/*
Unix SMB/CIFS implementation.
Infrastructure for async SMB client requests
Copyright (C) Volker Lendecke 2008
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 .
*/
#include "includes.h"
/*
* Read an smb packet asynchronously, discard keepalives
*/
struct read_smb_state {
struct tevent_context *ev;
int fd;
uint8_t *buf;
};
static ssize_t read_smb_more(uint8_t *buf, size_t buflen, void *private_data);
static void read_smb_done(struct tevent_req *subreq);
static struct tevent_req *read_smb_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
int fd)
{
struct tevent_req *result, *subreq;
struct read_smb_state *state;
result = tevent_req_create(mem_ctx, &state, struct read_smb_state);
if (result == NULL) {
return NULL;
}
state->ev = ev;
state->fd = fd;
subreq = read_packet_send(state, ev, fd, 4, read_smb_more, NULL);
if (subreq == NULL) {
goto fail;
}
tevent_req_set_callback(subreq, read_smb_done, result);
return result;
fail:
TALLOC_FREE(result);
return NULL;
}
static ssize_t read_smb_more(uint8_t *buf, size_t buflen, void *private_data)
{
if (buflen > 4) {
return 0; /* We've been here, we're done */
}
return smb_len_large(buf);
}
static void read_smb_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct read_smb_state *state = tevent_req_data(
req, struct read_smb_state);
ssize_t len;
int err;
len = read_packet_recv(subreq, state, &state->buf, &err);
TALLOC_FREE(subreq);
if (len == -1) {
tevent_req_error(req, err);
return;
}
if (CVAL(state->buf, 0) == SMBkeepalive) {
subreq = read_packet_send(state, state->ev, state->fd, 4,
read_smb_more, NULL);
if (tevent_req_nomem(subreq, req)) {
return;
}
tevent_req_set_callback(subreq, read_smb_done, req);
return;
}
tevent_req_done(req);
}
static ssize_t read_smb_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
uint8_t **pbuf, int *perrno)
{
struct read_smb_state *state = tevent_req_data(
req, struct read_smb_state);
if (tevent_req_is_unix_error(req, perrno)) {
return -1;
}
*pbuf = talloc_move(mem_ctx, &state->buf);
return talloc_get_size(*pbuf);
}
/**
* Fetch an error out of a NBT packet
* @param[in] buf The SMB packet
* @retval The error, converted to NTSTATUS
*/
NTSTATUS cli_pull_error(char *buf)
{
uint32_t flags2 = SVAL(buf, smb_flg2);
if (flags2 & FLAGS2_32_BIT_ERROR_CODES) {
return NT_STATUS(IVAL(buf, smb_rcls));
}
/* if the client uses dos errors, but there is no error,
we should return no error here, otherwise it looks
like an unknown bad NT_STATUS. jmcd */
if (CVAL(buf, smb_rcls) == 0)
return NT_STATUS_OK;
return NT_STATUS_DOS(CVAL(buf, smb_rcls), SVAL(buf,smb_err));
}
/**
* Compatibility helper for the sync APIs: Fake NTSTATUS in cli->inbuf
* @param[in] cli The client connection that just received an error
* @param[in] status The error to set on "cli"
*/
void cli_set_error(struct cli_state *cli, NTSTATUS status)
{
uint32_t flags2 = SVAL(cli->inbuf, smb_flg2);
if (NT_STATUS_IS_DOS(status)) {
SSVAL(cli->inbuf, smb_flg2,
flags2 & ~FLAGS2_32_BIT_ERROR_CODES);
SCVAL(cli->inbuf, smb_rcls, NT_STATUS_DOS_CLASS(status));
SSVAL(cli->inbuf, smb_err, NT_STATUS_DOS_CODE(status));
return;
}
SSVAL(cli->inbuf, smb_flg2, flags2 | FLAGS2_32_BIT_ERROR_CODES);
SIVAL(cli->inbuf, smb_rcls, NT_STATUS_V(status));
return;
}
/**
* Figure out if there is an andx command behind the current one
* @param[in] buf The smb buffer to look at
* @param[in] ofs The offset to the wct field that is followed by the cmd
* @retval Is there a command following?
*/
static bool have_andx_command(const char *buf, uint16_t ofs)
{
uint8_t wct;
size_t buflen = talloc_get_size(buf);
if ((ofs == buflen-1) || (ofs == buflen)) {
return false;
}
wct = CVAL(buf, ofs);
if (wct < 2) {
/*
* Not enough space for the command and a following pointer
*/
return false;
}
return (CVAL(buf, ofs+1) != 0xff);
}
#define MAX_SMB_IOV 5
struct cli_smb_state {
struct tevent_context *ev;
struct cli_state *cli;
uint8_t header[smb_wct+1]; /* Space for the header including the wct */
/*
* For normal requests, cli_smb_req_send chooses a mid. Secondary
* trans requests need to use the mid of the primary request, so we
* need a place to store it. Assume it's set if != 0.
*/
uint16_t mid;
uint16_t *vwv;
uint8_t bytecount_buf[2];
struct iovec iov[MAX_SMB_IOV+3];
int iov_count;
uint8_t *inbuf;
uint32_t seqnum;
int chain_num;
struct tevent_req **chained_requests;
};
static uint16_t cli_alloc_mid(struct cli_state *cli)
{
int num_pending = talloc_array_length(cli->pending);
uint16_t result;
while (true) {
int i;
result = cli->mid++;
if ((result == 0) || (result == 0xffff)) {
continue;
}
for (i=0; ipending[i])) {
break;
}
}
if (i == num_pending) {
return result;
}
}
}
void cli_smb_req_unset_pending(struct tevent_req *req)
{
struct cli_smb_state *state = tevent_req_data(
req, struct cli_smb_state);
struct cli_state *cli = state->cli;
int num_pending = talloc_array_length(cli->pending);
int i;
if (num_pending == 1) {
/*
* The pending read_smb tevent_req is a child of
* cli->pending. So if nothing is pending anymore, we need to
* delete the socket read fde.
*/
TALLOC_FREE(cli->pending);
return;
}
for (i=0; ipending[i]) {
break;
}
}
if (i == num_pending) {
/*
* Something's seriously broken. Just returning here is the
* right thing nevertheless, the point of this routine is to
* remove ourselves from cli->pending.
*/
return;
}
/*
* Remove ourselves from the cli->pending array
*/
if (num_pending > 1) {
cli->pending[i] = cli->pending[num_pending-1];
}
/*
* No NULL check here, we're shrinking by sizeof(void *), and
* talloc_realloc just adjusts the size for this.
*/
cli->pending = talloc_realloc(NULL, cli->pending, struct tevent_req *,
num_pending - 1);
return;
}
static int cli_smb_req_destructor(struct tevent_req *req)
{
cli_smb_req_unset_pending(req);
return 0;
}
static void cli_smb_received(struct tevent_req *subreq);
bool cli_smb_req_set_pending(struct tevent_req *req)
{
struct cli_smb_state *state = tevent_req_data(
req, struct cli_smb_state);
struct cli_state *cli;
struct tevent_req **pending;
int num_pending;
struct tevent_req *subreq;
cli = state->cli;
num_pending = talloc_array_length(cli->pending);
pending = talloc_realloc(cli, cli->pending, struct tevent_req *,
num_pending+1);
if (pending == NULL) {
return false;
}
pending[num_pending] = req;
cli->pending = pending;
talloc_set_destructor(req, cli_smb_req_destructor);
if (num_pending > 0) {
return true;
}
/*
* We're the first ones, add the read_smb request that waits for the
* answer from the server
*/
subreq = read_smb_send(cli->pending, state->ev, cli->fd);
if (subreq == NULL) {
cli_smb_req_unset_pending(req);
return false;
}
tevent_req_set_callback(subreq, cli_smb_received, cli);
return true;
}
/*
* Fetch a smb request's mid. Only valid after the request has been sent by
* cli_smb_req_send().
*/
uint16_t cli_smb_req_mid(struct tevent_req *req)
{
struct cli_smb_state *state = tevent_req_data(
req, struct cli_smb_state);
return SVAL(state->header, smb_mid);
}
void cli_smb_req_set_mid(struct tevent_req *req, uint16_t mid)
{
struct cli_smb_state *state = tevent_req_data(
req, struct cli_smb_state);
state->mid = mid;
}
static size_t iov_len(const struct iovec *iov, int count)
{
size_t result = 0;
int i;
for (i=0; i MAX_SMB_IOV) {
/*
* Should not happen :-)
*/
return NULL;
}
result = tevent_req_create(mem_ctx, &state, struct cli_smb_state);
if (result == NULL) {
return NULL;
}
state->ev = ev;
state->cli = cli;
state->mid = 0; /* Set to auto-choose in cli_smb_req_send */
state->chain_num = 0;
state->chained_requests = NULL;
cli_setup_packet_buf(cli, (char *)state->header);
SCVAL(state->header, smb_com, smb_command);
SSVAL(state->header, smb_tid, cli->cnum);
SCVAL(state->header, smb_wct, wct);
state->vwv = vwv;
SSVAL(state->bytecount_buf, 0, iov_len(bytes_iov, iov_count));
state->iov[0].iov_base = (void *)state->header;
state->iov[0].iov_len = sizeof(state->header);
state->iov[1].iov_base = (void *)state->vwv;
state->iov[1].iov_len = wct * sizeof(uint16_t);
state->iov[2].iov_base = (void *)state->bytecount_buf;
state->iov[2].iov_len = sizeof(uint16_t);
if (iov_count != 0) {
memcpy(&state->iov[3], bytes_iov,
iov_count * sizeof(*bytes_iov));
}
state->iov_count = iov_count + 3;
return result;
}
static NTSTATUS cli_signv(struct cli_state *cli, struct iovec *iov, int count,
uint32_t *seqnum)
{
uint8_t *buf;
/*
* Obvious optimization: Make cli_calculate_sign_mac work with struct
* iovec directly. MD5Update would do that just fine.
*/
if ((count <= 0) || (iov[0].iov_len < smb_wct)) {
return NT_STATUS_INVALID_PARAMETER;
}
buf = iov_concat(talloc_tos(), iov, count);
if (buf == NULL) {
return NT_STATUS_NO_MEMORY;
}
cli_calculate_sign_mac(cli, (char *)buf, seqnum);
memcpy(iov[0].iov_base, buf, iov[0].iov_len);
TALLOC_FREE(buf);
return NT_STATUS_OK;
}
static void cli_smb_sent(struct tevent_req *subreq);
static NTSTATUS cli_smb_req_iov_send(struct tevent_req *req,
struct cli_smb_state *state,
struct iovec *iov, int iov_count)
{
struct tevent_req *subreq;
NTSTATUS status;
if (state->cli->fd == -1) {
return NT_STATUS_CONNECTION_INVALID;
}
if (iov[0].iov_len < smb_wct) {
return NT_STATUS_INVALID_PARAMETER;
}
if (state->mid != 0) {
SSVAL(iov[0].iov_base, smb_mid, state->mid);
} else {
SSVAL(iov[0].iov_base, smb_mid, cli_alloc_mid(state->cli));
}
smb_setlen((char *)iov[0].iov_base, iov_len(iov, iov_count) - 4);
status = cli_signv(state->cli, iov, iov_count, &state->seqnum);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
if (cli_encryption_on(state->cli)) {
char *buf, *enc_buf;
buf = (char *)iov_concat(talloc_tos(), iov, iov_count);
if (buf == NULL) {
return NT_STATUS_NO_MEMORY;
}
status = cli_encrypt_message(state->cli, (char *)buf,
&enc_buf);
TALLOC_FREE(buf);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Error in encrypting client message: %s\n",
nt_errstr(status)));
return status;
}
buf = (char *)talloc_memdup(state, enc_buf,
smb_len(enc_buf)+4);
SAFE_FREE(enc_buf);
if (buf == NULL) {
return NT_STATUS_NO_MEMORY;
}
iov[0].iov_base = (void *)buf;
iov[0].iov_len = talloc_get_size(buf);
subreq = writev_send(state, state->ev, state->cli->outgoing,
state->cli->fd, false, iov, 1);
} else {
subreq = writev_send(state, state->ev, state->cli->outgoing,
state->cli->fd, false, iov, iov_count);
}
if (subreq == NULL) {
return NT_STATUS_NO_MEMORY;
}
tevent_req_set_callback(subreq, cli_smb_sent, req);
return NT_STATUS_OK;
}
NTSTATUS cli_smb_req_send(struct tevent_req *req)
{
struct cli_smb_state *state = tevent_req_data(
req, struct cli_smb_state);
return cli_smb_req_iov_send(req, state, state->iov, state->iov_count);
}
struct tevent_req *cli_smb_send(TALLOC_CTX *mem_ctx,
struct event_context *ev,
struct cli_state *cli,
uint8_t smb_command,
uint8_t additional_flags,
uint8_t wct, uint16_t *vwv,
uint32_t num_bytes,
const uint8_t *bytes)
{
struct tevent_req *req;
struct iovec iov;
NTSTATUS status;
iov.iov_base = CONST_DISCARD(void *, bytes);
iov.iov_len = num_bytes;
req = cli_smb_req_create(mem_ctx, ev, cli, smb_command,
additional_flags, wct, vwv, 1, &iov);
if (req == NULL) {
return NULL;
}
status = cli_smb_req_send(req);
if (!NT_STATUS_IS_OK(status)) {
tevent_req_nterror(req, status);
return tevent_req_post(req, ev);
}
return req;
}
static void cli_smb_sent(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct cli_smb_state *state = tevent_req_data(
req, struct cli_smb_state);
ssize_t nwritten;
int err;
nwritten = writev_recv(subreq, &err);
TALLOC_FREE(subreq);
if (nwritten == -1) {
if (state->cli->fd != -1) {
close(state->cli->fd);
state->cli->fd = -1;
}
tevent_req_nterror(req, map_nt_error_from_unix(err));
return;
}
switch (CVAL(state->header, smb_com)) {
case SMBtranss:
case SMBtranss2:
case SMBnttranss:
case SMBntcancel:
state->inbuf = NULL;
tevent_req_done(req);
return;
case SMBlockingX:
if ((CVAL(state->header, smb_wct) == 8) &&
(CVAL(state->vwv+3, 0) == LOCKING_ANDX_OPLOCK_RELEASE)) {
state->inbuf = NULL;
tevent_req_done(req);
return;
}
}
if (!cli_smb_req_set_pending(req)) {
tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
return;
}
}
static void cli_smb_received(struct tevent_req *subreq)
{
struct cli_state *cli = tevent_req_callback_data(
subreq, struct cli_state);
struct tevent_req *req;
struct cli_smb_state *state;
struct tevent_context *ev;
NTSTATUS status;
uint8_t *inbuf;
ssize_t received;
int num_pending;
int i, err;
uint16_t mid;
bool oplock_break;
received = read_smb_recv(subreq, talloc_tos(), &inbuf, &err);
TALLOC_FREE(subreq);
if (received == -1) {
if (cli->fd != -1) {
close(cli->fd);
cli->fd = -1;
}
status = map_nt_error_from_unix(err);
goto fail;
}
if ((IVAL(inbuf, 4) != 0x424d53ff) /* 0xFF"SMB" */
&& (SVAL(inbuf, 4) != 0x45ff)) /* 0xFF"E" */ {
DEBUG(10, ("Got non-SMB PDU\n"));
status = NT_STATUS_INVALID_NETWORK_RESPONSE;
goto fail;
}
if (cli_encryption_on(cli) && (CVAL(inbuf, 0) == 0)) {
uint16_t enc_ctx_num;
status = get_enc_ctx_num(inbuf, &enc_ctx_num);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(10, ("get_enc_ctx_num returned %s\n",
nt_errstr(status)));
goto fail;
}
if (enc_ctx_num != cli->trans_enc_state->enc_ctx_num) {
DEBUG(10, ("wrong enc_ctx %d, expected %d\n",
enc_ctx_num,
cli->trans_enc_state->enc_ctx_num));
status = NT_STATUS_INVALID_HANDLE;
goto fail;
}
status = common_decrypt_buffer(cli->trans_enc_state,
(char *)inbuf);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(10, ("common_decrypt_buffer returned %s\n",
nt_errstr(status)));
goto fail;
}
}
mid = SVAL(inbuf, smb_mid);
num_pending = talloc_array_length(cli->pending);
for (i=0; ipending[i])) {
break;
}
}
if (i == num_pending) {
/* Dump unexpected reply */
TALLOC_FREE(inbuf);
goto done;
}
oplock_break = false;
if (mid == 0xffff) {
/*
* Paranoia checks that this is really an oplock break request.
*/
oplock_break = (smb_len(inbuf) == 51); /* hdr + 8 words */
oplock_break &= ((CVAL(inbuf, smb_flg) & FLAG_REPLY) == 0);
oplock_break &= (CVAL(inbuf, smb_com) == SMBlockingX);
oplock_break &= (SVAL(inbuf, smb_vwv6) == 0);
oplock_break &= (SVAL(inbuf, smb_vwv7) == 0);
if (!oplock_break) {
/* Dump unexpected reply */
TALLOC_FREE(inbuf);
goto done;
}
}
req = cli->pending[i];
state = tevent_req_data(req, struct cli_smb_state);
ev = state->ev;
if (!oplock_break /* oplock breaks are not signed */
&& !cli_check_sign_mac(cli, (char *)inbuf, state->seqnum+1)) {
DEBUG(10, ("cli_check_sign_mac failed\n"));
TALLOC_FREE(inbuf);
status = NT_STATUS_ACCESS_DENIED;
goto fail;
}
if (state->chained_requests == NULL) {
state->inbuf = talloc_move(state, &inbuf);
talloc_set_destructor(req, NULL);
cli_smb_req_destructor(req);
tevent_req_done(req);
} else {
struct tevent_req **chain = talloc_move(
talloc_tos(), &state->chained_requests);
int num_chained = talloc_array_length(chain);
for (i=0; iinbuf = inbuf;
state->chain_num = i;
tevent_req_done(chain[i]);
}
TALLOC_FREE(inbuf);
TALLOC_FREE(chain);
}
done:
if (talloc_array_length(cli->pending) > 0) {
/*
* Set up another read request for the other pending cli_smb
* requests
*/
state = tevent_req_data(cli->pending[0], struct cli_smb_state);
subreq = read_smb_send(cli->pending, state->ev, cli->fd);
if (subreq == NULL) {
status = NT_STATUS_NO_MEMORY;
goto fail;
}
tevent_req_set_callback(subreq, cli_smb_received, cli);
}
return;
fail:
/*
* Cancel all pending requests. We don't do a for-loop walking
* cli->pending because that array changes in
* cli_smb_req_destructor().
*/
while (talloc_array_length(cli->pending) > 0) {
req = cli->pending[0];
talloc_set_destructor(req, NULL);
cli_smb_req_destructor(req);
tevent_req_nterror(req, status);
}
}
NTSTATUS cli_smb_recv(struct tevent_req *req, uint8_t min_wct,
uint8_t *pwct, uint16_t **pvwv,
uint32_t *pnum_bytes, uint8_t **pbytes)
{
struct cli_smb_state *state = tevent_req_data(
req, struct cli_smb_state);
NTSTATUS status = NT_STATUS_OK;
uint8_t cmd, wct;
uint16_t num_bytes;
size_t wct_ofs, bytes_offset;
int i;
if (tevent_req_is_nterror(req, &status)) {
return status;
}
if (state->inbuf == NULL) {
/* This was a request without a reply */
return NT_STATUS_OK;
}
wct_ofs = smb_wct;
cmd = CVAL(state->inbuf, smb_com);
for (i=0; ichain_num; i++) {
if (i < state->chain_num-1) {
if (cmd == 0xff) {
return NT_STATUS_REQUEST_ABORTED;
}
if (!is_andx_req(cmd)) {
return NT_STATUS_INVALID_NETWORK_RESPONSE;
}
}
if (!have_andx_command((char *)state->inbuf, wct_ofs)) {
/*
* This request was not completed because a previous
* request in the chain had received an error.
*/
return NT_STATUS_REQUEST_ABORTED;
}
wct_ofs = SVAL(state->inbuf, wct_ofs + 3);
/*
* Skip the all-present length field. No overflow, we've just
* put a 16-bit value into a size_t.
*/
wct_ofs += 4;
if (wct_ofs+2 > talloc_get_size(state->inbuf)) {
return NT_STATUS_INVALID_NETWORK_RESPONSE;
}
cmd = CVAL(state->inbuf, wct_ofs + 1);
}
status = cli_pull_error((char *)state->inbuf);
if (!have_andx_command((char *)state->inbuf, wct_ofs)
&& NT_STATUS_IS_ERR(status)) {
/*
* The last command takes the error code. All further commands
* down the requested chain will get a
* NT_STATUS_REQUEST_ABORTED.
*/
return status;
}
wct = CVAL(state->inbuf, wct_ofs);
bytes_offset = wct_ofs + 1 + wct * sizeof(uint16_t);
num_bytes = SVAL(state->inbuf, bytes_offset);
if (wct < min_wct) {
return NT_STATUS_INVALID_NETWORK_RESPONSE;
}
/*
* wct_ofs is a 16-bit value plus 4, wct is a 8-bit value, num_bytes
* is a 16-bit value. So bytes_offset being size_t should be far from
* wrapping.
*/
if ((bytes_offset + 2 > talloc_get_size(state->inbuf))
|| (bytes_offset > 0xffff)) {
return NT_STATUS_INVALID_NETWORK_RESPONSE;
}
if (pwct != NULL) {
*pwct = wct;
}
if (pvwv != NULL) {
*pvwv = (uint16_t *)(state->inbuf + wct_ofs + 1);
}
if (pnum_bytes != NULL) {
*pnum_bytes = num_bytes;
}
if (pbytes != NULL) {
*pbytes = (uint8_t *)state->inbuf + bytes_offset + 2;
}
return NT_STATUS_OK;
}
size_t cli_smb_wct_ofs(struct tevent_req **reqs, int num_reqs)
{
size_t wct_ofs;
int i;
wct_ofs = smb_wct - 4;
for (i=0; iiov+1, state->iov_count-1);
wct_ofs = (wct_ofs + 3) & ~3;
}
return wct_ofs;
}
NTSTATUS cli_smb_chain_send(struct tevent_req **reqs, int num_reqs)
{
struct cli_smb_state *first_state = tevent_req_data(
reqs[0], struct cli_smb_state);
struct cli_smb_state *last_state = tevent_req_data(
reqs[num_reqs-1], struct cli_smb_state);
struct cli_smb_state *state;
size_t wct_offset;
size_t chain_padding = 0;
int i, iovlen;
struct iovec *iov = NULL;
struct iovec *this_iov;
NTSTATUS status;
iovlen = 0;
for (i=0; iiov_count;
}
iov = talloc_array(last_state, struct iovec, iovlen);
if (iov == NULL) {
return NT_STATUS_NO_MEMORY;
}
first_state->chained_requests = (struct tevent_req **)talloc_memdup(
last_state, reqs, sizeof(*reqs) * num_reqs);
if (first_state->chained_requests == NULL) {
TALLOC_FREE(iov);
return NT_STATUS_NO_MEMORY;
}
wct_offset = smb_wct - 4;
this_iov = iov;
for (i=0; iheader, smb_com))
|| CVAL(state->header, smb_wct) < 2) {
TALLOC_FREE(iov);
TALLOC_FREE(first_state->chained_requests);
return NT_STATUS_INVALID_PARAMETER;
}
}
wct_offset += iov_len(state->iov+1, state->iov_count-1) + 1;
if ((wct_offset % 4) != 0) {
next_padding = 4 - (wct_offset % 4);
}
wct_offset += next_padding;
vwv = state->vwv;
if (i < num_reqs-1) {
struct cli_smb_state *next_state = tevent_req_data(
reqs[i+1], struct cli_smb_state);
SCVAL(vwv+0, 0, CVAL(next_state->header, smb_com));
SCVAL(vwv+0, 1, 0);
SSVAL(vwv+1, 0, wct_offset);
} else if (is_andx_req(CVAL(state->header, smb_com))) {
/* properly end the chain */
SCVAL(vwv+0, 0, 0xff);
SCVAL(vwv+0, 1, 0xff);
SSVAL(vwv+1, 0, 0);
}
if (i == 0) {
this_iov[0] = state->iov[0];
} else {
/*
* This one is a bit subtle. We have to add
* chain_padding bytes between the requests, and we
* have to also include the wct field of the
* subsequent requests. We use the subsequent header
* for the padding, it contains the wct field in its
* last byte.
*/
this_iov[0].iov_len = chain_padding+1;
this_iov[0].iov_base = (void *)&state->header[
sizeof(state->header) - this_iov[0].iov_len];
memset(this_iov[0].iov_base, 0, this_iov[0].iov_len-1);
}
memcpy(this_iov+1, state->iov+1,
sizeof(struct iovec) * (state->iov_count-1));
this_iov += state->iov_count;
chain_padding = next_padding;
}
status = cli_smb_req_iov_send(reqs[0], last_state, iov, iovlen);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(iov);
TALLOC_FREE(first_state->chained_requests);
return status;
}
return NT_STATUS_OK;
}
uint8_t *cli_smb_inbuf(struct tevent_req *req)
{
struct cli_smb_state *state = tevent_req_data(
req, struct cli_smb_state);
return state->inbuf;
}
bool cli_has_async_calls(struct cli_state *cli)
{
return ((tevent_queue_length(cli->outgoing) != 0)
|| (talloc_array_length(cli->pending) != 0));
}
struct cli_smb_oplock_break_waiter_state {
uint16_t fnum;
uint8_t level;
};
static void cli_smb_oplock_break_waiter_done(struct tevent_req *subreq);
struct tevent_req *cli_smb_oplock_break_waiter_send(TALLOC_CTX *mem_ctx,
struct event_context *ev,
struct cli_state *cli)
{
struct tevent_req *req, *subreq;
struct cli_smb_oplock_break_waiter_state *state;
struct cli_smb_state *smb_state;
req = tevent_req_create(mem_ctx, &state,
struct cli_smb_oplock_break_waiter_state);
if (req == NULL) {
return NULL;
}
/*
* Create a fake SMB request that we will never send out. This is only
* used to be set into the pending queue with the right mid.
*/
subreq = cli_smb_req_create(mem_ctx, ev, cli, 0, 0, 0, NULL, 0, NULL);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
smb_state = tevent_req_data(subreq, struct cli_smb_state);
SSVAL(smb_state->header, smb_mid, 0xffff);
if (!cli_smb_req_set_pending(subreq)) {
tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, cli_smb_oplock_break_waiter_done, req);
return req;
}
static void cli_smb_oplock_break_waiter_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct cli_smb_oplock_break_waiter_state *state = tevent_req_data(
req, struct cli_smb_oplock_break_waiter_state);
uint8_t wct;
uint16_t *vwv;
uint32_t num_bytes;
uint8_t *bytes;
NTSTATUS status;
status = cli_smb_recv(subreq, 8, &wct, &vwv, &num_bytes, &bytes);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(subreq);
tevent_req_nterror(req, status);
return;
}
state->fnum = SVAL(vwv+2, 0);
state->level = CVAL(vwv+3, 1);
tevent_req_done(req);
}
NTSTATUS cli_smb_oplock_break_waiter_recv(struct tevent_req *req,
uint16_t *pfnum,
uint8_t *plevel)
{
struct cli_smb_oplock_break_waiter_state *state = tevent_req_data(
req, struct cli_smb_oplock_break_waiter_state);
NTSTATUS status;
if (tevent_req_is_nterror(req, &status)) {
return status;
}
*pfnum = state->fnum;
*plevel = state->level;
return NT_STATUS_OK;
}