]>
Commit | Line | Data |
---|---|---|
1 | #define _GNU_SOURCE | |
2 | #include <netdb.h> | |
3 | #include <stdio.h> | |
4 | #include <stdlib.h> | |
5 | #include <string.h> | |
6 | #include <arpa/inet.h> | |
7 | #include <netinet/in.h> | |
8 | #include <sys/socket.h> | |
9 | ||
10 | int main(int argc, char *argv[]) | |
11 | { | |
12 | const char *name = (argc > 1 ? argv[1] : "localhost"); | |
13 | printf("looking up '%s'\n", name); | |
14 | ||
15 | struct hostent *hent = gethostbyname(name); | |
16 | if (!hent) { | |
17 | herror("gethostbyname() failed"); | |
18 | return 1; | |
19 | } | |
20 | ||
21 | size_t i; | |
22 | printf("h_name = %s\n", hent->h_name); | |
23 | printf("h_aliases = { "); | |
24 | for (i = 0; hent->h_aliases[i]; ++i) | |
25 | printf("%s'%s'", (i ? ", " : ""), hent->h_aliases[i]); | |
26 | printf(" }\n"); | |
27 | printf("h_addr_list = { "); | |
28 | for (i = 0; hent->h_addr_list[i]; ++i) { | |
29 | struct in_addr addr; | |
30 | memcpy(&addr, hent->h_addr_list[i], sizeof(addr)); | |
31 | printf("%s'%s'", (i ? ", " : ""), inet_ntoa(addr)); | |
32 | } | |
33 | printf(" }\n"); | |
34 | ||
35 | return 0; | |
36 | } |