3.1.7.7 Safe Raw Sockets - Sniffer Sockets

#include < planetlab.h >
int tmp, sock;
struct sockaddr_in sin;
sock = socket(PF_INET, SOCK_RAW, IPPROTO_TCP);
tmp = 1;
setsockopt(sock, 0, SO_RAW_SNIFF, & tmp, sizeof(tmp));
sin.sin_port = htons(1234);
bind(sock, (struct sockaddr *)& sin, sizeof(sin));