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Bug #52075 php -b 127.0.0.1 vs php -y php-fpm.conf -x
Submitted: 2010-06-13 13:38 UTC Modified: 2010-06-17 04:47 UTC
From: luk-4u at hotmail dot com Assigned: fat (profile)
Status: Closed Package: FPM related
PHP Version: 5.2.13 OS: ubuntu 9.04
Private report: No CVE-ID: None
 [2010-06-13 13:38 UTC] luk-4u at hotmail dot com
Description:
------------
As starting php-cgi in 2 ways, the 2 results were different. 
1./path/to/php-cgi -b 127.0.0.1:9000
2./path/to/php-cgi -y /path/to/php-fpm.conf -x 

The first one was correct.
The second, which said: 'No input file specified'.

As i tracked down the c code, i found out the reason finally, but dunno why still.


/php/to/phpsrc/TSRM/tsrm_virtual_cwd.c 
CWD_API int virutal_file_ex(cwd_state *state,.....)
around line 1339

the exact code block:

#if !defined(TSRM_WIN32) && !defined(NETWARE)
..........
if (use_realpath == CWD_REALPATH) {
		return 1;
}
	goto no_realpath;

		
It's the above function that keeps the problem presenting.. 
As i tested, while started as the 1st way, this function return 0, and the tsrm_realpath returns NULL, also tsrm_realpath was called from init_request_info. I think u must be familiarer with the code.
And the 2cd way was all right.

Here is my nginx(0.6.39) conf block:
 server {
                listen 80;
                server_name pk.local.com;
                index index.php;
                root  /home/zyk/pk_local;
                location / {
                        root /home/zyk/pk_local;
                       fastcgi_pass 127.0.0.1:9000;
                      #  fastcgi_pass unix:/usr/local/app/php/logs/php.sock;
                        fastcgi_index index.php;
                        fastcgi_intercept_errors on;
                        include fcgi.conf;
                        include fastcgi_params.default;
                        }
                }

}
Dir /home/zyk/pk_local is RW for the php daemon userid. 

Here is my php configure option:

configure --enable-fastcgi --enable-fpm --enable-mbstring --prefix=/usr/local/app/php

Here is my php-fpm.conf
<?xml version="1.0" ?>
<configuration>

	All relative paths in this config are relative to php's install prefix

	<section name="global_options">

		Pid file
		<value name="pid_file">/usr/local/app/php/logs/php-fpm.pid</value>

		Error log file
		<value name="error_log">/usr/local/app/php/logs/php-fpm.log</value>

		Log level
		<value name="log_level">notice</value>

		When this amount of php processes exited with SIGSEGV or SIGBUS ...
		<value name="emergency_restart_threshold">10</value>

		... in a less than this interval of time, a graceful restart will be initiated.
		Useful to work around accidental curruptions in accelerator's shared memory.
		<value name="emergency_restart_interval">1m</value>

		Time limit on waiting child's reaction on signals from master
		<value name="process_control_timeout">5s</value>

		Set to 'no' to debug fpm
		<value name="daemonize">no</value>

	</section>

	<workers>

		<section name="pool">

			Name of pool. Used in logs and stats.
			<value name="name">default</value>

			Address to accept fastcgi requests on.
			Valid syntax is 'ip.ad.re.ss:port' or just 'port' or '/path/to/unix/socket'
			<value name="listen_address">127.0.0.1:9000</value>

			<value name="listen_options">

				Set listen(2) backlog
				<value name="backlog">-1</value>

				Set permissions for unix socket, if one used.
				In Linux read/write permissions must be set in order to allow connections from web server.
				Many BSD-derrived systems allow connections regardless of permissions.
				<value name="owner">nobody</value>
				<value name="group">nobody</value>
				<value name="mode">0666</value>
			</value>

			Additional php.ini defines, specific to this pool of workers.
			<value name="php_defines">
		<!--		<value name="sendmail_path">/usr/sbin/sendmail -t -i</value>		-->
		<!--		<value name="display_errors">0</value>								-->
				<value name="SERVER_SOFTWARE">nginx</value>								
			</value>

			Unix user of processes
			<value name="user">nobody</value>				

			Unix group of processes
			<value name="group">nobody</value>		

			Process manager settings
			<value name="pm">

				Sets style of controling worker process count.
				Valid values are 'static' and 'apache-like'
				<value name="style">static</value>

				Sets the limit on the number of simultaneous requests that will be served.
				Equivalent to Apache MaxClients directive.
				Equivalent to PHP_FCGI_CHILDREN environment in original php.fcgi
				Used with any pm_style.
				<value name="max_children">5</value>

				Settings group for 'apache-like' pm style
				<value name="apache_like">

					Sets the number of server processes created on startup.
					Used only when 'apache-like' pm_style is selected
					<value name="StartServers">20</value>

					Sets the desired minimum number of idle server processes.
					Used only when 'apache-like' pm_style is selected
					<value name="MinSpareServers">5</value>

					Sets the desired maximum number of idle server processes.
					Used only when 'apache-like' pm_style is selected
					<value name="MaxSpareServers">35</value>

				</value>

			</value>

			The timeout (in seconds) for serving a single request after which the worker process will be terminated
			Should be used when 'max_execution_time' ini option does not stop script execution for some reason
			'0s' means 'off'
			<value name="request_terminate_timeout">0s</value>

			The timeout (in seconds) for serving of single request after which a php backtrace will be dumped to slow.log file
			'0s' means 'off'
			<value name="request_slowlog_timeout">0s</value>

			The log file for slow requests
			<value name="slowlog">logs/slow.log</value>

			Set open file desc rlimit
			<value name="rlimit_files">1024</value>

			Set max core size rlimit
			<value name="rlimit_core">0</value>

			Chroot to this directory at the start, absolute path
			<value name="chroot"></value>

			Chdir to this directory at the start, absolute path
			<value name="chdir"></value>

			Redirect workers' stdout and stderr into main error log.
			If not set, they will be redirected to /dev/null, according to FastCGI specs
			<value name="catch_workers_output">yes</value>

			How much requests each process should execute before respawn.
			Useful to work around memory leaks in 3rd party libraries.
			For endless request processing please specify 0
			Equivalent to PHP_FCGI_MAX_REQUESTS
			<value name="max_requests">500</value>

			Comma separated list of ipv4 addresses of FastCGI clients that allowed to connect.
			Equivalent to FCGI_WEB_SERVER_ADDRS environment in original php.fcgi (5.2.2+)
			Makes sense only with AF_INET listening socket.
			<value name="allowed_clients">127.0.0.1</value>

			Pass environment variables like LD_LIBRARY_PATH
			All $VARIABLEs are taken from current environment
			<value name="environment">
				<value name="HOSTNAME">$HOSTNAME</value>
				<value name="PATH">/usr/local/bin:/usr/bin:/bin</value>
				<value name="TMP">/tmp</value>
				<value name="TMPDIR">/tmp</value>
				<value name="TEMP">/tmp</value>
				<value name="OSTYPE">$OSTYPE</value>
				<value name="MACHTYPE">$MACHTYPE</value>
				<value name="MALLOC_CHECK_">2</value>
			</value>

		</section>

	</workers>

</configuration>

As i dunno if it's a bug yet, maybe it's configuration problem. But there is really no easy way to solve this particular stuff.

Any suggestions? 

Thanks in advance. 

Test script:
---------------
no test script 


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 [2010-06-13 13:41 UTC] luk-4u at hotmail dot com
"As i tested, while started as the 1st way, this function return 0, and the tsrm_realpath returns NULL' 
This sentence was written wrong, correct is : the 1st way returns 0; the second returns 1;
 [2010-06-13 15:10 UTC] kalle@php.net
-Package: CGI related +Package: FPM related
 [2010-06-13 15:56 UTC] fat@php.net
-Status: Open +Status: Closed -Assigned To: +Assigned To: fat
 [2010-06-13 15:56 UTC] fat@php.net
FPM is not supported on 5.2.x and your revision is old as the conf file is 
formatted in XML (now it's INI).

Please use 5.3.x from http://snaps.php.net/

If you're using the FPM patch from http://php-fpm.org to use FPM on 5.2.x, 
please ask on the FPM mailing list (http://groups.google.com/group/highload-php-
en).

++ Jerome
 [2010-06-17 04:47 UTC] luk-4u at hotmail dot com
To whomever maintains those code, i really recommond them to specify much more exact, accurate, detailed information for this 'bug', thanks. 
Finally i found out the why, tsrm_virtual_cwd.c :
....................
if (use_realpath != CWD_EXPAND) {
#if !defined(TSRM_WIN32) && !defined(NETWARE)
char resolved_path[MAXPATHLEN];

if (!realpath(path, resolved_path)) {  /* Note: Not threadsafe on older *BSD's */
perror("realpath error:");
  if (use_realpath == CWD_REALPATH) {
printf("=====================%d\n", __LINE__);
	return 1;
  }
  goto no_realpath;
}
..........................

perror outputs Permission denied, so why don't u enlarge this information somewhere in the error log, i mean to let the user have some place to figure out, maybe it's comsumptive in production environment, but u can enable it in a debug compile, and i know this block of code is not FPM specific. 
Maybe because i'm a newbie in this field, miraclely placed the webroot in my home directory, which other users' process doesn't have permission to go through, but i think 'No input file specified' is really too short, too expert-speaking.......
 
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