aboutsummaryrefslogtreecommitdiff
path: root/util/qemu-sockets.c
blob: b6b78f503a4ff4ae14fd470dc9b47906c7d73942 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
/*
 *  inet and unix socket functions for qemu
 *
 *  (c) 2008 Gerd Hoffmann <kraxel@redhat.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; under version 2 of the License.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 * Contributions after 2012-01-13 are licensed under the terms of the
 * GNU GPL, version 2 or (at your option) any later version.
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <unistd.h>

#include "monitor/monitor.h"
#include "qemu/sockets.h"
#include "qemu-common.h" /* for qemu_isdigit */
#include "qemu/main-loop.h"

#ifndef AI_ADDRCONFIG
# define AI_ADDRCONFIG 0
#endif

static const int on=1, off=0;

/* used temporarily until all users are converted to QemuOpts */
QemuOptsList socket_optslist = {
    .name = "socket",
    .head = QTAILQ_HEAD_INITIALIZER(socket_optslist.head),
    .desc = {
        {
            .name = "path",
            .type = QEMU_OPT_STRING,
        },{
            .name = "host",
            .type = QEMU_OPT_STRING,
        },{
            .name = "port",
            .type = QEMU_OPT_STRING,
        },{
            .name = "to",
            .type = QEMU_OPT_NUMBER,
        },{
            .name = "ipv4",
            .type = QEMU_OPT_BOOL,
        },{
            .name = "ipv6",
            .type = QEMU_OPT_BOOL,
        },
        { /* end if list */ }
    },
};

static int inet_getport(struct addrinfo *e)
{
    struct sockaddr_in *i4;
    struct sockaddr_in6 *i6;

    switch (e->ai_family) {
    case PF_INET6:
        i6 = (void*)e->ai_addr;
        return ntohs(i6->sin6_port);
    case PF_INET:
        i4 = (void*)e->ai_addr;
        return ntohs(i4->sin_port);
    default:
        return 0;
    }
}

static void inet_setport(struct addrinfo *e, int port)
{
    struct sockaddr_in *i4;
    struct sockaddr_in6 *i6;

    switch (e->ai_family) {
    case PF_INET6:
        i6 = (void*)e->ai_addr;
        i6->sin6_port = htons(port);
        break;
    case PF_INET:
        i4 = (void*)e->ai_addr;
        i4->sin_port = htons(port);
        break;
    }
}

const char *inet_strfamily(int family)
{
    switch (family) {
    case PF_INET6: return "ipv6";
    case PF_INET:  return "ipv4";
    case PF_UNIX:  return "unix";
    }
    return "unknown";
}

int inet_listen_opts(QemuOpts *opts, int port_offset, Error **errp)
{
    struct addrinfo ai,*res,*e;
    const char *addr;
    char port[33];
    char uaddr[INET6_ADDRSTRLEN+1];
    char uport[33];
    int slisten, rc, to, port_min, port_max, p;

    memset(&ai,0, sizeof(ai));
    ai.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
    ai.ai_family = PF_UNSPEC;
    ai.ai_socktype = SOCK_STREAM;

    if ((qemu_opt_get(opts, "host") == NULL) ||
        (qemu_opt_get(opts, "port") == NULL)) {
        error_setg(errp, "host and/or port not specified");
        return -1;
    }
    pstrcpy(port, sizeof(port), qemu_opt_get(opts, "port"));
    addr = qemu_opt_get(opts, "host");

    to = qemu_opt_get_number(opts, "to", 0);
    if (qemu_opt_get_bool(opts, "ipv4", 0))
        ai.ai_family = PF_INET;
    if (qemu_opt_get_bool(opts, "ipv6", 0))
        ai.ai_family = PF_INET6;

    /* lookup */
    if (port_offset)
        snprintf(port, sizeof(port), "%d", atoi(port) + port_offset);
    rc = getaddrinfo(strlen(addr) ? addr : NULL, port, &ai, &res);
    if (rc != 0) {
        error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
                   gai_strerror(rc));
        return -1;
    }

    /* create socket + bind */
    for (e = res; e != NULL; e = e->ai_next) {
        getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
		        uaddr,INET6_ADDRSTRLEN,uport,32,
		        NI_NUMERICHOST | NI_NUMERICSERV);
        slisten = qemu_socket(e->ai_family, e->ai_socktype, e->ai_protocol);
        if (slisten < 0) {
            if (!e->ai_next) {
                error_set_errno(errp, errno, QERR_SOCKET_CREATE_FAILED);
            }
            continue;
        }

        qemu_setsockopt(slisten, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
#ifdef IPV6_V6ONLY
        if (e->ai_family == PF_INET6) {
            /* listen on both ipv4 and ipv6 */
            qemu_setsockopt(slisten, IPPROTO_IPV6, IPV6_V6ONLY, &off,
                            sizeof(off));
        }
#endif

        port_min = inet_getport(e);
        port_max = to ? to + port_offset : port_min;
        for (p = port_min; p <= port_max; p++) {
            inet_setport(e, p);
            if (bind(slisten, e->ai_addr, e->ai_addrlen) == 0) {
                goto listen;
            }
            if (p == port_max) {
                if (!e->ai_next) {
                    error_set_errno(errp, errno, QERR_SOCKET_BIND_FAILED);
                }
            }
        }
        closesocket(slisten);
    }
    freeaddrinfo(res);
    return -1;

listen:
    if (listen(slisten,1) != 0) {
        error_set_errno(errp, errno, QERR_SOCKET_LISTEN_FAILED);
        closesocket(slisten);
        freeaddrinfo(res);
        return -1;
    }
    snprintf(uport, sizeof(uport), "%d", inet_getport(e) - port_offset);
    qemu_opt_set(opts, "host", uaddr);
    qemu_opt_set(opts, "port", uport);
    qemu_opt_set(opts, "ipv6", (e->ai_family == PF_INET6) ? "on" : "off");
    qemu_opt_set(opts, "ipv4", (e->ai_family != PF_INET6) ? "on" : "off");
    freeaddrinfo(res);
    return slisten;
}

#ifdef _WIN32
#define QEMU_SOCKET_RC_INPROGRESS(rc) \
    ((rc) == -EINPROGRESS || (rc) == -EWOULDBLOCK || (rc) == -WSAEALREADY)
#else
#define QEMU_SOCKET_RC_INPROGRESS(rc) \
    ((rc) == -EINPROGRESS)
#endif

/* Struct to store connect state for non blocking connect */
typedef struct ConnectState {
    int fd;
    struct addrinfo *addr_list;
    struct addrinfo *current_addr;
    NonBlockingConnectHandler *callback;
    void *opaque;
} ConnectState;

static int inet_connect_addr(struct addrinfo *addr, bool *in_progress,
                             ConnectState *connect_state, Error **errp);

static void wait_for_connect(void *opaque)
{
    ConnectState *s = opaque;
    int val = 0, rc = 0;
    socklen_t valsize = sizeof(val);
    bool in_progress;

    qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);

    do {
        rc = qemu_getsockopt(s->fd, SOL_SOCKET, SO_ERROR, &val, &valsize);
    } while (rc == -1 && socket_error() == EINTR);

    /* update rc to contain error */
    if (!rc && val) {
        rc = -1;
    }

    /* connect error */
    if (rc < 0) {
        closesocket(s->fd);
        s->fd = rc;
    }

    /* try to connect to the next address on the list */
    if (s->current_addr) {
        while (s->current_addr->ai_next != NULL && s->fd < 0) {
            s->current_addr = s->current_addr->ai_next;
            s->fd = inet_connect_addr(s->current_addr, &in_progress, s, NULL);
            /* connect in progress */
            if (in_progress) {
                return;
            }
        }

        freeaddrinfo(s->addr_list);
    }

    if (s->callback) {
        s->callback(s->fd, s->opaque);
    }
    g_free(s);
}

static int inet_connect_addr(struct addrinfo *addr, bool *in_progress,
                             ConnectState *connect_state, Error **errp)
{
    int sock, rc;

    *in_progress = false;

    sock = qemu_socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
    if (sock < 0) {
        error_set_errno(errp, errno, QERR_SOCKET_CREATE_FAILED);
        return -1;
    }
    qemu_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
    if (connect_state != NULL) {
        socket_set_nonblock(sock);
    }
    /* connect to peer */
    do {
        rc = 0;
        if (connect(sock, addr->ai_addr, addr->ai_addrlen) < 0) {
            rc = -socket_error();
        }
    } while (rc == -EINTR);

    if (connect_state != NULL && QEMU_SOCKET_RC_INPROGRESS(rc)) {
        connect_state->fd = sock;
        qemu_set_fd_handler2(sock, NULL, NULL, wait_for_connect,
                             connect_state);
        *in_progress = true;
    } else if (rc < 0) {
        error_set_errno(errp, errno, QERR_SOCKET_CONNECT_FAILED);
        closesocket(sock);
        return -1;
    }
    return sock;
}

static struct addrinfo *inet_parse_connect_opts(QemuOpts *opts, Error **errp)
{
    struct addrinfo ai, *res;
    int rc;
    const char *addr;
    const char *port;

    memset(&ai, 0, sizeof(ai));

    ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
    ai.ai_family = PF_UNSPEC;
    ai.ai_socktype = SOCK_STREAM;

    addr = qemu_opt_get(opts, "host");
    port = qemu_opt_get(opts, "port");
    if (addr == NULL || port == NULL) {
        error_setg(errp, "host and/or port not specified");
        return NULL;
    }

    if (qemu_opt_get_bool(opts, "ipv4", 0)) {
        ai.ai_family = PF_INET;
    }
    if (qemu_opt_get_bool(opts, "ipv6", 0)) {
        ai.ai_family = PF_INET6;
    }

    /* lookup */
    rc = getaddrinfo(addr, port, &ai, &res);
    if (rc != 0) {
        error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
                   gai_strerror(rc));
        return NULL;
    }
    return res;
}

/**
 * Create a socket and connect it to an address.
 *
 * @opts: QEMU options, recognized parameters strings "host" and "port",
 *        bools "ipv4" and "ipv6".
 * @errp: set on error
 * @callback: callback function for non-blocking connect
 * @opaque: opaque for callback function
 *
 * Returns: -1 on error, file descriptor on success.
 *
 * If @callback is non-null, the connect is non-blocking.  If this
 * function succeeds, callback will be called when the connection
 * completes, with the file descriptor on success, or -1 on error.
 */
int inet_connect_opts(QemuOpts *opts, Error **errp,
                      NonBlockingConnectHandler *callback, void *opaque)
{
    struct addrinfo *res, *e;
    int sock = -1;
    bool in_progress;
    ConnectState *connect_state = NULL;

    res = inet_parse_connect_opts(opts, errp);
    if (!res) {
        return -1;
    }

    if (callback != NULL) {
        connect_state = g_malloc0(sizeof(*connect_state));
        connect_state->addr_list = res;
        connect_state->callback = callback;
        connect_state->opaque = opaque;
    }

    for (e = res; e != NULL; e = e->ai_next) {
        if (error_is_set(errp)) {
            error_free(*errp);
            *errp = NULL;
        }
        if (connect_state != NULL) {
            connect_state->current_addr = e;
        }
        sock = inet_connect_addr(e, &in_progress, connect_state, errp);
        if (in_progress) {
            return sock;
        } else if (sock >= 0) {
            /* non blocking socket immediate success, call callback */
            if (callback != NULL) {
                callback(sock, opaque);
            }
            break;
        }
    }
    g_free(connect_state);
    freeaddrinfo(res);
    return sock;
}

int inet_dgram_opts(QemuOpts *opts, Error **errp)
{
    struct addrinfo ai, *peer = NULL, *local = NULL;
    const char *addr;
    const char *port;
    int sock = -1, rc;

    /* lookup peer addr */
    memset(&ai,0, sizeof(ai));
    ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
    ai.ai_family = PF_UNSPEC;
    ai.ai_socktype = SOCK_DGRAM;

    addr = qemu_opt_get(opts, "host");
    port = qemu_opt_get(opts, "port");
    if (addr == NULL || strlen(addr) == 0) {
        addr = "localhost";
    }
    if (port == NULL || strlen(port) == 0) {
        error_setg(errp, "remote port not specified");
        return -1;
    }

    if (qemu_opt_get_bool(opts, "ipv4", 0))
        ai.ai_family = PF_INET;
    if (qemu_opt_get_bool(opts, "ipv6", 0))
        ai.ai_family = PF_INET6;

    if (0 != (rc = getaddrinfo(addr, port, &ai, &peer))) {
        error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
                   gai_strerror(rc));
	return -1;
    }

    /* lookup local addr */
    memset(&ai,0, sizeof(ai));
    ai.ai_flags = AI_PASSIVE;
    ai.ai_family = peer->ai_family;
    ai.ai_socktype = SOCK_DGRAM;

    addr = qemu_opt_get(opts, "localaddr");
    port = qemu_opt_get(opts, "localport");
    if (addr == NULL || strlen(addr) == 0) {
        addr = NULL;
    }
    if (!port || strlen(port) == 0)
        port = "0";

    if (0 != (rc = getaddrinfo(addr, port, &ai, &local))) {
        error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
                   gai_strerror(rc));
        goto err;
    }

    /* create socket */
    sock = qemu_socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol);
    if (sock < 0) {
        error_set_errno(errp, errno, QERR_SOCKET_CREATE_FAILED);
        goto err;
    }
    qemu_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));

    /* bind socket */
    if (bind(sock, local->ai_addr, local->ai_addrlen) < 0) {
        error_set_errno(errp, errno, QERR_SOCKET_BIND_FAILED);
        goto err;
    }

    /* connect to peer */
    if (connect(sock,peer->ai_addr,peer->ai_addrlen) < 0) {
        error_set_errno(errp, errno, QERR_SOCKET_CONNECT_FAILED);
        goto err;
    }

    freeaddrinfo(local);
    freeaddrinfo(peer);
    return sock;

err:
    if (-1 != sock)
        closesocket(sock);
    if (local)
        freeaddrinfo(local);
    if (peer)
        freeaddrinfo(peer);
    return -1;
}

/* compatibility wrapper */
InetSocketAddress *inet_parse(const char *str, Error **errp)
{
    InetSocketAddress *addr;
    const char *optstr, *h;
    char host[64];
    char port[33];
    int to;
    int pos;

    addr = g_new0(InetSocketAddress, 1);

    /* parse address */
    if (str[0] == ':') {
        /* no host given */
        host[0] = '\0';
        if (1 != sscanf(str, ":%32[^,]%n", port, &pos)) {
            error_setg(errp, "error parsing port in address '%s'", str);
            goto fail;
        }
    } else if (str[0] == '[') {
        /* IPv6 addr */
        if (2 != sscanf(str, "[%64[^]]]:%32[^,]%n", host, port, &pos)) {
            error_setg(errp, "error parsing IPv6 address '%s'", str);
            goto fail;
        }
        addr->ipv6 = addr->has_ipv6 = true;
    } else if (qemu_isdigit(str[0])) {
        /* IPv4 addr */
        if (2 != sscanf(str, "%64[0-9.]:%32[^,]%n", host, port, &pos)) {
            error_setg(errp, "error parsing IPv4 address '%s'", str);
            goto fail;
        }
        addr->ipv4 = addr->has_ipv4 = true;
    } else {
        /* hostname */
        if (2 != sscanf(str, "%64[^:]:%32[^,]%n", host, port, &pos)) {
            error_setg(errp, "error parsing address '%s'", str);
            goto fail;
        }
    }

    addr->host = g_strdup(host);
    addr->port = g_strdup(port);

    /* parse options */
    optstr = str + pos;
    h = strstr(optstr, ",to=");
    if (h) {
        h += 4;
        if (sscanf(h, "%d%n", &to, &pos) != 1 ||
            (h[pos] != '\0' && h[pos] != ',')) {
            error_setg(errp, "error parsing to= argument");
            goto fail;
        }
        addr->has_to = true;
        addr->to = to;
    }
    if (strstr(optstr, ",ipv4")) {
        addr->ipv4 = addr->has_ipv4 = true;
    }
    if (strstr(optstr, ",ipv6")) {
        addr->ipv6 = addr->has_ipv6 = true;
    }
    return addr;

fail:
    qapi_free_InetSocketAddress(addr);
    return NULL;
}

static void inet_addr_to_opts(QemuOpts *opts, const InetSocketAddress *addr)
{
    bool ipv4 = addr->ipv4 || !addr->has_ipv4;
    bool ipv6 = addr->ipv6 || !addr->has_ipv6;

    if (!ipv4 || !ipv6) {
        qemu_opt_set_bool(opts, "ipv4", ipv4);
        qemu_opt_set_bool(opts, "ipv6", ipv6);
    }
    if (addr->has_to) {
        char to[20];
        snprintf(to, sizeof(to), "%d", addr->to);
        qemu_opt_set(opts, "to", to);
    }
    qemu_opt_set(opts, "host", addr->host);
    qemu_opt_set(opts, "port", addr->port);
}

int inet_listen(const char *str, char *ostr, int olen,
                int socktype, int port_offset, Error **errp)
{
    QemuOpts *opts;
    char *optstr;
    int sock = -1;
    InetSocketAddress *addr;

    addr = inet_parse(str, errp);
    if (addr != NULL) {
        opts = qemu_opts_create_nofail(&socket_optslist);
        inet_addr_to_opts(opts, addr);
        qapi_free_InetSocketAddress(addr);
        sock = inet_listen_opts(opts, port_offset, errp);
        if (sock != -1 && ostr) {
            optstr = strchr(str, ',');
            if (qemu_opt_get_bool(opts, "ipv6", 0)) {
                snprintf(ostr, olen, "[%s]:%s%s",
                         qemu_opt_get(opts, "host"),
                         qemu_opt_get(opts, "port"),
                         optstr ? optstr : "");
            } else {
                snprintf(ostr, olen, "%s:%s%s",
                         qemu_opt_get(opts, "host"),
                         qemu_opt_get(opts, "port"),
                         optstr ? optstr : "");
            }
        }
        qemu_opts_del(opts);
    }
    return sock;
}

/**
 * Create a blocking socket and connect it to an address.
 *
 * @str: address string
 * @errp: set in case of an error
 *
 * Returns -1 in case of error, file descriptor on success
 **/
int inet_connect(const char *str, Error **errp)
{
    QemuOpts *opts;
    int sock = -1;
    InetSocketAddress *addr;

    addr = inet_parse(str, errp);
    if (addr != NULL) {
        opts = qemu_opts_create_nofail(&socket_optslist);
        inet_addr_to_opts(opts, addr);
        qapi_free_InetSocketAddress(addr);
        sock = inet_connect_opts(opts, errp, NULL, NULL);
        qemu_opts_del(opts);
    }
    return sock;
}

/**
 * Create a non-blocking socket and connect it to an address.
 * Calls the callback function with fd in case of success or -1 in case of
 * error.
 *
 * @str: address string
 * @callback: callback function that is called when connect completes,
 *            cannot be NULL.
 * @opaque: opaque for callback function
 * @errp: set in case of an error
 *
 * Returns: -1 on immediate error, file descriptor on success.
 **/
int inet_nonblocking_connect(const char *str,
                             NonBlockingConnectHandler *callback,
                             void *opaque, Error **errp)
{
    QemuOpts *opts;
    int sock = -1;
    InetSocketAddress *addr;

    g_assert(callback != NULL);

    addr = inet_parse(str, errp);
    if (addr != NULL) {
        opts = qemu_opts_create_nofail(&socket_optslist);
        inet_addr_to_opts(opts, addr);
        qapi_free_InetSocketAddress(addr);
        sock = inet_connect_opts(opts, errp, callback, opaque);
        qemu_opts_del(opts);
    }
    return sock;
}

#ifndef _WIN32

int unix_listen_opts(QemuOpts *opts, Error **errp)
{
    struct sockaddr_un un;
    const char *path = qemu_opt_get(opts, "path");
    int sock, fd;

    sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
    if (sock < 0) {
        error_set_errno(errp, errno, QERR_SOCKET_CREATE_FAILED);
        return -1;
    }

    memset(&un, 0, sizeof(un));
    un.sun_family = AF_UNIX;
    if (path && strlen(path)) {
        snprintf(un.sun_path, sizeof(un.sun_path), "%s", path);
    } else {
        char *tmpdir = getenv("TMPDIR");
        snprintf(un.sun_path, sizeof(un.sun_path), "%s/qemu-socket-XXXXXX",
                 tmpdir ? tmpdir : "/tmp");
        /*
         * This dummy fd usage silences the mktemp() unsecure warning.
         * Using mkstemp() doesn't make things more secure here
         * though.  bind() complains about existing files, so we have
         * to unlink first and thus re-open the race window.  The
         * worst case possible is bind() failing, i.e. a DoS attack.
         */
        fd = mkstemp(un.sun_path); close(fd);
        qemu_opt_set(opts, "path", un.sun_path);
    }

    unlink(un.sun_path);
    if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) {
        error_set_errno(errp, errno, QERR_SOCKET_BIND_FAILED);
        goto err;
    }
    if (listen(sock, 1) < 0) {
        error_set_errno(errp, errno, QERR_SOCKET_LISTEN_FAILED);
        goto err;
    }

    return sock;

err:
    closesocket(sock);
    return -1;
}

int unix_connect_opts(QemuOpts *opts, Error **errp,
                      NonBlockingConnectHandler *callback, void *opaque)
{
    struct sockaddr_un un;
    const char *path = qemu_opt_get(opts, "path");
    ConnectState *connect_state = NULL;
    int sock, rc;

    if (NULL == path) {
        error_setg(errp, "unix connect: no path specified");
        return -1;
    }

    sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
    if (sock < 0) {
        error_set_errno(errp, errno, QERR_SOCKET_CREATE_FAILED);
        return -1;
    }
    if (callback != NULL) {
        connect_state = g_malloc0(sizeof(*connect_state));
        connect_state->callback = callback;
        connect_state->opaque = opaque;
        socket_set_nonblock(sock);
    }

    memset(&un, 0, sizeof(un));
    un.sun_family = AF_UNIX;
    snprintf(un.sun_path, sizeof(un.sun_path), "%s", path);

    /* connect to peer */
    do {
        rc = 0;
        if (connect(sock, (struct sockaddr *) &un, sizeof(un)) < 0) {
            rc = -socket_error();
        }
    } while (rc == -EINTR);

    if (connect_state != NULL && QEMU_SOCKET_RC_INPROGRESS(rc)) {
        connect_state->fd = sock;
        qemu_set_fd_handler2(sock, NULL, NULL, wait_for_connect,
                             connect_state);
        return sock;
    } else if (rc >= 0) {
        /* non blocking socket immediate success, call callback */
        if (callback != NULL) {
            callback(sock, opaque);
        }
    }

    if (rc < 0) {
        error_set_errno(errp, -rc, QERR_SOCKET_CONNECT_FAILED);
        close(sock);
        sock = -1;
    }

    g_free(connect_state);
    return sock;
}

#else

int unix_listen_opts(QemuOpts *opts, Error **errp)
{
    error_setg(errp, "unix sockets are not available on windows");
    errno = ENOTSUP;
    return -1;
}

int unix_connect_opts(QemuOpts *opts, Error **errp,
                      NonBlockingConnectHandler *callback, void *opaque)
{
    error_setg(errp, "unix sockets are not available on windows");
    errno = ENOTSUP;
    return -1;
}
#endif

/* compatibility wrapper */
int unix_listen(const char *str, char *ostr, int olen, Error **errp)
{
    QemuOpts *opts;
    char *path, *optstr;
    int sock, len;

    opts = qemu_opts_create_nofail(&socket_optslist);

    optstr = strchr(str, ',');
    if (optstr) {
        len = optstr - str;
        if (len) {
            path = g_malloc(len+1);
            snprintf(path, len+1, "%.*s", len, str);
            qemu_opt_set(opts, "path", path);
            g_free(path);
        }
    } else {
        qemu_opt_set(opts, "path", str);
    }

    sock = unix_listen_opts(opts, errp);

    if (sock != -1 && ostr)
        snprintf(ostr, olen, "%s%s", qemu_opt_get(opts, "path"), optstr ? optstr : "");
    qemu_opts_del(opts);
    return sock;
}

int unix_connect(const char *path, Error **errp)
{
    QemuOpts *opts;
    int sock;

    opts = qemu_opts_create_nofail(&socket_optslist);
    qemu_opt_set(opts, "path", path);
    sock = unix_connect_opts(opts, errp, NULL, NULL);
    qemu_opts_del(opts);
    return sock;
}


int unix_nonblocking_connect(const char *path,
                             NonBlockingConnectHandler *callback,
                             void *opaque, Error **errp)
{
    QemuOpts *opts;
    int sock = -1;

    g_assert(callback != NULL);

    opts = qemu_opts_create_nofail(&socket_optslist);
    qemu_opt_set(opts, "path", path);
    sock = unix_connect_opts(opts, errp, callback, opaque);
    qemu_opts_del(opts);
    return sock;
}

SocketAddress *socket_parse(const char *str, Error **errp)
{
    SocketAddress *addr = NULL;

    addr = g_new(SocketAddress, 1);
    if (strstart(str, "unix:", NULL)) {
        if (str[5] == '\0') {
            error_setg(errp, "invalid Unix socket address");
            goto fail;
        } else {
            addr->kind = SOCKET_ADDRESS_KIND_UNIX;
            addr->q_unix = g_new(UnixSocketAddress, 1);
            addr->q_unix->path = g_strdup(str + 5);
        }
    } else if (strstart(str, "fd:", NULL)) {
        if (str[3] == '\0') {
            error_setg(errp, "invalid file descriptor address");
            goto fail;
        } else {
            addr->kind = SOCKET_ADDRESS_KIND_FD;
            addr->fd = g_new(String, 1);
            addr->fd->str = g_strdup(str + 3);
        }
    } else {
        addr->kind = SOCKET_ADDRESS_KIND_INET;
        addr->inet = g_new(InetSocketAddress, 1);
        addr->inet = inet_parse(str, errp);
        if (addr->inet == NULL) {
            goto fail;
        }
    }
    return addr;

fail:
    qapi_free_SocketAddress(addr);
    return NULL;
}

int socket_connect(SocketAddress *addr, Error **errp,
                   NonBlockingConnectHandler *callback, void *opaque)
{
    QemuOpts *opts;
    int fd;

    opts = qemu_opts_create_nofail(&socket_optslist);
    switch (addr->kind) {
    case SOCKET_ADDRESS_KIND_INET:
        inet_addr_to_opts(opts, addr->inet);
        fd = inet_connect_opts(opts, errp, callback, opaque);
        break;

    case SOCKET_ADDRESS_KIND_UNIX:
        qemu_opt_set(opts, "path", addr->q_unix->path);
        fd = unix_connect_opts(opts, errp, callback, opaque);
        break;

    case SOCKET_ADDRESS_KIND_FD:
        fd = monitor_get_fd(cur_mon, addr->fd->str, errp);
        if (callback) {
            callback(fd, opaque);
        }
        break;

    default:
        abort();
    }
    qemu_opts_del(opts);
    return fd;
}

int socket_listen(SocketAddress *addr, Error **errp)
{
    QemuOpts *opts;
    int fd;

    opts = qemu_opts_create_nofail(&socket_optslist);
    switch (addr->kind) {
    case SOCKET_ADDRESS_KIND_INET:
        inet_addr_to_opts(opts, addr->inet);
        fd = inet_listen_opts(opts, 0, errp);
        break;

    case SOCKET_ADDRESS_KIND_UNIX:
        qemu_opt_set(opts, "path", addr->q_unix->path);
        fd = unix_listen_opts(opts, errp);
        break;

    case SOCKET_ADDRESS_KIND_FD:
        fd = monitor_get_fd(cur_mon, addr->fd->str, errp);
        break;

    default:
        abort();
    }
    qemu_opts_del(opts);
    return fd;
}

int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp)
{
    QemuOpts *opts;
    int fd;

    opts = qemu_opts_create_nofail(&socket_optslist);
    switch (remote->kind) {
    case SOCKET_ADDRESS_KIND_INET:
        qemu_opt_set(opts, "host", remote->inet->host);
        qemu_opt_set(opts, "port", remote->inet->port);
        if (local) {
            qemu_opt_set(opts, "localaddr", local->inet->host);
            qemu_opt_set(opts, "localport", local->inet->port);
        }
        fd = inet_dgram_opts(opts, errp);
        break;

    default:
        error_setg(errp, "socket type unsupported for datagram");
        return -1;
    }
    qemu_opts_del(opts);
    return fd;
}

#ifdef _WIN32
static void socket_cleanup(void)
{
    WSACleanup();
}
#endif

int socket_init(void)
{
#ifdef _WIN32
    WSADATA Data;
    int ret, err;

    ret = WSAStartup(MAKEWORD(2,2), &Data);
    if (ret != 0) {
        err = WSAGetLastError();
        fprintf(stderr, "WSAStartup: %d\n", err);
        return -1;
    }
    atexit(socket_cleanup);
#endif
    return 0;
}