FreeBSD/Linux Kernel Cross Reference
sys/netncp/ncp_subr.c
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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Boris Popov.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * $FreeBSD: releng/5.1/sys/netncp/ncp_subr.c 112564 2003-03-24 21:15:35Z jhb $
33 */
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/errno.h>
37 #include <sys/eventhandler.h>
38 #include <sys/kernel.h>
39 #include <sys/lock.h>
40 #include <sys/malloc.h>
41 #include <sys/proc.h>
42 #include <sys/sysctl.h>
43 #include <sys/time.h>
44
45 #include <netncp/ncp.h>
46 #include <netncp/ncp_conn.h>
47 #include <netncp/ncp_sock.h>
48 #include <netncp/ncp_subr.h>
49 #include <netncp/ncp_rq.h>
50 #include <netncp/ncp_ncp.h>
51 #include <netncp/nwerror.h>
52
53 int ncp_debuglevel = 0;
54
55 struct callout_handle ncp_timer_handle;
56 static eventhandler_tag ncp_exit_tag;
57
58 static void ncp_at_exit(void *arg, struct proc *p);
59 static void ncp_timer(void *arg);
60
61 /*
62 * duplicate string from user space. It should be very-very slow.
63 */
64 char *
65 ncp_str_dup(char *s) {
66 char *p, bt;
67 int len = 0;
68
69 for (p = s;;p++) {
70 if (copyin(p, &bt, 1)) return NULL;
71 len++;
72 if (bt == 0) break;
73 }
74 MALLOC(p, char*, len, M_NCPDATA, M_WAITOK);
75 copyin(s, p, len);
76 return p;
77 }
78
79
80 void
81 ncp_at_exit(void *arg, struct proc *p)
82 {
83 struct ncp_conn *ncp, *nncp;
84 struct thread *td;
85
86 FOREACH_THREAD_IN_PROC(p, td) {
87 if (ncp_conn_putprochandles(td) == 0)
88 continue;
89
90 ncp_conn_locklist(LK_EXCLUSIVE, td);
91 for (ncp = SLIST_FIRST(&conn_list); ncp; ncp = nncp) {
92 nncp = SLIST_NEXT(ncp, nc_next);
93 if (ncp_conn_lock(ncp, td, td->td_ucred,
94 NCPM_READ | NCPM_EXECUTE | NCPM_WRITE))
95 continue;
96 if (ncp_conn_free(ncp) != 0)
97 ncp_conn_unlock(ncp, td);
98 }
99 ncp_conn_unlocklist(td);
100 }
101 }
102
103 int
104 ncp_init(void)
105 {
106 ncp_conn_init();
107 ncp_exit_tag = EVENTHANDLER_REGISTER(process_exit, ncp_at_exit, NULL,
108 EVENTHANDLER_PRI_ANY);
109 ncp_timer_handle = timeout(ncp_timer, NULL, NCP_TIMER_TICK);
110 return 0;
111 }
112
113 int
114 ncp_done(void)
115 {
116 int error;
117
118 error = ncp_conn_destroy();
119 if (error)
120 return error;
121 untimeout(ncp_timer, NULL, ncp_timer_handle);
122 EVENTHANDLER_DEREGISTER(process_exit, ncp_exit_tag);
123 return 0;
124 }
125
126
127 /* tick every second and check for watch dog packets and lost connections */
128 static void
129 ncp_timer(void *arg)
130 {
131 struct ncp_conn *conn;
132
133 if(ncp_conn_locklist(LK_SHARED | LK_NOWAIT, NULL) == 0) {
134 SLIST_FOREACH(conn, &conn_list, nc_next)
135 ncp_check_conn(conn);
136 ncp_conn_unlocklist(NULL);
137 }
138 ncp_timer_handle = timeout(ncp_timer, NULL, NCP_TIMER_TICK);
139 }
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