The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netncp/ncp_subr.c

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    1 /*-
    2  * Copyright (c) 1999, 2000, 2001 Boris Popov
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/errno.h>
   33 #include <sys/eventhandler.h>
   34 #include <sys/kernel.h>
   35 #include <sys/lock.h>
   36 #include <sys/malloc.h>
   37 #include <sys/proc.h>
   38 #include <sys/sysctl.h>
   39 #include <sys/time.h>
   40 
   41 #include <netncp/ncp.h>
   42 #include <netncp/ncp_conn.h>
   43 #include <netncp/ncp_sock.h>
   44 #include <netncp/ncp_subr.h>
   45 #include <netncp/ncp_rq.h>
   46 #include <netncp/ncp_ncp.h>
   47 #include <netncp/nwerror.h>
   48 
   49 int ncp_debuglevel = 0;
   50 
   51 struct callout_handle ncp_timer_handle;
   52 static eventhandler_tag ncp_exit_tag;
   53 
   54 static void ncp_at_exit(void *arg, struct proc *p);
   55 static void ncp_timer(void *arg);
   56 
   57 /*
   58  * duplicate string from user space. It should be very-very slow.
   59  */
   60 char *
   61 ncp_str_dup(char *s) {
   62         char *p, bt;
   63         int len = 0;
   64 
   65         for (p = s;;p++) {
   66                 if (copyin(p, &bt, 1)) return NULL;
   67                 len++;
   68                 if (bt == 0) break;
   69         }
   70         p = malloc(len, M_NCPDATA, M_WAITOK);
   71         copyin(s, p, len);
   72         return p;
   73 }
   74 
   75 
   76 void
   77 ncp_at_exit(void *arg, struct proc *p)
   78 {
   79         struct ncp_conn *ncp, *nncp;
   80         struct thread *td;
   81 
   82         mtx_lock(&Giant);
   83         FOREACH_THREAD_IN_PROC(p, td) {
   84                 if (ncp_conn_putprochandles(td) == 0)
   85                         continue;
   86 
   87                 ncp_conn_locklist(LK_EXCLUSIVE, td);
   88                 for (ncp = SLIST_FIRST(&conn_list); ncp; ncp = nncp) {
   89                         nncp = SLIST_NEXT(ncp, nc_next);
   90                         if (ncp_conn_lock(ncp, td, td->td_ucred,
   91                                           NCPM_READ | NCPM_EXECUTE | NCPM_WRITE))
   92                                 continue;
   93                         if (ncp_conn_free(ncp) != 0)
   94                                 ncp_conn_unlock(ncp, td);
   95                 }
   96                 ncp_conn_unlocklist(td);
   97         }
   98         mtx_unlock(&Giant);
   99 }
  100 
  101 int
  102 ncp_init(void)
  103 {
  104         ncp_conn_init();
  105         ncp_exit_tag = EVENTHANDLER_REGISTER(process_exit, ncp_at_exit, NULL,
  106             EVENTHANDLER_PRI_ANY);
  107         ncp_timer_handle = timeout(ncp_timer, NULL, NCP_TIMER_TICK);
  108         return 0;
  109 }
  110 
  111 int
  112 ncp_done(void)
  113 {
  114         int error;
  115 
  116         error = ncp_conn_destroy();
  117         if (error)
  118                 return error;
  119         untimeout(ncp_timer, NULL, ncp_timer_handle);
  120         EVENTHANDLER_DEREGISTER(process_exit, ncp_exit_tag);
  121         return 0;
  122 }
  123 
  124 
  125 /* tick every second and check for watch dog packets and lost connections */
  126 static void
  127 ncp_timer(void *arg)
  128 {
  129         struct ncp_conn *conn;
  130 
  131         if(ncp_conn_locklist(LK_SHARED | LK_NOWAIT, NULL) == 0) {
  132                 SLIST_FOREACH(conn, &conn_list, nc_next)
  133                         ncp_check_conn(conn);
  134                 ncp_conn_unlocklist(NULL);
  135         }
  136         ncp_timer_handle = timeout(ncp_timer, NULL, NCP_TIMER_TICK);
  137 }

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