| 1 | #ifndef lint |
| 2 | static char sccsid[] = "@(#)startup.c 4.4 (Berkeley) %G%"; |
| 3 | #endif |
| 4 | |
| 5 | /* |
| 6 | * Routing Table Management Daemon |
| 7 | */ |
| 8 | #include "defs.h" |
| 9 | #include <net/if.h> |
| 10 | #include <nlist.h> |
| 11 | |
| 12 | struct interface *ifnet; |
| 13 | int kmem = -1; |
| 14 | int lookforinterfaces = 1; |
| 15 | int performnlist = 1; |
| 16 | int externalinterfaces = 0; /* # of remote and local interfaces */ |
| 17 | |
| 18 | struct nlist nl[] = { |
| 19 | #define N_IFNET 0 |
| 20 | { "_ifnet" }, |
| 21 | { "" }, |
| 22 | }; |
| 23 | |
| 24 | /* |
| 25 | * Probe the kernel through /dev/kmem to find the network |
| 26 | * interfaces which have configured themselves. If the |
| 27 | * interface is present but not yet up (for example an |
| 28 | * ARPANET IMP), set the lookforinterfaces flag so we'll |
| 29 | * come back later and look again. |
| 30 | */ |
| 31 | ifinit() |
| 32 | { |
| 33 | struct interface *ifp; |
| 34 | struct ifnet ifs, *next; |
| 35 | char name[32], *cp, *index(); |
| 36 | |
| 37 | if (performnlist) { |
| 38 | nlist("/vmunix", nl); |
| 39 | if (nl[N_IFNET].n_value == 0) { |
| 40 | printf("ifnet: not in namelist\n"); |
| 41 | goto bad; |
| 42 | } |
| 43 | performnlist = 0; |
| 44 | } |
| 45 | if (kmem < 0) { |
| 46 | kmem = open("/dev/kmem", 0); |
| 47 | if (kmem < 0) { |
| 48 | perror("/dev/kmem"); |
| 49 | goto bad; |
| 50 | } |
| 51 | } |
| 52 | if (lseek(kmem, (long)nl[N_IFNET].n_value, 0) == -1 || |
| 53 | read(kmem, (char *)&next, sizeof (next)) != sizeof (next)) { |
| 54 | printf("ifnet: error reading kmem\n"); |
| 55 | goto bad; |
| 56 | } |
| 57 | lookforinterfaces = 0; |
| 58 | while (next) { |
| 59 | if (lseek(kmem, (long)next, 0) == -1 || |
| 60 | read(kmem, (char *)&ifs, sizeof (ifs)) != sizeof (ifs)) { |
| 61 | perror("read"); |
| 62 | goto bad; |
| 63 | } |
| 64 | next = ifs.if_next; |
| 65 | if ((ifs.if_flags & IFF_UP) == 0) { |
| 66 | lookforinterfaces = 1; |
| 67 | continue; |
| 68 | } |
| 69 | /* already known to us? */ |
| 70 | if (if_ifwithaddr(&ifs.if_addr)) |
| 71 | continue; |
| 72 | /* argh, this'll have to change sometime */ |
| 73 | if (ifs.if_addr.sa_family != AF_INET) |
| 74 | continue; |
| 75 | /* no one cares about software loopback interfaces */ |
| 76 | if (ifs.if_net == LOOPBACKNET) |
| 77 | continue; |
| 78 | ifp = (struct interface *)malloc(sizeof (struct interface)); |
| 79 | if (ifp == 0) { |
| 80 | printf("routed: out of memory\n"); |
| 81 | break; |
| 82 | } |
| 83 | /* |
| 84 | * Count the # of directly connected networks |
| 85 | * and point to point links which aren't looped |
| 86 | * back to ourself. This is used below to |
| 87 | * decide if we should be a routing ``supplier''. |
| 88 | */ |
| 89 | if ((ifs.if_flags & IFF_POINTOPOINT) == 0 || |
| 90 | if_ifwithaddr(&ifs.if_dstaddr) == 0) |
| 91 | externalinterfaces++; |
| 92 | lseek(kmem, ifs.if_name, 0); |
| 93 | read(kmem, name, sizeof (name)); |
| 94 | name[sizeof (name) - 1] = '\0'; |
| 95 | cp = index(name, '\0'); |
| 96 | *cp++ = ifs.if_unit + '0'; |
| 97 | *cp = '\0'; |
| 98 | ifp->int_name = malloc(strlen(name) + 1); |
| 99 | if (ifp->int_name == 0) { |
| 100 | fprintf(stderr, "routed: ifinit: out of memory\n"); |
| 101 | goto bad; /* ??? */ |
| 102 | } |
| 103 | strcpy(ifp->int_name, name); |
| 104 | ifp->int_addr = ifs.if_addr; |
| 105 | ifp->int_flags = ifs.if_flags | IFF_INTERFACE; |
| 106 | /* this works because broadaddr overlaps dstaddr */ |
| 107 | ifp->int_broadaddr = ifs.if_broadaddr; |
| 108 | ifp->int_net = ifs.if_net; |
| 109 | ifp->int_metric = 0; |
| 110 | ifp->int_next = ifnet; |
| 111 | ifnet = ifp; |
| 112 | traceinit(ifp); |
| 113 | addrouteforif(ifp); |
| 114 | } |
| 115 | if (externalinterfaces > 1 && supplier < 0) |
| 116 | supplier = 1; |
| 117 | return; |
| 118 | bad: |
| 119 | sleep(60); |
| 120 | close(kmem), close(s); |
| 121 | execv("/etc/routed", argv0); |
| 122 | _exit(0177); |
| 123 | } |
| 124 | |
| 125 | addrouteforif(ifp) |
| 126 | struct interface *ifp; |
| 127 | { |
| 128 | struct sockaddr_in net; |
| 129 | struct sockaddr *dst; |
| 130 | int state, metric; |
| 131 | struct rt_entry *rt; |
| 132 | |
| 133 | if (ifp->int_flags & IFF_POINTOPOINT) |
| 134 | dst = &ifp->int_dstaddr; |
| 135 | else { |
| 136 | bzero((char *)&net, sizeof (net)); |
| 137 | net.sin_family = AF_INET; |
| 138 | net.sin_addr = inet_makeaddr(ifp->int_net, INADDR_ANY); |
| 139 | dst = (struct sockaddr *)&net; |
| 140 | } |
| 141 | rt = rtlookup(dst); |
| 142 | rtadd(dst, &ifp->int_addr, ifp->int_metric, |
| 143 | ifp->int_flags & (IFF_INTERFACE|IFF_PASSIVE|IFF_REMOTE)); |
| 144 | if (rt) |
| 145 | rtdelete(rt); |
| 146 | } |
| 147 | |
| 148 | /* |
| 149 | * As a concession to the ARPANET we read a list of gateways |
| 150 | * from /etc/gateways and add them to our tables. This file |
| 151 | * exists at each ARPANET gateway and indicates a set of ``remote'' |
| 152 | * gateways (i.e. a gateway which we can't immediately determine |
| 153 | * if it's present or not as we can do for those directly connected |
| 154 | * at the hardware level). If a gateway is marked ``passive'' |
| 155 | * in the file, then we assume it doesn't have a routing process |
| 156 | * of our design and simply assume it's always present. Those |
| 157 | * not marked passive are treated as if they were directly |
| 158 | * connected -- they're added into the interface list so we'll |
| 159 | * send them routing updates. |
| 160 | */ |
| 161 | gwkludge() |
| 162 | { |
| 163 | struct sockaddr_in dst, gate; |
| 164 | FILE *fp; |
| 165 | char *type, *dname, *gname, *qual, buf[BUFSIZ]; |
| 166 | struct interface *ifp; |
| 167 | int metric; |
| 168 | |
| 169 | fp = fopen("/etc/gateways", "r"); |
| 170 | if (fp == NULL) |
| 171 | return; |
| 172 | qual = buf; |
| 173 | dname = buf + 64; |
| 174 | gname = buf + ((BUFSIZ - 64) / 3); |
| 175 | type = buf + (((BUFSIZ - 64) * 2) / 3); |
| 176 | bzero((char *)&dst, sizeof (dst)); |
| 177 | bzero((char *)&gate, sizeof (gate)); |
| 178 | /* format: {net | host} XX gateway XX metric DD [passive]\n */ |
| 179 | #define readentry(fp) \ |
| 180 | fscanf((fp), "%s %s gateway %s metric %d %s\n", \ |
| 181 | type, dname, gname, &metric, qual) |
| 182 | for (;;) { |
| 183 | if (readentry(fp) == EOF) |
| 184 | break; |
| 185 | if (!getnetorhostname(type, dname, &dst)) |
| 186 | continue; |
| 187 | if (!gethostnameornumber(gname, &gate)) |
| 188 | continue; |
| 189 | ifp = (struct interface *)malloc(sizeof (*ifp)); |
| 190 | bzero((char *)ifp, sizeof (*ifp)); |
| 191 | ifp->int_flags = IFF_REMOTE; |
| 192 | /* can't identify broadcast capability */ |
| 193 | ifp->int_net = inet_netof(dst.sin_addr); |
| 194 | if (strcmp(type, "host") == 0) { |
| 195 | ifp->int_flags |= IFF_POINTOPOINT; |
| 196 | ifp->int_dstaddr = *((struct sockaddr *)&dst); |
| 197 | } |
| 198 | if (strcmp(qual, "passive") == 0) |
| 199 | ifp->int_flags |= IFF_PASSIVE; |
| 200 | else |
| 201 | /* assume no duplicate entries */ |
| 202 | externalinterfaces++; |
| 203 | ifp->int_addr = *((struct sockaddr *)&gate); |
| 204 | ifp->int_metric = metric; |
| 205 | ifp->int_next = ifnet; |
| 206 | ifnet = ifp; |
| 207 | addrouteforif(ifp); |
| 208 | } |
| 209 | fclose(fp); |
| 210 | } |
| 211 | |
| 212 | getnetorhostname(type, name, sin) |
| 213 | char *type, *name; |
| 214 | struct sockaddr_in *sin; |
| 215 | { |
| 216 | |
| 217 | if (strcmp(type, "net") == 0) { |
| 218 | struct netent *np = getnetbyname(name); |
| 219 | int n; |
| 220 | |
| 221 | if (np == 0) |
| 222 | n = inet_network(name); |
| 223 | else { |
| 224 | if (np->n_addrtype != AF_INET) |
| 225 | return (0); |
| 226 | n = np->n_net; |
| 227 | } |
| 228 | sin->sin_family = AF_INET; |
| 229 | sin->sin_addr = inet_makeaddr(n, INADDR_ANY); |
| 230 | return (1); |
| 231 | } |
| 232 | if (strcmp(type, "host") == 0) { |
| 233 | struct hostent *hp = gethostbyname(name); |
| 234 | |
| 235 | if (hp == 0) |
| 236 | sin->sin_addr.s_addr = inet_addr(name); |
| 237 | else { |
| 238 | if (hp->h_addrtype != AF_INET) |
| 239 | return (0); |
| 240 | bcopy(hp->h_addr, &sin->sin_addr, hp->h_length); |
| 241 | } |
| 242 | sin->sin_family = AF_INET; |
| 243 | return (1); |
| 244 | } |
| 245 | return (0); |
| 246 | } |
| 247 | |
| 248 | gethostnameornumber(name, sin) |
| 249 | char *name; |
| 250 | struct sockaddr_in *sin; |
| 251 | { |
| 252 | struct hostent *hp; |
| 253 | |
| 254 | hp = gethostbyname(name); |
| 255 | if (hp) { |
| 256 | bcopy(hp->h_addr, &sin->sin_addr, hp->h_length); |
| 257 | sin->sin_family = hp->h_addrtype; |
| 258 | return (1); |
| 259 | } |
| 260 | sin->sin_addr.s_addr = inet_addr(name); |
| 261 | sin->sin_family = AF_INET; |
| 262 | return (sin->sin_addr.s_addr != -1); |
| 263 | } |