From 77c172b823b64ebface655681ab0749b9d2f7081 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ra=C3=BAl=20Benencia?= <raul@thousandeyes.com>
Date: Fri, 13 Apr 2018 16:30:31 -0700
Subject: First public commit

---
 internal/handlers/polling.go | 161 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 161 insertions(+)
 create mode 100644 internal/handlers/polling.go

(limited to 'internal/handlers/polling.go')

diff --git a/internal/handlers/polling.go b/internal/handlers/polling.go
new file mode 100644
index 0000000..12f36e2
--- /dev/null
+++ b/internal/handlers/polling.go
@@ -0,0 +1,161 @@
+// Copyright 2018 ThousandEyes Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package handlers
+
+import (
+	"encoding/json"
+	"fmt"
+	"net"
+	"net/http"
+	"os"
+
+	"github.com/gorilla/mux"
+	"github.com/thousandeyes/shoelaces/internal/log"
+	"github.com/thousandeyes/shoelaces/internal/polling"
+	"github.com/thousandeyes/shoelaces/internal/server"
+	"github.com/thousandeyes/shoelaces/internal/utils"
+)
+
+// PollHandler is called by iPXE boot agents. It returns the boot script
+// specified on the configuration or, if the host is unknown, it makes it
+// retry for a while until the user specifies alternative IPXE boot script.
+func PollHandler(w http.ResponseWriter, r *http.Request) {
+	env := envFromRequest(r)
+
+	ip, _, err := net.SplitHostPort(r.RemoteAddr)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	vars := mux.Vars(r)
+	// iPXE MAC addresses come with dashes instead of colons
+	mac := utils.MacDashToColon(vars["mac"])
+	host := r.FormValue("host")
+
+	err = validateMACAndIP(env.Logger, mac, ip)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	if host == "" {
+		host = resolveHostname(env.Logger, ip)
+	}
+
+	server := server.New(mac, ip, host)
+	script, err := polling.Poll(
+		env.Logger, env.ServerStates, env.HostnameMaps, env.NetworkMaps,
+		env.EventLog, env.Templates, env.BaseURL, server)
+
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	w.Write([]byte(script))
+}
+
+// ServerListHandler provides a list of the servers that tried to boot
+// but did not match the hostname regex or network mappings.
+func ServerListHandler(w http.ResponseWriter, r *http.Request) {
+	env := envFromRequest(r)
+
+	servers, err := json.Marshal(polling.ListServers(env.ServerStates))
+	if err != nil {
+		env.Logger.Error("component", "handler", "err", err)
+		os.Exit(1)
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.Write(servers)
+}
+
+// UpdateTargetHandler is a POST endpoint that receives parameters for
+// booting manually.
+func UpdateTargetHandler(w http.ResponseWriter, r *http.Request) {
+	env := envFromRequest(r)
+
+	ip, _, err := net.SplitHostPort(r.RemoteAddr)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	if err := r.ParseForm(); err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+	mac, scriptName, environment, params := parsePostForm(r.PostForm)
+	if mac == "" || scriptName == "" {
+		http.Error(w, "MAC address and target must not be empty", http.StatusBadRequest)
+		return
+	}
+
+	server := server.New(mac, ip, "")
+	inputErr, err := polling.UpdateTarget(
+		env.Logger, env.ServerStates, env.Templates, env.EventLog, env.BaseURL, server,
+		scriptName, environment, params)
+
+	if err != nil {
+		if inputErr {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+		} else {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+		}
+		return
+	}
+	http.Redirect(w, r, "/", http.StatusFound)
+}
+
+func parsePostForm(form map[string][]string) (mac, scriptName, environment string, params map[string]interface{}) {
+	params = make(map[string]interface{})
+	for k, v := range form {
+		if k == "mac" {
+			mac = utils.MacDashToColon(v[0])
+		} else if k == "target" {
+			scriptName = v[0]
+		} else if k == "environment" {
+			environment = v[0]
+		} else {
+			params[k] = v[0]
+		}
+	}
+	return
+}
+
+func validateMACAndIP(logger log.Logger, mac string, ip string) (err error) {
+	if !utils.IsValidMAC(mac) {
+		logger.Error("component", "polling", "msg", "Invalid MAC", "mac", mac)
+		return fmt.Errorf("%s", "Invalid MAC")
+	}
+
+	if !utils.IsValidIP(ip) {
+		logger.Error("component", "polling", "msg", "Invalid IP", "ip", ip)
+		return fmt.Errorf("%s", "Invalid IP")
+	}
+
+	logger.Debug("component", "polling", "msg", "MAC and IP validated", "mac", mac, "ip", ip)
+
+	return nil
+}
+
+func resolveHostname(logger log.Logger, ip string) string {
+	host := utils.ResolveHostname(ip)
+	if host == "" {
+		logger.Info("component", "polling", "msg", "Can't resolve IP", "ip", ip)
+	}
+
+	return host
+}
-- 
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