1 /* host - print information about a host
2 * originally written by Paul Vixie @DEC WRL, January 1989
3 */
4
5 /* DECWRL Header: host.c,v 1.1 89/04/05 15:41:12 vixie Locked $ */
6
7 #include <sys/param.h>
8 #include <sys/socket.h>
9 #include <netinet/in.h>
10 #include <arpa/inet.h>
11 #include <arpa/nameser.h>
12
13 #include <stdio.h>
14 #include <resolv.h>
15 #include <netdb.h>
16 #include <syslog.h>
17 #include <string.h>
18 #include <stdlib.h>
19
20 #ifndef LOG_PERROR
21 #define LOG_PERROR 0
22 #endif
23
main(argc,argv)24 int main(argc, argv)
25 int argc;
26 char **argv;
27 {
28 unsigned char b_addr[IN6ADDRSZ];
29 struct hostent *host;
30 char **ap, **cp, *arg;
31 const char *prog = "amnesia";
32 int af = AF_INET;
33 int size = INADDRSZ;
34 int force = 0;
35
36 if (argc < 1) {
37 usage:
38 printf("usage: %s [-d] [-6] [-f] (hostname|ipaddr)\n", prog);
39 exit(1);
40 }
41 prog = *argv++;
42 argc--;
43 #ifdef LOG_USER
44 openlog(prog, LOG_PERROR, LOG_USER);
45 #else
46 openlog(prog, LOG_PERROR);
47 #endif
48 res_init();
49
50 if (argc >= 1 && !strcmp(*argv, "-d")) {
51 _res.options |= RES_DEBUG;
52 argv++, argc--;
53 }
54 if (argc >= 1 && !strcmp(*argv, "-6")) {
55 af = AF_INET6, size = IN6ADDRSZ;
56 _res.options |= RES_USE_INET6;
57 argv++, argc--;
58 }
59 if (argc >= 1 && !strcmp(*argv, "-f")) {
60 force++;
61 argv++, argc--;
62 }
63
64 if (argc < 1)
65 goto usage;
66 arg = *argv++;
67 argc--;
68
69 if (inet_pton(af, arg, b_addr)) {
70 char p[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"];
71
72 printf("[%s]\n", inet_ntop(af, b_addr, p, sizeof p));
73 if (!(host = gethostbyaddr((char *)b_addr, size, af))) {
74 herror("gethostbyaddr");
75 exit(1);
76 }
77 } else {
78 printf("{%s}\n", arg);
79 if (force)
80 host = gethostbyname2(arg, af);
81 else
82 host = gethostbyname(arg);
83 if (!host) {
84 herror("gethostbyname*");
85 exit(1);
86 }
87 }
88 printf("name: %s\n", host->h_name);
89 if (host->h_aliases && *host->h_aliases) {
90 printf("aliases:");
91 for (cp = (char **)host->h_aliases; *cp; cp++)
92 printf(" %s", *cp);
93 printf("\n");
94 }
95 if (host->h_addr_list && *host->h_addr_list) {
96 printf("addresses:");
97 for (ap = host->h_addr_list; *ap; ap++) {
98 char p[sizeof
99 "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"];
100
101 printf(" %s", inet_ntop(host->h_addrtype,
102 *ap, p, sizeof p));
103 }
104 printf("\n");
105 }
106 exit(0);
107 }
108