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 45int 46mopOpenRC(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 58int 59mopOpenDL(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 71void 72mopReadRC(void) 73{ 74} 75 76void 77mopReadDL(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 */ 85extern struct if_info *iflist; 86 87void mopProcess(struct if_info *, u_char *); 88 89/* 90 * Loop indefinitely listening for MOP requests on the 91 * interfaces in 'iflist'. 92 */ 93void 94Loop(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