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/*
Unix SMB/CIFS implementation.
DNS query too for Samba with socketwrapper support
Copyright (C) 2012 Kai Blin <kai@samba.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include <talloc.h>
#include <tevent.h>
#include "lib/util/samba_util.h"
#include "librpc/ndr/libndr.h"
#include "librpc/gen_ndr/ndr_dns.h"
#include "libcli/dns/libdns.h"
static void usage(void)
{
printf("Usage: samba-dig <dns-server-ip> <data> <record-type>\n\n");
}
static struct dns_name_packet *make_name_packet(TALLOC_CTX *mem_ctx,
uint16_t operation)
{
struct dns_name_packet *packet = talloc_zero(mem_ctx,
struct dns_name_packet);
if (packet == NULL) {
return NULL;
}
packet->id = random();
packet->operation |= operation | DNS_FLAG_RECURSION_DESIRED;
return packet;
}
#define QTYPE_MAP(type) if (strncmp(type_string, #type , strlen( #type )) == 0) \
return DNS_QTYPE_ ## type ;
static enum dns_qtype parse_qtype(const char *type_string)
{
QTYPE_MAP(AAAA);
QTYPE_MAP(A);
QTYPE_MAP(SOA);
QTYPE_MAP(PTR);
return -1;
}
#undef QTYPE_MAP
static struct dns_name_question *make_question(TALLOC_CTX *mem_ctx,
const char *name,
enum dns_qtype type)
{
struct dns_name_question *question = talloc(mem_ctx,
struct dns_name_question);
if (question == NULL) {
return NULL;
}
question->name = talloc_strdup(question, name);
question->question_type = type;
question->question_class = DNS_QCLASS_IN;
return question;
}
int main(int argc, char **argv)
{
TALLOC_CTX *mem_ctx = talloc_init("samba-dig");
struct tevent_context *ev;
struct dns_name_packet *dns_packet, *in_packet;
struct dns_name_question *question;
enum dns_qtype type;
enum ndr_err_code ndr_err;
struct tevent_req *req;
WERROR w_err;
DATA_BLOB out, in;
int ret = 0;
if (argc < 4) {
usage();
exit(1);
}
ev = tevent_context_init(mem_ctx);
setup_logging("samba-dig", DEBUG_STDERR);
debug_parse_levels("1");
DEBUG(1,("Querying %s for %s %s\n", argv[1], argv[2], argv[3]));
dns_packet = make_name_packet(mem_ctx, DNS_OPCODE_QUERY);
type = parse_qtype(argv[3]);
if (type == -1) {
DEBUG(0, ("Invalid DNS_QTYPE %s\n", argv[3]));
ret = 1;
goto error;
}
question = make_question(dns_packet, argv[2], type);
dns_packet->qdcount = 1;
dns_packet->questions = question;
NDR_PRINT_DEBUG(dns_name_packet, dns_packet);
ndr_err = ndr_push_struct_blob(&out, mem_ctx, dns_packet,
(ndr_push_flags_fn_t)ndr_push_dns_name_packet);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
DEBUG(0, ("Failed to marshall dns_name_packet: %d\n", ndr_err));
ret = 1;
goto error;
}
req = dns_udp_request_send(mem_ctx, ev, argv[1], out.data, out.length);
if (req == NULL) {
DEBUG(0, ("Failed to allocate memory for tevent_req\n"));
ret = 1;
goto error;
}
if (!tevent_req_poll(req, ev)) {
DEBUG(0, ("Error sending dns request\n"));
ret = 1;
goto error;
}
w_err = dns_udp_request_recv(req, mem_ctx, &in.data, &in.length);
if (!W_ERROR_IS_OK(w_err)) {
DEBUG(0, ("Error receiving dns request: %s\n", win_errstr(w_err)));
ret = 1;
goto error;
}
in_packet = talloc(mem_ctx, struct dns_name_packet);
ndr_err = ndr_pull_struct_blob(&in, in_packet, in_packet,
(ndr_pull_flags_fn_t)ndr_pull_dns_name_packet);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
DEBUG(0, ("Failed to unmarshall dns_name_packet: %d\n", ndr_err));
ret = 1;
goto error;
}
NDR_PRINT_DEBUG(dns_name_packet, in_packet);
error:
talloc_free(mem_ctx);
return ret;
}
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