sbin/routed/parms.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   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. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  * $FreeBSD$
  32  */
  33
  34 #include "defs.h"
  35 #include "pathnames.h"
  36 #include <sys/stat.h>
  37
  38 __RCSID("$FreeBSD$");
  39
  40
  41 static struct parm *parms;
  42 struct intnet *intnets;
  43 struct r1net *r1nets;
  44 struct tgate *tgates;
  45
  46
  47 /* use configured parameters
  48  */
  49 void
  50 get_parms(struct interface *ifp)
  51 {
  52         static int warned_auth_in, warned_auth_out;
  53         struct parm *parmp;
  54         int i, num_passwds = 0;
  55
  56         /* get all relevant parameters
  57          */
  58         for (parmp = parms; parmp != NULL; parmp = parmp->parm_next) {
  59                 if (parmp->parm_name[0] == '\0'
  60                     || !strcmp(ifp->int_name, parmp->parm_name)
  61                     || (parmp->parm_name[0] == '\n'
  62                         && on_net(ifp->int_addr,
  63                                   parmp->parm_net, parmp->parm_mask))) {
  64
  65                         /* This group of parameters is relevant,
  66                          * so get its settings
  67                          */
  68                         ifp->int_state |= parmp->parm_int_state;
  69                         for (i = 0; i < MAX_AUTH_KEYS; i++) {
  70                                 if (parmp->parm_auth[0].type == RIP_AUTH_NONE
  71                                     || num_passwds >= MAX_AUTH_KEYS)
  72                                         break;
  73                                 memcpy(&ifp->int_auth[num_passwds++],
  74                                        &parmp->parm_auth[i],
  75                                        sizeof(ifp->int_auth[0]));
  76                         }
  77                         if (parmp->parm_rdisc_pref != 0)
  78                                 ifp->int_rdisc_pref = parmp->parm_rdisc_pref;
  79                         if (parmp->parm_rdisc_int != 0)
  80                                 ifp->int_rdisc_int = parmp->parm_rdisc_int;
  81                         if (parmp->parm_adj_inmetric != 0)
  82                             ifp->int_adj_inmetric = parmp->parm_adj_inmetric;
  83                         if (parmp->parm_adj_outmetric != 0)
  84                             ifp->int_adj_outmetric = parmp->parm_adj_outmetric;
  85                 }
  86         }
  87
  88         /* Set general defaults.
  89          *
  90          * Default poor-man's router discovery to a metric that will
  91          * be heard by old versions of `routed`.  They ignored received
  92          * routes with metric 15.
  93          */
  94         if ((ifp->int_state & IS_PM_RDISC)
  95             && ifp->int_d_metric == 0)
  96                 ifp->int_d_metric = FAKE_METRIC;
  97
  98         if (ifp->int_rdisc_int == 0)
  99                 ifp->int_rdisc_int = DefMaxAdvertiseInterval;
 100
 101         if (!(ifp->int_if_flags & IFF_MULTICAST)
 102             && !(ifp->int_state & IS_REMOTE))
 103                 ifp->int_state |= IS_BCAST_RDISC;
 104
 105         if (ifp->int_if_flags & IFF_POINTOPOINT) {
 106                 ifp->int_state |= IS_BCAST_RDISC;
 107                 /* By default, point-to-point links should be passive
 108                  * about router-discovery for the sake of demand-dialing.
 109                  */
 110                 if (0 == (ifp->int_state & GROUP_IS_SOL_OUT))
 111                         ifp->int_state |= IS_NO_SOL_OUT;
 112                 if (0 == (ifp->int_state & GROUP_IS_ADV_OUT))
 113                         ifp->int_state |= IS_NO_ADV_OUT;
 114         }
 115
 116         if (0 != (ifp->int_state & (IS_PASSIVE | IS_REMOTE)))
 117                 ifp->int_state |= IS_NO_RDISC;
 118         if (ifp->int_state & IS_PASSIVE)
 119                 ifp->int_state |= IS_NO_RIP;
 120
 121         if (!IS_RIP_IN_OFF(ifp->int_state)
 122             && ifp->int_auth[0].type != RIP_AUTH_NONE
 123             && !(ifp->int_state & IS_NO_RIPV1_IN)
 124             && !warned_auth_in) {
 125                 msglog("Warning: RIPv1 input via %s"
 126                        " will be accepted without authentication",
 127                        ifp->int_name);
 128                 warned_auth_in = 1;
 129         }
 130         if (!IS_RIP_OUT_OFF(ifp->int_state)
 131             && ifp->int_auth[0].type != RIP_AUTH_NONE
 132             && !(ifp->int_state & IS_NO_RIPV1_OUT)) {
 133                 if (!warned_auth_out) {
 134                         msglog("Warning: RIPv1 output via %s"
 135                                " will be sent without authentication",
 136                                ifp->int_name);
 137                         warned_auth_out = 1;
 138                 }
 139         }
 140 }
 141
 142
 143 /* Read a list of gateways from /etc/gateways and add them to our tables.
 144  *
 145  * This file contains a list of "remote" gateways.  That is usually
 146  * a gateway which we cannot immediately determine if it is present or
 147  * not as we can do for those provided by directly connected hardware.
 148  *
 149  * If a gateway is marked "passive" in the file, then we assume it
 150  * does not understand RIP and assume it is always present.  Those
 151  * not marked passive are treated as if they were directly connected
 152  * and assumed to be broken if they do not send us advertisements.
 153  * All remote interfaces are added to our list, and those not marked
 154  * passive are sent routing updates.
 155  *
 156  * A passive interface can also be local, hardware interface exempt
 157  * from RIP.
 158  */
 159 void
 160 gwkludge(void)
 161 {
 162         FILE *fp;
 163         char *p, *lptr;
 164         const char *cp;
 165         char lbuf[200], net_host[5], dname[64+1+64+1];
 166         char gname[GNAME_LEN+1], qual[9];
 167         struct interface *ifp;
 168         naddr dst, netmask, gate;
 169         int metric, n, lnum;
 170         struct stat sb;
 171         u_int state;
 172         const char *type;
 173
 174
 175         fp = fopen(_PATH_GATEWAYS, "r");
 176         if (fp == NULL)
 177                 return;
 178
 179         if (0 > fstat(fileno(fp), &sb)) {
 180                 msglog("could not stat() "_PATH_GATEWAYS);
 181                 (void)fclose(fp);
 182                 return;
 183         }
 184
 185         for (lnum = 1; ; lnum++) {
 186                 if (fgets(lbuf, sizeof(lbuf), fp) == NULL)
 187                         break;
 188                 lptr = lbuf;
 189                 while (*lptr == ' ')
 190                         lptr++;
 191                 p = lptr+strlen(lptr)-1;
 192                 while (*p == '\n'
 193                        || (*p == ' ' && (p == lptr+1 || *(p-1) != '\\')))
 194                         *p-- = '\0';
 195                 if (*lptr == '\0'       /* ignore null and comment lines */
 196                     || *lptr == '#')
 197                         continue;
 198
 199                 /* notice newfangled parameter lines
 200                  */
 201                 if (strncasecmp("net", lptr, 3)
 202                     && strncasecmp("host", lptr, 4)) {
 203                         cp = parse_parms(lptr,
 204                                          (sb.st_uid == 0
 205                                           && !(sb.st_mode&(S_IRWXG|S_IRWXO))));
 206                         if (cp != NULL)
 207                                 msglog("%s in line %d of "_PATH_GATEWAYS,
 208                                        cp, lnum);
 209                         continue;
 210                 }
 211
 212 /*  {net | host} XX[/M] XX gateway XX metric DD [passive | external]\n */
 213                 qual[0] = '\0';
 214                 /* the '64' here must be GNAME_LEN */
 215                 n = sscanf(lptr, "%4s %129[^ \t] gateway"
 216                            " %64[^ / \t] metric %u %8s\n",
 217                            net_host, dname, gname, &metric, qual);
 218                 if (n != 4 && n != 5) {
 219                         msglog("bad "_PATH_GATEWAYS" entry \"%s\"; %d values",
 220                                lptr, n);
 221                         continue;
 222                 }
 223                 if (metric >= HOPCNT_INFINITY) {
 224                         msglog("bad metric in "_PATH_GATEWAYS" entry \"%s\"",
 225                                lptr);
 226                         continue;
 227                 }
 228                 if (!strcasecmp(net_host, "host")) {
 229                         if (!gethost(dname, &dst)) {
 230                                 msglog("bad host \"%s\" in "_PATH_GATEWAYS
 231                                        " entry \"%s\"", dname, lptr);
 232                                 continue;
 233                         }
 234                         netmask = HOST_MASK;
 235                 } else if (!strcasecmp(net_host, "net")) {
 236                         if (!getnet(dname, &dst, &netmask)) {
 237                                 msglog("bad net \"%s\" in "_PATH_GATEWAYS
 238                                        " entry \"%s\"", dname, lptr);
 239                                 continue;
 240                         }
 241                         if (dst == RIP_DEFAULT) {
 242                                 msglog("bad net \"%s\" in "_PATH_GATEWAYS
 243                                        " entry \"%s\"--cannot be default",
 244                                        dname, lptr);
 245                                 continue;
 246                         }
 247                         /* Turn network # into IP address. */
 248                         dst = htonl(dst);
 249                 } else {
 250                         msglog("bad \"%s\" in "_PATH_GATEWAYS
 251                                " entry \"%s\"", net_host, lptr);
 252                         continue;
 253                 }
 254
 255                 if (!gethost(gname, &gate)) {
 256                         msglog("bad gateway \"%s\" in "_PATH_GATEWAYS
 257                                " entry \"%s\"", gname, lptr);
 258                         continue;
 259                 }
 260
 261                 if (!strcasecmp(qual, type = "passive")) {
 262                         /* Passive entries are not placed in our tables,
 263                          * only the kernel's, so we don't copy all of the
 264                          * external routing information within a net.
 265                          * Internal machines should use the default
 266                          * route to a suitable gateway (like us).
 267                          */
 268                         state = IS_REMOTE | IS_PASSIVE;
 269                         if (metric == 0)
 270                                 metric = 1;
 271
 272                 } else if (!strcasecmp(qual, type = "external")) {
 273                         /* External entries are handled by other means
 274                          * such as EGP, and are placed only in the daemon
 275                          * tables to prevent overriding them with something
 276                          * else.
 277                          */
 278                         strcpy(qual,"external");
 279                         state = IS_REMOTE | IS_PASSIVE | IS_EXTERNAL;
 280                         if (metric == 0)
 281                                 metric = 1;
 282
 283                 } else if (!strcasecmp(qual, "active")
 284                            || qual[0] == '\0') {
 285                         if (metric != 0) {
 286                                 /* Entries that are neither "passive" nor
 287                                  * "external" are "remote" and must behave
 288                                  * like physical interfaces.  If they are not
 289                                  * heard from regularly, they are deleted.
 290                                  */
 291                                 state = IS_REMOTE;
 292                                 type = "remote";
 293                         } else {
 294                                 /* "remote" entries with a metric of 0
 295                                  * are aliases for our own interfaces
 296                                  */
 297                                 state = IS_REMOTE | IS_PASSIVE | IS_ALIAS;
 298                                 type = "alias";
 299                         }
 300
 301                 } else {
 302                         msglog("bad "_PATH_GATEWAYS" entry \"%s\";"
 303                                " unknown type %s", lptr, qual);
 304                         continue;
 305                 }
 306
 307                 if (0 != (state & (IS_PASSIVE | IS_REMOTE)))
 308                         state |= IS_NO_RDISC;
 309                 if (state & IS_PASSIVE)
 310                         state |= IS_NO_RIP;
 311
 312                 ifp = check_dup(gate,dst,netmask,state);
 313                 if (ifp != NULL) {
 314                         msglog("duplicate "_PATH_GATEWAYS" entry \"%s\"",lptr);
 315                         continue;
 316                 }
 317
 318                 ifp = (struct interface *)rtmalloc(sizeof(*ifp), "gwkludge()");
 319                 memset(ifp, 0, sizeof(*ifp));
 320
 321                 ifp->int_state = state;
 322                 if (netmask == HOST_MASK)
 323                         ifp->int_if_flags = IFF_POINTOPOINT | IFF_UP;
 324                 else
 325                         ifp->int_if_flags = IFF_UP;
 326                 ifp->int_act_time = NEVER;
 327                 ifp->int_addr = gate;
 328                 ifp->int_dstaddr = dst;
 329                 ifp->int_mask = netmask;
 330                 ifp->int_ripv1_mask = netmask;
 331                 ifp->int_std_mask = std_mask(gate);
 332                 ifp->int_net = ntohl(dst);
 333                 ifp->int_std_net = ifp->int_net & ifp->int_std_mask;
 334                 ifp->int_std_addr = htonl(ifp->int_std_net);
 335                 ifp->int_metric = metric;
 336                 if (!(state & IS_EXTERNAL)
 337                     && ifp->int_mask != ifp->int_std_mask)
 338                         ifp->int_state |= IS_SUBNET;
 339                 (void)sprintf(ifp->int_name, "%s(%s)", type, gname);
 340                 ifp->int_index = -1;
 341
 342                 if_link(ifp);
 343         }
 344
 345         /* After all of the parameter lines have been read,
 346          * apply them to any remote interfaces.
 347          */
 348         LIST_FOREACH(ifp, &ifnet, int_list) {
 349                 get_parms(ifp);
 350
 351                 tot_interfaces++;
 352                 if (!IS_RIP_OFF(ifp->int_state))
 353                         rip_interfaces++;
 354
 355                 trace_if("Add", ifp);
 356         }
 357
 358         (void)fclose(fp);
 359 }
 360
 361
 362 /* like strtok(), but honoring backslash and not changing the source string
 363  */
 364 static int                              /* 0=ok, -1=bad */
 365 parse_quote(char **linep,               /* look here */
 366             const char *delims,         /* for these delimiters */
 367             char *delimp,               /* 0 or put found delimiter here */
 368             char *buf,                  /* copy token to here */
 369             int lim)                    /* at most this many bytes */
 370 {
 371         char c = '\0', *pc;
 372         const char *p;
 373
 374
 375         pc = *linep;
 376         if (*pc == '\0')
 377                 return -1;
 378
 379         while (lim != 0) {
 380                 c = *pc++;
 381                 if (c == '\0')
 382                         break;
 383
 384                 if (c == '\\' && *pc != '\0') {
 385                         if ((c = *pc++) == 'n') {
 386                                 c = '\n';
 387                         } else if (c == 'r') {
 388                                 c = '\r';
 389                         } else if (c == 't') {
 390                                 c = '\t';
 391                         } else if (c == 'b') {
 392                                 c = '\b';
 393                         } else if (c >= '0' && c <= '7') {
 394                                 c -= '0';
 395                                 if (*pc >= '0' && *pc <= '7') {
 396                                         c = (c<<3)+(*pc++ - '0');
 397                                         if (*pc >= '0' && *pc <= '7')
 398                                             c = (c<<3)+(*pc++ - '0');
 399                                 }
 400                         }
 401
 402                 } else {
 403                         for (p = delims; *p != '\0'; ++p) {
 404                                 if (*p == c)
 405                                         goto exit;
 406                         }
 407                 }
 408
 409                 *buf++ = c;
 410                 --lim;
 411         }
 412 exit:
 413         if (lim == 0)
 414                 return -1;
 415
 416         *buf = '\0';                    /* terminate copy of token */
 417         if (delimp != NULL)
 418                 *delimp = c;            /* return delimiter */
 419         *linep = pc-1;                  /* say where we ended */
 420         return 0;
 421 }
 422
 423
 424 /* Parse password timestamp
 425  */
 426 static char *
 427 parse_ts(time_t *tp,
 428          char **valp,
 429          char *val0,
 430          char *delimp,
 431          char *buf,
 432          u_int bufsize)
 433 {
 434         struct tm tm;
 435         char *ptr;
 436
 437         if (0 > parse_quote(valp, "| ,\n\r", delimp,
 438                             buf,bufsize)
 439             || buf[bufsize-1] != '\0'
 440             || buf[bufsize-2] != '\0') {
 441                 sprintf(buf,"bad timestamp %.25s", val0);
 442                 return buf;
 443         }
 444         strcat(buf,"\n");
 445         memset(&tm, 0, sizeof(tm));
 446         ptr = strptime(buf, "%y/%m/%d@%H:%M\n", &tm);
 447         if (ptr == NULL || *ptr != '\0') {
 448                 sprintf(buf,"bad timestamp %.25s", val0);
 449                 return buf;
 450         }
 451
 452         if ((*tp = mktime(&tm)) == -1) {
 453                 sprintf(buf,"bad timestamp %.25s", val0);
 454                 return buf;
 455         }
 456
 457         return 0;
 458 }
 459
 460
 461 /* Get a password, key ID, and expiration date in the format
 462  *      passwd|keyID|year/mon/day@hour:min|year/mon/day@hour:min
 463  */
 464 static const char *                     /* 0 or error message */
 465 get_passwd(char *tgt,
 466            char *val,
 467            struct parm *parmp,
 468            u_int16_t type,
 469            int safe)                    /* 1=from secure file */
 470 {
 471         static char buf[80];
 472         char *val0, *p, delim;
 473         struct auth k, *ap, *ap2;
 474         int i;
 475         u_long l;
 476
 477         assert(val != NULL);
 478         if (!safe)
 479                 return "ignore unsafe password";
 480
 481         for (ap = parmp->parm_auth, i = 0;
 482              ap->type != RIP_AUTH_NONE; i++, ap++) {
 483                 if (i >= MAX_AUTH_KEYS)
 484                         return "too many passwords";
 485         }
 486
 487         memset(&k, 0, sizeof(k));
 488         k.type = type;
 489         k.end = -1-DAY;
 490
 491         val0 = val;
 492         if (0 > parse_quote(&val, "| ,\n\r", &delim,
 493                             (char *)k.key, sizeof(k.key)))
 494                 return tgt;
 495
 496         if (delim != '|') {
 497                 if (type == RIP_AUTH_MD5)
 498                         return "missing Keyid";
 499         } else {
 500                 val0 = ++val;
 501                 buf[sizeof(buf)-1] = '\0';
 502                 if (0 > parse_quote(&val, "| ,\n\r", &delim, buf,sizeof(buf))
 503                     || buf[sizeof(buf)-1] != '\0'
 504                     || (l = strtoul(buf,&p,0)) > 255
 505                     || *p != '\0') {
 506                         sprintf(buf,"bad KeyID \"%.20s\"", val0);
 507                         return buf;
 508                 }
 509                 for (ap2 = parmp->parm_auth; ap2 < ap; ap2++) {
 510                         if (ap2->keyid == l) {
 511                                 sprintf(buf,"duplicate KeyID \"%.20s\"", val0);
 512                                 return buf;
 513                         }
 514                 }
 515                 k.keyid = (int)l;
 516
 517                 if (delim == '|') {
 518                         val0 = ++val;
 519                         if (NULL != (p = parse_ts(&k.start,&val,val0,&delim,
 520                                                   buf,sizeof(buf))))
 521                                 return p;
 522                         if (delim != '|')
 523                                 return "missing second timestamp";
 524                         val0 = ++val;
 525                         if (NULL != (p = parse_ts(&k.end,&val,val0,&delim,
 526                                                   buf,sizeof(buf))))
 527                                 return p;
 528                         if ((u_long)k.start > (u_long)k.end) {
 529                                 sprintf(buf,"out of order timestamp %.30s",
 530                                         val0);
 531                                 return buf;
 532                         }
 533                 }
 534         }
 535         if (delim != '\0')
 536                 return tgt;
 537
 538         memmove(ap, &k, sizeof(*ap));
 539         return 0;
 540 }
 541
 542
 543 static const char *
 544 bad_str(const char *estr)
 545 {
 546         static char buf[100+8];
 547
 548         sprintf(buf, "bad \"%.100s\"", estr);
 549         return buf;
 550 }
 551
 552
 553 /* Parse a set of parameters for an interface.
 554  */
 555 const char *                                    /* 0 or error message */
 556 parse_parms(char *line,
 557             int safe)                   /* 1=from secure file */
 558 {
 559 #define PARS(str) (!strcasecmp(tgt, str))
 560 #define PARSEQ(str) (!strncasecmp(tgt, str"=", sizeof(str)))
 561 #define CKF(g,b) {if (0 != (parm.parm_int_state & ((g) & ~(b)))) break; \
 562         parm.parm_int_state |= (b);}
 563         struct parm parm;
 564         struct intnet *intnetp;
 565         struct r1net *r1netp;
 566         struct tgate *tg;
 567         naddr addr, mask;
 568         char delim, *val0 = NULL, *tgt, *val, *p;
 569         const char *msg;
 570         char buf[BUFSIZ], buf2[BUFSIZ];
 571         int i;
 572
 573
 574         /* "subnet=x.y.z.u/mask[,metric]" must be alone on the line */
 575         if (!strncasecmp(line, "subnet=", sizeof("subnet=")-1)
 576             && *(val = &line[sizeof("subnet=")-1]) != '\0') {
 577                 if (0 > parse_quote(&val, ",", &delim, buf, sizeof(buf)))
 578                         return bad_str(line);
 579                 intnetp = (struct intnet*)rtmalloc(sizeof(*intnetp),
 580                                                    "parse_parms subnet");
 581                 intnetp->intnet_metric = 1;
 582                 if (delim == ',') {
 583                         intnetp->intnet_metric = (int)strtol(val+1,&p,0);
 584                         if (*p != '\0'
 585                             || intnetp->intnet_metric <= 0
 586                             || intnetp->intnet_metric >= HOPCNT_INFINITY) {
 587                                 free(intnetp);
 588                                 return bad_str(line);
 589                         }
 590                 }
 591                 if (!getnet(buf, &intnetp->intnet_addr, &intnetp->intnet_mask)
 592                     || intnetp->intnet_mask == HOST_MASK
 593                     || intnetp->intnet_addr == RIP_DEFAULT) {
 594                         free(intnetp);
 595                         return bad_str(line);
 596                 }
 597                 intnetp->intnet_addr = htonl(intnetp->intnet_addr);
 598                 intnetp->intnet_next = intnets;
 599                 intnets = intnetp;
 600                 return 0;
 601         }
 602
 603         /* "ripv1_mask=x.y.z.u/mask1,mask2" must be alone on the line.
 604          * This requires that x.y.z.u/mask1 be considered a subnet of
 605          * x.y.z.u/mask2, as if x.y.z.u/mask2 were a class-full network.
 606          */
 607         if (!strncasecmp(line, "ripv1_mask=", sizeof("ripv1_mask=")-1)
 608             && *(val = &line[sizeof("ripv1_mask=")-1]) != '\0') {
 609                 if (0 > parse_quote(&val, ",", &delim, buf, sizeof(buf))
 610                     || delim == '\0')
 611                         return bad_str(line);
 612                 if ((i = (int)strtol(val+1, &p, 0)) <= 0
 613                     || i > 32 || *p != '\0')
 614                         return bad_str(line);
 615                 r1netp = (struct r1net *)rtmalloc(sizeof(*r1netp),
 616                                                   "parse_parms ripv1_mask");
 617                 r1netp->r1net_mask = HOST_MASK << (32-i);
 618                 if (!getnet(buf, &r1netp->r1net_net, &r1netp->r1net_match)
 619                     || r1netp->r1net_net == RIP_DEFAULT
 620                     || r1netp->r1net_mask > r1netp->r1net_match) {
 621                         free(r1netp);
 622                         return bad_str(line);
 623                 }
 624                 r1netp->r1net_next = r1nets;
 625                 r1nets = r1netp;
 626                 return 0;
 627         }
 628
 629         memset(&parm, 0, sizeof(parm));
 630
 631         for (;;) {
 632                 tgt = line + strspn(line, " ,\n\r");
 633                 if (*tgt == '\0' || *tgt == '#')
 634                         break;
 635                 line = tgt+strcspn(tgt, "= #,\n\r");
 636                 delim = *line;
 637                 if (delim == '=') {
 638                         val0 = ++line;
 639                         if (0 > parse_quote(&line, " #,\n\r",&delim,
 640                                             buf,sizeof(buf)))
 641                                 return bad_str(tgt);
 642                 } else {
 643                         val0 = NULL;
 644                 }
 645                 if (delim != '\0') {
 646                         for (;;) {
 647                                 *line = '\0';
 648                                 if (delim == '#')
 649                                         break;
 650                                 ++line;
 651                                 if (delim != ' '
 652                                     || (delim = *line) != ' ')
 653                                         break;
 654                         }
 655                 }
 656
 657                 if (PARSEQ("if")) {
 658                         if (parm.parm_name[0] != '\0'
 659                             || strlen(buf) > IF_NAME_LEN)
 660                                 return bad_str(tgt);
 661                         strcpy(parm.parm_name, buf);
 662
 663                 } else if (PARSEQ("addr")) {
 664                         /* This is a bad idea, because the address based
 665                          * sets of parameters cannot be checked for
 666                          * consistency with the interface name parameters.
 667                          * The parm_net stuff is needed to allow several
 668                          * -F settings.
 669                          */
 670                         if (val0 == NULL || !getnet(val0, &addr, &mask)
 671                             || parm.parm_name[0] != '\0')
 672                                 return bad_str(tgt);
 673                         parm.parm_net = addr;
 674                         parm.parm_mask = mask;
 675                         parm.parm_name[0] = '\n';
 676
 677                 } else if (PARSEQ("passwd")) {
 678                         /* since cleartext passwords are so weak allow
 679                          * them anywhere
 680                          */
 681                         if (val0 == NULL)
 682                                 return bad_str("no passwd");
 683                         msg = get_passwd(tgt,val0,&parm,RIP_AUTH_PW,1);
 684                         if (msg) {
 685                                 *val0 = '\0';
 686                                 return bad_str(msg);
 687                         }
 688
 689                 } else if (PARSEQ("md5_passwd")) {
 690                         msg = get_passwd(tgt,val0,&parm,RIP_AUTH_MD5,safe);
 691                         if (msg) {
 692                                 *val0 = '\0';
 693                                 return bad_str(msg);
 694                         }
 695
 696                 } else if (PARS("no_ag")) {
 697                         parm.parm_int_state |= (IS_NO_AG | IS_NO_SUPER_AG);
 698
 699                 } else if (PARS("no_super_ag")) {
 700                         parm.parm_int_state |= IS_NO_SUPER_AG;
 701
 702                 } else if (PARS("no_rip_out")) {
 703                         parm.parm_int_state |= IS_NO_RIP_OUT;
 704
 705                 } else if (PARS("no_ripv1_in")) {
 706                         parm.parm_int_state |= IS_NO_RIPV1_IN;
 707
 708                 } else if (PARS("no_ripv2_in")) {
 709                         parm.parm_int_state |= IS_NO_RIPV2_IN;
 710
 711                 } else if (PARS("ripv2_out")) {
 712                         if (parm.parm_int_state & IS_NO_RIPV2_OUT)
 713                                 return bad_str(tgt);
 714                         parm.parm_int_state |= IS_NO_RIPV1_OUT;
 715
 716                 } else if (PARS("ripv2")) {
 717                         if ((parm.parm_int_state & IS_NO_RIPV2_OUT)
 718                             || (parm.parm_int_state & IS_NO_RIPV2_IN))
 719                                 return bad_str(tgt);
 720                         parm.parm_int_state |= (IS_NO_RIPV1_IN
 721                                                 | IS_NO_RIPV1_OUT);
 722
 723                 } else if (PARS("no_rip")) {
 724                         CKF(IS_PM_RDISC, IS_NO_RIP);
 725
 726                 } else if (PARS("no_rip_mcast")) {
 727                         parm.parm_int_state |= IS_NO_RIP_MCAST;
 728
 729                 } else if (PARS("no_rdisc")) {
 730                         CKF((GROUP_IS_SOL_OUT|GROUP_IS_ADV_OUT), IS_NO_RDISC);
 731
 732                 } else if (PARS("no_solicit")) {
 733                         CKF(GROUP_IS_SOL_OUT, IS_NO_SOL_OUT);
 734
 735                 } else if (PARS("send_solicit")) {
 736                         CKF(GROUP_IS_SOL_OUT, IS_SOL_OUT);
 737
 738                 } else if (PARS("no_rdisc_adv")) {
 739                         CKF(GROUP_IS_ADV_OUT, IS_NO_ADV_OUT);
 740
 741                 } else if (PARS("rdisc_adv")) {
 742                         CKF(GROUP_IS_ADV_OUT, IS_ADV_OUT);
 743
 744                 } else if (PARS("bcast_rdisc")) {
 745                         parm.parm_int_state |= IS_BCAST_RDISC;
 746
 747                 } else if (PARS("passive")) {
 748                         CKF((GROUP_IS_SOL_OUT|GROUP_IS_ADV_OUT), IS_NO_RDISC);
 749                         parm.parm_int_state |= IS_NO_RIP | IS_PASSIVE;
 750
 751                 } else if (PARSEQ("rdisc_pref")) {
 752                         if (parm.parm_rdisc_pref != 0
 753                             || (parm.parm_rdisc_pref = (int)strtol(buf,&p,0),
 754                                 *p != '\0'))
 755                                 return bad_str(tgt);
 756
 757                 } else if (PARS("pm_rdisc")) {
 758                         if (IS_RIP_OUT_OFF(parm.parm_int_state))
 759                                 return bad_str(tgt);
 760                         parm.parm_int_state |= IS_PM_RDISC;
 761
 762                 } else if (PARSEQ("rdisc_interval")) {
 763                         if (parm.parm_rdisc_int != 0
 764                             || (parm.parm_rdisc_int = (int)strtoul(buf,&p,0),
 765                                 *p != '\0')
 766                             || parm.parm_rdisc_int < MinMaxAdvertiseInterval
 767                             || parm.parm_rdisc_int > MaxMaxAdvertiseInterval)
 768                                 return bad_str(tgt);
 769
 770                 } else if (PARSEQ("fake_default")) {
 771                         if (parm.parm_d_metric != 0
 772                             || IS_RIP_OUT_OFF(parm.parm_int_state)
 773                             || (i = strtoul(buf,&p,0), *p != '\0')
 774                             || i > HOPCNT_INFINITY-1)
 775                                 return bad_str(tgt);
 776                         parm.parm_d_metric = i;
 777
 778                 } else if (PARSEQ("adj_inmetric")) {
 779                         if (parm.parm_adj_inmetric != 0
 780                             || (i = strtoul(buf,&p,0), *p != '\0')
 781                             || i > HOPCNT_INFINITY-1)
 782                                 return bad_str(tgt);
 783                         parm.parm_adj_inmetric = i;
 784
 785                 } else if (PARSEQ("adj_outmetric")) {
 786                         if (parm.parm_adj_outmetric != 0
 787                             || (i = strtoul(buf,&p,0), *p != '\0')
 788                             || i > HOPCNT_INFINITY-1)
 789                                 return bad_str(tgt);
 790                         parm.parm_adj_outmetric = i;
 791
 792                 } else if (PARSEQ("trust_gateway")) {
 793                         /* look for trust_gateway=x.y.z|net/mask|...) */
 794                         p = buf;
 795                         if (0 > parse_quote(&p, "|", &delim,
 796                                             buf2, sizeof(buf2))
 797                             || !gethost(buf2,&addr))
 798                                 return bad_str(tgt);
 799                         tg = (struct tgate *)rtmalloc(sizeof(*tg),
 800                                                       "parse_parms"
 801                                                       "trust_gateway");
 802                         memset(tg, 0, sizeof(*tg));
 803                         tg->tgate_addr = addr;
 804                         i = 0;
 805                         /* The default is to trust all routes. */
 806                         while (delim == '|') {
 807                                 p++;
 808                                 if (i >= MAX_TGATE_NETS
 809                                     || 0 > parse_quote(&p, "|", &delim,
 810                                                        buf2, sizeof(buf2))
 811                                     || !getnet(buf2, &tg->tgate_nets[i].net,
 812                                                &tg->tgate_nets[i].mask)
 813                                     || tg->tgate_nets[i].net == RIP_DEFAULT
 814                                     || tg->tgate_nets[i].mask == 0) {
 815                                         free(tg);
 816                                         return bad_str(tgt);
 817                                 }
 818                                 i++;
 819                         }
 820                         tg->tgate_next = tgates;
 821                         tgates = tg;
 822                         parm.parm_int_state |= IS_DISTRUST;
 823
 824                 } else if (PARS("redirect_ok")) {
 825                         parm.parm_int_state |= IS_REDIRECT_OK;
 826
 827                 } else {
 828                         return bad_str(tgt);    /* error */
 829                 }
 830         }
 831
 832         return check_parms(&parm);
 833 #undef PARS
 834 #undef PARSEQ
 835 }
 836
 837
 838 /* check for duplicate parameter specifications */
 839 const char *                            /* 0 or error message */
 840 check_parms(struct parm *new)
 841 {
 842         struct parm *parmp, **parmpp;
 843         int i, num_passwds;
 844
 845         /* set implicit values
 846          */
 847         if (new->parm_int_state & IS_NO_ADV_IN)
 848                 new->parm_int_state |= IS_NO_SOL_OUT;
 849         if (new->parm_int_state & IS_NO_SOL_OUT)
 850                 new->parm_int_state |= IS_NO_ADV_IN;
 851
 852         for (i = num_passwds = 0; i < MAX_AUTH_KEYS; i++) {
 853                 if (new->parm_auth[i].type != RIP_AUTH_NONE)
 854                         num_passwds++;
 855         }
 856
 857         /* compare with existing sets of parameters
 858          */
 859         for (parmpp = &parms;
 860              (parmp = *parmpp) != NULL;
 861              parmpp = &parmp->parm_next) {
 862                 if (strcmp(new->parm_name, parmp->parm_name))
 863                         continue;
 864                 if (!on_net(htonl(parmp->parm_net),
 865                             new->parm_net, new->parm_mask)
 866                     && !on_net(htonl(new->parm_net),
 867                                parmp->parm_net, parmp->parm_mask))
 868                         continue;
 869
 870                 for (i = 0; i < MAX_AUTH_KEYS; i++) {
 871                         if (parmp->parm_auth[i].type != RIP_AUTH_NONE)
 872                                 num_passwds++;
 873                 }
 874                 if (num_passwds > MAX_AUTH_KEYS)
 875                         return "too many conflicting passwords";
 876
 877                 if ((0 != (new->parm_int_state & GROUP_IS_SOL_OUT)
 878                      && 0 != (parmp->parm_int_state & GROUP_IS_SOL_OUT)
 879                      && 0 != ((new->parm_int_state ^ parmp->parm_int_state)
 880                               & GROUP_IS_SOL_OUT))
 881                     || (0 != (new->parm_int_state & GROUP_IS_ADV_OUT)
 882                         && 0 != (parmp->parm_int_state & GROUP_IS_ADV_OUT)
 883                         && 0 != ((new->parm_int_state ^ parmp->parm_int_state)
 884                                  & GROUP_IS_ADV_OUT))
 885                     || (new->parm_rdisc_pref != 0
 886                         && parmp->parm_rdisc_pref != 0
 887                         && new->parm_rdisc_pref != parmp->parm_rdisc_pref)
 888                     || (new->parm_rdisc_int != 0
 889                         && parmp->parm_rdisc_int != 0
 890                         && new->parm_rdisc_int != parmp->parm_rdisc_int)) {
 891                         return ("conflicting, duplicate router discovery"
 892                                 " parameters");
 893
 894                 }
 895
 896                 if (new->parm_d_metric != 0
 897                      && parmp->parm_d_metric != 0
 898                      && new->parm_d_metric != parmp->parm_d_metric) {
 899                         return ("conflicting, duplicate poor man's router"
 900                                 " discovery or fake default metric");
 901                 }
 902
 903                 if (new->parm_adj_inmetric != 0
 904                     && parmp->parm_adj_inmetric != 0
 905                     && new->parm_adj_inmetric != parmp->parm_adj_inmetric) {
 906                         return ("conflicting interface input "
 907                                 "metric adjustments");
 908                 }
 909
 910                 if (new->parm_adj_outmetric != 0
 911                     && parmp->parm_adj_outmetric != 0
 912                     && new->parm_adj_outmetric != parmp->parm_adj_outmetric) {
 913                         return ("conflicting interface output "
 914                                 "metric adjustments");
 915                 }
 916         }
 917
 918         /* link new entry on the list so that when the entries are scanned,
 919          * they affect the result in the order the operator specified.
 920          */
 921         parmp = (struct parm*)rtmalloc(sizeof(*parmp), "check_parms");
 922         memcpy(parmp, new, sizeof(*parmp));
 923         *parmpp = parmp;
 924
 925         return 0;
 926 }
 927
 928
 929 /* get a network number as a name or a number, with an optional "/xx"
 930  * netmask.
 931  */
 932 int                                     /* 0=bad */
 933 getnet(char *name,
 934        naddr *netp,                     /* network in host byte order */
 935        naddr *maskp)                    /* masks are always in host order */
 936 {
 937         int i;
 938         struct netent *np;
 939         naddr mask;                     /* in host byte order */
 940         struct in_addr in;              /* a network and so host byte order */
 941         char hname[MAXHOSTNAMELEN+1];
 942         char *mname, *p;
 943
 944
 945         /* Detect and separate "1.2.3.4/24"
 946          */
 947         if (NULL != (mname = strrchr(name,'/'))) {
 948                 i = (int)(mname - name);
 949                 if (i > (int)sizeof(hname)-1)   /* name too long */
 950                         return 0;
 951                 memmove(hname, name, i);
 952                 hname[i] = '\0';
 953                 mname++;
 954                 name = hname;
 955         }
 956
 957         np = getnetbyname(name);
 958         if (np != NULL) {
 959                 in.s_addr = (naddr)np->n_net;
 960                 if (0 == (in.s_addr & 0xff000000))
 961                         in.s_addr <<= 8;
 962                 if (0 == (in.s_addr & 0xff000000))
 963                         in.s_addr <<= 8;
 964                 if (0 == (in.s_addr & 0xff000000))
 965                         in.s_addr <<= 8;
 966         } else if (inet_aton(name, &in) == 1) {
 967                 in.s_addr = ntohl(in.s_addr);
 968         } else if (!mname && !strcasecmp(name,"default")) {
 969                 in.s_addr = RIP_DEFAULT;
 970         } else {
 971                 return 0;
 972         }
 973
 974         if (!mname) {
 975                 /* we cannot use the interfaces here because we have not
 976                  * looked at them yet.
 977                  */
 978                 mask = std_mask(htonl(in.s_addr));
 979                 if ((~mask & in.s_addr) != 0)
 980                         mask = HOST_MASK;
 981         } else {
 982                 mask = (naddr)strtoul(mname, &p, 0);
 983                 if (*p != '\0' || mask > 32)
 984                         return 0;
 985                 if (mask != 0)
 986                         mask = HOST_MASK << (32-mask);
 987         }
 988
 989         /* must have mask of 0 with default */
 990         if (mask != 0 && in.s_addr == RIP_DEFAULT)
 991                 return 0;
 992         /* no host bits allowed in a network number */
 993         if ((~mask & in.s_addr) != 0)
 994                 return 0;
 995         /* require non-zero network number */
 996         if ((mask & in.s_addr) == 0 && in.s_addr != RIP_DEFAULT)
 997                 return 0;
 998         if (in.s_addr>>24 == 0 && in.s_addr != RIP_DEFAULT)
 999                 return 0;
1000         if (in.s_addr>>24 == 0xff)
1001                 return 0;
1002
1003         *netp = in.s_addr;
1004         *maskp = mask;
1005         return 1;
1006 }
1007
1008
1009 int                                     /* 0=bad */
1010 gethost(char *name,
1011         naddr *addrp)
1012 {
1013         struct hostent *hp;
1014         struct in_addr in;
1015
1016
1017         /* Try for a number first, even in IRIX where gethostbyname()
1018          * is smart.  This avoids hitting the name server which
1019          * might be sick because routing is.
1020          */
1021         if (inet_aton(name, &in) == 1) {
1022                 /* get a good number, but check that it it makes some
1023                  * sense.
1024                  */
1025                 if (ntohl(in.s_addr)>>24 == 0
1026                     || ntohl(in.s_addr)>>24 == 0xff)
1027                         return 0;
1028                 *addrp = in.s_addr;
1029                 return 1;
1030         }
1031
1032         hp = gethostbyname(name);
1033         if (hp) {
1034                 memcpy(addrp, hp->h_addr, sizeof(*addrp));
1035                 return 1;
1036         }
1037
1038         return 0;
1039 }