/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <string>
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#define LOG_TAG "OemIptablesHook"
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#include <log/log.h>
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#include <logwrap/logwrap.h>
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#include "NetdConstants.h"
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namespace {
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const char OEM_SCRIPT_PATH[] = "/system/bin/oem-iptables-init.sh";
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bool oemCleanupHooks() {
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static const std::string cmd4 =
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"*filter\n"
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":oem_out -\n"
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":oem_fwd -\n"
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"COMMIT\n"
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"*nat\n"
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":oem_nat_pre -\n"
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"COMMIT\n";
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static const std::string cmd6 =
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"*filter\n"
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":oem_out -\n"
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":oem_fwd -\n"
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"COMMIT\n";
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return (execIptablesRestore(V4, cmd4) == 0 && execIptablesRestore(V6, cmd6) == 0);
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}
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bool oemInitChains() {
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int ret = system(OEM_SCRIPT_PATH); // NOLINT(cert-env33-c)
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if ((-1 == ret) || (0 != WEXITSTATUS(ret))) {
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ALOGE("%s failed: %s", OEM_SCRIPT_PATH, strerror(errno));
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oemCleanupHooks();
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return false;
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}
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return true;
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}
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} // namespace
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void setupOemIptablesHook() {
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if (0 == access(OEM_SCRIPT_PATH, R_OK | X_OK)) {
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// The call to oemCleanupHooks() is superfluous when done on bootup,
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// but is needed for the case where netd has crashed/stopped and is
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// restarted.
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if (oemCleanupHooks() && oemInitChains()) {
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ALOGI("OEM iptable hook installed.");
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}
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}
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}
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