/* $Id: DBGCTcp.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */ /** @file * DBGC - Debugger Console, TCP backend. */ /* * Copyright (C) 2006-2020 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. */ /********************************************************************************************************************************* * Header Files * *********************************************************************************************************************************/ #include #include #include #include #include #include #include #include /********************************************************************************************************************************* * Structures and Typedefs * *********************************************************************************************************************************/ /** * Debug console TCP backend instance data. */ typedef struct DBGCTCP { /** The I/O backend for the console. */ DBGCBACK Back; /** The socket of the connection. */ RTSOCKET Sock; /** Connection status. */ bool fAlive; } DBGCTCP; /** Pointer to the instance data of the console TCP backend. */ typedef DBGCTCP *PDBGCTCP; /** Converts a pointer to DBGCTCP::Back to a pointer to DBGCTCP. */ #define DBGCTCP_BACK2DBGCTCP(pBack) ( (PDBGCTCP)((char *)(pBack) - RT_UOFFSETOF(DBGCTCP, Back)) ) /********************************************************************************************************************************* * Internal Functions * *********************************************************************************************************************************/ static DECLCALLBACK(int) dbgcTcpConnection(RTSOCKET Sock, void *pvUser); /** * Checks if there is input. * * @returns true if there is input ready. * @returns false if there not input ready. * @param pBack Pointer to the backend structure supplied by * the backend. The backend can use this to find * it's instance data. * @param cMillies Number of milliseconds to wait on input data. */ static DECLCALLBACK(bool) dbgcTcpBackInput(PDBGCBACK pBack, uint32_t cMillies) { PDBGCTCP pDbgcTcp = DBGCTCP_BACK2DBGCTCP(pBack); if (!pDbgcTcp->fAlive) return false; int rc = RTTcpSelectOne(pDbgcTcp->Sock, cMillies); if (RT_FAILURE(rc) && rc != VERR_TIMEOUT) pDbgcTcp->fAlive = false; return rc != VERR_TIMEOUT; } /** * Read input. * * @returns VBox status code. * @param pBack Pointer to the backend structure supplied by * the backend. The backend can use this to find * it's instance data. * @param pvBuf Where to put the bytes we read. * @param cbBuf Maximum nymber of bytes to read. * @param pcbRead Where to store the number of bytes actually read. * If NULL the entire buffer must be filled for a * successful return. */ static DECLCALLBACK(int) dbgcTcpBackRead(PDBGCBACK pBack, void *pvBuf, size_t cbBuf, size_t *pcbRead) { PDBGCTCP pDbgcTcp = DBGCTCP_BACK2DBGCTCP(pBack); if (!pDbgcTcp->fAlive) return VERR_INVALID_HANDLE; int rc = RTTcpRead(pDbgcTcp->Sock, pvBuf, cbBuf, pcbRead); if (RT_SUCCESS(rc) && pcbRead != NULL && *pcbRead == 0) rc = VERR_NET_SHUTDOWN; if (RT_FAILURE(rc)) pDbgcTcp->fAlive = false; return rc; } /** * Write (output). * * @returns VBox status code. * @param pBack Pointer to the backend structure supplied by * the backend. The backend can use this to find * it's instance data. * @param pvBuf What to write. * @param cbBuf Number of bytes to write. * @param pcbWritten Where to store the number of bytes actually written. * If NULL the entire buffer must be successfully written. */ static DECLCALLBACK(int) dbgcTcpBackWrite(PDBGCBACK pBack, const void *pvBuf, size_t cbBuf, size_t *pcbWritten) { PDBGCTCP pDbgcTcp = DBGCTCP_BACK2DBGCTCP(pBack); if (!pDbgcTcp->fAlive) return VERR_INVALID_HANDLE; /* * convert '\n' to '\r\n' while writing. */ int rc = 0; size_t cbLeft = cbBuf; while (cbLeft) { size_t cb = cbLeft; /* write newlines */ if (*(const char *)pvBuf == '\n') { rc = RTTcpWrite(pDbgcTcp->Sock, "\r\n", 2); cb = 1; } /* write till next newline */ else { const char *pszNL = (const char *)memchr(pvBuf, '\n', cbLeft); if (pszNL) cb = (uintptr_t)pszNL - (uintptr_t)pvBuf; rc = RTTcpWrite(pDbgcTcp->Sock, pvBuf, cb); } if (RT_FAILURE(rc)) { pDbgcTcp->fAlive = false; break; } /* advance */ cbLeft -= cb; pvBuf = (const char *)pvBuf + cb; } /* * Set returned value and return. */ if (pcbWritten) *pcbWritten = cbBuf - cbLeft; return rc; } /** @copydoc FNDBGCBACKSETREADY */ static DECLCALLBACK(void) dbgcTcpBackSetReady(PDBGCBACK pBack, bool fReady) { /* stub */ NOREF(pBack); NOREF(fReady); } /** * Serve a TCP Server connection. * * @returns VBox status code. * @returns VERR_TCP_SERVER_STOP to terminate the server loop forcing * the RTTcpCreateServer() call to return. * @param Sock The socket which the client is connected to. * The call will close this socket. * @param pvUser The VM handle. */ static DECLCALLBACK(int) dbgcTcpConnection(RTSOCKET Sock, void *pvUser) { LogFlow(("dbgcTcpConnection: connection! Sock=%d pvUser=%p\n", Sock, pvUser)); /* * Start the console. */ DBGCTCP DbgcTcp; DbgcTcp.Back.pfnInput = dbgcTcpBackInput; DbgcTcp.Back.pfnRead = dbgcTcpBackRead; DbgcTcp.Back.pfnWrite = dbgcTcpBackWrite; DbgcTcp.Back.pfnSetReady = dbgcTcpBackSetReady; DbgcTcp.fAlive = true; DbgcTcp.Sock = Sock; int rc = DBGCCreate((PUVM)pvUser, &DbgcTcp.Back, 0); LogFlow(("dbgcTcpConnection: disconnect rc=%Rrc\n", rc)); return rc; } /** * Spawns a new thread with a TCP based debugging console service. * * @returns VBox status code. * @param pUVM The user mode VM handle. * @param ppvData Where to store a pointer to the instance data. */ DBGDECL(int) DBGCTcpCreate(PUVM pUVM, void **ppvData) { /* * Check what the configuration says. */ PCFGMNODE pKey = CFGMR3GetChild(CFGMR3GetRootU(pUVM), "DBGC"); bool fEnabled; int rc = CFGMR3QueryBoolDef(pKey, "Enabled", &fEnabled, #if defined(VBOX_WITH_DEBUGGER) && defined(VBOX_WITH_DEBUGGER_TCP_BY_DEFAULT) && !defined(__L4ENV__) && !defined(DEBUG_dmik) true #else false #endif ); if (RT_FAILURE(rc)) return VM_SET_ERROR_U(pUVM, rc, "Configuration error: Failed querying \"DBGC/Enabled\""); if (!fEnabled) { LogFlow(("DBGCTcpCreate: returns VINF_SUCCESS (Disabled)\n")); return VINF_SUCCESS; } /* * Get the port configuration. */ uint32_t u32Port; rc = CFGMR3QueryU32Def(pKey, "Port", &u32Port, 5000); if (RT_FAILURE(rc)) return VM_SET_ERROR_U(pUVM, rc, "Configuration error: Failed querying \"DBGC/Port\""); /* * Get the address configuration. */ char szAddress[512]; rc = CFGMR3QueryStringDef(pKey, "Address", szAddress, sizeof(szAddress), ""); if (RT_FAILURE(rc)) return VM_SET_ERROR_U(pUVM, rc, "Configuration error: Failed querying \"DBGC/Address\""); /* * Create the server (separate thread). */ PRTTCPSERVER pServer; rc = RTTcpServerCreate(szAddress, u32Port, RTTHREADTYPE_DEBUGGER, "DBGC", dbgcTcpConnection, pUVM, &pServer); if (RT_SUCCESS(rc)) { LogFlow(("DBGCTcpCreate: Created server on port %d %s\n", u32Port, szAddress)); *ppvData = pServer; return rc; } LogFlow(("DBGCTcpCreate: returns %Rrc\n", rc)); return VM_SET_ERROR_U(pUVM, rc, "Cannot start TCP-based debugging console service"); } /** * Terminates any running TCP base debugger console service. * * @returns VBox status code. * @param pUVM The user mode VM handle. * @param pvData The data returned by DBGCTcpCreate. */ DBGDECL(int) DBGCTcpTerminate(PUVM pUVM, void *pvData) { RT_NOREF1(pUVM); /* * Destroy the server instance if any. */ if (pvData) { int rc = RTTcpServerDestroy((PRTTCPSERVER)pvData); AssertRC(rc); } return VINF_SUCCESS; }