Tools to work with the Google DNS over HTTPS API in R
https://cinc.rud.is/web/packages/gdns/
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50 lines
2.3 KiB
50 lines
2.3 KiB
S_GET <- purrr::safely(GET)
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#' Perform DNS over HTTPS queries using Google
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#'
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#' Traditional DNS queries and responses are sent over UDP or TCP without
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#' encryption. This is vulnerable to eavesdropping and spoofing (including
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#' DNS-based Internet filtering). Responses from recursive resolvers to clients
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#' are the most vulnerable to undesired or malicious changes, while
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#' communications between recursive resolvers and authoritative nameservers
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#' often incorporate additional protection.\cr
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#' \cr
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#' To address this problem, Google Public DNS offers DNS resolution over an
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#' encrypted HTTPS connection. DNS-over-HTTPS greatly enhances privacy and
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#' security between a client and a recursive resolver, and complements DNSSEC
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#' to provide end-to-end authenticated DNS lookups.
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#'
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#' @param name item to lookup. Valid characters are numbers, letters, hyphen, and dot. Length
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#' must be between 1 and 255. Names with escaped or non-ASCII characters
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#' are not supported. Internationalized domain names must use the
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#' punycode format (e.g. "\code{xn--qxam}" rather than "\code{ελ}")
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#' @param type RR type can be represented as a number in [1, 65535] or canonical
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#' string (A, aaaa, etc.)
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#' @param edns_client_subnet The edns0-client-subnet option. Format is an IP
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#' address with a subnet mask. Examples: \code{1.2.3.4/24},
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#' \code{2001:700:300::/48}.\cr
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#' If you are using DNS-over-HTTPS because of privacy concerns, and do
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#' not want any part of your IP address to be sent to authoritative
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#' nameservers for geographic location accuracy, use
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#' \code{edns_client_subnet=0.0.0.0/0}. Google Public DNS normally sends
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#' approximate network information (usually replacing the last part of
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#' your IPv4 address with zeroes).
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#' @return a \code{list} with the query result or \code{NULL} if an error occurred
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#' @export
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#' @examples
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#' query("rud.is")
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query <- function(name, type="1", cd=FALSE, edns_client_subnet=NULL) {
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res <- S_GET("https://dns.google.com/resolve",
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query=list(name=name,
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type=type,
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edns_client_subnet=edns_client_subnet))
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if (!is.null(res$result)) {
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stop_for_status(res$result)
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jsonlite::fromJSON(httr::content(res$result, as="text"))
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} else {
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NULL
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}
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}
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