istio.io/istio@v0.0.0-20240520182934-d79c90f27776/istioctl/pkg/writer/ztunnel/configdump/connections.go (about)

     1  // Copyright Istio Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package configdump
    16  
    17  import (
    18  	"cmp"
    19  	"encoding/json"
    20  	"fmt"
    21  	"net"
    22  	"strings"
    23  
    24  	"sigs.k8s.io/yaml"
    25  
    26  	"istio.io/istio/pkg/maps"
    27  	"istio.io/istio/pkg/slices"
    28  )
    29  
    30  type ConnectionsFilter struct {
    31  	Namespace string
    32  	Direction string
    33  	Raw       bool
    34  }
    35  
    36  func (c *ConfigWriter) PrintConnectionsDump(filter ConnectionsFilter, outputFormat string) error {
    37  	d := c.ztunnelDump
    38  	workloads := maps.Values(d.WorkloadState)
    39  	workloads = slices.SortFunc(workloads, func(a, b WorkloadState) int {
    40  		if r := cmp.Compare(a.Info.Namespace, b.Info.Namespace); r != 0 {
    41  			return r
    42  		}
    43  		return cmp.Compare(a.Info.Namespace, b.Info.Namespace)
    44  	})
    45  	workloads = slices.FilterInPlace(workloads, func(state WorkloadState) bool {
    46  		if filter.Namespace != "" && filter.Namespace != state.Info.Namespace {
    47  			return false
    48  		}
    49  		return true
    50  	})
    51  	out, err := json.MarshalIndent(workloads, "", "    ")
    52  	if err != nil {
    53  		return fmt.Errorf("failed to marshal workloads: %v", err)
    54  	}
    55  	if outputFormat == "yaml" {
    56  		if out, err = yaml.JSONToYAML(out); err != nil {
    57  			return err
    58  		}
    59  	}
    60  	fmt.Fprintln(c.Stdout, string(out))
    61  	return nil
    62  }
    63  
    64  func (c *ConfigWriter) PrintConnectionsSummary(filter ConnectionsFilter) error {
    65  	w := c.tabwriter()
    66  	d := c.ztunnelDump
    67  	serviceNames := map[string]string{}
    68  	workloadNames := map[string]string{}
    69  	for netIP, s := range d.Services {
    70  		_, ip, _ := strings.Cut(netIP, "/")
    71  		serviceNames[ip] = s.Hostname
    72  	}
    73  	for netIP, s := range d.Workloads {
    74  		_, ip, _ := strings.Cut(netIP, "/")
    75  		workloadNames[ip] = s.Name + "." + s.Namespace
    76  	}
    77  	lookupIP := func(addr string) string {
    78  		if filter.Raw {
    79  			return addr
    80  		}
    81  		ip, port, _ := net.SplitHostPort(addr)
    82  		if s, f := serviceNames[ip]; f {
    83  			return net.JoinHostPort(s, port)
    84  		}
    85  		if w, f := workloadNames[ip]; f {
    86  			return net.JoinHostPort(w, port)
    87  		}
    88  		return addr
    89  	}
    90  	fmt.Fprintln(w, "WORKLOAD\tDIRECTION\tLOCAL\tREMOTE\tREMOTE TARGET")
    91  	workloads := maps.Values(d.WorkloadState)
    92  	workloads = slices.SortFunc(workloads, func(a, b WorkloadState) int {
    93  		if r := cmp.Compare(a.Info.Namespace, b.Info.Namespace); r != 0 {
    94  			return r
    95  		}
    96  		return cmp.Compare(a.Info.Namespace, b.Info.Namespace)
    97  	})
    98  	for _, wl := range workloads {
    99  		if filter.Namespace != "" && filter.Namespace != wl.Info.Namespace {
   100  			continue
   101  		}
   102  		name := fmt.Sprintf("%s.%s", wl.Info.Name, wl.Info.Namespace)
   103  		if filter.Direction != "outbound" {
   104  			for _, c := range wl.Connections.Inbound {
   105  				fmt.Fprintf(w, "%v\tInbound\t%v\t%v\t%v\n", name, lookupIP(c.ActualDst), lookupIP(c.Src), c.OriginalDst)
   106  			}
   107  		}
   108  		if filter.Direction != "inbound" {
   109  			for _, c := range wl.Connections.Outbound {
   110  				fmt.Fprintf(w, "%v\tOutbound\t%v\t%v\t%v\n", name, lookupIP(c.Src), lookupIP(c.ActualDst), lookupIP(c.OriginalDst))
   111  			}
   112  		}
   113  	}
   114  	return w.Flush()
   115  }