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  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * $FreeBSD$
  30  */
  31
  32 #include "defs.h"
  33 #include "pathnames.h"
  34 #include <sys/stat.h>
  35
  36 #ifdef __NetBSD__
  37 __RCSID("$NetBSD$");
  38 #elif defined(__FreeBSD__)
  39 __RCSID("$FreeBSD$");
  40 #else
  41 __RCSID("$Revision: 2.26 $");
  42 #ident "$Revision: 2.26 $"
  43 #endif
  44
  45
  46 static struct parm *parms;
  47 struct intnet *intnets;
  48 struct r1net *r1nets;
  49 struct tgate *tgates;
  50
  51
  52 /* use configured parameters
  53  */
  54 void
  55 get_parms(struct interface *ifp)
  56 {
  57         static int warned_auth_in, warned_auth_out;
  58         struct parm *parmp;
  59         int i, num_passwds = 0;
  60
  61         /* get all relevant parameters
  62          */
  63         for (parmp = parms; parmp != 0; parmp = parmp->parm_next) {
  64                 if (parmp->parm_name[0] == '\0'
  65                     || !strcmp(ifp->int_name, parmp->parm_name)
  66                     || (parmp->parm_name[0] == '\n'
  67                         && on_net(ifp->int_addr,
  68                                   parmp->parm_net, parmp->parm_mask))) {
  69
  70                         /* This group of parameters is relevant,
  71                          * so get its settings
  72                          */
  73                         ifp->int_state |= parmp->parm_int_state;
  74                         for (i = 0; i < MAX_AUTH_KEYS; i++) {
  75                                 if (parmp->parm_auth[0].type == RIP_AUTH_NONE
  76                                     || num_passwds >= MAX_AUTH_KEYS)
  77                                         break;
  78                                 memcpy(&ifp->int_auth[num_passwds++],
  79                                        &parmp->parm_auth[i],
  80                                        sizeof(ifp->int_auth[0]));
  81                         }
  82                         if (parmp->parm_rdisc_pref != 0)
  83                                 ifp->int_rdisc_pref = parmp->parm_rdisc_pref;
  84                         if (parmp->parm_rdisc_int != 0)
  85                                 ifp->int_rdisc_int = parmp->parm_rdisc_int;
  86                         if (parmp->parm_adj_inmetric != 0)
  87                             ifp->int_adj_inmetric = parmp->parm_adj_inmetric;
  88                         if (parmp->parm_adj_outmetric != 0)
  89                             ifp->int_adj_outmetric = parmp->parm_adj_outmetric;
  90                 }
  91         }
  92
  93         /* Set general defaults.
  94          *
  95          * Default poor-man's router discovery to a metric that will
  96          * be heard by old versions of `routed`.  They ignored received
  97          * routes with metric 15.
  98          */
  99         if ((ifp->int_state & IS_PM_RDISC)
 100             && ifp->int_d_metric == 0)
 101                 ifp->int_d_metric = FAKE_METRIC;
 102
 103         if (ifp->int_rdisc_int == 0)
 104                 ifp->int_rdisc_int = DefMaxAdvertiseInterval;
 105
 106         if (!(ifp->int_if_flags & IFF_MULTICAST)
 107             && !(ifp->int_state & IS_REMOTE))
 108                 ifp->int_state |= IS_BCAST_RDISC;
 109
 110         if (ifp->int_if_flags & IFF_POINTOPOINT) {
 111                 ifp->int_state |= IS_BCAST_RDISC;
 112                 /* By default, point-to-point links should be passive
 113                  * about router-discovery for the sake of demand-dialing.
 114                  */
 115                 if (0 == (ifp->int_state & GROUP_IS_SOL_OUT))
 116                         ifp->int_state |= IS_NO_SOL_OUT;
 117                 if (0 == (ifp->int_state & GROUP_IS_ADV_OUT))
 118                         ifp->int_state |= IS_NO_ADV_OUT;
 119         }
 120
 121         if (0 != (ifp->int_state & (IS_PASSIVE | IS_REMOTE)))
 122                 ifp->int_state |= IS_NO_RDISC;
 123         if (ifp->int_state & IS_PASSIVE)
 124                 ifp->int_state |= IS_NO_RIP;
 125
 126         if (!IS_RIP_IN_OFF(ifp->int_state)
 127             && ifp->int_auth[0].type != RIP_AUTH_NONE
 128             && !(ifp->int_state & IS_NO_RIPV1_IN)
 129             && !warned_auth_in) {
 130                 msglog("Warning: RIPv1 input via %s"
 131                        " will be accepted without authentication",
 132                        ifp->int_name);
 133                 warned_auth_in = 1;
 134         }
 135         if (!IS_RIP_OUT_OFF(ifp->int_state)
 136             && ifp->int_auth[0].type != RIP_AUTH_NONE
 137             && !(ifp->int_state & IS_NO_RIPV1_OUT)) {
 138                 if (!warned_auth_out) {
 139                         msglog("Warning: RIPv1 output via %s"
 140                                " will be sent without authentication",
 141                                ifp->int_name);
 142                         warned_auth_out = 1;
 143                 }
 144         }
 145 }
 146
 147
 148 /* Read a list of gateways from /etc/gateways and add them to our tables.
 149  *
 150  * This file contains a list of "remote" gateways.  That is usually
 151  * a gateway which we cannot immediately determine if it is present or
 152  * not as we can do for those provided by directly connected hardware.
 153  *
 154  * If a gateway is marked "passive" in the file, then we assume it
 155  * does not understand RIP and assume it is always present.  Those
 156  * not marked passive are treated as if they were directly connected
 157  * and assumed to be broken if they do not send us advertisements.
 158  * All remote interfaces are added to our list, and those not marked
 159  * passive are sent routing updates.
 160  *
 161  * A passive interface can also be local, hardware interface exempt
 162  * from RIP.
 163  */
 164 void
 165 gwkludge(void)
 166 {
 167         FILE *fp;
 168         char *p, *lptr;
 169         const char *cp;
 170         char lbuf[200], net_host[5], dname[64+1+64+1];
 171         char gname[GNAME_LEN+1], qual[9];
 172         struct interface *ifp;
 173         naddr dst, netmask, gate;
 174         int metric, n, lnum;
 175         struct stat sb;
 176         u_int state;
 177         const char *type;
 178
 179
 180         fp = fopen(_PATH_GATEWAYS, "r");
 181         if (fp == 0)
 182                 return;
 183
 184         if (0 > fstat(fileno(fp), &sb)) {
 185                 msglog("could not stat() "_PATH_GATEWAYS);
 186                 (void)fclose(fp);
 187                 return;
 188         }
 189
 190         for (lnum = 1; ; lnum++) {
 191                 if (fgets(lbuf, sizeof(lbuf), fp) == NULL)
 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                         /* Turn network # into IP address. */
 253                         dst = htonl(dst);
 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,state);
 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                 (void)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         LIST_FOREACH(ifp, &ifnet, int_list) {
 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         (void)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         char *ptr;
 441
 442         if (0 > parse_quote(valp, "| ,\n\r", delimp,
 443                             buf,bufsize)
 444             || buf[bufsize-1] != '\0'
 445             || buf[bufsize-2] != '\0') {
 446                 sprintf(buf,"bad timestamp %.25s", val0);
 447                 return buf;
 448         }
 449         strcat(buf,"\n");
 450         memset(&tm, 0, sizeof(tm));
 451         ptr = strptime(buf, "%y/%m/%d@%H:%M\n", &tm);
 452         if (ptr == NULL || *ptr != '\0') {
 453                 sprintf(buf,"bad timestamp %.25s", val0);
 454                 return buf;
 455         }
 456
 457         if ((*tp = mktime(&tm)) == -1) {
 458                 sprintf(buf,"bad timestamp %.25s", val0);
 459                 return buf;
 460         }
 461
 462         return 0;
 463 }
 464
 465
 466 /* Get a password, key ID, and expiration date in the format
 467  *      passwd|keyID|year/mon/day@hour:min|year/mon/day@hour:min
 468  */
 469 static const char *                     /* 0 or error message */
 470 get_passwd(char *tgt,
 471            char *val,
 472            struct parm *parmp,
 473            u_int16_t type,
 474            int safe)                    /* 1=from secure file */
 475 {
 476         static char buf[80];
 477         char *val0, *p, delim;
 478         struct auth k, *ap, *ap2;
 479         int i;
 480         u_long l;
 481
 482         assert(val != NULL);
 483         if (!safe)
 484                 return "ignore unsafe password";
 485
 486         for (ap = parmp->parm_auth, i = 0;
 487              ap->type != RIP_AUTH_NONE; i++, ap++) {
 488                 if (i >= MAX_AUTH_KEYS)
 489                         return "too many passwords";
 490         }
 491
 492         memset(&k, 0, sizeof(k));
 493         k.type = type;
 494         k.end = -1-DAY;
 495
 496         val0 = val;
 497         if (0 > parse_quote(&val, "| ,\n\r", &delim,
 498                             (char *)k.key, sizeof(k.key)))
 499                 return tgt;
 500
 501         if (delim != '|') {
 502                 if (type == RIP_AUTH_MD5)
 503                         return "missing Keyid";
 504         } else {
 505                 val0 = ++val;
 506                 buf[sizeof(buf)-1] = '\0';
 507                 if (0 > parse_quote(&val, "| ,\n\r", &delim, buf,sizeof(buf))
 508                     || buf[sizeof(buf)-1] != '\0'
 509                     || (l = strtoul(buf,&p,0)) > 255
 510                     || *p != '\0') {
 511                         sprintf(buf,"bad KeyID \"%.20s\"", val0);
 512                         return buf;
 513                 }
 514                 for (ap2 = parmp->parm_auth; ap2 < ap; ap2++) {
 515                         if (ap2->keyid == l) {
 516                                 sprintf(buf,"duplicate KeyID \"%.20s\"", val0);
 517                                 return buf;
 518                         }
 519                 }
 520                 k.keyid = (int)l;
 521
 522                 if (delim == '|') {
 523                         val0 = ++val;
 524                         if (0 != (p = parse_ts(&k.start,&val,val0,&delim,
 525                                                buf,sizeof(buf))))
 526                                 return p;
 527                         if (delim != '|')
 528                                 return "missing second timestamp";
 529                         val0 = ++val;
 530                         if (0 != (p = parse_ts(&k.end,&val,val0,&delim,
 531                                                buf,sizeof(buf))))
 532                                 return p;
 533                         if ((u_long)k.start > (u_long)k.end) {
 534                                 sprintf(buf,"out of order timestamp %.30s",
 535                                         val0);
 536                                 return buf;
 537                         }
 538                 }
 539         }
 540         if (delim != '\0')
 541                 return tgt;
 542
 543         memmove(ap, &k, sizeof(*ap));
 544         return 0;
 545 }
 546
 547
 548 static const char *
 549 bad_str(const char *estr)
 550 {
 551         static char buf[100+8];
 552
 553         sprintf(buf, "bad \"%.100s\"", estr);
 554         return buf;
 555 }
 556
 557
 558 /* Parse a set of parameters for an interface.
 559  */
 560 const char *                                    /* 0 or error message */
 561 parse_parms(char *line,
 562             int safe)                   /* 1=from secure file */
 563 {
 564 #define PARS(str) (!strcasecmp(tgt, str))
 565 #define PARSEQ(str) (!strncasecmp(tgt, str"=", sizeof(str)))
 566 #define CKF(g,b) {if (0 != (parm.parm_int_state & ((g) & ~(b)))) break; \
 567         parm.parm_int_state |= (b);}
 568         struct parm parm;
 569         struct intnet *intnetp;
 570         struct r1net *r1netp;
 571         struct tgate *tg;
 572         naddr addr, mask;
 573         char delim, *val0 = 0, *tgt, *val, *p;
 574         const char *msg;
 575         char buf[BUFSIZ], buf2[BUFSIZ];
 576         int i;
 577
 578
 579         /* "subnet=x.y.z.u/mask[,metric]" must be alone on the line */
 580         if (!strncasecmp(line, "subnet=", sizeof("subnet=")-1)
 581             && *(val = &line[sizeof("subnet=")-1]) != '\0') {
 582                 if (0 > parse_quote(&val, ",", &delim, buf, sizeof(buf)))
 583                         return bad_str(line);
 584                 intnetp = (struct intnet*)rtmalloc(sizeof(*intnetp),
 585                                                    "parse_parms subnet");
 586                 intnetp->intnet_metric = 1;
 587                 if (delim == ',') {
 588                         intnetp->intnet_metric = (int)strtol(val+1,&p,0);
 589                         if (*p != '\0'
 590                             || intnetp->intnet_metric <= 0
 591                             || intnetp->intnet_metric >= HOPCNT_INFINITY)
 592                                 return bad_str(line);
 593                 }
 594                 if (!getnet(buf, &intnetp->intnet_addr, &intnetp->intnet_mask)
 595                     || intnetp->intnet_mask == HOST_MASK
 596                     || intnetp->intnet_addr == RIP_DEFAULT) {
 597                         free(intnetp);
 598                         return bad_str(line);
 599                 }
 600                 intnetp->intnet_addr = htonl(intnetp->intnet_addr);
 601                 intnetp->intnet_next = intnets;
 602                 intnets = intnetp;
 603                 return 0;
 604         }
 605
 606         /* "ripv1_mask=x.y.z.u/mask1,mask2" must be alone on the line.
 607          * This requires that x.y.z.u/mask1 be considered a subnet of
 608          * x.y.z.u/mask2, as if x.y.z.u/mask2 were a class-full network.
 609          */
 610         if (!strncasecmp(line, "ripv1_mask=", sizeof("ripv1_mask=")-1)
 611             && *(val = &line[sizeof("ripv1_mask=")-1]) != '\0') {
 612                 if (0 > parse_quote(&val, ",", &delim, buf, sizeof(buf))
 613                     || delim == '\0')
 614                         return bad_str(line);
 615                 if ((i = (int)strtol(val+1, &p, 0)) <= 0
 616                     || i > 32 || *p != '\0')
 617                         return bad_str(line);
 618                 r1netp = (struct r1net *)rtmalloc(sizeof(*r1netp),
 619                                                   "parse_parms ripv1_mask");
 620                 r1netp->r1net_mask = HOST_MASK << (32-i);
 621                 if (!getnet(buf, &r1netp->r1net_net, &r1netp->r1net_match)
 622                     || r1netp->r1net_net == RIP_DEFAULT
 623                     || r1netp->r1net_mask > r1netp->r1net_match) {
 624                         free(r1netp);
 625                         return bad_str(line);
 626                 }
 627                 r1netp->r1net_next = r1nets;
 628                 r1nets = r1netp;
 629                 return 0;
 630         }
 631
 632         memset(&parm, 0, sizeof(parm));
 633
 634         for (;;) {
 635                 tgt = line + strspn(line, " ,\n\r");
 636                 if (*tgt == '\0' || *tgt == '#')
 637                         break;
 638                 line = tgt+strcspn(tgt, "= #,\n\r");
 639                 delim = *line;
 640                 if (delim == '=') {
 641                         val0 = ++line;
 642                         if (0 > parse_quote(&line, " #,\n\r",&delim,
 643                                             buf,sizeof(buf)))
 644                                 return bad_str(tgt);
 645                 } else {
 646                         val0 = NULL;
 647                 }
 648                 if (delim != '\0') {
 649                         for (;;) {
 650                                 *line = '\0';
 651                                 if (delim == '#')
 652                                         break;
 653                                 ++line;
 654                                 if (delim != ' '
 655                                     || (delim = *line) != ' ')
 656                                         break;
 657                         }
 658                 }
 659
 660                 if (PARSEQ("if")) {
 661                         if (parm.parm_name[0] != '\0'
 662                             || strlen(buf) > IF_NAME_LEN)
 663                                 return bad_str(tgt);
 664                         strcpy(parm.parm_name, buf);
 665
 666                 } else if (PARSEQ("addr")) {
 667                         /* This is a bad idea, because the address based
 668                          * sets of parameters cannot be checked for
 669                          * consistency with the interface name parameters.
 670                          * The parm_net stuff is needed to allow several
 671                          * -F settings.
 672                          */
 673                         if (!getnet(val0, &addr, &mask)
 674                             || parm.parm_name[0] != '\0')
 675                                 return bad_str(tgt);
 676                         parm.parm_net = addr;
 677                         parm.parm_mask = mask;
 678                         parm.parm_name[0] = '\n';
 679
 680                 } else if (PARSEQ("passwd")) {
 681                         /* since cleartext passwords are so weak allow
 682                          * them anywhere
 683                          */
 684                         msg = get_passwd(tgt,val0,&parm,RIP_AUTH_PW,1);
 685                         if (msg) {
 686                                 *val0 = '\0';
 687                                 return bad_str(msg);
 688                         }
 689
 690                 } else if (PARSEQ("md5_passwd")) {
 691                         msg = get_passwd(tgt,val0,&parm,RIP_AUTH_MD5,safe);
 692                         if (msg) {
 693                                 *val0 = '\0';
 694                                 return bad_str(msg);
 695                         }
 696
 697                 } else if (PARS("no_ag")) {
 698                         parm.parm_int_state |= (IS_NO_AG | IS_NO_SUPER_AG);
 699
 700                 } else if (PARS("no_super_ag")) {
 701                         parm.parm_int_state |= IS_NO_SUPER_AG;
 702
 703                 } else if (PARS("no_rip_out")) {
 704                         parm.parm_int_state |= IS_NO_RIP_OUT;
 705
 706                 } else if (PARS("no_ripv1_in")) {
 707                         parm.parm_int_state |= IS_NO_RIPV1_IN;
 708
 709                 } else if (PARS("no_ripv2_in")) {
 710                         parm.parm_int_state |= IS_NO_RIPV2_IN;
 711
 712                 } else if (PARS("ripv2_out")) {
 713                         if (parm.parm_int_state & IS_NO_RIPV2_OUT)
 714                                 return bad_str(tgt);
 715                         parm.parm_int_state |= IS_NO_RIPV1_OUT;
 716
 717                 } else if (PARS("ripv2")) {
 718                         if ((parm.parm_int_state & IS_NO_RIPV2_OUT)
 719                             || (parm.parm_int_state & IS_NO_RIPV2_IN))
 720                                 return bad_str(tgt);
 721                         parm.parm_int_state |= (IS_NO_RIPV1_IN
 722                                                 | IS_NO_RIPV1_OUT);
 723
 724                 } else if (PARS("no_rip")) {
 725                         CKF(IS_PM_RDISC, IS_NO_RIP);
 726
 727                 } else if (PARS("no_rip_mcast")) {
 728                         parm.parm_int_state |= IS_NO_RIP_MCAST;
 729
 730                 } else if (PARS("no_rdisc")) {
 731                         CKF((GROUP_IS_SOL_OUT|GROUP_IS_ADV_OUT), IS_NO_RDISC);
 732
 733                 } else if (PARS("no_solicit")) {
 734                         CKF(GROUP_IS_SOL_OUT, IS_NO_SOL_OUT);
 735
 736                 } else if (PARS("send_solicit")) {
 737                         CKF(GROUP_IS_SOL_OUT, IS_SOL_OUT);
 738
 739                 } else if (PARS("no_rdisc_adv")) {
 740                         CKF(GROUP_IS_ADV_OUT, IS_NO_ADV_OUT);
 741
 742                 } else if (PARS("rdisc_adv")) {
 743                         CKF(GROUP_IS_ADV_OUT, IS_ADV_OUT);
 744
 745                 } else if (PARS("bcast_rdisc")) {
 746                         parm.parm_int_state |= IS_BCAST_RDISC;
 747
 748                 } else if (PARS("passive")) {
 749                         CKF((GROUP_IS_SOL_OUT|GROUP_IS_ADV_OUT), IS_NO_RDISC);
 750                         parm.parm_int_state |= IS_NO_RIP | IS_PASSIVE;
 751
 752                 } else if (PARSEQ("rdisc_pref")) {
 753                         if (parm.parm_rdisc_pref != 0
 754                             || (parm.parm_rdisc_pref = (int)strtol(buf,&p,0),
 755                                 *p != '\0'))
 756                                 return bad_str(tgt);
 757
 758                 } else if (PARS("pm_rdisc")) {
 759                         if (IS_RIP_OUT_OFF(parm.parm_int_state))
 760                                 return bad_str(tgt);
 761                         parm.parm_int_state |= IS_PM_RDISC;
 762
 763                 } else if (PARSEQ("rdisc_interval")) {
 764                         if (parm.parm_rdisc_int != 0
 765                             || (parm.parm_rdisc_int = (int)strtoul(buf,&p,0),
 766                                 *p != '\0')
 767                             || parm.parm_rdisc_int < MinMaxAdvertiseInterval
 768                             || parm.parm_rdisc_int > MaxMaxAdvertiseInterval)
 769                                 return bad_str(tgt);
 770
 771                 } else if (PARSEQ("fake_default")) {
 772                         if (parm.parm_d_metric != 0
 773                             || IS_RIP_OUT_OFF(parm.parm_int_state)
 774                             || (i = strtoul(buf,&p,0), *p != '\0')
 775                             || i > HOPCNT_INFINITY-1)
 776                                 return bad_str(tgt);
 777                         parm.parm_d_metric = i;
 778
 779                 } else if (PARSEQ("adj_inmetric")) {
 780                         if (parm.parm_adj_inmetric != 0
 781                             || (i = strtoul(buf,&p,0), *p != '\0')
 782                             || i > HOPCNT_INFINITY-1)
 783                                 return bad_str(tgt);
 784                         parm.parm_adj_inmetric = i;
 785
 786                 } else if (PARSEQ("adj_outmetric")) {
 787                         if (parm.parm_adj_outmetric != 0
 788                             || (i = strtoul(buf,&p,0), *p != '\0')
 789                             || i > HOPCNT_INFINITY-1)
 790                                 return bad_str(tgt);
 791                         parm.parm_adj_outmetric = i;
 792
 793                 } else if (PARSEQ("trust_gateway")) {
 794                         /* look for trust_gateway=x.y.z|net/mask|...) */
 795                         p = buf;
 796                         if (0 > parse_quote(&p, "|", &delim,
 797                                             buf2, sizeof(buf2))
 798                             || !gethost(buf2,&addr))
 799                                 return bad_str(tgt);
 800                         tg = (struct tgate *)rtmalloc(sizeof(*tg),
 801                                                       "parse_parms"
 802                                                       "trust_gateway");
 803                         memset(tg, 0, sizeof(*tg));
 804                         tg->tgate_addr = addr;
 805                         i = 0;
 806                         /* The default is to trust all routes. */
 807                         while (delim == '|') {
 808                                 p++;
 809                                 if (i >= MAX_TGATE_NETS
 810                                     || 0 > parse_quote(&p, "|", &delim,
 811                                                        buf2, sizeof(buf2))
 812                                     || !getnet(buf2, &tg->tgate_nets[i].net,
 813                                                &tg->tgate_nets[i].mask)
 814                                     || tg->tgate_nets[i].net == RIP_DEFAULT
 815                                     || tg->tgate_nets[i].mask == 0)
 816                                         return bad_str(tgt);
 817                                 i++;
 818                         }
 819                         tg->tgate_next = tgates;
 820                         tgates = tg;
 821                         parm.parm_int_state |= IS_DISTRUST;
 822
 823                 } else if (PARS("redirect_ok")) {
 824                         parm.parm_int_state |= IS_REDIRECT_OK;
 825
 826                 } else {
 827                         return bad_str(tgt);    /* error */
 828                 }
 829         }
 830
 831         return check_parms(&parm);
 832 #undef PARS
 833 #undef PARSEQ
 834 }
 835
 836
 837 /* check for duplicate parameter specifications */
 838 const char *                            /* 0 or error message */
 839 check_parms(struct parm *new)
 840 {
 841         struct parm *parmp, **parmpp;
 842         int i, num_passwds;
 843
 844         /* set implicit values
 845          */
 846         if (new->parm_int_state & IS_NO_ADV_IN)
 847                 new->parm_int_state |= IS_NO_SOL_OUT;
 848         if (new->parm_int_state & IS_NO_SOL_OUT)
 849                 new->parm_int_state |= IS_NO_ADV_IN;
 850
 851         for (i = num_passwds = 0; i < MAX_AUTH_KEYS; i++) {
 852                 if (new->parm_auth[i].type != RIP_AUTH_NONE)
 853                         num_passwds++;
 854         }
 855
 856         /* compare with existing sets of parameters
 857          */
 858         for (parmpp = &parms;
 859              (parmp = *parmpp) != 0;
 860              parmpp = &parmp->parm_next) {
 861                 if (strcmp(new->parm_name, parmp->parm_name))
 862                         continue;
 863                 if (!on_net(htonl(parmp->parm_net),
 864                             new->parm_net, new->parm_mask)
 865                     && !on_net(htonl(new->parm_net),
 866                                parmp->parm_net, parmp->parm_mask))
 867                         continue;
 868
 869                 for (i = 0; i < MAX_AUTH_KEYS; i++) {
 870                         if (parmp->parm_auth[i].type != RIP_AUTH_NONE)
 871                                 num_passwds++;
 872                 }
 873                 if (num_passwds > MAX_AUTH_KEYS)
 874                         return "too many conflicting passwords";
 875
 876                 if ((0 != (new->parm_int_state & GROUP_IS_SOL_OUT)
 877                      && 0 != (parmp->parm_int_state & GROUP_IS_SOL_OUT)
 878                      && 0 != ((new->parm_int_state ^ parmp->parm_int_state)
 879                               & GROUP_IS_SOL_OUT))
 880                     || (0 != (new->parm_int_state & GROUP_IS_ADV_OUT)
 881                         && 0 != (parmp->parm_int_state & GROUP_IS_ADV_OUT)
 882                         && 0 != ((new->parm_int_state ^ parmp->parm_int_state)
 883                                  & GROUP_IS_ADV_OUT))
 884                     || (new->parm_rdisc_pref != 0
 885                         && parmp->parm_rdisc_pref != 0
 886                         && new->parm_rdisc_pref != parmp->parm_rdisc_pref)
 887                     || (new->parm_rdisc_int != 0
 888                         && parmp->parm_rdisc_int != 0
 889                         && new->parm_rdisc_int != parmp->parm_rdisc_int)) {
 890                         return ("conflicting, duplicate router discovery"
 891                                 " parameters");
 892
 893                 }
 894
 895                 if (new->parm_d_metric != 0
 896                      && parmp->parm_d_metric != 0
 897                      && new->parm_d_metric != parmp->parm_d_metric) {
 898                         return ("conflicting, duplicate poor man's router"
 899                                 " discovery or fake default metric");
 900                 }
 901
 902                 if (new->parm_adj_inmetric != 0
 903                     && parmp->parm_adj_inmetric != 0
 904                     && new->parm_adj_inmetric != parmp->parm_adj_inmetric) {
 905                         return ("conflicting interface input "
 906                                 "metric adjustments");
 907                 }
 908
 909                 if (new->parm_adj_outmetric != 0
 910                     && parmp->parm_adj_outmetric != 0
 911                     && new->parm_adj_outmetric != parmp->parm_adj_outmetric) {
 912                         return ("conflicting interface output "
 913                                 "metric adjustments");
 914                 }
 915         }
 916
 917         /* link new entry on the list so that when the entries are scanned,
 918          * they affect the result in the order the operator specified.
 919          */
 920         parmp = (struct parm*)rtmalloc(sizeof(*parmp), "check_parms");
 921         memcpy(parmp, new, sizeof(*parmp));
 922         *parmpp = parmp;
 923
 924         return 0;
 925 }
 926
 927
 928 /* get a network number as a name or a number, with an optional "/xx"
 929  * netmask.
 930  */
 931 int                                     /* 0=bad */
 932 getnet(char *name,
 933        naddr *netp,                     /* network in host byte order */
 934        naddr *maskp)                    /* masks are always in host order */
 935 {
 936         int i;
 937         struct netent *np;
 938         naddr mask;                     /* in host byte order */
 939         struct in_addr in;              /* a network and so host byte order */
 940         char hname[MAXHOSTNAMELEN+1];
 941         char *mname, *p;
 942
 943
 944         /* Detect and separate "1.2.3.4/24"
 945          */
 946         if (0 != (mname = strrchr(name,'/'))) {
 947                 i = (int)(mname - name);
 948                 if (i > (int)sizeof(hname)-1)   /* name too long */
 949                         return 0;
 950                 memmove(hname, name, i);
 951                 hname[i] = '\0';
 952                 mname++;
 953                 name = hname;
 954         }
 955
 956         np = getnetbyname(name);
 957         if (np != 0) {
 958                 in.s_addr = (naddr)np->n_net;
 959                 if (0 == (in.s_addr & 0xff000000))
 960                         in.s_addr <<= 8;
 961                 if (0 == (in.s_addr & 0xff000000))
 962                         in.s_addr <<= 8;
 963                 if (0 == (in.s_addr & 0xff000000))
 964                         in.s_addr <<= 8;
 965         } else if (inet_aton(name, &in) == 1) {
 966                 in.s_addr = ntohl(in.s_addr);
 967         } else if (!mname && !strcasecmp(name,"default")) {
 968                 in.s_addr = RIP_DEFAULT;
 969         } else {
 970                 return 0;
 971         }
 972
 973         if (!mname) {
 974                 /* we cannot use the interfaces here because we have not
 975                  * looked at them yet.
 976                  */
 977                 mask = std_mask(htonl(in.s_addr));
 978                 if ((~mask & in.s_addr) != 0)
 979                         mask = HOST_MASK;
 980         } else {
 981                 mask = (naddr)strtoul(mname, &p, 0);
 982                 if (*p != '\0' || mask > 32)
 983                         return 0;
 984                 if (mask != 0)
 985                         mask = HOST_MASK << (32-mask);
 986         }
 987
 988         /* must have mask of 0 with default */
 989         if (mask != 0 && in.s_addr == RIP_DEFAULT)
 990                 return 0;
 991         /* no host bits allowed in a network number */
 992         if ((~mask & in.s_addr) != 0)
 993                 return 0;
 994         /* require non-zero network number */
 995         if ((mask & in.s_addr) == 0 && in.s_addr != RIP_DEFAULT)
 996                 return 0;
 997         if (in.s_addr>>24 == 0 && in.s_addr != RIP_DEFAULT)
 998                 return 0;
 999         if (in.s_addr>>24 == 0xff)
1000                 return 0;
1001
1002         *netp = in.s_addr;
1003         *maskp = mask;
1004         return 1;
1005 }
1006
1007
1008 int                                     /* 0=bad */
1009 gethost(char *name,
1010         naddr *addrp)
1011 {
1012         struct hostent *hp;
1013         struct in_addr in;
1014
1015
1016         /* Try for a number first, even in IRIX where gethostbyname()
1017          * is smart.  This avoids hitting the name server which
1018          * might be sick because routing is.
1019          */
1020         if (inet_aton(name, &in) == 1) {
1021                 /* get a good number, but check that it it makes some
1022                  * sense.
1023                  */
1024                 if (ntohl(in.s_addr)>>24 == 0
1025                     || ntohl(in.s_addr)>>24 == 0xff)
1026                         return 0;
1027                 *addrp = in.s_addr;
1028                 return 1;
1029         }
1030
1031         hp = gethostbyname(name);
1032         if (hp) {
1033                 memcpy(addrp, hp->h_addr, sizeof(*addrp));
1034                 return 1;
1035         }
1036
1037         return 0;
1038 }