utils/idmapd/idmapd.c

   1 /*
   2  *  idmapd.c
   3  *
   4  *  Userland daemon for idmap.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Marius Aamodt Eriksen <marius@umich.edu>
  10  *
  11  *  Redistribution and use in source and binary forms, with or without
  12  *  modification, are permitted provided that the following conditions
  13  *  are met:
  14  *
  15  *  1. Redistributions of source code must retain the above copyright
  16  *     notice, this list of conditions and the following disclaimer.
  17  *  2. Redistributions in binary form must reproduce the above copyright
  18  *     notice, this list of conditions and the following disclaimer in the
  19  *     documentation and/or other materials provided with the distribution.
  20  *  3. Neither the name of the University nor the names of its
  21  *     contributors may be used to endorse or promote products derived
  22  *     from this software without specific prior written permission.
  23  *
  24  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  25  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  26  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  27  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  31  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  32  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  33  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  34  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #include <sys/types.h>
  38 #include <sys/time.h>
  39 #include <sys/poll.h>
  40 #include <sys/socket.h>
  41 #include <sys/stat.h>
  42 #include <time.h>
  43
  44 #include "nfs_idmap.h"
  45
  46 #include <err.h>
  47 #include <errno.h>
  48 #include <event.h>
  49 #include <fcntl.h>
  50 #include <dirent.h>
  51 #include <unistd.h>
  52 #include <netdb.h>
  53 #include <signal.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57 #include <stdarg.h>
  58 #include <pwd.h>
  59 #include <grp.h>
  60 #include <limits.h>
  61 #include <ctype.h>
  62 #include <nfsidmap.h>
  63
  64 #ifdef HAVE_CONFIG_H
  65 #include "config.h"
  66 #endif /* HAVE_CONFIG_H */
  67
  68 #include "xlog.h"
  69 #include "cfg.h"
  70 #include "queue.h"
  71 #include "nfslib.h"
  72
  73 #ifndef PIPEFS_DIR
  74 #define PIPEFS_DIR  "/var/lib/nfs/rpc_pipefs/"
  75 #endif
  76
  77 #ifndef NFSD_DIR
  78 #define NFSD_DIR  "/proc/net/rpc"
  79 #endif
  80
  81 #ifndef CLIENT_CACHE_TIMEOUT_FILE
  82 #define CLIENT_CACHE_TIMEOUT_FILE "/proc/sys/fs/nfs/idmap_cache_timeout"
  83 #endif
  84
  85 #ifndef NFS4NOBODY_USER
  86 #define NFS4NOBODY_USER "nobody"
  87 #endif
  88
  89 #ifndef NFS4NOBODY_GROUP
  90 #define NFS4NOBODY_GROUP "nobody"
  91 #endif
  92
  93 /* From Niels */
  94 #define CONF_SAVE(w, f) do {                    \
  95         char *p = f;                            \
  96         if (p != NULL)                          \
  97                 (w) = p;                        \
  98 } while (0)
  99
 100 #define IC_IDNAME 0
 101 #define IC_IDNAME_CHAN  NFSD_DIR "/nfs4.idtoname/channel"
 102 #define IC_IDNAME_FLUSH NFSD_DIR "/nfs4.idtoname/flush"
 103
 104 #define IC_NAMEID 1
 105 #define IC_NAMEID_CHAN  NFSD_DIR "/nfs4.nametoid/channel"
 106 #define IC_NAMEID_FLUSH NFSD_DIR "/nfs4.nametoid/flush"
 107
 108 struct idmap_client {
 109         short                      ic_which;
 110         char                       ic_clid[30];
 111         char                      *ic_id;
 112         char                       ic_path[PATH_MAX];
 113         int                        ic_fd;
 114         int                        ic_dirfd;
 115         int                        ic_scanned;
 116         struct event               ic_event;
 117         TAILQ_ENTRY(idmap_client)  ic_next;
 118 };
 119 static struct idmap_client nfsd_ic[2] = {
 120 {IC_IDNAME, "Server", "", IC_IDNAME_CHAN, -1, -1, 0},
 121 {IC_NAMEID, "Server", "", IC_NAMEID_CHAN, -1, -1, 0},
 122 };
 123
 124 TAILQ_HEAD(idmap_clientq, idmap_client);
 125
 126 static void dirscancb(int, short, void *);
 127 static void clntscancb(int, short, void *);
 128 static void svrreopen(int, short, void *);
 129 static int  nfsopen(struct idmap_client *);
 130 static void nfscb(int, short, void *);
 131 static void nfsdcb(int, short, void *);
 132 static int  validateascii(char *, u_int32_t);
 133 static int  addfield(char **, ssize_t *, char *);
 134 static int  getfield(char **, char *, size_t);
 135
 136 static void imconv(struct idmap_client *, struct idmap_msg *);
 137 static void idtonameres(struct idmap_msg *);
 138 static void nametoidres(struct idmap_msg *);
 139
 140 static int nfsdopen(void);
 141 static int nfsdopenone(struct idmap_client *);
 142 static void nfsdreopen(void);
 143
 144 size_t  strlcat(char *, const char *, size_t);
 145 size_t  strlcpy(char *, const char *, size_t);
 146 ssize_t atomicio(ssize_t (*f) (int, void*, size_t),
 147                  int, void *, size_t);
 148 void    mydaemon(int, int);
 149 void    release_parent(void);
 150
 151 static int verbose = 0;
 152 #define DEFAULT_IDMAP_CACHE_EXPIRY 600 /* seconds */
 153 static int cache_entry_expiration = 0;
 154 static char pipefsdir[PATH_MAX];
 155 static char *nobodyuser, *nobodygroup;
 156 static uid_t nobodyuid;
 157 static gid_t nobodygid;
 158
 159 /* Used by cfg.c */
 160 char *conf_path;
 161
 162 static int
 163 flush_nfsd_cache(char *path, time_t now)
 164 {
 165         int fd;
 166         char stime[20];
 167
 168         sprintf(stime, "%ld\n", now);
 169         fd = open(path, O_RDWR);
 170         if (fd == -1)
 171                 return -1;
 172         write(fd, stime, strlen(stime));
 173         close(fd);
 174         return 0;
 175 }
 176
 177 static int
 178 flush_nfsd_idmap_cache(void)
 179 {
 180         time_t now = time(NULL);
 181         int ret;
 182
 183         ret = flush_nfsd_cache(IC_IDNAME_FLUSH, now);
 184         if (ret)
 185                 return ret;
 186         ret = flush_nfsd_cache(IC_NAMEID_FLUSH, now);
 187         return ret;
 188 }
 189
 190 int
 191 main(int argc, char **argv)
 192 {
 193         int fd = 0, opt, fg = 0, nfsdret = -1;
 194         struct idmap_clientq icq;
 195         struct event rootdirev, clntdirev, svrdirev;
 196         struct event initialize;
 197         struct passwd *pw;
 198         struct group *gr;
 199         struct stat sb;
 200         char *xpipefsdir = NULL;
 201         int serverstart = 1, clientstart = 1;
 202         int ret;
 203         char *progname;
 204
 205         conf_path = _PATH_IDMAPDCONF;
 206         nobodyuser = NFS4NOBODY_USER;
 207         nobodygroup = NFS4NOBODY_GROUP;
 208         strlcpy(pipefsdir, PIPEFS_DIR, sizeof(pipefsdir));
 209
 210         if ((progname = strrchr(argv[0], '/')))
 211                 progname++;
 212         else
 213                 progname = argv[0];
 214         xlog_open(progname);
 215
 216 #define GETOPTSTR "vfd:p:U:G:c:CS"
 217         opterr=0; /* Turn off error messages */
 218         while ((opt = getopt(argc, argv, GETOPTSTR)) != -1) {
 219                 if (opt == 'c')
 220                         conf_path = optarg;
 221                 if (opt == '?') {
 222                         if (strchr(GETOPTSTR, optopt))
 223                                 errx(1, "'-%c' option requires an argument.", optopt);
 224                         else
 225                                 errx(1, "'-%c' is an invalid argument.", optopt);
 226                 }
 227         }
 228         optind = 1;
 229
 230         if (stat(conf_path, &sb) == -1 && (errno == ENOENT || errno == EACCES)) {
 231                 warn("Skipping configuration file \"%s\"", conf_path);
 232                 conf_path = NULL;
 233         } else {
 234                 conf_init();
 235                 verbose = conf_get_num("General", "Verbosity", 0);
 236                 cache_entry_expiration = conf_get_num("General",
 237                                 "Cache-Expiration", DEFAULT_IDMAP_CACHE_EXPIRY);
 238                 CONF_SAVE(xpipefsdir, conf_get_str("General", "Pipefs-Directory"));
 239                 if (xpipefsdir != NULL)
 240                         strlcpy(pipefsdir, xpipefsdir, sizeof(pipefsdir));
 241                 CONF_SAVE(nobodyuser, conf_get_str("Mapping", "Nobody-User"));
 242                 CONF_SAVE(nobodygroup, conf_get_str("Mapping", "Nobody-Group"));
 243         }
 244
 245         while ((opt = getopt(argc, argv, GETOPTSTR)) != -1)
 246                 switch (opt) {
 247                 case 'v':
 248                         verbose++;
 249                         break;
 250                 case 'f':
 251                         fg = 1;
 252                         break;
 253                 case 'p':
 254                         strlcpy(pipefsdir, optarg, sizeof(pipefsdir));
 255                         break;
 256                 case 'd':
 257                 case 'U':
 258                 case 'G':
 259                         errx(1, "the -d, -U, and -G options have been removed;"
 260                                 " please use the configuration file instead.");
 261                 case 'C':
 262                         serverstart = 0;
 263                         break;
 264                 case 'S':
 265                         clientstart = 0;
 266                         break;
 267                 default:
 268                         break;
 269                 }
 270
 271         if (!serverstart && !clientstart)
 272                 errx(1, "it is illegal to specify both -C and -S");
 273
 274         strncat(pipefsdir, "/nfs", sizeof(pipefsdir));
 275
 276         if ((pw = getpwnam(nobodyuser)) == NULL)
 277                 errx(1, "Could not find user \"%s\"", nobodyuser);
 278         nobodyuid = pw->pw_uid;
 279
 280         if ((gr = getgrnam(nobodygroup)) == NULL)
 281                 errx(1, "Could not find group \"%s\"", nobodygroup);
 282         nobodygid = gr->gr_gid;
 283
 284 #ifdef HAVE_NFS4_SET_DEBUG
 285         nfs4_set_debug(verbose, xlog_warn);
 286 #endif
 287         if (conf_path == NULL)
 288                 conf_path = _PATH_IDMAPDCONF;
 289         if (nfs4_init_name_mapping(conf_path))
 290                 errx(1, "Unable to create name to user id mappings.");
 291
 292         if (!fg)
 293                 mydaemon(0, 0);
 294
 295         event_init();
 296
 297         if (verbose > 0)
 298                 xlog_warn("Expiration time is %d seconds.",
 299                              cache_entry_expiration);
 300         if (serverstart) {
 301                 nfsdret = nfsdopen();
 302                 if (nfsdret == 0) {
 303                         ret = flush_nfsd_idmap_cache();
 304                         if (ret)
 305                                 xlog_err("main: Failed to flush nfsd idmap cache\n: %s", strerror(errno));
 306                 }
 307         }
 308
 309         if (clientstart) {
 310                 struct timeval now = {
 311                         .tv_sec = 0,
 312                         .tv_usec = 0,
 313                 };
 314
 315                 if (cache_entry_expiration != DEFAULT_IDMAP_CACHE_EXPIRY) {
 316                         int timeout_fd, len;
 317                         char timeout_buf[12];
 318                         if ((timeout_fd = open(CLIENT_CACHE_TIMEOUT_FILE,
 319                                                O_RDWR)) == -1) {
 320                                 xlog_warn("Unable to open '%s' to set "
 321                                              "client cache expiration time "
 322                                              "to %d seconds\n",
 323                                              CLIENT_CACHE_TIMEOUT_FILE,
 324                                              cache_entry_expiration);
 325                         } else {
 326                                 len = snprintf(timeout_buf, sizeof(timeout_buf),
 327                                                "%d", cache_entry_expiration);
 328                                 if ((write(timeout_fd, timeout_buf, len)) != len)
 329                                         xlog_warn("Error writing '%s' to "
 330                                                      "'%s' to set client "
 331                                                      "cache expiration time\n",
 332                                                      timeout_buf,
 333                                                      CLIENT_CACHE_TIMEOUT_FILE);
 334                                 close(timeout_fd);
 335                         }
 336                 }
 337
 338                 if ((fd = open(pipefsdir, O_RDONLY)) == -1)
 339                         xlog_err("main: open(%s): %s", pipefsdir, strerror(errno));
 340
 341                 if (fcntl(fd, F_SETSIG, SIGUSR1) == -1)
 342                         xlog_err("main: fcntl(%s): %s", pipefsdir, strerror(errno));
 343
 344                 if (fcntl(fd, F_NOTIFY,
 345                         DN_CREATE | DN_DELETE | DN_MODIFY | DN_MULTISHOT) == -1) {
 346                         xlog_err("main: fcntl(%s): %s", pipefsdir, strerror(errno));
 347                         if (errno == EINVAL)
 348                                 xlog_err("main: Possibly no Dnotify support in kernel.");
 349                 }
 350                 TAILQ_INIT(&icq);
 351
 352                 /* These events are persistent */
 353                 signal_set(&rootdirev, SIGUSR1, dirscancb, &icq);
 354                 signal_add(&rootdirev, NULL);
 355                 signal_set(&clntdirev, SIGUSR2, clntscancb, &icq);
 356                 signal_add(&clntdirev, NULL);
 357                 signal_set(&svrdirev, SIGHUP, svrreopen, NULL);
 358                 signal_add(&svrdirev, NULL);
 359
 360                 /* Fetch current state */
 361                 /* (Delay till start of event_dispatch to avoid possibly losing
 362                  * a SIGUSR1 between here and the call to event_dispatch().) */
 363                 evtimer_set(&initialize, dirscancb, &icq);
 364                 evtimer_add(&initialize, &now);
 365         }
 366
 367         if (nfsdret != 0 && fd == 0)
 368                 xlog_err("main: Neither NFS client nor NFSd found");
 369
 370         release_parent();
 371
 372         if (event_dispatch() < 0)
 373                 xlog_err("main: event_dispatch returns errno %d (%s)",
 374                             errno, strerror(errno));
 375         /* NOTREACHED */
 376         return 1;
 377 }
 378
 379 static void
 380 dirscancb(int fd, short which, void *data)
 381 {
 382         int nent, i;
 383         struct dirent **ents;
 384         struct idmap_client *ic, *nextic;
 385         char path[PATH_MAX];
 386         struct idmap_clientq *icq = data;
 387
 388         nent = scandir(pipefsdir, &ents, NULL, alphasort);
 389         if (nent == -1) {
 390                 xlog_warn("dirscancb: scandir(%s): %s", pipefsdir, strerror(errno));
 391                 return;
 392         }
 393
 394         for (i = 0;  i < nent; i++) {
 395                 if (ents[i]->d_reclen > 4 &&
 396                     strncmp(ents[i]->d_name, "clnt", 4) == 0) {
 397                         TAILQ_FOREACH(ic, icq, ic_next)
 398                             if (strcmp(ents[i]->d_name + 4, ic->ic_clid) == 0)
 399                                     break;
 400                         if (ic != NULL)
 401                                 goto next;
 402
 403                         if ((ic = calloc(1, sizeof(*ic))) == NULL)
 404                                 goto out;
 405                         strlcpy(ic->ic_clid, ents[i]->d_name + 4,
 406                             sizeof(ic->ic_clid));
 407                         path[0] = '\0';
 408                         snprintf(path, sizeof(path), "%s/%s",
 409                             pipefsdir, ents[i]->d_name);
 410
 411                         if ((ic->ic_dirfd = open(path, O_RDONLY, 0)) == -1) {
 412                                 xlog_warn("dirscancb: open(%s): %s", path, strerror(errno));
 413                                 free(ic);
 414                                 goto out;
 415                         }
 416
 417                         strlcat(path, "/idmap", sizeof(path));
 418                         strlcpy(ic->ic_path, path, sizeof(ic->ic_path));
 419
 420                         if (verbose > 0)
 421                                 xlog_warn("New client: %s", ic->ic_clid);
 422
 423                         if (nfsopen(ic) == -1) {
 424                                 close(ic->ic_dirfd);
 425                                 free(ic);
 426                                 goto out;
 427                         }
 428
 429                         ic->ic_id = "Client";
 430
 431                         TAILQ_INSERT_TAIL(icq, ic, ic_next);
 432
 433                 next:
 434                         ic->ic_scanned = 1;
 435                 }
 436         }
 437
 438         ic = TAILQ_FIRST(icq);
 439         while(ic != NULL) {
 440                 nextic=TAILQ_NEXT(ic, ic_next);
 441                 if (!ic->ic_scanned) {
 442                         event_del(&ic->ic_event);
 443                         close(ic->ic_fd);
 444                         close(ic->ic_dirfd);
 445                         TAILQ_REMOVE(icq, ic, ic_next);
 446                         if (verbose > 0) {
 447                                 xlog_warn("Stale client: %s", ic->ic_clid);
 448                                 xlog_warn("\t-> closed %s", ic->ic_path);
 449                         }
 450                         free(ic);
 451                 } else
 452                         ic->ic_scanned = 0;
 453                 ic = nextic;
 454         }
 455
 456 out:
 457         for (i = 0;  i < nent; i++)
 458                 free(ents[i]);
 459         free(ents);
 460         return;
 461 }
 462
 463 static void
 464 svrreopen(int fd, short which, void *data)
 465 {
 466         nfsdreopen();
 467 }
 468
 469 static void
 470 clntscancb(int fd, short which, void *data)
 471 {
 472         struct idmap_clientq *icq = data;
 473         struct idmap_client *ic;
 474
 475         TAILQ_FOREACH(ic, icq, ic_next)
 476                 if (ic->ic_fd == -1 && nfsopen(ic) == -1) {
 477                         close(ic->ic_dirfd);
 478                         TAILQ_REMOVE(icq, ic, ic_next);
 479                         free(ic);
 480                 }
 481 }
 482
 483 static void
 484 nfsdcb(int fd, short which, void *data)
 485 {
 486         struct idmap_client *ic = data;
 487         struct idmap_msg im;
 488         u_char buf[IDMAP_MAXMSGSZ + 1];
 489         size_t len;
 490         ssize_t bsiz;
 491         char *bp, typebuf[IDMAP_MAXMSGSZ],
 492                 buf1[IDMAP_MAXMSGSZ], authbuf[IDMAP_MAXMSGSZ], *p;
 493         unsigned long tmp;
 494
 495         if (which != EV_READ)
 496                 goto out;
 497
 498         if ((len = read(ic->ic_fd, buf, sizeof(buf))) <= 0) {
 499                 xlog_warn("nfsdcb: read(%s) failed: errno %d (%s)",
 500                              ic->ic_path, len?errno:0,
 501                              len?strerror(errno):"End of File");
 502                 goto out;
 503         }
 504
 505         /* Get rid of newline and terminate buffer*/
 506         buf[len - 1] = '\0';
 507         bp = (char *)buf;
 508
 509         memset(&im, 0, sizeof(im));
 510
 511         /* Authentication name -- ignored for now*/
 512         if (getfield(&bp, authbuf, sizeof(authbuf)) == -1) {
 513                 xlog_warn("nfsdcb: bad authentication name in upcall\n");
 514                 return;
 515         }
 516         if (getfield(&bp, typebuf, sizeof(typebuf)) == -1) {
 517                 xlog_warn("nfsdcb: bad type in upcall\n");
 518                 return;
 519         }
 520         if (verbose > 0)
 521                 xlog_warn("nfsdcb: authbuf=%s authtype=%s",
 522                              authbuf, typebuf);
 523
 524         im.im_type = strcmp(typebuf, "user") == 0 ?
 525                 IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
 526
 527         switch (ic->ic_which) {
 528         case IC_NAMEID:
 529                 im.im_conv = IDMAP_CONV_NAMETOID;
 530                 if (getfield(&bp, im.im_name, sizeof(im.im_name)) == -1) {
 531                         xlog_warn("nfsdcb: bad name in upcall\n");
 532                         return;
 533                 }
 534                 break;
 535         case IC_IDNAME:
 536                 im.im_conv = IDMAP_CONV_IDTONAME;
 537                 if (getfield(&bp, buf1, sizeof(buf1)) == -1) {
 538                         xlog_warn("nfsdcb: bad id in upcall\n");
 539                         return;
 540                 }
 541                 tmp = strtoul(buf1, (char **)NULL, 10);
 542                 im.im_id = (u_int32_t)tmp;
 543                 if ((tmp == ULONG_MAX && errno == ERANGE)
 544                                 || (unsigned long)im.im_id != tmp) {
 545                         xlog_warn("nfsdcb: id '%s' too big!\n", buf1);
 546                         return;
 547                 }
 548                 break;
 549         default:
 550                 xlog_warn("nfsdcb: Unknown which type %d", ic->ic_which);
 551                 return;
 552         }
 553
 554         imconv(ic, &im);
 555
 556         buf[0] = '\0';
 557         bp = (char *)buf;
 558         bsiz = sizeof(buf);
 559
 560         /* Authentication name */
 561         addfield(&bp, &bsiz, authbuf);
 562
 563         switch (ic->ic_which) {
 564         case IC_NAMEID:
 565                 /* Type */
 566                 p = im.im_type == IDMAP_TYPE_USER ? "user" : "group";
 567                 addfield(&bp, &bsiz, p);
 568                 /* Name */
 569                 addfield(&bp, &bsiz, im.im_name);
 570                 /* expiry */
 571                 snprintf(buf1, sizeof(buf1), "%lu",
 572                          time(NULL) + cache_entry_expiration);
 573                 addfield(&bp, &bsiz, buf1);
 574                 /* Note that we don't want to write the id if the mapping
 575                  * failed; instead, by leaving it off, we write a negative
 576                  * cache entry which will result in an error returned to
 577                  * the client.  We don't want a chown or setacl referring
 578                  * to an unknown user to result in giving permissions to
 579                  * "nobody"! */
 580                 if (im.im_status == IDMAP_STATUS_SUCCESS) {
 581                         /* ID */
 582                         snprintf(buf1, sizeof(buf1), "%u", im.im_id);
 583                         addfield(&bp, &bsiz, buf1);
 584
 585                 }
 586                 //if (bsiz == sizeof(buf)) /* XXX */
 587
 588                 bp[-1] = '\n';
 589
 590                 break;
 591         case IC_IDNAME:
 592                 /* Type */
 593                 p = im.im_type == IDMAP_TYPE_USER ? "user" : "group";
 594                 addfield(&bp, &bsiz, p);
 595                 /* ID */
 596                 snprintf(buf1, sizeof(buf1), "%u", im.im_id);
 597                 addfield(&bp, &bsiz, buf1);
 598                 /* expiry */
 599                 snprintf(buf1, sizeof(buf1), "%lu",
 600                          time(NULL) + cache_entry_expiration);
 601                 addfield(&bp, &bsiz, buf1);
 602                 /* Note we're ignoring the status field in this case; we'll
 603                  * just map to nobody instead. */
 604                 /* Name */
 605                 addfield(&bp, &bsiz, im.im_name);
 606
 607                 bp[-1] = '\n';
 608
 609                 break;
 610         default:
 611                 xlog_warn("nfsdcb: Unknown which type %d", ic->ic_which);
 612                 return;
 613         }
 614
 615         bsiz = sizeof(buf) - bsiz;
 616
 617         if (atomicio((void*)write, ic->ic_fd, buf, bsiz) != bsiz)
 618                 xlog_warn("nfsdcb: write(%s) failed: errno %d (%s)",
 619                              ic->ic_path, errno, strerror(errno));
 620
 621 out:
 622         event_add(&ic->ic_event, NULL);
 623 }
 624
 625 static void
 626 imconv(struct idmap_client *ic, struct idmap_msg *im)
 627 {
 628         switch (im->im_conv) {
 629         case IDMAP_CONV_IDTONAME:
 630                 idtonameres(im);
 631                 if (verbose > 1)
 632                         xlog_warn("%s %s: (%s) id \"%d\" -> name \"%s\"",
 633                             ic->ic_id, ic->ic_clid,
 634                             im->im_type == IDMAP_TYPE_USER ? "user" : "group",
 635                             im->im_id, im->im_name);
 636                 break;
 637         case IDMAP_CONV_NAMETOID:
 638                 if (validateascii(im->im_name, sizeof(im->im_name)) == -1) {
 639                         im->im_status |= IDMAP_STATUS_INVALIDMSG;
 640                         return;
 641                 }
 642                 nametoidres(im);
 643                 if (verbose > 1)
 644                         xlog_warn("%s %s: (%s) name \"%s\" -> id \"%d\"",
 645                             ic->ic_id, ic->ic_clid,
 646                             im->im_type == IDMAP_TYPE_USER ? "user" : "group",
 647                             im->im_name, im->im_id);
 648                 break;
 649         default:
 650                 xlog_warn("imconv: Invalid conversion type (%d) in message",
 651                              im->im_conv);
 652                 im->im_status |= IDMAP_STATUS_INVALIDMSG;
 653                 break;
 654         }
 655 }
 656
 657 static void
 658 nfscb(int fd, short which, void *data)
 659 {
 660         struct idmap_client *ic = data;
 661         struct idmap_msg im;
 662
 663         if (which != EV_READ)
 664                 goto out;
 665
 666         if (atomicio(read, ic->ic_fd, &im, sizeof(im)) != sizeof(im)) {
 667                 if (verbose > 0)
 668                         xlog_warn("nfscb: read(%s): %s", ic->ic_path, strerror(errno));
 669                 if (errno == EPIPE)
 670                         return;
 671                 goto out;
 672         }
 673
 674         imconv(ic, &im);
 675
 676         /* XXX: I don't like ignoring this error in the id->name case,
 677          * but we've never returned it, and I need to check that the client
 678          * can handle it gracefully before starting to return it now. */
 679
 680         if (im.im_status == IDMAP_STATUS_LOOKUPFAIL)
 681                 im.im_status = IDMAP_STATUS_SUCCESS;
 682
 683         if (atomicio((void*)write, ic->ic_fd, &im, sizeof(im)) != sizeof(im))
 684                 xlog_warn("nfscb: write(%s): %s", ic->ic_path, strerror(errno));
 685 out:
 686         event_add(&ic->ic_event, NULL);
 687 }
 688
 689 static void
 690 nfsdreopen_one(struct idmap_client *ic)
 691 {
 692         int fd;
 693
 694         if (verbose > 0)
 695                 xlog_warn("ReOpening %s", ic->ic_path);
 696
 697         if ((fd = open(ic->ic_path, O_RDWR, 0)) != -1) {
 698                 if ((ic->ic_event.ev_flags & EVLIST_INIT))
 699                         event_del(&ic->ic_event);
 700                 if (ic->ic_fd != -1)
 701                         close(ic->ic_fd);
 702
 703                 ic->ic_event.ev_fd = ic->ic_fd = fd;
 704                 event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfsdcb, ic);
 705                 event_add(&ic->ic_event, NULL);
 706         } else {
 707                 xlog_warn("nfsdreopen: Opening '%s' failed: errno %d (%s)",
 708                         ic->ic_path, errno, strerror(errno));
 709         }
 710 }
 711
 712 static void
 713 nfsdreopen()
 714 {
 715         nfsdreopen_one(&nfsd_ic[IC_NAMEID]);
 716         nfsdreopen_one(&nfsd_ic[IC_IDNAME]);
 717         return;
 718 }
 719
 720 static int
 721 nfsdopen(void)
 722 {
 723         return ((nfsdopenone(&nfsd_ic[IC_NAMEID]) == 0 &&
 724                     nfsdopenone(&nfsd_ic[IC_IDNAME]) == 0) ? 0 : -1);
 725 }
 726
 727 static int
 728 nfsdopenone(struct idmap_client *ic)
 729 {
 730         if ((ic->ic_fd = open(ic->ic_path, O_RDWR, 0)) == -1) {
 731                 if (verbose > 0)
 732                         xlog_warn("nfsdopenone: Opening %s failed: "
 733                                 "errno %d (%s)",
 734                                 ic->ic_path, errno, strerror(errno));
 735                 return (-1);
 736         }
 737
 738         event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfsdcb, ic);
 739         event_add(&ic->ic_event, NULL);
 740
 741         if (verbose > 0)
 742                 xlog_warn("Opened %s", ic->ic_path);
 743
 744         return (0);
 745 }
 746
 747 static int
 748 nfsopen(struct idmap_client *ic)
 749 {
 750         if ((ic->ic_fd = open(ic->ic_path, O_RDWR, 0)) == -1) {
 751                 switch (errno) {
 752                 case ENOENT:
 753                         fcntl(ic->ic_dirfd, F_SETSIG, SIGUSR2);
 754                         fcntl(ic->ic_dirfd, F_NOTIFY,
 755                             DN_CREATE | DN_DELETE | DN_MULTISHOT);
 756                         break;
 757                 default:
 758                         xlog_warn("nfsopen: open(%s): %s", ic->ic_path, strerror(errno));
 759                         return (-1);
 760                 }
 761         } else {
 762                 event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfscb, ic);
 763                 event_add(&ic->ic_event, NULL);
 764                 fcntl(ic->ic_dirfd, F_SETSIG, 0);
 765                 fcntl(ic->ic_dirfd, F_NOTIFY, 0);
 766                 if (verbose > 0)
 767                         xlog_warn("Opened %s", ic->ic_path);
 768         }
 769
 770         return (0);
 771 }
 772
 773 static void
 774 idtonameres(struct idmap_msg *im)
 775 {
 776         char domain[NFS4_MAX_DOMAIN_LEN];
 777         int ret = 0;
 778
 779         ret = nfs4_get_default_domain(NULL, domain, sizeof(domain));
 780         switch (im->im_type) {
 781         case IDMAP_TYPE_USER:
 782                 ret = nfs4_uid_to_name(im->im_id, domain, im->im_name,
 783                                 sizeof(im->im_name));
 784                 if (ret) {
 785                         if (strlen(nobodyuser) < sizeof(im->im_name))
 786                                 strcpy(im->im_name, nobodyuser);
 787                         else
 788                                 strcpy(im->im_name, NFS4NOBODY_USER);
 789                 }
 790                 break;
 791         case IDMAP_TYPE_GROUP:
 792                 ret = nfs4_gid_to_name(im->im_id, domain, im->im_name,
 793                                 sizeof(im->im_name));
 794                 if (ret) {
 795                         if (strlen(nobodygroup) < sizeof(im->im_name))
 796                                 strcpy(im->im_name, nobodygroup);
 797                         else
 798                                 strcpy(im->im_name, NFS4NOBODY_GROUP);
 799                 }
 800                 break;
 801         }
 802         if (ret)
 803                 im->im_status = IDMAP_STATUS_LOOKUPFAIL;
 804         else
 805                 im->im_status = IDMAP_STATUS_SUCCESS;
 806 }
 807
 808 static void
 809 nametoidres(struct idmap_msg *im)
 810 {
 811         uid_t uid;
 812         gid_t gid;
 813         int ret = 0;
 814
 815         /* XXX: move nobody stuff to library calls
 816          * (nfs4_get_nobody_user(domain), nfs4_get_nobody_group(domain)) */
 817
 818         im->im_status = IDMAP_STATUS_SUCCESS;
 819
 820         switch (im->im_type) {
 821         case IDMAP_TYPE_USER:
 822                 ret = nfs4_name_to_uid(im->im_name, &uid);
 823                 im->im_id = (u_int32_t) uid;
 824                 if (ret) {
 825                         im->im_status = IDMAP_STATUS_LOOKUPFAIL;
 826                         im->im_id = nobodyuid;
 827                 }
 828                 return;
 829         case IDMAP_TYPE_GROUP:
 830                 ret = nfs4_name_to_gid(im->im_name, &gid);
 831                 im->im_id = (u_int32_t) gid;
 832                 if (ret) {
 833                         im->im_status = IDMAP_STATUS_LOOKUPFAIL;
 834                         im->im_id = nobodygid;
 835                 }
 836                 return;
 837         }
 838 }
 839
 840 static int
 841 validateascii(char *string, u_int32_t len)
 842 {
 843         int i;
 844
 845         for (i = 0; i < len; i++) {
 846                 if (string[i] == '\0')
 847                         break;
 848
 849                 if (string[i] & 0x80)
 850                         return (-1);
 851         }
 852
 853         if ((i >= len) || string[i] != '\0')
 854                 return (-1);
 855
 856         return (i + 1);
 857 }
 858
 859 static int
 860 addfield(char **bpp, ssize_t *bsizp, char *fld)
 861 {
 862         char ch, *bp = *bpp;
 863         ssize_t bsiz = *bsizp;
 864
 865         while ((ch = *fld++) != '\0' && bsiz > 0) {
 866                 switch(ch) {
 867                 case ' ':
 868                 case '\t':
 869                 case '\n':
 870                 case '\\':
 871                         if (bsiz >= 4) {
 872                                 bp += snprintf(bp, bsiz, "\\%03o", ch);
 873                                 bsiz -= 4;
 874                         }
 875                         break;
 876                 default:
 877                         *bp++ = ch;
 878                         bsiz--;
 879                         break;
 880                 }
 881         }
 882
 883         if (bsiz < 1 || ch != '\0')
 884                 return (-1);
 885
 886         *bp++ = ' ';
 887         bsiz--;
 888
 889         *bpp = bp;
 890         *bsizp = bsiz;
 891
 892         return (0);
 893 }
 894
 895 static int
 896 getfield(char **bpp, char *fld, size_t fldsz)
 897 {
 898         char *bp;
 899         u_int val, n;
 900
 901         while ((bp = strsep(bpp, " ")) != NULL && bp[0] == '\0')
 902                 ;
 903
 904         if (bp == NULL || bp[0] == '\0' || bp[0] == '\n')
 905                 return (-1);
 906
 907         while (*bp != '\0' && fldsz > 1) {
 908                 if (*bp == '\\') {
 909                         if ((n = sscanf(bp, "\\%03o", &val)) != 1)
 910                                 return (-1);
 911                         if (val > (char)-1)
 912                                 return (-1);
 913                         *fld++ = (char)val;
 914                         bp += 4;
 915                 } else {
 916                         *fld++ = *bp;
 917                         bp++;
 918                 }
 919                 fldsz--;
 920         }
 921
 922         if (*bp != '\0')
 923                 return (-1);
 924         *fld = '\0';
 925
 926         return (0);
 927 }
 928 /*
 929  * mydaemon creates a pipe between the partent and child
 930  * process. The parent process will wait until the
 931  * child dies or writes a '1' on the pipe signaling
 932  * that it started successfully.
 933  */
 934 int pipefds[2] = { -1, -1};
 935
 936 void
 937 mydaemon(int nochdir, int noclose)
 938 {
 939         int pid, status, tempfd;
 940
 941         if (pipe(pipefds) < 0)
 942                 err(1, "mydaemon: pipe() failed: errno %d", errno);
 943
 944         if ((pid = fork ()) < 0)
 945                 err(1, "mydaemon: fork() failed: errno %d", errno);
 946
 947         if (pid != 0) {
 948                 /*
 949                  * Parent. Wait for status from child.
 950                  */
 951                 close(pipefds[1]);
 952                 if (read(pipefds[0], &status, 1) != 1)
 953                         exit(1);
 954                 exit (0);
 955         }
 956         /* Child.       */
 957         close(pipefds[0]);
 958         setsid ();
 959         if (nochdir == 0) {
 960                 if (chdir ("/") == -1)
 961                         err(1, "mydaemon: chdir() failed: errno %d", errno);
 962         }
 963
 964         while (pipefds[1] <= 2) {
 965                 pipefds[1] = dup(pipefds[1]);
 966                 if (pipefds[1] < 0)
 967                         err(1, "mydaemon: dup() failed: errno %d", errno);
 968         }
 969
 970         if (noclose == 0) {
 971                 tempfd = open("/dev/null", O_RDWR);
 972                 if (tempfd < 0)
 973                         tempfd = open("/", O_RDONLY);
 974                 if (tempfd >= 0) {
 975                         dup2(tempfd, 0);
 976                         dup2(tempfd, 1);
 977                         dup2(tempfd, 2);
 978                         closeall(3);
 979                 } else
 980                         closeall(0);
 981         }
 982
 983         return;
 984 }
 985 void
 986 release_parent(void)
 987 {
 988         int status;
 989
 990         if (pipefds[1] > 0) {
 991                 write(pipefds[1], &status, 1);
 992                 close(pipefds[1]);
 993                 pipefds[1] = -1;
 994         }
 995 }