change to allow (at least a bit) for multiple TXT records

src/common/dns_utils.cpp

@@ -89,7 +89,7 @@ std::vector<std::string> DNSResolver::get_ipv4(const std::string& url)
   {
     if (result.ptr->havedata)
     {
-      for (int i=0; result.ptr->data[i] != NULL; i++)
+      for (size_t i=0; result.ptr->data[i] != NULL; i++)
       {
         char as_str[INET_ADDRSTRLEN];
 
@@ -115,7 +115,7 @@ std::vector<std::string> DNSResolver::get_ipv6(const std::string& url)
   {
     if (result.ptr->havedata)
     {
-      for (int i=0; result.ptr->data[i] != NULL; i++)
+      for (size_t i=0; result.ptr->data[i] != NULL; i++)
       {
         char as_str[INET6_ADDRSTRLEN];
 
@@ -131,19 +131,24 @@ std::vector<std::string> DNSResolver::get_ipv6(const std::string& url)
   return retval;
 }
 
-std::string DNSResolver::get_txt_record(const std::string& url)
+std::vector<std::string> DNSResolver::get_txt_record(const std::string& url)
 {
   ub_result_ptr result;
+  std::vector<std::string> records;
 
   // call DNS resolver, blocking.  if return value not zero, something went wrong
   if (!ub_resolve(m_data->m_ub_context, url.c_str(), LDNS_RR_TYPE_TXT, LDNS_RR_CLASS_IN, &(result.ptr)))
   {
     if (result.ptr->havedata)
     {
-      return std::string(result.ptr->data[0]);
+      for (size_t i=0; result.ptr->data[i] != NULL; i++)
+      {
+        records.push_back(result.ptr->data[i]);
       }
     }
-  return std::string();
+  }
+
+  return records;
 }
 
 DNSResolver& DNSResolver::instance()

src/common/dns_utils.h

@@ -82,15 +82,15 @@ public:
    std::vector<std::string> get_ipv6(const std::string& url);
 
   /**
-   * @brief gets a TXT record from a DNS query for the supplied URL;
-   * if no TXT record present returns an empty string.
+   * @brief gets all TXT records from a DNS query for the supplied URL;
+   * if no TXT record present returns an empty vector.
    *
    * @param url A string containing a URL to query for
    *
-   * @return A string containing a TXT record; or an empty string
+   * @return A vector of strings containing a TXT record; or an empty vector
    */
   // TODO: modify this to accomodate DNSSEC
-  std::string get_txt_record(const std::string& url);
+   std::vector<std::string> get_txt_record(const std::string& url);
 
   /**
    * @brief Gets the singleton instance of DNSResolver

src/simplewallet/simplewallet.cpp

@@ -913,16 +913,15 @@ bool simple_wallet::transfer(const std::vector<std::string> &args_)
     {
       // if treating as an address fails, try as url
       bool dnssec_ok = false;
-      std::string addr_from_dns;
       std::string url = local_args[i];
 
       // attempt to get address from dns query
-      addr_from_dns = tools::wallet2::address_from_url(url, dnssec_ok);
+      auto addresses_from_dns = tools::wallet2::addresses_from_url(url, dnssec_ok);
 
-      // if string not empty, see if it's an address
-      if (addr_from_dns.size())
+      // for now, move on only if one address found
+      if (addresses_from_dns.size() == 1)
       {
-        if (get_account_address_from_str(de.addr, addr_from_dns))
+        if (get_account_address_from_str(de.addr, addresses_from_dns[0]))
         {
           // if it was an address, prompt user for confirmation.
           // inform user of DNSSEC validation status as well.
@@ -938,8 +937,8 @@ bool simple_wallet::transfer(const std::vector<std::string> &args_)
           }
           std::stringstream prompt;
           prompt << "For URL: " << url
-                 << "," << dnssec_str
-                 << " Monero Address = " << addr_from_dns
+                 << "," << dnssec_str << std::endl
+                 << " Monero Address = " << addresses_from_dns[0]
                  << std::endl
                  << "Is this OK? (Y/n) "
           ;
@@ -958,6 +957,10 @@ bool simple_wallet::transfer(const std::vector<std::string> &args_)
           return true;
         }
       }
+      else if (addresses_from_dns.size() > 1)
+      {
+        tools::fail_msg_writer() << "Multiple Monero addresses found for given URL: " << url << ", this is not yet supported.";
+      }
       else
       {
         fail_msg_writer() << "wrong address: " << local_args[i];

src/wallet/wallet2.cpp

@@ -831,21 +831,30 @@ std::vector<std::vector<cryptonote::tx_destination_entry>> split_amounts(
  *
  * @return a monero address (as a string) or an empty string
  */
-std::string wallet2::address_from_url(const std::string& url, bool& dnssec_valid)
+std::vector<std::string> wallet2::addresses_from_url(const std::string& url, bool& dnssec_valid)
 {
   // TODO: update this correctly once DNSResolver::get_txt_record() supports it.
   dnssec_valid = false;
-  // get txt record
-  std::string txt = tools::DNSResolver::instance().get_txt_record(url);
 
-  if (txt.size())
+  std::vector<std::string> addresses;
+  // get txt records
+  auto records = tools::DNSResolver::instance().get_txt_record(url);
+
+  // for each txt record, try to find a monero address in it.
+  for (auto& rec : records)
   {
-    return address_from_txt_record(txt);
+    std::string addr = address_from_txt_record(rec);
+    if (addr.size())
+    {
+      addresses.push_back(addr);
     }
-  return std::string();
+  }
+
+  return addresses;
 }
 
 //----------------------------------------------------------------------------------------------------
+// TODO: parse the string in a less stupid way, probably with regex
 std::string wallet2::address_from_txt_record(const std::string& s)
 {
   // make sure the txt record has "oa1:xmr" and find it

src/wallet/wallet2.h

@@ -196,7 +196,7 @@ namespace tools
 
     static bool parse_payment_id(const std::string& payment_id_str, crypto::hash& payment_id);
 
-    static std::string address_from_url(const std::string& url, bool& dnssec_valid);
+    static std::vector<std::string> addresses_from_url(const std::string& url, bool& dnssec_valid);
 
     static std::string address_from_txt_record(const std::string& s);
   private:

tests/unit_tests/address_from_url.cpp

@@ -85,18 +85,23 @@ TEST(AddressFromURL, Success)
   std::string addr = "46BeWrHpwXmHDpDEUmZBWZfoQpdc6HaERCNmx1pEYL2rAcuwufPN9rXHHtyUA4QVy66qeFQkn6sfK8aHYjA3jk3o1Bv16em";
   
   bool dnssec_result = false;
-  std::string res = tools::wallet2::address_from_url("donate.monero.cc", dnssec_result);
 
-  EXPECT_STREQ(addr.c_str(), res.c_str());
+  std::vector<std::string> addresses = tools::wallet2::addresses_from_url("donate.monero.cc", dnssec_result);
+
+  EXPECT_EQ(1, addresses.size());
+  if (addresses.size() == 1)
+  {
+    EXPECT_STREQ(addr.c_str(), addresses[0].c_str());
+  }
 }
 
 TEST(AddressFromURL, Failure)
 {
   bool dnssec_result = false;
 
-  std::string res = tools::wallet2::address_from_url("example.invalid", dnssec_result);
+  std::vector<std::string> addresses = tools::wallet2::addresses_from_url("example.invalid", dnssec_result);
 
   ASSERT_FALSE(dnssec_result);
 
-  ASSERT_STREQ("", res.c_str());
+  ASSERT_EQ(0, addresses.size());
 }

tests/unit_tests/dns_resolver.cpp

@@ -27,6 +27,7 @@
 // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include <iostream>
+#include <vector>
 
 #include "gtest/gtest.h"
 
@@ -97,8 +98,12 @@ TEST(DNSResolver, IPv6Failure)
 TEST(DNSResolver, GetTXTRecord)
 {
 
-  std::string txt = tools::DNSResolver::instance().get_txt_record("donate.monero.cc");
-  std::cout << "TXT record for donate.monero.cc: " << txt << std::endl;
+  std::vector<std::string> records = tools::DNSResolver::instance().get_txt_record("donate.monero.cc");
 
-  EXPECT_STRNE("", txt.c_str());
+  EXPECT_NE(0, records.size());
+
+  for (auto& rec : records)
+  {
+    std::cout << "TXT record for donate.monero.cc: " << rec << std::endl;
+  }
 }