这是一个用Python编写的程序，用于分析ELF格式的文件，通过学习Python语法来熟悉各种结构。程序定义了ELF头结构，并包含了解析ELF文件中如类型、机器、版本等信息的功能。
"""
该程序用于分析elf格式的文件，仅仅是在学习Python的过程中，
用于熟悉各种Python语法
"""
__author__ = "makethyme@sina.com.cn"
__version__ = "$Revision: 0.1 $"
__date__ = "$Date : 2006/08/05 $"
__copyright__ = "Copyrigth (c) 2006"
__license__ = "Python"
import os, sys
from struct import *
global OpenFile, Endian
from optparse import OptionParser
Endian = None
#the struct Elf32_Ehdr defined in Elf.h
#ELF Header
#typedef struct {
# unsigned char e_ident[EI_NIDENT]; //16
# Elf32_Half e_type; //2
# Elf32_Half e_machine; //2
# Elf32_Word e_version; //4
# Elf32_Addr e_entry; //4
# Elf32_Off e_phoff; //4
# Elf32_Off e_shoff; //4
# Elf32_Word e_flags; //4
# Elf32_Half e_ehsize; //2
# Elf32_Half e_phentsize; //2
# ELf3_Half e_phnum; //2
# Elf32_Half e_shentsize; //2
# Elf32_Half e_shnum; //2
# Elf32_Half e_shstrndx; //2
#} Elf32_Ehdr;
EI_NIDENT = 16
SIZEOFSECTIONHEADER = 50
ELFHEADERSIZESUBIDENT = 36
ELFCLASS = { /
0 : "Invalid Class",/
1 : "ELF32",/
2 : "ELF64"
}
ENCODING = { /
0 : "Invalid data encoding",/
1 : "2's complement, little endian",/
2 :"2's complement, big endian"
}
VERSION = {/
0 : "Invalid Version",/
1 : "Current Version"
}
ET_NONE = 0
ET_REL = 1
ET_EXEC = 2
ET_DYN = 3
ET_CORE = 4
ET_LOPROC = 0xff00
ET_HIPROC = 0xffff
ELFHEADERFILETYPE = {/
ET_NONE : "No file type", /
ET_REL : "Relocatable file", /
ET_EXEC : "Executable file", /
ET_DYN : "Shared Object file", /
ET_CORE : "Core file", /
ET_LOPROC : "Processor-specific", /
ET_HIPROC : "Processor-specific"
}
EM_NONE = 0
EM_M32 = 1
EM_SPACE = 2
EM_386 = 3
EM_68K = 4
EM_88K = 5
EM_860 = 7
EM_MIPS = 8
EM_S370 = 9
EM_MIPS_RS4_BE = 10
EM_PARISC = 15
EM_VPP550 = 17
EM_SPARC32PLUS = 18
EM_960 = 19
EM_FR20 = 37
EM_RH32 = 38
EM_MCORE = 39
EM_ARM = 40
EM_OLD_ALPHA = 41
EM_SH = 42
EM_MIPS_X = 51
EM_COLDFIRE = 52
EM_68HC12 = 53
EM_MMA = 54
EM_PCP = 55
EM_NCPU = 56
EM_NDR1 = 57
EM_STARCORE = 58
EM_ME16 = 59
EM_ST100 = 60
EM_TINYJ = 61
EM_FX66 = 66
EM_ST9PLUS = 67
EM_ST7 = 68
EM_68HC16 = 69
EM_68HC11 = 70
EM_68HC08 = 71
EM_68HC05 = 72
EM_SVX = 73
EM_ST19 = 74
EM_VAX = 75
EM_PJ = 99
ELFHEADERMACHINE = {/
EM_NONE : "No Machine" ,/
EM_M32 : "AT&T WE 32100" ,/
EM_SPACE : "SPARC" ,/
EM_386 : "Intel 80386" ,/
EM_68K : "Motorola 68000" ,/
EM_860 : "Intel 80860" ,/
EM_MIPS : "MIPS R3000" ,/
EM_S370 : "Amdahl" ,/
EM_MIPS_RS4_BE : "MIPS R4000 big-endian" ,/
EM_PARISC : "HPPA" ,/
EM_VPP550 : "Fujitsu VPP500" ,/
EM_SPARC32PLUS : "Sun v8plus" ,/
EM_960 : "Intel 80960" ,/
EM_FR20 : "Fujitsu FR20" ,/
EM_RH32 : "TRW RH32" ,/
EM_MCORE : "Motorolla MCore" ,/
EM_ARM : "ARM" ,/
EM_OLD_ALPHA : "Digital Alpha" ,/
EM_SH : "Hitachi SH" ,/
EM_MIPS_X : "Stanford MIPS-X" ,/
EM_COLDFIRE : "Motorola Coldfire" ,/
EM_68HC12 : "Motorola M68HC12" ,/
EM_MMA : "Fujitsu Multimedia Accelerator" ,/
EM_PCP : "Siemens PCP" ,/
EM_NCPU : "Sony nCPU embedded RISC processor" ,/
EM_NDR1 : "Denso NDR1 microprocesspr" ,/
EM_STARCORE : "Motorola Star*Core processor" ,/
EM_ME16 : "Toyota ME16 processor" ,/
EM_ST100 : "STMicroelectronics ST100 processor" ,/
EM_TINYJ : "Advanced Logic Corp. TinyJ embedded processor" ,/
EM_FX66 : "Siemens FX66 microcontroller" ,/
EM_ST9PLUS : "STMicroelectronics ST9+ 8/16 bit microcontroller",/
EM_ST7 : "STMicroelectronics ST7 8-bit microcontroller" ,/
EM_68HC16 : "Motorola MC68HC16 Microcontroller" ,/
EM_68HC11 : "Motorola MC68HC11 Microcontroller" ,/
EM_68HC08 : "Motorola MC68HC08 Microcontroller" ,/
EM_68HC05 : "Motorola MC68HC05 Microcontroller" ,/
EM_SVX : "Silicon Graphics SVx" ,/
EM_ST19 : "STMicroelectronics ST19 8-bit microcontroller" ,/
EM_VAX : "Digital VAX" ,/
EM_PJ : "picoJava"
}
SIZEOFSECTIONENTRY = 40
# Section Header
# typedef struct {
# Elf32_Word sh_name;
# Elf32_Word sh_type;
# Elf32_Word sh_flags;
# Elf32_Addr sh_addr;
# Elf32_Off sh_offset;
# Elf32_Word sh_size;
# Elf32_Word sh_link;
# Elf32_Word sh_info;
# Elf32_Word sh_addralign;
# Elf32_Word sh_entsize;
# }Elf32_Shdr;
SHT_NULL = 0
SHT_PROGBITS = 1
SHT_SYMTAB = 2
SHT_STRTAB = 3
SHT_RELA = 4
SHT_HASH = 5
SHT_DYNAMIC = 6
SHT_NOTE = 7
SHT_NOBITS = 8
SHT_REL = 9
SHT_SHLIB = 10
SHT_DYNSYM = 11
SHT_LOPROC = 0x70000000
SHT_HIPROC = 0x7fffffff
SHT_LOUSER = 0x80000000
SHT_HIUSER = 0xffffffff
SHT_VERSYM = 0x6fffffff
SHT_VERNEED = 0x6ffffffe
SECTIONTYPE = {/
SHT_NULL : "NULL",/
SHT_PROGBITS : "PROGBITS",/
SHT_SYMTAB : "SYMTAB",/
SHT_STRTAB : "STRTAB",/
SHT_RELA : "RELA",/
SHT_HASH : "HASH",/
SHT_DYNAMIC : "DYNAMIC",/
SHT_NOTE : "NOTE",/
SHT_NOBITS : "NOBITS",/
SHT_REL : "REL",/
SHT_SHLIB : "SHLIB",/
SHT_DYNSYM : "DYNSYM",/
SHT_LOPROC : "LOPROC",/
SHT_HIPROC : "HIPROC",/
SHT_LOUSER : "LOUSER",/
SHT_HIUSER : "HIUSER",/
SHT_VERSYM : "VERSYM",/
SHT_VERNEED : "VERNEED"
}
SECTIONFLAG = {/
0 : "",/
1 : "W ",/
2 : " A",/
3 : "WA",/
4 : " X",/
5 : "WX",/
6 : "AX"
}
SYMBOLHEADERENTRY = 16
# typedef struct {
# Elf32_Word st_name;
# Elf32_Addr st_value;
# Elf32_Word st_size;
# unsigned char st_info;
# unsigned char st_other;
# Elf32_Half st_shndx;
# } Elf32_Sym;
STT_NOTYPE = 0
STT_OBJECT = 1
STT_FUNC = 2
STT_SECTION = 3
STT_FILE = 4
STT_LOPROC = 13
STT_HIPROC = 15
SYMBOLTYPE = {/
STT_NOTYPE : "NOTYPE",/
STT_OBJECT : "OBJECT",/
STT_FUNC : "FUNC",/
STT_SECTION : "SECTION",/
STT_FILE : "FILE",/
STT_LOPROC : "LOPROC",/
STT_HIPROC : "HIPROC"
}
STB_LOCAL = 0
STB_GLOBAL = 1
STB_WEAK = 2
STB_LOPROC = 3
STB_HIPROC = 4
SYMBOLBIND = {/
STB_LOCAL : "LOCAL",/
STB_GLOBAL : "GLOBAL",/
STB_WEAK : "WEAK",/
STB_LOPROC : "LOPROC",/
STB_HIPROC : "HIPROC"
}
#typedef struct {
# Elf32_Word p_type;
# Elf32_Off p_offset;
# Elf32_Word p_vaddr;
# Elf32_Word p_paddr;
# Elf32_Word p_filesz;
# Elf32_Word p_memsz;
# Elf32_Word p_flags;
# Elf32_Word p_align;
# } Elf32_Phdr;
PROGRAMHEADERENTRYSIZE = 32
PT_NULL = 0
PT_LOAD = 1
PT_DYNAMIC = 2
PT_INTERP = 3
PT_NOTE = 4
PT_SHLIB = 5
PT_PHDR = 6
PT_LOPROC = 0x70000000
PT_HIPROC = 0x7fffffff
PROGRAMHEADERTYPE = {
PT_NULL : "NULL",/
PT_LOAD : "LOAD",/
PT_DYNAMIC : "DYNAMIC",/
PT_INTERP : "INTERP",/
PT_NOTE : "NOTE",/
PT_SHLIB : "SHLIB",/
PT_PHDR : "PHDR",/
PT_LOPROC : "LOPROC",/
PT_HIPROC : "HIPROC"
}
PROGRAMHEADERFLAG = {/
0 : "",/
1 : " E",/
2 : " W ",/
3 : " WE",/
4 : "R ",/
5 : "R E",/
6 : "RW ",/
7 : "RWE"
}
# typedef struct {
# Elf32_SWord d_tag;
# union {
# Elf32_Sword d_val;
# Elf32_Addr d_ptr;
# }d_un;
# }Elf32_Dyn;
DYNAMICENTRYSIZE = 8
DynamicTagDict = { /
0 : "NULL" , /
1 : "NEEDED" , /
2 : "PLTRELSZ" , /
3 : "PLTGOT" , /
4 : "HASH" , /
5 : "STRTAB" , /
6 : "SYMTAB" , /
7 : "RELA" , /
8 : "RELASZ" , /
9 : "RELAENT" , /
10 : "STRSZ" , /
11 : "SYMENT" , /
12 : "INIT" , /
13 : "FINI" , /
14 : "SONAME" , /
15 : "RPATH" , /
16 : "SYMBOLIC" , /
17 : "REL" , /
18 : "RELSZ" , /
19 : "RELENT" , /
20 : "PLTREL" , /
21 : "DEBUG" , /
22 : "TEXTREL" , /
23 : "JMPREL" , /
0x70000000 : "LOPROC" , /
0x7fffffff : "HIPROC" , /
0x6ffffffe : "VERNEED" , /
0x6fffffff : "VERNEEDNUM", /
0x6ffffff0 : "VERSYM", /
}
#typedef struct {
# Elf32_Addr r_offset;
# Elf32_Word r_info;
# } Elf32_Rel;
RelocateTypeDict = { /
0 : "R_386_NONE" ,/
1 : "R_386_32" ,/
2 : "R_386_PC32" ,/
3 : "R_386_GOT32" ,/
4 : "R_386_PLT32" ,/
5 : "R_386_COPY" ,/
6 : "R_386_GLOB_DAT" ,/
7 : "R_386_JMP_SLOT" ,/
8 : "R_386_RELATIVE" ,/
9 : "R_386_GOTOFF" ,/
10 : "R_386_GOTPC", /
}
RELOCATIONENTRYSIZE = 8
class ElfStruct:
def __init__(self, PathFile):
self.openfile = open(PathFile, "rb")
self.ElfHeader = ElfHeader(self.openfile)
self.Endian = ord(self.ElfHeader.e_ident[5])
self.strTable = ReadStrTable(self.ElfHeader, self.openfile)
self.SectionTable = SectionHeader(self.openfile, self.ElfHeader)
self.strtabIndex = FindSectionTable(self.strTable, self.SectionTable.SectionHeaderTable, '.strtab', self.ElfHeader.e_shnum)
self.symtabIndex = FindSectionTable(self.strTable, self.SectionTable.SectionHeaderTable, '.symtab', self.ElfHeader.e_shnum)
self.dynsymIndex = FindSectionTable(self.strTable, self.SectionTable.SectionHeaderTable, '.dynsym', self.ElfHeader.e_shnum)
self.dynstrIndex = FindSectionTable(self.strTable, self.SectionTable.SectionHeaderTable, '.dynstr', self.ElfHeader.e_shnum)
strtabPosition = self.SectionTable.SectionHeaderTable[self.strtabIndex][4]
strtabLength = self.SectionTable.SectionHeaderTable[self.strtabIndex][5]
self.openfile.seek(strtabPosition, 0)
self.strtabTable = self.openfile.read(strtabLength)
dynstrPosition = self.SectionTable.SectionHeaderTable[self.dynstrIndex][4]
dynstrLength = self.SectionTable.SectionHeaderTable[self.dynstrIndex][5]
self.openfile.seek(dynstrPosition, 0)
self.dynstrTable = self.openfile.read(dynstrLength)
self.DynSymbolTable = SymbolHeader(self.openfile, self.SectionTable.SectionHeaderTable, self.strtabTable, self.dynsymIndex, self.Endian)
self.SymbolTable = SymbolHeader(self.openfile, self.SectionTable.SectionHeaderTable, self.strtabTable, self.symtabIndex, self.Endian)
self.ProgramHeader = ProgramHeader(self.openfile, self.ElfHeader)
self.DynamicStruct = DynamicStruct(self.openfile, self.SectionTable, self.Endian)
self.RelocateSection = RelocateStruct(self.openfile, self.SectionTable, self.Endian)
def ParseHeader(self):
print "/n"
print "ELF Header"
Magic = self.ElfHeader.e_ident[0:4]
print "Magic:".ljust(40)+ "%02x %02x %02x %02x" % (ord(Magic[0]), ord(Magic[1]), ord(Magic[2]), ord(Magic[3] ))
ElfClass = self.ElfHeader.e_ident[4]
print "Class:".ljust(40) + "%s" % ELFCLASS[ord(ElfClass)]
Encoding = self.ElfHeader.e_ident[5]
print "Data:".ljust(40) + "%s" % ENCODING[ord(Encoding)]
Version = self.ElfHeader.e_ident[6]
print "Version:".ljust(40) + "%s" % VERSION[ord(Version)]
Padding = self.ElfHeader.e_ident[7:16]
print "Padding:".ljust(40) + "%02x %02x %02x %02x %02x %02x %02x %02x %02x" % /
(ord(Padding[0]), ord(Padding[1]), ord(Padding[2]), ord(Padding[3]), /
ord(Padding[4]), ord(Padding[5]), ord(Padding[6]), ord(Padding[7]), ord(Padding[8]) )
e_type = self.ElfHeader.e_type
print "Type:".ljust(40) + ELFHEADERFILETYPE[e_type]
e_machine = self.ElfHeader.e_machine
print "Machine:".ljust(40) + ELFHEADERMACHINE[e_machine]
e_version = self.ElfHeader.e_version
print "Version:".ljust(40) + VERSION[e_version]
print "Entry Point Address:".ljust(40) + "%04X" % self.ElfHeader.e_entry
print "Start of program header:".ljust(40) + "%d" % (self.ElfHeader.e_phoff) + " <byte into file>"
print "Start of section header".ljust(40) + "%d" % (self.ElfHeader.e_shoff) + " <byte into file>"
print "Flags:".ljust(40) + "%d" % self.ElfHeader.e_flag
print "size of this header:".ljust(40) + "%d" % self.ElfHeader.e_ehsize + " <byte into file>"
print "Size of program headers:".ljust(40) + "%d" % self.ElfHeader.e_phentsize + " <byte into file>"
print "Number of program headers:".ljust(40) + "%d" % self.ElfHeader.e_phnum
print "size of section headers:".ljust(40) + "%d" % self.ElfHeader.e_shentsize + " <byte into file>"
print "Number of section header numbers:".ljust(40) + "%d" % self.ElfHeader.e_shnum
print "Section header string table index:".ljust(40) + "%d" % self.ElfHeader.e_shstrndex
def ParseSectionHeader(self):
print "/n"
print "There are %d section header, starting at offset %0X" %(self.ElfHeader.e_shnum, self.ElfHeader.e_shoff)
print "%s".ljust(4) % "[Nr]" + " " + "%s".ljust(15) % "Name" + " " + "%-10s" % "Type" + /
" " + "%-8s" % "Addr" + " " + "%-6s" % "Off" + " " + "%-6s" % "SIZE" + /
" " + "%-2s" % "ES" + " " + "%-3s" % "Flg" + " " + "%-2s" % "Lk" + " " + "%-3s" % "Inf" + " " + "%-4s" % "Alig"
for index in range(self.ElfHeader.e_shnum):
SectionName = self.strTable[self.SectionTable.SectionHeaderTable[index][0]:].split('/0')[0]
SectionType = SECTIONTYPE[self.SectionTable.SectionHeaderTable[index][1]]
SectionAddr = self.SectionTable.SectionHeaderTable[index][3]
SectionOffset = self.SectionTable.SectionHeaderTable[index][4]
SectionSize = self.SectionTable.SectionHeaderTable[index][5]
SectionES = self.SectionTable.SectionHeaderTable[index][9]
SectionFlag = SECTIONFLAG[self.SectionTable.SectionHeaderTable[index][2]]
SectionLink = self.SectionTable.SectionHeaderTable[index][6]
SectionInfo = self.SectionTable.SectionHeaderTable[index][7]
SectionAlign = self.SectionTable.SectionHeaderTable[index][8]
print "[%02d]" % index + " " + "%-18s" % SectionName + " " /
+ "%-10s" % SectionType /
+ " " + "%08x" % SectionAddr + " " + "%06x" % SectionOffset + " " + "%06x" % SectionSize /
+ " " + "%02x" % SectionES + " " + "%03s" % SectionFlag + " " + "%02x" % SectionLink /
+ " " + "%03x" % SectionInfo + " " + "%02x" % SectionAlign
print "Key to Flags:"
print "W (write), A (alloc), X (execute), M (merge), S (strings)"
print "I (info), L (link order), G (group), x (unknown)"
print "O (extra OS processing required) o (OS specific), p (processor specific)"
def ParseSymbolHeader(self):
print
print "Symbol table /'.symtab/' contains %d entries:" % self.SymbolTable.entryNumber
print "%-4s" % "Num" + " " + "%-8s" + "Value" + " " + "%-4s" % "Size" + "%-8s" % "Type" + /
" " + "%-8s" % "Bind" + " " + "%-8s" % "Vis" + " " + "%-5s" % "Ndx" + " " + "%s" % "Name"
for index in range(self.SymbolTable.entryNumber):
SymbolInformation = self.SymbolTable.SymbolHeaderTable[index][3]
SymbolName = self.strtabTable[self.SymbolTable.SymbolHeaderTable[index][0]:].split('/0')[0]
SymbolValue = self.SymbolTable.SymbolHeaderTable[index][1]
SymbolSize = self.SymbolTable.SymbolHeaderTable[index][2]
SymbolOther = self.SymbolTable.SymbolHeaderTable[index][4]
SymbolNdx = self.SymbolTable.SymbolHeaderTable[index][5]
SymbolTypeTemp = SymbolInformation & 0x0f
SymbolBindTemp = SymbolInformation >> 4
SymbolType = SYMBOLTYPE[SymbolTypeTemp]
SymbolBind = SYMBOLBIND[SymbolBindTemp]
print "%4d" % index + " " + "%08x" % SymbolValue + " " + "%04x" % SymbolSize + " " + "%-8s" % SymbolType /
+ " " + "%-8s" % SymbolBind + " " + "%-8s" % "DEFAULT" + " " + "%05d" % SymbolNdx + " " + "%s" % SymbolName
def ParseDynSymbolHeader(self):
print
print "Symbol table /'.symtab/' contains %d entries:" % self.DynSymbolTable.entryNumber
print "%-4s" % "Num" + " " + "%-8s" % "Value" + " " + "%-4s" % "Size" + "%-8s" % "Type" + /
" " + "%-8s" % "Bind" + " " + "%-8s" % "Vis" + " " + "%-5s" % "Ndx" + " " + "%s" % "Name"
for index in range(self.DynSymbolTable.entryNumber):
SymbolInformation = self.DynSymbolTable.SymbolHeaderTable[index][3]
SymbolName = self.dynstrTable[self.DynSymbolTable.SymbolHeaderTable[index][0]:].split('/0')[0]
SymbolValue = self.DynSymbolTable.SymbolHeaderTable[index][1]
SymbolSize = self.DynSymbolTable.SymbolHeaderTable[index][2]
SymbolOther = self.DynSymbolTable.SymbolHeaderTable[index][4]
SymbolNdx = self.DynSymbolTable.SymbolHeaderTable[index][5]
SymbolTypeTemp = SymbolInformation & 0x0f
SymbolBindTemp = SymbolInformation >> 4
SymbolType = SYMBOLTYPE[SymbolTypeTemp]
SymbolBind = SYMBOLBIND[SymbolBindTemp]
#something wrong with visible, now just set it to Default
print "%4d" % index + " " + "%08x" % SymbolValue + " " + "%04x" % SymbolSize + " " + "%-8s" % SymbolType /
+ " " + "%-8s" % SymbolBind + " " + "%-8s" % "DEFAULT" + " " + "%05d" % SymbolNdx + " " + "%s" % SymbolName
def ParseProgramHeader(self):
filetypeString = "self.ElfHeader.e_type"
filetypeString = ELFHEADERFILETYPE[self.ElfHeader.e_type]
print 'Elf file type is ' + filetypeString
print " " + "%8s" % "Type" + " " + "%08s" % "Offset" + " " + "%08s" % "VirtAddr" + /
" " + "%08s" % "PhysAddr" + " " + "%08s" % "FileSize" + " " + "%08s" % "MemSize" + /
" " + "%3s" % "Flag" + "%08s" % "Align"
number = self.ProgramHeader.number
for index in range(number):
ProgramHeaderTypeTemp, ProgramHeaderOff, ProgramHeaderVadd, ProgramHeaderPaddr, /
ProgramHeaderFileSz, ProgramHeaderMemSz, ProgramHeaderFlagTemp, /
ProgramHeaderAlign = self.ProgramHeader.ProgramHeaderTable[index]
if ProgramHeaderTypeTemp == 1685382481:
ProgramHeaderType = ""
else:
ProgramHeaderType = PROGRAMHEADERTYPE[ProgramHeaderTypeTemp]
ProgramHeaderFlag = PROGRAMHEADERFLAG[ProgramHeaderFlagTemp]
print "%02d" % index + " " + "%8s" % ProgramHeaderType + " " + "%08x" % ProgramHeaderOff + " " + "%08x" % ProgramHeaderVadd + /
" " + "%08x" % ProgramHeaderPaddr + " " + "%08x" % ProgramHeaderFileSz + " " + "%08x" % ProgramHeaderMemSz + /
" " + "%3s" % ProgramHeaderFlag + " " + "%02x" % ProgramHeaderAlign
def ParseDynamicStruct(self):
print "Dynamic segment at offset %08X contains %d entries" % (self.DynamicStruct.position, self.DynamicStruct.number)
print "%-8s" % "Tag" + " " + "%12s" % "Type" + " " + "Name/Value"
for index in range(self.DynamicStruct.number):
tag, valorptr = self.DynamicStruct.DynamicStructTable[index]
tagString = DynamicTagDict[tag]
if tag == 1:
tagName = self.dynstrTable[valorptr:].split('/0')[0]
print "%08X" % tag + " " + "%12s" % tagString + " " + "Shared Library : " +"%s" % tagName
else:
print "%08X" % tag + " " + "%12s" % tagString + " " + "%08x" % valorptr
def ParseRelocateStruct(self):
relsectionnum = len(self.RelocateSection.index)
indexTable = self.RelocateSection.index
for outerIndex in range(relsectionnum):
SectionName = self.strTable[self.SectionTable.SectionHeaderTable[indexTable[outerIndex]][0]:].split('/0')[0]
Offset = self.RelocateSection.position[outerIndex]
Number = self.RelocateSection.number[outerIndex]
print
print "Relocation section /'%s/'" % SectionName + "at offset " + "%08x" % Offset + " contains " + "%d" % Number + " entries:"
print "Offset" + " " + "Info" + " " + "Type" + " " + "Sym.Value" + " " + "Sym.Name"
for index in range(Number):
OffsetField, InfoField = self.RelocateSection.RelocateStructTable[outerIndex][index]
TypeField = InfoField & 0xF
NameField = InfoField >> 8
NameString = self.dynstrTable[self.DynSymbolTable.SymbolHeaderTable[NameField][0]:].split('/0')[0]
TypeString = RelocateTypeDict[TypeField]
ValueField = 0x0
print "%08X" % OffsetField + " " + "%08X" % InfoField + " " + "%s" % TypeString + " " + "%08X" % ValueField + " " + "%s" % NameString
class ElfHeader:
def __init__(self, openfile):
self.openfile = openfile
position = 0x0L
self.openfile.seek(position, 0)
self.e_ident = self.openfile.read(16)
if self.e_ident[0:4] != "/x7FELF":
print "/nError: Not an ELF file - it has the wrong magic bytes at the start"
sys.exit(0)
self.Endian = ord(self.e_ident[5])
BigOrLittleEndian = self.Endian
RawString = self.openfile.read(ELFHEADERSIZESUBIDENT)
if BigOrLittleEndian == 2:
value = unpack(">HHiiiiiHHHHHH", RawString)
elif BigOrLittleEndian == 1:
value = unpack("<HHiiiiiHHHHHH", RawString)
self.e_type, self.e_machine, self.e_version, self.e_entry, /
self.e_phoff, self.e_shoff, self.e_flag, self.e_ehsize, /
self.e_phentsize, self.e_phnum, self.e_shentsize, self.e_shnum,/
self.e_shstrndex = value
class SectionHeader:
def __init__(self, openfile, ElfHeader):
self.openfile = openfile
self.e_shnum = ElfHeader.e_shnum
self.e_shoff = ElfHeader.e_shoff
BigOrLittleEndian = ElfHeader.Endian
self.openfile.seek(self.e_shoff, 0)
self.SectionHeaderTable = [[]]
for index in range(self.e_shnum):
RawString = self.openfile.read(SIZEOFSECTIONENTRY)
if BigOrLittleEndian == 2:
value = unpack(">iiiiiiiiii", RawString)
elif BigOrLittleEndian == 1:
value = unpack("<iiiiiiiiii", RawString)
if index != 0:
self.SectionHeaderTable.append([])
self.SectionHeaderTable[index] = value
class SymbolHeader:
def __init__(self, openfile, SectionTable, strtabTable, symtabIndex, BigOrLittleEndian):
symtablePosition = SectionTable[symtabIndex][4]
symtableLength = SectionTable[symtabIndex][5]
entrySize = SectionTable[symtabIndex][9]
if symtableLength == 0 or entrySize == 0:
entryNumber = 0
else:
entryNumber = symtableLength / entrySize
self.openfile = openfile
self.openfile.seek(symtablePosition, 0)
self.entryNumber = entryNumber
self.SymbolHeaderTable = [[]]
for index in range(entryNumber):
if index != 0:
self.SymbolHeaderTable.append([])
RawString = self.openfile.read(SYMBOLHEADERENTRY)
if BigOrLittleEndian == 2:
value = unpack(">iiiBBH", RawString)
elif BigOrLittleEndian == 1:
value = unpack("<iiiBBH", RawString)
for index_1 in range(6):
self.SymbolHeaderTable[index].append(value[index_1])
class ProgramHeader:
def __init__(self, openfile, ElfHeader):
self.openfile = openfile
self.number = ElfHeader.e_phnum
self.position = ElfHeader.e_phoff
BigOrLittleEndian = ElfHeader.Endian
self.openfile.seek(self.position, 0)
self.ProgramHeaderTable = [[]]
for index in range(self.number):
if index != 0:
self.ProgramHeaderTable.append([])
RawString = self.openfile.read(PROGRAMHEADERENTRYSIZE)
if BigOrLittleEndian == 2:
value = unpack(">iiiiiiii", RawString)
elif BigOrLittleEndian == 1:
value = unpack("<iiiiiiii", RawString)
self.ProgramHeaderTable[index] = value
class DynamicStruct:
def __init__(self, openfile, SectionTable, Endian):
BigOrLittleEndian = Endian
self.openfile = openfile
SectionHeaderTable = SectionTable.SectionHeaderTable
shnum = SectionTable.e_shnum
sectionIndex = FindSectionIndexByType(SectionHeaderTable, SHT_DYNAMIC ,shnum)
Position = SectionTable.SectionHeaderTable[sectionIndex][4]
self.position = Position
Size = SectionTable.SectionHeaderTable[sectionIndex][5]
entrySize = SectionTable.SectionHeaderTable[sectionIndex][9]
if Size == 0 or entrySize == 0:
number = 0
else:
number = Size / entrySize
self.number = number
self.openfile.seek(Position, 0)
self.DynamicStructTable = [[]]
for index in range(self.number):
if index != 0:
self.DynamicStructTable.append([])
RawString = self.openfile.read(DYNAMICENTRYSIZE)
if BigOrLittleEndian == 2:
value = unpack(">ii", RawString)
elif BigOrLittleEndian == 1:
value = unpack("<ii", RawString)
for index_1 in range(2):
self.DynamicStructTable[index].append(value[index_1])
class RelocateStruct:
def __init__(self, openfile, SectionTable, Endian):
BigOrLittleEndian = Endian
self.openfile = openfile
SectionHeaderTable = SectionTable.SectionHeaderTable
shnum = SectionTable.e_shnum
sectionIndex = FindRelocationSectionIndexByType(SectionHeaderTable, SHT_REL, shnum)
self.RelocateStructTable = [ [ [] ] ]
self.number = []
self.position = []
self.index = []
for outerIndex in range(len(sectionIndex)):
realIndex = sectionIndex[outerIndex]
if outerIndex != 0:
self.RelocateStructTable.append([ [] ])
position = SectionTable.SectionHeaderTable[realIndex][4]
self.position.append(position)
self.index.append(realIndex)
Size = SectionTable.SectionHeaderTable[realIndex][5]
entrySize = SectionTable.SectionHeaderTable[realIndex][9]
number = Size / entrySize
self.number.append(number)
self.openfile.seek(position, 0)
for index in range(number):
if index != 0:
self.RelocateStructTable[outerIndex].append([])
RawString = self.openfile.read(RELOCATIONENTRYSIZE)
if BigOrLittleEndian == 2:
value = unpack(">ii", RawString)
elif BigOrLittleEndian == 1:
value = unpack("<ii", RawString)
for index_1 in range(2):
self.RelocateStructTable[outerIndex][index].append(value[index_1])
def ReadHalfWord(SourceFile, BigOrLittleEndian):
RawString = SourceFile.read(2)
if BigOrLittleEndian == 2:
value = unpack(">h", RawString)
elif BigOrLittleEndian == 1:
value = unpack("<h", RawString)
return value[0]
def ReadOneWord(SourceFile, BigOrLittleEndian):
RawString = SourceFile.read(4)
if BigOrLittleEndian == 2:
value = unpack(">i", RawString)
elif BigOrLittleEndian == 1:
value = unpack("<i", RawString)
return value[0]
def FindSectionTable(strTable, SectionHeaderTable, findstring, e_shnum):
value = -1
for index in range(e_shnum):
SectionName = strTable[SectionHeaderTable[index][0]:].split('/0')[0]
if SectionName == findstring:
value = index;
return value
def FindSectionIndexByType(SectionHeaderTable, Type, e_shnum):
value = -1
for index in range(e_shnum):
if SectionHeaderTable[index][1] == Type:
value = index
return value
def FindRelocationSectionIndexByType(SectionHeaderTable, Type, e_shnmu):
returnIndex = []
for index in range(e_shnmu):
if SectionHeaderTable[index][1] == Type:
returnIndex.append(index)
return returnIndex
def ReadStrTable(ElfHeader, openfile):
Endian = ord(ElfHeader.e_ident[5])
strPositionTemp = ElfHeader.e_shoff + ElfHeader.e_shstrndex * SIZEOFSECTIONENTRY + 4 * 4
openfile.seek(strPositionTemp, 0)
strPosition = ReadOneWord(openfile, Endian)
strLength = ReadOneWord(openfile, Endian)
openfile.seek(strPosition, 0)
RawString = openfile.read(strLength)
return RawString
if __name__ == '__main__':
parser = OptionParser()
MSG_USAGE = """
Usage: readelf <option(s)> elf-file
Display information about the contents of ELF format files
Options are:
"""
parser.add_option("-a", "--all", dest = "bAll", default = False, action = "store_true", help = "Equivalent to: -h -l -S -s -r -d -V -A -I")
parser.add_option("-H", "--file-header", dest = "bFileHeader", default = False, action = "store_true", help = "Display the ELF file header")
parser.add_option("-l", "--program-headers", dest = "bProgramHeader", default = False, action = "store_true", help = "Display the program headers")
parser.add_option("-S", "--section-headers", dest = "bsection_headers", default= False, action = "store_true", help = "Display the sections' header")
parser.add_option("-e", "--headers", dest = "bheader", default= False, action = "store_true", help = "Equivalent to: -h -l -S")
parser.add_option("-s", "--symbols", dest = "bSymbols", default= False, action = "store_true", help = "Display the symbol table")
parser.add_option("-n", "--notes", dest = "bNotes", default= False, action = "store_true", help = "Display the core notes (if present)")
parser.add_option("-r", "--relocs", dest = "bRelocs", default= False, action = "store_true", help = "Display the relocations (if present)")
parser.add_option("-u", "--unwind", dest = "bUnwind", default= False, action = "store_true", help = "Display the unwind info (if present)")
parser.add_option("-d", "--dynamic", dest = "bDynamic", default= False, action = "store_true", help = "Display the dynamic segment (if present)")
parser.add_option("-V", "--version-info", dest = "bVersionInfo", default= False, action = "store_true", help = "Display the version sections (if present)")
parser.add_option("-A", "--arch-specific", dest = "bArch", default = False, action = "store_true", help = "Display architecture specific information (if any)")
parser.add_option("-D", "--use-dynamic", dest = "bUseDynamic", default = False, action = "store_true", help = "Use the dynamic section info when displaying symbols")
parser.add_option("-x", "--hex-dump", dest = "hex_dump_number", default = 0, help = "Dump the contents of section <number>")
parser.add_option("-I", "--histogram", dest = "bHistogram", default = False, action = "store_true", help = "Display histogram of bucket list lengths")
parser.add_option("-W", "--debug-dump", dest = "wide", default = False, action = "store_true", help = "Allow output width to exceed 80 characters")
#-h is used for
#parser.add_option("-H", "--help", dest = "bHelp", default = False, action = "store_true", help = "Display this information")
parser.add_option("-v","--version", dest = "bVersion", default = False, action = "store_true", help = "Display the version number of readelf")
opts, args = parser.parse_args()
inputFile = sys.argv[-1]
if inputFile[0] == '-':
inputFile = ""
if opts.bVersion:
print __version__
#if not inputFile:
# return
if not inputFile:
sys.exit(0)
AbsPath = os.path.abspath(os.path.curdir)
print AbsPath
elfStruct = ElfStruct(inputFile)
if opts.bFileHeader:
elfStruct.ParseHeader()
if opts.bProgramHeader:
elfStruct.ParseProgramHeader()
if opts.bsection_headers:
elfStruct.ParseSectionHeader()
if opts.bSymbols:
elfStruct.ParseDynSymbolHeader()
elfStruct.ParseSymbolHeader()
if opts.bheader:
elfStruct.ParseHeader()
elfStruct.ParseProgramHeader()
elfStruct.ParseSectionHeader()
if opts.bAll:
elfStruct.ParseHeader()
elfStruct.ParseProgramHeader()
elfStruct.ParseSectionHeader()
elfStruct.ParseDynSymbolHeader()
elfStruct.ParseSymbolHeader()
if opts.bNotes:
print
if opts.bRelocs:
elfStruct.ParseRelocateStruct()
if opts.bUnwind:
print
if opts.bDynamic:
elfStruct.ParseDynamicStruct()
if opts.bVersionInfo:
print
if opts.bArch:
print
if opts.hex_dump_number:
print
if opts.bHistogram:
print
elfStruct.openfile.close()
参考文献：
（1）Tool Interface Standard(TIS)
Executable and Linking Format (ELF) Specification
（2）ELF文件格式
write by breadbox Email:breadbox@muppetlabs.com
译:alert7 < alert7@21cn.com >
（3）关于ELF文件格式的实验，发帖人hangj，http://www.pediy.com/bbshtml/bbs7/pediy7-15.htm
（4）《Dive Into Python》
（5）《Python核心编程》
（6）《Python语言入门》
（7）OptionParse in Python, 作者dummycat
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