netmaker/netclient/server/grpc.go

package server

import (
        "google.golang.org/grpc/credentials"
        "crypto/tls"
	"fmt"
	"context"
	"log"
	"strings"
	"strconv"
	"net"
	"time"
	"io"
        "golang.zx2c4.com/wireguard/wgctrl/wgtypes"
	"github.com/gravitl/netmaker/netclient/config"
        "github.com/gravitl/netmaker/netclient/auth"
        "github.com/gravitl/netmaker/netclient/local"
        nodepb "github.com/gravitl/netmaker/grpc"
        "google.golang.org/grpc"
	"google.golang.org/grpc/metadata"
	//homedir "github.com/mitchellh/go-homedir"
)

func GetNode(network string) nodepb.Node {

        modcfg, err := config.ReadConfig(network)
        if err != nil {
                log.Fatalf("Error: %v", err)
        }

	nodecfg := modcfg.Node
	var node nodepb.Node

	node.Name = nodecfg.Name
	node.Interface = nodecfg.Interface
	node.Nodenetwork = nodecfg.Network
	node.Localaddress = nodecfg.LocalAddress
	node.Address = nodecfg.WGAddress
	node.Address6 = nodecfg.WGAddress6
	node.Listenport = nodecfg.Port
	node.Keepalive = nodecfg.KeepAlive
	node.Postup = nodecfg.PostUp
	node.Postdown = nodecfg.PostDown
	node.Publickey = nodecfg.PublicKey
	node.Macaddress = nodecfg.MacAddress
	node.Endpoint = nodecfg.Endpoint
	node.Password = nodecfg.Password
	if nodecfg.DNS == "on" {
		node.Dnsoff = false
	} else {
		node.Dnsoff = true
	}
        if nodecfg.IsDualStack == "yes" {
                node.Isdualstack = true
        } else {
                node.Isdualstack = false
        }
        if nodecfg.IsIngressGateway == "yes" {
                node.Isingressgateway= true
        } else {
                node.Isingressgateway = false
        }
        return node
}



func RemoveNetwork(network string) error {
        //need to  implement checkin on server side
        cfg, err := config.ReadConfig(network)
        if err != nil {
                return err
        }
	servercfg := cfg.Server
        node := cfg.Node
	fmt.Println("Deleting remote node with MAC: " + node.MacAddress)

        var wcclient nodepb.NodeServiceClient
        var requestOpts grpc.DialOption
        requestOpts = grpc.WithInsecure()
        if cfg.Server.GRPCSSL == "on" {
                h2creds := credentials.NewTLS(&tls.Config{NextProtos: []string{"h2"}})
                requestOpts = grpc.WithTransportCredentials(h2creds)
        }
        conn, err := grpc.Dial(servercfg.GRPCAddress, requestOpts)
	if err != nil {
                log.Printf("Unable to establish client connection to " + servercfg.GRPCAddress + ": %v", err)
		//return err
        }else {
        wcclient = nodepb.NewNodeServiceClient(conn)

        ctx := context.Background()
        ctx, err = auth.SetJWT(wcclient, network)
        if err != nil {
                //return err
                log.Printf("Failed to authenticate: %v", err)
        } else {

        var header metadata.MD

        _, err = wcclient.DeleteNode(
                ctx,
                &nodepb.DeleteNodeReq{
                        Macaddress: node.MacAddress,
                        NetworkName: node.Network,
                },
                grpc.Header(&header),
        )
        if err != nil {
		log.Printf("Encountered error deleting node: %v", err)
		fmt.Println(err)
        } else {
		fmt.Println("Deleted node " + node.MacAddress)
	}
	}
	}
	err = local.WipeLocal(network)
	if err != nil {
                log.Printf("Unable to wipe local config: %v", err)
	}
	if cfg.Daemon != "off" {
		err =  local.RemoveSystemDServices(network)
	}
	return err
}

func GetPeers(macaddress string, network string, server string, dualstack bool, isIngressGateway bool) ([]wgtypes.PeerConfig, bool, []string, error) {
        //need to  implement checkin on server side
        hasGateway := false
        var gateways []string
        var peers []wgtypes.PeerConfig
        var wcclient nodepb.NodeServiceClient
        cfg, err := config.ReadConfig(network)
        if err != nil {
                log.Fatalf("Issue retrieving config for network: " + network +  ". Please investigate: %v", err)
        }
        nodecfg := cfg.Node
        keepalive := nodecfg.KeepAlive
        keepalivedur, err := time.ParseDuration(strconv.FormatInt(int64(keepalive), 10) + "s")
        if err != nil {
                log.Fatalf("Issue with format of keepalive value. Please update netconfig: %v", err)
        }


        requestOpts := grpc.WithInsecure()
        if cfg.Server.GRPCSSL == "on" {
                h2creds := credentials.NewTLS(&tls.Config{NextProtos: []string{"h2"}})
                requestOpts = grpc.WithTransportCredentials(h2creds)
        }

	conn, err := grpc.Dial(server, requestOpts)
        if err != nil {
                log.Fatalf("Unable to establish client connection to localhost:50051: %v", err)
        }
        // Instantiate the BlogServiceClient with our client connection to the server
        wcclient = nodepb.NewNodeServiceClient(conn)

        req := &nodepb.GetPeersReq{
                Macaddress: macaddress,
                Network: network,
        }
        ctx := context.Background()
        ctx, err = auth.SetJWT(wcclient, network)
        if err != nil {
                log.Println("Failed to authenticate.")
                return peers, hasGateway, gateways, err
        }
        var header metadata.MD

        stream, err := wcclient.GetPeers(ctx, req, grpc.Header(&header))
        if err != nil {
                log.Println("Error retrieving peers")
                log.Println(err)
                return nil, hasGateway, gateways, err
        }
        for {
                res, err := stream.Recv()
                // If end of stream, break the loop

                if err == io.EOF {
                        break
                }
                // if err, return an error
                if err != nil {
                        if strings.Contains(err.Error(), "mongo: no documents in result") {
                                continue
                        } else {
                        fmt.Println("ERROR ENCOUNTERED WITH RESPONSE")
                        fmt.Println(res)
                        return peers, hasGateway, gateways, err
                        }
                }
                pubkey, err := wgtypes.ParseKey(res.Peers.Publickey)
                if err != nil {
                        fmt.Println("error parsing key")
                        return peers, hasGateway, gateways, err
                }

                if nodecfg.PublicKey == res.Peers.Publickey {
                        continue
                }
                if nodecfg.Endpoint == res.Peers.Endpoint {
                        if nodecfg.LocalAddress != res.Peers.Localaddress && res.Peers.Localaddress != "" {
				res.Peers.Endpoint = res.Peers.Localaddress
			} else {
				continue
			}
                }

                var peer wgtypes.PeerConfig
                var peeraddr = net.IPNet{
                        IP: net.ParseIP(res.Peers.Address),
                        Mask: net.CIDRMask(32, 32),
                }
                var allowedips []net.IPNet
                allowedips = append(allowedips, peeraddr)
                if res.Peers.Isegressgateway {
                        hasGateway = true
                        gateways = append(gateways,res.Peers.Egressgatewayrange)
                        _, ipnet, err := net.ParseCIDR(res.Peers.Egressgatewayrange)
                        if err != nil {
                                fmt.Println("ERROR ENCOUNTERED SETTING GATEWAY")
                                fmt.Println("NOT SETTING GATEWAY")
                                fmt.Println(err)
                        } else {
                                fmt.Println("    Gateway Range: "  + res.Peers.Egressgatewayrange)
                                allowedips = append(allowedips, *ipnet)
                        }
                }
                if res.Peers.Address6 != "" && dualstack {
                        var addr6 = net.IPNet{
                                IP: net.ParseIP(res.Peers.Address6),
                                Mask: net.CIDRMask(128, 128),
                        }
                        allowedips = append(allowedips, addr6)
                }
                if keepalive != 0 {
                peer = wgtypes.PeerConfig{
                        PublicKey: pubkey,
                        PersistentKeepaliveInterval: &keepalivedur,
                        Endpoint: &net.UDPAddr{
                                IP:   net.ParseIP(res.Peers.Endpoint),
                                Port: int(res.Peers.Listenport),
                        },
                        ReplaceAllowedIPs: true,
                        AllowedIPs: allowedips,
                        }
                } else {
                peer = wgtypes.PeerConfig{
                        PublicKey: pubkey,
                        Endpoint: &net.UDPAddr{
                                IP:   net.ParseIP(res.Peers.Endpoint),
                                Port: int(res.Peers.Listenport),
                        },
                        ReplaceAllowedIPs: true,
                        AllowedIPs: allowedips,
                        }
                }
                peers = append(peers, peer)

        }
        if isIngressGateway {
                extPeers, err := GetExtPeers(macaddress, network, server, dualstack)
                if err == nil {
                        peers = append(peers, extPeers...)
                } else {
                        fmt.Println("ERROR RETRIEVING EXTERNAL PEERS")
                        fmt.Println(err)
                }
        }
        return peers, hasGateway, gateways, err
}

func GetExtPeers(macaddress string, network string, server string, dualstack bool) ([]wgtypes.PeerConfig, error) {
        var peers []wgtypes.PeerConfig
        var wcclient nodepb.NodeServiceClient
        cfg, err := config.ReadConfig(network)
        if err != nil {
                log.Fatalf("Issue retrieving config for network: " + network +  ". Please investigate: %v", err)
        }
        nodecfg := cfg.Node

        requestOpts := grpc.WithInsecure()
        conn, err := grpc.Dial(server, requestOpts)
        if err != nil {
                log.Fatalf("Unable to establish client connection to localhost:50051: %v", err)
        }
        // Instantiate the BlogServiceClient with our client connection to the server
        wcclient = nodepb.NewNodeServiceClient(conn)

        req := &nodepb.GetExtPeersReq{
                Macaddress: macaddress,
                Network: network,
        }
        ctx := context.Background()
        ctx, err = auth.SetJWT(wcclient, network)
        if err != nil {
                fmt.Println("Failed to authenticate.")
                return peers, err
        }
        var header metadata.MD

        stream, err := wcclient.GetExtPeers(ctx, req, grpc.Header(&header))
        if err != nil {
                fmt.Println("Error retrieving peers")
                fmt.Println(err)
                return nil, err
        }
        for {
                res, err := stream.Recv()
                // If end of stream, break the loop

                if err == io.EOF {
                        break
                }
                // if err, return an error
                if err != nil {
                        if strings.Contains(err.Error(), "mongo: no documents in result") {
                                continue
                        } else {
                        fmt.Println("ERROR ENCOUNTERED WITH RESPONSE")
                        fmt.Println(res)
                        return peers, err
                        }
                }
                pubkey, err := wgtypes.ParseKey(res.Extpeers.Publickey)
                if err != nil {
                        fmt.Println("error parsing key")
                        return peers, err
                }

                if nodecfg.PublicKey == res.Extpeers.Publickey {
                        continue
                }

                var peer wgtypes.PeerConfig
                var peeraddr = net.IPNet{
                        IP: net.ParseIP(res.Extpeers.Address),
                        Mask: net.CIDRMask(32, 32),
                }
                var allowedips []net.IPNet
                allowedips = append(allowedips, peeraddr)

		if res.Extpeers.Address6 != "" && dualstack {
                        var addr6 = net.IPNet{
                                IP: net.ParseIP(res.Extpeers.Address6),
                                Mask: net.CIDRMask(128, 128),
                        }
                        allowedips = append(allowedips, addr6)
                }
                peer = wgtypes.PeerConfig{
                        PublicKey: pubkey,
                        ReplaceAllowedIPs: true,
                        AllowedIPs: allowedips,
                        }
                peers = append(peers, peer)

        }
        return peers, err
}