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))) <= 0) {
 551                 idmapd_warnx("nfsdcb: read(%s) failed: errno %d (%s)",
 552                              ic->ic_path, len?errno:0,
 553                              len?strerror(errno):"End of File");
 554                 goto out;
 555         }
 556
 557         /* Get rid of newline and terminate buffer*/
 558         buf[len - 1] = '\0';
 559         bp = buf;
 560
 561         memset(&im, 0, sizeof(im));
 562
 563         /* Authentication name -- ignored for now*/
 564         if (getfield(&bp, authbuf, sizeof(authbuf)) == -1) {
 565                 idmapd_warnx("nfsdcb: bad authentication name in upcall\n");
 566                 return;
 567         }
 568         if (getfield(&bp, typebuf, sizeof(typebuf)) == -1) {
 569                 idmapd_warnx("nfsdcb: bad type in upcall\n");
 570                 return;
 571         }
 572         if (verbose > 0)
 573                 idmapd_warnx("nfsdcb: authbuf=%s authtype=%s",
 574                              authbuf, typebuf);
 575
 576         im.im_type = strcmp(typebuf, "user") == 0 ?
 577                 IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
 578
 579         switch (ic->ic_which) {
 580         case IC_NAMEID:
 581                 im.im_conv = IDMAP_CONV_NAMETOID;
 582                 if (getfield(&bp, im.im_name, sizeof(im.im_name)) == -1) {
 583                         idmapd_warnx("nfsdcb: bad name in upcall\n");
 584                         return;
 585                 }
 586                 break;
 587         case IC_IDNAME:
 588                 im.im_conv = IDMAP_CONV_IDTONAME;
 589                 if (getfield(&bp, buf1, sizeof(buf1)) == -1) {
 590                         idmapd_warnx("nfsdcb: bad id in upcall\n");
 591                         return;
 592                 }
 593                 tmp = strtoul(buf1, (char **)NULL, 10);
 594                 im.im_id = (u_int32_t)tmp;
 595                 if ((tmp == ULONG_MAX && errno == ERANGE)
 596                                 || (unsigned long)im.im_id != tmp) {
 597                         idmapd_warnx("nfsdcb: id '%s' too big!\n", buf1);
 598                         return;
 599                 }
 600                 break;
 601         default:
 602                 idmapd_warnx("nfsdcb: Unknown which type %d", ic->ic_which);
 603                 return;
 604         }
 605
 606         imconv(ic, &im);
 607
 608         buf[0] = '\0';
 609         bp = buf;
 610         bsiz = sizeof(buf);
 611
 612         /* Authentication name */
 613         addfield(&bp, &bsiz, authbuf);
 614
 615         switch (ic->ic_which) {
 616         case IC_NAMEID:
 617                 /* Type */
 618                 p = im.im_type == IDMAP_TYPE_USER ? "user" : "group";
 619                 addfield(&bp, &bsiz, p);
 620                 /* Name */
 621                 addfield(&bp, &bsiz, im.im_name);
 622                 /* expiry */
 623                 snprintf(buf1, sizeof(buf1), "%lu",
 624                          time(NULL) + cache_entry_expiration);
 625                 addfield(&bp, &bsiz, buf1);
 626                 /* ID */
 627                 snprintf(buf1, sizeof(buf1), "%u", im.im_id);
 628                 addfield(&bp, &bsiz, buf1);
 629
 630                 //if (bsiz == sizeof(buf)) /* XXX */
 631
 632                 bp[-1] = '\n';
 633
 634                 break;
 635         case IC_IDNAME:
 636                 /* Type */
 637                 p = im.im_type == IDMAP_TYPE_USER ? "user" : "group";
 638                 addfield(&bp, &bsiz, p);
 639                 /* ID */
 640                 snprintf(buf1, sizeof(buf1), "%u", im.im_id);
 641                 addfield(&bp, &bsiz, buf1);
 642                 /* expiry */
 643                 snprintf(buf1, sizeof(buf1), "%lu",
 644                          time(NULL) + cache_entry_expiration);
 645                 addfield(&bp, &bsiz, buf1);
 646                 /* Name */
 647                 addfield(&bp, &bsiz, im.im_name);
 648
 649                 bp[-1] = '\n';
 650
 651                 break;
 652         default:
 653                 idmapd_warnx("nfsdcb: Unknown which type %d", ic->ic_which);
 654                 return;
 655         }
 656
 657         bsiz = sizeof(buf) - bsiz;
 658
 659         if (atomicio(write, ic->ic_fd, buf, bsiz) != bsiz)
 660                 idmapd_warnx("nfsdcb: write(%s) failed: errno %d (%s)",
 661                              ic->ic_path, errno, strerror(errno));
 662
 663 out:
 664         event_add(&ic->ic_event, NULL);
 665 }
 666
 667 static void
 668 imconv(struct idmap_client *ic, struct idmap_msg *im)
 669 {
 670         switch (im->im_conv) {
 671         case IDMAP_CONV_IDTONAME:
 672                 idtonameres(im);
 673                 if (verbose > 1)
 674                         idmapd_warnx("%s %s: (%s) id \"%d\" -> name \"%s\"",
 675                             ic->ic_id, ic->ic_clid,
 676                             im->im_type == IDMAP_TYPE_USER ? "user" : "group",
 677                             im->im_id, im->im_name);
 678                 break;
 679         case IDMAP_CONV_NAMETOID:
 680                 if (validateascii(im->im_name, sizeof(im->im_name)) == -1) {
 681                         im->im_status |= IDMAP_STATUS_INVALIDMSG;
 682                         return;
 683                 }
 684                 nametoidres(im);
 685                 if (verbose > 1)
 686                         idmapd_warnx("%s %s: (%s) name \"%s\" -> id \"%d\"",
 687                             ic->ic_id, ic->ic_clid,
 688                             im->im_type == IDMAP_TYPE_USER ? "user" : "group",
 689                             im->im_name, im->im_id);
 690                 break;
 691         default:
 692                 idmapd_warnx("imconv: Invalid conversion type (%d) in message",
 693                              im->im_conv);
 694                 im->im_status |= IDMAP_STATUS_INVALIDMSG;
 695                 break;
 696         }
 697 }
 698
 699 static void
 700 nfscb(int fd, short which, void *data)
 701 {
 702         struct idmap_client *ic = data;
 703         struct idmap_msg im;
 704
 705         if (which != EV_READ)
 706                 goto out;
 707
 708         if (atomicio(read, ic->ic_fd, &im, sizeof(im)) != sizeof(im)) {
 709                 if (verbose > 0)
 710                         idmapd_warn("nfscb: read(%s)", ic->ic_path);
 711                 if (errno == EPIPE)
 712                         return;
 713                 goto out;
 714         }
 715
 716         imconv(ic, &im);
 717
 718         if (atomicio(write, ic->ic_fd, &im, sizeof(im)) != sizeof(im))
 719                 idmapd_warn("nfscb: write(%s)", ic->ic_path);
 720 out:
 721         event_add(&ic->ic_event, NULL);
 722 }
 723
 724 static void
 725 nfsdreopen_one(struct idmap_client *ic)
 726 {
 727         int fd;
 728
 729         if (verbose > 0)
 730                 idmapd_warnx("ReOpening %s", ic->ic_path);
 731
 732         if ((fd = open(ic->ic_path, O_RDWR, 0)) != -1) {
 733                 if ((ic->ic_event.ev_flags & EVLIST_INIT))
 734                         event_del(&ic->ic_event);
 735                 if (ic->ic_fd != -1)
 736                         close(ic->ic_fd);
 737
 738                 ic->ic_event.ev_fd = ic->ic_fd = fd;
 739                 event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfsdcb, ic);
 740                 event_add(&ic->ic_event, NULL);
 741         } else {
 742                 idmapd_warnx("nfsdreopen: Opening '%s' failed: errno %d (%s)",
 743                         ic->ic_path, errno, strerror(errno));
 744         }
 745 }
 746
 747 static void
 748 nfsdreopen()
 749 {
 750         nfsdreopen_one(&nfsd_ic[IC_NAMEID]);
 751         nfsdreopen_one(&nfsd_ic[IC_IDNAME]);
 752         return;
 753 }
 754
 755 static int
 756 nfsdopen()
 757 {
 758         return ((nfsdopenone(&nfsd_ic[IC_NAMEID]) == 0 &&
 759                     nfsdopenone(&nfsd_ic[IC_IDNAME]) == 0) ? 0 : -1);
 760 }
 761
 762 static int
 763 nfsdopenone(struct idmap_client *ic)
 764 {
 765         if ((ic->ic_fd = open(ic->ic_path, O_RDWR, 0)) == -1) {
 766                 if (verbose > 0)
 767                         idmapd_warnx("nfsdopenone: Opening %s failed: "
 768                                 "errno %d (%s)",
 769                                 ic->ic_path, errno, strerror(errno));
 770                 return (-1);
 771         }
 772
 773         event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfsdcb, ic);
 774         event_add(&ic->ic_event, NULL);
 775
 776         if (verbose > 0)
 777                 idmapd_warnx("Opened %s", ic->ic_path);
 778
 779         return (0);
 780 }
 781
 782 static int
 783 nfsopen(struct idmap_client *ic)
 784 {
 785         if ((ic->ic_fd = open(ic->ic_path, O_RDWR, 0)) == -1) {
 786                 switch (errno) {
 787                 case ENOENT:
 788                         fcntl(ic->ic_dirfd, F_SETSIG, SIGUSR2);
 789                         fcntl(ic->ic_dirfd, F_NOTIFY,
 790                             DN_CREATE | DN_DELETE | DN_MULTISHOT);
 791                         break;
 792                 default:
 793                         idmapd_warn("nfsopen: open(%s)", ic->ic_path);
 794                         return (-1);
 795                 }
 796         } else {
 797                 event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfscb, ic);
 798                 event_add(&ic->ic_event, NULL);
 799                 fcntl(ic->ic_dirfd, F_SETSIG, 0);
 800                 fcntl(ic->ic_dirfd, F_NOTIFY, 0);
 801                 if (verbose > 0)
 802                         idmapd_warnx("Opened %s", ic->ic_path);
 803         }
 804
 805         return (0);
 806 }
 807
 808 static void
 809 idtonameres(struct idmap_msg *im)
 810 {
 811         char domain[NFS4_MAX_DOMAIN_LEN];
 812         int ret = 0;
 813
 814         ret = nfs4_get_default_domain(NULL, domain, sizeof(domain));
 815         switch (im->im_type) {
 816         case IDMAP_TYPE_USER:
 817                 ret = nfs4_uid_to_name(im->im_id, domain, im->im_name,
 818                                 sizeof(im->im_name));
 819                 if (ret) {
 820                         if (strlen(nobodyuser) < sizeof(im->im_name))
 821                                 strcpy(im->im_name, nobodyuser);
 822                         else
 823                                 strcpy(im->im_name, NFS4NOBODY_USER);
 824                 }
 825                 break;
 826         case IDMAP_TYPE_GROUP:
 827                 ret = nfs4_gid_to_name(im->im_id, domain, im->im_name,
 828                                 sizeof(im->im_name));
 829                 if (ret) {
 830                         if (strlen(nobodygroup) < sizeof(im->im_name))
 831                                 strcpy(im->im_name, nobodygroup);
 832                         else
 833                                 strcpy(im->im_name, NFS4NOBODY_GROUP);
 834                 }
 835                 break;
 836         }
 837         /* XXX Hack? */
 838         im->im_status = IDMAP_STATUS_SUCCESS;
 839 }
 840
 841 static void
 842 nametoidres(struct idmap_msg *im)
 843 {
 844         uid_t uid;
 845         gid_t gid;
 846         int ret = 0;
 847
 848         /* XXX: nobody fallbacks shouldn't always happen:
 849          *      server id -> name should be OK
 850          *      client name -> id should be OK
 851          * but not otherwise */
 852         /* XXX: move nobody stuff to library calls
 853          * (nfs4_get_nobody_user(domain), nfs4_get_nobody_group(domain)) */
 854         /* XXX: should make this call higher up in the call chain (so we'd
 855          * have a chance on looking up server/whatever. */
 856         switch (im->im_type) {
 857         case IDMAP_TYPE_USER:
 858                 ret = nfs4_name_to_uid(im->im_name, &uid);
 859                 im->im_id = (u_int32_t) uid;
 860                 if (ret)
 861                         im->im_id = nobodyuid;
 862                 break;
 863         case IDMAP_TYPE_GROUP:
 864                 ret = nfs4_name_to_gid(im->im_name, &gid);
 865                 im->im_id = (u_int32_t) gid;
 866                 if (ret)
 867                         im->im_id = nobodygid;
 868                 break;
 869         }
 870         /* XXX? */
 871         im->im_status = IDMAP_STATUS_SUCCESS;
 872 }
 873
 874 static int
 875 validateascii(char *string, u_int32_t len)
 876 {
 877         int i;
 878
 879         for (i = 0; i < len; i++) {
 880                 if (string[i] == '\0')
 881                         break;
 882
 883                 if (string[i] & 0x80)
 884                         return (-1);
 885         }
 886
 887         if (string[i] != '\0')
 888                 return (-1);
 889
 890         return (i + 1);
 891 }
 892
 893 static int
 894 addfield(char **bpp, ssize_t *bsizp, char *fld)
 895 {
 896         char ch, *bp = *bpp;
 897         ssize_t bsiz = *bsizp;
 898
 899         while ((ch = *fld++) != '\0' && bsiz > 0) {
 900                 switch(ch) {
 901                 case ' ':
 902                 case '\t':
 903                 case '\n':
 904                 case '\\':
 905                         if (bsiz >= 4) {
 906                                 bp += snprintf(bp, bsiz, "\\%03o", ch);
 907                                 bsiz -= 4;
 908                         }
 909                         break;
 910                 default:
 911                         *bp++ = ch;
 912                         bsiz--;
 913                         break;
 914                 }
 915         }
 916
 917         if (bsiz < 1 || ch != '\0')
 918                 return (-1);
 919
 920         *bp++ = ' ';
 921         bsiz--;
 922
 923         *bpp = bp;
 924         *bsizp = bsiz;
 925
 926         return (0);
 927 }
 928
 929 static int
 930 getfield(char **bpp, char *fld, size_t fldsz)
 931 {
 932         char *bp;
 933         u_int val, n;
 934
 935         while ((bp = strsep(bpp, " ")) != NULL && bp[0] == '\0')
 936                 ;
 937
 938         if (bp == NULL || bp[0] == '\0' || bp[0] == '\n')
 939                 return (-1);
 940
 941         while (*bp != '\0' && fldsz > 1) {
 942                 if (*bp == '\\') {
 943                         if ((n = sscanf(bp, "\\%03o", &val)) != 1)
 944                                 return (-1);
 945                         if (val > (char)-1)
 946                                 return (-1);
 947                         *fld++ = (char)val;
 948                         bp += 4;
 949                 } else {
 950                         *fld++ = *bp;
 951                         bp++;
 952                 }
 953                 fldsz--;
 954         }
 955
 956         if (*bp != '\0')
 957                 return (-1);
 958         *fld = '\0';
 959
 960         return (0);
 961 }
 962 /*
 963  * mydaemon creates a pipe between the partent and child
 964  * process. The parent process will wait until the
 965  * child dies or writes a '1' on the pipe signaling
 966  * that it started successfully.
 967  */
 968 int pipefds[2] = { -1, -1};
 969
 970 void
 971 mydaemon(int nochdir, int noclose)
 972 {
 973         int pid, status, tempfd;
 974
 975         if (pipe(pipefds) < 0)
 976                 err(1, "mydaemon: pipe() failed: errno %d", errno);
 977
 978         if ((pid = fork ()) < 0)
 979                 err(1, "mydaemon: fork() failed: errno %d", errno);
 980
 981         if (pid != 0) {
 982                 /*
 983                  * Parent. Wait for status from child.
 984                  */
 985                 close(pipefds[1]);
 986                 if (read(pipefds[0], &status, 1) != 1)
 987                         exit(1);
 988                 exit (0);
 989         }
 990         /* Child.       */
 991         close(pipefds[0]);
 992         setsid ();
 993         if (nochdir == 0) {
 994                 if (chdir ("/") == -1)
 995                         err(1, "mydaemon: chdir() failed: errno %d", errno);
 996         }
 997
 998         while (pipefds[1] <= 2) {
 999                 pipefds[1] = dup(pipefds[1]);
1000                 if (pipefds[1] < 0)
1001                         err(1, "mydaemon: dup() failed: errno %d", errno);
1002         }
1003
1004         if (noclose == 0) {
1005                 tempfd = open("/dev/null", O_RDWR);
1006                 if (tempfd >= 0) {
1007                         dup2(tempfd, 0);
1008                         dup2(tempfd, 1);
1009                         dup2(tempfd, 2);
1010                 }
1011                 closeall(3);
1012         }
1013
1014         return;
1015 }
1016 void
1017 release_parent()
1018 {
1019         int status;
1020
1021         if (pipefds[1] > 0) {
1022                 write(pipefds[1], &status, 1);
1023                 close(pipefds[1]);
1024                 pipefds[1] = -1;
1025         }
1026 }