Fixed host name comparison (still Bug #17582)

mysql-test/r/ndb_config.result

@@ -9,3 +9,6 @@ ndbd,1,localhost ndbd,2,localhost ndbd,3,localhost ndbd,4,localhost ndb_mgmd,5,l
 ndbd,2,localhost ndbd,3,localhost ndbd,4,localhost ndbd,5,localhost ndb_mgmd,6,localhost mysqld,1, mysqld,7, mysqld,8, mysqld,9, mysqld,10,
 ndbd,3,localhost ndbd,4,localhost ndbd,5,localhost ndbd,6,localhost ndb_mgmd,1,localhost ndb_mgmd,2,localhost mysqld,11, mysqld,12, mysqld,13, mysqld,14, mysqld,15,
 shm,3,4,35,3 shm,3,5,35,3 shm,3,6,35,3 shm,4,5,35,4 shm,4,6,35,4 shm,5,6,35,5 tcp,11,3,55,3 tcp,11,4,55,4 tcp,11,5,55,5 tcp,11,6,55,6 tcp,12,3,55,3 tcp,12,4,55,4 tcp,12,5,55,5 tcp,12,6,55,6 tcp,13,3,55,3 tcp,13,4,55,4 tcp,13,5,55,5 tcp,13,6,55,6 tcp,14,3,55,3 tcp,14,4,55,4 tcp,14,5,55,5 tcp,14,6,55,6 tcp,15,3,55,3 tcp,15,4,55,4 tcp,15,5,55,5 tcp,15,6,55,6 tcp,1,3,55,1 tcp,1,4,55,1 tcp,1,5,55,1 tcp,1,6,55,1 tcp,2,3,55,2 tcp,2,4,55,2 tcp,2,5,55,2 tcp,2,6,55,2
+1 2 3
+
+1 2 3

mysql-test/t/ndb_config.test

@@ -16,3 +16,8 @@
 --exec $NDB_TOOLS_DIR/ndb_config --defaults-group-suffix=.cluster1 --defaults-file=$MYSQL_TEST_DIR/std_data/ndb_config_mycnf2.cnf --query=type,nodeid,host --mycnf 2> /dev/null
 --exec $NDB_TOOLS_DIR/ndb_config --defaults-group-suffix=.cluster2 --defaults-file=$MYSQL_TEST_DIR/std_data/ndb_config_mycnf2.cnf --query=type,nodeid,host --mycnf 2> /dev/null
 --exec $NDB_TOOLS_DIR/ndb_config --defaults-group-suffix=.cluster2 --defaults-file=$MYSQL_TEST_DIR/std_data/ndb_config_mycnf2.cnf --ndb-shm --connections --query=type,nodeid1,nodeid2,group,nodeidserver --mycnf 2> /dev/null
+
+
+--exec $NDB_TOOLS_DIR/ndb_config --no-defaults --query=nodeid --host=localhost --config-file=$NDB_BACKUP_DIR/config.ini 2> /dev/null
+--exec $NDB_TOOLS_DIR/ndb_config --no-defaults --query=nodeid --host=1.2.3.4   --config-file=$NDB_BACKUP_DIR/config.ini 2> /dev/null
+--exec $NDB_TOOLS_DIR/ndb_config --no-defaults --query=nodeid --host=127.0.0.1 --config-file=$NDB_BACKUP_DIR/config.ini 2> /dev/null

ndb/tools/ndb_config.cpp

@@ -411,28 +411,43 @@ HostMatch::eval(const Iter& iter)
   
   if(iter.get(m_key, &valc) == 0)
   {
-	  struct hostent *h1, *h2;
+	  struct hostent *h1, *h2, copy1;
+	  char *addr1;
+	  int stat;
 
 	  h1 = gethostbyname(m_value.c_str());
 	  if (h1 == NULL) {
 		  return 0;
 	  }
 
+	  // gethostbyname returns a pointer to a static structure
+	  // so we need to copy the results before doing the next call
+	  memcpy(&copy1, h1, sizeof(struct hostent));
+	  addr1 = (char *)malloc(copy1.h_length);
+	  memcpy(addr1, h1->h_addr, copy1.h_length);
+
 	  h2 = gethostbyname(valc);
 	  if (h2 == NULL) {
+		  free(addr1);
 		  return 0;
 	  }
 
-	  if (h1->h_addrtype != h2->h_addrtype) {
+	  if (copy1.h_addrtype != h2->h_addrtype) {
+		  free(addr1);
 		  return 0;
 	  }
 
-	  if (h1->h_length != h2->h_length) 
+	  if (copy1.h_length != h2->h_length) 
 	  {
+		  free(addr1);
 		  return 0;
 	  }
 	  
-	  return 0 == memcmp(h1->h_addr, h2->h_addr, h1->h_length);
+	  stat = memcmp(addr1, h2->h_addr, copy1.h_length);
+	  
+	  free(addr1);
+	  
+	  return (stat == 0);
   }
 
   return 0;