utils/idmapd/idmapd.c

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