ping.h

#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netinet/icmp6.h>
#include <netinet/ip6.h>
#include <sys/types.h> /* basic system data types */
#include <sys/socket.h> /* basic socket definitions */
#include <sys/time.h> /* timeval{} for select() */
#include <time.h> /* timespec{} for pselect() */
#include <netinet/in.h> /* sockaddr_in{} and other Internet defns */
#include <arpa/inet.h> /* inet(3) functions */
#include <netdb.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <pwd.h>
#include <unistd.h>
#include <sys/un.h> /* for Unix domain sockets */
#include <sys/ioctl.h>
#include <net/if.h>
#include <stdarg.h>
#include <syslog.h>
#ifdef HAVE_SOCKADDR_DL_STRUCT
#include <net/if_dl.h>
#endif

#define IPV6

#define BUFSIZE 1500
#define MAXLINE  4096

/* globals */
char recvbuf[BUFSIZE];
char sendbuf[BUFSIZE];

int datalen; /* #bytes of data, following ICMP header */
char *host;
int nsent;  /* add 1 for each sendto() */
pid_t pid;  /* our PID */
int sockfd;
int verbose;
int daemon_proc;  /* set nonzero by daemon_init() */

/* function prototypes */
void proc_v4(char *, ssize_t, struct timeval *);
void proc_v6(char *, ssize_t, struct timeval *);
void send_v4(void);
void send_v6(void);
void readloop(void);
void sig_alrm(int);
void tv_sub(struct timeval *, struct timeval *);

char * Sock_ntop_host(const struct sockaddr *sa, socklen_t salen);
struct addrinfo* host_serv(const char *host, const char *serv, int family, int socktype);
static void err_doit(int errnoflag, int level, const char *fmt, va_list ap);
void err_quit(const char *fmt, ...);
void err_sys(const char *fmt, ...);

struct proto {
 void (*fproc)(char *, ssize_t, struct timeval *);
 void (*fsend)(void);
 struct sockaddr *sasend; /* sockaddr{} for send, from getaddrinfo */
 struct sockaddr *sarecv; /* sockaddr{} for receiving */
 socklen_t salen; /* length of sockaddr{}s */
 int  icmpproto; /* IPPROTO_xxx value for ICMP */
} *pr;