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 <syslog.h>
  59 #include <pwd.h>
  60 #include <grp.h>
  61 #include <limits.h>
  62 #include <ctype.h>
  63 #include <nfsidmap.h>
  64
  65 #ifdef HAVE_CONFIG_H
  66 #include "config.h"
  67 #endif /* HAVE_CONFIG_H */
  68
  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();
 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 (*)(), int, void *, size_t);
 147 void    mydaemon(int, int);
 148 void    release_parent();
 149
 150 static int verbose = 0;
 151 #define DEFAULT_IDMAP_CACHE_EXPIRY 600 /* seconds */
 152 static int cache_entry_expiration = 0;
 153 static char pipefsdir[PATH_MAX];
 154 static char *nobodyuser, *nobodygroup;
 155 static uid_t nobodyuid;
 156 static gid_t nobodygid;
 157
 158 /* Used by cfg.c */
 159 char *conf_path;
 160
 161 static int
 162 flush_nfsd_cache(char *path, time_t now)
 163 {
 164         int fd;
 165         char stime[20];
 166
 167         sprintf(stime, "%ld\n", now);
 168         fd = open(path, O_RDWR);
 169         if (fd == -1)
 170                 return -1;
 171         write(fd, stime, strlen(stime));
 172         close(fd);
 173         return 0;
 174 }
 175
 176 static int
 177 flush_nfsd_idmap_cache(void)
 178 {
 179         time_t now = time(NULL);
 180         int ret;
 181
 182         ret = flush_nfsd_cache(IC_IDNAME_FLUSH, now);
 183         if (ret)
 184                 return ret;
 185         ret = flush_nfsd_cache(IC_NAMEID_FLUSH, now);
 186         return ret;
 187 }
 188
 189 static void
 190 msg_format(char *rtnbuff, int rtnbuffsize, int errval,
 191            const char *fmt, va_list args)
 192 {
 193         char buff[1024];
 194         int n;
 195
 196         vsnprintf(buff, sizeof(buff), fmt, args);
 197
 198         if ((n = strlen(buff)) > 0 && buff[n-1] == '\n')
 199                 buff[--n] = '\0';
 200
 201         snprintf(rtnbuff, rtnbuffsize, "%s: %s", buff, strerror(errval));
 202 }
 203
 204 static void
 205 idmapd_warn(const char *fmt, ...)
 206 {
 207         int errval = errno;     /* save this! */
 208         char buff[1024];
 209         va_list args;
 210
 211         va_start(args, fmt);
 212         msg_format(buff, sizeof(buff), errval, fmt, args);
 213         va_end(args);
 214
 215         syslog(LOG_WARNING, "%s", buff);
 216 }
 217
 218 static void
 219 idmapd_warnx(const char *fmt, ...)
 220 {
 221         va_list args;
 222
 223         va_start(args, fmt);
 224         vsyslog(LOG_WARNING, fmt, args);
 225         va_end(args);
 226 }
 227
 228 static void
 229 idmapd_err(int eval, const char *fmt, ...)
 230 {
 231         int errval = errno;     /* save this! */
 232         char buff[1024];
 233         va_list args;
 234
 235         va_start(args, fmt);
 236         msg_format(buff, sizeof(buff), errval, fmt, args);
 237         va_end(args);
 238
 239         syslog(LOG_ERR, "%s", buff);
 240         exit(eval);
 241 }
 242
 243 static void
 244 idmapd_errx(int eval, const char *fmt, ...)
 245 {
 246         va_list args;
 247
 248         va_start(args, fmt);
 249         vsyslog(LOG_ERR, fmt, args);
 250         va_end(args);
 251         exit(eval);
 252 }
 253
 254 int
 255 main(int argc, char **argv)
 256 {
 257         int fd = 0, opt, fg = 0, nfsdret = -1;
 258         struct idmap_clientq icq;
 259         struct event rootdirev, clntdirev, svrdirev;
 260         struct event initialize;
 261         struct passwd *pw;
 262         struct group *gr;
 263         struct stat sb;
 264         char *xpipefsdir = NULL;
 265         int serverstart = 1, clientstart = 1;
 266         int ret;
 267         char *progname;
 268
 269         conf_path = _PATH_IDMAPDCONF;
 270         nobodyuser = NFS4NOBODY_USER;
 271         nobodygroup = NFS4NOBODY_GROUP;
 272         strlcpy(pipefsdir, PIPEFS_DIR, sizeof(pipefsdir));
 273
 274         if ((progname = strrchr(argv[0], '/')))
 275                 progname++;
 276         else
 277                 progname = argv[0];
 278         openlog(progname, LOG_PID, LOG_DAEMON);
 279
 280 #define GETOPTSTR "vfd:p:U:G:c:CS"
 281         opterr=0; /* Turn off error messages */
 282         while ((opt = getopt(argc, argv, GETOPTSTR)) != -1) {
 283                 if (opt == 'c')
 284                         conf_path = optarg;
 285                 if (opt == '?') {
 286                         if (strchr(GETOPTSTR, optopt))
 287                                 errx(1, "'-%c' option requires an argument.", optopt);
 288                         else
 289                                 errx(1, "'-%c' is an invalid argument.", optopt);
 290                 }
 291         }
 292         optind = 1;
 293
 294         if (stat(conf_path, &sb) == -1 && (errno == ENOENT || errno == EACCES)) {
 295                 warn("Skipping configuration file \"%s\"", conf_path);
 296                 conf_path = NULL;
 297         } else {
 298                 conf_init();
 299                 verbose = conf_get_num("General", "Verbosity", 0);
 300                 cache_entry_expiration = conf_get_num("General",
 301                                 "Cache-Expiration", DEFAULT_IDMAP_CACHE_EXPIRY);
 302                 CONF_SAVE(xpipefsdir, conf_get_str("General", "Pipefs-Directory"));
 303                 if (xpipefsdir != NULL)
 304                         strlcpy(pipefsdir, xpipefsdir, sizeof(pipefsdir));
 305                 CONF_SAVE(nobodyuser, conf_get_str("Mapping", "Nobody-User"));
 306                 CONF_SAVE(nobodygroup, conf_get_str("Mapping", "Nobody-Group"));
 307         }
 308
 309         while ((opt = getopt(argc, argv, GETOPTSTR)) != -1)
 310                 switch (opt) {
 311                 case 'v':
 312                         verbose++;
 313                         break;
 314                 case 'f':
 315                         fg = 1;
 316                         break;
 317                 case 'p':
 318                         strlcpy(pipefsdir, optarg, sizeof(pipefsdir));
 319                         break;
 320                 case 'd':
 321                 case 'U':
 322                 case 'G':
 323                         errx(1, "the -d, -U, and -G options have been removed;"
 324                                 " please use the configuration file instead.");
 325                 case 'C':
 326                         serverstart = 0;
 327                         break;
 328                 case 'S':
 329                         clientstart = 0;
 330                         break;
 331                 default:
 332                         break;
 333                 }
 334
 335         if (!serverstart && !clientstart)
 336                 errx(1, "it is illegal to specify both -C and -S");
 337
 338         strncat(pipefsdir, "/nfs", sizeof(pipefsdir));
 339
 340         if ((pw = getpwnam(nobodyuser)) == NULL)
 341                 errx(1, "Could not find user \"%s\"", nobodyuser);
 342         nobodyuid = pw->pw_uid;
 343
 344         if ((gr = getgrnam(nobodygroup)) == NULL)
 345                 errx(1, "Could not find group \"%s\"", nobodygroup);
 346         nobodygid = gr->gr_gid;
 347
 348         nfs4_set_debug(verbose, idmapd_warnx);
 349         if (conf_path == NULL)
 350                 conf_path = _PATH_IDMAPDCONF;
 351         if (nfs4_init_name_mapping(conf_path))
 352                 errx(1, "Unable to create name to user id mappings.");
 353
 354         if (!fg)
 355                 mydaemon(0, 0);
 356
 357         event_init();
 358
 359         if (verbose > 0)
 360                 idmapd_warnx("Expiration time is %d seconds.",
 361                              cache_entry_expiration);
 362         if (serverstart) {
 363                 nfsdret = nfsdopen();
 364                 if (nfsdret == 0) {
 365                         ret = flush_nfsd_idmap_cache();
 366                         if (ret)
 367                                 idmapd_errx(1,
 368                                         "main: Failed to flush nfsd idmap cache\n");
 369                 }
 370         }
 371
 372         if (clientstart) {
 373                 struct timeval now = {
 374                         .tv_sec = 0,
 375                         .tv_usec = 0,
 376                 };
 377
 378                 if (cache_entry_expiration != DEFAULT_IDMAP_CACHE_EXPIRY) {
 379                         int timeout_fd, len;
 380                         char timeout_buf[12];
 381                         if ((timeout_fd = open(CLIENT_CACHE_TIMEOUT_FILE,
 382                                                O_RDWR)) == -1) {
 383                                 idmapd_warnx("Unable to open '%s' to set "
 384                                              "client cache expiration time "
 385                                              "to %d seconds\n",
 386                                              CLIENT_CACHE_TIMEOUT_FILE,
 387                                              cache_entry_expiration);
 388                         } else {
 389                                 len = snprintf(timeout_buf, sizeof(timeout_buf),
 390                                                "%d", cache_entry_expiration);
 391                                 if ((write(timeout_fd, timeout_buf, len)) != len)
 392                                         idmapd_warnx("Error writing '%s' to "
 393                                                      "'%s' to set client "
 394                                                      "cache expiration time\n",
 395                                                      timeout_buf,
 396                                                      CLIENT_CACHE_TIMEOUT_FILE);
 397                                 close(timeout_fd);
 398                         }
 399                 }
 400
 401                 if ((fd = open(pipefsdir, O_RDONLY)) == -1)
 402                         idmapd_err(1, "main: open(%s)", pipefsdir);
 403
 404                 if (fcntl(fd, F_SETSIG, SIGUSR1) == -1)
 405                         idmapd_err(1, "main: fcntl(%s)", pipefsdir);
 406
 407                 if (fcntl(fd, F_NOTIFY,
 408                         DN_CREATE | DN_DELETE | DN_MODIFY | DN_MULTISHOT) == -1)
 409                         idmapd_err(1, "main: fcntl(%s)", pipefsdir);
 410
 411                 TAILQ_INIT(&icq);
 412
 413                 /* These events are persistent */
 414                 signal_set(&rootdirev, SIGUSR1, dirscancb, &icq);
 415                 signal_add(&rootdirev, NULL);
 416                 signal_set(&clntdirev, SIGUSR2, clntscancb, &icq);
 417                 signal_add(&clntdirev, NULL);
 418                 signal_set(&svrdirev, SIGHUP, svrreopen, NULL);
 419                 signal_add(&svrdirev, NULL);
 420
 421                 /* Fetch current state */
 422                 /* (Delay till start of event_dispatch to avoid possibly losing
 423                  * a SIGUSR1 between here and the call to event_dispatch().) */
 424                 evtimer_set(&initialize, dirscancb, &icq);
 425                 evtimer_add(&initialize, &now);
 426         }
 427
 428         if (nfsdret != 0 && fd == 0)
 429                 idmapd_errx(1, "main: Neither NFS client nor NFSd found");
 430
 431         release_parent();
 432
 433         if (event_dispatch() < 0)
 434                 idmapd_errx(1, "main: event_dispatch returns errno %d (%s)",
 435                             errno, strerror(errno));
 436         /* NOTREACHED */
 437         return 1;
 438 }
 439
 440 static void
 441 dirscancb(int fd, short which, void *data)
 442 {
 443         int nent, i;
 444         struct dirent **ents;
 445         struct idmap_client *ic;
 446         char path[PATH_MAX];
 447         struct idmap_clientq *icq = data;
 448
 449         nent = scandir(pipefsdir, &ents, NULL, alphasort);
 450         if (nent == -1) {
 451                 idmapd_warn("dirscancb: scandir(%s)", pipefsdir);
 452                 return;
 453         }
 454
 455         for (i = 0;  i < nent; i++) {
 456                 if (ents[i]->d_reclen > 4 &&
 457                     strncmp(ents[i]->d_name, "clnt", 4) == 0) {
 458                         TAILQ_FOREACH(ic, icq, ic_next)
 459                             if (strcmp(ents[i]->d_name + 4, ic->ic_clid) == 0)
 460                                     break;
 461                         if (ic != NULL)
 462                                 goto next;
 463
 464                         if ((ic = calloc(1, sizeof(*ic))) == NULL)
 465                                 return;
 466                         strlcpy(ic->ic_clid, ents[i]->d_name + 4,
 467                             sizeof(ic->ic_clid));
 468                         path[0] = '\0';
 469                         snprintf(path, sizeof(path), "%s/%s",
 470                             pipefsdir, ents[i]->d_name);
 471
 472                         if ((ic->ic_dirfd = open(path, O_RDONLY, 0)) == -1) {
 473                                 idmapd_warn("dirscancb: open(%s)", path);
 474                                 free(ic);
 475                                 return;
 476                         }
 477
 478                         strlcat(path, "/idmap", sizeof(path));
 479                         strlcpy(ic->ic_path, path, sizeof(ic->ic_path));
 480
 481                         if (verbose > 0)
 482                                 idmapd_warnx("New client: %s", ic->ic_clid);
 483
 484                         if (nfsopen(ic) == -1) {
 485                                 close(ic->ic_dirfd);
 486                                 free(ic);
 487                                 return;
 488                         }
 489
 490                         ic->ic_id = "Client";
 491
 492                         TAILQ_INSERT_TAIL(icq, ic, ic_next);
 493
 494                 next:
 495                         ic->ic_scanned = 1;
 496                 }
 497         }
 498
 499         TAILQ_FOREACH(ic, icq, ic_next) {
 500                 if (!ic->ic_scanned) {
 501                         event_del(&ic->ic_event);
 502                         close(ic->ic_fd);
 503                         close(ic->ic_dirfd);
 504                         TAILQ_REMOVE(icq, ic, ic_next);
 505                         if (verbose > 0) {
 506                                 idmapd_warnx("Stale client: %s", ic->ic_clid);
 507                                 idmapd_warnx("\t-> closed %s", ic->ic_path);
 508                         }
 509                         free(ic);
 510                 } else
 511                         ic->ic_scanned = 0;
 512         }
 513         return;
 514 }
 515
 516 static void
 517 svrreopen(int fd, short which, void *data)
 518 {
 519         nfsdreopen();
 520 }
 521
 522 static void
 523 clntscancb(int fd, short which, void *data)
 524 {
 525         struct idmap_clientq *icq = data;
 526         struct idmap_client *ic;
 527
 528         TAILQ_FOREACH(ic, icq, ic_next)
 529                 if (ic->ic_fd == -1 && nfsopen(ic) == -1) {
 530                         close(ic->ic_dirfd);
 531                         TAILQ_REMOVE(icq, ic, ic_next);
 532                         free(ic);
 533                 }
 534 }
 535
 536 static void
 537 nfsdcb(int fd, short which, void *data)
 538 {
 539         struct idmap_client *ic = data;
 540         struct idmap_msg im;
 541         u_char buf[IDMAP_MAXMSGSZ + 1];
 542         size_t len, bsiz;
 543         char *bp, typebuf[IDMAP_MAXMSGSZ],
 544                 buf1[IDMAP_MAXMSGSZ], authbuf[IDMAP_MAXMSGSZ], *p;
 545         unsigned long tmp;
 546
 547         if (which != EV_READ)
 548                 goto out;
 549
 550         if ((len = read(ic->ic_fd, buf, sizeof(buf))) == -1) {
 551                 idmapd_warnx("nfsdcb: read(%s) failed: errno %d (%s)",
 552                              ic->ic_path, errno, strerror(errno));
 553                 goto out;
 554         }
 555
 556         /* Get rid of newline and terminate buffer*/
 557         buf[len - 1] = '\0';
 558         bp = buf;
 559
 560         memset(&im, 0, sizeof(im));
 561
 562         /* Authentication name -- ignored for now*/
 563         if (getfield(&bp, authbuf, sizeof(authbuf)) == -1) {
 564                 idmapd_warnx("nfsdcb: bad authentication name in upcall\n");
 565                 return;
 566         }
 567         if (getfield(&bp, typebuf, sizeof(typebuf)) == -1) {
 568                 idmapd_warnx("nfsdcb: bad type in upcall\n");
 569                 return;
 570         }
 571         if (verbose > 0)
 572                 idmapd_warnx("nfsdcb: authbuf=%s authtype=%s",
 573                              authbuf, typebuf);
 574
 575         im.im_type = strcmp(typebuf, "user") == 0 ?
 576                 IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
 577
 578         switch (ic->ic_which) {
 579         case IC_NAMEID:
 580                 im.im_conv = IDMAP_CONV_NAMETOID;
 581                 if (getfield(&bp, im.im_name, sizeof(im.im_name)) == -1) {
 582                         idmapd_warnx("nfsdcb: bad name in upcall\n");
 583                         return;
 584                 }
 585                 break;
 586         case IC_IDNAME:
 587                 im.im_conv = IDMAP_CONV_IDTONAME;
 588                 if (getfield(&bp, buf1, sizeof(buf1)) == -1) {
 589                         idmapd_warnx("nfsdcb: bad id in upcall\n");
 590                         return;
 591                 }
 592                 tmp = strtoul(buf1, (char **)NULL, 10);
 593                 im.im_id = (u_int32_t)tmp;
 594                 if ((tmp == ULONG_MAX && errno == ERANGE)
 595                                 || (unsigned long)im.im_id != tmp) {
 596                         idmapd_warnx("nfsdcb: id '%s' too big!\n", buf1);
 597                         return;
 598                 }
 599                 break;
 600         default:
 601                 idmapd_warnx("nfsdcb: Unknown which type %d", ic->ic_which);
 602                 return;
 603         }
 604
 605         imconv(ic, &im);
 606
 607         buf[0] = '\0';
 608         bp = buf;
 609         bsiz = sizeof(buf);
 610
 611         /* Authentication name */
 612         addfield(&bp, &bsiz, authbuf);
 613
 614         switch (ic->ic_which) {
 615         case IC_NAMEID:
 616                 /* Type */
 617                 p = im.im_type == IDMAP_TYPE_USER ? "user" : "group";
 618                 addfield(&bp, &bsiz, p);
 619                 /* Name */
 620                 addfield(&bp, &bsiz, im.im_name);
 621                 /* expiry */
 622                 snprintf(buf1, sizeof(buf1), "%lu",
 623                          time(NULL) + cache_entry_expiration);
 624                 addfield(&bp, &bsiz, buf1);
 625                 /* ID */
 626                 snprintf(buf1, sizeof(buf1), "%u", im.im_id);
 627                 addfield(&bp, &bsiz, buf1);
 628
 629                 //if (bsiz == sizeof(buf)) /* XXX */
 630
 631                 bp[-1] = '\n';
 632
 633                 break;
 634         case IC_IDNAME:
 635                 /* Type */
 636                 p = im.im_type == IDMAP_TYPE_USER ? "user" : "group";
 637                 addfield(&bp, &bsiz, p);
 638                 /* ID */
 639                 snprintf(buf1, sizeof(buf1), "%u", im.im_id);
 640                 addfield(&bp, &bsiz, buf1);
 641                 /* expiry */
 642                 snprintf(buf1, sizeof(buf1), "%lu",
 643                          time(NULL) + cache_entry_expiration);
 644                 addfield(&bp, &bsiz, buf1);
 645                 /* Name */
 646                 addfield(&bp, &bsiz, im.im_name);
 647
 648                 bp[-1] = '\n';
 649
 650                 break;
 651         default:
 652                 idmapd_warnx("nfsdcb: Unknown which type %d", ic->ic_which);
 653                 return;
 654         }
 655
 656         bsiz = sizeof(buf) - bsiz;
 657
 658         if (atomicio(write, ic->ic_fd, buf, bsiz) != bsiz)
 659                 idmapd_warnx("nfsdcb: write(%s) failed: errno %d (%s)",
 660                              ic->ic_path, errno, strerror(errno));
 661
 662 out:
 663         event_add(&ic->ic_event, NULL);
 664 }
 665
 666 static void
 667 imconv(struct idmap_client *ic, struct idmap_msg *im)
 668 {
 669         switch (im->im_conv) {
 670         case IDMAP_CONV_IDTONAME:
 671                 idtonameres(im);
 672                 if (verbose > 1)
 673                         idmapd_warnx("%s %s: (%s) id \"%d\" -> name \"%s\"",
 674                             ic->ic_id, ic->ic_clid,
 675                             im->im_type == IDMAP_TYPE_USER ? "user" : "group",
 676                             im->im_id, im->im_name);
 677                 break;
 678         case IDMAP_CONV_NAMETOID:
 679                 if (validateascii(im->im_name, sizeof(im->im_name)) == -1) {
 680                         im->im_status |= IDMAP_STATUS_INVALIDMSG;
 681                         return;
 682                 }
 683                 nametoidres(im);
 684                 if (verbose > 1)
 685                         idmapd_warnx("%s %s: (%s) name \"%s\" -> id \"%d\"",
 686                             ic->ic_id, ic->ic_clid,
 687                             im->im_type == IDMAP_TYPE_USER ? "user" : "group",
 688                             im->im_name, im->im_id);
 689                 break;
 690         default:
 691                 idmapd_warnx("imconv: Invalid conversion type (%d) in message",
 692                              im->im_conv);
 693                 im->im_status |= IDMAP_STATUS_INVALIDMSG;
 694                 break;
 695         }
 696 }
 697
 698 static void
 699 nfscb(int fd, short which, void *data)
 700 {
 701         struct idmap_client *ic = data;
 702         struct idmap_msg im;
 703
 704         if (which != EV_READ)
 705                 goto out;
 706
 707         if (atomicio(read, ic->ic_fd, &im, sizeof(im)) != sizeof(im)) {
 708                 if (verbose > 0)
 709                         idmapd_warn("nfscb: read(%s)", ic->ic_path);
 710                 if (errno == EPIPE)
 711                         return;
 712                 goto out;
 713         }
 714
 715         imconv(ic, &im);
 716
 717         if (atomicio(write, ic->ic_fd, &im, sizeof(im)) != sizeof(im))
 718                 idmapd_warn("nfscb: write(%s)", ic->ic_path);
 719 out:
 720         event_add(&ic->ic_event, NULL);
 721 }
 722
 723 static void
 724 nfsdreopen_one(struct idmap_client *ic)
 725 {
 726         int fd;
 727
 728         if (verbose > 0)
 729                 idmapd_warnx("ReOpening %s", ic->ic_path);
 730
 731         if ((fd = open(ic->ic_path, O_RDWR, 0)) != -1) {
 732                 if ((ic->ic_event.ev_flags & EVLIST_INIT))
 733                         event_del(&ic->ic_event);
 734                 if (ic->ic_fd != -1)
 735                         close(ic->ic_fd);
 736
 737                 ic->ic_event.ev_fd = ic->ic_fd = fd;
 738                 event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfsdcb, ic);
 739                 event_add(&ic->ic_event, NULL);
 740         } else {
 741                 idmapd_warnx("nfsdreopen: Opening '%s' failed: errno %d (%s)",
 742                         ic->ic_path, errno, strerror(errno));
 743         }
 744 }
 745
 746 static void
 747 nfsdreopen()
 748 {
 749         nfsdreopen_one(&nfsd_ic[IC_NAMEID]);
 750         nfsdreopen_one(&nfsd_ic[IC_IDNAME]);
 751         return;
 752 }
 753
 754 static int
 755 nfsdopen()
 756 {
 757         return ((nfsdopenone(&nfsd_ic[IC_NAMEID]) == 0 &&
 758                     nfsdopenone(&nfsd_ic[IC_IDNAME]) == 0) ? 0 : -1);
 759 }
 760
 761 static int
 762 nfsdopenone(struct idmap_client *ic)
 763 {
 764         if ((ic->ic_fd = open(ic->ic_path, O_RDWR, 0)) == -1) {
 765                 if (verbose > 0)
 766                         idmapd_warnx("nfsdopenone: Opening %s failed: "
 767                                 "errno %d (%s)",
 768                                 ic->ic_path, errno, strerror(errno));
 769                 return (-1);
 770         }
 771
 772         event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfsdcb, ic);
 773         event_add(&ic->ic_event, NULL);
 774
 775         if (verbose > 0)
 776                 idmapd_warnx("Opened %s", ic->ic_path);
 777
 778         return (0);
 779 }
 780
 781 static int
 782 nfsopen(struct idmap_client *ic)
 783 {
 784         if ((ic->ic_fd = open(ic->ic_path, O_RDWR, 0)) == -1) {
 785                 switch (errno) {
 786                 case ENOENT:
 787                         fcntl(ic->ic_dirfd, F_SETSIG, SIGUSR2);
 788                         fcntl(ic->ic_dirfd, F_NOTIFY,
 789                             DN_CREATE | DN_DELETE | DN_MULTISHOT);
 790                         break;
 791                 default:
 792                         idmapd_warn("nfsopen: open(%s)", ic->ic_path);
 793                         return (-1);
 794                 }
 795         } else {
 796                 event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfscb, ic);
 797                 event_add(&ic->ic_event, NULL);
 798                 fcntl(ic->ic_dirfd, F_SETSIG, 0);
 799                 fcntl(ic->ic_dirfd, F_NOTIFY, 0);
 800                 if (verbose > 0)
 801                         idmapd_warnx("Opened %s", ic->ic_path);
 802         }
 803
 804         return (0);
 805 }
 806
 807 static void
 808 idtonameres(struct idmap_msg *im)
 809 {
 810         char domain[NFS4_MAX_DOMAIN_LEN];
 811         int ret = 0;
 812
 813         ret = nfs4_get_default_domain(NULL, domain, sizeof(domain));
 814         switch (im->im_type) {
 815         case IDMAP_TYPE_USER:
 816                 ret = nfs4_uid_to_name(im->im_id, domain, im->im_name,
 817                                 sizeof(im->im_name));
 818                 if (ret) {
 819                         if (strlen(nobodyuser) < sizeof(im->im_name))
 820                                 strcpy(im->im_name, nobodyuser);
 821                         else
 822                                 strcpy(im->im_name, NFS4NOBODY_USER);
 823                 }
 824                 break;
 825         case IDMAP_TYPE_GROUP:
 826                 ret = nfs4_gid_to_name(im->im_id, domain, im->im_name,
 827                                 sizeof(im->im_name));
 828                 if (ret) {
 829                         if (strlen(nobodygroup) < sizeof(im->im_name))
 830                                 strcpy(im->im_name, nobodygroup);
 831                         else
 832                                 strcpy(im->im_name, NFS4NOBODY_GROUP);
 833                 }
 834                 break;
 835         }
 836         /* XXX Hack? */
 837         im->im_status = IDMAP_STATUS_SUCCESS;
 838 }
 839
 840 static void
 841 nametoidres(struct idmap_msg *im)
 842 {
 843         uid_t uid;
 844         gid_t gid;
 845         int ret = 0;
 846
 847         /* XXX: nobody fallbacks shouldn't always happen:
 848          *      server id -> name should be OK
 849          *      client name -> id should be OK
 850          * but not otherwise */
 851         /* XXX: move nobody stuff to library calls
 852          * (nfs4_get_nobody_user(domain), nfs4_get_nobody_group(domain)) */
 853         /* XXX: should make this call higher up in the call chain (so we'd
 854          * have a chance on looking up server/whatever. */
 855         switch (im->im_type) {
 856         case IDMAP_TYPE_USER:
 857                 ret = nfs4_name_to_uid(im->im_name, &uid);
 858                 im->im_id = (u_int32_t) uid;
 859                 if (ret)
 860                         im->im_id = nobodyuid;
 861                 break;
 862         case IDMAP_TYPE_GROUP:
 863                 ret = nfs4_name_to_gid(im->im_name, &gid);
 864                 im->im_id = (u_int32_t) gid;
 865                 if (ret)
 866                         im->im_id = nobodygid;
 867                 break;
 868         }
 869         /* XXX? */
 870         im->im_status = IDMAP_STATUS_SUCCESS;
 871 }
 872
 873 static int
 874 validateascii(char *string, u_int32_t len)
 875 {
 876         int i;
 877
 878         for (i = 0; i < len; i++) {
 879                 if (string[i] == '\0')
 880                         break;
 881
 882                 if (string[i] & 0x80)
 883                         return (-1);
 884         }
 885
 886         if (string[i] != '\0')
 887                 return (-1);
 888
 889         return (i + 1);
 890 }
 891
 892 static int
 893 addfield(char **bpp, ssize_t *bsizp, char *fld)
 894 {
 895         char ch, *bp = *bpp;
 896         ssize_t bsiz = *bsizp;
 897
 898         while ((ch = *fld++) != '\0' && bsiz > 0) {
 899                 switch(ch) {
 900                 case ' ':
 901                 case '\t':
 902                 case '\n':
 903                 case '\\':
 904                         if (bsiz >= 4) {
 905                                 bp += snprintf(bp, bsiz, "\\%03o", ch);
 906                                 bsiz -= 4;
 907                         }
 908                         break;
 909                 default:
 910                         *bp++ = ch;
 911                         bsiz--;
 912                         break;
 913                 }
 914         }
 915
 916         if (bsiz < 1 || ch != '\0')
 917                 return (-1);
 918
 919         *bp++ = ' ';
 920         bsiz--;
 921
 922         *bpp = bp;
 923         *bsizp = bsiz;
 924
 925         return (0);
 926 }
 927
 928 static int
 929 getfield(char **bpp, char *fld, size_t fldsz)
 930 {
 931         char *bp;
 932         u_int val, n;
 933
 934         while ((bp = strsep(bpp, " ")) != NULL && bp[0] == '\0')
 935                 ;
 936
 937         if (bp == NULL || bp[0] == '\0' || bp[0] == '\n')
 938                 return (-1);
 939
 940         while (*bp != '\0' && fldsz > 1) {
 941                 if (*bp == '\\') {
 942                         if ((n = sscanf(bp, "\\%03o", &val)) != 1)
 943                                 return (-1);
 944                         if (val > (char)-1)
 945                                 return (-1);
 946                         *fld++ = (char)val;
 947                         bp += 4;
 948                 } else {
 949                         *fld++ = *bp;
 950                         bp++;
 951                 }
 952                 fldsz--;
 953         }
 954
 955         if (*bp != '\0')
 956                 return (-1);
 957         *fld = '\0';
 958
 959         return (0);
 960 }
 961 /*
 962  * mydaemon creates a pipe between the partent and child
 963  * process. The parent process will wait until the
 964  * child dies or writes a '1' on the pipe signaling
 965  * that it started successfully.
 966  */
 967 int pipefds[2] = { -1, -1};
 968
 969 void
 970 mydaemon(int nochdir, int noclose)
 971 {
 972         int pid, status, tempfd;
 973
 974         if (pipe(pipefds) < 0)
 975                 err(1, "mydaemon: pipe() failed: errno %d", errno);
 976
 977         if ((pid = fork ()) < 0)
 978                 err(1, "mydaemon: fork() failed: errno %d", errno);
 979
 980         if (pid != 0) {
 981                 /*
 982                  * Parent. Wait for status from child.
 983                  */
 984                 close(pipefds[1]);
 985                 if (read(pipefds[0], &status, 1) != 1)
 986                         exit(1);
 987                 exit (0);
 988         }
 989         /* Child.       */
 990         close(pipefds[0]);
 991         setsid ();
 992         if (nochdir == 0) {
 993                 if (chdir ("/") == -1)
 994                         err(1, "mydaemon: chdir() failed: errno %d", errno);
 995         }
 996
 997         while (pipefds[1] <= 2) {
 998                 pipefds[1] = dup(pipefds[1]);
 999                 if (pipefds[1] < 0)
1000                         err(1, "mydaemon: dup() failed: errno %d", errno);
1001         }
1002
1003         if (noclose == 0) {
1004                 tempfd = open("/dev/null", O_RDWR);
1005                 dup2(tempfd, 0);
1006                 dup2(tempfd, 1);
1007                 dup2(tempfd, 2);
1008                 closeall(3);
1009         }
1010
1011         return;
1012 }
1013 void
1014 release_parent()
1015 {
1016         int status;
1017
1018         if (pipefds[1] > 0) {
1019                 write(pipefds[1], &status, 1);
1020                 close(pipefds[1]);
1021                 pipefds[1] = -1;
1022         }
1023 }