108 lines
3.0 KiB
Go
108 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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"log"
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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 httpErrorAndLog(level *log.Logger, w http.ResponseWriter, msg string,
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status int, logmsg string, logargs ...interface{}) {
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http.Error(w, msg, status)
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level.Printf(logmsg, logargs...)
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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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reqError := func(msg string, logmsg string, logargs ...interface{}) {
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httpErrorAndLog(Warning, w, msg, http.StatusBadRequest,
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logmsg, logargs...)
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}
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switch r.Method {
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case "PUT":
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ident, weaveIPstr, err := parseUrl(r.URL.Path)
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name := r.FormValue("fqdn")
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localIPstr := r.FormValue("local_ip")
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if ident == "" || weaveIPstr == "" || name == "" || localIPstr == "" {
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reqError("Invalid request", "Invalid request: %s, %s", r.URL, r.Form)
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return
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}
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localIP := net.ParseIP(localIPstr)
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if localIP == nil {
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reqError("Invalid IP in request", "Invalid IP in request: %s", localIPstr)
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return
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}
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weaveIP := net.ParseIP(weaveIPstr)
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if weaveIP == nil {
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reqError("Invalid weave IP", "Invalid weave IP in request: %s", weaveIPstr)
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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, localIPstr, weaveIPstr)
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if err = db.AddRecord(ident, name, localIP, weaveIP); err != nil {
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if dup, ok := err.(DuplicateError); !ok {
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httpErrorAndLog(
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Error, w, "Internal error", http.StatusInternalServerError,
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"Unexpected error from DB: %s", err)
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return
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} else if dup.Ident != ident {
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http.Error(w, err.Error(), http.StatusConflict)
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return
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} // else we are golden
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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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ident, weaveIPstr, err := parseUrl(r.URL.Path)
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if ident == "" || weaveIPstr == "" {
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reqError("Invalid Request", "Invalid request: %s, %s", r.URL, r.Form)
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return
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}
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weaveIP := net.ParseIP(weaveIPstr)
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if weaveIP == nil {
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reqError("Invalid IP in request", "Invalid IP in request: %s", weaveIPstr)
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return
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}
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Info.Printf("Deleting %s (%s)", ident, weaveIPstr)
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if err = db.DeleteRecord(ident, weaveIP); err != nil {
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if _, ok := err.(LookupError); !ok {
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httpErrorAndLog(
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Error, w, "Internal error", http.StatusInternalServerError,
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"Unexpected error from DB: %s", err)
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return
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}
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}
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default:
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msg := "Unexpected http method: " + r.Method
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reqError(msg, msg)
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return
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}
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})
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address := fmt.Sprintf(":%d", port)
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if err := http.ListenAndServe(address, nil); 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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