/apache-module-sockopts

The apache module to set socket options.

Primary LanguageC

Apache module for setting socket options

License

This module provides a set socket options. The following socket option lists are available in this module:

  • TCP_DEFER_ACCEPT
  • SO_SNDTIMEO
  • SO_RCVTIMEO
  • SO_SNDBUF
  • SO_RCVBUF

This program has been rewritten.(original)

Dependencies

  • Apache1
  • Apxs

Installation

shell> git clone git://github.com/vozlt/mod_sockopts.git

shell> cd mod_sockopts

shell> apxs -iac mod_sockotps.c

Configuration(httpd.conf)

LoadModule sockopts_module    libexec/mod_sockopts.so

AddModule mod_sockopts.c

<IfModule mod_sockopts.c>
    # TCP_DEFER_ACCEPT
    SoTcpDeferAccept    20

    # SO_SNDTIMEO - not effective(socket is not closed and be continued the data transfering)
    # SoSoSndTimeo      5

    # SO_RCVTIMEO - not effective(socket is not closed and be continued the data transfering)
    # SoSoRcvTimeo      5

    # SO_SNDBUF
    # SoSoSndBuf        512

    # SO_RCVBUF
    # SoSoRcvBuf        512
</IfModule>
SoTcpDeferAccept
# Syntax
SoTcpDeferAccept        {SECONDS}
shell> vi linux-2.6.32-431.el6/net/ipv4/tcp.c

331 /* Convert seconds to retransmits based on initial and max timeout */
332 static u8 secs_to_retrans(int seconds, int timeout, int rto_max)
333 {
334     u8 res = 0;
335 
336     if (seconds > 0) {
337         int period = timeout;
338 
339         res = 1;
340         while (seconds > period && res < 255) {
341             res++;
342             timeout <<= 1;
343             if (timeout > rto_max)
344                 timeout = rto_max;
345             period += timeout;
346         }
347     }
348     return res;
349 }
.
.
.
2104 /*
2105  *  Socket option code for TCP.
2106  */
2107 static int do_tcp_setsockopt(struct sock *sk, int level,
2108         int optname, char __user *optval, unsigned int optlen)
2109 {
.
.
.
2252     case TCP_DEFER_ACCEPT:
2253         /* Translate value in seconds to number of retransmits */
2254         icsk->icsk_accept_queue.rskq_defer_accept =
2255             secs_to_retrans(val, TCP_TIMEOUT_INIT / HZ,
2256                     TCP_RTO_MAX / HZ);
2257         break;

Author

dean gaudet dean@arctic.org

YoungJoo.Kim [vozltx@gmail.com]