Added connection class with basic binding

There's no listening yet, and still a bunch of different errors to
handle.

CMakeLists.txt

@@ -35,6 +35,7 @@ include_directories(
 	"include/")
 
 set(SRCS
+	src/connection.c
 	src/error.c
 	src/neocomm.c
 	src/nodes.c)

include/neocomm/connection.h

@@ -18,3 +18,7 @@
  */
 
 #pragma once
+
+int NeoComm_bind(const unsigned short port);
+
+void NeoComm_close_connections();

src/connection.c

@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2017  Ortega Froysa, Nicolás <deathsbreed@themusicinnoise.net>
+ * Author: Ortega Froysa, Nicolás <deathsbreed@themusicinnoise.net>
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+#include "neocomm/connection.h"
+
+#include "internal_error.h"
+
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <strings.h>
+#include <stdio.h>
+
+int NeoComm_bind(const unsigned short port) {
+	int sockfd;//, newsockfd;
+	struct sockaddr_in serv_addr;
+
+	sockfd = socket(AF_INET, SOCK_STREAM, 0);
+	int errsv = errno;
+	if(sockfd < 0)
+	{
+		if(errsv == EACCES)
+			NeoComm_error("Insufficient privileges");
+		else if(errsv == ENOBUFS)
+			NeoComm_error("Insufficient resources available");
+		else if(errsv == ENOMEM)
+			NeoComm_error("Insufficient memory to open socket");
+		else
+		{
+			char error_msg[128];
+			snprintf(error_msg, 128, "Failed to initiate socket with errno `%d'",
+					errsv);
+			NeoComm_error(error_msg);
+		}
+		return 0;
+	}
+	bzero((char*) &serv_addr, sizeof(serv_addr));
+	serv_addr.sin_family = AF_INET;
+	serv_addr.sin_port = htons(port);
+	serv_addr.sin_addr.s_addr = INADDR_ANY;
+	if(bind(sockfd, (struct sockaddr*) &serv_addr, sizeof(serv_addr)) < 0)
+	{
+		/*int errsv = errno;*/
+		// TODO: Handle all these errors and shit, I'm too lazy right now
+		return 0;
+	}
+
+	listen(sockfd, 5);
+	return 1;
+}