net/khttpd/sockets.c

   1 /*
   2
   3 kHTTPd -- the next generation
   4
   5 Basic socket functions
   6
   7 */
   8 /****************************************************************
   9  *      This program is free software; you can redistribute it and/or modify
  10  *      it under the terms of the GNU General Public License as published by
  11  *      the Free Software Foundation; either version 2, or (at your option)
  12  *      any later version.
  13  *
  14  *      This program is distributed in the hope that it will be useful,
  15  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *      GNU General Public License for more details.
  18  *
  19  *      You should have received a copy of the GNU General Public License
  20  *      along with this program; if not, write to the Free Software
  21  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  ****************************************************************/
  24
  25 #include "prototypes.h"
  26 #include <linux/kernel.h>
  27 #include <linux/net.h>
  28 #include <linux/version.h>
  29 #include <linux/smp_lock.h>
  30 #include <net/sock.h>
  31
  32
  33 /*
  34
  35 MainSocket is shared by all threads, therefore it has to be
  36 a global variable.
  37
  38 */
  39 struct socket *MainSocket=NULL;
  40
  41
  42 int StartListening(const int Port)
  43 {
  44         struct socket *sock;
  45         struct sockaddr_in sin;
  46         int error;
  47
  48         EnterFunction("StartListening");
  49
  50         /* First create a socket */
  51
  52         error = sock_create(PF_INET,SOCK_STREAM,IPPROTO_TCP,&sock);
  53         if (error<0)
  54              (void)printk(KERN_ERR "Error during creation of socket; terminating\n");
  55
  56
  57
  58         /* Now bind the socket */
  59
  60         sin.sin_family       = AF_INET;
  61         sin.sin_addr.s_addr  = INADDR_ANY;
  62         sin.sin_port         = htons((unsigned short)Port);
  63
  64         error = sock->ops->bind(sock,(struct sockaddr*)&sin,sizeof(sin));
  65         if (error<0)
  66         {
  67                 (void)printk(KERN_ERR "kHTTPd: Error binding socket. This means that some other \n");
  68                 (void)printk(KERN_ERR "        daemon is (or was a short time ago) using port %i.\n",Port);
  69                 return 0;
  70         }
  71
  72         /* Grrr... setsockopt() does this. */
  73         sock->sk->reuse   = 1;
  74         /* Wow!!! */
  75         sock->sk->linger  = 1;
  76
  77         /* Now, start listening on the socket */
  78
  79         /* I have no idea what a sane backlog-value is. 48 works so far. */
  80
  81         error=sock->ops->listen(sock,48);
  82         if (error!=0)
  83                 (void)printk(KERN_ERR "kHTTPd: Error listening on socket \n");
  84         sock->flags |= SO_ACCEPTCON;
  85
  86         MainSocket = sock;
  87
  88         EnterFunction("StartListening");
  89         return 1;
  90 }
  91
  92 void StopListening(void)
  93 {
  94         struct socket *sock;
  95
  96         EnterFunction("StopListening");
  97         if (MainSocket==NULL) return;
  98
  99         sock=MainSocket;
 100         MainSocket = NULL;
 101         sock_release(sock);
 102
 103         LeaveFunction("StopListening");
 104 }