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 "rpc_client/rpc_transport.h"
  23 #include "librpc/ndr/ndr_table.h"
  24 #include "libcli/smb/smbXcli_base.h"
  25 #include "libcli/smb/tstream_smbXcli_np.h"
  26 #include "client.h"
  27
  28 #undef DBGC_CLASS
  29 #define DBGC_CLASS DBGC_RPC_CLI
  30
  31 struct rpc_transport_np_init_state {
  32         struct rpc_cli_transport *transport;
  33         int retries;
  34         struct tevent_context *ev;
  35         struct smbXcli_conn *conn;
  36         int timeout;
  37         struct timeval abs_timeout;
  38         const char *pipe_name;
  39         struct smbXcli_session *session;
  40         struct smbXcli_tcon *tcon;
  41         uint16_t pid;
  42 };
  43
  44 static void rpc_transport_np_init_pipe_open(struct tevent_req *subreq);
  45
  46 struct tevent_req *rpc_transport_np_init_send(TALLOC_CTX *mem_ctx,
  47                                               struct tevent_context *ev,
  48                                               struct cli_state *cli,
  49                                               const struct ndr_interface_table *table)
  50 {
  51         struct tevent_req *req;
  52         struct rpc_transport_np_init_state *state;
  53         struct tevent_req *subreq;
  54
  55         req = tevent_req_create(mem_ctx, &state,
  56                                 struct rpc_transport_np_init_state);
  57         if (req == NULL) {
  58                 return NULL;
  59         }
  60
  61         if (smbXcli_conn_protocol(cli->conn) >= PROTOCOL_SMB2_02) {
  62                 state->tcon = cli->smb2.tcon;
  63                 state->session = cli->smb2.session;
  64         } else {
  65                 state->tcon = cli->smb1.tcon;
  66                 state->session = cli->smb1.session;
  67                 state->pid = cli->smb1.pid;
  68         }
  69
  70         state->ev = ev;
  71         state->conn = cli->conn;
  72         state->timeout = cli->timeout;
  73         state->abs_timeout = timeval_current_ofs_msec(cli->timeout);
  74         state->pipe_name = dcerpc_default_transport_endpoint(state, NCACN_NP,
  75                                                              table);
  76         if (tevent_req_nomem(state->pipe_name, req)) {
  77                 return tevent_req_post(req, ev);
  78         }
  79
  80         while (state->pipe_name[0] == '\\') {
  81                 state->pipe_name++;
  82         }
  83
  84         subreq = tstream_smbXcli_np_open_send(state, ev, state->conn,
  85                                               state->session, state->tcon,
  86                                               state->pid, state->timeout,
  87                                               state->pipe_name);
  88         if (tevent_req_nomem(subreq, req)) {
  89                 return tevent_req_post(req, ev);
  90         }
  91         tevent_req_set_callback(subreq, rpc_transport_np_init_pipe_open, req);
  92
  93         return req;
  94 }
  95
  96 static void rpc_transport_np_init_pipe_open_retry(struct tevent_context *ev,
  97                                                   struct tevent_timer *te,
  98                                                   struct timeval t,
  99                                                   void *priv_data)
 100 {
 101         struct tevent_req *subreq;
 102         struct tevent_req *req = talloc_get_type(priv_data, struct tevent_req);
 103         struct rpc_transport_np_init_state *state = tevent_req_data(
 104                 req, struct rpc_transport_np_init_state);
 105
 106         subreq = tstream_smbXcli_np_open_send(state, ev,
 107                                               state->conn,
 108                                               state->session,
 109                                               state->tcon,
 110                                               state->pid,
 111                                               state->timeout,
 112                                               state->pipe_name);
 113         if (tevent_req_nomem(subreq, req)) {
 114                 return;
 115         }
 116         tevent_req_set_callback(subreq, rpc_transport_np_init_pipe_open, req);
 117         state->retries++;
 118 }
 119
 120 static void rpc_transport_np_init_pipe_open(struct tevent_req *subreq)
 121 {
 122         struct tevent_req *req = tevent_req_callback_data(
 123                 subreq, struct tevent_req);
 124         struct rpc_transport_np_init_state *state = tevent_req_data(
 125                 req, struct rpc_transport_np_init_state);
 126         NTSTATUS status;
 127         struct tstream_context *stream;
 128
 129         status = tstream_smbXcli_np_open_recv(subreq, state, &stream);
 130         TALLOC_FREE(subreq);
 131         if (NT_STATUS_EQUAL(status, NT_STATUS_PIPE_NOT_AVAILABLE)
 132                                 && (!timeval_expired(&state->abs_timeout))) {
 133                 struct tevent_timer *te;
 134                 /*
 135                  * Retry on STATUS_PIPE_NOT_AVAILABLE, Windows starts some
 136                  * servers (FssagentRpc) on demand.
 137                  */
 138                 DEBUG(2, ("RPC pipe %s not available, retry %d\n",
 139                           state->pipe_name, state->retries));
 140                 te = tevent_add_timer(state->ev, state,
 141                                  timeval_current_ofs_msec(100 * state->retries),
 142                                  rpc_transport_np_init_pipe_open_retry, req);
 143                 if (tevent_req_nomem(te, req)) {
 144                         return;
 145                 }
 146                 return;
 147         } else if (!NT_STATUS_IS_OK(status)) {
 148                 tevent_req_nterror(req, status);
 149                 return;
 150         }
 151
 152         status = rpc_transport_tstream_init(state,
 153                                             &stream,
 154                                             &state->transport);
 155         if (!NT_STATUS_IS_OK(status)) {
 156                 tevent_req_nterror(req, status);
 157                 return;
 158         }
 159
 160         tevent_req_done(req);
 161 }
 162
 163 NTSTATUS rpc_transport_np_init_recv(struct tevent_req *req,
 164                                     TALLOC_CTX *mem_ctx,
 165                                     struct rpc_cli_transport **presult)
 166 {
 167         struct rpc_transport_np_init_state *state = tevent_req_data(
 168                 req, struct rpc_transport_np_init_state);
 169         NTSTATUS status;
 170
 171         if (tevent_req_is_nterror(req, &status)) {
 172                 return status;
 173         }
 174
 175         *presult = talloc_move(mem_ctx, &state->transport);
 176         return NT_STATUS_OK;
 177 }
 178
 179 NTSTATUS rpc_transport_np_init(TALLOC_CTX *mem_ctx, struct cli_state *cli,
 180                                const struct ndr_interface_table *table,
 181                                struct rpc_cli_transport **presult)
 182 {
 183         TALLOC_CTX *frame = talloc_stackframe();
 184         struct tevent_context *ev;
 185         struct tevent_req *req;
 186         NTSTATUS status = NT_STATUS_OK;
 187
 188         ev = samba_tevent_context_init(frame);
 189         if (ev == NULL) {
 190                 status = NT_STATUS_NO_MEMORY;
 191                 goto fail;
 192         }
 193
 194         req = rpc_transport_np_init_send(frame, ev, cli, table);
 195         if (req == NULL) {
 196                 status = NT_STATUS_NO_MEMORY;
 197                 goto fail;
 198         }
 199
 200         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 201                 goto fail;
 202         }
 203
 204         status = rpc_transport_np_init_recv(req, mem_ctx, presult);
 205  fail:
 206         TALLOC_FREE(frame);
 207         return status;
 208 }