def pop_frames(self):
# iterate over self.data and attempt to form HTTP/2 frames
idx = 0
frame_size = len(h2.H2Frame())
frames = []
while len(self.data) >= frame_size:
try:
frame_len = h2.H2Frame(self.data).len
except AssertionError: # when not enough data
break
except:
# can't decode as a frame? what are we looking at?
print("can't decode data into http/2 frame")
hexdump(self.data)
raise
# if we've got a frame, but don't have all the data for it yet
if frame_len > len(self.data):
break # without adding this frame
# if we pop this frame, remove its data from self.data
# and push self.seq up by len(frame)
frame, self.data = h2.H2Frame(
self.data[:frame_size + frame_len]), self.data[frame_size +
frame_len:]
self.seq += frame_size + frame_len
frames.append(frame)
return frames
def create_packet():
xpc_obj = XPC_Root(
XPC_Dictionary({
"MessageType": XPC_String("Heartbeat"),
"SequenceNumber": XPC_Uint64(78789),
}))
xpc_bytes = xpc_obj.to_bytes()
header = b'\x92\x0b\xb0)\x01\x01\x01\x00P\x00\x00\x00\x00\x00\x00\x00\x8bg\x02\x00\x00\x00\x00\x00'
payload = header + xpc_bytes
packet = h2.H2Frame(type=0, stream_id=1) / h2.H2DataFrame(data=payload)
hexdump(packet)
####
srv_max_frm_sz = 1 << 14
srv_hdr_tbl_sz = 4096
srv_max_hdr_tbl_sz = 0
srv_global_window = 1<<14
for setting in srv_set.payload.settings:
if setting.id == h2.H2Setting.SETTINGS_HEADER_TABLE_SIZE:
srv_hdr_tbl_sz = setting.value
elif setting.id == h2.H2Setting.SETTINGS_MAX_HEADER_LIST_SIZE:
srv_max_hdr_tbl_sz = setting.value
elif setting.id == h2.H2Setting.SETTINGS_INITIAL_WINDOW_SIZE:
srv_global_window = setting.value
####
import scapy.packet as packet
srv_global_window -=len(h2.H2_CLIENT_CONNECTION_PREFACE)
assert(srv_global_window >=0)
print ss.send(packet.Raw(h2.H2_CLIENT_CONNECTION_PREFACE))
####
set_ack = h2.H2Frame(flags={'A'}) / h2.H2SettingsFrame()
set_ack.show()