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      1 /*
      2  * Copyright 2018 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 <regex>
     18 #include <string>
     19 #include <vector>
     20 
     21 #include <errno.h>
     22 #include <sys/socket.h>
     23 #include <sys/types.h>
     24 #include <unistd.h>
     25 
     26 #include <android-base/stringprintf.h>
     27 #include <android/multinetwork.h>
     28 
     29 #include "VtsHalNetNetdTestUtils.h"
     30 
     31 using android::base::StringPrintf;
     32 
     33 int checkNetworkExists(net_handle_t netHandle) {
     34     int sock = socket(AF_INET6, SOCK_STREAM, 0);
     35     if (sock == -1) {
     36         return -ENOTSOCK;
     37     }
     38     int ret = android_setsocknetwork(netHandle, sock);
     39     if (ret) {
     40         ret = -errno;
     41     }
     42     close(sock);
     43     return ret;
     44 }
     45 
     46 // TODO: deduplicate this with system/netd/tests/binder_test.cpp.
     47 static std::vector<std::string> runCommand(const std::string& command) {
     48     std::vector<std::string> lines;
     49     FILE* f;
     50 
     51     if ((f = popen(command.c_str(), "r")) == nullptr) {
     52         perror("popen");
     53         return lines;
     54     }
     55 
     56     char* line = nullptr;
     57     size_t bufsize = 0;
     58     ssize_t linelen = 0;
     59     while ((linelen = getline(&line, &bufsize, f)) >= 0) {
     60         lines.push_back(std::string(line, linelen));
     61     }
     62 
     63     free(line);
     64     pclose(f);
     65     return lines;
     66 }
     67 
     68 static std::vector<std::string> listIpRules(const char* ipVersion) {
     69     std::string command = StringPrintf("%s %s rule list", IP_PATH, ipVersion);
     70     return runCommand(command);
     71 }
     72 
     73 int countMatchingIpRules(const std::string& regexString) {
     74     const std::regex regex(regexString, std::regex_constants::extended);
     75     int matches = 0;
     76 
     77     for (const char* version : {"-4", "-6"}) {
     78         std::vector<std::string> rules = listIpRules(version);
     79         for (const auto& rule : rules) {
     80             if (std::regex_search(rule, regex)) {
     81                 matches++;
     82             }
     83         }
     84     }
     85 
     86     return matches;
     87 }
     88 
     89 int countRulesForFwmark(const uint32_t fwmark) {
     90     // Skip top nibble, which differs between rules.
     91     std::string regex =
     92         StringPrintf("from all fwmark 0x(%x|[0-9a-f]+%04x)/.* lookup ", fwmark, fwmark);
     93     return countMatchingIpRules(regex);
     94 }
     95 
     96 int checkReachability(net_handle_t netHandle, const char* addrStr) {
     97     addrinfo *ai, hints = {.ai_flags = AI_NUMERICHOST | AI_NUMERICSERV};
     98     int ret = getaddrinfo(addrStr, "53", &hints, &ai);
     99     if (ret) {
    100         return -EINVAL;
    101     }
    102 
    103     int sock = socket(ai->ai_family, SOCK_DGRAM, 0);
    104     if (sock == -1 || android_setsocknetwork(netHandle, sock) == -1) {
    105         ret = -errno;
    106         freeaddrinfo(ai);
    107         return ret;
    108     }
    109 
    110     ret = connect(sock, ai->ai_addr, ai->ai_addrlen);
    111     close(sock);
    112     if (ret == -1) {
    113         ret = -errno;
    114     }
    115     freeaddrinfo(ai);
    116     return ret;
    117 }
    118