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Annotation of 43BSDReno/sbin/XNSrouted/startup.c, revision 1.1

1.1     ! root        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: (1) source distributions retain this entire copyright
        !            10:  * notice and comment, and (2) distributions including binaries display
        !            11:  * the following acknowledgement:  ``This product includes software
        !            12:  * developed by the University of California, Berkeley and its contributors''
        !            13:  * in the documentation or other materials provided with the distribution
        !            14:  * and in all advertising materials mentioning features or use of this
        !            15:  * software. Neither the name of the University nor the names of its
        !            16:  * contributors may be used to endorse or promote products derived
        !            17:  * from this software without specific prior written permission.
        !            18:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            19:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            20:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            21:  */
        !            22: 
        !            23: #ifndef lint
        !            24: static char sccsid[] = "@(#)startup.c  5.9 (Berkeley) 6/1/90";
        !            25: #endif /* not lint */
        !            26: 
        !            27: /*
        !            28:  * Routing Table Management Daemon
        !            29:  */
        !            30: #include "defs.h"
        !            31: #include <sys/ioctl.h>
        !            32: #include <net/if.h>
        !            33: #include <nlist.h>
        !            34: #include <syslog.h>
        !            35: 
        !            36: struct interface *ifnet;
        !            37: int    lookforinterfaces = 1;
        !            38: int    performnlist = 1;
        !            39: int    gateway = 0;
        !            40: int    externalinterfaces = 0;         /* # of remote and local interfaces */
        !            41: char ether_broadcast_addr[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
        !            42: 
        !            43: 
        !            44: /*
        !            45:  * Find the network interfaces which have configured themselves.
        !            46:  * If the interface is present but not yet up (for example an
        !            47:  * ARPANET IMP), set the lookforinterfaces flag so we'll
        !            48:  * come back later and look again.
        !            49:  */
        !            50: ifinit()
        !            51: {
        !            52:        struct interface ifs, *ifp;
        !            53:        int s;
        !            54:         struct ifconf ifc;
        !            55:        char buf[BUFSIZ], *cp, *cplim;
        !            56:         struct ifreq ifreq, *ifr;
        !            57:        u_long i;
        !            58: 
        !            59:        if ((s = socket(AF_NS, SOCK_DGRAM, 0)) < 0) {
        !            60:                syslog(LOG_ERR, "socket: %m");
        !            61:                exit(1);
        !            62:        }
        !            63:         ifc.ifc_len = sizeof (buf);
        !            64:         ifc.ifc_buf = buf;
        !            65:         if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) {
        !            66:                 syslog(LOG_ERR, "ioctl (get interface configuration)");
        !            67:                close(s);
        !            68:                 exit(1);
        !            69:         }
        !            70:         ifr = ifc.ifc_req;
        !            71:        lookforinterfaces = 0;
        !            72: #ifdef RTM_ADD
        !            73: #define max(a, b) (a > b ? a : b)
        !            74: #define size(p)        max((p).sa_len, sizeof(p))
        !            75: #else
        !            76: #define size(p) (sizeof (p))
        !            77: #endif
        !            78:        cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */
        !            79:        for (cp = buf; cp < cplim;
        !            80:                        cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) {
        !            81:                bzero((char *)&ifs, sizeof(ifs));
        !            82:                ifs.int_addr = ifr->ifr_addr;
        !            83:                ifreq = *ifr;
        !            84:                 if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
        !            85:                         syslog(LOG_ERR, "ioctl (get interface flags)");
        !            86:                         continue;
        !            87:                 }
        !            88:                ifs.int_flags = ifreq.ifr_flags | IFF_INTERFACE;
        !            89:                if ((ifs.int_flags & IFF_UP) == 0 ||
        !            90:                    ifr->ifr_addr.sa_family == AF_UNSPEC) {
        !            91:                        lookforinterfaces = 1;
        !            92:                        continue;
        !            93:                }
        !            94:                if (ifs.int_addr.sa_family != AF_NS)
        !            95:                        continue;
        !            96:                 if (ifs.int_flags & IFF_POINTOPOINT) {
        !            97:                         if (ioctl(s, SIOCGIFDSTADDR, (char *)&ifreq) < 0) {
        !            98:                                 syslog(LOG_ERR, "ioctl (get dstaddr): %m");
        !            99:                                 continue;
        !           100:                        }
        !           101:                        ifs.int_dstaddr = ifreq.ifr_dstaddr;
        !           102:                }
        !           103:                 if (ifs.int_flags & IFF_BROADCAST) {
        !           104:                         if (ioctl(s, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {
        !           105:                                 syslog(LOG_ERR, "ioctl (get broadaddr: %m");
        !           106:                                 continue;
        !           107:                         }
        !           108:                        ifs.int_broadaddr = ifreq.ifr_broadaddr;
        !           109:                }
        !           110:                /* 
        !           111:                 * already known to us? 
        !           112:                 * what makes a POINTOPOINT if unique is its dst addr,
        !           113:                 * NOT its source address 
        !           114:                 */
        !           115:                if ( ((ifs.int_flags & IFF_POINTOPOINT) &&
        !           116:                        if_ifwithdstaddr(&ifs.int_dstaddr)) ||
        !           117:                        ( ((ifs.int_flags & IFF_POINTOPOINT) == 0) &&
        !           118:                        if_ifwithaddr(&ifs.int_addr)))
        !           119:                        continue;
        !           120:                /* no one cares about software loopback interfaces */
        !           121:                if (strncmp(ifr->ifr_name,"lo", 2)==0)
        !           122:                        continue;
        !           123:                ifp = (struct interface *)malloc(sizeof (struct interface));
        !           124:                if (ifp == 0) {
        !           125:                        syslog(LOG_ERR,"XNSrouted: out of memory\n");
        !           126:                        break;
        !           127:                }
        !           128:                *ifp = ifs;
        !           129:                /*
        !           130:                 * Count the # of directly connected networks
        !           131:                 * and point to point links which aren't looped
        !           132:                 * back to ourself.  This is used below to
        !           133:                 * decide if we should be a routing ``supplier''.
        !           134:                 */
        !           135:                if ((ifs.int_flags & IFF_POINTOPOINT) == 0 ||
        !           136:                    if_ifwithaddr(&ifs.int_dstaddr) == 0)
        !           137:                        externalinterfaces++;
        !           138:                /*
        !           139:                 * If we have a point-to-point link, we want to act
        !           140:                 * as a supplier even if it's our only interface,
        !           141:                 * as that's the only way our peer on the other end
        !           142:                 * can tell that the link is up.
        !           143:                 */
        !           144:                if ((ifs.int_flags & IFF_POINTOPOINT) && supplier < 0)
        !           145:                        supplier = 1;
        !           146:                ifp->int_name = malloc(strlen(ifr->ifr_name) + 1);
        !           147:                if (ifp->int_name == 0) {
        !           148:                        syslog(LOG_ERR,"XNSrouted: out of memory\n");
        !           149:                        exit(1);
        !           150:                }
        !           151:                strcpy(ifp->int_name, ifr->ifr_name);
        !           152:                ifp->int_metric = 0;
        !           153:                ifp->int_next = ifnet;
        !           154:                ifnet = ifp;
        !           155:                traceinit(ifp);
        !           156:                addrouteforif(ifp);
        !           157:        }
        !           158:        if (externalinterfaces > 1 && supplier < 0)
        !           159:                supplier = 1;
        !           160:        close(s);
        !           161: }
        !           162: 
        !           163: addrouteforif(ifp)
        !           164:        struct interface *ifp;
        !           165: {
        !           166:        struct sockaddr_ns net;
        !           167:        struct sockaddr *dst;
        !           168:        int state, metric;
        !           169:        struct rt_entry *rt;
        !           170: 
        !           171:        if (ifp->int_flags & IFF_POINTOPOINT) {
        !           172:                int (*match)();
        !           173:                register struct interface *ifp2 = ifnet;
        !           174:                register struct interface *ifprev = ifnet;
        !           175:                
        !           176:                dst = &ifp->int_dstaddr;
        !           177: 
        !           178:                /* Search for interfaces with the same net */
        !           179:                ifp->int_sq.n = ifp->int_sq.p = &(ifp->int_sq);
        !           180:                match = afswitch[dst->sa_family].af_netmatch;
        !           181:                if (match)
        !           182:                for (ifp2 = ifnet; ifp2; ifp2 =ifp2->int_next) {
        !           183:                        if (ifp->int_flags & IFF_POINTOPOINT == 0)
        !           184:                                continue;
        !           185:                        if ((*match)(&ifp2->int_dstaddr,&ifp->int_dstaddr)) {
        !           186:                                insque(&ifp2->int_sq,&ifp->int_sq);
        !           187:                                break;
        !           188:                        }
        !           189:                }
        !           190:        } else {
        !           191:                dst = &ifp->int_broadaddr;
        !           192:        }
        !           193:        rt = rtlookup(dst);
        !           194:        if (rt)
        !           195:                rtdelete(rt);
        !           196:        if (tracing)
        !           197:                fprintf(stderr, "Adding route to interface %s\n", ifp->int_name);
        !           198:        if (ifp->int_transitions++ > 0)
        !           199:                syslog(LOG_ERR, "re-installing interface %s", ifp->int_name);
        !           200:        rtadd(dst, &ifp->int_addr, ifp->int_metric,
        !           201:                ifp->int_flags & (IFF_INTERFACE|IFF_PASSIVE|IFF_REMOTE));
        !           202: }
        !           203: 

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