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Golang http client through VPN (openVPN) / set network interface
Webbased or Thick-client through VPN?Connecting to VPN through a custom clientHow to set HTTP headers (for cache-control)?authenticated http client requests from golangSetting HTTP headersHow to set headers in http get request?Setting up proxy for HTTP clientHow to set timeout for http.Get() requests in Golang?How to check if a network interface is a VPN in AndroidSpecify network interface for http request in Golang
I have to make http requests through VPN. There is php code using cURL making what I need, nothing additional:
curl_setopt($cu, CURLOPT_INTERFACE, "tun0");
This interface from ifconfig:
tun0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1500
inet 10.13.13.2 netmask 255.255.255.255 destination 10.13.13.1
inet6 fe80::80ee:132:d102:a52d prefixlen 64 scopeid 0x20<link>
unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 100 (UNSPEC)
My go code (as I understand, I should bind to ip of tun0):
package main
import (
"io/ioutil"
"log"
"net"
"net/http"
"time"
)
func main()
httpTransport := &http.Transport
ief, err := net.InterfaceByName("tun0")
if err != nil
log.Fatal(err)
addrs, err := ief.Addrs()
if err != nil
log.Fatal(err)
tcpAddr := &net.TCPAddrIP: addrs[0].(*net.IPNet).IP
println(tcpAddr.String())
httpTransport.Dial = (&net.Dialer
Timeout: 20 * time.Second,
LocalAddr: tcpAddr,
).Dial
c := &http.Client
Transport: httpTransport,
Timeout: 30 * time.Second,
req, err := http.NewRequest(
http.MethodGet,
"http://example.com/",
nil,
)
if err != nil
log.Fatal(err)
resp, err := c.Do(req)
if err != nil
log.Fatal(err)
bytes, err := ioutil.ReadAll(resp.Body)
if err != nil
log.Fatal(err)
println(string(bytes))
So what I get :
10.13.13.2:0
2019/03/21 15:29:42 Get http://example.com/: dial tcp 10.13.13.2:0->93.184.216.34:80: i/o timeout
exit status 1
Php code with cUrl gets this page fast. I tried many times with Go code, so timeouts can do nothing. Any ideas how to replace that one PHP string in Go?
UPDATE
PHP code getting same page via tun0 and it's output:
<?php
$cu = curl_init();
curl_setopt($cu, CURLOPT_URL, "http://example.com");
curl_setopt($cu, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($cu, CURLOPT_CONNECTTIMEOUT, 20);
curl_setopt($cu, CURLOPT_TIMEOUT, 30);
curl_setopt($cu, CURLOPT_INTERFACE, "tun0");
$result = curl_exec($cu);;
curl_close($cu);
echo $result . PHP_EOL;
Output:
<!doctype html>
<html>
<head>
<title>Example Domain</title>
<meta charset="utf-8" />
<meta http-equiv="Content-type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<style type="text/css">
body
background-color: #f0f0f2;
margin: 0;
padding: 0;
font-family: "Open Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
div
width: 600px;
margin: 5em auto;
padding: 50px;
background-color: #fff;
border-radius: 1em;
a:link, a:visited
color: #38488f;
text-decoration: none;
@media (max-width: 700px)
body
background-color: #fff;
div
width: auto;
margin: 0 auto;
border-radius: 0;
padding: 1em;
</style>
</head>
<body>
<div>
<h1>Example Domain</h1>
<p>This domain is established to be used for illustrative examples in documents. You may use this
domain in examples without prior coordination or asking for permission.</p>
<p><a href="http://www.iana.org/domains/example">More information...</a></p>
</div>
</body>
</html>
http go vpn network-interface
asked Mar 21 at 15:51
edwveeedwvee
162
add a comment |
I have to make http requests through VPN. There is php code using cURL making what I need, nothing additional:
curl_setopt($cu, CURLOPT_INTERFACE, "tun0");
This interface from ifconfig:
tun0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1500
inet 10.13.13.2 netmask 255.255.255.255 destination 10.13.13.1
inet6 fe80::80ee:132:d102:a52d prefixlen 64 scopeid 0x20<link>
unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 100 (UNSPEC)
My go code (as I understand, I should bind to ip of tun0):
package main
import (
"io/ioutil"
"log"
"net"
"net/http"
"time"
)
func main()
httpTransport := &http.Transport
ief, err := net.InterfaceByName("tun0")
if err != nil
log.Fatal(err)
addrs, err := ief.Addrs()
if err != nil
log.Fatal(err)
tcpAddr := &net.TCPAddrIP: addrs[0].(*net.IPNet).IP
println(tcpAddr.String())
httpTransport.Dial = (&net.Dialer
Timeout: 20 * time.Second,
LocalAddr: tcpAddr,
).Dial
c := &http.Client
Transport: httpTransport,
Timeout: 30 * time.Second,
req, err := http.NewRequest(
http.MethodGet,
"http://example.com/",
nil,
)
if err != nil
log.Fatal(err)
resp, err := c.Do(req)
if err != nil
log.Fatal(err)
bytes, err := ioutil.ReadAll(resp.Body)
if err != nil
log.Fatal(err)
println(string(bytes))
So what I get :
10.13.13.2:0
2019/03/21 15:29:42 Get http://example.com/: dial tcp 10.13.13.2:0->93.184.216.34:80: i/o timeout
exit status 1
Php code with cUrl gets this page fast. I tried many times with Go code, so timeouts can do nothing. Any ideas how to replace that one PHP string in Go?
UPDATE
PHP code getting same page via tun0 and it's output:
<?php
$cu = curl_init();
curl_setopt($cu, CURLOPT_URL, "http://example.com");
curl_setopt($cu, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($cu, CURLOPT_CONNECTTIMEOUT, 20);
curl_setopt($cu, CURLOPT_TIMEOUT, 30);
curl_setopt($cu, CURLOPT_INTERFACE, "tun0");
$result = curl_exec($cu);;
curl_close($cu);
echo $result . PHP_EOL;
Output:
<!doctype html>
<html>
<head>
<title>Example Domain</title>
<meta charset="utf-8" />
<meta http-equiv="Content-type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<style type="text/css">
body
background-color: #f0f0f2;
margin: 0;
padding: 0;
font-family: "Open Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
div
width: 600px;
margin: 5em auto;
padding: 50px;
background-color: #fff;
border-radius: 1em;
a:link, a:visited
color: #38488f;
text-decoration: none;
@media (max-width: 700px)
body
background-color: #fff;
div
width: auto;
margin: 0 auto;
border-radius: 0;
padding: 1em;
</style>
</head>
<body>
<div>
<h1>Example Domain</h1>
<p>This domain is established to be used for illustrative examples in documents. You may use this
domain in examples without prior coordination or asking for permission.</p>
<p><a href="http://www.iana.org/domains/example">More information...</a></p>
</div>
</body>
</html>
http go vpn network-interface
asked Mar 21 at 15:51
edwveeedwvee
162
Is your vpn connected to internet ?
– user801247
Mar 21 at 22:04
Ofcourse. As I said, same thing with PHP and cURL works fine.
– edwvee
Mar 22 at 13:06
add a comment |
I have to make http requests through VPN. There is php code using cURL making what I need, nothing additional:
curl_setopt($cu, CURLOPT_INTERFACE, "tun0");
This interface from ifconfig:
tun0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1500
inet 10.13.13.2 netmask 255.255.255.255 destination 10.13.13.1
inet6 fe80::80ee:132:d102:a52d prefixlen 64 scopeid 0x20<link>
unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 100 (UNSPEC)
My go code (as I understand, I should bind to ip of tun0):
package main
import (
"io/ioutil"
"log"
"net"
"net/http"
"time"
)
func main()
httpTransport := &http.Transport
ief, err := net.InterfaceByName("tun0")
if err != nil
log.Fatal(err)
addrs, err := ief.Addrs()
if err != nil
log.Fatal(err)
tcpAddr := &net.TCPAddrIP: addrs[0].(*net.IPNet).IP
println(tcpAddr.String())
httpTransport.Dial = (&net.Dialer
Timeout: 20 * time.Second,
LocalAddr: tcpAddr,
).Dial
c := &http.Client
Transport: httpTransport,
Timeout: 30 * time.Second,
req, err := http.NewRequest(
http.MethodGet,
"http://example.com/",
nil,
)
if err != nil
log.Fatal(err)
resp, err := c.Do(req)
if err != nil
log.Fatal(err)
bytes, err := ioutil.ReadAll(resp.Body)
if err != nil
log.Fatal(err)
println(string(bytes))
So what I get :
10.13.13.2:0
2019/03/21 15:29:42 Get http://example.com/: dial tcp 10.13.13.2:0->93.184.216.34:80: i/o timeout
exit status 1
Php code with cUrl gets this page fast. I tried many times with Go code, so timeouts can do nothing. Any ideas how to replace that one PHP string in Go?
UPDATE
PHP code getting same page via tun0 and it's output:
<?php
$cu = curl_init();
curl_setopt($cu, CURLOPT_URL, "http://example.com");
curl_setopt($cu, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($cu, CURLOPT_CONNECTTIMEOUT, 20);
curl_setopt($cu, CURLOPT_TIMEOUT, 30);
curl_setopt($cu, CURLOPT_INTERFACE, "tun0");
$result = curl_exec($cu);;
curl_close($cu);
echo $result . PHP_EOL;
Output:
<!doctype html>
<html>
<head>
<title>Example Domain</title>
<meta charset="utf-8" />
<meta http-equiv="Content-type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<style type="text/css">
body
background-color: #f0f0f2;
margin: 0;
padding: 0;
font-family: "Open Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
div
width: 600px;
margin: 5em auto;
padding: 50px;
background-color: #fff;
border-radius: 1em;
a:link, a:visited
color: #38488f;
text-decoration: none;
@media (max-width: 700px)
body
background-color: #fff;
div
width: auto;
margin: 0 auto;
border-radius: 0;
padding: 1em;
</style>
</head>
<body>
<div>
<h1>Example Domain</h1>
<p>This domain is established to be used for illustrative examples in documents. You may use this
domain in examples without prior coordination or asking for permission.</p>
<p><a href="http://www.iana.org/domains/example">More information...</a></p>
</div>
</body>
</html>
http go vpn network-interface
asked Mar 21 at 15:51
edwveeedwvee
162
I have to make http requests through VPN. There is php code using cURL making what I need, nothing additional:
curl_setopt($cu, CURLOPT_INTERFACE, "tun0");
This interface from ifconfig:
tun0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1500
inet 10.13.13.2 netmask 255.255.255.255 destination 10.13.13.1
inet6 fe80::80ee:132:d102:a52d prefixlen 64 scopeid 0x20<link>
unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 100 (UNSPEC)
My go code (as I understand, I should bind to ip of tun0):
package main
import (
"io/ioutil"
"log"
"net"
"net/http"
"time"
)
func main()
httpTransport := &http.Transport
ief, err := net.InterfaceByName("tun0")
if err != nil
log.Fatal(err)
addrs, err := ief.Addrs()
if err != nil
log.Fatal(err)
tcpAddr := &net.TCPAddrIP: addrs[0].(*net.IPNet).IP
println(tcpAddr.String())
httpTransport.Dial = (&net.Dialer
Timeout: 20 * time.Second,
LocalAddr: tcpAddr,
).Dial
c := &http.Client
Transport: httpTransport,
Timeout: 30 * time.Second,
req, err := http.NewRequest(
http.MethodGet,
"http://example.com/",
nil,
)
if err != nil
log.Fatal(err)
resp, err := c.Do(req)
if err != nil
log.Fatal(err)
bytes, err := ioutil.ReadAll(resp.Body)
if err != nil
log.Fatal(err)
println(string(bytes))
So what I get :
10.13.13.2:0
2019/03/21 15:29:42 Get http://example.com/: dial tcp 10.13.13.2:0->93.184.216.34:80: i/o timeout
exit status 1
Php code with cUrl gets this page fast. I tried many times with Go code, so timeouts can do nothing. Any ideas how to replace that one PHP string in Go?
UPDATE
PHP code getting same page via tun0 and it's output:
<?php
$cu = curl_init();
curl_setopt($cu, CURLOPT_URL, "http://example.com");
curl_setopt($cu, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($cu, CURLOPT_CONNECTTIMEOUT, 20);
curl_setopt($cu, CURLOPT_TIMEOUT, 30);
curl_setopt($cu, CURLOPT_INTERFACE, "tun0");
$result = curl_exec($cu);;
curl_close($cu);
echo $result . PHP_EOL;
Output:
<!doctype html>
<html>
<head>
<title>Example Domain</title>
<meta charset="utf-8" />
<meta http-equiv="Content-type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<style type="text/css">
body
background-color: #f0f0f2;
margin: 0;
padding: 0;
font-family: "Open Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
div
width: 600px;
margin: 5em auto;
padding: 50px;
background-color: #fff;
border-radius: 1em;
a:link, a:visited
color: #38488f;
text-decoration: none;
@media (max-width: 700px)
body
background-color: #fff;
div
width: auto;
margin: 0 auto;
border-radius: 0;
padding: 1em;
</style>
</head>
<body>
<div>
<h1>Example Domain</h1>
<p>This domain is established to be used for illustrative examples in documents. You may use this
domain in examples without prior coordination or asking for permission.</p>
<p><a href="http://www.iana.org/domains/example">More information...</a></p>
</div>
</body>
</html>
http go vpn network-interface
http go vpn network-interface
asked Mar 21 at 15:51
edwveeedwvee
162
asked Mar 21 at 15:51
edwveeedwvee
162
edited Mar 22 at 20:50
edwvee
asked Mar 21 at 15:51
edwveeedwvee
162
asked Mar 21 at 15:51
edwveeedwvee
162
asked Mar 21 at 15:51
edwveeedwvee
162
162
Is your vpn connected to internet ?
– user801247
Mar 21 at 22:04
Ofcourse. As I said, same thing with PHP and cURL works fine.
– edwvee
Mar 22 at 13:06
add a comment |
Is your vpn connected to internet ?
– user801247
Mar 21 at 22:04
Ofcourse. As I said, same thing with PHP and cURL works fine.
– edwvee
Mar 22 at 13:06
Is your vpn connected to internet ?
– user801247
Mar 21 at 22:04
Is your vpn connected to internet ?
– user801247
Mar 21 at 22:04
Ofcourse. As I said, same thing with PHP and cURL works fine.
– edwvee
Mar 22 at 13:06
Ofcourse. As I said, same thing with PHP and cURL works fine.
– edwvee
Mar 22 at 13:06
add a comment |
1 Answer
1
active
oldest
votes
I have a working example:
package main
import (
"fmt"
"io/ioutil"
"net"
"net/http"
)
func main()
ifname := "tun0"
iface, err := net.InterfaceByName(ifname)
if err != nil
panic(fmt.Sprintf("could not get interface: %s", err))
addrs, err := iface.Addrs()
if err != nil
panic(fmt.Sprintf("could not get addresses from interface: %s", err))
fmt.Printf("%+vn", addrs)
c := &http.Client
Transport: &http.Transport
Dial: (&net.Dialer
LocalAddr: &net.TCPAddr
IP: addrs[0].(*net.IPNet).IP,
//IP: net.ParseIP("192.168.0.2"),
//IP: net.ParseIP("127.0.0.1"),
,
).Dial,
,
r, err := c.Get("http://localhost/ip")
if err != nil
panic(fmt.Sprintf("couldn't get http:%s", err))
b, err := ioutil.ReadAll(r.Body)
if err != nil
panic(fmt.Sprintf("could not read body:%s", err))
fmt.Printf("%s", b)
You can see in the LocalAddrcommented different addresses for my tests in my environment.
I used a local running httpbin and I can see this:
$ go run main.go
[myipv6 myipv4]
"origin":"192.168.0.2"
Here, the 2nd line of output is the response from the server.
If I change a bit the code to force 127.0.0.1 (as commented), I get this:
$ go run main.go
[myipv6 myipv4]
"origin":"127.0.0.1"
Which means, the server does indeed see a different source address.
I think, your code works but as you see in the output you have an I/O timeout.
The cause of this might be because your VPN connection is not allowed to connect to your destination. The program seems to do the right connection you asked it, the message dial tcp 10.13.13.2:0->93.184.216.34:80 which is correct according you your ifconfig output.
Also, if I especially connect to a closed port I get this:
panic: couldn't get http:Get http://localhost:81/ip: dial tcp 192.168.0.2:0->127.0.0.1:81: connect: connection refused
Which shows that your addresses are correct.
answered Mar 22 at 0:22
user801247user801247
1,06279
You've just replaced thing about preparing request and client.Do with client.Get. So, it doesn't work either - same result. I added php code getting example.com via tun0 and it's out. It's what I expect from Go code I'm trying to write.
– edwvee
Mar 22 at 20:46
Yes , the code is basically the same as yours and I expected the same result. You should probably sniff the traffic with tcpdump to see what happens. I kind of doubt it's a bug in golang.
– user801247
Mar 22 at 20:47
Sniffing the traffic will allow you to see what going on, what are the differences between golang and php + curl.
– user801247
Mar 22 at 20:49
Or you can try to connect elsewhere, starting with, if possible, on the vpn endpoint itself, see if the error message changes.
– user801247
Mar 22 at 20:54
add a comment |
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1 Answer
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1 Answer
1
active
oldest
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active
oldest
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active
oldest
votes
I have a working example:
package main
import (
"fmt"
"io/ioutil"
"net"
"net/http"
)
func main()
ifname := "tun0"
iface, err := net.InterfaceByName(ifname)
if err != nil
panic(fmt.Sprintf("could not get interface: %s", err))
addrs, err := iface.Addrs()
if err != nil
panic(fmt.Sprintf("could not get addresses from interface: %s", err))
fmt.Printf("%+vn", addrs)
c := &http.Client
Transport: &http.Transport
Dial: (&net.Dialer
LocalAddr: &net.TCPAddr
IP: addrs[0].(*net.IPNet).IP,
//IP: net.ParseIP("192.168.0.2"),
//IP: net.ParseIP("127.0.0.1"),
,
).Dial,
,
r, err := c.Get("http://localhost/ip")
if err != nil
panic(fmt.Sprintf("couldn't get http:%s", err))
b, err := ioutil.ReadAll(r.Body)
if err != nil
panic(fmt.Sprintf("could not read body:%s", err))
fmt.Printf("%s", b)
You can see in the LocalAddrcommented different addresses for my tests in my environment.
I used a local running httpbin and I can see this:
$ go run main.go
[myipv6 myipv4]
"origin":"192.168.0.2"
Here, the 2nd line of output is the response from the server.
If I change a bit the code to force 127.0.0.1 (as commented), I get this:
$ go run main.go
[myipv6 myipv4]
"origin":"127.0.0.1"
Which means, the server does indeed see a different source address.
I think, your code works but as you see in the output you have an I/O timeout.
The cause of this might be because your VPN connection is not allowed to connect to your destination. The program seems to do the right connection you asked it, the message dial tcp 10.13.13.2:0->93.184.216.34:80 which is correct according you your ifconfig output.
Also, if I especially connect to a closed port I get this:
panic: couldn't get http:Get http://localhost:81/ip: dial tcp 192.168.0.2:0->127.0.0.1:81: connect: connection refused
Which shows that your addresses are correct.
answered Mar 22 at 0:22
user801247user801247
1,06279
You've just replaced thing about preparing request and client.Do with client.Get. So, it doesn't work either - same result. I added php code getting example.com via tun0 and it's out. It's what I expect from Go code I'm trying to write.
– edwvee
Mar 22 at 20:46
Yes , the code is basically the same as yours and I expected the same result. You should probably sniff the traffic with tcpdump to see what happens. I kind of doubt it's a bug in golang.
– user801247
Mar 22 at 20:47
Sniffing the traffic will allow you to see what going on, what are the differences between golang and php + curl.
– user801247
Mar 22 at 20:49
Or you can try to connect elsewhere, starting with, if possible, on the vpn endpoint itself, see if the error message changes.
– user801247
Mar 22 at 20:54
add a comment |
I have a working example:
package main
import (
"fmt"
"io/ioutil"
"net"
"net/http"
)
func main()
ifname := "tun0"
iface, err := net.InterfaceByName(ifname)
if err != nil
panic(fmt.Sprintf("could not get interface: %s", err))
addrs, err := iface.Addrs()
if err != nil
panic(fmt.Sprintf("could not get addresses from interface: %s", err))
fmt.Printf("%+vn", addrs)
c := &http.Client
Transport: &http.Transport
Dial: (&net.Dialer
LocalAddr: &net.TCPAddr
IP: addrs[0].(*net.IPNet).IP,
//IP: net.ParseIP("192.168.0.2"),
//IP: net.ParseIP("127.0.0.1"),
,
).Dial,
,
r, err := c.Get("http://localhost/ip")
if err != nil
panic(fmt.Sprintf("couldn't get http:%s", err))
b, err := ioutil.ReadAll(r.Body)
if err != nil
panic(fmt.Sprintf("could not read body:%s", err))
fmt.Printf("%s", b)
You can see in the LocalAddrcommented different addresses for my tests in my environment.
I used a local running httpbin and I can see this:
$ go run main.go
[myipv6 myipv4]
"origin":"192.168.0.2"
Here, the 2nd line of output is the response from the server.
If I change a bit the code to force 127.0.0.1 (as commented), I get this:
$ go run main.go
[myipv6 myipv4]
"origin":"127.0.0.1"
Which means, the server does indeed see a different source address.
I think, your code works but as you see in the output you have an I/O timeout.
The cause of this might be because your VPN connection is not allowed to connect to your destination. The program seems to do the right connection you asked it, the message dial tcp 10.13.13.2:0->93.184.216.34:80 which is correct according you your ifconfig output.
Also, if I especially connect to a closed port I get this:
panic: couldn't get http:Get http://localhost:81/ip: dial tcp 192.168.0.2:0->127.0.0.1:81: connect: connection refused
Which shows that your addresses are correct.
answered Mar 22 at 0:22
user801247user801247
1,06279
You've just replaced thing about preparing request and client.Do with client.Get. So, it doesn't work either - same result. I added php code getting example.com via tun0 and it's out. It's what I expect from Go code I'm trying to write.
– edwvee
Mar 22 at 20:46
Yes , the code is basically the same as yours and I expected the same result. You should probably sniff the traffic with tcpdump to see what happens. I kind of doubt it's a bug in golang.
– user801247
Mar 22 at 20:47
Sniffing the traffic will allow you to see what going on, what are the differences between golang and php + curl.
– user801247
Mar 22 at 20:49
Or you can try to connect elsewhere, starting with, if possible, on the vpn endpoint itself, see if the error message changes.
– user801247
Mar 22 at 20:54
add a comment |
I have a working example:
package main
import (
"fmt"
"io/ioutil"
"net"
"net/http"
)
func main()
ifname := "tun0"
iface, err := net.InterfaceByName(ifname)
if err != nil
panic(fmt.Sprintf("could not get interface: %s", err))
addrs, err := iface.Addrs()
if err != nil
panic(fmt.Sprintf("could not get addresses from interface: %s", err))
fmt.Printf("%+vn", addrs)
c := &http.Client
Transport: &http.Transport
Dial: (&net.Dialer
LocalAddr: &net.TCPAddr
IP: addrs[0].(*net.IPNet).IP,
//IP: net.ParseIP("192.168.0.2"),
//IP: net.ParseIP("127.0.0.1"),
,
).Dial,
,
r, err := c.Get("http://localhost/ip")
if err != nil
panic(fmt.Sprintf("couldn't get http:%s", err))
b, err := ioutil.ReadAll(r.Body)
if err != nil
panic(fmt.Sprintf("could not read body:%s", err))
fmt.Printf("%s", b)
You can see in the LocalAddrcommented different addresses for my tests in my environment.
I used a local running httpbin and I can see this:
$ go run main.go
[myipv6 myipv4]
"origin":"192.168.0.2"
Here, the 2nd line of output is the response from the server.
If I change a bit the code to force 127.0.0.1 (as commented), I get this:
$ go run main.go
[myipv6 myipv4]
"origin":"127.0.0.1"
Which means, the server does indeed see a different source address.
I think, your code works but as you see in the output you have an I/O timeout.
The cause of this might be because your VPN connection is not allowed to connect to your destination. The program seems to do the right connection you asked it, the message dial tcp 10.13.13.2:0->93.184.216.34:80 which is correct according you your ifconfig output.
Also, if I especially connect to a closed port I get this:
panic: couldn't get http:Get http://localhost:81/ip: dial tcp 192.168.0.2:0->127.0.0.1:81: connect: connection refused
Which shows that your addresses are correct.
answered Mar 22 at 0:22
user801247user801247
1,06279
I have a working example:
package main
import (
"fmt"
"io/ioutil"
"net"
"net/http"
)
func main()
ifname := "tun0"
iface, err := net.InterfaceByName(ifname)
if err != nil
panic(fmt.Sprintf("could not get interface: %s", err))
addrs, err := iface.Addrs()
if err != nil
panic(fmt.Sprintf("could not get addresses from interface: %s", err))
fmt.Printf("%+vn", addrs)
c := &http.Client
Transport: &http.Transport
Dial: (&net.Dialer
LocalAddr: &net.TCPAddr
IP: addrs[0].(*net.IPNet).IP,
//IP: net.ParseIP("192.168.0.2"),
//IP: net.ParseIP("127.0.0.1"),
,
).Dial,
,
r, err := c.Get("http://localhost/ip")
if err != nil
panic(fmt.Sprintf("couldn't get http:%s", err))
b, err := ioutil.ReadAll(r.Body)
if err != nil
panic(fmt.Sprintf("could not read body:%s", err))
fmt.Printf("%s", b)
You can see in the LocalAddrcommented different addresses for my tests in my environment.
I used a local running httpbin and I can see this:
$ go run main.go
[myipv6 myipv4]
"origin":"192.168.0.2"
Here, the 2nd line of output is the response from the server.
If I change a bit the code to force 127.0.0.1 (as commented), I get this:
$ go run main.go
[myipv6 myipv4]
"origin":"127.0.0.1"
Which means, the server does indeed see a different source address.
I think, your code works but as you see in the output you have an I/O timeout.
The cause of this might be because your VPN connection is not allowed to connect to your destination. The program seems to do the right connection you asked it, the message dial tcp 10.13.13.2:0->93.184.216.34:80 which is correct according you your ifconfig output.
Also, if I especially connect to a closed port I get this:
panic: couldn't get http:Get http://localhost:81/ip: dial tcp 192.168.0.2:0->127.0.0.1:81: connect: connection refused
Which shows that your addresses are correct.
answered Mar 22 at 0:22
user801247user801247
1,06279
edited Mar 22 at 0:30
answered Mar 22 at 0:22
user801247user801247
1,06279
answered Mar 22 at 0:22
user801247user801247
1,06279
answered Mar 22 at 0:22
user801247user801247
1,06279
1,06279
You've just replaced thing about preparing request and client.Do with client.Get. So, it doesn't work either - same result. I added php code getting example.com via tun0 and it's out. It's what I expect from Go code I'm trying to write.
– edwvee
Mar 22 at 20:46
Yes , the code is basically the same as yours and I expected the same result. You should probably sniff the traffic with tcpdump to see what happens. I kind of doubt it's a bug in golang.
– user801247
Mar 22 at 20:47
Sniffing the traffic will allow you to see what going on, what are the differences between golang and php + curl.
– user801247
Mar 22 at 20:49
Or you can try to connect elsewhere, starting with, if possible, on the vpn endpoint itself, see if the error message changes.
– user801247
Mar 22 at 20:54
add a comment |
You've just replaced thing about preparing request and client.Do with client.Get. So, it doesn't work either - same result. I added php code getting example.com via tun0 and it's out. It's what I expect from Go code I'm trying to write.
– edwvee
Mar 22 at 20:46
Yes , the code is basically the same as yours and I expected the same result. You should probably sniff the traffic with tcpdump to see what happens. I kind of doubt it's a bug in golang.
– user801247
Mar 22 at 20:47
Sniffing the traffic will allow you to see what going on, what are the differences between golang and php + curl.
– user801247
Mar 22 at 20:49
Or you can try to connect elsewhere, starting with, if possible, on the vpn endpoint itself, see if the error message changes.
– user801247
Mar 22 at 20:54
You've just replaced thing about preparing request and client.Do with client.Get. So, it doesn't work either - same result. I added php code getting example.com via tun0 and it's out. It's what I expect from Go code I'm trying to write.
– edwvee
Mar 22 at 20:46
You've just replaced thing about preparing request and client.Do with client.Get. So, it doesn't work either - same result. I added php code getting example.com via tun0 and it's out. It's what I expect from Go code I'm trying to write.
– edwvee
Mar 22 at 20:46
Yes , the code is basically the same as yours and I expected the same result. You should probably sniff the traffic with tcpdump to see what happens. I kind of doubt it's a bug in golang.
– user801247
Mar 22 at 20:47
Yes , the code is basically the same as yours and I expected the same result. You should probably sniff the traffic with tcpdump to see what happens. I kind of doubt it's a bug in golang.
– user801247
Mar 22 at 20:47
Sniffing the traffic will allow you to see what going on, what are the differences between golang and php + curl.
– user801247
Mar 22 at 20:49
Sniffing the traffic will allow you to see what going on, what are the differences between golang and php + curl.
– user801247
Mar 22 at 20:49
Or you can try to connect elsewhere, starting with, if possible, on the vpn endpoint itself, see if the error message changes.
– user801247
Mar 22 at 20:54
Or you can try to connect elsewhere, starting with, if possible, on the vpn endpoint itself, see if the error message changes.
– user801247
Mar 22 at 20:54
add a comment |
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Is your vpn connected to internet ?
– user801247
Mar 21 at 22:04
Ofcourse. As I said, same thing with PHP and cURL works fine.
– edwvee
Mar 22 at 13:06