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/*
Unix SMB/CIFS implementation.
SMB client transport context management functions
Copyright (C) Andrew Tridgell 1994-2005
Copyright (C) James Myers 2003 <myersjj@samba.org>
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#include "libcli/raw/libcliraw.h"
#include "system/time.h"
#include "dlinklist.h"
#include "events.h"
static void smbcli_transport_process_recv(struct smbcli_transport *transport);
static void smbcli_transport_process_send(struct smbcli_transport *transport);
/*
an event has happened on the socket
*/
static void smbcli_transport_event_handler(struct event_context *ev, struct fd_event *fde,
struct timeval t, uint16_t flags)
{
struct smbcli_transport *transport = fde->private;
if (flags & EVENT_FD_READ) {
smbcli_transport_process_recv(transport);
return;
}
if (flags & EVENT_FD_WRITE) {
smbcli_transport_process_send(transport);
}
}
/*
destroy a transport
*/
static int transport_destructor(void *ptr)
{
struct smbcli_transport *transport = ptr;
smbcli_transport_dead(transport);
event_remove_timed(transport->socket->event.ctx, transport->socket->event.te);
return 0;
}
/*
create a transport structure based on an established socket
*/
struct smbcli_transport *smbcli_transport_init(struct smbcli_socket *sock)
{
struct smbcli_transport *transport;
transport = talloc_p(sock, struct smbcli_transport);
if (!transport) return NULL;
ZERO_STRUCTP(transport);
transport->socket = talloc_reference(transport, sock);
transport->negotiate.protocol = PROTOCOL_NT1;
transport->options.use_spnego = lp_use_spnego();
transport->options.max_xmit = lp_max_xmit();
transport->options.max_mux = lp_maxmux();
transport->negotiate.max_xmit = transport->options.max_xmit;
smbcli_init_signing(transport);
ZERO_STRUCT(transport->called);
/* take over event handling from the socket layer - it only
handles events up until we are connected */
transport->socket->event.fde->handler = smbcli_transport_event_handler;
transport->socket->event.fde->private = transport;
transport->socket->event.fde->flags = EVENT_FD_READ;
talloc_set_destructor(transport, transport_destructor);
return transport;
}
/*
mark the transport as dead
*/
void smbcli_transport_dead(struct smbcli_transport *transport)
{
smbcli_sock_dead(transport->socket);
/* all pending sends become errors */
while (transport->pending_send) {
struct smbcli_request *req = transport->pending_send;
req->state = SMBCLI_REQUEST_ERROR;
req->status = NT_STATUS_NET_WRITE_FAULT;
DLIST_REMOVE(transport->pending_send, req);
if (req->async.fn) {
req->async.fn(req);
}
}
/* as do all pending receives */
while (transport->pending_recv) {
struct smbcli_request *req = transport->pending_recv;
req->state = SMBCLI_REQUEST_ERROR;
req->status = NT_STATUS_NET_WRITE_FAULT;
DLIST_REMOVE(transport->pending_recv, req);
if (req->async.fn) {
req->async.fn(req);
}
}
}
/*
enable select for write on a transport
*/
static void smbcli_transport_write_enable(struct smbcli_transport *transport)
{
transport->socket->event.fde->flags |= EVENT_FD_WRITE;
}
/*
disable select for write on a transport
*/
static void smbcli_transport_write_disable(struct smbcli_transport *transport)
{
transport->socket->event.fde->flags &= ~EVENT_FD_WRITE;
}
/*
send a session request
*/
struct smbcli_request *smbcli_transport_connect_send(struct smbcli_transport *transport,
struct nmb_name *calling,
struct nmb_name *called)
{
uint8_t *p;
int len = NBT_HDR_SIZE;
struct smbcli_request *req;
if (called) {
transport->called = *called;
}
/* allocate output buffer */
req = smbcli_request_setup_nonsmb(transport,
NBT_HDR_SIZE + 2*nbt_mangled_name_len());
if (req == NULL) return NULL;
/* put in the destination name */
p = req->out.buffer + NBT_HDR_SIZE;
name_mangle(called->name, (char *)p, called->name_type);
len += name_len((char *)p);
/* and my name */
p = req->out.buffer+len;
name_mangle(calling->name, (char *)p, calling->name_type);
len += name_len((char *)p);
_smb_setlen(req->out.buffer,len-4);
SCVAL(req->out.buffer,0,0x81);
if (!smbcli_request_send(req)) {
smbcli_request_destroy(req);
return NULL;
}
return req;
}
/*
map a session request error to a NTSTATUS
*/
static NTSTATUS map_session_refused_error(uint8_t error)
{
switch (error) {
case 0x80:
case 0x81:
return NT_STATUS_REMOTE_NOT_LISTENING;
case 0x82:
return NT_STATUS_RESOURCE_NAME_NOT_FOUND;
case 0x83:
return NT_STATUS_REMOTE_RESOURCES;
}
return NT_STATUS_UNEXPECTED_IO_ERROR;
}
/*
finish a smbcli_transport_connect()
*/
NTSTATUS smbcli_transport_connect_recv(struct smbcli_request *req)
{
NTSTATUS status;
if (!smbcli_request_receive(req)) {
smbcli_request_destroy(req);
return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
}
switch (CVAL(req->in.buffer,0)) {
case 0x82:
status = NT_STATUS_OK;
break;
case 0x83:
status = map_session_refused_error(CVAL(req->in.buffer,4));
break;
case 0x84:
DEBUG(1,("Warning: session retarget not supported\n"));
status = NT_STATUS_NOT_SUPPORTED;
break;
default:
status = NT_STATUS_UNEXPECTED_IO_ERROR;
break;
}
smbcli_request_destroy(req);
return status;
}
/*
send a session request (if needed)
*/
BOOL smbcli_transport_connect(struct smbcli_transport *transport,
struct nmb_name *calling,
struct nmb_name *called)
{
struct smbcli_request *req;
NTSTATUS status;
if (transport->socket->port == 445) {
return True;
}
req = smbcli_transport_connect_send(transport,
calling, called);
status = smbcli_transport_connect_recv(req);
return NT_STATUS_IS_OK(status);
}
/****************************************************************************
get next mid in sequence
****************************************************************************/
uint16_t smbcli_transport_next_mid(struct smbcli_transport *transport)
{
uint16_t mid;
struct smbcli_request *req;
mid = transport->next_mid;
again:
/* now check to see if this mid is being used by one of the
pending requests. This is quite efficient because the list is
usually very short */
/* the zero mid is reserved for requests that don't have a mid */
if (mid == 0) mid = 1;
for (req=transport->pending_recv; req; req=req->next) {
if (req->mid == mid) {
mid++;
goto again;
}
}
transport->next_mid = mid+1;
return mid;
}
static void idle_handler(struct event_context *ev,
struct timed_event *te, struct timeval t)
{
struct smbcli_transport *transport = te->private;
te->next_event = timeval_add(&te->next_event, 0, transport->idle.period);
transport->idle.func(transport, transport->idle.private);
}
/*
setup the idle handler for a transport
the period is in microseconds
*/
void smbcli_transport_idle_handler(struct smbcli_transport *transport,
void (*idle_func)(struct smbcli_transport *, void *),
uint64_t period,
void *private)
{
struct timed_event te;
transport->idle.func = idle_func;
transport->idle.private = private;
transport->idle.period = period;
if (transport->socket->event.te != NULL) {
event_remove_timed(transport->socket->event.ctx, transport->socket->event.te);
}
te.next_event = timeval_current_ofs(0, period);
te.handler = idle_handler;
te.private = transport;
transport->socket->event.te = event_add_timed(transport->socket->event.ctx, &te);
}
/*
process some pending sends
*/
static void smbcli_transport_process_send(struct smbcli_transport *transport)
{
while (transport->pending_send) {
struct smbcli_request *req = transport->pending_send;
ssize_t ret;
ret = smbcli_sock_write(transport->socket, req->out.buffer, req->out.size);
if (ret == -1) {
if (errno == EAGAIN || errno == EINTR) {
return;
}
smbcli_transport_dead(transport);
return;
}
req->out.buffer += ret;
req->out.size -= ret;
if (req->out.size == 0) {
DLIST_REMOVE(transport->pending_send, req);
if (req->one_way_request) {
req->state = SMBCLI_REQUEST_DONE;
smbcli_request_destroy(req);
} else {
req->state = SMBCLI_REQUEST_RECV;
DLIST_ADD(transport->pending_recv, req);
}
}
}
/* we're out of requests to send, so don't wait for write
events any more */
smbcli_transport_write_disable(transport);
}
/*
we have a full request in our receive buffer - match it to a pending request
and process
*/
static void smbcli_transport_finish_recv(struct smbcli_transport *transport)
{
uint8_t *buffer, *hdr, *vwv;
int len;
uint16_t wct=0, mid = 0;
struct smbcli_request *req;
buffer = transport->recv_buffer.buffer;
len = transport->recv_buffer.req_size;
ZERO_STRUCT(transport->recv_buffer);
hdr = buffer+NBT_HDR_SIZE;
vwv = hdr + HDR_VWV;
/* see if it could be an oplock break request */
if (handle_oplock_break(transport, len, hdr, vwv)) {
talloc_free(buffer);
return;
}
/* at this point we need to check for a readbraw reply, as
these can be any length */
if (transport->readbraw_pending) {
transport->readbraw_pending = 0;
/* it must match the first entry in the pending queue
as the client is not allowed to have outstanding
readbraw requests */
req = transport->pending_recv;
if (!req) goto error;
req->in.buffer = buffer;
talloc_steal(req, buffer);
req->in.size = len;
req->in.allocated = req->in.size;
goto async;
}
if (len >= MIN_SMB_SIZE) {
/* extract the mid for matching to pending requests */
mid = SVAL(hdr, HDR_MID);
wct = CVAL(hdr, HDR_WCT);
}
/* match the incoming request against the list of pending requests */
for (req=transport->pending_recv; req; req=req->next) {
if (req->mid == mid) break;
}
if (!req) {
DEBUG(1,("Discarding unmatched reply with mid %d op %d\n",
mid, CVAL(hdr, HDR_COM)));
goto error;
}
/* fill in the 'in' portion of the matching request */
req->in.buffer = buffer;
talloc_steal(req, buffer);
req->in.size = len;
req->in.allocated = req->in.size;
/* handle NBT session replies */
if (req->in.size >= 4 && req->in.buffer[0] != 0) {
req->status = NT_STATUS_OK;
goto async;
}
/* handle non-SMB replies */
if (req->in.size < NBT_HDR_SIZE + MIN_SMB_SIZE) {
req->state = SMBCLI_REQUEST_ERROR;
goto error;
}
if (req->in.size < NBT_HDR_SIZE + MIN_SMB_SIZE + VWV(wct)) {
DEBUG(2,("bad reply size for mid %d\n", mid));
req->status = NT_STATUS_UNSUCCESSFUL;
req->state = SMBCLI_REQUEST_ERROR;
goto error;
}
req->in.hdr = hdr;
req->in.vwv = vwv;
req->in.wct = wct;
if (req->in.size >= NBT_HDR_SIZE + MIN_SMB_SIZE + VWV(wct)) {
req->in.data = req->in.vwv + VWV(wct) + 2;
req->in.data_size = SVAL(req->in.vwv, VWV(wct));
if (req->in.size < NBT_HDR_SIZE + MIN_SMB_SIZE + VWV(wct) + req->in.data_size) {
DEBUG(3,("bad data size for mid %d\n", mid));
/* blergh - w2k3 gives a bogus data size values in some
openX replies */
req->in.data_size = req->in.size - (NBT_HDR_SIZE + MIN_SMB_SIZE + VWV(wct));
}
}
req->in.ptr = req->in.data;
req->flags2 = SVAL(req->in.hdr, HDR_FLG2);
if (!(req->flags2 & FLAGS2_32_BIT_ERROR_CODES)) {
transport->error.etype = ETYPE_DOS;
transport->error.e.dos.eclass = CVAL(req->in.hdr,HDR_RCLS);
transport->error.e.dos.ecode = SVAL(req->in.hdr,HDR_ERR);
req->status = dos_to_ntstatus(transport->error.e.dos.eclass,
transport->error.e.dos.ecode);
} else {
transport->error.etype = ETYPE_NT;
transport->error.e.nt_status = NT_STATUS(IVAL(req->in.hdr, HDR_RCLS));
req->status = transport->error.e.nt_status;
}
if (!smbcli_request_check_sign_mac(req)) {
transport->error.etype = ETYPE_SOCKET;
transport->error.e.socket_error = SOCKET_READ_BAD_SIG;
req->state = SMBCLI_REQUEST_ERROR;
req->status = NT_STATUS_ACCESS_DENIED;
goto error;
};
async:
/* if this request has an async handler then call that to
notify that the reply has been received. This might destroy
the request so it must happen last */
DLIST_REMOVE(transport->pending_recv, req);
req->state = SMBCLI_REQUEST_DONE;
if (req->async.fn) {
req->async.fn(req);
}
return;
error:
if (req) {
DLIST_REMOVE(transport->pending_recv, req);
req->state = SMBCLI_REQUEST_ERROR;
}
}
/*
process some pending receives
*/
static void smbcli_transport_process_recv(struct smbcli_transport *transport)
{
/* a incoming packet goes through 2 stages - first we read the
4 byte header, which tells us how much more is coming. Then
we read the rest */
if (transport->recv_buffer.received < NBT_HDR_SIZE) {
ssize_t ret;
ret = smbcli_sock_read(transport->socket,
transport->recv_buffer.header +
transport->recv_buffer.received,
NBT_HDR_SIZE - transport->recv_buffer.received);
if (ret == -1) {
smbcli_transport_dead(transport);
return;
}
transport->recv_buffer.received += ret;
if (transport->recv_buffer.received == NBT_HDR_SIZE) {
/* we've got a full header */
transport->recv_buffer.req_size = smb_len(transport->recv_buffer.header) + NBT_HDR_SIZE;
transport->recv_buffer.buffer = talloc_size(transport,
NBT_HDR_SIZE+transport->recv_buffer.req_size);
if (transport->recv_buffer.buffer == NULL) {
smbcli_transport_dead(transport);
return;
}
memcpy(transport->recv_buffer.buffer, transport->recv_buffer.header, NBT_HDR_SIZE);
}
}
if (transport->recv_buffer.received < transport->recv_buffer.req_size) {
ssize_t ret;
ret = smbcli_sock_read(transport->socket,
transport->recv_buffer.buffer +
transport->recv_buffer.received,
transport->recv_buffer.req_size -
transport->recv_buffer.received);
if (ret == -1) {
smbcli_transport_dead(transport);
return;
}
transport->recv_buffer.received += ret;
}
if (transport->recv_buffer.received != 0 &&
transport->recv_buffer.received == transport->recv_buffer.req_size) {
smbcli_transport_finish_recv(transport);
}
}
/*
process some read/write requests that are pending
return False if the socket is dead
*/
BOOL smbcli_transport_process(struct smbcli_transport *transport)
{
smbcli_transport_process_send(transport);
smbcli_transport_process_recv(transport);
if (transport->socket->sock == NULL) {
return False;
}
return True;
}
/*
put a request into the send queue
*/
void smbcli_transport_send(struct smbcli_request *req)
{
/* check if the transport is dead */
if (req->transport->socket->sock == NULL) {
req->state = SMBCLI_REQUEST_ERROR;
req->status = NT_STATUS_NET_WRITE_FAULT;
return;
}
/* put it on the outgoing socket queue */
req->state = SMBCLI_REQUEST_SEND;
DLIST_ADD_END(req->transport->pending_send, req, struct smbcli_request *);
/* make sure we look for write events */
smbcli_transport_write_enable(req->transport);
}
|