blob: fbf14f88605a50a380f098957770d28da5948308 [file] [log] [blame]
/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#define LOG_TAG "OemIptablesHook"
#include <cutils/log.h>
#include "NetdConstants.h"
extern "C" int system_nosh(const char *command);
static int runIptablesCmd(const char *cmd) {
char *buffer;
size_t len = strnlen(cmd, 255);
int res;
if (len == 255) {
ALOGE("command too long");
return -1;
}
asprintf(&buffer, "%s %s", IPTABLES_PATH, cmd);
res = system_nosh(buffer);
free(buffer);
return res;
}
static bool oemCleanupHooks() {
runIptablesCmd("-F oem_out");
runIptablesCmd("-F oem_fwd");
runIptablesCmd("-t nat -F oem_nat_pre");
return true;
}
static bool oemInitChains() {
int ret = system(OEM_SCRIPT_PATH);
if ((-1 == ret) || (0 != WEXITSTATUS(ret))) {
ALOGE("%s failed: %s", OEM_SCRIPT_PATH, strerror(errno));
oemCleanupHooks();
return false;
}
return true;
}
void setupOemIptablesHook() {
if (0 == access(OEM_SCRIPT_PATH, R_OK | X_OK)) {
// The call to oemCleanupHooks() is superfluous when done on bootup,
// but is needed for the case where netd has crashed/stopped and is
// restarted.
if (oemCleanupHooks() && oemInitChains()) {
ALOGI("OEM iptable hook installed.");
}
}
}