151 lines
2.6 KiB
C
151 lines
2.6 KiB
C
/*
|
|
ping.c
|
|
*/
|
|
|
|
#define DEBUG 1
|
|
|
|
#include <sys/types.h>
|
|
#include <errno.h>
|
|
#include <signal.h>
|
|
#include <net/gen/netdb.h>
|
|
#include <sys/ioctl.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <net/gen/oneCsum.h>
|
|
#include <fcntl.h>
|
|
#include <net/gen/in.h>
|
|
#include <net/gen/inet.h>
|
|
#include <net/gen/ip_hdr.h>
|
|
#include <net/gen/icmp_hdr.h>
|
|
#include <net/gen/ip_io.h>
|
|
|
|
#define WRITE_SIZE 30
|
|
char buffer[16*1024];
|
|
|
|
int main(int argc, char *argv[]);
|
|
|
|
#if DEBUG
|
|
#define where() fprintf(stderr, "%s %d:", __FILE__, __LINE__);
|
|
#endif
|
|
|
|
#if __STDC__
|
|
#define PROTO(x,y) x y
|
|
#else
|
|
#define PROTO(x,y) X ()
|
|
#endif
|
|
|
|
PROTO (int main, (int argc, char *argv[]) );
|
|
static PROTO (void sig_hand, (int signal) );
|
|
|
|
main(argc, argv)
|
|
int argc;
|
|
char *argv[];
|
|
{
|
|
int fd, i;
|
|
int result, result1;
|
|
nwio_ipopt_t ipopt;
|
|
ip_hdr_t *ip_hdr;
|
|
int ihl;
|
|
icmp_hdr_t *icmp_hdr;
|
|
ipaddr_t dst_addr;
|
|
struct hostent *hostent;
|
|
int length;
|
|
|
|
if (argc<2 || argc>3)
|
|
{
|
|
fprintf(stderr, "Usage: %s hostname [length]\n", argv[0]);
|
|
exit(1);
|
|
}
|
|
hostent= gethostbyname(argv[1]);
|
|
if (!hostent)
|
|
{
|
|
dst_addr= inet_addr(argv[1]);
|
|
if (dst_addr == -1)
|
|
{
|
|
fprintf(stderr, "%s: unknown host (%s)\n",
|
|
argv[0], argv[1]);
|
|
exit(1);
|
|
}
|
|
}
|
|
else
|
|
dst_addr= *(ipaddr_t *)(hostent->h_addr);
|
|
if (argc == 3)
|
|
{
|
|
length= strtol (argv[2], (char **)0, 0);
|
|
if (length< sizeof(icmp_hdr_t) + IP_MIN_HDR_SIZE)
|
|
{
|
|
fprintf(stderr, "%s: length too small (%s)\n",
|
|
argv[0], argv[2]);
|
|
exit(1);
|
|
}
|
|
}
|
|
else
|
|
length= WRITE_SIZE;
|
|
|
|
fd= open ("/dev/ip", O_RDWR);
|
|
if (fd<0)
|
|
perror("open"), exit(1);
|
|
|
|
ipopt.nwio_flags= NWIO_COPY | NWIO_PROTOSPEC;
|
|
ipopt.nwio_proto= 1;
|
|
|
|
result= ioctl (fd, NWIOSIPOPT, &ipopt);
|
|
if (result<0)
|
|
perror("ioctl (NWIOSIPOPT)"), exit(1);
|
|
|
|
result= ioctl (fd, NWIOGIPOPT, &ipopt);
|
|
if (result<0)
|
|
perror("ioctl (NWIOGIPOPT)"), exit(1);
|
|
|
|
for (i= 0; i< 20; i++)
|
|
{
|
|
ip_hdr= (ip_hdr_t *)buffer;
|
|
ip_hdr->ih_dst= dst_addr;
|
|
|
|
icmp_hdr= (icmp_hdr_t *)(buffer+20);
|
|
icmp_hdr->ih_type= 8;
|
|
icmp_hdr->ih_code= 0;
|
|
icmp_hdr->ih_chksum= 0;
|
|
icmp_hdr->ih_chksum= ~oneC_sum(0, (u16_t *)icmp_hdr,
|
|
WRITE_SIZE-20);
|
|
result= write(fd, buffer, length);
|
|
if (result<0)
|
|
{
|
|
perror("write");
|
|
exit(1);
|
|
}
|
|
if (result != length)
|
|
{
|
|
where();
|
|
fprintf(stderr, "result= %d\n", result);
|
|
exit(1);
|
|
}
|
|
|
|
alarm(0);
|
|
signal (SIGALRM, sig_hand);
|
|
alarm(1);
|
|
|
|
result= read(fd, buffer, sizeof(buffer));
|
|
if (result>= 0 || errno != EINTR)
|
|
break;
|
|
}
|
|
if (i >= 20)
|
|
{
|
|
printf("no answer from %s\n", argv[1]);
|
|
exit(1);
|
|
}
|
|
if (result<0)
|
|
{
|
|
perror ("read");
|
|
exit(1);
|
|
}
|
|
printf("%s is alive\n", argv[1]);
|
|
exit(0);
|
|
}
|
|
|
|
static void sig_hand(signal)
|
|
int signal;
|
|
{
|
|
}
|