NetdConstants.cpp revision bec6d04e1a84823b89e5581ea8ebcf9f08915216 
1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <string.h>
18
19#define LOG_TAG "Netd"
20
21#include <cutils/log.h>
22
23#include "NetdConstants.h"
24
25const char * const OEM_SCRIPT_PATH = "/system/bin/oem-iptables-init.sh";
26const char * const IPTABLES_PATH = "/system/bin/iptables";
27const char * const IP6TABLES_PATH = "/system/bin/ip6tables";
28const char * const TC_PATH = "/system/bin/tc";
29const char * const IP_PATH = "/system/bin/ip";
30const char * const ADD = "add";
31const char * const DEL = "del";
32
33static void logExecError(const char* argv[], int res) {
34    const char** argp = argv;
35    std::string args = "";
36    while (*argp) {
37        args += *argp;
38        args += ' ';
39        argp++;
40    }
41    ALOGE("exec() res=%d for %s", res, args.c_str());
42}
43
44static int execIptables(IptablesTarget target, bool silent, va_list args) {
45    /* Read arguments from incoming va_list; we expect the list to be NULL terminated. */
46    std::list<const char*> argsList;
47    argsList.push_back(NULL);
48    const char* arg;
49    do {
50        arg = va_arg(args, const char *);
51        argsList.push_back(arg);
52    } while (arg);
53
54    int i = 0;
55    const char* argv[argsList.size()];
56    std::list<const char*>::iterator it;
57    for (it = argsList.begin(); it != argsList.end(); it++, i++) {
58        argv[i] = *it;
59    }
60
61    int res = 0;
62    if (target == V4 || target == V4V6) {
63        argv[0] = IPTABLES_PATH;
64        int localRes = fork_and_execve(argv[0], argv);
65        if (localRes) {
66            if (!silent) {
67                logExecError(argv, localRes);
68            }
69            res |= localRes;
70        }
71    }
72    if (target == V6 || target == V4V6) {
73        argv[0] = IP6TABLES_PATH;
74        int localRes = fork_and_execve(argv[0], argv);
75        if (localRes) {
76            if (!silent) {
77                logExecError(argv, localRes);
78            }
79            res |= localRes;
80        }
81    }
82    return res;
83}
84
85int execIptables(IptablesTarget target, ...) {
86    va_list args;
87    va_start(args, target);
88    int res = execIptables(target, false, args);
89    va_end(args);
90    return res;
91}
92
93int execIptablesSilently(IptablesTarget target, ...) {
94    va_list args;
95    va_start(args, target);
96    int res = execIptables(target, true, args);
97    va_end(args);
98    return res;
99}
100