net/dns/dns_config_service_posix_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include <resolv.h>
   6
   7 #include "base/sys_byteorder.h"
   8 #include "net/dns/dns_config_service_posix.h"
   9
  10 #include "testing/gtest/include/gtest/gtest.h"
  11
  12 #if !defined(OS_ANDROID)
  13
  14 namespace net {
  15 namespace {
  16
  17 // MAXNS is normally 3, but let's test 4 if possible.
  18 const char* const kNameserversIPv4[] = {
  19     "8.8.8.8",
  20     "192.168.1.1",
  21     "63.1.2.4",
  22     "1.0.0.1",
  23 };
  24
  25 #if defined(OS_LINUX)
  26 const char* const kNameserversIPv6[] = {
  27     NULL,
  28     "2001:DB8:0::42",
  29     NULL,
  30     "::FFFF:129.144.52.38",
  31 };
  32 #endif
  33
  34 // Fills in |res| with sane configuration.
  35 void InitializeResState(res_state res) {
  36   memset(res, 0, sizeof(*res));
  37   res->options = RES_INIT | RES_RECURSE | RES_DEFNAMES | RES_DNSRCH |
  38                  RES_ROTATE;
  39   res->ndots = 2;
  40   res->retrans = 4;
  41   res->retry = 7;
  42
  43   const char kDnsrch[] = "chromium.org" "\0" "example.com";
  44   memcpy(res->defdname, kDnsrch, sizeof(kDnsrch));
  45   res->dnsrch[0] = res->defdname;
  46   res->dnsrch[1] = res->defdname + sizeof("chromium.org");
  47
  48   for (unsigned i = 0; i < arraysize(kNameserversIPv4) && i < MAXNS; ++i) {
  49     struct sockaddr_in sa;
  50     sa.sin_family = AF_INET;
  51     sa.sin_port = base::HostToNet16(NS_DEFAULTPORT + i);
  52     inet_pton(AF_INET, kNameserversIPv4[i], &sa.sin_addr);
  53     res->nsaddr_list[i] = sa;
  54     ++res->nscount;
  55   }
  56
  57 #if defined(OS_LINUX)
  58   // Install IPv6 addresses, replacing the corresponding IPv4 addresses.
  59   unsigned nscount6 = 0;
  60   for (unsigned i = 0; i < arraysize(kNameserversIPv6) && i < MAXNS; ++i) {
  61     if (!kNameserversIPv6[i])
  62       continue;
  63     // Must use malloc to mimick res_ninit.
  64     struct sockaddr_in6 *sa6;
  65     sa6 = (struct sockaddr_in6 *)malloc(sizeof(*sa6));
  66     sa6->sin6_family = AF_INET6;
  67     sa6->sin6_port = base::HostToNet16(NS_DEFAULTPORT - i);
  68     inet_pton(AF_INET6, kNameserversIPv6[i], &sa6->sin6_addr);
  69     res->_u._ext.nsaddrs[i] = sa6;
  70     memset(&res->nsaddr_list[i], 0, sizeof res->nsaddr_list[i]);
  71     ++nscount6;
  72   }
  73   res->_u._ext.nscount6 = nscount6;
  74 #endif
  75 }
  76
  77 void CloseResState(res_state res) {
  78 #if defined(OS_LINUX)
  79   for (int i = 0; i < res->nscount; ++i) {
  80     if (res->_u._ext.nsaddrs[i] != NULL)
  81       free(res->_u._ext.nsaddrs[i]);
  82   }
  83 #endif
  84 }
  85
  86 void InitializeExpectedConfig(DnsConfig* config) {
  87   config->ndots = 2;
  88   config->timeout = base::TimeDelta::FromSeconds(4);
  89   config->attempts = 7;
  90   config->rotate = true;
  91   config->edns0 = false;
  92   config->append_to_multi_label_name = true;
  93   config->search.clear();
  94   config->search.push_back("chromium.org");
  95   config->search.push_back("example.com");
  96
  97   config->nameservers.clear();
  98   for (unsigned i = 0; i < arraysize(kNameserversIPv4) && i < MAXNS; ++i) {
  99     IPAddressNumber ip;
 100     ParseIPLiteralToNumber(kNameserversIPv4[i], &ip);
 101     config->nameservers.push_back(IPEndPoint(ip, NS_DEFAULTPORT + i));
 102   }
 103
 104 #if defined(OS_LINUX)
 105   for (unsigned i = 0; i < arraysize(kNameserversIPv6) && i < MAXNS; ++i) {
 106     if (!kNameserversIPv6[i])
 107       continue;
 108     IPAddressNumber ip;
 109     ParseIPLiteralToNumber(kNameserversIPv6[i], &ip);
 110     config->nameservers[i] = IPEndPoint(ip, NS_DEFAULTPORT - i);
 111   }
 112 #endif
 113 }
 114
 115 TEST(DnsConfigServicePosixTest, ConvertResStateToDnsConfig) {
 116   struct __res_state res;
 117   DnsConfig config;
 118   EXPECT_FALSE(config.IsValid());
 119   InitializeResState(&res);
 120   ASSERT_EQ(internal::CONFIG_PARSE_POSIX_OK,
 121             internal::ConvertResStateToDnsConfig(res, &config));
 122   CloseResState(&res);
 123   EXPECT_TRUE(config.IsValid());
 124
 125   DnsConfig expected_config;
 126   EXPECT_FALSE(expected_config.EqualsIgnoreHosts(config));
 127   InitializeExpectedConfig(&expected_config);
 128   EXPECT_TRUE(expected_config.EqualsIgnoreHosts(config));
 129 }
 130
 131 TEST(DnsConfigServicePosixTest, RejectEmptyNameserver) {
 132   struct __res_state res = {};
 133   res.options = RES_INIT | RES_RECURSE | RES_DEFNAMES | RES_DNSRCH;
 134   const char kDnsrch[] = "chromium.org";
 135   memcpy(res.defdname, kDnsrch, sizeof(kDnsrch));
 136   res.dnsrch[0] = res.defdname;
 137
 138   struct sockaddr_in sa = {};
 139   sa.sin_family = AF_INET;
 140   sa.sin_port = base::HostToNet16(NS_DEFAULTPORT);
 141   sa.sin_addr.s_addr = INADDR_ANY;
 142   res.nsaddr_list[0] = sa;
 143   sa.sin_addr.s_addr = 0xCAFE1337;
 144   res.nsaddr_list[1] = sa;
 145   res.nscount = 2;
 146
 147   DnsConfig config;
 148   EXPECT_EQ(internal::CONFIG_PARSE_POSIX_NULL_ADDRESS,
 149             internal::ConvertResStateToDnsConfig(res, &config));
 150
 151   sa.sin_addr.s_addr = 0xDEADBEEF;
 152   res.nsaddr_list[0] = sa;
 153   EXPECT_EQ(internal::CONFIG_PARSE_POSIX_OK,
 154             internal::ConvertResStateToDnsConfig(res, &config));
 155 }
 156
 157 }  // namespace
 158 }  // namespace net
 159
 160 #endif  // !OS_ANDROID