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         uid_t 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_uint(&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_printuint(f, uid);
 157         qword_printuint(f, time(0)+30*60);
 158         if (rv >= 0) {
 159                 qword_printuint(f, ngroups);
 160                 for (i=0; i<ngroups; i++)
 161                         qword_printuint(f, groups[i]);
 162         } else
 163                 qword_printuint(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                         struct statfs64 st;
 220
 221                         if (statfs64(path, &st))
 222                                 return 0;
 223                         if (!st.f_fsid.__val[0] && !st.f_fsid.__val[1])
 224                                 return 0;
 225                         snprintf(fsid_val, 17, "%08x%08x",
 226                                  st.f_fsid.__val[0], st.f_fsid.__val[1]);
 227                         val = fsid_val;
 228                 }
 229         } else {
 230                 val = uuid;
 231         }
 232
 233         memset(u, 0, uuidlen);
 234         for ( ; *val ; val++) {
 235                 char c = *val;
 236                 if (!isxdigit(c))
 237                         continue;
 238                 if (isalpha(c)) {
 239                         if (isupper(c))
 240                                 c = c - 'A' + 10;
 241                         else
 242                                 c = c - 'a' + 10;
 243                 } else
 244                         c = c - '0' + 0;
 245                 if ((i&1) == 0)
 246                         c <<= 4;
 247                 u[i/2] ^= c;
 248                 i++;
 249                 if (i == uuidlen*2)
 250                         i = 0;
 251         }
 252         return 1;
 253 }
 254
 255 /* Iterate through /etc/mtab, finding mountpoints
 256  * at or below a given path
 257  */
 258 static char *next_mnt(void **v, char *p)
 259 {
 260         FILE *f;
 261         struct mntent *me;
 262         int l = strlen(p);
 263         if (*v == NULL) {
 264                 f = setmntent("/etc/mtab", "r");
 265                 *v = f;
 266         } else
 267                 f = *v;
 268         while ((me = getmntent(f)) != NULL &&
 269                (strncmp(me->mnt_dir, p, l) != 0 ||
 270                 me->mnt_dir[l] != '/'))
 271                 ;
 272         if (me == NULL) {
 273                 endmntent(f);
 274                 *v = NULL;
 275                 return NULL;
 276         }
 277         return me->mnt_dir;
 278 }
 279
 280 void nfsd_fh(FILE *f)
 281 {
 282         /* request are:
 283          *  domain fsidtype fsid
 284          * interpret fsid, find export point and options, and write:
 285          *  domain fsidtype fsid expiry path
 286          */
 287         char *cp;
 288         char *dom;
 289         int fsidtype;
 290         int fsidlen;
 291         unsigned int dev, major=0, minor=0;
 292         unsigned int inode=0;
 293         unsigned long long inode64;
 294         unsigned int fsidnum=0;
 295         char fsid[32];
 296         struct exportent *found = NULL;
 297         struct hostent *he = NULL;
 298         struct in_addr addr;
 299         char *found_path = NULL;
 300         nfs_export *exp;
 301         int i;
 302         int dev_missing = 0;
 303         int uuidlen = 0;
 304         char *fhuuid = NULL;
 305
 306         if (readline(fileno(f), &lbuf, &lbuflen) != 1)
 307                 return;
 308
 309         xlog(D_CALL, "nfsd_fh: inbuf '%s'", lbuf);
 310
 311         cp = lbuf;
 312
 313         dom = malloc(strlen(cp));
 314         if (dom == NULL)
 315                 return;
 316         if (qword_get(&cp, dom, strlen(cp)) <= 0)
 317                 goto out;
 318         if (qword_get_int(&cp, &fsidtype) != 0)
 319                 goto out;
 320         if (fsidtype < 0 || fsidtype > 7)
 321                 goto out; /* unknown type */
 322         if ((fsidlen = qword_get(&cp, fsid, 32)) <= 0)
 323                 goto out;
 324         switch(fsidtype) {
 325         case FSID_DEV: /* 4 bytes: 2 major, 2 minor, 4 inode */
 326                 if (fsidlen != 8)
 327                         goto out;
 328                 memcpy(&dev, fsid, 4);
 329                 memcpy(&inode, fsid+4, 4);
 330                 major = ntohl(dev)>>16;
 331                 minor = ntohl(dev) & 0xFFFF;
 332                 break;
 333
 334         case FSID_NUM: /* 4 bytes - fsid */
 335                 if (fsidlen != 4)
 336                         goto out;
 337                 memcpy(&fsidnum, fsid, 4);
 338                 break;
 339
 340         case FSID_MAJOR_MINOR: /* 12 bytes: 4 major, 4 minor, 4 inode
 341                  * This format is never actually used but was
 342                  * an historical accident
 343                  */
 344                 if (fsidlen != 12)
 345                         goto out;
 346                 memcpy(&dev, fsid, 4); major = ntohl(dev);
 347                 memcpy(&dev, fsid+4, 4); minor = ntohl(dev);
 348                 memcpy(&inode, fsid+8, 4);
 349                 break;
 350
 351         case FSID_ENCODE_DEV: /* 8 bytes: 4 byte packed device number, 4 inode */
 352                 /* This is *host* endian, not net-byte-order, because
 353                  * no-one outside this host has any business interpreting it
 354                  */
 355                 if (fsidlen != 8)
 356                         goto out;
 357                 memcpy(&dev, fsid, 4);
 358                 memcpy(&inode, fsid+4, 4);
 359                 major = (dev & 0xfff00) >> 8;
 360                 minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
 361                 break;
 362
 363         case FSID_UUID4_INUM: /* 4 byte inode number and 4 byte uuid */
 364                 if (fsidlen != 8)
 365                         goto out;
 366                 memcpy(&inode, fsid, 4);
 367                 uuidlen = 4;
 368                 fhuuid = fsid+4;
 369                 break;
 370         case FSID_UUID8: /* 8 byte uuid */
 371                 if (fsidlen != 8)
 372                         goto out;
 373                 uuidlen = 8;
 374                 fhuuid = fsid;
 375                 break;
 376         case FSID_UUID16: /* 16 byte uuid */
 377                 if (fsidlen != 16)
 378                         goto out;
 379                 uuidlen = 16;
 380                 fhuuid = fsid;
 381                 break;
 382         case FSID_UUID16_INUM: /* 8 byte inode number and 16 byte uuid */
 383                 if (fsidlen != 24)
 384                         goto out;
 385                 memcpy(&inode64, fsid, 8);
 386                 inode = inode64;
 387                 uuidlen = 16;
 388                 fhuuid = fsid+8;
 389                 break;
 390         }
 391
 392         auth_reload();
 393
 394         /* Now determine export point for this fsid/domain */
 395         for (i=0 ; i < MCL_MAXTYPES; i++) {
 396                 nfs_export *next_exp;
 397                 for (exp = exportlist[i].p_head; exp; exp = next_exp) {
 398                         struct stat stb;
 399                         char u[16];
 400                         char *path;
 401
 402                         if (exp->m_export.e_flags & NFSEXP_CROSSMOUNT) {
 403                                 static nfs_export *prev = NULL;
 404                                 static void *mnt = NULL;
 405
 406                                 if (prev == exp) {
 407                                         /* try a submount */
 408                                         path = next_mnt(&mnt, exp->m_export.e_path);
 409                                         if (!path) {
 410                                                 next_exp = exp->m_next;
 411                                                 prev = NULL;
 412                                                 continue;
 413                                         }
 414                                         next_exp = exp;
 415                                 } else {
 416                                         prev = exp;
 417                                         mnt = NULL;
 418                                         path = exp->m_export.e_path;
 419                                         next_exp = exp;
 420                                 }
 421                         } else {
 422                                 path = exp->m_export.e_path;
 423                                 next_exp = exp->m_next;
 424                         }
 425
 426                         if (!use_ipaddr && !client_member(dom, exp->m_client->m_hostname))
 427                                 continue;
 428                         if (exp->m_export.e_mountpoint &&
 429                             !is_mountpoint(exp->m_export.e_mountpoint[0]?
 430                                            exp->m_export.e_mountpoint:
 431                                            exp->m_export.e_path))
 432                                 dev_missing ++;
 433                         if (stat(path, &stb) != 0)
 434                                 continue;
 435                         if (!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode)) {
 436                                 continue;
 437                         }
 438                         switch(fsidtype){
 439                         case FSID_DEV:
 440                         case FSID_MAJOR_MINOR:
 441                         case FSID_ENCODE_DEV:
 442                                 if (stb.st_ino != inode)
 443                                         continue;
 444                                 if (major != major(stb.st_dev) ||
 445                                     minor != minor(stb.st_dev))
 446                                         continue;
 447                                 break;
 448                         case FSID_NUM:
 449                                 if (((exp->m_export.e_flags & NFSEXP_FSID) == 0 ||
 450                                      exp->m_export.e_fsid != fsidnum))
 451                                         continue;
 452                                 break;
 453                         case FSID_UUID4_INUM:
 454                         case FSID_UUID16_INUM:
 455                                 if (stb.st_ino != inode)
 456                                         continue;
 457                                 goto check_uuid;
 458                         case FSID_UUID8:
 459                         case FSID_UUID16:
 460                                 if (!is_mountpoint(path))
 461                                         continue;
 462                         check_uuid:
 463                                 if (exp->m_export.e_uuid)
 464                                         get_uuid(NULL, exp->m_export.e_uuid,
 465                                                  uuidlen, u);
 466                                 else if (get_uuid(path, NULL, uuidlen, u) == 0)
 467                                         continue;
 468
 469                                 if (memcmp(u, fhuuid, uuidlen) != 0)
 470                                         continue;
 471                                 break;
 472                         }
 473                         if (use_ipaddr) {
 474                                 if (he == NULL) {
 475                                         if (!inet_aton(dom, &addr))
 476                                                 goto out;
 477                                         he = client_resolve(addr);
 478                                 }
 479                                 if (!client_check(exp->m_client, he))
 480                                         continue;
 481                         }
 482                         /* It's a match !! */
 483                         if (!found) {
 484                                 found = &exp->m_export;
 485                                 found_path = strdup(path);
 486                                 if (found_path == NULL)
 487                                         goto out;
 488                         } else if (strcmp(found->e_path, exp->m_export.e_path)!= 0)
 489                         {
 490                                 xlog(L_WARNING, "%s and %s have same filehandle for %s, using first",
 491                                      found_path, path, dom);
 492                         }
 493                 }
 494         }
 495         if (found &&
 496             found->e_mountpoint &&
 497             !is_mountpoint(found->e_mountpoint[0]?
 498                            found->e_mountpoint:
 499                            found->e_path)) {
 500                 /* Cannot export this yet
 501                  * should log a warning, but need to rate limit
 502                    xlog(L_WARNING, "%s not exported as %d not a mountpoint",
 503                    found->e_path, found->e_mountpoint);
 504                  */
 505                 /* FIXME we need to make sure we re-visit this later */
 506                 goto out;
 507         }
 508         if (!found && dev_missing) {
 509                 /* The missing dev could be what we want, so just be
 510                  * quite rather than returning stale yet
 511                  */
 512                 goto out;
 513         }
 514
 515         if (found)
 516                 if (cache_export_ent(dom, found, found_path) < 0)
 517                         found = 0;
 518
 519         qword_print(f, dom);
 520         qword_printint(f, fsidtype);
 521         qword_printhex(f, fsid, fsidlen);
 522         /* The fsid -> path lookup can be quite expensive as it
 523          * potentially stats and reads lots of devices, and some of those
 524          * might have spun-down.  The Answer is not likely to
 525          * change underneath us, and an 'exportfs -f' can always
 526          * remove this from the kernel, so use a really log
 527          * timeout.  Maybe this should be configurable on the command
 528          * line.
 529          */
 530         qword_printint(f, 0x7fffffff);
 531         if (found)
 532                 qword_print(f, found_path);
 533         qword_eol(f);
 534  out:
 535         if (found_path)
 536                 free(found_path);
 537         if (he)
 538                 free(he);
 539         free(dom);
 540         xlog(D_CALL, "nfsd_fh: found %p path %s", found, found ? found->e_path : NULL);
 541         return;
 542 }
 543
 544 static void write_fsloc(FILE *f, struct exportent *ep, char *path)
 545 {
 546         struct servers *servers;
 547
 548         if (ep->e_fslocmethod == FSLOC_NONE)
 549                 return;
 550
 551         servers = replicas_lookup(ep->e_fslocmethod, ep->e_fslocdata, path);
 552         if (!servers)
 553                 return;
 554         qword_print(f, "fsloc");
 555         qword_printint(f, servers->h_num);
 556         if (servers->h_num >= 0) {
 557                 int i;
 558                 for (i=0; i<servers->h_num; i++) {
 559                         qword_print(f, servers->h_mp[i]->h_host);
 560                         qword_print(f, servers->h_mp[i]->h_path);
 561                 }
 562         }
 563         qword_printint(f, servers->h_referral);
 564         release_replicas(servers);
 565 }
 566
 567 static void write_secinfo(FILE *f, struct exportent *ep, int flag_mask)
 568 {
 569         struct sec_entry *p;
 570
 571         for (p = ep->e_secinfo; p->flav; p++)
 572                 ; /* Do nothing */
 573         if (p == ep->e_secinfo) {
 574                 /* There was no sec= option */
 575                 return;
 576         }
 577         qword_print(f, "secinfo");
 578         qword_printint(f, p - ep->e_secinfo);
 579         for (p = ep->e_secinfo; p->flav; p++) {
 580                 qword_printint(f, p->flav->fnum);
 581                 qword_printint(f, p->flags & flag_mask);
 582         }
 583
 584 }
 585
 586 static int dump_to_cache(FILE *f, char *domain, char *path, struct exportent *exp)
 587 {
 588         qword_print(f, domain);
 589         qword_print(f, path);
 590         qword_printint(f, time(0)+30*60);
 591         if (exp) {
 592                 int different_fs = strcmp(path, exp->e_path) != 0;
 593                 int flag_mask = different_fs ? ~NFSEXP_FSID : ~0;
 594
 595                 qword_printint(f, exp->e_flags & flag_mask);
 596                 qword_printint(f, exp->e_anonuid);
 597                 qword_printint(f, exp->e_anongid);
 598                 qword_printint(f, exp->e_fsid);
 599                 write_fsloc(f, exp, path);
 600                 write_secinfo(f, exp, flag_mask);
 601                 if (exp->e_uuid == NULL || different_fs) {
 602                         char u[16];
 603                         if (get_uuid(path, NULL, 16, u)) {
 604                                 qword_print(f, "uuid");
 605                                 qword_printhex(f, u, 16);
 606                         }
 607                 } else {
 608                         char u[16];
 609                         get_uuid(NULL, exp->e_uuid, 16, u);
 610                         qword_print(f, "uuid");
 611                         qword_printhex(f, u, 16);
 612                 }
 613         }
 614         return qword_eol(f);
 615 }
 616
 617 static int is_subdirectory(char *subpath, char *path)
 618 {
 619         int l = strlen(path);
 620
 621         return strcmp(subpath, path) == 0
 622                 || (strncmp(subpath, path, l) == 0 && subpath[l] == '/');
 623 }
 624
 625 static int path_matches(nfs_export *exp, char *path)
 626 {
 627         if (exp->m_export.e_flags & NFSEXP_CROSSMOUNT)
 628                 return is_subdirectory(path, exp->m_export.e_path);
 629         return strcmp(path, exp->m_export.e_path) == 0;
 630 }
 631
 632 static int client_matches(nfs_export *exp, char *dom, struct hostent *he)
 633 {
 634         if (use_ipaddr)
 635                 return client_check(exp->m_client, he);
 636         return client_member(dom, exp->m_client->m_hostname);
 637 }
 638
 639 static int export_matches(nfs_export *exp, char *dom, char *path, struct hostent *he)
 640 {
 641         return path_matches(exp, path) && client_matches(exp, dom, he);
 642 }
 643
 644 static nfs_export *lookup_export(char *dom, char *path, struct hostent *he)
 645 {
 646         nfs_export *exp;
 647         nfs_export *found = NULL;
 648         int found_type = 0;
 649         int i;
 650
 651         for (i=0 ; i < MCL_MAXTYPES; i++) {
 652                 for (exp = exportlist[i].p_head; exp; exp = exp->m_next) {
 653                         if (!export_matches(exp, dom, path, he))
 654                                 continue;
 655                         if (!found) {
 656                                 found = exp;
 657                                 found_type = i;
 658                                 continue;
 659                         }
 660
 661                         /* Always prefer non-V4ROOT mounts */
 662                         if (found->m_export.e_flags & NFSEXP_V4ROOT)
 663                                 continue;
 664
 665                         /* If one is a CROSSMOUNT, then prefer the longest path */
 666                         if (((found->m_export.e_flags & NFSEXP_CROSSMOUNT) ||
 667                              (exp->m_export.e_flags & NFSEXP_CROSSMOUNT)) &&
 668                             strlen(found->m_export.e_path) !=
 669                             strlen(exp->m_export.e_path)) {
 670
 671                                 if (strlen(exp->m_export.e_path) >
 672                                     strlen(found->m_export.e_path)) {
 673                                         found = exp;
 674                                         found_type = i;
 675                                 }
 676                                 continue;
 677
 678                         } else if (found_type == i && found->m_warned == 0) {
 679                                 xlog(L_WARNING, "%s exported to both %s and %s, "
 680                                      "arbitrarily choosing options from first",
 681                                      path, found->m_client->m_hostname, exp->m_client->m_hostname,
 682                                      dom);
 683                                 found->m_warned = 1;
 684                         }
 685                 }
 686         }
 687         return found;
 688 }
 689
 690 void nfsd_export(FILE *f)
 691 {
 692         /* requests are:
 693          *  domain path
 694          * determine export options and return:
 695          *  domain path expiry flags anonuid anongid fsid
 696          */
 697
 698         char *cp;
 699         char *dom, *path;
 700         nfs_export *found = NULL;
 701         struct in_addr addr;
 702         struct hostent *he = NULL;
 703
 704
 705         if (readline(fileno(f), &lbuf, &lbuflen) != 1)
 706                 return;
 707
 708         xlog(D_CALL, "nfsd_export: inbuf '%s'", lbuf);
 709
 710         cp = lbuf;
 711         dom = malloc(strlen(cp));
 712         path = malloc(strlen(cp));
 713
 714         if (!dom || !path)
 715                 goto out;
 716
 717         if (qword_get(&cp, dom, strlen(lbuf)) <= 0)
 718                 goto out;
 719         if (qword_get(&cp, path, strlen(lbuf)) <= 0)
 720                 goto out;
 721
 722         auth_reload();
 723
 724         if (use_ipaddr) {
 725                 if (!inet_aton(dom, &addr))
 726                         goto out;
 727                 he = client_resolve(addr);
 728         }
 729
 730         found = lookup_export(dom, path, he);
 731
 732         if (found) {
 733                 if (dump_to_cache(f, dom, path, &found->m_export) < 0) {
 734                         xlog(L_WARNING,
 735                              "Cannot export %s, possibly unsupported filesystem"
 736                              " or fsid= required", path);
 737                         dump_to_cache(f, dom, path, NULL);
 738                 }
 739         } else {
 740                 dump_to_cache(f, dom, path, NULL);
 741         }
 742  out:
 743         xlog(D_CALL, "nfsd_export: found %p path %s", found, path ? path : NULL);
 744         if (dom) free(dom);
 745         if (path) free(path);
 746         if (he) free(he);
 747 }
 748
 749
 750 struct {
 751         char *cache_name;
 752         void (*cache_handle)(FILE *f);
 753         FILE *f;
 754 } cachelist[] = {
 755         { "auth.unix.ip", auth_unix_ip},
 756         { "auth.unix.gid", auth_unix_gid},
 757         { "nfsd.export", nfsd_export},
 758         { "nfsd.fh", nfsd_fh},
 759         { NULL, NULL }
 760 };
 761
 762 extern int manage_gids;
 763 void cache_open(void)
 764 {
 765         int i;
 766         for (i=0; cachelist[i].cache_name; i++ ) {
 767                 char path[100];
 768                 if (!manage_gids && cachelist[i].cache_handle == auth_unix_gid)
 769                         continue;
 770                 sprintf(path, "/proc/net/rpc/%s/channel", cachelist[i].cache_name);
 771                 cachelist[i].f = fopen(path, "r+");
 772         }
 773 }
 774
 775 void cache_set_fds(fd_set *fdset)
 776 {
 777         int i;
 778         for (i=0; cachelist[i].cache_name; i++) {
 779                 if (cachelist[i].f)
 780                         FD_SET(fileno(cachelist[i].f), fdset);
 781         }
 782 }
 783
 784 int cache_process_req(fd_set *readfds)
 785 {
 786         int i;
 787         int cnt = 0;
 788         for (i=0; cachelist[i].cache_name; i++) {
 789                 if (cachelist[i].f != NULL &&
 790                     FD_ISSET(fileno(cachelist[i].f), readfds)) {
 791                         cnt++;
 792                         cachelist[i].cache_handle(cachelist[i].f);
 793                         FD_CLR(fileno(cachelist[i].f), readfds);
 794                 }
 795         }
 796         return cnt;
 797 }
 798
 799
 800 /*
 801  * Give IP->domain and domain+path->options to kernel
 802  * % echo nfsd $IP  $[now+30*60] $domain > /proc/net/rpc/auth.unix.ip/channel
 803  * % echo $domain $path $[now+30*60] $options $anonuid $anongid $fsid > /proc/net/rpc/nfsd.export/channel
 804  */
 805
 806 int cache_export_ent(char *domain, struct exportent *exp, char *path)
 807 {
 808         int err;
 809         FILE *f = fopen("/proc/net/rpc/nfsd.export/channel", "w");
 810         if (!f)
 811                 return -1;
 812
 813         err = dump_to_cache(f, domain, exp->e_path, exp);
 814         if (err) {
 815                 xlog(L_WARNING,
 816                      "Cannot export %s, possibly unsupported filesystem or"
 817                      " fsid= required", exp->e_path);
 818         }
 819
 820         while (err == 0 && (exp->e_flags & NFSEXP_CROSSMOUNT) && path) {
 821                 /* really an 'if', but we can break out of
 822                  * a 'while' more easily */
 823                 /* Look along 'path' for other filesystems
 824                  * and export them with the same options
 825                  */
 826                 struct stat stb;
 827                 int l = strlen(exp->e_path);
 828                 int dev;
 829
 830                 if (strlen(path) <= l || path[l] != '/' ||
 831                     strncmp(exp->e_path, path, l) != 0)
 832                         break;
 833                 if (stat(exp->e_path, &stb) != 0)
 834                         break;
 835                 dev = stb.st_dev;
 836                 while(path[l] == '/') {
 837                         char c;
 838                         /* errors for submount should fail whole filesystem */
 839                         int err2;
 840
 841                         l++;
 842                         while (path[l] != '/' && path[l])
 843                                 l++;
 844                         c = path[l];
 845                         path[l] = 0;
 846                         err2 = lstat(path, &stb);
 847                         path[l] = c;
 848                         if (err2 < 0)
 849                                 break;
 850                         if (stb.st_dev == dev)
 851                                 continue;
 852                         dev = stb.st_dev;
 853                         path[l] = 0;
 854                         dump_to_cache(f, domain, path, exp);
 855                         path[l] = c;
 856                 }
 857                 break;
 858         }
 859
 860         fclose(f);
 861         return err;
 862 }
 863
 864 int cache_export(nfs_export *exp, char *path)
 865 {
 866         int err;
 867         FILE *f;
 868
 869         f = fopen("/proc/net/rpc/auth.unix.ip/channel", "w");
 870         if (!f)
 871                 return -1;
 872
 873         qword_print(f, "nfsd");
 874         qword_print(f, inet_ntoa(exp->m_client->m_addrlist[0]));
 875         qword_printint(f, time(0)+30*60);
 876         qword_print(f, exp->m_client->m_hostname);
 877         err = qword_eol(f);
 878
 879         fclose(f);
 880
 881         err = cache_export_ent(exp->m_client->m_hostname, &exp->m_export, path)
 882                 || err;
 883         return err;
 884 }
 885
 886 /* Get a filehandle.
 887  * {
 888  *   echo $domain $path $length
 889  *   read filehandle <&0
 890  * } <> /proc/fs/nfsd/filehandle
 891  */
 892 struct nfs_fh_len *
 893 cache_get_filehandle(nfs_export *exp, int len, char *p)
 894 {
 895         FILE *f = fopen("/proc/fs/nfsd/filehandle", "r+");
 896         char buf[200];
 897         char *bp = buf;
 898         int failed;
 899         static struct nfs_fh_len fh;
 900
 901         if (!f)
 902                 f = fopen("/proc/fs/nfs/filehandle", "r+");
 903         if (!f)
 904                 return NULL;
 905
 906         qword_print(f, exp->m_client->m_hostname);
 907         qword_print(f, p);
 908         qword_printint(f, len);
 909         failed = qword_eol(f);
 910
 911         if (!failed)
 912                 failed = (fgets(buf, sizeof(buf), f) == NULL);
 913         fclose(f);
 914         if (failed)
 915                 return NULL;
 916         memset(fh.fh_handle, 0, sizeof(fh.fh_handle));
 917         fh.fh_size = qword_get(&bp, (char *)fh.fh_handle, NFS3_FHSIZE);
 918         return &fh;
 919 }
 920