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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 this notice is preserved and that due credit is given
7: * to the University of California at Berkeley. The name of the University
8: * may not be used to endorse or promote products derived from this
9: * software without specific prior written permission. This software
10: * is provided ``as is'' without express or implied warranty.
11: */
12:
13: #ifndef lint
14: static char sccsid[] = "@(#)startup.c 5.13 (Berkeley) 6/6/88";
15: #endif /* not lint */
16:
17: /*
18: * Routing Table Management Daemon
19: */
20: #include "defs.h"
21: #include <sys/ioctl.h>
22: #include <net/if.h>
23: #include <syslog.h>
24:
25: struct interface *ifnet;
26: int lookforinterfaces = 1;
27: int externalinterfaces = 0; /* # of remote and local interfaces */
28: int foundloopback; /* valid flag for loopaddr */
29: struct sockaddr loopaddr; /* our address on loopback */
30:
31: /*
32: * Find the network interfaces which have configured themselves.
33: * If the interface is present but not yet up (for example an
34: * ARPANET IMP), set the lookforinterfaces flag so we'll
35: * come back later and look again.
36: */
37: ifinit()
38: {
39: struct interface ifs, *ifp;
40: int s, n;
41: char buf[BUFSIZ];
42: struct ifconf ifc;
43: struct ifreq ifreq, *ifr;
44: struct sockaddr_in *sin;
45: u_long i;
46:
47: if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
48: syslog(LOG_ERR, "socket: %m");
49: exit(1);
50: }
51: ifc.ifc_len = sizeof (buf);
52: ifc.ifc_buf = buf;
53: if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) {
54: syslog(LOG_ERR, "ioctl (get interface configuration)");
55: close(s);
56: return (0);
57: }
58: ifr = ifc.ifc_req;
59: lookforinterfaces = 0;
60: for (n = ifc.ifc_len / sizeof (struct ifreq); n > 0; n--, ifr++) {
61: bzero((char *)&ifs, sizeof(ifs));
62: ifs.int_addr = ifr->ifr_addr;
63: ifreq = *ifr;
64: if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
65: syslog(LOG_ERR, "ioctl (get interface flags)");
66: continue;
67: }
68: ifs.int_flags = ifreq.ifr_flags | IFF_INTERFACE;
69: if ((ifs.int_flags & IFF_UP) == 0 ||
70: ifr->ifr_addr.sa_family == AF_UNSPEC) {
71: lookforinterfaces = 1;
72: continue;
73: }
74: /*
75: * already known to us?
76: * This allows multiple point-to-point links
77: * to share a source address (possibly with one
78: * other link), but assumes that there will not be
79: * multiple links with the same destination address.
80: */
81: if (ifs.int_flags & IFF_POINTOPOINT) {
82: if (if_ifwithdstaddr(&ifs.int_dstaddr))
83: continue;
84: } else if (if_ifwithaddr(&ifs.int_addr))
85: continue;
86: /* argh, this'll have to change sometime */
87: if (ifs.int_addr.sa_family != AF_INET)
88: continue;
89: if (ifs.int_flags & IFF_LOOPBACK) {
90: ifs.int_flags |= IFF_PASSIVE;
91: foundloopback = 1;
92: loopaddr = ifs.int_addr;
93: for (ifp = ifnet; ifp; ifp = ifp->int_next)
94: if (ifp->int_flags & IFF_POINTOPOINT)
95: add_ptopt_localrt(ifp);
96: }
97: if (ifs.int_flags & IFF_POINTOPOINT) {
98: if (ioctl(s, SIOCGIFDSTADDR, (char *)&ifreq) < 0) {
99: syslog(LOG_ERR, "ioctl (get dstaddr)");
100: continue;
101: }
102: ifs.int_dstaddr = ifreq.ifr_dstaddr;
103: }
104: if (ifs.int_flags & IFF_BROADCAST) {
105: if (ioctl(s, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {
106: syslog(LOG_ERR, "ioctl (get broadaddr)");
107: continue;
108: }
109: ifs.int_broadaddr = ifreq.ifr_broadaddr;
110: }
111: if (ioctl(s, SIOCGIFMETRIC, (char *)&ifreq) < 0)
112: syslog(LOG_ERR, "ioctl (get metric)");
113: else
114: ifs.int_metric = ifreq.ifr_metric;
115: /*
116: * Use a minimum metric of one;
117: * treat the interface metric (default 0)
118: * as an increment to the hop count of one.
119: */
120: ifs.int_metric++;
121: if (ioctl(s, SIOCGIFNETMASK, (char *)&ifreq) < 0) {
122: syslog(LOG_ERR, "ioctl (get netmask)");
123: continue;
124: }
125: sin = (struct sockaddr_in *)&ifreq.ifr_addr;
126: ifs.int_subnetmask = ntohl(sin->sin_addr.s_addr);
127: sin = (struct sockaddr_in *)&ifs.int_addr;
128: i = ntohl(sin->sin_addr.s_addr);
129: if (IN_CLASSA(i))
130: ifs.int_netmask = IN_CLASSA_NET;
131: else if (IN_CLASSB(i))
132: ifs.int_netmask = IN_CLASSB_NET;
133: else
134: ifs.int_netmask = IN_CLASSC_NET;
135: ifs.int_net = i & ifs.int_netmask;
136: ifs.int_subnet = i & ifs.int_subnetmask;
137: if (ifs.int_subnetmask != ifs.int_netmask)
138: ifs.int_flags |= IFF_SUBNET;
139: ifp = (struct interface *)malloc(sizeof (struct interface));
140: if (ifp == 0) {
141: printf("routed: out of memory\n");
142: break;
143: }
144: *ifp = ifs;
145: /*
146: * Count the # of directly connected networks
147: * and point to point links which aren't looped
148: * back to ourself. This is used below to
149: * decide if we should be a routing ``supplier''.
150: */
151: if ((ifs.int_flags & IFF_LOOPBACK) == 0 &&
152: ((ifs.int_flags & IFF_POINTOPOINT) == 0 ||
153: if_ifwithaddr(&ifs.int_dstaddr) == 0))
154: externalinterfaces++;
155: /*
156: * If we have a point-to-point link, we want to act
157: * as a supplier even if it's our only interface,
158: * as that's the only way our peer on the other end
159: * can tell that the link is up.
160: */
161: if ((ifs.int_flags & IFF_POINTOPOINT) && supplier < 0)
162: supplier = 1;
163: ifp->int_name = malloc(strlen(ifr->ifr_name) + 1);
164: if (ifp->int_name == 0) {
165: fprintf(stderr, "routed: ifinit: out of memory\n");
166: syslog(LOG_ERR, "routed: ifinit: out of memory\n");
167: return;
168: }
169: strcpy(ifp->int_name, ifr->ifr_name);
170: ifp->int_next = ifnet;
171: ifnet = ifp;
172: traceinit(ifp);
173: addrouteforif(ifp);
174: }
175: if (externalinterfaces > 1 && supplier < 0)
176: supplier = 1;
177: close(s);
178: }
179:
180: /*
181: * Add route for interface if not currently installed.
182: * Create route to other end if a point-to-point link,
183: * otherwise a route to this (sub)network.
184: * INTERNET SPECIFIC.
185: */
186: addrouteforif(ifp)
187: register struct interface *ifp;
188: {
189: struct sockaddr_in net;
190: struct sockaddr *dst;
191: int state;
192: register struct rt_entry *rt;
193:
194: if (ifp->int_flags & IFF_POINTOPOINT)
195: dst = &ifp->int_dstaddr;
196: else {
197: bzero((char *)&net, sizeof (net));
198: net.sin_family = AF_INET;
199: net.sin_addr = inet_makeaddr(ifp->int_subnet, INADDR_ANY);
200: dst = (struct sockaddr *)&net;
201: }
202: rt = rtfind(dst);
203: if (rt &&
204: (rt->rt_state & (RTS_INTERFACE | RTS_INTERNAL)) == RTS_INTERFACE)
205: return;
206: if (rt)
207: rtdelete(rt);
208: /*
209: * If interface on subnetted network,
210: * install route to network as well.
211: * This is meant for external viewers.
212: */
213: if ((ifp->int_flags & (IFF_SUBNET|IFF_POINTOPOINT)) == IFF_SUBNET) {
214: struct in_addr subnet;
215:
216: subnet = net.sin_addr;
217: net.sin_addr = inet_makeaddr(ifp->int_net, INADDR_ANY);
218: rt = rtfind(dst);
219: if (rt == 0)
220: rtadd(dst, &ifp->int_addr, ifp->int_metric,
221: ((ifp->int_flags & (IFF_INTERFACE|IFF_REMOTE)) |
222: RTS_PASSIVE | RTS_INTERNAL | RTS_SUBNET));
223: else if ((rt->rt_state & (RTS_INTERNAL|RTS_SUBNET)) ==
224: (RTS_INTERNAL|RTS_SUBNET) &&
225: ifp->int_metric < rt->rt_metric)
226: rtchange(rt, &rt->rt_router, ifp->int_metric);
227: net.sin_addr = subnet;
228: }
229: if (ifp->int_transitions++ > 0)
230: syslog(LOG_ERR, "re-installing interface %s", ifp->int_name);
231: state = ifp->int_flags &
232: (IFF_INTERFACE | IFF_PASSIVE | IFF_REMOTE | IFF_SUBNET);
233: if (ifp->int_flags & IFF_POINTOPOINT &&
234: (ntohl(((struct sockaddr_in *)&ifp->int_dstaddr)->sin_addr.s_addr) &
235: ifp->int_netmask) != ifp->int_net)
236: state &= ~RTS_SUBNET;
237: if (ifp->int_flags & IFF_LOOPBACK)
238: state |= RTS_EXTERNAL;
239: rtadd(dst, &ifp->int_addr, ifp->int_metric, state);
240: if (ifp->int_flags & IFF_POINTOPOINT && foundloopback)
241: add_ptopt_localrt(ifp);
242: }
243:
244: /*
245: * Add route to local end of point-to-point using loopback.
246: * If a route to this network is being sent to neighbors on other nets,
247: * mark this route as subnet so we don't have to propagate it too.
248: */
249: add_ptopt_localrt(ifp)
250: register struct interface *ifp;
251: {
252: struct rt_entry *rt;
253: struct sockaddr *dst;
254: struct sockaddr_in net;
255: int state;
256:
257: state = RTS_INTERFACE | RTS_PASSIVE;
258:
259: /* look for route to logical network */
260: bzero((char *)&net, sizeof (net));
261: net.sin_family = AF_INET;
262: net.sin_addr = inet_makeaddr(ifp->int_net, INADDR_ANY);
263: dst = (struct sockaddr *)&net;
264: rt = rtfind(dst);
265: if (rt && rt->rt_state & RTS_INTERNAL)
266: state |= RTS_SUBNET;
267:
268: dst = &ifp->int_addr;
269: if (rt = rtfind(dst)) {
270: if (rt && rt->rt_state & RTS_INTERFACE)
271: return;
272: rtdelete(rt);
273: }
274: rtadd(dst, &loopaddr, 1, state);
275: }
276:
277: /*
278: * As a concession to the ARPANET we read a list of gateways
279: * from /etc/gateways and add them to our tables. This file
280: * exists at each ARPANET gateway and indicates a set of ``remote''
281: * gateways (i.e. a gateway which we can't immediately determine
282: * if it's present or not as we can do for those directly connected
283: * at the hardware level). If a gateway is marked ``passive''
284: * in the file, then we assume it doesn't have a routing process
285: * of our design and simply assume it's always present. Those
286: * not marked passive are treated as if they were directly
287: * connected -- they're added into the interface list so we'll
288: * send them routing updates.
289: *
290: * PASSIVE ENTRIES AREN'T NEEDED OR USED ON GATEWAYS RUNNING EGP.
291: */
292: gwkludge()
293: {
294: struct sockaddr_in dst, gate;
295: FILE *fp;
296: char *type, *dname, *gname, *qual, buf[BUFSIZ];
297: struct interface *ifp;
298: int metric, n;
299: struct rt_entry route;
300:
301: fp = fopen("/etc/gateways", "r");
302: if (fp == NULL)
303: return;
304: qual = buf;
305: dname = buf + 64;
306: gname = buf + ((BUFSIZ - 64) / 3);
307: type = buf + (((BUFSIZ - 64) * 2) / 3);
308: bzero((char *)&dst, sizeof (dst));
309: bzero((char *)&gate, sizeof (gate));
310: bzero((char *)&route, sizeof(route));
311: /* format: {net | host} XX gateway XX metric DD [passive | external]\n */
312: #define readentry(fp) \
313: fscanf((fp), "%s %s gateway %s metric %d %s\n", \
314: type, dname, gname, &metric, qual)
315: for (;;) {
316: if ((n = readentry(fp)) == EOF)
317: break;
318: if (!getnetorhostname(type, dname, &dst))
319: continue;
320: if (!gethostnameornumber(gname, &gate))
321: continue;
322: if (metric == 0) /* XXX */
323: metric = 1;
324: if (strcmp(qual, "passive") == 0) {
325: /*
326: * Passive entries aren't placed in our tables,
327: * only the kernel's, so we don't copy all of the
328: * external routing information within a net.
329: * Internal machines should use the default
330: * route to a suitable gateway (like us).
331: */
332: route.rt_dst = *(struct sockaddr *) &dst;
333: route.rt_router = *(struct sockaddr *) &gate;
334: route.rt_flags = RTF_UP;
335: if (strcmp(type, "host") == 0)
336: route.rt_flags |= RTF_HOST;
337: if (metric)
338: route.rt_flags |= RTF_GATEWAY;
339: (void) ioctl(s, SIOCADDRT, (char *)&route.rt_rt);
340: continue;
341: }
342: if (strcmp(qual, "external") == 0) {
343: /*
344: * Entries marked external are handled
345: * by other means, e.g. EGP,
346: * and are placed in our tables only
347: * to prevent overriding them
348: * with something else.
349: */
350: rtadd(&dst, &gate, metric, RTS_EXTERNAL|RTS_PASSIVE);
351: continue;
352: }
353: /* assume no duplicate entries */
354: externalinterfaces++;
355: ifp = (struct interface *)malloc(sizeof (*ifp));
356: bzero((char *)ifp, sizeof (*ifp));
357: ifp->int_flags = IFF_REMOTE;
358: /* can't identify broadcast capability */
359: ifp->int_net = inet_netof(dst.sin_addr);
360: if (strcmp(type, "host") == 0) {
361: ifp->int_flags |= IFF_POINTOPOINT;
362: ifp->int_dstaddr = *((struct sockaddr *)&dst);
363: }
364: ifp->int_addr = *((struct sockaddr *)&gate);
365: ifp->int_metric = metric;
366: ifp->int_next = ifnet;
367: ifnet = ifp;
368: addrouteforif(ifp);
369: }
370: fclose(fp);
371: }
372:
373: getnetorhostname(type, name, sin)
374: char *type, *name;
375: struct sockaddr_in *sin;
376: {
377:
378: if (strcmp(type, "net") == 0) {
379: struct netent *np = getnetbyname(name);
380: int n;
381:
382: if (np == 0)
383: n = inet_network(name);
384: else {
385: if (np->n_addrtype != AF_INET)
386: return (0);
387: n = np->n_net;
388: /*
389: * getnetbyname returns right-adjusted value.
390: */
391: if (n < 128)
392: n <<= IN_CLASSA_NSHIFT;
393: else if (n < 65536)
394: n <<= IN_CLASSB_NSHIFT;
395: else
396: n <<= IN_CLASSC_NSHIFT;
397: }
398: sin->sin_family = AF_INET;
399: sin->sin_addr = inet_makeaddr(n, INADDR_ANY);
400: return (1);
401: }
402: if (strcmp(type, "host") == 0) {
403: struct hostent *hp = gethostbyname(name);
404:
405: if (hp == 0)
406: sin->sin_addr.s_addr = inet_addr(name);
407: else {
408: if (hp->h_addrtype != AF_INET)
409: return (0);
410: bcopy(hp->h_addr, &sin->sin_addr, hp->h_length);
411: }
412: sin->sin_family = AF_INET;
413: return (1);
414: }
415: return (0);
416: }
417:
418: gethostnameornumber(name, sin)
419: char *name;
420: struct sockaddr_in *sin;
421: {
422: struct hostent *hp;
423:
424: hp = gethostbyname(name);
425: if (hp) {
426: bcopy(hp->h_addr, &sin->sin_addr, hp->h_length);
427: sin->sin_family = hp->h_addrtype;
428: return (1);
429: }
430: sin->sin_addr.s_addr = inet_addr(name);
431: sin->sin_family = AF_INET;
432: return (sin->sin_addr.s_addr != -1);
433: }
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