| 1 | /** $Id: clipboard.cpp 44528 2013-02-04 14:27:54Z vboxsync $ */
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| 2 | /** @file
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| 3 | * Guest Additions - X11 Shared Clipboard.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2012 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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| 18 | /****************************************************************************
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| 19 | * Header Files *
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| 20 | ****************************************************************************/
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| 21 | #include <iprt/alloc.h>
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| 22 | #include <iprt/asm.h>
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| 23 | #include <iprt/assert.h>
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| 24 | #include <iprt/initterm.h>
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| 25 | #include <iprt/mem.h>
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| 26 | #include <iprt/string.h>
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| 27 | #include <iprt/process.h>
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| 28 | #include <iprt/semaphore.h>
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| 29 |
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| 30 | #include <VBox/log.h>
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| 31 | #include <VBox/VBoxGuestLib.h>
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| 32 | #include <VBox/HostServices/VBoxClipboardSvc.h>
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| 33 | #include <VBox/GuestHost/SharedClipboard.h>
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| 34 |
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| 35 | #include "VBoxClient.h"
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| 36 |
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| 37 | /****************************************************************************
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| 38 | * Global Variables *
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| 39 | ****************************************************************************/
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| 40 |
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| 41 | /**
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| 42 | * Global clipboard context information.
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| 43 | */
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| 44 | struct _VBOXCLIPBOARDCONTEXT
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| 45 | {
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| 46 | /** Client ID for the clipboard subsystem */
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| 47 | uint32_t client;
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| 48 |
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| 49 | /** Pointer to the X11 clipboard backend */
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| 50 | CLIPBACKEND *pBackend;
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| 51 | };
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| 52 |
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| 53 | /** Only one client is supported. There seems to be no need for more clients. */
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| 54 | static VBOXCLIPBOARDCONTEXT g_ctx;
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| 55 |
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| 56 |
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| 57 | /**
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| 58 | * Transfer clipboard data from the guest to the host.
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| 59 | *
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| 60 | * @returns VBox result code
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| 61 | * @param u32Format The format of the data being sent
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| 62 | * @param pv Pointer to the data being sent
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| 63 | * @param cb Size of the data being sent in bytes
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| 64 | */
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| 65 | static int vboxClipboardSendData(uint32_t u32Format, void *pv, uint32_t cb)
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| 66 | {
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| 67 | int rc;
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| 68 | LogRelFlowFunc(("u32Format=%d, pv=%p, cb=%d\n", u32Format, pv, cb));
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| 69 | rc = VbglR3ClipboardWriteData(g_ctx.client, u32Format, pv, cb);
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| 70 | LogRelFlowFunc(("rc=%Rrc\n", rc));
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| 71 | return rc;
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| 72 | }
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| 73 |
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| 74 |
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| 75 | /**
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| 76 | * Get clipboard data from the host.
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| 77 | *
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| 78 | * @returns VBox result code
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| 79 | * @param u32Format The format of the data being requested
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| 80 | * @retval ppv On success and if pcb > 0, this will point to a buffer
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| 81 | * to be freed with RTMemFree containing the data read.
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| 82 | * @retval pcb On success, this contains the number of bytes of data
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| 83 | * returned
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| 84 | */
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| 85 | int ClipRequestDataForX11(VBOXCLIPBOARDCONTEXT *pCtx, uint32_t u32Format,
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| 86 | void **ppv, uint32_t *pcb)
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| 87 | {
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| 88 | int rc = VINF_SUCCESS;
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| 89 | uint32_t cb = 1024;
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| 90 | void *pv = RTMemAlloc(cb);
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| 91 |
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| 92 | *ppv = 0;
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| 93 | LogRelFlowFunc(("u32Format=%u\n", u32Format));
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| 94 | if (RT_UNLIKELY(!pv))
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| 95 | rc = VERR_NO_MEMORY;
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| 96 | if (RT_SUCCESS(rc))
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| 97 | rc = VbglR3ClipboardReadData(g_ctx.client, u32Format, pv, cb, pcb);
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| 98 | if (RT_SUCCESS(rc) && (rc != VINF_BUFFER_OVERFLOW))
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| 99 | *ppv = pv;
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| 100 | /* A return value of VINF_BUFFER_OVERFLOW tells us to try again with a
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| 101 | * larger buffer. The size of the buffer needed is placed in *pcb.
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| 102 | * So we start all over again. */
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| 103 | if (rc == VINF_BUFFER_OVERFLOW)
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| 104 | {
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| 105 | cb = *pcb;
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| 106 | RTMemFree(pv);
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| 107 | pv = RTMemAlloc(cb);
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| 108 | if (RT_UNLIKELY(!pv))
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| 109 | rc = VERR_NO_MEMORY;
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| 110 | if (RT_SUCCESS(rc))
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| 111 | rc = VbglR3ClipboardReadData(g_ctx.client, u32Format, pv, cb, pcb);
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| 112 | if (RT_SUCCESS(rc) && (rc != VINF_BUFFER_OVERFLOW))
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| 113 | *ppv = pv;
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| 114 | }
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| 115 | /* Catch other errors. This also catches the case in which the buffer was
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| 116 | * too small a second time, possibly because the clipboard contents
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| 117 | * changed half-way through the operation. Since we can't say whether or
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| 118 | * not this is actually an error, we just return size 0.
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| 119 | */
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| 120 | if (RT_FAILURE(rc) || (VINF_BUFFER_OVERFLOW == rc))
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| 121 | {
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| 122 | *pcb = 0;
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| 123 | if (pv != NULL)
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| 124 | RTMemFree(pv);
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| 125 | }
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| 126 | LogRelFlowFunc(("returning %Rrc\n", rc));
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| 127 | if (RT_SUCCESS(rc))
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| 128 | LogRelFlow((" *pcb=%d\n", *pcb));
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| 129 | return rc;
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| 130 | }
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| 131 |
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| 132 | /** Opaque data structure describing a request from the host for clipboard
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| 133 | * data, passed in when the request is forwarded to the X11 backend so that
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| 134 | * it can be completed correctly. */
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| 135 | struct _CLIPREADCBREQ
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| 136 | {
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| 137 | /** The data format that was requested. */
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| 138 | uint32_t u32Format;
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| 139 | };
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| 140 |
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| 141 | /**
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| 142 | * Tell the host that new clipboard formats are available.
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| 143 | *
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| 144 | * @param u32Formats The formats to advertise
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| 145 | */
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| 146 | void ClipReportX11Formats(VBOXCLIPBOARDCONTEXT *pCtx, uint32_t u32Formats)
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| 147 | {
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| 148 | int rc;
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| 149 | LogRelFlowFunc(("u32Formats=%d\n", u32Formats));
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| 150 | rc = VbglR3ClipboardReportFormats(g_ctx.client, u32Formats);
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| 151 | LogRelFlowFunc(("rc=%Rrc\n", rc));
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| 152 | }
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| 153 |
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| 154 | /** This is called by the backend to tell us that a request for data from
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| 155 | * X11 has completed.
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| 156 | * @param pCtx Our context information
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| 157 | * @param rc the iprt result code of the request
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| 158 | * @param pReq the request structure that we passed in when we started
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| 159 | * the request. We RTMemFree() this in this function.
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| 160 | * @param pv the clipboard data returned from X11 if the request
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| 161 | * succeeded (see @a rc)
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| 162 | * @param cb the size of the data in @a pv
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| 163 | */
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| 164 | void ClipCompleteDataRequestFromX11(VBOXCLIPBOARDCONTEXT *pCtx, int rc,
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| 165 | CLIPREADCBREQ *pReq, void *pv,
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| 166 | uint32_t cb)
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| 167 | {
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| 168 | if (RT_SUCCESS(rc))
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| 169 | vboxClipboardSendData(pReq->u32Format, pv, cb);
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| 170 | else
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| 171 | vboxClipboardSendData(0, NULL, 0);
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| 172 | RTMemFree(pReq);
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| 173 | }
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| 174 |
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| 175 | /**
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| 176 | * Connect the guest clipboard to the host.
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| 177 | *
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| 178 | * @returns VBox status code
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| 179 | */
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| 180 | int vboxClipboardConnect(void)
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| 181 | {
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| 182 | int rc = VINF_SUCCESS;
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| 183 | LogRelFlowFunc(("\n"));
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| 184 |
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| 185 | /* Sanity */
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| 186 | AssertReturn(g_ctx.client == 0, VERR_WRONG_ORDER);
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| 187 | g_ctx.pBackend = ClipConstructX11(&g_ctx, false);
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| 188 | if (!g_ctx.pBackend)
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| 189 | rc = VERR_NO_MEMORY;
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| 190 | if (RT_SUCCESS(rc))
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| 191 | rc = ClipStartX11(g_ctx.pBackend);
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| 192 | if (RT_SUCCESS(rc))
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| 193 | {
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| 194 | rc = VbglR3ClipboardConnect(&g_ctx.client);
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| 195 | if (RT_FAILURE(rc))
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| 196 | LogRel(("Error connecting to host. rc=%Rrc\n", rc));
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| 197 | else if (!g_ctx.client)
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| 198 | {
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| 199 | LogRel(("Invalid client ID of 0\n"));
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| 200 | rc = VERR_NOT_SUPPORTED;
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| 201 | }
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| 202 | }
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| 203 |
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| 204 | if (RT_FAILURE(rc) && g_ctx.pBackend)
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| 205 | ClipDestructX11(g_ctx.pBackend);
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| 206 | LogRelFlowFunc(("g_ctx.client=%u rc=%Rrc\n", g_ctx.client, rc));
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| 207 | return rc;
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| 208 | }
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| 209 |
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| 210 | /**
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| 211 | * The main loop of our clipboard reader.
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| 212 | */
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| 213 | int vboxClipboardMain(void)
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| 214 | {
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| 215 | int rc;
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| 216 | LogRelFlowFunc(("Starting guest clipboard service\n"));
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| 217 | bool fExiting = false;
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| 218 |
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| 219 | while (!fExiting)
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| 220 | {
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| 221 | uint32_t Msg;
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| 222 | uint32_t fFormats;
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| 223 | rc = VbglR3ClipboardGetHostMsg(g_ctx.client, &Msg, &fFormats);
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| 224 | if (RT_SUCCESS(rc))
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| 225 | {
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| 226 | switch (Msg)
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| 227 | {
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| 228 | case VBOX_SHARED_CLIPBOARD_HOST_MSG_FORMATS:
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| 229 | {
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| 230 | /* The host has announced available clipboard formats.
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| 231 | * Save the information so that it is available for
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| 232 | * future requests from guest applications.
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| 233 | */
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| 234 | LogRelFlowFunc(("VBOX_SHARED_CLIPBOARD_HOST_MSG_FORMATS fFormats=%x\n", fFormats));
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| 235 | ClipAnnounceFormatToX11(g_ctx.pBackend, fFormats);
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| 236 | break;
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| 237 | }
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| 238 |
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| 239 | case VBOX_SHARED_CLIPBOARD_HOST_MSG_READ_DATA:
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| 240 | {
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| 241 | /* The host needs data in the specified format. */
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| 242 | LogRelFlowFunc(("VBOX_SHARED_CLIPBOARD_HOST_MSG_READ_DATA fFormats=%x\n", fFormats));
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| 243 | CLIPREADCBREQ *pReq;
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| 244 | pReq = (CLIPREADCBREQ *)RTMemAllocZ(sizeof(*pReq));
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| 245 | if (!pReq)
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| 246 | {
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| 247 | rc = VERR_NO_MEMORY;
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| 248 | fExiting = true;
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| 249 | }
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| 250 | else
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| 251 | {
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| 252 | pReq->u32Format = fFormats;
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| 253 | ClipRequestDataFromX11(g_ctx.pBackend, fFormats,
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| 254 | pReq);
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| 255 | }
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| 256 | break;
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| 257 | }
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| 258 |
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| 259 | case VBOX_SHARED_CLIPBOARD_HOST_MSG_QUIT:
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| 260 | {
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| 261 | /* The host is terminating. */
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| 262 | LogRelFlowFunc(("VBOX_SHARED_CLIPBOARD_HOST_MSG_QUIT\n"));
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| 263 | if (RT_SUCCESS(ClipStopX11(g_ctx.pBackend)))
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| 264 | ClipDestructX11(g_ctx.pBackend);
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| 265 | fExiting = true;
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| 266 | break;
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| 267 | }
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| 268 |
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| 269 | default:
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| 270 | LogRel2(("Unsupported message from host!!!\n"));
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| 271 | }
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| 272 | }
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| 273 |
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| 274 | LogRelFlow(("processed host event rc = %d\n", rc));
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| 275 | }
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| 276 | LogRelFlowFunc(("rc=%d\n", rc));
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| 277 | return rc;
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| 278 | }
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| 279 |
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| 280 | class ClipboardService : public VBoxClient::Service
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| 281 | {
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| 282 | public:
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| 283 | virtual const char *getPidFilePath()
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| 284 | {
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| 285 | return ".vboxclient-clipboard.pid";
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| 286 | }
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| 287 | virtual int run(bool fDaemonised /* = false */)
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| 288 | {
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| 289 | int rc = vboxClipboardConnect();
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| 290 | if (RT_SUCCESS(rc))
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| 291 | rc = vboxClipboardMain();
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| 292 | if (RT_FAILURE(rc))
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| 293 | LogRelFunc(("guest clipboard service terminated abnormally: return code %Rrc\n", rc));
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| 294 | return rc;
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| 295 | }
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| 296 | virtual void cleanup()
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| 297 | {
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| 298 | /* Nothing to do. */
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| 299 | }
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| 300 | };
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| 301 |
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| 302 | VBoxClient::Service *VBoxClient::GetClipboardService()
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| 303 | {
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| 304 | return new ClipboardService;
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| 305 | }
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