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