1);
1061 }