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libwebsockets/doc/html/group__smtp.html
Andy Green ed4acef481 RFC7233 HTTP Ranges support for server
This adds a serverside implementation of RFC7233 HTTP ranges.

 - LWS_WITH_RANGES is on by default at cmake

 - Accept-Ranges: bytes is added if LWS_WITH_RANGES is enabled

 - Both single ranges and multipart (2+) ranges are supported

Test with curl like this

Single

$ $ curl -s -r 64-95  http://localhost:7681/libwebsockets.org-logo.png  | hexdump -C
00000000  2e 01 fd 9d 12 27 00 00  00 19 74 45 58 74 53 6f  |.....'....tEXtSo|
00000010  66 74 77 61 72 65 00 77  77 77 2e 69 6e 6b 73 63  |ftware.www.inksc|

Multipart

$ curl -s -r 64-95,128-143  http://localhost:7681/libwebsockets.org-logo.png  | hexdump -C

00000000  5f 6c 77 73 0d 0a 43 6f  6e 74 65 6e 74 2d 54 79  |_lws..Content-Ty|
00000010  70 65 3a 20 69 6d 61 67  65 2f 70 6e 67 0d 0a 43  |pe: image/png..C|
00000020  6f 6e 74 65 6e 74 2d 52  61 6e 67 65 3a 20 62 79  |ontent-Range: by|
00000030  74 65 73 20 36 34 2d 39  35 2f 37 30 32 39 0d 0a  |tes 64-95/7029..|
00000040  0d 0a 2e 01 fd 9d 12 27  00 00 00 19 74 45 58 74  |.......'....tEXt|
00000050  53 6f 66 74 77 61 72 65  00 77 77 77 2e 69 6e 6b  |Software.www.ink|
00000060  73 63 5f 6c 77 73 0d 0a  43 6f 6e 74 65 6e 74 2d  |sc_lws..Content-|
00000070  54 79 70 65 3a 20 69 6d  61 67 65 2f 70 6e 67 0d  |Type: image/png.|
00000080  0a 43 6f 6e 74 65 6e 74  2d 52 61 6e 67 65 3a 20  |.Content-Range: |
00000090  62 79 74 65 73 20 31 32  38 2d 31 34 33 2f 37 30  |bytes 128-143/70|
000000a0  32 39 0d 0a 0d 0a 05 14  50 40 05 15 a5 c4 60 43  |29......P@....`C|
000000b0  91 c4 4a d4 c4 fc 5f 6c  77 73 0d 00              |..J..._lws..|

The corresponding header part is like this

	0x0030:            4854 5450 2f31 2e31 2032 3036      HTTP/1.1.206
	0x0040:  200d 0a73 6572 7665 723a 206c 7773 7773  ...server:.lwsws
	0x0050:  0d0a 636f 6e74 656e 742d 7479 7065 3a20  ..content-type:.
	0x0060:  6d75 6c74 6970 6172 742f 6279 7465 7261  multipart/bytera
	0x0070:  6e67 6573 0d0a 6163 6365 7074 2d72 616e  nges..accept-ran
	0x0080:  6765 733a 2062 7974 6573 0d0a 636f 6e74  ges:.bytes..cont
	0x0090:  656e 742d 6c65 6e67 7468 3a20 3138 380d  ent-length:.188.
	0x00a0:  0a63 6163 6865 2d63 6f6e 7472 6f6c 3a20  .cache-control:.
	0x00b0:  7072 6976 6174 6520 6d61 782d 6167 653a  private.max-age:
	0x00c0:  2036 300d 0a63 6f6e 6e65 6374 696f 6e3a  .60..connection:
	0x00d0:  206b 6565 702d 616c 6976 650d 0a65 7461  .keep-alive..eta
	0x00e0:  673a 2030 3030 3031 4237 3535 3444 3433  g:.00001B7554D43
	0x00f0:  3033 330d 0a0d 0a                        033....
2016-12-20 14:37:07 +08:00

278 lines
20 KiB
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<title>libwebsockets: Smtp</title>
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<div id="projectname">libwebsockets
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<div id="projectbrief">Lightweight C library for HTML5 websockets</div>
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<div class="header">
<div class="summary">
<a href="#nested-classes">Data Structures</a> &#124;
<a href="#enum-members">Enumerations</a> &#124;
<a href="#func-members">Functions</a> </div>
<div class="headertitle">
<div class="title">Smtp</div> </div>
</div><!--header-->
<div class="contents">
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="nested-classes"></a>
Data Structures</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structlws__email.html">lws_email</a></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="enum-members"></a>
Enumerations</h2></td></tr>
<tr class="memitem:ga116be79bf44f9dc2a97f46e051fe4dc0"><td class="memItemLeft" align="right" valign="top">enum &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__smtp.html#ga116be79bf44f9dc2a97f46e051fe4dc0">lwsgs_smtp_states</a> { <br />
&#160;&#160;<a class="el" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a29e5b0ecf75375b5a643faa3d6222b7c">LGSSMTP_IDLE</a>,
<a class="el" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0ab89442b7a3ca2b94c3cdcf33756eb933">LGSSMTP_CONNECTING</a>,
<a class="el" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0ab61778f70ecac007b334bb14942eb41d">LGSSMTP_CONNECTED</a>,
<a class="el" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a1dfec948a864205cec875f63cbe0d4ad">LGSSMTP_SENT_HELO</a>,
<br />
&#160;&#160;<a class="el" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a929bb4623ff3f585108aba2a1b047fab">LGSSMTP_SENT_FROM</a>,
<a class="el" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0aae20a0cb95b97a70f6b45d0ed2d5be83">LGSSMTP_SENT_TO</a>,
<a class="el" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a85e3c452950c09a79086bff4b9be5c14">LGSSMTP_SENT_DATA</a>,
<a class="el" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a38fba41f28d754e38079b31418a86a69">LGSSMTP_SENT_BODY</a>,
<br />
&#160;&#160;<a class="el" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a2c2ed16ffc572326e3040684084b21d5">LGSSMTP_SENT_QUIT</a>
<br />
}</td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:ga77fc9b56a1bb39484844981ec375fc29"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__smtp.html#ga77fc9b56a1bb39484844981ec375fc29">lws_email_init</a> (struct <a class="el" href="structlws__email.html">lws_email</a> *email, uv_loop_t *loop, int max_content)</td></tr>
<tr class="separator:ga77fc9b56a1bb39484844981ec375fc29"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga5e535e346d92a9daf00be33abf79d4eb"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__smtp.html#ga5e535e346d92a9daf00be33abf79d4eb">lws_email_check</a> (struct <a class="el" href="structlws__email.html">lws_email</a> *email)</td></tr>
<tr class="separator:ga5e535e346d92a9daf00be33abf79d4eb"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga25298a5afc1074e13b2d5711a86432b2"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__smtp.html#ga25298a5afc1074e13b2d5711a86432b2">lws_email_destroy</a> (struct <a class="el" href="structlws__email.html">lws_email</a> *email)</td></tr>
<tr class="separator:ga25298a5afc1074e13b2d5711a86432b2"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<h2>SMTP related functions</h2>
<p>These apis let you communicate with a local SMTP server to send email from lws. It handles all the SMTP sequencing and protocol actions.</p>
<p>Your system should have postfix, sendmail or another MTA listening on port 25 and able to send email using the "mail" commandline app. Usually distro MTAs are configured for this by default.</p>
<p>It runs via its own libuv events if initialized (which requires giving it a libuv loop to attach to).</p>
<p>It operates using three callbacks, on_next() queries if there is a new email to send, on_get_body() asks for the body of the email, and on_sent() is called after the email is successfully sent.</p>
<p>To use it</p>
<ul>
<li>create an <a class="el" href="structlws__email.html">lws_email</a> struct</li>
<li>initialize data, loop, the email_* strings, max_content_size and the callbacks</li>
<li>call <a class="el" href="group__smtp.html#ga77fc9b56a1bb39484844981ec375fc29">lws_email_init()</a></li>
</ul>
<p>When you have at least one email to send, call <a class="el" href="group__smtp.html#ga5e535e346d92a9daf00be33abf79d4eb">lws_email_check()</a> to schedule starting to send it. </p>
<h2 class="groupheader">Enumeration Type Documentation</h2>
<a id="ga116be79bf44f9dc2a97f46e051fe4dc0"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga116be79bf44f9dc2a97f46e051fe4dc0">&sect;&nbsp;</a></span>lwsgs_smtp_states</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
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<td class="memname">enum <a class="el" href="group__smtp.html#ga116be79bf44f9dc2a97f46e051fe4dc0">lwsgs_smtp_states</a></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>enum lwsgs_smtp_states - where we are in SMTP protocol sequence </p>
<table class="fieldtable">
<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="gga116be79bf44f9dc2a97f46e051fe4dc0a29e5b0ecf75375b5a643faa3d6222b7c"></a>LGSSMTP_IDLE&#160;</td><td class="fielddoc"><p>awaiting new email </p>
</td></tr>
<tr><td class="fieldname"><a id="gga116be79bf44f9dc2a97f46e051fe4dc0ab89442b7a3ca2b94c3cdcf33756eb933"></a>LGSSMTP_CONNECTING&#160;</td><td class="fielddoc"><p>opening tcp connection to MTA </p>
</td></tr>
<tr><td class="fieldname"><a id="gga116be79bf44f9dc2a97f46e051fe4dc0ab61778f70ecac007b334bb14942eb41d"></a>LGSSMTP_CONNECTED&#160;</td><td class="fielddoc"><p>tcp connection to MTA is connected </p>
</td></tr>
<tr><td class="fieldname"><a id="gga116be79bf44f9dc2a97f46e051fe4dc0a1dfec948a864205cec875f63cbe0d4ad"></a>LGSSMTP_SENT_HELO&#160;</td><td class="fielddoc"><p>sent the HELO </p>
</td></tr>
<tr><td class="fieldname"><a id="gga116be79bf44f9dc2a97f46e051fe4dc0a929bb4623ff3f585108aba2a1b047fab"></a>LGSSMTP_SENT_FROM&#160;</td><td class="fielddoc"><p>sent FROM </p>
</td></tr>
<tr><td class="fieldname"><a id="gga116be79bf44f9dc2a97f46e051fe4dc0aae20a0cb95b97a70f6b45d0ed2d5be83"></a>LGSSMTP_SENT_TO&#160;</td><td class="fielddoc"><p>sent TO </p>
</td></tr>
<tr><td class="fieldname"><a id="gga116be79bf44f9dc2a97f46e051fe4dc0a85e3c452950c09a79086bff4b9be5c14"></a>LGSSMTP_SENT_DATA&#160;</td><td class="fielddoc"><p>sent DATA request </p>
</td></tr>
<tr><td class="fieldname"><a id="gga116be79bf44f9dc2a97f46e051fe4dc0a38fba41f28d754e38079b31418a86a69"></a>LGSSMTP_SENT_BODY&#160;</td><td class="fielddoc"><p>sent the email body </p>
</td></tr>
<tr><td class="fieldname"><a id="gga116be79bf44f9dc2a97f46e051fe4dc0a2c2ed16ffc572326e3040684084b21d5"></a>LGSSMTP_SENT_QUIT&#160;</td><td class="fielddoc"><p>sent the session quit </p>
</td></tr>
</table>
<div class="fragment"><div class="line"><a name="l04146"></a><span class="lineno"> 4146</span>&#160; {</div><div class="line"><a name="l04147"></a><span class="lineno"> 4147</span>&#160; <a class="code" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a29e5b0ecf75375b5a643faa3d6222b7c">LGSSMTP_IDLE</a>, </div><div class="line"><a name="l04148"></a><span class="lineno"> 4148</span>&#160; <a class="code" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0ab89442b7a3ca2b94c3cdcf33756eb933">LGSSMTP_CONNECTING</a>, </div><div class="line"><a name="l04149"></a><span class="lineno"> 4149</span>&#160; <a class="code" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0ab61778f70ecac007b334bb14942eb41d">LGSSMTP_CONNECTED</a>, </div><div class="line"><a name="l04150"></a><span class="lineno"> 4150</span>&#160; <a class="code" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a1dfec948a864205cec875f63cbe0d4ad">LGSSMTP_SENT_HELO</a>, </div><div class="line"><a name="l04151"></a><span class="lineno"> 4151</span>&#160; <a class="code" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a929bb4623ff3f585108aba2a1b047fab">LGSSMTP_SENT_FROM</a>, </div><div class="line"><a name="l04152"></a><span class="lineno"> 4152</span>&#160; <a class="code" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0aae20a0cb95b97a70f6b45d0ed2d5be83">LGSSMTP_SENT_TO</a>, </div><div class="line"><a name="l04153"></a><span class="lineno"> 4153</span>&#160; <a class="code" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a85e3c452950c09a79086bff4b9be5c14">LGSSMTP_SENT_DATA</a>, </div><div class="line"><a name="l04154"></a><span class="lineno"> 4154</span>&#160; <a class="code" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a38fba41f28d754e38079b31418a86a69">LGSSMTP_SENT_BODY</a>, </div><div class="line"><a name="l04155"></a><span class="lineno"> 4155</span>&#160; <a class="code" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a2c2ed16ffc572326e3040684084b21d5">LGSSMTP_SENT_QUIT</a>, </div><div class="line"><a name="l04156"></a><span class="lineno"> 4156</span>&#160;};</div><div class="ttc" id="group__smtp_html_gga116be79bf44f9dc2a97f46e051fe4dc0ab61778f70ecac007b334bb14942eb41d"><div class="ttname"><a href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0ab61778f70ecac007b334bb14942eb41d">LGSSMTP_CONNECTED</a></div><div class="ttdef"><b>Definition:</b> libwebsockets.h:4149</div></div>
<div class="ttc" id="group__smtp_html_gga116be79bf44f9dc2a97f46e051fe4dc0a38fba41f28d754e38079b31418a86a69"><div class="ttname"><a href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a38fba41f28d754e38079b31418a86a69">LGSSMTP_SENT_BODY</a></div><div class="ttdef"><b>Definition:</b> libwebsockets.h:4154</div></div>
<div class="ttc" id="group__smtp_html_gga116be79bf44f9dc2a97f46e051fe4dc0a29e5b0ecf75375b5a643faa3d6222b7c"><div class="ttname"><a href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a29e5b0ecf75375b5a643faa3d6222b7c">LGSSMTP_IDLE</a></div><div class="ttdef"><b>Definition:</b> libwebsockets.h:4147</div></div>
<div class="ttc" id="group__smtp_html_gga116be79bf44f9dc2a97f46e051fe4dc0ab89442b7a3ca2b94c3cdcf33756eb933"><div class="ttname"><a href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0ab89442b7a3ca2b94c3cdcf33756eb933">LGSSMTP_CONNECTING</a></div><div class="ttdef"><b>Definition:</b> libwebsockets.h:4148</div></div>
<div class="ttc" id="group__smtp_html_gga116be79bf44f9dc2a97f46e051fe4dc0aae20a0cb95b97a70f6b45d0ed2d5be83"><div class="ttname"><a href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0aae20a0cb95b97a70f6b45d0ed2d5be83">LGSSMTP_SENT_TO</a></div><div class="ttdef"><b>Definition:</b> libwebsockets.h:4152</div></div>
<div class="ttc" id="group__smtp_html_gga116be79bf44f9dc2a97f46e051fe4dc0a929bb4623ff3f585108aba2a1b047fab"><div class="ttname"><a href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a929bb4623ff3f585108aba2a1b047fab">LGSSMTP_SENT_FROM</a></div><div class="ttdef"><b>Definition:</b> libwebsockets.h:4151</div></div>
<div class="ttc" id="group__smtp_html_gga116be79bf44f9dc2a97f46e051fe4dc0a2c2ed16ffc572326e3040684084b21d5"><div class="ttname"><a href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a2c2ed16ffc572326e3040684084b21d5">LGSSMTP_SENT_QUIT</a></div><div class="ttdef"><b>Definition:</b> libwebsockets.h:4155</div></div>
<div class="ttc" id="group__smtp_html_gga116be79bf44f9dc2a97f46e051fe4dc0a1dfec948a864205cec875f63cbe0d4ad"><div class="ttname"><a href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a1dfec948a864205cec875f63cbe0d4ad">LGSSMTP_SENT_HELO</a></div><div class="ttdef"><b>Definition:</b> libwebsockets.h:4150</div></div>
<div class="ttc" id="group__smtp_html_gga116be79bf44f9dc2a97f46e051fe4dc0a85e3c452950c09a79086bff4b9be5c14"><div class="ttname"><a href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a85e3c452950c09a79086bff4b9be5c14">LGSSMTP_SENT_DATA</a></div><div class="ttdef"><b>Definition:</b> libwebsockets.h:4153</div></div>
</div><!-- fragment -->
</div>
</div>
<h2 class="groupheader">Function Documentation</h2>
<a id="ga5e535e346d92a9daf00be33abf79d4eb"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga5e535e346d92a9daf00be33abf79d4eb">&sect;&nbsp;</a></span>lws_email_check()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">LWS_VISIBLE LWS_EXTERN void lws_email_check </td>
<td>(</td>
<td class="paramtype">struct <a class="el" href="structlws__email.html">lws_email</a> *&#160;</td>
<td class="paramname"><em>email</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__smtp.html#ga5e535e346d92a9daf00be33abf79d4eb">lws_email_check()</a> - Request check for new email</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">email</td><td>struct <a class="el" href="structlws__email.html">lws_email</a> context to check</td></tr>
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<p>Schedules a check for new emails in 1s... call this when you have queued an email for send. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#ga25298a5afc1074e13b2d5711a86432b2">&sect;&nbsp;</a></span>lws_email_destroy()</h2>
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<td class="memname">LWS_VISIBLE LWS_EXTERN void lws_email_destroy </td>
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<td class="paramtype">struct <a class="el" href="structlws__email.html">lws_email</a> *&#160;</td>
<td class="paramname"><em>email</em></td><td>)</td>
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<p><code>#include &lt;<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>&gt;</code></p>
<p><a class="el" href="group__smtp.html#ga25298a5afc1074e13b2d5711a86432b2">lws_email_destroy()</a> - stop using the struct <a class="el" href="structlws__email.html">lws_email</a></p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">email</td><td>the struct <a class="el" href="structlws__email.html">lws_email</a> context</td></tr>
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<p>Stop sending email using email and free allocations </p>
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<h2 class="memtitle"><span class="permalink"><a href="#ga77fc9b56a1bb39484844981ec375fc29">&sect;&nbsp;</a></span>lws_email_init()</h2>
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<td class="memname">LWS_VISIBLE LWS_EXTERN int lws_email_init </td>
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<td class="paramtype">struct <a class="el" href="structlws__email.html">lws_email</a> *&#160;</td>
<td class="paramname"><em>email</em>, </td>
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<td class="paramtype">uv_loop_t *&#160;</td>
<td class="paramname"><em>loop</em>, </td>
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<td class="paramtype">int&#160;</td>
<td class="paramname"><em>max_content</em>&#160;</td>
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<td>)</td>
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<p><code>#include &lt;<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>&gt;</code></p>
<p><a class="el" href="group__smtp.html#ga77fc9b56a1bb39484844981ec375fc29">lws_email_init()</a> - Initialize a struct <a class="el" href="structlws__email.html">lws_email</a></p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">email</td><td>struct <a class="el" href="structlws__email.html">lws_email</a> to init </td></tr>
<tr><td class="paramname">loop</td><td>libuv loop to use </td></tr>
<tr><td class="paramname">max_content</td><td>max email content size</td></tr>
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<p>Prepares a struct <a class="el" href="structlws__email.html">lws_email</a> for use ending SMTP </p>
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