Resolve RFC 6761 localhost names to loopback

net/base/net_util.h

Index: net/base/net_util.h
diff --git a/net/base/net_util.h b/net/base/net_util.h
index f2ba404ffddcb18a6bc433fabe7ad1e2991924d5..a830198602184fbad5f4bdc22ea98865a2f7a4b0 100644
--- a/net/base/net_util.h
+++ b/net/base/net_util.h
@@ -42,6 +42,8 @@ struct Parsed;
 
 namespace net {
 
+class AddressList;
+
 // This is a "forward declaration" to avoid including ip_address_number.h
 // Keep this in sync.
 typedef std::vector<unsigned char> IPAddressNumber;
@@ -354,6 +356,15 @@ const uint16_t* GetPortFieldFromSockaddr(const struct sockaddr* address,
 NET_EXPORT_PRIVATE int GetPortFromSockaddr(const struct sockaddr* address,
                                            socklen_t address_len);
 
+// Resolves a localhost name (such as "localhost" or "localhost6") into
+// IP endpoints with the given port. Returns true if |host| is one of
+// the names that indicate a loopback and false otherwise. Special IPv6

[Ryan Sleevi, 2015/06/12 01:00:04]

Documentation: You seem to mix localhost with loopback here in the description,
without quantifying the distinction.

Without poking in the implementation, it seems you use them interchangably -
perhaps align on one (with the function name, it would seem 'local hostname' is
probably the preferred term)

[estark, 2015/06/12 05:59:46]

Done.

+// names (e.g. "localhost6") will resolve to an IPv6 address only,
+// whereas other names will resolve to both IPv4 and IPv6.
+NET_EXPORT_PRIVATE bool ResolveLocalHostname(const std::string& host,
+                                             uint16_t port,
+                                             AddressList* address_list);
+
 // Returns true if |host| is one of the names (e.g. "localhost") or IP
 // addresses (IPv4 127.0.0.0/8 or IPv6 ::1) that indicate a loopback.
 //