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 * Copyright 2017 Nexenta Systems, Inc. All rights reserved. 26 */ 27 28 #include <smbsrv/smb_kproto.h> 29 30 /* 31 * The echo request is used to test the connection to the server, 32 * and to see if the server is still responding. The tid is ignored, 33 * so this request may be sent to the server even if there are no 34 * tree connections to the server. 35 * 36 * Each response echoes the data sent, though ByteCount may indicate 37 * no data. If echo-count is zero, no response is sent. 38 */ 39 smb_sdrc_t 40 smb_pre_echo(smb_request_t *sr) 41 { 42 DTRACE_SMB_START(op__Echo, smb_request_t *, sr); 43 return (SDRC_SUCCESS); 44 } 45 46 void 47 smb_post_echo(smb_request_t *sr) 48 { 49 DTRACE_SMB_DONE(op__Echo, smb_request_t *, sr); 50 } 51 52 static unsigned short smb_max_echo = 10; 53 54 smb_sdrc_t 55 smb_com_echo(struct smb_request *sr) 56 { 57 unsigned short necho; 58 unsigned short nbytes; 59 unsigned short i; 60 struct mbuf_chain reply; 61 char *data; 62 uint16_t pid_hi, pid_lo; 63 64 pid_hi = sr->smb_pid >> 16; 65 pid_lo = (uint16_t)sr->smb_pid; 66 67 if (smbsr_decode_vwv(sr, "w", &necho) != 0) 68 return (SDRC_ERROR); 69 70 /* 71 * Don't let the client fool us into doing 72 * more work than is "reasonable". 73 */ 74 if (necho > smb_max_echo) 75 necho = smb_max_echo; 76 77 nbytes = sr->smb_bcc; 78 data = smb_srm_zalloc(sr, nbytes); 79 80 if (smb_mbc_decodef(&sr->smb_data, "#c", nbytes, data)) 81 return (SDRC_ERROR); 82 83 for (i = 1; i <= necho; ++i) { 84 85 /* 86 * According to [MS-CIFS] 3.3.5.32 echo is 87 * subject to cancellation. 88 */ 89 if (sr->sr_state != SMB_REQ_STATE_ACTIVE) 90 break; 91 92 MBC_INIT(&reply, SMB_HEADER_ED_LEN + 10 + nbytes); 93 94 (void) smb_mbc_encodef(&reply, SMB_HEADER_ED_FMT, 95 sr->first_smb_com, 96 sr->smb_rcls, 97 sr->smb_reh, 98 sr->smb_err, 99 sr->smb_flg | SMB_FLAGS_REPLY, 100 sr->smb_flg2, 101 pid_hi, 102 sr->smb_sig, 103 sr->smb_tid, 104 pid_lo, 105 sr->smb_uid, 106 sr->smb_mid); 107 108 (void) smb_mbc_encodef(&reply, "bww#c", 1, i, 109 nbytes, nbytes, data); 110 111 if (sr->session->signing.flags & SMB_SIGNING_ENABLED) 112 smb_sign_reply(sr, &reply); 113 114 (void) smb_session_send(sr->session, 0, &reply); 115 116 delay(MSEC_TO_TICK(100)); 117 } 118 119 return (SDRC_NO_REPLY); 120 } 121