rtquery.c revision 1.14 1 /* $NetBSD: rtquery.c,v 1.14 2001/03/10 23:52:47 christos Exp $ */
2
3 /*-
4 * Copyright (c) 1982, 1986, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgment:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <sys/param.h>
37 #include <sys/protosw.h>
38 #include <sys/socket.h>
39 #include <sys/time.h>
40 #include <netinet/in.h>
41 #define RIPVERSION RIPv2
42 #include <protocols/routed.h>
43 #include <arpa/inet.h>
44 #include <netdb.h>
45 #include <errno.h>
46 #include <unistd.h>
47 #include <stdio.h>
48 #include <stdlib.h>
49 #include <string.h>
50 #ifdef sgi
51 #include <strings.h>
52 #include <bstring.h>
53 #endif
54
55 #define UNUSED __attribute__((unused))
56 #ifndef __RCSID
57 #define __RCSID(_s) static const char rcsid[] UNUSED = _s
58 #endif
59 #ifndef __COPYRIGHT
60 #define __COPYRIGHT(_s) static const char copyright[] UNUSED = _s
61 #endif
62 __COPYRIGHT("@(#) Copyright (c) 1983, 1988, 1993\n"
63 "The Regents of the University of California."
64 " All rights reserved.\n");
65 #ifdef __NetBSD__
66 __RCSID("$NetBSD: rtquery.c,v 1.14 2001/03/10 23:52:47 christos Exp $");
67 #elif defined(__FreeBSD__)
68 __RCSID("$FreeBSD$");
69 #else
70 __RCSID("Revision: 2.23 ");
71 #ident "Revision: 2.23 "
72 #endif
73 #include <md5.h>
74
75 #ifndef sgi
76 #define _HAVE_SIN_LEN
77 #endif
78
79 #define WTIME 15 /* Time to wait for all responses */
80 #define STIME (250*1000) /* usec to wait for another response */
81
82 int soc;
83
84 const char *pgmname;
85
86 union {
87 struct rip rip;
88 char packet[MAXPACKETSIZE+MAXPATHLEN];
89 } omsg_buf;
90 #define OMSG omsg_buf.rip
91 int omsg_len = sizeof(struct rip);
92
93 union {
94 struct rip rip;
95 char packet[MAXPACKETSIZE+1024];
96 } imsg_buf;
97 #define IMSG imsg_buf.rip
98
99 int nflag; /* numbers, no names */
100 int pflag; /* play the `gated` game */
101 int ripv2 = 1; /* use RIP version 2 */
102 int wtime = WTIME;
103 int rflag; /* 1=ask about a particular route */
104 int trace, not_trace; /* send trace command or not */
105 int auth_type = RIP_AUTH_NONE;
106 char passwd[RIP_AUTH_PW_LEN];
107 u_long keyid;
108
109 struct timeval sent; /* when query sent */
110
111 static char localhost_str[] = "localhost";
112 static char *default_argv[] = {localhost_str, 0};
113
114 static void rip_input(struct sockaddr_in*, int);
115 static int out(const char *);
116 static void trace_loop(char *argv[]) __attribute((__noreturn__));
117 static void query_loop(char *argv[], int) __attribute((__noreturn__));
118 static int getnet(char *, struct netinfo *);
119 static u_int std_mask(u_int);
120 static int parse_quote(char **, const char *, char *, char *, int);
121 static void usage(void);
122
123
124 int
125 main(int argc,
126 char *argv[])
127 {
128 int ch, bsize;
129 char *p, *options, *value, delim;
130 const char *result;
131
132 OMSG.rip_nets[0].n_dst = RIP_DEFAULT;
133 OMSG.rip_nets[0].n_family = RIP_AF_UNSPEC;
134 OMSG.rip_nets[0].n_metric = htonl(HOPCNT_INFINITY);
135
136 pgmname = argv[0];
137 while ((ch = getopt(argc, argv, "np1w:r:t:a:")) != -1)
138 switch (ch) {
139 case 'n':
140 not_trace = 1;
141 nflag = 1;
142 break;
143
144 case 'p':
145 not_trace = 1;
146 pflag = 1;
147 break;
148
149 case '1':
150 ripv2 = 0;
151 break;
152
153 case 'w':
154 not_trace = 1;
155 wtime = (int)strtoul(optarg, &p, 0);
156 if (*p != '\0'
157 || wtime <= 0)
158 usage();
159 break;
160
161 case 'r':
162 not_trace = 1;
163 if (rflag)
164 usage();
165 rflag = getnet(optarg, &OMSG.rip_nets[0]);
166 if (!rflag) {
167 struct hostent *hp = gethostbyname(optarg);
168 if (hp == 0) {
169 fprintf(stderr, "%s: %s:",
170 pgmname, optarg);
171 herror(0);
172 exit(1);
173 }
174 memcpy(&OMSG.rip_nets[0].n_dst, hp->h_addr,
175 sizeof(OMSG.rip_nets[0].n_dst));
176 OMSG.rip_nets[0].n_family = RIP_AF_INET;
177 OMSG.rip_nets[0].n_mask = -1;
178 rflag = 1;
179 }
180 break;
181
182 case 't':
183 trace = 1;
184 options = optarg;
185 while (*options != '\0') {
186 /* messy complications to make -W -Wall happy */
187 static char on_str[] = "on";
188 static char more_str[] = "more";
189 static char off_str[] = "off";
190 static char dump_str[] = "dump";
191 static char *traceopts[] = {
192 # define TRACE_ON 0
193 on_str,
194 # define TRACE_MORE 1
195 more_str,
196 # define TRACE_OFF 2
197 off_str,
198 # define TRACE_DUMP 3
199 dump_str,
200 0
201 };
202 result = "";
203 switch (getsubopt(&options,traceopts,&value)) {
204 case TRACE_ON:
205 OMSG.rip_cmd = RIPCMD_TRACEON;
206 if (!value
207 || strlen(value) > MAXPATHLEN)
208 usage();
209 result = value;
210 break;
211 case TRACE_MORE:
212 if (value)
213 usage();
214 OMSG.rip_cmd = RIPCMD_TRACEON;
215 break;
216 case TRACE_OFF:
217 if (value)
218 usage();
219 OMSG.rip_cmd = RIPCMD_TRACEOFF;
220 break;
221 case TRACE_DUMP:
222 if (value)
223 usage();
224 OMSG.rip_cmd = RIPCMD_TRACEON;
225 result = "dump/../table";
226 break;
227 default:
228 usage();
229 }
230 strcpy((char*)OMSG.rip_tracefile, result);
231 omsg_len += strlen(result) - sizeof(OMSG.ripun);
232 }
233 break;
234
235 case 'a':
236 not_trace = 1;
237 p = strchr(optarg,'=');
238 if (!p)
239 usage();
240 *p++ = '\0';
241 if (!strcasecmp("passwd",optarg))
242 auth_type = RIP_AUTH_PW;
243 else if (!strcasecmp("md5_passwd",optarg))
244 auth_type = RIP_AUTH_MD5;
245 else
246 usage();
247 if (0 > parse_quote(&p,"|",&delim,
248 passwd, sizeof(passwd)))
249 usage();
250 if (auth_type == RIP_AUTH_MD5
251 && delim == '|') {
252 keyid = strtoul(p+1,&p,0);
253 if (keyid > 255 || *p != '\0')
254 usage();
255 } else if (delim != '\0') {
256 usage();
257 }
258 break;
259
260 default:
261 usage();
262 }
263 argv += optind;
264 argc -= optind;
265 if (not_trace && trace)
266 usage();
267 if (argc == 0) {
268 argc = 1;
269 argv = default_argv;
270 }
271
272 soc = socket(AF_INET, SOCK_DGRAM, 0);
273 if (soc < 0) {
274 perror("socket");
275 exit(2);
276 }
277
278 /* be prepared to receive a lot of routes */
279 for (bsize = 127*1024; ; bsize -= 1024) {
280 if (setsockopt(soc, SOL_SOCKET, SO_RCVBUF,
281 &bsize, sizeof(bsize)) == 0)
282 break;
283 if (bsize <= 4*1024) {
284 perror("setsockopt SO_RCVBUF");
285 break;
286 }
287 }
288
289 if (trace)
290 trace_loop(argv);
291 else
292 query_loop(argv, argc);
293 /* NOTREACHED */
294 return 0;
295 }
296
297
298 static void
299 usage(void)
300 {
301 fprintf(stderr,
302 "usage: rtquery [-np1] [-r tgt_rt] [-w wtime]"
303 " [-a type=passwd] host1 [host2 ...]\n"
304 "\trtquery -t {on=filename|more|off|dump}"
305 " host1 [host2 ...]\n");
306 exit(1);
307 }
308
309
310 /* tell the target hosts about tracing
311 */
312 static void
313 trace_loop(char *argv[])
314 {
315 struct sockaddr_in myaddr;
316 int res;
317
318 if (geteuid() != 0) {
319 (void)fprintf(stderr, "-t requires UID 0\n");
320 exit(1);
321 }
322
323 if (ripv2) {
324 OMSG.rip_vers = RIPv2;
325 } else {
326 OMSG.rip_vers = RIPv1;
327 }
328
329 memset(&myaddr, 0, sizeof(myaddr));
330 myaddr.sin_family = AF_INET;
331 #ifdef _HAVE_SIN_LEN
332 myaddr.sin_len = sizeof(myaddr);
333 #endif
334 myaddr.sin_port = htons(IPPORT_RESERVED-1);
335 while (bind(soc, (struct sockaddr *)&myaddr, sizeof(myaddr)) < 0) {
336 if (errno != EADDRINUSE
337 || myaddr.sin_port == 0) {
338 perror("bind");
339 exit(2);
340 }
341 myaddr.sin_port = htons(ntohs(myaddr.sin_port)-1);
342 }
343
344 res = 1;
345 while (*argv != 0) {
346 if (out(*argv++) <= 0)
347 res = 0;
348 }
349 exit(res);
350 }
351
352
353 /* query all of the listed hosts
354 */
355 static void
356 query_loop(char *argv[], int argc)
357 {
358 # define NA0 (OMSG.rip_auths[0])
359 # define NA2 (OMSG.rip_auths[2])
360 struct seen {
361 struct seen *next;
362 struct in_addr addr;
363 } *seen, *sp;
364 int answered = 0;
365 int cc;
366 fd_set bits;
367 struct timeval now, delay;
368 struct sockaddr_in from;
369 int fromlen;
370 MD5_CTX md5_ctx;
371
372
373 OMSG.rip_cmd = (pflag) ? RIPCMD_POLL : RIPCMD_REQUEST;
374 if (ripv2) {
375 OMSG.rip_vers = RIPv2;
376 if (auth_type == RIP_AUTH_PW) {
377 OMSG.rip_nets[1] = OMSG.rip_nets[0];
378 NA0.a_family = RIP_AF_AUTH;
379 NA0.a_type = RIP_AUTH_PW;
380 memcpy(NA0.au.au_pw, passwd, RIP_AUTH_PW_LEN);
381 omsg_len += sizeof(OMSG.rip_nets[0]);
382
383 } else if (auth_type == RIP_AUTH_MD5) {
384 OMSG.rip_nets[1] = OMSG.rip_nets[0];
385 NA0.a_family = RIP_AF_AUTH;
386 NA0.a_type = RIP_AUTH_MD5;
387 NA0.au.a_md5.md5_keyid = (int8_t)keyid;
388 NA0.au.a_md5.md5_auth_len = RIP_AUTH_MD5_LEN;
389 NA0.au.a_md5.md5_seqno = 0;
390 cc = (char *)&NA2-(char *)&OMSG;
391 NA0.au.a_md5.md5_pkt_len = htons(cc);
392 NA2.a_family = RIP_AF_AUTH;
393 NA2.a_type = htons(1);
394 MD5Init(&md5_ctx);
395 MD5Update(&md5_ctx,
396 (u_char *)&OMSG, cc);
397 MD5Update(&md5_ctx,
398 (u_char *)passwd, RIP_AUTH_MD5_LEN);
399 MD5Final(NA2.au.au_pw, &md5_ctx);
400 omsg_len += 2*sizeof(OMSG.rip_nets[0]);
401 }
402
403 } else {
404 OMSG.rip_vers = RIPv1;
405 OMSG.rip_nets[0].n_mask = 0;
406 }
407
408 /* ask the first (valid) host */
409 seen = 0;
410 while (0 > out(*argv++)) {
411 if (*argv == 0)
412 exit(-1);
413 answered++;
414 }
415
416 FD_ZERO(&bits);
417 for (;;) {
418 FD_SET(soc, &bits);
419 delay.tv_sec = 0;
420 delay.tv_usec = STIME;
421 cc = select(soc+1, &bits, 0,0, &delay);
422 if (cc > 0) {
423 fromlen = sizeof(from);
424 cc = recvfrom(soc, imsg_buf.packet,
425 sizeof(imsg_buf.packet), 0,
426 (struct sockaddr *)&from, &fromlen);
427 if (cc < 0) {
428 perror("recvfrom");
429 exit(1);
430 }
431 /* count the distinct responding hosts.
432 * You cannot match responding hosts with
433 * addresses to which queries were transmitted,
434 * because a router might respond with a
435 * different source address.
436 */
437 for (sp = seen; sp != 0; sp = sp->next) {
438 if (sp->addr.s_addr == from.sin_addr.s_addr)
439 break;
440 }
441 if (sp == 0) {
442 sp = malloc(sizeof(*sp));
443 if (sp == 0) {
444 fprintf(stderr,
445 "rtquery: malloc failed\n");
446 exit(1);
447 }
448 sp->addr = from.sin_addr;
449 sp->next = seen;
450 seen = sp;
451 answered++;
452 }
453
454 rip_input(&from, cc);
455 continue;
456 }
457
458 if (cc < 0) {
459 if (errno == EINTR)
460 continue;
461 perror("select");
462 exit(1);
463 }
464
465 /* After a pause in responses, probe another host.
466 * This reduces the intermingling of answers.
467 */
468 while (*argv != 0 && 0 > out(*argv++))
469 answered++;
470
471 /* continue until no more packets arrive
472 * or we have heard from all hosts
473 */
474 if (answered >= argc)
475 break;
476
477 /* or until we have waited a long time
478 */
479 if (gettimeofday(&now, 0) < 0) {
480 perror("gettimeofday(now)");
481 exit(1);
482 }
483 if (sent.tv_sec + wtime <= now.tv_sec)
484 break;
485 }
486
487 /* fail if there was no answer */
488 exit (answered >= argc ? 0 : 1);
489 }
490
491
492 /* send to one host
493 */
494 static int
495 out(const char *host)
496 {
497 struct sockaddr_in router;
498 struct hostent *hp;
499
500 if (gettimeofday(&sent, 0) < 0) {
501 perror("gettimeofday(sent)");
502 return -1;
503 }
504
505 memset(&router, 0, sizeof(router));
506 router.sin_family = AF_INET;
507 #ifdef _HAVE_SIN_LEN
508 router.sin_len = sizeof(router);
509 #endif
510 if (!inet_aton(host, &router.sin_addr)) {
511 hp = gethostbyname(host);
512 if (hp == 0) {
513 herror(host);
514 return -1;
515 }
516 memcpy(&router.sin_addr, hp->h_addr, sizeof(router.sin_addr));
517 }
518 router.sin_port = htons(RIP_PORT);
519
520 if (sendto(soc, &omsg_buf, omsg_len, 0,
521 (struct sockaddr *)&router, sizeof(router)) < 0) {
522 perror(host);
523 return -1;
524 }
525
526 return 0;
527 }
528
529
530 /*
531 * Convert string to printable characters
532 */
533 static char *
534 qstring(u_char *s, int len)
535 {
536 static char buf[8*20+1];
537 char *p;
538 u_char *s2, c;
539
540
541 for (p = buf; len != 0 && p < &buf[sizeof(buf)-1]; len--) {
542 c = *s++;
543 if (c == '\0') {
544 for (s2 = s+1; s2 < &s[len]; s2++) {
545 if (*s2 != '\0')
546 break;
547 }
548 if (s2 >= &s[len])
549 goto exit;
550 }
551
552 if (c >= ' ' && c < 0x7f && c != '\\') {
553 *p++ = c;
554 continue;
555 }
556 *p++ = '\\';
557 switch (c) {
558 case '\\':
559 *p++ = '\\';
560 break;
561 case '\n':
562 *p++= 'n';
563 break;
564 case '\r':
565 *p++= 'r';
566 break;
567 case '\t':
568 *p++ = 't';
569 break;
570 case '\b':
571 *p++ = 'b';
572 break;
573 default:
574 p += sprintf(p,"%o",c);
575 break;
576 }
577 }
578 exit:
579 *p = '\0';
580 return buf;
581 }
582
583
584 /*
585 * Handle an incoming RIP packet.
586 */
587 static void
588 rip_input(struct sockaddr_in *from,
589 int size)
590 {
591 struct netinfo *n, *lim;
592 struct in_addr in;
593 const char *name;
594 char net_buf[80];
595 u_char hash[RIP_AUTH_MD5_LEN];
596 MD5_CTX md5_ctx;
597 u_char md5_authed = 0;
598 u_int mask, dmask;
599 char *sp;
600 int i;
601 struct hostent *hp;
602 struct netent *np;
603 struct netauth *na;
604
605
606 if (nflag) {
607 printf("%s:", inet_ntoa(from->sin_addr));
608 } else {
609 hp = gethostbyaddr((char*)&from->sin_addr,
610 sizeof(struct in_addr), AF_INET);
611 if (hp == 0) {
612 printf("%s:",
613 inet_ntoa(from->sin_addr));
614 } else {
615 printf("%s (%s):", hp->h_name,
616 inet_ntoa(from->sin_addr));
617 }
618 }
619 if (IMSG.rip_cmd != RIPCMD_RESPONSE) {
620 printf("\n unexpected response type %d\n", IMSG.rip_cmd);
621 return;
622 }
623 printf(" RIPv%d%s %d bytes\n", IMSG.rip_vers,
624 (IMSG.rip_vers != RIPv1 && IMSG.rip_vers != RIPv2) ? " ?" : "",
625 size);
626 if (size > MAXPACKETSIZE) {
627 if (size > (int)sizeof(imsg_buf) - (int)sizeof(*n)) {
628 printf(" at least %d bytes too long\n",
629 size-MAXPACKETSIZE);
630 size = (int)sizeof(imsg_buf) - (int)sizeof(*n);
631 } else {
632 printf(" %d bytes too long\n",
633 size-MAXPACKETSIZE);
634 }
635 } else if (size%sizeof(*n) != sizeof(struct rip)%sizeof(*n)) {
636 printf(" response of bad length=%d\n", size);
637 }
638
639 n = IMSG.rip_nets;
640 lim = (struct netinfo *)((char*)n + size) - 1;
641 for (; n <= lim; n++) {
642 name = "";
643 if (n->n_family == RIP_AF_INET) {
644 in.s_addr = n->n_dst;
645 (void)strcpy(net_buf, inet_ntoa(in));
646
647 mask = ntohl(n->n_mask);
648 dmask = mask & -mask;
649 if (mask != 0) {
650 sp = &net_buf[strlen(net_buf)];
651 if (IMSG.rip_vers == RIPv1) {
652 (void)sprintf(sp," mask=%#x ? ",mask);
653 mask = 0;
654 } else if (mask + dmask == 0) {
655 for (i = 0;
656 (i != 32
657 && ((1<<i)&mask) == 0);
658 i++)
659 continue;
660 (void)sprintf(sp, "/%d",32-i);
661 } else {
662 (void)sprintf(sp," (mask %#x)", mask);
663 }
664 }
665
666 if (!nflag) {
667 if (mask == 0) {
668 mask = std_mask(in.s_addr);
669 if ((ntohl(in.s_addr) & ~mask) != 0)
670 mask = 0;
671 }
672 /* Without a netmask, do not worry about
673 * whether the destination is a host or a
674 * network. Try both and use the first name
675 * we get.
676 *
677 * If we have a netmask we can make a
678 * good guess.
679 */
680 if ((in.s_addr & ~mask) == 0) {
681 np = getnetbyaddr((long)in.s_addr,
682 AF_INET);
683 if (np != 0)
684 name = np->n_name;
685 else if (in.s_addr == 0)
686 name = "default";
687 }
688 if (name[0] == '\0'
689 && ((in.s_addr & ~mask) != 0
690 || mask == 0xffffffff)) {
691 hp = gethostbyaddr((char*)&in,
692 sizeof(in),
693 AF_INET);
694 if (hp != 0)
695 name = hp->h_name;
696 }
697 }
698
699 } else if (n->n_family == RIP_AF_AUTH) {
700 na = (struct netauth*)n;
701 if (na->a_type == RIP_AUTH_PW
702 && n == IMSG.rip_nets) {
703 (void)printf(" Password Authentication:"
704 " \"%s\"\n",
705 qstring(na->au.au_pw,
706 RIP_AUTH_PW_LEN));
707 continue;
708 }
709
710 if (na->a_type == RIP_AUTH_MD5
711 && n == IMSG.rip_nets) {
712 (void)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 (void)printf(" Authentication type %d: ",
727 ntohs(na->a_type));
728 for (i = 0; i < (int)sizeof(na->au.au_pw); i++)
729 (void)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 (void)printf(" %s hash\n",
740 memcmp(hash, na->au.au_pw,
741 sizeof(hash))
742 ? "WRONG" : "correct");
743 }
744 continue;
745
746 } else {
747 (void)sprintf(net_buf, "(af %#x) %d.%d.%d.%d",
748 ntohs(n->n_family),
749 (unsigned char)(n->n_dst >> 24),
750 (unsigned char)(n->n_dst >> 16),
751 (unsigned char)(n->n_dst >> 8),
752 (unsigned char)n->n_dst);
753 }
754
755 (void)printf(" %-18s metric %2d %-10s",
756 net_buf, (int)ntohl(n->n_metric), name);
757
758 if (n->n_nhop != 0) {
759 in.s_addr = n->n_nhop;
760 if (nflag)
761 hp = 0;
762 else
763 hp = gethostbyaddr((char*)&in, sizeof(in),
764 AF_INET);
765 (void)printf(" nhop=%-15s%s",
766 (hp != 0) ? hp->h_name : inet_ntoa(in),
767 (IMSG.rip_vers == RIPv1) ? " ?" : "");
768 }
769 if (n->n_tag != 0)
770 (void)printf(" tag=%#x%s", n->n_tag,
771 (IMSG.rip_vers == RIPv1) ? " ?" : "");
772 putc('\n', stdout);
773 }
774 }
775
776
777 /* Return the classical netmask for an IP address.
778 */
779 static u_int
780 std_mask(u_int addr) /* in network order */
781 {
782 NTOHL(addr); /* was a host, not a network */
783
784 if (addr == 0) /* default route has mask 0 */
785 return 0;
786 if (IN_CLASSA(addr))
787 return IN_CLASSA_NET;
788 if (IN_CLASSB(addr))
789 return IN_CLASSB_NET;
790 return IN_CLASSC_NET;
791 }
792
793
794 /* get a network number as a name or a number, with an optional "/xx"
795 * netmask.
796 */
797 static int /* 0=bad */
798 getnet(char *name,
799 struct netinfo *rt)
800 {
801 int i;
802 struct netent *nentp;
803 u_int mask;
804 struct in_addr in;
805 char hname[MAXHOSTNAMELEN+1];
806 char *mname, *p;
807
808
809 /* Detect and separate "1.2.3.4/24"
810 */
811 if (0 != (mname = strrchr(name,'/'))) {
812 i = (int)(mname - name);
813 if (i > (int)sizeof(hname)-1) /* name too long */
814 return 0;
815 memmove(hname, name, i);
816 hname[i] = '\0';
817 mname++;
818 name = hname;
819 }
820
821 nentp = getnetbyname(name);
822 if (nentp != 0) {
823 in.s_addr = nentp->n_net;
824 } else if (inet_aton(name, &in) == 1) {
825 NTOHL(in.s_addr);
826 } else {
827 return 0;
828 }
829
830 if (mname == 0) {
831 mask = std_mask(in.s_addr);
832 if ((~mask & in.s_addr) != 0)
833 mask = 0xffffffff;
834 } else {
835 mask = (u_int)strtoul(mname, &p, 0);
836 if (*p != '\0' || mask > 32)
837 return 0;
838 mask = 0xffffffff << (32-mask);
839 }
840
841 rt->n_dst = htonl(in.s_addr);
842 rt->n_family = RIP_AF_INET;
843 rt->n_mask = htonl(mask);
844 return 1;
845 }
846
847
848 /* strtok(), but honoring backslash
849 */
850 static int /* -1=bad */
851 parse_quote(char **linep,
852 const char *delims,
853 char *delimp,
854 char *buf,
855 int lim)
856 {
857 char c, *pc;
858 const char *p;
859
860
861 pc = *linep;
862 if (*pc == '\0')
863 return -1;
864
865 for (;;) {
866 if (lim == 0)
867 return -1;
868 c = *pc++;
869 if (c == '\0')
870 break;
871
872 if (c == '\\' && *pc != '\0') {
873 if ((c = *pc++) == 'n') {
874 c = '\n';
875 } else if (c == 'r') {
876 c = '\r';
877 } else if (c == 't') {
878 c = '\t';
879 } else if (c == 'b') {
880 c = '\b';
881 } else if (c >= '0' && c <= '7') {
882 c -= '0';
883 if (*pc >= '0' && *pc <= '7') {
884 c = (c<<3)+(*pc++ - '0');
885 if (*pc >= '0' && *pc <= '7')
886 c = (c<<3)+(*pc++ - '0');
887 }
888 }
889
890 } else {
891 for (p = delims; *p != '\0'; ++p) {
892 if (*p == c)
893 goto exit;
894 }
895 }
896
897 *buf++ = c;
898 --lim;
899 }
900 exit:
901 if (delimp != 0)
902 *delimp = c;
903 *linep = pc-1;
904 if (lim != 0)
905 *buf = '\0';
906 return 0;
907 }
908