--- /dev/null
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <poll.h>
+
+
+#define NORMAL_PORT 1234
+#define RAW_PORT 0
+
+
+int main(int argc, char** argv)
+{
+ sockaddr_in rawLocal;
+ memset((void*)&rawLocal, 0, sizeof(rawLocal));
+ rawLocal.sin_family = AF_INET;
+ rawLocal.sin_port = htons(RAW_PORT);
+
+ int rawSocket = socket(AF_INET, SOCK_RAW, IPPROTO_UDP);
+ if(rawSocket < 0) {
+ perror("socket() for RAW socket. Root permission missing?");
+ exit(1);
+ }
+
+ if(bind(rawSocket, (sockaddr*)&rawLocal, sizeof(rawLocal)) < 0) {
+ perror("bind()");
+ exit(1);
+ }
+
+
+ sockaddr_in normalLocal;
+ memset((void*)&normalLocal, 0, sizeof(normalLocal));
+ normalLocal.sin_family = AF_INET;
+ normalLocal.sin_port = htons(NORMAL_PORT);
+
+ int normalSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+ if(normalSocket < 0) {
+ perror("socket()");
+ exit(1);
+ }
+
+ if(bind(normalSocket, (sockaddr*)&normalLocal, sizeof(normalLocal)) < 0) {
+ perror("bind()");
+ exit(1);
+ }
+
+
+ for(;;) {
+ pollfd pfds[2];
+ pfds[0].fd = normalSocket;
+ pfds[0].events = POLLIN;
+ pfds[1].fd = rawSocket;
+ pfds[1].events = POLLIN;
+
+ int result = poll((pollfd*)&pfds, 2, -1);
+ if(result < 0) {
+ perror("poll()");
+ exit(1);
+ }
+ else if(result > 0) {
+ char buffer[65536 + 1];
+ if(pfds[0].revents & POLLIN) {
+ int bytes = recv(normalSocket, (char*)&buffer, sizeof(buffer) - 1, 0);
+ if(bytes >= 0) {
+ buffer[bytes] = 0x00;
+ printf("Received %d bytes on NORMAL socket: %s\n", bytes, buffer);
+ }
+ else {
+ perror("recv()");
+ exit(1);
+ }
+ }
+ if(pfds[1].revents & POLLIN) {
+ int bytes = recv(rawSocket, (char*)&buffer, sizeof(buffer) - 1, 0);
+ if(bytes >= 0) {
+ printf("Received %d bytes on RAW socket\n", bytes);
+ }
+ else {
+ perror("recv()");
+ exit(1);
+ }
+ }
+ }
+ }
+}