utils/mount/nfs4mount.c

   1 /*
   2  * nfs4mount.c -- Linux NFS mount
   3  * Copyright (C) 2002 Trond Myklebust <trond.myklebust@fys.uio.no>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2, or (at your option)
   8  * any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * Note: this file based on the original nfsmount.c
  16  *
  17  * 2006-06-06 Amit Gud <agud@redhat.com>
  18  * - Moved to nfs-utils/utils/mount from util-linux/mount.
  19  */
  20
  21 #ifdef HAVE_CONFIG_H
  22 #include <config.h>
  23 #endif
  24
  25 #include <unistd.h>
  26 #include <stdio.h>
  27 #include <string.h>
  28 #include <errno.h>
  29 #include <netdb.h>
  30 #include <time.h>
  31 #include <sys/stat.h>
  32 #include <sys/mount.h>
  33 #include <netinet/in.h>
  34 #include <arpa/inet.h>
  35 #include <rpc/auth.h>
  36 #include <rpc/rpc.h>
  37
  38 #ifdef HAVE_RPCSVC_NFS_PROT_H
  39 #include <rpcsvc/nfs_prot.h>
  40 #else
  41 #include <linux/nfs.h>
  42 #define nfsstat nfs_stat
  43 #endif
  44
  45 #include "pseudoflavors.h"
  46 #include "nls.h"
  47 #include "xcommon.h"
  48
  49 #include "mount.h"
  50 #include "mount_constants.h"
  51 #include "nfs4_mount.h"
  52 #include "nfs_mount.h"
  53 #include "error.h"
  54 #include "network.h"
  55
  56 #if defined(VAR_LOCK_DIR)
  57 #define DEFAULT_DIR VAR_LOCK_DIR
  58 #else
  59 #define DEFAULT_DIR "/var/lock/subsys"
  60 #endif
  61
  62 extern char *progname;
  63 extern int verbose;
  64 extern int sloppy;
  65
  66 char *IDMAPLCK = DEFAULT_DIR "/rpcidmapd";
  67 #define idmapd_check() do { \
  68         if (access(IDMAPLCK, F_OK)) { \
  69                 printf(_("Warning: rpc.idmapd appears not to be running.\n" \
  70                         "         All uids will be mapped to the nobody uid.\n")); \
  71         } \
  72 } while(0);
  73
  74 char *GSSDLCK = DEFAULT_DIR "/rpcgssd";
  75 #define gssd_check() do { \
  76                 if (access(GSSDLCK, F_OK)) { \
  77                         printf(_("Warning: rpc.gssd appears not to be running.\n")); \
  78                 } \
  79 } while(0);
  80
  81 #ifndef NFS_PORT
  82 #define NFS_PORT 2049
  83 #endif
  84
  85 #define MAX_USER_FLAVOUR        16
  86
  87 static int parse_sec(char *sec, int *pseudoflavour)
  88 {
  89         int i, num_flavour = 0;
  90
  91         for (sec = strtok(sec, ":"); sec; sec = strtok(NULL, ":")) {
  92                 if (num_flavour >= MAX_USER_FLAVOUR) {
  93                         nfs_error(_("%s: maximum number of security flavors "
  94                                   "exceeded"), progname);
  95                         return 0;
  96                 }
  97                 for (i = 0; i < flav_map_size; i++) {
  98                         if (strcmp(sec, flav_map[i].flavour) == 0) {
  99                                 pseudoflavour[num_flavour++] = flav_map[i].fnum;
 100                                 break;
 101                         }
 102                 }
 103                 if (i == flav_map_size) {
 104                         nfs_error(_("%s: unknown security type %s\n"),
 105                                         progname, sec);
 106                         return 0;
 107                 }
 108         }
 109         if (!num_flavour)
 110                 nfs_error(_("%s: no security flavors passed to sec= option"),
 111                                 progname);
 112         return num_flavour;
 113 }
 114
 115 static int parse_devname(char *hostdir, char **hostname, char **dirname)
 116 {
 117         char *s;
 118
 119         if (!(s = strchr(hostdir, ':'))) {
 120                 nfs_error(_("%s: directory to mount not in host:dir format"),
 121                                 progname);
 122                 return -1;
 123         }
 124         *hostname = hostdir;
 125         *dirname = s + 1;
 126         *s = '\0';
 127         /* Ignore all but first hostname in replicated mounts
 128            until they can be fully supported. (mack@sgi.com) */
 129         if ((s = strchr(hostdir, ','))) {
 130                 *s = '\0';
 131                 nfs_error(_("%s: warning: multiple hostnames not supported"),
 132                                 progname);
 133         }
 134         return 0;
 135 }
 136
 137 static int fill_ipv4_sockaddr(const char *hostname, struct sockaddr_in *addr)
 138 {
 139         struct hostent *hp;
 140         addr->sin_family = AF_INET;
 141
 142         if (inet_aton(hostname, &addr->sin_addr))
 143                 return 0;
 144         if ((hp = gethostbyname(hostname)) == NULL) {
 145                 nfs_error(_("%s: can't get address for %s\n"),
 146                                 progname, hostname);
 147                 return -1;
 148         }
 149         if (hp->h_length > sizeof(struct in_addr)) {
 150                 nfs_error(_("%s: got bad hp->h_length"), progname);
 151                 hp->h_length = sizeof(struct in_addr);
 152         }
 153         memcpy(&addr->sin_addr, hp->h_addr, hp->h_length);
 154         return 0;
 155 }
 156
 157 static int get_my_ipv4addr(char *ip_addr, int len)
 158 {
 159         char myname[1024];
 160         struct sockaddr_in myaddr;
 161
 162         if (gethostname(myname, sizeof(myname))) {
 163                 nfs_error(_("%s: can't determine client address\n"),
 164                                 progname);
 165                 return -1;
 166         }
 167         if (fill_ipv4_sockaddr(myname, &myaddr))
 168                 return -1;
 169         snprintf(ip_addr, len, "%s", inet_ntoa(myaddr.sin_addr));
 170         ip_addr[len-1] = '\0';
 171         return 0;
 172 }
 173
 174 int nfs4mount(const char *spec, const char *node, int flags,
 175               char **extra_opts, int fake, int running_bg)
 176 {
 177         static struct nfs4_mount_data data;
 178         static char hostdir[1024];
 179         static char ip_addr[16] = "127.0.0.1";
 180         static struct sockaddr_in server_addr, client_addr;
 181         static int pseudoflavour[MAX_USER_FLAVOUR];
 182         int num_flavour = 0;
 183         int ip_addr_in_opts = 0;
 184
 185         char *hostname, *dirname, *old_opts;
 186         char new_opts[1024];
 187         char *opt, *opteq;
 188         char *s;
 189         int val;
 190         int bg, soft, intr;
 191         int nocto, noac, unshared;
 192         int retry;
 193         int retval = EX_FAIL;
 194         time_t timeout, t;
 195
 196         if (strlen(spec) >= sizeof(hostdir)) {
 197                 nfs_error(_("%s: excessively long host:dir argument\n"),
 198                                 progname);
 199                 goto fail;
 200         }
 201         strcpy(hostdir, spec);
 202         if (parse_devname(hostdir, &hostname, &dirname))
 203                 goto fail;
 204
 205         if (fill_ipv4_sockaddr(hostname, &server_addr))
 206                 goto fail;
 207         if (get_my_ipv4addr(ip_addr, sizeof(ip_addr)))
 208                 goto fail;
 209
 210         /* add IP address to mtab options for use when unmounting */
 211         s = inet_ntoa(server_addr.sin_addr);
 212         old_opts = *extra_opts;
 213         if (!old_opts)
 214                 old_opts = "";
 215         if (strlen(old_opts) + strlen(s) + 10 >= sizeof(new_opts)) {
 216                 nfs_error(_("%s: excessively long option argument\n"),
 217                                 progname);
 218                 goto fail;
 219         }
 220         snprintf(new_opts, sizeof(new_opts), "%s%saddr=%s",
 221                  old_opts, *old_opts ? "," : "", s);
 222         *extra_opts = xstrdup(new_opts);
 223
 224         /* Set default options.
 225          * rsize/wsize and timeo are left 0 in order to
 226          * let the kernel decide.
 227          */
 228         memset(&data, 0, sizeof(data));
 229         data.retrans    = 3;
 230         data.acregmin   = 3;
 231         data.acregmax   = 60;
 232         data.acdirmin   = 30;
 233         data.acdirmax   = 60;
 234         data.proto      = IPPROTO_TCP;
 235
 236         bg = 0;
 237         soft = 0;
 238         intr = NFS4_MOUNT_INTR;
 239         nocto = 0;
 240         noac = 0;
 241         unshared = 0;
 242         retry = -1;
 243
 244         /*
 245          * NFSv4 specifies that the default port should be 2049
 246          */
 247         server_addr.sin_port = htons(NFS_PORT);
 248
 249         /* parse options */
 250
 251         for (opt = strtok(old_opts, ","); opt; opt = strtok(NULL, ",")) {
 252                 if ((opteq = strchr(opt, '='))) {
 253                         val = atoi(opteq + 1);
 254                         *opteq = '\0';
 255                         if (!strcmp(opt, "rsize"))
 256                                 data.rsize = val;
 257                         else if (!strcmp(opt, "wsize"))
 258                                 data.wsize = val;
 259                         else if (!strcmp(opt, "timeo"))
 260                                 data.timeo = val;
 261                         else if (!strcmp(opt, "retrans"))
 262                                 data.retrans = val;
 263                         else if (!strcmp(opt, "acregmin"))
 264                                 data.acregmin = val;
 265                         else if (!strcmp(opt, "acregmax"))
 266                                 data.acregmax = val;
 267                         else if (!strcmp(opt, "acdirmin"))
 268                                 data.acdirmin = val;
 269                         else if (!strcmp(opt, "acdirmax"))
 270                                 data.acdirmax = val;
 271                         else if (!strcmp(opt, "actimeo")) {
 272                                 data.acregmin = val;
 273                                 data.acregmax = val;
 274                                 data.acdirmin = val;
 275                                 data.acdirmax = val;
 276                         }
 277                         else if (!strcmp(opt, "retry"))
 278                                 retry = val;
 279                         else if (!strcmp(opt, "port"))
 280                                 server_addr.sin_port = htons(val);
 281                         else if (!strcmp(opt, "proto")) {
 282                                 if (!strncmp(opteq+1, "tcp", 3))
 283                                         data.proto = IPPROTO_TCP;
 284                                 else if (!strncmp(opteq+1, "udp", 3))
 285                                         data.proto = IPPROTO_UDP;
 286                                 else
 287                                         printf(_("Warning: Unrecognized proto= option.\n"));
 288                         } else if (!strcmp(opt, "clientaddr")) {
 289                                 if (strlen(opteq+1) >= sizeof(ip_addr))
 290                                         printf(_("Invalid client address %s"),
 291                                                                 opteq+1);
 292                                 strncpy(ip_addr,opteq+1, sizeof(ip_addr));
 293                                 ip_addr[sizeof(ip_addr)-1] = '\0';
 294                                 ip_addr_in_opts = 1;
 295                         } else if (!strcmp(opt, "sec")) {
 296                                 num_flavour = parse_sec(opteq+1, pseudoflavour);
 297                                 if (!num_flavour)
 298                                         goto fail;
 299                         } else if (!strcmp(opt, "addr") || sloppy) {
 300                                 /* ignore */;
 301                         } else {
 302                                 printf(_("unknown nfs mount parameter: "
 303                                          "%s=%d\n"), opt, val);
 304                                 goto fail;
 305                         }
 306                 } else {
 307                         val = 1;
 308                         if (!strncmp(opt, "no", 2)) {
 309                                 val = 0;
 310                                 opt += 2;
 311                         }
 312                         if (!strcmp(opt, "bg"))
 313                                 bg = val;
 314                         else if (!strcmp(opt, "fg"))
 315                                 bg = !val;
 316                         else if (!strcmp(opt, "soft"))
 317                                 soft = val;
 318                         else if (!strcmp(opt, "hard"))
 319                                 soft = !val;
 320                         else if (!strcmp(opt, "intr"))
 321                                 intr = val;
 322                         else if (!strcmp(opt, "cto"))
 323                                 nocto = !val;
 324                         else if (!strcmp(opt, "ac"))
 325                                 noac = !val;
 326                         else if (!strcmp(opt, "sharecache"))
 327                                 unshared = !val;
 328                         else if (!sloppy) {
 329                                 printf(_("unknown nfs mount option: %s%s\n"),
 330                                                 val ? "" : "no", opt);
 331                                 goto fail;
 332                         }
 333                 }
 334         }
 335
 336         /* if retry is still -1, then it wasn't set via an option */
 337         if (retry == -1) {
 338                 if (bg)
 339                         retry = 10000;  /* 10000 mins == ~1 week */
 340                 else
 341                         retry = 2;      /* 2 min default on fg mounts */
 342         }
 343
 344         data.flags = (soft ? NFS4_MOUNT_SOFT : 0)
 345                 | (intr ? NFS4_MOUNT_INTR : 0)
 346                 | (nocto ? NFS4_MOUNT_NOCTO : 0)
 347                 | (noac ? NFS4_MOUNT_NOAC : 0)
 348                 | (unshared ? NFS4_MOUNT_UNSHARED : 0);
 349
 350         /*
 351          * Give a warning if the rpc.idmapd daemon is not running
 352          */
 353 #if 0
 354         /* We shouldn't have these checks as nothing in this package
 355          * creates the files that are checked
 356          */
 357         idmapd_check();
 358
 359         if (num_flavour == 0)
 360                 pseudoflavour[num_flavour++] = AUTH_UNIX;
 361         else {
 362                 /*
 363                  * ditto with rpc.gssd daemon
 364                  */
 365                 gssd_check();
 366         }
 367 #endif
 368         data.auth_flavourlen = num_flavour;
 369         data.auth_flavours = pseudoflavour;
 370
 371         data.client_addr.data = ip_addr;
 372         data.client_addr.len = strlen(ip_addr);
 373
 374         data.mnt_path.data = dirname;
 375         data.mnt_path.len = strlen(dirname);
 376
 377         data.hostname.data = hostname;
 378         data.hostname.len = strlen(hostname);
 379         data.host_addr = (struct sockaddr *)&server_addr;
 380         data.host_addrlen = sizeof(server_addr);
 381
 382 #ifdef NFS_MOUNT_DEBUG
 383         printf(_("rsize = %d, wsize = %d, timeo = %d, retrans = %d\n"),
 384                data.rsize, data.wsize, data.timeo, data.retrans);
 385         printf(_("acreg (min, max) = (%d, %d), acdir (min, max) = (%d, %d)\n"),
 386                data.acregmin, data.acregmax, data.acdirmin, data.acdirmax);
 387         printf(_("port = %d, bg = %d, retry = %d, flags = %.8x\n"),
 388                ntohs(server_addr.sin_port), bg, retry, data.flags);
 389         printf(_("soft = %d, intr = %d, nocto = %d, noac = %d, "
 390                "nosharecache = %d\n"),
 391                (data.flags & NFS4_MOUNT_SOFT) != 0,
 392                (data.flags & NFS4_MOUNT_INTR) != 0,
 393                (data.flags & NFS4_MOUNT_NOCTO) != 0,
 394                (data.flags & NFS4_MOUNT_NOAC) != 0,
 395                (data.flags & NFS4_MOUNT_UNSHARED) != 0);
 396
 397         if (num_flavour > 0) {
 398                 int pf_cnt, i;
 399
 400                 printf(_("sec = "));
 401                 for (pf_cnt = 0; pf_cnt < num_flavour; pf_cnt++) {
 402                         for (i = 0; i < flav_map_size; i++) {
 403                                 if (flav_map[i].fnum == pseudoflavour[pf_cnt]) {
 404                                         printf("%s", flav_map[i].flavour);
 405                                         break;
 406                                 }
 407                         }
 408                         printf("%s", (pf_cnt < num_flavour-1) ? ":" : "\n");
 409                 }
 410         }
 411         printf(_("proto = %s\n"), (data.proto == IPPROTO_TCP) ? _("tcp") : _("udp"));
 412 #endif
 413
 414         timeout = time(NULL) + 60 * retry;
 415         data.version = NFS4_MOUNT_VERSION;
 416         for (;;) {
 417                 if (verbose) {
 418                         printf(_("%s: pinging: prog %d vers %d prot %s port %d\n"),
 419                                 progname, NFS_PROGRAM, 4,
 420                                 data.proto == IPPROTO_UDP ? "udp" : "tcp",
 421                                 ntohs(server_addr.sin_port));
 422                 }
 423                 client_addr.sin_family = 0;
 424                 client_addr.sin_addr.s_addr = 0;
 425                 clnt_ping(&server_addr, NFS_PROGRAM, 4, data.proto, &client_addr);
 426                 if (rpc_createerr.cf_stat == RPC_SUCCESS) {
 427                         if (!ip_addr_in_opts &&
 428                             client_addr.sin_family != 0 &&
 429                             client_addr.sin_addr.s_addr != 0) {
 430                                 snprintf(ip_addr, sizeof(ip_addr), "%s",
 431                                          inet_ntoa(client_addr.sin_addr));
 432                                 data.client_addr.len = strlen(ip_addr);
 433                         }
 434                         break;
 435                 }
 436
 437                 switch(rpc_createerr.cf_stat){
 438                 case RPC_TIMEDOUT:
 439                         break;
 440                 case RPC_SYSTEMERROR:
 441                         if (errno == ETIMEDOUT)
 442                                 break;
 443                 default:
 444                         rpc_mount_errors(hostname, 0, bg);
 445                         goto fail;
 446                 }
 447
 448                 if (bg && !running_bg) {
 449                         if (retry > 0)
 450                                 retval = EX_BG;
 451                         goto fail;
 452                 }
 453
 454                 t = time(NULL);
 455                 if (t >= timeout) {
 456                         rpc_mount_errors(hostname, 0, bg);
 457                         goto fail;
 458                 }
 459                 rpc_mount_errors(hostname, 1, bg);
 460                 continue;
 461         }
 462
 463         if (!fake) {
 464                 if (mount(spec, node, "nfs4",
 465                                 flags & ~(MS_USER|MS_USERS), &data)) {
 466                         mount_error(spec, node, errno);
 467                         goto fail;
 468                 }
 469         }
 470
 471         return EX_SUCCESS;
 472
 473 fail:
 474         return retval;
 475 }