forked from go-ping/ping
/
ping_linux.go
210 lines (185 loc) · 4.47 KB
/
ping_linux.go
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//go:build linux
// +build linux
package ping
import (
"context"
"net"
"net/netip"
"os"
"strings"
"syscall"
"time"
"golang.org/x/net/icmp"
)
func (p *Pinger) resolve1() error {
p.logger.Debugf("resolve1")
// check is ip address
if ip, err := netip.ParseAddr(p.addr); err == nil {
addr := &net.IPAddr{
IP: net.IP(ip.AsSlice()).To16(),
Zone: ip.Zone(),
}
p.ipv4 = isIPv4(addr.IP)
p.ipaddr = addr
p.logger.Debugf("addr is ip, skip dns resolve")
return nil
}
lookupIp := func(dns, network, addr string) (net.IP, error) {
r := net.Resolver{
PreferGo: true,
StrictErrors: false,
Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
d := net.Dialer{
ControlContext: func(ctx context.Context, network, address string, c syscall.RawConn) (err error) {
if p.BindInterface != "" {
p.logger.Debugf("bind to interface: %s, resolve dns", p.BindInterface)
_ = c.Control(func(fd uintptr) {
err = syscall.BindToDevice(int(fd), p.BindInterface)
if err != nil {
err = os.NewSyscallError("BindToDevice", err)
}
})
}
return
},
}
if p.Source != "" {
p.logger.Debugf("bind dns dialer to source: %s", p.Source)
ip, err := net.ResolveIPAddr("", p.Source)
if err != nil {
return nil, err
}
d.LocalAddr = ip
}
if dns != "" {
address := net.JoinHostPort(dns, "53")
p.logger.Debugf("dial dns: %s", address)
return d.DialContext(ctx, network, address)
} else {
p.logger.Debugf("dial dns: %s", address)
return d.DialContext(ctx, network, address)
}
},
}
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
p.logger.Debugf("lookup ip: %s, network: %s", addr, network)
ipList, err := r.LookupIP(ctx, network, addr)
cancel()
if err != nil {
return nil, err
}
for _, ip := range ipList {
p.logger.Debugf("lookup ip return: %s", ip.String())
}
if len(ipList) == 1 { // only one ip
return ipList[0], nil
/*p.ipv4 = isIPv4(ipList[0])
p.ipaddr = &net.IPAddr{
IP: ipList[0],
Zone: "",
}*/
}
switch network {
case "ip": // return first
return ipList[0], nil
case "ip4":
for _, ip := range ipList {
if isIPv4(ip) {
return ip, nil
}
}
return nil, &net.DNSError{
Err: "no ipv4 addr",
Name: addr,
Server: dns,
IsTimeout: false,
IsTemporary: false,
IsNotFound: true,
}
case "ip6":
for _, ip := range ipList {
if !isIPv4(ip) {
return ip, nil
}
}
return nil, &net.DNSError{
Err: "no ipv6 addr",
Name: addr,
Server: dns,
IsTimeout: false,
IsTemporary: false,
IsNotFound: true,
}
default:
return nil, &net.DNSError{
Err: "unknown network",
Name: addr,
Server: dns,
IsTimeout: false,
IsTemporary: false,
IsNotFound: false,
}
}
}
dnsList := strings.Split(p.DNS, ";")
p.logger.Debugf("resolve by dns list: %#v", dnsList)
for index, dns := range dnsList {
ip, err := lookupIp(dns, p.network, p.addr)
if err == nil {
p.ipv4 = isIPv4(ip)
p.ipaddr = &net.IPAddr{
IP: ip,
Zone: "",
}
return nil
}
if err != nil {
p.logger.Warnf("lookup dns: %s, error: %s", dns, err.Error())
}
if err != nil && index == len(dns)-1 { // last dns
return err
}
}
return &net.DNSError{
Err: "no such host",
Name: p.addr,
Server: "",
IsTimeout: false,
IsTemporary: false,
IsNotFound: true,
}
}
func (p *Pinger) listen() (packetConn, error) {
var (
conn packetConn
err error
)
if p.BindInterface != "" {
if p.ipv4 {
p.logger.Debugf("listenPacket2, network: %s, address: %s, interface: %s", ipv4Proto[p.protocol], p.Source, p.BindInterface)
var c icmpv4Conn2
c.c, err = listenPacket2(ipv4Proto[p.protocol], p.Source, p.BindInterface)
conn = &c
} else {
p.logger.Debugf("listenPacket2, network: %s, address: %s, interface: %s", ipv6Proto[p.protocol], p.Source, p.BindInterface)
var c icmpV6Conn2
c.c, err = listenPacket2(ipv6Proto[p.protocol], p.Source, p.BindInterface)
conn = &c
}
} else {
if p.ipv4 {
var c icmpv4Conn
c.c, err = icmp.ListenPacket(ipv4Proto[p.protocol], p.Source)
conn = &c
} else {
var c icmpV6Conn
c.c, err = icmp.ListenPacket(ipv6Proto[p.protocol], p.Source)
conn = &c
}
}
if err != nil {
p.Stop()
return nil, err
}
return conn, nil
}