sbin/routed/rtquery/rtquery.c

   1 /*-
   2  * Copyright (c) 1982, 1986, 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/rtquery/rtquery.c,v 1.13 1999/08/28 00:14:21 peter Exp $
  34  */
  35
  36 char copyright[] =
  37 "@(#) Copyright (c) 1982, 1986, 1993\n\
  38         The Regents of the University of California.  All rights reserved.\n";
  39
  40 #include <sys/cdefs.h>
  41 #include <sys/param.h>
  42 #include <sys/protosw.h>
  43 #include <sys/socket.h>
  44 #include <sys/time.h>
  45 #include <netinet/in.h>
  46 #define RIPVERSION RIPv2
  47 #include <protocols/routed.h>
  48 #include <arpa/inet.h>
  49 #include <netdb.h>
  50 #include <errno.h>
  51 #include <unistd.h>
  52 #include <stdio.h>
  53 #include <stdlib.h>
  54 #include <string.h>
  55 #ifdef sgi
  56 #include <strings.h>
  57 #include <bstring.h>
  58 #endif
  59
  60 #if !defined(sgi) && !defined(__NetBSD__)
  61 static char sccsid[] __attribute__((unused))= "@(#)query.c      8.1 (Berkeley) 6/5/93";
  62 #elif defined(__NetBSD__)
  63 __RCSID("$NetBSD: rtquery.c,v 1.10 1999/02/23 10:47:41 christos Exp $");
  64 #endif
  65
  66 #ifndef sgi
  67 #define _HAVE_SIN_LEN
  68 #endif
  69
  70 #define MD5_DIGEST_LEN 16
  71 typedef struct {
  72         u_int32_t state[4];             /* state (ABCD) */
  73         u_int32_t count[2];             /* # of bits, modulo 2^64 (LSB 1st) */
  74         unsigned char buffer[64];       /* input buffer */
  75 } MD5_CTX;
  76 extern void MD5Init(MD5_CTX*);
  77 extern void MD5Update(MD5_CTX*, u_char*, u_int);
  78 extern void MD5Final(u_char[MD5_DIGEST_LEN], MD5_CTX*);
  79
  80
  81 #define WTIME   15              /* Time to wait for all responses */
  82 #define STIME   (250*1000)      /* usec to wait for another response */
  83
  84 int     soc;
  85
  86 const char *pgmname;
  87
  88 union {
  89         struct rip rip;
  90         char    packet[MAXPACKETSIZE+MAXPATHLEN];
  91 } omsg_buf;
  92 #define OMSG omsg_buf.rip
  93 int omsg_len = sizeof(struct rip);
  94
  95 union {
  96         struct  rip rip;
  97         char    packet[MAXPACKETSIZE+1024];
  98         } imsg_buf;
  99 #define IMSG imsg_buf.rip
 100
 101 int     nflag;                          /* numbers, no names */
 102 int     pflag;                          /* play the `gated` game */
 103 int     ripv2 = 1;                      /* use RIP version 2 */
 104 int     wtime = WTIME;
 105 int     rflag;                          /* 1=ask about a particular route */
 106 int     trace, not_trace;               /* send trace command or not */
 107 int     auth_type = RIP_AUTH_NONE;
 108 char    passwd[RIP_AUTH_PW_LEN];
 109 u_long  keyid;
 110
 111 struct timeval sent;                    /* when query sent */
 112
 113 static char localhost_str[] = "localhost";
 114 static char *default_argv[] = {localhost_str, 0};
 115
 116 static void rip_input(struct sockaddr_in*, int);
 117 static int out(const char *);
 118 static void trace_loop(char *argv[]) __attribute((__noreturn__));
 119 static void query_loop(char *argv[], int) __attribute((__noreturn__));
 120 static int getnet(char *, struct netinfo *);
 121 static u_int std_mask(u_int);
 122 static int parse_quote(char **, const char *, char *, char *, int);
 123 static void usage(void);
 124
 125
 126 int
 127 main(int argc,
 128      char *argv[])
 129 {
 130         int ch, bsize;
 131         char *p, *options, *value, delim;
 132         const char *result;
 133
 134         OMSG.rip_nets[0].n_dst = RIP_DEFAULT;
 135         OMSG.rip_nets[0].n_family = RIP_AF_UNSPEC;
 136         OMSG.rip_nets[0].n_metric = htonl(HOPCNT_INFINITY);
 137
 138         pgmname = argv[0];
 139         delim = 0;
 140         while ((ch = getopt(argc, argv, "np1w:r:t:a:")) != -1)
 141                 switch (ch) {
 142                 case 'n':
 143                         not_trace = 1;
 144                         nflag = 1;
 145                         break;
 146
 147                 case 'p':
 148                         not_trace = 1;
 149                         pflag = 1;
 150                         break;
 151
 152                 case '1':
 153                         ripv2 = 0;
 154                         break;
 155
 156                 case 'w':
 157                         not_trace = 1;
 158                         wtime = (int)strtoul(optarg, &p, 0);
 159                         if (*p != '\0'
 160                             || wtime <= 0)
 161                                 usage();
 162                         break;
 163
 164                 case 'r':
 165                         not_trace = 1;
 166                         if (rflag)
 167                                 usage();
 168                         rflag = getnet(optarg, &OMSG.rip_nets[0]);
 169                         if (!rflag) {
 170                                 struct hostent *hp = gethostbyname(optarg);
 171                                 if (hp == NULL) {
 172                                         fprintf(stderr, "%s: %s:",
 173                                                 pgmname, optarg);
 174                                         herror(0);
 175                                         exit(1);
 176                                 }
 177                                 memcpy(&OMSG.rip_nets[0].n_dst, hp->h_addr,
 178                                        sizeof(OMSG.rip_nets[0].n_dst));
 179                                 OMSG.rip_nets[0].n_family = RIP_AF_INET;
 180                                 OMSG.rip_nets[0].n_mask = -1;
 181                                 rflag = 1;
 182                         }
 183                         break;
 184
 185                 case 't':
 186                         trace = 1;
 187                         options = optarg;
 188                         while (*options != '\0') {
 189                                 /* messy complications to make -W -Wall happy */
 190                                 static char on_str[] = "on";
 191                                 static char more_str[] = "more";
 192                                 static char off_str[] = "off";
 193                                 static char dump_str[] = "dump";
 194                                 static char *traceopts[] = {
 195 #                                   define TRACE_ON     0
 196                                         on_str,
 197 #                                   define TRACE_MORE   1
 198                                         more_str,
 199 #                                   define TRACE_OFF    2
 200                                         off_str,
 201 #                                   define TRACE_DUMP   3
 202                                         dump_str,
 203                                         0
 204                                 };
 205                                 result = "";
 206                                 switch (getsubopt(&options,traceopts,&value)) {
 207                                 case TRACE_ON:
 208                                         OMSG.rip_cmd = RIPCMD_TRACEON;
 209                                         if (!value
 210                                             || strlen(value) > MAXPATHLEN)
 211                                             usage();
 212                                         result = value;
 213                                         break;
 214                                 case TRACE_MORE:
 215                                         if (value)
 216                                             usage();
 217                                         OMSG.rip_cmd = RIPCMD_TRACEON;
 218                                         break;
 219                                 case TRACE_OFF:
 220                                         if (value)
 221                                             usage();
 222                                         OMSG.rip_cmd = RIPCMD_TRACEOFF;
 223                                         break;
 224                                 case TRACE_DUMP:
 225                                         if (value)
 226                                             usage();
 227                                         OMSG.rip_cmd = RIPCMD_TRACEON;
 228                                         result = "dump/../table";
 229                                         break;
 230                                 default:
 231                                         usage();
 232                                 }
 233                                 strcpy((char*)OMSG.rip_tracefile, result);
 234                                 omsg_len += strlen(result) - sizeof(OMSG.ripun);
 235                         }
 236                         break;
 237
 238                 case 'a':
 239                         not_trace = 1;
 240                         p = strchr(optarg,'=');
 241                         if (!p)
 242                                 usage();
 243                         *p++ = '\0';
 244                         if (!strcasecmp("passwd",optarg))
 245                                 auth_type = RIP_AUTH_PW;
 246                         else if (!strcasecmp("md5_passwd",optarg))
 247                                 auth_type = RIP_AUTH_MD5;
 248                         else
 249                                 usage();
 250                         if (0 > parse_quote(&p,"|",&delim,
 251                                             passwd, sizeof(passwd)))
 252                                 usage();
 253                         if (auth_type == RIP_AUTH_MD5
 254                             && delim == '|') {
 255                                 keyid = strtoul(p+1,&p,0);
 256                                 if (keyid > 255 || *p != '\0')
 257                                         usage();
 258                         } else if (delim != '\0') {
 259                                 usage();
 260                         }
 261                         break;
 262
 263                 default:
 264                         usage();
 265         }
 266         argv += optind;
 267         argc -= optind;
 268         if (not_trace && trace)
 269                 usage();
 270         if (argc == 0) {
 271                 argc = 1;
 272                 argv = default_argv;
 273         }
 274
 275         soc = socket(AF_INET, SOCK_DGRAM, 0);
 276         if (soc < 0) {
 277                 perror("socket");
 278                 exit(2);
 279         }
 280
 281         /* be prepared to receive a lot of routes */
 282         for (bsize = 127*1024; ; bsize -= 1024) {
 283                 if (setsockopt(soc, SOL_SOCKET, SO_RCVBUF,
 284                                &bsize, sizeof(bsize)) == 0)
 285                         break;
 286                 if (bsize <= 4*1024) {
 287                         perror("setsockopt SO_RCVBUF");
 288                         break;
 289                 }
 290         }
 291
 292         if (trace)
 293                 trace_loop(argv);
 294         else
 295                 query_loop(argv, argc);
 296         /* NOTREACHED */
 297         return 0;
 298 }
 299
 300
 301 static void
 302 usage(void)
 303 {
 304         fprintf(stderr,
 305                 "usage:  rtquery [-np1] [-r tgt_rt] [-w wtime]"
 306                 " [-a type=passwd] host1 [host2 ...]\n"
 307                 "\trtquery -t {on=filename|more|off|dump}"
 308                                 " host1 [host2 ...]\n");
 309         exit(1);
 310 }
 311
 312
 313 /* tell the target hosts about tracing
 314  */
 315 static void
 316 trace_loop(char *argv[])
 317 {
 318         struct sockaddr_in myaddr;
 319         int res;
 320
 321         if (geteuid() != 0) {
 322                 fprintf(stderr, "-t requires UID 0\n");
 323                 exit(1);
 324         }
 325
 326         if (ripv2) {
 327                 OMSG.rip_vers = RIPv2;
 328         } else {
 329                 OMSG.rip_vers = RIPv1;
 330         }
 331
 332         memset(&myaddr, 0, sizeof(myaddr));
 333         myaddr.sin_family = AF_INET;
 334 #ifdef _HAVE_SIN_LEN
 335         myaddr.sin_len = sizeof(myaddr);
 336 #endif
 337         myaddr.sin_port = htons(IPPORT_RESERVED-1);
 338         while (bind(soc, (struct sockaddr *)&myaddr, sizeof(myaddr)) < 0) {
 339                 if (errno != EADDRINUSE
 340                     || myaddr.sin_port == 0) {
 341                         perror("bind");
 342                         exit(2);
 343                 }
 344                 myaddr.sin_port = htons(ntohs(myaddr.sin_port)-1);
 345         }
 346
 347         res = 1;
 348         while (*argv != NULL) {
 349                 if (out(*argv++) <= 0)
 350                         res = 0;
 351         }
 352         exit(res);
 353 }
 354
 355
 356 /* query all of the listed hosts
 357  */
 358 static void
 359 query_loop(char *argv[], int argc)
 360 {
 361 #       define NA0 (OMSG.rip_auths[0])
 362 #       define NA2 (OMSG.rip_auths[2])
 363         struct seen {
 364                 struct seen *next;
 365                 struct in_addr addr;
 366         } *seen, *sp;
 367         int answered = 0;
 368         int cc;
 369         fd_set bits;
 370         struct timeval now, delay;
 371         struct sockaddr_in from;
 372         socklen_t fromlen;
 373         MD5_CTX md5_ctx;
 374
 375
 376         OMSG.rip_cmd = (pflag) ? RIPCMD_POLL : RIPCMD_REQUEST;
 377         if (ripv2) {
 378                 OMSG.rip_vers = RIPv2;
 379                 if (auth_type == RIP_AUTH_PW) {
 380                         OMSG.rip_nets[1] = OMSG.rip_nets[0];
 381                         NA0.a_family = RIP_AF_AUTH;
 382                         NA0.a_type = RIP_AUTH_PW;
 383                         memcpy(NA0.au.au_pw, passwd, RIP_AUTH_PW_LEN);
 384                         omsg_len += sizeof(OMSG.rip_nets[0]);
 385
 386                 } else if (auth_type == RIP_AUTH_MD5) {
 387                         OMSG.rip_nets[1] = OMSG.rip_nets[0];
 388                         NA0.a_family = RIP_AF_AUTH;
 389                         NA0.a_type = RIP_AUTH_MD5;
 390                         NA0.au.a_md5.md5_keyid = (int8_t)keyid;
 391                         NA0.au.a_md5.md5_auth_len = RIP_AUTH_MD5_LEN;
 392                         NA0.au.a_md5.md5_seqno = 0;
 393                         cc = (char *)&NA2-(char *)&OMSG;
 394                         NA0.au.a_md5.md5_pkt_len = htons(cc);
 395                         NA2.a_family = RIP_AF_AUTH;
 396                         NA2.a_type = htons(1);
 397                         MD5Init(&md5_ctx);
 398                         MD5Update(&md5_ctx,
 399                                   (u_char *)&OMSG, cc);
 400                         MD5Update(&md5_ctx,
 401                                   (u_char *)passwd, RIP_AUTH_MD5_LEN);
 402                         MD5Final(NA2.au.au_pw, &md5_ctx);
 403                         omsg_len += 2*sizeof(OMSG.rip_nets[0]);
 404                 }
 405
 406         } else {
 407                 OMSG.rip_vers = RIPv1;
 408                 OMSG.rip_nets[0].n_mask = 0;
 409         }
 410
 411         /* ask the first (valid) host */
 412         seen = NULL;
 413         while (0 > out(*argv++)) {
 414                 if (*argv == NULL)
 415                         exit(-1);
 416                 answered++;
 417         }
 418
 419         FD_ZERO(&bits);
 420         for (;;) {
 421                 FD_SET(soc, &bits);
 422                 delay.tv_sec = 0;
 423                 delay.tv_usec = STIME;
 424                 cc = select(soc+1, &bits, 0,0, &delay);
 425                 if (cc > 0) {
 426                         fromlen = sizeof(from);
 427                         cc = recvfrom(soc, imsg_buf.packet,
 428                                       sizeof(imsg_buf.packet), 0,
 429                                       (struct sockaddr *)&from, &fromlen);
 430                         if (cc < 0) {
 431                                 perror("recvfrom");
 432                                 exit(1);
 433                         }
 434                         /* count the distinct responding hosts.
 435                          * You cannot match responding hosts with
 436                          * addresses to which queries were transmitted,
 437                          * because a router might respond with a
 438                          * different source address.
 439                          */
 440                         for (sp = seen; sp != NULL; sp = sp->next) {
 441                                 if (sp->addr.s_addr == from.sin_addr.s_addr)
 442                                         break;
 443                         }
 444                         if (sp == NULL) {
 445                                 sp = malloc(sizeof(*sp));
 446                                 if (sp == NULL) {
 447                                         fprintf(stderr,
 448                                                 "rtquery: malloc failed\n");
 449                                         exit(1);
 450                                 }
 451                                 sp->addr = from.sin_addr;
 452                                 sp->next = seen;
 453                                 seen = sp;
 454                                 answered++;
 455                         }
 456
 457                         rip_input(&from, cc);
 458                         continue;
 459                 }
 460
 461                 if (cc < 0) {
 462                         if (errno == EINTR)
 463                                 continue;
 464                         perror("select");
 465                         exit(1);
 466                 }
 467
 468                 /* After a pause in responses, probe another host.
 469                  * This reduces the intermingling of answers.
 470                  */
 471                 while (*argv != NULL && 0 > out(*argv++))
 472                         answered++;
 473
 474                 /* continue until no more packets arrive
 475                  * or we have heard from all hosts
 476                  */
 477                 if (answered >= argc)
 478                         break;
 479
 480                 /* or until we have waited a long time
 481                  */
 482                 if (gettimeofday(&now, 0) < 0) {
 483                         perror("gettimeofday(now)");
 484                         exit(1);
 485                 }
 486                 if (sent.tv_sec + wtime <= now.tv_sec)
 487                         break;
 488         }
 489
 490         /* fail if there was no answer */
 491         exit (answered >= argc ? 0 : 1);
 492 }
 493
 494
 495 /* send to one host
 496  */
 497 static int
 498 out(const char *host)
 499 {
 500         struct sockaddr_in router;
 501         struct hostent *hp;
 502
 503         if (gettimeofday(&sent, 0) < 0) {
 504                 perror("gettimeofday(sent)");
 505                 return -1;
 506         }
 507
 508         memset(&router, 0, sizeof(router));
 509         router.sin_family = AF_INET;
 510 #ifdef _HAVE_SIN_LEN
 511         router.sin_len = sizeof(router);
 512 #endif
 513         if (!inet_aton(host, &router.sin_addr)) {
 514                 hp = gethostbyname(host);
 515                 if (hp == NULL) {
 516                         herror(host);
 517                         return -1;
 518                 }
 519                 memcpy(&router.sin_addr, hp->h_addr, sizeof(router.sin_addr));
 520         }
 521         router.sin_port = htons(RIP_PORT);
 522
 523         if (sendto(soc, &omsg_buf, omsg_len, 0,
 524                    (struct sockaddr *)&router, sizeof(router)) < 0) {
 525                 perror(host);
 526                 return -1;
 527         }
 528
 529         return 0;
 530 }
 531
 532
 533 /*
 534  * Convert string to printable characters
 535  */
 536 static char *
 537 qstring(u_char *s, int len)
 538 {
 539         static char buf[8*20+1];
 540         char *p;
 541         u_char *s2, c;
 542
 543
 544         for (p = buf; len != 0 && p < &buf[sizeof(buf)-1]; len--) {
 545                 c = *s++;
 546                 if (c == '\0') {
 547                         for (s2 = s+1; s2 < &s[len]; s2++) {
 548                                 if (*s2 != '\0')
 549                                         break;
 550                         }
 551                         if (s2 >= &s[len])
 552                             goto exit;
 553                 }
 554
 555                 if (c >= ' ' && c < 0x7f && c != '\\') {
 556                         *p++ = c;
 557                         continue;
 558                 }
 559                 *p++ = '\\';
 560                 switch (c) {
 561                 case '\\':
 562                         *p++ = '\\';
 563                         break;
 564                 case '\n':
 565                         *p++= 'n';
 566                         break;
 567                 case '\r':
 568                         *p++= 'r';
 569                         break;
 570                 case '\t':
 571                         *p++ = 't';
 572                         break;
 573                 case '\b':
 574                         *p++ = 'b';
 575                         break;
 576                 default:
 577                         p += sprintf(p,"%o",c);
 578                         break;
 579                 }
 580         }
 581 exit:
 582         *p = '\0';
 583         return buf;
 584 }
 585
 586
 587 /*
 588  * Handle an incoming RIP packet.
 589  */
 590 static void
 591 rip_input(struct sockaddr_in *from,
 592           int size)
 593 {
 594         struct netinfo *n, *lim;
 595         struct in_addr in;
 596         const char *name;
 597         char net_buf[80];
 598         u_char hash[RIP_AUTH_MD5_LEN];
 599         MD5_CTX md5_ctx;
 600         u_char md5_authed = 0;
 601         u_int mask, dmask;
 602         char *sp;
 603         int i;
 604         struct hostent *hp;
 605         struct netent *np;
 606         struct netauth *na;
 607
 608
 609         if (nflag) {
 610                 printf("%s:", inet_ntoa(from->sin_addr));
 611         } else {
 612                 hp = gethostbyaddr(&from->sin_addr, sizeof(struct in_addr),
 613                                    AF_INET);
 614                 if (hp == NULL) {
 615                         printf("%s:",
 616                                inet_ntoa(from->sin_addr));
 617                 } else {
 618                         printf("%s (%s):", hp->h_name,
 619                                inet_ntoa(from->sin_addr));
 620                 }
 621         }
 622         if (IMSG.rip_cmd != RIPCMD_RESPONSE) {
 623                 printf("\n    unexpected response type %d\n", IMSG.rip_cmd);
 624                 return;
 625         }
 626         printf(" RIPv%d%s %d bytes\n", IMSG.rip_vers,
 627                (IMSG.rip_vers != RIPv1 && IMSG.rip_vers != RIPv2) ? " ?" : "",
 628                size);
 629         if (size > MAXPACKETSIZE) {
 630                 if (size > (int)sizeof(imsg_buf) - (int)sizeof(*n)) {
 631                         printf("       at least %d bytes too long\n",
 632                                size-MAXPACKETSIZE);
 633                         size = (int)sizeof(imsg_buf) - (int)sizeof(*n);
 634                 } else {
 635                         printf("       %d bytes too long\n",
 636                                size-MAXPACKETSIZE);
 637                 }
 638         } else if (size%sizeof(*n) != sizeof(struct rip)%sizeof(*n)) {
 639                 printf("    response of bad length=%d\n", size);
 640         }
 641
 642         n = IMSG.rip_nets;
 643         lim = (struct netinfo *)((char*)n + size) - 1;
 644         for (; n <= lim; n++) {
 645                 name = "";
 646                 if (n->n_family == RIP_AF_INET) {
 647                         in.s_addr = n->n_dst;
 648                         strcpy(net_buf, inet_ntoa(in));
 649
 650                         mask = ntohl(n->n_mask);
 651                         dmask = mask & -mask;
 652                         if (mask != 0) {
 653                                 sp = &net_buf[strlen(net_buf)];
 654                                 if (IMSG.rip_vers == RIPv1) {
 655                                         sprintf(sp," mask=%#x ? ",mask);
 656                                         mask = 0;
 657                                 } else if (mask + dmask == 0) {
 658                                         for (i = 0;
 659                                              (i != 32
 660                                               && ((1<<i)&mask) == 0);
 661                                              i++)
 662                                                 continue;
 663                                         sprintf(sp, "/%d",32-i);
 664                                 } else {
 665                                         sprintf(sp," (mask %#x)", mask);
 666                                 }
 667                         }
 668
 669                         if (!nflag) {
 670                                 if (mask == 0) {
 671                                         mask = std_mask(in.s_addr);
 672                                         if ((ntohl(in.s_addr) & ~mask) != 0)
 673                                                 mask = 0;
 674                                 }
 675                                 /* Without a netmask, do not worry about
 676                                  * whether the destination is a host or a
 677                                  * network. Try both and use the first name
 678                                  * we get.
 679                                  *
 680                                  * If we have a netmask we can make a
 681                                  * good guess.
 682                                  */
 683                                 if ((in.s_addr & ~mask) == 0) {
 684                                         np = getnetbyaddr((long)in.s_addr,
 685                                                           AF_INET);
 686                                         if (np != NULL)
 687                                                 name = np->n_name;
 688                                         else if (in.s_addr == 0)
 689                                                 name = "default";
 690                                 }
 691                                 if (name[0] == '\0'
 692                                     && ((in.s_addr & ~mask) != 0
 693                                         || mask == 0xffffffff)) {
 694                                         hp = gethostbyaddr(&in, sizeof(in),
 695                                                            AF_INET);
 696                                         if (hp != NULL)
 697                                                 name = hp->h_name;
 698                                 }
 699                         }
 700
 701                 } else if (n->n_family == RIP_AF_AUTH) {
 702                         na = (struct netauth*)n;
 703                         if (na->a_type == RIP_AUTH_PW
 704                             && n == IMSG.rip_nets) {
 705                                 printf("  Password Authentication: \"%s\"\n",
 706                                        qstring(na->au.au_pw, RIP_AUTH_PW_LEN));
 707                                 continue;
 708                         }
 709
 710                         if (na->a_type == RIP_AUTH_MD5
 711                             && n == IMSG.rip_nets) {
 712                                 printf("  MD5 Auth"
 713                                        " len=%d KeyID=%d"
 714                                        " auth_len=%d"
 715                                        " seqno=%#x"
 716                                        " rsvd=%#x,%#x\n",
 717                                        ntohs(na->au.a_md5.md5_pkt_len),
 718                                        na->au.a_md5.md5_keyid,
 719                                        na->au.a_md5.md5_auth_len,
 720                                        (int)ntohl(na->au.a_md5.md5_seqno),
 721                                        na->au.a_md5.rsvd[0],
 722                                        na->au.a_md5.rsvd[1]);
 723                                 md5_authed = 1;
 724                                 continue;
 725                         }
 726                         printf("  Authentication type %d: ", ntohs(na->a_type));
 727                         for (i = 0; i < (int)sizeof(na->au.au_pw); i++)
 728                                 printf("%02x ", na->au.au_pw[i]);
 729                         putc('\n', stdout);
 730                         if (md5_authed && n+1 > lim
 731                             && na->a_type == ntohs(1)) {
 732                                 MD5Init(&md5_ctx);
 733                                 MD5Update(&md5_ctx, (u_char *)&IMSG,
 734                                           (char *)na-(char *)&IMSG);
 735                                 MD5Update(&md5_ctx, (u_char *)passwd,
 736                                           RIP_AUTH_MD5_LEN);
 737                                 MD5Final(hash, &md5_ctx);
 738                                 printf("    %s hash\n",
 739                                        memcmp(hash, na->au.au_pw, sizeof(hash))
 740                                        ? "WRONG" : "correct");
 741                         }
 742                         continue;
 743
 744                 } else {
 745                         sprintf(net_buf, "(af %#x) %d.%d.%d.%d",
 746                                 ntohs(n->n_family),
 747                                 (char)(n->n_dst >> 24),
 748                                 (char)(n->n_dst >> 16),
 749                                 (char)(n->n_dst >> 8),
 750                                 (char)n->n_dst);
 751                 }
 752
 753                 printf("  %-18s metric %2d %-10s",
 754                        net_buf, (int)ntohl(n->n_metric), name);
 755
 756                 if (n->n_nhop != 0) {
 757                         in.s_addr = n->n_nhop;
 758                         if (nflag)
 759                                 hp = NULL;
 760                         else
 761                                 hp = gethostbyaddr(&in, sizeof(in), AF_INET);
 762                         printf(" nhop=%-15s%s",
 763                                (hp != NULL) ? hp->h_name : inet_ntoa(in),
 764                                (IMSG.rip_vers == RIPv1) ? " ?" : "");
 765                 }
 766                 if (n->n_tag != 0)
 767                         printf(" tag=%#x%s", n->n_tag,
 768                                (IMSG.rip_vers == RIPv1) ? " ?" : "");
 769                 putc('\n', stdout);
 770         }
 771 }
 772
 773
 774 /* Return the classical netmask for an IP address.
 775  */
 776 static u_int
 777 std_mask(u_int addr)                    /* in network order */
 778 {
 779         addr = ntohl(addr);             /* was a host, not a network */
 780
 781         if (addr == 0)                  /* default route has mask 0 */
 782                 return 0;
 783         if (IN_CLASSA(addr))
 784                 return IN_CLASSA_NET;
 785         if (IN_CLASSB(addr))
 786                 return IN_CLASSB_NET;
 787         return IN_CLASSC_NET;
 788 }
 789
 790
 791 /* get a network number as a name or a number, with an optional "/xx"
 792  * netmask.
 793  */
 794 static int                              /* 0=bad */
 795 getnet(char *name,
 796        struct netinfo *rt)
 797 {
 798         int i;
 799         struct netent *nentp;
 800         u_int mask;
 801         struct in_addr in;
 802         char hname[MAXHOSTNAMELEN+1];
 803         char *mname, *p;
 804
 805
 806         /* Detect and separate "1.2.3.4/24"
 807          */
 808         if (NULL != (mname = strrchr(name,'/'))) {
 809                 i = (int)(mname - name);
 810                 if (i > (int)sizeof(hname)-1)   /* name too long */
 811                         return 0;
 812                 memmove(hname, name, i);
 813                 hname[i] = '\0';
 814                 mname++;
 815                 name = hname;
 816         }
 817
 818         nentp = getnetbyname(name);
 819         if (nentp != NULL) {
 820                 in.s_addr = nentp->n_net;
 821         } else if (inet_aton(name, &in) == 1) {
 822                 in.s_addr = ntohl(in.s_addr);
 823         } else {
 824                 return 0;
 825         }
 826
 827         if (mname == NULL) {
 828                 mask = std_mask(in.s_addr);
 829                 if ((~mask & in.s_addr) != 0)
 830                         mask = 0xffffffff;
 831         } else {
 832                 mask = (u_int)strtoul(mname, &p, 0);
 833                 if (*p != '\0' || mask > 32)
 834                         return 0;
 835                 mask = 0xffffffff << (32-mask);
 836         }
 837
 838         rt->n_dst = htonl(in.s_addr);
 839         rt->n_family = RIP_AF_INET;
 840         rt->n_mask = htonl(mask);
 841         return 1;
 842 }
 843
 844
 845 /* strtok(), but honoring backslash
 846  */
 847 static int                              /* -1=bad */
 848 parse_quote(char **linep,
 849             const char *delims,
 850             char *delimp,
 851             char *buf,
 852             int lim)
 853 {
 854         char c, *pc;
 855         const char *p;
 856
 857
 858         pc = *linep;
 859         if (*pc == '\0')
 860                 return -1;
 861
 862         for (;;) {
 863                 if (lim == 0)
 864                         return -1;
 865                 c = *pc++;
 866                 if (c == '\0')
 867                         break;
 868
 869                 if (c == '\\' && *pc != '\0') {
 870                         if ((c = *pc++) == 'n') {
 871                                 c = '\n';
 872                         } else if (c == 'r') {
 873                                 c = '\r';
 874                         } else if (c == 't') {
 875                                 c = '\t';
 876                         } else if (c == 'b') {
 877                                 c = '\b';
 878                         } else if (c >= '0' && c <= '7') {
 879                                 c -= '0';
 880                                 if (*pc >= '0' && *pc <= '7') {
 881                                         c = (c<<3)+(*pc++ - '0');
 882                                         if (*pc >= '0' && *pc <= '7')
 883                                             c = (c<<3)+(*pc++ - '0');
 884                                 }
 885                         }
 886
 887                 } else {
 888                         for (p = delims; *p != '\0'; ++p) {
 889                                 if (*p == c)
 890                                         goto exit;
 891                         }
 892                 }
 893
 894                 *buf++ = c;
 895                 --lim;
 896         }
 897 exit:
 898         if (delimp != NULL)
 899                 *delimp = c;
 900         *linep = pc-1;
 901         if (lim != 0)
 902                 *buf = '\0';
 903         return 0;
 904 }