ISCSIHDDCore.cpp@ 17828

最後變更在這個檔案從17828是 17798,由 vboxsync 提交於 16 年前
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1	/** @file
2	* iSCSI initiator driver, VD backend.
3	*/
4
5	/*
6	* Copyright (C) 2006-2009 Sun Microsystems, Inc.
7	*
8	* This file is part of VirtualBox Open Source Edition (OSE), as
9	* available from http://www.alldomusa.eu.org. This file is free software;
10	* you can redistribute it and/or modify it under the terms of the GNU
11	* General Public License (GPL) as published by the Free Software
12	* Foundation, in version 2 as it comes in the "COPYING" file of the
13	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
14	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
15	*
16	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
17	* Clara, CA 95054 USA or visit http://www.sun.com if you need
18	* additional information or have any questions.
19	*/
20
21
22	/*******************************************************************************
23	* Header Files *
24	*******************************************************************************/
25	#define LOG_GROUP LOG_GROUP_VD_ISCSI
26	#include "VBoxHDD-Internal.h"
27	#define VBOX_VDICORE_VD /* Signal that the header is included from here. */
28	#include "VDICore.h"
29	#include <VBox/err.h>
30
31	#include <VBox/log.h>
32	#include <iprt/alloc.h>
33	#include <iprt/assert.h>
34	#include <iprt/uuid.h>
35	#include <iprt/file.h>
36	#include <iprt/string.h>
37	#include <iprt/asm.h>
38	#include <iprt/thread.h>
39	#include <iprt/semaphore.h>
40	#include <iprt/md5.h>
41	#include <iprt/tcp.h>
42	#include <iprt/time.h>
43	#include <VBox/scsi.h>
44
45
46	/*******************************************************************************
47	* Defined Constants And Macros *
48	*******************************************************************************/
49
50	/** Default port number to use for iSCSI. */
51	#define ISCSI_DEFAULT_PORT 3260
52
53
54	/** Converts a number in the range of 0 - 15 into the corresponding hex char. */
55	#define NUM_2_HEX(b) ('0' + (b) + (((b) > 9) ? 39 : 0))
56	/** Converts a hex char into the corresponding number in the range 0-15. */
57	#define HEX_2_NUM(c) (((c) <= '9') ? ((c) - '0') : (((c - 'A' + 10) & 0xf)))
58	/* Converts a base64 char into the corresponding number in the range 0-63. */
59	#define B64_2_NUM(c) ((c >= 'A' && c <= 'Z') ? (c - 'A') : (c >= 'a' && c <= 'z') ? (c - 'a' + 26) : (c >= '0' && c <= '9') ? (c - '0' + 52) : (c == '+') ? 62 : (c == '/') ? 63 : -1)
60
61
62	/** Minumum CHAP_MD5 challenge length in bytes. */
63	#define CHAP_MD5_CHALLENGE_MIN 16
64	/** Maximum CHAP_MD5 challenge length in bytes. */
65	#define CHAP_MD5_CHALLENGE_MAX 24
66
67
68	/**
69	* SCSI peripheral device type. */
70	typedef enum SCSIDEVTYPE
71	{
72	/** direct-access device. */
73	SCSI_DEVTYPE_DISK = 0,
74	/** sequential-access device. */
75	SCSI_DEVTYPE_TAPE,
76	/** printer device. */
77	SCSI_DEVTYPE_PRINTER,
78	/** processor device. */
79	SCSI_DEVTYPE_PROCESSOR,
80	/** write-once device. */
81	SCSI_DEVTYPE_WORM,
82	/** CD/DVD device. */
83	SCSI_DEVTYPE_CDROM,
84	/** scanner device. */
85	SCSI_DEVTYPE_SCANNER,
86	/** optical memory device. */
87	SCSI_DEVTYPE_OPTICAL,
88	/** medium changer. */
89	SCSI_DEVTYPE_CHANGER,
90	/** communications device. */
91	SCSI_DEVTYPE_COMMUNICATION,
92	/** storage array controller device. */
93	SCSI_DEVTYPE_RAIDCTL = 0x0c,
94	/** enclosure services device. */
95	SCSI_DEVTYPE_ENCLOSURE,
96	/** simplified direct-access device. */
97	SCSI_DEVTYPE_SIMPLEDISK,
98	/** optical card reader/writer device. */
99	SCSI_DEVTYPE_OCRW,
100	/** bridge controller device. */
101	SCSI_DEVTYPE_BRIDGE,
102	/** object-based storage device. */
103	SCSI_DEVTYPE_OSD
104	} SCSIDEVTYPE;
105
106	/** Mask for extracting the SCSI device type out of the first byte of the INQUIRY response. */
107	#define SCSI_DEVTYPE_MASK 0x1f
108
109
110	/** Maximum PDU size we can handle in one piece. */
111	#define ISCSI_RECV_PDU_BUFFER_SIZE (65536 + ISCSI_BHS_SIZE)
112
113
114	/** Version of the iSCSI standard which this initiator driver can handle. */
115	#define ISCSI_MY_VERSION 0
116
117
118	/** Length of ISCSI basic header segment. */
119	#define ISCSI_BHS_SIZE 48
120
121
122	/** Reserved task tag value. */
123	#define ISCSI_TASK_TAG_RSVD 0xffffffff
124
125
126	/**
127	* iSCSI opcodes. */
128	typedef enum ISCSIOPCODE
129	{
130	/** NOP-Out. */
131	ISCSIOP_NOP_OUT = 0x00000000,
132	/** SCSI command. */
133	ISCSIOP_SCSI_CMD = 0x01000000,
134	/** SCSI task management request. */
135	ISCSIOP_SCSI_TASKMGMT_REQ = 0x02000000,
136	/** Login request. */
137	ISCSIOP_LOGIN_REQ = 0x03000000,
138	/** Text request. */
139	ISCSIOP_TEXT_REQ = 0x04000000,
140	/** SCSI Data-Out. */
141	ISCSIOP_SCSI_DATA_OUT = 0x05000000,
142	/** Logout request. */
143	ISCSIOP_LOGOUT_REQ = 0x06000000,
144	/** SNACK request. */
145	ISCSIOP_SNACK_REQ = 0x10000000,
146
147	/** NOP-In. */
148	ISCSIOP_NOP_IN = 0x20000000,
149	/** SCSI response. */
150	ISCSIOP_SCSI_RES = 0x21000000,
151	/** SCSI Task Management response. */
152	ISCSIOP_SCSI_TASKMGMT_RES = 0x22000000,
153	/** Login response. */
154	ISCSIOP_LOGIN_RES = 0x23000000,
155	/** Text response. */
156	ISCSIOP_TEXT_RES = 0x24000000,
157	/** SCSI Data-In. */
158	ISCSIOP_SCSI_DATA_IN = 0x25000000,
159	/** Logout response. */
160	ISCSIOP_LOGOUT_RES = 0x26000000,
161	/** Ready To Transfer (R2T). */
162	ISCSIOP_R2T = 0x31000000,
163	/** Asynchronous message. */
164	ISCSIOP_ASYN_MSG = 0x32000000,
165	/** Reject. */
166	ISCSIOP_REJECT = 0x3f000000
167	} ISCSIOPCODE;
168
169	/** Mask for extracting the iSCSI opcode out of the first header word. */
170	#define ISCSIOP_MASK 0x3f000000
171
172
173	/** ISCSI BHS word 0: Request should be processed immediately. */
174	#define ISCSI_IMMEDIATE_DELIVERY_BIT 0x40000000
175
176	/** ISCSI BHS word 0: This is the final PDU for this request/response. */
177	#define ISCSI_FINAL_BIT 0x00800000
178	/** ISCSI BHS word 0: Mask for extracting the CSG. */
179	#define ISCSI_CSG_MASK 0x000c0000
180	/** ISCSI BHS word 0: Shift offset for extracting the CSG. */
181	#define ISCSI_CSG_SHIFT 18
182	/** ISCSI BHS word 0: Mask for extracting the NSG. */
183	#define ISCSI_NSG_MASK 0x00030000
184	/** ISCSI BHS word 0: Shift offset for extracting the NSG. */
185	#define ISCSI_NSG_SHIFT 16
186
187	/** ISCSI BHS word 0: task attribute untagged */
188	#define ISCSI_TASK_ATTR_UNTAGGED 0x00000000
189	/** ISCSI BHS word 0: task attribute simple */
190	#define ISCSI_TASK_ATTR_SIMPLE 0x00010000
191	/** ISCSI BHS word 0: task attribute ordered */
192	#define ISCSI_TASK_ATTR_ORDERED 0x00020000
193	/** ISCSI BHS word 0: task attribute head of queue */
194	#define ISCSI_TASK_ATTR_HOQ 0x00030000
195	/** ISCSI BHS word 0: task attribute ACA */
196	#define ISCSI_TASK_ATTR_ACA 0x00040000
197
198	/** ISCSI BHS word 0: transit to next login phase. */
199	#define ISCSI_TRANSIT_BIT 0x00800000
200	/** ISCSI BHS word 0: continue with login negotiation. */
201	#define ISCSI_CONTINUE_BIT 0x00400000
202
203	/** ISCSI BHS word 0: residual underflow. */
204	#define ISCSI_RESIDUAL_UNFL_BIT 0x00020000
205	/** ISCSI BHS word 0: residual overflow. */
206	#define ISCSI_RESIDUAL_OVFL_BIT 0x00040000
207	/** ISCSI BHS word 0: Bidirectional read residual underflow. */
208	#define ISCSI_BI_READ_RESIDUAL_UNFL_BIT 0x00080000
209	/** ISCSI BHS word 0: Bidirectional read residual overflow. */
210	#define ISCSI_BI_READ_RESIDUAL_OVFL_BIT 0x00100000
211
212	/** ISCSI BHS word 0: SCSI response mask. */
213	#define ISCSI_SCSI_RESPONSE_MASK 0x0000ff00
214	/** ISCSI BHS word 0: SCSI status mask. */
215	#define ISCSI_SCSI_STATUS_MASK 0x000000ff
216
217	/** ISCSI BHS word 0: response includes status. */
218	#define ISCSI_STATUS_BIT 0x00010000
219
220
221	/**
222	* iSCSI login status class. */
223	typedef enum ISCSILOGINSTATUSCLASS
224	{
225	/** Success. */
226	ISCSI_LOGIN_STATUS_CLASS_SUCCESS = 0,
227	/** Redirection. */
228	ISCSI_LOGIN_STATUS_CLASS_REDIRECTION,
229	/** Initiator error. */
230	ISCSI_LOGIN_STATUS_CLASS_INITIATOR_ERROR,
231	/** Target error. */
232	ISCSI_LOGIN_STATUS_CLASS_TARGET_ERROR
233	} ISCSILOGINSTATUSCLASS;
234
235
236	/**
237	* iSCSI connection state. */
238	typedef enum ISCSISTATE
239	{
240	/** Not having a connection/session at all. */
241	ISCSISTATE_FREE,
242	/** Currently trying to login. */
243	ISCSISTATE_IN_LOGIN,
244	/** Normal operation, corresponds roughly to the Full Feature Phase. */
245	ISCSISTATE_NORMAL,
246	/** Currently trying to logout. */
247	ISCSISTATE_IN_LOGOUT
248	} ISCSISTATE;
249
250
251	/*******************************************************************************
252	* Structures and Typedefs *
253	*******************************************************************************/
254	/**
255	* Block driver instance data.
256	*/
257	typedef struct ISCSIIMAGE
258	{
259	/** Pointer to the filename (location). Not really used. */
260	const char *pszFilename;
261	/** Pointer to the initiator name. */
262	char *pszInitiatorName;
263	/** Pointer to the target name. */
264	char *pszTargetName;
265	/** Pointer to the target address. */
266	char *pszTargetAddress;
267	/** Pointer to the user name for authenticating the Initiator. */
268	char *pszInitiatorUsername;
269	/** Pointer to the secret for authenticating the Initiator. */
270	uint8_t *pbInitiatorSecret;
271	/** Length of the secret for authenticating the Initiator. */
272	size_t cbInitiatorSecret;
273	/** Pointer to the user name for authenticating the Target. */
274	char *pszTargetUsername;
275	/** Pointer to the secret for authenticating the Initiator. */
276	uint8_t *pbTargetSecret;
277	/** Length of the secret for authenticating the Initiator. */
278	size_t cbTargetSecret;
279	/** Initiator session identifier. */
280	uint64_t ISID;
281	/** SCSI Logical Unit Number. */
282	uint64_t LUN;
283	/** Pointer to the per-disk VD interface list. */
284	PVDINTERFACE pVDIfsDisk;
285	/** Error interface. */
286	PVDINTERFACE pInterfaceError;
287	/** Error interface callback table. */
288	PVDINTERFACEERROR pInterfaceErrorCallbacks;
289	/** TCP network stack interface. */
290	PVDINTERFACE pInterfaceNet;
291	/** TCP network stack interface callback table. */
292	PVDINTERFACETCPNET pInterfaceNetCallbacks;
293	/** Pointer to the per-image VD interface list. */
294	PVDINTERFACE pVDIfsImage;
295	/** Config interface. */
296	PVDINTERFACE pInterfaceConfig;
297	/** Config interface callback table. */
298	PVDINTERFACECONFIG pInterfaceConfigCallbacks;
299	/** Image open flags. */
300	unsigned uOpenFlags;
301	/** Number of re-login retries when a connection fails. */
302	uint32_t cISCSIRetries;
303	/** Size of volume in sectors. */
304	uint32_t cVolume;
305	/** Sector size on volume. */
306	uint32_t cbSector;
307	/** Total volume size in bytes. Easiert that multiplying the above values all the time. */
308	uint64_t cbSize;
309	/** Current state of the connection/session. */
310	ISCSISTATE state;
311	/** Flag whether the first Login Response PDU has been seen. */
312	bool FirstRecvPDU;
313	/** Initiator Task Tag of the last iSCSI request PDU. */
314	uint32_t ITT;
315	/** Sequence number of the last command. */
316	uint32_t CmdSN;
317	/** Sequence number of the next command expected by the target. */
318	uint32_t ExpCmdSN;
319	/** Maximum sequence number accepted by the target (determines size of window). */
320	uint32_t MaxCmdSN;
321	/** Expected sequence number of next status. */
322	uint32_t ExpStatSN;
323	/** Currently active request. */
324	PISCSIREQ paCurrReq;
325	/** Segment number of currently active request. */
326	uint32_t cnCurrReq;
327	/** Pointer to receive PDU buffer. (Freed by RT) */
328	void *pvRecvPDUBuf;
329	/** Length of receive PDU buffer. */
330	size_t cbRecvPDUBuf;
331	/** Mutex protecting against concurrent use from several threads. */
332	RTSEMMUTEX Mutex;
333
334	/** Pointer to the target hostname. */
335	char *pszHostname;
336	/** Pointer to the target hostname. */
337	uint32_t uPort;
338	/** Socket handle of the TCP connection. */
339	RTSOCKET Socket;
340	/** Timeout for read operations on the TCP connection (in milliseconds). */
341	uint32_t uReadTimeout;
342	/** Flag whether to use the host IP stack or DevINIP. */
343	bool fHostIP;
344	} ISCSIIMAGE, *PISCSIIMAGE;
345
346
347	/**
348	* SCSI transfer directions.
349	*/
350	typedef enum SCSIXFER
351	{
352	SCSIXFER_NONE = 0,
353	SCSIXFER_TO_TARGET,
354	SCSIXFER_FROM_TARGET,
355	SCSIXFER_TO_FROM_TARGET
356	} SCSIXFER, *PSCSIXFER;
357
358
359	/**
360	* SCSI request structure.
361	*/
362	typedef struct SCSIREQ
363	{
364	/** Transfer direction. */
365	SCSIXFER enmXfer;
366	/** Length of command block. */
367	size_t cbCmd;
368	/** Length of Initiator2Target data buffer. */
369	size_t cbI2TData;
370	/** Length of Target2Initiator data buffer. */
371	size_t cbT2IData;
372	/** Length of sense buffer. */
373	size_t cbSense;
374	/** Completion status of the command. */
375	uint8_t status;
376	/** Pointer to command block. */
377	void *pvCmd;
378	/** Pointer to Initiator2Target data buffer. */
379	const void *pcvI2TData;
380	/** Pointer to Target2Initiator data buffer. */
381	void *pvT2IData;
382	/** Pointer to sense buffer. */
383	void *pvSense;
384	} SCSIREQ, *PSCSIREQ;
385
386
387	/*******************************************************************************
388	* Static Variables *
389	*******************************************************************************/
390
391	/** Counter for getting unique instance IDs. */
392	static uint32_t s_u32iscsiID = 0;
393
394	/** Default LUN. */
395	static const char *s_iscsiConfigDefaultLUN = "0";
396
397	/** Default initiator name. */
398	static const char *s_iscsiConfigDefaultInitiatorName = "iqn.2008-04.com.sun.virtualbox.initiator";
399
400	/** Default timeout, 10 seconds. */
401	static const char *s_iscsiConfigDefaultTimeout = "10000";
402
403	/** Default host IP stack. */
404	static const char *s_iscsiConfigDefaultHostIPStack = "1";
405
406	/** Description of all accepted config parameters. */
407	static const VDCONFIGINFO s_iscsiConfigInfo[] =
408	{
409	{ "TargetName", NULL, VDCFGVALUETYPE_STRING, VD_CFGKEY_MANDATORY },
410	/* LUN is defined of string type to handle the "enc" prefix. */
411	{ "LUN", s_iscsiConfigDefaultLUN, VDCFGVALUETYPE_STRING, VD_CFGKEY_MANDATORY },
412	{ "TargetAddress", NULL, VDCFGVALUETYPE_STRING, VD_CFGKEY_MANDATORY },
413	{ "InitiatorName", s_iscsiConfigDefaultInitiatorName, VDCFGVALUETYPE_STRING, 0 },
414	{ "InitiatorUsername", NULL, VDCFGVALUETYPE_STRING, 0 },
415	{ "InitiatorSecret", NULL, VDCFGVALUETYPE_BYTES, 0 },
416	{ "TargetUsername", NULL, VDCFGVALUETYPE_STRING, VD_CFGKEY_EXPERT },
417	{ "TargetSecret", NULL, VDCFGVALUETYPE_BYTES, VD_CFGKEY_EXPERT },
418	{ "Timeout", s_iscsiConfigDefaultTimeout, VDCFGVALUETYPE_INTEGER, VD_CFGKEY_EXPERT },
419	{ "HostIPStack", s_iscsiConfigDefaultHostIPStack, VDCFGVALUETYPE_INTEGER, VD_CFGKEY_EXPERT },
420	{ NULL, NULL, VDCFGVALUETYPE_INTEGER, 0 }
421	};
422
423	/*******************************************************************************
424	* Internal Functions *
425	*******************************************************************************/
426
427	/* iSCSI low-level functions (only to be used from the iSCSI high-level functions). */
428	static uint32_t iscsiNewITT(PISCSIIMAGE pImage);
429	static int iscsiSendPDU(PISCSIIMAGE pImage, PISCSIREQ paReq, uint32_t cnReq);
430	static int iscsiRecvPDU(PISCSIIMAGE pImage, uint32_t itt, PISCSIRES paRes, uint32_t cnRes);
431	static int drvISCSIValidatePDU(PISCSIRES paRes, uint32_t cnRes);
432	static int iscsiTextAddKeyValue(uint8_t pbBuf, size_t cbBuf, size_t pcbBufCurr, const char pcszKey, const char pcszValue, size_t cbValue);
433	static int iscsiTextGetKeyValue(const uint8_t pbBuf, size_t cbBuf, const char pcszKey, const char **ppcszValue);
434	static int iscsiStrToBinary(const char pcszValue, uint8_t pbValue, size_t *pcbValue);
435
436	/* Serial number arithmetic comparison. */
437	static bool serial_number_less(uint32_t sn1, uint32_t sn2);
438
439	/* CHAP-MD5 functions. */
440	#ifdef IMPLEMENT_TARGET_AUTH
441	static void chap_md5_generate_challenge(uint8_t pbChallenge, size_t pcbChallenge);
442	#endif
443	static void chap_md5_compute_response(uint8_t pbResponse, uint8_t id, const uint8_t pbChallenge, size_t cbChallenge,
444	const uint8_t *pbSecret, size_t cbSecret);
445
446
447	/**
448	* Internal: signal an error to the frontend.
449	*/
450	DECLINLINE(int) iscsiError(PISCSIIMAGE pImage, int rc, RT_SRC_POS_DECL,
451	const char *pszFormat, ...)
452	{
453	va_list va;
454	va_start(va, pszFormat);
455	if (pImage->pInterfaceError)
456	pImage->pInterfaceErrorCallbacks->pfnError(pImage->pInterfaceError->pvUser, rc, RT_SRC_POS_ARGS,
457	pszFormat, va);
458	va_end(va);
459	return rc;
460	}
461
462
463	static int iscsiTransportRead(PISCSIIMAGE pImage, PISCSIRES paResponse, unsigned int cnResponse)
464	{
465	int rc = VINF_SUCCESS;
466	unsigned int i = 0;
467	size_t cbToRead, cbActuallyRead, residual, cbSegActual = 0, cbAHSLength, cbDataLength;
468	char *pDst;
469
470	LogFlowFunc(("cnResponse=%d (%s:%d)\n", cnResponse, pImage->pszHostname, pImage->uPort));
471	if (pImage->Socket == NIL_RTSOCKET)
472	{
473	/* Attempt to reconnect if the connection was previously broken. */
474	if (pImage->pszHostname != NULL)
475	{
476	rc = pImage->pInterfaceNetCallbacks->pfnClientConnect(pImage->pszHostname, pImage->uPort, &pImage->Socket);
477	if (RT_UNLIKELY( RT_FAILURE(rc)
478	&& ( rc == VERR_NET_CONNECTION_REFUSED
479	\|\| rc == VERR_NET_CONNECTION_RESET
480	\|\| rc == VERR_NET_UNREACHABLE
481	\|\| rc == VERR_NET_HOST_UNREACHABLE
482	\|\| rc == VERR_NET_CONNECTION_TIMED_OUT)))
483	{
484	/* Standardize return value for no connection. */
485	rc = VERR_NET_CONNECTION_REFUSED;
486	}
487	}
488	}
489
490	if (RT_SUCCESS(rc) && paResponse[0].cbSeg >= 48)
491	{
492	cbToRead = 0;
493	residual = 48; /* Do not read more than the BHS length before the true PDU length is known. */
494	cbSegActual = residual;
495	pDst = (char *)paResponse[i].pvSeg;
496	uint64_t u64Timeout = RTTimeMilliTS() + pImage->uReadTimeout;
497	do
498	{
499	int64_t cMilliesRemaining = u64Timeout - RTTimeMilliTS();
500	if (cMilliesRemaining <= 0)
501	{
502	rc = VERR_TIMEOUT;
503	break;
504	}
505	Assert(cMilliesRemaining < 1000000);
506	rc = pImage->pInterfaceNetCallbacks->pfnSelectOne(pImage->Socket,
507	cMilliesRemaining);
508	if (RT_FAILURE(rc))
509	break;
510	rc = pImage->pInterfaceNetCallbacks->pfnRead(pImage->Socket,
511	pDst, residual,
512	&cbActuallyRead);
513	if (RT_FAILURE(rc))
514	break;
515	if (cbActuallyRead == 0)
516	{
517	/* The other end has closed the connection. */
518	pImage->pInterfaceNetCallbacks->pfnClientClose(pImage->Socket);
519	pImage->Socket = NIL_RTSOCKET;
520	rc = VERR_NET_CONNECTION_RESET;
521	break;
522	}
523	if (cbToRead == 0)
524	{
525	/* Currently reading the BHS. */
526	residual -= cbActuallyRead;
527	pDst += cbActuallyRead;
528	if (residual <= 40)
529	{
530	/* Enough data read to figure out the actual PDU size. */
531	uint32_t word1 = RT_N2H_U32(((uint32_t *)(paResponse[0].pvSeg))[1]);
532	cbAHSLength = (word1 & 0xff000000) >> 24;
533	cbAHSLength = ((cbAHSLength - 1) \| 3) + 1; /* Add padding. */
534	cbDataLength = word1 & 0x00ffffff;
535	cbDataLength = ((cbDataLength - 1) \| 3) + 1; /* Add padding. */
536	cbToRead = residual + cbAHSLength + cbDataLength;
537	residual += paResponse[0].cbSeg - 48;
538	if (residual > cbToRead)
539	residual = cbToRead;
540	cbSegActual = 48 + cbAHSLength + cbDataLength;
541	/* Check whether we are already done with this PDU (no payload). */
542	if (cbToRead == 0)
543	break;
544	}
545	}
546	else
547	{
548	cbToRead -= cbActuallyRead;
549	if (cbToRead == 0)
550	break;
551	pDst += cbActuallyRead;
552	residual -= cbActuallyRead;
553	}
554	if (residual == 0)
555	{
556	i++;
557	if (i >= cnResponse)
558	{
559	/* No space left in receive buffers. */
560	rc = VERR_BUFFER_OVERFLOW;
561	break;
562	}
563	pDst = (char *)paResponse[i].pvSeg;
564	residual = paResponse[i].cbSeg;
565	if (residual > cbToRead)
566	residual = cbToRead;
567	cbSegActual = residual;
568	}
569	} while (true);
570	}
571	else
572	{
573	if (RT_SUCCESS(rc))
574	rc = VERR_BUFFER_OVERFLOW;
575	}
576	if (RT_SUCCESS(rc))
577	{
578	paResponse[i].cbSeg = cbSegActual;
579	for (i++; i < cnResponse; i++)
580	paResponse[i].cbSeg = 0;
581	}
582
583	if (RT_UNLIKELY( RT_FAILURE(rc)
584	&& ( rc == VERR_NET_CONNECTION_RESET
585	\|\| rc == VERR_NET_CONNECTION_ABORTED
586	\|\| rc == VERR_NET_CONNECTION_RESET_BY_PEER
587	\|\| rc == VERR_NET_CONNECTION_REFUSED
588	\|\| rc == VERR_BROKEN_PIPE)))
589	{
590	/* Standardize return value for broken connection. */
591	rc = VERR_BROKEN_PIPE;
592	}
593
594	LogFlowFunc(("returns %Rrc\n", rc));
595	return rc;
596	}
597
598
599	static int iscsiTransportWrite(PISCSIIMAGE pImage, PISCSIREQ paRequest, unsigned int cnRequest)
600	{
601	int rc = VINF_SUCCESS;
602	uint32_t pad = 0;
603	unsigned int i;
604
605	LogFlow(("drvISCSITransportTcpWrite: cnRequest=%d (%s:%d)\n", cnRequest, pImage->pszHostname, pImage->uPort));
606	if (pImage->Socket == NIL_RTSOCKET)
607	{
608	/* Attempt to reconnect if the connection was previously broken. */
609	if (pImage->pszHostname != NULL)
610	{
611	rc = pImage->pInterfaceNetCallbacks->pfnClientConnect(pImage->pszHostname, pImage->uPort, &pImage->Socket);
612	if (RT_UNLIKELY( RT_FAILURE(rc)
613	&& ( rc == VERR_NET_CONNECTION_REFUSED
614	\|\| rc == VERR_NET_CONNECTION_RESET
615	\|\| rc == VERR_NET_UNREACHABLE
616	\|\| rc == VERR_NET_HOST_UNREACHABLE
617	\|\| rc == VERR_NET_CONNECTION_TIMED_OUT)))
618	{
619	/* Standardize return value for no connection. */
620	rc = VERR_NET_CONNECTION_REFUSED;
621	}
622	}
623	}
624
625	if (RT_SUCCESS(rc))
626	{
627	for (i = 0; i < cnRequest; i++)
628	{
629	/* Write one chunk of data. */
630	rc = pImage->pInterfaceNetCallbacks->pfnWrite(pImage->Socket,
631	paRequest[i].pcvSeg,
632	paRequest[i].cbSeg);
633	if (RT_FAILURE(rc))
634	break;
635	/* Insert proper padding before the next chunk us written. */
636	if (paRequest[i].cbSeg & 3)
637	{
638	rc = pImage->pInterfaceNetCallbacks->pfnWrite(pImage->Socket,
639	&pad,
640	4 - (paRequest[i].cbSeg & 3));
641	if (RT_FAILURE(rc))
642	break;
643	}
644	}
645	/* Send out the request as soon as possible, otherwise the target will
646	* answer after an unnecessary delay. */
647	pImage->pInterfaceNetCallbacks->pfnFlush(pImage->Socket);
648	}
649
650	if (RT_UNLIKELY( RT_FAILURE(rc)
651	&& ( rc == VERR_NET_CONNECTION_RESET
652	\|\| rc == VERR_NET_CONNECTION_ABORTED
653	\|\| rc == VERR_NET_CONNECTION_RESET_BY_PEER
654	\|\| rc == VERR_NET_CONNECTION_REFUSED
655	\|\| rc == VERR_BROKEN_PIPE)))
656	{
657	/* Standardize return value for broken connection. */
658	rc = VERR_BROKEN_PIPE;
659	}
660
661	LogFlow(("drvISCSITransportTcpWrite: returns %Rrc\n", rc));
662	return rc;
663	}
664
665
666	static int iscsiTransportOpen(PISCSIIMAGE pImage)
667	{
668	int rc = VINF_SUCCESS;
669	size_t cbHostname = 0; /* shut up gcc */
670	const char pcszPort = NULL; / shut up gcc */
671	char *pszPortEnd;
672	uint16_t uPort;
673
674	/* Clean up previous connection data. */
675	if (pImage->Socket != NIL_RTSOCKET)
676	{
677	pImage->pInterfaceNetCallbacks->pfnClientClose(pImage->Socket);
678	pImage->Socket = NIL_RTSOCKET;
679	}
680	if (pImage->pszHostname)
681	{
682	RTMemFree(pImage->pszHostname);
683	pImage->pszHostname = NULL;
684	pImage->uPort = 0;
685	}
686
687	/* Locate the port number via the colon separating the hostname from the port. */
688	if (*pImage->pszTargetAddress)
689	{
690	if (*pImage->pszTargetAddress != '[')
691	{
692	/* Normal hostname or IPv4 dotted decimal. */
693	pcszPort = strchr(pImage->pszTargetAddress, ':');
694	if (pcszPort != NULL)
695	{
696	cbHostname = pcszPort - pImage->pszTargetAddress;
697	pcszPort++;
698	}
699	else
700	cbHostname = strlen(pImage->pszTargetAddress);
701	}
702	else
703	{
704	/* IPv6 literal address. Contains colons, so skip to closing square bracket. */
705	pcszPort = strchr(pImage->pszTargetAddress, ']');
706	if (pcszPort != NULL)
707	{
708	pcszPort++;
709	cbHostname = pcszPort - pImage->pszTargetAddress;
710	if (*pcszPort == '\0')
711	pcszPort = NULL;
712	else if (*pcszPort != ':')
713	rc = VERR_PARSE_ERROR;
714	else
715	pcszPort++;
716	}
717	else
718	rc = VERR_PARSE_ERROR;
719	}
720	}
721	else
722	rc = VERR_PARSE_ERROR;
723
724	/* Now split address into hostname and port. */
725	if (RT_SUCCESS(rc))
726	{
727	pImage->pszHostname = (char *)RTMemAlloc(cbHostname + 1);
728	if (!pImage->pszHostname)
729	rc = VERR_NO_MEMORY;
730	else
731	{
732	memcpy(pImage->pszHostname, pImage->pszTargetAddress, cbHostname);
733	pImage->pszHostname[cbHostname] = '\0';
734	if (pcszPort != NULL)
735	{
736	rc = RTStrToUInt16Ex(pcszPort, &pszPortEnd, 0, &uPort);
737	/* Note that RT_SUCCESS() macro to check the rc value is not strict enough in this case. */
738	if (rc == VINF_SUCCESS && *pszPortEnd == '\0' && uPort != 0)
739	{
740	pImage->uPort = uPort;
741	}
742	else
743	{
744	rc = VERR_PARSE_ERROR;
745	}
746	}
747	else
748	pImage->uPort = ISCSI_DEFAULT_PORT;
749	}
750	}
751
752	if (RT_FAILURE(rc))
753	{
754	if (pImage->pszHostname)
755	{
756	RTMemFree(pImage->pszHostname);
757	pImage->pszHostname = NULL;
758	}
759	pImage->uPort = 0;
760	}
761
762	/* Note that in this implementation the actual connection establishment is
763	* delayed until a PDU is read or written. */
764	LogFlowFunc(("returns %Rrc\n", rc));
765	return rc;
766	}
767
768
769	static int iscsiTransportClose(PISCSIIMAGE pImage)
770	{
771	int rc;
772
773	LogFlowFunc(("(%s:%d)\n", pImage->pszHostname, pImage->uPort));
774	if (pImage->Socket != NIL_RTSOCKET)
775	{
776	rc = pImage->pInterfaceNetCallbacks->pfnClientClose(pImage->Socket);
777	pImage->Socket = NIL_RTSOCKET;
778	}
779	else
780	rc = VINF_SUCCESS;
781	LogFlowFunc(("returns %Rrc\n", rc));
782	return rc;
783	}
784
785
786	/**
787	* Attach to an iSCSI target. Performs all operations necessary to enter
788	* Full Feature Phase.
789	*
790	* @returns VBox status.
791	* @param pImage The iSCSI connection state to be used.
792	*/
793	static int iscsiAttach(PISCSIIMAGE pImage)
794	{
795	int rc;
796	uint32_t itt;
797	uint32_t csg, nsg, substate;
798	uint64_t isid_tsih;
799	uint8_t bBuf[4096]; /* Should be large enough even for large authentication values. */
800	size_t cbBuf;
801	bool transit;
802	uint8_t pbChallenge[1024]; /* RFC3720 specifies this as maximum. */
803	size_t cbChallenge = 0; /* shut up gcc */
804	uint8_t bChapIdx;
805	uint8_t aResponse[RTMD5HASHSIZE];
806	uint32_t cnISCSIReq;
807	ISCSIREQ aISCSIReq[4];
808	uint32_t aReqBHS[12];
809	uint32_t cnISCSIRes;
810	ISCSIRES aISCSIRes[2];
811	uint32_t aResBHS[12];
812	char *pszNext;
813	LogFlowFunc(("entering\n"));
814
815	Assert(pImage->state == ISCSISTATE_FREE);
816
817	RTSemMutexRequest(pImage->Mutex, RT_INDEFINITE_WAIT);
818
819	/* Make 100% sure the connection isn't reused for a new login. */
820	iscsiTransportClose(pImage);
821
822	restart:
823	pImage->state = ISCSISTATE_IN_LOGIN;
824	pImage->ITT = 1;
825	pImage->FirstRecvPDU = true;
826	pImage->CmdSN = 1;
827	pImage->ExpCmdSN = 0;
828	pImage->MaxCmdSN = 1;
829	pImage->ExpStatSN = 1;
830
831	/*
832	* Send login request to target.
833	*/
834	itt = iscsiNewITT(pImage);
835	csg = 0;
836	nsg = 0;
837	substate = 0;
838	isid_tsih = pImage->ISID << 16; /* TSIH field currently always 0 */
839
840	do {
841	transit = false;
842	cbBuf = 0;
843	/* Handle all cases with a single switch statement. */
844	switch (csg << 8 \| substate)
845	{
846	case 0x0000: /* security negotiation, step 0: propose authentication. */
847	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "SessionType", "Normal", 0);
848	if (RT_FAILURE(rc))
849	goto out;
850	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "InitiatorName", pImage->pszInitiatorName, 0);
851	if (RT_FAILURE(rc))
852	goto out;
853	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "TargetName", pImage->pszTargetName, 0);
854	if (RT_FAILURE(rc))
855	goto out;
856	if (pImage->pszInitiatorUsername == NULL)
857	{
858	/* No authentication. Immediately switch to next phase. */
859	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "AuthMethod", "None", 0);
860	if (RT_FAILURE(rc))
861	goto out;
862	nsg = 1;
863	transit = true;
864	}
865	else
866	{
867	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "AuthMethod", "CHAP,None", 0);
868	if (RT_FAILURE(rc))
869	goto out;
870	}
871	break;
872	case 0x0001: /* security negotiation, step 1: propose CHAP_MD5 variant. */
873	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "CHAP_A", "5", 0);
874	if (RT_FAILURE(rc))
875	goto out;
876	break;
877	case 0x0002: /* security negotiation, step 2: send authentication info. */
878	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "CHAP_N", pImage->pszInitiatorUsername, 0);
879	if (RT_FAILURE(rc))
880	goto out;
881	chap_md5_compute_response(aResponse, bChapIdx, pbChallenge, cbChallenge,
882	pImage->pbInitiatorSecret, pImage->cbInitiatorSecret);
883	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "CHAP_R", (const char *)aResponse, RTMD5HASHSIZE);
884	if (RT_FAILURE(rc))
885	goto out;
886	nsg = 1;
887	transit = true;
888	break;
889	case 0x0100: /* login operational negotiation, step 0: set parameters. */
890	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "HeaderDigest", "None", 0);
891	if (RT_FAILURE(rc))
892	goto out;
893	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "DataDigest", "None", 0);
894	if (RT_FAILURE(rc))
895	goto out;
896	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "MaxConnections", "1", 0);
897	if (RT_FAILURE(rc))
898	goto out;
899	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "InitialR2T", "No", 0);
900	if (RT_FAILURE(rc))
901	goto out;
902	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "ImmediateData", "Yes", 0);
903	if (RT_FAILURE(rc))
904	goto out;
905	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "MaxRecvDataSegmentLength", "65536", 0);
906	if (RT_FAILURE(rc))
907	goto out;
908	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "MaxBurstLength", "262144", 0);
909	if (RT_FAILURE(rc))
910	goto out;
911	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "FirstBurstLength", "65536", 0);
912	if (RT_FAILURE(rc))
913	goto out;
914	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "DefaultTime2Wait", "0", 0);
915	if (RT_FAILURE(rc))
916	goto out;
917	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "DefaultTime2Retain", "60", 0);
918	if (RT_FAILURE(rc))
919	goto out;
920	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "DataPDUInOrder", "Yes", 0);
921	if (RT_FAILURE(rc))
922	goto out;
923	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "DataSequenceInOrder", "Yes", 0);
924	if (RT_FAILURE(rc))
925	goto out;
926	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "ErrorRecoveryLevel", "0", 0);
927	if (RT_FAILURE(rc))
928	goto out;
929	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "MaxOutstandingR2T", "1", 0);
930	if (RT_FAILURE(rc))
931	goto out;
932	nsg = 3;
933	transit = true;
934	break;
935	case 0x0300: /* full feature phase. */
936	default:
937	/* Should never come here. */
938	AssertMsgFailed(("send: Undefined login state %d substate %d\n", csg, substate));
939	break;
940	}
941
942	aReqBHS[0] = RT_H2N_U32( ISCSI_IMMEDIATE_DELIVERY_BIT
943	\| (csg << ISCSI_CSG_SHIFT)
944	\| (transit ? (nsg << ISCSI_NSG_SHIFT \| ISCSI_TRANSIT_BIT) : 0)
945	\| ISCSI_MY_VERSION /* Minimum version. */
946	\| (ISCSI_MY_VERSION << 8) /* Maximum version. */
947	\| ISCSIOP_LOGIN_REQ); /* C=0 */
948	aReqBHS[1] = RT_H2N_U32(cbBuf); /* TotalAHSLength=0 */
949	aReqBHS[2] = RT_H2N_U32(isid_tsih >> 32);
950	aReqBHS[3] = RT_H2N_U32(isid_tsih & 0xffffffff);
951	aReqBHS[4] = itt;
952	aReqBHS[5] = RT_H2N_U32(1 << 16); /* CID=1,reserved */
953	aReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
954	aReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
955	aReqBHS[8] = 0; /* reserved */
956	aReqBHS[9] = 0; /* reserved */
957	aReqBHS[10] = 0; /* reserved */
958	aReqBHS[11] = 0; /* reserved */
959
960	cnISCSIReq = 0;
961	aISCSIReq[cnISCSIReq].pcvSeg = aReqBHS;
962	aISCSIReq[cnISCSIReq].cbSeg = sizeof(aReqBHS);
963	cnISCSIReq++;
964
965	aISCSIReq[cnISCSIReq].pcvSeg = bBuf;
966	aISCSIReq[cnISCSIReq].cbSeg = cbBuf;
967	cnISCSIReq++;
968
969	rc = iscsiSendPDU(pImage, aISCSIReq, cnISCSIReq);
970	if (RT_SUCCESS(rc))
971	{
972	ISCSIOPCODE cmd;
973	ISCSILOGINSTATUSCLASS loginStatusClass;
974
975	/* Place login request in queue. */
976	pImage->paCurrReq = aISCSIReq;
977	pImage->cnCurrReq = cnISCSIReq;
978
979	cnISCSIRes = 0;
980	aISCSIRes[cnISCSIRes].pvSeg = aResBHS;
981	aISCSIRes[cnISCSIRes].cbSeg = sizeof(aResBHS);
982	cnISCSIRes++;
983	aISCSIRes[cnISCSIRes].pvSeg = bBuf;
984	aISCSIRes[cnISCSIRes].cbSeg = sizeof(bBuf);
985	cnISCSIRes++;
986
987	rc = iscsiRecvPDU(pImage, itt, aISCSIRes, cnISCSIRes);
988	if (RT_FAILURE(rc))
989	break;
990	/** @todo collect partial login responses with Continue bit set. */
991	Assert(aISCSIRes[0].pvSeg == aResBHS);
992	Assert(aISCSIRes[0].cbSeg >= ISCSI_BHS_SIZE);
993	Assert((RT_N2H_U32(aResBHS[0]) & ISCSI_CONTINUE_BIT) == 0);
994
995	cmd = (ISCSIOPCODE)(RT_N2H_U32(aResBHS[0]) & ISCSIOP_MASK);
996	if (cmd == ISCSIOP_LOGIN_RES)
997	{
998	if ((RT_N2H_U32(aResBHS[0]) & 0xff) != ISCSI_MY_VERSION)
999	{
1000	iscsiTransportClose(pImage);
1001	rc = VERR_PARSE_ERROR;
1002	break; /* Give up immediately, as a RFC violation in version fields is very serious. */
1003	}
1004
1005	loginStatusClass = (ISCSILOGINSTATUSCLASS)(RT_N2H_U32(aResBHS[9]) >> 24);
1006	switch (loginStatusClass)
1007	{
1008	case ISCSI_LOGIN_STATUS_CLASS_SUCCESS:
1009	uint32_t targetCSG;
1010	uint32_t targetNSG;
1011	bool targetTransit;
1012
1013	if (pImage->FirstRecvPDU)
1014	{
1015	pImage->FirstRecvPDU = false;
1016	pImage->ExpStatSN = RT_N2H_U32(aResBHS[6]) + 1;
1017	}
1018
1019	targetCSG = (RT_N2H_U32(aResBHS[0]) & ISCSI_CSG_MASK) >> ISCSI_CSG_SHIFT;
1020	targetNSG = (RT_N2H_U32(aResBHS[0]) & ISCSI_NSG_MASK) >> ISCSI_NSG_SHIFT;
1021	targetTransit = !!(RT_N2H_U32(aResBHS[0]) & ISCSI_TRANSIT_BIT);
1022
1023	/* Handle all cases with a single switch statement. */
1024	switch (csg << 8 \| substate)
1025	{
1026	case 0x0000: /* security negotiation, step 0: receive final authentication. */
1027	const char *pcszAuthMethod;
1028
1029	rc = iscsiTextGetKeyValue(bBuf, aISCSIRes[1].cbSeg, "AuthMethod", &pcszAuthMethod);
1030	if (RT_FAILURE(rc))
1031	{
1032	rc = VERR_PARSE_ERROR;
1033	break;
1034	}
1035	if (strcmp(pcszAuthMethod, "None") == 0)
1036	{
1037	/* Authentication offered, but none required. Skip to operational parameters. */
1038	csg = 1;
1039	nsg = 1;
1040	transit = true;
1041	substate = 0;
1042	break;
1043	}
1044	else if (strcmp(pcszAuthMethod, "CHAP") == 0 && targetNSG == 0 && !targetTransit)
1045	{
1046	/* CHAP authentication required, continue with next substate. */
1047	substate++;
1048	break;
1049	}
1050
1051	/* Unknown auth method or login response PDU headers incorrect. */
1052	rc = VERR_PARSE_ERROR;
1053	break;
1054	case 0x0001: /* security negotiation, step 1: receive final CHAP variant and challenge. */
1055	const char *pcszChapAuthMethod;
1056	const char *pcszChapIdxTarget;
1057	const char *pcszChapChallengeStr;
1058
1059	rc = iscsiTextGetKeyValue(bBuf, aISCSIRes[1].cbSeg, "CHAP_A", &pcszChapAuthMethod);
1060	if (RT_FAILURE(rc))
1061	{
1062	rc = VERR_PARSE_ERROR;
1063	break;
1064	}
1065	if (strcmp(pcszChapAuthMethod, "5") != 0)
1066	{
1067	rc = VERR_PARSE_ERROR;
1068	break;
1069	}
1070	rc = iscsiTextGetKeyValue(bBuf, aISCSIRes[1].cbSeg, "CHAP_I", &pcszChapIdxTarget);
1071	if (RT_FAILURE(rc))
1072	{
1073	rc = VERR_PARSE_ERROR;
1074	break;
1075	}
1076	rc = RTStrToUInt8Ex(pcszChapIdxTarget, &pszNext, 0, &bChapIdx);
1077	if ((rc > VINF_SUCCESS) \|\| *pszNext != '\0')
1078	{
1079	rc = VERR_PARSE_ERROR;
1080	break;
1081	}
1082	rc = iscsiTextGetKeyValue(bBuf, aISCSIRes[1].cbSeg, "CHAP_C", &pcszChapChallengeStr);
1083	if (RT_FAILURE(rc))
1084	{
1085	rc = VERR_PARSE_ERROR;
1086	break;
1087	}
1088	cbChallenge = sizeof(pbChallenge);
1089	rc = iscsiStrToBinary(pcszChapChallengeStr, pbChallenge, &cbChallenge);
1090	if (RT_FAILURE(rc))
1091	break;
1092	substate++;
1093	transit = true;
1094	break;
1095	case 0x0002: /* security negotiation, step 2: check authentication success. */
1096	if (targetCSG == 0 && targetNSG == 1 && targetTransit)
1097	{
1098	/* Target wants to continue in login operational state, authentication success. */
1099	csg = 1;
1100	nsg = 3;
1101	substate = 0;
1102	break;
1103	}
1104	rc = VERR_PARSE_ERROR;
1105	break;
1106	case 0x0100: /* login operational negotiation, step 0: check results. */
1107	if (targetCSG == 1 && targetNSG == 3 && targetTransit)
1108	{
1109	/* Target wants to continue in full feature phase, login finished. */
1110	csg = 3;
1111	nsg = 3;
1112	substate = 0;
1113	break;
1114	}
1115	rc = VERR_PARSE_ERROR;
1116	break;
1117	case 0x0300: /* full feature phase. */
1118	default:
1119	AssertMsgFailed(("recv: Undefined login state %d substate %d\n", csg, substate));
1120	rc = VERR_PARSE_ERROR;
1121	break;
1122	}
1123	break;
1124	case ISCSI_LOGIN_STATUS_CLASS_REDIRECTION:
1125	const char *pcszTargetRedir;
1126
1127	/* Target has moved to some other location, as indicated in the TargetAddress key. */
1128	rc = iscsiTextGetKeyValue(bBuf, aISCSIRes[1].cbSeg, "TargetAddress", &pcszTargetRedir);
1129	if (RT_FAILURE(rc))
1130	{
1131	rc = VERR_PARSE_ERROR;
1132	break;
1133	}
1134	if (pImage->pszTargetAddress)
1135	RTMemFree(pImage->pszTargetAddress);
1136	{
1137	size_t cb = strlen(pcszTargetRedir) + 1;
1138	pImage->pszTargetAddress = (char *)RTMemAlloc(cb);
1139	if (!pImage->pszTargetAddress)
1140	{
1141	rc = VERR_NO_MEMORY;
1142	break;
1143	}
1144	memcpy(pImage->pszTargetAddress, pcszTargetRedir, cb);
1145	}
1146	rc = iscsiTransportOpen(pImage);
1147	goto restart;
1148	case ISCSI_LOGIN_STATUS_CLASS_INITIATOR_ERROR:
1149	iscsiTransportClose(pImage);
1150	pImage->paCurrReq = NULL;
1151	pImage->cnCurrReq = 0;
1152	rc = VERR_IO_GEN_FAILURE;
1153	goto out;
1154	case ISCSI_LOGIN_STATUS_CLASS_TARGET_ERROR:
1155	iscsiTransportClose(pImage);
1156	rc = VINF_EOF;
1157	break;
1158	default:
1159	rc = VERR_PARSE_ERROR;
1160	}
1161
1162	/* Remove login request from queue. */
1163	pImage->paCurrReq = NULL;
1164	pImage->cnCurrReq = 0;
1165
1166	if (csg == 3)
1167	{
1168	/*
1169	* Finished login, continuing with Full Feature Phase.
1170	*/
1171	rc = VINF_SUCCESS;
1172	break;
1173	}
1174	}
1175	else
1176	{
1177	AssertMsgFailed(("%s: ignoring unexpected PDU with first word = %#08x\n", __FUNCTION__, RT_N2H_U32(aResBHS[0])));
1178	}
1179	}
1180	else
1181	break;
1182	} while (true);
1183
1184	out:
1185	if (RT_FAILURE(rc))
1186	{
1187	/*
1188	* Close connection to target.
1189	*/
1190	iscsiTransportClose(pImage);
1191	pImage->state = ISCSISTATE_FREE;
1192	}
1193	else
1194	pImage->state = ISCSISTATE_NORMAL;
1195
1196	RTSemMutexRelease(pImage->Mutex);
1197
1198	LogFlowFunc(("returning %Rrc\n", rc));
1199	LogRel(("iSCSI: login to target %s %s\n", pImage->pszTargetName, RT_SUCCESS(rc) ? "successful" : "failed"));
1200	return rc;
1201	}
1202
1203
1204	/**
1205	* Detach from an iSCSI target.
1206	*
1207	* @returns VBox status.
1208	* @param pImage The iSCSI connection state to be used.
1209	*/
1210	static int iscsiDetach(PISCSIIMAGE pImage)
1211	{
1212	int rc;
1213	uint32_t itt;
1214	uint32_t cnISCSIReq = 0;
1215	ISCSIREQ aISCSIReq[4];
1216	uint32_t aReqBHS[12];
1217	LogFlow(("drvISCSIDetach: entering\n"));
1218
1219	RTSemMutexRequest(pImage->Mutex, RT_INDEFINITE_WAIT);
1220
1221	if (pImage->state != ISCSISTATE_FREE && pImage->state != ISCSISTATE_IN_LOGOUT)
1222	{
1223	pImage->state = ISCSISTATE_IN_LOGOUT;
1224
1225	/*
1226	* Send logout request to target.
1227	*/
1228	itt = iscsiNewITT(pImage);
1229	aReqBHS[0] = RT_H2N_U32(ISCSI_FINAL_BIT \| ISCSIOP_LOGOUT_REQ); /* I=0,F=1,Reason=close session */
1230	aReqBHS[1] = RT_H2N_U32(0); /* TotalAHSLength=0,DataSementLength=0 */
1231	aReqBHS[2] = 0; /* reserved */
1232	aReqBHS[3] = 0; /* reserved */
1233	aReqBHS[4] = itt;
1234	aReqBHS[5] = 0; /* reserved */
1235	aReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
1236	aReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
1237	aReqBHS[8] = 0; /* reserved */
1238	aReqBHS[9] = 0; /* reserved */
1239	aReqBHS[10] = 0; /* reserved */
1240	aReqBHS[11] = 0; /* reserved */
1241	pImage->CmdSN++;
1242
1243	aISCSIReq[cnISCSIReq].pcvSeg = aReqBHS;
1244	aISCSIReq[cnISCSIReq].cbSeg = sizeof(aReqBHS);
1245	cnISCSIReq++;
1246
1247	rc = iscsiSendPDU(pImage, aISCSIReq, cnISCSIReq);
1248	if (RT_SUCCESS(rc))
1249	{
1250	/* Place logout request in queue. */
1251	pImage->paCurrReq = aISCSIReq;
1252	pImage->cnCurrReq = cnISCSIReq;
1253
1254	/*
1255	* Read logout response from target.
1256	*/
1257	ISCSIRES aISCSIRes;
1258	uint32_t aResBHS[12];
1259
1260	aISCSIRes.pvSeg = aResBHS;
1261	aISCSIRes.cbSeg = sizeof(aResBHS);
1262	rc = iscsiRecvPDU(pImage, itt, &aISCSIRes, 1);
1263	if (RT_SUCCESS(rc))
1264	{
1265	if (RT_N2H_U32(aResBHS[0]) != (ISCSI_FINAL_BIT \| ISCSIOP_LOGOUT_RES))
1266	AssertMsgFailed(("iSCSI Logout response invalid\n"));
1267	}
1268	else
1269	AssertMsgFailed(("iSCSI Logout response error, rc=%Rrc\n", rc));
1270
1271	/* Remove logout request from queue. */
1272	pImage->paCurrReq = NULL;
1273	pImage->cnCurrReq = 0;
1274	}
1275	else
1276	AssertMsgFailed(("Could not send iSCSI Logout request, rc=%Rrc\n", rc));
1277	}
1278
1279	if (pImage->state != ISCSISTATE_FREE)
1280	{
1281	/*
1282	* Close connection to target.
1283	*/
1284	rc = iscsiTransportClose(pImage);
1285	if (RT_FAILURE(rc))
1286	AssertMsgFailed(("Could not close connection to target, rc=%Rrc\n", rc));
1287	}
1288
1289	pImage->state = ISCSISTATE_FREE;
1290
1291	RTSemMutexRelease(pImage->Mutex);
1292
1293	LogFlow(("drvISCSIDetach: leaving\n"));
1294	LogRel(("iSCSI: logout to target %s\n", pImage->pszTargetName));
1295	return VINF_SUCCESS;
1296	}
1297
1298
1299	/**
1300	* Perform a command on an iSCSI target. Target must be already in
1301	* Full Feature Phase.
1302	*
1303	* @returns VBOX status.
1304	* @param pImage The iSCSI connection state to be used.
1305	* @param pRequest Command descriptor. Contains all information about
1306	* the command, its transfer directions and pointers
1307	* to the buffer(s) used for transferring data and
1308	* status information.
1309	*/
1310	static int iscsiCommand(PISCSIIMAGE pImage, PSCSIREQ pRequest)
1311	{
1312	int rc;
1313	uint32_t itt;
1314	uint32_t cbData;
1315	uint32_t cnISCSIReq = 0;
1316	ISCSIREQ aISCSIReq[4];
1317	uint32_t aReqBHS[12];
1318
1319	uint32_t *pDst = NULL;
1320	size_t cbBufLength;
1321	uint32_t aStat[64];
1322	uint32_t ExpDataSN = 0;
1323	bool final = false;
1324
1325	LogFlow(("iscsiCommand: entering, CmdSN=%d\n", pImage->CmdSN));
1326
1327	Assert(pRequest->enmXfer != SCSIXFER_TO_FROM_TARGET); /*< @todo not yet supported, would require AHS. /
1328	Assert(pRequest->cbI2TData <= 0xffffff); /* larger transfers would require R2T support. */
1329	Assert(pRequest->cbCmd <= 16); /* would cause buffer overrun below. */
1330
1331	/* If not in normal state, then the transport connection was dropped. Try
1332	* to reestablish by logging in, the target might be responsive again. */
1333	if (pImage->state == ISCSISTATE_FREE)
1334	rc = iscsiAttach(pImage);
1335
1336	/* If still not in normal state, then the underlying transport connection
1337	* cannot be established. Get out before bad things happen (and make
1338	* sure the caller suspends the VM again). */
1339	if (pImage->state != ISCSISTATE_NORMAL)
1340	{
1341	rc = VERR_NET_CONNECTION_REFUSED;
1342	goto out;
1343	}
1344
1345	/*
1346	* Send SCSI command to target with all I2T data included.
1347	*/
1348	cbData = 0;
1349	if (pRequest->enmXfer == SCSIXFER_FROM_TARGET)
1350	cbData = pRequest->cbT2IData;
1351	else
1352	cbData = pRequest->cbI2TData;
1353
1354	RTSemMutexRequest(pImage->Mutex, RT_INDEFINITE_WAIT);
1355
1356	itt = iscsiNewITT(pImage);
1357	memset(aReqBHS, 0, sizeof(aReqBHS));
1358	aReqBHS[0] = RT_H2N_U32( ISCSI_FINAL_BIT \| ISCSI_TASK_ATTR_ORDERED \| ISCSIOP_SCSI_CMD
1359	\| (pRequest->enmXfer << 21)); /* I=0,F=1,Attr=Ordered */
1360	aReqBHS[1] = RT_H2N_U32(0x00000000 \| (pRequest->cbI2TData & 0xffffff)); /* TotalAHSLength=0 */
1361	aReqBHS[2] = RT_H2N_U32(pImage->LUN >> 32);
1362	aReqBHS[3] = RT_H2N_U32(pImage->LUN & 0xffffffff);
1363	aReqBHS[4] = itt;
1364	aReqBHS[5] = RT_H2N_U32(cbData);
1365	aReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
1366	aReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
1367	memcpy(aReqBHS + 8, pRequest->pvCmd, pRequest->cbCmd);
1368	pImage->CmdSN++;
1369
1370	aISCSIReq[cnISCSIReq].pcvSeg = aReqBHS;
1371	aISCSIReq[cnISCSIReq].cbSeg = sizeof(aReqBHS);
1372	cnISCSIReq++;
1373
1374	if ( pRequest->enmXfer == SCSIXFER_TO_TARGET
1375	\|\| pRequest->enmXfer == SCSIXFER_TO_FROM_TARGET)
1376	{
1377	aISCSIReq[cnISCSIReq].pcvSeg = pRequest->pcvI2TData;
1378	aISCSIReq[cnISCSIReq].cbSeg = pRequest->cbI2TData; /* Padding done by transport. */
1379	cnISCSIReq++;
1380	}
1381
1382	rc = iscsiSendPDU(pImage, aISCSIReq, cnISCSIReq);
1383	if (RT_FAILURE(rc))
1384	goto out_release;
1385
1386	/* Place SCSI request in queue. */
1387	pImage->paCurrReq = aISCSIReq;
1388	pImage->cnCurrReq = cnISCSIReq;
1389
1390	/*
1391	* Read SCSI response/data in PDUs from target.
1392	*/
1393	if ( pRequest->enmXfer == SCSIXFER_FROM_TARGET
1394	\|\| pRequest->enmXfer == SCSIXFER_TO_FROM_TARGET)
1395	{
1396	pDst = (uint32_t *)pRequest->pvT2IData;
1397	cbBufLength = pRequest->cbT2IData;
1398	}
1399	else
1400	cbBufLength = 0;
1401
1402	do {
1403	uint32_t cnISCSIRes = 0;
1404	ISCSIRES aISCSIRes[4];
1405	uint32_t aResBHS[12];
1406
1407	aISCSIRes[cnISCSIRes].pvSeg = aResBHS;
1408	aISCSIRes[cnISCSIRes].cbSeg = sizeof(aResBHS);
1409	cnISCSIRes++;
1410	if (cbBufLength != 0 &&
1411	( pRequest->enmXfer == SCSIXFER_FROM_TARGET
1412	\|\| pRequest->enmXfer == SCSIXFER_TO_FROM_TARGET))
1413	{
1414	aISCSIRes[cnISCSIRes].pvSeg = pDst;
1415	aISCSIRes[cnISCSIRes].cbSeg = cbBufLength;
1416	cnISCSIRes++;
1417	}
1418	/* Always reserve space for the status - it's impossible to tell
1419	* beforehand whether this will be the final PDU or not. */
1420	aISCSIRes[cnISCSIRes].pvSeg = aStat;
1421	aISCSIRes[cnISCSIRes].cbSeg = sizeof(aStat);
1422	cnISCSIRes++;
1423
1424	rc = iscsiRecvPDU(pImage, itt, aISCSIRes, cnISCSIRes);
1425	if (RT_FAILURE(rc))
1426	break;
1427
1428	final = !!(RT_N2H_U32(aResBHS[0]) & ISCSI_FINAL_BIT);
1429	ISCSIOPCODE cmd = (ISCSIOPCODE)(RT_N2H_U32(aResBHS[0]) & ISCSIOP_MASK);
1430	if (cmd == ISCSIOP_SCSI_RES)
1431	{
1432	/* This is the final PDU which delivers the status (and may be omitted if
1433	* the last Data-In PDU included successful completion status). */
1434	if (!final \|\| ((RT_N2H_U32(aResBHS[0]) & 0x0000ff00) != 0) \|\| (RT_N2H_U32(aResBHS[9]) != ExpDataSN))
1435	{
1436	/* SCSI Response in the wrong place or with a (target) failure. */
1437	rc = VERR_PARSE_ERROR;
1438	break;
1439	}
1440	pRequest->status = RT_N2H_U32(aResBHS[0]) & 0x000000ff;
1441	uint32_t cbData = RT_N2H_U32(aResBHS[1]) & 0x00ffffff;
1442	if (cbData >= 2)
1443	{
1444	uint32_t cbStat = RT_N2H_U32(aStat[0]) >> 16;
1445	if (cbStat + 2 > cbData \|\| cbStat > pRequest->cbSense)
1446	{
1447	rc = VERR_BUFFER_OVERFLOW;
1448	break;
1449	}
1450	pRequest->cbSense = RT_N2H_U32(aStat[0]) >> 16;
1451	memcpy(pRequest->pvSense, ((const uint8_t *)aStat) + 2, pRequest->cbSense);
1452	}
1453	else if (cbData == 1)
1454	{
1455	rc = VERR_PARSE_ERROR;
1456	break;
1457	}
1458	break;
1459	}
1460	else if (cmd == ISCSIOP_SCSI_DATA_IN)
1461	{
1462	/* A Data-In PDU carries some data that needs to be added to the received
1463	* data in response to the command. There may be both partial and complete
1464	* Data-In PDUs, so collect data until the status is included or the status
1465	* is sent in a separate SCSI Result frame (see above). */
1466	if (final && aISCSIRes[2].cbSeg != 0)
1467	{
1468	/* The received PDU is partially stored in the buffer for status.
1469	* Must not happen under normal circumstances and is a target error. */
1470	rc = VERR_BUFFER_OVERFLOW;
1471	break;
1472	}
1473	uint32_t len = RT_N2H_U32(aResBHS[1]) & 0x00ffffff;
1474	pDst = (uint32_t )((char )pDst + len);
1475	cbBufLength -= len;
1476	ExpDataSN++;
1477	if (final && (RT_N2H_U32(aResBHS[0]) & ISCSI_STATUS_BIT) != 0)
1478	{
1479	pRequest->status = RT_N2H_U32(aResBHS[0]) & 0x000000ff;
1480	pRequest->cbSense = 0;
1481	break;
1482	}
1483	}
1484	else
1485	{
1486	rc = VERR_PARSE_ERROR;
1487	break;
1488	}
1489	} while (true);
1490
1491	/* Remove SCSI request from queue. */
1492	pImage->paCurrReq = NULL;
1493	pImage->cnCurrReq = 0;
1494
1495	out_release:
1496	if (rc == VERR_TIMEOUT)
1497	{
1498	/* Drop connection in case the target plays dead. Much better than
1499	* delaying the next requests until the timed out command actually
1500	* finishes. Also keep in mind that command shouldn't take longer than
1501	* about 30-40 seconds, or the guest will lose its patience. */
1502	iscsiTransportClose(pImage);
1503	pImage->state = ISCSISTATE_FREE;
1504	}
1505	RTSemMutexRelease(pImage->Mutex);
1506
1507	out:
1508	LogFlow(("iscsiCommand: returns %Rrc\n", rc));
1509	return rc;
1510	}
1511
1512
1513	/**
1514	* Generate a new Initiator Task Tag.
1515	*
1516	* @returns Initiator Task Tag.
1517	* @param pImage The iSCSI connection state to be used.
1518	*/
1519	static uint32_t iscsiNewITT(PISCSIIMAGE pImage)
1520	{
1521	uint32_t next_itt;
1522
1523	next_itt = pImage->ITT++;
1524	if (pImage->ITT == ISCSI_TASK_TAG_RSVD)
1525	pImage->ITT = 0;
1526	return RT_H2N_U32(next_itt);
1527	}
1528
1529
1530	/**
1531	* Send an iSCSI request. The request can consist of several segments, which
1532	* are padded to 4 byte boundaries and concatenated.
1533	*
1534	* @returns VBOX status
1535	* @param pImage The iSCSI connection state to be used.
1536	* @param paReq Pointer to array of iSCSI request sections.
1537	* @param cnReq Number of valid iSCSI request sections in the array.
1538	*/
1539	static int iscsiSendPDU(PISCSIIMAGE pImage, PISCSIREQ paReq, uint32_t cnReq)
1540	{
1541	int rc = VINF_SUCCESS;
1542	uint32_t i;
1543	/** @todo return VERR_VD_ISCSI_INVALID_STATE in the appropriate situations,
1544	* needs cleaning up of timeout/disconnect handling a bit, as otherwise
1545	* too many incorrect errors are signalled. */
1546	Assert(pImage->paCurrReq == NULL);
1547	Assert(cnReq >= 1);
1548	Assert(paReq[0].cbSeg >= ISCSI_BHS_SIZE);
1549
1550	for (i = 0; i < pImage->cISCSIRetries; i++)
1551	{
1552	rc = iscsiTransportWrite(pImage, paReq, cnReq);
1553	if (RT_SUCCESS(rc))
1554	break;
1555	if (rc != VERR_BROKEN_PIPE && rc != VERR_NET_CONNECTION_REFUSED)
1556	break;
1557	RTThreadSleep(500);
1558	if ( pImage->state != ISCSISTATE_IN_LOGIN
1559	&& pImage->state != ISCSISTATE_IN_LOGOUT)
1560	{
1561	/* Attempt to re-login when a connection fails, but only when not
1562	* currently logging in or logging out. */
1563	rc = iscsiAttach(pImage);
1564	if (RT_FAILURE(rc))
1565	break;
1566	}
1567	}
1568	return rc;
1569	}
1570
1571
1572	/**
1573	* Wait for an iSCSI response with a matching Initiator Target Tag. The response is
1574	* split into several segments, as requested by the caller-provided buffer specification.
1575	* Remember that the response can be split into several PDUs by the sender, so make
1576	* sure that all parts are collected and processed appropriately by the caller.
1577	*
1578	* @returns VBOX status
1579	* @param pImage The iSCSI connection state to be used.
1580	* @param paRes Pointer to array of iSCSI response sections.
1581	* @param cnRes Number of valid iSCSI response sections in the array.
1582	*/
1583	static int iscsiRecvPDU(PISCSIIMAGE pImage, uint32_t itt, PISCSIRES paRes, uint32_t cnRes)
1584	{
1585	int rc = VINF_SUCCESS;
1586	uint32_t i;
1587	ISCSIRES aResBuf;
1588
1589	for (i = 0; i < pImage->cISCSIRetries; i++)
1590	{
1591	aResBuf.pvSeg = pImage->pvRecvPDUBuf;
1592	aResBuf.cbSeg = pImage->cbRecvPDUBuf;
1593	rc = iscsiTransportRead(pImage, &aResBuf, 1);
1594	if (RT_FAILURE(rc))
1595	{
1596	if (rc == VERR_BROKEN_PIPE \|\| rc == VERR_NET_CONNECTION_REFUSED)
1597	{
1598	/* Connection broken while waiting for a response - wait a while and
1599	* try to restart by re-sending the original request (if any).
1600	* This also handles the connection reestablishment (login etc.). */
1601	RTThreadSleep(500);
1602	if (pImage->paCurrReq != NULL)
1603	{
1604	rc = iscsiSendPDU(pImage, pImage->paCurrReq, pImage->cnCurrReq);
1605	if (RT_FAILURE(rc))
1606	break;
1607	}
1608	}
1609	else
1610	{
1611	/* Signal other errors (VERR_BUFFER_OVERFLOW etc.) to the caller. */
1612	break;
1613	}
1614	}
1615	else
1616	{
1617	ISCSIOPCODE cmd;
1618	const uint32_t pcvResSeg = (const uint32_t )aResBuf.pvSeg;
1619
1620	/* Check whether the received PDU is valid, and update the internal state of
1621	* the iSCSI connection/session. */
1622	rc = drvISCSIValidatePDU(&aResBuf, 1);
1623	if (RT_FAILURE(rc))
1624	continue;
1625	cmd = (ISCSIOPCODE)(RT_N2H_U32(pcvResSeg[0]) & ISCSIOP_MASK);
1626	switch (cmd)
1627	{
1628	case ISCSIOP_SCSI_RES:
1629	case ISCSIOP_SCSI_TASKMGMT_RES:
1630	case ISCSIOP_SCSI_DATA_IN:
1631	case ISCSIOP_R2T:
1632	case ISCSIOP_ASYN_MSG:
1633	case ISCSIOP_TEXT_RES:
1634	case ISCSIOP_LOGIN_RES:
1635	case ISCSIOP_LOGOUT_RES:
1636	case ISCSIOP_REJECT:
1637	case ISCSIOP_NOP_IN:
1638	if (serial_number_less(pImage->MaxCmdSN, RT_N2H_U32(pcvResSeg[8])))
1639	pImage->MaxCmdSN = RT_N2H_U32(pcvResSeg[8]);
1640	if (serial_number_less(pImage->ExpCmdSN, RT_N2H_U32(pcvResSeg[7])))
1641	pImage->ExpCmdSN = RT_N2H_U32(pcvResSeg[7]);
1642	break;
1643	default:
1644	rc = VERR_PARSE_ERROR;
1645	}
1646	if (RT_FAILURE(rc))
1647	continue;
1648	if ( !pImage->FirstRecvPDU
1649	&& (cmd != ISCSIOP_SCSI_DATA_IN \|\| (RT_N2H_U32(pcvResSeg[0]) & ISCSI_STATUS_BIT)))
1650	{
1651	if (pImage->ExpStatSN == RT_N2H_U32(pcvResSeg[6]))
1652	{
1653	/* StatSN counter is not advanced on R2T and on a target SN update NOP-In. */
1654	if ( (cmd != ISCSIOP_R2T)
1655	&& ((cmd != ISCSIOP_NOP_IN) \|\| (RT_N2H_U32(pcvResSeg[4]) != ISCSI_TASK_TAG_RSVD)))
1656	pImage->ExpStatSN++;
1657	}
1658	else
1659	{
1660	rc = VERR_PARSE_ERROR;
1661	continue;
1662	}
1663	}
1664	/* Finally check whether the received PDU matches what the caller wants. */
1665	if (itt == pcvResSeg[4])
1666	{
1667	/* Copy received PDU (one segment) to caller-provided buffers. */
1668	uint32_t i;
1669	size_t cbSeg;
1670	const uint8_t *pSrc;
1671
1672	pSrc = (const uint8_t *)aResBuf.pvSeg;
1673	cbSeg = aResBuf.cbSeg;
1674	for (i = 0; i < cnRes; i++)
1675	{
1676	if (cbSeg > paRes[i].cbSeg)
1677	{
1678	memcpy(paRes[i].pvSeg, pSrc, paRes[i].cbSeg);
1679	pSrc += paRes[i].cbSeg;
1680	cbSeg -= paRes[i].cbSeg;
1681	}
1682	else
1683	{
1684	memcpy(paRes[i].pvSeg, pSrc, cbSeg);
1685	paRes[i].cbSeg = cbSeg;
1686	cbSeg = 0;
1687	break;
1688	}
1689	}
1690	if (cbSeg != 0)
1691	{
1692	rc = VERR_BUFFER_OVERFLOW;
1693	break;
1694	}
1695	for (i++; i < cnRes; i++)
1696	paRes[i].cbSeg = 0;
1697	break;
1698	}
1699	}
1700	}
1701	return rc;
1702	}
1703
1704
1705	/**
1706	* Check the static (not dependent on the connection/session state) validity of an iSCSI response PDU.
1707	*
1708	* @returns VBOX status
1709	* @param paRes Pointer to array of iSCSI response sections.
1710	* @param cnRes Number of valid iSCSI response sections in the array.
1711	*/
1712	static int drvISCSIValidatePDU(PISCSIRES paRes, uint32_t cnRes)
1713	{
1714	const uint32_t *pcrgResBHS;
1715	uint32_t hw0;
1716	Assert(cnRes >= 1);
1717	Assert(paRes[0].cbSeg >= ISCSI_BHS_SIZE);
1718
1719	pcrgResBHS = (const uint32_t *)(paRes[0].pvSeg);
1720	hw0 = RT_N2H_U32(pcrgResBHS[0]);
1721	switch (hw0 & ISCSIOP_MASK)
1722	{
1723	case ISCSIOP_NOP_IN:
1724	/* NOP-In responses must not be split into several PDUs nor it may contain
1725	* ping data for target-initiated pings nor may both task tags be valid task tags. */
1726	if ( (hw0 & ISCSI_FINAL_BIT) == 0
1727	\|\| ( RT_N2H_U32(pcrgResBHS[4]) == ISCSI_TASK_TAG_RSVD
1728	&& RT_N2H_U32(pcrgResBHS[1]) != 0)
1729	\|\| ( RT_N2H_U32(pcrgResBHS[4]) != ISCSI_TASK_TAG_RSVD
1730	&& RT_N2H_U32(pcrgResBHS[5]) != ISCSI_TASK_TAG_RSVD))
1731	return VERR_PARSE_ERROR;
1732	break;
1733	case ISCSIOP_SCSI_RES:
1734	/* SCSI responses must not be split into several PDUs nor must the residual
1735	* bits be contradicting each other nor may the residual bits be set for PDUs
1736	* containing anything else but a completed command response. Underflow
1737	* is no reason for declaring a PDU as invalid, as the target may choose
1738	* to return less data than we assume to get. */
1739	if ( (hw0 & ISCSI_FINAL_BIT) == 0
1740	\|\| ((hw0 & ISCSI_BI_READ_RESIDUAL_OVFL_BIT) && (hw0 & ISCSI_BI_READ_RESIDUAL_UNFL_BIT))
1741	\|\| ((hw0 & ISCSI_RESIDUAL_OVFL_BIT) && (hw0 & ISCSI_RESIDUAL_UNFL_BIT))
1742	\|\| ( ((hw0 & ISCSI_SCSI_RESPONSE_MASK) == 0)
1743	&& ((hw0 & ISCSI_SCSI_STATUS_MASK) == SCSI_STATUS_OK)
1744	&& (hw0 & ( ISCSI_BI_READ_RESIDUAL_OVFL_BIT \| ISCSI_BI_READ_RESIDUAL_UNFL_BIT
1745	\| ISCSI_RESIDUAL_OVFL_BIT))))
1746	return VERR_PARSE_ERROR;
1747	break;
1748	case ISCSIOP_LOGIN_RES:
1749	/* Login responses must not contain contradicting transit and continue bits. */
1750	if ((hw0 & ISCSI_CONTINUE_BIT) && ((hw0 & ISCSI_TRANSIT_BIT) != 0))
1751	return VERR_PARSE_ERROR;
1752	break;
1753	case ISCSIOP_TEXT_RES:
1754	/* Text responses must not contain contradicting final and continue bits nor
1755	* may the final bit be set for PDUs containing a target transfer tag other than
1756	* the reserved transfer tag (and vice versa). */
1757	if ( (((hw0 & ISCSI_CONTINUE_BIT) && (hw0 & ISCSI_FINAL_BIT) != 0))
1758	\|\| (((hw0 & ISCSI_FINAL_BIT) && (RT_N2H_U32(pcrgResBHS[5]) != ISCSI_TASK_TAG_RSVD)))
1759	\|\| (((hw0 & ISCSI_FINAL_BIT) == 0) && (RT_N2H_U32(pcrgResBHS[5]) == ISCSI_TASK_TAG_RSVD)))
1760	return VERR_PARSE_ERROR;
1761	break;
1762	case ISCSIOP_SCSI_DATA_IN:
1763	/* SCSI Data-in responses must not contain contradicting residual bits when
1764	* status bit is set. */
1765	if ((hw0 & ISCSI_STATUS_BIT) && (hw0 & ISCSI_RESIDUAL_OVFL_BIT) && (hw0 & ISCSI_RESIDUAL_UNFL_BIT))
1766	return VERR_PARSE_ERROR;
1767	break;
1768	case ISCSIOP_LOGOUT_RES:
1769	/* Logout responses must not have the final bit unset and may not contain any
1770	* data or additional header segments. */
1771	if ( ((hw0 & ISCSI_FINAL_BIT) == 0)
1772	\|\| (RT_N2H_U32(pcrgResBHS[1]) != 0))
1773	return VERR_PARSE_ERROR;
1774	break;
1775	case ISCSIOP_ASYN_MSG:
1776	/* Asynchronous Messages must not have the final bit unser and may not contain
1777	* an initiator task tag. */
1778	if ( ((hw0 & ISCSI_FINAL_BIT) == 0)
1779	\|\| (RT_N2H_U32(pcrgResBHS[4]) != ISCSI_TASK_TAG_RSVD))
1780	return VERR_PARSE_ERROR;
1781	break;
1782	case ISCSIOP_SCSI_TASKMGMT_RES:
1783	case ISCSIOP_R2T:
1784	case ISCSIOP_REJECT:
1785	default:
1786	/* Do some logging, ignore PDU. */
1787	LogFlow(("drvISCSIValidatePDU: ignore unhandled PDU, first word %#08x\n", RT_N2H_U32(pcrgResBHS[0])));
1788	return VERR_PARSE_ERROR;
1789	}
1790	/* A target must not send PDUs with MaxCmdSN less than ExpCmdSN-1. */
1791
1792	if (serial_number_less(RT_N2H_U32(pcrgResBHS[8]), RT_N2H_U32(pcrgResBHS[7])-1))
1793	return VERR_PARSE_ERROR;
1794
1795	return VINF_SUCCESS;
1796	}
1797
1798
1799	/**
1800	* Appends a key-value pair to the buffer. Normal ASCII strings (cbValue == 0) and large binary values
1801	* of a given length (cbValue > 0) are directly supported. Other value types must be converted to ASCII
1802	* by the caller. Strings must be in UTF-8 encoding.
1803	*
1804	* @returns VBOX status
1805	* @param pbBuf Pointer to the key-value buffer.
1806	* @param cbBuf Length of the key-value buffer.
1807	* @param pcbBufCurr Currently used portion of the key-value buffer.
1808	* @param pszKey Pointer to a string containing the key.
1809	* @param pszValue Pointer to either a string containing the value or to a large binary value.
1810	* @param cbValue Length of the binary value if applicable.
1811	*/
1812	static int iscsiTextAddKeyValue(uint8_t pbBuf, size_t cbBuf, size_t pcbBufCurr, const char *pcszKey,
1813	const char *pcszValue, size_t cbValue)
1814	{
1815	size_t cbBufTmp = *pcbBufCurr;
1816	size_t cbKey = strlen(pcszKey);
1817	size_t cbValueEnc;
1818	uint8_t *pbCurr;
1819
1820	if (cbValue == 0)
1821	cbValueEnc = strlen(pcszValue);
1822	else
1823	cbValueEnc = cbValue * 2 + 2; /* 2 hex bytes per byte, 2 bytes prefix */
1824
1825	if (cbBuf < cbBufTmp + cbKey + 1 + cbValueEnc + 1)
1826	{
1827	/* Buffer would overflow, signal error. */
1828	return VERR_BUFFER_OVERFLOW;
1829	}
1830
1831	/*
1832	* Append a key=value pair (zero terminated string) to the end of the buffer.
1833	*/
1834	pbCurr = pbBuf + cbBufTmp;
1835	memcpy(pbCurr, pcszKey, cbKey);
1836	pbCurr += cbKey;
1837	*pbCurr++ = '=';
1838	if (cbValue == 0)
1839	{
1840	memcpy(pbCurr, pcszValue, cbValueEnc);
1841	pbCurr += cbValueEnc;
1842	}
1843	else
1844	{
1845	*pbCurr++ = '0';
1846	*pbCurr++ = 'x';
1847	for (uint32_t i = 0; i < cbValue; i++)
1848	{
1849	uint8_t b;
1850	b = pcszValue[i];
1851	*pbCurr++ = NUM_2_HEX(b >> 4);
1852	*pbCurr++ = NUM_2_HEX(b & 0xf);
1853	}
1854	}
1855	*pbCurr = '\0';
1856	*pcbBufCurr = cbBufTmp + cbKey + 1 + cbValueEnc + 1;
1857
1858	return VINF_SUCCESS;
1859	}
1860
1861
1862	/**
1863	* Retrieve the value for a given key from the key=value buffer.
1864	*
1865	* @returns VBOX status.
1866	* @param pbBuf Buffer containing key=value pairs.
1867	* @param cbBuf Length of buffer with key=value pairs.
1868	* @param pszKey Pointer to key for which to retrieve the value.
1869	* @param ppszValue Pointer to value string pointer.
1870	*/
1871	static int iscsiTextGetKeyValue(const uint8_t pbBuf, size_t cbBuf, const char pcszKey, const char **ppcszValue)
1872	{
1873	size_t cbKey = strlen(pcszKey);
1874
1875	while (cbBuf != 0)
1876	{
1877	size_t cbKeyValNull = strlen((const char *)pbBuf) + 1;
1878
1879	if (strncmp(pcszKey, (const char *)pbBuf, cbKey) == 0 && pbBuf[cbKey] == '=')
1880	{
1881	ppcszValue = (const char )(pbBuf + cbKey + 1);
1882	return VINF_SUCCESS;
1883	}
1884	pbBuf += cbKeyValNull;
1885	cbBuf -= cbKeyValNull;
1886	}
1887	return VERR_INVALID_NAME;
1888	}
1889
1890
1891	/**
1892	* Convert a long-binary value from a value string to the binary representation.
1893	*
1894	* @returns VBOX status
1895	* @param pszValue Pointer to a string containing the textual value representation.
1896	* @param pbValue Pointer to the value buffer for the binary value.
1897	* @param pcbValue In: length of value buffer, out: actual length of binary value.
1898	*/
1899	static int iscsiStrToBinary(const char pcszValue, uint8_t pbValue, size_t *pcbValue)
1900	{
1901	size_t cbValue = *pcbValue;
1902	char c1, c2, c3, c4;
1903	Assert(cbValue >= 1);
1904
1905	if (strlen(pcszValue) < 3)
1906	return VERR_PARSE_ERROR;
1907	if (*pcszValue++ != '0')
1908	return VERR_PARSE_ERROR;
1909	switch (*pcszValue++)
1910	{
1911	case 'x':
1912	case 'X':
1913	if (strlen(pcszValue) & 1)
1914	{
1915	c1 = *pcszValue++;
1916	*pbValue++ = HEX_2_NUM(c1);
1917	cbValue--;
1918	}
1919	while (*pcszValue != '\0')
1920	{
1921	if (cbValue == 0)
1922	return VERR_BUFFER_OVERFLOW;
1923	c1 = *pcszValue++;
1924	if ((c1 < '0' \|\| c1 > '9') && (c1 < 'a' \|\| c1 > 'f') && (c1 < 'A' \|\| c1 > 'F'))
1925	return VERR_PARSE_ERROR;
1926	c2 = *pcszValue++;
1927	if ((c2 < '0' \|\| c2 > '9') && (c2 < 'a' \|\| c2 > 'f') && (c2 < 'A' \|\| c2 > 'F'))
1928	return VERR_PARSE_ERROR;
1929	*pbValue++ = (HEX_2_NUM(c1) << 4) \| HEX_2_NUM(c2);
1930	cbValue--;
1931	}
1932	*pcbValue -= cbValue;
1933	break;
1934	case 'b':
1935	case 'B':
1936	if ((strlen(pcszValue) & 3) != 0)
1937	return VERR_PARSE_ERROR;
1938	while (*pcszValue != '\0')
1939	{
1940	uint32_t temp;
1941	if (cbValue == 0)
1942	return VERR_BUFFER_OVERFLOW;
1943	c1 = *pcszValue++;
1944	if ((c1 < 'A' \|\| c1 > 'Z') && (c1 < 'a' \|\| c1 >'z') && (c1 < '0' \|\| c1 > '9') && (c1 != '+') && (c1 != '/'))
1945	return VERR_PARSE_ERROR;
1946	c2 = *pcszValue++;
1947	if ((c2 < 'A' \|\| c2 > 'Z') && (c2 < 'a' \|\| c2 >'z') && (c2 < '0' \|\| c2 > '9') && (c2 != '+') && (c2 != '/'))
1948	return VERR_PARSE_ERROR;
1949	c3 = *pcszValue++;
1950	if ((c3 < 'A' \|\| c3 > 'Z') && (c3 < 'a' \|\| c3 >'z') && (c3 < '0' \|\| c3 > '9') && (c3 != '+') && (c3 != '/') && (c3 != '='))
1951	return VERR_PARSE_ERROR;
1952	c4 = *pcszValue++;
1953	if ( (c3 == '=' && c4 != '=')
1954	\|\| ((c4 < 'A' \|\| c4 > 'Z') && (c4 < 'a' \|\| c4 >'z') && (c4 < '0' \|\| c4 > '9') && (c4 != '+') && (c4 != '/') && (c4 != '=')))
1955	return VERR_PARSE_ERROR;
1956	temp = (B64_2_NUM(c1) << 18) \| (B64_2_NUM(c2) << 12);
1957	if (c3 == '=') {
1958	if (*pcszValue != '\0')
1959	return VERR_PARSE_ERROR;
1960	*pbValue++ = temp >> 16;
1961	cbValue--;
1962	} else {
1963	temp \|= B64_2_NUM(c3) << 6;
1964	if (c4 == '=') {
1965	if (*pcszValue != '\0')
1966	return VERR_PARSE_ERROR;
1967	if (cbValue < 2)
1968	return VERR_BUFFER_OVERFLOW;
1969	*pbValue++ = temp >> 16;
1970	*pbValue++ = (temp >> 8) & 0xff;
1971	cbValue -= 2;
1972	}
1973	else
1974	{
1975	temp \|= B64_2_NUM(c4);
1976	if (cbValue < 3)
1977	return VERR_BUFFER_OVERFLOW;
1978	*pbValue++ = temp >> 16;
1979	*pbValue++ = (temp >> 8) & 0xff;
1980	*pbValue++ = temp & 0xff;
1981	cbValue -= 3;
1982	}
1983	}
1984	}
1985	*pcbValue -= cbValue;
1986	break;
1987	default:
1988	return VERR_PARSE_ERROR;
1989	}
1990	return VINF_SUCCESS;
1991	}
1992
1993
1994	static bool serial_number_less(uint32_t s1, uint32_t s2)
1995	{
1996	return (s1 < s2 && s2 - s1 < 0x80000000) \|\| (s1 > s2 && s1 - s2 > 0x80000000);
1997	}
1998
1999
2000	#ifdef IMPLEMENT_TARGET_AUTH
2001	static void chap_md5_generate_challenge(uint8_t pbChallenge, size_t pcbChallenge)
2002	{
2003	uint8_t cbChallenge;
2004
2005	cbChallenge = RTrand_U8(CHAP_MD5_CHALLENGE_MIN, CHAP_MD5_CHALLENGE_MAX);
2006	RTrand_bytes(pbChallenge, cbChallenge);
2007	*pcbChallenge = cbChallenge;
2008	}
2009	#endif
2010
2011
2012	static void chap_md5_compute_response(uint8_t pbResponse, uint8_t id, const uint8_t pbChallenge, size_t cbChallenge,
2013	const uint8_t *pbSecret, size_t cbSecret)
2014	{
2015	RTMD5CONTEXT ctx;
2016	uint8_t bId;
2017
2018	bId = id;
2019	RTMd5Init(&ctx);
2020	RTMd5Update(&ctx, &bId, 1);
2021	RTMd5Update(&ctx, pbSecret, cbSecret);
2022	RTMd5Update(&ctx, pbChallenge, cbChallenge);
2023	RTMd5Final(pbResponse, &ctx);
2024	}
2025
2026	/**
2027	* Internal. Free all allocated space for representing an image, and optionally
2028	* delete the image from disk.
2029	*/
2030	static void iscsiFreeImage(PISCSIIMAGE pImage, bool fDelete)
2031	{
2032	Assert(pImage);
2033	Assert(!fDelete); /* This MUST be false, the flag isn't supported. */
2034
2035	if (pImage->Mutex != NIL_RTSEMMUTEX)
2036	{
2037	/* Detaching only makes sense when the mutex is there. Otherwise the
2038	* failure happened long before we could attach to the target. */
2039	iscsiDetach(pImage);
2040	RTSemMutexDestroy(pImage->Mutex);
2041	pImage->Mutex = NIL_RTSEMMUTEX;
2042	}
2043	if (pImage->pszTargetName)
2044	{
2045	RTMemFree(pImage->pszTargetName);
2046	pImage->pszTargetName = NULL;
2047	}
2048	if (pImage->pszInitiatorName)
2049	{
2050	RTMemFree(pImage->pszInitiatorName);
2051	pImage->pszInitiatorName = NULL;
2052	}
2053	if (pImage->pszInitiatorUsername)
2054	{
2055	RTMemFree(pImage->pszInitiatorUsername);
2056	pImage->pszInitiatorUsername = NULL;
2057	}
2058	if (pImage->pbInitiatorSecret)
2059	{
2060	RTMemFree(pImage->pbInitiatorSecret);
2061	pImage->pbInitiatorSecret = NULL;
2062	}
2063	if (pImage->pszTargetUsername)
2064	{
2065	RTMemFree(pImage->pszTargetUsername);
2066	pImage->pszTargetUsername = NULL;
2067	}
2068	if (pImage->pbTargetSecret)
2069	{
2070	RTMemFree(pImage->pbTargetSecret);
2071	pImage->pbTargetSecret = NULL;
2072	}
2073	if (pImage->pvRecvPDUBuf)
2074	{
2075	RTMemFree(pImage->pvRecvPDUBuf);
2076	pImage->pvRecvPDUBuf = NULL;
2077	}
2078	}
2079
2080	/**
2081	* Internal: Open an image, constructing all necessary data structures.
2082	*/
2083	static int iscsiOpenImage(PISCSIIMAGE pImage, unsigned uOpenFlags)
2084	{
2085	int rc;
2086	char pszLUN = NULL, pszLUNInitial = NULL;
2087	bool fLunEncoded = false;
2088	uint32_t uTimeoutDef = 0;
2089	uint64_t uHostIPTmp = 0;
2090	bool fHostIPDef = 0;
2091	rc = RTStrToUInt32Full(s_iscsiConfigDefaultTimeout, 0, &uTimeoutDef);
2092	AssertRC(rc);
2093	rc = RTStrToUInt64Full(s_iscsiConfigDefaultHostIPStack, 0, &uHostIPTmp);
2094	AssertRC(rc);
2095	fHostIPDef = !!uHostIPTmp;
2096
2097	pImage->uOpenFlags = uOpenFlags;
2098
2099	/* Get error signalling interface. */
2100	pImage->pInterfaceError = VDInterfaceGet(pImage->pVDIfsDisk, VDINTERFACETYPE_ERROR);
2101	if (pImage->pInterfaceError)
2102	pImage->pInterfaceErrorCallbacks = VDGetInterfaceError(pImage->pInterfaceError);
2103
2104	/* Get TCP network stack interface. */
2105	pImage->pInterfaceNet = VDInterfaceGet(pImage->pVDIfsDisk, VDINTERFACETYPE_TCPNET);
2106	if (pImage->pInterfaceNet)
2107	pImage->pInterfaceNetCallbacks = VDGetInterfaceTcpNet(pImage->pInterfaceNet);
2108	else
2109	{
2110	rc = iscsiError(pImage, VERR_VD_ISCSI_UNKNOWN_INTERFACE,
2111	RT_SRC_POS, N_("iSCSI: TCP network stack interface missing"));
2112	goto out;
2113	}
2114
2115	/* Get configuration interface. */
2116	pImage->pInterfaceConfig = VDInterfaceGet(pImage->pVDIfsImage, VDINTERFACETYPE_CONFIG);
2117	if (pImage->pInterfaceConfig)
2118	pImage->pInterfaceConfigCallbacks = VDGetInterfaceConfig(pImage->pInterfaceConfig);
2119	else
2120	{
2121	rc = iscsiError(pImage, VERR_VD_ISCSI_UNKNOWN_INTERFACE,
2122	RT_SRC_POS, N_("iSCSI: configuration interface missing"));
2123	goto out;
2124	}
2125
2126	pImage->ISID = 0x800000000000ULL \| 0x001234560000ULL \| (0x00000000cba0ULL + ASMAtomicIncU32(&s_u32iscsiID));
2127	pImage->cISCSIRetries = 10;
2128	pImage->state = ISCSISTATE_FREE;
2129	pImage->pvRecvPDUBuf = RTMemAlloc(ISCSI_RECV_PDU_BUFFER_SIZE);
2130	pImage->cbRecvPDUBuf = ISCSI_RECV_PDU_BUFFER_SIZE;
2131	if (pImage->pvRecvPDUBuf == NULL)
2132	{
2133	rc = VERR_NO_MEMORY;
2134	goto out;
2135	}
2136	pImage->Mutex = NIL_RTSEMMUTEX;
2137	rc = RTSemMutexCreate(&pImage->Mutex);
2138	if (RT_FAILURE(rc))
2139	goto out;
2140
2141	/* Validate configuration, detect unknown keys. */
2142	if (!VDCFGAreKeysValid(pImage->pInterfaceConfigCallbacks,
2143	pImage->pInterfaceConfig->pvUser,
2144	"TargetName\0InitiatorName\0LUN\0TargetAddress\0InitiatorUsername\0InitiatorSecret\0TargetUsername\0TargetSecret\0Timeout\0HostIPStack\0"))
2145	{
2146	rc = iscsiError(pImage, VERR_VD_ISCSI_UNKNOWN_CFG_VALUES, RT_SRC_POS, N_("iSCSI: configuration error: unknown configuration keys present"));
2147	goto out;
2148	}
2149
2150	/* Query the iSCSI upper level configuration. */
2151	rc = VDCFGQueryStringAlloc(pImage->pInterfaceConfigCallbacks,
2152	pImage->pInterfaceConfig->pvUser,
2153	"TargetName", &pImage->pszTargetName);
2154	if (RT_FAILURE(rc))
2155	{
2156	rc = iscsiError(pImage, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read TargetName as string"));
2157	goto out;
2158	}
2159	rc = VDCFGQueryStringAllocDef(pImage->pInterfaceConfigCallbacks,
2160	pImage->pInterfaceConfig->pvUser,
2161	"InitiatorName", &pImage->pszInitiatorName,
2162	s_iscsiConfigDefaultInitiatorName);
2163	if (RT_FAILURE(rc))
2164	{
2165	rc = iscsiError(pImage, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read InitiatorName as string"));
2166	goto out;
2167	}
2168	rc = VDCFGQueryStringAllocDef(pImage->pInterfaceConfigCallbacks,
2169	pImage->pInterfaceConfig->pvUser,
2170	"LUN", &pszLUN, s_iscsiConfigDefaultLUN);
2171	if (RT_FAILURE(rc))
2172	{
2173	rc = iscsiError(pImage, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read LUN as string"));
2174	goto out;
2175	}
2176	pszLUNInitial = pszLUN;
2177	if (!strncmp(pszLUN, "enc", 3))
2178	{
2179	fLunEncoded = true;
2180	pszLUN += 3;
2181	}
2182	rc = RTStrToUInt64Full(pszLUN, 0, &pImage->LUN);
2183	if (RT_FAILURE(rc))
2184	{
2185	rc = iscsiError(pImage, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to convert LUN to integer"));
2186	goto out;
2187	}
2188	if (!fLunEncoded)
2189	{
2190	if (pImage->LUN <= 255)
2191	{
2192	pImage->LUN = pImage->LUN << 48; /* uses peripheral device addressing method */
2193	}
2194	else if (pImage->LUN <= 16383)
2195	{
2196	pImage->LUN = (pImage->LUN << 48) \| RT_BIT_64(62); /* uses flat space addressing method */
2197	}
2198	else
2199	{
2200	rc = VERR_OUT_OF_RANGE;
2201	rc = iscsiError(pImage, rc, RT_SRC_POS, N_("iSCSI: configuration error: LUN number out of range (0-16383)"));
2202	goto out;
2203	}
2204	}
2205	rc = VDCFGQueryStringAlloc(pImage->pInterfaceConfigCallbacks,
2206	pImage->pInterfaceConfig->pvUser,
2207	"TargetAddress", &pImage->pszTargetAddress);
2208	if (RT_FAILURE(rc))
2209	{
2210	rc = iscsiError(pImage, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read TargetAddress as string"));
2211	goto out;
2212	}
2213	pImage->pszInitiatorUsername = NULL;
2214	rc = VDCFGQueryStringAlloc(pImage->pInterfaceConfigCallbacks,
2215	pImage->pInterfaceConfig->pvUser,
2216	"InitiatorUsername",
2217	&pImage->pszInitiatorUsername);
2218	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
2219	rc = VINF_SUCCESS;
2220	if (RT_FAILURE(rc))
2221	{
2222	rc = iscsiError(pImage, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read InitiatorUsername as string"));
2223	goto out;
2224	}
2225	pImage->pbInitiatorSecret = NULL;
2226	pImage->cbInitiatorSecret = 0;
2227	rc = VDCFGQueryBytesAlloc(pImage->pInterfaceConfigCallbacks,
2228	pImage->pInterfaceConfig->pvUser,
2229	"InitiatorSecret",
2230	(void **)&pImage->pbInitiatorSecret,
2231	&pImage->cbInitiatorSecret);
2232	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
2233	rc = VINF_SUCCESS;
2234	if (RT_FAILURE(rc))
2235	{
2236	rc = iscsiError(pImage, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read InitiatorSecret as byte string"));
2237	goto out;
2238	}
2239	pImage->pszTargetUsername = NULL;
2240	rc = VDCFGQueryStringAlloc(pImage->pInterfaceConfigCallbacks,
2241	pImage->pInterfaceConfig->pvUser,
2242	"TargetUsername",
2243	&pImage->pszTargetUsername);
2244	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
2245	rc = VINF_SUCCESS;
2246	if (RT_FAILURE(rc))
2247	{
2248	rc = iscsiError(pImage, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read TargetUsername as string"));
2249	goto out;
2250	}
2251	pImage->pbTargetSecret = NULL;
2252	pImage->cbTargetSecret = 0;
2253	rc = VDCFGQueryBytesAlloc(pImage->pInterfaceConfigCallbacks,
2254	pImage->pInterfaceConfig->pvUser,
2255	"TargetSecret", (void **)&pImage->pbTargetSecret,
2256	&pImage->cbTargetSecret);
2257	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
2258	rc = VINF_SUCCESS;
2259	if (RT_FAILURE(rc))
2260	{
2261	rc = iscsiError(pImage, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read TargetSecret as byte string"));
2262	goto out;
2263	}
2264
2265	pImage->pszHostname = NULL;
2266	pImage->uPort = 0;
2267	pImage->Socket = NIL_RTSOCKET;
2268	/* Query the iSCSI lower level configuration. */
2269	rc = VDCFGQueryU32Def(pImage->pInterfaceConfigCallbacks,
2270	pImage->pInterfaceConfig->pvUser,
2271	"Timeout", &pImage->uReadTimeout,
2272	uTimeoutDef);
2273	if (RT_FAILURE(rc))
2274	{
2275	rc = iscsiError(pImage, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read Timeout as U32"));
2276	goto out;
2277	}
2278	rc = VDCFGQueryBoolDef(pImage->pInterfaceConfigCallbacks,
2279	pImage->pInterfaceConfig->pvUser,
2280	"HostIPStack", &pImage->fHostIP,
2281	fHostIPDef);
2282	if (RT_FAILURE(rc))
2283	{
2284	rc = iscsiError(pImage, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read HostIPStack as boolean"));
2285	goto out;
2286	}
2287
2288	/* Don't actually establish iSCSI transport connection if this is just an
2289	* open to query the image information and the host IP stack isn't used.
2290	* Even trying is rather useless, as in this context the InTnet IP stack
2291	* isn't present. Returning dummies is the best possible result anyway. */
2292	if ((uOpenFlags & VD_OPEN_FLAGS_INFO) && !pImage->fHostIP)
2293	{
2294	LogFunc(("Not opening the transport connection as IntNet IP stack is not available. Will return dummies\n"));
2295	goto out;
2296	}
2297
2298	/*
2299	* Establish the iSCSI transport connection.
2300	*/
2301	rc = iscsiTransportOpen(pImage);
2302	if (RT_SUCCESS(rc))
2303	rc = iscsiAttach(pImage);
2304
2305	if (RT_FAILURE(rc))
2306	{
2307	LogRel(("iSCSI: could not open target %s, rc=%Rrc\n", pImage->pszTargetName, rc));
2308	goto out;
2309	}
2310	LogFlowFunc(("target '%s' opened successfully\n", pImage->pszTargetName));
2311
2312	SCSIREQ sr;
2313	uint8_t sense[32];
2314	uint8_t data8[8];
2315
2316	/*
2317	* Inquire available LUNs - purely dummy request.
2318	*/
2319	uint8_t cdb_rlun[12];
2320	uint8_t rlundata[16];
2321	cdb_rlun[0] = SCSI_REPORT_LUNS;
2322	cdb_rlun[1] = 0; /* reserved */
2323	cdb_rlun[2] = 0; /* reserved */
2324	cdb_rlun[3] = 0; /* reserved */
2325	cdb_rlun[4] = 0; /* reserved */
2326	cdb_rlun[5] = 0; /* reserved */
2327	cdb_rlun[6] = sizeof(rlundata) >> 24;
2328	cdb_rlun[7] = (sizeof(rlundata) >> 16) & 0xff;
2329	cdb_rlun[8] = (sizeof(rlundata) >> 8) & 0xff;
2330	cdb_rlun[9] = sizeof(rlundata) & 0xff;
2331	cdb_rlun[10] = 0; /* reserved */
2332	cdb_rlun[11] = 0; /* control */
2333
2334	sr.enmXfer = SCSIXFER_FROM_TARGET;
2335	sr.cbCmd = sizeof(cdb_rlun);
2336	sr.pvCmd = cdb_rlun;
2337	sr.cbI2TData = 0;
2338	sr.pcvI2TData = NULL;
2339	sr.cbT2IData = sizeof(rlundata);
2340	sr.pvT2IData = rlundata;
2341	sr.cbSense = sizeof(sense);
2342	sr.pvSense = sense;
2343
2344	rc = iscsiCommand(pImage, &sr);
2345	if (RT_FAILURE(rc))
2346	{
2347	LogRel(("iSCSI: Could not get LUN info for target %s, rc=%Rrc\n", pImage->pszTargetName, rc));
2348	return rc;
2349	}
2350
2351	/*
2352	* Inquire device characteristics - no tapes, scanners etc., please.
2353	*/
2354	uint8_t cdb_inq[6];
2355	cdb_inq[0] = SCSI_INQUIRY;
2356	cdb_inq[1] = 0; /* reserved */
2357	cdb_inq[2] = 0; /* reserved */
2358	cdb_inq[3] = 0; /* reserved */
2359	cdb_inq[4] = sizeof(data8);
2360	cdb_inq[5] = 0; /* control */
2361
2362	sr.enmXfer = SCSIXFER_FROM_TARGET;
2363	sr.cbCmd = sizeof(cdb_inq);
2364	sr.pvCmd = cdb_inq;
2365	sr.cbI2TData = 0;
2366	sr.pcvI2TData = NULL;
2367	sr.cbT2IData = sizeof(data8);
2368	sr.pvT2IData = data8;
2369	sr.cbSense = sizeof(sense);
2370	sr.pvSense = sense;
2371
2372	rc = iscsiCommand(pImage, &sr);
2373	if (RT_SUCCESS(rc))
2374	{
2375	if ((data8[0] & SCSI_DEVTYPE_MASK) != SCSI_DEVTYPE_DISK)
2376	{
2377	rc = iscsiError(pImage, VERR_VD_ISCSI_INVALID_TYPE,
2378	RT_SRC_POS, N_("iSCSI: target address %s, target name %s, SCSI LUN %lld reports device type=%u"),
2379	pImage->pszTargetAddress, pImage->pszTargetName,
2380	pImage->LUN, data8[0]);
2381	LogRel(("iSCSI: Unsupported SCSI peripheral device type %d for target %s\n", data8[0] & SCSI_DEVTYPE_MASK, pImage->pszTargetName));
2382	goto out;
2383	}
2384	}
2385	else
2386	{
2387	LogRel(("iSCSI: Could not get INQUIRY info for target %s, rc=%Rrc\n", pImage->pszTargetName, rc));
2388	goto out;
2389	}
2390
2391	/*
2392	* Query write disable bit in the device specific parameter entry in the
2393	* mode parameter header. Refuse read/write opening of read only disks.
2394	*/
2395
2396	uint8_t cdb_ms[6];
2397	uint8_t data4[4];
2398	cdb_ms[0] = SCSI_MODE_SENSE_6;
2399	cdb_ms[1] = 0; /* dbd=0/reserved */
2400	cdb_ms[2] = 0x3f; /* pc=0/page code=0x3f, ask for all pages */
2401	cdb_ms[3] = 0; /* subpage code=0, return everything in page_0 format */
2402	cdb_ms[4] = sizeof(data4); /* allocation length=4 */
2403	cdb_ms[5] = 0; /* control */
2404
2405	sr.enmXfer = SCSIXFER_FROM_TARGET;
2406	sr.cbCmd = sizeof(cdb_ms);
2407	sr.pvCmd = cdb_ms;
2408	sr.cbI2TData = 0;
2409	sr.pcvI2TData = NULL;
2410	sr.cbT2IData = sizeof(data4);
2411	sr.pvT2IData = data4;
2412	sr.cbSense = sizeof(sense);
2413	sr.pvSense = sense;
2414
2415	rc = iscsiCommand(pImage, &sr);
2416	if (RT_SUCCESS(rc))
2417	{
2418	if (!(uOpenFlags & VD_OPEN_FLAGS_READONLY) && data4[2] & 0x80)
2419	{
2420	rc = VERR_VD_IMAGE_READ_ONLY;
2421	goto out;
2422	}
2423	}
2424	else
2425	{
2426	LogRel(("iSCSI: Could not get MODE SENSE info for target %s, rc=%Rrc\n", pImage->pszTargetName, rc));
2427	goto out;
2428	}
2429
2430	/*
2431	* Determine sector size and capacity of the volume immediately.
2432	*/
2433	uint8_t cdb_cap[10];
2434
2435	cdb_cap[0] = SCSI_READ_CAPACITY;
2436	cdb_cap[1] = 0; /* reserved */
2437	cdb_cap[2] = 0; /* reserved */
2438	cdb_cap[3] = 0; /* reserved */
2439	cdb_cap[4] = 0; /* reserved */
2440	cdb_cap[5] = 0; /* reserved */
2441	cdb_cap[6] = 0; /* reserved */
2442	cdb_cap[7] = 0; /* reserved */
2443	cdb_cap[8] = 0; /* reserved */
2444	cdb_cap[9] = 0; /* control */
2445
2446	sr.enmXfer = SCSIXFER_FROM_TARGET;
2447	sr.cbCmd = sizeof(cdb_cap);
2448	sr.pvCmd = cdb_cap;
2449	sr.cbI2TData = 0;
2450	sr.pcvI2TData = NULL;
2451	sr.cbT2IData = sizeof(data8);
2452	sr.pvT2IData = data8;
2453	sr.cbSense = sizeof(sense);
2454	sr.pvSense = sense;
2455
2456	rc = iscsiCommand(pImage, &sr);
2457	if (RT_SUCCESS(rc))
2458	{
2459	pImage->cVolume = (data8[0] << 24) \| (data8[1] << 16) \| (data8[2] << 8) \| data8[3];
2460	pImage->cVolume++;
2461	pImage->cbSector = (data8[4] << 24) \| (data8[5] << 16) \| (data8[6] << 8) \| data8[7];
2462	pImage->cbSize = (uint64_t)(pImage->cVolume) * pImage->cbSector;
2463	if (pImage->cVolume == 0 \|\| pImage->cbSector == 0)
2464	{
2465	rc = iscsiError(pImage, VERR_VD_ISCSI_INVALID_TYPE,
2466	RT_SRC_POS, N_("iSCSI: target address %s, target name %s, SCSI LUN %lld reports media sector count=%lu sector size=%lu"),
2467	pImage->pszTargetAddress, pImage->pszTargetName,
2468	pImage->LUN, pImage->cVolume, pImage->cbSector);
2469	}
2470	}
2471	else
2472	{
2473	LogRel(("iSCSI: Could not determine capacity of target %s, rc=%Rrc\n", pImage->pszTargetName, rc));
2474	goto out;
2475	}
2476
2477	/*
2478	* Check the read and write cache bits.
2479	* Try to enable the cache if it is disabled.
2480	*
2481	* We already checked that this is a block access device. No need
2482	* to do it again.
2483	*/
2484	uint8_t aCachingModePage[32];
2485	uint8_t aCDBModeSense6[6];
2486
2487	memset(aCachingModePage, '\0', sizeof(aCachingModePage));
2488	aCDBModeSense6[0] = SCSI_MODE_SENSE_6;
2489	aCDBModeSense6[1] = 0;
2490	aCDBModeSense6[2] = (0x00 << 6) \| (0x08 & 0x3f); /* Current values and caching mode page */
2491	aCDBModeSense6[3] = 0; /* Sub page code. */
2492	aCDBModeSense6[4] = sizeof(aCachingModePage) & 0xff;
2493	aCDBModeSense6[5] = 0;
2494	sr.enmXfer = SCSIXFER_FROM_TARGET;
2495	sr.cbCmd = sizeof(aCDBModeSense6);
2496	sr.pvCmd = aCDBModeSense6;
2497	sr.cbI2TData = 0;
2498	sr.pcvI2TData = NULL;
2499	sr.cbT2IData = sizeof(aCachingModePage);
2500	sr.pvT2IData = aCachingModePage;
2501	sr.cbSense = sizeof(sense);
2502	sr.pvSense = sense;
2503	rc = iscsiCommand(pImage, &sr);
2504	if ( RT_SUCCESS(rc)
2505	&& (sr.status == SCSI_STATUS_OK)
2506	&& (aCachingModePage[0] >= 15)
2507	&& (aCachingModePage[4 + aCachingModePage[3]] & 0x3f) == 0x08
2508	&& (aCachingModePage[4 + aCachingModePage[3] + 1] > 3))
2509	{
2510	uint32_t Offset = 4 + aCachingModePage[3];
2511	/*
2512	* Check if the read and/or the write cache is disabled.
2513	* The write cache is disabled if bit 2 (WCE) is zero and
2514	* the read cache is disabled if bit 0 (RCD) is set.
2515	*/
2516	if (!ASMBitTest(&aCachingModePage[Offset + 2], 2) \|\| ASMBitTest(&aCachingModePage[Offset + 2], 0))
2517	{
2518	/*
2519	* Write Cache Enable (WCE) bit is zero or the Read Cache Disable (RCD) is one
2520	* So one of the caches is disabled. Enable both caches.
2521	* The rest is unchanged.
2522	*/
2523	ASMBitSet(&aCachingModePage[Offset + 2], 2);
2524	ASMBitClear(&aCachingModePage[Offset + 2], 0);
2525
2526	uint8_t aCDBCaching[6];
2527	aCDBCaching[0] = SCSI_MODE_SELECT_6;
2528	aCDBCaching[1] = 0; /* Don't write the page into NV RAM. */
2529	aCDBCaching[2] = 0;
2530	aCDBCaching[3] = 0;
2531	aCDBCaching[4] = sizeof(aCachingModePage) & 0xff;
2532	aCDBCaching[5] = 0;
2533	sr.enmXfer = SCSIXFER_TO_TARGET;
2534	sr.cbCmd = sizeof(aCDBCaching);
2535	sr.pvCmd = aCDBCaching;
2536	sr.cbI2TData = sizeof(aCachingModePage);
2537	sr.pcvI2TData = aCachingModePage;
2538	sr.cbT2IData = 0;
2539	sr.pvT2IData = NULL;
2540	sr.cbSense = sizeof(sense);
2541	sr.pvSense = sense;
2542	sr.status = 0;
2543	rc = iscsiCommand(pImage, &sr);
2544	if ( RT_SUCCESS(rc)
2545	&& (sr.status == SCSI_STATUS_OK))
2546	{
2547	LogRel(("iSCSI: Enabled read and write cache of target %s\n", pImage->pszTargetName));
2548	}
2549	else
2550	{
2551	/* Log failures but continue. */
2552	LogRel(("iSCSI: Could not enable read and write cache of target %s, rc=%Rrc status=%#x\n",
2553	pImage->pszTargetName, rc, sr.status));
2554	LogRel(("iSCSI: Sense:\n%.*Rhxd\n", sr.cbSense, sense));
2555	rc = VINF_SUCCESS;
2556	}
2557	}
2558	}
2559	else
2560	{
2561	/* Log errors but continue. */
2562	LogRel(("iSCSI: Could not check write cache of target %s, rc=%Rrc, got mode page %#x\n", pImage->pszTargetName, rc,aCachingModePage[0] & 0x3f));
2563	LogRel(("iSCSI: Sense:\n%.*Rhxd\n", sr.cbSense, sense));
2564	rc = VINF_SUCCESS;
2565	}
2566
2567
2568	out:
2569	if (RT_FAILURE(rc))
2570	iscsiFreeImage(pImage, false);
2571	return rc;
2572	}
2573
2574
2575	/** @copydoc VBOXHDDBACKEND::pfnCheckIfValid */
2576	static int iscsiCheckIfValid(const char *pszFilename)
2577	{
2578	LogFlowFunc(("pszFilename=\"%s\"\n", pszFilename));
2579
2580	/* iSCSI images can't be checked for validity this way, as the filename
2581	* just can't supply enough configuration information. */
2582	int rc = VERR_VD_ISCSI_INVALID_HEADER;
2583
2584	LogFlowFunc(("returns %Rrc\n", rc));
2585	return rc;
2586	}
2587
2588
2589	/** @copydoc VBOXHDDBACKEND::pfnOpen */
2590	static int iscsiOpen(const char *pszFilename, unsigned uOpenFlags,
2591	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
2592	void **ppBackendData)
2593	{
2594	LogFlowFunc(("pszFilename=\"%s\" uOpenFlags=%#x pVDIfsDisk=%#p pVDIfsImage=%#p ppBackendData=%#p\n", pszFilename, uOpenFlags, pVDIfsDisk, pVDIfsImage, ppBackendData));
2595	int rc;
2596	PISCSIIMAGE pImage;
2597
2598	/* Check open flags. All valid flags are supported. */
2599	if (uOpenFlags & ~VD_OPEN_FLAGS_MASK)
2600	{
2601	rc = VERR_INVALID_PARAMETER;
2602	goto out;
2603	}
2604
2605	/* Check remaining arguments. */
2606	if ( !VALID_PTR(pszFilename)
2607	\|\| !*pszFilename
2608	\|\| strchr(pszFilename, '"'))
2609	{
2610	rc = VERR_INVALID_PARAMETER;
2611	goto out;
2612	}
2613
2614	pImage = (PISCSIIMAGE)RTMemAllocZ(sizeof(ISCSIIMAGE));
2615	if (!pImage)
2616	{
2617	rc = VERR_NO_MEMORY;
2618	goto out;
2619	}
2620
2621	pImage->pszFilename = pszFilename;
2622	pImage->pszInitiatorName = NULL;
2623	pImage->pszTargetName = NULL;
2624	pImage->pszTargetAddress = NULL;
2625	pImage->pszInitiatorUsername = NULL;
2626	pImage->pbInitiatorSecret = NULL;
2627	pImage->pszTargetUsername = NULL;
2628	pImage->pbTargetSecret = NULL;
2629	pImage->paCurrReq = NULL;
2630	pImage->pvRecvPDUBuf = NULL;
2631	pImage->pszHostname = NULL;
2632	pImage->pVDIfsDisk = pVDIfsDisk;
2633	pImage->pVDIfsImage = pVDIfsImage;
2634
2635	rc = iscsiOpenImage(pImage, uOpenFlags);
2636	if (RT_SUCCESS(rc))
2637	*ppBackendData = pImage;
2638
2639	out:
2640	if (RT_SUCCESS(rc))
2641	{
2642	LogFlowFunc(("target %s cVolume %d, cbSector %d\n", pImage->pszTargetName, pImage->cVolume, pImage->cbSector));
2643	LogRel(("iSCSI: target address %s, target name %s, SCSI LUN %lld\n", pImage->pszTargetAddress, pImage->pszTargetName, pImage->LUN));
2644	}
2645	LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
2646	return rc;
2647	}
2648
2649
2650	/** @copydoc VBOXHDDBACKEND::pfnCreate */
2651	static int iscsiCreate(const char *pszFilename, VDIMAGETYPE enmType,
2652	uint64_t cbSize, unsigned uImageFlags,
2653	const char *pszComment,
2654	PCPDMMEDIAGEOMETRY pPCHSGeometry,
2655	PCPDMMEDIAGEOMETRY pLCHSGeometry, PCRTUUID pUuid,
2656	unsigned uOpenFlags, unsigned uPercentStart,
2657	unsigned uPercentSpan, PVDINTERFACE pVDIfsDisk,
2658	PVDINTERFACE pVDIfsImage, PVDINTERFACE pVDIfsOperation,
2659	void **ppBackendData)
2660	{
2661	LogFlowFunc(("pszFilename=\"%s\" enmType=%d cbSize=%llu uImageFlags=%#x pszComment=\"%s\" pPCHSGeometry=%#p pLCHSGeometry=%#p Uuid=%RTuuid uOpenFlags=%#x uPercentStart=%u uPercentSpan=%u pVDIfsDisk=%#p pVDIfsImage=%#p pVDIfsOperation=%#p ppBackendData=%#p", pszFilename, enmType, cbSize, uImageFlags, pszComment, pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags, uPercentStart, uPercentSpan, pVDIfsDisk, pVDIfsImage, pVDIfsOperation, ppBackendData));
2662	int rc = VERR_NOT_SUPPORTED;
2663
2664	LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
2665	return rc;
2666	}
2667
2668
2669	/** @copydoc VBOXHDDBACKEND::pfnRename */
2670	static int iscsiRename(void pBackendData, const char pszFilename)
2671	{
2672	LogFlowFunc(("pBackendData=%#p pszFilename=%#p\n", pBackendData, pszFilename));
2673	int rc = VERR_NOT_SUPPORTED;
2674
2675	LogFlowFunc(("returns %Rrc\n", rc));
2676	return rc;
2677	}
2678
2679
2680	/** @copydoc VBOXHDDBACKEND::pfnClose */
2681	static int iscsiClose(void *pBackendData, bool fDelete)
2682	{
2683	LogFlowFunc(("pBackendData=%#p fDelete=%d\n", pBackendData, fDelete));
2684	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
2685	int rc = VINF_SUCCESS;
2686
2687	Assert(!fDelete); /* This flag is unsupported. */
2688
2689	/* Freeing a never allocated image (e.g. because the open failed) is
2690	* not signalled as an error. After all nothing bad happens. */
2691	if (pImage)
2692	iscsiFreeImage(pImage, fDelete);
2693
2694	LogFlowFunc(("returns %Rrc\n", rc));
2695	return rc;
2696	}
2697
2698
2699	/** @copydoc VBOXHDDBACKEND::pfnRead */
2700	static int iscsiRead(void pBackendData, uint64_t uOffset, void pvBuf,
2701	size_t cbToRead, size_t *pcbActuallyRead)
2702	{
2703	/** @todo reinstate logging of the target everywhere - dropped temporarily */
2704	LogFlowFunc(("pBackendData=%#p uOffset=%llu pvBuf=%#p cbToRead=%zu pcbActuallyRead=%#p\n", pBackendData, uOffset, pvBuf, cbToRead, pcbActuallyRead));
2705	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
2706	uint64_t lba;
2707	size_t tls;
2708	int rc;
2709
2710	Assert(pImage);
2711	Assert(uOffset % 512 == 0);
2712	Assert(cbToRead % 512 == 0);
2713
2714	Assert(pImage->cbSector);
2715	AssertPtr(pvBuf);
2716
2717	if ( uOffset + cbToRead > pImage->cbSize
2718	\|\| cbToRead == 0)
2719	{
2720	rc = VERR_INVALID_PARAMETER;
2721	goto out;
2722	}
2723
2724	lba = uOffset / pImage->cbSector;
2725	tls = cbToRead / pImage->cbSector;
2726	SCSIREQ sr;
2727	uint8_t cdb[10];
2728	uint8_t sense[32];
2729
2730	cdb[0] = SCSI_READ_10;
2731	cdb[1] = 0; /* reserved */
2732	cdb[2] = (lba >> 24) & 0xff;
2733	cdb[3] = (lba >> 16) & 0xff;
2734	cdb[4] = (lba >> 8) & 0xff;
2735	cdb[5] = lba & 0xff;
2736	cdb[6] = 0; /* reserved */
2737	cdb[7] = (tls >> 8) & 0xff;
2738	cdb[8] = tls & 0xff;
2739	cdb[9] = 0; /* control */
2740
2741	sr.enmXfer = SCSIXFER_FROM_TARGET;
2742	sr.cbCmd = sizeof(cdb);
2743	sr.pvCmd = cdb;
2744	sr.cbI2TData = 0;
2745	sr.pcvI2TData = NULL;
2746	sr.cbT2IData = cbToRead;
2747	sr.pvT2IData = pvBuf;
2748	sr.cbSense = sizeof(sense);
2749	sr.pvSense = sense;
2750
2751	rc = iscsiCommand(pImage, &sr);
2752	if (RT_FAILURE(rc))
2753	AssertMsgFailed(("iscsiCommand(%s, %#llx) -> %Rrc\n", pImage->pszTargetName, uOffset, rc));
2754
2755	out:
2756	LogFlowFunc(("returns %Rrc\n", rc));
2757	return rc;
2758	}
2759
2760
2761	/** @copydoc VBOXHDDBACKEND::pfnWrite */
2762	static int iscsiWrite(void pBackendData, uint64_t uOffset, const void pvBuf,
2763	size_t cbToWrite, size_t *pcbWriteProcess,
2764	size_t pcbPreRead, size_t pcbPostRead, unsigned fWrite)
2765	{
2766	LogFlowFunc(("pBackendData=%#p uOffset=%llu pvBuf=%#p cbToWrite=%zu pcbWriteProcess=%#p pcbPreRead=%#p pcbPostRead=%#p\n", pBackendData, uOffset, pvBuf, cbToWrite, pcbWriteProcess, pcbPreRead, pcbPostRead));
2767	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
2768	uint64_t lba;
2769	size_t tls;
2770	int rc;
2771
2772	Assert(pImage);
2773	Assert(uOffset % 512 == 0);
2774	Assert(cbToWrite % 512 == 0);
2775
2776	Assert(pImage->cbSector);
2777	Assert(pvBuf);
2778
2779	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2780	{
2781	rc = VERR_VD_IMAGE_READ_ONLY;
2782	goto out;
2783	}
2784
2785	*pcbPreRead = 0;
2786	*pcbPostRead = 0;
2787
2788	lba = uOffset / pImage->cbSector;
2789	tls = cbToWrite / pImage->cbSector;
2790	SCSIREQ sr;
2791	uint8_t cdb[10];
2792	uint8_t sense[32];
2793
2794	cdb[0] = SCSI_WRITE_10;
2795	cdb[1] = 0; /* reserved */
2796	cdb[2] = (lba >> 24) & 0xff;
2797	cdb[3] = (lba >> 16) & 0xff;
2798	cdb[4] = (lba >> 8) & 0xff;
2799	cdb[5] = lba & 0xff;
2800	cdb[6] = 0; /* reserved */
2801	cdb[7] = (tls >> 8) & 0xff;
2802	cdb[8] = tls & 0xff;
2803	cdb[9] = 0; /* control */
2804
2805	sr.enmXfer = SCSIXFER_TO_TARGET;
2806	sr.cbCmd = sizeof(cdb);
2807	sr.pvCmd = cdb;
2808	sr.cbI2TData = cbToWrite;
2809	sr.pcvI2TData = pvBuf;
2810	sr.cbT2IData = 0;
2811	sr.pvT2IData = NULL;
2812	sr.cbSense = sizeof(sense);
2813	sr.pvSense = sense;
2814
2815	rc = iscsiCommand(pImage, &sr);
2816	if (RT_FAILURE(rc))
2817	{
2818	AssertMsgFailed(("iscsiCommand(%s, %#llx) -> %Rrc\n", pImage->pszTargetName, uOffset, rc));
2819	*pcbWriteProcess = 0;
2820	}
2821	else
2822	*pcbWriteProcess = cbToWrite;
2823
2824	out:
2825	LogFlowFunc(("returns %Rrc\n", rc));
2826	return rc;
2827	}
2828
2829
2830	/** @copydoc VBOXHDDBACKEND::pfnFlush */
2831	static int iscsiFlush(void *pBackendData)
2832	{
2833	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
2834	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
2835	int rc;
2836
2837	Assert(pImage);
2838
2839	SCSIREQ sr;
2840	uint8_t cdb[10];
2841	uint8_t sense[32];
2842
2843	cdb[0] = SCSI_SYNCHRONIZE_CACHE;
2844	cdb[1] = 0; /* reserved */
2845	cdb[2] = 0; /* LBA 0 */
2846	cdb[3] = 0; /* LBA 0 */
2847	cdb[4] = 0; /* LBA 0 */
2848	cdb[5] = 0; /* LBA 0 */
2849	cdb[6] = 0; /* reserved */
2850	cdb[7] = 0; /* transfer everything to disk */
2851	cdb[8] = 0; /* transfer everything to disk */
2852	cdb[9] = 0; /* control */
2853
2854	sr.enmXfer = SCSIXFER_TO_TARGET;
2855	sr.cbCmd = sizeof(cdb);
2856	sr.pvCmd = cdb;
2857	sr.cbI2TData = 0;
2858	sr.pcvI2TData = NULL;
2859	sr.cbT2IData = 0;
2860	sr.pvT2IData = NULL;
2861	sr.cbSense = sizeof(sense);
2862	sr.pvSense = sense;
2863
2864	rc = iscsiCommand(pImage, &sr);
2865	if (RT_FAILURE(rc))
2866	AssertMsgFailed(("iscsiCommand(%s) -> %Rrc\n", pImage->pszTargetName, rc));
2867	LogFlowFunc(("returns %Rrc\n", rc));
2868	return rc;
2869	}
2870
2871
2872	/** @copydoc VBOXHDDBACKEND::pfnGetVersion */
2873	static unsigned iscsiGetVersion(void *pBackendData)
2874	{
2875	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
2876	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
2877
2878	Assert(pImage);
2879	NOREF(pImage);
2880
2881	return 0;
2882	}
2883
2884
2885	/** @copydoc VBOXHDDBACKEND::pfnGetImageType */
2886	static int iscsiGetImageType(void *pBackendData, PVDIMAGETYPE penmImageType)
2887	{
2888	LogFlowFunc(("pBackendData=%#p penmImageType=%#p\n", pBackendData, penmImageType));
2889	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
2890	int rc = VINF_SUCCESS;
2891
2892	Assert(pImage);
2893	Assert(penmImageType);
2894
2895	if (pImage)
2896	*penmImageType = VD_IMAGE_TYPE_FIXED;
2897	else
2898	rc = VERR_VD_NOT_OPENED;
2899
2900	LogFlowFunc(("returns %Rrc enmImageType=%u\n", rc, *penmImageType));
2901	return rc;
2902	}
2903
2904
2905	/** @copydoc VBOXHDDBACKEND::pfnGetSize */
2906	static uint64_t iscsiGetSize(void *pBackendData)
2907	{
2908	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
2909	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
2910
2911	Assert(pImage);
2912
2913	if (pImage)
2914	return pImage->cbSize;
2915	else
2916	return 0;
2917	}
2918
2919
2920	/** @copydoc VBOXHDDBACKEND::pfnGetFileSize */
2921	static uint64_t iscsiGetFileSize(void *pBackendData)
2922	{
2923	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
2924	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
2925
2926	Assert(pImage);
2927	NOREF(pImage);
2928
2929	if (pImage)
2930	return pImage->cbSize;
2931	else
2932	return 0;
2933	}
2934
2935
2936	/** @copydoc VBOXHDDBACKEND::pfnGetPCHSGeometry */
2937	static int iscsiGetPCHSGeometry(void *pBackendData,
2938	PPDMMEDIAGEOMETRY pPCHSGeometry)
2939	{
2940	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p\n", pBackendData, pPCHSGeometry));
2941	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
2942	int rc;
2943
2944	Assert(pImage);
2945
2946	if (pImage)
2947	rc = VERR_VD_GEOMETRY_NOT_SET;
2948	else
2949	rc = VERR_VD_NOT_OPENED;
2950
2951	LogFlowFunc(("returns %Rrc (PCHS=%u/%u/%u)\n", rc, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
2952	return rc;
2953	}
2954
2955
2956	/** @copydoc VBOXHDDBACKEND::pfnSetPCHSGeometry */
2957	static int iscsiSetPCHSGeometry(void *pBackendData,
2958	PCPDMMEDIAGEOMETRY pPCHSGeometry)
2959	{
2960	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p PCHS=%u/%u/%u\n", pBackendData, pPCHSGeometry, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
2961	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
2962	int rc;
2963
2964	Assert(pImage);
2965
2966	if (pImage)
2967	{
2968	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2969	{
2970	rc = VERR_VD_IMAGE_READ_ONLY;
2971	goto out;
2972	}
2973	rc = VERR_VD_GEOMETRY_NOT_SET;
2974	}
2975	else
2976	rc = VERR_VD_NOT_OPENED;
2977
2978	out:
2979	LogFlowFunc(("returns %Rrc\n", rc));
2980	return rc;
2981	}
2982
2983
2984	/** @copydoc VBOXHDDBACKEND::pfnGetLCHSGeometry */
2985	static int iscsiGetLCHSGeometry(void *pBackendData,
2986	PPDMMEDIAGEOMETRY pLCHSGeometry)
2987	{
2988	LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p\n", pBackendData, pLCHSGeometry));
2989	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
2990	int rc;
2991
2992	Assert(pImage);
2993
2994	if (pImage)
2995	rc = VERR_VD_GEOMETRY_NOT_SET;
2996	else
2997	rc = VERR_VD_NOT_OPENED;
2998
2999	LogFlowFunc(("returns %Rrc (LCHS=%u/%u/%u)\n", rc, pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
3000	return rc;
3001	}
3002
3003
3004	/** @copydoc VBOXHDDBACKEND::pfnGetImageFlags */
3005	static unsigned iscsiGetImageFlags(void *pBackendData)
3006	{
3007	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
3008	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
3009	unsigned uImageFlags;
3010
3011	Assert(pImage);
3012	NOREF(pImage);
3013
3014	uImageFlags = VD_IMAGE_FLAGS_NONE;
3015
3016	LogFlowFunc(("returns %#x\n", uImageFlags));
3017	return uImageFlags;
3018	}
3019
3020
3021	/** @copydoc VBOXHDDBACKEND::pfnGetOpenFlags */
3022	static unsigned iscsiGetOpenFlags(void *pBackendData)
3023	{
3024	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
3025	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
3026	unsigned uOpenFlags;
3027
3028	Assert(pImage);
3029
3030	if (pImage)
3031	uOpenFlags = pImage->uOpenFlags;
3032	else
3033	uOpenFlags = 0;
3034
3035	LogFlowFunc(("returns %#x\n", uOpenFlags));
3036	return uOpenFlags;
3037	}
3038
3039
3040	/** @copydoc VBOXHDDBACKEND::pfnSetOpenFlags */
3041	static int iscsiSetOpenFlags(void *pBackendData, unsigned uOpenFlags)
3042	{
3043	LogFlowFunc(("pBackendData=%#p\n uOpenFlags=%#x", pBackendData, uOpenFlags));
3044	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
3045	int rc;
3046
3047	/* Image must be opened and the new flags must be valid. Just readonly and
3048	* info flags are supported. */
3049	if (!pImage \|\| (uOpenFlags & ~(VD_OPEN_FLAGS_READONLY \| VD_OPEN_FLAGS_INFO)))
3050	{
3051	rc = VERR_INVALID_PARAMETER;
3052	goto out;
3053	}
3054
3055	/* Implement this operation via reopening the image. */
3056	iscsiFreeImage(pImage, false);
3057	rc = iscsiOpenImage(pImage, uOpenFlags);
3058
3059	out:
3060	LogFlowFunc(("returns %Rrc\n", rc));
3061	return rc;
3062	}
3063
3064
3065	/** @copydoc VBOXHDDBACKEND::pfnSetLCHSGeometry */
3066	static int iscsiSetLCHSGeometry(void *pBackendData,
3067	PCPDMMEDIAGEOMETRY pLCHSGeometry)
3068	{
3069	LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p LCHS=%u/%u/%u\n", pBackendData, pLCHSGeometry, pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
3070	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
3071	int rc;
3072
3073	Assert(pImage);
3074
3075	if (pImage)
3076	{
3077	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
3078	{
3079	rc = VERR_VD_IMAGE_READ_ONLY;
3080	goto out;
3081	}
3082	rc = VERR_VD_GEOMETRY_NOT_SET;
3083	}
3084	else
3085	rc = VERR_VD_NOT_OPENED;
3086
3087	out:
3088	LogFlowFunc(("returns %Rrc\n", rc));
3089	return rc;
3090	}
3091
3092
3093	/** @copydoc VBOXHDDBACKEND::pfnGetComment */
3094	static int iscsiGetComment(void pBackendData, char pszComment,
3095	size_t cbComment)
3096	{
3097	LogFlowFunc(("pBackendData=%#p pszComment=%#p cbComment=%zu\n", pBackendData, pszComment, cbComment));
3098	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
3099	int rc;
3100
3101	Assert(pImage);
3102
3103	if (pImage)
3104	rc = VERR_NOT_SUPPORTED;
3105	else
3106	rc = VERR_VD_NOT_OPENED;
3107
3108	LogFlowFunc(("returns %Rrc comment='%s'\n", rc, pszComment));
3109	return rc;
3110	}
3111
3112
3113	/** @copydoc VBOXHDDBACKEND::pfnSetComment */
3114	static int iscsiSetComment(void pBackendData, const char pszComment)
3115	{
3116	LogFlowFunc(("pBackendData=%#p pszComment=\"%s\"\n", pBackendData, pszComment));
3117	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
3118	int rc;
3119
3120	Assert(pImage);
3121
3122	if (pImage)
3123	{
3124	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
3125	rc = VERR_NOT_SUPPORTED;
3126	else
3127	rc = VERR_VD_IMAGE_READ_ONLY;
3128	}
3129	else
3130	rc = VERR_VD_NOT_OPENED;
3131
3132	LogFlowFunc(("returns %Rrc\n", rc));
3133	return rc;
3134	}
3135
3136
3137	/** @copydoc VBOXHDDBACKEND::pfnGetUuid */
3138	static int iscsiGetUuid(void *pBackendData, PRTUUID pUuid)
3139	{
3140	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
3141	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
3142	int rc;
3143
3144	Assert(pImage);
3145
3146	if (pImage)
3147	rc = VERR_NOT_SUPPORTED;
3148	else
3149	rc = VERR_VD_NOT_OPENED;
3150
3151	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
3152	return rc;
3153	}
3154
3155
3156	/** @copydoc VBOXHDDBACKEND::pfnSetUuid */
3157	static int iscsiSetUuid(void *pBackendData, PCRTUUID pUuid)
3158	{
3159	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
3160	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
3161	int rc;
3162
3163	LogFlowFunc(("%RTuuid\n", pUuid));
3164	Assert(pImage);
3165
3166	if (pImage)
3167	{
3168	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
3169	rc = VERR_NOT_SUPPORTED;
3170	else
3171	rc = VERR_VD_IMAGE_READ_ONLY;
3172	}
3173	else
3174	rc = VERR_VD_NOT_OPENED;
3175
3176	LogFlowFunc(("returns %Rrc\n", rc));
3177	return rc;
3178	}
3179
3180
3181	/** @copydoc VBOXHDDBACKEND::pfnGetModificationUuid */
3182	static int iscsiGetModificationUuid(void *pBackendData, PRTUUID pUuid)
3183	{
3184	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
3185	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
3186	int rc;
3187
3188	Assert(pImage);
3189
3190	if (pImage)
3191	rc = VERR_NOT_SUPPORTED;
3192	else
3193	rc = VERR_VD_NOT_OPENED;
3194
3195	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
3196	return rc;
3197	}
3198
3199
3200	/** @copydoc VBOXHDDBACKEND::pfnSetModificationUuid */
3201	static int iscsiSetModificationUuid(void *pBackendData, PCRTUUID pUuid)
3202	{
3203	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
3204	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
3205	int rc;
3206
3207	LogFlowFunc(("%RTuuid\n", pUuid));
3208	Assert(pImage);
3209
3210	if (pImage)
3211	{
3212	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
3213	rc = VERR_NOT_SUPPORTED;
3214	else
3215	rc = VERR_VD_IMAGE_READ_ONLY;
3216	}
3217	else
3218	rc = VERR_VD_NOT_OPENED;
3219
3220	LogFlowFunc(("returns %Rrc\n", rc));
3221	return rc;
3222	}
3223
3224
3225	/** @copydoc VBOXHDDBACKEND::pfnGetParentUuid */
3226	static int iscsiGetParentUuid(void *pBackendData, PRTUUID pUuid)
3227	{
3228	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
3229	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
3230	int rc;
3231
3232	Assert(pImage);
3233
3234	if (pImage)
3235	rc = VERR_NOT_SUPPORTED;
3236	else
3237	rc = VERR_VD_NOT_OPENED;
3238
3239	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
3240	return rc;
3241	}
3242
3243
3244	/** @copydoc VBOXHDDBACKEND::pfnSetParentUuid */
3245	static int iscsiSetParentUuid(void *pBackendData, PCRTUUID pUuid)
3246	{
3247	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
3248	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
3249	int rc;
3250
3251	LogFlowFunc(("%RTuuid\n", pUuid));
3252	Assert(pImage);
3253
3254	if (pImage)
3255	{
3256	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
3257	rc = VERR_NOT_SUPPORTED;
3258	else
3259	rc = VERR_VD_IMAGE_READ_ONLY;
3260	}
3261	else
3262	rc = VERR_VD_NOT_OPENED;
3263
3264	LogFlowFunc(("returns %Rrc\n", rc));
3265	return rc;
3266	}
3267
3268
3269	/** @copydoc VBOXHDDBACKEND::pfnGetParentModificationUuid */
3270	static int iscsiGetParentModificationUuid(void *pBackendData, PRTUUID pUuid)
3271	{
3272	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
3273	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
3274	int rc;
3275
3276	Assert(pImage);
3277
3278	if (pImage)
3279	rc = VERR_NOT_SUPPORTED;
3280	else
3281	rc = VERR_VD_NOT_OPENED;
3282
3283	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
3284	return rc;
3285	}
3286
3287
3288	/** @copydoc VBOXHDDBACKEND::pfnSetParentModificationUuid */
3289	static int iscsiSetParentModificationUuid(void *pBackendData, PCRTUUID pUuid)
3290	{
3291	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
3292	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
3293	int rc;
3294
3295	LogFlowFunc(("%RTuuid\n", pUuid));
3296	Assert(pImage);
3297
3298	if (pImage)
3299	{
3300	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
3301	rc = VERR_NOT_SUPPORTED;
3302	else
3303	rc = VERR_VD_IMAGE_READ_ONLY;
3304	}
3305	else
3306	rc = VERR_VD_NOT_OPENED;
3307
3308	LogFlowFunc(("returns %Rrc\n", rc));
3309	return rc;
3310	}
3311
3312
3313	/** @copydoc VBOXHDDBACKEND::pfnDump */
3314	static void iscsiDump(void *pBackendData)
3315	{
3316	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
3317
3318	Assert(pImage);
3319	if (pImage)
3320	{
3321	/** @todo put something useful here */
3322	RTLogPrintf("Header: cVolume=%u\n", pImage->cVolume);
3323	}
3324	}
3325
3326
3327	/** @copydoc VBOXHDDBACKEND::pfnGetTimeStamp */
3328	static int iscsiGetTimeStamp(void *pBackendData, PRTTIMESPEC pTimeStamp)
3329	{
3330	LogFlowFunc(("pBackendData=%#p pTimeStamp=%#p\n", pBackendData, pTimeStamp));
3331	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
3332	int rc = VERR_NOT_SUPPORTED;
3333
3334	Assert(pImage);
3335	NOREF(pImage);
3336
3337	LogFlowFunc(("returns %Rrc\n", rc));
3338	return rc;
3339	}
3340
3341
3342	/** @copydoc VBOXHDDBACKEND::pfnGetParentTimeStamp */
3343	static int iscsiGetParentTimeStamp(void *pBackendData, PRTTIMESPEC pTimeStamp)
3344	{
3345	LogFlowFunc(("pBackendData=%#p pTimeStamp=%#p\n", pBackendData, pTimeStamp));
3346	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
3347	int rc = VERR_NOT_SUPPORTED;
3348
3349	Assert(pImage);
3350	NOREF(pImage);
3351
3352	LogFlowFunc(("returns %Rrc\n", rc));
3353	return rc;
3354	}
3355
3356
3357	/** @copydoc VBOXHDDBACKEND::pfnSetParentTimeStamp */
3358	static int iscsiSetParentTimeStamp(void *pBackendData, PCRTTIMESPEC pTimeStamp)
3359	{
3360	LogFlowFunc(("pBackendData=%#p pTimeStamp=%#p\n", pBackendData, pTimeStamp));
3361	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
3362	int rc = VERR_NOT_SUPPORTED;
3363
3364	Assert(pImage);
3365	NOREF(pImage);
3366
3367	LogFlowFunc(("returns %Rrc\n", rc));
3368	return rc;
3369	}
3370
3371
3372	/** @copydoc VBOXHDDBACKEND::pfnGetParentFilename */
3373	static int iscsiGetParentFilename(void pBackendData, char *ppszParentFilename)
3374	{
3375	LogFlowFunc(("pBackendData=%#p ppszParentFilename=%#p\n", pBackendData, ppszParentFilename));
3376	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
3377	int rc = VERR_NOT_SUPPORTED;
3378
3379	Assert(pImage);
3380	NOREF(pImage);
3381
3382	LogFlowFunc(("returns %Rrc\n", rc));
3383	return rc;
3384	}
3385
3386
3387	/** @copydoc VBOXHDDBACKEND::pfnSetParentFilename */
3388	static int iscsiSetParentFilename(void pBackendData, const char pszParentFilename)
3389	{
3390	LogFlowFunc(("pBackendData=%#p pszParentFilename=%s\n", pBackendData, pszParentFilename));
3391	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
3392	int rc = VERR_NOT_SUPPORTED;
3393
3394	Assert(pImage);
3395	NOREF(pImage);
3396
3397	LogFlowFunc(("returns %Rrc\n", rc));
3398	return rc;
3399	}
3400
3401	/** @copydoc VBOXHDDBACKEND::pfnComposeLocation */
3402	static int iscsiComposeLocation(PVDINTERFACE pConfig, char **pszLocation)
3403	{
3404	char *pszTarget = NULL;
3405	char *pszLUN = NULL;
3406	char *pszAddress = NULL;
3407	int rc = VDCFGQueryStringAlloc(VDGetInterfaceConfig(pConfig), pConfig->pvUser, "TargetName", &pszTarget);
3408	if (RT_SUCCESS(rc))
3409	{
3410	rc = VDCFGQueryStringAlloc(VDGetInterfaceConfig(pConfig), pConfig->pvUser, "LUN", &pszLUN);
3411	if (RT_SUCCESS(rc))
3412	{
3413	rc = VDCFGQueryStringAlloc(VDGetInterfaceConfig(pConfig), pConfig->pvUser, "TargetAddress", &pszAddress);
3414	if (RT_SUCCESS(rc))
3415	{
3416	if (RTStrAPrintf(pszLocation, "iscsi://%s/%s/%s",
3417	pszAddress, pszTarget, pszLUN) < 0)
3418	rc = VERR_NO_MEMORY;
3419	}
3420	}
3421	}
3422	RTMemFree(pszTarget);
3423	RTMemFree(pszLUN);
3424	RTMemFree(pszAddress);
3425	return rc;
3426	}
3427
3428	/** @copydoc VBOXHDDBACKEND::pfnComposeName */
3429	static int iscsiComposeName(PVDINTERFACE pConfig, char **pszName)
3430	{
3431	char *pszTarget = NULL;
3432	char *pszLUN = NULL;
3433	char *pszAddress = NULL;
3434	int rc = VDCFGQueryStringAlloc(VDGetInterfaceConfig(pConfig), pConfig->pvUser, "TargetName", &pszTarget);
3435	if (RT_SUCCESS(rc))
3436	{
3437	rc = VDCFGQueryStringAlloc(VDGetInterfaceConfig(pConfig), pConfig->pvUser, "LUN", &pszLUN);
3438	if (RT_SUCCESS(rc))
3439	{
3440	rc = VDCFGQueryStringAlloc(VDGetInterfaceConfig(pConfig), pConfig->pvUser, "TargetAddress", &pszAddress);
3441	if (RT_SUCCESS(rc))
3442	{
3443	/** @todo think about a nicer looking location scheme for iSCSI */
3444	if (RTStrAPrintf(pszName, "%s/%s/%s",
3445	pszAddress, pszTarget, pszLUN) < 0)
3446	rc = VERR_NO_MEMORY;
3447	}
3448	}
3449	}
3450	RTMemFree(pszTarget);
3451	RTMemFree(pszLUN);
3452	RTMemFree(pszAddress);
3453
3454	return rc;
3455	}
3456
3457
3458	VBOXHDDBACKEND g_ISCSIBackend =
3459	{
3460	/* pszBackendName */
3461	"iSCSI",
3462	/* cbSize */
3463	sizeof(VBOXHDDBACKEND),
3464	/* uBackendCaps */
3465	VD_CAP_CONFIG \| VD_CAP_TCPNET,
3466	/* papszFileExtensions */
3467	NULL,
3468	/* paConfigInfo */
3469	s_iscsiConfigInfo,
3470	/* hPlugin */
3471	NIL_RTLDRMOD,
3472	/* pfnCheckIfValid */
3473	iscsiCheckIfValid,
3474	/* pfnOpen */
3475	iscsiOpen,
3476	/* pfnCreate */
3477	iscsiCreate,
3478	/* pfnRename */
3479	iscsiRename,
3480	/* pfnClose */
3481	iscsiClose,
3482	/* pfnRead */
3483	iscsiRead,
3484	/* pfnWrite */
3485	iscsiWrite,
3486	/* pfnFlush */
3487	iscsiFlush,
3488	/* pfnGetVersion */
3489	iscsiGetVersion,
3490	/* pfnGetImageType */
3491	iscsiGetImageType,
3492	/* pfnGetSize */
3493	iscsiGetSize,
3494	/* pfnGetFileSize */
3495	iscsiGetFileSize,
3496	/* pfnGetPCHSGeometry */
3497	iscsiGetPCHSGeometry,
3498	/* pfnSetPCHSGeometry */
3499	iscsiSetPCHSGeometry,
3500	/* pfnGetLCHSGeometry */
3501	iscsiGetLCHSGeometry,
3502	/* pfnSetLCHSGeometry */
3503	iscsiSetLCHSGeometry,
3504	/* pfnGetImageFlags */
3505	iscsiGetImageFlags,
3506	/* pfnGetOpenFlags */
3507	iscsiGetOpenFlags,
3508	/* pfnSetOpenFlags */
3509	iscsiSetOpenFlags,
3510	/* pfnGetComment */
3511	iscsiGetComment,
3512	/* pfnSetComment */
3513	iscsiSetComment,
3514	/* pfnGetUuid */
3515	iscsiGetUuid,
3516	/* pfnSetUuid */
3517	iscsiSetUuid,
3518	/* pfnGetModificationUuid */
3519	iscsiGetModificationUuid,
3520	/* pfnSetModificationUuid */
3521	iscsiSetModificationUuid,
3522	/* pfnGetParentUuid */
3523	iscsiGetParentUuid,
3524	/* pfnSetParentUuid */
3525	iscsiSetParentUuid,
3526	/* pfnGetParentModificationUuid */
3527	iscsiGetParentModificationUuid,
3528	/* pfnSetParentModificationUuid */
3529	iscsiSetParentModificationUuid,
3530	/* pfnDump */
3531	iscsiDump,
3532	/* pfnGetTimeStamp */
3533	iscsiGetTimeStamp,
3534	/* pfnGetParentTimeStamp */
3535	iscsiGetParentTimeStamp,
3536	/* pfnSetParentTimeStamp */
3537	iscsiSetParentTimeStamp,
3538	/* pfnGetParentFilename */
3539	iscsiGetParentFilename,
3540	/* pfnSetParentFilename */
3541	iscsiSetParentFilename,
3542	/* pfnIsAsyncIOSupported */
3543	NULL,
3544	/* pfnAsyncRead */
3545	NULL,
3546	/* pfnAsyncWrite */
3547	NULL,
3548	/* pfnComposeLocation */
3549	iscsiComposeLocation,
3550	/* pfnComposeName */
3551	iscsiComposeName
3552	};

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source: vbox/trunk/src/VBox/Devices/Storage/ISCSIHDDCore.cpp@ 17828

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