1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 #include <smbsrv/smb_kproto.h>
27
28 /*
29 * The echo request is used to test the connection to the server,
30 * and to see if the server is still responding. The tid is ignored,
31 * so this request may be sent to the server even if there are no
32 * tree connections to the server.
33 *
34 * Each response echoes the data sent, though ByteCount may indicate
35 * no data. If echo-count is zero, no response is sent.
36 */
37 smb_sdrc_t
smb_pre_echo(smb_request_t * sr)38 smb_pre_echo(smb_request_t *sr)
39 {
40 DTRACE_SMB_1(op__Echo__start, smb_request_t *, sr);
41 return (SDRC_SUCCESS);
42 }
43
44 void
smb_post_echo(smb_request_t * sr)45 smb_post_echo(smb_request_t *sr)
46 {
47 DTRACE_SMB_1(op__Echo__done, smb_request_t *, sr);
48 }
49
50 static unsigned short smb_max_echo = 10;
51
52 smb_sdrc_t
smb_com_echo(struct smb_request * sr)53 smb_com_echo(struct smb_request *sr)
54 {
55 unsigned short necho;
56 unsigned short nbytes;
57 unsigned short i;
58 struct mbuf_chain reply;
59 char *data;
60
61 if (smbsr_decode_vwv(sr, "w", &necho) != 0)
62 return (SDRC_ERROR);
63
64 /*
65 * Don't let the client fool us into doing
66 * more work than is "reasonable".
67 */
68 if (necho > smb_max_echo)
69 necho = smb_max_echo;
70
71 nbytes = sr->smb_bcc;
72 data = smb_srm_zalloc(sr, nbytes);
73
74 if (smb_mbc_decodef(&sr->smb_data, "#c", nbytes, data))
75 return (SDRC_ERROR);
76
77 for (i = 1; i <= necho; ++i) {
78
79 /*
80 * According to [MS-CIFS] 3.3.5.32 echo is
81 * subject to cancellation.
82 */
83 if (sr->sr_state != SMB_REQ_STATE_ACTIVE)
84 break;
85
86 MBC_INIT(&reply, SMB_HEADER_ED_LEN + 10 + nbytes);
87
88 (void) smb_mbc_encodef(&reply, SMB_HEADER_ED_FMT,
89 sr->first_smb_com,
90 sr->smb_rcls,
91 sr->smb_reh,
92 sr->smb_err,
93 sr->smb_flg | SMB_FLAGS_REPLY,
94 sr->smb_flg2,
95 sr->smb_pid_high,
96 sr->smb_sig,
97 sr->smb_tid,
98 sr->smb_pid,
99 sr->smb_uid,
100 sr->smb_mid);
101
102 (void) smb_mbc_encodef(&reply, "bww#c", 1, i,
103 nbytes, nbytes, data);
104
105 if (sr->session->signing.flags & SMB_SIGNING_ENABLED)
106 smb_sign_reply(sr, &reply);
107
108 (void) smb_session_send(sr->session, 0, &reply);
109
110 delay(MSEC_TO_TICK(100));
111 }
112
113 return (SDRC_NO_REPLY);
114 }
115