2006-04-10 NeilBrown <neilb@suse.de>
[nfs-utils.git] / 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                 dup2(tempfd, 0);
1007                 dup2(tempfd, 1);
1008                 dup2(tempfd, 2);
1009                 closeall(3);
1010         }
1011
1012         return;
1013 }
1014 void
1015 release_parent()
1016 {
1017         int status;
1018
1019         if (pipefds[1] > 0) {
1020                 write(pipefds[1], &status, 1);
1021                 close(pipefds[1]);
1022                 pipefds[1] = -1;
1023         }
1024 }