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1.1 root 1: /*
2: * Copyright (c) 1983, 1988 Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms are permitted
6: * provided that: (1) source distributions retain this entire copyright
7: * notice and comment, and (2) distributions including binaries display
8: * the following acknowledgement: ``This product includes software
9: * developed by the University of California, Berkeley and its contributors''
10: * in the documentation or other materials provided with the distribution
11: * and in all advertising materials mentioning features or use of this
12: * software. Neither the name of the University nor the names of its
13: * contributors may be used to endorse or promote products derived
14: * from this software without specific prior written permission.
15: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
16: * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
17: * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
18: */
19:
20: #ifndef lint
21: static char sccsid[] = "@(#)startup.c 5.18 (Berkeley) 6/1/90";
22: #endif /* not lint */
23:
24: /*
25: * Routing Table Management Daemon
26: */
27: #include "defs.h"
28: #include <sys/ioctl.h>
29: #include <net/if.h>
30: #include <syslog.h>
31: #include "pathnames.h"
32:
33: struct interface *ifnet;
34: struct interface **ifnext = &ifnet;
35: int lookforinterfaces = 1;
36: int externalinterfaces = 0; /* # of remote and local interfaces */
37: int foundloopback; /* valid flag for loopaddr */
38: struct sockaddr loopaddr; /* our address on loopback */
39:
40: /*
41: * Find the network interfaces which have configured themselves.
42: * If the interface is present but not yet up (for example an
43: * ARPANET IMP), set the lookforinterfaces flag so we'll
44: * come back later and look again.
45: */
46: ifinit()
47: {
48: struct interface ifs, *ifp;
49: int s;
50: char buf[BUFSIZ], *cp, *cplim;
51: struct ifconf ifc;
52: struct ifreq ifreq, *ifr;
53: struct sockaddr_in *sin;
54: u_long i;
55:
56: if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
57: syslog(LOG_ERR, "socket: %m");
58: close(s);
59: return;
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;
67: }
68: ifr = ifc.ifc_req;
69: lookforinterfaces = 0;
70: #ifdef RTM_ADD
71: #define max(a, b) (a > b ? a : b)
72: #define size(p) max((p).sa_len, sizeof(p))
73: #else
74: #define size(p) (sizeof (p))
75: #endif
76: cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */
77: for (cp = buf; cp < cplim;
78: cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) {
79: ifr = (struct ifreq *)cp;
80: bzero((char *)&ifs, sizeof(ifs));
81: ifs.int_addr = ifr->ifr_addr;
82: ifreq = *ifr;
83: if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
84: syslog(LOG_ERR, "%s: ioctl (get interface flags)",
85: ifr->ifr_name);
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: /* argh, this'll have to change sometime */
95: if (ifs.int_addr.sa_family != AF_INET)
96: continue;
97: if (ifs.int_flags & IFF_POINTOPOINT) {
98: if (ioctl(s, SIOCGIFDSTADDR, (char *)&ifreq) < 0) {
99: syslog(LOG_ERR, "%s: ioctl (get dstaddr)",
100: ifr->ifr_name);
101: continue;
102: }
103: if (ifr->ifr_addr.sa_family == AF_UNSPEC) {
104: lookforinterfaces = 1;
105: continue;
106: }
107: ifs.int_dstaddr = ifreq.ifr_dstaddr;
108: }
109: /*
110: * already known to us?
111: * This allows multiple point-to-point links
112: * to share a source address (possibly with one
113: * other link), but assumes that there will not be
114: * multiple links with the same destination address.
115: */
116: if (ifs.int_flags & IFF_POINTOPOINT) {
117: if (if_ifwithdstaddr(&ifs.int_dstaddr))
118: continue;
119: } else if (if_ifwithaddr(&ifs.int_addr))
120: continue;
121: if (ifs.int_flags & IFF_LOOPBACK) {
122: ifs.int_flags |= IFF_PASSIVE;
123: foundloopback = 1;
124: loopaddr = ifs.int_addr;
125: for (ifp = ifnet; ifp; ifp = ifp->int_next)
126: if (ifp->int_flags & IFF_POINTOPOINT)
127: add_ptopt_localrt(ifp);
128: }
129: if (ifs.int_flags & IFF_BROADCAST) {
130: if (ioctl(s, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {
131: syslog(LOG_ERR, "%s: ioctl (get broadaddr)",
132: ifr->ifr_name);
133: continue;
134: }
135: #ifndef sun
136: ifs.int_broadaddr = ifreq.ifr_broadaddr;
137: #else
138: ifs.int_broadaddr = ifreq.ifr_addr;
139: #endif
140: }
141: #ifdef SIOCGIFMETRIC
142: if (ioctl(s, SIOCGIFMETRIC, (char *)&ifreq) < 0) {
143: syslog(LOG_ERR, "%s: ioctl (get metric)",
144: ifr->ifr_name);
145: ifs.int_metric = 0;
146: } else
147: ifs.int_metric = ifreq.ifr_metric;
148: #else
149: ifs.int_metric = 0;
150: #endif
151: /*
152: * Use a minimum metric of one;
153: * treat the interface metric (default 0)
154: * as an increment to the hop count of one.
155: */
156: ifs.int_metric++;
157: if (ioctl(s, SIOCGIFNETMASK, (char *)&ifreq) < 0) {
158: syslog(LOG_ERR, "%s: ioctl (get netmask)",
159: ifr->ifr_name);
160: continue;
161: }
162: sin = (struct sockaddr_in *)&ifreq.ifr_addr;
163: ifs.int_subnetmask = ntohl(sin->sin_addr.s_addr);
164: sin = (struct sockaddr_in *)&ifs.int_addr;
165: i = ntohl(sin->sin_addr.s_addr);
166: if (IN_CLASSA(i))
167: ifs.int_netmask = IN_CLASSA_NET;
168: else if (IN_CLASSB(i))
169: ifs.int_netmask = IN_CLASSB_NET;
170: else
171: ifs.int_netmask = IN_CLASSC_NET;
172: ifs.int_net = i & ifs.int_netmask;
173: ifs.int_subnet = i & ifs.int_subnetmask;
174: if (ifs.int_subnetmask != ifs.int_netmask)
175: ifs.int_flags |= IFF_SUBNET;
176: ifp = (struct interface *)malloc(sizeof (struct interface));
177: if (ifp == 0) {
178: printf("routed: out of memory\n");
179: break;
180: }
181: *ifp = ifs;
182: /*
183: * Count the # of directly connected networks
184: * and point to point links which aren't looped
185: * back to ourself. This is used below to
186: * decide if we should be a routing ``supplier''.
187: */
188: if ((ifs.int_flags & IFF_LOOPBACK) == 0 &&
189: ((ifs.int_flags & IFF_POINTOPOINT) == 0 ||
190: if_ifwithaddr(&ifs.int_dstaddr) == 0))
191: externalinterfaces++;
192: /*
193: * If we have a point-to-point link, we want to act
194: * as a supplier even if it's our only interface,
195: * as that's the only way our peer on the other end
196: * can tell that the link is up.
197: */
198: if ((ifs.int_flags & IFF_POINTOPOINT) && supplier < 0)
199: supplier = 1;
200: ifp->int_name = malloc(strlen(ifr->ifr_name) + 1);
201: if (ifp->int_name == 0) {
202: fprintf(stderr, "routed: ifinit: out of memory\n");
203: syslog(LOG_ERR, "routed: ifinit: out of memory\n");
204: close(s);
205: return;
206: }
207: strcpy(ifp->int_name, ifr->ifr_name);
208: *ifnext = ifp;
209: ifnext = &ifp->int_next;
210: traceinit(ifp);
211: addrouteforif(ifp);
212: }
213: if (externalinterfaces > 1 && supplier < 0)
214: supplier = 1;
215: close(s);
216: }
217:
218: /*
219: * Add route for interface if not currently installed.
220: * Create route to other end if a point-to-point link,
221: * otherwise a route to this (sub)network.
222: * INTERNET SPECIFIC.
223: */
224: addrouteforif(ifp)
225: register struct interface *ifp;
226: {
227: struct sockaddr_in net;
228: struct sockaddr *dst;
229: int state;
230: register struct rt_entry *rt;
231:
232: if (ifp->int_flags & IFF_POINTOPOINT)
233: dst = &ifp->int_dstaddr;
234: else {
235: bzero((char *)&net, sizeof (net));
236: net.sin_family = AF_INET;
237: net.sin_addr = inet_makeaddr(ifp->int_subnet, INADDR_ANY);
238: dst = (struct sockaddr *)&net;
239: }
240: rt = rtfind(dst);
241: if (rt &&
242: (rt->rt_state & (RTS_INTERFACE | RTS_INTERNAL)) == RTS_INTERFACE)
243: return;
244: if (rt)
245: rtdelete(rt);
246: /*
247: * If interface on subnetted network,
248: * install route to network as well.
249: * This is meant for external viewers.
250: */
251: if ((ifp->int_flags & (IFF_SUBNET|IFF_POINTOPOINT)) == IFF_SUBNET) {
252: struct in_addr subnet;
253:
254: subnet = net.sin_addr;
255: net.sin_addr = inet_makeaddr(ifp->int_net, INADDR_ANY);
256: rt = rtfind(dst);
257: if (rt == 0)
258: rtadd(dst, &ifp->int_addr, ifp->int_metric,
259: ((ifp->int_flags & (IFF_INTERFACE|IFF_REMOTE)) |
260: RTS_PASSIVE | RTS_INTERNAL | RTS_SUBNET));
261: else if ((rt->rt_state & (RTS_INTERNAL|RTS_SUBNET)) ==
262: (RTS_INTERNAL|RTS_SUBNET) &&
263: ifp->int_metric < rt->rt_metric)
264: rtchange(rt, &rt->rt_router, ifp->int_metric);
265: net.sin_addr = subnet;
266: }
267: if (ifp->int_transitions++ > 0)
268: syslog(LOG_ERR, "re-installing interface %s", ifp->int_name);
269: state = ifp->int_flags &
270: (IFF_INTERFACE | IFF_PASSIVE | IFF_REMOTE | IFF_SUBNET);
271: if (ifp->int_flags & IFF_POINTOPOINT &&
272: (ntohl(((struct sockaddr_in *)&ifp->int_dstaddr)->sin_addr.s_addr) &
273: ifp->int_netmask) != ifp->int_net)
274: state &= ~RTS_SUBNET;
275: if (ifp->int_flags & IFF_LOOPBACK)
276: state |= RTS_EXTERNAL;
277: rtadd(dst, &ifp->int_addr, ifp->int_metric, state);
278: if (ifp->int_flags & IFF_POINTOPOINT && foundloopback)
279: add_ptopt_localrt(ifp);
280: }
281:
282: /*
283: * Add route to local end of point-to-point using loopback.
284: * If a route to this network is being sent to neighbors on other nets,
285: * mark this route as subnet so we don't have to propagate it too.
286: */
287: add_ptopt_localrt(ifp)
288: register struct interface *ifp;
289: {
290: struct rt_entry *rt;
291: struct sockaddr *dst;
292: struct sockaddr_in net;
293: int state;
294:
295: state = RTS_INTERFACE | RTS_PASSIVE;
296:
297: /* look for route to logical network */
298: bzero((char *)&net, sizeof (net));
299: net.sin_family = AF_INET;
300: net.sin_addr = inet_makeaddr(ifp->int_net, INADDR_ANY);
301: dst = (struct sockaddr *)&net;
302: rt = rtfind(dst);
303: if (rt && rt->rt_state & RTS_INTERNAL)
304: state |= RTS_SUBNET;
305:
306: dst = &ifp->int_addr;
307: if (rt = rtfind(dst)) {
308: if (rt && rt->rt_state & RTS_INTERFACE)
309: return;
310: rtdelete(rt);
311: }
312: rtadd(dst, &loopaddr, 1, state);
313: }
314:
315: /*
316: * As a concession to the ARPANET we read a list of gateways
317: * from /etc/gateways and add them to our tables. This file
318: * exists at each ARPANET gateway and indicates a set of ``remote''
319: * gateways (i.e. a gateway which we can't immediately determine
320: * if it's present or not as we can do for those directly connected
321: * at the hardware level). If a gateway is marked ``passive''
322: * in the file, then we assume it doesn't have a routing process
323: * of our design and simply assume it's always present. Those
324: * not marked passive are treated as if they were directly
325: * connected -- they're added into the interface list so we'll
326: * send them routing updates.
327: *
328: * PASSIVE ENTRIES AREN'T NEEDED OR USED ON GATEWAYS RUNNING EGP.
329: */
330: gwkludge()
331: {
332: struct sockaddr_in dst, gate;
333: FILE *fp;
334: char *type, *dname, *gname, *qual, buf[BUFSIZ];
335: struct interface *ifp;
336: int metric, n;
337: struct rt_entry route;
338:
339: fp = fopen(_PATH_GATEWAYS, "r");
340: if (fp == NULL)
341: return;
342: qual = buf;
343: dname = buf + 64;
344: gname = buf + ((BUFSIZ - 64) / 3);
345: type = buf + (((BUFSIZ - 64) * 2) / 3);
346: bzero((char *)&dst, sizeof (dst));
347: bzero((char *)&gate, sizeof (gate));
348: bzero((char *)&route, sizeof(route));
349: /* format: {net | host} XX gateway XX metric DD [passive | external]\n */
350: #define readentry(fp) \
351: fscanf((fp), "%s %s gateway %s metric %d %s\n", \
352: type, dname, gname, &metric, qual)
353: for (;;) {
354: if ((n = readentry(fp)) == EOF)
355: break;
356: if (!getnetorhostname(type, dname, &dst))
357: continue;
358: if (!gethostnameornumber(gname, &gate))
359: continue;
360: if (metric == 0) /* XXX */
361: metric = 1;
362: if (strcmp(qual, "passive") == 0) {
363: /*
364: * Passive entries aren't placed in our tables,
365: * only the kernel's, so we don't copy all of the
366: * external routing information within a net.
367: * Internal machines should use the default
368: * route to a suitable gateway (like us).
369: */
370: route.rt_dst = *(struct sockaddr *) &dst;
371: route.rt_router = *(struct sockaddr *) &gate;
372: route.rt_flags = RTF_UP;
373: if (strcmp(type, "host") == 0)
374: route.rt_flags |= RTF_HOST;
375: if (metric)
376: route.rt_flags |= RTF_GATEWAY;
377: (void) ioctl(s, SIOCADDRT, (char *)&route.rt_rt);
378: continue;
379: }
380: if (strcmp(qual, "external") == 0) {
381: /*
382: * Entries marked external are handled
383: * by other means, e.g. EGP,
384: * and are placed in our tables only
385: * to prevent overriding them
386: * with something else.
387: */
388: rtadd(&dst, &gate, metric, RTS_EXTERNAL|RTS_PASSIVE);
389: continue;
390: }
391: /* assume no duplicate entries */
392: externalinterfaces++;
393: ifp = (struct interface *)malloc(sizeof (*ifp));
394: bzero((char *)ifp, sizeof (*ifp));
395: ifp->int_flags = IFF_REMOTE;
396: /* can't identify broadcast capability */
397: ifp->int_net = inet_netof(dst.sin_addr);
398: if (strcmp(type, "host") == 0) {
399: ifp->int_flags |= IFF_POINTOPOINT;
400: ifp->int_dstaddr = *((struct sockaddr *)&dst);
401: }
402: ifp->int_addr = *((struct sockaddr *)&gate);
403: ifp->int_metric = metric;
404: ifp->int_next = ifnet;
405: ifnet = ifp;
406: addrouteforif(ifp);
407: }
408: fclose(fp);
409: }
410:
411: getnetorhostname(type, name, sin)
412: char *type, *name;
413: struct sockaddr_in *sin;
414: {
415:
416: if (strcmp(type, "net") == 0) {
417: struct netent *np = getnetbyname(name);
418: int n;
419:
420: if (np == 0)
421: n = inet_network(name);
422: else {
423: if (np->n_addrtype != AF_INET)
424: return (0);
425: n = np->n_net;
426: /*
427: * getnetbyname returns right-adjusted value.
428: */
429: if (n < 128)
430: n <<= IN_CLASSA_NSHIFT;
431: else if (n < 65536)
432: n <<= IN_CLASSB_NSHIFT;
433: else
434: n <<= IN_CLASSC_NSHIFT;
435: }
436: sin->sin_family = AF_INET;
437: sin->sin_addr = inet_makeaddr(n, INADDR_ANY);
438: return (1);
439: }
440: if (strcmp(type, "host") == 0) {
441: struct hostent *hp = gethostbyname(name);
442:
443: if (hp == 0)
444: sin->sin_addr.s_addr = inet_addr(name);
445: else {
446: if (hp->h_addrtype != AF_INET)
447: return (0);
448: bcopy(hp->h_addr, &sin->sin_addr, hp->h_length);
449: }
450: sin->sin_family = AF_INET;
451: return (1);
452: }
453: return (0);
454: }
455:
456: gethostnameornumber(name, sin)
457: char *name;
458: struct sockaddr_in *sin;
459: {
460: struct hostent *hp;
461:
462: hp = gethostbyname(name);
463: if (hp) {
464: bcopy(hp->h_addr, &sin->sin_addr, hp->h_length);
465: sin->sin_family = hp->h_addrtype;
466: return (1);
467: }
468: sin->sin_addr.s_addr = inet_addr(name);
469: sin->sin_family = AF_INET;
470: return (sin->sin_addr.s_addr != -1);
471: }
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