49 lines
890 B
C
49 lines
890 B
C
#include <netdb.h>
|
|
#include <stdio.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 hostent *he = gethostbyname(argv[i]);
|
|
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;
|
|
}
|