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