utils/mountd/cache.c

   1
   2 /*
   3  * Handle communication with knfsd internal cache
   4  *
   5  * We open /proc/net/rpc/{auth.unix.ip,nfsd.export,nfsd.fh}/channel
   6  * and listen for requests (using my_svc_run)
   7  *
   8  */
   9
  10 #ifdef HAVE_CONFIG_H
  11 #include <config.h>
  12 #endif
  13
  14 #include <sys/types.h>
  15 #include <sys/select.h>
  16 #include <sys/stat.h>
  17 #include <time.h>
  18 #include <netinet/in.h>
  19 #include <arpa/inet.h>
  20 #include <unistd.h>
  21 #include <fcntl.h>
  22 #include <errno.h>
  23 #include <ctype.h>
  24 #include <pwd.h>
  25 #include <grp.h>
  26 #include <mntent.h>
  27 #include "misc.h"
  28 #include "nfslib.h"
  29 #include "exportfs.h"
  30 #include "mountd.h"
  31 #include "xmalloc.h"
  32 #include "fsloc.h"
  33 #include "pseudoflavors.h"
  34
  35 #ifdef USE_BLKID
  36 #include "blkid/blkid.h"
  37 #endif
  38
  39
  40 enum nfsd_fsid {
  41         FSID_DEV = 0,
  42         FSID_NUM,
  43         FSID_MAJOR_MINOR,
  44         FSID_ENCODE_DEV,
  45         FSID_UUID4_INUM,
  46         FSID_UUID8,
  47         FSID_UUID16,
  48         FSID_UUID16_INUM,
  49 };
  50
  51 /*
  52  * Support routines for text-based upcalls.
  53  * Fields are separated by spaces.
  54  * Fields are either mangled to quote space tab newline slosh with slosh
  55  * or a hexified with a leading \x
  56  * Record is terminated with newline.
  57  *
  58  */
  59 int cache_export_ent(char *domain, struct exportent *exp, char *p);
  60
  61
  62 char *lbuf  = NULL;
  63 int lbuflen = 0;
  64 extern int use_ipaddr;
  65
  66 void auth_unix_ip(FILE *f)
  67 {
  68         /* requests are
  69          *  class IP-ADDR
  70          * Ignore if class != "nfsd"
  71          * Otherwise find domainname and write back:
  72          *
  73          *  "nfsd" IP-ADDR expiry domainname
  74          */
  75         char *cp;
  76         char class[20];
  77         char ipaddr[20];
  78         char *client = NULL;
  79         struct in_addr addr;
  80         struct hostent *he = NULL;
  81         if (readline(fileno(f), &lbuf, &lbuflen) != 1)
  82                 return;
  83
  84         xlog(D_CALL, "auth_unix_ip: inbuf '%s'", lbuf);
  85
  86         cp = lbuf;
  87
  88         if (qword_get(&cp, class, 20) <= 0 ||
  89             strcmp(class, "nfsd") != 0)
  90                 return;
  91
  92         if (qword_get(&cp, ipaddr, 20) <= 0)
  93                 return;
  94
  95         if (inet_aton(ipaddr, &addr)==0)
  96                 return;
  97
  98         auth_reload();
  99
 100         /* addr is a valid, interesting address, find the domain name... */
 101         if (!use_ipaddr) {
 102                 he = client_resolve(addr);
 103                 client = client_compose(he);
 104         }
 105
 106         qword_print(f, "nfsd");
 107         qword_print(f, ipaddr);
 108         qword_printint(f, time(0)+30*60);
 109         if (use_ipaddr)
 110                 qword_print(f, ipaddr);
 111         else if (client)
 112                 qword_print(f, *client?client:"DEFAULT");
 113         qword_eol(f);
 114         xlog(D_CALL, "auth_unix_ip: client %p '%s'", client, *client?client: "DEFAULT");
 115
 116         if (client) free(client);
 117         free(he);
 118 }
 119
 120 void auth_unix_gid(FILE *f)
 121 {
 122         /* Request are
 123          *  uid
 124          * reply is
 125          *  uid expiry count list of group ids
 126          */
 127         int uid;
 128         struct passwd *pw;
 129         gid_t glist[100], *groups = glist;
 130         int ngroups = 100;
 131         int rv, i;
 132         char *cp;
 133
 134         if (readline(fileno(f), &lbuf, &lbuflen) != 1)
 135                 return;
 136
 137         cp = lbuf;
 138         if (qword_get_int(&cp, &uid) != 0)
 139                 return;
 140
 141         pw = getpwuid(uid);
 142         if (!pw)
 143                 rv = -1;
 144         else {
 145                 rv = getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
 146                 if (rv == -1 && ngroups >= 100) {
 147                         groups = malloc(sizeof(gid_t)*ngroups);
 148                         if (!groups)
 149                                 rv = -1;
 150                         else
 151                                 rv = getgrouplist(pw->pw_name, pw->pw_gid,
 152                                                   groups, &ngroups);
 153                 }
 154         }
 155         qword_printint(f, uid);
 156         qword_printint(f, time(0)+30*60);
 157         if (rv >= 0) {
 158                 qword_printint(f, ngroups);
 159                 for (i=0; i<ngroups; i++)
 160                         qword_printint(f, groups[i]);
 161         }
 162         qword_eol(f);
 163         if (groups != glist)
 164                 free(groups);
 165 }
 166
 167 #if USE_BLKID
 168 int get_uuid(char *path, char *uuid, int uuidlen, char *u)
 169 {
 170         /* extract hex digits from uuidstr and compose a uuid
 171          * of the given length (max 16), xoring bytes to make
 172          * a smaller uuid.  Then compare with uuid
 173          */
 174         int i = 0;
 175         const char *val;
 176
 177         if (path) {
 178                 static blkid_cache cache = NULL;
 179                 struct stat stb;
 180                 char *devname;
 181                 blkid_tag_iterate iter;
 182                 blkid_dev dev;
 183                 const char *type;
 184                 if (cache == NULL)
 185                         blkid_get_cache(&cache, NULL);
 186
 187                 blkid_probe_all_new(cache);
 188
 189                 if (stat(path, &stb) != 0)
 190                         return 0;
 191                 devname = blkid_devno_to_devname(stb.st_dev);
 192                 if (!devname)
 193                         return 0;
 194                 dev = blkid_get_dev(cache, devname, BLKID_DEV_NORMAL);
 195                 free(devname);
 196                 if (!dev)
 197                         return 0;
 198                 iter = blkid_tag_iterate_begin(dev);
 199                 if (!iter)
 200                         return 0;
 201                 while (blkid_tag_next(iter, &type, &val) == 0)
 202                         if (strcmp(type, "UUID") == 0)
 203                                 break;
 204                 blkid_tag_iterate_end(iter);
 205                 if (!type)
 206                         return 0;
 207         } else {
 208                 val = uuid;
 209         }
 210
 211         memset(u, 0, uuidlen);
 212         for ( ; *val ; val++) {
 213                 char c = *val;
 214                 if (!isxdigit(c))
 215                         continue;
 216                 if (isalpha(c)) {
 217                         if (isupper(c))
 218                                 c = c - 'A' + 10;
 219                         else
 220                                 c = c - 'a' + 10;
 221                 } else
 222                         c = c - '0' + 0;
 223                 if ((i&1) == 0)
 224                         c <<= 4;
 225                 u[i/2] ^= c;
 226                 i++;
 227                 if (i == uuidlen*2)
 228                         i = 0;
 229         }
 230         return 1;
 231 }
 232 #endif
 233
 234 /* Iterate through /etc/mtab, finding mountpoints
 235  * at or below a given path
 236  */
 237 static char *next_mnt(void **v, char *p)
 238 {
 239         FILE *f;
 240         struct mntent *me;
 241         int l = strlen(p);
 242         if (*v == NULL) {
 243                 f = setmntent("/etc/mtab", "r");
 244                 *v = f;
 245         } else
 246                 f = *v;
 247         while ((me = getmntent(f)) != NULL &&
 248                (strncmp(me->mnt_dir, p, l) != 0 ||
 249                 me->mnt_dir[l] != '/'))
 250                 ;
 251         if (me == NULL) {
 252                 endmntent(f);
 253                 *v = NULL;
 254                 return NULL;
 255         }
 256         return me->mnt_dir;
 257 }
 258
 259 void nfsd_fh(FILE *f)
 260 {
 261         /* request are:
 262          *  domain fsidtype fsid
 263          * interpret fsid, find export point and options, and write:
 264          *  domain fsidtype fsid expiry path
 265          */
 266         char *cp;
 267         char *dom;
 268         int fsidtype;
 269         int fsidlen;
 270         unsigned int dev, major=0, minor=0;
 271         unsigned int inode=0;
 272         unsigned long long inode64;
 273         unsigned int fsidnum=0;
 274         char fsid[32];
 275         struct exportent *found = NULL;
 276         struct hostent *he = NULL;
 277         struct in_addr addr;
 278         char *found_path = NULL;
 279         nfs_export *exp;
 280         int i;
 281         int dev_missing = 0;
 282         int uuidlen = 0;
 283         char *fhuuid = NULL;
 284
 285         if (readline(fileno(f), &lbuf, &lbuflen) != 1)
 286                 return;
 287
 288         xlog(D_CALL, "nfsd_fh: inbuf '%s'", lbuf);
 289
 290         cp = lbuf;
 291
 292         dom = malloc(strlen(cp));
 293         if (dom == NULL)
 294                 return;
 295         if (qword_get(&cp, dom, strlen(cp)) <= 0)
 296                 goto out;
 297         if (qword_get_int(&cp, &fsidtype) != 0)
 298                 goto out;
 299         if (fsidtype < 0 || fsidtype > 7)
 300                 goto out; /* unknown type */
 301         if ((fsidlen = qword_get(&cp, fsid, 32)) <= 0)
 302                 goto out;
 303         switch(fsidtype) {
 304         case FSID_DEV: /* 4 bytes: 2 major, 2 minor, 4 inode */
 305                 if (fsidlen != 8)
 306                         goto out;
 307                 memcpy(&dev, fsid, 4);
 308                 memcpy(&inode, fsid+4, 4);
 309                 major = ntohl(dev)>>16;
 310                 minor = ntohl(dev) & 0xFFFF;
 311                 break;
 312
 313         case FSID_NUM: /* 4 bytes - fsid */
 314                 if (fsidlen != 4)
 315                         goto out;
 316                 memcpy(&fsidnum, fsid, 4);
 317                 break;
 318
 319         case FSID_MAJOR_MINOR: /* 12 bytes: 4 major, 4 minor, 4 inode
 320                  * This format is never actually used but was
 321                  * an historical accident
 322                  */
 323                 if (fsidlen != 12)
 324                         goto out;
 325                 memcpy(&dev, fsid, 4); major = ntohl(dev);
 326                 memcpy(&dev, fsid+4, 4); minor = ntohl(dev);
 327                 memcpy(&inode, fsid+8, 4);
 328                 break;
 329
 330         case FSID_ENCODE_DEV: /* 8 bytes: 4 byte packed device number, 4 inode */
 331                 /* This is *host* endian, not net-byte-order, because
 332                  * no-one outside this host has any business interpreting it
 333                  */
 334                 if (fsidlen != 8)
 335                         goto out;
 336                 memcpy(&dev, fsid, 4);
 337                 memcpy(&inode, fsid+4, 4);
 338                 major = (dev & 0xfff00) >> 8;
 339                 minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
 340                 break;
 341
 342         case FSID_UUID4_INUM: /* 4 byte inode number and 4 byte uuid */
 343                 if (fsidlen != 8)
 344                         goto out;
 345                 memcpy(&inode, fsid, 4);
 346                 uuidlen = 4;
 347                 fhuuid = fsid+4;
 348                 break;
 349         case FSID_UUID8: /* 8 byte uuid */
 350                 if (fsidlen != 8)
 351                         goto out;
 352                 uuidlen = 8;
 353                 fhuuid = fsid;
 354                 break;
 355         case FSID_UUID16: /* 16 byte uuid */
 356                 if (fsidlen != 16)
 357                         goto out;
 358                 uuidlen = 16;
 359                 fhuuid = fsid;
 360                 break;
 361         case FSID_UUID16_INUM: /* 8 byte inode number and 16 byte uuid */
 362                 if (fsidlen != 24)
 363                         goto out;
 364                 memcpy(&inode64, fsid, 8);
 365                 inode = inode64;
 366                 uuidlen = 16;
 367                 fhuuid = fsid+8;
 368                 break;
 369         }
 370
 371         auth_reload();
 372
 373         /* Now determine export point for this fsid/domain */
 374         for (i=0 ; i < MCL_MAXTYPES; i++) {
 375                 nfs_export *next_exp;
 376                 for (exp = exportlist[i]; exp; exp = next_exp) {
 377                         struct stat stb;
 378                         char u[16];
 379                         char *path;
 380
 381                         if (exp->m_export.e_flags & NFSEXP_CROSSMOUNT) {
 382                                 static nfs_export *prev = NULL;
 383                                 static void *mnt = NULL;
 384
 385                                 if (prev == exp) {
 386                                         /* try a submount */
 387                                         path = next_mnt(&mnt, exp->m_export.e_path);
 388                                         if (!path) {
 389                                                 next_exp = exp->m_next;
 390                                                 prev = NULL;
 391                                                 continue;
 392                                         }
 393                                         next_exp = exp;
 394                                 } else {
 395                                         prev = exp;
 396                                         mnt = NULL;
 397                                         path = exp->m_export.e_path;
 398                                         next_exp = exp;
 399                                 }
 400                         } else {
 401                                 path = exp->m_export.e_path;
 402                                 next_exp = exp->m_next;
 403                         }
 404
 405                         if (!use_ipaddr && !client_member(dom, exp->m_client->m_hostname))
 406                                 continue;
 407                         if (exp->m_export.e_mountpoint &&
 408                             !is_mountpoint(exp->m_export.e_mountpoint[0]?
 409                                            exp->m_export.e_mountpoint:
 410                                            exp->m_export.e_path))
 411                                 dev_missing ++;
 412                         if (stat(path, &stb) != 0)
 413                                 continue;
 414                         if (!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode)) {
 415                                 continue;
 416                         }
 417                         switch(fsidtype){
 418                         case FSID_DEV:
 419                         case FSID_MAJOR_MINOR:
 420                         case FSID_ENCODE_DEV:
 421                                 if (stb.st_ino != inode)
 422                                         continue;
 423                                 if (major != major(stb.st_dev) ||
 424                                     minor != minor(stb.st_dev))
 425                                         continue;
 426                                 break;
 427                         case FSID_NUM:
 428                                 if (((exp->m_export.e_flags & NFSEXP_FSID) == 0 ||
 429                                      exp->m_export.e_fsid != fsidnum))
 430                                         continue;
 431                                 break;
 432                         case FSID_UUID4_INUM:
 433                         case FSID_UUID16_INUM:
 434                                 if (stb.st_ino != inode)
 435                                         continue;
 436                                 goto check_uuid;
 437                         case FSID_UUID8:
 438                         case FSID_UUID16:
 439                                 if (!is_mountpoint(path))
 440                                         continue;
 441                         check_uuid:
 442 #if USE_BLKID
 443                                 if (exp->m_export.e_uuid)
 444                                         get_uuid(NULL, exp->m_export.e_uuid,
 445                                                  uuidlen, u);
 446                                 else if (get_uuid(path, NULL,
 447                                                   uuidlen, u) == 0)
 448                                         continue;
 449
 450                                 if (memcmp(u, fhuuid, uuidlen) != 0)
 451                                         continue;
 452                                 break;
 453 #else
 454                                 continue;
 455 #endif
 456                         }
 457                         if (use_ipaddr) {
 458                                 if (he == NULL) {
 459                                         if (!inet_aton(dom, &addr))
 460                                                 goto out;
 461                                         he = client_resolve(addr);
 462                                 }
 463                                 if (!client_check(exp->m_client, he))
 464                                         continue;
 465                         }
 466                         /* It's a match !! */
 467                         if (!found) {
 468                                 found = &exp->m_export;
 469                                 found_path = strdup(path);
 470                                 if (found_path == NULL)
 471                                         goto out;
 472                         } else if (strcmp(found->e_path, exp->m_export.e_path)!= 0)
 473                         {
 474                                 xlog(L_WARNING, "%s and %s have same filehandle for %s, using first",
 475                                      found_path, path, dom);
 476                         }
 477                 }
 478         }
 479         if (found &&
 480             found->e_mountpoint &&
 481             !is_mountpoint(found->e_mountpoint[0]?
 482                            found->e_mountpoint:
 483                            found->e_path)) {
 484                 /* Cannot export this yet
 485                  * should log a warning, but need to rate limit
 486                    xlog(L_WARNING, "%s not exported as %d not a mountpoint",
 487                    found->e_path, found->e_mountpoint);
 488                  */
 489                 /* FIXME we need to make sure we re-visit this later */
 490                 goto out;
 491         }
 492         if (!found && dev_missing) {
 493                 /* The missing dev could be what we want, so just be
 494                  * quite rather than returning stale yet
 495                  */
 496                 goto out;
 497         }
 498
 499         if (found)
 500                 if (cache_export_ent(dom, found, found_path) < 0)
 501                         found = 0;
 502
 503         qword_print(f, dom);
 504         qword_printint(f, fsidtype);
 505         qword_printhex(f, fsid, fsidlen);
 506         /* The fsid -> path lookup can be quite expensive as it
 507          * potentially stats and reads lots of devices, and some of those
 508          * might have spun-down.  The Answer is not likely to
 509          * change underneath us, and an 'exportfs -f' can always
 510          * remove this from the kernel, so use a really log
 511          * timeout.  Maybe this should be configurable on the command
 512          * line.
 513          */
 514         qword_printint(f, 0x7fffffff);
 515         if (found)
 516                 qword_print(f, found_path);
 517         qword_eol(f);
 518  out:
 519         free(found_path);
 520         free(he);
 521         free(dom);
 522         xlog(D_CALL, "nfsd_fh: found %p path %s", found, found ? found->e_path : NULL);
 523         return;
 524 }
 525
 526 static void write_fsloc(FILE *f, struct exportent *ep, char *path)
 527 {
 528         struct servers *servers;
 529
 530         if (ep->e_fslocmethod == FSLOC_NONE)
 531                 return;
 532
 533         servers = replicas_lookup(ep->e_fslocmethod, ep->e_fslocdata, path);
 534         if (!servers)
 535                 return;
 536         qword_print(f, "fsloc");
 537         qword_printint(f, servers->h_num);
 538         if (servers->h_num >= 0) {
 539                 int i;
 540                 for (i=0; i<servers->h_num; i++) {
 541                         qword_print(f, servers->h_mp[i]->h_host);
 542                         qword_print(f, servers->h_mp[i]->h_path);
 543                 }
 544         }
 545         qword_printint(f, servers->h_referral);
 546         release_replicas(servers);
 547 }
 548
 549 static void write_secinfo(FILE *f, struct exportent *ep)
 550 {
 551         struct sec_entry *p;
 552
 553         for (p = ep->e_secinfo; p->flav; p++)
 554                 ; /* Do nothing */
 555         if (p == ep->e_secinfo) {
 556                 /* There was no sec= option */
 557                 return;
 558         }
 559         qword_print(f, "secinfo");
 560         qword_printint(f, p - ep->e_secinfo);
 561         for (p = ep->e_secinfo; p->flav; p++) {
 562                 qword_printint(f, p->flav->fnum);
 563                 qword_printint(f, p->flags);
 564         }
 565
 566 }
 567
 568 static int dump_to_cache(FILE *f, char *domain, char *path, struct exportent *exp)
 569 {
 570         qword_print(f, domain);
 571         qword_print(f, path);
 572         qword_printint(f, time(0)+30*60);
 573         if (exp) {
 574                 int different_fs = strcmp(path, exp->e_path) != 0;
 575
 576                 if (different_fs)
 577                         qword_printint(f, exp->e_flags & ~NFSEXP_FSID);
 578                 else
 579                         qword_printint(f, exp->e_flags);
 580                 qword_printint(f, exp->e_anonuid);
 581                 qword_printint(f, exp->e_anongid);
 582                 qword_printint(f, exp->e_fsid);
 583                 write_fsloc(f, exp, path);
 584                 write_secinfo(f, exp);
 585 #if USE_BLKID
 586                 if (exp->e_uuid == NULL || different_fs) {
 587                         char u[16];
 588                         if (get_uuid(path, NULL, 16, u)) {
 589                                 qword_print(f, "uuid");
 590                                 qword_printhex(f, u, 16);
 591                         }
 592                 } else {
 593                         qword_print(f, "uuid");
 594                         qword_printhex(f, exp->e_uuid, 16);
 595                 }
 596 #endif
 597         }
 598         return qword_eol(f);
 599 }
 600
 601 void nfsd_export(FILE *f)
 602 {
 603         /* requests are:
 604          *  domain path
 605          * determine export options and return:
 606          *  domain path expiry flags anonuid anongid fsid
 607          */
 608
 609         char *cp;
 610         int i;
 611         char *dom, *path;
 612         nfs_export *exp, *found = NULL;
 613         int found_type = 0;
 614         struct in_addr addr;
 615         struct hostent *he = NULL;
 616
 617
 618         if (readline(fileno(f), &lbuf, &lbuflen) != 1)
 619                 return;
 620
 621         xlog(D_CALL, "nfsd_export: inbuf '%s'", lbuf);
 622
 623         cp = lbuf;
 624         dom = malloc(strlen(cp));
 625         path = malloc(strlen(cp));
 626
 627         if (!dom || !path)
 628                 goto out;
 629
 630         if (qword_get(&cp, dom, strlen(lbuf)) <= 0)
 631                 goto out;
 632         if (qword_get(&cp, path, strlen(lbuf)) <= 0)
 633                 goto out;
 634
 635         auth_reload();
 636
 637         /* now find flags for this export point in this domain */
 638         for (i=0 ; i < MCL_MAXTYPES; i++) {
 639                 for (exp = exportlist[i]; exp; exp = exp->m_next) {
 640                         if (!use_ipaddr && !client_member(dom, exp->m_client->m_hostname))
 641                                 continue;
 642                         if (exp->m_export.e_flags & NFSEXP_CROSSMOUNT) {
 643                                 /* if path is a mountpoint below e_path, then OK */
 644                                 int l = strlen(exp->m_export.e_path);
 645                                 if (strcmp(path, exp->m_export.e_path) == 0 ||
 646                                     (strncmp(path, exp->m_export.e_path, l) == 0 &&
 647                                      path[l] == '/' &&
 648                                      is_mountpoint(path)))
 649                                         /* ok */;
 650                                 else
 651                                         continue;
 652                         } else if (strcmp(path, exp->m_export.e_path) != 0)
 653                                 continue;
 654                         if (use_ipaddr) {
 655                                 if (he == NULL) {
 656                                         if (!inet_aton(dom, &addr))
 657                                                 goto out;
 658                                         he = client_resolve(addr);
 659                                 }
 660                                 if (!client_check(exp->m_client, he))
 661                                         continue;
 662                         }
 663                         if (!found) {
 664                                 found = exp;
 665                                 found_type = i;
 666                                 continue;
 667                         }
 668                         /* If one is a CROSSMOUNT, then prefer the longest path */
 669                         if (((found->m_export.e_flags & NFSEXP_CROSSMOUNT) ||
 670                              (found->m_export.e_flags & NFSEXP_CROSSMOUNT)) &&
 671                             strlen(found->m_export.e_path) !=
 672                             strlen(found->m_export.e_path)) {
 673
 674                                 if (strlen(exp->m_export.e_path) >
 675                                     strlen(found->m_export.e_path)) {
 676                                         found = exp;
 677                                         found_type = i;
 678                                 }
 679                                 continue;
 680
 681                         } else if (found_type == i && found->m_warned == 0) {
 682                                 xlog(L_WARNING, "%s exported to both %s and %s, "
 683                                      "arbitrarily choosing options from first",
 684                                      path, found->m_client->m_hostname, exp->m_client->m_hostname,
 685                                      dom);
 686                                 found->m_warned = 1;
 687                         }
 688                 }
 689         }
 690
 691         if (found) {
 692                 if (dump_to_cache(f, dom, path, &found->m_export) < 0) {
 693                         xlog(L_WARNING,
 694                              "Cannot export %s, possibly unsupported filesystem"
 695                              " or fsid= required", path);
 696                         dump_to_cache(f, dom, path, NULL);
 697                 }
 698         } else {
 699                 dump_to_cache(f, dom, path, NULL);
 700         }
 701  out:
 702         xlog(D_CALL, "nfsd_export: found %p path %s", found, path ? path : NULL);
 703         if (dom) free(dom);
 704         if (path) free(path);
 705         if (he) free(he);
 706 }
 707
 708
 709 struct {
 710         char *cache_name;
 711         void (*cache_handle)(FILE *f);
 712         FILE *f;
 713 } cachelist[] = {
 714         { "auth.unix.ip", auth_unix_ip},
 715         { "auth.unix.gid", auth_unix_gid},
 716         { "nfsd.export", nfsd_export},
 717         { "nfsd.fh", nfsd_fh},
 718         { NULL, NULL }
 719 };
 720
 721 extern int manage_gids;
 722 void cache_open(void)
 723 {
 724         int i;
 725         for (i=0; cachelist[i].cache_name; i++ ) {
 726                 char path[100];
 727                 if (!manage_gids && cachelist[i].cache_handle == auth_unix_gid)
 728                         continue;
 729                 sprintf(path, "/proc/net/rpc/%s/channel", cachelist[i].cache_name);
 730                 cachelist[i].f = fopen(path, "r+");
 731         }
 732 }
 733
 734 void cache_set_fds(fd_set *fdset)
 735 {
 736         int i;
 737         for (i=0; cachelist[i].cache_name; i++) {
 738                 if (cachelist[i].f)
 739                         FD_SET(fileno(cachelist[i].f), fdset);
 740         }
 741 }
 742
 743 int cache_process_req(fd_set *readfds)
 744 {
 745         int i;
 746         int cnt = 0;
 747         for (i=0; cachelist[i].cache_name; i++) {
 748                 if (cachelist[i].f != NULL &&
 749                     FD_ISSET(fileno(cachelist[i].f), readfds)) {
 750                         cnt++;
 751                         cachelist[i].cache_handle(cachelist[i].f);
 752                         FD_CLR(fileno(cachelist[i].f), readfds);
 753                 }
 754         }
 755         return cnt;
 756 }
 757
 758
 759 /*
 760  * Give IP->domain and domain+path->options to kernel
 761  * % echo nfsd $IP  $[now+30*60] $domain > /proc/net/rpc/auth.unix.ip/channel
 762  * % echo $domain $path $[now+30*60] $options $anonuid $anongid $fsid > /proc/net/rpc/nfsd.export/channel
 763  */
 764
 765 int cache_export_ent(char *domain, struct exportent *exp, char *path)
 766 {
 767         int err;
 768         FILE *f = fopen("/proc/net/rpc/nfsd.export/channel", "w");
 769         if (!f)
 770                 return -1;
 771
 772         err = dump_to_cache(f, domain, exp->e_path, exp);
 773         if (err) {
 774                 xlog(L_WARNING,
 775                      "Cannot export %s, possibly unsupported filesystem or"
 776                      " fsid= required", exp->e_path);
 777         }
 778
 779         while (err == 0 && (exp->e_flags & NFSEXP_CROSSMOUNT) && path) {
 780                 /* really an 'if', but we can break out of
 781                  * a 'while' more easily */
 782                 /* Look along 'path' for other filesystems
 783                  * and export them with the same options
 784                  */
 785                 struct stat stb;
 786                 int l = strlen(exp->e_path);
 787                 int dev;
 788
 789                 if (strlen(path) <= l || path[l] != '/' ||
 790                     strncmp(exp->e_path, path, l) != 0)
 791                         break;
 792                 if (stat(exp->e_path, &stb) != 0)
 793                         break;
 794                 dev = stb.st_dev;
 795                 while(path[l] == '/') {
 796                         char c;
 797                         /* errors for submount should fail whole filesystem */
 798                         int err2;
 799
 800                         l++;
 801                         while (path[l] != '/' && path[l])
 802                                 l++;
 803                         c = path[l];
 804                         path[l] = 0;
 805                         err2 = lstat(path, &stb);
 806                         path[l] = c;
 807                         if (err2 < 0)
 808                                 break;
 809                         if (stb.st_dev == dev)
 810                                 continue;
 811                         dev = stb.st_dev;
 812                         path[l] = 0;
 813                         dump_to_cache(f, domain, path, exp);
 814                         path[l] = c;
 815                 }
 816                 break;
 817         }
 818
 819         fclose(f);
 820         return err;
 821 }
 822
 823 int cache_export(nfs_export *exp, char *path)
 824 {
 825         int err;
 826         FILE *f;
 827
 828         f = fopen("/proc/net/rpc/auth.unix.ip/channel", "w");
 829         if (!f)
 830                 return -1;
 831
 832         qword_print(f, "nfsd");
 833         qword_print(f, inet_ntoa(exp->m_client->m_addrlist[0]));
 834         qword_printint(f, time(0)+30*60);
 835         qword_print(f, exp->m_client->m_hostname);
 836         err = qword_eol(f);
 837
 838         fclose(f);
 839
 840         err = cache_export_ent(exp->m_client->m_hostname, &exp->m_export, path)
 841                 || err;
 842         return err;
 843 }
 844
 845 /* Get a filehandle.
 846  * {
 847  *   echo $domain $path $length
 848  *   read filehandle <&0
 849  * } <> /proc/fs/nfsd/filehandle
 850  */
 851 struct nfs_fh_len *
 852 cache_get_filehandle(nfs_export *exp, int len, char *p)
 853 {
 854         FILE *f = fopen("/proc/fs/nfsd/filehandle", "r+");
 855         char buf[200];
 856         char *bp = buf;
 857         int failed;
 858         static struct nfs_fh_len fh;
 859
 860         if (!f)
 861                 f = fopen("/proc/fs/nfs/filehandle", "r+");
 862         if (!f)
 863                 return NULL;
 864
 865         qword_print(f, exp->m_client->m_hostname);
 866         qword_print(f, p);
 867         qword_printint(f, len);
 868         failed = qword_eol(f);
 869
 870         if (!failed)
 871                 failed = (fgets(buf, sizeof(buf), f) == NULL);
 872         fclose(f);
 873         if (failed)
 874                 return NULL;
 875         memset(fh.fh_handle, 0, sizeof(fh.fh_handle));
 876         fh.fh_size = qword_get(&bp, (char *)fh.fh_handle, NFS3_FHSIZE);
 877         return &fh;
 878 }
 879