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-rw-r--r--toolkit/components/remote/nsXRemoteClient.cpp653
1 files changed, 653 insertions, 0 deletions
diff --git a/toolkit/components/remote/nsXRemoteClient.cpp b/toolkit/components/remote/nsXRemoteClient.cpp
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index 0000000000..198f7f70c2
--- /dev/null
+++ b/toolkit/components/remote/nsXRemoteClient.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:expandtab:shiftwidth=2:tabstop=8:
+ */
+/* vim:set ts=8 sw=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsDebug.h"
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/IntegerPrintfMacros.h"
+#include "mozilla/Sprintf.h"
+#include "mozilla/Unused.h"
+#include "nsXRemoteClient.h"
+#include "RemoteUtils.h"
+#include "prsystem.h"
+#include "mozilla/Logging.h"
+#include "prenv.h"
+#include "prdtoa.h"
+#include <X11/Xatom.h>
+#include <limits.h>
+#include <poll.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#define MOZILLA_VERSION_PROP "_MOZILLA_VERSION"
+#define MOZILLA_LOCK_PROP "_MOZILLA_LOCK"
+#define MOZILLA_COMMANDLINE_PROP "_MOZILLA_COMMANDLINE"
+#define MOZILLA_RESPONSE_PROP "_MOZILLA_RESPONSE"
+#define MOZILLA_USER_PROP "_MOZILLA_USER"
+#define MOZILLA_PROFILE_PROP "_MOZILLA_PROFILE"
+#define MOZILLA_PROGRAM_PROP "_MOZILLA_PROGRAM"
+
+#ifdef IS_BIG_ENDIAN
+# define TO_LITTLE_ENDIAN32(x) \
+ ((((x)&0xff000000) >> 24) | (((x)&0x00ff0000) >> 8) | \
+ (((x)&0x0000ff00) << 8) | (((x)&0x000000ff) << 24))
+#else
+# define TO_LITTLE_ENDIAN32(x) (x)
+#endif
+
+#ifndef MAX_PATH
+# ifdef PATH_MAX
+# define MAX_PATH PATH_MAX
+# else
+# define MAX_PATH 1024
+# endif
+#endif
+
+using mozilla::LogLevel;
+using mozilla::Unused;
+
+static mozilla::LazyLogModule sRemoteLm("nsXRemoteClient");
+
+static int (*sOldHandler)(Display*, XErrorEvent*);
+static bool sGotBadWindow;
+
+nsXRemoteClient::nsXRemoteClient() {
+ mDisplay = 0;
+ mInitialized = false;
+ mMozVersionAtom = 0;
+ mMozLockAtom = 0;
+ mMozCommandLineAtom = 0;
+ mMozResponseAtom = 0;
+ mMozWMStateAtom = 0;
+ mMozUserAtom = 0;
+ mMozProfileAtom = 0;
+ mMozProgramAtom = 0;
+ mLockData = 0;
+ MOZ_LOG(sRemoteLm, LogLevel::Debug, ("nsXRemoteClient::nsXRemoteClient"));
+}
+
+nsXRemoteClient::~nsXRemoteClient() {
+ MOZ_LOG(sRemoteLm, LogLevel::Debug, ("nsXRemoteClient::~nsXRemoteClient"));
+ if (mInitialized) Shutdown();
+}
+
+// Minimize the roundtrips to the X-server
+static const char* XAtomNames[] = {
+ MOZILLA_VERSION_PROP, MOZILLA_LOCK_PROP, MOZILLA_RESPONSE_PROP,
+ "WM_STATE", MOZILLA_USER_PROP, MOZILLA_PROFILE_PROP,
+ MOZILLA_PROGRAM_PROP, MOZILLA_COMMANDLINE_PROP};
+static Atom XAtoms[MOZ_ARRAY_LENGTH(XAtomNames)];
+
+nsresult nsXRemoteClient::Init() {
+ MOZ_LOG(sRemoteLm, LogLevel::Debug, ("nsXRemoteClient::Init"));
+
+ if (mInitialized) return NS_OK;
+
+ // try to open the display
+ mDisplay = XOpenDisplay(0);
+ if (!mDisplay) return NS_ERROR_FAILURE;
+
+ // get our atoms
+ XInternAtoms(mDisplay, const_cast<char**>(XAtomNames),
+ MOZ_ARRAY_LENGTH(XAtomNames), False, XAtoms);
+
+ int i = 0;
+ mMozVersionAtom = XAtoms[i++];
+ mMozLockAtom = XAtoms[i++];
+ mMozResponseAtom = XAtoms[i++];
+ mMozWMStateAtom = XAtoms[i++];
+ mMozUserAtom = XAtoms[i++];
+ mMozProfileAtom = XAtoms[i++];
+ mMozProgramAtom = XAtoms[i++];
+ mMozCommandLineAtom = XAtoms[i];
+
+ mInitialized = true;
+
+ return NS_OK;
+}
+
+void nsXRemoteClient::Shutdown(void) {
+ MOZ_LOG(sRemoteLm, LogLevel::Debug, ("nsXRemoteClient::Shutdown"));
+
+ if (!mInitialized) return;
+
+ // shut everything down
+ XCloseDisplay(mDisplay);
+ mDisplay = 0;
+ mInitialized = false;
+ if (mLockData) {
+ free(mLockData);
+ mLockData = 0;
+ }
+}
+
+static int HandleBadWindow(Display* display, XErrorEvent* event) {
+ if (event->error_code == BadWindow) {
+ sGotBadWindow = true;
+ return 0; // ignored
+ }
+
+ return (*sOldHandler)(display, event);
+}
+
+nsresult nsXRemoteClient::SendCommandLine(
+ const char* aProgram, const char* aProfile, int32_t argc, char** argv,
+ const char* aStartupToken, char** aResponse, bool* aWindowFound) {
+ NS_ENSURE_TRUE(aProgram, NS_ERROR_INVALID_ARG);
+
+ MOZ_LOG(sRemoteLm, LogLevel::Debug, ("nsXRemoteClient::SendCommandLine"));
+
+ *aWindowFound = false;
+
+ // FindBestWindow() iterates down the window hierarchy, so catch X errors
+ // when windows get destroyed before being accessed.
+ sOldHandler = XSetErrorHandler(HandleBadWindow);
+
+ Window w = FindBestWindow(aProgram, aProfile);
+
+ nsresult rv = NS_OK;
+
+ if (w) {
+ // ok, let the caller know that we at least found a window.
+ *aWindowFound = true;
+
+ // Ignore BadWindow errors up to this point. The last request from
+ // FindBestWindow() was a synchronous XGetWindowProperty(), so no need to
+ // Sync. Leave the error handler installed to detect if w gets destroyed.
+ sGotBadWindow = false;
+
+ // make sure we get the right events on that window
+ XSelectInput(mDisplay, w, (PropertyChangeMask | StructureNotifyMask));
+
+ bool destroyed = false;
+
+ // get the lock on the window
+ rv = GetLock(w, &destroyed);
+
+ if (NS_SUCCEEDED(rv)) {
+ // send our command
+ rv = DoSendCommandLine(w, argc, argv, aStartupToken, aResponse,
+ &destroyed);
+
+ // if the window was destroyed, don't bother trying to free the
+ // lock.
+ if (!destroyed) FreeLock(w); // doesn't really matter what this returns
+ }
+ }
+
+ XSetErrorHandler(sOldHandler);
+
+ MOZ_LOG(sRemoteLm, LogLevel::Debug,
+ ("SendCommandInternal returning 0x%" PRIx32 "\n",
+ static_cast<uint32_t>(rv)));
+
+ return rv;
+}
+
+Window nsXRemoteClient::CheckWindow(Window aWindow) {
+ Atom type = None;
+ int format;
+ unsigned long nitems, bytesafter;
+ unsigned char* data;
+ Window innerWindow;
+
+ XGetWindowProperty(mDisplay, aWindow, mMozWMStateAtom, 0, 0, False,
+ AnyPropertyType, &type, &format, &nitems, &bytesafter,
+ &data);
+
+ if (type) {
+ XFree(data);
+ return aWindow;
+ }
+
+ // didn't find it here so check the children of this window
+ innerWindow = CheckChildren(aWindow);
+
+ if (innerWindow) return innerWindow;
+
+ return aWindow;
+}
+
+Window nsXRemoteClient::CheckChildren(Window aWindow) {
+ Window root, parent;
+ Window* children;
+ unsigned int nchildren;
+ unsigned int i;
+ Atom type = None;
+ int format;
+ unsigned long nitems, after;
+ unsigned char* data;
+ Window retval = None;
+
+ if (!XQueryTree(mDisplay, aWindow, &root, &parent, &children, &nchildren))
+ return None;
+
+ // scan the list first before recursing into the list of windows
+ // which can get quite deep.
+ for (i = 0; !retval && (i < nchildren); i++) {
+ XGetWindowProperty(mDisplay, children[i], mMozWMStateAtom, 0, 0, False,
+ AnyPropertyType, &type, &format, &nitems, &after, &data);
+ if (type) {
+ XFree(data);
+ retval = children[i];
+ }
+ }
+
+ // otherwise recurse into the list
+ for (i = 0; !retval && (i < nchildren); i++) {
+ retval = CheckChildren(children[i]);
+ }
+
+ if (children) XFree((char*)children);
+
+ return retval;
+}
+
+nsresult nsXRemoteClient::GetLock(Window aWindow, bool* aDestroyed) {
+ bool locked = false;
+ bool waited = false;
+ *aDestroyed = false;
+
+ nsresult rv = NS_OK;
+
+ if (!mLockData) {
+ char pidstr[32];
+ char sysinfobuf[SYS_INFO_BUFFER_LENGTH];
+ SprintfLiteral(pidstr, "pid%d@", getpid());
+ PRStatus status;
+ status =
+ PR_GetSystemInfo(PR_SI_HOSTNAME, sysinfobuf, SYS_INFO_BUFFER_LENGTH);
+ if (status != PR_SUCCESS) {
+ return NS_ERROR_FAILURE;
+ }
+
+ // allocate enough space for the string plus the terminating
+ // char
+ mLockData = (char*)malloc(strlen(pidstr) + strlen(sysinfobuf) + 1);
+ if (!mLockData) return NS_ERROR_OUT_OF_MEMORY;
+
+ strcpy(mLockData, pidstr);
+ if (!strcat(mLockData, sysinfobuf)) return NS_ERROR_FAILURE;
+ }
+
+ do {
+ int result;
+ Atom actual_type;
+ int actual_format;
+ unsigned long nitems, bytes_after;
+ unsigned char* data = 0;
+
+ XGrabServer(mDisplay);
+
+ result = XGetWindowProperty(
+ mDisplay, aWindow, mMozLockAtom, 0, (65536 / sizeof(long)),
+ False, /* don't delete */
+ XA_STRING, &actual_type, &actual_format, &nitems, &bytes_after, &data);
+
+ // aWindow may have been destroyed before XSelectInput was processed, in
+ // which case there may not be any DestroyNotify event in the queue to
+ // tell us. XGetWindowProperty() was synchronous so error responses have
+ // now been processed, setting sGotBadWindow.
+ if (sGotBadWindow) {
+ *aDestroyed = true;
+ rv = NS_ERROR_FAILURE;
+ } else if (result != Success || actual_type == None) {
+ /* It's not now locked - lock it. */
+ XChangeProperty(mDisplay, aWindow, mMozLockAtom, XA_STRING, 8,
+ PropModeReplace, (unsigned char*)mLockData,
+ strlen(mLockData));
+ locked = True;
+ }
+
+ XUngrabServer(mDisplay);
+ XFlush(mDisplay); // ungrab now!
+
+ if (!locked && !NS_FAILED(rv)) {
+ /* We tried to grab the lock this time, and failed because someone
+ else is holding it already. So, wait for a PropertyDelete event
+ to come in, and try again. */
+ MOZ_LOG(sRemoteLm, LogLevel::Debug,
+ ("window 0x%x is locked by %s; waiting...\n",
+ (unsigned int)aWindow, data));
+ waited = True;
+ while (true) {
+ XEvent event;
+ int poll_retval;
+ struct pollfd pfd;
+
+ pfd.fd = ConnectionNumber(mDisplay);
+ pfd.events = POLLIN;
+
+ poll_retval = poll(&pfd, 1, 10 * 1000);
+ // did we time out?
+ if (poll_retval == 0) {
+ MOZ_LOG(sRemoteLm, LogLevel::Debug,
+ ("timed out waiting for window\n"));
+ rv = NS_ERROR_FAILURE;
+ break;
+ }
+ MOZ_LOG(sRemoteLm, LogLevel::Debug, ("xevent...\n"));
+ // FIXME check the return value from this?
+ XNextEvent(mDisplay, &event);
+ if (event.xany.type == DestroyNotify &&
+ event.xdestroywindow.window == aWindow) {
+ *aDestroyed = true;
+ rv = NS_ERROR_FAILURE;
+ break;
+ }
+ if (event.xany.type == PropertyNotify &&
+ event.xproperty.state == PropertyDelete &&
+ event.xproperty.window == aWindow &&
+ event.xproperty.atom == mMozLockAtom) {
+ /* Ok! Someone deleted their lock, so now we can try
+ again. */
+ MOZ_LOG(
+ sRemoteLm, LogLevel::Debug,
+ ("(0x%x unlocked, trying again...)\n", (unsigned int)aWindow));
+ break;
+ }
+ }
+ }
+ if (data) XFree(data);
+ } while (!locked && !NS_FAILED(rv));
+
+ if (waited && locked) {
+ MOZ_LOG(sRemoteLm, LogLevel::Debug, ("obtained lock.\n"));
+ } else if (*aDestroyed) {
+ MOZ_LOG(sRemoteLm, LogLevel::Debug,
+ ("window 0x%x unexpectedly destroyed.\n", (unsigned int)aWindow));
+ }
+
+ return rv;
+}
+
+Window nsXRemoteClient::FindBestWindow(const char* aProgram,
+ const char* aProfile) {
+ Window root = RootWindowOfScreen(DefaultScreenOfDisplay(mDisplay));
+ Window bestWindow = 0;
+ Window root2, parent, *kids;
+ unsigned int nkids;
+
+ // Get a list of the children of the root window, walk the list
+ // looking for the best window that fits the criteria.
+ if (!XQueryTree(mDisplay, root, &root2, &parent, &kids, &nkids)) {
+ MOZ_LOG(sRemoteLm, LogLevel::Debug,
+ ("XQueryTree failed in nsXRemoteClient::FindBestWindow"));
+ return 0;
+ }
+
+ if (!(kids && nkids)) {
+ MOZ_LOG(sRemoteLm, LogLevel::Debug, ("root window has no children"));
+ return 0;
+ }
+
+ // We'll walk the list of windows looking for a window that best
+ // fits the criteria here.
+
+ for (unsigned int i = 0; i < nkids; i++) {
+ Atom type;
+ int format;
+ unsigned long nitems, bytesafter;
+ unsigned char* data_return = 0;
+ Window w;
+ w = kids[i];
+ // find the inner window with WM_STATE on it
+ w = CheckWindow(w);
+
+ int status = XGetWindowProperty(
+ mDisplay, w, mMozVersionAtom, 0, (65536 / sizeof(long)), False,
+ XA_STRING, &type, &format, &nitems, &bytesafter, &data_return);
+
+ if (!data_return) continue;
+
+ double version = PR_strtod((char*)data_return, nullptr);
+ XFree(data_return);
+
+ if (!(version >= 5.1 && version < 6)) continue;
+
+ data_return = 0;
+
+ if (status != Success || type == None) continue;
+
+ // Check that this window is from the right program.
+ Unused << XGetWindowProperty(
+ mDisplay, w, mMozProgramAtom, 0, (65536 / sizeof(long)), False,
+ XA_STRING, &type, &format, &nitems, &bytesafter, &data_return);
+
+ // If the return name is not the same as this program name, we don't want
+ // this window.
+ if (data_return) {
+ if (strcmp(aProgram, (const char*)data_return)) {
+ XFree(data_return);
+ continue;
+ }
+
+ // This is actually the success condition.
+ XFree(data_return);
+ } else {
+ // Doesn't support the protocol, even though the user
+ // requested it. So we're not going to use this window.
+ continue;
+ }
+
+ // Check to see if it has the user atom on that window. If there
+ // is then we need to make sure that it matches what we have.
+ const char* username = PR_GetEnv("LOGNAME");
+
+ if (username) {
+ Unused << XGetWindowProperty(
+ mDisplay, w, mMozUserAtom, 0, (65536 / sizeof(long)), False,
+ XA_STRING, &type, &format, &nitems, &bytesafter, &data_return);
+
+ // if there's a username compare it with what we have
+ if (data_return) {
+ // If the IDs aren't equal, we don't want this window.
+ if (strcmp(username, (const char*)data_return)) {
+ XFree(data_return);
+ continue;
+ }
+
+ XFree(data_return);
+ }
+ }
+
+ // Check to see if there's a profile name on this window. If
+ // there is, then we need to make sure it matches what someone
+ // passed in.
+ Unused << XGetWindowProperty(
+ mDisplay, w, mMozProfileAtom, 0, (65536 / sizeof(long)), False,
+ XA_STRING, &type, &format, &nitems, &bytesafter, &data_return);
+
+ // If there's a profile compare it with what we have
+ if (data_return) {
+ // If the profiles aren't equal, we don't want this window.
+ if (strcmp(aProfile, (const char*)data_return)) {
+ XFree(data_return);
+ continue;
+ }
+
+ XFree(data_return);
+ } else {
+ // This isn't the window for this profile.
+ continue;
+ }
+
+ // Check to see if the window supports the new command-line passing
+ // protocol, if that is requested.
+
+ // If we got this far, this is the best window. It passed
+ // all the tests.
+ bestWindow = w;
+ break;
+ }
+
+ if (kids) XFree((char*)kids);
+
+ return bestWindow;
+}
+
+nsresult nsXRemoteClient::FreeLock(Window aWindow) {
+ int result;
+ Atom actual_type;
+ int actual_format;
+ unsigned long nitems, bytes_after;
+ unsigned char* data = 0;
+
+ result = XGetWindowProperty(
+ mDisplay, aWindow, mMozLockAtom, 0, (65536 / sizeof(long)),
+ True, /* atomic delete after */
+ XA_STRING, &actual_type, &actual_format, &nitems, &bytes_after, &data);
+ if (result != Success) {
+ MOZ_LOG(sRemoteLm, LogLevel::Debug,
+ ("unable to read and delete " MOZILLA_LOCK_PROP " property\n"));
+ return NS_ERROR_FAILURE;
+ }
+ if (!data || !*data) {
+ MOZ_LOG(sRemoteLm, LogLevel::Debug,
+ ("invalid data on " MOZILLA_LOCK_PROP " of window 0x%x.\n",
+ (unsigned int)aWindow));
+ return NS_ERROR_FAILURE;
+ } else if (strcmp((char*)data, mLockData)) {
+ MOZ_LOG(sRemoteLm, LogLevel::Debug,
+ (MOZILLA_LOCK_PROP " was stolen! Expected \"%s\", saw \"%s\"!\n",
+ mLockData, data));
+ return NS_ERROR_FAILURE;
+ }
+
+ if (data) XFree(data);
+ return NS_OK;
+}
+
+nsresult nsXRemoteClient::DoSendCommandLine(Window aWindow, int32_t argc,
+ char** argv,
+ const char* aStartupToken,
+ char** aResponse,
+ bool* aDestroyed) {
+ *aDestroyed = false;
+
+ int commandLineLength;
+ char* commandLine =
+ ConstructCommandLine(argc, argv, aStartupToken, &commandLineLength);
+ XChangeProperty(mDisplay, aWindow, mMozCommandLineAtom, XA_STRING, 8,
+ PropModeReplace, (unsigned char*)commandLine,
+ commandLineLength);
+ free(commandLine);
+
+ if (!WaitForResponse(aWindow, aResponse, aDestroyed, mMozCommandLineAtom))
+ return NS_ERROR_FAILURE;
+
+ return NS_OK;
+}
+
+bool nsXRemoteClient::WaitForResponse(Window aWindow, char** aResponse,
+ bool* aDestroyed, Atom aCommandAtom) {
+ bool done = false;
+ bool accepted = false;
+
+ while (!done) {
+ XEvent event;
+ XNextEvent(mDisplay, &event);
+ if (event.xany.type == DestroyNotify &&
+ event.xdestroywindow.window == aWindow) {
+ /* Print to warn user...*/
+ MOZ_LOG(sRemoteLm, LogLevel::Debug,
+ ("window 0x%x was destroyed.\n", (unsigned int)aWindow));
+ *aResponse = strdup("Window was destroyed while reading response.");
+ *aDestroyed = true;
+ return false;
+ }
+ if (event.xany.type == PropertyNotify &&
+ event.xproperty.state == PropertyNewValue &&
+ event.xproperty.window == aWindow &&
+ event.xproperty.atom == mMozResponseAtom) {
+ Atom actual_type;
+ int actual_format;
+ unsigned long nitems, bytes_after;
+ unsigned char* data = 0;
+ Bool result;
+ result = XGetWindowProperty(mDisplay, aWindow, mMozResponseAtom, 0,
+ (65536 / sizeof(long)),
+ True, /* atomic delete after */
+ XA_STRING, &actual_type, &actual_format,
+ &nitems, &bytes_after, &data);
+ if (result != Success) {
+ MOZ_LOG(
+ sRemoteLm, LogLevel::Debug,
+ ("failed reading " MOZILLA_RESPONSE_PROP " from window 0x%0x.\n",
+ (unsigned int)aWindow));
+ *aResponse = strdup("Internal error reading response from window.");
+ done = true;
+ } else if (!data || strlen((char*)data) < 5) {
+ MOZ_LOG(sRemoteLm, LogLevel::Debug,
+ ("invalid data on " MOZILLA_RESPONSE_PROP
+ " property of window 0x%0x.\n",
+ (unsigned int)aWindow));
+ *aResponse = strdup("Server returned invalid data in response.");
+ done = true;
+ } else if (*data == '1') { /* positive preliminary reply */
+ MOZ_LOG(sRemoteLm, LogLevel::Debug, ("%s\n", data + 4));
+ /* keep going */
+ done = false;
+ }
+
+ else if (!strncmp((char*)data, "200", 3)) { /* positive completion */
+ *aResponse = strdup((char*)data);
+ accepted = true;
+ done = true;
+ }
+
+ else if (*data == '2') { /* positive completion */
+ MOZ_LOG(sRemoteLm, LogLevel::Debug, ("%s\n", data + 4));
+ *aResponse = strdup((char*)data);
+ accepted = true;
+ done = true;
+ }
+
+ else if (*data == '3') { /* positive intermediate reply */
+ MOZ_LOG(sRemoteLm, LogLevel::Debug,
+ ("internal error: "
+ "server wants more information? (%s)\n",
+ data));
+ *aResponse = strdup((char*)data);
+ done = true;
+ }
+
+ else if (*data == '4' || /* transient negative completion */
+ *data == '5') { /* permanent negative completion */
+ MOZ_LOG(sRemoteLm, LogLevel::Debug, ("%s\n", data + 4));
+ *aResponse = strdup((char*)data);
+ done = true;
+ }
+
+ else {
+ MOZ_LOG(
+ sRemoteLm, LogLevel::Debug,
+ ("unrecognised " MOZILLA_RESPONSE_PROP " from window 0x%x: %s\n",
+ (unsigned int)aWindow, data));
+ *aResponse = strdup((char*)data);
+ done = true;
+ }
+
+ if (data) XFree(data);
+ }
+
+ else if (event.xany.type == PropertyNotify &&
+ event.xproperty.window == aWindow &&
+ event.xproperty.state == PropertyDelete &&
+ event.xproperty.atom == aCommandAtom) {
+ MOZ_LOG(sRemoteLm, LogLevel::Debug,
+ ("(server 0x%x has accepted " MOZILLA_COMMANDLINE_PROP ".)\n",
+ (unsigned int)aWindow));
+ }
+ }
+
+ return accepted;
+}