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