#include "includes.h"
-/****************************************************************************
- Calculate the recommended read buffer size
-****************************************************************************/
-static size_t cli_read_max_bufsize(struct cli_state *cli)
-{
- if (!client_is_signing_on(cli) && !cli_encryption_on(cli) == false
- && (cli->posix_capabilities & CIFS_UNIX_LARGE_READ_CAP)) {
- return CLI_SAMBA_MAX_POSIX_LARGE_READX_SIZE;
- }
- if (cli->capabilities & CAP_LARGE_READX) {
- return cli->is_samba
- ? CLI_SAMBA_MAX_LARGE_READX_SIZE
- : CLI_WINDOWS_MAX_LARGE_READX_SIZE;
- }
- return (cli->max_xmit - (smb_size+32)) & ~1023;
-}
-
-/*
- * Send a read&x request
- */
-
-struct async_req *cli_read_andx_send(TALLOC_CTX *mem_ctx,
- struct cli_state *cli, int fnum,
- off_t offset, size_t size)
-{
- struct async_req *result;
- struct cli_request *req;
- bool bigoffset = False;
- char *enc_buf;
-
- if (size > cli_read_max_bufsize(cli)) {
- DEBUG(0, ("cli_read_andx_send got size=%d, can only handle "
- "size=%d\n", (int)size,
- (int)cli_read_max_bufsize(cli)));
- return NULL;
- }
-
- result = cli_request_new(mem_ctx, cli->event_ctx, cli, 12, 0, &req);
- if (result == NULL) {
- DEBUG(0, ("cli_request_new failed\n"));
- return NULL;
- }
-
- req = cli_request_get(result);
-
- req->data.read.ofs = offset;
- req->data.read.size = size;
- req->data.read.received = 0;
- req->data.read.rcvbuf = NULL;
-
- if ((SMB_BIG_UINT)offset >> 32)
- bigoffset = True;
-
- cli_set_message(req->outbuf, bigoffset ? 12 : 10, 0, False);
-
- SCVAL(req->outbuf,smb_com,SMBreadX);
- SSVAL(req->outbuf,smb_tid,cli->cnum);
- cli_setup_packet_buf(cli, req->outbuf);
-
- SCVAL(req->outbuf,smb_vwv0,0xFF);
- SCVAL(req->outbuf,smb_vwv0+1,0);
- SSVAL(req->outbuf,smb_vwv1,0);
- SSVAL(req->outbuf,smb_vwv2,fnum);
- SIVAL(req->outbuf,smb_vwv3,offset);
- SSVAL(req->outbuf,smb_vwv5,size);
- SSVAL(req->outbuf,smb_vwv6,size);
- SSVAL(req->outbuf,smb_vwv7,(size >> 16));
- SSVAL(req->outbuf,smb_vwv8,0);
- SSVAL(req->outbuf,smb_vwv9,0);
- SSVAL(req->outbuf,smb_mid,req->mid);
-
- if (bigoffset) {
- SIVAL(req->outbuf, smb_vwv10,
- (((SMB_BIG_UINT)offset)>>32) & 0xffffffff);
- }
-
- cli_calculate_sign_mac(cli, req->outbuf);
-
- event_fd_set_writeable(cli->fd_event);
-
- if (cli_encryption_on(cli)) {
- NTSTATUS status;
- status = cli_encrypt_message(cli, req->outbuf, &enc_buf);
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(0, ("Error in encrypting client message. "
- "Error %s\n", nt_errstr(status)));
- TALLOC_FREE(req);
- return NULL;
- }
- req->outbuf = enc_buf;
- req->enc_state = cli->trans_enc_state;
- }
-
- return result;
-}
-
-/*
- * Pull the data out of a finished async read_and_x request. 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!
- */
-
-NTSTATUS cli_read_andx_recv(struct async_req *req, ssize_t *received,
- uint8_t **rcvbuf)
-{
- struct cli_request *cli_req = cli_request_get(req);
- NTSTATUS status;
- size_t size;
-
- SMB_ASSERT(req->state >= ASYNC_REQ_DONE);
- if (req->state == ASYNC_REQ_ERROR) {
- return req->status;
- }
-
- status = cli_pull_error(cli_req->inbuf);
-
- if (!NT_STATUS_IS_OK(status)) {
- return status;
- }
-
- /* size is the number of bytes the server returned.
- * Might be zero. */
- size = SVAL(cli_req->inbuf, smb_vwv5);
- size |= (((unsigned int)(SVAL(cli_req->inbuf, smb_vwv7))) << 16);
-
- if (size > cli_req->data.read.size) {
- DEBUG(5,("server returned more than we wanted!\n"));
- return NT_STATUS_UNEXPECTED_IO_ERROR;
- }
-
- if (size < 0) {
- DEBUG(5,("read return < 0!\n"));
- return NT_STATUS_UNEXPECTED_IO_ERROR;
- }
-
- *rcvbuf = (uint8_t *)
- (smb_base(cli_req->inbuf) + SVAL(cli_req->inbuf, smb_vwv6));
- *received = size;
- return NT_STATUS_OK;
-}
-
-/*
- * Parallel read support.
- *
- * cli_pull sends as many read&x requests as the server would allow via
- * max_mux at a time. When replies flow back in, the data is written into
- * the callback function "sink" in the right order.
- */
-
-struct cli_pull_state {
- struct async_req *req;
-
- struct cli_state *cli;
- uint16_t fnum;
- off_t start_offset;
- size_t size;
-
- NTSTATUS (*sink)(char *buf, size_t n, void *priv);
- void *priv;
-
- size_t chunk_size;
-
- /*
- * Outstanding requests
- */
- int num_reqs;
- struct async_req **reqs;
-
- /*
- * For how many bytes did we send requests already?
- */
- off_t requested;
-
- /*
- * Next request index to push into "sink". This walks around the "req"
- * array, taking care that the requests are pushed to "sink" in the
- * right order. If necessary (i.e. replies don't come in in the right
- * order), replies are held back in "reqs".
- */
- int top_req;
-
- /*
- * How many bytes did we push into "sink"?
- */
-
- off_t pushed;
-};
-
-static char *cli_pull_print(TALLOC_CTX *mem_ctx, struct async_req *req)
-{
- struct cli_pull_state *state = talloc_get_type_abort(
- req->private_data, struct cli_pull_state);
- char *result;
-
- result = async_req_print(mem_ctx, req);
- if (result == NULL) {
- return NULL;
- }
-
- return talloc_asprintf_append_buffer(
- result, "num_reqs=%d, top_req=%d",
- state->num_reqs, state->top_req);
-}
-
-static void cli_pull_read_done(struct async_req *read_req);
-
-/*
- * Prepare an async pull request
- */
-
-struct async_req *cli_pull_send(TALLOC_CTX *mem_ctx, struct cli_state *cli,
- uint16_t fnum, off_t start_offset,
- size_t size, size_t window_size,
- NTSTATUS (*sink)(char *buf, size_t n,
- void *priv),
- void *priv)
-{
- struct async_req *result;
- struct cli_pull_state *state;
- int i;
-
- result = async_req_new(mem_ctx, cli->event_ctx);
- if (result == NULL) {
- goto failed;
- }
- state = talloc(result, struct cli_pull_state);
- if (state == NULL) {
- goto failed;
- }
- result->private_data = state;
- result->print = cli_pull_print;
- state->req = result;
-
- state->cli = cli;
- state->fnum = fnum;
- state->start_offset = start_offset;
- state->size = size;
- state->sink = sink;
- state->priv = priv;
-
- state->pushed = 0;
- state->top_req = 0;
- state->chunk_size = cli_read_max_bufsize(cli);
-
- state->num_reqs = MAX(window_size/state->chunk_size, 1);
- state->num_reqs = MIN(state->num_reqs, cli->max_mux);
-
- state->reqs = TALLOC_ZERO_ARRAY(state, struct async_req *,
- state->num_reqs);
- if (state->reqs == NULL) {
- goto failed;
- }
-
- state->requested = 0;
-
- for (i=0; i<state->num_reqs; i++) {
- size_t size_left, request_thistime;
-
- if (state->requested >= size) {
- state->num_reqs = i;
- break;
- }
-
- size_left = size - state->requested;
- request_thistime = MIN(size_left, state->chunk_size);
-
- state->reqs[i] = cli_read_andx_send(
- state->reqs, cli, fnum,
- state->start_offset + state->requested,
- request_thistime);
-
- if (state->reqs[i] == NULL) {
- goto failed;
- }
-
- state->reqs[i]->async.fn = cli_pull_read_done;
- state->reqs[i]->async.priv = result;
-
- state->requested += request_thistime;
- }
- return result;
-
-failed:
- TALLOC_FREE(result);
- return NULL;
-}
-
-/*
- * Handle incoming read replies, push the data into sink and send out new
- * requests if necessary.
- */
-
-static void cli_pull_read_done(struct async_req *read_req)
-{
- struct async_req *pull_req = talloc_get_type_abort(
- read_req->async.priv, struct async_req);
- struct cli_pull_state *state = talloc_get_type_abort(
- pull_req->private_data, struct cli_pull_state);
- struct cli_request *read_state = cli_request_get(read_req);
- NTSTATUS status;
-
- status = cli_read_andx_recv(read_req, &read_state->data.read.received,
- &read_state->data.read.rcvbuf);
- if (!NT_STATUS_IS_OK(status)) {
- async_req_error(state->req, status);
- return;
- }
-
- /*
- * This loop is the one to take care of out-of-order replies. All
- * pending requests are in state->reqs, state->reqs[top_req] is the
- * one that is to be pushed next. If however a request later than
- * top_req is replied to, then we can't push yet. If top_req is
- * replied to at a later point then, we need to push all the finished
- * requests.
- */
-
- while (state->reqs[state->top_req] != NULL) {
- struct cli_request *top_read;
-
- DEBUG(11, ("cli_pull_read_done: top_req = %d\n",
- state->top_req));
-
- if (state->reqs[state->top_req]->state < ASYNC_REQ_DONE) {
- DEBUG(11, ("cli_pull_read_done: top request not yet "
- "done\n"));
- return;
- }
-
- top_read = cli_request_get(state->reqs[state->top_req]);
-
- DEBUG(10, ("cli_pull_read_done: Pushing %d bytes, %d already "
- "pushed\n", (int)top_read->data.read.received,
- (int)state->pushed));
-
- status = state->sink((char *)top_read->data.read.rcvbuf,
- top_read->data.read.received,
- state->priv);
- if (!NT_STATUS_IS_OK(status)) {
- async_req_error(state->req, status);
- return;
- }
- state->pushed += top_read->data.read.received;
-
- TALLOC_FREE(state->reqs[state->top_req]);
-
- if (state->requested < state->size) {
- struct async_req *new_req;
- size_t size_left, request_thistime;
-
- size_left = state->size - state->requested;
- request_thistime = MIN(size_left, state->chunk_size);
-
- DEBUG(10, ("cli_pull_read_done: Requesting %d bytes "
- "at %d, position %d\n",
- (int)request_thistime,
- (int)(state->start_offset
- + state->requested),
- state->top_req));
-
- new_req = cli_read_andx_send(
- state->reqs, state->cli, state->fnum,
- state->start_offset + state->requested,
- request_thistime);
-
- if (async_req_nomem(new_req, state->req)) {
- return;
- }
-
- new_req->async.fn = cli_pull_read_done;
- new_req->async.priv = pull_req;
-
- state->reqs[state->top_req] = new_req;
- state->requested += request_thistime;
- }
-
- state->top_req = (state->top_req+1) % state->num_reqs;
- }
-
- async_req_done(pull_req);
-}
-
-NTSTATUS cli_pull_recv(struct async_req *req, ssize_t *received)
-{
- struct cli_pull_state *state = talloc_get_type_abort(
- req->private_data, struct cli_pull_state);
-
- SMB_ASSERT(req->state >= ASYNC_REQ_DONE);
- if (req->state == ASYNC_REQ_ERROR) {
- return req->status;
- }
- *received = state->pushed;
- return NT_STATUS_OK;
-}
-
-NTSTATUS cli_pull(struct cli_state *cli, uint16_t fnum,
- off_t start_offset, size_t size, size_t window_size,
- NTSTATUS (*sink)(char *buf, size_t n, void *priv),
- void *priv, ssize_t *received)
-{
- TALLOC_CTX *frame = talloc_stackframe();
- struct async_req *req;
- NTSTATUS result = NT_STATUS_NO_MEMORY;
-
- if (cli_tmp_event_ctx(frame, cli) == NULL) {
- goto nomem;
- }
-
- req = cli_pull_send(frame, cli, fnum, start_offset, size, window_size,
- sink, priv);
- if (req == NULL) {
- goto nomem;
- }
-
- while (req->state < ASYNC_REQ_DONE) {
- event_loop_once(cli->event_ctx);
- }
-
- result = cli_pull_recv(req, received);
- nomem:
- TALLOC_FREE(frame);
- return result;
-}
-
/****************************************************************************
Issue a single SMBread and don't wait for a reply.
****************************************************************************/
git.samba.org / samba.git / commitdiff