1 #ifndef lint 2 static char sccsid[] = "@(#)htable.c 4.10 (Berkeley) 02/09/84"; 3 #endif 4 5 /* 6 * htable - convert NIC host table into a UNIX format. 7 * NIC format is described in RFC 810, 1 March 1982. 8 */ 9 #include <stdio.h> 10 #include <ctype.h> 11 #include <errno.h> 12 #include <netdb.h> 13 14 #include "htable.h" /* includes <sys/types.h> */ 15 16 #include <sys/socket.h> 17 #include <netinet/in.h> 18 19 #define DATELINES 3 /* these lines usually contain the date */ 20 #define MAXNETS 30 /* array size for local, connected nets */ 21 22 FILE *hf; /* hosts file */ 23 FILE *gf; /* gateways file */ 24 FILE *nf; /* networks file */ 25 struct gateway *savegateway(), *gatewayto(); 26 27 int connected_nets[MAXNETS]; 28 int nconnected; 29 int local_nets[MAXNETS]; 30 int nlocal; 31 char *myname; 32 33 main(argc, argv) 34 int argc; 35 char *argv[]; 36 { 37 int errs; 38 39 infile = "(stdin)"; 40 myname = argv[0]; 41 argc--; 42 argv++; 43 while (argc--) { 44 if (*argv[0] == '-') { 45 switch (argv[0][1]) { 46 case 'c': 47 nconnected = addlocal(argv[1], connected_nets); 48 argv++; 49 argc--; 50 break; 51 case 'l': 52 nlocal = addlocal(argv[1], local_nets); 53 argv++; 54 argc--; 55 break; 56 default: 57 usage(); 58 /*NOTREACHED*/ 59 } 60 } else { 61 infile = argv[0]; 62 if (freopen(infile, "r", stdin) == NULL) { 63 perror(infile); 64 exit(1); 65 } 66 } 67 argv++; 68 } 69 hf = fopen("hosts", "w"); 70 if (hf == NULL) { 71 perror("hosts"); 72 exit(1); 73 } 74 copylocal(hf, "localhosts"); 75 gf = fopen("gateways", "w"); 76 if (gf == NULL) { 77 perror("gateways"); 78 exit(1); 79 } 80 copygateways(gf, "localgateways"); 81 nf = fopen("networks", "w"); 82 if (nf == NULL) { 83 perror("networks"); 84 exit(1); 85 } 86 copylocal(nf, "localnetworks"); 87 copycomments(stdin, hf, DATELINES); 88 errs = yyparse(); 89 dogateways(); 90 exit(errs); 91 } 92 93 usage() 94 { 95 fprintf(stderr, 96 "usage: %s [ -c connected-nets ] [-l local-nets ] [ input-file ]\n", 97 myname); 98 exit(1); 99 } 100 101 /* 102 * Turn a comma-separated list of network names or numbers in dot notation 103 * (e.g. "arpanet, 128.32") into an array of net numbers. 104 */ 105 addlocal(arg, nets) 106 char *arg; 107 int *nets; 108 { 109 register char *p, c; 110 register int nfound = 0; 111 112 do { 113 p = arg; 114 while (*p && *p != ',' && !isspace(*p)) 115 p++; 116 c = *p; 117 *p = 0; 118 while (*arg && isspace(*arg)) 119 arg++; 120 if (*arg == 0) 121 continue; 122 if (nfound == MAXNETS) { 123 fprintf(stderr, "%s: Too many networks in list\n", 124 myname); 125 return (nfound); 126 } 127 if (getnetaddr(arg, &nets[nfound])) 128 nfound++; 129 else { 130 fprintf(stderr, "%s: %s: unknown network\n", 131 myname, arg); 132 exit(1); 133 } 134 arg = p + 1; 135 } while (c); 136 return (nfound); 137 } 138 139 struct name * 140 newname(str) 141 char *str; 142 { 143 char *p; 144 struct name *nm; 145 146 p = malloc(strlen(str) + 1); 147 strcpy(p, str); 148 nm = (struct name *)malloc(sizeof (struct name)); 149 nm->name_val = p; 150 nm->name_link = NONAME; 151 return (nm); 152 } 153 154 char * 155 lower(str) 156 char *str; 157 { 158 register char *cp = str; 159 160 while (*cp) { 161 if (isupper(*cp)) 162 *cp = tolower(*cp); 163 cp++; 164 } 165 return (str); 166 } 167 168 do_entry(keyword, addrlist, namelist, cputype, opsys, protos) 169 int keyword; 170 struct addr *addrlist; 171 struct name *namelist, *cputype, *opsys, *protos; 172 { 173 register struct addr *al, *al2; 174 register struct name *nl; 175 struct addr *connect_addr; 176 char *cp; 177 178 switch (keyword) { 179 180 case KW_NET: 181 nl = namelist; 182 if (nl == NONAME) { 183 fprintf(stderr, "htable: net"); 184 putnet(stderr, inet_netof(addrlist->addr_val)); 185 fprintf(stderr, " missing names.\n"); 186 break; 187 } 188 fprintf(nf, "%-16.16s", lower(nl->name_val)); 189 al2 = addrlist; 190 while (al = al2) { 191 char *cp; 192 193 putnet(nf, inet_netof(al->addr_val)); 194 cp = "\t%s"; 195 while (nl = nl->name_link) { 196 fprintf(nf, cp, lower(nl->name_val)); 197 cp = " %s"; 198 } 199 putc('\n', nf); 200 al2 = al->addr_link; 201 free((char *)al); 202 } 203 break; 204 205 case KW_GATEWAY: 206 /* locate locally connected address, if one */ 207 for (al = addrlist; al; al = al->addr_link) 208 if (connectedto(inet_netof(al->addr_val))) 209 break; 210 if (al == NULL) { 211 /* 212 * Not connected to known networks. Save for later. 213 */ 214 struct gateway *gw, *firstgw = (struct gateway *) NULL; 215 216 for (al = addrlist; al; al = al->addr_link) { 217 register int net; 218 219 net = inet_netof(al->addr_val); 220 gw = savegateway(namelist, net, 221 al->addr_val, 0); 222 if (firstgw == (struct gateway *) NULL) 223 firstgw = gw; 224 gw->g_firstent = firstgw; 225 } 226 freeaddrs(addrlist); 227 goto dontfree; 228 } 229 /* 230 * Connected to a known network. 231 * Mark this as the gateway to all other networks 232 * that are on the addrlist (unless we already have 233 * gateways to them). 234 */ 235 connect_addr = al; 236 for (al = addrlist; al; al = al->addr_link) { 237 register int net; 238 239 /* suppress duplicates -- not optimal */ 240 net = inet_netof(al->addr_val); 241 if (connectedto(net) || gatewayto(net)) 242 continue; 243 printgateway(net, namelist->name_val, 1); 244 (void) savegateway(namelist, net, al->addr_val, 1); 245 } 246 /* 247 * Put the gateway in the hosts file. 248 */ 249 putaddr(hf, connect_addr->addr_val); 250 cp = "%s"; 251 for (nl = namelist; nl; nl = nl->name_link) { 252 fprintf(hf, cp, lower(nl->name_val)); 253 cp = " %s"; 254 } 255 fprintf(hf, "\t# gateway\n"); 256 freeaddrs(addrlist); 257 goto dontfree; 258 259 case KW_HOST: 260 al2 = addrlist; 261 while (al = al2) { 262 if (!local(inet_netof(al->addr_val))) { 263 char *cp; 264 265 putaddr(hf, al->addr_val); 266 cp = "%s"; 267 for (nl = namelist; nl; nl = nl->name_link) { 268 fprintf(hf, cp, lower(nl->name_val)); 269 cp = " %s"; 270 } 271 putc('\n', hf); 272 } 273 al2 = al->addr_link; 274 free((char *)al); 275 } 276 break; 277 278 default: 279 fprintf(stderr, "Unknown keyword: %d.\n", keyword); 280 } 281 freenames(namelist); 282 dontfree: 283 freenames(protos); 284 } 285 286 printgateway(net, name, metric) 287 int net; 288 char *name; 289 int metric; 290 { 291 struct netent *np; 292 293 fprintf(gf, "net "); 294 np = getnetbyaddr(net, AF_INET); 295 if (np) 296 fprintf(gf, "%s", np->n_name); 297 else 298 putnet(gf, net); 299 fprintf(gf, " gateway %s metric %d passive\n", 300 lower(name), metric); 301 } 302 303 copylocal(f, filename) 304 FILE *f; 305 char *filename; 306 { 307 register FILE *lhf; 308 register cc; 309 char buf[BUFSIZ]; 310 extern int errno; 311 312 lhf = fopen(filename, "r"); 313 if (lhf == NULL) { 314 if (errno != ENOENT) { 315 perror(filename); 316 exit(1); 317 } 318 fprintf(stderr, "Warning, no %s file.\n", filename); 319 return; 320 } 321 while (cc = fread(buf, 1, sizeof(buf), lhf)) 322 fwrite(buf, 1, cc, f); 323 fclose(lhf); 324 } 325 326 copygateways(f, filename) 327 FILE *f; 328 char *filename; 329 { 330 register FILE *lhf; 331 struct name *nl; 332 char type[80]; 333 char dname[80]; 334 char gname[80]; 335 char junk[80]; 336 u_long addr; 337 int net, metric; 338 extern int errno; 339 340 lhf = fopen(filename, "r"); 341 if (lhf == NULL) { 342 if (errno != ENOENT) { 343 perror(filename); 344 exit(1); 345 } 346 fprintf(stderr, "Warning, no %s file.\n", filename); 347 return; 348 } 349 /* format: {net | host} XX gateway XX metric DD [passive]\n */ 350 #define readentry(fp) \ 351 fscanf((fp), "%s %s gateway %s metric %d %s\n", \ 352 type, dname, gname, &metric, junk) 353 for (;;) { 354 junk[0] = 0; 355 if (readentry(lhf) == EOF) 356 break; 357 if (strcmp(type, "net")) 358 goto dumpit; 359 if (!getnetaddr(dname, &net)) 360 goto dumpit; 361 if (!gethostaddr(gname, &addr)) 362 goto dumpit; 363 nl = newname(gname); 364 (void) savegateway(nl, net, addr, metric); 365 dumpit: 366 fprintf(gf, "%s %s gateway %s metric %d %s\n", 367 type, dname, gname, metric, junk); 368 } 369 fclose(lhf); 370 } 371 372 getnetaddr(name, addr) 373 char *name; 374 int *addr; 375 { 376 struct netent *np = getnetbyname(name); 377 int n; 378 379 if (np == 0) { 380 *addr = inet_network(name); 381 return (*addr != -1); 382 } else { 383 if (np->n_addrtype != AF_INET) 384 return (0); 385 *addr = np->n_net; 386 return (1); 387 } 388 } 389 390 gethostaddr(name, addr) 391 char *name; 392 u_long *addr; 393 { 394 struct hostent *hp; 395 396 hp = gethostbyname(name); 397 if (hp) { 398 *addr = *(u_long *)(hp->h_addr); 399 return (1); 400 } 401 *addr = inet_addr(name); 402 return (*addr != -1); 403 } 404 405 copycomments(in, out, ccount) 406 FILE *in, *out; 407 int ccount; 408 { 409 char buf[BUFSIZ]; 410 int length; 411 int count; 412 char *fgets(); 413 414 for (count=0; count < ccount; count++) { 415 if ((fgets(buf, sizeof(buf), in) == NULL) || (buf[0] != ';')) 416 return; 417 buf[0] = '#'; 418 fputs(buf, out); 419 } 420 return; 421 } 422 #define UC(b) (((int)(b))&0xff) 423 424 /* 425 * Print network number in internet-standard dot notation; 426 * v is in host byte order. 427 */ 428 putnet(f, v) 429 FILE *f; 430 register int v; 431 { 432 if (v < 128) 433 fprintf(f, "%d", v); 434 else if (v < 65536) 435 fprintf(f, "%d.%d", UC(v >> 8), UC(v)); 436 else 437 fprintf(f, "%d.%d.%d", UC(v >> 16), UC(v >> 8), UC(v)); 438 } 439 440 putaddr(f, v) 441 FILE *f; 442 u_long v; 443 { 444 register char *a = (char *)&v; 445 char buf[32]; 446 447 sprintf(buf,"%d.%d.%d.%d", UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3])); 448 fprintf(f, "%-16.16s", buf); 449 } 450 451 freenames(list) 452 struct name *list; 453 { 454 register struct name *nl, *nl2; 455 456 nl2 = list; 457 while (nl = nl2) { 458 nl2 = nl->name_link; 459 free(nl->name_val); 460 free((char *)nl); 461 } 462 } 463 464 freeaddrs(list) 465 struct addr *list; 466 { 467 register struct addr *al, *al2; 468 469 al2 = list; 470 while (al = al2) 471 al2 = al->addr_link, free((char *)al); 472 } 473 474 struct gateway *gateways = 0; 475 struct gateway *lastgateway = 0; 476 477 struct gateway * 478 gatewayto(net) 479 register int net; 480 { 481 register struct gateway *gp; 482 483 for (gp = gateways; gp; gp = gp->g_link) 484 if ((gp->g_net == net) && (gp->g_metric > 0)) 485 return (gp); 486 return ((struct gateway *) NULL); 487 } 488 489 struct gateway * 490 savegateway(namelist, net, addr, metric) 491 struct name *namelist; 492 u_long addr; 493 int net, metric; 494 { 495 register struct gateway *gp; 496 497 gp = (struct gateway *)malloc(sizeof (struct gateway)); 498 if (gp == 0) { 499 fprintf(stderr, "htable: out of memory\n"); 500 exit(1); 501 } 502 gp->g_link = (struct gateway *) NULL; 503 if (lastgateway) 504 lastgateway->g_link = gp; 505 else 506 gateways = gp; 507 lastgateway = gp; 508 gp->g_name = namelist; 509 gp->g_net = net; 510 gp->g_addr = addr; 511 gp->g_metric = metric; 512 if (metric == 1) 513 gp->g_dst = gp; 514 } 515 516 connectedto(net) 517 u_long net; 518 { 519 register i; 520 521 for (i = 0; i < nconnected; i++) 522 if (connected_nets[i] == net) 523 return(1); 524 return(0); 525 } 526 527 local(net) 528 u_long net; 529 { 530 register i; 531 532 for (i = 0; i < nlocal; i++) 533 if (local_nets[i] == net) 534 return(1); 535 return(0); 536 } 537 538 #define MAXHOPS 10 539 540 /* 541 * Go through list of gateways, finding connections for gateways 542 * that are not yet connected. 543 */ 544 dogateways() 545 { 546 register struct gateway *gp, *gw, *ggp; 547 register int hops, changed = 1; 548 struct name *nl; 549 char *cp; 550 551 for (hops = 0; hops < MAXHOPS && changed; hops++, changed = 0) { 552 for (gp = gateways; gp; gp = gp->g_link) 553 if ((gp->g_metric == 0) && (gw = gatewayto(gp->g_net))) { 554 /* 555 * Found a new connection. 556 * For each other network that this gateway is on, 557 * add a new gateway to that network. 558 */ 559 changed = 1; 560 gp->g_dst = gw->g_dst; 561 gp->g_metric = gw->g_metric + 1; 562 for (ggp = gp->g_firstent; ggp->g_name == gp->g_name; 563 ggp = ggp->g_link) { 564 if (ggp == gp) 565 continue; 566 if (gatewayto(ggp->g_net)) 567 continue; 568 ggp->g_dst = gp->g_dst; 569 ggp->g_metric = gp->g_metric; 570 printgateway(ggp->g_net, 571 gw->g_dst->g_name->name_val, gp->g_metric); 572 } 573 /* 574 * Put the gateway in the hosts file, 575 * using the address for the connected net. 576 */ 577 putaddr(hf, gp->g_addr); 578 cp = "%s"; 579 for (nl = gp->g_name; nl; nl = nl->name_link) { 580 fprintf(hf, cp, lower(nl->name_val)); 581 cp = " %s"; 582 } 583 fprintf(hf, "\t# gateway\n"); 584 } 585 } 586 } 587