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<title data-rh="true">Session Signaling | cunīcu</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:url" content="https://cunicu.li/docs/development/signaling"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docusaurus_version" content="current"><meta data-rh="true" name="docusaurus_tag" content="docs-default-current"><meta data-rh="true" name="docsearch:version" content="current"><meta data-rh="true" name="docsearch:docusaurus_tag" content="docs-default-current"><meta data-rh="true" property="og:title" content="Session Signaling | cunīcu"><meta data-rh="true" name="description" content="Lets assume two peers $Pa$ & $Pb$ are seeking to establish a ICE session."><meta data-rh="true" property="og:description" content="Lets assume two peers $Pa$ & $Pb$ are seeking to establish a ICE session."><link data-rh="true" rel="icon" href="/img/favicon.png"><link data-rh="true" rel="canonical" href="https://cunicu.li/docs/development/signaling"><link data-rh="true" rel="alternate" href="https://cunicu.li/docs/development/signaling" hreflang="en"><link data-rh="true" rel="alternate" href="https://cunicu.li/docs/development/signaling" hreflang="x-default"><link rel="alternate" type="application/rss+xml" href="/blog/rss.xml" title="cunīcu RSS Feed">
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itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Session Signaling</span><meta itemprop="position" content="2"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h1>Session Signaling</h1><p>Lets assume two peers <span class="math math-inline"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><msub><mi>P</mi><mi>a</mi></msub></mrow><annotation encoding="application/x-tex">P_a</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8333em;vertical-align:-0.15em"></span><span class="mord"><span class="mord mathnormal" style="margin-right:0.13889em">P</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em"><span style="top:-2.55em;margin-left:-0.1389em;margin-right:0.05em"><span class="pstrut" style="height:2.7em"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">a</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em"><span></span></span></span></span></span></span></span></span></span></span> & <span class="math math-inline"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><msub><mi>P</mi><mi>b</mi></msub></mrow><annotation encoding="application/x-tex">P_b</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8333em;vertical-align:-0.15em"></span><span class="mord"><span class="mord mathnormal" style="margin-right:0.13889em">P</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.3361em"><span style="top:-2.55em;margin-left:-0.1389em;margin-right:0.05em"><span class="pstrut" style="height:2.7em"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">b</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em"><span></span></span></span></span></span></span></span></span></span></span> are seeking to establish a ICE session.</p><p>The smaller public key (PK) of the two peers takes the role of the controlling agent.
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In this example PA has the role of the controlling agent as: <span class="math math-inline"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>P</mi><mi>K</mi><mo stretchy="false">(</mo><msub><mi>P</mi><mi>a</mi></msub><mo stretchy="false">)</mo><mo><</mo><mi>P</mi><mi>K</mi><mo stretchy="false">(</mo><msub><mi>P</mi><mi>b</mi></msub><mo stretchy="false">)</mo></mrow><annotation encoding="application/x-tex">PK(P_a) < PK(P_b)</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em"></span><span class="mord mathnormal" style="margin-right:0.13889em">P</span><span class="mord mathnormal" style="margin-right:0.07153em">K</span><span class="mopen">(</span><span class="mord"><span class="mord mathnormal" style="margin-right:0.13889em">P</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em"><span style="top:-2.55em;margin-left:-0.1389em;margin-right:0.05em"><span class="pstrut" style="height:2.7em"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">a</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em"><span></span></span></span></span></span></span><span class="mclose">)</span><span class="mspace" style="margin-right:0.2778em"></span><span class="mrel"><</span><span class="mspace" style="margin-right:0.2778em"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em"></span><span class="mord mathnormal" style="margin-right:0.13889em">P</span><span class="mord mathnormal" style="margin-right:0.07153em">K</span><span class="mopen">(</span><span class="mord"><span class="mord mathnormal" style="margin-right:0.13889em">P</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.3361em"><span style="top:-2.55em;margin-left:-0.1389em;margin-right:0.05em"><span class="pstrut" style="height:2.7em"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">b</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em"><span></span></span></span></span></span></span><span class="mclose">)</span></span></span></span></span>.</p><div class="mermaid" data-mermaid-src="sequenceDiagram
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autonumber
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actor Pa as Peer A
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actor Pb as Peer B
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participant b as Backend
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Pa ->> b: SessionDescription(Pa -> Pb)
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b ->> Pb: SessionDescription(Pa -> Pb)
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Pb ->> b: SessionDescription(Pb -> Pa)
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b ->> Pa: SessionDescription(Pb -> Pa)">sequenceDiagram
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autonumber
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actor Pa as Peer A
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actor Pb as Peer B
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participant b as Backend
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Pa ->> b: SessionDescription(Pa -> Pb)
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b ->> Pb: SessionDescription(Pa -> Pb)
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Pb ->> b: SessionDescription(Pb -> Pa)
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b ->> Pa: SessionDescription(Pb -> Pa)</div><div class="mermaid" data-mermaid-src="stateDiagram-v2
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[*] --> Unknown
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note right of Unknown
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No agent exists
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end note
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Unknown --> Idle: 1. Create new agent<br>2. Send local credentials
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Idle --> New: On remote credentials<br>1. Start gathering local candidates
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Idle --> Idle: Repeatedly send local credentials with back-off
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New --> Connecting: On remote candidate<br>1. Connect
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Connecting --> Checking
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Checking --> Connected
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Checking --> Failed
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Completed --> Disconnected
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Connected --> Disconnected
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Connected --> Completed
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Completed --> Closed
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Disconnected --> Closed
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Closed --> Idle: 1. Create new agent<br>2. Send local credentials
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Failed --> Closed">stateDiagram-v2
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[*] --> Unknown
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note right of Unknown
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No agent exists
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end note
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Unknown --> Idle: 1. Create new agent<br>2. Send local credentials
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Idle --> New: On remote credentials<br>1. Start gathering local candidates
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Idle --> Idle: Repeatedly send local credentials with back-off
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New --> Connecting: On remote candidate<br>1. Connect
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Connecting --> Checking
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Checking --> Connected
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Checking --> Failed
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Completed --> Disconnected
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Connected --> Disconnected
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Connected --> Completed
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Completed --> Closed
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Disconnected --> Closed
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Closed --> Idle: 1. Create new agent<br>2. Send local credentials
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Failed --> Closed</div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="session-description">Session Description<a class="hash-link" href="#session-description" title="Direct link to heading"></a></h2><p>Session descriptions are exchanged by one or more the signaling backends via signaling <em>envelopes</em> which contain signaling <em>messages</em>.
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The <em>envelopes</em> are containers which encrypt the carried <em>message</em> via asymmetric cryptography using the public key of the recipient.</p><p>Both the <em>envelope</em> and the <em>message</em> are serialized using Protobuf.</p><p>Checkout the <a href="https://github.com/stv0g/cunicu/blob/master/proto/signaling.proto" target="_blank" rel="noopener noreferrer"><code>pkg/pb/signaling.proto</code></a> for details.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="backends">Backends<a class="hash-link" href="#backends" title="Direct link to heading"></a></h2><p>cunīcu can support multiple backends for signaling session information such as session IDs, ICE candidates, public keys and STUN credentials.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="available-backends">Available backends<a class="hash-link" href="#available-backends" title="Direct link to heading"></a></h3><ul><li>gRPC</li><li>Kubernetes API server</li></ul><p>For the use within a Kubernetes cluster also a dedicated backend using the Kubernetes api-server is available.
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Checkout the <a href="https://github.com/stv0g/cunicu/blob/master/pkg/signaling/backend.go" target="_blank" rel="noopener noreferrer"><code>Backend</code></a> interface for implementing your own backend.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="semantics">Semantics<a class="hash-link" href="#semantics" title="Direct link to heading"></a></h3><p>A backend must:</p><ul><li>Must facilitate a reliable delivery <em>envelopes</em> between peers using their public keys as addresses.</li><li>Must support delivery of <em>envelopes</em> to a group of recipients (e.g. multicast).</li><li>May deliver the <em>envelopes</em> out-of-order.</li><li>May discard <em>envelopes</em> if the recipient is not yet known or reachable.</li><li>Shall be stateless. It shall not buffer or record any <em>envelopes</em>.</li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="interface">Interface<a class="hash-link" href="#interface" title="Direct link to heading"></a></h3><p>All signaling backends implement the rather simple <a href="https://github.com/stv0g/cunicu/blob/master/pkg/signaling/backend.go" target="_blank" rel="noopener noreferrer"><code>signaling.Backend</code> interface</a>:</p><div class="language-go codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-go codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">type</span><span class="token plain"> Message </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> pb</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">SignalingMessage</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">type</span><span class="token plain"> MessageHandler </span><span class="token keyword" style="color:#00009f">interface</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token function" style="color:#d73a49">OnSignalingMessage</span><span class="token punctuation" style="color:#393A34">(</span><span class="token operator" style="color:#393A34">*</span><span class="token plain">crypto</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">PublicKeyPair</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">*</span><span class="token plain">Message</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">type</span><span class="token plain"> Backend </span><span class="token keyword" style="color:#00009f">interface</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> io</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">Closer</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// Publish a signaling message to a specific peer</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token function" style="color:#d73a49">Publish</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">ctx context</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">Context</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> kp </span><span class="token operator" style="color:#393A34">*</span><span class="token plain">crypto</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">KeyPair</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> msg </span><span class="token operator" style="color:#393A34">*</span><span class="token plain">Message</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token builtin">error</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// Subscribe to messages send by a specific peer</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token function" style="color:#d73a49">Subscribe</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">ctx context</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">Context</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> kp </span><span class="token operator" style="color:#393A34">*</span><span class="token plain">crypto</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">KeyPair</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> h MessageHandler</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token builtin">error</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// Subscribe to all messages irrespectively of sender</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token function" style="color:#d73a49">SubscribeAll</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">ctx context</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">Context</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> sk </span><span class="token operator" style="color:#393A34">*</span><span class="token plain">crypto</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">Key</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> h MessageHandler</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token builtin">error</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// Returns the backends type identifier</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token function" style="color:#d73a49">Type</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> pb</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">BackendType</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a 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