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