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