58 lines
1.1 KiB
C
58 lines
1.1 KiB
C
|
#include <netdb.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
|
||
|
|
#include "hstrerror.h"
|
||
|
|
|
||
|
|
char *cmnd;
|
||
|
|
|
||
|
|
void usage(void) {
|
||
|
|
fprintf(stderr, "Usage: %s [hostname ...]\n", cmnd);
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char **argv) {
|
||
|
|
int i;
|
||
|
|
int rc = 0;
|
||
|
|
|
||
|
|
cmnd = argv[0];
|
||
|
|
|
||
|
|
if (argc < 2) {
|
||
|
|
usage();
|
||
|
|
}
|
||
|
|
|
||
|
|
for (i = 1; i < argc; i++) {
|
||
|
|
struct in_addr ia;
|
||
|
|
if (!inet_aton(argv[i], &ia)) {
|
||
|
|
fprintf(stderr, "%s: cannot parse %s\n",
|
||
|
|
argv[0], argv[i]);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
struct hostent *he = gethostbyaddr(&ia, sizeof(ia), AF_INET);
|
||
|
|
char **a;
|
||
|
|
|
||
|
|
if (!he) {
|
||
|
|
fprintf(stderr, "%s: cannot resolve %s: %s\n",
|
||
|
|
argv[0], argv[i], hstrerror(h_errno));
|
||
|
|
rc++;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
printf("%s\n", argv[i]);
|
||
|
|
printf("\tCanonical: %s\n", he->h_name);
|
||
|
|
for (a = he->h_aliases; *a; a++) {
|
||
|
|
printf("\tAlias: %s\n", *a);
|
||
|
|
}
|
||
|
|
for (a = he->h_addr_list; *a; a++) {
|
||
|
|
int j;
|
||
|
|
printf("\tAddress: ");
|
||
|
|
for (j = 0; j < he->h_length; j++) {
|
||
|
|
printf("%s%d", j ? "." : "", (unsigned char)(*a)[j]);
|
||
|
|
}
|
||
|
|
printf("\n");
|
||
|
|
}
|
||
|
|
printf("\n");
|
||
|
|
}
|
||
|
|
return rc;
|
||
|
|
}
|