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 <netinet/in.h>
  29 #include <arpa/inet.h>
  30 #include <rpc/auth.h>
  31 #include <rpc/rpc.h>
  32 #ifdef HAVE_RPCSVC_NFS_PROT_H
  33 #include <rpcsvc/nfs_prot.h>
  34 #else
  35 #include <linux/nfs.h>
  36 #define nfsstat nfs_stat
  37 #endif
  38
  39 #include "nls.h"
  40 #include "conn.h"
  41 #include "xcommon.h"
  42
  43 #include "nfs4_mount.h"
  44 #include "nfs_mount.h"
  45
  46 #if defined(VAR_LOCK_DIR)
  47 #define DEFAULT_DIR VAR_LOCK_DIR
  48 #else
  49 #define DEFAULT_DIR "/var/lock/subsys"
  50 #endif
  51
  52 extern int verbose;
  53 extern int sloppy;
  54
  55 char *IDMAPLCK = DEFAULT_DIR "/rpcidmapd";
  56 #define idmapd_check() do { \
  57         if (access(IDMAPLCK, F_OK)) { \
  58                 printf(_("Warning: rpc.idmapd appears not to be running.\n" \
  59                         "         All uids will be mapped to the nobody uid.\n")); \
  60         } \
  61 } while(0);
  62
  63 char *GSSDLCK = DEFAULT_DIR "/rpcgssd";
  64 #define gssd_check() do { \
  65                 if (access(GSSDLCK, F_OK)) { \
  66                         printf(_("Warning: rpc.gssd appears not to be running.\n")); \
  67                 } \
  68 } while(0);
  69
  70 #ifndef NFS_PORT
  71 #define NFS_PORT 2049
  72 #endif
  73
  74 struct {
  75         char    *flavour;
  76         int     fnum;
  77 } flav_map[] = {
  78         { "krb5",       RPC_AUTH_GSS_KRB5       },
  79         { "krb5i",      RPC_AUTH_GSS_KRB5I      },
  80         { "krb5p",      RPC_AUTH_GSS_KRB5P      },
  81         { "lipkey",     RPC_AUTH_GSS_LKEY       },
  82         { "lipkey-i",   RPC_AUTH_GSS_LKEYI      },
  83         { "lipkey-p",   RPC_AUTH_GSS_LKEYP      },
  84         { "spkm3",      RPC_AUTH_GSS_SPKM       },
  85         { "spkm3i",     RPC_AUTH_GSS_SPKMI      },
  86         { "spkm3p",     RPC_AUTH_GSS_SPKMP      },
  87         { "unix",       AUTH_UNIX               },
  88         { "sys",        AUTH_SYS                },
  89         { "null",       AUTH_NULL               },
  90         { "none",       AUTH_NONE               },
  91 };
  92
  93 #define FMAPSIZE                (sizeof(flav_map)/sizeof(flav_map[0]))
  94 #define MAX_USER_FLAVOUR        16
  95
  96 static int parse_sec(char *sec, int *pseudoflavour)
  97 {
  98         int i, num_flavour = 0;
  99
 100         for (sec = strtok(sec, ":"); sec; sec = strtok(NULL, ":")) {
 101                 if (num_flavour >= MAX_USER_FLAVOUR) {
 102                         fprintf(stderr,
 103                                 _("mount: maximum number of security flavors "
 104                                   "exceeded\n"));
 105                         return 0;
 106                 }
 107                 for (i = 0; i < FMAPSIZE; i++) {
 108                         if (strcmp(sec, flav_map[i].flavour) == 0) {
 109                                 pseudoflavour[num_flavour++] = flav_map[i].fnum;
 110                                 break;
 111                         }
 112                 }
 113                 if (i == FMAPSIZE) {
 114                         fprintf(stderr,
 115                                 _("mount: unknown security type %s\n"), sec);
 116                         return 0;
 117                 }
 118         }
 119         if (!num_flavour)
 120                 fprintf(stderr,
 121                         _("mount: no security flavors passed to sec= option\n"));
 122         return num_flavour;
 123 }
 124
 125 static int parse_devname(char *hostdir, char **hostname, char **dirname)
 126 {
 127         char *s;
 128
 129         if (!(s = strchr(hostdir, ':'))) {
 130                 fprintf(stderr,
 131                         _("mount: "
 132                           "directory to mount not in host:dir format\n"));
 133                 return -1;
 134         }
 135         *hostname = hostdir;
 136         *dirname = s + 1;
 137         *s = '\0';
 138         /* Ignore all but first hostname in replicated mounts
 139            until they can be fully supported. (mack@sgi.com) */
 140         if ((s = strchr(hostdir, ','))) {
 141                 *s = '\0';
 142                 fprintf(stderr,
 143                         _("mount: warning: "
 144                           "multiple hostnames not supported\n"));
 145         }
 146         return 0;
 147 }
 148
 149 static int fill_ipv4_sockaddr(const char *hostname, struct sockaddr_in *addr)
 150 {
 151         struct hostent *hp;
 152         addr->sin_family = AF_INET;
 153
 154         if (inet_aton(hostname, &addr->sin_addr))
 155                 return 0;
 156         if ((hp = gethostbyname(hostname)) == NULL) {
 157                 fprintf(stderr, _("mount: can't get address for %s\n"),
 158                         hostname);
 159                 return -1;
 160         }
 161         if (hp->h_length > sizeof(struct in_addr)) {
 162                 fprintf(stderr,
 163                         _("mount: got bad hp->h_length\n"));
 164                 hp->h_length = sizeof(struct in_addr);
 165         }
 166         memcpy(&addr->sin_addr, hp->h_addr, hp->h_length);
 167         return 0;
 168 }
 169
 170 static int get_my_ipv4addr(char *ip_addr, int len)
 171 {
 172         char myname[1024];
 173         struct sockaddr_in myaddr;
 174
 175         if (gethostname(myname, sizeof(myname))) {
 176                 fprintf(stderr, _("mount: can't determine client address\n"));
 177                 return -1;
 178         }
 179         if (fill_ipv4_sockaddr(myname, &myaddr))
 180                 return -1;
 181         snprintf(ip_addr, len, "%s", inet_ntoa(myaddr.sin_addr));
 182         ip_addr[len-1] = '\0';
 183         return 0;
 184 }
 185
 186 int nfs4mount(const char *spec, const char *node, int *flags,
 187               char **extra_opts, char **mount_opts,
 188               int running_bg)
 189 {
 190         static struct nfs4_mount_data data;
 191         static char hostdir[1024];
 192         static char ip_addr[16] = "127.0.0.1";
 193         static struct sockaddr_in server_addr, client_addr;
 194         static int pseudoflavour[MAX_USER_FLAVOUR];
 195         int num_flavour = 0;
 196         int ip_addr_in_opts = 0;
 197
 198         char *hostname, *dirname, *old_opts;
 199         char new_opts[1024];
 200         char *opt, *opteq;
 201         char *s;
 202         int val;
 203         int bg, soft, intr;
 204         int nocto, noac;
 205         int retry;
 206         int retval;
 207         time_t timeout, t;
 208
 209         retval = EX_FAIL;
 210         if (strlen(spec) >= sizeof(hostdir)) {
 211                 fprintf(stderr, _("mount: "
 212                                   "excessively long host:dir argument\n"));
 213                 goto fail;
 214         }
 215         strcpy(hostdir, spec);
 216         if (parse_devname(hostdir, &hostname, &dirname))
 217                 goto fail;
 218
 219         if (fill_ipv4_sockaddr(hostname, &server_addr))
 220                 goto fail;
 221         if (get_my_ipv4addr(ip_addr, sizeof(ip_addr)))
 222                 goto fail;
 223
 224         /* add IP address to mtab options for use when unmounting */
 225         s = inet_ntoa(server_addr.sin_addr);
 226         old_opts = *extra_opts;
 227         if (!old_opts)
 228                 old_opts = "";
 229         if (strlen(old_opts) + strlen(s) + 10 >= sizeof(new_opts)) {
 230                 fprintf(stderr, _("mount: "
 231                                   "excessively long option argument\n"));
 232                 goto fail;
 233         }
 234         snprintf(new_opts, sizeof(new_opts), "%s%saddr=%s",
 235                  old_opts, *old_opts ? "," : "", s);
 236         *extra_opts = xstrdup(new_opts);
 237
 238         /* Set default options.
 239          * rsize/wsize and timeo are left 0 in order to
 240          * let the kernel decide.
 241          */
 242         memset(&data, 0, sizeof(data));
 243         data.retrans    = 3;
 244         data.acregmin   = 3;
 245         data.acregmax   = 60;
 246         data.acdirmin   = 30;
 247         data.acdirmax   = 60;
 248         data.proto      = IPPROTO_TCP;
 249
 250         bg = 0;
 251         soft = 0;
 252         intr = NFS4_MOUNT_INTR;
 253         nocto = 0;
 254         noac = 0;
 255         retry = 10000;          /* 10000 minutes ~ 1 week */
 256
 257         /*
 258          * NFSv4 specifies that the default port should be 2049
 259          */
 260         server_addr.sin_port = htons(NFS_PORT);
 261
 262         /* parse options */
 263
 264         for (opt = strtok(old_opts, ","); opt; opt = strtok(NULL, ",")) {
 265                 if ((opteq = strchr(opt, '='))) {
 266                         val = atoi(opteq + 1);
 267                         *opteq = '\0';
 268                         if (!strcmp(opt, "rsize"))
 269                                 data.rsize = val;
 270                         else if (!strcmp(opt, "wsize"))
 271                                 data.wsize = val;
 272                         else if (!strcmp(opt, "timeo"))
 273                                 data.timeo = val;
 274                         else if (!strcmp(opt, "retrans"))
 275                                 data.retrans = val;
 276                         else if (!strcmp(opt, "acregmin"))
 277                                 data.acregmin = val;
 278                         else if (!strcmp(opt, "acregmax"))
 279                                 data.acregmax = val;
 280                         else if (!strcmp(opt, "acdirmin"))
 281                                 data.acdirmin = val;
 282                         else if (!strcmp(opt, "acdirmax"))
 283                                 data.acdirmax = val;
 284                         else if (!strcmp(opt, "actimeo")) {
 285                                 data.acregmin = val;
 286                                 data.acregmax = val;
 287                                 data.acdirmin = val;
 288                                 data.acdirmax = val;
 289                         }
 290                         else if (!strcmp(opt, "retry"))
 291                                 retry = val;
 292                         else if (!strcmp(opt, "port"))
 293                                 server_addr.sin_port = htons(val);
 294                         else if (!strcmp(opt, "proto")) {
 295                                 if (!strncmp(opteq+1, "tcp", 3))
 296                                         data.proto = IPPROTO_TCP;
 297                                 else if (!strncmp(opteq+1, "udp", 3))
 298                                         data.proto = IPPROTO_UDP;
 299                                 else
 300                                         printf(_("Warning: Unrecognized proto= option.\n"));
 301                         } else if (!strcmp(opt, "clientaddr")) {
 302                                 if (strlen(opteq+1) >= sizeof(ip_addr))
 303                                         printf(_("Invalid client address %s"),
 304                                                                 opteq+1);
 305                                 strncpy(ip_addr,opteq+1, sizeof(ip_addr));
 306                                 ip_addr[sizeof(ip_addr)-1] = '\0';
 307                                 ip_addr_in_opts = 1;
 308                         } else if (!strcmp(opt, "sec")) {
 309                                 num_flavour = parse_sec(opteq+1, pseudoflavour);
 310                                 if (!num_flavour)
 311                                         goto fail;
 312                         } else if (!strcmp(opt, "addr") || sloppy) {
 313                                 /* ignore */;
 314                         } else {
 315                                 printf(_("unknown nfs mount parameter: "
 316                                          "%s=%d\n"), opt, val);
 317                                 goto fail;
 318                         }
 319                 } else {
 320                         val = 1;
 321                         if (!strncmp(opt, "no", 2)) {
 322                                 val = 0;
 323                                 opt += 2;
 324                         }
 325                         if (!strcmp(opt, "bg"))
 326                                 bg = val;
 327                         else if (!strcmp(opt, "fg"))
 328                                 bg = !val;
 329                         else if (!strcmp(opt, "soft"))
 330                                 soft = val;
 331                         else if (!strcmp(opt, "hard"))
 332                                 soft = !val;
 333                         else if (!strcmp(opt, "intr"))
 334                                 intr = val;
 335                         else if (!strcmp(opt, "cto"))
 336                                 nocto = !val;
 337                         else if (!strcmp(opt, "ac"))
 338                                 noac = !val;
 339                         else if (!sloppy) {
 340                                 printf(_("unknown nfs mount option: "
 341                                          "%s%s\n"), val ? "" : "no", opt);
 342                                 goto fail;
 343                         }
 344                 }
 345         }
 346
 347         data.flags = (soft ? NFS4_MOUNT_SOFT : 0)
 348                 | (intr ? NFS4_MOUNT_INTR : 0)
 349                 | (nocto ? NFS4_MOUNT_NOCTO : 0)
 350                 | (noac ? NFS4_MOUNT_NOAC : 0);
 351
 352         /*
 353          * Give a warning if the rpc.idmapd daemon is not running
 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         data.auth_flavourlen = num_flavour;
 366         data.auth_flavours = pseudoflavour;
 367
 368         data.client_addr.data = ip_addr;
 369         data.client_addr.len = strlen(ip_addr);
 370
 371         data.mnt_path.data = dirname;
 372         data.mnt_path.len = strlen(dirname);
 373
 374         data.hostname.data = hostname;
 375         data.hostname.len = strlen(hostname);
 376         data.host_addr = (struct sockaddr *)&server_addr;
 377         data.host_addrlen = sizeof(server_addr);
 378
 379 #ifdef NFS_MOUNT_DEBUG
 380         printf("rsize = %d, wsize = %d, timeo = %d, retrans = %d\n",
 381                data.rsize, data.wsize, data.timeo, data.retrans);
 382         printf("acreg (min, max) = (%d, %d), acdir (min, max) = (%d, %d)\n",
 383                data.acregmin, data.acregmax, data.acdirmin, data.acdirmax);
 384         printf("port = %d, bg = %d, retry = %d, flags = %.8x\n",
 385                ntohs(server_addr.sin_port), bg, retry, data.flags);
 386         printf("soft = %d, intr = %d, nocto = %d, noac = %d\n",
 387                (data.flags & NFS4_MOUNT_SOFT) != 0,
 388                (data.flags & NFS4_MOUNT_INTR) != 0,
 389                (data.flags & NFS4_MOUNT_NOCTO) != 0,
 390                (data.flags & NFS4_MOUNT_NOAC) != 0);
 391
 392         if (num_flavour > 0) {
 393                 int pf_cnt, i;
 394
 395                 printf("sec = ");
 396                 for (pf_cnt = 0; pf_cnt < num_flavour; pf_cnt++) {
 397                         for (i = 0; i < FMAPSIZE; i++) {
 398                                 if (flav_map[i].fnum == pseudoflavour[pf_cnt]) {
 399                                         printf("%s", flav_map[i].flavour);
 400                                         break;
 401                                 }
 402                         }
 403                         printf("%s", (pf_cnt < num_flavour-1) ? ":" : "\n");
 404                 }
 405         }
 406         printf("proto = %s\n", (data.proto == IPPROTO_TCP) ? "tcp" : "udp");
 407 #endif
 408
 409         timeout = time(NULL) + 60 * retry;
 410         data.version = NFS4_MOUNT_VERSION;
 411         for (;;) {
 412                 if (verbose) {
 413                         fprintf(stderr,
 414                                 "mount: pinging: prog %d vers %d prot %s port %d\n",
 415                                 NFS_PROGRAM, 4, data.proto == IPPROTO_UDP ? "udp" : "tcp",
 416                                 ntohs(server_addr.sin_port));
 417                 }
 418                 client_addr.sin_family = 0;
 419                 client_addr.sin_addr.s_addr = 0;
 420                 clnt_ping(&server_addr, NFS_PROGRAM, 4, data.proto, &client_addr);
 421                 if (rpc_createerr.cf_stat == RPC_SUCCESS) {
 422                         if (!ip_addr_in_opts &&
 423                             client_addr.sin_family != 0 &&
 424                             client_addr.sin_addr.s_addr != 0) {
 425                                 snprintf(ip_addr, sizeof(ip_addr), "%s",
 426                                          inet_ntoa(client_addr.sin_addr));
 427                                 data.client_addr.len = strlen(ip_addr);
 428                         }
 429                         break;
 430                 }
 431
 432                 switch(rpc_createerr.cf_stat){
 433                 case RPC_TIMEDOUT:
 434                         break;
 435                 case RPC_SYSTEMERROR:
 436                         if (errno == ETIMEDOUT)
 437                                 break;
 438                 default:
 439                         mount_errors(hostname, 0, bg);
 440                         goto fail;
 441                 }
 442                 t = time(NULL);
 443                 if (t >= timeout) {
 444                         mount_errors(hostname, 0, bg);
 445                         goto fail;
 446                 }
 447                 mount_errors(hostname, 1, bg);
 448                 continue;
 449         }
 450
 451         *mount_opts = (char *) &data;
 452         /* clean up */
 453         return 0;
 454
 455 fail:
 456         return retval;
 457 }