diff -r 0a08f79c320d -r 3693fd2eb0e9 src/main.c
--- a/src/main.c	Sun Feb 23 21:03:35 2014 +0100
+++ b/src/main.c	Thu Mar 06 15:03:06 2014 +0100
@@ -30,6 +30,8 @@
 #include "terminal-chess.h"
 #include <string.h>
 #include <time.h>
+#include <ncurses.h>
+#include "input.h"
 
 int get_settings(int argc, char **argv, Settings *settings) {
     char *valid;
@@ -104,25 +106,28 @@
 
 void dump_gameinfo(Gameinfo *gameinfo) {
     int serverwhite = gameinfo->servercolor == WHITE;
-    printf(
-        "Game details:\n"
-        "  Server plays %s  -  Client plays %s\n",
+    attron(A_UNDERLINE);
+    printw("Game details\n");
+    attroff(A_UNDERLINE);
+    printw("  Server:     %s\n  Client:     %s\n",
         serverwhite?"white":"black", serverwhite?"black":"White"
     );
     if (gameinfo->time > 0) {
         if (gameinfo->time % 60) {
-            printf("  Time limit: %ds + %ds\n",
+            printw("  Time limit: %ds + %ds\n",
                 gameinfo->time, gameinfo->addtime);
         } else {
-            printf("  Time limit: %dm + %ds\n",
+            printw("  Time limit: %dm + %ds\n",
                 gameinfo->time/60, gameinfo->addtime);
         }
     } else {
-        printf("  No time limit\n");
+        printw("  No time limit\n");
     }
+    refresh();
 }
 
 int cleanup(Settings *settings, int exitcode) {
+
     if (settings->server) {
         if (net_destroy(settings->server)) {
             perror("Server shutdown failed");
@@ -162,12 +167,17 @@
         return EXIT_SUCCESS;
     }
     
+    initscr();
+    cbreak();
+    atexit((void(*)(void)) endwin);
+    
     Server server;
     settings.server = &server;
     
     if (is_server(&settings)) {
         dump_gameinfo(&(settings.gameinfo));
-        printf("\nListening for client...\n");
+        printw("\nListening for client...\n");
+        refresh();
         if (net_create(&server, settings.port)) {
             perror("Server creation failed");
             return cleanup(&settings, EXIT_FAILURE);
@@ -178,12 +188,36 @@
             return cleanup(&settings, EXIT_FAILURE);
         }
         
-        printf("Client connected - transmitting gameinfo...\n");
-        net_send(server.client->fd, NETCODE_GAMEINFO,
-            &(settings.gameinfo), sizeof(settings.gameinfo));
+        /* net version handshake */
+        int fd = server.client->fd;
+        net_send_code(fd, NETCODE_VERSION);
+        if (net_recieve_code(fd) != NETCODE_VERSION) {
+            fprintf(stderr, "Client uses an incompatible software version.\n");
+            return cleanup(&settings, EXIT_FAILURE);
+        }
+        
+        printw("Client connected - transmitting gameinfo...");
+        refresh();
+        
+        
+        net_send_code(fd, NETCODE_GAMEINFO);
+        net_send_data(fd, &(settings.gameinfo), sizeof(settings.gameinfo));
+        printw("\rClient connected - awaiting challenge acceptance...");
+        refresh();
+        int code = net_recieve_code(fd);
+        if (code == NETCODE_ACCEPT) {
+            printw("\rClient connected - challenge accepted.");
+            clrtoeol();
+        } else if (code == NETCODE_DECLINE) {
+            printw("\rClient connected - challenge declined.");
+            clrtoeol();
+        } else {
+            fprintf(stderr, "Invalid client response\n");
+            return cleanup(&settings, EXIT_FAILURE);
+        }
     } else {
         if (net_find(&server, settings.serverhost, settings.port)) {
-            perror("Can't find server");
+            fprintf(stderr, "Can't find server\n");
             return cleanup(&settings, EXIT_FAILURE);
         }
         
@@ -191,17 +225,35 @@
             perror("Can't connect to server");
             return cleanup(&settings, EXIT_FAILURE);
         }
+        
+        int fd = server.fd;
+        if (net_recieve_code(fd) != NETCODE_VERSION) {
+            fprintf(stderr, "Server uses an incompatible software version.\n");
+            return cleanup(&settings, EXIT_FAILURE);
+        } else {
+            net_send_code(fd, NETCODE_VERSION);
+        }
 
-        printf("Connection established!\n\n");
-        if (net_recieve_code(server.fd) == NETCODE_GAMEINFO) {
-            net_recieve_data(server.fd, &(settings.gameinfo),
+        printw("Connection established!\n\n");
+        refresh();
+        
+        if (net_recieve_code(fd) == NETCODE_GAMEINFO) {
+            net_recieve_data(fd, &(settings.gameinfo),
                 sizeof(settings.gameinfo));
             dump_gameinfo(&(settings.gameinfo));
+            printw("Accept challenge (y/n)? ");
+            if (prompt_yesno()) {
+                net_send_code(fd, NETCODE_ACCEPT);
+                // TODO: start game
+            } else {
+                net_send_code(fd, NETCODE_DECLINE);
+            }
         } else {
             fprintf(stderr, "Server sent invalid gameinfo.\n");
         }
     }
     
+    getch(); /* TODO: remove */
     return cleanup(&settings, EXIT_SUCCESS);
 }