source: vendor/3.5.5/source4/nbt_server/irpc.c

/* 
   Unix SMB/CIFS implementation.

   irpc services for the NBT server

   Copyright (C) Andrew Tridgell        2005
   Copyright (C) Volker Lendecke        2005
   
   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 "smbd/service_task.h"
#include "smbd/service.h"
#include "nbt_server/nbt_server.h"
#include "nbt_server/wins/winsserver.h"
#include "librpc/gen_ndr/ndr_irpc.h"
#include "lib/socket/socket.h"
#include "libcli/resolve/resolve.h"
#include "librpc/gen_ndr/ndr_nbt.h"

/*
  serve out the nbt statistics
*/
static NTSTATUS nbtd_information(struct irpc_message *msg, 
                                 struct nbtd_information *r)
{
        struct nbtd_server *server = talloc_get_type(msg->private_data,
                                                     struct nbtd_server);

        switch (r->in.level) {
        case NBTD_INFO_STATISTICS:
                r->out.info.stats = &server->stats;
                break;
        }

        return NT_STATUS_OK;
}


/*
  winbind needs to be able to do a getdc request, but most (all?) windows
  servers always send the reply to port 138, regardless of the request
  port. To cope with this we use a irpc request to the NBT server
  which has port 138 open, and thus can receive the replies
*/
struct getdc_state {
        struct irpc_message *msg;
        struct nbtd_getdcname *req;
};

static void getdc_recv_netlogon_reply(struct dgram_mailslot_handler *dgmslot, 
                                      struct nbt_dgram_packet *packet, 
                                      struct socket_address *src)
{
        struct getdc_state *s =
                talloc_get_type(dgmslot->private_data, struct getdc_state);
        const char *p;
        struct nbt_netlogon_response netlogon;
        NTSTATUS status;

        status = dgram_mailslot_netlogon_parse_response(dgmslot, packet, packet,
                                                        &netlogon);
        if (!NT_STATUS_IS_OK(status)) {
                DEBUG(5, ("dgram_mailslot_ntlogon_parse failed: %s\n",
                          nt_errstr(status)));
                goto done;
        }

        /* We asked for version 1 only */
        if (netlogon.response_type == NETLOGON_SAMLOGON
            && netlogon.data.samlogon.ntver != NETLOGON_NT_VERSION_1) {
                status = NT_STATUS_INVALID_NETWORK_RESPONSE;
                goto done;
        }

        p = netlogon.data.samlogon.data.nt4.server;

        DEBUG(10, ("NTLOGON_SAM_LOGON_REPLY: server: %s, user: %s, "
                   "domain: %s\n", p,
                   netlogon.data.samlogon.data.nt4.user_name,
                   netlogon.data.samlogon.data.nt4.domain));

        if (*p == '\\') p += 1;
        if (*p == '\\') p += 1;
        
        s->req->out.dcname = talloc_strdup(s->req, p);
        if (s->req->out.dcname == NULL) {
                DEBUG(0, ("talloc failed\n"));
                status = NT_STATUS_NO_MEMORY;
                goto done;
        }

        status = NT_STATUS_OK;

 done:
        irpc_send_reply(s->msg, status);
}

static NTSTATUS nbtd_getdcname(struct irpc_message *msg, 
                               struct nbtd_getdcname *req)
{
        struct nbtd_server *server =
                talloc_get_type(msg->private_data, struct nbtd_server);
        struct nbtd_interface *iface = nbtd_find_request_iface(server, req->in.ip_address, true);
        struct getdc_state *s;
        struct nbt_netlogon_packet p;
        struct NETLOGON_SAM_LOGON_REQUEST *r;
        struct nbt_name src, dst;
        struct socket_address *dest;
        struct dgram_mailslot_handler *handler;
        NTSTATUS status = NT_STATUS_UNSUCCESSFUL;

        DEBUG(0, ("nbtd_getdcname called\n"));

        s = talloc(msg, struct getdc_state);
        NT_STATUS_HAVE_NO_MEMORY(s);

        s->msg = msg;
        s->req = req;
        
        handler = dgram_mailslot_temp(iface->dgmsock, NBT_MAILSLOT_GETDC,
                                      getdc_recv_netlogon_reply, s);
        NT_STATUS_HAVE_NO_MEMORY(handler);
        
        ZERO_STRUCT(p);
        p.command = LOGON_SAM_LOGON_REQUEST;
        r = &p.req.logon;
        r->request_count = 0;
        r->computer_name = req->in.my_computername;
        r->user_name = req->in.my_accountname;
        r->mailslot_name = handler->mailslot_name;
        r->acct_control = req->in.account_control;
        r->sid = *req->in.domain_sid;
        r->nt_version = NETLOGON_NT_VERSION_1;
        r->lmnt_token = 0xffff;
        r->lm20_token = 0xffff;

        make_nbt_name_client(&src, req->in.my_computername);
        make_nbt_name(&dst, req->in.domainname, 0x1c);

        dest = socket_address_from_strings(msg, iface->dgmsock->sock->backend_name, 
                                           req->in.ip_address, 138);
        NT_STATUS_HAVE_NO_MEMORY(dest);

        status = dgram_mailslot_netlogon_send(iface->dgmsock, 
                                              &dst, dest,
                                              NBT_MAILSLOT_NETLOGON, 
                                              &src, &p);
        if (!NT_STATUS_IS_OK(status)) {
                DEBUG(0, ("dgram_mailslot_ntlogon_send failed: %s\n",
                          nt_errstr(status)));
                return status;
        }

        msg->defer_reply = true;
        return NT_STATUS_OK;
}


/*
  register the irpc handlers for the nbt server
*/
void nbtd_register_irpc(struct nbtd_server *nbtsrv)
{
        NTSTATUS status;
        struct task_server *task = nbtsrv->task;

        status = IRPC_REGISTER(task->msg_ctx, irpc, NBTD_INFORMATION, 
                               nbtd_information, nbtsrv);
        if (!NT_STATUS_IS_OK(status)) {
                task_server_terminate(task, "nbtd failed to setup monitoring", true);
                return;
        }

        status = IRPC_REGISTER(task->msg_ctx, irpc, NBTD_GETDCNAME,
                               nbtd_getdcname, nbtsrv);
        if (!NT_STATUS_IS_OK(status)) {
                task_server_terminate(task, "nbtd failed to setup getdcname "
                                      "handler", true);
                return;
        }

        status = IRPC_REGISTER(task->msg_ctx, irpc, NBTD_PROXY_WINS_CHALLENGE,
                               nbtd_proxy_wins_challenge, nbtsrv);
        if (!NT_STATUS_IS_OK(status)) {
                task_server_terminate(task, "nbtd failed to setup wins challenge "
                                      "handler", true);
                return;
        }

        status = IRPC_REGISTER(task->msg_ctx, irpc, NBTD_PROXY_WINS_RELEASE_DEMAND,
                               nbtd_proxy_wins_release_demand, nbtsrv);
        if (!NT_STATUS_IS_OK(status)) {
                task_server_terminate(task, "nbtd failed to setup wins release demand "
                                      "handler", true);
                return;
        }
}