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>
34 #include "pseudoflavors.h"
37 #include "blkid/blkid.h"
41 * Invoked by RPC service loop
43 void cache_set_fds(fd_set *fdset);
44 int cache_process_req(fd_set *readfds);
58 * Support routines for text-based upcalls.
59 * Fields are separated by spaces.
60 * Fields are either mangled to quote space tab newline slosh with slosh
61 * or a hexified with a leading \x
62 * Record is terminated with newline.
65 static int cache_export_ent(char *domain, struct exportent *exp, char *p);
67 #define INITIAL_MANAGED_GROUPS 100
71 extern int use_ipaddr;
73 static void auth_unix_ip(FILE *f)
77 * Ignore if class != "nfsd"
78 * Otherwise find domainname and write back:
80 * "nfsd" IP-ADDR expiry domainname
84 char ipaddr[INET6_ADDRSTRLEN];
86 struct addrinfo *tmp = NULL;
87 if (readline(fileno(f), &lbuf, &lbuflen) != 1)
90 xlog(D_CALL, "auth_unix_ip: inbuf '%s'", lbuf);
94 if (qword_get(&cp, class, 20) <= 0 ||
95 strcmp(class, "nfsd") != 0)
98 if (qword_get(&cp, ipaddr, sizeof(ipaddr)) <= 0)
101 tmp = host_pton(ipaddr);
107 /* addr is a valid, interesting address, find the domain name... */
109 struct addrinfo *ai = NULL;
111 ai = client_resolve(tmp->ai_addr);
113 client = client_compose(ai);
117 qword_print(f, "nfsd");
118 qword_print(f, ipaddr);
119 qword_printtimefrom(f, DEFAULT_TTL);
121 qword_print(f, ipaddr);
123 qword_print(f, *client?client:"DEFAULT");
125 xlog(D_CALL, "auth_unix_ip: client %p '%s'", client, client?client: "DEFAULT");
132 static void auth_unix_gid(FILE *f)
137 * uid expiry count list of group ids
141 static gid_t *groups = NULL;
142 static int groups_len = 0;
148 if (groups_len == 0) {
149 groups = malloc(sizeof(gid_t) * INITIAL_MANAGED_GROUPS);
153 groups_len = INITIAL_MANAGED_GROUPS;
156 ngroups = groups_len;
158 if (readline(fileno(f), &lbuf, &lbuflen) != 1)
162 if (qword_get_uint(&cp, &uid) != 0)
169 rv = getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
170 if (rv == -1 && ngroups >= groups_len) {
171 more_groups = realloc(groups, sizeof(gid_t)*ngroups);
175 groups = more_groups;
176 groups_len = ngroups;
177 rv = getgrouplist(pw->pw_name, pw->pw_gid,
182 qword_printuint(f, uid);
183 qword_printtimefrom(f, DEFAULT_TTL);
185 qword_printuint(f, ngroups);
186 for (i=0; i<ngroups; i++)
187 qword_printuint(f, groups[i]);
189 qword_printuint(f, 0);
194 static const char *get_uuid_blkdev(char *path)
196 /* We set *safe if we know that we need the
197 * fsid from statfs too.
199 static blkid_cache cache = NULL;
202 blkid_tag_iterate iter;
205 const char *val, *uuid = NULL;
208 blkid_get_cache(&cache, NULL);
210 if (stat(path, &stb) != 0)
212 devname = blkid_devno_to_devname(stb.st_dev);
215 dev = blkid_get_dev(cache, devname, BLKID_DEV_NORMAL);
219 iter = blkid_tag_iterate_begin(dev);
222 while (blkid_tag_next(iter, &type, &val) == 0) {
223 if (strcmp(type, "UUID") == 0)
225 if (strcmp(type, "TYPE") == 0 &&
226 strcmp(val, "btrfs") == 0) {
231 blkid_tag_iterate_end(iter);
235 #define get_uuid_blkdev(path) (NULL)
238 static int get_uuid(const char *val, size_t uuidlen, char *u)
240 /* extract hex digits from uuidstr and compose a uuid
241 * of the given length (max 16), xoring bytes to make
246 memset(u, 0, uuidlen);
247 for ( ; *val ; val++) {
268 static int uuid_by_path(char *path, int type, size_t uuidlen, char *uuid)
270 /* get a uuid for the filesystem found at 'path'.
271 * There are several possible ways of generating the
273 * Type 0 is used for new filehandles, while other types
274 * may be used to interpret old filehandle - to ensure smooth
276 * We return 1 if a uuid was found (and it might be worth
277 * trying the next type) or 0 if no more uuid types can be
281 /* Possible sources of uuid are
285 * On some filesystems (e.g. vfat) the statfs64 uuid is simply an
286 * encoding of the device that the filesystem is mounted from, so
287 * it we be very bad to use that (as device numbers change). blkid
289 * On other filesystems (e.g. btrfs) the statfs64 uuid contains
290 * important info that the blkid uuid cannot contain: This happens
291 * when multiple subvolumes are exported (they have the same
292 * blkid uuid but different statfs64 uuids).
293 * We rely on get_uuid_blkdev *knowing* which is which and not returning
294 * a uuid for filesystems where the statfs64 uuid is better.
299 const char *blkid_val;
302 blkid_val = get_uuid_blkdev(path);
304 if (statfs64(path, &st) == 0 &&
305 (st.f_fsid.__val[0] || st.f_fsid.__val[1]))
306 snprintf(fsid_val, 17, "%08x%08x",
307 st.f_fsid.__val[0], st.f_fsid.__val[1]);
311 if (blkid_val && (type--) == 0)
313 else if (fsid_val[0] && (type--) == 0)
318 get_uuid(val, uuidlen, uuid);
322 /* Iterate through /etc/mtab, finding mountpoints
323 * at or below a given path
325 static char *next_mnt(void **v, char *p)
329 size_t l = strlen(p);
331 f = setmntent("/etc/mtab", "r");
335 while ((me = getmntent(f)) != NULL &&
336 (strncmp(me->mnt_dir, p, l) != 0 ||
337 me->mnt_dir[l] != '/'))
347 /* True iff e1 is a child of e2 and e2 has crossmnt set: */
348 static bool subexport(struct exportent *e1, struct exportent *e2)
350 char *p1 = e1->e_path, *p2 = e2->e_path;
351 size_t l2 = strlen(p2);
353 return e2->e_flags & NFSEXP_CROSSMOUNT
354 && strncmp(p1, p2, l2) == 0
360 /* We could use a union for this, but it would be more
361 * complicated; why bother? */
365 unsigned int fsidnum;
370 static int parse_fsid(int fsidtype, int fsidlen, char *fsid,
371 struct parsed_fsid *parsed)
374 unsigned long long inode64;
376 memset(parsed, 0, sizeof(*parsed));
377 parsed->fsidtype = fsidtype;
379 case FSID_DEV: /* 4 bytes: 2 major, 2 minor, 4 inode */
382 memcpy(&dev, fsid, 4);
383 memcpy(&parsed->inode, fsid+4, 4);
384 parsed->major = ntohl(dev)>>16;
385 parsed->minor = ntohl(dev) & 0xFFFF;
388 case FSID_NUM: /* 4 bytes - fsid */
391 memcpy(&parsed->fsidnum, fsid, 4);
394 case FSID_MAJOR_MINOR: /* 12 bytes: 4 major, 4 minor, 4 inode
395 * This format is never actually used but was
396 * an historical accident
400 memcpy(&dev, fsid, 4);
401 parsed->major = ntohl(dev);
402 memcpy(&dev, fsid+4, 4);
403 parsed->minor = ntohl(dev);
404 memcpy(&parsed->inode, fsid+8, 4);
407 case FSID_ENCODE_DEV: /* 8 bytes: 4 byte packed device number, 4 inode */
408 /* This is *host* endian, not net-byte-order, because
409 * no-one outside this host has any business interpreting it
413 memcpy(&dev, fsid, 4);
414 memcpy(&parsed->inode, fsid+4, 4);
415 parsed->major = (dev & 0xfff00) >> 8;
416 parsed->minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
419 case FSID_UUID4_INUM: /* 4 byte inode number and 4 byte uuid */
422 memcpy(&parsed->inode, fsid, 4);
424 parsed->fhuuid = fsid+4;
426 case FSID_UUID8: /* 8 byte uuid */
430 parsed->fhuuid = fsid;
432 case FSID_UUID16: /* 16 byte uuid */
435 parsed->uuidlen = 16;
436 parsed->fhuuid = fsid;
438 case FSID_UUID16_INUM: /* 8 byte inode number and 16 byte uuid */
441 memcpy(&inode64, fsid, 8);
442 parsed->inode = inode64;
443 parsed->uuidlen = 16;
444 parsed->fhuuid = fsid+8;
450 static bool match_fsid(struct parsed_fsid *parsed, nfs_export *exp, char *path)
456 if (stat(path, &stb) != 0)
458 if (!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode))
461 switch (parsed->fsidtype) {
463 case FSID_MAJOR_MINOR:
464 case FSID_ENCODE_DEV:
465 if (stb.st_ino != parsed->inode)
467 if (parsed->major != major(stb.st_dev) ||
468 parsed->minor != minor(stb.st_dev))
472 if (((exp->m_export.e_flags & NFSEXP_FSID) == 0 ||
473 exp->m_export.e_fsid != parsed->fsidnum))
476 case FSID_UUID4_INUM:
477 case FSID_UUID16_INUM:
478 if (stb.st_ino != parsed->inode)
483 if (!is_mountpoint(path))
486 if (exp->m_export.e_uuid)
487 get_uuid(exp->m_export.e_uuid, parsed->uuidlen, u);
490 uuid_by_path(path, type, parsed->uuidlen, u);
492 if (memcmp(u, parsed->fhuuid, parsed->uuidlen) == 0)
495 if (memcmp(u, parsed->fhuuid, parsed->uuidlen) != 0)
499 /* Well, unreachable, actually: */
503 static struct addrinfo *lookup_client_addr(char *dom)
505 struct addrinfo *ret;
506 struct addrinfo *tmp;
508 dom++; /* skip initial "$" */
510 tmp = host_pton(dom);
513 ret = client_resolve(tmp->ai_addr);
518 static void nfsd_fh(FILE *f)
521 * domain fsidtype fsid
522 * interpret fsid, find export point and options, and write:
523 * domain fsidtype fsid expiry path
530 struct parsed_fsid parsed;
531 struct exportent *found = NULL;
532 struct addrinfo *ai = NULL;
533 char *found_path = NULL;
538 if (readline(fileno(f), &lbuf, &lbuflen) != 1)
541 xlog(D_CALL, "nfsd_fh: inbuf '%s'", lbuf);
545 dom = malloc(strlen(cp));
548 if (qword_get(&cp, dom, strlen(cp)) <= 0)
550 if (qword_get_int(&cp, &fsidtype) != 0)
552 if (fsidtype < 0 || fsidtype > 7)
553 goto out; /* unknown type */
554 if ((fsidlen = qword_get(&cp, fsid, 32)) <= 0)
556 if (parse_fsid(fsidtype, fsidlen, fsid, &parsed))
561 if (is_ipaddr_client(dom)) {
562 ai = lookup_client_addr(dom);
567 /* Now determine export point for this fsid/domain */
568 for (i=0 ; i < MCL_MAXTYPES; i++) {
569 nfs_export *next_exp;
570 for (exp = exportlist[i].p_head; exp; exp = next_exp) {
573 if (exp->m_export.e_flags & NFSEXP_CROSSMOUNT) {
574 static nfs_export *prev = NULL;
575 static void *mnt = NULL;
579 path = next_mnt(&mnt, exp->m_export.e_path);
581 next_exp = exp->m_next;
589 path = exp->m_export.e_path;
593 path = exp->m_export.e_path;
594 next_exp = exp->m_next;
597 if (!is_ipaddr_client(dom)
598 && !namelist_client_matches(exp, dom))
600 if (exp->m_export.e_mountpoint &&
601 !is_mountpoint(exp->m_export.e_mountpoint[0]?
602 exp->m_export.e_mountpoint:
603 exp->m_export.e_path))
606 if (!match_fsid(&parsed, exp, path))
608 if (is_ipaddr_client(dom)
609 && !ipaddr_client_matches(exp, ai))
611 if (!found || subexport(&exp->m_export, found)) {
612 found = &exp->m_export;
614 found_path = strdup(path);
615 if (found_path == NULL)
617 } else if (strcmp(found->e_path, exp->m_export.e_path) != 0
618 && !subexport(found, &exp->m_export))
620 xlog(L_WARNING, "%s and %s have same filehandle for %s, using first",
621 found_path, path, dom);
623 /* same path, if one is V4ROOT, choose the other */
624 if (found->e_flags & NFSEXP_V4ROOT) {
625 found = &exp->m_export;
627 found_path = strdup(path);
628 if (found_path == NULL)
635 found->e_mountpoint &&
636 !is_mountpoint(found->e_mountpoint[0]?
639 /* Cannot export this yet
640 * should log a warning, but need to rate limit
641 xlog(L_WARNING, "%s not exported as %d not a mountpoint",
642 found->e_path, found->e_mountpoint);
644 /* FIXME we need to make sure we re-visit this later */
647 if (!found && dev_missing) {
648 /* The missing dev could be what we want, so just be
649 * quite rather than returning stale yet
655 if (cache_export_ent(dom, found, found_path) < 0)
659 qword_printint(f, fsidtype);
660 qword_printhex(f, fsid, fsidlen);
661 /* The fsid -> path lookup can be quite expensive as it
662 * potentially stats and reads lots of devices, and some of those
663 * might have spun-down. The Answer is not likely to
664 * change underneath us, and an 'exportfs -f' can always
665 * remove this from the kernel, so use a really log
666 * timeout. Maybe this should be configurable on the command
669 qword_printint(f, 0x7fffffff);
671 qword_print(f, found_path);
678 xlog(D_CALL, "nfsd_fh: found %p path %s", found, found ? found->e_path : NULL);
682 static void write_fsloc(FILE *f, struct exportent *ep)
684 struct servers *servers;
686 if (ep->e_fslocmethod == FSLOC_NONE)
689 servers = replicas_lookup(ep->e_fslocmethod, ep->e_fslocdata);
692 qword_print(f, "fsloc");
693 qword_printint(f, servers->h_num);
694 if (servers->h_num >= 0) {
696 for (i=0; i<servers->h_num; i++) {
697 qword_print(f, servers->h_mp[i]->h_host);
698 qword_print(f, servers->h_mp[i]->h_path);
701 qword_printint(f, servers->h_referral);
702 release_replicas(servers);
705 static void write_secinfo(FILE *f, struct exportent *ep, int flag_mask)
709 for (p = ep->e_secinfo; p->flav; p++)
711 if (p == ep->e_secinfo) {
712 /* There was no sec= option */
715 qword_print(f, "secinfo");
716 qword_printint(f, p - ep->e_secinfo);
717 for (p = ep->e_secinfo; p->flav; p++) {
718 qword_printint(f, p->flav->fnum);
719 qword_printint(f, p->flags & flag_mask);
724 static int dump_to_cache(FILE *f, char *domain, char *path, struct exportent *exp)
726 qword_print(f, domain);
727 qword_print(f, path);
729 int different_fs = strcmp(path, exp->e_path) != 0;
730 int flag_mask = different_fs ? ~NFSEXP_FSID : ~0;
732 qword_printtimefrom(f, exp->e_ttl);
733 qword_printint(f, exp->e_flags & flag_mask);
734 qword_printint(f, exp->e_anonuid);
735 qword_printint(f, exp->e_anongid);
736 qword_printint(f, exp->e_fsid);
738 write_secinfo(f, exp, flag_mask);
739 if (exp->e_uuid == NULL || different_fs) {
741 if (uuid_by_path(path, 0, 16, u)) {
742 qword_print(f, "uuid");
743 qword_printhex(f, u, 16);
747 get_uuid(exp->e_uuid, 16, u);
748 qword_print(f, "uuid");
749 qword_printhex(f, u, 16);
752 qword_printtimefrom(f, DEFAULT_TTL);
756 static int is_subdirectory(char *child, char *parent)
758 size_t l = strlen(parent);
760 return strcmp(child, parent) == 0
761 || (strncmp(child, parent, l) == 0 && child[l] == '/');
764 static int path_matches(nfs_export *exp, char *path)
766 if (exp->m_export.e_flags & NFSEXP_CROSSMOUNT)
767 return is_subdirectory(path, exp->m_export.e_path);
768 return strcmp(path, exp->m_export.e_path) == 0;
772 export_matches(nfs_export *exp, char *dom, char *path, struct addrinfo *ai)
774 return path_matches(exp, path) && client_matches(exp, dom, ai);
778 lookup_export(char *dom, char *path, struct addrinfo *ai)
781 nfs_export *found = NULL;
785 for (i=0 ; i < MCL_MAXTYPES; i++) {
786 for (exp = exportlist[i].p_head; exp; exp = exp->m_next) {
787 if (!export_matches(exp, dom, path, ai))
794 /* Always prefer non-V4ROOT exports */
795 if (exp->m_export.e_flags & NFSEXP_V4ROOT)
797 if (found->m_export.e_flags & NFSEXP_V4ROOT) {
803 /* If one is a CROSSMOUNT, then prefer the longest path */
804 if (((found->m_export.e_flags & NFSEXP_CROSSMOUNT) ||
805 (exp->m_export.e_flags & NFSEXP_CROSSMOUNT)) &&
806 strlen(found->m_export.e_path) !=
807 strlen(exp->m_export.e_path)) {
809 if (strlen(exp->m_export.e_path) >
810 strlen(found->m_export.e_path)) {
816 } else if (found_type == i && found->m_warned == 0) {
817 xlog(L_WARNING, "%s exported to both %s and %s, "
818 "arbitrarily choosing options from first",
819 path, found->m_client->m_hostname, exp->m_client->m_hostname,
828 #ifdef HAVE_NFS_PLUGIN_H
830 #include <nfs-plugin.h>
833 * Find the export entry for the parent of "pathname".
834 * Caller must not free returned exportent.
836 static struct exportent *lookup_parent_export(char *dom,
837 const char *pathname, struct addrinfo *ai)
839 char *parent, *slash;
842 parent = strdup(pathname);
843 if (parent == NULL) {
844 xlog(D_GENERAL, "%s: failed to allocate parent path buffer",
848 xlog(D_CALL, "%s: pathname = '%s'", __func__, pathname);
851 /* shorten pathname by one component */
852 slash = strrchr(parent, '/');
854 xlog(D_GENERAL, "%s: no slash found in pathname",
860 if (strlen(parent) == 0) {
861 result = lookup_export(dom, "/", ai);
862 if (result == NULL) {
863 xlog(L_ERROR, "%s: no root export found.", __func__);
869 result = lookup_export(dom, parent, ai);
870 if (result == NULL) {
871 xlog(D_GENERAL, "%s: lookup_export(%s) found nothing",
877 xlog(D_CALL, "%s: found export for %s", __func__, parent);
879 return &result->m_export;
883 return mkexportent("*", "/", "insecure");
887 * Walk through a set of FS locations and build an e_fslocdata string.
888 * Returns true if all went to plan; otherwise, false.
890 static bool locations_to_fslocdata(struct jp_ops *ops,
891 nfs_fsloc_set_t locations, char *fslocdata,
892 size_t remaining, int *ttl)
894 char *server, *last_path, *rootpath, *ptr;
904 enum jp_status status;
907 status = ops->jp_get_next_location(locations, &server,
909 if (status == JP_EMPTY)
911 if (status != JP_OK) {
912 xlog(D_GENERAL, "%s: failed to parse location: %s",
913 __func__, ops->jp_error(status));
916 xlog(D_GENERAL, "%s: Location: %s:%s",
917 __func__, server, rootpath);
919 if (last_path && strcmp(rootpath, last_path) == 0) {
920 len = snprintf(ptr, remaining, "+%s", server);
922 xlog(D_GENERAL, "%s: snprintf: %m", __func__);
925 if ((size_t)len >= remaining) {
926 xlog(D_GENERAL, "%s: fslocdata buffer overflow", __func__);
929 remaining -= (size_t)len;
932 if (last_path == NULL)
933 len = snprintf(ptr, remaining, "%s@%s",
936 len = snprintf(ptr, remaining, ":%s@%s",
939 xlog(D_GENERAL, "%s: snprintf: %m", __func__);
942 if ((size_t)len >= remaining) {
943 xlog(D_GENERAL, "%s: fslocdata buffer overflow",
947 remaining -= (size_t)len;
949 last_path = rootpath;
957 xlog(D_CALL, "%s: fslocdata='%s', ttl=%d",
958 __func__, fslocdata, *ttl);
968 * Duplicate the junction's parent's export options and graft in
969 * the fslocdata we constructed from the locations list.
971 static struct exportent *create_junction_exportent(struct exportent *parent,
972 const char *junction, const char *fslocdata, int ttl)
974 static struct exportent *eep;
976 eep = (struct exportent *)malloc(sizeof(*eep));
980 dupexportent(eep, parent);
981 strcpy(eep->e_path, junction);
982 eep->e_hostname = strdup(parent->e_hostname);
983 if (eep->e_hostname == NULL) {
989 eep->e_ttl = (unsigned int)ttl;
991 free(eep->e_fslocdata);
992 eep->e_fslocdata = strdup(fslocdata);
993 if (eep->e_fslocdata == NULL) {
994 free(eep->e_hostname);
998 eep->e_fslocmethod = FSLOC_REFER;
1002 xlog(L_ERROR, "%s: No memory", __func__);
1007 * Walk through the set of FS locations and build an exportent.
1008 * Returns pointer to an exportent if "junction" refers to a junction.
1010 static struct exportent *locations_to_export(struct jp_ops *ops,
1011 nfs_fsloc_set_t locations, const char *junction,
1012 struct exportent *parent)
1014 static char fslocdata[BUFSIZ];
1017 fslocdata[0] = '\0';
1018 if (!locations_to_fslocdata(ops, locations,
1019 fslocdata, sizeof(fslocdata), &ttl))
1021 return create_junction_exportent(parent, junction, fslocdata, ttl);
1025 * Retrieve locations information in "junction" and dump it to the
1026 * kernel. Returns pointer to an exportent if "junction" refers
1029 static struct exportent *invoke_junction_ops(void *handle, char *dom,
1030 const char *junction, struct addrinfo *ai)
1032 struct exportent *parent, *exp = NULL;
1033 nfs_fsloc_set_t locations;
1034 enum jp_status status;
1038 ops = (struct jp_ops *)dlsym(handle, "nfs_junction_ops");
1040 if (error != NULL) {
1041 xlog(D_GENERAL, "%s: dlsym(jp_junction_ops): %s",
1045 if (ops->jp_api_version != JP_API_VERSION) {
1046 xlog(D_GENERAL, "%s: unrecognized junction API version: %u",
1047 __func__, ops->jp_api_version);
1051 status = ops->jp_init(false);
1052 if (status != JP_OK) {
1053 xlog(D_GENERAL, "%s: failed to resolve %s: %s",
1054 __func__, junction, ops->jp_error(status));
1058 status = ops->jp_get_locations(junction, &locations);
1062 case JP_NOTJUNCTION:
1063 xlog(D_GENERAL, "%s: %s is not a junction",
1064 __func__, junction);
1067 xlog(L_WARNING, "Dangling junction %s: %s",
1068 junction, ops->jp_error(status));
1072 parent = lookup_parent_export(dom, junction, ai);
1076 exp = locations_to_export(ops, locations, junction, parent);
1078 ops->jp_put_locations(locations);
1086 * Load the junction plug-in, then try to resolve "pathname".
1087 * Returns pointer to an initialized exportent if "junction"
1088 * refers to a junction, or NULL if not.
1090 static struct exportent *lookup_junction(char *dom, const char *pathname,
1091 struct addrinfo *ai)
1093 struct exportent *exp;
1096 handle = dlopen("libnfsjunct.so", RTLD_NOW);
1097 if (handle == NULL) {
1098 xlog(D_GENERAL, "%s: dlopen: %s", __func__, dlerror());
1101 (void)dlerror(); /* Clear any error */
1103 exp = invoke_junction_ops(handle, dom, pathname, ai);
1105 /* We could leave it loaded to make junction resolution
1106 * faster next time. However, if we want to replace the
1107 * library, that would require restarting mountd. */
1108 (void)dlclose(handle);
1112 static void lookup_nonexport(FILE *f, char *dom, char *path,
1113 struct addrinfo *ai)
1115 struct exportent *eep;
1117 eep = lookup_junction(dom, path, ai);
1118 dump_to_cache(f, dom, path, eep);
1121 exportent_release(eep);
1124 #else /* !HAVE_NFS_PLUGIN_H */
1125 static void lookup_nonexport(FILE *f, char *dom, char *path,
1126 struct addrinfo *UNUSED(ai))
1128 dump_to_cache(f, dom, path, NULL);
1130 #endif /* !HAVE_NFS_PLUGIN_H */
1132 static void nfsd_export(FILE *f)
1136 * determine export options and return:
1137 * domain path expiry flags anonuid anongid fsid
1142 nfs_export *found = NULL;
1143 struct addrinfo *ai = NULL;
1145 if (readline(fileno(f), &lbuf, &lbuflen) != 1)
1148 xlog(D_CALL, "nfsd_export: inbuf '%s'", lbuf);
1151 dom = malloc(strlen(cp));
1152 path = malloc(strlen(cp));
1157 if (qword_get(&cp, dom, strlen(lbuf)) <= 0)
1159 if (qword_get(&cp, path, strlen(lbuf)) <= 0)
1164 if (is_ipaddr_client(dom)) {
1165 ai = lookup_client_addr(dom);
1170 found = lookup_export(dom, path, ai);
1173 if (dump_to_cache(f, dom, path, &found->m_export) < 0) {
1175 "Cannot export %s, possibly unsupported filesystem"
1176 " or fsid= required", path);
1177 dump_to_cache(f, dom, path, NULL);
1180 lookup_nonexport(f, dom, path, ai);
1183 xlog(D_CALL, "nfsd_export: found %p path %s", found, path ? path : NULL);
1185 if (path) free(path);
1192 void (*cache_handle)(FILE *f);
1194 char vbuf[RPC_CHAN_BUF_SIZE];
1196 { "auth.unix.ip", auth_unix_ip, NULL, ""},
1197 { "auth.unix.gid", auth_unix_gid, NULL, ""},
1198 { "nfsd.export", nfsd_export, NULL, ""},
1199 { "nfsd.fh", nfsd_fh, NULL, ""},
1200 { NULL, NULL, NULL, ""}
1203 extern int manage_gids;
1206 * cache_open - prepare communications channels with kernel RPC caches
1209 void cache_open(void)
1212 for (i=0; cachelist[i].cache_name; i++ ) {
1214 if (!manage_gids && cachelist[i].cache_handle == auth_unix_gid)
1216 sprintf(path, "/proc/net/rpc/%s/channel", cachelist[i].cache_name);
1217 cachelist[i].f = fopen(path, "r+");
1218 if (cachelist[i].f != NULL) {
1219 setvbuf(cachelist[i].f, cachelist[i].vbuf, _IOLBF,
1226 * cache_set_fds - prepare cache file descriptors for one iteration of the service loop
1227 * @fdset: pointer to fd_set to prepare
1229 void cache_set_fds(fd_set *fdset)
1232 for (i=0; cachelist[i].cache_name; i++) {
1234 FD_SET(fileno(cachelist[i].f), fdset);
1239 * cache_process_req - process any active cache file descriptors during service loop iteration
1240 * @fdset: pointer to fd_set to examine for activity
1242 int cache_process_req(fd_set *readfds)
1246 for (i=0; cachelist[i].cache_name; i++) {
1247 if (cachelist[i].f != NULL &&
1248 FD_ISSET(fileno(cachelist[i].f), readfds)) {
1250 cachelist[i].cache_handle(cachelist[i].f);
1251 FD_CLR(fileno(cachelist[i].f), readfds);
1259 * Give IP->domain and domain+path->options to kernel
1260 * % echo nfsd $IP $[now+DEFAULT_TTL] $domain > /proc/net/rpc/auth.unix.ip/channel
1261 * % echo $domain $path $[now+DEFAULT_TTL] $options $anonuid $anongid $fsid > /proc/net/rpc/nfsd.export/channel
1264 static int cache_export_ent(char *domain, struct exportent *exp, char *path)
1267 FILE *f = fopen("/proc/net/rpc/nfsd.export/channel", "w");
1271 err = dump_to_cache(f, domain, exp->e_path, exp);
1274 "Cannot export %s, possibly unsupported filesystem or"
1275 " fsid= required", exp->e_path);
1278 while (err == 0 && (exp->e_flags & NFSEXP_CROSSMOUNT) && path) {
1279 /* really an 'if', but we can break out of
1280 * a 'while' more easily */
1281 /* Look along 'path' for other filesystems
1282 * and export them with the same options
1285 size_t l = strlen(exp->e_path);
1288 if (strlen(path) <= l || path[l] != '/' ||
1289 strncmp(exp->e_path, path, l) != 0)
1291 if (stat(exp->e_path, &stb) != 0)
1294 while(path[l] == '/') {
1296 /* errors for submount should fail whole filesystem */
1300 while (path[l] != '/' && path[l])
1304 err2 = lstat(path, &stb);
1308 if (stb.st_dev == dev)
1312 dump_to_cache(f, domain, path, exp);
1323 * cache_export - Inform kernel of a new nfs_export
1324 * @exp: target nfs_export
1325 * @path: NUL-terminated C string containing export path
1327 int cache_export(nfs_export *exp, char *path)
1329 char buf[INET6_ADDRSTRLEN];
1333 f = fopen("/proc/net/rpc/auth.unix.ip/channel", "w");
1338 qword_print(f, "nfsd");
1340 host_ntop(get_addrlist(exp->m_client, 0), buf, sizeof(buf)));
1341 qword_printtimefrom(f, exp->m_export.e_ttl);
1342 qword_print(f, exp->m_client->m_hostname);
1347 err = cache_export_ent(exp->m_client->m_hostname, &exp->m_export, path)
1353 * cache_get_filehandle - given an nfs_export, get its root filehandle
1354 * @exp: target nfs_export
1355 * @len: length of requested file handle
1356 * @p: NUL-terminated C string containing export path
1358 * Returns pointer to NFS file handle of root directory of export
1361 * echo $domain $path $length
1362 * read filehandle <&0
1363 * } <> /proc/fs/nfsd/filehandle
1366 cache_get_filehandle(nfs_export *exp, int len, char *p)
1368 FILE *f = fopen("/proc/fs/nfsd/filehandle", "r+");
1372 static struct nfs_fh_len fh;
1375 f = fopen("/proc/fs/nfs/filehandle", "r+");
1379 qword_print(f, exp->m_client->m_hostname);
1381 qword_printint(f, len);
1382 failed = qword_eol(f);
1385 failed = (fgets(buf, sizeof(buf), f) == NULL);
1389 memset(fh.fh_handle, 0, sizeof(fh.fh_handle));
1390 fh.fh_size = qword_get(&bp, (char *)fh.fh_handle, NFS3_FHSIZE);