DBGCIo.cpp@ 96014

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1	/* $Id: DBGCIo.cpp 93115 2022-01-01 11:31:46Z vboxsync $ */
2	/** @file
3	* DBGC - Debugger Console, I/O provider handling.
4	*/
5
6	/*
7	* Copyright (C) 2020-2022 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18
19	/*********************************************************************************************************************************
20	* Header Files *
21	*********************************************************************************************************************************/
22	#include <VBox/dbg.h>
23	#include <VBox/vmm/cfgm.h>
24	#include <VBox/err.h>
25
26	#include <iprt/mem.h>
27	#include <iprt/thread.h>
28	#include <VBox/log.h>
29	#include <iprt/assert.h>
30
31	#include <iprt/string.h>
32
33	#include "DBGCIoProvInternal.h"
34	#include "DBGCInternal.h"
35
36
37	/*********************************************************************************************************************************
38	* Structures and Typedefs *
39	*********************************************************************************************************************************/
40
41	/**
42	* Stub descriptor.
43	*/
44	typedef struct DBGCSTUB
45	{
46	/** Name of the stub. */
47	const char *pszName;
48	/** Flag whether this is an ASCII based protocol which requires some newline handling. */
49	bool fAscii;
50	/**
51	* The runloop callback.
52	*
53	* @returns VBox status code.
54	* @param pUVM The user mode VM handle.
55	* @param pIo Pointer to the I/O callback table.
56	* @param fFlags Flags for the runloop, MBZ for now.
57	*/
58	DECLCALLBACKMEMBER(int, pfnRunloop, (PUVM pUVM, PCDBGCIO pIo, unsigned fFlags));
59	} DBGCSTUB;
60	/** Pointer to a stub descriptor. */
61	typedef DBGCSTUB *PDBGCSTUB;
62	/** Pointer to a const stub descriptor. */
63	typedef const DBGCSTUB *PCDBGCSTUB;
64
65
66	/** Pointer to the instance data of the debug console I/O. */
67	typedef struct DBGCIOINT *PDBGCIOINT;
68
69
70	/**
71	* A single debug console I/O service.
72	*/
73	typedef struct DBGCIOSVC
74	{
75	/** Pointer to the owning structure. */
76	PDBGCIOINT pDbgcIo;
77	/** The user mode VM handle this service belongs to. */
78	PUVM pUVM;
79	/** The I/O provider registration record for this service. */
80	PCDBGCIOPROVREG pIoProvReg;
81	/** The I/O provider instance. */
82	DBGCIOPROV hDbgcIoProv;
83	/** The stub type. */
84	PCDBGCSTUB pStub;
85	/** The thread managing the service. */
86	RTTHREAD hThreadSvc;
87	/** Pointer to the I/O callback table currently being served. */
88	PCDBGCIO pIo;
89	/** The wrapping DBGC I/O callback table for ASCII based protocols. */
90	DBGCIO IoAscii;
91	} DBGCIOSVC;
92	/** Pointer to a single debug console I/O service. */
93	typedef DBGCIOSVC *PDBGCIOSVC;
94	/** Poitner to a const single debug console I/O service. */
95	typedef const DBGCIOSVC *PCDBGCIOSVC;
96
97
98	/**
99	* Debug console I/O instance data.
100	*/
101	typedef struct DBGCIOINT
102	{
103	/** Number of configured I/O service instances. */
104	volatile uint32_t cSvcsCfg;
105	/** Number of running I/O service instances. */
106	volatile uint32_t cSvcsRunning;
107	/** Flag whether the services were asked to shut down. */
108	volatile bool fShutdown;
109	/** Array of active I/O service instances. */
110	RT_FLEXIBLE_ARRAY_EXTENSION
111	DBGCIOSVC aSvc[RT_FLEXIBLE_ARRAY];
112	} DBGCIOINT;
113
114
115	/*********************************************************************************************************************************
116	* Global Variables *
117	*********************************************************************************************************************************/
118
119	/**
120	* Array of supported I/O providers.
121	*/
122	static PCDBGCIOPROVREG g_aIoProv[] =
123	{
124	&g_DbgcIoProvTcp,
125	&g_DbgcIoProvIpc
126	};
127
128
129	static DECLCALLBACK(int) dbgcIoNativeStubRunloop(PUVM pUVM, PCDBGCIO pIo, unsigned fFlags);
130
131	/**
132	* Array of supported stubs.
133	*/
134	static const DBGCSTUB g_aStubs[] =
135	{
136	/** pszName fAscii pfnRunloop */
137	{ "Native", true, dbgcIoNativeStubRunloop },
138	{ "Gdb", false, dbgcGdbStubRunloop },
139	{ "Kd", false, dbgcKdStubRunloop }
140	};
141
142
143	/*********************************************************************************************************************************
144	* Internal Functions *
145	*********************************************************************************************************************************/
146
147
148	/**
149	* Destroys all allocated data for the given dbeugger console I/O instance.
150	*
151	* @returns nothing.
152	* @param pDbgcIo Pointer to the dbeugger console I/O instance data.
153	*/
154	static void dbgcIoDestroy(PDBGCIOINT pDbgcIo)
155	{
156	for (uint32_t i = 0; i < pDbgcIo->cSvcsCfg; i++)
157	{
158	PDBGCIOSVC pIoSvc = &pDbgcIo->aSvc[i];
159
160	if (pIoSvc->hThreadSvc != NIL_RTTHREAD)
161	{
162	int rc = RTThreadWait(pIoSvc->hThreadSvc, RT_MS_10SEC, NULL /prc/);
163	AssertRC(rc);
164
165	pIoSvc->hThreadSvc = NIL_RTTHREAD;
166	pIoSvc->pIoProvReg->pfnDestroy(pIoSvc->hDbgcIoProv);
167	}
168	}
169
170	RTMemFree(pDbgcIo);
171	}
172
173
174	/**
175	* Returns the number of I/O services configured.
176	*
177	* @returns I/O service count.
178	* @param pCfgRoot The root of the config.
179	*/
180	static uint32_t dbgcIoGetSvcCount(PCFGMNODE pCfgRoot)
181	{
182	uint32_t cSvcs = 0;
183	PCFGMNODE pNd = CFGMR3GetFirstChild(pCfgRoot);
184	while (pNd)
185	{
186	cSvcs++;
187	pNd = CFGMR3GetNextChild(pNd);
188	}
189
190	return cSvcs;
191	}
192
193
194	/**
195	* Returns a pointer to the I/O provider registration record matching the given name.
196	*
197	* @returns Pointer to the registration record or NULL if not found.
198	* @param pszName The name to look for (case insensitive matching).
199	*/
200	static PCDBGCIOPROVREG dbgcIoProvFindRegByName(const char *pszName)
201	{
202	for (uint32_t i = 0; i < RT_ELEMENTS(g_aIoProv); i++)
203	{
204	if (!RTStrICmp(g_aIoProv[i]->pszName, pszName))
205	return g_aIoProv[i];
206	}
207	return NULL;
208	}
209
210
211	/**
212	* Returns a pointer to the stub record matching the given name.
213	*
214	* @returns Pointer to the stub record or NULL if not found.
215	* @param pszName The name to look for (case insensitive matching).
216	*/
217	static PCDBGCSTUB dbgcIoFindStubByName(const char *pszName)
218	{
219	for (uint32_t i = 0; i < RT_ELEMENTS(g_aStubs); i++)
220	{
221	if (!RTStrICmp(g_aStubs[i].pszName, pszName))
222	return &g_aStubs[i];
223	}
224	return NULL;
225	}
226
227
228	/**
229	* Wrapper around DBGCCreate() to get it working as a callback.
230	*/
231	static DECLCALLBACK(int) dbgcIoNativeStubRunloop(PUVM pUVM, PCDBGCIO pIo, unsigned fFlags)
232	{
233	return DBGCCreate(pUVM, pIo, fFlags);
234	}
235
236
237	/**
238	* @interface_method_impl{DBGCIO,pfnDestroy}
239	*/
240	static DECLCALLBACK(void) dbgcIoAsciiDestroy(PCDBGCIO pIo)
241	{
242	PDBGCIOSVC pIoSvc = RT_FROM_MEMBER(pIo, DBGCIOSVC, IoAscii);
243	pIoSvc->pIo->pfnDestroy(pIoSvc->pIo);
244	}
245
246
247	/**
248	* @interface_method_impl{DBGCIO,pfnInput}
249	*/
250	static DECLCALLBACK(bool) dbgcIoAsciiInput(PCDBGCIO pIo, uint32_t cMillies)
251	{
252	PDBGCIOSVC pIoSvc = RT_FROM_MEMBER(pIo, DBGCIOSVC, IoAscii);
253	return pIoSvc->pIo->pfnInput(pIoSvc->pIo, cMillies);
254	}
255
256
257	/**
258	* @interface_method_impl{DBGCIO,pfnRead}
259	*/
260	static DECLCALLBACK(int) dbgcIoAsciiRead(PCDBGCIO pIo, void pvBuf, size_t cbBuf, size_t pcbRead)
261	{
262	PDBGCIOSVC pIoSvc = RT_FROM_MEMBER(pIo, DBGCIOSVC, IoAscii);
263	return pIoSvc->pIo->pfnRead(pIoSvc->pIo, pvBuf, cbBuf, pcbRead);
264	}
265
266
267	/**
268	* @interface_method_impl{DBGCIO,pfnWrite}
269	*/
270	static DECLCALLBACK(int) dbgcIoAsciiWrite(PCDBGCIO pIo, const void pvBuf, size_t cbBuf, size_t pcbWritten)
271	{
272	PDBGCIOSVC pIoSvc = RT_FROM_MEMBER(pIo, DBGCIOSVC, IoAscii);
273
274	/*
275	* convert '\n' to '\r\n' while writing.
276	*/
277	int rc = 0;
278	size_t cbLeft = cbBuf;
279	while (cbLeft)
280	{
281	size_t cb = cbLeft;
282	/* write newlines */
283	if ((const char )pvBuf == '\n')
284	{
285	rc = pIoSvc->pIo->pfnWrite(pIoSvc->pIo, "\r\n", 2, NULL);
286	cb = 1;
287	}
288	/* write till next newline */
289	else
290	{
291	const char pszNL = (const char )memchr(pvBuf, '\n', cbLeft);
292	if (pszNL)
293	cb = (uintptr_t)pszNL - (uintptr_t)pvBuf;
294	rc = pIoSvc->pIo->pfnWrite(pIoSvc->pIo, pvBuf, cb, NULL);
295	}
296	if (RT_FAILURE(rc))
297	break;
298
299	/* advance */
300	cbLeft -= cb;
301	pvBuf = (const char *)pvBuf + cb;
302	}
303
304	/*
305	* Set returned value and return.
306	*/
307	if (pcbWritten)
308	*pcbWritten = cbBuf - cbLeft;
309	return rc;
310	}
311
312
313	/**
314	* @interface_method_impl{DBGCIO,pfnSetReady}
315	*/
316	static DECLCALLBACK(void) dbgcIoAsciiSetReady(PCDBGCIO pIo, bool fReady)
317	{
318	PDBGCIOSVC pIoSvc = RT_FROM_MEMBER(pIo, DBGCIOSVC, IoAscii);
319	return pIoSvc->pIo->pfnSetReady(pIoSvc->pIo, fReady);
320	}
321
322
323	/**
324	* The I/O thread handling the service.
325	*/
326	static DECLCALLBACK(int) dbgcIoSvcThread(RTTHREAD hThreadSelf, void *pvUser)
327	{
328	RT_NOREF(hThreadSelf);
329
330	int rc = VINF_SUCCESS;
331	PDBGCIOSVC pIoSvc = (PDBGCIOSVC)pvUser;
332	PDBGCIOINT pDbgcIo = pIoSvc->pDbgcIo;
333	PCDBGCIOPROVREG pIoProvReg = pIoSvc->pIoProvReg;
334
335	while (!ASMAtomicReadBool(&pDbgcIo->fShutdown))
336	{
337	/* Wait until someone connects. */
338	rc = pIoProvReg->pfnWaitForConnect(pIoSvc->hDbgcIoProv, RT_INDEFINITE_WAIT, &pIoSvc->pIo);
339	if (RT_SUCCESS(rc))
340	{
341	PCDBGCIO pIo = pIoSvc->pIo;
342
343	if (pIoSvc->pStub->fAscii)
344	{
345	pIoSvc->IoAscii.pfnDestroy = dbgcIoAsciiDestroy;
346	pIoSvc->IoAscii.pfnInput = dbgcIoAsciiInput;
347	pIoSvc->IoAscii.pfnRead = dbgcIoAsciiRead;
348	pIoSvc->IoAscii.pfnWrite = dbgcIoAsciiWrite;
349	pIoSvc->IoAscii.pfnSetReady = dbgcIoAsciiSetReady;
350	pIo = &pIoSvc->IoAscii;
351	}
352
353	/* call the runloop for the connection. */
354	pIoSvc->pStub->pfnRunloop(pIoSvc->pUVM, pIo, 0 /fFlags/);
355
356	pIo->pfnDestroy(pIo);
357	}
358	else if ( rc != VERR_TIMEOUT
359	&& rc != VERR_INTERRUPTED)
360	break;
361	}
362
363	if (!ASMAtomicDecU32(&pDbgcIo->cSvcsRunning))
364	dbgcIoDestroy(pDbgcIo);
365
366	return rc;
367	}
368
369
370	static int dbgcIoSvcInitWorker(PUVM pUVM, PDBGCIOSVC pIoSvc, PCDBGCIOPROVREG pIoProvReg,
371	PCDBGCSTUB pStub, PCFGMNODE pCfg, const char *pszName,
372	bool fIgnoreNetAddrInUse)
373	{
374	pIoSvc->pUVM = pUVM;
375	pIoSvc->pIoProvReg = pIoProvReg;
376	pIoSvc->pStub = pStub;
377
378	/* Create the provider instance and spawn the dedicated thread handling that service. */
379	int rc = pIoProvReg->pfnCreate(&pIoSvc->hDbgcIoProv, pCfg);
380	if (RT_SUCCESS(rc))
381	{
382	rc = RTThreadCreateF(&pIoSvc->hThreadSvc, dbgcIoSvcThread, pIoSvc, 0 /cbStack/,
383	RTTHREADTYPE_DEBUGGER, RTTHREADFLAGS_WAITABLE, "DbgcThrd-%s", pszName);
384	if (RT_SUCCESS(rc))
385	{
386	ASMAtomicIncU32(&pIoSvc->pDbgcIo->cSvcsRunning);
387	return VINF_SUCCESS;
388	}
389	else
390	rc = VMR3SetError(pUVM, rc, RT_SRC_POS,
391	"Configuration error: Creating an instance of the service \"%s\" failed",
392	pszName);
393
394	pIoProvReg->pfnDestroy(pIoSvc->hDbgcIoProv);
395	}
396	else if ( rc != VERR_NET_ADDRESS_IN_USE
397	\|\| !fIgnoreNetAddrInUse)
398	rc = VMR3SetError(pUVM, rc, RT_SRC_POS,
399	"Configuration error: Creating an instance of the I/O provider \"%s\" failed",
400	pIoProvReg->pszName);
401
402	return rc;
403	}
404
405
406	/**
407	* Tries to initialize the given I/O service from the given config.
408	*
409	* @returns VBox status code.
410	* @param pUVM The user mode VM handle.
411	* @param pIoSvc The I/O service instance to initialize.
412	* @param pCfg The config for the instance.
413	*/
414	static int dbgcIoSvcInit(PUVM pUVM, PDBGCIOSVC pIoSvc, PCFGMNODE pCfg)
415	{
416	char szName[32 + 1]; RT_ZERO(szName);
417	int rc = CFGMR3GetName(pCfg, &szName[0], sizeof(szName));
418	if (RT_SUCCESS(rc))
419	{
420	char szIoProvName[32 + 1]; RT_ZERO(szIoProvName);
421	rc = CFGMR3QueryString(pCfg, "Provider", &szIoProvName[0], sizeof(szIoProvName));
422	if (RT_SUCCESS(rc))
423	{
424	char szStub[32 + 1]; RT_ZERO(szStub);
425	rc = CFGMR3QueryString(pCfg, "StubType", &szStub[0], sizeof(szStub));
426	if (RT_SUCCESS(rc))
427	{
428	PCDBGCIOPROVREG pIoProvReg = dbgcIoProvFindRegByName(szIoProvName);
429	if (pIoProvReg)
430	{
431	PCDBGCSTUB pStub = dbgcIoFindStubByName(szStub);
432	if (pStub)
433	rc = dbgcIoSvcInitWorker(pUVM, pIoSvc, pIoProvReg, pStub, pCfg, szName,
434	false /fIgnoreNetAddrInUse/);
435	else
436	rc = VMR3SetError(pUVM, VERR_NOT_FOUND, RT_SRC_POS, "Configuration error: The stub type \"%s\" could not be found",
437	szStub);
438	}
439	else
440	rc = VMR3SetError(pUVM, VERR_NOT_FOUND, RT_SRC_POS, "Configuration error: The provider \"%s\" could not be found",
441	szIoProvName);
442	}
443	else
444	rc = VM_SET_ERROR_U(pUVM, rc, "Configuration error: Querying \"StubType\" failed");
445	}
446	else
447	rc = VM_SET_ERROR_U(pUVM, rc, "Configuration error: Querying \"Provider\" failed");
448	}
449	else
450	rc = VM_SET_ERROR_U(pUVM, rc, "Configuration error: Querying service identifier failed (maybe too long)");
451
452	return rc;
453	}
454
455
456	/**
457	* Creates the DBGC I/O services from the legacy TCP config.
458	*
459	* @returns VBox status code.
460	* @param pUVM The user mode VM handle.
461	* @param pKey The config key.
462	* @param ppvData Where to store the I/o instance data on success.
463	*/
464	static int dbgcIoCreateLegacyTcp(PUVM pUVM, PCFGMNODE pKey, void **ppvData)
465	{
466	bool fEnabled;
467	int rc = CFGMR3QueryBoolDef(pKey, "Enabled", &fEnabled,
468	#if defined(VBOX_WITH_DEBUGGER) && defined(VBOX_WITH_DEBUGGER_TCP_BY_DEFAULT)
469	true
470	#else
471	false
472	#endif
473	);
474	if (RT_FAILURE(rc))
475	return VM_SET_ERROR_U(pUVM, rc, "Configuration error: Failed querying \"DBGC/Enabled\"");
476
477	if (!fEnabled)
478	{
479	LogFlow(("DBGCTcpCreate: returns VINF_SUCCESS (Disabled)\n"));
480	return VINF_SUCCESS;
481	}
482
483	PDBGCIOINT pDbgcIo = (PDBGCIOINT)RTMemAllocZ(RT_UOFFSETOF_DYN(DBGCIOINT, aSvc[1]));
484	if (RT_LIKELY(pDbgcIo))
485	{
486	pDbgcIo->aSvc[0].pDbgcIo = pDbgcIo;
487	pDbgcIo->cSvcsCfg = 1;
488	pDbgcIo->cSvcsRunning = 1;
489	rc = dbgcIoSvcInitWorker(pUVM, &pDbgcIo->aSvc[0], &g_DbgcIoProvTcp, &g_aStubs[0], pKey, "TCP",
490	true /fIgnoreNetAddrInUse/);
491	if (RT_SUCCESS(rc))
492	{
493	*ppvData = pDbgcIo;
494	return VINF_SUCCESS;
495	}
496
497	RTMemFree(pDbgcIo);
498	if (rc == VERR_NET_ADDRESS_IN_USE)
499	rc = VINF_SUCCESS;
500	}
501	else
502	rc = VERR_NO_MEMORY;
503
504	if (RT_FAILURE(rc))
505	rc = VM_SET_ERROR_U(pUVM, rc, "Cannot start TCP-based debugging console service");
506	return rc;
507	}
508
509
510	/**
511	* Sets up debugger I/O based on the VM config.
512	*
513	* @returns VBox status code.
514	* @param pUVM The user mode VM handle.
515	* @param ppvData Where to store a pointer to the instance data.
516	*/
517	DBGDECL(int) DBGCIoCreate(PUVM pUVM, void **ppvData)
518	{
519	/*
520	* Check what the configuration says.
521	*/
522	PCFGMNODE pKey = CFGMR3GetChild(CFGMR3GetRootU(pUVM), "DBGC");
523	uint32_t cSvcs = dbgcIoGetSvcCount(pKey);
524	int rc = VINF_SUCCESS;
525
526	/* If no services are configured try the legacy config supporting TCP only. */
527	if (cSvcs)
528	{
529	PDBGCIOINT pDbgcIo = (PDBGCIOINT)RTMemAllocZ(RT_UOFFSETOF_DYN(DBGCIOINT, aSvc[cSvcs]));
530	if (RT_LIKELY(pDbgcIo))
531	{
532	pDbgcIo->cSvcsCfg = 0;
533	pDbgcIo->cSvcsRunning = 1;
534	pDbgcIo->fShutdown = false;
535
536	for (uint32_t i = 0; i < cSvcs; i++)
537	pDbgcIo->aSvc[i].hThreadSvc = NIL_RTTHREAD;
538
539	PCFGMNODE pSvcCfg = CFGMR3GetFirstChild(pKey);
540	for (uint32_t i = 0; i < cSvcs && RT_SUCCESS(rc); i++)
541	{
542	pDbgcIo->aSvc[i].pDbgcIo = pDbgcIo;
543
544	rc = dbgcIoSvcInit(pUVM, &pDbgcIo->aSvc[i], pSvcCfg);
545	if (RT_SUCCESS(rc))
546	pDbgcIo->cSvcsCfg++;
547	else
548	rc = VM_SET_ERROR_U(pUVM, rc, "Failed to initialize the debugger I/O service");
549
550	pSvcCfg = CFGMR3GetNextChild(pSvcCfg);
551	}
552
553	if (RT_SUCCESS(rc))
554	*ppvData = pDbgcIo;
555	else
556	{
557	if (!ASMAtomicDecU32(&pDbgcIo->cSvcsRunning))
558	dbgcIoDestroy(pDbgcIo);
559	}
560	}
561	else
562	rc = VM_SET_ERROR_U(pUVM, VERR_NO_MEMORY, "Failed to allocate memory for the debugger I/O service");
563	}
564	else
565	rc = dbgcIoCreateLegacyTcp(pUVM, pKey, ppvData);
566
567	return rc;
568	}
569
570
571	/**
572	* Terminates any running debugger services.
573	*
574	* @returns VBox status code.
575	* @param pUVM The user mode VM handle.
576	* @param pvData The data returned by DBGCIoCreate.
577	*/
578	DBGDECL(int) DBGCIoTerminate(PUVM pUVM, void *pvData)
579	{
580	RT_NOREF(pUVM);
581	PDBGCIOINT pDbgcIo = (PDBGCIOINT)pvData;
582
583	if (pDbgcIo)
584	{
585	ASMAtomicXchgBool(&pDbgcIo->fShutdown, true);
586
587	for (uint32_t i = 0; i < pDbgcIo->cSvcsCfg; i++)
588	{
589	PDBGCIOSVC pIoSvc = &pDbgcIo->aSvc[i];
590
591	if (pIoSvc->hThreadSvc != NIL_RTTHREAD)
592	pIoSvc->pIoProvReg->pfnWaitInterrupt(pIoSvc->hDbgcIoProv);
593	}
594
595	if (!ASMAtomicDecU32(&pDbgcIo->cSvcsRunning))
596	dbgcIoDestroy(pDbgcIo);
597	}
598
599	return VINF_SUCCESS;
600	}
601

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source: vbox/trunk/src/VBox/Debugger/DBGCIo.cpp@ 96014

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