audk/IntelFspPkg/Tools/PatchFv.py

912 lines
29 KiB
Python

## @ PatchFv.py
#
# Copyright (c) 2014 - 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 that 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.
#
##
import os
import re
import sys
#
# Read data from file
#
# param [in] binfile Binary file
# param [in] offset Offset
# param [in] len Length
#
# retval value Value
#
def readDataFromFile (binfile, offset, len=1):
fd = open(binfile, "r+b")
fsize = os.path.getsize(binfile)
offval = offset & 0xFFFFFFFF
if (offval & 0x80000000):
offval = fsize - (0xFFFFFFFF - offval + 1)
fd.seek(offval)
bytearray = [ord(b) for b in fd.read(len)]
value = 0
idx = len - 1
while idx >= 0:
value = value << 8 | bytearray[idx]
idx = idx - 1
fd.close()
return value
#
# Check FSP header is valid or not
#
# param [in] binfile Binary file
#
# retval boolean True: valid; False: invalid
#
def IsFspHeaderValid (binfile):
fd = open (binfile, "rb")
bindat = fd.read(0x200) # only read first 0x200 bytes
fd.close()
HeaderList = ['FSPH' , 'FSPP' , 'FSPE'] # Check 'FSPH', 'FSPP', and 'FSPE' in the FSP header
OffsetList = []
for each in HeaderList:
if each in bindat:
idx = bindat.index(each)
else:
idx = 0
OffsetList.append(idx)
if not OffsetList[0] or not OffsetList[1]: # If 'FSPH' or 'FSPP' is missing, it will return false
return False
Revision = ord(bindat[OffsetList[0] + 0x0B])
#
# if revision is bigger than 1, it means it is FSP v1.1 or greater revision, which must contain 'FSPE'.
#
if Revision > 1 and not OffsetList[2]:
return False # If FSP v1.1 or greater without 'FSPE', then return false
return True
#
# Patch data in file
#
# param [in] binfile Binary file
# param [in] offset Offset
# param [in] value Patch value
# param [in] len Length
#
# retval len Length
#
def patchDataInFile (binfile, offset, value, len=1):
fd = open(binfile, "r+b")
fsize = os.path.getsize(binfile)
offval = offset & 0xFFFFFFFF
if (offval & 0x80000000):
offval = fsize - (0xFFFFFFFF - offval + 1)
bytearray = []
idx = 0
while idx < len:
bytearray.append(value & 0xFF)
value = value >> 8
idx = idx + 1
fd.seek(offval)
fd.write("".join(chr(b) for b in bytearray))
fd.close()
return len
class Symbols:
def __init__(self):
self.dictSymbolAddress = {}
self.dictGuidNameXref = {}
self.dictFfsOffset = {}
self.dictVariable = {}
self.dictModBase = {}
self.fdFile = None
self.string = ""
self.fdBase = 0xFFFFFFFF
self.fdSize = 0
self.index = 0
self.parenthesisOpenSet = '([{<'
self.parenthesisCloseSet = ')]}>'
#
# Get FD file
#
# retval self.fdFile Retrieve FD file
#
def getFdFile (self):
return self.fdFile
#
# Get FD size
#
# retval self.fdSize Retrieve the size of FD file
#
def getFdSize (self):
return self.fdSize
#
# Create dictionaries
#
# param [in] fvDir FV's directory
# param [in] fvNames All FV's names
#
# retval 0 Created dictionaries successfully
#
def createDicts (self, fvDir, fvNames):
#
# If the fvDir is not a dirctory, then raise an exception
#
if not os.path.isdir(fvDir):
raise Exception ("'%s' is not a valid directory!" % FvDir)
#
# If the Guid.xref is not existing in fvDir, then raise an exception
#
xrefFile = os.path.join(fvDir, "Guid.xref")
if not os.path.exists(xrefFile):
raise Exception("Cannot open GUID Xref file '%s'!" % xrefFile)
#
# Add GUID reference to dictionary
#
self.dictGuidNameXref = {}
self.parseGuidXrefFile(xrefFile)
#
# Split up each FV from fvNames and get the fdBase
#
fvList = fvNames.split(":")
fdBase = fvList.pop()
if len(fvList) == 0:
fvList.append(fdBase)
#
# If the FD file is not existing, then raise an exception
#
fdFile = os.path.join(fvDir, fdBase.strip() + ".fd")
if not os.path.exists(fdFile):
raise Exception("Cannot open FD file '%s'!" % fdFile)
#
# Get the size of the FD file
#
self.fdFile = fdFile
self.fdSize = os.path.getsize(fdFile)
#
# If the INF file, which is the first element of fvList, is not existing, then raise an exception
#
infFile = os.path.join(fvDir, fvList[0].strip()) + ".inf"
if not os.path.exists(infFile):
raise Exception("Cannot open INF file '%s'!" % infFile)
#
# Parse INF file in order to get fdBase and then assign those values to dictVariable
#
self.parseInfFile(infFile)
self.dictVariable = {}
self.dictVariable["FDSIZE"] = self.fdSize
self.dictVariable["FDBASE"] = self.fdBase
#
# Collect information from FV MAP file and FV TXT file then
# put them into dictionaries
#
self.dictSymbolAddress = {}
self.dictFfsOffset = {}
for file in fvList:
#
# If the .Fv.map file is not existing, then raise an exception.
# Otherwise, parse FV MAP file
#
fvFile = os.path.join(fvDir, file.strip()) + ".Fv"
mapFile = fvFile + ".map"
if not os.path.exists(mapFile):
raise Exception("Cannot open MAP file '%s'!" % mapFile)
self.parseFvMapFile(mapFile)
#
# If the .Fv.txt file is not existing, then raise an exception.
# Otherwise, parse FV TXT file
#
fvTxtFile = fvFile + ".txt"
if not os.path.exists(fvTxtFile):
raise Exception("Cannot open FV TXT file '%s'!" % fvTxtFile)
self.parseFvTxtFile(fvTxtFile)
#
# Search all MAP files in FFS directory if it exists then parse MOD MAP file
#
ffsDir = os.path.join(fvDir, "Ffs")
if (os.path.isdir(ffsDir)):
for item in os.listdir(ffsDir):
if len(item) <= 0x24:
continue
mapFile =os.path.join(ffsDir, item, "%s.map" % item[0:0x24])
if not os.path.exists(mapFile):
continue
self.parseModMapFile(item[0x24:], mapFile)
return 0
#
# Get FV offset in FD file
#
# param [in] fvFile FV file
#
# retval offset Got FV offset successfully
#
def getFvOffsetInFd(self, fvFile):
#
# Check if the first 0x70 bytes of fvFile can be found in fdFile
#
fvHandle = open(fvFile, "r+b")
fdHandle = open(self.fdFile, "r+b")
offset = fdHandle.read().find(fvHandle.read(0x70))
fvHandle.close()
fdHandle.close()
if offset == -1:
raise Exception("Could not locate FV file %s in FD!" % fvFile)
return offset
#
# Parse INF file
#
# param [in] infFile INF file
#
# retval 0 Parsed INF file successfully
#
def parseInfFile(self, infFile):
#
# Get FV offset and search EFI_BASE_ADDRESS in the FD file
# then assign the value of EFI_BASE_ADDRESS to fdBase
#
fvOffset = self.getFvOffsetInFd(infFile[0:-4] + ".Fv")
fdIn = open(infFile, "r")
rptLine = fdIn.readline()
self.fdBase = 0xFFFFFFFF
while (rptLine != "" ):
#EFI_BASE_ADDRESS = 0xFFFDF400
match = re.match("^EFI_BASE_ADDRESS\s*=\s*(0x[a-fA-F0-9]+)", rptLine)
if match is not None:
self.fdBase = int(match.group(1), 16) - fvOffset
rptLine = fdIn.readline()
fdIn.close()
if self.fdBase == 0xFFFFFFFF:
raise Exception("Could not find EFI_BASE_ADDRESS in INF file!" % fvFile)
return 0
#
# Parse FV TXT file
#
# param [in] fvTxtFile .Fv.txt file
#
# retval 0 Parsed FV TXT file successfully
#
def parseFvTxtFile(self, fvTxtFile):
#
# Get information from .Fv.txt in order to create a dictionary
# For example,
# self.dictFfsOffset[912740BE-2284-4734-B971-84B027353F0C] = 0x000D4078
#
fvOffset = self.getFvOffsetInFd(fvTxtFile[0:-4])
fdIn = open(fvTxtFile, "r")
rptLine = fdIn.readline()
while (rptLine != "" ):
match = re.match("(0x[a-fA-F0-9]+)\s([0-9a-fA-F\-]+)", rptLine)
if match is not None:
self.dictFfsOffset[match.group(2)] = "0x%08X" % (int(match.group(1), 16) + fvOffset)
rptLine = fdIn.readline()
fdIn.close()
return 0
#
# Parse FV MAP file
#
# param [in] mapFile .Fv.map file
#
# retval 0 Parsed FV MAP file successfully
#
def parseFvMapFile(self, mapFile):
#
# Get information from .Fv.map in order to create dictionaries
# For example,
# self.dictModBase[FspSecCore:BASE] = 4294592776 (0xfffa4908)
# self.dictModBase[FspSecCore:ENTRY] = 4294606552 (0xfffa7ed8)
# self.dictModBase[FspSecCore:TEXT] = 4294593080 (0xfffa4a38)
# self.dictModBase[FspSecCore:DATA] = 4294612280 (0xfffa9538)
# self.dictSymbolAddress[FspSecCore:_SecStartup] = 0x00fffa4a38
#
fdIn = open(mapFile, "r")
rptLine = fdIn.readline()
modName = ""
while (rptLine != "" ):
if rptLine[0] != ' ':
#DxeIpl (Fixed Flash Address, BaseAddress=0x00fffb4310, EntryPoint=0x00fffb4958)
#(GUID=86D70125-BAA3-4296-A62F-602BEBBB9081 .textbaseaddress=0x00fffb4398 .databaseaddress=0x00fffb4178)
match = re.match("([_a-zA-Z0-9\-]+)\s\(.+BaseAddress=(0x[0-9a-fA-F]+),\s+EntryPoint=(0x[0-9a-fA-F]+)\)", rptLine)
if match is not None:
modName = match.group(1)
if len(modName) == 36:
modName = self.dictGuidNameXref[modName.upper()]
self.dictModBase['%s:BASE' % modName] = int (match.group(2), 16)
self.dictModBase['%s:ENTRY' % modName] = int (match.group(3), 16)
match = re.match("\(GUID=([A-Z0-9\-]+)\s+\.textbaseaddress=(0x[0-9a-fA-F]+)\s+\.databaseaddress=(0x[0-9a-fA-F]+)\)", rptLine)
if match is not None:
modName = match.group(1)
if len(modName) == 36:
modName = self.dictGuidNameXref[modName.upper()]
self.dictModBase['%s:TEXT' % modName] = int (match.group(2), 16)
self.dictModBase['%s:DATA' % modName] = int (match.group(3), 16)
else:
# 0x00fff8016c __ModuleEntryPoint
match = re.match("^\s+(0x[a-z0-9]+)\s+([_a-zA-Z0-9]+)", rptLine)
if match is not None:
self.dictSymbolAddress["%s:%s"%(modName, match.group(2))] = match.group(1)
rptLine = fdIn.readline()
fdIn.close()
return 0
#
# Parse MOD MAP file
#
# param [in] moduleName Module name
# param [in] mapFile .Fv.map file
#
# retval 0 Parsed MOD MAP file successfully
# retval 1 There is no moduleEntryPoint in modSymbols
#
def parseModMapFile(self, moduleName, mapFile):
#
# Get information from mapFile by moduleName in order to create a dictionary
# For example,
# self.dictSymbolAddress[FspSecCore:___guard_fids_count] = 0x00fffa4778
#
modSymbols = {}
fdIn = open(mapFile, "r")
reportLines = fdIn.readlines()
fdIn.close()
moduleEntryPoint = "__ModuleEntryPoint"
reportLine = reportLines[0]
if reportLine.strip().find("Archive member included") != -1:
#GCC
# 0x0000000000001d55 IoRead8
patchMapFileMatchString = "\s+(0x[0-9a-fA-F]{16})\s+([^\s][^0x][_a-zA-Z0-9\-]+)\s"
matchKeyGroupIndex = 2
matchSymbolGroupIndex = 1
prefix = '_'
else:
#MSFT
#0003:00000190 _gComBase 00007a50 SerialPo
patchMapFileMatchString = "^\s[0-9a-fA-F]{4}:[0-9a-fA-F]{8}\s+(\w+)\s+([0-9a-fA-F]{8}\s+)"
matchKeyGroupIndex = 1
matchSymbolGroupIndex = 2
prefix = ''
for reportLine in reportLines:
match = re.match(patchMapFileMatchString, reportLine)
if match is not None:
modSymbols[prefix + match.group(matchKeyGroupIndex)] = match.group(matchSymbolGroupIndex)
# Handle extra module patchable PCD variable in Linux map since it might have different format
# .data._gPcd_BinaryPatch_PcdVpdBaseAddress
# 0x0000000000003714 0x4 /tmp/ccmytayk.ltrans1.ltrans.o
handleNext = False
if matchSymbolGroupIndex == 1:
for reportLine in reportLines:
if handleNext:
handleNext = False
pcdName = match.group(1)
match = re.match("\s+(0x[0-9a-fA-F]{16})\s+", reportLine)
if match is not None:
modSymbols[prefix + pcdName] = match.group(1)
else:
match = re.match("^\s\.data\.(_gPcd_BinaryPatch[_a-zA-Z0-9\-]+)", reportLine)
if match is not None:
handleNext = True
continue
if not moduleEntryPoint in modSymbols:
return 1
modEntry = '%s:%s' % (moduleName,moduleEntryPoint)
if not modEntry in self.dictSymbolAddress:
modKey = '%s:ENTRY' % moduleName
if modKey in self.dictModBase:
baseOffset = self.dictModBase['%s:ENTRY' % moduleName] - int(modSymbols[moduleEntryPoint], 16)
else:
return 2
else:
baseOffset = int(self.dictSymbolAddress[modEntry], 16) - int(modSymbols[moduleEntryPoint], 16)
for symbol in modSymbols:
fullSym = "%s:%s" % (moduleName, symbol)
if not fullSym in self.dictSymbolAddress:
self.dictSymbolAddress[fullSym] = "0x00%08x" % (baseOffset+ int(modSymbols[symbol], 16))
return 0
#
# Parse Guid.xref file
#
# param [in] xrefFile the full directory of Guid.xref file
#
# retval 0 Parsed Guid.xref file successfully
#
def parseGuidXrefFile(self, xrefFile):
#
# Get information from Guid.xref in order to create a GuidNameXref dictionary
# The dictGuidNameXref, for example, will be like
# dictGuidNameXref [1BA0062E-C779-4582-8566-336AE8F78F09] = FspSecCore
#
fdIn = open(xrefFile, "r")
rptLine = fdIn.readline()
while (rptLine != "" ):
match = re.match("([0-9a-fA-F\-]+)\s([_a-zA-Z0-9]+)", rptLine)
if match is not None:
self.dictGuidNameXref[match.group(1).upper()] = match.group(2)
rptLine = fdIn.readline()
fdIn.close()
return 0
#
# Get current character
#
# retval elf.string[self.index]
# retval '' Exception
#
def getCurr(self):
try:
return self.string[self.index]
except Exception:
return ''
#
# Check to see if it is last index
#
# retval self.index
#
def isLast(self):
return self.index == len(self.string)
#
# Move to next index
#
def moveNext(self):
self.index += 1
#
# Skip space
#
def skipSpace(self):
while not self.isLast():
if self.getCurr() in ' \t':
self.moveNext()
else:
return
#
# Parse value
#
# retval value
#
def parseValue(self):
self.skipSpace()
var = ''
while not self.isLast():
char = self.getCurr()
if char.lower() in '_ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789:-':
var += char
self.moveNext()
else:
break
if ':' in var:
partList = var.split(':')
if len(partList) != 2:
raise Exception("Unrecognized expression %s" % var)
modName = partList[0]
modOff = partList[1]
if ('-' not in modName) and (modOff[0] in '0123456789'):
# MOD: OFFSET
var = self.getModGuid(modName) + ":" + modOff
if '-' in var: # GUID:OFFSET
value = self.getGuidOff(var)
else:
value = self.getSymbols(var)
self.synUsed = True
else:
if var[0] in '0123456789':
value = self.getNumber(var)
else:
value = self.getVariable(var)
return int(value)
#
# Parse single operation
#
# retval ~self.parseBrace() or self.parseValue()
#
def parseSingleOp(self):
self.skipSpace()
char = self.getCurr()
if char == '~':
self.moveNext()
return ~self.parseBrace()
else:
return self.parseValue()
#
# Parse symbol of Brace([, {, <)
#
# retval value or self.parseSingleOp()
#
def parseBrace(self):
self.skipSpace()
char = self.getCurr()
parenthesisType = self.parenthesisOpenSet.find(char)
if parenthesisType >= 0:
self.moveNext()
value = self.parseExpr()
self.skipSpace()
if self.getCurr() != self.parenthesisCloseSet[parenthesisType]:
raise Exception("No closing brace")
self.moveNext()
if parenthesisType == 1: # [ : Get content
value = self.getContent(value)
elif parenthesisType == 2: # { : To address
value = self.toAddress(value)
elif parenthesisType == 3: # < : To offset
value = self.toOffset(value)
return value
else:
return self.parseSingleOp()
#
# Parse symbol of Multiplier(*)
#
# retval value or self.parseSingleOp()
#
def parseMul(self):
values = [self.parseBrace()]
while True:
self.skipSpace()
char = self.getCurr()
if char == '*':
self.moveNext()
values.append(self.parseBrace())
else:
break
value = 1
for each in values:
value *= each
return value
#
# Parse symbol of And(&) and Or(|)
#
# retval value
#
def parseAndOr(self):
values = [self.parseMul()]
op = None
value = 0xFFFFFFFF
while True:
self.skipSpace()
char = self.getCurr()
if char == '&':
self.moveNext()
values.append(self.parseMul())
op = char
elif char == '|':
div_index = self.index
self.moveNext()
values.append(self.parseMul())
value = 0
op = char
else:
break
for each in values:
if op == '|':
value |= each
else:
value &= each
return value
#
# Parse symbol of Add(+) and Minus(-)
#
# retval sum(values)
#
def parseAddMinus(self):
values = [self.parseAndOr()]
while True:
self.skipSpace()
char = self.getCurr()
if char == '+':
self.moveNext()
values.append(self.parseAndOr())
elif char == '-':
self.moveNext()
values.append(-1 * self.parseAndOr())
else:
break
return sum(values)
#
# Parse expression
#
# retval self.parseAddMinus()
#
def parseExpr(self):
return self.parseAddMinus()
#
# Get result
#
# retval value
#
def getResult(self):
value = self.parseExpr()
self.skipSpace()
if not self.isLast():
raise Exception("Unexpected character found '%s'" % self.getCurr())
return value
#
# Get module GUID
#
# retval value
#
def getModGuid(self, var):
guid = (guid for guid,name in self.dictGuidNameXref.items() if name==var)
try:
value = guid.next()
except Exception:
raise Exception("Unknown module name %s !" % var)
return value
#
# Get variable
#
# retval value
#
def getVariable(self, var):
value = self.dictVariable.get(var, None)
if value == None:
raise Exception("Unrecognized variable '%s'" % var)
return value
#
# Get number
#
# retval value
#
def getNumber(self, var):
var = var.strip()
if var.startswith('0x'): # HEX
value = int(var, 16)
else:
value = int(var, 10)
return value
#
# Get content
#
# param [in] value
#
# retval value
#
def getContent(self, value):
if (value >= self.fdBase) and (value < self.fdBase + self.fdSize):
value = value - self.fdBase
if value >= self.fdSize:
raise Exception("Invalid file offset 0x%08x !" % value)
return readDataFromFile (self.fdFile, value, 4)
#
# Change value to address
#
# param [in] value
#
# retval value
#
def toAddress(self, value):
if value < self.fdSize:
value = value + self.fdBase
return value
#
# Change value to offset
#
# param [in] value
#
# retval value
#
def toOffset(self, value):
if value > self.fdBase:
value = value - self.fdBase
return value
#
# Get GUID offset
#
# param [in] value
#
# retval value
#
def getGuidOff(self, value):
# GUID:Offset
symbolName = value.split(':')
if len(symbolName) == 2 and self.dictFfsOffset.has_key(symbolName[0]):
value = (int(self.dictFfsOffset[symbolName[0]], 16) + int(symbolName[1], 16)) & 0xFFFFFFFF
else:
raise Exception("Unknown GUID %s !" % value)
return value
#
# Get symbols
#
# param [in] value
#
# retval ret
#
def getSymbols(self, value):
if self.dictSymbolAddress.has_key(value):
# Module:Function
ret = int (self.dictSymbolAddress[value], 16)
else:
raise Exception("Unknown symbol %s !" % value)
return ret
#
# Evaluate symbols
#
# param [in] expression
# param [in] isOffset
#
# retval value & 0xFFFFFFFF
#
def evaluate(self, expression, isOffset):
self.index = 0
self.synUsed = False
self.string = expression
value = self.getResult()
if isOffset:
if self.synUsed:
# Consider it as an address first
if (value >= self.fdBase) and (value < self.fdBase + self.fdSize):
value = value - self.fdBase
if value & 0x80000000:
# Consider it as a negative offset next
offset = (~value & 0xFFFFFFFF) + 1
if offset < self.fdSize:
value = self.fdSize - offset
if value >= self.fdSize:
raise Exception("Invalid offset expression !")
return value & 0xFFFFFFFF
#
# Print out the usage
#
def usage():
print "Usage: \n\tPatchFv FvBuildDir [FvFileBaseNames:]FdFileBaseNameToPatch \"Offset, Value\""
def main():
#
# Parse the options and args
#
symTables = Symbols()
#
# If the arguments are less than 4, then return an error.
#
if len(sys.argv) < 4:
Usage()
return 1
#
# If it fails to create dictionaries, then return an error.
#
if symTables.createDicts(sys.argv[1], sys.argv[2]) != 0:
print "ERROR: Failed to create symbol dictionary!!"
return 2
#
# Get FD file and size
#
fdFile = symTables.getFdFile()
fdSize = symTables.getFdSize()
try:
#
# Check to see if FSP header is valid
#
ret = IsFspHeaderValid(fdFile)
if ret == False:
raise Exception ("The FSP header is not valid. Stop patching FD.")
comment = ""
for fvFile in sys.argv[3:]:
#
# Check to see if it has enough arguments
#
items = fvFile.split(",")
if len (items) < 2:
raise Exception("Expect more arguments for '%s'!" % fvFile)
comment = ""
command = ""
params = []
for item in items:
item = item.strip()
if item.startswith("@"):
comment = item[1:]
elif item.startswith("$"):
command = item[1:]
else:
if len(params) == 0:
isOffset = True
else :
isOffset = False
#
# Parse symbols then append it to params
#
params.append (symTables.evaluate(item, isOffset))
#
# Patch a new value into FD file if it is not a command
#
if command == "":
# Patch a DWORD
if len (params) == 2:
offset = params[0]
value = params[1]
oldvalue = readDataFromFile(fdFile, offset, 4)
ret = patchDataInFile (fdFile, offset, value, 4) - 4
else:
raise Exception ("Patch command needs 2 parameters !")
if ret:
raise Exception ("Patch failed for offset 0x%08X" % offset)
else:
print "Patched offset 0x%08X:[%08X] with value 0x%08X # %s" % (offset, oldvalue, value, comment)
elif command == "COPY":
#
# Copy binary block from source to destination
#
if len (params) == 3:
src = symTables.toOffset(params[0])
dest = symTables.toOffset(params[1])
clen = symTables.toOffset(params[2])
if (dest + clen <= fdSize) and (src + clen <= fdSize):
oldvalue = readDataFromFile(fdFile, src, clen)
ret = patchDataInFile (fdFile, dest, oldvalue, clen) - clen
else:
raise Exception ("Copy command OFFSET or LENGTH parameter is invalid !")
else:
raise Exception ("Copy command needs 3 parameters !")
if ret:
raise Exception ("Copy failed from offset 0x%08X to offset 0x%08X!" % (src, dest))
else :
print "Copied %d bytes from offset 0x%08X ~ offset 0x%08X # %s" % (clen, src, dest, comment)
else:
raise Exception ("Unknown command %s!" % command)
return 0
except Exception as (ex):
print "ERROR: %s" % ex
return 1
if __name__ == '__main__':
sys.exit(main())