parms.c revision 1.14
1 /* $NetBSD: parms.c,v 1.14 2000/07/21 00:22:38 thorpej 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 acknowledgment: 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[] __attribute__((unused)) = "@(#)if.c 8.1 (Berkeley) 6/5/93"; 38 #elif defined(__NetBSD__) 39 #include <sys/cdefs.h> 40 __RCSID("$NetBSD: parms.c,v 1.14 2000/07/21 00:22:38 thorpej 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 r1net *r1nets; 51 struct tgate *tgates; 52 53 54 /* use configured parameters 55 */ 56 void 57 get_parms(struct interface *ifp) 58 { 59 static int warned_auth_in, warned_auth_out; 60 struct parm *parmp; 61 int i, num_passwds = 0; 62 63 /* get all relevant parameters 64 */ 65 for (parmp = parms; parmp != 0; parmp = parmp->parm_next) { 66 if (parmp->parm_name[0] == '\0' 67 || !strcmp(ifp->int_name, parmp->parm_name) 68 || (parmp->parm_name[0] == '\n' 69 && on_net(ifp->int_addr, 70 parmp->parm_net, parmp->parm_mask))) { 71 72 /* This group of parameters is relevant, 73 * so get its settings 74 */ 75 ifp->int_state |= parmp->parm_int_state; 76 for (i = 0; i < MAX_AUTH_KEYS; i++) { 77 if (parmp->parm_auth[0].type == RIP_AUTH_NONE 78 || num_passwds >= MAX_AUTH_KEYS) 79 break; 80 memcpy(&ifp->int_auth[num_passwds++], 81 &parmp->parm_auth[i], 82 sizeof(ifp->int_auth[0])); 83 } 84 if (parmp->parm_rdisc_pref != 0) 85 ifp->int_rdisc_pref = parmp->parm_rdisc_pref; 86 if (parmp->parm_rdisc_int != 0) 87 ifp->int_rdisc_int = parmp->parm_rdisc_int; 88 if (parmp->parm_d_metric != 0) 89 ifp->int_d_metric = parmp->parm_d_metric; 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 HTONL(dst); /* make network # into IP address */ 253 } else { 254 msglog("bad \"%s\" in "_PATH_GATEWAYS 255 " entry \"%s\"", net_host, lptr); 256 continue; 257 } 258 259 if (!gethost(gname, &gate)) { 260 msglog("bad gateway \"%s\" in "_PATH_GATEWAYS 261 " entry \"%s\"", gname, lptr); 262 continue; 263 } 264 265 if (!strcasecmp(qual, type = "passive")) { 266 /* Passive entries are not placed in our tables, 267 * only the kernel's, so we don't copy all of the 268 * external routing information within a net. 269 * Internal machines should use the default 270 * route to a suitable gateway (like us). 271 */ 272 state = IS_REMOTE | IS_PASSIVE; 273 if (metric == 0) 274 metric = 1; 275 276 } else if (!strcasecmp(qual, type = "external")) { 277 /* External entries are handled by other means 278 * such as EGP, and are placed only in the daemon 279 * tables to prevent overriding them with something 280 * else. 281 */ 282 strcpy(qual,"external"); 283 state = IS_REMOTE | IS_PASSIVE | IS_EXTERNAL; 284 if (metric == 0) 285 metric = 1; 286 287 } else if (!strcasecmp(qual, "active") 288 || qual[0] == '\0') { 289 if (metric != 0) { 290 /* Entries that are neither "passive" nor 291 * "external" are "remote" and must behave 292 * like physical interfaces. If they are not 293 * heard from regularly, they are deleted. 294 */ 295 state = IS_REMOTE; 296 type = "remote"; 297 } else { 298 /* "remote" entries with a metric of 0 299 * are aliases for our own interfaces 300 */ 301 state = IS_REMOTE | IS_PASSIVE | IS_ALIAS; 302 type = "alias"; 303 } 304 305 } else { 306 msglog("bad "_PATH_GATEWAYS" entry \"%s\";" 307 " unknown type %s", lptr, qual); 308 continue; 309 } 310 311 if (0 != (state & (IS_PASSIVE | IS_REMOTE))) 312 state |= IS_NO_RDISC; 313 if (state & IS_PASSIVE) 314 state |= IS_NO_RIP; 315 316 ifp = check_dup(gate,dst,netmask,0); 317 if (ifp != 0) { 318 msglog("duplicate "_PATH_GATEWAYS" entry \"%s\"",lptr); 319 continue; 320 } 321 322 ifp = (struct interface *)rtmalloc(sizeof(*ifp), "gwkludge()"); 323 memset(ifp, 0, sizeof(*ifp)); 324 325 ifp->int_state = state; 326 if (netmask == HOST_MASK) 327 ifp->int_if_flags = IFF_POINTOPOINT | IFF_UP; 328 else 329 ifp->int_if_flags = IFF_UP; 330 ifp->int_act_time = NEVER; 331 ifp->int_addr = gate; 332 ifp->int_dstaddr = dst; 333 ifp->int_mask = netmask; 334 ifp->int_ripv1_mask = netmask; 335 ifp->int_std_mask = std_mask(gate); 336 ifp->int_net = ntohl(dst); 337 ifp->int_std_net = ifp->int_net & ifp->int_std_mask; 338 ifp->int_std_addr = htonl(ifp->int_std_net); 339 ifp->int_metric = metric; 340 if (!(state & IS_EXTERNAL) 341 && ifp->int_mask != ifp->int_std_mask) 342 ifp->int_state |= IS_SUBNET; 343 (void)sprintf(ifp->int_name, "%s(%s)", type, gname); 344 ifp->int_index = -1; 345 346 if_link(ifp); 347 } 348 349 /* After all of the parameter lines have been read, 350 * apply them to any remote interfaces. 351 */ 352 for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next) { 353 get_parms(ifp); 354 355 tot_interfaces++; 356 if (!IS_RIP_OFF(ifp->int_state)) 357 rip_interfaces++; 358 359 trace_if("Add", ifp); 360 } 361 362 (void)fclose(fp); 363 } 364 365 366 /* like strtok(), but honoring backslash and not changing the source string 367 */ 368 static int /* 0=ok, -1=bad */ 369 parse_quote(char **linep, /* look here */ 370 const char *delims, /* for these delimiters */ 371 char *delimp, /* 0 or put found delimiter here */ 372 char *buf, /* copy token to here */ 373 int lim) /* at most this many bytes */ 374 { 375 char c = '\0', *pc; 376 const char *p; 377 378 379 pc = *linep; 380 if (*pc == '\0') 381 return -1; 382 383 while (lim != 0) { 384 c = *pc++; 385 if (c == '\0') 386 break; 387 388 if (c == '\\' && *pc != '\0') { 389 if ((c = *pc++) == 'n') { 390 c = '\n'; 391 } else if (c == 'r') { 392 c = '\r'; 393 } else if (c == 't') { 394 c = '\t'; 395 } else if (c == 'b') { 396 c = '\b'; 397 } else if (c >= '0' && c <= '7') { 398 c -= '0'; 399 if (*pc >= '0' && *pc <= '7') { 400 c = (c<<3)+(*pc++ - '0'); 401 if (*pc >= '0' && *pc <= '7') 402 c = (c<<3)+(*pc++ - '0'); 403 } 404 } 405 406 } else { 407 for (p = delims; *p != '\0'; ++p) { 408 if (*p == c) 409 goto exit; 410 } 411 } 412 413 *buf++ = c; 414 --lim; 415 } 416 exit: 417 if (lim == 0) 418 return -1; 419 420 *buf = '\0'; /* terminate copy of token */ 421 if (delimp != 0) 422 *delimp = c; /* return delimiter */ 423 *linep = pc-1; /* say where we ended */ 424 return 0; 425 } 426 427 428 /* Parse password timestamp 429 */ 430 static char * 431 parse_ts(time_t *tp, 432 char **valp, 433 char *val0, 434 char *delimp, 435 char *buf, 436 u_int bufsize) 437 { 438 struct tm tm; 439 #if defined(sgi) || defined(__NetBSD__) 440 char *ptr; 441 #endif 442 443 if (0 > parse_quote(valp, "| ,\n\r", delimp, 444 buf,bufsize) 445 || buf[bufsize-1] != '\0' 446 || buf[bufsize-2] != '\0') { 447 sprintf(buf,"bad timestamp %.25s", val0); 448 return buf; 449 } 450 strcat(buf,"\n"); 451 memset(&tm, 0, sizeof(tm)); 452 #if defined(sgi) || defined(__NetBSD__) 453 ptr = strptime(buf, "%y/%m/%d@%H:%M\n", &tm); 454 if (ptr == NULL || *ptr != '\0') { 455 sprintf(buf,"bad timestamp %.25s", val0); 456 return buf; 457 } 458 #else 459 if (5 != sscanf(buf, "%u/%u/%u@%u:%u\n", 460 &tm.tm_year, &tm.tm_mon, &tm.tm_mday, 461 &tm.tm_hour, &tm.tm_min) 462 || tm.tm_mon < 1 || tm.tm_mon > 12 463 || tm.tm_mday < 1 || tm.tm_mday > 31) { 464 sprintf(buf,"bad timestamp %.25s", val0); 465 return buf; 466 } 467 tm.tm_mon--; 468 if (tm.tm_year <= 37) /* assume small years are in the */ 469 tm.tm_year += 100; /* 3rd millenium */ 470 #endif 471 472 if ((*tp = mktime(&tm)) == -1) { 473 sprintf(buf,"bad timestamp %.25s", val0); 474 return buf; 475 } 476 477 return 0; 478 } 479 480 481 /* Get a password, key ID, and expiration date in the format 482 * passwd|keyID|year/mon/day@hour:min|year/mon/day@hour:min 483 */ 484 static const char * /* 0 or error message */ 485 get_passwd(char *tgt, 486 char *val, 487 struct parm *parmp, 488 u_int16_t type, 489 int safe) /* 1=from secure file */ 490 { 491 static char buf[80]; 492 char *val0, *p, delim; 493 struct auth k, *ap, *ap2; 494 int i; 495 u_long l; 496 497 498 if (!safe) 499 return "ignore unsafe password"; 500 501 for (ap = parmp->parm_auth, i = 0; 502 ap->type != RIP_AUTH_NONE; i++, ap++) { 503 if (i >= MAX_AUTH_KEYS) 504 return "too many passwords"; 505 } 506 507 memset(&k, 0, sizeof(k)); 508 k.type = type; 509 k.end = -1-DAY; 510 511 val0 = val; 512 if (0 > parse_quote(&val, "| ,\n\r", &delim, 513 (char *)k.key, sizeof(k.key))) 514 return tgt; 515 516 if (delim != '|') { 517 if (type == RIP_AUTH_MD5) 518 return "missing Keyid"; 519 } else { 520 val0 = ++val; 521 buf[sizeof(buf)-1] = '\0'; 522 if (0 > parse_quote(&val, "| ,\n\r", &delim, buf,sizeof(buf)) 523 || buf[sizeof(buf)-1] != '\0' 524 || (l = strtoul(buf,&p,0)) > 255 525 || *p != '\0') { 526 sprintf(buf,"bad KeyID \"%.20s\"", val0); 527 return buf; 528 } 529 for (ap2 = parmp->parm_auth; ap2 < ap; ap2++) { 530 if (ap2->keyid == l) { 531 sprintf(buf,"duplicate KeyID \"%.20s\"", val0); 532 return buf; 533 } 534 } 535 k.keyid = (int)l; 536 537 if (delim == '|') { 538 val0 = ++val; 539 if (0 != (p = parse_ts(&k.start,&val,val0,&delim, 540 buf,sizeof(buf)))) 541 return p; 542 if (delim != '|') 543 return "missing second timestamp"; 544 val0 = ++val; 545 if (0 != (p = parse_ts(&k.end,&val,val0,&delim, 546 buf,sizeof(buf)))) 547 return p; 548 if ((u_long)k.start > (u_long)k.end) { 549 sprintf(buf,"out of order timestamp %.30s", 550 val0); 551 return buf; 552 } 553 } 554 } 555 if (delim != '\0') 556 return tgt; 557 558 memmove(ap, &k, sizeof(*ap)); 559 return 0; 560 } 561 562 563 static const char * 564 bad_str(const char *estr) 565 { 566 static char buf[100+8]; 567 568 sprintf(buf, "bad \"%.100s\"", estr); 569 return buf; 570 } 571 572 573 /* Parse a set of parameters for an interface. 574 */ 575 const char * /* 0 or error message */ 576 parse_parms(char *line, 577 int safe) /* 1=from secure file */ 578 { 579 #define PARS(str) (!strcasecmp(tgt, str)) 580 #define PARSEQ(str) (!strncasecmp(tgt, str"=", sizeof(str))) 581 #define CKF(g,b) {if (0 != (parm.parm_int_state & ((g) & ~(b)))) break; \ 582 parm.parm_int_state |= (b);} 583 struct parm parm; 584 struct intnet *intnetp; 585 struct r1net *r1netp; 586 struct tgate *tg; 587 naddr addr, mask; 588 char delim, *val0 = 0, *tgt, *val, *p; 589 const char *msg; 590 char buf[BUFSIZ], buf2[BUFSIZ]; 591 int i; 592 593 594 /* "subnet=x.y.z.u/mask[,metric]" must be alone on the line */ 595 if (!strncasecmp(line, "subnet=", sizeof("subnet=")-1) 596 && *(val = &line[sizeof("subnet=")-1]) != '\0') { 597 if (0 > parse_quote(&val, ",", &delim, buf, sizeof(buf))) 598 return bad_str(line); 599 intnetp = (struct intnet*)rtmalloc(sizeof(*intnetp), 600 "parse_parms subnet"); 601 intnetp->intnet_metric = 1; 602 if (delim == ',') { 603 intnetp->intnet_metric = (int)strtol(val+1,&p,0); 604 if (*p != '\0' 605 || intnetp->intnet_metric <= 0 606 || intnetp->intnet_metric >= HOPCNT_INFINITY) 607 return bad_str(line); 608 } 609 if (!getnet(buf, &intnetp->intnet_addr, &intnetp->intnet_mask) 610 || intnetp->intnet_mask == HOST_MASK 611 || intnetp->intnet_addr == RIP_DEFAULT) { 612 free(intnetp); 613 return bad_str(line); 614 } 615 HTONL(intnetp->intnet_addr); 616 intnetp->intnet_next = intnets; 617 intnets = intnetp; 618 return 0; 619 } 620 621 /* "ripv1_mask=x.y.z.u/mask1,mask2" must be alone on the line. 622 * This requires that x.y.z.u/mask1 be considered a subnet of 623 * x.y.z.u/mask2, as if x.y.z.u/mask2 were a class-full network. 624 */ 625 if (!strncasecmp(line, "ripv1_mask=", sizeof("ripv1_mask=")-1) 626 && *(val = &line[sizeof("ripv1_mask=")-1]) != '\0') { 627 if (0 > parse_quote(&val, ",", &delim, buf, sizeof(buf)) 628 || delim == '\0') 629 return bad_str(line); 630 if ((i = (int)strtol(val+1, &p, 0)) <= 0 631 || i > 32 || *p != '\0') 632 return bad_str(line); 633 r1netp = (struct r1net *)rtmalloc(sizeof(*r1netp), 634 "parse_parms ripv1_mask"); 635 r1netp->r1net_mask = HOST_MASK << (32-i); 636 if (!getnet(buf, &r1netp->r1net_net, &r1netp->r1net_match) 637 || r1netp->r1net_net == RIP_DEFAULT 638 || r1netp->r1net_mask > r1netp->r1net_match) { 639 free(r1netp); 640 return bad_str(line); 641 } 642 r1netp->r1net_next = r1nets; 643 r1nets = r1netp; 644 return 0; 645 } 646 647 memset(&parm, 0, sizeof(parm)); 648 649 for (;;) { 650 tgt = line + strspn(line, " ,\n\r"); 651 if (*tgt == '\0' || *tgt == '#') 652 break; 653 line = tgt+strcspn(tgt, "= #,\n\r"); 654 delim = *line; 655 if (delim == '=') { 656 val0 = ++line; 657 if (0 > parse_quote(&line, " #,\n\r",&delim, 658 buf,sizeof(buf))) 659 return bad_str(tgt); 660 } 661 if (delim != '\0') { 662 for (;;) { 663 *line = '\0'; 664 if (delim == '#') 665 break; 666 ++line; 667 if (delim != ' ' 668 || (delim = *line) != ' ') 669 break; 670 } 671 } 672 673 if (PARSEQ("if")) { 674 if (parm.parm_name[0] != '\0' 675 || strlen(buf) > IF_NAME_LEN) 676 return bad_str(tgt); 677 strcpy(parm.parm_name, buf); 678 679 } else if (PARSEQ("addr")) { 680 /* This is a bad idea, because the address based 681 * sets of parameters cannot be checked for 682 * consistency with the interface name parameters. 683 * The parm_net stuff is needed to allow several 684 * -F settings. 685 */ 686 if (!getnet(val0, &addr, &mask) 687 || parm.parm_name[0] != '\0') 688 return bad_str(tgt); 689 parm.parm_net = addr; 690 parm.parm_mask = mask; 691 parm.parm_name[0] = '\n'; 692 693 } else if (PARSEQ("passwd")) { 694 /* since cleartext passwords are so weak allow 695 * them anywhere 696 */ 697 msg = get_passwd(tgt,val0,&parm,RIP_AUTH_PW,1); 698 if (msg) { 699 *val0 = '\0'; 700 return bad_str(msg); 701 } 702 703 } else if (PARSEQ("md5_passwd")) { 704 msg = get_passwd(tgt,val0,&parm,RIP_AUTH_MD5,safe); 705 if (msg) { 706 *val0 = '\0'; 707 return bad_str(msg); 708 } 709 710 } else if (PARS("no_ag")) { 711 parm.parm_int_state |= (IS_NO_AG | IS_NO_SUPER_AG); 712 713 } else if (PARS("no_super_ag")) { 714 parm.parm_int_state |= IS_NO_SUPER_AG; 715 716 } else if (PARS("no_ripv1_in")) { 717 parm.parm_int_state |= IS_NO_RIPV1_IN; 718 719 } else if (PARS("no_ripv2_in")) { 720 parm.parm_int_state |= IS_NO_RIPV2_IN; 721 722 } else if (PARS("ripv2_out")) { 723 if (parm.parm_int_state & IS_NO_RIPV2_OUT) 724 return bad_str(tgt); 725 parm.parm_int_state |= IS_NO_RIPV1_OUT; 726 727 } else if (PARS("ripv2")) { 728 if ((parm.parm_int_state & IS_NO_RIPV2_OUT) 729 || (parm.parm_int_state & IS_NO_RIPV2_IN)) 730 return bad_str(tgt); 731 parm.parm_int_state |= (IS_NO_RIPV1_IN 732 | IS_NO_RIPV1_OUT); 733 734 } else if (PARS("no_rip")) { 735 CKF(IS_PM_RDISC, IS_NO_RIP); 736 737 } else if (PARS("no_rip_mcast")) { 738 parm.parm_int_state |= IS_NO_RIP_MCAST; 739 740 } else if (PARS("no_rdisc")) { 741 CKF((GROUP_IS_SOL_OUT|GROUP_IS_ADV_OUT), IS_NO_RDISC); 742 743 } else if (PARS("no_solicit")) { 744 CKF(GROUP_IS_SOL_OUT, IS_NO_SOL_OUT); 745 746 } else if (PARS("send_solicit")) { 747 CKF(GROUP_IS_SOL_OUT, IS_SOL_OUT); 748 749 } else if (PARS("no_rdisc_adv")) { 750 CKF(GROUP_IS_ADV_OUT, IS_NO_ADV_OUT); 751 752 } else if (PARS("rdisc_adv")) { 753 CKF(GROUP_IS_ADV_OUT, IS_ADV_OUT); 754 755 } else if (PARS("bcast_rdisc")) { 756 parm.parm_int_state |= IS_BCAST_RDISC; 757 758 } else if (PARS("passive")) { 759 CKF((GROUP_IS_SOL_OUT|GROUP_IS_ADV_OUT), IS_NO_RDISC); 760 parm.parm_int_state |= IS_NO_RIP | IS_PASSIVE; 761 762 } else if (PARSEQ("rdisc_pref")) { 763 if (parm.parm_rdisc_pref != 0 764 || (parm.parm_rdisc_pref = (int)strtol(buf,&p,0), 765 *p != '\0')) 766 return bad_str(tgt); 767 768 } else if (PARS("pm_rdisc")) { 769 if (IS_RIP_OUT_OFF(parm.parm_int_state)) 770 return bad_str(tgt); 771 parm.parm_int_state |= IS_PM_RDISC; 772 773 } else if (PARSEQ("rdisc_interval")) { 774 if (parm.parm_rdisc_int != 0 775 || (parm.parm_rdisc_int = (int)strtoul(buf,&p,0), 776 *p != '\0') 777 || parm.parm_rdisc_int < MinMaxAdvertiseInterval 778 || parm.parm_rdisc_int > MaxMaxAdvertiseInterval) 779 return bad_str(tgt); 780 781 } else if (PARSEQ("fake_default")) { 782 if (parm.parm_d_metric != 0 783 || IS_RIP_OUT_OFF(parm.parm_int_state) 784 || (parm.parm_d_metric = (int)strtoul(buf,&p,0), 785 *p != '\0') 786 || parm.parm_d_metric > HOPCNT_INFINITY-1) 787 return bad_str(tgt); 788 789 } else if (PARSEQ("trust_gateway")) { 790 /* look for trust_gateway=x.y.z|net/mask|...) */ 791 p = buf; 792 if (0 > parse_quote(&p, "|", &delim, 793 buf2, sizeof(buf2)) 794 || !gethost(buf2,&addr)) 795 return bad_str(tgt); 796 tg = (struct tgate *)rtmalloc(sizeof(*tg), 797 "parse_parms" 798 "trust_gateway"); 799 memset(tg, 0, sizeof(*tg)); 800 tg->tgate_addr = addr; 801 i = 0; 802 /* The default is to trust all routes. */ 803 while (delim == '|') { 804 p++; 805 if (i >= MAX_TGATE_NETS 806 || 0 > parse_quote(&p, "|", &delim, 807 buf2, sizeof(buf2)) 808 || !getnet(buf2, &tg->tgate_nets[i].net, 809 &tg->tgate_nets[i].mask) 810 || tg->tgate_nets[i].net == RIP_DEFAULT 811 || tg->tgate_nets[i].mask == 0) 812 return bad_str(tgt); 813 i++; 814 } 815 tg->tgate_next = tgates; 816 tgates = tg; 817 parm.parm_int_state |= IS_DISTRUST; 818 819 } else if (PARS("redirect_ok")) { 820 parm.parm_int_state |= IS_REDIRECT_OK; 821 822 } else { 823 return bad_str(tgt); /* error */ 824 } 825 } 826 827 return check_parms(&parm); 828 #undef PARS 829 #undef PARSEQ 830 } 831 832 833 /* check for duplicate parameter specifications */ 834 const char * /* 0 or error message */ 835 check_parms(struct parm *new) 836 { 837 struct parm *parmp, **parmpp; 838 int i, num_passwds; 839 840 /* set implicit values 841 */ 842 if (new->parm_int_state & IS_NO_ADV_IN) 843 new->parm_int_state |= IS_NO_SOL_OUT; 844 if (new->parm_int_state & IS_NO_SOL_OUT) 845 new->parm_int_state |= IS_NO_ADV_IN; 846 847 for (i = num_passwds = 0; i < MAX_AUTH_KEYS; i++) { 848 if (new->parm_auth[i].type != RIP_AUTH_NONE) 849 num_passwds++; 850 } 851 852 /* compare with existing sets of parameters 853 */ 854 for (parmpp = &parms; 855 (parmp = *parmpp) != 0; 856 parmpp = &parmp->parm_next) { 857 if (strcmp(new->parm_name, parmp->parm_name)) 858 continue; 859 if (!on_net(htonl(parmp->parm_net), 860 new->parm_net, new->parm_mask) 861 && !on_net(htonl(new->parm_net), 862 parmp->parm_net, parmp->parm_mask)) 863 continue; 864 865 for (i = 0; i < MAX_AUTH_KEYS; i++) { 866 if (parmp->parm_auth[i].type != RIP_AUTH_NONE) 867 num_passwds++; 868 } 869 if (num_passwds > MAX_AUTH_KEYS) 870 return "too many conflicting passwords"; 871 872 if ((0 != (new->parm_int_state & GROUP_IS_SOL_OUT) 873 && 0 != (parmp->parm_int_state & GROUP_IS_SOL_OUT) 874 && 0 != ((new->parm_int_state ^ parmp->parm_int_state) 875 && GROUP_IS_SOL_OUT)) 876 || (0 != (new->parm_int_state & GROUP_IS_ADV_OUT) 877 && 0 != (parmp->parm_int_state & GROUP_IS_ADV_OUT) 878 && 0 != ((new->parm_int_state ^ parmp->parm_int_state) 879 && GROUP_IS_ADV_OUT)) 880 || (new->parm_rdisc_pref != 0 881 && parmp->parm_rdisc_pref != 0 882 && new->parm_rdisc_pref != parmp->parm_rdisc_pref) 883 || (new->parm_rdisc_int != 0 884 && parmp->parm_rdisc_int != 0 885 && new->parm_rdisc_int != parmp->parm_rdisc_int)) { 886 return ("conflicting, duplicate router discovery" 887 " parameters"); 888 889 } 890 891 if (new->parm_d_metric != 0 892 && parmp->parm_d_metric != 0 893 && new->parm_d_metric != parmp->parm_d_metric) { 894 return ("conflicting, duplicate poor man's router" 895 " discovery or fake default metric"); 896 } 897 } 898 899 /* link new entry on the so that when the entries are scanned, 900 * they affect the result in the order the operator specified. 901 */ 902 parmp = (struct parm*)rtmalloc(sizeof(*parmp), "check_parms"); 903 memcpy(parmp, new, sizeof(*parmp)); 904 *parmpp = parmp; 905 906 return 0; 907 } 908 909 910 /* get a network number as a name or a number, with an optional "/xx" 911 * netmask. 912 */ 913 int /* 0=bad */ 914 getnet(char *name, 915 naddr *netp, /* network in host byte order */ 916 naddr *maskp) /* masks are always in host order */ 917 { 918 int i; 919 struct netent *np; 920 naddr mask; /* in host byte order */ 921 struct in_addr in; /* a network and so host byte order */ 922 char hname[MAXHOSTNAMELEN+1]; 923 char *mname, *p; 924 925 926 /* Detect and separate "1.2.3.4/24" 927 */ 928 if (0 != (mname = strrchr(name,'/'))) { 929 i = (int)(mname - name); 930 if (i > (int)sizeof(hname)-1) /* name too long */ 931 return 0; 932 memmove(hname, name, i); 933 hname[i] = '\0'; 934 mname++; 935 name = hname; 936 } 937 938 np = getnetbyname(name); 939 if (np != 0) { 940 in.s_addr = (naddr)np->n_net; 941 if (0 == (in.s_addr & 0xff000000)) 942 in.s_addr <<= 8; 943 if (0 == (in.s_addr & 0xff000000)) 944 in.s_addr <<= 8; 945 if (0 == (in.s_addr & 0xff000000)) 946 in.s_addr <<= 8; 947 } else if (inet_aton(name, &in) == 1) { 948 NTOHL(in.s_addr); 949 } else if (!mname && !strcasecmp(name,"default")) { 950 in.s_addr = RIP_DEFAULT; 951 } else { 952 return 0; 953 } 954 955 if (!mname) { 956 /* we cannot use the interfaces here because we have not 957 * looked at them yet. 958 */ 959 mask = std_mask(htonl(in.s_addr)); 960 if ((~mask & in.s_addr) != 0) 961 mask = HOST_MASK; 962 } else { 963 mask = (naddr)strtoul(mname, &p, 0); 964 if (*p != '\0' || mask > 32) 965 return 0; 966 if (mask != 0) 967 mask = HOST_MASK << (32-mask); 968 } 969 970 /* must have mask of 0 with default */ 971 if (mask != 0 && in.s_addr == RIP_DEFAULT) 972 return 0; 973 /* no host bits allowed in a network number */ 974 if ((~mask & in.s_addr) != 0) 975 return 0; 976 /* require non-zero network number */ 977 if ((mask & in.s_addr) == 0 && in.s_addr != RIP_DEFAULT) 978 return 0; 979 if (in.s_addr>>24 == 0 && in.s_addr != RIP_DEFAULT) 980 return 0; 981 if (in.s_addr>>24 == 0xff) 982 return 0; 983 984 *netp = in.s_addr; 985 *maskp = mask; 986 return 1; 987 } 988 989 990 int /* 0=bad */ 991 gethost(char *name, 992 naddr *addrp) 993 { 994 struct hostent *hp; 995 struct in_addr in; 996 997 998 /* Try for a number first, even in IRIX where gethostbyname() 999 * is smart. This avoids hitting the name server which 1000 * might be sick because routing is. 1001 */ 1002 if (inet_aton(name, &in) == 1) { 1003 /* get a good number, but check that it it makes some 1004 * sense. 1005 */ 1006 if (ntohl(in.s_addr)>>24 == 0 1007 || ntohl(in.s_addr)>>24 == 0xff) 1008 return 0; 1009 *addrp = in.s_addr; 1010 return 1; 1011 } 1012 1013 hp = gethostbyname(name); 1014 if (hp) { 1015 memcpy(addrp, hp->h_addr, sizeof(*addrp)); 1016 return 1; 1017 } 1018 1019 return 0; 1020 } 1021
Indexes created Wed Sep 24 05:09:52 GMT 2025