Refactored Backend
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parent
86f922a472
commit
73ea58378a
73
backend.go
73
backend.go
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@ -8,47 +8,54 @@ import (
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"strings"
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)
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// This function implements the PowerDNS-Pipe-Backend protocol and generates
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// the response data it possible
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func RunBackend(conn *connection.RedisConnection) {
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// handshake with PowerDNS
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fmt.Printf("OK\tDDNS Go Backend\n")
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bio := bufio.NewReader(os.Stdin)
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for {
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line, _, err := bio.ReadLine()
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HandleErr(err)
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parts := strings.Split(string(line), "\t")
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if len(parts) == 6 {
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query_name := parts[1]
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// get the host part of the fqdn
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// pi.d.example.org -> pi
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hostname := ""
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if strings.HasSuffix(query_name, DdnsDomain) {
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hostname = query_name[:len(query_name)-len(DdnsDomain)]
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}
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query_class := parts[2]
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// query_type := parts[3]
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query_id := parts[4]
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if hostname != "" {
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// check for existance and create response
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if conn.HostExist(hostname) {
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host := conn.GetHost(hostname)
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record := "A"
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if !host.IsIPv4() {
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record = "AAAA"
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}
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fmt.Printf("DATA\t%s\t%s\t%s\t10\t%s\t%s\n",
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query_name, query_class, record, query_id, host.Ip)
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}
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}
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}
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fmt.Printf("END\n")
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HandleRequest(string(line), conn)
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}
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}
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func HandleRequest(line string, conn *connection.RedisConnection) {
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defer fmt.Printf("END\n")
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parts := strings.Split(line, "\t")
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if len(parts) != 6 {
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return
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}
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query_name := parts[1]
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query_class := parts[2]
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// query_type := parts[3] // TODO Handle SOA Requests
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query_id := parts[4]
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// get the host part of the fqdn
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// pi.d.example.org -> pi
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hostname := ""
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if strings.HasSuffix(query_name, DdnsDomain) {
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hostname = query_name[:len(query_name)-len(DdnsDomain)]
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}
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if hostname == "" || ! conn.HostExist(hostname) {
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return
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}
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host := conn.GetHost(hostname)
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record := "A"
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if !host.IsIPv4() {
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record = "AAAA"
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}
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fmt.Printf("DATA\t%s\t%s\t%s\t10\t%s\t%s\n",
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query_name, query_class, record, query_id, host.Ip)
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}
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