cannot read data at server socket, though client socket sends it
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#define MYPORT 3495 // the port users will be connecting to
#define BACKLOG 10 // how many pending connections queue will hold
#define MAXDATASIZE 100
unsigned char next_header;
unsigned char payload_len;
unsigned short int reserved;
unsigned long int SPI;
unsigned long int seq_no;
unsigned char auth_data;
unsigned char ver_hlen;
unsigned char tos;
unsigned short int tlength;
unsigned short int identification;
unsigned short int flags_foff;
unsigned char ttl;
unsigned char protocol;
unsigned short int h_chksum;
unsigned long sourceip;
unsigned long destip;
struct datagram d2;
int sockfd, new_fd; // listen on sock_fd, new connection on new_fd
struct sockaddr_in my_addr; // my address information
struct sockaddr_in their_addr; // connector’s address information
struct sigaction sa;
if (setsockopt(sockfd,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(int)) == -1)
my_addr.sin_family = AF_INET; // host byte order
my_addr.sin_port = htons(MYPORT); // short, network byte order
my_addr.sin_addr.s_addr = INADDR_ANY; // automatically fill with my IP
memset(&(my_addr.sin_zero), '\0', 8); // zero the rest of the struct