source3/rpc_client/rpc_transport_np.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  RPC client transport over named pipes
   4  *  Copyright (C) Volker Lendecke 2009
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "includes.h"
  21 #include "../lib/util/tevent_ntstatus.h"
  22 #include "librpc/rpc/dcerpc_util.h"
  23 #include "rpc_client/rpc_transport.h"
  24 #include "librpc/ndr/ndr_table.h"
  25 #include "libcli/smb/smbXcli_base.h"
  26 #include "libcli/smb/tstream_smbXcli_np.h"
  27 #include "client.h"
  28
  29 #undef DBGC_CLASS
  30 #define DBGC_CLASS DBGC_RPC_CLI
  31
  32 struct rpc_transport_np_init_state {
  33         struct rpc_cli_transport *transport;
  34         int retries;
  35         struct tevent_context *ev;
  36         struct smbXcli_conn *conn;
  37         int timeout;
  38         struct timeval abs_timeout;
  39         const char *pipe_name;
  40         struct smbXcli_session *session;
  41         struct smbXcli_tcon *tcon;
  42         uint16_t pid;
  43 };
  44
  45 static void rpc_transport_np_init_pipe_open(struct tevent_req *subreq);
  46
  47 struct tevent_req *rpc_transport_np_init_send(TALLOC_CTX *mem_ctx,
  48                                               struct tevent_context *ev,
  49                                               struct cli_state *cli,
  50                                               const struct ndr_interface_table *table)
  51 {
  52         struct tevent_req *req;
  53         struct rpc_transport_np_init_state *state;
  54         struct tevent_req *subreq;
  55
  56         req = tevent_req_create(mem_ctx, &state,
  57                                 struct rpc_transport_np_init_state);
  58         if (req == NULL) {
  59                 return NULL;
  60         }
  61
  62         if (smbXcli_conn_protocol(cli->conn) >= PROTOCOL_SMB2_02) {
  63                 state->tcon = cli->smb2.tcon;
  64                 state->session = cli->smb2.session;
  65         } else {
  66                 state->tcon = cli->smb1.tcon;
  67                 state->session = cli->smb1.session;
  68                 state->pid = cli->smb1.pid;
  69         }
  70
  71         state->ev = ev;
  72         state->conn = cli->conn;
  73         state->timeout = cli->timeout;
  74         state->abs_timeout = timeval_current_ofs_msec(cli->timeout);
  75         state->pipe_name = dcerpc_default_transport_endpoint(state, NCACN_NP,
  76                                                              table);
  77         if (tevent_req_nomem(state->pipe_name, req)) {
  78                 return tevent_req_post(req, ev);
  79         }
  80
  81         while (state->pipe_name[0] == '\\') {
  82                 state->pipe_name++;
  83         }
  84
  85         subreq = tstream_smbXcli_np_open_send(state, ev, state->conn,
  86                                               state->session, state->tcon,
  87                                               state->pid, state->timeout,
  88                                               state->pipe_name);
  89         if (tevent_req_nomem(subreq, req)) {
  90                 return tevent_req_post(req, ev);
  91         }
  92         tevent_req_set_callback(subreq, rpc_transport_np_init_pipe_open, req);
  93
  94         return req;
  95 }
  96
  97 static void rpc_transport_np_init_pipe_open_retry(struct tevent_context *ev,
  98                                                   struct tevent_timer *te,
  99                                                   struct timeval t,
 100                                                   void *priv_data)
 101 {
 102         struct tevent_req *subreq;
 103         struct tevent_req *req = talloc_get_type(priv_data, struct tevent_req);
 104         struct rpc_transport_np_init_state *state = tevent_req_data(
 105                 req, struct rpc_transport_np_init_state);
 106
 107         subreq = tstream_smbXcli_np_open_send(state, ev,
 108                                               state->conn,
 109                                               state->session,
 110                                               state->tcon,
 111                                               state->pid,
 112                                               state->timeout,
 113                                               state->pipe_name);
 114         if (tevent_req_nomem(subreq, req)) {
 115                 return;
 116         }
 117         tevent_req_set_callback(subreq, rpc_transport_np_init_pipe_open, req);
 118         state->retries++;
 119 }
 120
 121 static void rpc_transport_np_init_pipe_open(struct tevent_req *subreq)
 122 {
 123         struct tevent_req *req = tevent_req_callback_data(
 124                 subreq, struct tevent_req);
 125         struct rpc_transport_np_init_state *state = tevent_req_data(
 126                 req, struct rpc_transport_np_init_state);
 127         NTSTATUS status;
 128         struct tstream_context *stream;
 129
 130         status = tstream_smbXcli_np_open_recv(subreq, state, &stream);
 131         TALLOC_FREE(subreq);
 132         if (NT_STATUS_EQUAL(status, NT_STATUS_PIPE_NOT_AVAILABLE)
 133                                 && (!timeval_expired(&state->abs_timeout))) {
 134                 struct tevent_timer *te;
 135                 /*
 136                  * Retry on STATUS_PIPE_NOT_AVAILABLE, Windows starts some
 137                  * servers (FssagentRpc) on demand.
 138                  */
 139                 DEBUG(2, ("RPC pipe %s not available, retry %d\n",
 140                           state->pipe_name, state->retries));
 141                 te = tevent_add_timer(state->ev, state,
 142                                  timeval_current_ofs_msec(100 * state->retries),
 143                                  rpc_transport_np_init_pipe_open_retry, req);
 144                 if (tevent_req_nomem(te, req)) {
 145                         DEBUG(2, ("Failed to create asynchronous "
 146                                         "tevent_timer"));
 147                 }
 148                 return;
 149         }
 150
 151         if (tevent_req_nterror(req, status)) {
 152                 return;
 153         }
 154
 155         status = rpc_transport_tstream_init(state,
 156                                             &stream,
 157                                             &state->transport);
 158         if (tevent_req_nterror(req, status)) {
 159                 return;
 160         }
 161
 162         tevent_req_done(req);
 163 }
 164
 165 NTSTATUS rpc_transport_np_init_recv(struct tevent_req *req,
 166                                     TALLOC_CTX *mem_ctx,
 167                                     struct rpc_cli_transport **presult)
 168 {
 169         struct rpc_transport_np_init_state *state = tevent_req_data(
 170                 req, struct rpc_transport_np_init_state);
 171         NTSTATUS status;
 172
 173         if (tevent_req_is_nterror(req, &status)) {
 174                 return status;
 175         }
 176
 177         *presult = talloc_move(mem_ctx, &state->transport);
 178         return NT_STATUS_OK;
 179 }