1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
|
/* $OpenBSD: loop-bsd.c,v 1.7 2003/06/02 21:38:39 maja Exp $ */
/*
* Copyright (c) 1993-95 Mats O Jansson. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef LINT
static char rcsid[] = "$OpenBSD: loop-bsd.c,v 1.7 2003/06/02 21:38:39 maja Exp $";
#endif
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#if defined(__bsdi__) || defined(__FreeBSD__)
#include <sys/time.h>
#endif
#include <net/bpf.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include "os.h"
#include "common/common.h"
#include "common/mopdef.h"
int
mopOpenRC(p, trans)
struct if_info *p;
int trans;
{
#ifndef NORC
return (*(p->iopen))(p->if_name,
O_RDWR,
MOP_K_PROTO_RC,
trans);
#else
return -1;
#endif
}
int
mopOpenDL(p, trans)
struct if_info *p;
int trans;
{
#ifndef NODL
return (*(p->iopen))(p->if_name,
O_RDWR,
MOP_K_PROTO_DL,
trans);
#else
return -1;
#endif
}
void
mopReadRC()
{
}
void
mopReadDL()
{
}
/*
* The list of all interfaces that are being listened to. loop()
* "selects" on the descriptors in this list.
*/
struct if_info *iflist;
void mopProcess(struct if_info *, u_char *);
/*
* Loop indefinitely listening for MOP requests on the
* interfaces in 'iflist'.
*/
void
Loop()
{
u_char *buf, *bp, *ep;
int cc;
fd_set fds, listeners;
int bufsize, maxfd = 0;
struct if_info *ii;
if (iflist == 0) {
syslog(LOG_ERR, "no interfaces");
exit(0);
}
if (iflist->fd != -1) {
if (ioctl(iflist->fd, BIOCGBLEN, (caddr_t) & bufsize) < 0) {
syslog(LOG_ERR, "BIOCGBLEN: %m");
exit(0);
}
}
buf = (u_char *) malloc((unsigned) bufsize);
if (buf == 0) {
syslog(LOG_ERR, "malloc: %m");
exit(0);
}
/*
* Find the highest numbered file descriptor for select().
* Initialize the set of descriptors to listen to.
*/
FD_ZERO(&fds);
for (ii = iflist; ii; ii = ii->next) {
if (ii->fd != -1) {
FD_SET(ii->fd, &fds);
if (ii->fd > maxfd)
maxfd = ii->fd;
}
}
while (1) {
listeners = fds;
if (select(maxfd + 1, &listeners, (fd_set *) 0,
(fd_set *) 0, (struct timeval *) 0) < 0) {
syslog(LOG_ERR, "select: %m");
exit(0);
}
for (ii = iflist; ii; ii = ii->next) {
if (ii->fd != -1) {
if (!FD_ISSET(ii->fd, &listeners))
continue;
}
again:
cc = read(ii->fd, (char *) buf, bufsize);
/* Don't choke when we get ptraced */
if (cc < 0 && errno == EINTR)
goto again;
/* Due to a SunOS bug, after 2^31 bytes, the file
* offset overflows and read fails with EINVAL. The
* lseek() to 0 will fix things. */
if (cc < 0) {
if (errno == EINVAL &&
(lseek(ii->fd, 0, SEEK_CUR) + bufsize) < 0) {
(void) lseek(ii->fd, 0, 0);
goto again;
}
syslog(LOG_ERR, "read: %m");
exit(0);
}
/* Loop through the packet(s) */
#define bhp ((struct bpf_hdr *)bp)
bp = buf;
ep = bp + cc;
while (bp < ep) {
int caplen, hdrlen;
caplen = bhp->bh_caplen;
hdrlen = bhp->bh_hdrlen;
mopProcess(ii, bp + hdrlen);
bp += BPF_WORDALIGN(hdrlen + caplen);
}
}
}
}
|
