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Add support to detect upstream DNS resolver blocking

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This commit is contained in:
Patrick Pacher
2020-04-17 17:02:04 +02:00
parent bffe4a9eaf
commit 9deb1623d6
7 changed files with 194 additions and 85 deletions
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22
resolver/config.go
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@@ -29,28 +29,30 @@ var (
// We encourage everyone who has the technical abilities to set their own preferred servers.
// Default 1: Cloudflare
"dot://1.1.1.1:853?verify=cloudflare-dns.com", // Cloudflare
"dot://1.0.0.1:853?verify=cloudflare-dns.com", // Cloudflare
"dot://1.1.1.1:853?verify=cloudflare-dns.com&name=Cloudflare&blockedif=zeroip", // Cloudflare
"dot://1.0.0.1:853?verify=cloudflare-dns.com&name=Cloudflare&blockedif=zeroip", // Cloudflare
// Default 2: Quad9
"dot://9.9.9.9:853?verify=dns.quad9.net", // Quad9
"dot://149.112.112.112:853?verify=dns.quad9.net", // Quad9
"dot://9.9.9.9:853?verify=dns.quad9.net&name=Quad9&blockedif=empty", // Quad9
"dot://149.112.112.112:853?verify=dns.quad9.net&name=Quad9&blockedif=empty", // Quad9
// Fallback 1: Cloudflare
"dns://1.1.1.1:53", // Cloudflare
"dns://1.0.0.1:53", // Cloudflare
"dns://1.1.1.1:53?name=Cloudflare&blockedif=zeroip", // Cloudflare
"dns://1.0.0.1:53?name=Cloudflare&blockedif=zeroip", // Cloudflare
// Fallback 2: Quad9
"dns://9.9.9.9:53", // Quad9
"dns://149.112.112.112:53", // Quad9
"dns://9.9.9.9:53?name=Quad9&blockedif=empty", // Quad9
"dns://149.112.112.112:53?name=Quad9&blockedif=empty", // Quad9
// supported parameters
// - `verify=domain`: verify domain (dot only)
// future parameters:
//
// - `name=name`: human readable name for resolver
// - `blockedif=baredns`: how to detect if the dns service blocked something
// - `baredns`: NXDomain result, but without any other record in any section
// - `blockedif=empty`: how to detect if the dns service blocked something
// - `empty`: NXDomain result, but without any other record in any section
// - `refused`: Request was refused
// - `zeroip`: Answer only contains zeroip
}
CfgOptionNameServersKey = "dns/nameservers"