source3/rpc_client/rpc_transport_sock.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  RPC client transport over a socket
   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
  22 #undef DBGC_CLASS
  23 #define DBGC_CLASS DBGC_RPC_CLI
  24
  25 struct rpc_transport_sock_state {
  26         int fd;
  27 };
  28
  29 static int rpc_transport_sock_state_destructor(struct rpc_transport_sock_state *s)
  30 {
  31         if (s->fd != -1) {
  32                 close(s->fd);
  33                 s->fd = -1;
  34         }
  35         return 0;
  36 }
  37
  38 struct rpc_sock_read_state {
  39         struct rpc_transport_sock_state *transp;
  40         ssize_t received;
  41 };
  42
  43 static void rpc_sock_read_done(struct tevent_req *subreq);
  44
  45 static struct async_req *rpc_sock_read_send(TALLOC_CTX *mem_ctx,
  46                                             struct event_context *ev,
  47                                             uint8_t *data, size_t size,
  48                                             void *priv)
  49 {
  50         struct rpc_transport_sock_state *sock_transp = talloc_get_type_abort(
  51                 priv, struct rpc_transport_sock_state);
  52         struct async_req *result;
  53         struct tevent_req *subreq;
  54         struct rpc_sock_read_state *state;
  55
  56         if (!async_req_setup(mem_ctx, &result, &state,
  57                              struct rpc_sock_read_state)) {
  58                 return NULL;
  59         }
  60         if (sock_transp->fd == -1) {
  61                 if (!async_post_ntstatus(result, ev, NT_STATUS_CONNECTION_INVALID)) {
  62                         goto fail;
  63                 }
  64                 return result;
  65         }
  66         state->transp = sock_transp;
  67         subreq = async_recv_send(state, ev, sock_transp->fd, data, size, 0);
  68         if (subreq == NULL) {
  69                 goto fail;
  70         }
  71         tevent_req_set_callback(subreq, rpc_sock_read_done, result);
  72         return result;
  73  fail:
  74         TALLOC_FREE(result);
  75         return NULL;
  76 }
  77
  78 static void rpc_sock_read_done(struct tevent_req *subreq)
  79 {
  80         struct async_req *req =
  81                 tevent_req_callback_data(subreq, struct async_req);
  82         struct rpc_sock_read_state *state = talloc_get_type_abort(
  83                 req->private_data, struct rpc_sock_read_state);
  84         int err;
  85
  86         /* We must free subreq in this function as there is
  87           a timer event attached to it. */
  88
  89         state->received = async_recv_recv(subreq, &err);
  90
  91         if (state->received == -1) {
  92                 if (err == EPIPE) {
  93                         close(state->transp->fd);
  94                         state->transp->fd = -1;
  95                 }
  96                 TALLOC_FREE(subreq);
  97                 async_req_nterror(req, map_nt_error_from_unix(err));
  98                 return;
  99         }
 100         TALLOC_FREE(subreq);
 101         async_req_done(req);
 102 }
 103
 104 static NTSTATUS rpc_sock_read_recv(struct async_req *req, ssize_t *preceived)
 105 {
 106         struct rpc_sock_read_state *state = talloc_get_type_abort(
 107                 req->private_data, struct rpc_sock_read_state);
 108         NTSTATUS status;
 109
 110         if (async_req_is_nterror(req, &status)) {
 111                 return status;
 112         }
 113         *preceived = state->received;
 114         return NT_STATUS_OK;
 115 }
 116
 117 struct rpc_sock_write_state {
 118         struct rpc_transport_sock_state *transp;
 119         ssize_t sent;
 120 };
 121
 122 static void rpc_sock_write_done(struct tevent_req *subreq);
 123
 124 static struct async_req *rpc_sock_write_send(TALLOC_CTX *mem_ctx,
 125                                              struct event_context *ev,
 126                                              const uint8_t *data, size_t size,
 127                                              void *priv)
 128 {
 129         struct rpc_transport_sock_state *sock_transp = talloc_get_type_abort(
 130                 priv, struct rpc_transport_sock_state);
 131         struct async_req *result;
 132         struct tevent_req *subreq;
 133         struct rpc_sock_write_state *state;
 134
 135         if (!async_req_setup(mem_ctx, &result, &state,
 136                              struct rpc_sock_write_state)) {
 137                 return NULL;
 138         }
 139         if (sock_transp->fd == -1) {
 140                 if (!async_post_ntstatus(result, ev, NT_STATUS_CONNECTION_INVALID)) {
 141                         goto fail;
 142                 }
 143                 return result;
 144         }
 145         state->transp = sock_transp;
 146         subreq = async_send_send(state, ev, sock_transp->fd, data, size, 0);
 147         if (subreq == NULL) {
 148                 goto fail;
 149         }
 150         tevent_req_set_callback(subreq, rpc_sock_write_done, result);
 151         return result;
 152  fail:
 153         TALLOC_FREE(result);
 154         return NULL;
 155 }
 156
 157 static void rpc_sock_write_done(struct tevent_req *subreq)
 158 {
 159         struct async_req *req =
 160                 tevent_req_callback_data(subreq, struct async_req);
 161         struct rpc_sock_write_state *state = talloc_get_type_abort(
 162                 req->private_data, struct rpc_sock_write_state);
 163         int err;
 164
 165         /* We must free subreq in this function as there is
 166           a timer event attached to it. */
 167
 168         state->sent = async_send_recv(subreq, &err);
 169
 170         if (state->sent == -1) {
 171                 if (err == EPIPE) {
 172                         close(state->transp->fd);
 173                         state->transp->fd = -1;
 174                 }
 175                 TALLOC_FREE(subreq);
 176                 async_req_nterror(req, map_nt_error_from_unix(err));
 177                 return;
 178         }
 179         TALLOC_FREE(subreq);
 180         async_req_done(req);
 181 }
 182
 183 static NTSTATUS rpc_sock_write_recv(struct async_req *req, ssize_t *psent)
 184 {
 185         struct rpc_sock_write_state *state = talloc_get_type_abort(
 186                 req->private_data, struct rpc_sock_write_state);
 187         NTSTATUS status;
 188
 189         if (async_req_is_nterror(req, &status)) {
 190                 return status;
 191         }
 192         *psent = state->sent;
 193         return NT_STATUS_OK;
 194 }
 195
 196 NTSTATUS rpc_transport_sock_init(TALLOC_CTX *mem_ctx, int fd,
 197                                  struct rpc_cli_transport **presult)
 198 {
 199         struct rpc_cli_transport *result;
 200         struct rpc_transport_sock_state *state;
 201
 202         result = talloc(mem_ctx, struct rpc_cli_transport);
 203         if (result == NULL) {
 204                 return NT_STATUS_NO_MEMORY;
 205         }
 206         state = talloc(result, struct rpc_transport_sock_state);
 207         if (state == NULL) {
 208                 TALLOC_FREE(result);
 209                 return NT_STATUS_NO_MEMORY;
 210         }
 211         result->priv = state;
 212
 213         state->fd = fd;
 214         talloc_set_destructor(state, rpc_transport_sock_state_destructor);
 215
 216         result->trans_send = NULL;
 217         result->trans_recv = NULL;
 218         result->write_send = rpc_sock_write_send;
 219         result->write_recv = rpc_sock_write_recv;
 220         result->read_send = rpc_sock_read_send;
 221         result->read_recv = rpc_sock_read_recv;
 222
 223         *presult = result;
 224         return NT_STATUS_OK;
 225 }