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dynamically create client extensions offer from extensions list

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Signed-off-by: Andy Green <andy@warmcat.com>
This commit is contained in:
Andy Green 2011-03-06 13:15:29 +00:00
parent 57b4e9af2b
commit c6517fa2ad
3 changed files with 65 additions and 2 deletions
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46
lib/libwebsockets.c
View file

@ -555,6 +555,9 @@ libwebsocket_service_fd(struct libwebsocket_context *context,
int okay = 0;
struct lws_tokens eff_buf;
int more = 1;
int ext_count = 0;
struct libwebsocket_extension *ext;
#ifdef LWS_OPENSSL_SUPPORT
char ssl_err_buf[512];
#endif
@ -1119,8 +1122,47 @@ libwebsocket_service_fd(struct libwebsocket_context *context,
if (wsi->c_protocol)
p += sprintf(p, "Sec-WebSocket-Protocol: %s\x0d\x0a",
wsi->c_protocol);
p += sprintf(p, "Sec-WebSocket-Version: %d\x0d\x0a",
wsi->ietf_spec_revision);
/* tell the server what extensions we could support */
p += sprintf(p, "Sec-WebSocket-Extensions: ");
ext =context->extensions;
while (ext && ext->callback) {
n = 0;
n = context->protocols[0].callback(context, wsi,
LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED,
wsi->user_space, (char *)ext->name, 0);
/*
* zero return from callback means
* go ahead and allow the extension,
* it's what we get if the callback is
* unhandled
*/
if (n) {
ext++;
continue;
}
/* apply it */
if (ext_count)
*p++ = ',';
p += sprintf(p, ext->name);
ext_count++;
ext++;
}
p += sprintf(p, "\x0d\x0a");
if (wsi->ietf_spec_revision)
p += sprintf(p, "Sec-WebSocket-Version: %d\x0d\x0a",
wsi->ietf_spec_revision);
/* give userland a chance to append, eg, cookies */
context->protocols[0].callback(context, wsi,

10
lib/libwebsockets.h
View file

@ -64,6 +64,7 @@ enum libwebsocket_callback_reasons {
LWS_CALLBACK_OPENSSL_PERFORM_CLIENT_CERT_VERIFICATION,
LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER,
LWS_CALLBACK_CONFIRM_EXTENSION_OKAY,
LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED,
/* external poll() management support */
LWS_CALLBACK_ADD_POLL_FD,
LWS_CALLBACK_DEL_POLL_FD,
@ -334,6 +335,15 @@ struct libwebsocket_context;
* content during this callback might not be useful for anything.
* Notice this callback comes to protocols[0].
*
* LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED: When a client
* connection is being prepared to start a handshake to a server,
* each supported extension is checked with protocols[0] callback
* with this reason, giving the user code a chance to suppress the
* claim to support that extension by returning non-zero. If
* unhandled, by default 0 will be returned and the extension
* support included in the header to the server. Notice this
* callback comes to protocols[0].
*
* The next four reasons are optional and only need taking care of if you
* will be integrating libwebsockets sockets into an external polling
* array.

11
libwebsockets-api-doc.html
View file

@ -664,6 +664,17 @@ valid. Note though at this time the ESTABLISHED callback hasn't
happened yet so if you initialize <tt><b>user</b></tt> content there, <tt><b>user</b></tt>
content during this callback might not be useful for anything.
Notice this callback comes to protocols[0].
</blockquote>
<h3>LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED</h3>
<blockquote>
When a client
connection is being prepared to start a handshake to a server,
each supported extension is checked with protocols[0] callback
with this reason, giving the user code a chance to suppress the
claim to support that extension by returning non-zero. If
unhandled, by default 0 will be returned and the extension
support included in the header to the server. Notice this
callback comes to protocols[0].
<p>
The next four reasons are optional and only need taking care of if you
will be integrating libwebsockets sockets into an external polling