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So basically, I followed this guide about iptraf monitoring and rrdtool to the letter. I put it in /usr/lib/cgi-bin/ as usual for cgi scripts. Then, when I visit it from a browser, the images it makes appears to be broken. I set the permissions to 777 temporarily for debugging purposes. I think Apache2 is trying to execute the png files as a script. How do I prevent that? Below are my configuration files. Thanks in advance!

Oh. And I'm running as root.

#tail /var/log/apache2/error.log [Sun Mar 01 06:13:05 2015] [error] [client 192.168.0.241] Premature end of script headers: tcp_services-25-6hr.png, referer: http://192.168.0.1/cgi-bin/tcp.cgi [Sun Mar 01 06:13:05 2015] [error] [client 192.168.0.241] Premature end of script headers: tcp_services-80-6hr.png, referer: http://192.168.0.1/cgi-bin/tcp.cgi [Sun Mar 01 06:13:05 2015] [error] [client 192.168.0.241] Premature end of script headers: tcp_services-22-6hr.png, referer: http://192.168.0.1/cgi-bin/tcp.cgi [Sun Mar 01 06:13:49 2015] [error] [client 192.168.0.241] (8)Exec format error: exec of '/usr/lib/cgi-bin/tcp_services-80-6hr.png' failed, referer: http://192.168 .0.1/cgi-bin/tcp.cgi [Sun Mar 01 06:13:49 2015] [error] [client 192.168.0.241] Premature end of script headers: tcp_services-80-6hr.png, referer: http://192.168.0.1/cgi-bin/tcp.cgi [Sun Mar 01 06:13:49 2015] [error] [client 192.168.0.241] (8)Exec format error: exec of '/usr/lib/cgi-bin/tcp_services-119-6hr.png' failed, referer: http://192.16 8.0.1/cgi-bin/tcp.cgi [Sun Mar 01 06:13:49 2015] [error] [client 192.168.0.241] Premature end of script headers: tcp_services-119-6hr.png, referer: http://192.168.0.1/cgi-bin/tcp.cgi [Sun Mar 01 06:13:49 2015] [error] [client 192.168.0.241] (8)Exec format error: exec of '/usr/lib/cgi-bin/tcp_services-25-6hr.png' failed, referer: http://192.168 .0.1/cgi-bin/tcp.cgi [Sun Mar 01 06:13:49 2015] [error] [client 192.168.0.241] Premature end of script headers: tcp_services-25-6hr.png, referer: http://192.168.0.1/cgi-bin/tcp.cgi [Sun Mar 01 06:14:04 2015] [error] [client 192.168.0.241] (8)Exec format error: exec of '/usr/lib/cgi-bin/tcp_services-22-6hr.png' failed, referer: http://192.168 .0.1/cgi-bin/tcp.cgi [Sun Mar 01 06:14:04 2015] [error] [client 192.168.0.241] Premature end of script headers: tcp_services-22-6hr.png, referer: http://192.168.0.1/cgi-bin/tcp.cgi [Sun Mar 01 06:14:04 2015] [error] [client 192.168.0.241] (8)Exec format error: exec of '/usr/lib/cgi-bin/tcp_services-80-6hr.png' failed, referer: http://192.168 .0.1/cgi-bin/tcp.cgi [Sun Mar 01 06:14:04 2015] [error] [client 192.168.0.241] (8)Exec format error: exec of '/usr/lib/cgi-bin/tcp_services-443-6hr.png' failed, referer: http://192.16 8.0.1/cgi-bin/tcp.cgi [Sun Mar 01 06:14:04 2015] [error] [client 192.168.0.241] (8)Exec format error: exec of '/usr/lib/cgi-bin/tcp_services-25-6hr.png' failed, referer: http://192.168 .0.1/cgi-bin/tcp.cgi [Sun Mar 01 06:14:04 2015] [error] [client 192.168.0.241] Premature end of script headers: tcp_services-80-6hr.png, referer: http://192.168.0.1/cgi-bin/tcp.cgi [Sun Mar 01 06:14:04 2015] [error] [client 192.168.0.241] Premature end of script headers: tcp_services-443-6hr.png, referer: http://192.168.0.1/cgi-bin/tcp.cgi [Sun Mar 01 06:14:04 2015] [error] [client 192.168.0.241] Premature end of script headers: tcp_services-25-6hr.png, referer: http://192.168.0.1/cgi-bin/tcp.cgi [Sun Mar 01 06:14:04 2015] [error] [client 192.168.0.241] (8)Exec format error: exec of '/usr/lib/cgi-bin/tcp_services-119-6hr.png' failed, referer: http://192.16 8.0.1/cgi-bin/tcp.cgi [Sun Mar 01 06:14:04 2015] [error] [client 192.168.0.241] Premature end of script headers: tcp_services-119-6hr.png, referer: http://192.168.0.1/cgi-bin/tcp.cgi [Sun Mar 01 06:14:12 2015] [error] [client 192.168.0.241] (8)Exec format error: exec of '/usr/lib/cgi-bin/tcp_services-22-6hr.png' failed, referer: http://192.168 .0.1/cgi-bin/tcp.cgi [Sun Mar 01 06:14:12 2015] [error] [client 192.168.0.241] Premature end of script headers: tcp_services-22-6hr.png, referer: http://192.168.0.1/cgi-bin/tcp.cgi

This is the sites-enabled configuration.

#cat /etc/apache2/sites-enabled/001-exynis <VirtualHost *:80> ServerAdmin webmaster@localhost DocumentRoot /var/www <Directory /> Options +ExecCGI FollowSymLinks AllowOverride None </Directory> <Directory /var/www/> Options +ExecCGI Indexes FollowSymLinks MultiViews AllowOverride None Order allow,deny allow from all </Directory> <Directory /var/www/tcpmon/> Options +ExecCGI Indexes FollowSymLinks MultiViews AllowOverride None Order allow,deny allow from all </Directory> ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/ <Directory "/usr/lib/cgi-bin"> AllowOverride None Options +ExecCGI MultiViews +SymLinksIfOwnerMatch Order allow,deny Allow from all </Directory> ErrorLog ${APACHE_LOG_DIR}/error.log # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. LogLevel warn CustomLog ${APACHE_LOG_DIR}/access.log combined </VirtualHost>

And this is my apache2.conf file. I added the AddHandler and ScriptAlias at the bottom.

#cat /etc/apache2/apache2.conf # This is the main Apache server configuration file. It contains the # configuration directives that give the server its instructions. # See http://httpd.apache.org/docs/2.2/ for detailed information about # the directives and /usr/share/doc/apache2-common/README.Debian.gz about # Debian specific hints. # It is split into several files forming the configuration hierarchy outlined # below, all located in the /etc/apache2/ directory: # # /etc/apache2/ # |-- apache2.conf # | `-- ports.conf # |-- mods-enabled # | |-- *.load # | `-- *.conf # |-- conf.d # | `-- * # `-- sites-enabled # `-- * # # # * apache2.conf is the main configuration file (this file). It puts the pieces # together by including all remaining configuration files when starting up the # web server. # Global configuration # # # ServerRoot: The top of the directory tree under which the server's # configuration, error, and log files are kept. # # NOTE! If you intend to place this on an NFS (or otherwise network) # mounted filesystem then please read the LockFile documentation (available # at <URL:http://httpd.apache.org/docs/2.2/mod/mpm_common.html#lockfile>); # you will save yourself a lot of trouble. # # Do NOT add a slash at the end of the directory path. # #ServerRoot "/etc/apache2" # # The accept serialization lock file MUST BE STORED ON A LOCAL DISK. # LockFile ${APACHE_LOCK_DIR}/accept.lock # # PidFile: The file in which the server should record its process # identification number when it starts. # This needs to be set in /etc/apache2/envvars # PidFile ${APACHE_PID_FILE} # # Timeout: The number of seconds before receives and sends time out. # Timeout 300 # # KeepAlive: Whether or not to allow persistent connections (more than # one request per connection). Set to "Off" to deactivate. # KeepAlive On # # MaxKeepAliveRequests: The maximum number of requests to allow # during a persistent connection. Set to 0 to allow an unlimited amount. # We recommend you leave this number high, for maximum performance. # MaxKeepAliveRequests 100 # # KeepAliveTimeout: Number of seconds to wait for the next request from the # same client on the same connection. # KeepAliveTimeout 5 ## ## Server-Pool Size Regulation (MPM specific) ## # prefork MPM # StartServers: number of server processes to start # MinSpareServers: minimum number of server processes which are kept spare # MaxSpareServers: maximum number of server processes which are kept spare # MaxClients: maximum number of server processes allowed to start # MaxRequestsPerChild: maximum number of requests a server process serves <IfModule mpm_prefork_module> StartServers 5 MinSpareServers 5 MaxSpareServers 10 MaxClients 150 MaxRequestsPerChild 0 </IfModule> # worker MPM # StartServers: initial number of server processes to start # MinSpareThreads: minimum number of worker threads which are kept spare # MaxSpareThreads: maximum number of worker threads which are kept spare # ThreadLimit: ThreadsPerChild can be changed to this maximum value during a # graceful restart. ThreadLimit can only be changed by stopping # and starting Apache. # ThreadsPerChild: constant number of worker threads in each server process # MaxClients: maximum number of simultaneous client connections # MaxRequestsPerChild: maximum number of requests a server process serves <IfModule mpm_worker_module> StartServers 2 MinSpareThreads 25 MaxSpareThreads 75 ThreadLimit 64 ThreadsPerChild 25 MaxClients 150 MaxRequestsPerChild 0 </IfModule> # event MPM # StartServers: initial number of server processes to start # MinSpareThreads: minimum number of worker threads which are kept spare # MaxSpareThreads: maximum number of worker threads which are kept spare # ThreadsPerChild: constant number of worker threads in each server process # MaxClients: maximum number of simultaneous client connections # MaxRequestsPerChild: maximum number of requests a server process serves <IfModule mpm_event_module> StartServers 2 MinSpareThreads 25 MaxSpareThreads 75 ThreadLimit 64 ThreadsPerChild 25 MaxClients 150 MaxRequestsPerChild 0 </IfModule> # These need to be set in /etc/apache2/envvars User ${APACHE_RUN_USER} Group ${APACHE_RUN_GROUP} # # AccessFileName: The name of the file to look for in each directory # for additional configuration directives. See also the AllowOverride # directive. # AccessFileName .htaccess # # The following lines prevent .htaccess and .htpasswd files from being # viewed by Web clients. # <Files ~ "^\.ht"> Order allow,deny Deny from all Satisfy all </Files> # # DefaultType is the default MIME type the server will use for a document # if it cannot otherwise determine one, such as from filename extensions. # If your server contains mostly text or HTML documents, "text/plain" is # a good value. If most of your content is binary, such as applications # or images, you may want to use "application/octet-stream" instead to # keep browsers from trying to display binary files as though they are # text. # # It is also possible to omit any default MIME type and let the # client's browser guess an appropriate action instead. Typically the # browser will decide based on the file's extension then. In cases # where no good assumption can be made, letting the default MIME type # unset is suggested instead of forcing the browser to accept # incorrect metadata. # DefaultType None # # HostnameLookups: Log the names of clients or just their IP addresses # e.g., www.apache.org (on) or 204.62.129.132 (off). # The default is off because it'd be overall better for the net if people # had to knowingly turn this feature on, since enabling it means that # each client request will result in AT LEAST one lookup request to the # nameserver. # HostnameLookups Off # ErrorLog: The location of the error log file. # If you do not specify an ErrorLog directive within a <VirtualHost> # container, error messages relating to that virtual host will be # logged here. If you *do* define an error logfile for a <VirtualHost> # container, that host's errors will be logged there and not here. # ErrorLog ${APACHE_LOG_DIR}/error.log # # LogLevel: Control the number of messages logged to the error_log. # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. # LogLevel warn # Include module configuration: Include mods-enabled/*.load Include mods-enabled/*.conf # Include list of ports to listen on and which to use for name based vhosts Include ports.conf # # The following directives define some format nicknames for use with # a CustomLog directive (see below). # If you are behind a reverse proxy, you might want to change %h into %{X-Forwarded-For}i # LogFormat "%v:%p %h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined LogFormat "%h %{X-Forwarded-For}i %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" combined LogFormat "%h %l %u %t \"%r\" %>s %O" common LogFormat "%{Referer}i -> %U" referer LogFormat "%{User-agent}i" agent # Include of directories ignores editors' and dpkg's backup files, # see the comments above for details. # Include generic snippets of statements Include conf.d/ # Include the virtual host configurations: Include sites-enabled/ ServerName myserver AddHandler cgi-script .rcgi .cgi ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/ AddType image/png .png AddType image/gif .gif
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2 Answers 2

Reset to default
5

Move your pictures out of /usr/lib//cgi-bin/ folder and put them somewhere within /var/www/ Update your paths accordingly.

Every time you trying to access any file within cgi-bin path it is expecting that content will be generated by executing that file.

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  • Yup. That did it. Commented Mar 1, 2015 at 11:34
  • 1
    And setting +x to .png (with chmod 777) doesn't help on that matter. Commented Mar 1, 2015 at 13:42
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We serve one of our puny websites from a NAS-CIFS-share, so the unix-modes are all made up crock. Everything is mode-executable and nothing can be changed with chmod.

I found my problem was the ScriptAlias which told Apache to execute everything, even images. I thought going <Directory ...> -ExecCGI... for the img-sub-directory might be a good idea, but did not work.

I fixed my problem by moving the images out from under the bin-dir (now they are sisters) and adding a separate Alias (no Script!) and <Directory...>.

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