add: binn for communication

helpers/connect_server.c

@@ -0,0 +1,37 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <netdb.h>
+#include <sys/socket.h>
+
+#include <logger.h>
+#include <helper.h>
+
+int
+helper_connect_server(char* host, char* port)
+{
+  int s, status;
+  struct addrinfo hints, *res;
+  memset(&hints, 0, sizeof hints);
+  hints.ai_family = AF_INET; //set IP Protocol flag (IPv4 or IPv6 - we don't care)
+  hints.ai_socktype = SOCK_STREAM; //set socket flag
+
+  if ((status = getaddrinfo(host, port, &hints, &res)) != 0) { //getaddrinfo() will evaluate the given address, using the hints-flags and port, and return an IP address and other server infos
+      fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(status));
+      exit(EXIT_FAILURE);
+  }
+
+  //res got filled out by getaddrinfo() for us
+  s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); //creating Socket
+
+  if ((status = connect(s, res->ai_addr, res->ai_addrlen)) != 0) {
+      fprintf(stderr, "Keine Verbindung mit dem Netzwerk möglich.\n");
+      freeaddrinfo(res);
+      exit(EXIT_FAILURE);
+  }
+
+  freeaddrinfo(res);
+
+  return s;
+}
+