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 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 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 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