in.h

#pragma once
 
#include <stdint.h>
#include <sys/socket.h>
 
#define INADDR_LOOPBACK  0x7f000001
#define INADDR_ANY       0x00000000
#define INADDR_BROADCAST 0xFFFFFFFF
#define INADDR_NONE      0xFFFFFFFF
 
#define INET_ADDRSTRLEN  16
 
/*
 * Protocols (See RFC 1700 and the IANA)
 */
#define IPPROTO_IP          0               /* dummy for IP */
#define IPPROTO_UDP        17               /* user datagram protocol */
#define IPPROTO_TCP         6               /* tcp */
 
#define IP_TOS              7
#define IP_TTL              8
#define IP_MULTICAST_LOOP   9
#define IP_MULTICAST_TTL   10
#define IP_ADD_MEMBERSHIP  11
#define IP_DROP_MEMBERSHIP 12
 
typedef uint16_t in_port_t;
typedef uint32_t in_addr_t;
 
struct in_addr {
    in_addr_t       s_addr;
};
 
struct sockaddr_in {
    sa_family_t     sin_family;
    in_port_t       sin_port;
    struct in_addr  sin_addr;
    unsigned char   sin_zero[8];
};
 
/* Request struct for multicast socket ops */
struct ip_mreq  {
    struct in_addr imr_multiaddr;   /* IP multicast address of group */
    struct in_addr imr_interface;   /* local IP address of interface */
};