1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. 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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 #include "defs.h" 33 #include "pathnames.h" 34 #include <sys/stat.h> 35 36 #ifdef __NetBSD__ 37 __RCSID("$NetBSD$"); 38 #elif defined(__FreeBSD__) 39 __RCSID("$FreeBSD$"); 40 #else 41 __RCSID("$Revision: 2.26 $"); 42 #ident "$Revision: 2.26 $" 43 #endif 44 45 46 static struct parm *parms; 47 struct intnet *intnets; 48 struct r1net *r1nets; 49 struct tgate *tgates; 50 51 52 /* use configured parameters 53 */ 54 void 55 get_parms(struct interface *ifp) 56 { 57 static int warned_auth_in, warned_auth_out; 58 struct parm *parmp; 59 int i, num_passwds = 0; 60 61 /* get all relevant parameters 62 */ 63 for (parmp = parms; parmp != 0; parmp = parmp->parm_next) { 64 if (parmp->parm_name[0] == '\0' 65 || !strcmp(ifp->int_name, parmp->parm_name) 66 || (parmp->parm_name[0] == '\n' 67 && on_net(ifp->int_addr, 68 parmp->parm_net, parmp->parm_mask))) { 69 70 /* This group of parameters is relevant, 71 * so get its settings 72 */ 73 ifp->int_state |= parmp->parm_int_state; 74 for (i = 0; i < MAX_AUTH_KEYS; i++) { 75 if (parmp->parm_auth[0].type == RIP_AUTH_NONE 76 || num_passwds >= MAX_AUTH_KEYS) 77 break; 78 memcpy(&ifp->int_auth[num_passwds++], 79 &parmp->parm_auth[i], 80 sizeof(ifp->int_auth[0])); 81 } 82 if (parmp->parm_rdisc_pref != 0) 83 ifp->int_rdisc_pref = parmp->parm_rdisc_pref; 84 if (parmp->parm_rdisc_int != 0) 85 ifp->int_rdisc_int = parmp->parm_rdisc_int; 86 if (parmp->parm_adj_inmetric != 0) 87 ifp->int_adj_inmetric = parmp->parm_adj_inmetric; 88 if (parmp->parm_adj_outmetric != 0) 89 ifp->int_adj_outmetric = parmp->parm_adj_outmetric; 90 } 91 } 92 93 /* Set general defaults. 94 * 95 * Default poor-man's router discovery to a metric that will 96 * be heard by old versions of `routed`. They ignored received 97 * routes with metric 15. 98 */ 99 if ((ifp->int_state & IS_PM_RDISC) 100 && ifp->int_d_metric == 0) 101 ifp->int_d_metric = FAKE_METRIC; 102 103 if (ifp->int_rdisc_int == 0) 104 ifp->int_rdisc_int = DefMaxAdvertiseInterval; 105 106 if (!(ifp->int_if_flags & IFF_MULTICAST) 107 && !(ifp->int_state & IS_REMOTE)) 108 ifp->int_state |= IS_BCAST_RDISC; 109 110 if (ifp->int_if_flags & IFF_POINTOPOINT) { 111 ifp->int_state |= IS_BCAST_RDISC; 112 /* By default, point-to-point links should be passive 113 * about router-discovery for the sake of demand-dialing. 114 */ 115 if (0 == (ifp->int_state & GROUP_IS_SOL_OUT)) 116 ifp->int_state |= IS_NO_SOL_OUT; 117 if (0 == (ifp->int_state & GROUP_IS_ADV_OUT)) 118 ifp->int_state |= IS_NO_ADV_OUT; 119 } 120 121 if (0 != (ifp->int_state & (IS_PASSIVE | IS_REMOTE))) 122 ifp->int_state |= IS_NO_RDISC; 123 if (ifp->int_state & IS_PASSIVE) 124 ifp->int_state |= IS_NO_RIP; 125 126 if (!IS_RIP_IN_OFF(ifp->int_state) 127 && ifp->int_auth[0].type != RIP_AUTH_NONE 128 && !(ifp->int_state & IS_NO_RIPV1_IN) 129 && !warned_auth_in) { 130 msglog("Warning: RIPv1 input via %s" 131 " will be accepted without authentication", 132 ifp->int_name); 133 warned_auth_in = 1; 134 } 135 if (!IS_RIP_OUT_OFF(ifp->int_state) 136 && ifp->int_auth[0].type != RIP_AUTH_NONE 137 && !(ifp->int_state & IS_NO_RIPV1_OUT)) { 138 if (!warned_auth_out) { 139 msglog("Warning: RIPv1 output via %s" 140 " will be sent without authentication", 141 ifp->int_name); 142 warned_auth_out = 1; 143 } 144 } 145 } 146 147 148 /* Read a list of gateways from /etc/gateways and add them to our tables. 149 * 150 * This file contains a list of "remote" gateways. That is usually 151 * a gateway which we cannot immediately determine if it is present or 152 * not as we can do for those provided by directly connected hardware. 153 * 154 * If a gateway is marked "passive" in the file, then we assume it 155 * does not understand RIP and assume it is always present. Those 156 * not marked passive are treated as if they were directly connected 157 * and assumed to be broken if they do not send us advertisements. 158 * All remote interfaces are added to our list, and those not marked 159 * passive are sent routing updates. 160 * 161 * A passive interface can also be local, hardware interface exempt 162 * from RIP. 163 */ 164 void 165 gwkludge(void) 166 { 167 FILE *fp; 168 char *p, *lptr; 169 const char *cp; 170 char lbuf[200], net_host[5], dname[64+1+64+1]; 171 char gname[GNAME_LEN+1], qual[9]; 172 struct interface *ifp; 173 naddr dst, netmask, gate; 174 int metric, n, lnum; 175 struct stat sb; 176 u_int state; 177 const char *type; 178 179 180 fp = fopen(_PATH_GATEWAYS, "r"); 181 if (fp == 0) 182 return; 183 184 if (0 > fstat(fileno(fp), &sb)) { 185 msglog("could not stat() "_PATH_GATEWAYS); 186 (void)fclose(fp); 187 return; 188 } 189 190 for (lnum = 1; ; lnum++) { 191 if (0 == fgets(lbuf, sizeof(lbuf), fp)) 192 break; 193 lptr = lbuf; 194 while (*lptr == ' ') 195 lptr++; 196 p = lptr+strlen(lptr)-1; 197 while (*p == '\n' 198 || (*p == ' ' && (p == lptr+1 || *(p-1) != '\\'))) 199 *p-- = '\0'; 200 if (*lptr == '\0' /* ignore null and comment lines */ 201 || *lptr == '#') 202 continue; 203 204 /* notice newfangled parameter lines 205 */ 206 if (strncasecmp("net", lptr, 3) 207 && strncasecmp("host", lptr, 4)) { 208 cp = parse_parms(lptr, 209 (sb.st_uid == 0 210 && !(sb.st_mode&(S_IRWXG|S_IRWXO)))); 211 if (cp != 0) 212 msglog("%s in line %d of "_PATH_GATEWAYS, 213 cp, lnum); 214 continue; 215 } 216 217 /* {net | host} XX[/M] XX gateway XX metric DD [passive | external]\n */ 218 qual[0] = '\0'; 219 /* the '64' here must be GNAME_LEN */ 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 if (dst == RIP_DEFAULT) { 247 msglog("bad net \"%s\" in "_PATH_GATEWAYS 248 " entry \"%s\"--cannot be default", 249 dname, lptr); 250 continue; 251 } 252 /* Turn network # into IP address. */ 253 dst = htonl(dst); 254 } else { 255 msglog("bad \"%s\" in "_PATH_GATEWAYS 256 " entry \"%s\"", net_host, lptr); 257 continue; 258 } 259 260 if (!gethost(gname, &gate)) { 261 msglog("bad gateway \"%s\" in "_PATH_GATEWAYS 262 " entry \"%s\"", gname, lptr); 263 continue; 264 } 265 266 if (!strcasecmp(qual, type = "passive")) { 267 /* Passive entries are not placed in our tables, 268 * only the kernel's, so we don't copy all of the 269 * external routing information within a net. 270 * Internal machines should use the default 271 * route to a suitable gateway (like us). 272 */ 273 state = IS_REMOTE | IS_PASSIVE; 274 if (metric == 0) 275 metric = 1; 276 277 } else if (!strcasecmp(qual, type = "external")) { 278 /* External entries are handled by other means 279 * such as EGP, and are placed only in the daemon 280 * tables to prevent overriding them with something 281 * else. 282 */ 283 strcpy(qual,"external"); 284 state = IS_REMOTE | IS_PASSIVE | IS_EXTERNAL; 285 if (metric == 0) 286 metric = 1; 287 288 } else if (!strcasecmp(qual, "active") 289 || qual[0] == '\0') { 290 if (metric != 0) { 291 /* Entries that are neither "passive" nor 292 * "external" are "remote" and must behave 293 * like physical interfaces. If they are not 294 * heard from regularly, they are deleted. 295 */ 296 state = IS_REMOTE; 297 type = "remote"; 298 } else { 299 /* "remote" entries with a metric of 0 300 * are aliases for our own interfaces 301 */ 302 state = IS_REMOTE | IS_PASSIVE | IS_ALIAS; 303 type = "alias"; 304 } 305 306 } else { 307 msglog("bad "_PATH_GATEWAYS" entry \"%s\";" 308 " unknown type %s", lptr, qual); 309 continue; 310 } 311 312 if (0 != (state & (IS_PASSIVE | IS_REMOTE))) 313 state |= IS_NO_RDISC; 314 if (state & IS_PASSIVE) 315 state |= IS_NO_RIP; 316 317 ifp = check_dup(gate,dst,netmask,state); 318 if (ifp != 0) { 319 msglog("duplicate "_PATH_GATEWAYS" entry \"%s\"",lptr); 320 continue; 321 } 322 323 ifp = (struct interface *)rtmalloc(sizeof(*ifp), "gwkludge()"); 324 memset(ifp, 0, sizeof(*ifp)); 325 326 ifp->int_state = state; 327 if (netmask == HOST_MASK) 328 ifp->int_if_flags = IFF_POINTOPOINT | IFF_UP; 329 else 330 ifp->int_if_flags = IFF_UP; 331 ifp->int_act_time = NEVER; 332 ifp->int_addr = gate; 333 ifp->int_dstaddr = dst; 334 ifp->int_mask = netmask; 335 ifp->int_ripv1_mask = netmask; 336 ifp->int_std_mask = std_mask(gate); 337 ifp->int_net = ntohl(dst); 338 ifp->int_std_net = ifp->int_net & ifp->int_std_mask; 339 ifp->int_std_addr = htonl(ifp->int_std_net); 340 ifp->int_metric = metric; 341 if (!(state & IS_EXTERNAL) 342 && ifp->int_mask != ifp->int_std_mask) 343 ifp->int_state |= IS_SUBNET; 344 (void)sprintf(ifp->int_name, "%s(%s)", type, gname); 345 ifp->int_index = -1; 346 347 if_link(ifp); 348 } 349 350 /* After all of the parameter lines have been read, 351 * apply them to any remote interfaces. 352 */ 353 LIST_FOREACH(ifp, &ifnet, int_list) { 354 get_parms(ifp); 355 356 tot_interfaces++; 357 if (!IS_RIP_OFF(ifp->int_state)) 358 rip_interfaces++; 359 360 trace_if("Add", ifp); 361 } 362 363 (void)fclose(fp); 364 } 365 366 367 /* like strtok(), but honoring backslash and not changing the source string 368 */ 369 static int /* 0=ok, -1=bad */ 370 parse_quote(char **linep, /* look here */ 371 const char *delims, /* for these delimiters */ 372 char *delimp, /* 0 or put found delimiter here */ 373 char *buf, /* copy token to here */ 374 int lim) /* at most this many bytes */ 375 { 376 char c = '\0', *pc; 377 const char *p; 378 379 380 pc = *linep; 381 if (*pc == '\0') 382 return -1; 383 384 while (lim != 0) { 385 c = *pc++; 386 if (c == '\0') 387 break; 388 389 if (c == '\\' && *pc != '\0') { 390 if ((c = *pc++) == 'n') { 391 c = '\n'; 392 } else if (c == 'r') { 393 c = '\r'; 394 } else if (c == 't') { 395 c = '\t'; 396 } else if (c == 'b') { 397 c = '\b'; 398 } else if (c >= '0' && c <= '7') { 399 c -= '0'; 400 if (*pc >= '0' && *pc <= '7') { 401 c = (c<<3)+(*pc++ - '0'); 402 if (*pc >= '0' && *pc <= '7') 403 c = (c<<3)+(*pc++ - '0'); 404 } 405 } 406 407 } else { 408 for (p = delims; *p != '\0'; ++p) { 409 if (*p == c) 410 goto exit; 411 } 412 } 413 414 *buf++ = c; 415 --lim; 416 } 417 exit: 418 if (lim == 0) 419 return -1; 420 421 *buf = '\0'; /* terminate copy of token */ 422 if (delimp != 0) 423 *delimp = c; /* return delimiter */ 424 *linep = pc-1; /* say where we ended */ 425 return 0; 426 } 427 428 429 /* Parse password timestamp 430 */ 431 static char * 432 parse_ts(time_t *tp, 433 char **valp, 434 char *val0, 435 char *delimp, 436 char *buf, 437 u_int bufsize) 438 { 439 struct tm tm; 440 char *ptr; 441 442 if (0 > parse_quote(valp, "| ,\n\r", delimp, 443 buf,bufsize) 444 || buf[bufsize-1] != '\0' 445 || buf[bufsize-2] != '\0') { 446 sprintf(buf,"bad timestamp %.25s", val0); 447 return buf; 448 } 449 strcat(buf,"\n"); 450 memset(&tm, 0, sizeof(tm)); 451 ptr = strptime(buf, "%y/%m/%d@%H:%M\n", &tm); 452 if (ptr == NULL || *ptr != '\0') { 453 sprintf(buf,"bad timestamp %.25s", val0); 454 return buf; 455 } 456 457 if ((*tp = mktime(&tm)) == -1) { 458 sprintf(buf,"bad timestamp %.25s", val0); 459 return buf; 460 } 461 462 return 0; 463 } 464 465 466 /* Get a password, key ID, and expiration date in the format 467 * passwd|keyID|year/mon/day@hour:min|year/mon/day@hour:min 468 */ 469 static const char * /* 0 or error message */ 470 get_passwd(char *tgt, 471 char *val, 472 struct parm *parmp, 473 u_int16_t type, 474 int safe) /* 1=from secure file */ 475 { 476 static char buf[80]; 477 char *val0, *p, delim; 478 struct auth k, *ap, *ap2; 479 int i; 480 u_long l; 481 482 assert(val != NULL); 483 if (!safe) 484 return "ignore unsafe password"; 485 486 for (ap = parmp->parm_auth, i = 0; 487 ap->type != RIP_AUTH_NONE; i++, ap++) { 488 if (i >= MAX_AUTH_KEYS) 489 return "too many passwords"; 490 } 491 492 memset(&k, 0, sizeof(k)); 493 k.type = type; 494 k.end = -1-DAY; 495 496 val0 = val; 497 if (0 > parse_quote(&val, "| ,\n\r", &delim, 498 (char *)k.key, sizeof(k.key))) 499 return tgt; 500 501 if (delim != '|') { 502 if (type == RIP_AUTH_MD5) 503 return "missing Keyid"; 504 } else { 505 val0 = ++val; 506 buf[sizeof(buf)-1] = '\0'; 507 if (0 > parse_quote(&val, "| ,\n\r", &delim, buf,sizeof(buf)) 508 || buf[sizeof(buf)-1] != '\0' 509 || (l = strtoul(buf,&p,0)) > 255 510 || *p != '\0') { 511 sprintf(buf,"bad KeyID \"%.20s\"", val0); 512 return buf; 513 } 514 for (ap2 = parmp->parm_auth; ap2 < ap; ap2++) { 515 if (ap2->keyid == l) { 516 sprintf(buf,"duplicate KeyID \"%.20s\"", val0); 517 return buf; 518 } 519 } 520 k.keyid = (int)l; 521 522 if (delim == '|') { 523 val0 = ++val; 524 if (0 != (p = parse_ts(&k.start,&val,val0,&delim, 525 buf,sizeof(buf)))) 526 return p; 527 if (delim != '|') 528 return "missing second timestamp"; 529 val0 = ++val; 530 if (0 != (p = parse_ts(&k.end,&val,val0,&delim, 531 buf,sizeof(buf)))) 532 return p; 533 if ((u_long)k.start > (u_long)k.end) { 534 sprintf(buf,"out of order timestamp %.30s", 535 val0); 536 return buf; 537 } 538 } 539 } 540 if (delim != '\0') 541 return tgt; 542 543 memmove(ap, &k, sizeof(*ap)); 544 return 0; 545 } 546 547 548 static const char * 549 bad_str(const char *estr) 550 { 551 static char buf[100+8]; 552 553 sprintf(buf, "bad \"%.100s\"", estr); 554 return buf; 555 } 556 557 558 /* Parse a set of parameters for an interface. 559 */ 560 const char * /* 0 or error message */ 561 parse_parms(char *line, 562 int safe) /* 1=from secure file */ 563 { 564 #define PARS(str) (!strcasecmp(tgt, str)) 565 #define PARSEQ(str) (!strncasecmp(tgt, str"=", sizeof(str))) 566 #define CKF(g,b) {if (0 != (parm.parm_int_state & ((g) & ~(b)))) break; \ 567 parm.parm_int_state |= (b);} 568 struct parm parm; 569 struct intnet *intnetp; 570 struct r1net *r1netp; 571 struct tgate *tg; 572 naddr addr, mask; 573 char delim, *val0 = 0, *tgt, *val, *p; 574 const char *msg; 575 char buf[BUFSIZ], buf2[BUFSIZ]; 576 int i; 577 578 579 /* "subnet=x.y.z.u/mask[,metric]" must be alone on the line */ 580 if (!strncasecmp(line, "subnet=", sizeof("subnet=")-1) 581 && *(val = &line[sizeof("subnet=")-1]) != '\0') { 582 if (0 > parse_quote(&val, ",", &delim, buf, sizeof(buf))) 583 return bad_str(line); 584 intnetp = (struct intnet*)rtmalloc(sizeof(*intnetp), 585 "parse_parms subnet"); 586 intnetp->intnet_metric = 1; 587 if (delim == ',') { 588 intnetp->intnet_metric = (int)strtol(val+1,&p,0); 589 if (*p != '\0' 590 || intnetp->intnet_metric <= 0 591 || intnetp->intnet_metric >= HOPCNT_INFINITY) 592 return bad_str(line); 593 } 594 if (!getnet(buf, &intnetp->intnet_addr, &intnetp->intnet_mask) 595 || intnetp->intnet_mask == HOST_MASK 596 || intnetp->intnet_addr == RIP_DEFAULT) { 597 free(intnetp); 598 return bad_str(line); 599 } 600 intnetp->intnet_addr = htonl(intnetp->intnet_addr); 601 intnetp->intnet_next = intnets; 602 intnets = intnetp; 603 return 0; 604 } 605 606 /* "ripv1_mask=x.y.z.u/mask1,mask2" must be alone on the line. 607 * This requires that x.y.z.u/mask1 be considered a subnet of 608 * x.y.z.u/mask2, as if x.y.z.u/mask2 were a class-full network. 609 */ 610 if (!strncasecmp(line, "ripv1_mask=", sizeof("ripv1_mask=")-1) 611 && *(val = &line[sizeof("ripv1_mask=")-1]) != '\0') { 612 if (0 > parse_quote(&val, ",", &delim, buf, sizeof(buf)) 613 || delim == '\0') 614 return bad_str(line); 615 if ((i = (int)strtol(val+1, &p, 0)) <= 0 616 || i > 32 || *p != '\0') 617 return bad_str(line); 618 r1netp = (struct r1net *)rtmalloc(sizeof(*r1netp), 619 "parse_parms ripv1_mask"); 620 r1netp->r1net_mask = HOST_MASK << (32-i); 621 if (!getnet(buf, &r1netp->r1net_net, &r1netp->r1net_match) 622 || r1netp->r1net_net == RIP_DEFAULT 623 || r1netp->r1net_mask > r1netp->r1net_match) { 624 free(r1netp); 625 return bad_str(line); 626 } 627 r1netp->r1net_next = r1nets; 628 r1nets = r1netp; 629 return 0; 630 } 631 632 memset(&parm, 0, sizeof(parm)); 633 634 for (;;) { 635 tgt = line + strspn(line, " ,\n\r"); 636 if (*tgt == '\0' || *tgt == '#') 637 break; 638 line = tgt+strcspn(tgt, "= #,\n\r"); 639 delim = *line; 640 if (delim == '=') { 641 val0 = ++line; 642 if (0 > parse_quote(&line, " #,\n\r",&delim, 643 buf,sizeof(buf))) 644 return bad_str(tgt); 645 } else { 646 val0 = NULL; 647 } 648 if (delim != '\0') { 649 for (;;) { 650 *line = '\0'; 651 if (delim == '#') 652 break; 653 ++line; 654 if (delim != ' ' 655 || (delim = *line) != ' ') 656 break; 657 } 658 } 659 660 if (PARSEQ("if")) { 661 if (parm.parm_name[0] != '\0' 662 || strlen(buf) > IF_NAME_LEN) 663 return bad_str(tgt); 664 strcpy(parm.parm_name, buf); 665 666 } else if (PARSEQ("addr")) { 667 /* This is a bad idea, because the address based 668 * sets of parameters cannot be checked for 669 * consistency with the interface name parameters. 670 * The parm_net stuff is needed to allow several 671 * -F settings. 672 */ 673 if (!getnet(val0, &addr, &mask) 674 || parm.parm_name[0] != '\0') 675 return bad_str(tgt); 676 parm.parm_net = addr; 677 parm.parm_mask = mask; 678 parm.parm_name[0] = '\n'; 679 680 } else if (PARSEQ("passwd")) { 681 /* since cleartext passwords are so weak allow 682 * them anywhere 683 */ 684 msg = get_passwd(tgt,val0,&parm,RIP_AUTH_PW,1); 685 if (msg) { 686 *val0 = '\0'; 687 return bad_str(msg); 688 } 689 690 } else if (PARSEQ("md5_passwd")) { 691 msg = get_passwd(tgt,val0,&parm,RIP_AUTH_MD5,safe); 692 if (msg) { 693 *val0 = '\0'; 694 return bad_str(msg); 695 } 696 697 } else if (PARS("no_ag")) { 698 parm.parm_int_state |= (IS_NO_AG | IS_NO_SUPER_AG); 699 700 } else if (PARS("no_super_ag")) { 701 parm.parm_int_state |= IS_NO_SUPER_AG; 702 703 } else if (PARS("no_rip_out")) { 704 parm.parm_int_state |= IS_NO_RIP_OUT; 705 706 } else if (PARS("no_ripv1_in")) { 707 parm.parm_int_state |= IS_NO_RIPV1_IN; 708 709 } else if (PARS("no_ripv2_in")) { 710 parm.parm_int_state |= IS_NO_RIPV2_IN; 711 712 } else if (PARS("ripv2_out")) { 713 if (parm.parm_int_state & IS_NO_RIPV2_OUT) 714 return bad_str(tgt); 715 parm.parm_int_state |= IS_NO_RIPV1_OUT; 716 717 } else if (PARS("ripv2")) { 718 if ((parm.parm_int_state & IS_NO_RIPV2_OUT) 719 || (parm.parm_int_state & IS_NO_RIPV2_IN)) 720 return bad_str(tgt); 721 parm.parm_int_state |= (IS_NO_RIPV1_IN 722 | IS_NO_RIPV1_OUT); 723 724 } else if (PARS("no_rip")) { 725 CKF(IS_PM_RDISC, IS_NO_RIP); 726 727 } else if (PARS("no_rip_mcast")) { 728 parm.parm_int_state |= IS_NO_RIP_MCAST; 729 730 } else if (PARS("no_rdisc")) { 731 CKF((GROUP_IS_SOL_OUT|GROUP_IS_ADV_OUT), IS_NO_RDISC); 732 733 } else if (PARS("no_solicit")) { 734 CKF(GROUP_IS_SOL_OUT, IS_NO_SOL_OUT); 735 736 } else if (PARS("send_solicit")) { 737 CKF(GROUP_IS_SOL_OUT, IS_SOL_OUT); 738 739 } else if (PARS("no_rdisc_adv")) { 740 CKF(GROUP_IS_ADV_OUT, IS_NO_ADV_OUT); 741 742 } else if (PARS("rdisc_adv")) { 743 CKF(GROUP_IS_ADV_OUT, IS_ADV_OUT); 744 745 } else if (PARS("bcast_rdisc")) { 746 parm.parm_int_state |= IS_BCAST_RDISC; 747 748 } else if (PARS("passive")) { 749 CKF((GROUP_IS_SOL_OUT|GROUP_IS_ADV_OUT), IS_NO_RDISC); 750 parm.parm_int_state |= IS_NO_RIP | IS_PASSIVE; 751 752 } else if (PARSEQ("rdisc_pref")) { 753 if (parm.parm_rdisc_pref != 0 754 || (parm.parm_rdisc_pref = (int)strtol(buf,&p,0), 755 *p != '\0')) 756 return bad_str(tgt); 757 758 } else if (PARS("pm_rdisc")) { 759 if (IS_RIP_OUT_OFF(parm.parm_int_state)) 760 return bad_str(tgt); 761 parm.parm_int_state |= IS_PM_RDISC; 762 763 } else if (PARSEQ("rdisc_interval")) { 764 if (parm.parm_rdisc_int != 0 765 || (parm.parm_rdisc_int = (int)strtoul(buf,&p,0), 766 *p != '\0') 767 || parm.parm_rdisc_int < MinMaxAdvertiseInterval 768 || parm.parm_rdisc_int > MaxMaxAdvertiseInterval) 769 return bad_str(tgt); 770 771 } else if (PARSEQ("fake_default")) { 772 if (parm.parm_d_metric != 0 773 || IS_RIP_OUT_OFF(parm.parm_int_state) 774 || (i = strtoul(buf,&p,0), *p != '\0') 775 || i > HOPCNT_INFINITY-1) 776 return bad_str(tgt); 777 parm.parm_d_metric = i; 778 779 } else if (PARSEQ("adj_inmetric")) { 780 if (parm.parm_adj_inmetric != 0 781 || (i = strtoul(buf,&p,0), *p != '\0') 782 || i > HOPCNT_INFINITY-1) 783 return bad_str(tgt); 784 parm.parm_adj_inmetric = i; 785 786 } else if (PARSEQ("adj_outmetric")) { 787 if (parm.parm_adj_outmetric != 0 788 || (i = strtoul(buf,&p,0), *p != '\0') 789 || i > HOPCNT_INFINITY-1) 790 return bad_str(tgt); 791 parm.parm_adj_outmetric = i; 792 793 } else if (PARSEQ("trust_gateway")) { 794 /* look for trust_gateway=x.y.z|net/mask|...) */ 795 p = buf; 796 if (0 > parse_quote(&p, "|", &delim, 797 buf2, sizeof(buf2)) 798 || !gethost(buf2,&addr)) 799 return bad_str(tgt); 800 tg = (struct tgate *)rtmalloc(sizeof(*tg), 801 "parse_parms" 802 "trust_gateway"); 803 memset(tg, 0, sizeof(*tg)); 804 tg->tgate_addr = addr; 805 i = 0; 806 /* The default is to trust all routes. */ 807 while (delim == '|') { 808 p++; 809 if (i >= MAX_TGATE_NETS 810 || 0 > parse_quote(&p, "|", &delim, 811 buf2, sizeof(buf2)) 812 || !getnet(buf2, &tg->tgate_nets[i].net, 813 &tg->tgate_nets[i].mask) 814 || tg->tgate_nets[i].net == RIP_DEFAULT 815 || tg->tgate_nets[i].mask == 0) 816 return bad_str(tgt); 817 i++; 818 } 819 tg->tgate_next = tgates; 820 tgates = tg; 821 parm.parm_int_state |= IS_DISTRUST; 822 823 } else if (PARS("redirect_ok")) { 824 parm.parm_int_state |= IS_REDIRECT_OK; 825 826 } else { 827 return bad_str(tgt); /* error */ 828 } 829 } 830 831 return check_parms(&parm); 832 #undef PARS 833 #undef PARSEQ 834 } 835 836 837 /* check for duplicate parameter specifications */ 838 const char * /* 0 or error message */ 839 check_parms(struct parm *new) 840 { 841 struct parm *parmp, **parmpp; 842 int i, num_passwds; 843 844 /* set implicit values 845 */ 846 if (new->parm_int_state & IS_NO_ADV_IN) 847 new->parm_int_state |= IS_NO_SOL_OUT; 848 if (new->parm_int_state & IS_NO_SOL_OUT) 849 new->parm_int_state |= IS_NO_ADV_IN; 850 851 for (i = num_passwds = 0; i < MAX_AUTH_KEYS; i++) { 852 if (new->parm_auth[i].type != RIP_AUTH_NONE) 853 num_passwds++; 854 } 855 856 /* compare with existing sets of parameters 857 */ 858 for (parmpp = &parms; 859 (parmp = *parmpp) != 0; 860 parmpp = &parmp->parm_next) { 861 if (strcmp(new->parm_name, parmp->parm_name)) 862 continue; 863 if (!on_net(htonl(parmp->parm_net), 864 new->parm_net, new->parm_mask) 865 && !on_net(htonl(new->parm_net), 866 parmp->parm_net, parmp->parm_mask)) 867 continue; 868 869 for (i = 0; i < MAX_AUTH_KEYS; i++) { 870 if (parmp->parm_auth[i].type != RIP_AUTH_NONE) 871 num_passwds++; 872 } 873 if (num_passwds > MAX_AUTH_KEYS) 874 return "too many conflicting passwords"; 875 876 if ((0 != (new->parm_int_state & GROUP_IS_SOL_OUT) 877 && 0 != (parmp->parm_int_state & GROUP_IS_SOL_OUT) 878 && 0 != ((new->parm_int_state ^ parmp->parm_int_state) 879 & GROUP_IS_SOL_OUT)) 880 || (0 != (new->parm_int_state & GROUP_IS_ADV_OUT) 881 && 0 != (parmp->parm_int_state & GROUP_IS_ADV_OUT) 882 && 0 != ((new->parm_int_state ^ parmp->parm_int_state) 883 & GROUP_IS_ADV_OUT)) 884 || (new->parm_rdisc_pref != 0 885 && parmp->parm_rdisc_pref != 0 886 && new->parm_rdisc_pref != parmp->parm_rdisc_pref) 887 || (new->parm_rdisc_int != 0 888 && parmp->parm_rdisc_int != 0 889 && new->parm_rdisc_int != parmp->parm_rdisc_int)) { 890 return ("conflicting, duplicate router discovery" 891 " parameters"); 892 893 } 894 895 if (new->parm_d_metric != 0 896 && parmp->parm_d_metric != 0 897 && new->parm_d_metric != parmp->parm_d_metric) { 898 return ("conflicting, duplicate poor man's router" 899 " discovery or fake default metric"); 900 } 901 902 if (new->parm_adj_inmetric != 0 903 && parmp->parm_adj_inmetric != 0 904 && new->parm_adj_inmetric != parmp->parm_adj_inmetric) { 905 return ("conflicting interface input " 906 "metric adjustments"); 907 } 908 909 if (new->parm_adj_outmetric != 0 910 && parmp->parm_adj_outmetric != 0 911 && new->parm_adj_outmetric != parmp->parm_adj_outmetric) { 912 return ("conflicting interface output " 913 "metric adjustments"); 914 } 915 } 916 917 /* link new entry on the list so that when the entries are scanned, 918 * they affect the result in the order the operator specified. 919 */ 920 parmp = (struct parm*)rtmalloc(sizeof(*parmp), "check_parms"); 921 memcpy(parmp, new, sizeof(*parmp)); 922 *parmpp = parmp; 923 924 return 0; 925 } 926 927 928 /* get a network number as a name or a number, with an optional "/xx" 929 * netmask. 930 */ 931 int /* 0=bad */ 932 getnet(char *name, 933 naddr *netp, /* network in host byte order */ 934 naddr *maskp) /* masks are always in host order */ 935 { 936 int i; 937 struct netent *np; 938 naddr mask; /* in host byte order */ 939 struct in_addr in; /* a network and so host byte order */ 940 char hname[MAXHOSTNAMELEN+1]; 941 char *mname, *p; 942 943 944 /* Detect and separate "1.2.3.4/24" 945 */ 946 if (0 != (mname = strrchr(name,'/'))) { 947 i = (int)(mname - name); 948 if (i > (int)sizeof(hname)-1) /* name too long */ 949 return 0; 950 memmove(hname, name, i); 951 hname[i] = '\0'; 952 mname++; 953 name = hname; 954 } 955 956 np = getnetbyname(name); 957 if (np != 0) { 958 in.s_addr = (naddr)np->n_net; 959 if (0 == (in.s_addr & 0xff000000)) 960 in.s_addr <<= 8; 961 if (0 == (in.s_addr & 0xff000000)) 962 in.s_addr <<= 8; 963 if (0 == (in.s_addr & 0xff000000)) 964 in.s_addr <<= 8; 965 } else if (inet_aton(name, &in) == 1) { 966 in.s_addr = ntohl(in.s_addr); 967 } else if (!mname && !strcasecmp(name,"default")) { 968 in.s_addr = RIP_DEFAULT; 969 } else { 970 return 0; 971 } 972 973 if (!mname) { 974 /* we cannot use the interfaces here because we have not 975 * looked at them yet. 976 */ 977 mask = std_mask(htonl(in.s_addr)); 978 if ((~mask & in.s_addr) != 0) 979 mask = HOST_MASK; 980 } else { 981 mask = (naddr)strtoul(mname, &p, 0); 982 if (*p != '\0' || mask > 32) 983 return 0; 984 if (mask != 0) 985 mask = HOST_MASK << (32-mask); 986 } 987 988 /* must have mask of 0 with default */ 989 if (mask != 0 && in.s_addr == RIP_DEFAULT) 990 return 0; 991 /* no host bits allowed in a network number */ 992 if ((~mask & in.s_addr) != 0) 993 return 0; 994 /* require non-zero network number */ 995 if ((mask & in.s_addr) == 0 && in.s_addr != RIP_DEFAULT) 996 return 0; 997 if (in.s_addr>>24 == 0 && in.s_addr != RIP_DEFAULT) 998 return 0; 999 if (in.s_addr>>24 == 0xff) 1000 return 0; 1001 1002 *netp = in.s_addr; 1003 *maskp = mask; 1004 return 1; 1005 } 1006 1007 1008 int /* 0=bad */ 1009 gethost(char *name, 1010 naddr *addrp) 1011 { 1012 struct hostent *hp; 1013 struct in_addr in; 1014 1015 1016 /* Try for a number first, even in IRIX where gethostbyname() 1017 * is smart. This avoids hitting the name server which 1018 * might be sick because routing is. 1019 */ 1020 if (inet_aton(name, &in) == 1) { 1021 /* get a good number, but check that it it makes some 1022 * sense. 1023 */ 1024 if (ntohl(in.s_addr)>>24 == 0 1025 || ntohl(in.s_addr)>>24 == 0xff) 1026 return 0; 1027 *addrp = in.s_addr; 1028 return 1; 1029 } 1030 1031 hp = gethostbyname(name); 1032 if (hp) { 1033 memcpy(addrp, hp->h_addr, sizeof(*addrp)); 1034 return 1; 1035 } 1036 1037 return 0; 1038 } 1039