Oh, My, GOD! You may think I was just doing afk the past week or so, But, You'd be wrong, So, So, SO wrong. I've spent almost every day working as hard as I can on this commit here. It should work perfectly now, It should properly exclude interfaces, And, It should automatically exclude inactive ones. More testing is needed, Especially testing of running the -e argument multiple times, I.E -e eth0 -e wlan0. Anyway, Thank you for reading, And for downloading.

Vagrant/Vagrantfile

     sudo apt-get update
     sudo apt-get install nasm make build-essential grub qemu zip -y
     sudo apt-get install git vde2 zlibc libgmp-dev openssl libssl-dev libgee-dev libpth-dev libgcrypt11-dev autoconf cmake autogen mawk gawk
+    sudo vde_switch -t tap0 -t tap1 -d
   }
 
   

src/netsukuku.c

 void exclude_interface(void) {
                       char *ifs = "null1";
 		      char *old_tmp = "null2";
+                      char *old_tmp1 = "null3";
                       struct ifaddrs *addrs,*tmp;
-                      struct ifreq *a_ifs;
-                      getifaddrs(&addrs);
+                      
+                      if (getifaddrs(&addrs) !=0) {
+                          printf("%s\n", strerror(errno));
+                          exit(1);
+                      }
                       tmp = addrs;
                       while(tmp) {
+                          
 			    old_tmp = ifs;
                             
-                            if(tmp->ifa_addr && tmp->ifa_addr->sa_family == AF_PACKET)
-                                    ifs = tmp->ifa_name;
+                            Re_Check:
                             
-                                if(strncmp(ifs, "lo", 2) == 0 || strncmp(ifs, "tunl0", 5) == 0 || strncmp(ifs, "tunl1", 5) == 0 || strcmp(ifs, optarg) == 0)
-                                    goto Check_Active;
-                                    
-                            Check_Active:
+                            old_tmp1 = ifs;
+                            if(tmp && tmp->ifa_addr && tmp->ifa_addr->sa_family == AF_PACKET && tmp->ifa_flags & IFF_UP)
+                                 ifs = tmp->ifa_name;
+                                        
+                                else if(tmp && strcmp(old_tmp1, ifs) == 0) {
+                                    tmp = tmp->ifa_next;
+                                    goto Re_Check;
+                            }
+                            
+                            Re_Check1:
+                            
+                            printf("Possibly bad ifs is: %s\n", ifs);
                             
-                            a_ifs = ifs;
-                            if(a_ifs->ifr_name != IFF_UP) {
-                                tmp = tmp->ifa_next;
-                                if(tmp->ifa_addr && tmp->ifa_addr->sa_family == AF_PACKET)
-                                            ifs = tmp->ifa_name;
+                                if(tmp && (strncmp(ifs, "lo", 2) == 0 || strncmp(ifs, "tunl0", 5) == 0 || strncmp(ifs, "tunl1", 5) == 0 || strcmp(optarg, ifs) == 0)) {
+                                        printf("Bad Interface: %s\n", ifs);
+                                        tmp = tmp->ifa_next;
+                                        old_tmp1 = ifs;
+                                		if(tmp && tmp->ifa_addr && tmp->ifa_addr->sa_family == AF_PACKET && tmp->ifa_flags & IFF_UP)
+                                            		ifs = tmp->ifa_name;
+                                        
+                                                    if(tmp && strcmp(old_tmp1, ifs) == 0) {
+                                                        tmp = tmp->ifa_next;
+                                                        
+                                                        if(tmp && tmp->ifa_addr && tmp->ifa_addr->sa_family == AF_PACKET && tmp->ifa_flags & IFF_UP)
+                                                            ifs = tmp->ifa_name;
+                                                            goto Re_Check1;
+                                                    }
+                                }
+                            
+                            printf("Good ifs is: %s\n", ifs);
+                            
+                            if(strcmp(old_tmp, ifs) == 0) {
+                                printf("Loop finished: %s\n", ifs);
+                                break;
                             }
                             
                             tmp = tmp->ifa_next;
-			    if(strcmp(old_tmp, ifs) == 0)
-					break;
-			    server_opt.ifs[server_opt.ifs_n++]=xstrndup(ifs, IFNAMSIZ-1);
+                            server_opt.ifs[server_opt.ifs_n++]=xstrndup(ifs, IFNAMSIZ-1);
+                            printf("Using Interface: %s\n", ifs);
                           }
 
 freeifaddrs(addrs);