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  • Committer: Chuck Short
  • Date: 2010-09-28 20:38:39 UTC
  • Revision ID: zulcss@ubuntu.com-20100928203839-pgjulytsi9ue63x1
Initial version

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source4/nbt_server/wins/wins_dns_proxy.c
 
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/* 
 
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   Unix SMB/CIFS implementation.
 
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   wins server dns proxy
 
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   Copyright (C) Stefan Metzmacher      2005
 
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   This program is free software; you can redistribute it and/or modify
 
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   it under the terms of the GNU General Public License as published by
 
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   the Free Software Foundation; either version 3 of the License, or
 
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   (at your option) any later version.
 
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   This program is distributed in the hope that it will be useful,
 
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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   GNU General Public License for more details.
 
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   You should have received a copy of the GNU General Public License
 
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
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*/
 
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#include "includes.h"
 
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#include "nbt_server/nbt_server.h"
 
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#include "nbt_server/wins/winsdb.h"
 
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#include "nbt_server/wins/winsserver.h"
 
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#include "system/time.h"
 
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#include "libcli/composite/composite.h"
 
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#include "smbd/service_task.h"
 
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#include "libcli/resolve/resolve.h"
 
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struct wins_dns_proxy_state {
 
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        struct nbt_name_socket *nbtsock;
 
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        struct nbt_name_packet *packet;
 
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        struct socket_address *src;
 
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};
 
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static void nbtd_wins_dns_proxy_handler(struct composite_context *creq)
 
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{
 
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        NTSTATUS status;
 
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        struct wins_dns_proxy_state *s = talloc_get_type(creq->async.private_data,
 
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                                                         struct wins_dns_proxy_state);
 
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        struct nbt_name *name = &s->packet->questions[0].name;
 
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        const char *address;
 
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        const char **addresses;
 
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        uint16_t nb_flags = 0; /* TODO: ... */
 
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        status = resolve_name_recv(creq, s->packet, &address);
 
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        if (!NT_STATUS_IS_OK(status)) {
 
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                goto notfound;
 
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        }
 
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        addresses = str_list_add(NULL, address);
 
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        talloc_steal(s->packet, addresses);
 
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        if (!addresses) goto notfound;
 
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        nbtd_name_query_reply(s->nbtsock, s->packet, s->src, name, 
 
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                              0, nb_flags, addresses);
 
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        return;
 
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notfound:
 
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        nbtd_negative_name_query_reply(s->nbtsock, s->packet, s->src);
 
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}
 
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/*
 
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  dns proxy query a name
 
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*/
 
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void nbtd_wins_dns_proxy_query(struct nbt_name_socket *nbtsock, 
 
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                               struct nbt_name_packet *packet, 
 
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                               struct socket_address *src)
 
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{
 
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        struct nbt_name *name = &packet->questions[0].name;
 
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        struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
 
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                                                       struct nbtd_interface);
 
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        struct wins_dns_proxy_state *s;
 
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        struct composite_context *creq;
 
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        struct resolve_context *resolve_ctx;
 
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        s = talloc(nbtsock, struct wins_dns_proxy_state);
 
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        if (!s) goto failed;
 
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        s->nbtsock      = nbtsock;
 
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        s->packet       = talloc_steal(s, packet);
 
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        s->src          = src;
 
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        if (!talloc_reference(s, src)) {
 
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                goto failed;
 
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        }
 
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        resolve_ctx = resolve_context_init(s);
 
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        if (resolve_ctx == NULL) goto failed;
 
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        resolve_context_add_host_method(resolve_ctx);
 
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        creq = resolve_name_send(resolve_ctx, name, iface->nbtsrv->task->event_ctx);
 
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        if (!creq) goto failed;
 
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        creq->async.fn          = nbtd_wins_dns_proxy_handler;
 
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        creq->async.private_data= s;
 
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        return;
 
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failed:
 
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        nbtd_negative_name_query_reply(nbtsock, packet, src);
 
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}