aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
Diffstat (limited to '')
-rwxr-xr-xbfd/load.py113
-rw-r--r--bfd/test/test.c12
2 files changed, 117 insertions, 8 deletions
diff --git a/bfd/load.py b/bfd/load.py
index 6f8a0af..cfb9f58 100755
--- a/bfd/load.py
+++ b/bfd/load.py
@@ -1,4 +1,59 @@
#!/bin/python3
+from enum import Enum
+
+
+class sh_type_e:
+ SHT_NULL = 0x0
+ SHT_PROGBITS = 0x1
+ SHT_SYMTAB = 0x2
+ SHT_STRTAB = 0x3
+ SHT_RELA = 0x4
+ SHT_HASH = 0x5
+ SHT_DYNAMIC = 0x6
+ SHT_NOTE = 0x7
+ SHT_NOBITS = 0x8
+ SHT_REL = 0x9
+ SHT_SHLIB = 0xa
+ SHT_DYNSYM = 0xb
+ SHT_INIT_ARRAY = 0xe
+ SHT_FINI_ARRAY = 0xf
+ SHT_PREINIT = 0x10
+ SHT_GROUP = 0x11
+ SHT_SYMTAB_SHNDX = 0x12
+ SHT_NUM = 0x13
+ SHT_LOOS = 0x60000000
+
+
+class sh_flags_e:
+ SHF_WRITE = 0x1
+ SHF_ALLOC = 0x2
+ SHF_EXECINSTR = 0x4
+ SHF_MERGE = 0x10
+ SHF_STRINGS = 0x20
+ SHF_INFO_LINK = 0x40
+ SHF_LINK_ORDER = 0x80
+ SHF_OS_NONCONFORMING = 0x100
+ SHF_GROUP = 0x200
+ SHF_TLS = 0x400
+ SHF_MASKOS = 0x0ff00000
+ SHF_MASKPROC = 0xf0000000
+ SHF_ORDERED = 0x4000000
+ SHF_EXCLUDE = 0x8000000
+
+
+class p_type_e:
+ PT_NULL = 0x0
+ PT_LOAD = 0x1
+ PT_DYNAMIC = 0x2
+ PT_INTERP = 0x3
+ PT_NOTE = 0x4
+ PT_SHLIB = 0x5
+ PT_PHDR = 0x6
+ PT_LOOS = 0x60000000
+ PT_HIOS = 0x6FFFFFFF
+ PT_LOPROC = 0x70000000
+ PT_HIPROC = 0x7FFFFFFF
+
class Colors:
purple = '\033[95m'
@@ -80,6 +135,16 @@ class SHDR():
self.sh_entsize = sh_entsize
+class Symbol_Table_Entry64():
+ def __init__(self, st_name, st_info, st_other, st_shndx, st_value, st_size):
+ self.st_name = st_name
+ self.st_info = st_info
+ self.st_other = st_other
+ self.st_shndx = st_shndx
+ self.st_value = st_value
+ self.st_size = st_size
+
+
class ELF(object):
def __init__(self, so):
self.so = so
@@ -88,6 +153,7 @@ class ELF(object):
self.phdr = []
self.shhdr = []
self.size = int()
+ self.ste = []
def init(self, size):
self.size = size
@@ -131,7 +197,7 @@ class ELF(object):
def read_PHDR(self, size):
dummy = PHDR(0,0,0,0,0,0,0,0,0)
dummy.p_type = self.so.read(4)
- dummy.p_flags = self.so.read(4)
+ if size == 64: dummy.p_flags = self.so.read(4)
if size == 32: dummy.p_offset = self.so.read(4)
elif size == 64: dummy.p_offset = self.so.read(8)
if size == 32: dummy.p_vaddr = self.so.read(4)
@@ -160,16 +226,23 @@ class ELF(object):
elif size == 64: dummy.sh_offset = self.so.read(8)
if size == 32: dummy.sh_size = self.so.read(4)
elif size == 64: dummy.sh_size = self.so.read(8)
- if size == 32: dummy.sh_link = self.so.read(4)
- elif size == 64: pass
- if size == 32: dummy.sh_info = self.so.read(4)
- elif size == 64: pass
+ dummy.sh_link = self.so.read(4)
+ dummy.sh_info = self.so.read(4)
if size == 32: dummy.sh_addralign = self.so.read(4)
elif size == 64: dummy.sh_addralign = self.so.read(8)
if size == 32: dummy.sh_entsize = self.so.read(4)
elif size == 64: dummy.sh_entsize = self.so.read(8)
self.shhdr.append(dummy)
+ def read_st_entry(self, st):
+ dummy = Symbol_Table_Entry()
+ dummy.st_name = st[0:4]
+ dummy.st_info = st[4:5]
+ dummy.st_other = st[5:6]
+ dummy.st_shndx = st[6:8]
+ dummy.st_value = st[8:16]
+ dummy.st_size = st[16:24]
+
def dump_header(self):
print("------------------------------------------------------------------------------")
print(Colors.green + "elf header:" + Colors.ENDC)
@@ -226,6 +299,27 @@ class ELF(object):
print(Colors.blue + "sh_entsize: " + Colors.cyan + repr(self.shhdr[i].sh_entsize) + Colors.ENDC)
print("------------------------------------------------------------------------------")
+ def dump_symbol_tb(self):
+ for i in range(0, int.from_bytes(self.elfhdr.e_shnum, byteorder="little", signed=False)):
+ #print(repr(int.from_bytes(self.shhdr[i].sh_type, byteorder="little", signed=False)) + " : ", end='')
+ #print(int.from_bytes(self.shhdr[i].sh_size, byteorder="little", signed=False))
+ if int.from_bytes(self.shhdr[i].sh_type, byteorder="little", signed=False) == sh_type_e.SHT_SYMTAB:
+ self.so.seek(int.from_bytes(self.shhdr[i].sh_offset, byteorder="little", signed=False), 0)
+ #print(self.so.read(int.from_bytes(self.shhdr[i].sh_size, byteorder="little", signed=False)))
+ symbol_tb = self.so.read(int.from_bytes(self.shhdr[i].sh_size, byteorder="little", signed=False))
+ if int.from_bytes(self.shhdr[i].sh_type, byteorder="little", signed=False) == sh_type_e.SHT_DYNSYM:
+ self.so.seek(int.from_bytes(self.shhdr[i].sh_offset, byteorder="little", signed=False), 0)
+ #print(self.so.read(int.from_bytes(self.shhdr[i].sh_size, byteorder="little", signed=False)))
+ symbol_tb = self.so.read(int.from_bytes(self.shhdr[i].sh_size, byteorder="little", signed=False))
+ if int.from_bytes(self.shhdr[i].sh_type, byteorder="little", signed=False) == sh_type_e.SHT_STRTAB:
+ self.so.seek(int.from_bytes(self.shhdr[i].sh_offset, byteorder="little", signed=False), 0)
+ #print(self.so.read(int.from_bytes(self.shhdr[i].sh_size, byteorder="little", signed=False)))
+ symbol_tb = self.so.read(int.from_bytes(self.shhdr[i].sh_size, byteorder="little", signed=False))
+ #print(symbol_tb.decode("utf-8"))
+ for byte in symbol_tb:
+ print(chr(byte), end='')
+ if chr(byte) == '\0': print()
+
def ch_so_to_exe(path):
so = open(path, "r+b")
@@ -237,8 +331,8 @@ def ch_so_to_exe(path):
def ch_exe_to_so(path):
so = open(path, "r+b")
- so.seek(16, 0)
- so.write(bytes(3))
+ so.seek(16)
+ so.write(bytes([3]))
print(Colors.purple + "changed exe to so" + Colors.ENDC)
@@ -246,15 +340,18 @@ def main():
so = openSO_r("./test/test.so")
elf = ELF(so)
elf.init(64)
- elf.dump_header()
+ #elf.dump_header()
+ elf.dump_symbol_tb()
#elf.dump_phdrs()
#elf.dump_shdrs()
+ '''
so.close()
ch_so_to_exe("./test/test.so")
so = openSO_r("./test/test.so")
elf2 = ELF(so)
elf2.init(64)
elf.dump_header()
+ '''
if __name__ == "__main__":
main()
diff --git a/bfd/test/test.c b/bfd/test/test.c
index 0327658..fe2932c 100644
--- a/bfd/test/test.c
+++ b/bfd/test/test.c
@@ -1,5 +1,17 @@
#include "stdio.h"
+int myfunc1(void) {return 1;}
+int myfunc2(void) {return 2;}
+int myfunc3(void) {return 3;}
+int myfunc4(void) {return 4;}
+int myfunc5(void) {return 5;}
+int myfunc6(void) {return 6;}
+
+int myvar1 = 1;
+int myvar2 = 2;
+int myvar3 = 3;
+int myvar4 = 4;
+
int main(int argc, char** argv) {
printf("i live!\n");
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-04 12:48:14 +0000