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/*
Unix SMB/CIFS implementation.
SMB client transport context management functions
Copyright (C) Andrew Tridgell 1994-2003
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"
/*
create a transport structure based on an established socket
*/
struct cli_transport *cli_transport_init(struct cli_socket *sock)
{
TALLOC_CTX *mem_ctx;
struct cli_transport *transport;
mem_ctx = talloc_init("cli_transport");
if (!mem_ctx) return NULL;
transport = talloc_zero(mem_ctx, sizeof(*transport));
if (!transport) return NULL;
transport->mem_ctx = mem_ctx;
transport->socket = sock;
transport->negotiate.protocol = PROTOCOL_NT1;
transport->negotiate.max_xmit = ~0;
cli_null_set_signing(transport);
transport->socket->reference_count++;
return transport;
}
/*
decrease reference count on a transport, and destroy if it becomes
zero
*/
void cli_transport_close(struct cli_transport *transport)
{
transport->reference_count--;
if (transport->reference_count <= 0) {
cli_sock_close(transport->socket);
talloc_destroy(transport->mem_ctx);
}
}
/****************************************************************************
send a session request (if appropriate)
****************************************************************************/
BOOL cli_transport_connect(struct cli_transport *transport,
struct nmb_name *calling,
struct nmb_name *called)
{
char *p;
int len = NBT_HDR_SIZE;
struct cli_request *req;
/* 445 doesn't have session request */
if (transport->socket->port == 445) {
return True;
}
/* allocate output buffer */
req = cli_request_setup_nonsmb(transport, NBT_HDR_SIZE + 2*nbt_mangled_name_len());
/* put in the destination name */
p = req->out.buffer + NBT_HDR_SIZE;
name_mangle(called->name, p, called->name_type);
len += name_len(p);
/* and my name */
p = req->out.buffer+len;
name_mangle(calling->name, p, calling->name_type);
len += name_len(p);
_smb_setlen(req->out.buffer,len-4);
SCVAL(req->out.buffer,0,0x81);
if (!cli_request_send(req) ||
!cli_request_receive(req)) {
cli_request_destroy(req);
return False;
}
if (CVAL(req->in.buffer,0) != 0x82) {
transport->error.etype = ETYPE_NBT;
transport->error.e.nbt_error = CVAL(req->in.buffer,4);
cli_request_destroy(req);
return False;
}
cli_request_destroy(req);
return True;
}
/****************************************************************************
get next mid in sequence
****************************************************************************/
uint16 cli_transport_next_mid(struct cli_transport *transport)
{
uint16 mid;
struct cli_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_requests; req; req=req->next) {
if (req->mid == mid) {
mid++;
goto again;
}
}
transport->next_mid = mid+1;
return mid;
}
/*
setup the idle handler for a transport
*/
void cli_transport_idle_handler(struct cli_transport *transport,
void (*idle_func)(struct cli_transport *, void *),
uint_t period,
void *private)
{
transport->idle.func = idle_func;
transport->idle.private = private;
transport->idle.period = period;
}
/*
determine if a packet is pending for receive on a transport
*/
BOOL cli_transport_pending(struct cli_transport *transport)
{
return socket_pending(transport->socket->fd);
}
/*
wait for data on a transport, periodically calling a wait function
if one has been defined
return True if a packet is received
*/
BOOL cli_transport_select(struct cli_transport *transport)
{
fd_set fds;
int selrtn;
int fd;
struct timeval timeout;
fd = transport->socket->fd;
if (fd == -1) {
return False;
}
do {
uint_t period = 1000;
FD_ZERO(&fds);
FD_SET(fd,&fds);
if (transport->idle.func) {
period = transport->idle.period;
}
timeout.tv_sec = period / 1000;
timeout.tv_usec = 1000*(period%1000);
selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
if (selrtn == 1) {
/* the fd is readable */
return True;
}
if (selrtn == -1) {
/* sys_select_intr() already handles EINTR, so this
is an error. The socket is probably dead */
return False;
}
/* only other possibility is that we timed out - call the idle function
if there is one */
if (transport->idle.func) {
transport->idle.func(transport, transport->idle.private);
}
} while (selrtn == 0);
return True;
}
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