{"record":{"id":"42e2b94e8e291ade","repo":"shadow1ng/fscan","slug":"ipv6-address-invalid","errorCode":null,"errorMessage":"ipv6_address_invalid","messagePattern":"ipv6_address_invalid","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"plugins/local/socks5proxy.go","lineNumber":239,"sourceCode":"\tcase 0x03: // 域名\n\t\tlenBuf := make([]byte, 1)\n\t\tif _, err := io.ReadFull(clientConn, lenBuf); err != nil {\n\t\t\treturn nil, 0, fmt.Errorf(\"%s\", i18n.GetText(\"domain_format_invalid\"))\n\t\t}\n\t\tdomainLen := int(lenBuf[0])\n\t\tif domainLen == 0 {\n\t\t\treturn nil, 0, fmt.Errorf(\"%s\", i18n.GetText(\"domain_length_invalid\"))\n\t\t}\n\t\taddr := make([]byte, domainLen+2)\n\t\tif _, err := io.ReadFull(clientConn, addr); err != nil {\n\t\t\treturn nil, 0, fmt.Errorf(\"%s\", i18n.GetText(\"domain_length_invalid\"))\n\t\t}\n\t\ttargetHost = string(addr[:domainLen])\n\t\ttargetPort = int(addr[domainLen])<<8 + int(addr[domainLen+1])\n\tcase 0x04: // IPv6\n\t\taddr := make([]byte, 18)\n\t\tif _, err := io.ReadFull(clientConn, addr); err != nil {\n\t\t\treturn nil, 0, fmt.Errorf(\"%s\", i18n.GetText(\"ipv6_address_invalid\"))\n\t\t}\n\t\t// IPv6地址解析（简化实现）\n\t\ttargetHost = net.IP(addr[:16]).String()\n\t\ttargetPort = int(addr[16])<<8 + int(addr[17])\n\tdefault:\n\t\t// 发送不支持的地址类型响应\n\t\tresponse := []byte{0x05, 0x08, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}\n\t\t_, _ = clientConn.Write(response)\n\t\treturn nil, 0, fmt.Errorf(i18n.GetText(\"socks5_unsupported_address_type\")+\": %d\", addrType)\n\t}\n\tif targetPort == 0 {\n\t\treturn nil, 0, fmt.Errorf(\"%s\", i18n.GetText(\"socks5_invalid_request\"))\n\t}\n\n\t// 连接目标服务器\n\ttargetAddr := net.JoinHostPort(targetHost, strconv.Itoa(int(targetPort)))\n\ttargetConn, err := net.DialTimeout(\"tcp\", targetAddr, 10*time.Second)\n\tif err != nil {","sourceCodeStart":221,"sourceCodeEnd":257,"githubUrl":"https://github.com/shadow1ng/fscan/blob/95cc12e753bf43de7004e5aef42a9ffba3934303/plugins/local/socks5proxy.go#L221-L257","documentation":"Generic guard in the IPv6 (address type 0x04) branch: io.ReadFull failed while reading the 18-byte IPv6 address+port payload. It indicates a truncated or unreadable IPv6 address block (connection closed/timed out mid-read), not an invalid IPv6 textual format.","triggerScenarios":"Thrown at plugins/local/socks5proxy.go:239 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Ensure the client writes all 18 bytes (16 address + 2 port) for IPv6 targets","Check connection stability and read deadlines","Treat repeated occurrences as a broken or non-SOCKS5 client"],"exampleFix":null,"handlingStrategy":"validation","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"95cc12e753bf43de7004e5aef42a9ffba3934303","analyzedAt":"2026-09-06T17:07:30.094Z","contentChangedAt":"2026-09-06T17:07:30.094Z","schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}