source4/smb_server/smb2/find.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB2 Find
   4    Copyright (C) Andrew Tridgell 2003
   5    Copyright (c) Stefan Metzmacher 2006
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20 /*
  21    This file handles the parsing of transact2 requests
  22 */
  23
  24 #include "includes.h"
  25 #include "libcli/smb2/smb2.h"
  26 #include "libcli/smb2/smb2_calls.h"
  27 #include "smb_server/smb_server.h"
  28 #include "smb_server/service_smb_proto.h"
  29 #include "smb_server/smb2/smb2_server.h"
  30 #include "ntvfs/ntvfs.h"
  31
  32
  33 /* a structure to encapsulate the state information about an in-progress ffirst/fnext operation */
  34 struct smb2srv_find_state {
  35         struct smb2srv_request *req;
  36         struct smb2_find *info;
  37         union smb_search_first *ff;
  38         union smb_search_next *fn;
  39         uint32_t last_entry_offset;
  40 };
  41
  42 /* callback function for SMB2 Find */
  43 static bool smb2srv_find_callback(void *private, const union smb_search_data *file)
  44 {
  45         struct smb2srv_find_state *state = talloc_get_type(private, struct smb2srv_find_state);
  46         struct smb2_find *info = state->info;
  47         uint32_t old_length;
  48         NTSTATUS status;
  49
  50         old_length = info->out.blob.length;
  51
  52         status = smbsrv_push_passthru_search(state, &info->out.blob, info->data_level, file, STR_UNICODE);
  53         if (!NT_STATUS_IS_OK(status) ||
  54             info->out.blob.length > info->in.max_response_size) {
  55                 /* restore the old length and tell the backend to stop */
  56                 smbsrv_blob_grow_data(state, &info->out.blob, old_length);
  57                 return false;
  58         }
  59
  60         state->last_entry_offset = old_length;
  61
  62         return true;
  63 }
  64
  65 static void smb2srv_find_send(struct ntvfs_request *ntvfs)
  66 {
  67         struct smb2srv_request *req;
  68         struct smb2srv_find_state *state;
  69
  70         SMB2SRV_CHECK_ASYNC_STATUS(state, struct smb2srv_find_state);
  71         SMB2SRV_CHECK(smb2srv_setup_reply(req, 0x08, true, state->info->out.blob.length));
  72
  73         if (state->info->out.blob.length > 0) {
  74                 SIVAL(state->info->out.blob.data + state->last_entry_offset, 0, 0);
  75         }
  76
  77         SMB2SRV_CHECK(smb2_push_o16s32_blob(&req->out, 0x02, state->info->out.blob));
  78
  79         smb2srv_send_reply(req);
  80 }
  81
  82 static NTSTATUS smb2srv_find_backend(struct smb2srv_find_state *state)
  83 {
  84         struct smb2_find *info = state->info;
  85
  86         switch (info->in.level) {
  87         case SMB2_FIND_DIRECTORY_INFO:
  88                 info->data_level = RAW_SEARCH_DATA_DIRECTORY_INFO;
  89                 break;
  90
  91         case SMB2_FIND_FULL_DIRECTORY_INFO:
  92                 info->data_level = RAW_SEARCH_DATA_FULL_DIRECTORY_INFO;
  93                 break;
  94
  95         case SMB2_FIND_BOTH_DIRECTORY_INFO:
  96                 info->data_level = RAW_SEARCH_DATA_BOTH_DIRECTORY_INFO;
  97                 break;
  98
  99         case SMB2_FIND_NAME_INFO:
 100                 info->data_level = RAW_SEARCH_DATA_NAME_INFO;
 101                 break;
 102
 103         case SMB2_FIND_ID_BOTH_DIRECTORY_INFO:
 104                 info->data_level = RAW_SEARCH_DATA_ID_BOTH_DIRECTORY_INFO;
 105                 break;
 106
 107         case SMB2_FIND_ID_FULL_DIRECTORY_INFO:
 108                 info->data_level = RAW_SEARCH_DATA_ID_FULL_DIRECTORY_INFO;
 109                 break;
 110
 111         default:
 112                 return NT_STATUS_FOOBAR;
 113         }
 114
 115         if (info->in.continue_flags & SMB2_CONTINUE_FLAG_REOPEN) {
 116                 state->ff = talloc(state, union smb_search_first);
 117                 NT_STATUS_HAVE_NO_MEMORY(state->ff);
 118
 119                 state->ff->smb2 = *info;
 120                 state->info = &state->ff->smb2;
 121                 ZERO_STRUCT(state->ff->smb2.out);
 122
 123                 return ntvfs_search_first(state->req->ntvfs, state->ff, state, smb2srv_find_callback);
 124         } else {
 125                 state->fn = talloc(state, union smb_search_next);
 126                 NT_STATUS_HAVE_NO_MEMORY(state->fn);
 127
 128                 state->fn->smb2 = *info;
 129                 state->info = &state->fn->smb2;
 130                 ZERO_STRUCT(state->fn->smb2.out);
 131
 132                 return ntvfs_search_next(state->req->ntvfs, state->fn, state, smb2srv_find_callback);
 133         }
 134
 135         /* should not be reached */
 136         return NT_STATUS_INTERNAL_ERROR;
 137 }
 138
 139 void smb2srv_find_recv(struct smb2srv_request *req)
 140 {
 141         struct smb2srv_find_state *state;
 142         struct smb2_find *info;
 143
 144         SMB2SRV_CHECK_BODY_SIZE(req, 0x20, true);
 145         SMB2SRV_TALLOC_IO_PTR(info, struct smb2_find);
 146         /* this overwrites req->io_ptr !*/
 147         SMB2SRV_TALLOC_IO_PTR(state, struct smb2srv_find_state);
 148         state->req              = req;
 149         state->info             = info;
 150         state->ff               = NULL;
 151         state->fn               = NULL;
 152         state->last_entry_offset= 0;
 153         SMB2SRV_SETUP_NTVFS_REQUEST(smb2srv_find_send, NTVFS_ASYNC_STATE_MAY_ASYNC);
 154
 155         info->level                     = RAW_SEARCH_SMB2;
 156         info->data_level                = RAW_SEARCH_DATA_GENERIC;/* will be overwritten later */
 157         info->in.level                  = CVAL(req->in.body, 0x02);
 158         info->in.continue_flags         = CVAL(req->in.body, 0x03);
 159         info->in.file_index             = IVAL(req->in.body, 0x04);
 160         info->in.file.ntvfs             = smb2srv_pull_handle(req, req->in.body, 0x08);
 161         SMB2SRV_CHECK(smb2_pull_o16s16_string(&req->in, info, req->in.body+0x18, &info->in.pattern));
 162         info->in.max_response_size      = IVAL(req->in.body, 0x1C);
 163
 164         /* the VFS backend does not yet handle NULL patterns */
 165         if (info->in.pattern == NULL) {
 166                 info->in.pattern = "";
 167         }
 168
 169         SMB2SRV_CHECK_FILE_HANDLE(info->in.file.ntvfs);
 170         SMB2SRV_CALL_NTVFS_BACKEND(smb2srv_find_backend(state));
 171 }