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lookup.go
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lookup.go
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package main
import (
"net"
"strings"
)
func lookupPrefix(input lookupPrefixInput) (output lookupPrefixOutput, err error) {
output.doc.CreateDate = input.doc.CreateDate
output.doc.SyncToken = input.doc.SyncToken
netIP := net.ParseIP(input.ip)
if netIP != nil {
if strings.Contains(netIP.String(), ":") {
for _, r := range input.doc.IPv6Prefixes {
if input.noAmazon && strings.ToLower(r.Service) == "amazon" {
continue
}
var netPrefix *net.IPNet
_, netPrefix, err = net.ParseCIDR(r.IPv6Prefix)
if netPrefix.Contains(netIP) {
output.doc.IPv6Prefixes = append(output.doc.IPv6Prefixes, r)
}
}
} else {
for _, r := range input.doc.Prefixes {
if input.noAmazon && strings.ToLower(r.Service) == "amazon" {
continue
}
var netPrefix *net.IPNet
_, netPrefix, err = net.ParseCIDR(r.IPPrefix)
if netPrefix.Contains(netIP) {
output.doc.Prefixes = append(output.doc.Prefixes, r)
}
}
}
}
return output, err
}
type lookupPrefixInput struct {
doc IPRangeDoc
ip string
noAmazon bool
}
type lookupPrefixOutput struct {
doc IPRangeDoc
}