Merge branch 'vendor/ELFTOOLCHAIN'
[dragonfly.git] / usr.sbin / rrenumd / rrenumd.c
1 /*      $KAME: rrenumd.c,v 1.20 2000/11/08 02:40:53 itojun Exp $        */
2
3 /*
4  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5  * 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. Neither the name of the project nor the names of its contributors
16  *    may be used to endorse or promote products derived from this software
17  *    without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  *
31  * $FreeBSD: src/usr.sbin/rrenumd/rrenumd.c,v 1.1.2.4 2001/07/09 09:49:49 ume Exp $
32  */
33
34 #include <sys/param.h>
35 #include <sys/socket.h>
36 #include <sys/uio.h>
37 #include <sys/time.h>
38
39 #include <string.h>
40
41 #include <net/route.h>
42
43 #include <netinet/in_systm.h>
44 #include <netinet/in.h>
45 #include <netinet/ip.h>
46 #include <netinet/ip6.h>
47 #include <netinet/icmp6.h>
48
49 #include <arpa/inet.h>
50
51 #ifdef IPSEC
52 #include <netinet6/ipsec.h>
53 #endif
54
55 #include <stdio.h>
56 #include <err.h>
57 #include <errno.h>
58 #include <stdlib.h>
59 #include <unistd.h>
60 #include <syslog.h>
61
62 #include "rrenumd.h"
63
64 #define LL_ALLROUTERS "ff02::2"
65 #define SL_ALLROUTERS "ff05::2"
66
67 #define RR_MCHLIM_DEFAULT 64
68
69 #ifndef IN6_IS_SCOPE_LINKLOCAL
70 #define IN6_IS_SCOPE_LINKLOCAL(a)       \
71         ((IN6_IS_ADDR_LINKLOCAL(a)) ||  \
72          (IN6_IS_ADDR_MC_LINKLOCAL(a)))
73 #endif /* IN6_IS_SCOPE_LINKLOCAL */
74
75 struct flags {
76         u_long debug : 1;
77         u_long fg : 1;
78 #ifdef IPSEC
79 #ifdef IPSEC_POLICY_IPSEC
80         u_long policy : 1;
81 #else /* IPSEC_POLICY_IPSEC */
82         u_long auth : 1;
83         u_long encrypt : 1;
84 #endif /* IPSEC_POLICY_IPSEC */
85 #endif /*IPSEC*/
86 };
87
88 struct msghdr sndmhdr;
89 struct msghdr rcvmhdr;
90 struct sockaddr_in6 from;
91 struct sockaddr_in6 sin6_ll_allrouters;
92
93 int s4, s6;
94 int with_v4dest, with_v6dest;
95 struct in6_addr prefix; /* ADHOC */
96 int prefixlen = 64; /* ADHOC */
97
98 extern int parse(FILE **);
99
100 static void show_usage(void);
101 static void init_sin6(struct sockaddr_in6 *, const char *);
102 #if 0
103 static void join_multi(const char *);
104 #endif
105 static void init_globals(void);
106 static void config(FILE **);
107 #ifdef IPSEC_POLICY_IPSEC
108 static void sock6_open(struct flags *, char *);
109 static void sock4_open(struct flags *, char *);
110 #else
111 static void sock6_open(struct flags *);
112 static void sock4_open(struct flags *);
113 #endif
114 static void rrenum_output(struct payload_list *, struct dst_list *);
115 static void rrenum_snd_eachdst(struct payload_list *);
116 #if 0
117 static void rrenum_snd_fullsequence(void);
118 #endif
119 static void rrenum_input(int);
120
121
122 /* Print usage. Don't call this after daemonized. */
123 static void
124 show_usage(void)
125 {
126         fprintf(stderr, "usage: rrenumd [-c conf_file|-s] [-df"
127 #ifdef IPSEC
128 #ifdef IPSEC_POLICY_IPSEC
129                 "] [-P policy"
130 #else /* IPSEC_POLICY_IPSEC */
131                 "AE"
132 #endif /* IPSEC_POLICY_IPSEC */
133 #endif /* IPSEC */
134                 "]\n");
135         exit(1);
136 }
137
138 static void
139 init_sin6(struct sockaddr_in6 *sin6, const char *addr_ascii)
140 {
141         memset(sin6, 0, sizeof(*sin6));
142         sin6->sin6_len = sizeof(*sin6);
143         sin6->sin6_family = AF_INET6;
144         if (inet_pton(AF_INET6, addr_ascii, &sin6->sin6_addr) != 1)
145                 ; /* XXX do something */
146 }
147
148 #if 0  /* XXX: not necessary ?? */
149 static void
150 join_multi(const char *addrname)
151 {
152         struct ipv6_mreq mreq;
153
154         if (inet_pton(AF_INET6, addrname, &mreq.ipv6mr_multiaddr.s6_addr)
155             != 1) {
156                 syslog(LOG_ERR, "<%s> inet_pton failed(library bug?)",
157                        __func__);
158                 exit(1);
159         }
160         /* ADHOC: currently join only one */
161         {
162                 if ((mreq.ipv6mr_interface = if_nametoindex(ifname)) == 0) {
163                         syslog(LOG_ERR, "<%s> ifname %s should be invalid: %s",
164                                __func__, ifname, strerror(errno));
165                         exit(1);
166                 }
167                 if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP,
168                                &mreq,
169                                sizeof(mreq)) < 0) {
170                         syslog(LOG_ERR, "<%s> IPV6_JOIN_GROUP on %s: %s",
171                                __func__, ifname, strerror(errno));
172                         exit(1);
173                 }
174         }
175 }
176 #endif
177
178 static void
179 init_globals(void)
180 {
181         static struct iovec rcviov;
182         static u_char rprdata[4500]; /* maximal MTU of connected links */
183         static u_char *rcvcmsgbuf = NULL;
184         static u_char *sndcmsgbuf = NULL;
185         int sndcmsglen, rcvcmsglen;
186
187         /* init ll_allrouters */
188         init_sin6(&sin6_ll_allrouters, LL_ALLROUTERS);
189
190         /* initialize msghdr for receiving packets */
191         rcviov.iov_base = (caddr_t)rprdata;
192         rcviov.iov_len = sizeof(rprdata);
193         rcvmhdr.msg_namelen = sizeof(struct sockaddr_in6);
194         rcvmhdr.msg_iov = &rcviov;
195         rcvmhdr.msg_iovlen = 1;
196         rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
197                 CMSG_SPACE(sizeof(int));
198         if (rcvcmsgbuf == NULL &&
199             (rcvcmsgbuf = (u_char *)malloc(rcvcmsglen)) == NULL) {
200                 syslog(LOG_ERR, "<%s>: malloc failed", __func__);
201                 exit(1);
202         }
203         rcvmhdr.msg_control = (caddr_t)rcvcmsgbuf;
204         rcvmhdr.msg_controllen = rcvcmsglen;
205
206         /* initialize msghdr for sending packets */
207         sndmhdr.msg_namelen = sizeof(struct sockaddr_in6);
208         sndmhdr.msg_iovlen = 1;
209         sndcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
210                 CMSG_SPACE(sizeof(int));
211         if (sndcmsgbuf == NULL &&
212             (sndcmsgbuf = (u_char *)malloc(sndcmsglen)) == NULL) {
213                 syslog(LOG_ERR, "<%s>: malloc failed", __func__);
214                 exit(1);
215         }
216         sndmhdr.msg_control = (caddr_t)sndcmsgbuf;
217         sndmhdr.msg_controllen = sndcmsglen;
218 }
219
220 static void
221 config(FILE **fpp)
222 {
223         struct payload_list *pl;
224         struct iovec *iov;
225         struct icmp6_router_renum *irr;
226         struct rr_pco_match *rpm;
227
228         if (parse(fpp) < 0) {
229                 syslog(LOG_ERR, "<%s> parse failed", __func__);
230                 exit(1);
231         }
232
233         /* initialize fields not configured by parser */
234         for (pl = pl_head; pl; pl = pl->pl_next) {
235                 iov = (struct iovec *)&pl->pl_sndiov;
236                 irr = (struct icmp6_router_renum *)&pl->pl_irr;
237                 rpm = (struct rr_pco_match *)&pl->pl_rpm;
238
239                 irr->rr_type = ICMP6_ROUTER_RENUMBERING;
240                 irr->rr_code = 0;
241                 /*
242                  * now we don't support multiple PCOs in a rr message.
243                  * so segment number is not supported.
244                  */
245                 /* TODO: rr flags config in parser */
246                 irr->rr_flags |= ICMP6_RR_FLAGS_SPECSITE;
247                 /* TODO: max delay config in parser */
248
249                 /*
250                  * means only 1 use_prefix is contained as router-renum-05.txt.
251                  * now we don't support multiple PCOs in a rr message,
252                  * nor multiple use_prefix in one PCO.
253                  */
254                 rpm->rpm_len = 4*1 +3;
255                 rpm->rpm_ordinal = 0;
256                 iov->iov_base = (caddr_t)irr;
257                 iov->iov_len =  sizeof(struct icmp6_router_renum)
258                         + sizeof(struct rr_pco_match)
259                         + sizeof(struct rr_pco_use);
260         }
261 }
262
263 static void
264 sock6_open(struct flags *flags
265 #ifdef IPSEC_POLICY_IPSEC
266            , char *policy
267 #endif /* IPSEC_POLICY_IPSEC */
268            )
269 {
270         struct icmp6_filter filt;
271         int on;
272 #ifdef IPSEC
273 #ifndef IPSEC_POLICY_IPSEC
274         int optval;
275 #endif
276 #endif
277
278         if (with_v6dest == 0)
279                 return;
280         if (with_v6dest &&
281             (s6 = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
282                 syslog(LOG_ERR, "<%s> socket(v6): %s", __func__,
283                        strerror(errno));
284                 exit(1);
285         }
286
287         /*
288          * join all routers multicast addresses.
289          */
290 #if 0 /* XXX: not necessary ?? */
291         join_multi(LL_ALLROUTERS);
292         join_multi(SL_ALLROUTERS);
293 #endif
294
295         /* set icmpv6 filter */
296         ICMP6_FILTER_SETBLOCKALL(&filt);
297         ICMP6_FILTER_SETPASS(ICMP6_ROUTER_RENUMBERING, &filt);
298         if (setsockopt(s6, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
299                        sizeof(filt)) < 0) {
300                 syslog(LOG_ERR, "<%s> IICMP6_FILTER: %s",
301                        __func__, strerror(errno));
302                 exit(1);
303         }
304
305         /* specify to tell receiving interface */
306         on = 1;
307         if (setsockopt(s6, IPPROTO_IPV6, IPV6_PKTINFO, &on,
308                        sizeof(on)) < 0) {
309                 syslog(LOG_ERR, "<%s> IPV6_PKTINFO: %s",
310                        __func__, strerror(errno));
311                 exit(1);
312         }
313
314 #ifdef IPSEC
315 #ifdef IPSEC_POLICY_IPSEC
316         if (flags->policy) {
317                 char *buf;
318                 buf = ipsec_set_policy(policy, strlen(policy));
319                 if (buf == NULL)
320                         errx(1, "%s", ipsec_strerror());
321                 /* XXX should handle in/out bound policy. */
322                 if (setsockopt(s6, IPPROTO_IPV6, IPV6_IPSEC_POLICY,
323                                 buf, ipsec_get_policylen(buf)) < 0)
324                         err(1, "setsockopt(IPV6_IPSEC_POLICY)");
325                 free(buf);
326         }
327 #else /* IPSEC_POLICY_IPSEC */
328         if (flags->auth) {
329                 optval = IPSEC_LEVEL_REQUIRE;
330                 if (setsockopt(s6, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL,
331                                &optval, sizeof(optval)) == -1) {
332                         syslog(LOG_ERR, "<%s> IPV6_AUTH_TRANS_LEVEL: %s",
333                                __func__, strerror(errno));
334                         exit(1);
335                 }
336         }
337         if (flags->encrypt) {
338                 optval = IPSEC_LEVEL_REQUIRE;
339                 if (setsockopt(s6, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL,
340                                 &optval, sizeof(optval)) == -1) {
341                         syslog(LOG_ERR, "<%s> IPV6_ESP_TRANS_LEVEL: %s",
342                                __func__, strerror(errno));
343                         exit(1);
344                 }
345         }
346 #endif /* IPSEC_POLICY_IPSEC */
347 #endif /* IPSEC */
348
349         return;
350 }
351
352 static void
353 sock4_open(struct flags *flags
354 #ifdef IPSEC_POLICY_IPSEC
355            , char *policy
356 #endif /* IPSEC_POLICY_IPSEC */
357            )
358 {
359 #ifdef IPSEC
360 #ifndef IPSEC_POLICY_IPSEC
361         int optval;
362 #endif
363 #endif
364
365         if (with_v4dest == 0)
366                 return;
367         if ((s4 = socket(AF_INET, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
368                 syslog(LOG_ERR, "<%s> socket(v4): %s", __func__,
369                        strerror(errno));
370                 exit(1);
371         }
372
373 #if 0 /* XXX: not necessary ?? */
374         /*
375          * join all routers multicast addresses.
376          */
377         some_join_function();
378 #endif
379
380 #ifdef IPSEC
381 #ifdef IPSEC_POLICY_IPSEC
382         if (flags->policy) {
383                 char *buf;
384                 buf = ipsec_set_policy(policy, strlen(policy));
385                 if (buf == NULL)
386                         errx(1, "%s", ipsec_strerror());
387                 /* XXX should handle in/out bound policy. */
388                 if (setsockopt(s4, IPPROTO_IP, IP_IPSEC_POLICY,
389                                 buf, ipsec_get_policylen(buf)) < 0)
390                         err(1, "setsockopt(IP_IPSEC_POLICY)");
391                 free(buf);
392         }
393 #else /* IPSEC_POLICY_IPSEC */
394         if (flags->auth) {
395                 optval = IPSEC_LEVEL_REQUIRE;
396                 if (setsockopt(s4, IPPROTO_IP, IP_AUTH_TRANS_LEVEL,
397                                &optval, sizeof(optval)) == -1) {
398                         syslog(LOG_ERR, "<%s> IP_AUTH_TRANS_LEVEL: %s",
399                                __func__, strerror(errno));
400                         exit(1);
401                 }
402         }
403         if (flags->encrypt) {
404                 optval = IPSEC_LEVEL_REQUIRE;
405                 if (setsockopt(s4, IPPROTO_IP, IP_ESP_TRANS_LEVEL,
406                                 &optval, sizeof(optval)) == -1) {
407                         syslog(LOG_ERR, "<%s> IP_ESP_TRANS_LEVEL: %s",
408                                __func__, strerror(errno));
409                         exit(1);
410                 }
411         }
412 #endif /* IPSEC_POLICY_IPSEC */
413 #endif /* IPSEC */
414
415         return;
416 }
417
418 static void
419 rrenum_output(struct payload_list *pl, struct dst_list *dl)
420 {
421         int i, msglen = 0;
422         struct cmsghdr *cm;
423         struct in6_pktinfo *pi;
424         struct sockaddr_in6 *sin6 = NULL;
425
426         sndmhdr.msg_name = (caddr_t)dl->dl_dst;
427         if (dl->dl_dst->sa_family == AF_INET6)
428                 sin6 = (struct sockaddr_in6 *)dl->dl_dst;
429
430         if (sin6 != NULL &&
431             IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
432                 int hoplimit = RR_MCHLIM_DEFAULT;
433
434                 cm = CMSG_FIRSTHDR(&sndmhdr);
435                 /* specify the outgoing interface */
436                 cm->cmsg_level = IPPROTO_IPV6;
437                 cm->cmsg_type = IPV6_PKTINFO;
438                 cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
439                 pi = (struct in6_pktinfo *)CMSG_DATA(cm);
440                 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr));       /*XXX*/
441                 pi->ipi6_ifindex = sin6->sin6_scope_id;
442                 msglen += CMSG_LEN(sizeof(struct in6_pktinfo));
443
444                 /* specify the hop limit of the packet if dest is link local */
445                 /* not defined by router-renum-05.txt, but maybe its OK */
446                 cm = CMSG_NXTHDR(&sndmhdr, cm);
447                 cm->cmsg_level = IPPROTO_IPV6;
448                 cm->cmsg_type = IPV6_HOPLIMIT;
449                 cm->cmsg_len = CMSG_LEN(sizeof(int));
450                 memcpy(CMSG_DATA(cm), &hoplimit, sizeof(int));
451                 msglen += CMSG_LEN(sizeof(int));
452         }
453         sndmhdr.msg_controllen = msglen;
454         if (sndmhdr.msg_controllen == 0)
455                 sndmhdr.msg_control = 0;
456
457         sndmhdr.msg_iov = &pl->pl_sndiov;
458         i = sendmsg(dl->dl_dst->sa_family == AF_INET ? s4 : s6, &sndmhdr, 0);
459
460         if (i < 0 || i != sndmhdr.msg_iov->iov_len)
461                 syslog(LOG_ERR, "<%s> sendmsg: %s", __func__,
462                        strerror(errno));
463 }
464
465 static void
466 rrenum_snd_eachdst(struct payload_list *pl)
467 {
468         struct dst_list *dl;
469
470         for (dl = dl_head; dl; dl = dl->dl_next) {
471                 rrenum_output(pl, dl);
472         }
473 }
474
475 #if 0
476 static void
477 rrenum_snd_fullsequence(void)
478 {
479         struct payload_list *pl;
480
481         for (pl = pl_head; pl; pl = pl->pl_next) {
482                 rrenum_snd_eachdst(pl);
483         }
484 }
485 #endif
486
487 static void
488 rrenum_input(int s)
489 {
490         int i;
491         struct icmp6_router_renum *rr;
492
493         /* get message */
494         if ((i = recvmsg(s, &rcvmhdr, 0)) < 0) {
495                 syslog(LOG_ERR, "<%s> recvmsg: %s", __func__,
496                        strerror(errno));
497                 return;
498         }
499         if (s == s4)
500                 i -= sizeof(struct ip);
501         if (i < sizeof(struct icmp6_router_renum)) {
502                 syslog(LOG_ERR, "<%s> packet size(%d) is too short",
503                        __func__, i);
504                 return;
505         }
506         if (s == s4) {
507                 struct ip *ip = (struct ip *)rcvmhdr.msg_iov->iov_base;
508
509                 rr = (struct icmp6_router_renum *)(ip + 1);
510         } else /* s == s6 */
511                 rr = (struct icmp6_router_renum *)rcvmhdr.msg_iov->iov_base;
512
513         switch(rr->rr_code) {
514         case ICMP6_ROUTER_RENUMBERING_COMMAND:
515                 /* COMMAND will be processed by rtadvd */
516                 break;
517         case ICMP6_ROUTER_RENUMBERING_RESULT:
518                 /* TODO: receiving result message */
519                 break;
520         default:
521                 syslog(LOG_ERR, "<%s> received unknown code %d",
522                        __func__, rr->rr_code);
523                 break;
524         }
525 }
526
527 int
528 main(int argc, char *argv[])
529 {
530         FILE *fp = stdin;
531         fd_set fdset;
532         struct timeval timeout;
533         int ch, i, maxfd = 0, send_counter = 0;
534         struct flags flags;
535         struct payload_list *pl;
536 #ifdef IPSEC_POLICY_IPSEC
537         char *policy = NULL;
538 #endif
539
540         memset(&flags, 0, sizeof(flags));
541         openlog("rrenumd", LOG_PID, LOG_DAEMON);
542
543         /* get options */
544         while ((ch = getopt(argc, argv, "c:sdf"
545 #ifdef IPSEC
546 #ifdef IPSEC_POLICY_IPSEC
547                             "P:"
548 #else /* IPSEC_POLICY_IPSEC */
549                             "AE"
550 #endif /* IPSEC_POLICY_IPSEC */
551 #endif /* IPSEC */
552                             )) != -1){
553                 switch (ch) {
554                 case 'c':
555                         if((fp = fopen(optarg, "r")) == NULL) {
556                                 syslog(LOG_ERR,
557                                        "<%s> config file %s open failed",
558                                        __func__, optarg);
559                                 exit(1);
560                         }
561                         break;
562                 case 's':
563                         fp = stdin;
564                         break;
565                 case 'd':
566                         flags.debug = 1;
567                         break;
568                 case 'f':
569                         flags.fg = 1;
570                         break;
571 #ifdef IPSEC
572 #ifdef IPSEC_POLICY_IPSEC
573                 case 'P':
574                         flags.policy = 1;
575                         policy = strdup(optarg);
576                         break;
577 #else /* IPSEC_POLICY_IPSEC */
578                 case 'A':
579                         flags.auth = 1;
580                         break;
581                 case 'E':
582                         flags.encrypt = 1;
583                         break;
584 #endif /* IPSEC_POLICY_IPSEC */
585 #endif /*IPSEC*/
586                 default:
587                         show_usage();
588                 }
589         }
590         argc -= optind;
591         argv += optind;
592
593         /* set log level */
594         if (flags.debug == 0)
595                 setlogmask(LOG_UPTO(LOG_ERR));
596         if (flags.debug == 1)
597                 setlogmask(LOG_UPTO(LOG_INFO));
598
599         /* init global variables */
600         init_globals();
601
602         config(&fp);
603
604         sock6_open(&flags
605 #ifdef IPSEC_POLICY_IPSEC
606                    , policy
607 #endif /* IPSEC_POLICY_IPSEC */
608                    );
609         sock4_open(&flags
610 #ifdef IPSEC_POLICY_IPSEC
611                    , policy
612 #endif /* IPSEC_POLICY_IPSEC */
613                    );
614
615         if (!flags.fg)
616                 daemon(0, 0);
617
618         FD_ZERO(&fdset);
619         if (with_v6dest) {
620                 FD_SET(s6, &fdset);
621                 if (s6 > maxfd)
622                         maxfd = s6;
623         }
624         if (with_v4dest) {
625                 FD_SET(s4, &fdset);
626                 if (s4 > maxfd)
627                         maxfd = s4;
628         }
629
630         /* ADHOC: timeout each 30seconds */
631         memset(&timeout, 0, sizeof(timeout));
632
633         /* init temporary payload_list and send_counter*/
634         pl = pl_head;
635         send_counter = retry + 1;
636         while (1) {
637                 struct fd_set select_fd = fdset; /* reinitialize */
638
639                 if ((i = select(maxfd + 1, &select_fd, NULL, NULL,
640                                 &timeout)) < 0){
641                         syslog(LOG_ERR, "<%s> select: %s",
642                                __func__, strerror(errno));
643                         continue;
644                 }
645                 if (i == 0) {   /* timeout */
646                         if (pl == NULL)
647                                 exit(0);
648                         rrenum_snd_eachdst(pl);
649                         send_counter--;
650                         timeout.tv_sec = 30;
651                         if (send_counter == 0) {
652                                 timeout.tv_sec = 0;
653                                 pl = pl->pl_next;
654                                 send_counter = retry + 1;
655                         }
656                 }
657                 if (FD_ISSET(s4, &select_fd))
658                         rrenum_input(s4);
659                 if (FD_ISSET(s6, &select_fd))
660                         rrenum_input(s6);
661         }
662 }