sbin/mount_nfs/mount_nfs.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1992, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Rick Macklem at The University of Guelph.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #if 0
  36 #ifndef lint
  37 static const char copyright[] =
  38 "@(#) Copyright (c) 1992, 1993, 1994\n\
  39         The Regents of the University of California.  All rights reserved.\n";
  40 #endif /* not lint */
  41
  42 #ifndef lint
  43 static char sccsid[] = "@(#)mount_nfs.c 8.11 (Berkeley) 5/4/95";
  44 #endif /* not lint */
  45 #endif
  46 #include <sys/cdefs.h>
  47 __FBSDID("$FreeBSD$");
  48
  49 #include <sys/param.h>
  50 #include <sys/linker.h>
  51 #include <sys/module.h>
  52 #include <sys/mount.h>
  53 #include <sys/socket.h>
  54 #include <sys/stat.h>
  55 #include <sys/syslog.h>
  56 #include <sys/uio.h>
  57
  58 #include <rpc/rpc.h>
  59 #include <rpc/pmap_clnt.h>
  60 #include <rpc/pmap_prot.h>
  61 #include <rpcsvc/nfs_prot.h>
  62 #include <rpcsvc/mount.h>
  63
  64 #include <fs/nfs/nfsproto.h>
  65 #include <fs/nfs/nfsv4_errstr.h>
  66
  67 #include <arpa/inet.h>
  68 #include <net/route.h>
  69 #include <net/if.h>
  70
  71 #include <ctype.h>
  72 #include <err.h>
  73 #include <errno.h>
  74 #include <fcntl.h>
  75 #include <netdb.h>
  76 #include <stdio.h>
  77 #include <stdlib.h>
  78 #include <string.h>
  79 #include <strings.h>
  80 #include <sysexits.h>
  81 #include <unistd.h>
  82
  83 #include "mntopts.h"
  84 #include "mounttab.h"
  85
  86 /* Table for af,sotype -> netid conversions. */
  87 static struct nc_protos {
  88         const char *netid;
  89         int af;
  90         int sotype;
  91 } nc_protos[] = {
  92         {"udp",         AF_INET,        SOCK_DGRAM},
  93         {"tcp",         AF_INET,        SOCK_STREAM},
  94         {"udp6",        AF_INET6,       SOCK_DGRAM},
  95         {"tcp6",        AF_INET6,       SOCK_STREAM},
  96         {NULL,          0,              0}
  97 };
  98
  99 struct nfhret {
 100         u_long          stat;
 101         long            vers;
 102         long            auth;
 103         long            fhsize;
 104         u_char          nfh[NFS3_FHSIZE];
 105 };
 106 #define BGRND           0x01
 107 #define ISBGRND         0x02
 108 #define OF_NOINET4      0x04
 109 #define OF_NOINET6      0x08
 110 #define BGRNDNOW        0x10
 111 static int retrycnt = -1;
 112 static int opflags = 0;
 113 static int nfsproto = IPPROTO_TCP;
 114 static int mnttcp_ok = 1;
 115 static int noconn = 0;
 116 /* The 'portspec' is the server nfs port; NULL means look up via rpcbind. */
 117 static const char *portspec = NULL;
 118 static struct sockaddr *addr;
 119 static int addrlen = 0;
 120 static u_char *fh = NULL;
 121 static int fhsize = 0;
 122 static int secflavor = -1;
 123 static int got_principal = 0;
 124
 125 static enum mountmode {
 126         ANY,
 127         V2,
 128         V3,
 129         V4
 130 } mountmode = ANY;
 131
 132 /* Return codes for nfs_tryproto. */
 133 enum tryret {
 134         TRYRET_SUCCESS,
 135         TRYRET_TIMEOUT,         /* No response received. */
 136         TRYRET_REMOTEERR,       /* Error received from remote server. */
 137         TRYRET_LOCALERR         /* Local failure. */
 138 };
 139
 140 static int      sec_name_to_num(const char *sec);
 141 static const char       *sec_num_to_name(int num);
 142 static int      getnfsargs(char **, char **, struct iovec **iov, int *iovlen);
 143 /* void set_rpc_maxgrouplist(int); */
 144 static struct netconfig *getnetconf_cached(const char *netid);
 145 static const char       *netidbytype(int af, int sotype);
 146 static void     usage(void) __dead2;
 147 static int      xdr_dir(XDR *, char *);
 148 static int      xdr_fh(XDR *, struct nfhret *);
 149 static enum tryret nfs_tryproto(struct addrinfo *ai, char *hostp, char *spec,
 150     char **errstr, struct iovec **iov, int *iovlen);
 151 static enum tryret returncode(enum clnt_stat stat, struct rpc_err *rpcerr);
 152
 153 int
 154 main(int argc, char *argv[])
 155 {
 156         int c;
 157         struct iovec *iov;
 158         int num, iovlen;
 159         char *host, *mntname, *p, *spec, *tmp;
 160         char mntpath[MAXPATHLEN], errmsg[255];
 161         char hostname[MAXHOSTNAMELEN + 1], gssn[MAXHOSTNAMELEN + 50];
 162         const char *gssname, *nmount_errstr;
 163
 164         iov = NULL;
 165         iovlen = 0;
 166         memset(errmsg, 0, sizeof(errmsg));
 167         gssname = NULL;
 168
 169         while ((c = getopt(argc, argv,
 170             "23a:bcdD:g:I:iLlNo:PR:r:sTt:w:x:U")) != -1)
 171                 switch (c) {
 172                 case '2':
 173                         mountmode = V2;
 174                         break;
 175                 case '3':
 176                         mountmode = V3;
 177                         break;
 178                 case 'a':
 179                         printf("-a deprecated, use -o readahead=<value>\n");
 180                         build_iovec(&iov, &iovlen, "readahead", optarg, (size_t)-1);
 181                         break;
 182                 case 'b':
 183                         opflags |= BGRND;
 184                         break;
 185                 case 'c':
 186                         printf("-c deprecated, use -o noconn\n");
 187                         build_iovec(&iov, &iovlen, "noconn", NULL, 0);
 188                         noconn = 1;
 189                         break;
 190                 case 'D':
 191                         printf("-D deprecated, use -o deadthresh=<value>\n");
 192                         build_iovec(&iov, &iovlen, "deadthresh", optarg, (size_t)-1);
 193                         break;
 194                 case 'd':
 195                         printf("-d deprecated, use -o dumbtimer");
 196                         build_iovec(&iov, &iovlen, "dumbtimer", NULL, 0);
 197                         break;
 198                 case 'g':
 199                         printf("-g deprecated, use -o maxgroups");
 200                         num = strtol(optarg, &p, 10);
 201                         if (*p || num <= 0)
 202                                 errx(1, "illegal -g value -- %s", optarg);
 203                         //set_rpc_maxgrouplist(num);
 204                         build_iovec(&iov, &iovlen, "maxgroups", optarg, (size_t)-1);
 205                         break;
 206                 case 'I':
 207                         printf("-I deprecated, use -o readdirsize=<value>\n");
 208                         build_iovec(&iov, &iovlen, "readdirsize", optarg, (size_t)-1);
 209                         break;
 210                 case 'i':
 211                         printf("-i deprecated, use -o intr\n");
 212                         build_iovec(&iov, &iovlen, "intr", NULL, 0);
 213                         break;
 214                 case 'L':
 215                         printf("-L deprecated, use -o nolockd\n");
 216                         build_iovec(&iov, &iovlen, "nolockd", NULL, 0);
 217                         break;
 218                 case 'l':
 219                         printf("-l deprecated, -o rdirplus\n");
 220                         build_iovec(&iov, &iovlen, "rdirplus", NULL, 0);
 221                         break;
 222                 case 'N':
 223                         printf("-N deprecated, do not specify -o resvport\n");
 224                         break;
 225                 case 'o': {
 226                         int pass_flag_to_nmount;
 227                         char *opt = optarg;
 228                         while (opt) {
 229                                 char *pval = NULL;
 230                                 char *pnextopt = NULL;
 231                                 const char *val = "";
 232                                 pass_flag_to_nmount = 1;
 233                                 pnextopt = strchr(opt, ',');
 234                                 if (pnextopt != NULL) {
 235                                         *pnextopt = '\0';
 236                                         pnextopt++;
 237                                 }
 238                                 pval = strchr(opt, '=');
 239                                 if (pval != NULL) {
 240                                         *pval = '\0';
 241                                         val = pval + 1;
 242                                 }
 243                                 if (strcmp(opt, "bg") == 0) {
 244                                         opflags |= BGRND;
 245                                         pass_flag_to_nmount=0;
 246                                 } else if (strcmp(opt, "bgnow") == 0) {
 247                                         opflags |= BGRNDNOW;
 248                                         pass_flag_to_nmount=0;
 249                                 } else if (strcmp(opt, "fg") == 0) {
 250                                         /* same as not specifying -o bg */
 251                                         pass_flag_to_nmount=0;
 252                                 } else if (strcmp(opt, "gssname") == 0) {
 253                                         pass_flag_to_nmount = 0;
 254                                         gssname = val;
 255                                 } else if (strcmp(opt, "mntudp") == 0) {
 256                                         mnttcp_ok = 0;
 257                                         nfsproto = IPPROTO_UDP;
 258                                 } else if (strcmp(opt, "udp") == 0) {
 259                                         nfsproto = IPPROTO_UDP;
 260                                 } else if (strcmp(opt, "tcp") == 0) {
 261                                         nfsproto = IPPROTO_TCP;
 262                                 } else if (strcmp(opt, "noinet4") == 0) {
 263                                         pass_flag_to_nmount=0;
 264                                         opflags |= OF_NOINET4;
 265                                 } else if (strcmp(opt, "noinet6") == 0) {
 266                                         pass_flag_to_nmount=0;
 267                                         opflags |= OF_NOINET6;
 268                                 } else if (strcmp(opt, "noconn") == 0) {
 269                                         noconn = 1;
 270                                 } else if (strcmp(opt, "nfsv2") == 0) {
 271                                         pass_flag_to_nmount=0;
 272                                         mountmode = V2;
 273                                 } else if (strcmp(opt, "nfsv3") == 0) {
 274                                         mountmode = V3;
 275                                 } else if (strcmp(opt, "nfsv4") == 0) {
 276                                         pass_flag_to_nmount=0;
 277                                         mountmode = V4;
 278                                         nfsproto = IPPROTO_TCP;
 279                                         if (portspec == NULL)
 280                                                 portspec = "2049";
 281                                 } else if (strcmp(opt, "port") == 0) {
 282                                         pass_flag_to_nmount=0;
 283                                         asprintf(&tmp, "%d", atoi(val));
 284                                         if (tmp == NULL)
 285                                                 err(1, "asprintf");
 286                                         portspec = tmp;
 287                                 } else if (strcmp(opt, "principal") == 0) {
 288                                         got_principal = 1;
 289                                 } else if (strcmp(opt, "proto") == 0) {
 290                                         pass_flag_to_nmount=0;
 291                                         if (strcmp(val, "tcp") == 0) {
 292                                                 nfsproto = IPPROTO_TCP;
 293                                                 opflags |= OF_NOINET6;
 294                                                 build_iovec(&iov, &iovlen,
 295                                                     "tcp", NULL, 0);
 296                                         } else if (strcmp(val, "udp") == 0) {
 297                                                 mnttcp_ok = 0;
 298                                                 nfsproto = IPPROTO_UDP;
 299                                                 opflags |= OF_NOINET6;
 300                                                 build_iovec(&iov, &iovlen,
 301                                                     "udp", NULL, 0);
 302                                         } else if (strcmp(val, "tcp6") == 0) {
 303                                                 nfsproto = IPPROTO_TCP;
 304                                                 opflags |= OF_NOINET4;
 305                                                 build_iovec(&iov, &iovlen,
 306                                                     "tcp", NULL, 0);
 307                                         } else if (strcmp(val, "udp6") == 0) {
 308                                                 mnttcp_ok = 0;
 309                                                 nfsproto = IPPROTO_UDP;
 310                                                 opflags |= OF_NOINET4;
 311                                                 build_iovec(&iov, &iovlen,
 312                                                     "udp", NULL, 0);
 313                                         } else {
 314                                                 errx(1,
 315                                                     "illegal proto value -- %s",
 316                                                     val);
 317                                         }
 318                                 } else if (strcmp(opt, "sec") == 0) {
 319                                         /*
 320                                          * Don't add this option to
 321                                          * the iovec yet - we will
 322                                          * negotiate which sec flavor
 323                                          * to use with the remote
 324                                          * mountd.
 325                                          */
 326                                         pass_flag_to_nmount=0;
 327                                         secflavor = sec_name_to_num(val);
 328                                         if (secflavor < 0) {
 329                                                 errx(1,
 330                                                     "illegal sec value -- %s",
 331                                                     val);
 332                                         }
 333                                 } else if (strcmp(opt, "retrycnt") == 0) {
 334                                         pass_flag_to_nmount=0;
 335                                         num = strtol(val, &p, 10);
 336                                         if (*p || num < 0)
 337                                                 errx(1, "illegal retrycnt value -- %s", val);
 338                                         retrycnt = num;
 339                                 } else if (strcmp(opt, "maxgroups") == 0) {
 340                                         num = strtol(val, &p, 10);
 341                                         if (*p || num <= 0)
 342                                                 errx(1, "illegal maxgroups value -- %s", val);
 343                                         //set_rpc_maxgrouplist(num);
 344                                 } else if (strcmp(opt, "vers") == 0) {
 345                                         num = strtol(val, &p, 10);
 346                                         if (*p || num <= 0)
 347                                                 errx(1, "illegal vers value -- "
 348                                                     "%s", val);
 349                                         switch (num) {
 350                                         case 2:
 351                                                 mountmode = V2;
 352                                                 break;
 353                                         case 3:
 354                                                 mountmode = V3;
 355                                                 build_iovec(&iov, &iovlen,
 356                                                     "nfsv3", NULL, 0);
 357                                                 break;
 358                                         case 4:
 359                                                 mountmode = V4;
 360                                                 nfsproto = IPPROTO_TCP;
 361                                                 if (portspec == NULL)
 362                                                         portspec = "2049";
 363                                                 break;
 364                                         default:
 365                                                 errx(1, "illegal nfs version "
 366                                                     "value -- %s", val);
 367                                         }
 368                                         pass_flag_to_nmount=0;
 369                                 }
 370                                 if (pass_flag_to_nmount) {
 371                                         build_iovec(&iov, &iovlen, opt,
 372                                             __DECONST(void *, val),
 373                                             strlen(val) + 1);
 374                                 }
 375                                 opt = pnextopt;
 376                         }
 377                         }
 378                         break;
 379                 case 'P':
 380                         /* obsolete for -o noresvport now default */
 381                         printf("-P deprecated, use -o noresvport\n");
 382                         build_iovec(&iov, &iovlen, "noresvport", NULL, 0);
 383                         break;
 384                 case 'R':
 385                         printf("-R deprecated, use -o retrycnt=<retrycnt>\n");
 386                         num = strtol(optarg, &p, 10);
 387                         if (*p || num < 0)
 388                                 errx(1, "illegal -R value -- %s", optarg);
 389                         retrycnt = num;
 390                         break;
 391                 case 'r':
 392                         printf("-r deprecated, use -o rsize=<rsize>\n");
 393                         build_iovec(&iov, &iovlen, "rsize", optarg, (size_t)-1);
 394                         break;
 395                 case 's':
 396                         printf("-s deprecated, use -o soft\n");
 397                         build_iovec(&iov, &iovlen, "soft", NULL, 0);
 398                         break;
 399                 case 'T':
 400                         nfsproto = IPPROTO_TCP;
 401                         printf("-T deprecated, use -o tcp\n");
 402                         break;
 403                 case 't':
 404                         printf("-t deprecated, use -o timeout=<value>\n");
 405                         build_iovec(&iov, &iovlen, "timeout", optarg, (size_t)-1);
 406                         break;
 407                 case 'w':
 408                         printf("-w deprecated, use -o wsize=<value>\n");
 409                         build_iovec(&iov, &iovlen, "wsize", optarg, (size_t)-1);
 410                         break;
 411                 case 'x':
 412                         printf("-x deprecated, use -o retrans=<value>\n");
 413                         build_iovec(&iov, &iovlen, "retrans", optarg, (size_t)-1);
 414                         break;
 415                 case 'U':
 416                         printf("-U deprecated, use -o mntudp\n");
 417                         mnttcp_ok = 0;
 418                         nfsproto = IPPROTO_UDP;
 419                         build_iovec(&iov, &iovlen, "mntudp", NULL, 0);
 420                         break;
 421                 default:
 422                         usage();
 423                         break;
 424                 }
 425         argc -= optind;
 426         argv += optind;
 427
 428         if ((opflags & (BGRND | BGRNDNOW)) == (BGRND | BGRNDNOW))
 429                 errx(1, "Options bg and bgnow are mutually exclusive");
 430
 431         if (argc != 2) {
 432                 usage();
 433                 /* NOTREACHED */
 434         }
 435
 436         spec = *argv++;
 437         mntname = *argv;
 438
 439         if (retrycnt == -1)
 440                 /* The default is to keep retrying forever. */
 441                 retrycnt = 0;
 442
 443         if (modfind("nfscl") < 0) {
 444                 /* Not present in kernel, try loading it */
 445                 if (kldload("nfscl") < 0 ||
 446                     modfind("nfscl") < 0)
 447                         errx(1, "nfscl is not available");
 448         }
 449
 450         /*
 451          * Add the fqdn to the gssname, as required.
 452          */
 453         if (gssname != NULL) {
 454                 if (strchr(gssname, '@') == NULL &&
 455                     gethostname(hostname, MAXHOSTNAMELEN) == 0) {
 456                         snprintf(gssn, sizeof (gssn), "%s@%s", gssname,
 457                             hostname);
 458                         gssname = gssn;
 459                 }
 460                 build_iovec(&iov, &iovlen, "gssname",
 461                     __DECONST(void *, gssname), strlen(gssname) + 1);
 462         }
 463
 464         if (!getnfsargs(&spec, &host, &iov, &iovlen))
 465                 exit(1);
 466
 467         /* resolve the mountpoint with realpath(3) */
 468         if (checkpath(mntname, mntpath) != 0)
 469                 err(1, "%s", mntpath);
 470
 471         build_iovec_argf(&iov, &iovlen, "fstype", "nfs");
 472         build_iovec(&iov, &iovlen, "fspath", mntpath, (size_t)-1);
 473         build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
 474
 475         if (nmount(iov, iovlen, 0)) {
 476                 nmount_errstr = nfsv4_geterrstr(errno);
 477                 if (mountmode == V4 && nmount_errstr != NULL)
 478                         errx(1, "nmount: %s, %s", mntpath, nmount_errstr);
 479                 else
 480                         err(1, "nmount: %s%s%s", mntpath, errmsg[0] ? ", " : "",
 481                             errmsg);
 482         } else if (mountmode != V4 && !add_mtab(host, spec)) {
 483                 /* Add mounted file system to PATH_MOUNTTAB */
 484                 warnx("can't update %s for %s:%s", PATH_MOUNTTAB, host, spec);
 485         }
 486
 487         exit(0);
 488 }
 489
 490 static int
 491 sec_name_to_num(const char *sec)
 492 {
 493         if (!strcmp(sec, "krb5"))
 494                 return (RPCSEC_GSS_KRB5);
 495         if (!strcmp(sec, "krb5i"))
 496                 return (RPCSEC_GSS_KRB5I);
 497         if (!strcmp(sec, "krb5p"))
 498                 return (RPCSEC_GSS_KRB5P);
 499         if (!strcmp(sec, "sys"))
 500                 return (AUTH_SYS);
 501         return (-1);
 502 }
 503
 504 static const char *
 505 sec_num_to_name(int flavor)
 506 {
 507         switch (flavor) {
 508         case RPCSEC_GSS_KRB5:
 509                 return ("krb5");
 510         case RPCSEC_GSS_KRB5I:
 511                 return ("krb5i");
 512         case RPCSEC_GSS_KRB5P:
 513                 return ("krb5p");
 514         case AUTH_SYS:
 515                 return ("sys");
 516         }
 517         return (NULL);
 518 }
 519
 520 /*
 521  * Wait for RTM_IFINFO message with interface that is IFF_UP and with
 522  * link on, or until timeout expires.  Returns seconds left.
 523  */
 524 static time_t
 525 rtm_ifinfo_sleep(time_t sec)
 526 {
 527         char buf[2048] __aligned(__alignof(struct if_msghdr));
 528         fd_set rfds;
 529         struct timeval tv, start;
 530         ssize_t nread;
 531         int n, s;
 532
 533         s = socket(PF_ROUTE, SOCK_RAW, 0);
 534         if (s < 0)
 535                 err(EX_OSERR, "socket");
 536         (void)gettimeofday(&start, NULL);
 537
 538         for (tv.tv_sec = sec, tv.tv_usec = 0;
 539             tv.tv_sec > 0;
 540             (void)gettimeofday(&tv, NULL),
 541             tv.tv_sec = sec - (tv.tv_sec - start.tv_sec)) {
 542                 FD_ZERO(&rfds);
 543                 FD_SET(s, &rfds);
 544                 n = select(s + 1, &rfds, NULL, NULL, &tv);
 545                 if (n == 0)
 546                         continue;
 547                 if (n == -1) {
 548                         if (errno == EINTR)
 549                                 continue;
 550                         else
 551                                 err(EX_SOFTWARE, "select");
 552                 }
 553                 nread = read(s, buf, 2048);
 554                 if (nread < 0)
 555                         err(EX_OSERR, "read");
 556                 if ((size_t)nread >= sizeof(struct if_msghdr)) {
 557                         struct if_msghdr *ifm;
 558
 559                         ifm = (struct if_msghdr *)buf;
 560                         if (ifm->ifm_version == RTM_VERSION &&
 561                             ifm->ifm_type == RTM_IFINFO &&
 562                             (ifm->ifm_flags & IFF_UP) &&
 563                             ifm->ifm_data.ifi_link_state != LINK_STATE_DOWN)
 564                                 break;
 565                 }
 566         }
 567
 568         close(s);
 569
 570         return (tv.tv_sec);
 571 }
 572
 573 static int
 574 getnfsargs(char **specp, char **hostpp, struct iovec **iov, int *iovlen)
 575 {
 576         struct addrinfo hints, *ai_nfs, *ai;
 577         enum tryret ret;
 578         int ecode, speclen, remoteerr, offset, have_bracket = 0;
 579         char *hostp, *delimp, *errstr, *spec;
 580         size_t len;
 581         static char nam[MNAMELEN + 1], pname[MAXHOSTNAMELEN + 5];
 582
 583         spec = *specp;
 584         if (*spec == '[' && (delimp = strchr(spec + 1, ']')) != NULL &&
 585             *(delimp + 1) == ':') {
 586                 hostp = spec + 1;
 587                 spec = delimp + 2;
 588                 have_bracket = 1;
 589         } else if ((delimp = strrchr(spec, ':')) != NULL) {
 590                 hostp = spec;
 591                 spec = delimp + 1;
 592         } else if ((delimp = strrchr(spec, '@')) != NULL) {
 593                 warnx("path@server syntax is deprecated, use server:path");
 594                 hostp = delimp + 1;
 595         } else {
 596                 warnx("no <host>:<dirpath> nfs-name");
 597                 return (0);
 598         }
 599         *delimp = '\0';
 600
 601         /*
 602          * If there has been a trailing slash at mounttime it seems
 603          * that some mountd implementations fail to remove the mount
 604          * entries from their mountlist while unmounting.
 605          */
 606         for (speclen = strlen(spec);
 607                 speclen > 1 && spec[speclen - 1] == '/';
 608                 speclen--)
 609                 spec[speclen - 1] = '\0';
 610         if (strlen(hostp) + strlen(spec) + 1 > MNAMELEN) {
 611                 warnx("%s:%s: %s", hostp, spec, strerror(ENAMETOOLONG));
 612                 return (0);
 613         }
 614         /* Make both '@' and ':' notations equal */
 615         if (*hostp != '\0') {
 616                 len = strlen(hostp);
 617                 offset = 0;
 618                 if (have_bracket)
 619                         nam[offset++] = '[';
 620                 memmove(nam + offset, hostp, len);
 621                 if (have_bracket)
 622                         nam[len + offset++] = ']';
 623                 nam[len + offset++] = ':';
 624                 memmove(nam + len + offset, spec, speclen);
 625                 nam[len + speclen + offset] = '\0';
 626         }
 627
 628         /*
 629          * Handle an internet host address.
 630          */
 631         memset(&hints, 0, sizeof hints);
 632         hints.ai_flags = AI_NUMERICHOST;
 633         if (nfsproto == IPPROTO_TCP)
 634                 hints.ai_socktype = SOCK_STREAM;
 635         else if (nfsproto == IPPROTO_UDP)
 636                 hints.ai_socktype = SOCK_DGRAM;
 637
 638         if (getaddrinfo(hostp, portspec, &hints, &ai_nfs) != 0) {
 639                 hints.ai_flags = AI_CANONNAME;
 640                 if ((ecode = getaddrinfo(hostp, portspec, &hints, &ai_nfs))
 641                     != 0) {
 642                         if (portspec == NULL)
 643                                 errx(1, "%s: %s", hostp, gai_strerror(ecode));
 644                         else
 645                                 errx(1, "%s:%s: %s", hostp, portspec,
 646                                     gai_strerror(ecode));
 647                         return (0);
 648                 }
 649
 650                 /*
 651                  * For a Kerberized nfs mount where the "principal"
 652                  * argument has not been set, add it here.
 653                  */
 654                 if (got_principal == 0 && secflavor != AUTH_SYS &&
 655                     ai_nfs->ai_canonname != NULL) {
 656                         snprintf(pname, sizeof (pname), "nfs@%s",
 657                             ai_nfs->ai_canonname);
 658                         build_iovec(iov, iovlen, "principal", pname,
 659                             strlen(pname) + 1);
 660                 }
 661         }
 662
 663         if ((opflags & (BGRNDNOW | ISBGRND)) == BGRNDNOW) {
 664                 warnx("Mount %s:%s, backgrounding",
 665                     hostp, spec);
 666                 opflags |= ISBGRND;
 667                 if (daemon(0, 0) != 0)
 668                         err(1, "daemon");
 669         }
 670
 671         ret = TRYRET_LOCALERR;
 672         for (;;) {
 673                 /*
 674                  * Try each entry returned by getaddrinfo(). Note the
 675                  * occurrence of remote errors by setting `remoteerr'.
 676                  */
 677                 remoteerr = 0;
 678                 for (ai = ai_nfs; ai != NULL; ai = ai->ai_next) {
 679                         if ((ai->ai_family == AF_INET6) &&
 680                             (opflags & OF_NOINET6))
 681                                 continue;
 682                         if ((ai->ai_family == AF_INET) &&
 683                             (opflags & OF_NOINET4))
 684                                 continue;
 685                         ret = nfs_tryproto(ai, hostp, spec, &errstr, iov,
 686                             iovlen);
 687                         if (ret == TRYRET_SUCCESS)
 688                                 break;
 689                         if (ret != TRYRET_LOCALERR)
 690                                 remoteerr = 1;
 691                         if ((opflags & ISBGRND) == 0)
 692                                 fprintf(stderr, "%s\n", errstr);
 693                 }
 694                 if (ret == TRYRET_SUCCESS)
 695                         break;
 696
 697                 /* Exit if all errors were local. */
 698                 if (!remoteerr)
 699                         exit(1);
 700
 701                 /*
 702                  * If retrycnt == 0, we are to keep retrying forever.
 703                  * Otherwise decrement it, and exit if it hits zero.
 704                  */
 705                 if (retrycnt != 0 && --retrycnt == 0)
 706                         exit(1);
 707
 708                 if ((opflags & (BGRND | ISBGRND)) == BGRND) {
 709                         warnx("Cannot immediately mount %s:%s, backgrounding",
 710                             hostp, spec);
 711                         opflags |= ISBGRND;
 712                         if (daemon(0, 0) != 0)
 713                                 err(1, "daemon");
 714                 }
 715                 /*
 716                  * If rtm_ifinfo_sleep() returns non-zero, don't count
 717                  * that as a retry attempt.
 718                  */
 719                 if (rtm_ifinfo_sleep(60) && retrycnt != 0)
 720                         retrycnt++;
 721         }
 722         freeaddrinfo(ai_nfs);
 723
 724         build_iovec(iov, iovlen, "hostname", nam, (size_t)-1);
 725
 726         *specp = spec;
 727         *hostpp = hostp;
 728         return (1);
 729 }
 730
 731 /*
 732  * Try to set up the NFS arguments according to the address
 733  * family, protocol (and possibly port) specified in `ai'.
 734  *
 735  * Returns TRYRET_SUCCESS if successful, or:
 736  *   TRYRET_TIMEOUT             The server did not respond.
 737  *   TRYRET_REMOTEERR           The server reported an error.
 738  *   TRYRET_LOCALERR            Local failure.
 739  *
 740  * In all error cases, *errstr will be set to a statically-allocated string
 741  * describing the error.
 742  */
 743 static enum tryret
 744 nfs_tryproto(struct addrinfo *ai, char *hostp, char *spec, char **errstr,
 745     struct iovec **iov, int *iovlen)
 746 {
 747         static char errbuf[256];
 748         struct sockaddr_storage nfs_ss;
 749         struct netbuf nfs_nb;
 750         struct nfhret nfhret;
 751         struct timeval try;
 752         struct rpc_err rpcerr;
 753         CLIENT *clp;
 754         struct netconfig *nconf, *nconf_mnt;
 755         const char *netid, *netid_mnt, *secname;
 756         int doconnect, nfsvers, mntvers, sotype;
 757         enum clnt_stat clntstat;
 758         enum mountmode trymntmode;
 759
 760         sotype = 0;
 761         trymntmode = mountmode;
 762         errbuf[0] = '\0';
 763         *errstr = errbuf;
 764
 765         if (nfsproto == IPPROTO_TCP)
 766                 sotype = SOCK_STREAM;
 767         else if (nfsproto == IPPROTO_UDP)
 768                 sotype = SOCK_DGRAM;
 769
 770         if ((netid = netidbytype(ai->ai_family, sotype)) == NULL) {
 771                 snprintf(errbuf, sizeof errbuf,
 772                     "af %d sotype %d not supported", ai->ai_family, sotype);
 773                 return (TRYRET_LOCALERR);
 774         }
 775         if ((nconf = getnetconf_cached(netid)) == NULL) {
 776                 snprintf(errbuf, sizeof errbuf, "%s: %s", netid, nc_sperror());
 777                 return (TRYRET_LOCALERR);
 778         }
 779         /* The RPCPROG_MNT netid may be different. */
 780         if (mnttcp_ok) {
 781                 netid_mnt = netid;
 782                 nconf_mnt = nconf;
 783         } else {
 784                 if ((netid_mnt = netidbytype(ai->ai_family, SOCK_DGRAM))
 785                      == NULL) {
 786                         snprintf(errbuf, sizeof errbuf,
 787                             "af %d sotype SOCK_DGRAM not supported",
 788                              ai->ai_family);
 789                         return (TRYRET_LOCALERR);
 790                 }
 791                 if ((nconf_mnt = getnetconf_cached(netid_mnt)) == NULL) {
 792                         snprintf(errbuf, sizeof errbuf, "%s: %s", netid_mnt,
 793                             nc_sperror());
 794                         return (TRYRET_LOCALERR);
 795                 }
 796         }
 797
 798 tryagain:
 799         if (trymntmode == V4) {
 800                 nfsvers = 4;
 801                 mntvers = 3; /* Workaround for GCC. */
 802         } else if (trymntmode == V2) {
 803                 nfsvers = 2;
 804                 mntvers = 1;
 805         } else {
 806                 nfsvers = 3;
 807                 mntvers = 3;
 808         }
 809
 810         if (portspec != NULL) {
 811                 /* `ai' contains the complete nfsd sockaddr. */
 812                 nfs_nb.buf = ai->ai_addr;
 813                 nfs_nb.len = nfs_nb.maxlen = ai->ai_addrlen;
 814         } else {
 815                 /* Ask the remote rpcbind. */
 816                 nfs_nb.buf = &nfs_ss;
 817                 nfs_nb.len = nfs_nb.maxlen = sizeof nfs_ss;
 818
 819                 if (!rpcb_getaddr(NFS_PROGRAM, nfsvers, nconf, &nfs_nb,
 820                     hostp)) {
 821                         if (rpc_createerr.cf_stat == RPC_PROGVERSMISMATCH &&
 822                             trymntmode == ANY) {
 823                                 trymntmode = V2;
 824                                 goto tryagain;
 825                         }
 826                         snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s",
 827                             netid, hostp, spec,
 828                             clnt_spcreateerror("RPCPROG_NFS"));
 829                         return (returncode(rpc_createerr.cf_stat,
 830                             &rpc_createerr.cf_error));
 831                 }
 832         }
 833
 834         /* Check that the server (nfsd) responds on the port we have chosen. */
 835         clp = clnt_tli_create(RPC_ANYFD, nconf, &nfs_nb, NFS_PROGRAM, nfsvers,
 836             0, 0);
 837         if (clp == NULL) {
 838                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
 839                     hostp, spec, clnt_spcreateerror("nfsd: RPCPROG_NFS"));
 840                 return (returncode(rpc_createerr.cf_stat,
 841                     &rpc_createerr.cf_error));
 842         }
 843         if (sotype == SOCK_DGRAM && noconn == 0) {
 844                 /*
 845                  * Use connect(), to match what the kernel does. This
 846                  * catches cases where the server responds from the
 847                  * wrong source address.
 848                  */
 849                 doconnect = 1;
 850                 if (!clnt_control(clp, CLSET_CONNECT, (char *)&doconnect)) {
 851                         clnt_destroy(clp);
 852                         snprintf(errbuf, sizeof errbuf,
 853                             "[%s] %s:%s: CLSET_CONNECT failed", netid, hostp,
 854                             spec);
 855                         return (TRYRET_LOCALERR);
 856                 }
 857         }
 858
 859         try.tv_sec = 10;
 860         try.tv_usec = 0;
 861         clntstat = clnt_call(clp, NFSPROC_NULL, (xdrproc_t)xdr_void, NULL,
 862                          (xdrproc_t)xdr_void, NULL, try);
 863         if (clntstat != RPC_SUCCESS) {
 864                 if (clntstat == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
 865                         clnt_destroy(clp);
 866                         trymntmode = V2;
 867                         goto tryagain;
 868                 }
 869                 clnt_geterr(clp, &rpcerr);
 870                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
 871                     hostp, spec, clnt_sperror(clp, "NFSPROC_NULL"));
 872                 clnt_destroy(clp);
 873                 return (returncode(clntstat, &rpcerr));
 874         }
 875         clnt_destroy(clp);
 876
 877         /*
 878          * For NFSv4, there is no mount protocol.
 879          */
 880         if (trymntmode == V4) {
 881                 /*
 882                  * Store the server address in nfsargsp, making
 883                  * sure to copy any locally allocated structures.
 884                  */
 885                 addrlen = nfs_nb.len;
 886                 addr = malloc(addrlen);
 887                 if (addr == NULL)
 888                         err(1, "malloc");
 889                 bcopy(nfs_nb.buf, addr, addrlen);
 890
 891                 build_iovec(iov, iovlen, "addr", addr, addrlen);
 892                 secname = sec_num_to_name(secflavor);
 893                 if (secname != NULL) {
 894                         build_iovec(iov, iovlen, "sec",
 895                             __DECONST(void *, secname), (size_t)-1);
 896                 }
 897                 build_iovec(iov, iovlen, "nfsv4", NULL, 0);
 898                 build_iovec(iov, iovlen, "dirpath", spec, (size_t)-1);
 899
 900                 return (TRYRET_SUCCESS);
 901         }
 902
 903         /* Send the MOUNTPROC_MNT RPC to get the root filehandle. */
 904         try.tv_sec = 10;
 905         try.tv_usec = 0;
 906         clp = clnt_tp_create(hostp, MOUNTPROG, mntvers, nconf_mnt);
 907         if (clp == NULL) {
 908                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
 909                     hostp, spec, clnt_spcreateerror("RPCMNT: clnt_create"));
 910                 return (returncode(rpc_createerr.cf_stat,
 911                     &rpc_createerr.cf_error));
 912         }
 913         clp->cl_auth = authsys_create_default();
 914         nfhret.auth = secflavor;
 915         nfhret.vers = mntvers;
 916         clntstat = clnt_call(clp, MOUNTPROC_MNT, (xdrproc_t)xdr_dir, spec,
 917                          (xdrproc_t)xdr_fh, &nfhret,
 918             try);
 919         auth_destroy(clp->cl_auth);
 920         if (clntstat != RPC_SUCCESS) {
 921                 if (clntstat == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
 922                         clnt_destroy(clp);
 923                         trymntmode = V2;
 924                         goto tryagain;
 925                 }
 926                 clnt_geterr(clp, &rpcerr);
 927                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
 928                     hostp, spec, clnt_sperror(clp, "RPCPROG_MNT"));
 929                 clnt_destroy(clp);
 930                 return (returncode(clntstat, &rpcerr));
 931         }
 932         clnt_destroy(clp);
 933
 934         if (nfhret.stat != 0) {
 935                 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
 936                     hostp, spec, strerror(nfhret.stat));
 937                 return (TRYRET_REMOTEERR);
 938         }
 939
 940         /*
 941          * Store the filehandle and server address in nfsargsp, making
 942          * sure to copy any locally allocated structures.
 943          */
 944         addrlen = nfs_nb.len;
 945         addr = malloc(addrlen);
 946         fhsize = nfhret.fhsize;
 947         fh = malloc(fhsize);
 948         if (addr == NULL || fh == NULL)
 949                 err(1, "malloc");
 950         bcopy(nfs_nb.buf, addr, addrlen);
 951         bcopy(nfhret.nfh, fh, fhsize);
 952
 953         build_iovec(iov, iovlen, "addr", addr, addrlen);
 954         build_iovec(iov, iovlen, "fh", fh, fhsize);
 955         secname = sec_num_to_name(nfhret.auth);
 956         if (secname) {
 957                 build_iovec(iov, iovlen, "sec",
 958                     __DECONST(void *, secname), (size_t)-1);
 959         }
 960         if (nfsvers == 3)
 961                 build_iovec(iov, iovlen, "nfsv3", NULL, 0);
 962
 963         return (TRYRET_SUCCESS);
 964 }
 965
 966 /*
 967  * Catagorise a RPC return status and error into an `enum tryret'
 968  * return code.
 969  */
 970 static enum tryret
 971 returncode(enum clnt_stat clntstat, struct rpc_err *rpcerr)
 972 {
 973
 974         switch (clntstat) {
 975         case RPC_TIMEDOUT:
 976                 return (TRYRET_TIMEOUT);
 977         case RPC_PMAPFAILURE:
 978         case RPC_PROGNOTREGISTERED:
 979         case RPC_PROGVERSMISMATCH:
 980         /* XXX, these can be local or remote. */
 981         case RPC_CANTSEND:
 982         case RPC_CANTRECV:
 983                 return (TRYRET_REMOTEERR);
 984         case RPC_SYSTEMERROR:
 985                 switch (rpcerr->re_errno) {
 986                 case ETIMEDOUT:
 987                         return (TRYRET_TIMEOUT);
 988                 case ENOMEM:
 989                         break;
 990                 default:
 991                         return (TRYRET_REMOTEERR);
 992                 }
 993                 /* FALLTHROUGH */
 994         default:
 995                 break;
 996         }
 997         return (TRYRET_LOCALERR);
 998 }
 999
1000 /*
1001  * Look up a netid based on an address family and socket type.
1002  * `af' is the address family, and `sotype' is SOCK_DGRAM or SOCK_STREAM.
1003  *
1004  * XXX there should be a library function for this.
1005  */
1006 static const char *
1007 netidbytype(int af, int sotype)
1008 {
1009         struct nc_protos *p;
1010
1011         for (p = nc_protos; p->netid != NULL; p++) {
1012                 if (af != p->af || sotype != p->sotype)
1013                         continue;
1014                 return (p->netid);
1015         }
1016         return (NULL);
1017 }
1018
1019 /*
1020  * Look up a netconfig entry based on a netid, and cache the result so
1021  * that we don't need to remember to call freenetconfigent().
1022  *
1023  * Otherwise it behaves just like getnetconfigent(), so nc_*error()
1024  * work on failure.
1025  */
1026 static struct netconfig *
1027 getnetconf_cached(const char *netid)
1028 {
1029         static struct nc_entry {
1030                 struct netconfig *nconf;
1031                 struct nc_entry *next;
1032         } *head;
1033         struct nc_entry *p;
1034         struct netconfig *nconf;
1035
1036         for (p = head; p != NULL; p = p->next)
1037                 if (strcmp(netid, p->nconf->nc_netid) == 0)
1038                         return (p->nconf);
1039
1040         if ((nconf = getnetconfigent(netid)) == NULL)
1041                 return (NULL);
1042         if ((p = malloc(sizeof(*p))) == NULL)
1043                 err(1, "malloc");
1044         p->nconf = nconf;
1045         p->next = head;
1046         head = p;
1047
1048         return (p->nconf);
1049 }
1050
1051 /*
1052  * xdr routines for mount rpc's
1053  */
1054 static int
1055 xdr_dir(XDR *xdrsp, char *dirp)
1056 {
1057         return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
1058 }
1059
1060 static int
1061 xdr_fh(XDR *xdrsp, struct nfhret *np)
1062 {
1063         int i;
1064         long auth, authcnt, authfnd = 0;
1065
1066         if (!xdr_u_long(xdrsp, &np->stat))
1067                 return (0);
1068         if (np->stat)
1069                 return (1);
1070         switch (np->vers) {
1071         case 1:
1072                 np->fhsize = NFS_FHSIZE;
1073                 return (xdr_opaque(xdrsp, (caddr_t)np->nfh, NFS_FHSIZE));
1074         case 3:
1075                 if (!xdr_long(xdrsp, &np->fhsize))
1076                         return (0);
1077                 if (np->fhsize <= 0 || np->fhsize > NFS3_FHSIZE)
1078                         return (0);
1079                 if (!xdr_opaque(xdrsp, (caddr_t)np->nfh, np->fhsize))
1080                         return (0);
1081                 if (!xdr_long(xdrsp, &authcnt))
1082                         return (0);
1083                 for (i = 0; i < authcnt; i++) {
1084                         if (!xdr_long(xdrsp, &auth))
1085                                 return (0);
1086                         if (np->auth == -1) {
1087                                 np->auth = auth;
1088                                 authfnd++;
1089                         } else if (auth == np->auth) {
1090                                 authfnd++;
1091                         }
1092                 }
1093                 /*
1094                  * Some servers, such as DEC's OSF/1 return a nil authenticator
1095                  * list to indicate RPCAUTH_UNIX.
1096                  */
1097                 if (authcnt == 0 && np->auth == -1)
1098                         np->auth = AUTH_SYS;
1099                 if (!authfnd && (authcnt > 0 || np->auth != AUTH_SYS))
1100                         np->stat = EAUTH;
1101                 return (1);
1102         }
1103         return (0);
1104 }
1105
1106 static void
1107 usage(void)
1108 {
1109         (void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
1110 "usage: mount_nfs [-23bcdiLlNPsTU] [-a maxreadahead] [-D deadthresh]",
1111 "                 [-g maxgroups] [-I readdirsize] [-o options] [-R retrycnt]",
1112 "                 [-r readsize] [-t timeout] [-w writesize] [-x retrans]",
1113 "                 rhost:path node");
1114         exit(1);
1115 }