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 <pwd.h>
  58 #include <grp.h>
  59 #include <limits.h>
  60 #include <ctype.h>
  61 #include <nfsidmap.h>
  62
  63 #ifdef HAVE_CONFIG_H
  64 #include "config.h"
  65 #endif /* HAVE_CONFIG_H */
  66
  67 #include "cfg.h"
  68 #include "queue.h"
  69 #include "nfslib.h"
  70
  71 #ifndef PIPEFS_DIR
  72 #define PIPEFS_DIR  "/var/lib/nfs/rpc_pipefs/"
  73 #endif
  74
  75 #ifndef NFSD_DIR
  76 #define NFSD_DIR  "/proc/net/rpc"
  77 #endif
  78
  79 #ifndef NFS4NOBODY_USER
  80 #define NFS4NOBODY_USER "nobody"
  81 #endif
  82
  83 #ifndef NFS4NOBODY_GROUP
  84 #define NFS4NOBODY_GROUP "nobody"
  85 #endif
  86
  87 /* From Niels */
  88 #define CONF_SAVE(w, f) do {                    \
  89         char *p = f;                            \
  90         if (p != NULL)                          \
  91                 (w) = p;                        \
  92 } while (0)
  93
  94 #define IC_IDNAME 1
  95 #define IC_NAMEID 2
  96 struct idmap_client {
  97         int                        ic_fd;
  98         int                        ic_dirfd;
  99         char                       ic_clid[30];
 100         char                       ic_path[PATH_MAX];
 101         int                        ic_scanned;
 102         struct event               ic_event;
 103         char                      *ic_id;
 104         short                      ic_which;
 105         TAILQ_ENTRY(idmap_client)  ic_next;
 106 };
 107
 108 TAILQ_HEAD(idmap_clientq, idmap_client);
 109
 110 static void dirscancb(int, short, void *);
 111 static void clntscancb(int, short, void *);
 112 static void svrreopen(int, short, void *);
 113 static int  nfsopen(struct idmap_client *);
 114 static void nfscb(int, short, void *);
 115 static void nfsdcb(int, short, void *);
 116 static int  validateascii(char *, u_int32_t);
 117 static int  addfield(char **, ssize_t *, char *);
 118 static int  getfield(char **, char *, size_t);
 119
 120 static void imconv(struct idmap_client *, struct idmap_msg *);
 121 static void idtonameres(struct idmap_msg *);
 122 static void nametoidres(struct idmap_msg *);
 123
 124 static int nfsdopen(char *);
 125 static int nfsdopenone(struct idmap_client *, short, char *);
 126 static void nfsdreopen(void);
 127
 128 size_t  strlcat(char *, const char *, size_t);
 129 size_t  strlcpy(char *, const char *, size_t);
 130 ssize_t atomicio(ssize_t (*)(), int, void *, size_t);
 131 void    mydaemon(int, int);
 132 void    release_parent();
 133
 134 static int verbose = 0;
 135 static char pipefsdir[PATH_MAX];
 136 static char *nobodyuser, *nobodygroup;
 137 static uid_t nobodyuid;
 138 static gid_t nobodygid;
 139 static struct idmap_client nfsd_ic[2];
 140
 141 /* Used by cfg.c */
 142 char *conf_path;
 143
 144 int
 145 main(int argc, char **argv)
 146 {
 147         int fd = 0, opt, fg = 0, nfsdret = -1;
 148         struct idmap_clientq icq;
 149         struct event rootdirev, clntdirev, svrdirev;
 150         struct event initialize;
 151         struct passwd *pw;
 152         struct group *gr;
 153         struct stat sb;
 154         char *xpipefsdir = NULL;
 155         int serverstart = 1, clientstart = 1;
 156
 157         conf_path = _PATH_IDMAPDCONF;
 158         nobodyuser = NFS4NOBODY_USER;
 159         nobodygroup = NFS4NOBODY_GROUP;
 160         strlcpy(pipefsdir, PIPEFS_DIR, sizeof(pipefsdir));
 161
 162 #define GETOPTSTR "vfd:p:U:G:c:CS"
 163         opterr=0; /* Turn off error messages */
 164         while ((opt = getopt(argc, argv, GETOPTSTR)) != -1) {
 165                 if (opt == 'c')
 166                         conf_path = optarg;
 167                 if (opt == '?') {
 168                         if (strchr(GETOPTSTR, optopt))
 169                                 errx(1, "'-%c' option requires an argument.", optopt);
 170                         else
 171                                 errx(1, "'-%c' is an invalid argument.", optopt);
 172                 }
 173         }
 174         optind = 1;
 175
 176         if (stat(conf_path, &sb) == -1 && (errno == ENOENT || errno == EACCES)) {
 177                 warn("Skipping configuration file \"%s\"", conf_path);
 178         } else {
 179                 conf_init();
 180                 verbose = conf_get_num("General", "Verbosity", 0);
 181                 CONF_SAVE(xpipefsdir, conf_get_str("General", "Pipefs-Directory"));
 182                 if (xpipefsdir != NULL)
 183                         strlcpy(pipefsdir, xpipefsdir, sizeof(pipefsdir));
 184                 CONF_SAVE(nobodyuser, conf_get_str("Mapping", "Nobody-User"));
 185                 CONF_SAVE(nobodygroup, conf_get_str("Mapping", "Nobody-Group"));
 186                 nfs4_init_name_mapping(conf_path);
 187         }
 188
 189         while ((opt = getopt(argc, argv, GETOPTSTR)) != -1)
 190                 switch (opt) {
 191                 case 'v':
 192                         verbose++;
 193                         break;
 194                 case 'f':
 195                         fg = 1;
 196                         break;
 197                 case 'p':
 198                         strlcpy(pipefsdir, optarg, sizeof(pipefsdir));
 199                         break;
 200                 case 'd':
 201                 case 'U':
 202                 case 'G':
 203                         errx(1, "the -d, -U, and -G options have been removed;"
 204                                 " please use the configuration file instead.");
 205                 case 'C':
 206                         serverstart = 0;
 207                         break;
 208                 case 'S':
 209                         clientstart = 0;
 210                         break;
 211                 default:
 212                         break;
 213                 }
 214
 215         if (!serverstart && !clientstart)
 216                 errx(1, "it is illegal to specify both -C and -S");
 217
 218         strncat(pipefsdir, "/nfs", sizeof(pipefsdir));
 219
 220         if ((pw = getpwnam(nobodyuser)) == NULL)
 221                 errx(1, "Could not find user \"%s\"", nobodyuser);
 222         nobodyuid = pw->pw_uid;
 223
 224         if ((gr = getgrnam(nobodygroup)) == NULL)
 225                 errx(1, "Could not find group \"%s\"", nobodygroup);
 226         nobodygid = gr->gr_gid;
 227
 228         if (!fg)
 229                 mydaemon(0, 0);
 230
 231         event_init();
 232
 233         if (serverstart)
 234                 nfsdret = nfsdopen(NFSD_DIR);
 235
 236         if (clientstart) {
 237                 struct timeval now = {
 238                         .tv_sec = 0,
 239                         .tv_usec = 0,
 240                 };
 241
 242                 if ((fd = open(pipefsdir, O_RDONLY)) == -1)
 243                         err(1, "open(%s)", pipefsdir);
 244
 245                 if (fcntl(fd, F_SETSIG, SIGUSR1) == -1)
 246                         err(1, "fcntl(%s)", pipefsdir);
 247                 if (fcntl(fd, F_NOTIFY,
 248                         DN_CREATE | DN_DELETE | DN_MODIFY | DN_MULTISHOT) == -1)
 249                         err(1, "fcntl(%s)", pipefsdir);
 250
 251                 TAILQ_INIT(&icq);
 252
 253                 /* These events are persistent */
 254                 signal_set(&rootdirev, SIGUSR1, dirscancb, &icq);
 255                 signal_add(&rootdirev, NULL);
 256                 signal_set(&clntdirev, SIGUSR2, clntscancb, &icq);
 257                 signal_add(&clntdirev, NULL);
 258                 signal_set(&svrdirev, SIGHUP, svrreopen, NULL);
 259                 signal_add(&svrdirev, NULL);
 260
 261                 /* Fetch current state */
 262                 /* (Delay till start of event_dispatch to avoid possibly losing
 263                  * a SIGUSR1 between here and the call to event_dispatch().) */
 264                 evtimer_set(&initialize, dirscancb, &icq);
 265                 evtimer_add(&initialize, &now);
 266         }
 267
 268         if (nfsdret != 0 && fd == 0)
 269                 errx(1, "Neither NFS client nor NFSd found");
 270
 271         release_parent();
 272
 273         if (event_dispatch() < 0)
 274                 errx(1, "event_dispatch: returns errno %d (%s)", errno, strerror(errno));
 275         /* NOTREACHED */
 276         return 1;
 277 }
 278
 279 static void
 280 dirscancb(int fd, short which, void *data)
 281 {
 282         int nent, i;
 283         struct dirent **ents;
 284         struct idmap_client *ic;
 285         char path[PATH_MAX];
 286         struct idmap_clientq *icq = data;
 287
 288         nent = scandir(pipefsdir, &ents, NULL, alphasort);
 289         if (nent == -1) {
 290                 warn("scandir(%s)", pipefsdir);
 291                 return;
 292         }
 293
 294         for (i = 0;  i < nent; i++) {
 295                 if (ents[i]->d_reclen > 4 &&
 296                     strncmp(ents[i]->d_name, "clnt", 4) == 0) {
 297                         TAILQ_FOREACH(ic, icq, ic_next)
 298                             if (strcmp(ents[i]->d_name + 4, ic->ic_clid) == 0)
 299                                     break;
 300                         if (ic != NULL)
 301                                 goto next;
 302
 303                         if ((ic = calloc(1, sizeof(*ic))) == NULL)
 304                                 return;
 305                         strlcpy(ic->ic_clid, ents[i]->d_name + 4,
 306                             sizeof(ic->ic_clid));
 307                         path[0] = '\0';
 308                         snprintf(path, sizeof(path), "%s/%s",
 309                             pipefsdir, ents[i]->d_name);
 310
 311                         if ((ic->ic_dirfd = open(path, O_RDONLY, 0)) == -1) {
 312                                 warn("open(%s)", path);
 313                                 free(ic);
 314                                 return;
 315                         }
 316
 317                         strlcat(path, "/idmap", sizeof(path));
 318                         strlcpy(ic->ic_path, path, sizeof(ic->ic_path));
 319
 320                         if (verbose > 0)
 321                                 warnx("New client: %s", ic->ic_clid);
 322
 323                         if (nfsopen(ic) == -1) {
 324                                 close(ic->ic_dirfd);
 325                                 free(ic);
 326                                 return;
 327                         }
 328
 329                         ic->ic_id = "Client";
 330
 331                         TAILQ_INSERT_TAIL(icq, ic, ic_next);
 332
 333                 next:
 334                         ic->ic_scanned = 1;
 335                 }
 336         }
 337
 338         TAILQ_FOREACH(ic, icq, ic_next) {
 339                 if (!ic->ic_scanned) {
 340                         event_del(&ic->ic_event);
 341                         close(ic->ic_fd);
 342                         close(ic->ic_dirfd);
 343                         TAILQ_REMOVE(icq, ic, ic_next);
 344                         if (verbose > 0) {
 345                                 warnx("Stale client: %s", ic->ic_clid);
 346                                 warnx("\t-> closed %s", ic->ic_path);
 347                         }
 348                         free(ic);
 349                 } else
 350                         ic->ic_scanned = 0;
 351         }
 352         return;
 353 }
 354
 355 static void
 356 svrreopen(int fd, short which, void *data)
 357 {
 358         nfsdreopen();
 359 }
 360
 361 static void
 362 clntscancb(int fd, short which, void *data)
 363 {
 364         struct idmap_clientq *icq = data;
 365         struct idmap_client *ic;
 366
 367         TAILQ_FOREACH(ic, icq, ic_next)
 368                 if (ic->ic_fd == -1 && nfsopen(ic) == -1) {
 369                         close(ic->ic_dirfd);
 370                         TAILQ_REMOVE(icq, ic, ic_next);
 371                         free(ic);
 372                 }
 373 }
 374
 375 static void
 376 nfsdcb(int fd, short which, void *data)
 377 {
 378         struct idmap_client *ic = data;
 379         struct idmap_msg im;
 380         u_char buf[IDMAP_MAXMSGSZ + 1];
 381         size_t len, bsiz;
 382         char *bp, typebuf[IDMAP_MAXMSGSZ],
 383                 buf1[IDMAP_MAXMSGSZ], authbuf[IDMAP_MAXMSGSZ], *p;
 384
 385         if (which != EV_READ)
 386                 goto out;
 387
 388         if ((len = read(ic->ic_fd, buf, sizeof(buf))) == -1) {
 389                 warnx("nfsdcb: read(%s) failed: errno %d (%s)",
 390                         ic->ic_path, errno, strerror(errno));
 391                 goto out;
 392         }
 393
 394         /* Get rid of newline and terminate buffer*/
 395         buf[len - 1] = '\0';
 396         bp = buf;
 397
 398         memset(&im, 0, sizeof(im));
 399
 400         /* Authentication name -- ignored for now*/
 401         if (getfield(&bp, authbuf, sizeof(authbuf)) == -1) {
 402                 warnx("nfsdcb: bad authentication name in upcall\n");
 403                 return;
 404         }
 405         if (getfield(&bp, typebuf, sizeof(typebuf)) == -1) {
 406                 warnx("nfsdcb: bad type in upcall\n");
 407                 return;
 408         }
 409         if (verbose > 0)
 410                 warnx("nfsdcb: authbuf=%s authtype=%s", authbuf, typebuf);
 411
 412         im.im_type = strcmp(typebuf, "user") == 0 ?
 413                 IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
 414
 415         switch (ic->ic_which) {
 416         case IC_NAMEID:
 417                 im.im_conv = IDMAP_CONV_NAMETOID;
 418                 if (getfield(&bp, im.im_name, sizeof(im.im_name)) == -1) {
 419                         warnx("nfsdcb: bad name in upcall\n");
 420                         return;
 421                 }
 422                 break;
 423         case IC_IDNAME:
 424                 im.im_conv = IDMAP_CONV_IDTONAME;
 425                 if (getfield(&bp, buf1, sizeof(buf1)) == -1) {
 426                         warnx("nfsdcb: bad id in upcall\n");
 427                         return;
 428                 }
 429                 if ((im.im_id = strtoul(buf1, (char **)NULL, 10)) == ULONG_MAX &&
 430                     errno == ERANGE) {
 431                         warnx("nfsdcb: id '%s' too big!\n", buf1);
 432                         return;
 433                 }
 434
 435                 break;
 436         default:
 437                 warnx("Unknown which type %d", ic->ic_which);
 438                 return;
 439         }
 440
 441         imconv(ic, &im);
 442
 443         buf[0] = '\0';
 444         bp = buf;
 445         bsiz = sizeof(buf);
 446
 447         /* Authentication name */
 448         addfield(&bp, &bsiz, authbuf);
 449
 450         switch (ic->ic_which) {
 451         case IC_NAMEID:
 452                 /* Type */
 453                 p = im.im_type == IDMAP_TYPE_USER ? "user" : "group";
 454                 addfield(&bp, &bsiz, p);
 455                 /* Name */
 456                 addfield(&bp, &bsiz, im.im_name);
 457 #define NFSD_EXPIRY 300 /* seconds */
 458                 /* expiry */
 459                 snprintf(buf1, sizeof(buf1), "%lu", time(NULL) + NFSD_EXPIRY);
 460                 addfield(&bp, &bsiz, buf1);
 461                 /* ID */
 462                 snprintf(buf1, sizeof(buf1), "%u", im.im_id);
 463                 addfield(&bp, &bsiz, buf1);
 464
 465                 //if (bsiz == sizeof(buf)) /* XXX */
 466
 467                 bp[-1] = '\n';
 468
 469                 break;
 470         case IC_IDNAME:
 471                 /* Type */
 472                 p = im.im_type == IDMAP_TYPE_USER ? "user" : "group";
 473                 addfield(&bp, &bsiz, p);
 474                 /* ID */
 475                 snprintf(buf1, sizeof(buf1), "%u", im.im_id);
 476                 addfield(&bp, &bsiz, buf1);
 477                 /* expiry */
 478                 snprintf(buf1, sizeof(buf1), "%lu", time(NULL) + NFSD_EXPIRY);
 479                 addfield(&bp, &bsiz, buf1);
 480                 /* Name */
 481                 addfield(&bp, &bsiz, im.im_name);
 482
 483                 bp[-1] = '\n';
 484
 485                 break;
 486         default:
 487                 warnx("Unknown which type %d", ic->ic_which);
 488                 return;
 489         }
 490
 491         bsiz = sizeof(buf) - bsiz;
 492
 493         if (atomicio(write, ic->ic_fd, buf, bsiz) != bsiz)
 494                 warnx("nfsdcb: write(%s) failed: errno %d (%s)",
 495                         ic->ic_path, errno, strerror(errno));
 496
 497 out:
 498         event_add(&ic->ic_event, NULL);
 499 }
 500
 501 static void
 502 imconv(struct idmap_client *ic, struct idmap_msg *im)
 503 {
 504         switch (im->im_conv) {
 505         case IDMAP_CONV_IDTONAME:
 506                 idtonameres(im);
 507                 if (verbose > 1)
 508                         warnx("%s %s: (%s) id \"%d\" -> name \"%s\"",
 509                             ic->ic_id, ic->ic_clid,
 510                             im->im_type == IDMAP_TYPE_USER ? "user" : "group",
 511                             im->im_id, im->im_name);
 512                 break;
 513         case IDMAP_CONV_NAMETOID:
 514                 if (validateascii(im->im_name, sizeof(im->im_name)) == -1) {
 515                         im->im_status |= IDMAP_STATUS_INVALIDMSG;
 516                         return;
 517                 }
 518                 nametoidres(im);
 519                 if (verbose > 1)
 520                         warnx("%s %s: (%s) name \"%s\" -> id \"%d\"",
 521                             ic->ic_id, ic->ic_clid,
 522                             im->im_type == IDMAP_TYPE_USER ? "user" : "group",
 523                             im->im_name, im->im_id);
 524                 break;
 525         default:
 526                 warnx("Invalid conversion type (%d) in message", im->im_conv);
 527                 im->im_status |= IDMAP_STATUS_INVALIDMSG;
 528                 break;
 529         }
 530 }
 531
 532 static void
 533 nfscb(int fd, short which, void *data)
 534 {
 535         struct idmap_client *ic = data;
 536         struct idmap_msg im;
 537
 538         if (which != EV_READ)
 539                 goto out;
 540
 541         if (atomicio(read, ic->ic_fd, &im, sizeof(im)) != sizeof(im)) {
 542                 if (verbose > 0)
 543                         warn("read(%s)", ic->ic_path);
 544                 if (errno == EPIPE)
 545                         return;
 546                 goto out;
 547         }
 548
 549         imconv(ic, &im);
 550
 551         if (atomicio(write, ic->ic_fd, &im, sizeof(im)) != sizeof(im))
 552                 warn("write(%s)", ic->ic_path);
 553 out:
 554         event_add(&ic->ic_event, NULL);
 555 }
 556
 557 static void
 558 nfsdreopen_one(struct idmap_client *ic)
 559 {
 560         int fd;
 561
 562         if (verbose > 0)
 563                 warnx("ReOpening %s", ic->ic_path);
 564         if ((fd = open(ic->ic_path, O_RDWR, 0)) != -1) {
 565                 if (ic->ic_fd != -1)
 566                         close(ic->ic_fd);
 567                 ic->ic_event.ev_fd = ic->ic_fd = fd;
 568                 if ((ic->ic_event.ev_flags & EVLIST_INIT) == 0) {
 569                         event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfsdcb, ic);
 570                         event_add(&ic->ic_event, NULL);
 571                 }
 572         } else {
 573                 warnx("nfsdreopen: Opening '%s' failed: errno %d (%s)",
 574                         ic->ic_path, errno, strerror(errno));
 575         }
 576 }
 577
 578 /*
 579  * Note: nfsdreopen assumes nfsdopen has already been called
 580  */
 581 static void
 582 nfsdreopen()
 583 {
 584         nfsdreopen_one(&nfsd_ic[IC_NAMEID]);
 585         nfsdreopen_one(&nfsd_ic[IC_IDNAME]);
 586         return;
 587 }
 588
 589 static int
 590 nfsdopen(char *path)
 591 {
 592         return ((nfsdopenone(&nfsd_ic[0], IC_NAMEID, path) == 0 &&
 593                     nfsdopenone(&nfsd_ic[1], IC_IDNAME, path) == 0) ? 0 : -1);
 594 }
 595
 596 static int
 597 nfsdopenone(struct idmap_client *ic, short which, char *path)
 598 {
 599         char *whichstr;
 600
 601         whichstr = which == IC_IDNAME ? "idtoname" : "nametoid";
 602         snprintf(ic->ic_path, sizeof(ic->ic_path),
 603                 "%s/nfs4.%s/channel", path, whichstr);
 604         if ((ic->ic_fd = open(ic->ic_path, O_RDWR, 0)) == -1) {
 605                 if (verbose > 0)
 606                         warnx("Opening %s failed: errno %d (%s)",
 607                                 ic->ic_path, errno, strerror(errno));
 608                 return (-1);
 609         }
 610
 611         event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfsdcb, ic);
 612         event_add(&ic->ic_event, NULL);
 613
 614         ic->ic_which = which;
 615         ic->ic_id = "Server";
 616         strlcpy(ic->ic_clid, "Server", strlen("Server"));
 617
 618         if (verbose > 0)
 619                 warnx("Opened %s", ic->ic_path);
 620
 621         return (0);
 622 }
 623
 624 static int
 625 nfsopen(struct idmap_client *ic)
 626 {
 627         if ((ic->ic_fd = open(ic->ic_path, O_RDWR, 0)) == -1) {
 628                 switch (errno) {
 629                 case ENOENT:
 630                         fcntl(ic->ic_dirfd, F_SETSIG, SIGUSR2);
 631                         fcntl(ic->ic_dirfd, F_NOTIFY,
 632                             DN_CREATE | DN_DELETE | DN_MULTISHOT);
 633                         break;
 634                 default:
 635                         warn("open(%s)", ic->ic_path);
 636                         return (-1);
 637                 }
 638         } else {
 639                 event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfscb, ic);
 640                 event_add(&ic->ic_event, NULL);
 641                 fcntl(ic->ic_dirfd, F_SETSIG, 0);
 642                 fcntl(ic->ic_dirfd, F_NOTIFY, 0);
 643                 if (verbose > 0)
 644                         warnx("Opened %s", ic->ic_path);
 645         }
 646
 647         return (0);
 648 }
 649
 650 static int write_name(char *dest, char *localname, char *domain, size_t len)
 651 {
 652         if (strlen(localname) + 1 + strlen(domain) + 1 > len) {
 653                 return -ENOMEM; /* XXX: Is there an -ETOOLONG? */
 654         }
 655         strcpy(dest, localname);
 656         strcat(dest, "@");
 657         strcat(dest, domain);
 658         return 0;
 659 }
 660
 661 static void
 662 idtonameres(struct idmap_msg *im)
 663 {
 664         char domain[NFS4_MAX_DOMAIN_LEN];
 665         int ret = 0;
 666
 667         ret = nfs4_get_default_domain(NULL, domain, sizeof(domain));
 668         switch (im->im_type) {
 669         case IDMAP_TYPE_USER:
 670                 ret = nfs4_uid_to_name(im->im_id, domain, im->im_name,
 671                                 sizeof(im->im_name));
 672                 if (ret)
 673                         write_name(im->im_name, nobodyuser, domain,
 674                                         sizeof(im->im_name));
 675                 break;
 676         case IDMAP_TYPE_GROUP:
 677                 ret = nfs4_gid_to_name(im->im_id, domain, im->im_name,
 678                                 sizeof(im->im_name));
 679                 if (ret)
 680                         write_name(im->im_name, nobodygroup, domain,
 681                                         sizeof(im->im_name));
 682                 break;
 683         }
 684         /* XXX Hack? would rather return failure instead of writing nobody
 685          * as above, but kernel seems not to deal well with that as of
 686          * 2.6.8-rc3. */
 687         im->im_status = IDMAP_STATUS_SUCCESS;
 688 }
 689
 690 static void
 691 nametoidres(struct idmap_msg *im)
 692 {
 693         int ret = 0;
 694
 695         switch (im->im_type) {
 696         case IDMAP_TYPE_USER:
 697                 ret = nfs4_name_to_uid(im->im_name, &im->im_id);
 698                 if (ret)
 699                         im->im_id = nobodyuid;
 700                 break;
 701         case IDMAP_TYPE_GROUP:
 702                 ret = nfs4_name_to_gid(im->im_name, &im->im_id);
 703                 if (ret)
 704                         im->im_id = nobodygid;
 705                 break;
 706         }
 707         /* XXX Hack? would rather return failure instead of writing nobody
 708          * as above, but kernel seems not to deal well with that as of
 709          * 2.6.8-rc3. */
 710         im->im_status = IDMAP_STATUS_SUCCESS;
 711 }
 712
 713 static int
 714 validateascii(char *string, u_int32_t len)
 715 {
 716         int i;
 717
 718         for (i = 0; i < len; i++) {
 719                 if (string[i] == '\0')
 720                         break;
 721
 722                 if (string[i] & 0x80)
 723                         return (-1);
 724         }
 725
 726         if (string[i] != '\0')
 727                 return (-1);
 728
 729         return (i + 1);
 730 }
 731
 732 static int
 733 addfield(char **bpp, ssize_t *bsizp, char *fld)
 734 {
 735         char ch, *bp = *bpp;
 736         ssize_t bsiz = *bsizp;
 737
 738         while ((ch = *fld++) != '\0' && bsiz > 0) {
 739                 switch(ch) {
 740                 case ' ':
 741                 case '\t':
 742                 case '\n':
 743                 case '\\':
 744                         if (bsiz >= 4) {
 745                                 bp += snprintf(bp, bsiz, "\\%03o", ch);
 746                                 bsiz -= 4;
 747                         }
 748                         break;
 749                 default:
 750                         *bp++ = ch;
 751                         bsiz--;
 752                         break;
 753                 }
 754         }
 755
 756         if (bsiz < 1 || ch != '\0')
 757                 return (-1);
 758
 759         *bp++ = ' ';
 760         bsiz--;
 761
 762         *bpp = bp;
 763         *bsizp = bsiz;
 764
 765         return (0);
 766 }
 767
 768 static int
 769 getfield(char **bpp, char *fld, size_t fldsz)
 770 {
 771         char *bp;
 772         u_int val, n;
 773
 774         while ((bp = strsep(bpp, " ")) != NULL && bp[0] == '\0')
 775                 ;
 776
 777         if (bp == NULL || bp[0] == '\0' || bp[0] == '\n')
 778                 return (-1);
 779
 780         while (*bp != '\0' && fldsz > 1) {
 781                 if (*bp == '\\') {
 782                         if ((n = sscanf(bp, "\\%03o", &val)) != 1)
 783                                 return (-1);
 784                         if (val > (char)-1)
 785                                 return (-1);
 786                         *fld++ = (char)val;
 787                         bp += 4;
 788                 } else {
 789                         *fld++ = *bp;
 790                         bp++;
 791                 }
 792                 fldsz--;
 793         }
 794
 795         if (*bp != '\0')
 796                 return (-1);
 797         *fld = '\0';
 798
 799         return (0);
 800 }
 801 /*
 802  * mydaemon creates a pipe between the partent and child
 803  * process. The parent process will wait until the
 804  * child dies or writes a '1' on the pipe signaling
 805  * that it started successfully.
 806  */
 807 int pipefds[2] = { -1, -1};
 808
 809 void
 810 mydaemon(int nochdir, int noclose)
 811 {
 812         int pid, status, tempfd, fdmax, filedes;
 813
 814         if (pipe(pipefds) < 0)
 815                 err(1, "mydaemon: pipe() failed: errno %d (%s)\n", errno, strerror(errno));
 816
 817         if ((pid = fork ()) < 0)
 818                 err(1, "mydaemon: fork() failed: errno %d (%s)\n", errno, strerror(errno));
 819
 820         if (pid != 0) {
 821                 /*
 822                  * Parent. Wait for status from child.
 823                  */
 824                 close(pipefds[1]);
 825                 if (read(pipefds[0], &status, 1) != 1)
 826                         exit(1);
 827                 exit (0);
 828         }
 829         /* Child.       */
 830         close(pipefds[0]);
 831         setsid ();
 832         if (nochdir == 0) {
 833                 if (chdir ("/") == -1)
 834                         err(1, "mydaemon: chdir() failed: errno %d (%s)\n", errno, strerror(errno));
 835         }
 836
 837         while (pipefds[1] <= 2) {
 838                 pipefds[1] = dup(pipefds[1]);
 839                 if (pipefds[1] < 0)
 840                         err(1, "mydaemon: dup() failed: errno %d (%s)\n", errno, strerror(errno));
 841         }
 842
 843         if (noclose == 0) {
 844                 tempfd = open("/dev/null", O_RDWR);
 845                 close(0); dup2(tempfd, 0);
 846                 close(1); dup2(tempfd, 1);
 847                 close(2); dup2(tempfd, 2);
 848                 fdmax = sysconf (_SC_OPEN_MAX);
 849                 for (filedes = 3; filedes < fdmax; filedes++)
 850                         if (filedes != pipefds[1])
 851                                 close (filedes);
 852         }
 853
 854         return;
 855 }
 856 void
 857 release_parent()
 858 {
 859         int status;
 860
 861         if (pipefds[1] > 0) {
 862                 write(pipefds[1], &status, 1);
 863                 close(pipefds[1]);
 864                 pipefds[1] = -1;
 865         }
 866 }