| 1 | /* |
| 2 | * Copyright (c) 1983 Regents of the University of California. |
| 3 | * All rights reserved. The Berkeley software License Agreement |
| 4 | * specifies the terms and conditions for redistribution. |
| 5 | */ |
| 6 | |
| 7 | #ifndef lint |
| 8 | static char sccsid[] = "@(#)startup.c 5.8 (Berkeley) %G%"; |
| 9 | #endif not lint |
| 10 | |
| 11 | /* |
| 12 | * Routing Table Management Daemon |
| 13 | */ |
| 14 | #include "defs.h" |
| 15 | #include <sys/ioctl.h> |
| 16 | #include <net/if.h> |
| 17 | #include <syslog.h> |
| 18 | |
| 19 | struct interface *ifnet; |
| 20 | int lookforinterfaces = 1; |
| 21 | int externalinterfaces = 0; /* # of remote and local interfaces */ |
| 22 | |
| 23 | /* |
| 24 | * Find the network interfaces which have configured themselves. |
| 25 | * If the interface is present but not yet up (for example an |
| 26 | * ARPANET IMP), set the lookforinterfaces flag so we'll |
| 27 | * come back later and look again. |
| 28 | */ |
| 29 | ifinit() |
| 30 | { |
| 31 | struct interface ifs, *ifp; |
| 32 | int s, n; |
| 33 | char buf[BUFSIZ]; |
| 34 | struct ifconf ifc; |
| 35 | struct ifreq ifreq, *ifr; |
| 36 | struct sockaddr_in *sin; |
| 37 | u_long i; |
| 38 | |
| 39 | if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { |
| 40 | syslog(LOG_ERR, "socket: %m"); |
| 41 | exit(1); |
| 42 | } |
| 43 | ifc.ifc_len = sizeof (buf); |
| 44 | ifc.ifc_buf = buf; |
| 45 | if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) { |
| 46 | syslog(LOG_ERR, "ioctl (get interface configuration)"); |
| 47 | close(s); |
| 48 | return (0); |
| 49 | } |
| 50 | ifr = ifc.ifc_req; |
| 51 | lookforinterfaces = 0; |
| 52 | for (n = ifc.ifc_len / sizeof (struct ifreq); n > 0; n--, ifr++) { |
| 53 | bzero((char *)&ifs, sizeof(ifs)); |
| 54 | ifs.int_addr = ifr->ifr_addr; |
| 55 | ifreq = *ifr; |
| 56 | if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) { |
| 57 | syslog(LOG_ERR, "ioctl (get interface flags)"); |
| 58 | continue; |
| 59 | } |
| 60 | ifs.int_flags = ifreq.ifr_flags | IFF_INTERFACE; |
| 61 | /* no one cares about software loopback interfaces */ |
| 62 | if (ifs.int_flags & IFF_LOOPBACK) |
| 63 | continue; |
| 64 | if ((ifs.int_flags & IFF_UP) == 0 || |
| 65 | ifr->ifr_addr.sa_family == AF_UNSPEC) { |
| 66 | lookforinterfaces = 1; |
| 67 | continue; |
| 68 | } |
| 69 | /* already known to us? */ |
| 70 | if (if_ifwithaddr(&ifs.int_addr)) |
| 71 | continue; |
| 72 | /* argh, this'll have to change sometime */ |
| 73 | if (ifs.int_addr.sa_family != AF_INET) |
| 74 | continue; |
| 75 | if (ifs.int_flags & IFF_POINTOPOINT) { |
| 76 | if (ioctl(s, SIOCGIFDSTADDR, (char *)&ifreq) < 0) { |
| 77 | syslog(LOG_ERR, "ioctl (get dstaddr)"); |
| 78 | continue; |
| 79 | } |
| 80 | ifs.int_dstaddr = ifreq.ifr_dstaddr; |
| 81 | } |
| 82 | if (ifs.int_flags & IFF_BROADCAST) { |
| 83 | if (ioctl(s, SIOCGIFBRDADDR, (char *)&ifreq) < 0) { |
| 84 | syslog(LOG_ERR, "ioctl (get broadaddr)"); |
| 85 | continue; |
| 86 | } |
| 87 | ifs.int_broadaddr = ifreq.ifr_broadaddr; |
| 88 | } |
| 89 | if (ioctl(s, SIOCGIFMETRIC, (char *)&ifreq) < 0) |
| 90 | syslog(LOG_ERR, "ioctl (get metric)"); |
| 91 | else |
| 92 | ifs.int_metric = ifreq.ifr_metric; |
| 93 | if (ioctl(s, SIOCGIFNETMASK, (char *)&ifreq) < 0) { |
| 94 | syslog(LOG_ERR, "ioctl (get netmask)"); |
| 95 | continue; |
| 96 | } |
| 97 | sin = (struct sockaddr_in *)&ifreq.ifr_addr; |
| 98 | ifs.int_subnetmask = ntohl(sin->sin_addr.s_addr); |
| 99 | sin = (struct sockaddr_in *)&ifs.int_addr; |
| 100 | i = ntohl(sin->sin_addr.s_addr); |
| 101 | if (IN_CLASSA(i)) |
| 102 | ifs.int_netmask = IN_CLASSA_NET; |
| 103 | else if (IN_CLASSB(i)) |
| 104 | ifs.int_netmask = IN_CLASSB_NET; |
| 105 | else |
| 106 | ifs.int_netmask = IN_CLASSC_NET; |
| 107 | ifs.int_net = i & ifs.int_netmask; |
| 108 | ifs.int_subnet = i & ifs.int_subnetmask; |
| 109 | if (ifs.int_subnetmask != ifs.int_netmask) |
| 110 | ifs.int_flags |= IFF_SUBNET; |
| 111 | ifp = (struct interface *)malloc(sizeof (struct interface)); |
| 112 | if (ifp == 0) { |
| 113 | printf("routed: out of memory\n"); |
| 114 | break; |
| 115 | } |
| 116 | *ifp = ifs; |
| 117 | /* |
| 118 | * Count the # of directly connected networks |
| 119 | * and point to point links which aren't looped |
| 120 | * back to ourself. This is used below to |
| 121 | * decide if we should be a routing ``supplier''. |
| 122 | */ |
| 123 | if ((ifs.int_flags & IFF_POINTOPOINT) == 0 || |
| 124 | if_ifwithaddr(&ifs.int_dstaddr) == 0) |
| 125 | externalinterfaces++; |
| 126 | /* |
| 127 | * If we have a point-to-point link, we want to act |
| 128 | * as a supplier even if it's our only interface, |
| 129 | * as that's the only way our peer on the other end |
| 130 | * can tell that the link is up. |
| 131 | */ |
| 132 | if ((ifs.int_flags & IFF_POINTOPOINT) && supplier < 0) |
| 133 | supplier = 1; |
| 134 | ifp->int_name = malloc(strlen(ifr->ifr_name) + 1); |
| 135 | if (ifp->int_name == 0) { |
| 136 | fprintf(stderr, "routed: ifinit: out of memory\n"); |
| 137 | goto bad; /* ??? */ |
| 138 | } |
| 139 | strcpy(ifp->int_name, ifr->ifr_name); |
| 140 | ifp->int_next = ifnet; |
| 141 | ifnet = ifp; |
| 142 | traceinit(ifp); |
| 143 | addrouteforif(ifp); |
| 144 | } |
| 145 | if (externalinterfaces > 1 && supplier < 0) |
| 146 | supplier = 1; |
| 147 | close(s); |
| 148 | return; |
| 149 | bad: |
| 150 | sleep(60); |
| 151 | close(kmem), close(s); |
| 152 | execv("/etc/routed", argv0); |
| 153 | _exit(0177); |
| 154 | } |
| 155 | |
| 156 | /* |
| 157 | * Add route for interface if not currently installed. |
| 158 | * Create route to other end if a point-to-point link, |
| 159 | * otherwise a route to this (sub)network. |
| 160 | * INTERNET SPECIFIC. |
| 161 | */ |
| 162 | addrouteforif(ifp) |
| 163 | struct interface *ifp; |
| 164 | { |
| 165 | struct sockaddr_in net; |
| 166 | struct sockaddr *dst; |
| 167 | int state, metric; |
| 168 | struct rt_entry *rt; |
| 169 | |
| 170 | if (ifp->int_flags & IFF_POINTOPOINT) |
| 171 | dst = &ifp->int_dstaddr; |
| 172 | else { |
| 173 | bzero((char *)&net, sizeof (net)); |
| 174 | net.sin_family = AF_INET; |
| 175 | net.sin_addr = inet_makeaddr(ifp->int_subnet, INADDR_ANY); |
| 176 | dst = (struct sockaddr *)&net; |
| 177 | } |
| 178 | rt = rtfind(dst); |
| 179 | if (rt && |
| 180 | (rt->rt_state & (RTS_INTERFACE | RTS_INTERNAL)) == RTS_INTERFACE) |
| 181 | return; |
| 182 | if (rt) |
| 183 | rtdelete(rt); |
| 184 | /* |
| 185 | * If interface on subnetted network, |
| 186 | * install route to network as well. |
| 187 | * This is meant for external viewers. |
| 188 | */ |
| 189 | if ((ifp->int_flags & (IFF_SUBNET|IFF_POINTOPOINT)) == IFF_SUBNET) { |
| 190 | net.sin_addr = inet_makeaddr(ifp->int_net, INADDR_ANY); |
| 191 | rt = rtfind(dst); |
| 192 | if (rt == 0) |
| 193 | rtadd(dst, &ifp->int_addr, ifp->int_metric, |
| 194 | ((ifp->int_flags & (IFF_INTERFACE|IFF_REMOTE)) | |
| 195 | RTS_PASSIVE | RTS_INTERNAL | RTS_SUBNET)); |
| 196 | net.sin_addr = inet_makeaddr(ifp->int_subnet, INADDR_ANY); |
| 197 | } |
| 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|IFF_SUBNET)); |
| 202 | |
| 203 | } |
| 204 | |
| 205 | /* |
| 206 | * As a concession to the ARPANET we read a list of gateways |
| 207 | * from /etc/gateways and add them to our tables. This file |
| 208 | * exists at each ARPANET gateway and indicates a set of ``remote'' |
| 209 | * gateways (i.e. a gateway which we can't immediately determine |
| 210 | * if it's present or not as we can do for those directly connected |
| 211 | * at the hardware level). If a gateway is marked ``passive'' |
| 212 | * in the file, then we assume it doesn't have a routing process |
| 213 | * of our design and simply assume it's always present. Those |
| 214 | * not marked passive are treated as if they were directly |
| 215 | * connected -- they're added into the interface list so we'll |
| 216 | * send them routing updates. |
| 217 | */ |
| 218 | gwkludge() |
| 219 | { |
| 220 | struct sockaddr_in dst, gate; |
| 221 | FILE *fp; |
| 222 | char *type, *dname, *gname, *qual, buf[BUFSIZ]; |
| 223 | struct interface *ifp; |
| 224 | int metric, n; |
| 225 | struct rt_entry route; |
| 226 | |
| 227 | fp = fopen("/etc/gateways", "r"); |
| 228 | if (fp == NULL) |
| 229 | return; |
| 230 | qual = buf; |
| 231 | dname = buf + 64; |
| 232 | gname = buf + ((BUFSIZ - 64) / 3); |
| 233 | type = buf + (((BUFSIZ - 64) * 2) / 3); |
| 234 | bzero((char *)&dst, sizeof (dst)); |
| 235 | bzero((char *)&gate, sizeof (gate)); |
| 236 | bzero((char *)&route, sizeof(route)); |
| 237 | /* format: {net | host} XX gateway XX metric DD [passive | external]\n */ |
| 238 | #define readentry(fp) \ |
| 239 | fscanf((fp), "%s %s gateway %s metric %d %s\n", \ |
| 240 | type, dname, gname, &metric, qual) |
| 241 | for (;;) { |
| 242 | if ((n = readentry(fp)) == EOF) |
| 243 | break; |
| 244 | if (!getnetorhostname(type, dname, &dst)) |
| 245 | continue; |
| 246 | if (!gethostnameornumber(gname, &gate)) |
| 247 | continue; |
| 248 | if (strcmp(qual, "passive") == 0) { |
| 249 | /* |
| 250 | * Passive entries aren't placed in our tables, |
| 251 | * only the kernel's, so we don't copy all of the |
| 252 | * external routing information within a net. |
| 253 | * Internal machines should use the default |
| 254 | * route to a suitable gateway (like us). |
| 255 | */ |
| 256 | route.rt_dst = *(struct sockaddr *) &dst; |
| 257 | route.rt_router = *(struct sockaddr *) &gate; |
| 258 | route.rt_flags = RTF_UP; |
| 259 | if (strcmp(type, "host") == 0) |
| 260 | route.rt_flags |= RTF_HOST; |
| 261 | if (metric) |
| 262 | route.rt_flags |= RTF_GATEWAY; |
| 263 | (void) ioctl(s, SIOCADDRT, (char *)&route.rt_rt); |
| 264 | continue; |
| 265 | } |
| 266 | if (strcmp(qual, "external") == 0) { |
| 267 | /* |
| 268 | * Entries marked external are handled |
| 269 | * by other means, e.g. EGP, |
| 270 | * and are placed in our tables only |
| 271 | * to prevent overriding them |
| 272 | * with something else. |
| 273 | */ |
| 274 | rtadd(&dst, &gate, metric, RTS_EXTERNAL|RTS_PASSIVE); |
| 275 | continue; |
| 276 | } |
| 277 | /* assume no duplicate entries */ |
| 278 | externalinterfaces++; |
| 279 | ifp = (struct interface *)malloc(sizeof (*ifp)); |
| 280 | bzero((char *)ifp, sizeof (*ifp)); |
| 281 | ifp->int_flags = IFF_REMOTE; |
| 282 | /* can't identify broadcast capability */ |
| 283 | ifp->int_net = inet_netof(dst.sin_addr); |
| 284 | if (strcmp(type, "host") == 0) { |
| 285 | ifp->int_flags |= IFF_POINTOPOINT; |
| 286 | ifp->int_dstaddr = *((struct sockaddr *)&dst); |
| 287 | } |
| 288 | ifp->int_addr = *((struct sockaddr *)&gate); |
| 289 | ifp->int_metric = metric; |
| 290 | ifp->int_next = ifnet; |
| 291 | ifnet = ifp; |
| 292 | addrouteforif(ifp); |
| 293 | } |
| 294 | fclose(fp); |
| 295 | } |
| 296 | |
| 297 | getnetorhostname(type, name, sin) |
| 298 | char *type, *name; |
| 299 | struct sockaddr_in *sin; |
| 300 | { |
| 301 | |
| 302 | if (strcmp(type, "net") == 0) { |
| 303 | struct netent *np = getnetbyname(name); |
| 304 | int n; |
| 305 | |
| 306 | if (np == 0) |
| 307 | n = inet_network(name); |
| 308 | else { |
| 309 | if (np->n_addrtype != AF_INET) |
| 310 | return (0); |
| 311 | n = np->n_net; |
| 312 | /* |
| 313 | * getnetbyname returns right-adjusted value. |
| 314 | */ |
| 315 | if (n < 128) |
| 316 | n <<= IN_CLASSA_NSHIFT; |
| 317 | else if (n < 65536) |
| 318 | n <<= IN_CLASSB_NSHIFT; |
| 319 | else |
| 320 | n <<= IN_CLASSC_NSHIFT; |
| 321 | } |
| 322 | sin->sin_family = AF_INET; |
| 323 | sin->sin_addr = inet_makeaddr(n, INADDR_ANY); |
| 324 | return (1); |
| 325 | } |
| 326 | if (strcmp(type, "host") == 0) { |
| 327 | struct hostent *hp = gethostbyname(name); |
| 328 | |
| 329 | if (hp == 0) |
| 330 | sin->sin_addr.s_addr = inet_addr(name); |
| 331 | else { |
| 332 | if (hp->h_addrtype != AF_INET) |
| 333 | return (0); |
| 334 | bcopy(hp->h_addr, &sin->sin_addr, hp->h_length); |
| 335 | } |
| 336 | sin->sin_family = AF_INET; |
| 337 | return (1); |
| 338 | } |
| 339 | return (0); |
| 340 | } |
| 341 | |
| 342 | gethostnameornumber(name, sin) |
| 343 | char *name; |
| 344 | struct sockaddr_in *sin; |
| 345 | { |
| 346 | struct hostent *hp; |
| 347 | |
| 348 | hp = gethostbyname(name); |
| 349 | if (hp) { |
| 350 | bcopy(hp->h_addr, &sin->sin_addr, hp->h_length); |
| 351 | sin->sin_family = hp->h_addrtype; |
| 352 | return (1); |
| 353 | } |
| 354 | sin->sin_addr.s_addr = inet_addr(name); |
| 355 | sin->sin_family = AF_INET; |
| 356 | return (sin->sin_addr.s_addr != -1); |
| 357 | } |