rtquery.c revision 1.6 1 /* $NetBSD: rtquery.c,v 1.6 1998/03/30 02:15:16 mrg 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 acknowledgement:
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 char copyright[] =
37 "@(#) Copyright (c) 1982, 1986, 1993\n\
38 The Regents of the University of California. All rights reserved.\n";
39
40 #if !defined(lint) && !defined(sgi) && !defined(__NetBSD__)
41 static char sccsid[] = "@(#)query.c 8.1 (Berkeley) 6/5/93";
42 #elif defined(__NetBSD__)
43 #include <sys/cdefs.h>
44 __RCSID("$NetBSD: rtquery.c,v 1.6 1998/03/30 02:15:16 mrg Exp $");
45 #endif
46
47 #include <sys/param.h>
48 #include <sys/protosw.h>
49 #include <sys/socket.h>
50 #include <sys/time.h>
51 #include <netinet/in.h>
52 #define RIPVERSION RIPv2
53 #include <protocols/routed.h>
54 #include <arpa/inet.h>
55 #include <netdb.h>
56 #include <errno.h>
57 #include <unistd.h>
58 #include <stdio.h>
59 #include <stdlib.h>
60 #include <string.h>
61 #ifdef sgi
62 #include <strings.h>
63 #include <bstring.h>
64 #endif
65
66 #ifndef sgi
67 #define _HAVE_SIN_LEN
68 #endif
69
70 #define MD5_DIGEST_LEN 16
71 typedef struct {
72 u_int32_t state[4]; /* state (ABCD) */
73 u_int32_t count[2]; /* # of bits, modulo 2^64 (LSB 1st) */
74 unsigned char buffer[64]; /* input buffer */
75 } MD5_CTX;
76 extern void MD5Init(MD5_CTX*);
77 extern void MD5Update(MD5_CTX*, u_char*, u_int);
78 extern void MD5Final(u_char[MD5_DIGEST_LEN], MD5_CTX*);
79
80
81 #define WTIME 15 /* Time to wait for all responses */
82 #define STIME (250*1000) /* usec to wait for another response */
83
84 int s;
85
86 char *pgmname;
87
88 union {
89 struct rip rip;
90 char packet[MAXPACKETSIZE+MAXPATHLEN];
91 } omsg_buf;
92 #define OMSG omsg_buf.rip
93 int omsg_len = sizeof(struct rip);
94
95 union {
96 struct rip rip;
97 char packet[MAXPACKETSIZE+1024];
98 } imsg_buf;
99 #define IMSG imsg_buf.rip
100
101 int nflag; /* numbers, no names */
102 int pflag; /* play the `gated` game */
103 int ripv2 = 1; /* use RIP version 2 */
104 int wtime = WTIME;
105 int rflag; /* 1=ask about a particular route */
106 int trace, not_trace; /* send trace command or not */
107 int auth_type = RIP_AUTH_NONE;
108 char passwd[RIP_AUTH_PW_LEN];
109 u_long keyid;
110
111 struct timeval sent; /* when query sent */
112
113 static void rip_input(struct sockaddr_in*, int);
114 static int out(char *);
115 static void trace_loop(char *argv[]) __attribute((__noreturn__));
116 static void query_loop(char *argv[], int) __attribute((__noreturn__));
117 static int getnet(char *, struct netinfo *);
118 static u_int std_mask(u_int);
119 static int parse_quote(char **, char *, char *, char *, int);
120
121
122 int
123 main(int argc,
124 char *argv[])
125 {
126 int ch, bsize;
127 char *p, *options, *value, delim;
128
129 OMSG.rip_nets[0].n_dst = RIP_DEFAULT;
130 OMSG.rip_nets[0].n_family = RIP_AF_UNSPEC;
131 OMSG.rip_nets[0].n_metric = htonl(HOPCNT_INFINITY);
132
133 pgmname = argv[0];
134 while ((ch = getopt(argc, argv, "np1w:r:t:a:")) != -1)
135 switch (ch) {
136 case 'n':
137 not_trace = 1;
138 nflag = 1;
139 break;
140
141 case 'p':
142 not_trace = 1;
143 pflag = 1;
144 break;
145
146 case '1':
147 ripv2 = 0;
148 break;
149
150 case 'w':
151 not_trace = 1;
152 wtime = (int)strtoul(optarg, &p, 0);
153 if (*p != '\0'
154 || wtime <= 0)
155 goto usage;
156 break;
157
158 case 'r':
159 not_trace = 1;
160 if (rflag)
161 goto usage;
162 rflag = getnet(optarg, &OMSG.rip_nets[0]);
163 if (!rflag) {
164 struct hostent *hp = gethostbyname(optarg);
165 if (hp == 0) {
166 fprintf(stderr, "%s: %s:",
167 pgmname, optarg);
168 herror(0);
169 exit(1);
170 }
171 memmove(&OMSG.rip_nets[0].n_dst, hp->h_addr,
172 sizeof(OMSG.rip_nets[0].n_dst));
173 OMSG.rip_nets[0].n_family = RIP_AF_INET;
174 OMSG.rip_nets[0].n_mask = -1;
175 rflag = 1;
176 }
177 break;
178
179 case 't':
180 trace = 1;
181 options = optarg;
182 while (*options != '\0') {
183 char *traceopts[] = {
184 # define TRACE_ON 0
185 "on",
186 # define TRACE_MORE 1
187 "more",
188 # define TRACE_OFF 2
189 "off",
190 # define TRACE_DUMP 3
191 "dump",
192 0
193 };
194 switch (getsubopt(&options,traceopts,&value)) {
195 case TRACE_ON:
196 OMSG.rip_cmd = RIPCMD_TRACEON;
197 if (!value
198 || strlen(value) > MAXPATHLEN)
199 goto usage;
200 break;
201 case TRACE_MORE:
202 if (value)
203 goto usage;
204 OMSG.rip_cmd = RIPCMD_TRACEON;
205 value = "";
206 break;
207 case TRACE_OFF:
208 if (value)
209 goto usage;
210 OMSG.rip_cmd = RIPCMD_TRACEOFF;
211 value = "";
212 break;
213 case TRACE_DUMP:
214 if (value)
215 goto usage;
216 OMSG.rip_cmd = RIPCMD_TRACEON;
217 value = "dump/../table";
218 break;
219 default:
220 goto usage;
221 }
222 strcpy((char*)OMSG.rip_tracefile, value);
223 omsg_len += strlen(value) - sizeof(OMSG.ripun);
224 }
225 break;
226
227 case 'a':
228 not_trace = 1;
229 p = strchr(optarg,'=');
230 if (!p)
231 goto usage;
232 *p++ = '\0';
233 if (!strcasecmp("passwd",optarg))
234 auth_type = RIP_AUTH_PW;
235 else if (!strcasecmp("md5_passwd",optarg))
236 auth_type = RIP_AUTH_MD5;
237 else
238 goto usage;
239 if (0 > parse_quote(&p,"|",&delim,
240 passwd,sizeof(passwd)))
241 goto usage;
242 if (auth_type == RIP_AUTH_MD5
243 && delim == '|') {
244 keyid = strtoul(p+1,&p,0);
245 if (keyid > 255 || *p != '\0')
246 goto usage;
247 } else if (delim != '\0') {
248 goto usage;
249 }
250 break;
251
252 default:
253 goto usage;
254 }
255 argv += optind;
256 argc -= optind;
257 if ((not_trace && trace) || argc == 0) {
258 usage: fprintf(stderr, "%s: [-np1v] [-r tgt_rt] [-w wtime]"
259 " [-a type=passwd] host1 [host2 ...]\n"
260 "or\t-t {on=filename|more|off|dump}"
261 " host1 [host2 ...]\n",
262 pgmname);
263 exit(1);
264 }
265
266 s = socket(AF_INET, SOCK_DGRAM, 0);
267 if (s < 0) {
268 perror("socket");
269 exit(2);
270 }
271
272 /* be prepared to receive a lot of routes */
273 for (bsize = 127*1024; ; bsize -= 1024) {
274 if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
275 &bsize, sizeof(bsize)) == 0)
276 break;
277 if (bsize <= 4*1024) {
278 perror("setsockopt SO_RCVBUF");
279 break;
280 }
281 }
282
283 if (trace)
284 trace_loop(argv);
285 else
286 query_loop(argv, argc);
287 /* NOTREACHED */
288 }
289
290
291 /* tell the target hosts about tracing
292 */
293 static void
294 trace_loop(char *argv[])
295 {
296 struct sockaddr_in myaddr;
297 int res;
298
299 if (geteuid() != 0) {
300 (void)fprintf(stderr, "-t requires UID 0\n");
301 exit(1);
302 }
303
304 if (ripv2) {
305 OMSG.rip_vers = RIPv2;
306 } else {
307 OMSG.rip_vers = RIPv1;
308 }
309
310 memset(&myaddr, 0, sizeof(myaddr));
311 myaddr.sin_family = AF_INET;
312 #ifdef _HAVE_SIN_LEN
313 myaddr.sin_len = sizeof(myaddr);
314 #endif
315 myaddr.sin_port = htons(IPPORT_RESERVED-1);
316 while (bind(s, (struct sockaddr *)&myaddr, sizeof(myaddr)) < 0) {
317 if (errno != EADDRINUSE
318 || myaddr.sin_port == 0) {
319 perror("bind");
320 exit(2);
321 }
322 myaddr.sin_port = htons(ntohs(myaddr.sin_port)-1);
323 }
324
325 res = 1;
326 while (*argv != 0) {
327 if (out(*argv++) <= 0)
328 res = 0;
329 }
330 exit(res);
331 }
332
333
334 /* query all of the listed hosts
335 */
336 static void
337 query_loop(char *argv[], int argc)
338 {
339 # define NA0 (OMSG.rip_auths[0])
340 # define NA2 (OMSG.rip_auths[2])
341 struct seen {
342 struct seen *next;
343 struct in_addr addr;
344 } *seen, *sp;
345 int answered = 0;
346 int cc;
347 fd_set bits;
348 struct timeval now, delay;
349 struct sockaddr_in from;
350 int fromlen;
351 MD5_CTX md5_ctx;
352
353
354 OMSG.rip_cmd = (pflag) ? RIPCMD_POLL : RIPCMD_REQUEST;
355 if (ripv2) {
356 OMSG.rip_vers = RIPv2;
357 if (auth_type == RIP_AUTH_PW) {
358 OMSG.rip_nets[1] = OMSG.rip_nets[0];
359 NA0.a_family = RIP_AF_AUTH;
360 NA0.a_type = RIP_AUTH_PW;
361 memmove(NA0.au.au_pw, passwd, RIP_AUTH_PW_LEN);
362 omsg_len += sizeof(OMSG.rip_nets[0]);
363
364 } else if (auth_type == RIP_AUTH_MD5) {
365 OMSG.rip_nets[1] = OMSG.rip_nets[0];
366 NA0.a_family = RIP_AF_AUTH;
367 NA0.a_type = RIP_AUTH_MD5;
368 NA0.au.a_md5.md5_keyid = (int8_t)keyid;
369 NA0.au.a_md5.md5_auth_len = RIP_AUTH_PW_LEN;
370 NA0.au.a_md5.md5_seqno = 0;
371 NA0.au.a_md5.md5_pkt_len = sizeof(OMSG.rip_nets[1]);
372 NA2.a_family = RIP_AF_AUTH;
373 NA2.a_type = 1;
374 memmove(NA2.au.au_pw, passwd, sizeof(NA2.au.au_pw));
375 MD5Init(&md5_ctx);
376 MD5Update(&md5_ctx, (u_char *)&NA0,
377 (char *)(&NA2+1) - (char *)&NA0);
378 MD5Final(NA2.au.au_pw, &md5_ctx);
379 omsg_len += 2*sizeof(OMSG.rip_nets[0]);
380 }
381
382 } else {
383 OMSG.rip_vers = RIPv1;
384 OMSG.rip_nets[0].n_mask = 0;
385 }
386
387 /* ask the first (valid) host */
388 seen = 0;
389 while (0 > out(*argv++)) {
390 if (*argv == 0)
391 exit(-1);
392 answered++;
393 }
394
395 FD_ZERO(&bits);
396 for (;;) {
397 FD_SET(s, &bits);
398 delay.tv_sec = 0;
399 delay.tv_usec = STIME;
400 cc = select(s+1, &bits, 0,0, &delay);
401 if (cc > 0) {
402 fromlen = sizeof(from);
403 cc = recvfrom(s, imsg_buf.packet,
404 sizeof(imsg_buf.packet), 0,
405 (struct sockaddr *)&from, &fromlen);
406 if (cc < 0) {
407 perror("recvfrom");
408 exit(1);
409 }
410 /* count the distinct responding hosts.
411 * You cannot match responding hosts with
412 * addresses to which queries were transmitted,
413 * because a router might respond with a
414 * different source address.
415 */
416 for (sp = seen; sp != 0; sp = sp->next) {
417 if (sp->addr.s_addr == from.sin_addr.s_addr)
418 break;
419 }
420 if (sp == 0) {
421 sp = malloc(sizeof(*sp));
422 sp->addr = from.sin_addr;
423 sp->next = seen;
424 seen = sp;
425 answered++;
426 }
427
428 rip_input(&from, cc);
429 continue;
430 }
431
432 if (cc < 0) {
433 if ( errno == EINTR)
434 continue;
435 perror("select");
436 exit(1);
437 }
438
439 /* After a pause in responses, probe another host.
440 * This reduces the intermingling of answers.
441 */
442 while (*argv != 0 && 0 > out(*argv++))
443 answered++;
444
445 /* continue until no more packets arrive
446 * or we have heard from all hosts
447 */
448 if (answered >= argc)
449 break;
450
451 /* or until we have waited a long time
452 */
453 if (gettimeofday(&now, 0) < 0) {
454 perror("gettimeofday(now)");
455 exit(1);
456 }
457 if (sent.tv_sec + wtime <= now.tv_sec)
458 break;
459 }
460
461 /* fail if there was no answer */
462 exit (answered >= argc ? 0 : 1);
463 }
464
465
466 /* send to one host
467 */
468 static int
469 out(char *host)
470 {
471 struct sockaddr_in router;
472 struct hostent *hp;
473
474 if (gettimeofday(&sent, 0) < 0) {
475 perror("gettimeofday(sent)");
476 return -1;
477 }
478
479 memset(&router, 0, sizeof(router));
480 router.sin_family = AF_INET;
481 #ifdef _HAVE_SIN_LEN
482 router.sin_len = sizeof(router);
483 #endif
484 if (!inet_aton(host, &router.sin_addr)) {
485 hp = gethostbyname(host);
486 if (hp == 0) {
487 herror(host);
488 return -1;
489 }
490 memmove(&router.sin_addr, hp->h_addr, sizeof(router.sin_addr));
491 }
492 router.sin_port = htons(RIP_PORT);
493
494 if (sendto(s, &omsg_buf, omsg_len, 0,
495 (struct sockaddr *)&router, sizeof(router)) < 0) {
496 perror(host);
497 return -1;
498 }
499
500 return 0;
501 }
502
503
504 /*
505 * Convert string to printable characters
506 */
507 static char *
508 qstring(u_char *s, int len)
509 {
510 static char buf[8*20+1];
511 char *p;
512 u_char *s2, c;
513
514
515 for (p = buf; len != 0 && p < &buf[sizeof(buf)-1]; len--) {
516 c = *s++;
517 if (c == '\0') {
518 for (s2 = s+1; s2 < &s[len]; s2++) {
519 if (*s2 != '\0')
520 break;
521 }
522 if (s2 >= &s[len])
523 goto exit;
524 }
525
526 if (c >= ' ' && c < 0x7f && c != '\\') {
527 *p++ = c;
528 continue;
529 }
530 *p++ = '\\';
531 switch (c) {
532 case '\\':
533 *p++ = '\\';
534 break;
535 case '\n':
536 *p++= 'n';
537 break;
538 case '\r':
539 *p++= 'r';
540 break;
541 case '\t':
542 *p++ = 't';
543 break;
544 case '\b':
545 *p++ = 'b';
546 break;
547 default:
548 p += sprintf(p,"%o",c);
549 break;
550 }
551 }
552 exit:
553 *p = '\0';
554 return buf;
555 }
556
557
558 /*
559 * Handle an incoming RIP packet.
560 */
561 static void
562 rip_input(struct sockaddr_in *from,
563 int size)
564 {
565 struct netinfo *n, *lim;
566 struct in_addr in;
567 char *name;
568 char net_buf[80];
569 u_int mask, dmask;
570 char *sp;
571 int i;
572 struct hostent *hp;
573 struct netent *np;
574 struct netauth *na;
575
576
577 if (nflag) {
578 printf("%s:", inet_ntoa(from->sin_addr));
579 } else {
580 hp = gethostbyaddr((char*)&from->sin_addr,
581 sizeof(struct in_addr), AF_INET);
582 if (hp == 0) {
583 printf("%s:",
584 inet_ntoa(from->sin_addr));
585 } else {
586 printf("%s (%s):", hp->h_name,
587 inet_ntoa(from->sin_addr));
588 }
589 }
590 if (IMSG.rip_cmd != RIPCMD_RESPONSE) {
591 printf("\n unexpected response type %d\n", IMSG.rip_cmd);
592 return;
593 }
594 printf(" RIPv%d%s %d bytes\n", IMSG.rip_vers,
595 (IMSG.rip_vers != RIPv1 && IMSG.rip_vers != RIPv2) ? " ?" : "",
596 size);
597 if (size > MAXPACKETSIZE) {
598 if (size > sizeof(imsg_buf) - sizeof(*n)) {
599 printf(" at least %d bytes too long\n",
600 size-MAXPACKETSIZE);
601 size = sizeof(imsg_buf) - sizeof(*n);
602 } else {
603 printf(" %d bytes too long\n",
604 size-MAXPACKETSIZE);
605 }
606 } else if (size%sizeof(*n) != sizeof(struct rip)%sizeof(*n)) {
607 printf(" response of bad length=%d\n", size);
608 }
609
610 n = IMSG.rip_nets;
611 lim = (struct netinfo *)((char*)n + size) - 1;
612 for (; n <= lim; n++) {
613 name = "";
614 if (n->n_family == RIP_AF_INET) {
615 in.s_addr = n->n_dst;
616 (void)strcpy(net_buf, inet_ntoa(in));
617
618 mask = ntohl(n->n_mask);
619 dmask = mask & -mask;
620 if (mask != 0) {
621 sp = &net_buf[strlen(net_buf)];
622 if (IMSG.rip_vers == RIPv1) {
623 (void)sprintf(sp," mask=%#x ? ",mask);
624 mask = 0;
625 } else if (mask + dmask == 0) {
626 for (i = 0;
627 (i != 32
628 && ((1<<i)&mask) == 0);
629 i++)
630 continue;
631 (void)sprintf(sp, "/%d",32-i);
632 } else {
633 (void)sprintf(sp," (mask %#x)", mask);
634 }
635 }
636
637 if (!nflag) {
638 if (mask == 0) {
639 mask = std_mask(in.s_addr);
640 if ((ntohl(in.s_addr) & ~mask) != 0)
641 mask = 0;
642 }
643 /* Without a netmask, do not worry about
644 * whether the destination is a host or a
645 * network. Try both and use the first name
646 * we get.
647 *
648 * If we have a netmask we can make a
649 * good guess.
650 */
651 if ((in.s_addr & ~mask) == 0) {
652 np = getnetbyaddr((long)in.s_addr,
653 AF_INET);
654 if (np != 0)
655 name = np->n_name;
656 else if (in.s_addr == 0)
657 name = "default";
658 }
659 if (name[0] == '\0'
660 && ((in.s_addr & ~mask) != 0
661 || mask == 0xffffffff)) {
662 hp = gethostbyaddr((char*)&in,
663 sizeof(in),
664 AF_INET);
665 if (hp != 0)
666 name = hp->h_name;
667 }
668 }
669
670 } else if (n->n_family == RIP_AF_AUTH) {
671 na = (struct netauth*)n;
672 if (na->a_type == RIP_AUTH_PW
673 && n == IMSG.rip_nets) {
674 (void)printf(" Password Authentication:"
675 " \"%s\"\n",
676 qstring(na->au.au_pw,
677 RIP_AUTH_PW_LEN));
678 continue;
679 }
680
681 if (na->a_type == RIP_AUTH_MD5
682 && n == IMSG.rip_nets) {
683 (void)printf(" MD5 Authentication"
684 " len=%d KeyID=%d"
685 " seqno=%d"
686 " rsvd=%#x,%#x\n",
687 na->au.a_md5.md5_pkt_len,
688 na->au.a_md5.md5_keyid,
689 na->au.a_md5.md5_seqno,
690 na->au.a_md5.rsvd[0],
691 na->au.a_md5.rsvd[1]);
692 continue;
693 }
694 (void)printf(" Authentication type %d: ",
695 ntohs(na->a_type));
696 for (i = 0; i < sizeof(na->au.au_pw); i++)
697 (void)printf("%02x ", na->au.au_pw[i]);
698 putc('\n', stdout);
699 continue;
700
701 } else {
702 (void)sprintf(net_buf, "(af %#x) %d.%d.%d.%d",
703 ntohs(n->n_family),
704 (char)(n->n_dst >> 24),
705 (char)(n->n_dst >> 16),
706 (char)(n->n_dst >> 8),
707 (char)n->n_dst);
708 }
709
710 (void)printf(" %-18s metric %2d %-10s",
711 net_buf, ntohl(n->n_metric), name);
712
713 if (n->n_nhop != 0) {
714 in.s_addr = n->n_nhop;
715 if (nflag)
716 hp = 0;
717 else
718 hp = gethostbyaddr((char*)&in, sizeof(in),
719 AF_INET);
720 (void)printf(" nhop=%-15s%s",
721 (hp != 0) ? hp->h_name : inet_ntoa(in),
722 (IMSG.rip_vers == RIPv1) ? " ?" : "");
723 }
724 if (n->n_tag != 0)
725 (void)printf(" tag=%#x%s", n->n_tag,
726 (IMSG.rip_vers == RIPv1) ? " ?" : "");
727 putc('\n', stdout);
728 }
729 }
730
731
732 /* Return the classical netmask for an IP address.
733 */
734 static u_int
735 std_mask(u_int addr) /* in network order */
736 {
737 NTOHL(addr); /* was a host, not a network */
738
739 if (addr == 0) /* default route has mask 0 */
740 return 0;
741 if (IN_CLASSA(addr))
742 return IN_CLASSA_NET;
743 if (IN_CLASSB(addr))
744 return IN_CLASSB_NET;
745 return IN_CLASSC_NET;
746 }
747
748
749 /* get a network number as a name or a number, with an optional "/xx"
750 * netmask.
751 */
752 static int /* 0=bad */
753 getnet(char *name,
754 struct netinfo *rt)
755 {
756 int i;
757 struct netent *nentp;
758 u_int mask;
759 struct in_addr in;
760 char hname[MAXHOSTNAMELEN+1];
761 char *mname, *p;
762
763
764 /* Detect and separate "1.2.3.4/24"
765 */
766 if (0 != (mname = strrchr(name,'/'))) {
767 i = (int)(mname - name);
768 if (i > sizeof(hname)-1) /* name too long */
769 return 0;
770 memmove(hname, name, i);
771 hname[i] = '\0';
772 mname++;
773 name = hname;
774 }
775
776 nentp = getnetbyname(name);
777 if (nentp != 0) {
778 in.s_addr = nentp->n_net;
779 } else if (inet_aton(name, &in) == 1) {
780 NTOHL(in.s_addr);
781 } else {
782 return 0;
783 }
784
785 if (mname == 0) {
786 mask = std_mask(in.s_addr);
787 if ((~mask & in.s_addr) != 0)
788 mask = 0xffffffff;
789 } else {
790 mask = (u_int)strtoul(mname, &p, 0);
791 if (*p != '\0' || mask > 32)
792 return 0;
793 mask = 0xffffffff << (32-mask);
794 }
795
796 rt->n_dst = htonl(in.s_addr);
797 rt->n_family = RIP_AF_INET;
798 rt->n_mask = htonl(mask);
799 return 1;
800 }
801
802
803 /* strtok(), but honoring backslash
804 */
805 static int /* -1=bad */
806 parse_quote(char **linep,
807 char *delims,
808 char *delimp,
809 char *buf,
810 int lim)
811 {
812 char c, *pc, *p;
813
814
815 pc = *linep;
816 if (*pc == '\0')
817 return -1;
818
819 for (;;) {
820 if (lim == 0)
821 return -1;
822 c = *pc++;
823 if (c == '\0')
824 break;
825
826 if (c == '\\' && pc != '\0') {
827 if ((c = *pc++) == 'n') {
828 c = '\n';
829 } else if (c == 'r') {
830 c = '\r';
831 } else if (c == 't') {
832 c = '\t';
833 } else if (c == 'b') {
834 c = '\b';
835 } else if (c >= '0' && c <= '7') {
836 c -= '0';
837 if (*pc >= '0' && *pc <= '7') {
838 c = (c<<3)+(*pc++ - '0');
839 if (*pc >= '0' && *pc <= '7')
840 c = (c<<3)+(*pc++ - '0');
841 }
842 }
843
844 } else {
845 for (p = delims; *p != '\0'; ++p) {
846 if (*p == c)
847 goto exit;
848 }
849 }
850
851 *buf++ = c;
852 --lim;
853 }
854 exit:
855 if (delimp != 0)
856 *delimp = c;
857 *linep = pc-1;
858 if (lim != 0)
859 *buf = '\0';
860 return 0;
861 }
862