text: // Copyright (c) 2014-2020, The Sherkitty Project
  // 
  // All rights reserved.
  // 
  // Redistribution and use in source and binary forms, with or without modification, are
  // permitted provided that the following conditions are met:
  // 
  // 1. Redistributions of source code must retain the above copyright notice, this list of
  //    conditions and the following disclaimer.
  // 
  // 2. Redistributions in binary form must reproduce the above copyright notice, this list
  //    of conditions and the following disclaimer in the documentation and/or other
  //    materials provided with the distribution.
  // 
  // 3. Neither the name of the copyright holder nor the names of its contributors may be
  //    used to endorse or promote products derived from this software without specific
  //    prior written permission.
  // 
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
  // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
  // THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  // STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
  // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  #include <iostream>
  #include <vector>
  
  #include "gtest/gtest.h"
  
  #include "common/dns_utils.h"
  
  TEST(DNSResolver, IPv4Success)
  {
    tools::DNSResolver resolver = tools::DNSResolver::create();
  
    bool avail, valid;
  
    auto ips = resolver.get_ipv4("example.com", avail, valid);
  
    ASSERT_EQ(1, ips.size());
  
    //ASSERT_STREQ("93.184.216.119", ips[0].c_str());
  
    ips = tools::DNSResolver::instance().get_ipv4("example.com", avail, valid);
  
    ASSERT_EQ(1, ips.size());
  
    //ASSERT_STREQ("93.184.216.119", ips[0].c_str());
  }
  
  TEST(DNSResolver, IPv4Failure)
  {
    // guaranteed by IANA/ICANN/RFC to be invalid
    tools::DNSResolver resolver = tools::DNSResolver::create();
  
    bool avail, valid;
  
    auto ips = resolver.get_ipv4("example.invalid", avail, valid);
  
    ASSERT_EQ(0, ips.size());
  
    ips = tools::DNSResolver::instance().get_ipv4("example.invalid", avail, valid);
  
    ASSERT_EQ(0, ips.size());
  }
  
  TEST(DNSResolver, DNSSECSuccess)
  {
    tools::DNSResolver resolver = tools::DNSResolver::create();
  
    bool avail, valid;
  
    auto ips = resolver.get_ipv4("example.com", avail, valid);
  
    ASSERT_EQ(1, ips.size());
  
    //ASSERT_STREQ("93.184.216.119", ips[0].c_str());
  
    ASSERT_TRUE(avail);
    ASSERT_TRUE(valid);
  }
  
  TEST(DNSResolver, DNSSECFailure)
  {
    tools::DNSResolver resolver = tools::DNSResolver::create();
  
    bool avail, valid;
  
    auto ips = resolver.get_ipv4("dnssec-failed.org", avail, valid);
  
    ASSERT_EQ(1, ips.size());
  
    //ASSERT_STREQ("93.184.216.119", ips[0].c_str());
  
    ASSERT_TRUE(avail);
    ASSERT_FALSE(valid);
  }
  
  // It would be great to include an IPv6 test and assume it'll pass, but not every ISP / resolver plays nicely with IPv6;)
  /*TEST(DNSResolver, IPv6Success)
  {
    tools::DNSResolver resolver = tools::DNSResolver::create();
  
    bool avail, valid;
  
    auto ips = resolver.get_ipv6("example.com", avail, valid);
  
    ASSERT_EQ(1, ips.size());
  
    ASSERT_STREQ("2606:2800:220:6d:26bf:1447:1097:aa7", ips[0].c_str());
  
    ips = tools::DNSResolver::instance().get_ipv6("example.com", avail, valid);
  
    ASSERT_EQ(1, ips.size());
  
    ASSERT_STREQ("2606:2800:220:6d:26bf:1447:1097:aa7", ips[0].c_str());
  }*/
  
  TEST(DNSResolver, IPv6Failure)
  {
    // guaranteed by IANA/ICANN/RFC to be invalid
    tools::DNSResolver resolver = tools::DNSResolver::create();
  
    bool avail, valid;
  
    auto ips = resolver.get_ipv6("example.invalid", avail, valid);
  
    ASSERT_EQ(0, ips.size());
  
    ips = tools::DNSResolver::instance().get_ipv6("example.invalid", avail, valid);
  
    ASSERT_EQ(0, ips.size());
  }
  
  TEST(DNSResolver, GetTXTRecord)
  {
    bool avail, valid;
  
    std::vector<std::string> records = tools::DNSResolver::instance().get_txt_record("donate.sherkitty.com", avail, valid);
  
    EXPECT_NE(0, records.size());
  
    for (auto& rec : records)
    {
      std::cout << "TXT record for donate.sherkitty.com: " << rec << std::endl;
    }
  
    // replace first @ with .
    std::string addr = tools::DNSResolver::instance().get_dns_format_from_oa_address("donate@sherkitty.com");
    EXPECT_STREQ("donate.sherkitty.com", addr.c_str());
  
    // no change
    addr = tools::DNSResolver::instance().get_dns_format_from_oa_address("donate.sherkitty.com");
    EXPECT_STREQ("donate.sherkitty.com", addr.c_str());
  }
  
  bool is_equal(const char *s, const std::vector<std::string> &v) { return v.size() == 1 && v[0] == s; }
  
  TEST(DNS_PUBLIC, empty) { EXPECT_TRUE(tools::dns_utils::parse_dns_public("").empty()); }
  TEST(DNS_PUBLIC, default) { EXPECT_TRUE(tools::dns_utils::parse_dns_public("tcp").size() > 0); }
  TEST(DNS_PUBLIC, invalid_scheme) { EXPECT_TRUE(tools::dns_utils::parse_dns_public("invalid").empty()); }
  TEST(DNS_PUBLIC, invalid_ip_alpha) { EXPECT_TRUE(tools::dns_utils::parse_dns_public("tcp://invalid").empty()); }
  TEST(DNS_PUBLIC, invalid_ip_num1) { EXPECT_TRUE(tools::dns_utils::parse_dns_public("tcp://3").empty()); }
  TEST(DNS_PUBLIC, invalid_ip_num3) { EXPECT_TRUE(tools::dns_utils::parse_dns_public("tcp://3.4.5").empty()); }
  TEST(DNS_PUBLIC, invalid_ip_num4_extra) { EXPECT_TRUE(tools::dns_utils::parse_dns_public("tcp://3.4.5.6x").empty()); }
  TEST(DNS_PUBLIC, invalid_ip_num4_range) { EXPECT_TRUE(tools::dns_utils::parse_dns_public("tcp://3.4.542.6").empty()); }
  TEST(DNS_PUBLIC, invalid_ip_dot) { EXPECT_TRUE(tools::dns_utils::parse_dns_public("tcp://3.4.5.6.").empty()); }
  TEST(DNS_PUBLIC, invalid_ip_num5) { EXPECT_TRUE(tools::dns_utils::parse_dns_public("tcp://3.4.5.6.7").empty()); }
  TEST(DNS_PUBLIC, invalid_ip_4_missing) { EXPECT_TRUE(tools::dns_utils::parse_dns_public("tcp://3.4..7").empty()); }
  TEST(DNS_PUBLIC, valid_ip_lo) { EXPECT_TRUE(is_equal("127.0.0.1", tools::dns_utils::parse_dns_public("tcp://127.0.0.1"))); }
  TEST(DNS_PUBLIC, valid_ip) { EXPECT_TRUE(is_equal("3.4.5.6", tools::dns_utils::parse_dns_public("tcp://3.4.5.6"))); }
  