/* Unix SMB/CIFS implementation. smb2 lib Copyright (C) Volker Lendecke 2011 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 "client.h" #include "async_smb.h" #include "smb2cli_base.h" #include "smb2cli.h" #include "libsmb/proto.h" #include "lib/util/tevent_ntstatus.h" struct smb2cli_read_state { uint8_t fixed[48]; uint8_t *inbuf; uint8_t *data; uint32_t data_length; }; static void smb2cli_read_done(struct tevent_req *subreq); struct tevent_req *smb2cli_read_send(TALLOC_CTX *mem_ctx, struct tevent_context *ev, struct cli_state *cli, uint32_t length, uint64_t offset, uint64_t fid_persistent, uint64_t fid_volatile, uint64_t minimum_count, uint64_t remaining_bytes) { struct tevent_req *req, *subreq; struct smb2cli_read_state *state; uint8_t *fixed; req = tevent_req_create(mem_ctx, &state, struct smb2cli_read_state); if (req == NULL) { return NULL; } fixed = state->fixed; SSVAL(fixed, 0, 49); SIVAL(fixed, 4, length); SBVAL(fixed, 8, offset); SBVAL(fixed, 16, fid_persistent); SBVAL(fixed, 24, fid_volatile); SBVAL(fixed, 32, minimum_count); SBVAL(fixed, 40, remaining_bytes); subreq = smb2cli_req_send(state, ev, cli, SMB2_OP_READ, 0, state->fixed, sizeof(state->fixed), NULL, 0); if (tevent_req_nomem(subreq, req)) { return tevent_req_post(req, ev); } tevent_req_set_callback(subreq, smb2cli_read_done, req); return req; } static void smb2cli_read_done(struct tevent_req *subreq) { struct tevent_req *req = tevent_req_callback_data( subreq, struct tevent_req); struct smb2cli_read_state *state = tevent_req_data(req, struct smb2cli_read_state); NTSTATUS status; struct iovec *iov; uint8_t data_offset; status = smb2cli_req_recv(subreq, talloc_tos(), &iov, 17); if (tevent_req_nterror(req, status)) { return; } data_offset = CVAL(iov[1].iov_base, 2); state->data_length = IVAL(iov[1].iov_base, 4); if ((data_offset != SMB2_HDR_BODY + 16) || (state->data_length > iov[2].iov_len)) { tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); return; } state->inbuf = smb2cli_req_inbuf(subreq); state->data = (uint8_t *)iov[2].iov_base; tevent_req_done(req); } NTSTATUS smb2cli_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx, uint8_t **data, uint32_t *data_length) { struct smb2cli_read_state *state = tevent_req_data(req, struct smb2cli_read_state); NTSTATUS status; if (tevent_req_is_nterror(req, &status)) { return status; } talloc_steal(mem_ctx, state->inbuf); *data_length = state->data_length; *data = state->data; return NT_STATUS_OK; } NTSTATUS smb2cli_read(struct cli_state *cli, uint32_t length, uint64_t offset, uint64_t fid_persistent, uint64_t fid_volatile, uint64_t minimum_count, uint64_t remaining_bytes, TALLOC_CTX *mem_ctx, uint8_t **data, uint32_t *data_length) { 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)) { /* * Can't use sync call while an async call is in flight */ status = NT_STATUS_INVALID_PARAMETER; goto fail; } ev = event_context_init(frame); if (ev == NULL) { goto fail; } req = smb2cli_read_send(frame, ev, cli, length, offset, fid_persistent, fid_volatile, minimum_count, remaining_bytes); if (req == NULL) { goto fail; } if (!tevent_req_poll_ntstatus(req, ev, &status)) { goto fail; } status = smb2cli_read_recv(req, mem_ctx, data, data_length); fail: TALLOC_FREE(frame); return status; }