489 lines
15 KiB
C
489 lines
15 KiB
C
/*
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* Copyright (c) 1983, 1988 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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/*static char sccsid[] = "from: @(#)startup.c 5.19 (Berkeley) 2/28/91";*/
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static char rcsid[] = "$Id: startup.c,v 1.5 1993/12/11 01:47:32 cgd Exp $";
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#endif /* not lint */
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/*
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* Routing Table Management Daemon
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*/
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#include "defs.h"
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <syslog.h>
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#include <stdlib.h>
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#include "pathnames.h"
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struct interface *ifnet;
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struct interface **ifnext = &ifnet;
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int lookforinterfaces = 1;
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int externalinterfaces = 0; /* # of remote and local interfaces */
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int foundloopback; /* valid flag for loopaddr */
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struct sockaddr loopaddr; /* our address on loopback */
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/*
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* Find the network interfaces which have configured themselves.
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* If the interface is present but not yet up (for example an
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* ARPANET IMP), set the lookforinterfaces flag so we'll
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* come back later and look again.
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*/
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ifinit()
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{
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struct interface ifs, *ifp;
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int s;
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char buf[BUFSIZ], *cp, *cplim;
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struct ifconf ifc;
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struct ifreq ifreq, *ifr;
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struct sockaddr_in *sin;
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u_long i;
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if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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syslog(LOG_ERR, "socket: %m");
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close(s);
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return;
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}
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ifc.ifc_len = sizeof (buf);
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ifc.ifc_buf = buf;
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if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) {
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syslog(LOG_ERR, "ioctl (get interface configuration)");
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close(s);
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return;
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}
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ifr = ifc.ifc_req;
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lookforinterfaces = 0;
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#ifdef RTM_ADD
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#define max(a, b) (a > b ? a : b)
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#define size(p) max((p).sa_len, sizeof(p))
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#else
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#define size(p) (sizeof (p))
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#endif
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cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */
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for (cp = buf; cp < cplim;
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cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) {
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ifr = (struct ifreq *)cp;
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bzero((char *)&ifs, sizeof(ifs));
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ifs.int_addr = ifr->ifr_addr;
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ifreq = *ifr;
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if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
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syslog(LOG_ERR, "%s: ioctl (get interface flags)",
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ifr->ifr_name);
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continue;
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}
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ifs.int_flags =
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(ifreq.ifr_flags & IFF_FLAGMASK) | IFF_INTERFACE;
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if ((ifs.int_flags & IFF_UP) == 0 ||
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ifr->ifr_addr.sa_family == AF_UNSPEC) {
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lookforinterfaces = 1;
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continue;
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}
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/* argh, this'll have to change sometime */
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if (ifs.int_addr.sa_family != AF_INET)
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continue;
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if (ifs.int_flags & IFF_POINTOPOINT) {
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if (ioctl(s, SIOCGIFDSTADDR, (char *)&ifreq) < 0) {
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syslog(LOG_ERR, "%s: ioctl (get dstaddr)",
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ifr->ifr_name);
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continue;
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}
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if (ifr->ifr_addr.sa_family == AF_UNSPEC) {
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lookforinterfaces = 1;
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continue;
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}
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ifs.int_dstaddr = ifreq.ifr_dstaddr;
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}
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/*
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* already known to us?
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* This allows multiple point-to-point links
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* to share a source address (possibly with one
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* other link), but assumes that there will not be
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* multiple links with the same destination address.
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*/
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if (ifs.int_flags & IFF_POINTOPOINT) {
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if (if_ifwithdstaddr(&ifs.int_dstaddr))
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continue;
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} else if (if_ifwithaddr(&ifs.int_addr))
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continue;
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if (ifs.int_flags & IFF_LOOPBACK) {
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ifs.int_flags |= IFF_PASSIVE;
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foundloopback = 1;
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loopaddr = ifs.int_addr;
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for (ifp = ifnet; ifp; ifp = ifp->int_next)
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if (ifp->int_flags & IFF_POINTOPOINT)
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add_ptopt_localrt(ifp);
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}
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if (ifs.int_flags & IFF_BROADCAST) {
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if (ioctl(s, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {
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syslog(LOG_ERR, "%s: ioctl (get broadaddr)",
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ifr->ifr_name);
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continue;
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}
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#ifndef sun
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ifs.int_broadaddr = ifreq.ifr_broadaddr;
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#else
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ifs.int_broadaddr = ifreq.ifr_addr;
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#endif
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}
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#ifdef SIOCGIFMETRIC
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if (ioctl(s, SIOCGIFMETRIC, (char *)&ifreq) < 0) {
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syslog(LOG_ERR, "%s: ioctl (get metric)",
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ifr->ifr_name);
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ifs.int_metric = 0;
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} else
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ifs.int_metric = ifreq.ifr_metric;
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#else
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ifs.int_metric = 0;
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#endif
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/*
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* Use a minimum metric of one;
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* treat the interface metric (default 0)
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* as an increment to the hop count of one.
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*/
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ifs.int_metric++;
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if (ioctl(s, SIOCGIFNETMASK, (char *)&ifreq) < 0) {
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syslog(LOG_ERR, "%s: ioctl (get netmask)",
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ifr->ifr_name);
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continue;
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}
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sin = (struct sockaddr_in *)&ifreq.ifr_addr;
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ifs.int_subnetmask = ntohl(sin->sin_addr.s_addr);
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sin = (struct sockaddr_in *)&ifs.int_addr;
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i = ntohl(sin->sin_addr.s_addr);
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if (IN_CLASSA(i))
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ifs.int_netmask = IN_CLASSA_NET;
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else if (IN_CLASSB(i))
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ifs.int_netmask = IN_CLASSB_NET;
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else
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ifs.int_netmask = IN_CLASSC_NET;
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ifs.int_net = i & ifs.int_netmask;
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ifs.int_subnet = i & ifs.int_subnetmask;
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if (ifs.int_subnetmask != ifs.int_netmask)
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ifs.int_flags |= IFF_SUBNET;
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ifp = (struct interface *)malloc(sizeof (struct interface));
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if (ifp == 0) {
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printf("routed: out of memory\n");
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break;
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}
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*ifp = ifs;
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/*
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* Count the # of directly connected networks
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* and point to point links which aren't looped
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* back to ourself. This is used below to
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* decide if we should be a routing ``supplier''.
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*/
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if ((ifs.int_flags & IFF_LOOPBACK) == 0 &&
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((ifs.int_flags & IFF_POINTOPOINT) == 0 ||
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if_ifwithaddr(&ifs.int_dstaddr) == 0))
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externalinterfaces++;
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/*
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* If we have a point-to-point link, we want to act
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* as a supplier even if it's our only interface,
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* as that's the only way our peer on the other end
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* can tell that the link is up.
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*/
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if ((ifs.int_flags & IFF_POINTOPOINT) && supplier < 0)
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supplier = 1;
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ifp->int_name = malloc(strlen(ifr->ifr_name) + 1);
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if (ifp->int_name == 0) {
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fprintf(stderr, "routed: ifinit: out of memory\n");
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syslog(LOG_ERR, "routed: ifinit: out of memory\n");
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close(s);
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return;
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}
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strcpy(ifp->int_name, ifr->ifr_name);
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*ifnext = ifp;
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ifnext = &ifp->int_next;
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traceinit(ifp);
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addrouteforif(ifp);
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}
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if (externalinterfaces > 1 && supplier < 0)
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supplier = 1;
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close(s);
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}
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/*
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* Add route for interface if not currently installed.
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* Create route to other end if a point-to-point link,
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* otherwise a route to this (sub)network.
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* INTERNET SPECIFIC.
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*/
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addrouteforif(ifp)
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register struct interface *ifp;
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{
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struct sockaddr_in net;
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struct sockaddr *dst;
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int state;
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register struct rt_entry *rt;
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if (ifp->int_flags & IFF_POINTOPOINT)
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dst = &ifp->int_dstaddr;
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else {
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bzero((char *)&net, sizeof (net));
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net.sin_family = AF_INET;
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net.sin_addr = inet_makeaddr(ifp->int_subnet, INADDR_ANY);
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dst = (struct sockaddr *)&net;
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}
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rt = rtfind(dst);
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if (rt &&
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(rt->rt_state & (RTS_INTERFACE | RTS_INTERNAL)) == RTS_INTERFACE)
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return;
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if (rt)
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rtdelete(rt);
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/*
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* If interface on subnetted network,
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* install route to network as well.
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* This is meant for external viewers.
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*/
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if ((ifp->int_flags & (IFF_SUBNET|IFF_POINTOPOINT)) == IFF_SUBNET) {
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struct in_addr subnet;
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subnet = net.sin_addr;
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net.sin_addr = inet_makeaddr(ifp->int_net, INADDR_ANY);
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rt = rtfind(dst);
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if (rt == 0)
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rtadd(dst, &ifp->int_addr, ifp->int_metric,
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((ifp->int_flags & (IFF_INTERFACE|IFF_REMOTE)) |
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RTS_PASSIVE | RTS_INTERNAL | RTS_SUBNET));
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else if ((rt->rt_state & (RTS_INTERNAL|RTS_SUBNET)) ==
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(RTS_INTERNAL|RTS_SUBNET) &&
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ifp->int_metric < rt->rt_metric)
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rtchange(rt, &rt->rt_router, ifp->int_metric);
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net.sin_addr = subnet;
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}
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if (ifp->int_transitions++ > 0)
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syslog(LOG_ERR, "re-installing interface %s", ifp->int_name);
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state = ifp->int_flags &
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(IFF_INTERFACE | IFF_PASSIVE | IFF_REMOTE | IFF_SUBNET);
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if (ifp->int_flags & IFF_POINTOPOINT &&
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(ntohl(((struct sockaddr_in *)&ifp->int_dstaddr)->sin_addr.s_addr) &
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ifp->int_netmask) != ifp->int_net)
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state &= ~RTS_SUBNET;
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if (ifp->int_flags & IFF_LOOPBACK)
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state |= RTS_EXTERNAL;
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rtadd(dst, &ifp->int_addr, ifp->int_metric, state);
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if (ifp->int_flags & IFF_POINTOPOINT && foundloopback)
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add_ptopt_localrt(ifp);
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}
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/*
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* Add route to local end of point-to-point using loopback.
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* If a route to this network is being sent to neighbors on other nets,
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* mark this route as subnet so we don't have to propagate it too.
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*/
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add_ptopt_localrt(ifp)
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register struct interface *ifp;
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{
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struct rt_entry *rt;
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struct sockaddr *dst;
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struct sockaddr_in net;
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int state;
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state = RTS_INTERFACE | RTS_PASSIVE;
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/* look for route to logical network */
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bzero((char *)&net, sizeof (net));
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net.sin_family = AF_INET;
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net.sin_addr = inet_makeaddr(ifp->int_net, INADDR_ANY);
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dst = (struct sockaddr *)&net;
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rt = rtfind(dst);
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if (rt && rt->rt_state & RTS_INTERNAL)
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state |= RTS_SUBNET;
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dst = &ifp->int_addr;
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if (rt = rtfind(dst)) {
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if (rt && rt->rt_state & RTS_INTERFACE)
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return;
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rtdelete(rt);
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}
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rtadd(dst, &loopaddr, 1, state);
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}
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/*
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* As a concession to the ARPANET we read a list of gateways
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* from /etc/gateways and add them to our tables. This file
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* exists at each ARPANET gateway and indicates a set of ``remote''
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* gateways (i.e. a gateway which we can't immediately determine
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* if it's present or not as we can do for those directly connected
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* at the hardware level). If a gateway is marked ``passive''
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* in the file, then we assume it doesn't have a routing process
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* of our design and simply assume it's always present. Those
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* not marked passive are treated as if they were directly
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* connected -- they're added into the interface list so we'll
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* send them routing updates.
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*
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* PASSIVE ENTRIES AREN'T NEEDED OR USED ON GATEWAYS RUNNING EGP.
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*/
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gwkludge()
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{
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struct sockaddr_in dst, gate;
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FILE *fp;
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char *type, *dname, *gname, *qual, buf[BUFSIZ];
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struct interface *ifp;
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int metric, n;
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struct rt_entry route;
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fp = fopen(_PATH_GATEWAYS, "r");
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if (fp == NULL)
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return;
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qual = buf;
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dname = buf + 64;
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gname = buf + ((BUFSIZ - 64) / 3);
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type = buf + (((BUFSIZ - 64) * 2) / 3);
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bzero((char *)&dst, sizeof (dst));
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bzero((char *)&gate, sizeof (gate));
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bzero((char *)&route, sizeof(route));
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/* format: {net | host} XX gateway XX metric DD [passive | external]\n */
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#define readentry(fp) \
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fscanf((fp), "%s %s gateway %s metric %d %s\n", \
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type, dname, gname, &metric, qual)
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for (;;) {
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if ((n = readentry(fp)) == EOF)
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break;
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if (!getnetorhostname(type, dname, &dst))
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continue;
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if (!gethostnameornumber(gname, &gate))
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continue;
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if (metric == 0) /* XXX */
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metric = 1;
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if (strcmp(qual, "passive") == 0) {
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/*
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* Passive entries aren't placed in our tables,
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* only the kernel's, so we don't copy all of the
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* external routing information within a net.
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* Internal machines should use the default
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* route to a suitable gateway (like us).
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*/
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route.rt_dst = *(struct sockaddr *) &dst;
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route.rt_router = *(struct sockaddr *) &gate;
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route.rt_flags = RTF_UP;
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if (strcmp(type, "host") == 0)
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route.rt_flags |= RTF_HOST;
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if (metric)
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route.rt_flags |= RTF_GATEWAY;
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(void) ioctl(s, SIOCADDRT, (char *)&route.rt_rt);
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continue;
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}
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if (strcmp(qual, "external") == 0) {
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/*
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* Entries marked external are handled
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* by other means, e.g. EGP,
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* and are placed in our tables only
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* to prevent overriding them
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* with something else.
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*/
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rtadd(&dst, &gate, metric, RTS_EXTERNAL|RTS_PASSIVE);
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continue;
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}
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/* assume no duplicate entries */
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externalinterfaces++;
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ifp = (struct interface *)malloc(sizeof (*ifp));
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bzero((char *)ifp, sizeof (*ifp));
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ifp->int_flags = IFF_REMOTE;
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/* can't identify broadcast capability */
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ifp->int_net = inet_netof(dst.sin_addr);
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if (strcmp(type, "host") == 0) {
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ifp->int_flags |= IFF_POINTOPOINT;
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ifp->int_dstaddr = *((struct sockaddr *)&dst);
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}
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ifp->int_addr = *((struct sockaddr *)&gate);
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ifp->int_metric = metric;
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ifp->int_next = ifnet;
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ifnet = ifp;
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addrouteforif(ifp);
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}
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fclose(fp);
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}
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getnetorhostname(type, name, sin)
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char *type, *name;
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struct sockaddr_in *sin;
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{
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if (strcmp(type, "net") == 0) {
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struct netent *np = getnetbyname(name);
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int n;
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if (np == 0)
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n = inet_network(name);
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else {
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if (np->n_addrtype != AF_INET)
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return (0);
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n = np->n_net;
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/*
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* getnetbyname returns right-adjusted value.
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*/
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if (n < 128)
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n <<= IN_CLASSA_NSHIFT;
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else if (n < 65536)
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n <<= IN_CLASSB_NSHIFT;
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else
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n <<= IN_CLASSC_NSHIFT;
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}
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sin->sin_family = AF_INET;
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sin->sin_addr = inet_makeaddr(n, INADDR_ANY);
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return (1);
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}
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if (strcmp(type, "host") == 0) {
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struct hostent *hp = gethostbyname(name);
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if (hp == 0)
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sin->sin_addr.s_addr = inet_addr(name);
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else {
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if (hp->h_addrtype != AF_INET)
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return (0);
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bcopy(hp->h_addr, &sin->sin_addr, hp->h_length);
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}
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sin->sin_family = AF_INET;
|
|
return (1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
gethostnameornumber(name, sin)
|
|
char *name;
|
|
struct sockaddr_in *sin;
|
|
{
|
|
struct hostent *hp;
|
|
|
|
hp = gethostbyname(name);
|
|
if (hp) {
|
|
bcopy(hp->h_addr, &sin->sin_addr, hp->h_length);
|
|
sin->sin_family = hp->h_addrtype;
|
|
return (1);
|
|
}
|
|
sin->sin_addr.s_addr = inet_addr(name);
|
|
sin->sin_family = AF_INET;
|
|
return (sin->sin_addr.s_addr != -1);
|
|
}
|