cmd_receive_blocking.py: refactor
This commit is contained in:
Brian Warner
parent
e6fba34570
commit
dbba482c62
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@ -1,195 +1,15 @@
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from __future__ import print_function
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import os, sys, json, binascii, six, tempfile, zipfile
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import io, os, sys, json, binascii, six, tempfile, zipfile
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from ..blocking.transcribe import Wormhole, WrongPasswordError
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from ..blocking.transit import TransitReceiver, TransitError
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from ..errors import handle_server_error
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from .progress import ProgressPrinter
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APPID = u"lothar.com/wormhole/text-or-file-xfer"
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def accept_file(args, them_d, w):
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from ..blocking.transit import TransitReceiver, TransitError
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file_data = them_d["file"]
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if args.output_file:
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filename = args.output_file
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else:
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# the basename() is intended to protect us against
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# "~/.ssh/authorized_keys" and other attacks
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filename = os.path.basename(file_data["filename"]) # unicode
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abs_filename = os.path.join(args.cwd, filename)
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filesize = file_data["filesize"]
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# get confirmation from the user before writing to the local directory
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if os.path.exists(abs_filename):
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print(u"Error: refusing to overwrite existing file %s" % (filename,),
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file=args.stdout)
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data = json.dumps({"error": "file already exists"}).encode("utf-8")
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w.send_data(data)
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return 1
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print(u"Receiving file (%d bytes) into: %s" % (filesize, filename),
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file=args.stdout)
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while True and not args.accept_file:
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ok = six.moves.input("ok? (y/n): ")
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if ok.lower().startswith("y"):
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break
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print(u"transfer rejected", file=sys.stderr)
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data = json.dumps({"error": "transfer rejected"}).encode("utf-8")
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w.send_data(data)
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return 1
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transit_receiver = TransitReceiver(args.transit_helper)
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data = json.dumps({
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"file_ack": "ok",
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"transit": {
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"direct_connection_hints": transit_receiver.get_direct_hints(),
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"relay_connection_hints": transit_receiver.get_relay_hints(),
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},
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}).encode("utf-8")
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w.send_data(data)
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# now done with the Wormhole object
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# now receive the rest of the owl
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tdata = them_d["transit"]
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transit_key = w.derive_key(APPID+u"/transit-key")
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transit_receiver.set_transit_key(transit_key)
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transit_receiver.add_their_direct_hints(tdata["direct_connection_hints"])
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transit_receiver.add_their_relay_hints(tdata["relay_connection_hints"])
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record_pipe = transit_receiver.connect()
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print(u"Receiving %d bytes for '%s' (%s).." %
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(filesize, filename, transit_receiver.describe()), file=args.stdout)
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tmp = abs_filename + ".tmp"
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with open(tmp, "wb") as f:
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received = 0
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p = ProgressPrinter(filesize, args.stdout)
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if not args.hide_progress:
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p.start()
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while received < filesize:
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try:
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plaintext = record_pipe.receive_record()
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except TransitError:
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print(u"", file=args.stdout)
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print(u"Connection dropped before full file received",
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file=args.stdout)
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print(u"got %d bytes, wanted %d" % (received, filesize),
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file=args.stdout)
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return 1
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f.write(plaintext)
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received += len(plaintext)
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if not args.hide_progress:
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p.update(received)
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if not args.hide_progress:
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p.finish()
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assert received == filesize
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os.rename(tmp, abs_filename)
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print(u"Received file written to %s" % filename, file=args.stdout)
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record_pipe.send_record(b"ok\n")
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record_pipe.close()
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return 0
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def accept_directory(args, them_d, w):
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from ..blocking.transit import TransitReceiver, TransitError
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file_data = them_d["directory"]
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mode = file_data["mode"]
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if mode != "zipfile/deflated":
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print(u"Error: unknown directory-transfer mode '%s'" % (mode,),
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file=args.stdout)
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data = json.dumps({"error": "unknown mode"}).encode("utf-8")
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w.send_data(data)
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return 1
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if args.output_file:
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dirname = args.output_file
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else:
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# the basename() is intended to protect us against
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# "~/.ssh/authorized_keys" and other attacks
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dirname = os.path.basename(file_data["dirname"]) # unicode
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abs_dirname = os.path.join(args.cwd, dirname)
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filesize = file_data["zipsize"]
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num_files = file_data["numfiles"]
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num_bytes = file_data["numbytes"]
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if os.path.exists(abs_dirname):
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print(u"Error: refusing to overwrite existing directory %s" %
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(dirname,), file=args.stdout)
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data = json.dumps({"error": "directory already exists"}).encode("utf-8")
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w.send_data(data)
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return 1
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print(u"Receiving directory into: %s/" % (dirname,), file=args.stdout)
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print(u"%d files, %d bytes (%d compressed)" %
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(num_files, num_bytes, filesize), file=args.stdout)
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while True and not args.accept_file:
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ok = six.moves.input("ok? (y/n): ")
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if ok.lower().startswith("y"):
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break
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print(u"transfer rejected", file=sys.stderr)
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data = json.dumps({"error": "transfer rejected"}).encode("utf-8")
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w.send_data(data)
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return 1
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transit_receiver = TransitReceiver(args.transit_helper)
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data = json.dumps({
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"file_ack": "ok",
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"transit": {
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"direct_connection_hints": transit_receiver.get_direct_hints(),
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"relay_connection_hints": transit_receiver.get_relay_hints(),
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},
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}).encode("utf-8")
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w.send_data(data)
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# now done with the Wormhole object
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# now receive the rest of the owl
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tdata = them_d["transit"]
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transit_key = w.derive_key(APPID+u"/transit-key")
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transit_receiver.set_transit_key(transit_key)
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transit_receiver.add_their_direct_hints(tdata["direct_connection_hints"])
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transit_receiver.add_their_relay_hints(tdata["relay_connection_hints"])
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record_pipe = transit_receiver.connect()
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print(u"Receiving %d bytes for '%s' (%s).." %
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(filesize, dirname, transit_receiver.describe()), file=args.stdout)
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f = tempfile.SpooledTemporaryFile()
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received = 0
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p = ProgressPrinter(filesize, args.stdout)
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if not args.hide_progress:
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p.start()
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while received < filesize:
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try:
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plaintext = record_pipe.receive_record()
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except TransitError:
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print(u"", file=args.stdout)
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print(u"Connection dropped before full file received",
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file=args.stdout)
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print(u"got %d bytes, wanted %d" % (received, filesize),
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file=args.stdout)
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return 1
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f.write(plaintext)
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received += len(plaintext)
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if not args.hide_progress:
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p.update(received)
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if not args.hide_progress:
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p.finish()
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assert received == filesize
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print(u"Unpacking zipfile..", file=args.stdout)
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with zipfile.ZipFile(f, "r", zipfile.ZIP_DEFLATED) as zf:
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zf.extractall(path=abs_dirname)
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# extractall() appears to offer some protection against malicious
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# pathnames. For example, "/tmp/oops" and "../tmp/oops" both do the
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# same thing as the (safe) "tmp/oops".
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print(u"Received files written to %s/" % dirname, file=args.stdout)
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record_pipe.send_record(b"ok\n")
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record_pipe.close()
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return 0
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@handle_server_error
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def receive_blocking(args):
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# we're receiving text, or a file
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from ..blocking.transcribe import Wormhole, WrongPasswordError
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assert isinstance(args.relay_url, type(u""))
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with Wormhole(APPID, args.relay_url) as w:
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@ -198,11 +18,12 @@ def receive_blocking(args):
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args.code = u"0-"
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code = args.code
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if not code:
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code = w.input_code("Enter receive wormhole code: ", args.code_length)
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code = w.input_code("Enter receive wormhole code: ",
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args.code_length)
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w.set_code(code)
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verifier = binascii.hexlify(w.get_verifier()).decode("ascii")
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if args.verify:
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verifier = binascii.hexlify(w.get_verifier()).decode("ascii")
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print(u"Verifier %s." % verifier, file=args.stdout)
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try:
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@ -227,13 +48,124 @@ def receive_blocking(args):
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return 1
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if "file" in them_d:
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return accept_file(args, them_d, w)
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mode = "file"
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file_data = them_d["file"]
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# the basename() is intended to protect us against
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# "~/.ssh/authorized_keys" and other attacks
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destname = os.path.basename(file_data["filename"]) # unicode
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xfersize = file_data["filesize"]
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elif "directory" in them_d:
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mode = "directory"
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file_data = them_d["directory"]
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zipmode = file_data["mode"]
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if zipmode != "zipfile/deflated":
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print(u"Error: unknown directory-transfer mode '%s'" %
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(zipmode,), file=args.stdout)
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data = json.dumps({"error": "unknown mode"}).encode("utf-8")
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w.send_data(data)
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return 1
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destname = os.path.basename(file_data["dirname"]) # unicode
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xfersize = file_data["zipsize"]
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num_files = file_data["numfiles"]
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num_bytes = file_data["numbytes"]
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else:
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print(u"I don't know what they're offering\n", file=args.stdout)
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print(u"Offer details:", them_d, file=args.stdout)
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data = json.dumps({"error": "unknown offer type"}).encode("utf-8")
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w.send_data(data)
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return 1
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if "directory" in them_d:
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return accept_directory(args, them_d, w)
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if args.output_file:
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destname = args.output_file # override
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abs_destname = os.path.join(args.cwd, destname)
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print(u"I don't know what they're offering\n", file=args.stdout)
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print(u"Offer details:", them_d, file=args.stdout)
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data = json.dumps({"error": "unknown offer type"}).encode("utf-8")
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# get confirmation from the user before writing to the local directory
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if os.path.exists(abs_destname):
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print(u"Error: refusing to overwrite existing %s %s" %
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(mode, destname), file=args.stdout)
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data = json.dumps({"error": "%s already exists" % mode}).encode("utf-8")
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w.send_data(data)
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return 1
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# TODO: add / to destname
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print(u"Receiving %s (%d bytes) into: %s" % (mode, xfersize, destname),
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file=args.stdout)
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if mode == "directory":
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print(u"%d files, %d bytes (uncompressed)" %
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(num_files, num_bytes), file=args.stdout)
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while True and not args.accept_file:
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ok = six.moves.input("ok? (y/n): ")
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if ok.lower().startswith("y"):
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break
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print(u"transfer rejected", file=sys.stderr)
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data = json.dumps({"error": "transfer rejected"}).encode("utf-8")
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w.send_data(data)
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return 1
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transit_receiver = TransitReceiver(args.transit_helper)
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data = json.dumps({
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"file_ack": "ok",
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"transit": {
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"direct_connection_hints": transit_receiver.get_direct_hints(),
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"relay_connection_hints": transit_receiver.get_relay_hints(),
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},
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}).encode("utf-8")
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w.send_data(data)
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return 1
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# now done with the Wormhole object
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# now receive the rest of the owl
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tdata = them_d["transit"]
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transit_key = w.derive_key(APPID+u"/transit-key")
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transit_receiver.set_transit_key(transit_key)
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transit_receiver.add_their_direct_hints(tdata["direct_connection_hints"])
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transit_receiver.add_their_relay_hints(tdata["relay_connection_hints"])
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record_pipe = transit_receiver.connect()
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print(u"Receiving %d bytes for '%s' (%s).." %
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(xfersize, destname, transit_receiver.describe()),
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file=args.stdout)
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if mode == "file":
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tmp_destname = abs_destname + ".tmp"
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f = open(tmp_destname, "wb")
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else:
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f = tempfile.SpooledTemporaryFile()
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progress_stdout = args.stdout
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if args.hide_progress:
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progress_stdout = io.StringIO()
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received = 0
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p = ProgressPrinter(xfersize, progress_stdout)
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p.start()
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while received < xfersize:
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try:
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plaintext = record_pipe.receive_record()
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except TransitError:
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print(u"", file=args.stdout)
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print(u"Connection dropped before full file received",
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file=args.stdout)
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print(u"got %d bytes, wanted %d" % (received, xfersize),
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file=args.stdout)
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return 1
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f.write(plaintext)
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received += len(plaintext)
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p.update(received)
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p.finish()
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assert received == xfersize
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if mode == "file":
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os.rename(tmp_destname, abs_destname)
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print(u"Received file written to %s" % destname, file=args.stdout)
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else:
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print(u"Unpacking zipfile..", file=args.stdout)
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with zipfile.ZipFile(f, "r", zipfile.ZIP_DEFLATED) as zf:
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zf.extractall(path=abs_destname)
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# extractall() appears to offer some protection against
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# malicious pathnames. For example, "/tmp/oops" and
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# "../tmp/oops" both do the same thing as the (safe)
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# "tmp/oops".
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print(u"Received files written to %s/" % destname, file=args.stdout)
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record_pipe.send_record(b"ok\n")
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record_pipe.close()
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return 0
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