Get HTTP header response with telnet in shell script using a proxy
Clash Royale CLAN TAG#URR8PPP
I need to get the http header response from a server (google) with telnet, as i don't have curl or wget in my busybox environment. Also, I'm behind a proxy.
So on the command line I can successfully do this:
$ telnet proxy.ip port
HEAD http://www.google.com/ HTTP/1.1
hit enter twice
HTTP/1.1 200 OK
Date: Tue, 15 Jan 2019 09:11:28 GMT
Expires: -1
Cache-Control: private, max-age=0
Content-Type: text/html; charset=ISO-8859-1
P3P: CP="This is not a P3P policy! See g.co/p3phelp for more info."
Server: gws
X-XSS-Protection: 1; mode=block
X-Frame-Options: SAMEORIGIN
entire header follows...
But I dont know how to put this into a shell script.
This is what I tried:
#!/bin/sh
(
echo "GET http://www.google.com/ HTTP/1.1"
echo
echo
echo "exit"
) | telnet proxy.ip port
But it doesnt give me any output at all.
shell-script http telnet
edited Jan 15 at 9:50
Rui F Ribeiro
39.8k1479132
asked Jan 15 at 9:15
tzippytzippy
15116
add a comment |
I need to get the http header response from a server (google) with telnet, as i don't have curl or wget in my busybox environment. Also, I'm behind a proxy.
So on the command line I can successfully do this:
$ telnet proxy.ip port
HEAD http://www.google.com/ HTTP/1.1
hit enter twice
HTTP/1.1 200 OK
Date: Tue, 15 Jan 2019 09:11:28 GMT
Expires: -1
Cache-Control: private, max-age=0
Content-Type: text/html; charset=ISO-8859-1
P3P: CP="This is not a P3P policy! See g.co/p3phelp for more info."
Server: gws
X-XSS-Protection: 1; mode=block
X-Frame-Options: SAMEORIGIN
entire header follows...
But I dont know how to put this into a shell script.
This is what I tried:
#!/bin/sh
(
echo "GET http://www.google.com/ HTTP/1.1"
echo
echo
echo "exit"
) | telnet proxy.ip port
But it doesnt give me any output at all.
shell-script http telnet
edited Jan 15 at 9:50
Rui F Ribeiro
39.8k1479132
asked Jan 15 at 9:15
tzippytzippy
15116
1
I don't know iftelnetwill read input from a pipe. Do you havenc(netcat)? The manpage contains this example:$ echo -n "GET / HTTP/1.0rnrn" | nc host.example.com 80
– Bodo
Jan 15 at 9:22
I do have netcat, but how would I use the proxy with it?=
– tzippy
Jan 15 at 9:23
1
Replacenc host.example.com 80withnc proxy.ip portin the example from the manpage.
– Bodo
Jan 15 at 9:42
add a comment |
I need to get the http header response from a server (google) with telnet, as i don't have curl or wget in my busybox environment. Also, I'm behind a proxy.
So on the command line I can successfully do this:
$ telnet proxy.ip port
HEAD http://www.google.com/ HTTP/1.1
hit enter twice
HTTP/1.1 200 OK
Date: Tue, 15 Jan 2019 09:11:28 GMT
Expires: -1
Cache-Control: private, max-age=0
Content-Type: text/html; charset=ISO-8859-1
P3P: CP="This is not a P3P policy! See g.co/p3phelp for more info."
Server: gws
X-XSS-Protection: 1; mode=block
X-Frame-Options: SAMEORIGIN
entire header follows...
But I dont know how to put this into a shell script.
This is what I tried:
#!/bin/sh
(
echo "GET http://www.google.com/ HTTP/1.1"
echo
echo
echo "exit"
) | telnet proxy.ip port
But it doesnt give me any output at all.
shell-script http telnet
edited Jan 15 at 9:50
Rui F Ribeiro
39.8k1479132
asked Jan 15 at 9:15
tzippytzippy
15116
I need to get the http header response from a server (google) with telnet, as i don't have curl or wget in my busybox environment. Also, I'm behind a proxy.
So on the command line I can successfully do this:
$ telnet proxy.ip port
HEAD http://www.google.com/ HTTP/1.1
hit enter twice
HTTP/1.1 200 OK
Date: Tue, 15 Jan 2019 09:11:28 GMT
Expires: -1
Cache-Control: private, max-age=0
Content-Type: text/html; charset=ISO-8859-1
P3P: CP="This is not a P3P policy! See g.co/p3phelp for more info."
Server: gws
X-XSS-Protection: 1; mode=block
X-Frame-Options: SAMEORIGIN
entire header follows...
But I dont know how to put this into a shell script.
This is what I tried:
#!/bin/sh
(
echo "GET http://www.google.com/ HTTP/1.1"
echo
echo
echo "exit"
) | telnet proxy.ip port
But it doesnt give me any output at all.
shell-script http telnet
shell-script http telnet
edited Jan 15 at 9:50
Rui F Ribeiro
39.8k1479132
asked Jan 15 at 9:15
tzippytzippy
15116
edited Jan 15 at 9:50
Rui F Ribeiro
39.8k1479132
asked Jan 15 at 9:15
tzippytzippy
15116
edited Jan 15 at 9:50
Rui F Ribeiro
39.8k1479132
edited Jan 15 at 9:50
Rui F Ribeiro
39.8k1479132
edited Jan 15 at 9:50
Rui F Ribeiro
39.8k1479132
39.8k1479132
asked Jan 15 at 9:15
tzippytzippy
15116
asked Jan 15 at 9:15
tzippytzippy
15116
asked Jan 15 at 9:15
tzippytzippy
15116
15116
1
I don't know iftelnetwill read input from a pipe. Do you havenc(netcat)? The manpage contains this example:$ echo -n "GET / HTTP/1.0rnrn" | nc host.example.com 80
– Bodo
Jan 15 at 9:22
I do have netcat, but how would I use the proxy with it?=
– tzippy
Jan 15 at 9:23
1
Replacenc host.example.com 80withnc proxy.ip portin the example from the manpage.
– Bodo
Jan 15 at 9:42
add a comment |
1
I don't know iftelnetwill read input from a pipe. Do you havenc(netcat)? The manpage contains this example:$ echo -n "GET / HTTP/1.0rnrn" | nc host.example.com 80
– Bodo
Jan 15 at 9:22
I do have netcat, but how would I use the proxy with it?=
– tzippy
Jan 15 at 9:23
1
Replacenc host.example.com 80withnc proxy.ip portin the example from the manpage.
– Bodo
Jan 15 at 9:42
1
1
I don't know if
telnet will read input from a pipe. Do you have nc (netcat)? The manpage contains this example: $ echo -n "GET / HTTP/1.0rnrn" | nc host.example.com 80– Bodo
Jan 15 at 9:22
I don't know if
telnet will read input from a pipe. Do you have nc (netcat)? The manpage contains this example: $ echo -n "GET / HTTP/1.0rnrn" | nc host.example.com 80– Bodo
Jan 15 at 9:22
I do have netcat, but how would I use the proxy with it?=
– tzippy
Jan 15 at 9:23
I do have netcat, but how would I use the proxy with it?=
– tzippy
Jan 15 at 9:23
1
1
Replace
nc host.example.com 80 with nc proxy.ip port in the example from the manpage.– Bodo
Jan 15 at 9:42
Replace
nc host.example.com 80 with nc proxy.ip port in the example from the manpage.– Bodo
Jan 15 at 9:42
add a comment |
1 Answer
1
active
oldest
votes
If you want to control the input and the output streams you could do this:
#!/usr/bin/env bash
proxy_host="example.proxy.local"
proxy_port="8080"
uri="http://www.google.com/"
# This is the STDIN for telnet, keep in mind that this needs to be running
# as long as the request is handled. You can test the result by removing the
# sleep.
send_headers ()
# Note the use of HTTP/1.0. 1.1 would keep the connection open
# and you will need to wait for the 10 second timout below.
echo "GET $uri HTTP/1.0"
echo
echo
# 10 second timeout to keep STDIN open
sleep 10
# This reads the telnet output per line, do your stuff here
while read -r line; do
echo "$line"
done < <(telnet "$proxy_host" "$proxy_port" < <(send_headers))
The command1 < <(command2) syntax is just a reversed pipe (same as command2 | command1). In this example it connects the STDOUT file descriptor of command2 to the STDIN file descriptor of command1. The downside of this is that all 'commands' in this pipeline need to be running for it to work. If you remove the sleep, the telnet command is ended prematurely. The good news is that, when you use HTTP/1.0, the connection is closed for you, and the pipe is neatly closed, without waiting for the 10 second send_headers timeout.
NB: I don't have a proxy to test the code so I hope it works for you :)
answered Jan 15 at 10:12
JohanJohan
2565
add a comment |
Your Answer
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "106"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f494558%2fget-http-header-response-with-telnet-in-shell-script-using-a-proxy%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
If you want to control the input and the output streams you could do this:
#!/usr/bin/env bash
proxy_host="example.proxy.local"
proxy_port="8080"
uri="http://www.google.com/"
# This is the STDIN for telnet, keep in mind that this needs to be running
# as long as the request is handled. You can test the result by removing the
# sleep.
send_headers ()
# Note the use of HTTP/1.0. 1.1 would keep the connection open
# and you will need to wait for the 10 second timout below.
echo "GET $uri HTTP/1.0"
echo
echo
# 10 second timeout to keep STDIN open
sleep 10
# This reads the telnet output per line, do your stuff here
while read -r line; do
echo "$line"
done < <(telnet "$proxy_host" "$proxy_port" < <(send_headers))
The command1 < <(command2) syntax is just a reversed pipe (same as command2 | command1). In this example it connects the STDOUT file descriptor of command2 to the STDIN file descriptor of command1. The downside of this is that all 'commands' in this pipeline need to be running for it to work. If you remove the sleep, the telnet command is ended prematurely. The good news is that, when you use HTTP/1.0, the connection is closed for you, and the pipe is neatly closed, without waiting for the 10 second send_headers timeout.
NB: I don't have a proxy to test the code so I hope it works for you :)
answered Jan 15 at 10:12
JohanJohan
2565
add a comment |
If you want to control the input and the output streams you could do this:
#!/usr/bin/env bash
proxy_host="example.proxy.local"
proxy_port="8080"
uri="http://www.google.com/"
# This is the STDIN for telnet, keep in mind that this needs to be running
# as long as the request is handled. You can test the result by removing the
# sleep.
send_headers ()
# Note the use of HTTP/1.0. 1.1 would keep the connection open
# and you will need to wait for the 10 second timout below.
echo "GET $uri HTTP/1.0"
echo
echo
# 10 second timeout to keep STDIN open
sleep 10
# This reads the telnet output per line, do your stuff here
while read -r line; do
echo "$line"
done < <(telnet "$proxy_host" "$proxy_port" < <(send_headers))
The command1 < <(command2) syntax is just a reversed pipe (same as command2 | command1). In this example it connects the STDOUT file descriptor of command2 to the STDIN file descriptor of command1. The downside of this is that all 'commands' in this pipeline need to be running for it to work. If you remove the sleep, the telnet command is ended prematurely. The good news is that, when you use HTTP/1.0, the connection is closed for you, and the pipe is neatly closed, without waiting for the 10 second send_headers timeout.
NB: I don't have a proxy to test the code so I hope it works for you :)
answered Jan 15 at 10:12
JohanJohan
2565
add a comment |
If you want to control the input and the output streams you could do this:
#!/usr/bin/env bash
proxy_host="example.proxy.local"
proxy_port="8080"
uri="http://www.google.com/"
# This is the STDIN for telnet, keep in mind that this needs to be running
# as long as the request is handled. You can test the result by removing the
# sleep.
send_headers ()
# Note the use of HTTP/1.0. 1.1 would keep the connection open
# and you will need to wait for the 10 second timout below.
echo "GET $uri HTTP/1.0"
echo
echo
# 10 second timeout to keep STDIN open
sleep 10
# This reads the telnet output per line, do your stuff here
while read -r line; do
echo "$line"
done < <(telnet "$proxy_host" "$proxy_port" < <(send_headers))
The command1 < <(command2) syntax is just a reversed pipe (same as command2 | command1). In this example it connects the STDOUT file descriptor of command2 to the STDIN file descriptor of command1. The downside of this is that all 'commands' in this pipeline need to be running for it to work. If you remove the sleep, the telnet command is ended prematurely. The good news is that, when you use HTTP/1.0, the connection is closed for you, and the pipe is neatly closed, without waiting for the 10 second send_headers timeout.
NB: I don't have a proxy to test the code so I hope it works for you :)
answered Jan 15 at 10:12
JohanJohan
2565
If you want to control the input and the output streams you could do this:
#!/usr/bin/env bash
proxy_host="example.proxy.local"
proxy_port="8080"
uri="http://www.google.com/"
# This is the STDIN for telnet, keep in mind that this needs to be running
# as long as the request is handled. You can test the result by removing the
# sleep.
send_headers ()
# Note the use of HTTP/1.0. 1.1 would keep the connection open
# and you will need to wait for the 10 second timout below.
echo "GET $uri HTTP/1.0"
echo
echo
# 10 second timeout to keep STDIN open
sleep 10
# This reads the telnet output per line, do your stuff here
while read -r line; do
echo "$line"
done < <(telnet "$proxy_host" "$proxy_port" < <(send_headers))
The command1 < <(command2) syntax is just a reversed pipe (same as command2 | command1). In this example it connects the STDOUT file descriptor of command2 to the STDIN file descriptor of command1. The downside of this is that all 'commands' in this pipeline need to be running for it to work. If you remove the sleep, the telnet command is ended prematurely. The good news is that, when you use HTTP/1.0, the connection is closed for you, and the pipe is neatly closed, without waiting for the 10 second send_headers timeout.
NB: I don't have a proxy to test the code so I hope it works for you :)
answered Jan 15 at 10:12
JohanJohan
2565
edited Jan 15 at 10:30
answered Jan 15 at 10:12
JohanJohan
2565
answered Jan 15 at 10:12
JohanJohan
2565
answered Jan 15 at 10:12
JohanJohan
2565
2565
add a comment |
add a comment |
Thanks for contributing an answer to Unix & Linux Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f494558%2fget-http-header-response-with-telnet-in-shell-script-using-a-proxy%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
1
I don't know if
telnetwill read input from a pipe. Do you havenc(netcat)? The manpage contains this example:$ echo -n "GET / HTTP/1.0rnrn" | nc host.example.com 80– Bodo
Jan 15 at 9:22
I do have netcat, but how would I use the proxy with it?=
– tzippy
Jan 15 at 9:23
1
Replace
nc host.example.com 80withnc proxy.ip portin the example from the manpage.– Bodo
Jan 15 at 9:42