test: use ares_free_string() throughout

As pointed out by Gisle Vanem in #125.

test/ares-test-internal.cc

@@ -190,7 +190,7 @@ TEST(LibraryInit, StrdupFailures) {
   EXPECT_EQ(ARES_SUCCESS, ares_library_init(ARES_LIB_INIT_ALL));
   char* copy = ares_strdup("string");
   EXPECT_NE(nullptr, copy);
-  free(copy);
+  ares_free(copy);
   ares_library_cleanup();
 }
 
@@ -248,7 +248,7 @@ TEST_F(LibraryTest, ReadLine) {
   TempFile temp("abcde\n0123456789\nXYZ\n012345678901234567890\n\n");
   FILE *fp = fopen(temp.filename(), "r");
   size_t bufsize = 4;
-  char *buf = (char *)malloc(bufsize);
+  char *buf = (char *)ares_malloc(bufsize);
 
   EXPECT_EQ(ARES_SUCCESS, ares__read_line(fp, &buf, &bufsize));
   EXPECT_EQ("abcde", std::string(buf));
@@ -261,7 +261,7 @@ TEST_F(LibraryTest, ReadLine) {
   EXPECT_EQ(nullptr, buf);
 
   fclose(fp);
-  free(buf);
+  ares_free(buf);
 }
 
 TEST_F(LibraryTest, ReadLineNoBuf) {
@@ -283,7 +283,7 @@ TEST_F(LibraryTest, ReadLineNoBuf) {
   EXPECT_EQ("012345678901234567890", std::string(buf));
 
   fclose(fp);
-  free(buf);
+  ares_free(buf);
 }
 
 TEST(Misc, GetHostent) {
@@ -373,7 +373,7 @@ TEST_F(DefaultChannelTest, SingleDomain) {
   channel_->flags |= ARES_FLAG_NOSEARCH|ARES_FLAG_NOALIASES;
   EXPECT_EQ(ARES_SUCCESS, single_domain(channel_, "www", &ptr));
   EXPECT_EQ("www", std::string(ptr));
-  free(ptr);
+  ares_free(ptr);
   ptr = nullptr;
 
   SetAllocFail(1);

test/ares-test-misc.cc

@@ -276,7 +276,7 @@ std::string ExpandName(const std::vector<byte>& data, int offset,
   } else {
     result = "<error>";
   }
-  free(name);
+  ares_free_string(name);
   return result;
 }
 
@@ -467,7 +467,7 @@ TEST_F(LibraryTest, ExpandString) {
                                (unsigned char**)&result, &len));
   EXPECT_EQ("abc", std::string(result));
   EXPECT_EQ(1 + 3, len);  // amount of data consumed includes 1 byte len
-  free(result);
+  ares_free_string(result);
   result = nullptr;
   EXPECT_EQ(ARES_EBADSTR,
             ares_expand_string(s1.data() + 1, s1.data(), s1.size(),

test/ares-test.cc

@@ -280,7 +280,7 @@ void MockServer::ProcessFD(int fd) {
   qlen -= enclen;
   question += enclen;
   std::string namestr(name);
-  free(name);
+  ares_free_string(name);
 
   if (qlen < 4) {
     std::cerr << "Unexpected question size (" << qlen

test/dns-proto.cc

@@ -248,7 +248,7 @@ std::string QuestionToString(const std::vector<byte>& packet,
   *len -= enclen;
   *data += enclen;
   ss << "'" << name << "' ";
-  free(name);
+  ares_free_string(name);
   if (*len < NS_QFIXEDSZ) {
     ss << "(too short, len left " << *len << ")";
     return ss.str();
@@ -284,7 +284,7 @@ std::string RRToString(const std::vector<byte>& packet,
   *len -= enclen;
   *data += enclen;
   ss << "'" << name << "' ";
-  free(name);
+  ares_free_string(name);
   name = nullptr;
 
   if (*len < NS_RRFIXEDSZ) {
@@ -336,7 +336,7 @@ std::string RRToString(const std::vector<byte>& packet,
         break;
       }
       ss << " '" << name << "'";
-      free(name);
+      ares_free_string(name);
       break;
     }
     case ns_t_mx:
@@ -347,7 +347,7 @@ std::string RRToString(const std::vector<byte>& packet,
           break;
         }
         ss << " " << DNS__16BIT(*data) << " '" << name << "'";
-        free(name);
+        ares_free_string(name);
       } else {
         ss << "(RR too short)";
       }
@@ -365,7 +365,7 @@ std::string RRToString(const std::vector<byte>& packet,
           break;
         }
         ss << prio << " " << weight << " " << port << " '" << name << "'";
-        free(name);
+        ares_free_string(name);
       } else {
         ss << "(RR too short)";
       }
@@ -379,7 +379,7 @@ std::string RRToString(const std::vector<byte>& packet,
         break;
       }
       ss << " '" << name << "'";
-      free(name);
+      ares_free_string(name);
       p += enclen;
       rc = ares_expand_name(p, packet.data(), packet.size(), &name, &enclen);
       if (rc != ARES_SUCCESS) {
@@ -387,7 +387,7 @@ std::string RRToString(const std::vector<byte>& packet,
         break;
       }
       ss << " '" << name << "'";
-      free(name);
+      ares_free_string(name);
       p += enclen;
       if ((p + 20) <= (*data + rdatalen)) {
         unsigned long serial = DNS__32BIT(p);
@@ -430,7 +430,7 @@ std::string RRToString(const std::vector<byte>& packet,
           break;
         }
         ss << " '" << name << "'";
-        free(name);
+        ares_free_string(name);
       } else {
         ss << "(RR too short)";
       }