2 Unix SMB/CIFS implementation.
3 SMB client transport context management functions
4 Copyright (C) Andrew Tridgell 1994-2003
5 Copyright (C) James Myers 2003 <myersjj@samba.org>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 create a transport structure based on an established socket
27 struct cli_transport *cli_transport_init(struct cli_socket *sock)
30 struct cli_transport *transport;
32 mem_ctx = talloc_init("cli_transport");
33 if (!mem_ctx) return NULL;
35 transport = talloc_zero(mem_ctx, sizeof(*transport));
36 if (!transport) return NULL;
38 transport->mem_ctx = mem_ctx;
39 transport->socket = sock;
40 transport->negotiate.protocol = PROTOCOL_NT1;
41 transport->negotiate.max_xmit = ~0;
42 cli_null_set_signing(transport);
43 transport->socket->reference_count++;
49 decrease reference count on a transport, and destroy if it becomes
52 void cli_transport_close(struct cli_transport *transport)
54 transport->reference_count--;
55 if (transport->reference_count <= 0) {
56 cli_sock_close(transport->socket);
57 talloc_destroy(transport->mem_ctx);
63 /****************************************************************************
64 send a session request (if appropriate)
65 ****************************************************************************/
66 BOOL cli_transport_connect(struct cli_transport *transport,
67 struct nmb_name *calling,
68 struct nmb_name *called)
71 int len = NBT_HDR_SIZE;
72 struct cli_request *req;
74 /* 445 doesn't have session request */
75 if (transport->socket->port == 445) {
79 /* allocate output buffer */
80 req = cli_request_setup_nonsmb(transport, NBT_HDR_SIZE + 2*nbt_mangled_name_len());
82 /* put in the destination name */
83 p = req->out.buffer + NBT_HDR_SIZE;
84 name_mangle(called->name, p, called->name_type);
88 p = req->out.buffer+len;
89 name_mangle(calling->name, p, calling->name_type);
92 _smb_setlen(req->out.buffer,len-4);
93 SCVAL(req->out.buffer,0,0x81);
95 if (!cli_request_send(req) ||
96 !cli_request_receive(req)) {
97 cli_request_destroy(req);
101 if (CVAL(req->in.buffer,0) != 0x82) {
102 transport->error.etype = ETYPE_NBT;
103 transport->error.e.nbt_error = CVAL(req->in.buffer,4);
104 cli_request_destroy(req);
108 cli_request_destroy(req);
113 /****************************************************************************
114 get next mid in sequence
115 ****************************************************************************/
116 uint16 cli_transport_next_mid(struct cli_transport *transport)
119 struct cli_request *req;
121 mid = transport->next_mid;
124 /* now check to see if this mid is being used by one of the
125 pending requests. This is quite efficient because the list is
126 usually very short */
128 /* the zero mid is reserved for requests that don't have a mid */
129 if (mid == 0) mid = 1;
131 for (req=transport->pending_requests; req; req=req->next) {
132 if (req->mid == mid) {
138 transport->next_mid = mid+1;
143 setup the idle handler for a transport
145 void cli_transport_idle_handler(struct cli_transport *transport,
146 void (*idle_func)(struct cli_transport *, void *),
150 transport->idle.func = idle_func;
151 transport->idle.private = private;
152 transport->idle.period = period;
157 determine if a packet is pending for receive on a transport
159 BOOL cli_transport_pending(struct cli_transport *transport)
161 return socket_pending(transport->socket->fd);
167 wait for data on a transport, periodically calling a wait function
168 if one has been defined
169 return True if a packet is received
171 BOOL cli_transport_select(struct cli_transport *transport)
176 struct timeval timeout;
178 fd = transport->socket->fd;
185 uint_t period = 1000;
190 if (transport->idle.func) {
191 period = transport->idle.period;
194 timeout.tv_sec = period / 1000;
195 timeout.tv_usec = 1000*(period%1000);
197 selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
200 /* the fd is readable */
205 /* sys_select_intr() already handles EINTR, so this
206 is an error. The socket is probably dead */
210 /* only other possibility is that we timed out - call the idle function
212 if (transport->idle.func) {
213 transport->idle.func(transport, transport->idle.private);
215 } while (selrtn == 0);