&& p1[l2] == '/';
}
-static void nfsd_fh(FILE *f)
-{
- /* request are:
- * domain fsidtype fsid
- * interpret fsid, find export point and options, and write:
- * domain fsidtype fsid expiry path
- */
- char *cp;
- char *dom;
+struct parsed_fsid {
int fsidtype;
- int fsidlen;
- unsigned int dev, major=0, minor=0;
- unsigned int inode=0;
- unsigned long long inode64;
- unsigned int fsidnum=0;
- char fsid[32];
- struct exportent *found = NULL;
- struct addrinfo *ai = NULL;
- char *found_path = NULL;
- nfs_export *exp;
- int i;
- int dev_missing = 0;
- int uuidlen = 0;
- char *fhuuid = NULL;
-
- if (readline(fileno(f), &lbuf, &lbuflen) != 1)
- return;
+ /* We could use a union for this, but it would be more
+ * complicated; why bother? */
+ unsigned int inode;
+ unsigned int minor;
+ unsigned int major;
+ unsigned int fsidnum;
+ int uuidlen;
+ char *fhuuid;
+};
- xlog(D_CALL, "nfsd_fh: inbuf '%s'", lbuf);
+int parse_fsid(int fsidtype, int fsidlen, char *fsid, struct parsed_fsid *parsed)
+{
+ unsigned int dev;
+ unsigned long long inode64;
- cp = lbuf;
-
- dom = malloc(strlen(cp));
- if (dom == NULL)
- return;
- if (qword_get(&cp, dom, strlen(cp)) <= 0)
- goto out;
- if (qword_get_int(&cp, &fsidtype) != 0)
- goto out;
- if (fsidtype < 0 || fsidtype > 7)
- goto out; /* unknown type */
- if ((fsidlen = qword_get(&cp, fsid, 32)) <= 0)
- goto out;
+ parsed->fsidtype = fsidtype;
switch(fsidtype) {
case FSID_DEV: /* 4 bytes: 2 major, 2 minor, 4 inode */
if (fsidlen != 8)
- goto out;
+ return -1;
memcpy(&dev, fsid, 4);
- memcpy(&inode, fsid+4, 4);
- major = ntohl(dev)>>16;
- minor = ntohl(dev) & 0xFFFF;
+ memcpy(&parsed->inode, fsid+4, 4);
+ parsed->major = ntohl(dev)>>16;
+ parsed->minor = ntohl(dev) & 0xFFFF;
break;
case FSID_NUM: /* 4 bytes - fsid */
if (fsidlen != 4)
- goto out;
- memcpy(&fsidnum, fsid, 4);
+ return -1;
+ memcpy(&parsed->fsidnum, fsid, 4);
break;
case FSID_MAJOR_MINOR: /* 12 bytes: 4 major, 4 minor, 4 inode
* an historical accident
*/
if (fsidlen != 12)
- goto out;
- memcpy(&dev, fsid, 4); major = ntohl(dev);
- memcpy(&dev, fsid+4, 4); minor = ntohl(dev);
- memcpy(&inode, fsid+8, 4);
+ return -1;
+ memcpy(&dev, fsid, 4);
+ parsed->major = ntohl(dev);
+ memcpy(&dev, fsid+4, 4);
+ parsed->minor = ntohl(dev);
+ memcpy(&parsed->inode, fsid+8, 4);
break;
case FSID_ENCODE_DEV: /* 8 bytes: 4 byte packed device number, 4 inode */
* no-one outside this host has any business interpreting it
*/
if (fsidlen != 8)
- goto out;
+ return -1;
memcpy(&dev, fsid, 4);
- memcpy(&inode, fsid+4, 4);
- major = (dev & 0xfff00) >> 8;
- minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
+ memcpy(&parsed->inode, fsid+4, 4);
+ parsed->major = (dev & 0xfff00) >> 8;
+ parsed->minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
break;
case FSID_UUID4_INUM: /* 4 byte inode number and 4 byte uuid */
if (fsidlen != 8)
- goto out;
- memcpy(&inode, fsid, 4);
- uuidlen = 4;
- fhuuid = fsid+4;
+ return -1;
+ memcpy(&parsed->inode, fsid, 4);
+ parsed->uuidlen = 4;
+ parsed->fhuuid = fsid+4;
break;
case FSID_UUID8: /* 8 byte uuid */
if (fsidlen != 8)
- goto out;
- uuidlen = 8;
- fhuuid = fsid;
+ return -1;
+ parsed->uuidlen = 8;
+ parsed->fhuuid = fsid;
break;
case FSID_UUID16: /* 16 byte uuid */
if (fsidlen != 16)
- goto out;
- uuidlen = 16;
- fhuuid = fsid;
+ return -1;
+ parsed->uuidlen = 16;
+ parsed->fhuuid = fsid;
break;
case FSID_UUID16_INUM: /* 8 byte inode number and 16 byte uuid */
if (fsidlen != 24)
- goto out;
+ return -1;
memcpy(&inode64, fsid, 8);
- inode = inode64;
- uuidlen = 16;
- fhuuid = fsid+8;
+ parsed->inode = inode64;
+ parsed->uuidlen = 16;
+ parsed->fhuuid = fsid+8;
break;
}
+ return 0;
+}
+
+static bool match_fsid(struct parsed_fsid *parsed, nfs_export *exp, char *path)
+{
+ struct stat stb;
+ int type;
+ char u[16];
+
+ if (stat(path, &stb) != 0)
+ return false;
+ if (!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode))
+ return false;
+
+ switch (parsed->fsidtype) {
+ case FSID_DEV:
+ case FSID_MAJOR_MINOR:
+ case FSID_ENCODE_DEV:
+ if (stb.st_ino != parsed->inode)
+ return false;
+ if (parsed->major != major(stb.st_dev) ||
+ parsed->minor != minor(stb.st_dev))
+ return false;
+ return true;
+ case FSID_NUM:
+ if (((exp->m_export.e_flags & NFSEXP_FSID) == 0 ||
+ exp->m_export.e_fsid != parsed->fsidnum))
+ return false;
+ return true;
+ case FSID_UUID4_INUM:
+ case FSID_UUID16_INUM:
+ if (stb.st_ino != parsed->inode)
+ return false;
+ goto check_uuid;
+ case FSID_UUID8:
+ case FSID_UUID16:
+ if (!is_mountpoint(path))
+ return false;
+ check_uuid:
+ if (exp->m_export.e_uuid)
+ get_uuid(exp->m_export.e_uuid, parsed->uuidlen, u);
+ else
+ for (type = 0;
+ uuid_by_path(path, type, parsed->uuidlen, u);
+ type++)
+ if (memcmp(u, parsed->fhuuid, parsed->uuidlen) == 0)
+ return true;
+
+ if (memcmp(u, parsed->fhuuid, parsed->uuidlen) != 0)
+ return false;
+ return true;
+ }
+ /* Well, unreachable, actually: */
+ return false;
+}
+
+static void nfsd_fh(FILE *f)
+{
+ /* request are:
+ * domain fsidtype fsid
+ * interpret fsid, find export point and options, and write:
+ * domain fsidtype fsid expiry path
+ */
+ char *cp;
+ char *dom;
+ int fsidtype;
+ int fsidlen;
+ char fsid[32];
+ struct parsed_fsid parsed;
+ struct exportent *found = NULL;
+ struct addrinfo *ai = NULL;
+ char *found_path = NULL;
+ nfs_export *exp;
+ int i;
+ int dev_missing = 0;
+
+ if (readline(fileno(f), &lbuf, &lbuflen) != 1)
+ return;
+
+ xlog(D_CALL, "nfsd_fh: inbuf '%s'", lbuf);
+
+ cp = lbuf;
+
+ dom = malloc(strlen(cp));
+ if (dom == NULL)
+ return;
+ if (qword_get(&cp, dom, strlen(cp)) <= 0)
+ goto out;
+ if (qword_get_int(&cp, &fsidtype) != 0)
+ goto out;
+ if (fsidtype < 0 || fsidtype > 7)
+ goto out; /* unknown type */
+ if ((fsidlen = qword_get(&cp, fsid, 32)) <= 0)
+ goto out;
+ if (parse_fsid(fsidtype, fsidlen, fsid, &parsed))
+ goto out;
auth_reload();
for (i=0 ; i < MCL_MAXTYPES; i++) {
nfs_export *next_exp;
for (exp = exportlist[i].p_head; exp; exp = next_exp) {
- struct stat stb;
- char u[16];
char *path;
- int type;
if (exp->m_export.e_flags & NFSEXP_CROSSMOUNT) {
static nfs_export *prev = NULL;
exp->m_export.e_mountpoint:
exp->m_export.e_path))
dev_missing ++;
- if (stat(path, &stb) != 0)
- continue;
- if (!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode)) {
+
+ if (!match_fsid(&parsed, exp, path))
continue;
- }
- switch(fsidtype){
- case FSID_DEV:
- case FSID_MAJOR_MINOR:
- case FSID_ENCODE_DEV:
- if (stb.st_ino != inode)
- continue;
- if (major != major(stb.st_dev) ||
- minor != minor(stb.st_dev))
- continue;
- break;
- case FSID_NUM:
- if (((exp->m_export.e_flags & NFSEXP_FSID) == 0 ||
- exp->m_export.e_fsid != fsidnum))
- continue;
- break;
- case FSID_UUID4_INUM:
- case FSID_UUID16_INUM:
- if (stb.st_ino != inode)
- continue;
- goto check_uuid;
- case FSID_UUID8:
- case FSID_UUID16:
- if (!is_mountpoint(path))
- continue;
- check_uuid:
- if (exp->m_export.e_uuid)
- get_uuid(exp->m_export.e_uuid,
- uuidlen, u);
- else
- for (type = 0;
- uuid_by_path(path, type, uuidlen, u);
- type++)
- if (memcmp(u, fhuuid, uuidlen) == 0)
- break;
-
- if (memcmp(u, fhuuid, uuidlen) != 0)
- continue;
- break;
- }
if (use_ipaddr) {
if (ai == NULL) {
struct addrinfo *tmp;
found_path = strdup(path);
if (found_path == NULL)
goto out;
- } else if (strcmp(found->e_path, exp->m_export.e_path)
+ } else if (strcmp(found->e_path, exp->m_export.e_path) != 0
&& !subexport(found, &exp->m_export))
{
xlog(L_WARNING, "%s and %s have same filehandle for %s, using first",
found_path, path, dom);
+ } else {
+ /* same path, if one is V4ROOT, choose the other */
+ if (found->e_flags & NFSEXP_V4ROOT) {
+ found = &exp->m_export;
+ free(found_path);
+ found_path = strdup(path);
+ if (found_path == NULL)
+ goto out;
+ }
}
}
}
found_type = i;
continue;
}
-
- /* Always prefer non-V4ROOT mounts */
- if (found->m_export.e_flags & NFSEXP_V4ROOT)
+ /* Always prefer non-V4ROOT exports */
+ if (exp->m_export.e_flags & NFSEXP_V4ROOT)
+ continue;
+ if (found->m_export.e_flags & NFSEXP_V4ROOT) {
+ found = exp;
+ found_type = i;
continue;
+ }
/* If one is a CROSSMOUNT, then prefer the longest path */
if (((found->m_export.e_flags & NFSEXP_CROSSMOUNT) ||
return found;
}
+#ifdef HAVE_NFS_PLUGIN_H
+#include <dlfcn.h>
+#include <nfs-plugin.h>
+
+/*
+ * Walk through a set of FS locations and build a set of export options.
+ * Returns true if all went to plan; otherwise, false.
+ */
+static _Bool
+locations_to_options(struct jp_ops *ops, nfs_fsloc_set_t locations,
+ char *options, size_t remaining, int *ttl)
+{
+ char *server, *last_path, *rootpath, *ptr;
+ _Bool seen = false;
+
+ last_path = NULL;
+ rootpath = NULL;
+ server = NULL;
+ ptr = options;
+ *ttl = 0;
+
+ for (;;) {
+ enum jp_status status;
+ int len;
+
+ status = ops->jp_get_next_location(locations, &server,
+ &rootpath, ttl);
+ if (status == JP_EMPTY)
+ break;
+ if (status != JP_OK) {
+ xlog(D_GENERAL, "%s: failed to parse location: %s",
+ __func__, ops->jp_error(status));
+ goto out_false;
+ }
+ xlog(D_GENERAL, "%s: Location: %s:%s",
+ __func__, server, rootpath);
+
+ if (last_path && strcmp(rootpath, last_path) == 0) {
+ len = snprintf(ptr, remaining, "+%s", server);
+ if (len < 0) {
+ xlog(D_GENERAL, "%s: snprintf: %m", __func__);
+ goto out_false;
+ }
+ if ((size_t)len >= remaining) {
+ xlog(D_GENERAL, "%s: options buffer overflow", __func__);
+ goto out_false;
+ }
+ remaining -= (size_t)len;
+ ptr += len;
+ } else {
+ if (last_path == NULL)
+ len = snprintf(ptr, remaining, "refer=%s@%s",
+ rootpath, server);
+ else
+ len = snprintf(ptr, remaining, ":%s@%s",
+ rootpath, server);
+ if (len < 0) {
+ xlog(D_GENERAL, "%s: snprintf: %m", __func__);
+ goto out_false;
+ }
+ if ((size_t)len >= remaining) {
+ xlog(D_GENERAL, "%s: options buffer overflow",
+ __func__);
+ goto out_false;
+ }
+ remaining -= (size_t)len;
+ ptr += len;
+ last_path = rootpath;
+ }
+
+ seen = true;
+ free(rootpath);
+ free(server);
+ }
+
+ xlog(D_CALL, "%s: options='%s', ttl=%d",
+ __func__, options, *ttl);
+ return seen;
+
+out_false:
+ free(rootpath);
+ free(server);
+ return false;
+}
+
+/*
+ * Walk through the set of FS locations and build an exportent.
+ * Returns pointer to an exportent if "junction" refers to a junction.
+ *
+ * Returned exportent points to static memory.
+ */
+static struct exportent *do_locations_to_export(struct jp_ops *ops,
+ nfs_fsloc_set_t locations, const char *junction,
+ char *options, size_t options_len)
+{
+ struct exportent *exp;
+ int ttl;
+
+ if (!locations_to_options(ops, locations, options, options_len, &ttl))
+ return NULL;
+
+ exp = mkexportent("*", (char *)junction, options);
+ if (exp == NULL) {
+ xlog(L_ERROR, "%s: Failed to construct exportent", __func__);
+ return NULL;
+ }
+
+ exp->e_uuid = NULL;
+ exp->e_ttl = ttl;
+ return exp;
+}
+
+/*
+ * Convert set of FS locations to an exportent. Returns pointer to
+ * an exportent if "junction" refers to a junction.
+ *
+ * Returned exportent points to static memory.
+ */
+static struct exportent *locations_to_export(struct jp_ops *ops,
+ nfs_fsloc_set_t locations, const char *junction)
+{
+ struct exportent *exp;
+ char *options;
+
+ options = malloc(BUFSIZ);
+ if (options == NULL) {
+ xlog(D_GENERAL, "%s: failed to allocate options buffer",
+ __func__);
+ return NULL;
+ }
+ options[0] = '\0';
+
+ exp = do_locations_to_export(ops, locations, junction,
+ options, BUFSIZ);
+
+ free(options);
+ return exp;
+}
+
+/*
+ * Retrieve locations information in "junction" and dump it to the
+ * kernel. Returns pointer to an exportent if "junction" refers
+ * to a junction.
+ *
+ * Returned exportent points to static memory.
+ */
+static struct exportent *invoke_junction_ops(void *handle,
+ const char *junction)
+{
+ nfs_fsloc_set_t locations;
+ struct exportent *exp;
+ enum jp_status status;
+ struct jp_ops *ops;
+ char *error;
+
+ ops = (struct jp_ops *)dlsym(handle, "nfs_junction_ops");
+ error = dlerror();
+ if (error != NULL) {
+ xlog(D_GENERAL, "%s: dlsym(jp_junction_ops): %s",
+ __func__, error);
+ return NULL;
+ }
+ if (ops->jp_api_version != JP_API_VERSION) {
+ xlog(D_GENERAL, "%s: unrecognized junction API version: %u",
+ __func__, ops->jp_api_version);
+ return NULL;
+ }
+
+ status = ops->jp_init(false);
+ if (status != JP_OK) {
+ xlog(D_GENERAL, "%s: failed to resolve %s: %s",
+ __func__, junction, ops->jp_error(status));
+ return NULL;
+ }
+
+ status = ops->jp_get_locations(junction, &locations);
+ if (status != JP_OK) {
+ xlog(D_GENERAL, "%s: failed to resolve %s: %s",
+ __func__, junction, ops->jp_error(status));
+ return NULL;
+ }
+
+ exp = locations_to_export(ops, locations, junction);
+
+ ops->jp_put_locations(locations);
+ ops->jp_done();
+ return exp;
+}
+
+/*
+ * Load the junction plug-in, then try to resolve "pathname".
+ * Returns pointer to an initialized exportent if "junction"
+ * refers to a junction, or NULL if not.
+ *
+ * Returned exportent points to static memory.
+ */
+static struct exportent *lookup_junction(const char *pathname)
+{
+ struct exportent *exp;
+ void *handle;
+
+ handle = dlopen("libnfsjunct.so", RTLD_NOW);
+ if (handle == NULL) {
+ xlog(D_GENERAL, "%s: dlopen: %s", __func__, dlerror());
+ return NULL;
+ }
+ (void)dlerror(); /* Clear any error */
+
+ exp = invoke_junction_ops(handle, pathname);
+
+ /* We could leave it loaded to make junction resolution
+ * faster next time. However, if we want to replace the
+ * library, that would require restarting mountd. */
+ (void)dlclose(handle);
+ return exp;
+}
+#else /* !HAVE_NFS_PLUGIN_H */
+static inline struct exportent *lookup_junction(const char *UNUSED(pathname))
+{
+ return NULL;
+}
+#endif /* !HAVE_NFS_PLUGIN_H */
+
static void nfsd_export(FILE *f)
{
/* requests are:
dump_to_cache(f, dom, path, NULL);
}
} else {
- dump_to_cache(f, dom, path, NULL);
+ dump_to_cache(f, dom, path, lookup_junction(path));
}
out:
xlog(D_CALL, "nfsd_export: found %p path %s", found, path ? path : NULL);
projects / nfs-utils.git / blobdiff