1 | /* $Id: VBoxSharedClipboardSvc-x11.cpp 100204 2023-06-19 09:11:37Z vboxsync $ */
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2 | /** @file
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3 | * Shared Clipboard Service - Linux host.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2023 Oracle and/or its affiliates.
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8 | *
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9 | * This file is part of VirtualBox base platform packages, as
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10 | * available from https://www.virtualbox.org.
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11 | *
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12 | * This program is free software; you can redistribute it and/or
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13 | * modify it under the terms of the GNU General Public License
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14 | * as published by the Free Software Foundation, in version 3 of the
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15 | * License.
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16 | *
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17 | * This program is distributed in the hope that it will be useful, but
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18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 | * General Public License for more details.
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21 | *
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22 | * You should have received a copy of the GNU General Public License
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23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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24 | *
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25 | * SPDX-License-Identifier: GPL-3.0-only
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26 | */
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27 |
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28 |
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29 | /*********************************************************************************************************************************
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30 | * Header Files *
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31 | *********************************************************************************************************************************/
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32 | #define LOG_GROUP LOG_GROUP_SHARED_CLIPBOARD
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33 | #include <iprt/assert.h>
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34 | #include <iprt/critsect.h>
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35 | #include <iprt/env.h>
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36 | #include <iprt/mem.h>
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37 | #include <iprt/semaphore.h>
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38 | #include <iprt/string.h>
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39 | #include <iprt/asm.h>
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40 |
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41 | #include <VBox/GuestHost/SharedClipboard.h>
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42 | #include <VBox/GuestHost/SharedClipboard-x11.h>
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43 | #include <VBox/HostServices/VBoxClipboardSvc.h>
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44 | #include <iprt/errcore.h>
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45 |
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46 | #ifdef VBOX_WITH_SHARED_CLIPBOARD_TRANSFERS_HTTP
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47 | # include <VBox/GuestHost/SharedClipboard-transfers.h>
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48 | #endif
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49 |
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50 | #include "VBoxSharedClipboardSvc-internal.h"
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51 |
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52 | /* Number of currently extablished connections. */
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53 | static volatile uint32_t g_cShClConnections;
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54 |
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55 |
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56 | /*********************************************************************************************************************************
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57 | * Structures and Typedefs *
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58 | *********************************************************************************************************************************/
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59 | /**
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60 | * Global context information used by the host glue for the X11 clipboard backend.
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61 | */
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62 | struct SHCLCONTEXT
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63 | {
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64 | /** This mutex is grabbed during any critical operations on the clipboard
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65 | * which might clash with others. */
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66 | RTCRITSECT CritSect;
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67 | /** X11 context data. */
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68 | SHCLX11CTX X11;
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69 | /** Pointer to the VBox host client data structure. */
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70 | PSHCLCLIENT pClient;
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71 | /** We set this when we start shutting down as a hint not to post any new
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72 | * requests. */
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73 | bool fShuttingDown;
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74 | };
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75 |
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76 |
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77 | /*********************************************************************************************************************************
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78 | * Prototypes *
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79 | *********************************************************************************************************************************/
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80 | static DECLCALLBACK(int) shClSvcX11ReportFormatsCallback(PSHCLCONTEXT pCtx, uint32_t fFormats, void *pvUser);
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81 | static DECLCALLBACK(int) shClSvcX11RequestDataFromSourceCallback(PSHCLCONTEXT pCtx, SHCLFORMAT uFmt, void **ppv, uint32_t *pcb, void *pvUser);
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82 |
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83 |
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84 | int ShClBackendInit(PSHCLBACKEND pBackend, VBOXHGCMSVCFNTABLE *pTable)
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85 | {
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86 | RT_NOREF(pBackend);
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87 |
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88 | LogFlowFuncEnter();
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89 |
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90 | /* Override the connection limit. */
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91 | for (uintptr_t i = 0; i < RT_ELEMENTS(pTable->acMaxClients); i++)
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92 | pTable->acMaxClients[i] = RT_MIN(VBOX_SHARED_CLIPBOARD_X11_CONNECTIONS_MAX, pTable->acMaxClients[i]);
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93 |
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94 | RT_ZERO(pBackend->Callbacks);
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95 | /* Use internal callbacks by default. */
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96 | pBackend->Callbacks.pfnReportFormats = shClSvcX11ReportFormatsCallback;
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97 | pBackend->Callbacks.pfnOnRequestDataFromSource = shClSvcX11RequestDataFromSourceCallback;
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98 |
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99 | return VINF_SUCCESS;
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100 | }
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101 |
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102 | void ShClBackendDestroy(PSHCLBACKEND pBackend)
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103 | {
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104 | RT_NOREF(pBackend);
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105 |
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106 | LogFlowFuncEnter();
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107 | }
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108 |
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109 | void ShClBackendSetCallbacks(PSHCLBACKEND pBackend, PSHCLCALLBACKS pCallbacks)
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110 | {
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111 | #define SET_FN_IF_NOT_NULL(a_Fn) \
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112 | if (pCallbacks->pfn##a_Fn) \
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113 | pBackend->Callbacks.pfn##a_Fn = pCallbacks->pfn##a_Fn;
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114 |
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115 | SET_FN_IF_NOT_NULL(ReportFormats);
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116 | SET_FN_IF_NOT_NULL(OnRequestDataFromSource);
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117 |
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118 | #undef SET_FN_IF_NOT_NULL
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119 | }
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120 |
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121 | /**
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122 | * @note On the host, we assume that some other application already owns
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123 | * the clipboard and leave ownership to X11.
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124 | */
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125 | int ShClBackendConnect(PSHCLBACKEND pBackend, PSHCLCLIENT pClient, bool fHeadless)
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126 | {
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127 | int rc;
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128 |
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129 | /* Check if maximum allowed connections count has reached. */
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130 | if (ASMAtomicIncU32(&g_cShClConnections) > VBOX_SHARED_CLIPBOARD_X11_CONNECTIONS_MAX)
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131 | {
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132 | ASMAtomicDecU32(&g_cShClConnections);
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133 | LogRel(("Shared Clipboard: maximum amount for client connections reached\n"));
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134 | return VERR_OUT_OF_RESOURCES;
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135 | }
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136 |
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137 | PSHCLCONTEXT pCtx = (PSHCLCONTEXT)RTMemAllocZ(sizeof(SHCLCONTEXT));
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138 | if (pCtx)
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139 | {
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140 | rc = RTCritSectInit(&pCtx->CritSect);
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141 | if (RT_SUCCESS(rc))
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142 | {
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143 | rc = ShClX11Init(&pCtx->X11, &pBackend->Callbacks, pCtx, fHeadless);
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144 | if (RT_SUCCESS(rc))
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145 | {
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146 | pClient->State.pCtx = pCtx;
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147 | pCtx->pClient = pClient;
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148 |
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149 | rc = ShClX11ThreadStart(&pCtx->X11, true /* grab shared clipboard */);
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150 | if (RT_FAILURE(rc))
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151 | ShClX11Destroy(&pCtx->X11);
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152 | }
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153 |
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154 | if (RT_FAILURE(rc))
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155 | RTCritSectDelete(&pCtx->CritSect);
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156 | }
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157 |
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158 | if (RT_FAILURE(rc))
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159 | {
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160 | pClient->State.pCtx = NULL;
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161 | RTMemFree(pCtx);
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162 | }
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163 | }
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164 | else
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165 | rc = VERR_NO_MEMORY;
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166 |
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167 | if (RT_FAILURE(rc))
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168 | {
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169 | /* Restore active connections count. */
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170 | ASMAtomicDecU32(&g_cShClConnections);
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171 | }
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172 |
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173 | LogFlowFuncLeaveRC(rc);
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174 | return rc;
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175 | }
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176 |
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177 | int ShClBackendSync(PSHCLBACKEND pBackend, PSHCLCLIENT pClient)
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178 | {
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179 | RT_NOREF(pBackend);
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180 |
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181 | LogFlowFuncEnter();
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182 |
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183 | /* Tell the guest we have no data in case X11 is not available. If
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184 | * there is data in the host clipboard it will automatically be sent to
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185 | * the guest when the clipboard starts up. */
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186 | if (ShClSvcIsBackendActive())
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187 | return ShClSvcHostReportFormats(pClient, VBOX_SHCL_FMT_NONE);
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188 | return VINF_SUCCESS;
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189 | }
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190 |
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191 | /**
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192 | * Shuts down the shared clipboard service and "disconnect" the guest.
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193 | * Note! Host glue code
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194 | */
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195 | int ShClBackendDisconnect(PSHCLBACKEND pBackend, PSHCLCLIENT pClient)
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196 | {
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197 | RT_NOREF(pBackend);
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198 |
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199 | LogFlowFuncEnter();
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200 |
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201 | PSHCLCONTEXT pCtx = pClient->State.pCtx;
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202 | AssertPtr(pCtx);
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203 |
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204 | /* Drop the reference to the client, in case it is still there. This
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205 | * will cause any outstanding clipboard data requests from X11 to fail
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206 | * immediately. */
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207 | pCtx->fShuttingDown = true;
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208 |
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209 | int rc = ShClX11ThreadStop(&pCtx->X11);
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210 | /** @todo handle this slightly more reasonably, or be really sure
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211 | * it won't go wrong. */
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212 | AssertRC(rc);
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213 |
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214 | ShClX11Destroy(&pCtx->X11);
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215 | RTCritSectDelete(&pCtx->CritSect);
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216 |
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217 | RTMemFree(pCtx);
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218 |
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219 | /* Decrease active connections count. */
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220 | ASMAtomicDecU32(&g_cShClConnections);
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221 |
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222 | LogFlowFuncLeaveRC(rc);
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223 | return rc;
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224 | }
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225 |
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226 | /**
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227 | * Reports clipboard formats to the host clipboard.
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228 | */
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229 | int ShClBackendReportFormats(PSHCLBACKEND pBackend, PSHCLCLIENT pClient, SHCLFORMATS fFormats)
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230 | {
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231 | RT_NOREF(pBackend);
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232 |
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233 | int rc = ShClX11ReportFormatsToX11Async(&pClient->State.pCtx->X11, fFormats);
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234 |
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235 | LogFlowFuncLeaveRC(rc);
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236 | return rc;
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237 | }
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238 |
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239 | /**
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240 | * Reads data from the host clipboard.
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241 | *
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242 | * Schedules a request to the X11 event thread.
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243 | *
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244 | * @note We always fail or complete asynchronously.
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245 | */
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246 | int ShClBackendReadData(PSHCLBACKEND pBackend, PSHCLCLIENT pClient, PSHCLCLIENTCMDCTX pCmdCtx, SHCLFORMAT uFormat,
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247 | void *pvData, uint32_t cbData, uint32_t *pcbActual)
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248 | {
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249 | RT_NOREF(pBackend);
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250 |
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251 | AssertPtrReturn(pClient, VERR_INVALID_POINTER);
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252 | AssertPtrReturn(pCmdCtx, VERR_INVALID_POINTER);
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253 | AssertPtrReturn(pvData, VERR_INVALID_POINTER);
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254 | AssertPtrReturn(pcbActual, VERR_INVALID_POINTER);
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255 |
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256 | RT_NOREF(pCmdCtx);
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257 |
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258 | LogFlowFunc(("pClient=%p, uFormat=%#x, pv=%p, cb=%RU32, pcbActual=%p\n",
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259 | pClient, uFormat, pvData, cbData, pcbActual));
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260 |
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261 | PSHCLEVENT pEvent;
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262 | int rc = ShClEventSourceGenerateAndRegisterEvent(&pClient->EventSrc, &pEvent);
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263 | if (RT_SUCCESS(rc))
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264 | {
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265 | rc = ShClX11ReadDataFromX11Async(&pClient->State.pCtx->X11, uFormat, cbData, pEvent);
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266 | if (RT_SUCCESS(rc))
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267 | {
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268 | PSHCLEVENTPAYLOAD pPayload;
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269 | rc = ShClEventWait(pEvent, SHCL_TIMEOUT_DEFAULT_MS, &pPayload);
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270 | if (RT_SUCCESS(rc))
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271 | {
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272 | if (pPayload)
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273 | {
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274 | Assert(pPayload->cbData == sizeof(SHCLX11RESPONSE));
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275 | PSHCLX11RESPONSE pResp = (PSHCLX11RESPONSE)pPayload->pvData;
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276 |
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277 | size_t const cbToCopy = RT_MIN(cbData, pPayload->cbData);
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278 | if (cbToCopy) /* memcpy doesn't like 0 byte inputs. */
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279 | memcpy(pvData, pResp->Read.pvData, RT_MIN(cbData, pPayload->cbData));
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280 |
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281 | LogRel2(("Shared Clipboard: Read %RU32 bytes host X11 clipboard data\n", pResp->Read.cbData));
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282 |
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283 | *pcbActual = pResp->Read.cbData;
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284 |
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285 | RTMemFree(pResp->Read.pvData);
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286 | pResp->Read.cbData = 0;
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287 |
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288 | ShClPayloadFree(pPayload);
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289 | }
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290 | else /* No payload given; could happen on invalid / not-expected formats. */
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291 | *pcbActual = 0;
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292 | }
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293 | }
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294 |
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295 | ShClEventRelease(pEvent);
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296 | }
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297 |
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298 | if (RT_FAILURE(rc))
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299 | LogRel(("Shared Clipboard: Error reading host clipboard data from X11, rc=%Rrc\n", rc));
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300 |
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301 | LogFlowFuncLeaveRC(rc);
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302 | return rc;
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303 | }
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304 |
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305 | int ShClBackendWriteData(PSHCLBACKEND pBackend, PSHCLCLIENT pClient, PSHCLCLIENTCMDCTX pCmdCtx,
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306 | SHCLFORMAT uFormat, void *pvData, uint32_t cbData)
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307 | {
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308 | RT_NOREF(pBackend, pClient, pCmdCtx, uFormat, pvData, cbData);
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309 |
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310 | LogFlowFuncEnter();
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311 |
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312 | /* Nothing to do here yet. */
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313 |
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314 | LogFlowFuncLeave();
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315 | return VINF_SUCCESS;
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316 | }
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317 |
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318 | /**
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319 | * @copydoc SHCLCALLBACKS::pfnReportFormats
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320 | *
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321 | * Reports clipboard formats to the guest.
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322 | */
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323 | static DECLCALLBACK(int) shClSvcX11ReportFormatsCallback(PSHCLCONTEXT pCtx, uint32_t fFormats, void *pvUser)
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324 | {
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325 | RT_NOREF(pvUser);
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326 |
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327 | LogFlowFunc(("pCtx=%p, fFormats=%#x\n", pCtx, fFormats));
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328 |
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329 | int rc = VINF_SUCCESS;
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330 | PSHCLCLIENT pClient = pCtx->pClient;
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331 | AssertPtr(pClient);
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332 |
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333 | rc = RTCritSectEnter(&pClient->CritSect);
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334 | if (RT_SUCCESS(rc))
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335 | {
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336 | if (ShClSvcIsBackendActive())
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337 | {
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338 | /** @todo r=bird: BUGBUG: Revisit this */
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339 | if (fFormats != VBOX_SHCL_FMT_NONE) /* No formats to report? */
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340 | {
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341 | rc = ShClSvcHostReportFormats(pCtx->pClient, fFormats);
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342 | }
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343 | }
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344 |
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345 | RTCritSectLeave(&pClient->CritSect);
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346 | }
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347 |
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348 | LogFlowFuncLeaveRC(rc);
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349 | return rc;
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350 | }
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351 |
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352 | /**
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353 | * @copydoc SHCLCALLBACKS::pfnOnRequestDataFromSource
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354 | *
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355 | * Requests clipboard data from the guest.
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356 | *
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357 | * @thread Called from X11 event thread.
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358 | */
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359 | static DECLCALLBACK(int) shClSvcX11RequestDataFromSourceCallback(PSHCLCONTEXT pCtx,
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360 | SHCLFORMAT uFmt, void **ppv, uint32_t *pcb, void *pvUser)
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361 | {
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362 | RT_NOREF(pvUser);
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363 |
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364 | LogFlowFunc(("pCtx=%p, uFmt=0x%x\n", pCtx, uFmt));
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365 |
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366 | if (pCtx->fShuttingDown)
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367 | {
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368 | /* The shared clipboard is disconnecting. */
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369 | LogRel(("Shared Clipboard: Host requested guest clipboard data after guest had disconnected\n"));
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370 | return VERR_WRONG_ORDER;
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371 | }
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372 |
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373 | int rc = VINF_SUCCESS;
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374 |
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375 | #ifdef VBOX_WITH_SHARED_CLIPBOARD_TRANSFERS_HTTP
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376 | /*
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377 | * Note: We always return a generic URI list here.
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378 | * As we don't know which Atom target format was requested by the caller, the X11 clipboard codes needs
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379 | * to decide & transform the list into the actual clipboard Atom target format the caller wanted.
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380 | */
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381 | if (uFmt == VBOX_SHCL_FMT_URI_LIST)
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382 | {
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383 | PSHCLTRANSFER pTransfer = ShClTransferHttpServerGetTransferFirst(&pCtx->X11.HttpCtx.HttpServer);
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384 | if (pTransfer)
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385 | {
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386 | if (RT_SUCCESS(rc))
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387 | rc = ShClTransferRootListRead(pTransfer);
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388 | }
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389 |
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390 | /** @todo BUGBUG IMPLEMENT THIS! */
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391 |
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392 | *ppv = NULL;
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393 | *pcb = 0;
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394 |
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395 | rc = VERR_NO_DATA;
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396 | }
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397 | #endif
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398 |
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399 | if (RT_SUCCESS(rc))
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400 | {
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401 | /* Request data from the guest and for data to arrive. */
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402 | PSHCLEVENT pEvent;
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403 | rc = ShClSvcReadDataFromGuestAsync(pCtx->pClient, uFmt, &pEvent);
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404 | if (RT_SUCCESS(rc))
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405 | {
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406 | PSHCLEVENTPAYLOAD pPayload;
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407 | rc = ShClEventWait(pEvent, SHCL_TIMEOUT_DEFAULT_MS, &pPayload);
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408 | if (RT_SUCCESS(rc))
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409 | {
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410 | if ( !pPayload
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411 | || !pPayload->cbData)
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412 | {
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413 | rc = VERR_NO_DATA;
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414 | }
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415 | else
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416 | {
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417 | *ppv = pPayload->pvData;
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418 | *pcb = pPayload->cbData;
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419 | }
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420 | }
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421 |
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422 | ShClEventRelease(pEvent);
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423 | }
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424 | }
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425 |
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426 | if (RT_FAILURE(rc))
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427 | LogRel(("Shared Clipboard: Requesting data in format %#x for X11 host failed with %Rrc\n", uFmt, rc));
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428 |
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429 | LogFlowFuncLeaveRC(rc);
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430 | return rc;
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431 | }
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432 |
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433 | #ifdef VBOX_WITH_SHARED_CLIPBOARD_TRANSFERS
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434 |
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435 | int ShClBackendTransferCreate(PSHCLBACKEND pBackend, PSHCLCLIENT pClient, PSHCLTRANSFER pTransfer)
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436 | {
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437 | RT_NOREF(pBackend);
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438 | #ifdef VBOX_WITH_SHARED_CLIPBOARD_TRANSFERS_HTTP
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439 | /* We only need to start the HTTP server (and register the transfer to it) when we actually receive data from the guest. */
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440 | if (ShClTransferGetDir(pTransfer) == SHCLTRANSFERDIR_FROM_REMOTE)
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441 | return ShClTransferHttpServerMaybeStart(&pClient->State.pCtx->X11.HttpCtx);
|
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442 | #else
|
---|
443 | RT_NOREF(pClient, pTransfer);
|
---|
444 | #endif
|
---|
445 | return VINF_SUCCESS;
|
---|
446 | }
|
---|
447 |
|
---|
448 | int ShClBackendTransferDestroy(PSHCLBACKEND pBackend, PSHCLCLIENT pClient, PSHCLTRANSFER pTransfer)
|
---|
449 | {
|
---|
450 | RT_NOREF(pBackend);
|
---|
451 | #ifdef VBOX_WITH_SHARED_CLIPBOARD_TRANSFERS_HTTP
|
---|
452 | /* See comment in ShClBackendTransferCreate(). */
|
---|
453 | if (ShClTransferGetDir(pTransfer) == SHCLTRANSFERDIR_FROM_REMOTE)
|
---|
454 | return ShClTransferHttpServerMaybeStop(&pClient->State.pCtx->X11.HttpCtx);
|
---|
455 | #else
|
---|
456 | RT_NOREF(pClient, pTransfer);
|
---|
457 | #endif
|
---|
458 | return VINF_SUCCESS;
|
---|
459 | }
|
---|
460 |
|
---|
461 | int ShClBackendTransferGetRoots(PSHCLBACKEND pBackend, PSHCLCLIENT pClient, PSHCLTRANSFER pTransfer)
|
---|
462 | {
|
---|
463 | RT_NOREF(pBackend);
|
---|
464 |
|
---|
465 | LogFlowFuncEnter();
|
---|
466 |
|
---|
467 | PSHCLEVENT pEvent;
|
---|
468 | int rc = ShClEventSourceGenerateAndRegisterEvent(&pClient->EventSrc, &pEvent);
|
---|
469 | if (RT_SUCCESS(rc))
|
---|
470 | {
|
---|
471 | rc = ShClX11ReadDataFromX11Async(&pClient->State.pCtx->X11, VBOX_SHCL_FMT_URI_LIST, UINT32_MAX, pEvent);
|
---|
472 | if (RT_SUCCESS(rc))
|
---|
473 | {
|
---|
474 | /* X supplies the data asynchronously, so we need to wait for data to arrive first. */
|
---|
475 | PSHCLEVENTPAYLOAD pPayload;
|
---|
476 | rc = ShClEventWait(pEvent, SHCL_TIMEOUT_DEFAULT_MS, &pPayload);
|
---|
477 | if (RT_SUCCESS(rc))
|
---|
478 | {
|
---|
479 | if (pPayload)
|
---|
480 | {
|
---|
481 | Assert(pPayload->cbData == sizeof(SHCLX11RESPONSE));
|
---|
482 | AssertPtr(pPayload->pvData);
|
---|
483 | PSHCLX11RESPONSE pResp = (PSHCLX11RESPONSE)pPayload->pvData;
|
---|
484 |
|
---|
485 | rc = ShClTransferRootsInitFromStringList(pTransfer,
|
---|
486 | (char *)pResp->Read.pvData, pResp->Read.cbData + 1 /* Include zero terminator */);
|
---|
487 | if (RT_SUCCESS(rc))
|
---|
488 | rc = ShClTransferRootListRead(pTransfer);
|
---|
489 |
|
---|
490 | if (RT_SUCCESS(rc))
|
---|
491 | LogRel2(("Shared Clipboard: Host reported %RU64 X11 root entries for transfer to guest\n", ShClTransferRootsCount(pTransfer)));
|
---|
492 |
|
---|
493 | RTMemFree(pResp->Read.pvData);
|
---|
494 | pResp->Read.cbData = 0;
|
---|
495 |
|
---|
496 | ShClPayloadFree(pPayload);
|
---|
497 | pPayload = NULL;
|
---|
498 | }
|
---|
499 | else
|
---|
500 | rc = VERR_NO_DATA; /* No payload. */
|
---|
501 | }
|
---|
502 | }
|
---|
503 |
|
---|
504 | ShClEventRelease(pEvent);
|
---|
505 | }
|
---|
506 | else
|
---|
507 | rc = VERR_SHCLPB_MAX_EVENTS_REACHED;
|
---|
508 |
|
---|
509 | LogFlowFuncLeaveRC(rc);
|
---|
510 | return rc;
|
---|
511 | }
|
---|
512 | #endif /* VBOX_WITH_SHARED_CLIPBOARD_TRANSFERS */
|
---|
513 |
|
---|