342 lines
14 KiB
Python
Executable File
342 lines
14 KiB
Python
Executable File
#!/usr/bin/env python3
|
|
|
|
# Multicast client
|
|
# Adapted from: http://chaos.weblogs.us/archives/164
|
|
|
|
import socket
|
|
import os
|
|
from os import path
|
|
import struct
|
|
import sys
|
|
|
|
import time
|
|
import random
|
|
|
|
from snefru_hash import append_snefru
|
|
|
|
|
|
|
|
|
|
ATBOOT_BLOCK_SIZE = 256 # must be a multiple of 64 or snefru will choke
|
|
|
|
UNRELIABILITY_PERCENT = 0
|
|
def failchance():
|
|
return (random.random() < UNRELIABILITY_PERCENT/100)
|
|
|
|
my_unique_ltoudp_id = b'El' + (os.getpid() & 0xFFFF).to_bytes(2, 'big')
|
|
|
|
|
|
image = open('ChainLoader.bin', 'rb').read()
|
|
image2 = sys.argv[1:]
|
|
image2dict = {}
|
|
for img2name in image2:
|
|
img2 = open(img2name, 'rb').read()
|
|
img2name = path.basename(img2name)
|
|
while len(img2) % 512: img2 += b'\0'
|
|
image2dict[img2name] = bytearray(img2)
|
|
|
|
img2name = img2name.encode('mac_roman')
|
|
# image += struct.pack('>LB', len(img2)//512, len(img2name)) + img2name
|
|
while len(image) % 2: image += b'\0'
|
|
|
|
# Constraint: client crashes when there is only one block
|
|
while len(image) <= ATBOOT_BLOCK_SIZE: image += b'\0'
|
|
|
|
# Constraint: client expects hash in the last 64 bytes of the last block
|
|
while len(image) % ATBOOT_BLOCK_SIZE != ATBOOT_BLOCK_SIZE - 64: image += b'\0'
|
|
image = append_snefru(image)
|
|
|
|
writable_image = bytearray(open('A608.dsk', 'rb').read())
|
|
|
|
open('/tmp/imgdebug', 'wb').write(image)
|
|
|
|
# typedef short (*j_code)( short command, # SP+4 (sign-extend to long)
|
|
# DGlobals *g, # SP+8
|
|
# int **var1, # SP+12
|
|
# int **var2); # SP+16
|
|
|
|
# We return our OSErr in d0, and leave the 16 bytes of arguments on the stack for the caller to clean
|
|
|
|
|
|
ANY = "0.0.0.0"
|
|
MCAST_ADDR = "239.192.76.84"
|
|
MCAST_PORT = 1954
|
|
|
|
# Create a UDP socket
|
|
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP) # IPPROTO_UDP could just be 0
|
|
|
|
# Allow multiple sockets to use the same PORT number
|
|
sock.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1)
|
|
sock.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEPORT,1)
|
|
|
|
# Bind to the port that we know will receive multicast data
|
|
sock.bind((ANY,MCAST_PORT))
|
|
|
|
# Tell the kernel that we want to add ourselves to a multicast group
|
|
# The address for the multicast group is the third param
|
|
status = sock.setsockopt(socket.IPPROTO_IP,
|
|
socket.IP_ADD_MEMBERSHIP,
|
|
socket.inet_aton(MCAST_ADDR) + socket.inet_aton(ANY))
|
|
|
|
|
|
|
|
# Wrap up in all sorts of crap...
|
|
def mk_ddp(dest_node, dest_socket, src_node, src_socket, proto_type, data):
|
|
# Wrap into DDP datagram
|
|
data = struct.pack('>HBBB', len(data) + 5, dest_socket, src_socket, proto_type) + data
|
|
|
|
# Wrap into LLAP packet
|
|
data = struct.pack('>BBB', dest_node, src_node, 1) + data
|
|
|
|
# Wrap the novel LToUDP header
|
|
data = my_unique_ltoudp_id + data
|
|
|
|
return data
|
|
|
|
def send(ddp):
|
|
if failchance(): return
|
|
sock.sendto(ddp, (MCAST_ADDR, MCAST_PORT))
|
|
|
|
|
|
|
|
|
|
def pstring(x):
|
|
try:
|
|
x = x.encode('mac_roman')
|
|
except AttributeError:
|
|
pass
|
|
|
|
return bytes([len(x)]) + x
|
|
|
|
|
|
|
|
buf_sequence = -1
|
|
|
|
|
|
|
|
while 1:
|
|
data, addr = sock.recvfrom(1024)
|
|
|
|
# Okay... LToUDP parsing here. Let's start with the LLAP packet.
|
|
# Man, chaining protocols is hard. This will inevitably require a rewrite.
|
|
# Be careful to keep this as one cascading thing...
|
|
|
|
if len(data) < 4: continue
|
|
if data.startswith(my_unique_ltoudp_id): continue
|
|
data = data[4:] # Trim down to LLAP packet (not "frame")
|
|
|
|
if len(data) < 3: continue
|
|
llap_dest_node = data[0]
|
|
llap_src_node = data[1]
|
|
llap_proto_type = data[2]
|
|
data = data[3:] # Trim down to LLAP payload
|
|
|
|
# Try to extract a DDP header, which is all we want!
|
|
if llap_proto_type == 1:
|
|
# ddp, short
|
|
if len(data) < 5: continue
|
|
ddp_len, ddp_dest_socket, ddp_src_socket, ddp_proto_type = struct.unpack_from('>HBBB', data)
|
|
data = data[5:ddp_len]
|
|
elif llap_proto_type == 2:
|
|
# ddp, long (what should we do with this extra information?)
|
|
if len(data) < 13: continue
|
|
ddp_len, ddp_cksum, ddp_dest_net, ddp_src_net, ddp_dest_node, ddp_src_node, ddp_dest_socket, ddp_src_socket = struct.unpack_from('>4H5B', data)
|
|
ddp_hop_count = (ddp_len >> 10) & 0xF
|
|
ddp_len &= 0x3FF
|
|
data = data[13:ddp_len]
|
|
else:
|
|
# llap control packet -- can probably ignore!
|
|
continue
|
|
|
|
print(f'datagram {llap_src_node}:{ddp_src_socket}->{llap_dest_node}:{ddp_dest_socket}', end=' ')
|
|
|
|
if ddp_proto_type == 2:
|
|
# Name Binding Protocol
|
|
|
|
if len(data) < 2: continue
|
|
nbp_func = data[0] >> 4
|
|
nbp_tuple_cnt = data[0] & 0xF
|
|
nbp_id = data[1]
|
|
data = data[2:]
|
|
|
|
nbp_tuples = []
|
|
while data and len(nbp_tuples) < nbp_tuple_cnt:
|
|
if len(data) < 5: break
|
|
this_tuple = list(struct.unpack_from('>HBBB', data))
|
|
data = data[5:]
|
|
for i in range(3):
|
|
# This should be coded more defensively, perhaps using exceptions
|
|
this_tuple.append(data[1:1+data[0]].decode('mac_roman'))
|
|
data = data[1+data[0]:]
|
|
nbp_tuples.append(tuple(this_tuple))
|
|
|
|
|
|
print('nbp func', nbp_func, 'id', nbp_id)
|
|
for t in nbp_tuples:
|
|
print(f' net:node:sock={t[0]}:{t[1]}:{t[2]} enum={t[3]} object:type@zone={t[4]}:{t[5]}@{t[6]}')
|
|
|
|
if nbp_func == 2:
|
|
# NBP LkUp
|
|
|
|
if len(nbp_tuples) == 1 and nbp_tuples[0][5] == 'BootServer': # Looking for us
|
|
send(mk_ddp(
|
|
dest_node=llap_src_node, dest_socket=ddp_src_socket,
|
|
src_node=99, src_socket=99,
|
|
proto_type=2,
|
|
data=bytes([0x31, nbp_id]) + # 3=LkUp-Reply, 1=number-of-tuples
|
|
struct.pack('>HBBB', # Pack the first tuple
|
|
0, # (My) Network number
|
|
99, # (My) Node ID
|
|
99, # (My) Socket number
|
|
0, # (My) Enumerator (i.e. which of many possible names for 99/99 is this?)
|
|
) +
|
|
pstring(nbp_tuples[0][4]) + pstring('BootServer') + pstring('*')
|
|
))
|
|
|
|
elif ddp_proto_type == 10:
|
|
# Mysterious ATBOOT protocol
|
|
|
|
if len(data) < 2: continue
|
|
boot_type, boot_vers = struct.unpack_from('>BB', data)
|
|
whole_data = data
|
|
data = data[2:]
|
|
|
|
# rbNullCommand EQU 0 ; ignore this one
|
|
# rbMapUser EQU 1 ; user record request
|
|
# rbUserReply EQU 2 ; user record reply
|
|
# rbImageRequest EQU 3 ; image request & bitmap
|
|
# rbImageData EQU 4 ; image data
|
|
# rbImageDone EQU 5 ; server done with current image
|
|
# rbUserRecordUpdate EQU 6 ; new user info to server
|
|
# rbUserRecordAck EQU 7 ; info received from server
|
|
|
|
if boot_type == 1:
|
|
# It might be neater to trim off the "type" and "version" fields a bit earlier
|
|
boot_machine_id, boot_timestamp, boot_username = struct.unpack_from('>HL 34p', data)
|
|
|
|
print(f'atboot type={boot_type}, vers={boot_vers}, machineID={boot_machine_id}, userName={boot_username}')
|
|
|
|
# // This defines a user record.
|
|
# // Some of these fields can be determined on the fly by the boot server,
|
|
# // while others are stored on disk by the boot server
|
|
# typedef struct
|
|
# {
|
|
# char serverName[serverNameLength]; // server name to boot off of
|
|
# char serverZone[zoneNameLength]; // and the zone it lives in
|
|
# char serverVol[volNameLength]; // the volume name
|
|
# short serverAuthMeth; // authentication method to use (none, clear txt, rand)
|
|
# unsigned long sharedSysDirID; // dir id of shared system folder
|
|
# unsigned long userDirID; // dir id of the user's private system folder
|
|
# unsigned long finderInfo[8]; // blessed folder dir id, startup folder dir id etc...
|
|
# unsigned char bootBlocks[138]; // see Inside Mac V-135
|
|
# unsigned short bootFlag; // server based flags
|
|
# unsigned char pad[306-18]; // <pd 5>pad to ddpMaxData
|
|
# }userRecord;
|
|
|
|
# // This defines the user record reply sent to workstations.
|
|
# typedef struct
|
|
# {
|
|
# unsigned char Command; /* record or image request command word */
|
|
# unsigned char pversion; /* version of boot protocol spoken by requestor */
|
|
# unsigned short osID; /* type and version of os */
|
|
# unsigned int userData; /* time stamp goes here */
|
|
# unsigned short blockSize; /* size of blocks we will send */
|
|
# unsigned short imageID; /* image ID */
|
|
# short result; /* error codes */
|
|
# unsigned int imageSize; /* size of image in blocks */
|
|
# userRecord userRec; /* tell user where to go */
|
|
# }BootPktRply;
|
|
|
|
# Ignore the silly user record. Just make the fucker work!
|
|
send(mk_ddp(
|
|
dest_node=llap_src_node, dest_socket=ddp_src_socket,
|
|
src_node=99, src_socket=99,
|
|
proto_type=10,
|
|
data=struct.pack('>BBHLHHhL', 2, 1, boot_machine_id, boot_timestamp, ATBOOT_BLOCK_SIZE, 0, 0, len(image) // ATBOOT_BLOCK_SIZE).ljust(586, b'\0')
|
|
))
|
|
|
|
elif boot_type == 3:
|
|
# It seems to want part of the boot image!
|
|
# print('it wants data', data)
|
|
|
|
# typedef struct
|
|
# {
|
|
# unsigned short imageID; /* */
|
|
# unsigned char section; /* "section" of the image the bitmap refers to */
|
|
# unsigned char flags; /* ??? */
|
|
# unsigned short replyDelay;
|
|
# unsigned char bitmap[512]; /* bitmap of the section of the image requested */
|
|
# }bir; // Boot Image Req
|
|
|
|
print('Boot Image Req')
|
|
|
|
if len(data) < 6: continue
|
|
boot_image_id, boot_section, boot_flags, boot_reply_delay = struct.unpack_from('>HBBH', data)
|
|
data = data[6:]
|
|
|
|
# Okay, pretty much just send the bits that were requested!
|
|
print('Sending blocks')
|
|
for blocknum in range(len(image) // ATBOOT_BLOCK_SIZE):
|
|
# if len(data) > blocknum // 8 and (data[blocknum // 8] >> (blocknum % 8)) & 1:
|
|
if 1:
|
|
# typedef struct {
|
|
# unsigned char packetType; /* The command number */
|
|
# unsigned char packetVersion; /* Protocol version number */
|
|
# unsigned short packetImage; /* The image this block belongs to */
|
|
# unsigned short packetBlockNo; /* The block of the image (starts with 1) */
|
|
# unsigned char packetData[512];/* the data portion of the packet */
|
|
# } BootBlock,*BootBlockPtr;
|
|
|
|
# print(f' {blocknum}', end='', flush=True)
|
|
send(mk_ddp(
|
|
dest_node=llap_src_node, dest_socket=ddp_src_socket,
|
|
src_node=99, src_socket=99,
|
|
proto_type=10,
|
|
data=struct.pack('>BBHH', 4, 1, boot_image_id, blocknum) + image[blocknum*ATBOOT_BLOCK_SIZE:blocknum*ATBOOT_BLOCK_SIZE+ATBOOT_BLOCK_SIZE]
|
|
))
|
|
|
|
# time.sleep(0.5)
|
|
# break # wait for another request, you mofo!
|
|
|
|
elif boot_type == 128:
|
|
boot_seq, boot_imgnum, boot_blkoffset, boot_blkcnt = struct.unpack_from('>HLLL', data); boot_imgname = b'A608.dsk'
|
|
boot_blkcnt = min(boot_blkcnt, 32)
|
|
boot_imgname = boot_imgname.decode('mac_roman')
|
|
for blk in range(boot_blkoffset, boot_blkoffset + boot_blkcnt):
|
|
thisblk = writable_image[blk*512:blk*512+512]
|
|
send(mk_ddp(
|
|
dest_node=llap_src_node, dest_socket=ddp_src_socket,
|
|
src_node=99, src_socket=99,
|
|
proto_type=10,
|
|
data=struct.pack('>BBH', 129, blk-boot_blkoffset, boot_seq) + thisblk
|
|
))
|
|
|
|
elif boot_type == 130:
|
|
boot_type, blk, seq, boot_imgnum, hunk_start = struct.unpack_from('>BBHLL', whole_data)
|
|
if seq != buf_sequence:
|
|
buf_sequence = seq
|
|
buf = bytearray(32*512)
|
|
|
|
putdata = whole_data[8:]
|
|
buf[(blk % 32) * 512:(blk % 32) * 512 + len(putdata)] = putdata
|
|
|
|
if blk & 0x80:
|
|
del buf[(blk % 32) * 512 + 512:]
|
|
writable_image[hunk_start*512:hunk_start*512+len(buf)] = buf
|
|
|
|
send(mk_ddp(
|
|
dest_node=llap_src_node, dest_socket=ddp_src_socket,
|
|
src_node=99, src_socket=99,
|
|
proto_type=10,
|
|
data=struct.pack('>BBH', 131, 0, seq)
|
|
))
|
|
|
|
else:
|
|
print(f'ATBOOT type={boot_type} vers={boot_vers} contents={repr(data)}')
|
|
|
|
|
|
|
|
|
|
else:
|
|
print('unknown ddp payload', ddp_proto_type)
|