pkg/tools/ip/tcpresolver.go

// Licensed to Apache Software Foundation (ASF) under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Apache Software Foundation (ASF) licenses this file to you 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 ip

import (
	"fmt"

	"github.com/apache/skywalking-rover/pkg/tools/enums"

	processNet "github.com/shirou/gopsutil/net"
)

type SocketPair struct {
	Family   uint32
	Role     enums.ConnectionRole
	SrcIP    string
	SrcPort  uint16
	DestIP   string
	DestPort uint16
}

func (s *SocketPair) IsValid() bool {
	return s.Family != 0 && s.Role != enums.ConnectionRoleUnknown &&
		s.SrcIP != "" && s.SrcPort != 0 && s.DestIP != "" && s.DestPort != 0
}

func ParseSocket(pid, sockfd uint32) (*SocketPair, error) {
	connections, err := processNet.ConnectionsPid("tcp", int32(pid))
	if err != nil {
		return nil, fmt.Errorf("cannot get all connections from pid: %d", pid)
	}

	for _, connection := range connections {
		if connection.Fd == sockfd {
			return &SocketPair{
				Family:   connection.Family,
				SrcIP:    connection.Laddr.IP,
				SrcPort:  uint16(connection.Laddr.Port),
				DestIP:   connection.Raddr.IP,
				DestPort: uint16(connection.Raddr.Port),
			}, nil
		}
	}
	return nil, fmt.Errorf("cannot found the connection, pid: %d, socket FD: %d", pid, sockfd)
}