Create dummy tap interface

src/main.c

@@ -1,3 +1,54 @@
-int main(int argc, char* argv[]) {
-  return(0);
+#include <fcntl.h>
+#include <linux/if.h>
+#include <linux/if_tun.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+int tap_alloc(char *dev) {
+  struct ifreq ifr;
+  int fd, err;
+
+  if((fd = open("/dev/net/tun", O_RDWR)) < 0) {
+    return -1;
+  }
+
+  memset(&ifr, 0, sizeof(ifr));
+
+  ifr.ifr_flags = IFF_TAP | IFF_MULTI_QUEUE;
+  if(*dev) {
+    strncpy(ifr.ifr_name, dev, IFNAMSIZ);
+  }
+
+  if((err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0) {
+    close(fd);
+    return err;
+  }
+
+   return fd;
+}
+
+int main(int argc, char* argv[]) {
+  int tap_fd;
+  char tap_name[IFNAMSIZ];
+  char buffer[4096];
+  strcpy(tap_name, "taptest");
+  tap_fd = tap_alloc(tap_name);
+
+  if(tap_fd < 0) {
+    perror("Error while allocating the tap interface");
+    exit(1);
+  }
+
+  while(1) {
+    int nread = read(tap_fd,buffer,sizeof(buffer));
+    if (nread < 0) {
+      perror("Error while reading from tap");
+      close(tap_fd);
+      exit(1);
+    }
+    printf("Read %d bytes from device %s\n", nread, tap_name);
+  }
 }