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libcares/test/ares-test-init.cc  view on Meta::CPAN

//     - gethostname(3) -> domain
//     - "fb" -> lookup

NameContentList filelist = {
  {"/etc/resolv.conf", "nameserver 1.2.3.4\n"
                       "sortlist 1.2.3.4/16 2.3.4.5\n"
                       "search first.com second.com\n"},
  {"/etc/hosts", "3.4.5.6 ahostname.com\n"},
  {"/etc/nsswitch.conf", "hosts: files\n"}};
CONTAINED_TEST_F(LibraryTest, ContainerChannelInit,
                 "myhostname", "mydomainname.org", filelist) {
  ares_channel channel = nullptr;
  EXPECT_EQ(ARES_SUCCESS, ares_init(&channel));
  std::vector<std::string> actual = GetNameServers(channel);
  std::vector<std::string> expected = {"1.2.3.4"};
  EXPECT_EQ(expected, actual);

  struct ares_options opts;
  int optmask = 0;
  ares_save_options(channel, &opts, &optmask);
  EXPECT_EQ(2, opts.ndomains);
  EXPECT_EQ(std::string("first.com"), std::string(opts.domains[0]));
  EXPECT_EQ(std::string("second.com"), std::string(opts.domains[1]));
  ares_destroy_options(&opts);

  HostResult result;
  ares_gethostbyname(channel, "ahostname.com", AF_INET, HostCallback, &result);
  ProcessWork(channel, NoExtraFDs, nullptr);
  EXPECT_TRUE(result.done_);
  std::stringstream ss;
  ss << result.host_;
  EXPECT_EQ("{'ahostname.com' aliases=[] addrs=[3.4.5.6]}", ss.str());

  ares_destroy(channel);
  return HasFailure();
}

CONTAINED_TEST_F(LibraryTest, ContainerSortlistOptionInit,
                 "myhostname", "mydomainname.org", filelist) {
  ares_channel channel = nullptr;
  struct ares_options opts = {0};
  int optmask = 0;
  optmask |= ARES_OPT_SORTLIST;
  opts.nsort = 0;
  // Explicitly specifying an empty sortlist in the options should override the
  // environment.
  EXPECT_EQ(ARES_SUCCESS, ares_init_options(&channel, &opts, optmask));
  ares_save_options(channel, &opts, &optmask);
  EXPECT_EQ(0, opts.nsort);
  EXPECT_EQ(nullptr, opts.sortlist);
  EXPECT_EQ(ARES_OPT_SORTLIST, (optmask & ARES_OPT_SORTLIST));
  ares_destroy_options(&opts);

  ares_destroy(channel);
  return HasFailure();
}

NameContentList fullresolv = {
  {"/etc/resolv.conf", " nameserver   1.2.3.4 \n"
                       "search   first.com second.com\n"
                       "lookup bind\n"
                       "options debug ndots:5\n"
                       "sortlist 1.2.3.4/16 2.3.4.5\n"}};
CONTAINED_TEST_F(LibraryTest, ContainerFullResolvInit,
                 "myhostname", "mydomainname.org", fullresolv) {
  ares_channel channel = nullptr;
  EXPECT_EQ(ARES_SUCCESS, ares_init(&channel));

  struct ares_options opts;
  int optmask = 0;
  ares_save_options(channel, &opts, &optmask);
  EXPECT_EQ(std::string("b"), std::string(opts.lookups));
  EXPECT_EQ(5, opts.ndots);
  ares_destroy_options(&opts);

  ares_destroy(channel);
  return HasFailure();
}

// Allow path for resolv.conf to be configurable
NameContentList myresolvconf = {
  {"/tmp/myresolv.cnf", " nameserver   1.2.3.4 \n"
                       "search   first.com second.com\n"
                       "lookup bind\n"
                       "options debug ndots:5\n"
                       "sortlist 1.2.3.4/16 2.3.4.5\n"}};
CONTAINED_TEST_F(LibraryTest, ContainerMyResolvConfInit,
                 "myhostname", "mydomain.org", myresolvconf) {
  char filename[] = "/tmp/myresolv.cnf";
  ares_channel channel = nullptr;
  struct ares_options options = {0};
  options.resolvconf_path = strdup(filename);
  int optmask = ARES_OPT_RESOLVCONF;
  EXPECT_EQ(ARES_SUCCESS, ares_init_options(&channel, &options, optmask));

  optmask = 0;
  free(options.resolvconf_path);
  options.resolvconf_path = NULL;

  EXPECT_EQ(ARES_SUCCESS, ares_save_options(channel, &options, &optmask));
  EXPECT_EQ(ARES_OPT_RESOLVCONF, (optmask & ARES_OPT_RESOLVCONF));
  EXPECT_EQ(std::string(filename), std::string(options.resolvconf_path));

  ares_destroy_options(&options);
  ares_destroy(channel);
  return HasFailure();
}

NameContentList hostconf = {
  {"/etc/resolv.conf", "nameserver 1.2.3.4\n"
                       "sortlist1.2.3.4\n"  // malformed line
                       "search first.com second.com\n"},
  {"/etc/host.conf", "order bind hosts\n"}};
CONTAINED_TEST_F(LibraryTest, ContainerHostConfInit,
                 "myhostname", "mydomainname.org", hostconf) {
  ares_channel channel = nullptr;
  EXPECT_EQ(ARES_SUCCESS, ares_init(&channel));

  struct ares_options opts;
  int optmask = 0;
  ares_save_options(channel, &opts, &optmask);
  EXPECT_EQ(std::string("bf"), std::string(opts.lookups));
  ares_destroy_options(&opts);

  ares_destroy(channel);
  return HasFailure();
}

NameContentList svcconf = {
  {"/etc/resolv.conf", "nameserver 1.2.3.4\n"
                       "search first.com second.com\n"},
  {"/etc/svc.conf", "hosts= bind\n"}};
CONTAINED_TEST_F(LibraryTest, ContainerSvcConfInit,
                 "myhostname", "mydomainname.org", svcconf) {
  ares_channel channel = nullptr;
  EXPECT_EQ(ARES_SUCCESS, ares_init(&channel));

  struct ares_options opts;
  int optmask = 0;
  ares_save_options(channel, &opts, &optmask);
  EXPECT_EQ(std::string("b"), std::string(opts.lookups));
  ares_destroy_options(&opts);

  ares_destroy(channel);
  return HasFailure();
}

// Failures when expected config filenames are inaccessible.
class MakeUnreadable {
 public:
  explicit MakeUnreadable(const std::string& filename)
    : filename_(filename) {
    chmod(filename_.c_str(), 0000);
  }
  ~MakeUnreadable() { chmod(filename_.c_str(), 0644); }
 private:
  std::string filename_;
};

CONTAINED_TEST_F(LibraryTest, ContainerResolvConfNotReadable,
                 "myhostname", "mydomainname.org", filelist) {
  ares_channel channel = nullptr;
  MakeUnreadable hide("/etc/resolv.conf");
  // Unavailable /etc/resolv.conf falls back to defaults
  EXPECT_EQ(ARES_SUCCESS, ares_init(&channel));
  return HasFailure();
}
CONTAINED_TEST_F(LibraryTest, ContainerNsswitchConfNotReadable,
                 "myhostname", "mydomainname.org", filelist) {
  ares_channel channel = nullptr;
  // Unavailable /etc/nsswitch.conf falls back to defaults.
  MakeUnreadable hide("/etc/nsswitch.conf");
  EXPECT_EQ(ARES_SUCCESS, ares_init(&channel));

  struct ares_options opts;
  int optmask = 0;
  ares_save_options(channel, &opts, &optmask);
  EXPECT_EQ(std::string("fb"), std::string(opts.lookups));
  ares_destroy_options(&opts);

  ares_destroy(channel);
  return HasFailure();
}
CONTAINED_TEST_F(LibraryTest, ContainerHostConfNotReadable,
                 "myhostname", "mydomainname.org", hostconf) {
  ares_channel channel = nullptr;
  // Unavailable /etc/host.conf falls back to defaults.
  MakeUnreadable hide("/etc/host.conf");
  EXPECT_EQ(ARES_SUCCESS, ares_init(&channel));
  ares_destroy(channel);
  return HasFailure();
}