1 /* 2 * Copyright (c) 1985 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This file includes significant work done at Cornell University by 6 * Bill Nesheim. That work included by permission. 7 * 8 * Redistribution and use in source and binary forms are permitted 9 * provided that the above copyright notice and this paragraph are 10 * duplicated in all such forms and that any documentation, 11 * advertising materials, and other materials related to such 12 * distribution and use acknowledge that the software was developed 13 * by the University of California, Berkeley. The name of the 14 * University may not be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 19 */ 20 21 #ifndef lint 22 static char sccsid[] = "@(#)startup.c 5.6 (Berkeley) 09/19/88"; 23 #endif /* not lint */ 24 25 /* 26 * Routing Table Management Daemon 27 */ 28 #include "defs.h" 29 #include <sys/ioctl.h> 30 #include <net/if.h> 31 #include <nlist.h> 32 #include <syslog.h> 33 34 struct interface *ifnet; 35 int lookforinterfaces = 1; 36 int performnlist = 1; 37 int gateway = 0; 38 int externalinterfaces = 0; /* # of remote and local interfaces */ 39 char ether_broadcast_addr[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; 40 41 42 /* 43 * Find the network interfaces which have configured themselves. 44 * If the interface is present but not yet up (for example an 45 * ARPANET IMP), set the lookforinterfaces flag so we'll 46 * come back later and look again. 47 */ 48 ifinit() 49 { 50 struct interface ifs, *ifp; 51 int s, n; 52 struct ifconf ifc; 53 char buf[(sizeof (struct ifreq ) * 20)]; 54 struct ifreq ifreq, *ifr; 55 u_long i; 56 57 if ((s = socket(AF_NS, SOCK_DGRAM, 0)) < 0) { 58 syslog(LOG_ERR, "socket: %m"); 59 exit(1); 60 } 61 ifc.ifc_len = sizeof (buf); 62 ifc.ifc_buf = buf; 63 if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) { 64 syslog(LOG_ERR, "ioctl (get interface configuration)"); 65 close(s); 66 return (0); 67 } 68 ifr = ifc.ifc_req; 69 lookforinterfaces = 0; 70 for (n = ifc.ifc_len / sizeof (struct ifreq); n > 0; n--, ifr++) { 71 bzero((char *)&ifs, sizeof(ifs)); 72 ifs.int_addr = ifr->ifr_addr; 73 ifreq = *ifr; 74 if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) { 75 syslog(LOG_ERR, "ioctl (get interface flags)"); 76 continue; 77 } 78 ifs.int_flags = ifreq.ifr_flags | IFF_INTERFACE; 79 if ((ifs.int_flags & IFF_UP) == 0 || 80 ifr->ifr_addr.sa_family == AF_UNSPEC) { 81 lookforinterfaces = 1; 82 continue; 83 } 84 if (ifs.int_addr.sa_family != AF_NS) 85 continue; 86 if (ifs.int_flags & IFF_POINTOPOINT) { 87 if (ioctl(s, SIOCGIFDSTADDR, (char *)&ifreq) < 0) { 88 syslog(LOG_ERR, "ioctl (get dstaddr): %m"); 89 continue; 90 } 91 ifs.int_dstaddr = ifreq.ifr_dstaddr; 92 } 93 if (ifs.int_flags & IFF_BROADCAST) { 94 if (ioctl(s, SIOCGIFBRDADDR, (char *)&ifreq) < 0) { 95 syslog(LOG_ERR, "ioctl (get broadaddr: %m"); 96 continue; 97 } 98 ifs.int_broadaddr = ifreq.ifr_broadaddr; 99 } 100 /* 101 * already known to us? 102 * what makes a POINTOPOINT if unique is its dst addr, 103 * NOT its source address 104 */ 105 if ( ((ifs.int_flags & IFF_POINTOPOINT) && 106 if_ifwithdstaddr(&ifs.int_dstaddr)) || 107 ( ((ifs.int_flags & IFF_POINTOPOINT) == 0) && 108 if_ifwithaddr(&ifs.int_addr))) 109 continue; 110 /* no one cares about software loopback interfaces */ 111 if (strncmp(ifr->ifr_name,"lo", 2)==0) 112 continue; 113 ifp = (struct interface *)malloc(sizeof (struct interface)); 114 if (ifp == 0) { 115 syslog(LOG_ERR,"XNSrouted: out of memory\n"); 116 break; 117 } 118 *ifp = ifs; 119 /* 120 * Count the # of directly connected networks 121 * and point to point links which aren't looped 122 * back to ourself. This is used below to 123 * decide if we should be a routing ``supplier''. 124 */ 125 if ((ifs.int_flags & IFF_POINTOPOINT) == 0 || 126 if_ifwithaddr(&ifs.int_dstaddr) == 0) 127 externalinterfaces++; 128 /* 129 * If we have a point-to-point link, we want to act 130 * as a supplier even if it's our only interface, 131 * as that's the only way our peer on the other end 132 * can tell that the link is up. 133 */ 134 if ((ifs.int_flags & IFF_POINTOPOINT) && supplier < 0) 135 supplier = 1; 136 ifp->int_name = malloc(strlen(ifr->ifr_name) + 1); 137 if (ifp->int_name == 0) { 138 syslog(LOG_ERR,"XNSrouted: out of memory\n"); 139 goto bad; /* ??? */ 140 } 141 strcpy(ifp->int_name, ifr->ifr_name); 142 ifp->int_metric = 0; 143 ifp->int_next = ifnet; 144 ifnet = ifp; 145 traceinit(ifp); 146 addrouteforif(ifp); 147 } 148 if (externalinterfaces > 1 && supplier < 0) 149 supplier = 1; 150 close(s); 151 return; 152 bad: 153 sleep(60); 154 close(s); 155 sleep(60); 156 execv("/etc/XNSrouted", argv0); 157 _exit(0177); 158 } 159 160 addrouteforif(ifp) 161 struct interface *ifp; 162 { 163 struct sockaddr_ns net; 164 struct sockaddr *dst; 165 int state, metric; 166 struct rt_entry *rt; 167 168 if (ifp->int_flags & IFF_POINTOPOINT) { 169 int (*match)(); 170 register struct interface *ifp2 = ifnet; 171 register struct interface *ifprev = ifnet; 172 173 dst = &ifp->int_dstaddr; 174 175 /* Search for interfaces with the same net */ 176 ifp->int_sq.n = ifp->int_sq.p = &(ifp->int_sq); 177 match = afswitch[dst->sa_family].af_netmatch; 178 if (match) 179 for (ifp2 = ifnet; ifp2; ifp2 =ifp2->int_next) { 180 if (ifp->int_flags & IFF_POINTOPOINT == 0) 181 continue; 182 if ((*match)(&ifp2->int_dstaddr,&ifp->int_dstaddr)) { 183 insque(&ifp2->int_sq,&ifp->int_sq); 184 break; 185 } 186 } 187 } else { 188 dst = &ifp->int_broadaddr; 189 } 190 rt = rtlookup(dst); 191 if (rt) 192 rtdelete(rt); 193 if (tracing) 194 fprintf(stderr, "Adding route to interface %s\n", ifp->int_name); 195 if (ifp->int_transitions++ > 0) 196 syslog(LOG_ERR, "re-installing interface %s", ifp->int_name); 197 rtadd(dst, &ifp->int_addr, ifp->int_metric, 198 ifp->int_flags & (IFF_INTERFACE|IFF_PASSIVE|IFF_REMOTE)); 199 } 200 201