1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
from __future__ import absolute_import, division, print_function
import logging
import os
import stat
import struct
from enum import IntEnum
from .messages import BBPacketFS, BBPacketFSReturn
class RatpFSType(IntEnum):
invalid = 0
mount_call = 1
mount_return = 2
readdir_call = 3
readdir_return = 4
stat_call = 5
stat_return = 6
open_call = 7
open_return = 8
read_call = 9
read_return = 10
write_call = 11
write_return = 12
close_call = 13
close_return = 14
truncate_call = 15
truncate_return = 16
class RatpFSError(ValueError):
pass
class RatpFSPacket(object):
def __init__(self, type=RatpFSType.invalid, payload=b'', raw=None):
if payload is not None:
assert isinstance(payload, bytes)
if raw is not None:
type, = struct.unpack('!B', raw[:1])
self.type = RatpFSType(type)
self.payload = raw[1:]
else:
self.type = type
self.payload = payload
def __repr__(self):
s = "%s(" % self.__class__.__name__
s += "TYPE=%i," % self.type
s += "PAYLOAD=%s)" % repr(self.payload)
return s
def pack(self):
return struct.pack('!B', int(self.type))+self.payload
class RatpFSServer(object):
def __init__(self, path=None):
if path:
assert isinstance(path, bytes)
self.path = os.path.abspath(os.path.expanduser(path))
else:
self.path = path
self.next_handle = 1 # 0 is invalid
self.files = {}
self.mounted = False
logging.info("exporting: %s", self.path)
def _alloc_handle(self):
handle = self.next_handle
self.next_handle += 1
return handle
def _resolve(self, path):
assert isinstance(path, bytes)
components = path.split(b'/')
components = [x for x in components if x and x != '..']
return os.path.join(self.path, *components)
def handle_stat(self, path):
assert isinstance(path, bytes)
try:
logging.info("path: %r", path)
path = self._resolve(path)
logging.info("path1: %r", path)
s = os.stat(path)
except OSError as e:
return struct.pack('!BI', 0, e.errno)
if stat.S_ISREG(s.st_mode):
return struct.pack('!BI', 1, s.st_size)
elif stat.S_ISDIR(s.st_mode):
return struct.pack('!BI', 2, s.st_size)
else:
return struct.pack('!BI', 0, 0)
def handle_open(self, params):
flags, = struct.unpack('!I', params[:4])
flags = flags & (os.O_RDONLY | os.O_WRONLY | os.O_RDWR | os.O_CREAT |
os.O_TRUNC)
path = params[4:]
try:
f = os.open(self._resolve(path), flags, 0o666)
except OSError as e:
return struct.pack('!II', 0, e.errno)
h = self._alloc_handle()
self.files[h] = f
size = os.lseek(f, 0, os.SEEK_END)
return struct.pack('!II', h, size)
def handle_read(self, params):
h, pos, size = struct.unpack('!III', params)
f = self.files[h]
os.lseek(f, pos, os.SEEK_SET)
size = min(size, 4096)
return os.read(f, size)
def handle_write(self, params):
h, pos = struct.unpack('!II', params[:8])
payload = params[8:]
f = self.files[h]
pos = os.lseek(f, pos, os.SEEK_SET)
assert os.write(f, payload) == len(payload)
return b""
def handle_readdir(self, path):
assert isinstance(path, bytes)
res = b""
for x in os.listdir(self._resolve(path)):
res += x+b'\0'
return res
def handle_close(self, params):
h, = struct.unpack('!I', params[:4])
os.close(self.files.pop(h))
return b""
def handle_truncate(self, params):
h, size = struct.unpack('!II', params)
f = self.files[h]
os.ftruncate(f, size)
return b""
def handle(self, bbcall):
assert isinstance(bbcall, BBPacketFS)
logging.debug("bb-call: %s", bbcall)
fscall = RatpFSPacket(raw=bbcall.payload)
logging.info("fs-call: %s", fscall)
if not self.path:
logging.warning("no filesystem exported")
fsreturn = RatpFSPacket(type=RatpFSType.invalid)
elif fscall.type == RatpFSType.mount_call:
self.mounted = True
fsreturn = RatpFSPacket(type=RatpFSType.mount_return)
elif not self.mounted:
logging.warning("filesystem not mounted")
fsreturn = RatpFSPacket(type=RatpFSType.invalid)
elif fscall.type == RatpFSType.readdir_call:
payload = self.handle_readdir(fscall.payload)
fsreturn = RatpFSPacket(type=RatpFSType.readdir_return,
payload=payload)
elif fscall.type == RatpFSType.stat_call:
payload = self.handle_stat(fscall.payload)
fsreturn = RatpFSPacket(type=RatpFSType.stat_return,
payload=payload)
elif fscall.type == RatpFSType.open_call:
payload = self.handle_open(fscall.payload)
fsreturn = RatpFSPacket(type=RatpFSType.open_return,
payload=payload)
elif fscall.type == RatpFSType.read_call:
payload = self.handle_read(fscall.payload)
fsreturn = RatpFSPacket(type=RatpFSType.read_return,
payload=payload)
elif fscall.type == RatpFSType.write_call:
payload = self.handle_write(fscall.payload)
fsreturn = RatpFSPacket(type=RatpFSType.write_return,
payload=payload)
elif fscall.type == RatpFSType.close_call:
payload = self.handle_close(fscall.payload)
fsreturn = RatpFSPacket(type=RatpFSType.close_return,
payload=payload)
elif fscall.type == RatpFSType.truncate_call:
payload = self.handle_truncate(fscall.payload)
fsreturn = RatpFSPacket(type=RatpFSType.truncate_return,
payload=payload)
else:
raise RatpFSError()
logging.info("fs-return: %s", fsreturn)
bbreturn = BBPacketFSReturn(payload=fsreturn.pack())
logging.debug("bb-return: %s", bbreturn)
return bbreturn
|
