forked from qemu/qemu
-
Notifications
You must be signed in to change notification settings - Fork 3
/
slirp.c
1124 lines (979 loc) · 31.3 KB
/
slirp.c
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
1000
/*
* QEMU System Emulator
*
* Copyright (c) 2003-2008 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "net/slirp.h"
#if defined(CONFIG_SLIRP_SMBD)
#include <pwd.h>
#include <sys/wait.h>
#endif
#include "net/eth.h"
#include "net/net.h"
#include "clients.h"
#include "hub.h"
#include "monitor/monitor.h"
#include "qemu/error-report.h"
#include "qemu/sockets.h"
#include <libslirp.h>
#include "chardev/char-fe.h"
#include "sysemu/sysemu.h"
#include "qemu/cutils.h"
#include "qapi/error.h"
#include "qapi/qmp/qdict.h"
#include "util.h"
#include "migration/register.h"
#include "migration/qemu-file-types.h"
static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
{
const char *p, *p1;
int len;
p = *pp;
p1 = strchr(p, sep);
if (!p1)
return -1;
len = p1 - p;
p1++;
if (buf_size > 0) {
if (len > buf_size - 1)
len = buf_size - 1;
memcpy(buf, p, len);
buf[len] = '\0';
}
*pp = p1;
return 0;
}
/* slirp network adapter */
#define SLIRP_CFG_HOSTFWD 1
struct slirp_config_str {
struct slirp_config_str *next;
int flags;
char str[1024];
};
struct GuestFwd {
CharBackend hd;
struct in_addr server;
int port;
Slirp *slirp;
};
typedef struct SlirpState {
NetClientState nc;
QTAILQ_ENTRY(SlirpState) entry;
Slirp *slirp;
Notifier poll_notifier;
Notifier exit_notifier;
#if defined(CONFIG_SLIRP_SMBD)
gchar *smb_dir;
#endif
GSList *fwd;
} SlirpState;
static struct slirp_config_str *slirp_configs;
static QTAILQ_HEAD(, SlirpState) slirp_stacks =
QTAILQ_HEAD_INITIALIZER(slirp_stacks);
static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp);
static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp);
#if defined(CONFIG_SLIRP_SMBD)
static int slirp_smb(SlirpState *s, const char *exported_dir,
struct in_addr vserver_addr, Error **errp);
static void slirp_smb_cleanup(SlirpState *s);
#else
static inline void slirp_smb_cleanup(SlirpState *s) { }
#endif
static ssize_t net_slirp_send_packet(const void *pkt, size_t pkt_len,
void *opaque)
{
SlirpState *s = opaque;
uint8_t min_pkt[ETH_ZLEN];
size_t min_pktsz = sizeof(min_pkt);
if (net_peer_needs_padding(&s->nc)) {
if (eth_pad_short_frame(min_pkt, &min_pktsz, pkt, pkt_len)) {
pkt = min_pkt;
pkt_len = min_pktsz;
}
}
return qemu_send_packet(&s->nc, pkt, pkt_len);
}
static ssize_t net_slirp_receive(NetClientState *nc, const uint8_t *buf, size_t size)
{
SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
slirp_input(s->slirp, buf, size);
return size;
}
static void slirp_smb_exit(Notifier *n, void *data)
{
SlirpState *s = container_of(n, SlirpState, exit_notifier);
slirp_smb_cleanup(s);
}
static void slirp_free_fwd(gpointer data)
{
struct GuestFwd *fwd = data;
qemu_chr_fe_deinit(&fwd->hd, true);
g_free(data);
}
static void net_slirp_cleanup(NetClientState *nc)
{
SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
g_slist_free_full(s->fwd, slirp_free_fwd);
main_loop_poll_remove_notifier(&s->poll_notifier);
unregister_savevm(NULL, "slirp", s->slirp);
slirp_cleanup(s->slirp);
if (s->exit_notifier.notify) {
qemu_remove_exit_notifier(&s->exit_notifier);
}
slirp_smb_cleanup(s);
QTAILQ_REMOVE(&slirp_stacks, s, entry);
}
static NetClientInfo net_slirp_info = {
.type = NET_CLIENT_DRIVER_USER,
.size = sizeof(SlirpState),
.receive = net_slirp_receive,
.cleanup = net_slirp_cleanup,
};
static void net_slirp_guest_error(const char *msg, void *opaque)
{
qemu_log_mask(LOG_GUEST_ERROR, "%s", msg);
}
static int64_t net_slirp_clock_get_ns(void *opaque)
{
return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
}
static void *net_slirp_timer_new(SlirpTimerCb cb,
void *cb_opaque, void *opaque)
{
return timer_new_full(NULL, QEMU_CLOCK_VIRTUAL,
SCALE_MS, QEMU_TIMER_ATTR_EXTERNAL,
cb, cb_opaque);
}
static void net_slirp_timer_free(void *timer, void *opaque)
{
timer_free(timer);
}
static void net_slirp_timer_mod(void *timer, int64_t expire_timer,
void *opaque)
{
timer_mod(timer, expire_timer);
}
static void net_slirp_register_poll_fd(int fd, void *opaque)
{
qemu_fd_register(fd);
}
static void net_slirp_unregister_poll_fd(int fd, void *opaque)
{
/* no qemu_fd_unregister */
}
static void net_slirp_notify(void *opaque)
{
qemu_notify_event();
}
static const SlirpCb slirp_cb = {
.send_packet = net_slirp_send_packet,
.guest_error = net_slirp_guest_error,
.clock_get_ns = net_slirp_clock_get_ns,
.timer_new = net_slirp_timer_new,
.timer_free = net_slirp_timer_free,
.timer_mod = net_slirp_timer_mod,
.register_poll_fd = net_slirp_register_poll_fd,
.unregister_poll_fd = net_slirp_unregister_poll_fd,
.notify = net_slirp_notify,
};
static int slirp_poll_to_gio(int events)
{
int ret = 0;
if (events & SLIRP_POLL_IN) {
ret |= G_IO_IN;
}
if (events & SLIRP_POLL_OUT) {
ret |= G_IO_OUT;
}
if (events & SLIRP_POLL_PRI) {
ret |= G_IO_PRI;
}
if (events & SLIRP_POLL_ERR) {
ret |= G_IO_ERR;
}
if (events & SLIRP_POLL_HUP) {
ret |= G_IO_HUP;
}
return ret;
}
static int net_slirp_add_poll(int fd, int events, void *opaque)
{
GArray *pollfds = opaque;
GPollFD pfd = {
.fd = fd,
.events = slirp_poll_to_gio(events),
};
int idx = pollfds->len;
g_array_append_val(pollfds, pfd);
return idx;
}
static int slirp_gio_to_poll(int events)
{
int ret = 0;
if (events & G_IO_IN) {
ret |= SLIRP_POLL_IN;
}
if (events & G_IO_OUT) {
ret |= SLIRP_POLL_OUT;
}
if (events & G_IO_PRI) {
ret |= SLIRP_POLL_PRI;
}
if (events & G_IO_ERR) {
ret |= SLIRP_POLL_ERR;
}
if (events & G_IO_HUP) {
ret |= SLIRP_POLL_HUP;
}
return ret;
}
static int net_slirp_get_revents(int idx, void *opaque)
{
GArray *pollfds = opaque;
return slirp_gio_to_poll(g_array_index(pollfds, GPollFD, idx).revents);
}
static void net_slirp_poll_notify(Notifier *notifier, void *data)
{
MainLoopPoll *poll = data;
SlirpState *s = container_of(notifier, SlirpState, poll_notifier);
switch (poll->state) {
case MAIN_LOOP_POLL_FILL:
slirp_pollfds_fill(s->slirp, &poll->timeout,
net_slirp_add_poll, poll->pollfds);
break;
case MAIN_LOOP_POLL_OK:
case MAIN_LOOP_POLL_ERR:
slirp_pollfds_poll(s->slirp, poll->state == MAIN_LOOP_POLL_ERR,
net_slirp_get_revents, poll->pollfds);
break;
default:
g_assert_not_reached();
}
}
static ssize_t
net_slirp_stream_read(void *buf, size_t size, void *opaque)
{
QEMUFile *f = opaque;
return qemu_get_buffer(f, buf, size);
}
static ssize_t
net_slirp_stream_write(const void *buf, size_t size, void *opaque)
{
QEMUFile *f = opaque;
qemu_put_buffer(f, buf, size);
if (qemu_file_get_error(f)) {
return -1;
}
return size;
}
static int net_slirp_state_load(QEMUFile *f, void *opaque, int version_id)
{
Slirp *slirp = opaque;
return slirp_state_load(slirp, version_id, net_slirp_stream_read, f);
}
static void net_slirp_state_save(QEMUFile *f, void *opaque)
{
Slirp *slirp = opaque;
slirp_state_save(slirp, net_slirp_stream_write, f);
}
static SaveVMHandlers savevm_slirp_state = {
.save_state = net_slirp_state_save,
.load_state = net_slirp_state_load,
};
static int net_slirp_init(NetClientState *peer, const char *model,
const char *name, int restricted,
bool ipv4, const char *vnetwork, const char *vhost,
bool ipv6, const char *vprefix6, int vprefix6_len,
const char *vhost6,
const char *vhostname, const char *tftp_export,
const char *bootfile, const char *vdhcp_start,
const char *vnameserver, const char *vnameserver6,
const char *smb_export, const char *vsmbserver,
const char **dnssearch, const char *vdomainname,
const char *tftp_server_name,
Error **errp)
{
/* default settings according to historic slirp */
struct in_addr net = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */
struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */
struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */
struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */
struct in_addr dns = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */
struct in6_addr ip6_prefix;
struct in6_addr ip6_host;
struct in6_addr ip6_dns;
#if defined(CONFIG_SLIRP_SMBD)
struct in_addr smbsrv = { .s_addr = 0 };
#endif
NetClientState *nc;
SlirpState *s;
char buf[20];
uint32_t addr;
int shift;
char *end;
struct slirp_config_str *config;
if (!ipv4 && (vnetwork || vhost || vnameserver)) {
error_setg(errp, "IPv4 disabled but netmask/host/dns provided");
return -1;
}
if (!ipv6 && (vprefix6 || vhost6 || vnameserver6)) {
error_setg(errp, "IPv6 disabled but prefix/host6/dns6 provided");
return -1;
}
if (!ipv4 && !ipv6) {
/* It doesn't make sense to disable both */
error_setg(errp, "IPv4 and IPv6 disabled");
return -1;
}
if (vnetwork) {
if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) {
if (!inet_aton(vnetwork, &net)) {
error_setg(errp, "Failed to parse netmask");
return -1;
}
addr = ntohl(net.s_addr);
if (!(addr & 0x80000000)) {
mask.s_addr = htonl(0xff000000); /* class A */
} else if ((addr & 0xfff00000) == 0xac100000) {
mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */
} else if ((addr & 0xc0000000) == 0x80000000) {
mask.s_addr = htonl(0xffff0000); /* class B */
} else if ((addr & 0xffff0000) == 0xc0a80000) {
mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */
} else if ((addr & 0xffff0000) == 0xc6120000) {
mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */
} else if ((addr & 0xe0000000) == 0xe0000000) {
mask.s_addr = htonl(0xffffff00); /* class C */
} else {
mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */
}
} else {
if (!inet_aton(buf, &net)) {
error_setg(errp, "Failed to parse netmask");
return -1;
}
shift = strtol(vnetwork, &end, 10);
if (*end != '\0') {
if (!inet_aton(vnetwork, &mask)) {
error_setg(errp,
"Failed to parse netmask (trailing chars)");
return -1;
}
} else if (shift < 4 || shift > 32) {
error_setg(errp,
"Invalid netmask provided (must be in range 4-32)");
return -1;
} else {
mask.s_addr = htonl(0xffffffff << (32 - shift));
}
}
net.s_addr &= mask.s_addr;
host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr);
dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr);
dns.s_addr = net.s_addr | (htonl(0x0203) & ~mask.s_addr);
}
if (vhost && !inet_aton(vhost, &host)) {
error_setg(errp, "Failed to parse host");
return -1;
}
if ((host.s_addr & mask.s_addr) != net.s_addr) {
error_setg(errp, "Host doesn't belong to network");
return -1;
}
if (vnameserver && !inet_aton(vnameserver, &dns)) {
error_setg(errp, "Failed to parse DNS");
return -1;
}
if (restricted && (dns.s_addr & mask.s_addr) != net.s_addr) {
error_setg(errp, "DNS doesn't belong to network");
return -1;
}
if (dns.s_addr == host.s_addr) {
error_setg(errp, "DNS must be different from host");
return -1;
}
if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) {
error_setg(errp, "Failed to parse DHCP start address");
return -1;
}
if ((dhcp.s_addr & mask.s_addr) != net.s_addr) {
error_setg(errp, "DHCP doesn't belong to network");
return -1;
}
if (dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) {
error_setg(errp, "DHCP must be different from host and DNS");
return -1;
}
#if defined(CONFIG_SLIRP_SMBD)
if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) {
error_setg(errp, "Failed to parse SMB address");
return -1;
}
#endif
if (!vprefix6) {
vprefix6 = "fec0::";
}
if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) {
error_setg(errp, "Failed to parse IPv6 prefix");
return -1;
}
if (!vprefix6_len) {
vprefix6_len = 64;
}
if (vprefix6_len < 0 || vprefix6_len > 126) {
error_setg(errp,
"Invalid IPv6 prefix provided "
"(IPv6 prefix length must be between 0 and 126)");
return -1;
}
if (vhost6) {
if (!inet_pton(AF_INET6, vhost6, &ip6_host)) {
error_setg(errp, "Failed to parse IPv6 host");
return -1;
}
if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) {
error_setg(errp, "IPv6 Host doesn't belong to network");
return -1;
}
} else {
ip6_host = ip6_prefix;
ip6_host.s6_addr[15] |= 2;
}
if (vnameserver6) {
if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) {
error_setg(errp, "Failed to parse IPv6 DNS");
return -1;
}
if (restricted && !in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) {
error_setg(errp, "IPv6 DNS doesn't belong to network");
return -1;
}
} else {
ip6_dns = ip6_prefix;
ip6_dns.s6_addr[15] |= 3;
}
if (vdomainname && !*vdomainname) {
error_setg(errp, "'domainname' parameter cannot be empty");
return -1;
}
if (vdomainname && strlen(vdomainname) > 255) {
error_setg(errp, "'domainname' parameter cannot exceed 255 bytes");
return -1;
}
if (vhostname && strlen(vhostname) > 255) {
error_setg(errp, "'vhostname' parameter cannot exceed 255 bytes");
return -1;
}
if (tftp_server_name && strlen(tftp_server_name) > 255) {
error_setg(errp, "'tftp-server-name' parameter cannot exceed 255 bytes");
return -1;
}
nc = qemu_new_net_client(&net_slirp_info, peer, model, name);
snprintf(nc->info_str, sizeof(nc->info_str),
"net=%s,restrict=%s", inet_ntoa(net),
restricted ? "on" : "off");
s = DO_UPCAST(SlirpState, nc, nc);
s->slirp = slirp_init(restricted, ipv4, net, mask, host,
ipv6, ip6_prefix, vprefix6_len, ip6_host,
vhostname, tftp_server_name,
tftp_export, bootfile, dhcp,
dns, ip6_dns, dnssearch, vdomainname,
&slirp_cb, s);
QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry);
/*
* Make sure the current bitstream version of slirp is 4, to avoid
* QEMU migration incompatibilities, if upstream slirp bumped the
* version.
*
* FIXME: use bitfields of features? teach libslirp to save with
* specific version?
*/
g_assert(slirp_state_version() == 4);
register_savevm_live("slirp", 0, slirp_state_version(),
&savevm_slirp_state, s->slirp);
s->poll_notifier.notify = net_slirp_poll_notify;
main_loop_poll_add_notifier(&s->poll_notifier);
for (config = slirp_configs; config; config = config->next) {
if (config->flags & SLIRP_CFG_HOSTFWD) {
if (slirp_hostfwd(s, config->str, errp) < 0) {
goto error;
}
} else {
if (slirp_guestfwd(s, config->str, errp) < 0) {
goto error;
}
}
}
#if defined(CONFIG_SLIRP_SMBD)
if (smb_export) {
if (slirp_smb(s, smb_export, smbsrv, errp) < 0) {
goto error;
}
}
#endif
s->exit_notifier.notify = slirp_smb_exit;
qemu_add_exit_notifier(&s->exit_notifier);
return 0;
error:
qemu_del_net_client(nc);
return -1;
}
static SlirpState *slirp_lookup(Monitor *mon, const char *id)
{
if (id) {
NetClientState *nc = qemu_find_netdev(id);
if (!nc) {
monitor_printf(mon, "unrecognized netdev id '%s'\n", id);
return NULL;
}
if (strcmp(nc->model, "user")) {
monitor_printf(mon, "invalid device specified\n");
return NULL;
}
return DO_UPCAST(SlirpState, nc, nc);
} else {
if (QTAILQ_EMPTY(&slirp_stacks)) {
monitor_printf(mon, "user mode network stack not in use\n");
return NULL;
}
return QTAILQ_FIRST(&slirp_stacks);
}
}
void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict)
{
struct in_addr host_addr = { .s_addr = INADDR_ANY };
int host_port;
char buf[256];
const char *src_str, *p;
SlirpState *s;
int is_udp = 0;
int err;
const char *arg1 = qdict_get_str(qdict, "arg1");
const char *arg2 = qdict_get_try_str(qdict, "arg2");
if (arg2) {
s = slirp_lookup(mon, arg1);
src_str = arg2;
} else {
s = slirp_lookup(mon, NULL);
src_str = arg1;
}
if (!s) {
return;
}
p = src_str;
if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
goto fail_syntax;
}
if (!strcmp(buf, "tcp") || buf[0] == '\0') {
is_udp = 0;
} else if (!strcmp(buf, "udp")) {
is_udp = 1;
} else {
goto fail_syntax;
}
if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
goto fail_syntax;
}
if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
goto fail_syntax;
}
if (qemu_strtoi(p, NULL, 10, &host_port)) {
goto fail_syntax;
}
err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port);
monitor_printf(mon, "host forwarding rule for %s %s\n", src_str,
err ? "not found" : "removed");
return;
fail_syntax:
monitor_printf(mon, "invalid format\n");
}
static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp)
{
struct in_addr host_addr = { .s_addr = INADDR_ANY };
struct in_addr guest_addr = { .s_addr = 0 };
int host_port, guest_port;
const char *p;
char buf[256];
int is_udp;
char *end;
const char *fail_reason = "Unknown reason";
p = redir_str;
if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
fail_reason = "No : separators";
goto fail_syntax;
}
if (!strcmp(buf, "tcp") || buf[0] == '\0') {
is_udp = 0;
} else if (!strcmp(buf, "udp")) {
is_udp = 1;
} else {
fail_reason = "Bad protocol name";
goto fail_syntax;
}
if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
fail_reason = "Missing : separator";
goto fail_syntax;
}
if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
fail_reason = "Bad host address";
goto fail_syntax;
}
if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
fail_reason = "Bad host port separator";
goto fail_syntax;
}
host_port = strtol(buf, &end, 0);
if (*end != '\0' || host_port < 0 || host_port > 65535) {
fail_reason = "Bad host port";
goto fail_syntax;
}
if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
fail_reason = "Missing guest address";
goto fail_syntax;
}
if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) {
fail_reason = "Bad guest address";
goto fail_syntax;
}
guest_port = strtol(p, &end, 0);
if (*end != '\0' || guest_port < 1 || guest_port > 65535) {
fail_reason = "Bad guest port";
goto fail_syntax;
}
if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr,
guest_port) < 0) {
error_setg(errp, "Could not set up host forwarding rule '%s'",
redir_str);
return -1;
}
return 0;
fail_syntax:
error_setg(errp, "Invalid host forwarding rule '%s' (%s)", redir_str,
fail_reason);
return -1;
}
void hmp_hostfwd_add(Monitor *mon, const QDict *qdict)
{
const char *redir_str;
SlirpState *s;
const char *arg1 = qdict_get_str(qdict, "arg1");
const char *arg2 = qdict_get_try_str(qdict, "arg2");
if (arg2) {
s = slirp_lookup(mon, arg1);
redir_str = arg2;
} else {
s = slirp_lookup(mon, NULL);
redir_str = arg1;
}
if (s) {
Error *err = NULL;
if (slirp_hostfwd(s, redir_str, &err) < 0) {
error_report_err(err);
}
}
}
#if defined(CONFIG_SLIRP_SMBD)
/* automatic user mode samba server configuration */
static void slirp_smb_cleanup(SlirpState *s)
{
int ret;
if (s->smb_dir) {
gchar *cmd = g_strdup_printf("rm -rf %s", s->smb_dir);
ret = system(cmd);
if (ret == -1 || !WIFEXITED(ret)) {
error_report("'%s' failed.", cmd);
} else if (WEXITSTATUS(ret)) {
error_report("'%s' failed. Error code: %d",
cmd, WEXITSTATUS(ret));
}
g_free(cmd);
g_free(s->smb_dir);
s->smb_dir = NULL;
}
}
static int slirp_smb(SlirpState* s, const char *exported_dir,
struct in_addr vserver_addr, Error **errp)
{
char *smb_conf;
char *smb_cmdline;
struct passwd *passwd;
FILE *f;
passwd = getpwuid(geteuid());
if (!passwd) {
error_setg(errp, "Failed to retrieve user name");
return -1;
}
if (access(CONFIG_SMBD_COMMAND, F_OK)) {
error_setg(errp, "Could not find '%s', please install it",
CONFIG_SMBD_COMMAND);
return -1;
}
if (access(exported_dir, R_OK | X_OK)) {
error_setg(errp, "Error accessing shared directory '%s': %s",
exported_dir, strerror(errno));
return -1;
}
s->smb_dir = g_dir_make_tmp("qemu-smb.XXXXXX", NULL);
if (!s->smb_dir) {
error_setg(errp, "Could not create samba server dir");
return -1;
}
smb_conf = g_strdup_printf("%s/%s", s->smb_dir, "smb.conf");
f = fopen(smb_conf, "w");
if (!f) {
slirp_smb_cleanup(s);
error_setg(errp,
"Could not create samba server configuration file '%s'",
smb_conf);
g_free(smb_conf);
return -1;
}
fprintf(f,
"[global]\n"
"private dir=%s\n"
"interfaces=127.0.0.1\n"
"bind interfaces only=yes\n"
"pid directory=%s\n"
"lock directory=%s\n"
"state directory=%s\n"
"cache directory=%s\n"
"ncalrpc dir=%s/ncalrpc\n"
"log file=%s/log.smbd\n"
"smb passwd file=%s/smbpasswd\n"
"security = user\n"
"map to guest = Bad User\n"
"load printers = no\n"
"printing = bsd\n"
"disable spoolss = yes\n"
"usershare max shares = 0\n"
"[qemu]\n"
"path=%s\n"
"read only=no\n"
"guest ok=yes\n"
"force user=%s\n",
s->smb_dir,
s->smb_dir,
s->smb_dir,
s->smb_dir,
s->smb_dir,
s->smb_dir,
s->smb_dir,
s->smb_dir,
exported_dir,
passwd->pw_name
);
fclose(f);
smb_cmdline = g_strdup_printf("%s -l %s -s %s",
CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf);
g_free(smb_conf);
if (slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 139) < 0 ||
slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 445) < 0) {
slirp_smb_cleanup(s);
g_free(smb_cmdline);
error_setg(errp, "Conflicting/invalid smbserver address");
return -1;
}
g_free(smb_cmdline);
return 0;
}
#endif /* defined(CONFIG_SLIRP_SMBD) */
static int guestfwd_can_read(void *opaque)
{
struct GuestFwd *fwd = opaque;
return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port);
}
static void guestfwd_read(void *opaque, const uint8_t *buf, int size)
{
struct GuestFwd *fwd = opaque;
slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size);
}
static ssize_t guestfwd_write(const void *buf, size_t len, void *chr)
{
return qemu_chr_fe_write_all(chr, buf, len);
}
static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp)
{
/* TODO: IPv6 */
struct in_addr server = { .s_addr = 0 };
struct GuestFwd *fwd;
const char *p;
char buf[128];
char *end;
int port;
p = config_str;
if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
goto fail_syntax;
}
if (strcmp(buf, "tcp") && buf[0] != '\0') {
goto fail_syntax;
}
if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
goto fail_syntax;
}
if (buf[0] != '\0' && !inet_aton(buf, &server)) {
goto fail_syntax;
}
if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
goto fail_syntax;
}
port = strtol(buf, &end, 10);
if (*end != '\0' || port < 1 || port > 65535) {
goto fail_syntax;
}
snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port);
if (g_str_has_prefix(p, "cmd:")) {
if (slirp_add_exec(s->slirp, &p[4], &server, port) < 0) {
error_setg(errp, "Conflicting/invalid host:port in guest "
"forwarding rule '%s'", config_str);
return -1;
}
} else {
Error *err = NULL;
/*
* FIXME: sure we want to support implicit
* muxed monitors here?
*/
Chardev *chr = qemu_chr_new_mux_mon(buf, p, NULL);
if (!chr) {
error_setg(errp, "Could not open guest forwarding device '%s'",
buf);
return -1;
}
fwd = g_new(struct GuestFwd, 1);
qemu_chr_fe_init(&fwd->hd, chr, &err);
if (err) {
error_propagate(errp, err);
object_unparent(OBJECT(chr));
g_free(fwd);
return -1;
}
if (slirp_add_guestfwd(s->slirp, guestfwd_write, &fwd->hd,
&server, port) < 0) {
error_setg(errp, "Conflicting/invalid host:port in guest "
"forwarding rule '%s'", config_str);
qemu_chr_fe_deinit(&fwd->hd, true);
g_free(fwd);
return -1;
}