parms.c revision 1.17
1 /* $NetBSD: parms.c,v 1.17 2002/11/30 04:04:23 christos 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 #include "defs.h" 37 #include "pathnames.h" 38 #include <sys/stat.h> 39 40 #ifdef __NetBSD__ 41 __RCSID("$NetBSD: parms.c,v 1.17 2002/11/30 04:04:23 christos Exp $"); 42 #elif defined(__FreeBSD__) 43 __RCSID("$FreeBSD$"); 44 #else 45 __RCSID("Revision: 2.26 "); 46 #ident "Revision: 2.26 " 47 #endif 48 49 50 struct parm *parms; 51 struct intnet *intnets; 52 struct r1net *r1nets; 53 struct tgate *tgates; 54 55 56 /* use configured parameters 57 */ 58 void 59 get_parms(struct interface *ifp) 60 { 61 static int warned_auth_in, warned_auth_out; 62 struct parm *parmp; 63 int i, num_passwds = 0; 64 65 /* get all relevant parameters 66 */ 67 for (parmp = parms; parmp != 0; parmp = parmp->parm_next) { 68 if (parmp->parm_name[0] == '\0' 69 || !strcmp(ifp->int_name, parmp->parm_name) 70 || (parmp->parm_name[0] == '\n' 71 && on_net(ifp->int_addr, 72 parmp->parm_net, parmp->parm_mask))) { 73 74 /* This group of parameters is relevant, 75 * so get its settings 76 */ 77 ifp->int_state |= parmp->parm_int_state; 78 for (i = 0; i < MAX_AUTH_KEYS; i++) { 79 if (parmp->parm_auth[0].type == RIP_AUTH_NONE 80 || num_passwds >= MAX_AUTH_KEYS) 81 break; 82 memcpy(&ifp->int_auth[num_passwds++], 83 &parmp->parm_auth[i], 84 sizeof(ifp->int_auth[0])); 85 } 86 if (parmp->parm_rdisc_pref != 0) 87 ifp->int_rdisc_pref = parmp->parm_rdisc_pref; 88 if (parmp->parm_rdisc_int != 0) 89 ifp->int_rdisc_int = parmp->parm_rdisc_int; 90 if (parmp->parm_adj_inmetric != 0) 91 ifp->int_adj_inmetric = parmp->parm_adj_inmetric; 92 if (parmp->parm_adj_outmetric != 0) 93 ifp->int_adj_outmetric = parmp->parm_adj_outmetric; 94 } 95 } 96 97 /* Set general defaults. 98 * 99 * Default poor-man's router discovery to a metric that will 100 * be heard by old versions of `routed`. They ignored received 101 * routes with metric 15. 102 */ 103 if ((ifp->int_state & IS_PM_RDISC) 104 && ifp->int_d_metric == 0) 105 ifp->int_d_metric = FAKE_METRIC; 106 107 if (ifp->int_rdisc_int == 0) 108 ifp->int_rdisc_int = DefMaxAdvertiseInterval; 109 110 if (!(ifp->int_if_flags & IFF_MULTICAST) 111 && !(ifp->int_state & IS_REMOTE)) 112 ifp->int_state |= IS_BCAST_RDISC; 113 114 if (ifp->int_if_flags & IFF_POINTOPOINT) { 115 ifp->int_state |= IS_BCAST_RDISC; 116 /* By default, point-to-point links should be passive 117 * about router-discovery for the sake of demand-dialing. 118 */ 119 if (0 == (ifp->int_state & GROUP_IS_SOL_OUT)) 120 ifp->int_state |= IS_NO_SOL_OUT; 121 if (0 == (ifp->int_state & GROUP_IS_ADV_OUT)) 122 ifp->int_state |= IS_NO_ADV_OUT; 123 } 124 125 if (0 != (ifp->int_state & (IS_PASSIVE | IS_REMOTE))) 126 ifp->int_state |= IS_NO_RDISC; 127 if (ifp->int_state & IS_PASSIVE) 128 ifp->int_state |= IS_NO_RIP; 129 130 if (!IS_RIP_IN_OFF(ifp->int_state) 131 && ifp->int_auth[0].type != RIP_AUTH_NONE 132 && !(ifp->int_state & IS_NO_RIPV1_IN) 133 && !warned_auth_in) { 134 msglog("Warning: RIPv1 input via %s" 135 " will be accepted without authentication", 136 ifp->int_name); 137 warned_auth_in = 1; 138 } 139 if (!IS_RIP_OUT_OFF(ifp->int_state) 140 && ifp->int_auth[0].type != RIP_AUTH_NONE 141 && !(ifp->int_state & IS_NO_RIPV1_OUT)) { 142 if (!warned_auth_out) { 143 msglog("Warning: RIPv1 output via %s" 144 " will be sent without authentication", 145 ifp->int_name); 146 warned_auth_out = 1; 147 } 148 } 149 } 150 151 152 /* Read a list of gateways from /etc/gateways and add them to our tables. 153 * 154 * This file contains a list of "remote" gateways. That is usually 155 * a gateway which we cannot immediately determine if it is present or 156 * not as we can do for those provided by directly connected hardware. 157 * 158 * If a gateway is marked "passive" in the file, then we assume it 159 * does not understand RIP and assume it is always present. Those 160 * not marked passive are treated as if they were directly connected 161 * and assumed to be broken if they do not send us advertisements. 162 * All remote interfaces are added to our list, and those not marked 163 * passive are sent routing updates. 164 * 165 * A passive interface can also be local, hardware interface exempt 166 * from RIP. 167 */ 168 void 169 gwkludge(void) 170 { 171 FILE *fp; 172 char *p, *lptr; 173 const char *cp; 174 char lbuf[200], net_host[5], dname[64+1+64+1]; 175 char gname[GNAME_LEN+1], qual[9]; 176 struct interface *ifp; 177 naddr dst, netmask, gate; 178 int metric, n, lnum; 179 struct stat sb; 180 u_int state; 181 const char *type; 182 183 184 fp = fopen(_PATH_GATEWAYS, "r"); 185 if (fp == 0) 186 return; 187 188 if (0 > fstat(fileno(fp), &sb)) { 189 msglog("could not stat() "_PATH_GATEWAYS); 190 (void)fclose(fp); 191 return; 192 } 193 194 for (lnum = 1; ; lnum++) { 195 if (0 == fgets(lbuf, sizeof(lbuf), fp)) 196 break; 197 lptr = lbuf; 198 while (*lptr == ' ') 199 lptr++; 200 p = lptr+strlen(lptr)-1; 201 while (*p == '\n' 202 || (*p == ' ' && (p == lptr+1 || *(p-1) != '\\'))) 203 *p-- = '\0'; 204 if (*lptr == '\0' /* ignore null and comment lines */ 205 || *lptr == '#') 206 continue; 207 208 /* notice newfangled parameter lines 209 */ 210 if (strncasecmp("net", lptr, 3) 211 && strncasecmp("host", lptr, 4)) { 212 cp = parse_parms(lptr, 213 (sb.st_uid == 0 214 && !(sb.st_mode&(S_IRWXG|S_IRWXO)))); 215 if (cp != 0) 216 msglog("%s in line %d of "_PATH_GATEWAYS, 217 cp, lnum); 218 continue; 219 } 220 221 /* {net | host} XX[/M] XX gateway XX metric DD [passive | external]\n */ 222 qual[0] = '\0'; 223 /* the '64' here must be GNAME_LEN */ 224 n = sscanf(lptr, "%4s %129[^ \t] gateway" 225 " %64[^ / \t] metric %u %8s\n", 226 net_host, dname, gname, &metric, qual); 227 if (n != 4 && n != 5) { 228 msglog("bad "_PATH_GATEWAYS" entry \"%s\"; %d values", 229 lptr, n); 230 continue; 231 } 232 if (metric >= HOPCNT_INFINITY) { 233 msglog("bad metric in "_PATH_GATEWAYS" entry \"%s\"", 234 lptr); 235 continue; 236 } 237 if (!strcasecmp(net_host, "host")) { 238 if (!gethost(dname, &dst)) { 239 msglog("bad host \"%s\" in "_PATH_GATEWAYS 240 " entry \"%s\"", dname, lptr); 241 continue; 242 } 243 netmask = HOST_MASK; 244 } else if (!strcasecmp(net_host, "net")) { 245 if (!getnet(dname, &dst, &netmask)) { 246 msglog("bad net \"%s\" in "_PATH_GATEWAYS 247 " entry \"%s\"", dname, lptr); 248 continue; 249 } 250 if (dst == RIP_DEFAULT) { 251 msglog("bad net \"%s\" in "_PATH_GATEWAYS 252 " entry \"%s\"--cannot be default", 253 dname, lptr); 254 continue; 255 } 256 HTONL(dst); /* make network # into IP address */ 257 } else { 258 msglog("bad \"%s\" in "_PATH_GATEWAYS 259 " entry \"%s\"", net_host, lptr); 260 continue; 261 } 262 263 if (!gethost(gname, &gate)) { 264 msglog("bad gateway \"%s\" in "_PATH_GATEWAYS 265 " entry \"%s\"", gname, lptr); 266 continue; 267 } 268 269 if (!strcasecmp(qual, type = "passive")) { 270 /* Passive entries are not placed in our tables, 271 * only the kernel's, so we don't copy all of the 272 * external routing information within a net. 273 * Internal machines should use the default 274 * route to a suitable gateway (like us). 275 */ 276 state = IS_REMOTE | IS_PASSIVE; 277 if (metric == 0) 278 metric = 1; 279 280 } else if (!strcasecmp(qual, type = "external")) { 281 /* External entries are handled by other means 282 * such as EGP, and are placed only in the daemon 283 * tables to prevent overriding them with something 284 * else. 285 */ 286 strcpy(qual,"external"); 287 state = IS_REMOTE | IS_PASSIVE | IS_EXTERNAL; 288 if (metric == 0) 289 metric = 1; 290 291 } else if (!strcasecmp(qual, "active") 292 || qual[0] == '\0') { 293 if (metric != 0) { 294 /* Entries that are neither "passive" nor 295 * "external" are "remote" and must behave 296 * like physical interfaces. If they are not 297 * heard from regularly, they are deleted. 298 */ 299 state = IS_REMOTE; 300 type = "remote"; 301 } else { 302 /* "remote" entries with a metric of 0 303 * are aliases for our own interfaces 304 */ 305 state = IS_REMOTE | IS_PASSIVE | IS_ALIAS; 306 type = "alias"; 307 } 308 309 } else { 310 msglog("bad "_PATH_GATEWAYS" entry \"%s\";" 311 " unknown type %s", lptr, qual); 312 continue; 313 } 314 315 if (0 != (state & (IS_PASSIVE | IS_REMOTE))) 316 state |= IS_NO_RDISC; 317 if (state & IS_PASSIVE) 318 state |= IS_NO_RIP; 319 320 ifp = check_dup(gate,dst,netmask,state); 321 if (ifp != 0) { 322 msglog("duplicate "_PATH_GATEWAYS" entry \"%s\"",lptr); 323 continue; 324 } 325 326 ifp = (struct interface *)rtmalloc(sizeof(*ifp), "gwkludge()"); 327 memset(ifp, 0, sizeof(*ifp)); 328 329 ifp->int_state = state; 330 if (netmask == HOST_MASK) 331 ifp->int_if_flags = IFF_POINTOPOINT | IFF_UP; 332 else 333 ifp->int_if_flags = IFF_UP; 334 ifp->int_act_time = NEVER; 335 ifp->int_addr = gate; 336 ifp->int_dstaddr = dst; 337 ifp->int_mask = netmask; 338 ifp->int_ripv1_mask = netmask; 339 ifp->int_std_mask = std_mask(gate); 340 ifp->int_net = ntohl(dst); 341 ifp->int_std_net = ifp->int_net & ifp->int_std_mask; 342 ifp->int_std_addr = htonl(ifp->int_std_net); 343 ifp->int_metric = metric; 344 if (!(state & IS_EXTERNAL) 345 && ifp->int_mask != ifp->int_std_mask) 346 ifp->int_state |= IS_SUBNET; 347 (void)sprintf(ifp->int_name, "%s(%s)", type, gname); 348 ifp->int_index = -1; 349 350 if_link(ifp); 351 } 352 353 /* After all of the parameter lines have been read, 354 * apply them to any remote interfaces. 355 */ 356 for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next) { 357 get_parms(ifp); 358 359 tot_interfaces++; 360 if (!IS_RIP_OFF(ifp->int_state)) 361 rip_interfaces++; 362 363 trace_if("Add", ifp); 364 } 365 366 (void)fclose(fp); 367 } 368 369 370 /* like strtok(), but honoring backslash and not changing the source string 371 */ 372 static int /* 0=ok, -1=bad */ 373 parse_quote(char **linep, /* look here */ 374 const char *delims, /* for these delimiters */ 375 char *delimp, /* 0 or put found delimiter here */ 376 char *buf, /* copy token to here */ 377 int lim) /* at most this many bytes */ 378 { 379 char c = '\0', *pc; 380 const char *p; 381 382 383 pc = *linep; 384 if (*pc == '\0') 385 return -1; 386 387 while (lim != 0) { 388 c = *pc++; 389 if (c == '\0') 390 break; 391 392 if (c == '\\' && *pc != '\0') { 393 if ((c = *pc++) == 'n') { 394 c = '\n'; 395 } else if (c == 'r') { 396 c = '\r'; 397 } else if (c == 't') { 398 c = '\t'; 399 } else if (c == 'b') { 400 c = '\b'; 401 } else if (c >= '0' && c <= '7') { 402 c -= '0'; 403 if (*pc >= '0' && *pc <= '7') { 404 c = (c<<3)+(*pc++ - '0'); 405 if (*pc >= '0' && *pc <= '7') 406 c = (c<<3)+(*pc++ - '0'); 407 } 408 } 409 410 } else { 411 for (p = delims; *p != '\0'; ++p) { 412 if (*p == c) 413 goto exit; 414 } 415 } 416 417 *buf++ = c; 418 --lim; 419 } 420 exit: 421 if (lim == 0) 422 return -1; 423 424 *buf = '\0'; /* terminate copy of token */ 425 if (delimp != 0) 426 *delimp = c; /* return delimiter */ 427 *linep = pc-1; /* say where we ended */ 428 return 0; 429 } 430 431 432 /* Parse password timestamp 433 */ 434 static char * 435 parse_ts(time_t *tp, 436 char **valp, 437 char *val0, 438 char *delimp, 439 char *buf, 440 u_int bufsize) 441 { 442 struct tm tm; 443 #if defined(sgi) || defined(__NetBSD__) 444 char *ptr; 445 #endif 446 447 if (0 > parse_quote(valp, "| ,\n\r", delimp, 448 buf,bufsize) 449 || buf[bufsize-1] != '\0' 450 || buf[bufsize-2] != '\0') { 451 sprintf(buf,"bad timestamp %.25s", val0); 452 return buf; 453 } 454 strcat(buf,"\n"); 455 memset(&tm, 0, sizeof(tm)); 456 #if defined(sgi) || defined(__NetBSD__) 457 ptr = strptime(buf, "%y/%m/%d@%H:%M\n", &tm); 458 if (ptr == NULL || *ptr != '\0') { 459 sprintf(buf,"bad timestamp %.25s", val0); 460 return buf; 461 } 462 #else 463 if (5 != sscanf(buf, "%u/%u/%u@%u:%u\n", 464 &tm.tm_year, &tm.tm_mon, &tm.tm_mday, 465 &tm.tm_hour, &tm.tm_min) 466 || tm.tm_mon < 1 || tm.tm_mon > 12 467 || tm.tm_mday < 1 || tm.tm_mday > 31) { 468 sprintf(buf,"bad timestamp %.25s", val0); 469 return buf; 470 } 471 tm.tm_mon--; 472 if (tm.tm_year <= 37) /* assume small years are in the */ 473 tm.tm_year += 100; /* 3rd millenium */ 474 #endif 475 476 if ((*tp = mktime(&tm)) == -1) { 477 sprintf(buf,"bad timestamp %.25s", val0); 478 return buf; 479 } 480 481 return 0; 482 } 483 484 485 /* Get a password, key ID, and expiration date in the format 486 * passwd|keyID|year/mon/day@hour:min|year/mon/day@hour:min 487 */ 488 static const char * /* 0 or error message */ 489 get_passwd(char *tgt, 490 char *val, 491 struct parm *parmp, 492 u_int16_t type, 493 int safe) /* 1=from secure file */ 494 { 495 static char buf[80]; 496 char *val0, *p, delim; 497 struct auth k, *ap, *ap2; 498 int i; 499 u_long l; 500 501 502 if (!safe) 503 return "ignore unsafe password"; 504 505 for (ap = parmp->parm_auth, i = 0; 506 ap->type != RIP_AUTH_NONE; i++, ap++) { 507 if (i >= MAX_AUTH_KEYS) 508 return "too many passwords"; 509 } 510 511 memset(&k, 0, sizeof(k)); 512 k.type = type; 513 k.end = -1-DAY; 514 515 val0 = val; 516 if (0 > parse_quote(&val, "| ,\n\r", &delim, 517 (char *)k.key, sizeof(k.key))) 518 return tgt; 519 520 if (delim != '|') { 521 if (type == RIP_AUTH_MD5) 522 return "missing Keyid"; 523 } else { 524 val0 = ++val; 525 buf[sizeof(buf)-1] = '\0'; 526 if (0 > parse_quote(&val, "| ,\n\r", &delim, buf,sizeof(buf)) 527 || buf[sizeof(buf)-1] != '\0' 528 || (l = strtoul(buf,&p,0)) > 255 529 || *p != '\0') { 530 sprintf(buf,"bad KeyID \"%.20s\"", val0); 531 return buf; 532 } 533 for (ap2 = parmp->parm_auth; ap2 < ap; ap2++) { 534 if (ap2->keyid == l) { 535 sprintf(buf,"duplicate KeyID \"%.20s\"", val0); 536 return buf; 537 } 538 } 539 k.keyid = (int)l; 540 541 if (delim == '|') { 542 val0 = ++val; 543 if (0 != (p = parse_ts(&k.start,&val,val0,&delim, 544 buf,sizeof(buf)))) 545 return p; 546 if (delim != '|') 547 return "missing second timestamp"; 548 val0 = ++val; 549 if (0 != (p = parse_ts(&k.end,&val,val0,&delim, 550 buf,sizeof(buf)))) 551 return p; 552 if ((u_long)k.start > (u_long)k.end) { 553 sprintf(buf,"out of order timestamp %.30s", 554 val0); 555 return buf; 556 } 557 } 558 } 559 if (delim != '\0') 560 return tgt; 561 562 memmove(ap, &k, sizeof(*ap)); 563 return 0; 564 } 565 566 567 static const char * 568 bad_str(const char *estr) 569 { 570 static char buf[100+8]; 571 572 sprintf(buf, "bad \"%.100s\"", estr); 573 return buf; 574 } 575 576 577 /* Parse a set of parameters for an interface. 578 */ 579 const char * /* 0 or error message */ 580 parse_parms(char *line, 581 int safe) /* 1=from secure file */ 582 { 583 #define PARS(str) (!strcasecmp(tgt, str)) 584 #define PARSEQ(str) (!strncasecmp(tgt, str"=", sizeof(str))) 585 #define CKF(g,b) {if (0 != (parm.parm_int_state & ((g) & ~(b)))) break; \ 586 parm.parm_int_state |= (b);} 587 struct parm parm; 588 struct intnet *intnetp; 589 struct r1net *r1netp; 590 struct tgate *tg; 591 naddr addr, mask; 592 char delim, *val0 = 0, *tgt, *val, *p; 593 const char *msg; 594 char buf[BUFSIZ], buf2[BUFSIZ]; 595 int i; 596 597 598 /* "subnet=x.y.z.u/mask[,metric]" must be alone on the line */ 599 if (!strncasecmp(line, "subnet=", sizeof("subnet=")-1) 600 && *(val = &line[sizeof("subnet=")-1]) != '\0') { 601 if (0 > parse_quote(&val, ",", &delim, buf, sizeof(buf))) 602 return bad_str(line); 603 intnetp = (struct intnet*)rtmalloc(sizeof(*intnetp), 604 "parse_parms subnet"); 605 intnetp->intnet_metric = 1; 606 if (delim == ',') { 607 intnetp->intnet_metric = (int)strtol(val+1,&p,0); 608 if (*p != '\0' 609 || intnetp->intnet_metric <= 0 610 || intnetp->intnet_metric >= HOPCNT_INFINITY) 611 return bad_str(line); 612 } 613 if (!getnet(buf, &intnetp->intnet_addr, &intnetp->intnet_mask) 614 || intnetp->intnet_mask == HOST_MASK 615 || intnetp->intnet_addr == RIP_DEFAULT) { 616 free(intnetp); 617 return bad_str(line); 618 } 619 HTONL(intnetp->intnet_addr); 620 intnetp->intnet_next = intnets; 621 intnets = intnetp; 622 return 0; 623 } 624 625 /* "ripv1_mask=x.y.z.u/mask1,mask2" must be alone on the line. 626 * This requires that x.y.z.u/mask1 be considered a subnet of 627 * x.y.z.u/mask2, as if x.y.z.u/mask2 were a class-full network. 628 */ 629 if (!strncasecmp(line, "ripv1_mask=", sizeof("ripv1_mask=")-1) 630 && *(val = &line[sizeof("ripv1_mask=")-1]) != '\0') { 631 if (0 > parse_quote(&val, ",", &delim, buf, sizeof(buf)) 632 || delim == '\0') 633 return bad_str(line); 634 if ((i = (int)strtol(val+1, &p, 0)) <= 0 635 || i > 32 || *p != '\0') 636 return bad_str(line); 637 r1netp = (struct r1net *)rtmalloc(sizeof(*r1netp), 638 "parse_parms ripv1_mask"); 639 r1netp->r1net_mask = HOST_MASK << (32-i); 640 if (!getnet(buf, &r1netp->r1net_net, &r1netp->r1net_match) 641 || r1netp->r1net_net == RIP_DEFAULT 642 || r1netp->r1net_mask > r1netp->r1net_match) { 643 free(r1netp); 644 return bad_str(line); 645 } 646 r1netp->r1net_next = r1nets; 647 r1nets = r1netp; 648 return 0; 649 } 650 651 memset(&parm, 0, sizeof(parm)); 652 653 for (;;) { 654 tgt = line + strspn(line, " ,\n\r"); 655 if (*tgt == '\0' || *tgt == '#') 656 break; 657 line = tgt+strcspn(tgt, "= #,\n\r"); 658 delim = *line; 659 if (delim == '=') { 660 val0 = ++line; 661 if (0 > parse_quote(&line, " #,\n\r",&delim, 662 buf,sizeof(buf))) 663 return bad_str(tgt); 664 } 665 if (delim != '\0') { 666 for (;;) { 667 *line = '\0'; 668 if (delim == '#') 669 break; 670 ++line; 671 if (delim != ' ' 672 || (delim = *line) != ' ') 673 break; 674 } 675 } 676 677 if (PARSEQ("if")) { 678 if (parm.parm_name[0] != '\0' 679 || strlen(buf) > IF_NAME_LEN) 680 return bad_str(tgt); 681 strcpy(parm.parm_name, buf); 682 683 } else if (PARSEQ("addr")) { 684 /* This is a bad idea, because the address based 685 * sets of parameters cannot be checked for 686 * consistency with the interface name parameters. 687 * The parm_net stuff is needed to allow several 688 * -F settings. 689 */ 690 if (!getnet(val0, &addr, &mask) 691 || parm.parm_name[0] != '\0') 692 return bad_str(tgt); 693 parm.parm_net = addr; 694 parm.parm_mask = mask; 695 parm.parm_name[0] = '\n'; 696 697 } else if (PARSEQ("passwd")) { 698 /* since cleartext passwords are so weak allow 699 * them anywhere 700 */ 701 msg = get_passwd(tgt,val0,&parm,RIP_AUTH_PW,1); 702 if (msg) { 703 *val0 = '\0'; 704 return bad_str(msg); 705 } 706 707 } else if (PARSEQ("md5_passwd")) { 708 msg = get_passwd(tgt,val0,&parm,RIP_AUTH_MD5,safe); 709 if (msg) { 710 *val0 = '\0'; 711 return bad_str(msg); 712 } 713 714 } else if (PARS("no_ag")) { 715 parm.parm_int_state |= (IS_NO_AG | IS_NO_SUPER_AG); 716 717 } else if (PARS("no_super_ag")) { 718 parm.parm_int_state |= IS_NO_SUPER_AG; 719 720 } else if (PARS("no_ripv1_in")) { 721 parm.parm_int_state |= IS_NO_RIPV1_IN; 722 723 } else if (PARS("no_ripv2_in")) { 724 parm.parm_int_state |= IS_NO_RIPV2_IN; 725 726 } else if (PARS("ripv2_out")) { 727 if (parm.parm_int_state & IS_NO_RIPV2_OUT) 728 return bad_str(tgt); 729 parm.parm_int_state |= IS_NO_RIPV1_OUT; 730 731 } else if (PARS("ripv2")) { 732 if ((parm.parm_int_state & IS_NO_RIPV2_OUT) 733 || (parm.parm_int_state & IS_NO_RIPV2_IN)) 734 return bad_str(tgt); 735 parm.parm_int_state |= (IS_NO_RIPV1_IN 736 | IS_NO_RIPV1_OUT); 737 738 } else if (PARS("no_rip")) { 739 CKF(IS_PM_RDISC, IS_NO_RIP); 740 741 } else if (PARS("no_rip_mcast")) { 742 parm.parm_int_state |= IS_NO_RIP_MCAST; 743 744 } else if (PARS("no_rdisc")) { 745 CKF((GROUP_IS_SOL_OUT|GROUP_IS_ADV_OUT), IS_NO_RDISC); 746 747 } else if (PARS("no_solicit")) { 748 CKF(GROUP_IS_SOL_OUT, IS_NO_SOL_OUT); 749 750 } else if (PARS("send_solicit")) { 751 CKF(GROUP_IS_SOL_OUT, IS_SOL_OUT); 752 753 } else if (PARS("no_rdisc_adv")) { 754 CKF(GROUP_IS_ADV_OUT, IS_NO_ADV_OUT); 755 756 } else if (PARS("rdisc_adv")) { 757 CKF(GROUP_IS_ADV_OUT, IS_ADV_OUT); 758 759 } else if (PARS("bcast_rdisc")) { 760 parm.parm_int_state |= IS_BCAST_RDISC; 761 762 } else if (PARS("passive")) { 763 CKF((GROUP_IS_SOL_OUT|GROUP_IS_ADV_OUT), IS_NO_RDISC); 764 parm.parm_int_state |= IS_NO_RIP | IS_PASSIVE; 765 766 } else if (PARSEQ("rdisc_pref")) { 767 if (parm.parm_rdisc_pref != 0 768 || (parm.parm_rdisc_pref = (int)strtol(buf,&p,0), 769 *p != '\0')) 770 return bad_str(tgt); 771 772 } else if (PARS("pm_rdisc")) { 773 if (IS_RIP_OUT_OFF(parm.parm_int_state)) 774 return bad_str(tgt); 775 parm.parm_int_state |= IS_PM_RDISC; 776 777 } else if (PARSEQ("rdisc_interval")) { 778 if (parm.parm_rdisc_int != 0 779 || (parm.parm_rdisc_int = (int)strtoul(buf,&p,0), 780 *p != '\0') 781 || parm.parm_rdisc_int < MinMaxAdvertiseInterval 782 || parm.parm_rdisc_int > MaxMaxAdvertiseInterval) 783 return bad_str(tgt); 784 785 } else if (PARSEQ("fake_default")) { 786 if (parm.parm_d_metric != 0 787 || IS_RIP_OUT_OFF(parm.parm_int_state) 788 || (i = strtoul(buf,&p,0), *p != '\0') 789 || i > HOPCNT_INFINITY-1) 790 return bad_str(tgt); 791 parm.parm_d_metric = i; 792 793 } else if (PARSEQ("adj_inmetric")) { 794 if (parm.parm_adj_inmetric != 0 795 || (i = strtoul(buf,&p,0), *p != '\0') 796 || i > HOPCNT_INFINITY-1) 797 return bad_str(tgt); 798 parm.parm_adj_inmetric = i; 799 800 } else if (PARSEQ("adj_outmetric")) { 801 if (parm.parm_adj_outmetric != 0 802 || (i = strtoul(buf,&p,0), *p != '\0') 803 || i > HOPCNT_INFINITY-1) 804 return bad_str(tgt); 805 parm.parm_adj_outmetric = i; 806 807 } else if (PARSEQ("trust_gateway")) { 808 /* look for trust_gateway=x.y.z|net/mask|...) */ 809 p = buf; 810 if (0 > parse_quote(&p, "|", &delim, 811 buf2, sizeof(buf2)) 812 || !gethost(buf2,&addr)) 813 return bad_str(tgt); 814 tg = (struct tgate *)rtmalloc(sizeof(*tg), 815 "parse_parms" 816 "trust_gateway"); 817 memset(tg, 0, sizeof(*tg)); 818 tg->tgate_addr = addr; 819 i = 0; 820 /* The default is to trust all routes. */ 821 while (delim == '|') { 822 p++; 823 if (i >= MAX_TGATE_NETS 824 || 0 > parse_quote(&p, "|", &delim, 825 buf2, sizeof(buf2)) 826 || !getnet(buf2, &tg->tgate_nets[i].net, 827 &tg->tgate_nets[i].mask) 828 || tg->tgate_nets[i].net == RIP_DEFAULT 829 || tg->tgate_nets[i].mask == 0) 830 return bad_str(tgt); 831 i++; 832 } 833 tg->tgate_next = tgates; 834 tgates = tg; 835 parm.parm_int_state |= IS_DISTRUST; 836 837 } else if (PARS("redirect_ok")) { 838 parm.parm_int_state |= IS_REDIRECT_OK; 839 840 } else { 841 return bad_str(tgt); /* error */ 842 } 843 } 844 845 return check_parms(&parm); 846 #undef PARS 847 #undef PARSEQ 848 } 849 850 851 /* check for duplicate parameter specifications */ 852 const char * /* 0 or error message */ 853 check_parms(struct parm *new) 854 { 855 struct parm *parmp, **parmpp; 856 int i, num_passwds; 857 858 /* set implicit values 859 */ 860 if (new->parm_int_state & IS_NO_ADV_IN) 861 new->parm_int_state |= IS_NO_SOL_OUT; 862 if (new->parm_int_state & IS_NO_SOL_OUT) 863 new->parm_int_state |= IS_NO_ADV_IN; 864 865 for (i = num_passwds = 0; i < MAX_AUTH_KEYS; i++) { 866 if (new->parm_auth[i].type != RIP_AUTH_NONE) 867 num_passwds++; 868 } 869 870 /* compare with existing sets of parameters 871 */ 872 for (parmpp = &parms; 873 (parmp = *parmpp) != 0; 874 parmpp = &parmp->parm_next) { 875 if (strcmp(new->parm_name, parmp->parm_name)) 876 continue; 877 if (!on_net(htonl(parmp->parm_net), 878 new->parm_net, new->parm_mask) 879 && !on_net(htonl(new->parm_net), 880 parmp->parm_net, parmp->parm_mask)) 881 continue; 882 883 for (i = 0; i < MAX_AUTH_KEYS; i++) { 884 if (parmp->parm_auth[i].type != RIP_AUTH_NONE) 885 num_passwds++; 886 } 887 if (num_passwds > MAX_AUTH_KEYS) 888 return "too many conflicting passwords"; 889 890 if ((0 != (new->parm_int_state & GROUP_IS_SOL_OUT) 891 && 0 != (parmp->parm_int_state & GROUP_IS_SOL_OUT) 892 && 0 != ((new->parm_int_state ^ parmp->parm_int_state) 893 && GROUP_IS_SOL_OUT)) 894 || (0 != (new->parm_int_state & GROUP_IS_ADV_OUT) 895 && 0 != (parmp->parm_int_state & GROUP_IS_ADV_OUT) 896 && 0 != ((new->parm_int_state ^ parmp->parm_int_state) 897 && GROUP_IS_ADV_OUT)) 898 || (new->parm_rdisc_pref != 0 899 && parmp->parm_rdisc_pref != 0 900 && new->parm_rdisc_pref != parmp->parm_rdisc_pref) 901 || (new->parm_rdisc_int != 0 902 && parmp->parm_rdisc_int != 0 903 && new->parm_rdisc_int != parmp->parm_rdisc_int)) { 904 return ("conflicting, duplicate router discovery" 905 " parameters"); 906 907 } 908 909 if (new->parm_d_metric != 0 910 && parmp->parm_d_metric != 0 911 && new->parm_d_metric != parmp->parm_d_metric) { 912 return ("conflicting, duplicate poor man's router" 913 " discovery or fake default metric"); 914 } 915 916 if (new->parm_adj_inmetric != 0 917 && parmp->parm_adj_inmetric != 0 918 && new->parm_adj_inmetric != parmp->parm_adj_inmetric) { 919 return ("conflicting interface input " 920 "metric adjustments"); 921 } 922 923 if (new->parm_adj_outmetric != 0 924 && parmp->parm_adj_outmetric != 0 925 && new->parm_adj_outmetric != parmp->parm_adj_outmetric) { 926 return ("conflicting interface output " 927 "metric adjustments"); 928 } 929 } 930 931 /* link new entry on the list so that when the entries are scanned, 932 * they affect the result in the order the operator specified. 933 */ 934 parmp = (struct parm*)rtmalloc(sizeof(*parmp), "check_parms"); 935 memcpy(parmp, new, sizeof(*parmp)); 936 *parmpp = parmp; 937 938 return 0; 939 } 940 941 942 /* get a network number as a name or a number, with an optional "/xx" 943 * netmask. 944 */ 945 int /* 0=bad */ 946 getnet(char *name, 947 naddr *netp, /* network in host byte order */ 948 naddr *maskp) /* masks are always in host order */ 949 { 950 int i; 951 struct netent *np; 952 naddr mask; /* in host byte order */ 953 struct in_addr in; /* a network and so host byte order */ 954 char hname[MAXHOSTNAMELEN+1]; 955 char *mname, *p; 956 957 958 /* Detect and separate "1.2.3.4/24" 959 */ 960 if (0 != (mname = strrchr(name,'/'))) { 961 i = (int)(mname - name); 962 if (i > (int)sizeof(hname)-1) /* name too long */ 963 return 0; 964 memmove(hname, name, i); 965 hname[i] = '\0'; 966 mname++; 967 name = hname; 968 } 969 970 np = getnetbyname(name); 971 if (np != 0) { 972 in.s_addr = (naddr)np->n_net; 973 if (0 == (in.s_addr & 0xff000000)) 974 in.s_addr <<= 8; 975 if (0 == (in.s_addr & 0xff000000)) 976 in.s_addr <<= 8; 977 if (0 == (in.s_addr & 0xff000000)) 978 in.s_addr <<= 8; 979 } else if (inet_aton(name, &in) == 1) { 980 NTOHL(in.s_addr); 981 } else if (!mname && !strcasecmp(name,"default")) { 982 in.s_addr = RIP_DEFAULT; 983 } else { 984 return 0; 985 } 986 987 if (!mname) { 988 /* we cannot use the interfaces here because we have not 989 * looked at them yet. 990 */ 991 mask = std_mask(htonl(in.s_addr)); 992 if ((~mask & in.s_addr) != 0) 993 mask = HOST_MASK; 994 } else { 995 mask = (naddr)strtoul(mname, &p, 0); 996 if (*p != '\0' || mask > 32) 997 return 0; 998 if (mask != 0) 999 mask = HOST_MASK << (32-mask); 1000 } 1001 1002 /* must have mask of 0 with default */ 1003 if (mask != 0 && in.s_addr == RIP_DEFAULT) 1004 return 0; 1005 /* no host bits allowed in a network number */ 1006 if ((~mask & in.s_addr) != 0) 1007 return 0; 1008 /* require non-zero network number */ 1009 if ((mask & in.s_addr) == 0 && in.s_addr != RIP_DEFAULT) 1010 return 0; 1011 if (in.s_addr>>24 == 0 && in.s_addr != RIP_DEFAULT) 1012 return 0; 1013 if (in.s_addr>>24 == 0xff) 1014 return 0; 1015 1016 *netp = in.s_addr; 1017 *maskp = mask; 1018 return 1; 1019 } 1020 1021 1022 int /* 0=bad */ 1023 gethost(char *name, 1024 naddr *addrp) 1025 { 1026 struct hostent *hp; 1027 struct in_addr in; 1028 1029 1030 /* Try for a number first, even in IRIX where gethostbyname() 1031 * is smart. This avoids hitting the name server which 1032 * might be sick because routing is. 1033 */ 1034 if (inet_aton(name, &in) == 1) { 1035 /* get a good number, but check that it it makes some 1036 * sense. 1037 */ 1038 if (ntohl(in.s_addr)>>24 == 0 1039 || ntohl(in.s_addr)>>24 == 0xff) 1040 return 0; 1041 *addrp = in.s_addr; 1042 return 1; 1043 } 1044 1045 hp = gethostbyname(name); 1046 if (hp) { 1047 memcpy(addrp, hp->h_addr, sizeof(*addrp)); 1048 return 1; 1049 } 1050 1051 return 0; 1052 } 1053
Indexes created Thu Sep 25 16:09:42 GMT 2025