From 58b5831009a698b8e9bf99be616efe73c1fe0d9d Mon Sep 17 00:00:00 2001
From: Pedro Alvarez <pedro.alvarez@softwareradiosystems.com>
Date: Mon, 9 Oct 2017 19:35:00 +0100
Subject: [PATCH] Starting to create SCTP socket for S1APP

---
 srsepc/hdr/mme/s1ap.h  |  6 +++++-
 srsepc/src/mme/s1ap.cc | 38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/srsepc/hdr/mme/s1ap.h b/srsepc/hdr/mme/s1ap.h
index de1cf9b43..2e93db2d4 100644
--- a/srsepc/hdr/mme/s1ap.h
+++ b/srsepc/hdr/mme/s1ap.h
@@ -24,10 +24,14 @@
  *
  */
 
+namespace srsepc{
+
 class s1ap
 {
 public:
   s1ap();
   virtual ~s1ap();
   int enb_listen();
-}
+};
+
+} //namespace srsepc
diff --git a/srsepc/src/mme/s1ap.cc b/srsepc/src/mme/s1ap.cc
index 37e71b834..514060178 100644
--- a/srsepc/src/mme/s1ap.cc
+++ b/srsepc/src/mme/s1ap.cc
@@ -24,10 +24,48 @@
  *
  */
 
+#include <iostream> //TODO Remove
+
+#include <strings.h>
+#include <arpa/inet.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/sctp.h>
+#include "mme/s1ap.h"
+
 namespace srsepc{
 
 s1ap::s1ap()
 {
 }
 
+s1ap::~s1ap()
+{
+}
+
+int
+s1ap::enb_listen()
+{
+  /*This function sets up the SCTP socket for eNBs to connect to*/
+  int sock_fd;
+  struct sockaddr_in s1mme_addr;//TODO make this a configurable class memeber.
+
+  sock_fd = socket (AF_INET, SOCK_SEQPACKET, IPPROTO_SCTP);
+  if (sock_fd == -1){
+    std::cout << "[S1APP] Could not create SCTP socket" <<std::endl; //TODO fix logging
+    return -1;
+  }
+
+  //S1-MME bind
+  bzero(&s1mme_addr, sizeof(s1mme_addr));
+  s1mme_addr.sin_family = AF_INET;
+  s1mme_addr.sin_addr.s_addr = htonl(INADDR_ANY);
+  s1mme_addr.sin_port = htons(18000); //TODO define S1MME_PORT
+
+  //Listen for connections
+  listen(sock_fd,SOMAXCONN);
+
+  return sock_fd;
+}
+
 }//namespace srsepc