summaryrefslogtreecommitdiff
path: root/ShellPkg/Application/Shell/ShellEnvVar.c
blob: d674f14c24c30c8050b875bc4b59d6216217ebf2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
/** @file
  function declarations for shell environment functions.

  Copyright (c) 2009 - 2011, Intel Corporation. All rights reserved.<BR>
  This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#include <Uefi.h>
#include <ShellBase.h>

#include <Guid/ShellVariableGuid.h>

#include <Library/BaseLib.h>
#include <Library/UefiRuntimeServicesTableLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/DebugLib.h>
#include <Library/BaseMemoryLib.h>

#include "ShellEnvVar.h"

/**
  Reports whether an environment variable is Volatile or Non-Volatile.

  @param EnvVarName             The name of the environment variable in question

  @retval TRUE                  This environment variable is Volatile
  @retval FALSE                 This environment variable is NON-Volatile
**/
BOOLEAN
EFIAPI
IsVolatileEnv (
  IN CONST CHAR16 *EnvVarName
  )
{
  EFI_STATUS  Status;
  UINTN       Size;
  VOID        *Buffer;
  UINT32      Attribs;

  Size = 0;
  Buffer = NULL;

  //
  // get the variable
  //
  Status = gRT->GetVariable((CHAR16*)EnvVarName,
                            &gShellVariableGuid,
                            &Attribs,
                            &Size,
                            Buffer);
  if (Status == EFI_BUFFER_TOO_SMALL) {
    Buffer = AllocateZeroPool(Size);
    ASSERT(Buffer != NULL);
    Status = gRT->GetVariable((CHAR16*)EnvVarName,
                              &gShellVariableGuid,
                              &Attribs,
                              &Size,
                              Buffer);
    FreePool(Buffer);
  }
  //
  // not found means volatile
  //
  if (Status == EFI_NOT_FOUND) {
    return (TRUE);
  }
  ASSERT_EFI_ERROR(Status);

  //
  // check for the Non Volatile bit
  //
  if ((Attribs & EFI_VARIABLE_NON_VOLATILE) == EFI_VARIABLE_NON_VOLATILE) {
    return (FALSE);
  }

  //
  // everything else is volatile
  //
  return (TRUE);
}

/**
  free function for ENV_VAR_LIST objects.

  @param[in] List               The pointer to pointer to list.
**/
VOID
EFIAPI
FreeEnvironmentVariableList(
  IN LIST_ENTRY *List
  )
{
  ENV_VAR_LIST *Node;

  ASSERT (List != NULL);
  if (List == NULL) {
    return;
  }

  for ( Node = (ENV_VAR_LIST*)GetFirstNode(List)
      ; IsListEmpty(List)
      ; Node = (ENV_VAR_LIST*)GetFirstNode(List)
     ){
    ASSERT(Node != NULL);
    RemoveEntryList(&Node->Link);
    if (Node->Key != NULL) {
      FreePool(Node->Key);
    }
    if (Node->Val != NULL) {
      FreePool(Node->Val);
    }
    FreePool(Node);
  }
}

/**
  Creates a list of all Shell-Guid-based environment variables.

  @param[in,out] ListHead       The pointer to pointer to LIST ENTRY object for
                                storing this list.

  @retval EFI_SUCCESS           the list was created sucessfully.
**/
EFI_STATUS
EFIAPI
GetEnvironmentVariableList(
  IN OUT LIST_ENTRY *ListHead
  )
{
  CHAR16            *VariableName;
  UINTN             NameSize;
  UINT64            MaxStorSize;
  UINT64            RemStorSize;
  UINT64            MaxVarSize;
  EFI_STATUS        Status;
  EFI_GUID          Guid;
  UINTN             ValSize;
  ENV_VAR_LIST      *VarList;

  if (ListHead == NULL) {
    return (EFI_INVALID_PARAMETER);
  }

  if (gRT->Hdr.Revision >= EFI_2_00_SYSTEM_TABLE_REVISION) {
    Status = gRT->QueryVariableInfo(EFI_VARIABLE_NON_VOLATILE|EFI_VARIABLE_BOOTSERVICE_ACCESS, &MaxStorSize, &RemStorSize, &MaxVarSize);
    if (EFI_ERROR(Status)) {
      return (Status);
    }
  } else {
    Status = EFI_SUCCESS;
    MaxVarSize = 16384;
  }

  NameSize = (UINTN)MaxVarSize;
  VariableName = AllocateZeroPool(NameSize);
  if (VariableName == NULL) {
    return (EFI_OUT_OF_RESOURCES);
  }
  StrCpy(VariableName, L"");

  while (!EFI_ERROR(Status)) {
    NameSize = (UINTN)MaxVarSize;
    Status = gRT->GetNextVariableName(&NameSize, VariableName, &Guid);
    if (Status == EFI_NOT_FOUND){
      Status = EFI_SUCCESS;
      break;
    }
    if (!EFI_ERROR(Status) && CompareGuid(&Guid, &gShellVariableGuid)){
      VarList = AllocateZeroPool(sizeof(ENV_VAR_LIST));
      if (VarList == NULL) {
        Status = EFI_OUT_OF_RESOURCES;
      } else {
        ValSize = 0;
        Status = SHELL_GET_ENVIRONMENT_VARIABLE_AND_ATTRIBUTES(VariableName, &VarList->Atts, &ValSize, VarList->Val);
        if (Status == EFI_BUFFER_TOO_SMALL){
          VarList->Val = AllocateZeroPool(ValSize);
          if (VarList->Val == NULL) {
            SHELL_FREE_NON_NULL(VarList);
            Status = EFI_OUT_OF_RESOURCES;
          } else {
            Status = SHELL_GET_ENVIRONMENT_VARIABLE_AND_ATTRIBUTES(VariableName, &VarList->Atts, &ValSize, VarList->Val);
          }
        }
        if (!EFI_ERROR(Status) && VarList != NULL) {
          VarList->Key = AllocateZeroPool(StrSize(VariableName));
          if (VarList->Key == NULL) {
            SHELL_FREE_NON_NULL(VarList->Val);
            SHELL_FREE_NON_NULL(VarList);
            Status = EFI_OUT_OF_RESOURCES;
          } else {
            StrCpy(VarList->Key, VariableName);
            InsertTailList(ListHead, &VarList->Link);
          }
        }
      }
    } // compare guid
  } // while
  FreePool(VariableName);

  if (EFI_ERROR(Status)) {
    FreeEnvironmentVariableList(ListHead);
  }

  return (Status);
}

/**
  Sets a list of all Shell-Guid-based environment variables.  this will
  also eliminate all existing shell environment variables (even if they
  are not on the list).

  This function will also deallocate the memory from List.

  @param[in] ListHead           The pointer to LIST_ENTRY from
                                GetShellEnvVarList().

  @retval EFI_SUCCESS           the list was Set sucessfully.
**/
EFI_STATUS
EFIAPI
SetEnvironmentVariableList(
  IN LIST_ENTRY *ListHead
  )
{
  ENV_VAR_LIST      VarList;
  ENV_VAR_LIST      *Node;
  EFI_STATUS        Status;
  UINTN             Size;

  InitializeListHead(&VarList.Link);

  //
  // Delete all the current environment variables
  //
  Status = GetEnvironmentVariableList(&VarList.Link);
  ASSERT_EFI_ERROR(Status);

  for ( Node = (ENV_VAR_LIST*)GetFirstNode(&VarList.Link)
      ; !IsNull(&VarList.Link, &Node->Link)
      ; Node = (ENV_VAR_LIST*)GetNextNode(&VarList.Link, &Node->Link)
     ){
    if (Node->Key != NULL) {
      Status = SHELL_DELETE_ENVIRONMENT_VARIABLE(Node->Key);
    }
    ASSERT_EFI_ERROR(Status);
  }

  FreeEnvironmentVariableList(&VarList.Link);

  //
  // set all the variables fron the list
  //
  for ( Node = (ENV_VAR_LIST*)GetFirstNode(ListHead)
      ; !IsNull(ListHead, &Node->Link)
      ; Node = (ENV_VAR_LIST*)GetNextNode(ListHead, &Node->Link)
     ){
    Size = StrSize(Node->Val);
    if (Node->Atts & EFI_VARIABLE_NON_VOLATILE) {
      Status = SHELL_SET_ENVIRONMENT_VARIABLE_NV(Node->Key, Size, Node->Val);
    } else {
      Status = SHELL_SET_ENVIRONMENT_VARIABLE_V (Node->Key, Size, Node->Val);
    }
    ASSERT_EFI_ERROR(Status);
  }
  FreeEnvironmentVariableList(ListHead);

  return (Status);
}

/**
  sets a list of all Shell-Guid-based environment variables.

  @param Environment        Points to a NULL-terminated array of environment
                            variables with the format 'x=y', where x is the
                            environment variable name and y is the value.

  @retval EFI_SUCCESS       The command executed successfully.
  @retval EFI_INVALID_PARAMETER The parameter is invalid.
  @retval EFI_OUT_OF_RESOURCES Out of resources.

  @sa SetEnvironmentVariableList
**/
EFI_STATUS
EFIAPI
SetEnvironmentVariables(
  IN CONST CHAR16 **Environment
  )
{
  CONST CHAR16  *CurrentString;
  UINTN         CurrentCount;
  ENV_VAR_LIST  *VarList;
  ENV_VAR_LIST  *Node;
  UINTN         NewSize;

  VarList = NULL;

  if (Environment == NULL) {
    return (EFI_INVALID_PARAMETER);
  }

  //
  // Build a list identical to the ones used for get/set list functions above
  //
  for ( CurrentCount = 0
      ;
      ; CurrentCount++
     ){
    CurrentString = Environment[CurrentCount];
    if (CurrentString == NULL) {
      break;
    }
    ASSERT(StrStr(CurrentString, L"=") != NULL);
    Node = AllocateZeroPool(sizeof(ENV_VAR_LIST));
    ASSERT(Node != NULL);
    Node->Key = AllocateZeroPool((StrStr(CurrentString, L"=") - CurrentString + 1) * sizeof(CHAR16));
    ASSERT(Node->Key != NULL);
    StrnCpy(Node->Key, CurrentString, StrStr(CurrentString, L"=") - CurrentString);
    NewSize = StrSize(CurrentString);
    NewSize -= StrLen(Node->Key) - 1;
    Node->Val = AllocateZeroPool(NewSize);
    ASSERT(Node->Val != NULL);
    StrCpy(Node->Val, CurrentString + StrLen(Node->Key) + 1);
    Node->Atts = EFI_VARIABLE_BOOTSERVICE_ACCESS;

    if (VarList == NULL) {
      VarList = AllocateZeroPool(sizeof(ENV_VAR_LIST));
      ASSERT(VarList != NULL);
      InitializeListHead(&VarList->Link);
    }
    InsertTailList(&VarList->Link, &Node->Link);

  } // for loop

  //
  // set this new list as the set of all environment variables.
  // this function also frees the memory and deletes all pre-existing
  // shell-guid based environment variables.
  //
  return (SetEnvironmentVariableList(&VarList->Link));
}