/* * 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 const char rcsid[] = "$Id: loop-linux2.c,v 1.4 2003/12/01 00:56:51 avsm Exp $"; #endif #include #include #include #if defined(__bsdi__) || defined(__FreeBSD__) #include #endif #include #include #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 = 1100, maxfd =0; struct if_info *ii; /* FIXME : this is a hack, for some reason specifying an interface would * cause it to fail because bufsize is an impossible number, so I added a * sanity check because I'm too lazy to figure out why. -- Karl */ if (bufsize > 1100) bufsize = 64; if (iflist == 0) { syslog(LOG_ERR, "no interfaces"); 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; bp = buf; ep = bp + cc; if(bp < ep) { mopProcess(ii,buf); } } } }