Net2/usr/src/sbin/XNSrouted/startup.c
/*
* Copyright (c) 1985 The Regents of the University of California.
* All rights reserved.
*
* This file includes significant work done at Cornell University by
* Bill Nesheim. That work included by permission.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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 sccsid[] = "@(#)startup.c 5.11 (Berkeley) 2/26/91";
#endif /* not lint */
/*
* Routing Table Management Daemon
*/
#include "defs.h"
#include <sys/ioctl.h>
#include <net/if.h>
#include <nlist.h>
#include <stdlib.h>
struct interface *ifnet;
int lookforinterfaces = 1;
int performnlist = 1;
int gateway = 0;
int externalinterfaces = 0; /* # of remote and local interfaces */
char ether_broadcast_addr[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
/*
* Find the network interfaces which have configured themselves.
* If the interface is present but not yet up (for example an
* ARPANET IMP), set the lookforinterfaces flag so we'll
* come back later and look again.
*/
ifinit()
{
struct interface ifs, *ifp;
int s;
struct ifconf ifc;
char buf[BUFSIZ], *cp, *cplim;
struct ifreq ifreq, *ifr;
u_long i;
if ((s = socket(AF_NS, SOCK_DGRAM, 0)) < 0) {
syslog(LOG_ERR, "socket: %m");
exit(1);
}
ifc.ifc_len = sizeof (buf);
ifc.ifc_buf = buf;
if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) {
syslog(LOG_ERR, "ioctl (get interface configuration)");
close(s);
exit(1);
}
ifr = ifc.ifc_req;
lookforinterfaces = 0;
#ifdef RTM_ADD
#define max(a, b) (a > b ? a : b)
#define size(p) max((p).sa_len, sizeof(p))
#else
#define size(p) (sizeof (p))
#endif
cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */
for (cp = buf; cp < cplim;
cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) {
ifr = (struct ifreq *)cp;
bzero((char *)&ifs, sizeof(ifs));
ifs.int_addr = ifr->ifr_addr;
ifreq = *ifr;
if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
syslog(LOG_ERR, "ioctl (get interface flags)");
continue;
}
ifs.int_flags = ifreq.ifr_flags | IFF_INTERFACE;
if ((ifs.int_flags & IFF_UP) == 0 ||
ifr->ifr_addr.sa_family == AF_UNSPEC) {
lookforinterfaces = 1;
continue;
}
if (ifs.int_addr.sa_family != AF_NS)
continue;
if (ifs.int_flags & IFF_POINTOPOINT) {
if (ioctl(s, SIOCGIFDSTADDR, (char *)&ifreq) < 0) {
syslog(LOG_ERR, "ioctl (get dstaddr): %m");
continue;
}
ifs.int_dstaddr = ifreq.ifr_dstaddr;
}
if (ifs.int_flags & IFF_BROADCAST) {
if (ioctl(s, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {
syslog(LOG_ERR, "ioctl (get broadaddr: %m");
continue;
}
ifs.int_broadaddr = ifreq.ifr_broadaddr;
}
/*
* already known to us?
* what makes a POINTOPOINT if unique is its dst addr,
* NOT its source address
*/
if ( ((ifs.int_flags & IFF_POINTOPOINT) &&
if_ifwithdstaddr(&ifs.int_dstaddr)) ||
( ((ifs.int_flags & IFF_POINTOPOINT) == 0) &&
if_ifwithaddr(&ifs.int_addr)))
continue;
/* no one cares about software loopback interfaces */
if (strncmp(ifr->ifr_name,"lo", 2)==0)
continue;
ifp = (struct interface *)malloc(sizeof (struct interface));
if (ifp == 0) {
syslog(LOG_ERR,"XNSrouted: out of memory\n");
break;
}
*ifp = ifs;
/*
* Count the # of directly connected networks
* and point to point links which aren't looped
* back to ourself. This is used below to
* decide if we should be a routing ``supplier''.
*/
if ((ifs.int_flags & IFF_POINTOPOINT) == 0 ||
if_ifwithaddr(&ifs.int_dstaddr) == 0)
externalinterfaces++;
/*
* If we have a point-to-point link, we want to act
* as a supplier even if it's our only interface,
* as that's the only way our peer on the other end
* can tell that the link is up.
*/
if ((ifs.int_flags & IFF_POINTOPOINT) && supplier < 0)
supplier = 1;
ifp->int_name = malloc(strlen(ifr->ifr_name) + 1);
if (ifp->int_name == 0) {
syslog(LOG_ERR,"XNSrouted: out of memory\n");
exit(1);
}
strcpy(ifp->int_name, ifr->ifr_name);
ifp->int_metric = 0;
ifp->int_next = ifnet;
ifnet = ifp;
traceinit(ifp);
addrouteforif(ifp);
}
if (externalinterfaces > 1 && supplier < 0)
supplier = 1;
close(s);
}
addrouteforif(ifp)
struct interface *ifp;
{
struct sockaddr_ns net;
struct sockaddr *dst;
int state, metric;
struct rt_entry *rt;
if (ifp->int_flags & IFF_POINTOPOINT) {
int (*match)();
register struct interface *ifp2 = ifnet;
register struct interface *ifprev = ifnet;
dst = &ifp->int_dstaddr;
/* Search for interfaces with the same net */
ifp->int_sq.n = ifp->int_sq.p = &(ifp->int_sq);
match = afswitch[dst->sa_family].af_netmatch;
if (match)
for (ifp2 = ifnet; ifp2; ifp2 =ifp2->int_next) {
if (ifp->int_flags & IFF_POINTOPOINT == 0)
continue;
if ((*match)(&ifp2->int_dstaddr,&ifp->int_dstaddr)) {
insque(&ifp2->int_sq,&ifp->int_sq);
break;
}
}
} else {
dst = &ifp->int_broadaddr;
}
rt = rtlookup(dst);
if (rt)
rtdelete(rt);
if (tracing)
fprintf(stderr, "Adding route to interface %s\n", ifp->int_name);
if (ifp->int_transitions++ > 0)
syslog(LOG_ERR, "re-installing interface %s", ifp->int_name);
rtadd(dst, &ifp->int_addr, ifp->int_metric,
ifp->int_flags & (IFF_INTERFACE|IFF_PASSIVE|IFF_REMOTE));
}