3 * Handle communication with knfsd internal cache
5 * We open /proc/net/rpc/{auth.unix.ip,nfsd.export,nfsd.fh}/channel
6 * and listen for requests (using my_svc_run)
14 #include <sys/types.h>
15 #include <sys/select.h>
19 #include <netinet/in.h>
20 #include <arpa/inet.h>
33 #include "pseudoflavors.h"
36 #include "blkid/blkid.h"
40 * Invoked by RPC service loop
42 void cache_set_fds(fd_set *fdset);
43 int cache_process_req(fd_set *readfds);
57 * Support routines for text-based upcalls.
58 * Fields are separated by spaces.
59 * Fields are either mangled to quote space tab newline slosh with slosh
60 * or a hexified with a leading \x
61 * Record is terminated with newline.
64 static int cache_export_ent(char *domain, struct exportent *exp, char *p);
66 #define INITIAL_MANAGED_GROUPS 100
70 extern int use_ipaddr;
72 static void auth_unix_ip(FILE *f)
76 * Ignore if class != "nfsd"
77 * Otherwise find domainname and write back:
79 * "nfsd" IP-ADDR expiry domainname
83 char ipaddr[INET6_ADDRSTRLEN];
85 struct addrinfo *tmp = NULL;
86 if (readline(fileno(f), &lbuf, &lbuflen) != 1)
89 xlog(D_CALL, "auth_unix_ip: inbuf '%s'", lbuf);
93 if (qword_get(&cp, class, 20) <= 0 ||
94 strcmp(class, "nfsd") != 0)
97 if (qword_get(&cp, ipaddr, sizeof(ipaddr)) <= 0)
100 tmp = host_pton(ipaddr);
106 /* addr is a valid, interesting address, find the domain name... */
108 struct addrinfo *ai = NULL;
110 ai = client_resolve(tmp->ai_addr);
112 client = client_compose(ai);
116 qword_print(f, "nfsd");
117 qword_print(f, ipaddr);
118 qword_printtimefrom(f, DEFAULT_TTL);
120 qword_print(f, ipaddr);
122 qword_print(f, *client?client:"DEFAULT");
124 xlog(D_CALL, "auth_unix_ip: client %p '%s'", client, client?client: "DEFAULT");
131 static void auth_unix_gid(FILE *f)
136 * uid expiry count list of group ids
140 static gid_t *groups = NULL;
141 static int groups_len = 0;
147 if (groups_len == 0) {
148 groups = malloc(sizeof(gid_t) * INITIAL_MANAGED_GROUPS);
152 groups_len = INITIAL_MANAGED_GROUPS;
155 ngroups = groups_len;
157 if (readline(fileno(f), &lbuf, &lbuflen) != 1)
161 if (qword_get_uint(&cp, &uid) != 0)
168 rv = getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
169 if (rv == -1 && ngroups >= groups_len) {
170 more_groups = realloc(groups, sizeof(gid_t)*ngroups);
174 groups = more_groups;
175 groups_len = ngroups;
176 rv = getgrouplist(pw->pw_name, pw->pw_gid,
181 qword_printuint(f, uid);
182 qword_printtimefrom(f, DEFAULT_TTL);
184 qword_printuint(f, ngroups);
185 for (i=0; i<ngroups; i++)
186 qword_printuint(f, groups[i]);
188 qword_printuint(f, 0);
193 static const char *get_uuid_blkdev(char *path)
195 /* We set *safe if we know that we need the
196 * fsid from statfs too.
198 static blkid_cache cache = NULL;
201 blkid_tag_iterate iter;
204 const char *val, *uuid = NULL;
207 blkid_get_cache(&cache, NULL);
209 if (stat(path, &stb) != 0)
211 devname = blkid_devno_to_devname(stb.st_dev);
214 dev = blkid_get_dev(cache, devname, BLKID_DEV_NORMAL);
218 iter = blkid_tag_iterate_begin(dev);
221 while (blkid_tag_next(iter, &type, &val) == 0) {
222 if (strcmp(type, "UUID") == 0)
224 if (strcmp(type, "TYPE") == 0 &&
225 strcmp(val, "btrfs") == 0) {
230 blkid_tag_iterate_end(iter);
234 #define get_uuid_blkdev(path) (NULL)
237 static int get_uuid(const char *val, size_t uuidlen, char *u)
239 /* extract hex digits from uuidstr and compose a uuid
240 * of the given length (max 16), xoring bytes to make
245 memset(u, 0, uuidlen);
246 for ( ; *val ; val++) {
267 static int uuid_by_path(char *path, int type, size_t uuidlen, char *uuid)
269 /* get a uuid for the filesystem found at 'path'.
270 * There are several possible ways of generating the
272 * Type 0 is used for new filehandles, while other types
273 * may be used to interpret old filehandle - to ensure smooth
275 * We return 1 if a uuid was found (and it might be worth
276 * trying the next type) or 0 if no more uuid types can be
280 /* Possible sources of uuid are
284 * On some filesystems (e.g. vfat) the statfs64 uuid is simply an
285 * encoding of the device that the filesystem is mounted from, so
286 * it we be very bad to use that (as device numbers change). blkid
288 * On other filesystems (e.g. btrfs) the statfs64 uuid contains
289 * important info that the blkid uuid cannot contain: This happens
290 * when multiple subvolumes are exported (they have the same
291 * blkid uuid but different statfs64 uuids).
292 * We rely on get_uuid_blkdev *knowing* which is which and not returning
293 * a uuid for filesystems where the statfs64 uuid is better.
298 const char *blkid_val;
301 blkid_val = get_uuid_blkdev(path);
303 if (statfs64(path, &st) == 0 &&
304 (st.f_fsid.__val[0] || st.f_fsid.__val[1]))
305 snprintf(fsid_val, 17, "%08x%08x",
306 st.f_fsid.__val[0], st.f_fsid.__val[1]);
310 if (blkid_val && (type--) == 0)
312 else if (fsid_val[0] && (type--) == 0)
317 get_uuid(val, uuidlen, uuid);
321 /* Iterate through /etc/mtab, finding mountpoints
322 * at or below a given path
324 static char *next_mnt(void **v, char *p)
328 size_t l = strlen(p);
330 f = setmntent("/etc/mtab", "r");
334 while ((me = getmntent(f)) != NULL &&
335 (strncmp(me->mnt_dir, p, l) != 0 ||
336 me->mnt_dir[l] != '/'))
346 static int is_subdirectory(char *child, char *parent)
348 size_t l = strlen(parent);
350 if (strcmp(parent, "/") == 0)
353 return strcmp(child, parent) == 0
354 || (strncmp(child, parent, l) == 0 && child[l] == '/');
357 static int path_matches(nfs_export *exp, char *path)
359 if (exp->m_export.e_flags & NFSEXP_CROSSMOUNT)
360 return is_subdirectory(path, exp->m_export.e_path);
361 return strcmp(path, exp->m_export.e_path) == 0;
365 export_matches(nfs_export *exp, char *dom, char *path, struct addrinfo *ai)
367 return path_matches(exp, path) && client_matches(exp, dom, ai);
370 /* True iff e1 is a child of e2 and e2 has crossmnt set: */
371 static bool subexport(struct exportent *e1, struct exportent *e2)
373 char *p1 = e1->e_path, *p2 = e2->e_path;
374 size_t l2 = strlen(p2);
376 return e2->e_flags & NFSEXP_CROSSMOUNT
377 && strncmp(p1, p2, l2) == 0
383 /* We could use a union for this, but it would be more
384 * complicated; why bother? */
388 unsigned int fsidnum;
393 static int parse_fsid(int fsidtype, int fsidlen, char *fsid,
394 struct parsed_fsid *parsed)
397 unsigned long long inode64;
399 memset(parsed, 0, sizeof(*parsed));
400 parsed->fsidtype = fsidtype;
402 case FSID_DEV: /* 4 bytes: 2 major, 2 minor, 4 inode */
405 memcpy(&dev, fsid, 4);
406 memcpy(&parsed->inode, fsid+4, 4);
407 parsed->major = ntohl(dev)>>16;
408 parsed->minor = ntohl(dev) & 0xFFFF;
411 case FSID_NUM: /* 4 bytes - fsid */
414 memcpy(&parsed->fsidnum, fsid, 4);
417 case FSID_MAJOR_MINOR: /* 12 bytes: 4 major, 4 minor, 4 inode
418 * This format is never actually used but was
419 * an historical accident
423 memcpy(&dev, fsid, 4);
424 parsed->major = ntohl(dev);
425 memcpy(&dev, fsid+4, 4);
426 parsed->minor = ntohl(dev);
427 memcpy(&parsed->inode, fsid+8, 4);
430 case FSID_ENCODE_DEV: /* 8 bytes: 4 byte packed device number, 4 inode */
431 /* This is *host* endian, not net-byte-order, because
432 * no-one outside this host has any business interpreting it
436 memcpy(&dev, fsid, 4);
437 memcpy(&parsed->inode, fsid+4, 4);
438 parsed->major = (dev & 0xfff00) >> 8;
439 parsed->minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
442 case FSID_UUID4_INUM: /* 4 byte inode number and 4 byte uuid */
445 memcpy(&parsed->inode, fsid, 4);
447 parsed->fhuuid = fsid+4;
449 case FSID_UUID8: /* 8 byte uuid */
453 parsed->fhuuid = fsid;
455 case FSID_UUID16: /* 16 byte uuid */
458 parsed->uuidlen = 16;
459 parsed->fhuuid = fsid;
461 case FSID_UUID16_INUM: /* 8 byte inode number and 16 byte uuid */
464 memcpy(&inode64, fsid, 8);
465 parsed->inode = inode64;
466 parsed->uuidlen = 16;
467 parsed->fhuuid = fsid+8;
473 static bool match_fsid(struct parsed_fsid *parsed, nfs_export *exp, char *path)
479 if (stat(path, &stb) != 0)
481 if (!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode))
484 switch (parsed->fsidtype) {
486 case FSID_MAJOR_MINOR:
487 case FSID_ENCODE_DEV:
488 if (stb.st_ino != parsed->inode)
490 if (parsed->major != major(stb.st_dev) ||
491 parsed->minor != minor(stb.st_dev))
495 if (((exp->m_export.e_flags & NFSEXP_FSID) == 0 ||
496 exp->m_export.e_fsid != parsed->fsidnum))
499 case FSID_UUID4_INUM:
500 case FSID_UUID16_INUM:
501 if (stb.st_ino != parsed->inode)
506 if (!is_mountpoint(path))
509 if (exp->m_export.e_uuid)
510 get_uuid(exp->m_export.e_uuid, parsed->uuidlen, u);
513 uuid_by_path(path, type, parsed->uuidlen, u);
515 if (memcmp(u, parsed->fhuuid, parsed->uuidlen) == 0)
518 if (memcmp(u, parsed->fhuuid, parsed->uuidlen) != 0)
522 /* Well, unreachable, actually: */
526 static struct addrinfo *lookup_client_addr(char *dom)
528 struct addrinfo *ret;
529 struct addrinfo *tmp;
531 dom++; /* skip initial "$" */
533 tmp = host_pton(dom);
536 ret = client_resolve(tmp->ai_addr);
541 static void nfsd_fh(FILE *f)
544 * domain fsidtype fsid
545 * interpret fsid, find export point and options, and write:
546 * domain fsidtype fsid expiry path
553 struct parsed_fsid parsed;
554 struct exportent *found = NULL;
555 struct addrinfo *ai = NULL;
556 char *found_path = NULL;
561 if (readline(fileno(f), &lbuf, &lbuflen) != 1)
564 xlog(D_CALL, "nfsd_fh: inbuf '%s'", lbuf);
568 dom = malloc(strlen(cp));
571 if (qword_get(&cp, dom, strlen(cp)) <= 0)
573 if (qword_get_int(&cp, &fsidtype) != 0)
575 if (fsidtype < 0 || fsidtype > 7)
576 goto out; /* unknown type */
577 if ((fsidlen = qword_get(&cp, fsid, 32)) <= 0)
579 if (parse_fsid(fsidtype, fsidlen, fsid, &parsed))
584 if (is_ipaddr_client(dom)) {
585 ai = lookup_client_addr(dom);
590 /* Now determine export point for this fsid/domain */
591 for (i=0 ; i < MCL_MAXTYPES; i++) {
592 nfs_export *next_exp;
593 for (exp = exportlist[i].p_head; exp; exp = next_exp) {
596 if (exp->m_export.e_flags & NFSEXP_CROSSMOUNT) {
597 static nfs_export *prev = NULL;
598 static void *mnt = NULL;
602 path = next_mnt(&mnt, exp->m_export.e_path);
604 next_exp = exp->m_next;
612 path = exp->m_export.e_path;
616 path = exp->m_export.e_path;
617 next_exp = exp->m_next;
620 if (!is_ipaddr_client(dom)
621 && !namelist_client_matches(exp, dom))
623 if (exp->m_export.e_mountpoint &&
624 !is_mountpoint(exp->m_export.e_mountpoint[0]?
625 exp->m_export.e_mountpoint:
626 exp->m_export.e_path))
629 if (!match_fsid(&parsed, exp, path))
631 if (is_ipaddr_client(dom)
632 && !ipaddr_client_matches(exp, ai))
634 if (!found || subexport(&exp->m_export, found)) {
635 found = &exp->m_export;
637 found_path = strdup(path);
638 if (found_path == NULL)
640 } else if (strcmp(found->e_path, exp->m_export.e_path) != 0
641 && !subexport(found, &exp->m_export))
643 xlog(L_WARNING, "%s and %s have same filehandle for %s, using first",
644 found_path, path, dom);
646 /* same path, if one is V4ROOT, choose the other */
647 if (found->e_flags & NFSEXP_V4ROOT) {
648 found = &exp->m_export;
650 found_path = strdup(path);
651 if (found_path == NULL)
658 found->e_mountpoint &&
659 !is_mountpoint(found->e_mountpoint[0]?
662 /* Cannot export this yet
663 * should log a warning, but need to rate limit
664 xlog(L_WARNING, "%s not exported as %d not a mountpoint",
665 found->e_path, found->e_mountpoint);
667 /* FIXME we need to make sure we re-visit this later */
670 if (!found && dev_missing) {
671 /* The missing dev could be what we want, so just be
672 * quite rather than returning stale yet
678 if (cache_export_ent(dom, found, found_path) < 0)
682 qword_printint(f, fsidtype);
683 qword_printhex(f, fsid, fsidlen);
684 /* The fsid -> path lookup can be quite expensive as it
685 * potentially stats and reads lots of devices, and some of those
686 * might have spun-down. The Answer is not likely to
687 * change underneath us, and an 'exportfs -f' can always
688 * remove this from the kernel, so use a really log
689 * timeout. Maybe this should be configurable on the command
692 qword_printint(f, 0x7fffffff);
694 qword_print(f, found_path);
701 xlog(D_CALL, "nfsd_fh: found %p path %s", found, found ? found->e_path : NULL);
705 static void write_fsloc(FILE *f, struct exportent *ep)
707 struct servers *servers;
709 if (ep->e_fslocmethod == FSLOC_NONE)
712 servers = replicas_lookup(ep->e_fslocmethod, ep->e_fslocdata);
715 qword_print(f, "fsloc");
716 qword_printint(f, servers->h_num);
717 if (servers->h_num >= 0) {
719 for (i=0; i<servers->h_num; i++) {
720 qword_print(f, servers->h_mp[i]->h_host);
721 qword_print(f, servers->h_mp[i]->h_path);
724 qword_printint(f, servers->h_referral);
725 release_replicas(servers);
728 static void write_secinfo(FILE *f, struct exportent *ep, int flag_mask)
732 for (p = ep->e_secinfo; p->flav; p++)
734 if (p == ep->e_secinfo) {
735 /* There was no sec= option */
738 qword_print(f, "secinfo");
739 qword_printint(f, p - ep->e_secinfo);
740 for (p = ep->e_secinfo; p->flav; p++) {
741 qword_printint(f, p->flav->fnum);
742 qword_printint(f, p->flags & flag_mask);
747 static int dump_to_cache(FILE *f, char *domain, char *path, struct exportent *exp)
749 qword_print(f, domain);
750 qword_print(f, path);
752 int different_fs = strcmp(path, exp->e_path) != 0;
753 int flag_mask = different_fs ? ~NFSEXP_FSID : ~0;
755 qword_printtimefrom(f, exp->e_ttl);
756 qword_printint(f, exp->e_flags & flag_mask);
757 qword_printint(f, exp->e_anonuid);
758 qword_printint(f, exp->e_anongid);
759 qword_printint(f, exp->e_fsid);
761 write_secinfo(f, exp, flag_mask);
762 if (exp->e_uuid == NULL || different_fs) {
764 if (uuid_by_path(path, 0, 16, u)) {
765 qword_print(f, "uuid");
766 qword_printhex(f, u, 16);
770 get_uuid(exp->e_uuid, 16, u);
771 qword_print(f, "uuid");
772 qword_printhex(f, u, 16);
775 qword_printtimefrom(f, DEFAULT_TTL);
780 lookup_export(char *dom, char *path, struct addrinfo *ai)
783 nfs_export *found = NULL;
787 for (i=0 ; i < MCL_MAXTYPES; i++) {
788 for (exp = exportlist[i].p_head; exp; exp = exp->m_next) {
789 if (!export_matches(exp, dom, path, ai))
796 /* Always prefer non-V4ROOT exports */
797 if (exp->m_export.e_flags & NFSEXP_V4ROOT)
799 if (found->m_export.e_flags & NFSEXP_V4ROOT) {
805 /* If one is a CROSSMOUNT, then prefer the longest path */
806 if (((found->m_export.e_flags & NFSEXP_CROSSMOUNT) ||
807 (exp->m_export.e_flags & NFSEXP_CROSSMOUNT)) &&
808 strlen(found->m_export.e_path) !=
809 strlen(exp->m_export.e_path)) {
811 if (strlen(exp->m_export.e_path) >
812 strlen(found->m_export.e_path)) {
818 } else if (found_type == i && found->m_warned == 0) {
819 xlog(L_WARNING, "%s exported to both %s and %s, "
820 "arbitrarily choosing options from first",
821 path, found->m_client->m_hostname, exp->m_client->m_hostname,
830 #ifdef HAVE_NFS_PLUGIN_H
833 #include <nfs-plugin.h>
836 * Find the export entry for the parent of "pathname".
837 * Caller must not free returned exportent.
839 static struct exportent *lookup_parent_export(char *dom,
840 const char *pathname, struct addrinfo *ai)
842 char *parent, *slash;
845 parent = strdup(pathname);
846 if (parent == NULL) {
847 xlog(D_GENERAL, "%s: failed to allocate parent path buffer",
851 xlog(D_CALL, "%s: pathname = '%s'", __func__, pathname);
854 /* shorten pathname by one component */
855 slash = strrchr(parent, '/');
857 xlog(D_GENERAL, "%s: no slash found in pathname",
863 if (strlen(parent) == 0) {
864 result = lookup_export(dom, "/", ai);
865 if (result == NULL) {
866 xlog(L_ERROR, "%s: no root export found.", __func__);
872 result = lookup_export(dom, parent, ai);
873 if (result == NULL) {
874 xlog(D_GENERAL, "%s: lookup_export(%s) found nothing",
880 xlog(D_CALL, "%s: found export for %s", __func__, parent);
882 return &result->m_export;
886 return mkexportent("*", "/", "insecure");
890 * Walk through a set of FS locations and build an e_fslocdata string.
891 * Returns true if all went to plan; otherwise, false.
893 static bool locations_to_fslocdata(struct jp_ops *ops,
894 nfs_fsloc_set_t locations, char *fslocdata,
895 size_t remaining, int *ttl)
897 char *server, *last_path, *rootpath, *ptr;
907 enum jp_status status;
910 status = ops->jp_get_next_location(locations, &server,
912 if (status == JP_EMPTY)
914 if (status != JP_OK) {
915 xlog(D_GENERAL, "%s: failed to parse location: %s",
916 __func__, ops->jp_error(status));
919 xlog(D_GENERAL, "%s: Location: %s:%s",
920 __func__, server, rootpath);
922 if (last_path && strcmp(rootpath, last_path) == 0) {
923 len = snprintf(ptr, remaining, "+%s", server);
925 xlog(D_GENERAL, "%s: snprintf: %m", __func__);
928 if ((size_t)len >= remaining) {
929 xlog(D_GENERAL, "%s: fslocdata buffer overflow", __func__);
932 remaining -= (size_t)len;
935 if (last_path == NULL)
936 len = snprintf(ptr, remaining, "%s@%s",
939 len = snprintf(ptr, remaining, ":%s@%s",
942 xlog(D_GENERAL, "%s: snprintf: %m", __func__);
945 if ((size_t)len >= remaining) {
946 xlog(D_GENERAL, "%s: fslocdata buffer overflow",
950 remaining -= (size_t)len;
952 last_path = rootpath;
960 xlog(D_CALL, "%s: fslocdata='%s', ttl=%d",
961 __func__, fslocdata, *ttl);
971 * Duplicate the junction's parent's export options and graft in
972 * the fslocdata we constructed from the locations list.
974 static struct exportent *create_junction_exportent(struct exportent *parent,
975 const char *junction, const char *fslocdata, int ttl)
977 static struct exportent *eep;
979 eep = (struct exportent *)malloc(sizeof(*eep));
983 dupexportent(eep, parent);
984 strcpy(eep->e_path, junction);
985 eep->e_hostname = strdup(parent->e_hostname);
986 if (eep->e_hostname == NULL) {
992 eep->e_ttl = (unsigned int)ttl;
994 free(eep->e_fslocdata);
995 eep->e_fslocdata = strdup(fslocdata);
996 if (eep->e_fslocdata == NULL) {
997 free(eep->e_hostname);
1001 eep->e_fslocmethod = FSLOC_REFER;
1005 xlog(L_ERROR, "%s: No memory", __func__);
1010 * Walk through the set of FS locations and build an exportent.
1011 * Returns pointer to an exportent if "junction" refers to a junction.
1013 static struct exportent *locations_to_export(struct jp_ops *ops,
1014 nfs_fsloc_set_t locations, const char *junction,
1015 struct exportent *parent)
1017 static char fslocdata[BUFSIZ];
1020 fslocdata[0] = '\0';
1021 if (!locations_to_fslocdata(ops, locations,
1022 fslocdata, sizeof(fslocdata), &ttl))
1024 return create_junction_exportent(parent, junction, fslocdata, ttl);
1028 * Retrieve locations information in "junction" and dump it to the
1029 * kernel. Returns pointer to an exportent if "junction" refers
1032 static struct exportent *invoke_junction_ops(void *handle, char *dom,
1033 const char *junction, struct addrinfo *ai)
1035 struct exportent *parent, *exp = NULL;
1036 nfs_fsloc_set_t locations;
1037 enum jp_status status;
1041 ops = (struct jp_ops *)dlsym(handle, "nfs_junction_ops");
1043 if (error != NULL) {
1044 xlog(D_GENERAL, "%s: dlsym(jp_junction_ops): %s",
1048 if (ops->jp_api_version != JP_API_VERSION) {
1049 xlog(D_GENERAL, "%s: unrecognized junction API version: %u",
1050 __func__, ops->jp_api_version);
1054 status = ops->jp_init(false);
1055 if (status != JP_OK) {
1056 xlog(D_GENERAL, "%s: failed to resolve %s: %s",
1057 __func__, junction, ops->jp_error(status));
1061 status = ops->jp_get_locations(junction, &locations);
1065 case JP_NOTJUNCTION:
1066 xlog(D_GENERAL, "%s: %s is not a junction",
1067 __func__, junction);
1070 xlog(L_WARNING, "Dangling junction %s: %s",
1071 junction, ops->jp_error(status));
1075 parent = lookup_parent_export(dom, junction, ai);
1079 exp = locations_to_export(ops, locations, junction, parent);
1081 ops->jp_put_locations(locations);
1089 * Load the junction plug-in, then try to resolve "pathname".
1090 * Returns pointer to an initialized exportent if "junction"
1091 * refers to a junction, or NULL if not.
1093 static struct exportent *lookup_junction(char *dom, const char *pathname,
1094 struct addrinfo *ai)
1096 struct exportent *exp;
1097 struct link_map *map;
1100 handle = dlopen("libnfsjunct.so", RTLD_NOW);
1101 if (handle == NULL) {
1102 xlog(D_GENERAL, "%s: dlopen: %s", __func__, dlerror());
1106 if (dlinfo(handle, RTLD_DI_LINKMAP, &map) == 0)
1107 xlog(D_GENERAL, "%s: loaded plug-in %s",
1108 __func__, map->l_name);
1110 (void)dlerror(); /* Clear any error */
1112 exp = invoke_junction_ops(handle, dom, pathname, ai);
1114 /* We could leave it loaded to make junction resolution
1115 * faster next time. However, if we want to replace the
1116 * library, that would require restarting mountd. */
1117 (void)dlclose(handle);
1121 static void lookup_nonexport(FILE *f, char *dom, char *path,
1122 struct addrinfo *ai)
1124 struct exportent *eep;
1126 eep = lookup_junction(dom, path, ai);
1127 dump_to_cache(f, dom, path, eep);
1130 exportent_release(eep);
1133 #else /* !HAVE_NFS_PLUGIN_H */
1134 static void lookup_nonexport(FILE *f, char *dom, char *path,
1135 struct addrinfo *UNUSED(ai))
1137 dump_to_cache(f, dom, path, NULL);
1139 #endif /* !HAVE_NFS_PLUGIN_H */
1141 static void nfsd_export(FILE *f)
1145 * determine export options and return:
1146 * domain path expiry flags anonuid anongid fsid
1151 nfs_export *found = NULL;
1152 struct addrinfo *ai = NULL;
1154 if (readline(fileno(f), &lbuf, &lbuflen) != 1)
1157 xlog(D_CALL, "nfsd_export: inbuf '%s'", lbuf);
1160 dom = malloc(strlen(cp));
1161 path = malloc(strlen(cp));
1166 if (qword_get(&cp, dom, strlen(lbuf)) <= 0)
1168 if (qword_get(&cp, path, strlen(lbuf)) <= 0)
1173 if (is_ipaddr_client(dom)) {
1174 ai = lookup_client_addr(dom);
1179 found = lookup_export(dom, path, ai);
1182 if (dump_to_cache(f, dom, path, &found->m_export) < 0) {
1184 "Cannot export %s, possibly unsupported filesystem"
1185 " or fsid= required", path);
1186 dump_to_cache(f, dom, path, NULL);
1189 lookup_nonexport(f, dom, path, ai);
1192 xlog(D_CALL, "nfsd_export: found %p path %s", found, path ? path : NULL);
1194 if (path) free(path);
1201 void (*cache_handle)(FILE *f);
1203 char vbuf[RPC_CHAN_BUF_SIZE];
1205 { "auth.unix.ip", auth_unix_ip, NULL, ""},
1206 { "auth.unix.gid", auth_unix_gid, NULL, ""},
1207 { "nfsd.export", nfsd_export, NULL, ""},
1208 { "nfsd.fh", nfsd_fh, NULL, ""},
1209 { NULL, NULL, NULL, ""}
1212 extern int manage_gids;
1215 * cache_open - prepare communications channels with kernel RPC caches
1218 void cache_open(void)
1221 for (i=0; cachelist[i].cache_name; i++ ) {
1223 if (!manage_gids && cachelist[i].cache_handle == auth_unix_gid)
1225 sprintf(path, "/proc/net/rpc/%s/channel", cachelist[i].cache_name);
1226 cachelist[i].f = fopen(path, "r+");
1227 if (cachelist[i].f != NULL) {
1228 setvbuf(cachelist[i].f, cachelist[i].vbuf, _IOLBF,
1235 * cache_set_fds - prepare cache file descriptors for one iteration of the service loop
1236 * @fdset: pointer to fd_set to prepare
1238 void cache_set_fds(fd_set *fdset)
1241 for (i=0; cachelist[i].cache_name; i++) {
1243 FD_SET(fileno(cachelist[i].f), fdset);
1248 * cache_process_req - process any active cache file descriptors during service loop iteration
1249 * @fdset: pointer to fd_set to examine for activity
1251 int cache_process_req(fd_set *readfds)
1255 for (i=0; cachelist[i].cache_name; i++) {
1256 if (cachelist[i].f != NULL &&
1257 FD_ISSET(fileno(cachelist[i].f), readfds)) {
1259 cachelist[i].cache_handle(cachelist[i].f);
1260 FD_CLR(fileno(cachelist[i].f), readfds);
1268 * Give IP->domain and domain+path->options to kernel
1269 * % echo nfsd $IP $[now+DEFAULT_TTL] $domain > /proc/net/rpc/auth.unix.ip/channel
1270 * % echo $domain $path $[now+DEFAULT_TTL] $options $anonuid $anongid $fsid > /proc/net/rpc/nfsd.export/channel
1273 static int cache_export_ent(char *domain, struct exportent *exp, char *path)
1276 FILE *f = fopen("/proc/net/rpc/nfsd.export/channel", "w");
1280 err = dump_to_cache(f, domain, exp->e_path, exp);
1283 "Cannot export %s, possibly unsupported filesystem or"
1284 " fsid= required", exp->e_path);
1287 while (err == 0 && (exp->e_flags & NFSEXP_CROSSMOUNT) && path) {
1288 /* really an 'if', but we can break out of
1289 * a 'while' more easily */
1290 /* Look along 'path' for other filesystems
1291 * and export them with the same options
1294 size_t l = strlen(exp->e_path);
1297 if (strlen(path) <= l || path[l] != '/' ||
1298 strncmp(exp->e_path, path, l) != 0)
1300 if (stat(exp->e_path, &stb) != 0)
1303 while(path[l] == '/') {
1305 /* errors for submount should fail whole filesystem */
1309 while (path[l] != '/' && path[l])
1313 err2 = lstat(path, &stb);
1317 if (stb.st_dev == dev)
1321 dump_to_cache(f, domain, path, exp);
1332 * cache_export - Inform kernel of a new nfs_export
1333 * @exp: target nfs_export
1334 * @path: NUL-terminated C string containing export path
1336 int cache_export(nfs_export *exp, char *path)
1338 char buf[INET6_ADDRSTRLEN];
1342 f = fopen("/proc/net/rpc/auth.unix.ip/channel", "w");
1347 qword_print(f, "nfsd");
1349 host_ntop(get_addrlist(exp->m_client, 0), buf, sizeof(buf)));
1350 qword_printtimefrom(f, exp->m_export.e_ttl);
1351 qword_print(f, exp->m_client->m_hostname);
1356 err = cache_export_ent(exp->m_client->m_hostname, &exp->m_export, path)
1362 * cache_get_filehandle - given an nfs_export, get its root filehandle
1363 * @exp: target nfs_export
1364 * @len: length of requested file handle
1365 * @p: NUL-terminated C string containing export path
1367 * Returns pointer to NFS file handle of root directory of export
1370 * echo $domain $path $length
1371 * read filehandle <&0
1372 * } <> /proc/fs/nfsd/filehandle
1375 cache_get_filehandle(nfs_export *exp, int len, char *p)
1377 FILE *f = fopen("/proc/fs/nfsd/filehandle", "r+");
1381 static struct nfs_fh_len fh;
1384 f = fopen("/proc/fs/nfs/filehandle", "r+");
1388 qword_print(f, exp->m_client->m_hostname);
1390 qword_printint(f, len);
1391 failed = qword_eol(f);
1394 failed = (fgets(buf, sizeof(buf), f) == NULL);
1398 memset(fh.fh_handle, 0, sizeof(fh.fh_handle));
1399 fh.fh_size = qword_get(&bp, (char *)fh.fh_handle, NFS3_FHSIZE);