2 * A rewrite of Darren Reeds original res.c As there is nothing
3 * left of Darrens original code, this is now licensed by the hybrid group.
4 * (Well, some of the function names are the same, and bits of the structs..)
5 * You can use it where it is useful, free even. Buy us a beer and stuff.
7 * The authors takes no responsibility for any damage or loss
8 * of property which results from the use of this software.
10 * $Id: res.c 3301 2007-03-28 15:04:06Z jilles $
11 * from Hybrid Id: res.c 459 2006-02-12 22:21:37Z db $
13 * July 1999 - Rewrote a bunch of stuff here. Change hostent builder code,
14 * added callbacks and reference counting of returned hostents.
15 * --Bleep (Thomas Helvey <tomh@inxpress.net>)
17 * This was all needlessly complicated for irc. Simplified. No more hostent
18 * All we really care about is the IP -> hostname mappings. Thats all.
20 * Apr 28, 2003 --cryogen and Dianora
22 * DNS server flooding lessened, AAAA-or-A lookup removed, ip6.int support
23 * removed, various robustness fixes
25 * 2006 --jilles and nenolod
27 * Resend queries to other servers if the DNS server replies with an error or
28 * an invalid response. Also, avoid servers that return errors or invalid
31 * October 2012 --mr_flea
35 #include "ircd_defs.h"
42 #include "client.h" /* SNO_* */
45 #error this code needs to be able to address individual octets
48 static PF res_readreply
;
50 #define MAXPACKET 1024 /* rfc sez 512 but we expand names so ... */
51 #define RES_MAXALIASES 35 /* maximum aliases allowed */
52 #define RES_MAXADDRS 35 /* maximum addresses allowed */
53 #define AR_TTL 600 /* TTL in seconds for dns cache entries */
55 /* RFC 1104/1105 wasn't very helpful about what these fields
56 * should be named, so for now, we'll just name them this way.
57 * we probably should look at what named calls them or something.
59 #define TYPE_SIZE (size_t)2
60 #define CLASS_SIZE (size_t)2
61 #define TTL_SIZE (size_t)4
62 #define RDLENGTH_SIZE (size_t)2
63 #define ANSWER_FIXED_SIZE (TYPE_SIZE + CLASS_SIZE + TTL_SIZE + RDLENGTH_SIZE)
71 char queryname
[IRCD_RES_HOSTLEN
+ 1]; /* name currently being queried */
72 char retries
; /* retry counter */
73 char sends
; /* number of sends (>1 means resent) */
76 unsigned int lastns
; /* index of last server sent to */
77 struct rb_sockaddr_storage addr
;
79 struct DNSQuery
*query
; /* query callback for this request */
82 static rb_fde_t
*res_fd
;
83 static rb_dlink_list request_list
= { NULL
, NULL
, 0 };
84 static int ns_failure_count
[IRCD_MAXNS
]; /* timeouts and invalid/failed replies */
86 static void rem_request(struct reslist
*request
);
87 static struct reslist
*make_request(struct DNSQuery
*query
);
88 static void do_query_name(struct DNSQuery
*query
, const char *name
, struct reslist
*request
, int);
89 static void do_query_number(struct DNSQuery
*query
, const struct rb_sockaddr_storage
*,
90 struct reslist
*request
);
91 static void query_name(struct reslist
*request
);
92 static int send_res_msg(const char *buf
, int len
, int count
);
93 static void resend_query(struct reslist
*request
);
94 static int check_question(struct reslist
*request
, HEADER
* header
, char *buf
, char *eob
);
95 static int proc_answer(struct reslist
*request
, HEADER
* header
, char *, char *);
96 static struct reslist
*find_id(int id
);
97 static struct DNSReply
*make_dnsreply(struct reslist
*request
);
102 * looks up "inp" in irc_nsaddr_list[]
104 * server ID or -1 for not found
106 * paul vixie, 29may94
107 * revised for ircd, cryogen(stu) may03
108 * slightly modified for charybdis, mr_flea oct12
110 static int res_ourserver(const struct rb_sockaddr_storage
*inp
)
113 const struct sockaddr_in6
*v6
;
114 const struct sockaddr_in6
*v6in
= (const struct sockaddr_in6
*)inp
;
116 const struct sockaddr_in
*v4
;
117 const struct sockaddr_in
*v4in
= (const struct sockaddr_in
*)inp
;
120 for (ns
= 0; ns
< irc_nscount
; ns
++)
122 const struct rb_sockaddr_storage
*srv
= &irc_nsaddr_list
[ns
];
124 if (srv
->ss_family
!= inp
->ss_family
)
128 v6
= (const struct sockaddr_in6
*)srv
;
130 v4
= (const struct sockaddr_in
*)srv
;
132 /* could probably just memcmp(srv, inp, srv.ss_len) here
133 * but we'll err on the side of caution - stu
135 switch (srv
->ss_family
)
139 if (v6
->sin6_port
== v6in
->sin6_port
)
140 if ((memcmp(&v6
->sin6_addr
.s6_addr
, &v6in
->sin6_addr
.s6_addr
,
141 sizeof(struct in6_addr
)) == 0) ||
142 (memcmp(&v6
->sin6_addr
.s6_addr
, &in6addr_any
,
143 sizeof(struct in6_addr
)) == 0))
150 if (v4
->sin_port
== v4in
->sin_port
)
151 if ((v4
->sin_addr
.s_addr
== INADDR_ANY
)
152 || (v4
->sin_addr
.s_addr
== v4in
->sin_addr
.s_addr
))
166 * timeout_query_list - Remove queries from the list which have been
167 * there too long without being resolved.
169 static time_t timeout_query_list(time_t now
)
172 rb_dlink_node
*next_ptr
;
173 struct reslist
*request
;
174 time_t next_time
= 0;
177 RB_DLINK_FOREACH_SAFE(ptr
, next_ptr
, request_list
.head
)
180 timeout
= request
->sentat
+ request
->timeout
;
184 ns_failure_count
[request
->lastns
]++;
185 request
->sentat
= now
;
186 request
->timeout
+= request
->timeout
;
187 resend_query(request
);
190 if ((next_time
== 0) || timeout
< next_time
)
196 return (next_time
> now
) ? next_time
: (now
+ AR_TTL
);
200 * timeout_resolver - check request list
202 static void timeout_resolver(void *notused
)
204 timeout_query_list(rb_current_time());
207 static struct ev_entry
*timeout_resolver_ev
= NULL
;
210 * start_resolver - do everything we need to read the resolv.conf file
211 * and initialize the resolver file descriptor if needed
213 static void start_resolver(void)
218 for (i
= 0; i
< irc_nscount
; i
++)
219 ns_failure_count
[i
] = 0;
223 if ((res_fd
= rb_socket(irc_nsaddr_list
[0].ss_family
, SOCK_DGRAM
, 0,
224 "UDP resolver socket")) == NULL
)
227 /* At the moment, the resolver FD data is global .. */
228 rb_setselect(res_fd
, RB_SELECT_READ
, res_readreply
, NULL
);
229 timeout_resolver_ev
= rb_event_add("timeout_resolver", timeout_resolver
, NULL
, 1);
234 * init_resolver - initialize resolver and resolver library
236 void init_resolver(void)
239 srand48(rb_current_time());
245 * restart_resolver - reread resolv.conf, reopen socket
247 void restart_resolver(void)
251 rb_event_delete(timeout_resolver_ev
); /* -ddosen */
256 * add_local_domain - Add the domain to hostname, if it is missing
257 * (as suggested by eps@TOASTER.SFSU.EDU)
259 void add_local_domain(char *hname
, size_t size
)
261 /* try to fix up unqualified names */
262 if (strchr(hname
, '.') == NULL
)
266 size_t len
= strlen(hname
);
268 if ((strlen(irc_domain
) + len
+ 2) < size
)
271 strcpy(hname
+ len
, irc_domain
);
278 * rem_request - remove a request from the list.
279 * This must also free any memory that has been allocated for
280 * temporary storage of DNS results.
282 static void rem_request(struct reslist
*request
)
284 rb_dlinkDelete(&request
->node
, &request_list
);
285 rb_free(request
->name
);
290 * make_request - Create a DNS request record for the server.
292 static struct reslist
*make_request(struct DNSQuery
*query
)
294 struct reslist
*request
= rb_malloc(sizeof(struct reslist
));
296 request
->sentat
= rb_current_time();
297 request
->retries
= 3;
298 request
->timeout
= 4; /* start at 4 and exponential inc. */
299 request
->query
= query
;
302 * generate a unique id
303 * NOTE: we don't have to worry about converting this to and from
304 * network byte order, the nameserver does not interpret this value
305 * and returns it unchanged
307 * we generate an id per request now (instead of per send) to allow
308 * late replies to be used.
313 request
->id
= (request
->id
+ lrand48()) & 0xffff;
314 } while (find_id(request
->id
));
318 gettimeofday(&tv
, NULL
);
321 request
->id
= (request
->id
+ k
+ tv
.tv_usec
) & 0xffff;
323 } while (find_id(request
->id
));
324 #endif /* HAVE_LRAND48 */
326 rb_dlinkAdd(request
, &request
->node
, &request_list
);
332 * delete_resolver_queries - cleanup outstanding queries
333 * for which there no longer exist clients or conf lines.
335 void delete_resolver_queries(const struct DNSQuery
*query
)
338 rb_dlink_node
*next_ptr
;
339 struct reslist
*request
;
341 RB_DLINK_FOREACH_SAFE(ptr
, next_ptr
, request_list
.head
)
343 if ((request
= ptr
->data
) != NULL
)
345 if (query
== request
->query
)
346 rem_request(request
);
352 * retryfreq - determine how many queries to wait before resending
353 * if there have been that many consecutive timeouts
355 static int retryfreq(int timeouts
)
373 * send_res_msg - sends msg to a nameserver.
374 * This should reflect /etc/resolv.conf.
375 * Returns number of nameserver successfully sent to
376 * or -1 if no successful sends.
378 static int send_res_msg(const char *msg
, int len
, int rcount
)
385 /* First try a nameserver that seems to work.
386 * Every once in a while, try a possibly broken one to check
387 * if it is working again.
389 for (i
= 0; i
< irc_nscount
; i
++)
391 ns
= (i
+ rcount
- 1) % irc_nscount
;
392 if (ns_failure_count
[ns
] && retrycnt
% retryfreq(ns_failure_count
[ns
]))
394 if (sendto(rb_get_fd(res_fd
), msg
, len
, 0,
395 (struct sockaddr
*)&(irc_nsaddr_list
[ns
]),
396 GET_SS_LEN(&irc_nsaddr_list
[ns
])) == len
)
400 /* No known working nameservers, try some broken one. */
401 for (i
= 0; i
< irc_nscount
; i
++)
403 ns
= (i
+ rcount
- 1) % irc_nscount
;
404 if (!ns_failure_count
[ns
])
406 if (sendto(rb_get_fd(res_fd
), msg
, len
, 0,
407 (struct sockaddr
*)&(irc_nsaddr_list
[ns
]),
408 GET_SS_LEN(&irc_nsaddr_list
[ns
])) == len
)
416 * find_id - find a dns request id (id is determined by dn_mkquery)
418 static struct reslist
*find_id(int id
)
421 struct reslist
*request
;
423 RB_DLINK_FOREACH(ptr
, request_list
.head
)
427 if (request
->id
== id
)
435 * gethost_byname_type - get host address from name
438 void gethost_byname_type(const char *name
, struct DNSQuery
*query
, int type
)
441 do_query_name(query
, name
, NULL
, type
);
445 * gethost_byaddr - get host name from address
447 void gethost_byaddr(const struct rb_sockaddr_storage
*addr
, struct DNSQuery
*query
)
449 do_query_number(query
, addr
, NULL
);
453 * do_query_name - nameserver lookup name
455 static void do_query_name(struct DNSQuery
*query
, const char *name
, struct reslist
*request
,
458 char host_name
[IRCD_RES_HOSTLEN
+ 1];
460 rb_strlcpy(host_name
, name
, IRCD_RES_HOSTLEN
+ 1);
461 add_local_domain(host_name
, IRCD_RES_HOSTLEN
);
465 request
= make_request(query
);
466 request
->name
= (char *)rb_malloc(strlen(host_name
) + 1);
467 strcpy(request
->name
, host_name
);
470 rb_strlcpy(request
->queryname
, host_name
, sizeof(request
->queryname
));
471 request
->type
= type
;
476 * do_query_number - Use this to do reverse IP# lookups.
478 static void do_query_number(struct DNSQuery
*query
, const struct rb_sockaddr_storage
*addr
,
479 struct reslist
*request
)
481 const unsigned char *cp
;
485 request
= make_request(query
);
486 memcpy(&request
->addr
, addr
, sizeof(struct rb_sockaddr_storage
));
487 request
->name
= (char *)rb_malloc(IRCD_RES_HOSTLEN
+ 1);
490 if (addr
->ss_family
== AF_INET
)
492 const struct sockaddr_in
*v4
= (const struct sockaddr_in
*)addr
;
493 cp
= (const unsigned char *)&v4
->sin_addr
.s_addr
;
495 rb_sprintf(request
->queryname
, "%u.%u.%u.%u.in-addr.arpa", (unsigned int)(cp
[3]),
496 (unsigned int)(cp
[2]), (unsigned int)(cp
[1]), (unsigned int)(cp
[0]));
499 else if (addr
->ss_family
== AF_INET6
)
501 const struct sockaddr_in6
*v6
= (const struct sockaddr_in6
*)addr
;
502 cp
= (const unsigned char *)&v6
->sin6_addr
.s6_addr
;
504 (void)sprintf(request
->queryname
, "%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x."
505 "%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.ip6.arpa",
506 (unsigned int)(cp
[15] & 0xf), (unsigned int)(cp
[15] >> 4),
507 (unsigned int)(cp
[14] & 0xf), (unsigned int)(cp
[14] >> 4),
508 (unsigned int)(cp
[13] & 0xf), (unsigned int)(cp
[13] >> 4),
509 (unsigned int)(cp
[12] & 0xf), (unsigned int)(cp
[12] >> 4),
510 (unsigned int)(cp
[11] & 0xf), (unsigned int)(cp
[11] >> 4),
511 (unsigned int)(cp
[10] & 0xf), (unsigned int)(cp
[10] >> 4),
512 (unsigned int)(cp
[9] & 0xf), (unsigned int)(cp
[9] >> 4),
513 (unsigned int)(cp
[8] & 0xf), (unsigned int)(cp
[8] >> 4),
514 (unsigned int)(cp
[7] & 0xf), (unsigned int)(cp
[7] >> 4),
515 (unsigned int)(cp
[6] & 0xf), (unsigned int)(cp
[6] >> 4),
516 (unsigned int)(cp
[5] & 0xf), (unsigned int)(cp
[5] >> 4),
517 (unsigned int)(cp
[4] & 0xf), (unsigned int)(cp
[4] >> 4),
518 (unsigned int)(cp
[3] & 0xf), (unsigned int)(cp
[3] >> 4),
519 (unsigned int)(cp
[2] & 0xf), (unsigned int)(cp
[2] >> 4),
520 (unsigned int)(cp
[1] & 0xf), (unsigned int)(cp
[1] >> 4),
521 (unsigned int)(cp
[0] & 0xf), (unsigned int)(cp
[0] >> 4));
525 request
->type
= T_PTR
;
530 * query_name - generate a query based on class, type and name.
532 static void query_name(struct reslist
*request
)
538 memset(buf
, 0, sizeof(buf
));
541 irc_res_mkquery(request
->queryname
, C_IN
, request
->type
, (unsigned char *)buf
, sizeof(buf
))) > 0)
543 HEADER
*header
= (HEADER
*) buf
;
544 header
->id
= request
->id
;
547 ns
= send_res_msg(buf
, request_len
, request
->sends
);
549 request
->lastns
= ns
;
553 static void resend_query(struct reslist
*request
)
555 if (--request
->retries
<= 0)
557 (*request
->query
->callback
) (request
->query
->ptr
, NULL
);
558 rem_request(request
);
562 switch (request
->type
)
565 do_query_number(NULL
, &request
->addr
, request
);
571 do_query_name(NULL
, request
->name
, request
, request
->type
);
579 * check_question - check if the reply really belongs to the
580 * name we queried (to guard against late replies from previous
581 * queries with the same id).
583 static int check_question(struct reslist
*request
, HEADER
* header
, char *buf
, char *eob
)
585 char hostbuf
[IRCD_RES_HOSTLEN
+ 1]; /* working buffer */
586 unsigned char *current
; /* current position in buf */
587 int n
; /* temp count */
589 current
= (unsigned char *)buf
+ sizeof(HEADER
);
590 if (header
->qdcount
!= 1)
592 n
= irc_dn_expand((unsigned char *)buf
, (unsigned char *)eob
, current
, hostbuf
,
596 if (strcasecmp(hostbuf
, request
->queryname
))
602 * proc_answer - process name server reply
604 static int proc_answer(struct reslist
*request
, HEADER
* header
, char *buf
, char *eob
)
606 char hostbuf
[IRCD_RES_HOSTLEN
+ 100]; /* working buffer */
607 unsigned char *current
; /* current position in buf */
608 int query_class
; /* answer class */
609 int type
; /* answer type */
610 int n
; /* temp count */
612 struct sockaddr_in
*v4
; /* conversion */
614 struct sockaddr_in6
*v6
;
616 current
= (unsigned char *)buf
+ sizeof(HEADER
);
618 for (; header
->qdcount
> 0; --header
->qdcount
)
620 if ((n
= irc_dn_skipname(current
, (unsigned char *)eob
)) < 0)
623 current
+= (size_t) n
+ QFIXEDSZ
;
627 * process each answer sent to us blech.
629 while (header
->ancount
> 0 && (char *)current
< eob
)
633 n
= irc_dn_expand((unsigned char *)buf
, (unsigned char *)eob
, current
, hostbuf
,
646 * no more answers left
651 hostbuf
[IRCD_RES_HOSTLEN
] = '\0';
653 /* With Address arithmetic you have to be very anal
654 * this code was not working on alpha due to that
655 * (spotted by rodder/jailbird/dianora)
657 current
+= (size_t) n
;
659 if (!(((char *)current
+ ANSWER_FIXED_SIZE
) < eob
))
662 type
= irc_ns_get16(current
);
663 current
+= TYPE_SIZE
;
665 query_class
= irc_ns_get16(current
);
666 current
+= CLASS_SIZE
;
668 request
->ttl
= irc_ns_get32(current
);
671 rd_length
= irc_ns_get16(current
);
672 current
+= RDLENGTH_SIZE
;
675 * Wait to set request->type until we verify this structure
680 if (request
->type
!= T_A
)
684 * check for invalid rd_length or too many addresses
686 if (rd_length
!= sizeof(struct in_addr
))
688 v4
= (struct sockaddr_in
*)&request
->addr
;
689 SET_SS_LEN(&request
->addr
, sizeof(struct sockaddr_in
));
690 v4
->sin_family
= AF_INET
;
691 memcpy(&v4
->sin_addr
, current
, sizeof(struct in_addr
));
696 if (request
->type
!= T_AAAA
)
698 if (rd_length
!= sizeof(struct in6_addr
))
700 SET_SS_LEN(&request
->addr
, sizeof(struct sockaddr_in6
));
701 v6
= (struct sockaddr_in6
*)&request
->addr
;
702 v6
->sin6_family
= AF_INET6
;
703 memcpy(&v6
->sin6_addr
, current
, sizeof(struct in6_addr
));
708 if (request
->type
!= T_PTR
)
710 n
= irc_dn_expand((unsigned char *)buf
, (unsigned char *)eob
, current
,
711 hostbuf
, sizeof(hostbuf
));
713 return (0); /* broken message */
715 return (0); /* no more answers left */
717 rb_strlcpy(request
->name
, hostbuf
, IRCD_RES_HOSTLEN
+ 1);
722 /* real answer will follow */
723 current
+= rd_length
;
727 /* XXX I'd rather just throw away the entire bogus thing
728 * but its possible its just a broken nameserver with still
729 * valid answers. But lets do some rudimentary logging for now...
731 ilog(L_MAIN
, "irc_res.c bogus type %d", type
);
740 * res_read_single_reply - read a dns reply from the nameserver and process it.
741 * Return value: 1 if a packet was read, 0 otherwise
743 static int res_read_single_reply(rb_fde_t
*F
, void *data
)
745 char buf
[sizeof(HEADER
) + MAXPACKET
]
746 /* Sparc and alpha need 16bit-alignment for accessing header->id
747 * (which is uint16_t). Because of the header = (HEADER*) buf;
748 * lateron, this is neeeded. --FaUl
750 #if defined(__sparc__) || defined(__alpha__)
751 __attribute__ ((aligned(16)))
755 struct reslist
*request
= NULL
;
756 struct DNSReply
*reply
= NULL
;
759 socklen_t len
= sizeof(struct rb_sockaddr_storage
);
760 struct rb_sockaddr_storage lsin
;
763 rc
= recvfrom(rb_get_fd(F
), buf
, sizeof(buf
), 0, (struct sockaddr
*)&lsin
, &len
);
766 if (rc
== 0 || rc
== -1)
770 if (rc
<= (int)(sizeof(HEADER
)))
774 * convert DNS reply reader from Network byte order to CPU byte order.
776 header
= (HEADER
*) buf
;
777 header
->ancount
= ntohs(header
->ancount
);
778 header
->qdcount
= ntohs(header
->qdcount
);
779 header
->nscount
= ntohs(header
->nscount
);
780 header
->arcount
= ntohs(header
->arcount
);
783 * response for an id which we have already received an answer for
784 * just ignore this response.
786 if (0 == (request
= find_id(header
->id
)))
790 * check against possibly fake replies
792 ns
= res_ourserver(&lsin
);
796 if (ns
!= request
->lastns
)
799 * We'll accept the late reply, but penalize it a little more to make
800 * sure a laggy server doesn't end up favored.
802 ns_failure_count
[ns
] += 3;
806 if (!check_question(request
, header
, buf
, buf
+ rc
))
809 if ((header
->rcode
!= NO_ERRORS
) || (header
->ancount
== 0))
812 * RFC 2136 states that in the event of a server returning SERVFAIL
813 * or NOTIMP, the request should be resent to the next server.
814 * Additionally, if the server refuses our query, resend it as well.
817 if (SERVFAIL
== header
->rcode
|| NOTIMP
== header
->rcode
||
818 REFUSED
== header
->rcode
)
820 ns_failure_count
[ns
]++;
821 resend_query(request
);
826 * Either a fatal error was returned or no answer. Cancel the
829 if (NXDOMAIN
== header
->rcode
)
831 /* If the rcode is NXDOMAIN, treat it as a good response. */
832 ns_failure_count
[ns
] /= 4;
834 (*request
->query
->callback
) (request
->query
->ptr
, NULL
);
835 rem_request(request
);
840 * If this fails there was an error decoding the received packet.
843 answer_count
= proc_answer(request
, header
, buf
, buf
+ rc
);
847 if (request
->type
== T_PTR
)
849 if (request
->name
== NULL
)
852 * Got a PTR response with no name, something strange is
853 * happening. Try another DNS server.
855 ns_failure_count
[ns
]++;
856 resend_query(request
);
861 * Lookup the 'authoritative' name that we were given for the
865 if (request
->addr
.ss_family
== AF_INET6
)
866 gethost_byname_type(request
->name
, request
->query
, T_AAAA
);
869 gethost_byname_type(request
->name
, request
->query
, T_A
);
870 rem_request(request
);
875 * got a name and address response, client resolved
877 reply
= make_dnsreply(request
);
878 (*request
->query
->callback
) (request
->query
->ptr
, reply
);
880 rem_request(request
);
883 ns_failure_count
[ns
] /= 4;
887 /* Invalid or corrupt reply - try another resolver. */
888 ns_failure_count
[ns
]++;
889 resend_query(request
);
894 static void res_readreply(rb_fde_t
*F
, void *data
)
896 while (res_read_single_reply(F
, data
))
898 rb_setselect(F
, RB_SELECT_READ
, res_readreply
, NULL
);
901 static struct DNSReply
*make_dnsreply(struct reslist
*request
)
904 s_assert(request
!= 0);
906 cp
= (struct DNSReply
*)rb_malloc(sizeof(struct DNSReply
));
908 cp
->h_name
= request
->name
;
909 memcpy(&cp
->addr
, &request
->addr
, sizeof(cp
->addr
));
913 void report_dns_servers(struct Client
*source_p
)
918 for (i
= 0; i
< irc_nscount
; i
++)
920 if (!rb_inet_ntop_sock((struct sockaddr
*)&(irc_nsaddr_list
[i
]),
921 ipaddr
, sizeof ipaddr
))
922 rb_strlcpy(ipaddr
, "?", sizeof ipaddr
);
923 sendto_one_numeric(source_p
, RPL_STATSDEBUG
,
924 "A %s %d", ipaddr
, ns_failure_count
[i
]);