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25#include "qemu/osdep.h"
26#include "qemu/log.h"
27#include "net/slirp.h"
28
29
30#if defined(CONFIG_SLIRP_SMBD)
31#include <pwd.h>
32#include <sys/wait.h>
33#endif
34#include "net/eth.h"
35#include "net/net.h"
36#include "clients.h"
37#include "hub.h"
38#include "monitor/monitor.h"
39#include "qemu/error-report.h"
40#include "qemu/sockets.h"
41#include <libslirp.h>
42#include "chardev/char-fe.h"
43#include "sysemu/sysemu.h"
44#include "qemu/cutils.h"
45#include "qapi/error.h"
46#include "qapi/qmp/qdict.h"
47#include "util.h"
48#include "migration/register.h"
49#include "migration/qemu-file-types.h"
50
51static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
52{
53 const char *p, *p1;
54 int len;
55 p = *pp;
56 p1 = strchr(p, sep);
57 if (!p1)
58 return -1;
59 len = p1 - p;
60 p1++;
61 if (buf_size > 0) {
62 if (len > buf_size - 1)
63 len = buf_size - 1;
64 memcpy(buf, p, len);
65 buf[len] = '\0';
66 }
67 *pp = p1;
68 return 0;
69}
70
71
72
73#define SLIRP_CFG_HOSTFWD 1
74
75struct slirp_config_str {
76 struct slirp_config_str *next;
77 int flags;
78 char str[1024];
79};
80
81struct GuestFwd {
82 CharBackend hd;
83 struct in_addr server;
84 int port;
85 Slirp *slirp;
86};
87
88typedef struct SlirpState {
89 NetClientState nc;
90 QTAILQ_ENTRY(SlirpState) entry;
91 Slirp *slirp;
92 Notifier poll_notifier;
93 Notifier exit_notifier;
94#if defined(CONFIG_SLIRP_SMBD)
95 gchar *smb_dir;
96#endif
97 GSList *fwd;
98} SlirpState;
99
100static struct slirp_config_str *slirp_configs;
101static QTAILQ_HEAD(, SlirpState) slirp_stacks =
102 QTAILQ_HEAD_INITIALIZER(slirp_stacks);
103
104static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp);
105static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp);
106
107#if defined(CONFIG_SLIRP_SMBD)
108static int slirp_smb(SlirpState *s, const char *exported_dir,
109 struct in_addr vserver_addr, Error **errp);
110static void slirp_smb_cleanup(SlirpState *s);
111#else
112static inline void slirp_smb_cleanup(SlirpState *s) { }
113#endif
114
115static ssize_t net_slirp_send_packet(const void *pkt, size_t pkt_len,
116 void *opaque)
117{
118 SlirpState *s = opaque;
119 uint8_t min_pkt[ETH_ZLEN];
120 size_t min_pktsz = sizeof(min_pkt);
121
122 if (net_peer_needs_padding(&s->nc)) {
123 if (eth_pad_short_frame(min_pkt, &min_pktsz, pkt, pkt_len)) {
124 pkt = min_pkt;
125 pkt_len = min_pktsz;
126 }
127 }
128
129 return qemu_send_packet(&s->nc, pkt, pkt_len);
130}
131
132static ssize_t net_slirp_receive(NetClientState *nc, const uint8_t *buf, size_t size)
133{
134 SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
135
136 slirp_input(s->slirp, buf, size);
137
138 return size;
139}
140
141static void slirp_smb_exit(Notifier *n, void *data)
142{
143 SlirpState *s = container_of(n, SlirpState, exit_notifier);
144 slirp_smb_cleanup(s);
145}
146
147static void slirp_free_fwd(gpointer data)
148{
149 struct GuestFwd *fwd = data;
150
151 qemu_chr_fe_deinit(&fwd->hd, true);
152 g_free(data);
153}
154
155static void net_slirp_cleanup(NetClientState *nc)
156{
157 SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
158
159 g_slist_free_full(s->fwd, slirp_free_fwd);
160 main_loop_poll_remove_notifier(&s->poll_notifier);
161 unregister_savevm(NULL, "slirp", s->slirp);
162 slirp_cleanup(s->slirp);
163 if (s->exit_notifier.notify) {
164 qemu_remove_exit_notifier(&s->exit_notifier);
165 }
166 slirp_smb_cleanup(s);
167 QTAILQ_REMOVE(&slirp_stacks, s, entry);
168}
169
170static NetClientInfo net_slirp_info = {
171 .type = NET_CLIENT_DRIVER_USER,
172 .size = sizeof(SlirpState),
173 .receive = net_slirp_receive,
174 .cleanup = net_slirp_cleanup,
175};
176
177static void net_slirp_guest_error(const char *msg, void *opaque)
178{
179 qemu_log_mask(LOG_GUEST_ERROR, "%s", msg);
180}
181
182static int64_t net_slirp_clock_get_ns(void *opaque)
183{
184 return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
185}
186
187static void *net_slirp_timer_new(SlirpTimerCb cb,
188 void *cb_opaque, void *opaque)
189{
190 return timer_new_full(NULL, QEMU_CLOCK_VIRTUAL,
191 SCALE_MS, QEMU_TIMER_ATTR_EXTERNAL,
192 cb, cb_opaque);
193}
194
195static void net_slirp_timer_free(void *timer, void *opaque)
196{
197 timer_free(timer);
198}
199
200static void net_slirp_timer_mod(void *timer, int64_t expire_timer,
201 void *opaque)
202{
203 timer_mod(timer, expire_timer);
204}
205
206static void net_slirp_register_poll_fd(int fd, void *opaque)
207{
208 qemu_fd_register(fd);
209}
210
211static void net_slirp_unregister_poll_fd(int fd, void *opaque)
212{
213
214}
215
216static void net_slirp_notify(void *opaque)
217{
218 qemu_notify_event();
219}
220
221static const SlirpCb slirp_cb = {
222 .send_packet = net_slirp_send_packet,
223 .guest_error = net_slirp_guest_error,
224 .clock_get_ns = net_slirp_clock_get_ns,
225 .timer_new = net_slirp_timer_new,
226 .timer_free = net_slirp_timer_free,
227 .timer_mod = net_slirp_timer_mod,
228 .register_poll_fd = net_slirp_register_poll_fd,
229 .unregister_poll_fd = net_slirp_unregister_poll_fd,
230 .notify = net_slirp_notify,
231};
232
233static int slirp_poll_to_gio(int events)
234{
235 int ret = 0;
236
237 if (events & SLIRP_POLL_IN) {
238 ret |= G_IO_IN;
239 }
240 if (events & SLIRP_POLL_OUT) {
241 ret |= G_IO_OUT;
242 }
243 if (events & SLIRP_POLL_PRI) {
244 ret |= G_IO_PRI;
245 }
246 if (events & SLIRP_POLL_ERR) {
247 ret |= G_IO_ERR;
248 }
249 if (events & SLIRP_POLL_HUP) {
250 ret |= G_IO_HUP;
251 }
252
253 return ret;
254}
255
256static int net_slirp_add_poll(int fd, int events, void *opaque)
257{
258 GArray *pollfds = opaque;
259 GPollFD pfd = {
260 .fd = fd,
261 .events = slirp_poll_to_gio(events),
262 };
263 int idx = pollfds->len;
264 g_array_append_val(pollfds, pfd);
265 return idx;
266}
267
268static int slirp_gio_to_poll(int events)
269{
270 int ret = 0;
271
272 if (events & G_IO_IN) {
273 ret |= SLIRP_POLL_IN;
274 }
275 if (events & G_IO_OUT) {
276 ret |= SLIRP_POLL_OUT;
277 }
278 if (events & G_IO_PRI) {
279 ret |= SLIRP_POLL_PRI;
280 }
281 if (events & G_IO_ERR) {
282 ret |= SLIRP_POLL_ERR;
283 }
284 if (events & G_IO_HUP) {
285 ret |= SLIRP_POLL_HUP;
286 }
287
288 return ret;
289}
290
291static int net_slirp_get_revents(int idx, void *opaque)
292{
293 GArray *pollfds = opaque;
294
295 return slirp_gio_to_poll(g_array_index(pollfds, GPollFD, idx).revents);
296}
297
298static void net_slirp_poll_notify(Notifier *notifier, void *data)
299{
300 MainLoopPoll *poll = data;
301 SlirpState *s = container_of(notifier, SlirpState, poll_notifier);
302
303 switch (poll->state) {
304 case MAIN_LOOP_POLL_FILL:
305 slirp_pollfds_fill(s->slirp, &poll->timeout,
306 net_slirp_add_poll, poll->pollfds);
307 break;
308 case MAIN_LOOP_POLL_OK:
309 case MAIN_LOOP_POLL_ERR:
310 slirp_pollfds_poll(s->slirp, poll->state == MAIN_LOOP_POLL_ERR,
311 net_slirp_get_revents, poll->pollfds);
312 break;
313 default:
314 g_assert_not_reached();
315 }
316}
317
318static ssize_t
319net_slirp_stream_read(void *buf, size_t size, void *opaque)
320{
321 QEMUFile *f = opaque;
322
323 return qemu_get_buffer(f, buf, size);
324}
325
326static ssize_t
327net_slirp_stream_write(const void *buf, size_t size, void *opaque)
328{
329 QEMUFile *f = opaque;
330
331 qemu_put_buffer(f, buf, size);
332 if (qemu_file_get_error(f)) {
333 return -1;
334 }
335
336 return size;
337}
338
339static int net_slirp_state_load(QEMUFile *f, void *opaque, int version_id)
340{
341 Slirp *slirp = opaque;
342
343 return slirp_state_load(slirp, version_id, net_slirp_stream_read, f);
344}
345
346static void net_slirp_state_save(QEMUFile *f, void *opaque)
347{
348 Slirp *slirp = opaque;
349
350 slirp_state_save(slirp, net_slirp_stream_write, f);
351}
352
353static SaveVMHandlers savevm_slirp_state = {
354 .save_state = net_slirp_state_save,
355 .load_state = net_slirp_state_load,
356};
357
358static int net_slirp_init(NetClientState *peer, const char *model,
359 const char *name, int restricted,
360 bool ipv4, const char *vnetwork, const char *vhost,
361 bool ipv6, const char *vprefix6, int vprefix6_len,
362 const char *vhost6,
363 const char *vhostname, const char *tftp_export,
364 const char *bootfile, const char *vdhcp_start,
365 const char *vnameserver, const char *vnameserver6,
366 const char *smb_export, const char *vsmbserver,
367 const char **dnssearch, const char *vdomainname,
368 const char *tftp_server_name,
369 Error **errp)
370{
371
372 struct in_addr net = { .s_addr = htonl(0x0a000200) };
373 struct in_addr mask = { .s_addr = htonl(0xffffff00) };
374 struct in_addr host = { .s_addr = htonl(0x0a000202) };
375 struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) };
376 struct in_addr dns = { .s_addr = htonl(0x0a000203) };
377 struct in6_addr ip6_prefix;
378 struct in6_addr ip6_host;
379 struct in6_addr ip6_dns;
380#if defined(CONFIG_SLIRP_SMBD)
381 struct in_addr smbsrv = { .s_addr = 0 };
382#endif
383 NetClientState *nc;
384 SlirpState *s;
385 char buf[20];
386 uint32_t addr;
387 int shift;
388 char *end;
389 struct slirp_config_str *config;
390
391 if (!ipv4 && (vnetwork || vhost || vnameserver)) {
392 error_setg(errp, "IPv4 disabled but netmask/host/dns provided");
393 return -1;
394 }
395
396 if (!ipv6 && (vprefix6 || vhost6 || vnameserver6)) {
397 error_setg(errp, "IPv6 disabled but prefix/host6/dns6 provided");
398 return -1;
399 }
400
401 if (!ipv4 && !ipv6) {
402
403 error_setg(errp, "IPv4 and IPv6 disabled");
404 return -1;
405 }
406
407 if (vnetwork) {
408 if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) {
409 if (!inet_aton(vnetwork, &net)) {
410 error_setg(errp, "Failed to parse netmask");
411 return -1;
412 }
413 addr = ntohl(net.s_addr);
414 if (!(addr & 0x80000000)) {
415 mask.s_addr = htonl(0xff000000);
416 } else if ((addr & 0xfff00000) == 0xac100000) {
417 mask.s_addr = htonl(0xfff00000);
418 } else if ((addr & 0xc0000000) == 0x80000000) {
419 mask.s_addr = htonl(0xffff0000);
420 } else if ((addr & 0xffff0000) == 0xc0a80000) {
421 mask.s_addr = htonl(0xffff0000);
422 } else if ((addr & 0xffff0000) == 0xc6120000) {
423 mask.s_addr = htonl(0xfffe0000);
424 } else if ((addr & 0xe0000000) == 0xe0000000) {
425 mask.s_addr = htonl(0xffffff00);
426 } else {
427 mask.s_addr = htonl(0xfffffff0);
428 }
429 } else {
430 if (!inet_aton(buf, &net)) {
431 error_setg(errp, "Failed to parse netmask");
432 return -1;
433 }
434 shift = strtol(vnetwork, &end, 10);
435 if (*end != '\0') {
436 if (!inet_aton(vnetwork, &mask)) {
437 error_setg(errp,
438 "Failed to parse netmask (trailing chars)");
439 return -1;
440 }
441 } else if (shift < 4 || shift > 32) {
442 error_setg(errp,
443 "Invalid netmask provided (must be in range 4-32)");
444 return -1;
445 } else {
446 mask.s_addr = htonl(0xffffffff << (32 - shift));
447 }
448 }
449 net.s_addr &= mask.s_addr;
450 host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr);
451 dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr);
452 dns.s_addr = net.s_addr | (htonl(0x0203) & ~mask.s_addr);
453 }
454
455 if (vhost && !inet_aton(vhost, &host)) {
456 error_setg(errp, "Failed to parse host");
457 return -1;
458 }
459 if ((host.s_addr & mask.s_addr) != net.s_addr) {
460 error_setg(errp, "Host doesn't belong to network");
461 return -1;
462 }
463
464 if (vnameserver && !inet_aton(vnameserver, &dns)) {
465 error_setg(errp, "Failed to parse DNS");
466 return -1;
467 }
468 if (restricted && (dns.s_addr & mask.s_addr) != net.s_addr) {
469 error_setg(errp, "DNS doesn't belong to network");
470 return -1;
471 }
472 if (dns.s_addr == host.s_addr) {
473 error_setg(errp, "DNS must be different from host");
474 return -1;
475 }
476
477 if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) {
478 error_setg(errp, "Failed to parse DHCP start address");
479 return -1;
480 }
481 if ((dhcp.s_addr & mask.s_addr) != net.s_addr) {
482 error_setg(errp, "DHCP doesn't belong to network");
483 return -1;
484 }
485 if (dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) {
486 error_setg(errp, "DHCP must be different from host and DNS");
487 return -1;
488 }
489
490#if defined(CONFIG_SLIRP_SMBD)
491 if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) {
492 error_setg(errp, "Failed to parse SMB address");
493 return -1;
494 }
495#endif
496
497 if (!vprefix6) {
498 vprefix6 = "fec0::";
499 }
500 if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) {
501 error_setg(errp, "Failed to parse IPv6 prefix");
502 return -1;
503 }
504
505 if (!vprefix6_len) {
506 vprefix6_len = 64;
507 }
508 if (vprefix6_len < 0 || vprefix6_len > 126) {
509 error_setg(errp,
510 "Invalid IPv6 prefix provided "
511 "(IPv6 prefix length must be between 0 and 126)");
512 return -1;
513 }
514
515 if (vhost6) {
516 if (!inet_pton(AF_INET6, vhost6, &ip6_host)) {
517 error_setg(errp, "Failed to parse IPv6 host");
518 return -1;
519 }
520 if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) {
521 error_setg(errp, "IPv6 Host doesn't belong to network");
522 return -1;
523 }
524 } else {
525 ip6_host = ip6_prefix;
526 ip6_host.s6_addr[15] |= 2;
527 }
528
529 if (vnameserver6) {
530 if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) {
531 error_setg(errp, "Failed to parse IPv6 DNS");
532 return -1;
533 }
534 if (restricted && !in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) {
535 error_setg(errp, "IPv6 DNS doesn't belong to network");
536 return -1;
537 }
538 } else {
539 ip6_dns = ip6_prefix;
540 ip6_dns.s6_addr[15] |= 3;
541 }
542
543 if (vdomainname && !*vdomainname) {
544 error_setg(errp, "'domainname' parameter cannot be empty");
545 return -1;
546 }
547
548 if (vdomainname && strlen(vdomainname) > 255) {
549 error_setg(errp, "'domainname' parameter cannot exceed 255 bytes");
550 return -1;
551 }
552
553 if (vhostname && strlen(vhostname) > 255) {
554 error_setg(errp, "'vhostname' parameter cannot exceed 255 bytes");
555 return -1;
556 }
557
558 if (tftp_server_name && strlen(tftp_server_name) > 255) {
559 error_setg(errp, "'tftp-server-name' parameter cannot exceed 255 bytes");
560 return -1;
561 }
562
563 nc = qemu_new_net_client(&net_slirp_info, peer, model, name);
564
565 snprintf(nc->info_str, sizeof(nc->info_str),
566 "net=%s,restrict=%s", inet_ntoa(net),
567 restricted ? "on" : "off");
568
569 s = DO_UPCAST(SlirpState, nc, nc);
570
571 s->slirp = slirp_init(restricted, ipv4, net, mask, host,
572 ipv6, ip6_prefix, vprefix6_len, ip6_host,
573 vhostname, tftp_server_name,
574 tftp_export, bootfile, dhcp,
575 dns, ip6_dns, dnssearch, vdomainname,
576 &slirp_cb, s);
577 QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry);
578
579
580
581
582
583
584
585
586
587 g_assert(slirp_state_version() == 4);
588 register_savevm_live("slirp", 0, slirp_state_version(),
589 &savevm_slirp_state, s->slirp);
590
591 s->poll_notifier.notify = net_slirp_poll_notify;
592 main_loop_poll_add_notifier(&s->poll_notifier);
593
594 for (config = slirp_configs; config; config = config->next) {
595 if (config->flags & SLIRP_CFG_HOSTFWD) {
596 if (slirp_hostfwd(s, config->str, errp) < 0) {
597 goto error;
598 }
599 } else {
600 if (slirp_guestfwd(s, config->str, errp) < 0) {
601 goto error;
602 }
603 }
604 }
605#if defined(CONFIG_SLIRP_SMBD)
606 if (smb_export) {
607 if (slirp_smb(s, smb_export, smbsrv, errp) < 0) {
608 goto error;
609 }
610 }
611#endif
612
613 s->exit_notifier.notify = slirp_smb_exit;
614 qemu_add_exit_notifier(&s->exit_notifier);
615 return 0;
616
617error:
618 qemu_del_net_client(nc);
619 return -1;
620}
621
622static SlirpState *slirp_lookup(Monitor *mon, const char *id)
623{
624 if (id) {
625 NetClientState *nc = qemu_find_netdev(id);
626 if (!nc) {
627 monitor_printf(mon, "unrecognized netdev id '%s'\n", id);
628 return NULL;
629 }
630 if (strcmp(nc->model, "user")) {
631 monitor_printf(mon, "invalid device specified\n");
632 return NULL;
633 }
634 return DO_UPCAST(SlirpState, nc, nc);
635 } else {
636 if (QTAILQ_EMPTY(&slirp_stacks)) {
637 monitor_printf(mon, "user mode network stack not in use\n");
638 return NULL;
639 }
640 return QTAILQ_FIRST(&slirp_stacks);
641 }
642}
643
644void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict)
645{
646 struct in_addr host_addr = { .s_addr = INADDR_ANY };
647 int host_port;
648 char buf[256];
649 const char *src_str, *p;
650 SlirpState *s;
651 int is_udp = 0;
652 int err;
653 const char *arg1 = qdict_get_str(qdict, "arg1");
654 const char *arg2 = qdict_get_try_str(qdict, "arg2");
655
656 if (arg2) {
657 s = slirp_lookup(mon, arg1);
658 src_str = arg2;
659 } else {
660 s = slirp_lookup(mon, NULL);
661 src_str = arg1;
662 }
663 if (!s) {
664 return;
665 }
666
667 p = src_str;
668 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
669 goto fail_syntax;
670 }
671
672 if (!strcmp(buf, "tcp") || buf[0] == '\0') {
673 is_udp = 0;
674 } else if (!strcmp(buf, "udp")) {
675 is_udp = 1;
676 } else {
677 goto fail_syntax;
678 }
679
680 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
681 goto fail_syntax;
682 }
683 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
684 goto fail_syntax;
685 }
686
687 if (qemu_strtoi(p, NULL, 10, &host_port)) {
688 goto fail_syntax;
689 }
690
691 err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port);
692
693 monitor_printf(mon, "host forwarding rule for %s %s\n", src_str,
694 err ? "not found" : "removed");
695 return;
696
697 fail_syntax:
698 monitor_printf(mon, "invalid format\n");
699}
700
701static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp)
702{
703 struct in_addr host_addr = { .s_addr = INADDR_ANY };
704 struct in_addr guest_addr = { .s_addr = 0 };
705 int host_port, guest_port;
706 const char *p;
707 char buf[256];
708 int is_udp;
709 char *end;
710 const char *fail_reason = "Unknown reason";
711
712 p = redir_str;
713 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
714 fail_reason = "No : separators";
715 goto fail_syntax;
716 }
717 if (!strcmp(buf, "tcp") || buf[0] == '\0') {
718 is_udp = 0;
719 } else if (!strcmp(buf, "udp")) {
720 is_udp = 1;
721 } else {
722 fail_reason = "Bad protocol name";
723 goto fail_syntax;
724 }
725
726 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
727 fail_reason = "Missing : separator";
728 goto fail_syntax;
729 }
730 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
731 fail_reason = "Bad host address";
732 goto fail_syntax;
733 }
734
735 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
736 fail_reason = "Bad host port separator";
737 goto fail_syntax;
738 }
739 host_port = strtol(buf, &end, 0);
740 if (*end != '\0' || host_port < 0 || host_port > 65535) {
741 fail_reason = "Bad host port";
742 goto fail_syntax;
743 }
744
745 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
746 fail_reason = "Missing guest address";
747 goto fail_syntax;
748 }
749 if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) {
750 fail_reason = "Bad guest address";
751 goto fail_syntax;
752 }
753
754 guest_port = strtol(p, &end, 0);
755 if (*end != '\0' || guest_port < 1 || guest_port > 65535) {
756 fail_reason = "Bad guest port";
757 goto fail_syntax;
758 }
759
760 if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr,
761 guest_port) < 0) {
762 error_setg(errp, "Could not set up host forwarding rule '%s'",
763 redir_str);
764 return -1;
765 }
766 return 0;
767
768 fail_syntax:
769 error_setg(errp, "Invalid host forwarding rule '%s' (%s)", redir_str,
770 fail_reason);
771 return -1;
772}
773
774void hmp_hostfwd_add(Monitor *mon, const QDict *qdict)
775{
776 const char *redir_str;
777 SlirpState *s;
778 const char *arg1 = qdict_get_str(qdict, "arg1");
779 const char *arg2 = qdict_get_try_str(qdict, "arg2");
780
781 if (arg2) {
782 s = slirp_lookup(mon, arg1);
783 redir_str = arg2;
784 } else {
785 s = slirp_lookup(mon, NULL);
786 redir_str = arg1;
787 }
788 if (s) {
789 Error *err = NULL;
790 if (slirp_hostfwd(s, redir_str, &err) < 0) {
791 error_report_err(err);
792 }
793 }
794
795}
796
797#if defined(CONFIG_SLIRP_SMBD)
798
799
800static void slirp_smb_cleanup(SlirpState *s)
801{
802 int ret;
803
804 if (s->smb_dir) {
805 gchar *cmd = g_strdup_printf("rm -rf %s", s->smb_dir);
806 ret = system(cmd);
807 if (ret == -1 || !WIFEXITED(ret)) {
808 error_report("'%s' failed.", cmd);
809 } else if (WEXITSTATUS(ret)) {
810 error_report("'%s' failed. Error code: %d",
811 cmd, WEXITSTATUS(ret));
812 }
813 g_free(cmd);
814 g_free(s->smb_dir);
815 s->smb_dir = NULL;
816 }
817}
818
819static int slirp_smb(SlirpState* s, const char *exported_dir,
820 struct in_addr vserver_addr, Error **errp)
821{
822 char *smb_conf;
823 char *smb_cmdline;
824 struct passwd *passwd;
825 FILE *f;
826
827 passwd = getpwuid(geteuid());
828 if (!passwd) {
829 error_setg(errp, "Failed to retrieve user name");
830 return -1;
831 }
832
833 if (access(CONFIG_SMBD_COMMAND, F_OK)) {
834 error_setg(errp, "Could not find '%s', please install it",
835 CONFIG_SMBD_COMMAND);
836 return -1;
837 }
838
839 if (access(exported_dir, R_OK | X_OK)) {
840 error_setg(errp, "Error accessing shared directory '%s': %s",
841 exported_dir, strerror(errno));
842 return -1;
843 }
844
845 s->smb_dir = g_dir_make_tmp("qemu-smb.XXXXXX", NULL);
846 if (!s->smb_dir) {
847 error_setg(errp, "Could not create samba server dir");
848 return -1;
849 }
850 smb_conf = g_strdup_printf("%s/%s", s->smb_dir, "smb.conf");
851
852 f = fopen(smb_conf, "w");
853 if (!f) {
854 slirp_smb_cleanup(s);
855 error_setg(errp,
856 "Could not create samba server configuration file '%s'",
857 smb_conf);
858 g_free(smb_conf);
859 return -1;
860 }
861 fprintf(f,
862 "[global]\n"
863 "private dir=%s\n"
864 "interfaces=127.0.0.1\n"
865 "bind interfaces only=yes\n"
866 "pid directory=%s\n"
867 "lock directory=%s\n"
868 "state directory=%s\n"
869 "cache directory=%s\n"
870 "ncalrpc dir=%s/ncalrpc\n"
871 "log file=%s/log.smbd\n"
872 "smb passwd file=%s/smbpasswd\n"
873 "security = user\n"
874 "map to guest = Bad User\n"
875 "load printers = no\n"
876 "printing = bsd\n"
877 "disable spoolss = yes\n"
878 "usershare max shares = 0\n"
879 "[qemu]\n"
880 "path=%s\n"
881 "read only=no\n"
882 "guest ok=yes\n"
883 "force user=%s\n",
884 s->smb_dir,
885 s->smb_dir,
886 s->smb_dir,
887 s->smb_dir,
888 s->smb_dir,
889 s->smb_dir,
890 s->smb_dir,
891 s->smb_dir,
892 exported_dir,
893 passwd->pw_name
894 );
895 fclose(f);
896
897 smb_cmdline = g_strdup_printf("%s -l %s -s %s",
898 CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf);
899 g_free(smb_conf);
900
901 if (slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 139) < 0 ||
902 slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 445) < 0) {
903 slirp_smb_cleanup(s);
904 g_free(smb_cmdline);
905 error_setg(errp, "Conflicting/invalid smbserver address");
906 return -1;
907 }
908 g_free(smb_cmdline);
909 return 0;
910}
911
912#endif
913
914static int guestfwd_can_read(void *opaque)
915{
916 struct GuestFwd *fwd = opaque;
917 return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port);
918}
919
920static void guestfwd_read(void *opaque, const uint8_t *buf, int size)
921{
922 struct GuestFwd *fwd = opaque;
923 slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size);
924}
925
926static ssize_t guestfwd_write(const void *buf, size_t len, void *chr)
927{
928 return qemu_chr_fe_write_all(chr, buf, len);
929}
930
931static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp)
932{
933
934 struct in_addr server = { .s_addr = 0 };
935 struct GuestFwd *fwd;
936 const char *p;
937 char buf[128];
938 char *end;
939 int port;
940
941 p = config_str;
942 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
943 goto fail_syntax;
944 }
945 if (strcmp(buf, "tcp") && buf[0] != '\0') {
946 goto fail_syntax;
947 }
948 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
949 goto fail_syntax;
950 }
951 if (buf[0] != '\0' && !inet_aton(buf, &server)) {
952 goto fail_syntax;
953 }
954 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
955 goto fail_syntax;
956 }
957 port = strtol(buf, &end, 10);
958 if (*end != '\0' || port < 1 || port > 65535) {
959 goto fail_syntax;
960 }
961
962 snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port);
963
964 if (g_str_has_prefix(p, "cmd:")) {
965 if (slirp_add_exec(s->slirp, &p[4], &server, port) < 0) {
966 error_setg(errp, "Conflicting/invalid host:port in guest "
967 "forwarding rule '%s'", config_str);
968 return -1;
969 }
970 } else {
971 Error *err = NULL;
972
973
974
975
976 Chardev *chr = qemu_chr_new_mux_mon(buf, p, NULL);
977
978 if (!chr) {
979 error_setg(errp, "Could not open guest forwarding device '%s'",
980 buf);
981 return -1;
982 }
983
984 fwd = g_new(struct GuestFwd, 1);
985 qemu_chr_fe_init(&fwd->hd, chr, &err);
986 if (err) {
987 error_propagate(errp, err);
988 object_unparent(OBJECT(chr));
989 g_free(fwd);
990 return -1;
991 }
992
993 if (slirp_add_guestfwd(s->slirp, guestfwd_write, &fwd->hd,
994 &server, port) < 0) {
995 error_setg(errp, "Conflicting/invalid host:port in guest "
996 "forwarding rule '%s'", config_str);
997 qemu_chr_fe_deinit(&fwd->hd, true);
998 g_free(fwd);
999 return -1;
1000 }
1001 fwd->server = server;
1002 fwd->port = port;
1003 fwd->slirp = s->slirp;
1004
1005 qemu_chr_fe_set_handlers(&fwd->hd, guestfwd_can_read, guestfwd_read,
1006 NULL, NULL, fwd, NULL, true);
1007 s->fwd = g_slist_append(s->fwd, fwd);
1008 }
1009 return 0;
1010
1011 fail_syntax:
1012 error_setg(errp, "Invalid guest forwarding rule '%s'", config_str);
1013 return -1;
1014}
1015
1016void hmp_info_usernet(Monitor *mon, const QDict *qdict)
1017{
1018 SlirpState *s;
1019
1020 QTAILQ_FOREACH(s, &slirp_stacks, entry) {
1021 int id;
1022 bool got_hub_id = net_hub_id_for_client(&s->nc, &id) == 0;
1023 char *info = slirp_connection_info(s->slirp);
1024 monitor_printf(mon, "Hub %d (%s):\n%s",
1025 got_hub_id ? id : -1,
1026 s->nc.name, info);
1027 g_free(info);
1028 }
1029}
1030
1031static void
1032net_init_slirp_configs(const StringList *fwd, int flags)
1033{
1034 while (fwd) {
1035 struct slirp_config_str *config;
1036
1037 config = g_malloc0(sizeof(*config));
1038 pstrcpy(config->str, sizeof(config->str), fwd->value->str);
1039 config->flags = flags;
1040 config->next = slirp_configs;
1041 slirp_configs = config;
1042
1043 fwd = fwd->next;
1044 }
1045}
1046
1047static const char **slirp_dnssearch(const StringList *dnsname)
1048{
1049 const StringList *c = dnsname;
1050 size_t i = 0, num_opts = 0;
1051 const char **ret;
1052
1053 while (c) {
1054 num_opts++;
1055 c = c->next;
1056 }
1057
1058 if (num_opts == 0) {
1059 return NULL;
1060 }
1061
1062 ret = g_malloc((num_opts + 1) * sizeof(*ret));
1063 c = dnsname;
1064 while (c) {
1065 ret[i++] = c->value->str;
1066 c = c->next;
1067 }
1068 ret[i] = NULL;
1069 return ret;
1070}
1071
1072int net_init_slirp(const Netdev *netdev, const char *name,
1073 NetClientState *peer, Error **errp)
1074{
1075 struct slirp_config_str *config;
1076 char *vnet;
1077 int ret;
1078 const NetdevUserOptions *user;
1079 const char **dnssearch;
1080 bool ipv4 = true, ipv6 = true;
1081
1082 assert(netdev->type == NET_CLIENT_DRIVER_USER);
1083 user = &netdev->u.user;
1084
1085 if ((user->has_ipv6 && user->ipv6 && !user->has_ipv4) ||
1086 (user->has_ipv4 && !user->ipv4)) {
1087 ipv4 = 0;
1088 }
1089 if ((user->has_ipv4 && user->ipv4 && !user->has_ipv6) ||
1090 (user->has_ipv6 && !user->ipv6)) {
1091 ipv6 = 0;
1092 }
1093
1094 vnet = user->has_net ? g_strdup(user->net) :
1095 user->has_ip ? g_strdup_printf("%s/24", user->ip) :
1096 NULL;
1097
1098 dnssearch = slirp_dnssearch(user->dnssearch);
1099
1100
1101
1102 net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD);
1103 net_init_slirp_configs(user->guestfwd, 0);
1104
1105 ret = net_slirp_init(peer, "user", name, user->q_restrict,
1106 ipv4, vnet, user->host,
1107 ipv6, user->ipv6_prefix, user->ipv6_prefixlen,
1108 user->ipv6_host, user->hostname, user->tftp,
1109 user->bootfile, user->dhcpstart,
1110 user->dns, user->ipv6_dns, user->smb,
1111 user->smbserver, dnssearch, user->domainname,
1112 user->tftp_server_name, errp);
1113
1114 while (slirp_configs) {
1115 config = slirp_configs;
1116 slirp_configs = config->next;
1117 g_free(config);
1118 }
1119
1120 g_free(vnet);
1121 g_free(dnssearch);
1122
1123 return ret;
1124}
1125
