* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+//usage:#define nslookup_trivial_usage
+//usage: "[HOST] [SERVER]"
+//usage:#define nslookup_full_usage "\n\n"
+//usage: "Query the nameserver for the IP address of the given HOST\n"
+//usage: "optionally using a specified DNS server"
+//usage:
+//usage:#define nslookup_example_usage
+//usage: "$ nslookup localhost\n"
+//usage: "Server: default\n"
+//usage: "Address: default\n"
+//usage: "\n"
+//usage: "Name: debian\n"
+//usage: "Address: 127.0.0.1\n"
+
#include <resolv.h>
#include "libbb.h"
// hint.ai_flags = AI_CANONNAME;
rc = getaddrinfo(hostname, NULL /*service*/, &hint, &result);
- if (!rc) {
+ if (rc == 0) {
struct addrinfo *cur = result;
unsigned cnt = 0;
bb_error_msg("can't resolve '%s'", hostname);
#endif
}
- if (ENABLE_FEATURE_CLEAN_UP)
+ if (ENABLE_FEATURE_CLEAN_UP && result)
freeaddrinfo(result);
return (rc != 0);
}
{
len_and_sockaddr *lsa;
+ if (!server)
+ return;
+
/* NB: this works even with, say, "[::1]:5353"! :) */
lsa = xhost2sockaddr(server, 53);
/* (but it also says "may be enabled in /etc/resolv.conf") */
/*_res.options |= RES_USE_INET6;*/
- if (argv[2])
- set_default_dns(argv[2]);
+ set_default_dns(argv[2]);
server_print();
+
+ /* getaddrinfo and friends are free to request a resolver
+ * reinitialization. Just in case, set_default_dns() again
+ * after getaddrinfo (in server_print). This reportedly helps
+ * with bug 675 "nslookup does not properly use second argument"
+ * at least on Debian Wheezy and Openwrt AA (eglibc based).
+ */
+ set_default_dns(argv[2]);
+
return print_host(argv[1], "Name:");
}