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ngtcp2 project is an effort to implement IETF QUIC protocol

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ngtcp2

"Call it TCP/2. One More Time."

ngtcp2 project is an effort to implement QUIC protocol which is now being discussed in IETF QUICWG for its standardization.

Development status

Second Implementation Draft

We are focusing on implementing 5th Implementation Draft.

Requirements

The libngtcp2 C library itself does not depend on any external libraries. The example client, and server are written in C++14, and should compile with the modern C++ compilers (e.g., clang >= 4.0, or gcc >= 5.0).

The following packages are required to configure the build system:

  • pkg-config >= 0.20
  • autoconf
  • automake
  • autotools-dev
  • libtool

libngtcp2 uses cunit for its unit test frame work:

  • cunit >= 2.1

To build sources under the examples directory, libev is required:

  • libev

The client and server under examples directory require OpenSSL (master branch) as crypto backend:

Build from git

$ git clone --depth 1 https://github.com/openssl/openssl
$ cd openssl
$ # For Linux
$ ./config enable-tls1_3 --prefix=$PWD/build
$ make -j$(nproc)
$ make install_sw
$ cd ..
$ git clone https://github.com/ngtcp2/ngtcp2
$ cd ngtcp2
$ autoreconf -i
$ # For Mac users who have installed libev with MacPorts, append
$ # ',-L/opt/local/lib' to LDFLAGS, and also pass
$ # CPPFLAGS="-I/opt/local/include" to ./configure.
$ ./configure PKG_CONFIG_PATH=$PWD/../openssl/build/lib/pkgconfig LDFLAGS="-Wl,-rpath,$PWD/../openssl/build/lib"
$ make -j$(nproc) check

Client/Server

After successful build, the client and server executable should be found under examples directory.

examples/client has -i option to read data from stdin, and send them as STREAM data to server. examples/server parses stream data as HTTP/1.x request.

Both program have --tx-loss and --rx-loss to simulate packet loss.

$ examples/client 127.0.0.1 4433 -i
t=0.000359 TX Client Initial(0x02) CID=0x737b2c1ecd75d64b PKN=139454351 V=0xff000005
           STREAM(0xc1) F=0x00 SS=0x00 OO=0x00 D=0x01
           stream_id=0x00000000 fin=0 offset=0 data_length=274
           PADDING(0x00)
           length=949
t=0.002420 RX Server Cleartext(0x04) CID=0xfdeb3167833b8859 PKN=2044202911 V=0xff000005
           ACK(0xa8) N=0x00 LL=0x02 MM=0x00
           num_blks=0 num_ts=0 largest_ack=139454351 ack_delay=1708
           first_ack_block_length=0; [139454351..139454351]
           STREAM(0xc1) F=0x00 SS=0x00 OO=0x00 D=0x01
           stream_id=0x00000000 fin=0 offset=0 data_length=1203
           ; TransportParameter received in EncryptedExtensions
           ; supported_version[0]=0xff000005
           ; initial_max_stream_data=262144
           ; initial_max_data=1024
           ; initial_max_stream_id=199
           ; idle_timeout=30
           ; omit_connection_id=0
           ; max_packet_size=65527
           ; stateless_reset_token=8ed8f8a7f38d83318fc9aeac43baf2ae
t=0.002913 RX Server Cleartext(0x04) CID=0xfdeb3167833b8859 PKN=2044202912 V=0xff000005
           STREAM(0xc3) F=0x00 SS=0x00 OO=0x01 D=0x01
           stream_id=0x00000000 fin=0 offset=1203 data_length=302
           ; Negotiated cipher suite is TLS13-AES-128-GCM-SHA256
           ; Negotiated ALPN is hq-05
t=0.003159 QUIC handshake has completed
Interactive session started.  Hit Ctrl-D to end the session.
The stream 1 has opened.
t=0.003235 TX Client Cleartext(0x05) CID=0xfdeb3167833b8859 PKN=139454352 V=0xff000005
           ACK(0xa8) N=0x00 LL=0x02 MM=0x00
           num_blks=0 num_ts=0 largest_ack=2044202912 ack_delay=323
           first_ack_block_length=1; [2044202912..2044202911]
           STREAM(0xc3) F=0x00 SS=0x00 OO=0x01 D=0x01
           stream_id=0x00000000 fin=0 offset=274 data_length=58
t=0.028792 RX Short 01(0x01) CID=0xfdeb3167833b8859 PKN=2044202913
           ACK(0xa8) N=0x00 LL=0x02 MM=0x00
           num_blks=0 num_ts=0 largest_ack=139454352 ack_delay=25442
           first_ack_block_length=0; [139454352..139454352]
GET /helloworld
t=5.139039 TX Short 01(0x01) CID=0xfdeb3167833b8859 PKN=139454353
           STREAM(0xc1) F=0x00 SS=0x00 OO=0x00 D=0x01
           stream_id=0x00000001 fin=0 offset=0 data_length=16
t=5.140105 RX Short 01(0x01) CID=0xfdeb3167833b8859 PKN=2044202914
           STREAM(0xe1) F=0x01 SS=0x00 OO=0x00 D=0x01
           stream_id=0x00000001 fin=1 offset=0 data_length=177
           ordered STREAM data stream_id=0x00000001
00000000  3c 68 74 6d 6c 3e 3c 62  6f 64 79 3e 3c 68 31 3e  |<html><body><h1>|
00000010  49 74 20 77 6f 72 6b 73  21 3c 2f 68 31 3e 0a 3c  |It works!</h1>.<|
00000020  70 3e 54 68 69 73 20 69  73 20 74 68 65 20 64 65  |p>This is the de|
00000030  66 61 75 6c 74 20 77 65  62 20 70 61 67 65 20 66  |fault web page f|
00000040  6f 72 20 74 68 69 73 20  73 65 72 76 65 72 2e 3c  |or this server.<|
00000050  2f 70 3e 0a 3c 70 3e 54  68 65 20 77 65 62 20 73  |/p>.<p>The web s|
00000060  65 72 76 65 72 20 73 6f  66 74 77 61 72 65 20 69  |erver software i|
00000070  73 20 72 75 6e 6e 69 6e  67 20 62 75 74 20 6e 6f  |s running but no|
00000080  20 63 6f 6e 74 65 6e 74  20 68 61 73 20 62 65 65  | content has bee|
00000090  6e 20 61 64 64 65 64 2c  20 79 65 74 2e 3c 2f 70  |n added, yet.</p|
000000a0  3e 0a 3c 2f 62 6f 64 79  3e 3c 2f 68 74 6d 6c 3e  |>.</body></html>|
000000b0  0a                                                |.|
000000b1
t=5.165618 TX Short 01(0x01) CID=0xfdeb3167833b8859 PKN=139454354
           ACK(0xa8) N=0x00 LL=0x02 MM=0x00
           num_blks=0 num_ts=0 largest_ack=2044202914 ack_delay=25490
           first_ack_block_length=1; [2044202914..2044202913]
t=5.165781 RX Short 01(0x01) CID=0xfdeb3167833b8859 PKN=2044202915
           ACK(0xa8) N=0x00 LL=0x02 MM=0x00
           num_blks=0 num_ts=0 largest_ack=139454353 ack_delay=26023
           first_ack_block_length=0; [139454353..139454353]
t=5.166209 RX Short 01(0x01) CID=0xfdeb3167833b8859 PKN=2044202916
           RST_STREAM(0x01)
           stream_id=0x00000001 error_code=NO_ERROR(0x80000000) final_offset=177
t=5.166325 TX Short 01(0x01) CID=0xfdeb3167833b8859 PKN=139454355
           RST_STREAM(0x01)
           stream_id=0x00000001 error_code=QUIC_RECEIVED_RST(0x80000035) final_offset=16
t=5.191574 TX Short 01(0x01) CID=0xfdeb3167833b8859 PKN=139454356
           ACK(0xa8) N=0x00 LL=0x02 MM=0x00
           num_blks=0 num_ts=0 largest_ack=2044202916 ack_delay=25359
           first_ack_block_length=1; [2044202916..2044202915]
t=5.191928 RX Short 01(0x01) CID=0xfdeb3167833b8859 PKN=2044202917
           ACK(0xa8) N=0x00 LL=0x02 MM=0x00
           num_blks=0 num_ts=0 largest_ack=139454355 ack_delay=25257
           first_ack_block_length=1; [139454355..139454354]
t=35.220960 Timeout
t=35.221026 TX Short 01(0x01) CID=0xfdeb3167833b8859 PKN=139454357
           CONNECTION_CLOSE(0x02)
           error_code=NO_ERROR(0x80000000) reason_length=0

$ examples/server 127.0.0.1 4433 server.key server.crt
t=8.165451 RX Client Initial(0x02) CID=0x737b2c1ecd75d64b PKN=139454351 V=0xff000005
           STREAM(0xc1) F=0x00 SS=0x00 OO=0x00 D=0x01
           stream_id=0x00000000 fin=0 offset=0 data_length=274
           ; TransportParameter received in ClientHello
           ; negotiated_version=0xff000005
           ; initial_version=0xff000005
           ; initial_max_stream_data=262144
           ; initial_max_data=1024
           ; initial_max_stream_id=0
           ; idle_timeout=30
           ; omit_connection_id=0
           ; max_packet_size=65527
           PADDING(0x00)
           length=949
t=8.167158 TX Server Cleartext(0x04) CID=0xfdeb3167833b8859 PKN=2044202911 V=0xff000005
           ACK(0xa8) N=0x00 LL=0x02 MM=0x00
           num_blks=0 num_ts=0 largest_ack=139454351 ack_delay=1708
           first_ack_block_length=0; [139454351..139454351]
           STREAM(0xc1) F=0x00 SS=0x00 OO=0x00 D=0x01
           stream_id=0x00000000 fin=0 offset=0 data_length=1203
t=8.167202 TX Server Cleartext(0x04) CID=0xfdeb3167833b8859 PKN=2044202912 V=0xff000005
           STREAM(0xc3) F=0x00 SS=0x00 OO=0x01 D=0x01
           stream_id=0x00000000 fin=0 offset=1203 data_length=302
t=8.168142 RX Client Cleartext(0x05) CID=0xfdeb3167833b8859 PKN=139454352 V=0xff000005
           ACK(0xa8) N=0x00 LL=0x02 MM=0x00
           num_blks=0 num_ts=0 largest_ack=2044202912 ack_delay=323
           first_ack_block_length=1; [2044202912..2044202911]
           STREAM(0xc3) F=0x00 SS=0x00 OO=0x01 D=0x01
           stream_id=0x00000000 fin=0 offset=274 data_length=58
           ; Negotiated cipher suite is TLS13-AES-128-GCM-SHA256
           ; Negotiated ALPN is hq-05
t=8.168343 QUIC handshake has completed
t=8.193589 TX Short 01(0x01) CID=0xfdeb3167833b8859 PKN=2044202913
           ACK(0xa8) N=0x00 LL=0x02 MM=0x00
           num_blks=0 num_ts=0 largest_ack=139454352 ack_delay=25442
           first_ack_block_length=0; [139454352..139454352]
t=13.304143 RX Short 01(0x01) CID=0xfdeb3167833b8859 PKN=139454353
           STREAM(0xc1) F=0x00 SS=0x00 OO=0x00 D=0x01
           stream_id=0x00000001 fin=0 offset=0 data_length=16
           ordered STREAM data stream_id=0x00000001
00000000  47 45 54 20 2f 68 65 6c  6c 6f 77 6f 72 6c 64 0a  |GET /helloworld.|
00000010
t=13.304766 TX Short 01(0x01) CID=0xfdeb3167833b8859 PKN=2044202914
           STREAM(0xe1) F=0x01 SS=0x00 OO=0x00 D=0x01
           stream_id=0x00000001 fin=1 offset=0 data_length=177
t=13.330176 TX Short 01(0x01) CID=0xfdeb3167833b8859 PKN=2044202915
           ACK(0xa8) N=0x00 LL=0x02 MM=0x00
           num_blks=0 num_ts=0 largest_ack=139454353 ack_delay=26023
           first_ack_block_length=0; [139454353..139454353]
t=13.330642 RX Short 01(0x01) CID=0xfdeb3167833b8859 PKN=139454354
           ACK(0xa8) N=0x00 LL=0x02 MM=0x00
           num_blks=0 num_ts=0 largest_ack=2044202914 ack_delay=25490
           first_ack_block_length=1; [2044202914..2044202913]
t=13.330848 TX Short 01(0x01) CID=0xfdeb3167833b8859 PKN=2044202916
           RST_STREAM(0x01)
           stream_id=0x00000001 error_code=NO_ERROR(0x80000000) final_offset=177
t=13.331299 RX Short 01(0x01) CID=0xfdeb3167833b8859 PKN=139454355
           RST_STREAM(0x01)
           stream_id=0x00000001 error_code=QUIC_RECEIVED_RST(0x80000035) final_offset=16
t=13.356579 TX Short 01(0x01) CID=0xfdeb3167833b8859 PKN=2044202917
           ACK(0xa8) N=0x00 LL=0x02 MM=0x00
           num_blks=0 num_ts=0 largest_ack=139454355 ack_delay=25257
           first_ack_block_length=1; [139454355..139454354]
t=13.356769 RX Short 01(0x01) CID=0xfdeb3167833b8859 PKN=139454356
           ACK(0xa8) N=0x00 LL=0x02 MM=0x00
           num_blks=0 num_ts=0 largest_ack=2044202916 ack_delay=25359
           first_ack_block_length=1; [2044202916..2044202915]
t=43.386083 Timeout
t=43.386132 TX Short 01(0x01) CID=0xfdeb3167833b8859 PKN=2044202918
           CONNECTION_CLOSE(0x02)
           error_code=NO_ERROR(0x80000000) reason_length=0
t=43.386317 Closing QUIC connection

Resumption and 0-RTT

In order to resume a session, a session ticket, and a transport parameters must be fetched from server. First, run examples/client with --session-file, and --tp-file options which specify a path to session ticket, and transport parameter files respectively to save them locally.

Once these files are available, run examples/client with the same arguments again. You will see that session is resumed in your log if resumption succeeds. Resuming session makes server's first Handshake packet pretty small because it does not send its certificates.

To send 0-RTT data, after making sure that resumption works, use -d option to specify a file which contains data to send.

License

The MIT License

Copyright (c) 2016 ngtcp2 contributors

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