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 "conffile.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 {
 121         .ic_which = IC_IDNAME,
 122         .ic_clid = "",
 123         .ic_id = "Server",
 124         .ic_path = IC_IDNAME_CHAN,
 125         .ic_fd = -1,
 126         .ic_dirfd = -1,
 127         .ic_scanned = 0
 128 },
 129 {
 130         .ic_which = IC_NAMEID,
 131         .ic_clid = "",
 132         .ic_id = "Server",
 133         .ic_path = IC_NAMEID_CHAN,
 134         .ic_fd = -1,
 135         .ic_dirfd = -1,
 136         .ic_scanned = 0
 137 },
 138 };
 139
 140 TAILQ_HEAD(idmap_clientq, idmap_client);
 141
 142 static void dirscancb(int, short, void *);
 143 static void clntscancb(int, short, void *);
 144 static void svrreopen(int, short, void *);
 145 static int  nfsopen(struct idmap_client *);
 146 static void nfscb(int, short, void *);
 147 static void nfsdcb(int, short, void *);
 148 static int  validateascii(char *, u_int32_t);
 149 static int  addfield(char **, ssize_t *, char *);
 150 static int  getfield(char **, char *, size_t);
 151
 152 static void imconv(struct idmap_client *, struct idmap_msg *);
 153 static void idtonameres(struct idmap_msg *);
 154 static void nametoidres(struct idmap_msg *);
 155
 156 static int nfsdopen(void);
 157 static int nfsdopenone(struct idmap_client *);
 158 static void nfsdreopen_one(struct idmap_client *);
 159 static void nfsdreopen(void);
 160
 161 void    mydaemon(int, int);
 162 void    release_parent(void);
 163
 164 static int verbose = 0;
 165 #define DEFAULT_IDMAP_CACHE_EXPIRY 600 /* seconds */
 166 static int cache_entry_expiration = 0;
 167 static char pipefsdir[PATH_MAX];
 168 static char *nobodyuser, *nobodygroup;
 169 static uid_t nobodyuid;
 170 static gid_t nobodygid;
 171
 172 /* Used by conffile.c in libnfs.a */
 173 char *conf_path;
 174
 175 static int
 176 flush_nfsd_cache(char *path, time_t now)
 177 {
 178         int fd;
 179         char stime[20];
 180
 181         sprintf(stime, "%ld\n", now);
 182         fd = open(path, O_RDWR);
 183         if (fd == -1)
 184                 return -1;
 185         if (write(fd, stime, strlen(stime)) != (ssize_t)strlen(stime)) {
 186                 errx(1, "Flushing nfsd cache failed: errno %d (%s)",
 187                         errno, strerror(errno));
 188         }
 189         close(fd);
 190         return 0;
 191 }
 192
 193 static int
 194 flush_nfsd_idmap_cache(void)
 195 {
 196         time_t now = time(NULL);
 197         int ret;
 198
 199         ret = flush_nfsd_cache(IC_IDNAME_FLUSH, now);
 200         if (ret)
 201                 return ret;
 202         ret = flush_nfsd_cache(IC_NAMEID_FLUSH, now);
 203         return ret;
 204 }
 205
 206 int
 207 main(int argc, char **argv)
 208 {
 209         int fd = 0, opt, fg = 0, nfsdret = -1;
 210         struct idmap_clientq icq;
 211         struct event rootdirev, clntdirev, svrdirev;
 212         struct event initialize;
 213         struct passwd *pw;
 214         struct group *gr;
 215         struct stat sb;
 216         char *xpipefsdir = NULL;
 217         int serverstart = 1, clientstart = 1;
 218         int ret;
 219         char *progname;
 220
 221         conf_path = _PATH_IDMAPDCONF;
 222         nobodyuser = NFS4NOBODY_USER;
 223         nobodygroup = NFS4NOBODY_GROUP;
 224         strlcpy(pipefsdir, PIPEFS_DIR, sizeof(pipefsdir));
 225
 226         if ((progname = strrchr(argv[0], '/')))
 227                 progname++;
 228         else
 229                 progname = argv[0];
 230         xlog_open(progname);
 231
 232 #define GETOPTSTR "vfd:p:U:G:c:CS"
 233         opterr=0; /* Turn off error messages */
 234         while ((opt = getopt(argc, argv, GETOPTSTR)) != -1) {
 235                 if (opt == 'c')
 236                         conf_path = optarg;
 237                 if (opt == '?') {
 238                         if (strchr(GETOPTSTR, optopt))
 239                                 errx(1, "'-%c' option requires an argument.", optopt);
 240                         else
 241                                 errx(1, "'-%c' is an invalid argument.", optopt);
 242                 }
 243         }
 244         optind = 1;
 245
 246         if (stat(conf_path, &sb) == -1 && (errno == ENOENT || errno == EACCES)) {
 247                 warn("Skipping configuration file \"%s\"", conf_path);
 248                 conf_path = NULL;
 249         } else {
 250                 conf_init();
 251                 verbose = conf_get_num("General", "Verbosity", 0);
 252                 cache_entry_expiration = conf_get_num("General",
 253                                 "Cache-Expiration", DEFAULT_IDMAP_CACHE_EXPIRY);
 254                 CONF_SAVE(xpipefsdir, conf_get_str("General", "Pipefs-Directory"));
 255                 if (xpipefsdir != NULL)
 256                         strlcpy(pipefsdir, xpipefsdir, sizeof(pipefsdir));
 257                 CONF_SAVE(nobodyuser, conf_get_str("Mapping", "Nobody-User"));
 258                 CONF_SAVE(nobodygroup, conf_get_str("Mapping", "Nobody-Group"));
 259         }
 260
 261         while ((opt = getopt(argc, argv, GETOPTSTR)) != -1)
 262                 switch (opt) {
 263                 case 'v':
 264                         verbose++;
 265                         break;
 266                 case 'f':
 267                         fg = 1;
 268                         break;
 269                 case 'p':
 270                         strlcpy(pipefsdir, optarg, sizeof(pipefsdir));
 271                         break;
 272                 case 'd':
 273                 case 'U':
 274                 case 'G':
 275                         errx(1, "the -d, -U, and -G options have been removed;"
 276                                 " please use the configuration file instead.");
 277                 case 'C':
 278                         serverstart = 0;
 279                         break;
 280                 case 'S':
 281                         clientstart = 0;
 282                         break;
 283                 default:
 284                         break;
 285                 }
 286
 287         if (!serverstart && !clientstart)
 288                 errx(1, "it is illegal to specify both -C and -S");
 289
 290         strncat(pipefsdir, "/nfs", sizeof(pipefsdir));
 291
 292         if ((pw = getpwnam(nobodyuser)) == NULL)
 293                 errx(1, "Could not find user \"%s\"", nobodyuser);
 294         nobodyuid = pw->pw_uid;
 295
 296         if ((gr = getgrnam(nobodygroup)) == NULL)
 297                 errx(1, "Could not find group \"%s\"", nobodygroup);
 298         nobodygid = gr->gr_gid;
 299
 300 #ifdef HAVE_NFS4_SET_DEBUG
 301         nfs4_set_debug(verbose, xlog_warn);
 302 #endif
 303         if (conf_path == NULL)
 304                 conf_path = _PATH_IDMAPDCONF;
 305         if (nfs4_init_name_mapping(conf_path))
 306                 errx(1, "Unable to create name to user id mappings.");
 307
 308         if (!fg)
 309                 mydaemon(0, 0);
 310
 311         event_init();
 312
 313         if (verbose > 0)
 314                 xlog_warn("Expiration time is %d seconds.",
 315                              cache_entry_expiration);
 316         if (serverstart) {
 317                 nfsdret = nfsdopen();
 318                 if (nfsdret == 0) {
 319                         ret = flush_nfsd_idmap_cache();
 320                         if (ret)
 321                                 xlog_err("main: Failed to flush nfsd idmap cache\n: %s", strerror(errno));
 322                 }
 323         }
 324
 325         if (clientstart) {
 326                 struct timeval now = {
 327                         .tv_sec = 0,
 328                         .tv_usec = 0,
 329                 };
 330
 331                 if (cache_entry_expiration != DEFAULT_IDMAP_CACHE_EXPIRY) {
 332                         int timeout_fd, len;
 333                         char timeout_buf[12];
 334                         if ((timeout_fd = open(CLIENT_CACHE_TIMEOUT_FILE,
 335                                                O_RDWR)) == -1) {
 336                                 xlog_warn("Unable to open '%s' to set "
 337                                              "client cache expiration time "
 338                                              "to %d seconds\n",
 339                                              CLIENT_CACHE_TIMEOUT_FILE,
 340                                              cache_entry_expiration);
 341                         } else {
 342                                 len = snprintf(timeout_buf, sizeof(timeout_buf),
 343                                                "%d", cache_entry_expiration);
 344                                 if ((write(timeout_fd, timeout_buf, len)) != len)
 345                                         xlog_warn("Error writing '%s' to "
 346                                                      "'%s' to set client "
 347                                                      "cache expiration time\n",
 348                                                      timeout_buf,
 349                                                      CLIENT_CACHE_TIMEOUT_FILE);
 350                                 close(timeout_fd);
 351                         }
 352                 }
 353
 354                 if ((fd = open(pipefsdir, O_RDONLY)) == -1)
 355                         xlog_err("main: open(%s): %s", pipefsdir, strerror(errno));
 356
 357                 if (fcntl(fd, F_SETSIG, SIGUSR1) == -1)
 358                         xlog_err("main: fcntl(%s): %s", pipefsdir, strerror(errno));
 359
 360                 if (fcntl(fd, F_NOTIFY,
 361                         DN_CREATE | DN_DELETE | DN_MODIFY | DN_MULTISHOT) == -1) {
 362                         xlog_err("main: fcntl(%s): %s", pipefsdir, strerror(errno));
 363                         if (errno == EINVAL)
 364                                 xlog_err("main: Possibly no Dnotify support in kernel.");
 365                 }
 366                 TAILQ_INIT(&icq);
 367
 368                 /* These events are persistent */
 369                 signal_set(&rootdirev, SIGUSR1, dirscancb, &icq);
 370                 signal_add(&rootdirev, NULL);
 371                 signal_set(&clntdirev, SIGUSR2, clntscancb, &icq);
 372                 signal_add(&clntdirev, NULL);
 373                 signal_set(&svrdirev, SIGHUP, svrreopen, NULL);
 374                 signal_add(&svrdirev, NULL);
 375
 376                 /* Fetch current state */
 377                 /* (Delay till start of event_dispatch to avoid possibly losing
 378                  * a SIGUSR1 between here and the call to event_dispatch().) */
 379                 evtimer_set(&initialize, dirscancb, &icq);
 380                 evtimer_add(&initialize, &now);
 381         }
 382
 383         if (nfsdret != 0 && fd == 0)
 384                 xlog_err("main: Neither NFS client nor NFSd found");
 385
 386         release_parent();
 387
 388         if (event_dispatch() < 0)
 389                 xlog_err("main: event_dispatch returns errno %d (%s)",
 390                             errno, strerror(errno));
 391         /* NOTREACHED */
 392         return 1;
 393 }
 394
 395 static void
 396 dirscancb(int UNUSED(fd), short UNUSED(which), void *data)
 397 {
 398         int nent, i;
 399         struct dirent **ents;
 400         struct idmap_client *ic, *nextic;
 401         char path[PATH_MAX];
 402         struct idmap_clientq *icq = data;
 403
 404         nent = scandir(pipefsdir, &ents, NULL, alphasort);
 405         if (nent == -1) {
 406                 xlog_warn("dirscancb: scandir(%s): %s", pipefsdir, strerror(errno));
 407                 return;
 408         }
 409
 410         for (i = 0;  i < nent; i++) {
 411                 if (ents[i]->d_reclen > 4 &&
 412                     strncmp(ents[i]->d_name, "clnt", 4) == 0) {
 413                         TAILQ_FOREACH(ic, icq, ic_next)
 414                             if (strcmp(ents[i]->d_name + 4, ic->ic_clid) == 0)
 415                                     break;
 416                         if (ic != NULL)
 417                                 goto next;
 418
 419                         if ((ic = calloc(1, sizeof(*ic))) == NULL)
 420                                 goto out;
 421                         strlcpy(ic->ic_clid, ents[i]->d_name + 4,
 422                             sizeof(ic->ic_clid));
 423                         path[0] = '\0';
 424                         snprintf(path, sizeof(path), "%s/%s",
 425                             pipefsdir, ents[i]->d_name);
 426
 427                         if ((ic->ic_dirfd = open(path, O_RDONLY, 0)) == -1) {
 428                                 xlog_warn("dirscancb: open(%s): %s", path, strerror(errno));
 429                                 free(ic);
 430                                 goto out;
 431                         }
 432
 433                         strlcat(path, "/idmap", sizeof(path));
 434                         strlcpy(ic->ic_path, path, sizeof(ic->ic_path));
 435
 436                         if (verbose > 0)
 437                                 xlog_warn("New client: %s", ic->ic_clid);
 438
 439                         if (nfsopen(ic) == -1) {
 440                                 close(ic->ic_dirfd);
 441                                 free(ic);
 442                                 goto out;
 443                         }
 444
 445                         ic->ic_id = "Client";
 446
 447                         TAILQ_INSERT_TAIL(icq, ic, ic_next);
 448
 449                 next:
 450                         ic->ic_scanned = 1;
 451                 }
 452         }
 453
 454         ic = TAILQ_FIRST(icq);
 455         while(ic != NULL) {
 456                 nextic=TAILQ_NEXT(ic, ic_next);
 457                 if (!ic->ic_scanned) {
 458                         event_del(&ic->ic_event);
 459                         close(ic->ic_fd);
 460                         close(ic->ic_dirfd);
 461                         TAILQ_REMOVE(icq, ic, ic_next);
 462                         if (verbose > 0) {
 463                                 xlog_warn("Stale client: %s", ic->ic_clid);
 464                                 xlog_warn("\t-> closed %s", ic->ic_path);
 465                         }
 466                         free(ic);
 467                 } else
 468                         ic->ic_scanned = 0;
 469                 ic = nextic;
 470         }
 471
 472 out:
 473         for (i = 0;  i < nent; i++)
 474                 free(ents[i]);
 475         free(ents);
 476         return;
 477 }
 478
 479 static void
 480 svrreopen(int UNUSED(fd), short UNUSED(which), void *UNUSED(data))
 481 {
 482         nfsdreopen();
 483 }
 484
 485 static void
 486 clntscancb(int UNUSED(fd), short UNUSED(which), void *data)
 487 {
 488         struct idmap_clientq *icq = data;
 489         struct idmap_client *ic;
 490
 491         TAILQ_FOREACH(ic, icq, ic_next)
 492                 if (ic->ic_fd == -1 && nfsopen(ic) == -1) {
 493                         close(ic->ic_dirfd);
 494                         TAILQ_REMOVE(icq, ic, ic_next);
 495                         free(ic);
 496                 }
 497 }
 498
 499 static void
 500 nfsdcb(int UNUSED(fd), short which, void *data)
 501 {
 502         struct idmap_client *ic = data;
 503         struct idmap_msg im;
 504         u_char buf[IDMAP_MAXMSGSZ + 1];
 505         size_t len;
 506         ssize_t bsiz;
 507         char *bp, typebuf[IDMAP_MAXMSGSZ],
 508                 buf1[IDMAP_MAXMSGSZ], authbuf[IDMAP_MAXMSGSZ], *p;
 509         unsigned long tmp;
 510
 511         if (which != EV_READ)
 512                 goto out;
 513
 514         if ((len = read(ic->ic_fd, buf, sizeof(buf))) <= 0) {
 515                 xlog_warn("nfsdcb: read(%s) failed: errno %d (%s)",
 516                              ic->ic_path, len?errno:0,
 517                              len?strerror(errno):"End of File");
 518                 nfsdreopen_one(ic);
 519                 return;
 520         }
 521
 522         /* Get rid of newline and terminate buffer*/
 523         buf[len - 1] = '\0';
 524         bp = (char *)buf;
 525
 526         memset(&im, 0, sizeof(im));
 527
 528         /* Authentication name -- ignored for now*/
 529         if (getfield(&bp, authbuf, sizeof(authbuf)) == -1) {
 530                 xlog_warn("nfsdcb: bad authentication name in upcall\n");
 531                 goto out;
 532         }
 533         if (getfield(&bp, typebuf, sizeof(typebuf)) == -1) {
 534                 xlog_warn("nfsdcb: bad type in upcall\n");
 535                 goto out;
 536         }
 537         if (verbose > 0)
 538                 xlog_warn("nfsdcb: authbuf=%s authtype=%s",
 539                              authbuf, typebuf);
 540
 541         im.im_type = strcmp(typebuf, "user") == 0 ?
 542                 IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
 543
 544         switch (ic->ic_which) {
 545         case IC_NAMEID:
 546                 im.im_conv = IDMAP_CONV_NAMETOID;
 547                 if (getfield(&bp, im.im_name, sizeof(im.im_name)) == -1) {
 548                         xlog_warn("nfsdcb: bad name in upcall\n");
 549                         goto out;
 550                 }
 551                 break;
 552         case IC_IDNAME:
 553                 im.im_conv = IDMAP_CONV_IDTONAME;
 554                 if (getfield(&bp, buf1, sizeof(buf1)) == -1) {
 555                         xlog_warn("nfsdcb: bad id in upcall\n");
 556                         goto out;
 557                 }
 558                 tmp = strtoul(buf1, (char **)NULL, 10);
 559                 im.im_id = (u_int32_t)tmp;
 560                 if ((tmp == ULONG_MAX && errno == ERANGE)
 561                                 || (unsigned long)im.im_id != tmp) {
 562                         xlog_warn("nfsdcb: id '%s' too big!\n", buf1);
 563                         goto out;
 564                 }
 565                 break;
 566         default:
 567                 xlog_warn("nfsdcb: Unknown which type %d", ic->ic_which);
 568                 goto out;
 569         }
 570
 571         imconv(ic, &im);
 572
 573         buf[0] = '\0';
 574         bp = (char *)buf;
 575         bsiz = sizeof(buf);
 576
 577         /* Authentication name */
 578         addfield(&bp, &bsiz, authbuf);
 579
 580         switch (ic->ic_which) {
 581         case IC_NAMEID:
 582                 /* Type */
 583                 p = im.im_type == IDMAP_TYPE_USER ? "user" : "group";
 584                 addfield(&bp, &bsiz, p);
 585                 /* Name */
 586                 addfield(&bp, &bsiz, im.im_name);
 587                 /* expiry */
 588                 snprintf(buf1, sizeof(buf1), "%lu",
 589                          time(NULL) + cache_entry_expiration);
 590                 addfield(&bp, &bsiz, buf1);
 591                 /* Note that we don't want to write the id if the mapping
 592                  * failed; instead, by leaving it off, we write a negative
 593                  * cache entry which will result in an error returned to
 594                  * the client.  We don't want a chown or setacl referring
 595                  * to an unknown user to result in giving permissions to
 596                  * "nobody"! */
 597                 if (im.im_status == IDMAP_STATUS_SUCCESS) {
 598                         /* ID */
 599                         snprintf(buf1, sizeof(buf1), "%u", im.im_id);
 600                         addfield(&bp, &bsiz, buf1);
 601
 602                 }
 603                 //if (bsiz == sizeof(buf)) /* XXX */
 604
 605                 bp[-1] = '\n';
 606
 607                 break;
 608         case IC_IDNAME:
 609                 /* Type */
 610                 p = im.im_type == IDMAP_TYPE_USER ? "user" : "group";
 611                 addfield(&bp, &bsiz, p);
 612                 /* ID */
 613                 snprintf(buf1, sizeof(buf1), "%u", im.im_id);
 614                 addfield(&bp, &bsiz, buf1);
 615                 /* expiry */
 616                 snprintf(buf1, sizeof(buf1), "%lu",
 617                          time(NULL) + cache_entry_expiration);
 618                 addfield(&bp, &bsiz, buf1);
 619                 /* Note we're ignoring the status field in this case; we'll
 620                  * just map to nobody instead. */
 621                 /* Name */
 622                 addfield(&bp, &bsiz, im.im_name);
 623
 624                 bp[-1] = '\n';
 625
 626                 break;
 627         default:
 628                 xlog_warn("nfsdcb: Unknown which type %d", ic->ic_which);
 629                 goto out;
 630         }
 631
 632         bsiz = sizeof(buf) - bsiz;
 633
 634         if (atomicio((void*)write, ic->ic_fd, buf, bsiz) != bsiz)
 635                 xlog_warn("nfsdcb: write(%s) failed: errno %d (%s)",
 636                              ic->ic_path, errno, strerror(errno));
 637
 638 out:
 639         event_add(&ic->ic_event, NULL);
 640 }
 641
 642 static void
 643 imconv(struct idmap_client *ic, struct idmap_msg *im)
 644 {
 645         switch (im->im_conv) {
 646         case IDMAP_CONV_IDTONAME:
 647                 idtonameres(im);
 648                 if (verbose > 1)
 649                         xlog_warn("%s %s: (%s) id \"%d\" -> name \"%s\"",
 650                             ic->ic_id, ic->ic_clid,
 651                             im->im_type == IDMAP_TYPE_USER ? "user" : "group",
 652                             im->im_id, im->im_name);
 653                 break;
 654         case IDMAP_CONV_NAMETOID:
 655                 if (validateascii(im->im_name, sizeof(im->im_name)) == -1) {
 656                         im->im_status |= IDMAP_STATUS_INVALIDMSG;
 657                         return;
 658                 }
 659                 nametoidres(im);
 660                 if (verbose > 1)
 661                         xlog_warn("%s %s: (%s) name \"%s\" -> id \"%d\"",
 662                             ic->ic_id, ic->ic_clid,
 663                             im->im_type == IDMAP_TYPE_USER ? "user" : "group",
 664                             im->im_name, im->im_id);
 665                 break;
 666         default:
 667                 xlog_warn("imconv: Invalid conversion type (%d) in message",
 668                              im->im_conv);
 669                 im->im_status |= IDMAP_STATUS_INVALIDMSG;
 670                 break;
 671         }
 672 }
 673
 674 static void
 675 nfscb(int UNUSED(fd), short which, void *data)
 676 {
 677         struct idmap_client *ic = data;
 678         struct idmap_msg im;
 679
 680         if (which != EV_READ)
 681                 goto out;
 682
 683         if (atomicio(read, ic->ic_fd, &im, sizeof(im)) != sizeof(im)) {
 684                 if (verbose > 0)
 685                         xlog_warn("nfscb: read(%s): %s", ic->ic_path, strerror(errno));
 686                 if (errno == EPIPE)
 687                         return;
 688                 goto out;
 689         }
 690
 691         imconv(ic, &im);
 692
 693         /* XXX: I don't like ignoring this error in the id->name case,
 694          * but we've never returned it, and I need to check that the client
 695          * can handle it gracefully before starting to return it now. */
 696
 697         if (im.im_status == IDMAP_STATUS_LOOKUPFAIL)
 698                 im.im_status = IDMAP_STATUS_SUCCESS;
 699
 700         if (atomicio((void*)write, ic->ic_fd, &im, sizeof(im)) != sizeof(im))
 701                 xlog_warn("nfscb: write(%s): %s", ic->ic_path, strerror(errno));
 702 out:
 703         event_add(&ic->ic_event, NULL);
 704 }
 705
 706 static void
 707 nfsdreopen_one(struct idmap_client *ic)
 708 {
 709         int fd;
 710
 711         if (verbose > 0)
 712                 xlog_warn("ReOpening %s", ic->ic_path);
 713
 714         if ((fd = open(ic->ic_path, O_RDWR, 0)) != -1) {
 715                 if ((ic->ic_event.ev_flags & EVLIST_INIT))
 716                         event_del(&ic->ic_event);
 717                 if (ic->ic_fd != -1)
 718                         close(ic->ic_fd);
 719
 720                 ic->ic_event.ev_fd = ic->ic_fd = fd;
 721                 event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfsdcb, ic);
 722                 event_add(&ic->ic_event, NULL);
 723         } else {
 724                 xlog_warn("nfsdreopen: Opening '%s' failed: errno %d (%s)",
 725                         ic->ic_path, errno, strerror(errno));
 726         }
 727 }
 728
 729 static void
 730 nfsdreopen()
 731 {
 732         nfsdreopen_one(&nfsd_ic[IC_NAMEID]);
 733         nfsdreopen_one(&nfsd_ic[IC_IDNAME]);
 734         return;
 735 }
 736
 737 static int
 738 nfsdopen(void)
 739 {
 740         return ((nfsdopenone(&nfsd_ic[IC_NAMEID]) == 0 &&
 741                     nfsdopenone(&nfsd_ic[IC_IDNAME]) == 0) ? 0 : -1);
 742 }
 743
 744 static int
 745 nfsdopenone(struct idmap_client *ic)
 746 {
 747         if ((ic->ic_fd = open(ic->ic_path, O_RDWR, 0)) == -1) {
 748                 if (verbose > 0)
 749                         xlog_warn("nfsdopenone: Opening %s failed: "
 750                                 "errno %d (%s)",
 751                                 ic->ic_path, errno, strerror(errno));
 752                 return (-1);
 753         }
 754
 755         event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfsdcb, ic);
 756         event_add(&ic->ic_event, NULL);
 757
 758         if (verbose > 0)
 759                 xlog_warn("Opened %s", ic->ic_path);
 760
 761         return (0);
 762 }
 763
 764 static int
 765 nfsopen(struct idmap_client *ic)
 766 {
 767         if ((ic->ic_fd = open(ic->ic_path, O_RDWR, 0)) == -1) {
 768                 switch (errno) {
 769                 case ENOENT:
 770                         fcntl(ic->ic_dirfd, F_SETSIG, SIGUSR2);
 771                         fcntl(ic->ic_dirfd, F_NOTIFY,
 772                             DN_CREATE | DN_DELETE | DN_MULTISHOT);
 773                         break;
 774                 default:
 775                         xlog_warn("nfsopen: open(%s): %s", ic->ic_path, strerror(errno));
 776                         return (-1);
 777                 }
 778         } else {
 779                 event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfscb, ic);
 780                 event_add(&ic->ic_event, NULL);
 781                 fcntl(ic->ic_dirfd, F_NOTIFY, 0);
 782                 fcntl(ic->ic_dirfd, F_SETSIG, 0);
 783                 if (verbose > 0)
 784                         xlog_warn("Opened %s", ic->ic_path);
 785         }
 786
 787         return (0);
 788 }
 789
 790 static void
 791 idtonameres(struct idmap_msg *im)
 792 {
 793         char domain[NFS4_MAX_DOMAIN_LEN];
 794         int ret = 0;
 795
 796         ret = nfs4_get_default_domain(NULL, domain, sizeof(domain));
 797         switch (im->im_type) {
 798         case IDMAP_TYPE_USER:
 799                 ret = nfs4_uid_to_name(im->im_id, domain, im->im_name,
 800                                 sizeof(im->im_name));
 801                 if (ret) {
 802                         if (strlen(nobodyuser) < sizeof(im->im_name))
 803                                 strcpy(im->im_name, nobodyuser);
 804                         else
 805                                 strcpy(im->im_name, NFS4NOBODY_USER);
 806                 }
 807                 break;
 808         case IDMAP_TYPE_GROUP:
 809                 ret = nfs4_gid_to_name(im->im_id, domain, im->im_name,
 810                                 sizeof(im->im_name));
 811                 if (ret) {
 812                         if (strlen(nobodygroup) < sizeof(im->im_name))
 813                                 strcpy(im->im_name, nobodygroup);
 814                         else
 815                                 strcpy(im->im_name, NFS4NOBODY_GROUP);
 816                 }
 817                 break;
 818         }
 819         if (ret)
 820                 im->im_status = IDMAP_STATUS_LOOKUPFAIL;
 821         else
 822                 im->im_status = IDMAP_STATUS_SUCCESS;
 823 }
 824
 825 static void
 826 nametoidres(struct idmap_msg *im)
 827 {
 828         uid_t uid;
 829         gid_t gid;
 830         int ret = 0;
 831
 832         /* XXX: move nobody stuff to library calls
 833          * (nfs4_get_nobody_user(domain), nfs4_get_nobody_group(domain)) */
 834
 835         im->im_status = IDMAP_STATUS_SUCCESS;
 836
 837         switch (im->im_type) {
 838         case IDMAP_TYPE_USER:
 839                 ret = nfs4_name_to_uid(im->im_name, &uid);
 840                 im->im_id = (u_int32_t) uid;
 841                 if (ret) {
 842                         im->im_status = IDMAP_STATUS_LOOKUPFAIL;
 843                         im->im_id = nobodyuid;
 844                 }
 845                 return;
 846         case IDMAP_TYPE_GROUP:
 847                 ret = nfs4_name_to_gid(im->im_name, &gid);
 848                 im->im_id = (u_int32_t) gid;
 849                 if (ret) {
 850                         im->im_status = IDMAP_STATUS_LOOKUPFAIL;
 851                         im->im_id = nobodygid;
 852                 }
 853                 return;
 854         }
 855 }
 856
 857 static int
 858 validateascii(char *string, u_int32_t len)
 859 {
 860         u_int32_t i;
 861
 862         for (i = 0; i < len; i++) {
 863                 if (string[i] == '\0')
 864                         break;
 865
 866                 if (string[i] & 0x80)
 867                         return (-1);
 868         }
 869
 870         if ((i >= len) || string[i] != '\0')
 871                 return (-1);
 872
 873         return (i + 1);
 874 }
 875
 876 static int
 877 addfield(char **bpp, ssize_t *bsizp, char *fld)
 878 {
 879         char ch, *bp = *bpp;
 880         ssize_t bsiz = *bsizp;
 881
 882         while ((ch = *fld++) != '\0' && bsiz > 0) {
 883                 switch(ch) {
 884                 case ' ':
 885                 case '\t':
 886                 case '\n':
 887                 case '\\':
 888                         if (bsiz >= 4) {
 889                                 bp += snprintf(bp, bsiz, "\\%03o", ch);
 890                                 bsiz -= 4;
 891                         }
 892                         break;
 893                 default:
 894                         *bp++ = ch;
 895                         bsiz--;
 896                         break;
 897                 }
 898         }
 899
 900         if (bsiz < 1 || ch != '\0')
 901                 return (-1);
 902
 903         *bp++ = ' ';
 904         bsiz--;
 905
 906         *bpp = bp;
 907         *bsizp = bsiz;
 908
 909         return (0);
 910 }
 911
 912 static int
 913 getfield(char **bpp, char *fld, size_t fldsz)
 914 {
 915         char *bp;
 916         int val, n;
 917
 918         while ((bp = strsep(bpp, " ")) != NULL && bp[0] == '\0')
 919                 ;
 920
 921         if (bp == NULL || bp[0] == '\0' || bp[0] == '\n')
 922                 return (-1);
 923
 924         while (*bp != '\0' && fldsz > 1) {
 925                 if (*bp == '\\') {
 926                         if ((n = sscanf(bp, "\\%03o", &val)) != 1)
 927                                 return (-1);
 928                         if (val > UCHAR_MAX)
 929                                 return (-1);
 930                         *fld++ = val;
 931                         bp += 4;
 932                 } else {
 933                         *fld++ = *bp;
 934                         bp++;
 935                 }
 936                 fldsz--;
 937         }
 938
 939         if (*bp != '\0')
 940                 return (-1);
 941         *fld = '\0';
 942
 943         return (0);
 944 }
 945 /*
 946  * mydaemon creates a pipe between the partent and child
 947  * process. The parent process will wait until the
 948  * child dies or writes a '1' on the pipe signaling
 949  * that it started successfully.
 950  */
 951 int pipefds[2] = { -1, -1};
 952
 953 void
 954 mydaemon(int nochdir, int noclose)
 955 {
 956         int pid, status, tempfd;
 957
 958         if (pipe(pipefds) < 0)
 959                 err(1, "mydaemon: pipe() failed: errno %d", errno);
 960
 961         if ((pid = fork ()) < 0)
 962                 err(1, "mydaemon: fork() failed: errno %d", errno);
 963
 964         if (pid != 0) {
 965                 /*
 966                  * Parent. Wait for status from child.
 967                  */
 968                 close(pipefds[1]);
 969                 if (read(pipefds[0], &status, 1) != 1)
 970                         exit(1);
 971                 exit (0);
 972         }
 973         /* Child.       */
 974         close(pipefds[0]);
 975         setsid ();
 976         if (nochdir == 0) {
 977                 if (chdir ("/") == -1)
 978                         err(1, "mydaemon: chdir() failed: errno %d", errno);
 979         }
 980
 981         while (pipefds[1] <= 2) {
 982                 pipefds[1] = dup(pipefds[1]);
 983                 if (pipefds[1] < 0)
 984                         err(1, "mydaemon: dup() failed: errno %d", errno);
 985         }
 986
 987         if (noclose == 0) {
 988                 tempfd = open("/dev/null", O_RDWR);
 989                 if (tempfd < 0)
 990                         tempfd = open("/", O_RDONLY);
 991                 if (tempfd >= 0) {
 992                         dup2(tempfd, 0);
 993                         dup2(tempfd, 1);
 994                         dup2(tempfd, 2);
 995                         close(tempfd);
 996                 } else {
 997                         err(1, "mydaemon: can't open /dev/null: errno %d",
 998                                errno);
 999                         exit(1);
1000                 }
1001         }
1002
1003         return;
1004 }
1005 void
1006 release_parent(void)
1007 {
1008         int status;
1009
1010         if (pipefds[1] > 0) {
1011                 if (write(pipefds[1], &status, 1) != 1) {
1012                         err(1, "Writing to parent pipe failed: errno %d (%s)\n",
1013                                 errno, strerror(errno));
1014                 }
1015                 close(pipefds[1]);
1016                 pipefds[1] = -1;
1017         }
1018 }