sbin/routed/parms.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgment:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * $FreeBSD: src/sbin/routed/parms.c,v 1.7.2.1 2000/08/14 17:00:03 sheldonh Exp $
  34  * $DragonFly: src/sbin/routed/parms.c,v 1.4 2004/12/18 21:43:40 swildner Exp $
  35  */
  36
  37 #include "defs.h"
  38 #include "pathnames.h"
  39 #include <sys/stat.h>
  40
  41 #if !defined(sgi) && !defined(__NetBSD__)
  42 static char sccsid[] __attribute__((unused)) = "@(#)if.c        8.1 (Berkeley) 6/5/93";
  43 #elif defined(__NetBSD__)
  44 __RCSID("$NetBSD$");
  45 #endif
  46 #ident "$FreeBSD: src/sbin/routed/parms.c,v 1.7.2.1 2000/08/14 17:00:03 sheldonh Exp $"
  47
  48
  49 struct parm *parms;
  50 struct intnet *intnets;
  51 struct r1net *r1nets;
  52 struct tgate *tgates;
  53
  54
  55 /* use configured parameters
  56  */
  57 void
  58 get_parms(struct interface *ifp)
  59 {
  60         static int warned_auth_in, warned_auth_out;
  61         struct parm *parmp;
  62         int i, num_passwds = 0;
  63
  64         /* get all relevant parameters
  65          */
  66         for (parmp = parms; parmp != 0; parmp = parmp->parm_next) {
  67                 if (parmp->parm_name[0] == '\0'
  68                     || !strcmp(ifp->int_name, parmp->parm_name)
  69                     || (parmp->parm_name[0] == '\n'
  70                         && on_net(ifp->int_addr,
  71                                   parmp->parm_net, parmp->parm_mask))) {
  72
  73                         /* This group of parameters is relevant,
  74                          * so get its settings
  75                          */
  76                         ifp->int_state |= parmp->parm_int_state;
  77                         for (i = 0; i < MAX_AUTH_KEYS; i++) {
  78                                 if (parmp->parm_auth[0].type == RIP_AUTH_NONE
  79                                     || num_passwds >= MAX_AUTH_KEYS)
  80                                         break;
  81                                 memcpy(&ifp->int_auth[num_passwds++],
  82                                        &parmp->parm_auth[i],
  83                                        sizeof(ifp->int_auth[0]));
  84                         }
  85                         if (parmp->parm_rdisc_pref != 0)
  86                                 ifp->int_rdisc_pref = parmp->parm_rdisc_pref;
  87                         if (parmp->parm_rdisc_int != 0)
  88                                 ifp->int_rdisc_int = parmp->parm_rdisc_int;
  89                         if (parmp->parm_d_metric != 0)
  90                                 ifp->int_d_metric = parmp->parm_d_metric;
  91                 }
  92         }
  93
  94         /* Set general defaults.
  95          *
  96          * Default poor-man's router discovery to a metric that will
  97          * be heard by old versions of `routed`.  They ignored received
  98          * routes with metric 15.
  99          */
 100         if ((ifp->int_state & IS_PM_RDISC)
 101             && ifp->int_d_metric == 0)
 102                 ifp->int_d_metric = FAKE_METRIC;
 103
 104         if (ifp->int_rdisc_int == 0)
 105                 ifp->int_rdisc_int = DefMaxAdvertiseInterval;
 106
 107         if (!(ifp->int_if_flags & IFF_MULTICAST)
 108             && !(ifp->int_state & IS_REMOTE))
 109                 ifp->int_state |= IS_BCAST_RDISC;
 110
 111         if (ifp->int_if_flags & IFF_POINTOPOINT) {
 112                 ifp->int_state |= IS_BCAST_RDISC;
 113                 /* By default, point-to-point links should be passive
 114                  * about router-discovery for the sake of demand-dialing.
 115                  */
 116                 if (0 == (ifp->int_state & GROUP_IS_SOL_OUT))
 117                         ifp->int_state |= IS_NO_SOL_OUT;
 118                 if (0 == (ifp->int_state & GROUP_IS_ADV_OUT))
 119                         ifp->int_state |= IS_NO_ADV_OUT;
 120         }
 121
 122         if (0 != (ifp->int_state & (IS_PASSIVE | IS_REMOTE)))
 123                 ifp->int_state |= IS_NO_RDISC;
 124         if (ifp->int_state & IS_PASSIVE)
 125                 ifp->int_state |= IS_NO_RIP;
 126
 127         if (!IS_RIP_IN_OFF(ifp->int_state)
 128             && ifp->int_auth[0].type != RIP_AUTH_NONE
 129             && !(ifp->int_state & IS_NO_RIPV1_IN)
 130             && !warned_auth_in) {
 131                 msglog("Warning: RIPv1 input via %s"
 132                        " will be accepted without authentication",
 133                        ifp->int_name);
 134                 warned_auth_in = 1;
 135         }
 136         if (!IS_RIP_OUT_OFF(ifp->int_state)
 137             && ifp->int_auth[0].type != RIP_AUTH_NONE
 138             && !(ifp->int_state & IS_NO_RIPV1_OUT)) {
 139                 if (!warned_auth_out) {
 140                         msglog("Warning: RIPv1 output via %s"
 141                                " will be sent without authentication",
 142                                ifp->int_name);
 143                         warned_auth_out = 1;
 144                 }
 145         }
 146 }
 147
 148
 149 /* Read a list of gateways from /etc/gateways and add them to our tables.
 150  *
 151  * This file contains a list of "remote" gateways.  That is usually
 152  * a gateway which we cannot immediately determine if it is present or
 153  * not as we can do for those provided by directly connected hardware.
 154  *
 155  * If a gateway is marked "passive" in the file, then we assume it
 156  * does not understand RIP and assume it is always present.  Those
 157  * not marked passive are treated as if they were directly connected
 158  * and assumed to be broken if they do not send us advertisements.
 159  * All remote interfaces are added to our list, and those not marked
 160  * passive are sent routing updates.
 161  *
 162  * A passive interface can also be local, hardware interface exempt
 163  * from RIP.
 164  */
 165 void
 166 gwkludge(void)
 167 {
 168         FILE *fp;
 169         char *p, *lptr;
 170         const char *cp;
 171         char lbuf[200], net_host[5], dname[64+1+64+1];
 172         char gname[GNAME_LEN+1], qual[9];
 173         struct interface *ifp;
 174         naddr dst, netmask, gate;
 175         int metric, n, lnum;
 176         struct stat sb;
 177         u_int state;
 178         const char *type;
 179
 180
 181         fp = fopen(_PATH_GATEWAYS, "r");
 182         if (fp == 0)
 183                 return;
 184
 185         if (0 > fstat(fileno(fp), &sb)) {
 186                 msglog("could not stat() "_PATH_GATEWAYS);
 187                 fclose(fp);
 188                 return;
 189         }
 190
 191         for (lnum = 1; ; lnum++) {
 192                 if (0 == fgets(lbuf, sizeof(lbuf), fp))
 193                         break;
 194                 lptr = lbuf;
 195                 while (*lptr == ' ')
 196                         lptr++;
 197                 p = lptr+strlen(lptr)-1;
 198                 while (*p == '\n'
 199                        || (*p == ' ' && (p == lptr+1 || *(p-1) != '\\')))
 200                         *p-- = '\0';
 201                 if (*lptr == '\0'       /* ignore null and comment lines */
 202                     || *lptr == '#')
 203                         continue;
 204
 205                 /* notice newfangled parameter lines
 206                  */
 207                 if (strncasecmp("net", lptr, 3)
 208                     && strncasecmp("host", lptr, 4)) {
 209                         cp = parse_parms(lptr,
 210                                          (sb.st_uid == 0
 211                                           && !(sb.st_mode&(S_IRWXG|S_IRWXO))));
 212                         if (cp != 0)
 213                                 msglog("%s in line %d of "_PATH_GATEWAYS,
 214                                        cp, lnum);
 215                         continue;
 216                 }
 217
 218 /*  {net | host} XX[/M] XX gateway XX metric DD [passive | external]\n */
 219                 qual[0] = '\0';
 220                 /* the '64' here must be GNAME_LEN */
 221                 n = sscanf(lptr, "%4s %129[^ \t] gateway"
 222                            " %64[^ / \t] metric %u %8s\n",
 223                            net_host, dname, gname, &metric, qual);
 224                 if (n != 4 && n != 5) {
 225                         msglog("bad "_PATH_GATEWAYS" entry \"%s\"; %d values",
 226                                lptr, n);
 227                         continue;
 228                 }
 229                 if (metric >= HOPCNT_INFINITY) {
 230                         msglog("bad metric in "_PATH_GATEWAYS" entry \"%s\"",
 231                                lptr);
 232                         continue;
 233                 }
 234                 if (!strcasecmp(net_host, "host")) {
 235                         if (!gethost(dname, &dst)) {
 236                                 msglog("bad host \"%s\" in "_PATH_GATEWAYS
 237                                        " entry \"%s\"", dname, lptr);
 238                                 continue;
 239                         }
 240                         netmask = HOST_MASK;
 241                 } else if (!strcasecmp(net_host, "net")) {
 242                         if (!getnet(dname, &dst, &netmask)) {
 243                                 msglog("bad net \"%s\" in "_PATH_GATEWAYS
 244                                        " entry \"%s\"", dname, lptr);
 245                                 continue;
 246                         }
 247                         if (dst == RIP_DEFAULT) {
 248                                 msglog("bad net \"%s\" in "_PATH_GATEWAYS
 249                                        " entry \"%s\"--cannot be default",
 250                                        dname, lptr);
 251                                 continue;
 252                         }
 253                         dst = htonl(dst); /* make network # into IP address */
 254                 } else {
 255                         msglog("bad \"%s\" in "_PATH_GATEWAYS
 256                                " entry \"%s\"", net_host, lptr);
 257                         continue;
 258                 }
 259
 260                 if (!gethost(gname, &gate)) {
 261                         msglog("bad gateway \"%s\" in "_PATH_GATEWAYS
 262                                " entry \"%s\"", gname, lptr);
 263                         continue;
 264                 }
 265
 266                 if (!strcasecmp(qual, type = "passive")) {
 267                         /* Passive entries are not placed in our tables,
 268                          * only the kernel's, so we don't copy all of the
 269                          * external routing information within a net.
 270                          * Internal machines should use the default
 271                          * route to a suitable gateway (like us).
 272                          */
 273                         state = IS_REMOTE | IS_PASSIVE;
 274                         if (metric == 0)
 275                                 metric = 1;
 276
 277                 } else if (!strcasecmp(qual, type = "external")) {
 278                         /* External entries are handled by other means
 279                          * such as EGP, and are placed only in the daemon
 280                          * tables to prevent overriding them with something
 281                          * else.
 282                          */
 283                         strcpy(qual,"external");
 284                         state = IS_REMOTE | IS_PASSIVE | IS_EXTERNAL;
 285                         if (metric == 0)
 286                                 metric = 1;
 287
 288                 } else if (!strcasecmp(qual, "active")
 289                            || qual[0] == '\0') {
 290                         if (metric != 0) {
 291                                 /* Entries that are neither "passive" nor
 292                                  * "external" are "remote" and must behave
 293                                  * like physical interfaces.  If they are not
 294                                  * heard from regularly, they are deleted.
 295                                  */
 296                                 state = IS_REMOTE;
 297                                 type = "remote";
 298                         } else {
 299                                 /* "remote" entries with a metric of 0
 300                                  * are aliases for our own interfaces
 301                                  */
 302                                 state = IS_REMOTE | IS_PASSIVE | IS_ALIAS;
 303                                 type = "alias";
 304                         }
 305
 306                 } else {
 307                         msglog("bad "_PATH_GATEWAYS" entry \"%s\";"
 308                                " unknown type %s", lptr, qual);
 309                         continue;
 310                 }
 311
 312                 if (0 != (state & (IS_PASSIVE | IS_REMOTE)))
 313                         state |= IS_NO_RDISC;
 314                 if (state & IS_PASSIVE)
 315                         state |= IS_NO_RIP;
 316
 317                 ifp = check_dup(gate,dst,netmask,0);
 318                 if (ifp != 0) {
 319                         msglog("duplicate "_PATH_GATEWAYS" entry \"%s\"",lptr);
 320                         continue;
 321                 }
 322
 323                 ifp = (struct interface *)rtmalloc(sizeof(*ifp), "gwkludge()");
 324                 memset(ifp, 0, sizeof(*ifp));
 325
 326                 ifp->int_state = state;
 327                 if (netmask == HOST_MASK)
 328                         ifp->int_if_flags = IFF_POINTOPOINT | IFF_UP;
 329                 else
 330                         ifp->int_if_flags = IFF_UP;
 331                 ifp->int_act_time = NEVER;
 332                 ifp->int_addr = gate;
 333                 ifp->int_dstaddr = dst;
 334                 ifp->int_mask = netmask;
 335                 ifp->int_ripv1_mask = netmask;
 336                 ifp->int_std_mask = std_mask(gate);
 337                 ifp->int_net = ntohl(dst);
 338                 ifp->int_std_net = ifp->int_net & ifp->int_std_mask;
 339                 ifp->int_std_addr = htonl(ifp->int_std_net);
 340                 ifp->int_metric = metric;
 341                 if (!(state & IS_EXTERNAL)
 342                     && ifp->int_mask != ifp->int_std_mask)
 343                         ifp->int_state |= IS_SUBNET;
 344                 sprintf(ifp->int_name, "%s(%s)", type, gname);
 345                 ifp->int_index = -1;
 346
 347                 if_link(ifp);
 348         }
 349
 350         /* After all of the parameter lines have been read,
 351          * apply them to any remote interfaces.
 352          */
 353         for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next) {
 354                 get_parms(ifp);
 355
 356                 tot_interfaces++;
 357                 if (!IS_RIP_OFF(ifp->int_state))
 358                         rip_interfaces++;
 359
 360                 trace_if("Add", ifp);
 361         }
 362
 363         fclose(fp);
 364 }
 365
 366
 367 /* like strtok(), but honoring backslash and not changing the source string
 368  */
 369 static int                              /* 0=ok, -1=bad */
 370 parse_quote(char **linep,               /* look here */
 371             const char *delims,         /* for these delimiters */
 372             char *delimp,               /* 0 or put found delimiter here */
 373             char *buf,                  /* copy token to here */
 374             int lim)                    /* at most this many bytes */
 375 {
 376         char c = '\0', *pc;
 377         const char *p;
 378
 379
 380         pc = *linep;
 381         if (*pc == '\0')
 382                 return -1;
 383
 384         while (lim != 0) {
 385                 c = *pc++;
 386                 if (c == '\0')
 387                         break;
 388
 389                 if (c == '\\' && *pc != '\0') {
 390                         if ((c = *pc++) == 'n') {
 391                                 c = '\n';
 392                         } else if (c == 'r') {
 393                                 c = '\r';
 394                         } else if (c == 't') {
 395                                 c = '\t';
 396                         } else if (c == 'b') {
 397                                 c = '\b';
 398                         } else if (c >= '0' && c <= '7') {
 399                                 c -= '0';
 400                                 if (*pc >= '0' && *pc <= '7') {
 401                                         c = (c<<3)+(*pc++ - '0');
 402                                         if (*pc >= '0' && *pc <= '7')
 403                                             c = (c<<3)+(*pc++ - '0');
 404                                 }
 405                         }
 406
 407                 } else {
 408                         for (p = delims; *p != '\0'; ++p) {
 409                                 if (*p == c)
 410                                         goto exit;
 411                         }
 412                 }
 413
 414                 *buf++ = c;
 415                 --lim;
 416         }
 417 exit:
 418         if (lim == 0)
 419                 return -1;
 420
 421         *buf = '\0';                    /* terminate copy of token */
 422         if (delimp != 0)
 423                 *delimp = c;            /* return delimiter */
 424         *linep = pc-1;                  /* say where we ended */
 425         return 0;
 426 }
 427
 428
 429 /* Parse password timestamp
 430  */
 431 static char *
 432 parse_ts(time_t *tp,
 433          char **valp,
 434          char *val0,
 435          char *delimp,
 436          char *buf,
 437          u_int bufsize)
 438 {
 439         struct tm tm;
 440 #if defined(sgi) || defined(__NetBSD__)
 441         char *ptr;
 442 #endif
 443
 444         if (0 > parse_quote(valp, "| ,\n\r", delimp,
 445                             buf,bufsize)
 446             || buf[bufsize-1] != '\0'
 447             || buf[bufsize-2] != '\0') {
 448                 sprintf(buf,"bad timestamp %.25s", val0);
 449                 return buf;
 450         }
 451         strcat(buf,"\n");
 452         memset(&tm, 0, sizeof(tm));
 453 #if defined(sgi) || defined(__NetBSD__)
 454         ptr = strptime(buf, "%y/%m/%d@%H:%M\n", &tm);
 455         if (ptr == NULL || *ptr != '\0') {
 456                 sprintf(buf,"bad timestamp %.25s", val0);
 457                 return buf;
 458         }
 459 #else
 460         if (5 != sscanf(buf, "%u/%u/%u@%u:%u\n",
 461                         &tm.tm_year, &tm.tm_mon, &tm.tm_mday,
 462                         &tm.tm_hour, &tm.tm_min)
 463             || tm.tm_mon < 1 || tm.tm_mon > 12
 464             || tm.tm_mday < 1 || tm.tm_mday > 31) {
 465                 sprintf(buf,"bad timestamp %.25s", val0);
 466                 return buf;
 467         }
 468         tm.tm_mon--;
 469         if (tm.tm_year <= 37)           /* assume small years are in the */
 470                 tm.tm_year += 100;      /* 3rd millenium */
 471 #endif
 472
 473         if ((*tp = mktime(&tm)) == -1) {
 474                 sprintf(buf,"bad timestamp %.25s", val0);
 475                 return buf;
 476         }
 477
 478         return 0;
 479 }
 480
 481
 482 /* Get a password, key ID, and expiration date in the format
 483  *      passwd|keyID|year/mon/day@hour:min|year/mon/day@hour:min
 484  */
 485 static const char *                     /* 0 or error message */
 486 get_passwd(char *tgt,
 487            char *val,
 488            struct parm *parmp,
 489            u_int16_t type,
 490            int safe)                    /* 1=from secure file */
 491 {
 492         static char buf[80];
 493         char *val0, *p, delim;
 494         struct auth k, *ap, *ap2;
 495         int i;
 496         u_long l;
 497
 498
 499         if (!safe)
 500                 return "ignore unsafe password";
 501
 502         for (ap = parmp->parm_auth, i = 0;
 503              ap->type != RIP_AUTH_NONE; i++, ap++) {
 504                 if (i >= MAX_AUTH_KEYS)
 505                         return "too many passwords";
 506         }
 507
 508         memset(&k, 0, sizeof(k));
 509         k.type = type;
 510         k.end = -1-DAY;
 511
 512         val0 = val;
 513         if (0 > parse_quote(&val, "| ,\n\r", &delim,
 514                             (char *)k.key, sizeof(k.key)))
 515                 return tgt;
 516
 517         if (delim != '|') {
 518                 if (type == RIP_AUTH_MD5)
 519                         return "missing Keyid";
 520         } else {
 521                 val0 = ++val;
 522                 buf[sizeof(buf)-1] = '\0';
 523                 if (0 > parse_quote(&val, "| ,\n\r", &delim, buf,sizeof(buf))
 524                     || buf[sizeof(buf)-1] != '\0'
 525                     || (l = strtoul(buf,&p,0)) > 255
 526                     || *p != '\0') {
 527                         sprintf(buf,"bad KeyID \"%.20s\"", val0);
 528                         return buf;
 529                 }
 530                 for (ap2 = parmp->parm_auth; ap2 < ap; ap2++) {
 531                         if (ap2->keyid == l) {
 532                                 sprintf(buf,"duplicate KeyID \"%.20s\"", val0);
 533                                 return buf;
 534                         }
 535                 }
 536                 k.keyid = (int)l;
 537
 538                 if (delim == '|') {
 539                         val0 = ++val;
 540                         if (0 != (p = parse_ts(&k.start,&val,val0,&delim,
 541                                                buf,sizeof(buf))))
 542                                 return p;
 543                         if (delim != '|')
 544                                 return "missing second timestamp";
 545                         val0 = ++val;
 546                         if (0 != (p = parse_ts(&k.end,&val,val0,&delim,
 547                                                buf,sizeof(buf))))
 548                                 return p;
 549                         if ((u_long)k.start > (u_long)k.end) {
 550                                 sprintf(buf,"out of order timestamp %.30s",
 551                                         val0);
 552                                 return buf;
 553                         }
 554                 }
 555         }
 556         if (delim != '\0')
 557                 return tgt;
 558
 559         memmove(ap, &k, sizeof(*ap));
 560         return 0;
 561 }
 562
 563
 564 static const char *
 565 bad_str(const char *estr)
 566 {
 567         static char buf[100+8];
 568
 569         sprintf(buf, "bad \"%.100s\"", estr);
 570         return buf;
 571 }
 572
 573
 574 /* Parse a set of parameters for an interface.
 575  */
 576 const char *                                    /* 0 or error message */
 577 parse_parms(char *line,
 578             int safe)                   /* 1=from secure file */
 579 {
 580 #define PARS(str) (!strcasecmp(tgt, str))
 581 #define PARSEQ(str) (!strncasecmp(tgt, str"=", sizeof(str)))
 582 #define CKF(g,b) {if (0 != (parm.parm_int_state & ((g) & ~(b)))) break; \
 583         parm.parm_int_state |= (b);}
 584         struct parm parm;
 585         struct intnet *intnetp;
 586         struct r1net *r1netp;
 587         struct tgate *tg;
 588         naddr addr, mask;
 589         char delim, *val0 = 0, *tgt, *val, *p;
 590         const char *msg;
 591         char buf[BUFSIZ], buf2[BUFSIZ];
 592         int i;
 593
 594
 595         /* "subnet=x.y.z.u/mask[,metric]" must be alone on the line */
 596         if (!strncasecmp(line, "subnet=", sizeof("subnet=")-1)
 597             && *(val = &line[sizeof("subnet=")-1]) != '\0') {
 598                 if (0 > parse_quote(&val, ",", &delim, buf, sizeof(buf)))
 599                         return bad_str(line);
 600                 intnetp = (struct intnet*)rtmalloc(sizeof(*intnetp),
 601                                                    "parse_parms subnet");
 602                 intnetp->intnet_metric = 1;
 603                 if (delim == ',') {
 604                         intnetp->intnet_metric = (int)strtol(val+1,&p,0);
 605                         if (*p != '\0'
 606                             || intnetp->intnet_metric <= 0
 607                             || intnetp->intnet_metric >= HOPCNT_INFINITY)
 608                                 return bad_str(line);
 609                 }
 610                 if (!getnet(buf, &intnetp->intnet_addr, &intnetp->intnet_mask)
 611                     || intnetp->intnet_mask == HOST_MASK
 612                     || intnetp->intnet_addr == RIP_DEFAULT) {
 613                         free(intnetp);
 614                         return bad_str(line);
 615                 }
 616                 intnetp->intnet_addr = htonl(intnetp->intnet_addr);
 617                 intnetp->intnet_next = intnets;
 618                 intnets = intnetp;
 619                 return 0;
 620         }
 621
 622         /* "ripv1_mask=x.y.z.u/mask1,mask2" must be alone on the line.
 623          * This requires that x.y.z.u/mask1 be considered a subnet of
 624          * x.y.z.u/mask2, as if x.y.z.u/mask2 were a class-full network.
 625          */
 626         if (!strncasecmp(line, "ripv1_mask=", sizeof("ripv1_mask=")-1)
 627             && *(val = &line[sizeof("ripv1_mask=")-1]) != '\0') {
 628                 if (0 > parse_quote(&val, ",", &delim, buf, sizeof(buf))
 629                     || delim == '\0')
 630                         return bad_str(line);
 631                 if ((i = (int)strtol(val+1, &p, 0)) <= 0
 632                     || i > 32 || *p != '\0')
 633                         return bad_str(line);
 634                 r1netp = (struct r1net *)rtmalloc(sizeof(*r1netp),
 635                                                   "parse_parms ripv1_mask");
 636                 r1netp->r1net_mask = HOST_MASK << (32-i);
 637                 if (!getnet(buf, &r1netp->r1net_net, &r1netp->r1net_match)
 638                     || r1netp->r1net_net == RIP_DEFAULT
 639                     || r1netp->r1net_mask > r1netp->r1net_match) {
 640                         free(r1netp);
 641                         return bad_str(line);
 642                 }
 643                 r1netp->r1net_next = r1nets;
 644                 r1nets = r1netp;
 645                 return 0;
 646         }
 647
 648         memset(&parm, 0, sizeof(parm));
 649
 650         for (;;) {
 651                 tgt = line + strspn(line, " ,\n\r");
 652                 if (*tgt == '\0' || *tgt == '#')
 653                         break;
 654                 line = tgt+strcspn(tgt, "= #,\n\r");
 655                 delim = *line;
 656                 if (delim == '=') {
 657                         val0 = ++line;
 658                         if (0 > parse_quote(&line, " #,\n\r",&delim,
 659                                             buf,sizeof(buf)))
 660                                 return bad_str(tgt);
 661                 }
 662                 if (delim != '\0') {
 663                         for (;;) {
 664                                 *line = '\0';
 665                                 if (delim == '#')
 666                                         break;
 667                                 ++line;
 668                                 if (delim != ' '
 669                                     || (delim = *line) != ' ')
 670                                         break;
 671                         }
 672                 }
 673
 674                 if (PARSEQ("if")) {
 675                         if (parm.parm_name[0] != '\0'
 676                             || strlen(buf) > IF_NAME_LEN)
 677                                 return bad_str(tgt);
 678                         strcpy(parm.parm_name, buf);
 679
 680                 } else if (PARSEQ("addr")) {
 681                         /* This is a bad idea, because the address based
 682                          * sets of parameters cannot be checked for
 683                          * consistency with the interface name parameters.
 684                          * The parm_net stuff is needed to allow several
 685                          * -F settings.
 686                          */
 687                         if (!getnet(val0, &addr, &mask)
 688                             || parm.parm_name[0] != '\0')
 689                                 return bad_str(tgt);
 690                         parm.parm_net = addr;
 691                         parm.parm_mask = mask;
 692                         parm.parm_name[0] = '\n';
 693
 694                 } else if (PARSEQ("passwd")) {
 695                         /* since cleartext passwords are so weak allow
 696                          * them anywhere
 697                          */
 698                         msg = get_passwd(tgt,val0,&parm,RIP_AUTH_PW,1);
 699                         if (msg) {
 700                                 *val0 = '\0';
 701                                 return bad_str(msg);
 702                         }
 703
 704                 } else if (PARSEQ("md5_passwd")) {
 705                         msg = get_passwd(tgt,val0,&parm,RIP_AUTH_MD5,safe);
 706                         if (msg) {
 707                                 *val0 = '\0';
 708                                 return bad_str(msg);
 709                         }
 710
 711                 } else if (PARS("no_ag")) {
 712                         parm.parm_int_state |= (IS_NO_AG | IS_NO_SUPER_AG);
 713
 714                 } else if (PARS("no_super_ag")) {
 715                         parm.parm_int_state |= IS_NO_SUPER_AG;
 716
 717                 } else if (PARS("no_ripv1_in")) {
 718                         parm.parm_int_state |= IS_NO_RIPV1_IN;
 719
 720                 } else if (PARS("no_ripv2_in")) {
 721                         parm.parm_int_state |= IS_NO_RIPV2_IN;
 722
 723                 } else if (PARS("ripv2_out")) {
 724                         if (parm.parm_int_state & IS_NO_RIPV2_OUT)
 725                                 return bad_str(tgt);
 726                         parm.parm_int_state |= IS_NO_RIPV1_OUT;
 727
 728                 } else if (PARS("ripv2")) {
 729                         if ((parm.parm_int_state & IS_NO_RIPV2_OUT)
 730                             || (parm.parm_int_state & IS_NO_RIPV2_IN))
 731                                 return bad_str(tgt);
 732                         parm.parm_int_state |= (IS_NO_RIPV1_IN
 733                                                 | IS_NO_RIPV1_OUT);
 734
 735                 } else if (PARS("no_rip")) {
 736                         CKF(IS_PM_RDISC, IS_NO_RIP);
 737
 738                 } else if (PARS("no_rip_mcast")) {
 739                         parm.parm_int_state |= IS_NO_RIP_MCAST;
 740
 741                 } else if (PARS("no_rdisc")) {
 742                         CKF((GROUP_IS_SOL_OUT|GROUP_IS_ADV_OUT), IS_NO_RDISC);
 743
 744                 } else if (PARS("no_solicit")) {
 745                         CKF(GROUP_IS_SOL_OUT, IS_NO_SOL_OUT);
 746
 747                 } else if (PARS("send_solicit")) {
 748                         CKF(GROUP_IS_SOL_OUT, IS_SOL_OUT);
 749
 750                 } else if (PARS("no_rdisc_adv")) {
 751                         CKF(GROUP_IS_ADV_OUT, IS_NO_ADV_OUT);
 752
 753                 } else if (PARS("rdisc_adv")) {
 754                         CKF(GROUP_IS_ADV_OUT, IS_ADV_OUT);
 755
 756                 } else if (PARS("bcast_rdisc")) {
 757                         parm.parm_int_state |= IS_BCAST_RDISC;
 758
 759                 } else if (PARS("passive")) {
 760                         CKF((GROUP_IS_SOL_OUT|GROUP_IS_ADV_OUT), IS_NO_RDISC);
 761                         parm.parm_int_state |= IS_NO_RIP| IS_PASSIVE;
 762
 763                 } else if (PARSEQ("rdisc_pref")) {
 764                         if (parm.parm_rdisc_pref != 0
 765                             || (parm.parm_rdisc_pref = (int)strtol(buf,&p,0),
 766                                 *p != '\0'))
 767                                 return bad_str(tgt);
 768
 769                 } else if (PARS("pm_rdisc")) {
 770                         if (IS_RIP_OUT_OFF(parm.parm_int_state))
 771                                 return bad_str(tgt);
 772                         parm.parm_int_state |= IS_PM_RDISC;
 773
 774                 } else if (PARSEQ("rdisc_interval")) {
 775                         if (parm.parm_rdisc_int != 0
 776                             || (parm.parm_rdisc_int = (int)strtoul(buf,&p,0),
 777                                 *p != '\0')
 778                             || parm.parm_rdisc_int < MinMaxAdvertiseInterval
 779                             || parm.parm_rdisc_int > MaxMaxAdvertiseInterval)
 780                                 return bad_str(tgt);
 781
 782                 } else if (PARSEQ("fake_default")) {
 783                         if (parm.parm_d_metric != 0
 784                             || IS_RIP_OUT_OFF(parm.parm_int_state)
 785                             || (parm.parm_d_metric = (int)strtoul(buf,&p,0),
 786                                 *p != '\0')
 787                             || parm.parm_d_metric > HOPCNT_INFINITY-1)
 788                                 return bad_str(tgt);
 789
 790                 } else if (PARSEQ("trust_gateway")) {
 791                         /* look for trust_gateway=x.y.z|net/mask|...) */
 792                         p = buf;
 793                         if (0 > parse_quote(&p, "|", &delim,
 794                                             buf2, sizeof(buf2))
 795                             || !gethost(buf2,&addr))
 796                                 return bad_str(tgt);
 797                         tg = (struct tgate *)rtmalloc(sizeof(*tg),
 798                                                       "parse_parms"
 799                                                       "trust_gateway");
 800                         memset(tg, 0, sizeof(*tg));
 801                         tg->tgate_addr = addr;
 802                         i = 0;
 803                         /* The default is to trust all routes. */
 804                         while (delim == '|') {
 805                                 p++;
 806                                 if (i >= MAX_TGATE_NETS
 807                                     || 0 > parse_quote(&p, "|", &delim,
 808                                                        buf2, sizeof(buf2))
 809                                     || !getnet(buf2, &tg->tgate_nets[i].net,
 810                                                &tg->tgate_nets[i].mask)
 811                                     || tg->tgate_nets[i].net == RIP_DEFAULT
 812                                     || tg->tgate_nets[i].mask == 0)
 813                                         return bad_str(tgt);
 814                                 i++;
 815                         }
 816                         tg->tgate_next = tgates;
 817                         tgates = tg;
 818                         parm.parm_int_state |= IS_DISTRUST;
 819
 820                 } else if (PARS("redirect_ok")) {
 821                         parm.parm_int_state |= IS_REDIRECT_OK;
 822
 823                 } else {
 824                         return bad_str(tgt);    /* error */
 825                 }
 826         }
 827
 828         return check_parms(&parm);
 829 #undef PARS
 830 #undef PARSEQ
 831 }
 832
 833
 834 /* check for duplicate parameter specifications */
 835 const char *                            /* 0 or error message */
 836 check_parms(struct parm *new)
 837 {
 838         struct parm *parmp, **parmpp;
 839         int i, num_passwds;
 840
 841         /* set implicit values
 842          */
 843         if (new->parm_int_state & IS_NO_ADV_IN)
 844                 new->parm_int_state |= IS_NO_SOL_OUT;
 845         if (new->parm_int_state & IS_NO_SOL_OUT)
 846                 new->parm_int_state |= IS_NO_ADV_IN;
 847
 848         for (i = num_passwds = 0; i < MAX_AUTH_KEYS; i++) {
 849                 if (new->parm_auth[i].type != RIP_AUTH_NONE)
 850                         num_passwds++;
 851         }
 852
 853         /* compare with existing sets of parameters
 854          */
 855         for (parmpp = &parms;
 856              (parmp = *parmpp) != 0;
 857              parmpp = &parmp->parm_next) {
 858                 if (strcmp(new->parm_name, parmp->parm_name))
 859                         continue;
 860                 if (!on_net(htonl(parmp->parm_net),
 861                             new->parm_net, new->parm_mask)
 862                     && !on_net(htonl(new->parm_net),
 863                                parmp->parm_net, parmp->parm_mask))
 864                         continue;
 865
 866                 for (i = 0; i < MAX_AUTH_KEYS; i++) {
 867                         if (parmp->parm_auth[i].type != RIP_AUTH_NONE)
 868                                 num_passwds++;
 869                 }
 870                 if (num_passwds > MAX_AUTH_KEYS)
 871                         return "too many conflicting passwords";
 872
 873                 if ((0 != (new->parm_int_state & GROUP_IS_SOL_OUT)
 874                      && 0 != (parmp->parm_int_state & GROUP_IS_SOL_OUT)
 875                      && 0 != ((new->parm_int_state ^ parmp->parm_int_state)
 876                               && GROUP_IS_SOL_OUT))
 877                     || (0 != (new->parm_int_state & GROUP_IS_ADV_OUT)
 878                         && 0 != (parmp->parm_int_state & GROUP_IS_ADV_OUT)
 879                         && 0 != ((new->parm_int_state ^ parmp->parm_int_state)
 880                                  && GROUP_IS_ADV_OUT))
 881                     || (new->parm_rdisc_pref != 0
 882                         && parmp->parm_rdisc_pref != 0
 883                         && new->parm_rdisc_pref != parmp->parm_rdisc_pref)
 884                     || (new->parm_rdisc_int != 0
 885                         && parmp->parm_rdisc_int != 0
 886                         && new->parm_rdisc_int != parmp->parm_rdisc_int)) {
 887                         return ("conflicting, duplicate router discovery"
 888                                 " parameters");
 889
 890                 }
 891
 892                 if (new->parm_d_metric != 0
 893                      && parmp->parm_d_metric != 0
 894                      && new->parm_d_metric != parmp->parm_d_metric) {
 895                         return ("conflicting, duplicate poor man's router"
 896                                 " discovery or fake default metric");
 897                 }
 898         }
 899
 900         /* link new entry on the so that when the entries are scanned,
 901          * they affect the result in the order the operator specified.
 902          */
 903         parmp = (struct parm*)rtmalloc(sizeof(*parmp), "check_parms");
 904         memcpy(parmp, new, sizeof(*parmp));
 905         *parmpp = parmp;
 906
 907         return 0;
 908 }
 909
 910
 911 /* get a network number as a name or a number, with an optional "/xx"
 912  * netmask.
 913  */
 914 int                                     /* 0=bad */
 915 getnet(char *name,
 916        naddr *netp,                     /* network in host byte order */
 917        naddr *maskp)                    /* masks are always in host order */
 918 {
 919         int i;
 920         struct netent *np;
 921         naddr mask;                     /* in host byte order */
 922         struct in_addr in;              /* a network and so host byte order */
 923         char hname[MAXHOSTNAMELEN+1];
 924         char *mname, *p;
 925
 926
 927         /* Detect and separate "1.2.3.4/24"
 928          */
 929         if (0 != (mname = strrchr(name,'/'))) {
 930                 i = (int)(mname - name);
 931                 if (i > (int)sizeof(hname)-1)   /* name too long */
 932                         return 0;
 933                 memmove(hname, name, i);
 934                 hname[i] = '\0';
 935                 mname++;
 936                 name = hname;
 937         }
 938
 939         np = getnetbyname(name);
 940         if (np != 0) {
 941                 in.s_addr = (naddr)np->n_net;
 942                 if (0 == (in.s_addr & 0xff000000))
 943                         in.s_addr <<= 8;
 944                 if (0 == (in.s_addr & 0xff000000))
 945                         in.s_addr <<= 8;
 946                 if (0 == (in.s_addr & 0xff000000))
 947                         in.s_addr <<= 8;
 948         } else if (inet_aton(name, &in) == 1) {
 949                 in.s_addr = ntohl(in.s_addr);
 950         } else if (!mname && !strcasecmp(name,"default")) {
 951                 in.s_addr = RIP_DEFAULT;
 952         } else {
 953                 return 0;
 954         }
 955
 956         if (!mname) {
 957                 /* we cannot use the interfaces here because we have not
 958                  * looked at them yet.
 959                  */
 960                 mask = std_mask(htonl(in.s_addr));
 961                 if ((~mask & in.s_addr) != 0)
 962                         mask = HOST_MASK;
 963         } else {
 964                 mask = (naddr)strtoul(mname, &p, 0);
 965                 if (*p != '\0' || mask > 32)
 966                         return 0;
 967                 if (mask != 0)
 968                         mask = HOST_MASK << (32-mask);
 969         }
 970
 971         /* must have mask of 0 with default */
 972         if (mask != 0 && in.s_addr == RIP_DEFAULT)
 973                 return 0;
 974         /* no host bits allowed in a network number */
 975         if ((~mask & in.s_addr) != 0)
 976                 return 0;
 977         /* require non-zero network number */
 978         if ((mask & in.s_addr) == 0 && in.s_addr != RIP_DEFAULT)
 979                 return 0;
 980         if (in.s_addr>>24 == 0 && in.s_addr != RIP_DEFAULT)
 981                 return 0;
 982         if (in.s_addr>>24 == 0xff)
 983                 return 0;
 984
 985         *netp = in.s_addr;
 986         *maskp = mask;
 987         return 1;
 988 }
 989
 990
 991 int                                     /* 0=bad */
 992 gethost(char *name,
 993         naddr *addrp)
 994 {
 995         struct hostent *hp;
 996         struct in_addr in;
 997
 998
 999         /* Try for a number first, even in IRIX where gethostbyname()
1000          * is smart.  This avoids hitting the name server which
1001          * might be sick because routing is.
1002          */
1003         if (inet_aton(name, &in) == 1) {
1004                 /* get a good number, but check that it it makes some
1005                  * sense.
1006                  */
1007                 if (ntohl(in.s_addr)>>24 == 0
1008                     || ntohl(in.s_addr)>>24 == 0xff)
1009                         return 0;
1010                 *addrp = in.s_addr;
1011                 return 1;
1012         }
1013
1014         hp = gethostbyname(name);
1015         if (hp) {
1016                 memcpy(addrp, hp->h_addr, sizeof(*addrp));
1017                 return 1;
1018         }
1019
1020         return 0;
1021 }