| 1 | /** @file
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| 2 | *
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| 3 | * VirtualBox Guest Service:
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| 4 | * Linux guest.
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| 5 | */
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| 6 |
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| 7 | /*
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| 8 | * Copyright (C) 2006-2007 innotek GmbH
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| 9 | *
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| 10 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 11 | * available from http://www.virtualbox.org. This file is free software;
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| 12 | * you can redistribute it and/or modify it under the terms of the GNU
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| 13 | * General Public License (GPL) as published by the Free Software
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| 14 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 15 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 16 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 17 | */
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| 18 |
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| 19 | // #define LOG_GROUP LOG_GROUP_DEV_VMM_BACKDOOR
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| 20 |
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| 21 | #include <VBox/VBoxGuest.h>
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| 22 | #include <VBox/log.h>
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| 23 | #include <iprt/initterm.h>
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| 24 | #include <iprt/path.h>
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| 25 |
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| 26 | #include <iostream>
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| 27 | #include <cstdio>
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| 28 |
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| 29 | #include <sys/types.h>
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| 30 | #include <stdlib.h> /* For exit */
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| 31 | #include <unistd.h>
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| 32 | #include <errno.h>
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| 33 | #include <signal.h>
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| 34 |
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| 35 | #include <X11/Xlib.h>
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| 36 | #include <X11/Intrinsic.h>
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| 37 |
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| 38 | #include "clipboard.h"
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| 39 |
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| 40 | #ifdef DYNAMIC_RESIZE
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| 41 | # include "displaychange.h"
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| 42 | # ifdef SEAMLESS_GUEST
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| 43 | # include "seamless.h"
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| 44 | # endif
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| 45 | #endif
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| 46 |
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| 47 | #define TRACE printf("%s: %d\n", __PRETTY_FUNCTION__, __LINE__); Log(("%s: %d\n", __PRETTY_FUNCTION__, __LINE__))
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| 48 |
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| 49 | static int (*gpfnOldIOErrorHandler)(Display *) = NULL;
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| 50 |
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| 51 | /* Make these global so that the destructors are called if we make an "emergency exit",
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| 52 | i.e. a (handled) signal or an X11 error. */
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| 53 | #ifdef DYNAMIC_RESIZE
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| 54 | VBoxGuestDisplayChangeMonitor gDisplayChange;
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| 55 | # ifdef SEAMLESS_GUEST
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| 56 | /** Our instance of the seamless class. This only makes sense if dynamic resizing
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| 57 | is enabled. */
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| 58 | VBoxGuestSeamless gSeamless;
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| 59 | # endif /* SEAMLESS_GUEST defined */
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| 60 | #endif /* DYNAMIC_RESIZE */
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| 61 | #ifdef VBOX_X11_CLIPBOARD
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| 62 | VBoxGuestClipboard gClipboard;
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| 63 | #endif
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| 64 |
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| 65 | /**
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| 66 | * Drop the programmes privileges to the caller's.
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| 67 | * @returns IPRT status code
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| 68 | * @todo move this into the R3 guest library
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| 69 | */
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| 70 | int vboxClientDropPrivileges(void)
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| 71 | {
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| 72 | int rc = VINF_SUCCESS;
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| 73 | int rcSystem, rcErrno;
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| 74 |
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| 75 | #ifdef _POSIX_SAVED_IDS
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| 76 | rcSystem = setuid(getuid());
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| 77 | #else
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| 78 | rcSystem = setreuid(-1, getuid());
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| 79 | #endif
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| 80 | if (rcSystem < 0)
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| 81 | {
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| 82 | rcErrno = errno;
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| 83 | rc = RTErrConvertFromErrno(rcErrno);
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| 84 | LogRel(("VBoxClient: failed to drop privileges, error %Rrc.\n", rc));
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| 85 | }
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| 86 | return rc;
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| 87 | }
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| 88 |
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| 89 | /**
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| 90 | * Xlib error handler for certain errors that we can't avoid.
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| 91 | */
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| 92 | int vboxClientXLibErrorHandler(Display *pDisplay, XErrorEvent *pError)
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| 93 | {
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| 94 | char errorText[1024];
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| 95 |
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| 96 | if (pError->error_code == BadAtom)
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| 97 | {
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| 98 | /* This can be triggered in debug builds if a guest application passes a bad atom
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| 99 | in its list of supported clipboard formats. As such it is harmless. */
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| 100 | Log(("VBoxClient: ignoring BadAtom error and returning\n"));
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| 101 | return 0;
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| 102 | }
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| 103 | if (pError->error_code == BadWindow)
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| 104 | {
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| 105 | /* This can be triggered if a guest application destroys a window before we notice. */
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| 106 | Log(("VBoxClient: ignoring BadWindow error and returning\n"));
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| 107 | return 0;
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| 108 | }
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| 109 | XGetErrorText(pDisplay, pError->error_code, errorText, sizeof(errorText));
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| 110 | LogRel(("VBoxClient: an X Window protocol error occurred: %s (error code %d). Request code: %d, minor code: %d, serial number: %d\n", errorText, pError->error_code, pError->request_code, pError->minor_code, pError->serial));
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| 111 | VbglR3Term();
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| 112 | exit(1);
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| 113 | }
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| 114 |
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| 115 | /**
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| 116 | * Xlib error handler for fatal errors. This often means that the programme is still running
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| 117 | * when X exits.
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| 118 | */
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| 119 | int vboxClientXLibIOErrorHandler(Display *pDisplay)
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| 120 | {
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| 121 | Log(("VBoxClient: a fatal guest X Window error occurred. This may just mean that the Window system was shut down while the client was still running.\n"));
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| 122 | VbglR3Term();
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| 123 | return gpfnOldIOErrorHandler(pDisplay);
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| 124 | }
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| 125 |
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| 126 | /**
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| 127 | * A standard signal handler which cleans up and exits. Our global static objects will
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| 128 | * be cleaned up properly as we exit using "exit".
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| 129 | */
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| 130 | void vboxClientSignalHandler(int cSignal)
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| 131 | {
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| 132 | Log(("VBoxClient: terminated with signal %d\n", cSignal));
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| 133 | /* Our pause() call will now return and exit. */
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| 134 | }
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| 135 |
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| 136 | /**
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| 137 | * Reset all standard termination signals to call our signal handler, which cleans up
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| 138 | * and exits.
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| 139 | */
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| 140 | void vboxClientSetSignalHandlers(void)
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| 141 | {
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| 142 | struct sigaction sigAction = { { 0 } };
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| 143 |
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| 144 | sigAction.sa_handler = vboxClientSignalHandler;
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| 145 | sigemptyset(&sigAction.sa_mask);
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| 146 | sigaction(SIGHUP, &sigAction, NULL);
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| 147 | sigaction(SIGINT, &sigAction, NULL);
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| 148 | sigaction(SIGQUIT, &sigAction, NULL);
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| 149 | sigaction(SIGABRT, &sigAction, NULL);
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| 150 | sigaction(SIGPIPE, &sigAction, NULL);
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| 151 | sigaction(SIGALRM, &sigAction, NULL);
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| 152 | sigaction(SIGTERM, &sigAction, NULL);
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| 153 | sigaction(SIGUSR1, &sigAction, NULL);
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| 154 | sigaction(SIGUSR2, &sigAction, NULL);
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| 155 | }
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| 156 |
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| 157 | /**
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| 158 | * Print out a usage message and exit with success.
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| 159 | */
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| 160 | void vboxClientUsage(const char *pcszFileName)
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| 161 | {
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| 162 | /* printf is better for i18n than iostream. */
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| 163 | printf("Usage: %s [-d|--nodaemon]\n", pcszFileName);
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| 164 | printf("Start the VirtualBox X Window System guest services.\n\n");
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| 165 | printf("Options:\n");
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| 166 | printf(" -d, --nodaemon do not lower privileges and continue running as a system\n");
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| 167 | printf(" service\n");
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| 168 | exit(0);
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| 169 | }
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| 170 |
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| 171 | /**
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| 172 | * The main loop for the VBoxClient daemon.
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| 173 | */
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| 174 | int main(int argc, char *argv[])
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| 175 | {
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| 176 | int rcClipboard, rc = VINF_SUCCESS;
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| 177 | const char *pszFileName = RTPathFilename(argv[0]);
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| 178 | bool fDaemonise = true;
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| 179 |
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| 180 | if (NULL == pszFileName)
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| 181 | pszFileName = "VBoxClient";
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| 182 |
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| 183 | TRACE;
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| 184 | /* Parse our option(s) */
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| 185 | /** @todo Use RTGetOpt() if the arguments become more complex. */
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| 186 | for (int i = 1; i < argc; ++i)
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| 187 | {
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| 188 | if (!strcmp(argv[i], "-d") || !strcmp(argv[i], "--nodaemon"))
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| 189 | fDaemonise = false;
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| 190 | else if (!strcmp(argv[i], "-h") || strcmp(argv[i], "--help"))
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| 191 | {
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| 192 | vboxClientUsage(pszFileName);
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| 193 | exit(0);
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| 194 | }
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| 195 | else
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| 196 | {
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| 197 | /* printf is better than iostream for i18n. */
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| 198 | printf("%s: unrecognized option `%s'\n", pszFileName, argv[i]);
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| 199 | printf("Try `%s --help' for more information\n", pszFileName);
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| 200 | exit(1);
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| 201 | }
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| 202 | }
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| 203 | TRACE;
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| 204 | if (fDaemonise)
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| 205 | {
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| 206 | rc = VbglR3Daemonize(false /* fNoChDir */, false /* fNoClose */);
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| 207 | if (RT_FAILURE(rc))
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| 208 | {
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| 209 | std::cout << "VBoxClient: failed to daemonize. exiting."<< std::endl;
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| 210 | return 1;
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| 211 | }
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| 212 | }
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| 213 | /* Initialise our runtime before all else. */
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| 214 | TRACE;
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| 215 | RTR3Init(false);
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| 216 | if (RT_FAILURE(VbglR3Init()))
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| 217 | {
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| 218 | std::cout << "Failed to connect to the VirtualBox kernel service" << std::endl;
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| 219 | return 1;
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| 220 | }
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| 221 | TRACE;
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| 222 | if (fDaemonise && RT_FAILURE(vboxClientDropPrivileges()))
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| 223 | return 1;
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| 224 | LogRel(("VBoxClient: starting...\n"));
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| 225 | /* Initialise threading in X11 and in Xt. */
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| 226 | if (!XInitThreads() || !XtToolkitThreadInitialize())
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| 227 | {
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| 228 | LogRel(("VBoxClient: error initialising threads in X11, exiting."));
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| 229 | return 1;
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| 230 | }
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| 231 | /* Set an X11 error handler, so that we don't die when we get unavoidable errors. */
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| 232 | XSetErrorHandler(vboxClientXLibErrorHandler);
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| 233 | /* Set an X11 I/O error handler, so that we can shutdown properly on fatal errors. */
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| 234 | gpfnOldIOErrorHandler = XSetIOErrorHandler(vboxClientXLibIOErrorHandler);
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| 235 | vboxClientSetSignalHandlers();
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| 236 | try
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| 237 | {
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| 238 | #ifdef VBOX_X11_CLIPBOARD
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| 239 | /* Connect to the host clipboard. */
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| 240 | LogRel(("VBoxClient: starting clipboard Guest Additions...\n"));
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| 241 | rcClipboard = gClipboard.init();
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| 242 | if (RT_FAILURE(rcClipboard))
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| 243 | {
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| 244 | LogRel(("VBoxClient: vboxClipboardConnect failed with rc = %Rrc\n", rc));
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| 245 | }
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| 246 | #endif /* VBOX_X11_CLIPBOARD defined */
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| 247 | #ifdef DYNAMIC_RESIZE
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| 248 | LogRel(("VBoxClient: starting dynamic guest resizing...\n"));
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| 249 | rc = gDisplayChange.init();
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| 250 | if (RT_FAILURE(rc))
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| 251 | {
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| 252 | LogRel(("VBoxClient: failed to start dynamic guest resizing, rc = %Rrc\n", rc));
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| 253 | }
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| 254 | # ifdef SEAMLESS_GUEST
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| 255 | if (RT_SUCCESS(rc))
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| 256 | {
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| 257 | LogRel(("VBoxClient: starting seamless Guest Additions...\n"));
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| 258 | rc = gSeamless.init();
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| 259 | if (RT_FAILURE(rc))
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| 260 | {
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| 261 | LogRel(("VBoxClient: failed to start seamless Additions, rc = %Rrc\n", rc));
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| 262 | }
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| 263 | }
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| 264 | # endif /* SEAMLESS_GUEST defined */
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| 265 | #endif /* DYNAMIC_RESIZE defined */
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| 266 | }
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| 267 | catch (std::exception e)
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| 268 | {
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| 269 | LogRel(("VBoxClient: failed to initialise Guest Additions - caught exception: %s\n", e.what()));
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| 270 | rc = VERR_UNRESOLVED_ERROR;
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| 271 | }
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| 272 | catch (...)
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| 273 | {
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| 274 | LogRel(("VBoxClient: failed to initialise Guest Additions - caught unknown exception.\n"));
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| 275 | rc = VERR_UNRESOLVED_ERROR;
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| 276 | }
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| 277 | LogRel(("VBoxClient: sleeping...\n"));
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| 278 | pause();
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| 279 | LogRel(("VBoxClient: exiting...\n"));
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| 280 | try
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| 281 | {
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| 282 | #ifdef DYNAMIC_RESIZE
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| 283 | # ifdef SEAMLESS_GUEST
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| 284 | LogRel(("VBoxClient: shutting down seamless Guest Additions...\n"));
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| 285 | gSeamless.uninit(2000);
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| 286 | # endif /* SEAMLESS_GUEST defined */
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| 287 | LogRel(("VBoxClient: shutting down dynamic guest resizing...\n"));
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| 288 | gDisplayChange.uninit(2000);
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| 289 | #endif /* DYNAMIC_RESIZE defined */
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| 290 | #ifdef VBOX_X11_CLIPBOARD
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| 291 | /* Connect to the host clipboard. */
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| 292 | LogRel(("VBoxClient: shutting down clipboard Guest Additions...\n"));
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| 293 | gClipboard.uninit(2000);
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| 294 | #endif /* VBOX_X11_CLIPBOARD defined */
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| 295 | }
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| 296 | catch (std::exception e)
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| 297 | {
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| 298 | LogRel(("VBoxClient: failed to shut down Guest Additions - caught exception: %s\n", e.what()));
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| 299 | rc = VERR_UNRESOLVED_ERROR;
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| 300 | }
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| 301 | catch (...)
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| 302 | {
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| 303 | LogRel(("VBoxClient: failed to shut down Guest Additions - caught unknown exception.\n"));
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| 304 | rc = VERR_UNRESOLVED_ERROR;
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| 305 | }
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| 306 | VbglR3Term();
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| 307 | return RT_SUCCESS(rc) ? 0 : 1;
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| 308 | }
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