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         if (write(fd, stime, strlen(stime)) != strlen(stime)) {
 173                 errx(1, "Flushing nfsd cache failed: errno %d (%s)",
 174                         errno, strerror(errno));
 175         }
 176         close(fd);
 177         return 0;
 178 }
 179
 180 static int
 181 flush_nfsd_idmap_cache(void)
 182 {
 183         time_t now = time(NULL);
 184         int ret;
 185
 186         ret = flush_nfsd_cache(IC_IDNAME_FLUSH, now);
 187         if (ret)
 188                 return ret;
 189         ret = flush_nfsd_cache(IC_NAMEID_FLUSH, now);
 190         return ret;
 191 }
 192
 193 int
 194 main(int argc, char **argv)
 195 {
 196         int fd = 0, opt, fg = 0, nfsdret = -1;
 197         struct idmap_clientq icq;
 198         struct event rootdirev, clntdirev, svrdirev;
 199         struct event initialize;
 200         struct passwd *pw;
 201         struct group *gr;
 202         struct stat sb;
 203         char *xpipefsdir = NULL;
 204         int serverstart = 1, clientstart = 1;
 205         int ret;
 206         char *progname;
 207
 208         conf_path = _PATH_IDMAPDCONF;
 209         nobodyuser = NFS4NOBODY_USER;
 210         nobodygroup = NFS4NOBODY_GROUP;
 211         strlcpy(pipefsdir, PIPEFS_DIR, sizeof(pipefsdir));
 212
 213         if ((progname = strrchr(argv[0], '/')))
 214                 progname++;
 215         else
 216                 progname = argv[0];
 217         xlog_open(progname);
 218
 219 #define GETOPTSTR "vfd:p:U:G:c:CS"
 220         opterr=0; /* Turn off error messages */
 221         while ((opt = getopt(argc, argv, GETOPTSTR)) != -1) {
 222                 if (opt == 'c')
 223                         conf_path = optarg;
 224                 if (opt == '?') {
 225                         if (strchr(GETOPTSTR, optopt))
 226                                 errx(1, "'-%c' option requires an argument.", optopt);
 227                         else
 228                                 errx(1, "'-%c' is an invalid argument.", optopt);
 229                 }
 230         }
 231         optind = 1;
 232
 233         if (stat(conf_path, &sb) == -1 && (errno == ENOENT || errno == EACCES)) {
 234                 warn("Skipping configuration file \"%s\"", conf_path);
 235                 conf_path = NULL;
 236         } else {
 237                 conf_init();
 238                 verbose = conf_get_num("General", "Verbosity", 0);
 239                 cache_entry_expiration = conf_get_num("General",
 240                                 "Cache-Expiration", DEFAULT_IDMAP_CACHE_EXPIRY);
 241                 CONF_SAVE(xpipefsdir, conf_get_str("General", "Pipefs-Directory"));
 242                 if (xpipefsdir != NULL)
 243                         strlcpy(pipefsdir, xpipefsdir, sizeof(pipefsdir));
 244                 CONF_SAVE(nobodyuser, conf_get_str("Mapping", "Nobody-User"));
 245                 CONF_SAVE(nobodygroup, conf_get_str("Mapping", "Nobody-Group"));
 246         }
 247
 248         while ((opt = getopt(argc, argv, GETOPTSTR)) != -1)
 249                 switch (opt) {
 250                 case 'v':
 251                         verbose++;
 252                         break;
 253                 case 'f':
 254                         fg = 1;
 255                         break;
 256                 case 'p':
 257                         strlcpy(pipefsdir, optarg, sizeof(pipefsdir));
 258                         break;
 259                 case 'd':
 260                 case 'U':
 261                 case 'G':
 262                         errx(1, "the -d, -U, and -G options have been removed;"
 263                                 " please use the configuration file instead.");
 264                 case 'C':
 265                         serverstart = 0;
 266                         break;
 267                 case 'S':
 268                         clientstart = 0;
 269                         break;
 270                 default:
 271                         break;
 272                 }
 273
 274         if (!serverstart && !clientstart)
 275                 errx(1, "it is illegal to specify both -C and -S");
 276
 277         strncat(pipefsdir, "/nfs", sizeof(pipefsdir));
 278
 279         if ((pw = getpwnam(nobodyuser)) == NULL)
 280                 errx(1, "Could not find user \"%s\"", nobodyuser);
 281         nobodyuid = pw->pw_uid;
 282
 283         if ((gr = getgrnam(nobodygroup)) == NULL)
 284                 errx(1, "Could not find group \"%s\"", nobodygroup);
 285         nobodygid = gr->gr_gid;
 286
 287 #ifdef HAVE_NFS4_SET_DEBUG
 288         nfs4_set_debug(verbose, xlog_warn);
 289 #endif
 290         if (conf_path == NULL)
 291                 conf_path = _PATH_IDMAPDCONF;
 292         if (nfs4_init_name_mapping(conf_path))
 293                 errx(1, "Unable to create name to user id mappings.");
 294
 295         if (!fg)
 296                 mydaemon(0, 0);
 297
 298         event_init();
 299
 300         if (verbose > 0)
 301                 xlog_warn("Expiration time is %d seconds.",
 302                              cache_entry_expiration);
 303         if (serverstart) {
 304                 nfsdret = nfsdopen();
 305                 if (nfsdret == 0) {
 306                         ret = flush_nfsd_idmap_cache();
 307                         if (ret)
 308                                 xlog_err("main: Failed to flush nfsd idmap cache\n: %s", strerror(errno));
 309                 }
 310         }
 311
 312         if (clientstart) {
 313                 struct timeval now = {
 314                         .tv_sec = 0,
 315                         .tv_usec = 0,
 316                 };
 317
 318                 if (cache_entry_expiration != DEFAULT_IDMAP_CACHE_EXPIRY) {
 319                         int timeout_fd, len;
 320                         char timeout_buf[12];
 321                         if ((timeout_fd = open(CLIENT_CACHE_TIMEOUT_FILE,
 322                                                O_RDWR)) == -1) {
 323                                 xlog_warn("Unable to open '%s' to set "
 324                                              "client cache expiration time "
 325                                              "to %d seconds\n",
 326                                              CLIENT_CACHE_TIMEOUT_FILE,
 327                                              cache_entry_expiration);
 328                         } else {
 329                                 len = snprintf(timeout_buf, sizeof(timeout_buf),
 330                                                "%d", cache_entry_expiration);
 331                                 if ((write(timeout_fd, timeout_buf, len)) != len)
 332                                         xlog_warn("Error writing '%s' to "
 333                                                      "'%s' to set client "
 334                                                      "cache expiration time\n",
 335                                                      timeout_buf,
 336                                                      CLIENT_CACHE_TIMEOUT_FILE);
 337                                 close(timeout_fd);
 338                         }
 339                 }
 340
 341                 if ((fd = open(pipefsdir, O_RDONLY)) == -1)
 342                         xlog_err("main: open(%s): %s", pipefsdir, strerror(errno));
 343
 344                 if (fcntl(fd, F_SETSIG, SIGUSR1) == -1)
 345                         xlog_err("main: fcntl(%s): %s", pipefsdir, strerror(errno));
 346
 347                 if (fcntl(fd, F_NOTIFY,
 348                         DN_CREATE | DN_DELETE | DN_MODIFY | DN_MULTISHOT) == -1) {
 349                         xlog_err("main: fcntl(%s): %s", pipefsdir, strerror(errno));
 350                         if (errno == EINVAL)
 351                                 xlog_err("main: Possibly no Dnotify support in kernel.");
 352                 }
 353                 TAILQ_INIT(&icq);
 354
 355                 /* These events are persistent */
 356                 signal_set(&rootdirev, SIGUSR1, dirscancb, &icq);
 357                 signal_add(&rootdirev, NULL);
 358                 signal_set(&clntdirev, SIGUSR2, clntscancb, &icq);
 359                 signal_add(&clntdirev, NULL);
 360                 signal_set(&svrdirev, SIGHUP, svrreopen, NULL);
 361                 signal_add(&svrdirev, NULL);
 362
 363                 /* Fetch current state */
 364                 /* (Delay till start of event_dispatch to avoid possibly losing
 365                  * a SIGUSR1 between here and the call to event_dispatch().) */
 366                 evtimer_set(&initialize, dirscancb, &icq);
 367                 evtimer_add(&initialize, &now);
 368         }
 369
 370         if (nfsdret != 0 && fd == 0)
 371                 xlog_err("main: Neither NFS client nor NFSd found");
 372
 373         release_parent();
 374
 375         if (event_dispatch() < 0)
 376                 xlog_err("main: event_dispatch returns errno %d (%s)",
 377                             errno, strerror(errno));
 378         /* NOTREACHED */
 379         return 1;
 380 }
 381
 382 static void
 383 dirscancb(int fd, short which, void *data)
 384 {
 385         int nent, i;
 386         struct dirent **ents;
 387         struct idmap_client *ic, *nextic;
 388         char path[PATH_MAX];
 389         struct idmap_clientq *icq = data;
 390
 391         nent = scandir(pipefsdir, &ents, NULL, alphasort);
 392         if (nent == -1) {
 393                 xlog_warn("dirscancb: scandir(%s): %s", pipefsdir, strerror(errno));
 394                 return;
 395         }
 396
 397         for (i = 0;  i < nent; i++) {
 398                 if (ents[i]->d_reclen > 4 &&
 399                     strncmp(ents[i]->d_name, "clnt", 4) == 0) {
 400                         TAILQ_FOREACH(ic, icq, ic_next)
 401                             if (strcmp(ents[i]->d_name + 4, ic->ic_clid) == 0)
 402                                     break;
 403                         if (ic != NULL)
 404                                 goto next;
 405
 406                         if ((ic = calloc(1, sizeof(*ic))) == NULL)
 407                                 goto out;
 408                         strlcpy(ic->ic_clid, ents[i]->d_name + 4,
 409                             sizeof(ic->ic_clid));
 410                         path[0] = '\0';
 411                         snprintf(path, sizeof(path), "%s/%s",
 412                             pipefsdir, ents[i]->d_name);
 413
 414                         if ((ic->ic_dirfd = open(path, O_RDONLY, 0)) == -1) {
 415                                 xlog_warn("dirscancb: open(%s): %s", path, strerror(errno));
 416                                 free(ic);
 417                                 goto out;
 418                         }
 419
 420                         strlcat(path, "/idmap", sizeof(path));
 421                         strlcpy(ic->ic_path, path, sizeof(ic->ic_path));
 422
 423                         if (verbose > 0)
 424                                 xlog_warn("New client: %s", ic->ic_clid);
 425
 426                         if (nfsopen(ic) == -1) {
 427                                 close(ic->ic_dirfd);
 428                                 free(ic);
 429                                 goto out;
 430                         }
 431
 432                         ic->ic_id = "Client";
 433
 434                         TAILQ_INSERT_TAIL(icq, ic, ic_next);
 435
 436                 next:
 437                         ic->ic_scanned = 1;
 438                 }
 439         }
 440
 441         ic = TAILQ_FIRST(icq);
 442         while(ic != NULL) {
 443                 nextic=TAILQ_NEXT(ic, ic_next);
 444                 if (!ic->ic_scanned) {
 445                         event_del(&ic->ic_event);
 446                         close(ic->ic_fd);
 447                         close(ic->ic_dirfd);
 448                         TAILQ_REMOVE(icq, ic, ic_next);
 449                         if (verbose > 0) {
 450                                 xlog_warn("Stale client: %s", ic->ic_clid);
 451                                 xlog_warn("\t-> closed %s", ic->ic_path);
 452                         }
 453                         free(ic);
 454                 } else
 455                         ic->ic_scanned = 0;
 456                 ic = nextic;
 457         }
 458
 459 out:
 460         for (i = 0;  i < nent; i++)
 461                 free(ents[i]);
 462         free(ents);
 463         return;
 464 }
 465
 466 static void
 467 svrreopen(int fd, short which, void *data)
 468 {
 469         nfsdreopen();
 470 }
 471
 472 static void
 473 clntscancb(int fd, short which, void *data)
 474 {
 475         struct idmap_clientq *icq = data;
 476         struct idmap_client *ic;
 477
 478         TAILQ_FOREACH(ic, icq, ic_next)
 479                 if (ic->ic_fd == -1 && nfsopen(ic) == -1) {
 480                         close(ic->ic_dirfd);
 481                         TAILQ_REMOVE(icq, ic, ic_next);
 482                         free(ic);
 483                 }
 484 }
 485
 486 static void
 487 nfsdcb(int fd, short which, void *data)
 488 {
 489         struct idmap_client *ic = data;
 490         struct idmap_msg im;
 491         u_char buf[IDMAP_MAXMSGSZ + 1];
 492         size_t len;
 493         ssize_t bsiz;
 494         char *bp, typebuf[IDMAP_MAXMSGSZ],
 495                 buf1[IDMAP_MAXMSGSZ], authbuf[IDMAP_MAXMSGSZ], *p;
 496         unsigned long tmp;
 497
 498         if (which != EV_READ)
 499                 goto out;
 500
 501         if ((len = read(ic->ic_fd, buf, sizeof(buf))) <= 0) {
 502                 xlog_warn("nfsdcb: read(%s) failed: errno %d (%s)",
 503                              ic->ic_path, len?errno:0,
 504                              len?strerror(errno):"End of File");
 505                 goto out;
 506         }
 507
 508         /* Get rid of newline and terminate buffer*/
 509         buf[len - 1] = '\0';
 510         bp = (char *)buf;
 511
 512         memset(&im, 0, sizeof(im));
 513
 514         /* Authentication name -- ignored for now*/
 515         if (getfield(&bp, authbuf, sizeof(authbuf)) == -1) {
 516                 xlog_warn("nfsdcb: bad authentication name in upcall\n");
 517                 return;
 518         }
 519         if (getfield(&bp, typebuf, sizeof(typebuf)) == -1) {
 520                 xlog_warn("nfsdcb: bad type in upcall\n");
 521                 return;
 522         }
 523         if (verbose > 0)
 524                 xlog_warn("nfsdcb: authbuf=%s authtype=%s",
 525                              authbuf, typebuf);
 526
 527         im.im_type = strcmp(typebuf, "user") == 0 ?
 528                 IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
 529
 530         switch (ic->ic_which) {
 531         case IC_NAMEID:
 532                 im.im_conv = IDMAP_CONV_NAMETOID;
 533                 if (getfield(&bp, im.im_name, sizeof(im.im_name)) == -1) {
 534                         xlog_warn("nfsdcb: bad name in upcall\n");
 535                         return;
 536                 }
 537                 break;
 538         case IC_IDNAME:
 539                 im.im_conv = IDMAP_CONV_IDTONAME;
 540                 if (getfield(&bp, buf1, sizeof(buf1)) == -1) {
 541                         xlog_warn("nfsdcb: bad id in upcall\n");
 542                         return;
 543                 }
 544                 tmp = strtoul(buf1, (char **)NULL, 10);
 545                 im.im_id = (u_int32_t)tmp;
 546                 if ((tmp == ULONG_MAX && errno == ERANGE)
 547                                 || (unsigned long)im.im_id != tmp) {
 548                         xlog_warn("nfsdcb: id '%s' too big!\n", buf1);
 549                         return;
 550                 }
 551                 break;
 552         default:
 553                 xlog_warn("nfsdcb: Unknown which type %d", ic->ic_which);
 554                 return;
 555         }
 556
 557         imconv(ic, &im);
 558
 559         buf[0] = '\0';
 560         bp = (char *)buf;
 561         bsiz = sizeof(buf);
 562
 563         /* Authentication name */
 564         addfield(&bp, &bsiz, authbuf);
 565
 566         switch (ic->ic_which) {
 567         case IC_NAMEID:
 568                 /* Type */
 569                 p = im.im_type == IDMAP_TYPE_USER ? "user" : "group";
 570                 addfield(&bp, &bsiz, p);
 571                 /* Name */
 572                 addfield(&bp, &bsiz, im.im_name);
 573                 /* expiry */
 574                 snprintf(buf1, sizeof(buf1), "%lu",
 575                          time(NULL) + cache_entry_expiration);
 576                 addfield(&bp, &bsiz, buf1);
 577                 /* Note that we don't want to write the id if the mapping
 578                  * failed; instead, by leaving it off, we write a negative
 579                  * cache entry which will result in an error returned to
 580                  * the client.  We don't want a chown or setacl referring
 581                  * to an unknown user to result in giving permissions to
 582                  * "nobody"! */
 583                 if (im.im_status == IDMAP_STATUS_SUCCESS) {
 584                         /* ID */
 585                         snprintf(buf1, sizeof(buf1), "%u", im.im_id);
 586                         addfield(&bp, &bsiz, buf1);
 587
 588                 }
 589                 //if (bsiz == sizeof(buf)) /* XXX */
 590
 591                 bp[-1] = '\n';
 592
 593                 break;
 594         case IC_IDNAME:
 595                 /* Type */
 596                 p = im.im_type == IDMAP_TYPE_USER ? "user" : "group";
 597                 addfield(&bp, &bsiz, p);
 598                 /* ID */
 599                 snprintf(buf1, sizeof(buf1), "%u", im.im_id);
 600                 addfield(&bp, &bsiz, buf1);
 601                 /* expiry */
 602                 snprintf(buf1, sizeof(buf1), "%lu",
 603                          time(NULL) + cache_entry_expiration);
 604                 addfield(&bp, &bsiz, buf1);
 605                 /* Note we're ignoring the status field in this case; we'll
 606                  * just map to nobody instead. */
 607                 /* Name */
 608                 addfield(&bp, &bsiz, im.im_name);
 609
 610                 bp[-1] = '\n';
 611
 612                 break;
 613         default:
 614                 xlog_warn("nfsdcb: Unknown which type %d", ic->ic_which);
 615                 return;
 616         }
 617
 618         bsiz = sizeof(buf) - bsiz;
 619
 620         if (atomicio((void*)write, ic->ic_fd, buf, bsiz) != bsiz)
 621                 xlog_warn("nfsdcb: write(%s) failed: errno %d (%s)",
 622                              ic->ic_path, errno, strerror(errno));
 623
 624 out:
 625         event_add(&ic->ic_event, NULL);
 626 }
 627
 628 static void
 629 imconv(struct idmap_client *ic, struct idmap_msg *im)
 630 {
 631         switch (im->im_conv) {
 632         case IDMAP_CONV_IDTONAME:
 633                 idtonameres(im);
 634                 if (verbose > 1)
 635                         xlog_warn("%s %s: (%s) id \"%d\" -> name \"%s\"",
 636                             ic->ic_id, ic->ic_clid,
 637                             im->im_type == IDMAP_TYPE_USER ? "user" : "group",
 638                             im->im_id, im->im_name);
 639                 break;
 640         case IDMAP_CONV_NAMETOID:
 641                 if (validateascii(im->im_name, sizeof(im->im_name)) == -1) {
 642                         im->im_status |= IDMAP_STATUS_INVALIDMSG;
 643                         return;
 644                 }
 645                 nametoidres(im);
 646                 if (verbose > 1)
 647                         xlog_warn("%s %s: (%s) name \"%s\" -> id \"%d\"",
 648                             ic->ic_id, ic->ic_clid,
 649                             im->im_type == IDMAP_TYPE_USER ? "user" : "group",
 650                             im->im_name, im->im_id);
 651                 break;
 652         default:
 653                 xlog_warn("imconv: Invalid conversion type (%d) in message",
 654                              im->im_conv);
 655                 im->im_status |= IDMAP_STATUS_INVALIDMSG;
 656                 break;
 657         }
 658 }
 659
 660 static void
 661 nfscb(int fd, short which, void *data)
 662 {
 663         struct idmap_client *ic = data;
 664         struct idmap_msg im;
 665
 666         if (which != EV_READ)
 667                 goto out;
 668
 669         if (atomicio(read, ic->ic_fd, &im, sizeof(im)) != sizeof(im)) {
 670                 if (verbose > 0)
 671                         xlog_warn("nfscb: read(%s): %s", ic->ic_path, strerror(errno));
 672                 if (errno == EPIPE)
 673                         return;
 674                 goto out;
 675         }
 676
 677         imconv(ic, &im);
 678
 679         /* XXX: I don't like ignoring this error in the id->name case,
 680          * but we've never returned it, and I need to check that the client
 681          * can handle it gracefully before starting to return it now. */
 682
 683         if (im.im_status == IDMAP_STATUS_LOOKUPFAIL)
 684                 im.im_status = IDMAP_STATUS_SUCCESS;
 685
 686         if (atomicio((void*)write, ic->ic_fd, &im, sizeof(im)) != sizeof(im))
 687                 xlog_warn("nfscb: write(%s): %s", ic->ic_path, strerror(errno));
 688 out:
 689         event_add(&ic->ic_event, NULL);
 690 }
 691
 692 static void
 693 nfsdreopen_one(struct idmap_client *ic)
 694 {
 695         int fd;
 696
 697         if (verbose > 0)
 698                 xlog_warn("ReOpening %s", ic->ic_path);
 699
 700         if ((fd = open(ic->ic_path, O_RDWR, 0)) != -1) {
 701                 if ((ic->ic_event.ev_flags & EVLIST_INIT))
 702                         event_del(&ic->ic_event);
 703                 if (ic->ic_fd != -1)
 704                         close(ic->ic_fd);
 705
 706                 ic->ic_event.ev_fd = ic->ic_fd = fd;
 707                 event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfsdcb, ic);
 708                 event_add(&ic->ic_event, NULL);
 709         } else {
 710                 xlog_warn("nfsdreopen: Opening '%s' failed: errno %d (%s)",
 711                         ic->ic_path, errno, strerror(errno));
 712         }
 713 }
 714
 715 static void
 716 nfsdreopen()
 717 {
 718         nfsdreopen_one(&nfsd_ic[IC_NAMEID]);
 719         nfsdreopen_one(&nfsd_ic[IC_IDNAME]);
 720         return;
 721 }
 722
 723 static int
 724 nfsdopen(void)
 725 {
 726         return ((nfsdopenone(&nfsd_ic[IC_NAMEID]) == 0 &&
 727                     nfsdopenone(&nfsd_ic[IC_IDNAME]) == 0) ? 0 : -1);
 728 }
 729
 730 static int
 731 nfsdopenone(struct idmap_client *ic)
 732 {
 733         if ((ic->ic_fd = open(ic->ic_path, O_RDWR, 0)) == -1) {
 734                 if (verbose > 0)
 735                         xlog_warn("nfsdopenone: Opening %s failed: "
 736                                 "errno %d (%s)",
 737                                 ic->ic_path, errno, strerror(errno));
 738                 return (-1);
 739         }
 740
 741         event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfsdcb, ic);
 742         event_add(&ic->ic_event, NULL);
 743
 744         if (verbose > 0)
 745                 xlog_warn("Opened %s", ic->ic_path);
 746
 747         return (0);
 748 }
 749
 750 static int
 751 nfsopen(struct idmap_client *ic)
 752 {
 753         if ((ic->ic_fd = open(ic->ic_path, O_RDWR, 0)) == -1) {
 754                 switch (errno) {
 755                 case ENOENT:
 756                         fcntl(ic->ic_dirfd, F_SETSIG, SIGUSR2);
 757                         fcntl(ic->ic_dirfd, F_NOTIFY,
 758                             DN_CREATE | DN_DELETE | DN_MULTISHOT);
 759                         break;
 760                 default:
 761                         xlog_warn("nfsopen: open(%s): %s", ic->ic_path, strerror(errno));
 762                         return (-1);
 763                 }
 764         } else {
 765                 event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfscb, ic);
 766                 event_add(&ic->ic_event, NULL);
 767                 fcntl(ic->ic_dirfd, F_SETSIG, 0);
 768                 fcntl(ic->ic_dirfd, F_NOTIFY, 0);
 769                 if (verbose > 0)
 770                         xlog_warn("Opened %s", ic->ic_path);
 771         }
 772
 773         return (0);
 774 }
 775
 776 static void
 777 idtonameres(struct idmap_msg *im)
 778 {
 779         char domain[NFS4_MAX_DOMAIN_LEN];
 780         int ret = 0;
 781
 782         ret = nfs4_get_default_domain(NULL, domain, sizeof(domain));
 783         switch (im->im_type) {
 784         case IDMAP_TYPE_USER:
 785                 ret = nfs4_uid_to_name(im->im_id, domain, im->im_name,
 786                                 sizeof(im->im_name));
 787                 if (ret) {
 788                         if (strlen(nobodyuser) < sizeof(im->im_name))
 789                                 strcpy(im->im_name, nobodyuser);
 790                         else
 791                                 strcpy(im->im_name, NFS4NOBODY_USER);
 792                 }
 793                 break;
 794         case IDMAP_TYPE_GROUP:
 795                 ret = nfs4_gid_to_name(im->im_id, domain, im->im_name,
 796                                 sizeof(im->im_name));
 797                 if (ret) {
 798                         if (strlen(nobodygroup) < sizeof(im->im_name))
 799                                 strcpy(im->im_name, nobodygroup);
 800                         else
 801                                 strcpy(im->im_name, NFS4NOBODY_GROUP);
 802                 }
 803                 break;
 804         }
 805         if (ret)
 806                 im->im_status = IDMAP_STATUS_LOOKUPFAIL;
 807         else
 808                 im->im_status = IDMAP_STATUS_SUCCESS;
 809 }
 810
 811 static void
 812 nametoidres(struct idmap_msg *im)
 813 {
 814         uid_t uid;
 815         gid_t gid;
 816         int ret = 0;
 817
 818         /* XXX: move nobody stuff to library calls
 819          * (nfs4_get_nobody_user(domain), nfs4_get_nobody_group(domain)) */
 820
 821         im->im_status = IDMAP_STATUS_SUCCESS;
 822
 823         switch (im->im_type) {
 824         case IDMAP_TYPE_USER:
 825                 ret = nfs4_name_to_uid(im->im_name, &uid);
 826                 im->im_id = (u_int32_t) uid;
 827                 if (ret) {
 828                         im->im_status = IDMAP_STATUS_LOOKUPFAIL;
 829                         im->im_id = nobodyuid;
 830                 }
 831                 return;
 832         case IDMAP_TYPE_GROUP:
 833                 ret = nfs4_name_to_gid(im->im_name, &gid);
 834                 im->im_id = (u_int32_t) gid;
 835                 if (ret) {
 836                         im->im_status = IDMAP_STATUS_LOOKUPFAIL;
 837                         im->im_id = nobodygid;
 838                 }
 839                 return;
 840         }
 841 }
 842
 843 static int
 844 validateascii(char *string, u_int32_t len)
 845 {
 846         int i;
 847
 848         for (i = 0; i < len; i++) {
 849                 if (string[i] == '\0')
 850                         break;
 851
 852                 if (string[i] & 0x80)
 853                         return (-1);
 854         }
 855
 856         if ((i >= len) || string[i] != '\0')
 857                 return (-1);
 858
 859         return (i + 1);
 860 }
 861
 862 static int
 863 addfield(char **bpp, ssize_t *bsizp, char *fld)
 864 {
 865         char ch, *bp = *bpp;
 866         ssize_t bsiz = *bsizp;
 867
 868         while ((ch = *fld++) != '\0' && bsiz > 0) {
 869                 switch(ch) {
 870                 case ' ':
 871                 case '\t':
 872                 case '\n':
 873                 case '\\':
 874                         if (bsiz >= 4) {
 875                                 bp += snprintf(bp, bsiz, "\\%03o", ch);
 876                                 bsiz -= 4;
 877                         }
 878                         break;
 879                 default:
 880                         *bp++ = ch;
 881                         bsiz--;
 882                         break;
 883                 }
 884         }
 885
 886         if (bsiz < 1 || ch != '\0')
 887                 return (-1);
 888
 889         *bp++ = ' ';
 890         bsiz--;
 891
 892         *bpp = bp;
 893         *bsizp = bsiz;
 894
 895         return (0);
 896 }
 897
 898 static int
 899 getfield(char **bpp, char *fld, size_t fldsz)
 900 {
 901         char *bp;
 902         u_int val, n;
 903
 904         while ((bp = strsep(bpp, " ")) != NULL && bp[0] == '\0')
 905                 ;
 906
 907         if (bp == NULL || bp[0] == '\0' || bp[0] == '\n')
 908                 return (-1);
 909
 910         while (*bp != '\0' && fldsz > 1) {
 911                 if (*bp == '\\') {
 912                         if ((n = sscanf(bp, "\\%03o", &val)) != 1)
 913                                 return (-1);
 914                         if (val > (char)-1)
 915                                 return (-1);
 916                         *fld++ = (char)val;
 917                         bp += 4;
 918                 } else {
 919                         *fld++ = *bp;
 920                         bp++;
 921                 }
 922                 fldsz--;
 923         }
 924
 925         if (*bp != '\0')
 926                 return (-1);
 927         *fld = '\0';
 928
 929         return (0);
 930 }
 931 /*
 932  * mydaemon creates a pipe between the partent and child
 933  * process. The parent process will wait until the
 934  * child dies or writes a '1' on the pipe signaling
 935  * that it started successfully.
 936  */
 937 int pipefds[2] = { -1, -1};
 938
 939 void
 940 mydaemon(int nochdir, int noclose)
 941 {
 942         int pid, status, tempfd;
 943
 944         if (pipe(pipefds) < 0)
 945                 err(1, "mydaemon: pipe() failed: errno %d", errno);
 946
 947         if ((pid = fork ()) < 0)
 948                 err(1, "mydaemon: fork() failed: errno %d", errno);
 949
 950         if (pid != 0) {
 951                 /*
 952                  * Parent. Wait for status from child.
 953                  */
 954                 close(pipefds[1]);
 955                 if (read(pipefds[0], &status, 1) != 1)
 956                         exit(1);
 957                 exit (0);
 958         }
 959         /* Child.       */
 960         close(pipefds[0]);
 961         setsid ();
 962         if (nochdir == 0) {
 963                 if (chdir ("/") == -1)
 964                         err(1, "mydaemon: chdir() failed: errno %d", errno);
 965         }
 966
 967         while (pipefds[1] <= 2) {
 968                 pipefds[1] = dup(pipefds[1]);
 969                 if (pipefds[1] < 0)
 970                         err(1, "mydaemon: dup() failed: errno %d", errno);
 971         }
 972
 973         if (noclose == 0) {
 974                 tempfd = open("/dev/null", O_RDWR);
 975                 if (tempfd < 0)
 976                         tempfd = open("/", O_RDONLY);
 977                 if (tempfd >= 0) {
 978                         dup2(tempfd, 0);
 979                         dup2(tempfd, 1);
 980                         dup2(tempfd, 2);
 981                         closeall(3);
 982                 } else
 983                         closeall(0);
 984         }
 985
 986         return;
 987 }
 988 void
 989 release_parent(void)
 990 {
 991         int status;
 992
 993         if (pipefds[1] > 0) {
 994                 if (write(pipefds[1], &status, 1) != 1) {
 995                         err(1, "Writing to parent pipe failed: errno %d (%s)\n",
 996                                 errno, strerror(errno));
 997                 }
 998                 close(pipefds[1]);
 999                 pipefds[1] = -1;
1000         }
1001 }