udpcksum.h

unix网络编程卷1：套接口API的全书源码

#include	"unp.h"
#include	<pcap.h>

#include	<netinet/in_systm.h>	/* required for ip.h */
#include	<netinet/in.h>
#include	<netinet/ip.h>
#include	<netinet/ip_var.h>
#include	<netinet/udp.h>
#include	<netinet/udp_var.h>
#include	<net/if.h>
#include	<netinet/if_ether.h>

#define	TTL_OUT		64				/* outgoing TTL */

					/* declare global variables */
extern struct sockaddr	*dest, *local;
extern socklen_t		destlen, locallen;
extern int		datalink;
extern char    *device;
extern pcap_t  *pd;
extern int		rawfd;
extern int		snaplen;
extern int		verbose;
extern int		zerosum;

					/* function prototypes */
void			 cleanup(int);
char			*next_pcap(int *);
void			 open_output(void);
void			 open_pcap(void);
void			 send_dns_query(void);
void			 test_udp(void);
void			 udp_write(char *, int);
struct udpiphdr *udp_read(void);