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libwebsockets/doc/html/group__client.html
Andy Green f32d25051c ws ping pong on idle connections 
This adds a new member to the context creation info struct "ws_ping_pong_interval".

If nonzero, it sets the number of seconds that established ws connections are
allowed to be idle before a PING is forced to be sent.  If zero (the default) then
tracking of idle connection is disabled for backwards compatibility.

Timeouts cover both the period between decision to send the ping and it being
sent (because it needs the socket to become writeable), and the period between
the ping being sent and the PONG coming back.

INFO debug logs are issues when the timeout stuff is operating.

You can test the server side by running the test server hacked to set ws_ping_pong_interval
and debug log mask of 15.  Both the mirror protocol and the server-status protocol are
idle if nothing is happening and will trigger the PING / PONG testing.  (You can also
test using lwsws and /etc/lwsws/conf with "ws-pingpong-secs": "20" in the global section)

For client, run the test client with -n -P 20 for 20s interval.  -n stops the test client
writing using the mirror protocol, so it will be idle and trigger the PING / PONGs.

The timeout interval may be up to +10s late, as lws checks for affected connections every
10s.
2016-08-10 21:20:23 +08:00

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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structlws__client__connect__info.html">lws_client_connect_info</a></td></tr>
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<tr class="memitem:ga96f3dbad54b2853969cfa933d66871ce"><td class="memItemLeft" align="right" valign="top">enum &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__client.html#ga96f3dbad54b2853969cfa933d66871ce">lws_client_connect_ssl_connection_flags</a> { <b>LCCSCF_USE_SSL</b> = (1 &lt;&lt; 0),
<b>LCCSCF_ALLOW_SELFSIGNED</b> = (1 &lt;&lt; 1),
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<tr class="memitem:ga0c966136905f467816307cfba6deb5fd"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN struct lws *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__client.html#ga0c966136905f467816307cfba6deb5fd">lws_client_connect_via_info</a> (struct <a class="el" href="structlws__client__connect__info.html">lws_client_connect_info</a> *ccinfo)</td></tr>
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<tr class="memitem:ga4af0a20108a95e8b6d94dd4d80055ff3"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN struct lws *LWS_WARN_UNUSED_RESULT&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__client.html#ga4af0a20108a95e8b6d94dd4d80055ff3">lws_client_connect</a> (struct lws_context *clients, const char *address, int port, int ssl_connection, const char *path, const char *host, const char *origin, const char *protocol, int ietf_version_or_minus_one) LWS_WARN_DEPRECATED</td></tr>
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<tr class="memitem:gac6a8558b4410961a880241c2ac1271e2"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN struct lws *LWS_WARN_UNUSED_RESULT&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__client.html#gac6a8558b4410961a880241c2ac1271e2">lws_client_connect_extended</a> (struct lws_context *clients, const char *address, int port, int ssl_connection, const char *path, const char *host, const char *origin, const char *protocol, int ietf_version_or_minus_one, void *userdata) LWS_WARN_DEPRECATED</td></tr>
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<tr class="memitem:ga4f44b8230e6732816ca5cd8d1aaaf340"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__client.html#ga4f44b8230e6732816ca5cd8d1aaaf340">lws_init_vhost_client_ssl</a> (const struct <a class="el" href="structlws__context__creation__info.html">lws_context_creation_info</a> *info, struct lws_vhost *vhost)</td></tr>
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LWS_VISIBLE LWS_EXTERN int&#160;</td><td class="memItemRight" valign="bottom"><b>lws_http_client_read</b> (struct lws *wsi, char **buf, int *len)</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<h2>Client releated functions</h2>
<h2 class="groupheader">Enumeration Type Documentation</h2>
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<td class="memname">enum <a class="el" href="group__client.html#ga96f3dbad54b2853969cfa933d66871ce">lws_client_connect_ssl_connection_flags</a></td>
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<p><code>#include &lt;<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>&gt;</code></p>
<p>enum lws_client_connect_ssl_connection_flags - flags that may be used with struct <a class="el" href="structlws__client__connect__info.html">lws_client_connect_info</a> ssl_connection member to control if and how SSL checks apply to the client connection being created </p>
<div class="fragment"><div class="line"><a name="l01871"></a><span class="lineno"> 1871</span>&#160; {</div><div class="line"><a name="l01872"></a><span class="lineno"> 1872</span>&#160; LCCSCF_USE_SSL = (1 &lt;&lt; 0),</div><div class="line"><a name="l01873"></a><span class="lineno"> 1873</span>&#160; LCCSCF_ALLOW_SELFSIGNED = (1 &lt;&lt; 1),</div><div class="line"><a name="l01874"></a><span class="lineno"> 1874</span>&#160; LCCSCF_SKIP_SERVER_CERT_HOSTNAME_CHECK = (1 &lt;&lt; 2)</div><div class="line"><a name="l01875"></a><span class="lineno"> 1875</span>&#160;};</div></div><!-- fragment -->
</div>
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<h2 class="groupheader">Function Documentation</h2>
<a class="anchor" id="ga4af0a20108a95e8b6d94dd4d80055ff3"></a>
<div class="memitem">
<div class="memproto">
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<td class="memname">LWS_VISIBLE LWS_EXTERN struct lws* LWS_WARN_UNUSED_RESULT lws_client_connect </td>
<td>(</td>
<td class="paramtype">struct lws_context *&#160;</td>
<td class="paramname"><em>clients</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *&#160;</td>
<td class="paramname"><em>address</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>port</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>ssl_connection</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *&#160;</td>
<td class="paramname"><em>path</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *&#160;</td>
<td class="paramname"><em>host</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *&#160;</td>
<td class="paramname"><em>origin</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *&#160;</td>
<td class="paramname"><em>protocol</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>ietf_version_or_minus_one</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p><code>#include &lt;<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>&gt;</code></p>
<p><a class="el" href="group__client.html#ga4af0a20108a95e8b6d94dd4d80055ff3">lws_client_connect()</a> - Connect to another websocket server </p><dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000002">Deprecated:</a></b></dt><dd>DEPRECATED use lws_client_connect_via_info </dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">clients</td><td>Websocket context </td></tr>
<tr><td class="paramname">address</td><td>Remote server address, eg, "myserver.com" </td></tr>
<tr><td class="paramname">port</td><td>Port to connect to on the remote server, eg, 80 </td></tr>
<tr><td class="paramname">ssl_connection</td><td>0 = ws://, 1 = wss:// encrypted, 2 = wss:// allow self signed certs </td></tr>
<tr><td class="paramname">path</td><td>Websocket path on server </td></tr>
<tr><td class="paramname">host</td><td>Hostname on server </td></tr>
<tr><td class="paramname">origin</td><td>Socket origin name </td></tr>
<tr><td class="paramname">protocol</td><td>Comma-separated list of protocols being asked for from the server, or just one. The server will pick the one it likes best. If you don't want to specify a protocol, which is legal, use NULL here. </td></tr>
<tr><td class="paramname">ietf_version_or_minus_one</td><td>-1 to ask to connect using the default, latest protocol supported, or the specific protocol ordinal</td></tr>
</table>
</dd>
</dl>
<p>This function creates a connection to a remote server </p>
</div>
</div>
<a class="anchor" id="gac6a8558b4410961a880241c2ac1271e2"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">LWS_VISIBLE LWS_EXTERN struct lws* LWS_WARN_UNUSED_RESULT lws_client_connect_extended </td>
<td>(</td>
<td class="paramtype">struct lws_context *&#160;</td>
<td class="paramname"><em>clients</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *&#160;</td>
<td class="paramname"><em>address</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>port</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>ssl_connection</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *&#160;</td>
<td class="paramname"><em>path</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *&#160;</td>
<td class="paramname"><em>host</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *&#160;</td>
<td class="paramname"><em>origin</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *&#160;</td>
<td class="paramname"><em>protocol</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>ietf_version_or_minus_one</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void *&#160;</td>
<td class="paramname"><em>userdata</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p><code>#include &lt;<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>&gt;</code></p>
<p><a class="el" href="group__client.html#gac6a8558b4410961a880241c2ac1271e2">lws_client_connect_extended()</a> - Connect to another websocket server </p><dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000003">Deprecated:</a></b></dt><dd>DEPRECATED use lws_client_connect_via_info </dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">clients</td><td>Websocket context </td></tr>
<tr><td class="paramname">address</td><td>Remote server address, eg, "myserver.com" </td></tr>
<tr><td class="paramname">port</td><td>Port to connect to on the remote server, eg, 80 </td></tr>
<tr><td class="paramname">ssl_connection</td><td>0 = ws://, 1 = wss:// encrypted, 2 = wss:// allow self signed certs </td></tr>
<tr><td class="paramname">path</td><td>Websocket path on server </td></tr>
<tr><td class="paramname">host</td><td>Hostname on server </td></tr>
<tr><td class="paramname">origin</td><td>Socket origin name </td></tr>
<tr><td class="paramname">protocol</td><td>Comma-separated list of protocols being asked for from the server, or just one. The server will pick the one it likes best. </td></tr>
<tr><td class="paramname">ietf_version_or_minus_one</td><td>-1 to ask to connect using the default, latest protocol supported, or the specific protocol ordinal </td></tr>
<tr><td class="paramname">userdata</td><td>Pre-allocated user data <pre class="fragment"> This function creates a connection to a remote server</pre> </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="ga0c966136905f467816307cfba6deb5fd"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">LWS_VISIBLE LWS_EXTERN struct lws* lws_client_connect_via_info </td>
<td>(</td>
<td class="paramtype">struct <a class="el" href="structlws__client__connect__info.html">lws_client_connect_info</a> *&#160;</td>
<td class="paramname"><em>ccinfo</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p><code>#include &lt;<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>&gt;</code></p>
<p><a class="el" href="group__client.html#ga0c966136905f467816307cfba6deb5fd">lws_client_connect_via_info()</a> - Connect to another websocket server </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ccinfo</td><td>pointer to <a class="el" href="structlws__client__connect__info.html">lws_client_connect_info</a> struct <pre class="fragment"> This function creates a connection to a remote server using the
information provided in ccinfo.</pre> </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="ga4f44b8230e6732816ca5cd8d1aaaf340"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">LWS_VISIBLE LWS_EXTERN int lws_init_vhost_client_ssl </td>
<td>(</td>
<td class="paramtype">const struct <a class="el" href="structlws__context__creation__info.html">lws_context_creation_info</a> *&#160;</td>
<td class="paramname"><em>info</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">struct lws_vhost *&#160;</td>
<td class="paramname"><em>vhost</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p><code>#include &lt;<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>&gt;</code></p>
<p><a class="el" href="group__client.html#ga4f44b8230e6732816ca5cd8d1aaaf340">lws_init_vhost_client_ssl()</a> - also enable client SSL on an existing vhost</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">info</td><td>client ssl related info </td></tr>
<tr><td class="paramname">vhost</td><td>which vhost to initialize client ssl operations on</td></tr>
</table>
</dd>
</dl>
<p>You only need to call this if you plan on using SSL client connections on the vhost. For non-SSL client connections, it's not necessary to call this.</p>
<p>The following members of info are used during the call </p><pre class="fragment"> - options must have LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT set,
otherwise the call does nothing
- provided_client_ssl_ctx must be NULL to get a generated client
ssl context, otherwise you can pass a prepared one in by setting it
- ssl_cipher_list may be NULL or set to the client valid cipher list
- ssl_ca_filepath may be NULL or client cert filepath
- ssl_cert_filepath may be NULL or client cert filepath
- ssl_private_key_filepath may be NULL or client cert private key
</pre><p>You must create your vhost explicitly if you want to use this, so you have a pointer to the vhost. Create the context first with the option flag LWS_SERVER_OPTION_EXPLICIT_VHOSTS and then call <a class="el" href="group__context-and-vhost.html#ga0c54c667ccd9b8b3dddcd123ca72f87c">lws_create_vhost()</a> with the same info struct. </p>
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