accf_dns(9) [debian man page]

ACCF_DNS(9)						   BSD Kernel Developer's Manual					       ACCF_DNS(9)

NAME

     accf_dns -- buffer incoming DNS requests until the whole first request is present

SYNOPSIS

     options INET
     options ACCEPT_FILTER_DNS
     kldload accf_dns

DESCRIPTION

     This is a filter to be placed on a socket that will be using accept() to receive incoming connections.

     It prevents the application from receiving the connected descriptor via accept() until a whole DNS request is available on the socket.  It
     does this by reading the first two bytes of the request, to determine its size, and waiting until the required amount of data is available to
     be read.

     The ACCEPT_FILTER_DNS kernel option is also a module that can be enabled at runtime via kldload(8) if the INET option has been compiled into
     the kernel.

EXAMPLES

     If the accf_dns module is available in the kernel, the following code will enable the DNS accept filter on a socket sok.

	     struct accept_filter_arg afa;

	     bzero(&afa, sizeof(afa));
	     strcpy(afa.af_name, "dnsready");
	     setsockopt(sok, SOL_SOCKET, SO_ACCEPTFILTER, &afa, sizeof(afa));

SEE ALSO

     setsockopt(2), accept_filter(9), accf_http(9) accf_data(9)

HISTORY

     The accept filter mechanism was introduced in FreeBSD 4.0.

AUTHORS

     This manual page and the filter were written by David Malone.

BSD
								   July 16, 2008							       BSD

Check Out this Related Man Page

ACCF_DATA(9)						   BSD Kernel Developer's Manual					      ACCF_DATA(9)

NAME

     accf_data -- buffer incoming connections until data arrives

SYNOPSIS

     options INET
     options ACCEPT_FILTER_DATA
     kldload accf_data

DESCRIPTION

     This is a filter to be placed on a socket that will be using accept() to receive incoming connections.

     It prevents the application from receiving the connected descriptor via accept() until data arrives on the connection.

     The ACCEPT_FILTER_DATA kernel option is also a module that can be enabled at runtime via kldload(8) if the INET option has been compiled into
     the kernel.

EXAMPLES

     Assuming ACCEPT_FILTER_DATA has been included in the kernel config file or the accf_data module has been loaded, this will enable the data
     accept filter on the socket sok.

	     struct accept_filter_arg afa;

	     bzero(&afa, sizeof(afa));
	     strcpy(afa.af_name, "dataready");
	     setsockopt(sok, SOL_SOCKET, SO_ACCEPTFILTER, &afa, sizeof(afa));

SEE ALSO

     setsockopt(2), accept_filter(9), accf_dns(9) accf_http(9)

HISTORY

     The accept filter mechanism and the accf_data filter were introduced in FreeBSD 4.0.

AUTHORS

     This manual page and the filter were written by Alfred Perlstein.

BSD
								 November 15, 2000							       BSD

Linux and UNIX Man Pages

accf_dns(9) [debian man page]

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