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