This is an experimental implementation of Google's SPDY protocol version 2 and 3 in C.
This library provides SPDY framing layer implementation. It does not perform any I/O operations. When the library needs them, it calls the callback functions provided by the application. It also does not include any event polling mechanism, so the application can freely choose the way of handling events. This library code does not depend on any particular SSL library (except for example programs which depend on OpenSSL 1.0.1 or later).
Most of the SPDY/2 and SPDY/3 functionality has been implemented. In both versions, the direct support of server-push has not been available yet. The application can achieve server-push using primitive APIs though.
As described below, we can create SPDY client and server with the current Spdylay API.
The following packages are needed to build the library:
- pkg-config >= 0.20
To build and run the example programs, the following packages are needed:
- OpenSSL >= 1.0.1
Building from git is easy, but please be sure that at least autoconf 2.68 is used.:
$ autoreconf -i $ automake $ autoconf $ ./configure $ make
The public API reference is available on online. Visit http://spdylay.sourceforge.net/. All public APIs are in spdylay/spdylay.h. All public API functions as well as the callback function typedefs are documented.
examples directory contains SPDY client and server implementation using Spdylay. These programs are intended to make sure that Spdylay API is acutally usable for real implementation and also for debugging purposes. Please note that OpenSSL with NPN support is required in order to build and run these programs. At the time of this writing, the Beta 2 of OpenSSL 1.0.1 supports NPN.
SPDY client is called spdycat. It is a dead simple downloader like
wget/curl. It connects to SPDY server and gets resources given in the
command-line:
$ ./spdycat -vn https://www.google.com/
[ 0.029] NPN select next protocol: the remote server offers:
* spdy/2
* http/1.1
[ 0.040] recv SETTINGS frame <version=2, flags=0, length=12>
(niv=1)
[4(1):100]
[ 0.040] send SYN_STREAM frame <version=2, flags=1, length=107>
(stream_id=1, assoc_stream_id=0, pri=3)
host: www.google.com:443
method: GET
scheme: https
url: /
user-agent: spdylay/0.0.0
version: HTTP/1.1
[ 0.087] recv SYN_REPLY frame <version=2, flags=0, length=580>
(stream_id=1)
cache-control: private, max-age=0
content-type: text/html; charset=ISO-8859-1
date: Wed, 01 Feb 2012 15:43:00 GMT
expires: -1
server: gws
status: 200 OK
version: HTTP/1.1
x-frame-options: SAMEORIGIN
x-xss-protection: 1; mode=block
[ 0.087] recv DATA frame (stream_id=1, flags=0, length=4096)
[ 0.088] recv DATA frame (stream_id=1, flags=0, length=2617)
[ 0.094] recv DATA frame (stream_id=1, flags=0, length=4096)
[ 0.094] recv DATA frame (stream_id=1, flags=1, length=828)
[ 0.094] send GOAWAY frame <version=2, flags=0, length=4>
(last_good_stream_id=0)
spdycat can speak SPDY/3. Note that SPDY/3 is still moving target
and thus considered highly experimental. -3 option forces spdycat
to use SPDY/3 only:
$ ./spdycat -nv3 https://localhost:3000/
[ 0.000] NPN select next protocol: the remote server offers:
* spdy/2
* spdy/3
NPN selected the protocol: spdy/3
[ 0.002] send SYN_STREAM frame <version=3, flags=1, length=95>
(stream_id=1, assoc_stream_id=0, pri=3)
:host: localhost:3000
:method: GET
:path: /
:scheme: https
:version: HTTP/1.1
user-agent: spdylay/0.0.0
[ 0.003] recv SYN_REPLY frame <version=3, flags=0, length=95>
(stream_id=1)
:status: 404 Not Found
:version: HTTP/1.1
cache-control: max-age=3600
content-length: 144
date: Sun, 26 Feb 2012 09:16:51 GMT
server: spdyd spdylay/0.1.0
[ 0.003] recv DATA frame (stream_id=1, flags=0, length=144)
[ 0.003] recv DATA frame (stream_id=1, flags=1, length=0)
[ 0.003] send GOAWAY frame <version=3, flags=0, length=8>
(last_good_stream_id=0)
SPDY server is called spdyd. It is a non-blocking server and only
serves static contents. It can speak SPDY/2 and SPDY/3:
$ ./spdyd --htdocs=/your/htdocs/ -v 3000 server.key server.crt
The negotiated next protocol: spdy/2
[id=1] [ 1.633] recv SYN_STREAM frame <version=2, flags=1, length=99>
(stream_id=1, assoc_stream_id=0, pri=3)
host: localhost:3000
method: GET
scheme: https
url: /
user-agent: spdylay/0.0.0
version: HTTP/1.1
[id=1] [ 1.633] send SYN_REPLY frame <version=2, flags=0, length=126>
(stream_id=1)
cache-control: max-age=3600
content-length: 8472
date: Mon, 16 Jan 2012 12:46:27 GMT
last-modified: Mon, 16 Jan 2012 12:46:27 GMT
server: spdyd spdylay/0.1.0
status: 200 OK
version: HTTP/1.1
[id=1] [ 1.633] send DATA frame (stream_id=1, flags=0, length=4104)
[id=1] [ 1.633] send DATA frame (stream_id=1, flags=0, length=4104)
[id=1] [ 1.633] send DATA frame (stream_id=1, flags=0, length=288)
[id=1] [ 1.633] send DATA frame (stream_id=1, flags=1, length=8)
[id=1] [ 1.633] stream_id=1 closed
[id=1] [ 1.634] recv GOAWAY frame <version=2, flags=0, length=4>
(last_good_stream_id=0)
[id=1] [ 1.634] closed
Currently, spdyd needs epoll or kqueue.
There is another SPDY server called spdynative, which is
node.native style simple SPDY
server:
#include <iostream>
#include "spdy.h"
int main()
{
spdy server;
if(!server.listen("localhost", 8080, "server.key", "server.crt",
[](request& req, response& res) {
res.set_status(200);
res.set_header("content-type", "text/plain");
res.end("C++ FTW\n");
}))
return EXIT_FAILURE;
std::cout << "Server running at http://localhost:8080/" << std::endl;
return reactor::run(server);
}
Don't expect much from spdynative. It is just an example and does
not support asynchronous I/O at all.