Merge remote-tracking branch 'remotes/pmaydell/tags/pull-target-arm-20210119-1' into...
[qemu.git] / net / slirp.c
1 /*
2 * QEMU System Emulator
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25 #include "qemu/osdep.h"
26 #include "qemu/log.h"
27 #include "net/slirp.h"
28
29
30 #ifndef _WIN32
31 #include <pwd.h>
32 #include <sys/wait.h>
33 #endif
34 #include "net/net.h"
35 #include "clients.h"
36 #include "hub.h"
37 #include "monitor/monitor.h"
38 #include "qemu/error-report.h"
39 #include "qemu/sockets.h"
40 #include <libslirp.h>
41 #include "chardev/char-fe.h"
42 #include "sysemu/sysemu.h"
43 #include "qemu/cutils.h"
44 #include "qapi/error.h"
45 #include "qapi/qmp/qdict.h"
46 #include "util.h"
47 #include "migration/register.h"
48 #include "migration/qemu-file-types.h"
49
50 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
51 {
52 const char *p, *p1;
53 int len;
54 p = *pp;
55 p1 = strchr(p, sep);
56 if (!p1)
57 return -1;
58 len = p1 - p;
59 p1++;
60 if (buf_size > 0) {
61 if (len > buf_size - 1)
62 len = buf_size - 1;
63 memcpy(buf, p, len);
64 buf[len] = '\0';
65 }
66 *pp = p1;
67 return 0;
68 }
69
70 /* slirp network adapter */
71
72 #define SLIRP_CFG_HOSTFWD 1
73
74 struct slirp_config_str {
75 struct slirp_config_str *next;
76 int flags;
77 char str[1024];
78 };
79
80 struct GuestFwd {
81 CharBackend hd;
82 struct in_addr server;
83 int port;
84 Slirp *slirp;
85 };
86
87 typedef struct SlirpState {
88 NetClientState nc;
89 QTAILQ_ENTRY(SlirpState) entry;
90 Slirp *slirp;
91 Notifier poll_notifier;
92 Notifier exit_notifier;
93 #ifndef _WIN32
94 gchar *smb_dir;
95 #endif
96 GSList *fwd;
97 } SlirpState;
98
99 static struct slirp_config_str *slirp_configs;
100 static QTAILQ_HEAD(, SlirpState) slirp_stacks =
101 QTAILQ_HEAD_INITIALIZER(slirp_stacks);
102
103 static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp);
104 static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp);
105
106 #ifndef _WIN32
107 static int slirp_smb(SlirpState *s, const char *exported_dir,
108 struct in_addr vserver_addr, Error **errp);
109 static void slirp_smb_cleanup(SlirpState *s);
110 #else
111 static inline void slirp_smb_cleanup(SlirpState *s) { }
112 #endif
113
114 static ssize_t net_slirp_send_packet(const void *pkt, size_t pkt_len,
115 void *opaque)
116 {
117 SlirpState *s = opaque;
118
119 return qemu_send_packet(&s->nc, pkt, pkt_len);
120 }
121
122 static ssize_t net_slirp_receive(NetClientState *nc, const uint8_t *buf, size_t size)
123 {
124 SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
125
126 slirp_input(s->slirp, buf, size);
127
128 return size;
129 }
130
131 static void slirp_smb_exit(Notifier *n, void *data)
132 {
133 SlirpState *s = container_of(n, SlirpState, exit_notifier);
134 slirp_smb_cleanup(s);
135 }
136
137 static void slirp_free_fwd(gpointer data)
138 {
139 struct GuestFwd *fwd = data;
140
141 qemu_chr_fe_deinit(&fwd->hd, true);
142 g_free(data);
143 }
144
145 static void net_slirp_cleanup(NetClientState *nc)
146 {
147 SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
148
149 g_slist_free_full(s->fwd, slirp_free_fwd);
150 main_loop_poll_remove_notifier(&s->poll_notifier);
151 unregister_savevm(NULL, "slirp", s->slirp);
152 slirp_cleanup(s->slirp);
153 if (s->exit_notifier.notify) {
154 qemu_remove_exit_notifier(&s->exit_notifier);
155 }
156 slirp_smb_cleanup(s);
157 QTAILQ_REMOVE(&slirp_stacks, s, entry);
158 }
159
160 static NetClientInfo net_slirp_info = {
161 .type = NET_CLIENT_DRIVER_USER,
162 .size = sizeof(SlirpState),
163 .receive = net_slirp_receive,
164 .cleanup = net_slirp_cleanup,
165 };
166
167 static void net_slirp_guest_error(const char *msg, void *opaque)
168 {
169 qemu_log_mask(LOG_GUEST_ERROR, "%s", msg);
170 }
171
172 static int64_t net_slirp_clock_get_ns(void *opaque)
173 {
174 return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
175 }
176
177 static void *net_slirp_timer_new(SlirpTimerCb cb,
178 void *cb_opaque, void *opaque)
179 {
180 return timer_new_full(NULL, QEMU_CLOCK_VIRTUAL,
181 SCALE_MS, QEMU_TIMER_ATTR_EXTERNAL,
182 cb, cb_opaque);
183 }
184
185 static void net_slirp_timer_free(void *timer, void *opaque)
186 {
187 timer_free(timer);
188 }
189
190 static void net_slirp_timer_mod(void *timer, int64_t expire_timer,
191 void *opaque)
192 {
193 timer_mod(timer, expire_timer);
194 }
195
196 static void net_slirp_register_poll_fd(int fd, void *opaque)
197 {
198 qemu_fd_register(fd);
199 }
200
201 static void net_slirp_unregister_poll_fd(int fd, void *opaque)
202 {
203 /* no qemu_fd_unregister */
204 }
205
206 static void net_slirp_notify(void *opaque)
207 {
208 qemu_notify_event();
209 }
210
211 static const SlirpCb slirp_cb = {
212 .send_packet = net_slirp_send_packet,
213 .guest_error = net_slirp_guest_error,
214 .clock_get_ns = net_slirp_clock_get_ns,
215 .timer_new = net_slirp_timer_new,
216 .timer_free = net_slirp_timer_free,
217 .timer_mod = net_slirp_timer_mod,
218 .register_poll_fd = net_slirp_register_poll_fd,
219 .unregister_poll_fd = net_slirp_unregister_poll_fd,
220 .notify = net_slirp_notify,
221 };
222
223 static int slirp_poll_to_gio(int events)
224 {
225 int ret = 0;
226
227 if (events & SLIRP_POLL_IN) {
228 ret |= G_IO_IN;
229 }
230 if (events & SLIRP_POLL_OUT) {
231 ret |= G_IO_OUT;
232 }
233 if (events & SLIRP_POLL_PRI) {
234 ret |= G_IO_PRI;
235 }
236 if (events & SLIRP_POLL_ERR) {
237 ret |= G_IO_ERR;
238 }
239 if (events & SLIRP_POLL_HUP) {
240 ret |= G_IO_HUP;
241 }
242
243 return ret;
244 }
245
246 static int net_slirp_add_poll(int fd, int events, void *opaque)
247 {
248 GArray *pollfds = opaque;
249 GPollFD pfd = {
250 .fd = fd,
251 .events = slirp_poll_to_gio(events),
252 };
253 int idx = pollfds->len;
254 g_array_append_val(pollfds, pfd);
255 return idx;
256 }
257
258 static int slirp_gio_to_poll(int events)
259 {
260 int ret = 0;
261
262 if (events & G_IO_IN) {
263 ret |= SLIRP_POLL_IN;
264 }
265 if (events & G_IO_OUT) {
266 ret |= SLIRP_POLL_OUT;
267 }
268 if (events & G_IO_PRI) {
269 ret |= SLIRP_POLL_PRI;
270 }
271 if (events & G_IO_ERR) {
272 ret |= SLIRP_POLL_ERR;
273 }
274 if (events & G_IO_HUP) {
275 ret |= SLIRP_POLL_HUP;
276 }
277
278 return ret;
279 }
280
281 static int net_slirp_get_revents(int idx, void *opaque)
282 {
283 GArray *pollfds = opaque;
284
285 return slirp_gio_to_poll(g_array_index(pollfds, GPollFD, idx).revents);
286 }
287
288 static void net_slirp_poll_notify(Notifier *notifier, void *data)
289 {
290 MainLoopPoll *poll = data;
291 SlirpState *s = container_of(notifier, SlirpState, poll_notifier);
292
293 switch (poll->state) {
294 case MAIN_LOOP_POLL_FILL:
295 slirp_pollfds_fill(s->slirp, &poll->timeout,
296 net_slirp_add_poll, poll->pollfds);
297 break;
298 case MAIN_LOOP_POLL_OK:
299 case MAIN_LOOP_POLL_ERR:
300 slirp_pollfds_poll(s->slirp, poll->state == MAIN_LOOP_POLL_ERR,
301 net_slirp_get_revents, poll->pollfds);
302 break;
303 default:
304 g_assert_not_reached();
305 }
306 }
307
308 static ssize_t
309 net_slirp_stream_read(void *buf, size_t size, void *opaque)
310 {
311 QEMUFile *f = opaque;
312
313 return qemu_get_buffer(f, buf, size);
314 }
315
316 static ssize_t
317 net_slirp_stream_write(const void *buf, size_t size, void *opaque)
318 {
319 QEMUFile *f = opaque;
320
321 qemu_put_buffer(f, buf, size);
322 if (qemu_file_get_error(f)) {
323 return -1;
324 }
325
326 return size;
327 }
328
329 static int net_slirp_state_load(QEMUFile *f, void *opaque, int version_id)
330 {
331 Slirp *slirp = opaque;
332
333 return slirp_state_load(slirp, version_id, net_slirp_stream_read, f);
334 }
335
336 static void net_slirp_state_save(QEMUFile *f, void *opaque)
337 {
338 Slirp *slirp = opaque;
339
340 slirp_state_save(slirp, net_slirp_stream_write, f);
341 }
342
343 static SaveVMHandlers savevm_slirp_state = {
344 .save_state = net_slirp_state_save,
345 .load_state = net_slirp_state_load,
346 };
347
348 static int net_slirp_init(NetClientState *peer, const char *model,
349 const char *name, int restricted,
350 bool ipv4, const char *vnetwork, const char *vhost,
351 bool ipv6, const char *vprefix6, int vprefix6_len,
352 const char *vhost6,
353 const char *vhostname, const char *tftp_export,
354 const char *bootfile, const char *vdhcp_start,
355 const char *vnameserver, const char *vnameserver6,
356 const char *smb_export, const char *vsmbserver,
357 const char **dnssearch, const char *vdomainname,
358 const char *tftp_server_name,
359 Error **errp)
360 {
361 /* default settings according to historic slirp */
362 struct in_addr net = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */
363 struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */
364 struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */
365 struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */
366 struct in_addr dns = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */
367 struct in6_addr ip6_prefix;
368 struct in6_addr ip6_host;
369 struct in6_addr ip6_dns;
370 #ifndef _WIN32
371 struct in_addr smbsrv = { .s_addr = 0 };
372 #endif
373 NetClientState *nc;
374 SlirpState *s;
375 char buf[20];
376 uint32_t addr;
377 int shift;
378 char *end;
379 struct slirp_config_str *config;
380
381 if (!ipv4 && (vnetwork || vhost || vnameserver)) {
382 error_setg(errp, "IPv4 disabled but netmask/host/dns provided");
383 return -1;
384 }
385
386 if (!ipv6 && (vprefix6 || vhost6 || vnameserver6)) {
387 error_setg(errp, "IPv6 disabled but prefix/host6/dns6 provided");
388 return -1;
389 }
390
391 if (!ipv4 && !ipv6) {
392 /* It doesn't make sense to disable both */
393 error_setg(errp, "IPv4 and IPv6 disabled");
394 return -1;
395 }
396
397 if (vnetwork) {
398 if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) {
399 if (!inet_aton(vnetwork, &net)) {
400 error_setg(errp, "Failed to parse netmask");
401 return -1;
402 }
403 addr = ntohl(net.s_addr);
404 if (!(addr & 0x80000000)) {
405 mask.s_addr = htonl(0xff000000); /* class A */
406 } else if ((addr & 0xfff00000) == 0xac100000) {
407 mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */
408 } else if ((addr & 0xc0000000) == 0x80000000) {
409 mask.s_addr = htonl(0xffff0000); /* class B */
410 } else if ((addr & 0xffff0000) == 0xc0a80000) {
411 mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */
412 } else if ((addr & 0xffff0000) == 0xc6120000) {
413 mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */
414 } else if ((addr & 0xe0000000) == 0xe0000000) {
415 mask.s_addr = htonl(0xffffff00); /* class C */
416 } else {
417 mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */
418 }
419 } else {
420 if (!inet_aton(buf, &net)) {
421 error_setg(errp, "Failed to parse netmask");
422 return -1;
423 }
424 shift = strtol(vnetwork, &end, 10);
425 if (*end != '\0') {
426 if (!inet_aton(vnetwork, &mask)) {
427 error_setg(errp,
428 "Failed to parse netmask (trailing chars)");
429 return -1;
430 }
431 } else if (shift < 4 || shift > 32) {
432 error_setg(errp,
433 "Invalid netmask provided (must be in range 4-32)");
434 return -1;
435 } else {
436 mask.s_addr = htonl(0xffffffff << (32 - shift));
437 }
438 }
439 net.s_addr &= mask.s_addr;
440 host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr);
441 dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr);
442 dns.s_addr = net.s_addr | (htonl(0x0203) & ~mask.s_addr);
443 }
444
445 if (vhost && !inet_aton(vhost, &host)) {
446 error_setg(errp, "Failed to parse host");
447 return -1;
448 }
449 if ((host.s_addr & mask.s_addr) != net.s_addr) {
450 error_setg(errp, "Host doesn't belong to network");
451 return -1;
452 }
453
454 if (vnameserver && !inet_aton(vnameserver, &dns)) {
455 error_setg(errp, "Failed to parse DNS");
456 return -1;
457 }
458 if (restricted && (dns.s_addr & mask.s_addr) != net.s_addr) {
459 error_setg(errp, "DNS doesn't belong to network");
460 return -1;
461 }
462 if (dns.s_addr == host.s_addr) {
463 error_setg(errp, "DNS must be different from host");
464 return -1;
465 }
466
467 if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) {
468 error_setg(errp, "Failed to parse DHCP start address");
469 return -1;
470 }
471 if ((dhcp.s_addr & mask.s_addr) != net.s_addr) {
472 error_setg(errp, "DHCP doesn't belong to network");
473 return -1;
474 }
475 if (dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) {
476 error_setg(errp, "DNS must be different from host and DNS");
477 return -1;
478 }
479
480 #ifndef _WIN32
481 if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) {
482 error_setg(errp, "Failed to parse SMB address");
483 return -1;
484 }
485 #endif
486
487 if (!vprefix6) {
488 vprefix6 = "fec0::";
489 }
490 if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) {
491 error_setg(errp, "Failed to parse IPv6 prefix");
492 return -1;
493 }
494
495 if (!vprefix6_len) {
496 vprefix6_len = 64;
497 }
498 if (vprefix6_len < 0 || vprefix6_len > 126) {
499 error_setg(errp,
500 "Invalid IPv6 prefix provided "
501 "(IPv6 prefix length must be between 0 and 126)");
502 return -1;
503 }
504
505 if (vhost6) {
506 if (!inet_pton(AF_INET6, vhost6, &ip6_host)) {
507 error_setg(errp, "Failed to parse IPv6 host");
508 return -1;
509 }
510 if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) {
511 error_setg(errp, "IPv6 Host doesn't belong to network");
512 return -1;
513 }
514 } else {
515 ip6_host = ip6_prefix;
516 ip6_host.s6_addr[15] |= 2;
517 }
518
519 if (vnameserver6) {
520 if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) {
521 error_setg(errp, "Failed to parse IPv6 DNS");
522 return -1;
523 }
524 if (restricted && !in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) {
525 error_setg(errp, "IPv6 DNS doesn't belong to network");
526 return -1;
527 }
528 } else {
529 ip6_dns = ip6_prefix;
530 ip6_dns.s6_addr[15] |= 3;
531 }
532
533 if (vdomainname && !*vdomainname) {
534 error_setg(errp, "'domainname' parameter cannot be empty");
535 return -1;
536 }
537
538 if (vdomainname && strlen(vdomainname) > 255) {
539 error_setg(errp, "'domainname' parameter cannot exceed 255 bytes");
540 return -1;
541 }
542
543 if (vhostname && strlen(vhostname) > 255) {
544 error_setg(errp, "'vhostname' parameter cannot exceed 255 bytes");
545 return -1;
546 }
547
548 if (tftp_server_name && strlen(tftp_server_name) > 255) {
549 error_setg(errp, "'tftp-server-name' parameter cannot exceed 255 bytes");
550 return -1;
551 }
552
553 nc = qemu_new_net_client(&net_slirp_info, peer, model, name);
554
555 snprintf(nc->info_str, sizeof(nc->info_str),
556 "net=%s,restrict=%s", inet_ntoa(net),
557 restricted ? "on" : "off");
558
559 s = DO_UPCAST(SlirpState, nc, nc);
560
561 s->slirp = slirp_init(restricted, ipv4, net, mask, host,
562 ipv6, ip6_prefix, vprefix6_len, ip6_host,
563 vhostname, tftp_server_name,
564 tftp_export, bootfile, dhcp,
565 dns, ip6_dns, dnssearch, vdomainname,
566 &slirp_cb, s);
567 QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry);
568
569 /*
570 * Make sure the current bitstream version of slirp is 4, to avoid
571 * QEMU migration incompatibilities, if upstream slirp bumped the
572 * version.
573 *
574 * FIXME: use bitfields of features? teach libslirp to save with
575 * specific version?
576 */
577 g_assert(slirp_state_version() == 4);
578 register_savevm_live("slirp", 0, slirp_state_version(),
579 &savevm_slirp_state, s->slirp);
580
581 s->poll_notifier.notify = net_slirp_poll_notify;
582 main_loop_poll_add_notifier(&s->poll_notifier);
583
584 for (config = slirp_configs; config; config = config->next) {
585 if (config->flags & SLIRP_CFG_HOSTFWD) {
586 if (slirp_hostfwd(s, config->str, errp) < 0) {
587 goto error;
588 }
589 } else {
590 if (slirp_guestfwd(s, config->str, errp) < 0) {
591 goto error;
592 }
593 }
594 }
595 #ifndef _WIN32
596 if (smb_export) {
597 if (slirp_smb(s, smb_export, smbsrv, errp) < 0) {
598 goto error;
599 }
600 }
601 #endif
602
603 s->exit_notifier.notify = slirp_smb_exit;
604 qemu_add_exit_notifier(&s->exit_notifier);
605 return 0;
606
607 error:
608 qemu_del_net_client(nc);
609 return -1;
610 }
611
612 static SlirpState *slirp_lookup(Monitor *mon, const char *id)
613 {
614 if (id) {
615 NetClientState *nc = qemu_find_netdev(id);
616 if (!nc) {
617 monitor_printf(mon, "unrecognized netdev id '%s'\n", id);
618 return NULL;
619 }
620 if (strcmp(nc->model, "user")) {
621 monitor_printf(mon, "invalid device specified\n");
622 return NULL;
623 }
624 return DO_UPCAST(SlirpState, nc, nc);
625 } else {
626 if (QTAILQ_EMPTY(&slirp_stacks)) {
627 monitor_printf(mon, "user mode network stack not in use\n");
628 return NULL;
629 }
630 return QTAILQ_FIRST(&slirp_stacks);
631 }
632 }
633
634 void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict)
635 {
636 struct in_addr host_addr = { .s_addr = INADDR_ANY };
637 int host_port;
638 char buf[256];
639 const char *src_str, *p;
640 SlirpState *s;
641 int is_udp = 0;
642 int err;
643 const char *arg1 = qdict_get_str(qdict, "arg1");
644 const char *arg2 = qdict_get_try_str(qdict, "arg2");
645
646 if (arg2) {
647 s = slirp_lookup(mon, arg1);
648 src_str = arg2;
649 } else {
650 s = slirp_lookup(mon, NULL);
651 src_str = arg1;
652 }
653 if (!s) {
654 return;
655 }
656
657 p = src_str;
658 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
659 goto fail_syntax;
660 }
661
662 if (!strcmp(buf, "tcp") || buf[0] == '\0') {
663 is_udp = 0;
664 } else if (!strcmp(buf, "udp")) {
665 is_udp = 1;
666 } else {
667 goto fail_syntax;
668 }
669
670 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
671 goto fail_syntax;
672 }
673 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
674 goto fail_syntax;
675 }
676
677 if (qemu_strtoi(p, NULL, 10, &host_port)) {
678 goto fail_syntax;
679 }
680
681 err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port);
682
683 monitor_printf(mon, "host forwarding rule for %s %s\n", src_str,
684 err ? "not found" : "removed");
685 return;
686
687 fail_syntax:
688 monitor_printf(mon, "invalid format\n");
689 }
690
691 static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp)
692 {
693 struct in_addr host_addr = { .s_addr = INADDR_ANY };
694 struct in_addr guest_addr = { .s_addr = 0 };
695 int host_port, guest_port;
696 const char *p;
697 char buf[256];
698 int is_udp;
699 char *end;
700 const char *fail_reason = "Unknown reason";
701
702 p = redir_str;
703 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
704 fail_reason = "No : separators";
705 goto fail_syntax;
706 }
707 if (!strcmp(buf, "tcp") || buf[0] == '\0') {
708 is_udp = 0;
709 } else if (!strcmp(buf, "udp")) {
710 is_udp = 1;
711 } else {
712 fail_reason = "Bad protocol name";
713 goto fail_syntax;
714 }
715
716 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
717 fail_reason = "Missing : separator";
718 goto fail_syntax;
719 }
720 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
721 fail_reason = "Bad host address";
722 goto fail_syntax;
723 }
724
725 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
726 fail_reason = "Bad host port separator";
727 goto fail_syntax;
728 }
729 host_port = strtol(buf, &end, 0);
730 if (*end != '\0' || host_port < 0 || host_port > 65535) {
731 fail_reason = "Bad host port";
732 goto fail_syntax;
733 }
734
735 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
736 fail_reason = "Missing guest address";
737 goto fail_syntax;
738 }
739 if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) {
740 fail_reason = "Bad guest address";
741 goto fail_syntax;
742 }
743
744 guest_port = strtol(p, &end, 0);
745 if (*end != '\0' || guest_port < 1 || guest_port > 65535) {
746 fail_reason = "Bad guest port";
747 goto fail_syntax;
748 }
749
750 if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr,
751 guest_port) < 0) {
752 error_setg(errp, "Could not set up host forwarding rule '%s'",
753 redir_str);
754 return -1;
755 }
756 return 0;
757
758 fail_syntax:
759 error_setg(errp, "Invalid host forwarding rule '%s' (%s)", redir_str,
760 fail_reason);
761 return -1;
762 }
763
764 void hmp_hostfwd_add(Monitor *mon, const QDict *qdict)
765 {
766 const char *redir_str;
767 SlirpState *s;
768 const char *arg1 = qdict_get_str(qdict, "arg1");
769 const char *arg2 = qdict_get_try_str(qdict, "arg2");
770
771 if (arg2) {
772 s = slirp_lookup(mon, arg1);
773 redir_str = arg2;
774 } else {
775 s = slirp_lookup(mon, NULL);
776 redir_str = arg1;
777 }
778 if (s) {
779 Error *err = NULL;
780 if (slirp_hostfwd(s, redir_str, &err) < 0) {
781 error_report_err(err);
782 }
783 }
784
785 }
786
787 #ifndef _WIN32
788
789 /* automatic user mode samba server configuration */
790 static void slirp_smb_cleanup(SlirpState *s)
791 {
792 int ret;
793
794 if (s->smb_dir) {
795 gchar *cmd = g_strdup_printf("rm -rf %s", s->smb_dir);
796 ret = system(cmd);
797 if (ret == -1 || !WIFEXITED(ret)) {
798 error_report("'%s' failed.", cmd);
799 } else if (WEXITSTATUS(ret)) {
800 error_report("'%s' failed. Error code: %d",
801 cmd, WEXITSTATUS(ret));
802 }
803 g_free(cmd);
804 g_free(s->smb_dir);
805 s->smb_dir = NULL;
806 }
807 }
808
809 static int slirp_smb(SlirpState* s, const char *exported_dir,
810 struct in_addr vserver_addr, Error **errp)
811 {
812 char *smb_conf;
813 char *smb_cmdline;
814 struct passwd *passwd;
815 FILE *f;
816
817 passwd = getpwuid(geteuid());
818 if (!passwd) {
819 error_setg(errp, "Failed to retrieve user name");
820 return -1;
821 }
822
823 if (access(CONFIG_SMBD_COMMAND, F_OK)) {
824 error_setg(errp, "Could not find '%s', please install it",
825 CONFIG_SMBD_COMMAND);
826 return -1;
827 }
828
829 if (access(exported_dir, R_OK | X_OK)) {
830 error_setg(errp, "Error accessing shared directory '%s': %s",
831 exported_dir, strerror(errno));
832 return -1;
833 }
834
835 s->smb_dir = g_dir_make_tmp("qemu-smb.XXXXXX", NULL);
836 if (!s->smb_dir) {
837 error_setg(errp, "Could not create samba server dir");
838 return -1;
839 }
840 smb_conf = g_strdup_printf("%s/%s", s->smb_dir, "smb.conf");
841
842 f = fopen(smb_conf, "w");
843 if (!f) {
844 slirp_smb_cleanup(s);
845 error_setg(errp,
846 "Could not create samba server configuration file '%s'",
847 smb_conf);
848 g_free(smb_conf);
849 return -1;
850 }
851 fprintf(f,
852 "[global]\n"
853 "private dir=%s\n"
854 "interfaces=127.0.0.1\n"
855 "bind interfaces only=yes\n"
856 "pid directory=%s\n"
857 "lock directory=%s\n"
858 "state directory=%s\n"
859 "cache directory=%s\n"
860 "ncalrpc dir=%s/ncalrpc\n"
861 "log file=%s/log.smbd\n"
862 "smb passwd file=%s/smbpasswd\n"
863 "security = user\n"
864 "map to guest = Bad User\n"
865 "load printers = no\n"
866 "printing = bsd\n"
867 "disable spoolss = yes\n"
868 "usershare max shares = 0\n"
869 "[qemu]\n"
870 "path=%s\n"
871 "read only=no\n"
872 "guest ok=yes\n"
873 "force user=%s\n",
874 s->smb_dir,
875 s->smb_dir,
876 s->smb_dir,
877 s->smb_dir,
878 s->smb_dir,
879 s->smb_dir,
880 s->smb_dir,
881 s->smb_dir,
882 exported_dir,
883 passwd->pw_name
884 );
885 fclose(f);
886
887 smb_cmdline = g_strdup_printf("%s -l %s -s %s",
888 CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf);
889 g_free(smb_conf);
890
891 if (slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 139) < 0 ||
892 slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 445) < 0) {
893 slirp_smb_cleanup(s);
894 g_free(smb_cmdline);
895 error_setg(errp, "Conflicting/invalid smbserver address");
896 return -1;
897 }
898 g_free(smb_cmdline);
899 return 0;
900 }
901
902 #endif /* !defined(_WIN32) */
903
904 static int guestfwd_can_read(void *opaque)
905 {
906 struct GuestFwd *fwd = opaque;
907 return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port);
908 }
909
910 static void guestfwd_read(void *opaque, const uint8_t *buf, int size)
911 {
912 struct GuestFwd *fwd = opaque;
913 slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size);
914 }
915
916 static ssize_t guestfwd_write(const void *buf, size_t len, void *chr)
917 {
918 return qemu_chr_fe_write_all(chr, buf, len);
919 }
920
921 static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp)
922 {
923 /* TODO: IPv6 */
924 struct in_addr server = { .s_addr = 0 };
925 struct GuestFwd *fwd;
926 const char *p;
927 char buf[128];
928 char *end;
929 int port;
930
931 p = config_str;
932 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
933 goto fail_syntax;
934 }
935 if (strcmp(buf, "tcp") && buf[0] != '\0') {
936 goto fail_syntax;
937 }
938 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
939 goto fail_syntax;
940 }
941 if (buf[0] != '\0' && !inet_aton(buf, &server)) {
942 goto fail_syntax;
943 }
944 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
945 goto fail_syntax;
946 }
947 port = strtol(buf, &end, 10);
948 if (*end != '\0' || port < 1 || port > 65535) {
949 goto fail_syntax;
950 }
951
952 snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port);
953
954 if (g_str_has_prefix(p, "cmd:")) {
955 if (slirp_add_exec(s->slirp, &p[4], &server, port) < 0) {
956 error_setg(errp, "Conflicting/invalid host:port in guest "
957 "forwarding rule '%s'", config_str);
958 return -1;
959 }
960 } else {
961 Error *err = NULL;
962 /*
963 * FIXME: sure we want to support implicit
964 * muxed monitors here?
965 */
966 Chardev *chr = qemu_chr_new_mux_mon(buf, p, NULL);
967
968 if (!chr) {
969 error_setg(errp, "Could not open guest forwarding device '%s'",
970 buf);
971 return -1;
972 }
973
974 fwd = g_new(struct GuestFwd, 1);
975 qemu_chr_fe_init(&fwd->hd, chr, &err);
976 if (err) {
977 error_propagate(errp, err);
978 object_unparent(OBJECT(chr));
979 g_free(fwd);
980 return -1;
981 }
982
983 if (slirp_add_guestfwd(s->slirp, guestfwd_write, &fwd->hd,
984 &server, port) < 0) {
985 error_setg(errp, "Conflicting/invalid host:port in guest "
986 "forwarding rule '%s'", config_str);
987 qemu_chr_fe_deinit(&fwd->hd, true);
988 g_free(fwd);
989 return -1;
990 }
991 fwd->server = server;
992 fwd->port = port;
993 fwd->slirp = s->slirp;
994
995 qemu_chr_fe_set_handlers(&fwd->hd, guestfwd_can_read, guestfwd_read,
996 NULL, NULL, fwd, NULL, true);
997 s->fwd = g_slist_append(s->fwd, fwd);
998 }
999 return 0;
1000
1001 fail_syntax:
1002 error_setg(errp, "Invalid guest forwarding rule '%s'", config_str);
1003 return -1;
1004 }
1005
1006 void hmp_info_usernet(Monitor *mon, const QDict *qdict)
1007 {
1008 SlirpState *s;
1009
1010 QTAILQ_FOREACH(s, &slirp_stacks, entry) {
1011 int id;
1012 bool got_hub_id = net_hub_id_for_client(&s->nc, &id) == 0;
1013 char *info = slirp_connection_info(s->slirp);
1014 monitor_printf(mon, "Hub %d (%s):\n%s",
1015 got_hub_id ? id : -1,
1016 s->nc.name, info);
1017 g_free(info);
1018 }
1019 }
1020
1021 static void
1022 net_init_slirp_configs(const StringList *fwd, int flags)
1023 {
1024 while (fwd) {
1025 struct slirp_config_str *config;
1026
1027 config = g_malloc0(sizeof(*config));
1028 pstrcpy(config->str, sizeof(config->str), fwd->value->str);
1029 config->flags = flags;
1030 config->next = slirp_configs;
1031 slirp_configs = config;
1032
1033 fwd = fwd->next;
1034 }
1035 }
1036
1037 static const char **slirp_dnssearch(const StringList *dnsname)
1038 {
1039 const StringList *c = dnsname;
1040 size_t i = 0, num_opts = 0;
1041 const char **ret;
1042
1043 while (c) {
1044 num_opts++;
1045 c = c->next;
1046 }
1047
1048 if (num_opts == 0) {
1049 return NULL;
1050 }
1051
1052 ret = g_malloc((num_opts + 1) * sizeof(*ret));
1053 c = dnsname;
1054 while (c) {
1055 ret[i++] = c->value->str;
1056 c = c->next;
1057 }
1058 ret[i] = NULL;
1059 return ret;
1060 }
1061
1062 int net_init_slirp(const Netdev *netdev, const char *name,
1063 NetClientState *peer, Error **errp)
1064 {
1065 struct slirp_config_str *config;
1066 char *vnet;
1067 int ret;
1068 const NetdevUserOptions *user;
1069 const char **dnssearch;
1070 bool ipv4 = true, ipv6 = true;
1071
1072 assert(netdev->type == NET_CLIENT_DRIVER_USER);
1073 user = &netdev->u.user;
1074
1075 if ((user->has_ipv6 && user->ipv6 && !user->has_ipv4) ||
1076 (user->has_ipv4 && !user->ipv4)) {
1077 ipv4 = 0;
1078 }
1079 if ((user->has_ipv4 && user->ipv4 && !user->has_ipv6) ||
1080 (user->has_ipv6 && !user->ipv6)) {
1081 ipv6 = 0;
1082 }
1083
1084 vnet = user->has_net ? g_strdup(user->net) :
1085 user->has_ip ? g_strdup_printf("%s/24", user->ip) :
1086 NULL;
1087
1088 dnssearch = slirp_dnssearch(user->dnssearch);
1089
1090 /* all optional fields are initialized to "all bits zero" */
1091
1092 net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD);
1093 net_init_slirp_configs(user->guestfwd, 0);
1094
1095 ret = net_slirp_init(peer, "user", name, user->q_restrict,
1096 ipv4, vnet, user->host,
1097 ipv6, user->ipv6_prefix, user->ipv6_prefixlen,
1098 user->ipv6_host, user->hostname, user->tftp,
1099 user->bootfile, user->dhcpstart,
1100 user->dns, user->ipv6_dns, user->smb,
1101 user->smbserver, dnssearch, user->domainname,
1102 user->tftp_server_name, errp);
1103
1104 while (slirp_configs) {
1105 config = slirp_configs;
1106 slirp_configs = config->next;
1107 g_free(config);
1108 }
1109
1110 g_free(vnet);
1111 g_free(dnssearch);
1112
1113 return ret;
1114 }