s3: Add cli_readlink

1 files changed, 175 insertions, 0 deletions

diff --git a/source3/libsmb/clisymlink.c b/source3/libsmb/clisymlink.c
index e5c2c1a89d..e744a38dbe 100644
--- a/source3/libsmb/clisymlink.c
+++ b/source3/libsmb/clisymlink.c
@@ -226,3 +226,178 @@ NTSTATUS cli_symlink(struct cli_state *cli, const char *oldname,
 	TALLOC_FREE(frame);
 	return status;
 }
+
+struct cli_readlink_state {
+	struct tevent_context *ev;
+	struct cli_state *cli;
+	uint16_t fnum;
+
+	uint16_t setup[4];
+	NTSTATUS get_reparse_status;
+	uint8_t *data;
+	uint32_t num_data;
+};
+
+static void cli_readlink_opened(struct tevent_req *subreq);
+static void cli_readlink_got_reparse_data(struct tevent_req *subreq);
+static void cli_readlink_closed(struct tevent_req *subreq);
+
+struct tevent_req *cli_readlink_send(TALLOC_CTX *mem_ctx,
+				     struct tevent_context *ev,
+				     struct cli_state *cli,
+				     const char *fname)
+{
+	struct tevent_req *req, *subreq;
+	struct cli_readlink_state *state;
+
+	req = tevent_req_create(mem_ctx, &state, struct cli_readlink_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	state->ev = ev;
+	state->cli = cli;
+
+	subreq = cli_ntcreate_send(
+		state, ev, cli, fname, 0, FILE_READ_ATTRIBUTES | FILE_READ_EA,
+		0, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
+		FILE_OPEN, FILE_OPEN_REPARSE_POINT, 0);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, cli_readlink_opened, req);
+	return req;
+}
+
+static void cli_readlink_opened(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct cli_readlink_state *state = tevent_req_data(
+		req, struct cli_readlink_state);
+	NTSTATUS status;
+
+	status = cli_ntcreate_recv(subreq, &state->fnum);
+	TALLOC_FREE(subreq);
+	if (tevent_req_nterror(req, status)) {
+		return;
+	}
+
+	SIVAL(state->setup, 0, FSCTL_GET_REPARSE_POINT);
+	SSVAL(state->setup, 4, state->fnum);
+	SCVAL(state->setup, 6, 1); /* IsFcntl */
+	SCVAL(state->setup, 7, 0); /* IsFlags */
+
+	subreq = cli_trans_send(state, state->ev, state->cli, SMBnttrans,
+				NULL, -1, /* name, fid */
+				NT_TRANSACT_IOCTL, 0,
+				state->setup, 4, 0, /* setup */
+				NULL, 0, 0,	    /* param */
+				NULL, 0, 16384); /* data */
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq, cli_readlink_got_reparse_data, req);
+}
+
+static void cli_readlink_got_reparse_data(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct cli_readlink_state *state = tevent_req_data(
+		req, struct cli_readlink_state);
+
+	state->get_reparse_status = cli_trans_recv(
+		subreq, state, NULL,
+		NULL, 0, NULL,	/* rsetup */
+		NULL, 0, NULL,	/* rparam */
+		&state->data, 20, &state->num_data); /* rdata */
+	TALLOC_FREE(subreq);
+
+	subreq = cli_close_send(state, state->ev, state->cli, state->fnum);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq, cli_readlink_closed, req);
+}
+
+static void cli_readlink_closed(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	NTSTATUS status;
+
+	status = cli_close_recv(subreq);
+	TALLOC_FREE(subreq);
+	if (tevent_req_nterror(req, status)) {
+		return;
+	}
+	tevent_req_done(req);
+}
+
+NTSTATUS cli_readlink_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+			   char **psubstitute_name, char **pprint_name,
+			   uint32_t *pflags)
+{
+	struct cli_readlink_state *state = tevent_req_data(
+		req, struct cli_readlink_state);
+	NTSTATUS status;
+	char *substitute_name;
+	char *print_name;
+	uint32_t flags;
+
+	if (tevent_req_is_nterror(req, &status)) {
+		return status;
+	}
+
+	if (!symlink_reparse_buffer_parse(state->data, state->num_data,
+					  talloc_tos(), &substitute_name,
+					  &print_name, &flags)) {
+		return NT_STATUS_INVALID_NETWORK_RESPONSE;
+	}
+
+	if (psubstitute_name != NULL) {
+		*psubstitute_name = talloc_move(mem_ctx, &substitute_name);
+	}
+	TALLOC_FREE(substitute_name);
+
+	if (pprint_name != NULL) {
+		*pprint_name = talloc_move(mem_ctx, &print_name);
+	}
+	TALLOC_FREE(print_name);
+
+	if (pflags != NULL) {
+		*pflags = flags;
+	}
+	return NT_STATUS_OK;
+}
+
+NTSTATUS cli_readlink(struct cli_state *cli, const char *fname,
+		       TALLOC_CTX *mem_ctx, char **psubstitute_name,
+		      char **pprint_name, uint32_t *pflags)
+{
+	TALLOC_CTX *frame = talloc_stackframe();
+	struct event_context *ev;
+	struct tevent_req *req;
+	NTSTATUS status = NT_STATUS_NO_MEMORY;
+
+	if (cli_has_async_calls(cli)) {
+		status = NT_STATUS_INVALID_PARAMETER;
+		goto fail;
+	}
+	ev = event_context_init(frame);
+	if (ev == NULL) {
+		goto fail;
+	}
+	req = cli_readlink_send(frame, ev, cli, fname);
+	if (req == NULL) {
+		goto fail;
+	}
+	if (!tevent_req_poll_ntstatus(req, ev, &status)) {
+		goto fail;
+	}
+	status = cli_readlink_recv(req, mem_ctx, psubstitute_name,
+				   pprint_name, pflags);
+ fail:
+	TALLOC_FREE(frame);
+	return status;
+}