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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 if (vdomainname && strlen(vdomainname) > 255) {
369 error_setg(errp, "'domainname' parameter cannot exceed 255 bytes");
370 return -1;
371 }
372
373 if (vhostname && strlen(vhostname) > 255) {
374 error_setg(errp, "'vhostname' parameter cannot exceed 255 bytes");
375 return -1;
376 }
377
378 nc = qemu_new_net_client(&net_slirp_info, peer, model, name);
379
380 snprintf(nc->info_str, sizeof(nc->info_str),
381 "net=%s,restrict=%s", inet_ntoa(net),
382 restricted ? "on" : "off");
383
384 s = DO_UPCAST(SlirpState, nc, nc);
385
386 s->slirp = slirp_init(restricted, ipv4, net, mask, host,
387 ipv6, ip6_prefix, vprefix6_len, ip6_host,
388 vhostname, tftp_export, bootfile, dhcp,
389 dns, ip6_dns, dnssearch, vdomainname, s);
390 QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry);
391
392 for (config = slirp_configs; config; config = config->next) {
393 if (config->flags & SLIRP_CFG_HOSTFWD) {
394 if (slirp_hostfwd(s, config->str,
395 config->flags & SLIRP_CFG_LEGACY, errp) < 0) {
396 goto error;
397 }
398 } else {
399 if (slirp_guestfwd(s, config->str,
400 config->flags & SLIRP_CFG_LEGACY, errp) < 0) {
401 goto error;
402 }
403 }
404 }
405#ifndef _WIN32
406 if (!smb_export) {
407 smb_export = legacy_smb_export;
408 }
409 if (smb_export) {
410 if (slirp_smb(s, smb_export, smbsrv, errp) < 0) {
411 goto error;
412 }
413 }
414#endif
415
416 s->exit_notifier.notify = slirp_smb_exit;
417 qemu_add_exit_notifier(&s->exit_notifier);
418 return 0;
419
420error:
421 qemu_del_net_client(nc);
422 return -1;
423}
424
425static SlirpState *slirp_lookup(Monitor *mon, const char *hub_id,
426 const char *name)
427{
428 if (name) {
429 NetClientState *nc;
430 if (hub_id) {
431 nc = net_hub_find_client_by_name(strtol(hub_id, NULL, 0), name);
432 if (!nc) {
433 monitor_printf(mon, "unrecognized (hub-id, stackname) pair\n");
434 return NULL;
435 }
436 } else {
437 nc = qemu_find_netdev(name);
438 if (!nc) {
439 monitor_printf(mon, "unrecognized netdev id '%s'\n", name);
440 return NULL;
441 }
442 }
443 if (strcmp(nc->model, "user")) {
444 monitor_printf(mon, "invalid device specified\n");
445 return NULL;
446 }
447 return DO_UPCAST(SlirpState, nc, nc);
448 } else {
449 if (QTAILQ_EMPTY(&slirp_stacks)) {
450 monitor_printf(mon, "user mode network stack not in use\n");
451 return NULL;
452 }
453 return QTAILQ_FIRST(&slirp_stacks);
454 }
455}
456
457void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict)
458{
459 struct in_addr host_addr = { .s_addr = INADDR_ANY };
460 int host_port;
461 char buf[256];
462 const char *src_str, *p;
463 SlirpState *s;
464 int is_udp = 0;
465 int err;
466 const char *arg1 = qdict_get_str(qdict, "arg1");
467 const char *arg2 = qdict_get_try_str(qdict, "arg2");
468 const char *arg3 = qdict_get_try_str(qdict, "arg3");
469
470 if (arg3) {
471 s = slirp_lookup(mon, arg1, arg2);
472 src_str = arg3;
473 } else if (arg2) {
474 s = slirp_lookup(mon, NULL, arg1);
475 src_str = arg2;
476 } else {
477 s = slirp_lookup(mon, NULL, NULL);
478 src_str = arg1;
479 }
480 if (!s) {
481 return;
482 }
483
484 p = src_str;
485 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
486 goto fail_syntax;
487 }
488
489 if (!strcmp(buf, "tcp") || buf[0] == '\0') {
490 is_udp = 0;
491 } else if (!strcmp(buf, "udp")) {
492 is_udp = 1;
493 } else {
494 goto fail_syntax;
495 }
496
497 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
498 goto fail_syntax;
499 }
500 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
501 goto fail_syntax;
502 }
503
504 if (qemu_strtoi(p, NULL, 10, &host_port)) {
505 goto fail_syntax;
506 }
507
508 err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port);
509
510 monitor_printf(mon, "host forwarding rule for %s %s\n", src_str,
511 err ? "not found" : "removed");
512 return;
513
514 fail_syntax:
515 monitor_printf(mon, "invalid format\n");
516}
517
518static int slirp_hostfwd(SlirpState *s, const char *redir_str,
519 int legacy_format, Error **errp)
520{
521 struct in_addr host_addr = { .s_addr = INADDR_ANY };
522 struct in_addr guest_addr = { .s_addr = 0 };
523 int host_port, guest_port;
524 const char *p;
525 char buf[256];
526 int is_udp;
527 char *end;
528 const char *fail_reason = "Unknown reason";
529
530 p = redir_str;
531 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
532 fail_reason = "No : separators";
533 goto fail_syntax;
534 }
535 if (!strcmp(buf, "tcp") || buf[0] == '\0') {
536 is_udp = 0;
537 } else if (!strcmp(buf, "udp")) {
538 is_udp = 1;
539 } else {
540 fail_reason = "Bad protocol name";
541 goto fail_syntax;
542 }
543
544 if (!legacy_format) {
545 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
546 fail_reason = "Missing : separator";
547 goto fail_syntax;
548 }
549 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
550 fail_reason = "Bad host address";
551 goto fail_syntax;
552 }
553 }
554
555 if (get_str_sep(buf, sizeof(buf), &p, legacy_format ? ':' : '-') < 0) {
556 fail_reason = "Bad host port separator";
557 goto fail_syntax;
558 }
559 host_port = strtol(buf, &end, 0);
560 if (*end != '\0' || host_port < 0 || host_port > 65535) {
561 fail_reason = "Bad host port";
562 goto fail_syntax;
563 }
564
565 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
566 fail_reason = "Missing guest address";
567 goto fail_syntax;
568 }
569 if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) {
570 fail_reason = "Bad guest address";
571 goto fail_syntax;
572 }
573
574 guest_port = strtol(p, &end, 0);
575 if (*end != '\0' || guest_port < 1 || guest_port > 65535) {
576 fail_reason = "Bad guest port";
577 goto fail_syntax;
578 }
579
580 if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr,
581 guest_port) < 0) {
582 error_setg(errp, "Could not set up host forwarding rule '%s'",
583 redir_str);
584 return -1;
585 }
586 return 0;
587
588 fail_syntax:
589 error_setg(errp, "Invalid host forwarding rule '%s' (%s)", redir_str,
590 fail_reason);
591 return -1;
592}
593
594void hmp_hostfwd_add(Monitor *mon, const QDict *qdict)
595{
596 const char *redir_str;
597 SlirpState *s;
598 const char *arg1 = qdict_get_str(qdict, "arg1");
599 const char *arg2 = qdict_get_try_str(qdict, "arg2");
600 const char *arg3 = qdict_get_try_str(qdict, "arg3");
601
602 if (arg3) {
603 s = slirp_lookup(mon, arg1, arg2);
604 redir_str = arg3;
605 } else if (arg2) {
606 s = slirp_lookup(mon, NULL, arg1);
607 redir_str = arg2;
608 } else {
609 s = slirp_lookup(mon, NULL, NULL);
610 redir_str = arg1;
611 }
612 if (s) {
613 Error *err = NULL;
614 if (slirp_hostfwd(s, redir_str, 0, &err) < 0) {
615 error_report_err(err);
616 }
617 }
618
619}
620
621int net_slirp_redir(const char *redir_str)
622{
623 struct slirp_config_str *config;
624 Error *err = NULL;
625 int res;
626
627 if (QTAILQ_EMPTY(&slirp_stacks)) {
628 config = g_malloc(sizeof(*config));
629 pstrcpy(config->str, sizeof(config->str), redir_str);
630 config->flags = SLIRP_CFG_HOSTFWD | SLIRP_CFG_LEGACY;
631 config->next = slirp_configs;
632 slirp_configs = config;
633 return 0;
634 }
635
636 res = slirp_hostfwd(QTAILQ_FIRST(&slirp_stacks), redir_str, 1, &err);
637 if (res < 0) {
638 error_report_err(err);
639 }
640 return res;
641}
642
643#ifndef _WIN32
644
645
646static void slirp_smb_cleanup(SlirpState *s)
647{
648 int ret;
649
650 if (s->smb_dir) {
651 gchar *cmd = g_strdup_printf("rm -rf %s", s->smb_dir);
652 ret = system(cmd);
653 if (ret == -1 || !WIFEXITED(ret)) {
654 error_report("'%s' failed.", cmd);
655 } else if (WEXITSTATUS(ret)) {
656 error_report("'%s' failed. Error code: %d",
657 cmd, WEXITSTATUS(ret));
658 }
659 g_free(cmd);
660 g_free(s->smb_dir);
661 s->smb_dir = NULL;
662 }
663}
664
665static int slirp_smb(SlirpState* s, const char *exported_dir,
666 struct in_addr vserver_addr, Error **errp)
667{
668 char *smb_conf;
669 char *smb_cmdline;
670 struct passwd *passwd;
671 FILE *f;
672
673 passwd = getpwuid(geteuid());
674 if (!passwd) {
675 error_setg(errp, "Failed to retrieve user name");
676 return -1;
677 }
678
679 if (access(CONFIG_SMBD_COMMAND, F_OK)) {
680 error_setg(errp, "Could not find '%s', please install it",
681 CONFIG_SMBD_COMMAND);
682 return -1;
683 }
684
685 if (access(exported_dir, R_OK | X_OK)) {
686 error_setg(errp, "Error accessing shared directory '%s': %s",
687 exported_dir, strerror(errno));
688 return -1;
689 }
690
691 s->smb_dir = g_dir_make_tmp("qemu-smb.XXXXXX", NULL);
692 if (!s->smb_dir) {
693 error_setg(errp, "Could not create samba server dir");
694 return -1;
695 }
696 smb_conf = g_strdup_printf("%s/%s", s->smb_dir, "smb.conf");
697
698 f = fopen(smb_conf, "w");
699 if (!f) {
700 slirp_smb_cleanup(s);
701 error_setg(errp,
702 "Could not create samba server configuration file '%s'",
703 smb_conf);
704 g_free(smb_conf);
705 return -1;
706 }
707 fprintf(f,
708 "[global]\n"
709 "private dir=%s\n"
710 "interfaces=127.0.0.1\n"
711 "bind interfaces only=yes\n"
712 "pid directory=%s\n"
713 "lock directory=%s\n"
714 "state directory=%s\n"
715 "cache directory=%s\n"
716 "ncalrpc dir=%s/ncalrpc\n"
717 "log file=%s/log.smbd\n"
718 "smb passwd file=%s/smbpasswd\n"
719 "security = user\n"
720 "map to guest = Bad User\n"
721 "load printers = no\n"
722 "printing = bsd\n"
723 "disable spoolss = yes\n"
724 "usershare max shares = 0\n"
725 "[qemu]\n"
726 "path=%s\n"
727 "read only=no\n"
728 "guest ok=yes\n"
729 "force user=%s\n",
730 s->smb_dir,
731 s->smb_dir,
732 s->smb_dir,
733 s->smb_dir,
734 s->smb_dir,
735 s->smb_dir,
736 s->smb_dir,
737 s->smb_dir,
738 exported_dir,
739 passwd->pw_name
740 );
741 fclose(f);
742
743 smb_cmdline = g_strdup_printf("%s -l %s -s %s",
744 CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf);
745 g_free(smb_conf);
746
747 if (slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 139) < 0 ||
748 slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 445) < 0) {
749 slirp_smb_cleanup(s);
750 g_free(smb_cmdline);
751 error_setg(errp, "Conflicting/invalid smbserver address");
752 return -1;
753 }
754 g_free(smb_cmdline);
755 return 0;
756}
757
758
759int net_slirp_smb(const char *exported_dir)
760{
761 struct in_addr vserver_addr = { .s_addr = 0 };
762
763 if (legacy_smb_export) {
764 fprintf(stderr, "-smb given twice\n");
765 return -1;
766 }
767 legacy_smb_export = exported_dir;
768 if (!QTAILQ_EMPTY(&slirp_stacks)) {
769 Error *err = NULL;
770 int res = slirp_smb(QTAILQ_FIRST(&slirp_stacks), exported_dir,
771 vserver_addr, &err);
772 if (res < 0) {
773 error_report_err(err);
774 }
775 return res;
776 }
777 return 0;
778}
779
780#endif
781
782struct GuestFwd {
783 CharBackend hd;
784 struct in_addr server;
785 int port;
786 Slirp *slirp;
787};
788
789static int guestfwd_can_read(void *opaque)
790{
791 struct GuestFwd *fwd = opaque;
792 return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port);
793}
794
795static void guestfwd_read(void *opaque, const uint8_t *buf, int size)
796{
797 struct GuestFwd *fwd = opaque;
798 slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size);
799}
800
801static int slirp_guestfwd(SlirpState *s, const char *config_str,
802 int legacy_format, Error **errp)
803{
804 struct in_addr server = { .s_addr = 0 };
805 struct GuestFwd *fwd;
806 const char *p;
807 char buf[128];
808 char *end;
809 int port;
810
811 p = config_str;
812 if (legacy_format) {
813 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
814 goto fail_syntax;
815 }
816 } else {
817 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
818 goto fail_syntax;
819 }
820 if (strcmp(buf, "tcp") && buf[0] != '\0') {
821 goto fail_syntax;
822 }
823 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
824 goto fail_syntax;
825 }
826 if (buf[0] != '\0' && !inet_aton(buf, &server)) {
827 goto fail_syntax;
828 }
829 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
830 goto fail_syntax;
831 }
832 }
833 port = strtol(buf, &end, 10);
834 if (*end != '\0' || port < 1 || port > 65535) {
835 goto fail_syntax;
836 }
837
838 snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port);
839
840 if ((strlen(p) > 4) && !strncmp(p, "cmd:", 4)) {
841 if (slirp_add_exec(s->slirp, 0, &p[4], &server, port) < 0) {
842 error_setg(errp, "Conflicting/invalid host:port in guest "
843 "forwarding rule '%s'", config_str);
844 return -1;
845 }
846 } else {
847 Error *err = NULL;
848 Chardev *chr = qemu_chr_new(buf, p);
849
850 if (!chr) {
851 error_setg(errp, "Could not open guest forwarding device '%s'",
852 buf);
853 return -1;
854 }
855
856 fwd = g_new(struct GuestFwd, 1);
857 qemu_chr_fe_init(&fwd->hd, chr, &err);
858 if (err) {
859 error_propagate(errp, err);
860 g_free(fwd);
861 return -1;
862 }
863
864 if (slirp_add_exec(s->slirp, 3, &fwd->hd, &server, port) < 0) {
865 error_setg(errp, "Conflicting/invalid host:port in guest "
866 "forwarding rule '%s'", config_str);
867 g_free(fwd);
868 return -1;
869 }
870 fwd->server = server;
871 fwd->port = port;
872 fwd->slirp = s->slirp;
873
874 qemu_chr_fe_set_handlers(&fwd->hd, guestfwd_can_read, guestfwd_read,
875 NULL, NULL, fwd, NULL, true);
876 }
877 return 0;
878
879 fail_syntax:
880 error_setg(errp, "Invalid guest forwarding rule '%s'", config_str);
881 return -1;
882}
883
884void hmp_info_usernet(Monitor *mon, const QDict *qdict)
885{
886 SlirpState *s;
887
888 QTAILQ_FOREACH(s, &slirp_stacks, entry) {
889 int id;
890 bool got_hub_id = net_hub_id_for_client(&s->nc, &id) == 0;
891 monitor_printf(mon, "Hub %d (%s):\n",
892 got_hub_id ? id : -1,
893 s->nc.name);
894 slirp_connection_info(s->slirp, mon);
895 }
896}
897
898static void
899net_init_slirp_configs(const StringList *fwd, int flags)
900{
901 while (fwd) {
902 struct slirp_config_str *config;
903
904 config = g_malloc0(sizeof(*config));
905 pstrcpy(config->str, sizeof(config->str), fwd->value->str);
906 config->flags = flags;
907 config->next = slirp_configs;
908 slirp_configs = config;
909
910 fwd = fwd->next;
911 }
912}
913
914static const char **slirp_dnssearch(const StringList *dnsname)
915{
916 const StringList *c = dnsname;
917 size_t i = 0, num_opts = 0;
918 const char **ret;
919
920 while (c) {
921 num_opts++;
922 c = c->next;
923 }
924
925 if (num_opts == 0) {
926 return NULL;
927 }
928
929 ret = g_malloc((num_opts + 1) * sizeof(*ret));
930 c = dnsname;
931 while (c) {
932 ret[i++] = c->value->str;
933 c = c->next;
934 }
935 ret[i] = NULL;
936 return ret;
937}
938
939int net_init_slirp(const Netdev *netdev, const char *name,
940 NetClientState *peer, Error **errp)
941{
942 struct slirp_config_str *config;
943 char *vnet;
944 int ret;
945 const NetdevUserOptions *user;
946 const char **dnssearch;
947 bool ipv4 = true, ipv6 = true;
948
949 assert(netdev->type == NET_CLIENT_DRIVER_USER);
950 user = &netdev->u.user;
951
952 if ((user->has_ipv6 && user->ipv6 && !user->has_ipv4) ||
953 (user->has_ipv4 && !user->ipv4)) {
954 ipv4 = 0;
955 }
956 if ((user->has_ipv4 && user->ipv4 && !user->has_ipv6) ||
957 (user->has_ipv6 && !user->ipv6)) {
958 ipv6 = 0;
959 }
960
961 vnet = user->has_net ? g_strdup(user->net) :
962 user->has_ip ? g_strdup_printf("%s/24", user->ip) :
963 NULL;
964
965 dnssearch = slirp_dnssearch(user->dnssearch);
966
967
968
969 net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD);
970 net_init_slirp_configs(user->guestfwd, 0);
971
972 ret = net_slirp_init(peer, "user", name, user->q_restrict,
973 ipv4, vnet, user->host,
974 ipv6, user->ipv6_prefix, user->ipv6_prefixlen,
975 user->ipv6_host, user->hostname, user->tftp,
976 user->bootfile, user->dhcpstart,
977 user->dns, user->ipv6_dns, user->smb,
978 user->smbserver, dnssearch, user->domainname, errp);
979
980 while (slirp_configs) {
981 config = slirp_configs;
982 slirp_configs = config->next;
983 g_free(config);
984 }
985
986 g_free(vnet);
987 g_free(dnssearch);
988
989 return ret;
990}
991
