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lookup.c
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C/C++ Source or Header
|
1995-10-14
|
740b
|
31 lines
/*translate ip to alpha, faster than nslookup*/
/*thc*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
main(argc, argv)
int argc;
char *argv[];
{
struct hostent *lookup;
char name[255];
unsigned long addr;
if (argc != 2) {
printf("Usage: %s {ipnumber}\n", argv[0]);
exit(1); }
if ((addr = inet_addr(argv[1])) == -1) {
printf("Couldn't find %s\n", argv[1]);
exit(1); }
if ((lookup = gethostbyaddr((char *) &addr,sizeof(long),AF_INET)) != NULL) {
printf("%s \t %s\n",argv[1], lookup->h_name);
*lookup->h_addr_list++; }
else
printf("Error: couldn't find hostname for %s\n", argv[1]);
}