/*
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"
static void cli_state_handler(struct event_context *event_ctx,
struct fd_event *event, uint16 flags, void *p);
/**
* 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;
}
/**
* Allocate a new mid
* @param[in] cli The client connection
* @retval The new, unused mid
*/
static uint16_t cli_new_mid(struct cli_state *cli)
{
uint16_t result;
struct cli_request *req;
while (true) {
result = cli->mid++;
if (result == 0) {
continue;
}
for (req = cli->outstanding_requests; req; req = req->next) {
if (result == req->mid) {
break;
}
}
if (req == NULL) {
return result;
}
}
}
/**
* Print an async req that happens to be a cli_request
* @param[in] mem_ctx The TALLOC_CTX to put the result on
* @param[in] req The request to print
* @retval The string representation of "req"
*/
static char *cli_request_print(TALLOC_CTX *mem_ctx, struct async_req *req)
{
char *result = async_req_print(mem_ctx, req);
struct cli_request *cli_req = cli_request_get(req);
if (result == NULL) {
return NULL;
}
return talloc_asprintf_append_buffer(
result, "mid=%d\n", cli_req->mid);
}
/**
* Destroy a cli_request
* @param[in] req The cli_request to kill
* @retval Can't fail
*/
static int cli_request_destructor(struct cli_request *req)
{
if (req->enc_state != NULL) {
common_free_enc_buffer(req->enc_state, req->outbuf);
}
DLIST_REMOVE(req->cli->outstanding_requests, req);
if (req->cli->outstanding_requests == NULL) {
TALLOC_FREE(req->cli->fd_event);
}
return 0;
}
#if 0
/**
* Is the SMB command able to hold an AND_X successor
* @param[in] cmd The SMB command in question
* @retval Can we add a chained request after "cmd"?
*/
static bool is_andx_req(uint8_t cmd)
{
switch (cmd) {
case SMBtconX:
case SMBlockingX:
case SMBopenX:
case SMBreadX:
case SMBwriteX:
case SMBsesssetupX:
case SMBulogoffX:
case SMBntcreateX:
return true;
break;
default:
break;
}
return false;
}
/**
* @brief Find the smb_cmd offset of the last command pushed
* @param[in] buf The buffer we're building up
* @retval Where can we put our next andx cmd?
*
* While chaining requests, the "next" request we're looking at needs to put
* its SMB_Command before the data the previous request already built up added
* to the chain. Find the offset to the place where we have to put our cmd.
*/
static bool find_andx_cmd_ofs(char *buf, size_t *pofs)
{
uint8_t cmd;
size_t ofs;
cmd = CVAL(buf, smb_com);
SMB_ASSERT(is_andx_req(cmd));
ofs = smb_vwv0;
while (CVAL(buf, ofs) != 0xff) {
if (!is_andx_req(CVAL(buf, ofs))) {
return false;
}
/*
* ofs is from start of smb header, so add the 4 length
* bytes. The next cmd is right after the wct field.
*/
ofs = SVAL(buf, ofs+2) + 4 + 1;
SMB_ASSERT(ofs+4 < talloc_get_size(buf));
}
*pofs = ofs;
return true;
}
/**
* @brief Destroy an async_req that is the visible part of a cli_request
* @param[in] req The request to kill
* @retval Return 0 to make talloc happy
*
* This destructor is a bit tricky: Because a cli_request can host more than
* one async_req for chained requests, we need to make sure that the
* "cli_request" that we were part of is correctly destroyed at the right
* time. This is done by NULLing out ourself from the "async" member of our
* "cli_request". If there is none left, then also TALLOC_FREE() the
* cli_request, which was a talloc child of the client connection cli_state.
*/
static int cli_async_req_destructor(struct async_req *req)
{
struct cli_request *cli_req = cli_request_get(req);
int i, pending;
bool found = false;
pending = 0;
for (i=0; inum_async; i++) {
if (cli_req->async[i] == req) {
cli_req->async[i] = NULL;
found = true;
}
if (cli_req->async[i] != NULL) {
pending += 1;
}
}
SMB_ASSERT(found);
if (pending == 0) {
TALLOC_FREE(cli_req);
}
return 0;
}
/**
* @brief Chain up a request
* @param[in] mem_ctx The TALLOC_CTX for the result
* @param[in] ev The event context that will call us back
* @param[in] cli The cli_state we queue the request up for
* @param[in] smb_command The command that we want to issue
* @param[in] additional_flags open_and_x wants to add oplock header flags
* @param[in] wct How many words?
* @param[in] vwv The words, already in network order
* @param[in] num_bytes How many bytes?
* @param[in] bytes The data the request ships
*
* cli_request_chain() is the core of the SMB request marshalling routine. It
* will create a new async_req structure in the cli->chain_accumulator->async
* array and marshall the smb_cmd, the vwv array and the bytes into
* cli->chain_accumulator->outbuf.
*/
static struct async_req *cli_request_chain(TALLOC_CTX *mem_ctx,
struct event_context *ev,
struct cli_state *cli,
uint8_t smb_command,
uint8_t additional_flags,
uint8_t wct, const uint16_t *vwv,
uint16_t num_bytes,
const uint8_t *bytes)
{
struct async_req **tmp_reqs;
char *tmp_buf;
struct cli_request *req;
size_t old_size, new_size;
size_t ofs;
req = cli->chain_accumulator;
tmp_reqs = TALLOC_REALLOC_ARRAY(req, req->async, struct async_req *,
req->num_async + 1);
if (tmp_reqs == NULL) {
DEBUG(0, ("talloc failed\n"));
return NULL;
}
req->async = tmp_reqs;
req->num_async += 1;
req->async[req->num_async-1] = async_req_new(mem_ctx, ev);
if (req->async[req->num_async-1] == NULL) {
DEBUG(0, ("async_req_new failed\n"));
req->num_async -= 1;
return NULL;
}
req->async[req->num_async-1]->private_data = req;
req->async[req->num_async-1]->print = cli_request_print;
talloc_set_destructor(req->async[req->num_async-1],
cli_async_req_destructor);
old_size = talloc_get_size(req->outbuf);
/*
* We need space for the wct field, the words, the byte count field
* and the bytes themselves.
*/
new_size = old_size + 1 + wct * sizeof(uint16_t) + 2 + num_bytes;
if (new_size > 0xffff) {
DEBUG(1, ("cli_request_chain: %u bytes won't fit\n",
(unsigned)new_size));
goto fail;
}
tmp_buf = TALLOC_REALLOC_ARRAY(NULL, req->outbuf, char, new_size);
if (tmp_buf == NULL) {
DEBUG(0, ("talloc failed\n"));
goto fail;
}
req->outbuf = tmp_buf;
if (old_size == smb_wct) {
SCVAL(req->outbuf, smb_com, smb_command);
} else {
size_t andx_cmd_ofs;
if (!find_andx_cmd_ofs(req->outbuf, &andx_cmd_ofs)) {
DEBUG(1, ("invalid command chain\n"));
goto fail;
}
SCVAL(req->outbuf, andx_cmd_ofs, smb_command);
SSVAL(req->outbuf, andx_cmd_ofs + 2, old_size - 4);
}
ofs = old_size;
SCVAL(req->outbuf, ofs, wct);
ofs += 1;
memcpy(req->outbuf + ofs, vwv, sizeof(uint16_t) * wct);
ofs += sizeof(uint16_t) * wct;
SSVAL(req->outbuf, ofs, num_bytes);
ofs += sizeof(uint16_t);
memcpy(req->outbuf + ofs, bytes, num_bytes);
return req->async[req->num_async-1];
fail:
TALLOC_FREE(req->async[req->num_async-1]);
req->num_async -= 1;
return NULL;
}
/**
* @brief prepare a cli_state to accept a chain of requests
* @param[in] cli The cli_state we want to queue up in
* @param[in] ev The event_context that will call us back for the socket
* @param[in] size_hint How many bytes are expected, just an optimization
* @retval Did we have enough memory?
*
* cli_chain_cork() sets up a new cli_request in cli->chain_accumulator. If
* cli is used in an async fashion, i.e. if we have outstanding requests, then
* we do not have to create a fd event. If cli is used only with the sync
* helpers, we need to create the fd_event here.
*
* If you want to issue a chained request to the server, do a
* cli_chain_cork(), then do you cli_open_send(), cli_read_and_x_send(),
* cli_close_send() and so on. The async requests that come out of
* cli_xxx_send() are normal async requests with the difference that they
* won't be shipped individually. But the event_context will still trigger the
* req->async.fn to be called on every single request.
*
* You have to take care yourself that you only issue chainable requests in
* the middle of the chain.
*/
bool cli_chain_cork(struct cli_state *cli, struct event_context *ev,
size_t size_hint)
{
struct cli_request *req = NULL;
SMB_ASSERT(cli->chain_accumulator == NULL);
if (cli->fd_event == NULL) {
SMB_ASSERT(cli->outstanding_requests == NULL);
cli->fd_event = event_add_fd(ev, cli, cli->fd,
EVENT_FD_READ,
cli_state_handler, cli);
if (cli->fd_event == NULL) {
return false;
}
}
req = talloc(cli, struct cli_request);
if (req == NULL) {
goto fail;
}
req->cli = cli;
if (size_hint == 0) {
size_hint = 100;
}
req->outbuf = talloc_array(req, char, smb_wct + size_hint);
if (req->outbuf == NULL) {
goto fail;
}
req->outbuf = TALLOC_REALLOC_ARRAY(NULL, req->outbuf, char, smb_wct);
req->num_async = 0;
req->async = NULL;
req->enc_state = NULL;
SSVAL(req->outbuf, smb_tid, cli->cnum);
cli_setup_packet_buf(cli, req->outbuf);
req->mid = cli_new_mid(cli);
SSVAL(req->outbuf, smb_mid, req->mid);
cli->chain_accumulator = req;
DEBUG(10, ("cli_chain_cork: mid=%d\n", req->mid));
return true;
fail:
TALLOC_FREE(req);
if (cli->outstanding_requests == NULL) {
TALLOC_FREE(cli->fd_event);
}
return false;
}
/**
* Ship a request queued up via cli_request_chain()
* @param[in] cl The connection
*/
void cli_chain_uncork(struct cli_state *cli)
{
struct cli_request *req = cli->chain_accumulator;
SMB_ASSERT(req != NULL);
DLIST_ADD_END(cli->outstanding_requests, req, struct cli_request *);
talloc_set_destructor(req, cli_request_destructor);
cli->chain_accumulator = NULL;
smb_setlen(req->outbuf, talloc_get_size(req->outbuf) - 4);
cli_calculate_sign_mac(cli, req->outbuf);
if (cli_encryption_on(cli)) {
NTSTATUS status;
char *enc_buf;
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;
}
req->outbuf = enc_buf;
req->enc_state = cli->trans_enc_state;
}
req->sent = 0;
event_fd_set_writeable(cli->fd_event);
}
/**
* @brief Send a request to the server
* @param[in] mem_ctx The TALLOC_CTX for the result
* @param[in] ev The event context that will call us back
* @param[in] cli The cli_state we queue the request up for
* @param[in] smb_command The command that we want to issue
* @param[in] additional_flags open_and_x wants to add oplock header flags
* @param[in] wct How many words?
* @param[in] vwv The words, already in network order
* @param[in] num_bytes How many bytes?
* @param[in] bytes The data the request ships
*
* This is the generic routine to be used by the cli_xxx_send routines.
*/
struct async_req *cli_request_send(TALLOC_CTX *mem_ctx,
struct event_context *ev,
struct cli_state *cli,
uint8_t smb_command,
uint8_t additional_flags,
uint8_t wct, const uint16_t *vwv,
uint16_t num_bytes, const uint8_t *bytes)
{
struct async_req *result;
bool uncork = false;
if (cli->chain_accumulator == NULL) {
if (!cli_chain_cork(cli, ev,
wct * sizeof(uint16_t) + num_bytes + 3)) {
DEBUG(1, ("cli_chain_cork failed\n"));
return NULL;
}
uncork = true;
}
result = cli_request_chain(mem_ctx, ev, cli, smb_command,
additional_flags, wct, vwv,
num_bytes, bytes);
if (result == NULL) {
DEBUG(1, ("cli_request_chain failed\n"));
}
if (uncork) {
cli_chain_uncork(cli);
}
return result;
}
/**
* 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);
}
/**
* @brief Pull reply data out of a request
* @param[in] req The request that we just received a reply for
* @param[out] pwct How many words did the server send?
* @param[out] pvwv The words themselves
* @param[out] pnum_bytes How many bytes did the server send?
* @param[out] pbytes The bytes themselves
* @retval Was the reply formally correct?
*/
NTSTATUS cli_pull_reply(struct async_req *req,
uint8_t *pwct, uint16_t **pvwv,
uint16_t *pnum_bytes, uint8_t **pbytes)
{
struct cli_request *cli_req = cli_request_get(req);
uint8_t wct, cmd;
uint16_t num_bytes;
size_t wct_ofs, bytes_offset;
int i, j;
NTSTATUS status;
for (i = 0; i < cli_req->num_async; i++) {
if (req == cli_req->async[i]) {
break;
}
}
if (i == cli_req->num_async) {
cli_set_error(cli_req->cli, NT_STATUS_INVALID_PARAMETER);
return NT_STATUS_INVALID_PARAMETER;
}
/**
* The status we pull here is only relevant for the last reply in the
* chain.
*/
status = cli_pull_error(cli_req->inbuf);
if (i == 0) {
if (NT_STATUS_IS_ERR(status)
&& !have_andx_command(cli_req->inbuf, smb_wct)) {
cli_set_error(cli_req->cli, status);
return status;
}
wct_ofs = smb_wct;
goto done;
}
cmd = CVAL(cli_req->inbuf, smb_com);
wct_ofs = smb_wct;
for (j = 0; j < i; j++) {
if (j < i-1) {
if (cmd == 0xff) {
return NT_STATUS_REQUEST_ABORTED;
}
if (!is_andx_req(cmd)) {
return NT_STATUS_INVALID_NETWORK_RESPONSE;
}
}
if (!have_andx_command(cli_req->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(cli_req->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(cli_req->inbuf)) {
return NT_STATUS_INVALID_NETWORK_RESPONSE;
}
cmd = CVAL(cli_req->inbuf, wct_ofs + 1);
}
if (!have_andx_command(cli_req->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;
}
done:
wct = CVAL(cli_req->inbuf, wct_ofs);
bytes_offset = wct_ofs + 1 + wct * sizeof(uint16_t);
num_bytes = SVAL(cli_req->inbuf, bytes_offset);
/*
* 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(cli_req->inbuf))
|| (bytes_offset > 0xffff)) {
return NT_STATUS_INVALID_NETWORK_RESPONSE;
}
*pwct = wct;
*pvwv = (uint16_t *)(cli_req->inbuf + wct_ofs + 1);
*pnum_bytes = num_bytes;
*pbytes = (uint8_t *)cli_req->inbuf + bytes_offset + 2;
return NT_STATUS_OK;
}
#endif
/*
* Create a fresh async smb request
*/
static struct async_req *cli_request_new(TALLOC_CTX *mem_ctx,
struct event_context *ev,
struct cli_state *cli,
uint8_t num_words, size_t num_bytes,
struct cli_request **preq)
{
struct async_req *result;
struct cli_request *cli_req;
size_t bufsize = smb_size + num_words * 2 + num_bytes;
result = async_req_new(mem_ctx, ev);
if (result == NULL) {
return NULL;
}
cli_req = (struct cli_request *)talloc_size(
result, sizeof(*cli_req) + bufsize);
if (cli_req == NULL) {
TALLOC_FREE(result);
return NULL;
}
talloc_set_name_const(cli_req, "struct cli_request");
result->private_data = cli_req;
result->print = cli_request_print;
cli_req->async = result;
cli_req->cli = cli;
cli_req->outbuf = ((char *)cli_req + sizeof(*cli_req));
cli_req->sent = 0;
cli_req->mid = cli_new_mid(cli);
cli_req->inbuf = NULL;
cli_req->enc_state = NULL;
SCVAL(cli_req->outbuf, smb_wct, num_words);
SSVAL(cli_req->outbuf, smb_vwv + num_words * 2, num_bytes);
DLIST_ADD_END(cli->outstanding_requests, cli_req,
struct cli_request *);
talloc_set_destructor(cli_req, cli_request_destructor);
DEBUG(10, ("cli_request_new: mid=%d\n", cli_req->mid));
*preq = cli_req;
return result;
}
/*
* Ship a new smb request to the server
*/
struct async_req *cli_request_send(TALLOC_CTX *mem_ctx,
struct event_context *ev,
struct cli_state *cli,
uint8_t smb_command,
uint8_t additional_flags,
uint8_t wct, const uint16_t *vwv,
uint16_t num_bytes, const uint8_t *bytes)
{
struct async_req *result;
struct cli_request *req;
if (cli->fd_event == NULL) {
SMB_ASSERT(cli->outstanding_requests == NULL);
cli->fd_event = event_add_fd(ev, cli, cli->fd,
EVENT_FD_READ,
cli_state_handler, cli);
if (cli->fd_event == NULL) {
return NULL;
}
}
result = cli_request_new(mem_ctx, ev, cli, wct, num_bytes, &req);
if (result == NULL) {
DEBUG(0, ("cli_request_new failed\n"));
TALLOC_FREE(cli->fd_event);
return NULL;
}
cli_set_message(req->outbuf, wct, num_bytes, false);
SCVAL(req->outbuf, smb_com, smb_command);
SSVAL(req->outbuf, smb_tid, cli->cnum);
cli_setup_packet_buf(cli, req->outbuf);
memcpy(req->outbuf + smb_vwv0, vwv, sizeof(uint16_t) * wct);
memcpy(smb_buf(req->outbuf), bytes, num_bytes);
SSVAL(req->outbuf, smb_mid, req->mid);
SCVAL(cli->outbuf, smb_flg,
CVAL(cli->outbuf,smb_flg) | additional_flags);
cli_calculate_sign_mac(cli, req->outbuf);
if (cli_encryption_on(cli)) {
NTSTATUS status;
char *enc_buf;
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;
}
event_fd_set_writeable(cli->fd_event);
return result;
}
/**
* @brief Pull reply data out of a request
* @param[in] req The request that we just received a reply for
* @param[out] pwct How many words did the server send?
* @param[out] pvwv The words themselves
* @param[out] pnum_bytes How many bytes did the server send?
* @param[out] pbytes The bytes themselves
* @retval Was the reply formally correct?
*/
NTSTATUS cli_pull_reply(struct async_req *req,
uint8_t *pwct, uint16_t **pvwv,
uint16_t *pnum_bytes, uint8_t **pbytes)
{
struct cli_request *cli_req = cli_request_get(req);
uint8_t wct, cmd;
uint16_t num_bytes;
size_t wct_ofs, bytes_offset;
NTSTATUS status;
status = cli_pull_error(cli_req->inbuf);
if (NT_STATUS_IS_ERR(status)) {
cli_set_error(cli_req->cli, status);
return status;
}
cmd = CVAL(cli_req->inbuf, smb_com);
wct_ofs = smb_wct;
wct = CVAL(cli_req->inbuf, wct_ofs);
bytes_offset = wct_ofs + 1 + wct * sizeof(uint16_t);
num_bytes = SVAL(cli_req->inbuf, bytes_offset);
/*
* 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(cli_req->inbuf))
|| (bytes_offset > 0xffff)) {
return NT_STATUS_INVALID_NETWORK_RESPONSE;
}
*pwct = wct;
*pvwv = (uint16_t *)(cli_req->inbuf + wct_ofs + 1);
*pnum_bytes = num_bytes;
*pbytes = (uint8_t *)cli_req->inbuf + bytes_offset + 2;
return NT_STATUS_OK;
}
/**
* Convenience function to get the SMB part out of an async_req
* @param[in] req The request to look at
* @retval The private_data as struct cli_request
*/
struct cli_request *cli_request_get(struct async_req *req)
{
if (req == NULL) {
return NULL;
}
return talloc_get_type_abort(req->private_data, struct cli_request);
}
/**
* A PDU has arrived on cli->evt_inbuf
* @param[in] cli The cli_state that received something
*/
static void handle_incoming_pdu(struct cli_state *cli)
{
struct cli_request *req;
uint16_t mid;
size_t raw_pdu_len, buf_len, pdu_len, rest_len;
char *pdu;
NTSTATUS status;
/*
* The encrypted PDU len might differ from the unencrypted one
*/
raw_pdu_len = smb_len(cli->evt_inbuf) + 4;
buf_len = talloc_get_size(cli->evt_inbuf);
rest_len = buf_len - raw_pdu_len;
if (buf_len == raw_pdu_len) {
/*
* Optimal case: Exactly one PDU was in the socket buffer
*/
pdu = cli->evt_inbuf;
cli->evt_inbuf = NULL;
}
else {
DEBUG(11, ("buf_len = %d, raw_pdu_len = %d, splitting "
"buffer\n", (int)buf_len, (int)raw_pdu_len));
if (raw_pdu_len < rest_len) {
/*
* The PDU is shorter, talloc_memdup that one.
*/
pdu = (char *)talloc_memdup(
cli, cli->evt_inbuf, raw_pdu_len);
memmove(cli->evt_inbuf, cli->evt_inbuf + raw_pdu_len,
buf_len - raw_pdu_len);
cli->evt_inbuf = TALLOC_REALLOC_ARRAY(
NULL, cli->evt_inbuf, char, rest_len);
if (pdu == NULL) {
status = NT_STATUS_NO_MEMORY;
goto invalidate_requests;
}
}
else {
/*
* The PDU is larger than the rest, talloc_memdup the
* rest
*/
pdu = cli->evt_inbuf;
cli->evt_inbuf = (char *)talloc_memdup(
cli, pdu + raw_pdu_len, rest_len);
if (cli->evt_inbuf == NULL) {
status = NT_STATUS_NO_MEMORY;
goto invalidate_requests;
}
}
}
/*
* TODO: Handle oplock break requests
*/
if (cli_encryption_on(cli) && CVAL(pdu, 0) == 0) {
uint16_t enc_ctx_num;
status = get_enc_ctx_num((uint8_t *)pdu, &enc_ctx_num);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(10, ("get_enc_ctx_num returned %s\n",
nt_errstr(status)));
goto invalidate_requests;
}
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 invalidate_requests;
}
status = common_decrypt_buffer(cli->trans_enc_state,
pdu);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(10, ("common_decrypt_buffer returned %s\n",
nt_errstr(status)));
goto invalidate_requests;
}
}
if (!cli_check_sign_mac(cli, pdu)) {
DEBUG(10, ("cli_check_sign_mac failed\n"));
status = NT_STATUS_ACCESS_DENIED;
goto invalidate_requests;
}
mid = SVAL(pdu, smb_mid);
DEBUG(10, ("handle_incoming_pdu: got mid %d\n", mid));
for (req = cli->outstanding_requests; req; req = req->next) {
if (req->mid == mid) {
break;
}
}
pdu_len = smb_len(pdu) + 4;
if (req == NULL) {
DEBUG(3, ("Request for mid %d not found, dumping PDU\n", mid));
TALLOC_FREE(pdu);
return;
}
req->inbuf = talloc_move(req, &pdu);
async_req_done(req->async);
return;
invalidate_requests:
DEBUG(10, ("handle_incoming_pdu: Aborting with %s\n",
nt_errstr(status)));
for (req = cli->outstanding_requests; req; req = req->next) {
async_req_error(req->async, status);
}
return;
}
/**
* fd event callback. This is the basic connection to the socket
* @param[in] event_ctx The event context that called us
* @param[in] event The event that fired
* @param[in] flags EVENT_FD_READ | EVENT_FD_WRITE
* @param[in] p private_data, in this case the cli_state
*/
static void cli_state_handler(struct event_context *event_ctx,
struct fd_event *event, uint16 flags, void *p)
{
struct cli_state *cli = (struct cli_state *)p;
struct cli_request *req;
DEBUG(11, ("cli_state_handler called with flags %d\n", flags));
if (flags & EVENT_FD_READ) {
int res, available;
size_t old_size, new_size;
char *tmp;
res = ioctl(cli->fd, FIONREAD, &available);
if (res == -1) {
DEBUG(10, ("ioctl(FIONREAD) failed: %s\n",
strerror(errno)));
goto sock_error;
}
if (available == 0) {
/* EOF */
goto sock_error;
}
old_size = talloc_get_size(cli->evt_inbuf);
new_size = old_size + available;
if (new_size < old_size) {
/* wrap */
goto sock_error;
}
tmp = TALLOC_REALLOC_ARRAY(cli, cli->evt_inbuf, char,
new_size);
if (tmp == NULL) {
/* nomem */
goto sock_error;
}
cli->evt_inbuf = tmp;
res = recv(cli->fd, cli->evt_inbuf + old_size, available, 0);
if (res == -1) {
DEBUG(10, ("recv failed: %s\n", strerror(errno)));
goto sock_error;
}
DEBUG(11, ("cli_state_handler: received %d bytes, "
"smb_len(evt_inbuf) = %d\n", (int)res,
smb_len(cli->evt_inbuf)));
/* recv *might* have returned less than announced */
new_size = old_size + res;
/* shrink, so I don't expect errors here */
cli->evt_inbuf = TALLOC_REALLOC_ARRAY(cli, cli->evt_inbuf,
char, new_size);
while ((cli->evt_inbuf != NULL)
&& ((smb_len(cli->evt_inbuf) + 4) <= new_size)) {
/*
* we've got a complete NBT level PDU in evt_inbuf
*/
handle_incoming_pdu(cli);
new_size = talloc_get_size(cli->evt_inbuf);
}
}
if (flags & EVENT_FD_WRITE) {
size_t to_send;
ssize_t sent;
for (req = cli->outstanding_requests; req; req = req->next) {
to_send = smb_len(req->outbuf)+4;
if (to_send > req->sent) {
break;
}
}
if (req == NULL) {
if (cli->fd_event != NULL) {
event_fd_set_not_writeable(cli->fd_event);
}
return;
}
sent = send(cli->fd, req->outbuf + req->sent,
to_send - req->sent, 0);
if (sent < 0) {
goto sock_error;
}
req->sent += sent;
if (req->sent == to_send) {
return;
}
}
return;
sock_error:
for (req = cli->outstanding_requests; req; req = req->next) {
req->async->state = ASYNC_REQ_ERROR;
req->async->status = map_nt_error_from_unix(errno);
}
TALLOC_FREE(cli->fd_event);
close(cli->fd);
cli->fd = -1;
}