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