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25#include "qemu/osdep.h"
26#include "net/slirp.h"
27
28
29#ifndef _WIN32
30#include <pwd.h>
31#include <sys/wait.h>
32#endif
33#include "net/net.h"
34#include "clients.h"
35#include "hub.h"
36#include "monitor/monitor.h"
37#include "qemu/error-report.h"
38#include "qemu/sockets.h"
39#include "slirp/libslirp.h"
40#include "slirp/ip6.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
47static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
48{
49 const char *p, *p1;
50 int len;
51 p = *pp;
52 p1 = strchr(p, sep);
53 if (!p1)
54 return -1;
55 len = p1 - p;
56 p1++;
57 if (buf_size > 0) {
58 if (len > buf_size - 1)
59 len = buf_size - 1;
60 memcpy(buf, p, len);
61 buf[len] = '\0';
62 }
63 *pp = p1;
64 return 0;
65}
66
67
68
69#define SLIRP_CFG_HOSTFWD 1
70#define SLIRP_CFG_LEGACY 2
71
72struct slirp_config_str {
73 struct slirp_config_str *next;
74 int flags;
75 char str[1024];
76 int legacy_format;
77};
78
79typedef struct SlirpState {
80 NetClientState nc;
81 QTAILQ_ENTRY(SlirpState) entry;
82 Slirp *slirp;
83 Notifier exit_notifier;
84#ifndef _WIN32
85 gchar *smb_dir;
86#endif
87} SlirpState;
88
89static struct slirp_config_str *slirp_configs;
90const char *legacy_tftp_prefix;
91const char *legacy_bootp_filename;
92static QTAILQ_HEAD(slirp_stacks, SlirpState) slirp_stacks =
93 QTAILQ_HEAD_INITIALIZER(slirp_stacks);
94
95static int slirp_hostfwd(SlirpState *s, const char *redir_str,
96 int legacy_format, Error **errp);
97static int slirp_guestfwd(SlirpState *s, const char *config_str,
98 int legacy_format, Error **errp);
99
100#ifndef _WIN32
101static const char *legacy_smb_export;
102
103static int slirp_smb(SlirpState *s, const char *exported_dir,
104 struct in_addr vserver_addr, Error **errp);
105static void slirp_smb_cleanup(SlirpState *s);
106#else
107static inline void slirp_smb_cleanup(SlirpState *s) { }
108#endif
109
110void slirp_output(void *opaque, const uint8_t *pkt, int pkt_len)
111{
112 SlirpState *s = opaque;
113
114 qemu_send_packet(&s->nc, pkt, pkt_len);
115}
116
117static ssize_t net_slirp_receive(NetClientState *nc, const uint8_t *buf, size_t size)
118{
119 SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
120
121 slirp_input(s->slirp, buf, size);
122
123 return size;
124}
125
126static void slirp_smb_exit(Notifier *n, void *data)
127{
128 SlirpState *s = container_of(n, SlirpState, exit_notifier);
129 slirp_smb_cleanup(s);
130}
131
132static void net_slirp_cleanup(NetClientState *nc)
133{
134 SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
135
136 slirp_cleanup(s->slirp);
137 if (s->exit_notifier.notify) {
138 qemu_remove_exit_notifier(&s->exit_notifier);
139 }
140 slirp_smb_cleanup(s);
141 QTAILQ_REMOVE(&slirp_stacks, s, entry);
142}
143
144static NetClientInfo net_slirp_info = {
145 .type = NET_CLIENT_DRIVER_USER,
146 .size = sizeof(SlirpState),
147 .receive = net_slirp_receive,
148 .cleanup = net_slirp_cleanup,
149};
150
151static int net_slirp_init(NetClientState *peer, const char *model,
152 const char *name, int restricted,
153 bool ipv4, const char *vnetwork, const char *vhost,
154 bool ipv6, const char *vprefix6, int vprefix6_len,
155 const char *vhost6,
156 const char *vhostname, const char *tftp_export,
157 const char *bootfile, const char *vdhcp_start,
158 const char *vnameserver, const char *vnameserver6,
159 const char *smb_export, const char *vsmbserver,
160 const char **dnssearch, const char *vdomainname,
161 Error **errp)
162{
163
164 struct in_addr net = { .s_addr = htonl(0x0a000200) };
165 struct in_addr mask = { .s_addr = htonl(0xffffff00) };
166 struct in_addr host = { .s_addr = htonl(0x0a000202) };
167 struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) };
168 struct in_addr dns = { .s_addr = htonl(0x0a000203) };
169 struct in6_addr ip6_prefix;
170 struct in6_addr ip6_host;
171 struct in6_addr ip6_dns;
172#ifndef _WIN32
173 struct in_addr smbsrv = { .s_addr = 0 };
174#endif
175 NetClientState *nc;
176 SlirpState *s;
177 char buf[20];
178 uint32_t addr;
179 int shift;
180 char *end;
181 struct slirp_config_str *config;
182
183 if (!ipv4 && (vnetwork || vhost || vnameserver)) {
184 error_setg(errp, "IPv4 disabled but netmask/host/dns provided");
185 return -1;
186 }
187
188 if (!ipv6 && (vprefix6 || vhost6 || vnameserver6)) {
189 error_setg(errp, "IPv6 disabled but prefix/host6/dns6 provided");
190 return -1;
191 }
192
193 if (!ipv4 && !ipv6) {
194
195 error_setg(errp, "IPv4 and IPv6 disabled");
196 return -1;
197 }
198
199 if (!tftp_export) {
200 tftp_export = legacy_tftp_prefix;
201 }
202 if (!bootfile) {
203 bootfile = legacy_bootp_filename;
204 }
205
206 if (vnetwork) {
207 if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) {
208 if (!inet_aton(vnetwork, &net)) {
209 error_setg(errp, "Failed to parse netmask");
210 return -1;
211 }
212 addr = ntohl(net.s_addr);
213 if (!(addr & 0x80000000)) {
214 mask.s_addr = htonl(0xff000000);
215 } else if ((addr & 0xfff00000) == 0xac100000) {
216 mask.s_addr = htonl(0xfff00000);
217 } else if ((addr & 0xc0000000) == 0x80000000) {
218 mask.s_addr = htonl(0xffff0000);
219 } else if ((addr & 0xffff0000) == 0xc0a80000) {
220 mask.s_addr = htonl(0xffff0000);
221 } else if ((addr & 0xffff0000) == 0xc6120000) {
222 mask.s_addr = htonl(0xfffe0000);
223 } else if ((addr & 0xe0000000) == 0xe0000000) {
224 mask.s_addr = htonl(0xffffff00);
225 } else {
226 mask.s_addr = htonl(0xfffffff0);
227 }
228 } else {
229 if (!inet_aton(buf, &net)) {
230 error_setg(errp, "Failed to parse netmask");
231 return -1;
232 }
233 shift = strtol(vnetwork, &end, 10);
234 if (*end != '\0') {
235 if (!inet_aton(vnetwork, &mask)) {
236 error_setg(errp,
237 "Failed to parse netmask (trailing chars)");
238 return -1;
239 }
240 } else if (shift < 4 || shift > 32) {
241 error_setg(errp,
242 "Invalid netmask provided (must be in range 4-32)");
243 return -1;
244 } else {
245 mask.s_addr = htonl(0xffffffff << (32 - shift));
246 }
247 }
248 net.s_addr &= mask.s_addr;
249 host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr);
250 dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr);
251 dns.s_addr = net.s_addr | (htonl(0x0203) & ~mask.s_addr);
252 }
253
254 if (vhost && !inet_aton(vhost, &host)) {
255 error_setg(errp, "Failed to parse host");
256 return -1;
257 }
258 if ((host.s_addr & mask.s_addr) != net.s_addr) {
259 error_setg(errp, "Host doesn't belong to network");
260 return -1;
261 }
262
263 if (vnameserver && !inet_aton(vnameserver, &dns)) {
264 error_setg(errp, "Failed to parse DNS");
265 return -1;
266 }
267 if ((dns.s_addr & mask.s_addr) != net.s_addr) {
268 error_setg(errp, "DNS doesn't belong to network");
269 return -1;
270 }
271 if (dns.s_addr == host.s_addr) {
272 error_setg(errp, "DNS must be different from host");
273 return -1;
274 }
275
276 if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) {
277 error_setg(errp, "Failed to parse DHCP start address");
278 return -1;
279 }
280 if ((dhcp.s_addr & mask.s_addr) != net.s_addr) {
281 error_setg(errp, "DHCP doesn't belong to network");
282 return -1;
283 }
284 if (dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) {
285 error_setg(errp, "DNS must be different from host and DNS");
286 return -1;
287 }
288
289#ifndef _WIN32
290 if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) {
291 error_setg(errp, "Failed to parse SMB address");
292 return -1;
293 }
294#endif
295
296#if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
297
298 if (vprefix6) {
299
300 error_setg(errp, "IPv6 prefix not supported");
301 return -1;
302 }
303 memset(&ip6_prefix, 0, sizeof(ip6_prefix));
304 ip6_prefix.s6_addr[0] = 0xfe;
305 ip6_prefix.s6_addr[1] = 0xc0;
306#else
307 if (!vprefix6) {
308 vprefix6 = "fec0::";
309 }
310 if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) {
311 error_setg(errp, "Failed to parse IPv6 prefix");
312 return -1;
313 }
314#endif
315
316 if (!vprefix6_len) {
317 vprefix6_len = 64;
318 }
319 if (vprefix6_len < 0 || vprefix6_len > 126) {
320 error_setg(errp,
321 "Invalid prefix provided (prefix len must be in range 0-126");
322 return -1;
323 }
324
325 if (vhost6) {
326#if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
327 error_setg(errp, "IPv6 host not supported");
328 return -1;
329#else
330 if (!inet_pton(AF_INET6, vhost6, &ip6_host)) {
331 error_setg(errp, "Failed to parse IPv6 host");
332 return -1;
333 }
334 if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) {
335 error_setg(errp, "IPv6 Host doesn't belong to network");
336 return -1;
337 }
338#endif
339 } else {
340 ip6_host = ip6_prefix;
341 ip6_host.s6_addr[15] |= 2;
342 }
343
344 if (vnameserver6) {
345#if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
346 error_setg(errp, "IPv6 DNS not supported");
347 return -1;
348#else
349 if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) {
350 error_setg(errp, "Failed to parse IPv6 DNS");
351 return -1;
352 }
353 if (!in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) {
354 error_setg(errp, "IPv6 DNS doesn't belong to network");
355 return -1;
356 }
357#endif
358 } else {
359 ip6_dns = ip6_prefix;
360 ip6_dns.s6_addr[15] |= 3;
361 }
362
363 if (vdomainname && !*vdomainname) {
364 error_setg(errp, "'domainname' parameter cannot be empty");
365 return -1;
366 }
367
368
369 nc = qemu_new_net_client(&net_slirp_info, peer, model, name);
370
371 snprintf(nc->info_str, sizeof(nc->info_str),
372 "net=%s,restrict=%s", inet_ntoa(net),
373 restricted ? "on" : "off");
374
375 s = DO_UPCAST(SlirpState, nc, nc);
376
377 s->slirp = slirp_init(restricted, ipv4, net, mask, host,
378 ipv6, ip6_prefix, vprefix6_len, ip6_host,
379 vhostname, tftp_export, bootfile, dhcp,
380 dns, ip6_dns, dnssearch, vdomainname, s);
381 QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry);
382
383 for (config = slirp_configs; config; config = config->next) {
384 if (config->flags & SLIRP_CFG_HOSTFWD) {
385 if (slirp_hostfwd(s, config->str,
386 config->flags & SLIRP_CFG_LEGACY, errp) < 0) {
387 goto error;
388 }
389 } else {
390 if (slirp_guestfwd(s, config->str,
391 config->flags & SLIRP_CFG_LEGACY, errp) < 0) {
392 goto error;
393 }
394 }
395 }
396#ifndef _WIN32
397 if (!smb_export) {
398 smb_export = legacy_smb_export;
399 }
400 if (smb_export) {
401 if (slirp_smb(s, smb_export, smbsrv, errp) < 0) {
402 goto error;
403 }
404 }
405#endif
406
407 s->exit_notifier.notify = slirp_smb_exit;
408 qemu_add_exit_notifier(&s->exit_notifier);
409 return 0;
410
411error:
412 qemu_del_net_client(nc);
413 return -1;
414}
415
416static SlirpState *slirp_lookup(Monitor *mon, const char *hub_id,
417 const char *name)
418{
419 if (name) {
420 NetClientState *nc;
421 if (hub_id) {
422 nc = net_hub_find_client_by_name(strtol(hub_id, NULL, 0), name);
423 if (!nc) {
424 monitor_printf(mon, "unrecognized (hub-id, stackname) pair\n");
425 return NULL;
426 }
427 } else {
428 nc = qemu_find_netdev(name);
429 if (!nc) {
430 monitor_printf(mon, "unrecognized netdev id '%s'\n", name);
431 return NULL;
432 }
433 }
434 if (strcmp(nc->model, "user")) {
435 monitor_printf(mon, "invalid device specified\n");
436 return NULL;
437 }
438 return DO_UPCAST(SlirpState, nc, nc);
439 } else {
440 if (QTAILQ_EMPTY(&slirp_stacks)) {
441 monitor_printf(mon, "user mode network stack not in use\n");
442 return NULL;
443 }
444 return QTAILQ_FIRST(&slirp_stacks);
445 }
446}
447
448void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict)
449{
450 struct in_addr host_addr = { .s_addr = INADDR_ANY };
451 int host_port;
452 char buf[256];
453 const char *src_str, *p;
454 SlirpState *s;
455 int is_udp = 0;
456 int err;
457 const char *arg1 = qdict_get_str(qdict, "arg1");
458 const char *arg2 = qdict_get_try_str(qdict, "arg2");
459 const char *arg3 = qdict_get_try_str(qdict, "arg3");
460
461 if (arg3) {
462 s = slirp_lookup(mon, arg1, arg2);
463 src_str = arg3;
464 } else if (arg2) {
465 s = slirp_lookup(mon, NULL, arg1);
466 src_str = arg2;
467 } else {
468 s = slirp_lookup(mon, NULL, NULL);
469 src_str = arg1;
470 }
471 if (!s) {
472 return;
473 }
474
475 p = src_str;
476 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
477 goto fail_syntax;
478 }
479
480 if (!strcmp(buf, "tcp") || buf[0] == '\0') {
481 is_udp = 0;
482 } else if (!strcmp(buf, "udp")) {
483 is_udp = 1;
484 } else {
485 goto fail_syntax;
486 }
487
488 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
489 goto fail_syntax;
490 }
491 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
492 goto fail_syntax;
493 }
494
495 if (qemu_strtoi(p, NULL, 10, &host_port)) {
496 goto fail_syntax;
497 }
498
499 err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port);
500
501 monitor_printf(mon, "host forwarding rule for %s %s\n", src_str,
502 err ? "not found" : "removed");
503 return;
504
505 fail_syntax:
506 monitor_printf(mon, "invalid format\n");
507}
508
509static int slirp_hostfwd(SlirpState *s, const char *redir_str,
510 int legacy_format, Error **errp)
511{
512 struct in_addr host_addr = { .s_addr = INADDR_ANY };
513 struct in_addr guest_addr = { .s_addr = 0 };
514 int host_port, guest_port;
515 const char *p;
516 char buf[256];
517 int is_udp;
518 char *end;
519 const char *fail_reason = "Unknown reason";
520
521 p = redir_str;
522 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
523 fail_reason = "No : separators";
524 goto fail_syntax;
525 }
526 if (!strcmp(buf, "tcp") || buf[0] == '\0') {
527 is_udp = 0;
528 } else if (!strcmp(buf, "udp")) {
529 is_udp = 1;
530 } else {
531 fail_reason = "Bad protocol name";
532 goto fail_syntax;
533 }
534
535 if (!legacy_format) {
536 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
537 fail_reason = "Missing : separator";
538 goto fail_syntax;
539 }
540 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
541 fail_reason = "Bad host address";
542 goto fail_syntax;
543 }
544 }
545
546 if (get_str_sep(buf, sizeof(buf), &p, legacy_format ? ':' : '-') < 0) {
547 fail_reason = "Bad host port separator";
548 goto fail_syntax;
549 }
550 host_port = strtol(buf, &end, 0);
551 if (*end != '\0' || host_port < 0 || host_port > 65535) {
552 fail_reason = "Bad host port";
553 goto fail_syntax;
554 }
555
556 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
557 fail_reason = "Missing guest address";
558 goto fail_syntax;
559 }
560 if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) {
561 fail_reason = "Bad guest address";
562 goto fail_syntax;
563 }
564
565 guest_port = strtol(p, &end, 0);
566 if (*end != '\0' || guest_port < 1 || guest_port > 65535) {
567 fail_reason = "Bad guest port";
568 goto fail_syntax;
569 }
570
571 if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr,
572 guest_port) < 0) {
573 error_setg(errp, "Could not set up host forwarding rule '%s'",
574 redir_str);
575 return -1;
576 }
577 return 0;
578
579 fail_syntax:
580 error_setg(errp, "Invalid host forwarding rule '%s' (%s)", redir_str,
581 fail_reason);
582 return -1;
583}
584
585void hmp_hostfwd_add(Monitor *mon, const QDict *qdict)
586{
587 const char *redir_str;
588 SlirpState *s;
589 const char *arg1 = qdict_get_str(qdict, "arg1");
590 const char *arg2 = qdict_get_try_str(qdict, "arg2");
591 const char *arg3 = qdict_get_try_str(qdict, "arg3");
592
593 if (arg3) {
594 s = slirp_lookup(mon, arg1, arg2);
595 redir_str = arg3;
596 } else if (arg2) {
597 s = slirp_lookup(mon, NULL, arg1);
598 redir_str = arg2;
599 } else {
600 s = slirp_lookup(mon, NULL, NULL);
601 redir_str = arg1;
602 }
603 if (s) {
604 Error *err = NULL;
605 if (slirp_hostfwd(s, redir_str, 0, &err) < 0) {
606 error_report_err(err);
607 }
608 }
609
610}
611
612int net_slirp_redir(const char *redir_str)
613{
614 struct slirp_config_str *config;
615 Error *err = NULL;
616 int res;
617
618 if (QTAILQ_EMPTY(&slirp_stacks)) {
619 config = g_malloc(sizeof(*config));
620 pstrcpy(config->str, sizeof(config->str), redir_str);
621 config->flags = SLIRP_CFG_HOSTFWD | SLIRP_CFG_LEGACY;
622 config->next = slirp_configs;
623 slirp_configs = config;
624 return 0;
625 }
626
627 res = slirp_hostfwd(QTAILQ_FIRST(&slirp_stacks), redir_str, 1, &err);
628 if (res < 0) {
629 error_report_err(err);
630 }
631 return res;
632}
633
634#ifndef _WIN32
635
636
637static void slirp_smb_cleanup(SlirpState *s)
638{
639 int ret;
640
641 if (s->smb_dir) {
642 gchar *cmd = g_strdup_printf("rm -rf %s", s->smb_dir);
643 ret = system(cmd);
644 if (ret == -1 || !WIFEXITED(ret)) {
645 error_report("'%s' failed.", cmd);
646 } else if (WEXITSTATUS(ret)) {
647 error_report("'%s' failed. Error code: %d",
648 cmd, WEXITSTATUS(ret));
649 }
650 g_free(cmd);
651 g_free(s->smb_dir);
652 s->smb_dir = NULL;
653 }
654}
655
656static int slirp_smb(SlirpState* s, const char *exported_dir,
657 struct in_addr vserver_addr, Error **errp)
658{
659 char *smb_conf;
660 char *smb_cmdline;
661 struct passwd *passwd;
662 FILE *f;
663
664 passwd = getpwuid(geteuid());
665 if (!passwd) {
666 error_setg(errp, "Failed to retrieve user name");
667 return -1;
668 }
669
670 if (access(CONFIG_SMBD_COMMAND, F_OK)) {
671 error_setg(errp, "Could not find '%s', please install it",
672 CONFIG_SMBD_COMMAND);
673 return -1;
674 }
675
676 if (access(exported_dir, R_OK | X_OK)) {
677 error_setg(errp, "Error accessing shared directory '%s': %s",
678 exported_dir, strerror(errno));
679 return -1;
680 }
681
682 s->smb_dir = g_dir_make_tmp("qemu-smb.XXXXXX", NULL);
683 if (!s->smb_dir) {
684 error_setg(errp, "Could not create samba server dir");
685 return -1;
686 }
687 smb_conf = g_strdup_printf("%s/%s", s->smb_dir, "smb.conf");
688
689 f = fopen(smb_conf, "w");
690 if (!f) {
691 slirp_smb_cleanup(s);
692 error_setg(errp,
693 "Could not create samba server configuration file '%s'",
694 smb_conf);
695 g_free(smb_conf);
696 return -1;
697 }
698 fprintf(f,
699 "[global]\n"
700 "private dir=%s\n"
701 "interfaces=127.0.0.1\n"
702 "bind interfaces only=yes\n"
703 "pid directory=%s\n"
704 "lock directory=%s\n"
705 "state directory=%s\n"
706 "cache directory=%s\n"
707 "ncalrpc dir=%s/ncalrpc\n"
708 "log file=%s/log.smbd\n"
709 "smb passwd file=%s/smbpasswd\n"
710 "security = user\n"
711 "map to guest = Bad User\n"
712 "load printers = no\n"
713 "printing = bsd\n"
714 "disable spoolss = yes\n"
715 "usershare max shares = 0\n"
716 "[qemu]\n"
717 "path=%s\n"
718 "read only=no\n"
719 "guest ok=yes\n"
720 "force user=%s\n",
721 s->smb_dir,
722 s->smb_dir,
723 s->smb_dir,
724 s->smb_dir,
725 s->smb_dir,
726 s->smb_dir,
727 s->smb_dir,
728 s->smb_dir,
729 exported_dir,
730 passwd->pw_name
731 );
732 fclose(f);
733
734 smb_cmdline = g_strdup_printf("%s -l %s -s %s",
735 CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf);
736 g_free(smb_conf);
737
738 if (slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 139) < 0 ||
739 slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 445) < 0) {
740 slirp_smb_cleanup(s);
741 g_free(smb_cmdline);
742 error_setg(errp, "Conflicting/invalid smbserver address");
743 return -1;
744 }
745 g_free(smb_cmdline);
746 return 0;
747}
748
749
750int net_slirp_smb(const char *exported_dir)
751{
752 struct in_addr vserver_addr = { .s_addr = 0 };
753
754 if (legacy_smb_export) {
755 fprintf(stderr, "-smb given twice\n");
756 return -1;
757 }
758 legacy_smb_export = exported_dir;
759 if (!QTAILQ_EMPTY(&slirp_stacks)) {
760 Error *err = NULL;
761 int res = slirp_smb(QTAILQ_FIRST(&slirp_stacks), exported_dir,
762 vserver_addr, &err);
763 if (res < 0) {
764 error_report_err(err);
765 }
766 return res;
767 }
768 return 0;
769}
770
771#endif
772
773struct GuestFwd {
774 CharBackend hd;
775 struct in_addr server;
776 int port;
777 Slirp *slirp;
778};
779
780static int guestfwd_can_read(void *opaque)
781{
782 struct GuestFwd *fwd = opaque;
783 return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port);
784}
785
786static void guestfwd_read(void *opaque, const uint8_t *buf, int size)
787{
788 struct GuestFwd *fwd = opaque;
789 slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size);
790}
791
792static int slirp_guestfwd(SlirpState *s, const char *config_str,
793 int legacy_format, Error **errp)
794{
795 struct in_addr server = { .s_addr = 0 };
796 struct GuestFwd *fwd;
797 const char *p;
798 char buf[128];
799 char *end;
800 int port;
801
802 p = config_str;
803 if (legacy_format) {
804 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
805 goto fail_syntax;
806 }
807 } else {
808 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
809 goto fail_syntax;
810 }
811 if (strcmp(buf, "tcp") && buf[0] != '\0') {
812 goto fail_syntax;
813 }
814 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
815 goto fail_syntax;
816 }
817 if (buf[0] != '\0' && !inet_aton(buf, &server)) {
818 goto fail_syntax;
819 }
820 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
821 goto fail_syntax;
822 }
823 }
824 port = strtol(buf, &end, 10);
825 if (*end != '\0' || port < 1 || port > 65535) {
826 goto fail_syntax;
827 }
828
829 snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port);
830
831 if ((strlen(p) > 4) && !strncmp(p, "cmd:", 4)) {
832 if (slirp_add_exec(s->slirp, 0, &p[4], &server, port) < 0) {
833 error_setg(errp, "Conflicting/invalid host:port in guest "
834 "forwarding rule '%s'", config_str);
835 return -1;
836 }
837 } else {
838 Error *err = NULL;
839 Chardev *chr = qemu_chr_new(buf, p);
840
841 if (!chr) {
842 error_setg(errp, "Could not open guest forwarding device '%s'",
843 buf);
844 return -1;
845 }
846
847 fwd = g_new(struct GuestFwd, 1);
848 qemu_chr_fe_init(&fwd->hd, chr, &err);
849 if (err) {
850 error_propagate(errp, err);
851 g_free(fwd);
852 return -1;
853 }
854
855 if (slirp_add_exec(s->slirp, 3, &fwd->hd, &server, port) < 0) {
856 error_setg(errp, "Conflicting/invalid host:port in guest "
857 "forwarding rule '%s'", config_str);
858 g_free(fwd);
859 return -1;
860 }
861 fwd->server = server;
862 fwd->port = port;
863 fwd->slirp = s->slirp;
864
865 qemu_chr_fe_set_handlers(&fwd->hd, guestfwd_can_read, guestfwd_read,
866 NULL, NULL, fwd, NULL, true);
867 }
868 return 0;
869
870 fail_syntax:
871 error_setg(errp, "Invalid guest forwarding rule '%s'", config_str);
872 return -1;
873}
874
875void hmp_info_usernet(Monitor *mon, const QDict *qdict)
876{
877 SlirpState *s;
878
879 QTAILQ_FOREACH(s, &slirp_stacks, entry) {
880 int id;
881 bool got_hub_id = net_hub_id_for_client(&s->nc, &id) == 0;
882 monitor_printf(mon, "Hub %d (%s):\n",
883 got_hub_id ? id : -1,
884 s->nc.name);
885 slirp_connection_info(s->slirp, mon);
886 }
887}
888
889static void
890net_init_slirp_configs(const StringList *fwd, int flags)
891{
892 while (fwd) {
893 struct slirp_config_str *config;
894
895 config = g_malloc0(sizeof(*config));
896 pstrcpy(config->str, sizeof(config->str), fwd->value->str);
897 config->flags = flags;
898 config->next = slirp_configs;
899 slirp_configs = config;
900
901 fwd = fwd->next;
902 }
903}
904
905static const char **slirp_dnssearch(const StringList *dnsname)
906{
907 const StringList *c = dnsname;
908 size_t i = 0, num_opts = 0;
909 const char **ret;
910
911 while (c) {
912 num_opts++;
913 c = c->next;
914 }
915
916 if (num_opts == 0) {
917 return NULL;
918 }
919
920 ret = g_malloc((num_opts + 1) * sizeof(*ret));
921 c = dnsname;
922 while (c) {
923 ret[i++] = c->value->str;
924 c = c->next;
925 }
926 ret[i] = NULL;
927 return ret;
928}
929
930int net_init_slirp(const Netdev *netdev, const char *name,
931 NetClientState *peer, Error **errp)
932{
933 struct slirp_config_str *config;
934 char *vnet;
935 int ret;
936 const NetdevUserOptions *user;
937 const char **dnssearch;
938 bool ipv4 = true, ipv6 = true;
939
940 assert(netdev->type == NET_CLIENT_DRIVER_USER);
941 user = &netdev->u.user;
942
943 if ((user->has_ipv6 && user->ipv6 && !user->has_ipv4) ||
944 (user->has_ipv4 && !user->ipv4)) {
945 ipv4 = 0;
946 }
947 if ((user->has_ipv4 && user->ipv4 && !user->has_ipv6) ||
948 (user->has_ipv6 && !user->ipv6)) {
949 ipv6 = 0;
950 }
951
952 vnet = user->has_net ? g_strdup(user->net) :
953 user->has_ip ? g_strdup_printf("%s/24", user->ip) :
954 NULL;
955
956 dnssearch = slirp_dnssearch(user->dnssearch);
957
958
959
960 net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD);
961 net_init_slirp_configs(user->guestfwd, 0);
962
963 ret = net_slirp_init(peer, "user", name, user->q_restrict,
964 ipv4, vnet, user->host,
965 ipv6, user->ipv6_prefix, user->ipv6_prefixlen,
966 user->ipv6_host, user->hostname, user->tftp,
967 user->bootfile, user->dhcpstart,
968 user->dns, user->ipv6_dns, user->smb,
969 user->smbserver, dnssearch, user->domainname, errp);
970
971 while (slirp_configs) {
972 config = slirp_configs;
973 slirp_configs = config->next;
974 g_free(config);
975 }
976
977 g_free(vnet);
978 g_free(dnssearch);
979
980 return ret;
981}
982
