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ShellPkg: refine command line parsing 

Correctly divide up parameters for Argc/Argv including quote ("), escape (^), and space ( ) processing.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jaben Carsey <Jaben.carsey@intel.com>
Reviewed-by: Joe Peterson <joe.peterson@intel.com>
Reviewed-by: Tapan Shah <tapandshah@hp.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16673 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Jaben Carsey 2015-01-27 18:56:36 +00:00 committed by jcarsey
parent fdd52bde51
commit 14030c5c85
3 changed files with 217 additions and 122 deletions
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90
ShellPkg/Application/Shell/Shell.c
View File

@ -1870,12 +1870,12 @@ IsValidSplit(
return (EFI_OUT_OF_RESOURCES);
}
TempWalker = (CHAR16*)Temp;
GetNextParameter(&TempWalker, &FirstParameter, StrSize(CmdLine));
if (GetOperationType(FirstParameter) == Unknown_Invalid) {
ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_SHELL_NOT_FOUND), ShellInfoObject.HiiHandle, FirstParameter);
SetLastError(SHELL_NOT_FOUND);
Status = EFI_NOT_FOUND;
if (!EFI_ERROR(GetNextParameter(&TempWalker, &FirstParameter, StrSize(CmdLine)))) {
if (GetOperationType(FirstParameter) == Unknown_Invalid) {
ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_SHELL_NOT_FOUND), ShellInfoObject.HiiHandle, FirstParameter);
SetLastError(SHELL_NOT_FOUND);
Status = EFI_NOT_FOUND;
}
}
}
@ -2030,24 +2030,25 @@ DoHelpUpdate(
Walker = *CmdLine;
while(Walker != NULL && *Walker != CHAR_NULL) {
LastWalker = Walker;
GetNextParameter(&Walker, &CurrentParameter, StrSize(*CmdLine));
if (StrStr(CurrentParameter, L"-?") == CurrentParameter) {
LastWalker[0] = L' ';
LastWalker[1] = L' ';
NewCommandLine = AllocateZeroPool(StrSize(L"help ") + StrSize(*CmdLine));
if (NewCommandLine == NULL) {
Status = EFI_OUT_OF_RESOURCES;
if (!EFI_ERROR(GetNextParameter(&Walker, &CurrentParameter, StrSize(*CmdLine)))) {
if (StrStr(CurrentParameter, L"-?") == CurrentParameter) {
LastWalker[0] = L' ';
LastWalker[1] = L' ';
NewCommandLine = AllocateZeroPool(StrSize(L"help ") + StrSize(*CmdLine));
if (NewCommandLine == NULL) {
Status = EFI_OUT_OF_RESOURCES;
break;
}
//
// We know the space is sufficient since we just calculated it.
//
StrnCpy(NewCommandLine, L"help ", 5);
StrnCat(NewCommandLine, *CmdLine, StrLen(*CmdLine));
SHELL_FREE_NON_NULL(*CmdLine);
*CmdLine = NewCommandLine;
break;
}
//
// We know the space is sufficient since we just calculated it.
//
StrnCpy(NewCommandLine, L"help ", 5);
StrnCat(NewCommandLine, *CmdLine, StrLen(*CmdLine));
SHELL_FREE_NON_NULL(*CmdLine);
*CmdLine = NewCommandLine;
break;
}
}
@ -2499,27 +2500,30 @@ RunCommand(
return (EFI_OUT_OF_RESOURCES);
}
TempWalker = CleanOriginal;
GetNextParameter(&TempWalker, &FirstParameter, StrSize(CleanOriginal));
//
// Depending on the first parameter we change the behavior
//
switch (Type = GetOperationType(FirstParameter)) {
case File_Sys_Change:
Status = ChangeMappedDrive (FirstParameter);
break;
case Internal_Command:
case Script_File_Name:
case Efi_Application:
Status = SetupAndRunCommandOrFile(Type, CleanOriginal, FirstParameter, ShellInfoObject.NewShellParametersProtocol);
break;
default:
//
// Whatever was typed, it was invalid.
//
ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_SHELL_NOT_FOUND), ShellInfoObject.HiiHandle, FirstParameter);
SetLastError(SHELL_NOT_FOUND);
break;
if (!EFI_ERROR(GetNextParameter(&TempWalker, &FirstParameter, StrSize(CleanOriginal)))) {
//
// Depending on the first parameter we change the behavior
//
switch (Type = GetOperationType(FirstParameter)) {
case File_Sys_Change:
Status = ChangeMappedDrive (FirstParameter);
break;
case Internal_Command:
case Script_File_Name:
case Efi_Application:
Status = SetupAndRunCommandOrFile(Type, CleanOriginal, FirstParameter, ShellInfoObject.NewShellParametersProtocol);
break;
default:
//
// Whatever was typed, it was invalid.
//
ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_SHELL_NOT_FOUND), ShellInfoObject.HiiHandle, FirstParameter);
SetLastError(SHELL_NOT_FOUND);
break;
}
} else {
ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_SHELL_NOT_FOUND), ShellInfoObject.HiiHandle, FirstParameter);
SetLastError(SHELL_NOT_FOUND);
}
SHELL_FREE_NON_NULL(CleanOriginal);

245
ShellPkg/Application/Shell/ShellParametersProtocol.c
View File

@ -4,7 +4,7 @@
Copyright (C) 2014, Red Hat, Inc.
Copyright (c) 2013 Hewlett-Packard Development Company, L.P.
Copyright (c) 2009 - 2014, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2009 - 2015, 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
@ -18,7 +18,79 @@
#include "Shell.h"
/**
return the next parameter from a command line string;
Return the next location of a non-escaped character from a command line string;
@param[in] String the string to parse
@param[in] Character the character to look for
@retval the location of the character in the string or the end of the string
**/
CONST CHAR16*
EFIAPI
FindCharacter(
IN CONST CHAR16 *String,
IN CONST CHAR16 Character
)
{
CONST CHAR16 *Walker;
for (Walker = String ; *Walker != Character && *Walker != CHAR_NULL; Walker++) {
if (*Walker == L'^') {
Walker++;
}
}
return Walker;
}
/**
Return the next parameter's end from a command line string;
@param[in] String the string to parse
**/
CONST CHAR16*
EFIAPI
FindEndOfParameter(
IN CONST CHAR16 *String
)
{
CONST CHAR16 *NextSpace;
CONST CHAR16 *NextQuote;
CONST CHAR16 *First;
CONST CHAR16 *CloseQuote;
NextSpace = FindCharacter (String, L' ' );
NextQuote = FindCharacter (String, L'\"');
First = MIN (NextQuote, NextSpace);
//
// nothing, all one parameter remaining
//
if (*First == CHAR_NULL) {
return (First);
}
//
// If space before a quote (or neither found, i.e. both CHAR_NULL),
// then that's the end.
//
if (First == NextSpace) {
return (NextSpace);
}
CloseQuote = FindCharacter (First+1, L'\"');
//
// We did not find a terminator... return the end of the string
//
if (*CloseQuote == CHAR_NULL) {
return (NULL);
}
return (FindEndOfParameter (CloseQuote+1));
}
/**
Return the next parameter from a command line string;
This function moves the next parameter from Walker into TempParameter and moves
Walker up past that parameter for recursive calling. When the final parameter
@ -27,12 +99,17 @@
Temp Parameter must be large enough to hold the parameter before calling this
function.
This will also remove all remaining ^ characters after processing.
@param[in, out] Walker pointer to string of command line. Adjusted to
reminaing command line on return
@param[in, out] TempParameter pointer to string of command line item extracted.
@param[in] Length buffer size of TempParameter.
@return EFI_INALID_PARAMETER A required parameter was NULL or pointed to a NULL or empty string.
@return EFI_NOT_FOUND A closing " could not be found on the specified string
**/
VOID
EFI_STATUS
EFIAPI
GetNextParameter(
IN OUT CHAR16 **Walker,
@ -41,12 +118,15 @@ GetNextParameter(
)
{
CHAR16 *NextDelim;
CHAR16 *TempLoc;
ASSERT(Walker != NULL);
ASSERT(*Walker != NULL);
ASSERT(TempParameter != NULL);
ASSERT(*TempParameter != NULL);
if (Walker == NULL
||*Walker == NULL
||TempParameter == NULL
||*TempParameter == NULL
){
return (EFI_INVALID_PARAMETER);
}
//
// make sure we dont have any leading spaces
@ -59,81 +139,80 @@ GetNextParameter(
// make sure we still have some params now...
//
if (StrLen(*Walker) == 0) {
ASSERT((*Walker)[0] == CHAR_NULL);
*Walker = NULL;
return;
DEBUG_CODE_BEGIN();
*Walker = NULL;
DEBUG_CODE_END();
return (EFI_INVALID_PARAMETER);
}
NextDelim = (CHAR16*)FindEndOfParameter(*Walker);
if (NextDelim == NULL){
DEBUG_CODE_BEGIN();
*Walker = NULL;
DEBUG_CODE_END();
return (EFI_NOT_FOUND);
}
StrnCpy(*TempParameter, (*Walker), NextDelim - *Walker);
//
// Add a CHAR_NULL if we didnt get one via the copy
//
if (*NextDelim != CHAR_NULL) {
(*TempParameter)[NextDelim - *Walker] = CHAR_NULL;
}
*Walker = NextDelim;
//
// Now remove any quotes surrounding entire parameters
//
if ((*TempParameter)[0] == L'\"' && (*TempParameter)[StrLen (*TempParameter)-1] == L'\"') {
(*TempParameter)[StrLen (*TempParameter)-1] = CHAR_NULL;
CopyMem ((*TempParameter), (*TempParameter)+1, StrSize ((*TempParameter)+1));
}
//
// we have a quoted parameter
// could be the last parameter, but SHOULD have a trailing quote
// Remove any non-escaped quotes in the string
//
if ((*Walker)[0] == L'\"') {
NextDelim = NULL;
for (TempLoc = *Walker + 1 ; TempLoc != NULL && *TempLoc != CHAR_NULL ; TempLoc++) {
if (*TempLoc == L'^' && *(TempLoc+1) == L'\"') {
TempLoc++;
} else if (*TempLoc == L'\"') {
NextDelim = TempLoc;
break;
}
}
if (NextDelim - ((*Walker)+1) == 0) {
//
// found ""
//
*(*TempParameter) = CHAR_NULL;
*Walker = NextDelim + 1;
} else if (NextDelim != NULL) {
//
// Copy ensuring that both quotes are left in place.
//
StrnCpy(*TempParameter, (*Walker), NextDelim - *Walker + 1);
*Walker = NextDelim + 1;
} else {
//
// last one... someone forgot the training quote!
//
StrnCpy(*TempParameter, *Walker, Length/sizeof(CHAR16) - 1);
*Walker = NULL;
}
for (TempLoc = *TempParameter ; TempLoc != NULL && *TempLoc != CHAR_NULL ; TempLoc++) {
if (*TempLoc == L'^' && *(TempLoc+1) == L'\"') {
CopyMem(TempLoc, TempLoc+1, StrSize(TempLoc) - sizeof(TempLoc[0]));
}
}
} else {
for (NextDelim = StrStr(*TempParameter, L"\""); NextDelim != NULL && *NextDelim != CHAR_NULL; NextDelim = StrStr(NextDelim, L"\"")) {
//
// we have a regular parameter (no quote) OR
// we have the final parameter (no trailing space)
// Make sure I found a quote character properly.
//
NextDelim = StrStr((*Walker), L" ");
if (NextDelim != NULL) {
StrnCpy(*TempParameter, *Walker, NextDelim - (*Walker));
(*TempParameter)[NextDelim - (*Walker)] = CHAR_NULL;
*Walker = NextDelim+1;
ASSERT(*NextDelim == L'\"');
//
// Only remove quotes that do not have a preceeding ^
//
if ((NextDelim > (*TempParameter) && (*(NextDelim - 1) != L'^')) || (NextDelim == (*TempParameter))) {
CopyMem (NextDelim, NextDelim + 1, StrSize (NextDelim + 1));
} else {
//
// last one.
//
StrnCpy(*TempParameter, *Walker, Length/sizeof(CHAR16) - 1);
*Walker = NULL;
}
for (NextDelim = *TempParameter ; NextDelim != NULL && *NextDelim != CHAR_NULL ; NextDelim++) {
if (*NextDelim == L'^' && *(NextDelim+1) == L'^') {
CopyMem(NextDelim, NextDelim+1, StrSize(NextDelim) - sizeof(NextDelim[0]));
}
}
while ((*TempParameter)[StrLen(*TempParameter)-1] == L' ') {
(*TempParameter)[StrLen(*TempParameter)-1] = CHAR_NULL;
}
while ((*TempParameter)[0] == L' ') {
CopyMem(*TempParameter, (*TempParameter)+1, StrSize(*TempParameter) - sizeof((*TempParameter)[0]));
NextDelim++;
}
}
return;
//
// Remove any escape charactersin the parameter before returning it
// all escape character processing is complete at this time
//
for (NextDelim = StrStr(*TempParameter, L"^"); NextDelim != NULL && *NextDelim != CHAR_NULL; NextDelim = StrStr(NextDelim, L"^")) {
//
// Make sure I found an escape character properly.
//
ASSERT(*NextDelim == L'^');
CopyMem (NextDelim, NextDelim + 1, StrSize (NextDelim + 1));
//
// If we had 2 escapes in a row, leave one behind
//
if (*NextDelim == L'^') {
NextDelim++;
}
}
return EFI_SUCCESS;
}
/**
@ -143,6 +222,9 @@ GetNextParameter(
parameters for inclusion in EFI_SHELL_PARAMETERS_PROTOCOL. this supports space
delimited and quote surrounded parameter definition.
All special character processing (alias, environment variable, redirection,
etc... must be complete before calling this API.
@param[in] CommandLine String of command line to parse
@param[in, out] Argv pointer to array of strings; one for each parameter
@param[in, out] Argc pointer to number of strings in Argv array
@ -182,9 +264,12 @@ ParseCommandLineToArgs(
for ( Count = 0
, Walker = (CHAR16*)CommandLine
; Walker != NULL && *Walker != CHAR_NULL
; GetNextParameter(&Walker, &TempParameter, Size)
, Count++
);
; Count++
) {
if (EFI_ERROR(GetNextParameter(&Walker, &TempParameter, Size))) {
break;
}
}
//
// lets allocate the pointer array
@ -199,7 +284,11 @@ ParseCommandLineToArgs(
Walker = (CHAR16*)CommandLine;
while(Walker != NULL && *Walker != CHAR_NULL) {
SetMem16(TempParameter, Size, CHAR_NULL);
GetNextParameter(&Walker, &TempParameter, Size);
if (EFI_ERROR(GetNextParameter(&Walker, &TempParameter, Size))) {
SHELL_FREE_NON_NULL(TempParameter);
return (EFI_INVALID_PARAMETER);
}
NewParam = AllocateCopyPool(StrSize(TempParameter), TempParameter);
if (NewParam == NULL){
SHELL_FREE_NON_NULL(TempParameter);

4
ShellPkg/Application/Shell/ShellParametersProtocol.h
View File

@ -192,8 +192,10 @@ ParseCommandLineToArgs(
@param[in, out] TempParameter pointer to string of command line item extracted.
@param[in] Length Length of (*TempParameter) in bytes
@return EFI_INALID_PARAMETER A required parameter was NULL or pointed to a NULL or empty string.
@return EFI_NOT_FOUND A closing " could not be found on the specified string
**/
VOID
EFI_STATUS
EFIAPI
GetNextParameter(
IN OUT CHAR16 **Walker,