英文:
Dial with a specific address / interface ? Golang
问题
我在我的计算机上有两个网络接口(eth0和eth1),我正在尝试使用特定的接口(eth1)拨号连接。根据Go是一种系统语言的说法,我假设可以通过当前的标准库实现,但实际上可以吗?
到目前为止,我已经通过名称[InterfaceByName
][1](eth1
)获取了接口,然后我遍历[Addrs
][2]方法并提取了第一个地址[0],它似乎是eth1接口的源地址(例如xxx.xxx.xxx/24);另一个是IPv6地址。
我创建了一个新的[Dialer
][3]并设置了[Dialer.LocalAddr
][4]为提取的地址。然而,我遇到了这个错误mismatched local address type
,似乎与[dial.go][5]中的dialSingle函数有关。
编辑
一些代码:
package main
import (
"net"
"log"
)
func main(){
ief, err := net.InterfaceByName("eth1")
if err !=nil{
log.Fatal(err)
}
addrs, err := ief.Addrs()
if err !=nil{
log.Fatal(err)
}
d := net.Dialer{LocalAddr: addrs[0]}
_, err = d.Dial("tcp", "google.com:80")
if err != nil {
log.Fatal(err)
}
}
输出:
2014/12/10 17:11:48 dial tcp 216.58.208.32:80: mismatched local address type ip+net
[1]: http://golang.org/pkg/net/#InterfaceByName
[2]: http://golang.org/pkg/net/#Interface.Addrs
[3]: http://golang.org/pkg/net/#Dialer
[4]: http://golang.org/src/pkg/net/dial.go?s=1060:1271#L7
[5]: http://golang.org/src/pkg/net/dial.go
英文:
I have two network interfaces on my computer ( eth0 and eth1) and I'm trying to Dial a connection using a specific one (eth1). Given the statement that Go is a system language I assumed so but is it really possible with the current standard library?
So far I've got to get the interface by name [InterfaceByName
][1] (eth1
) then I range over the [Addrs
][2] method and extracted the first address [0] which seems to be the source address of eth1 interface (e.g. xxx.xxx.xxx/24); the other one is the ipv6 address.
I've created a new [Dialer
][3] and set [Dialer.LocalAddr
][4] with the address extracted. However I get this error mismatched local address type
wich seems related to dialSingle function from [dial.go][5]
Edit
Some code:
package main
import (
"net"
"log"
)
func main(){
ief, err := net.InterfaceByName("eth1")
if err !=nil{
log.Fatal(err)
}
addrs, err := ief.Addrs()
if err !=nil{
log.Fatal(err)
}
d := net.Dialer{LocalAddr: addrs[0]}
_, err = d.Dial("tcp", "google.com:80")
if err != nil {
log.Fatal(err)
}
}
Output:
2014/12/10 17:11:48 dial tcp 216.58.208.32:80: mismatched local address type ip+net
[1]: http://golang.org/pkg/net/#InterfaceByName
[2]: http://golang.org/pkg/net/#Interface.Addrs
[3]: http://golang.org/pkg/net/#Dialer
[4]: http://golang.org/src/pkg/net/dial.go?s=1060:1271#L7
[5]: http://golang.org/src/pkg/net/dial.go
答案1
得分: 14
当你从一个接口中获取地址时,它的类型是*net.IPNet
,包装在一个net.Addr
接口中,其中包含一个地址和子网掩码,而不是地址和端口。你可以使用IP地址,但是在将其断言为*net.IPNet
之后,你需要创建一个新的TCPAddr
。
ief, err := net.InterfaceByName("eth1")
if err != nil {
log.Fatal(err)
}
addrs, err := ief.Addrs()
if err != nil {
log.Fatal(err)
}
tcpAddr := &net.TCPAddr{
IP: addrs[0].(*net.IPNet).IP,
}
英文:
When you pull the address from an interface, it's of type *net.IPnet
wrapped in a net.Addr
interface, which contains an address and netmask NOT an address and port. You can use the IP address, however, you have to create a new TCPAddr
after asserting it as a *net.IPnet
ief, err := net.InterfaceByName("eth1")
if err !=nil{
log.Fatal(err)
}
addrs, err := ief.Addrs()
if err !=nil{
log.Fatal(err)
}
tcpAddr := &net.TCPAddr{
IP: addrs[0].(*net.IPNet).IP,
}
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