slirp/smb: Replace constant strings by glib string
[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 #include "qemu/osdep.h"
25 #include "net/slirp.h"
26
27
28 #ifndef _WIN32
29 #include <pwd.h>
30 #include <sys/wait.h>
31 #endif
32 #include "net/net.h"
33 #include "clients.h"
34 #include "hub.h"
35 #include "monitor/monitor.h"
36 #include "qemu/error-report.h"
37 #include "qemu/sockets.h"
38 #include "slirp/libslirp.h"
39 #include "slirp/ip6.h"
40 #include "sysemu/char.h"
41 #include "sysemu/sysemu.h"
42 #include "qemu/cutils.h"
43 #include "qapi/error.h"
44
45 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
46 {
47 const char *p, *p1;
48 int len;
49 p = *pp;
50 p1 = strchr(p, sep);
51 if (!p1)
52 return -1;
53 len = p1 - p;
54 p1++;
55 if (buf_size > 0) {
56 if (len > buf_size - 1)
57 len = buf_size - 1;
58 memcpy(buf, p, len);
59 buf[len] = '\0';
60 }
61 *pp = p1;
62 return 0;
63 }
64
65 /* slirp network adapter */
66
67 #define SLIRP_CFG_HOSTFWD 1
68 #define SLIRP_CFG_LEGACY 2
69
70 struct slirp_config_str {
71 struct slirp_config_str *next;
72 int flags;
73 char str[1024];
74 int legacy_format;
75 };
76
77 typedef struct SlirpState {
78 NetClientState nc;
79 QTAILQ_ENTRY(SlirpState) entry;
80 Slirp *slirp;
81 Notifier exit_notifier;
82 #ifndef _WIN32
83 gchar *smb_dir;
84 #endif
85 } SlirpState;
86
87 static struct slirp_config_str *slirp_configs;
88 const char *legacy_tftp_prefix;
89 const char *legacy_bootp_filename;
90 static QTAILQ_HEAD(slirp_stacks, SlirpState) slirp_stacks =
91 QTAILQ_HEAD_INITIALIZER(slirp_stacks);
92
93 static int slirp_hostfwd(SlirpState *s, const char *redir_str,
94 int legacy_format);
95 static int slirp_guestfwd(SlirpState *s, const char *config_str,
96 int legacy_format);
97
98 #ifndef _WIN32
99 static const char *legacy_smb_export;
100
101 static int slirp_smb(SlirpState *s, const char *exported_dir,
102 struct in_addr vserver_addr);
103 static void slirp_smb_cleanup(SlirpState *s);
104 #else
105 static inline void slirp_smb_cleanup(SlirpState *s) { }
106 #endif
107
108 void slirp_output(void *opaque, const uint8_t *pkt, int pkt_len)
109 {
110 SlirpState *s = opaque;
111
112 qemu_send_packet(&s->nc, pkt, pkt_len);
113 }
114
115 static ssize_t net_slirp_receive(NetClientState *nc, const uint8_t *buf, size_t size)
116 {
117 SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
118
119 slirp_input(s->slirp, buf, size);
120
121 return size;
122 }
123
124 static void slirp_smb_exit(Notifier *n, void *data)
125 {
126 SlirpState *s = container_of(n, SlirpState, exit_notifier);
127 slirp_smb_cleanup(s);
128 }
129
130 static void net_slirp_cleanup(NetClientState *nc)
131 {
132 SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
133
134 slirp_cleanup(s->slirp);
135 if (s->exit_notifier.notify) {
136 qemu_remove_exit_notifier(&s->exit_notifier);
137 }
138 slirp_smb_cleanup(s);
139 QTAILQ_REMOVE(&slirp_stacks, s, entry);
140 }
141
142 static NetClientInfo net_slirp_info = {
143 .type = NET_CLIENT_DRIVER_USER,
144 .size = sizeof(SlirpState),
145 .receive = net_slirp_receive,
146 .cleanup = net_slirp_cleanup,
147 };
148
149 static int net_slirp_init(NetClientState *peer, const char *model,
150 const char *name, int restricted,
151 bool ipv4, const char *vnetwork, const char *vhost,
152 bool ipv6, const char *vprefix6, int vprefix6_len,
153 const char *vhost6,
154 const char *vhostname, const char *tftp_export,
155 const char *bootfile, const char *vdhcp_start,
156 const char *vnameserver, const char *vnameserver6,
157 const char *smb_export, const char *vsmbserver,
158 const char **dnssearch)
159 {
160 /* default settings according to historic slirp */
161 struct in_addr net = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */
162 struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */
163 struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */
164 struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */
165 struct in_addr dns = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */
166 struct in6_addr ip6_prefix;
167 struct in6_addr ip6_host;
168 struct in6_addr ip6_dns;
169 #ifndef _WIN32
170 struct in_addr smbsrv = { .s_addr = 0 };
171 #endif
172 NetClientState *nc;
173 SlirpState *s;
174 char buf[20];
175 uint32_t addr;
176 int shift;
177 char *end;
178 struct slirp_config_str *config;
179
180 if (!ipv4 && (vnetwork || vhost || vnameserver)) {
181 return -1;
182 }
183
184 if (!ipv6 && (vprefix6 || vhost6 || vnameserver6)) {
185 return -1;
186 }
187
188 if (!ipv4 && !ipv6) {
189 /* It doesn't make sense to disable both */
190 return -1;
191 }
192
193 if (!tftp_export) {
194 tftp_export = legacy_tftp_prefix;
195 }
196 if (!bootfile) {
197 bootfile = legacy_bootp_filename;
198 }
199
200 if (vnetwork) {
201 if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) {
202 if (!inet_aton(vnetwork, &net)) {
203 return -1;
204 }
205 addr = ntohl(net.s_addr);
206 if (!(addr & 0x80000000)) {
207 mask.s_addr = htonl(0xff000000); /* class A */
208 } else if ((addr & 0xfff00000) == 0xac100000) {
209 mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */
210 } else if ((addr & 0xc0000000) == 0x80000000) {
211 mask.s_addr = htonl(0xffff0000); /* class B */
212 } else if ((addr & 0xffff0000) == 0xc0a80000) {
213 mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */
214 } else if ((addr & 0xffff0000) == 0xc6120000) {
215 mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */
216 } else if ((addr & 0xe0000000) == 0xe0000000) {
217 mask.s_addr = htonl(0xffffff00); /* class C */
218 } else {
219 mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */
220 }
221 } else {
222 if (!inet_aton(buf, &net)) {
223 return -1;
224 }
225 shift = strtol(vnetwork, &end, 10);
226 if (*end != '\0') {
227 if (!inet_aton(vnetwork, &mask)) {
228 return -1;
229 }
230 } else if (shift < 4 || shift > 32) {
231 return -1;
232 } else {
233 mask.s_addr = htonl(0xffffffff << (32 - shift));
234 }
235 }
236 net.s_addr &= mask.s_addr;
237 host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr);
238 dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr);
239 dns.s_addr = net.s_addr | (htonl(0x0203) & ~mask.s_addr);
240 }
241
242 if (vhost && !inet_aton(vhost, &host)) {
243 return -1;
244 }
245 if ((host.s_addr & mask.s_addr) != net.s_addr) {
246 return -1;
247 }
248
249 if (vnameserver && !inet_aton(vnameserver, &dns)) {
250 return -1;
251 }
252 if ((dns.s_addr & mask.s_addr) != net.s_addr ||
253 dns.s_addr == host.s_addr) {
254 return -1;
255 }
256
257 if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) {
258 return -1;
259 }
260 if ((dhcp.s_addr & mask.s_addr) != net.s_addr ||
261 dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) {
262 return -1;
263 }
264
265 #ifndef _WIN32
266 if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) {
267 return -1;
268 }
269 #endif
270
271 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
272 /* No inet_pton helper before Vista... */
273 if (vprefix6) {
274 /* Unsupported */
275 return -1;
276 }
277 memset(&ip6_prefix, 0, sizeof(ip6_prefix));
278 ip6_prefix.s6_addr[0] = 0xfe;
279 ip6_prefix.s6_addr[1] = 0xc0;
280 #else
281 if (!vprefix6) {
282 vprefix6 = "fec0::";
283 }
284 if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) {
285 return -1;
286 }
287 #endif
288
289 if (!vprefix6_len) {
290 vprefix6_len = 64;
291 }
292 if (vprefix6_len < 0 || vprefix6_len > 126) {
293 return -1;
294 }
295
296 if (vhost6) {
297 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
298 return -1;
299 #else
300 if (!inet_pton(AF_INET6, vhost6, &ip6_host)) {
301 return -1;
302 }
303 if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) {
304 return -1;
305 }
306 #endif
307 } else {
308 ip6_host = ip6_prefix;
309 ip6_host.s6_addr[15] |= 2;
310 }
311
312 if (vnameserver6) {
313 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
314 return -1;
315 #else
316 if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) {
317 return -1;
318 }
319 if (!in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) {
320 return -1;
321 }
322 #endif
323 } else {
324 ip6_dns = ip6_prefix;
325 ip6_dns.s6_addr[15] |= 3;
326 }
327
328
329 nc = qemu_new_net_client(&net_slirp_info, peer, model, name);
330
331 snprintf(nc->info_str, sizeof(nc->info_str),
332 "net=%s,restrict=%s", inet_ntoa(net),
333 restricted ? "on" : "off");
334
335 s = DO_UPCAST(SlirpState, nc, nc);
336
337 s->slirp = slirp_init(restricted, ipv4, net, mask, host,
338 ipv6, ip6_prefix, vprefix6_len, ip6_host,
339 vhostname, tftp_export, bootfile, dhcp,
340 dns, ip6_dns, dnssearch, s);
341 QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry);
342
343 for (config = slirp_configs; config; config = config->next) {
344 if (config->flags & SLIRP_CFG_HOSTFWD) {
345 if (slirp_hostfwd(s, config->str,
346 config->flags & SLIRP_CFG_LEGACY) < 0)
347 goto error;
348 } else {
349 if (slirp_guestfwd(s, config->str,
350 config->flags & SLIRP_CFG_LEGACY) < 0)
351 goto error;
352 }
353 }
354 #ifndef _WIN32
355 if (!smb_export) {
356 smb_export = legacy_smb_export;
357 }
358 if (smb_export) {
359 if (slirp_smb(s, smb_export, smbsrv) < 0)
360 goto error;
361 }
362 #endif
363
364 s->exit_notifier.notify = slirp_smb_exit;
365 qemu_add_exit_notifier(&s->exit_notifier);
366 return 0;
367
368 error:
369 qemu_del_net_client(nc);
370 return -1;
371 }
372
373 static SlirpState *slirp_lookup(Monitor *mon, const char *vlan,
374 const char *stack)
375 {
376
377 if (vlan) {
378 NetClientState *nc;
379 nc = net_hub_find_client_by_name(strtol(vlan, NULL, 0), stack);
380 if (!nc) {
381 monitor_printf(mon, "unrecognized (vlan-id, stackname) pair\n");
382 return NULL;
383 }
384 if (strcmp(nc->model, "user")) {
385 monitor_printf(mon, "invalid device specified\n");
386 return NULL;
387 }
388 return DO_UPCAST(SlirpState, nc, nc);
389 } else {
390 if (QTAILQ_EMPTY(&slirp_stacks)) {
391 monitor_printf(mon, "user mode network stack not in use\n");
392 return NULL;
393 }
394 return QTAILQ_FIRST(&slirp_stacks);
395 }
396 }
397
398 void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict)
399 {
400 struct in_addr host_addr = { .s_addr = INADDR_ANY };
401 int host_port;
402 char buf[256];
403 const char *src_str, *p;
404 SlirpState *s;
405 int is_udp = 0;
406 int err;
407 const char *arg1 = qdict_get_str(qdict, "arg1");
408 const char *arg2 = qdict_get_try_str(qdict, "arg2");
409 const char *arg3 = qdict_get_try_str(qdict, "arg3");
410
411 if (arg2) {
412 s = slirp_lookup(mon, arg1, arg2);
413 src_str = arg3;
414 } else {
415 s = slirp_lookup(mon, NULL, NULL);
416 src_str = arg1;
417 }
418 if (!s) {
419 return;
420 }
421
422 p = src_str;
423 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
424 goto fail_syntax;
425 }
426
427 if (!strcmp(buf, "tcp") || buf[0] == '\0') {
428 is_udp = 0;
429 } else if (!strcmp(buf, "udp")) {
430 is_udp = 1;
431 } else {
432 goto fail_syntax;
433 }
434
435 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
436 goto fail_syntax;
437 }
438 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
439 goto fail_syntax;
440 }
441
442 host_port = atoi(p);
443
444 err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port);
445
446 monitor_printf(mon, "host forwarding rule for %s %s\n", src_str,
447 err ? "not found" : "removed");
448 return;
449
450 fail_syntax:
451 monitor_printf(mon, "invalid format\n");
452 }
453
454 static int slirp_hostfwd(SlirpState *s, const char *redir_str,
455 int legacy_format)
456 {
457 struct in_addr host_addr = { .s_addr = INADDR_ANY };
458 struct in_addr guest_addr = { .s_addr = 0 };
459 int host_port, guest_port;
460 const char *p;
461 char buf[256];
462 int is_udp;
463 char *end;
464
465 p = redir_str;
466 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
467 goto fail_syntax;
468 }
469 if (!strcmp(buf, "tcp") || buf[0] == '\0') {
470 is_udp = 0;
471 } else if (!strcmp(buf, "udp")) {
472 is_udp = 1;
473 } else {
474 goto fail_syntax;
475 }
476
477 if (!legacy_format) {
478 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
479 goto fail_syntax;
480 }
481 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
482 goto fail_syntax;
483 }
484 }
485
486 if (get_str_sep(buf, sizeof(buf), &p, legacy_format ? ':' : '-') < 0) {
487 goto fail_syntax;
488 }
489 host_port = strtol(buf, &end, 0);
490 if (*end != '\0' || host_port < 0 || host_port > 65535) {
491 goto fail_syntax;
492 }
493
494 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
495 goto fail_syntax;
496 }
497 if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) {
498 goto fail_syntax;
499 }
500
501 guest_port = strtol(p, &end, 0);
502 if (*end != '\0' || guest_port < 1 || guest_port > 65535) {
503 goto fail_syntax;
504 }
505
506 if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr,
507 guest_port) < 0) {
508 error_report("could not set up host forwarding rule '%s'",
509 redir_str);
510 return -1;
511 }
512 return 0;
513
514 fail_syntax:
515 error_report("invalid host forwarding rule '%s'", redir_str);
516 return -1;
517 }
518
519 void hmp_hostfwd_add(Monitor *mon, const QDict *qdict)
520 {
521 const char *redir_str;
522 SlirpState *s;
523 const char *arg1 = qdict_get_str(qdict, "arg1");
524 const char *arg2 = qdict_get_try_str(qdict, "arg2");
525 const char *arg3 = qdict_get_try_str(qdict, "arg3");
526
527 if (arg2) {
528 s = slirp_lookup(mon, arg1, arg2);
529 redir_str = arg3;
530 } else {
531 s = slirp_lookup(mon, NULL, NULL);
532 redir_str = arg1;
533 }
534 if (s) {
535 slirp_hostfwd(s, redir_str, 0);
536 }
537
538 }
539
540 int net_slirp_redir(const char *redir_str)
541 {
542 struct slirp_config_str *config;
543
544 if (QTAILQ_EMPTY(&slirp_stacks)) {
545 config = g_malloc(sizeof(*config));
546 pstrcpy(config->str, sizeof(config->str), redir_str);
547 config->flags = SLIRP_CFG_HOSTFWD | SLIRP_CFG_LEGACY;
548 config->next = slirp_configs;
549 slirp_configs = config;
550 return 0;
551 }
552
553 return slirp_hostfwd(QTAILQ_FIRST(&slirp_stacks), redir_str, 1);
554 }
555
556 #ifndef _WIN32
557
558 /* automatic user mode samba server configuration */
559 static void slirp_smb_cleanup(SlirpState *s)
560 {
561 int ret;
562
563 if (s->smb_dir) {
564 gchar *cmd = g_strdup_printf("rm -rf %s", s->smb_dir);
565 ret = system(cmd);
566 if (ret == -1 || !WIFEXITED(ret)) {
567 error_report("'%s' failed.", cmd);
568 } else if (WEXITSTATUS(ret)) {
569 error_report("'%s' failed. Error code: %d",
570 cmd, WEXITSTATUS(ret));
571 }
572 g_free(cmd);
573 g_free(s->smb_dir);
574 s->smb_dir = NULL;
575 }
576 }
577
578 static int slirp_smb(SlirpState* s, const char *exported_dir,
579 struct in_addr vserver_addr)
580 {
581 char *smb_conf;
582 char *smb_cmdline;
583 struct passwd *passwd;
584 FILE *f;
585
586 passwd = getpwuid(geteuid());
587 if (!passwd) {
588 error_report("failed to retrieve user name");
589 return -1;
590 }
591
592 if (access(CONFIG_SMBD_COMMAND, F_OK)) {
593 error_report("could not find '%s', please install it",
594 CONFIG_SMBD_COMMAND);
595 return -1;
596 }
597
598 if (access(exported_dir, R_OK | X_OK)) {
599 error_report("error accessing shared directory '%s': %s",
600 exported_dir, strerror(errno));
601 return -1;
602 }
603
604 s->smb_dir = g_dir_make_tmp("qemu-smb.XXXXXX", NULL);
605 if (!s->smb_dir) {
606 error_report("could not create samba server dir");
607 return -1;
608 }
609 smb_conf = g_strdup_printf("%s/%s", s->smb_dir, "smb.conf");
610
611 f = fopen(smb_conf, "w");
612 if (!f) {
613 slirp_smb_cleanup(s);
614 error_report("could not create samba server configuration file '%s'",
615 smb_conf);
616 g_free(smb_conf);
617 return -1;
618 }
619 fprintf(f,
620 "[global]\n"
621 "private dir=%s\n"
622 "interfaces=127.0.0.1\n"
623 "bind interfaces only=yes\n"
624 "pid directory=%s\n"
625 "lock directory=%s\n"
626 "state directory=%s\n"
627 "cache directory=%s\n"
628 "ncalrpc dir=%s/ncalrpc\n"
629 "log file=%s/log.smbd\n"
630 "smb passwd file=%s/smbpasswd\n"
631 "security = user\n"
632 "map to guest = Bad User\n"
633 "load printers = no\n"
634 "printing = bsd\n"
635 "disable spoolss = yes\n"
636 "usershare max shares = 0\n"
637 "[qemu]\n"
638 "path=%s\n"
639 "read only=no\n"
640 "guest ok=yes\n"
641 "force user=%s\n",
642 s->smb_dir,
643 s->smb_dir,
644 s->smb_dir,
645 s->smb_dir,
646 s->smb_dir,
647 s->smb_dir,
648 s->smb_dir,
649 s->smb_dir,
650 exported_dir,
651 passwd->pw_name
652 );
653 fclose(f);
654
655 smb_cmdline = g_strdup_printf("%s -l %s -s %s",
656 CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf);
657 g_free(smb_conf);
658
659 if (slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 139) < 0 ||
660 slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 445) < 0) {
661 slirp_smb_cleanup(s);
662 g_free(smb_cmdline);
663 error_report("conflicting/invalid smbserver address");
664 return -1;
665 }
666 g_free(smb_cmdline);
667 return 0;
668 }
669
670 /* automatic user mode samba server configuration (legacy interface) */
671 int net_slirp_smb(const char *exported_dir)
672 {
673 struct in_addr vserver_addr = { .s_addr = 0 };
674
675 if (legacy_smb_export) {
676 fprintf(stderr, "-smb given twice\n");
677 return -1;
678 }
679 legacy_smb_export = exported_dir;
680 if (!QTAILQ_EMPTY(&slirp_stacks)) {
681 return slirp_smb(QTAILQ_FIRST(&slirp_stacks), exported_dir,
682 vserver_addr);
683 }
684 return 0;
685 }
686
687 #endif /* !defined(_WIN32) */
688
689 struct GuestFwd {
690 CharBackend hd;
691 struct in_addr server;
692 int port;
693 Slirp *slirp;
694 };
695
696 static int guestfwd_can_read(void *opaque)
697 {
698 struct GuestFwd *fwd = opaque;
699 return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port);
700 }
701
702 static void guestfwd_read(void *opaque, const uint8_t *buf, int size)
703 {
704 struct GuestFwd *fwd = opaque;
705 slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size);
706 }
707
708 static int slirp_guestfwd(SlirpState *s, const char *config_str,
709 int legacy_format)
710 {
711 struct in_addr server = { .s_addr = 0 };
712 struct GuestFwd *fwd;
713 const char *p;
714 char buf[128];
715 char *end;
716 int port;
717
718 p = config_str;
719 if (legacy_format) {
720 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
721 goto fail_syntax;
722 }
723 } else {
724 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
725 goto fail_syntax;
726 }
727 if (strcmp(buf, "tcp") && buf[0] != '\0') {
728 goto fail_syntax;
729 }
730 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
731 goto fail_syntax;
732 }
733 if (buf[0] != '\0' && !inet_aton(buf, &server)) {
734 goto fail_syntax;
735 }
736 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
737 goto fail_syntax;
738 }
739 }
740 port = strtol(buf, &end, 10);
741 if (*end != '\0' || port < 1 || port > 65535) {
742 goto fail_syntax;
743 }
744
745 snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port);
746
747 if ((strlen(p) > 4) && !strncmp(p, "cmd:", 4)) {
748 if (slirp_add_exec(s->slirp, 0, &p[4], &server, port) < 0) {
749 error_report("conflicting/invalid host:port in guest forwarding "
750 "rule '%s'", config_str);
751 return -1;
752 }
753 } else {
754 Error *err = NULL;
755 Chardev *chr = qemu_chr_new(buf, p);
756
757 if (!chr) {
758 error_report("could not open guest forwarding device '%s'", buf);
759 return -1;
760 }
761
762 fwd = g_new(struct GuestFwd, 1);
763 qemu_chr_fe_init(&fwd->hd, chr, &err);
764 if (err) {
765 error_report_err(err);
766 g_free(fwd);
767 return -1;
768 }
769
770 if (slirp_add_exec(s->slirp, 3, &fwd->hd, &server, port) < 0) {
771 error_report("conflicting/invalid host:port in guest forwarding "
772 "rule '%s'", config_str);
773 g_free(fwd);
774 return -1;
775 }
776 fwd->server = server;
777 fwd->port = port;
778 fwd->slirp = s->slirp;
779
780 qemu_chr_fe_set_handlers(&fwd->hd, guestfwd_can_read, guestfwd_read,
781 NULL, fwd, NULL, true);
782 }
783 return 0;
784
785 fail_syntax:
786 error_report("invalid guest forwarding rule '%s'", config_str);
787 return -1;
788 }
789
790 void hmp_info_usernet(Monitor *mon, const QDict *qdict)
791 {
792 SlirpState *s;
793
794 QTAILQ_FOREACH(s, &slirp_stacks, entry) {
795 int id;
796 bool got_vlan_id = net_hub_id_for_client(&s->nc, &id) == 0;
797 monitor_printf(mon, "VLAN %d (%s):\n",
798 got_vlan_id ? id : -1,
799 s->nc.name);
800 slirp_connection_info(s->slirp, mon);
801 }
802 }
803
804 static void
805 net_init_slirp_configs(const StringList *fwd, int flags)
806 {
807 while (fwd) {
808 struct slirp_config_str *config;
809
810 config = g_malloc0(sizeof(*config));
811 pstrcpy(config->str, sizeof(config->str), fwd->value->str);
812 config->flags = flags;
813 config->next = slirp_configs;
814 slirp_configs = config;
815
816 fwd = fwd->next;
817 }
818 }
819
820 static const char **slirp_dnssearch(const StringList *dnsname)
821 {
822 const StringList *c = dnsname;
823 size_t i = 0, num_opts = 0;
824 const char **ret;
825
826 while (c) {
827 num_opts++;
828 c = c->next;
829 }
830
831 if (num_opts == 0) {
832 return NULL;
833 }
834
835 ret = g_malloc((num_opts + 1) * sizeof(*ret));
836 c = dnsname;
837 while (c) {
838 ret[i++] = c->value->str;
839 c = c->next;
840 }
841 ret[i] = NULL;
842 return ret;
843 }
844
845 int net_init_slirp(const Netdev *netdev, const char *name,
846 NetClientState *peer, Error **errp)
847 {
848 /* FIXME error_setg(errp, ...) on failure */
849 struct slirp_config_str *config;
850 char *vnet;
851 int ret;
852 const NetdevUserOptions *user;
853 const char **dnssearch;
854 bool ipv4 = true, ipv6 = true;
855
856 assert(netdev->type == NET_CLIENT_DRIVER_USER);
857 user = &netdev->u.user;
858
859 if ((user->has_ipv6 && user->ipv6 && !user->has_ipv4) ||
860 (user->has_ipv4 && !user->ipv4)) {
861 ipv4 = 0;
862 }
863 if ((user->has_ipv4 && user->ipv4 && !user->has_ipv6) ||
864 (user->has_ipv6 && !user->ipv6)) {
865 ipv6 = 0;
866 }
867
868 vnet = user->has_net ? g_strdup(user->net) :
869 user->has_ip ? g_strdup_printf("%s/24", user->ip) :
870 NULL;
871
872 dnssearch = slirp_dnssearch(user->dnssearch);
873
874 /* all optional fields are initialized to "all bits zero" */
875
876 net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD);
877 net_init_slirp_configs(user->guestfwd, 0);
878
879 ret = net_slirp_init(peer, "user", name, user->q_restrict,
880 ipv4, vnet, user->host,
881 ipv6, user->ipv6_prefix, user->ipv6_prefixlen,
882 user->ipv6_host, user->hostname, user->tftp,
883 user->bootfile, user->dhcpstart,
884 user->dns, user->ipv6_dns, user->smb,
885 user->smbserver, dnssearch);
886
887 while (slirp_configs) {
888 config = slirp_configs;
889 slirp_configs = config->next;
890 g_free(config);
891 }
892
893 g_free(vnet);
894 g_free(dnssearch);
895
896 return ret;
897 }
898
899 int net_slirp_parse_legacy(QemuOptsList *opts_list, const char *optarg, int *ret)
900 {
901 if (strcmp(opts_list->name, "net") != 0 ||
902 strncmp(optarg, "channel,", strlen("channel,")) != 0) {
903 return 0;
904 }
905
906 error_report("The '-net channel' option is deprecated. "
907 "Please use '-netdev user,guestfwd=...' instead.");
908
909 /* handle legacy -net channel,port:chr */
910 optarg += strlen("channel,");
911
912 if (QTAILQ_EMPTY(&slirp_stacks)) {
913 struct slirp_config_str *config;
914
915 config = g_malloc(sizeof(*config));
916 pstrcpy(config->str, sizeof(config->str), optarg);
917 config->flags = SLIRP_CFG_LEGACY;
918 config->next = slirp_configs;
919 slirp_configs = config;
920 *ret = 0;
921 } else {
922 *ret = slirp_guestfwd(QTAILQ_FIRST(&slirp_stacks), optarg, 1);
923 }
924
925 return 1;
926 }
927