1 /* $NetBSD: loop-linux2.c,v 1.3 2020/04/22 23:55:29 joerg Exp $ */
2
3 /*
4 * Copyright (c) 1993-95 Mats O Jansson. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #include "port.h"
28 #ifndef lint
29 __RCSID("$NetBSD: loop-linux2.c,v 1.3 2020/04/22 23:55:29 joerg Exp $");
30 #endif
31
32 #include <stdlib.h>
33 #include <strings.h>
34 #include <unistd.h>
35 #include <errno.h>
36 #if defined(__bsdi__) || defined(__FreeBSD__)
37 #include <sys/time.h>
38 #endif
39 #include <sys/ioctl.h>
40
41 #include "os.h"
42 #include "common.h"
43 #include "mopdef.h"
44
45 int
mopOpenRC(struct if_info * p,int trans)46 mopOpenRC(struct if_info *p, int trans)
47 {
48 #ifndef NORC
49 return (*(p->iopen))(p->if_name,
50 O_RDWR,
51 MOP_K_PROTO_RC,
52 trans);
53 #else
54 return -1;
55 #endif
56 }
57
58 int
mopOpenDL(struct if_info * p,int trans)59 mopOpenDL(struct if_info *p, int trans)
60 {
61 #ifndef NODL
62 return (*(p->iopen))(p->if_name,
63 O_RDWR,
64 MOP_K_PROTO_DL,
65 trans);
66 #else
67 return -1;
68 #endif
69 }
70
71 void
mopReadRC(void)72 mopReadRC(void)
73 {
74 }
75
76 void
mopReadDL(void)77 mopReadDL(void)
78 {
79 }
80
81 /*
82 * The list of all interfaces that are being listened to. loop()
83 * "selects" on the descriptors in this list.
84 */
85 extern struct if_info *iflist;
86
87 void mopProcess(struct if_info *, u_char *);
88
89 /*
90 * Loop indefinitely listening for MOP requests on the
91 * interfaces in 'iflist'.
92 */
93 void
Loop(void)94 Loop(void)
95 {
96 u_char *buf, *bp, *ep;
97 int cc;
98 fd_set fds, listeners;
99 int bufsize = 1100, maxfd =0;
100 struct if_info *ii;
101
102
103 if (iflist == 0) {
104 syslog(LOG_ERR, "no interfaces");
105 exit(0);
106 }
107
108 buf = (u_char *) malloc((unsigned) bufsize);
109
110 if (buf == 0) {
111 syslog(LOG_ERR, "malloc: %m");
112 exit(0);
113 }
114 /*
115 * Find the highest numbered file descriptor for select().
116 * Initialize the set of descriptors to listen to.
117 */
118 FD_ZERO(&fds);
119 for (ii = iflist; ii; ii = ii->next) {
120 if (ii->fd != -1) {
121 FD_SET(ii->fd, &fds);
122 if (ii->fd > maxfd)
123 maxfd = ii->fd;
124 }
125 }
126 while (1) {
127 listeners = fds;
128 if (select(maxfd + 1, &listeners, (fd_set *) 0,
129 (fd_set *) 0, (struct timeval *) 0) < 0) {
130 syslog(LOG_ERR, "select: %m");
131 exit(0);
132 }
133 for (ii = iflist; ii; ii = ii->next) {
134 if (ii->fd != -1) {
135 if (!FD_ISSET(ii->fd, &listeners))
136 continue;
137 }
138 again:
139 cc = read(ii->fd, (char *) buf, bufsize);
140 /* Don't choke when we get ptraced */
141 if (cc < 0 && errno == EINTR)
142 goto again;
143
144 bp = buf;
145 ep = bp + cc;
146
147 if(bp < ep) {
148 mopProcess(ii,buf);
149 }
150
151 }
152 }
153 }
154