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75 changes: 75 additions & 0 deletions
75
android/app/src/main/kotlin/com/network/proxy/vpn/util/TLS.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| package com.network.proxy.vpn.util | ||
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| import java.nio.ByteBuffer | ||
| import kotlin.math.min | ||
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| class TLS { | ||
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| companion object { | ||
| /** | ||
| * 从TLS Client Hello 解析域名 | ||
| */ | ||
| fun getDomain(buffer: ByteBuffer): String? { | ||
| var offset = buffer.position() | ||
| val limit = buffer.limit() | ||
| //TLS Client Hello | ||
| if (buffer[offset].toInt() != 0x16) return null | ||
| //Skip 43 byte header | ||
| offset += 43 | ||
| if (limit < (offset + 1)) return null | ||
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| //read session id | ||
| val sessionIDLength = buffer[offset++] | ||
| offset += sessionIDLength | ||
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| //read cipher suites | ||
| if (offset + 2 > limit) return null | ||
| val cipherSuitesLength = buffer.getShort(offset) | ||
| offset += 2 | ||
| offset += cipherSuitesLength | ||
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| //read Compression method. | ||
| if (offset + 1 > limit) return null | ||
| val compressionMethodLength = buffer[offset++].toInt() and 0xFF | ||
| offset += compressionMethodLength | ||
| if (offset > limit) return null | ||
|
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| //read Extensions | ||
| if (offset + 2 > limit) return null | ||
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| val extensionsLength = buffer.getShort(offset) | ||
| offset += 2 | ||
| if (offset + extensionsLength > limit) return null | ||
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| var end: Int = offset + extensionsLength | ||
| end = min(end, limit) | ||
| while (offset + 4 <= end) { | ||
| val extensionType = buffer.getShort(offset) | ||
| val extensionLength = buffer.getShort(offset + 2) | ||
| offset += 4 | ||
| //server_name | ||
| if (extensionType.toInt() == 0) { | ||
| if (offset + 5 > limit) return null | ||
| val serverNameListLength = buffer.getShort(offset) | ||
| offset += 2 | ||
| if (offset > limit) return null | ||
| if (offset + serverNameListLength > limit) return null | ||
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| val serverNameType = buffer[offset++] | ||
| val serverNameLength = buffer.getShort(offset) | ||
| offset += 2 | ||
| if (offset > limit || serverNameType.toInt() != 0) return null | ||
| if (offset + serverNameLength > limit) return null | ||
| val serverNameBytes = ByteArray(serverNameLength.toInt()) | ||
| buffer.get(serverNameBytes) | ||
| return String(serverNameBytes) | ||
| } else { | ||
| offset += extensionLength | ||
| } | ||
| } | ||
| return null | ||
| } | ||
| } | ||
|
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| } |
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