test/ares-test-internal.cc

   1 #include "ares-test.h"
   2 #include "dns-proto.h"
   3
   4 #include <stdio.h>
   5
   6 extern "C" {
   7 // Remove command-line defines of package variables for the test project...
   8 #undef PACKAGE_NAME
   9 #undef PACKAGE_BUGREPORT
  10 #undef PACKAGE_STRING
  11 #undef PACKAGE_TARNAME
  12 // ... so we can include the library's config without symbol redefinitions.
  13 #include "ares_setup.h"
  14 #include "ares_nowarn.h"
  15 #include "ares_inet_net_pton.h"
  16 #include "ares_data.h"
  17 #include "ares_private.h"
  18 #include "bitncmp.h"
  19
  20 #ifdef HAVE_ARPA_INET_H
  21 #include <arpa/inet.h>
  22 #endif
  23 }
  24
  25 #include <string>
  26 #include <vector>
  27
  28 namespace ares {
  29 namespace test {
  30
  31 #ifndef CARES_SYMBOL_HIDING
  32 void CheckPtoN4(int size, unsigned int value, const char *input) {
  33   struct in_addr a4;
  34   a4.s_addr = 0;
  35   uint32_t expected = htonl(value);
  36   EXPECT_EQ(size, ares_inet_net_pton(AF_INET, input, &a4, sizeof(a4)))
  37     << " for input " << input;
  38   EXPECT_EQ(expected, a4.s_addr) << " for input " << input;
  39 }
  40 #endif
  41
  42 TEST_F(LibraryTest, InetPtoN) {
  43   struct in_addr a4;
  44   struct in6_addr a6;
  45
  46 #ifndef CARES_SYMBOL_HIDING
  47   uint32_t expected;
  48
  49   CheckPtoN4(4 * 8, 0x01020304, "1.2.3.4");
  50   CheckPtoN4(4 * 8, 0x81010101, "129.1.1.1");
  51   CheckPtoN4(4 * 8, 0xC0010101, "192.1.1.1");
  52   CheckPtoN4(4 * 8, 0xE0010101, "224.1.1.1");
  53   CheckPtoN4(4 * 8, 0xE1010101, "225.1.1.1");
  54   CheckPtoN4(4, 0xE0000000, "224");
  55   CheckPtoN4(4 * 8, 0xFD000000, "253");
  56   CheckPtoN4(4 * 8, 0xF0010101, "240.1.1.1");
  57   CheckPtoN4(4 * 8, 0x02030405, "02.3.4.5");
  58   CheckPtoN4(3 * 8, 0x01020304, "1.2.3.4/24");
  59   CheckPtoN4(3 * 8, 0x01020300, "1.2.3/24");
  60   CheckPtoN4(2 * 8, 0xa0000000, "0xa");
  61   CheckPtoN4(0, 0x02030405, "2.3.4.5/000");
  62   CheckPtoN4(1 * 8, 0x01020000, "1.2/8");
  63   CheckPtoN4(2 * 8, 0x01020000, "0x0102/16");
  64   CheckPtoN4(4 * 8, 0x02030405, "02.3.4.5");
  65
  66   EXPECT_EQ(16 * 8, ares_inet_net_pton(AF_INET6, "::", &a6, sizeof(a6)));
  67   EXPECT_EQ(16 * 8, ares_inet_net_pton(AF_INET6, "::1", &a6, sizeof(a6)));
  68   EXPECT_EQ(16 * 8, ares_inet_net_pton(AF_INET6, "1234:5678::", &a6, sizeof(a6)));
  69   EXPECT_EQ(16 * 8, ares_inet_net_pton(AF_INET6, "12:34::ff", &a6, sizeof(a6)));
  70   EXPECT_EQ(16 * 8, ares_inet_net_pton(AF_INET6, "12:34::ffff:1.2.3.4", &a6, sizeof(a6)));
  71   EXPECT_EQ(23, ares_inet_net_pton(AF_INET6, "12:34::ffff:1.2.3.4/23", &a6, sizeof(a6)));
  72   EXPECT_EQ(3 * 8, ares_inet_net_pton(AF_INET6, "12:34::ff/24", &a6, sizeof(a6)));
  73   EXPECT_EQ(0, ares_inet_net_pton(AF_INET6, "12:34::ff/0", &a6, sizeof(a6)));
  74   EXPECT_EQ(16 * 8, ares_inet_net_pton(AF_INET6, "12:34::ffff:0.2", &a6, sizeof(a6)));
  75   EXPECT_EQ(16 * 8, ares_inet_net_pton(AF_INET6, "1234:1234:1234:1234:1234:1234:1234:1234", &a6, sizeof(a6)));
  76
  77   // Various malformed versions
  78   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET, "", &a4, sizeof(a4)));
  79   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET, " ", &a4, sizeof(a4)));
  80   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET, "0x", &a4, sizeof(a4)));
  81   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET, "0x ", &a4, sizeof(a4)));
  82   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET, "x0", &a4, sizeof(a4)));
  83   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET, "0xXYZZY", &a4, sizeof(a4)));
  84   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET, "xyzzy", &a4, sizeof(a4)));
  85   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET+AF_INET6, "1.2.3.4", &a4, sizeof(a4)));
  86   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET, "257.2.3.4", &a4, sizeof(a4)));
  87   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET, "002.3.4.x", &a4, sizeof(a4)));
  88   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET, "00.3.4.x", &a4, sizeof(a4)));
  89   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET, "2.3.4.x", &a4, sizeof(a4)));
  90   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET, "2.3.4.5.6", &a4, sizeof(a4)));
  91   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET, "2.3.4.5.6/12", &a4, sizeof(a4)));
  92   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET, "2.3.4:5", &a4, sizeof(a4)));
  93   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET, "2.3.4.5/120", &a4, sizeof(a4)));
  94   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET, "2.3.4.5/1x", &a4, sizeof(a4)));
  95   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET, "2.3.4.5/x", &a4, sizeof(a4)));
  96   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, "12:34::ff/240", &a6, sizeof(a6)));
  97   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, "12:34::ff/02", &a6, sizeof(a6)));
  98   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, "12:34::ff/2y", &a6, sizeof(a6)));
  99   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, "12:34::ff/y", &a6, sizeof(a6)));
 100   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, "12:34::ff/", &a6, sizeof(a6)));
 101   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, "", &a6, sizeof(a6)));
 102   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, ":x", &a6, sizeof(a6)));
 103   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, ":", &a6, sizeof(a6)));
 104   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, ": :1234", &a6, sizeof(a6)));
 105   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, "::12345", &a6, sizeof(a6)));
 106   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, "1234::2345:3456::0011", &a6, sizeof(a6)));
 107   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, "1234:1234:1234:1234:1234:1234:1234:1234:", &a6, sizeof(a6)));
 108   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, "1234:1234:1234:1234:1234:1234:1234:1234::", &a6, sizeof(a6)));
 109   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, "1234:1234:1234:1234:1234:1234:1234:1.2.3.4", &a6, sizeof(a6)));
 110   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, ":1234:1234:1234:1234:1234:1234:1234:1234", &a6, sizeof(a6)));
 111   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, ":1234:1234:1234:1234:1234:1234:1234:1234:", &a6, sizeof(a6)));
 112   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, "1234:1234:1234:1234:1234:1234:1234:1234:5678", &a6, sizeof(a6)));
 113   // TODO(drysdale): check whether the next two tests should give -1.
 114   EXPECT_EQ(0, ares_inet_net_pton(AF_INET6, "1234:1234:1234:1234:1234:1234:1234:1234:5678:5678", &a6, sizeof(a6)));
 115   EXPECT_EQ(0, ares_inet_net_pton(AF_INET6, "1234:1234:1234:1234:1234:1234:1234:1234:5678:5678:5678", &a6, sizeof(a6)));
 116   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, "12:34::ffff:257.2.3.4", &a6, sizeof(a6)));
 117   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, "12:34::ffff:002.2.3.4", &a6, sizeof(a6)));
 118   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, "12:34::ffff:1.2.3.4.5.6", &a6, sizeof(a6)));
 119   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, "12:34::ffff:1.2.3.4.5", &a6, sizeof(a6)));
 120   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, "12:34::ffff:1.2.3.z", &a6, sizeof(a6)));
 121   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, "12:34::ffff:1.2.3001.4", &a6, sizeof(a6)));
 122   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, "12:34::ffff:1.2.3..4", &a6, sizeof(a6)));
 123   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, "12:34::ffff:1.2.3.", &a6, sizeof(a6)));
 124
 125   // Hex constants are allowed.
 126   EXPECT_EQ(4 * 8, ares_inet_net_pton(AF_INET, "0x01020304", &a4, sizeof(a4)));
 127   expected = htonl(0x01020304);
 128   EXPECT_EQ(expected, a4.s_addr);
 129   EXPECT_EQ(4 * 8, ares_inet_net_pton(AF_INET, "0x0a0b0c0d", &a4, sizeof(a4)));
 130   expected = htonl(0x0a0b0c0d);
 131   EXPECT_EQ(expected, a4.s_addr);
 132   EXPECT_EQ(4 * 8, ares_inet_net_pton(AF_INET, "0x0A0B0C0D", &a4, sizeof(a4)));
 133   expected = htonl(0x0a0b0c0d);
 134   EXPECT_EQ(expected, a4.s_addr);
 135   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET, "0x0xyz", &a4, sizeof(a4)));
 136   EXPECT_EQ(4 * 8, ares_inet_net_pton(AF_INET, "0x1122334", &a4, sizeof(a4)));
 137   expected = htonl(0x11223340);
 138   EXPECT_EQ(expected, a4.s_addr);  // huh?
 139
 140   // No room, no room.
 141   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET, "1.2.3.4", &a4, sizeof(a4) - 1));
 142   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET6, "12:34::ff", &a6, sizeof(a6) - 1));
 143   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET, "0x01020304", &a4, 2));
 144   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET, "0x01020304", &a4, 0));
 145   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET, "0x0a0b0c0d", &a4, 0));
 146   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET, "0x0xyz", &a4, 0));
 147   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET, "0x1122334", &a4, sizeof(a4) - 1));
 148   EXPECT_EQ(-1, ares_inet_net_pton(AF_INET, "253", &a4, sizeof(a4) - 1));
 149 #endif
 150
 151   EXPECT_EQ(1, ares_inet_pton(AF_INET, "1.2.3.4", &a4));
 152   EXPECT_EQ(1, ares_inet_pton(AF_INET6, "12:34::ff", &a6));
 153   EXPECT_EQ(1, ares_inet_pton(AF_INET6, "12:34::ffff:1.2.3.4", &a6));
 154   EXPECT_EQ(0, ares_inet_pton(AF_INET, "xyzzy", &a4));
 155   EXPECT_EQ(-1, ares_inet_pton(AF_INET+AF_INET6, "1.2.3.4", &a4));
 156 }
 157
 158 TEST_F(LibraryTest, FreeCorruptData) {
 159   // ares_free_data(p) expects that there is a type field and a marker
 160   // field in the memory before p.  Feed it incorrect versions of each.
 161   struct ares_data *data = (struct ares_data *)malloc(sizeof(struct ares_data));
 162   void* p = &(data->data);
 163
 164   // Invalid type
 165   data->type = (ares_datatype)99;
 166   data->mark = ARES_DATATYPE_MARK;
 167   ares_free_data(p);
 168
 169   // Invalid marker
 170   data->type = (ares_datatype)ARES_DATATYPE_MX_REPLY;
 171   data->mark = ARES_DATATYPE_MARK + 1;
 172   ares_free_data(p);
 173
 174   // Null pointer
 175   ares_free_data(nullptr);
 176
 177   free(data);
 178 }
 179
 180 #ifndef CARES_SYMBOL_HIDING
 181 TEST(LibraryInit, StrdupFailures) {
 182   EXPECT_EQ(ARES_SUCCESS, ares_library_init(ARES_LIB_INIT_ALL));
 183   char* copy = ares_strdup("string");
 184   EXPECT_NE(nullptr, copy);
 185   free(copy);
 186   ares_library_cleanup();
 187 }
 188
 189 TEST_F(LibraryTest, StrdupFailures) {
 190   SetAllocFail(1);
 191   char* copy = ares_strdup("string");
 192   EXPECT_EQ(nullptr, copy);
 193 }
 194
 195 TEST_F(LibraryTest, MallocDataFail) {
 196   EXPECT_EQ(nullptr, ares_malloc_data((ares_datatype)99));
 197   SetAllocSizeFail(sizeof(struct ares_data));
 198   EXPECT_EQ(nullptr, ares_malloc_data(ARES_DATATYPE_MX_REPLY));
 199 }
 200
 201 TEST(Misc, Bitncmp) {
 202   byte a[4] = {0x80, 0x01, 0x02, 0x03};
 203   byte b[4] = {0x80, 0x01, 0x02, 0x04};
 204   byte c[4] = {0x01, 0xFF, 0x80, 0x02};
 205   EXPECT_GT(0, ares__bitncmp(a, b, sizeof(a)*8));
 206   EXPECT_LT(0, ares__bitncmp(b, a, sizeof(a)*8));
 207   EXPECT_EQ(0, ares__bitncmp(a, a, sizeof(a)*8));
 208
 209   for (int ii = 1; ii < (3*8+5); ii++) {
 210     EXPECT_EQ(0, ares__bitncmp(a, b, ii));
 211     EXPECT_EQ(0, ares__bitncmp(b, a, ii));
 212     EXPECT_LT(0, ares__bitncmp(a, c, ii));
 213     EXPECT_GT(0, ares__bitncmp(c, a, ii));
 214   }
 215
 216   // Last byte differs at 5th bit
 217   EXPECT_EQ(0, ares__bitncmp(a, b, 3*8 + 3));
 218   EXPECT_EQ(0, ares__bitncmp(a, b, 3*8 + 4));
 219   EXPECT_EQ(0, ares__bitncmp(a, b, 3*8 + 5));
 220   EXPECT_GT(0, ares__bitncmp(a, b, 3*8 + 6));
 221   EXPECT_GT(0, ares__bitncmp(a, b, 3*8 + 7));
 222 }
 223
 224 TEST_F(LibraryTest, Casts) {
 225   ssize_t ssz = 100;
 226   unsigned int u = 100;
 227   int i = 100;
 228   long l = 100;
 229
 230   unsigned int ru = aresx_sztoui(ssz);
 231   EXPECT_EQ(u, ru);
 232   int ri = aresx_sztosi(ssz);
 233   EXPECT_EQ(i, ri);
 234
 235   ri = aresx_sltosi(l);
 236   EXPECT_EQ(l, (long)ri);
 237 }
 238
 239 TEST_F(LibraryTest, ReadLine) {
 240   TempFile temp("abcde\n0123456789\nXYZ\n012345678901234567890\n\n");
 241   FILE *fp = fopen(temp.filename(), "r");
 242   size_t bufsize = 4;
 243   char *buf = (char *)malloc(bufsize);
 244
 245   EXPECT_EQ(ARES_SUCCESS, ares__read_line(fp, &buf, &bufsize));
 246   EXPECT_EQ("abcde", std::string(buf));
 247   EXPECT_EQ(ARES_SUCCESS, ares__read_line(fp, &buf, &bufsize));
 248   EXPECT_EQ("0123456789", std::string(buf));
 249   EXPECT_EQ(ARES_SUCCESS, ares__read_line(fp, &buf, &bufsize));
 250   EXPECT_EQ("XYZ", std::string(buf));
 251   SetAllocFail(1);
 252   EXPECT_EQ(ARES_ENOMEM, ares__read_line(fp, &buf, &bufsize));
 253   EXPECT_EQ(nullptr, buf);
 254
 255   fclose(fp);
 256   free(buf);
 257 }
 258
 259 TEST_F(LibraryTest, ReadLineNoBuf) {
 260   TempFile temp("abcde\n0123456789\nXYZ\n012345678901234567890");
 261   FILE *fp = fopen(temp.filename(), "r");
 262   size_t bufsize = 0;
 263   char *buf = nullptr;
 264
 265   SetAllocFail(1);
 266   EXPECT_EQ(ARES_ENOMEM, ares__read_line(fp, &buf, &bufsize));
 267
 268   EXPECT_EQ(ARES_SUCCESS, ares__read_line(fp, &buf, &bufsize));
 269   EXPECT_EQ("abcde", std::string(buf));
 270   EXPECT_EQ(ARES_SUCCESS, ares__read_line(fp, &buf, &bufsize));
 271   EXPECT_EQ("0123456789", std::string(buf));
 272   EXPECT_EQ(ARES_SUCCESS, ares__read_line(fp, &buf, &bufsize));
 273   EXPECT_EQ("XYZ", std::string(buf));
 274   EXPECT_EQ(ARES_SUCCESS, ares__read_line(fp, &buf, &bufsize));
 275   EXPECT_EQ("012345678901234567890", std::string(buf));
 276
 277   fclose(fp);
 278   free(buf);
 279 }
 280
 281 TEST(Misc, GetHostent) {
 282   TempFile hostsfile("1.2.3.4 example.com  \n"
 283                      "  2.3.4.5\tgoogle.com   www.google.com\twww2.google.com\n"
 284                      "#comment\n"
 285                      "4.5.6.7\n"
 286                      "1.3.5.7  \n"
 287                      "::1    ipv6.com");
 288   struct hostent *host = nullptr;
 289   FILE *fp = fopen(hostsfile.filename(), "r");
 290   ASSERT_NE(nullptr, fp);
 291   EXPECT_EQ(ARES_EBADFAMILY, ares__get_hostent(fp, AF_INET+AF_INET6, &host));
 292   rewind(fp);
 293
 294   EXPECT_EQ(ARES_SUCCESS, ares__get_hostent(fp, AF_INET, &host));
 295   ASSERT_NE(nullptr, host);
 296   std::stringstream ss1;
 297   ss1 << HostEnt(host);
 298   EXPECT_EQ("{'example.com' aliases=[] addrs=[1.2.3.4]}", ss1.str());
 299   ares_free_hostent(host);
 300   host = nullptr;
 301
 302   EXPECT_EQ(ARES_SUCCESS, ares__get_hostent(fp, AF_INET, &host));
 303   ASSERT_NE(nullptr, host);
 304   std::stringstream ss2;
 305   ss2 << HostEnt(host);
 306   EXPECT_EQ("{'google.com' aliases=[www.google.com, www2.google.com] addrs=[2.3.4.5]}", ss2.str());
 307   ares_free_hostent(host);
 308   host = nullptr;
 309
 310   EXPECT_EQ(ARES_EOF, ares__get_hostent(fp, AF_INET, &host));
 311
 312   rewind(fp);
 313   EXPECT_EQ(ARES_SUCCESS, ares__get_hostent(fp, AF_INET6, &host));
 314   ASSERT_NE(nullptr, host);
 315   std::stringstream ss3;
 316   ss3 << HostEnt(host);
 317   EXPECT_EQ("{'ipv6.com' aliases=[] addrs=[0000:0000:0000:0000:0000:0000:0000:0001]}", ss3.str());
 318   ares_free_hostent(host);
 319   host = nullptr;
 320   EXPECT_EQ(ARES_EOF, ares__get_hostent(fp, AF_INET6, &host));
 321   fclose(fp);
 322 }
 323
 324 TEST_F(LibraryTest, GetHostentAllocFail) {
 325   TempFile hostsfile("1.2.3.4 example.com alias1 alias2\n");
 326   struct hostent *host = nullptr;
 327   FILE *fp = fopen(hostsfile.filename(), "r");
 328   ASSERT_NE(nullptr, fp);
 329
 330   for (int ii = 1; ii <= 8; ii++) {
 331     rewind(fp);
 332     ClearFails();
 333     SetAllocFail(ii);
 334     host = nullptr;
 335     EXPECT_EQ(ARES_ENOMEM, ares__get_hostent(fp, AF_INET, &host)) << ii;
 336   }
 337   fclose(fp);
 338 }
 339 #endif
 340
 341 #ifdef CARES_EXPOSE_STATICS
 342 // These tests access internal static functions from the library, which
 343 // are only exposed when CARES_EXPOSE_STATICS has been configured. As such
 344 // they are tightly couple to the internal library implementation details.
 345 extern "C" char *ares_striendstr(const char*, const char*);
 346 TEST_F(LibraryTest, Striendstr) {
 347   EXPECT_EQ(nullptr, ares_striendstr("abc", "12345"));
 348   EXPECT_NE(nullptr, ares_striendstr("abc12345", "12345"));
 349   EXPECT_NE(nullptr, ares_striendstr("abcxyzzy", "XYZZY"));
 350   EXPECT_NE(nullptr, ares_striendstr("xyzzy", "XYZZY"));
 351   EXPECT_EQ(nullptr, ares_striendstr("xyxzy", "XYZZY"));
 352   EXPECT_NE(nullptr, ares_striendstr("", ""));
 353   const char *str = "plugh";
 354   EXPECT_NE(nullptr, ares_striendstr(str, str));
 355 }
 356 extern "C" int single_domain(ares_channel, const char*, char**);
 357 TEST_F(DefaultChannelTest, SingleDomain) {
 358   TempFile aliases("www www.google.com\n");
 359   EnvValue with_env("HOSTALIASES", aliases.filename());
 360
 361   SetAllocSizeFail(128);
 362   char *ptr = nullptr;
 363   EXPECT_EQ(ARES_ENOMEM, single_domain(channel_, "www", &ptr));
 364
 365   channel_->flags |= ARES_FLAG_NOSEARCH|ARES_FLAG_NOALIASES;
 366   EXPECT_EQ(ARES_SUCCESS, single_domain(channel_, "www", &ptr));
 367   EXPECT_EQ("www", std::string(ptr));
 368   free(ptr);
 369   ptr = nullptr;
 370
 371   SetAllocFail(1);
 372   EXPECT_EQ(ARES_ENOMEM, single_domain(channel_, "www", &ptr));
 373   EXPECT_EQ(nullptr, ptr);
 374 }
 375 #endif
 376
 377 TEST_F(DefaultChannelTest, SaveInvalidChannel) {
 378   int saved = channel_->nservers;
 379   channel_->nservers = -1;
 380   struct ares_options opts;
 381   int optmask = 0;
 382   EXPECT_EQ(ARES_ENODATA, ares_save_options(channel_, &opts, &optmask));
 383   channel_->nservers = saved;
 384 }
 385
 386 }  // namespace test
 387 }  // namespace ares