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|
/*
Unix SMB/CIFS implementation.
client file read/write routines
Copyright (C) Andrew Tridgell 1994-1998
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"
/****************************************************************************
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)
&& (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_ERR(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;
if (size == 0) {
if (!async_post_status(result, NT_STATUS_OK)) {
goto failed;
}
return result;
}
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;
}
static NTSTATUS cli_read_sink(char *buf, size_t n, void *priv)
{
char **pbuf = (char **)priv;
memcpy(*pbuf, buf, n);
*pbuf += n;
return NT_STATUS_OK;
}
ssize_t cli_read(struct cli_state *cli, int fnum, char *buf,
off_t offset, size_t size)
{
NTSTATUS status;
ssize_t ret;
status = cli_pull(cli, fnum, offset, size, size,
cli_read_sink, &buf, &ret);
if (!NT_STATUS_IS_OK(status)) {
cli_set_error(cli, status);
return -1;
}
return ret;
}
#if 0 /* relies on client_receive_smb(), now a static in libsmb/clientgen.c */
/* This call is INCOMPATIBLE with SMB signing. If you remove the #if 0
you must fix ensure you don't attempt to sign the packets - data
*will* be currupted */
/****************************************************************************
Issue a single SMBreadraw and don't wait for a reply.
****************************************************************************/
static bool cli_issue_readraw(struct cli_state *cli, int fnum, off_t offset,
size_t size, int i)
{
if (!cli->sign_info.use_smb_signing) {
DEBUG(0, ("Cannot use readraw and SMB Signing\n"));
return False;
}
memset(cli->outbuf,'\0',smb_size);
memset(cli->inbuf,'\0',smb_size);
cli_set_message(cli->outbuf,10,0,True);
SCVAL(cli->outbuf,smb_com,SMBreadbraw);
SSVAL(cli->outbuf,smb_tid,cli->cnum);
cli_setup_packet(cli);
SSVAL(cli->outbuf,smb_vwv0,fnum);
SIVAL(cli->outbuf,smb_vwv1,offset);
SSVAL(cli->outbuf,smb_vwv2,size);
SSVAL(cli->outbuf,smb_vwv3,size);
SSVAL(cli->outbuf,smb_mid,cli->mid + i);
return cli_send_smb(cli);
}
/****************************************************************************
Tester for the readraw call.
****************************************************************************/
ssize_t cli_readraw(struct cli_state *cli, int fnum, char *buf, off_t offset, size_t size)
{
char *p;
int size2;
size_t readsize;
ssize_t total = 0;
if (size == 0)
return 0;
/*
* Set readsize to the maximum size we can handle in one readraw.
*/
readsize = 0xFFFF;
while (total < size) {
readsize = MIN(readsize, size-total);
/* Issue a read and receive a reply */
if (!cli_issue_readraw(cli, fnum, offset, readsize, 0))
return -1;
if (!client_receive_smb(cli->fd, cli->inbuf, cli->timeout))
return -1;
size2 = smb_len(cli->inbuf);
if (size2 > readsize) {
DEBUG(5,("server returned more than we wanted!\n"));
return -1;
} else if (size2 < 0) {
DEBUG(5,("read return < 0!\n"));
return -1;
}
/* Copy data into buffer */
if (size2) {
p = cli->inbuf + 4;
memcpy(buf + total, p, size2);
}
total += size2;
offset += size2;
/*
* If the server returned less than we asked for we're at EOF.
*/
if (size2 < readsize)
break;
}
return total;
}
#endif
/****************************************************************************
Issue a single SMBwrite and don't wait for a reply.
****************************************************************************/
static bool cli_issue_write(struct cli_state *cli,
int fnum,
off_t offset,
uint16 mode,
const char *buf,
size_t size,
int i)
{
char *p;
bool large_writex = false;
/* We can only do direct writes if not signing and not encrypting. */
bool direct_writes = !client_is_signing_on(cli) && !cli_encryption_on(cli);
if (!direct_writes && size + 1 > cli->bufsize) {
cli->outbuf = (char *)SMB_REALLOC(cli->outbuf, size + 1024);
if (!cli->outbuf) {
return False;
}
cli->inbuf = (char *)SMB_REALLOC(cli->inbuf, size + 1024);
if (cli->inbuf == NULL) {
SAFE_FREE(cli->outbuf);
return False;
}
cli->bufsize = size + 1024;
}
memset(cli->outbuf,'\0',smb_size);
memset(cli->inbuf,'\0',smb_size);
if (cli->capabilities & CAP_LARGE_FILES) {
large_writex = True;
}
if (large_writex) {
cli_set_message(cli->outbuf,14,0,True);
} else {
cli_set_message(cli->outbuf,12,0,True);
}
SCVAL(cli->outbuf,smb_com,SMBwriteX);
SSVAL(cli->outbuf,smb_tid,cli->cnum);
cli_setup_packet(cli);
SCVAL(cli->outbuf,smb_vwv0,0xFF);
SSVAL(cli->outbuf,smb_vwv2,fnum);
SIVAL(cli->outbuf,smb_vwv3,offset);
SIVAL(cli->outbuf,smb_vwv5,0);
SSVAL(cli->outbuf,smb_vwv7,mode);
SSVAL(cli->outbuf,smb_vwv8,(mode & 0x0008) ? size : 0);
/*
* According to CIFS-TR-1p00, this following field should only
* be set if CAP_LARGE_WRITEX is set. We should check this
* locally. However, this check might already have been
* done by our callers.
*/
SSVAL(cli->outbuf,smb_vwv9,(size>>16));
SSVAL(cli->outbuf,smb_vwv10,size);
/* +1 is pad byte. */
SSVAL(cli->outbuf,smb_vwv11,
smb_buf(cli->outbuf) - smb_base(cli->outbuf) + 1);
if (large_writex) {
SIVAL(cli->outbuf,smb_vwv12,(((SMB_BIG_UINT)offset)>>32) & 0xffffffff);
}
p = smb_base(cli->outbuf) + SVAL(cli->outbuf,smb_vwv11) -1;
*p++ = '\0'; /* pad byte. */
if (!direct_writes) {
memcpy(p, buf, size);
}
if (size > 0x1FFFF) {
/* This is a POSIX 14 word large write. */
set_message_bcc(cli->outbuf, 0); /* Set bcc to zero. */
_smb_setlen_large(cli->outbuf,smb_size + 28 + 1 /* pad */ + size - 4);
} else {
cli_setup_bcc(cli, p+size);
}
SSVAL(cli->outbuf,smb_mid,cli->mid + i);
show_msg(cli->outbuf);
if (direct_writes) {
/* For direct writes we now need to write the data
* directly out of buf. */
return cli_send_smb_direct_writeX(cli, buf, size);
} else {
return cli_send_smb(cli);
}
}
/****************************************************************************
write to a file
write_mode: 0x0001 disallow write cacheing
0x0002 return bytes remaining
0x0004 use raw named pipe protocol
0x0008 start of message mode named pipe protocol
****************************************************************************/
ssize_t cli_write(struct cli_state *cli,
int fnum, uint16 write_mode,
const char *buf, off_t offset, size_t size)
{
ssize_t bwritten = 0;
unsigned int issued = 0;
unsigned int received = 0;
int mpx = 1;
size_t writesize;
int blocks;
if(cli->max_mux > 1) {
mpx = cli->max_mux-1;
} else {
mpx = 1;
}
/* Default (small) writesize. */
writesize = (cli->max_xmit - (smb_size+32)) & ~1023;
if (write_mode == 0 &&
!client_is_signing_on(cli) &&
!cli_encryption_on(cli) &&
(cli->posix_capabilities & CIFS_UNIX_LARGE_WRITE_CAP) &&
(cli->capabilities & CAP_LARGE_FILES)) {
/* Only do massive writes if we can do them direct
* with no signing or encrypting - not on a pipe. */
writesize = CLI_SAMBA_MAX_POSIX_LARGE_WRITEX_SIZE;
} else if (cli->capabilities & CAP_LARGE_WRITEX) {
if (cli->is_samba) {
writesize = CLI_SAMBA_MAX_LARGE_WRITEX_SIZE;
} else if (!client_is_signing_on(cli)) {
/* Windows restricts signed writes to max_xmit.
* Found by Volker. */
writesize = CLI_WINDOWS_MAX_LARGE_WRITEX_SIZE;
}
}
blocks = (size + (writesize-1)) / writesize;
while (received < blocks) {
while ((issued - received < mpx) && (issued < blocks)) {
ssize_t bsent = issued * writesize;
ssize_t size1 = MIN(writesize, size - bsent);
if (!cli_issue_write(cli, fnum, offset + bsent,
write_mode,
buf + bsent,
size1, issued))
return -1;
issued++;
}
if (!cli_receive_smb(cli)) {
return bwritten;
}
received++;
if (cli_is_error(cli))
break;
bwritten += SVAL(cli->inbuf, smb_vwv2);
bwritten += (((int)(SVAL(cli->inbuf, smb_vwv4)))<<16);
}
while (received < issued && cli_receive_smb(cli)) {
received++;
}
return bwritten;
}
/****************************************************************************
write to a file using a SMBwrite and not bypassing 0 byte writes
****************************************************************************/
ssize_t cli_smbwrite(struct cli_state *cli,
int fnum, char *buf, off_t offset, size_t size1)
{
char *p;
ssize_t total = 0;
do {
size_t size = MIN(size1, cli->max_xmit - 48);
memset(cli->outbuf,'\0',smb_size);
memset(cli->inbuf,'\0',smb_size);
cli_set_message(cli->outbuf,5, 0,True);
SCVAL(cli->outbuf,smb_com,SMBwrite);
SSVAL(cli->outbuf,smb_tid,cli->cnum);
cli_setup_packet(cli);
SSVAL(cli->outbuf,smb_vwv0,fnum);
SSVAL(cli->outbuf,smb_vwv1,size);
SIVAL(cli->outbuf,smb_vwv2,offset);
SSVAL(cli->outbuf,smb_vwv4,0);
p = smb_buf(cli->outbuf);
*p++ = 1;
SSVAL(p, 0, size); p += 2;
memcpy(p, buf + total, size); p += size;
cli_setup_bcc(cli, p);
if (!cli_send_smb(cli))
return -1;
if (!cli_receive_smb(cli))
return -1;
if (cli_is_error(cli))
return -1;
size = SVAL(cli->inbuf,smb_vwv0);
if (size == 0)
break;
size1 -= size;
total += size;
offset += size;
} while (size1);
return total;
}
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