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root/svn/ircd-hybrid/trunk/src/res.c

Comparing ircd-hybrid-7.2/src/irc_res.c (file contents):
Revision 985 by michael, Sat Aug 15 20:31:54 2009 UTC vs.
Revision 1011 by michael, Fri Sep 18 10:14:09 2009 UTC

#	Line 20 | Line 20
20		*/
21
22		#include "stdinc.h"
23	–	#include "tools.h"
24	–	#include "client.h"
23		#include "list.h"
24	<	#include "common.h"
24	>	#include "balloc.h"
25	>	#include "client.h"
26		#include "event.h"
27		#include "irc_string.h"
28		#include "sprintf_irc.h"
29		#include "ircd.h"
30		#include "numeric.h"
32	–	#include "restart.h"
31		#include "rng_mt.h"
32		#include "fdlist.h"
33		#include "fileio.h" /* for fbopen / fbclose / fbputs */
#	Line 40 | Line 38
38		#include "irc_res.h"
39		#include "irc_reslib.h"
40		#include "irc_getnameinfo.h"
41	+	#include "common.h"
42
43		#if (CHAR_BIT != 8)
44		#error this code needs to be able to address individual octets
#	Line 88 | Line 87 | struct reslist
87		time_t timeout;
88		struct irc_ssaddr addr;
89		char *name;
90	<	struct DNSQuery *query;  /* query callback for this request */
90	>	dns_callback_fnc callback;
91	>	void *callback_ctx;
92		};
93
94		static fde_t ResolverFileDescriptor;
95	<	static dlink_list request_list    = { NULL, NULL, 0 };
95	>	static dlink_list request_list = { NULL, NULL, 0 };
96	>	static BlockHeap *dns_heap = NULL;
97
98		static void rem_request(struct reslist *request);
99	<	static struct reslist *make_request(struct DNSQuery *query);
100	<	static void do_query_name(struct DNSQuery *query,
101	<	const char* name, struct reslist *request, int);
102	<	static void do_query_number(struct DNSQuery *query,
99	>	static struct reslist *make_request(dns_callback_fnc callback, void *);
100	>	static void do_query_name(dns_callback_fnc callback, void *,
101	>	const char *, struct reslist *, int);
102	>	static void do_query_number(dns_callback_fnc callback, void *ctx,
103		const struct irc_ssaddr *,
104		struct reslist *request);
105		static void query_name(const char *name, int query_class, int query_type,
#	Line 107 | Line 108 | static int send_res_msg(const char *buf,
108		static void resend_query(struct reslist *request);
109		static int proc_answer(struct reslist *request, HEADER *header, char *, char *);
110		static struct reslist *find_id(int id);
110	–	static struct DNSReply *make_dnsreply(struct reslist *request);
111	–
112	–	extern struct irc_ssaddr irc_nsaddr_list[IRCD_MAXNS];
113	–	extern int irc_nscount;
114	–	extern char irc_domain[HOSTLEN+1];
111
112
113		/*
#	Line 129 | Line 125 | static int
125		res_ourserver(const struct irc_ssaddr *inp)
126		{
127		#ifdef IPV6
128	<	struct sockaddr_in6 *v6;
129	<	struct sockaddr_in6 *v6in = (struct sockaddr_in6 *)inp;
128	>	const struct sockaddr_in6 *v6;
129	>	const struct sockaddr_in6 *v6in = (const struct sockaddr_in6 *)inp;
130		#endif
131	<	struct sockaddr_in *v4;
132	<	struct sockaddr_in *v4in = (struct sockaddr_in *)inp;
131	>	const struct sockaddr_in *v4;
132	>	const struct sockaddr_in *v4in = (const struct sockaddr_in *)inp;
133		int ns;
134
135		for (ns = 0; ns < irc_nscount; ns++)
136		{
137		const struct irc_ssaddr *srv = &irc_nsaddr_list[ns];
138		#ifdef IPV6
139	<	v6 = (struct sockaddr_in6 *)srv;
139	>	v6 = (const struct sockaddr_in6 *)srv;
140		#endif
141	<	v4 = (struct sockaddr_in *)srv;
141	>	v4 = (const struct sockaddr_in *)srv;
142
143		/* could probably just memcmp(srv, inp, srv.ss_len) here
144		* but we'll air on the side of caution - stu
#	Line 198 | Line 194 | timeout_query_list(time_t now)
194		{
195		if (--request->retries <= 0)
196		{
197	<	(*request->query->callback)(request->query->ptr, NULL);
197	>	(*request->callback)(request->callback_ctx, NULL, NULL);
198		rem_request(request);
199		continue;
200		}
#	Line 256 | Line 252 | start_resolver(void)
252		void
253		init_resolver(void)
254		{
255	+	dns_heap = BlockHeapCreate("dns", sizeof(struct reslist), DNS_HEAP_SIZE);
256		memset(&ResolverFileDescriptor, 0, sizeof(fde_t));
257		start_resolver();
258		}
#	Line 272 | Line 269 | restart_resolver(void)
269		}
270
271		/*
275	–	* add_local_domain - Add the domain to hostname, if it is missing
276	–	* (as suggested by eps@TOASTER.SFSU.EDU)
277	–	*/
278	–	void
279	–	add_local_domain(char *hname, size_t size)
280	–	{
281	–	/* try to fix up unqualified names
282	–	*/
283	–	if (strchr(hname, '.') == NULL)
284	–	{
285	–	if (irc_domain[0])
286	–	{
287	–	size_t len = strlen(hname);
288	–
289	–	if ((strlen(irc_domain) + len + 2) < size)
290	–	{
291	–	hname[len++] = '.';
292	–	strcpy(hname + len, irc_domain);
293	–	}
294	–	}
295	–	}
296	–	}
297	–
298	–	/*
272		* rem_request - remove a request from the list.
273		* This must also free any memory that has been allocated for
274		* temporary storage of DNS results.
#	Line 304 | Line 277 | static void
277		rem_request(struct reslist *request)
278		{
279		dlinkDelete(&request->node, &request_list);
280	+
281		MyFree(request->name);
282	<	MyFree(request);
282	>	BlockHeapFree(dns_heap, request);
283		}
284
285		/*
286		* make_request - Create a DNS request record for the server.
287		*/
288		static struct reslist *
289	<	make_request(struct DNSQuery* query)
289	>	make_request(dns_callback_fnc callback, void *ctx)
290		{
291	<	struct reslist *request;
318	<
319	<	request = (struct reslist *)MyMalloc(sizeof(struct reslist));
291	>	struct reslist *request = BlockHeapAlloc(dns_heap);
292
293	<	request->sentat  = CurrentTime;
294	<	request->retries = 3;
295	<	request->resend  = 1;
296	<	request->timeout = 4;    /* start at 4 and exponential inc. */
297	<	request->query   = query;
298	<	request->state   = REQ_IDLE;
293	>	request->sentat       = CurrentTime;
294	>	request->retries      = 3;
295	>	request->resend       = 1;
296	>	request->timeout      = 4;    /* start at 4 and exponential inc. */
297	>	request->state        = REQ_IDLE;
298	>	request->callback     = callback;
299	>	request->callback_ctx = ctx;
300
301		dlinkAdd(request, &request->node, &request_list);
302	<	return(request);
302	>	return request;
303		}
304
305		/*
#	Line 334 | Line 307 | make_request(struct DNSQuery* query)
307		* for which there no longer exist clients or conf lines.
308		*/
309		void
310	<	delete_resolver_queries(const struct DNSQuery *query)
310	>	delete_resolver_queries(const void *vptr)
311		{
312	<	dlink_node *ptr;
340	<	dlink_node *next_ptr;
341	<	struct reslist *request;
312	>	dlink_node *ptr = NULL, *next_ptr = NULL;
313
314		DLINK_FOREACH_SAFE(ptr, next_ptr, request_list.head)
315		{
316	<	if ((request = ptr->data) != NULL)
317	<	{
318	<	if (query == request->query)
319	<	rem_request(request);
349	<	}
316	>	struct reslist *request = ptr->data;
317	>
318	>	if (request->callback_ctx == vptr)
319	>	rem_request(request);
320		}
321		}
322
#	Line 406 | Line 376 | find_id(int id)
376		*
377		*/
378		void
379	<	gethost_byname_type(const char *name, struct DNSQuery *query, int type)
379	>	gethost_byname_type(dns_callback_fnc callback, void *ctx, const char *name, int type)
380		{
381		assert(name != 0);
382	<	do_query_name(query, name, NULL, type);
382	>	do_query_name(callback, ctx, name, NULL, type);
383		}
384
385		/*
386		* gethost_byname - wrapper for _type - send T_AAAA first if IPV6 supported
387		*/
388		void
389	<	gethost_byname(const char *name, struct DNSQuery *query)
389	>	gethost_byname(dns_callback_fnc callback, void *ctx, const char *name)
390		{
391		#ifdef IPV6
392	<	gethost_byname_type(name, query, T_AAAA);
392	>	gethost_byname_type(callback, ctx, name, T_AAAA);
393		#else
394	<	gethost_byname_type(name, query, T_A);
394	>	gethost_byname_type(callback, ctx, name, T_A);
395		#endif
396		}
397
#	Line 429 | Line 399 | gethost_byname(const char *name, struct
399		* gethost_byaddr - get host name from address
400		*/
401		void
402	<	gethost_byaddr(const struct irc_ssaddr *addr, struct DNSQuery *query)
402	>	gethost_byaddr(dns_callback_fnc callback, void *ctx, const struct irc_ssaddr *addr)
403		{
404	<	do_query_number(query, addr, NULL);
404	>	do_query_number(callback, ctx, addr, NULL);
405		}
406
407		/*
408		* do_query_name - nameserver lookup name
409		*/
410		static void
411	<	do_query_name(struct DNSQuery *query, const char *name,
411	>	do_query_name(dns_callback_fnc callback, void *ctx, const char *name,
412		struct reslist *request, int type)
413		{
414		char host_name[HOSTLEN + 1];
415
416	<	strlcpy(host_name, name, HOSTLEN);
447	<	add_local_domain(host_name, HOSTLEN);
416	>	strlcpy(host_name, name, sizeof(host_name));
417
418		if (request == NULL)
419		{
420	<	request       = make_request(query);
421	<	request->name = (char *)MyMalloc(strlen(host_name) + 1);
420	>	request       = make_request(callback, ctx);
421	>	request->name = MyMalloc(strlen(host_name) + 1);
422		request->type = type;
423		strcpy(request->name, host_name);
424		#ifdef IPV6
#	Line 468 | Line 437 | do_query_name(struct DNSQuery *query, co
437		* do_query_number - Use this to do reverse IP# lookups.
438		*/
439		static void
440	<	do_query_number(struct DNSQuery *query, const struct irc_ssaddr *addr,
440	>	do_query_number(dns_callback_fnc callback, void *ctx,
441	>	const struct irc_ssaddr *addr,
442		struct reslist *request)
443		{
444		char ipbuf[128];
#	Line 476 | Line 446 | do_query_number(struct DNSQuery *query,
446
447		if (addr->ss.ss_family == AF_INET)
448		{
449	<	struct sockaddr_in *v4 = (struct sockaddr_in *)addr;
449	>	const struct sockaddr_in *v4 = (const struct sockaddr_in *)addr;
450		cp = (const unsigned char*)&v4->sin_addr.s_addr;
451
452		ircsprintf(ipbuf, "%u.%u.%u.%u.in-addr.arpa.",
#	Line 486 | Line 456 | do_query_number(struct DNSQuery *query,
456		#ifdef IPV6
457		else if (addr->ss.ss_family == AF_INET6)
458		{
459	<	struct sockaddr_in6 *v6 = (struct sockaddr_in6 *)addr;
459	>	const struct sockaddr_in6 *v6 = (const struct sockaddr_in6 *)addr;
460		cp = (const unsigned char *)&v6->sin6_addr.s6_addr;
461
462		sprintf(ipbuf, "%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x."
#	Line 511 | Line 481 | do_query_number(struct DNSQuery *query,
481		#endif
482		if (request == NULL)
483		{
484	<	request       = make_request(query);
484	>	request       = make_request(callback, ctx);
485		request->type = T_PTR;
486		memcpy(&request->addr, addr, sizeof(struct irc_ssaddr));
487	<	request->name = (char *)MyMalloc(HOSTLEN + 1);
487	>	request->name = MyMalloc(HOSTLEN + 1);
488		}
489
490		query_name(ipbuf, C_IN, T_PTR, request);
#	Line 563 | Line 533 | resend_query(struct reslist *request)
533		switch (request->type)
534		{
535		case T_PTR:
536	<	do_query_number(NULL, &request->addr, request);
536	>	do_query_number(NULL, NULL, &request->addr, request);
537		break;
538		case T_A:
539	<	do_query_name(NULL, request->name, request, request->type);
539	>	do_query_name(NULL, NULL, request->name, request, request->type);
540		break;
541		#ifdef IPV6
542		case T_AAAA:
543		/* didnt work, try A */
544		if (request->state == REQ_AAAA)
545	<	do_query_name(NULL, request->name, request, T_A);
545	>	do_query_name(NULL, NULL, request->name, request, T_A);
546		#endif
547		default:
548		break;
#	Line 696 | Line 666 | proc_answer(struct reslist *request, HEA
666		else if (n == 0)
667		return(0); /* no more answers left */
668
669	<	strlcpy(request->name, hostbuf, HOSTLEN);
669	>	strlcpy(request->name, hostbuf, HOSTLEN + 1);
670
671		return(1);
672		break;
#	Line 749 | Line 719 | res_readreply(fde_t *fd, void *data)
719		;
720		HEADER *header;
721		struct reslist *request = NULL;
752	–	struct DNSReply *reply  = NULL;
722		int rc;
754	–	int answer_count;
723		socklen_t len = sizeof(struct irc_ssaddr);
724		struct irc_ssaddr lsin;
725
#	Line 776 | Line 744 | res_readreply(fde_t *fd, void *data)
744		header->arcount = ntohs(header->arcount);
745
746		/*
747	<	* response for an id which we have already received an answer for
780	<	* just ignore this response.
747	>	* check against possibly fake replies
748		*/
749	<	if (0 == (request = find_id(header->id)))
749	>	if (!res_ourserver(&lsin))
750		return;
751
752		/*
753	<	* check against possibly fake replies
753	>	* response for an id which we have already received an answer for
754	>	* just ignore this response.
755		*/
756	<	if (!res_ourserver(&lsin))
756	>	if (!(request = find_id(header->id)))
757		return;
758
759		if ((header->rcode != NO_ERRORS) || (header->ancount == 0))
#	Line 796 | Line 764 | res_readreply(fde_t *fd, void *data)
764		* If a bad error was returned, stop here and don't
765		* send any more (no retries granted).
766		*/
767	<	(*request->query->callback)(request->query->ptr, NULL);
767	>	(*request->callback)(request->callback_ctx, NULL, NULL);
768		rem_request(request);
769		}
770		#ifdef IPV6
#	Line 821 | Line 789 | res_readreply(fde_t *fd, void *data)
789		* If this fails there was an error decoding the received packet,
790		* try it again and hope it works the next time.
791		*/
792	<	answer_count = proc_answer(request, header, buf, buf + rc);
825	<
826	<	if (answer_count)
792	>	if (proc_answer(request, header, buf, buf + rc))
793		{
794		if (request->type == T_PTR)
795		{
#	Line 833 | Line 799 | res_readreply(fde_t *fd, void *data)
799		* got a PTR response with no name, something bogus is happening
800		* don't bother trying again, the client address doesn't resolve
801		*/
802	<	(*request->query->callback)(request->query->ptr, reply);
802	>	(*request->callback)(request->callback_ctx, NULL, NULL);
803		rem_request(request);
804		return;
805		}
#	Line 845 | Line 811 | res_readreply(fde_t *fd, void *data)
811		*/
812		#ifdef IPV6
813		if (request->addr.ss.ss_family == AF_INET6)
814	<	gethost_byname_type(request->name, request->query, T_AAAA);
814	>	gethost_byname_type(request->callback, request->callback_ctx, request->name, T_AAAA);
815		else
816		#endif
817	<	gethost_byname_type(request->name, request->query, T_A);
817	>	gethost_byname_type(request->callback, request->callback_ctx, request->name, T_A);
818		rem_request(request);
819		}
820		else
#	Line 856 | Line 822 | res_readreply(fde_t *fd, void *data)
822		/*
823		* got a name and address response, client resolved
824		*/
825	<	reply = make_dnsreply(request);
860	<	(*request->query->callback)(request->query->ptr, reply);
861	<	MyFree(reply);
825	>	(*request->callback)(request->callback_ctx, &request->addr, request->name);
826		rem_request(request);
827		}
828		}
#	Line 874 | Line 838 | res_readreply(fde_t *fd, void *data)
838		}
839		}
840
877	–	static struct DNSReply *
878	–	make_dnsreply(struct reslist *request)
879	–	{
880	–	struct DNSReply *cp;
881	–	assert(request != 0);
882	–
883	–	cp = (struct DNSReply *)MyMalloc(sizeof(struct DNSReply));
884	–
885	–	cp->h_name = request->name;
886	–	memcpy(&cp->addr, &request->addr, sizeof(cp->addr));
887	–	return(cp);
888	–	}
889	–
841		void
842		report_dns_servers(struct Client *source_p)
843		{
844		int i;
845	<	char ipaddr[HOSTIPLEN];
845	>	char ipaddr[HOSTIPLEN + 1];
846
847		for (i = 0; i < irc_nscount; i++)
848		{
849		irc_getnameinfo((struct sockaddr *)&(irc_nsaddr_list[i]),
850	<	irc_nsaddr_list[i].ss_len, ipaddr, HOSTIPLEN, NULL, 0,
851	<	NI_NUMERICHOST);
850	>	irc_nsaddr_list[i].ss_len, ipaddr,
851	>	sizeof(ipaddr), NULL, 0, NI_NUMERICHOST);
852		sendto_one(source_p, form_str(RPL_STATSALINE),
853		me.name, source_p->name, ipaddr);
854		}

Diff Legend

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