rtquery.c revision 1.1.1.3 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 acknowledgement:
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
34 char copyright[] =
35 "@(#) Copyright (c) 1982, 1986, 1993\n\
36 The Regents of the University of California. All rights reserved.\n";
37
38 #if !defined(lint) && !defined(sgi) && !defined(__NetBSD__)
39 static char sccsid[] = "@(#)query.c 8.1 (Berkeley) 6/5/93";
40 #elif defined(__NetBSD__)
41 static char rcsid[] = "$NetBSD: rtquery.c,v 1.1.1.3 1997/02/03 21:06:47 christos Exp $";
42 #endif
43 #ident "$Revision: 1.1.1.3 $"
44
45 #include <sys/param.h>
46 #include <sys/protosw.h>
47 #include <sys/socket.h>
48 #include <sys/time.h>
49 #include <netinet/in.h>
50 #define RIPVERSION RIPv2
51 #include <protocols/routed.h>
52 #include <arpa/inet.h>
53 #include <netdb.h>
54 #include <errno.h>
55 #include <unistd.h>
56 #include <stdio.h>
57 #include <stdlib.h>
58 #include <string.h>
59 #ifdef sgi
60 #include <strings.h>
61 #include <bstring.h>
62 #endif
63
64 #ifndef sgi
65 #define _HAVE_SIN_LEN
66 #endif
67
68 #define MD5_DIGEST_LEN 16
69 typedef struct {
70 u_int32_t state[4]; /* state (ABCD) */
71 u_int32_t count[2]; /* # of bits, modulo 2^64 (LSB 1st) */
72 unsigned char buffer[64]; /* input buffer */
73 } MD5_CTX;
74 extern void MD5Init(MD5_CTX*);
75 extern void MD5Update(MD5_CTX*, u_char*, u_int);
76 extern void MD5Final(u_char[MD5_DIGEST_LEN], MD5_CTX*);
77
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 s;
83
84 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 void rip_input(struct sockaddr_in*, int);
112 static int out(char *);
113 static void trace_loop(char *argv[]);
114 static void query_loop(char *argv[], int);
115 static int getnet(char *, struct netinfo *);
116 static u_int std_mask(u_int);
117 static int parse_quote(char **, char *, char *, char *, int);
118
119
120 void
121 main(int argc,
122 char *argv[])
123 {
124 int ch, bsize;
125 char *p, *options, *value, delim;
126
127 OMSG.rip_nets[0].n_dst = RIP_DEFAULT;
128 OMSG.rip_nets[0].n_family = RIP_AF_UNSPEC;
129 OMSG.rip_nets[0].n_metric = htonl(HOPCNT_INFINITY);
130
131 pgmname = argv[0];
132 while ((ch = getopt(argc, argv, "np1w:r:t:a:")) != EOF)
133 switch (ch) {
134 case 'n':
135 not_trace = 1;
136 nflag = 1;
137 break;
138
139 case 'p':
140 not_trace = 1;
141 pflag = 1;
142 break;
143
144 case '1':
145 ripv2 = 0;
146 break;
147
148 case 'w':
149 not_trace = 1;
150 wtime = (int)strtoul(optarg, &p, 0);
151 if (*p != '\0'
152 || wtime <= 0)
153 goto usage;
154 break;
155
156 case 'r':
157 not_trace = 1;
158 if (rflag)
159 goto usage;
160 rflag = getnet(optarg, &OMSG.rip_nets[0]);
161 if (!rflag) {
162 struct hostent *hp = gethostbyname(optarg);
163 if (hp == 0) {
164 fprintf(stderr, "%s: %s:",
165 pgmname, optarg);
166 herror(0);
167 exit(1);
168 }
169 bcopy(hp->h_addr, &OMSG.rip_nets[0].n_dst,
170 sizeof(OMSG.rip_nets[0].n_dst));
171 OMSG.rip_nets[0].n_family = RIP_AF_INET;
172 OMSG.rip_nets[0].n_mask = -1;
173 rflag = 1;
174 }
175 break;
176
177 case 't':
178 trace = 1;
179 options = optarg;
180 while (*options != '\0') {
181 char *traceopts[] = {
182 # define TRACE_ON 0
183 "on",
184 # define TRACE_MORE 1
185 "more",
186 # define TRACE_OFF 2
187 "off",
188 # define TRACE_DUMP 3
189 "dump",
190 0
191 };
192 switch (getsubopt(&options,traceopts,&value)) {
193 case TRACE_ON:
194 OMSG.rip_cmd = RIPCMD_TRACEON;
195 if (!value
196 || strlen(value) > MAXPATHLEN)
197 goto usage;
198 break;
199 case TRACE_MORE:
200 if (value)
201 goto usage;
202 OMSG.rip_cmd = RIPCMD_TRACEON;
203 value = "";
204 break;
205 case TRACE_OFF:
206 if (value)
207 goto usage;
208 OMSG.rip_cmd = RIPCMD_TRACEOFF;
209 value = "";
210 break;
211 case TRACE_DUMP:
212 if (value)
213 goto usage;
214 OMSG.rip_cmd = RIPCMD_TRACEON;
215 value = "dump/../table";
216 break;
217 default:
218 goto usage;
219 }
220 strcpy((char*)OMSG.rip_tracefile, value);
221 omsg_len += strlen(value) - sizeof(OMSG.ripun);
222 }
223 break;
224
225 case 'a':
226 not_trace = 1;
227 p = strchr(optarg,'=');
228 if (!p)
229 goto usage;
230 *p++ = '\0';
231 if (!strcasecmp("passwd",optarg))
232 auth_type = RIP_AUTH_PW;
233 else if (!strcasecmp("md5_passwd",optarg))
234 auth_type = RIP_AUTH_MD5;
235 else
236 goto usage;
237 if (0 > parse_quote(&p,"|",&delim,
238 passwd,sizeof(passwd)))
239 goto usage;
240 if (auth_type == RIP_AUTH_MD5
241 && delim == '|') {
242 keyid = strtoul(p+1,&p,0);
243 if (keyid > 255 || *p != '\0')
244 goto usage;
245 } else if (delim != '\0') {
246 goto usage;
247 }
248 break;
249
250 default:
251 goto usage;
252 }
253 argv += optind;
254 argc -= optind;
255 if ((not_trace && trace) || argc == 0) {
256 usage: fprintf(stderr, "%s: [-np1v] [-r tgt_rt] [-w wtime]"
257 " [-a type=passwd] host1 [host2 ...]\n"
258 "or\t-t {on=filename|more|off|dump}"
259 " host1 [host2 ...]\n",
260 pgmname);
261 exit(1);
262 }
263
264 s = socket(AF_INET, SOCK_DGRAM, 0);
265 if (s < 0) {
266 perror("socket");
267 exit(2);
268 }
269
270 /* be prepared to receive a lot of routes */
271 for (bsize = 127*1024; ; bsize -= 1024) {
272 if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
273 &bsize, sizeof(bsize)) == 0)
274 break;
275 if (bsize <= 4*1024) {
276 perror("setsockopt SO_RCVBUF");
277 break;
278 }
279 }
280
281 if (trace)
282 trace_loop(argv);
283 else
284 query_loop(argv, argc);
285 /* NOTREACHED */
286 }
287
288
289 /* tell the target hosts about tracing
290 */
291 static void
292 trace_loop(char *argv[])
293 {
294 struct sockaddr_in myaddr;
295 int res;
296
297 if (geteuid() != 0) {
298 (void)fprintf(stderr, "-t requires UID 0\n");
299 exit(1);
300 }
301
302 if (ripv2) {
303 OMSG.rip_vers = RIPv2;
304 } else {
305 OMSG.rip_vers = RIPv1;
306 }
307
308 bzero(&myaddr, sizeof(myaddr));
309 myaddr.sin_family = AF_INET;
310 #ifdef _HAVE_SIN_LEN
311 myaddr.sin_len = sizeof(myaddr);
312 #endif
313 myaddr.sin_port = htons(IPPORT_RESERVED-1);
314 while (bind(s, (struct sockaddr *)&myaddr, sizeof(myaddr)) < 0) {
315 if (errno != EADDRINUSE
316 || myaddr.sin_port == 0) {
317 perror("bind");
318 exit(2);
319 }
320 myaddr.sin_port = htons(ntohs(myaddr.sin_port)-1);
321 }
322
323 res = 1;
324 while (*argv != 0) {
325 if (out(*argv++) <= 0)
326 res = 0;
327 }
328 exit(res);
329 }
330
331
332 /* query all of the listed hosts
333 */
334 static void
335 query_loop(char *argv[], int argc)
336 {
337 # define NA0 (OMSG.rip_auths[0])
338 # define NA2 (OMSG.rip_auths[2])
339 struct seen {
340 struct seen *next;
341 struct in_addr addr;
342 } *seen, *sp;
343 int answered = 0;
344 int cc;
345 fd_set bits;
346 struct timeval now, delay;
347 struct sockaddr_in from;
348 int fromlen;
349 MD5_CTX md5_ctx;
350
351
352 OMSG.rip_cmd = (pflag) ? RIPCMD_POLL : RIPCMD_REQUEST;
353 if (ripv2) {
354 OMSG.rip_vers = RIPv2;
355 if (auth_type == RIP_AUTH_PW) {
356 OMSG.rip_nets[1] = OMSG.rip_nets[0];
357 NA0.a_family = RIP_AF_AUTH;
358 NA0.a_type = RIP_AUTH_PW;
359 bcopy(passwd, NA0.au.au_pw,
360 RIP_AUTH_PW_LEN);
361 omsg_len += sizeof(OMSG.rip_nets[0]);
362
363 } else if (auth_type == RIP_AUTH_MD5) {
364 OMSG.rip_nets[1] = OMSG.rip_nets[0];
365 NA0.a_family = RIP_AF_AUTH;
366 NA0.a_type = RIP_AUTH_MD5;
367 NA0.au.a_md5.md5_keyid = (int8_t)keyid;
368 NA0.au.a_md5.md5_auth_len = RIP_AUTH_PW_LEN;
369 NA0.au.a_md5.md5_seqno = 0;
370 NA0.au.a_md5.md5_pkt_len = sizeof(OMSG.rip_nets[1]);
371 NA2.a_family = RIP_AF_AUTH;
372 NA2.a_type = 1;
373 bcopy(passwd, NA2.au.au_pw, sizeof(NA2.au.au_pw));
374 MD5Init(&md5_ctx);
375 MD5Update(&md5_ctx, (u_char *)&NA0,
376 (char *)(&NA2+1) - (char *)&NA0);
377 MD5Final(NA2.au.au_pw, &md5_ctx);
378 omsg_len += 2*sizeof(OMSG.rip_nets[0]);
379 }
380
381 } else {
382 OMSG.rip_vers = RIPv1;
383 OMSG.rip_nets[0].n_mask = 0;
384 }
385
386 /* ask the first (valid) host */
387 seen = 0;
388 while (0 > out(*argv++)) {
389 if (*argv == 0)
390 exit(-1);
391 answered++;
392 }
393
394 FD_ZERO(&bits);
395 for (;;) {
396 FD_SET(s, &bits);
397 delay.tv_sec = 0;
398 delay.tv_usec = STIME;
399 cc = select(s+1, &bits, 0,0, &delay);
400 if (cc > 0) {
401 fromlen = sizeof(from);
402 cc = recvfrom(s, imsg_buf.packet,
403 sizeof(imsg_buf.packet), 0,
404 (struct sockaddr *)&from, &fromlen);
405 if (cc < 0) {
406 perror("recvfrom");
407 exit(1);
408 }
409 /* count the distinct responding hosts.
410 * You cannot match responding hosts with
411 * addresses to which queries were transmitted,
412 * because a router might respond with a
413 * different source address.
414 */
415 for (sp = seen; sp != 0; sp = sp->next) {
416 if (sp->addr.s_addr == from.sin_addr.s_addr)
417 break;
418 }
419 if (sp == 0) {
420 sp = malloc(sizeof(*sp));
421 sp->addr = from.sin_addr;
422 sp->next = seen;
423 seen = sp;
424 answered++;
425 }
426
427 rip_input(&from, cc);
428 continue;
429 }
430
431 if (cc < 0) {
432 if ( errno == EINTR)
433 continue;
434 perror("select");
435 exit(1);
436 }
437
438 /* After a pause in responses, probe another host.
439 * This reduces the intermingling of answers.
440 */
441 while (*argv != 0 && 0 > out(*argv++))
442 answered++;
443
444 /* continue until no more packets arrive
445 * or we have heard from all hosts
446 */
447 if (answered >= argc)
448 break;
449
450 /* or until we have waited a long time
451 */
452 if (gettimeofday(&now, 0) < 0) {
453 perror("gettimeofday(now)");
454 exit(1);
455 }
456 if (sent.tv_sec + wtime <= now.tv_sec)
457 break;
458 }
459
460 /* fail if there was no answer */
461 exit (answered >= argc ? 0 : 1);
462 }
463
464
465 /* send to one host
466 */
467 static int
468 out(char *host)
469 {
470 struct sockaddr_in router;
471 struct hostent *hp;
472
473 if (gettimeofday(&sent, 0) < 0) {
474 perror("gettimeofday(sent)");
475 return -1;
476 }
477
478 bzero(&router, sizeof(router));
479 router.sin_family = AF_INET;
480 #ifdef _HAVE_SIN_LEN
481 router.sin_len = sizeof(router);
482 #endif
483 if (!inet_aton(host, &router.sin_addr)) {
484 hp = gethostbyname(host);
485 if (hp == 0) {
486 herror(host);
487 return -1;
488 }
489 bcopy(hp->h_addr, &router.sin_addr, sizeof(router.sin_addr));
490 }
491 router.sin_port = htons(RIP_PORT);
492
493 if (sendto(s, &omsg_buf, omsg_len, 0,
494 (struct sockaddr *)&router, sizeof(router)) < 0) {
495 perror(host);
496 return -1;
497 }
498
499 return 0;
500 }
501
502
503 /*
504 * Convert string to printable characters
505 */
506 static char *
507 qstring(u_char *s, int len)
508 {
509 static char buf[8*20+1];
510 char *p;
511 u_char *s2, c;
512
513
514 for (p = buf; len != 0 && p < &buf[sizeof(buf)-1]; len--) {
515 c = *s++;
516 if (c == '\0') {
517 for (s2 = s+1; s2 < &s[len]; s2++) {
518 if (*s2 != '\0')
519 break;
520 }
521 if (s2 >= &s[len])
522 goto exit;
523 }
524
525 if (c >= ' ' && c < 0x7f && c != '\\') {
526 *p++ = c;
527 continue;
528 }
529 *p++ = '\\';
530 switch (c) {
531 case '\\':
532 *p++ = '\\';
533 break;
534 case '\n':
535 *p++= 'n';
536 break;
537 case '\r':
538 *p++= 'r';
539 break;
540 case '\t':
541 *p++ = 't';
542 break;
543 case '\b':
544 *p++ = 'b';
545 break;
546 default:
547 p += sprintf(p,"%o",c);
548 break;
549 }
550 }
551 exit:
552 *p = '\0';
553 return buf;
554 }
555
556
557 /*
558 * Handle an incoming RIP packet.
559 */
560 static void
561 rip_input(struct sockaddr_in *from,
562 int size)
563 {
564 struct netinfo *n, *lim;
565 struct in_addr in;
566 char *name;
567 char net_buf[80];
568 u_int mask, dmask;
569 char *sp;
570 int i;
571 struct hostent *hp;
572 struct netent *np;
573 struct netauth *na;
574
575
576 if (nflag) {
577 printf("%s:", inet_ntoa(from->sin_addr));
578 } else {
579 hp = gethostbyaddr((char*)&from->sin_addr,
580 sizeof(struct in_addr), AF_INET);
581 if (hp == 0) {
582 printf("%s:",
583 inet_ntoa(from->sin_addr));
584 } else {
585 printf("%s (%s):", hp->h_name,
586 inet_ntoa(from->sin_addr));
587 }
588 }
589 if (IMSG.rip_cmd != RIPCMD_RESPONSE) {
590 printf("\n unexpected response type %d\n", IMSG.rip_cmd);
591 return;
592 }
593 printf(" RIPv%d%s %d bytes\n", IMSG.rip_vers,
594 (IMSG.rip_vers != RIPv1 && IMSG.rip_vers != RIPv2) ? " ?" : "",
595 size);
596 if (size > MAXPACKETSIZE) {
597 if (size > sizeof(imsg_buf) - sizeof(*n)) {
598 printf(" at least %d bytes too long\n",
599 size-MAXPACKETSIZE);
600 size = sizeof(imsg_buf) - sizeof(*n);
601 } else {
602 printf(" %d bytes too long\n",
603 size-MAXPACKETSIZE);
604 }
605 } else if (size%sizeof(*n) != sizeof(struct rip)%sizeof(*n)) {
606 printf(" response of bad length=%d\n", size);
607 }
608
609 n = IMSG.rip_nets;
610 lim = (struct netinfo *)((char*)n + size) - 1;
611 for (; n <= lim; n++) {
612 name = "";
613 if (n->n_family == RIP_AF_INET) {
614 in.s_addr = n->n_dst;
615 (void)strcpy(net_buf, inet_ntoa(in));
616
617 mask = ntohl(n->n_mask);
618 dmask = mask & -mask;
619 if (mask != 0) {
620 sp = &net_buf[strlen(net_buf)];
621 if (IMSG.rip_vers == RIPv1) {
622 (void)sprintf(sp," mask=%#x ? ",mask);
623 mask = 0;
624 } else if (mask + dmask == 0) {
625 for (i = 0;
626 (i != 32
627 && ((1<<i)&mask) == 0);
628 i++)
629 continue;
630 (void)sprintf(sp, "/%d",32-i);
631 } else {
632 (void)sprintf(sp," (mask %#x)", mask);
633 }
634 }
635
636 if (!nflag) {
637 if (mask == 0) {
638 mask = std_mask(in.s_addr);
639 if ((ntohl(in.s_addr) & ~mask) != 0)
640 mask = 0;
641 }
642 /* Without a netmask, do not worry about
643 * whether the destination is a host or a
644 * network. Try both and use the first name
645 * we get.
646 *
647 * If we have a netmask we can make a
648 * good guess.
649 */
650 if ((in.s_addr & ~mask) == 0) {
651 np = getnetbyaddr((long)in.s_addr,
652 AF_INET);
653 if (np != 0)
654 name = np->n_name;
655 else if (in.s_addr == 0)
656 name = "default";
657 }
658 if (name[0] == '\0'
659 && ((in.s_addr & ~mask) != 0
660 || mask == 0xffffffff)) {
661 hp = gethostbyaddr((char*)&in,
662 sizeof(in),
663 AF_INET);
664 if (hp != 0)
665 name = hp->h_name;
666 }
667 }
668
669 } else if (n->n_family == RIP_AF_AUTH) {
670 na = (struct netauth*)n;
671 if (na->a_type == RIP_AUTH_PW
672 && n == IMSG.rip_nets) {
673 (void)printf(" Password Authentication:"
674 " \"%s\"\n",
675 qstring(na->au.au_pw,
676 RIP_AUTH_PW_LEN));
677 continue;
678 }
679
680 if (na->a_type == RIP_AUTH_MD5
681 && n == IMSG.rip_nets) {
682 (void)printf(" MD5 Authentication"
683 " len=%d KeyID=%d"
684 " seqno=%d"
685 " rsvd=%#x,%#x\n",
686 na->au.a_md5.md5_pkt_len,
687 na->au.a_md5.md5_keyid,
688 na->au.a_md5.md5_seqno,
689 na->au.a_md5.rsvd[0],
690 na->au.a_md5.rsvd[1]);
691 continue;
692 }
693 (void)printf(" Authentication type %d: ",
694 ntohs(na->a_type));
695 for (i = 0; i < sizeof(na->au.au_pw); i++)
696 (void)printf("%02x ", na->au.au_pw[i]);
697 putc('\n', stdout);
698 continue;
699
700 } else {
701 (void)sprintf(net_buf, "(af %#x) %d.%d.%d.%d",
702 ntohs(n->n_family),
703 (char)(n->n_dst >> 24),
704 (char)(n->n_dst >> 16),
705 (char)(n->n_dst >> 8),
706 (char)n->n_dst);
707 }
708
709 (void)printf(" %-18s metric %2d %-10s",
710 net_buf, ntohl(n->n_metric), name);
711
712 if (n->n_nhop != 0) {
713 in.s_addr = n->n_nhop;
714 if (nflag)
715 hp = 0;
716 else
717 hp = gethostbyaddr((char*)&in, sizeof(in),
718 AF_INET);
719 (void)printf(" nhop=%-15s%s",
720 (hp != 0) ? hp->h_name : inet_ntoa(in),
721 (IMSG.rip_vers == RIPv1) ? " ?" : "");
722 }
723 if (n->n_tag != 0)
724 (void)printf(" tag=%#x%s", n->n_tag,
725 (IMSG.rip_vers == RIPv1) ? " ?" : "");
726 putc('\n', stdout);
727 }
728 }
729
730
731 /* Return the classical netmask for an IP address.
732 */
733 static u_int
734 std_mask(u_int addr) /* in network order */
735 {
736 NTOHL(addr); /* was a host, not a network */
737
738 if (addr == 0) /* default route has mask 0 */
739 return 0;
740 if (IN_CLASSA(addr))
741 return IN_CLASSA_NET;
742 if (IN_CLASSB(addr))
743 return IN_CLASSB_NET;
744 return IN_CLASSC_NET;
745 }
746
747
748 /* get a network number as a name or a number, with an optional "/xx"
749 * netmask.
750 */
751 static int /* 0=bad */
752 getnet(char *name,
753 struct netinfo *rt)
754 {
755 int i;
756 struct netent *nentp;
757 u_int mask;
758 struct in_addr in;
759 char hname[MAXHOSTNAMELEN+1];
760 char *mname, *p;
761
762
763 /* Detect and separate "1.2.3.4/24"
764 */
765 if (0 != (mname = rindex(name,'/'))) {
766 i = (int)(mname - name);
767 if (i > sizeof(hname)-1) /* name too long */
768 return 0;
769 bcopy(name, hname, i);
770 hname[i] = '\0';
771 mname++;
772 name = hname;
773 }
774
775 nentp = getnetbyname(name);
776 if (nentp != 0) {
777 in.s_addr = nentp->n_net;
778 } else if (inet_aton(name, &in) == 1) {
779 NTOHL(in.s_addr);
780 } else {
781 return 0;
782 }
783
784 if (mname == 0) {
785 mask = std_mask(in.s_addr);
786 if ((~mask & in.s_addr) != 0)
787 mask = 0xffffffff;
788 } else {
789 mask = (u_int)strtoul(mname, &p, 0);
790 if (*p != '\0' || mask > 32)
791 return 0;
792 mask = 0xffffffff << (32-mask);
793 }
794
795 rt->n_dst = htonl(in.s_addr);
796 rt->n_family = RIP_AF_INET;
797 rt->n_mask = htonl(mask);
798 return 1;
799 }
800
801
802 /* strtok(), but honoring backslash
803 */
804 static int /* -1=bad */
805 parse_quote(char **linep,
806 char *delims,
807 char *delimp,
808 char *buf,
809 int lim)
810 {
811 char c, *pc, *p;
812
813
814 pc = *linep;
815 if (*pc == '\0')
816 return -1;
817
818 for (;;) {
819 if (lim == 0)
820 return -1;
821 c = *pc++;
822 if (c == '\0')
823 break;
824
825 if (c == '\\' && pc != '\0') {
826 if ((c = *pc++) == 'n') {
827 c = '\n';
828 } else if (c == 'r') {
829 c = '\r';
830 } else if (c == 't') {
831 c = '\t';
832 } else if (c == 'b') {
833 c = '\b';
834 } else if (c >= '0' && c <= '7') {
835 c -= '0';
836 if (*pc >= '0' && *pc <= '7') {
837 c = (c<<3)+(*pc++ - '0');
838 if (*pc >= '0' && *pc <= '7')
839 c = (c<<3)+(*pc++ - '0');
840 }
841 }
842
843 } else {
844 for (p = delims; *p != '\0'; ++p) {
845 if (*p == c)
846 goto exit;
847 }
848 }
849
850 *buf++ = c;
851 --lim;
852 }
853 exit:
854 if (delimp != 0)
855 *delimp = c;
856 *linep = pc-1;
857 if (lim != 0)
858 *buf = '\0';
859 return 0;
860 }
861