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         c->event_ctx = talloc_reference(c, state->creq->event_ctx);
  66
  67         return NT_STATUS_OK;
  68 }
  69
  70 static NTSTATUS fetchfile_read(struct composite_context *c,
  71                                struct smb_composite_fetchfile *io)
  72 {
  73         NTSTATUS status;
  74         struct fetchfile_state *state;
  75         state = talloc_get_type(c->private_data, struct fetchfile_state);
  76
  77         status = smb_composite_loadfile_recv(state->creq, NULL);
  78         NT_STATUS_NOT_OK_RETURN(status);
  79
  80         io->out.data = state->loadfile->out.data;
  81         io->out.size = state->loadfile->out.size;
  82
  83         c->state = COMPOSITE_STATE_DONE;
  84         if (c->async.fn)
  85                 c->async.fn(c);
  86
  87         return NT_STATUS_OK;
  88 }
  89
  90 static void fetchfile_state_handler(struct composite_context *c)
  91 {
  92         struct fetchfile_state *state;
  93         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
  94
  95         state = talloc_get_type(c->private_data, struct fetchfile_state);
  96
  97         /* when this handler is called, the stage indicates what
  98            call has just finished */
  99         switch (state->stage) {
 100         case FETCHFILE_CONNECT:
 101                 status = fetchfile_connect(c, state->io);
 102                 break;
 103         case FETCHFILE_READ:
 104                 status = fetchfile_read(c, state->io);
 105                 break;
 106         }
 107
 108         if (!NT_STATUS_IS_OK(status)) {
 109                 c->status = status;
 110                 c->state = COMPOSITE_STATE_ERROR;
 111                 if (c->async.fn) {
 112                         c->async.fn(c);
 113                 }
 114         }
 115 }
 116
 117 static void fetchfile_composite_handler(struct composite_context *creq)
 118 {
 119         struct composite_context *c = talloc_get_type(creq->async.private_data,
 120                                                       struct composite_context);
 121         fetchfile_state_handler(c);
 122 }
 123
 124 struct composite_context *smb_composite_fetchfile_send(struct smb_composite_fetchfile *io,
 125                                                        struct event_context *event_ctx)
 126 {
 127         struct composite_context *c;
 128         struct fetchfile_state *state;
 129
 130         c = talloc_zero(NULL, struct composite_context);
 131         if (c == NULL) goto failed;
 132
 133         state = talloc(c, struct fetchfile_state);
 134         if (state == NULL) goto failed;
 135
 136         state->connect = talloc(state, struct smb_composite_connect);
 137         if (state->connect == NULL) goto failed;
 138
 139         state->io = io;
 140
 141         state->connect->in.dest_host    = io->in.dest_host;
 142         state->connect->in.dest_ports   = io->in.ports;
 143         state->connect->in.called_name  = io->in.called_name;
 144         state->connect->in.service      = io->in.service;
 145         state->connect->in.service_type = io->in.service_type;
 146         state->connect->in.credentials  = io->in.credentials;
 147         state->connect->in.fallback_to_anonymous = false;
 148         state->connect->in.workgroup    = io->in.workgroup;
 149
 150         state->connect->in.options      = io->in.options;
 151
 152         state->creq = smb_composite_connect_send(state->connect, state,
 153                                                  lp_resolve_context(global_loadparm), 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->event_ctx = talloc_reference(c, state->creq->event_ctx);
 162         c->private_data = state;
 163
 164         return c;
 165  failed:
 166         talloc_free(c);
 167         return NULL;
 168 }
 169
 170 NTSTATUS smb_composite_fetchfile_recv(struct composite_context *c,
 171                                       TALLOC_CTX *mem_ctx)
 172 {
 173         NTSTATUS status;
 174
 175         status = composite_wait(c);
 176
 177         if (NT_STATUS_IS_OK(status)) {
 178                 struct fetchfile_state *state = talloc_get_type(c->private_data, struct fetchfile_state);
 179                 talloc_steal(mem_ctx, state->io->out.data);
 180         }
 181
 182         talloc_free(c);
 183         return status;
 184 }
 185
 186 NTSTATUS smb_composite_fetchfile(struct smb_composite_fetchfile *io,
 187                                  TALLOC_CTX *mem_ctx)
 188 {
 189         struct composite_context *c = smb_composite_fetchfile_send(io, NULL);
 190         return smb_composite_fetchfile_recv(c, mem_ctx);
 191 }