1 /* SPDX-License-Identifier: LGPL-2.1+ */
12 #include <sys/prctl.h>
15 #include "sd-resolve.h"
17 #include "alloc-util.h"
18 #include "dns-domain.h"
19 #include "errno-util.h"
23 #include "memory-util.h"
24 #include "missing_syscall.h"
25 #include "process-util.h"
26 #include "resolve-private.h"
27 #include "socket-util.h"
29 #define WORKERS_MIN 1U
30 #define WORKERS_MAX 16U
31 #define QUERIES_MAX 256U
32 #define BUFSIZE 10240U
59 pthread_t workers
[WORKERS_MAX
];
60 unsigned n_valid_workers
;
63 sd_resolve_query
* query_array
[QUERIES_MAX
];
64 unsigned n_queries
, n_done
, n_outstanding
;
66 sd_event_source
*event_source
;
69 sd_resolve_query
*current
;
71 sd_resolve
**default_resolve_ptr
;
74 LIST_HEAD(sd_resolve_query
, queries
);
77 struct sd_resolve_query
{
90 struct addrinfo
*addrinfo
;
94 sd_resolve_getaddrinfo_handler_t getaddrinfo_handler
;
95 sd_resolve_getnameinfo_handler_t getnameinfo_handler
;
99 sd_resolve_destroy_t destroy_callback
;
101 LIST_FIELDS(sd_resolve_query
, queries
);
104 typedef struct RHeader
{
110 typedef struct AddrInfoRequest
{
111 struct RHeader header
;
117 size_t node_len
, service_len
;
120 typedef struct AddrInfoResponse
{
121 struct RHeader header
;
125 /* followed by addrinfo_serialization[] */
128 typedef struct AddrInfoSerialization
{
134 size_t canonname_len
;
135 /* Followed by ai_addr amd ai_canonname with variable lengths */
136 } AddrInfoSerialization
;
138 typedef struct NameInfoRequest
{
139 struct RHeader header
;
141 socklen_t sockaddr_len
;
142 bool gethost
:1, getserv
:1;
145 typedef struct NameInfoResponse
{
146 struct RHeader header
;
147 size_t hostlen
, servlen
;
153 typedef union Packet
{
155 AddrInfoRequest addrinfo_request
;
156 AddrInfoResponse addrinfo_response
;
157 NameInfoRequest nameinfo_request
;
158 NameInfoResponse nameinfo_response
;
161 static int getaddrinfo_done(sd_resolve_query
* q
);
162 static int getnameinfo_done(sd_resolve_query
*q
);
164 static void resolve_query_disconnect(sd_resolve_query
*q
);
166 #define RESOLVE_DONT_DESTROY(resolve) \
167 _cleanup_(sd_resolve_unrefp) _unused_ sd_resolve *_dont_destroy_##resolve = sd_resolve_ref(resolve)
169 static void query_assign_errno(sd_resolve_query
*q
, int ret
, int error
, int h_error
) {
173 q
->_errno
= abs(error
);
174 q
->_h_errno
= h_error
;
177 static int send_died(int out_fd
) {
179 .type
= RESPONSE_DIED
,
180 .length
= sizeof(RHeader
),
185 if (send(out_fd
, &rh
, rh
.length
, MSG_NOSIGNAL
) < 0)
191 static void *serialize_addrinfo(void *p
, const struct addrinfo
*ai
, size_t *length
, size_t maxlength
) {
192 AddrInfoSerialization s
;
198 assert(*length
<= maxlength
);
200 cnl
= ai
->ai_canonname
? strlen(ai
->ai_canonname
)+1 : 0;
201 l
= sizeof(AddrInfoSerialization
) + ai
->ai_addrlen
+ cnl
;
203 if (*length
+ l
> maxlength
)
206 s
= (AddrInfoSerialization
) {
207 .ai_flags
= ai
->ai_flags
,
208 .ai_family
= ai
->ai_family
,
209 .ai_socktype
= ai
->ai_socktype
,
210 .ai_protocol
= ai
->ai_protocol
,
211 .ai_addrlen
= ai
->ai_addrlen
,
212 .canonname_len
= cnl
,
215 memcpy((uint8_t*) p
, &s
, sizeof(AddrInfoSerialization
));
216 memcpy((uint8_t*) p
+ sizeof(AddrInfoSerialization
), ai
->ai_addr
, ai
->ai_addrlen
);
217 memcpy_safe((char*) p
+ sizeof(AddrInfoSerialization
) + ai
->ai_addrlen
,
218 ai
->ai_canonname
, cnl
);
221 return (uint8_t*) p
+ l
;
224 static int send_addrinfo_reply(
232 AddrInfoResponse resp
= {};
234 AddrInfoSerialization ais
;
235 uint8_t space
[BUFSIZE
];
242 resp
= (AddrInfoResponse
) {
243 .header
.type
= RESPONSE_ADDRINFO
,
245 .header
.length
= sizeof(AddrInfoResponse
),
248 ._h_errno
= _h_errno
,
251 msan_unpoison(&resp
, sizeof(resp
));
253 if (ret
== 0 && ai
) {
257 for (k
= ai
; k
; k
= k
->ai_next
) {
258 p
= serialize_addrinfo(p
, k
, &resp
.header
.length
, (uint8_t*) &buffer
+ BUFSIZE
- (uint8_t*) p
);
269 iov
[0] = IOVEC_MAKE(&resp
, sizeof(AddrInfoResponse
));
270 iov
[1] = IOVEC_MAKE(&buffer
, resp
.header
.length
- sizeof(AddrInfoResponse
));
272 mh
= (struct msghdr
) {
274 .msg_iovlen
= ELEMENTSOF(iov
)
277 if (sendmsg(out_fd
, &mh
, MSG_NOSIGNAL
) < 0)
283 static int send_nameinfo_reply(
292 NameInfoResponse resp
= {};
299 sl
= serv
? strlen(serv
)+1 : 0;
300 hl
= host
? strlen(host
)+1 : 0;
302 resp
= (NameInfoResponse
) {
303 .header
.type
= RESPONSE_NAMEINFO
,
305 .header
.length
= sizeof(NameInfoResponse
) + hl
+ sl
,
310 ._h_errno
= _h_errno
,
313 msan_unpoison(&resp
, sizeof(resp
));
315 iov
[0] = IOVEC_MAKE(&resp
, sizeof(NameInfoResponse
));
316 iov
[1] = IOVEC_MAKE((void*) host
, hl
);
317 iov
[2] = IOVEC_MAKE((void*) serv
, sl
);
319 mh
= (struct msghdr
) {
321 .msg_iovlen
= ELEMENTSOF(iov
)
324 if (sendmsg(out_fd
, &mh
, MSG_NOSIGNAL
) < 0)
330 static int handle_request(int out_fd
, const Packet
*packet
, size_t length
) {
336 req
= &packet
->rheader
;
338 assert_return(length
>= sizeof(RHeader
), -EIO
);
339 assert_return(length
== req
->length
, -EIO
);
343 case REQUEST_ADDRINFO
: {
344 const AddrInfoRequest
*ai_req
= &packet
->addrinfo_request
;
345 struct addrinfo hints
, *result
= NULL
;
346 const char *node
, *service
;
349 assert_return(length
>= sizeof(AddrInfoRequest
), -EBADMSG
);
350 assert_return(length
== sizeof(AddrInfoRequest
) + ai_req
->node_len
+ ai_req
->service_len
, -EBADMSG
);
352 hints
= (struct addrinfo
) {
353 .ai_flags
= ai_req
->ai_flags
,
354 .ai_family
= ai_req
->ai_family
,
355 .ai_socktype
= ai_req
->ai_socktype
,
356 .ai_protocol
= ai_req
->ai_protocol
,
359 msan_unpoison(&hints
, sizeof(hints
));
361 node
= ai_req
->node_len
? (const char*) ai_req
+ sizeof(AddrInfoRequest
) : NULL
;
362 service
= ai_req
->service_len
? (const char*) ai_req
+ sizeof(AddrInfoRequest
) + ai_req
->node_len
: NULL
;
364 ret
= getaddrinfo(node
, service
,
365 ai_req
->hints_valid
? &hints
: NULL
,
368 /* send_addrinfo_reply() frees result */
369 return send_addrinfo_reply(out_fd
, req
->id
, ret
, result
, errno
, h_errno
);
372 case REQUEST_NAMEINFO
: {
373 const NameInfoRequest
*ni_req
= &packet
->nameinfo_request
;
374 char hostbuf
[NI_MAXHOST
], servbuf
[NI_MAXSERV
];
375 union sockaddr_union sa
;
378 assert_return(length
>= sizeof(NameInfoRequest
), -EBADMSG
);
379 assert_return(length
== sizeof(NameInfoRequest
) + ni_req
->sockaddr_len
, -EBADMSG
);
380 assert_return(ni_req
->sockaddr_len
<= sizeof(sa
), -EBADMSG
);
382 memcpy(&sa
, (const uint8_t *) ni_req
+ sizeof(NameInfoRequest
), ni_req
->sockaddr_len
);
384 ret
= getnameinfo(&sa
.sa
, ni_req
->sockaddr_len
,
385 ni_req
->gethost
? hostbuf
: NULL
, ni_req
->gethost
? sizeof(hostbuf
) : 0,
386 ni_req
->getserv
? servbuf
: NULL
, ni_req
->getserv
? sizeof(servbuf
) : 0,
389 return send_nameinfo_reply(out_fd
, req
->id
, ret
,
390 ret
== 0 && ni_req
->gethost
? hostbuf
: NULL
,
391 ret
== 0 && ni_req
->getserv
? servbuf
: NULL
,
395 case REQUEST_TERMINATE
:
400 assert_not_reached("Unknown request");
406 static void* thread_worker(void *p
) {
407 sd_resolve
*resolve
= p
;
409 /* Assign a pretty name to this thread */
410 (void) pthread_setname_np(pthread_self(), "sd-resolve");
412 while (!resolve
->dead
) {
415 uint8_t space
[BUFSIZE
];
419 length
= recv(resolve
->fds
[REQUEST_RECV_FD
], &buf
, sizeof buf
, 0);
429 if (handle_request(resolve
->fds
[RESPONSE_SEND_FD
], &buf
.packet
, (size_t) length
) < 0)
433 send_died(resolve
->fds
[RESPONSE_SEND_FD
]);
438 static int start_threads(sd_resolve
*resolve
, unsigned extra
) {
439 sigset_t ss
, saved_ss
;
443 assert_se(sigfillset(&ss
) >= 0);
445 /* No signals in forked off threads please. We set the mask before forking, so that the threads never exist
446 * with a different mask than a fully blocked one */
447 r
= pthread_sigmask(SIG_BLOCK
, &ss
, &saved_ss
);
451 n
= resolve
->n_outstanding
+ extra
;
452 n
= CLAMP(n
, WORKERS_MIN
, WORKERS_MAX
);
454 while (resolve
->n_valid_workers
< n
) {
455 r
= pthread_create(&resolve
->workers
[resolve
->n_valid_workers
], NULL
, thread_worker
, resolve
);
461 resolve
->n_valid_workers
++;
467 k
= pthread_sigmask(SIG_SETMASK
, &saved_ss
, NULL
);
474 static bool resolve_pid_changed(sd_resolve
*r
) {
477 /* We don't support people creating a resolver and keeping it
478 * around after fork(). Let's complain. */
480 return r
->original_pid
!= getpid_cached();
483 _public_
int sd_resolve_new(sd_resolve
**ret
) {
484 _cleanup_(sd_resolve_unrefp
) sd_resolve
*resolve
= NULL
;
487 assert_return(ret
, -EINVAL
);
489 resolve
= new0(sd_resolve
, 1);
494 resolve
->original_pid
= getpid_cached();
496 for (i
= 0; i
< _FD_MAX
; i
++)
497 resolve
->fds
[i
] = -1;
499 if (socketpair(AF_UNIX
, SOCK_DGRAM
|SOCK_CLOEXEC
, 0, resolve
->fds
+ REQUEST_RECV_FD
) < 0)
502 if (socketpair(AF_UNIX
, SOCK_DGRAM
|SOCK_CLOEXEC
, 0, resolve
->fds
+ RESPONSE_RECV_FD
) < 0)
505 for (i
= 0; i
< _FD_MAX
; i
++)
506 resolve
->fds
[i
] = fd_move_above_stdio(resolve
->fds
[i
]);
508 (void) fd_inc_sndbuf(resolve
->fds
[REQUEST_SEND_FD
], QUERIES_MAX
* BUFSIZE
);
509 (void) fd_inc_rcvbuf(resolve
->fds
[REQUEST_RECV_FD
], QUERIES_MAX
* BUFSIZE
);
510 (void) fd_inc_sndbuf(resolve
->fds
[RESPONSE_SEND_FD
], QUERIES_MAX
* BUFSIZE
);
511 (void) fd_inc_rcvbuf(resolve
->fds
[RESPONSE_RECV_FD
], QUERIES_MAX
* BUFSIZE
);
513 (void) fd_nonblock(resolve
->fds
[RESPONSE_RECV_FD
], true);
515 *ret
= TAKE_PTR(resolve
);
519 _public_
int sd_resolve_default(sd_resolve
**ret
) {
520 static thread_local sd_resolve
*default_resolve
= NULL
;
521 sd_resolve
*e
= NULL
;
525 return !!default_resolve
;
527 if (default_resolve
) {
528 *ret
= sd_resolve_ref(default_resolve
);
532 r
= sd_resolve_new(&e
);
536 e
->default_resolve_ptr
= &default_resolve
;
544 _public_
int sd_resolve_get_tid(sd_resolve
*resolve
, pid_t
*tid
) {
545 assert_return(resolve
, -EINVAL
);
546 assert_return(tid
, -EINVAL
);
547 assert_return(!resolve_pid_changed(resolve
), -ECHILD
);
549 if (resolve
->tid
!= 0) {
555 return sd_event_get_tid(resolve
->event
, tid
);
560 static sd_resolve
*resolve_free(sd_resolve
*resolve
) {
567 while ((q
= resolve
->queries
)) {
569 resolve_query_disconnect(q
);
570 sd_resolve_query_unref(q
);
573 if (resolve
->default_resolve_ptr
)
574 *(resolve
->default_resolve_ptr
) = NULL
;
576 resolve
->dead
= true;
578 sd_resolve_detach_event(resolve
);
580 if (resolve
->fds
[REQUEST_SEND_FD
] >= 0) {
583 .type
= REQUEST_TERMINATE
,
584 .length
= sizeof req
,
587 /* Send one termination packet for each worker */
588 for (i
= 0; i
< resolve
->n_valid_workers
; i
++)
589 (void) send(resolve
->fds
[REQUEST_SEND_FD
], &req
, req
.length
, MSG_NOSIGNAL
);
592 /* Now terminate them and wait until they are gone.
593 If we get an error than most likely the thread already exited. */
594 for (i
= 0; i
< resolve
->n_valid_workers
; i
++)
595 (void) pthread_join(resolve
->workers
[i
], NULL
);
597 /* Close all communication channels */
598 close_many(resolve
->fds
, _FD_MAX
);
600 return mfree(resolve
);
603 DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_resolve
, sd_resolve
, resolve_free
);
605 _public_
int sd_resolve_get_fd(sd_resolve
*resolve
) {
606 assert_return(resolve
, -EINVAL
);
607 assert_return(!resolve_pid_changed(resolve
), -ECHILD
);
609 return resolve
->fds
[RESPONSE_RECV_FD
];
612 _public_
int sd_resolve_get_events(sd_resolve
*resolve
) {
613 assert_return(resolve
, -EINVAL
);
614 assert_return(!resolve_pid_changed(resolve
), -ECHILD
);
616 return resolve
->n_queries
> resolve
->n_done
? POLLIN
: 0;
619 _public_
int sd_resolve_get_timeout(sd_resolve
*resolve
, uint64_t *usec
) {
620 assert_return(resolve
, -EINVAL
);
621 assert_return(usec
, -EINVAL
);
622 assert_return(!resolve_pid_changed(resolve
), -ECHILD
);
624 *usec
= (uint64_t) -1;
628 static sd_resolve_query
*lookup_query(sd_resolve
*resolve
, unsigned id
) {
633 q
= resolve
->query_array
[id
% QUERIES_MAX
];
641 static int complete_query(sd_resolve
*resolve
, sd_resolve_query
*q
) {
646 assert(q
->resolve
== resolve
);
651 resolve
->current
= sd_resolve_query_ref(q
);
655 case REQUEST_ADDRINFO
:
656 r
= getaddrinfo_done(q
);
659 case REQUEST_NAMEINFO
:
660 r
= getnameinfo_done(q
);
664 assert_not_reached("Cannot complete unknown query type");
667 resolve
->current
= NULL
;
670 resolve_query_disconnect(q
);
671 sd_resolve_query_unref(q
);
674 sd_resolve_query_unref(q
);
679 static int unserialize_addrinfo(const void **p
, size_t *length
, struct addrinfo
**ret_ai
) {
680 AddrInfoSerialization s
;
689 if (*length
< sizeof(AddrInfoSerialization
))
692 memcpy(&s
, *p
, sizeof(s
));
694 l
= sizeof(AddrInfoSerialization
) + s
.ai_addrlen
+ s
.canonname_len
;
698 ai
= new(struct addrinfo
, 1);
702 *ai
= (struct addrinfo
) {
703 .ai_flags
= s
.ai_flags
,
704 .ai_family
= s
.ai_family
,
705 .ai_socktype
= s
.ai_socktype
,
706 .ai_protocol
= s
.ai_protocol
,
707 .ai_addrlen
= s
.ai_addrlen
,
710 if (s
.ai_addrlen
> 0) {
711 ai
->ai_addr
= memdup((const uint8_t*) *p
+ sizeof(AddrInfoSerialization
), s
.ai_addrlen
);
718 if (s
.canonname_len
> 0) {
719 ai
->ai_canonname
= memdup((const uint8_t*) *p
+ sizeof(AddrInfoSerialization
) + s
.ai_addrlen
, s
.canonname_len
);
720 if (!ai
->ai_canonname
) {
729 *p
= ((const uint8_t*) *p
) + l
;
734 static int handle_response(sd_resolve
*resolve
, const Packet
*packet
, size_t length
) {
742 resp
= &packet
->rheader
;
743 assert_return(length
>= sizeof(RHeader
), -EIO
);
744 assert_return(length
== resp
->length
, -EIO
);
746 if (resp
->type
== RESPONSE_DIED
) {
747 resolve
->dead
= true;
751 assert(resolve
->n_outstanding
> 0);
752 resolve
->n_outstanding
--;
754 q
= lookup_query(resolve
, resp
->id
);
758 switch (resp
->type
) {
760 case RESPONSE_ADDRINFO
: {
761 const AddrInfoResponse
*ai_resp
= &packet
->addrinfo_response
;
764 struct addrinfo
*prev
= NULL
;
766 assert_return(length
>= sizeof(AddrInfoResponse
), -EBADMSG
);
767 assert_return(q
->type
== REQUEST_ADDRINFO
, -EBADMSG
);
769 query_assign_errno(q
, ai_resp
->ret
, ai_resp
->_errno
, ai_resp
->_h_errno
);
771 l
= length
- sizeof(AddrInfoResponse
);
772 p
= (const uint8_t*) resp
+ sizeof(AddrInfoResponse
);
775 struct addrinfo
*ai
= NULL
;
777 r
= unserialize_addrinfo(&p
, &l
, &ai
);
779 query_assign_errno(q
, EAI_SYSTEM
, r
, 0);
780 freeaddrinfo(q
->addrinfo
);
793 return complete_query(resolve
, q
);
796 case RESPONSE_NAMEINFO
: {
797 const NameInfoResponse
*ni_resp
= &packet
->nameinfo_response
;
799 assert_return(length
>= sizeof(NameInfoResponse
), -EBADMSG
);
800 assert_return(q
->type
== REQUEST_NAMEINFO
, -EBADMSG
);
802 if (ni_resp
->hostlen
> DNS_HOSTNAME_MAX
||
803 ni_resp
->servlen
> DNS_HOSTNAME_MAX
||
804 sizeof(NameInfoResponse
) + ni_resp
->hostlen
+ ni_resp
->servlen
> length
)
805 query_assign_errno(q
, EAI_SYSTEM
, EIO
, 0);
807 query_assign_errno(q
, ni_resp
->ret
, ni_resp
->_errno
, ni_resp
->_h_errno
);
809 if (ni_resp
->hostlen
> 0) {
810 q
->host
= strndup((const char*) ni_resp
+ sizeof(NameInfoResponse
),
813 query_assign_errno(q
, EAI_MEMORY
, ENOMEM
, 0);
816 if (ni_resp
->servlen
> 0) {
817 q
->serv
= strndup((const char*) ni_resp
+ sizeof(NameInfoResponse
) + ni_resp
->hostlen
,
820 query_assign_errno(q
, EAI_MEMORY
, ENOMEM
, 0);
824 return complete_query(resolve
, q
);
832 _public_
int sd_resolve_process(sd_resolve
*resolve
) {
833 RESOLVE_DONT_DESTROY(resolve
);
837 uint8_t space
[BUFSIZE
];
842 assert_return(resolve
, -EINVAL
);
843 assert_return(!resolve_pid_changed(resolve
), -ECHILD
);
845 /* We don't allow recursively invoking sd_resolve_process(). */
846 assert_return(!resolve
->current
, -EBUSY
);
848 l
= recv(resolve
->fds
[RESPONSE_RECV_FD
], &buf
, sizeof buf
, 0);
856 return -ECONNREFUSED
;
858 r
= handle_response(resolve
, &buf
.packet
, (size_t) l
);
865 _public_
int sd_resolve_wait(sd_resolve
*resolve
, uint64_t timeout_usec
) {
868 assert_return(resolve
, -EINVAL
);
869 assert_return(!resolve_pid_changed(resolve
), -ECHILD
);
871 if (resolve
->n_done
>= resolve
->n_queries
)
875 r
= fd_wait_for_event(resolve
->fds
[RESPONSE_RECV_FD
], POLLIN
, timeout_usec
);
876 } while (r
== -EINTR
);
883 return sd_resolve_process(resolve
);
886 static int alloc_query(sd_resolve
*resolve
, bool floating
, sd_resolve_query
**_q
) {
893 if (resolve
->n_queries
>= QUERIES_MAX
)
896 r
= start_threads(resolve
, 1);
900 while (resolve
->query_array
[resolve
->current_id
% QUERIES_MAX
])
901 resolve
->current_id
++;
903 q
= resolve
->query_array
[resolve
->current_id
% QUERIES_MAX
] = new0(sd_resolve_query
, 1);
908 q
->resolve
= resolve
;
909 q
->floating
= floating
;
910 q
->id
= resolve
->current_id
++;
913 sd_resolve_ref(resolve
);
915 LIST_PREPEND(queries
, resolve
->queries
, q
);
916 resolve
->n_queries
++;
922 int resolve_getaddrinfo_with_destroy_callback(
924 sd_resolve_query
**ret_query
,
925 const char *node
, const char *service
,
926 const struct addrinfo
*hints
,
927 sd_resolve_getaddrinfo_handler_t callback
,
928 sd_resolve_destroy_t destroy_callback
,
931 _cleanup_(sd_resolve_query_unrefp
) sd_resolve_query
*q
= NULL
;
932 size_t node_len
, service_len
;
933 AddrInfoRequest req
= {};
935 struct msghdr mh
= {};
938 assert_return(resolve
, -EINVAL
);
939 assert_return(node
|| service
, -EINVAL
);
940 assert_return(callback
, -EINVAL
);
941 assert_return(!resolve_pid_changed(resolve
), -ECHILD
);
943 r
= alloc_query(resolve
, !ret_query
, &q
);
947 q
->type
= REQUEST_ADDRINFO
;
948 q
->getaddrinfo_handler
= callback
;
949 q
->userdata
= userdata
;
951 node_len
= node
? strlen(node
) + 1 : 0;
952 service_len
= service
? strlen(service
) + 1 : 0;
954 req
= (AddrInfoRequest
) {
955 .node_len
= node_len
,
956 .service_len
= service_len
,
959 .header
.type
= REQUEST_ADDRINFO
,
960 .header
.length
= sizeof(AddrInfoRequest
) + node_len
+ service_len
,
962 .hints_valid
= hints
,
963 .ai_flags
= hints
? hints
->ai_flags
: 0,
964 .ai_family
= hints
? hints
->ai_family
: 0,
965 .ai_socktype
= hints
? hints
->ai_socktype
: 0,
966 .ai_protocol
= hints
? hints
->ai_protocol
: 0,
969 msan_unpoison(&req
, sizeof(req
));
971 iov
[mh
.msg_iovlen
++] = IOVEC_MAKE(&req
, sizeof(AddrInfoRequest
));
973 iov
[mh
.msg_iovlen
++] = IOVEC_MAKE((void*) node
, req
.node_len
);
975 iov
[mh
.msg_iovlen
++] = IOVEC_MAKE((void*) service
, req
.service_len
);
978 if (sendmsg(resolve
->fds
[REQUEST_SEND_FD
], &mh
, MSG_NOSIGNAL
) < 0)
981 resolve
->n_outstanding
++;
982 q
->destroy_callback
= destroy_callback
;
992 _public_
int sd_resolve_getaddrinfo(
994 sd_resolve_query
**ret_query
,
995 const char *node
, const char *service
,
996 const struct addrinfo
*hints
,
997 sd_resolve_getaddrinfo_handler_t callback
,
1000 return resolve_getaddrinfo_with_destroy_callback(resolve
, ret_query
, node
, service
, hints
, callback
, NULL
, userdata
);
1003 static int getaddrinfo_done(sd_resolve_query
* q
) {
1006 assert(q
->getaddrinfo_handler
);
1009 h_errno
= q
->_h_errno
;
1011 return q
->getaddrinfo_handler(q
, q
->ret
, q
->addrinfo
, q
->userdata
);
1014 int resolve_getnameinfo_with_destroy_callback(
1015 sd_resolve
*resolve
,
1016 sd_resolve_query
**ret_query
,
1017 const struct sockaddr
*sa
, socklen_t salen
,
1020 sd_resolve_getnameinfo_handler_t callback
,
1021 sd_resolve_destroy_t destroy_callback
,
1024 _cleanup_(sd_resolve_query_unrefp
) sd_resolve_query
*q
= NULL
;
1025 NameInfoRequest req
= {};
1026 struct iovec iov
[2];
1030 assert_return(resolve
, -EINVAL
);
1031 assert_return(sa
, -EINVAL
);
1032 assert_return(salen
>= sizeof(struct sockaddr
), -EINVAL
);
1033 assert_return(salen
<= sizeof(union sockaddr_union
), -EINVAL
);
1034 assert_return((get
& ~SD_RESOLVE_GET_BOTH
) == 0, -EINVAL
);
1035 assert_return(callback
, -EINVAL
);
1036 assert_return(!resolve_pid_changed(resolve
), -ECHILD
);
1038 r
= alloc_query(resolve
, !ret_query
, &q
);
1042 q
->type
= REQUEST_NAMEINFO
;
1043 q
->getnameinfo_handler
= callback
;
1044 q
->userdata
= userdata
;
1046 req
= (NameInfoRequest
) {
1048 .header
.type
= REQUEST_NAMEINFO
,
1049 .header
.length
= sizeof(NameInfoRequest
) + salen
,
1052 .sockaddr_len
= salen
,
1053 .gethost
= !!(get
& SD_RESOLVE_GET_HOST
),
1054 .getserv
= !!(get
& SD_RESOLVE_GET_SERVICE
),
1057 msan_unpoison(&req
, sizeof(req
));
1059 iov
[0] = IOVEC_MAKE(&req
, sizeof(NameInfoRequest
));
1060 iov
[1] = IOVEC_MAKE((void*) sa
, salen
);
1062 mh
= (struct msghdr
) {
1064 .msg_iovlen
= ELEMENTSOF(iov
)
1067 if (sendmsg(resolve
->fds
[REQUEST_SEND_FD
], &mh
, MSG_NOSIGNAL
) < 0)
1070 resolve
->n_outstanding
++;
1071 q
->destroy_callback
= destroy_callback
;
1081 _public_
int sd_resolve_getnameinfo(
1082 sd_resolve
*resolve
,
1083 sd_resolve_query
**ret_query
,
1084 const struct sockaddr
*sa
, socklen_t salen
,
1087 sd_resolve_getnameinfo_handler_t callback
,
1090 return resolve_getnameinfo_with_destroy_callback(resolve
, ret_query
, sa
, salen
, flags
, get
, callback
, NULL
, userdata
);
1093 static int getnameinfo_done(sd_resolve_query
*q
) {
1097 assert(q
->getnameinfo_handler
);
1100 h_errno
= q
->_h_errno
;
1102 return q
->getnameinfo_handler(q
, q
->ret
, q
->host
, q
->serv
, q
->userdata
);
1105 static void resolve_freeaddrinfo(struct addrinfo
*ai
) {
1107 struct addrinfo
*next
= ai
->ai_next
;
1110 free(ai
->ai_canonname
);
1116 static void resolve_query_disconnect(sd_resolve_query
*q
) {
1117 sd_resolve
*resolve
;
1125 resolve
= q
->resolve
;
1126 assert(resolve
->n_queries
> 0);
1129 assert(resolve
->n_done
> 0);
1133 i
= q
->id
% QUERIES_MAX
;
1134 assert(resolve
->query_array
[i
] == q
);
1135 resolve
->query_array
[i
] = NULL
;
1136 LIST_REMOVE(queries
, resolve
->queries
, q
);
1137 resolve
->n_queries
--;
1141 sd_resolve_unref(resolve
);
1144 static sd_resolve_query
*resolve_query_free(sd_resolve_query
*q
) {
1147 resolve_query_disconnect(q
);
1149 if (q
->destroy_callback
)
1150 q
->destroy_callback(q
->userdata
);
1152 resolve_freeaddrinfo(q
->addrinfo
);
1159 DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_resolve_query
, sd_resolve_query
, resolve_query_free
);
1161 _public_
int sd_resolve_query_is_done(sd_resolve_query
*q
) {
1162 assert_return(q
, -EINVAL
);
1163 assert_return(!resolve_pid_changed(q
->resolve
), -ECHILD
);
1168 _public_
void* sd_resolve_query_set_userdata(sd_resolve_query
*q
, void *userdata
) {
1171 assert_return(q
, NULL
);
1172 assert_return(!resolve_pid_changed(q
->resolve
), NULL
);
1175 q
->userdata
= userdata
;
1180 _public_
void* sd_resolve_query_get_userdata(sd_resolve_query
*q
) {
1181 assert_return(q
, NULL
);
1182 assert_return(!resolve_pid_changed(q
->resolve
), NULL
);
1187 _public_ sd_resolve
*sd_resolve_query_get_resolve(sd_resolve_query
*q
) {
1188 assert_return(q
, NULL
);
1189 assert_return(!resolve_pid_changed(q
->resolve
), NULL
);
1194 _public_
int sd_resolve_query_get_destroy_callback(sd_resolve_query
*q
, sd_resolve_destroy_t
*destroy_callback
) {
1195 assert_return(q
, -EINVAL
);
1197 if (destroy_callback
)
1198 *destroy_callback
= q
->destroy_callback
;
1200 return !!q
->destroy_callback
;
1203 _public_
int sd_resolve_query_set_destroy_callback(sd_resolve_query
*q
, sd_resolve_destroy_t destroy_callback
) {
1204 assert_return(q
, -EINVAL
);
1206 q
->destroy_callback
= destroy_callback
;
1210 _public_
int sd_resolve_query_get_floating(sd_resolve_query
*q
) {
1211 assert_return(q
, -EINVAL
);
1216 _public_
int sd_resolve_query_set_floating(sd_resolve_query
*q
, int b
) {
1217 assert_return(q
, -EINVAL
);
1219 if (q
->floating
== !!b
)
1222 if (!q
->resolve
) /* Already disconnected */
1228 sd_resolve_query_ref(q
);
1229 sd_resolve_unref(q
->resolve
);
1231 sd_resolve_ref(q
->resolve
);
1232 sd_resolve_query_unref(q
);
1238 static int io_callback(sd_event_source
*s
, int fd
, uint32_t revents
, void *userdata
) {
1239 sd_resolve
*resolve
= userdata
;
1244 r
= sd_resolve_process(resolve
);
1251 _public_
int sd_resolve_attach_event(sd_resolve
*resolve
, sd_event
*event
, int64_t priority
) {
1254 assert_return(resolve
, -EINVAL
);
1255 assert_return(!resolve
->event
, -EBUSY
);
1257 assert(!resolve
->event_source
);
1260 resolve
->event
= sd_event_ref(event
);
1262 r
= sd_event_default(&resolve
->event
);
1267 r
= sd_event_add_io(resolve
->event
, &resolve
->event_source
, resolve
->fds
[RESPONSE_RECV_FD
], POLLIN
, io_callback
, resolve
);
1271 r
= sd_event_source_set_priority(resolve
->event_source
, priority
);
1278 sd_resolve_detach_event(resolve
);
1282 _public_
int sd_resolve_detach_event(sd_resolve
*resolve
) {
1283 assert_return(resolve
, -EINVAL
);
1285 if (!resolve
->event
)
1288 if (resolve
->event_source
) {
1289 sd_event_source_set_enabled(resolve
->event_source
, SD_EVENT_OFF
);
1290 resolve
->event_source
= sd_event_source_unref(resolve
->event_source
);
1293 resolve
->event
= sd_event_unref(resolve
->event
);
1297 _public_ sd_event
*sd_resolve_get_event(sd_resolve
*resolve
) {
1298 assert_return(resolve
, NULL
);
1300 return resolve
->event
;