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/stat.h>
  45 #include <sys/syslog.h>
  46
  47 #include <rpc/rpc.h>
  48 #include <rpc/pmap_clnt.h>
  49 #include <rpc/pmap_prot.h>
  50
  51 #include <vfs/nfs/rpcv2.h>
  52 #include <vfs/nfs/nfsproto.h>
  53 #include <vfs/nfs/nfs.h>
  54
  55 #include <arpa/inet.h>
  56
  57 #include <ctype.h>
  58 #include <err.h>
  59 #include <errno.h>
  60 #include <netdb.h>
  61 #include <stdio.h>
  62 #include <stdlib.h>
  63 #include <strings.h>
  64 #include <sysexits.h>
  65 #include <unistd.h>
  66 #include <resolv.h>
  67
  68 #include "mntopts.h"
  69 #include "mounttab.h"
  70
  71 #define ALTF_BG         0x1
  72 #define ALTF_NOCONN     0x2
  73 #define ALTF_DUMBTIMR   0x4
  74 #define ALTF_INTR       0x8
  75 #define ALTF_KERB       0x10
  76 #define ALTF_NFSV3      0x20
  77 #define ALTF_RDIRPLUS   0x40
  78 #define ALTF_MNTUDP     0x80
  79 #define ALTF_RESVPORT   0x100
  80 #define ALTF_SEQPACKET  0x200
  81 #define ALTF_UNUSED400  0x400
  82 #define ALTF_SOFT       0x800
  83 #define ALTF_TCP        0x1000
  84 #define ALTF_PORT       0x2000
  85 #define ALTF_NFSV2      0x4000
  86 #define ALTF_ACREGMIN   0x8000
  87 #define ALTF_ACREGMAX   0x10000
  88 #define ALTF_ACDIRMIN   0x20000
  89 #define ALTF_ACDIRMAX   0x40000
  90
  91 struct mntopt mopts[] = {
  92         MOPT_STDOPTS,
  93         MOPT_FORCE,
  94         MOPT_UPDATE,
  95         MOPT_ASYNC,
  96         { "bg", 0, ALTF_BG, 1 },
  97         { "conn", 1, ALTF_NOCONN, 1 },
  98         { "dumbtimer", 0, ALTF_DUMBTIMR, 1 },
  99         { "intr", 0, ALTF_INTR, 1 },
 100 #ifdef NFSKERB
 101         { "kerb", 0, ALTF_KERB, 1 },
 102 #endif
 103         { "nfsv3", 0, ALTF_NFSV3, 1 },
 104         { "rdirplus", 0, ALTF_RDIRPLUS, 1 },
 105         { "mntudp", 0, ALTF_MNTUDP, 1 },
 106         { "resvport", 0, ALTF_RESVPORT, 1 },
 107         { "soft", 0, ALTF_SOFT, 1 },
 108         { "tcp", 0, ALTF_TCP, 1 },
 109         { "port=", 0, ALTF_PORT, 1 },
 110         { "nfsv2", 0, ALTF_NFSV2, 1 },
 111         { "acregmin=", 0, ALTF_ACREGMIN, 1 },
 112         { "acregmax=", 0, ALTF_ACREGMAX, 1 },
 113         { "acdirmin=", 0, ALTF_ACDIRMIN, 1 },
 114         { "acdirmax=", 0, ALTF_ACDIRMAX, 1 },
 115         MOPT_NULL
 116 };
 117
 118 struct nfs_args nfsdefargs = {
 119         NFS_ARGSVERSION,
 120         (struct sockaddr *)0,
 121         sizeof (struct sockaddr_in),
 122         SOCK_DGRAM,
 123         0,
 124         (u_char *)0,
 125         0,
 126         NFSMNT_RESVPORT,
 127         NFS_WSIZE,
 128         NFS_RSIZE,
 129         NFS_READDIRSIZE,
 130         10,
 131         NFS_RETRANS,
 132         NFS_MAXGRPS,
 133         NFS_DEFRAHEAD,
 134         0,
 135         NFS_DEADTHRESH,
 136         (char *)0,
 137         /* args version 4 */
 138         NFS_MINATTRTIMO,
 139         NFS_MAXATTRTIMO,
 140         NFS_MINDIRATTRTIMO,
 141         NFS_MAXDIRATTRTIMO,
 142 };
 143
 144 struct nfhret {
 145         u_long          stat;
 146         long            vers;
 147         long            auth;
 148         long            fhsize;
 149         u_char          nfh[NFSX_V3FHMAX];
 150 };
 151
 152 #define BGRND   0x0001
 153 #define ISBGRND 0x0002
 154 #define DIDWARN 0x0004
 155
 156 int retrycnt = -1;
 157 int opflags = 0;
 158 int nfsproto = IPPROTO_UDP;
 159 int mnttcp_ok = 1;
 160 u_short port_no = 0;
 161 enum mountmode {
 162         ANY,
 163         V2,
 164         V3
 165 } mountmode = ANY;
 166
 167 #ifdef NFSKERB
 168 char inst[INST_SZ];
 169 char realm[REALM_SZ];
 170 struct {
 171         u_long          kind;
 172         KTEXT_ST        kt;
 173 } ktick;
 174 struct nfsrpc_nickverf kverf;
 175 struct nfsrpc_fullblock kin, kout;
 176 NFSKERBKEY_T kivec;
 177 CREDENTIALS kcr;
 178 struct timeval ktv;
 179 NFSKERBKEYSCHED_T kerb_keysched;
 180 #endif
 181
 182 /* Return codes for nfs_tryproto. */
 183 enum tryret {
 184         TRYRET_SUCCESS,
 185         TRYRET_TIMEOUT,         /* No response received. */
 186         TRYRET_REMOTEERR,       /* Error received from remote server. */
 187         TRYRET_LOCALERR         /* Local failure. */
 188 };
 189
 190 void    set_rpc_maxgrouplist(int);
 191
 192 static int      getnfsargs(char *, struct nfs_args *);
 193 static void     usage(void) __dead2;
 194 static int      xdr_dir(XDR *, char *);
 195 static int      xdr_fh(XDR *, struct nfhret *);
 196 static enum tryret
 197                 nfs_tryproto(struct nfs_args *, struct sockaddr_in *,
 198                              char *, char *, char **);
 199 static enum tryret
 200                 returncode(enum clnt_stat, struct rpc_err *);
 201
 202 /*
 203  * Used to set mount flags with getmntopts.  Call with dir=TRUE to
 204  * initialize altflags from the current mount flags.  Call with
 205  * dir=FALSE to update mount flags with the new value of altflags after
 206  * the call to getmntopts.
 207  */
 208 static void
 209 set_flags(int* altflags, int* nfsflags, int dir)
 210 {
 211 #define F2(af, nf)                                      \
 212         if (dir) {                                      \
 213                 if (*nfsflags & NFSMNT_##nf)            \
 214                         *altflags |= ALTF_##af;         \
 215                 else                                    \
 216                         *altflags &= ~ALTF_##af;        \
 217         } else {                                        \
 218                 if (*altflags & ALTF_##af)              \
 219                         *nfsflags |= NFSMNT_##nf;       \
 220                 else                                    \
 221                         *nfsflags &= ~NFSMNT_##nf;      \
 222         }
 223 #define F(f)    F2(f,f)
 224
 225         F(NOCONN);
 226         F(DUMBTIMR);
 227         F2(INTR, INT);
 228 #ifdef NFSKERB
 229         F(KERB);
 230 #endif
 231         F(RDIRPLUS);
 232         F(RESVPORT);
 233         F(SOFT);
 234         F(ACREGMIN);
 235         F(ACREGMAX);
 236         F(ACDIRMIN);
 237         F(ACDIRMAX);
 238
 239 #undef F
 240 #undef F2
 241 }
 242
 243 int
 244 main(int argc, char **argv)
 245 {
 246         int c;
 247         struct nfs_args *nfsargsp;
 248         struct nfs_args nfsargs;
 249         struct nfsd_cargs ncd;
 250         int mntflags, altflags, nfssvc_flag, num;
 251         char *name, *p, *spec;
 252         char mntpath[MAXPATHLEN];
 253         struct vfsconf vfc;
 254         int error = 0;
 255 #ifdef NFSKERB
 256         uid_t last_ruid;
 257
 258         last_ruid = -1;
 259         strcpy(realm, KRB_REALM);
 260         if (sizeof (struct nfsrpc_nickverf) != RPCX_NICKVERF ||
 261             sizeof (struct nfsrpc_fullblock) != RPCX_FULLBLOCK ||
 262             ((char *)&ktick.kt) - ((char *)&ktick) != NFSX_UNSIGNED ||
 263             ((char *)ktick.kt.dat) - ((char *)&ktick) != 2 * NFSX_UNSIGNED)
 264                 fprintf(stderr, "Yikes! NFSKERB structs not packed!!\n");
 265 #endif /* NFSKERB */
 266
 267         mntflags = 0;
 268         altflags = 0;
 269         nfsargs = nfsdefargs;
 270         nfsargsp = &nfsargs;
 271         while ((c = getopt(argc, argv,
 272             "23a:bcdD:g:I:iKlm:No:PR:r:sTt:w:x:U")) != -1)
 273                 switch (c) {
 274                 case '2':
 275                         mountmode = V2;
 276                         break;
 277                 case '3':
 278                         mountmode = V3;
 279                         break;
 280                 case 'a':
 281                         num = strtol(optarg, &p, 10);
 282                         if (*p || num < 0)
 283                                 errx(1, "illegal -a value -- %s", optarg);
 284                         nfsargsp->readahead = num;
 285                         nfsargsp->flags |= NFSMNT_READAHEAD;
 286                         break;
 287                 case 'b':
 288                         opflags |= BGRND;
 289                         break;
 290                 case 'c':
 291                         nfsargsp->flags |= NFSMNT_NOCONN;
 292                         break;
 293                 case 'D':
 294                         num = strtol(optarg, &p, 10);
 295                         if (*p || num <= 0)
 296                                 errx(1, "illegal -D value -- %s", optarg);
 297                         nfsargsp->deadthresh = num;
 298                         nfsargsp->flags |= NFSMNT_DEADTHRESH;
 299                         break;
 300                 case 'd':
 301                         nfsargsp->flags |= NFSMNT_DUMBTIMR;
 302                         break;
 303                 case 'g':
 304                         num = strtol(optarg, &p, 10);
 305                         if (*p || num <= 0)
 306                                 errx(1, "illegal -g value -- %s", optarg);
 307                         set_rpc_maxgrouplist(num);
 308                         nfsargsp->maxgrouplist = num;
 309                         nfsargsp->flags |= NFSMNT_MAXGRPS;
 310                         break;
 311                 case 'I':
 312                         num = strtol(optarg, &p, 10);
 313                         if (*p || num <= 0)
 314                                 errx(1, "illegal -I value -- %s", optarg);
 315                         nfsargsp->readdirsize = num;
 316                         nfsargsp->flags |= NFSMNT_READDIRSIZE;
 317                         break;
 318                 case 'i':
 319                         nfsargsp->flags |= NFSMNT_INT;
 320                         break;
 321 #ifdef NFSKERB
 322                 case 'K':
 323                         nfsargsp->flags |= NFSMNT_KERB;
 324                         break;
 325 #endif
 326                 case 'l':
 327                         nfsargsp->flags |= NFSMNT_RDIRPLUS;
 328                         break;
 329 #ifdef NFSKERB
 330                 case 'm':
 331                         strncpy(realm, optarg, REALM_SZ - 1);
 332                         realm[REALM_SZ - 1] = '\0';
 333                         break;
 334 #endif
 335                 case 'N':
 336                         nfsargsp->flags &= ~NFSMNT_RESVPORT;
 337                         break;
 338                 case 'o':
 339                         altflags = 0;
 340                         set_flags(&altflags, &nfsargsp->flags, TRUE);
 341                         if (mountmode == V2)
 342                                 altflags |= ALTF_NFSV2;
 343                         else if (mountmode == V3)
 344                                 altflags |= ALTF_NFSV3;
 345                         getmntopts(optarg, mopts, &mntflags, &altflags);
 346                         set_flags(&altflags, &nfsargsp->flags, FALSE);
 347                         /*
 348                          * Handle altflags which don't map directly to
 349                          * mount flags.
 350                          */
 351                         if(altflags & ALTF_BG)
 352                                 opflags |= BGRND;
 353                         if(altflags & ALTF_MNTUDP)
 354                                 mnttcp_ok = 0;
 355                         if(altflags & ALTF_TCP) {
 356                                 nfsargsp->sotype = SOCK_STREAM;
 357                                 nfsproto = IPPROTO_TCP;
 358                         }
 359                         if(altflags & ALTF_PORT)
 360                                 port_no = atoi(strstr(optarg, "port=") + 5);
 361                         mountmode = ANY;
 362                         if(altflags & ALTF_NFSV2)
 363                                 mountmode = V2;
 364                         if(altflags & ALTF_NFSV3)
 365                                 mountmode = V3;
 366                         if(altflags & ALTF_ACREGMIN)
 367                                 nfsargsp->acregmin = atoi(strstr(optarg,
 368                                     "acregmin=") + 9);
 369                         if(altflags & ALTF_ACREGMAX)
 370                                 nfsargsp->acregmax = atoi(strstr(optarg,
 371                                     "acregmax=") + 9);
 372                         if(altflags & ALTF_ACDIRMIN)
 373                                 nfsargsp->acdirmin = atoi(strstr(optarg,
 374                                     "acdirmin=") + 9);
 375                         if(altflags & ALTF_ACDIRMAX)
 376                                 nfsargsp->acdirmax = atoi(strstr(optarg,
 377                                     "acdirmax=") + 9);
 378                         break;
 379                 case 'P':
 380                         /* obsolete for NFSMNT_RESVPORT, now default */
 381                         break;
 382                 case 'R':
 383                         num = strtol(optarg, &p, 10);
 384                         if (*p || num < 0)
 385                                 errx(1, "illegal -R value -- %s", optarg);
 386                         retrycnt = num;
 387                         break;
 388                 case 'r':
 389                         num = strtol(optarg, &p, 10);
 390                         if (*p || num <= 0)
 391                                 errx(1, "illegal -r value -- %s", optarg);
 392                         nfsargsp->rsize = num;
 393                         nfsargsp->flags |= NFSMNT_RSIZE;
 394                         break;
 395                 case 's':
 396                         nfsargsp->flags |= NFSMNT_SOFT;
 397                         break;
 398                 case 'T':
 399                         nfsargsp->sotype = SOCK_STREAM;
 400                         nfsproto = IPPROTO_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                         mnttcp_ok = 0;
 425                         break;
 426                 default:
 427                         usage();
 428                         break;
 429                 }
 430         argc -= optind;
 431         argv += optind;
 432
 433         if (argc != 2) {
 434                 usage();
 435                 /* NOTREACHED */
 436         }
 437
 438         spec = *argv++;
 439         name = *argv;
 440
 441         if (retrycnt == -1)
 442                 /* The default is to keep retrying forever. */
 443                 retrycnt = 0;
 444         if (!getnfsargs(spec, nfsargsp))
 445                 exit(1);
 446
 447         /* resolve the mountpoint with realpath(3) */
 448         checkpath(name, mntpath);
 449
 450         error = getvfsbyname("nfs", &vfc);
 451         if (error && vfsisloadable("nfs")) {
 452                 if(vfsload("nfs"))
 453                         err(EX_OSERR, "vfsload(nfs)");
 454                 endvfsent();    /* clear cache */
 455                 error = getvfsbyname("nfs", &vfc);
 456         }
 457         if (error)
 458                 errx(EX_OSERR, "nfs filesystem is not available");
 459
 460         if (mount(vfc.vfc_name, mntpath, mntflags, nfsargsp))
 461                 err(1, "%s", mntpath);
 462         if (nfsargsp->flags & NFSMNT_KERB) {
 463                 if ((opflags & ISBGRND) == 0) {
 464                         if (daemon(0, 0) != 0)
 465                                 err(1, "daemon");
 466                 }
 467                 openlog("mount_nfs", LOG_PID, LOG_DAEMON);
 468                 nfssvc_flag = NFSSVC_MNTD;
 469                 ncd.ncd_dirp = mntpath;
 470                 while (nfssvc(nfssvc_flag, (caddr_t)&ncd) < 0) {
 471                         if (errno != ENEEDAUTH) {
 472                                 syslog(LOG_ERR, "nfssvc err %m");
 473                                 continue;
 474                         }
 475                         nfssvc_flag =
 476                             NFSSVC_MNTD | NFSSVC_GOTAUTH | NFSSVC_AUTHINFAIL;
 477 #ifdef NFSKERB
 478                         /*
 479                          * Set up as ncd_authuid for the kerberos call.
 480                          * Must set ruid to ncd_authuid and reset the
 481                          * ticket name iff ncd_authuid is not the same
 482                          * as last time, so that the right ticket file
 483                          * is found.
 484                          * Get the Kerberos credential structure so that
 485                          * we have the session key and get a ticket for
 486                          * this uid.
 487                          * For more info see the IETF Draft "Authentication
 488                          * in ONC RPC".
 489                          */
 490                         if (ncd.ncd_authuid != last_ruid) {
 491                                 char buf[512];
 492                                 sprintf(buf, "%s%d", TKT_ROOT, ncd.ncd_authuid);
 493                                 krb_set_tkt_string(buf);
 494                                 last_ruid = ncd.ncd_authuid;
 495                         }
 496                         setreuid(ncd.ncd_authuid, 0);
 497                         kret = krb_get_cred(NFS_KERBSRV, inst, realm, &kcr);
 498                         if (kret == RET_NOTKT) {
 499                             kret = get_ad_tkt(NFS_KERBSRV, inst, realm,
 500                                 DEFAULT_TKT_LIFE);
 501                             if (kret == KSUCCESS)
 502                                 kret = krb_get_cred(NFS_KERBSRV, inst, realm,
 503                                     &kcr);
 504                         }
 505                         if (kret == KSUCCESS)
 506                             kret = krb_mk_req(&ktick.kt, NFS_KERBSRV, inst,
 507                                 realm, 0);
 508
 509                         /*
 510                          * Fill in the AKN_FULLNAME authenticator and verifier.
 511                          * Along with the Kerberos ticket, we need to build
 512                          * the timestamp verifier and encrypt it in CBC mode.
 513                          */
 514                         if (kret == KSUCCESS &&
 515                             ktick.kt.length <= (RPCAUTH_MAXSIZ-3*NFSX_UNSIGNED)
 516                             && gettimeofday(&ktv, (struct timezone *)0) == 0) {
 517                             ncd.ncd_authtype = RPCAUTH_KERB4;
 518                             ncd.ncd_authstr = (u_char *)&ktick;
 519                             ncd.ncd_authlen = nfsm_rndup(ktick.kt.length) +
 520                                 3 * NFSX_UNSIGNED;
 521                             ncd.ncd_verfstr = (u_char *)&kverf;
 522                             ncd.ncd_verflen = sizeof (kverf);
 523                             memmove(ncd.ncd_key, kcr.session,
 524                                 sizeof (kcr.session));
 525                             kin.t1 = htonl(ktv.tv_sec);
 526                             kin.t2 = htonl(ktv.tv_usec);
 527                             kin.w1 = htonl(NFS_KERBTTL);
 528                             kin.w2 = htonl(NFS_KERBTTL - 1);
 529                             bzero((caddr_t)kivec, sizeof (kivec));
 530
 531                             /*
 532                              * Encrypt kin in CBC mode using the session
 533                              * key in kcr.
 534                              */
 535                             XXX
 536
 537                             /*
 538                              * Finally, fill the timestamp verifier into the
 539                              * authenticator and verifier.
 540                              */
 541                             ktick.kind = htonl(RPCAKN_FULLNAME);
 542                             kverf.kind = htonl(RPCAKN_FULLNAME);
 543                             NFS_KERBW1(ktick.kt) = kout.w1;
 544                             ktick.kt.length = htonl(ktick.kt.length);
 545                             kverf.verf.t1 = kout.t1;
 546                             kverf.verf.t2 = kout.t2;
 547                             kverf.verf.w2 = kout.w2;
 548                             nfssvc_flag = NFSSVC_MNTD | NFSSVC_GOTAUTH;
 549                         }
 550                         setreuid(0, 0);
 551 #endif /* NFSKERB */
 552                 }
 553         }
 554         exit(0);
 555 }
 556
 557 static int
 558 getnfsargs(char *spec, struct nfs_args *nfsargsp)
 559 {
 560         struct hostent *hp;
 561         struct sockaddr_in saddr;
 562         struct in_addr iaddr;
 563         enum tryret ret;
 564         int speclen, remoteerr;
 565         char *hostp, *delimp, *errstr;
 566 #ifdef NFSKERB
 567         char *cp;
 568 #endif
 569         size_t len;
 570         static char nam[MNAMELEN + 1];
 571
 572         if ((delimp = strrchr(spec, ':')) != NULL) {
 573                 hostp = spec;
 574                 spec = delimp + 1;
 575         } else if ((delimp = strrchr(spec, '@')) != NULL) {
 576                 warnx("path@server syntax is deprecated, use server:path");
 577                 hostp = delimp + 1;
 578         } else {
 579                 warnx("no <host>:<dirpath> nfs-name");
 580                 return (0);
 581         }
 582         *delimp = '\0';
 583
 584         /*
 585          * If there has been a trailing slash at mounttime it seems
 586          * that some mountd implementations fail to remove the mount
 587          * entries from their mountlist while unmounting.
 588          */
 589         for (speclen = strlen(spec);
 590                 speclen > 1 && spec[speclen - 1] == '/';
 591                 speclen--)
 592                 spec[speclen - 1] = '\0';
 593         if (strlen(hostp) + strlen(spec) + 1 > MNAMELEN) {
 594                 warnx("%s:%s: %s", hostp, spec, strerror(ENAMETOOLONG));
 595                 return (0);
 596         }
 597         /* Make both '@' and ':' notations equal */
 598         if (*hostp != '\0') {
 599                 len = strlen(hostp);
 600                 memmove(nam, hostp, len);
 601                 nam[len] = ':';
 602                 memmove(nam + len + 1, spec, speclen);
 603                 nam[len + speclen + 1] = '\0';
 604         }
 605
 606         /*
 607          * Handle an internet host address and reverse resolve it if
 608          * doing Kerberos.
 609          */
 610         bzero(&saddr, sizeof saddr);
 611         saddr.sin_family = AF_INET;
 612         saddr.sin_len = sizeof saddr;
 613
 614         if (port_no != 0)
 615                 saddr.sin_port = htons(port_no);
 616
 617         for (;;) {
 618                 int haserror = 0;
 619
 620                 /*
 621                  * Adjust DNS timeouts so we do not linger in the foreground
 622                  * if we can be backgrounded.
 623                  */
 624                 switch(opflags & (BGRND | ISBGRND)) {
 625                 case BGRND:
 626                         _res.retry = 1;
 627                         _res.retrans = 1;
 628                         break;
 629                 case BGRND|ISBGRND:
 630                         _res.retry = 3;
 631                         _res.retrans = 3;
 632                         break;
 633                 }
 634                 if (inet_pton(AF_INET, hostp, &iaddr) == 1) {
 635                         saddr.sin_addr = iaddr;
 636                 } else if ((hp = gethostbyname(hostp)) != NULL) {
 637                         memmove(&saddr.sin_addr, hp->h_addr,
 638                             MIN(hp->h_length, (int)sizeof(saddr.sin_addr)));
 639                 } else {
 640                         warnx("can't get net id for host: %s", hostp);
 641                         opflags |= DIDWARN;
 642                         haserror = h_errno;
 643                 }
 644 #ifdef NFSKERB
 645                 if (haserror == 0 && (nfsargsp->flags & NFSMNT_KERB)) {
 646                         if ((hp = gethostbyaddr(&saddr.sin_addr.s_addr,
 647                             sizeof (u_long), AF_INET)) == NULL) {
 648                                 warnx("can't reverse resolve net address");
 649                                 opflags |= DIDWARN;
 650                                 haserror = h_errno;
 651                         } else {
 652                                 memmove(&saddr.sin_addr, hp->h_addr,
 653                                     MIN(hp->h_length, sizeof(saddr.sin_addr)));
 654                                 strncpy(inst, hp->h_name, INST_SZ);
 655                                 inst[INST_SZ - 1] = '\0';
 656                                 if (cp = strchr(inst, '.'))
 657                                         *cp = '\0';
 658                         }
 659                 }
 660 #endif /* NFSKERB */
 661                 /*
 662                  * If no error occured we do not have to retry again.
 663                  * Otherwise try to backgruond us if possible.
 664                  */
 665                 if (haserror == 0)
 666                     break;
 667
 668                 switch(opflags & (BGRND | ISBGRND)) {
 669                 case BGRND:
 670                         if (haserror != EAI_AGAIN)
 671                                 return(0);
 672                         /* recoverable error */
 673                         warnx("Cannot immediately mount %s:%s, backgrounding",
 674                             hostp, spec);
 675                         opflags |= DIDWARN;
 676                         opflags |= ISBGRND;
 677                         if (daemon(0, 0) != 0)
 678                                 err(1, "daemon");
 679                         break;
 680                 default:
 681                         /*
 682                          * Already backgrounded or cannot be backgrounded.
 683                          */
 684                         if (haserror != EAI_AGAIN)
 685                                 return(0);
 686                         break;
 687                 }
 688                 sleep(20);
 689                 endhostent();
 690         }
 691         if (opflags & DIDWARN) {
 692                 opflags &= ~DIDWARN;
 693                 warnx("successfully resolved %s after prior failures", hostp);
 694         }
 695
 696         ret = TRYRET_LOCALERR;
 697         for (;;) {
 698                 remoteerr = 0;
 699                 ret = nfs_tryproto(nfsargsp, &saddr, hostp, spec, &errstr);
 700                 if (ret == TRYRET_SUCCESS)
 701                         break;
 702                 if (ret != TRYRET_LOCALERR)
 703                         remoteerr = 1;
 704                 if ((opflags & ISBGRND) == 0)
 705                         fprintf(stderr, "%s\n", errstr);
 706
 707                 /* Exit if all errors were local. */
 708                 if (!remoteerr)
 709                         exit(1);
 710
 711                 /*
 712                  * If retrycnt == 0, we are to keep retrying forever.
 713                  * Otherwise decrement it, and exit if it hits zero.
 714                  */
 715                 if (retrycnt != 0 && --retrycnt == 0)
 716                         exit(1);
 717
 718                 if ((opflags & (BGRND | ISBGRND)) == BGRND) {
 719                         warnx("Cannot immediately mount %s:%s, backgrounding",
 720                             hostp, spec);
 721                         opflags |= ISBGRND;
 722                         opflags |= DIDWARN;
 723                         if (daemon(0, 0) != 0)
 724                                 err(1, "daemon");
 725                 }
 726                 sleep(20);
 727         }
 728         if (opflags & DIDWARN) {
 729                 opflags &= ~DIDWARN;
 730                 warnx("successfully mounted %s after prior failures", spec);
 731         }
 732         nfsargsp->hostname = nam;
 733         /* Add mounted filesystem to PATH_MOUNTTAB */
 734         if (!add_mtab(hostp, spec))
 735                 warnx("can't update %s for %s:%s", PATH_MOUNTTAB, hostp, spec);
 736         return (1);
 737 }
 738
 739 /*
 740  * Try to set up the NFS arguments according to the address
 741  * (and possibly port) specified by `sinp'.
 742  *
 743  * Returns TRYRET_SUCCESS if successful, or:
 744  *   TRYRET_TIMEOUT             The server did not respond.
 745  *   TRYRET_REMOTEERR           The server reported an error.
 746  *   TRYRET_LOCALERR            Local failure.
 747  *
 748  * In all error cases, *errstr will be set to a statically-allocated string
 749  * describing the error.
 750  */
 751 static enum tryret
 752 nfs_tryproto(struct nfs_args *nfsargsp, struct sockaddr_in *sinp, char *hostp,
 753     char *spec, char **errstr)
 754 {
 755         static char errbuf[256];
 756         struct sockaddr_in sin, tmpsin;
 757         struct nfhret nfhret;
 758         struct timeval try;
 759         struct rpc_err rpcerr;
 760         CLIENT *clp;
 761         int doconnect, nfsvers, mntvers, so;
 762         enum clnt_stat status;
 763         enum mountmode trymntmode;
 764
 765         trymntmode = mountmode;
 766         errbuf[0] = '\0';
 767         *errstr = errbuf;
 768         sin = tmpsin = *sinp;
 769
 770 tryagain:
 771         if (trymntmode == V2) {
 772                 nfsvers = 2;
 773                 mntvers = 1;
 774         } else {
 775                 nfsvers = 3;
 776                 mntvers = 3;
 777         }
 778
 779         /* Check that the server (nfsd) responds on the port we have chosen. */
 780         try.tv_sec = 10;
 781         try.tv_usec = 0;
 782         so = RPC_ANYSOCK;
 783         if (nfsargsp->sotype == SOCK_STREAM)
 784                 clp = clnttcp_create(&sin, RPCPROG_NFS, nfsvers, &so, 0, 0);
 785         else
 786                 clp = clntudp_create(&sin, RPCPROG_NFS, nfsvers, try, &so);
 787         if (clp == NULL) {
 788                 snprintf(errbuf, sizeof errbuf, "%s:%s: %s",
 789                     hostp, spec, clnt_spcreateerror("nfsd: RPCPROG_NFS"));
 790                 return (returncode(rpc_createerr.cf_stat,
 791                     &rpc_createerr.cf_error));
 792         }
 793         if (nfsargsp->sotype == SOCK_DGRAM &&
 794             !(nfsargsp->flags & NFSMNT_NOCONN)) {
 795                 /*
 796                  * Use connect(), to match what the kernel does. This
 797                  * catches cases where the server responds from the
 798                  * wrong source address.
 799                  */
 800                 doconnect = 1;
 801                 if (!clnt_control(clp, CLSET_CONNECT, (char *)&doconnect)) {
 802                         clnt_destroy(clp);
 803                         snprintf(errbuf, sizeof errbuf,
 804                             "%s:%s: CLSET_CONNECT failed", hostp, spec);
 805                         return (TRYRET_LOCALERR);
 806                 }
 807         }
 808
 809         try.tv_sec = 10;
 810         try.tv_usec = 0;
 811         status = clnt_call(clp, NFSPROC_NULL, xdr_void, NULL, xdr_void, NULL,
 812             try);
 813         if (status != RPC_SUCCESS) {
 814                 if (status == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
 815                         clnt_destroy(clp);
 816                         trymntmode = V2;
 817                         goto tryagain;
 818                 }
 819                 clnt_geterr(clp, &rpcerr);
 820                 snprintf(errbuf, sizeof errbuf, "%s:%s: %s",
 821                     hostp, spec, clnt_sperror(clp, "NFSPROC_NULL"));
 822                 clnt_destroy(clp);
 823                 return (returncode(status, &rpcerr));
 824         }
 825         clnt_destroy(clp);
 826
 827         /* Send the RPCMNT_MOUNT RPC to get the root filehandle. */
 828         tmpsin.sin_port = 0;
 829         try.tv_sec = 10;
 830         try.tv_usec = 0;
 831         so = RPC_ANYSOCK;
 832         if (mnttcp_ok && nfsargsp->sotype == SOCK_STREAM)
 833                 clp = clnttcp_create(&tmpsin, RPCPROG_MNT, mntvers, &so, 0, 0);
 834         else
 835                 clp = clntudp_create(&tmpsin, RPCPROG_MNT, mntvers, try, &so);
 836         if (clp == NULL) {
 837                 snprintf(errbuf, sizeof errbuf, "%s:%s: %s",
 838                     hostp, spec, clnt_spcreateerror("RPCMNT: clnt_create"));
 839                 return (returncode(rpc_createerr.cf_stat,
 840                     &rpc_createerr.cf_error));
 841         }
 842         clp->cl_auth = authunix_create_default();
 843         if (nfsargsp->flags & NFSMNT_KERB)
 844                 nfhret.auth = RPCAUTH_KERB4;
 845         else
 846                 nfhret.auth = RPCAUTH_UNIX;
 847         nfhret.vers = mntvers;
 848         status = clnt_call(clp, RPCMNT_MOUNT, xdr_dir, spec, xdr_fh, &nfhret,
 849             try);
 850         auth_destroy(clp->cl_auth);
 851         if (status != RPC_SUCCESS) {
 852                 if (status == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
 853                         clnt_destroy(clp);
 854                         trymntmode = V2;
 855                         goto tryagain;
 856                 }
 857                 clnt_geterr(clp, &rpcerr);
 858                 snprintf(errbuf, sizeof errbuf, "%s:%s: %s",
 859                     hostp, spec, clnt_sperror(clp, "RPCPROG_MNT"));
 860                 clnt_destroy(clp);
 861                 return (returncode(status, &rpcerr));
 862         }
 863         clnt_destroy(clp);
 864
 865         if (nfhret.stat != 0) {
 866                 snprintf(errbuf, sizeof errbuf, "%s:%s: %s",
 867                     hostp, spec, strerror(nfhret.stat));
 868                 return (TRYRET_REMOTEERR);
 869         }
 870
 871         /*
 872          * Store the filehandle and server address in nfsargsp, making
 873          * sure to copy any locally allocated structures.
 874          */
 875         nfsargsp->addrlen = sin.sin_len;
 876         nfsargsp->addr = malloc(nfsargsp->addrlen);
 877         nfsargsp->fhsize = nfhret.fhsize;
 878         nfsargsp->fh = malloc(nfsargsp->fhsize);
 879         if (nfsargsp->addr == NULL || nfsargsp->fh == NULL)
 880                 err(1, "malloc");
 881         bcopy(&sin, nfsargsp->addr, nfsargsp->addrlen);
 882         bcopy(nfhret.nfh, nfsargsp->fh, nfsargsp->fhsize);
 883
 884         if (nfsvers == 3)
 885                 nfsargsp->flags |= NFSMNT_NFSV3;
 886         else
 887                 nfsargsp->flags &= ~NFSMNT_NFSV3;
 888
 889         return (TRYRET_SUCCESS);
 890 }
 891
 892 /*
 893  * Catagorise a RPC return status and error into an `enum tryret'
 894  * return code.
 895  */
 896 static enum tryret
 897 returncode(enum clnt_stat status, struct rpc_err *rpcerr)
 898 {
 899         switch (status) {
 900         case RPC_TIMEDOUT:
 901                 return (TRYRET_TIMEOUT);
 902         case RPC_PMAPFAILURE:
 903         case RPC_PROGNOTREGISTERED:
 904         case RPC_PROGVERSMISMATCH:
 905         /* XXX, these can be local or remote. */
 906         case RPC_CANTSEND:
 907         case RPC_CANTRECV:
 908                 return (TRYRET_REMOTEERR);
 909         case RPC_SYSTEMERROR:
 910                 switch (rpcerr->re_errno) {
 911                 case ETIMEDOUT:
 912                         return (TRYRET_TIMEOUT);
 913                 case ENOMEM:
 914                         break;
 915                 default:
 916                         return (TRYRET_REMOTEERR);
 917                 }
 918                 /* FALLTHROUGH */
 919         default:
 920                 break;
 921         }
 922         return (TRYRET_LOCALERR);
 923 }
 924
 925 /*
 926  * xdr routines for mount rpc's
 927  */
 928 static int
 929 xdr_dir(XDR *xdrsp, char *dirp)
 930 {
 931         return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
 932 }
 933
 934 static int
 935 xdr_fh(XDR *xdrsp, struct nfhret *np)
 936 {
 937         int i;
 938         long auth, authcnt, authfnd = 0;
 939
 940         if (!xdr_u_long(xdrsp, &np->stat))
 941                 return (0);
 942         if (np->stat)
 943                 return (1);
 944         switch (np->vers) {
 945         case 1:
 946                 np->fhsize = NFSX_V2FH;
 947                 return (xdr_opaque(xdrsp, (caddr_t)np->nfh, NFSX_V2FH));
 948         case 3:
 949                 if (!xdr_long(xdrsp, &np->fhsize))
 950                         return (0);
 951                 if (np->fhsize <= 0 || np->fhsize > NFSX_V3FHMAX)
 952                         return (0);
 953                 if (!xdr_opaque(xdrsp, (caddr_t)np->nfh, np->fhsize))
 954                         return (0);
 955                 if (!xdr_long(xdrsp, &authcnt))
 956                         return (0);
 957                 for (i = 0; i < authcnt; i++) {
 958                         if (!xdr_long(xdrsp, &auth))
 959                                 return (0);
 960                         if (auth == np->auth)
 961                                 authfnd++;
 962                 }
 963                 /*
 964                  * Some servers, such as DEC's OSF/1 return a nil authenticator
 965                  * list to indicate RPCAUTH_UNIX.
 966                  */
 967                 if (!authfnd && (authcnt > 0 || np->auth != RPCAUTH_UNIX))
 968                         np->stat = EAUTH;
 969                 return (1);
 970         };
 971         return (0);
 972 }
 973
 974 static void
 975 usage(void)
 976 {
 977         fprintf(stderr, "%s\n%s\n%s\n%s\n",
 978 "usage: mount_nfs [-23KNPTUbcdils] [-D deadthresh] [-I readdirsize]",
 979 "                 [-R retrycnt] [-a maxreadahead]",
 980 "                 [-g maxgroups] [-m realm] [-o options] [-r readsize]",
 981 "                 [-t timeout] [-w writesize] [-x retrans] rhost:path node");
 982         exit(1);
 983 }