ircd::net: Add conditional interface to getifaddrs() w/ console cmd.

include/ircd/net/addrs.h

@@ -0,0 +1,26 @@
+// Matrix Construct
+//
+// Copyright (C) Matrix Construct Developers, Authors & Contributors
+// Copyright (C) 2016-2019 Jason Volk <jason@zemos.net>
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice is present in all copies. The
+// full license for this software is available in the LICENSE file.
+
+#pragma once
+#define HAVE_IRCD_NET_ADDRS_H
+
+extern "C"
+{
+	struct ifaddrs;
+}
+
+namespace ircd::net::addrs
+{
+	using closure = std::function<bool (const string_view &, const ipport &, const uint &)>;
+	using raw_closure = std::function<bool (const struct ::ifaddrs &)>;
+
+	bool for_each(const raw_closure &);
+	bool for_each(const closure &);
+}

include/ircd/net/net.h

@@ -40,6 +40,7 @@ namespace ircd::net
 #include "listener.h"
 #include "listener_udp.h"
 #include "sock_opts.h"
+#include "addrs.h"
 #include "open.h"
 #include "close.h"
 #include "wait.h"

ircd/net.cc

@@ -9,6 +9,7 @@
 // full license for this software is available in the LICENSE file.
 
 #include <ircd/asio.h>
+#include <RB_INC_IFADDRS_H
 
 namespace ircd::net
 {
@@ -684,6 +685,74 @@ ircd::net::open(socket &socket,
 		connector({}, opts.hostport, opts.ipport);
 }
 
+///////////////////////////////////////////////////////////////////////////////
+//
+// net/addrs.h
+//
+
+bool
+ircd::net::addrs::for_each(const closure &closure)
+{
+	return for_each([&closure]
+	(const struct ::ifaddrs &ifa)
+	{
+		const string_view &name(ifa.ifa_name);
+		const uint &flags(ifa.ifa_flags);
+
+		ipport ipport;
+		if(ifa.ifa_addr) switch(ifa.ifa_addr->sa_family)
+		{
+			case AF_INET6:
+			{
+				const auto &sin(reinterpret_cast<const struct sockaddr_in6 *>(ifa.ifa_addr));
+				ipport =
+				{
+					ntoh(*reinterpret_cast<const uint128_t *>(sin->sin6_addr.s6_addr)),
+					sin->sin6_port
+				};
+				break;
+			}
+
+			case AF_INET:
+			{
+				const auto &sin(reinterpret_cast<const struct sockaddr_in *>(ifa.ifa_addr));
+				ipport = { ntoh(sin->sin_addr.s_addr), sin->sin_port };
+				break;
+			}
+
+			default:
+				return true;
+		}
+
+		return closure(name, ipport, flags);
+	});
+}
+
+#ifdef HAVE_IFADDRS_H
+bool
+ircd::net::addrs::for_each(const raw_closure &closure)
+{
+	struct ::ifaddrs *ifap_;
+	syscall(::getifaddrs, &ifap_);
+	const custom_ptr<struct ::ifaddrs> ifap
+	{
+		ifap_, ::freeifaddrs
+	};
+
+	for(auto ifa(ifap.get()); ifa; ifa = ifa->ifa_next)
+		if(!closure(*ifa))
+			return false;
+
+	return true;
+}
+#else
+bool
+ircd::net::addrs::for_each(const raw_closure &closure)
+{
+	return true;
+}
+#endif
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 // net/sopts.h

modules/console.cc

@@ -4179,6 +4179,23 @@ catch(const std::out_of_range &e)
 // net
 //
 
+bool
+console_cmd__net__addrs(opt &out, const string_view &line)
+{
+	net::addrs::for_each([&out]
+	(const string_view &name, const ipport &addr, const uint &flags)
+	{
+		out << std::left << std::setw(16) << name << " "
+		    << std::setw(32) << addr << " "
+		    << "(0x" << std::hex << flags << ")" << std::dec
+		    << std::endl;
+
+		return true;
+	});
+
+	return true;
+}
+
 bool
 console_cmd__net__host(opt &out, const string_view &line)
 {