From 82caed54938683d8112615c8e65fa1456f1130ee Mon Sep 17 00:00:00 2001
From: Carl Hetherington <cth@carlh.net>
Date: Tue, 5 Nov 2013 16:55:39 +0000
Subject: Server broadcasts presence to subnet (untested).

---
 src/lib/cross.cc  | 31 +++++++++++++++++++++++++++++++
 src/lib/cross.h   |  1 +
 src/lib/server.cc | 25 +++++++++++++++++++++++++
 src/lib/util.h    |  2 ++
 4 files changed, 59 insertions(+)

(limited to 'src/lib')

diff --git a/src/lib/cross.cc b/src/lib/cross.cc
index 4b0b440c5..94edb688b 100644
--- a/src/lib/cross.cc
+++ b/src/lib/cross.cc
@@ -35,6 +35,12 @@
 #include <sys/sysctl.h>
 #include <mach-o/dyld.h>
 #endif
+#ifdef DCPOMATIC_POSIX
+#include <sys/types.h>
+#include <ifaddrs.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#endif
 #include "exceptions.h"
 
 using std::pair;
@@ -262,3 +268,28 @@ openssl_path ()
 #endif
 
 }
+
+list<string>
+network_interfaces ()
+{
+	list<string> interfaces;
+	
+#ifdef DCPOMATIC_POSIX
+	struct ifaddrs* addresses = 0;
+
+	getifaddrs (&addresses);
+
+	for (struct ifaddrs* i = addresses; i; i = i->ifa_next) {
+		if (i->ifa_addr->sa_family == AF_INET) {
+			void* p = &((struct sockaddr_in *) i->ifa_addr)->sin_addr;
+			char b[INET_ADDRSTRLEN];
+			inet_ntop (AF_INET, p, b, INET_ADDRSTRLEN);
+			interfaces.push_back (b);
+		}
+	}
+
+	freeifaddrs (addresses);
+#endif
+
+	return interfaces;
+}
diff --git a/src/lib/cross.h b/src/lib/cross.h
index 1fe34edbe..c853e8537 100644
--- a/src/lib/cross.h
+++ b/src/lib/cross.h
@@ -30,6 +30,7 @@ extern std::string cpu_info ();
 extern void run_ffprobe (boost::filesystem::path, boost::filesystem::path, boost::shared_ptr<Log>);
 extern std::list<std::pair<std::string, std::string> > mount_info ();
 extern boost::filesystem::path openssl_path ();
+extern std::list<std::string> network_interfaces ();
 #ifdef DCPOMATIC_OSX
 extern boost::filesystem::path app_contents ();
 #endif
diff --git a/src/lib/server.cc b/src/lib/server.cc
index 0212dbbed..3ba7cc632 100644
--- a/src/lib/server.cc
+++ b/src/lib/server.cc
@@ -36,6 +36,7 @@
 #include "image.h"
 #include "dcp_video_frame.h"
 #include "config.h"
+#include "cross.h"
 
 #include "i18n.h"
 
@@ -43,6 +44,7 @@ using std::string;
 using std::stringstream;
 using std::multimap;
 using std::vector;
+using std::list;
 using boost::shared_ptr;
 using boost::algorithm::is_any_of;
 using boost::algorithm::split;
@@ -176,6 +178,29 @@ Server::run (int num_threads)
 	}
 
 	boost::asio::io_service io_service;
+
+	/* Broadcast our presence on our interfaces */
+	list<string> interfaces = network_interfaces ();
+	for (list<string>::iterator i = interfaces.begin(); i != interfaces.end(); ++i) {
+		boost::system::error_code error;
+
+		boost::asio::ip::udp::socket socket (io_service);
+		socket.open (boost::asio::ip::udp::v4(), error);
+		if (error) {
+			break;
+		}
+
+		socket.set_option (boost::asio::ip::udp::socket::reuse_address (true));
+		socket.set_option (boost::asio::socket_base::broadcast (true));
+	
+		boost::asio::ip::udp::endpoint end_point (boost::asio::ip::address_v4::broadcast(), Config::instance()->server_port ());
+
+		string const data = DCPOMATIC_HELLO;
+		socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
+		socket.close (error);
+	}
+
+	/* Wait to be given things to do */
 	boost::asio::ip::tcp::acceptor acceptor (io_service, boost::asio::ip::tcp::endpoint (boost::asio::ip::tcp::v4(), Config::instance()->server_port ()));
 	while (1) {
 		shared_ptr<Socket> socket (new Socket);
diff --git a/src/lib/util.h b/src/lib/util.h
index 70cb3bb0c..351c4c4d9 100644
--- a/src/lib/util.h
+++ b/src/lib/util.h
@@ -51,6 +51,8 @@ extern "C" {
 /** The maximum number of audio channels that we can cope with */
 #define MAX_AUDIO_CHANNELS 6
 
+#define DCPOMATIC_HELLO "Boys, you gotta learn not to talk to nuns that way"
+
 namespace libdcp {
 	class Signer;
 }
-- 
cgit v1.2.3