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15637ed4 RG |
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, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #ifndef lint | |
35 | static char sccsid[] = "@(#)startup.c 5.19 (Berkeley) 2/28/91"; | |
36 | #endif /* not lint */ | |
37 | ||
38 | /* | |
39 | * Routing Table Management Daemon | |
40 | */ | |
41 | #include "defs.h" | |
42 | #include <sys/ioctl.h> | |
43 | #include <net/if.h> | |
44 | #include <syslog.h> | |
45 | #include <stdlib.h> | |
46 | #include "pathnames.h" | |
47 | ||
48 | struct interface *ifnet; | |
49 | struct interface **ifnext = &ifnet; | |
50 | int lookforinterfaces = 1; | |
51 | int externalinterfaces = 0; /* # of remote and local interfaces */ | |
52 | int foundloopback; /* valid flag for loopaddr */ | |
53 | struct sockaddr loopaddr; /* our address on loopback */ | |
54 | ||
55 | /* | |
56 | * Find the network interfaces which have configured themselves. | |
57 | * If the interface is present but not yet up (for example an | |
58 | * ARPANET IMP), set the lookforinterfaces flag so we'll | |
59 | * come back later and look again. | |
60 | */ | |
61 | ifinit() | |
62 | { | |
63 | struct interface ifs, *ifp; | |
64 | int s; | |
65 | char buf[BUFSIZ], *cp, *cplim; | |
66 | struct ifconf ifc; | |
67 | struct ifreq ifreq, *ifr; | |
68 | struct sockaddr_in *sin; | |
69 | u_long i; | |
70 | ||
71 | if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { | |
72 | syslog(LOG_ERR, "socket: %m"); | |
73 | close(s); | |
74 | return; | |
75 | } | |
76 | ifc.ifc_len = sizeof (buf); | |
77 | ifc.ifc_buf = buf; | |
78 | if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) { | |
79 | syslog(LOG_ERR, "ioctl (get interface configuration)"); | |
80 | close(s); | |
81 | return; | |
82 | } | |
83 | ifr = ifc.ifc_req; | |
84 | lookforinterfaces = 0; | |
85 | #ifdef RTM_ADD | |
86 | #define max(a, b) (a > b ? a : b) | |
87 | #define size(p) max((p).sa_len, sizeof(p)) | |
88 | #else | |
89 | #define size(p) (sizeof (p)) | |
90 | #endif | |
91 | cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */ | |
92 | for (cp = buf; cp < cplim; | |
93 | cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) { | |
94 | ifr = (struct ifreq *)cp; | |
95 | bzero((char *)&ifs, sizeof(ifs)); | |
96 | ifs.int_addr = ifr->ifr_addr; | |
97 | ifreq = *ifr; | |
98 | if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) { | |
99 | syslog(LOG_ERR, "%s: ioctl (get interface flags)", | |
100 | ifr->ifr_name); | |
101 | continue; | |
102 | } | |
103 | ifs.int_flags = ifreq.ifr_flags | IFF_INTERFACE; | |
104 | if ((ifs.int_flags & IFF_UP) == 0 || | |
105 | ifr->ifr_addr.sa_family == AF_UNSPEC) { | |
106 | lookforinterfaces = 1; | |
107 | continue; | |
108 | } | |
109 | /* argh, this'll have to change sometime */ | |
110 | if (ifs.int_addr.sa_family != AF_INET) | |
111 | continue; | |
112 | if (ifs.int_flags & IFF_POINTOPOINT) { | |
113 | if (ioctl(s, SIOCGIFDSTADDR, (char *)&ifreq) < 0) { | |
114 | syslog(LOG_ERR, "%s: ioctl (get dstaddr)", | |
115 | ifr->ifr_name); | |
116 | continue; | |
117 | } | |
118 | if (ifr->ifr_addr.sa_family == AF_UNSPEC) { | |
119 | lookforinterfaces = 1; | |
120 | continue; | |
121 | } | |
122 | ifs.int_dstaddr = ifreq.ifr_dstaddr; | |
123 | } | |
124 | /* | |
125 | * already known to us? | |
126 | * This allows multiple point-to-point links | |
127 | * to share a source address (possibly with one | |
128 | * other link), but assumes that there will not be | |
129 | * multiple links with the same destination address. | |
130 | */ | |
131 | if (ifs.int_flags & IFF_POINTOPOINT) { | |
132 | if (if_ifwithdstaddr(&ifs.int_dstaddr)) | |
133 | continue; | |
134 | } else if (if_ifwithaddr(&ifs.int_addr)) | |
135 | continue; | |
136 | if (ifs.int_flags & IFF_LOOPBACK) { | |
137 | ifs.int_flags |= IFF_PASSIVE; | |
138 | foundloopback = 1; | |
139 | loopaddr = ifs.int_addr; | |
140 | for (ifp = ifnet; ifp; ifp = ifp->int_next) | |
141 | if (ifp->int_flags & IFF_POINTOPOINT) | |
142 | add_ptopt_localrt(ifp); | |
143 | } | |
144 | if (ifs.int_flags & IFF_BROADCAST) { | |
145 | if (ioctl(s, SIOCGIFBRDADDR, (char *)&ifreq) < 0) { | |
146 | syslog(LOG_ERR, "%s: ioctl (get broadaddr)", | |
147 | ifr->ifr_name); | |
148 | continue; | |
149 | } | |
150 | #ifndef sun | |
151 | ifs.int_broadaddr = ifreq.ifr_broadaddr; | |
152 | #else | |
153 | ifs.int_broadaddr = ifreq.ifr_addr; | |
154 | #endif | |
155 | } | |
156 | #ifdef SIOCGIFMETRIC | |
157 | if (ioctl(s, SIOCGIFMETRIC, (char *)&ifreq) < 0) { | |
158 | syslog(LOG_ERR, "%s: ioctl (get metric)", | |
159 | ifr->ifr_name); | |
160 | ifs.int_metric = 0; | |
161 | } else | |
162 | ifs.int_metric = ifreq.ifr_metric; | |
163 | #else | |
164 | ifs.int_metric = 0; | |
165 | #endif | |
166 | /* | |
167 | * Use a minimum metric of one; | |
168 | * treat the interface metric (default 0) | |
169 | * as an increment to the hop count of one. | |
170 | */ | |
171 | ifs.int_metric++; | |
172 | if (ioctl(s, SIOCGIFNETMASK, (char *)&ifreq) < 0) { | |
173 | syslog(LOG_ERR, "%s: ioctl (get netmask)", | |
174 | ifr->ifr_name); | |
175 | continue; | |
176 | } | |
177 | sin = (struct sockaddr_in *)&ifreq.ifr_addr; | |
178 | ifs.int_subnetmask = ntohl(sin->sin_addr.s_addr); | |
179 | sin = (struct sockaddr_in *)&ifs.int_addr; | |
180 | i = ntohl(sin->sin_addr.s_addr); | |
181 | if (IN_CLASSA(i)) | |
182 | ifs.int_netmask = IN_CLASSA_NET; | |
183 | else if (IN_CLASSB(i)) | |
184 | ifs.int_netmask = IN_CLASSB_NET; | |
185 | else | |
186 | ifs.int_netmask = IN_CLASSC_NET; | |
187 | ifs.int_net = i & ifs.int_netmask; | |
188 | ifs.int_subnet = i & ifs.int_subnetmask; | |
189 | if (ifs.int_subnetmask != ifs.int_netmask) | |
190 | ifs.int_flags |= IFF_SUBNET; | |
191 | ifp = (struct interface *)malloc(sizeof (struct interface)); | |
192 | if (ifp == 0) { | |
193 | printf("routed: out of memory\n"); | |
194 | break; | |
195 | } | |
196 | *ifp = ifs; | |
197 | /* | |
198 | * Count the # of directly connected networks | |
199 | * and point to point links which aren't looped | |
200 | * back to ourself. This is used below to | |
201 | * decide if we should be a routing ``supplier''. | |
202 | */ | |
203 | if ((ifs.int_flags & IFF_LOOPBACK) == 0 && | |
204 | ((ifs.int_flags & IFF_POINTOPOINT) == 0 || | |
205 | if_ifwithaddr(&ifs.int_dstaddr) == 0)) | |
206 | externalinterfaces++; | |
207 | /* | |
208 | * If we have a point-to-point link, we want to act | |
209 | * as a supplier even if it's our only interface, | |
210 | * as that's the only way our peer on the other end | |
211 | * can tell that the link is up. | |
212 | */ | |
213 | if ((ifs.int_flags & IFF_POINTOPOINT) && supplier < 0) | |
214 | supplier = 1; | |
215 | ifp->int_name = malloc(strlen(ifr->ifr_name) + 1); | |
216 | if (ifp->int_name == 0) { | |
217 | fprintf(stderr, "routed: ifinit: out of memory\n"); | |
218 | syslog(LOG_ERR, "routed: ifinit: out of memory\n"); | |
219 | close(s); | |
220 | return; | |
221 | } | |
222 | strcpy(ifp->int_name, ifr->ifr_name); | |
223 | *ifnext = ifp; | |
224 | ifnext = &ifp->int_next; | |
225 | traceinit(ifp); | |
226 | addrouteforif(ifp); | |
227 | } | |
228 | if (externalinterfaces > 1 && supplier < 0) | |
229 | supplier = 1; | |
230 | close(s); | |
231 | } | |
232 | ||
233 | /* | |
234 | * Add route for interface if not currently installed. | |
235 | * Create route to other end if a point-to-point link, | |
236 | * otherwise a route to this (sub)network. | |
237 | * INTERNET SPECIFIC. | |
238 | */ | |
239 | addrouteforif(ifp) | |
240 | register struct interface *ifp; | |
241 | { | |
242 | struct sockaddr_in net; | |
243 | struct sockaddr *dst; | |
244 | int state; | |
245 | register struct rt_entry *rt; | |
246 | ||
247 | if (ifp->int_flags & IFF_POINTOPOINT) | |
248 | dst = &ifp->int_dstaddr; | |
249 | else { | |
250 | bzero((char *)&net, sizeof (net)); | |
251 | net.sin_family = AF_INET; | |
252 | net.sin_addr = inet_makeaddr(ifp->int_subnet, INADDR_ANY); | |
253 | dst = (struct sockaddr *)&net; | |
254 | } | |
255 | rt = rtfind(dst); | |
256 | if (rt && | |
257 | (rt->rt_state & (RTS_INTERFACE | RTS_INTERNAL)) == RTS_INTERFACE) | |
258 | return; | |
259 | if (rt) | |
260 | rtdelete(rt); | |
261 | /* | |
262 | * If interface on subnetted network, | |
263 | * install route to network as well. | |
264 | * This is meant for external viewers. | |
265 | */ | |
266 | if ((ifp->int_flags & (IFF_SUBNET|IFF_POINTOPOINT)) == IFF_SUBNET) { | |
267 | struct in_addr subnet; | |
268 | ||
269 | subnet = net.sin_addr; | |
270 | net.sin_addr = inet_makeaddr(ifp->int_net, INADDR_ANY); | |
271 | rt = rtfind(dst); | |
272 | if (rt == 0) | |
273 | rtadd(dst, &ifp->int_addr, ifp->int_metric, | |
274 | ((ifp->int_flags & (IFF_INTERFACE|IFF_REMOTE)) | | |
275 | RTS_PASSIVE | RTS_INTERNAL | RTS_SUBNET)); | |
276 | else if ((rt->rt_state & (RTS_INTERNAL|RTS_SUBNET)) == | |
277 | (RTS_INTERNAL|RTS_SUBNET) && | |
278 | ifp->int_metric < rt->rt_metric) | |
279 | rtchange(rt, &rt->rt_router, ifp->int_metric); | |
280 | net.sin_addr = subnet; | |
281 | } | |
282 | if (ifp->int_transitions++ > 0) | |
283 | syslog(LOG_ERR, "re-installing interface %s", ifp->int_name); | |
284 | state = ifp->int_flags & | |
285 | (IFF_INTERFACE | IFF_PASSIVE | IFF_REMOTE | IFF_SUBNET); | |
286 | if (ifp->int_flags & IFF_POINTOPOINT && | |
287 | (ntohl(((struct sockaddr_in *)&ifp->int_dstaddr)->sin_addr.s_addr) & | |
288 | ifp->int_netmask) != ifp->int_net) | |
289 | state &= ~RTS_SUBNET; | |
290 | if (ifp->int_flags & IFF_LOOPBACK) | |
291 | state |= RTS_EXTERNAL; | |
292 | rtadd(dst, &ifp->int_addr, ifp->int_metric, state); | |
293 | if (ifp->int_flags & IFF_POINTOPOINT && foundloopback) | |
294 | add_ptopt_localrt(ifp); | |
295 | } | |
296 | ||
297 | /* | |
298 | * Add route to local end of point-to-point using loopback. | |
299 | * If a route to this network is being sent to neighbors on other nets, | |
300 | * mark this route as subnet so we don't have to propagate it too. | |
301 | */ | |
302 | add_ptopt_localrt(ifp) | |
303 | register struct interface *ifp; | |
304 | { | |
305 | struct rt_entry *rt; | |
306 | struct sockaddr *dst; | |
307 | struct sockaddr_in net; | |
308 | int state; | |
309 | ||
310 | state = RTS_INTERFACE | RTS_PASSIVE; | |
311 | ||
312 | /* look for route to logical network */ | |
313 | bzero((char *)&net, sizeof (net)); | |
314 | net.sin_family = AF_INET; | |
315 | net.sin_addr = inet_makeaddr(ifp->int_net, INADDR_ANY); | |
316 | dst = (struct sockaddr *)&net; | |
317 | rt = rtfind(dst); | |
318 | if (rt && rt->rt_state & RTS_INTERNAL) | |
319 | state |= RTS_SUBNET; | |
320 | ||
321 | dst = &ifp->int_addr; | |
322 | if (rt = rtfind(dst)) { | |
323 | if (rt && rt->rt_state & RTS_INTERFACE) | |
324 | return; | |
325 | rtdelete(rt); | |
326 | } | |
327 | rtadd(dst, &loopaddr, 1, state); | |
328 | } | |
329 | ||
330 | /* | |
331 | * As a concession to the ARPANET we read a list of gateways | |
332 | * from /etc/gateways and add them to our tables. This file | |
333 | * exists at each ARPANET gateway and indicates a set of ``remote'' | |
334 | * gateways (i.e. a gateway which we can't immediately determine | |
335 | * if it's present or not as we can do for those directly connected | |
336 | * at the hardware level). If a gateway is marked ``passive'' | |
337 | * in the file, then we assume it doesn't have a routing process | |
338 | * of our design and simply assume it's always present. Those | |
339 | * not marked passive are treated as if they were directly | |
340 | * connected -- they're added into the interface list so we'll | |
341 | * send them routing updates. | |
342 | * | |
343 | * PASSIVE ENTRIES AREN'T NEEDED OR USED ON GATEWAYS RUNNING EGP. | |
344 | */ | |
345 | gwkludge() | |
346 | { | |
347 | struct sockaddr_in dst, gate; | |
348 | FILE *fp; | |
349 | char *type, *dname, *gname, *qual, buf[BUFSIZ]; | |
350 | struct interface *ifp; | |
351 | int metric, n; | |
352 | struct rt_entry route; | |
353 | ||
354 | fp = fopen(_PATH_GATEWAYS, "r"); | |
355 | if (fp == NULL) | |
356 | return; | |
357 | qual = buf; | |
358 | dname = buf + 64; | |
359 | gname = buf + ((BUFSIZ - 64) / 3); | |
360 | type = buf + (((BUFSIZ - 64) * 2) / 3); | |
361 | bzero((char *)&dst, sizeof (dst)); | |
362 | bzero((char *)&gate, sizeof (gate)); | |
363 | bzero((char *)&route, sizeof(route)); | |
364 | /* format: {net | host} XX gateway XX metric DD [passive | external]\n */ | |
365 | #define readentry(fp) \ | |
366 | fscanf((fp), "%s %s gateway %s metric %d %s\n", \ | |
367 | type, dname, gname, &metric, qual) | |
368 | for (;;) { | |
369 | if ((n = readentry(fp)) == EOF) | |
370 | break; | |
371 | if (!getnetorhostname(type, dname, &dst)) | |
372 | continue; | |
373 | if (!gethostnameornumber(gname, &gate)) | |
374 | continue; | |
375 | if (metric == 0) /* XXX */ | |
376 | metric = 1; | |
377 | if (strcmp(qual, "passive") == 0) { | |
378 | /* | |
379 | * Passive entries aren't placed in our tables, | |
380 | * only the kernel's, so we don't copy all of the | |
381 | * external routing information within a net. | |
382 | * Internal machines should use the default | |
383 | * route to a suitable gateway (like us). | |
384 | */ | |
385 | route.rt_dst = *(struct sockaddr *) &dst; | |
386 | route.rt_router = *(struct sockaddr *) &gate; | |
387 | route.rt_flags = RTF_UP; | |
388 | if (strcmp(type, "host") == 0) | |
389 | route.rt_flags |= RTF_HOST; | |
390 | if (metric) | |
391 | route.rt_flags |= RTF_GATEWAY; | |
392 | (void) ioctl(s, SIOCADDRT, (char *)&route.rt_rt); | |
393 | continue; | |
394 | } | |
395 | if (strcmp(qual, "external") == 0) { | |
396 | /* | |
397 | * Entries marked external are handled | |
398 | * by other means, e.g. EGP, | |
399 | * and are placed in our tables only | |
400 | * to prevent overriding them | |
401 | * with something else. | |
402 | */ | |
403 | rtadd(&dst, &gate, metric, RTS_EXTERNAL|RTS_PASSIVE); | |
404 | continue; | |
405 | } | |
406 | /* assume no duplicate entries */ | |
407 | externalinterfaces++; | |
408 | ifp = (struct interface *)malloc(sizeof (*ifp)); | |
409 | bzero((char *)ifp, sizeof (*ifp)); | |
410 | ifp->int_flags = IFF_REMOTE; | |
411 | /* can't identify broadcast capability */ | |
412 | ifp->int_net = inet_netof(dst.sin_addr); | |
413 | if (strcmp(type, "host") == 0) { | |
414 | ifp->int_flags |= IFF_POINTOPOINT; | |
415 | ifp->int_dstaddr = *((struct sockaddr *)&dst); | |
416 | } | |
417 | ifp->int_addr = *((struct sockaddr *)&gate); | |
418 | ifp->int_metric = metric; | |
419 | ifp->int_next = ifnet; | |
420 | ifnet = ifp; | |
421 | addrouteforif(ifp); | |
422 | } | |
423 | fclose(fp); | |
424 | } | |
425 | ||
426 | getnetorhostname(type, name, sin) | |
427 | char *type, *name; | |
428 | struct sockaddr_in *sin; | |
429 | { | |
430 | ||
431 | if (strcmp(type, "net") == 0) { | |
432 | struct netent *np = getnetbyname(name); | |
433 | int n; | |
434 | ||
435 | if (np == 0) | |
436 | n = inet_network(name); | |
437 | else { | |
438 | if (np->n_addrtype != AF_INET) | |
439 | return (0); | |
440 | n = np->n_net; | |
441 | /* | |
442 | * getnetbyname returns right-adjusted value. | |
443 | */ | |
444 | if (n < 128) | |
445 | n <<= IN_CLASSA_NSHIFT; | |
446 | else if (n < 65536) | |
447 | n <<= IN_CLASSB_NSHIFT; | |
448 | else | |
449 | n <<= IN_CLASSC_NSHIFT; | |
450 | } | |
451 | sin->sin_family = AF_INET; | |
452 | sin->sin_addr = inet_makeaddr(n, INADDR_ANY); | |
453 | return (1); | |
454 | } | |
455 | if (strcmp(type, "host") == 0) { | |
456 | struct hostent *hp = gethostbyname(name); | |
457 | ||
458 | if (hp == 0) | |
459 | sin->sin_addr.s_addr = inet_addr(name); | |
460 | else { | |
461 | if (hp->h_addrtype != AF_INET) | |
462 | return (0); | |
463 | bcopy(hp->h_addr, &sin->sin_addr, hp->h_length); | |
464 | } | |
465 | sin->sin_family = AF_INET; | |
466 | return (1); | |
467 | } | |
468 | return (0); | |
469 | } | |
470 | ||
471 | gethostnameornumber(name, sin) | |
472 | char *name; | |
473 | struct sockaddr_in *sin; | |
474 | { | |
475 | struct hostent *hp; | |
476 | ||
477 | hp = gethostbyname(name); | |
478 | if (hp) { | |
479 | bcopy(hp->h_addr, &sin->sin_addr, hp->h_length); | |
480 | sin->sin_family = hp->h_addrtype; | |
481 | return (1); | |
482 | } | |
483 | sin->sin_addr.s_addr = inet_addr(name); | |
484 | sin->sin_family = AF_INET; | |
485 | return (sin->sin_addr.s_addr != -1); | |
486 | } |