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 <string.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_UNUSED080  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", 1, ALTF_TCP, 1 },
 107         { "resvport", 0, ALTF_RESVPORT, 1 },
 108         { "soft", 0, ALTF_SOFT, 1 },
 109         { "tcp", 0, ALTF_TCP, 1 },
 110         { "udp", 1, ALTF_TCP, 1 },
 111         { "port=", 0, ALTF_PORT, 1 },
 112         { "nfsv2", 0, ALTF_NFSV2, 1 },
 113         { "acregmin=", 0, ALTF_ACREGMIN, 1 },
 114         { "acregmax=", 0, ALTF_ACREGMAX, 1 },
 115         { "acdirmin=", 0, ALTF_ACDIRMIN, 1 },
 116         { "acdirmax=", 0, ALTF_ACDIRMAX, 1 },
 117         MOPT_NULL
 118 };
 119
 120 struct nfs_args nfsdefargs = {
 121         NFS_ARGSVERSION,
 122         NULL,
 123         sizeof (struct sockaddr_in),
 124         0,
 125         0,
 126         NULL,
 127         0,
 128         NFSMNT_RESVPORT,
 129         NFS_WSIZE,
 130         NFS_RSIZE,
 131         NFS_READDIRSIZE,
 132         10,
 133         NFS_RETRANS,
 134         NFS_MAXGRPS,
 135         NFS_DEFRAHEAD,
 136         0,
 137         NFS_DEADTHRESH,
 138         NULL,
 139         /* args version 4 */
 140         NFS_MINATTRTIMO,
 141         NFS_MAXATTRTIMO,
 142         NFS_MINDIRATTRTIMO,
 143         NFS_MAXDIRATTRTIMO,
 144 };
 145
 146 /* Table for af,sotype -> netid conversions. */
 147 struct nc_protos {
 148         const char *netid;
 149         int af;
 150         int sotype;
 151 } nc_protos[] = {
 152         {"udp",         AF_INET,        SOCK_DGRAM},
 153         {"tcp",         AF_INET,        SOCK_STREAM},
 154         {"udp6",        AF_INET6,       SOCK_DGRAM},
 155         {"tcp6",        AF_INET6,       SOCK_STREAM},
 156         {NULL,          0,              0}
 157 };
 158
 159 struct nfhret {
 160         u_long          stat;
 161         long            vers;
 162         long            auth;
 163         long            fhsize;
 164         u_char          nfh[NFSX_V3FHMAX];
 165 };
 166 #define BGRND   1
 167 #define ISBGRND 2
 168 int retrycnt = -1;
 169 int opflags = 0;
 170 int nfsproto;
 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 = ALTF_TCP;
 283         nfsargs = nfsdefargs;
 284         nfsargsp = &nfsargs;
 285         if (altflags & ALTF_TCP) {
 286                 nfsproto = IPPROTO_TCP;
 287                 nfsargsp->sotype = SOCK_STREAM;
 288         } else {
 289                 nfsproto = IPPROTO_UDP;
 290                 nfsargsp->sotype = SOCK_DGRAM;
 291         }
 292         while ((c = getopt(argc, argv,
 293             "23a:bcdD:g:I:iKlm:No:PR:r:sTt:w:x:U")) != -1)
 294                 switch (c) {
 295                 case '2':
 296                         mountmode = V2;
 297                         break;
 298                 case '3':
 299                         mountmode = V3;
 300                         break;
 301                 case 'a':
 302                         num = strtol(optarg, &p, 10);
 303                         if (*p || num < 0)
 304                                 errx(1, "illegal -a value -- %s", optarg);
 305                         nfsargsp->readahead = num;
 306                         nfsargsp->flags |= NFSMNT_READAHEAD;
 307                         break;
 308                 case 'b':
 309                         opflags |= BGRND;
 310                         break;
 311                 case 'c':
 312                         nfsargsp->flags |= NFSMNT_NOCONN;
 313                         break;
 314                 case 'D':
 315                         num = strtol(optarg, &p, 10);
 316                         if (*p || num <= 0)
 317                                 errx(1, "illegal -D value -- %s", optarg);
 318                         nfsargsp->deadthresh = num;
 319                         nfsargsp->flags |= NFSMNT_DEADTHRESH;
 320                         break;
 321                 case 'd':
 322                         nfsargsp->flags |= NFSMNT_DUMBTIMR;
 323                         break;
 324 #if 0 /* XXXX */
 325                 case 'g':
 326                         num = strtol(optarg, &p, 10);
 327                         if (*p || num <= 0)
 328                                 errx(1, "illegal -g value -- %s", optarg);
 329                         set_rpc_maxgrouplist(num);
 330                         nfsargsp->maxgrouplist = num;
 331                         nfsargsp->flags |= NFSMNT_MAXGRPS;
 332                         break;
 333 #endif
 334                 case 'I':
 335                         num = strtol(optarg, &p, 10);
 336                         if (*p || num <= 0)
 337                                 errx(1, "illegal -I value -- %s", optarg);
 338                         nfsargsp->readdirsize = num;
 339                         nfsargsp->flags |= NFSMNT_READDIRSIZE;
 340                         break;
 341                 case 'i':
 342                         nfsargsp->flags |= NFSMNT_INT;
 343                         break;
 344 #ifdef NFSKERB
 345                 case 'K':
 346                         nfsargsp->flags |= NFSMNT_KERB;
 347                         break;
 348 #endif
 349                 case 'l':
 350                         nfsargsp->flags |= NFSMNT_RDIRPLUS;
 351                         break;
 352 #ifdef NFSKERB
 353                 case 'm':
 354                         strncpy(realm, optarg, REALM_SZ - 1);
 355                         realm[REALM_SZ - 1] = '\0';
 356                         break;
 357 #endif
 358                 case 'N':
 359                         nfsargsp->flags &= ~NFSMNT_RESVPORT;
 360                         break;
 361                 case 'o':
 362                         altflags = 0;
 363                         set_flags(&altflags, &nfsargsp->flags, TRUE);
 364                         if (nfsproto == IPPROTO_TCP)
 365                                 altflags |= ALTF_TCP;
 366                         if (mountmode == V2)
 367                                 altflags |= ALTF_NFSV2;
 368                         else if (mountmode == V3)
 369                                 altflags |= ALTF_NFSV3;
 370                         getmntopts(optarg, mopts, &mntflags, &altflags);
 371                         set_flags(&altflags, &nfsargsp->flags, FALSE);
 372                         /*
 373                          * Handle altflags which don't map directly to
 374                          * mount flags.
 375                          */
 376                         if(altflags & ALTF_BG)
 377                                 opflags |= BGRND;
 378                         if (altflags & ALTF_TCP) {
 379                                 nfsproto = IPPROTO_TCP;
 380                                 nfsargsp->sotype = SOCK_STREAM;
 381                         } else {
 382                                 nfsproto = IPPROTO_UDP;
 383                                 nfsargsp->sotype = SOCK_DGRAM;
 384                         }
 385                         if(altflags & ALTF_PORT) {
 386                                 /*
 387                                  * XXX Converting from a string to an int
 388                                  * and back again is silly, and we should
 389                                  * allow /etc/services names.
 390                                  */
 391                                 asprintf(&portspec, "%d",
 392                                          atoi(strstr(optarg, "port=") + 5));
 393                                 if (portspec == NULL)
 394                                         err(1, "asprintf");
 395                         }
 396                         mountmode = ANY;
 397                         if(altflags & ALTF_NFSV2)
 398                                 mountmode = V2;
 399                         if(altflags & ALTF_NFSV3)
 400                                 mountmode = V3;
 401                         if(altflags & ALTF_ACREGMIN)
 402                                 nfsargsp->acregmin = atoi(strstr(optarg,
 403                                     "acregmin=") + 9);
 404                         if(altflags & ALTF_ACREGMAX)
 405                                 nfsargsp->acregmax = atoi(strstr(optarg,
 406                                     "acregmax=") + 9);
 407                         if(altflags & ALTF_ACDIRMIN)
 408                                 nfsargsp->acdirmin = atoi(strstr(optarg,
 409                                     "acdirmin=") + 9);
 410                         if(altflags & ALTF_ACDIRMAX)
 411                                 nfsargsp->acdirmax = atoi(strstr(optarg,
 412                                     "acdirmax=") + 9);
 413                         break;
 414                 case 'P':
 415                         /* obsolete for NFSMNT_RESVPORT, now default */
 416                         break;
 417                 case 'R':
 418                         num = strtol(optarg, &p, 10);
 419                         if (*p || num < 0)
 420                                 errx(1, "illegal -R value -- %s", optarg);
 421                         retrycnt = num;
 422                         break;
 423                 case 'r':
 424                         num = strtol(optarg, &p, 10);
 425                         if (*p || num <= 0)
 426                                 errx(1, "illegal -r value -- %s", optarg);
 427                         nfsargsp->rsize = num;
 428                         nfsargsp->flags |= NFSMNT_RSIZE;
 429                         break;
 430                 case 's':
 431                         nfsargsp->flags |= NFSMNT_SOFT;
 432                         break;
 433                 case 'T':
 434                         nfsargsp->sotype = SOCK_STREAM;
 435                         nfsproto = IPPROTO_TCP;
 436                         altflags |= ALTF_TCP;
 437                         break;
 438                 case 't':
 439                         num = strtol(optarg, &p, 10);
 440                         if (*p || num <= 0)
 441                                 errx(1, "illegal -t value -- %s", optarg);
 442                         nfsargsp->timeo = num;
 443                         nfsargsp->flags |= NFSMNT_TIMEO;
 444                         break;
 445                 case 'w':
 446                         num = strtol(optarg, &p, 10);
 447                         if (*p || num <= 0)
 448                                 errx(1, "illegal -w value -- %s", optarg);
 449                         nfsargsp->wsize = num;
 450                         nfsargsp->flags |= NFSMNT_WSIZE;
 451                         break;
 452                 case 'x':
 453                         num = strtol(optarg, &p, 10);
 454                         if (*p || num <= 0)
 455                                 errx(1, "illegal -x value -- %s", optarg);
 456                         nfsargsp->retrans = num;
 457                         nfsargsp->flags |= NFSMNT_RETRANS;
 458                         break;
 459                 case 'U':
 460                         nfsargsp->sotype = SOCK_DGRAM;
 461                         nfsproto = IPPROTO_UDP;
 462                         altflags &= ~ALTF_TCP;
 463                         break;
 464                 default:
 465                         usage();
 466                         break;
 467                 }
 468         argc -= optind;
 469         argv += optind;
 470
 471         if (argc != 2) {
 472                 usage();
 473                 /* NOTREACHED */
 474         }
 475
 476         spec = *argv++;
 477         name = *argv;
 478
 479         if (retrycnt == -1)
 480                 /* The default is to keep retrying forever. */
 481                 retrycnt = 0;
 482         if (!getnfsargs(spec, nfsargsp))
 483                 exit(1);
 484
 485         /* resolve the mountpoint with realpath(3) */
 486         checkpath(name, mntpath);
 487
 488         error = getvfsbyname("nfs", &vfc);
 489         if (error && vfsisloadable("nfs")) {
 490                 if(vfsload("nfs"))
 491                         err(EX_OSERR, "vfsload(nfs)");
 492                 endvfsent();    /* clear cache */
 493                 error = getvfsbyname("nfs", &vfc);
 494         }
 495         if (error)
 496                 errx(EX_OSERR, "nfs filesystem is not available");
 497
 498         if (mount(vfc.vfc_name, mntpath, mntflags, nfsargsp))
 499                 err(1, "%s", mntpath);
 500         if (nfsargsp->flags & NFSMNT_KERB) {
 501                 if ((opflags & ISBGRND) == 0) {
 502                         if (daemon(0, 0) != 0)
 503                                 err(1, "daemon");
 504                 }
 505                 openlog("mount_nfs", LOG_PID, LOG_DAEMON);
 506                 nfssvc_flag = NFSSVC_MNTD;
 507                 ncd.ncd_dirp = mntpath;
 508                 while (nfssvc(nfssvc_flag, (caddr_t)&ncd) < 0) {
 509                         if (errno != ENEEDAUTH) {
 510                                 syslog(LOG_ERR, "nfssvc err %m");
 511                                 continue;
 512                         }
 513                         nfssvc_flag =
 514                             NFSSVC_MNTD | NFSSVC_GOTAUTH | NFSSVC_AUTHINFAIL;
 515 #ifdef NFSKERB
 516                         /*
 517                          * Set up as ncd_authuid for the kerberos call.
 518                          * Must set ruid to ncd_authuid and reset the
 519                          * ticket name iff ncd_authuid is not the same
 520                          * as last time, so that the right ticket file
 521                          * is found.
 522                          * Get the Kerberos credential structure so that
 523                          * we have the session key and get a ticket for
 524                          * this uid.
 525                          * For more info see the IETF Draft "Authentication
 526                          * in ONC RPC".
 527                          */
 528                         if (ncd.ncd_authuid != last_ruid) {
 529                                 char buf[512];
 530                                 sprintf(buf, "%s%d", TKT_ROOT, ncd.ncd_authuid);
 531                                 krb_set_tkt_string(buf);
 532                                 last_ruid = ncd.ncd_authuid;
 533                         }
 534                         setreuid(ncd.ncd_authuid, 0);
 535                         kret = krb_get_cred(NFS_KERBSRV, inst, realm, &kcr);
 536                         if (kret == RET_NOTKT) {
 537                             kret = get_ad_tkt(NFS_KERBSRV, inst, realm,
 538                                 DEFAULT_TKT_LIFE);
 539                             if (kret == KSUCCESS)
 540                                 kret = krb_get_cred(NFS_KERBSRV, inst, realm,
 541                                     &kcr);
 542                         }
 543                         if (kret == KSUCCESS)
 544                             kret = krb_mk_req(&ktick.kt, NFS_KERBSRV, inst,
 545                                 realm, 0);
 546
 547                         /*
 548                          * Fill in the AKN_FULLNAME authenticator and verifier.
 549                          * Along with the Kerberos ticket, we need to build
 550                          * the timestamp verifier and encrypt it in CBC mode.
 551                          */
 552                         if (kret == KSUCCESS &&
 553                             ktick.kt.length <= (RPCAUTH_MAXSIZ-3*NFSX_UNSIGNED)
 554                             && gettimeofday(&ktv, NULL) == 0) {
 555                             ncd.ncd_authtype = RPCAUTH_KERB4;
 556                             ncd.ncd_authstr = (u_char *)&ktick;
 557                             ncd.ncd_authlen = nfsm_rndup(ktick.kt.length) +
 558                                 3 * NFSX_UNSIGNED;
 559                             ncd.ncd_verfstr = (u_char *)&kverf;
 560                             ncd.ncd_verflen = sizeof (kverf);
 561                             memmove(ncd.ncd_key, kcr.session,
 562                                 sizeof (kcr.session));
 563                             kin.t1 = htonl(ktv.tv_sec);
 564                             kin.t2 = htonl(ktv.tv_usec);
 565                             kin.w1 = htonl(NFS_KERBTTL);
 566                             kin.w2 = htonl(NFS_KERBTTL - 1);
 567                             bzero((caddr_t)kivec, sizeof (kivec));
 568
 569                             /*
 570                              * Encrypt kin in CBC mode using the session
 571                              * key in kcr.
 572                              */
 573                             XXX
 574
 575                             /*
 576                              * Finally, fill the timestamp verifier into the
 577                              * authenticator and verifier.
 578                              */
 579                             ktick.kind = htonl(RPCAKN_FULLNAME);
 580                             kverf.kind = htonl(RPCAKN_FULLNAME);
 581                             NFS_KERBW1(ktick.kt) = kout.w1;
 582                             ktick.kt.length = htonl(ktick.kt.length);
 583                             kverf.verf.t1 = kout.t1;
 584                             kverf.verf.t2 = kout.t2;
 585                             kverf.verf.w2 = kout.w2;
 586                             nfssvc_flag = NFSSVC_MNTD | NFSSVC_GOTAUTH;
 587                         }
 588                         setreuid(0, 0);
 589 #endif /* NFSKERB */
 590                 }
 591         }
 592         exit(0);
 593 }
 594
 595 static int
 596 getnfsargs(char *spec, struct nfs_args *nfsargsp)
 597 {
 598         struct addrinfo hints, *ai_nfs, *ai;
 599 #ifdef NFSKERB
 600         char host[NI_MAXHOST], serv[NI_MAXSERV];
 601 #endif
 602         enum tryret ret;
 603         int ecode, speclen, remoteerr;
 604         char *hostp, *delimp, *errstr;
 605 #ifdef NFSKERB
 606         char *cp;
 607 #endif
 608         size_t len;
 609         static char nam[MNAMELEN + 1];
 610
 611         if ((delimp = strrchr(spec, ':')) != NULL) {
 612                 hostp = spec;
 613                 spec = delimp + 1;
 614         } else if ((delimp = strrchr(spec, '@')) != NULL) {
 615                 warnx("path@server syntax is deprecated, use server:path");
 616                 hostp = delimp + 1;
 617         } else {
 618                 warnx("no <host>:<dirpath> nfs-name");
 619                 return (0);
 620         }
 621         *delimp = '\0';
 622
 623         /*
 624          * If there has been a trailing slash at mounttime it seems
 625          * that some mountd implementations fail to remove the mount
 626          * entries from their mountlist while unmounting.
 627          */
 628         for (speclen = strlen(spec);
 629                 speclen > 1 && spec[speclen - 1] == '/';
 630                 speclen--)
 631                 spec[speclen - 1] = '\0';
 632         if (strlen(hostp) + strlen(spec) + 1 > MNAMELEN) {
 633                 warnx("%s:%s: %s", hostp, spec, strerror(ENAMETOOLONG));
 634                 return (0);
 635         }
 636         /* Make both '@' and ':' notations equal */
 637         if (*hostp != '\0') {
 638                 len = strlen(hostp);
 639                 memmove(nam, hostp, len);
 640                 nam[len] = ':';
 641                 memmove(nam + len + 1, spec, speclen);
 642                 nam[len + speclen + 1] = '\0';
 643         }
 644
 645         /*
 646          * Handle an internet host address and reverse resolve it if
 647          * doing Kerberos.
 648          */
 649         memset(&hints, 0, sizeof hints);
 650         hints.ai_flags = AI_NUMERICHOST;
 651         hints.ai_socktype = nfsargsp->sotype;
 652         if (getaddrinfo(hostp, portspec, &hints, &ai_nfs) == 0) {
 653 #ifdef NFSKERB
 654                 if ((nfsargsp->flags & NFSMNT_KERB)) {
 655                         hints.ai_flags = 0;
 656                         if (getnameinfo(ai_nfs->ai_addr, ai_nfs->ai_addrlen,
 657                             host, sizeof host, serv, sizeof serv, 0) != 0) {
 658                                 warnx("can't reverse resolve net address");
 659                                         return (0);
 660                                 }
 661                         hostp = host;
 662                 }
 663 #endif /* NFSKERB */
 664         } else {
 665                 hints.ai_flags = 0;
 666                 if ((ecode = getaddrinfo(hostp, portspec, &hints, &ai_nfs))
 667                     != 0) {
 668                         if (portspec == NULL)
 669                                 errx(1, "%s: %s", hostp, gai_strerror(ecode));
 670                         else
 671                                 errx(1, "%s:%s: %s", hostp, portspec,
 672                                     gai_strerror(ecode));
 673                         return (0);
 674                 }
 675         }
 676 #ifdef NFSKERB
 677         if (nfsargsp->flags & NFSMNT_KERB) {
 678                 strncpy(inst, hp->h_name, INST_SZ);
 679                 inst[INST_SZ - 1] = '\0';
 680                 if (cp = strchr(inst, '.'))
 681                         *cp = '\0';
 682         }
 683 #endif /* NFSKERB */
 684
 685         ret = TRYRET_LOCALERR;
 686         for (;;) {
 687                 /*
 688                  * Try each entry returned by getaddrinfo(). Note the
 689                  * occurence of remote errors by setting `remoteerr'.
 690                  */
 691                 remoteerr = 0;
 692                 for (ai = ai_nfs; ai != NULL; ai = ai->ai_next) {
 693                         ret = nfs_tryproto(nfsargsp, ai, hostp, spec, &errstr);
 694                         if (ret == TRYRET_SUCCESS)
 695                                 break;
 696                         if (ret != TRYRET_LOCALERR)
 697                                 remoteerr = 1;
 698                         if ((opflags & ISBGRND) == 0)
 699                                 fprintf(stderr, "%s\n", errstr);
 700                 }
 701                 if (ret == TRYRET_SUCCESS)
 702                         break;
 703
 704                 /* Exit if all errors were local. */
 705                 if (!remoteerr)
 706                         exit(1);
 707
 708                 /*
 709                  * If retrycnt == 0, we are to keep retrying forever.
 710                  * Otherwise decrement it, and exit if it hits zero.
 711                  */
 712                 if (retrycnt != 0 && --retrycnt == 0)
 713                         exit(1);
 714
 715                 if ((opflags & (BGRND | ISBGRND)) == BGRND) {
 716                         warnx("Cannot immediately mount %s:%s, backgrounding",
 717                             hostp, spec);
 718                         opflags |= ISBGRND;
 719                         if (daemon(0, 0) != 0)
 720                                 err(1, "daemon");
 721                 }
 722                 sleep(60);
 723         }
 724         freeaddrinfo(ai_nfs);
 725         nfsargsp->hostname = nam;
 726         /* Add mounted filesystem to PATH_MOUNTTAB */
 727         if (!add_mtab(hostp, spec))
 728                 warnx("can't update %s for %s:%s", PATH_MOUNTTAB, hostp, spec);
 729         return (1);
 730 }
 731
 732 /*
 733  * Try to set up the NFS arguments according to the address
 734  * family, protocol (and possibly port) specified in `ai'.
 735  *
 736  * Returns TRYRET_SUCCESS if successful, or:
 737  *   TRYRET_TIMEOUT             The server did not respond.
 738  *   TRYRET_REMOTEERR           The server reported an error.
 739  *   TRYRET_LOCALERR            Local failure.
 740  *
 741  * In all error cases, *errstr will be set to a statically-allocated string
 742  * describing the error.
 743  */
 744 static enum tryret
 745 nfs_tryproto(struct nfs_args *nfsargsp, struct addrinfo *ai, char *hostp,
 746     char *spec, char **errstr)
 747 {
 748         static char errbuf[256];
 749         struct sockaddr_storage nfs_ss;
 750         struct netbuf nfs_nb;
 751         struct nfhret nfhret;
 752         struct timeval try;
 753         struct rpc_err rpcerr;
 754         CLIENT *clp;
 755         struct netconfig *nconf, *nconf_mnt;
 756         const char *netid, *netid_mnt;
 757         int doconnect, nfsvers, mntvers;
 758         enum clnt_stat status;
 759         enum mountmode trymntmode;
 760
 761         trymntmode = mountmode;
 762         errbuf[0] = '\0';
 763         *errstr = errbuf;
 764
 765         if ((netid = netidbytype(ai->ai_family, nfsargsp->sotype)) == NULL) {
 766                 snprintf(errbuf, sizeof errbuf,
 767                     "af %d sotype %d not supported", ai->ai_family,
 768                     nfsargsp->sotype);
 769                 return (TRYRET_LOCALERR);
 770         }
 771         if ((nconf = getnetconf_cached(netid)) == NULL) {
 772                 snprintf(errbuf, sizeof errbuf, "%s: %s", netid, nc_sperror());
 773                 return (TRYRET_LOCALERR);
 774         }
 775
 776         netid_mnt = netid;
 777         nconf_mnt = nconf;
 778
 779 tryagain:
 780         if (trymntmode == V2) {
 781                 nfsvers = 2;
 782                 mntvers = 1;
 783         } else {
 784                 nfsvers = 3;
 785                 mntvers = 3;
 786         }
 787
 788         if (portspec != NULL) {
 789                 /* `ai' contains the complete nfsd sockaddr. */
 790                 nfs_nb.buf = ai->ai_addr;
 791                 nfs_nb.len = nfs_nb.maxlen = ai->ai_addrlen;
 792         } else {
 793                 /* Ask the remote rpcbind. */
 794                 nfs_nb.buf = &nfs_ss;
 795                 nfs_nb.len = nfs_nb.maxlen = sizeof nfs_ss;
 796
 797                 if (!rpcb_getaddr(RPCPROG_NFS, nfsvers, nconf, &nfs_nb,
 798                     hostp)) {
 799                         if (rpc_createerr.cf_stat == RPC_PROGVERSMISMATCH &&
 800                             trymntmode == ANY) {
 801                                 trymntmode = V2;
 802                                 goto tryagain;
 803                         }
 804                         snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s",
 805                             netid, hostp, spec,
 806                             clnt_spcreateerror("RPCPROG_NFS"));
 807                         return (returncode(rpc_createerr.cf_stat,
 808                             &rpc_createerr.cf_error));
 809                 }
 810         }
 811
 812         /* Check that the server (nfsd) responds on the port we have chosen. */
 813         clp = clnt_tli_create(RPC_ANYFD, nconf, &nfs_nb, RPCPROG_NFS, nfsvers,
 814             0, 0);
 815         if (clp == NULL) {
 816                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
 817                     hostp, spec, clnt_spcreateerror("nfsd: RPCPROG_NFS"));
 818                 return (returncode(rpc_createerr.cf_stat,
 819                     &rpc_createerr.cf_error));
 820         }
 821         if (nfsargsp->sotype == SOCK_DGRAM &&
 822             !(nfsargsp->flags & NFSMNT_NOCONN)) {
 823                 /*
 824                  * Use connect(), to match what the kernel does. This
 825                  * catches cases where the server responds from the
 826                  * wrong source address.
 827                  */
 828                 doconnect = 1;
 829                 if (!clnt_control(clp, CLSET_CONNECT, (char *)&doconnect)) {
 830                         clnt_destroy(clp);
 831                         snprintf(errbuf, sizeof errbuf,
 832                             "[%s] %s:%s: CLSET_CONNECT failed", netid, hostp,
 833                             spec);
 834                         return (TRYRET_LOCALERR);
 835                 }
 836         }
 837
 838         try.tv_sec = 10;
 839         try.tv_usec = 0;
 840         status = clnt_call(clp, NFSPROC_NULL, (xdrproc_t)xdr_void, NULL,
 841             (xdrproc_t)xdr_void, NULL, try);
 842         if (status != RPC_SUCCESS) {
 843                 if (status == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
 844                         clnt_destroy(clp);
 845                         trymntmode = V2;
 846                         goto tryagain;
 847                 }
 848                 clnt_geterr(clp, &rpcerr);
 849                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
 850                     hostp, spec, clnt_sperror(clp, "NFSPROC_NULL"));
 851                 clnt_destroy(clp);
 852                 return (returncode(status, &rpcerr));
 853         }
 854         clnt_destroy(clp);
 855
 856         /* Send the RPCMNT_MOUNT RPC to get the root filehandle. */
 857         try.tv_sec = 10;
 858         try.tv_usec = 0;
 859         clp = clnt_tp_create(hostp, RPCPROG_MNT, mntvers, nconf_mnt);
 860         if (clp == NULL) {
 861                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
 862                     hostp, spec, clnt_spcreateerror("RPCMNT: clnt_create"));
 863                 return (returncode(rpc_createerr.cf_stat,
 864                     &rpc_createerr.cf_error));
 865         }
 866         clp->cl_auth = authsys_create_default();
 867         if (nfsargsp->flags & NFSMNT_KERB)
 868                 nfhret.auth = RPCAUTH_KERB4;
 869         else
 870                 nfhret.auth = RPCAUTH_UNIX;
 871         nfhret.vers = mntvers;
 872         status = clnt_call(clp, RPCMNT_MOUNT, (xdrproc_t)xdr_dir, spec,
 873             (xdrproc_t)xdr_fh, &nfhret, try);
 874         auth_destroy(clp->cl_auth);
 875         if (status != RPC_SUCCESS) {
 876                 if (status == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
 877                         clnt_destroy(clp);
 878                         trymntmode = V2;
 879                         goto tryagain;
 880                 }
 881                 clnt_geterr(clp, &rpcerr);
 882                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
 883                     hostp, spec, clnt_sperror(clp, "RPCPROG_MNT"));
 884                 clnt_destroy(clp);
 885                 return (returncode(status, &rpcerr));
 886         }
 887         clnt_destroy(clp);
 888
 889         if (nfhret.stat != 0) {
 890                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
 891                     hostp, spec, strerror(nfhret.stat));
 892                 return (TRYRET_REMOTEERR);
 893         }
 894
 895         /*
 896          * Store the filehandle and server address in nfsargsp, making
 897          * sure to copy any locally allocated structures.
 898          */
 899         nfsargsp->addrlen = nfs_nb.len;
 900         nfsargsp->addr = malloc(nfsargsp->addrlen);
 901         nfsargsp->fhsize = nfhret.fhsize;
 902         nfsargsp->fh = malloc(nfsargsp->fhsize);
 903         if (nfsargsp->addr == NULL || nfsargsp->fh == NULL)
 904                 err(1, "malloc");
 905         bcopy(nfs_nb.buf, nfsargsp->addr, nfsargsp->addrlen);
 906         bcopy(nfhret.nfh, nfsargsp->fh, nfsargsp->fhsize);
 907
 908         if (nfsvers == 3)
 909                 nfsargsp->flags |= NFSMNT_NFSV3;
 910         else
 911                 nfsargsp->flags &= ~NFSMNT_NFSV3;
 912
 913         return (TRYRET_SUCCESS);
 914 }
 915
 916
 917 /*
 918  * Catagorise a RPC return status and error into an `enum tryret'
 919  * return code.
 920  */
 921 static enum tryret
 922 returncode(enum clnt_stat status, struct rpc_err *rpcerr)
 923 {
 924         switch (status) {
 925         case RPC_TIMEDOUT:
 926                 return (TRYRET_TIMEOUT);
 927         case RPC_PMAPFAILURE:
 928         case RPC_PROGNOTREGISTERED:
 929         case RPC_PROGVERSMISMATCH:
 930         /* XXX, these can be local or remote. */
 931         case RPC_CANTSEND:
 932         case RPC_CANTRECV:
 933                 return (TRYRET_REMOTEERR);
 934         case RPC_SYSTEMERROR:
 935                 switch (rpcerr->re_errno) {
 936                 case ETIMEDOUT:
 937                         return (TRYRET_TIMEOUT);
 938                 case ENOMEM:
 939                         break;
 940                 default:
 941                         return (TRYRET_REMOTEERR);
 942                 }
 943                 /* FALLTHROUGH */
 944         default:
 945                 break;
 946         }
 947         return (TRYRET_LOCALERR);
 948 }
 949
 950 /*
 951  * Look up a netid based on an address family and socket type.
 952  * `af' is the address family, and `sotype' is SOCK_DGRAM or SOCK_STREAM.
 953  *
 954  * XXX there should be a library function for this.
 955  */
 956 static const char *
 957 netidbytype(int af, int sotype)
 958 {
 959         struct nc_protos *p;
 960
 961         for (p = nc_protos; p->netid != NULL; p++) {
 962                 if (af != p->af || sotype != p->sotype)
 963                         continue;
 964                 return (p->netid);
 965         }
 966         return (NULL);
 967 }
 968
 969 /*
 970  * Look up a netconfig entry based on a netid, and cache the result so
 971  * that we don't need to remember to call freenetconfigent().
 972  *
 973  * Otherwise it behaves just like getnetconfigent(), so nc_*error()
 974  * work on failure.
 975  */
 976 static struct netconfig *
 977 getnetconf_cached(const char *netid)
 978 {
 979         static struct nc_entry {
 980                 struct netconfig *nconf;
 981                 struct nc_entry *next;
 982         } *head;
 983         struct nc_entry *p;
 984         struct netconfig *nconf;
 985
 986         for (p = head; p != NULL; p = p->next)
 987                 if (strcmp(netid, p->nconf->nc_netid) == 0)
 988                         return (p->nconf);
 989
 990         if ((nconf = getnetconfigent(netid)) == NULL)
 991                 return (NULL);
 992         if ((p = malloc(sizeof(*p))) == NULL)
 993                 err(1, "malloc");
 994         p->nconf = nconf;
 995         p->next = head;
 996         head = p;
 997
 998         return (p->nconf);
 999 }
1000
1001 /*
1002  * xdr routines for mount rpc's
1003  */
1004 static int
1005 xdr_dir(XDR *xdrsp, char *dirp)
1006 {
1007         return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
1008 }
1009
1010 static int
1011 xdr_fh(XDR *xdrsp, struct nfhret *np)
1012 {
1013         int i;
1014         long auth, authcnt, authfnd = 0;
1015
1016         if (!xdr_u_long(xdrsp, &np->stat))
1017                 return (0);
1018         if (np->stat)
1019                 return (1);
1020         switch (np->vers) {
1021         case 1:
1022                 np->fhsize = NFSX_V2FH;
1023                 return (xdr_opaque(xdrsp, (caddr_t)np->nfh, NFSX_V2FH));
1024         case 3:
1025                 if (!xdr_long(xdrsp, &np->fhsize))
1026                         return (0);
1027                 if (np->fhsize <= 0 || np->fhsize > NFSX_V3FHMAX)
1028                         return (0);
1029                 if (!xdr_opaque(xdrsp, (caddr_t)np->nfh, np->fhsize))
1030                         return (0);
1031                 if (!xdr_long(xdrsp, &authcnt))
1032                         return (0);
1033                 for (i = 0; i < authcnt; i++) {
1034                         if (!xdr_long(xdrsp, &auth))
1035                                 return (0);
1036                         if (auth == np->auth)
1037                                 authfnd++;
1038                 }
1039                 /*
1040                  * Some servers, such as DEC's OSF/1 return a nil authenticator
1041                  * list to indicate RPCAUTH_UNIX.
1042                  */
1043                 if (!authfnd && (authcnt > 0 || np->auth != RPCAUTH_UNIX))
1044                         np->stat = EAUTH;
1045                 return (1);
1046         };
1047         return (0);
1048 }
1049
1050 static void
1051 usage(void)
1052 {
1053         fprintf(stderr, "%s\n%s\n%s\n%s\n",
1054 "usage: mount_nfs [-23KNPTUbcdils] [-D deadthresh] [-I readdirsize]",
1055 "                 [-R retrycnt] [-a maxreadahead]",
1056 "                 [-g maxgroups] [-m realm] [-o options] [-r readsize]",
1057 "                 [-t timeout] [-w writesize] [-x retrans] rhost:path node");
1058         exit(1);
1059 }