| 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 | * $DragonFly: src/sbin/routed/rtquery/rtquery.c,v 1.4 2004/12/18 21:43:46 swildner Exp $ |
| 35 | */ |
| 36 | |
| 37 | char copyright[] = |
| 38 | "@(#) Copyright (c) 1982, 1986, 1993\n\ |
| 39 | The Regents of the University of California. All rights reserved.\n"; |
| 40 | |
| 41 | #include <sys/cdefs.h> |
| 42 | #include <sys/param.h> |
| 43 | #include <sys/protosw.h> |
| 44 | #include <sys/socket.h> |
| 45 | #include <sys/time.h> |
| 46 | #include <netinet/in.h> |
| 47 | #define RIPVERSION RIPv2 |
| 48 | #include <protocols/routed.h> |
| 49 | #include <arpa/inet.h> |
| 50 | #include <netdb.h> |
| 51 | #include <errno.h> |
| 52 | #include <unistd.h> |
| 53 | #include <stdio.h> |
| 54 | #include <stdlib.h> |
| 55 | #include <string.h> |
| 56 | #ifdef sgi |
| 57 | #include <strings.h> |
| 58 | #include <bstring.h> |
| 59 | #endif |
| 60 | |
| 61 | #if !defined(sgi) && !defined(__NetBSD__) |
| 62 | static char sccsid[] __attribute__((unused))= "@(#)query.c 8.1 (Berkeley) 6/5/93"; |
| 63 | #elif defined(__NetBSD__) |
| 64 | __RCSID("$NetBSD: rtquery.c,v 1.10 1999/02/23 10:47:41 christos Exp $"); |
| 65 | #endif |
| 66 | #ident "$Revision: 1.12 $" |
| 67 | |
| 68 | #ifndef sgi |
| 69 | #define _HAVE_SIN_LEN |
| 70 | #endif |
| 71 | |
| 72 | #define MD5_DIGEST_LEN 16 |
| 73 | typedef struct { |
| 74 | u_int32_t state[4]; /* state (ABCD) */ |
| 75 | u_int32_t count[2]; /* # of bits, modulo 2^64 (LSB 1st) */ |
| 76 | unsigned char buffer[64]; /* input buffer */ |
| 77 | } MD5_CTX; |
| 78 | extern void MD5Init(MD5_CTX*); |
| 79 | extern void MD5Update(MD5_CTX*, u_char*, u_int); |
| 80 | extern void MD5Final(u_char[MD5_DIGEST_LEN], MD5_CTX*); |
| 81 | |
| 82 | |
| 83 | #define WTIME 15 /* Time to wait for all responses */ |
| 84 | #define STIME (250*1000) /* usec to wait for another response */ |
| 85 | |
| 86 | int soc; |
| 87 | |
| 88 | const char *pgmname; |
| 89 | |
| 90 | union { |
| 91 | struct rip rip; |
| 92 | char packet[MAXPACKETSIZE+MAXPATHLEN]; |
| 93 | } omsg_buf; |
| 94 | #define OMSG omsg_buf.rip |
| 95 | int omsg_len = sizeof(struct rip); |
| 96 | |
| 97 | union { |
| 98 | struct rip rip; |
| 99 | char packet[MAXPACKETSIZE+1024]; |
| 100 | } imsg_buf; |
| 101 | #define IMSG imsg_buf.rip |
| 102 | |
| 103 | int nflag; /* numbers, no names */ |
| 104 | int pflag; /* play the `gated` game */ |
| 105 | int ripv2 = 1; /* use RIP version 2 */ |
| 106 | int wtime = WTIME; |
| 107 | int rflag; /* 1=ask about a particular route */ |
| 108 | int trace, not_trace; /* send trace command or not */ |
| 109 | int auth_type = RIP_AUTH_NONE; |
| 110 | char passwd[RIP_AUTH_PW_LEN]; |
| 111 | u_long keyid; |
| 112 | |
| 113 | struct timeval sent; /* when query sent */ |
| 114 | |
| 115 | static char localhost_str[] = "localhost"; |
| 116 | static char *default_argv[] = {localhost_str, 0}; |
| 117 | |
| 118 | static void rip_input(struct sockaddr_in*, int); |
| 119 | static int out(const char *); |
| 120 | static void trace_loop(char *argv[]) __attribute((__noreturn__)); |
| 121 | static void query_loop(char *argv[], int) __attribute((__noreturn__)); |
| 122 | static int getnet(char *, struct netinfo *); |
| 123 | static u_int std_mask(u_int); |
| 124 | static int parse_quote(char **, const char *, char *, char *, int); |
| 125 | static void usage(void); |
| 126 | |
| 127 | |
| 128 | int |
| 129 | main(int argc, |
| 130 | char *argv[]) |
| 131 | { |
| 132 | int ch, bsize; |
| 133 | char *p, *options, *value, delim; |
| 134 | const char *result; |
| 135 | |
| 136 | OMSG.rip_nets[0].n_dst = RIP_DEFAULT; |
| 137 | OMSG.rip_nets[0].n_family = RIP_AF_UNSPEC; |
| 138 | OMSG.rip_nets[0].n_metric = htonl(HOPCNT_INFINITY); |
| 139 | |
| 140 | pgmname = argv[0]; |
| 141 | while ((ch = getopt(argc, argv, "np1w:r:t:a:")) != -1) |
| 142 | switch (ch) { |
| 143 | case 'n': |
| 144 | not_trace = 1; |
| 145 | nflag = 1; |
| 146 | break; |
| 147 | |
| 148 | case 'p': |
| 149 | not_trace = 1; |
| 150 | pflag = 1; |
| 151 | break; |
| 152 | |
| 153 | case '1': |
| 154 | ripv2 = 0; |
| 155 | break; |
| 156 | |
| 157 | case 'w': |
| 158 | not_trace = 1; |
| 159 | wtime = (int)strtoul(optarg, &p, 0); |
| 160 | if (*p != '\0' |
| 161 | || wtime <= 0) |
| 162 | usage(); |
| 163 | break; |
| 164 | |
| 165 | case 'r': |
| 166 | not_trace = 1; |
| 167 | if (rflag) |
| 168 | usage(); |
| 169 | rflag = getnet(optarg, &OMSG.rip_nets[0]); |
| 170 | if (!rflag) { |
| 171 | struct hostent *hp = gethostbyname(optarg); |
| 172 | if (hp == 0) { |
| 173 | fprintf(stderr, "%s: %s:", |
| 174 | pgmname, optarg); |
| 175 | herror(0); |
| 176 | exit(1); |
| 177 | } |
| 178 | memcpy(&OMSG.rip_nets[0].n_dst, hp->h_addr, |
| 179 | sizeof(OMSG.rip_nets[0].n_dst)); |
| 180 | OMSG.rip_nets[0].n_family = RIP_AF_INET; |
| 181 | OMSG.rip_nets[0].n_mask = -1; |
| 182 | rflag = 1; |
| 183 | } |
| 184 | break; |
| 185 | |
| 186 | case 't': |
| 187 | trace = 1; |
| 188 | options = optarg; |
| 189 | while (*options != '\0') { |
| 190 | /* messy complications to make -W -Wall happy */ |
| 191 | static char on_str[] = "on"; |
| 192 | static char more_str[] = "more"; |
| 193 | static char off_str[] = "off"; |
| 194 | static char dump_str[] = "dump"; |
| 195 | static char *traceopts[] = { |
| 196 | # define TRACE_ON 0 |
| 197 | on_str, |
| 198 | # define TRACE_MORE 1 |
| 199 | more_str, |
| 200 | # define TRACE_OFF 2 |
| 201 | off_str, |
| 202 | # define TRACE_DUMP 3 |
| 203 | dump_str, |
| 204 | 0 |
| 205 | }; |
| 206 | result = ""; |
| 207 | switch (getsubopt(&options,traceopts,&value)) { |
| 208 | case TRACE_ON: |
| 209 | OMSG.rip_cmd = RIPCMD_TRACEON; |
| 210 | if (!value |
| 211 | || strlen(value) > MAXPATHLEN) |
| 212 | usage(); |
| 213 | result = value; |
| 214 | break; |
| 215 | case TRACE_MORE: |
| 216 | if (value) |
| 217 | usage(); |
| 218 | OMSG.rip_cmd = RIPCMD_TRACEON; |
| 219 | break; |
| 220 | case TRACE_OFF: |
| 221 | if (value) |
| 222 | usage(); |
| 223 | OMSG.rip_cmd = RIPCMD_TRACEOFF; |
| 224 | break; |
| 225 | case TRACE_DUMP: |
| 226 | if (value) |
| 227 | usage(); |
| 228 | OMSG.rip_cmd = RIPCMD_TRACEON; |
| 229 | result = "dump/../table"; |
| 230 | break; |
| 231 | default: |
| 232 | usage(); |
| 233 | } |
| 234 | strcpy((char*)OMSG.rip_tracefile, result); |
| 235 | omsg_len += strlen(result) - sizeof(OMSG.ripun); |
| 236 | } |
| 237 | break; |
| 238 | |
| 239 | case 'a': |
| 240 | not_trace = 1; |
| 241 | p = strchr(optarg,'='); |
| 242 | if (!p) |
| 243 | usage(); |
| 244 | *p++ = '\0'; |
| 245 | if (!strcasecmp("passwd",optarg)) |
| 246 | auth_type = RIP_AUTH_PW; |
| 247 | else if (!strcasecmp("md5_passwd",optarg)) |
| 248 | auth_type = RIP_AUTH_MD5; |
| 249 | else |
| 250 | usage(); |
| 251 | if (0 > parse_quote(&p,"|",&delim, |
| 252 | passwd, sizeof(passwd))) |
| 253 | usage(); |
| 254 | if (auth_type == RIP_AUTH_MD5 |
| 255 | && delim == '|') { |
| 256 | keyid = strtoul(p+1,&p,0); |
| 257 | if (keyid > 255 || *p != '\0') |
| 258 | usage(); |
| 259 | } else if (delim != '\0') { |
| 260 | usage(); |
| 261 | } |
| 262 | break; |
| 263 | |
| 264 | default: |
| 265 | usage(); |
| 266 | } |
| 267 | argv += optind; |
| 268 | argc -= optind; |
| 269 | if (not_trace && trace) |
| 270 | usage(); |
| 271 | if (argc == 0) { |
| 272 | argc = 1; |
| 273 | argv = default_argv; |
| 274 | } |
| 275 | |
| 276 | soc = socket(AF_INET, SOCK_DGRAM, 0); |
| 277 | if (soc < 0) { |
| 278 | perror("socket"); |
| 279 | exit(2); |
| 280 | } |
| 281 | |
| 282 | /* be prepared to receive a lot of routes */ |
| 283 | for (bsize = 127*1024; ; bsize -= 1024) { |
| 284 | if (setsockopt(soc, SOL_SOCKET, SO_RCVBUF, |
| 285 | &bsize, sizeof(bsize)) == 0) |
| 286 | break; |
| 287 | if (bsize <= 4*1024) { |
| 288 | perror("setsockopt SO_RCVBUF"); |
| 289 | break; |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | if (trace) |
| 294 | trace_loop(argv); |
| 295 | else |
| 296 | query_loop(argv, argc); |
| 297 | /* NOTREACHED */ |
| 298 | return 0; |
| 299 | } |
| 300 | |
| 301 | |
| 302 | static void |
| 303 | usage(void) |
| 304 | { |
| 305 | fprintf(stderr, |
| 306 | "usage: rtquery [-np1] [-r tgt_rt] [-w wtime]" |
| 307 | " [-a type=passwd] host1 [host2 ...]\n" |
| 308 | "\trtquery -t {on=filename|more|off|dump}" |
| 309 | " host1 [host2 ...]\n"); |
| 310 | exit(1); |
| 311 | } |
| 312 | |
| 313 | |
| 314 | /* tell the target hosts about tracing |
| 315 | */ |
| 316 | static void |
| 317 | trace_loop(char *argv[]) |
| 318 | { |
| 319 | struct sockaddr_in myaddr; |
| 320 | int res; |
| 321 | |
| 322 | if (geteuid() != 0) { |
| 323 | fprintf(stderr, "-t requires UID 0\n"); |
| 324 | exit(1); |
| 325 | } |
| 326 | |
| 327 | if (ripv2) { |
| 328 | OMSG.rip_vers = RIPv2; |
| 329 | } else { |
| 330 | OMSG.rip_vers = RIPv1; |
| 331 | } |
| 332 | |
| 333 | memset(&myaddr, 0, sizeof(myaddr)); |
| 334 | myaddr.sin_family = AF_INET; |
| 335 | #ifdef _HAVE_SIN_LEN |
| 336 | myaddr.sin_len = sizeof(myaddr); |
| 337 | #endif |
| 338 | myaddr.sin_port = htons(IPPORT_RESERVED-1); |
| 339 | while (bind(soc, (struct sockaddr *)&myaddr, sizeof(myaddr)) < 0) { |
| 340 | if (errno != EADDRINUSE |
| 341 | || myaddr.sin_port == 0) { |
| 342 | perror("bind"); |
| 343 | exit(2); |
| 344 | } |
| 345 | myaddr.sin_port = htons(ntohs(myaddr.sin_port)-1); |
| 346 | } |
| 347 | |
| 348 | res = 1; |
| 349 | while (*argv != 0) { |
| 350 | if (out(*argv++) <= 0) |
| 351 | res = 0; |
| 352 | } |
| 353 | exit(res); |
| 354 | } |
| 355 | |
| 356 | |
| 357 | /* query all of the listed hosts |
| 358 | */ |
| 359 | static void |
| 360 | query_loop(char *argv[], int argc) |
| 361 | { |
| 362 | # define NA0 (OMSG.rip_auths[0]) |
| 363 | # define NA2 (OMSG.rip_auths[2]) |
| 364 | struct seen { |
| 365 | struct seen *next; |
| 366 | struct in_addr addr; |
| 367 | } *seen, *sp; |
| 368 | int answered = 0; |
| 369 | int cc; |
| 370 | fd_set bits; |
| 371 | struct timeval now, delay; |
| 372 | struct sockaddr_in from; |
| 373 | int fromlen; |
| 374 | MD5_CTX md5_ctx; |
| 375 | |
| 376 | |
| 377 | OMSG.rip_cmd = (pflag) ? RIPCMD_POLL : RIPCMD_REQUEST; |
| 378 | if (ripv2) { |
| 379 | OMSG.rip_vers = RIPv2; |
| 380 | if (auth_type == RIP_AUTH_PW) { |
| 381 | OMSG.rip_nets[1] = OMSG.rip_nets[0]; |
| 382 | NA0.a_family = RIP_AF_AUTH; |
| 383 | NA0.a_type = RIP_AUTH_PW; |
| 384 | memcpy(NA0.au.au_pw, passwd, RIP_AUTH_PW_LEN); |
| 385 | omsg_len += sizeof(OMSG.rip_nets[0]); |
| 386 | |
| 387 | } else if (auth_type == RIP_AUTH_MD5) { |
| 388 | OMSG.rip_nets[1] = OMSG.rip_nets[0]; |
| 389 | NA0.a_family = RIP_AF_AUTH; |
| 390 | NA0.a_type = RIP_AUTH_MD5; |
| 391 | NA0.au.a_md5.md5_keyid = (int8_t)keyid; |
| 392 | NA0.au.a_md5.md5_auth_len = RIP_AUTH_MD5_LEN; |
| 393 | NA0.au.a_md5.md5_seqno = 0; |
| 394 | cc = (char *)&NA2-(char *)&OMSG; |
| 395 | NA0.au.a_md5.md5_pkt_len = htons(cc); |
| 396 | NA2.a_family = RIP_AF_AUTH; |
| 397 | NA2.a_type = htons(1); |
| 398 | MD5Init(&md5_ctx); |
| 399 | MD5Update(&md5_ctx, |
| 400 | (u_char *)&OMSG, cc); |
| 401 | MD5Update(&md5_ctx, |
| 402 | (u_char *)passwd, RIP_AUTH_MD5_LEN); |
| 403 | MD5Final(NA2.au.au_pw, &md5_ctx); |
| 404 | omsg_len += 2*sizeof(OMSG.rip_nets[0]); |
| 405 | } |
| 406 | |
| 407 | } else { |
| 408 | OMSG.rip_vers = RIPv1; |
| 409 | OMSG.rip_nets[0].n_mask = 0; |
| 410 | } |
| 411 | |
| 412 | /* ask the first (valid) host */ |
| 413 | seen = 0; |
| 414 | while (0 > out(*argv++)) { |
| 415 | if (*argv == 0) |
| 416 | exit(-1); |
| 417 | answered++; |
| 418 | } |
| 419 | |
| 420 | FD_ZERO(&bits); |
| 421 | for (;;) { |
| 422 | FD_SET(soc, &bits); |
| 423 | delay.tv_sec = 0; |
| 424 | delay.tv_usec = STIME; |
| 425 | cc = select(soc+1, &bits, 0,0, &delay); |
| 426 | if (cc > 0) { |
| 427 | fromlen = sizeof(from); |
| 428 | cc = recvfrom(soc, imsg_buf.packet, |
| 429 | sizeof(imsg_buf.packet), 0, |
| 430 | (struct sockaddr *)&from, &fromlen); |
| 431 | if (cc < 0) { |
| 432 | perror("recvfrom"); |
| 433 | exit(1); |
| 434 | } |
| 435 | /* count the distinct responding hosts. |
| 436 | * You cannot match responding hosts with |
| 437 | * addresses to which queries were transmitted, |
| 438 | * because a router might respond with a |
| 439 | * different source address. |
| 440 | */ |
| 441 | for (sp = seen; sp != 0; sp = sp->next) { |
| 442 | if (sp->addr.s_addr == from.sin_addr.s_addr) |
| 443 | break; |
| 444 | } |
| 445 | if (sp == 0) { |
| 446 | sp = malloc(sizeof(*sp)); |
| 447 | if (sp == 0) { |
| 448 | fprintf(stderr, |
| 449 | "rtquery: malloc failed\n"); |
| 450 | exit(1); |
| 451 | } |
| 452 | sp->addr = from.sin_addr; |
| 453 | sp->next = seen; |
| 454 | seen = sp; |
| 455 | answered++; |
| 456 | } |
| 457 | |
| 458 | rip_input(&from, cc); |
| 459 | continue; |
| 460 | } |
| 461 | |
| 462 | if (cc < 0) { |
| 463 | if (errno == EINTR) |
| 464 | continue; |
| 465 | perror("select"); |
| 466 | exit(1); |
| 467 | } |
| 468 | |
| 469 | /* After a pause in responses, probe another host. |
| 470 | * This reduces the intermingling of answers. |
| 471 | */ |
| 472 | while (*argv != 0 && 0 > out(*argv++)) |
| 473 | answered++; |
| 474 | |
| 475 | /* continue until no more packets arrive |
| 476 | * or we have heard from all hosts |
| 477 | */ |
| 478 | if (answered >= argc) |
| 479 | break; |
| 480 | |
| 481 | /* or until we have waited a long time |
| 482 | */ |
| 483 | if (gettimeofday(&now, 0) < 0) { |
| 484 | perror("gettimeofday(now)"); |
| 485 | exit(1); |
| 486 | } |
| 487 | if (sent.tv_sec + wtime <= now.tv_sec) |
| 488 | break; |
| 489 | } |
| 490 | |
| 491 | /* fail if there was no answer */ |
| 492 | exit (answered >= argc ? 0 : 1); |
| 493 | } |
| 494 | |
| 495 | |
| 496 | /* send to one host |
| 497 | */ |
| 498 | static int |
| 499 | out(const char *host) |
| 500 | { |
| 501 | struct sockaddr_in router; |
| 502 | struct hostent *hp; |
| 503 | |
| 504 | if (gettimeofday(&sent, 0) < 0) { |
| 505 | perror("gettimeofday(sent)"); |
| 506 | return -1; |
| 507 | } |
| 508 | |
| 509 | memset(&router, 0, sizeof(router)); |
| 510 | router.sin_family = AF_INET; |
| 511 | #ifdef _HAVE_SIN_LEN |
| 512 | router.sin_len = sizeof(router); |
| 513 | #endif |
| 514 | if (!inet_aton(host, &router.sin_addr)) { |
| 515 | hp = gethostbyname(host); |
| 516 | if (hp == 0) { |
| 517 | herror(host); |
| 518 | return -1; |
| 519 | } |
| 520 | memcpy(&router.sin_addr, hp->h_addr, sizeof(router.sin_addr)); |
| 521 | } |
| 522 | router.sin_port = htons(RIP_PORT); |
| 523 | |
| 524 | if (sendto(soc, &omsg_buf, omsg_len, 0, |
| 525 | (struct sockaddr *)&router, sizeof(router)) < 0) { |
| 526 | perror(host); |
| 527 | return -1; |
| 528 | } |
| 529 | |
| 530 | return 0; |
| 531 | } |
| 532 | |
| 533 | |
| 534 | /* |
| 535 | * Convert string to printable characters |
| 536 | */ |
| 537 | static char * |
| 538 | qstring(u_char *s, int len) |
| 539 | { |
| 540 | static char buf[8*20+1]; |
| 541 | char *p; |
| 542 | u_char *s2, c; |
| 543 | |
| 544 | |
| 545 | for (p = buf; len != 0 && p < &buf[sizeof(buf)-1]; len--) { |
| 546 | c = *s++; |
| 547 | if (c == '\0') { |
| 548 | for (s2 = s+1; s2 < &s[len]; s2++) { |
| 549 | if (*s2 != '\0') |
| 550 | break; |
| 551 | } |
| 552 | if (s2 >= &s[len]) |
| 553 | goto exit; |
| 554 | } |
| 555 | |
| 556 | if (c >= ' ' && c < 0x7f && c != '\\') { |
| 557 | *p++ = c; |
| 558 | continue; |
| 559 | } |
| 560 | *p++ = '\\'; |
| 561 | switch (c) { |
| 562 | case '\\': |
| 563 | *p++ = '\\'; |
| 564 | break; |
| 565 | case '\n': |
| 566 | *p++= 'n'; |
| 567 | break; |
| 568 | case '\r': |
| 569 | *p++= 'r'; |
| 570 | break; |
| 571 | case '\t': |
| 572 | *p++ = 't'; |
| 573 | break; |
| 574 | case '\b': |
| 575 | *p++ = 'b'; |
| 576 | break; |
| 577 | default: |
| 578 | p += sprintf(p,"%o",c); |
| 579 | break; |
| 580 | } |
| 581 | } |
| 582 | exit: |
| 583 | *p = '\0'; |
| 584 | return buf; |
| 585 | } |
| 586 | |
| 587 | |
| 588 | /* |
| 589 | * Handle an incoming RIP packet. |
| 590 | */ |
| 591 | static void |
| 592 | rip_input(struct sockaddr_in *from, |
| 593 | int size) |
| 594 | { |
| 595 | struct netinfo *n, *lim; |
| 596 | struct in_addr in; |
| 597 | const char *name; |
| 598 | char net_buf[80]; |
| 599 | u_char hash[RIP_AUTH_MD5_LEN]; |
| 600 | MD5_CTX md5_ctx; |
| 601 | u_char md5_authed = 0; |
| 602 | u_int mask, dmask; |
| 603 | char *sp; |
| 604 | int i; |
| 605 | struct hostent *hp; |
| 606 | struct netent *np; |
| 607 | struct netauth *na; |
| 608 | |
| 609 | |
| 610 | if (nflag) { |
| 611 | printf("%s:", inet_ntoa(from->sin_addr)); |
| 612 | } else { |
| 613 | hp = gethostbyaddr(&from->sin_addr, sizeof(struct in_addr), |
| 614 | AF_INET); |
| 615 | if (hp == 0) { |
| 616 | printf("%s:", |
| 617 | inet_ntoa(from->sin_addr)); |
| 618 | } else { |
| 619 | printf("%s (%s):", hp->h_name, |
| 620 | inet_ntoa(from->sin_addr)); |
| 621 | } |
| 622 | } |
| 623 | if (IMSG.rip_cmd != RIPCMD_RESPONSE) { |
| 624 | printf("\n unexpected response type %d\n", IMSG.rip_cmd); |
| 625 | return; |
| 626 | } |
| 627 | printf(" RIPv%d%s %d bytes\n", IMSG.rip_vers, |
| 628 | (IMSG.rip_vers != RIPv1 && IMSG.rip_vers != RIPv2) ? " ?" : "", |
| 629 | size); |
| 630 | if (size > MAXPACKETSIZE) { |
| 631 | if (size > (int)sizeof(imsg_buf) - (int)sizeof(*n)) { |
| 632 | printf(" at least %d bytes too long\n", |
| 633 | size-MAXPACKETSIZE); |
| 634 | size = (int)sizeof(imsg_buf) - (int)sizeof(*n); |
| 635 | } else { |
| 636 | printf(" %d bytes too long\n", |
| 637 | size-MAXPACKETSIZE); |
| 638 | } |
| 639 | } else if (size%sizeof(*n) != sizeof(struct rip)%sizeof(*n)) { |
| 640 | printf(" response of bad length=%d\n", size); |
| 641 | } |
| 642 | |
| 643 | n = IMSG.rip_nets; |
| 644 | lim = (struct netinfo *)((char*)n + size) - 1; |
| 645 | for (; n <= lim; n++) { |
| 646 | name = ""; |
| 647 | if (n->n_family == RIP_AF_INET) { |
| 648 | in.s_addr = n->n_dst; |
| 649 | strcpy(net_buf, inet_ntoa(in)); |
| 650 | |
| 651 | mask = ntohl(n->n_mask); |
| 652 | dmask = mask & -mask; |
| 653 | if (mask != 0) { |
| 654 | sp = &net_buf[strlen(net_buf)]; |
| 655 | if (IMSG.rip_vers == RIPv1) { |
| 656 | sprintf(sp," mask=%#x ? ",mask); |
| 657 | mask = 0; |
| 658 | } else if (mask + dmask == 0) { |
| 659 | for (i = 0; |
| 660 | (i != 32 |
| 661 | && ((1<<i)&mask) == 0); |
| 662 | i++) |
| 663 | continue; |
| 664 | sprintf(sp, "/%d",32-i); |
| 665 | } else { |
| 666 | sprintf(sp," (mask %#x)", mask); |
| 667 | } |
| 668 | } |
| 669 | |
| 670 | if (!nflag) { |
| 671 | if (mask == 0) { |
| 672 | mask = std_mask(in.s_addr); |
| 673 | if ((ntohl(in.s_addr) & ~mask) != 0) |
| 674 | mask = 0; |
| 675 | } |
| 676 | /* Without a netmask, do not worry about |
| 677 | * whether the destination is a host or a |
| 678 | * network. Try both and use the first name |
| 679 | * we get. |
| 680 | * |
| 681 | * If we have a netmask we can make a |
| 682 | * good guess. |
| 683 | */ |
| 684 | if ((in.s_addr & ~mask) == 0) { |
| 685 | np = getnetbyaddr((long)in.s_addr, |
| 686 | AF_INET); |
| 687 | if (np != 0) |
| 688 | name = np->n_name; |
| 689 | else if (in.s_addr == 0) |
| 690 | name = "default"; |
| 691 | } |
| 692 | if (name[0] == '\0' |
| 693 | && ((in.s_addr & ~mask) != 0 |
| 694 | || mask == 0xffffffff)) { |
| 695 | hp = gethostbyaddr(&in, sizeof(in), |
| 696 | AF_INET); |
| 697 | if (hp != 0) |
| 698 | name = hp->h_name; |
| 699 | } |
| 700 | } |
| 701 | |
| 702 | } else if (n->n_family == RIP_AF_AUTH) { |
| 703 | na = (struct netauth*)n; |
| 704 | if (na->a_type == RIP_AUTH_PW |
| 705 | && n == IMSG.rip_nets) { |
| 706 | printf(" Password Authentication: \"%s\"\n", |
| 707 | qstring(na->au.au_pw, RIP_AUTH_PW_LEN)); |
| 708 | continue; |
| 709 | } |
| 710 | |
| 711 | if (na->a_type == RIP_AUTH_MD5 |
| 712 | && n == IMSG.rip_nets) { |
| 713 | printf(" MD5 Auth" |
| 714 | " len=%d KeyID=%d" |
| 715 | " auth_len=%d" |
| 716 | " seqno=%#x" |
| 717 | " rsvd=%#x,%#x\n", |
| 718 | ntohs(na->au.a_md5.md5_pkt_len), |
| 719 | na->au.a_md5.md5_keyid, |
| 720 | na->au.a_md5.md5_auth_len, |
| 721 | (int)ntohl(na->au.a_md5.md5_seqno), |
| 722 | na->au.a_md5.rsvd[0], |
| 723 | na->au.a_md5.rsvd[1]); |
| 724 | md5_authed = 1; |
| 725 | continue; |
| 726 | } |
| 727 | printf(" Authentication type %d: ", ntohs(na->a_type)); |
| 728 | for (i = 0; i < (int)sizeof(na->au.au_pw); i++) |
| 729 | printf("%02x ", na->au.au_pw[i]); |
| 730 | putc('\n', stdout); |
| 731 | if (md5_authed && n+1 > lim |
| 732 | && na->a_type == ntohs(1)) { |
| 733 | MD5Init(&md5_ctx); |
| 734 | MD5Update(&md5_ctx, (u_char *)&IMSG, |
| 735 | (char *)na-(char *)&IMSG); |
| 736 | MD5Update(&md5_ctx, (u_char *)passwd, |
| 737 | RIP_AUTH_MD5_LEN); |
| 738 | MD5Final(hash, &md5_ctx); |
| 739 | printf(" %s hash\n", |
| 740 | memcmp(hash, na->au.au_pw, sizeof(hash)) |
| 741 | ? "WRONG" : "correct"); |
| 742 | } |
| 743 | continue; |
| 744 | |
| 745 | } else { |
| 746 | sprintf(net_buf, "(af %#x) %d.%d.%d.%d", |
| 747 | ntohs(n->n_family), |
| 748 | (char)(n->n_dst >> 24), |
| 749 | (char)(n->n_dst >> 16), |
| 750 | (char)(n->n_dst >> 8), |
| 751 | (char)n->n_dst); |
| 752 | } |
| 753 | |
| 754 | printf(" %-18s metric %2d %-10s", |
| 755 | net_buf, (int)ntohl(n->n_metric), name); |
| 756 | |
| 757 | if (n->n_nhop != 0) { |
| 758 | in.s_addr = n->n_nhop; |
| 759 | if (nflag) |
| 760 | hp = 0; |
| 761 | else |
| 762 | hp = gethostbyaddr(&in, sizeof(in), AF_INET); |
| 763 | printf(" nhop=%-15s%s", |
| 764 | (hp != 0) ? hp->h_name : inet_ntoa(in), |
| 765 | (IMSG.rip_vers == RIPv1) ? " ?" : ""); |
| 766 | } |
| 767 | if (n->n_tag != 0) |
| 768 | printf(" tag=%#x%s", n->n_tag, |
| 769 | (IMSG.rip_vers == RIPv1) ? " ?" : ""); |
| 770 | putc('\n', stdout); |
| 771 | } |
| 772 | } |
| 773 | |
| 774 | |
| 775 | /* Return the classical netmask for an IP address. |
| 776 | */ |
| 777 | static u_int |
| 778 | std_mask(u_int addr) /* in network order */ |
| 779 | { |
| 780 | addr = ntohl(addr); /* was a host, not a network */ |
| 781 | |
| 782 | if (addr == 0) /* default route has mask 0 */ |
| 783 | return 0; |
| 784 | if (IN_CLASSA(addr)) |
| 785 | return IN_CLASSA_NET; |
| 786 | if (IN_CLASSB(addr)) |
| 787 | return IN_CLASSB_NET; |
| 788 | return IN_CLASSC_NET; |
| 789 | } |
| 790 | |
| 791 | |
| 792 | /* get a network number as a name or a number, with an optional "/xx" |
| 793 | * netmask. |
| 794 | */ |
| 795 | static int /* 0=bad */ |
| 796 | getnet(char *name, |
| 797 | struct netinfo *rt) |
| 798 | { |
| 799 | int i; |
| 800 | struct netent *nentp; |
| 801 | u_int mask; |
| 802 | struct in_addr in; |
| 803 | char hname[MAXHOSTNAMELEN+1]; |
| 804 | char *mname, *p; |
| 805 | |
| 806 | |
| 807 | /* Detect and separate "1.2.3.4/24" |
| 808 | */ |
| 809 | if (0 != (mname = strrchr(name,'/'))) { |
| 810 | i = (int)(mname - name); |
| 811 | if (i > (int)sizeof(hname)-1) /* name too long */ |
| 812 | return 0; |
| 813 | memmove(hname, name, i); |
| 814 | hname[i] = '\0'; |
| 815 | mname++; |
| 816 | name = hname; |
| 817 | } |
| 818 | |
| 819 | nentp = getnetbyname(name); |
| 820 | if (nentp != 0) { |
| 821 | in.s_addr = nentp->n_net; |
| 822 | } else if (inet_aton(name, &in) == 1) { |
| 823 | in.s_addr = ntohl(in.s_addr); |
| 824 | } else { |
| 825 | return 0; |
| 826 | } |
| 827 | |
| 828 | if (mname == 0) { |
| 829 | mask = std_mask(in.s_addr); |
| 830 | if ((~mask & in.s_addr) != 0) |
| 831 | mask = 0xffffffff; |
| 832 | } else { |
| 833 | mask = (u_int)strtoul(mname, &p, 0); |
| 834 | if (*p != '\0' || mask > 32) |
| 835 | return 0; |
| 836 | mask = 0xffffffff << (32-mask); |
| 837 | } |
| 838 | |
| 839 | rt->n_dst = htonl(in.s_addr); |
| 840 | rt->n_family = RIP_AF_INET; |
| 841 | rt->n_mask = htonl(mask); |
| 842 | return 1; |
| 843 | } |
| 844 | |
| 845 | |
| 846 | /* strtok(), but honoring backslash |
| 847 | */ |
| 848 | static int /* -1=bad */ |
| 849 | parse_quote(char **linep, |
| 850 | const char *delims, |
| 851 | char *delimp, |
| 852 | char *buf, |
| 853 | int lim) |
| 854 | { |
| 855 | char c, *pc; |
| 856 | const char *p; |
| 857 | |
| 858 | |
| 859 | pc = *linep; |
| 860 | if (*pc == '\0') |
| 861 | return -1; |
| 862 | |
| 863 | for (;;) { |
| 864 | if (lim == 0) |
| 865 | return -1; |
| 866 | c = *pc++; |
| 867 | if (c == '\0') |
| 868 | break; |
| 869 | |
| 870 | if (c == '\\' && *pc != '\0') { |
| 871 | if ((c = *pc++) == 'n') { |
| 872 | c = '\n'; |
| 873 | } else if (c == 'r') { |
| 874 | c = '\r'; |
| 875 | } else if (c == 't') { |
| 876 | c = '\t'; |
| 877 | } else if (c == 'b') { |
| 878 | c = '\b'; |
| 879 | } else if (c >= '0' && c <= '7') { |
| 880 | c -= '0'; |
| 881 | if (*pc >= '0' && *pc <= '7') { |
| 882 | c = (c<<3)+(*pc++ - '0'); |
| 883 | if (*pc >= '0' && *pc <= '7') |
| 884 | c = (c<<3)+(*pc++ - '0'); |
| 885 | } |
| 886 | } |
| 887 | |
| 888 | } else { |
| 889 | for (p = delims; *p != '\0'; ++p) { |
| 890 | if (*p == c) |
| 891 | goto exit; |
| 892 | } |
| 893 | } |
| 894 | |
| 895 | *buf++ = c; |
| 896 | --lim; |
| 897 | } |
| 898 | exit: |
| 899 | if (delimp != 0) |
| 900 | *delimp = c; |
| 901 | *linep = pc-1; |
| 902 | if (lim != 0) |
| 903 | *buf = '\0'; |
| 904 | return 0; |
| 905 | } |