Websockify не передає інформацію далі, з'єднання припиняється передчасно

1

Мені потрібно використовувати websockifyяк проксі. Кінцева установка буде:

  • веб-розетка на веб-сторінці підключається до websockifyсервера на тій же машині
  • websockify сервер ініціює з'єднання з програмою TCP-розетки, слухаючи десь інше (у цьому випадку та сама машина)
  • TCP-розетка отримує інформацію, виконує обчислення, відповідає websockify
  • websockify отримує відповідь і надсилає інформацію в розетку на веб-сторінці
  • відповідь подається у браузері користувача

Однак чомусь websockifyвідмовляється передавати інформацію далі і отримує повідомлення FIN раніше, ніж очікувалося. Websockify говорить "Непідтримується: Невідомий код коду 0x01".

Для розслідування цієї справи я створив MWE та перехопив трафік tcpdump.

Установка така:

  • По-перше, я запускаю netcat -v -v -l -p 40000- це програма, в яку ми хочемо отримати інформацію

  • Тоді я біжу websockify --verbose 50000 localhost:40000- ось команда, що наближається

  • Нарешті, я запускаю wscat -c localhost:50000- це додаток, який з'єднує веб-розетку з websockifyпроксі

Щойно я надсилаю щось із wscat, wscatз'єднання припиняється з кодом 1003. Цитуючи RFC 6455 :

1003 вказує, що кінцева точка припиняє з'єднання, оскільки вона отримала тип даних, який він не може прийняти (наприклад, кінцева точка, яка розуміє лише текстові дані, МОЖЕ надіслати це, якщо отримає двійкове повідомлення).

Ось візуальне подання цієї установки (повідомлення про помилку "відключено, тому що закрито 1003" написано саме так, оскільки я манально змінив джерело, щоб отримати більше інформації про відключення):

введіть тут опис зображення

Ось представлення даних Wireshark: введіть тут опис зображення

і ось пакети № 11,12,13 і 14, які привернули мою увагу:

Frame 11: 81 bytes on wire (648 bits), 81 bytes captured (648 bits)
    Encapsulation type: Ethernet (1)
    Arrival Time: Sep 19, 2017 20:35:46.491762000 CEST
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1505846146.491762000 seconds
    [Time delta from previous captured frame: 3.788711000 seconds]
    [Time delta from previous displayed frame: 3.788711000 seconds]
    [Time since reference or first frame: 3.887638000 seconds]
    Frame Number: 11
    Frame Length: 81 bytes (648 bits)
    Capture Length: 81 bytes (648 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ip:tcp:http:websocket:data-text-lines]
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00)
    Destination: 00:00:00_00:00:00 (00:00:00:00:00:00)
        Address: 00:00:00_00:00:00 (00:00:00:00:00:00)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Source: 00:00:00_00:00:00 (00:00:00:00:00:00)
        Address: 00:00:00_00:00:00 (00:00:00:00:00:00)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Type: IPv4 (0x0800)
Internet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1
    0100 .... = Version: 4
    .... 0101 = Header Length: 20 bytes (5)
    Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
        0000 00.. = Differentiated Services Codepoint: Default (0)
        .... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0)
    Total Length: 67
    Identification: 0x1581 (5505)
    Flags: 0x02 (Don't Fragment)
        0... .... = Reserved bit: Not set
        .1.. .... = Don't fragment: Set
        ..0. .... = More fragments: Not set
    Fragment offset: 0
    Time to live: 64
    Protocol: TCP (6)
    Header checksum: 0x2732 [validation disabled]
    [Header checksum status: Unverified]
    Source: 127.0.0.1
    Destination: 127.0.0.1
    [Source GeoIP: Unknown]
    [Destination GeoIP: Unknown]
TCP Src Port: 53832, Dst Port: 50000, Seq: 225, Ack: 130, Len: 15
    Src Port: 53832
    Dest Port: 50000
    [Stream index: 0]
    [TCP Segment Len: 15]
    Sequence number: 225    (relative sequence number)
    [Next sequence number: 240    (relative sequence number)]
    Acknowledgment number: 130    (relative ack number)
    1000 .... = Header Length: 32 bytes (8)
    Flags: 0x018 (PSH, ACK)
        000. .... .... = Reserved: Not set
        ...0 .... .... = Nonce: Not set
        .... 0... .... = Congestion Window Reduced (CWR): Not set
        .... .0.. .... = ECN-Echo: Not set
        .... ..0. .... = Urgent: Not set
        .... ...1 .... = Acknowledgment: Set
        .... .... 1... = Push: Set
        .... .... .0.. = Reset: Not set
        .... .... ..0. = Syn: Not set
        .... .... ...0 = Fin: Not set
        [TCP Flags: ·······AP···]
    Window size value: 350
    [Calculated window size: 44800]
    [Window size scaling factor: 128]
    Checksum: 0xfe37 [unverified]
    [Checksum Status: Unverified]
    Urgent pointer: 0
    Options: (12 bytes), No-Operation (NOP), No-Operation (NOP), Timestamps
        TCP Option - No-Operation (NOP)
            Kind: No-Operation (1)
        TCP Option - No-Operation (NOP)
            Kind: No-Operation (1)
        TCP Option - Timestamps: TSval 1764320477, TSecr 1764319312
            Kind: Time Stamp Option (8)
            Length: 10
            Timestamp value: 1764320477
            Timestamp echo reply: 1764319312
    [SEQ/ACK analysis]
        [iRTT: 0.000021000 seconds]
        [Bytes in flight: 15]
        [Bytes sent since last PSH flag: 15]
    TCP payload (15 bytes)
    [PDU Size: 15]
WebSocket
    1... .... = Fin: True
    .000 .... = Reserved: 0x0
    .... 0001 = Opcode: Text (1)
    1... .... = Mask: True
    .000 1001 = Payload length: 9
    Masking-Key: 2f0bda1c
    Masked payload
    Payload
Line-based text data
    alamakota

Frame 12: 102 bytes on wire (816 bits), 102 bytes captured (816 bits)
    Encapsulation type: Ethernet (1)
    Arrival Time: Sep 19, 2017 20:35:46.492378000 CEST
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1505846146.492378000 seconds
    [Time delta from previous captured frame: 0.000616000 seconds]
    [Time delta from previous displayed frame: 0.000616000 seconds]
    [Time since reference or first frame: 3.888254000 seconds]
    Frame Number: 12
    Frame Length: 102 bytes (816 bits)
    Capture Length: 102 bytes (816 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ip:tcp:http:websocket]
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00)
    Destination: 00:00:00_00:00:00 (00:00:00:00:00:00)
        Address: 00:00:00_00:00:00 (00:00:00:00:00:00)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Source: 00:00:00_00:00:00 (00:00:00:00:00:00)
        Address: 00:00:00_00:00:00 (00:00:00:00:00:00)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Type: IPv4 (0x0800)
Internet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1
    0100 .... = Version: 4
    .... 0101 = Header Length: 20 bytes (5)
    Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
        0000 00.. = Differentiated Services Codepoint: Default (0)
        .... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0)
    Total Length: 88
    Identification: 0xd42e (54318)
    Flags: 0x02 (Don't Fragment)
        0... .... = Reserved bit: Not set
        .1.. .... = Don't fragment: Set
        ..0. .... = More fragments: Not set
    Fragment offset: 0
    Time to live: 64
    Protocol: TCP (6)
    Header checksum: 0x686f [validation disabled]
    [Header checksum status: Unverified]
    Source: 127.0.0.1
    Destination: 127.0.0.1
    [Source GeoIP: Unknown]
    [Destination GeoIP: Unknown]
TCP Src Port: 50000, Dst Port: 53832, Seq: 130, Ack: 240, Len: 36
    Src Port: 50000
    Dest Port: 53832
    [Stream index: 0]
    [TCP Segment Len: 36]
    Sequence number: 130    (relative sequence number)
    [Next sequence number: 166    (relative sequence number)]
    Acknowledgment number: 240    (relative ack number)
    1000 .... = Header Length: 32 bytes (8)
    Flags: 0x018 (PSH, ACK)
        000. .... .... = Reserved: Not set
        ...0 .... .... = Nonce: Not set
        .... 0... .... = Congestion Window Reduced (CWR): Not set
        .... .0.. .... = ECN-Echo: Not set
        .... ..0. .... = Urgent: Not set
        .... ...1 .... = Acknowledgment: Set
        .... .... 1... = Push: Set
        .... .... .0.. = Reset: Not set
        .... .... ..0. = Syn: Not set
        .... .... ...0 = Fin: Not set
        [TCP Flags: ·······AP···]
    Window size value: 350
    [Calculated window size: 44800]
    [Window size scaling factor: 128]
    Checksum: 0xfe4c [unverified]
    [Checksum Status: Unverified]
    Urgent pointer: 0
    Options: (12 bytes), No-Operation (NOP), No-Operation (NOP), Timestamps
        TCP Option - No-Operation (NOP)
            Kind: No-Operation (1)
        TCP Option - No-Operation (NOP)
            Kind: No-Operation (1)
        TCP Option - Timestamps: TSval 1764320478, TSecr 1764320477
            Kind: Time Stamp Option (8)
            Length: 10
            Timestamp value: 1764320478
            Timestamp echo reply: 1764320477
    [SEQ/ACK analysis]
        [This is an ACK to the segment in frame: 11]
        [The RTT to ACK the segment was: 0.000616000 seconds]
        [iRTT: 0.000021000 seconds]
        [Bytes in flight: 36]
        [Bytes sent since last PSH flag: 36]
    TCP payload (36 bytes)
    [PDU Size: 36]
WebSocket
    1... .... = Fin: True
    .000 .... = Reserved: 0x0
    .... 1000 = Opcode: Connection Close (8)
    0... .... = Mask: False
    .010 0010 = Payload length: 34
    Payload
        Close
            Status code: Unsupported Data (1003)
            Reason: Unsupported: Unknown opcode 0x01

Frame 13: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
    Encapsulation type: Ethernet (1)
    Arrival Time: Sep 19, 2017 20:35:46.492394000 CEST
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1505846146.492394000 seconds
    [Time delta from previous captured frame: 0.000016000 seconds]
    [Time delta from previous displayed frame: 0.000016000 seconds]
    [Time since reference or first frame: 3.888270000 seconds]
    Frame Number: 13
    Frame Length: 66 bytes (528 bits)
    Capture Length: 66 bytes (528 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ip:tcp]
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00)
    Destination: 00:00:00_00:00:00 (00:00:00:00:00:00)
        Address: 00:00:00_00:00:00 (00:00:00:00:00:00)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Source: 00:00:00_00:00:00 (00:00:00:00:00:00)
        Address: 00:00:00_00:00:00 (00:00:00:00:00:00)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Type: IPv4 (0x0800)
Internet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1
    0100 .... = Version: 4
    .... 0101 = Header Length: 20 bytes (5)
    Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
        0000 00.. = Differentiated Services Codepoint: Default (0)
        .... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0)
    Total Length: 52
    Identification: 0x1582 (5506)
    Flags: 0x02 (Don't Fragment)
        0... .... = Reserved bit: Not set
        .1.. .... = Don't fragment: Set
        ..0. .... = More fragments: Not set
    Fragment offset: 0
    Time to live: 64
    Protocol: TCP (6)
    Header checksum: 0x2740 [validation disabled]
    [Header checksum status: Unverified]
    Source: 127.0.0.1
    Destination: 127.0.0.1
    [Source GeoIP: Unknown]
    [Destination GeoIP: Unknown]
TCP Src Port: 53832, Dst Port: 50000, Seq: 240, Ack: 166, Len: 0
    Src Port: 53832
    Dest Port: 50000
    [Stream index: 0]
    [TCP Segment Len: 0]
    Sequence number: 240    (relative sequence number)
    Acknowledgment number: 166    (relative ack number)
    1000 .... = Header Length: 32 bytes (8)
    Flags: 0x010 (ACK)
        000. .... .... = Reserved: Not set
        ...0 .... .... = Nonce: Not set
        .... 0... .... = Congestion Window Reduced (CWR): Not set
        .... .0.. .... = ECN-Echo: Not set
        .... ..0. .... = Urgent: Not set
        .... ...1 .... = Acknowledgment: Set
        .... .... 0... = Push: Not set
        .... .... .0.. = Reset: Not set
        .... .... ..0. = Syn: Not set
        .... .... ...0 = Fin: Not set
        [TCP Flags: ·······A····]
    Window size value: 350
    [Calculated window size: 44800]
    [Window size scaling factor: 128]
    Checksum: 0xfe28 [unverified]
    [Checksum Status: Unverified]
    Urgent pointer: 0
    Options: (12 bytes), No-Operation (NOP), No-Operation (NOP), Timestamps
        TCP Option - No-Operation (NOP)
            Kind: No-Operation (1)
        TCP Option - No-Operation (NOP)
            Kind: No-Operation (1)
        TCP Option - Timestamps: TSval 1764320478, TSecr 1764320478
            Kind: Time Stamp Option (8)
            Length: 10
            Timestamp value: 1764320478
            Timestamp echo reply: 1764320478
    [SEQ/ACK analysis]
        [This is an ACK to the segment in frame: 12]
        [The RTT to ACK the segment was: 0.000016000 seconds]
        [iRTT: 0.000021000 seconds]

Frame 14: 106 bytes on wire (848 bits), 106 bytes captured (848 bits)
    Encapsulation type: Ethernet (1)
    Arrival Time: Sep 19, 2017 20:35:46.494661000 CEST
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1505846146.494661000 seconds
    [Time delta from previous captured frame: 0.002267000 seconds]
    [Time delta from previous displayed frame: 0.002267000 seconds]
    [Time since reference or first frame: 3.890537000 seconds]
    Frame Number: 14
    Frame Length: 106 bytes (848 bits)
    Capture Length: 106 bytes (848 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ip:tcp:http:websocket]
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00)
    Destination: 00:00:00_00:00:00 (00:00:00:00:00:00)
        Address: 00:00:00_00:00:00 (00:00:00:00:00:00)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Source: 00:00:00_00:00:00 (00:00:00:00:00:00)
        Address: 00:00:00_00:00:00 (00:00:00:00:00:00)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Type: IPv4 (0x0800)
Internet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1
    0100 .... = Version: 4
    .... 0101 = Header Length: 20 bytes (5)
    Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
        0000 00.. = Differentiated Services Codepoint: Default (0)
        .... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0)
    Total Length: 92
    Identification: 0x1583 (5507)
    Flags: 0x02 (Don't Fragment)
        0... .... = Reserved bit: Not set
        .1.. .... = Don't fragment: Set
        ..0. .... = More fragments: Not set
    Fragment offset: 0
    Time to live: 64
    Protocol: TCP (6)
    Header checksum: 0x2717 [validation disabled]
    [Header checksum status: Unverified]
    Source: 127.0.0.1
    Destination: 127.0.0.1
    [Source GeoIP: Unknown]
    [Destination GeoIP: Unknown]
TCP Src Port: 53832, Dst Port: 50000, Seq: 240, Ack: 166, Len: 40
    Src Port: 53832
    Dest Port: 50000
    [Stream index: 0]
    [TCP Segment Len: 40]
    Sequence number: 240    (relative sequence number)
    [Next sequence number: 280    (relative sequence number)]
    Acknowledgment number: 166    (relative ack number)
    1000 .... = Header Length: 32 bytes (8)
    Flags: 0x018 (PSH, ACK)
        000. .... .... = Reserved: Not set
        ...0 .... .... = Nonce: Not set
        .... 0... .... = Congestion Window Reduced (CWR): Not set
        .... .0.. .... = ECN-Echo: Not set
        .... ..0. .... = Urgent: Not set
        .... ...1 .... = Acknowledgment: Set
        .... .... 1... = Push: Set
        .... .... .0.. = Reset: Not set
        .... .... ..0. = Syn: Not set
        .... .... ...0 = Fin: Not set
        [TCP Flags: ·······AP···]
    Window size value: 350
    [Calculated window size: 44800]
    [Window size scaling factor: 128]
    Checksum: 0xfe50 [unverified]
    [Checksum Status: Unverified]
    Urgent pointer: 0
    Options: (12 bytes), No-Operation (NOP), No-Operation (NOP), Timestamps
        TCP Option - No-Operation (NOP)
            Kind: No-Operation (1)
        TCP Option - No-Operation (NOP)
            Kind: No-Operation (1)
        TCP Option - Timestamps: TSval 1764320478, TSecr 1764320478
            Kind: Time Stamp Option (8)
            Length: 10
            Timestamp value: 1764320478
            Timestamp echo reply: 1764320478
    [SEQ/ACK analysis]
        [iRTT: 0.000021000 seconds]
        [Bytes in flight: 40]
        [Bytes sent since last PSH flag: 40]
    TCP payload (40 bytes)
    [PDU Size: 40]
WebSocket
    1... .... = Fin: True
    .000 .... = Reserved: 0x0
    .... 1000 = Opcode: Connection Close (8)
    1... .... = Mask: True
    .010 0010 = Payload length: 34
    Masking-Key: 3daec4d6
    Masked payload
    Payload
        Close
            Status code: Unsupported Data (1003)
            Reason: Unsupported: Unknown opcode 0x01

Схоже, wscatнадсилає код коду (0x1), який websockifyрозуміється як 0x01 і не вдається розпізнати, але я не знаю чому.

Як зробити так, щоб ця настройка працювала? Я намагався зв’язатися websockifyз різними програмами (реалізація веб-сокета в браузері, wscatальтернативи), але всі вони виходять з ладу.

websocket 
— мушка з пінопласту
джерело

Відповіді:

0

Я потрапив у те саме питання:

socket.send("hi"); // websockify chokes

... що було виправлено цим:

b = new Blob(["hi", "\n"], {type: 'text/plain'});
socket.send(b); // works as expected
— Елмо Тодуров
джерело
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