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24#include "config-host.h"
25
26#include "net/net.h"
27#include "clients.h"
28#include "monitor/monitor.h"
29#include "qemu-common.h"
30#include "qemu/error-report.h"
31#include "qemu/option.h"
32#include "qemu/sockets.h"
33#include "qemu/iov.h"
34#include "qemu/main-loop.h"
35
36typedef struct NetSocketState {
37 NetClientState nc;
38 int listen_fd;
39 int fd;
40 int state;
41 unsigned int index;
42 unsigned int packet_len;
43 unsigned int send_index;
44 uint8_t buf[NET_BUFSIZE];
45 struct sockaddr_in dgram_dst;
46 IOHandler *send_fn;
47 bool read_poll;
48 bool write_poll;
49} NetSocketState;
50
51static void net_socket_accept(void *opaque);
52static void net_socket_writable(void *opaque);
53
54static void net_socket_update_fd_handler(NetSocketState *s)
55{
56 qemu_set_fd_handler(s->fd,
57 s->read_poll ? s->send_fn : NULL,
58 s->write_poll ? net_socket_writable : NULL,
59 s);
60}
61
62static void net_socket_read_poll(NetSocketState *s, bool enable)
63{
64 s->read_poll = enable;
65 net_socket_update_fd_handler(s);
66}
67
68static void net_socket_write_poll(NetSocketState *s, bool enable)
69{
70 s->write_poll = enable;
71 net_socket_update_fd_handler(s);
72}
73
74static void net_socket_writable(void *opaque)
75{
76 NetSocketState *s = opaque;
77
78 net_socket_write_poll(s, false);
79
80 qemu_flush_queued_packets(&s->nc);
81}
82
83static ssize_t net_socket_receive(NetClientState *nc, const uint8_t *buf, size_t size)
84{
85 NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
86 uint32_t len = htonl(size);
87 struct iovec iov[] = {
88 {
89 .iov_base = &len,
90 .iov_len = sizeof(len),
91 }, {
92 .iov_base = (void *)buf,
93 .iov_len = size,
94 },
95 };
96 size_t remaining;
97 ssize_t ret;
98
99 remaining = iov_size(iov, 2) - s->send_index;
100 ret = iov_send(s->fd, iov, 2, s->send_index, remaining);
101
102 if (ret == -1 && errno == EAGAIN) {
103 ret = 0;
104 }
105 if (ret == -1) {
106 s->send_index = 0;
107 return -errno;
108 }
109 if (ret < (ssize_t)remaining) {
110 s->send_index += ret;
111 net_socket_write_poll(s, true);
112 return 0;
113 }
114 s->send_index = 0;
115 return size;
116}
117
118static ssize_t net_socket_receive_dgram(NetClientState *nc, const uint8_t *buf, size_t size)
119{
120 NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
121 ssize_t ret;
122
123 do {
124 ret = qemu_sendto(s->fd, buf, size, 0,
125 (struct sockaddr *)&s->dgram_dst,
126 sizeof(s->dgram_dst));
127 } while (ret == -1 && errno == EINTR);
128
129 if (ret == -1 && errno == EAGAIN) {
130 net_socket_write_poll(s, true);
131 return 0;
132 }
133 return ret;
134}
135
136static void net_socket_send_completed(NetClientState *nc, ssize_t len)
137{
138 NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
139
140 if (!s->read_poll) {
141 net_socket_read_poll(s, true);
142 }
143}
144
145static void net_socket_send(void *opaque)
146{
147 NetSocketState *s = opaque;
148 int size, err;
149 unsigned l;
150 uint8_t buf1[NET_BUFSIZE];
151 const uint8_t *buf;
152
153 size = qemu_recv(s->fd, buf1, sizeof(buf1), 0);
154 if (size < 0) {
155 err = socket_error();
156 if (err != EWOULDBLOCK)
157 goto eoc;
158 } else if (size == 0) {
159
160 eoc:
161 net_socket_read_poll(s, false);
162 net_socket_write_poll(s, false);
163 if (s->listen_fd != -1) {
164 qemu_set_fd_handler(s->listen_fd, net_socket_accept, NULL, s);
165 }
166 closesocket(s->fd);
167
168 s->fd = -1;
169 s->state = 0;
170 s->index = 0;
171 s->packet_len = 0;
172 s->nc.link_down = true;
173 memset(s->buf, 0, sizeof(s->buf));
174 memset(s->nc.info_str, 0, sizeof(s->nc.info_str));
175
176 return;
177 }
178 buf = buf1;
179 while (size > 0) {
180
181 switch(s->state) {
182 case 0:
183 l = 4 - s->index;
184 if (l > size)
185 l = size;
186 memcpy(s->buf + s->index, buf, l);
187 buf += l;
188 size -= l;
189 s->index += l;
190 if (s->index == 4) {
191
192 s->packet_len = ntohl(*(uint32_t *)s->buf);
193 s->index = 0;
194 s->state = 1;
195 }
196 break;
197 case 1:
198 l = s->packet_len - s->index;
199 if (l > size)
200 l = size;
201 if (s->index + l <= sizeof(s->buf)) {
202 memcpy(s->buf + s->index, buf, l);
203 } else {
204 fprintf(stderr, "serious error: oversized packet received,"
205 "connection terminated.\n");
206 s->state = 0;
207 goto eoc;
208 }
209
210 s->index += l;
211 buf += l;
212 size -= l;
213 if (s->index >= s->packet_len) {
214 s->index = 0;
215 s->state = 0;
216 if (qemu_send_packet_async(&s->nc, s->buf, s->packet_len,
217 net_socket_send_completed) == 0) {
218 net_socket_read_poll(s, false);
219 break;
220 }
221 }
222 break;
223 }
224 }
225}
226
227static void net_socket_send_dgram(void *opaque)
228{
229 NetSocketState *s = opaque;
230 int size;
231
232 size = qemu_recv(s->fd, s->buf, sizeof(s->buf), 0);
233 if (size < 0)
234 return;
235 if (size == 0) {
236
237 net_socket_read_poll(s, false);
238 net_socket_write_poll(s, false);
239 return;
240 }
241 if (qemu_send_packet_async(&s->nc, s->buf, size,
242 net_socket_send_completed) == 0) {
243 net_socket_read_poll(s, false);
244 }
245}
246
247static int net_socket_mcast_create(struct sockaddr_in *mcastaddr, struct in_addr *localaddr)
248{
249 struct ip_mreq imr;
250 int fd;
251 int val, ret;
252#ifdef __OpenBSD__
253 unsigned char loop;
254#else
255 int loop;
256#endif
257
258 if (!IN_MULTICAST(ntohl(mcastaddr->sin_addr.s_addr))) {
259 fprintf(stderr, "qemu: error: specified mcastaddr \"%s\" (0x%08x) "
260 "does not contain a multicast address\n",
261 inet_ntoa(mcastaddr->sin_addr),
262 (int)ntohl(mcastaddr->sin_addr.s_addr));
263 return -1;
264
265 }
266 fd = qemu_socket(PF_INET, SOCK_DGRAM, 0);
267 if (fd < 0) {
268 perror("socket(PF_INET, SOCK_DGRAM)");
269 return -1;
270 }
271
272
273
274
275
276
277 val = 1;
278 ret = qemu_setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
279 if (ret < 0) {
280 perror("setsockopt(SOL_SOCKET, SO_REUSEADDR)");
281 goto fail;
282 }
283
284 ret = bind(fd, (struct sockaddr *)mcastaddr, sizeof(*mcastaddr));
285 if (ret < 0) {
286 perror("bind");
287 goto fail;
288 }
289
290
291 imr.imr_multiaddr = mcastaddr->sin_addr;
292 if (localaddr) {
293 imr.imr_interface = *localaddr;
294 } else {
295 imr.imr_interface.s_addr = htonl(INADDR_ANY);
296 }
297
298 ret = qemu_setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
299 &imr, sizeof(struct ip_mreq));
300 if (ret < 0) {
301 perror("setsockopt(IP_ADD_MEMBERSHIP)");
302 goto fail;
303 }
304
305
306 loop = 1;
307 ret = qemu_setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP,
308 &loop, sizeof(loop));
309 if (ret < 0) {
310 perror("setsockopt(SOL_IP, IP_MULTICAST_LOOP)");
311 goto fail;
312 }
313
314
315 if (localaddr != NULL) {
316 ret = qemu_setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF,
317 localaddr, sizeof(*localaddr));
318 if (ret < 0) {
319 perror("setsockopt(IP_MULTICAST_IF)");
320 goto fail;
321 }
322 }
323
324 qemu_set_nonblock(fd);
325 return fd;
326fail:
327 if (fd >= 0)
328 closesocket(fd);
329 return -1;
330}
331
332static void net_socket_cleanup(NetClientState *nc)
333{
334 NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
335 if (s->fd != -1) {
336 net_socket_read_poll(s, false);
337 net_socket_write_poll(s, false);
338 close(s->fd);
339 s->fd = -1;
340 }
341 if (s->listen_fd != -1) {
342 qemu_set_fd_handler(s->listen_fd, NULL, NULL, NULL);
343 closesocket(s->listen_fd);
344 s->listen_fd = -1;
345 }
346}
347
348static NetClientInfo net_dgram_socket_info = {
349 .type = NET_CLIENT_OPTIONS_KIND_SOCKET,
350 .size = sizeof(NetSocketState),
351 .receive = net_socket_receive_dgram,
352 .cleanup = net_socket_cleanup,
353};
354
355static NetSocketState *net_socket_fd_init_dgram(NetClientState *peer,
356 const char *model,
357 const char *name,
358 int fd, int is_connected)
359{
360 struct sockaddr_in saddr;
361 int newfd;
362 socklen_t saddr_len = sizeof(saddr);
363 NetClientState *nc;
364 NetSocketState *s;
365
366
367
368
369
370
371 if (is_connected) {
372 if (getsockname(fd, (struct sockaddr *) &saddr, &saddr_len) == 0) {
373
374 if (saddr.sin_addr.s_addr == 0) {
375 fprintf(stderr, "qemu: error: init_dgram: fd=%d unbound, "
376 "cannot setup multicast dst addr\n", fd);
377 goto err;
378 }
379
380 newfd = net_socket_mcast_create(&saddr, NULL);
381 if (newfd < 0) {
382
383 goto err;
384 }
385
386 dup2(newfd, fd);
387 close(newfd);
388
389 } else {
390 fprintf(stderr,
391 "qemu: error: init_dgram: fd=%d failed getsockname(): %s\n",
392 fd, strerror(errno));
393 goto err;
394 }
395 }
396
397 nc = qemu_new_net_client(&net_dgram_socket_info, peer, model, name);
398
399 s = DO_UPCAST(NetSocketState, nc, nc);
400
401 s->fd = fd;
402 s->listen_fd = -1;
403 s->send_fn = net_socket_send_dgram;
404 net_socket_read_poll(s, true);
405
406
407 if (is_connected) {
408 s->dgram_dst = saddr;
409 snprintf(nc->info_str, sizeof(nc->info_str),
410 "socket: fd=%d (cloned mcast=%s:%d)",
411 fd, inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
412 } else {
413 snprintf(nc->info_str, sizeof(nc->info_str),
414 "socket: fd=%d", fd);
415 }
416
417 return s;
418
419err:
420 closesocket(fd);
421 return NULL;
422}
423
424static void net_socket_connect(void *opaque)
425{
426 NetSocketState *s = opaque;
427 s->send_fn = net_socket_send;
428 net_socket_read_poll(s, true);
429}
430
431static NetClientInfo net_socket_info = {
432 .type = NET_CLIENT_OPTIONS_KIND_SOCKET,
433 .size = sizeof(NetSocketState),
434 .receive = net_socket_receive,
435 .cleanup = net_socket_cleanup,
436};
437
438static NetSocketState *net_socket_fd_init_stream(NetClientState *peer,
439 const char *model,
440 const char *name,
441 int fd, int is_connected)
442{
443 NetClientState *nc;
444 NetSocketState *s;
445
446 nc = qemu_new_net_client(&net_socket_info, peer, model, name);
447
448 snprintf(nc->info_str, sizeof(nc->info_str), "socket: fd=%d", fd);
449
450 s = DO_UPCAST(NetSocketState, nc, nc);
451
452 s->fd = fd;
453 s->listen_fd = -1;
454
455
456 socket_set_nodelay(fd);
457
458 if (is_connected) {
459 net_socket_connect(s);
460 } else {
461 qemu_set_fd_handler(s->fd, NULL, net_socket_connect, s);
462 }
463 return s;
464}
465
466static NetSocketState *net_socket_fd_init(NetClientState *peer,
467 const char *model, const char *name,
468 int fd, int is_connected)
469{
470 int so_type = -1, optlen=sizeof(so_type);
471
472 if(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&so_type,
473 (socklen_t *)&optlen)< 0) {
474 fprintf(stderr, "qemu: error: getsockopt(SO_TYPE) for fd=%d failed\n",
475 fd);
476 closesocket(fd);
477 return NULL;
478 }
479 switch(so_type) {
480 case SOCK_DGRAM:
481 return net_socket_fd_init_dgram(peer, model, name, fd, is_connected);
482 case SOCK_STREAM:
483 return net_socket_fd_init_stream(peer, model, name, fd, is_connected);
484 default:
485
486 fprintf(stderr, "qemu: warning: socket type=%d for fd=%d is not SOCK_DGRAM or SOCK_STREAM\n", so_type, fd);
487 return net_socket_fd_init_stream(peer, model, name, fd, is_connected);
488 }
489 return NULL;
490}
491
492static void net_socket_accept(void *opaque)
493{
494 NetSocketState *s = opaque;
495 struct sockaddr_in saddr;
496 socklen_t len;
497 int fd;
498
499 for(;;) {
500 len = sizeof(saddr);
501 fd = qemu_accept(s->listen_fd, (struct sockaddr *)&saddr, &len);
502 if (fd < 0 && errno != EINTR) {
503 return;
504 } else if (fd >= 0) {
505 qemu_set_fd_handler(s->listen_fd, NULL, NULL, NULL);
506 break;
507 }
508 }
509
510 s->fd = fd;
511 s->nc.link_down = false;
512 net_socket_connect(s);
513 snprintf(s->nc.info_str, sizeof(s->nc.info_str),
514 "socket: connection from %s:%d",
515 inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
516}
517
518static int net_socket_listen_init(NetClientState *peer,
519 const char *model,
520 const char *name,
521 const char *host_str)
522{
523 NetClientState *nc;
524 NetSocketState *s;
525 struct sockaddr_in saddr;
526 int fd, ret;
527
528 if (parse_host_port(&saddr, host_str) < 0)
529 return -1;
530
531 fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
532 if (fd < 0) {
533 perror("socket");
534 return -1;
535 }
536 qemu_set_nonblock(fd);
537
538 socket_set_fast_reuse(fd);
539
540 ret = bind(fd, (struct sockaddr *)&saddr, sizeof(saddr));
541 if (ret < 0) {
542 perror("bind");
543 closesocket(fd);
544 return -1;
545 }
546 ret = listen(fd, 0);
547 if (ret < 0) {
548 perror("listen");
549 closesocket(fd);
550 return -1;
551 }
552
553 nc = qemu_new_net_client(&net_socket_info, peer, model, name);
554 s = DO_UPCAST(NetSocketState, nc, nc);
555 s->fd = -1;
556 s->listen_fd = fd;
557 s->nc.link_down = true;
558
559 qemu_set_fd_handler(s->listen_fd, net_socket_accept, NULL, s);
560 return 0;
561}
562
563static int net_socket_connect_init(NetClientState *peer,
564 const char *model,
565 const char *name,
566 const char *host_str)
567{
568 NetSocketState *s;
569 int fd, connected, ret, err;
570 struct sockaddr_in saddr;
571
572 if (parse_host_port(&saddr, host_str) < 0)
573 return -1;
574
575 fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
576 if (fd < 0) {
577 perror("socket");
578 return -1;
579 }
580 qemu_set_nonblock(fd);
581
582 connected = 0;
583 for(;;) {
584 ret = connect(fd, (struct sockaddr *)&saddr, sizeof(saddr));
585 if (ret < 0) {
586 err = socket_error();
587 if (err == EINTR || err == EWOULDBLOCK) {
588 } else if (err == EINPROGRESS) {
589 break;
590#ifdef _WIN32
591 } else if (err == WSAEALREADY || err == WSAEINVAL) {
592 break;
593#endif
594 } else {
595 perror("connect");
596 closesocket(fd);
597 return -1;
598 }
599 } else {
600 connected = 1;
601 break;
602 }
603 }
604 s = net_socket_fd_init(peer, model, name, fd, connected);
605 if (!s)
606 return -1;
607 snprintf(s->nc.info_str, sizeof(s->nc.info_str),
608 "socket: connect to %s:%d",
609 inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
610 return 0;
611}
612
613static int net_socket_mcast_init(NetClientState *peer,
614 const char *model,
615 const char *name,
616 const char *host_str,
617 const char *localaddr_str)
618{
619 NetSocketState *s;
620 int fd;
621 struct sockaddr_in saddr;
622 struct in_addr localaddr, *param_localaddr;
623
624 if (parse_host_port(&saddr, host_str) < 0)
625 return -1;
626
627 if (localaddr_str != NULL) {
628 if (inet_aton(localaddr_str, &localaddr) == 0)
629 return -1;
630 param_localaddr = &localaddr;
631 } else {
632 param_localaddr = NULL;
633 }
634
635 fd = net_socket_mcast_create(&saddr, param_localaddr);
636 if (fd < 0)
637 return -1;
638
639 s = net_socket_fd_init(peer, model, name, fd, 0);
640 if (!s)
641 return -1;
642
643 s->dgram_dst = saddr;
644
645 snprintf(s->nc.info_str, sizeof(s->nc.info_str),
646 "socket: mcast=%s:%d",
647 inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
648 return 0;
649
650}
651
652static int net_socket_udp_init(NetClientState *peer,
653 const char *model,
654 const char *name,
655 const char *rhost,
656 const char *lhost)
657{
658 NetSocketState *s;
659 int fd, ret;
660 struct sockaddr_in laddr, raddr;
661
662 if (parse_host_port(&laddr, lhost) < 0) {
663 return -1;
664 }
665
666 if (parse_host_port(&raddr, rhost) < 0) {
667 return -1;
668 }
669
670 fd = qemu_socket(PF_INET, SOCK_DGRAM, 0);
671 if (fd < 0) {
672 perror("socket(PF_INET, SOCK_DGRAM)");
673 return -1;
674 }
675
676 ret = socket_set_fast_reuse(fd);
677 if (ret < 0) {
678 closesocket(fd);
679 return -1;
680 }
681 ret = bind(fd, (struct sockaddr *)&laddr, sizeof(laddr));
682 if (ret < 0) {
683 perror("bind");
684 closesocket(fd);
685 return -1;
686 }
687 qemu_set_nonblock(fd);
688
689 s = net_socket_fd_init(peer, model, name, fd, 0);
690 if (!s) {
691 return -1;
692 }
693
694 s->dgram_dst = raddr;
695
696 snprintf(s->nc.info_str, sizeof(s->nc.info_str),
697 "socket: udp=%s:%d",
698 inet_ntoa(raddr.sin_addr), ntohs(raddr.sin_port));
699 return 0;
700}
701
702int net_init_socket(const NetClientOptions *opts, const char *name,
703 NetClientState *peer, Error **errp)
704{
705
706 Error *err = NULL;
707 const NetdevSocketOptions *sock;
708
709 assert(opts->type == NET_CLIENT_OPTIONS_KIND_SOCKET);
710 sock = opts->u.socket;
711
712 if (sock->has_fd + sock->has_listen + sock->has_connect + sock->has_mcast +
713 sock->has_udp != 1) {
714 error_report("exactly one of fd=, listen=, connect=, mcast= or udp="
715 " is required");
716 return -1;
717 }
718
719 if (sock->has_localaddr && !sock->has_mcast && !sock->has_udp) {
720 error_report("localaddr= is only valid with mcast= or udp=");
721 return -1;
722 }
723
724 if (sock->has_fd) {
725 int fd;
726
727 fd = monitor_fd_param(cur_mon, sock->fd, &err);
728 if (fd == -1) {
729 error_report_err(err);
730 return -1;
731 }
732 qemu_set_nonblock(fd);
733 if (!net_socket_fd_init(peer, "socket", name, fd, 1)) {
734 return -1;
735 }
736 return 0;
737 }
738
739 if (sock->has_listen) {
740 if (net_socket_listen_init(peer, "socket", name, sock->listen) == -1) {
741 return -1;
742 }
743 return 0;
744 }
745
746 if (sock->has_connect) {
747 if (net_socket_connect_init(peer, "socket", name, sock->connect) ==
748 -1) {
749 return -1;
750 }
751 return 0;
752 }
753
754 if (sock->has_mcast) {
755
756
757 if (net_socket_mcast_init(peer, "socket", name, sock->mcast,
758 sock->localaddr) == -1) {
759 return -1;
760 }
761 return 0;
762 }
763
764 assert(sock->has_udp);
765 if (!sock->has_localaddr) {
766 error_report("localaddr= is mandatory with udp=");
767 return -1;
768 }
769 if (net_socket_udp_init(peer, "socket", name, sock->udp, sock->localaddr) ==
770 -1) {
771 return -1;
772 }
773 return 0;
774}
775