GabrieleRadice
192 lines
5.9 KiB
HTML
192 lines
5.9 KiB
HTML
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<!DOCTYPE html>
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<html id="htmlId">
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<head>
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<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
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<title>Coverage Report > InterfaceResolver</title>
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<style type="text/css">
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@import "../../css/coverage.css";
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@import "../../css/idea.min.css";
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</style>
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<script type="text/javascript" src="../../js/highlight.min.js"></script>
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<script type="text/javascript" src="../../js/highlightjs-line-numbers.min.js"></script>
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</head>
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<body>
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<div class="content">
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<div class="breadCrumbs">
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Current scope: <a href="../../index.html">all classes</a>
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<span class="separator">|</span>
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<a href="../index.html">it.polimi.ingsw.gc14.Network</a>
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</div>
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<h1>Coverage Summary for Class: InterfaceResolver (it.polimi.ingsw.gc14.Network)</h1>
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<table class="coverageStats">
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<tr>
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<th class="name">Class</th>
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<th class="coverageStat
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">
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Class, %
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</th>
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<th class="coverageStat
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">
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Method, %
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</th>
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<th class="coverageStat
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">
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Branch, %
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">
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Line, %
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</th>
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</tr>
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<tr>
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<td class="name">InterfaceResolver</td>
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<td class="coverageStat">
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<span class="percent">
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0%
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</span>
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<span class="absValue">
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(0/1)
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</span>
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</td>
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<td class="coverageStat">
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<span class="percent">
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0%
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</span>
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<span class="absValue">
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(0/3)
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</span>
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</td>
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<td class="coverageStat">
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<span class="percent">
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0%
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</span>
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<span class="absValue">
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(0/26)
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</span>
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</td>
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<td class="coverageStat">
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<span class="percent">
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0%
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</span>
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<span class="absValue">
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(0/22)
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</span>
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</td>
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</tr>
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</table>
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<br/>
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<br/>
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<pre>
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<code class="sourceCode" id="sourceCode"> package it.polimi.ingsw.gc14.Network;
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import java.net.*;
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import java.util.Enumeration;
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/** Utility class for resolving the local network interface to use when connecting to a server. */
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public class InterfaceResolver {
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private InterfaceResolver() {}
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/**
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* Returns the local IPv4 address that can reach the given server IP.
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*
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* <p>If the server is localhost, returns {@code "127.0.0.1"}.
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* Otherwise, iterates active non-loopback interfaces to find one on the same subnet;
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* falls back to a UDP connect trick if no matching subnet is found.
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*
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* @param serverIp the server IP address or hostname.
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* @return the local IP address string to use for outbound connections.
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* @throws Exception if no suitable interface can be determined.
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*/
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public static String resolveLocalInterface(String serverIp) throws Exception {
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<b class="nc"> if (serverIp.equalsIgnoreCase("localhost") || serverIp.startsWith("127.") || serverIp.isEmpty()) {</b>
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<b class="nc"> return "127.0.0.1";</b>
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}
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<b class="nc"> InetAddress serverAddr = InetAddress.getByName(serverIp);</b>
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<b class="nc"> Enumeration<NetworkInterface> ifaces = NetworkInterface.getNetworkInterfaces();</b>
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<b class="nc"> while (ifaces.hasMoreElements()) {</b>
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<b class="nc"> NetworkInterface ni = ifaces.nextElement();</b>
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<b class="nc"> if (!ni.isUp() || ni.isLoopback()) continue;</b>
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<b class="nc"> for (InterfaceAddress ia : ni.getInterfaceAddresses()) {</b>
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<b class="nc"> InetAddress localAddr = ia.getAddress();</b>
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<b class="nc"> if (!(localAddr instanceof Inet4Address)) continue;</b>
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<b class="nc"> int prefix = ia.getNetworkPrefixLength();</b>
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<b class="nc"> if (sameSubnet(localAddr, serverAddr, prefix)) {</b>
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<b class="nc"> return localAddr.getHostAddress();</b>
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}
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}
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}
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<b class="nc"> try (DatagramSocket socket = new DatagramSocket()) {</b>
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<b class="nc"> socket.connect(serverAddr, 9);</b>
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<b class="nc"> return socket.getLocalAddress().getHostAddress();</b>
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}
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}
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/**
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* Returns {@code true} if {@code a} and {@code b} share the same subnet given a CIDR {@code prefix} length.
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*
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* @param a first IPv4 address.
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* @param b second IPv4 address.
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* @param prefix CIDR prefix length (0–32).
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* @return {@code true} if both addresses belong to the same subnet.
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*/
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private static boolean sameSubnet(InetAddress a, InetAddress b, int prefix) {
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<b class="nc"> if (prefix < 0 || prefix > 32) return false;</b>
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<b class="nc"> int maskBits = prefix == 0 ? 0 : (0xFFFFFFFF << (32 - prefix));</b>
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<b class="nc"> int addrA = toInt(a.getAddress()) & maskBits;</b>
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<b class="nc"> int addrB = toInt(b.getAddress()) & maskBits;</b>
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<b class="nc"> return addrA == addrB;</b>
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}
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/**
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* Converts a 4-byte big-endian IPv4 address array to a signed 32-bit integer.
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*
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* @param bytes the 4-byte address array.
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* @return the corresponding signed integer.
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*/
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private static int toInt(byte[] bytes) {
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<b class="nc"> return ((bytes[0] & 0xFF) << 24) |</b>
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((bytes[1] & 0xFF) << 16) |
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((bytes[2] & 0xFF) << 8) |
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(bytes[3] & 0xFF);
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}
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}
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</code>
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</pre>
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</div>
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<div class="footer">
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<div style="float:right;">generated on 2026-06-19 22:53</div>
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