{"record":{"id":"a6769eaf8ae9df81","repo":"shadowsocks/shadowsocks-rust","slug":"invalid-fake-dns-ipv6-network","errorCode":null,"errorMessage":"invalid `fake_dns_ipv6_network`","messagePattern":"invalid `fake_dns_ipv6_network`","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/shadowsocks-service/src/config.rs","lineNumber":2068,"sourceCode":"                            if let Some(d) = local.fake_dns_record_expire_duration {\n                                local_config.fake_dns_record_expire_duration = Some(Duration::from_secs(d));\n                            }\n                            if let Some(n) = local.fake_dns_ipv4_network {\n                                match n.parse::<Ipv4Net>() {\n                                    Ok(n) => local_config.fake_dns_ipv4_network = Some(n),\n                                    Err(..) => {\n                                        let err =\n                                            Error::new(ErrorKind::Malformed, \"invalid `fake_dns_ipv4_network`\", None);\n                                        return Err(err);\n                                    }\n                                }\n                            }\n                            if let Some(n) = local.fake_dns_ipv6_network {\n                                match n.parse::<Ipv6Net>() {\n                                    Ok(n) => local_config.fake_dns_ipv6_network = Some(n),\n                                    Err(..) => {\n                                        let err =\n                                            Error::new(ErrorKind::Malformed, \"invalid `fake_dns_ipv6_network`\", None);\n                                        return Err(err);\n                                    }\n                                }\n                            }\n                            if let Some(p) = local.fake_dns_database_path {\n                                local_config.fake_dns_database_path = Some(p.into());\n                            }\n                        }\n\n                        let mut local_instance = LocalInstanceConfig {\n                            config: local_config,\n                            acl: None,\n                        };\n\n                        if let Some(acl_path) = local.acl {\n                            let acl = match AccessControl::load_from_file(&acl_path) {\n                                Ok(acl) => acl,\n                                Err(err) => {","sourceCodeStart":2050,"sourceCodeEnd":2086,"githubUrl":"https://github.com/shadowsocks/shadowsocks-rust/blob/8eb0f0a65b1d976ab6bed5787327ef86529b0435/crates/shadowsocks-service/src/config.rs#L2050-L2086","documentation":"Thrown while parsing a local (SIP008/JSON) config: `fake_dns_ipv6_network` could not be parsed as an Ipv6Net. Fake-DNS needs a valid IPv6 CIDR range; any other string is rejected with ErrorKind::Malformed.","triggerScenarios":"Config parsing with `fake_dns_ipv6_network` set to a non-IPv6-CIDR value: an IPv4 network, a bare IPv6 address without prefix, or malformed text.","commonSituations":"Configuring fake-dns IPv6 ranges by hand; using IPv4 ranges in the IPv6 field; typos in IPv6 addresses.","solutions":["Use a valid IPv6 CIDR, e.g. `\"fake_dns_ipv6_network\": \"fc00::/18\"`","Confirm the value contains colons and prefix is 0-128","Append a prefix length if only an address was given"],"exampleFix":"// before\n{\"fake_dns_ipv6_network\": \"fc00::\"}\n// after\n{\"fake_dns_ipv6_network\": \"fc00::/18\"}","handlingStrategy":"validation","validationCode":"fn valid_ipv6net(s: &str) -> bool { s.parse::<ipnet::Ipv6Net>().is_ok() }\n// before load: assert config[\"fake_dns_ipv6_network\"].as_str().map(valid_ipv6net).unwrap_or(true)","typeGuard":"fn is_ipv6net(s: &str) -> bool { s.parse::<ipnet::Ipv6Net>().is_ok() }","tryCatchPattern":"match Config::load_from_json(...) { Err(e) if format!(\"{e}\").contains(\"fake_dns_ipv6_network\") => fix_and_retry(), ... }","preventionTips":["Use ULA ranges like fc00::/18 for fake-dns IPv6","Do not put IPv4 values in the IPv6 field","Always include a prefix length"],"tags":["config","fake-dns","ipv6"],"backgroundTag":"invalid-config-value","analyzedSha":"8eb0f0a65b1d976ab6bed5787327ef86529b0435","analyzedAt":"2026-09-09T12:20:43.168Z","contentChangedAt":"2026-09-09T12:20:43.168Z","schemaVersion":2},"datasetVersion":"2026-09-14T16:17:12.679Z"}