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                                 return;
 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                                 return;
 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                                 return;
 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         return;
 516 }
 517
 518 static void
 519 svrreopen(int fd, short which, void *data)
 520 {
 521         nfsdreopen();
 522 }
 523
 524 static void
 525 clntscancb(int fd, short which, void *data)
 526 {
 527         struct idmap_clientq *icq = data;
 528         struct idmap_client *ic;
 529
 530         TAILQ_FOREACH(ic, icq, ic_next)
 531                 if (ic->ic_fd == -1 && nfsopen(ic) == -1) {
 532                         close(ic->ic_dirfd);
 533                         TAILQ_REMOVE(icq, ic, ic_next);
 534                         free(ic);
 535                 }
 536 }
 537
 538 static void
 539 nfsdcb(int fd, short which, void *data)
 540 {
 541         struct idmap_client *ic = data;
 542         struct idmap_msg im;
 543         u_char buf[IDMAP_MAXMSGSZ + 1];
 544         size_t len, bsiz;
 545         char *bp, typebuf[IDMAP_MAXMSGSZ],
 546                 buf1[IDMAP_MAXMSGSZ], authbuf[IDMAP_MAXMSGSZ], *p;
 547         unsigned long tmp;
 548
 549         if (which != EV_READ)
 550                 goto out;
 551
 552         if ((len = read(ic->ic_fd, buf, sizeof(buf))) <= 0) {
 553                 idmapd_warnx("nfsdcb: read(%s) failed: errno %d (%s)",
 554                              ic->ic_path, len?errno:0,
 555                              len?strerror(errno):"End of File");
 556                 goto out;
 557         }
 558
 559         /* Get rid of newline and terminate buffer*/
 560         buf[len - 1] = '\0';
 561         bp = buf;
 562
 563         memset(&im, 0, sizeof(im));
 564
 565         /* Authentication name -- ignored for now*/
 566         if (getfield(&bp, authbuf, sizeof(authbuf)) == -1) {
 567                 idmapd_warnx("nfsdcb: bad authentication name in upcall\n");
 568                 return;
 569         }
 570         if (getfield(&bp, typebuf, sizeof(typebuf)) == -1) {
 571                 idmapd_warnx("nfsdcb: bad type in upcall\n");
 572                 return;
 573         }
 574         if (verbose > 0)
 575                 idmapd_warnx("nfsdcb: authbuf=%s authtype=%s",
 576                              authbuf, typebuf);
 577
 578         im.im_type = strcmp(typebuf, "user") == 0 ?
 579                 IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
 580
 581         switch (ic->ic_which) {
 582         case IC_NAMEID:
 583                 im.im_conv = IDMAP_CONV_NAMETOID;
 584                 if (getfield(&bp, im.im_name, sizeof(im.im_name)) == -1) {
 585                         idmapd_warnx("nfsdcb: bad name in upcall\n");
 586                         return;
 587                 }
 588                 break;
 589         case IC_IDNAME:
 590                 im.im_conv = IDMAP_CONV_IDTONAME;
 591                 if (getfield(&bp, buf1, sizeof(buf1)) == -1) {
 592                         idmapd_warnx("nfsdcb: bad id in upcall\n");
 593                         return;
 594                 }
 595                 tmp = strtoul(buf1, (char **)NULL, 10);
 596                 im.im_id = (u_int32_t)tmp;
 597                 if ((tmp == ULONG_MAX && errno == ERANGE)
 598                                 || (unsigned long)im.im_id != tmp) {
 599                         idmapd_warnx("nfsdcb: id '%s' too big!\n", buf1);
 600                         return;
 601                 }
 602                 break;
 603         default:
 604                 idmapd_warnx("nfsdcb: Unknown which type %d", ic->ic_which);
 605                 return;
 606         }
 607
 608         imconv(ic, &im);
 609
 610         buf[0] = '\0';
 611         bp = buf;
 612         bsiz = sizeof(buf);
 613
 614         /* Authentication name */
 615         addfield(&bp, &bsiz, authbuf);
 616
 617         switch (ic->ic_which) {
 618         case IC_NAMEID:
 619                 /* Type */
 620                 p = im.im_type == IDMAP_TYPE_USER ? "user" : "group";
 621                 addfield(&bp, &bsiz, p);
 622                 /* Name */
 623                 addfield(&bp, &bsiz, im.im_name);
 624                 /* expiry */
 625                 snprintf(buf1, sizeof(buf1), "%lu",
 626                          time(NULL) + cache_entry_expiration);
 627                 addfield(&bp, &bsiz, buf1);
 628                 /* ID */
 629                 snprintf(buf1, sizeof(buf1), "%u", im.im_id);
 630                 addfield(&bp, &bsiz, buf1);
 631
 632                 //if (bsiz == sizeof(buf)) /* XXX */
 633
 634                 bp[-1] = '\n';
 635
 636                 break;
 637         case IC_IDNAME:
 638                 /* Type */
 639                 p = im.im_type == IDMAP_TYPE_USER ? "user" : "group";
 640                 addfield(&bp, &bsiz, p);
 641                 /* ID */
 642                 snprintf(buf1, sizeof(buf1), "%u", im.im_id);
 643                 addfield(&bp, &bsiz, buf1);
 644                 /* expiry */
 645                 snprintf(buf1, sizeof(buf1), "%lu",
 646                          time(NULL) + cache_entry_expiration);
 647                 addfield(&bp, &bsiz, buf1);
 648                 /* Name */
 649                 addfield(&bp, &bsiz, im.im_name);
 650
 651                 bp[-1] = '\n';
 652
 653                 break;
 654         default:
 655                 idmapd_warnx("nfsdcb: Unknown which type %d", ic->ic_which);
 656                 return;
 657         }
 658
 659         bsiz = sizeof(buf) - bsiz;
 660
 661         if (atomicio(write, ic->ic_fd, buf, bsiz) != bsiz)
 662                 idmapd_warnx("nfsdcb: write(%s) failed: errno %d (%s)",
 663                              ic->ic_path, errno, strerror(errno));
 664
 665 out:
 666         event_add(&ic->ic_event, NULL);
 667 }
 668
 669 static void
 670 imconv(struct idmap_client *ic, struct idmap_msg *im)
 671 {
 672         switch (im->im_conv) {
 673         case IDMAP_CONV_IDTONAME:
 674                 idtonameres(im);
 675                 if (verbose > 1)
 676                         idmapd_warnx("%s %s: (%s) id \"%d\" -> name \"%s\"",
 677                             ic->ic_id, ic->ic_clid,
 678                             im->im_type == IDMAP_TYPE_USER ? "user" : "group",
 679                             im->im_id, im->im_name);
 680                 break;
 681         case IDMAP_CONV_NAMETOID:
 682                 if (validateascii(im->im_name, sizeof(im->im_name)) == -1) {
 683                         im->im_status |= IDMAP_STATUS_INVALIDMSG;
 684                         return;
 685                 }
 686                 nametoidres(im);
 687                 if (verbose > 1)
 688                         idmapd_warnx("%s %s: (%s) name \"%s\" -> id \"%d\"",
 689                             ic->ic_id, ic->ic_clid,
 690                             im->im_type == IDMAP_TYPE_USER ? "user" : "group",
 691                             im->im_name, im->im_id);
 692                 break;
 693         default:
 694                 idmapd_warnx("imconv: Invalid conversion type (%d) in message",
 695                              im->im_conv);
 696                 im->im_status |= IDMAP_STATUS_INVALIDMSG;
 697                 break;
 698         }
 699 }
 700
 701 static void
 702 nfscb(int fd, short which, void *data)
 703 {
 704         struct idmap_client *ic = data;
 705         struct idmap_msg im;
 706
 707         if (which != EV_READ)
 708                 goto out;
 709
 710         if (atomicio(read, ic->ic_fd, &im, sizeof(im)) != sizeof(im)) {
 711                 if (verbose > 0)
 712                         idmapd_warn("nfscb: read(%s)", ic->ic_path);
 713                 if (errno == EPIPE)
 714                         return;
 715                 goto out;
 716         }
 717
 718         imconv(ic, &im);
 719
 720         if (atomicio(write, ic->ic_fd, &im, sizeof(im)) != sizeof(im))
 721                 idmapd_warn("nfscb: write(%s)", ic->ic_path);
 722 out:
 723         event_add(&ic->ic_event, NULL);
 724 }
 725
 726 static void
 727 nfsdreopen_one(struct idmap_client *ic)
 728 {
 729         int fd;
 730
 731         if (verbose > 0)
 732                 idmapd_warnx("ReOpening %s", ic->ic_path);
 733
 734         if ((fd = open(ic->ic_path, O_RDWR, 0)) != -1) {
 735                 if ((ic->ic_event.ev_flags & EVLIST_INIT))
 736                         event_del(&ic->ic_event);
 737                 if (ic->ic_fd != -1)
 738                         close(ic->ic_fd);
 739
 740                 ic->ic_event.ev_fd = ic->ic_fd = fd;
 741                 event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfsdcb, ic);
 742                 event_add(&ic->ic_event, NULL);
 743         } else {
 744                 idmapd_warnx("nfsdreopen: Opening '%s' failed: errno %d (%s)",
 745                         ic->ic_path, errno, strerror(errno));
 746         }
 747 }
 748
 749 static void
 750 nfsdreopen()
 751 {
 752         nfsdreopen_one(&nfsd_ic[IC_NAMEID]);
 753         nfsdreopen_one(&nfsd_ic[IC_IDNAME]);
 754         return;
 755 }
 756
 757 static int
 758 nfsdopen()
 759 {
 760         return ((nfsdopenone(&nfsd_ic[IC_NAMEID]) == 0 &&
 761                     nfsdopenone(&nfsd_ic[IC_IDNAME]) == 0) ? 0 : -1);
 762 }
 763
 764 static int
 765 nfsdopenone(struct idmap_client *ic)
 766 {
 767         if ((ic->ic_fd = open(ic->ic_path, O_RDWR, 0)) == -1) {
 768                 if (verbose > 0)
 769                         idmapd_warnx("nfsdopenone: Opening %s failed: "
 770                                 "errno %d (%s)",
 771                                 ic->ic_path, errno, strerror(errno));
 772                 return (-1);
 773         }
 774
 775         event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfsdcb, ic);
 776         event_add(&ic->ic_event, NULL);
 777
 778         if (verbose > 0)
 779                 idmapd_warnx("Opened %s", ic->ic_path);
 780
 781         return (0);
 782 }
 783
 784 static int
 785 nfsopen(struct idmap_client *ic)
 786 {
 787         if ((ic->ic_fd = open(ic->ic_path, O_RDWR, 0)) == -1) {
 788                 switch (errno) {
 789                 case ENOENT:
 790                         fcntl(ic->ic_dirfd, F_SETSIG, SIGUSR2);
 791                         fcntl(ic->ic_dirfd, F_NOTIFY,
 792                             DN_CREATE | DN_DELETE | DN_MULTISHOT);
 793                         break;
 794                 default:
 795                         idmapd_warn("nfsopen: open(%s)", ic->ic_path);
 796                         return (-1);
 797                 }
 798         } else {
 799                 event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfscb, ic);
 800                 event_add(&ic->ic_event, NULL);
 801                 fcntl(ic->ic_dirfd, F_SETSIG, 0);
 802                 fcntl(ic->ic_dirfd, F_NOTIFY, 0);
 803                 if (verbose > 0)
 804                         idmapd_warnx("Opened %s", ic->ic_path);
 805         }
 806
 807         return (0);
 808 }
 809
 810 static void
 811 idtonameres(struct idmap_msg *im)
 812 {
 813         char domain[NFS4_MAX_DOMAIN_LEN];
 814         int ret = 0;
 815
 816         ret = nfs4_get_default_domain(NULL, domain, sizeof(domain));
 817         switch (im->im_type) {
 818         case IDMAP_TYPE_USER:
 819                 ret = nfs4_uid_to_name(im->im_id, domain, im->im_name,
 820                                 sizeof(im->im_name));
 821                 if (ret) {
 822                         if (strlen(nobodyuser) < sizeof(im->im_name))
 823                                 strcpy(im->im_name, nobodyuser);
 824                         else
 825                                 strcpy(im->im_name, NFS4NOBODY_USER);
 826                 }
 827                 break;
 828         case IDMAP_TYPE_GROUP:
 829                 ret = nfs4_gid_to_name(im->im_id, domain, im->im_name,
 830                                 sizeof(im->im_name));
 831                 if (ret) {
 832                         if (strlen(nobodygroup) < sizeof(im->im_name))
 833                                 strcpy(im->im_name, nobodygroup);
 834                         else
 835                                 strcpy(im->im_name, NFS4NOBODY_GROUP);
 836                 }
 837                 break;
 838         }
 839         /* XXX Hack? */
 840         im->im_status = IDMAP_STATUS_SUCCESS;
 841 }
 842
 843 static void
 844 nametoidres(struct idmap_msg *im)
 845 {
 846         uid_t uid;
 847         gid_t gid;
 848         int ret = 0;
 849
 850         /* XXX: nobody fallbacks shouldn't always happen:
 851          *      server id -> name should be OK
 852          *      client name -> id should be OK
 853          * but not otherwise */
 854         /* XXX: move nobody stuff to library calls
 855          * (nfs4_get_nobody_user(domain), nfs4_get_nobody_group(domain)) */
 856         /* XXX: should make this call higher up in the call chain (so we'd
 857          * have a chance on looking up server/whatever. */
 858         switch (im->im_type) {
 859         case IDMAP_TYPE_USER:
 860                 ret = nfs4_name_to_uid(im->im_name, &uid);
 861                 im->im_id = (u_int32_t) uid;
 862                 if (ret)
 863                         im->im_id = nobodyuid;
 864                 break;
 865         case IDMAP_TYPE_GROUP:
 866                 ret = nfs4_name_to_gid(im->im_name, &gid);
 867                 im->im_id = (u_int32_t) gid;
 868                 if (ret)
 869                         im->im_id = nobodygid;
 870                 break;
 871         }
 872         /* XXX? */
 873         im->im_status = IDMAP_STATUS_SUCCESS;
 874 }
 875
 876 static int
 877 validateascii(char *string, u_int32_t len)
 878 {
 879         int i;
 880
 881         for (i = 0; i < len; i++) {
 882                 if (string[i] == '\0')
 883                         break;
 884
 885                 if (string[i] & 0x80)
 886                         return (-1);
 887         }
 888
 889         if (string[i] != '\0')
 890                 return (-1);
 891
 892         return (i + 1);
 893 }
 894
 895 static int
 896 addfield(char **bpp, ssize_t *bsizp, char *fld)
 897 {
 898         char ch, *bp = *bpp;
 899         ssize_t bsiz = *bsizp;
 900
 901         while ((ch = *fld++) != '\0' && bsiz > 0) {
 902                 switch(ch) {
 903                 case ' ':
 904                 case '\t':
 905                 case '\n':
 906                 case '\\':
 907                         if (bsiz >= 4) {
 908                                 bp += snprintf(bp, bsiz, "\\%03o", ch);
 909                                 bsiz -= 4;
 910                         }
 911                         break;
 912                 default:
 913                         *bp++ = ch;
 914                         bsiz--;
 915                         break;
 916                 }
 917         }
 918
 919         if (bsiz < 1 || ch != '\0')
 920                 return (-1);
 921
 922         *bp++ = ' ';
 923         bsiz--;
 924
 925         *bpp = bp;
 926         *bsizp = bsiz;
 927
 928         return (0);
 929 }
 930
 931 static int
 932 getfield(char **bpp, char *fld, size_t fldsz)
 933 {
 934         char *bp;
 935         u_int val, n;
 936
 937         while ((bp = strsep(bpp, " ")) != NULL && bp[0] == '\0')
 938                 ;
 939
 940         if (bp == NULL || bp[0] == '\0' || bp[0] == '\n')
 941                 return (-1);
 942
 943         while (*bp != '\0' && fldsz > 1) {
 944                 if (*bp == '\\') {
 945                         if ((n = sscanf(bp, "\\%03o", &val)) != 1)
 946                                 return (-1);
 947                         if (val > (char)-1)
 948                                 return (-1);
 949                         *fld++ = (char)val;
 950                         bp += 4;
 951                 } else {
 952                         *fld++ = *bp;
 953                         bp++;
 954                 }
 955                 fldsz--;
 956         }
 957
 958         if (*bp != '\0')
 959                 return (-1);
 960         *fld = '\0';
 961
 962         return (0);
 963 }
 964 /*
 965  * mydaemon creates a pipe between the partent and child
 966  * process. The parent process will wait until the
 967  * child dies or writes a '1' on the pipe signaling
 968  * that it started successfully.
 969  */
 970 int pipefds[2] = { -1, -1};
 971
 972 void
 973 mydaemon(int nochdir, int noclose)
 974 {
 975         int pid, status, tempfd;
 976
 977         if (pipe(pipefds) < 0)
 978                 err(1, "mydaemon: pipe() failed: errno %d", errno);
 979
 980         if ((pid = fork ()) < 0)
 981                 err(1, "mydaemon: fork() failed: errno %d", errno);
 982
 983         if (pid != 0) {
 984                 /*
 985                  * Parent. Wait for status from child.
 986                  */
 987                 close(pipefds[1]);
 988                 if (read(pipefds[0], &status, 1) != 1)
 989                         exit(1);
 990                 exit (0);
 991         }
 992         /* Child.       */
 993         close(pipefds[0]);
 994         setsid ();
 995         if (nochdir == 0) {
 996                 if (chdir ("/") == -1)
 997                         err(1, "mydaemon: chdir() failed: errno %d", errno);
 998         }
 999
1000         while (pipefds[1] <= 2) {
1001                 pipefds[1] = dup(pipefds[1]);
1002                 if (pipefds[1] < 0)
1003                         err(1, "mydaemon: dup() failed: errno %d", errno);
1004         }
1005
1006         if (noclose == 0) {
1007                 tempfd = open("/dev/null", O_RDWR);
1008                 dup2(tempfd, 0);
1009                 dup2(tempfd, 1);
1010                 dup2(tempfd, 2);
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 }