parms.c revision 1.6
1 /* $NetBSD: parms.c,v 1.6 1997/09/15 10:38:17 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #if !defined(lint) && !defined(sgi) && !defined(__NetBSD__) 37 static char sccsid[] = "@(#)if.c 8.1 (Berkeley) 6/5/93"; 38 #elif defined(__NetBSD__) 39 #include <sys/cdefs.h> 40 __RCSID("$NetBSD: parms.c,v 1.6 1997/09/15 10:38:17 lukem Exp $"); 41 #endif 42 43 #include "defs.h" 44 #include "pathnames.h" 45 #include <sys/stat.h> 46 47 48 struct parm *parms; 49 struct intnet *intnets; 50 struct tgate *tgates; 51 52 53 /* use configured parameters 54 */ 55 void 56 get_parms(struct interface *ifp) 57 { 58 static warned_auth_in, warned_auth_out; 59 struct parm *parmp; 60 int i, num_passwds = 0; 61 62 /* get all relevant parameters 63 */ 64 for (parmp = parms; parmp != 0; parmp = parmp->parm_next) { 65 if (parmp->parm_name[0] == '\0' 66 || !strcmp(ifp->int_name, parmp->parm_name) 67 || (parmp->parm_name[0] == '\n' 68 && on_net(ifp->int_addr, 69 parmp->parm_net, parmp->parm_mask))) { 70 71 /* This group of parameters is relevant, 72 * so get its settings 73 */ 74 ifp->int_state |= parmp->parm_int_state; 75 for (i = 0; i < MAX_AUTH_KEYS; i++) { 76 if (parmp->parm_auth[0].type == RIP_AUTH_NONE 77 || num_passwds >= MAX_AUTH_KEYS) 78 break; 79 bcopy(&parmp->parm_auth[i], 80 &ifp->int_auth[num_passwds++], 81 sizeof(ifp->int_auth[0])); 82 } 83 if (parmp->parm_rdisc_pref != 0) 84 ifp->int_rdisc_pref = parmp->parm_rdisc_pref; 85 if (parmp->parm_rdisc_int != 0) 86 ifp->int_rdisc_int = parmp->parm_rdisc_int; 87 if (parmp->parm_d_metric != 0) 88 ifp->int_d_metric = parmp->parm_d_metric; 89 } 90 } 91 92 /* Set general defaults. 93 * 94 * Default poor-man's router discovery to a metric that will 95 * be heard by old versions of `routed`. They ignored received 96 * routes with metric 15. 97 */ 98 if ((ifp->int_state & IS_PM_RDISC) 99 && ifp->int_d_metric == 0) 100 ifp->int_d_metric = FAKE_METRIC; 101 102 if (ifp->int_rdisc_int == 0) 103 ifp->int_rdisc_int = DefMaxAdvertiseInterval; 104 105 if (!(ifp->int_if_flags & IFF_MULTICAST) 106 && !(ifp->int_state & IS_REMOTE)) 107 ifp->int_state |= IS_BCAST_RDISC; 108 109 if (ifp->int_if_flags & IFF_POINTOPOINT) { 110 ifp->int_state |= IS_BCAST_RDISC; 111 /* By default, point-to-point links should be passive 112 * about router-discovery for the sake of demand-dialing. 113 */ 114 if (0 == (ifp->int_state & GROUP_IS_SOL)) 115 ifp->int_state |= IS_NO_SOL_OUT; 116 if (0 == (ifp->int_state & GROUP_IS_ADV)) 117 ifp->int_state |= IS_NO_ADV_OUT; 118 } 119 120 if (0 != (ifp->int_state & (IS_PASSIVE | IS_REMOTE))) 121 ifp->int_state |= IS_NO_RDISC; 122 if (ifp->int_state & IS_PASSIVE) 123 ifp->int_state |= IS_NO_RIP; 124 125 if (!IS_RIP_IN_OFF(ifp->int_state) 126 && ifp->int_auth[0].type != RIP_AUTH_NONE 127 && !(ifp->int_state & IS_NO_RIPV1_IN) 128 && !warned_auth_in) { 129 msglog("Warning: RIPv1 input via %s" 130 " will be accepted without authentication", 131 ifp->int_name); 132 warned_auth_in = 1; 133 } 134 if (!IS_RIP_OUT_OFF(ifp->int_state) 135 && ifp->int_auth[0].type != RIP_AUTH_NONE 136 && !(ifp->int_state & IS_NO_RIPV1_OUT)) { 137 if (!warned_auth_out) { 138 msglog("Warning: RIPv1 output via %s" 139 " will be sent without authentication", 140 ifp->int_name); 141 warned_auth_out = 1; 142 } 143 } 144 } 145 146 147 /* Read a list of gateways from /etc/gateways and add them to our tables. 148 * 149 * This file contains a list of "remote" gateways. That is usually 150 * a gateway which we cannot immediately determine if it is present or 151 * not as we can do for those provided by directly connected hardware. 152 * 153 * If a gateway is marked "passive" in the file, then we assume it 154 * does not understand RIP and assume it is always present. Those 155 * not marked passive are treated as if they were directly connected 156 * and assumed to be broken if they do not send us advertisements. 157 * All remote interfaces are added to our list, and those not marked 158 * passive are sent routing updates. 159 * 160 * A passive interface can also be local, hardware interface exempt 161 * from RIP. 162 */ 163 void 164 gwkludge(void) 165 { 166 FILE *fp; 167 char *p, *lptr; 168 char lbuf[200], net_host[5], dname[64+1+64+1], gname[64+1], qual[9]; 169 struct interface *ifp; 170 naddr dst, netmask, gate; 171 int metric, n; 172 struct stat sb; 173 u_int state; 174 char *type; 175 176 177 fp = fopen(_PATH_GATEWAYS, "r"); 178 if (fp == 0) 179 return; 180 181 if (0 > fstat(fileno(fp), &sb)) { 182 msglog("could not stat() "_PATH_GATEWAYS); 183 (void)fclose(fp); 184 return; 185 } 186 187 for (;;) { 188 if (0 == fgets(lbuf, sizeof(lbuf)-1, fp)) 189 break; 190 lptr = lbuf; 191 while (*lptr == ' ') 192 lptr++; 193 if (*lptr == '\n' /* ignore null and comment lines */ 194 || *lptr == '#') 195 continue; 196 p = lptr+strlen(lptr)-1; 197 while (*p == '\n' || *p == ' ') 198 *p-- = '\0'; 199 200 /* notice newfangled parameter lines 201 */ 202 if (strncasecmp("net", lptr, 3) 203 && strncasecmp("host", lptr, 4)) { 204 p = parse_parms(lptr, 205 (sb.st_uid == 0 206 && !(sb.st_mode&(S_IRWXG|S_IRWXO)))); 207 if (p != 0) { 208 if (strcasecmp(p,lptr)) 209 msglog("%s in "_PATH_GATEWAYS 210 " entry \"%s\"", p, lptr); 211 else 212 msglog("bad \"%s\" in "_PATH_GATEWAYS, 213 lptr); 214 } 215 continue; 216 } 217 218 /* {net | host} XX[/M] XX gateway XX metric DD [passive | external]\n */ 219 qual[0] = '\0'; 220 n = sscanf(lptr, "%4s %129[^ \t] gateway" 221 " %64[^ / \t] metric %u %8s\n", 222 net_host, dname, gname, &metric, qual); 223 if (n != 4 && n != 5) { 224 msglog("bad "_PATH_GATEWAYS" entry \"%s\"; %d values", 225 lptr, n); 226 continue; 227 } 228 if (metric >= HOPCNT_INFINITY) { 229 msglog("bad metric in "_PATH_GATEWAYS" entry \"%s\"", 230 lptr); 231 continue; 232 } 233 if (!strcasecmp(net_host, "host")) { 234 if (!gethost(dname, &dst)) { 235 msglog("bad host \"%s\" in "_PATH_GATEWAYS 236 " entry \"%s\"", dname, lptr); 237 continue; 238 } 239 netmask = HOST_MASK; 240 } else if (!strcasecmp(net_host, "net")) { 241 if (!getnet(dname, &dst, &netmask)) { 242 msglog("bad net \"%s\" in "_PATH_GATEWAYS 243 " entry \"%s\"", dname, lptr); 244 continue; 245 } 246 HTONL(dst); /* make network # into IP address */ 247 } else { 248 msglog("bad \"%s\" in "_PATH_GATEWAYS 249 " entry \"%s\"", lptr); 250 continue; 251 } 252 253 if (!gethost(gname, &gate)) { 254 msglog("bad gateway \"%s\" in "_PATH_GATEWAYS 255 " entry \"%s\"", gname, lptr); 256 continue; 257 } 258 259 if (!strcasecmp(qual, type = "passive")) { 260 /* Passive entries are not placed in our tables, 261 * only the kernel's, so we don't copy all of the 262 * external routing information within a net. 263 * Internal machines should use the default 264 * route to a suitable gateway (like us). 265 */ 266 state = IS_REMOTE | IS_PASSIVE; 267 if (metric == 0) 268 metric = 1; 269 270 } else if (!strcasecmp(qual, type = "external")) { 271 /* External entries are handled by other means 272 * such as EGP, and are placed only in the daemon 273 * tables to prevent overriding them with something 274 * else. 275 */ 276 strcpy(qual,"external"); 277 state = IS_REMOTE | IS_PASSIVE | IS_EXTERNAL; 278 if (metric == 0) 279 metric = 1; 280 281 } else if (!strcasecmp(qual, "active") 282 || qual[0] == '\0') { 283 if (metric != 0) { 284 /* Entries that are neither "passive" nor 285 * "external" are "remote" and must behave 286 * like physical interfaces. If they are not 287 * heard from regularly, they are deleted. 288 */ 289 state = IS_REMOTE; 290 type = "remote"; 291 } else { 292 /* "remote" entries with a metric of 0 293 * are aliases for our own interfaces 294 */ 295 state = IS_REMOTE | IS_PASSIVE | IS_ALIAS; 296 type = "alias"; 297 } 298 299 } else { 300 msglog("bad "_PATH_GATEWAYS" entry \"%s\";" 301 " unknown type %s", lptr, qual); 302 continue; 303 } 304 305 if (0 != (state & (IS_PASSIVE | IS_REMOTE))) 306 state |= IS_NO_RDISC; 307 if (state & IS_PASSIVE) 308 state |= IS_NO_RIP; 309 310 ifp = check_dup(gate,dst,netmask,0); 311 if (ifp != 0) { 312 msglog("duplicate "_PATH_GATEWAYS" entry \"%s\"",lptr); 313 continue; 314 } 315 316 ifp = (struct interface *)malloc(sizeof(*ifp)); 317 memset(ifp, 0, sizeof(*ifp)); 318 319 ifp->int_state = state; 320 if (netmask == HOST_MASK) 321 ifp->int_if_flags = IFF_POINTOPOINT | IFF_UP_RUNNING; 322 else 323 ifp->int_if_flags = IFF_UP_RUNNING; 324 ifp->int_act_time = NEVER; 325 ifp->int_addr = gate; 326 ifp->int_dstaddr = dst; 327 ifp->int_mask = netmask; 328 ifp->int_ripv1_mask = netmask; 329 ifp->int_std_mask = std_mask(gate); 330 ifp->int_net = ntohl(dst); 331 ifp->int_std_net = ifp->int_net & ifp->int_std_mask; 332 ifp->int_std_addr = htonl(ifp->int_std_net); 333 ifp->int_metric = metric; 334 if (!(state & IS_EXTERNAL) 335 && ifp->int_mask != ifp->int_std_mask) 336 ifp->int_state |= IS_SUBNET; 337 (void)sprintf(ifp->int_name, "%s(%s)", type, gname); 338 ifp->int_index = -1; 339 340 if_link(ifp); 341 } 342 343 /* After all of the parameter lines have been read, 344 * apply them to any remote interfaces. 345 */ 346 for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next) { 347 get_parms(ifp); 348 349 tot_interfaces++; 350 if (!IS_RIP_OFF(ifp->int_state)) 351 rip_interfaces++; 352 353 trace_if("Add", ifp); 354 } 355 356 (void)fclose(fp); 357 } 358 359 360 /* strtok(), but honoring backslash 361 */ 362 static int /* 0=ok, -1=bad */ 363 parse_quote(char **linep, 364 char *delims, 365 char *delimp, 366 char *buf, 367 int lim) 368 { 369 char c, *pc, *p; 370 371 372 pc = *linep; 373 if (*pc == '\0') 374 return -1; 375 376 while (lim != 0) { 377 c = *pc++; 378 if (c == '\0') 379 break; 380 381 if (c == '\\' && pc != '\0') { 382 if ((c = *pc++) == 'n') { 383 c = '\n'; 384 } else if (c == 'r') { 385 c = '\r'; 386 } else if (c == 't') { 387 c = '\t'; 388 } else if (c == 'b') { 389 c = '\b'; 390 } else if (c >= '0' && c <= '7') { 391 c -= '0'; 392 if (*pc >= '0' && *pc <= '7') { 393 c = (c<<3)+(*pc++ - '0'); 394 if (*pc >= '0' && *pc <= '7') 395 c = (c<<3)+(*pc++ - '0'); 396 } 397 } 398 399 } else { 400 for (p = delims; *p != '\0'; ++p) { 401 if (*p == c) 402 goto exit; 403 } 404 } 405 406 *buf++ = c; 407 --lim; 408 } 409 exit: 410 if (lim == 0) 411 return -1; 412 413 *buf = '\0'; 414 if (delimp != 0) 415 *delimp = c; 416 *linep = pc-1; 417 return 0; 418 } 419 420 421 /* Parse password timestamp 422 */ 423 static char * 424 parse_ts(time_t *tp, 425 char **valp, 426 char *val0, 427 char *delimp, 428 char *buf, 429 u_int bufsize) 430 { 431 struct tm tm; 432 433 if (0 > parse_quote(valp, "| ,\n\r", delimp, 434 buf,bufsize) 435 || buf[bufsize-1] != '\0' 436 || buf[bufsize-2] != '\0') { 437 sprintf(buf,"bad timestamp %.25s", val0); 438 return buf; 439 } 440 strcat(buf,"\n"); 441 memset(&tm, 0, sizeof(tm)); 442 if (5 != sscanf(buf, "%u/%u/%u@%u:%u\n", 443 &tm.tm_year, &tm.tm_mon, &tm.tm_mday, 444 &tm.tm_hour, &tm.tm_min)) { 445 sprintf(buf,"bad timestamp %.25s", val0); 446 return buf; 447 } 448 if (tm.tm_year <= 37) 449 tm.tm_year += 100; 450 451 if ((*tp = mktime(&tm)) == -1) { 452 sprintf(buf,"bad timestamp %.25s", val0); 453 return buf; 454 } 455 456 return 0; 457 } 458 459 460 /* Get a password, key ID, and expiration date in the format 461 * passwd|keyID|year/mon/day@hour:min|year/mon/day@hour:min 462 */ 463 static char * /* 0 or error message */ 464 get_passwd(char *tgt, 465 char *val, 466 struct parm *parmp, 467 u_char type, 468 int safe) /* 1=from secure file */ 469 { 470 static char buf[80]; 471 char *val0, *p, delim; 472 struct auth k, *ap, *ap2; 473 int i; 474 u_long l; 475 476 477 if (!safe) 478 return "ignore unsafe password"; 479 480 for (ap = parmp->parm_auth, i = 0; 481 ap->type != RIP_AUTH_NONE; i++, ap++) { 482 if (i >= MAX_AUTH_KEYS) 483 return "too many passwords"; 484 } 485 486 memset(&k, 0, sizeof(k)); 487 k.type = type; 488 k.end = -1-DAY; 489 490 val0 = val; 491 if (0 > parse_quote(&val, "| ,\n\r", &delim, 492 (char *)k.key, sizeof(k.key))) 493 return tgt; 494 495 if (delim != '|') { 496 if (type == RIP_AUTH_MD5) 497 return "missing Keyid"; 498 } else { 499 val0 = ++val; 500 buf[sizeof(buf)-1] = '\0'; 501 if (0 > parse_quote(&val, "| ,\n\r", &delim, buf,sizeof(buf)) 502 || buf[sizeof(buf)-1] != '\0' 503 || (l = strtoul(buf,&p,0)) > 255 504 || *p != '\0') { 505 sprintf(buf,"bad KeyID \"%.20s\"", val0); 506 return buf; 507 } 508 for (ap2 = parmp->parm_auth; ap2 < ap; ap2++) { 509 if (ap2->keyid == l) { 510 sprintf(buf,"duplicate KeyID \"%.20s\"", val0); 511 return buf; 512 } 513 } 514 k.keyid = (int)l; 515 516 if (delim == '|') { 517 val0 = ++val; 518 if (0 != (p = parse_ts(&k.start,&val,val0,&delim, 519 buf,sizeof(buf)))) 520 return p; 521 if (delim != '|') 522 return "missing second timestamp"; 523 val0 = ++val; 524 if (0 != (p = parse_ts(&k.end,&val,val0,&delim, 525 buf,sizeof(buf)))) 526 return p; 527 if ((u_long)k.start > (u_long)k.end) { 528 sprintf(buf,"out of order timestamp %.30s", 529 val0); 530 return buf; 531 } 532 } 533 } 534 if (delim != '\0') 535 return tgt; 536 537 bcopy(&k, ap, sizeof(*ap)); 538 return 0; 539 } 540 541 542 /* Parse a set of parameters for an interface. 543 */ 544 char * /* 0 or error message */ 545 parse_parms(char *line, 546 int safe) /* 1=from secure file */ 547 { 548 #define PARS(str) (!strcasecmp(tgt, str)) 549 #define PARSEQ(str) (!strncasecmp(tgt, str"=", sizeof(str))) 550 #define CKF(g,b) {if (0 != (parm.parm_int_state & ((g) & ~(b)))) break; \ 551 parm.parm_int_state |= (b);} 552 struct parm parm; 553 struct intnet *intnetp; 554 struct tgate *tg; 555 naddr addr, mask; 556 char delim, *val0 = NULL, *tgt, *val, *p; 557 char buf[64]; 558 559 560 /* "subnet=x.y.z.u/mask,metric" must be alone on the line */ 561 if (!strncasecmp(line, "subnet=", sizeof("subnet=")-1) 562 && *(val = &line[sizeof("subnet=")]) != '\0') { 563 intnetp = (struct intnet*)malloc(sizeof(*intnetp)); 564 intnetp->intnet_metric = 1; 565 if ((p = strrchr(val,','))) { 566 *p++ = '\0'; 567 intnetp->intnet_metric = (int)strtol(p,&p,0); 568 if (*p != '\0' 569 || intnetp->intnet_metric <= 0 570 || intnetp->intnet_metric >= HOPCNT_INFINITY) 571 return line; 572 } 573 if (!getnet(val, &intnetp->intnet_addr, &intnetp->intnet_mask) 574 || intnetp->intnet_mask == HOST_MASK 575 || intnetp->intnet_addr == RIP_DEFAULT) { 576 free(intnetp); 577 return line; 578 } 579 HTONL(intnetp->intnet_addr); 580 intnetp->intnet_next = intnets; 581 intnets = intnetp; 582 return 0; 583 } 584 585 memset(&parm, 0, sizeof(parm)); 586 587 tgt = "null"; 588 for (;;) { 589 tgt = line + strspn(line, " ,\n\r"); 590 if (*tgt == '\0') 591 break; 592 593 line += strcspn(tgt, "= ,\n\r"); 594 delim = *line; 595 if (delim == '=') { 596 val0 = ++line; 597 if (0 > parse_quote(&line," ,\n\r",&delim, 598 buf,sizeof(buf))) 599 return tgt; 600 } 601 if (delim != '\0') 602 *line++ = '\0'; 603 604 if (PARSEQ("if")) { 605 if (parm.parm_name[0] != '\0' 606 || strlen(buf) > IFNAMSIZ) 607 return tgt; 608 strcpy(parm.parm_name, buf); 609 610 } else if (PARSEQ("addr")) { 611 /* This is a bad idea, because the address based 612 * sets of parameters cannot be checked for 613 * consistency with the interface name parameters. 614 * The parm_net stuff is needed to allow several 615 * -F settings. 616 */ 617 if (!getnet(val0, &addr, &mask) 618 || parm.parm_name[0] != '\0') 619 return tgt; 620 parm.parm_net = addr; 621 parm.parm_mask = mask; 622 parm.parm_name[0] = '\n'; 623 624 } else if (PARSEQ("passwd")) { 625 /* since cleartext passwords are so weak allow 626 * them anywhere 627 */ 628 tgt = get_passwd(tgt,val0,&parm,RIP_AUTH_PW,1); 629 if (tgt) { 630 *val0 = '\0'; 631 return tgt; 632 } 633 634 } else if (PARSEQ("md5_passwd")) { 635 tgt = get_passwd(tgt,val0,&parm,RIP_AUTH_MD5,safe); 636 if (tgt) { 637 *val0 = '\0'; 638 return tgt; 639 } 640 641 } else if (PARS("no_ag")) { 642 parm.parm_int_state |= (IS_NO_AG | IS_NO_SUPER_AG); 643 644 } else if (PARS("no_super_ag")) { 645 parm.parm_int_state |= IS_NO_SUPER_AG; 646 647 } else if (PARS("no_ripv1_in")) { 648 parm.parm_int_state |= IS_NO_RIPV1_IN; 649 650 } else if (PARS("no_ripv2_in")) { 651 parm.parm_int_state |= IS_NO_RIPV2_IN; 652 653 } else if (PARS("ripv2_out")) { 654 if (parm.parm_int_state & IS_NO_RIPV2_OUT) 655 return tgt; 656 parm.parm_int_state |= IS_NO_RIPV1_OUT; 657 658 } else if (PARS("ripv2")) { 659 if ((parm.parm_int_state & IS_NO_RIPV2_OUT) 660 || (parm.parm_int_state & IS_NO_RIPV2_IN)) 661 return tgt; 662 parm.parm_int_state |= (IS_NO_RIPV1_IN 663 | IS_NO_RIPV1_OUT); 664 665 } else if (PARS("no_rip")) { 666 CKF(IS_PM_RDISC, IS_NO_RIP); 667 668 } else if (PARS("no_rdisc")) { 669 CKF((GROUP_IS_SOL|GROUP_IS_ADV), IS_NO_RDISC); 670 671 } else if (PARS("no_solicit")) { 672 CKF(GROUP_IS_SOL, IS_NO_SOL_OUT); 673 674 } else if (PARS("send_solicit")) { 675 CKF(GROUP_IS_SOL, IS_SOL_OUT); 676 677 } else if (PARS("no_rdisc_adv")) { 678 CKF(GROUP_IS_ADV, IS_NO_ADV_OUT); 679 680 } else if (PARS("rdisc_adv")) { 681 CKF(GROUP_IS_ADV, IS_ADV_OUT); 682 683 } else if (PARS("bcast_rdisc")) { 684 parm.parm_int_state |= IS_BCAST_RDISC; 685 686 } else if (PARS("passive")) { 687 CKF((GROUP_IS_SOL|GROUP_IS_ADV), IS_NO_RDISC); 688 parm.parm_int_state |= IS_NO_RIP; 689 690 } else if (PARSEQ("rdisc_pref")) { 691 if (parm.parm_rdisc_pref != 0 692 || (parm.parm_rdisc_pref = (int)strtoul(buf, &p,0), 693 *p != '\0')) 694 return tgt; 695 696 } else if (PARS("pm_rdisc")) { 697 if (IS_RIP_OUT_OFF(parm.parm_int_state)) 698 return tgt; 699 parm.parm_int_state |= IS_PM_RDISC; 700 701 } else if (PARSEQ("rdisc_interval")) { 702 if (parm.parm_rdisc_int != 0 703 || (parm.parm_rdisc_int = (int)strtoul(buf,&p,0), 704 *p != '\0') 705 || parm.parm_rdisc_int < MinMaxAdvertiseInterval 706 || parm.parm_rdisc_int > MaxMaxAdvertiseInterval) 707 return tgt; 708 709 } else if (PARSEQ("fake_default")) { 710 if (parm.parm_d_metric != 0 711 || IS_RIP_OUT_OFF(parm.parm_int_state) 712 || (parm.parm_d_metric = (int)strtoul(buf,&p,0), 713 *p != '\0') 714 || parm.parm_d_metric > HOPCNT_INFINITY-1) 715 return tgt; 716 717 } else if (PARSEQ("trust_gateway")) { 718 if (!gethost(buf,&addr)) 719 return tgt; 720 tg = (struct tgate *)malloc(sizeof(*tg)); 721 tg->tgate_next = tgates; 722 tg->tgate_addr = addr; 723 tgates = tg; 724 parm.parm_int_state |= IS_DISTRUST; 725 726 } else if (PARS("redirect_ok")) { 727 parm.parm_int_state |= IS_REDIRECT_OK; 728 729 } else { 730 return tgt; /* error */ 731 } 732 } 733 734 return check_parms(&parm); 735 #undef PARS 736 #undef PARSEQ 737 } 738 739 740 /* check for duplicate parameter specifications */ 741 char * /* 0 or error message */ 742 check_parms(struct parm *new) 743 { 744 struct parm *parmp, **parmpp; 745 int i, num_passwds; 746 747 /* set implicit values 748 */ 749 if (new->parm_int_state & IS_NO_ADV_IN) 750 new->parm_int_state |= IS_NO_SOL_OUT; 751 752 for (i = num_passwds = 0; i < MAX_AUTH_KEYS; i++) { 753 if (new->parm_auth[i].type != RIP_AUTH_NONE) 754 num_passwds++; 755 } 756 757 /* compare with existing sets of parameters 758 */ 759 for (parmpp = &parms; 760 (parmp = *parmpp) != 0; 761 parmpp = &parmp->parm_next) { 762 if (strcmp(new->parm_name, parmp->parm_name)) 763 continue; 764 if (!on_net(htonl(parmp->parm_net), 765 new->parm_net, new->parm_mask) 766 && !on_net(htonl(new->parm_net), 767 parmp->parm_net, parmp->parm_mask)) 768 continue; 769 770 for (i = 0; i < MAX_AUTH_KEYS; i++) { 771 if (parmp->parm_auth[i].type != RIP_AUTH_NONE) 772 num_passwds++; 773 } 774 if (num_passwds > MAX_AUTH_KEYS) 775 return "too many conflicting passwords"; 776 777 if ((0 != (new->parm_int_state & GROUP_IS_SOL) 778 && 0 != (parmp->parm_int_state & GROUP_IS_SOL) 779 && 0 != ((new->parm_int_state ^ parmp->parm_int_state) 780 && GROUP_IS_SOL)) 781 || (0 != (new->parm_int_state & GROUP_IS_ADV) 782 && 0 != (parmp->parm_int_state & GROUP_IS_ADV) 783 && 0 != ((new->parm_int_state ^ parmp->parm_int_state) 784 && GROUP_IS_ADV)) 785 || (new->parm_rdisc_pref != 0 786 && parmp->parm_rdisc_pref != 0 787 && new->parm_rdisc_pref != parmp->parm_rdisc_pref) 788 || (new->parm_rdisc_int != 0 789 && parmp->parm_rdisc_int != 0 790 && new->parm_rdisc_int != parmp->parm_rdisc_int)) { 791 return ("conflicting, duplicate router discovery" 792 " parameters"); 793 794 } 795 796 if (new->parm_d_metric != 0 797 && parmp->parm_d_metric != 0 798 && new->parm_d_metric != parmp->parm_d_metric) { 799 return ("conflicting, duplicate poor man's router" 800 " discovery or fake default metric"); 801 } 802 } 803 804 /* link new entry on the so that when the entries are scanned, 805 * they affect the result in the order the operator specified. 806 */ 807 parmp = (struct parm*)malloc(sizeof(*parmp)); 808 bcopy(new, parmp, sizeof(*parmp)); 809 *parmpp = parmp; 810 811 return 0; 812 } 813 814 815 /* get a network number as a name or a number, with an optional "/xx" 816 * netmask. 817 */ 818 int /* 0=bad */ 819 getnet(char *name, 820 naddr *netp, /* a network so host byte order */ 821 naddr *maskp) /* masks are always in host order */ 822 { 823 int i; 824 struct netent *np; 825 naddr mask; /* in host byte order */ 826 struct in_addr in; /* a network and so host byte order */ 827 char hname[MAXHOSTNAMELEN+1]; 828 char *mname, *p; 829 830 831 /* Detect and separate "1.2.3.4/24" 832 */ 833 if (0 != (mname = rindex(name,'/'))) { 834 i = (int)(mname - name); 835 if (i > sizeof(hname)-1) /* name too long */ 836 return 0; 837 bcopy(name, hname, i); 838 hname[i] = '\0'; 839 mname++; 840 name = hname; 841 } 842 843 np = getnetbyname(name); 844 if (np != 0) { 845 in.s_addr = (naddr)np->n_net; 846 } else if (inet_aton(name, &in) == 1) { 847 NTOHL(in.s_addr); 848 } else if (!mname && !strcasecmp(name,"default")) { 849 in.s_addr = RIP_DEFAULT; 850 } else { 851 return 0; 852 } 853 854 if (!mname) { 855 /* we cannot use the interfaces here because we have not 856 * looked at them yet. 857 */ 858 mask = std_mask(htonl(in.s_addr)); 859 if ((~mask & in.s_addr) != 0) 860 mask = HOST_MASK; 861 } else { 862 mask = (naddr)strtoul(mname, &p, 0); 863 if (*p != '\0' || mask > 32) 864 return 0; 865 if (mask != 0) 866 mask = HOST_MASK << (32-mask); 867 } 868 869 /* must have mask of 0 with default */ 870 if (mask != 0 && in.s_addr == RIP_DEFAULT) 871 return 0; 872 /* no host bits allowed in a network number */ 873 if ((~mask & in.s_addr) != 0) 874 return 0; 875 /* require non-zero network number */ 876 if ((mask & in.s_addr) == 0 && in.s_addr != RIP_DEFAULT) 877 return 0; 878 if (in.s_addr>>24 == 0 && in.s_addr != RIP_DEFAULT) 879 return 0; 880 if (in.s_addr>>24 == 0xff) 881 return 0; 882 883 *netp = in.s_addr; 884 *maskp = mask; 885 return 1; 886 } 887 888 889 int /* 0=bad */ 890 gethost(char *name, 891 naddr *addrp) 892 { 893 struct hostent *hp; 894 struct in_addr in; 895 896 897 /* Try for a number first, even in IRIX where gethostbyname() 898 * is smart. This avoids hitting the name server which 899 * might be sick because routing is. 900 */ 901 if (inet_aton(name, &in) == 1) { 902 /* get a good number, but check that it it makes some 903 * sense. 904 */ 905 if (ntohl(in.s_addr)>>24 == 0 906 || ntohl(in.s_addr)>>24 == 0xff) 907 return 0; 908 *addrp = in.s_addr; 909 return 1; 910 } 911 912 hp = gethostbyname(name); 913 if (hp) { 914 bcopy(hp->h_addr, addrp, sizeof(*addrp)); 915 return 1; 916 } 917 918 return 0; 919 } 920
Indexes created Thu Sep 25 02:09:54 GMT 2025