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83 lines
2.9 KiB
83 lines
2.9 KiB
/* |
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* Copyright (C) 2018 The Android Open Source Project |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#include <string> |
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#include <dlfcn.h> |
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#include <errno.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#define LOG_TAG "Netd" |
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#include <log/log.h> |
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#include <netd_resolv/resolv_stub.h> |
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struct ResolvStub RESOLV_STUB; |
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inline constexpr char APEX_LIB64_DIR[] = "/apex/com.android.resolv/lib64"; |
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inline constexpr char APEX_LIB_DIR[] = "/apex/com.android.resolv/lib"; |
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inline constexpr char LIBNAME[] = "libnetd_resolv.so"; |
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template <typename FunctionType> |
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static void resolvStubInitFunction(void* handle, const char* symbol, FunctionType** stubPtr) { |
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void* f = dlsym(handle, symbol); |
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if (f == nullptr) { |
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ALOGE("Can't find symbol %s in %s", symbol, LIBNAME); |
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abort(); |
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} |
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*stubPtr = reinterpret_cast<FunctionType*>(f); |
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} |
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int resolv_stub_init() { |
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void* netdResolvHandle; |
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for (const auto& dir : {APEX_LIB64_DIR, APEX_LIB_DIR}) { |
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std::string path = std::string(dir) + "/" + LIBNAME; |
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netdResolvHandle = dlopen(path.c_str(), RTLD_NOW); |
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if (netdResolvHandle != nullptr) { |
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ALOGI("Loaded resolver library from %s", path.c_str()); |
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break; |
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} |
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ALOGW("dlopen(%s) failed: %s", path.c_str(), strerror(errno)); |
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} |
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if (netdResolvHandle == nullptr) { |
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ALOGE("Fatal: couldn't open libnetd_resolv"); |
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abort(); |
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} |
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#define STR(x) #x |
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#define RESOLV_STUB_LOAD_SYMBOL(x) resolvStubInitFunction(netdResolvHandle, STR(x), &RESOLV_STUB.x) |
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RESOLV_STUB_LOAD_SYMBOL(resolv_has_nameservers); |
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RESOLV_STUB_LOAD_SYMBOL(resolv_init); |
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#undef RESOLV_STUB_LOAD_SYMBOL |
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#undef STR |
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return 0; |
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}
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