Extracting HTTP content in bash doesn't work with nc output
0
Let's say I have this HTTP response:
POST / HTTP/1.1
Content-Type: text/plain;charset=UTF-8
Content-Length: 5
Connection: Keep-Alive
Accept-Encoding: gzip
Accept-Language: en,*
User-Agent: Mozilla/5.0
Host: 127.0.0.1:55764
Hello
And I'm interested only in content ("Hello"). I found this command to work if the text is fed from a file:
cat data.txt | tr 'n' '#' | sed "s/.*##//" | tr '#' 'n'
Hello
where data.txt contains the text above.
But if I try to feed it with the output of nc:
#!/bin/bash
while true
do
echo -e "HTTP/1.1 200 OKnn" | ./busybox-armv7l nc -l -p 55764 | tr 'n' '#' | sed "s/.*##//" | tr '#' 'n'
done
it doesn't work, i.e. it just print out everything:
POST / HTTP/1.1
Content-Type: text/plain;charset=UTF-8
Content-Length: 5
Connection: Keep-Alive
Accept-Encoding: gzip
Accept-Language: en,*
User-Agent: Mozilla/5.0
Host: 127.0.0.1:55764
HelloPOST / HTTP/1.1
Content-Type: text/plain;charset=UTF-8
Content-Length: 5
Connection: Keep-Alive
Accept-Encoding: gzip
Accept-Language: en,*
User-Agent: Mozilla/5.0
Host: 127.0.0.1:55764
Hello
Why the piping works with cat but not with nc?
bash http pipe netcat busybox
edited Nov 18 '18 at 8:38
Cyrus
45.3k43676
asked Nov 18 '18 at 8:28
MarkMark
1,07311432
add a comment |
0
Let's say I have this HTTP response:
POST / HTTP/1.1
Content-Type: text/plain;charset=UTF-8
Content-Length: 5
Connection: Keep-Alive
Accept-Encoding: gzip
Accept-Language: en,*
User-Agent: Mozilla/5.0
Host: 127.0.0.1:55764
Hello
And I'm interested only in content ("Hello"). I found this command to work if the text is fed from a file:
cat data.txt | tr 'n' '#' | sed "s/.*##//" | tr '#' 'n'
Hello
where data.txt contains the text above.
But if I try to feed it with the output of nc:
#!/bin/bash
while true
do
echo -e "HTTP/1.1 200 OKnn" | ./busybox-armv7l nc -l -p 55764 | tr 'n' '#' | sed "s/.*##//" | tr '#' 'n'
done
it doesn't work, i.e. it just print out everything:
POST / HTTP/1.1
Content-Type: text/plain;charset=UTF-8
Content-Length: 5
Connection: Keep-Alive
Accept-Encoding: gzip
Accept-Language: en,*
User-Agent: Mozilla/5.0
Host: 127.0.0.1:55764
HelloPOST / HTTP/1.1
Content-Type: text/plain;charset=UTF-8
Content-Length: 5
Connection: Keep-Alive
Accept-Encoding: gzip
Accept-Language: en,*
User-Agent: Mozilla/5.0
Host: 127.0.0.1:55764
Hello
Why the piping works with cat but not with nc?
bash http pipe netcat busybox
edited Nov 18 '18 at 8:38
Cyrus
45.3k43676
asked Nov 18 '18 at 8:28
MarkMark
1,07311432
add a comment |
0
0
0
Let's say I have this HTTP response:
POST / HTTP/1.1
Content-Type: text/plain;charset=UTF-8
Content-Length: 5
Connection: Keep-Alive
Accept-Encoding: gzip
Accept-Language: en,*
User-Agent: Mozilla/5.0
Host: 127.0.0.1:55764
Hello
And I'm interested only in content ("Hello"). I found this command to work if the text is fed from a file:
cat data.txt | tr 'n' '#' | sed "s/.*##//" | tr '#' 'n'
Hello
where data.txt contains the text above.
But if I try to feed it with the output of nc:
#!/bin/bash
while true
do
echo -e "HTTP/1.1 200 OKnn" | ./busybox-armv7l nc -l -p 55764 | tr 'n' '#' | sed "s/.*##//" | tr '#' 'n'
done
it doesn't work, i.e. it just print out everything:
POST / HTTP/1.1
Content-Type: text/plain;charset=UTF-8
Content-Length: 5
Connection: Keep-Alive
Accept-Encoding: gzip
Accept-Language: en,*
User-Agent: Mozilla/5.0
Host: 127.0.0.1:55764
HelloPOST / HTTP/1.1
Content-Type: text/plain;charset=UTF-8
Content-Length: 5
Connection: Keep-Alive
Accept-Encoding: gzip
Accept-Language: en,*
User-Agent: Mozilla/5.0
Host: 127.0.0.1:55764
Hello
Why the piping works with cat but not with nc?
bash http pipe netcat busybox
edited Nov 18 '18 at 8:38
Cyrus
45.3k43676
asked Nov 18 '18 at 8:28
MarkMark
1,07311432
Let's say I have this HTTP response:
POST / HTTP/1.1
Content-Type: text/plain;charset=UTF-8
Content-Length: 5
Connection: Keep-Alive
Accept-Encoding: gzip
Accept-Language: en,*
User-Agent: Mozilla/5.0
Host: 127.0.0.1:55764
Hello
And I'm interested only in content ("Hello"). I found this command to work if the text is fed from a file:
cat data.txt | tr 'n' '#' | sed "s/.*##//" | tr '#' 'n'
Hello
where data.txt contains the text above.
But if I try to feed it with the output of nc:
#!/bin/bash
while true
do
echo -e "HTTP/1.1 200 OKnn" | ./busybox-armv7l nc -l -p 55764 | tr 'n' '#' | sed "s/.*##//" | tr '#' 'n'
done
it doesn't work, i.e. it just print out everything:
POST / HTTP/1.1
Content-Type: text/plain;charset=UTF-8
Content-Length: 5
Connection: Keep-Alive
Accept-Encoding: gzip
Accept-Language: en,*
User-Agent: Mozilla/5.0
Host: 127.0.0.1:55764
HelloPOST / HTTP/1.1
Content-Type: text/plain;charset=UTF-8
Content-Length: 5
Connection: Keep-Alive
Accept-Encoding: gzip
Accept-Language: en,*
User-Agent: Mozilla/5.0
Host: 127.0.0.1:55764
Hello
Why the piping works with cat but not with nc?
bash http pipe netcat busybox
bash http pipe netcat busybox
edited Nov 18 '18 at 8:38
Cyrus
45.3k43676
asked Nov 18 '18 at 8:28
MarkMark
1,07311432
edited Nov 18 '18 at 8:38
Cyrus
45.3k43676
asked Nov 18 '18 at 8:28
MarkMark
1,07311432
edited Nov 18 '18 at 8:38
Cyrus
45.3k43676
edited Nov 18 '18 at 8:38
Cyrus
45.3k43676
edited Nov 18 '18 at 8:38
Cyrus
45.3k43676
45.3k43676
asked Nov 18 '18 at 8:28
MarkMark
1,07311432
asked Nov 18 '18 at 8:28
MarkMark
1,07311432
asked Nov 18 '18 at 8:28
MarkMark
1,07311432
1,07311432
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
1
output of nc goes to stderr just add & after second | to make the pipe effective:
echo -e "HTTP/1.1 200 OKnn" | ./busybox-armv7l nc -l -p 55764 |& tr 'n' '#' | sed "s/.*##//" | tr '#' 'n
answered Nov 18 '18 at 8:49
gopygopy
1637
Unfortunately it doesn't work for me. It still prints out all the stuff.
– Mark
Nov 18 '18 at 9:01
Can you please tell me your bash version?bash --version
– gopy
Nov 18 '18 at 9:13
and why you are using busybox?
– gopy
Nov 18 '18 at 9:14
GNU bash, version 4.3.0(1)-release (arm-poky-linux-gnueabi). I'm using busybox because it's an embedded device and I have a limited set of commands only.
– Mark
Nov 18 '18 at 9:15
1
I tested the solution, this works for me, the only difference is that I used busybox instead of ./busybox-armv7l . I can't guess your problem. be sure that your input(http request) doesn't contain 'rn' s
– gopy
Nov 18 '18 at 9:49
|
show 4 more comments
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1 Answer
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1 Answer
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oldest
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oldest
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oldest
votes
1
output of nc goes to stderr just add & after second | to make the pipe effective:
echo -e "HTTP/1.1 200 OKnn" | ./busybox-armv7l nc -l -p 55764 |& tr 'n' '#' | sed "s/.*##//" | tr '#' 'n
answered Nov 18 '18 at 8:49
gopygopy
1637
Unfortunately it doesn't work for me. It still prints out all the stuff.
– Mark
Nov 18 '18 at 9:01
Can you please tell me your bash version?bash --version
– gopy
Nov 18 '18 at 9:13
and why you are using busybox?
– gopy
Nov 18 '18 at 9:14
GNU bash, version 4.3.0(1)-release (arm-poky-linux-gnueabi). I'm using busybox because it's an embedded device and I have a limited set of commands only.
– Mark
Nov 18 '18 at 9:15
1
I tested the solution, this works for me, the only difference is that I used busybox instead of ./busybox-armv7l . I can't guess your problem. be sure that your input(http request) doesn't contain 'rn' s
– gopy
Nov 18 '18 at 9:49
|
show 4 more comments
1
output of nc goes to stderr just add & after second | to make the pipe effective:
echo -e "HTTP/1.1 200 OKnn" | ./busybox-armv7l nc -l -p 55764 |& tr 'n' '#' | sed "s/.*##//" | tr '#' 'n
answered Nov 18 '18 at 8:49
gopygopy
1637
Unfortunately it doesn't work for me. It still prints out all the stuff.
– Mark
Nov 18 '18 at 9:01
Can you please tell me your bash version?bash --version
– gopy
Nov 18 '18 at 9:13
and why you are using busybox?
– gopy
Nov 18 '18 at 9:14
GNU bash, version 4.3.0(1)-release (arm-poky-linux-gnueabi). I'm using busybox because it's an embedded device and I have a limited set of commands only.
– Mark
Nov 18 '18 at 9:15
1
I tested the solution, this works for me, the only difference is that I used busybox instead of ./busybox-armv7l . I can't guess your problem. be sure that your input(http request) doesn't contain 'rn' s
– gopy
Nov 18 '18 at 9:49
|
show 4 more comments
1
1
1
output of nc goes to stderr just add & after second | to make the pipe effective:
echo -e "HTTP/1.1 200 OKnn" | ./busybox-armv7l nc -l -p 55764 |& tr 'n' '#' | sed "s/.*##//" | tr '#' 'n
answered Nov 18 '18 at 8:49
gopygopy
1637
output of nc goes to stderr just add & after second | to make the pipe effective:
echo -e "HTTP/1.1 200 OKnn" | ./busybox-armv7l nc -l -p 55764 |& tr 'n' '#' | sed "s/.*##//" | tr '#' 'n
answered Nov 18 '18 at 8:49
gopygopy
1637
answered Nov 18 '18 at 8:49
gopygopy
1637
answered Nov 18 '18 at 8:49
gopygopy
1637
answered Nov 18 '18 at 8:49
gopygopy
1637
1637
Unfortunately it doesn't work for me. It still prints out all the stuff.
– Mark
Nov 18 '18 at 9:01
Can you please tell me your bash version?bash --version
– gopy
Nov 18 '18 at 9:13
and why you are using busybox?
– gopy
Nov 18 '18 at 9:14
GNU bash, version 4.3.0(1)-release (arm-poky-linux-gnueabi). I'm using busybox because it's an embedded device and I have a limited set of commands only.
– Mark
Nov 18 '18 at 9:15
1
I tested the solution, this works for me, the only difference is that I used busybox instead of ./busybox-armv7l . I can't guess your problem. be sure that your input(http request) doesn't contain 'rn' s
– gopy
Nov 18 '18 at 9:49
|
show 4 more comments
Unfortunately it doesn't work for me. It still prints out all the stuff.
– Mark
Nov 18 '18 at 9:01
Can you please tell me your bash version?bash --version
– gopy
Nov 18 '18 at 9:13
and why you are using busybox?
– gopy
Nov 18 '18 at 9:14
GNU bash, version 4.3.0(1)-release (arm-poky-linux-gnueabi). I'm using busybox because it's an embedded device and I have a limited set of commands only.
– Mark
Nov 18 '18 at 9:15
1
I tested the solution, this works for me, the only difference is that I used busybox instead of ./busybox-armv7l . I can't guess your problem. be sure that your input(http request) doesn't contain 'rn' s
– gopy
Nov 18 '18 at 9:49
Unfortunately it doesn't work for me. It still prints out all the stuff.
– Mark
Nov 18 '18 at 9:01
Unfortunately it doesn't work for me. It still prints out all the stuff.
– Mark
Nov 18 '18 at 9:01
Can you please tell me your bash version?
bash --version– gopy
Nov 18 '18 at 9:13
Can you please tell me your bash version?
bash --version– gopy
Nov 18 '18 at 9:13
and why you are using busybox?
– gopy
Nov 18 '18 at 9:14
and why you are using busybox?
– gopy
Nov 18 '18 at 9:14
GNU bash, version 4.3.0(1)-release (arm-poky-linux-gnueabi). I'm using busybox because it's an embedded device and I have a limited set of commands only.– Mark
Nov 18 '18 at 9:15
GNU bash, version 4.3.0(1)-release (arm-poky-linux-gnueabi). I'm using busybox because it's an embedded device and I have a limited set of commands only.– Mark
Nov 18 '18 at 9:15
1
1
I tested the solution, this works for me, the only difference is that I used busybox instead of ./busybox-armv7l . I can't guess your problem. be sure that your input(http request) doesn't contain 'rn' s
– gopy
Nov 18 '18 at 9:49
I tested the solution, this works for me, the only difference is that I used busybox instead of ./busybox-armv7l . I can't guess your problem. be sure that your input(http request) doesn't contain 'rn' s
– gopy
Nov 18 '18 at 9:49
|
show 4 more comments
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