Don't overwrite tdbs with different version numbers.

[ccan] / ccan / tdb / test / run-bad-tdb-header.c

diff --git a/ccan/tdb/test/run-bad-tdb-header.c b/ccan/tdb/test/run-bad-tdb-header.c
new file mode 100644 (file)
index 0000000..1b02100
--- /dev/null
+++ b/ccan/tdb/test/run-bad-tdb-header.c
@@ -0,0 +1,54 @@
+#define _XOPEN_SOURCE 500
+#include "tdb/tdb.h"
+#include "tdb/io.c"
+#include "tdb/tdb.c"
+#include "tdb/lock.c"
+#include "tdb/freelist.c"
+#include "tdb/traverse.c"
+#include "tdb/transaction.c"
+#include "tdb/error.c"
+#include "tdb/open.c"
+#include "tap/tap.h"
+#include <stdlib.h>
+#include <err.h>
+
+int main(int argc, char *argv[])
+{
+       struct tdb_context *tdb;
+       struct tdb_header hdr;
+       int fd;
+
+       plan_tests(11);
+       /* Can open fine if complete crap, as long as O_CREAT. */
+       fd = open("/tmp/test.tdb", O_RDWR|O_CREAT|O_TRUNC, 0600);
+       ok1(fd >= 0);
+       ok1(write(fd, "hello world", 11) == 11);
+       close(fd);
+       tdb = tdb_open("/tmp/test.tdb", 1024, 0, O_RDWR, 0);
+       ok1(!tdb);
+       tdb = tdb_open("/tmp/test.tdb", 1024, 0, O_CREAT|O_RDWR, 0600);
+       ok1(tdb);
+       tdb_close(tdb);
+
+       /* Now, with wrong version it should *not* overwrite. */
+       fd = open("/tmp/test.tdb", O_RDWR);
+       ok1(fd >= 0);
+       ok1(read(fd, &hdr, sizeof(hdr)) == sizeof(hdr));
+       ok1(hdr.version == TDB_VERSION);
+       hdr.version++;
+       lseek(fd, 0, SEEK_SET);
+       ok1(write(fd, &hdr, sizeof(hdr)) == sizeof(hdr));
+       close(fd);
+
+       tdb = tdb_open("/tmp/test.tdb", 1024, 0, O_RDWR|O_CREAT, 0600);
+       ok1(errno == EIO);
+       ok1(!tdb);
+
+       /* With truncate, will be fine. */
+       tdb = tdb_open("/tmp/test.tdb", 1024, 0, O_RDWR|O_CREAT|O_TRUNC, 0600);
+       ok1(tdb);
+       tdb_close(tdb);
+       unlink("/tmp/test.tdb");
+
+       return exit_status();
+}