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. 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: src/sbin/routed/rtquery/rtquery.c,v 1.13 1999/08/28 00:14:21 peter Exp $
  30  */
  31
  32 char copyright[] =
  33 "@(#) Copyright (c) 1982, 1986, 1993\n\
  34         The Regents of the University of California.  All rights reserved.\n";
  35
  36 #include <sys/cdefs.h>
  37 #include <sys/param.h>
  38 #include <sys/protosw.h>
  39 #include <sys/socket.h>
  40 #include <sys/time.h>
  41 #include <netinet/in.h>
  42 #define RIPVERSION RIPv2
  43 #include <protocols/routed.h>
  44 #include <arpa/inet.h>
  45 #include <netdb.h>
  46 #include <errno.h>
  47 #include <unistd.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51
  52 #if !defined(__NetBSD__)
  53 static char sccsid[] __attribute__((unused))= "@(#)query.c      8.1 (Berkeley) 6/5/93";
  54 #elif defined(__NetBSD__)
  55 __RCSID("$NetBSD: rtquery.c,v 1.10 1999/02/23 10:47:41 christos Exp $");
  56 #endif
  57
  58 #define _HAVE_SIN_LEN
  59
  60 #define MD5_DIGEST_LEN 16
  61 typedef struct {
  62         u_int32_t state[4];             /* state (ABCD) */
  63         u_int32_t count[2];             /* # of bits, modulo 2^64 (LSB 1st) */
  64         unsigned char buffer[64];       /* input buffer */
  65 } MD5_CTX;
  66 extern void MD5Init(MD5_CTX*);
  67 extern void MD5Update(MD5_CTX*, u_char*, u_int);
  68 extern void MD5Final(u_char[MD5_DIGEST_LEN], MD5_CTX*);
  69
  70
  71 #define WTIME   15              /* Time to wait for all responses */
  72 #define STIME   (250*1000)      /* usec to wait for another response */
  73
  74 int     soc;
  75
  76 const char *pgmname;
  77
  78 union {
  79         struct rip rip;
  80         char    packet[MAXPACKETSIZE+MAXPATHLEN];
  81 } omsg_buf;
  82 #define OMSG omsg_buf.rip
  83 int omsg_len = sizeof(struct rip);
  84
  85 union {
  86         struct  rip rip;
  87         char    packet[MAXPACKETSIZE+1024];
  88         } imsg_buf;
  89 #define IMSG imsg_buf.rip
  90
  91 int     nflag;                          /* numbers, no names */
  92 int     pflag;                          /* play the `gated` game */
  93 int     ripv2 = 1;                      /* use RIP version 2 */
  94 int     wtime = WTIME;
  95 int     rflag;                          /* 1=ask about a particular route */
  96 int     trace, not_trace;               /* send trace command or not */
  97 int     auth_type = RIP_AUTH_NONE;
  98 char    passwd[RIP_AUTH_PW_LEN];
  99 u_long  keyid;
 100
 101 struct timeval sent;                    /* when query sent */
 102
 103 static char localhost_str[] = "localhost";
 104 static char *default_argv[] = {localhost_str, 0};
 105
 106 static void rip_input(struct sockaddr_in*, int);
 107 static int out(const char *);
 108 static void trace_loop(char *argv[]) __attribute((__noreturn__));
 109 static void query_loop(char *argv[], int) __attribute((__noreturn__));
 110 static int getnet(char *, struct netinfo *);
 111 static u_int std_mask(u_int);
 112 static int parse_quote(char **, const char *, char *, char *, int);
 113 static void usage(void);
 114
 115
 116 int
 117 main(int argc,
 118      char *argv[])
 119 {
 120         int ch, bsize;
 121         char *p, *options, *value, delim;
 122         const char *result;
 123
 124         OMSG.rip_nets[0].n_dst = RIP_DEFAULT;
 125         OMSG.rip_nets[0].n_family = RIP_AF_UNSPEC;
 126         OMSG.rip_nets[0].n_metric = htonl(HOPCNT_INFINITY);
 127
 128         pgmname = argv[0];
 129         delim = 0;
 130         while ((ch = getopt(argc, argv, "np1w:r:t:a:")) != -1)
 131                 switch (ch) {
 132                 case 'n':
 133                         not_trace = 1;
 134                         nflag = 1;
 135                         break;
 136
 137                 case 'p':
 138                         not_trace = 1;
 139                         pflag = 1;
 140                         break;
 141
 142                 case '1':
 143                         ripv2 = 0;
 144                         break;
 145
 146                 case 'w':
 147                         not_trace = 1;
 148                         wtime = (int)strtoul(optarg, &p, 0);
 149                         if (*p != '\0'
 150                             || wtime <= 0)
 151                                 usage();
 152                         break;
 153
 154                 case 'r':
 155                         not_trace = 1;
 156                         if (rflag)
 157                                 usage();
 158                         rflag = getnet(optarg, &OMSG.rip_nets[0]);
 159                         if (!rflag) {
 160                                 struct hostent *hp = gethostbyname(optarg);
 161                                 if (hp == NULL) {
 162                                         fprintf(stderr, "%s: %s:",
 163                                                 pgmname, optarg);
 164                                         herror(0);
 165                                         exit(1);
 166                                 }
 167                                 memcpy(&OMSG.rip_nets[0].n_dst, hp->h_addr,
 168                                        sizeof(OMSG.rip_nets[0].n_dst));
 169                                 OMSG.rip_nets[0].n_family = RIP_AF_INET;
 170                                 OMSG.rip_nets[0].n_mask = -1;
 171                                 rflag = 1;
 172                         }
 173                         break;
 174
 175                 case 't':
 176                         trace = 1;
 177                         options = optarg;
 178                         while (*options != '\0') {
 179                                 /* messy complications to make -W -Wall happy */
 180                                 static char on_str[] = "on";
 181                                 static char more_str[] = "more";
 182                                 static char off_str[] = "off";
 183                                 static char dump_str[] = "dump";
 184                                 static char *traceopts[] = {
 185 #                                   define TRACE_ON     0
 186                                         on_str,
 187 #                                   define TRACE_MORE   1
 188                                         more_str,
 189 #                                   define TRACE_OFF    2
 190                                         off_str,
 191 #                                   define TRACE_DUMP   3
 192                                         dump_str,
 193                                         0
 194                                 };
 195                                 result = "";
 196                                 switch (getsubopt(&options,traceopts,&value)) {
 197                                 case TRACE_ON:
 198                                         OMSG.rip_cmd = RIPCMD_TRACEON;
 199                                         if (!value
 200                                             || strlen(value) > MAXPATHLEN)
 201                                             usage();
 202                                         result = value;
 203                                         break;
 204                                 case TRACE_MORE:
 205                                         if (value)
 206                                             usage();
 207                                         OMSG.rip_cmd = RIPCMD_TRACEON;
 208                                         break;
 209                                 case TRACE_OFF:
 210                                         if (value)
 211                                             usage();
 212                                         OMSG.rip_cmd = RIPCMD_TRACEOFF;
 213                                         break;
 214                                 case TRACE_DUMP:
 215                                         if (value)
 216                                             usage();
 217                                         OMSG.rip_cmd = RIPCMD_TRACEON;
 218                                         result = "dump/../table";
 219                                         break;
 220                                 default:
 221                                         usage();
 222                                 }
 223                                 strcpy((char*)OMSG.rip_tracefile, result);
 224                                 omsg_len += strlen(result) - sizeof(OMSG.ripun);
 225                         }
 226                         break;
 227
 228                 case 'a':
 229                         not_trace = 1;
 230                         p = strchr(optarg,'=');
 231                         if (!p)
 232                                 usage();
 233                         *p++ = '\0';
 234                         if (!strcasecmp("passwd",optarg))
 235                                 auth_type = RIP_AUTH_PW;
 236                         else if (!strcasecmp("md5_passwd",optarg))
 237                                 auth_type = RIP_AUTH_MD5;
 238                         else
 239                                 usage();
 240                         if (0 > parse_quote(&p,"|",&delim,
 241                                             passwd, sizeof(passwd)))
 242                                 usage();
 243                         if (auth_type == RIP_AUTH_MD5
 244                             && delim == '|') {
 245                                 keyid = strtoul(p+1,&p,0);
 246                                 if (keyid > 255 || *p != '\0')
 247                                         usage();
 248                         } else if (delim != '\0') {
 249                                 usage();
 250                         }
 251                         break;
 252
 253                 default:
 254                         usage();
 255         }
 256         argv += optind;
 257         argc -= optind;
 258         if (not_trace && trace)
 259                 usage();
 260         if (argc == 0) {
 261                 argc = 1;
 262                 argv = default_argv;
 263         }
 264
 265         soc = socket(AF_INET, SOCK_DGRAM, 0);
 266         if (soc < 0) {
 267                 perror("socket");
 268                 exit(2);
 269         }
 270
 271         /* be prepared to receive a lot of routes */
 272         for (bsize = 127*1024; ; bsize -= 1024) {
 273                 if (setsockopt(soc, SOL_SOCKET, SO_RCVBUF,
 274                                &bsize, sizeof(bsize)) == 0)
 275                         break;
 276                 if (bsize <= 4*1024) {
 277                         perror("setsockopt SO_RCVBUF");
 278                         break;
 279                 }
 280         }
 281
 282         if (trace)
 283                 trace_loop(argv);
 284         else
 285                 query_loop(argv, argc);
 286         /* NOTREACHED */
 287         return 0;
 288 }
 289
 290
 291 static void
 292 usage(void)
 293 {
 294         fprintf(stderr,
 295                 "usage:  rtquery [-np1] [-r tgt_rt] [-w wtime]"
 296                 " [-a type=passwd] host1 [host2 ...]\n"
 297                 "\trtquery -t {on=filename|more|off|dump}"
 298                                 " host1 [host2 ...]\n");
 299         exit(1);
 300 }
 301
 302
 303 /* tell the target hosts about tracing
 304  */
 305 static void
 306 trace_loop(char *argv[])
 307 {
 308         struct sockaddr_in myaddr;
 309         int res;
 310
 311         if (geteuid() != 0) {
 312                 fprintf(stderr, "-t requires UID 0\n");
 313                 exit(1);
 314         }
 315
 316         if (ripv2) {
 317                 OMSG.rip_vers = RIPv2;
 318         } else {
 319                 OMSG.rip_vers = RIPv1;
 320         }
 321
 322         memset(&myaddr, 0, sizeof(myaddr));
 323         myaddr.sin_family = AF_INET;
 324 #ifdef _HAVE_SIN_LEN
 325         myaddr.sin_len = sizeof(myaddr);
 326 #endif
 327         myaddr.sin_port = htons(IPPORT_RESERVED-1);
 328         while (bind(soc, (struct sockaddr *)&myaddr, sizeof(myaddr)) < 0) {
 329                 if (errno != EADDRINUSE
 330                     || myaddr.sin_port == 0) {
 331                         perror("bind");
 332                         exit(2);
 333                 }
 334                 myaddr.sin_port = htons(ntohs(myaddr.sin_port)-1);
 335         }
 336
 337         res = 1;
 338         while (*argv != NULL) {
 339                 if (out(*argv++) <= 0)
 340                         res = 0;
 341         }
 342         exit(res);
 343 }
 344
 345
 346 /* query all of the listed hosts
 347  */
 348 static void
 349 query_loop(char *argv[], int argc)
 350 {
 351 #       define NA0 (OMSG.rip_auths[0])
 352 #       define NA2 (OMSG.rip_auths[2])
 353         struct seen {
 354                 struct seen *next;
 355                 struct in_addr addr;
 356         } *seen, *sp;
 357         int answered = 0;
 358         int cc;
 359         fd_set bits;
 360         struct timeval now, delay;
 361         struct sockaddr_in from;
 362         socklen_t fromlen;
 363         MD5_CTX md5_ctx;
 364
 365
 366         OMSG.rip_cmd = (pflag) ? RIPCMD_POLL : RIPCMD_REQUEST;
 367         if (ripv2) {
 368                 OMSG.rip_vers = RIPv2;
 369                 if (auth_type == RIP_AUTH_PW) {
 370                         OMSG.rip_nets[1] = OMSG.rip_nets[0];
 371                         NA0.a_family = RIP_AF_AUTH;
 372                         NA0.a_type = RIP_AUTH_PW;
 373                         memcpy(NA0.au.au_pw, passwd, RIP_AUTH_PW_LEN);
 374                         omsg_len += sizeof(OMSG.rip_nets[0]);
 375
 376                 } else if (auth_type == RIP_AUTH_MD5) {
 377                         OMSG.rip_nets[1] = OMSG.rip_nets[0];
 378                         NA0.a_family = RIP_AF_AUTH;
 379                         NA0.a_type = RIP_AUTH_MD5;
 380                         NA0.au.a_md5.md5_keyid = (int8_t)keyid;
 381                         NA0.au.a_md5.md5_auth_len = RIP_AUTH_MD5_LEN;
 382                         NA0.au.a_md5.md5_seqno = 0;
 383                         cc = (char *)&NA2-(char *)&OMSG;
 384                         NA0.au.a_md5.md5_pkt_len = htons(cc);
 385                         NA2.a_family = RIP_AF_AUTH;
 386                         NA2.a_type = htons(1);
 387                         MD5Init(&md5_ctx);
 388                         MD5Update(&md5_ctx,
 389                                   (u_char *)&OMSG, cc);
 390                         MD5Update(&md5_ctx,
 391                                   (u_char *)passwd, RIP_AUTH_MD5_LEN);
 392                         MD5Final(NA2.au.au_pw, &md5_ctx);
 393                         omsg_len += 2*sizeof(OMSG.rip_nets[0]);
 394                 }
 395
 396         } else {
 397                 OMSG.rip_vers = RIPv1;
 398                 OMSG.rip_nets[0].n_mask = 0;
 399         }
 400
 401         /* ask the first (valid) host */
 402         seen = NULL;
 403         while (0 > out(*argv++)) {
 404                 if (*argv == NULL)
 405                         exit(-1);
 406                 answered++;
 407         }
 408
 409         FD_ZERO(&bits);
 410         for (;;) {
 411                 FD_SET(soc, &bits);
 412                 delay.tv_sec = 0;
 413                 delay.tv_usec = STIME;
 414                 cc = select(soc+1, &bits, 0,0, &delay);
 415                 if (cc > 0) {
 416                         fromlen = sizeof(from);
 417                         cc = recvfrom(soc, imsg_buf.packet,
 418                                       sizeof(imsg_buf.packet), 0,
 419                                       (struct sockaddr *)&from, &fromlen);
 420                         if (cc < 0) {
 421                                 perror("recvfrom");
 422                                 exit(1);
 423                         }
 424                         /* count the distinct responding hosts.
 425                          * You cannot match responding hosts with
 426                          * addresses to which queries were transmitted,
 427                          * because a router might respond with a
 428                          * different source address.
 429                          */
 430                         for (sp = seen; sp != NULL; sp = sp->next) {
 431                                 if (sp->addr.s_addr == from.sin_addr.s_addr)
 432                                         break;
 433                         }
 434                         if (sp == NULL) {
 435                                 sp = malloc(sizeof(*sp));
 436                                 if (sp == NULL) {
 437                                         fprintf(stderr,
 438                                                 "rtquery: malloc failed\n");
 439                                         exit(1);
 440                                 }
 441                                 sp->addr = from.sin_addr;
 442                                 sp->next = seen;
 443                                 seen = sp;
 444                                 answered++;
 445                         }
 446
 447                         rip_input(&from, cc);
 448                         continue;
 449                 }
 450
 451                 if (cc < 0) {
 452                         if (errno == EINTR)
 453                                 continue;
 454                         perror("select");
 455                         exit(1);
 456                 }
 457
 458                 /* After a pause in responses, probe another host.
 459                  * This reduces the intermingling of answers.
 460                  */
 461                 while (*argv != NULL && 0 > out(*argv++))
 462                         answered++;
 463
 464                 /* continue until no more packets arrive
 465                  * or we have heard from all hosts
 466                  */
 467                 if (answered >= argc)
 468                         break;
 469
 470                 /* or until we have waited a long time
 471                  */
 472                 if (gettimeofday(&now, 0) < 0) {
 473                         perror("gettimeofday(now)");
 474                         exit(1);
 475                 }
 476                 if (sent.tv_sec + wtime <= now.tv_sec)
 477                         break;
 478         }
 479
 480         /* fail if there was no answer */
 481         exit (answered >= argc ? 0 : 1);
 482 }
 483
 484
 485 /* send to one host
 486  */
 487 static int
 488 out(const char *host)
 489 {
 490         struct sockaddr_in router;
 491         struct hostent *hp;
 492
 493         if (gettimeofday(&sent, 0) < 0) {
 494                 perror("gettimeofday(sent)");
 495                 return -1;
 496         }
 497
 498         memset(&router, 0, sizeof(router));
 499         router.sin_family = AF_INET;
 500 #ifdef _HAVE_SIN_LEN
 501         router.sin_len = sizeof(router);
 502 #endif
 503         if (!inet_aton(host, &router.sin_addr)) {
 504                 hp = gethostbyname(host);
 505                 if (hp == NULL) {
 506                         herror(host);
 507                         return -1;
 508                 }
 509                 memcpy(&router.sin_addr, hp->h_addr, sizeof(router.sin_addr));
 510         }
 511         router.sin_port = htons(RIP_PORT);
 512
 513         if (sendto(soc, &omsg_buf, omsg_len, 0,
 514                    (struct sockaddr *)&router, sizeof(router)) < 0) {
 515                 perror(host);
 516                 return -1;
 517         }
 518
 519         return 0;
 520 }
 521
 522
 523 /*
 524  * Convert string to printable characters
 525  */
 526 static char *
 527 qstring(u_char *s, int len)
 528 {
 529         static char buf[8*20+1];
 530         char *p;
 531         u_char *s2, c;
 532
 533
 534         for (p = buf; len != 0 && p < &buf[sizeof(buf)-1]; len--) {
 535                 c = *s++;
 536                 if (c == '\0') {
 537                         for (s2 = s+1; s2 < &s[len]; s2++) {
 538                                 if (*s2 != '\0')
 539                                         break;
 540                         }
 541                         if (s2 >= &s[len])
 542                             goto exit;
 543                 }
 544
 545                 if (c >= ' ' && c < 0x7f && c != '\\') {
 546                         *p++ = c;
 547                         continue;
 548                 }
 549                 *p++ = '\\';
 550                 switch (c) {
 551                 case '\\':
 552                         *p++ = '\\';
 553                         break;
 554                 case '\n':
 555                         *p++= 'n';
 556                         break;
 557                 case '\r':
 558                         *p++= 'r';
 559                         break;
 560                 case '\t':
 561                         *p++ = 't';
 562                         break;
 563                 case '\b':
 564                         *p++ = 'b';
 565                         break;
 566                 default:
 567                         p += sprintf(p,"%o",c);
 568                         break;
 569                 }
 570         }
 571 exit:
 572         *p = '\0';
 573         return buf;
 574 }
 575
 576
 577 /*
 578  * Handle an incoming RIP packet.
 579  */
 580 static void
 581 rip_input(struct sockaddr_in *from,
 582           int size)
 583 {
 584         struct netinfo *n, *lim;
 585         struct in_addr in;
 586         const char *name;
 587         char net_buf[80];
 588         u_char hash[RIP_AUTH_MD5_LEN];
 589         MD5_CTX md5_ctx;
 590         u_char md5_authed = 0;
 591         u_int mask, dmask;
 592         char *sp;
 593         int i;
 594         struct hostent *hp;
 595         struct netent *np;
 596         struct netauth *na;
 597
 598
 599         if (nflag) {
 600                 printf("%s:", inet_ntoa(from->sin_addr));
 601         } else {
 602                 hp = gethostbyaddr(&from->sin_addr, sizeof(struct in_addr),
 603                                    AF_INET);
 604                 if (hp == NULL) {
 605                         printf("%s:",
 606                                inet_ntoa(from->sin_addr));
 607                 } else {
 608                         printf("%s (%s):", hp->h_name,
 609                                inet_ntoa(from->sin_addr));
 610                 }
 611         }
 612         if (IMSG.rip_cmd != RIPCMD_RESPONSE) {
 613                 printf("\n    unexpected response type %d\n", IMSG.rip_cmd);
 614                 return;
 615         }
 616         printf(" RIPv%d%s %d bytes\n", IMSG.rip_vers,
 617                (IMSG.rip_vers != RIPv1 && IMSG.rip_vers != RIPv2) ? " ?" : "",
 618                size);
 619         if (size > MAXPACKETSIZE) {
 620                 if (size > (int)sizeof(imsg_buf) - (int)sizeof(*n)) {
 621                         printf("       at least %d bytes too long\n",
 622                                size-MAXPACKETSIZE);
 623                         size = (int)sizeof(imsg_buf) - (int)sizeof(*n);
 624                 } else {
 625                         printf("       %d bytes too long\n",
 626                                size-MAXPACKETSIZE);
 627                 }
 628         } else if (size%sizeof(*n) != sizeof(struct rip)%sizeof(*n)) {
 629                 printf("    response of bad length=%d\n", size);
 630         }
 631
 632         n = IMSG.rip_nets;
 633         lim = (struct netinfo *)((char*)n + size) - 1;
 634         for (; n <= lim; n++) {
 635                 name = "";
 636                 if (n->n_family == RIP_AF_INET) {
 637                         in.s_addr = n->n_dst;
 638                         strcpy(net_buf, inet_ntoa(in));
 639
 640                         mask = ntohl(n->n_mask);
 641                         dmask = mask & -mask;
 642                         if (mask != 0) {
 643                                 sp = &net_buf[strlen(net_buf)];
 644                                 if (IMSG.rip_vers == RIPv1) {
 645                                         sprintf(sp," mask=%#x ? ",mask);
 646                                         mask = 0;
 647                                 } else if (mask + dmask == 0) {
 648                                         for (i = 0;
 649                                              (i != 32
 650                                               && ((1<<i)&mask) == 0);
 651                                              i++)
 652                                                 continue;
 653                                         sprintf(sp, "/%d",32-i);
 654                                 } else {
 655                                         sprintf(sp," (mask %#x)", mask);
 656                                 }
 657                         }
 658
 659                         if (!nflag) {
 660                                 if (mask == 0) {
 661                                         mask = std_mask(in.s_addr);
 662                                         if ((ntohl(in.s_addr) & ~mask) != 0)
 663                                                 mask = 0;
 664                                 }
 665                                 /* Without a netmask, do not worry about
 666                                  * whether the destination is a host or a
 667                                  * network. Try both and use the first name
 668                                  * we get.
 669                                  *
 670                                  * If we have a netmask we can make a
 671                                  * good guess.
 672                                  */
 673                                 if ((in.s_addr & ~mask) == 0) {
 674                                         np = getnetbyaddr((long)in.s_addr,
 675                                                           AF_INET);
 676                                         if (np != NULL)
 677                                                 name = np->n_name;
 678                                         else if (in.s_addr == 0)
 679                                                 name = "default";
 680                                 }
 681                                 if (name[0] == '\0'
 682                                     && ((in.s_addr & ~mask) != 0
 683                                         || mask == 0xffffffff)) {
 684                                         hp = gethostbyaddr(&in, sizeof(in),
 685                                                            AF_INET);
 686                                         if (hp != NULL)
 687                                                 name = hp->h_name;
 688                                 }
 689                         }
 690
 691                 } else if (n->n_family == RIP_AF_AUTH) {
 692                         na = (struct netauth*)n;
 693                         if (na->a_type == RIP_AUTH_PW
 694                             && n == IMSG.rip_nets) {
 695                                 printf("  Password Authentication: \"%s\"\n",
 696                                        qstring(na->au.au_pw, RIP_AUTH_PW_LEN));
 697                                 continue;
 698                         }
 699
 700                         if (na->a_type == RIP_AUTH_MD5
 701                             && n == IMSG.rip_nets) {
 702                                 printf("  MD5 Auth"
 703                                        " len=%d KeyID=%d"
 704                                        " auth_len=%d"
 705                                        " seqno=%#x"
 706                                        " rsvd=%#x,%#x\n",
 707                                        ntohs(na->au.a_md5.md5_pkt_len),
 708                                        na->au.a_md5.md5_keyid,
 709                                        na->au.a_md5.md5_auth_len,
 710                                        (int)ntohl(na->au.a_md5.md5_seqno),
 711                                        na->au.a_md5.rsvd[0],
 712                                        na->au.a_md5.rsvd[1]);
 713                                 md5_authed = 1;
 714                                 continue;
 715                         }
 716                         printf("  Authentication type %d: ", ntohs(na->a_type));
 717                         for (i = 0; i < (int)sizeof(na->au.au_pw); i++)
 718                                 printf("%02x ", na->au.au_pw[i]);
 719                         putc('\n', stdout);
 720                         if (md5_authed && n+1 > lim
 721                             && na->a_type == ntohs(1)) {
 722                                 MD5Init(&md5_ctx);
 723                                 MD5Update(&md5_ctx, (u_char *)&IMSG,
 724                                           (char *)na-(char *)&IMSG);
 725                                 MD5Update(&md5_ctx, (u_char *)passwd,
 726                                           RIP_AUTH_MD5_LEN);
 727                                 MD5Final(hash, &md5_ctx);
 728                                 printf("    %s hash\n",
 729                                        memcmp(hash, na->au.au_pw, sizeof(hash))
 730                                        ? "WRONG" : "correct");
 731                         }
 732                         continue;
 733
 734                 } else {
 735                         sprintf(net_buf, "(af %#x) %d.%d.%d.%d",
 736                                 ntohs(n->n_family),
 737                                 (char)(n->n_dst >> 24),
 738                                 (char)(n->n_dst >> 16),
 739                                 (char)(n->n_dst >> 8),
 740                                 (char)n->n_dst);
 741                 }
 742
 743                 printf("  %-18s metric %2d %-10s",
 744                        net_buf, (int)ntohl(n->n_metric), name);
 745
 746                 if (n->n_nhop != 0) {
 747                         in.s_addr = n->n_nhop;
 748                         if (nflag)
 749                                 hp = NULL;
 750                         else
 751                                 hp = gethostbyaddr(&in, sizeof(in), AF_INET);
 752                         printf(" nhop=%-15s%s",
 753                                (hp != NULL) ? hp->h_name : inet_ntoa(in),
 754                                (IMSG.rip_vers == RIPv1) ? " ?" : "");
 755                 }
 756                 if (n->n_tag != 0)
 757                         printf(" tag=%#x%s", n->n_tag,
 758                                (IMSG.rip_vers == RIPv1) ? " ?" : "");
 759                 putc('\n', stdout);
 760         }
 761 }
 762
 763
 764 /* Return the classical netmask for an IP address.
 765  */
 766 static u_int
 767 std_mask(u_int addr)                    /* in network order */
 768 {
 769         addr = ntohl(addr);             /* was a host, not a network */
 770
 771         if (addr == 0)                  /* default route has mask 0 */
 772                 return 0;
 773         if (IN_CLASSA(addr))
 774                 return IN_CLASSA_NET;
 775         if (IN_CLASSB(addr))
 776                 return IN_CLASSB_NET;
 777         return IN_CLASSC_NET;
 778 }
 779
 780
 781 /* get a network number as a name or a number, with an optional "/xx"
 782  * netmask.
 783  */
 784 static int                              /* 0=bad */
 785 getnet(char *name,
 786        struct netinfo *rt)
 787 {
 788         int i;
 789         struct netent *nentp;
 790         u_int mask;
 791         struct in_addr in;
 792         char hname[MAXHOSTNAMELEN+1];
 793         char *mname, *p;
 794
 795
 796         /* Detect and separate "1.2.3.4/24"
 797          */
 798         if (NULL != (mname = strrchr(name,'/'))) {
 799                 i = (int)(mname - name);
 800                 if (i > (int)sizeof(hname)-1)   /* name too long */
 801                         return 0;
 802                 memmove(hname, name, i);
 803                 hname[i] = '\0';
 804                 mname++;
 805                 name = hname;
 806         }
 807
 808         nentp = getnetbyname(name);
 809         if (nentp != NULL) {
 810                 in.s_addr = nentp->n_net;
 811         } else if (inet_aton(name, &in) == 1) {
 812                 in.s_addr = ntohl(in.s_addr);
 813         } else {
 814                 return 0;
 815         }
 816
 817         if (mname == NULL) {
 818                 mask = std_mask(in.s_addr);
 819                 if ((~mask & in.s_addr) != 0)
 820                         mask = 0xffffffff;
 821         } else {
 822                 mask = (u_int)strtoul(mname, &p, 0);
 823                 if (*p != '\0' || mask > 32)
 824                         return 0;
 825                 mask = 0xffffffff << (32-mask);
 826         }
 827
 828         rt->n_dst = htonl(in.s_addr);
 829         rt->n_family = RIP_AF_INET;
 830         rt->n_mask = htonl(mask);
 831         return 1;
 832 }
 833
 834
 835 /* strtok(), but honoring backslash
 836  */
 837 static int                              /* -1=bad */
 838 parse_quote(char **linep,
 839             const char *delims,
 840             char *delimp,
 841             char *buf,
 842             int lim)
 843 {
 844         char c, *pc;
 845         const char *p;
 846
 847
 848         pc = *linep;
 849         if (*pc == '\0')
 850                 return -1;
 851
 852         for (;;) {
 853                 if (lim == 0)
 854                         return -1;
 855                 c = *pc++;
 856                 if (c == '\0')
 857                         break;
 858
 859                 if (c == '\\' && *pc != '\0') {
 860                         if ((c = *pc++) == 'n') {
 861                                 c = '\n';
 862                         } else if (c == 'r') {
 863                                 c = '\r';
 864                         } else if (c == 't') {
 865                                 c = '\t';
 866                         } else if (c == 'b') {
 867                                 c = '\b';
 868                         } else if (c >= '0' && c <= '7') {
 869                                 c -= '0';
 870                                 if (*pc >= '0' && *pc <= '7') {
 871                                         c = (c<<3)+(*pc++ - '0');
 872                                         if (*pc >= '0' && *pc <= '7')
 873                                             c = (c<<3)+(*pc++ - '0');
 874                                 }
 875                         }
 876
 877                 } else {
 878                         for (p = delims; *p != '\0'; ++p) {
 879                                 if (*p == c)
 880                                         goto exit;
 881                         }
 882                 }
 883
 884                 *buf++ = c;
 885                 --lim;
 886         }
 887 exit:
 888         if (delimp != NULL)
 889                 *delimp = c;
 890         *linep = pc-1;
 891         if (lim != 0)
 892                 *buf = '\0';
 893         return 0;
 894 }