Michael Bridgen
0615d122e9
The Zone DB tells you if you have a duplicate or missing record, but the HTTP server smoothes these over.
96 lines
3.0 KiB
Go
96 lines
3.0 KiB
Go
package weavedns
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import (
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"errors"
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"fmt"
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"github.com/miekg/dns"
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"net"
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"net/http"
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"strings"
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)
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// Parse a URL of the form PUT /name/<identifier>/<ip-address>
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func parseUrl(url string) (identifier string, ipaddr string, err error) {
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parts := strings.Split(url, "/")
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if len(parts) != 4 {
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return "", "", errors.New("Unable to parse url: " + url)
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}
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return parts[2], parts[3], nil
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}
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func ListenHttp(domain string, db Zone, port int) {
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http.HandleFunc("/name/", func(w http.ResponseWriter, r *http.Request) {
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switch r.Method {
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case "PUT":
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identifier, weave_ipstr, err := parseUrl(r.URL.Path)
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name := r.FormValue("fqdn")
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prefix := r.FormValue("routing_prefix")
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local_ip := r.FormValue("local_ip")
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if identifier == "" || weave_ipstr == "" || name == "" || prefix == "" || local_ip == "" {
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Warning.Printf("Invalid request: %s, %s", r.URL, r.Form)
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http.Error(w, "Invalid Request", http.StatusBadRequest)
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return
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}
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ip := net.ParseIP(local_ip)
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if ip == nil {
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Warning.Printf("Invalid IP in request: %s", local_ip)
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http.Error(w, "Invalid IP in request", http.StatusBadRequest)
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return
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}
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weave_cidr := weave_ipstr + "/" + prefix
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weave_ip, subnet, err := net.ParseCIDR(weave_cidr)
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if err != nil {
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Warning.Printf("Invalid CIDR in request: %s", weave_cidr)
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http.Error(w, fmt.Sprintf("Invalid CIDR: %s", weave_cidr), http.StatusBadRequest)
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return
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}
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if dns.IsSubDomain(domain, name) {
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Info.Printf("Adding %s (%s) -> %s", name, local_ip, weave_cidr)
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err = db.AddRecord(identifier, name, ip, weave_ip, subnet)
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if err != nil {
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dup, ok := err.(DuplicateError)
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if !ok {
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Error.Print("Unexpected error from DB", err)
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http.Error(w, "Internal error", http.StatusInternalServerError)
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} else if dup.Ident != identifier {
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http.Error(w, err.Error(), http.StatusConflict)
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}
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return
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}
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} else {
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Info.Printf("Ignoring name %s, not in %s", name, domain)
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}
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case "DELETE":
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identifier, weave_ipstr, err := parseUrl(r.URL.Path)
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if identifier == "" || weave_ipstr == "" {
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Warning.Printf("Invalid request: %s, %s", r.URL, r.Form)
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http.Error(w, "Invalid Request", http.StatusBadRequest)
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return
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}
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weave_ip := net.ParseIP(weave_ipstr)
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if weave_ip == nil {
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Warning.Printf("Invalid IP in request: %s", weave_ipstr)
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http.Error(w, "Invalid IP in request", http.StatusBadRequest)
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return
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}
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Info.Printf("Deleting %s (%s)", identifier, weave_ipstr)
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err = db.DeleteRecord(identifier, weave_ip)
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if err != nil {
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if _, ok := err.(LookupError); !ok {
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Error.Print("Unexpected error from DB", err)
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http.Error(w, "Internal error", http.StatusInternalServerError)
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return
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}
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}
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default:
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Warning.Println("Unexpected http method", r.Method)
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http.Error(w, "Unexpected http method: "+r.Method, http.StatusBadRequest)
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}
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})
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address := fmt.Sprintf(":%d", port)
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err := http.ListenAndServe(address, nil)
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if err != nil {
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Error.Fatal("Unable to create http listener: ", err)
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}
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}
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