10e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org/* 20e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org * libjingle 30e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org * Copyright 2004 Google Inc. 40e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org * 50e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org * Redistribution and use in source and binary forms, with or without 60e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org * modification, are permitted provided that the following conditions are met: 70e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org * 80e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org * 1. Redistributions of source code must retain the above copyright notice, 90e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org * this list of conditions and the following disclaimer. 100e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org * 2. Redistributions in binary form must reproduce the above copyright notice, 110e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org * this list of conditions and the following disclaimer in the documentation 120e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org * and/or other materials provided with the distribution. 130e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org * 3. The name of the author may not be used to endorse or promote products 140e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org * derived from this software without specific prior written permission. 150e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org * 160e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 170e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 180e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 190e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 200e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 210e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 220e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 230e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 240e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 250e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 260e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org */ 270e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org 280e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org#include "talk/media/devices/libudevsymboltable.h" 290e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org 30861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org#include <dlfcn.h> 31861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org 322a86ce22ccc387dfa6f8a98ce3eba5c1e6f9e538buildbot@webrtc.org#include "webrtc/base/logging.h" 33861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org 340e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.orgnamespace cricket { 350e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org 360e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org#define LATE_BINDING_SYMBOL_TABLE_CLASS_NAME LIBUDEV_SYMBOLS_CLASS_NAME 370e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org#define LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST LIBUDEV_SYMBOLS_LIST 380e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org#define LATE_BINDING_SYMBOL_TABLE_DLL_NAME "libudev.so.0" 392a86ce22ccc387dfa6f8a98ce3eba5c1e6f9e538buildbot@webrtc.org#include "webrtc/base/latebindingsymboltable.cc.def" 400e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org#undef LATE_BINDING_SYMBOL_TABLE_CLASS_NAME 410e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org#undef LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST 420e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org#undef LATE_BINDING_SYMBOL_TABLE_DLL_NAME 430e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org 442a86ce22ccc387dfa6f8a98ce3eba5c1e6f9e538buildbot@webrtc.orgbool IsWrongLibUDevAbiVersion(rtc::DllHandle libudev_0) { 452a86ce22ccc387dfa6f8a98ce3eba5c1e6f9e538buildbot@webrtc.org rtc::DllHandle libudev_1 = dlopen("libudev.so.1", 4619da4659bfe1cd99b6b1476cae9bc74e99e0b09dsergeyu@chromium.org RTLD_NOW|RTLD_LOCAL|RTLD_NOLOAD); 47861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org bool unsafe_symlink = (libudev_0 == libudev_1); 48861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org if (unsafe_symlink) { 49861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org // .0 and .1 are distinct ABIs, so if they point to the same thing then one 50861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org // of them must be wrong. Probably the old has been symlinked to the new in 51861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org // a misguided attempt at backwards compatibility. 52861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org LOG(LS_ERROR) << "libudev.so.0 and libudev.so.1 unsafely point to the" 53861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org " same thing; not using libudev"; 54861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org } else if (libudev_1) { 55861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org // If libudev.so.1 is resident but distinct from libudev.so.0, then some 56861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org // system library loaded the new ABI separately. This is not a problem for 57861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org // LateBindingSymbolTable because its symbol look-ups are restricted to its 58861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org // DllHandle, but having libudev.so.0 resident may cause problems for that 5919da4659bfe1cd99b6b1476cae9bc74e99e0b09dsergeyu@chromium.org // system library because symbol names are not namespaced by DLL. (Although 6019da4659bfe1cd99b6b1476cae9bc74e99e0b09dsergeyu@chromium.org // our use of RTLD_LOCAL should avoid most problems.) 61861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org LOG(LS_WARNING) 62861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org << "libudev.so.1 is resident but distinct from libudev.so.0"; 63861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org } 64861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org if (libudev_1) { 65861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org // Release the refcount that we acquired above. (Does not unload the DLL; 66861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org // whoever loaded it still needs it.) 67861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org dlclose(libudev_1); 68861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org } 69861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org return unsafe_symlink; 70861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org} 71861d07361a4559a72e96236f27b758a56f6f59f0wu@webrtc.org 720e118e7129884fbea117e78d6f2068139a414dbhenrike@webrtc.org} // namespace cricket 73