--- /dev/null
+/*
+ Unix SMB/CIFS implementation.
+
+ Copyright (C) Gregor Beck 2013
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "system/network.h"
+#include "lib/util/tevent_ntstatus.h"
+#include "smb_common.h"
+#include "smbXcli_base.h"
+
+struct smb1cli_readx_state {
+ uint32_t size;
+ uint16_t vwv[12];
+ NTSTATUS status;
+ uint32_t received;
+ uint8_t *buf;
+};
+
+static void smb1cli_readx_done(struct tevent_req *subreq);
+
+/**
+ * Send an asynchrounus SMB_COM_READ_ANDX request.
+ * <a href="http://msdn.microsoft.com/en-us/library/ee441839.aspx">MS-CIFS 2.2.4.42.1</a>,
+ * <a href="http://msdn.microsoft.com/en-us/library/ff470250.aspx">MS-SMB 2.2.4.2.1</a>
+ * @see smb1cli_readx_recv()
+ * @todo fix API (min/max size, timeout)
+ *
+ * @param[in] mem_ctx The memory context for the result.
+ * @param[in] ev The event context to work on.
+ * @param[in] conn The smb connection.
+ * @param[in] timeout_msec If positiv a timeout for the request.
+ * @param[in] pid The process identifier
+ * @param[in] tcon The smb tree connect.
+ * @param[in] session The smb session.
+ * @param[in] fnum The file id of the file the data should be read from.
+ * @param[in] offset The offset in bytes from the begin of file where to start reading.
+ * @param[in] size The number of bytes to read.
+ *
+ * @return a tevent_req or NULL
+ */
+struct tevent_req *smb1cli_readx_send(TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev,
+ struct smbXcli_conn *conn,
+ uint32_t timeout_msec,
+ uint32_t pid,
+ struct smbXcli_tcon *tcon,
+ struct smbXcli_session *session,
+ uint16_t fnum,
+ uint64_t offset,
+ uint32_t size)
+{
+ NTSTATUS status;
+ struct tevent_req *req, *subreq;
+ struct smb1cli_readx_state *state;
+ uint8_t wct = 10;
+
+ req = tevent_req_create(mem_ctx, &state, struct smb1cli_readx_state);
+ if (req == NULL) {
+ return NULL;
+ }
+ state->size = size;
+
+ SCVAL(state->vwv + 0, 0, 0xFF);
+ SCVAL(state->vwv + 0, 1, 0);
+ SSVAL(state->vwv + 1, 0, 0);
+ SSVAL(state->vwv + 2, 0, fnum);
+ SIVAL(state->vwv + 3, 0, offset);
+ SSVAL(state->vwv + 5, 0, size);
+ SSVAL(state->vwv + 6, 0, size);
+ SSVAL(state->vwv + 7, 0, (size >> 16));
+ SSVAL(state->vwv + 8, 0, 0);
+ SSVAL(state->vwv + 9, 0, 0);
+
+ if (smb1cli_conn_capabilities(conn) & CAP_LARGE_FILES) {
+ SIVAL(state->vwv + 10, 0,
+ (((uint64_t)offset)>>32) & 0xffffffff);
+ wct = 12;
+ } else {
+ if ((((uint64_t)offset) & 0xffffffff00000000LL) != 0) {
+ DEBUG(10, ("smb1cli_readx_send got large offset where "
+ "the server does not support it\n"));
+ tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
+ return tevent_req_post(req, ev);
+ }
+ }
+
+ subreq = smb1cli_req_create(state, ev, conn, SMBreadX,
+ 0, 0, /* *_flags */
+ 0, 0, /* *_flags2 */
+ timeout_msec, pid, tcon, session,
+ wct, state->vwv,
+ 0, NULL);
+ if (tevent_req_nomem(subreq, req)) {
+ return tevent_req_post(req, ev);
+ }
+ tevent_req_set_callback(subreq, smb1cli_readx_done, req);
+
+ status = smb1cli_req_chain_submit(&subreq, 1);
+ if (tevent_req_nterror(req, status)) {
+ return tevent_req_post(req, ev);
+ }
+
+ return req;
+}
+
+static void smb1cli_readx_done(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct smb1cli_readx_state *state = tevent_req_data(
+ req, struct smb1cli_readx_state);
+ struct iovec *recv_iov = NULL;
+ uint8_t wct;
+ uint16_t *vwv;
+ uint32_t num_bytes;
+ uint8_t *bytes;
+ uint16_t data_offset;
+ uint32_t bytes_offset;
+ static const struct smb1cli_req_expected_response expected[] = {
+ {
+ .status = NT_STATUS_OK,
+ .wct = 0x0C
+ },
+ };
+
+ state->status = smb1cli_req_recv(subreq, state,
+ &recv_iov,
+ NULL, /* phdr */
+ &wct,
+ &vwv,
+ NULL, /* pvwv_offset */
+ &num_bytes,
+ &bytes,
+ &bytes_offset,
+ NULL, /* inbuf */
+ expected, ARRAY_SIZE(expected));
+ TALLOC_FREE(subreq);
+ if (tevent_req_nterror(req, state->status)) {
+ return;
+ }
+
+ /* size is the number of bytes the server returned.
+ * Might be zero. */
+ state->received = SVAL(vwv + 5, 0);
+ state->received |= (((unsigned int)SVAL(vwv + 7, 0)) << 16);
+
+ if (state->received > state->size) {
+ DEBUG(5,("server returned more than we wanted!\n"));
+ tevent_req_nterror(req, NT_STATUS_UNEXPECTED_IO_ERROR);
+ return;
+ }
+
+ /*
+ * bcc field must be valid for small reads, for large reads the 16-bit
+ * bcc field can't be correct.
+ */
+ if ((state->received < 0xffff) && (state->received > num_bytes)) {
+ DEBUG(5, ("server announced more bytes than sent\n"));
+ tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
+ return;
+ }
+
+ data_offset = SVAL(vwv+6, 0);
+ if (data_offset < bytes_offset) {
+ DEBUG(5, ("server returned invalid read&x data offset\n"));
+ tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
+ return;
+ }
+ if (smb_buffer_oob(num_bytes, data_offset - bytes_offset, state->received)) {
+ DEBUG(5, ("server returned invalid read&x data offset\n"));
+ tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
+ return;
+ }
+
+ state->buf = bytes + (data_offset - bytes_offset);
+
+ tevent_req_done(req);
+}
+
+/**
+ * Receive the response to an asynchronous SMB_COM_READ_ANDX request.
+ * <a href="http://msdn.microsoft.com/en-us/library/ee441872.aspx">MS-CIFS 2.2.4.42.2</a>,
+ * <a href="http://msdn.microsoft.com/en-us/library/ff470017.aspx">MS-SMB 2.2.4.2.2</a>
+ *
+ * @warning rcvbuf is talloced from the request, so better make sure that you
+ * copy it away before you talloc_free(req). rcvbuf is NOT a talloc_ctx of its
+ * own, so do not talloc_move it!
+ *
+ * @param[in] req A tevent request created with smb1cli_readx_send()
+ * @param[out] received The number of bytes received.
+ * @param[out] rcvbuf Pointer to the bytes received.
+ *
+ * @return NT_STATUS_OK on succsess.
+ */
+NTSTATUS smb1cli_readx_recv(struct tevent_req *req,
+ uint32_t *received,
+ uint8_t **rcvbuf)
+{
+ struct smb1cli_readx_state *state = tevent_req_data(
+ req, struct smb1cli_readx_state);
+ NTSTATUS status;
+
+ if (tevent_req_is_nterror(req, &status)) {
+ return status;
+ }
+ *received = state->received;
+ *rcvbuf = state->buf;
+ return NT_STATUS_OK;
+}
git.samba.org / metze / samba / wip.git / commitdiff