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 #include "param/param.h"
  27 #include "libcli/resolve/resolve.h"
  28
  29 enum fetchfile_stage {FETCHFILE_CONNECT,
  30                       FETCHFILE_READ};
  31
  32 struct fetchfile_state {
  33         enum fetchfile_stage stage;
  34         struct smb_composite_fetchfile *io;
  35         struct composite_context *creq;
  36         struct smb_composite_connect *connect;
  37         struct smb_composite_loadfile *loadfile;
  38 };
  39
  40 static void fetchfile_composite_handler(struct composite_context *req);
  41
  42 static NTSTATUS fetchfile_connect(struct composite_context *c,
  43                                   struct smb_composite_fetchfile *io)
  44 {
  45         NTSTATUS status;
  46         struct fetchfile_state *state;
  47         state = talloc_get_type(c->private_data, struct fetchfile_state);
  48
  49         status = smb_composite_connect_recv(state->creq, c);
  50         NT_STATUS_NOT_OK_RETURN(status);
  51
  52         state->loadfile = talloc(state, struct smb_composite_loadfile);
  53         NT_STATUS_HAVE_NO_MEMORY(state->loadfile);
  54
  55         state->loadfile->in.fname = io->in.filename;
  56
  57         state->creq = smb_composite_loadfile_send(state->connect->out.tree,
  58                                                  state->loadfile);
  59         NT_STATUS_HAVE_NO_MEMORY(state->creq);
  60
  61         state->creq->async.private_data = c;
  62         state->creq->async.fn = fetchfile_composite_handler;
  63
  64         state->stage = FETCHFILE_READ;
  65
  66         return NT_STATUS_OK;
  67 }
  68
  69 static NTSTATUS fetchfile_read(struct composite_context *c,
  70                                struct smb_composite_fetchfile *io)
  71 {
  72         NTSTATUS status;
  73         struct fetchfile_state *state;
  74         state = talloc_get_type(c->private_data, struct fetchfile_state);
  75
  76         status = smb_composite_loadfile_recv(state->creq, NULL);
  77         NT_STATUS_NOT_OK_RETURN(status);
  78
  79         io->out.data = state->loadfile->out.data;
  80         io->out.size = state->loadfile->out.size;
  81
  82         c->state = COMPOSITE_STATE_DONE;
  83         if (c->async.fn)
  84                 c->async.fn(c);
  85
  86         return NT_STATUS_OK;
  87 }
  88
  89 static void fetchfile_state_handler(struct composite_context *c)
  90 {
  91         struct fetchfile_state *state;
  92         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
  93
  94         state = talloc_get_type(c->private_data, struct fetchfile_state);
  95
  96         /* when this handler is called, the stage indicates what
  97            call has just finished */
  98         switch (state->stage) {
  99         case FETCHFILE_CONNECT:
 100                 status = fetchfile_connect(c, state->io);
 101                 break;
 102         case FETCHFILE_READ:
 103                 status = fetchfile_read(c, state->io);
 104                 break;
 105         }
 106
 107         if (!NT_STATUS_IS_OK(status)) {
 108                 c->status = status;
 109                 c->state = COMPOSITE_STATE_ERROR;
 110                 if (c->async.fn) {
 111                         c->async.fn(c);
 112                 }
 113         }
 114 }
 115
 116 static void fetchfile_composite_handler(struct composite_context *creq)
 117 {
 118         struct composite_context *c = talloc_get_type(creq->async.private_data,
 119                                                       struct composite_context);
 120         fetchfile_state_handler(c);
 121 }
 122
 123 struct composite_context *smb_composite_fetchfile_send(struct smb_composite_fetchfile *io,
 124                                                        struct event_context *event_ctx)
 125 {
 126         struct composite_context *c;
 127         struct fetchfile_state *state;
 128
 129         c = talloc_zero(NULL, struct composite_context);
 130         if (c == NULL) goto failed;
 131
 132         state = talloc(c, struct fetchfile_state);
 133         if (state == NULL) goto failed;
 134
 135         state->connect = talloc(state, struct smb_composite_connect);
 136         if (state->connect == NULL) goto failed;
 137
 138         state->io = io;
 139
 140         state->connect->in.dest_host    = io->in.dest_host;
 141         state->connect->in.dest_ports   = io->in.ports;
 142         state->connect->in.called_name  = io->in.called_name;
 143         state->connect->in.service      = io->in.service;
 144         state->connect->in.service_type = io->in.service_type;
 145         state->connect->in.credentials  = io->in.credentials;
 146         state->connect->in.fallback_to_anonymous = false;
 147         state->connect->in.workgroup    = io->in.workgroup;
 148
 149         state->connect->in.options      = io->in.options;
 150         state->connect->in.session_options = io->in.session_options;
 151
 152         state->creq = smb_composite_connect_send(state->connect, state,
 153                                                  io->in.resolve_ctx, event_ctx);
 154         if (state->creq == NULL) goto failed;
 155
 156         state->creq->async.private_data = c;
 157         state->creq->async.fn = fetchfile_composite_handler;
 158
 159         c->state = COMPOSITE_STATE_IN_PROGRESS;
 160         state->stage = FETCHFILE_CONNECT;
 161         c->private_data = state;
 162
 163         return c;
 164  failed:
 165         talloc_free(c);
 166         return NULL;
 167 }
 168
 169 NTSTATUS smb_composite_fetchfile_recv(struct composite_context *c,
 170                                       TALLOC_CTX *mem_ctx)
 171 {
 172         NTSTATUS status;
 173
 174         status = composite_wait(c);
 175
 176         if (NT_STATUS_IS_OK(status)) {
 177                 struct fetchfile_state *state = talloc_get_type(c->private_data, struct fetchfile_state);
 178                 talloc_steal(mem_ctx, state->io->out.data);
 179         }
 180
 181         talloc_free(c);
 182         return status;
 183 }
 184
 185 NTSTATUS smb_composite_fetchfile(struct smb_composite_fetchfile *io,
 186                                  TALLOC_CTX *mem_ctx)
 187 {
 188         struct composite_context *c = smb_composite_fetchfile_send(io, NULL);
 189         return smb_composite_fetchfile_recv(c, mem_ctx);
 190 }