source4/libcli/smb_composite/fetchfile.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Copyright (C) Volker Lendecke 2005
   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   a composite API for loading a whole file into memory
  21 */
  22
  23 #include "includes.h"
  24 #include "libcli/composite/composite.h"
  25 #include "libcli/smb_composite/smb_composite.h"
  26
  27 enum fetchfile_stage {FETCHFILE_CONNECT,
  28                       FETCHFILE_READ};
  29
  30 struct fetchfile_state {
  31         enum fetchfile_stage stage;
  32         struct smb_composite_fetchfile *io;
  33         struct composite_context *creq;
  34         struct smb_composite_connect *connect;
  35         struct smb_composite_loadfile *loadfile;
  36 };
  37
  38 static void fetchfile_composite_handler(struct composite_context *req);
  39
  40 static NTSTATUS fetchfile_connect(struct composite_context *c,
  41                                   struct smb_composite_fetchfile *io)
  42 {
  43         NTSTATUS status;
  44         struct fetchfile_state *state;
  45         state = talloc_get_type(c->private_data, struct fetchfile_state);
  46
  47         status = smb_composite_connect_recv(state->creq, c);
  48         NT_STATUS_NOT_OK_RETURN(status);
  49
  50         state->loadfile = talloc(state, struct smb_composite_loadfile);
  51         NT_STATUS_HAVE_NO_MEMORY(state->loadfile);
  52
  53         state->loadfile->in.fname = io->in.filename;
  54
  55         state->creq = smb_composite_loadfile_send(state->connect->out.tree,
  56                                                  state->loadfile);
  57         NT_STATUS_HAVE_NO_MEMORY(state->creq);
  58
  59         state->creq->async.private_data = c;
  60         state->creq->async.fn = fetchfile_composite_handler;
  61
  62         state->stage = FETCHFILE_READ;
  63         c->event_ctx = talloc_reference(c, state->creq->event_ctx);
  64
  65         return NT_STATUS_OK;
  66 }
  67
  68 static NTSTATUS fetchfile_read(struct composite_context *c,
  69                                struct smb_composite_fetchfile *io)
  70 {
  71         NTSTATUS status;
  72         struct fetchfile_state *state;
  73         state = talloc_get_type(c->private_data, struct fetchfile_state);
  74
  75         status = smb_composite_loadfile_recv(state->creq, NULL);
  76         NT_STATUS_NOT_OK_RETURN(status);
  77
  78         io->out.data = state->loadfile->out.data;
  79         io->out.size = state->loadfile->out.size;
  80
  81         c->state = COMPOSITE_STATE_DONE;
  82         if (c->async.fn)
  83                 c->async.fn(c);
  84
  85         return NT_STATUS_OK;
  86 }
  87
  88 static void fetchfile_state_handler(struct composite_context *c)
  89 {
  90         struct fetchfile_state *state;
  91         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
  92
  93         state = talloc_get_type(c->private_data, struct fetchfile_state);
  94
  95         /* when this handler is called, the stage indicates what
  96            call has just finished */
  97         switch (state->stage) {
  98         case FETCHFILE_CONNECT:
  99                 status = fetchfile_connect(c, state->io);
 100                 break;
 101         case FETCHFILE_READ:
 102                 status = fetchfile_read(c, state->io);
 103                 break;
 104         }
 105
 106         if (!NT_STATUS_IS_OK(status)) {
 107                 c->status = status;
 108                 c->state = COMPOSITE_STATE_ERROR;
 109                 if (c->async.fn) {
 110                         c->async.fn(c);
 111                 }
 112         }
 113 }
 114
 115 static void fetchfile_composite_handler(struct composite_context *creq)
 116 {
 117         struct composite_context *c = talloc_get_type(creq->async.private_data,
 118                                                       struct composite_context);
 119         fetchfile_state_handler(c);
 120 }
 121
 122 struct composite_context *smb_composite_fetchfile_send(struct smb_composite_fetchfile *io,
 123                                                        struct event_context *event_ctx)
 124 {
 125         struct composite_context *c;
 126         struct fetchfile_state *state;
 127
 128         c = talloc_zero(NULL, struct composite_context);
 129         if (c == NULL) goto failed;
 130
 131         state = talloc(c, struct fetchfile_state);
 132         if (state == NULL) goto failed;
 133
 134         state->connect = talloc(state, struct smb_composite_connect);
 135         if (state->connect == NULL) goto failed;
 136
 137         state->io = io;
 138
 139         state->connect->in.dest_host    = io->in.dest_host;
 140         state->connect->in.port         = io->in.port;
 141         state->connect->in.called_name  = io->in.called_name;
 142         state->connect->in.service      = io->in.service;
 143         state->connect->in.service_type = io->in.service_type;
 144         state->connect->in.credentials  = io->in.credentials;
 145         state->connect->in.fallback_to_anonymous = False;
 146         state->connect->in.workgroup    = io->in.workgroup;
 147
 148         state->creq = smb_composite_connect_send(state->connect, state, event_ctx);
 149         if (state->creq == NULL) goto failed;
 150
 151         state->creq->async.private_data = c;
 152         state->creq->async.fn = fetchfile_composite_handler;
 153
 154         c->state = COMPOSITE_STATE_IN_PROGRESS;
 155         state->stage = FETCHFILE_CONNECT;
 156         c->event_ctx = talloc_reference(c, state->creq->event_ctx);
 157         c->private_data = state;
 158
 159         return c;
 160  failed:
 161         talloc_free(c);
 162         return NULL;
 163 }
 164
 165 NTSTATUS smb_composite_fetchfile_recv(struct composite_context *c,
 166                                       TALLOC_CTX *mem_ctx)
 167 {
 168         NTSTATUS status;
 169
 170         status = composite_wait(c);
 171
 172         if (NT_STATUS_IS_OK(status)) {
 173                 struct fetchfile_state *state = talloc_get_type(c->private_data, struct fetchfile_state);
 174                 talloc_steal(mem_ctx, state->io->out.data);
 175         }
 176
 177         talloc_free(c);
 178         return status;
 179 }
 180
 181 NTSTATUS smb_composite_fetchfile(struct smb_composite_fetchfile *io,
 182                                  TALLOC_CTX *mem_ctx)
 183 {
 184         struct composite_context *c = smb_composite_fetchfile_send(io, NULL);
 185         return smb_composite_fetchfile_recv(c, mem_ctx);
 186 }