commit 731da3c76930d3889938213256077940ca3e0930
Author: Ian Gulliver <ian@flamingcow.tv>
Date:   Fri Apr 26 05:34:19 2019 +0000

    Initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..4b4c904
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+mirall
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..c9dbbe7
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,5 @@
+mirall: Makefile mirall.cpp
+	g++ -std=gnu++2a -o mirall mirall.cpp -lgflags -lglog
+
+clean:
+	rm --force mirall
diff --git a/mirall.cpp b/mirall.cpp
new file mode 100644
index 0000000..a47a33a
--- /dev/null
+++ b/mirall.cpp
@@ -0,0 +1,39 @@
+#include <arpa/inet.h>
+#include <gflags/gflags.h>
+#include <glog/logging.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+
+DEFINE_int32(port, 9000, "TCP port to bind");
+
+int main(int argc, char *argv[]) {
+	google::InitGoogleLogging(argv[0]);
+	gflags::ParseCommandLineFlags(&argc, &argv, true);
+
+	auto listen_sock = socket(AF_INET6, SOCK_STREAM, 0);
+	PCHECK(listen_sock >= 0) << "socket()";
+
+	sockaddr_in6 bind_addr = {
+		.sin6_family = AF_INET6,
+		.sin6_port = htons(FLAGS_port),
+		.sin6_addr = IN6ADDR_LOOPBACK_INIT,
+	};
+	PCHECK(bind(listen_sock, (sockaddr*) &bind_addr, sizeof(bind_addr)) == 0);
+
+	PCHECK(listen(listen_sock, 128) == 0);
+
+	while (true) {
+		sockaddr_in6 client_addr;
+		socklen_t client_addr_len = sizeof(client_addr);
+
+		auto sock = accept(listen_sock, (sockaddr*) &client_addr, &client_addr_len);
+		PCHECK(sock >= 0) << "accept()";
+
+		CHECK_EQ(client_addr.sin6_family, AF_INET6);
+
+		char client_addr_str[INET6_ADDRSTRLEN];
+		PCHECK(inet_ntop(AF_INET6, &client_addr.sin6_addr, client_addr_str, sizeof(client_addr_str)));
+
+		LOG(INFO) << "new connection: [" << client_addr_str << "]:" << ntohs(client_addr.sin6_port);
+	}
+}