diff options
Diffstat (limited to 'libcli/util/tstream.c')
| -rw-r--r-- | libcli/util/tstream.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/libcli/util/tstream.c b/libcli/util/tstream.c new file mode 100644 index 0000000..dd830e2 --- /dev/null +++ b/libcli/util/tstream.c @@ -0,0 +1,177 @@ +/* + * Unix SMB/CIFS implementation. + * + * Copyright (C) Stefan Metzmacher 2009 + * + * 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 <tevent.h> +#include "system/filesys.h" +#include "system/network.h" +#include "../lib/tsocket/tsocket.h" +#include "../libcli/util/tstream.h" +#include "../lib/util/tevent_ntstatus.h" + +struct tstream_read_pdu_blob_state { + /* this structs are owned by the caller */ + struct { + struct tevent_context *ev; + struct tstream_context *stream; + tstream_read_pdu_blob_full_fn_t *full_fn; + void *full_private; + } caller; + + DATA_BLOB pdu_blob; + struct iovec tmp_vector; +}; + +static void tstream_read_pdu_blob_done(struct tevent_req *subreq); + +struct tevent_req *tstream_read_pdu_blob_send(TALLOC_CTX *mem_ctx, + struct tevent_context *ev, + struct tstream_context *stream, + size_t initial_read_size, + tstream_read_pdu_blob_full_fn_t *full_fn, + void *full_private) +{ + struct tevent_req *req; + struct tstream_read_pdu_blob_state *state; + struct tevent_req *subreq; + uint8_t *buf; + + req = tevent_req_create(mem_ctx, &state, + struct tstream_read_pdu_blob_state); + if (!req) { + return NULL; + } + + state->caller.ev = ev; + state->caller.stream = stream; + state->caller.full_fn = full_fn; + state->caller.full_private = full_private; + + if (initial_read_size == 0) { + tevent_req_error(req, EINVAL); + return tevent_req_post(req, ev); + } + + buf = talloc_array(state, uint8_t, initial_read_size); + if (tevent_req_nomem(buf, req)) { + return tevent_req_post(req, ev); + } + state->pdu_blob.data = buf; + state->pdu_blob.length = initial_read_size; + + state->tmp_vector.iov_base = (char *) buf; + state->tmp_vector.iov_len = initial_read_size; + + subreq = tstream_readv_send(state, ev, stream, &state->tmp_vector, 1); + if (tevent_req_nomem(subreq, req)) { + return tevent_req_post(req, ev); + } + tevent_req_set_callback(subreq, tstream_read_pdu_blob_done, req); + + return req; +} + +static void tstream_read_pdu_blob_done(struct tevent_req *subreq) +{ + struct tevent_req *req = + tevent_req_callback_data(subreq, + struct tevent_req); + struct tstream_read_pdu_blob_state *state = + tevent_req_data(req, + struct tstream_read_pdu_blob_state); + ssize_t ret; + int sys_errno; + size_t old_buf_size = state->pdu_blob.length; + size_t new_buf_size = 0; + size_t pdu_size = 0; + NTSTATUS status; + uint8_t *buf; + + ret = tstream_readv_recv(subreq, &sys_errno); + TALLOC_FREE(subreq); + if (ret == -1) { + status = map_nt_error_from_unix_common(sys_errno); + tevent_req_nterror(req, status); + return; + } + + status = state->caller.full_fn(state->caller.full_private, + state->pdu_blob, &pdu_size); + if (NT_STATUS_IS_OK(status)) { + tevent_req_done(req); + return; + } else if (NT_STATUS_EQUAL(status, STATUS_MORE_ENTRIES)) { + /* more to get */ + if (pdu_size > 0) { + new_buf_size = pdu_size; + } else { + /* we don't know the size yet, so get one more byte */ + new_buf_size = old_buf_size + 1; + } + } else if (!NT_STATUS_IS_OK(status)) { + tevent_req_nterror(req, status); + return; + } + + if (new_buf_size <= old_buf_size) { + tevent_req_nterror(req, NT_STATUS_INVALID_BUFFER_SIZE); + return; + } + + buf = talloc_realloc(state, state->pdu_blob.data, uint8_t, new_buf_size); + if (tevent_req_nomem(buf, req)) { + return; + } + state->pdu_blob.data = buf; + state->pdu_blob.length = new_buf_size; + + state->tmp_vector.iov_base = (char *) (buf + old_buf_size); + state->tmp_vector.iov_len = new_buf_size - old_buf_size; + + subreq = tstream_readv_send(state, + state->caller.ev, + state->caller.stream, + &state->tmp_vector, + 1); + if (tevent_req_nomem(subreq, req)) { + return; + } + tevent_req_set_callback(subreq, tstream_read_pdu_blob_done, req); +} + +NTSTATUS tstream_read_pdu_blob_recv(struct tevent_req *req, + TALLOC_CTX *mem_ctx, + DATA_BLOB *pdu_blob) +{ + struct tstream_read_pdu_blob_state *state = tevent_req_data(req, + struct tstream_read_pdu_blob_state); + NTSTATUS status; + + if (tevent_req_is_nterror(req, &status)) { + tevent_req_received(req); + return status; + } + + *pdu_blob = state->pdu_blob; + talloc_steal(mem_ctx, pdu_blob->data); + + tevent_req_received(req); + return NT_STATUS_OK; +} + |