seastar::net::inet_address: Add dns query wrapper functions for "easy…

…" lookup

configure.py

@@ -274,7 +274,6 @@ def sanitize_vptr_flag(compiler):
     'net/tcp.cc',
     'net/dhcp.cc',
     'net/tls.cc',
-    'net/inet_address.cc',
     'net/dns.cc',
     ]
 
@@ -296,6 +295,7 @@ def sanitize_vptr_flag(compiler):
     'net/posix-stack.cc',
     'net/net.cc',
     'net/stack.cc',
+    'net/inet_address.cc',
     'rpc/rpc.cc',
     'rpc/lz4_compressor.cc',
     ]

net/dns.cc

@@ -905,3 +905,38 @@ future<seastar::net::inet_address> seastar::net::dns::resolve_name(const sstring
 future<sstring> seastar::net::dns::resolve_addr(const inet_address& addr) {
     return resolver().resolve_addr(addr);
 }
+
+future<sstring> seastar::net::inet_address::hostname() const {
+    return dns::resolve_addr(*this);
+}
+
+future<std::vector<sstring>> seastar::net::inet_address::aliases() const {
+    return dns::get_host_by_addr(*this).then([](hostent e) {
+        return make_ready_future<std::vector<sstring>>(std::move(e.names));
+    });
+}
+
+future<seastar::net::inet_address> seastar::net::inet_address::find(
+                const sstring& name) {
+    return dns::resolve_name(name);
+}
+
+future<seastar::net::inet_address> seastar::net::inet_address::find(
+                const sstring& name, family f) {
+    return dns::resolve_name(name, f);
+}
+
+future<std::vector<seastar::net::inet_address>> seastar::net::inet_address::find_all(
+                const sstring& name) {
+    return dns::get_host_by_name(name).then([](hostent e) {
+        return make_ready_future<std::vector<seastar::net::inet_address>>(std::move(e.addr_list));
+    });
+}
+
+future<std::vector<seastar::net::inet_address>> seastar::net::inet_address::find_all(
+                const sstring& name, family f) {
+    return dns::get_host_by_name(name, f).then([](hostent e) {
+        return make_ready_future<std::vector<seastar::net::inet_address>>(std::move(e.addr_list));
+    });
+}
+

net/inet_address.cc

@@ -24,6 +24,7 @@
 
 #include "inet_address.hh"
 #include "socket_defs.hh"
+#include "dns.hh"
 
 seastar::net::inet_address::inet_address()
                 : inet_address(::in_addr{ 0, })
@@ -96,6 +97,7 @@ const void * seastar::net::inet_address::data() const {
     return &_in;
 }
 
+
 std::ostream& seastar::net::operator<<(std::ostream& os, const inet_address& addr) {
     char buffer[64];
     return os << inet_ntop(int(addr.in_family()), addr.data(), buffer, sizeof(buffer));

net/inet_address.hh

@@ -73,6 +73,14 @@ public:
 
     operator const ::in_addr&() const;
     operator const ::in6_addr&() const;
+
+    future<sstring> hostname() const;
+    future<std::vector<sstring>> aliases() const;
+
+    static future<inet_address> find(const sstring&);
+    static future<inet_address> find(const sstring&, family);
+    static future<std::vector<inet_address>> find_all(const sstring&);
+    static future<std::vector<inet_address>> find_all(const sstring&, family);
 };
 
 std::ostream& operator<<(std::ostream&, const inet_address&);