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facc110c79
We need to use talloc_reference() if there're more than one response, but we use it in a way that the caller can't call talloc_free() or talloc_unlink() on it. metze
165 lines
4.2 KiB
C
165 lines
4.2 KiB
C
/*
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Unix SMB/CIFS implementation.
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smb2 lib
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Copyright (C) Volker Lendecke 2011
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "client.h"
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#include "async_smb.h"
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#include "smb2cli_base.h"
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#include "smb2cli.h"
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#include "libsmb/proto.h"
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#include "lib/util/tevent_ntstatus.h"
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struct smb2cli_read_state {
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uint8_t fixed[48];
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struct iovec *recv_iov;
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uint8_t *data;
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uint32_t data_length;
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};
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static void smb2cli_read_done(struct tevent_req *subreq);
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struct tevent_req *smb2cli_read_send(TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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struct cli_state *cli,
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uint32_t length,
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uint64_t offset,
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uint64_t fid_persistent,
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uint64_t fid_volatile,
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uint64_t minimum_count,
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uint64_t remaining_bytes)
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{
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struct tevent_req *req, *subreq;
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struct smb2cli_read_state *state;
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uint8_t *fixed;
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req = tevent_req_create(mem_ctx, &state,
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struct smb2cli_read_state);
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if (req == NULL) {
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return NULL;
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}
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fixed = state->fixed;
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SSVAL(fixed, 0, 49);
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SIVAL(fixed, 4, length);
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SBVAL(fixed, 8, offset);
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SBVAL(fixed, 16, fid_persistent);
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SBVAL(fixed, 24, fid_volatile);
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SBVAL(fixed, 32, minimum_count);
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SBVAL(fixed, 40, remaining_bytes);
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subreq = smb2cli_req_send(state, ev, cli, SMB2_OP_READ, 0,
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state->fixed, sizeof(state->fixed),
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NULL, 0);
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if (tevent_req_nomem(subreq, req)) {
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return tevent_req_post(req, ev);
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}
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tevent_req_set_callback(subreq, smb2cli_read_done, req);
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return req;
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}
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static void smb2cli_read_done(struct tevent_req *subreq)
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{
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struct tevent_req *req = tevent_req_callback_data(
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subreq, struct tevent_req);
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struct smb2cli_read_state *state =
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tevent_req_data(req,
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struct smb2cli_read_state);
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NTSTATUS status;
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struct iovec *iov;
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uint8_t data_offset;
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status = smb2cli_req_recv(subreq, state, &iov, 17);
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if (tevent_req_nterror(req, status)) {
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return;
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}
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data_offset = CVAL(iov[1].iov_base, 2);
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state->data_length = IVAL(iov[1].iov_base, 4);
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if ((data_offset != SMB2_HDR_BODY + 16) ||
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(state->data_length > iov[2].iov_len)) {
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tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
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return;
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}
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state->recv_iov = iov;
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state->data = (uint8_t *)iov[2].iov_base;
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tevent_req_done(req);
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}
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NTSTATUS smb2cli_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
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uint8_t **data, uint32_t *data_length)
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{
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struct smb2cli_read_state *state =
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tevent_req_data(req,
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struct smb2cli_read_state);
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NTSTATUS status;
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if (tevent_req_is_nterror(req, &status)) {
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return status;
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}
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talloc_steal(mem_ctx, state->recv_iov);
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*data_length = state->data_length;
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*data = state->data;
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return NT_STATUS_OK;
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}
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NTSTATUS smb2cli_read(struct cli_state *cli,
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uint32_t length,
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uint64_t offset,
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uint64_t fid_persistent,
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uint64_t fid_volatile,
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uint64_t minimum_count,
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uint64_t remaining_bytes,
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TALLOC_CTX *mem_ctx,
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uint8_t **data,
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uint32_t *data_length)
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{
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TALLOC_CTX *frame = talloc_stackframe();
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struct event_context *ev;
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struct tevent_req *req;
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NTSTATUS status = NT_STATUS_NO_MEMORY;
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if (cli_has_async_calls(cli)) {
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/*
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* Can't use sync call while an async call is in flight
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*/
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status = NT_STATUS_INVALID_PARAMETER;
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goto fail;
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}
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ev = event_context_init(frame);
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if (ev == NULL) {
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goto fail;
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}
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req = smb2cli_read_send(frame, ev, cli, length, offset,
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fid_persistent, fid_volatile,
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minimum_count, remaining_bytes);
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if (req == NULL) {
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goto fail;
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}
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if (!tevent_req_poll_ntstatus(req, ev, &status)) {
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goto fail;
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}
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status = smb2cli_read_recv(req, mem_ctx, data, data_length);
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fail:
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TALLOC_FREE(frame);
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return status;
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}
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