diff options
Diffstat (limited to 'lib/tdb2/open.c')
| -rw-r--r-- | lib/tdb2/open.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/lib/tdb2/open.c b/lib/tdb2/open.c index b76bd24b2a..4965d86288 100644 --- a/lib/tdb2/open.c +++ b/lib/tdb2/open.c @@ -135,6 +135,7 @@ static enum TDB_ERROR tdb_new_database(struct tdb_context *tdb, newdb.hdr.recovery = 0; newdb.hdr.features_used = newdb.hdr.features_offered = TDB_FEATURE_MASK; newdb.hdr.seqnum = 0; + newdb.hdr.capabilities = 0; memset(newdb.hdr.reserved, 0, sizeof(newdb.hdr.reserved)); /* Initial hashes are empty. */ memset(newdb.hdr.hashtable, 0, sizeof(newdb.hdr.hashtable)); @@ -375,6 +376,54 @@ static bool is_tdb1(struct tdb1_header *hdr, const void *buf, ssize_t rlen) || hdr->version == TDB1_BYTEREV(TDB1_VERSION); } +/* The top three bits of the capability tell us whether it matters. */ +enum TDB_ERROR unknown_capability(struct tdb_context *tdb, const char *caller, + tdb_off_t type) +{ + if (type & TDB_CAP_NOOPEN) { + return tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR, + "%s: file has unknown capability %llu", + caller, type & TDB_CAP_NOOPEN); + } + + if ((type & TDB_CAP_NOWRITE) && !(tdb->flags & TDB_RDONLY)) { + return tdb_logerr(tdb, TDB_ERR_RDONLY, TDB_LOG_ERROR, + "%s: file has unknown capability %llu" + " (cannot write to it)", + caller, type & TDB_CAP_NOOPEN); + } + + if (type & TDB_CAP_NOCHECK) { + tdb->flags |= TDB_CANT_CHECK; + } + return TDB_SUCCESS; +} + +static enum TDB_ERROR capabilities_ok(struct tdb_context *tdb, + tdb_off_t capabilities) +{ + tdb_off_t off, next; + enum TDB_ERROR ecode = TDB_SUCCESS; + const struct tdb_capability *cap; + + /* Check capability list. */ + for (off = capabilities; off && ecode == TDB_SUCCESS; off = next) { + cap = tdb_access_read(tdb, off, sizeof(*cap), true); + if (TDB_PTR_IS_ERR(cap)) { + return TDB_PTR_ERR(cap); + } + + switch (cap->type & TDB_CAP_TYPE_MASK) { + /* We don't understand any capabilities (yet). */ + default: + ecode = unknown_capability(tdb, "tdb_open", cap->type); + } + next = cap->next; + tdb_access_release(tdb, cap); + } + return ecode; +} + struct tdb_context *tdb_open(const char *name, int tdb_flags, int open_flags, mode_t mode, union tdb_attribute *attr) @@ -667,6 +716,11 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags, goto fail; } + ecode = capabilities_ok(tdb, hdr.capabilities); + if (ecode != TDB_SUCCESS) { + goto fail; + } + /* Clear any features we don't understand. */ if ((open_flags & O_ACCMODE) != O_RDONLY) { hdr.features_used &= TDB_FEATURE_MASK; |