Tools to work with the Google DNS over HTTPS API in R https://cinc.rud.is/web/packages/gdns/
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#' Vectorized query, returning only answers in a data frame
#'
#' @param entities character vector of entities to query
#' @param type RR type can be represented as a number in [1, 65535] or canonical
#' string (A, aaaa, etc). More information on RR types can be
#' found \href{http://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4}{here}.
#' @param edns_client_subnet The edns0-client-subnet option. Format is an IP
#' address with a subnet mask. Examples: \code{1.2.3.4/24},
#' \code{2001:700:300::/48}.\cr
#' If you are using DNS-over-HTTPS because of privacy concerns, and do
#' not want any part of your IP address to be sent to authoritative
#' nameservers for geographic location accuracy, use
#' \code{edns_client_subnet=0.0.0.0/0}. Google Public DNS normally sends
#' approximate network information (usually replacing the last part of
#' your IPv4 address with zeroes). \code{0.0.0.0/0} is the default.
#' @return \code{data.frame} of only answers (use \code{query()} for detailed responses)
#' @references \url{https://developers.google.com/speed/public-dns/docs/dns-over-https}
#' @export
#' @note this is a fairly naive function. It expects \code{Answer} to be one of the
#' return value list slots. The intent for it was to make it easier
#' to do bulk forward queries. It will get smarter in future versions.
#' @examples
#' hosts <- c("rud.is", "r-project.org", "rstudio.com", "apple.com")
#' gdns::bulk_query(hosts)
bulk_query <- function(entities, type = 1, edns_client_subnet = "0.0.0.0/0") {
lapply(
entities,
query, type = type, edns_client_subnet = edns_client_subnet
) -> results
lapply(seq_along(results), function(idx) {
if (length(results[[idx]]$Answer) == 0) {
data.frame(
entity = entities[idx],
name = NA_character_,
type = NA_character_,
TTL = NA_character_,
data = NA_character_,
stringsAsFactors = FALSE
)
} else {
results[[idx]]$Answer$entity <- entities[[idx]]
results[[idx]]$Answer
}
}) -> xlst
xdf <- do.call(rbind.data.frame, xlst)
class(xdf) <- c("tbl_df", "tbl", "data.frame")
xdf
}