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