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 <sys/vfs.h>
  18 #include <time.h>
  19 #include <netinet/in.h>
  20 #include <arpa/inet.h>
  21 #include <unistd.h>
  22 #include <fcntl.h>
  23 #include <errno.h>
  24 #include <ctype.h>
  25 #include <pwd.h>
  26 #include <grp.h>
  27 #include <mntent.h>
  28 #include "misc.h"
  29 #include "nfslib.h"
  30 #include "exportfs.h"
  31 #include "mountd.h"
  32 #include "xmalloc.h"
  33 #include "fsloc.h"
  34 #include "pseudoflavors.h"
  35
  36 #ifdef USE_BLKID
  37 #include "blkid/blkid.h"
  38 #endif
  39
  40
  41 enum nfsd_fsid {
  42         FSID_DEV = 0,
  43         FSID_NUM,
  44         FSID_MAJOR_MINOR,
  45         FSID_ENCODE_DEV,
  46         FSID_UUID4_INUM,
  47         FSID_UUID8,
  48         FSID_UUID16,
  49         FSID_UUID16_INUM,
  50 };
  51
  52 /*
  53  * Support routines for text-based upcalls.
  54  * Fields are separated by spaces.
  55  * Fields are either mangled to quote space tab newline slosh with slosh
  56  * or a hexified with a leading \x
  57  * Record is terminated with newline.
  58  *
  59  */
  60 int cache_export_ent(char *domain, struct exportent *exp, char *p);
  61
  62
  63 char *lbuf  = NULL;
  64 int lbuflen = 0;
  65 extern int use_ipaddr;
  66
  67 void auth_unix_ip(FILE *f)
  68 {
  69         /* requests are
  70          *  class IP-ADDR
  71          * Ignore if class != "nfsd"
  72          * Otherwise find domainname and write back:
  73          *
  74          *  "nfsd" IP-ADDR expiry domainname
  75          */
  76         char *cp;
  77         char class[20];
  78         char ipaddr[20];
  79         char *client = NULL;
  80         struct in_addr addr;
  81         struct hostent *he = NULL;
  82         if (readline(fileno(f), &lbuf, &lbuflen) != 1)
  83                 return;
  84
  85         xlog(D_CALL, "auth_unix_ip: inbuf '%s'", lbuf);
  86
  87         cp = lbuf;
  88
  89         if (qword_get(&cp, class, 20) <= 0 ||
  90             strcmp(class, "nfsd") != 0)
  91                 return;
  92
  93         if (qword_get(&cp, ipaddr, 20) <= 0)
  94                 return;
  95
  96         if (inet_aton(ipaddr, &addr)==0)
  97                 return;
  98
  99         auth_reload();
 100
 101         /* addr is a valid, interesting address, find the domain name... */
 102         if (!use_ipaddr) {
 103                 he = client_resolve(addr);
 104                 client = client_compose(he);
 105         }
 106
 107         qword_print(f, "nfsd");
 108         qword_print(f, ipaddr);
 109         qword_printint(f, time(0)+30*60);
 110         if (use_ipaddr)
 111                 qword_print(f, ipaddr);
 112         else if (client)
 113                 qword_print(f, *client?client:"DEFAULT");
 114         qword_eol(f);
 115         xlog(D_CALL, "auth_unix_ip: client %p '%s'", client, client?client: "DEFAULT");
 116
 117         if (client) free(client);
 118         free(he);
 119 }
 120
 121 void auth_unix_gid(FILE *f)
 122 {
 123         /* Request are
 124          *  uid
 125          * reply is
 126          *  uid expiry count list of group ids
 127          */
 128         int uid;
 129         struct passwd *pw;
 130         gid_t glist[100], *groups = glist;
 131         int ngroups = 100;
 132         int rv, i;
 133         char *cp;
 134
 135         if (readline(fileno(f), &lbuf, &lbuflen) != 1)
 136                 return;
 137
 138         cp = lbuf;
 139         if (qword_get_int(&cp, &uid) != 0)
 140                 return;
 141
 142         pw = getpwuid(uid);
 143         if (!pw)
 144                 rv = -1;
 145         else {
 146                 rv = getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
 147                 if (rv == -1 && ngroups >= 100) {
 148                         groups = malloc(sizeof(gid_t)*ngroups);
 149                         if (!groups)
 150                                 rv = -1;
 151                         else
 152                                 rv = getgrouplist(pw->pw_name, pw->pw_gid,
 153                                                   groups, &ngroups);
 154                 }
 155         }
 156         qword_printint(f, uid);
 157         qword_printint(f, time(0)+30*60);
 158         if (rv >= 0) {
 159                 qword_printint(f, ngroups);
 160                 for (i=0; i<ngroups; i++)
 161                         qword_printint(f, groups[i]);
 162         } else
 163                 qword_printint(f, 0);
 164         qword_eol(f);
 165
 166         if (groups != glist)
 167                 free(groups);
 168 }
 169
 170 #if USE_BLKID
 171 static const char *get_uuid_blkdev(char *path)
 172 {
 173         static blkid_cache cache = NULL;
 174         struct stat stb;
 175         char *devname;
 176         blkid_tag_iterate iter;
 177         blkid_dev dev;
 178         const char *type;
 179         const char *val = NULL;
 180
 181         if (cache == NULL)
 182                 blkid_get_cache(&cache, NULL);
 183
 184         if (stat(path, &stb) != 0)
 185                 return NULL;
 186         devname = blkid_devno_to_devname(stb.st_dev);
 187         if (!devname)
 188                 return NULL;
 189         dev = blkid_get_dev(cache, devname, BLKID_DEV_NORMAL);
 190         free(devname);
 191         if (!dev)
 192                 return NULL;
 193         iter = blkid_tag_iterate_begin(dev);
 194         if (!iter)
 195                 return NULL;
 196         while (blkid_tag_next(iter, &type, &val) == 0)
 197                 if (strcmp(type, "UUID") == 0)
 198                         break;
 199         blkid_tag_iterate_end(iter);
 200         return val;
 201 }
 202 #else
 203 #define get_uuid_blkdev(path) (NULL)
 204 #endif
 205
 206 int get_uuid(char *path, char *uuid, int uuidlen, char *u)
 207 {
 208         /* extract hex digits from uuidstr and compose a uuid
 209          * of the given length (max 16), xoring bytes to make
 210          * a smaller uuid.  Then compare with uuid
 211          */
 212         int i = 0;
 213         const char *val = NULL;
 214         char fsid_val[17];
 215
 216         if (path) {
 217                 val = get_uuid_blkdev(path);
 218                 if (!val)
 219                         return 0;
 220         } else {
 221                 val = uuid;
 222         }
 223
 224         memset(u, 0, uuidlen);
 225         for ( ; *val ; val++) {
 226                 char c = *val;
 227                 if (!isxdigit(c))
 228                         continue;
 229                 if (isalpha(c)) {
 230                         if (isupper(c))
 231                                 c = c - 'A' + 10;
 232                         else
 233                                 c = c - 'a' + 10;
 234                 } else
 235                         c = c - '0' + 0;
 236                 if ((i&1) == 0)
 237                         c <<= 4;
 238                 u[i/2] ^= c;
 239                 i++;
 240                 if (i == uuidlen*2)
 241                         i = 0;
 242         }
 243         return 1;
 244 }
 245
 246 /* Iterate through /etc/mtab, finding mountpoints
 247  * at or below a given path
 248  */
 249 static char *next_mnt(void **v, char *p)
 250 {
 251         FILE *f;
 252         struct mntent *me;
 253         int l = strlen(p);
 254         if (*v == NULL) {
 255                 f = setmntent("/etc/mtab", "r");
 256                 *v = f;
 257         } else
 258                 f = *v;
 259         while ((me = getmntent(f)) != NULL &&
 260                (strncmp(me->mnt_dir, p, l) != 0 ||
 261                 me->mnt_dir[l] != '/'))
 262                 ;
 263         if (me == NULL) {
 264                 endmntent(f);
 265                 *v = NULL;
 266                 return NULL;
 267         }
 268         return me->mnt_dir;
 269 }
 270
 271 void nfsd_fh(FILE *f)
 272 {
 273         /* request are:
 274          *  domain fsidtype fsid
 275          * interpret fsid, find export point and options, and write:
 276          *  domain fsidtype fsid expiry path
 277          */
 278         char *cp;
 279         char *dom;
 280         int fsidtype;
 281         int fsidlen;
 282         unsigned int dev, major=0, minor=0;
 283         unsigned int inode=0;
 284         unsigned long long inode64;
 285         unsigned int fsidnum=0;
 286         char fsid[32];
 287         struct exportent *found = NULL;
 288         struct hostent *he = NULL;
 289         struct in_addr addr;
 290         char *found_path = NULL;
 291         nfs_export *exp;
 292         int i;
 293         int dev_missing = 0;
 294         int uuidlen = 0;
 295         char *fhuuid = NULL;
 296
 297         if (readline(fileno(f), &lbuf, &lbuflen) != 1)
 298                 return;
 299
 300         xlog(D_CALL, "nfsd_fh: inbuf '%s'", lbuf);
 301
 302         cp = lbuf;
 303
 304         dom = malloc(strlen(cp));
 305         if (dom == NULL)
 306                 return;
 307         if (qword_get(&cp, dom, strlen(cp)) <= 0)
 308                 goto out;
 309         if (qword_get_int(&cp, &fsidtype) != 0)
 310                 goto out;
 311         if (fsidtype < 0 || fsidtype > 7)
 312                 goto out; /* unknown type */
 313         if ((fsidlen = qword_get(&cp, fsid, 32)) <= 0)
 314                 goto out;
 315         switch(fsidtype) {
 316         case FSID_DEV: /* 4 bytes: 2 major, 2 minor, 4 inode */
 317                 if (fsidlen != 8)
 318                         goto out;
 319                 memcpy(&dev, fsid, 4);
 320                 memcpy(&inode, fsid+4, 4);
 321                 major = ntohl(dev)>>16;
 322                 minor = ntohl(dev) & 0xFFFF;
 323                 break;
 324
 325         case FSID_NUM: /* 4 bytes - fsid */
 326                 if (fsidlen != 4)
 327                         goto out;
 328                 memcpy(&fsidnum, fsid, 4);
 329                 break;
 330
 331         case FSID_MAJOR_MINOR: /* 12 bytes: 4 major, 4 minor, 4 inode
 332                  * This format is never actually used but was
 333                  * an historical accident
 334                  */
 335                 if (fsidlen != 12)
 336                         goto out;
 337                 memcpy(&dev, fsid, 4); major = ntohl(dev);
 338                 memcpy(&dev, fsid+4, 4); minor = ntohl(dev);
 339                 memcpy(&inode, fsid+8, 4);
 340                 break;
 341
 342         case FSID_ENCODE_DEV: /* 8 bytes: 4 byte packed device number, 4 inode */
 343                 /* This is *host* endian, not net-byte-order, because
 344                  * no-one outside this host has any business interpreting it
 345                  */
 346                 if (fsidlen != 8)
 347                         goto out;
 348                 memcpy(&dev, fsid, 4);
 349                 memcpy(&inode, fsid+4, 4);
 350                 major = (dev & 0xfff00) >> 8;
 351                 minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
 352                 break;
 353
 354         case FSID_UUID4_INUM: /* 4 byte inode number and 4 byte uuid */
 355                 if (fsidlen != 8)
 356                         goto out;
 357                 memcpy(&inode, fsid, 4);
 358                 uuidlen = 4;
 359                 fhuuid = fsid+4;
 360                 break;
 361         case FSID_UUID8: /* 8 byte uuid */
 362                 if (fsidlen != 8)
 363                         goto out;
 364                 uuidlen = 8;
 365                 fhuuid = fsid;
 366                 break;
 367         case FSID_UUID16: /* 16 byte uuid */
 368                 if (fsidlen != 16)
 369                         goto out;
 370                 uuidlen = 16;
 371                 fhuuid = fsid;
 372                 break;
 373         case FSID_UUID16_INUM: /* 8 byte inode number and 16 byte uuid */
 374                 if (fsidlen != 24)
 375                         goto out;
 376                 memcpy(&inode64, fsid, 8);
 377                 inode = inode64;
 378                 uuidlen = 16;
 379                 fhuuid = fsid+8;
 380                 break;
 381         }
 382
 383         auth_reload();
 384
 385         /* Now determine export point for this fsid/domain */
 386         for (i=0 ; i < MCL_MAXTYPES; i++) {
 387                 nfs_export *next_exp;
 388                 for (exp = exportlist[i]; exp; exp = next_exp) {
 389                         struct stat stb;
 390                         char u[16];
 391                         char *path;
 392
 393                         if (exp->m_export.e_flags & NFSEXP_CROSSMOUNT) {
 394                                 static nfs_export *prev = NULL;
 395                                 static void *mnt = NULL;
 396
 397                                 if (prev == exp) {
 398                                         /* try a submount */
 399                                         path = next_mnt(&mnt, exp->m_export.e_path);
 400                                         if (!path) {
 401                                                 next_exp = exp->m_next;
 402                                                 prev = NULL;
 403                                                 continue;
 404                                         }
 405                                         next_exp = exp;
 406                                 } else {
 407                                         prev = exp;
 408                                         mnt = NULL;
 409                                         path = exp->m_export.e_path;
 410                                         next_exp = exp;
 411                                 }
 412                         } else {
 413                                 path = exp->m_export.e_path;
 414                                 next_exp = exp->m_next;
 415                         }
 416
 417                         if (!use_ipaddr && !client_member(dom, exp->m_client->m_hostname))
 418                                 continue;
 419                         if (exp->m_export.e_mountpoint &&
 420                             !is_mountpoint(exp->m_export.e_mountpoint[0]?
 421                                            exp->m_export.e_mountpoint:
 422                                            exp->m_export.e_path))
 423                                 dev_missing ++;
 424                         if (stat(path, &stb) != 0)
 425                                 continue;
 426                         if (!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode)) {
 427                                 continue;
 428                         }
 429                         switch(fsidtype){
 430                         case FSID_DEV:
 431                         case FSID_MAJOR_MINOR:
 432                         case FSID_ENCODE_DEV:
 433                                 if (stb.st_ino != inode)
 434                                         continue;
 435                                 if (major != major(stb.st_dev) ||
 436                                     minor != minor(stb.st_dev))
 437                                         continue;
 438                                 break;
 439                         case FSID_NUM:
 440                                 if (((exp->m_export.e_flags & NFSEXP_FSID) == 0 ||
 441                                      exp->m_export.e_fsid != fsidnum))
 442                                         continue;
 443                                 break;
 444                         case FSID_UUID4_INUM:
 445                         case FSID_UUID16_INUM:
 446                                 if (stb.st_ino != inode)
 447                                         continue;
 448                                 goto check_uuid;
 449                         case FSID_UUID8:
 450                         case FSID_UUID16:
 451                                 if (!is_mountpoint(path))
 452                                         continue;
 453                         check_uuid:
 454                                 if (exp->m_export.e_uuid)
 455                                         get_uuid(NULL, exp->m_export.e_uuid,
 456                                                  uuidlen, u);
 457                                 else if (get_uuid(path, NULL, uuidlen, u) == 0)
 458                                         continue;
 459
 460                                 if (memcmp(u, fhuuid, uuidlen) != 0)
 461                                         continue;
 462                                 break;
 463                         }
 464                         if (use_ipaddr) {
 465                                 if (he == NULL) {
 466                                         if (!inet_aton(dom, &addr))
 467                                                 goto out;
 468                                         he = client_resolve(addr);
 469                                 }
 470                                 if (!client_check(exp->m_client, he))
 471                                         continue;
 472                         }
 473                         /* It's a match !! */
 474                         if (!found) {
 475                                 found = &exp->m_export;
 476                                 found_path = strdup(path);
 477                                 if (found_path == NULL)
 478                                         goto out;
 479                         } else if (strcmp(found->e_path, exp->m_export.e_path)!= 0)
 480                         {
 481                                 xlog(L_WARNING, "%s and %s have same filehandle for %s, using first",
 482                                      found_path, path, dom);
 483                         }
 484                 }
 485         }
 486         if (found &&
 487             found->e_mountpoint &&
 488             !is_mountpoint(found->e_mountpoint[0]?
 489                            found->e_mountpoint:
 490                            found->e_path)) {
 491                 /* Cannot export this yet
 492                  * should log a warning, but need to rate limit
 493                    xlog(L_WARNING, "%s not exported as %d not a mountpoint",
 494                    found->e_path, found->e_mountpoint);
 495                  */
 496                 /* FIXME we need to make sure we re-visit this later */
 497                 goto out;
 498         }
 499         if (!found && dev_missing) {
 500                 /* The missing dev could be what we want, so just be
 501                  * quite rather than returning stale yet
 502                  */
 503                 goto out;
 504         }
 505
 506         if (found)
 507                 if (cache_export_ent(dom, found, found_path) < 0)
 508                         found = 0;
 509
 510         qword_print(f, dom);
 511         qword_printint(f, fsidtype);
 512         qword_printhex(f, fsid, fsidlen);
 513         /* The fsid -> path lookup can be quite expensive as it
 514          * potentially stats and reads lots of devices, and some of those
 515          * might have spun-down.  The Answer is not likely to
 516          * change underneath us, and an 'exportfs -f' can always
 517          * remove this from the kernel, so use a really log
 518          * timeout.  Maybe this should be configurable on the command
 519          * line.
 520          */
 521         qword_printint(f, 0x7fffffff);
 522         if (found)
 523                 qword_print(f, found_path);
 524         qword_eol(f);
 525  out:
 526         if (found_path)
 527                 free(found_path);
 528         if (he)
 529                 free(he);
 530         free(dom);
 531         xlog(D_CALL, "nfsd_fh: found %p path %s", found, found ? found->e_path : NULL);
 532         return;
 533 }
 534
 535 static void write_fsloc(FILE *f, struct exportent *ep, char *path)
 536 {
 537         struct servers *servers;
 538
 539         if (ep->e_fslocmethod == FSLOC_NONE)
 540                 return;
 541
 542         servers = replicas_lookup(ep->e_fslocmethod, ep->e_fslocdata, path);
 543         if (!servers)
 544                 return;
 545         qword_print(f, "fsloc");
 546         qword_printint(f, servers->h_num);
 547         if (servers->h_num >= 0) {
 548                 int i;
 549                 for (i=0; i<servers->h_num; i++) {
 550                         qword_print(f, servers->h_mp[i]->h_host);
 551                         qword_print(f, servers->h_mp[i]->h_path);
 552                 }
 553         }
 554         qword_printint(f, servers->h_referral);
 555         release_replicas(servers);
 556 }
 557
 558 static void write_secinfo(FILE *f, struct exportent *ep)
 559 {
 560         struct sec_entry *p;
 561
 562         for (p = ep->e_secinfo; p->flav; p++)
 563                 ; /* Do nothing */
 564         if (p == ep->e_secinfo) {
 565                 /* There was no sec= option */
 566                 return;
 567         }
 568         qword_print(f, "secinfo");
 569         qword_printint(f, p - ep->e_secinfo);
 570         for (p = ep->e_secinfo; p->flav; p++) {
 571                 qword_printint(f, p->flav->fnum);
 572                 qword_printint(f, p->flags);
 573         }
 574
 575 }
 576
 577 static int dump_to_cache(FILE *f, char *domain, char *path, struct exportent *exp)
 578 {
 579         qword_print(f, domain);
 580         qword_print(f, path);
 581         qword_printint(f, time(0)+30*60);
 582         if (exp) {
 583                 int different_fs = strcmp(path, exp->e_path) != 0;
 584
 585                 if (different_fs)
 586                         qword_printint(f, exp->e_flags & ~NFSEXP_FSID);
 587                 else
 588                         qword_printint(f, exp->e_flags);
 589                 qword_printint(f, exp->e_anonuid);
 590                 qword_printint(f, exp->e_anongid);
 591                 qword_printint(f, exp->e_fsid);
 592                 write_fsloc(f, exp, path);
 593                 write_secinfo(f, exp);
 594                 if (exp->e_uuid == NULL || different_fs) {
 595                         char u[16];
 596                         if (get_uuid(path, NULL, 16, u)) {
 597                                 qword_print(f, "uuid");
 598                                 qword_printhex(f, u, 16);
 599                         }
 600                 } else {
 601                         char u[16];
 602                         get_uuid(NULL, exp->e_uuid, 16, u);
 603                         qword_print(f, "uuid");
 604                         qword_printhex(f, u, 16);
 605                 }
 606         }
 607         return qword_eol(f);
 608 }
 609
 610 void nfsd_export(FILE *f)
 611 {
 612         /* requests are:
 613          *  domain path
 614          * determine export options and return:
 615          *  domain path expiry flags anonuid anongid fsid
 616          */
 617
 618         char *cp;
 619         int i;
 620         char *dom, *path;
 621         nfs_export *exp, *found = NULL;
 622         int found_type = 0;
 623         struct in_addr addr;
 624         struct hostent *he = NULL;
 625
 626
 627         if (readline(fileno(f), &lbuf, &lbuflen) != 1)
 628                 return;
 629
 630         xlog(D_CALL, "nfsd_export: inbuf '%s'", lbuf);
 631
 632         cp = lbuf;
 633         dom = malloc(strlen(cp));
 634         path = malloc(strlen(cp));
 635
 636         if (!dom || !path)
 637                 goto out;
 638
 639         if (qword_get(&cp, dom, strlen(lbuf)) <= 0)
 640                 goto out;
 641         if (qword_get(&cp, path, strlen(lbuf)) <= 0)
 642                 goto out;
 643
 644         auth_reload();
 645
 646         /* now find flags for this export point in this domain */
 647         for (i=0 ; i < MCL_MAXTYPES; i++) {
 648                 for (exp = exportlist[i]; exp; exp = exp->m_next) {
 649                         if (!use_ipaddr && !client_member(dom, exp->m_client->m_hostname))
 650                                 continue;
 651                         if (exp->m_export.e_flags & NFSEXP_CROSSMOUNT) {
 652                                 /* if path is a mountpoint below e_path, then OK */
 653                                 int l = strlen(exp->m_export.e_path);
 654                                 if (strcmp(path, exp->m_export.e_path) == 0 ||
 655                                     (strncmp(path, exp->m_export.e_path, l) == 0 &&
 656                                      path[l] == '/' &&
 657                                      is_mountpoint(path)))
 658                                         /* ok */;
 659                                 else
 660                                         continue;
 661                         } else if (strcmp(path, exp->m_export.e_path) != 0)
 662                                 continue;
 663                         if (use_ipaddr) {
 664                                 if (he == NULL) {
 665                                         if (!inet_aton(dom, &addr))
 666                                                 goto out;
 667                                         he = client_resolve(addr);
 668                                 }
 669                                 if (!client_check(exp->m_client, he))
 670                                         continue;
 671                         }
 672                         if (!found) {
 673                                 found = exp;
 674                                 found_type = i;
 675                                 continue;
 676                         }
 677                         /* If one is a CROSSMOUNT, then prefer the longest path */
 678                         if (((found->m_export.e_flags & NFSEXP_CROSSMOUNT) ||
 679                              (exp->m_export.e_flags & NFSEXP_CROSSMOUNT)) &&
 680                             strlen(found->m_export.e_path) !=
 681                             strlen(exp->m_export.e_path)) {
 682
 683                                 if (strlen(exp->m_export.e_path) >
 684                                     strlen(found->m_export.e_path)) {
 685                                         found = exp;
 686                                         found_type = i;
 687                                 }
 688                                 continue;
 689
 690                         } else if (found_type == i && found->m_warned == 0) {
 691                                 xlog(L_WARNING, "%s exported to both %s and %s, "
 692                                      "arbitrarily choosing options from first",
 693                                      path, found->m_client->m_hostname, exp->m_client->m_hostname,
 694                                      dom);
 695                                 found->m_warned = 1;
 696                         }
 697                 }
 698         }
 699
 700         if (found) {
 701                 if (dump_to_cache(f, dom, path, &found->m_export) < 0) {
 702                         xlog(L_WARNING,
 703                              "Cannot export %s, possibly unsupported filesystem"
 704                              " or fsid= required", path);
 705                         dump_to_cache(f, dom, path, NULL);
 706                 }
 707         } else {
 708                 dump_to_cache(f, dom, path, NULL);
 709         }
 710  out:
 711         xlog(D_CALL, "nfsd_export: found %p path %s", found, path ? path : NULL);
 712         if (dom) free(dom);
 713         if (path) free(path);
 714         if (he) free(he);
 715 }
 716
 717
 718 struct {
 719         char *cache_name;
 720         void (*cache_handle)(FILE *f);
 721         FILE *f;
 722 } cachelist[] = {
 723         { "auth.unix.ip", auth_unix_ip},
 724         { "auth.unix.gid", auth_unix_gid},
 725         { "nfsd.export", nfsd_export},
 726         { "nfsd.fh", nfsd_fh},
 727         { NULL, NULL }
 728 };
 729
 730 extern int manage_gids;
 731 void cache_open(void)
 732 {
 733         int i;
 734         for (i=0; cachelist[i].cache_name; i++ ) {
 735                 char path[100];
 736                 if (!manage_gids && cachelist[i].cache_handle == auth_unix_gid)
 737                         continue;
 738                 sprintf(path, "/proc/net/rpc/%s/channel", cachelist[i].cache_name);
 739                 cachelist[i].f = fopen(path, "r+");
 740         }
 741 }
 742
 743 void cache_set_fds(fd_set *fdset)
 744 {
 745         int i;
 746         for (i=0; cachelist[i].cache_name; i++) {
 747                 if (cachelist[i].f)
 748                         FD_SET(fileno(cachelist[i].f), fdset);
 749         }
 750 }
 751
 752 int cache_process_req(fd_set *readfds)
 753 {
 754         int i;
 755         int cnt = 0;
 756         for (i=0; cachelist[i].cache_name; i++) {
 757                 if (cachelist[i].f != NULL &&
 758                     FD_ISSET(fileno(cachelist[i].f), readfds)) {
 759                         cnt++;
 760                         cachelist[i].cache_handle(cachelist[i].f);
 761                         FD_CLR(fileno(cachelist[i].f), readfds);
 762                 }
 763         }
 764         return cnt;
 765 }
 766
 767
 768 /*
 769  * Give IP->domain and domain+path->options to kernel
 770  * % echo nfsd $IP  $[now+30*60] $domain > /proc/net/rpc/auth.unix.ip/channel
 771  * % echo $domain $path $[now+30*60] $options $anonuid $anongid $fsid > /proc/net/rpc/nfsd.export/channel
 772  */
 773
 774 int cache_export_ent(char *domain, struct exportent *exp, char *path)
 775 {
 776         int err;
 777         FILE *f = fopen("/proc/net/rpc/nfsd.export/channel", "w");
 778         if (!f)
 779                 return -1;
 780
 781         err = dump_to_cache(f, domain, exp->e_path, exp);
 782         if (err) {
 783                 xlog(L_WARNING,
 784                      "Cannot export %s, possibly unsupported filesystem or"
 785                      " fsid= required", exp->e_path);
 786         }
 787
 788         while (err == 0 && (exp->e_flags & NFSEXP_CROSSMOUNT) && path) {
 789                 /* really an 'if', but we can break out of
 790                  * a 'while' more easily */
 791                 /* Look along 'path' for other filesystems
 792                  * and export them with the same options
 793                  */
 794                 struct stat stb;
 795                 int l = strlen(exp->e_path);
 796                 int dev;
 797
 798                 if (strlen(path) <= l || path[l] != '/' ||
 799                     strncmp(exp->e_path, path, l) != 0)
 800                         break;
 801                 if (stat(exp->e_path, &stb) != 0)
 802                         break;
 803                 dev = stb.st_dev;
 804                 while(path[l] == '/') {
 805                         char c;
 806                         /* errors for submount should fail whole filesystem */
 807                         int err2;
 808
 809                         l++;
 810                         while (path[l] != '/' && path[l])
 811                                 l++;
 812                         c = path[l];
 813                         path[l] = 0;
 814                         err2 = lstat(path, &stb);
 815                         path[l] = c;
 816                         if (err2 < 0)
 817                                 break;
 818                         if (stb.st_dev == dev)
 819                                 continue;
 820                         dev = stb.st_dev;
 821                         path[l] = 0;
 822                         dump_to_cache(f, domain, path, exp);
 823                         path[l] = c;
 824                 }
 825                 break;
 826         }
 827
 828         fclose(f);
 829         return err;
 830 }
 831
 832 int cache_export(nfs_export *exp, char *path)
 833 {
 834         int err;
 835         FILE *f;
 836
 837         f = fopen("/proc/net/rpc/auth.unix.ip/channel", "w");
 838         if (!f)
 839                 return -1;
 840
 841         qword_print(f, "nfsd");
 842         qword_print(f, inet_ntoa(exp->m_client->m_addrlist[0]));
 843         qword_printint(f, time(0)+30*60);
 844         qword_print(f, exp->m_client->m_hostname);
 845         err = qword_eol(f);
 846
 847         fclose(f);
 848
 849         err = cache_export_ent(exp->m_client->m_hostname, &exp->m_export, path)
 850                 || err;
 851         return err;
 852 }
 853
 854 /* Get a filehandle.
 855  * {
 856  *   echo $domain $path $length
 857  *   read filehandle <&0
 858  * } <> /proc/fs/nfsd/filehandle
 859  */
 860 struct nfs_fh_len *
 861 cache_get_filehandle(nfs_export *exp, int len, char *p)
 862 {
 863         FILE *f = fopen("/proc/fs/nfsd/filehandle", "r+");
 864         char buf[200];
 865         char *bp = buf;
 866         int failed;
 867         static struct nfs_fh_len fh;
 868
 869         if (!f)
 870                 f = fopen("/proc/fs/nfs/filehandle", "r+");
 871         if (!f)
 872                 return NULL;
 873
 874         qword_print(f, exp->m_client->m_hostname);
 875         qword_print(f, p);
 876         qword_printint(f, len);
 877         failed = qword_eol(f);
 878
 879         if (!failed)
 880                 failed = (fgets(buf, sizeof(buf), f) == NULL);
 881         fclose(f);
 882         if (failed)
 883                 return NULL;
 884         memset(fh.fh_handle, 0, sizeof(fh.fh_handle));
 885         fh.fh_size = qword_get(&bp, (char *)fh.fh_handle, NFS3_FHSIZE);
 886         return &fh;
 887 }
 888