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elf32_reader.py
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#!/usr/bin/python3.3m
# -*- coding: utf-8 -*-
#
# elf32_reader.py
# 功能读取 elf 文件的表
# 用法 python3.3m elf32_reader.py elf文件名
# eg python3.3m a.out
#
import struct
from sys import argv,stderr
#typedef struct
#{
# unsigned char e_ident[EI_NIDENT]; /* Magic number and other info */
# Elf32_Half e_type; /* Object file type */
# Elf32_Half e_machine; /* Architecture */
# Elf32_Word e_version; /* Object file version */
# Elf32_Addr e_entry; /* Entry point virtual address */
# Elf32_Off e_phoff; /* Program header table file offset */
# Elf32_Off e_shoff; /* Section header table file offset */
# Elf32_Word e_flags; /* Processor-specific flags */
# Elf32_Half e_ehsize; /* ELF header size in bytes */
# Elf32_Half e_phentsize; /* Program header table entry size */
# Elf32_Half e_phnum; /* Program header table entry count */
# Elf32_Half e_shentsize; /* Section header table entry size */
# Elf32_Half e_shnum; /* Section header table entry count */
# Elf32_Half e_shstrndx; /* Section header string table index */
#} Elf32_Ehdr;
#elf 32 头文件格工
Elf32_Ehdr_format="=16B2H5I6H"
#typedef struct
#{
# Elf32_Word sh_name; /* Section name (string tbl index) */
# Elf32_Word sh_type; /* Section type */
# Elf32_Word sh_flags; /* Section flags */
# Elf32_Addr sh_addr; /* Section virtual addr at execution */
# Elf32_Off sh_offset; /* Section file offset */
# Elf32_Word sh_size; /* Section size in bytes */
# Elf32_Word sh_link; /* Link to another section */
# Elf32_Word sh_info; /* Additional section information */
# Elf32_Word sh_addralign; /* Section alignment */
# Elf32_Word sh_entsize; /* Entry size if section holds table */
#} Elf32_Shdr;
Elf32_Shdr_format="=10I"
#typedef struct
#{
# Elf32_Word p_type; /* Segment type */
# Elf32_Off p_offset; /* Segment file offset */
# Elf32_Addr p_vaddr; /* Segment virtual address */
# Elf32_Addr p_paddr; /* Segment physical address */
# Elf32_Word p_filesz; /* Segment size in file */
# Elf32_Word p_memsz; /* Segment size in memory */
# Elf32_Word p_flags; /* Segment flags */
# Elf32_Word p_align; /* Segment alignment */
#} Elf32_Phdr;
Elf32_Phdr_format='=8I'
def main():
filename=argv[1]
file=open(filename,'rb')
elf32_header=struct.unpack(Elf32_Ehdr_format,file.read(struct.calcsize(Elf32_Ehdr_format)))
print ("ELF头：")
Magic=""
for each_magic in elf32_header[0:16]:
Magic+='%02x '%each_magic
print (" Magic: ",Magic)
# 读取e_ident[4] 文件类型
if elf32_header[4]==1:
Class="ELF32"
elif elf32_header[4]==2:
Class="ELF64"
else:
print("非法的类别",file=stderr)
exit(1)
print ("Class: ",Class)
# 读取e_ident[5] 编码方式
if elf32_header[5]==1:
Data="2's complement,little endian"
elif elf32_header[5]==2:
Data="2's complement,little endian"
else:
print("非法数据编码",file=stderr)
exit(1)
print ("Data: ",Data)
#读取e_ident[6] 版本
if elf32_header[6]==1:
version='1(current)'
else:
print("非法版本号",file=stderr)
exit(1)
print("Version: ",version)
#读取e_ident[7] OS ABI
osAbi={0:'UNIX-System V',1:'HP-UX',2:'NetBSD',3:'GNU/Linux',\
6:'Solaris',7:'IBM AIX',8:'SGI Irix',9:'FreeBSD',\
10:'Compaq Tru64 unix',11:'Novell Modesto',12:'OpenBSD',\
64:'ARM EABI',97:'ARM',255:'Standalone'}
print("OS/ABI:",osAbi[elf32_header[7]])
#ABI version
print ("ABI Version: ",str(elf32_header[8]))
Type=['未知目标文件格式','可重定位文件','可执行文件','共享目标文件','Core文件']
print("Type: ",Type[elf32_header[16]])
machine=['undefine','AT&T WE 32100','SPARC','Intel 80386','Motorla 68000',\
'Motorola 88000','Intel 80860','MIPS RS3000','others']
print('Machine: ',machine[elf32_header[17]])
print ('Version: %#x'%elf32_header[18])
print('入口点地址： %#x'%elf32_header[19])
print('程序头起点： %d(bytes into file)'%elf32_header[20])
print('Start of section headers: %d(bytes into file)'%elf32_header[21])
print ('标志： %#x'%elf32_header[22])
#ELF头大小 所有的头应该一样吧？ 进地校验吗？
print('本头的大小： %d(字节）'%elf32_header[23])
#所有程序头部表格的表项大小 大小一致
print ('程序头大小：%d(字节）'%elf32_header[24])
print ('Number of program headers: %d'%elf32_header[25])
print ('节头大小： %d(字节）'%elf32_header[26])
print ('节头数量： %d'%elf32_header[27])
print ('字符串表索引节头： %d'%elf32_header[28])
#读取节区头部表
print('节头：')
print('[Nr] Name Type Addr Off Size \
ES Flg LK Inf Al')
file.seek(elf32_header[21])
elf32_sheaders=[]
for i in range(elf32_header[27]):
elf32_sheaders.append(struct.unpack(Elf32_Shdr_format,file.read(struct.calcsize(Elf32_Shdr_format))))
secgroup=[]
symtable=[]
section_name=[]
dynamic=[]
rel_section=[]
for i in range(elf32_header[27]):
print('[%2d]'%i,end=' ')
sh_name=''
offset=elf32_sheaders[elf32_header[28]][4]+elf32_sheaders[i][0]
file.seek(offset,0)
while True:
ch=struct.unpack('=c',file.read(1))
if ch[0].decode('ascii')!='\0':
sh_name+=ch[0].decode('ascii')
else:
break
print("%-20s"%sh_name,end=' ')
section_name.append(sh_name)
sh_type={0:'NULL',1:'program data',2:'Symbol table',3:'String table',4:'Relocation entries',\
5:'Symbol hash table',6:'Dynamic linking information',7:'Notes',\
8:'Program space with no data(bbs)',9:'Relocation entries',10:'Reserved',\
11:'Dynamic linker symbol table', 14:'Array of constructors',15:'Arrsy of destructors',\
16:'Array of pre-constructors',17:'Section group',18:'Extended section indeces',\
19:'Number of defined types',0x60000000:'Start OS-specific', 0x6ffffff5:'Object attributes',\
0x6ffffff6:'GNU-style hash table',0x6ffffff7:'Prelink library list',\
0x6ffffff8:'Checksum for DSO content',0x6ffffffa:'Sun-specific low bound',\
0x6ffffffb:'Version definition section',0x6ffffffc:'Version definition section',\
0x6ffffffd:'Version definition section',0x6ffffffe:'Version needs section',\
0x6fffffff:'Version symbol table', 0x70000000:'Start of proceessor-specific',\
0x7fffffff:'End of proceesor-specific',0x80000000:'Start of application-specific',\
0x8fffffff:'End of application-specific'}
print('%-30s'%sh_type[elf32_sheaders[i][1]],end=' ')
if elf32_sheaders[i][1]==17:
secgroup.append(i)
if elf32_sheaders[i][1] in [2,11]:
symtable.append((elf32_sheaders[i],i))
if elf32_sheaders[i][1]==6:
dynamic.append(elf32_sheaders[i])
if elf32_sheaders[i][1]==9:
rel_section.append((elf32_sheaders[i],i,9))
if elf32_sheaders[i][1]==4:
rel_section.append((elf32_sheaders[i],i,4))
print("%08x "%elf32_sheaders[i][3],end=' ')
print ("%06x "%elf32_sheaders[i][4],end=' ')
print ("%06x "%elf32_sheaders[i][5],end=' ')
print("%02x "%elf32_sheaders[i][9],end=' ')
flg=''
if elf32_sheaders[i][2]&(1<<0):
flg+='W'
if elf32_sheaders[i][2]&(1<<1):
flg+='A'
if elf32_sheaders[i][2]&(1<<2):
flg+='X'
if elf32_sheaders[i][2]&(1<<4):
flg+='M'
if elf32_sheaders[i][2]&(1<<5):
flg+='S'
if elf32_sheaders[i][2]&(1<<6):
flg+='I'
if elf32_sheaders[i][2]&(1<<7):
flg+='L'
if elf32_sheaders[i][2]&(1<<9):
flg+='G'
if elf32_sheaders[i][2]&(1<<10):
flg+='T'
if elf32_sheaders[i][2]&(1<<31):
flg+='E'
if elf32_sheaders[i][2]&(1<<8):
flg+='O'
if elf32_sheaders[i][2]==0x0ff00000:
flg+='o'
if elf32_sheaders[i][2]==0xf0000000:
flg+='p'
if elf32_sheaders[i][2]!=0 and flg=='':
flg+='x'
print('%-4s'%flg,end=' ')
print('%-d '%elf32_sheaders[i][6],end=' ')
print('%-d '%elf32_sheaders[i][7],end=' ')
print('%-d'%elf32_sheaders[i][8])
print('Key to Flags:')
print( '''W(write),A(alloc),X(execute),M(merge),s(strings)
I(info),L(link order),G(group),T(TLS),E(exclude),x(unknown)
O(extra OS processing required) o(OS specific),p(processor specific''')
if len(secgroup)==0:
print('There are no section groups in this file')
else:
#目前不知道如何处理！！！
print('目前不知道如何处理！！！')
#读取程序头
print('程序头：')
print('%-12s%-10s%-10s%-10s%-10s%-10s%-4s%-8s'%('Type','Offset','VirtAddr',\
'PhysAddr','FileSiz','MemSiz','Flg','Align'))
file.seek(elf32_header[20])
elf32_phdrs=[]
for i in range(elf32_header[25]):
elf32_phdrs.append(struct.unpack(Elf32_Phdr_format,file.read(struct.calcsize(Elf32_Phdr_format))))
for i in range(elf32_header[25]):
#读取type
p_types={0:'NULL',1:'LOAD',2:'DYNAMIC',3:'INTERP',4:'NOTE',5:'SHLIB',\
6:'PHDR',7:'TLS',8:'NUM',0x60000000:'LOOS',0x6474e550:'GUN_EH_FRAME',\
0x6474e551:'GNU_STACK',0x6474e552:'GNU_RELRO',0x6ffffffa:'Sun specific',\
0x6ffffffb:'SUNWSTACK',0x6fffffff:'HIOS',0x70000000:'LOPROC',0x7fffffff:'HIPROC'}
print("%-12s"%p_types[elf32_phdrs[i][0]],end=' ')
print("%#08x "%elf32_phdrs[i][1],end=' ')
print("%#08x "%elf32_phdrs[i][2],end=' ')
print('%#08x '%elf32_phdrs[i][3],end=' ')
print('%#08x '%elf32_phdrs[i][4],end=' ')
print('%#08x '%elf32_phdrs[i][5],end=' ')
flg=''
if elf32_phdrs[i][6]&(1<<2):
flg+='R'
if elf32_phdrs[i][6]&(1<<1):
flg+='W'
if elf32_phdrs[i][6]&(1<<0):
flg+='E'
if elf32_phdrs[i][6]==0x0ff00000:
flg+='O'
if elf32_phdrs[i][6]==0xf0000000:
flg+='P'
print('%-4s'%flg,end=' ')
print('%-#x'%elf32_phdrs[i][7])
print('Section to Segment mapping:')
print('段节：')
for i in range(elf32_header[25]):
print('{:02d} '.format(i),end=' ')
sections=''
for j in range(elf32_header[27]):
if elf32_sheaders[j][4]>=elf32_phdrs[i][1] and elf32_sheaders[j][4]<(elf32_phdrs[i][1]+elf32_phdrs[i][4]):
sections+=' '+section_name[j]
print(sections)
if len(dynamic)==0:
print('No Dynamic section found')
else:
dynamic_format='=II'
for eachentry in dynamic:
dynamic_table=[]
dynamic_sections=[]
file.seek(eachentry[4])
while True:
dynamic_section=struct.unpack(dynamic_format,file.read(struct.calcsize(dynamic_format)))
dynamic_sections.append(dynamic_section)
if dynamic_section[0]==0:
break
for dynamic_section in dynamic_sections:
dynamic_entry=[]
dynamic_entry.append(dynamic_section[0])
dynamic_type={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:'FINT',14:'SONAME',15:'RPATH',16:'SYMBOLIC',17:'REL',\
18:'RELSZ',19:'RELENT',20:'PLTREL',21:'DEBUG',22:'TEXTREL',23:'JMPREL',\
24:'BIND_NOW',25:'INIT_ARRAY',26:'FINT_ARRAY',27:'INITARRAYSZ',28:'FINT_ARRAYSZ',\
29:'RUNPATH',30:'FLAGS',32:'ENCODING',33:'PREINIT_ARRAYSZ',34:'NUM',0x6000000d:'LOOPS',\
0x6ffff000:'HIOS',0x70000000:'LOPROC',0x7fffffff:'HIPROC',0x6ffffd00:'VALRNGLO',\
0x6ffffdf5:'PRELINKED',0x6ffffdf6:'CONFLISTSZ',0x6ffffdf7:'LIBLISTSZ',\
0x6ffffdf8:'CHECKSUM',0x6ffffdf9:'PLTPADSZ',0x6ffffdfa:'MOVEENT',\
0x6ffffdfb:'MOVESZ',0x6ffffdfc:'FEATURE_1',0x6ffffdfd:'POSFLAG_1',\
0x6ffffdfe:'SYMINSZ',0x6ffffdff:'SYMINENT',0x6ffffe00:'ADDRRNGLO',\
0x6ffffef5:'GUN_HASH',0x6ffffef6:'TLSDESC_PLT',0x6ffffef7:'TLSDESC_GOT',\
0x6ffffdf8:'GNU_CONFLICT',0x6ffffef9:'GNU_LIBLIST',\
0x6ffffefa:'CONFIG',0x6ffffefb:'DEPAUDIT',0x6ffffefc:'AUDIT',\
0x6ffffefd:'PLTPAD',0x6ffffefe:'MOVETAB',0x6ffffeff:'SYMINFO',\
0x6ffffff0:'VERSYM',0x6ffffffa:'RELCOUNT',0x6fffffb:'FLAGS_1',\
0x6ffffffc:'VERDEF',0x6ffffffd:'VERDEFNUM',0x6fffffff:'VERNEEDNUM',\
0x7ffffffd:'AUXILIARY',0x7fffffff:'FILTER'}
try:
dynamic_entry.append('('+dynamic_type[dynamic_section[0]]+')')
except:
dynamic_entry.append('('+'%#x'%dynamic_section[0]+')')
d_tag=dynamic_section[0]
if d_tag in [0,3,4,5,6,7,12,13,15]:
dynamic_entry.append('%#x'%dynamic_section[1])
elif d_tag==1:
file.seek(elf32_sheaders[eachentry[6]][4]+dynamic_section[1])
lib_name=''
while True:
ch=struct.unpack('=c',file.read(1))
if ch[0].decode('ascii')!='\0':
lib_name+=ch[0].decode('ascii')
else:
break
dynamic_entry.append('共享库：['+lib_name+']')
elif d_tag in [2,8,9,10,11,18,19]:
dynamic_entry.append('%d (bytes)'%dynamic_section[1])
elif d_tag==14:
file.seek(elf32_sheaders[eachentry[6]][4]+dynamic_section[1])
lib_name=''
while True:
ch=struct.unpack('=c',file.read(1))
if ch[0].decode('ascii')!='\0':
lib_name+=ch[0].decode('ascii')
else:
break
dynamic_entry.append('Library soname:['+lib_name+']')
else:
dynamic_entry.append('不清楚此节区%#x'%dynamic_section[1] )
dynamic_table.append(dynamic_entry)
print('Dynamic section at offset %#x contains %d entries:'%(eachentry[4],len(dynamic_table)))
print('{0:^10}{1:^20}{2:^10}'.format('标记','类型',"名称/值"))
for eachentry in dynamic_table:
print('%#010x %-12s %-20s'%(eachentry[0],eachentry[1],eachentry[2]))
if len(rel_section)==0:
print('未发现重定位节。')
else:
for eachentry,i,n in rel_section:
print("重定位节'%s'位于偏移量 %#x 含有 %d 个条目："%(section_name[i],eachentry[4],int(eachentry[5]/eachentry[9])))
print('{0:^10}{1:^10}{2:^20}{3:^20}{4:^30}'.format('Offset','Info','Type','Sym.Value','Sym.Name'))
if n==9:
rel_format='=2I'
elif n==4:
rel_format='=3I'
file.seek(eachentry[4])
rel_sections=[]
for i in range(int(eachentry[5]/eachentry[9])):
rel_section=struct.unpack(rel_format,file.read(struct.calcsize(rel_format)))
rel_sections.append(rel_section)
for rel_section in rel_sections:
print('%08x'%rel_section[0],end=' ')
print('%08x'%rel_section[1],end=' ')
rel_types=['R_386_NONE','R_386_32','R_386_PC32',\
'R_386_GOT32','R_386_PLT32','R_386_COPY',\
'R_386_GLOB_DAT','R_386_JMP_SLOT','R_386_RELATIVE',\
'R_386_GOTOFF','R_386_GOTPC']
print('%-20s'%rel_types[rel_section[1]&0xff],end=' ')
file.seek(elf32_sheaders[eachentry[6]][4]+(rel_section[1]>>8)*elf32_sheaders[eachentry[6]][9])
sym=struct.unpack('=3I2BH',file.read(struct.calcsize('=3I2BH')))
print('%08x'%sym[1],end=' ')
file.seek(elf32_sheaders[elf32_sheaders[eachentry[6]][6]][4]+sym[0])
sym_name=''
while True:
ch=struct.unpack('=c',file.read(1))
if ch[0].decode('ascii')!='\0':
sym_name+=ch[0].decode('ascii')
else:
break;
print('%-20s'%sym_name)
if len(symtable)==0:
print('未发现符号表')
else:
for eachentry,i in symtable:
print("Symbol table '%s' contains %d entries:"%(section_name[i],int(eachentry[5]/eachentry[9])))
print(' Num: Value: Size Type Bind Vis Ndx Name')
file.seek(eachentry[4])
symentrys=[]
for i in range(int(eachentry[5]/eachentry[9])):
symentrys.append(struct.unpack('=3I2BH',file.read(struct.calcsize('=3I2BH'))))
i=0
for symentry in symentrys:
print('%4d'%i,end=' ')
print('%08x'%symentry[1],end=' ')
print('%4d'%symentry[2],end=' ')
symtypes={0:'NOTYPE',1:'OBJECT',2:'FUNC',3:'SECTION',4:'FILE',5:'COMMON',\
6:'TLS',7:'NUM',10:'LOOS',12:'HIOS',13:'LOPROC',15:'HIPROC'}
print("-%8s"%symtypes[symentry[3]&0xf],end=' ')
binds={0:'LOCAL',1:'GLOBAL',2:'WEAK',3:'NUM',10:'LOOS',12:'HIOS',13:'LOPROC',15:'HIPROC'}
print('%-8s'%binds[symentry[3]>>4],end=' ')
viss=['DEFAULT','INTERNAL','HIDDEN','RPOTECTED']
print('%-8s'%viss[symentry[4]&0x03],end=' ')
if symentry[5]==0:
print('UND',end=' ')
else:
print('%3d'%symentry[5],end=' ')
file.seek(elf32_sheaders[eachentry[6]][4]+symentry[0])
sym_name=''
while True:
ch=struct.unpack('=c',file.read(1))
if ch[0].decode('ascii')!='\0':
sym_name+=ch[0].decode('ascii')
else:
break;
print('%-20s'%sym_name)
file.close()
return 0
if __name__ == '__main__':
main()