source3/libsmb/async_smb.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Infrastructure for async SMB client requests
   4    Copyright (C) Volker Lendecke 2008
   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 "libsmb/libsmb.h"
  22 #include "../lib/util/tevent_ntstatus.h"
  23 #include "async_smb.h"
  24 #include "../libcli/smb/smbXcli_base.h"
  25
  26 struct cli_smb_req_state {
  27         struct cli_state *cli;
  28         uint8_t smb_command;
  29         struct tevent_req *req;
  30         struct cli_smb_req_state **ptr;
  31 };
  32
  33 static int cli_smb_req_state_destructor(struct cli_smb_req_state *state)
  34 {
  35         talloc_set_destructor(state->ptr, NULL);
  36         talloc_free(state->ptr);
  37         return 0;
  38 }
  39
  40 static int cli_smb_req_state_ptr_destructor(struct cli_smb_req_state **ptr)
  41 {
  42         struct cli_smb_req_state *state = *ptr;
  43         void *parent = talloc_parent(state);
  44
  45         talloc_set_destructor(state, NULL);
  46
  47         talloc_reparent(state, parent, state->req);
  48         talloc_free(state);
  49         return 0;
  50 }
  51
  52 struct tevent_req *cli_smb_req_create(TALLOC_CTX *mem_ctx,
  53                                       struct tevent_context *ev,
  54                                       struct cli_state *cli,
  55                                       uint8_t smb_command,
  56                                       uint8_t additional_flags,
  57                                       uint8_t wct, uint16_t *vwv,
  58                                       int iov_count,
  59                                       struct iovec *bytes_iov)
  60 {
  61         struct cli_smb_req_state *state;
  62         uint8_t clear_flags = 0;
  63         uint16_t additional_flags2 = 0;
  64         uint16_t clear_flags2 = 0;
  65
  66         state = talloc_zero(mem_ctx, struct cli_smb_req_state);
  67         if (state == NULL) {
  68                 return NULL;
  69         }
  70         state->cli = cli;
  71         state->smb_command = smb_command;
  72         state->ptr = talloc(state, struct cli_smb_req_state *);
  73         if (state->ptr == NULL) {
  74                 talloc_free(state);
  75                 return NULL;
  76         }
  77         *state->ptr = state;
  78
  79         if (cli->case_sensitive) {
  80                 clear_flags |= FLAG_CASELESS_PATHNAMES;
  81         } else {
  82                 /* Default setting, case insensitive. */
  83                 additional_flags |= FLAG_CASELESS_PATHNAMES;
  84         }
  85
  86         if (smbXcli_conn_dfs_supported(cli->conn) && cli->dfsroot) {
  87                 additional_flags2 |= FLAGS2_DFS_PATHNAMES;
  88         }
  89
  90         state->req = smb1cli_req_create(state, ev, cli->conn, smb_command,
  91                                         additional_flags, clear_flags,
  92                                         additional_flags2, clear_flags2,
  93                                         cli->timeout,
  94                                         cli->smb1.pid,
  95                                         cli->smb1.tcon,
  96                                         cli->smb1.session,
  97                                         wct, vwv, iov_count, bytes_iov);
  98         if (state->req == NULL) {
  99                 talloc_free(state);
 100                 return NULL;
 101         }
 102
 103         talloc_reparent(state, state->req, state->ptr);
 104         talloc_set_destructor(state, cli_smb_req_state_destructor);
 105         talloc_set_destructor(state->ptr, cli_smb_req_state_ptr_destructor);
 106
 107         return state->req;
 108 }
 109
 110 struct tevent_req *cli_smb_send(TALLOC_CTX *mem_ctx,
 111                                 struct tevent_context *ev,
 112                                 struct cli_state *cli,
 113                                 uint8_t smb_command,
 114                                 uint8_t additional_flags,
 115                                 uint8_t wct, uint16_t *vwv,
 116                                 uint32_t num_bytes,
 117                                 const uint8_t *bytes)
 118 {
 119         struct cli_smb_req_state *state;
 120         uint8_t clear_flags = 0;
 121         uint16_t additional_flags2 = 0;
 122         uint16_t clear_flags2 = 0;
 123
 124         state = talloc_zero(mem_ctx, struct cli_smb_req_state);
 125         if (state == NULL) {
 126                 return NULL;
 127         }
 128         state->cli = cli;
 129         state->smb_command = smb_command;
 130         state->ptr = talloc(state, struct cli_smb_req_state *);
 131         if (state->ptr == NULL) {
 132                 talloc_free(state);
 133                 return NULL;
 134         }
 135         *state->ptr = state;
 136
 137         if (cli->case_sensitive) {
 138                 clear_flags |= FLAG_CASELESS_PATHNAMES;
 139         } else {
 140                 /* Default setting, case insensitive. */
 141                 additional_flags |= FLAG_CASELESS_PATHNAMES;
 142         }
 143
 144         if (smbXcli_conn_dfs_supported(cli->conn) && cli->dfsroot) {
 145                 additional_flags2 |= FLAGS2_DFS_PATHNAMES;
 146         }
 147
 148         state->req = smb1cli_req_send(state, ev, cli->conn, smb_command,
 149                                 additional_flags, clear_flags,
 150                                 additional_flags2, clear_flags2,
 151                                 cli->timeout,
 152                                 cli->smb1.pid,
 153                                 cli->smb1.tcon,
 154                                 cli->smb1.session,
 155                                 wct, vwv, num_bytes, bytes);
 156         if (state->req == NULL) {
 157                 talloc_free(state);
 158                 return NULL;
 159         }
 160
 161         talloc_reparent(state, state->req, state->ptr);
 162         talloc_set_destructor(state, cli_smb_req_state_destructor);
 163         talloc_set_destructor(state->ptr, cli_smb_req_state_ptr_destructor);
 164
 165         return state->req;
 166 }
 167
 168 NTSTATUS cli_smb_recv(struct tevent_req *req,
 169                       TALLOC_CTX *mem_ctx, uint8_t **pinbuf,
 170                       uint8_t min_wct, uint8_t *pwct, uint16_t **pvwv,
 171                       uint32_t *pnum_bytes, uint8_t **pbytes)
 172 {
 173         NTSTATUS status;
 174         void *parent = talloc_parent(req);
 175         struct cli_smb_req_state *state =
 176                 talloc_get_type(parent,
 177                 struct cli_smb_req_state);
 178         struct iovec *recv_iov = NULL;
 179         uint8_t wct = 0;
 180         uint16_t *vwv = NULL;
 181         uint32_t num_bytes;
 182         uint8_t *bytes = NULL;
 183         uint8_t *inbuf;
 184         bool is_expected = false;
 185         bool map_dos_errors = true;
 186
 187         if (pinbuf != NULL) {
 188                 *pinbuf = NULL;
 189         }
 190         if (pwct != NULL) {
 191                 *pwct = 0;
 192         }
 193         if (pvwv != NULL) {
 194                 *pvwv = NULL;
 195         }
 196         if (pnum_bytes != NULL) {
 197                 *pnum_bytes = 0;
 198         }
 199         if (pbytes != NULL) {
 200                 *pbytes = NULL;
 201         }
 202
 203         status = smb1cli_req_recv(req, req,
 204                                   &recv_iov,
 205                                   NULL, /* phdr */
 206                                   &wct,
 207                                   &vwv,
 208                                   NULL, /* pvwv_offset */
 209                                   &num_bytes,
 210                                   &bytes,
 211                                   NULL, /* pbytes_offset */
 212                                   &inbuf,
 213                                   NULL, 0); /* expected */
 214
 215         if (state) {
 216                 if ((state->smb_command == SMBsesssetupX) &&
 217                      NT_STATUS_EQUAL(status,
 218                                 NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 219                         /*
 220                          * NT_STATUS_MORE_PROCESSING_REQUIRED is a
 221                          * valid return code for session setup
 222                          */
 223                         is_expected = true;
 224                 }
 225
 226                 map_dos_errors = state->cli->map_dos_errors;
 227                 state->cli->raw_status = status;
 228                 talloc_free(state->ptr);
 229                 state = NULL;
 230         }
 231
 232         if (NT_STATUS_IS_DOS(status) && map_dos_errors) {
 233                 uint8_t eclass = NT_STATUS_DOS_CLASS(status);
 234                 uint16_t ecode = NT_STATUS_DOS_CODE(status);
 235                 /*
 236                  * TODO: is it really a good idea to do a mapping here?
 237                  *
 238                  * The old cli_pull_error() also does it, so I do not change
 239                  * the behavior yet.
 240                  */
 241                 status = dos_to_ntstatus(eclass, ecode);
 242         }
 243
 244         if (!NT_STATUS_IS_ERR(status)) {
 245                 is_expected = true;
 246         }
 247
 248         if (!is_expected) {
 249                 TALLOC_FREE(recv_iov);
 250                 return status;
 251         }
 252
 253         if (wct < min_wct) {
 254                 TALLOC_FREE(recv_iov);
 255                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 256         }
 257
 258         if (pwct != NULL) {
 259                 *pwct = wct;
 260         }
 261         if (pvwv != NULL) {
 262                 *pvwv = vwv;
 263         }
 264         if (pnum_bytes != NULL) {
 265                 *pnum_bytes = num_bytes;
 266         }
 267         if (pbytes != NULL) {
 268                 *pbytes = bytes;
 269         }
 270
 271         if (pinbuf != NULL && mem_ctx != NULL) {
 272                 if (talloc_reference_count(inbuf) == 0) {
 273                         *pinbuf = talloc_move(mem_ctx, &inbuf);
 274                         TALLOC_FREE(recv_iov);
 275                 } else {
 276                         *pinbuf = inbuf;
 277                 }
 278         } else if (mem_ctx != NULL) {
 279                 if (talloc_reference_count(inbuf) == 0) {
 280                         (void)talloc_move(mem_ctx, &inbuf);
 281                         TALLOC_FREE(recv_iov);
 282                 }
 283         }
 284
 285         return status;
 286 }