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audk/ShellPkg/Application/Shell/ShellManParser.c

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/** @file
Provides interface to shell MAN file parser.
Copyright (c) 2009 - 2019, Intel Corporation. All rights reserved.<BR>
Copyright 2015 Dell Inc.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "Shell.h"
#define SHELL_MAN_HII_GUID \
{ \
0xf62ccd0c, 0x2449, 0x453c, { 0x8a, 0xcb, 0x8c, 0xc5, 0x7c, 0xf0, 0x2a, 0x97 } \
}
EFI_HII_HANDLE mShellManHiiHandle = NULL;
EFI_HANDLE mShellManDriverHandle = NULL;
SHELL_MAN_HII_VENDOR_DEVICE_PATH mShellManHiiDevicePath = {
{
{
HARDWARE_DEVICE_PATH,
HW_VENDOR_DP,
{
(UINT8) (sizeof (VENDOR_DEVICE_PATH)),
(UINT8) ((sizeof (VENDOR_DEVICE_PATH)) >> 8)
}
},
SHELL_MAN_HII_GUID
},
{
END_DEVICE_PATH_TYPE,
END_ENTIRE_DEVICE_PATH_SUBTYPE,
{
(UINT8) (END_DEVICE_PATH_LENGTH),
(UINT8) ((END_DEVICE_PATH_LENGTH) >> 8)
}
}
};
/**
Verifies that the filename has .EFI on the end.
allocates a new buffer and copies the name (appending .EFI if necessary).
Caller to free the buffer.
@param[in] NameString original name string
@return the new filename with .efi as the extension.
**/
CHAR16 *
GetExecuatableFileName (
IN CONST CHAR16 *NameString
)
{
CHAR16 *Buffer;
CHAR16 *SuffixStr;
if (NameString == NULL) {
return (NULL);
}
//
// Fix the file name
//
if (StrnCmp(NameString+StrLen(NameString)-StrLen(L".efi"), L".efi", StrLen(L".efi"))==0) {
Buffer = AllocateCopyPool(StrSize(NameString), NameString);
} else if (StrnCmp(NameString+StrLen(NameString)-StrLen(L".man"), L".man", StrLen(L".man"))==0) {
Buffer = AllocateCopyPool(StrSize(NameString), NameString);
if (Buffer != NULL) {
SuffixStr = Buffer+StrLen(Buffer)-StrLen(L".man");
StrnCpyS (SuffixStr, StrSize(L".man")/sizeof(CHAR16), L".efi", StrLen(L".efi"));
}
} else {
Buffer = AllocateZeroPool(StrSize(NameString) + StrLen(L".efi")*sizeof(CHAR16));
if (Buffer != NULL) {
StrnCpyS( Buffer,
(StrSize(NameString) + StrLen(L".efi")*sizeof(CHAR16))/sizeof(CHAR16),
NameString,
StrLen(NameString)
);
StrnCatS( Buffer,
(StrSize(NameString) + StrLen(L".efi")*sizeof(CHAR16))/sizeof(CHAR16),
L".efi",
StrLen(L".efi")
);
}
}
return (Buffer);
}
/**
Verifies that the filename has .MAN on the end.
allocates a new buffer and copies the name (appending .MAN if necessary)
ASSERT if ManFileName is NULL
@param[in] ManFileName original filename
@return the new filename with .man as the extension.
**/
CHAR16 *
GetManFileName(
IN CONST CHAR16 *ManFileName
)
{
CHAR16 *Buffer;
if (ManFileName == NULL) {
return (NULL);
}
//
// Fix the file name
//
if (StrnCmp(ManFileName+StrLen(ManFileName)-4, L".man", 4)==0) {
Buffer = AllocateCopyPool(StrSize(ManFileName), ManFileName);
} else {
Buffer = AllocateZeroPool(StrSize(ManFileName) + 4*sizeof(CHAR16));
if (Buffer != NULL) {
StrnCpyS( Buffer,
(StrSize(ManFileName) + 4*sizeof(CHAR16))/sizeof(CHAR16),
ManFileName,
StrLen(ManFileName)
);
StrnCatS( Buffer,
(StrSize(ManFileName) + 4*sizeof(CHAR16))/sizeof(CHAR16),
L".man",
4
);
}
}
return (Buffer);
}
/**
Search the path environment variable for possible locations and test for
which one contains a man file with the name specified. If a valid file is found
stop searching and return the (opened) SHELL_FILE_HANDLE for that file.
@param[in] FileName Name of the file to find and open.
@param[out] Handle Pointer to the handle of the found file. The
value of this is undefined for return values
except EFI_SUCCESS.
@retval EFI_SUCCESS The file was found. Handle is a valid SHELL_FILE_HANDLE
@retval EFI_INVALID_PARAMETER A parameter had an invalid value.
@retval EFI_NOT_FOUND The file was not found.
**/
EFI_STATUS
SearchPathForFile(
IN CONST CHAR16 *FileName,
OUT SHELL_FILE_HANDLE *Handle
)
{
CHAR16 *FullFileName;
EFI_STATUS Status;
if ( FileName == NULL
|| Handle == NULL
|| StrLen(FileName) == 0
){
return (EFI_INVALID_PARAMETER);
}
FullFileName = ShellFindFilePath(FileName);
if (FullFileName == NULL) {
return (EFI_NOT_FOUND);
}
//
// now open that file
//
Status = EfiShellOpenFileByName(FullFileName, Handle, EFI_FILE_MODE_READ);
FreePool(FullFileName);
return (Status);
}
/**
Parses through the MAN file specified by SHELL_FILE_HANDLE and returns the
detailed help for any sub section specified in the comma separated list of
sections provided. If the end of the file or a .TH section is found then
return.
Upon a successful return the caller is responsible to free the memory in *HelpText
@param[in] Handle FileHandle to read from
@param[in] Sections name of command's sub sections to find
@param[out] HelpText pointer to pointer to string where text goes.
@param[out] HelpSize pointer to size of allocated HelpText (may be updated)
@param[in] Ascii TRUE if the file is ASCII, FALSE otherwise.
@retval EFI_OUT_OF_RESOURCES a memory allocation failed.
@retval EFI_SUCCESS the section was found and its description stored in
an allocated buffer.
**/
EFI_STATUS
ManFileFindSections(
IN SHELL_FILE_HANDLE Handle,
IN CONST CHAR16 *Sections,
OUT CHAR16 **HelpText,
OUT UINTN *HelpSize,
IN BOOLEAN Ascii
)
{
EFI_STATUS Status;
CHAR16 *ReadLine;
UINTN Size;
BOOLEAN CurrentlyReading;
CHAR16 *SectionName;
UINTN SectionLen;
BOOLEAN Found;
if ( Handle == NULL
|| HelpText == NULL
|| HelpSize == NULL
){
return (EFI_INVALID_PARAMETER);
}
Status = EFI_SUCCESS;
CurrentlyReading = FALSE;
Size = 1024;
Found = FALSE;
ReadLine = AllocateZeroPool(Size);
if (ReadLine == NULL) {
return (EFI_OUT_OF_RESOURCES);
}
for (;!ShellFileHandleEof(Handle);Size = 1024) {
Status = ShellFileHandleReadLine(Handle, ReadLine, &Size, TRUE, &Ascii);
if (ReadLine[0] == L'#') {
//
// Skip comment lines
//
continue;
}
//
// ignore too small of buffer...
//
if (Status == EFI_BUFFER_TOO_SMALL) {
Status = EFI_SUCCESS;
}
if (EFI_ERROR(Status)) {
break;
} else if (StrnCmp(ReadLine, L".TH", 3) == 0) {
//
// we hit the end of this commands section so stop.
//
break;
} else if (StrnCmp(ReadLine, L".SH", 3) == 0) {
if (Sections == NULL) {
CurrentlyReading = TRUE;
continue;
}
//
// we found a section
//
if (CurrentlyReading) {
CurrentlyReading = FALSE;
}
//
// is this a section we want to read in?
//
for ( SectionName = ReadLine + 3
; *SectionName == L' '
; SectionName++);
SectionLen = StrLen(SectionName);
SectionName = StrStr(Sections, SectionName);
if (SectionName == NULL) {
continue;
}
if (*(SectionName + SectionLen) == CHAR_NULL || *(SectionName + SectionLen) == L',') {
CurrentlyReading = TRUE;
}
} else if (CurrentlyReading) {
Found = TRUE;
//
// copy and save the current line.
//
ASSERT((*HelpText == NULL && *HelpSize == 0) || (*HelpText != NULL));
StrnCatGrow (HelpText, HelpSize, ReadLine, 0);
StrnCatGrow (HelpText, HelpSize, L"\r\n", 0);
}
}
FreePool(ReadLine);
if (!Found && !EFI_ERROR(Status)) {
return (EFI_NOT_FOUND);
}
return (Status);
}
/**
Parses a line from a MAN file to see if it is the Title Header. If it is, then
if the "Brief Description" is desired, allocate a buffer for it and return a
copy. Upon a successful return the caller is responsible to free the memory in
*BriefDesc
Uses a simple state machine that allows "unlimited" whitespace before and after the
".TH", compares Command and the MAN file command name without respect to case, and
allows "unlimited" whitespace and '0' and '1' characters before the Short Description.
The PCRE regex describing this functionality is: ^\s*\.TH\s+(\S)\s[\s01]*(.*)$
where group 1 is the Command Name and group 2 is the Short Description.
@param[in] Command name of command whose MAN file we think Line came from
@param[in] Line Pointer to a line from the MAN file
@param[out] BriefDesc pointer to pointer to string where description goes.
@param[out] BriefSize pointer to size of allocated BriefDesc
@param[out] Found TRUE if the Title Header was found and it belongs to Command
@retval TRUE Line contained the Title Header
@retval FALSE Line did not contain the Title Header
**/
BOOLEAN
IsTitleHeader(
IN CONST CHAR16 *Command,
IN CHAR16 *Line,
OUT CHAR16 **BriefDesc OPTIONAL,
OUT UINTN *BriefSize OPTIONAL,
OUT BOOLEAN *Found
)
{
// The states of a simple state machine used to recognize a title header line
// and to extract the Short Description, if desired.
typedef enum {
LookForThMacro, LookForCommandName, CompareCommands, GetBriefDescription, Final
} STATEVALUES;
STATEVALUES State;
UINTN CommandIndex; // Indexes Command as we compare its chars to the MAN file.
BOOLEAN ReturnValue; // TRUE if this the Title Header line of *some* MAN file.
BOOLEAN ReturnFound; // TRUE if this the Title Header line of *the desired* MAN file.
ReturnValue = FALSE;
ReturnFound = FALSE;
CommandIndex = 0;
State = LookForThMacro;
do {
if (*Line == L'\0') {
break;
}
switch (State) {
// Handle "^\s*.TH\s"
// Go to state LookForCommandName if the title header macro is present; otherwise,
// eat white space. If we see something other than white space, this is not a
// title header line.
case LookForThMacro:
if (StrnCmp (L".TH ", Line, 4) == 0 || StrnCmp (L".TH\t", Line, 4) == 0) {
Line += 4;
State = LookForCommandName;
}
else if (*Line == L' ' || *Line == L'\t') {
Line++;
}
else {
State = Final;
}
break;
// Handle "\s*"
// Eat any "extra" whitespace after the title header macro (we have already seen
// at least one white space character). Go to state CompareCommands when a
// non-white space is seen.
case LookForCommandName:
if (*Line == L' ' || *Line == L'\t') {
Line++;
}
else {
ReturnValue = TRUE; // This is *some* command's title header line.
State = CompareCommands;
// Do not increment Line; it points to the first character of the command
// name on the title header line.
}
break;
// Handle "(\S)\s"
// Compare Command to the title header command name, ignoring case. When we
// reach the end of the command (i.e. we see white space), the next state
// depends on whether the caller wants a copy of the Brief Description.
case CompareCommands:
if (*Line == L' ' || *Line == L'\t') {
ReturnFound = TRUE; // This is the desired command's title header line.
State = (BriefDesc == NULL) ? Final : GetBriefDescription;
}
else if (CharToUpper (*Line) != CharToUpper (*(Command + CommandIndex++))) {
State = Final;
}
Line++;
break;
// Handle "[\s01]*(.*)$"
// Skip whitespace, '0', and '1' characters, if any, prior to the brief description.
// Return the description to the caller.
case GetBriefDescription:
if (*Line != L' ' && *Line != L'\t' && *Line != L'0' && *Line != L'1') {
*BriefSize = StrSize(Line);
*BriefDesc = AllocateZeroPool(*BriefSize);
if (*BriefDesc != NULL) {
StrCpyS(*BriefDesc, (*BriefSize)/sizeof(CHAR16), Line);
}
State = Final;
}
Line++;
break;
default:
break;
}
} while (State < Final);
*Found = ReturnFound;
return ReturnValue;
}
/**
Parses through the MAN file specified by SHELL_FILE_HANDLE and returns the
"Brief Description" for the .TH section as specified by Command. If the
command section is not found return EFI_NOT_FOUND.
Upon a successful return the caller is responsible to free the memory in *BriefDesc
@param[in] Handle FileHandle to read from
@param[in] Command name of command's section to find as entered on the
command line (may be a relative or absolute path or
be in any case: upper, lower, or mixed in numerous ways!).
@param[out] BriefDesc pointer to pointer to string where description goes.
@param[out] BriefSize pointer to size of allocated BriefDesc
@param[in, out] Ascii TRUE if the file is ASCII, FALSE otherwise, will be
set if the file handle is at the 0 position.
@retval EFI_OUT_OF_RESOURCES a memory allocation failed.
@retval EFI_SUCCESS the section was found and its description stored in
an allocated buffer if requested.
**/
EFI_STATUS
ManFileFindTitleSection(
IN SHELL_FILE_HANDLE Handle,
IN CONST CHAR16 *Command,
OUT CHAR16 **BriefDesc OPTIONAL,
OUT UINTN *BriefSize OPTIONAL,
IN OUT BOOLEAN *Ascii
)
{
EFI_STATUS Status;
CHAR16 *ReadLine;
UINTN Size;
BOOLEAN Found;
UINTN Start;
if ( Handle == NULL
|| Command == NULL
|| (BriefDesc != NULL && BriefSize == NULL)
){
return (EFI_INVALID_PARAMETER);
}
Status = EFI_SUCCESS;
Size = 1024;
Found = FALSE;
ReadLine = AllocateZeroPool(Size);
if (ReadLine == NULL) {
return (EFI_OUT_OF_RESOURCES);
}
//
// Do not pass any leading path information that may be present to IsTitleHeader().
//
Start = StrLen(Command);
while ((Start != 0)
&& (*(Command + Start - 1) != L'\\')
&& (*(Command + Start - 1) != L'/')
&& (*(Command + Start - 1) != L':')) {
--Start;
}
for (;!ShellFileHandleEof(Handle);Size = 1024) {
Status = ShellFileHandleReadLine(Handle, ReadLine, &Size, TRUE, Ascii);
//
// ignore too small of buffer...
//
if (EFI_ERROR(Status) && Status != EFI_BUFFER_TOO_SMALL) {
break;
}
Status = EFI_NOT_FOUND;
if (IsTitleHeader (Command+Start, ReadLine, BriefDesc, BriefSize, &Found)) {
Status = Found ? EFI_SUCCESS : EFI_NOT_FOUND;
break;
}
}
FreePool(ReadLine);
return (Status);
}
/**
This function returns the help information for the specified command. The help text
will be parsed from a UEFI Shell manual page. (see UEFI Shell 2.0 Appendix B)
If Sections is specified, then each section name listed will be compared in a casesensitive
manner, to the section names described in Appendix B. If the section exists,
it will be appended to the returned help text. If the section does not exist, no
information will be returned. If Sections is NULL, then all help text information
available will be returned.
if BriefDesc is NULL, then the breif description will not be saved separately,
but placed first in the main HelpText.
@param[in] ManFileName Points to the NULL-terminated UEFI Shell MAN file name.
@param[in] Command Points to the NULL-terminated UEFI Shell command name.
@param[in] Sections Points to the NULL-terminated comma-delimited
section names to return. If NULL, then all
sections will be returned.
@param[out] BriefDesc On return, points to a callee-allocated buffer
containing brief description text.
@param[out] HelpText On return, points to a callee-allocated buffer
containing all specified help text.
@retval EFI_SUCCESS The help text was returned.
@retval EFI_OUT_OF_RESOURCES The necessary buffer could not be allocated to hold the
returned help text.
@retval EFI_INVALID_PARAMETER HelpText is NULL.
@retval EFI_INVALID_PARAMETER ManFileName is invalid.
@retval EFI_NOT_FOUND There is no help text available for Command.
**/
EFI_STATUS
ProcessManFile(
IN CONST CHAR16 *ManFileName,
IN CONST CHAR16 *Command,
IN CONST CHAR16 *Sections OPTIONAL,
OUT CHAR16 **BriefDesc OPTIONAL,
OUT CHAR16 **HelpText
)
{
CHAR16 *TempString;
SHELL_FILE_HANDLE FileHandle;
EFI_HANDLE CmdFileImgHandle;
EFI_STATUS Status;
UINTN HelpSize;
UINTN BriefSize;
UINTN StringIdWalker;
BOOLEAN Ascii;
CHAR16 *CmdFileName;
CHAR16 *CmdFilePathName;
EFI_DEVICE_PATH_PROTOCOL *FileDevPath;
EFI_DEVICE_PATH_PROTOCOL *DevPath;
EFI_HII_PACKAGE_LIST_HEADER *PackageListHeader;
if ( ManFileName == NULL
|| Command == NULL
|| HelpText == NULL
){
return (EFI_INVALID_PARAMETER);
}
HelpSize = 0;
BriefSize = 0;
StringIdWalker = 0;
TempString = NULL;
Ascii = FALSE;
CmdFileName = NULL;
CmdFilePathName = NULL;
CmdFileImgHandle = NULL;
PackageListHeader = NULL;
FileDevPath = NULL;
DevPath = NULL;
//
// See if it's in HII first
//
TempString = ShellCommandGetCommandHelp(Command);
if (TempString != NULL) {
FileHandle = ConvertEfiFileProtocolToShellHandle (CreateFileInterfaceMem (TRUE), NULL);
HelpSize = StrLen (TempString) * sizeof (CHAR16);
ShellWriteFile (FileHandle, &HelpSize, TempString);
ShellSetFilePosition (FileHandle, 0);
HelpSize = 0;
BriefSize = 0;
Status = ManFileFindTitleSection(FileHandle, Command, BriefDesc, &BriefSize, &Ascii);
if (!EFI_ERROR(Status) && HelpText != NULL){
Status = ManFileFindSections(FileHandle, Sections, HelpText, &HelpSize, Ascii);
}
ShellCloseFile (&FileHandle);
} else {
//
// If the image is a external app, check .MAN file first.
//
FileHandle = NULL;
TempString = GetManFileName(ManFileName);
if (TempString == NULL) {
return (EFI_INVALID_PARAMETER);
}
Status = SearchPathForFile(TempString, &FileHandle);
if (EFI_ERROR(Status)) {
FileDevPath = FileDevicePath(NULL, TempString);
DevPath = AppendDevicePath (ShellInfoObject.ImageDevPath, FileDevPath);
Status = InternalOpenFileDevicePath(DevPath, &FileHandle, EFI_FILE_MODE_READ, 0);
SHELL_FREE_NON_NULL(FileDevPath);
SHELL_FREE_NON_NULL(DevPath);
}
if (!EFI_ERROR(Status)) {
HelpSize = 0;
BriefSize = 0;
Status = ManFileFindTitleSection(FileHandle, Command, BriefDesc, &BriefSize, &Ascii);
if (!EFI_ERROR(Status) && HelpText != NULL){
Status = ManFileFindSections(FileHandle, Sections, HelpText, &HelpSize, Ascii);
}
ShellInfoObject.NewEfiShellProtocol->CloseFile(FileHandle);
if (!EFI_ERROR(Status)) {
//
// Get help text from .MAN file success.
//
goto Done;
}
}
//
// Load the app image to check EFI_HII_PACKAGE_LIST_PROTOCOL.
//
CmdFileName = GetExecuatableFileName(TempString);
if (CmdFileName == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto Done;
}
//
// If the file in CWD then use the file name, else use the full
// path name.
//
CmdFilePathName = ShellFindFilePath(CmdFileName);
if (CmdFilePathName == NULL) {
Status = EFI_NOT_FOUND;
goto Done;
}
DevPath = ShellInfoObject.NewEfiShellProtocol->GetDevicePathFromFilePath(CmdFilePathName);
Status = gBS->LoadImage(FALSE, gImageHandle, DevPath, NULL, 0, &CmdFileImgHandle);
if(EFI_ERROR(Status)) {
//
// With EFI_SECURITY_VIOLATION retval, the Image was loaded and an ImageHandle was created
// with a valid EFI_LOADED_IMAGE_PROTOCOL, but the image can not be started right now.
// If the caller doesn't have the option to defer the execution of an image, we should
// unload image for the EFI_SECURITY_VIOLATION to avoid the resource leak.
//
if (Status == EFI_SECURITY_VIOLATION) {
gBS->UnloadImage (CmdFileImgHandle);
}
*HelpText = NULL;
goto Done;
}
Status = gBS->OpenProtocol(
CmdFileImgHandle,
&gEfiHiiPackageListProtocolGuid,
(VOID**)&PackageListHeader,
gImageHandle,
NULL,
EFI_OPEN_PROTOCOL_GET_PROTOCOL
);
if(EFI_ERROR(Status)) {
*HelpText = NULL;
goto Done;
}
//
// If get package list on image handle, install it on HiiDatabase.
//
Status = gBS->InstallProtocolInterface (
&mShellManDriverHandle,
&gEfiDevicePathProtocolGuid,
EFI_NATIVE_INTERFACE,
&mShellManHiiDevicePath
);
if (EFI_ERROR(Status)) {
goto Done;
}
Status = gHiiDatabase->NewPackageList (
gHiiDatabase,
PackageListHeader,
mShellManDriverHandle,
&mShellManHiiHandle
);
if (EFI_ERROR (Status)) {
goto Done;
}
StringIdWalker = 1;
do {
SHELL_FREE_NON_NULL(TempString);
if (BriefDesc != NULL) {
SHELL_FREE_NON_NULL(*BriefDesc);
}
TempString = HiiGetString (mShellManHiiHandle, (EFI_STRING_ID)StringIdWalker, NULL);
if (TempString == NULL) {
Status = EFI_NOT_FOUND;
goto Done;
}
FileHandle = ConvertEfiFileProtocolToShellHandle (CreateFileInterfaceMem (TRUE), NULL);
HelpSize = StrLen (TempString) * sizeof (CHAR16);
ShellWriteFile (FileHandle, &HelpSize, TempString);
ShellSetFilePosition (FileHandle, 0);
HelpSize = 0;
BriefSize = 0;
Status = ManFileFindTitleSection(FileHandle, Command, BriefDesc, &BriefSize, &Ascii);
if (!EFI_ERROR(Status) && HelpText != NULL){
Status = ManFileFindSections(FileHandle, Sections, HelpText, &HelpSize, Ascii);
}
ShellCloseFile (&FileHandle);
if (!EFI_ERROR(Status)){
//
// Found what we need and return
//
goto Done;
}
StringIdWalker += 1;
} while (StringIdWalker < 0xFFFF && TempString != NULL);
}
Done:
if (mShellManDriverHandle != NULL) {
gBS->UninstallProtocolInterface (
mShellManDriverHandle,
&gEfiDevicePathProtocolGuid,
&mShellManHiiDevicePath
);
mShellManDriverHandle = NULL;
}
if (mShellManHiiHandle != NULL) {
HiiRemovePackages (mShellManHiiHandle);
mShellManHiiHandle = NULL;
}
if (CmdFileImgHandle != NULL) {
Status = gBS->UnloadImage (CmdFileImgHandle);
}
SHELL_FREE_NON_NULL(TempString);
SHELL_FREE_NON_NULL(CmdFileName);
SHELL_FREE_NON_NULL(CmdFilePathName);
SHELL_FREE_NON_NULL(FileDevPath);
SHELL_FREE_NON_NULL(DevPath);
return (Status);
}
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