loop-linux2.c revision 1.5 
1/*
2 * Copyright (c) 1993-95 Mats O Jansson.  All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24
25#ifndef LINT
26static const char rcsid[] = "$Id: loop-linux2.c,v 1.5 2005/12/21 01:40:24 millert Exp $";
27#endif
28
29#include <errno.h>
30#include <stdlib.h>
31#include <strings.h>
32#include <unistd.h>
33#if defined(__bsdi__) || defined(__FreeBSD__)
34#include <sys/time.h>
35#endif
36#include <sys/ioctl.h>
37
38#include "os.h"
39#include "common/common.h"
40#include "common/mopdef.h"
41
42int
43mopOpenRC(p, trans)
44	struct if_info *p;
45	int	trans;
46{
47#ifndef NORC
48	return (*(p->iopen))(p->if_name,
49			     O_RDWR,
50			     MOP_K_PROTO_RC,
51			     trans);
52#else
53	return -1;
54#endif
55}
56
57int
58mopOpenDL(p, trans)
59	struct if_info *p;
60	int	trans;
61{
62#ifndef NODL
63	return (*(p->iopen))(p->if_name,
64			     O_RDWR,
65			     MOP_K_PROTO_DL,
66			     trans);
67#else
68	return -1;
69#endif
70}
71
72void
73mopReadRC()
74{
75}
76
77void
78mopReadDL()
79{
80}
81
82/*
83 * The list of all interfaces that are being listened to.  loop()
84 * "selects" on the descriptors in this list.
85 */
86struct if_info *iflist;
87
88void   mopProcess(struct if_info *, u_char *);
89
90/*
91 * Loop indefinitely listening for MOP requests on the
92 * interfaces in 'iflist'.
93 */
94void
95Loop()
96{
97	u_char *buf, *bp, *ep;
98	int     cc;
99	fd_set  fds, listeners;
100	int     bufsize = 1100, maxfd =0;
101	struct if_info *ii;
102
103/* FIXME : this is a hack, for some reason specifying an interface would
104 * cause it to fail because bufsize is an impossible number, so I added a
105 * sanity check because I'm too lazy to figure out why. -- Karl
106 */
107	if (bufsize > 1100)
108	 	bufsize = 64;
109
110	if (iflist == 0) {
111		syslog(LOG_ERR, "no interfaces");
112		exit(0);
113	}
114
115	 buf = (u_char *) malloc((unsigned) bufsize);
116
117	if (buf == 0) {
118		syslog(LOG_ERR, "malloc: %m");
119		exit(0);
120	}
121	/*
122         * Find the highest numbered file descriptor for select().
123         * Initialize the set of descriptors to listen to.
124         */
125	FD_ZERO(&fds);
126	for (ii = iflist; ii; ii = ii->next) {
127		if (ii->fd != -1) {
128			FD_SET(ii->fd, &fds);
129			if (ii->fd > maxfd)
130				maxfd = ii->fd;
131	        }
132	}
133	while (1) {
134		listeners = fds;
135		if (select(maxfd + 1, &listeners, (fd_set *) 0,
136			(fd_set *) 0, (struct timeval *) 0) < 0) {
137			syslog(LOG_ERR, "select: %m");
138			exit(0);
139		}
140		for (ii = iflist; ii; ii = ii->next) {
141			if (ii->fd != -1) {
142				if (!FD_ISSET(ii->fd, &listeners))
143					continue;
144			}
145	again:
146			cc = read(ii->fd, (char *) buf, bufsize);
147			/* Don't choke when we get ptraced */
148			if (cc < 0 && errno == EINTR)
149				goto again;
150
151			bp = buf;
152			ep = bp + cc;
153
154if(bp < ep)
155	{
156	mopProcess(ii,buf);
157	}
158
159}
160
161}
162}
163
164