Hi,

I'm writing a simple httpd with php support via cgi/fastcgi. I tried several
ways to pass POST data to php-cgi (by writing to child process's stdin from
parent process), however, none of them worked

Here's the most simple not working example:

$ export CONTENT_LENGTH=4; export HTTP_METHOD=POST; echo 's=33' | php-cgi
test.php

and test.php has only one line:

<?php echo $_POST["s"]; ?>

Running it gave me:

X-Powered-By: PHP/5.2.3-1ubuntu6.3
Content-type: text/html

<br />
<b>Notice</b>: Undefined index: s in <b>/home/chen/temp/test.php</b> on
line <b>1</b><br />

Please me figure out what's missing. Part of php-cgi's phpinfo() output
is attached, I will provide more if you need.

Thanks in advance,
Hui

=========phpinfo() output==========
_SERVER["TERM"]xterm
_SERVER["SHELL"]/bin/bash
_SERVER["SSH_TTY"]/dev/pts/1
_SERVER["CONTENT_LENG"]4
_SERVER["LD_LIBRARY_PATH"]/usr/local/lib
_SERVER["LS_COLORS"]no=00:fi=00:di=01;34:ln=01;36:pi=40;33:so=01;35:do =01;35:bd=40;33;01:cd=40;33;01r=40;31;01:su=37;4 1:sg=30;43:tw=30;42w=34;42:st=37;44:ex=01;32:*.t ar=01;31:*.tgz=01;31:*.arj=01;31:*.taz=01;31:*.lzh =01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.gz=01;31: *.bz2=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*. jpg=01;35:*.jpeg=01;35:*.gif=01;35:*.bmp=01;35:*.p bm=01;35:*..pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xb m=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png =01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.avi= 01;35:*.fli=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;3 5:*..xwd=01;35:*.flac=01;35:*.mp3=01;35:*.mpc=01;3 5:*.ogg=01;35:*.wav=01;35:
_SERVER["LANG"]en_US.UTF-8
_SERVER["HISTCONTROL"]ignoredups
_SERVER["SHLVL"]1
_SERVER["CONTENT_LENGTH"]4
_SERVER["LESSOPEN"]| /usr/bin/lesspipe %s
_SERVER["HTTP_METHOD"]POST
_SERVER["CONTENT_TYPE"]application/x-www-form-urlencoded
_SERVER["LESSCLOSE"]/usr/bin/lesspipe %s %s
_SERVER["_"]/usr/bin/php-cgi
_SERVER["PHP_SELF"]<i>no value</i>
_SERVER["REQUEST_TIME"]1205702297
_SERVER["argv"]</td><td class="v"><pre>Array
(
[0] =&gt; phpinfo.php
)
</pre>

_SERVER["argc"]1
_ENV["TERM"]xterm
_ENV["SHELL"]/bin/bash
_ENV["SSH_TTY"]/dev/pts/1
_ENV["CONTENT_LENG"]4
_ENV["LD_LIBRARY_PATH"]/usr/local/lib
_ENV["LS_COLORS"]no=00:fi=00:di=01;34:ln=01;36:pi=40;33:so=01;35:do =01;35:bd=40;33;01:cd=40;33;01r=40;31;01:su=37;4 1:sg=30;43:tw=30;42w=34;42:st=37;44:ex=01;32:*.t ar=01;31:*.tgz=01;31:*..arj=01;31:*.taz=01;31:*.lz h=01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.gz=01;31 :*.bz2=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:* .jpg=01;35:*.jpeg=01;35:*.gif=01;35:*.bmp=01;35:*. pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xb m=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png =01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.avi= 01;35:*.fli=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;3 5:*.xwd=01;35:*.flac=01;35:*.mp3=01;35:*.mpc=01;35 :*.ogg=01;35:*.wav=01;35:
_ENV["LANG"]en_US.UTF-8
_ENV["HISTCONTROL"]ignoredups
_ENV["SHLVL"]1
_ENV["CONTENT_LENGTH"]4
_ENV["LESSOPEN"]| /usr/bin/lesspipe %s
_ENV["HTTP_METHOD"]POST
_ENV["CONTENT_TYPE"]application/x-www-form-urlencoded
_ENV["LESSCLOSE"]/usr/bin/lesspipe %s %s
_ENV["_"]/usr/bin/php-cgi

I solved the problem myself.

Following command works:

export CONTENT_LENGTH=4; export REQUEST_METHOD=POST; export SCRIPT_FILENAME=
test.php ; export CONTENT_TYPE=application/x-www-form-urlencoded; echo s=44
| php-cgi

output:

X-Powered-By: PHP/5.2.3-1ubuntu6.3
Content-type: text/html

44

a working C fork/exec example is also attached.

=========== test.c ===========

#include <unistd.h>
#include <stdio.h>
#include <string.h>

main()
{
int outfd[2];
int infd[2];
int oldstdin, oldstdout;
pipe(outfd); // Where the parent is going to write to
pipe(infd); // From where parent is going to read
if(!fork())
{
close(0);
close(1);
dup2(outfd[0], 0); // Make the read end of outfd pipe as stdin
dup2(infd[1],1); // Make the write end of infd as stdout
setenv("CONTENT_LENGTH", "4", 1);
setenv("REQUEST_METHOD", "POST", 1);
setenv("SCRIPT_FILENAME", "test.php", 1);
setenv("CONTENT_TYPE", "application/x-www-form-urlencoded", 1);
execl("/usr/bin/php-cgi","/usr/bin/php-cgi", NULL);
}
else
{

char output[1000];
close(outfd[0]); // These are being used by the child
write(outfd[1],"s=444", 5); // Write to child's stdin
close(outfd[1]);
close(infd[1]);
output[read(infd[0],output,1000)] = 0; // Read from child's stdout
printf("%s", output);
}
}


On Sun, Mar 16, 2008 at 4:30 PM, Hui Chen <usa.chen@gmail.com> wrote:

> Hi,
>
> I'm writing a simple httpd with php support via cgi/fastcgi. I tried
> several ways to pass POST data to php-cgi (by writing to child process's
> stdin from parent process), however, none of them worked
>
> Here's the most simple not working example:
>
> $ export CONTENT_LENGTH=4; export HTTP_METHOD=POST; echo 's=33' | php-cgi
> test.php
>
> and test.php has only one line:
>
> <?php echo $_POST["s"]; ?>
>
> Running it gave me:
>
> X-Powered-By: PHP/5.2.3-1ubuntu6.3
> Content-type: text/html
>
> <br />
> <b>Notice</b>: Undefined index: s in <b>/home/chen/temp/test.php</b> on
> line <b>1</b><br />
>
> Please me figure out what's missing. Part of php-cgi's phpinfo()
> output is attached, I will provide more if you need.
>
> Thanks in advance,
> Hui
>
> =========phpinfo() output==========
> _SERVER["TERM"]xterm
> _SERVER["SHELL"]/bin/bash
> _SERVER["SSH_TTY"]/dev/pts/1
> _SERVER["CONTENT_LENG"]4
> _SERVER["LD_LIBRARY_PATH"]/usr/local/lib
>
> _SERVER["LS_COLORS"]no=00:fi=00:di=01;34:ln=01;36:pi=40;33:so=01;35:do =01;35:bd=40;33;01:cd=40;33;01r=40;31;01:su=37;4 1:sg=30;43:tw=30;42w=34;42:st=37;44:ex=01;32:*.t ar=01;31:*.tgz=01;31:*.arj=01;31:*.taz=01;31:*.lzh =01;31:*.zip=01;31:*.z=01;31:*..Z=01;31:*.gz=01;31 :*.bz2=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:* .jpg=01;35:*.jpeg=01;35:*.gif=01;35:*.bmp=01;35:*. pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xb m=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png =01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.avi= 01;35:*.fli=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;3 5:*.xwd=01;35:*.flac=01;35:*.mp3=01;35:*.mpc=01;35 :*.ogg=01;35:*.wav=01;35:
> _SERVER["LANG"]en_US.UTF-8
> _SERVER["HISTCONTROL"]ignoredups
> _SERVER["SHLVL"]1
> _SERVER["CONTENT_LENGTH"]4
> _SERVER["LESSOPEN"]| /usr/bin/lesspipe %s
> _SERVER["HTTP_METHOD"]POST
> _SERVER["CONTENT_TYPE"]application/x-www-form-urlencoded
> _SERVER["LESSCLOSE"]/usr/bin/lesspipe %s %s
> _SERVER["_"]/usr/bin/php-cgi
> _SERVER["PHP_SELF"]<i>no value</i>
> _SERVER["REQUEST_TIME"]1205702297
> _SERVER["argv"]</td><td class="v"><pre>Array
> (
> [0] =&gt; phpinfo.php
> )
> </pre>
>
> _SERVER["argc"]1
> _ENV["TERM"]xterm
> _ENV["SHELL"]/bin/bash
> _ENV["SSH_TTY"]/dev/pts/1
> _ENV["CONTENT_LENG"]4
> _ENV["LD_LIBRARY_PATH"]/usr/local/lib
>
> _ENV["LS_COLORS"]no=00:fi=00:di=01;34:ln=01;36:pi=40;33:so=01;35:do =01;35:bd=40;33;01:cd=40;33;01r=40;31;01:su=37;4 1:sg=30;43:tw=30;42w=34;42:st=37;44:ex=01;32:*.t ar=01;31:*.tgz=01;31:*.arj=01;31:*.taz=01;31:*.lzh =01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.gz=01;31: *.bz2=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*. jpg=01;35:*.jpeg=01;35:*.gif=01;35:*.bmp=01;35:*.p bm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm =01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png= 01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.avi=0 1;35:*.fli=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35 :*.xwd=01;35:*.flac=01;35:*.mp3=01;35:*.mpc=01;35: *.ogg=01;35:*.wav=01;35:
> _ENV["LANG"]en_US.UTF-8
> _ENV["HISTCONTROL"]ignoredups
> _ENV["SHLVL"]1
> _ENV["CONTENT_LENGTH"]4
> _ENV["LESSOPEN"]| /usr/bin/lesspipe %s
> _ENV["HTTP_METHOD"]POST
> _ENV["CONTENT_TYPE"]application/x-www-form-urlencoded
> _ENV["LESSCLOSE"]/usr/bin/lesspipe %s %s
> _ENV["_"]/usr/bin/php-cgi
>
>