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 #ifdef HAVE_NFS4_SET_DEBUG
 349         nfs4_set_debug(verbose, idmapd_warnx);
 350 #endif
 351         if (conf_path == NULL)
 352                 conf_path = _PATH_IDMAPDCONF;
 353         if (nfs4_init_name_mapping(conf_path))
 354                 errx(1, "Unable to create name to user id mappings.");
 355
 356         if (!fg)
 357                 mydaemon(0, 0);
 358
 359         event_init();
 360
 361         if (verbose > 0)
 362                 idmapd_warnx("Expiration time is %d seconds.",
 363                              cache_entry_expiration);
 364         if (serverstart) {
 365                 nfsdret = nfsdopen();
 366                 if (nfsdret == 0) {
 367                         ret = flush_nfsd_idmap_cache();
 368                         if (ret)
 369                                 idmapd_errx(1,
 370                                         "main: Failed to flush nfsd idmap cache\n");
 371                 }
 372         }
 373
 374         if (clientstart) {
 375                 struct timeval now = {
 376                         .tv_sec = 0,
 377                         .tv_usec = 0,
 378                 };
 379
 380                 if (cache_entry_expiration != DEFAULT_IDMAP_CACHE_EXPIRY) {
 381                         int timeout_fd, len;
 382                         char timeout_buf[12];
 383                         if ((timeout_fd = open(CLIENT_CACHE_TIMEOUT_FILE,
 384                                                O_RDWR)) == -1) {
 385                                 idmapd_warnx("Unable to open '%s' to set "
 386                                              "client cache expiration time "
 387                                              "to %d seconds\n",
 388                                              CLIENT_CACHE_TIMEOUT_FILE,
 389                                              cache_entry_expiration);
 390                         } else {
 391                                 len = snprintf(timeout_buf, sizeof(timeout_buf),
 392                                                "%d", cache_entry_expiration);
 393                                 if ((write(timeout_fd, timeout_buf, len)) != len)
 394                                         idmapd_warnx("Error writing '%s' to "
 395                                                      "'%s' to set client "
 396                                                      "cache expiration time\n",
 397                                                      timeout_buf,
 398                                                      CLIENT_CACHE_TIMEOUT_FILE);
 399                                 close(timeout_fd);
 400                         }
 401                 }
 402
 403                 if ((fd = open(pipefsdir, O_RDONLY)) == -1)
 404                         idmapd_err(1, "main: open(%s)", pipefsdir);
 405
 406                 if (fcntl(fd, F_SETSIG, SIGUSR1) == -1)
 407                         idmapd_err(1, "main: fcntl(%s)", pipefsdir);
 408
 409                 if (fcntl(fd, F_NOTIFY,
 410                         DN_CREATE | DN_DELETE | DN_MODIFY | DN_MULTISHOT) == -1)
 411                         idmapd_err(1, "main: fcntl(%s)", pipefsdir);
 412
 413                 TAILQ_INIT(&icq);
 414
 415                 /* These events are persistent */
 416                 signal_set(&rootdirev, SIGUSR1, dirscancb, &icq);
 417                 signal_add(&rootdirev, NULL);
 418                 signal_set(&clntdirev, SIGUSR2, clntscancb, &icq);
 419                 signal_add(&clntdirev, NULL);
 420                 signal_set(&svrdirev, SIGHUP, svrreopen, NULL);
 421                 signal_add(&svrdirev, NULL);
 422
 423                 /* Fetch current state */
 424                 /* (Delay till start of event_dispatch to avoid possibly losing
 425                  * a SIGUSR1 between here and the call to event_dispatch().) */
 426                 evtimer_set(&initialize, dirscancb, &icq);
 427                 evtimer_add(&initialize, &now);
 428         }
 429
 430         if (nfsdret != 0 && fd == 0)
 431                 idmapd_errx(1, "main: Neither NFS client nor NFSd found");
 432
 433         release_parent();
 434
 435         if (event_dispatch() < 0)
 436                 idmapd_errx(1, "main: event_dispatch returns errno %d (%s)",
 437                             errno, strerror(errno));
 438         /* NOTREACHED */
 439         return 1;
 440 }
 441
 442 static void
 443 dirscancb(int fd, short which, void *data)
 444 {
 445         int nent, i;
 446         struct dirent **ents;
 447         struct idmap_client *ic;
 448         char path[PATH_MAX];
 449         struct idmap_clientq *icq = data;
 450
 451         nent = scandir(pipefsdir, &ents, NULL, alphasort);
 452         if (nent == -1) {
 453                 idmapd_warn("dirscancb: scandir(%s)", pipefsdir);
 454                 return;
 455         }
 456
 457         for (i = 0;  i < nent; i++) {
 458                 if (ents[i]->d_reclen > 4 &&
 459                     strncmp(ents[i]->d_name, "clnt", 4) == 0) {
 460                         TAILQ_FOREACH(ic, icq, ic_next)
 461                             if (strcmp(ents[i]->d_name + 4, ic->ic_clid) == 0)
 462                                     break;
 463                         if (ic != NULL)
 464                                 goto next;
 465
 466                         if ((ic = calloc(1, sizeof(*ic))) == NULL)
 467                                 goto out;
 468                         strlcpy(ic->ic_clid, ents[i]->d_name + 4,
 469                             sizeof(ic->ic_clid));
 470                         path[0] = '\0';
 471                         snprintf(path, sizeof(path), "%s/%s",
 472                             pipefsdir, ents[i]->d_name);
 473
 474                         if ((ic->ic_dirfd = open(path, O_RDONLY, 0)) == -1) {
 475                                 idmapd_warn("dirscancb: open(%s)", path);
 476                                 free(ic);
 477                                 goto out;
 478                         }
 479
 480                         strlcat(path, "/idmap", sizeof(path));
 481                         strlcpy(ic->ic_path, path, sizeof(ic->ic_path));
 482
 483                         if (verbose > 0)
 484                                 idmapd_warnx("New client: %s", ic->ic_clid);
 485
 486                         if (nfsopen(ic) == -1) {
 487                                 close(ic->ic_dirfd);
 488                                 free(ic);
 489                                 goto out;
 490                         }
 491
 492                         ic->ic_id = "Client";
 493
 494                         TAILQ_INSERT_TAIL(icq, ic, ic_next);
 495
 496                 next:
 497                         ic->ic_scanned = 1;
 498                 }
 499         }
 500
 501         TAILQ_FOREACH(ic, icq, ic_next) {
 502                 if (!ic->ic_scanned) {
 503                         event_del(&ic->ic_event);
 504                         close(ic->ic_fd);
 505                         close(ic->ic_dirfd);
 506                         TAILQ_REMOVE(icq, ic, ic_next);
 507                         if (verbose > 0) {
 508                                 idmapd_warnx("Stale client: %s", ic->ic_clid);
 509                                 idmapd_warnx("\t-> closed %s", ic->ic_path);
 510                         }
 511                         free(ic);
 512                 } else
 513                         ic->ic_scanned = 0;
 514         }
 515
 516 out:
 517         for (i = 0;  i < nent; i++)
 518                 free(ents[i]);
 519         free(ents);
 520         return;
 521 }
 522
 523 static void
 524 svrreopen(int fd, short which, void *data)
 525 {
 526         nfsdreopen();
 527 }
 528
 529 static void
 530 clntscancb(int fd, short which, void *data)
 531 {
 532         struct idmap_clientq *icq = data;
 533         struct idmap_client *ic;
 534
 535         TAILQ_FOREACH(ic, icq, ic_next)
 536                 if (ic->ic_fd == -1 && nfsopen(ic) == -1) {
 537                         close(ic->ic_dirfd);
 538                         TAILQ_REMOVE(icq, ic, ic_next);
 539                         free(ic);
 540                 }
 541 }
 542
 543 static void
 544 nfsdcb(int fd, short which, void *data)
 545 {
 546         struct idmap_client *ic = data;
 547         struct idmap_msg im;
 548         u_char buf[IDMAP_MAXMSGSZ + 1];
 549         size_t len;
 550         ssize_t bsiz;
 551         char *bp, typebuf[IDMAP_MAXMSGSZ],
 552                 buf1[IDMAP_MAXMSGSZ], authbuf[IDMAP_MAXMSGSZ], *p;
 553         unsigned long tmp;
 554
 555         if (which != EV_READ)
 556                 goto out;
 557
 558         if ((len = read(ic->ic_fd, buf, sizeof(buf))) <= 0) {
 559                 idmapd_warnx("nfsdcb: read(%s) failed: errno %d (%s)",
 560                              ic->ic_path, len?errno:0,
 561                              len?strerror(errno):"End of File");
 562                 goto out;
 563         }
 564
 565         /* Get rid of newline and terminate buffer*/
 566         buf[len - 1] = '\0';
 567         bp = (char *)buf;
 568
 569         memset(&im, 0, sizeof(im));
 570
 571         /* Authentication name -- ignored for now*/
 572         if (getfield(&bp, authbuf, sizeof(authbuf)) == -1) {
 573                 idmapd_warnx("nfsdcb: bad authentication name in upcall\n");
 574                 return;
 575         }
 576         if (getfield(&bp, typebuf, sizeof(typebuf)) == -1) {
 577                 idmapd_warnx("nfsdcb: bad type in upcall\n");
 578                 return;
 579         }
 580         if (verbose > 0)
 581                 idmapd_warnx("nfsdcb: authbuf=%s authtype=%s",
 582                              authbuf, typebuf);
 583
 584         im.im_type = strcmp(typebuf, "user") == 0 ?
 585                 IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
 586
 587         switch (ic->ic_which) {
 588         case IC_NAMEID:
 589                 im.im_conv = IDMAP_CONV_NAMETOID;
 590                 if (getfield(&bp, im.im_name, sizeof(im.im_name)) == -1) {
 591                         idmapd_warnx("nfsdcb: bad name in upcall\n");
 592                         return;
 593                 }
 594                 break;
 595         case IC_IDNAME:
 596                 im.im_conv = IDMAP_CONV_IDTONAME;
 597                 if (getfield(&bp, buf1, sizeof(buf1)) == -1) {
 598                         idmapd_warnx("nfsdcb: bad id in upcall\n");
 599                         return;
 600                 }
 601                 tmp = strtoul(buf1, (char **)NULL, 10);
 602                 im.im_id = (u_int32_t)tmp;
 603                 if ((tmp == ULONG_MAX && errno == ERANGE)
 604                                 || (unsigned long)im.im_id != tmp) {
 605                         idmapd_warnx("nfsdcb: id '%s' too big!\n", buf1);
 606                         return;
 607                 }
 608                 break;
 609         default:
 610                 idmapd_warnx("nfsdcb: Unknown which type %d", ic->ic_which);
 611                 return;
 612         }
 613
 614         imconv(ic, &im);
 615
 616         buf[0] = '\0';
 617         bp = (char *)buf;
 618         bsiz = sizeof(buf);
 619
 620         /* Authentication name */
 621         addfield(&bp, &bsiz, authbuf);
 622
 623         switch (ic->ic_which) {
 624         case IC_NAMEID:
 625                 /* Type */
 626                 p = im.im_type == IDMAP_TYPE_USER ? "user" : "group";
 627                 addfield(&bp, &bsiz, p);
 628                 /* Name */
 629                 addfield(&bp, &bsiz, im.im_name);
 630                 /* expiry */
 631                 snprintf(buf1, sizeof(buf1), "%lu",
 632                          time(NULL) + cache_entry_expiration);
 633                 addfield(&bp, &bsiz, buf1);
 634                 /* Note that we don't want to write the id if the mapping
 635                  * failed; instead, by leaving it off, we write a negative
 636                  * cache entry which will result in an error returned to
 637                  * the client.  We don't want a chown or setacl referring
 638                  * to an unknown user to result in giving permissions to
 639                  * "nobody"! */
 640                 if (im.im_status == IDMAP_STATUS_SUCCESS) {
 641                         /* ID */
 642                         snprintf(buf1, sizeof(buf1), "%u", im.im_id);
 643                         addfield(&bp, &bsiz, buf1);
 644
 645                 }
 646                 //if (bsiz == sizeof(buf)) /* XXX */
 647
 648                 bp[-1] = '\n';
 649
 650                 break;
 651         case IC_IDNAME:
 652                 /* Type */
 653                 p = im.im_type == IDMAP_TYPE_USER ? "user" : "group";
 654                 addfield(&bp, &bsiz, p);
 655                 /* ID */
 656                 snprintf(buf1, sizeof(buf1), "%u", im.im_id);
 657                 addfield(&bp, &bsiz, buf1);
 658                 /* expiry */
 659                 snprintf(buf1, sizeof(buf1), "%lu",
 660                          time(NULL) + cache_entry_expiration);
 661                 addfield(&bp, &bsiz, buf1);
 662                 /* Note we're ignoring the status field in this case; we'll
 663                  * just map to nobody instead. */
 664                 /* Name */
 665                 addfield(&bp, &bsiz, im.im_name);
 666
 667                 bp[-1] = '\n';
 668
 669                 break;
 670         default:
 671                 idmapd_warnx("nfsdcb: Unknown which type %d", ic->ic_which);
 672                 return;
 673         }
 674
 675         bsiz = sizeof(buf) - bsiz;
 676
 677         if (atomicio(write, ic->ic_fd, buf, bsiz) != bsiz)
 678                 idmapd_warnx("nfsdcb: write(%s) failed: errno %d (%s)",
 679                              ic->ic_path, errno, strerror(errno));
 680
 681 out:
 682         event_add(&ic->ic_event, NULL);
 683 }
 684
 685 static void
 686 imconv(struct idmap_client *ic, struct idmap_msg *im)
 687 {
 688         switch (im->im_conv) {
 689         case IDMAP_CONV_IDTONAME:
 690                 idtonameres(im);
 691                 if (verbose > 1)
 692                         idmapd_warnx("%s %s: (%s) id \"%d\" -> name \"%s\"",
 693                             ic->ic_id, ic->ic_clid,
 694                             im->im_type == IDMAP_TYPE_USER ? "user" : "group",
 695                             im->im_id, im->im_name);
 696                 break;
 697         case IDMAP_CONV_NAMETOID:
 698                 if (validateascii(im->im_name, sizeof(im->im_name)) == -1) {
 699                         im->im_status |= IDMAP_STATUS_INVALIDMSG;
 700                         return;
 701                 }
 702                 nametoidres(im);
 703                 if (verbose > 1)
 704                         idmapd_warnx("%s %s: (%s) name \"%s\" -> id \"%d\"",
 705                             ic->ic_id, ic->ic_clid,
 706                             im->im_type == IDMAP_TYPE_USER ? "user" : "group",
 707                             im->im_name, im->im_id);
 708                 break;
 709         default:
 710                 idmapd_warnx("imconv: Invalid conversion type (%d) in message",
 711                              im->im_conv);
 712                 im->im_status |= IDMAP_STATUS_INVALIDMSG;
 713                 break;
 714         }
 715 }
 716
 717 static void
 718 nfscb(int fd, short which, void *data)
 719 {
 720         struct idmap_client *ic = data;
 721         struct idmap_msg im;
 722
 723         if (which != EV_READ)
 724                 goto out;
 725
 726         if (atomicio(read, ic->ic_fd, &im, sizeof(im)) != sizeof(im)) {
 727                 if (verbose > 0)
 728                         idmapd_warn("nfscb: read(%s)", ic->ic_path);
 729                 if (errno == EPIPE)
 730                         return;
 731                 goto out;
 732         }
 733
 734         imconv(ic, &im);
 735
 736         /* XXX: I don't like ignoring this error in the id->name case,
 737          * but we've never returned it, and I need to check that the client
 738          * can handle it gracefully before starting to return it now. */
 739
 740         if (im.im_status == IDMAP_STATUS_LOOKUPFAIL)
 741                 im.im_status = IDMAP_STATUS_SUCCESS;
 742
 743         if (atomicio(write, ic->ic_fd, &im, sizeof(im)) != sizeof(im))
 744                 idmapd_warn("nfscb: write(%s)", ic->ic_path);
 745 out:
 746         event_add(&ic->ic_event, NULL);
 747 }
 748
 749 static void
 750 nfsdreopen_one(struct idmap_client *ic)
 751 {
 752         int fd;
 753
 754         if (verbose > 0)
 755                 idmapd_warnx("ReOpening %s", ic->ic_path);
 756
 757         if ((fd = open(ic->ic_path, O_RDWR, 0)) != -1) {
 758                 if ((ic->ic_event.ev_flags & EVLIST_INIT))
 759                         event_del(&ic->ic_event);
 760                 if (ic->ic_fd != -1)
 761                         close(ic->ic_fd);
 762
 763                 ic->ic_event.ev_fd = ic->ic_fd = fd;
 764                 event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfsdcb, ic);
 765                 event_add(&ic->ic_event, NULL);
 766         } else {
 767                 idmapd_warnx("nfsdreopen: Opening '%s' failed: errno %d (%s)",
 768                         ic->ic_path, errno, strerror(errno));
 769         }
 770 }
 771
 772 static void
 773 nfsdreopen()
 774 {
 775         nfsdreopen_one(&nfsd_ic[IC_NAMEID]);
 776         nfsdreopen_one(&nfsd_ic[IC_IDNAME]);
 777         return;
 778 }
 779
 780 static int
 781 nfsdopen()
 782 {
 783         return ((nfsdopenone(&nfsd_ic[IC_NAMEID]) == 0 &&
 784                     nfsdopenone(&nfsd_ic[IC_IDNAME]) == 0) ? 0 : -1);
 785 }
 786
 787 static int
 788 nfsdopenone(struct idmap_client *ic)
 789 {
 790         if ((ic->ic_fd = open(ic->ic_path, O_RDWR, 0)) == -1) {
 791                 if (verbose > 0)
 792                         idmapd_warnx("nfsdopenone: Opening %s failed: "
 793                                 "errno %d (%s)",
 794                                 ic->ic_path, errno, strerror(errno));
 795                 return (-1);
 796         }
 797
 798         event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfsdcb, ic);
 799         event_add(&ic->ic_event, NULL);
 800
 801         if (verbose > 0)
 802                 idmapd_warnx("Opened %s", ic->ic_path);
 803
 804         return (0);
 805 }
 806
 807 static int
 808 nfsopen(struct idmap_client *ic)
 809 {
 810         if ((ic->ic_fd = open(ic->ic_path, O_RDWR, 0)) == -1) {
 811                 switch (errno) {
 812                 case ENOENT:
 813                         fcntl(ic->ic_dirfd, F_SETSIG, SIGUSR2);
 814                         fcntl(ic->ic_dirfd, F_NOTIFY,
 815                             DN_CREATE | DN_DELETE | DN_MULTISHOT);
 816                         break;
 817                 default:
 818                         idmapd_warn("nfsopen: open(%s)", ic->ic_path);
 819                         return (-1);
 820                 }
 821         } else {
 822                 event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfscb, ic);
 823                 event_add(&ic->ic_event, NULL);
 824                 fcntl(ic->ic_dirfd, F_SETSIG, 0);
 825                 fcntl(ic->ic_dirfd, F_NOTIFY, 0);
 826                 if (verbose > 0)
 827                         idmapd_warnx("Opened %s", ic->ic_path);
 828         }
 829
 830         return (0);
 831 }
 832
 833 static void
 834 idtonameres(struct idmap_msg *im)
 835 {
 836         char domain[NFS4_MAX_DOMAIN_LEN];
 837         int ret = 0;
 838
 839         ret = nfs4_get_default_domain(NULL, domain, sizeof(domain));
 840         switch (im->im_type) {
 841         case IDMAP_TYPE_USER:
 842                 ret = nfs4_uid_to_name(im->im_id, domain, im->im_name,
 843                                 sizeof(im->im_name));
 844                 if (ret) {
 845                         if (strlen(nobodyuser) < sizeof(im->im_name))
 846                                 strcpy(im->im_name, nobodyuser);
 847                         else
 848                                 strcpy(im->im_name, NFS4NOBODY_USER);
 849                 }
 850                 break;
 851         case IDMAP_TYPE_GROUP:
 852                 ret = nfs4_gid_to_name(im->im_id, domain, im->im_name,
 853                                 sizeof(im->im_name));
 854                 if (ret) {
 855                         if (strlen(nobodygroup) < sizeof(im->im_name))
 856                                 strcpy(im->im_name, nobodygroup);
 857                         else
 858                                 strcpy(im->im_name, NFS4NOBODY_GROUP);
 859                 }
 860                 break;
 861         }
 862         if (ret)
 863                 im->im_status = IDMAP_STATUS_LOOKUPFAIL;
 864         else
 865                 im->im_status = IDMAP_STATUS_SUCCESS;
 866 }
 867
 868 static void
 869 nametoidres(struct idmap_msg *im)
 870 {
 871         uid_t uid;
 872         gid_t gid;
 873         int ret = 0;
 874
 875         /* XXX: move nobody stuff to library calls
 876          * (nfs4_get_nobody_user(domain), nfs4_get_nobody_group(domain)) */
 877
 878         im->im_status = IDMAP_STATUS_SUCCESS;
 879
 880         switch (im->im_type) {
 881         case IDMAP_TYPE_USER:
 882                 ret = nfs4_name_to_uid(im->im_name, &uid);
 883                 im->im_id = (u_int32_t) uid;
 884                 if (ret) {
 885                         im->im_status = IDMAP_STATUS_LOOKUPFAIL;
 886                         im->im_id = nobodyuid;
 887                 }
 888                 return;
 889         case IDMAP_TYPE_GROUP:
 890                 ret = nfs4_name_to_gid(im->im_name, &gid);
 891                 im->im_id = (u_int32_t) gid;
 892                 if (ret) {
 893                         im->im_status = IDMAP_STATUS_LOOKUPFAIL;
 894                         im->im_id = nobodygid;
 895                 }
 896                 return;
 897         }
 898 }
 899
 900 static int
 901 validateascii(char *string, u_int32_t len)
 902 {
 903         int i;
 904
 905         for (i = 0; i < len; i++) {
 906                 if (string[i] == '\0')
 907                         break;
 908
 909                 if (string[i] & 0x80)
 910                         return (-1);
 911         }
 912
 913         if (string[i] != '\0')
 914                 return (-1);
 915
 916         return (i + 1);
 917 }
 918
 919 static int
 920 addfield(char **bpp, ssize_t *bsizp, char *fld)
 921 {
 922         char ch, *bp = *bpp;
 923         ssize_t bsiz = *bsizp;
 924
 925         while ((ch = *fld++) != '\0' && bsiz > 0) {
 926                 switch(ch) {
 927                 case ' ':
 928                 case '\t':
 929                 case '\n':
 930                 case '\\':
 931                         if (bsiz >= 4) {
 932                                 bp += snprintf(bp, bsiz, "\\%03o", ch);
 933                                 bsiz -= 4;
 934                         }
 935                         break;
 936                 default:
 937                         *bp++ = ch;
 938                         bsiz--;
 939                         break;
 940                 }
 941         }
 942
 943         if (bsiz < 1 || ch != '\0')
 944                 return (-1);
 945
 946         *bp++ = ' ';
 947         bsiz--;
 948
 949         *bpp = bp;
 950         *bsizp = bsiz;
 951
 952         return (0);
 953 }
 954
 955 static int
 956 getfield(char **bpp, char *fld, size_t fldsz)
 957 {
 958         char *bp;
 959         u_int val, n;
 960
 961         while ((bp = strsep(bpp, " ")) != NULL && bp[0] == '\0')
 962                 ;
 963
 964         if (bp == NULL || bp[0] == '\0' || bp[0] == '\n')
 965                 return (-1);
 966
 967         while (*bp != '\0' && fldsz > 1) {
 968                 if (*bp == '\\') {
 969                         if ((n = sscanf(bp, "\\%03o", &val)) != 1)
 970                                 return (-1);
 971                         if (val > (char)-1)
 972                                 return (-1);
 973                         *fld++ = (char)val;
 974                         bp += 4;
 975                 } else {
 976                         *fld++ = *bp;
 977                         bp++;
 978                 }
 979                 fldsz--;
 980         }
 981
 982         if (*bp != '\0')
 983                 return (-1);
 984         *fld = '\0';
 985
 986         return (0);
 987 }
 988 /*
 989  * mydaemon creates a pipe between the partent and child
 990  * process. The parent process will wait until the
 991  * child dies or writes a '1' on the pipe signaling
 992  * that it started successfully.
 993  */
 994 int pipefds[2] = { -1, -1};
 995
 996 void
 997 mydaemon(int nochdir, int noclose)
 998 {
 999         int pid, status, tempfd;
1000
1001         if (pipe(pipefds) < 0)
1002                 err(1, "mydaemon: pipe() failed: errno %d", errno);
1003
1004         if ((pid = fork ()) < 0)
1005                 err(1, "mydaemon: fork() failed: errno %d", errno);
1006
1007         if (pid != 0) {
1008                 /*
1009                  * Parent. Wait for status from child.
1010                  */
1011                 close(pipefds[1]);
1012                 if (read(pipefds[0], &status, 1) != 1)
1013                         exit(1);
1014                 exit (0);
1015         }
1016         /* Child.       */
1017         close(pipefds[0]);
1018         setsid ();
1019         if (nochdir == 0) {
1020                 if (chdir ("/") == -1)
1021                         err(1, "mydaemon: chdir() failed: errno %d", errno);
1022         }
1023
1024         while (pipefds[1] <= 2) {
1025                 pipefds[1] = dup(pipefds[1]);
1026                 if (pipefds[1] < 0)
1027                         err(1, "mydaemon: dup() failed: errno %d", errno);
1028         }
1029
1030         if (noclose == 0) {
1031                 tempfd = open("/dev/null", O_RDWR);
1032                 if (tempfd < 0)
1033                         tempfd = open("/", O_RDONLY);
1034                 if (tempfd >= 0) {
1035                         dup2(tempfd, 0);
1036                         dup2(tempfd, 1);
1037                         dup2(tempfd, 2);
1038                         closeall(3);
1039                 } else
1040                         closeall(0);
1041         }
1042
1043         return;
1044 }
1045 void
1046 release_parent()
1047 {
1048         int status;
1049
1050         if (pipefds[1] > 0) {
1051                 write(pipefds[1], &status, 1);
1052                 close(pipefds[1]);
1053                 pipefds[1] = -1;
1054         }
1055 }